A compatible friction testing machine

Abstract

The application discloses a compatible friction testing machine, which mainly comprises a main body, a PLC control system installed in the main body, a mounting rack, a loading rod arranged above the mounting rack, a loading assembly, a reciprocating assembly, a driving part three and a switching assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of friction and wear testing machines, in particular to a compatible friction testing machine. BACKGROUND

[0002] The friction testing machine is a testing device for simulating the friction and wear behavior of materials in high temperature environment, which is widely used in the fields of material science, mechanical engineering, petroleum and chemical industry, etc. The common friction testing machines include reciprocating friction testing machine and rotary friction testing machine, which respectively test the wear performance of samples through reciprocating sliding and rotation.

[0003] However, when users test the wear performance of different tests, they need friction testing machines with different friction modes. The existing friction testing machines have single function and cannot simultaneously satisfy the reciprocating sliding and rotary friction tests. Users need to purchase two kinds of friction testing machines to meet the test requirements, which causes waste of funds and occupies a large amount of space. Therefore, it is necessary to provide a compatible friction testing machine to solve the above problems.

[0004] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background technology of the present application concept, and therefore, it can contain information which does not constitute prior art. SUMMARY

[0005] The present application aims to provide a compatible friction testing machine to solve the problems raised in the background technology.

[0006] By adopting the above technical solution, the effect of compatible reciprocating sliding and rotary friction test is achieved.

[0007] The technical scheme adopted by the application to solve its technical problems is: a compatible friction testing machine, comprising a main body; a PLC control system installed in the main body, the PLC control system is used for controlling various electrical components; a mounting rack installed on the main body, the mounting rack is used for mounting a sample; a loading rod arranged above the mounting rack; a loading assembly installed on the main body, the loading assembly comprises a loading support installed on the main body, the upper end of the loading support is fixedly installed with a driving part one, the driving part one is signal connected with the PLC control system; a reciprocating assembly installed on the main body, the reciprocating assembly comprises a driving part two fixedly installed on the main body, the driving part two is signal connected with the PLC control system, and the main body is slidably connected with a reciprocating rod; a driving part three arranged below the mounting rack, the output shaft of the driving part three is coaxially fixed with the mounting rack, and the driving part three is signal connected with the PLC control system; a switching assembly installed on the main body, the switching assembly comprises a sliding plate slidably connected on the main body, the sliding plate is fixedly connected with the driving part three, one side bearing of the sliding plate is connected with a lever, and elastic parts three are fixedly installed between the two sides of the lever and the sliding plate, a guide plate is fixedly installed on the main body, a rotary sliding groove is formed in the inner side of the guide plate, a sliding rod is installed on the end of the lever away from the sliding plate, and the sliding rod is adapted to slide in the rotary sliding groove.

[0008] Further, the inner side of the loading support is slidably connected with a loading slider, the output end of the driving part one is threadedly connected with the loading slider, the lower end of the loading slider is abutted with the upper end of the loading rod, and the loading slider is adapted to slide vertically up and down when the output end of the driving part one reverses.

[0009] Further, the output end of the driving part two is fixedly installed with a disc, one side bearing of the disc is connected with a connecting rod, one end of the reciprocating rod is bearing connected with the connecting rod, the reciprocating rod is adapted to reciprocate through the connecting rod when the disc rotates, and the end of the reciprocating rod away from the connecting rod is slidably connected with the loading rod.

[0010] Further, the rotary chute is internally provided with a sliding channel one, a sliding channel two and a sliding channel three, the lower end bearing of the sliding rod is connected with a gear support, the gear support is connected with a positioning gear through a bearing, the gear support is fixedly installed with a driving part four, the driving part four is signal connected with the PLC control system, the output end of the driving part four is coaxially fixed with the positioning gear, the driving part four is installed with an encoder, the encoder is signal connected with the PLC control system, the main body is fixedly installed with a rack one, a rack two and a rack three, the positioning gear is adapted to engage with the rack one when the sliding rod slides to the sliding channel one, the positioning gear is adapted to engage with the rack two when the sliding rod slides to the sliding channel two, the positioning gear is adapted to engage with the rack three when the sliding rod slides to the sliding channel three, the sliding channel two is installed with a sensor one, the outlet of the rotary chute is installed with a sensor two, the main body is fixedly installed with a stop block, the side of the sliding plate close to the stop block is fixedly installed with an elastic part two.

