Zero-current detecting circuit and DC converter

The invention provides a zero-current detecting circuit. The zero-current detecting circuit comprises a first current mirror coupled to two transistors, the first transistor is coupled to a grounding end through a first resistor, and the second transistor is coupled to a detection node through a second resistor. The output of the first transistor is coupled to the negative input end of a first comparator, and the output of the second transistor is coupled to the positive input end of the first comparator. When the voltage level of the positive input end of the first comparator is greater than the voltage level of the negative input end of the first comparator, the first comparator outputs a predetermined signal to indicate appearance of zero currents of the detection node.

Automatic quality inspection equipment for valve element seat of throttle valve

The automatic quality inspection equipment comprises a final assembly table, a feeding module used for providing a valve element base to be detected is arranged on the final assembly table, and a detection module used for detecting hole sites and burrs of the valve element base is arranged on the right side of the feeding module; according to the valve element seat hole position and burr quality inspection device, through the shielding effect of hole walls on light and the blocking effect of burrs on an aluminum probe rod, quality inspection of valve element seat hole positions and burrs is fully automatically achieved, the overall structure is convenient to install, the detection efficiency is high, and the detection efficiency is high. Cost is low, labor cost can be saved, detection stability and efficiency are high, and detection accuracy is high.

Pipeline cable laying device and laying pipeline

The invention belongs to the field of cable construction devices, and particularly relates to a pipeline cable laying device which comprises a moving assembly, a power assembly and a hoop assembly, and is characterized in that the moving assembly is formed by arranging a front arc-shaped rod and a rear arc-shaped rod which are the same in shape in parallel at intervals and fixedly connecting the front arc-shaped rod and the rear arc-shaped rod through a connecting rod; the middle of the front arc-shaped rod and the middle of the rear arc-shaped rod are each provided with an upper front wheel, the two ends of the front arc-shaped rod and the two ends of the rear arc-shaped rod are each provided with a lower front wheel, the power assembly is fixed below the front arc-shaped rod and the rear arc-shaped rod and drives the upper rear wheels to rotate through a motor, and the hoop body is fixed to the power assembly. The device has the beneficial effects of being simple in structure, convenient ...

Cultivation method for turmeric

The invention discloses a cultivation method for turmeric. The method comprises the following steps: (1) germination acceleration and sowing; (2) soil preparation and sowing; (3) field management; and (4) timely harvesting. According to the cultivation method for turmeric in the invention, turmeric seed tubers are subjected to sterilization and seed dressing according to local environmental climate and soil environment of Shucheng, so bacterium resistance and disease resistance of turmeric plants are effectively improved, the seed tubers are protected and growth intensity of the turmeric plants is enhanced; and an added soil conditioner can effectively improve soil quality, enhances adaptivity of the turmeric plants to soil and guarantees sound and quick growth of the turmeric plants.

Single excitation ultrasonic elliptic vibration multi-vibrator bidirectional material conveying device

The invention discloses a single excitation ultrasonic elliptic vibration multi-vibrator bidirectional material conveying device which is mainly used for accurately and precisely conveying strip-shaped materials. The device is characterized in that a plurality of vibrators are adopted as excitation vibration bodies, divided into two groups and alternatively and oppositely arranged; each vibrator comprises an ultrasonic vibration transducer, an elliptic vibration mode converter and friction drive blocks arranged at the front end of the elliptic vibration mode converter; the ultrasonic vibration transducer comprises a bolt as well as a rear cover plate, a piezoelectric ceramic piece, electrode plates and a front cover plate which sleeve the bolt in sequence; the rear cover plate, the piezoelectric ceramic piece, the electrode plates and the front cover plate are connected and compressed through the bolt; the elliptic vibration mode converter is arranged at the front end of the ultrasonic ...

Signal detection position detection method and device and computer equipment

The invention relates to a signal detection position detection method and device, computer equipment, a storage medium and a computer program product. The method comprises the steps that a current detection position is detected through an ultrasonic wave physiological signal meter probe, and a to-be-detected sound signal corresponding to the current detection position is obtained; performing digital signal processing on the to-be-detected sound signal to obtain a two-dimensional audio feature of the to-be-detected sound signal; inputting the two-dimensional audio features of the to-be-detected sound signal into the trained sound signal classification model, outputting a probability value that the to-be-detected sound signal is classified into each preset sound signal type, and determining the signal type of the to-be-detected sound signal according to the probability value; and under the condition that the signal type is the target signal type, determining that the current detection position ...

Sprout-inhibiting active compound, preparation method thereof and applications of the sprout-inhibiting active compound in sprout inhibition

The invention mainly obtains a compound having sprout-inhibiting activity from extract of a malignant invasive weed 'crofton weed'. The compound is a plant sprout inhibiting agent used for the fields of storage, preservation, weed control, sprouting inhibition, chemical topping, and the like. Extraction, separation and activity tracking are combined in the technology provided by the invention. The technology includes crude extraction of crofton weed powder by ethanol, redissolution of ethanol extract by water having a certain temperature, digestion with ethyl acetate and purification. Natural products derived from the 'crofton weed' are manufactured into a plant-source pesticide. The specification mainly expounds that the sprout-inhibiting active compound can reduce economic loss caused by sprouting, water loss, disease, etc. in storage processes of tubers. The active compound can be applied for prolonging the storage period of the tubers. The active compound is low in production cost and ...

Voltage converter

The invention relates to an electric pressure converter which comprises a pulse-width modulation control chip, an upper bridge transistor, a lower bridge transistor and a low pass filter; wherein, the pulse-width modulation control chip is provided with a boot pin, a phase pin, a ugate pin, a lgate pin, a Vcc pin and a GND pin; the pulse-width modulation control chip works to drive the upper bridge transistor and the lower bridge transistor through the pins; the pulse-width modulation control chip utilizes the phase pin be taken as a multifunctional pin, thus realizing various extended functions such as overcurrent protection, reverse current control, light load efficiency improvement, etc. The pulse-width modulation control chip of the electric pressure converter is not needed to be additionally provided with the multifunctional pin. Therefore, fewer pins are available on the pulse-width modulation control chip, and the size can be further reduced, thus the invention is suitable for the ...

