55 results about "Supersonic waves" patented technology

The invention discloses a fuel cell heat and humidity integrated management system and an evaporation phase change cooling method thereof, and belongs to the technical field of fuel cell heat management. The system comprises an air cooling and humidifying module, a heat dissipation, evaporation and phase change module and a water recovery and distribution module. The air cooling and humidifying module distributes compressed air to an ultrasonic atomizing nozzle to be mixed with atomized water, and cooling and humidifying of main path air are achieved. The heat dissipation evaporation phase change module sprays atomized water to the surfaces of ATS radiator fins, and heat dissipation is enhanced through evaporation phase change. And the water recovery and distribution module recovers moisture in wet air at an electric pile outlet through condensation and intelligently distributes the moisture to the two atomization systems. A traditional intercooler and a traditional membrane humidifier are omitted, the air flow resistance is reduced by 15-20%, the heat dissipation efficiency is improved by 10% or above, the weight of the system is reduced by 8%, closed-loop utilization of reaction water is achieved, and the system is particularly suitable for fuel cell systems of mobile carriers such as vehicles and unmanned aerial vehicles.

The invention discloses a liquid-phase sweating cooling thermal protection structure based on atomization jet flow, and relates to the field of heat reduction and resistance reduction of active flow control of aerospace high-speed aircrafts, the liquid-phase sweating cooling thermal protection structure comprises a coolant cabin, and cooling spray holes are formed in the cabin wall of the coolant cabin; an atomization vibrating body is fixedly connected to the position, located at the cooling spray hole, of the cabin wall of the cooling agent cabin, the atomization vibrating body can make contact with a cooling agent in the cooling agent cabin, and a driver used for enabling the atomization vibrating body to vibrate is further included. The liquid-phase sweating cooling device works on the basis of the ultrasonic atomization principle, through the effect of the piezoelectric ceramic atomization piece, the liquid coolant generates atomization jet flow and enters a boundary layer outside the aircraft, use of a liquid pumping driving device is avoided, and the light weight degree of the liquid-phase sweating cooling device is improved.

The invention discloses a machining device for a complex curved surface safety filter screen of an aircraft hydraulic system, and relates to the technical field of aerospace non-traditional machining equipment.The machining device comprises a phase transformation chuck assembly, the working surface of the phase transformation chuck assembly is composed of a magneto-rheological elastomer, and the magneto-rheological elastomer can be in a flexible state when no magnetic field exists; and when a magnetic field is applied, a rigid state is presented. By utilizing the field-induced phase change characteristic of the magneto-rheological elastomer, the magneto-rheological elastomer can be used as a flexible shaping device to copy the accurate negative shape of the mounting base without stress, and can also be used as a rigid clamp to firmly maintain the shape, so that the assembly error caused by inconsistent reference in the traditional processing is eliminated. And the stress deformation in the machining process of the thin-wall workpiece is greatly inhibited by integrating a resonant stripping machining structure and utilizing a micro stripping effect generated by high-frequency micro-amplitude vibration of the ultrasonic tool bit. And through cooperative control, a whole-process closed-loop manufacturing normal form is formed. And the machining precision and the machining consistency are improved.

A wing structure for a supersonic aircraft including a pair of supersonic wave-tripping channels formed on each of two laterally extending wings of the supersonic aircraft, wherein each of the pair of supersonic wave-tripping channels extend in a span-wise direction of the wings respectively, wherein an upper supersonic wave-tripping channel of the pair of supersonic wave-tripping channels is disposed on an upper surface of each of the wings and a lower supersonic wave-tripping channel of the pair of supersonic wave-tripping channels is disposed on a lower surface of each of the wings, wherein the upper supersonic wave-tripping channel and the lower supersonic wave-tripping channel are set back from a leading edge of the wings respectively.

The invention provides a preparation method of niobium-chromium intermediate alloy powder, which comprises the steps of niobium block cutting, alkali liquor cleaning, ultrasonic cleaning, Nb and Cr mixed smelting, cooling in a crucible and powder preparation, and Cr2Nb alloy powder for high-temperature niobium-based alloy is obtained.According to the method, the intermediate alloy comprising 62.8-69.2 wt% of Nb and 30.8-38.2 wt% of Cr is directly prepared by adopting a smelting method in combination with actual requirements and application, and the niobium-chromium intermediate alloy can be used for preparing the high-temperature niobium-based alloy. The prepared niobium-chromium intermediate alloy has the advantages of high melting point, low density, excellent high-temperature creep property and the like, and can be used for preparing novel high-temperature structural materials such as aero-engines.

