Coaxial friction and wear device

Abstract

The present application provides a coaxial friction and wear device. The coaxial friction and wear device comprises: a pressure vessel, which comprises an end cover, a cavity and a main shaft, the end cover is used to abut against the sealed cavity, a part of the main shaft extends into the cavity, and the other part of the main shaft passes through the end cover; a lower sample fixing device, which comprises a lower sample tray, the lower sample tray is fixed to the main shaft, and the lower sample tray is used to fix the lower sample; an upper sample fixing device, which comprises a guide plate and a positioning shaft, the guide plate is installed on the main shaft and the guide plate and the main shaft are relatively stationary along the axial direction of the main shaft, and the main shaft can rotate relative to the guide plate. The positioning shaft is connected to the guide plate through a ball spline bearing and a bearing positioning block, and the positioning shaft and the ball spline bearing are transitionally matched, and rolling friction can be achieved. The positioning shaft and the guide plate can move relative to each other in the axial direction, and the positioning shaft is used to fix the upper sample. After the lower sample fixing device and the upper sample fixing device are installed in the pressure vessel, the upper sample abuts against the lower sample.

Description

Technical Field

[0001] The present application relates to the field of material friction and wear, and in particular to a coaxial friction and wear device. Background Art

[0002] With the development of society and technology, the application fields of mechanical equipment are constantly expanding. Mechanical equipment in some special working environments are subject to high or low temperatures, pressure, corrosive media and atmosphere, etc. Compared with general environments, the friction and wear properties of materials in these environments usually show different laws, so it is necessary to conduct experimental research on the friction and wear properties of materials in these environments.

[0003] Friction and wear studies at high or low temperatures, under pressure, in corrosive media and in atmospheres are usually carried out in corrosion-resistant pressure vessels.

[0004] The Chinese patent application with application number CN201910198034.9 and publication number CN109883870A proposes a friction and wear tester in seawater environment, which can carry out friction and wear experiments in pressure and medium environment. Its pressure vessel has two end covers and a through cavity in the middle. The shaft of one end cover is used as the moving end. The outside world inputs the rotational motion through magnetic transmission. The shaft and one of the friction pairs are fixedly connected; the other end cover is used as the stationary end to fix the other friction pair and adopt magnetic loading. The device can simulate the seawater environment of a certain pressure and carry out pin-disc friction and wear experiments. However, there are certain problems with the magnetic loading method it adopts. The loading force is transmitted to the sample through the internal and external magnets, the shaft, etc. The transmission path is too long, the friction loss of the load is large, and the external loading force is difficult to represent the real load. This scheme requires two shafts responsible for loading and transmission, and requires a pressure vessel with a more complex structure. The processing and sealing are more difficult. At the same time, the product cost is increased. The upper and lower specimens are not coaxial, which is prone to coaxiality error and installation error.

[0005] Reference 1 proposes a friction and wear device that simulates a seawater environment. It adopts a one-end loading and one-end transmission method. The pressure vessel requires end covers on both sides and adopts an external contact loading method. The load loss is large and there is a leakage problem.

[0006] Reference 2 proposes a friction and wear device that simulates a seawater environment. It uses heavy objects for loading, has a limited load range and is difficult to adjust conveniently, and uses a double pin-disc friction pair, which is prone to friction surface deflection.

[0007] Reference 3 proposes a friction and wear device for simulating a high-pressure environment, which uses heavy objects for loading. The load range is limited and difficult to adjust conveniently, and it cannot be applied to medium environments such as seawater.

[0008] References:

[0009] [1] Chen Song. Research on tribological properties of materials in water environment[D]. China Academy of Mechanical Science, 2014.

[0010] [2]VERICHEV SN,MISHAKIN VV,NUZHDIN DA,et al.Experimental study ofabrasive wear of structural materials under the high hydrostatic pressure[J].Ocean Engineering,2015,99:9-13.

[0011] [3]RATIA VL,ZHANG D,CARRINGTON MJ,et al.The effect of temperature on sliding wear of self-mated HIPed Stellite 6in a simulated PWR waterenvironment[J].Wear,2019,420-421:215-225.