Noise reduction floater type one-way valve

The invention relates to the technical field of one-way valves, and particularly discloses a noise reduction floater type one-way valve. According to the main technical scheme, the noise reduction floater type one-way valve at least comprises a valve body, a valve seat and a valve element, and the valve body comprises a valve cavity; the valve seat comprises a valve seat body, an anti-rotation part extending from one end of the valve seat body to one side of the valve element and a baffle ring part connected to the other end of the anti-rotation part. The anti-rotation part is provided with at least one guide groove. The valve element is provided with at least one edge part extending towards one side of the baffle ring part, the edge parts are located in the guide grooves of the anti-rotation part, and the edge parts are located in the guide grooves of the anti-rotation part all the time in the axial moving stroke of the valve element. The floater type one-way valve of the structure can ...

Process for surface treatment of internal wall of open-end spinning frame rotor

The invention relates to a process for strengthening abrasive resistance of an internal surface of an open-end spinning frame rotor, with the purposes of effectively improving the internal surface hardness and prolonging the service life of the rotor and characteristics of convenience for operation and favorable economic performance. The technical scheme is as follows: the process for surface treatment of internal walls of the open-end spinning frame rotor comprises the following steps of: (1) machining to control the roughnesses of a glide plane and a collecting groove at Ra0.7-0.9; quenching the rotor by heating to 800-900 DEG C at the intermediate speed of 15-25 DEG C/min, keeping for 15-25min and cooling in water of 20DEG C to the ambient temperature; (3) then carrying out lower tempering treatment by heating to 220-240 DEG C at the intermediate speed of 15-25 DEG C/min, keeping for 12-18min, and then cooling in air to the ambient temperature; and (4) carrying out chemical nickel-plating ...

Handle device that is fit for underwater robot operation

The utility model discloses an it when putting, needs the manipulator of underwater robot to go to accomplish relevant release and drag the device of operation carrying out seabed cloth to be applied to seabed observation platform, specifically is a handle device that is fit for underwater robot operation. The utility model discloses a handle, articulate the protector, take spring leaf, socket, the spacing bolt of semicircle ball, the socket fixing is on the observation platform under water in seabed is put to need cloth, the handle takes the spring leaf card of semicircle ball to go into the slope form draw -in groove on the socket on inserting the socket, the spring leaf of taking the semicircle ball adopts the welding mode to link to each other with the handle, the direction spacing groove of handle is corresponding with the spacing bolt on the socket, it installs in the handle rear end to articulate the protector. The utility model has the advantages that the manipulator that can be ...

Intelligent controller and intelligent control system thereof

The invention relates to an intelligent controller and an intelligent control system thereof, and the intelligent controller is used for controlling a lifting device, and is also used for receiving a control instruction of a mobile terminal and carrying out data interaction with the mobile terminal; the intelligent controller comprises two parts, namely a first controller and a second controller; wherein the first controller is used for processing various types of data in the control process of the lifting device and controlling the operation state of the lifting table; the method is suitable for occasions where a large number of users and room lifting tables are used, user customized lifting and decoupling among the rooms, the lifting tables and the users can be rapidly achieved, and the method is high in stability, user-friendly and intelligent.

Food with appearance of aqueous livings and producing method

Astragalus sinicus cultivation method

The invention discloses an astragalus sinicus cultivation method which comprises seed treatment, seeding, field management and harvesting at proper time, wherein during the seed treatment stage, a rice mill is adopted for milling so as to remove waxy substances on seed hulls, then the hulled seeds are soaked in a treating agent so as to achieve a sterilization and bacteriostasis effect, the hulled seeds are soaked in a nutrient solution so as to improve the medical value of plants, and finally, modified soil is mixed with seeds so as to achieve effects of nitrogen fixation and protection; a soil improvement agent is used for improvement, so that the adaptability of astragalus sinicus to soil is enhanced and the healthy growth of astragalus sinicus is ensured. The method disclosed by the invention can be used for effectively reducing the disease prevention rate of the plants and improving the yield.

Method for graphical micro-manufacturing of curve surface film by utilizing flexible photolithographic template

The invention provides a method for graphical micro-manufacturing of a curve surface film method by utilizing a flexible photolithographic template, belonging to the technical field of micro processing. The technique is characterized by comprising the following steps: coating the graphical surface of the flexible elastic mold with a corrosion solvent, then attaching the graphical surface to a to-be-etched film, etching the surface of the film in contact with the bulged graphical part of the elastic mold, and removing the elastic mold after etching the film so as to obtain a to-be-etched pattern structure. According to the invention, because the elastic mold is used for replacing a hard mold used in photolithography, compared with the traditional photolithographic technique, the flexible photolithographic technique has the advantages that more flexibility is realized, firstly, a complex three-dimensional structure can be manufactured and can be applied to a curved surface; secondly, the ...

Potato seed storage method

The invention provides a potato seed storage method, which comprises the following steps: selecting potato seeds with uniform size; using 1 to 16 mg/l of uniconazole to soak the potato seeds for 15 to 30 min; and storing the potato seeds under the condition of 18 to 20 DEG C after the moisture is dried. The method prolongs the storage period of the potatoes, and can also regulate and control the storage period of the potatoes so that the dormancy can be fast broken when the potatoes needs to sprout, and strong and healthy seedlings are sprouted. The method has simple operation, and is suitable for wide popularization and application.

Structurally improved main mechanism of instrument for car

The utility model relates to a Vehicle instrument meter core, which is an improved structure. The utility model comprises a casing made from non permeability magnetic material, a magnetic shield device which is contacted on the inner wall of the casing and is composed of long bar-shaped metal permeability sheets which are wound into a plurality of layers. A winding seat arranged in a close shielding device, a copper winding wound on the winding seat, and a high permeability magnetic intensity magnetic core arranged and sealed in the oil contain chamber of the winding seat. A fine shaft is arranged at the center of the magnetic core, and a pointer is fixed on one end of the fine shaft and is penetrated out of the oil contain chamber. The magnetic core adopts high strong material, and the permeability magnetic strength of the utility model is 3 or 4 times higher than a magnetic core. The utility model can effectively reduce the number of copper windings and the integration volume of the utility ...

Glass welding method for coupling femtosecond laser with low-flux CO2 laser

The invention belongs to the field of glass welding, and particularly relates to a femtosecond laser and low-flux CO2 laser coupled glass welding method. Comprising the following steps that (1) two pieces of transparent glass to be welded are selected, and the transparent glass is clamped through a clamp after being pretreated, so that the to-be-welded surfaces of the transparent glass are in contact; (2) femtosecond laser with the wavelength ranging from 500 nm to 50000 nm and the power ranging from 10 W to 40 W is adopted, and the face to be welded is welded according to a set path and parameter scanning; and (3) after the glass welded by the femtosecond laser in the step (2) is naturally cooled, welding a welding seam welded by the femtosecond laser in the step (2) and a range which is 1-10mm away from the welding seam by using low-flux CO2 laser with the processing power lower than 1000W and the scanning speed lower than 500mm/min. According to the method, the sealing performance of ...