[0011] Further, the driving part two is adapted to enter the standby running state when the sensor one detects the sliding rod, and the driving part two is adapted to exit the standby running state when the sensor two detects the sliding rod.

[0012] Further, the inside of the side of the sliding plate away from the pull rod is provided with a sliding cabin, the sliding cabin is slidably connected with a piston, the both sides of the piston are provided with an elastic part one, the piston is installed with a pressure sensor, the pressure sensor is signal connected with the PLC control system, the pressure sensor is used for detecting the pressure of the elastic part one, and the end of the piston away from the sliding plate is fixedly connected with a handle.

[0013] Further, the driving part four has a power-off self-locking function, the output shaft of the driving part four is installed with a friction plate, and the friction plate is used for increasing the resistance of manually rotating the output shaft of the driving part four.

[0014] Further, one side of the gear support is fixedly installed with a guide rod, the main body is slidably connected with a guide block, and the guide block is slidably connected with the guide rod.

[0015] Further, the sliding rod is in a cylindrical structure, and the sliding rod is made of wear-resistant material.

[0016] Further, a guide rail sliding block is arranged between the loading sliding block and the loading rod.

[0017] Compared with the prior art, the application has the beneficial effects that the compatible friction testing machine provided by the application can conveniently switch between reciprocating sliding, rotation, and reciprocating sliding and rotation composite friction test modes when adjusting the relative position of the test sample and the loading rod, thereby improving the compatibility of the friction testing machine and reducing the test cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall compatible friction testing machine;

[0019] Figure 2 It is a front view of the sectional view schematic diagram; Figure 1

[0020] Figure 3 It is an enlarged schematic diagram of the sectional view of the A area in the Figure 2

[0021] Figure 4 It is an enlarged schematic diagram of the B area in the Figure 2

[0022] Figure 5 It is a partial sectional view schematic diagram of the Figure 4

[0023] In the figure: 1, main body; 2, mounting frame; 3, sliding plate; 4, handle; 5, loading rod; 6, loading support; 7, loading sliding block; 8, driving part one; 9, reciprocating rod; 10, driving part two; 11, PLC control system; 12, disc; 13, connecting rod; 14, guide plate; 15, driving part three; 16, sliding cabin; 17, piston; 18, pressure sensor; 19, elastic part one; 20, elastic part two; 21, stop block; 22, driving part four; 23, gear support; 24, positioning gear; 25, rack one; 26, rack two; 27, rack three; 28, guide block; 29, guide rod; 30, elastic part three; 31, lever; 32, sliding way one; 33, sliding way two; 34, sliding way three; 35, sensor one; 36, sensor two; 37, sliding rod; 38, first rotation angle; 39, second rotation angle. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0025] ​​​​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.

[0026] 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;

[0027] like Figures 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;

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The driving part one 8 is a servo motor, the driving part one 8 is signal connected with the PLC control system 11, the inner side of the loading support 6 is slidingly connected with a loading sliding block 7, the loading sliding block 7 is directly below the driving part one 8, the upper end of the loading sliding block 7 is screw connected with the output end of the driving part one 8, the loading sliding block 7 is suitable for vertical up and down sliding when the output end of the driving part one 8 reverses motion;

[0033] The main body 1 is further provided with a reciprocating assembly, the reciprocating assembly comprises a driving part two 10 fixedly installed on the main body 1, the driving part two 10 is a servo motor, the driving part two 10 is signal connected with the PLC control system 11, the output end of the driving part two 10 is fixedly installed with a disc 12, the axis of the disc 12 is parallel to the horizontal plane, the front side of the disc 12 is fixedly installed with a small shaft, the small shaft is bearing connected with a connecting rod 13, the main body 1 is slidingly connected with a reciprocating rod 9, the reciprocating rod 9 can slide left and right above the main body 1, one end of the reciprocating rod 9 is bearing connected with the connecting rod 13;

