Compatible friction testing machine

Abstract

The invention discloses a compatible friction testing machine. The compatible friction testing machine mainly comprises a main body, the PLC control system is arranged in the main body; a mounting rack; the loading rod is arranged above the mounting frame; the loading assembly comprises a loading bracket mounted on the main body, and a driving part I is fixedly mounted at the upper end of the loading bracket; the reciprocating assembly comprises a second driving part fixedly installed on the main body, and a reciprocating rod is connected to the main body in a sliding mode; the third driving part is arranged below the mounting frame; the switching assembly is installed on the main body and comprises a sliding plate connected to the main body in a sliding mode, a shifting rod is connected to one side of the sliding plate through a bearing, third elastic parts are fixedly installed between the two sides of the shifting rod and the sliding plate, a guide plate is fixedly installed on the main body, and a rotary sliding groove is formed in the inner side of the guide plate; a sliding rod is mounted at one end of the deflector rod away from the sliding plate.

Description

Technical Field

[0001] The invention relates to the technical field of friction and wear testing machines, in particular to a compatible friction testing machine. Background Art

[0002] A tribometer is a test device used to simulate the friction and wear behavior of materials in high-temperature environments. It is widely used in fields such as materials science, mechanical engineering, and petrochemical engineering. Common tribometers include reciprocating tribometers and rotary tribometers, which test the wear performance of samples by reciprocating sliding and rotating methods respectively. However, when users conduct wear performance tests for different tests, they need friction testers with different friction modes. However, the existing friction testers have a single function and cannot meet the requirements of reciprocating sliding and rotating friction tests at the same time. Users need to purchase two friction testers separately to meet the test needs, which causes a waste of funds and occupies a large amount of space. Therefore, it is necessary to provide a compatible friction tester to solve the above problems.

[0003] It should be noted that the above information disclosed in this Background section is only for understanding the background of the present inventive concept and therefore it may contain information that does not constitute the prior art. Summary of the Invention

[0004] The object of the present invention is to provide a compatible friction testing machine to solve the problems raised in the above background technology.

[0005] By adopting the above technical solution, the effect of friction testing compatible with reciprocating sliding and rotation is achieved.

[0006] The technical solution adopted by the present application to solve its technical problems is: a compatible friction testing machine, including a main body; a PLC control system, the PLC control system is installed in the main body, the PLC control system is used to control various electrical components; a mounting frame, the mounting frame is installed on the main body, the mounting frame is used to install a sample; a loading rod, the loading rod is arranged above the mounting frame; a loading assembly, the loading assembly is installed on the main body, the loading assembly includes a loading bracket installed on the main body, the upper end of the loading bracket is fixedly installed with a driving part 1, the driving part 1 is connected to the PLC control system signal; a reciprocating assembly, the reciprocating assembly is installed on the main body, the reciprocating assembly includes a driving part 2 fixedly installed on the main body, the driving part Part two is connected to the PLC control system signal, and a reciprocating rod is slidably connected to the main body; a driving part three is arranged below the mounting frame, and the output shaft of the driving part three is coaxially fixed with the mounting frame, and the driving part three is connected to the PLC control system signal; a switching component is installed on the main body, and the switching component includes a slide plate slidably connected to the main body, the slide plate is fixedly connected to the driving part three, and a bearing on one side of the slide plate is connected to a shift rod, and an elastic part three is fixedly installed between the two sides of the shift rod and the slide plate, a guide plate is fixedly installed on the main body, a rotary slide groove is provided on the inner side of the guide plate, and a slide rod is installed on the end of the shift rod away from the slide, and the slide rod is suitable for sliding in the rotary slide groove.

[0007] Furthermore, a loading slider is slidably connected to the inner side of the loading bracket, and the loading slider is threadedly connected to the output end of the driving unit 1. The lower end of the loading slider abuts against the upper end of the loading rod, and the loading slider is suitable for sliding up and down in the vertical direction when the output end of the driving unit 1 moves forward and reverse.

[0008] Furthermore, a disc is fixedly mounted on the output end of the second driving part, a connecting rod is connected to a bearing on one side of the disc, one end of the reciprocating rod is connected to the connecting rod bearing, the reciprocating rod is suitable for sliding back and forth through the connecting rod when the disc rotates, and the end of the reciprocating rod away from the connecting rod is slidably connected to the loading rod.

