A kind of yoke foot package plastic block reciprocating abrasion test device

Abstract

The present application provides a kind of fork fork package plastic block reciprocating wear test device.It relates to accessory testing equipment technical field.The fork fork package plastic block reciprocating wear test device includes test rack, one side of the test rack is slidably installed with bearing box, the lower portion of the bearing box is equipped with connecting base plate, the bottom of the connecting base plate is fixedly installed with multiple clamping mechanisms, to fix package plastic block, multiple pressure applying mechanisms are equipped in the bearing box, to downwardly apply pressure to package plastic block, and multiple pressure applying mechanisms are connected with the connecting base plate;Pushing mechanism is equipped in the bearing box, to drive pressure applying mechanism to descend, realize the purpose of applying pressure, pressure sensor is equipped in the bearing box, and the pressure sensor is matched with the pushing mechanism.The present application has the advantages of being able to simultaneously test multiple package plastic blocks, guaranteeing uniform standard of applying pressure, and being able to adapt to multiple friction coefficient test scenarios.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of accessory testing equipment, in particular to a fork foot plastic block reciprocating wear testing device. BACKGROUND

[0002] In the field of automobile gearboxes, mechanical transmissions, etc., the fork is a key component for realizing gear shifting and other operations. For example, in an automobile gearbox, the driver operates the gear lever, which drives the fork to move through a series of mechanical structures, and the fork foot pushes the synchronizer or gear to realize the switching of different gears, ensuring that the automobile can maintain appropriate power output under various driving conditions. In order to reduce the friction and wear between the fork and the driven component, reduce the impact force and noise during gear shifting, and improve the smoothness and reliability of gear shifting, a plastic block is installed at the fork foot of the fork. The fork foot plastic block is usually made of plastic material that is resistant to wear and impact, and is installed at the contact position of the fork foot and the driven component (such as the synchronizer sleeve, gear, etc.). Therefore, the wear resistance of the fork foot plastic block directly affects the stability and reliability of the entire transmission system.

[0003] At present, in order to verify the performance of the fork foot plastic block, a reciprocating friction method is often used for testing. During the testing process, the friction surface of the plastic block is in contact with the friction platform, and then a certain pressure is applied and repeatedly moved. The wear data is obtained through performance detection after a certain number of reciprocations. However, this testing method has many problems:

[0004] Firstly, this method can only test a single plastic block at a time. After completing the test of one sample, the old sample needs to be disassembled, the new sample needs to be clamped and fixed again, and the pressure parameters need to be adjusted again before the next test can be carried out. For the same size and batch of samples, it is difficult to ensure that the contact pressure is exactly the same during the repeated clamping and pressure adjustment process. The pressure fluctuation directly leads to large dispersion of test data and difficult error control.

[0005] Secondly, during the testing process, the plastic block can only be tested on a single friction coefficient friction platform, and cannot simulate the scenario of the plastic block contacting with different friction coefficient driven components in actual working conditions. Only the wear data under a single working condition can be obtained. However, the test results under a single working condition cannot fully reflect the performance of the plastic block under complex actual working conditions, resulting in serious lack of universality of the test results.

[0006] Therefore, it is necessary to provide a new fork foot plastic block reciprocating wear testing device to solve the above technical problems. SUMMARY

[0007] The present application aims to provide a forked foot plastic block reciprocating wear testing device which can simultaneously test multiple plastic blocks, ensure uniform pressure application standards, and adapt to various friction coefficient testing scenarios.

[0008] To solve the above technical problems, the forked foot plastic block reciprocating wear testing device provided by the present application comprises a test rack, a bearing box is slidably installed on one side of the test rack, a connecting base plate is arranged below the bearing box, a plurality of clamping mechanisms are fixedly installed at the bottom of the connecting base plate to fix the plastic blocks, a plurality of pressure application mechanisms are arranged in the bearing box to apply downward pressure to the plastic blocks, and the pressure application mechanisms are connected to the connecting base plate; a pushing mechanism is arranged in the bearing box to drive the pressure application mechanisms to descend and achieve the purpose of pressure application; a pressure sensor is arranged in the bearing box and matched with the pushing mechanism; a plurality of conversion shafts are rotatably installed on the test rack, four test platforms arranged in a ring array are fixedly installed on each conversion shaft, the friction coefficients of the four test platforms on any conversion shaft are different, and a reciprocating movement mechanism is arranged at the top of the test rack to drive the clamping mechanisms to reciprocate for wear testing.

[0009] Further, any clamping mechanism in the plurality of clamping mechanisms comprises a U-shaped support, the U-shaped support is fixedly connected to the connecting base plate through two support rods, clamping cylinders are fixedly installed on the outer walls on both sides of the U-shaped support, the output shafts of the two clamping cylinders extend into the U-shaped support and are slidably connected to the U-shaped support, side clamping pieces are fixedly installed on the output shafts of the two clamping cylinders, an adjusting screw is threadedly installed at the top of the U-shaped support, the bottom end of the adjusting screw extends into the U-shaped support and is rotatably installed with a downward pressing piece, a limiting rod is fixedly installed at the top of the downward pressing piece, the top end of the limiting rod extends above the U-shaped support and is slidably connected to the top of the U-shaped support, and a first jackscrew is threadedly installed on one side of the U-shaped support.

[0010] Further, any pressure application mechanism in the plurality of pressure application mechanisms comprises a guide block, the guide block is arranged in the bearing box, a lifting slide column is fixedly installed at the bottom of the guide block, the bottom end of the lifting slide column extends below the bearing box and is slidably connected to the bottom of the bearing box, the bottom end of the lifting slide column is fixedly connected to the connecting base plate, a compression spring is sleeved on the lifting slide column, the top end of the compression spring is fixedly connected to the guide block, the bottom end is fixedly connected to the inner wall at the bottom of the bearing box, and a triangular top groove is formed in one side of the guide block.

[0011] Further, the pushing mechanism comprises a transverse pressure adjusting rod fixedly installed on the inner wall of one side of the bearing box, a sliding seat is slidably installed on the transverse pressure adjusting rod, a second jacking screw is threadedly installed on one side of the sliding seat, the end of the second jacking screw abuts against the transverse pressure adjusting rod, a mounting plate is fixedly installed on the top inner wall of the bearing box, a pressure adjusting screw is threadedly installed on the mounting plate, one end of the pressure adjusting screw is rotatably connected with the sliding seat, a connecting plate is fixedly installed on the bottom of the sliding seat, a plurality of wedge-shaped top plates are fixedly installed on the bottom of the connecting plate, one side of each of the plurality of wedge-shaped top plates extends into a corresponding triangular top groove, and the wedge-shaped top plate is matched with the triangular top groove.

