Friction and wear testing device for ultralow-temperature self-lubricating bearing

Abstract

The utility model discloses an ultralow-temperature self-lubricating bearing friction and wear testing device, which relates to the technical field of friction and wear testing devices and comprises a ball sample loading and clamping device, a block sample clamping and cooling liquid recycling device, a reciprocating motion device, a supporting and splash-proof device and a liquid nitrogen filling device. The ball block sample can simulate the friction working condition in the bearing (a rolling body and an outer ring); a ball screw is used for loading, the loading force is controllable, and the loading process is simple; the frictional wear test in a reciprocating motion state is realized; liquid nitrogen is used for cooling, and the ultralow-temperature environment in actual work is simulated.

Description

Technical Field

[0001] The utility model relates to the technical field of friction and wear testing devices, in particular to an ultra-low temperature self-lubricating bearing friction and wear testing device. Background Art

[0002] Ultra-low temperature self-lubricating materials have always been a research hotspot in modern science and technology. The research on the friction and wear properties of ultra-low temperature self-lubricating materials is very important. At present, most solid lubricating materials have poor wear resistance in ultra-low temperature environments and it is difficult to maintain high-efficiency working requirements. Self-lubricating bearings are widely used in aerospace, satellites and other ultra-low temperature working conditions. The harsh working environment places high demands on the anti-wear and friction reduction properties of self-lubricating bearings. Therefore, it is of great research significance to study the friction performance of self-lubricating materials under ultra-low temperature conditions.

[0003] Many scholars have devoted themselves to the research of ultra-low temperature processing of workpieces. The current common ultra-low temperature processing devices usually use internal closed environment for cooling treatment. There are many related patents, but there are inevitably some problems. For example, application numbers 201029012022.4 and 202010756009.0 both perform cooling treatment internally, and too many materials are used, which is complicated to replace and the data measurement of the test machine body in an ultra-low temperature environment is distorted. There are few patents on external ultra-low temperature cooling. In order to accurately simulate the ultra-low temperature liquid nitrogen cooling of workpieces in external conditions, this application designs a device that can perform ultra-low temperature cooling under external conditions. Real-time detection of load, friction and temperature of self-lubricating material friction pairs under ultra-low temperature conditions is realized. Utility Model Content

[0004] The utility model aims to provide a friction and wear testing device for ultra-low temperature self-lubricating bearings to solve the above-mentioned defects caused by the prior art.

[0005] A device for testing friction and wear of ultra-low temperature self-lubricating bearings, including loading and clamping of ball specimens, clamping of block specimens and recovery of coolant, a reciprocating motion device, a supporting and splash-proof device and a liquid nitrogen filling device, wherein the loading and clamping of the ball specimens include a heat insulation board, a hexagon socket head screw, a ball screw, a coupling, a brake motor, a bracket rod, a screw 1, a hexagon head bolt, a ball specimen fixture, a guide rail slider, a hexagon socket head screw, a three-axis force sensor mounting platform, a linear guide rail, a screw 3, a ball specimen and a three-axis force sensor, wherein the bracket rod is fixed to a table by screw 3 for fixing and supporting, the linear guide rail is fixed to the front of the bracket rod by the hexagon socket head screw, the brake motor is fixed to the front of the bracket rod by screw 1, the guide rail slider is mounted on the ball screw, and the ball screw is connected to the table by the coupling The shaft is connected to the brake motor, and the linear guide fixes the direction of the ball screw through the hole at the upper end and the groove at the lower end, so that the ball screw is vertical. The guide slider is connected to the linear guide, and the guide slider can slide up and down through the groove inside the linear guide. The three-axis force sensor mounting platform is fixed to the guide slider through a hexagonal head bolt, and the ball sample is fixed in the ball sample fixture through an internal hexagonal cylindrical head screw. The three-axis force sensor is installed at the upper end of the insulation board and at the lower end of the three-axis force sensor mounting platform. At the same time, the three-axis force sensor can detect the load and friction of the self-lubricating material friction pair under ultra-low temperature conditions in real time. When the brake motor is started, the ball screw rotates to control the guide slider to move up and down. When the ball sample is in close contact with the block sample, the brake motor stops, the ball screw stops, and self-locking is achieved.

