Coupler fatigue test equipment

Abstract

The invention relates to the technical field of coupler fatigue test, in particular to coupler fatigue test equipment which comprises a rack, a fixed seat, a sliding seat, a rotating disc, a first mounting plate, a torque sensor and a second mounting plate, the fixed seat is fixedly connected to the rack, the sliding seat is slidably connected to the rack, and the rotating disc is fixedly connected to the rack; the rotating disc is rotatably connected to the fixed seat around the axis of the rotating disc, the rotating axis of the rotating disc is horizontal, the first mounting plate is connected to the end, facing the sliding seat, of the rotating disc, one end of the torque sensor is fixedly connected to the end, facing the fixed seat, of the sliding seat, and the other end of the torque sensor is fixedly connected to the second mounting plate. The torque sensor and the rotating disc are coaxially arranged, and the first mounting plate and the second mounting plate are used for fixing the two ends of the coupler respectively. The torque sensor is adopted for torque acquisition, and the torque sensor and the coupling adopt a direct connection structure, so that errors caused by transmission are reduced, and the fatigue measurement precision of the coupling is improved.

Description

Technical Field

[0001] This application relates to the field of coupling fatigue test technology, and particularly to a coupling fatigue test device. Background Art

[0002] As a key component connecting the generator and the high-speed shaft of the gearbox in a wind turbine generator set, the wind power coupling not only needs to transmit torque and meet high insulation performance during use, but also needs to meet automatic protection under overload, and at the same time compensate for the axial, radial, and angular offsets generated by the asymmetry of the two shafts of the generator and the high-speed shaft of the gearbox.

[0003] Fatigue testing is the core link for evaluating the performance stability of couplings under long-term cyclic loads, and directly determines their reliability and life in actual applications. As a key component for power transmission, couplings often bear torque fluctuations, vibration shocks, and complex working conditions (such as high temperature and corrosive environments). If not verified through fatigue testing, microcracks in their internal materials may expand due to alternating stresses, ultimately leading to sudden fracture or functional failure, resulting in equipment shutdown and even safety accidents. Through fatigue testing that simulates the actual load spectrum, design weak points (such as stress concentration areas) can be accurately identified, the fatigue resistance of materials (such as S-N curve characteristics) can be verified, and structural parameters (such as diaphragm thickness and bolt pre-tightening force) can be optimized, thereby avoiding early failures caused by design defects or incorrect working condition judgments. In addition, fatigue testing can also provide data support for formulating maintenance cycles. For example, by monitoring the load threshold at the crack initiation stage, preventive maintenance strategies can be guided to reduce unplanned shutdowns.

[0004] During the fatigue testing of couplings, the torque change of the coupling, drive shaft, or other rotating components under the action of torque is measured. When the torque amplitude significantly decreases or abnormally fluctuates due to material fatigue (such as crack propagation), combined with a preset failure threshold (such as a 10% torque decrease or excessive fluctuation), the fatigue failure point can be determined, and thus the fatigue life can be calculated.

[0005] In key transmission components such as wind power couplings, fatigue testing is particularly important, directly affecting the dynamic response, vibration suppression, and fatigue life of the system. However, the existing coupling fatigue test accuracy is low, and it is easy to obtain incorrect test results, resulting in a shortened service life of the wind turbine generator set. Summary of the Invention

[0006] In order to improve the measurement accuracy of the torsional stiffness value of the coupling, this application provides a coupling fatigue test device.

[0007] A coupling fatigue test device provided by this application adopts the following technical solution: A coupling fatigue test equipment comprises a frame, a fixed seat, a sliding seat, a rotating disk, a first mounting plate, a torque sensor and a second mounting plate, wherein the fixed seat is fixedly connected to the frame, the sliding seat is slidably connected to the frame, the rotating disk is rotatably connected to the fixed seat around its own axis, the rotating axis of the rotating disk is horizontal, the first mounting plate is connected to one end of the rotating disk facing the sliding seat, one end of the torque sensor is fixedly connected to one end of the sliding seat facing the fixed seat, the other end of the torque sensor is fixedly connected to the second mounting plate, the torque sensor is coaxially arranged with the rotating disk, and the first mounting plate and the second mounting plate are respectively used to fix the two ends of the coupling.

