Wheel rolling test device for automobile charging gun

Abstract

The utility model discloses a wheel rolling test device for an automobile charging gun, and belongs to the technical field of durability test of automobile parts. The device comprises a main body provided with a horizontal track and a rolling component provided with rotatable wheels, a counterweight box body is divided into a plurality of containing spaces with grooves, magnetic substrates are laid in the containing spaces, and repellent magnets and protrusions capable of being embedded into the grooves are arranged at the bottom of a counterweight block. Precise positioning and deviation prevention of the counterweight block are achieved through the magnetic attraction effect and mechanical embedding. According to the utility model, the problem of pressure fluctuation caused by unstable balance weight in the test process is effectively solved, and the test device is mainly used for standardized tests of mechanical strength, sealing performance and electrical safety of the new energy automobile charging gun under the working condition of repeated rolling of wheels, and provides a reliable basis for product quality evaluation.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts durability testing technology, and in particular relates to a wheel crush test device for automotive charging guns. Background Technology

[0002] In the field of durability testing for automotive charging guns, wheel crush testing is a crucial step in evaluating the product's mechanical strength and reliability. Existing technologies typically use counterweights to simulate the vertical pressure exerted on the charging gun during vehicle operation. However, long-term testing has revealed a significant deficiency in the stability of the counterweight structure: the counterweight is prone to displacement due to vibration or mechanical impact during operation, resulting in uneven distribution of vertical pressure applied to the tested charging gun. This directly affects the repeatability and accuracy of the test data, making it difficult to meet the stringent controllability requirements of standardized testing.

[0003] Furthermore, to cover the testing needs of different vehicle models, the counterweight assembly needs to have flexible modular adjustment capabilities. However, existing technologies that enhance fixation strength often sacrifice configuration flexibility, making it difficult to meet the universality requirements of multi-condition testing. These conflicting design constraints make the optimization of the counterweight system a key bottleneck in improving the reliability of the testing equipment. Utility Model Content

[0004] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0005] Another objective of this invention is to provide a device for testing the wheel crushing of a car charging gun.

[0006] Therefore, the technical solution provided by this utility model is as follows:

[0007] A wheel crush test device for a car charging gun, comprising:

[0008] The main body is provided with a horizontal rail for the wheels to reciprocate, and the charging gun is placed on the horizontal rail;

[0009] A compaction component includes a compaction frame and a counterweight device. The compaction frame is arranged horizontally, and a rotatable wheel is connected to the lower part of the compaction frame. The counterweight device includes:

[0010] The counterweight box is located above the rolling frame and is divided into multiple receiving spaces. Each receiving space has a groove at the bottom and a magnetic substrate at the bottom. The counterweight box has an opening facing upward and is covered with a cover to close the opening.

[0011] The counterweight blocks are stacked inside the counterweight box. Each counterweight block has a magnet with the opposite polarity to the magnetic substrate at its bottom, and each counterweight block has a protrusion at its bottom that allows it to be embedded in the groove. The magnet surrounds the outside of the protrusion.

[0012] Preferably, in the aforementioned wheel crushing test device for automobile charging guns, the main body is surrounded by a shielding member made of steel plates, one side of which is provided with an openable door. The shielding member is provided with multiple through holes, and the crushing member and the vertical moving member are both located inside the shielding member.

[0013] Preferably, the wheel crush test device for the vehicle charging gun further includes:

[0014] A vertically moving component includes a vertical frame arranged in a vertical direction and a linear guide rail arranged on the side of the vertical frame facing the wheel. The linear guide rail is arranged in a vertical direction. One end of the rolling frame is provided with a guide frame with an opening facing the linear guide rail. Sliding blocks are provided on the inner walls of both sides of the guide frame. The sliding blocks are slidably connected to the linear guide rail.

[0015] Preferably, the wheel crush test device for the vehicle charging gun further includes:

[0016] A geared motor is located on the other side of the vertical frame;

[0017] A half-shaft is horizontally positioned below the rolling frame, the wheel is fitted onto the half-shaft, and one end of the half-shaft is fixedly connected to the output end of the geared motor.

