Intermittent friction and wear test device

Abstract

The application discloses an intermittent friction and wear test device, which comprises a driving device, a transmission device, an intermittent device and a test loading device, wherein the driving device, the transmission device, the intermittent device and the test loading device are arranged in a "one" shape, the output shaft of the driving device is connected with the input shaft of the transmission device, the intermittent device is provided with an incomplete gear, a lower gear rack and an upper gear rack, the incomplete gear is connected with the output shaft of the transmission device, and the output shaft of the intermittent device is connected with the input shaft of the test loading device. The intermittent friction and wear test device adopts the incomplete gear mechanism to realize intermittent start and stop of the wind power yaw bearing, simulates the working condition of reciprocating swing, selects the gear and rack parts with high transmission efficiency on the transmission mechanism to reduce the energy loss in the transmission process, designs the bearing shaft section and the shaft shoulder as separate bearing pad parts, and the axial bearing pad is circumferentially positioned on the bearing shaft through a sliding key, axial displacement is allowed, and the bearing shaft can be prevented from being pulled.

Description

Technical Field

[0001] This invention belongs to the technical field of wind turbine yaw bearing wear testing equipment, specifically relating to an intermittent friction and wear testing device. Background Technology

[0002] Bearings, as one of the core components of wind turbine generators, significantly impact the start-up, shutdown, and stable operation of wind turbines, making them a key element in ensuring the stability and reliability of wind turbine generators. The yaw bearing connects the wind turbine tower and the nacelle, its function being to drive the nacelle to rotate under the influence of the yaw motor, ensuring the nacelle's orientation aligns with the wind direction to improve the overall efficiency of wind energy utilization. Yaw bearings require excellent load-bearing capacity, capable of simultaneously withstanding large axial loads, radial loads, and overturning moments. Most existing yaw bearings are rolling bearings, commonly used in low-to-medium power wind turbine models. With the increasing market demand for high-power wind turbine models, rolling bearings have revealed limitations in terms of size, performance, and manufacturing costs. Against this backdrop, the industry is attempting to replace rolling bearings with sliding bearings, which offer better stability, superior impurity tolerance, and lower processing costs. Designing and manufacturing yaw bearings using sliding bearings presents several challenges: the bearing operates at extremely low speeds, undergoes reciprocating motion, and frequently starts and stops. These operating conditions place stringent requirements on the bearing materials and lubrication of sliding bearings. Consequently, new design requirements have arisen for testing devices used to assess the friction and wear properties of these materials. Traditional friction and wear testing devices primarily conduct material property tests by altering the load and relative speed between friction pairs, lacking designs for rest ratios and reciprocating motion. Therefore, it is essential to design a targeted intermittent friction and wear testing device. Summary of the Invention

[0003] The purpose of this invention is to provide an intermittent friction and wear testing device, which solves the problems of traditional wear testing devices lacking a stop-start ratio and reciprocating motion.

[0004] The technical solution adopted in this invention is an intermittent friction and wear testing device, including a driving device, a transmission device, an intermittent device, and a test loading device. The driving device, transmission device, intermittent device, and test loading device are arranged in a straight line. The output shaft of the driving device is connected to the input shaft of the transmission device. The intermittent device is provided with an incomplete gear, a lower rack, and an upper rack. The incomplete gear is connected to the output shaft of the transmission device, and the output shaft of the intermittent device is connected to the input shaft of the test loading device.

[0005] The invention is further characterized by:

[0006] The drive unit includes a three-phase asynchronous motor, and the output shaft of the three-phase asynchronous motor is fixedly connected to a first coupling;

[0007] The lower part of the three-phase asynchronous motor is fixed with a motor base;

[0008] The transmission device includes a gear reducer, a second coupling that mates with the first coupling is fixedly connected to one side of the gear reducer, and a third coupling is fixedly connected to the other side of the gear reducer.

[0009] A gearbox base is fixedly connected to the lower part of the gear reducer.

[0010] The intermittent device includes a sliding guide rail, which is horizontally set. A first guide rail bracket and a second guide rail bracket are slidably connected on the sliding guide rail. A rack mounting bracket is fixedly connected to the upper part of the first guide rail bracket and the second guide rail bracket. The longitudinal section of the rack mounting bracket is a horizontally placed "P" shape. A lower rack and an upper rack are horizontally installed inside the rack mounting bracket in the corresponding section of the first guide rail bracket. Both the lower rack and the upper rack are parallel to the sliding guide rail. A straight rack is horizontally installed outside the rack mounting bracket in the corresponding section of the second guide rail bracket. The straight rack is parallel to the sliding guide rail.