[0012] Further, a reinforcing plate is fixedly installed on the inner wall of one side of the bearing box away from the transverse pressure adjusting rod, one end of the transverse pressure adjusting rod is fixedly connected with the reinforcing plate, an adjusting folding rod is fixedly installed on the top inner wall of the bearing box and the top of the reinforcing plate, one same mounting strip is slidably installed on the two adjusting folding rods, a connecting rod is fixedly installed on the side of the mounting strip close to the sliding seat, one end of the connecting rod close to the sliding seat is fixedly connected with the pressure sensor, two third jacking screws are threadedly installed on the mounting strip, and the ends of the two third jacking screws abut against the two adjusting folding rods, respectively.

[0013] Further, the reciprocating movement mechanism comprises a first rotary motor fixedly installed on the top of the test bench, a turntable is fixedly installed on the output shaft of the first rotary motor, an eccentric shaft is fixedly installed on the turntable, a linkage seat is fixedly installed on the top of the bearing box, a long waist hole is formed in the linkage seat, and the eccentric shaft penetrates through the long waist hole and is matched with the inner wall of the long waist hole.

[0014] Further, two guide rails are fixedly installed on the side of the test bench close to the bearing box, two sliding blocks are slidably installed on each of the two guide rails, one side of each of the four sliding blocks is fixedly connected with the bearing box, a digital display screen is arranged on the top of the bearing box, and the digital display screen is used in cooperation with the pressure sensor.

[0015] Further, the conversion shaft is installed on the test bench through a damping rotating shaft, a plurality of conversion discs are fixedly sleeved on the conversion shaft, four directional counterbores in annular array distribution are formed on the outer wall of the plurality of conversion discs, an installation sheet is fixedly installed on the side of the test bench away from the bearing box, a telescopic cylinder is fixedly installed on the top of the installation sheet, the output shaft of the telescopic cylinder penetrates through the installation sheet and is in sliding connection with the installation sheet, a fixed connection plate is fixedly installed on the output shaft of the telescopic cylinder, a plurality of hollow columns are fixedly installed on the bottom of the fixed connection plate, the bottom of the hollow column is open, a plurality of lifting plates are slidingly installed on the plurality of hollow columns, directional columns are arranged in the plurality of hollow columns, the top end of the directional column is fixedly connected with the corresponding lifting plate, the bottom end of the directional column extends below the corresponding hollow column and is inserted into the corresponding directional counterbore, a top spring is fixedly installed on the top inner wall of the plurality of hollow columns, the bottom end of the top spring is fixedly connected with the corresponding lifting plate, four prompt arc grooves in annular array distribution are formed on the side of the plurality of conversion discs close to the test bench, a plurality of prompt pressing rods are slidingly installed on the test bench, a baffle is fixedly installed on the side of the prompt pressing rod away from the conversion disc, a reset spring is sleeved on the prompt pressing rod, one end of the reset spring is fixedly connected with the corresponding baffle, the other end is fixedly connected with the test bench, the end of the prompt pressing rod inserted into the prompt arc groove is in spherical shape.

[0016] Furthermore, a cleaning box is provided below the conversion shaft. The top of the cleaning box has multiple insertion slots adapted to the size of the test platform. Rectangular sleeves are fixedly fitted onto each of the multiple test platforms, and sealing rings are fixedly installed at the bottom of each rectangular sleeve. Two lifting slide rails are fixedly installed on the test frame, and two sliding plates are slidably installed on the two lifting slide rails. One side of each sliding plate is fixedly connected to the cleaning box. A hydraulic cylinder is fixedly installed on the test frame between the two lifting slide rails, and the output shaft of the hydraulic cylinder is fixedly connected to the lower sliding plate. A liquid nitrogen spraying assembly is provided on the test frame. Two side connectors are fixedly installed on the test bench. The cleaning box is located between the two side connectors. A horizontal main pipe is fixedly installed on the side of the two side connectors that are close to each other. The liquid nitrogen spraying assembly is connected to the horizontal main pipe through a delivery pipe. An external housing is fixedly installed on the side of the cleaning box away from the test bench. The bottom of the external housing is designed to be inclined. Multiple first connecting bends are fixedly installed on the side of the external housing away from the cleaning box. One end of each of the multiple first connecting bends is fixedly installed with one end of a compensating hose. The other end of each of the multiple compensating hoses is fixedly connected to the horizontal main pipe. The other ends of the multiple first connecting bends are located inside the external housing. One end of a telescopic tube is fixedly installed, and the other end of each of the multiple telescopic tubes is fixedly installed with one end of a second connecting folding tube. The other end of each of the multiple second connecting folding tubes is fixedly installed with a flared opening, which is located below each of the multiple insertion ports. Multiple first connecting rods are slidably installed on the side of the external housing away from the cleaning box. One end of each first connecting rod is inside the external housing, and the other end is outside the external housing. The ends of the multiple first connecting rods inside the external housing are fixedly connected to corresponding second connecting folding tubes. A first rodless cylinder is fixedly installed on the top of the external housing. A linkage folding bar is fixedly installed on the slider of the first rodless cylinder. The bottom of the movable folding bar is fixedly connected to multiple first connecting rods. A second rodless cylinder is fixedly installed on one side of the outer wall of the cleaning box. Two second connecting rods are fixedly installed on the slider of the second rodless cylinder. Both second connecting rods pass through the cleaning box and are slidably connected to it. Multiple concave brackets are fixedly installed on the two second connecting rods. The concave brackets are located inside the cleaning box. Brush rollers are rotatably installed in each of the multiple concave brackets. The multiple brush rollers are staggered with multiple insertion ports. A second rotary motor is fixedly installed on one side of the outer wall of each of the multiple concave brackets. The output shafts of the multiple second rotary motors are fixedly connected to one end of the multiple brush rollers respectively.

[0017] Furthermore, the bottom of the cleaning box is provided with a discharge port, and the bottom of the discharge port is fastened with a flip cover. The liquid nitrogen spraying assembly includes a liquid nitrogen tank and a liquid nitrogen pump. The outlet of the liquid nitrogen pump is fixedly connected to the delivery pipe. Valves are provided on multiple first connecting pipes. An exhaust pipe is fixedly installed on one side of the cleaning box.