The utility model relates to a helicopter external load gravity center dynamic adjustment balancing structure which comprises a helicopter mounting plate, a dismounting structure and a balancing assembly, a sliding block at the bottom of a first moving guide rail drives a first empty box to move, and a sliding block at the bottom of a second moving guide rail drives a second empty box to move. Water in the water tank is guided into the first empty box through the first pump body, water in the water tank is guided into the second empty box through the second pump body, the water amount in the first empty box and the water amount in the second empty box are monitored through the corresponding ultrasonic flow meters, and the positions of the first empty box and the positions of the second empty box are adjusted according to use requirements. The weight of the first empty box and the second empty box is adjusted according to use requirements, gravity center dynamic adjusting and balancing work is completed, the flight gravity center is kept stable, safety is improved, the balance weight position is adjusted by using water as an adjusting medium and moving a guide rail, the burden of the whole aircraft body is reduced, production is simple, production cost and maintenance cost are low, practicability is good, and overhaul and replacement are convenient.

The application discloses a longitudinal tension test load device for a super-large tonnage hook and a test method, which comprises a foundation bearing platform, the top surface of the foundation bearing platform is provided with a load test cabin body, and the top surface of the load test cabin body is fixedly installed with a plurality of hoisting lug seats for hoisting. Through mutual cooperation of a servo driving motor, a precision ball screw, a longitudinal sliding base, a main loading hydraulic cylinder, an adjustable support frame, a sliding bearing frame, a main locking connecting rod, a connecting rod support frame, a gear transmission block, a sector meshing gear, a driven connecting rod mechanism, a self-adaptive clamping module, a lateral installation flange and a self-locking limiting plate, the position of the adjustable support frame on the hook claw can be adjusted for multiple tests, an industrial endoscope can detect cracks on the surface of the hook during the test process, a laser displacement sensor can monitor the deformation of the hook claw, and a worker can use an ultrasonic flaw detector to detect the hook, so that the test effect of the hook is achieved.

The utility model belongs to the technical field of aero-engine maintenance, and particularly relates to an aero-engine fuel nozzle ultrasonic cleaning device which comprises a cleaning device body, and an auxiliary cleaning mechanism is arranged in the cleaning device body. The auxiliary cleaning mechanism comprises rollers, and the rollers are connected to the inner wall of the cleaning device body through rotating shafts; the rotating gears are connected to the two ends of the surface of the roller in a sleeving mode correspondingly; the servo motor is fixedly installed on the rear side of the cleaning device body, and an output shaft of the servo motor penetrates into the cleaning device body and is fixedly connected with the roller on one side; and the conveying toothed belt is connected to the surface of the rotating gear in a meshed mode and rotationally connected to the inner wall of the cleaning device body. According to the ultrasonic cleaning device for the fuel nozzle of the aero-engine, the fuel nozzle of the engine can be rotationally cleaned, ultrasonic waves and cleaning liquid can make contact with each part of the fuel nozzle more comprehensively, and thorough cleaning is guaranteed.

The invention relates to the technical field of humidification, in particular to a drawer type water tank, an upper water adding humidifier provided with the drawer type water tank and a zero-stale-water control method for controlling the humidifier. Compared with the prior art, the drawer type water tank can be inserted into the humidifier or pulled out of the humidifier, and due to the structure that the top face is open, water body replacement and water tank cleaning are very convenient and fast; the air inlet and the air outlet are provided with net structures, so that air and water are permeable, and foreign matters and mosquitoes can be prevented from entering the humidifier to pollute water; the humidifier does not need to be shut down in the upper water adding operation, and upper water adding can be conducted through the air outlet in the humidifying process; the fan guides the air flow to carry, dilute and output water vapor generated by the humidifying device, so that the problems of floor wetting and condensate water noise caused by air flow humidity supersaturation are solved; the zero stale water control method ensures that fresh water is used in the humidification operation. The air humidifier is suitable for three mainstream air humidification technologies of a cold evaporation type, a heat evaporation type and an ultrasonic wave type at the same time, reuse of the structural design of the humidifier can be achieved, intergenerational innovation and standardization of the humidifier industry are promoted, and sale, popularization and application of the humidifier are promoted.