[0012] The friction and wear devices in current pressure vessels have the problems of long load transfer path and large friction loss; the upper and lower specimens are not coaxial, so the two ends need to be fixed separately, the structure is complex, and it is easy to produce inclination and coaxiality errors, and the load is uneven; the device is large in size and occupies a large space; it cannot be used in high and low temperature, pressure, medium and atmosphere environments, etc. Summary of the invention

[0013] In order to improve or solve at least one of the problems mentioned in the background technology, the present application provides a coaxial friction and wear device.

[0014] The coaxial friction and wear device provided in the present application is used to carry out friction and wear tests on upper and lower samples, and the coaxial friction and wear device comprises:

[0015] A pressure vessel, the pressure vessel comprising an end cover, a cavity and a main shaft, the end cover is used to abut and seal the cavity, a portion of the main shaft extends into the cavity, and another portion of the main shaft passes through the end cover;

[0016] A lower sample fixing device, the lower sample fixing device comprising a lower sample tray, the lower sample tray is fixed to the main shaft, and the lower sample tray is used to fix the lower sample;

[0017] The upper sample fixing device comprises a guide plate and a positioning shaft, wherein the guide plate is mounted on the main shaft and the guide plate and the main shaft are relatively stationary along the axial direction of the main shaft, the main shaft can rotate relative to the guide plate, the positioning shaft is connected to the guide plate and the positioning shaft and the guide plate can move relatively in the axial direction, and the positioning shaft is used to fix the upper sample,

[0018] After the lower sample fixing device and the upper sample fixing device are installed in the pressure container, the upper sample abuts against the lower sample.

[0019] In at least one embodiment, the spindle includes a first spindle and a second spindle connected axially, the first spindle abuts against the end cover, the second spindle has an external thread, and the lower sample tray and the guide plate are mounted on the second spindle.

[0020] In at least one embodiment, the coaxial friction and wear device comprises a guide disc fixing nut,

[0021] The lower sample fixing device comprises a lower sample fixing nut and a positioning sleeve.

[0022] The lower sample tray is arranged between the guide plate fixing nut and the lower sample fixing nut, and the lower sample tray is fixed to the main shaft through the guide plate fixing nut and the lower sample fixing nut.

[0023] The positioning sleeve is arranged between the guide plate fixing nut and the lower sample fixing nut, and the positioning sleeve abuts against the lower sample tray.

[0024] In at least one embodiment, the upper sample fixing device comprises a ball spline bearing, a bearing positioning block, a spring, an upper sample fixture and a spline shaft as the positioning shaft,

[0025] The ball spline bearing is transitionally fitted with the spline shaft, the spring is arranged between the ball spline bearing and the upper sample fixture, and the bearing positioning block is connected to the ball spline bearing and the guide plate.

[0026] In at least one embodiment, the ball spline bearing has an annular flange,

[0027] The bearing positioning block is in the shape of a hollow sleeve, and comprises a bearing positioning block central through hole for the spline shaft to pass through, a bearing positioning block top surface and a bearing positioning block bottom surface.

[0028] The top surface of the bearing positioning block abuts against the bottom surface of the annular flange of the ball spline bearing, and the bottom surface of the bearing positioning block abuts against the top surface of the guide plate. The top surface of the bearing positioning block and the bottom surface of the bearing positioning block are provided with an eccentric threaded hole of the bearing positioning block, and the corresponding positions of the annular flange of the ball spline bearing and the guide plate are provided with through holes.

[0029] The ball spline bearing, the bearing positioning block and the guide plate are fixed by inserting screws into the through holes at corresponding positions of the annular flange and the through holes at corresponding positions of the guide plate and screwing them into the eccentric threaded holes of the bearing positioning block.

[0030] In at least one embodiment, the upper sample fixing device includes a pair of thrust bearings, and the pair of thrust bearings are arranged on both axial sides of the guide plate.

[0031] In at least one embodiment, the main shaft has a step structure for positioning, and the thrust bearing located above the guide plate abuts against the step structure for positioning.

[0032] In at least one embodiment, the coaxial friction wear device includes a guide disk limiting device, and the guide disk limiting device includes a guide disk blocking rod, a fixed blocking rod and a fixer.

