Abrasion resistance testing machine

Abstract

The utility model 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 bearing, a second bearing and a part for fixing the first bearing and the second bearing, the first bearing sleeves the lower end of the rotating shaft, and the second bearing sleeves the upper end of the rotating shaft; the fixing assembly further comprises a first fixing plate perpendicular to the axial direction of the rotating shaft, the lower surface of the first fixing plate is provided with at least three positioning supporting columns which are parallel to the axial direction of the rotating shaft and located on the outer side of the rotating shaft, and the bottom ends of the multiple positioning supporting columns are coplanar. 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] The utility model relates to the field of concrete performance testing devices, in particular to a wear-resistant testing machine. Background Art

[0002] Concrete and its products are widely used in the construction industry, including foundations, bridges, tunnels, and building construction. To ensure the durability and stability of concrete products during use, wear resistance testing is essential. This testing ensures that concrete products meet safety standards.

[0003] The existing method for evaluating wear resistance is the ball bearing method. This method uses a ball bearing as a grinding head. When the grinding head rotates under a specified load, it produces rolling and sliding friction on the surface of the specimen. This creates a circular groove on the surface. The wear resistance is calculated by measuring the groove depth and the number of grinding revolutions of the grinding head.

[0004] However, in actual use, due to the uneven bottom surface of the sample relative to the grinding surface and the non-parallel factors between the supporting platform of the sample and the grinding surface, the size of the annular grinding groove is uneven, as shown in the figure of the specification. Figure 1 and Figure 2 As shown. Section 7.11.1.4 of JC / T 906-2023, "Cement-Based Wear-Resistant Materials for Concrete Floors," states: "Using the maximum groove width of specimen 100 as the reference point, measure the groove width of specimen 100 at 90 and 180 degrees of rotation from the reference point to an accuracy of 0.1 mm. The ratio of the maximum groove width to the minimum groove width should not exceed 1.5; otherwise, specimen 100 should be discarded." Such a test would waste test materials, affect test efficiency, and increase the workload of the experimenter. Utility Model Content

[0005] The utility model provides a wear-resistant testing machine, which is used to solve the problem of uneven sizes of annular grinding grooves after a sample is worn, thereby improving test efficiency.

[0006] The wear-resistant testing machine of the utility model is used for grinding a sample and forming an annular grinding groove on the sample, and comprises:

[0007] The grinding head assembly is placed on the grinding surface of the sample to grind the sample; the grinding head assembly includes an annular support seat and a plurality of balls rollingly connected to the annular support seat, and the top wall and bottom wall of the balls respectively protrude from the annular support seat;

[0008] The 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, and an annular slideway is provided on the bottom surface of the annular plate along the circumferential direction to cooperate with the grinding head assembly;

[0009] When grinding the specimen, the top wall of the ball contacts the annular slideway, and the bottom wall of the ball contacts the grinding surface of the specimen;

[0010] A first driving assembly is connected to the rotating assembly and is used to drive the rotating assembly to rotate;

[0011] The rotating assembly moves up and down relative to the first driving assembly;

[0012] A fixed assembly is rotatably connected to the rotating assembly to limit the rotating assembly; the fixed assembly includes a first bearing, a second bearing, and a component for fixing the first bearing and the second bearing, the first bearing being sleeved at the lower end of the rotating shaft, and the second bearing being sleeved at the upper end of the rotating shaft; the fixed assembly also includes a first fixed plate perpendicular to the axial direction of the rotating shaft, the lower surface of the first fixed plate being provided with at least three positioning support columns on the outside of the rotating shaft and parallel to the axial direction of the rotating shaft, the bottom ends of the plurality of positioning support columns being coplanar;

[0013] The support assembly is used to support the sample and can drive the sample to move up and down; it includes a sample placement table, a second drive assembly connected to the sample placement table, and a universal joint between the sample placement table and the second drive assembly;

[0014] and a control unit, electrically connected to the support assembly and the first drive assembly, respectively, for controlling the support assembly and the first drive assembly to perform actions;

[0015] When the second driving assembly drives the sample to rise and contact with the positioning support column, the grinding surface of the sample is connected with the bottom end plane of the positioning support column, and the sample is automatically positioned parallel to the grinding head assembly. The sample is clamped between the positioning support column and the sample placement table, the top wall of the ball is connected with the annular slide, and the bottom wall of the ball is connected with the grinding surface of the sample.

[0016] According to the aforementioned wear tester, the first drive assembly includes a rotation source, a driving wheel connected to the driving end of the rotation source, a driven wheel connected to the rotation assembly, a belt sleeved on the driving wheel and the driven wheel, and a first coupling between the rotation assembly and the driven wheel;

[0017] The fixing assembly also includes a first bearing sleeve arranged on the first fixing plate, the first fixing plate is provided with a first through hole, the first bearing sleeve is embedded in the first through hole, the first bearing is embedded in the first bearing sleeve, and the rotating assembly is slidably connected to the inner ring of the first bearing; it also includes a second fixing plate perpendicular to the axial direction of the rotating shaft and a cylindrical driven wheel support seat fixedly arranged on the second fixing plate, the driven wheel is arranged on the upper surface of the driven wheel support seat, and a second bearing is arranged in the inner cavity of the driven wheel support seat, the outer ring of the second bearing is embedded and fixed with the driven wheel support seat, and the inner ring of the second bearing is sleeved on the first coupling and rotates synchronously with the first coupling.

[0018] Furthermore, a slide 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 matching the above-mentioned slide groove is provided on the other one of the side wall of the rotating shaft and the inner side wall of the first coupling. The positioning protrusion and the slide groove are arranged to slide relative to each other, and the rotating shaft moves up and down relative to the first coupling.