[0018] Compared with related technologies, the reciprocating wear testing device for the plastic block covering the fork foot provided by the present invention has the following advantages:

[0019] I. This invention uses multiple U-shaped brackets to simultaneously clamp multiple plastic-coated blocks, along with a unified pressure application mechanism and a pushing mechanism, to avoid the limitation of testing only a single sample at a time, reduce the number of repeated clamping and adjustments, ensure pressure consistency in batch testing, and reduce data dispersion.

[0020] Second, this invention uses a conversion shaft to switch between test platforms with different friction coefficients, which can simulate complex actual working conditions. At the same time, it supports rapid switching between one or more test platforms, improves the diversity of test scenarios, and solves the problem of insufficient universality of single working condition testing.

[0021] Third, this invention achieves precise control of test platform positioning and pressure adjustment through a prompting lever, pressure sensor and digital display screen, and a single test platform can be switched independently, further improving test efficiency and ease of operation. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of the first embodiment of the reciprocating wear testing device for the plastic-coated block of the fork foot provided by the present invention;

[0023] Figure 2 A schematic diagram of the back side structure of the first embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention;

[0024] Figure 3 A cross-sectional view of the connection structure of the conversion shaft and the conversion disk in the first embodiment of the reciprocating wear test device for the plastic-coated block of the shift fork foot provided by the present invention;

[0025] Figure 4 A schematic diagram of the assembly structure of the connecting base plate, guide block and U-shaped bracket in the first embodiment of the reciprocating wear test device for the fork foot plastic block provided by the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the bearing box in the first embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention.

[0027] Figure 6 A schematic diagram of the connection structure between the connecting base plate and the lifting slide column in the first embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention;

[0028] Figure 7 A schematic diagram of the U-shaped bracket in the first embodiment of the reciprocating wear test device for the fork foot plastic block provided by the present invention;

[0029] Figure 8 A schematic diagram of the directional countersunk hole and the indicator arc groove in the first embodiment of the reciprocating wear test device for the fork foot plastic block provided by the present invention;

[0030] Figure 9 A schematic diagram of the connection structure between the fixed plate and the hollow column in the first embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention;

[0031] Figure 10 A cross-sectional view of the hollow column in the first embodiment of the reciprocating wear test device for the fork foot plastic block provided by the present invention;

[0032] Figure 11 This is a front view schematic diagram of a second embodiment of the reciprocating wear testing device for the plastic-coated block of the fork foot provided by the present invention;

[0033] Figure 12 A schematic diagram of the connection structure between the liquid nitrogen spraying component and the delivery pipe in the second embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention;

[0034] Figure 13 A schematic diagram of the installation structure of the horizontal main tube in the second embodiment of the reciprocating wear test device for the fork foot plastic block provided by the present invention;

[0035] Figure 14 A schematic diagram of the connection structure between the rectangular sleeve and the sealing ring in the second embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention;

[0036] Figure 15 This is a schematic diagram of the assembly structure of the cleaning box and the external box in the second embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention.

[0037] Figure 16 A schematic diagram of the connection structure between the hydraulic cylinder and the sliding plate in the second embodiment of the reciprocating wear test device for the plastic-coated block of the shift fork foot provided by the present invention;

[0038] Figure 17 This is a schematic cross-sectional view of the connection structure between the cleaning box and the external box in the second embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention.

[0039] Figure 18 This is a schematic diagram of the external structure of the cleaning box in the second embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention.

[0040] Figure 19A schematic diagram of the internal structure of the external housing in the second embodiment of the reciprocating wear test device for the plastic-coated block of the fork foot provided by the present invention;

[0041] Figure 20 This is a schematic diagram of the installation structure of the brush roller in the second embodiment of the reciprocating wear test device for the fork foot plastic block provided by the present invention.

[0042] Labels in the diagram: 1. Test bench; 2. Carrier box; 3. Connecting base plate; 4. U-shaped bracket; 401. Clamping cylinder; 402. Side clamp; 403. Adjusting screw; 404. Lower pressure plate; 5. Guide block; 501. Lifting slide column; 502. Compression spring; 503. Triangular top groove; 6. Horizontal pressure adjusting rod; 601. Mounting plate; 602. Slide seat; 603. Pressure adjusting screw; 604. Connecting plate; 605. Wedge-shaped top plate; 7. Reinforcing plate; 8. Adjusting lever; 9. Mounting strip; 10. Connecting rod; 11. Pressure sensor; 12. First rotary motor; 1201. Turntable; 1202. Eccentric shaft; 1203. Linkage seat; 1204. Long slotted hole; 13. Conversion shaft; 14. Test platform ; 15. Converter disc; 16. Directional countersunk hole; 17. Mounting plate; 18. Telescopic cylinder; 19. Fixing plate; 20. Hollow column; 21. Lifting plate; 22. Directional column; 23. Top spring; 24. Cleaning box; 25. Interceptor; 26. Rectangular sleeve; 27. Sealing ring; 28. Hydraulic cylinder; 29. ​​Sliding plate; 30. Liquid nitrogen spray assembly; 31. Horizontal main pipe; 32. Conveying pipe; 33. External housing; 34. First connecting fold; 35. Compensating hose; 36. Telescopic pipe; 37. Second connecting fold; 38. First rodless cylinder; 39. Linkage fold; 40. First connecting rod; 41. Second rodless cylinder; 4101. Second connecting rod; 4102. Concave bracket; 4103. Brush roller. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] First embodiment:

[0045] Please refer to the following: Figures 1-10The device for testing the reciprocating wear of the plastic-coated blocks of shift forks includes: a test bench 1 and a carrier box 2. Two guide rails are fixedly installed on the side of the test bench 1 near the carrier box 2, and two sliders are slidably installed on each guide rail, forming four sliders. One side of each of the four sliders is fixedly connected to the carrier box 2, allowing the carrier box 2 to slide linearly on the test bench 1. A connecting base plate 3 is located below the carrier box 2, and multiple clamping mechanisms are fixedly installed at the bottom of the connecting base plate 3 to fix the plastic-coated blocks. Multiple pressure applying mechanisms are located inside the carrier box 2 to apply downward pressure to the plastic-coated blocks, and these mechanisms are all connected to the connecting base plate 3. This allows multiple plastic-coated blocks to be pressed downward simultaneously, ensuring that they receive the same pressure. A pushing mechanism is located inside the carrier box 2 to drive the pressure applying mechanisms downward, thereby achieving the pressure application purpose. The carrier box 2 also includes... A pressure sensor 11 is provided, and a digital display screen is provided on the top of the carrier box 2. The display screen works in conjunction with the pressure sensor 11, and the two are connected by wires to realize the conversion of pressure signal to electrical signal. This method is a common pressure sensing component on the market, and will not be described in detail here. The pressure sensor 11 is adapted to the pushing mechanism. The pressure sensor 11 can apply corresponding pressure to the plastic block by the contact force between the pushing mechanism and the pressure sensor 11. Multiple conversion shafts 13 are rotatably installed on the test bench 1. Four test platforms 14 are fixedly installed on each of the multiple conversion shafts 13 in a circular array. The friction coefficients of the four test platforms 14 on any one conversion shaft 13 are different, so as to provide wear test conditions with different friction coefficients. A reciprocating moving mechanism is provided on the top of the test bench 1 to drive the clamping mechanism to reciprocate for wear testing.

[0046] In the aforementioned clamping mechanisms, each clamping mechanism includes a U-shaped bracket 4. The U-shaped bracket 4 is fixedly connected to the connecting base plate 3 via two support rods. Clamping cylinders 401 are fixedly installed on both outer walls of the U-shaped bracket 4. The output shafts of the two clamping cylinders 401 extend into the U-shaped bracket 4 and are slidably connected to the U-shaped bracket 4. Side clamping plates 402 are fixedly installed on the output shafts of the two clamping cylinders 401. An adjusting screw 403 is threadedly installed on the top of the U-shaped bracket 4. Its bottom end extends into the U-shaped bracket 4 and is rotatably mounted on a lower pressure plate 404. A limit rod is fixedly installed on the top of the lower pressure plate 404. The top end of the limit rod extends above the U-shaped bracket 4 and is slidably connected to the top of the U-shaped bracket 4. In addition, a first set screw is threadedly installed on one side of the U-shaped bracket 4. Its end abuts against the limit rod, so that the lower pressure plate 404 can be stably restricted to a specified position.

[0047] In the aforementioned multiple pressure-applying mechanisms, each pressure-applying mechanism includes a guide block 5 disposed within the carrier box 2, and a lifting slide column 501 is fixedly installed at the bottom of the guide block 5. The bottom end of the lifting slide column 501 extends to the bottom of the carrier box 2 and is slidably connected to the bottom of the carrier box 2. The bottom end of the lifting slide column 501 is fixedly connected to the connecting base plate 3. A compression spring 502 is sleeved on the lifting slide column 501. The top end of the compression spring 502 is fixedly connected to the guide block 5, and the bottom end is fixedly connected to the bottom inner wall of the carrier box 2. A triangular top groove 503 is provided on one side of the guide block 5, and the triangular top groove 503 has a fitting inclined surface. In the provided push mechanism, a transverse pressure adjusting rod 6 is fixedly installed on the inner wall of one side of the carrier box 2. A slide block 602 is slidably mounted on the upper part of the support box 2. A second set screw is threaded on one side of the slide block 602, and its end abuts against the transverse pressure adjusting rod 6. A support plate 601 is fixedly mounted on the top inner wall of the support box 2. A pressure adjusting screw 603 is threaded on the support plate 601. One end of the pressure adjusting screw 603 is rotatably connected to the slide block 602. A connecting plate 604 is fixedly mounted on the bottom of the slide block 602. Multiple wedge-shaped top plates 605 are fixedly mounted on the bottom of the connecting plate 604. One side of each wedge-shaped top plate 605 extends into the corresponding triangular top groove 503. The wedge-shaped top plate 605 is adapted to the triangular top groove 503. When the wedge-shaped top plate 605 contacts the inclined surface of the triangular top groove 503, it will abut against the guide block 5, thereby lowering the U-shaped bracket 4 to achieve the purpose of applying pressure.

[0048] The aforementioned reciprocating mechanism includes a first rotary motor 12 fixedly installed on the top of the test bench 1. A turntable 1201 is fixedly installed on its output shaft, and an eccentric shaft 1202 is fixedly installed on the turntable 1201. A linkage seat 1203 is fixedly installed on the top of the carrier box 2. An elongated hole 1204 is provided on the linkage seat 1203. The eccentric shaft 1202 passes through the elongated hole 1204 and fits against the inner wall of the elongated hole 1204. Through the limiting between the guide rail and the slider, and in conjunction with the elongated hole 1204, the carrier box 2 can perform linear horizontal reciprocating motion when the eccentric shaft 1202 rotates with the turntable 1201, thereby enabling the plastic-coated block to undergo reciprocating friction testing.

[0049] In this embodiment, to ensure stable contact between the pressure sensor 11 and the slide 602, a reinforcing plate 7 is fixedly installed on the inner wall of the bearing box 2 away from the transverse pressure adjusting rod 6. One end of the transverse pressure adjusting rod 6 is fixedly connected to the reinforcing plate 7. Adjusting levers 8 are fixedly installed on the top inner wall of the bearing box 2 and the top of the reinforcing plate 7. The same mounting strip 9 is slidably installed on the two adjusting levers 8. A connecting rod 10 is fixedly installed on the side of the mounting strip 9 near the slide 602. The end of the connecting rod 10 near the slide 602 is fixedly connected to the pressure sensor 11. Two third set screws are threaded on the mounting strip 9. The ends of the two third set screws abut against the two adjusting levers 8 respectively. By moving the mounting strip 9, the pressure sensor 11 can move horizontally, thus making only contact with the slide 602. Then, by turning the pressure adjusting screw 603, pressure is applied between the slide 602 and the pressure sensor 11.

