Abrasion resistance testing machine

Abstract

The invention discloses a wear resistance testing machine, and belongs to the field of concrete performance testing devices. The wear resistance testing machine comprises a grinding head assembly for grinding a sample, a supporting assembly for supporting the sample, a rotating assembly movably connected with the grinding head assembly, a first driving assembly for driving the rotating assembly to rotate, a fixing assembly rotationally connected with the rotating assembly to limit the rotating assembly and used for fixedly mounting the supporting assembly, and a control unit. The fixing assembly comprises a first fixing plate and a first bearing sleeve, a first bearing is embedded in the first bearing sleeve, the rotating assembly is slidably connected with an inner ring of the first bearing, and at least three positioning supporting columns are arranged on the lower surface of the first fixing plate; the device further comprises a second fixing plate and a driven wheel supporting seat, a second bearing is arranged in an inner cavity of the driven wheel supporting seat, and the rotating shaft penetrates through the first bearing and the second bearing. The wear resistance testing machine enables the size of the annular grinding groove of the prepared sample to be uniform, and guarantees smooth proceeding of the test.

Description

Technical Field

[0001] This invention relates to the field of concrete performance testing devices, and in particular to an abrasion resistance testing machine. Background Technology

[0002] Concrete and its products are widely used in the construction industry, including foundations, bridges and tunnels, and building construction. To ensure the durability and stability of concrete products during use, abrasion resistance testing is an essential step. By conducting abrasion resistance tests, concrete products that meet safety standards are selected.

[0003] The existing method for evaluating wear resistance is the ball bearing method. Its principle is to use a ball bearing as the grinding head, which, when rotating under a specified load, generates rolling and sliding friction on the surface of the sample. An annular groove is ground into the surface. The wear resistance is calculated by measuring the depth of the groove and the number of grinding revolutions of the grinding head.

[0004] However, in actual use, due to factors such as the unevenness of the bottom surface of the sample relative to the grinding surface and the non-parallelism between the support platform and the grinding surface, the size of the annular grinding groove is uneven, as shown in the attached diagram of the instruction manual. Figure 1 and Figure 2 As shown in the figure, section 7.11.1.4 of JC / T 906-2023 "Cement-based Wear-resistant Materials for Concrete Floors" states: "Using the maximum width of the groove in sample 100 as the reference point, measure the groove width at 90 degrees and 180 degrees of rotation from the reference point of sample 100, accurate to 0.1 mm. The ratio of the maximum groove width to the minimum groove width should not exceed 1.5; otherwise, sample 100 should be discarded." Such a test would waste test materials, affect test efficiency, and increase the workload of the test personnel. Summary of the Invention

[0005] This invention provides an abrasion resistance testing machine to solve the problem of uneven size of the annular grinding groove after the sample is worn, thereby improving the testing efficiency.

[0006] The technical solution of the present invention is as follows:

[0007] Abrasion testing machine, used for grinding specimens and forming annular grinding grooves on the specimens, includes:

[0008] A grinding head assembly is placed on the grinding surface of a sample to grind the sample; it includes an annular support seat and multiple balls that are rolledly connected to the annular support seat, with the top and bottom walls of the balls protruding from the annular support seat respectively.

[0009] A rotating assembly is movably connected to the grinding head assembly and is used to drive the grinding head assembly to grind the sample. The rotating assembly includes a rotating shaft and an annular plate fixed to the bottom end of the rotating shaft. An annular slide is provided on the bottom surface of the annular plate along the circumferential direction to cooperate with the grinding head assembly.

[0010] The first drive assembly, connected to the rotating assembly, is used to drive the rotating assembly to rotate; it includes a rotation source, a drive wheel connected to the drive end of the rotation source, a driven wheel connected to the rotating assembly, a belt sleeved on the drive wheel and the driven wheel, and a first coupling between the rotating assembly and the driven wheel;

[0011] The rotating component rotates with the first coupling and moves up and down relative to the first coupling;

[0012] A fixed assembly, rotatably connected to a rotating assembly to limit the rotation of the rotating assembly, includes a first fixed plate perpendicular to the axis of rotation and a first bearing sleeve fixedly mounted on the first fixed plate. A first bearing is embedded in the first bearing sleeve. The first fixed plate has a first through hole. The rotating assembly is slidably connected to the inner ring of the first bearing. At least three positioning support columns parallel to the axis of rotation are provided on the lower surface of the first fixed plate on the outer side of the rotating shaft. The bottom ends of the multiple positioning support columns are coplanar. The assembly also includes a second fixed plate perpendicular to the axis of rotation and a cylindrical driven wheel support fixedly mounted on the second fixed plate. The driven wheel is mounted on the upper surface of the driven wheel support. A second bearing is provided in the inner cavity of the driven wheel support. The outer ring of the second bearing is fitted and fixed to the driven wheel support. The inner ring of the second bearing is sleeved on a first coupling and rotates synchronously with the first coupling.

[0013] A support assembly for supporting the specimen and enabling the specimen to move up and down; including a specimen placement stage, a second drive assembly connected to the specimen placement stage, and a universal joint between the specimen placement stage and the second drive assembly.

[0014] The control unit is electrically connected to the support assembly and the first drive assembly, respectively, and is used to control the support assembly and the first drive assembly to perform actions.

[0015] When the second drive assembly moves the sample up to contact the positioning support column, the grinding surface of the sample comes into contact with the bottom plane of the positioning support column, the sample is automatically positioned parallel to the grinding head assembly, the sample is clamped between the positioning support column and the sample placement stage, the top wall of the ball comes into contact with the annular slide, and the bottom wall of the ball comes into contact with the grinding surface of the sample.

[0016] According to the aforementioned abrasion resistance testing machine, it also includes a water supply component disposed at the bottom of the rotating assembly. The water supply component includes a water inlet column fixedly disposed at the bottom of the rotating shaft, a water inlet sleeve sleeved on the water inlet column, and a connecting plate fixedly disposed on the bottom end face of the water inlet column. The inner diameter of the water inlet sleeve is smaller than the diameter of the rotating shaft. The upper end face of the water inlet sleeve is connected to the bottom end face of the rotating shaft. The water inlet sleeve is confined between the rotating shaft and the connecting plate. The water inlet column has a water inlet channel communicating with the inner cavity of the water inlet sleeve. A radially penetrating connecting hole is provided on the circumferential surface of the water inlet sleeve. A water inlet connector is provided on the penetrating connecting hole. The water inlet connector is connected to the water inlet device.

[0017] A first water outlet hole is provided at the central axis of the connecting plate, and the water inlet channel is connected to the first water outlet hole.

[0018] Furthermore, the connecting plate is a stepped first connecting plate and a second connecting plate, with a transition surface between the first connecting plate and the second connecting plate. A circular groove is opened in the center of the top surface of the first connecting plate, and the bottom end of the water inlet column is embedded in the circular groove. The top surface of the first connecting plate is connected to the bottom surface of the water inlet sleeve.

[0019] The second connecting plate is embedded in the inner cavity of the annular plate, and the transition surface is in contact with the top surface of the annular plate.