[0009] Furthermore, slideway 1, slideway 2 and slideway 3 are provided in the rotary slide chute, the lower end bearing of the slide rod is connected to the gear bracket, the upper bearing of the gear bracket is connected to the positioning gear, the gear bracket is fixedly installed with a driving unit 4, the driving unit 4 is connected to the PLC control system signal, the output end of the driving unit 4 is coaxially fixed with the positioning gear, the driving unit 4 is installed with an encoder, the encoder is connected to the PLC control system signal, the rack 1, rack 2 and rack 3 are fixedly installed on the main body, the positioning gear is adapted to mesh with the rack 1 when the slide rod slides to the slide 1, the positioning gear is adapted to mesh with the rack 2 when the slide rod slides to the slide 2, the positioning gear is adapted to mesh with the rack 3 when the slide rod slides to the slide 3, a sensor 1 is installed in the slide 2, a sensor 2 is installed at the outlet of the rotary slide, a stopper is fixedly installed on the main body, and an elastic part 2 is fixedly installed on the side of the slide plate close to the stopper; Wherein: the second driving part is adapted to enter the standby state when the first sensor detects the slide bar, and the second driving part is adapted to exit the standby state when the second sensor detects the slide bar.

[0010] Furthermore, a sliding cabin is provided inside the side of the skateboard away from the shift rod, a piston is slidably connected in the sliding cabin, an elastic part is provided on both sides of the piston, a pressure sensor is installed on the piston, the pressure sensor is connected to the PLC control system signal, the pressure sensor is used to detect the pressure of the elastic part, and a handle is fixedly connected to the end of the piston away from the skateboard.

[0011] Furthermore, the drive unit four has a self-locking function when the power is off, and a friction plate is installed on the output shaft of the drive unit four, and the friction plate is used to increase the resistance to manual rotation of the output shaft of the drive unit four.

[0012] Furthermore, a guide rod is fixedly installed on one side of the gear bracket, a guide block is slidably connected to the main body, and the guide block is slidably connected to the guide rod.

[0013] Furthermore, the sliding rod is a cylindrical structure and is made of wear-resistant material.

[0014] Furthermore, a guide rail slider is provided between the loading slider and the loading rod.