Emergency protection circuit device of transformer and protection method thereof

The invention belongs to the technical field of transformer protection, and discloses an emergency protection circuit device of a transformer, which comprises a detection assembly, a calibration assembly, an exhaust assembly and a remote control assembly, the upper end of the detection assembly is provided with an exhaust assembly used for exhausting gas in the detection assembly. The detection assembly is provided with a calibration assembly used for detecting the accuracy of the detection assembly and carrying out calibration. A remote control assembly is mounted on the detection assembly; the detection assembly comprises a cover plate, a box body, a torque sensor, a hollow plate, a straight shaft, a transverse shaft, a second bevel gear and a first bevel gear. The invention further discloses a protection method. Through the mode, the structure of the emergency protection circuit device of the transformer is simplified, the detection principle is simple, and the manufacturing cost is ...

Area is from distribution structure's liquid distributor

The utility model provides an area is from distribution structure's liquid distributor, including a plurality of liquid distributor structures that set up side by side, the liquid distributor structure includes: distribution groove and a plurality of set firmly on the distribution groove lateral wall from distribution structure, include the catheter and set up the surface distribution dish of being connected in the catheter below with the catheter from distribution structure. The utility model discloses a structure can go out a liquid hole so that flow into distribution groove's liquid process, after distribution hole's the reposition of redundant personnel, flow through the upper surface of surface distribution dish again, finally in a plurality of gangs of evenly distributed's of surface distribution dish profile of tooth edge's formation tiny liquid stream falls into the below filler, solved under the operating mode of little liquid measure or easily stifled system, distribution hole ...

Voltage converter

The invention relates to an electric pressure converter which comprises a pulse-width modulation controller, an upper bridge transistor, a lower bridge transistor and a low pass filter; wherein, the pulse-width modulation controller utilizes a first resistance arranged inside the controller to lead a phase pin of a pulse-width modulation control chip to be taken as a multifunctional pin, and the electric pressure converter utilizes an inductance current sensor inside the pulse-width modulation control chip to count a step current generator, an oscillator, a first comparator, a second comparator, a current source and a first resistance; and a light load efficiency improving circuit is formed by the lower bridge transistor. The electric pressure converter adopts the light load efficiency improving circuit to reduce the switch frequency between the upper bridge transistor and the lower bridge transistor when in a light load mode, thus reducing the efficiency loss. Furthermore, as the electric ...

Voltage converter

The invention relates to an electric pressure converter which comprises a pulse-width modulation controller, an upper bridge transistor, a lower bridge transistor and a low pass filter; wherein, the pulse-width modulation controller utilizes a first resistance arranged inside the controller to lead a phase pin of a pulse-width modulation control chip to be taken as a multifunctional pin, and the electric pressure converter utilizes an inductance current sensor inside the pulse-width modulation control chip to count a step current generator, an oscillator, a first comparator, a second comparator, a current source and a first resistance; and a light load efficiency improving circuit is formed by the lower bridge transistor. The electric pressure converter adopts the light load efficiency improving circuit to reduce the switch frequency between the upper bridge transistor and the lower bridge transistor when in a light load mode, thus reducing the efficiency loss. Furthermore, as the electric ...

Voltage converter

The invention relates to an electric pressure converter which comprises a pulse-width modulation control chip, an upper bridge transistor, a lower bridge transistor and a low pass filter; wherein, the pulse-width modulation control chip is provided with a boot pin, a phase pin, a ugate pin, a lgate pin, a Vcc pin and a GND pin; the pulse-width modulation control chip works to drive the upper bridge transistor and the lower bridge transistor through the pins; the pulse-width modulation control chip utilizes the phase pin be taken as a multifunctional pin, thus realizing various extended functions such as overcurrent protection, reverse current control, light load efficiency improvement, etc. The pulse-width modulation control chip of the electric pressure converter is not needed to be additionally provided with the multifunctional pin. Therefore, fewer pins are available on the pulse-width modulation control chip, and the size can be further reduced, thus the invention is suitable for the ...

Bird repelling device for electric power

The invention belongs to the technical field of bird repelling of power equipment, and particularly relates to a bird repelling device for power, which is provided with at least one bird repelling component and is characterized in that the bird repelling component is used for repelling birds by at least one bird repelling thorn through piston movement, the piston movement of the bird repelling thorn is driven by a gear, and the gear is driven by wind power; the bird repelling device has the advantages of being simple in structure, good in bird repelling effect, energy-saving, environment-friendly, capable of repelling birds under the breeze condition, wide in bird repelling range and the like.

Protective device for power constructors

The invention belongs to the technical field of power construction protection, and particularly relates to a power constructor protection device which comprises a sliding sleeve, a safety rope and a safety belt, the two ends of the safety rope are fixedly installed on the back of the safety belt, the sliding sleeve is made of an elastic material, the safety rope penetrates through the upper half portion of the sliding sleeve, and the safety rope can slide relative to the sliding sleeve when the safety rope is pulled; when in use, the sliding sleeve is sleeved outside the insulator. Two conical clamping pieces are fixedly installed on the safety rope and located on the two sides of the sliding sleeve respectively. The two sides of the sliding sleeve are each provided with two limiting blocks, and the limiting blocks limit conical clamping pieces fixedly installed on the safety rope. Compared with the prior art, according to the equipment designed by the invention, when a worker accidentally ...

Chinese medicine for gastropathy related to pyloric spiri-bacillus

The Chinese medicine consists of Astragalus membranaceus, Coptidis, betel nut, Rhizoma corydalis, Rhizoma bletillae, inkfish bone and licorice. It has obvious cure effect on the said gastropathy.