[0020] The rotating assembly also includes a mounting plate, an annular plate disposed between the mounting plate and the first connecting plate, and the annular plate is spaced apart from the water inlet sleeve.

[0021] Furthermore, the water supply component also includes a limiting structure, which restricts the rotation of the inlet sleeve while enabling the inlet sleeve to rise and fall.

[0022] Furthermore, the limiting structure includes a limiting post located outside the central axis on the upper end face of the water inlet sleeve and a baffle plate slidably connected to the limiting post. One end of the baffle plate has a through hole, the limiting post is clearance-fitted with the through hole and passes through the through hole of the baffle plate, and the other end of the baffle plate is fixed to the fixing component.

[0023] According to the aforementioned abrasion testing machine, it also includes a load assembly sleeved on the rotating assembly for providing load to the grinding head assembly;

[0024] The load assembly includes a load cylinder. An upper groove and a lower groove are respectively provided at the central axis positions of the upper and lower ends of the load cylinder. A third bearing is provided in the upper groove and a fourth bearing is provided in the lower groove. The rotating assembly is rotatably connected to the third bearing and the fourth bearing respectively. Two spaced slots are provided in the middle of the rotating shaft along the circumferential direction. A clamp is provided in each slot. One clamp is provided on the upper surface of the third bearing and the other clamp is provided on the lower surface of the fourth bearing. The clamps fix the load assembly in the axial direction of the rotating shaft.

[0025] Furthermore, it also includes a detection component; the detection component includes a crossbar and a displacement sensor, one end of the crossbar is set on the circumferential surface of the load cylinder, the crossbar is perpendicular to the central axis of the load cylinder, and the displacement sensor is used to detect the displacement of the crossbar; the detection component also includes a limiting plate, the limiting plate is fixedly set on the end of the first fixed plate and the second fixed plate away from the vertical fixed plate, the limiting plate has an elongated limiting hole along the axial direction parallel to the rotating shaft, and the crossbar passes through the limiting hole;

[0026] The detection assembly also includes a rotation speed detection sensor and a detection column fixedly mounted on one side of the annular support. The rotation speed detection sensor is located at the same height on the outer side of the annular support; the rotation speed detection sensor is fixedly mounted on the fixing assembly.

[0027] According to the aforementioned wear resistance testing machine, a groove is provided on one of the side wall of the rotating shaft and the inner side wall of the first coupling, and a positioning protrusion that can cooperate with the groove is provided on the other side wall of the rotating shaft and the inner side wall of the first coupling. The positioning protrusion is slidably arranged relative to the groove.

[0028] According to the aforementioned abrasion testing machine, the fixing assembly also includes a third fixing plate above the rotation source and a cylindrical drive wheel support fixedly mounted on the third fixing plate. The drive wheel is mounted on the upper surface of the drive wheel support. The third fixing plate has a third through hole. The second coupling connected to the drive end of the rotation source passes through the third through hole and is connected to the drive wheel.

[0029] The fixing assembly also includes a worktable and a vertical fixing plate located on the upper surface of the worktable and perpendicular to the worktable. The first fixing plate and the second fixing plate are located on the same side of the vertical fixing plate and are arranged parallel to each other at intervals. The second fixing plate is located above the first fixing plate. The second fixing plate is located on one side of the top of the vertical fixing plate, and the third fixing plate is located on the other side of the top of the vertical fixing plate. The second fixing plate and the third fixing plate are at the same height.

[0030] The vertical fixing plates are fixedly connected to the workbench, the first fixing plate, the second fixing plate, and the third fixing plate, respectively.

[0031] Furthermore, it also includes protective components arranged around the top of the workbench; the protective components include side walls and doors movably connected to the side walls.

[0032] The present invention has the following beneficial effects:

[0033] (1) The first drive assembly operates and provides rotational power to the rotating assembly through the belt; the first bearing and the second bearing limit the rotation of the rotating assembly during the rotation process, avoiding the pressure perpendicular to the central axis of the rotating assembly brought by the power transmission to the rotating assembly, ensuring that the rotating assembly applies the rotational force evenly to the grinding head assembly, so that the grinding head assembly grinds the sample evenly; the universal joint in the support assembly enables the sample to automatically lock into a position parallel to the grinding head assembly. The two work together to ensure that the annular grinding groove size of the sample obtained by the wear resistance test mechanism is uniform, and there is no problem of one side of the grinding groove being deep and the other side being shallow, ensuring the smooth progress of the test;

[0034] (2) The water supply component of the present invention is set at the bottom of the rotating shaft and adopts an internal water supply rotary joint device to prevent water from flowing out of the rotating shaft and causing the rotating shaft to rust, thus ensuring the stable rotation of the grinding head assembly;

[0035] (3) The present invention provides a load assembly on the rotating shaft, which can provide a uniform and stable load;

[0036] (4) The protective components can prevent water splashing generated by the water supply components when the grinding head assembly washes the sample during the grinding process from polluting the surrounding test environment. Attached Figure Description

[0037] Figure 1 A three-dimensional view of the defective sample;

[0038] Figure 2 A top view of the non-conforming sample;

[0039] Figure 3 A three-dimensional view of a qualified sample;

[0040] Figure 4 A top view of a qualified sample;

[0041] Figure 5 This is a perspective view of the main structure of the wear resistance testing machine of the present invention;

[0042] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0043] Figure 7 This is a front view of the main structure of the abrasion resistance testing machine of the present invention;

[0044] Figure 8 A 3D view of the fixed components;

[0045] Figure 9 A three-dimensional view showing the connection status of the second drive component and the universal joint supporting the component;

[0046] Figure 10A front view of the connection state of the rotating shaft, the first bearing sleeve, and the first bearing;

[0047] Figure 11 for Figure 10 Sectional view along the BB direction;

[0048] Figure 12 This is a schematic diagram showing the disassembled state of the first bearing sleeve and the first bearing;

[0049] Figure 13 A perspective view showing the connection state of the second fixed plate, driven wheel support, driven wheel, first coupling, and second bearing;

[0050] Figure 14 A top view showing the connection state of the second fixed plate, driven wheel support, driven wheel, first coupling, and second bearing;

[0051] Figure 15 for Figure 14 A cross-sectional view along the CC direction;

[0052] Figure 16 This is a front view showing the connection between the rotating component and the water supply component.

[0053] Figure 17 for Figure 16 Sectional view along the DD direction;

[0054] Figure 18 A three-dimensional view of the water inlet column;

[0055] Figure 19 This is a cross-sectional view of the water inlet column;

[0056] Figure 20 A three-dimensional view of the inlet sleeve;

[0057] Figure 21 This is a top view of the inlet sleeve;

[0058] Figure 22 for Figure 21 A sectional view along the EE direction;

[0059] Figure 23 Three-dimensional for the limiting plate Figure 1 ;

[0060] Figure 24 Three-dimensional for the limiting plate Figure 2 ;

[0061] Figure 25 A perspective view of a water supply assembly with limit posts and baffles;

[0062] Figure 26 This is a partial connection diagram of the rotating assembly, water supply assembly, grinding head assembly, and detection assembly;

[0063] Figure 27 This is a 3D view of the load assembly;

[0064] Figure 28 This is a front view of the load assembly;

[0065] Figure 29 for Figure 28 Sectional view along the FF direction;

[0066] Figure 30 A perspective view of an abrasion testing machine with protective components;

[0067] Figure 31 A 3D view of the displacement detection component in a state where it is not detecting the displacement of the crossbar;

[0068] Figure 32 A three-dimensional view of the displacement detection component in the state of detecting the displacement of the crossbar;

[0069] Figure 33 A 3D view of the displacement detection component;

[0070] Figure 34 This is a 3D view of the sensor bracket.