[0008] By adopting the above technical solution, a torque sensor is used to collect torque, and the torque sensor and the coupling adopt a direct connection structure, which reduces the error caused by transmission and helps to improve the measurement accuracy of the coupling fatigue.

[0009] Preferably, it further comprises a driving motor, wherein the motor housing of the driving motor is fixedly connected to the fixing seat, and the motor shaft of the driving motor is coaxially fixedly connected to the rotating disk.

[0010] By adopting the above technical solution and using a drive motor as a force source, different torque values ​​can be set to facilitate testing the fatigue of the coupling and improve measurement efficiency.

[0011] Preferably, the driving member also includes a driving electric cylinder, a cylinder body of the driving electric cylinder is fixed on a fixed seat, a rotating force arm is connected between the output shaft of the driving electric cylinder and the rotating disk, the rotating force arm includes a first hinged rod and a second hinged rod, an end of the first hinged rod and an end of the second hinged rod are hinged, an end of the first hinged rod away from the second hinged rod is hinged to the output shaft of the driving electric cylinder, and an end of the second hinged rod is fixed to the rotating disk.

[0012] By adopting the above technical solution, the driving electric cylinder and the rotating force arm are used to reciprocate the rotating disk, thereby providing reciprocating torque to the coupling, which makes it easier to test the fatigue of the coupling and improves the measurement efficiency.

[0013] Preferably, it also includes a connecting seat and a screw rod, wherein the connecting seat is fixedly connected to the upper end of the frame, the screw rod is rotatably connected to the connecting seat around its own axis, the rotation axis of the screw rod is parallel to the axis of the rotating disk, the sliding seat is provided with a sliding opening, and the screw rod is threadedly connected to the inner wall of the sliding opening.

[0014] By adopting the above technical solution and using a screw rod to adjust the axial distance, couplings of different specifications can be adapted for testing, thereby improving the versatility of the test equipment and facilitating its use.

[0015] Preferably, it also includes a handwheel, which is coaxially fixedly connected to the screw rod.

[0016] By adopting the above technical solution, the hand wheel controls the rotation of the screw rod, which is easy to operate and easy to control the relative position between the sliding seat and the fixed seat, thereby improving the detection efficiency.

[0017] Preferably, it further comprises a control motor, wherein the motor housing of the control motor is fixedly connected to the upper end of the base, and the motor shaft of the control motor is coaxially fixedly connected to the screw rod.

[0018] By adopting the above technical solution, the motor is controlled to control the rotation of the lead screw, which is easy to operate and easy to control the relative position between the sliding seat and the fixed seat, thereby improving the detection efficiency.

[0019] Preferably, the end of the first mounting plate facing away from the rotating disk is fixedly connected to a first limit member, the end of the second mounting plate facing away from the torque sensor is fixedly connected to a second limit member, the first limit member and the second limit member are coaxially arranged, the first limit member is coaxially arranged with the rotating disk, and the first limit member and the second limit member are both used to limit the coupling.

[0020] By adopting the above technical solution, the coupling can be easily installed, the installation efficiency of the coupling can be improved, and the detection efficiency can be improved.

[0021] Preferably, the first limit member includes a first limit column, the second limit member includes a second limit column, the first limit column and the second limit column are coaxially arranged, the first limit column and the rotating disk are coaxially arranged, the outer wall of the first limit column is fixedly connected with a first limit key, the outer wall of the second limit column is fixedly connected with a second limit key, the first limit column and the second limit column are both used to extend into the coupling, the first limit key and the second limit key are both used to embed into the keyway of the coupling, and the first mounting plate and the second mounting plate are respectively used to abut against the two ends of the coupling.