[0019] Furthermore, the fixed assembly further includes a third fixed plate above the rotation source and a cylindrical driving wheel support seat fixedly disposed on the third fixed plate, the driving wheel being disposed on the upper surface of the driving wheel support seat, the third fixed plate being provided with a third through hole, the second coupling connected to the driving end of the rotation source being passed through the third through hole and connected to the driving wheel;

[0020] The fixing assembly also includes a workbench and a vertical fixing plate located on the upper surface of the workbench and perpendicular to the workbench, the first fixing plate and the second fixing plate are located on the same side of the vertical fixing plate and are spaced apart and arranged in parallel, the second fixing plate is located above the first fixing plate; the second fixing plate is arranged on one side of the top end of the vertical fixing plate, and the third fixing plate is arranged on the other side of the top end of the vertical fixing plate, and the second fixing plate and the third fixing plate are at the same height;

[0021] The vertical fixing plates are fixedly connected to the workbench, the first fixing plate, the second fixing plate and the third fixing plate respectively.

[0022] According to the aforementioned wear resistance testing machine, it also includes a water supply assembly arranged at the bottom end of the rotating assembly, the water supply assembly includes a water inlet column fixedly arranged at the bottom end of the rotating shaft, a water inlet sleeve sleeved on the water inlet column, and a connecting plate fixedly arranged on the bottom end surface of the water inlet column, the inner cavity diameter of the water inlet sleeve is smaller than the diameter of the rotating shaft, the upper end surface of the water inlet sleeve is in contact with the bottom end surface of the rotating shaft, the water inlet sleeve is defined between the rotating shaft and the connecting plate, the water inlet column is provided with a water inlet channel communicating with the inner cavity of the water inlet sleeve, a radial through-connecting hole is provided on the circumferential surface of the water inlet sleeve, a water inlet joint is provided on the through-connecting hole, and the water inlet joint is connected to the water inlet device;

[0023] A first water outlet hole is provided at the central axis of the connecting plate, and the water inlet channel is communicated with the first water outlet hole.

[0024] Furthermore, the connecting plate is a stepped first connecting plate and a second connecting plate, a transition surface is formed 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, the bottom end of the water inlet column is embedded in the circular groove, and the top surface of the first connecting plate is connected to the bottom surface of the water inlet sleeve;

[0025] The second connecting plate is embedded in the inner cavity of the annular plate, and the transition surface is connected to the top surface of the annular plate;

[0026] The rotating assembly further includes a mounting plate. The annular plate is arranged between the mounting plate and the first connecting plate. The annular plate and the water inlet sleeve are spaced apart.

[0027] Furthermore, the water supply assembly further includes a limiting structure, which limits the rotation of the water inlet sleeve while enabling the water inlet sleeve to be lifted and lowered;

[0028] The limiting structure includes a limiting column arranged on the outside of the central axis of the upper end surface of the water inlet sleeve and a blocking plate slidably connected to the limiting column. A through hole is opened at one end of the blocking plate. The limiting column is gap-fitted with the through hole and is passed through the through hole of the blocking plate. The other end of the blocking plate is fixedly connected to the fixing assembly.

[0029] According to the aforementioned wear tester, it also includes a load assembly mounted on the rotating assembly, for providing a load to the grinding head assembly;

[0030] The load assembly includes a load cylinder, and 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 apart grooves are provided in the middle part of the rotating shaft along the circumferential direction, and clamps are respectively provided in the grooves, one of the clamps 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 clamp fixes the load assembly in the axial direction of the rotating shaft.

[0031] Furthermore, it also includes a detection assembly; the detection assembly includes a cross bar and a displacement sensor, one end of the cross bar is arranged on the circumferential surface of the load cylinder, the cross bar is perpendicular to the central axis direction of the load cylinder, and the displacement sensor is used to detect the displacement of the cross bar; the detection assembly also includes a limit plate, the limit plate is fixedly arranged on the end of the first fixing plate and the second fixing plate on the side away from the vertical fixing plate, the limit plate is provided with an elongated limit hole along the axial direction parallel to the rotating shaft, and the cross bar passes through the limit hole;

[0032] The detection component also includes a rotation detection sensor and a detection column fixedly arranged on one side of the annular support seat. The rotation detection sensor is arranged at the same height position outside the annular support seat; the rotation detection sensor is fixedly arranged on the fixed component.

[0033] Furthermore, it also includes a protection component arranged around the workbench; the protection component includes a side wall and a door movably connected to the side wall.

[0034] The utility model has the following beneficial effects:

[0035] (1) The first driving assembly operates and provides rotational power to the rotating assembly through a belt; the first bearing and the second bearing limit the rotation of the rotating assembly to avoid the pressure perpendicular to the central axis of the rotating assembly caused by the power transmission, ensuring that the rotating assembly applies the rotational force evenly to the grinding head assembly, so that the grinding head assembly can evenly grind the sample; the setting of the universal joint in the support assembly enables the sample to automatically be positioned parallel to the grinding head assembly. The two work together to ensure that the annular grinding groove of the sample obtained by the wear test machine is uniform in size, and there is no problem of deep grinding groove on one side and shallow grinding groove on the other side, ensuring the smooth progress of the test;

[0036] (2) The water supply assembly is set at the bottom end of the rotating shaft, and an internal water supply rotary joint device is used to prevent water from flowing out of the rotating shaft and causing the rotating shaft to rust, thereby ensuring the stable rotation of the grinding head assembly;

[0037] (3) The load assembly is mounted on the rotating shaft to provide load evenly and stably;

[0038] (4) The protective component can prevent the water splashing generated by the water supply component when the grinding head component flushes the sample during the grinding process, causing pollution to the surrounding test environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A three-dimensional image of a failed specimen;

[0040] Figure 2 It is a top view of the unqualified specimen;

[0041] Figure 3 A three-dimensional image of a qualified specimen;

[0042] Figure 4 A top view of a qualified specimen;

[0043] Figure 5 A three-dimensional diagram of the main structure of the wear-resistant testing machine of the present invention;

[0044] Figure 6 for Figure 5 A partial enlarged view of point A in the middle;