[0071] Explanation of reference numerals in the attached figures:

[0072] 100. Sample; 110. Annular grinding groove;

[0073] 1. Fixing assembly; 11. First fixing plate; 12. First bearing sleeve; 121. First bearing sleeve body; 122. Annular upper cover; 123. Annular lower cover; 124. Upper wear-resistant ring; 125. Lower wear-resistant ring; 126. Mounting ring plate; 13. Positioning support column; 14. Second fixing plate; 15. Driven wheel support seat; 16. Third fixing plate; 17. Driven wheel support seat; 18. Worktable; 19. Vertical fixing plate;

[0074] 2. Support assembly; 21. Sample placement stage; 22. Second drive assembly; 23. Universal joint; 24. Limiting cylinder;

[0075] 3. Rotating assembly; 31. Rotating shaft; 32. Annular plate; 33. Annular slide; 34. Mounting plate;

[0076] 4. First drive assembly; 41. Rotation source; 42. Drive wheel; 43. Driven wheel; 44. Belt; 45. First coupling;

[0077] 5. Grinding head assembly; 51. Annular support seat; 52. Ball bearings;

[0078] 6. Water supply assembly; 61. Water inlet column; 611. Annular groove; 612. Horizontal water inlet through hole; 613. Vertical water inlet through hole; 62. Water inlet sleeve; 621. Through connection hole; 622. First annular groove; 623. Second annular groove; 63. Connecting plate; 631. First water outlet; 632. First connecting plate; 633. Second connecting plate; 634. Transition surface; 635. Circular groove; 64. Water inlet connector; 65. Sealing ring; 66. Limiting post; 67. Baffle plate;

[0079] 7. Load assembly; 71. Load cylinder; 72. Third bearing; 73. Fourth bearing; 74. Clamp;

[0080] 8. Detection assembly; 81. Crossbar; 82. Displacement detection component; 821. Dial indicator body; 822. Finger rod; 823. Blocking block; 824. Lifting column; 83. Limiting plate; 831. Limiting hole; 84. Sensor bracket; 841. Fixing installation part; 842. Crossbar part; 843. Limiting groove; 844. Sliding groove; 85. Rotational speed detection sensor; 86. Detection column;

[0081] 9. Protective components; 91. Side wall; 92. Door. Detailed Implementation

[0082] To make the technical problem to be solved, the technical solution and advantages of the present invention clearer, the following description will be provided in conjunction with the accompanying drawings. Figures 3 to 34 The technical solution of the present invention will be clearly and completely described in conjunction with specific embodiments.

[0083] The wear resistance testing mechanism of this invention yields specimens with uniform annular grinding groove dimensions, eliminating the problem of one side having a deeper grinding groove and the other a shallower one. Figure 3 and Figure 4 As shown, this ensures the smooth progress of the experiment.

[0084] like Figures 5 to 8 As shown, the abrasion testing machine of this embodiment is used to grind the sample 100 and form an annular grinding groove 110 on the sample. The abrasion testing machine includes a fixing component 1, a support component 2, a rotating component 3, a first drive component 4, a grinding head component 5, and a control unit.

[0085] The rotating assembly 3 includes a rotating shaft 31 and an annular plate 32 fixed to the bottom end of the rotating shaft 31. An annular slide 33 that cooperates with the grinding head assembly 5 is provided on the bottom surface of the annular plate 32 along the circumferential direction.

[0086] The support assembly 2 is located below the rotating assembly 3, supporting the sample 100 and enabling it to move up and down. The rotating assembly 3 is movably connected to the grinding head assembly 5, driving the grinding head assembly 5 to grind the sample 100. The first drive assembly 4 is connected to the rotating assembly 3, driving it to rotate. The control unit is electrically connected to both the support assembly 2 and the first drive assembly 4, controlling them to perform corresponding actions. The fixing assembly 1 is used to fix the support assembly 2, and is also rotatably connected to the rotating assembly 3, limiting its movement.

[0087] The first drive assembly 4 is mounted on the fixed assembly 1. The fixed assembly 1 includes a first fixed plate 11 perpendicular to the axial direction of the rotating shaft 31 and a first bearing sleeve 12 fixedly mounted on the first fixed plate 11. The first fixed plate 11 has a first through hole, and the outer side of the first bearing sleeve 12 is fitted into the first through hole. A first bearing is embedded in the first bearing sleeve 12, and the outer ring of the first bearing is fitted and fixed to the first bearing sleeve 12. The rotating assembly 3 passes through the first through hole, aligns with the axis of the first bearing, and is slidably connected to the inner ring of the first bearing. Figure 10 and Figure 11 As shown. The lower surface of the first fixing plate 11 is provided with at least three positioning support columns 13 parallel to the axial direction of the rotating shaft 31 on the outer side of the rotating shaft 31, as shown. Figure 5 and Figure 6 As shown, the bottom ends of multiple positioning support columns 13 are coplanar, ensuring that the positioning support columns 13 are in contact with the wear surface of the sample 100. Specifically, the first fixing plate 11 has a threaded hole along the outer side of the first through hole, and the top end of the positioning support column 13 is threadedly connected to the threaded hole. Further, a first annular protrusion is fixedly provided on the outer side of the first bearing sleeve 12 along the circumferential direction. The first annular protrusion is fixed to the first fixing plate 11 by screws. The outer diameter of the first bearing sleeve 12 is equal to the diameter of the first through hole. The first bearing sleeve 12 is fitted into the first through hole, realizing the fixed connection between the first fixing plate 11 and the first bearing sleeve 12, and the connection structure is stable.

[0088] Furthermore, such as Figure 11 and Figure 12As shown, the first bearing sleeve 12 includes a cylindrical first bearing sleeve body 121, an annular upper cover 122 located above the first bearing sleeve body 121, and an annular lower cover 123 located below the first bearing sleeve body 121. A first annular protrusion is fixedly connected to the first bearing sleeve body 121. The first bearing sleeve body 121 is fixedly connected to the annular upper cover 122 and the annular lower cover 123 by screws, respectively. The first bearing is disposed inside the first bearing sleeve body 121. To further stabilize the rotating shaft 31, the first bearing sleeve 12 also includes an upper wear-resistant ring 124 disposed below the annular upper cover 122 and a lower wear-resistant ring 125 disposed on the inner ring of the annular lower cover 123. The rotating shaft 31 is slidably connected to the upper wear-resistant ring 124 and the lower wear-resistant ring 125, respectively. The top of the first bearing sleeve body 121 is provided with a first annular groove. The annular upper cover 122 is connected to the first bearing sleeve body 121. The upper wear-resistant ring 124 is disposed in the first annular groove and is clamped between the annular upper cover 122 and the first bearing sleeve body 121. The inner ring of the annular lower cover 123 is provided with a second annular groove. The bottom of the annular lower cover 123 is fixedly connected to a mounting ring plate 126. The lower wear-resistant ring 125 is disposed in the second annular groove and is clamped between the annular lower cover 123 and the mounting ring plate 126.

