Method for intelligently adjusting manipulator and grasping force on basis of visual image analysis

The invention relates to a method for regulating a manipulator and grasping force thereof. The manipulator comprises a vision image acquisition system and a database. The vision image acquisition system takes and acquires 3D (three-dimensional) entitative images of objects to be grasped by the manipulator, simultaneously scans dimension information of the acquired objects, acquires the volumes of the acquired objects and transmits the volumes of the acquired objects to a central processing unit; image data of various objects and parameters of the density, the roughness and friction coefficients of materials of the various objects are stored in the database; the central processing unit compares the acquired 3D entitative images to the image data in the database, judges the acquired 3D entitative images, determines the types, the dimensions and the volumes of the grasped objects, calls out the parameters of the density, the roughness and the friction coefficients of the corresponding materials ...

Proton exchange membrane fuel cell bipolar plate with high mechanical property, electric conductivity and thermal conductivity

The invention discloses a proton exchange membrane fuel cell composite material bipolar plate which consists of a phenolic resin, titanium carbide, graphite and a curing agent. The bipolar plate has the electric conductivity of 210S/cm, the bending strength of 36MPa, the compressive strength of 105MPa and the thermal conductivity of 40<-6> W/mK. The graphite powder, the modified phenolic resin and the titanium carbide powder are selected. The titanium carbide (TiC) is in a face-centered cubic crystal form, is high in melting point, high in thermal conductivity, high in hardness, high in chemical stability and high in high-temperature oxidation resistance, does not react with acids at normal temperature and has high corrosion resistance and extremely high electric conductivity (higher than that of pure graphite), the mechanical property, electric conductivity and thermal conductivity of the phenolic resin/graphite composite material bipolar plate can be greatly improved, and the prepared ...

Control panel module for electric pressure pot and electric pressure pot provided with same

The invention provides a control panel module for an electric pressure pot and the electric pressure pot provided with the same. The control panel module for the electric pressure pot comprises a mounting rack, a touch part and a computer control panel, wherein the touch part is arranged on the upper surface of the mounting rack, a through hole penetrating through the touch part in the vertical direction is formed in the touch part, the computer control panel is arranged on the lower surface of the mounting rack and is provided with a switch key and at least one touch press key, the upper end of the touch press key penetrates through the mounting rack and is in contact with the lower surface of the touch part, the upper portion of the switch key penetrates through the mounting rack and the touch part, and the upper portion of the switch key is located above the touch part. The control panel module for the electric pressure pot has the advantages of being good in operating hand feeling, ...

Vector controller of alternating current asynchronous motor

The invention relates to a vector controller of an alternating current (AC) asynchronous motor. The vector controller comprises a control chip, a drive circuit, a three-phase inverter circuit, a Hallsensor and an amplifying and filtering circuit, and is characterized in that a PWM output hardware interlock circuit is connected between the control chip and the drive circuit, and the IGBT overflowing signal of the drive circuit is fed back to the PWM output hardware interlock circuit; a stator current overflowing signal generation circuit is connected with the output end of the amplifying and filtering circuit of a current sampling circuit in parallel, and a stator current overflowing signal is fed back to the PWM output hardware interlock circuit; and a temperature sensor is additionally arranged at the bottom of an IGBT module, a signal thereof is input to the A/D port of the control chip, and the general input/output ports of the control chip are utilized to control the operation of a ...

Appliance fault network maintenance system and method

The invention discloses an appliance fault network maintenance system and method. The fault network maintenance method comprises the steps of detecting a triggering signal of the procedure of an appliance, and determining the mode of operation based on the triggering signal of the procedure; recording the number of operation times of a predetermined procedure of the appliance when the predetermined procedure of the appliance is selected, and monitoring the operation process within the number of operation times; saving a fault code corresponding to a fault if the fault occurs in the operation process of the appliance; and after starting a maintenance procedure on the appliance, a cloud server obtaining the fault code on the appliance and performing the maintenance mode corresponding to the fault code so as to timely handle the fault online for a user, meanwhile facilitate after-sales service, improve maintenance efficiency, and saving time and effort.