[0045] Figure 7 This is a front view of the main structure of the wear-resistant testing machine of the present utility model;

[0046] Figure 8 is a perspective view of a fixed component;

[0047] Figure 9 A perspective view of the second drive assembly of the support assembly and the universal joint in connection state;

[0048] Figure 10A front view of the connection state of the rotating shaft, the first bearing sleeve, and the first bearing;

[0049] Figure 11 for Figure 10 Cross-sectional view along the BB direction;

[0050] Figure 12 is a schematic diagram of the first bearing sleeve and the first bearing in an exploded state;

[0051] Figure 13 A three-dimensional diagram of the connection state of the second fixing plate, the driven wheel support seat, the driven wheel, the first coupling, and the second bearing;

[0052] Figure 14 A top view of the second fixing plate, the driven wheel support seat, the driven wheel, the first coupling, and the second bearing in connection;

[0053] Figure 15 for Figure 14 Cross-sectional view in CC direction;

[0054] Figure 16 It is a front view of the connection state of the rotating component and the water supply component;

[0055] Figure 17 for Figure 16 Cross-sectional view along the DD direction;

[0056] Figure 18 It is a three-dimensional diagram of the water inlet column;

[0057] Figure 19 It is a cross-sectional view of the water inlet column;

[0058] Figure 20 is a three-dimensional diagram of the water inlet sleeve;

[0059] Figure 21 It is a top view of the water inlet sleeve;

[0060] Figure 22 for Figure 21 Cross-sectional view along the EE direction;

[0061] Figure 23 The three-dimensional limit plate Figure 1 ;

[0062] Figure 24 The three-dimensional limit plate Figure 2 ;

[0063] Figure 25 A perspective view of a water supply assembly with a limiting column and a blocking plate;

[0064] Figure 26 It is a partial connection diagram of the rotating assembly, water supply assembly, grinding head assembly and detection assembly;

[0065] Figure 27 is a perspective view of the load assembly;

[0066] Figure 28 It is the front view of the load assembly;

[0067] Figure 29 for Figure 28 Cross-sectional view in the FF direction;

[0068] Figure 30 A three-dimensional diagram of the wear testing machine with protective components.

[0069] Description of reference numerals:

[0070] 100, specimen; 110, annular grinding groove;

[0071] 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 pulley support seat; 16. Third fixing plate; 17. Driving pulley support seat; 18. Workbench; 19. Vertical fixing plate;

[0072] 2. Support assembly; 21. Sample placement table; 22. Second drive assembly; 23. Universal joint; 24. Limit cylinder;

[0073] 3. Rotating assembly; 31. Rotating shaft; 32. Annular plate; 33. Annular slideway; 34. Mounting plate;

[0074] 4. First drive assembly; 41. Rotation source; 42. Driving pulley; 43. Driven pulley; 44. Belt; 45. First coupling;

[0075] 5. Grinding head assembly; 51. Annular support seat; 52. Ball bearing;

[0076] 6. Water supply assembly; 61. Water inlet column; 611. Annular groove; 612. Horizontal water inlet hole; 613. Vertical water inlet hole; 62. Water inlet sleeve; 621. Through-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 column; 67. Blocking plate;

[0077] 7. Load assembly; 71. Load cylinder; 72. Third bearing; 73. Fourth bearing; 74. Clamp;

[0078] 8. Detection assembly; 81. Crossbar; 82. Displacement sensor; 83. Limit plate; 831. Limit hole; 84. Sensor bracket; 85. Rotation detection sensor; 86. Detection column;

[0079] 9. Protective assembly; 91. Side wall; 92. Door. DETAILED DESCRIPTION

[0080] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be combined with the accompanying drawings to Figures 3 to 30 The technical solution of the utility model is clearly and completely described in detail with specific embodiments.

[0081] The wear-resistant test machine of the present invention can produce a sample with uniform annular grinding grooves, without the problem of deep grinding grooves on one side and shallow grinding grooves on the other side. Figure 3 and Figure 4 As shown, ensure the smooth progress of the test.

[0082] like Figures 5 to 8 As shown, the wear tester of the embodiment of the present invention is used to grind a sample 100 and form an annular grinding groove 110 on the sample. The wear tester includes a fixing assembly 1, a supporting assembly 2, a rotating assembly 3, a first driving assembly 4, a grinding head assembly 5 and a control unit.

[0083] 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 slideway 33 cooperating with the grinding head assembly 5 is provided on the bottom surface of the annular plate 32 along the circumferential direction.

[0084] The support assembly 2 is located below the rotating assembly 3, and is used to support the sample 100 and can drive the sample to move up and down. 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 first drive assembly 4 is connected to the rotating assembly 3, and is used to drive the rotating assembly 3 to rotate. 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 corresponding actions. The fixed assembly 1 is used to fix the support assembly 2, and at the same time, the fixed assembly 1 is rotatably connected to the rotating assembly 3, which can realize the limitation of the rotating assembly 3.

[0085] The first driving assembly 4 is arranged 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 arranged 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 embedded in the first through hole. The first bearing sleeve 12 is embedded with a first bearing, and the outer ring of the first bearing is fixedly embedded in the first bearing sleeve 12. The rotating assembly 3 is inserted into the first through hole and coincides with the axis of the first bearing and is slidably connected to the inner ring of the first bearing, as shown in FIG. Figure 10 and Figure 11 The lower surface of the first fixing plate 11 is provided with at least three positioning support columns 13 on the outer side of the rotating shaft 31 and parallel to the axis of the rotating shaft 31. Figure 5 and Figure 6 As shown, the bottom ends of the multiple positioning support columns 13 are coplanar, ensuring that the positioning support columns 13 are in contact with the worn surface of the specimen 100. Specifically, the first fixing plate 11 is provided with a threaded hole along the outside of the first through hole, and the top end of the positioning support column 13 is threadedly connected to the threaded hole. Furthermore, a first annular protrusion is fixedly provided on the outside of the first bearing sleeve 12 in 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 embedded in the first through hole, realizing a fixed connection between the first fixing plate 11 and the first bearing sleeve 12, and the connection structure is stable.