[0006] Preferably, the clamping of the block sample and the recovery of the coolant include a sample, a collecting device, a cooling box, a right-angle pad, a block sample position adjustment screw, a nut 3, a screw 7, and a temperature sensor. The sample is fixed in the cooling box by the block sample position adjustment screw and the right-angle pad. The block sample position adjustment screw can control the front, back, left, and right positions of the sample in the cooling box by adjusting the depth. The cooling box can be connected to the reciprocating connecting rod through the screw 7 and the nut 3, and the cooling box itself is connected to the collecting device through a pipeline. The temperature sensor is inserted into the sample and placed in the cooling box. During processing, excess liquid nitrogen flows into the collecting device through the reserved hole of the cooling box to realize the treatment and recovery of waste liquid. At the same time, the temperature sensor can detect the temperature of the self-lubricating material under ultra-low temperature conditions in real time.

[0007] Preferably, the reciprocating motion device includes a linear reciprocating motor, a housing, a screw 4, a nut 1, a screw 5, a connecting rod base, a stud, a nut 2, a reciprocating connecting rod, and a circular connecting rod. The reciprocating connecting rod is fixed to the connecting rod by the stud and the nut 2. The middle part of the connecting rod is connected to the linear reciprocating motor by the stud and the nut 2. The lower end of the connecting rod is connected to the connecting rod base by the nut 1 and the screw 5. The linear reciprocating motor is connected to the housing by the screw 4. The connecting rod base and the housing are fixed by a groove. The linear reciprocating motor pushes the connecting rod, and uses a small displacement to drive the reciprocating connecting rod to move a large distance, so that the reciprocating connecting rod performs a reciprocating motion. The reciprocating connecting rod controls its lateral movement through a lateral guide. The overall structure of the reciprocating motion device is simple, and parts can be easily replaced.

[0008] Preferably, the support and splash-proof device includes a screw 2, a liquid nitrogen tube bracket, a table, a transverse guide, a gasket, a screw 6, and an observation glass window. The transverse guide is fixed to the table through a gasket and a screw 6. The observation glass window is inserted into the table through a groove on the table. The liquid nitrogen tube bracket is fixed to the table through a screw 2. The transverse guide supports and guides the reciprocating connecting rod. The table has a raised portion that can accommodate the collection device. The liquid nitrogen tube bracket supports the spray bottle tube. The observation glass window can slide through the groove on the table for easy storage and use, and also plays a role in splash-proof protection.

[0009] Preferably, the liquid nitrogen filling device includes a nozzle, a spray bottle tube, a rivet, a universal wheel, a universal wheel bracket, a liquid nitrogen tank, and a screw 8. The nozzle is connected to the spray bottle tube, the spray bottle tube is connected to the upper end of the liquid nitrogen tank, the universal wheel is connected to the universal wheel bracket through a rivet, the universal wheel bracket is connected to the lower end of the liquid nitrogen tank through a screw 8, and a universal wheel is installed under the liquid nitrogen tank, so that the liquid nitrogen tank can be easily moved. The spray bottle tube at the upper end of the liquid nitrogen tank is in contact with the liquid nitrogen tube bracket, and the liquid nitrogen tube bracket can control the height of the spray bottle tube. The liquid nitrogen tank contains a pressure sensor to help the user determine whether liquid nitrogen needs to be added.

[0010] The advantages of the utility model are:

[0011] The ball block specimen can simulate the friction conditions inside the bearing (rolling elements and outer ring);

[0012] Using ball screw for loading, the loading force is controllable and the loading process is simple;

[0013] Realize friction and wear testing under reciprocating motion;

[0014] Use liquid nitrogen for cooling to simulate the ultra-low temperature environment in actual work. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall device of the utility model.

[0016] Figure 2 It is a schematic diagram of loading and clamping of the ball sample in the utility model.

[0017] Figure 3 The utility model is used for clamping the block sample and recovering the coolant.

[0018] Figure 4 It is a schematic diagram of the reciprocating motion device in the utility model.

[0019] Figure 5 It is a schematic diagram of the support and splash-proof device in the utility model.

[0020] Figure 6 It is a schematic diagram of the liquid nitrogen filling device in the utility model.