[0089] like Figures 13 to 15 As shown, the fixing assembly 1 also includes a second fixing plate 14 perpendicular to the axial direction of the rotating shaft 31 and a cylindrical driven wheel support 15 fixedly mounted on the second fixing plate 14. The driven wheel 43 is disposed on the upper surface of the driven wheel support 15. A second bearing is disposed in the inner cavity of the driven wheel support 15. The second bearing includes a second bearing outer ring and a second bearing inner ring. The second bearing outer ring is fitted into the driven wheel support 15 for relative fixation, and the second bearing inner ring is sleeved on the first coupling 45, rotating synchronously with the first coupling 45. Further, the first coupling 45 is provided with a groove along the outer circumferential direction, and the second bearing is limited by a clamp provided on the groove. The second fixing plate 14 has a second through hole, through which the rotating assembly 3 passes. To enhance the supporting effect of the bearing on the rotating assembly 3, two overlapping second bearings are disposed in the inner cavity of the driven wheel support 15. A second annular protrusion is fixedly provided on the outer side of the driven wheel support 15 along the circumferential direction. The second annular protrusion is fixed to the second fixing plate 14 by screws. The outer diameter of the driven wheel support 15 is equal to the diameter of the second through hole. The outer side of the bottom end of the driven wheel support 15 is fitted into the second through hole, so as to realize the fixed connection between the second fixing plate 14 and the driven wheel support 15, and the connection structure is stable.

[0090] The first bearing is located at the upper end of the rotating shaft 31, and the second bearing is located at the lower end of the rotating shaft 31. The two bearings limit the bearing and ensure that the rotating shaft 31 does not deflect.

[0091] The fixing assembly 1 also includes a third fixing plate 16 above the rotation source 41 and a cylindrical drive wheel support 17 fixedly mounted on the third fixing plate 16. The drive wheel 42 is mounted on the upper surface of the drive wheel support 17. The third fixing plate 16 has a third through hole, through which a second coupling connected to the drive end of the rotation source 41 passes and is connected to the drive wheel 42. A third annular protrusion is fixedly mounted on the outer side of the drive wheel support 17 along the circumferential direction, and the third annular protrusion is fixed to the third fixing plate 16 by screws.

[0092] The fixing assembly 1 also includes a worktable 18 and a vertical fixing plate 19 located on the upper surface of the worktable 18 and perpendicular to the worktable 18. A first fixing plate 11 and a second fixing plate 14 are located on the same side of the vertical fixing plate 19 and are arranged parallel to each other at intervals. The second fixing plate 14 is located above the first fixing plate 11. The second fixing plate 14 is located on one side of the top of the vertical fixing plate 19, and a third fixing plate 16 is located on the other side of the top of the vertical fixing plate 19. The second fixing plate 14 and the third fixing plate 16 are at the same height, ensuring that the movement direction of the belt 44 is parallel to the planes of the second fixing plate 14 and the third fixing plate 16, respectively. The vertical fixing plate 19 is fixedly connected to the worktable 18, the first fixing plate 11, the second fixing plate 14, and the third fixing plate 16, respectively. The fixing connection method can be welding or threaded connection.

[0093] The support assembly 2 includes a sample placement stage 21 and a second drive assembly 22 connected to the sample placement stage 21. The second drive assembly 22 is used to drive the sample placement stage 21 to move up and down, thereby causing the sample 100 placed on the sample placement stage 21 to contact and separate from the positioning support column 13. The second drive assembly 22 is fixedly installed on the bottom surface of the worktable 18. The support assembly 2 also includes a universal joint 23 between the sample placement stage 21 and the second drive assembly 22, such as... Figure 9 As shown, the orientation of the sample placement stage 21 can be adjusted. A limiting cylinder 24 is provided at the bottom of the sample placement stage 21, and a universal joint 23 is disposed within the limiting cylinder 24. The limiting cylinder 24 restricts the movement range of the universal joint 23, preventing the sample 100 placed on the sample placement stage 21 from falling off due to excessive movement. The second drive assembly 22 includes, but is not limited to, linear drive components such as cylinders, hydraulic cylinders, and electric actuators.

[0094] When the sample 100 comes into contact with the positioning support column 13, the grinding surface of the sample 100 is in contact with the bottom plane of the positioning support column 13, and the sample 100 is automatically positioned parallel to the grinding head assembly 5, which effectively avoids uneven grinding of the sample 100 and improves the success rate of the test.

[0095] like Figure 5 and Figure 7As shown, the first drive assembly 4 includes a rotating source 41 fixed on the fixed assembly 1, a driving wheel 42 connected to the driving end of the rotating source 41, and a driven wheel 43 connected to the rotating assembly 3, as well as a belt 44 sleeved on the driving wheel 42 and the driven wheel 43. The first drive assembly 4 also includes a first coupling 45 between the rotating assembly 3 and the driven wheel 43. The first coupling 45 is connected to the driven wheel 43 via a connecting key, and the rotating assembly 3 can move up and down relative to the first coupling 45. A second coupling is provided between the driving end of the rotating source 41 and the driving wheel 42. The operation of the rotating source 41 drives the driving wheel 42 to rotate, which in turn drives the driven wheel 43 to rotate via the belt 44, which in turn drives the first coupling 45 to rotate, and the first coupling 45 drives the rotating assembly 3 to rotate. The rotating assembly 3 can move up and down relative to the first coupling 45. As the grinding head assembly 5 grinds the sample 100, the rotating assembly 3 can move downward with the grinding head assembly 5. The rotation source 41 can be any device capable of outputting rotation, such as a motor, engine, hydraulic motor, or a combination of one of these with a reducer. Preferably, the rotation source 41 is a small and technologically mature servo motor, the speed of which is adjustable, and a low-speed rotating grinding head assembly 5 can be used.

[0096] To enable the rotating assembly 3 to move vertically relative to the first coupling 45 while rotating, a groove is provided on one of the side wall of the rotating shaft 31 and the inner side wall of the first coupling 45, and a positioning protrusion that mates with the groove is provided on the other side wall of the rotating shaft 31 and the inner side wall of the first coupling 45. The positioning protrusion slides relative to the groove, thereby enabling the rotating assembly 3 to move vertically relative to the first coupling 45. In this embodiment, a groove is provided on the side wall of the rotating shaft 31, and a positioning protrusion is provided on the inner side wall of the first coupling 45. Alternatively, the rotating shaft 31 can also be a splined shaft, which, when mated with the second bearing, can also allow for longitudinal sliding on the shaft while rotating.

