Bearing fatigue life testing machine

Abstract

The invention relates to the technical field of bearing testing, in particular to a bearing fatigue life testing machine which comprises a mounting plate, an arc-shaped sliding rail is fixedly connected to the mounting plate, a sliding part is slidably matched with the sliding rail, a connecting shaft is rotatably mounted on the sliding part, and the connecting shaft is rotatably connected with the mounting plate. The connecting shaft is in threaded fit with a first fixing nut and a second fixing nut to fix an inner ring of the tested bearing, the mounting plate is provided with a clamp to fix an outer ring of the tested bearing, and the mounting plate is provided with a driving mechanism to drive the connecting shaft to rotate and swing. According to the bearing testing device, the bearing can be tested, the bearing can be tested in a swinging mode, when different types of bearings are tested, the testing types can be switched only through rotation of the screw rod, the time needed in the dismounting and mounting process of the tested bearing is saved, and the probability that a tester is scalded by the tested bearing is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bearing testing, and in particular to a bearing fatigue life testing machine. Background Art

[0002] Bearings are highly standardized and specialized products with complex working conditions. To ensure that the products meet the standards, test equipment is needed to simulate the working conditions to test the life of the bearings. However, traditional bearing test equipment has a single test function, and most test equipment can only perform rotation tests on plane bearings. However, with the development of technology, spherical bearings are used in more and more scenarios. When testing spherical bearings, they are not only tested for rotation, but also for swing. However, most existing test equipment only has one of these test functions. To perform another test, the test bearing needs to be removed and installed in another test equipment. The disassembly and assembly process of the bearing not only wastes a lot of time, but also the tested bearing has an extremely high temperature, and the test personnel may be burned during the replacement process. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcoming of the single testing function of the bearing testing equipment in the prior art, and to propose a bearing fatigue life testing machine.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A bearing fatigue life test machine is designed, comprising a mounting plate, a circular arc-shaped slide rail is fixedly connected to the mounting plate, a sliding member is slidably matched with the slide rail, a connecting shaft is rotatably mounted on the sliding member, a first fixing nut and a second fixing nut are threadedly matched on the connecting shaft to fix the inner ring of the test bearing, the mounting plate is provided with a clamp to fix the outer ring of the test bearing, and the mounting plate is provided with a driving mechanism to drive the connecting shaft to rotate and swing.

[0006] Preferably, the driving mechanism includes a rotating shaft, which is rotatably mounted on a mounting plate, a motor seat is fixedly connected to the mounting plate, a motor is fixedly connected to the motor seat, a turntable is fixedly connected to the output end of the motor, a short shaft is fixedly connected to the turntable, a connecting plate is rotatably mounted on the rotating shaft, a sliding rod is fixedly connected to the connecting plate, a sliding groove is provided on the connecting plate, the short shaft can be slidably engaged in the sliding groove, a sliding sleeve is sleeved on the sliding rod, a connecting rod is fixedly connected to the sliding sleeve, a rack is fixedly connected to the connecting rod, and the rack is rotatably connected to the sliding member through a connecting structure.

[0007] Preferably, the connecting structure includes a spline shaft, the spline shaft is rotatably mounted on a sliding member, the spline shaft is slidably fitted with an internal spline tube, a gear is fixedly connected to the internal spline tube, a first connecting member is rotatably mounted on the internal spline tube, a second connecting member is rotatably mounted on the first connecting member, a slot is provided on the second connecting member, the rack is slidably fitted in the slot, and the rack matches the gear.

[0008] Preferably, a screw hole is provided on the second connecting member, a screw rod is fitted in the inner thread of the screw hole, a slider is fixed to the screw rod, a guide groove is provided on the rack, the slider can be slidably fitted in the guide groove, and a friction block is provided in the groove.

[0009] Preferably, a power conversion structure is provided on the sliding member to connect the spline shaft with the connecting shaft.

