Device and method for detecting rotation flexibility of inner and outer rings of knuckle bearing under action of torque

Abstract

The invention belongs to the technical field of mechanical assembly, and particularly relates to a device and method for detecting rotation flexibility of an inner ring and an outer ring of a knuckle bearing under the action of torque, and the device comprises a base, one side of the base is fixedly connected with a support, the support is provided with a step main shaft, one end of the step main shaft is provided with a rotation unit, and the other end is sleeved with the inner ring of the knuckle bearing. The fixing unit is matched with the first step face so that the knuckle bearing inner ring can rotate along with the step main shaft, a wheel is further rotationally arranged on the step main shaft and between the knuckle bearing inner ring and the support, a directional shaft is arranged on the wheel, and a balance weight unit connected with the wheel is arranged on the base. The inner ring and the outer circle of the knuckle bearing are ingeniously integrated with elements in the detection device through the directional shaft and the fixing unit, and when the rotating unit drives the inner ring of the knuckle bearing to rotate by one circle, whether the counterweight unit leaves the base or not is observed to judge the rotation flexibility. The torque is determined by the wheels and the counterweight unit. The device is ingenious and simple in structure, convenient and easy to manufacture and detect and low in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical assembly, and in particular relates to a device and a method for detecting the rotational flexibility of inner and outer rings of a spherical bearing under the action of torque. Background Art

[0002] Spherical bearing structure Figure 1 The rotational flexibility of the inner and outer rings of the spherical plain bearing is crucial to the overall performance of the bearing and the operation of mechanical equipment. The flexibility of the inner and outer rings of the spherical plain bearing helps to improve the bearing's load-bearing capacity, reduce friction and wear of the bearing during operation, thereby extending the service life of the bearing, and reduce vibration and noise of the bearing during operation, thereby improving the stability and reliability of the equipment.

[0003] Joystick structure see Figure 2 , joystick assembly see Figure 3 . Assembly technical requirements: After the outer ring of the spherical bearing is pressed into the joystick and the press-fitting quality is tested as required, the inner ring of the bearing is installed into the outer ring. Under the action of a torque of 0.2059N·M, the inner ring of the bearing should rotate flexibly in the outer ring of the bearing, and the inner ring should rotate one circle. Due to the particularity of the joystick structure, there is no special tooling for testing the rotational flexibility of the inner and outer rings of the spherical bearing in the assembled joystick assembly. There is no reliable testing method when assembling the joystick assembly at the production site. The rotational flexibility of the inner ring in the outer ring can only be tested by the assembler's feel, which cannot effectively, scientifically, and accurately test the rotational flexibility of the inner ring in the outer ring under the required torque, and thus there are quality risks. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for detecting the rotational flexibility of the inner and outer rings of a spherical bearing under the action of torque, so as to solve the technical problem in the prior art that the rotational flexibility of the inner ring on the outer ring cannot be effectively, scientifically and accurately detected under the required torque when assembling the joystick assembly at the production site.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The first invention is a device for detecting the rotational flexibility of the inner and outer rings of a joint bearing under the action of torque, comprising a base, a bracket fixedly connected to one side of the base, a step main shaft rotatably arranged on the bracket, a rotating unit arranged at one end of the step main shaft, and a joint bearing inner ring sleeved on the other end, one side of the joint bearing inner ring is in contact with a first step surface on the step main shaft, and a fixing unit is arranged on the other side, the fixing unit cooperates with the first step surface so that the joint bearing inner ring can rotate with the step main shaft, a wheel is also rotatably arranged on the step main shaft between the joint bearing inner ring and the bracket, an orientation shaft is arranged on the end face of the wheel close to the joint bearing inner ring, the orientation shaft sleeve is arranged in the joystick, one end of the counterweight unit is also connected to the wheel, and the other end of the counterweight unit is arranged on the base.

[0006] Preferably, a first through hole is provided on the side wall of the bracket, a threaded hole is provided on the top, a bushing is interference fitted in the first through hole, the step spindle is rotatably set on the bracket through the bushing, and a "V"-shaped groove is provided circumferentially on the step spindle located in the bushing, a second through hole is provided on the bushing, the second through hole is opposite to the threaded hole of the bracket and the "V"-shaped groove of the step spindle, a set screw is provided in the threaded hole, and the lower end of the set screw is adapted to the "V"-shaped groove to prevent axial movement of the step spindle.