This utility model discloses a cleaning device for manufacturing and processing aerospace aluminum alloys, including a hoisting frame and a rope structure capable of scraping the surface of aluminum alloy square tubes. The hoisting frame has internally fixed separators for arranging the aluminum alloy square tubes in layers. Drive structures are installed on both sides of the hoisting frame to propel the rope structure through the layers of aluminum alloy square tubes. The outer wall of the rope is fixed with bristles, and both ends of the rope are provided with connecting structures for connection to the drive structure. This utility model uses a serpentine arrangement of double steel wire ropes to drive multiple sets of parallel ropes to reciprocate between the profile layers. Through continuous scraping of the profile surface by the bristles, the efficiency of ultrasonic cleaning fluid in removing oil and residue is improved. It is particularly suitable for long aerospace aluminum alloy profiles. Compared to traditional immersion cleaning, this device can solve the problem of insufficient contact during hoisting and cleaning of long aerospace aluminum alloy profiles.

The invention discloses a ship actual load ton continuous dynamic measurement system, which comprises a plurality of measurement devices, a cable, a pulley, a data collector and a data center, and is characterized in that an ultrasonic device and a pressure sensor are integrated in each measurement device. Core measurement components of the device are only an ultrasonic device, a pressure sensor and conventional data collector equipment; the overall cost is low and the economical efficiency is remarkable. According to the invention, the measurement device can be manually and directly controlled to be retracted and released from the ship deck without underwater operation or special hoisting equipment; the folding and unfolding operation is convenient, and the adaptability is high. Data can be collected in real time in the whole cargo loading and unloading process, real-time data support is provided for dynamic regulation and control of loading and unloading operation, and economic losses caused by loading and unloading weight deviation are avoided. According to the invention, a plurality of measuring devices are deployed along the transverse direction of the ship, the data center synthesizes the measurement data of each position, each subtle change of the real load ton is accurately captured, and the accuracy of the measurement data of the real load ton change is improved.

According to the portable connection repairing method, brazing of the SiCf / SiC ceramic-based composite material and the GH3030 nickel-based high-temperature alloy is achieved through Joule thermal shock, and the requirement for on-line temperature monitoring of an aero-engine is met. The method comprises the following steps: 1, earlier stage treatment of experimental materials: selecting a SiCf / SiC composite material (5 mm * 5 mm * 5 mm small cube) and a GH3030 high-temperature alloy (10 mm * 10 mm * 5 mm small cube); and the contact surface is mechanically polished, and the surface roughness Ra is controlled to be 0.2-0.5 micron. Ultrasonic cleaning liquid is used for cleaning the surface, oil stains, oxides and other impurities are removed, the cleaning time is 10-40 min, and the temperature is 20-70 DEG C. 2, a Joule thermal shock brazing process: designing a carbon fiber woven body composite TiNiNb electric heating middle layer, introducing a surface heat source by utilizing a carbon fiber Joule thermal effect, and covering the surface with an anti-oxidation active agent to inhibit oxidation; and in the current control mode, applying a direct current of 20-60A to the SiCf / SiC for 40-120s. Rapid Joule heating is triggered by the current, so that the filling metal is melted, and brazing connection is completed.

The application discloses a kind of plate ultrasonic wave regulation and control welding fixture, it is related to ultrasonic welding technical field, including welding table and the welding frame being set in the middle of welding table, the bottom four corners of welding table are supported by support column, control panel containing PLC control module is set in welding frame, the top of welding frame is equipped with welding module and welding adjustment module, welding module is set by welding adjustment module and moves horizontally on welding frame, two fixture drive modules are symmetrically set in the both ends of welding table, two fixture drive modules respectively control mobile clamping module and positioning clamping module to clamp plate, wherein the side of positioning clamping module is provided with size adjustment module for positioning the position of positioning clamping module.The application is set to size adjustment module to achieve the purpose of facilitating to adapt to different size plate welding, by setting mobile clamping module, it can prevent that clamping force is too large and damages plate.

This invention discloses a low-altitude hovering aircraft, comprising a fuselage, solar panels, an electromagnetic levitation module, a propellerless fluid propulsion system, and a sodium-ion battery pack. The fuselage integrates an intelligent flight control module, a positioning and tracking module, an ultrasonic anti-collision module, and a self-circulating charging module. The fuselage is an integrated, enclosed structure without wheels, wings, or propellers. The solar panels are mounted on the fuselage surface to convert solar energy into electrical energy for autonomous recharging. The electromagnetic levitation module is installed at the bottom of the fuselage to generate vertical levitation force. Through the design of the propellerless fluid propulsion system, there are no rotating blades or mechanically moving friction parts throughout the flight, eliminating wear and tear and reducing flight noise and fuselage vibration, achieving quiet low-altitude flight, complying with urban low-altitude noise control standards, and offering more environmentally friendly and stealthy operation.