[0018] The auxiliary support structure includes an L-shaped bracket and reinforcing ribs. The horizontal end of the L-shaped bracket is bolted to the lower wall of the rolling frame, while the vertical side is connected to the half shaft through a needle roller bearing. The two ends of the reinforcing ribs are respectively connected to the two sides of the L-shaped bracket to form a triangular structure.

[0019] Preferably, the wheel crush test device for the vehicle charging gun further includes:

[0020] The stator of the linear servo motor is fixedly installed on the side of the vertical frame and is arranged parallel to the linear guide rail. The mover of the linear servo motor is fixedly connected to the guide frame through a connecting plate.

[0021] Preferably, in the aforementioned wheel crushing test device for automotive charging guns, the magnetic substrate includes a magnetic conductive layer and a permanent magnet layer. The surface of the magnetic conductive layer has multiple through holes evenly distributed. The permanent magnet layer is composed of several independent magnetic blocks, each of which is embedded in the through hole with its magnetic poles pointing vertically upward. The top of the magnetic block is flush with the surface of the magnetic conductive layer. The bottom of the magnetic conductive layer is also provided with heat dissipation fins, which extend to the outer sidewall of the counterweight box.

[0022] Preferably, in the wheel crushing test device for the car charging gun, the top and bottom surfaces of the weighted block are provided with staggered anti-slip textures.

[0023] This utility model has at least the following beneficial effects:

[0024] This invention utilizes a design where the magnet at the bottom of the counterweight block and the magnetic substrate have opposite polarities. Combined with the mechanical interlocking of protrusions and grooves, it forms a dual positioning constraint under vibration conditions, effectively suppressing the lateral displacement of the counterweight block and ensuring that the vertical pressure is evenly transmitted to the charging gun under test. At the same time, the magnetic attraction simplifies the disassembly and assembly process of the counterweight block, taking into account both the ease of adjustment and the reliability of fixation.

[0025] This utility model isolates the testing process from external airflow disturbances and foreign object intrusion by setting up a steel plate shielding component. At the same time, it can prevent the charging gun from sliding out of the testing area during the crushing process. The through hole design takes into account the heat dissipation requirements, and the openable door allows the operator to quickly adjust the testing configuration, thereby improving the stability of the testing environment and the efficiency of operation.

[0026] This invention constrains the vertical movement freedom of the rolling frame by sliding the linear guide rail and the guide frame, avoiding the deviation of the pressure loading angle caused by lateral offset during wheel rolling, ensuring that the wheel always moves along the preset vertical trajectory, and improving the reproduction of the test conditions.

[0027] This invention utilizes a direct drive connection between a geared motor and a half-shaft, along with a triangular support structure consisting of an L-shaped bracket and reinforcing ribs. This reduces energy loss during power transmission, enhances the bending stiffness of the wheel's rotating shaft, minimizes the risk of plastic deformation of the support structure under long-term impact loads, and extends the device's service life.

[0028] This invention uses a linear servo motor to drive the guide frame to move along a linear guide rail, thereby achieving closed-loop control of the vertical height of the compaction component. It can precisely adjust the compaction pressure of the wheel on the charging gun, avoiding pressure fluctuations caused by the compressibility of the medium in traditional hydraulic or pneumatic drives, and improving the controllability of test parameters.

[0029] This invention combines a magnetic conductive layer with independent magnetic blocks, using through holes to separate magnetic pole areas, reducing magnetic interference between adjacent magnetic blocks. Heat dissipation fins conduct heat from the magnetic substrate to the outside of the box, preventing magnetic attenuation caused by temperature rise, thereby maintaining the long-term stability of the adsorption force of the combined blocks.

[0030] This invention increases the frictional resistance of the contact surface during stacking by designing an interlaced anti-slip texture on the surface of the counterweight blocks, preventing the upper counterweight blocks from sliding tangentially during vibration. At the same time, the interlaced texture layout avoids the overall center of gravity shift caused by excessive stacking gaps, further improving the structural stability of the counterweight system.

[0031] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the wheel crush test device for a car charging gun in one of the embodiments of this utility model.

[0033] Figure 2 This is a schematic diagram of the counterweight box in one of the embodiments of this utility model.

[0034] Figure 3 This is a schematic diagram of the structure of the reassembly block in one of the embodiments of this utility model.