[0050] In this embodiment, to enable quick replacement of the test platform 14, a conversion shaft 13 is mounted on the test bench 1 via a damping shaft. This damping shaft provides a damping effect, allowing the conversion shaft 13 to rotate under certain resistance conditions, thus improving operational accuracy. Multiple conversion shafts 13 are each fixedly fitted with a conversion disc 15, and the outer wall of each of the multiple conversion discs 15 has four directional countersunk holes 16 arranged in a circular array, corresponding to the installation of the four test platforms 14. Furthermore, a mounting plate 17 is fixedly mounted on the side of the test bench 1 away from the carrier box 2, and a telescopic mechanism is fixedly mounted on the top of the mounting plate 17. A cylinder 18 has its output shaft passing through and slidably connected to a mounting plate 17. A fixed mounting plate 19 is fixedly mounted on the output shaft of the telescopic cylinder 18. Multiple hollow columns 20 are fixedly mounted on the bottom of the fixed mounting plate 19. The bottom of each hollow column 20 is open. A lifting plate 21 is slidably mounted on each hollow column 20. This sliding method is achieved by opening two sliding slots on the multiple hollow columns 20. The lifting plate 21 passes through the sliding slots and fits against the inner wall of the sliding slots. A handle is fixed on the side of the lifting plate 21 away from the test bench 1 for easy manual operation. A directional column 22 is provided inside each of the multiple hollow columns 20. The top of the multiple directional columns 22... Each is fixedly connected to the corresponding lifting plate 21. The bottom ends of the multiple directional columns 22 extend below the corresponding hollow column 20 and are inserted into the corresponding directional countersunk hole 16. Top springs 23 are fixedly installed on the top inner wall of the multiple hollow columns 20. The bottom ends of the multiple top springs 23 are fixedly connected to the corresponding lifting plate 21. Four indicator arc grooves arranged in a circular array are opened on the side of the multiple conversion discs 15 near the test bench 1. Multiple indicator pressure rods are slidably installed on the test bench 1. A baffle is fixedly installed on the side of the multiple indicator pressure rods away from the conversion discs 15. A return spring is sleeved on the multiple indicator pressure rods. One end of each indicator is fixedly connected to the corresponding baffle, and the other end is fixedly connected to the test platform 1. The end of the indicator rod inserted into the indicator arc groove is spherical, and the ends of multiple indicator rods away from the baffles are inserted into the corresponding indicator arc grooves. The insertion depth does not exceed the radius of the spherical end of the indicator rod. In this way, when the conversion shaft 13 is rotated, the indicator rod can automatically disengage from the indicator arc groove. When the indicator rod is inserted into the indicator arc groove, the operator can be subjected to the pressure from the top spring 23, thereby stopping the rotation. This ensures that the directional column 22 corresponds to the directional countersunk hole 16, and also ensures that the test platform 14 is switched into place.

[0051] In this embodiment:

[0052] In the initial state, the output shaft of the telescopic cylinder 18 is in the extended state;

[0053] Before testing, switch the corresponding test platform 14 according to the test requirements, rotating it to directly below the U-shaped bracket 4. During adjustment, first control the output shaft of the telescopic cylinder 18 to retract. Its output shaft drives the hollow column 20 to rise through the fixing plate 19. At this time, multiple directional columns 22 rise synchronously, eventually disengaging from the directional countersunk holes 16 on the corresponding conversion disc 15, releasing the fixed restriction on multiple conversion shafts 13. Then, rotate multiple conversion shafts 13 in sequence. The design of the damping shaft makes the conversion shaft 13 have a certain resistance when rotating, which facilitates operation. As multiple conversion shafts 13 rotate, the design of the damping shaft makes the conversion shaft 13 have a certain resistance when rotating, which facilitates operation. As the rotation of shaft 3 occurs, the four test platforms 14 with different friction coefficients on each conversion shaft 13 will also rotate. During the switching process, the prompting groove of the conversion disc 15 pushes the prompting pressure rod to move and compress the reset spring. When the target test platform 14 is in place, the prompting pressure rod is inserted into the corresponding prompting groove under the action of the reset spring, thus giving the operator a force reminder to stop the rotation and achieve precise positioning. Finally, the output shaft of the telescopic cylinder 18 is extended, and the directional column 22 is re-inserted into the corresponding directional countersunk hole 16 to fix the position of the conversion shaft 13, completing the switching of the test platform 14.

[0054] The friction bottoms of multiple plastic-coated blocks to be tested are then placed on the test platform 14 directly below the U-shaped bracket 4, with each block located within its corresponding U-shaped bracket 4. The clamping cylinder 401 on each U-shaped bracket 4 is then activated, its output shaft pushing the side clamping plate 402 to slide, clamping and positioning the plastic-coated blocks horizontally from both sides. Next, multiple first set screws are rotated in reverse to separate them from their corresponding limit rods. Then, multiple adjusting screws 403 are rotated, causing the corresponding lower pressure plate 404 to descend vertically along the limit rod, longitudinally compacting the plastic-coated blocks from the top. Finally, the first set screws are tightened to fix the position of the limit rods, completing the synchronous clamping of multiple plastic-coated blocks. This design avoids the problem of only being able to fix a single sample in a single test, laying the foundation for subsequent uniform pressure application.

[0055] After clamping, the pressing mechanism is driven by the pushing mechanism to apply uniform pressure to multiple plastic-coated blocks. Specifically, the two third set screws are first rotated in the opposite direction to separate them from the adjusting lever 8. Then, the mounting strip 9 is moved horizontally until the pressure sensor 11 contacts the slide 602 and the third set screw is tightened again. After that, the second set screw is rotated in the opposite direction to separate it from the transverse pressure adjusting lever 6. The pressure adjusting screw 603 is rotated to move the slide 602 laterally along the transverse pressure adjusting lever 6. As the slide 602 continues to move, the wedge-shaped top plate 605 pushes the guide block 5 to descend vertically through the inclined surface of the triangular top groove 503. This causes the lifting slide column 501 to move downwards and compresses the compression spring 502 sleeved on the lifting slide column 501. During the descent of the guide block 5, pressure is transmitted to the plastic-coated blocks in multiple clamping mechanisms through the connecting base plate 3, so that the bottom of the plastic-coated block is in close contact with the test platform 14. At the same time, the slide 602 will generate a squeezing force with the pressure sensor 11 during the movement, and the value will be displayed on the digital display screen. When the pressure value reaches the pressure requirement, the rotation of the pressure regulating screw 603 can be stopped, and then the second set screw can be tightened. At this time, the pressure application work of all plastic-coated blocks is completed.