[0022] By adopting the above technical scheme, the coupling is sleeved on the first limit column, the first limit key is embedded in the keyway of the coupling, the second limit column extends into the coupling, the second limit key is embedded in the keyway of the coupling, the first mounting plate and the second mounting plate abut against both ends of the coupling, thereby improving the installation efficiency of the coupling, the first limit key and the second limit key limit the coupling, thereby improving the fatigue measurement accuracy.

[0023] Preferably, the first limiting member includes a three-jaw chuck, the chuck body of the three-jaw chuck is fixedly connected to the end of the first mounting plate away from the fixed seat, the three-jaw chuck is coaxially arranged with the rotating disk, the claws of the three-jaw chuck are used to abut the inner wall of the coupling, the outer wall of the three-jaw chuck is coaxially fixedly connected with a limiting plate, the limiting plate is arranged between the claws of the three-jaw chuck and the driving port of the three-jaw chuck, and the limiting plate is used to abut the coupling.

[0024] By adopting the above technical solution, the three-jaw chuck can fix couplings of different sizes, improve the applicability of the test equipment, and facilitate fatigue testing.

[0025] Preferably, the first limiting member also includes a spring, a abutment block and a magnet, the outer wall of a jaw of the three-jaw chuck is provided with a mounting groove, one end of the spring is fixedly connected to the bottom of the mounting groove, the other end of the spring is fixedly connected to the abutment block, the abutment block is slidably connected to the groove wall of the mounting groove, the abutment block is used to be embedded in the keyway of the coupling, the upward side of the abutment block is set as an abutment surface, the abutment surface is used to abut the downward groove wall of the keyway, the downward side of the abutment block is set as a limiting surface, the distance from the limiting surface to the abutment surface decreases as it moves away from the spring, the limiting surface is used to abut the upward groove wall of the keyway, the abutment surface is provided with a placement groove, the magnet is fixedly connected to the bottom of the placement groove, and the magnet is used to adsorb the coupling so that the abutment surface abuts the groove wall of the keyway.

[0026] By adopting the above technical solution, the abutment block can adapt to coupling keyways of different sizes, thereby improving the applicability of the test equipment and facilitating fatigue testing.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: The torque sensor is used for torque acquisition. The torque sensor and the coupling are directly connected, which reduces the error caused by transmission and helps to improve the measurement accuracy of the coupling fatigue. The driving electric cylinder and the rotating force arm are used to reciprocate the rotating disk, thereby providing reciprocating torque to the coupling, which is convenient for testing the fatigue of the coupling and improving the measurement efficiency; The three-jaw chuck can fix couplings of different sizes, improve the applicability of the test equipment, and facilitate fatigue testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The utility model is a schematic diagram of the overall structure of a coupling fatigue test equipment.

[0029] Figure 2 It is a schematic diagram of the internal structure of a coupling fatigue test equipment after being cut open.

[0030] Figure 3 It is a schematic diagram of the internal structure of the first mounting plate, the second mounting plate, the first limiting member, the torque sensor and the second limiting member after being cut apart.

[0031] Figure 4 It is an axonometric diagram of the overall structure of a coupling fatigue test equipment.

[0032] Figure 5 A cross-sectional view of a coupling fatigue test device.

[0033] Figure 6 It is a cross-sectional view after the first mounting plate, the second mounting plate, the first limiting member, the torque sensor and the second limiting member are cut open.

[0034] Figure 7 It is a cross-sectional view of the first limiting member.

[0035] Figure 8 It is Figure 7 An enlarged view of the position A in

[0036] Explanation of reference numerals: 1, frame; 2, fixed seat; 21, rotating groove; 22, rotating port; 3, sliding seat; 31, avoiding groove; 32, sliding block; 321, sliding port; 4, driving member; 41, bearing; 42, rotating disc; 43, driving motor; 44, driving electric cylinder; 45, rotating force arm; 451, first hinge rod; 452, second hinge rod; 5, control member; 51, connecting seat; 511, connecting groove; 52, lead screw; 53, hand wheel; 54, control motor; 61, first mounting plate; 62, second mounting plate; 7, first limiting member; 71, first limiting column; 711, first limiting key; 72, three-jaw chuck; 721, limiting plate; 722, mounting groove; 73, spring; 74, abutting block; 741, abutting surface; 742, limiting surface; 743, placing groove; 744, first air port; 745, second air port; 746, air passage; 747, sliding groove; 75, magnet; 76, first airbag; 77, second airbag; 78, sliding frame; 8, torque sensor; 9, second limiting member; 91, second limiting column; 911, second limiting key. Specific embodiments