[0034] When the driving part two 10 is powered on, the disc 12 rotates with the driving part two 10, the reciprocating rod 9 is suitable for reciprocating sliding through the connecting rod 13 when the disc 12 rotates, thereby providing the running state for the reciprocating friction test of the sample;

[0035] The other end of the reciprocating rod 9 away from the connecting rod 13 is slidingly connected with a loading rod 5, the loading rod 5 is used for wear detection of the sample, the loading rod 5 is above the mounting frame 2, the lower end of the loading rod 5 is abutted with the test, the upper end of the loading rod 5 is abutted with the lower end of the loading sliding block 7;

[0036] When the driving part one 8 is controlled to start, the loading sliding block 7 is made to slide downward through the screw connection, the loading sliding block 7 will gradually increase the load pressure on the sample fixed on the mounting frame 2 through the loading rod 5, thereby providing the load required by the sample friction test;

[0037] When the driving part two 10 is controlled to start, the disc 12 drives the reciprocating rod 9 to slide left and right through the connecting rod 13, the loading rod 5 slidingly connected with the reciprocating rod 9 also slides left and right with the reciprocating rod 9, thereby realizing the effect of reciprocating friction test on the sample;

[0038] When the driving part two 10 is not started, the position of the reciprocating rod 9 is fixed, the contact position of the lower end of the loading rod 5 with the test is adjusted by adjusting the left and right positions of the sliding plate 3, when the driving part three 15 is started, the sample rotates with the mounting frame 2, thereby realizing the effect of rotating friction test on the sample;

[0039] In order to reduce the wear and tear of the upper end of the loading rod 5 in contact with the loading slider 7 when the reciprocating friction test is carried out, a guide rail slider is installed between the loading slider 7 and the loading rod 5. The guide rail 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, so that when the loading slider 7 increases the load on the loading rod 5, the connection of the guide rail slider makes the upper end of the loading rod 5 not cause serious wear and tear when it reciprocates, thereby improving the service life;

[0040] As shown in Figure 2 、 Figures 4-5 In order to conveniently switch the test mode of the sample, a switching assembly is installed on the main body 1. The switching assembly includes a guide plate 14 fixedly installed on the main body 1, a rotary sliding groove is formed in the inner side of the lower end of the guide plate 14, a lever 31 is connected to the left bearing of the sliding plate 3, the lever 31 can rotate horizontally around the connection with the sliding plate 3, and elastic portions three 30 are fixedly installed between the two sides of the lever 31 and the sliding plate 3. The position of the lever 31 can be limited by the elastic portions three 30 on both sides of the lever 31. In the case that it is not subjected to external force, the length direction of the lever 31 is parallel to the sliding direction of the sliding plate 3, and this position is the static position of the lever 31.

[0041] The end of the lever 31 away from the sliding plate 3 is fixedly installed with a sliding rod 37, and the sliding rod 37 is suitable for sliding in the rotary sliding groove. An inlet and an outlet are arranged on the side of the rotary sliding groove close to the sliding plate 3. When the lever 31 slides with the sliding plate 3 towards the guide plate 14, the lever 31 will not rotate randomly under the limitation of the elastic portions three 30, and the sliding rod 37 will first enter the inlet of the rotary sliding groove and can exit from the outlet along the rotary sliding groove.

[0042] A slide one 32, a slide two 33 and a slide three 34 are arranged in the rotary sliding groove. The sliding rod 37 entering from the inlet of the rotary sliding groove will pass through the slide one 32, the slide two 33 and the slide three 34 in turn, and the slide one 32, the slide two 33 and the slide three 34 are all on the same side of the static position of the lever 31.

[0043] A stop block 21 is fixedly installed on the upper end of the main body 1, and an elastic portion two 20 is fixedly installed on the side of the sliding plate 3 close to the stop block 21. When the sliding plate 3 slides towards the guide plate 14 and the sliding rod 37 moves to the inlet of the rotary sliding groove, the elastic portion two 20 will abut against the stop block 21. When the sliding plate 3 continues to slide towards the guide plate 14, the elastic portion two 20 will give the sliding plate 3 an elastic force in the opposite direction.