[0011] It also includes two first bearing seats and two second bearing seats. The sliding guide rail passes through the two first bearing seats and the two second bearing seats respectively. An intermittent shaft is provided between the two first bearing seats in a direction perpendicular to the sliding guide rail. An incomplete gear is sleeved on the outside of the intermittent shaft. The incomplete gear meshes with the lower rack and the upper rack respectively. A transmission shaft is provided between the two second bearing seats in a direction perpendicular to the sliding guide rail. A spur gear is sleeved on the outside of the transmission shaft. The spur gear meshes with the spur rack.

[0012] A fourth coupling that mates with the third coupling is fixed to the side of the first bearing housing. The center of the fourth coupling is on the axis of the intermittent shaft.

[0013] The fifth coupling is fixed to the side of the second bearing housing, and the center of the fifth coupling is on the axis of the transmission shaft.

[0014] The test loading device includes a torque measuring mechanism, which is bolted to the loading mechanism;

[0015] The torque measuring mechanism includes a torque sensor, a sixth coupling that mates with the fifth coupling is fixedly connected to one side of the torque sensor, and a seventh coupling is fixedly connected to the other side of the torque sensor.

[0016] A sensor base is fixedly attached to the lower part of the torque sensor;

[0017] The loading mechanism includes a bearing shaft. One end of the bearing shaft is fixedly connected to an eighth coupling that mates with a seventh coupling. The other end of the bearing shaft is fixedly connected to a second pressure sensor. Along the direction from the eighth coupling to the axial mounting bracket, the bearing shaft is sequentially fitted with a third bearing housing, a radial loading mechanism, a fourth bearing housing, an electromagnetic mounting bracket, and an axial mounting bracket. A first deep groove ball bearing is fitted onto the bearing shaft at the corresponding position on the third bearing housing, and the first deep groove ball bearing is fixedly connected inside the third bearing housing. A second deep groove ball bearing is fitted onto the bearing shaft at the corresponding position on the fourth bearing housing, and the second deep groove ball bearing is fixedly connected... Inside the fourth bearing housing, a second thrust ball bearing is sleeved on the bearing shaft at the corresponding position of the electromagnetic mounting bracket. The second thrust ball bearing is fixed inside the electromagnetic mounting bracket. An electromagnetic actuator is sleeved on the bearing shaft and fixed to the side of the electromagnetic mounting bracket near the fourth bearing housing. An axial loading pad and an axial bearing pad are sequentially sleeved on the bearing shaft from the electromagnetic mounting bracket to the axial mounting bracket. A guide key is provided between the axial loading pad and the bearing shaft. The second pressure sensor is fixed inside the axial mounting bracket. A cover is installed on the side of the axial mounting bracket away from the electromagnetic mounting bracket.

[0018] The radial loading mechanism includes a radial bearing pad, which is sleeved on the bearing shaft, and a radial loading pad is sleeved on the outside of the radial bearing pad;

[0019] It also includes a radial loading tile bracket, with a piezoelectric actuator mounting plate fixedly connected to the upper part of the radial loading tile bracket. The piezoelectric actuator mounting plate and the radial loading tile bracket have corresponding vertical through holes. A screw cap is installed in the through hole. A first thrust ball bearing is connected below the screw cap. An upper abutment plate is connected to the lower part of the first thrust ball bearing. A piezoelectric actuator is connected to the lower end face of the upper abutment plate. A lower support plate is connected to the lower end of the piezoelectric actuator. The lower support plate is slidably connected to the inner side of the radial loading tile bracket. A first pressure sensor is fixedly connected to the lower end face of the lower support plate. The first pressure sensor is in contact with the radial loading tile.