Variable-rail three-dimensional composite knitting and shaping machine with angular guide wheels

The invention relates to a variable-rail three-dimensional composite knitting and shaping machine with angular guide wheels. An inner 8-shaped railway groove and an outer 8-shaped railway groove are arranged in a knitting base plate as well as a cuboid groove connecting the inner and outer 8-shaped railway groove. The first angular guide wheels and the second angular guide wheels are arranged in an inner ring and an outer ring; yarn carriers are mounted on the first angular guide wheels and the second angular guide wheels and can move along the 8-shaped railway grooves. First driving gears are connected with the first angular guide wheels via connecting rods, second driving gears are connected with the second angular guide wheels via connecting rods and meshed with the first driving gears, driving gears are mounted on the motor and meshed with racks, rail plates are connected with the racks via the connecting rods and accommodated in the cuboid groove. By moving the rail plates, the yarn ...

Single electric signal excited ultrasound elliptic-vibration multi-vibrator material conveying device

The invention discloses a single electric signal excited ultrasound elliptic-vibration multi-vibrator material conveying device which is mainly used for accurately and precisely conveying strip-shaped materials. The material conveying device disclosed by the invention uses a plurality of vibrators as excitation bodies, wherein each of the vibrators comprises an ultrasonic vibration transducer, an elliptic vibration mode converter, and a friction driving block arranged at the front end of the elliptic vibration mode converter; each of the ultrasonic vibration transducers comprises a bolt, a rear cover plate, a piezoelectric ceramic piece, an electrode plate and a front cover plate, which are sequentially arranged on the bolt in a sleeving manner, and the rear cover plate, the piezoelectric ceramic piece, the electrode plate and the front cover plate are connected and pressed tightly through the bolt ; the elliptic vibration mode converters are arranged at the front ends of the ultrasonic ...

High-sulfur-content fractured gas reservoir sulfur deposition prediction method based on fractal medium theory

The invention discloses a high-sulfur-content fractured gas reservoir sulfur deposition prediction method based on a fractal medium theory. According to the method, acid gas sulfur solubility experimental data under typical high-sulfur-content gas reservoir temperature, pressure range and natural gas composition conditions are collected, and a statistical analysis and multiple regression analysis method is adopted, so that a solubility prediction model suitable for the gas reservoir element sulfur is established. On the basis, a fractal medium theory, a gas-water seepage theory and a sulfur solubility pressure gradient function are combined, a mathematical model for predicting the sulfur deposition of the high-sulfur-content fractured gas reservoir gas well is established, and comparison and verification are carried out. According to the method, theoretical guidance and technical support are provided for reliable evaluation of the sulfur blockage damage condition of the high-sulfur-content ...

Exerciser for abdomen and waist

The utility model relates to body-building equipment, which is particularly suitable for exercise of parts of abdomens and waists of human bodies. The utility model comprises a handle bar, a left and a right swing arms, a left and a right elbow cushions, a pillow bar, a joint for the pillow bar, wherein, the left and the right swing arms are in symmetrical hyperbolic three-bent structure; one end of the left swing arm and one end of the right swing arm are respectively and fixedly connected with an arc-shaped handle bar, and the other end of the left swing arm and the other end of the right swing arm are respectively provided with one elbow cushion; the pillow bar is arranged between the left and the right swing arms, and is movably connected with the left and the right swing arms through the joint for the pillow bar which is provided with a pillow cushion. In the utility model, because the pillow bar is movably connected with the left and the right swing arms through the joint for the ...

Thermoelectric type micro power supply unit based on cold-heat source balance

The invention discloses a thermoelectric microtype power supply device based on cold-hot source balance, namely a cylinder formed by in turn superposing and fixing covered container with cold storage material, thermoelectric converter, isolating cover and combustion table as well as hollow base, where the isolating cover is of an inverted cup shape, the cup mouth is arranged with tooth slots and the combustion table is a cylinder with interlayer inside, the vertical section of the combustion is H-shaped, the central interlayer has hole, a lampwick is arranged in the hole, one end of the lampwick is placed in the base cavity, the circular wall on the top of the combustion table has tooth slots, the isolating cover is covered on the top circle, the middle cavity forms a combustion chamber, the tooth walls of the isolating cover and the combustion table closely slide, and the slot mouths compose gas inlet of the combustion chamber. During using course, it uses the high-temperature heat generated ...

Controller data processing method and system

The invention relates to a controller data processing method and system. The method comprises the steps that S1, a pressure sensor detects pressure data in real time and forms a pressure combination sequence; s2, determining the current state of the user based on the pressure combination sequence; s3, determining a subsequent pressure combination sequence of the user, and performing adjustment judgment according to the subsequent pressure combination sequence; and S4, giving a lifting table adjustment suggestion or carrying out active adjustment. On the basis of multiple sensors and intelligent adjustment judgment, a lifting table adjustment mode transparent to different use scenes and users is realized, so that the applicability of the lifting table is improved, intelligent adjustment control of the lifting table is simply and conveniently met while the structural complexity of the table is not increased, and user requirements are met.

Multi-element fertilizer synergist and production method

The invention discloses a multi-element fertilizer synergist and a production method, relates to a synergist and a stabilizer which are added in fertilizer containing nitrogen and phosphorus fertilizer, and belongs to the field of synergistic fertilizer. The multi-element fertilizer synergist is prepared from the following raw materials of, by weight, 35-45% of nitrogen, 25-35% of phosphorus, 15-25% of potassium, 1-5% of calcium, 0.9-4.9% of magnesium, 1-3% of sulfur, 0.3-0.5% of boron, 0.3-0.5% of zinc, 1% of active humus, 0.1-0.2% of plant hormones and 0.1-0.2% of drought-resistant and water-absorbent agent. The multi-element fertilizer synergist has the advantages that the multi-element fertilizer synergist is high in solubility and free of nutrient residual, and can obviously enhance permeation capacity and adhesion capacity of the fertilizer and improve the capacity and the speed of the fertilizer entering plant bodies.

Quantitative evaluation method for sulfur plugging damage of gas well reservoir of acid gas reservoir

The invention discloses an acid gas reservoir gas well reservoir sulfur blockage damage quantitative evaluation method, and belongs to the field of acid gas reservoir sulfur deposition prediction and evaluation.The method comprises the following steps that multiple linear regression is conducted on sulfur solubility experiment data, and the sulfur solubility in natural gas is predicted; establishing an acidic gas reservoir elemental sulfur saturation prediction model according to the sulfur solubility; according to the acidic gas reservoir elemental sulfur saturation prediction model, obtaining a sulfur saturation prediction result by adopting a numerical integration method; and according to a sulfur saturation prediction result, based on the established reservoir permeation damage evaluation model and equal-diameter spherical particle medium permeation damage evaluation model, calculating the reservoir sulfur blockage damage percentage, thereby completing quantitative evaluation of the ...