In-parallel interpolating device for fully digital receiver and method

The invention relates to an in-parallel interpolating device for a fully digital receiver and a method; the device comprises an input unit which is used for receiving a plurality of sampling points sampled by a local clock, and then serial-parallel conversion is carried out; an in-parallel interpolating unit which comprises a plurality of interpolators and carries out interpolation operation; a timing error detection unit which is used for extracting a clock error signal; a loop filtering unit which is used for computing the clock error control signal according to the clock error signal; and a digital control oscillating unit which is used for obtaining a fraction interval signal and a symbol clock and feeding back to the in-parallel interpolating unit according to the clock error control signal, so as to control the interpolation operation. Under the same processing speed, the device can reduce the requirements to chip multiplication speed and improve the whole processing speed of the ...

Method and system for non-data-aided synchronization of wireless burst communication all-digital receiver

The invention discloses a method and a system for non-data-aided synchronization of a wireless burst communication all-digital receiver. The method comprises the following steps that: an energy detection module takes M sample data as a group to calculate energy sum, when the energy sum detected for successive N times is more than or equal to a preset threshold, data effective signals and effectivedata in the sample data are output, and until the energy sum of the sample data detected for the successive N times is smaller than the preset threshold, the data effective signals and effective dataare stopped outputting; a clock recovery module stores the effective data, utilizes the effective data for clock recovery and transmits the effective data to a carrier recovery module; and the carrier recovery module stores the data after the clock recovery and utilizes the data for carrier recovery. The method adopts a mode of storing first and then treating, and repeatedly utilize limited databetween ...

Channel estimation method applicable to wireless burst communication, and system thereof

The invention discloses a channel estimation method applicable to wireless burst communication, and a system thereof. The method comprises the following steps: emitting a signal frame consisting of a pseudo-random sequence frame head with a cyclic prefix and a frame body in a burst form; performing clock recovery and carrier recovery on the signal frame; performing relevant operation on the signal frame to find an initial position of a pseudo-random sequence; and utilizing the received pseudo-random sequence to perform channel estimation so as to obtain channel parameters. The invention realizes unbiased estimation of the channel parameters by properly designing the structure of the frame and utilizing the pseudo-random sequence with the cyclic prefix, can realize the multiplication and inversion of matrixes only through addition and shift operation by properly selecting channel length, and is simple in operation and easy to realize on hardware.

Parallel channel equalization method

The invention discloses a parallel channel equalization method which comprises the following steps of: (S1) carrying out parallel frame synchronization processing on input data; (S2) carrying out parallel channel estimation by utilizing a known PN (pseudo-random noise) training sequence and a PN training sequence in data output by the step (S1) to obtain a channel parameter; (S3) respectively storing frame body data in the data output by the step (S1) and the channel parameter obtained by the estimation into a first-in first-out memory, making up 0 for the channel parameter, and then beginning to output the frame body data and the channel parameter at the same time; and (S4) sequentially carrying out a parallel FFT (Fast Fourier Transform Algorithm) operation, a parallel division operation and a parallel IFFT (Inverse Fast Fourier Transform) operation on the frame body data and the channel parameter to obtain output data. The invention can reduce the requirements on the processing speed ...

Water quality improving device for aquaculture

The invention relates to the technical field of aquaculture, in particular to a water quality improving device for aquaculture, which comprises a culture pond, the upper end face of the culture pond is slidably connected with a medicine feeding box, and an intermittent feeding cleaning mechanism comprises a driving motor, a screw rod, a screw sleeve, a spraying pipe, a continuous V-shaped groove plate, a valve pipe, a spiral groove, a sliding shaft, a circular ring, a movable shaft, a guide groove, a transmission shaft and a scraper. According to the water quality improving device for aquaculture, medicine is intermittently sprayed while automatic movement is achieved, the situation that the medicine floats on the upper portion of a culture pond and cannot be well fused with water can be avoided by spraying the medicine at the bottom of the culture pond, the phenomenon that hands are contaminated with the medicine and hurt the medicine due to manual medicine throwing is avoided, and the ...