The invention relates to the technical field of tail sealing, and discloses a machining device and method for ultrasonic tail sealing of an insulating heat-shrinkable tubing structure.The machining device for ultrasonic tail sealing of the insulating heat-shrinkable tubing structure comprises two air cylinders, a pressurizing plate and a right sealing plate, and the top of a bottom plate is fixedly connected with an arch plate; the two air cylinders are fixedly connected to the right side of the same arch plate, the output ends of the two bottom plates are fixedly connected with the same left sealing plate, the design is reasonable, through a pressure self-enhancement structure, the device overcomes the defect that due to the fact that the pressure of a traditional air cylinder is constant, the pressure is insufficient when materials are softened in the middle stage of tail sealing, and the device is suitable for large-scale production. The self-adaptive adjustment of the pressure is realized; through the end-capping self-checking structure, automatic judgment and sorting of the end-capping quality of the casing pipe, automatic collection of qualified products and automatic transfer of unqualified products are achieved, the labor intensity of workers is remarkably reduced, and the working efficiency of the device is improved.

The invention belongs to the technical field of channel bridge reinforcing construction methods, and particularly relates to a channel bridge reinforcing construction method which comprises the following steps: S1, channel bridge damage detection and positioning; s2, pre-treating a base layer at the damaged part of the channel bridge; s3, carrying out layered gradient reinforcement on the damaged part of the channel bridge; s4, performing intelligent stress monitoring on the damaged part of the channel bridge; s5, self-adaptive maintenance of the damaged part of the channel bridge, according to the overall structure provided by the embodiment of the invention, a collaborative reinforcement technology of accurate damage positioning, layered gradient reinforcement, intelligent stress monitoring and self-adaptive maintenance is provided, and the reinforcement process is accurate and intelligent through a damage grade evaluation formula and a maintenance parameter dynamic adjustment formula; the ultrasonic-assisted bonding and prestress tensioning technology is adopted, the bonding compactness of the CFRP cloth and the base layer is improved, stress concentration is avoided, the structural bearing capacity is improved by 30% or above, and the service life of the reinforcing layer is prolonged to 25 years or above; the layered gradient reinforcing technology simplifies the construction process, and the construction period is shortened by 20%.

This invention relates to the field of material strengthening technology, providing a surface composite strengthening coating and its preparation process. The invention involves ultrasonic CNC unmanned contact cleaning and polishing of the workpiece surface, followed by high-energy particle bombardment in a vacuum chamber to penetrate W and Mo elements into the workpiece matrix and reconstruct metallic bonds, achieving matrix strengthening. Subsequently, a micro-cladding bonding process is completed using an electron beam gun, and finally, a PECVD process is employed to deposit the coating. This invention, through the combination of matrix strengthening and surface coating, effectively improves the strength of the workpiece matrix and the adhesion of the coating, blocks the impact of broaching heat on the workpiece, significantly improves the workpiece's wear resistance and impact resistance, extends its service life, reduces the frequency of workpiece replacement and production costs, and is suitable for the processing needs of aircraft motion mechanisms and aero-engine parts.

The invention relates to the technical field of engine protective agent preparation equipment, and discloses an ultralow-friction nano-composite engine protective agent preparation device and method. The ultralow-friction nano-composite engine protective agent preparation device comprises a preparation rack, a pretreatment mechanism is arranged in the preparation rack, and a multi-stage treatment mechanism is arranged below the pretreatment mechanism; the pretreatment mechanism comprises a first mounting sleeve, the outer surface of the first mounting sleeve is fixedly connected with the inner wall of the preparation rack, and the inner wall of the first mounting sleeve is fixedly connected with a mounting rack plate. According to the preparation device and the preparation method of the ultralow-friction nano-composite engine protective agent, the pretreatment mechanism is arranged, base oil in the base oil treatment tank is heated to a proper temperature by utilizing two heating sleeves, and nano-particles in the nano-particle treatment tank are pre-dispersed by fixing a plurality of ultrasonic emulsification dispersers in the nano-particle treatment tank; the raw material conveying pump is controlled to prevent excessive or insufficient additives from affecting product performance, and the effect of improving the quality of the engine protective agent is achieved.