[0033] The holder is fixed to the inner wall of the cavity, the fixed blocking rod is fixed to the holder, the guide plate blocking rod is installed on the guide plate, and the guide plate blocking rod can contact the fixed blocking rod to limit the rotation of the guide plate.

[0034] In at least one embodiment, the fixed barrier rod comprises an abutment barrier rod and a support barrier rod.

[0035] The abutment stopper rod is connected to the support stopper rod in the axial direction, and the abutment stopper rod is located at the top of the support stopper rod.

[0036] The material of the abutting baffle rod is bearing steel, carbon steel, or martensitic stainless steel, and the material of the supporting baffle rod is stainless steel, titanium alloy, or Hastelloy.

[0037] The guide plate stopper includes a magnet, and the guide plate stopper can be attached to the contact stopper by magnetic force.

[0038] In at least one embodiment, the coaxial friction and wear device comprises an air inlet pipe, which passes through the end cover and extends into the cavity to provide a gas and / or liquid environment for the coaxial friction and wear device.

[0039] The upper and lower specimens in the present application are coaxially arranged with the main shaft, which simplifies the pressure vessel structure, improves the coaxiality error, and makes the experimental results more accurate. Transmission and loading are simultaneously achieved through the main shaft, with a short load transfer path, small friction loss, and a more uniform load. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of a coaxial friction and wear device according to an embodiment of the present application is shown.

[0041] Figure 2 Shows Figure 1 A partial enlarged view of .

[0042] Figure 3 A cross-sectional view of a bearing positioning block of a coaxial friction and wear device according to an embodiment of the present application is shown.

[0043] Figure 4 A top view of a bearing positioning block of a coaxial friction and wear device according to an embodiment of the present application is shown.

[0044] Description of Reference Numerals

[0045] 1 end cover; 2 cavity; 3 stopper for abutment; 4 spindle; 5 guide plate stopper; 6 ball spline bearing; 7 support stopper; 8 spline shaft; 9 spring pressure plate; 10 bearing positioning block; 11 guide plate; 12 thrust ball bearing; 13 bearing seat; 14 spring; 15 first fixture for upper sample; 16 positioning sleeve; 17 second fixture for upper sample; 18 upper sample; 19 lower sample; 20 lower sample tray; 21 lower sample fixing plate; 22 stopper fixing plate; 23 fixture; 24 guide plate fixing nut; 25 lower sample fixing nut; 26 step structure for abutting end cover; 27 fixing block; 28 intake pipe; 29 step structure for positioning; 30 central through hole of bearing positioning block; 31 eccentric threaded hole of bearing positioning block; 32 top surface of bearing positioning block; 33 bottom surface of bearing positioning block; 41 first spindle; 42 second spindle; A, AA section marks. DETAILED DESCRIPTION

[0046] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0047] The present application provides a coaxial friction and wear device. Figure 1 , 2 As shown, the present application can be used for, but not limited to, ball-disc friction and wear tests and pin-disc friction and wear tests. The spherical friction specimen can be the upper specimen 18 , and the disc friction specimen can be the lower specimen 20 .

[0048] The coaxial friction and wear device comprises a pressure container, a lower sample fixing device, an upper sample fixing device, and a guide plate limiting device.

[0049] Pressure Vessels

[0050] The pressure vessel may include an end cover 1 , a cavity 2 and a main shaft 4 .

[0051] The cavity 2 may have a cylindrical cavity inside, and the end cover 1 may abut against the cavity 2 to play a sealing role. The abutment between the end cover 1 and the cavity 2 may be a conical surface, which may further play a role in limiting the end cover 1 from continuing to move axially toward the cavity 2.

[0052] A portion of the main shaft 4 can extend into the cavity 2, and another portion of the main shaft 4 can pass through the end cover 1 and be exposed outside the top surface of the end cover 1. Further, the main shaft 4 includes an axially connected first main shaft 41 and a second main shaft 42. The first main shaft 41 may have a step structure 26 for abutting the end cover, and the step structure 26 for abutting the end cover can abut against the end cover 1, so that when an external device or an operator lifts the main shaft 4, the end cover 1 can be lifted at the same time. The first main shaft 41 may not have an external thread, so that the main shaft 4 can rotate relative to the end cover 1. The second main shaft 42 may have an external thread, and the lower sample fixture and the upper sample fixture (described later) can be fixed by the external thread of the second main shaft 42.