Composite bipolar plate for proton exchange membrane fuel cell and production method thereof

The invention discloses a composite bipolar plate for a proton exchange membrane fuel cell and a production method thereof. The composite bipolar plate comprises phenolic resin, titanium carbide, graphite and a curing agent. In the invention, graphite powder, modified phenolic resin and titanium carbide powder are selected. Titanium carbide (TiC) belongs to face-centered cubic lattices, has high melting point, good heat conducting property, high hardness, good chemical stability and good high-temperature oxidation resistance, can not react with acid at normal temperature and has strong corrosion resistance and high conductivity (higher than pure graphite). The mechanical properties, the conductivity and the heat conducting property of the phenolic resin/graphite composite bipolar plate can be greatly improved, and the prepared bipolar plate not only has higher conductivity and heat conductivity, but also has higher strength and hydrogen corrosion resistance.

Parallel multicode-rate convolutional code decoding method and realization device thereof

The invention discloses a parallel multicode-rate convolutional code decoding method and a realization device thereof. The parallel multicode-rate convolutional code decoding method comprises the following steps of: S1. receiving Nin paths of parallel input signals, and shifting the input signals under the effect of a shifting control signal and outputting the input signals, wherein output signals are also Nin paths of parallel signals, and the Nin is positive integers; S2. partially eliminating the phase ambiguity of the output signals; S3. taking the signals processed in the S2 as effectivedata, adding guard intervals for the effective data to assemble into a data frame, and taking the data frame as the input of a parallel convolutional code; S4. carrying out the convolutional decodingon the assembled data frame after being processed in the step S3; and S5. merging multipath outputs of the parallel convolutional decoding into one path and outputting in parallel. The invention provides ...

Electric pressure cooker and power-on and power-off control circuit thereof

The invention discloses a power-on and power-off control circuit for an electric pressure cooker. The power-on and power-off control circuit comprises a trigger switch, a power-on circuit and a power-off circuit, wherein one end of the trigger switch is connected with a power supply source; the first end of the power-on circuit is connected with the other end of the trigger switch, the second end of the power-on circuit is connected with the power supply source, and the third end of the power-on circuit is connected with the electric pressure cooker; and the first end of the power-off circuit is respectively connected with the other end of the trigger switch and the first end of the power-on circuit, and the second end of the power-off circuit is connected with the electric pressure cooker. According to the invention, the electric pressure cooker can be powered on and powered off through the trigger switch, and the power-on and power-off control circuit is simple to realize, convenient ...

Refrigerator

The invention discloses a refrigerator which comprises a base wire fastener anti-electric-shock structure. A wire fastener comprises a couple of upright wire clamps which are arranged on a base plate in an injection molding mode and located at opposite positions. The top ends of the upright wire clamps are respectively bent inwards so as to limit a wiring harness fixed into the wire fastener. A process hole is formed in the base plate between the upright wire clamps. The bottom surface of the base plate is provided with a circle of guard which protrudes out of the bottom surface of the base plate along the periphery of the process hole. The refrigerator can prevent a test finger from touching the wiring harness on the wire fastener in a test, thereby eliminating potential safety hazards.

Parallel data free assistant clock recovery method and system

The invention relates to parallel data free assistant clock recovery method and system. The method comprises the steps of: storing received data in an RAM or FIFO; executing a parallel cyclic Gardner algorithm while storing the data in the RAM, reading the data from the RAM for carrying out clock recovery; executing the parallel cyclic Gardner algorithm, reading the data from the FIFO for carrying out the clock recovery; and outputting the final clock recovery data. The method and the system are suitable for a wireless burst communication system, can meet the processing requirement for high-speed and large data volume, rapidly complete the clock recovery under a burst communication mode, and overcome the defects of the prior art.

Infrared remote sensing image runway detection method based on YOLO v3-tiny

The invention relates to an infrared remote sensing image runway detection method based on YOLO v3-tiny. The method comprises the following steps: constructing an infrared remote sensing airport runway image data set; determining a training set and a verification set, and marking the training set and the verification set; a YOLO v3-tiny detection model is established; setting network parameters; a YOLO v3-tiny detection model is trained; based on a pre-training model of a line segment detector, using an M-LSD algorithm to extract a runway contour line in a target frame: inputting an image of the target frame where the runway is located into a feature extraction network of the M-LSD, extracting features through a feature map, and visualizing the runway contour; carrying out line segment detection to obtain detected runway edge line segments, then carrying out sorting fitting on the runway edge line segments, and carrying out distortion correction on the runway according to edge angular points ...