[0037] The following further elaborates on this application in conjunction with the attached Figure 1-8 drawings.

[0038] The embodiments of this application disclose a coupling fatigue test device. Embodiment 1

[0039] Referring to Figure 1 and Figure 2 , a coupling fatigue test device includes a frame 1, a fixed seat 2, a sliding seat 3, a driving member 4, a control member 5, a first mounting plate 61, a second mounting plate 62, a first limiting member 7, a torque sensor 8 and a second limiting member 9.

[0040] Referring to Figure 2, the fixed seat 2 is fixedly connected to the upper end of the frame 1, and the sliding seat 3 is slidably connected to the upper end of the frame 1. The driving member 4 includes a bearing 41, a rotating disk 42 and a driving motor 43. A rotating groove 21 is provided at one end of the fixed seat 2 facing the sliding seat 3, the bearing 41 is coaxially fixedly connected to the groove wall of the rotating groove 21, the rotating disk 42 is coaxially fixedly connected to the inner wall of the bearing 41, and a rotating opening 22 is provided at one end of the fixed seat 2 away from the sliding seat 3, the rotating opening 22 and the rotating groove 21 are coaxially arranged, the motor housing of the driving motor 43 is fixedly connected to the end of the fixed seat 2 away from the sliding seat 3, and the motor shaft of the driving motor 43 is coaxially fixedly connected to the rotating disk 42 after extending into the rotating opening 22. In this embodiment, the driving motor 43 can be a reduction motor.

[0041] The control member 5 includes a connecting seat 51, a screw rod 52 and a hand wheel 53. The lower end of the sliding seat 3 is provided with an avoidance groove 31, and the avoidance groove 31 passes through the sliding seat 3 along the axis of the rotating disk 42. The connecting seat 51 is arranged in the avoidance groove 31. The connecting seat 51 is fixedly connected to the upper end of the frame 1. The upper end of the connecting seat 51 is provided with a connecting groove 511. The two ends of the screw rod 52 are connected to the groove wall of the connecting groove 511 by rotation around their own axis. The rotation axis of the screw rod 52 is parallel to the axis of the rotating disk 42. The groove bottom of the avoidance groove 31 is fixedly connected with a sliding block 32. The sliding block 32 is provided with a sliding opening 321. The screw rod 52 is threadedly connected to the inner wall of the sliding opening 321. The end of the screw rod 52 away from the fixed seat 2 extends out of the connecting seat 51, and the hand wheel 53 is coaxially fixedly connected to the end of the screw rod 52 away from the fixed seat 2.

[0042] Reference Figure 2 and Figure 3 There are two torque sensors 8, one end of one torque sensor 8 is coaxially fixedly connected to one end of the rotating disk 42 toward the sliding seat 3, the other end of the torque sensor 8 is coaxially fixedly connected to the first mounting plate 61, one end of the other torque sensor 8 is fixedly connected to one end of the sliding seat 3 toward the fixed seat 2, and the other end of the other torque sensor 8 is fixedly connected to the second mounting plate 62. The two torque sensors 8 are coaxially arranged, the first limit member 7 is fixedly connected to one end of the first mounting plate 61 away from the torque sensor 8, and the second limit member 9 is fixedly connected to one end of the second mounting plate 62 away from the torque sensor 8.