[0086] Further, if Figure 11 and Figure 12 As 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. The 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, and the first bearing is disposed in 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. A first annular groove is provided at the top of the first bearing sleeve body 121. An annular upper cover 122 is connected to the first bearing sleeve body 121. An 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. A second annular groove is provided in the inner ring of the annular lower cover 123. A mounting ring plate 126 is fixedly connected to the bottom of the annular lower cover 123. A 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.

[0087] like Figures 13 to 15As shown, the fixed assembly 1 also includes a second fixed plate 14 perpendicular to the axial direction of the rotating shaft 31 and a cylindrical driven wheel support seat 15 fixedly mounted on the second fixed plate 14. The driven wheel 43 is mounted on the upper surface of the driven wheel support seat 15. A second bearing is disposed within the inner cavity of the driven wheel support seat 15. The second bearing includes a second bearing outer ring and a second bearing inner ring. The second bearing outer ring engages with the driven wheel support seat 15 to ensure relative fixation. The second bearing inner ring is sleeved onto the first coupling 45, and the second bearing inner ring rotates synchronously with the first coupling 45. Furthermore, the first coupling 45 is provided with a retaining groove along the outer circumference, and the second bearing is retained in position by a clamp disposed on the retaining groove. The second fixed plate 14 defines a second through-hole, and the rotating assembly 3 is inserted into the first coupling 45. To enhance the bearing's support for the rotating assembly 3, two stacked second bearings are disposed within the inner cavity of the driven wheel support seat 15. A second annular protrusion is fixedly provided on the outer side of the driven wheel support seat 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 seat 15 is equal to the diameter of the second through hole. The outer side of the bottom end of the driven wheel support seat 15 is embedded in the second through hole to realize the fixed connection between the second fixing plate 14 and the driven wheel support seat 15, and the connection structure is stable.

[0088] The first bearing is at the upper end of the rotating shaft 31 , and the second bearing is at the lower end of the rotating shaft 31 . The two bearings limit the bearings to ensure that the rotating shaft 31 does not deflect.

[0089] The fixed assembly 1 also includes a third fixed plate 16 above the rotation source 41 and a cylindrical driving wheel support seat 17 fixedly mounted on the third fixed plate 16. The driving wheel 42 is mounted on the upper surface of the driving wheel support seat 17. The third fixed plate 16 has a third through-hole. The second coupling connected to the driving end of the rotation source 41 is inserted through the third through-hole and connected to the driving wheel 42. A third annular protrusion is fixedly mounted along the circumference of the outer side of the driving wheel support seat 17 and is fixed to the third fixed plate 16 by screws.

[0090] The fixing assembly 1 also includes a workbench 18 and a vertical fixing plate 19 located on the upper surface of the workbench 18 and perpendicular to the workbench 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 in parallel with each other. The second fixing plate 14 is located above the first fixing plate 11. The second fixing plate 14 is arranged on one side of the top of the vertical fixing plate 19, and the third fixing plate 16 is arranged 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 of 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 workbench 18, the first fixing plate 11, the second fixing plate 14, and the third fixing plate 16, respectively, and the fixed connection method can be welding or threaded connection.

[0091] The support assembly 2 includes a sample placement table 21 and a second drive assembly 22 connected to the sample placement table 21. The second drive assembly 22 is used to drive the sample placement table 21 to move up and down, thereby driving the sample 100 placed on the sample placement table 21 to contact and separate from the positioning support column 13. The second drive assembly 22 is fixedly mounted on the bottom surface of the workbench 18. The support assembly 2 also includes a universal joint 23 between the sample placement table 21 and the second drive assembly 22, such as Figure 9 As shown, the position of the sample placement platform 21 can be adjusted. A limit cylinder 24 is provided at the bottom of the sample placement platform 21, and the universal joint 23 is disposed within the limit cylinder 24. The limit cylinder 24 limits the range of movement of the universal joint 23, preventing the universal joint 23 from moving too far and causing the sample 100 placed on the sample placement platform 21 to fall. The second drive assembly 22 includes, but is not limited to, linear drive elements such as pneumatic cylinders, hydraulic cylinders, and electric push rods.

[0092] Due to the setting of the universal joint 23, the sample placement table 21 can automatically adjust its orientation; when the sample 100 contacts the positioning support column 13, the grinding surface of the sample 100 is connected to the bottom end plane of the positioning support column 13, and the sample 100 is automatically positioned parallel to the grinding head assembly 5, effectively avoiding eccentric grinding of the sample 100 and improving the success rate of the test.

[0093] like Figure 5 and Figure 7 As shown, the first drive assembly 4 includes a rotation source 41 fixed to the fixed assembly 1, a driving pulley 42 connected to the driving end of the rotation source 41, a driven pulley 43 connected to the rotating assembly 3, and a belt 44 mounted on the driving pulley 42 and the driven pulley 43. The first drive assembly 4 also includes a first coupling 45 between the rotating assembly 3 and the driven pulley 43. The first coupling 45 is connected to the driven pulley 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 rotation source 41 and the driving pulley 42. The operation of the rotation source 41 drives the driving pulley 42, which in turn drives the driven pulley 43 via the belt 44, thereby driving the first coupling 45 to rotate. The first coupling 45 then 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 specimen 100, the rotating assembly 3 can move downward along with the grinding head assembly 5. The rotation source 41 may be a device capable of outputting rotation, such as an electric motor, an engine, a hydraulic motor, or a combination of one of these and a speed reducer. Preferably, the rotation source 41 is a small and technologically mature servo motor, the speed of which can be adjusted, and the grinding head assembly 5 can be rotated at a low speed.