[0015] Compared with the prior art, the beneficial effect of the present invention is that the compatible friction testing machine provided in the present application, through the cooperation of the positioning gear and the driving part four, can conveniently switch between reciprocating sliding, rotation and reciprocating sliding and rotation composite friction testing modes when adjusting the relative position of the specimen and the loading rod, thereby improving the compatibility of the friction testing machine and reducing the testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of a compatible friction testing machine in this application; Figure 2 for Figure 1 A front cross-sectional schematic diagram of ; Figure 3 for Figure 2 A schematic diagram of the cross section of the middle A area; Figure 4 for Figure 2 A magnified schematic diagram of area B in the middle; Figure 5 for Figure 4 A partial cross-sectional diagram of ; In the figure: 1. Main body; 2. Mounting frame; 3. Slide plate; 4. Handle; 5. Loading rod; 6. Loading bracket; 7. Loading slide block; 8. Drive unit 1; 9. Reciprocating rod; 10. Drive unit 2; 11. PLC control system; 12. Disc; 13. Connecting rod; 14. Guide plate; 15. Drive unit 3; 16. Sliding cabin; 17. Piston; 18. Pressure sensor; 19. Elastic unit 1; 20. Elastic unit 2; 21. Stop block; 22. Drive unit 4; 23. Gear bracket; 24. Positioning gear; 25. Rack 1; 26. Rack 2; 27. Rack 3; 28. Guide block; 29. ​​Guide rod; 30. Elastic unit 3; 31. Drag rod; 32. Slideway 1; 33. Slideway 2; 34. Slideway 3; 35. Sensor 1; 36. Sensor 2; 37. Slide rod; 38. First corner; 39. Second corner DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] A tribometer is a test device used to simulate the friction and wear behavior of materials in high-temperature environments. Different friction test methods are required for testing different specimens, such as reciprocating, rotary, or electric heating or furnace heating systems. The materials are heated to a set high temperature while applying a controllable load and relative motion to simulate the contact of friction pairs under actual working conditions. Various monitoring and sensing instruments are used to monitor the specimens, recording data such as friction coefficient, wear volume, and surface morphology changes to reveal the material's wear resistance, thermal stability, and lubricity at high temperatures. However, the commonly used friction testing machine can only perform one test method and cannot meet the testing requirements of various samples. Therefore, the mechanical structure of the friction testing machine is improved; like Figure 1-2 As shown, the present application provides a compatible friction tester, including a main body 1, which is a welded frame structure of stainless steel pipes and stainless steel plates. A PLC control system 11 is fixedly installed on the inner side of the main body 1. The PLC control system 11 is used to control various electrical components inside the friction tester; The main body 1 is connected to a slide plate 3 via a guide rail slider. The slide plate 3 can slide in the left and right directions of the main body 1. The lower end of the slide plate 3 is fixedly mounted with a driving unit 3 15. The driving unit 3 15 is a servo motor. The driving unit 3 15 is connected to the PLC control system 11 by signal. The start and stop of the driving unit 3 15 can be controlled by the PLC control system 11. The upper end of the main body 1 is provided with an avoidance long waist groove for the driving unit 3 15 to slide left and right following the slide plate 3. The slide 3 is connected to the main body 1 via a guide rail slider, thereby enabling the slide 3 to slide left and right. A guide rail clamp (not shown) is installed on the guide rail slider connecting the slide 3 and the main body 1. The guide rail clamp is a standard accessory for the guide rail slider and is used to fix the relative position of the guide rail slider. The position of the slide 3 can be controlled by manually operating the guide rail clamp. The upper end of the slide 3 is connected to the mounting frame 2 by a bearing. The mounting frame 2 is a circular structure. The output end of the driving unit 3 15 is coaxially fixedly connected to the lower end of the mounting frame 2. The upper end of the mounting frame 2 is used to fix the sample to be tested. When the driving unit 3 15 is started, it will drive the mounting frame 2 to rotate synchronously, thereby providing the sample with an operating state for the rotation friction test. A loading assembly is mounted on the upper end of the main body 1. The loading assembly includes a loading bracket 6. A fixed bracket is welded and fixed to the main body 1. The upper end of the fixed bracket is connected to the loading bracket 6 with a bearing. The loading bracket 6 can rotate horizontally around the fixed bracket. The fixed bracket is provided with a locking screw. The locking screw fixes the horizontal position of the loading bracket 6 by tightening. A driving unit 8 is fixedly mounted on the upper end of the loading bracket 6 away from the fixed bracket. The driving unit 8 is a servo motor and is connected to the PLC control system 11 by signal. A loading slider 7 is slidably connected to the inner side of the loading bracket 6. The loading slider 7 is located directly below the driving unit 8. The upper end of the loading slider 7 is threadedly connected to the output end of the driving unit 8. The loading slider 7 is suitable for sliding up and down in the vertical direction when the output end of the driving unit 8 moves forward and reverse. The main body 1 is also equipped with a reciprocating assembly, which includes a driving part 2 10 fixedly mounted on the main body 1. The driving part 2 10 is a servo motor. The driving part 2 10 is connected to the PLC control system 11 by signal. A disc 12 is fixedly mounted on the output end of the driving part 2 10. The axis of the disc 12 is parallel to the horizontal plane. A small shaft is fixedly mounted on the front circumference of the disc 12. A connecting rod 13 is connected to the bearing on the small shaft. A reciprocating rod 9 is slidably connected to the main body 1. The reciprocating rod 9 can slide left and right above the main body 1. One end of the reciprocating rod 9 is connected to the connecting rod 13 by bearing. When the driving part 2 10 is powered on, the disc 12 rotates along with the driving part 2 10 , and the reciprocating rod 9 is adapted to slide back and forth through the connecting rod 13 when the disc 12 rotates, thereby providing an operating