[0043] Reference Figure 3, the first limiting member 7 includes a first limiting post 71, the second limiting member 9 includes a second limiting post 91, the first limiting post 71 and the second limiting post 91 are coaxially arranged, the first limiting post 71 and the rotating disc 42 are coaxially arranged, a first limiting key 711 is fixedly connected to the outer wall of the first limiting post 71, a second limiting key 911 is fixedly connected to the outer wall of the second limiting post 91, both the first limiting post 71 and the second limiting post 91 are used to extend into the coupling, both the first limiting key 711 and the second limiting key 911 are used to be embedded into the keyway of the coupling, and the first mounting plate 61 and the second mounting plate 62 are respectively used to abut against both ends of the coupling.

[0044] The implementation principle of Embodiment 1 is as follows: The coupling is sleeved on the first limiting post 71, the first limiting key 711 is embedded into the keyway of the coupling, the hand wheel 53 is rotated to move the sliding seat 3 closer to the fixed seat 2, the second limiting post 91 extends into the coupling, the second limiting key 911 is embedded into the keyway of the coupling, the first mounting plate 61 and the second mounting plate 62 abut against both ends of the coupling, the driving motor 43 is started to apply force to the coupling, and the torque sensor 8 monitors the change of the torque of the coupling. Embodiment 2

[0045] The difference between this embodiment and Embodiment 1 is as follows: Refer to Figure 4 , the driving member includes a driving electric cylinder 44 and a rotating force arm 45. The cylinder body of the driving electric cylinder 44 is fixed on the upper side of the fixed seat 2, and the output shaft of the driving electric cylinder 44 is vertically downward. The rotating force arm 45 includes a first hinged rod 451 and a second hinged rod 452. The end of the first hinged rod 451 and the end of the second hinged rod 452 are hinged. The end of the first hinged rod 451 departing from the second hinged rod 452 is hinged to the output shaft of the driving electric cylinder 44, and the end of the second hinged rod 452 is fixed to the rotating disc 42. In this embodiment, a connecting shaft is coaxially and fixedly connected to the rotating disc 42, and the end of the second hinged rod 452 is fixed to the connecting shaft and fixedly connected to the rotating disc 42 through the connecting shaft.

[0046] In actual use, the driving electric cylinder 44, the first hinged rod 451 and the second hinged rod 452 cooperate to drive the rotating disc 42 to rotate reciprocally through the connecting shaft, so as to provide a reciprocating rotational torque to the coupling. Embodiment 3

[0047] The difference between this embodiment and Embodiment 1 or Embodiment 2 is as follows: Refer to Figure 2 and Figure 5 , the control member 5 further includes a control motor 54. The control motor 54 is arranged on the side of the lead screw 52 away from the fixed seat 2, the motor housing of the control motor 54 is fixedly connected to the connecting seat 51, and the motor shaft of the control motor 54 is coaxially and fixedly connected to the lead screw 52.

[0048] Refer toFigure 6 and Figure 7 Further, the first limiting member 7 further includes a three-jaw chuck 72, a spring 73, a contact block 74, an electromagnet 75, a first airbag 76 and a second airbag 77, and the three-jaw chuck 72 is a spiral three-jaw chuck 72.

[0049] Referring to Figure 5 and Figure 6 , the chuck body of the three-jaw chuck 72 is fixedly connected to one end of the first mounting plate 61 away from the fixed seat 2. The three-jaw chuck 72 is coaxially arranged with the rotating disk 42. The jaws of the three-jaw chuck 72 are used to abut against the inner wall of the coupling. A limiting plate 721 is coaxially and fixedly connected to the outer wall of the three-jaw chuck 72. The limiting plate 721 is arranged between the jaws of the three-jaw chuck 72 and the driving port of the three-jaw chuck 72. The limiting plate 721 is used to abut against the coupling.