[0021] Among them: 1. Heat insulation board, 2. Hexagon socket head screw, 3. Ball screw, 4. Coupling, 5. Brake motor, 6. Bracket rod, 7. Screw 1, 8. Hexagon head bolt, 9. Ball sample fixture, 10. Guide rail slider, 11. Hexagon socket head screw, 12. Three-axis force sensor mounting platform, 13. Linear guide, 14. Nozzle, 15. Sample, 16. Spray bottle tube, 17. Screw 2, 18. Liquid nitrogen tube bracket, 19. Collection device, 20. Screw 3, 21. Cooling box, 22. Right-angle pad, 23. Block sample position adjustment screw Nail, 24, rivet, 25, table, 26, universal wheel, 27, universal wheel bracket, 28, liquid nitrogen tank, 29, linear reciprocating motor, 30, housing, 31, screw 4, 32, nut 1, 33, screw 5, 34, connecting rod base, 35, stud, 36, nut 2, 37, lateral guide, 38, gasket, 39, reciprocating connecting rod, 40, connecting rod, 41, screw 6, 42, ball specimen, 43, triaxial force sensor, 44, observation glass window, 45, nut 3, 46, screw 7, 47, temperature sensor, 48, screw 8. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] like Figures 1 to 6As shown, a friction and wear testing device for ultra-low temperature self-lubricating bearings includes a ball sample loading and clamping, a block sample clamping and coolant recovery, a reciprocating motion device, a support and splash-proof device and a liquid nitrogen filling device. The ball sample loading and clamping includes a heat insulation board 1, a hexagon socket cylindrical head screw 2, a ball screw 3, a coupling 4, a brake motor 5, a support rod 6, a screw 17, a hexagonal head bolt 8, a ball sample fixture 9, a guide rail slider 10, a hexagon socket cylindrical head screw 11, a three-axis force sensor mounting platform 12, a linear guide 13, a screw 320, a ball sample 42, and a three-axis force sensor 43. The support rod 6 is fixed to the table 25 by the screw 320 to play the function of fixing and supporting. The linear guide 13 is fixed to the support rod 6 by the hexagon socket cylindrical head screw 2. The brake motor 5 is fixed to the support rod 6 by the screw 17. The guide rail slider 10 is installed on the ball screw 3. The ball screw 3 is fixed to the table 25 by the screw 320. The coupling 4 is connected to the brake motor 5, and the linear guide 13 fixes the direction of the ball screw 3 through the hole at the upper end and the groove at the lower end, so that the ball screw 3 is vertical. The guide slider 10 is connected to the linear guide 13, and the guide slider 10 can slide up and down through the groove inside the linear guide 13. The three-axis force sensor mounting platform 12 is fixed to the guide slider 10 through the hexagonal head bolt 8, and the ball sample 42 is fixed in the ball sample fixture 9 through the hexagonal cylindrical head screw 11. The three-axis force sensor 43 is installed on the upper end of the insulation board 1 and at the lower end of the three-axis force sensor mounting platform 12. At the same time, the three-axis force sensor 43 can detect the load and friction of the self-lubricating material friction pair under ultra-low temperature conditions in real time. When the brake motor 5 is started, the ball screw 3 rotates to control the guide slider 10 to move up and down. When the ball sample 42 is in close contact with the block sample 15, the brake motor 5 stops, the ball screw 3 is stationary, and self-locking is achieved. The overall structure of ball specimen loading and clamping is simple, and parts replacement is convenient.

[0024] In this embodiment, the block sample clamping and coolant recovery include a block sample 15, a collecting device 19, a cooling box 21, a right-angle pad 22, a block sample position adjustment screw 23, a nut 345, a screw 746, and a temperature sensor 47. The block sample 15 is fixed in the cooling box 21 by the block sample position adjustment screw 23 and the right-angle pad 22. The block sample position adjustment screw 23 can control the front, back, left, and right positions of the block sample 15 in the cooling box 21 by adjusting the depth. The cooling box 21 can be connected to the reciprocating connecting rod 39 by screws 746 and nuts 345, and the cooling box 21 itself is connected to the collecting device 19 by a pipeline. The temperature sensor 47 is inserted into the block sample 15 and placed in the cooling box 21. During processing, excess liquid nitrogen flows into the collecting device 19 through the reserved hole of the cooling box 21 to realize the treatment and recovery of waste liquid. At the same time, the temperature sensor 47 can detect the temperature of the self-lubricating material under ultra-low temperature conditions in real time. The overall structure of the block sample clamping and coolant recovery is simple, which is convenient for parts replacement.