Food with appearance of aqueous livings and producing method

A shape-imitative seafood is made up of fresh marine product, amphibian, auxiliary materials, flavouring and natural edible pigment and features that it has different shapes similar to those of animals used as raw materials and rich nutrients.

Time recording and clock synchronizing method and device for oceanographic instruments

The invention relates to a time recording and clock synchronizing method and device for oceanographic instruments. The time recording and clock synchronizing device for the oceanographic instruments comprises a GPS antenna, a time recording and clock synchronizing device body, a power supply, an upper PC and a trigger device, wherein the GPS antenna is connected with the time recording and clock synchronizing device body, the power supply and the trigger device are connected to the time recording and clock synchronizing device body, and the time recording and clock synchronizing device body is connected to the upper PC. The time recording and clock synchronizing method and device for the oceanographic instruments have the advantages of being high in integration level, high in antijamming capability, high in reliability, capable of achieving the backup function, and the like. The time recording and clock synchronizing method and device for the oceanographic instruments is suitable for time ...

Cultivation method for yellow heart cabbage

The invention discloses a cultivation method for yellow heart cabbage. The cultivation method comprises the steps of seed soaking and accelerating germination, soil preparation and seeding, field management and timely harvest and the like. According to the cultivation method provided by the invention, seeds are subjected to seed soaking and accelerating germination by adopting a sterilization additive and a nutrient additive; the incidence of plants is reduced; the method has certain acceleration effect on improving the overall quality of the plants; the added slow release potash fertilizer can effectively improve the soil quality, and the soil quality is more suitable for the growth requirement of the yellow heart cabbage. The cultivation method for yellow heart cabbage has the advantages that the method is scientific and reasonable, the mu yield can be effectively improved, the quality of yellow heart cabbage is improved, and the planting profit is increased.

Full-automatic scaling and fish killing machine

The full-automatic scaling and fish killing machine comprises a transmission module, a scaling module, a belly cutting module and a cleaning module which are arranged on a mounting frame, the mounting frame is of a square frame structure, a transmission base is arranged at the bottom of the mounting frame, the transmission module comprises two transmission bases arranged at the top of the transmission base, a transmission chain group is arranged at the top of each transmission base, and each transmission chain group comprises a transmission chain, a driving chain wheel and two driven chain wheels; the two driven chain wheels of each transmission chain set are sequentially arranged in the conveying direction, and positioning clamping thorns used for fixing fish maws are arranged on the outer sides of the transmission chains. The scaling module comprises a horizontal fixing plate and a vertical fixing plate; a horizontal connecting frame is arranged between the vertical fixing plate and the ...

Single-excitation ultrasound elliptic-vibration multi-vibrator material conveying device

The invention discloses a single-excitation ultrasound elliptic-vibration multi-vibrator material conveying device which is mainly used for accurately and precisely conveying strip-shaped materials. The material conveying device disclosed by the invention uses a plurality of vibrators as excitation bodies, wherein each of the vibrators comprises an ultrasonic vibration transducer, an elliptic vibration mode converter, and a friction driving block arranged at the front end of the elliptic vibration mode converter; each of the ultrasonic vibration transducers comprises a bolt, as well as a rear cover plate, a piezoelectric ceramic piece, an electrode plate and a front cover plate, which are sequentially arranged on the bolt in a sleeving manner, and the rear cover plate, the piezoelectric ceramic piece, the electrode plate and the front cover plate are connected and pressed tightly through the bolt ; the elliptic vibration mode converters are arranged at the front ends of the ultrasonic vibration ...

Process for surface treatment of internal wall of open-end spinning frame rotor

The invention relates to a process for strengthening abrasive resistance of an internal surface of an open-end spinning frame rotor, with the purposes of effectively improving the internal surface hardness and prolonging the service life of the rotor and characteristics of convenience for operation and favorable economic performance. The technical scheme is as follows: the process for surface treatment of internal walls of the open-end spinning frame rotor comprises the following steps of: (1) machining to control the roughnesses of a glide plane and a collecting groove at Ra0.7-0.9; quenching the rotor by heating to 800-900 DEG C at the intermediate speed of 15-25 DEG C/min, keeping for 15-25min and cooling in water of 20DEG C to the ambient temperature; (3) then carrying out lower tempering treatment by heating to 220-240 DEG C at the intermediate speed of 15-25 DEG C/min, keeping for 12-18min, and then cooling in air to the ambient temperature; and (4) carrying out chemical nickel-plating ...

Method for calculating and testing desorption gas capacity of shale gas under water-containing condition

The invention discloses a method for calculating the desorption gas amount of shale gas under a water-containing condition. The method comprises the following steps: correcting free space volumes under different test pressure points; performing experimental determination on the CH4 adsorption capacity of the shale dry sample under the highest test pressure; and testing the CH4 desorption process under the water-containing condition and calculating the desorption gas amount. The method simulates the desorption process of shale gas adsorption-water balancing-pressure reduction, and accords with the desorption process of adsorbed gas in a reservoir under the influence of retained water when shale gas is actually exploited; the invention also provides a method for correcting the volume of the free space influenced by the change of the adsorbed gas and the change of the water content and an improved calculation formula of the CH4 desorbed gas amount under the water-containing condition.

Voltage converter

The invention relates to a voltage converter which comprises a pulse width modulation controller, an upper bridge transistor, a lower bridge transistor, a low-pass filter and an enable transistor. The pulse width modulation controller comprises a current supply, an enable comparator, an electrify restoration circuit, a first comparator, a first driver, a second driver and a grid control logic circuit. The light load efficiency improved circuit comprises an inductive current sensor, a counting step current generator, an oscillator, the second comparator, the third comparator, current supply, a first resistor and the lower bridge transistor. The light load efficiency improved circuit is used in the voltage converter to reduce the switch frequency of both the upper bridge transistor and the lower bridge transistor when the voltage converter is in the mode of the light load. Therefore, the efficiency loss can be reduced so that the stand-by time of the electronic device using the voltage converter ...

METHOD FOR MAKING FERMENTED TOMATO LIQUOR

Potato seed storage method

The invention provides a potato seed storage method, which comprises the following steps: selecting potato seeds with uniform size; using 1 to 16 mg/l of uniconazole to soak the potato seeds for 15 to 30 min; and storing the potato seeds under the condition of 18 to 20 DEG C after the moisture is dried. The method prolongs the storage period of the potatoes, and can also regulate and control the storage period of the potatoes so that the dormancy can be fast broken when the potatoes needs to sprout, and strong and healthy seedlings are sprouted. The method has simple operation, and is suitable for wide popularization and application.

