51results about How to "Exquisite design" patented technology

The utility model relates to low altitude economic flight data management storage technical field, and disclose a kind of safe for low altitude economic flight data management, including cabinet, password protection door and telescopic adjustable object plate, the sidewall of the cabinet is equipped with password protection door, the password protection door is rotatably connected with cabinet sidewall, and cabinet and password protection door inside are provided with multiple telescopic adjustable object plates of horizontal distribution, the utility model low altitude economic flight data management safe is cooperated by the internal structure of cabinet and multiple telescopic adjustable object plates, ensure that internal storage space can be freely adjusted, so that its space utilization rate is greatly improved, the telescopic structure of telescopic adjustable object plate simultaneously, the paper file on object plate is convenient to take and search, improve search rate.

The utility model relates to a wall seat structure for installing and fixing a sunshade, which belongs to the technical field of the sunshade and comprises an arm seat frame connecting piece, a transition connecting block is arranged at the front end of the arm seat frame connecting piece, and a bolt through hole connected with the arm seat frame connecting piece through a screw and nut structure is arranged on the transition connecting block. The arm seat frame connecting piece comprises an inserting block, an adjusting connecting block integrated with the inserting block is arranged at the front end of the inserting block, and a U-shaped fixing groove penetrating through the bolt is formed in the adjusting connecting block. The device has the characteristics of simple structure, convenience in installation and high structural strength. The wall body fixing part and the sunshade arm connecting part are connected through the movable transition pivot, so that angle fine adjustment after installation is achieved, and different sunlight irradiation angles or storage requirements are met.

The utility model provides an electronic mechanical braking device for a drive-by-wire chassis, and belongs to the technical field of vehicle braking. The electronic mechanical braking device comprises a braking caliper body assembly, a braking transmission assembly, a driving motor connecting assembly and a driving motor. The brake caliper body is a core part of the brake caliper body assembly, an arc-shaped face and a limiting face are arranged in the brake caliper body, and a driving motor connector is arranged at the tail of the brake caliper body. The brake transmission assembly comprises a nut piston sealing cover, a nut piston and a ball screw. The nut piston is provided with an arc-shaped surface, a limiting surface and a sealing groove; the driving motor connecting assembly comprises a spline groove flange plate and a driving motor fixing frame. The electronic mechanical braking device adopts a caliper body integrated configuration scheme, and has the advantages of compact structure, smooth transmission, quick response, high bearing capacity and the like. Meanwhile, the electronic mechanical braking device can adapt to driving motors of different specifications by adjusting the driving motor fixing frame and the spline groove flange plate, and the application scene of the electronic mechanical braking device is expanded.

The utility model provides a visual inspection device with multiple reverse surfaces, which relates to the technical field of visual inspection and comprises a supporting table, a conveying belt is mounted in the supporting table, fixing frames are mounted at two ends of the upper surface of the supporting table respectively, and a plurality of image collectors are mounted on one sides, close to the conveying belt, of the fixing frames respectively. An auxiliary mechanism is installed in the middle of the upper surface of the supporting table. According to the utility model, through the auxiliary mechanism, the first motor is utilized to drive the connecting block and the clamping frame to rotate, multi-surface reverse rotation of the material can be realized, all surfaces of the material can be detected by matching with the image collector on the fixed frame, the area of a product possibly having quality problems is fully covered, the defect of single-surface detection is made up, and the detection efficiency is improved. The product quality is ensured to be comprehensively controlled, and the detection comprehensiveness is effectively improved.

The application discloses a kind of inductor full-automatic production device, including rack, the shell conveying assembly for conveying is equipped on the rack, along the direction of movement of the conveying assembly, the capacitor loading assembly for loading capacitor band is sequentially equipped on the rack, the resistance loading assembly for loading resistance band and the IC band loading assembly for loading IC band are sequentially equipped on the rack, the welding assembly for welding the capacitor band, resistance band and IC band on the shell is further equipped on the rack.The beneficial effects of the application mainly include:high degree of automation, realize full-automatic capacitor, resistance and IC band cutting bending forming and welding, without manual operation throughout, so as to improve processing efficiency when mass production, at the same time, the technical effects of reducing labor cost, processing cost and labor intensity can make enterprises effectively utilize human resources, and collection is convenient.