AB (polyamide 6 and polybutylece terephthalate) high-elasticity composite yarn comprising superfine fibers and method for processing AB high-elasticity composite yarn

The invention relates to an AB (polyamide 6 and polybutylece terephthalate) high-elasticity composite yarn comprising superfine fibers and a method for processing the AB high-elasticity composite yarn. The composite yarn comprises a PA6 (polyamide 6) inner core and a PBT (polybutylece terephthalate) covering layer extruded on the outside of the PA6 inner core. The section of the PA6 inner core is 'star'-shaped. The method includes processes of 1), drying slices; 2), filtering melts; 3), compositely spinning the melts; 4), stretching the composite yarn and improving the elasticity of the composite yarn.

Navigation positioning method

The invention discloses a navigation locating method, including the following steps: a digital terrestrial television launcher sends out digital television signals carrying navigation information; a user receiver receives a plurality pieces of navigation information sent by a plurality of digital terrestrial television launchers for pseudo-range measurement one by one; the user receiver carries out location according to the measured pseudo range and the corresponding digital terrestrial television launcher. The invention also discloses a combination locating method adopting the digital television signals and navigation satellite signals. The invention adopts the digital terrestrial television launcher to realize the navigation locating function independently or adopts both the digital terrestrial television launcher and a navigation satellite to realize the navigation locating function together in virtue of the digital terrestrial television broadcast standard signals carrying the navigation ...

Refrigerator

The invention discloses a refrigerator which comprises a bottom foot mounting structure. A bottom foot is arranged to be in the form of a sleeve. The two opposite sides of the top edge of the sleeve are respectively provided with a clamping hook which faces outwards. A bottom foot base which protrudes downwards is arranged at the mounting position, corresponding to the bottom foot, of a refrigerator base plate. The bottom foot is mounted on the bottom foot base in a sleeved mode. Clamping grooves are formed in the refrigerator base plate and located in the positions corresponding to the clamping hooks on the two sides of the bottom foot. The bottom foot is correspondingly and fixedly clamped in the clamping grooves through the clamping hooks on the two sides, and then the bottom foot is fixed to the bottom foot base in a sleeved mode. According to the refrigerator, the assembly process of a refrigerator base can be completed quickly, so that time and labor are saved.

DC asynchronous motor universal vector control method and controller

The invention relates to a DC asynchronous machine universal vector control method which is characterized by comprising the following steps of: firstly storing parameters required to be regulated aiming at different controlled electric motors in vector control in an EEPROM of an SPI interface; when a controller is started, firstly reading the correlation parameters stored in the EEPROM for vector control. When the motor needs changing, the controller is connected with PC through an adapter; the parameters in the EEPROM are modified through serial debugging software by applying a corresponding instruction of the adapter; the invention can very conveniently and quickly modify and regulate the corresponding parameters of the motor and the vector controller.

Mini stepper capable of generating electricity

Provided is a mini stepper capable of generating electricity. The mini stepper capable of generating the electricity comprises a base, wherein a connecting shaft is arranged on the base, a left pedal and a right pedal are connected through the connecting shaft, the lower ends of the pedals are connected with pistons, the pistons move in cylinder bodies respectively, and a large shaft is connected with the base. The two cylinder bodies are communicated through a cavity formed in the base, vertical movement of the pedals is achieved through gas exchange between the cylinder bodies, the structure is simple, the manufacturing cost is low, and the weight is light. A gas pressure adjusting device is arranged in the middle of the base, a gas flowing monitoring device can be arranged in the middle of the base, display screens are arranged on the pedals respectively, the frequency of movement can be displayed, and a user can learn about the quantity of motion. Springs are arranged between the lower ...