[0020] The beneficial effects of this invention are:

[0021] This invention provides an intermittent friction and wear testing device. It employs an incomplete gear mechanism to simulate the intermittent start-stop and reciprocating oscillation of a wind turbine yaw bearing. High-efficiency gear and rack components are selected for the transmission mechanism to reduce energy loss during transmission. The bearing shaft section and shaft shoulder are designed as separate bearing bush components, and the axial bearing bush is circumferentially positioned on the bearing shaft via a sliding key, allowing axial displacement. This avoids tension on the bearing shaft, reducing the strength requirements to some extent, and ensures that the radial load is fully applied to the radial bearing bush, obtaining a more accurate specific pressure value. It is used for... The radially loaded piezoelectric actuator employs a ball-head structure, which helps to reduce the impact of actuator installation errors and structural vibrations on loading accuracy. Using an electromagnetic actuator as the axial loading device enables non-contact axial force loading, making the actuator itself unaffected by frictional torque and vibration of moving parts, thus extending its service life. Separate bearing parts are designed for load-bearing conditions, allowing for quick disassembly and replacement when parts wear and fail, eliminating the need to re-fabricate large components and saving testing costs. Furthermore, bearing parts with different surface materials and processes can be used for performance testing, making the test device more versatile. The overall structure of this test device is simple, easy to install, debug, maintain, and repair, and economical. It has significant positive implications for the subsequent development of yaw bearings in the form of sliding bearings, the research and development of corresponding lubrication technologies, and further improvement of the service life and overall reliability of mechanical equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the intermittent friction and wear testing device of the present invention;

[0023] Figure 2 This is a structural diagram of the drive device of the intermittent friction and wear testing device of the present invention;

[0024] Figure 3 This is a structural diagram of the transmission device of the intermittent friction and wear testing device of the present invention;

[0025] Figure 4 This is a structural diagram of the intermittent device of the intermittent friction and wear testing apparatus of the present invention;

[0026] Figure 5 This is a cross-sectional view of the intermittent device of the intermittent friction and wear testing apparatus of the present invention;

[0027] Figure 6 This is a structural diagram of the loading device of the intermittent friction and wear testing apparatus of the present invention;

[0028] Figure 7 This is a partial cross-sectional view of the loading device of the intermittent friction and wear testing apparatus of the present invention;

[0029] Figure 8This is a structural diagram of the torque measuring mechanism of the intermittent friction and wear testing device of the present invention;

[0030] Figure 9 This is a structural diagram of the loading mechanism of the intermittent friction and wear testing device of the present invention;

[0031] Figure 10 This is a structural diagram of the radial loading mechanism of the intermittent friction and wear testing device of the present invention;

[0032] In the diagram, 1. Three-phase asynchronous motor, 2. Motor base, 3. First coupling, 4. Second coupling, 5. Gear reducer, 6. Gearbox base, 7. Third coupling, 8. Fourth coupling, 9. First bearing housing, 10. Second bearing housing, 11. Fifth coupling, 12. Sliding guide rail, 13. First guide rail bracket, 14. Lower rack, 15. Rack mounting bracket, 16. Incomplete gear, 17. Intermittent shaft, 18. Upper rack, 19. Spur gear, 20. Drive shaft, 21. Spur rack, 22. Second guide rail bracket, 23. Sixth coupling, 24. Sensor base, 25. Torque sensor, 26. Seventh coupling, 27. Eighth coupling, 28. Third bearing housing, 29. Tightening cap, 30. Piezoelectric actuator mounting. 31. Radial loading pad bracket, 32. Fourth bearing housing, 33. Electromagnetic mounting bracket, 34. Axial loading pad, 35. Axial bearing pad, 36. Axial mounting bracket, 37. Plate cover, 38. First deep groove ball bearing, 39. Bearing shaft, 40. First thrust ball bearing, 41. Upper abutment plate, 42. Piezoelectric actuator, 43. Lower support plate, 44. First pressure sensor, 45. Radial loading pad, 46. Radial bearing pad, 47. Second deep groove ball bearing, 48. Electromagnetic actuator, 49. Second thrust ball bearing, 50. Guide key, 51. Second pressure sensor, 52. Drive device, 53. Transmission device, 54. Intermittent device, 55. Test loading device, 56. Torque measuring mechanism, 57. Loading mechanism, 58. Radial loading mechanism. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0034] This invention provides an intermittent friction and wear testing device, such as... Figure 1 As shown, it includes a drive device 52, a transmission device 53, an intermittent device 54, and a test loading device 55. The drive device 52, transmission device 53, intermittent device 54, and test loading device 55 are arranged in a straight line. The output shaft of the drive device 52 is connected to the input shaft of the transmission device 53. The intermittent device 54 is provided with an incomplete gear 16, a lower rack 14, and an upper rack 18. The incomplete gear 16 is connected to the output shaft of the transmission device 53, and the output shaft of the intermittent device 54 is connected to the input shaft of the test loading device 55.