[0007] Preferably, the rotating unit comprises a wrench, one end of which is fixedly connected to the step spindle via a cylindrical pin, and the other end of which is provided with a handle.

[0008] Preferably, the fixing unit comprises a shoulder nut and a fixing washer, one side of the fixing washer contacts the end face of the inner ring of the spherical bearing, and the other side contacts the shoulder nut, and the shoulder nut cooperates with the first step surface to position the inner ring of the spherical bearing.

[0009] Preferably, the outer diameter of the fixing washer is larger than the inner diameter of the inner ring of the spherical plain bearing, and smaller than the outer diameter of the inner ring of the spherical plain bearing.

[0010] Preferably, the diameter of the first step surface is larger than the inner diameter of the inner ring of the spherical plain bearing and smaller than the outer diameter of the inner ring of the spherical plain bearing.

[0011] Preferably, the counterweight unit includes a counterweight block, which is placed on the base. A guide hole is provided at the bottom of the counterweight block, in which a guide shaft fixed to the base is arranged, and a first threading hole is provided at the top of the counterweight block, in which a rope fixedly connected to the wheel is arranged.

[0012] Preferably, the wheel is arranged on the stepped spindle via a bearing.

[0013] The second invention is a method for detecting the rotation flexibility of the inner and outer rings of a spherical bearing under the action of torque, using any of the above-mentioned devices, the method comprising: S1: Install the joystick assembly on the device so that the inner ring of the spherical bearing is sleeved on the step spindle and the joystick is sleeved on the directional shaft; S2: The rotating unit rotates one circle, driving the step spindle and the inner ring of the spherical bearing to rotate, and observing the counterweight unit. If the counterweight unit leaves the end face of the base, the rotation flexibility is unqualified. If the counterweight unit does not leave the end face of the base, the rotation flexibility is qualified.

[0014] Preferably, a second threading hole is provided on the wheel, and the specific detection torque is determined by the distance from the second threading hole to the center of the wheel and the weight of the counterweight.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present application discloses a device for detecting the rotation flexibility of the inner and outer rings of a spherical bearing under the action of a torque. Considering the structural characteristics of the joystick assembly, the inner ring and outer circle of the spherical bearing are cleverly integrated with the components in the detection device through the directional shaft and the fixed unit. When the rotating unit rotates one circle, that is, the inner ring of the spherical bearing rotates one circle, the rotation flexibility of the inner and outer rings of the spherical bearing is judged by observing whether the counterweight unit leaves the end face of the base. The magnitude of a certain torque is determined by the design of the wheel and the counterweight unit. The device structure is designed as a mechanical structure, which is ingenious and simple in structure, easy to manufacture and detect, and low in cost. It has been verified by the use of the production site that the measurement is stable and reliable, and the operation is convenient, which ensures the detection of the flexibility of the inner ring of the spherical bearing rotating one circle in the outer ring of the bearing under the action of a certain torque. It solves the quality risk of there being no reliable detection method when assembling the joystick assembly at the production site, and only relying on the assembler's hand feeling to detect the rotation flexibility of the inner ring in the outer ring, thereby improving the assembly quality of the spherical bearing. The design principle, method and device structure of this invention have certain promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is the structural diagram of the spherical plain bearing; Figure 2 This is the structure diagram of the joystick; Figure 3 is a structural diagram of the joystick assembly; Figure 4 It is a schematic diagram of the device structure of the present invention.