[0094] In order to enable the rotating assembly 3 to move up and down relative to the first coupling 45 while rotating, a slide 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 can cooperate with the above-mentioned slide groove is provided on the other of the side wall of the rotating shaft 31 and the inner side wall of the first coupling 45. The positioning protrusion and the slide groove are arranged to slide relative to each other, thereby enabling the rotating assembly 3 to move up and down relative to the first coupling 45. In this embodiment, the slide groove is provided on the side wall of the rotating shaft 31, and the positioning protrusion is provided on the inner side wall of the first coupling 45. In addition, the rotating shaft 31 can also be a spline shaft, which, in combination with the second bearing, can also achieve longitudinal sliding on the shaft while rotating.

[0095] The first fixing 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 fixing 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. This structural connection ensures that the rotating shaft 31 does not deviate.

[0096] The grinding head assembly 5 includes an annular support seat 51 and a plurality of balls 52 rollingly connected to the annular support seat 51, and the top wall and bottom wall of the balls 52 respectively protrude from the annular support seat 51. When the wear tester grinds the sample 100, the top wall of the balls 52 connects with the annular slideway 33, and the bottom wall of the balls 52 connects with the grinding surface of the sample 100. The annular support seat 51 is provided with a fixed groove for accommodating the balls 52, and the plurality of balls 52 are rollingly connected in the fixed groove. The grinding head assembly 5 can use a 13*15.875mm ball bearing, and the hardness of the balls 52 is greater than HRC62.

[0097] The first driving assembly 4 runs and provides rotational power to the rotating assembly 3 through the belt 44. The first bearing and the second bearing limit the rotating assembly 3 during rotation, avoiding the pressure perpendicular to the central axis of the rotating assembly 3 caused by power transmission on the rotating assembly 3, ensuring that the rotating assembly 3 applies the rotational action evenly to the grinding head assembly 5, so that the grinding head assembly 5 can evenly grind the sample 100.

[0098] When the second drive assembly 22 operates to drive the sample 100 to rise and contact with the positioning support column 13, the grinding surface of the sample 100 is connected to the bottom end plane of the positioning support column 13, and 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 table 21, the top wall of the ball 52 is connected to the annular slide 33, and the bottom wall of the ball 52 is connected to the grinding surface of the sample 100.

[0099] The first bearing and the second bearing of the fixed component 1 limit the rotation of the rotating component 3, and the setting of the universal joint 23 in the supporting component 2 enables the sample 100 to be automatically positioned parallel to the grinding head component 5. The two work together to ensure that the annular grinding grooves of the sample obtained by the wear-resistant testing machine are uniform in size, and there is no problem of deep grinding grooves on one side and shallow grinding grooves on the other side, thereby ensuring the smooth progress of the test.

[0100] The wear-resistant testing machine can meet the requirements of wear-resistant tests for samples 100 of different sizes. The specific sizes of the samples 100 are: length 100-200 mm, width 100-200 mm, and thickness 5-50 mm.

[0101] The powder generated during the grinding process of the sample 100 by the wear test machine will affect the grinding process, and the powder needs to be removed from the grinding surface of the sample 100 in a timely manner. The wear test machine also includes a water supply component 6 arranged at the bottom end of the rotating component 3. Figure 16 and Figure 17 As shown, the water supply assembly 6 includes a water inlet column 61 fixedly arranged 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 arranged on the bottom end surface of the water inlet column 61. The water inlet sleeve 62 is limited between the rotating shaft 31 and the connecting plate 63. The connecting plate 63 is used to limit the downward position of the water inlet sleeve 62, which can prevent the water inlet sleeve 62 from falling off the water inlet column 61, thereby ensuring that the water supply assembly 6 can work normally. The water inlet column 61 is provided with a water inlet channel that communicates with the inner cavity of the water inlet sleeve 62. The circumferential surface of the water inlet sleeve 62 is provided with a radial through-connecting hole 621. The through-connecting hole 621 is provided with a water inlet connector 64, and the water inlet connector 64 is connected to the water inlet device. Specifically, the inner cavity diameter of the water inlet sleeve 62 is smaller than the diameter of the rotating shaft 31, and the upper end surface of the water inlet sleeve 62 is connected to the bottom end surface 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 is provided with a first annular groove 622 and a second annular groove 623, spaced axially along the circumference. A sealing ring 65 is disposed in each of the first and second annular grooves 622 and 623 to prevent water from flowing out between the water inlet cylinder 61 and the water inlet sleeve 62 when the water inlet cylinder 61 rotates. A first water outlet hole 631 is formed through the central axis of the connecting plate 63, and the water inlet channel communicates with the first water outlet hole 631. The connecting plate 63 is fixed to the bottom end surface of the water inlet cylinder 61 by screws.

[0102] The structure of the water inlet column is as follows Figure 18 and Figure 19As shown in FIG. 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 radial horizontal water inlet holes 612 are 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. Axial vertical water inlet holes 613 are provided inside the water inlet column 61. The top of the vertical water inlet hole 613 intersects and communicates with the horizontal water inlet hole 612, and the bottom 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 61, then flows through the horizontal water inlet hole 612, and then flows down through the vertical water inlet hole 613.

[0103] 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.

[0104] like Figure 23 and Figure 24 As shown, the connecting plate 63 is a stepped first connecting plate 632 and a second connecting plate 633, a transition surface 634 is formed between the first connecting plate 632 and the second connecting plate 633, and a circular groove 635 is formed in the center of the top surface of the first connecting plate 632. Figure 17 As 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 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 connected to the top surface of the annular plate 32, and the connection structure is stable. The rotating assembly 3 also includes a mounting plate 34, and the annular plate 32 is arranged 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, which can avoid friction between the annular plate 32 and the water inlet sleeve 62 when the annular plate 32 rotates relative to the water inlet sleeve 62.

[0105] 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 finally to the grinding head assembly 5 through the annular plate 32. The component connection structure is stable, ensuring that the pressure load is stably applied to the grinding head assembly 5.