[0035] The drive unit 52 is bolted to the transmission unit 53, which is bolted to the intermittent device 54. The intermittent device 54 is equipped with an incomplete gear 16, a lower rack 14 and an upper rack 18. The incomplete gear 16 is connected to the transmission unit 53 via a shaft. The intermittent device 54 is bolted to the test loading device 55. The drive unit 52, transmission unit 53, intermittent device 54 and test loading device 55 are arranged in a straight line.

[0036] like Figure 2 As shown, the drive device 52 includes a three-phase asynchronous motor 1, the output shaft of the three-phase asynchronous motor 1 is fixedly connected to a first coupling 3, and the lower part of the three-phase asynchronous motor 1 is fixedly connected to a motor base 2, which can be directly fixed to the experimental table through the motor base 2.

[0037] like Figure 3 As shown, the transmission device 53 includes a gear reducer 5, a second coupling 4 that cooperates with the first coupling 3 is fixedly connected to one side of the gear reducer 5, a third coupling 7 is fixedly connected to the other side of the gear reducer 5, and a gearbox base 6 is fixedly connected to the lower part of the gear reducer 5, which can be fixed to the experimental table through the gearbox base 6.

[0038] like Figure 4 As shown, the intermittent device 54 includes a sliding guide rail 12, which is horizontally arranged. A first guide rail bracket 13 and a second guide rail bracket 22 are slidably connected to the sliding guide rail 12. A rack mounting bracket 15 is fixedly connected to the upper part of the first guide rail bracket 13 and the second guide rail bracket 22. The rack mounting bracket 15 has a horizontally placed "P" shape in its longitudinal section. A lower rack 14 and an upper rack 18 are horizontally installed inside the corresponding section of the first guide rail bracket 13 on the rack mounting bracket 15. 4 is located inside the lower part of the rack mounting bracket 15, and the upper rack 18 is located inside the upper part of the rack mounting bracket 15. The lower rack 14 and the upper rack 18 are fixed by the rack mounting bracket 15. Both the lower rack 14 and the upper rack 18 are arranged parallel to the sliding guide rail 12. A straight rack 21 is horizontally installed outside the corresponding section of the second guide rail bracket 22 on the rack mounting bracket 15. The straight rack 21 is arranged parallel to the sliding guide rail 12 and is fixed by the rack mounting bracket 15.

[0039] like Figure 5As shown, it also includes two first bearing seats 9 and two second bearing seats 10. A sliding guide rail 12 passes through the two first bearing seats 9 and the two second bearing seats 10 respectively. An intermittent shaft 17 is provided between the two first bearing seats 9 in a direction perpendicular to the sliding guide rail 12. An incomplete gear 16 is sleeved on the outside of the intermittent shaft 17. The incomplete gear 16 meshes with the lower rack 14 and the upper rack 18 respectively. A transmission shaft 20 is provided between the two second bearing seats 10 in a direction perpendicular to the sliding guide rail 12. A spur gear 19 is sleeved on the outside of the transmission shaft 20. The spur gear 19 meshes with the spur rack 21. When the intermittent shaft 17 rotates, the incomplete gear 16 meshes with the lower rack 14 and the upper rack 18, converting it into the lateral intermittent motion of the spur rack 21. Then, the spur rack 21 meshes with the spur gear 19, converting it into the circumferential intermittent reciprocating motion of the transmission shaft 20. The first bearing housing 9 has a fourth coupling 8 fixedly connected to its side, which cooperates with the third coupling 7. The center of the fourth coupling 8 is on the axis of the intermittent shaft 17. The second bearing housing 10 has a fifth coupling 11 fixedly connected to its side. The center of the fifth coupling 11 is on the axis of the transmission shaft 20.

[0040] like Figure 6 As shown, the test loading device 55 includes a torque measuring mechanism 56, which is bolted to a loading mechanism 57.

[0041] like Figure 7 As shown, the torque measuring mechanism 56 includes a torque sensor 25. A sixth coupling 23 that cooperates with the fifth coupling 11 is fixedly connected to one side of the torque sensor 25, and a seventh coupling 26 is fixedly connected to the other side of the torque sensor 25. A sensor base 24 is fixedly connected to the lower part of the torque sensor 25, and the sensor base 24 is fixed to the test bench.