Telescopic safety channel for tunnel

The invention relates to the technical field of safety channels, and provides a telescopic safety channel for a tunnel, which comprises a first pipeline and second pipelines, the second pipelines are provided with rack parts, the two ends of the first pipeline are slidably provided with the second pipelines, and the second pipelines extend into or out of the second pipelines after sliding. The rack part is arranged on the first pipeline, a gap is formed between the first pipeline and the second pipeline, the limiting wheels are rotationally arranged on the first pipeline and abut against the second pipeline, the driving gear is rotationally arranged on the first pipeline and is meshed with the rack part, and the driving gear and the limiting wheels are both located in the gap. By means of the technical scheme, the problems that in the prior art, alignment of pipeline connectors of a rigid safety channel is difficult to achieve, and in the step-by-step construction stage, if the safety channel ...

Tapered cylindrical membrane electrode for oxyhydrogen proton exchange membrane fuel cell

Parallel carrier recovery method without data assistance and system thereof

The invention relates to a parallel carrier recovery method without data assistance and a system thereof. The method comprises the steps of: storing the received data in an RAM (Random Access Memory) and an FIFO (First Input First Output); performing the first parallel carrier recovery algorithm at the same time when the data is stored in the RAM, and reading data from the RAM for carrier recovery; performing the second parallel carrier recovery algorithm, and reading data from the FIFO for carrier recovery; and outputting the final carrier recovery data. The method and the system thereof are applicable to a high-speed wireless burst half-duplex communication scene with a short protection interval before the data is effective by adopting a manner of first storing and then processing, can meet the processing requirements for high speed and large data amount, and can rapidly complete carrier recovery in a burst communication mode.

Method for quickly detecting quality of gravel pile

The invention relates to a method for quickly detecting the quality of a gravel pile, which comprises the following steps: the process for carrying out a heavy dynamic penetration test (DPT) on a pile body comprises the following steps: in the heavy dynamic penetration test, by using a power hammer of which the weight is 63.5kg and the drop height is 76cm and using a cone head as a penetration head, carrying out continuous heavy dynamic penetration tests along the depth direction of the pile body, recording the actually measured hammering number when the pile body is penetrated for every 10cm, correcting the hammering number, and then, determining the bearing capacity (kPa) of the foundation according to the corrected heavy cone dynamic penetration hammering number N63.5; and the process for carrying out a standard penetration test (SPT) comprises the following steps: by using a punching hammer of which the weight is 63.5kg and the drop height is 76cm, punching a standard penetrometer into ...

Ware is accomodate to multi -purpose pencil

The utility model discloses a ware is accomodate to multi -purpose pencil contains an annular flat solid fixed ring, solid fixed ring's inner wall on be equipped with the end of a thread checkpost ofa pair of " C " font, solid fixed ring on be equipped with a plurality of mobile fixed holding strips, the head of fixed holding strip be equipped with the banding holding strip main part of a pair oflength, the afterbody of fixed holding strip be equipped with a slide hole, the inner wall of holding strip main part on be equipped with a plurality of anti -skidding teeth suddenly, the head of holding strip main part be equipped with a locking pothook respectively. During the use, the user is direct with the pencil, for example the earphone pencil twines along solid fixed ring's circumferenceto pencil after will twining directly blocks between the holding strip main part, and is last, will fix the locking pothook of holding strip and withhold the locking, fixed totally with the pencil. Itis last ...

AB high-elasticity superthin fiber composite filament

The invention relates to an AB high-elasticity superthin fiber composite filament which comprises a PA6 inner core and a PBT coated layer wrapped outside the PA6 inner core in an extruded manner. The section of the PA6 inner core is star-shaped. The AB high-elasticity superthin fiber composite filament is simple in structure, good in rebound resilience, high in tenacity and saving of production cost.