[0010] Preferably, the power conversion structure includes a mounting tube, which is fixed on the sliding member, and the mounting tube, the connecting shaft and the spline shaft are coaxially arranged, the spline shaft is coaxially fixedly connected with an input shaft, the connecting shaft is coaxially fixedly connected with an output shaft, the input shaft and the output shaft are connected via a first one-way bearing, the input shaft is provided with a second one-way bearing, the second one-way bearing is provided with a first end face gear, the output shaft is provided with a third one-way bearing, the third one-way bearing is provided with a second end face gear, a transmission gear is rotatably installed on the mounting tube, and the first end face gear and the second end face gear both cooperate with the transmission gear.

[0011] The present invention proposes a bearing fatigue life test machine, which has the beneficial effect that the test machine provided by the present invention can not only perform rotation tests on bearings, but also perform swing tests on bearings. When performing different types of bearing tests, the test type can be switched only by rotating the screw, which not only avoids the time required for the disassembly and assembly process of the test bearings, but also greatly reduces the probability of test personnel being burned by the test bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a bearing fatigue life test machine proposed by the present invention.

[0013] Figure 2 A bearing fatigue life test machine proposed by the present invention Figure 1 Enlarged view of center C.

[0014] Figure 3 This is a front view of a bearing fatigue life test machine proposed by the present invention.

[0015] Figure 4A bearing fatigue life test machine proposed by the present invention Figure 3 AA section view.

[0016] Figure 5 A bearing fatigue life test machine proposed by the present invention Figure 4 Enlarged view of point D in the middle.

[0017] Figure 6 A bearing fatigue life test machine proposed by the present invention Figure 4 Middle BB section.

[0018] Figure 7 A bearing fatigue life test machine proposed by the present invention Figure 6 A partial enlarged view.

[0019] Figure 8 A schematic diagram of the structure of the first connecting member and the second connecting member of a bearing fatigue life test machine proposed by the present invention Figure 1 .

[0020] Fig. 9 A schematic diagram of the structure of the first connecting member and the second connecting member of a bearing fatigue life test machine proposed by the present invention Figure 2 .

[0021] Fig.10 A schematic diagram of the structure of the first connecting member and the second connecting member of a bearing fatigue life test machine proposed by the present invention Figure 3 .

[0022] In the figure: 1, motor seat; 2, mounting plate; 3, motor; 4, turntable; 5, short shaft; 6, rotating shaft; 7, connecting plate; 8, sliding rod; 9, sliding groove; 10, connecting rod; 11, sliding sleeve; 12, rack; 13, guide groove; 14, sliding member; 15, spline shaft; 16, inner spline tube; 17, first connecting member; 18, gear; 19, second connecting member; 20, screw hole; 21, screw; 22, notch; 23, friction block ; 24. Slider; 25. Input shaft; 26. Output shaft; 27. First one-way bearing; 28. First end gear; 29. ​​Second one-way bearing; 30. Transmission gear; 31. Second end gear; 32. Connecting shaft; 33. Test bearing; 34. Fixture; 35. First fixing nut; 36. Second fixing nut; 37. Mounting tube; 38. Slide rail; 39. Third one-way bearing; 40. Brake block; 41. Spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1

[0025] Reference Figure 1-4 A bearing fatigue life test machine includes a mounting plate 2, a circular arc-shaped slide rail 38 is fixedly connected to the mounting plate 2, a sliding member 14 is slidably matched on the slide rail 38, a connecting shaft 32 is rotatably mounted on the sliding member 14, a first fixing nut 35 and a second fixing nut 36 are threadedly matched on the connecting shaft 32 to fix the inner ring of the test bearing 33, the mounting plate 2 is provided with a clamp 34 to fix the outer ring of the test bearing 33, and a driving mechanism is provided on the mounting plate 2 to drive the connecting shaft 32 to rotate and swing.

[0026] When conducting the test, the test bearing 33 is placed in the fixture 34 to align the outer ring of the test bearing 33. The inner ring of the test bearing 33 is sleeved on the connecting shaft 32. The distance between the first fixing nut 35 and the second fixing nut 36 is adjusted by rotation to clamp and fix the inner ring of the test bearing 33. At this time, the test bearing 33 can be rotated by driving the connecting shaft 32 to perform a rotation test, and the test bearing 33 can be swung by driving the connecting shaft 32 to perform a swing test.