[0042] The loading mechanism 57 includes a bearing shaft 39. One end of the bearing shaft 39 is fixedly connected to an eighth coupling 27 that mates with a seventh coupling 26, and the other end of the bearing shaft 39 is fixedly connected to a second pressure sensor 51. Along the direction from the eighth coupling 27 to the axial mounting bracket 36, the bearing shaft 39 is sequentially equipped with a third bearing housing 28, a radial loading mechanism 58, a fourth bearing housing 32, an electromagnetic mounting bracket 33, and an axial mounting bracket 36. A first deep groove ball bearing 38 is sleeved on the bearing shaft 39 at the corresponding position of the third bearing housing 28. The first deep groove ball bearing 38 is fixed inside the third bearing housing 28. A second deep groove ball bearing 47 is sleeved on the bearing shaft 39 at the corresponding position of the fourth bearing housing 32. The second deep groove ball bearing 47 is fixed inside the fourth bearing housing 32. The bearing shaft 39 is fixed by the first deep groove ball bearing 38 and the second deep groove ball bearing 47. The first deep groove ball bearing 38 and the second deep groove ball bearing 47 are fixed to the test bench by the third bearing housing 28 and the fourth bearing housing 32, respectively. A second thrust ball bearing 49 is sleeved on the bearing shaft 39 at the corresponding position of the electromagnetic mounting bracket 33. The second thrust ball bearing 49 is fixed inside the electromagnetic mounting bracket 33. An electromagnetic actuator 48 is sleeved on the bearing shaft 39 and fixed to the side of the electromagnetic mounting bracket 33 near the fourth bearing seat 32. An axial loading pad 34 and an axial bearing pad 35 are sequentially sleeved on the bearing shaft 39 from the electromagnetic mounting bracket 33 to the axial mounting bracket 36. A guide key 50 is provided between the axial loading pad 34 and the bearing shaft 39. A second pressure sensor 51 is fixed inside the axial mounting bracket 36. A cover 37 is installed on the side of the axial mounting bracket 36 away from the electromagnetic mounting bracket 33.

[0043] The radial loading mechanism 58 includes a radial bearing pad 46, which is sleeved on the bearing shaft 39, and a radial loading pad 45 is sleeved on the outside of the radial bearing pad 46;

[0044] The assembly also includes a radial loading tile support 31. A piezoelectric actuator mounting plate 30 is fixedly connected to the upper part of the radial loading tile support 31. The piezoelectric actuator mounting plate 30 and the radial loading tile support 31 have corresponding vertical through holes. A screw cap 29 is installed in the through hole. A first thrust ball bearing 40 is connected below the screw cap 29. An upper abutment plate 41 is connected to the lower part of the first thrust ball bearing 40. A piezoelectric actuator 42 is connected to the lower end of the upper abutment plate 41. A lower support plate 43 is connected to the lower end of the piezoelectric actuator 42. The lower support plate 43 is slidably connected to the inner side of the radial loading tile support 31. A first pressure sensor 44 is fixedly connected to the lower end of the lower support plate 43. The first pressure sensor 44 is in contact with the radial loading tile 45. The first pressure sensor 44 is used to detect the magnitude of the radial loading force. A return spring at the end of the assembly is used to disengage the loading tile 45 from the bearing tile 46 during unloading. The position of the radial loading assembly relative to the radial bearing pad 46 can be adjusted by manually rotating the screw cap 29. During the adjustment process, the rotation of the screw cap 29 is isolated by the first thrust ball bearing 40, keeping the piezoelectric actuator 42 in a fixed relative position within the assembly. The loading disc of the electromagnetic actuator 48 applies a load to the axial loading pad 34 via the second thrust ball bearing 49, causing the loading pad to produce a slight axial displacement, which further transmits the load to the axial bearing pad 35. One end of the axial bearing pad 35 is connected to a second pressure sensor 51 to detect the magnitude of the axial loading force. The axial loading pad 34 is circumferentially fixed on the bearing shaft 39 by the guide key 50 and can rotate with the shaft, but the second thrust ball bearing 49 isolates this rotation, keeping the components of the electromagnetic actuator 48 stationary.