Method and system for non-data-aided synchronization of wireless burst communication all-digital receiver

The invention discloses a method and a system for non-data-aided synchronization of a wireless burst communication all-digital receiver. The method comprises the following steps that: an energy detection module takes M sample data as a group to calculate energy sum, when the energy sum detected for successive N times is more than or equal to a preset threshold, data effective signals and effective data in the sample data are output, and until the energy sum of the sample data detected for the successive N times is smaller than the preset threshold, the data effective signals and effective data are stopped outputting; a clock recovery module stores the effective data, utilizes the effective data for clock recovery and transmits the effective data to a carrier recovery module; and the carrier recovery module stores the data after the clock recovery and utilizes the data for carrier recovery. The method adopts a mode of storing first and then treating, and repeatedly utilize limited data between ...

Power battery management method and device

The invention relates to a power battery management method and device. The management method comprises the following steps: the power battery is divided into an upper management layer and a lower protection layer, wherein the lower protection layer is used to collect the voltage of single battery cell, if the voltage is more than a preset value v3, an equalization circuit is opened, if the voltage is also more than a preset value v4, an overcharge protection circuit is opened and data is recorded, the battery cell replacement scheme is analyzed; and if the voltage is less than a preset value v2, a compensating circuit is opened, if the voltage is also less than a preset value v1, the overcharge protection circuit is opened and data is recorded, and the battery cell replacement scheme is analyzed, wherein the v4>v3>v2>v1. The method of the invention can protect the power battery from overcharging, overdischarging and overcurrent, accurately estimate SOC value, realize CAN bus communication ...

Parallel folding-RS cascade coding method and realizing device thereof

The invention discloses a parallel folding-RS cascade coding method and a realizing device thereof. The method comprises the following steps of: S1, blocking the received Nin path input data into folding coding frame as the input of the parallel folding coding; S2, performing parallel winding coding on the folding coding frame output in the step S1 and outputting valid data in the folding coding frame; S3, combining multi-path output of the parallel folding coding into one path of data and outputting the data in parallel by taking a field as a unit, wherein the bit width of the field is NRS bit; S4, searching the field on the initial position of a frame synchronous identifier word in the data output in the step S3 as well as the position in the field, outputting RS signal frame body data and identifying the initial position of the frame body; S5, descrambling the data output in the step S4 in parallel; and S6, performing symbol-solving interlacing and RS coding on the data descrambledin ...

Data transmission method of wireless bursty communication, system and channel equalization method

The invention relates to a data transmission method of wireless bursty communication, a system and a channel equalization method. The data transmission method includes the following steps: framing data to be transmitted to obtain a signal frame that is to be transmitted and consists of a frame header and a frame body; and conducting final treatment and transmitting the signal frame to be transmitted, wherein the frame body consists of frame body cyclic prefix and data to be transmitted. By adopting PN training sequence with the cyclic prefix, the methods and the system realize the unbiased estimation of channel parameter and use the transmitting data with the cyclic prefix but not the hangover of the transmitting data to complete frequency domain equalization, thus avoiding the unfavorableeffect on equalization caused by an automatic gain control unit.

Power maintenance hoist

The utility model relates to a power maintenance hoist, including chucking device, entablature, cable wire, bottom end rail, cylinder body, piston, cylinder body, manometer, hydraulic pump, electricalcontrol cabinet and anchor head, the chucking device with the cable wire chucking on entablature and bottom end rail, the cable wire top is fixed on supporting beam, the cable wire bottom is passed through the anchor head and is fixed in the heavy object bottom, the cylinder body is installed on the bottom end rail, the piston is installed in the entablature bottom, and the piston is connected with the cylinder body, cylinder body while and manometer and hydraulic pump connection, the hydraulic pump is connected with electrical control cabinet, the utility model discloses a hoist security performance is high, and convenient operation should use widely.

Multi-site bus combination method and device of electrical vehicle

The invention relates to multi-site bus combination method and device of an electrical vehicle. The invention is characterized in that an Ethernet bus, a CAN bus and an LIN bus are used for forming a multilayered distributed bus system; entertainment equipment with larger communication data volume is mounted on an Ethernet bus layer; electronic equipment with relatively low communication speed and a saddle module are connected to a CAN bus layer; data communication is carried out between the Ethernet bus and the Can bus through a full-vehicle control system; and the data communication is carried out between the CAN bus and the LIN bus through a CAN-LIN gateway. On the basis of meeting the requirement for the construction of a full-vehicle control network of an electrical vehicle, different equipment communication requirements are layered, and the bus advantages of different sites are combined, which guarantees communication requirements, the communication efficiency and the stability of ...