[0053] Lower specimen fixture

[0054] The lower sample fixing device may include a positioning sleeve 16, a lower sample tray 20, a lower sample pressing plate 21 and a lower sample fixing nut 25. The coaxial friction and wear device may include a guide plate fixing nut 24.

[0055] The guide plate fixing nut 24, the positioning sleeve 16, the lower sample tray 20, and the lower sample fixing nut 25 can be sequentially arranged on the second main shaft 42, and the guide plate fixing nut 24 can abut against the bearing seat 13 (which belongs to the upper sample fixing device and will be described later). The position of the guide plate fixing nut 24 is kept unchanged, and the lower sample tray 20 can be fixed on the main shaft 4 by tightening the lower sample fixing nut 25 in the direction of the guide plate fixing nut 24. The specific position of the lower sample tray 20 can be adjusted by using positioning sleeves 16 with different axial sizes.

[0056] The lower sample 19 and the lower sample pressing plate 21 can be arranged on the lower sample tray 20, and the lower sample pressing plate 21 is pressed on the lower sample 19. The lower sample 19 can be fixed to the lower sample tray 20 by tightening the lower sample pressing plate 21 with screws. By rotating the main shaft 4, the rotation of the lower sample 19 coaxial with the main shaft 4 can be achieved.

[0057] Upper sample fixture

[0058] The upper sample fixing device may include a ball spline bearing 6, a spline shaft 8 (an example of a positioning shaft), a spring pressure plate 9, a bearing positioning block 10, a guide plate 11, a thrust ball bearing 12 (an example of a thrust bearing), a bearing seat 13, a spring 14, an upper sample first clamp 15 and an upper sample second clamp 17 (the two constitute an example of an upper sample clamp).

[0059] The guide plate 11 can be mounted on the main shaft 4. A pair of thrust ball bearings 12 and a bearing seat 13 are mounted on both axial sides of the guide plate 11, so that the main shaft 4 can rotate relative to the guide plate 11. The main shaft 4 (second main shaft 42) also has a step structure 29 for positioning. The bearing seat 13 located above the guide plate 11 can abut against the step structure 29 for positioning, and the bearing seat 13 located below the guide plate 11 can abut against the guide plate fixing nut 24.

[0060] It can be understood that the thrust ball bearing 12 can also be replaced by other types of thrust bearings.

[0061] The spline shaft 8 (positioning shaft) can pass through the eccentric hole of the guide plate 11, and the ball spline bearing 6 can be transitionally fitted to the spline shaft 8. Further, the spline shaft 8 has a raceway (not shown in the figure), and the ball spline bearing 6 has balls (not shown in the figure) and a spline sleeve, and the balls are arranged in the raceway and abut against the raceway and the spline sleeve along the radial direction of the spline shaft 8.

[0062] The transition fit between the ball spline bearing 6 and the spline shaft 8 can be understood as follows: with the axis of the spline shaft 8 as the axis, the radial inside and radial outside of the radial contact point between the ball and the raceway are equivalent to a shaft-hole fit, and the shaft-hole fit is a transition fit. The radial inside and radial outside of the radial contact point between the ball and the spline sleeve are equivalent to a shaft-hole fit, and the shaft-hole fit is a transition fit.

[0063] The transition fit between the spline shaft 8 and the ball spline bearing 6 makes the spline shaft 8 and the ball spline bearing 6 abut more tightly, the radial swing of the spline shaft 8 is small, and the inclination error is small. When the spline shaft 8 of the present application moves in the axial direction, the friction mode between the ball spline bearing 6 and the spline shaft 8 is rolling friction, and the friction coefficient of rolling friction is small, so that the fluctuation of the load is small and the measurement result is more stable. The ball spline bearing 6 can limit the rotation of the spline shaft 8, and only rotates the lower sample 19 coaxial with the main shaft 4, and performs sliding friction between the upper sample 18 and the lower sample 19, the coaxiality is good, and the test measurement result is more stable.