[0056] Then, the first rotary motor 12 is started, and its output shaft drives the turntable 1201 to rotate, causing the eccentric shaft 1202 to move eccentrically along the elongated hole 1204 of the linkage seat 1203. Under the sliding cooperation of the guide rail and the slider, the carrier box 2 is driven to make reciprocating linear motion. In addition, the carrier box 2 drives multiple clamping mechanisms to move synchronously through the connecting base plate 3, so that the bottom of the clamped plastic block is continuously rubbed against the surface of the test platform 14, simulating the reciprocating wear process of the plastic block in actual working conditions. During this process, the reciprocating speed of the carrier box 2 is controlled by the rotation speed of the first rotary motor 12, and the reciprocating frequency of different test requirements can be adapted by adjusting the motor speed.

[0057] After the test is completed, the plastic-coated block that has completed the test can be removed, and its performance can be judged based on the degree of wear.

[0058] In subsequent applications, when multiple plastic-coated blocks of the same batch and model need to be worn under different friction coefficient test platforms 14, the multiple conversion shafts 13 can be rotated sequentially in the same manner as described above, and the four test platforms 14 with different friction coefficients can be aligned upwards with the corresponding U-shaped brackets 4. Then, the multiple plastic-coated blocks can be clamped, fixed, pressured, and subjected to reciprocating friction tests according to the same steps described above. Similarly, when testing plastic-coated blocks of different specifications and models simultaneously under the same pressure conditions, different plastic-coated blocks can be fixed in the multiple U-shaped brackets 4 respectively, and then the tests can be performed according to the same steps described above. The testing process is diversified, and the operation can be selected according to actual needs.

[0059] Furthermore, during the testing process, if it is necessary to switch one of the test platforms 14 individually, it can be done without activating the telescopic cylinder 18. Specifically, the corresponding lifting plate 21 is lifted upwards, bringing the corresponding directional column 22 out of the corresponding directional countersunk hole 16. At this time, the corresponding top spring 23 is compressed. Then, the corresponding conversion shaft 13 is rotated. After the corresponding test platform 14 is switched to the position directly below the U-shaped bracket 4, the lifting plate 21 is released. The compressed top spring 23 automatically brings the directional column 22 downwards and inserts it into the corresponding directional countersunk hole 16, thereby completing the switching of a single test platform 14.

[0060] Compared with related technologies, the reciprocating wear testing device for the plastic block covering the fork foot provided by the present invention has the following advantages:

[0061] I. This invention uses multiple U-shaped brackets 4 to simultaneously clamp multiple plastic-coated blocks, combined with a unified pressure application mechanism and a pushing mechanism, to avoid the limitation of testing only a single sample at a time, reduce the number of repeated clamping and adjustment, ensure pressure consistency in batch testing, and reduce data dispersion.

[0062] Second, the present invention uses the conversion shaft 13 to switch test platforms 14 with different friction coefficients, which can simulate complex actual working conditions and support the rapid switching of one or more test platforms 14, improve the diversity of test scenarios, and solve the problem of insufficient universality of single working condition testing.

[0063] Third, the present invention achieves precise control of the positioning and pressure adjustment of the test platform 14 through the prompting lever, pressure sensor 11 and digital display screen, and a single test platform 14 can be switched independently, further improving testing efficiency and ease of operation.

[0064] Second embodiment:

[0065] Based on the fork foot plastic block reciprocating wear testing device provided in the first embodiment of this application, the second embodiment of this application proposes another fork foot plastic block reciprocating wear testing device. The second embodiment is merely a further embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0066] The second embodiment of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0067] Please refer to the following: Figures 11-20The fork fork foot plastic block reciprocating wear testing device also includes a cleaning box 24 located below the conversion shaft 13. The bottom of the cleaning box 24 has a discharge port with a flip-top cover for easy discharge of debris. An exhaust pipe is fixedly installed on one side of the cleaning box 24 to ensure balanced air pressure inside. The top of the cleaning box 24 has multiple insertion slots 25 that fit the dimensions of the test platform 14, allowing the test platform 14 to be inserted precisely into the slots. Rectangular sleeves 26 are fixedly fitted onto each of the test platforms 14, and sealing rings 27 are fixedly installed at the bottom of each rectangular sleeve 26. When the test platform 14 is inserted into the insertion slot 25, a sealing ring 27 is formed between the sealing ring 27 and the cleaning box 24. To ensure a tight seal, two lifting slide rails are fixedly installed on the test bench 1, and two sliding plates 29 are slidably installed on the two lifting slide rails. One side of each sliding plate 29 is fixedly connected to the cleaning box 24. A hydraulic cylinder 28 located between the two lifting slide rails is fixedly installed on the test bench 1, and its output shaft is fixedly connected to the lower sliding plate 29. A liquid nitrogen spraying assembly 30 is provided on the test bench 1. The liquid nitrogen spraying assembly 30 includes a liquid nitrogen tank and a liquid nitrogen pump, which is a common liquid nitrogen generating device on the market. Two side strips are fixedly installed on the test bench 1, and the cleaning box 24 is located between the two side strips. The same horizontal main pipe 31 is fixedly installed on the side of the two side strips that are close to each other. The liquid nitrogen pump outlet in section 0 is connected to the horizontal main pipe 31 via the delivery pipe 32. An external housing 33 is fixedly installed on the side of the cleaning box 24 away from the test bench 1. The bottom of the external housing 33 is inclined. Multiple first connecting bends 34 are fixedly installed on the side of the external housing 33 away from the cleaning box 24. One end of each of the multiple first connecting bends 34 is fixedly installed with one end of a compensating hose 35. The other end of each of the multiple compensating hoses 35 is fixedly connected to the horizontal main pipe 31. The other end of each of the multiple first connecting bends 34 is located inside the external housing 33 and is fixedly installed with one end of a telescopic pipe 36. The other end of each of the multiple telescopic pipes 36 is fixedly installed with one end of a second connecting bend 37. The other end of each of the multiple second connecting bends 37 is fixedly installed with a flared end. Each horn-shaped opening is located below multiple insertion ports 25. Multiple first connecting rods 40 are slidably installed on the side of the external housing 33 away from the cleaning box 24. One end of each first connecting rod 40 is inside the external housing 33, and the other end is outside the external housing 33. The ends of the multiple first connecting rods 40 inside the external housing 33 are all fixedly connected to corresponding second connecting tubes 37. A first rodless cylinder 38 is fixedly installed on the top of the external housing 33. A linkage folding bar 39 is fixedly installed on the slider of the first rodless cylinder 38. The bottom of the linkage folding bar 39 is fixedly connected to the multiple first connecting rods 40. A second rodless cylinder 41 is fixedly installed on one side of the outer wall of the cleaning box 24. Two second connecting rods 4101 are fixedly installed on the slider of the second rodless cylinder 41.Both second connecting rods 4101 pass through and are slidably connected to the cleaning box 24. Multiple concave brackets 4102 are fixedly mounted on the two second connecting rods 4101. The concave brackets 4102 are located inside the cleaning box 24, and brush rollers 4103 are rotatably mounted within each of the multiple concave brackets 4102. The multiple brush rollers 4103 are staggered with multiple insertion slots 25, and a second rotary motor is fixedly mounted on one outer wall of each of the multiple concave brackets 4102. The output shafts of the multiple second rotary motors are respectively fixedly connected to one end of each of the multiple brush rollers 4103.