[0018] Among them: 1- bracket; 2- wrench; 3- bushing; 4- step spindle; 401- first step surface 5- wheel; 6- fixing washer; 7- shoulder nut; 8- directional shaft; 9- counterweight; 10- guide shaft; 11- set screw; 12- cylindrical pin; 13- bearing; 14- handle; 15- rope; 16- base; 17- joystick; 18- spherical bearing; 1801- spherical bearing inner ring; 1802- spherical bearing outer ring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 4The present application discloses a device for detecting the rotational flexibility of the inner and outer rings of a spherical bearing under the action of a torque, comprising a base 16, a bracket 1 being fixedly connected to one side of the base 16, a step spindle 4 being rotatably arranged on the bracket 1, a rotating unit being arranged at one end of the step spindle 4, and a spherical bearing inner ring 1801 being sleeved on the other end, one side of the spherical bearing inner ring 1801 being in contact with a first step surface 401 on the step spindle 4, and a fixing unit being arranged at the other side, the fixing unit being matched with the first step surface 401 so that the spherical bearing inner ring 1801 can rotate with the step spindle 4, a wheel 5 is also rotatably arranged on the step spindle 4 between the spherical bearing inner ring 1801 and the bracket 1, an orientation shaft 8 is arranged on the end face of the wheel 5 close to the spherical bearing inner ring 1801, the orientation shaft 8 is sleeved in the joystick, one end of the counterweight unit is also connected to the wheel 5, and the other end of the counterweight unit is arranged on the base 16. The inner ring and outer circle of the joint bearing are ingeniously integrated with the components in the detection device through the orientation shaft 8 and the fixing unit. When the rotating unit rotates one circle, that is, the inner ring 1801 of the joint bearing rotates one circle, the rotation flexibility of the inner ring 1801 and the outer ring of the joint bearing is judged by observing whether the counterweight unit leaves the end surface of the base. The size of a certain torque is determined by the design of the wheel and the counterweight unit. The technical problem that the rotation flexibility of the inner ring on the outer ring cannot be effectively, scientifically and accurately detected under the required torque when assembling the joystick assembly at the production site in the prior art is solved.

[0026] A method for detecting the rotation flexibility of inner and outer rings of a spherical plain bearing under torque, comprising: S1: Install the joystick assembly on the device so that the inner ring of the spherical bearing 1801 is sleeved on the step spindle 4, and the joystick is sleeved on the directional shaft 8; S2: The rotating unit rotates one circle, driving the step main shaft 4 and the inner ring 1801 of the spherical bearing to rotate, and observing the counterweight unit. If the counterweight unit leaves the end face of the base 16, the rotation flexibility is unqualified. If the counterweight unit does not leave the end face of the base 16, the rotation flexibility is qualified.

[0027] In some embodiments, a first through hole is provided on the side wall of the bracket 1, and a threaded hole is provided on the top. A bushing 3 is interference fitted in the first through hole. The step spindle 4 is rotatably set on the bracket 1 through the bushing 3, and a "V"-shaped groove is provided circumferentially on the step spindle 4 located in the bushing 3. A second through hole is provided on the bushing 3, and the second through hole is opposite to the threaded hole of the bracket 1 and the "V"-shaped groove of the step spindle 4. A set screw 11 is provided in the threaded hole, and the lower end of the set screw 11 is adapted to the "V"-shaped groove to prevent axial movement of the step spindle 4.

[0028] A method for detecting the rotation flexibility of inner and outer rings of a spherical plain bearing under torque, comprising: S1: Install the joystick assembly on the device so that the inner ring of the spherical bearing 1801 is sleeved on the step spindle 4, and the joystick is sleeved on the directional shaft 8; S2: The rotating unit rotates one circle, driving the step main shaft 4 to rotate one circle in the bushing 3, and then driving the inner ring 1801 of the spherical bearing to rotate, and observing the counterweight unit. If the counterweight unit leaves the end face of the base 16, the rotation flexibility is unqualified. If the counterweight unit does not leave the end face of the base 16, the rotation flexibility is qualified.

[0029] In some embodiments, the rotating unit includes a wrench 2, one end of which is fixed to the step spindle 4 through a cylindrical pin 12, and the other end is provided with a handle 14. The setting of the rotating unit can simply and effectively control the step spindle 4 to rotate one circle, meeting the detection requirements.

[0030] A method for detecting the rotation flexibility of inner and outer rings of a spherical plain bearing under torque, comprising: S1: Install the joystick assembly on the device so that the inner ring of the spherical bearing 1801 is sleeved on the step spindle 4, and the joystick is sleeved on the directional shaft 8; S2: The handle 14 drives the wrench 2 to rotate one circle, thereby driving the step spindle 4 and the inner ring 1801 of the spherical bearing to rotate, and observing the counterweight unit. If the counterweight unit leaves the end face of the base 16, the rotation flexibility is unqualified. If the counterweight unit does not leave the end face of the base 16, the rotation flexibility is qualified.