[0035] Figure 4 This is a schematic diagram of the structure of the wheel crush test device for a car charging gun in one of the embodiments of this utility model. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a wheel crush test device for automobile charging guns, comprising:

[0038] The main body is provided with a horizontal rail 1 for the wheels to move back and forth, and the charging gun is placed on the horizontal rail 1;

[0039] A compaction component includes a compaction frame 4 and a counterweight device 5. The compaction frame 4 is arranged horizontally, and a rotatable wheel is connected to the lower part of the compaction frame 4. The counterweight device 5 includes:

[0040] The counterweight box is located above the rolling frame 4 and is divided into multiple accommodating spaces. Each accommodating space has a groove 401 at the bottom and a magnetic substrate at the bottom. The counterweight box has an opening facing upward and is covered with a cover to close the opening.

[0041] The counterweight blocks 410 are stacked inside the counterweight box. Each counterweight block 410 has a magnet 420 with the opposite polarity to the magnetic substrate at its bottom, and each counterweight block 410 has a protrusion 402 at its bottom. The protrusion 402 allows it to be embedded in the groove 401, and the magnet 420 surrounds the outside of the protrusion 402.

[0042] The length of the horizontal track 1 can be set to 3-5 meters and the width to 0.8-1.2 meters to meet the testing requirements of charging guns of different sizes. The track surface can be made of anodized aluminum alloy or galvanized steel plate. The main frame can be a welded rectangular steel pipe structure, fixed to a concrete base with anchor bolts.

[0043] The charging gun placement area is located in the middle of the track. Adjustable clamps (such as V-shaped clamps or nylon straps) can be set to fix the gun body. Shock-absorbing rubber pads can be laid under the track to absorb the impact energy of the wheels.

[0044] The operator places the charging gun in the center of the designated area on the track, starts the test program, and the wheel reciprocates along the length of the track.

[0045] The compaction frame 4 can be made of welded steel beams, with a horizontal extension length matching the track. Solid tires can be used for the wheels. The wheels are connected to the compaction frame 4 via half-axles.

[0046] The counterweight box can be divided into 4-6 independent compartments, with partitions 3-5 mm thick. Grooves 401 are arranged in a matrix at the bottom of the compartments.

[0047] During the wheel rolling process, the counterweight box moves synchronously with the rolling frame 4, and the magnetic attraction and mechanical engagement work together to resist the displacement caused by vibration.

[0048] The reassembly block 410 can be designed as a cubic structure, and the magnet 420 can be a neodymium iron boron disc, which is installed on the periphery of the protrusion 402 with a distance of 5-10 mm from the center of the protrusion 402.

[0049] During assembly, the protrusion 402 of the assembly block 410 is aligned with the groove 401 at the bottom of the receiving space and pressed down, and the magnet 420 generates an adsorption force after contacting the magnetic substrate.

[0050] When installing the 410 reassembly block, it automatically aligns itself using its own weight and magnetic attraction. When disassembling, a vertical pulling force must be applied to overcome the magnetic attraction.

[0051] This solution ensures the repeatability of the test environment; the segmented counterweight box and dual positioning structure design achieve precise positioning of the counterweight under dynamic load; the modular counterweight block 410, combined with a standardized interface, balances the flexibility of test load configuration with operational efficiency.

[0052] In one embodiment of this utility model, as a preferred embodiment, such as Figure 4 As shown, the main body is surrounded by a shielding member 6 made of steel plates, one side of which is provided with an openable door. The shielding member 6 is provided with multiple through holes, and the crushing member and the vertical moving member are both located inside the shielding member 6.

[0053] The steel plate thickness of shielding component 6 can be selected from cold-rolled steel plate, and the surface can be sprayed with epoxy anti-rust paint. The installation height of the surrounding panels can be set to 1.5-1.8 meters, and a galvanized steel plate cover can be added to the top. The door frame can be made of welded angle steel, and the inside of the door leaf can be filled with polyurethane sound insulation cotton.

[0054] The door hinges can be heavy-duty stainless steel hinges. The bottom of the shielding component 6 is fixed to the ground. The joints of the enclosure panels can be continuously welded using argon arc welding.

[0055] Before the test begins, open the door and place the charging gun. After closing the door, insert the door lock pin into the positioning hole to form a sealed test space.

[0056] Through holes can be evenly distributed in a matrix.