[0097] The first fixed plate 11 provides stable support for the first bearing sleeve 12, which in turn provides stable support for the first bearing, which in turn provides stable support for the rotating shaft 31. The second fixed plate 14 provides stable support for the driven wheel support seat 15, which in turn provides stable support for the second bearing, which in turn provides stable support for the first coupling 45, which in turn provides stable support for the rotating shaft 31. The component structure is stably connected, ensuring that the rotating shaft 31 does not shift.

[0098] The grinding head assembly 5 includes an annular support 51 and a plurality of balls 52 rollingly connected to the annular support 51, with the top and bottom walls of the balls 52 protruding from the annular support 51. When the abrasion testing machine grinds the specimen 100, the top wall of the balls 52 contacts the annular slide 33, and the bottom wall of the balls 52 contacts the abraded surface of the specimen 100. The annular support 51 has a fixing groove for accommodating the balls 52, and the plurality of balls 52 are rollingly connected within the fixing groove. The grinding head assembly 5 can be made of 13*15.875mm ball bearings, and the hardness of the balls 52 is greater than HRC62.

[0099] The first drive assembly 4 operates and provides rotational power to the rotating assembly 3 through the belt 44. The first bearing and the second bearing limit the rotation of the rotating assembly 3 during rotation to avoid the pressure perpendicular to the central axis of the rotating assembly 3 caused by the power transmission, and ensure that the rotating assembly 3 applies the rotational force evenly to the grinding head assembly 5, so that the grinding head assembly 5 grinds the sample 100 evenly.

[0100] When the second drive assembly 22 operates and drives the sample 100 to rise to contact with the positioning support column 13, the grinding surface of the sample 100 is in contact with the bottom plane of the positioning support column 13, the sample 100 is automatically positioned parallel to the grinding head assembly 5, the sample 100 is clamped between the positioning support column 13 and the sample placement platform 21, the top wall of the ball 52 is in contact with the annular slide 33, and the bottom wall of the ball 52 is in contact with the grinding surface of the sample 100.

[0101] The first and second bearings of the fixed component 1 limit the rotation of the rotating component 3, and the universal joint 23 in the support component 2 enables the sample 100 to automatically lock into a position parallel to the grinding head component 5. The two work together to ensure that the annular grinding groove of the sample obtained by the wear resistance test mechanism is uniform in size, and there is no problem of one side of the grinding groove being deep and the other side being shallow, thus ensuring the smooth progress of the test.

[0102] The abrasion testing machine can meet the abrasion resistance test requirements of specimens 100 of different sizes. Specifically, the dimensions of specimen 100 are: length 100-200mm, width 100-200mm, and thickness 5-50mm.

[0103] During the grinding process of the abrasion testing machine on the sample 100, the powder generated during grinding will affect the grinding process. It is necessary to remove the powder from the abrasion-exposed surface of the sample 100 in a timely manner. The abrasion testing machine also includes a water supply component 6 located at the bottom of the rotating assembly 3. For example... Figure 16 and Figure 17As shown, the water supply assembly 6 includes a water inlet column 61 fixedly mounted at the bottom end of the rotating shaft 31, a water inlet sleeve 62 sleeved on the water inlet column 61, and a connecting plate 63 fixedly mounted on the bottom end face of the water inlet column 61. The water inlet sleeve 62 is confined between the rotating shaft 31 and the connecting plate 63. The connecting plate 63 is used to limit the downward movement of the water inlet sleeve 62, preventing the water inlet sleeve 62 from detaching from the water inlet column 61, thereby ensuring that the water supply assembly 6 can work normally. The water inlet column 61 has a water inlet channel communicating with the inner cavity of the water inlet sleeve 62. A radially extending through connection hole 621 is provided on the circumferential surface of the water inlet sleeve 62. A water inlet connector 64 is provided on the through connection hole 621, and the water inlet connector 64 is connected to the water inlet device. Specifically, the inner diameter of the water inlet sleeve 62 is smaller than the diameter of the rotating shaft 31, and the upper end face of the water inlet sleeve 62 is in contact with the bottom end face of the rotating shaft 31. The structure of the water inlet sleeve 62 is as follows Figures 18 to 20 As shown, the inner cavity of the water inlet sleeve 62 has a first annular groove 622 and a second annular groove 623 spaced axially along the circumferential direction. Sealing rings 65 are respectively installed in the first annular groove 622 and the second annular groove 623 to prevent water from flowing out between the water inlet column 61 and the water inlet sleeve 62 when the water inlet column 61 rotates. A first through-hole 631 is provided at the central axis position of the connecting plate 63, and the water inlet channel communicates with the first through-hole 631. The connecting plate 63 is fixed to the bottom end face of the water inlet column 61 by screws.

[0104] The structure of the water inlet column is as follows Figure 18 and Figure 19 As shown. The specific structure of the water inlet channel of the water inlet column 61 is as follows: an annular groove 611 is provided in the middle of the water inlet column 61, and a radial horizontal water inlet hole 612 is provided inside the annular groove 611. The horizontal water inlet holes 612 are arranged in a circular array around the central axis of the water inlet column 61. An axial vertical water inlet hole 613 is provided inside the water inlet column 61. The top end of the vertical water inlet hole 613 intersects and communicates with the horizontal water inlet hole 612, and the bottom end of the vertical water inlet hole 613 communicates with the outside of the bottom end of the water inlet column 61. Water from the water inlet sleeve 62 is diverted in the annular groove 611, then flows into the horizontal water inlet hole 612, and then flows down into the vertical water inlet hole 613.

[0105] It should be noted that the water inlet device can be an external device or an internal device. When the water inlet device is an internal device, the water supply assembly 6 also includes a water tank and a delivery pump connected to the water tank and the water inlet connector 64.

[0106] like Figure 23 and Figure 24 As shown, the connecting plate 63 consists of a stepped first connecting plate 632 and a second connecting plate 633, with a transition surface 634 between the first connecting plate 632 and the second connecting plate 633. A circular groove 635 is formed at the center of the top surface of the first connecting plate 632. Figure 17As shown, the bottom end of the water inlet column 61 is embedded in the circular groove 635, and the top surface of the first connecting plate 632 is in contact with the bottom surface of the water inlet sleeve 62. The second connecting plate 633 is embedded in the inner cavity of the annular plate 32, and the transition surface 634 is in contact with the top surface of the annular plate 32, resulting in a stable connection structure. The rotating assembly 3 also includes a mounting plate 34, with the annular plate 32 positioned between the mounting plate 34 and the first connecting plate 632. Specifically, the mounting plate 34 is fixedly connected to the connecting plate 63 by screws. The annular plate 32 and the water inlet sleeve 62 are spaced apart to prevent friction between them when the annular plate 32 rotates relative to the water inlet sleeve 62.

[0107] The pressure load is transmitted from the rotating shaft 31 to the water inlet column 61, then to the connecting plate 63, then to the annular plate 32, and then to the grinding head assembly 5 via the annular plate 32. The component connection structure is stable, ensuring that the pressure load is stably applied to the grinding head assembly 5.