[0045] This invention provides an intermittent friction and wear testing device, the working principle of which is as follows:

[0046] The bearing under test is installed in the test loading device 55. The required bearing bush parts are selected and installed in the radial and axial loading mechanisms. The cap 29 is manually rotated to adjust the position of the radial loading assembly relative to the radial bearing bush 46. The entire test device is powered on, and the three-phase asynchronous motor 1 in the drive device 52 is started. The output speed of the three-phase asynchronous motor 1 is reduced and the torque is increased through the gear reducer 5 in the transmission device 53. Then, the intermittent device 54 converts the full-rotation motion into circumferential reciprocating intermittent motion, and the torque is further increased through the spur gear 19 cooperating with the output drive shaft to meet the experimental requirements. Subsequently, the test loading device 55 receives the large torque output from the intermittent device 54 and applies it to the bearing under test. The torque is measured by the torque sensor 25. The radial and axial loading mechanisms apply load, and the radial and axial loads are measured by the first pressure sensor 44. Finally, according to the experimental requirements, the speed, torque, radial load, and axial load of the bearing shaft are gradually adjusted to obtain experimental data and complete the experiment.

[0047] Example 1

[0048] like Figure 1 As shown, the intermittent friction and wear testing device proposed in this embodiment includes a driving device 52, a transmission device 53, an intermittent device 54, and a test loading device 55. The driving device 52, transmission device 53, intermittent device 54, and test loading device 55 are arranged in a straight line. The output shaft of the driving device 52 is connected to the input shaft of the transmission device 53. The intermittent device 54 is provided with an incomplete gear 16, a lower rack 14, and an upper rack 18. The incomplete gear 16 is connected to the output shaft of the transmission device 53, and the output shaft of the intermittent device 54 is connected to the input shaft of the test loading device 55.

[0049] Example 2

[0050] like Figure 1 As shown, the intermittent friction and wear testing device proposed in this embodiment includes a driving device 52, a transmission device 53, an intermittent device 54, and a test loading device 55. The driving device 52, transmission device 53, intermittent device 54, and test loading device 55 are arranged in a straight line. The output shaft of the driving device 52 is connected to the input shaft of the transmission device 53. The intermittent device 54 is provided with an incomplete gear 16, a lower rack 14, and an upper rack 18. The incomplete gear 16 is connected to the output shaft of the transmission device 53, and the output shaft of the intermittent device 54 is connected to the input shaft of the test loading device 55.

[0051] like Figure 2 As shown, the drive device 52 includes a three-phase asynchronous motor 1, and the output shaft of the three-phase asynchronous motor 1 is fixedly connected to a first coupling 3;

[0052] The lower part of the three-phase asynchronous motor 1 is fixed with a motor base 2.

[0053] Example 3

[0054] like Figure 1 As shown, the intermittent friction and wear testing device proposed in this embodiment includes a driving device 52, a transmission device 53, an intermittent device 54, and a test loading device 55. The driving device 52, transmission device 53, intermittent device 54, and test loading device 55 are arranged in a straight line. The output shaft of the driving device 52 is connected to the input shaft of the transmission device 53. The intermittent device 54 is provided with an incomplete gear 16, a lower rack 14, and an upper rack 18. The incomplete gear 16 is connected to the output shaft of the transmission device 53, and the output shaft of the intermittent device 54 is connected to the input shaft of the test loading device 55.

[0055] like Figure 2 As shown, the drive device 52 includes a three-phase asynchronous motor 1, and the output shaft of the three-phase asynchronous motor 1 is fixedly connected to a first coupling 3;

[0056] The lower part of the three-phase asynchronous motor 1 is fixed with a motor base 2.

[0057] like Figure 3 As shown, the transmission device 53 includes a gear reducer 5, a second coupling 4 that cooperates with the first coupling 3 is fixedly connected to one side of the gear reducer 5, and a third coupling 7 is fixedly connected to the other side of the gear reducer 5.

[0058] The gearbox 5 is fixedly connected to the gearbox base 6 at its lower part.

[0059] Example 4

[0060] like Figure 1 As shown, the intermittent friction and wear testing device proposed in this embodiment includes a driving device 52, a transmission device 53, an intermittent device 54, and a test loading device 55. The driving device 52, transmission device 53, intermittent device 54, and test loading device 55 are arranged in a straight line. The output shaft of the driving device 52 is connected to the input shaft of the transmission device 53. The intermittent device 54 is provided with an incomplete gear 16, a lower rack 14, and an upper rack 18. The incomplete gear 16 is connected to the output shaft of the transmission device 53, and the output shaft of the intermittent device 54 is connected to the input shaft of the test loading device 55.

[0061] like Figure 2 As shown, the drive device 52 includes a three-phase asynchronous motor 1, and the output shaft of the three-phase asynchronous motor 1 is fixedly connected to a first coupling 3;

[0062] The lower part of the three-phase asynchronous motor 1 is fixed with a motor base 2.