state for the reciprocating friction test of the sample; The end of the reciprocating rod 9 away from the connecting rod 13 is slidably connected to the loading rod 5, which is used to perform wear detection on the sample. The loading rod 5 is located above the mounting frame 2, and the lower end of the loading rod 5 abuts against the test piece, and the upper end of the loading rod 5 abuts against the lower end of the loading slider 7; When the control driving unit 8 is started, the loading slide block 7 slides downward through the threaded connection, and the loading slide block 7 gradually increases the load pressure on the sample fixed on the mounting frame 2 through the loading rod 5, thereby providing the load required for the sample friction test; When the control driving part 2 10 is started, the disc 12 drives the reciprocating rod 9 to slide left and right through the connecting rod 13, and the loading rod 5 connected to the reciprocating rod 9 will also slide left and right along with the reciprocating rod 9, thereby achieving the effect of performing a reciprocating friction test on the sample; While the second dynamic driving part 10 is not started, the position of the reciprocating rod 9 is fixed, and the contact position between the lower end of the loading rod 5 and the test piece is adjusted by adjusting the left and right positions of the slide plate 3. When the third driving part 15 is started, the sample rotates along with the mounting frame 2, thereby achieving the effect of performing a rotational friction test on the sample; In order to reduce the wear of the contact surface between the upper end of the loading rod 5 and the loading slider 7 during the reciprocating friction test, a guide slider is installed between the loading slider 7 and the loading rod 5. The guide slider is installed at the lower end of the loading slider 7, and the upper end of the loading rod 5 abuts on the slider. Therefore, when the loading slider 7 adds load to the loading rod 5, the upper end of the loading rod 5 will not suffer serious wear during the reciprocating motion through the connection of the guide slider, thereby improving the service life. like Figure 2 、 Figure 4-Figure 5As shown, in order to conveniently switch the test mode of the specimen, a switching assembly is installed on the main body 1. The switching assembly includes a guide plate 14 fixedly mounted on the main body 1. A rotary slide groove is provided on the inner side of the lower end of the guide plate 14. A lever 31 is connected to the left bearing of the slide 3. The lever 31 can rotate horizontally around the connection with the slide 3. Elastic parts 30 are fixedly mounted between the two sides of the lever 31 and the slide 3. The position of the lever 31 can be restricted by the elastic parts 30 on both sides of the lever 31. When it is not subjected to external force, the length direction of the lever 31 is parallel to the sliding direction of the slide 3. This position is set as the static position of the lever 31. A sliding rod 37 is fixedly mounted on the end of the lever 31 away from the slide 3. The sliding rod 37 is adapted to slide in a rotary chute. An entrance and an exit are provided on the side of the rotary chute close to the slide 3. When the lever 31 slides along the slide 3 toward the guide plate 14, the lever 31 will not rotate freely due to the restriction of the elastic portion 30. The sliding rod 37 will first enter the entrance of the rotary chute and can exit from the exit along the rotary chute. The rotary chute is provided with a slideway 1 32, a slideway 2 33 and a slideway 34. The slide rod 37 entering from the rotary chute entrance will pass through the slideway 1 32, the slideway 2 33 and the slideway 34 in sequence. The slideways 1 32, 33 and 34 are all on the same side of the stationary position of the lever 31. A stopper 21 is fixedly mounted on the upper end of the main body 1, and a second elastic portion 20 is fixedly mounted on the side of the slide plate 3 close to the stopper 21. When the slide plate 3 slides toward the guide plate 14 so that the slide rod 37 moves to the entrance of the rotary chute, the second elastic portion 20 will abut against the stopper 21. When the slide plate 3 continues to slide toward the guide plate 14, the second elastic portion 20 will apply an elastic force in the opposite direction of the slide plate 3. like Figure 5 As shown, when the control slide 3 drives the slide bar 37 on the lever 31 to slide toward the guide plate 14, the slide bar 37 enters the entrance of the rotary chute, and after sliding through the slideway 1 32, it is blocked by the first corner 38 of the rotary chute and cannot slide further. At this time, the control of the slide 3 is released, and the slide 3 slides away from the guide plate 14 under the elastic force of the elastic part 20, and the lever 31 rotates toward the static position under the elastic force of the elastic parts 30 on both sides, so that the slide bar 37 automatically slides The slide 3 moves to the second slideway 33 and stops, and the slide plate 3 is pushed to slide toward the guide plate 14 again. During the sliding process of the slide bar 37, the lever 31 rotates toward the static position under the elastic force of the third elastic parts 30 on both sides, so that the slide bar 37 is blocked by the second corner 39 of the rotary chute and cannot slide further. The control of the slide plate 3 is released again, and the slide plate 3 slides away from the guide plate 14 under the elastic force of the second elastic part 20, so that the slide bar 37 passes through the third slideway 34 and disengages from the exit of the rotary chute; In order to increase the service life of the slide bar 37, the slide bar 37 is a cylindrical structure and is made of wear-resistant stainless steel; The lower end bearing of the slide bar 37 is connected to the gear bracket 23, and the upper bearing of the gear bracket 23 is connected to the positioning gear 24. The drive unit 22 is fixedly mounted on the gear bracket 23. The drive unit 22 is a servo motor. The drive unit 22 is connected to the PLC control system 11 for signal. The output end of the drive unit 22 is coaxially fixed with the positioning gear 24. The drive unit 22 is mounted on the encoder. The encoder is connected to the PLC control system 11 for signal. The encoder can record the number of revolutions of the drive unit 22. The drive unit 22 has a power-off self-locking function. When the drive unit 22 is in the power-off state, the positioning gear 24 will not rotate. A friction plate is