[0031] In some embodiments, the fixing unit includes a shoulder nut 7 and a fixing washer 6, one side of the fixing washer 6 contacts the end surface of the spherical bearing inner ring 1801, and the other side contacts the shoulder nut 7, and the shoulder nut 7 cooperates with the first step surface 401 to position the spherical bearing inner ring 1801. The structure is simple, and it cooperates with the first step surface to effectively realize the positioning of the spherical bearing inner ring 1801, and it is easy to disassemble and convenient for the installation of the joystick assembly.

[0032] In some embodiments, the outer diameter of the fixed washer 6 is larger than the inner diameter of the joint bearing inner ring 1801 and smaller than the outer diameter of the joint bearing inner ring 1801. The size of the fixed washer 6 ensures effective positioning of the joint bearing inner ring 1801 and does not wear the joint bearing outer ring 1802. It is a key component for the device to realize its function.

[0033] In some embodiments, the diameter of the first step surface 401 is larger than the inner diameter of the spherical bearing inner ring 1801 and smaller than the outer diameter of the spherical bearing inner ring 1801 , thereby ensuring effective positioning of the spherical bearing inner ring 1801 and not wearing the spherical bearing outer ring 1802 .

[0034] In some embodiments, the counterweight unit includes a counterweight block 9, which is placed on a base 16. A guide hole is provided at the bottom of the counterweight block 9, in which a guide shaft 10 fixedly connected to the base 16 is provided, and a first threading hole is provided at the top of the counterweight block 9, in which a rope 15 fixedly connected to the wheel 5 is provided. The counterweight block 9 moves up and down along the guide shaft 10 to ensure that a precise specific torque is provided and the accuracy of the test results is ensured. The counterweight block 9 can be used to adjust the mass of the counterweight block 9 according to the actual working conditions, and cooperate with the wheel 5, as long as the torque required for the test can be obtained, the device has strong applicability.

[0035] A method for detecting the rotation flexibility of inner and outer rings of a spherical bearing under torque, comprising: S1: Install the joystick assembly on the device so that the inner ring of the spherical bearing 1801 is sleeved on the step spindle 4, and the joystick is sleeved on the directional shaft 8; S2: The rotating unit rotates one circle, driving the step main shaft 4 and the inner ring of the spherical bearing 1801 to rotate, and observing the counterweight block 9. If the counterweight block 9 leaves the end surface of the base 16, the rotation flexibility is unqualified. If the counterweight block 9 does not leave the end surface of the base 16, the rotation flexibility is qualified.

[0036] In some embodiments, the wheel 5 is arranged on the step spindle 4 through a bearing 13. The rotation flexibility of the wheel 5 is ensured to provide a guarantee for the detection accuracy of the device.

[0037] [Example] See also Figure 4 After the outer ring 1802 of the spherical bearing is press-fitted into the joystick 17 and the press-fitting quality is tested as required, the inner ring 1801 of the bearing is installed into the outer ring 1802 of the spherical bearing. At this time, the joystick 17 is equipped with the spherical bearing 18. The inner hole of the inner ring 1801 of the spherical bearing is inserted into the step spindle 4, and the clearance between the minimum step outer circle of the step spindle 4 and the inner hole of the inner ring of the spherical bearing is matched. Figure 4The first step surface 401 adjacent to the right side of the smallest step outer circle of the middle step spindle 4 locates one end face of the joint bearing inner ring 1801, and at the same time, the hole in the measured part joystick assembly parallel to the hole for installing the joint bearing outer ring 1802 is inserted into the directional pin 8 according to the clearance fit, and then the fixing washer 6 is in contact with the other end face of the joint bearing inner ring 1801, and the shoulder nut 7 is tightened, so that the joint bearing inner ring 1801 in the joystick assembly is fixed. At this time, the joint bearing inner ring 1801, the step spindle 4, the fixing washer 6, the shoulder nut 7, the wrench 2, the cylindrical pin 12, and the handle 14 become one body, and when the handle 14 is turned, if there is no external force obstruction, the above-mentioned integration will be linked. The inner hole of the bearing 13 and the step spindle 4 are clearance fit (the clearance is 0.005mm~0.01mm), and the outer circle of the bearing 13 and the wheel 5 are interference fit. The bushing 3 is designed with a through hole for the set screw 11. The set screw 11 contacts the "V" groove of the step spindle 4 to prevent the axial movement of the step spindle 4. The counterweight block 9 needs to be marked with the counterweight weight, and the method of removing the metal on the surface is allowed to ensure the weight. The counterweight block 9 is designed with a guide hole and a threading hole. The counterweight block 9 is installed on the guide shaft 10 through the guide hole clearance fit and is firmly attached to the end face of the base 16; the rope 15 (nylon line and other light and strong ropes can be used) is connected to the wheel 5 through the threading hole of the counterweight block 9. The wheel 5 structure is designed with a second threading hole of Ф2, and the distance between the second threading hole and the center of the wheel is L. The outer ring 1802 of the joint bearing and the joystick 17 are interference fit after being pressed, so that the outer ring 1802 of the joint bearing, the joystick 17, the wheel 5, the bearing 13, the counterweight block 9, and the rope 15 are integrated. When the handle 14 (the handle 14 is connected to the wrench 2 through a thread) is rotated one circle, the inner ring 1801 of the spherical bearing rotates with the step main shaft 4 (the step main shaft 4 rotates in the clearance between the bushing 3 and the bearing 13). When the counterweight 9 leaves the end face of the base 16, under a certain torque, the rotation flexibility of the inner ring 1801 of the spherical bearing on the outer ring 1802 of the spherical bearing is unqualified. Otherwise, the flexibility is qualified.