[0064] A spring 14 may be provided below the ball spline bearing 6 , and the ball spline bearing 6 may be connected to the guide plate 11 through the bearing positioning block 10 , and then the spline shaft 8 may be connected to the guide plate 11 .

[0065] For the convenience of description, the present application introduces a cross-sectional view and cross-sectional marks A and AA of an embodiment of a bearing positioning block 10. The bearing positioning block 10 may be in the shape of a hollow sleeve, and the bearing positioning block 10 has a bearing positioning block central through hole 30 for the spline shaft 8 to pass through, a bearing positioning block top surface 32, and a bearing positioning block bottom surface 33. The bearing positioning block top surface 32 and the bearing positioning block bottom surface 33 have a bearing positioning block eccentric threaded hole 31.

[0066] The top surface 32 of the bearing positioning block abuts against the radial protrusion (annular flange) of the ball spline bearing 6, and the bottom surface 33 of the bearing positioning block abuts against the guide plate 11. The annular flange of the ball spline bearing 6 and the corresponding positions of the guide plate 11 have through holes, and the ball spline bearing 6, the bearing positioning block 10 and the guide plate 11 can be fixed by inserting screws into the through holes at the corresponding positions of the annular flange and the through holes at the corresponding positions of the guide plate 11 and screwing into the eccentric threaded hole 31 of the bearing positioning block.

[0067] Further, the top surface 32 of the bearing positioning block and the bottom surface 33 of the bearing positioning block may have a depression, and the depression of the top surface 32 of the bearing positioning block may cooperate with the spring pressure plate 9. The depression of the bottom surface 33 of the bearing positioning block may cooperate with the step hole at the corresponding position of the guide plate 11. The specific shape of the bearing positioning block 10 in the present application is not limited.

[0068] The lower end of the spline shaft 8 can be fixedly connected to the upper sample first fixture 15 and the upper sample second fixture 17. The upper sample first fixture 15 and the upper sample second fixture 17 can be fixedly connected to the upper sample 18. Further, a spring pressure plate 9 can be provided between the ball spline bearing 6 and the spring 14, and one end of the spring 14 is abutted by the spring pressure plate 9.

[0069] like Figure 2 As shown, the spring 14 can be a compression spring, in particular a helical compression spring. One end of the spring 14 can abut against the spring pressure plate 9, and the other end of the spring 14 can abut against the upper sample first clamp 15.

[0070] Boot disk limiter

[0071] The guide plate restricting device may include an abutment stopper bar 3 , a guide plate stopper bar 5 , a support stopper bar 7 , a stopper bar fixing plate 22 , a fixer 23 and a fixing block 27 .

[0072] The holder 23 can be fixed to the inner wall of the cavity 2. The abutment baffle rod 3 can be axially connected to the support baffle rod 7, and the support baffle rod 7 can be fixed to the fixing block 27. The abutment baffle rod 3 and the support baffle rod 7 can be fixed to the holder 23 by the fixing block 27, screws, and baffle rod fixing plate 22. It can be understood that here, the abutment baffle rod 3 and the support baffle rod 7 are used together as the fixed baffle rod in the present application, and the implementation mode in which the fixed baffle rod is composed of one fixed baffle rod or multiple fixed baffle rods is within the protection scope of the present application.

[0073] The second blocking rod 5 can be arranged on the guide plate 11 , and a magnet can be provided on the second blocking rod 5 . The second blocking rod 5 can contact with the abutting blocking rod 3 , so as to limit the rotation of the guide plate 11 .

[0074] According to the test requirements, there may be corrosive liquid inside the cavity 2, and the height of the corrosive liquid may be higher than the upper sample 18. The supporting baffle rod 7 located at the bottom can be made of corrosion-resistant material, including but not limited to stainless steel, titanium alloy, Hastelloy, etc., which has a good anti-corrosion effect. The abutment baffle rod 3 located at the top can be made of ferromagnetic material, including but not limited to bearing steel, carbon steel, martensitic stainless steel, etc. The abutment baffle rod 7 can fit with the magnet in the guide disk baffle rod 5. While the abutment baffle rod 3 contacts the guide disk baffle rod 5 to prevent the guide disk 11 from rotating, the vibration of the guide disk 11 can be reduced due to the magnetic adsorption effect. Compared with the design of a single baffle rod, the present application adopts a splicing design of the abutment baffle rod 3 and the guide disk baffle rod 7, which can improve the anti-corrosion effect of the baffle rod while achieving the effect of metal magnetic adsorption to make the main shaft 4 more stable.