[0025] It should be noted that the reciprocating motion device includes a linear reciprocating motor 29, a housing 30, a screw 431, a nut 132, a screw 533, a connecting rod base 34, a stud 35, a nut 236, a reciprocating connecting rod 39, and a connecting rod 40. The reciprocating connecting rod 39 is fixed to the connecting rod 40 through the stud 35 and the nut 236. The middle part of the connecting rod 40 is connected to the linear reciprocating motor 29 through the stud 35 and the nut 236. The lower end of the connecting rod 40 is connected to the connecting rod base 34 through the nut 132 and the screw 533. The linear reciprocating motor 29 is connected to the housing 30 through the screw 431. The connecting rod base 34 and the housing 30 are fixed through a groove. The linear reciprocating motor 29 pushes the connecting rod 40, and uses a small displacement to drive the reciprocating connecting rod 39 to move a large distance, so that the reciprocating connecting rod 39 performs a reciprocating motion. The reciprocating connecting rod 39 controls its lateral movement through the lateral guide 37. The overall structure of the reciprocating motion device is simple, and parts can be easily replaced.

[0026] In this embodiment, the support and splash-proof device includes screws 217, a liquid nitrogen tube bracket 18, a table 25, a transverse guide 37, a gasket 38, a screw 641, and an observation glass window 44. The transverse guide 37 is fixed to the table 25 by the gasket 38 and the screw 641. The observation glass window 44 is inserted into the table 25 through the groove on the desktop. The liquid nitrogen tube bracket 18 is fixed to the table 25 by the screw 217. The transverse guide 37 supports and guides the reciprocating connecting rod 39. The observation glass window 44 plays a role of splash-proof protection. The table 25 has a raised portion that can hold the collection device 19. The liquid nitrogen tube bracket 18 also supports the spray bottle tube 16. The observation glass window 44 can slide through the groove on the table, which is convenient for storage and use, and also plays a role of splash-proof protection. The overall structure of the support and splash-proof device is simple, and parts can be easily replaced.

[0027] In this embodiment, the liquid nitrogen filling device includes a nozzle 14, a spray bottle tube 16, a rivet 24, a universal wheel 26, a universal wheel bracket 27, a liquid nitrogen tank 28, and a screw 848. The nozzle 14 is connected to the spray bottle tube 16, the spray bottle tube 16 is connected to the liquid nitrogen tank 28, the universal wheel 26 is connected to the universal wheel bracket 27 through the rivet 24, the universal wheel bracket 27 is connected to the liquid nitrogen tank 28 through the screw 848, and a universal wheel is installed under the liquid nitrogen tank 28, so that the liquid nitrogen tank 28 can be easily moved. The spray bottle tube 16 at the upper end of the liquid nitrogen tank 28 is in contact with the liquid nitrogen tube bracket 18, and the liquid nitrogen tube bracket 18 can control the height of the spray bottle tube 16. The liquid nitrogen tank 28 contains a pressure sensor to help the user determine whether liquid nitrogen needs to be added.

[0028] Based on the above, the utility model realizes:

[0029] The ball block specimen can simulate the friction conditions inside the bearing (rolling elements and outer ring);

[0030] By using ball screw, the loading force is controllable and the loading process is simple;

[0031] Realize friction and wear testing under reciprocating motion;

[0032] Use liquid nitrogen for cooling to simulate the ultra-low temperature environment in actual work.

[0033] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. An ultra-low temperature self-lubricating bearing friction and wear testing device, characterized in that: The invention comprises a ball sample loading and clamping device, a block sample clamping device and a coolant recovery device, a reciprocating motion device, a support and splash-proof device and a liquid nitrogen filling device, wherein the ball sample loading and clamping device comprises a heat insulation plate (1), a hexagon socket head screw (2), a ball screw (3), a coupling (4), a brake motor (5), a support rod (6), a screw 1 (7), a hexagon head bolt (8), a ball sample fixture (9), a guide rail slider (10), a hexagon socket head screw (11), a three-axis force sensor The device comprises a mounting platform (12), a linear guide rail (13), a screw 3 (20), a ball sample (42), and a triaxial force sensor (43). The support rod (6) is fixed to the table (25) by the screw 3 (20) to fix and support it. The linear guide rail (13) is fixed to the support rod (6) by the hexagon socket head screw (2). The brake motor (5) is fixed to the support rod (6) by the screw 1 (7). The guide rail slider (10) is installed on the ball screw (3). The ball screw (3 ) passes through the upper end of the linear guide rail (13) and is connected to the brake motor (5) through the coupling (4). The linear guide rail (13) fixes the direction of the ball screw (3) through the hole at the upper end and the groove at the lower end, so that the ball screw (3) is vertical. The guide slider (10) is connected to the linear guide rail (13). The guide slider (10) can slide up and down through the groove inside the linear guide rail (13). The three-axis force sensor mounting platform (12) is fixed to the guide slider (10) through the hexagonal bolt (8). The ball sample (42) is fixed in the ball sample fixture (9) by means of a hexagon socket head screw (11). The triaxial force sensor (43) is installed on the upper end of the heat insulation board (1) and at the lower end of the triaxial force sensor mounting platform (12). When the brake motor (5) is started, the ball screw (3) rotates to control the guide rail slider (10) to move up and down. When the ball sample (42) is in close contact with the block sample (15), the brake motor (5) stops rotating and the ball screw (3) stops moving, thereby achieving self-locking.