[0044] As shown in Figure 5As 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;

[0045] 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;

[0046] 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.

[0047] 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.

[0048] 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 .

[0049] When the sliding rod 37 slides to the slide one 32, the driving part four 22 is in the unpowered state at this time, the positioning gear 24 cannot rotate, so that the positioning gear 24 is blocked by the rack one 25, at this time, the driving part four 22 is powered, the positioning gear 24 can rotate, the sliding plate 3 can continue to move to the direction of the guide plate 14, and at this time, the encoder runs to record the number of rotations of the driving part four 22, and the position of the sliding plate 3, that is, the contact position of the sample and the loading rod 5 can be confirmed, when the encoder runs, the friction tester is set to the rotating friction test state through the PLC control system 11, the driving part three 15 enters the standby running state, the standby running state means that the driving part three 15 is in the zero torque powered state, and can immediately respond to the start instruction, when the machine starts, the driving part three 15 will be controlled to start, so that the mounting frame 2 drives the sample to rotate to perform the rotating friction test, when the encoder records the rotating path and distance of the positioning gear 24, and the rack one 25 is separated, the driving part three 15 will exit the standby running state, similarly, when the sliding rod 37 slides to the slide three 34, the positioning gear 24 engages with the rack three 27, the rotating friction test state of the friction tester is also started;

[0050] The sensor one 35 is installed in the slide two 33, and the sensor two 36 is installed at the outlet of the rotary sliding groove, the sensor one 35 and the sensor two 36 are signal connected with the PLC control system 11, and the sensor one 35 and the sensor two 36 are both proximity photoelectric sensors, which will send a signal to the PLC control system 11 when detecting the sliding rod 37, when the sliding rod 37 slides to the slide two 33, the positioning gear 24 will be blocked by the rack two 26, at this time, the driving part four 22 is powered, the positioning gear 24 can rotate and enter the meshing state with the rack two 26, the sliding rod 37 is smoothly slid to the side close to the stop block 21 of the slide two 33 under the elastic force of the elastic part two 20, at this time, the sensor one 35 will detect the sliding rod 37, so as to control the driving part two 10 to enter the standby running state through the PLC control system 11, the standby running state means that the driving part two 10 is in the zero torque powered state, and can immediately respond to the start instruction, starting the friction tester will drive the loading rod 5 to slide back and forth through the reciprocating rod 9, so as to perform the reciprocating friction test, when the sliding rod 37 slides out of the outlet of the rotary sliding groove, the sensor two 36 will detect the sliding rod 37, so as to control the driving part two 10 to exit the standby running state through the PLC control system 11;

[0051] When the sliding rod 37 slides to the slide three 34, the positioning gear 24 and the rack three 27 enter the meshing state, the driving part three 15 enters the standby running state, and at this time, the driving part two 10 is still in the standby running state, so that the special sample can be subjected to the composite friction test of reciprocating and rotating in this state, and the applicability of the friction tester is improved;

[0052] As Figure 3As shown, in order to conveniently control the sliding of the sliding plate 3 and the start and stop of the driving part four 22, a sliding cabin 16 is arranged in the side of the sliding plate 3 away from the push rod 31, a piston 17 is slidably connected in the sliding cabin 16, elastic parts one 19 are arranged on both sides of the piston 17, the elastic parts one 19 are springs, a pressure sensor 18 is installed on the piston 17, the pressure sensor 18 is signal connected with the PLC control system 11, the pressure sensor 18 is used for detecting the pressure of the elastic parts one 19, and one end of the piston 17 away from the sliding plate 3 is fixedly connected with the handle 4.