[0106] A water inlet column and a water inlet sleeve are provided at the bottom of the rotating shaft of the wear-resistant testing machine of the present utility model embodiment, and an internal water supply rotary joint device is adopted to prevent water from flowing out of the rotating shaft and causing the rotating shaft to rust, thereby ensuring the stable rotation of the grinding head assembly.

[0107] During the rotation of the wear tester according to the present embodiment, the rotating assembly 3 can simultaneously rotate and move downward, stably transmitting the pressure load from the rotating shaft 31 to the annular plate 32, and then to the grinding head assembly 5 via the annular plate 32. The first and second bearings prevent the rotating shaft 31 from deflecting during operation, ensuring uniform loading of the specimen 100.

[0108] Furthermore, if the water inlet sleeve 62 rotates with the water inlet column 61, the pipe of the water inlet device connected to the water inlet connector 64 will be entangled, which is not conducive to the smooth progress of the test. Therefore, the water supply component 6 also includes a limiting structure, which can limit the rotation of the water inlet sleeve 62 and realize the lifting and lowering of the water inlet sleeve 62. Figure 25 and Figure 26 As shown, the limiting structure includes a limiting post 66 arranged on the outside of the central axis of the upper end face of the water inlet sleeve 62 and a blocking plate 67 slidably connected to the limiting post 66. A through hole is provided at one end of the blocking plate 67. The limiting post 66 is fitted with a clearance between the through hole and is passed through the through hole of the blocking plate 67. The other end of the blocking 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. Since the limiting post 66 on the water inlet sleeve 62 is in the blocking plate 67, the water inlet sleeve 62 will not rotate with the rotating shaft 31. When the rotating shaft 31 rises and falls, it will drive the water inlet sleeve 62 to rise and fall synchronously. The limiting post 66 on the water inlet sleeve 62 can rise and fall in the through hole of the blocking plate 67, as shown in FIG. Figure 26 That is to say, the arrangement of the limiting column 66 and the blocking plate 67 can satisfy the requirements of limiting the rotation of the water inlet sleeve 62 and realizing the lifting of the water inlet sleeve 62.

[0109] The wear tester of the present invention further comprises a load assembly 7 mounted on the rotating assembly 3 for providing a load to the grinding head assembly 5. 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. Upper and lower grooves are defined at the center axis of the upper and lower ends of the load cylinder 71, respectively. 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 is respectively inserted into and rotatably connected to the third and fourth bearings 72 and 73. Two spaced-apart slots are defined along the circumference of the central portion of the rotating shaft 31. Each slot contains a clamp 74. One clamp 74 is located on the upper surface of the third bearing 72, and the other is located on the lower surface of the fourth bearing 73. The clamps 74 secure the load assembly 7 axially to the rotating shaft 31, preventing it from moving up and down relative to the rotating shaft 31. The configuration of the load assembly 7 ensures that the pressure load on the grinding head assembly 5 is between 151.5N and 156.5N. The load on the grinding head assembly 5 is supplied by the rotating assembly 3 and the load assembly 7.

[0110] The third bearing 72 and the fourth bearing 73 jointly constrain the load cylinder 71 to prevent 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 a uniform load 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.

[0111] To detect the downward travel of the rotating assembly 3 during the grinding process of the specimen 100, and thereby the depth of the annular grinding groove 110, the wear testing machine further includes a detection assembly 8. Detection assembly 8 comprises a crossbar 81 and a displacement detection component 82. One end of crossbar 81 is disposed on the circumferential surface of the load cylinder 71, perpendicular to the central axis of the load cylinder 71. Displacement detection component 82 is electrically connected to a control unit and is used to detect the displacement of crossbar 81. The wear testing machine can ensure that the downward travel of the rotating assembly 3 is no less than 10 mm. Displacement detection component 82 can detect the height of crossbar 81 and, therefore, the downward travel of the rotating assembly 3, ensuring compliance with test requirements. Displacement detection component 82 detects the depth of the annular grinding groove 110. When the depth of the annular grinding groove 110 reaches a predetermined requirement, displacement detection component 82 transmits a command to the control unit, causing the first drive assembly 4 to stop operating. Displacement detection component 82 can be a contact-type displacement sensor, such as a pull-wire displacement sensor or a pressure displacement sensor. The displacement detection component 82 may also be a non-contact displacement sensor, which may be a laser distance sensor, an infrared distance sensor or a photoelectric sensor.

[0112] Furthermore, in order to limit 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 limit plate 83. The limit plate 83 is fixedly arranged at the end of the first fixing plate 11 and the second fixing plate 14 on the side away from the vertical fixing plate 19. The limit plate 83 is provided with an elongated limit hole 831 along the axial direction parallel to the rotation shaft 31. The crossbar 81 passes through the limit hole 831. The displacement detection component 82 can be fixed to the side of the limit plate 83 close to the load cylinder 71, or fixed to the side of the limit plate 83 away from the load cylinder 71. The displacement detection component 82 is connected and fixed to the limit plate 83 via a sensor bracket 84. Due to the limiting effect of the limit hole 831, the crossbar 81 can only move along the axial direction of the rotation shaft 31, and the displacement detection component 82 can continuously detect the downward movement of the rotating assembly 3. At the same time, the setting of the crossbar 81 can prevent the load cylinder 71 from rotating with the rotating assembly 3.

[0113] In order to detect the number of revolutions of the grinding head assembly 5 during the grinding process of the wear tester on the sample 100, the detection assembly 8 also includes a revolution detection sensor 85 and a detection column 86 fixedly arranged on one side of the annular support seat 51. The revolution detection sensor is arranged at the same height position outside the annular support seat 51, as shown in FIG. Figure 26 As shown, the rotation detection sensor 85 is fixed to 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 in response to the rotation of the annular support base 51. The rotation detection sensor 85 counts the detection column 86 to obtain the number of rotations of the grinding head assembly 5. The rotation detection sensor 85 detects the rotation of the grinding head assembly 5. When the rotation of the grinding head assembly 5 reaches a predetermined requirement, the rotation detection sensor 85 transmits a command to the control unit to control the first drive assembly 4 to stop operation.