[0108] The wear resistance testing machine of this invention has a water inlet column and a water inlet sleeve at the bottom of the rotating shaft, and adopts an internal water supply rotary joint device to prevent water from flowing out of the rotating shaft and causing the rotating shaft to rust, thus ensuring the stable rotation of the grinding head assembly.

[0109] In this embodiment of the abrasion testing machine, during rotation, the rotating component 3 can rotate and move downwards simultaneously, stably transmitting the pressure load from the rotating shaft 31 to the annular plate 32, and then stably transmitting it to the grinding head assembly 5 via the annular plate 32. The first bearing and the second bearing ensure that the rotating shaft 31 does not shift during operation, guaranteeing uniform load on the sample 100.

[0110] Furthermore, if the inlet sleeve 62 rotates with the inlet column 61, the pipeline of the inlet device connected to the inlet connector 64 will become entangled, which is not conducive to the smooth progress of the test. Therefore, the water supply assembly 6 also includes a limiting structure, which can restrict the rotation of the inlet sleeve 62 while also allowing the inlet sleeve 62 to rise and fall. Furthermore, as... Figure 25 and Figure 26 As shown, the limiting structure includes a limiting post 66 located outside the central axis on the upper end face of the water inlet sleeve 62 and a baffle plate 67 slidably connected to the limiting post 66. One end of the baffle plate 67 has a through hole, and the limiting post 66 is fitted into the through hole with a clearance fit and passes through the through hole of the baffle plate 67. The other end of the baffle plate 67 is fixed to the side of the vertical fixing plate 19. The water inlet column 61 rotates synchronously with the rotating shaft 31. Because the limiting post 66 on the water inlet sleeve 62 is in the baffle plate 67, the water inlet sleeve 62 will not rotate with the rotating shaft 31. However, when the rotating shaft 31 rises and falls, it will drive the water inlet sleeve 62 to rise and fall synchronously, and the limiting post 66 on the water inlet sleeve 62 can rise and fall within the through hole of the baffle plate 67. Figure 26As shown. In other words, the setting of the limiting post 66 and the baffle plate 67 can both restrict the rotation of the water inlet sleeve 62 and enable the water inlet sleeve 62 to rise and fall.

[0111] The wear resistance testing machine of this embodiment further includes a load assembly 7 sleeved on the rotating assembly 3, used to provide load to the grinding head assembly 5, and the load assembly 7 rotates relative to the rotating shaft 31. Figures 27 to 29 As shown, the load assembly 7 includes a load cylinder 71. An upper groove and a lower groove are respectively provided at the central axis positions of the upper and lower ends of the load cylinder 71. A third bearing 72 is disposed in the upper groove, and a fourth bearing 73 is disposed in the lower groove. The rotating assembly 3 passes through the third bearing 72 and the fourth bearing 73 and is rotatably connected to them. Two spaced slots are provided in the middle of the rotating shaft 31 along the circumferential direction. Clamps 74 are disposed in each slot. One clamp 74 is disposed on the upper surface of the third bearing 72, and the other clamp 74 is disposed on the lower surface of the fourth bearing 73. The clamps 74 fix the load assembly 7 axially on the rotating shaft 31, preventing the load assembly 7 from moving up and down relative to the rotating shaft 31. The load assembly 7 ensures that the pressure load on the grinding head assembly 5 is between 151.5N and 156.5N. The load sources for the grinding head assembly 5 include the rotating assembly 3 and the load assembly 7.

[0112] The third bearing 72 and the fourth bearing 73 together constrain the load cylinder 71, preventing the central axis of the load cylinder 71 from not coinciding with the central axis of the rotating shaft 31, ensuring that the load assembly 7 applies load evenly to the grinding head assembly 5, further improving the uniformity of the annular grinding groove size of the sample 100, and ensuring the smooth progress of the test.

[0113] To detect the downward travel of the rotating component 3 during the grinding of the sample 100 by the abrasion testing machine, and thus the depth of the annular grinding groove 110, the abrasion testing machine also includes a detection component 8. The detection component 8 includes a crossbar 81 and a displacement detection component 82. One end of the crossbar 81 is positioned on the circumferential surface of the load cylinder 71, and the crossbar 81 is perpendicular to the central axis of the load cylinder 71. The displacement detection component 82 is used to detect the displacement of the crossbar 81. The abrasion testing machine can ensure that the downward travel of the rotating component 3 is not less than 10 mm. The displacement detection component 82 can detect the height of the crossbar 81, thereby detecting the downward travel of the rotating component 3, ensuring compliance with test requirements. The displacement detection component 82 detects the depth of the annular grinding groove 110, and when the depth of the annular grinding groove 110 reaches the predetermined requirement, the displacement detection component 82 transmits a command to the control unit to stop the first drive component 4.

[0114] Furthermore, to limit the movement of the crossbar 81, the displacement detection component 82 detects the displacement of the crossbar 81 in real time. The detection assembly 8 also includes a limiting plate 83, which is fixedly disposed at the end of the first fixed plate 11 and the second fixed plate 14 away from the vertical fixed plate 19. The limiting plate 83 has an elongated limiting hole 831 along the axial direction parallel to the rotating shaft 31, through which the crossbar 81 passes. The displacement detection component 82 can be fixed on the side of the limiting plate 83 near the load cylinder 71 or on the side of the limiting plate 83 away from the load cylinder 71. The displacement detection component 82 is connected and fixed to the limiting plate 83 through a sensor bracket 84. Due to the limiting effect of the limiting hole 831, the crossbar 81 can only move along the axial direction of the rotating shaft 31, and the displacement detection component 82 can continuously detect the downward movement of the rotating assembly 3. At the same time, the crossbar 81 ensures that the load cylinder 71 does not rotate with the rotating assembly 3.

[0115] The displacement detection component 82 can be a contact displacement sensor, such as a pull-cord displacement sensor or a pressure displacement sensor; the displacement detection component 82 can also be a non-contact displacement sensor, such as a laser rangefinder, an infrared rangefinder, or a photoelectric sensor. In this embodiment, the displacement detection component 82 is a dial indicator, which includes a dial indicator body 821 and a finger rod 822. A blocking block 823 is fixedly installed at the top of the finger rod 822, and a lifting column 824 is provided on the top surface of the blocking block 823. The sensor bracket 84 includes a fixed mounting part 841 and a horizontal plate part 842 located at the top of the fixed mounting part 841. The horizontal plate part 842 is provided with a limit groove 843 and a sliding groove 844 perpendicular to the limit groove 843 and penetrating the horizontal plate part 842. When it is not necessary to detect the position of the horizontal bar 81, the rotating component 3 operates normally. At this time, in order to avoid damage to the dial indicator by the horizontal bar 81, the blocking block 823 is placed in the limit groove 843. At this time, the bottom end of the finger rod 822 is away from the horizontal bar 81, such as... Figure 31 As shown. When it is necessary to detect the position of the crossbar 81, the rotating assembly 3 stops operating. The tester lifts the finger rod 822 by hand on the lifting column 824, so that the blocking block 823 is away from the limiting groove 843, and rotates the finger rod 822 90 degrees. The blocking block 823 is in the sliding groove 844. At this time, the bottom end of the finger rod 822 contacts the crossbar 81, and the position of the crossbar 81 can be detected. Figure 32 As shown. The blocking block 823 prevents damage to the displacement detection component during the rotation of the rotating assembly 3, ensuring the smooth progress of the test.