[0050] Referring to Figure 7 and Figure 8 , an installation groove 722 is provided on the outer wall of one jaw of the three-jaw chuck 72. One end of the spring 73 is fixedly connected to the bottom of the installation groove 722. The other end of the spring 73 is fixedly connected to the contact block 74. The contact block 74 is slidably connected to the inner wall of the installation groove 722. The contact block 74 is used to be embedded in the key groove of the coupling. The upper side of the contact block 74 is provided with a contact surface 741. The contact surface 741 is used to abut against the lower groove wall of the key groove. The lower side of the contact block 74 is provided with a limiting surface 742. The distance from the limiting surface 742 to the contact surface 741 decreases as it moves away from the spring 73. The limiting surface 742 is used to abut against the upper groove wall of the key groove. A placement groove 743 is provided on the contact surface 741. The magnet 75 is fixedly connected to the bottom of the placement groove 743. The magnet 75 is used to adsorb the coupling so that the contact surface 741 abuts against the groove wall of the key groove. The contact block 74 can adapt to key grooves of different sizes of the coupling.

[0051] One end of the contact block 74 away from the spring 73 is provided with a first air port 744. The limiting surface 742 is provided with a second air port 745. The contact block 74 has an air passage 746. Two ends of the air passage 746 are respectively communicated with the first air port 744 and the second air port 745. The mouth of the first airbag 76 is fixedly connected to the inner wall of the first air port 744. The mouth of the second airbag 77 is fixedly connected to the inner wall of the second air port 745. The second airbag 77 is used to fill the gap between the limiting surface 742 and the groove wall of the key groove and increase the friction between the limiting surface 742 and the groove wall of the key groove. One end of the contact block 74 away from the spring 73 is provided with a sliding groove 747. The sliding groove 747 is arranged on the outer periphery of the first air port 744. A sliding frame 78 is slidably connected to the mouth of the sliding groove 747. One end of the sliding frame 78 away from the bottom of the sliding groove 747 is fixedly connected to one end of the first airbag 76 away from the first air port 744.

[0052] Referring to Figure 6 , the structure of the second limiting member 9 is the same as that of the first limiting member 7.

[0053] The implementation principle of Embodiment 3 is as follows: The coupling is sleeved on the outer periphery of the three-jaw chuck 72. The three-jaw chuck 72 clamps the coupling, and the abutting block 74 is controlled to extend into the keyway, which is applicable to couplings of different specifications.

[0054] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A coupling fatigue test device, characterized in that: The invention comprises a frame (1), a fixed seat (2), a sliding seat (3), a rotating disk (42), a first mounting plate (61), a torque sensor (8) and a second mounting plate (62), wherein the fixed seat (2) is fixedly connected to the frame (1), the sliding seat (3) is slidably connected to the frame (1), the rotating disk (42) is rotatably connected to the fixed seat (2) around its own axis, the rotating axis of the rotating disk (42) is horizontal, the first mounting plate (61) is connected to one end of the rotating disk (42) facing the sliding seat (3), one end of the torque sensor (8) is fixedly connected to one end of the sliding seat (3) facing the fixed seat (2), the other end of the torque sensor (8) is fixedly connected to the second mounting plate (62), the torque sensor (8) is coaxially arranged with the rotating disk (42), and the first mounting plate (61) and the second mounting plate (62) are respectively used to fix two ends of the coupling.

2. The fatigue test device for a coupling according to claim 1, wherein: It also comprises a driving motor (43), wherein a motor housing of the driving motor (43) is fixedly connected to the fixing seat (2), and a motor shaft of the driving motor (43) is coaxially fixedly connected to the rotating disk (42).

3. The fatigue test equipment for a coupling according to claim 1, characterized in that: It also comprises a driving electric cylinder (44), the cylinder body of the driving electric cylinder (44) being fixed on the fixing seat (2), a rotating force arm (45) being connected between the output shaft of the driving electric cylinder (44) and the rotating disk (42), the rotating force arm (45) comprising a first hinged rod (451) and a second hinged rod (452), the end of the first hinged rod (451) being hinged to the end of the second hinged rod (452), the end of the first hinged rod (451) being away from the second hinged rod (452) being hinged to the output shaft of the driving electric cylinder (44), and the end of the second hinged rod (452) being fixed to the rotating disk (42).