[0057] During the test, the heat generated by the motor is dissipated through natural convection via the through holes, while external airflow disturbances are blocked by the steel plate.

[0058] The wheel centerline of the compaction component can maintain a clearance from the side wall of the shielding component to avoid motion interference. The top of the linear guide rail of the vertically moving component can have a pre-existing space from the lower surface of the top cover plate to facilitate guide rail maintenance.

[0059] The inner wall of the shielding component 6 can be lined with rubber sound-absorbing cotton, which is bonded to the steel plate with neoprene adhesive. Internal wiring can be arranged in the cable tray below the top cover plate, which is removable for easy maintenance.

[0060] During testing, operators monitor the internal operating status through the observation window, while the through-hole maintains the balance of internal and external air pressure.

[0061] This solution effectively isolates external environmental interference through a steel plate enclosure structure, preventing the charging gun from sliding out of the test area during the crushing process. The through-hole layout balances heat dissipation and protection requirements; the openable door design facilitates test preparation and equipment maintenance; and the internal space planning ensures that the movement of each component is uninterrupted, providing stable environmental conditions for the testing process.

[0062] In one preferred embodiment of this utility model, it further includes:

[0063] The vertical moving component includes a vertical frame 3 arranged in a vertical direction and a linear guide rail arranged on the side of the vertical frame 3 facing the wheel. The linear guide rail is arranged in a vertical direction. One end of the rolling frame 4 is provided with a guide frame with an opening facing the linear guide rail. Sliding blocks are provided on the inner walls of both sides of the guide frame. The sliding blocks are slidably connected to the linear guide rail.

[0064] The height of the vertical frame 3 can be set to 2-3 meters, and it is welded from carbon steel rectangular tubing. The linear guide rails can be ball-bearing or roller-type, with the length of a single rail matching the height of the vertical frame 3, and the rail width can be selected as 45-60 mm. The bottom of the vertical frame 3 can be bolted to the main frame via a flange.

[0065] The vertical frame 3 stands vertically behind the test area, and the linear guide rail provides a precise vertical motion guide reference.

[0066] The guide frame can be designed as a U-shaped groove structure, and the sliding block can be a four-row ball recirculating slider.

[0067] A reinforcing plate can be welded to the connection end between the guide frame and the compaction frame 4. When the compaction frame 4 is raised or lowered, the guide frame slides along the linear guide rail.

[0068] This solution ensures the straightness of the rolling frame 4 in the vertical direction by using a high-precision linear guide rail and a rigid guide frame; during the movement of the wheels, the vertical movement of the rolling frame 4 can simulate the bumpy state of a car.

[0069] In one preferred embodiment of this utility model, it further includes:

[0070] A geared motor is located on the other side of the vertical frame 3;

[0071] A half-shaft is horizontally positioned below the rolling frame 4, the wheel is fitted onto the half-shaft, and one end of the half-shaft is fixedly connected to the output end of the geared motor.

[0072] The auxiliary support structure includes an L-shaped bracket and reinforcing ribs. The horizontal end of the L-shaped bracket is bolted to the lower wall of the rolling frame 4, while the vertical side is connected to the half shaft through a needle roller bearing. The two ends of the reinforcing ribs are respectively connected to the two sides of the L-shaped bracket to form a triangular structure.

[0073] The geared motor transmits torque to the half-shaft, and the speed is adjusted by the frequency converter to adapt to different rolling speed requirements.

[0074] When the tire rotates with the half-shaft, the hub keyway forms a rigid connection with the half-shaft, and the retaining ring prevents the hub from moving axially.

[0075] The horizontal side of the L-shaped bracket can be made of hot-rolled steel plate, and the weld between the reinforcing rib and the L-shaped bracket can be a continuous fillet weld.

[0076] When the wheel rotates, the L-shaped bracket shares the radial load through the needle roller bearing, and the reinforcing ribs suppress the torsional deformation of the bracket.

[0077] This solution ensures stable speed output through a rigidly connected power transmission system, and the precise fit between the half-shaft and the hub reduces power loss; the triangular structure of the auxiliary support components enhances local rigidity and disperses the impact of alternating loads on the connection points; the modular design facilitates the rapid replacement and maintenance of key components.