[0027] Example 2

[0028] like Figure 1-2 The driving mechanism includes a rotating shaft 6, which is rotatably mounted on a mounting plate 2, a motor base 1 is fixedly connected to the mounting plate 2, a motor 3 is fixedly connected to the motor base 1, a turntable 4 is fixedly connected to the output end of the motor 3, a short shaft 5 is fixedly connected to the turntable 4, a connecting plate 7 is rotatably mounted on the rotating shaft 6, a sliding rod 8 is fixedly connected to the connecting plate 7, a sliding groove 9 is provided on the connecting plate 7, the short shaft 5 can be slidably fitted in the sliding groove 9, a sliding sleeve 11 is sleeved on the sliding rod 8, a connecting rod 10 is fixedly connected to the sliding sleeve 11, a rack 12 is fixedly connected to the connecting rod 10, and the rack 12 is rotatably connected to a sliding member 14 through a connecting structure.

[0029] After the motor 3 is started, it will drive the turntable 4 to rotate. The rotation of the turntable 4 will drive the short shaft 5 to rotate around the axis of the motor 3. During the rotation of the short shaft 5, it will drive the connecting plate 7 to swing back and forth around the rotating shaft 6. During the swinging of the connecting plate 7, the connecting rod 10 is driven to swing synchronously through the sliding sleeve 11, and the connecting rod 10 drives the rack 12 to swing synchronously. Since the rack 12 is rotatably engaged on the sliding member 14, the rack 12 will drive the sliding member 14 to swing back and forth. During the swinging of the sliding member 14, it will drive the connecting shaft 32 to swing, thereby performing a swing test on the test bearing 33.

[0030] Example 3

[0031] like Figure 6-10The connecting structure includes a spline shaft 15, which is rotatably mounted on a sliding member 14. The spline shaft 15 is slidably matched with an inner spline tube 16, and a gear 18 is fixedly connected to the inner spline tube 16. A first connecting member 17 is rotatably mounted on the inner spline tube 16, and a second connecting member 19 is rotatably mounted on the first connecting member 17. A notch 22 is provided on the second connecting member 19, and a rack 12 is slidably matched in the notch 22. The rack 12 matches the gear 18. A screw hole 20 is provided on the second connecting member 19, and a screw rod 21 is matched with the inner thread of the screw hole 20. A slider 24 is fixedly connected to the screw rod 21. A guide groove 13 is provided on the rack 12, and the slider 24 is slidably matched in the guide groove 13. A friction block 23 is provided in the notch 22.

[0032] The screw rod 21 is driven to rotate. The screw rod 21 drives the slider 24 to move synchronously during the rotation process. The slider 24 drives the rack 12 to move synchronously during the movement process. The rack 12 has two movement states:

[0033] The first state: the slider 24 drives the rack 12 to move until the rack 12 abuts against the friction block 23. At this time, the rack 12 and the friction block 23 are fixed together under the action of friction force. At this time, the rack 12 and the second connecting member 19 are regarded as one body;

[0034] Furthermore, since the second connecting member 19 is rotatably fitted on the first connecting member 17, and the first connecting member 17 is connected to the sliding member 14 through the inner spline tube 16 and the spline shaft 15, it can be regarded that the first connecting member 17 is connected to the sliding member 14;

[0035] Therefore, at this time, the rack 12 can be rotatably engaged on the sliding member 14 through the second connecting member 19, so that the rack 12 drives the sliding member 14 to swing during the swinging process, so as to perform a swing test on the test bearing 33.

[0036] The second state: the slider 24 drives the rack 12 to move until the rack 12 is engaged with the gear 18. At this time, the rack 12 can slide in the notch 22. The rack 12 swings under the drive of the connecting rod 10.

[0037] Taking the second connecting member 19 as a reference, at this time, the swing of the rack 12 will cause the rack 12 to perform linear reciprocating motion in the slot 22 , and the rack 12 will drive the gear 18 to perform continuous forward and reverse rotation during the linear reciprocating motion.

[0038] The gear 18 will drive the inner spline tube 16 to rotate forward and reverse during the forward and reverse rotation, and the inner spline tube 16 will cause the spline shaft 15 to rotate forward and reverse on the sliding member 14. Since the spline shaft 15 is connected to the connecting shaft 32 through a power conversion structure, the connecting shaft 32 will be driven to rotate through the power conversion structure during the rotation of the spline shaft 15, thereby performing a rotation test on the test bearing 33.