To provide a driving device for ultrasonic equipment capable of precisely operating ultrasonic equipment such as an ultrasonic motor at high speed.SOLUTION: An ultrasonic device driving device 100 includes a state measurement unit 30 that measures a plurality of operating states including the drive state of an ultrasonic motor 10, and a monitoring control device 60 that includes a learning unit 163 that undergoes deep reinforcement learning using the state measurement unit 30, and that generates a control signal by processing the operating state measured by the state measurement unit 30 in the learning unit 163, and the learning unit 163 learns to determine the output state so as to achieve a given target state.SELECTED DRAWING: Figure 1

The invention discloses aviation ground service equipment and a docking method, and relates to the technical field of aviation ground service equipment, and the method comprises the steps: obtaining a real-time distance based on ultrasonic ranging, and carrying out the three-stage speed control according to a distance threshold value. When the distance is smaller than a first distance threshold value, an accelerator is cut off, and the speed is reduced to tortoise speed; when the distance is smaller than a second distance threshold value, the speed is reduced to worm speed; a silicone rubber barrel is arranged at the front end of the docking platform, and a second range finder and a limit switch are arranged for close-range accurate monitoring and emergency braking; and through a differential control strategy, the method adapts to new energy and fuel oil driving equipment. By implementing the method, safe, standard and reliable butt joint of the ground service equipment and the aircraft is realized, the artificial acceleration risk is completely eradicated from the hardware level, a multiple safety protection mechanism is established, and the standardization degree of aircraft operation is improved.

The utility model relates to the field of mowers, and discloses an intelligent mowing robot which comprises a central control unit, a chassis control unit, a display control unit and a charging pile. The central control unit uses a front camera and a rear camera to collect data of lawns, boundaries and obstacles, integrates data of a gyroscope and a speedometer of the chassis control unit to complete map creation and updating of the mower, grassland travelable areas and obstacle recognition and avoidance, and completes autonomous navigation. The chassis control unit completes motion control, mowing and cutter height adjustment of the intelligent mower. The display control unit is used for inputting user information, displaying state information of the mowing machine and detecting information of obstacles in the front left and the front right of the mowing machine through ultrasonic waves. According to the utility model, the mowing task can be completed by autonomous mapping positioning and autonomous path planning of the mowing machine without wire embedding and RTK (Real-Time Kinematic) positioning.

The embodiment of the invention provides an ultrasonic machining robot and method for internal defects of a pipeline. The ultrasonic machining robot comprises a control system, a crawling robot, a mechanical arm, an ultrasonic generator and a transducer, wherein the crawling robot, the mechanical arm, the ultrasonic generator and the transducer are connected with the control system. The two ends of the mechanical arm are detachably connected with the crawling robot and the dexterous hand correspondingly. The ultrasonic generator is arranged on the mechanical arm; the transducer is arranged on the dexterous hand and used for converting electric energy generated by the ultrasonic generator into mechanical energy, and the mechanical energy is transmitted to the defect position in the to-be-machined pipeline through the dexterous hand so that the defect can be machined. According to the ultrasonic machining robot provided by the embodiment of the invention, ultrasonic waves are used for defect machining without direct contact with the inner surface of a pipeline, and damage to the pipeline is reduced; flexibility and adaptability are better, and the device can be suitable for various pipeline environments; and the internal defects of the pipeline can be accurately machined, and the machining efficiency and safety can be improved.

The utility model relates to the field of mariculture equipment, in particular to deep sea aquaculture net cage attachment cleaning equipment which comprises a hollowed-out protection frame, the protection frame is provided with a floating part, and an ultrasonic generator is arranged on the inner side of the protection frame; the cleaning equipment further comprises an anchoring part connected with the protection frame, and the anchoring part comprises a fixing anchor and a connecting part connecting the fixing anchor and the protection frame. The protection frame is a non-metal protection frame. The utility model has the advantages of simple structure and stable use, and effectively solves the existing problems.