[0053] The sliding of the sliding plate 3 can be conveniently controlled by holding the handle 4, the pressure sensor 18 can detect the resistance encountered by the sliding of the sliding 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 cabin 16, the elastic parts one 19 on the sliding direction of the piston 17 will be deformed, and the elastic parts one 19 on the side will generate pressure on the pressure sensor 18, when the sliding distance of the piston 17 exceeds the thickness of the piston 17, the pressure of the elastic parts one 19 on the pressure sensor 18 will exceed the rated pressure, at this time, the driving part four 22 will enter the energized state, therefore, when the positioning gear 24 is in contact with the gear one 25, the gear two 26 and the gear three 27, the blocking effect of each gear on the positioning gear 24 will increase the detection pressure of the pressure sensor 18, when the set rated pressure is reached, the driving part four 22 is energized to enable the positioning gear 24 to smoothly enter the meshing state with each gear, and the friction plate installed on the output shaft of the driving part four 22 also maintains the resistance when the positioning gear 24 is meshed with each gear, so that the driving part four 22 is in a continuous energized state, and when the handle 4 is released, the pressure detected by the pressure sensor 18 decreases below the rated pressure, the driving part four 22 is de-energized and self-locked, and the positioning gear 24 in the meshing state with each gear cannot rotate, at this time, the friction tester is started to perform the friction test, and the position of the sample is fixed, which does not affect the friction test process.

[0054] In order to enable the positioning gear 24 to smoothly enter the meshing state with each gear, a guide rod 29 is fixedly installed on the front side of the gear bracket 23, a guide block 28 is slidably connected on the main body 1, the guide block 28 is slidably connected with the guide rod 29, so that the axis of the positioning gear 24 is always perpendicular to each gear.

[0055] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A compatible friction testing machine, characterized in that: include: Subject (1); A PLC control system (11), which is installed in the main body (1), and is 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 sample; 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 comprising a loading bracket (6) mounted on the main body (1), a driving unit (8) being fixedly mounted on the upper end of the loading bracket (6), and the driving unit (8) being connected to the PLC control system (11) for signal communication; A reciprocating assembly is mounted on the main body (1), the reciprocating assembly comprises a second driving part (10) fixedly mounted on the main body (1), the second driving part (10) is connected to the PLC control system (11) for signal communication, 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), the switching assembly comprises a slide plate (3) slidably connected to the main body (1), the slide plate (3) is fixedly connected to the driving part three (15), a bearing on one side of the slide plate (3) is connected to a shift lever (31), elastic parts three (30) are fixedly mounted between the two sides of the shift lever (31) and the slide plate (3), a guide plate (14) is fixedly mounted on the main body (1), a rotary slide groove is provided on the inner side of the guide plate (14), a slide rod (37) is mounted on the end of the shift lever (31) away from the slide plate (3), and the slide rod (37) is suitable for sliding in the rotary slide groove; The rotary chute is provided with a slideway 1 (32), a slideway 2 (33) and a slideway 3 (34), the lower end bearing of the slide rod (37) is connected to a gear bracket (23), the upper bearing of the gear bracket (23) is connected to a positioning gear (24), a driving unit 4 (22) is fixedly mounted on the gear bracket (23), the driving unit 4 (22) is connected to the PLC control system (11) signal, the output end of the driving unit 4 (22) is coaxially fixed with the positioning gear (24), and the main body (1) is fixedly mounted with a rack 1 (25) and a rack 2 (26). The positioning gear (24) is adapted to be meshed with the rack one (25) when the slide bar (37) slides to the slideway one (32), and the positioning gear (24) is adapted to be meshed with the rack two (26) when the slide bar (37) slides to the slideway two (33). The positioning gear (24) is adapted to be meshed with the rack three (27) when the slide bar (37) slides to the slideway three (34). A sensor one (35) is installed in the slideway two (33), and a sensor two (36) is installed at the exit of the rotary chute.

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), the reciprocating rod (9) is suitable for sliding back and forth through the connecting rod (13) when the disc (12) rotates, and the 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: An encoder is installed on the driving part (22), and the encoder is connected to the PLC control system (11) for signal connection. A stopper (21) is fixedly installed on the main body (1), and an elastic part (20) is fixedly installed on a side of the slide (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 in 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) by signal, 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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