[0078] In one preferred embodiment of this utility model, it further includes:

[0079] The stator of the linear servo motor is fixedly installed on the side of the vertical frame 3 and is arranged parallel to the linear guide rail. The mover of the linear servo motor is fixedly connected to the guide frame through a connecting plate.

[0080] When the servo motor is powered on, the stator generates an electromagnetic field that drives the mover to move along the guide rail.

[0081] Aluminum alloy plates can be used for the connecting plates.

[0082] The contact surface between the guide frame and the connecting plate can be covered with a polytetrafluoroethylene wear-resistant pad.

[0083] This solution uses a high-precision linear servo motor to achieve closed-loop control of the displacement of the rolling component, and the parallel calibration of the guide rail ensures that the motion trajectory is without deviation; the rigid connection structure effectively transmits the driving force and suppresses vibration.

[0084] In one preferred embodiment of this invention, the magnetic substrate comprises a magnetically conductive layer and a permanent magnet layer. Multiple through-holes are uniformly formed on the surface of the magnetically conductive layer. The permanent magnet layer is composed of several independent magnetic blocks, each embedded within a through-hole with its magnetic poles pointing vertically upwards. The top of each magnetic block is flush with the surface of the magnetically conductive layer. Heat dissipation fins are also provided at the bottom of the magnetically conductive layer, extending to the outer sidewall of the counterweight box. This design optimizes the magnetic circuit distribution through the embedded combination of the magnetically conductive layer and the permanent magnet layer, reducing magnetic field interference between adjacent magnetic blocks. The modular magnetic block assembly method facilitates rapid replacement in case of localized damage, reducing maintenance costs.

[0085] In one embodiment of this utility model, preferably, the top and bottom surfaces of the reassembly block 410 are provided with staggered anti-slip textures.

[0086] In one embodiment of this utility model, it further includes:

[0087] A controller, connected to the linear servo motor, controls the linear movement of the mover along the stator, thereby driving the rolling frame 4 to perform precise lifting and lowering movements along the linear guide rail via the guide frame. The controller is also connected to a geared motor.

[0088] To enable those skilled in the art to better understand the technical solution of this utility model, the following embodiments are provided for further explanation:

[0089] This invention provides a device for testing the wheel crushing effect on a car charging gun.

[0090] The main body is provided with a horizontal track 1 for the reciprocating movement of the wheels, and the charging gun is placed on the horizontal track 1; the main body is surrounded by a shielding member 6 made of steel plates, one side of which is provided with an openable door, and the shielding member 6 is provided with multiple through holes, and the crushing member and the vertical moving member are both located inside the shielding member 6.

[0091] A compaction component includes a compaction frame 4 and a counterweight device 5. The compaction frame 4 is arranged horizontally, and a rotatable wheel is connected to the lower part of the compaction frame 4. The counterweight device 5 includes:

[0092] The counterweight box is positioned above the rolling frame 4 and is divided into multiple accommodating spaces. Each accommodating space has a groove 401 at its bottom and a magnetic substrate at its bottom. The counterweight box has an upward-facing opening and is covered by a lid. The magnetic substrate includes a magnetic conductive layer and a permanent magnet layer. Multiple through holes are evenly distributed on the surface of the magnetic conductive layer. The permanent magnet layer is composed of several independent magnetic blocks, each of which is embedded in the through hole with its magnetic poles pointing vertically upward. The top of the magnetic block is flush with the surface of the magnetic conductive layer. The bottom of the magnetic conductive layer is also provided with heat dissipation fins that extend to the outer sidewall of the counterweight box.

[0093] The counterweight blocks 410 are stacked inside the counterweight box. Each counterweight block 410 has a magnet 420 with the opposite polarity to the magnetic substrate at its bottom, and each counterweight block 410 also has a protrusion 402 at its bottom, which allows it to be embedded in the groove 401. The magnet 420 surrounds the outside of the protrusion 402. The top and bottom surfaces of the counterweight blocks 410 are provided with staggered anti-slip textures.

[0094] The vertical moving component includes a vertical frame 3 arranged in a vertical direction and a linear guide rail arranged on the side of the vertical frame 3 facing the wheel. The linear guide rail is arranged in a vertical direction. One end of the rolling frame 4 is provided with a guide frame with an opening facing the linear guide rail. Sliding blocks are provided on the inner walls of both sides of the guide frame. The sliding blocks are slidably connected to the linear guide rail.