An automatic counting, checking and collecting device comprises a supporting frame, a material distributing disc is fixed to the supporting frame, a rotating disc is arranged on the material distributing disc, a plurality of fan-shaped grooves with the same size are formed in the rotating disc, a plurality of containing holes used for containing products are formed in the fan-shaped grooves, the containing holes penetrate through the fan-shaped grooves, and the rotating disc is arranged on the supporting frame. A fan-shaped blanking hole corresponding to the fan-shaped groove is formed in the material distributing disc, a driving assembly for driving the rotating disc to rotate is arranged below the rotating disc, and a camera for scanning the number of products is further arranged above the rotating disc; the driving motor drives the rotating disc to improve the counting efficiency and accuracy, the counting scheme that the circular rotating disc tool is combined with the groove is matched with the camera for automatic scanning confirmation, the problems that manual counting is prone to fatigue and inattention are effectively solved, it is ensured that the counting result is accurate, and meanwhile the labor cost and the labor intensity can be reduced.

The utility model discloses a rapid round steel butt joint device which is mainly composed of a shell, clamping mechanisms symmetrically arranged at the two ends of the shell and a driving mechanism located in the shell. The clamping mechanism is connected with the shell in a sliding mode through a connecting sliding block and comprises a base fixed to the connecting sliding block, a lower arc-shaped base and an upper arc-shaped base on the base are connected in a hinged and threaded mode, and a clamping screw and an arc-shaped pressing block are arranged to stably clamp round steel. The driving mechanism comprises a driving rack fixed to the connecting sliding block, a driving gear meshed with the driving rack and connected with the driving rack through a rotating shaft, and a rotating disc. According to the device, through the ingenious structural design, on the aspect of butt joint precision, position deviation can be effectively reduced, the butt joint coaxiality of round steel is improved, and the high-end manufacturing requirement is met; in terms of working efficiency, the position of round steel can be rapidly adjusted, and working time is shortened; and in the aspect of safety, the round steel is prevented from sliding off, the device adapts to complex operation environments, and the remarkable application value in industrial production is achieved.

The utility model discloses an external solenoid valve for an adjustable damping shock absorber, which comprises a valve body, an accommodating cavity is arranged in the valve body, and a main valve core is arranged in the accommodating cavity; a clamping groove is formed in the inner side of the main valve element, a spiral spring is arranged in the clamping groove, the spiral spring abuts against the main valve element, and the other end of the spiral spring abuts against the valve body. An ejector pin is arranged on the valve body in a sliding manner; a valve seat is fixedly arranged at the end, away from the electromagnetic assembly, of the valve body, a valve port is formed in the valve seat, a valve hole is formed in the outer circumferential face of the valve body, and a runner between the valve port and the valve hole can be separated by a main valve element. The self-adaptive damping electromagnetic valve has the advantages of being exquisite in design, capable of achieving self-adaptive damping of fluid, simple and convenient to operate, stable and reliable. And meanwhile, the cylindrical end I and the cylindrical end II guide the movement of the ejector pin, and the convex end is arranged to limit the movement position of the ejector pin, so that the movement accuracy is ensured, and the accuracy is greatly improved.

The utility model discloses a novel light emitting photo frame refrigerator sticker, including refrigerator sticker photo frame main part, the bottom fixed setting of refrigerator sticker photo frame main part has conversion structure, the inside of refrigerator sticker photo frame main part is equipped with central processing structure, the top of central processing structure is equipped with light emitting structure, one side of light emitting structure is equipped with display structure, the utility model discloses a novel light emitting photo frame refrigerator sticker, and the functions such as photo frame display, refrigerator sticker adsorption, light emitting, identification decoration are integrated, as photo frame, can show the content such as photo, card, refrigerator sticker photo frame main part can be firmly adsorbed on the surface of refrigerator and other magnetically adsorbable surface, and the convenient display and use, the light emitting function can not only highlight the display content, but also can act as temporary lighting or atmosphere light source in dark environment, in addition, through the pin design, can also be worn as a badge on clothes, bag, satisfy the diversified use demand of user under different scenes, expand the applicable range.

The application discloses an outdoor display stand with intelligent wind-resistant rapid contraction function, belongs to the technical field of outdoor display equipment, and can be widely applied to outdoor scenes such as commercial advertisements, enterprise display and cultural communication. The display stand comprises a base, detachable support arms, a wind force self-adaptive turnover mechanism, a rapid descending linkage mechanism and replaceable display frames. When the wind speed sensor detects that the wind force is too large, the turnover mechanism is triggered to work, the elastic telescopic head compresses the spring to drive the display frame to rapidly turn from a vertical state to a horizontal state, and rapidly descend from the horizontal state to a vertical low position state. The display stand integrates wind-resistant rapid contraction control and modular design, is suitable for complex outdoor environments, widens the use range, improves the safety and the intelligent level, achieves the effects of good display effect, reliable structure and convenient use, and has good social and economic benefits.