4. A coupling fatigue test device according to claim 1, characterized in that: It also includes a connecting seat (51) and a screw rod (52), wherein the connecting seat (51) is fixedly connected to the upper end of the frame (1), and the screw rod (52) is rotatably connected to the connecting seat (51) around its own axis, and the rotation axis of the screw rod (52) is parallel to the axis of the rotating disk (42), and the sliding seat (3) is provided with a sliding opening (321), and the screw rod (52) is threadedly connected to the inner wall of the sliding opening (321).

5. The fatigue test equipment for a coupling according to claim 4, characterized in that: It also includes a hand wheel (53), wherein the hand wheel (53) is coaxially fixedly connected to the screw rod (52).

6. The fatigue test equipment for a coupling according to claim 4, characterized in that: It also comprises a control motor (54), wherein a motor housing of the control motor (54) is fixedly connected to the frame (1), and a motor shaft of the control motor (54) is coaxially fixedly connected to the screw rod (52).

7. A coupling fatigue test device according to claim 1, characterized in that: One end of the first mounting plate (61) facing away from the rotating disk (42) is fixedly connected to a first limiting member (7), and one end of the second mounting plate (62) facing away from the torque sensor (8) is fixedly connected to a second limiting member (9), the first limiting member (7) and the second limiting member (9) are coaxially arranged, the first limiting member (7) and the rotating disk (42) are coaxially arranged, and the first limiting member (7) and the second limiting member (9) are both used to limit the coupling.

8. A coupling fatigue test device according to claim 7, characterized in that: The first limiting member (7) comprises a first limiting column (71), and the second limiting member (9) comprises a second limiting column (91). The first limiting column (71) and the second limiting column (91) are coaxially arranged. The first limiting column (71) and the rotating disk (42) are coaxially arranged. The outer wall of the first limiting column (71) is fixedly connected with a first limiting key (711), and the outer wall of the second limiting column (91) is fixedly connected with a second limiting key (911). The first limiting column (71) and the second limiting column (91) are both used to extend into the coupling. The first limiting key (711) and the second limiting key (911) are both used to be embedded in the keyway of the coupling. The first mounting plate (61) and the second mounting plate (62) are respectively used to abut against two ends of the coupling.

9. The a coupling fatigue test device according to claim 7, wherein: The first limiting member (7) comprises a three-jaw chuck (72); a chuck body of the three-jaw chuck (72) is fixedly connected to an end of the first mounting plate (61) away from the fixed seat (2); the three-jaw chuck (72) is coaxially arranged with the rotating disk (42); the claws of the three-jaw chuck (72) are used to abut against the inner wall of the coupling; the outer wall of the three-jaw chuck (72) is coaxially fixedly connected to a limiting plate (721); the limiting plate (721) is arranged between the claws of the three-jaw chuck (72) and a driving port of the three-jaw chuck (72); and the limiting plate (721) is used to abut against the coupling.

10. A coupling fatigue test device according to claim 9, characterized in that: The first limiting member (7) further comprises a spring (73), an abutment block (74) and a magnet (75); an outer wall of one of the jaws of the three-jaw chuck (72) is provided with a mounting groove (722); one end of the spring (73) is fixedly connected to the bottom of the mounting groove (722); the other end of the spring (73) is fixedly connected to the abutment block (74); the abutment block (74) is slidably connected to the groove wall of the mounting groove (722); the abutment block (74) is used to be embedded in the keyway of the coupling; an upward side of the abutment block (74) is provided as an abutment surface (74 1), the abutting surface (741) is used to abut against the groove wall of the keyway facing downwards, the downward side of the abutting block (74) is set as a limiting surface (742), the distance between the limiting surface (742) and the abutting surface (741) decreases as it moves away from the spring (73), the limiting surface (742) is used to abut against the groove wall of the keyway facing upwards, the abutting surface (741) is provided with a placement groove (743), the magnet (75) is fixedly connected to the groove bottom of the placement groove (743), and the magnet (75) is used to adsorb the coupling so that the abutting surface (741) abuts against the groove wall of the keyway.

Images