[0068] In addition, valves are provided on multiple first connecting tubes 34. By controlling the opening and closing of the valves, liquid nitrogen can be sprayed onto the test platform 14 that needs to be cleaned. The operation can be selected according to the actual number of test platforms 14 to be cleaned.

[0069] In this embodiment:

[0070] After the test is completed, the plastic-coated block will melt and solidify on the test platform 14 due to high temperature friction, resulting in solidified residue. In order to clean the test platform 14 quickly and not delay subsequent use, the conversion shaft 13 can be rotated to rotate the used test platform 14 to the downward position. Then, the hydraulic cylinder 28 is started, and its output shaft pushes the cleaning box 24 up along the lifting slide rail through the sliding plate 29, so that the test platform 14 passes through the insertion port 25 at the top of the cleaning box 24, and finally the sealing ring 27 on the rectangular sleeve 26 abuts against the top of the cleaning box 24, ensuring the seal between the cleaning box 24 and the test platform 14.

[0071] Then, the liquid nitrogen spraying assembly 30 is activated. Liquid nitrogen enters the horizontal main pipe 31 through the delivery pipe 32, and is sprayed out from the horn through the compensation hose 35, the first connecting bend pipe 34, the telescopic pipe 36 and the second connecting bend pipe 37 to cool the plastic block on the friction surface of the test platform 14, making the plastic block brittle instantly. Then, the liquid nitrogen spraying assembly 30 is turned off, and the first rodless cylinder 38 is activated. The slider on it moves horizontally with the linkage bend bar 39. Under the action of the telescopic pipe 36, the horn on the second connecting bend pipe 37 is gradually moved away from the bottom of the test platform 14 until the horn is moved into the external housing 33.

[0072] Next, the second rodless cylinder 41 is activated, and its slider drives multiple concave brackets 4102 to move back and forth via the second connecting rod 4101. At the same time, the second rotary motor is activated to drive the brush roller 4103 to rotate, cleaning the plastic debris on the surface of the test platform 14. The debris and residual liquid nitrogen are temporarily stored in the cleaning box 24. Later, the flip cover can be opened to discharge the debris and residual liquid nitrogen through the discharge port. In addition, the exhaust pipe can balance the air pressure in the cleaning box 24 to ensure the cleaning effect.

[0073] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A device for testing the reciprocating wear of a plastic-coated fork foot, comprising a test stand, characterized in that, A carrier box is slidably mounted on one side of the test bench. A connecting base plate is provided below the carrier box. Multiple clamping mechanisms are fixedly mounted on the bottom of the connecting base plate to fix the plastic-coated block. Multiple pressure applying mechanisms are provided inside the carrier box to apply downward pressure to the plastic-coated block. All of the multiple pressure applying mechanisms are connected to the connecting base plate. The carrier box is equipped with a pushing mechanism to drive the pressure applying mechanism to descend and achieve the purpose of applying pressure. The carrier box is equipped with a pressure sensor, which is adapted to the pushing mechanism. Multiple conversion shafts are rotatably mounted on the test bench. Four test platforms are fixedly mounted on each of the multiple conversion shafts in a circular array. The friction coefficients of the four test platforms on any one conversion shaft are different. The top of the test bench is equipped with a reciprocating moving mechanism to drive the clamping mechanism to reciprocate for wear testing. The conversion shafts are mounted on the test bench via damping shafts. Multiple conversion shafts are each fixedly fitted with a conversion disc. Each of the multiple conversion discs has four directional countersunk holes arranged in a circular array on its outer wall. A mounting plate is fixedly mounted on the side of the test bench away from the carrier box. A telescopic cylinder is fixedly mounted on the top of the mounting plate. The output shaft of the telescopic cylinder passes through the mounting plate and is slidably connected to it. A fixing plate is fixedly mounted on the output shaft of the telescopic cylinder. Multiple hollow columns are fixedly mounted on the bottom of the fixing plate. The bottom of each hollow column is open. A lifting plate is slidably mounted on each of the multiple hollow columns. Each of the multiple hollow columns contains a directional column. The top of each directional column is fixedly connected to a corresponding lifting plate, and the bottom of each directional column is... Extending to the bottom of the corresponding hollow column and inserted into the corresponding directional countersunk hole, a top spring is fixedly installed on the top inner wall of each of the hollow columns, and the bottom end of each of the top springs is fixedly connected to the corresponding lifting plate. Each of the multiple conversion discs has four indicator arc grooves arranged in a ring array on the side near the test bench. Multiple indicator pressure rods are slidably installed on the test bench. A baffle is fixedly installed on the side of each of the indicator pressure rods away from the conversion disc. A return spring is sleeved on each of the indicator pressure rods. One end of each of the return springs is fixedly connected to the corresponding baffle, and the other end is fixedly connected to the test bench. The end of each of the indicator pressure rods away from the baffle is inserted into the corresponding indicator arc groove, and the end of the indicator pressure rod inserted into the indicator arc groove is spherical.

2. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 1, characterized in that, In a plurality of clamping mechanisms, each clamping mechanism includes a U-shaped bracket. The U-shaped bracket is fixedly connected to the connecting base plate by two support rods. Clamping cylinders are fixedly installed on both outer walls of the U-shaped bracket. The output shafts of the two clamping cylinders extend into the U-shaped bracket and are slidably connected to the U-shaped bracket. Side clamping plates are fixedly installed on the output shafts of the two clamping cylinders. An adjusting screw is threadedly installed on the top of the U-shaped bracket. The bottom end of the adjusting screw extends into the U-shaped bracket and is rotatably installed with a lower pressure plate. A limit rod is fixedly installed on the top of the lower pressure plate. The top end of the limit rod extends above the U-shaped bracket and is slidably connected to the top of the U-shaped bracket. A first set screw is threadedly installed on one side of the U-shaped bracket. The end of the first set screw abuts against the limit rod.

3. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 1, characterized in that, In each of the plurality of pressure-applying mechanisms, a guide block is included. The guide block is disposed inside the carrier box. A lifting slide column is fixedly installed at the bottom of the guide block. The bottom end of the lifting slide column extends to the bottom of the carrier box and is slidably connected to the bottom of the carrier box. The bottom end of the lifting slide column is fixedly connected to the connecting base plate. A compression spring is sleeved on the lifting slide column. The top end of the compression spring is fixedly connected to the guide block, and the bottom end is fixedly connected to the bottom inner wall of the carrier box. A triangular top groove is formed on one side of the guide block.

4. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 3, characterized in that, The jacking mechanism includes a transverse pressure adjusting rod, which is fixedly installed on one inner wall of the bearing box. A slide block is slidably installed on the transverse pressure adjusting rod, and a second set screw is threaded onto one side of the slide block. The end of the second set screw abuts against the transverse pressure adjusting rod. A support plate is fixedly installed on the top inner wall of the bearing box, and a pressure adjusting screw is threaded onto the support plate. One end of the pressure adjusting screw is rotatably connected to the slide block. A connecting plate is fixedly installed at the bottom of the slide block, and multiple wedge-shaped top plates are fixedly installed at the bottom of the connecting plate. One side of each of the multiple wedge-shaped top plates extends into the corresponding triangular top groove, and the wedge-shaped top plate is adapted to the triangular top groove.

5. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 4, characterized in that, A reinforcing plate is fixedly installed on the inner wall of the bearing box away from the transverse pressure adjusting rod. One end of the transverse pressure adjusting rod is fixedly connected to the reinforcing plate. Adjusting levers are fixedly installed on the top inner wall of the bearing box and the top of the reinforcing plate. The same mounting strip is slidably installed on the two adjusting levers. A connecting rod is fixedly installed on the side of the mounting strip near the slide. The end of the connecting rod near the slide is fixedly connected to the pressure sensor. Two third set screws are threaded on the mounting strip. The ends of the two third set screws abut against the two adjusting levers respectively.

6. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 1, characterized in that, The reciprocating movement mechanism includes a first rotary motor, which is fixedly installed on the top of the test bench. A turntable is fixedly installed on the output shaft of the first rotary motor, and an eccentric shaft is fixedly installed on the turntable. A linkage seat is fixedly installed on the top of the carrier box, and an elongated hole is opened on the linkage seat. The eccentric shaft passes through the elongated hole and fits against the inner wall of the elongated hole.

7. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 1, characterized in that, Two guide rails are fixedly installed on the side of the test bench near the carrier box. Two sliders are slidably installed on each of the two guide rails. One side of each of the four sliders is fixedly connected to the carrier box. A digital display screen is provided on the top of the carrier box, and the digital display screen is used in conjunction with the pressure sensor.

8. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 1, characterized in that, A cleaning box is located below the conversion shaft. The top of the cleaning box has multiple insertion slots adapted to the dimensions of the test platform. Rectangular sleeves are fixedly fitted onto each of the test platforms, and sealing rings are fixedly installed at the bottom of each rectangular sleeve. Two lifting slide rails are fixedly mounted on the test frame, and two sliding plates are slidably mounted on the two lifting slide rails. One side of each sliding plate is fixedly connected to the cleaning box. A hydraulic cylinder is fixedly mounted on the test frame between the two lifting slide rails, and the output shaft of the hydraulic cylinder is fixedly connected to the sliding plate below. A liquid nitrogen spray assembly is provided on the test frame. Two side connectors are fixedly installed, with the cleaning box located between them. A common horizontal main pipe is fixedly installed on the side of the two side connectors that are close to each other. The liquid nitrogen spraying assembly is connected to the horizontal main pipe via a delivery pipe. An external housing is fixedly installed on the side of the cleaning box away from the test bench. The bottom of the external housing is sloped. Multiple first connecting bends are fixedly installed on the side of the external housing away from the cleaning box. One end of each of the multiple first connecting bends is fixedly connected to one end of a compensating hose. The other ends of the multiple compensating hoses are fixedly connected to the horizontal main pipe. The other ends of the multiple first connecting bends are located inside the external housing and fixed. One end of the telescopic tube is installed, and the other end of each of the multiple telescopic tubes is fixedly installed with one end of a second connecting folding tube. The other end of each of the multiple second connecting folding tubes is fixedly installed with a flared opening, which is located below each of the multiple insertion ports. Multiple first connecting rods are slidably installed on the side of the external housing away from the cleaning box. One end of each first connecting rod is inside the external housing, and the other end is outside the external housing. The ends of the multiple first connecting rods inside the external housing are fixedly connected to corresponding second connecting folding tubes. A first rodless cylinder is fixedly installed on the top of the external housing. A linkage folding bar is fixedly installed on the slider of the first rodless cylinder. The bottom of the strip is fixedly connected to multiple first connecting rods. A second rodless cylinder is fixedly installed on one side of the outer wall of the cleaning box. Two second connecting rods are fixedly installed on the slider of the second rodless cylinder. Both second connecting rods pass through the cleaning box and are slidably connected to it. Multiple concave brackets are fixedly installed on the two second connecting rods. The concave brackets are located inside the cleaning box. Brush rollers are rotatably installed in each of the multiple concave brackets. The multiple brush rollers are staggered with multiple insertion ports. A second rotary motor is fixedly installed on one side of the outer wall of each of the multiple concave brackets. The output shafts of the multiple second rotary motors are respectively fixedly connected to one end of the multiple brush rollers.

9. The reciprocating wear testing device for the plastic-coated block of the shift fork foot according to claim 8, characterized in that, The bottom of the cleaning box has a discharge port, and the bottom of the discharge port is fastened with a flip cover. The liquid nitrogen spraying assembly includes a liquid nitrogen tank and a liquid nitrogen pump. The outlet of the liquid nitrogen pump is fixedly connected to the delivery pipe. Valves are provided on multiple first connecting pipes. An exhaust pipe is fixedly installed on one side of the cleaning box.

Images