The invention relates to the technical field of veterinary drugs, and particularly provides a polynucleotide molecule composition for preventing cat infectious peritonitis, a chimeric polynucleotide molecule and an mRNA vaccine. In order to overcome the ADE effect caused by S protein full-length antigen in the prior art, FIPV N protein without ADE risk is adopted and is combined with screened S protein specific T cell and B cell epitopes. Core schemes include two classes: one is a separate polynucleotide composition comprising epitope peptides encoding N and S proteins; and 2, a single chimeric polynucleotide encoding N protein and S protein epitope peptides. The polynucleotides are optimized by codons and encapsulated in lipid nanoparticles (LNP) to prepare vaccines. Experiments prove that the vaccine can synergistically stimulate powerful immune response, the survival rate of immune cats is remarkably increased to 80%-100% from standard 40% on the premise that ADE is not caused, and FIP is effectively prevented.

This utility model discloses a fully automatic riveting and dispensing device, including a frame with a carrier for supporting the workpiece on the frame. A movable block, movable vertically relative to the carrier, is located directly above the carrier. A column is fixed to the bottom of the movable block, and a magnet is fixed to the bottom of the column. The bottom of the magnet has a receiving groove adapted to the head of the rivet. A through groove is formed on the column, one end of which connects to an inlet on the movable block, and the other end connects to an outlet on the magnet. The diameter of the outlet is smaller than the diameter of the rivet head. The advantages of this utility model are mainly reflected in its ingenious design. The magnet attracts the rivet, preventing accidental drop during riveting and improving riveting accuracy. After riveting, the workpiece is dispensed with glue through the inlet, through groove, and outlet. This dispensing method is simple and convenient, eliminating the need to transfer the workpiece and improving work efficiency.

The utility model discloses a new kind of flaw detection detection device for automobile turbine shaft, including flaw detector body, the left end fixed mounting of flaw detector body has detection head, the outside sleeve of flaw detector body left end has fixed frame, the fixed frame adopts two parts to be made of, and the connecting portion of right side is connected through the cooperation of connecting plate and screw fixing part.

The invention is suitable for the technical field of automobile aerodynamics, and provides a self-adaptive flexible spoiler experimental development method under a yaw working condition, and the method comprises the steps: arranging and driving a flexible spoiler in a wind tunnel; the parameters of the spoiler are optimized with the wind resistance coefficient as the target at the multiple yaw angles; designing a piecewise linear rule controller based on an optimization result; pressure monitoring points are arranged on the two sides of a vehicle body, the regression relation between the pressure difference and the yaw angle is established, and the yaw angle is recognized in real time; developing a self-adaptive resistance reduction optimization program, driving the spoiler to be adjusted to the optimal form in real time according to the identified yaw angle, and verifying the resistance reduction effect of the spoiler; a mathematical method is used for calculating the curved surface shape of the spoiler, and reference is provided for automobile appearance design. Aerodynamic configuration self-adaptive adjustment of the vehicle under the crosswind working condition can be achieved, the wind resistance optimization capacity of the real vehicle in the running process is remarkably improved, and an effective experimental method and design basis are provided for low-wind-resistance development of the vehicle.

The utility model belongs to the technical field of packaging barrels, and particularly relates to a coating packaging barrel which comprises a barrel body, a sealing mechanism is arranged at the top of the barrel body, a stirring mechanism is arranged in the middle of an inner cavity of the barrel body, and handles are arranged on two side walls of the surface of the barrel body. The sealing mechanism of the coating packaging barrel is exquisite in design. A pressing sealing groove in the annular track plate is matched with a sliding supporting block at the bottom of the sealing cover in an inserted mode, a sealing gasket is arranged in the pressing sealing groove and makes contact with the sliding supporting block in a pressing mode, and paint leakage and external air entering can be effectively prevented. Meanwhile, the fastening bolt at the top of the positioning rod is connected to the sealing cover through the sealing gasket, the sealing effect is further enhanced, it is guaranteed that the quality and performance of the coating in the barrel are not affected, and the storage life of the coating is prolonged.