[0075] The present application may further include an air inlet pipe 28, through which the gas and / or liquid atmosphere required for the test is provided into the chamber 2. A portion of the air inlet pipe 28 may be, but is not limited to, a channel formed in the end cover 1.

[0076] The load application step in this application may include:

[0077] The upper sample fixture is installed into the main shaft 4, and the lower sample fixture is installed into the main shaft 4, so that the lower sample 19 is in contact with the upper sample 18;

[0078] In the process of installing the lower sample fixing device into the main shaft 4 , the lower sample tray 20 drives the lower sample 19 to squeeze the upper sample 18 .

[0079] Keep the squeezed state of the lower sample 19 and the upper sample 18, that is, the compression amount of the spring 14 remains unchanged, and install the main shaft 4 into the cavity 2. It can be understood that the load amount is the product of the elastic coefficient of the spring 14 and the spring compression amount. The present application cannot change the load amount after the main shaft 4 is installed in the cavity 2.

[0080] The main shaft 4 rotates under external drive, driving the lower sample fixing device to rotate, and the upper sample fixing device remains stationary along with the guide plate 11, so that the motion friction between the upper sample 18 and the lower sample 19 can be achieved.

[0081] By replacing the bearing positioning block 10 and the positioning sleeve 16 with different axial lengths, the compression amount of the spring 14 can be changed, thereby achieving the purpose of changing the load amount. By changing the type of the spring 14 (elastic coefficient, etc.), the load amount can be changed when the spring compression amount is constant. Of course, the load amount can also be changed by changing the length of the spring (that is, using springs with different natural state lengths).

[0082] In the present application, the upper sample 18 is fixed on the main shaft 4 by the upper sample fixture, and the lower sample 20 is fixed on the main shaft 4 by the lower sample fixture, so as to achieve a coaxial experimental state. The upper and lower samples are concentrated on one main shaft, which simplifies the pressure vessel structure, improves the inclination and coaxiality errors, and makes the experimental results more accurate. The transmission and loading are realized simultaneously through the main shaft, the load transfer path is short, the friction loss is small, the load is more uniform, and the load loading amount is easy to adjust and calculate. The upper sample fixture and the lower sample fixture of the present application are small in size and occupy little space, and can be applied to high and low temperatures, various pressures, media and atmosphere environments.

[0083] The above is a preferred embodiment of the present application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A coaxial friction and wear device, characterized in that: The coaxial friction and wear device is used to carry out friction and wear tests on an upper sample (18) and a lower sample (19), and the coaxial friction and wear device comprises: A pressure vessel, the pressure vessel comprising an end cover (1), a cavity (2) and a main shaft (4), the end cover (1) being used to abut and seal the cavity (2), a portion of the main shaft (4) extending into the cavity (2), and another portion of the main shaft (4) passing through the end cover (1); A lower sample fixing device, the lower sample fixing device comprising a lower sample tray (20), the lower sample tray (20) being fixed to the main shaft (4), and the lower sample tray (20) being used to fix the lower sample (19); An upper sample fixing device, the upper sample fixing device comprising a guide plate (11) and a positioning shaft, the guide plate (11) being mounted on the main shaft (4) and the guide plate (11) and the main shaft (4) being relatively stationary along the axial direction of the main shaft (4), the main shaft (4) being rotatable relative to the guide plate (11), the positioning shaft being connected to the guide plate (11) and the positioning shaft and the guide plate (11) being relatively movable in the axial direction, the positioning shaft being used to fix the upper sample (18), After the lower sample fixing device and the upper sample fixing device are installed in the pressure vessel, the upper sample (18) abuts against the lower sample (19). The upper sample fixing device comprises a ball spline bearing (6), a bearing positioning block (10), a spring (14), an upper sample fixture and a spline shaft (8) serving as the positioning shaft, the ball spline bearing (6) being transitionally fitted to the spline shaft (8), the spring (14) being arranged between the ball spline bearing (6) and the upper sample fixture, the bearing positioning block (10) being connected to the ball spline bearing (6) and the guide plate (11), The upper sample fixing device comprises a pair of thrust bearings, which are arranged on both axial sides of the guide plate (11). The coaxial friction and wear device comprises a guide disk limiting device, wherein the guide disk limiting device comprises a guide disk blocking rod (5), a fixed blocking rod and a fixer (23), wherein the fixer (23) is fixed to the inner wall of the cavity (2), the fixed blocking rod is fixed to the fixer (23), the guide disk blocking rod (5) is installed on the guide disk (11), and the guide disk blocking rod (5) can contact the fixed blocking rod, thereby limiting the rotation of the guide disk (11).