[0116] To detect the number of revolutions of the grinding head assembly 5 during the grinding of sample 100 by the abrasion testing machine, the detection assembly 8 also includes a revolution detection sensor 85 and a detection column 86 fixedly mounted on one side of the annular support 51. The revolution detection sensor is positioned at the same height on the outer side of the annular support 51. Figure 26 As shown. The rotation speed sensor 85 is fixedly mounted on the vertical fixed plate 19. The rotation of the rotating shaft 31 drives the annular support base 51 to rotate, and the detection column 86 rotates along with the rotation of the annular support base 51. The rotation speed sensor 85 counts the rotation speed of the detection column 86 to obtain the number of rotations of the grinding head assembly 5. The rotation speed sensor 85 detects the rotation speed of the grinding head assembly 5, and when the rotation speed of the grinding head assembly 5 reaches a predetermined requirement, the rotation speed sensor 85 transmits a command to the control unit to control the first drive assembly 4 to stop operating.

[0117] The abrasion testing machine also includes protective components 9 arranged around the worktable 18 to prevent water splashing from the water supply component 6 during the grinding process of the grinding head assembly 5 on the sample 100, thus preventing contamination of the surrounding testing environment. Specifically, such as Figure 30 As shown, the protective assembly 9 includes a side wall 91 and a door 92 movably connected to the side wall 91, with the connection between the side wall 91 and the door 92 being hinged. When the door 92 is open relative to the side wall 91, it facilitates the placement or removal of the sample 100 by the testing personnel; when the door 92 is closed relative to the side wall 91, it prevents water splashing generated when the water supply assembly 6 washes the sample 100 from contaminating the surrounding testing environment. Furthermore, the door 92 can be made of transparent material, facilitating observation of the grinding process of the grinding head assembly 5 on the sample 100. The door 92 is also equipped with a handle for easy operation by the testing personnel.

[0118] As one embodiment, a control room is located below the workbench 18. The control room houses a control unit, which includes a controller and control buttons. The controller is electrically connected to the second drive assembly 22, the first drive assembly 4, the water supply assembly 6, the displacement detection component 82, and the rotational speed detection sensor 85. The controller performs process control and acquires data from the sensors. The control buttons control the operation and shutdown of the second drive assembly 22, the first drive assembly 4, and the water supply assembly 6.

[0119] Furthermore, the abrasion testing machine also includes support bases located at the four corners of the bottom of the control room to support the entire abrasion testing machine.

[0120] In this embodiment of the invention, "up" and "down" refer to the upward and downward directions of the axial direction of the rotating shaft 31, and also to the upward and downward directions of the bottom end of the positioning support column 13 in a plane perpendicular to it.

[0121] The test steps for testing the abrasion resistance of the specimens using the abrasion testing machine according to an embodiment of the present invention are as follows:

[0122] S1. Place the sample 100 on the sample placement platform 21, with the grinding surface of the sample 100 facing the rotating assembly 3.

[0123] S2. Place the grinding head assembly 5 on the grinding surface of the sample 100;

[0124] S3. Control the second drive assembly 22 to lift the sample 100 until the grinding surface contacts the positioning support column 13, so that the annular slide 33 presses precisely on the ball 52 of the grinding head assembly 5.

[0125] S4. Start the rotation source 41. After the grinding head assembly 5 has pre-ground for 30 revolutions, stop the machine and measure the initial grinding groove depth h1. Then, stop the machine once every 1000 revolutions of the grinding head assembly 5 and measure the grinding groove depth h2.

[0126] S5. The test ends when the rotational speed of the grinding head assembly 5 detected by the rotational speed sensor 85 reaches 5000 revolutions or the depth of change (h2-h1) of the annular grinding groove 110 detected by the displacement detection component 82 reaches 1.5mm or more. The test is terminated if either of the two conditions—the rotational speed of the grinding head assembly 5 reaching 5000 revolutions or the depth of change (h2-h1) of the annular grinding groove 110 reaching 1.5mm—is met, prioritizing the latter condition.

[0127] In the embodiments of this invention, descriptions involving "first," "second," "third," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," or "third" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0128] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. An abrasion testing machine for grinding a specimen (100) and forming an annular grinding groove (110) on the specimen (100), characterized in that, include: The grinding head assembly (5) is placed on the grinding surface of the sample (100) to grind the sample (100); the grinding head assembly (5) includes an annular support seat (51) and multiple balls (52) that are rolledly connected to the annular support seat (51), and the top and bottom walls of the balls (52) protrude from the annular support seat (51) respectively. The rotating assembly (3) is movably connected to the grinding head assembly (5) and is used to drive the grinding head assembly (5) to grind the sample (100). The rotating assembly (3) includes a rotating shaft (31) and an annular plate (32) fixed to the bottom end of the rotating shaft (31). An annular slide (33) that cooperates with the grinding head assembly (5) is provided on the bottom surface of the annular plate (32) along the circumferential direction. The first drive assembly (4) is connected to the rotating assembly (3) and is used to drive the rotating assembly (3) to rotate. The first drive assembly (4) includes a rotation source (41), a drive wheel (42) connected to the drive end of the rotation source (41), a driven wheel (43) connected to the rotating assembly (3), a belt (44) sleeved on the drive wheel (42) and the driven wheel (43), and a first coupling (45) between the rotating assembly (3) and the driven wheel (43). The rotating component (3) rotates with the first coupling (45) and moves up and down relative to the first coupling (45); A fixed component (1) is rotatably connected to a rotating component (3) to limit the rotation component (3); the fixed component (1) includes a first fixed plate (11) perpendicular to the axial direction of the rotating shaft (31) and a first bearing sleeve (12) fixedly disposed on the first fixed plate (11). The first bearing sleeve (12) is inlaid with a first bearing. The first fixed plate (11) has a first through hole. The rotating component (3) is slidably connected to the inner ring of the first bearing. The lower surface of the first fixed plate (11) is provided with at least three fixed bearings on the outer side of the rotating shaft (31) parallel to the axial direction of the rotating shaft (31). Positioning support column (13), the bottom ends of multiple positioning support columns (13) are coplanar; the fixing assembly (1) also includes a second fixing plate (14) perpendicular to the axis of the rotating shaft (31) and a cylindrical driven wheel support seat (15) fixedly disposed on the second fixing plate (14). The driven wheel (43) is disposed on the upper surface of the driven wheel support seat (15). A second bearing is disposed in the inner cavity of the driven wheel support seat (15). The outer ring of the second bearing is fitted and fixed with the driven wheel support seat (15). The inner ring of the second bearing is sleeved with the first coupling (45) and rotates synchronously with the first coupling (45). The support assembly (2) is used to support the sample (100) and can drive the sample (100) to move up and down; the support assembly (2) includes a sample placement stage (21), a second drive assembly (22) connected to the sample placement stage (21), and a universal joint (23) between the sample placement stage (21) and the second drive assembly (22). The control unit is electrically connected to the support assembly (2) and the first drive assembly (4) respectively, and is used to control the support assembly (2) and the first drive assembly (4) to perform actions; When the second drive assembly (22) operates and drives the sample (100) to rise to contact with the positioning support column (13), the grinding surface of the sample (100) is in contact with the bottom plane of the positioning support column (13), the sample (100) is automatically positioned parallel to the grinding head assembly (5), the sample (100) is sandwiched between the positioning support column (13) and the sample placement platform (21), the top wall of the ball (52) is in contact with the annular slide (33), and the bottom wall of the ball (52) is in contact with the grinding surface of the sample (100).