The utility model discloses a full-automatic quick change type intelligent dining table which comprises a table body, a winding assembly and an unwinding assembly, the winding assembly and the unwinding assembly are arranged on the end sides of the table body respectively, each winding assembly and each unwinding assembly comprise a support fixedly arranged on the end face of the table body, a fixing plate is fixedly arranged on one side of each support, and a bearing roller used for bearing a tablecloth roll is arranged on each fixing plate in a pivoted mode. The outer circumferential surface of the bearing roller is positioned below the upper surface of the table body; a movable plate is movably arranged on the other side of the support and can be locked on the support through a locking assembly, a limiting block is arranged on the movable plate in a pivoted mode, the central axis of the limiting block and the central axis of the bearing roller are coaxial, and at least part of the limiting block can extend into the tablecloth roll. The tablecloth roll replacing device has the advantages that the design is exquisite, the tablecloth roll arranged on the bearing roller in a sleeving mode can be rapidly replaced by opening or closing the movable plate, the operation is simple and convenient, and the working efficiency is greatly improved. In addition, the limiting block can be connected to the tablecloth roll in a clamped mode, the tablecloth roll is accurately positioned on the bearing roller, and therefore the follow-up winding accuracy is ensured, and efficient and accurate winding is achieved.

This utility model relates to the field of waterproof membrane testing technology, specifically disclosing a waterproof membrane thickness testing device, including a support frame for support, a winding assembly disposed on one side of the support frame, and a testing component mounted on the winding assembly. The winding assembly includes a winding rod and a movable rod. A pulley and a drive motor mounted on the bottom of the pulley are disposed at the bottom of the winding rod. The drive motor is mounted inside the support frame. This utility model uses a flaw detector (such as an ultrasonic flaw detector) to test the waterproof membrane. This flaw detector utilizes the principle of ultrasonic waves propagating in different media and reflecting at interfaces, accurately measuring the thickness of the membrane without damaging it. This avoids the inaccurate test results caused by traditional testing methods that damage the outer surface of the membrane and have difficulty controlling the degree of damage. It can accurately measure the thickness of the membrane and detect internal defects such as bubbles and cracks, greatly improving the comprehensiveness and accuracy of the testing.

This utility model discloses a multi-core high-voltage connector, including a socket assembly fixed on a PCB board at the device end. The socket assembly includes a socket housing and a male terminal, one end of which is fixed on the PCB board. One end of the socket assembly is provided with a plug assembly, which includes at least a plug housing. The plug housing has an integrally formed mating end, a fixing end, and a receiving end. The mating end has a built-in connector that plugs into the male terminal. The fixing end is fixed to a panel on the device end. The receiving end has a built-in cable electrically connected to the connector. The other end of the plug assembly is provided with a locking component for securing the cable thereon. The advantages of this utility model are mainly reflected in: locking the plug assembly to the device end with locking bolts and fixing the socket assembly to the device end with the male terminal are simple, convenient, stable, and reliable, greatly improving work efficiency and effectively preventing the socket assembly and plug assembly from being too tight or too loose.

This utility model relates to the technical field of slitting devices for aviation polyurethane protective films, and more particularly to a slitting device for aviation polyurethane protective films, including a device body. The design of the slitting components is extremely ingenious. A motor drives a rotating shaft, causing gears to drive the pressure rollers to rotate in three directions, stably pressing and guiding the protective film to ensure a flat film during slitting. An electric push rod precisely controls the mounting carriage, which in turn drives the slitting blade for accurate slitting. Unlike traditional devices with a fixed slitting blade position, this device can flexibly adjust the slitting position according to requirements, meeting the diverse slitting specifications in the aviation field. With the cooperation of the pressure assembly, a dual-head motor drives a transmission rod through a transmission wheel and belt, causing the arc-shaped abutment on the slide rod to apply appropriate pressure according to changes in the thickness and material differences of the protective film, ensuring neat slitting edges, greatly improving slitting accuracy, meeting the stringent high-precision requirements of the aviation field for polyurethane protective films, and effectively guaranteeing product quality.

This utility model relates to the field of railway sweeping equipment, specifically disclosing a railway ballast sweeper, including a car body, a drive system, a sweeping system, and a support and guide transmission mechanism. The car body consists of a protective housing and a running gear. The drive system includes a drive motor and an eccentric seat. The sweeping system includes a sweeping platform and sweeping brushes. The support and guide transmission mechanism consists of a support frame, guide wheels, a guide wheel for the sweeper's drive hub motor, a high-pressure support sleeve, and a drive shaft. The drive system and the support and guide transmission mechanism are located inside the protective housing. This utility model features a compact structure, good protection, high sweeping efficiency, a rationally designed platform, convenient inspection and maintenance, stable support, and a highly efficient drive system, significantly improving sweeping efficiency and safety.