[0039] Example 4

[0040] like Figure 4-5 A mounting tube 37 is fixedly connected to the sliding member 14. The mounting tube 37, the connecting shaft 32 and the spline shaft 15 are coaxially arranged. The input shaft 25 is coaxially fixedly connected to the spline shaft 15. The output shaft 26 is coaxially fixedly connected to the connecting shaft 32. The input shaft 25 and the output shaft 26 are connected via a first one-way bearing 27. A second one-way bearing 29 is provided on the input shaft 25. A first end face gear 28 is installed on the second one-way bearing 29. A third one-way bearing 39 is provided on the output shaft 26. A second end face gear 31 is installed on the third one-way bearing 39. A transmission gear 30 is rotatably installed on the mounting tube 37. Both the first end face gear 28 and the second end face gear 31 cooperate with the transmission gear 30.

[0041] Based on the description in the above embodiment 3, it can be known that when the rack 12 is in the second state, the spline shaft 15 will continue to rotate forward and reverse, and the spline shaft 15 will drive the input shaft 25 to rotate forward and reverse synchronously, wherein:

[0042] For the third one-way bearing 39 , with the second end face gear 31 as a reference, when the input shaft 26 rotates forward relative to the second end face gear 31 , the third one-way bearing 39 rotates freely; when the input shaft 26 rotates reversely relative to the second end face gear 31 , the third one-way bearing 39 is locked.

[0043] When the input shaft 25 rotates forward, the three one-way bearings are in the following states: the first one-way bearing 27 is locked, and the second one-way bearing 29 is free to rotate;

[0044] At this time, the locking of the first one-way bearing 27 is equivalent to a fixed connection between the input shaft 25 and the output shaft 26. The positive rotation of the input shaft 25 will drive the output shaft 26 to rotate forward. The positive rotation of the output shaft 26 is relative to the second end face gear 31, and will not cause interference to the second end face gear 31. Therefore, the output shaft 25 will drive the connecting shaft 32 to rotate forward.

[0045] When the input shaft 25 rotates in reverse, the three one-way bearings are in the following states: the first one-way bearing 27 rotates freely, and the second one-way bearing 29 is locked;

[0046] At this time, the locking of the second one-way bearing 29 is equivalent to the fixed connection between the input shaft 25 and the first end face gear 28, and the locking of the third one-way bearing 39 is equivalent to the fixed connection between the output shaft 26 and the second end face gear 31. Therefore, the reverse rotation of the input shaft 25 will drive the first end face gear 28 to reverse, and the reverse rotation of the first end face gear 28 will drive the second end face gear 31 to rotate through the transmission gear 30, and the rotation direction of the second end face gear 31 is opposite to that of the first end face gear 28. Therefore, the second end face gear 31 will rotate forward;

[0047] When the second end face gear 31 is in the forward rotation state, the output shaft 26 is reversed relative to the second end face gear 31 with the second end face gear 31 as a reference. Therefore, the third one-way bearing 39 is in a locked state at this time, and the second end face gear 31 and the output shaft 26 can be regarded as fixedly connected, and the second end face gear 31 will drive the output shaft 26 to rotate synchronously;

[0048] Therefore, the forward rotation of the second end gear 31 will drive the output shaft 26 to rotate forward, and the forward rotation of the output shaft 26 will drive the connecting shaft 32 to rotate forward.

[0049] Based on the above, it can be known that during the continuous forward and reverse rotation of the spline shaft 15, the connecting shaft 32 always rotates forward, so the rotation direction output by the connecting shaft 32 does not change, thereby performing a rotation test on the test bearing 33.

[0050] Example 5

[0051] like Figure 6-7 As shown, a blind hole is formed on the inner spline tube 16 , a spring 41 is disposed in the blind hole, and a brake block 40 made of a magnetic material is fixedly connected to the spring 41 .

[0052] The slider 24 is also made of magnetic material, and a repulsive magnetic force is generated between the slider 24 and the brake block 40 .