2. The abrasion resistance testing machine according to claim 1, characterized in that, It also includes a water supply assembly (6) set at the bottom of the rotating assembly (3). The water supply assembly (6) includes a water inlet column (61) fixedly set at the bottom of the rotating shaft (31), a water inlet sleeve (62) sleeved on the water inlet column (61), and a connecting plate (63) fixedly set at the bottom end face of the water inlet column (61). The inner diameter of the water inlet sleeve (62) is smaller than the diameter of the rotating shaft (31). The upper end face of the water inlet sleeve (62) is connected to the bottom end face of the rotating shaft (31). The water inlet sleeve (62) is confined between the rotating shaft (31) and the connecting plate (63). The water inlet column (61) has a water inlet channel that communicates with the inner cavity of the water inlet sleeve (62). A radial through-connection hole (621) is provided on the circumferential surface of the water inlet sleeve (62). A water inlet connector (64) is provided on the through-connection hole (621). The water inlet connector (64) is connected to the water inlet device. The connecting plate (63) has a through first water outlet hole (631) at the center axis position, and the water inlet channel is connected to the first water outlet hole (631).

3. The abrasion testing machine according to claim 2, characterized in that, The connecting plate (63) is a stepped first connecting plate (632) and a second connecting plate (633). There is a transition surface (634) between the first connecting plate (632) and the second connecting plate (633). A circular groove (635) is opened in the center of the top surface of the first connecting plate (632). The bottom end of the water inlet column (61) is embedded in the circular groove (635). The top surface of the first connecting plate (632) is connected to the bottom surface of the water inlet sleeve (62). The second connecting plate (633) is embedded in the inner cavity of the annular plate (32), and the transition surface (634) is in contact with the top surface of the annular plate (32); The rotating assembly (3) also includes a mounting plate (34), an annular plate (32) is disposed between the mounting plate (34) and the first connecting plate (632), and the annular plate (32) is spaced apart from the water inlet sleeve (62).

4. The abrasion testing machine according to claim 2, characterized in that, The water supply component (6) also includes a limiting structure, which restricts the rotation of the inlet sleeve (62) while enabling the inlet sleeve (62) to rise and fall.

5. The abrasion resistance testing machine according to claim 4, characterized in that, The limiting structure includes a limiting post (66) located outside the central axis on the upper end face of the water inlet sleeve (62) and a baffle plate (67) slidably connected to the limiting post (66). One end of the baffle plate (67) has a through hole, and the limiting post (66) is fitted with the through hole with a clearance and passes through the through hole of the baffle plate (67). The other end of the baffle plate (67) is fixedly connected to the fixing component (1).

6. The abrasion resistance testing machine according to claim 1, characterized in that, It also includes a load assembly (7) fitted on the rotating assembly (3) for providing load to the grinding head assembly (5); The load assembly (7) includes a load cylinder (71). The upper and lower ends of the load cylinder (71) are respectively provided with an upper groove and a lower groove at the central axis position. A third bearing (72) is provided in the upper groove and a fourth bearing (73) is provided in the lower groove. The rotating assembly (3) is rotatably connected to the third bearing (72) and the fourth bearing (73) respectively. The middle part of the rotating shaft (31) has two spaced slots along the circumferential direction. A clamp (74) is provided in each slot. One clamp (74) is provided on the upper surface of the third bearing (72) and the other clamp (74) is provided on the lower surface of the fourth bearing (73). The clamp (74) fixes the load assembly (7) in the axial direction of the rotating shaft (31).

7. The abrasion resistance testing machine according to claim 6, characterized in that, It also includes a detection component (8); The detection assembly (8) includes a crossbar (81) and a displacement detection component (82). One end of the crossbar (81) is set on the circumferential surface of the load cylinder (71). The crossbar (81) is perpendicular to the central axis of the load cylinder (71). The displacement detection component (82) is used to detect the displacement of the crossbar (81). The detection assembly (8) also includes a limiting plate (83). The limiting plate (83) is fixedly set on the end of the first fixing plate (11) and the second fixing plate (14) away from the vertical fixing plate (19). The limiting plate (83) has an elongated limiting hole (831) along the axial direction parallel to the rotating shaft (31). The crossbar (81) passes through the limiting hole (831). The detection assembly (8) also includes a rotation detection sensor (85) and a detection column (86) fixedly installed on one side of the annular support (51). The rotation detection sensor (85) is installed at the same height on the outside of the annular support (51). The rotation detection sensor (85) is fixedly installed on the fixing assembly (1).

8. The abrasion testing machine according to claim 1, characterized in that, A groove is provided on one of the side wall (91) of the rotating shaft (31) and the inner side wall (91) of the first coupling (45), and a positioning protrusion that cooperates with the groove is provided on the other side wall (91) of the rotating shaft (31) and the inner side wall (91) of the first coupling (45). The positioning protrusion is slidably arranged relative to the groove.

9. The abrasion testing machine according to claim 1, characterized in that, The fixed assembly (1) also includes a third fixed plate (16) above the rotating source (41) and a cylindrical drive wheel support (17) fixed on the third fixed plate (16). The drive wheel (42) is located on the upper surface of the drive wheel support (17). The third fixed plate (16) has a third through hole (161). The second coupling connected to the drive end of the rotating source (41) passes through the third through hole (161) and is connected to the drive wheel (42). The fixing assembly (1) also includes a worktable (18) and a vertical fixing plate (19) located on the upper surface of the worktable (18) and perpendicular to the worktable (18). The first fixing plate (11) and the second fixing plate (14) are located on the same side of the vertical fixing plate (19) and are arranged parallel to each other at intervals. The second fixing plate (14) is located above the first fixing plate (11). The second fixing plate (14) is located on one side of the top of the vertical fixing plate (19), and the third fixing plate (16) is located on the other side of the top of the vertical fixing plate (19). The second fixing plate (14) and the third fixing plate (16) have the same height. The vertical fixing plate (19) is fixedly connected to the workbench (18), the first fixing plate (11), the second fixing plate (14) and the third fixing plate (16) respectively.

10. The abrasion testing machine according to claim 9, characterized in that, It also includes protective components (9) arranged around the top of the workbench (18); The protective component (9) includes a side wall (91) and a door (92) movably connected to the side wall (91).

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