This application discloses a charging valve structure for a Stirling refrigerator and a Stirling refrigerator, relating to refrigeration technology. The valve includes: a main valve body with an axially extending mounting cavity, a first interface for connecting to an external air source, and a second interface for connecting to the charging port of the Stirling refrigerator; an adjusting component disposed within the mounting cavity of the main valve body, the adjusting component being rotatable within the mounting cavity and slidable axially along the mounting cavity, one end of the adjusting component having a valve head for controlling the connection / disconnection between the charging port and the first interface; the adjusting component includes a first rotating member and a second rotating member arranged sequentially along the axial direction. The charging valve of this application features small size, ease of operation, easy replacement, and good sealing performance, effectively solving many technical problems caused by existing charging valves and improving process production efficiency.

The utility model discloses a horizontal pressure vessel tank body cleaning device which comprises a horizontal pressure tank, a supporting support, a sealing structure and a cleaning structure, the horizontal pressure tank is installed on the supporting support, the sealing structure is installed on the inner side of the horizontal pressure tank, the cleaning structure is installed on the horizontal pressure tank, and the sealing structure is installed on the inner side of the horizontal pressure tank. The utility model relates to the technical field of horizontal type tank cleaning, the sealing structure is exquisite in design, a horizontal type pressure tank can be reliably sealed, and the safety and the sealing performance in the operation process are ensured; the cleaning structure is innovative and unique, stable stretching and retracting of the horizontal L-shaped telescopic support and the sleeving shaft tube are achieved through transmission of the horizontal driving machine and the gear rack, and the cleaning range is flexibly expanded in cooperation with the repulsion electromagnet and the expansion sliding block.

The application discloses a stripping device for self-adapting different specifications of wire harnesses, comprising a rack, a clamping assembly for clamping the wire harness is arranged on the rack, a driving assembly is arranged on one side of the clamping assembly, a sliding plate and a supporting plate are slidably arranged on the driving assembly, a ball spline is pivotally arranged on the sliding plate, the ball spline is provided with at least a spline shaft and a spline sleeve, the spline sleeve can rotate under the action of a rotating assembly; a cutting frame is fixedly arranged on the spline shaft, a bolt is fixedly arranged on the cutting frame, a transmission arm is pivotally arranged on the bolt, a cutting knife is fixedly arranged on one end of the transmission arm, a connecting arm is pivotally arranged on the other end of the transmission arm, a connecting seat is fixedly arranged on the spline sleeve, and the other end of the connecting arm is pivotally arranged on the connecting seat; a moving assembly for driving the sliding plate to slide and a telescopic assembly for driving the spline shaft to perform telescopic movement are further arranged on the rack. The application has the beneficial effects that the device is compact in structure, reasonable in layout, highly integrated, small in occupied space, applicable to various specifications of wire harnesses, capable of accurately limiting the stripping length of the wire harness, greatly improving the yield and accuracy, and wide in applicability.

The utility model discloses a height difference torque vector distribution device which comprises a differential mechanism, a left half shaft is connected to one end of the differential mechanism, and a right half shaft is connected to the other end of the differential mechanism; a motor is arranged on one side of the left half shaft, a first-stage speed reduction assembly is arranged on the motor, a third-stage speed reduction assembly is arranged on the left half shaft, and the third-stage speed reduction assembly is in transmission connection with the first-stage speed reduction assembly through a second-stage speed reduction assembly; the three-stage speed reduction assembly transmits received power to the planetary gear assembly, and a first gear ring and a second gear ring on the planetary gear assembly transmit the power to a shell and a left half shaft of the differential mechanism respectively. The beneficial effects of the utility model are mainly reflected in that the arrangement has a torque distribution function, and gives consideration to the energy consumption problem and driving experience in yaw dynamics control; and the energy consumption problem and the driving experience in yaw dynamics control are considered.