[0114] The wear tester also includes a protective assembly 9 arranged around the workbench 18 to prevent the water splashing generated by the water supply assembly 6 when the grinding head assembly 5 is grinding the sample 100 and polluting the surrounding test environment. Specifically, Figure 30 As shown, the protective assembly 9 includes a side wall 91 and a door 92 movably connected to the side wall 91, and the connection between the side wall 91 and the door 92 is hinged. When the door 92 is open relative to the side wall 91, it is convenient for the test personnel to place or remove the sample 100; when the door 92 is closed relative to the side wall 91, it can prevent the water splashing generated when the water supply assembly 6 flushes the sample 100 from polluting the surrounding test environment. Furthermore, the door 92 can be made of a transparent material to facilitate observation of the grinding process of the grinding head assembly 5 on the sample 100. A handle is also provided on the door 92 to facilitate the experimenter to operate the door 92 to open and close.

[0115] As an example, 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 rotation detection sensor 85. The controller implements process control and sensor data acquisition. The control buttons activate and deactivate the second drive assembly 22, the first drive assembly 4, and the water supply assembly 6.

[0116] Furthermore, the wear-resistant testing machine also includes support bases arranged at the four corners of the bottom of the control room for supporting the entire wear-resistant testing machine.

[0117] “Up” and “Down” in the embodiment of the present invention refer to upward and downward in the axial direction of the rotating shaft 31 , and also refer to upward and downward perpendicular to the coplanar direction of the bottom end of the positioning support column 13 .

[0118] The steps for testing the wear resistance of a specimen using the wear resistance testing machine of the embodiment of the utility model are as follows:

[0119] S1. Place the sample 100 on the sample placement table 21, with the abraded surface of the sample 100 facing the rotating assembly 3;

[0120] S2. Place the grinding head assembly 5 on the grinding surface of the sample 100;

[0121] 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 is pressed exactly on the ball 52 of the grinding head assembly 5;

[0122] S4. Start the rotation source 41. After the grinding head assembly 5 has pre-grinded for 30 revolutions, stop the machine and measure the initial grinding groove depth h1. Then, every 1000 revolutions of the grinding head assembly 5, stop the machine and measure the grinding groove depth h2.

[0123] S5. The test ends when the rotation speed of the grinding head assembly 5 detected by the rotation speed detection sensor 85 reaches 5000 revolutions or the change in the depth (h2 - h1) of the annular grinding groove 110 detected by the displacement detection component 82 reaches or exceeds 1.5 mm. The test ends when either the rotation speed of the grinding head assembly 5 reaches 5000 revolutions or the change in the depth (h2 - h1) of the annular grinding groove 110 reaches 1.5 mm, whichever comes first.

[0124] Where the embodiments of the present invention contain descriptions involving “first”, “second”, “third”, etc., the descriptions of “first”, “second”, “third”, etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as “first”, “second”, and “third” may explicitly or implicitly include at least one of such features. In addition, the technical solutions of the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0125] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention.

Claims

1. A wear tester for grinding a sample (100) and forming an annular grinding groove (110) on the sample (100), characterized in that: include: A 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 a plurality of balls (52) rollingly connected to the annular support seat (51), and the top wall and the bottom wall of the balls (52) respectively protrude from the annular support seat (51); 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 slideway (33) is provided on the bottom surface of the annular plate (32) along the circumferential direction and is matched with the grinding head assembly (5); A first driving assembly (4) is connected to the rotating assembly (3) and is used to drive the rotating assembly (3) to rotate; The rotating assembly (3) moves up and down relative to the first driving assembly (4); A fixed assembly (1) is rotatably connected to the rotating assembly (3) to limit the rotating assembly (3); the fixed assembly (1) includes a first bearing, a second bearing, and a component for fixing the first bearing and the second bearing, the first bearing being sleeved on the lower end of the rotating shaft (31), and the second bearing being sleeved on the upper end of the rotating shaft (31); the fixed assembly (1) also includes a first fixed plate (11) perpendicular to the axial direction of the rotating shaft (31), the lower surface of the first fixed plate (11) being provided with at least three positioning support columns (13) on the outer side of the rotating shaft (31) and parallel to the axial direction of the rotating shaft (31), the bottom ends of the plurality of positioning support columns (13) being coplanar; A support assembly (2) is used to support a sample (100) and can drive the sample (100) to move up and down; the support assembly (2) includes a sample placement table (21), a second drive assembly (22) connected to the sample placement table (21), and a universal joint (23) between the sample placement table (21) and the second drive assembly (22); and a control unit, electrically connected to the support assembly (2) and the first drive assembly (4), respectively, for controlling the support assembly (2) and the first drive assembly (4) to perform actions; When the second driving assembly (22) operates to drive 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), and 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 table (21), the top wall of the ball (52) is in contact with the annular slideway (33), and the bottom wall of the ball (52) is in contact with the grinding surface of the sample (100).

2. The wear resistance testing machine according to claim 1, characterized in that: The first driving assembly (4) includes a rotation source (41), a driving wheel (42) connected to a driving end of the rotation source (41), a driven wheel (43) connected to the rotation assembly (3), a belt (44) sleeved on the driving wheel (42) and the driven wheel (43), and a first coupling (45) between the rotation assembly (3) and the driven wheel (43); The fixed assembly (1) further comprises a first bearing sleeve (12) arranged on a first fixed plate (11), the first fixed plate (11) is provided with a first through hole, the first bearing sleeve (12) is engaged in the first through hole, the first bearing sleeve (12) is embedded in the first bearing, and the rotating assembly (3) is slidably connected to the inner ring of the first bearing; and further comprises a second fixed plate (14) perpendicular to the axial direction of the rotating shaft (31) and a cylindrical driven wheel support seat (15) fixedly arranged on the second fixed plate (14), the driven wheel (43) is arranged on the upper surface of the driven wheel support seat (15), a second bearing is arranged in the inner cavity of the driven wheel support seat (15), the outer ring of the second bearing is engaged and fixed with the driven wheel support seat (15), and the inner ring of the second bearing is sleeved with the first coupling (45) and rotates synchronously with the first coupling (45).