Chinese medicine for gastropathy related to pyloric spiri-bacillus

Paper medicine box steel seal character recognition method based on improved YOLOV5 model

The invention discloses a paper medicine box steel seal character recognition method based on an improved YOLOV5 model. The method comprises the following steps: acquiring a steel seal character image of a medicine box by using image acquisition equipment; performing preprocessing such as image enhancement on the image, and labeling an identification area; inputting into an improved YOLOV5 model for training to obtain a trained YOLOV5 model; according to the improved YOLOV5 model, a high-efficiency position attention (CA) mechanism is added in a backbone network of YOLOV5, so that the model network can pay attention to large-range position information and does not bring excessive calculation amount, model performance improvement is facilitated, and a target can be better positioned and recognized; the SimSPPF is used for replacing an SPPF rapid pooling layer, so that the training speed is increased; for dense small targets, a smaller prior frame is additionally used in the model, and a ...

Single-excitation ultrasonic elliptic-vibration multi-vibrator material conveying device

The invention discloses a single-excitation ultrasonic elliptic-vibration multi-vibrator material conveying device which is mainly used for accurately and precisely conveying strip materials. Multiple vibrators are adopted as vibration excitation bodies, and each vibrator comprises an ultrasonic vibration transducer, an elliptical vibration mode converter and a friction drive block arranged at the front end of the elliptical vibration mode converter; each ultrasonic vibration transducer comprises a bolt and a rear cover plate, piezoelectric ceramic pieces, an electrode slice and a front end cover sequentially sleeving the bolt, and the rear cover plate and the front cover plate are passed by the bolt to have the rear cover plate, the piezoelectric ceramic pieces, the electrode slice and the front end cover connected and pressed; each elliptical vibration mode converter is arranged at the front end of each ultrasonic vibration transducer and is of a wedge structure, and the elliptical vibration ...

微型旋转式发动机

The present invention relates to a microtype rotary engine. It includes a cylinder and a rotor placed in cylinder, said rotor is an integrated body formed from upper plate whose centre has hole and lower plate whose contral hole interior is equipped with internal gear which are bonded together, the central projection of its rear end cover has an external gear, the internal gear of lower plate of the rotor and the external gear of the rear end cover are matched and made into epicyclic gear, on its eccentric square shaft the front disk, eccentric disk and rear disk are fixed, and the axis of front disk, rear disk and square shaft is coincided with central line of frond end and rear end covers, and the central line of eccentric disk is coincided with central line of rotor, and the front and rear disks and front and rear end covers are formed into rotating pair connection.

Microbial fuel cell

The invention microbe fuel cell consists of box, separating plate dividing the box to positive pole cavity and negative pole cavity, there is a hole on the separating plate, hydrogen selecting film is fit on the hole. In positive pole cavity, there is solution compounded by amylaceum, sodium dithydrogen phosphate and methylene blue, a sealine lid is covered on the positive pole cavity, a positive pole graphite rod is fit on the sealing lid, one end of the positive pole grahpite rod with honeycomb small holes rod is soaked in the solution in positive pole cavity, beer saccharomycetes and the substratum are in the honeycomb small holes. In negative pole cavity, there is solution compounded by potassium ferricyanide and fumaric and ferrous, an end lid is covered on the negative pole cavity, a negative pole graphite rod is fit on the end lid, one end of the negative pole graphite rod is soaked in the solution in negative pole cavity.

Single electrical signal excitation ultrasonic elliptic vibration micro-machining working platform

The invention discloses a single electrical signal excitation ultrasonic elliptic vibration micro-machining working platform which comprises a vibration isolation platform, a transverse motion working platform, a longitudinal motion working platform, a housing unit, an ultrasonic vibration transducer arranged in the housing unit, an ultrasonic power supply, an elliptic vibration mode converter and a small-sized working platform arranged at the front end of the elliptic vibration mode converter, wherein the housing unit comprises a front baffle, an inner sleeve and a rear baffle; the ultrasonic vibration transducer comprises a bolt as well as a rear cover plate, a piezoelectric ceramic piece, electrode plates and a front cover plate which sleeve the bolt in sequence; the rear cover plate, the piezoelectric ceramic piece, the electrode plates and the front cover plate are connected and compressed through the bolt; the elliptic vibration mode converter is cylindrical and arranged at the front ...

White garlic planting method

The invention discloses a white garlic planting method comprising the steps of: (1) soil preparation and close planting, (2) field management, and (3) harvesting. According to the white garlic planting method, with a soil improving agent adopted during soil preparation, soil acid-base property can be improved; soil quality can be improved; and plant adaptability to soil can be enhanced. Nutritive soil covered on the surface of the white garlic can effectively promote white garlic plant growth, can provide reasonable nutrients for the white garlic, and assists in ensuring healthy and fast growth of the white garlic. With the method provided by the invention, plant growth can be effectively promoted; disease resistance can be improved; and yield can be improved.

Zero-current detecting circuit and DC converter

The invention provides a zero-current detecting circuit. The zero-current detecting circuit comprises a first current mirror coupled to two transistors, the first transistor is coupled to a grounding end through a first resistor, and the second transistor is coupled to a detection node through a second resistor. The output of the first transistor is coupled to the negative input end of a first comparator, and the output of the second transistor is coupled to the positive input end of the first comparator. When the voltage level of the positive input end of the first comparator is greater than the voltage level of the negative input end of the first comparator, the first comparator outputs a predetermined signal to indicate appearance of zero currents of the detection node.

Voltage converter

The invention relates to a voltage converter which comprises a pulse width modulation controller, an upper bridge transistor, a lower bridge transistor, a low-pass filter and an enable transistor. The pulse width modulation controller comprises a current supply, an enable comparator, an electrify restoration circuit, a first comparator, a first driver, a second driver and a grid control logic circuit. The light load efficiency improved circuit comprises an inductive current sensor, a counting step current generator, an oscillator, the second comparator, the third comparator, current supply, afirst resistor and the lower bridge transistor. The light load efficiency improved circuit is used in the voltage converter to reduce the switch frequency of both the upper bridge transistor and the lower bridge transistor when the voltage converter is in the mode of the light load. Therefore, the efficiency loss can be reduced so that the stand-by time of the electronic device using the voltage converter ...