installed on the output shaft of the drive unit 22. When the drive unit 22 is powered, the friction plate can increase the resistance to manual rotation of the output shaft of the drive unit 22. The friction plate increases the rotational resistance of the drive unit 22 when it is powered, thereby improving the stability of the test position adjustment of the specimen. Rack 1 25 , rack 2 26 , and rack 3 27 are fixedly mounted on the main body 1 . The positioning gear 24 is adapted to mesh with rack 1 25 when the slide bar 37 slides into the slideway 1 32 . The positioning gear 24 is adapted to mesh with rack 2 26 when the slide bar 37 slides into the slideway 2 33 . The positioning gear 24 is adapted to mesh with rack 3 27 when the slide bar 37 slides into the slideway 3 34 . When the slide bar 37 slides to the slideway 1 32, the driving part 22 is in an unpowered state, and the positioning gear 24 cannot rotate, so that the positioning gear 24 is blocked by the rack 1 25. At this time, the driving part 22 is powered, the positioning gear 24 can rotate, and the slide 3 can continue to move toward the guide plate 14. At this time, the encoder can confirm the position of the slide 3 while recording the number of rotations of the driving part 22, that is, the contact position between the sample and the loading rod 5. When the encoder is running, the friction tester is set to the rotating friction test state through the PLC control system 11, and the driving part 3 15 is turned on. Entering the standby state, the standby state means that the drive unit 3 15 is in a zero-torque energized state and can respond to the start command immediately. When the machine is started, the drive unit 3 15 will be controlled to start, so that the mounting frame 2 drives the sample to rotate to perform the rotational friction test. When the encoder records the rotation path and distance of the positioning gear 24 and calculates the separation from the rack 1 25 through the PLC control system 11, the drive unit 3 15 will exit the standby state. Similarly, when the slide bar 37 slides to the slideway 3 34 and the positioning gear 24 is engaged with the rack 3 27, the friction test machine will also start the rotational friction test state. A sensor 1 35 is installed in the slideway 2 33, and a sensor 2 36 is installed at the exit of the rotary slideway. Both the sensor 1 35 and the sensor 2 36 are connected to the PLC control system 11 signal. Both the sensor 1 35 and the sensor 2 36 are proximity photoelectric sensors. When the slide bar 37 is detected, a signal will be sent to the PLC control system 11. When the slide bar 37 slides to the position of the slideway 2 33, the positioning gear 24 will be blocked by the rack 2 26. At this time, the driving part 4 22 is energized, and the positioning gear 24 can rotate and enter into a meshing state with the rack 2 26. The slide bar 37 follows the elastic force of the elastic part 20. The slide plate 3 slides smoothly to the side of the slideway 2 33 close to the block 21. At this time, the sensor 1 35 will detect the slide bar 37, thereby controlling the drive unit 2 10 to enter the standby state through the PLC control system 11. The standby state means that the drive unit 2 10 is in a zero-torque power-on state and can immediately respond to the start command. When the friction tester is started, the reciprocating rod 9 drives the loading rod 5 to slide back and forth, thereby performing a reciprocating friction test. When the slide bar 37 slides out of the rotary chute exit, the sensor 2 36 will detect the slide bar 37, thereby controlling the drive unit 2 10 to exit the standby state through the PLC control system 11. When the slide bar 37 slides to the position of the slideway 3 34, the positioning gear 24 is controlled to mesh with the rack 3 27, and the drive unit 3 15 enters the standby state. At this time, the drive unit 2 10 is still in the standby state. Therefore, in this state, a reciprocating and rotating composite friction test can be performed on special samples, thereby improving the applicability of the friction tester. like Figure 3 As shown, in order to conveniently control the sliding of the slide plate 3 and the start and stop of the driving part 22, a sliding chamber 16 is opened inside the side of the slide plate 3 away from the lever 31. A piston 17 is slidably connected to the sliding chamber 16. Elastic parts 19 are placed on both sides of the piston 17. The elastic parts 19 are springs. A pressure sensor 18 is installed on the piston 17. The pressure sensor 18 is connected to the PLC control system 11 for signal connection. The pressure sensor 18 is used to detect the pressure of the elastic part 19. The end of the piston 17 away from the slide plate 3 is fixedly connected to the handle 4. The sliding of the slide plate 3 can be conveniently controlled by holding the handle 4, and the pressure sensor 18 can detect the resistance encountered by the sliding of the slide plate 3. The rated pressure of the pressure sensor 18 is set in the PLC control system 11. When the handle 4 is pushed or pulled, the piston 17 slides in the sliding chamber 16, and the elastic part 19 in the sliding direction of the piston 17 will be deformed. At the same time, the elastic part 19 on this side will generate pressure on the pressure sensor 18. When the sliding distance of the piston 17 exceeds its own thickness, the pressure of the elastic part 19 on the pressure sensor 18 will exceed the rated pressure. At this time, the driving part 4 22 will enter the power-on state, so when the positioning gear 24 contacts the rack 1 25, the rack 2 26 and the rack 3 27 When the handle 4 is released, the blocking effect of each rack on the positioning gear 24 will increase the detection pressure of the pressure sensor 18. When the set rated pressure is reached, the driving unit 22 is energized so that the positioning gear 24 can smoothly enter into a meshing state with each gear, and the friction plate installed on the output shaft of the driving unit 22 will also maintain the resistance when the positioning gear 24 is meshing with each rack, so that the driving unit 22 is in a continuously energized state. When the handle 4 is released, the pressure detected by the pressure sensor 18 drops below the rated pressure, the driving unit 22 is powered off and self-locked, and the positioning gear 24 in a meshing state with each rack will not be able to rotate. At this time, the friction tester is started to perform a friction test, and the position of the sample will be fixed, which will not affect the friction test process.