An autonomous vehicle includes a chassis for housing an aircraft ground contacting structure (GCS) and one or more GCS coupling and lifting mechanisms, GCS securing mechanisms, drivetrain, batteries and a sensor stack for performing autonomous navigation. Further, the vehicle incorporates multiple sensors, such as high-resolution machine vision cameras, GPS modules, Lidars, ultrasonic range sensors, and radars. The sensors deliver spatial perception capabilities to the vehicle and feed relevant data to onboard computing units to achieve location-based navigation, precision alignment with aircraft, obstacle detection and collision avoidance capabilities. A series of batteries deliver power to all components, including but not limited to, motors, electromechanical units, onboard computers, sensors and any other component requiring electrical input. External ports allow the vehicle to recharge batteries after each utilization cycle without replacement. The vehicle is capable of recognizing its power state and can autonomously navigate to a base station and dock itself for charging.

The utility model provides rotor impeller cover hot air cold riveting equipment, which relates to the technical field of cold riveting welding, and comprises a bottom plate, the top of the bottom plate is fixedly connected with fixed screw blocks, and a sliding table cylinder is fixedly connected between the outer sides of the fixed screw blocks; a guide rail is fixedly connected to the top of the bottom plate, a moving block is slidably connected to the outer side of the guide rail, a mounting base is fixedly connected to the top of the moving block, and a part base is mounted at the top of the mounting base. The cold riveting power source air cylinder is started to push the fixing plate and the cold riveting pressing head to move, the cold riveting pressing head is made to punch parts and conduct riveting machining on the parts, after welding, the surface of a product is free of ultrasonic welding scratches and the phenomenon that a product body is shattered to be broken is avoided, particularly, bearing materials in a rotor body and the size of the welded product are easy to control, and the machining quality is improved.

The application relates to the technical field of marine special equipment, and discloses a polymetallic nodule mining vehicle, a collecting mechanical arm and a mineral collecting system. The polymetallic nodule mining vehicle comprises a plurality of special-structure crawler-type advancing subsystems, effectively disperses the grounding specific pressure of the mining vehicle, improves the traction force, reduces the disturbance to the soft seabed, ensures that the crawler system can adapt to the frequently fluctuating seabed terrain as much as possible, improves the terrain adaptability and obstacle crossing capability, and meanwhile, the buoyancy control hardware architecture of the crawler-type advancing subsystems which are constructed on the basis of vertical propelling propellers, ultrasonic distance sensors, processors and memories creates an effective and implementable hardware environment and software environment for the local buoyancy intelligent control of the special-structure crawler-type advancing subsystems.

The present invention discloses a liquid abrasive flow finishing method for the flow channel of an aircraft engine fuel nozzle. The method comprises the following steps: S1: installing the fuel nozzle in an abrasive flow fixture, disposing an upper flow-uniform grinding core in the inner hole of the fuel nozzle, and disposing a lower flow-uniform grinding core at the lower end of the fuel nozzle; S2: machining the fuel nozzle using a liquid abrasive flow, with a machining time of 40 to 60 seconds and a machining pressure of 7 to 8 MPa; S3: parts cleaning: ultrasonic cleaning for 45 to 50 minutes, with an equipment frequency of 50 to 60 Hz; S4: performance testing of the machined parts. The present invention proposes a liquid abrasive ratio and processing parameters suitable for the fuel nozzle orifice, which significantly improves the surface quality of the nozzle orifice and the performance of the fuel nozzle. The qualified rate of the fuel nozzle spray cone angle reaches 100%, the qualified rate of distribution unevenness increases from 0 to 60%, and the surface finishing consistency is good, effectively improving the atomization effect of the fuel nozzle and ensuring the ignition performance of the fuel nozzle.

The utility model relates to an automobile transmission hybrid power shifting fork which comprises a shifting fork body, a shifting fork shaft sleeve is fixedly installed on the shifting fork body, and an installation cylinder communicated with the shifting fork shaft sleeve is fixedly connected to the shifting fork shaft sleeve. A shifting fork shaft is inserted into the shifting fork shaft sleeve, and the shifting fork body can move in the axial direction of the shifting fork shaft; a corrugated groove is formed in the shifting fork shaft in the axial direction of the shifting fork shaft, a shifting fork self-locking pin is installed in the installation cylinder, and one end of the shifting fork self-locking pin is matched with the corrugated groove. The shifting fork has the advantages that the structure is simple, the design is reasonable, a single shifting fork piece is machined and formed at a time through CNC, and the machining precision is high; meanwhile, the transmission motor is connected with the screw rod, so that a hydraulic or mechanical transmission source is adjusted to be electrically driven, and electric control is realized; the fork feet are welded through wear-resistant plastic ultrasonic waves, noise is reduced, and the cost is lower than that of a traditional plastic coating process.