3. The wear resistance testing machine according to claim 2, characterized in that: A sliding 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 matched with the sliding groove is provided on the other of the side wall (91) of the rotating shaft (31) and the inner side wall (91) of the first coupling (45). The positioning protrusion and the sliding groove are arranged to slide relative to each other, and the rotating shaft (31) moves up and down relative to the first coupling (45).

4. The wear resistance testing machine according to claim 2, characterized in that: The fixed assembly (1) further includes a third fixed plate (16) above the rotation source (41) and a cylindrical driving wheel support seat (17) fixedly arranged on the third fixed plate (16); the driving wheel (42) is arranged on the upper surface of the driving wheel support seat (17); the third fixed plate (16) is provided with a third through hole; a second coupling connected to the driving end of the rotation source (41) is passed through the third through hole and connected to the driving wheel (42); The fixing assembly (1) further comprises a workbench (18) and a vertical fixing plate (19) located on the upper surface of the workbench (18) and perpendicular to the workbench (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 in parallel with each other at intervals; the second fixing plate (14) is located above the first fixing plate (11); the second fixing plate (14) is arranged on one side of the top end of the vertical fixing plate (19); the third fixing plate (16) is arranged on the other side of the top end of the vertical fixing plate (19); the second fixing plate (14) and the third fixing plate (16) are at 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.

5. The wear resistance testing machine according to claim 1, characterized in that: The water supply assembly (6) is also provided at the bottom end of the rotating assembly (3), and the water supply assembly (6) includes a water inlet column (61) fixedly provided 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 provided on the bottom end surface of the water inlet column (61). The inner cavity diameter of the water inlet sleeve (62) is smaller than the diameter of the rotating shaft (31), the upper end surface of the water inlet sleeve (62) is connected to the bottom end surface of the rotating shaft (31), the water inlet sleeve (62) is limited between the rotating shaft (31) and the connecting plate (63), the water inlet column (61) is provided with a water inlet channel communicating with the inner cavity of the water inlet sleeve (62), the circumferential surface of the water inlet sleeve (62) is provided with a radially penetrating connecting hole (621), the penetrating connecting hole (621) is provided with a water inlet joint (64), and the water inlet joint (64) is connected to the water inlet device; A first water outlet hole (631) is provided at the central axis of the connecting plate (63), and the water inlet channel is in communication with the first water outlet hole (631).

6. The wear resistance testing machine according to claim 5, characterized in that: The connecting plate (63) is a stepped first connecting plate (632) and a second connecting plate (633). A transition surface (634) is provided between the first connecting plate (632) and the second connecting plate (633). A circular groove (635) is provided at 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 connected to the top surface of the annular plate (32); The rotating assembly (3) further comprises a mounting plate (34), an annular plate (32) is arranged between the mounting plate (34) and the first connecting plate (632), and the annular plate (32) and the water inlet sleeve (62) are spaced apart.

7. The wear resistance testing machine according to claim 6, characterized in that: The water supply assembly (6) further includes a limiting structure, which limits the rotation of the water inlet sleeve (62) while enabling the water inlet sleeve (62) to be raised and lowered. The limiting structure comprises a limiting column (66) arranged outside the central axis of the upper end surface of the water inlet sleeve (62) and a blocking plate (67) slidably connected to the limiting column (66); a through hole is opened at one end of the blocking plate (67); the limiting column (66) is fitted with a clearance between the through hole and is passed through the through hole of the blocking plate (67); and the other end of the blocking plate (67) is fixedly connected to the fixing assembly (1).

8. The wear resistance testing machine according to claim 1, characterized in that: It also includes a load assembly (7) sleeved on the rotating assembly (3) and used to provide a load to the grinding head assembly (5); The load assembly (7) comprises a load cylinder (71), wherein upper and lower end portions of the load cylinder (71) are provided with an upper groove and a lower groove at the central axis positions thereof, wherein a third bearing (72) is provided in the upper groove, and a fourth bearing (73) is provided in the lower groove, and the rotating assembly (3) is rotatably connected to the third bearing (72) and the fourth bearing (73), respectively; and the middle portion of the rotating shaft (31) is provided with two spaced-apart clamping grooves along the circumferential direction, wherein clamping hoops (74) are respectively provided in the clamping grooves, wherein one clamping hoops (74) is provided on the upper surface of the third bearing (72), and the other clamping hoops (74) is provided on the lower surface of the fourth bearing (73), and the clamping hoops (74) fix the load assembly (7) in the axial direction of the rotating shaft (31).

9. The wear resistance testing machine according to claim 8, characterized in that: Also included is 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 arranged on the circumferential surface of the load cylinder (71), the crossbar (81) is perpendicular to the central axis direction of the load cylinder (71), and the displacement detection component (82) is used to detect the displacement of the crossbar (81); the detection assembly (8) also includes a limit plate (83), the limit plate (83) is fixedly arranged on the end of the first fixed plate (11) and the second fixed plate (14) away from the vertical fixed plate (19), the limit plate (83) is provided with a long strip limit hole (831) along the axial direction parallel to the rotating shaft (31), and the crossbar (81) passes through the limit hole (831); The detection assembly (8) further comprises a rotation detection sensor (85) and a detection column (86) fixedly arranged on one side of the annular support seat (51); the rotation detection sensor (85) is arranged at the same height position outside the annular support seat (51); and the rotation detection sensor (85) is fixedly arranged on the fixed assembly (1).

10. The wear resistance testing machine according to claim 4, characterized in that: It also includes a protective assembly (9) arranged around the working table (18); The protection assembly (9) comprises a side wall (91) and a door (92) movably connected to the side wall (91).

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