[0019] In order to enable the positioning gear 24 to smoothly engage with each rack, a guide rod 29 is fixedly installed on the front side of the gear bracket 23, and a guide block 28 is slidably connected to the main body 1. The guide block 28 is slidably connected to the guide rod 29, so that the axis of the positioning gear 24 is always perpendicular to each rack.

[0020] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A compatible friction testing machine, characterized in that: include: Subject (1); A PLC control system (11), the PLC control system (11) being installed in the main body (1), the PLC control system (11) being used to control various electrical components; A mounting frame (2), the mounting frame (2) being mounted on the main body (1), and the mounting frame (2) being used to mount a specimen; A loading rod (5), the loading rod (5) being arranged above the mounting frame (2); A loading component is mounted on the main body (1), the loading component comprises a loading bracket (6) mounted on the main body (1), a driving part (8) is fixedly mounted on the upper end of the loading bracket (6), and the driving part (8) is connected to the PLC control system (11) by signal; A reciprocating assembly is mounted on the main body (1), the reciprocating assembly comprises a second driving portion (10) fixedly mounted on the main body (1), the second driving portion (10) is signal-connected to the PLC control system (11), and a reciprocating rod (9) is slidably connected to the main body (1); A third drive unit (15), the third drive unit (15) is arranged below the mounting frame (2), the output shaft of the third drive unit (15) is coaxially fixed with the mounting frame (2), and the third drive unit (15) is connected to the PLC control system (11) for signal communication; A switching assembly is mounted on the main body (1), comprising a slide plate (3) slidably connected to the main body (1), the slide plate (3) being fixedly connected to the driving portion (15), a lever (31) being connected to a bearing on one side of the slide plate (3), an elastic portion (30) being fixedly mounted between both sides of the lever (31) and the slide plate (3), a guide plate (14) being fixedly mounted on the main body (1), a rotary slot being provided on the inner side of the guide plate (14), a slide bar (37) being mounted on one end of the lever (31) away from the slide plate (3), the slide bar (37) being adapted to slide in the rotary slot.