[0053] When the rack 12 contacts the friction block 23, the magnetic force between the slider 24 and the brake block 40 is smaller than the elastic force of the spring 41. Under the elastic force of the spring 41, the brake block 40 abuts against the spline shaft 15, thereby preventing the inner spline tube 16 from sliding freely on the spline shaft 15.

[0054] When the rack 12 is meshed with the gear 18 , the magnetic force between the slider 24 and the brake block 40 is greater than the elastic force of the spring 41 . Under the action of the magnetic force, the spring 41 is compressed, and the brake block 40 retracts into the blind hole. At this time, the inner spline tube 16 can slide freely on the spline shaft 15 .

[0055] Working principle and workflow:

[0056] When testing the test bearing 33, the test bearing 33 is placed in the fixture 34 to test the outer ring of the test bearing 33. The inner ring of the test bearing 33 is sleeved on the connecting shaft 32, and the distance between the first fixing nut 35 and the second fixing nut 36 is adjusted by rotation to clamp and fix the inner ring of the test bearing 33.

[0057] Perform an oscillation test on the test bearing 33:

[0058] S1: driving the screw 21 to rotate, the screw 21 drives the rack 12 to abut against the friction block 23 through the slider 24, and the rack 12 is now considered as a whole with the second connecting member 19;

[0059] When the rack 12 contacts the friction block 23, the magnetic force between the slider 24 and the brake block 40 is smaller than the elastic force of the spring 41. Under the elastic force of the spring 41, the brake block 40 abuts against the spline shaft 15, thereby keeping the inner spline tube 16 and the spline shaft 15 relatively still.

[0060] S2: Start the motor 3. The motor 3 drives the turntable 4 to rotate. The rotation of the turntable 4 will drive the short shaft 5 to rotate. During the rotation of the short shaft 5, the connecting plate 7 will be driven to swing back and forth around the rotating shaft 6. During the swinging of the connecting plate 7, the connecting rod 10 will be driven to swing synchronously through the sliding sleeve 11. The connecting rod 10 will drive the rack 12 to swing synchronously. The rack 12 will drive the sliding member 14 to swing back and forth. During the swinging of the sliding member 14, the connecting shaft 32 will be driven to swing, so as to perform a swing test on the test bearing 33.

[0061] Perform a rotation test on the test bearing 33:

[0062] T1: Drive the screw 21 to rotate, and the screw 21 drives the rack 12 to move through the slider 24, so that the rack 12 is meshed with the gear 18;

[0063] When the rack 12 is meshed with the gear 18 , the magnetic force between the slider 24 and the brake block 40 is greater than the elastic force of the spring 41 . Under the action of the magnetic force, the spring 41 is compressed, and the brake block 40 retracts into the blind hole. At this time, the inner spline tube 16 can slide freely on the spline shaft 15 .

[0064] T2: Start the motor 3, which drives the turntable 4 to rotate. The rotation of the turntable 4 will drive the short shaft 5 to rotate. During the rotation of the short shaft 5, the connecting plate 7 will swing back and forth around the rotating shaft 6. During the swinging of the connecting plate 7, the connecting rod 10 will swing synchronously through the sliding sleeve 11, and the connecting rod 10 will drive the rack 12 to swing synchronously.

[0065] As for the swing of the rack 12, the swing of the rack 12 can be decomposed into a displacement in the vertical direction and a displacement in the horizontal direction;

[0066] Since the inner spline tube 16 can slide freely on the spline shaft 15 , the inner spline tube 16 can slide on the spline shaft 15 to release the vertical displacement, while the horizontal displacement can make the rack 12 slide in the notch 22 .

[0067] T3: The swinging causes the rack 12 to perform a linear reciprocating motion in the slot 22, and the rack 12 drives the gear 18 to perform a continuous forward and reverse rotation during the linear reciprocating motion;

[0068] The gear 18 will drive the inner spline tube 16 to rotate forward and reverse during the forward and reverse rotation, and the forward and reverse rotation of the inner spline tube 16 will cause the spline shaft 15 to rotate forward and reverse on the sliding member 14.

[0069] T4: Based on the above-mentioned embodiment 4, it can be known that during the continuous forward and reverse rotation of the spline shaft 15, the connecting shaft 32 always rotates forward, that is, the rotation direction of the connecting shaft 32 does not change, thereby performing a rotation test on the test bearing 33.