Single electrical signal excitation ultrasonic elliptic vibration extrusion processing device

The invention discloses a single electrical signal excitation ultrasonic elliptic vibration extrusion processing device which comprises a supporting plate, a jacket, a linear bearing, a pre-pressure device, a housing unit, an ultrasonic vibration transducer arranged in the housing unit, an elliptic vibration mode converter and an extrusion head arranged at the front end of the elliptic vibration mode converter, wherein the supporting plate is arranged on the jacket; the housing unit comprises a front baffle, an inner sleeve and a rear baffle; the linear bearing is supported between the housing unit and the jacket; the pre-pressure device is arranged at the rear end of the housing unit in the jacket; the ultrasonic vibration transducer comprises a bolt as well as a rear cover plate, a piezoelectric ceramic piece, electrode plates and a front cover plate which sleeve the bolt in sequence; the rear cover plate, the piezoelectric ceramic piece, the electrode plates and the front cover plate ...

Battery health state estimation method fusing mechanism and data driving model

The invention relates to a battery health state estimation method integrating a mechanism and a data driving model in the technical field of battery health pipelines, which comprises the following steps of: constructing a reduced-order electrochemical model with relatively strong battery response behavior description, and generating a rich training data set; constructing a data driving model for estimating the SOH of the battery; the method comprises the following steps: constructing a source data set based on a large number of charge and discharge data fragments generated by a reduced-order electrochemical model, optimizing free variables in a data-driven model by adopting an adaptive momentum estimation algorithm, and completing pre-training of the data-driven model; after a small amount of real current and voltage data and SOH labels are obtained, part of source data sets and real data are mixed, transfer learning is carried out on the basis of a pre-trained data driving model, and SOH ...

Stairs-based piezoelectric generating device

The invention discloses a stairs-based piezoelectric generating device. The device comprises two parts, namely, a rotor and a stator; the rotor which is arranged above the stator comprises a pedal, and a locating pin that is connected to the pedal; the stator comprises a base plate, a supporting limiting strip, a spring and a piezoelectric generating unit, wherein the supporting limiting strip, the spring and the piezoelectric generating unit are mounted on the base plate; the piezoelectric generating unit comprises an upper pressing plate, a T-shaped elastic rod, a drive pressing block, a driven pressing block, an arc-surface bottom plate, a supporting plate, a connecting part, a copper pole plate, an A piezoelectric ceramic chip and a B piezoelectric ceramic chip, wherein the drive pressing block is arranged at the upper side of the T-shaped elastic rod and close to the upper pressing plate; the driven pressing block is arranged at the end part of the lower side of the T-shaped elastic ...

Light-sensitive catalyst of organic rare-earth complex compound for photodegradable poly vinyl film

The organic rare-earth complex is a long-chain rare-earth paraffine carboxylate with a molecular formula: (R'COO)XRE, where R' is naphthenic base or alkyl, RE must contain two or more symbiotic light rare-earth ions, such as La and Ce, and X is 1-3. The consumption of this photosensitive catalyst is 0.05-1.0 Wt.% for preparing controllable photodegradable polyvinyl film whose advantages are good transparency, and 10-100 micrometers in thickness. The film may be used as agricultural ground film or packing bag.

Uses of a marine yeast and corresponding microorganism fuel cell and method for preparing the same

The invention discloses uses of a marine yeast, preservation No. of the marine yeast Rhodosporidimu paludigenum Fell & Tallman is IMI 394084, the marine yeast can be used in microorganism fuel cell for electricity generation directly. The invention discloses a microorganism fuel cell at the same time, including an open anode chamber (2) with an anode electrode (5) provided inside and an open cathode chamber (1) with a cathode electrode provided inside (4), a proton exchange membrane is provided between the anode chamber (2) and the cathode chamber (1), a liquid organic fuel containing bacteria solution is provided in the anode chamber (2), and the bateria solution is obtained by fermenting the marine yeast of preservation No. 394084. The invention also discloses method of preparing the microorganism fuel cell at the same time. The microorganism fuel cell of the invention is provided with features of environment friendly.

Single electric signal excitation ultrasonic elliptic vibration multi-vibrator bidirectional material conveying device

The invention discloses a single electric signal excitation ultrasonic elliptic vibration multi-vibrator bidirectional material conveying device which is mainly applied to accurate and precise conveying of strip-shaped materials. According to the single electric signal excitation ultrasonic elliptic vibration multi-vibrator bidirectional material conveying device, multiple vibrators are adopted as shock excitation bodies and divided into two sets, and the two sets of vibrators are arranged in an alternated opposite mode. Each vibrator comprises an ultrasonic vibration energy converter, an elliptic vibration mode converter and a friction driving block arranged at the front end of the elliptic vibration mode converter. Each ultrasonic vibration energy converter comprises a bolt, a rear cover plate, a piezoelectric ceramic piece, an electrode plate and a front cover plate, wherein the rear cover plate, the piezoelectric ceramic piece, the electrode plate and the front cover plate are arranged ...

Make -up machine is woven to changeable angle guide pulley formula combined material three -dimensional of track

The utility model relates to a make -up machine is woven to changeable angle guide pulley formula combined material three -dimensional of track, it is woven and is equipped with two ring 8 inside and outside font track groove on the chassis to and the cuboid groove in two ring of 8 font track groove of connection, first angle guide pulley, second angle guide pulley are two ring inside and outside settings, taking the yarn ware and installing on first angle guide pulley and second angle guide pulley, it can follow the motion of 8 font track grooves, a drive gear passes through the connecting rod and first angle guide pulley is connected, the 2nd drive gear passes through the connecting rod and second angle guide pulley is connected, and it meshes with a drive gear mutually, install the driving gear on the motor, driving gear and toothed bar mesh, track board pass through the connecting rod and the rack is connected, and it is acceptd in the cuboid inslot. The utility model discloses a removal ...