2. A compatible friction testing machine according to claim 1, characterized in that: The inner side of the loading bracket (6) is slidably connected to a loading slider (7), the loading slider (7) is threadedly connected to the output end of the driving part (8), the lower end of the loading slider (7) is in contact with the upper end of the loading rod (5), and the loading slider (7) is suitable for sliding up and down in the vertical direction when the output end of the driving part (8) moves forward and reverse.

3. A compatible friction testing machine according to claim 2, characterized in that: A disc (12) is fixedly mounted on the output end of the second driving part (10), a connecting rod (13) is connected to a bearing on one side of the disc (12), one end of the reciprocating rod (9) is connected to the bearing of the connecting rod (13), and the reciprocating rod (9) is suitable for sliding back and forth through the connecting rod (13) when the disc (12) rotates, and one end of the reciprocating rod (9) away from the connecting rod (13) is slidably connected to the loading rod (5).

4. A compatible friction testing machine according to claim 3, characterized in that: The rotary slide is provided with a slideway 1 (32), a slideway 2 (33) and a slideway 3 (34), the lower end bearing of the slide bar (37) is connected to a gear bracket (23), the upper bearing of the gear bracket (23) is connected to a positioning gear (24), a drive unit 4 (22) is fixedly mounted on the gear bracket (23), the drive unit 4 (22) is connected to the PLC control system (11) signal, the output end of the drive unit 4 (22) is coaxially fixed with the positioning gear (24), an encoder is mounted on the drive unit 4 (22), the encoder is connected to the PLC control system (11) signal, and a rack 1 (25), a rack 2 (26) and a rack 3 (27) are fixedly mounted on the main body (1). 7), the positioning gear (24) is adapted to be meshed with the rack 1 (25) when the slide bar (37) slides to the slideway 1 (32), the positioning gear (24) is adapted to be meshed with the rack 2 (26) when the slide bar (37) slides to the slideway 2 (33), the positioning gear (24) is adapted to be meshed with the rack 3 (27) when the slide bar (37) slides to the slideway 3 (34), a sensor 1 (35) is installed in the slideway 2 (33), a sensor 2 (36) is installed at the exit of the rotary chute, a stopper (21) is fixedly installed on the main body (1), and an elastic part 2 (20) is fixedly installed on the side of the slide plate (3) close to the stopper (21); Wherein: the second driving part (10) is suitable for entering the standby state when the first sensor (35) detects the slide bar (37), and the second driving part (10) is suitable for exiting the standby state when the second sensor (36) detects the slide bar (37).

5. A compatible friction testing machine according to claim 4, characterized in that: A sliding chamber (16) is provided inside the side of the slide plate (3) away from the shifting rod (31), a piston (17) is slidably connected inside the sliding chamber (16), elastic parts (19) are provided on both sides of the piston (17), a pressure sensor (18) is installed on the piston (17), the pressure sensor (18) is connected to the PLC control system (11) for signal transmission, and the pressure sensor (18) is used to detect the pressure of the elastic part (19), and a handle (4) is fixedly connected to the end of the piston (17) away from the slide plate (3).

6. A compatible friction testing machine according to claim 5, characterized in that: The drive unit four (22) has a power-off self-locking function, and a friction plate is installed on the output shaft of the drive unit four (22). The friction plate is used to increase the resistance to manual rotation of the output shaft of the drive unit four (22).

7. A compatible friction testing machine according to claim 6, characterized in that: A guide rod (29) is fixedly mounted on one side of the gear bracket (23), a guide block (28) is slidably connected to the main body (1), and the guide block (28) is slidably connected to the guide rod (29).

8. The compatible friction testing machine according to claim 4, characterized in that: The slide rod (37) is a cylindrical structure and is made of a wear-resistant material.

9. The compatible friction testing machine according to claim 2, characterized in that: A guide rail slider is provided between the loading slider (7) and the loading rod (5).

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