[0063] like Figure 3 As shown, the transmission device 53 includes a gear reducer 5, a second coupling 4 that cooperates with the first coupling 3 is fixedly connected to one side of the gear reducer 5, and a third coupling 7 is fixedly connected to the other side of the gear reducer 5.

[0064] The gearbox 5 is fixedly connected to the gearbox base 6 at its lower part.

[0065] like Figure 4 As shown, the intermittent device 54 includes a sliding guide rail 12, which is horizontally arranged. A first guide rail bracket 13 and a second guide rail bracket 22 are slidably connected to the sliding guide rail 12. A rack mounting bracket 15 is fixedly connected to the upper part of the first guide rail bracket 13 and the second guide rail bracket 22. The longitudinal section of the rack mounting bracket 15 is "U" shaped. A lower rack 14 and an upper rack 18 are horizontally installed inside the corresponding section of the first guide rail bracket 13 on the rack mounting bracket 15. Both the lower rack 14 and the upper rack 18 are parallel to the sliding guide rail 12. A straight rack 21 is horizontally installed outside the corresponding section of the second guide rail bracket 22 on the rack mounting bracket 15. The straight rack 21 is parallel to the sliding guide rail 12.

[0066] It also includes two first bearing seats 9 and two second bearing seats 10. The sliding guide rail 12 passes through the two first bearing seats 9 and the two second bearing seats 10 respectively. An intermittent shaft 17 is provided between the two first bearing seats 9 in a direction perpendicular to the sliding guide rail 12. An incomplete gear 16 is sleeved on the outside of the intermittent shaft 17. The incomplete gear 16 meshes with the lower rack 14 and the upper rack 18 respectively. A transmission shaft 20 is provided between the two second bearing seats 10 in a direction perpendicular to the sliding guide rail 12. A spur gear 19 is sleeved on the outside of the transmission shaft 20. The spur gear 19 meshes with the spur rack 21.

Claims

1. An intermittent friction and wear testing device, characterized in that, The device includes a drive unit (52), a transmission unit (53), an intermittent device (54), and a test loading device (55). The drive unit (52), transmission unit (53), intermittent device (54), and test loading device (55) are arranged in a straight line. The output shaft of the drive unit (52) is connected to the input shaft of the transmission unit (53). The intermittent device (54) is provided with an incomplete gear (16), a lower rack (14), and an upper rack (18). The incomplete gear (16) is connected to the output shaft of the transmission unit (53), and the output shaft of the intermittent device (54) is connected to the input shaft of the test loading device (55). The test loading device (55) includes a torque measuring mechanism (56), which is bolted to a loading mechanism (57). The loading mechanism (57) includes a bearing shaft (39). One end of the bearing shaft (39) is fixedly connected to an eighth coupling (27) that mates with the seventh coupling (26). The other end of the bearing shaft (39) is fixedly connected to a second pressure sensor (51). Along the direction from the eighth coupling (27) to the axial mounting bracket (36), the bearing shaft (39) is sequentially equipped with a third bearing housing (28), a radial loading mechanism (58), a fourth bearing housing (32), an electromagnetic mounting bracket (33), and an axial mounting bracket (36). A first deep groove ball bearing (38) is sleeved on the bearing shaft (39) at the corresponding position of the third bearing housing (28). The first deep groove ball bearing (38) is fixedly connected inside the third bearing housing (28). A second deep groove ball bearing (47) is sleeved on the bearing shaft (39) at the corresponding position of the fourth bearing housing (32). The second deep groove ball bearing (47) is fixedly connected to the third bearing housing (28). Inside the fourth bearing housing (32), a second thrust ball bearing (49) is sleeved on the bearing shaft (39) at the corresponding position of the electromagnetic mounting frame (33). The second thrust ball bearing (49) is fixed inside the electromagnetic mounting frame (33). An electromagnetic actuator (48) is sleeved on the bearing shaft (39). The electromagnetic actuator (48) is fixed on the side of the electromagnetic mounting frame (33) near the fourth bearing housing (32). An axial loading pad (34) and an axial bearing pad (35) are sleeved sequentially on the bearing shaft (39) from the electromagnetic mounting frame (33) to the axial mounting frame (36). A guide key (50) is provided between the axial loading pad (34) and the bearing shaft (39). A second pressure sensor (51) is fixed inside the axial mounting frame (36). A cover plate (37) is installed on the side of the axial mounting frame (36) away from the electromagnetic mounting frame (33).