[0070] The testing machine provided by the present invention can not only perform rotation tests on bearings, but also perform swing tests on bearings. When performing different types of bearing tests, the test type can be switched simply by rotating the screw 21, which not only avoids the time required for the disassembly and assembly of the test bearings, but also greatly reduces the probability of test personnel being burned by the test bearings.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A bearing fatigue life test machine, comprising a mounting plate (2), It is characterized in that The mounting plate (2) is fixedly connected with an arc-shaped slide rail (38), the slide rail (38) is slidably matched with a slide member (14), a connecting shaft (32) is rotatably mounted on the slide member (14), a first fixing nut (35) and a second fixing nut (36) are threadedly matched on the connecting shaft (32) to fix the inner ring of the test bearing (33), the mounting plate (2) is provided with a clamp (34) to fix the outer ring of the test bearing (33), and a driving mechanism is provided on the mounting plate (2) to drive the connecting shaft (32) to rotate and swing.

2. The bearing fatigue life test machine according to claim 1, It is characterized in that The driving mechanism comprises a rotating shaft (6), the rotating shaft (6) is rotatably mounted on a mounting plate (2), a motor seat (1) is fixedly connected to the mounting plate (2), a motor (3) is fixedly connected to the base (3), a turntable (4) is fixedly connected to the output end of the motor (3), a short shaft (5) is fixedly connected to the turntable (4), a connecting plate (7) is rotatably mounted on the rotating shaft (6), a sliding rod (8) is fixedly connected to the connecting plate (7), a sliding groove (9) is provided on the connecting plate (7), the short shaft (5) is slidably engaged in the sliding groove (9), a sliding sleeve (11) is sleeved on the sliding rod (8), a connecting rod (10) is fixedly connected to the sliding sleeve (11), a rack (12) is fixedly connected to the connecting rod (10), and the rack (12) is rotatably connected to the sliding member (14) through a connecting structure.

3. The bearing fatigue life test machine according to claim 2, It is characterized in that The connection structure comprises a spline shaft (15), the spline shaft (15) is rotatably mounted on a sliding member (14), an inner spline tube (16) is slidably matched on the spline shaft (15), a gear (18) is fixedly connected to the inner spline tube (16), a first connecting member (17) is rotatably mounted on the inner spline tube (16), a second connecting member (19) is rotatably mounted on the first connecting member (17), a notch (22) is provided on the second connecting member (19), the rack (12) is slidably matched in the notch (22), and the rack (12) matches the gear (18).

4. The bearing fatigue life test machine according to claim 3, It is characterized in that The second connecting member (19) is provided with a screw hole (20), the screw hole (20) is internally threaded with a screw rod (21), a slider (24) is fixedly connected to the screw rod (21), a guide groove (13) is provided on the rack (12), the slider (24) can be slidably engaged in the guide groove (13), and a friction block (23) is provided in the notch (22).

5. The bearing fatigue life test machine according to claim 4, It is characterized in that The sliding member (14) is provided with a power conversion structure to connect the spline shaft (15) with the connecting shaft (32).

6. The bearing fatigue life test machine according to claim 5, It is characterized in that The power conversion structure comprises a mounting tube (37), the mounting tube (37) is fixed on a sliding member (14), the mounting tube (37), a connecting shaft (32) and a spline shaft (15) are coaxially arranged, an input shaft (25) is coaxially fixedly connected to the spline shaft (15), an output shaft (26) is coaxially fixedly connected to the connecting shaft (32), the input shaft (25) and the output shaft (26) are connected via a first one-way bearing (27), and the input shaft (25) and the output shaft (26) are coaxially fixedly connected to the spline shaft (15). 5) is provided with a second one-way bearing (29), a first end face gear (28) is mounted on the second one-way bearing (29), a third one-way bearing (39) is provided on the output shaft (26), a second end face gear (31) is mounted on the third one-way bearing (39), a transmission gear (30) is rotatably mounted on the mounting tube (37), and the first end face gear (28) and the second end face gear (31) are both matched with the transmission gear (30).

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