The application discloses a coarse-grained soil natural and underwater repose angle measuring device based on a tilt positioning technology, which comprises a slope accumulation system, a water storage and drainage system, a pile releasing system and a repose angle measuring system, wherein the water storage and drainage system comprises a water storage tank, the slope accumulation system, the pile releasing system and the repose angle measuring system are fixed in the water storage tank, the pile releasing system is arranged at the tail end of the slope accumulation system, the slope accumulation system is provided with a vertical lifting surface, the pile releasing system is provided with a horizontal baffle, the height of the horizontal baffle is not lower than the height of the vertical lifting surface, the repose angle measuring system is arranged above the slope accumulation system, the repose angle measuring system is provided with a vertical buckle type sliding groove and a protractor, the left side of the vertical buckle type sliding groove is flush with the front end surface of the vertical lifting surface, and the lower end of the protractor is higher than the upper surface of the vertical lifting surface.

The utility model provides a cleaning structure of a high-speed dispersion machine, and relates to the technical field of cleaning structures. A dispersing barrel is fixed to the top end face of the base, a cover plate is buckled to the top of the dispersing barrel, a rotating shaft is rotationally arranged on the cover plate, and impellers are fixed to the rotating shaft in a linear array shape. A first motor is fixed to the top end face of the cover plate. An output shaft of the first motor is fixed to the rotating shaft. A liquid supply pipe of a concave structure is arranged on the cover plate in a sliding mode, and the liquid supply pipe is connected with external cleaning liquid supply equipment. A sponge block is adhered to an annular seat on the liquid supply pipe, and when the liquid supply pipe moves up and down, the sponge block can wipe and clean the inner wall of the dispersion barrel, so that dual cleaning of washing and wiping is realized, and the cleaning quality is further improved. The triangular-section annular protrusions welded to the inner wall of the dispersion barrel can extrude the sponge blocks when the sponge blocks move upwards, sewage in the sponge blocks is squeezed out, the situation that the sponge blocks carry the sewage to cause secondary pollution to the dispersion barrel is avoided, and the continuity and stability of the cleaning effect are guaranteed.

The invention relates to a detection device for battery case production, which comprises a base and an upper cover plate which is arranged above the base and is driven by a driving mechanism to slide, the bottom of the upper cover plate is provided with an extrusion mechanism for extruding a battery case, and the top of the base is provided with a positioning mechanism for positioning the battery case; the invention relates to the technical field of battery shell production. According to the detection device for battery case production, when the detection device is pressed downwards, gas in the main air bag which is firstly pressed can be pressed into all the side air bags around to enable the side air bags to expand, so that secondary wrapping and flexible pressurization sealing of the air bags on the edge of a battery case are realized on the basis of initial positioning of the rigid frame. According to the double-sealing mode of rigid positioning and flexible filling, the workpiece size differential error and surface unevenness are effectively compensated, the sealing uniformity and reliability are ensured, and the leakage false alarm rate is greatly reduced.

The utility model discloses a nut assembling machine, include: body, the inside of body is provided with main drive arrangement, and main drive arrangement includes main motor, and main motor is connected with power supply system through wire, and the output shaft of main motor is connected with nut drive part, and the drive part of nut adaptation is equipped on nut drive part, slide, slide is obliquely arranged on the body, and the output end of slide is equipped with nut positioning part, and nut positioning part is opposite nut drive part, nut supply part, nut supply part sets up in the rear end of slide, and nut supply part supplies nut to the inside of slide, and the rear end of slide is provided with support plate, and nut supply part includes nut deposit bin, and nut deposit bin movably sets up on support plate, and the drive part is set up on nut deposit bin, makes nut can enter the feed port of slide from the nut discharge gate in order, avoids the mutual jam accumulation of nut.

The utility model discloses a mute type electromagnetic valve which comprises a valve seat, a valve body and a shell which are fixedly arranged, a port A is formed in the valve seat, a port B is formed in the valve body, the port B is communicated with the port A, a sealing plug is arranged on the valve body in a sliding mode, a silencing ring is arranged on the sealing plug in a sleeved mode, and a limiting piece used for limiting axial movement of the silencing ring is arranged on the sealing plug. The silencing ring is provided with a silencing end, an outer protruding ring is arranged at the bottom of one side of the silencing end, and the inner wall of the outer protruding ring can be tightly attached to the outer wall of a positioning ring located on the valve body. A damping end is arranged at the top of the other side of the silencing end and can abut against the shell. The utility model has the main beneficial effects that the design is exquisite, the damping end and the outer convex ring can play a role in damping, shock absorption and noise reduction, the situation of hard collision between the valve body and the sealing plug is avoided, the noise is reduced, and meanwhile, the service life is greatly prolonged.