2. The intermittent friction and wear testing device according to claim 1, characterized in that, The drive device (52) includes a three-phase asynchronous motor (1), and the output shaft of the three-phase asynchronous motor (1) is fixedly connected to a first coupling (3). The three-phase asynchronous motor (1) is fixedly connected to a motor base (2) at its lower part.

3. The intermittent friction and wear testing device according to claim 2, characterized in that, The transmission device (53) includes a gear reducer (5), a second coupling (4) that cooperates with the first coupling (3) is fixedly connected to one side of the gear reducer (5), and a third coupling (7) is fixedly connected to the other side of the gear reducer (5). The gearbox (5) is fixedly connected to a gearbox base (6) at its lower part.

4. The intermittent friction and wear testing device according to claim 3, characterized in that, The intermittent device (54) includes a sliding guide rail (12), which is horizontally arranged. A first guide rail bracket (13) and a second guide rail bracket (22) are slidably connected on the sliding guide rail (12). A rack mounting bracket (15) is fixedly connected to the upper part of the first guide rail bracket (13) and the second guide rail bracket (22). The rack mounting bracket (15) has a longitudinal section in the shape of a horizontally placed "P". A lower rack (14) and an upper rack (18) are horizontally installed inside the corresponding section of the first guide rail bracket (13) on the rack mounting bracket (15). The lower rack (14) and the upper rack (18) are both arranged parallel to the sliding guide rail (12). A straight rack (21) is horizontally installed outside the corresponding section of the second guide rail bracket (22) on the rack mounting bracket (15). The straight rack (21) is arranged parallel to the sliding guide rail (12). It also includes two first bearing seats (9) and two second bearing seats (10). The sliding guide rail (12) passes through the two first bearing seats (9) and the two second bearing seats (10) respectively. An intermittent shaft (17) is provided between the two first bearing seats (9) in a direction perpendicular to the sliding guide rail (12). An incomplete gear (16) is sleeved on the outside of the intermittent shaft (17). The incomplete gear (16) meshes with the lower rack (14) and the upper rack (18) respectively. A transmission shaft (20) is provided between the two second bearing seats (10) in a direction perpendicular to the sliding guide rail (12). A spur gear (19) is sleeved on the outside of the transmission shaft (20). The spur gear (19) meshes with the spur rack (21).

5. The intermittent friction and wear testing device according to claim 4, characterized in that, The The first bearing housing (9) is fixedly connected to the side of a fourth coupling (8) that cooperates with the third coupling (7), and the center of the fourth coupling (8) is on the axis of the intermittent shaft (17).

6. The intermittent friction and wear testing device according to claim 5, characterized in that, The second bearing housing (10) is fixed to the side of a fifth coupling (11), the center of which is on the axis of the transmission shaft (20).

7. The intermittent friction and wear testing device according to claim 6, characterized in that, The torque measuring mechanism (56) includes a torque sensor (25), a sixth coupling (23) that cooperates with the fifth coupling (11) is fixedly connected to one side of the torque sensor (25), and a seventh coupling (26) is fixedly connected to the other side of the torque sensor (25). The torque sensor (25) is fixedly connected to a sensor base (24) at its lower part.

8. The intermittent friction and wear testing device according to claim 7, characterized in that, The radial loading mechanism (58) includes a radial bearing tile (46), which is sleeved on the bearing shaft (39), and a radial loading tile (45) is sleeved on the outside of the radial bearing tile (46). It also includes a radial loading tile bracket (31), on the upper part of which a piezoelectric actuator mounting plate (30) is fixedly connected. The piezoelectric actuator mounting plate (30) and the radial loading tile bracket (31) have corresponding through holes vertically opened. A screw cap (29) is installed in the through hole. A first thrust ball bearing (40) is connected below the screw cap (29). An upper abutment plate (41) is connected to the lower part of the first thrust ball bearing (40). A piezoelectric actuator (42) is connected to the lower end of the upper abutment plate (41). A lower support plate (43) is connected to the lower end of the piezoelectric actuator (42). The lower support plate (43) is slidably connected to the inner side of the radial loading tile bracket (31). A first pressure sensor (44) is fixedly connected to the lower end of the lower support plate (43). The first pressure sensor (44) is in contact with the radial loading tile (45).

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