Tapered cylindrical membrane electrode for oxyhydrogen proton exchange membrane fuel cell

The invention discloses a tapered cylindrical membrane electrode for oxyhydrogen proton exchange membrane fuel cell, which is characterized by comprising an anode in contact with hydrogen, a composite membrane and a cathode in contact with air from inside to outside; the composite membrane is composed of a proton exchange membrane (which usually is a Nafion membrane), an output joint is arranged at a anode plate, a seal ring used for isolating the anode output joint from the composite membrane and the cathode is arranged at the anode output joint and a cathode output joint is arranged at the bottom of the cathode; and the anode is in a cone shape, the composite membrane is in a cone shape matched with the cone shape of the anode, the cathode is a hollow pipe, the outside surface of the cathode hollow pipe is cylindrical and the inner hole of the cathode hollow pipe takes a shape of a cone hole with the same conical degree as the cathode. In the invention, the structure is reasonable and ...

Automobile liquid pump

The invention discloses an automobile liquid pump. The automobile liquid pump comprises an upper cover. The upper cover comprises a baffle and a sealing ring. A liquid column is arranged on the baffle. An outwards-protruding convex surface or an inwards-sinking concave surface is arranged on the outer circumferential surface of the liquid column. A liquid opening penetrating through the baffle is formed in the convex surface or the concave surface. The liquid column is sleeved with the sealing ring, and the sealing ring is located on the convex surface or the concave surface to seal the liquid opening. The automobile liquid pump has the advantages that the liquid opening can be prevented from being blocked by foreign matter and is good in sealing performance.

Transport vechicle hookup subassembly

The utility model discloses a transport vechicle hookup subassembly, transport vechicle hookup subassembly includes: the seat frame, be equipped with on the seat frame and link up along the fore -and -aft direction the through -hole of seat frame, be equipped with the edge on the wall of through -hole the first slot part of the circumference extension of through -hole, the bearing inner circle, be equipped with the edge on the outer peripheral face of bearing inner circle the second slot part of the circumference extension of bearing inner circle, the roll quality body, the roll quality body is established the seat frame with between the bearing inner circle, partly cooperation of the roll quality body is in in the first slot part, another part cooperation of the roll quality body is in in the second slot part. According to the utility model discloses transport vechicle hookup subassembly has convenient, the advantages such as intensity is high, good reliability of equipment.

Carrier vehicle coupling assembly

The invention discloses a carrier vehicle coupling assembly. The carrier vehicle coupling assembly comprises a seat frame, a bearing inner ring and a rolling mass body, wherein a through hole which penetrates through the seat frame in the anterior-posterior direction is formed in the seat frame; a first slot part which extends in the peripheral direction of the through hole is arranged on the wall of the through hole; a second slot part which extends in the peripheral direction of the bearing inner ring is arranged on the peripheral surface of the bearing inner ring; the rolling mass body is arranged between the seat frame and the bearing inner ring; one part of the rolling mass body is fitted in the first slot part; and the other part of the rolling mass body is fitted in the second slot part. According to the embodiment of the invention, the carrier vehicle coupling assembly has the advantages such as convenience in assembling, high strength, good reliability and the like.

Channel estimation method applicable to wireless burst communication, and system thereof

The invention discloses a channel estimation method applicable to wireless burst communication, and a system thereof. The method comprises the following steps: emitting a signal frame consisting of a pseudo-random sequence frame head with a cyclic prefix and a frame body in a burst form; performing clock recovery and carrier recovery on the signal frame; performing relevant operation on the signal frame to find an initial position of a pseudo-random sequence; and utilizing the received pseudo-random sequence to perform channel estimation so as to obtain channel parameters. The invention realizes unbiased estimation of the channel parameters by properly designing the structure of the frame and utilizing the pseudo-random sequence with the cyclic prefix, can realize the multiplication and inversion of matrixes only through addition and shift operation by properly selecting channel length, and is simple in operation and easy to realize on hardware.