2. The ultra-low temperature self-lubricating bearing friction and wear testing device according to claim 1, characterized in that: The clamping of the block sample and the recovery of the coolant include a block sample (15), a collecting device (19), a cooling box (21), a right-angle pad (22), a block sample position adjustment screw (23), a nut 3 (45), a screw 7 (46), and a temperature sensor (47). The block sample (15) is fixed in the cooling box (21) by the block sample position adjustment screw (23) and the right-angle pad (22). The block sample position adjustment screw (23) can control the front, back, left, and right positions of the block sample (15) in the cooling box (21) by adjusting the depth. The cooling box (21) is connected to the reciprocating connecting rod (39) by the screw 7 (46) and the nut 3 (45). The cooling box (21) is connected to the collecting device (19) by a pipeline. The temperature sensor (47) is inserted into the block sample (15) and placed in the cooling box (21). During processing, excess liquid nitrogen flows into the collecting device (19) through the reserved hole of the cooling box (21).

3. The ultra-low temperature self-lubricating bearing friction and wear testing device according to claim 1, characterized in that: The reciprocating motion device comprises a linear reciprocating motor (29), a housing (30), a screw 4 (31), a nut 1 (32), a screw 5 (33), a connecting rod base (34), a stud (35), a nut 2 (36), a reciprocating connecting rod (39), and a connecting rod (40). The reciprocating connecting rod (39) is fixed to the connecting rod (40) via the stud (35) and the nut 2 (36). The middle part of the connecting rod (40) is connected to the linear reciprocating motor (29) via the stud (35) and the nut 2 (36). The lower end of the connecting rod (40) is connected to the connecting rod base (34) through a nut 1 (32) and a screw 5 (33), the linear reciprocating motor (29) is connected to the housing (30) through a screw 4 (31), the connecting rod base (34) and the housing (30) are fixed through a groove, the linear reciprocating motor (29) pushes the connecting rod (40), uses a small displacement to drive the reciprocating connecting rod (39) to move a large distance, so that the reciprocating connecting rod (39) performs a reciprocating motion, and the reciprocating connecting rod (39) controls its lateral movement through a lateral guide (37).

4. The ultra-low temperature self-lubricating bearing friction and wear testing device according to claim 2, characterized in that: The support and splash-proof device comprises a screw 2 (17), a liquid nitrogen tube support (18), a table (25), a transverse guide (37), a gasket (38), a screw 6 (41), and an observation glass window (44). The transverse guide (37) is fixed to the table (25) by means of the gasket (38) and the screw 6 (41). The observation glass window (44) is inserted into the table (25) through a groove on the table. The liquid nitrogen tube support (18) is fixed to the table (25) by means of the screw 2 (17). The transverse guide (37) supports and guides the reciprocating connecting rod (39). The observation glass window (44) plays a role of splash-proof protection. The table (25) has a raised portion for holding the collecting device (19). The liquid nitrogen tube support (18) plays a supporting role for the spray bottle tube (16).

5. The ultra-low temperature self-lubricating bearing friction and wear testing device according to claim 2, characterized in that: The liquid nitrogen filling device comprises a nozzle (14), a spray bottle pipe (16), a rivet (24), a universal wheel (26), a universal wheel bracket (27), a liquid nitrogen tank (28), and a screw 8 (48). The nozzle (14) is connected to the spray bottle pipe (16), the spray bottle pipe (16) is connected to the liquid nitrogen tank (28), the universal wheel (26) is connected to the universal wheel bracket (27) through the rivet (24), the universal wheel bracket (27) is connected to the liquid nitrogen tank (28) through the screw 8 (48), a universal wheel is arranged below the liquid nitrogen tank (28), and the liquid nitrogen tank (28) can be easily moved, the spray bottle pipe (16) at the upper end of the liquid nitrogen tank (28) is in contact with the liquid nitrogen pipe bracket (18), and the liquid nitrogen pipe bracket (18) can control the height of the spray bottle pipe (16).

Images