[0095] A geared motor is located on the other side of the vertical frame 3;

[0096] A half-shaft is horizontally positioned below the rolling frame 4, the wheel is fitted onto the half-shaft, and one end of the half-shaft is fixedly connected to the output end of the geared motor.

[0097] The auxiliary support structure includes an L-shaped bracket and reinforcing ribs. The horizontal end of the L-shaped bracket is bolted to the lower wall of the rolling frame 4, while the vertical side is connected to the half shaft through a needle roller bearing. The two ends of the reinforcing ribs are respectively connected to the two sides of the L-shaped bracket to form a triangular structure.

[0098] The stator of the linear servo motor is fixedly installed on the side of the vertical frame 3 and is arranged parallel to the linear guide rail. The mover of the linear servo motor is fixedly connected to the guide frame through a connecting plate.

[0099] Although embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A device for testing the wheel crushing force of an automobile charging gun, characterized in that, include: The main body is provided with a horizontal rail for the wheels to reciprocate, and the charging gun is placed on the horizontal rail; A compaction component includes a compaction frame and a counterweight device. The compaction frame is arranged horizontally, and a rotatable wheel is connected to the lower part of the compaction frame. The counterweight device includes: The counterweight box is positioned above the rolling frame and is divided into multiple receiving spaces. Each receiving space has a groove at its bottom and a magnetic substrate is laid at its bottom. The counterweight blocks are stacked inside the counterweight box. Each counterweight block has a magnet with the opposite polarity to the magnetic substrate at its bottom, and each counterweight block has a protrusion at its bottom that allows it to be embedded in the groove. The magnet surrounds the outside of the protrusion.

2. The wheel crushing test device for automobile charging guns as described in claim 1, characterized in that, The main body is surrounded by a shielding component made of steel plates, and one side is provided with an openable door. The shielding component is provided with multiple through holes, and the crushing component and the vertical moving component are both located inside the shielding component.

3. The wheel crushing test device for automobile charging guns as described in claim 1, characterized in that, Also includes: A vertically moving component includes a vertical frame arranged in a vertical direction and a linear guide rail arranged on the side of the vertical frame facing the wheel. The linear guide rail is arranged in a vertical direction. One end of the rolling frame is provided with a guide frame with an opening facing the linear guide rail. Sliding blocks are provided on the inner walls of both sides of the guide frame. The sliding blocks are slidably connected to the linear guide rail.

4. The wheel crushing test device for automobile charging guns as described in claim 3, characterized in that, Also includes: A geared motor is located on the other side of the vertical frame; A half-shaft is horizontally positioned below the rolling frame, the wheel is fitted onto the half-shaft, and one end of the half-shaft is fixedly connected to the output end of the geared motor. The auxiliary support structure includes an L-shaped bracket and reinforcing ribs. The horizontal end of the L-shaped bracket is bolted to the lower wall of the rolling frame, while the vertical side is connected to the half shaft through a needle roller bearing. The two ends of the reinforcing ribs are respectively connected to the two sides of the L-shaped bracket to form a triangular structure.

5. The wheel crushing test device for automobile charging guns as described in claim 3, characterized in that, Also includes: The stator of the linear servo motor is fixedly installed on the side of the vertical frame and is arranged parallel to the linear guide rail. The mover of the linear servo motor is fixedly connected to the guide frame through a connecting plate.

6. The wheel crushing test device for an automobile charging gun as described in claim 1, characterized in that, The magnetic substrate includes a magnetic conductive layer and a permanent magnet layer. Multiple through holes are uniformly formed on the surface of the magnetic conductive layer. The permanent magnet layer is composed of several independent magnetic blocks. Each magnetic block is embedded in the through hole and its magnetic pole direction is vertically upward. The top of the magnetic block is flush with the surface of the magnetic conductive layer. Heat dissipation fins are also provided at the bottom of the magnetic conductive layer and extend to the outer sidewall of the counterweight box.

7. The wheel crushing test device for automobile charging guns as described in claim 1, characterized in that, The top and bottom surfaces of the reassembly block are provided with staggered anti-slip textures.

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