Rotary ultrasonic vibration line cutting device

The invention discloses a rotary ultrasonic vibration line cutting device which comprises a lathe bed, a longitudinal moving working platform, a transverse moving working platform, a workpiece support, a C-type line frame, a diamond fret saw, an upper ultrasonic vibration device, a lower ultrasonic vibration device, an upper rotating motor, a lower rotating motor, an upper electric energy transmission device, a lower electric energy transmission device, a fret saw pre-tightening device, a fret saw reciprocating motion mechanism, an ultrasonic generator and an electrical control device. The upper ultrasonic vibration device and the lower ultrasonic vibration device are fixed to an upper working arm and a lower working arm of the C-type line frame respectively, ultrasonic electric energy output by the ultrasonic generator is converted into mechanical vibration of the ultrasonic frequency through a piezoelectric transducer, the diamond fret saw is driven to perform ultrasonic vibration, the ...

Manufacturing method of oil and gas reservoir benefit development physical property lower limit chart

The invention discloses a manufacturing method of an oil and gas reservoir benefit development physical property lower limit chart. The manufacturing method specifically comprises the following steps: step 1, testing basic physical properties of a rock core; 2, performing an indoor productivity simulation experiment; 3, establishing a similarity conversion model; 4, making a benefit development physical property lower limit chart; and 5, developing a physical property lower limit chart by using benefits. According to the manufacturing method of the oil and gas reservoir benefit development physical property lower limit chart, whether the oil and gas reservoir can meet the given benefit capacity or not under different geology and production conditions serves as the judgment basis, and the benefit development physical property lower limit comprehensively considers the influence of multiple factors such as the benefit capacity, the production system, the reservoir thickness and the production ...

Handle device suitable for operation of underwater robot

The invention discloses a device requiring a manipulator of an underwater robot to finish relevant releasing and dragging operation when an underwater observation platform is used for lying on the seabed and especially relates to a handle device suitable for operation of an underwater robot. The handle device comprises a handle, a hanging protector, a spring piece with a semi-circular ball, a socket and a limiting bolt. The socket is mounted to the underwater observation platform required to be laid to the seabed. The handle is inserted into the socket. The spring piece with the semi-circular ball is clamped into a slope-shaped clamping groove of the socket and connected with the handle by adopting a welding mode. A guiding limiting groove of the handle corresponds to the limiting bolt of the socket. The hanging protector is arranged at the rear end of the handle. The handle device suitable for operation of the underwater robot has following advantages: the handle device is completely suitable ...

Single-electric-signal-driven rotary ultrasonic motor

The invention discloses a single-electric-signal-driven rotary ultrasonic motor. The single-electric-signal-driven rotary ultrasonic motor comprises a core shaft, and a rear cover plate, piezoelectric ceramic plates, electrode plates, an elliptical vibration mode converter, a friction disc, a bearing, a spring and a nut which are sequentially arranged on the core shaft in a sleeving manner; the core shaft, the rear cover plate, the piezoelectric ceramic plates, the electrode plates and the elliptical vibration mode converter form a stator part of the ultrasonic motor; the friction disc and the bearing form a rotor part of the ultrasonic motor; the spring and the nut form a positive-pressure pre-tightening force adjusting mechanism of the rotor part and the stator part of the ultrasonic motor. According to the single-electric-signal-driven rotary ultrasonic motor, by virtue of the elliptical vibration mode converter specially designed by compounding straight beams and oblique beams, and ...

Uses of a marine yeast and corresponding microorganism fuel cell and method for preparing the same

The invention discloses uses of a marine yeast, preservation No. of the marine yeast Rhodosporidimu paludigenum Fell & Tallman is IMI 394084, the marine yeast can be used in microorganism fuel cell for electricity generation directly. The invention discloses a microorganism fuel cell at the same time, including an open anode chamber (2) with an anode electrode (5) provided inside and an open cathode chamber (1) with a cathode electrode provided inside (4), a proton exchange membrane is provided between the anode chamber (2) and the cathode chamber (1), a liquid organic fuel containing bacteriasolution is provided in the anode chamber (2), and the bateria solution is obtained by fermenting the marine yeast of preservation No. 394084. The invention also discloses method of preparing the microorganism fuel cell at the same time. The microorganism fuel cell of the invention is provided with features of environment friendly.

Multi-vibrator two-way material conveying device with single-excitation ultrasonic elliptic vibration

The invention discloses a multi-vibrator two-way material conveying device with single-excitation ultrasonic elliptic vibration. The multi-vibrator two-way material conveying device is mainly used for accurately and precisely conveying strip-shaped materials. According to the multi-vibrator two-way material conveying device, a plurality of vibrators are used as vibration exciters and are divided into two groups, and the two groups of vibrators are alternately and oppositely arranged; each vibrator comprises an ultrasonic vibration energy converter, an elliptical vibration mode converter and a friction drive block which is arranged at the front end of the elliptical vibration mode converter; each ultrasonic vibration energy converter comprises a bolt, and a rear cover plate, a piezoelectric ceramic plate, an electrode plate and a front cover plate which are sequentially arranged on the bolt in a sleeving manner; the rear cover plates and the front cover plates are used for connecting and ...

High-efficiency dust recovery system

The invention discloses a high-efficiency dust recovery system which comprises a dust collecting cover, wherein the dust collecting cover is communicated with an exhaust fan through a pipeline, the exhaust fan is communicated with a dust recovery chamber through a pipeline, the dust recovery chamber is communicated with a centrifugal fan through a pipeline, the centrifugal fan is connected with a sealed water tank through an arc pipeline, and a water pouring tower is arranged on the sealed water tank. According to the system, the dust enters the dust recovery chamber, flows in a bending manner in a channel of the dust recovery chamber, is subjected to repeated primary precipitation due to the low temperature air flow and the self-weight of the dust, and is driven by the air flow generated by the centrifugal fan to enter the sealed water tank, wherein part of the dust falls into the water in the sealed water tank and is primarily precipitated, and the rest of the dust is brought by the air ...

一种折弯机

本实用新型提供一种折弯机，包括底座、设置于底座上的定位机构以及设置于定位机构一侧的折弯机构，折弯机构包括旋转支架、安装于旋转支架上的折弯轴、与折弯轴固定连接的固定块、设置于固定块顶部与旋转支架滑动配合的导向轴、与折弯轴相连的折弯块以及驱动旋转支架旋转的折弯气缸。定位机构对产品定位，产品可以是尺寸较小的管件或者是传感器等，折弯机构对产品的一端折弯，具体的，将固定块升高后，放入产品，再推动固定块下降，折弯气缸驱动旋转支架转动，旋转支架带动固定块和折弯块旋转一定角度，折弯块将产品折弯一定的角度，即实现了产品的自动化折弯，折弯曲率固定，产品质量稳定，节省人力，有利于批量生产。