2. The coaxial friction and wear device according to claim 1, characterized in that: The main shaft (4) comprises a first main shaft (41) and a second main shaft (42) which are axially connected, wherein the first main shaft (41) abuts against the end cover (1), the second main shaft (42) has an external thread, and the lower sample tray (20) and the guide plate (11) are mounted on the second main shaft (42).

3. The coaxial friction and wear device according to claim 1, characterized in that: The coaxial friction and wear device comprises a guide plate fixing nut (24), The lower sample fixing device comprises a lower sample fixing nut (25) and a positioning sleeve (16). The lower sample tray (20) is arranged between the guide plate fixing nut (24) and the lower sample fixing nut (25), and the lower sample tray (20) is fixed to the main shaft (4) through the guide plate fixing nut (24) and the lower sample fixing nut (25). The positioning sleeve (16) is arranged between the guide plate fixing nut (24) and the lower sample fixing nut (25), and the positioning sleeve (16) abuts against the lower sample tray (20).

4. The coaxial friction and wear device according to claim 1, characterized in that: The ball spline bearing (6) has an annular flange. The bearing positioning block (10) is in the shape of a hollow sleeve, and comprises a bearing positioning block central through hole (30) for the spline shaft (8) to pass through, a bearing positioning block top surface (32) and a bearing positioning block bottom surface (33). The top surface (32) of the bearing positioning block abuts against the bottom surface of the annular flange of the ball spline bearing (6), and the bottom surface (33) of the bearing positioning block abuts against the top surface of the guide plate (11). The top surface (32) of the bearing positioning block and the bottom surface (33) of the bearing positioning block are provided with an eccentric threaded hole (31), and the annular flange of the ball spline bearing (6) and the guide plate (11) are provided with through holes at corresponding positions. The ball spline bearing (6), the bearing positioning block (10) and the guide plate (11) are fixed by inserting screws into the through holes at corresponding positions of the annular flange and the through holes at corresponding positions of the guide plate (11) and screwing them into the eccentric threaded holes (31) of the bearing positioning block.

5. The coaxial friction and wear device according to claim 1, characterized in that: The main shaft (4) is provided with a step structure (29) for positioning, and the thrust bearing located above the guide plate (11) abuts against the step structure (29) for positioning.

6. The coaxial friction and wear device according to claim 1, characterized in that: The fixed blocking rod comprises a blocking rod for abutment (3) and a blocking rod for support (7). The abutment blocking rod (3) is connected to the support blocking rod (7) in the axial direction, and the abutment blocking rod (3) is located at the top of the support blocking rod (7). The material of the abutting baffle rod (3) is bearing steel, carbon steel, or martensitic stainless steel, and the material of the supporting baffle rod (7) is stainless steel, titanium alloy, or Hastelloy. The guide plate baffle rod (5) comprises a magnet, and the guide plate baffle rod (5) can be attached to the abutment baffle rod (3) by means of magnetic force.

7. The coaxial friction and wear device according to claim 1, characterized in that: The coaxial friction and wear device comprises an air inlet pipe (28), which passes through the end cover (1) and extends into the cavity (2), and is used to provide a gas and / or liquid environment for the coaxial friction and wear device.

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