[0038] Directions: When the handle 14 is rotated one circle (the rotation direction is along the direction in which the counterweight 9 leaves the end face of the base 16), when the counterweight 9 leaves the end face of the base 16, the rotation flexibility of the spherical bearing inner ring 1801 in the spherical bearing outer ring 1802 is unqualified; conversely, when the counterweight 9 cannot leave the end face of the base 16, the spherical bearing inner ring 1801 rotates flexibly in the spherical bearing outer ring 1802.

[0039] Example of torque calculation: The special device is designed with a given counterweight weight of 700g, and the distance L between the second threading hole on the wheel 5 and the wheel center is 30mm. 700g = 0.7kg ≈ 6.86N; 30mm = 0.03m Torque calculation: 6.86N×0.03m=0.2058N·M In summary, the design principle of the device for detecting the rotation flexibility of the inner and outer rings of the joint bearing under the action of torque disclosed in the present application is correct, the concept is novel, and the structural characteristics of the joystick assembly are taken into consideration. The inner ring and outer circle of the joint bearing are cleverly integrated with the components in the detection device. When the handle is turned one circle, that is, the inner ring of the joint bearing rotates one circle, the rotation flexibility of the inner and outer rings of the joint bearing is judged by observing whether the counterweight leaves the end face of the bracket. The magnitude of a certain torque is determined by the design of the wheel and the counterweight. The structure of this detection device is designed as a mechanical structure, which is ingenious and simple in structure, easy to manufacture and detect, and has low cost. It has been verified by the use of the production site that the measurement is stable and reliable, and the operation is convenient, which ensures the detection of the flexibility of the inner ring of the joint bearing rotating one circle in the outer ring of the bearing under the action of a certain torque. It solves the quality risk of there being no reliable detection method when assembling the joystick assembly at the production site, and only relying on the assembler's hand feeling to detect the rotation flexibility of the inner ring in the outer ring, thereby improving the assembly quality of the joint bearing. The design principle, method and device structure of this invention have certain promotional value.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for detecting the rotation flexibility of inner and outer rings of a spherical bearing under torque, characterized in that: The invention comprises a base (16), one side of the base (16) is fixedly connected to a bracket (1), a step spindle (4) is rotatably arranged on the bracket (1), one end of the step spindle (4) is provided with a rotating unit, and the other end is sleeved with a joint bearing inner ring (1801), one side of the joint bearing inner ring (1801) is in contact with a first step surface (401) on the step spindle (4), and the other side is provided with a fixing unit, the fixing unit cooperates with the first step surface (401) so that the joint bearing inner ring (1801) can rotate with the step spindle (4), a wheel (5) is rotatably arranged on the step spindle (4) between the joint bearing inner ring (1801) and the bracket (1), an orientation shaft (8) is arranged on the end surface of the wheel (5) close to the joint bearing inner ring (1801), the orientation shaft (8) is sleeved in the joystick, one end of the counterweight unit is also connected to the wheel (5), and the other end of the counterweight unit is arranged on the base (16).

2. The device for detecting the rotational flexibility of the inner and outer rings of a spherical plain bearing under torque according to claim 1, characterized in that: The bracket (1) has a first through hole on its side wall and a threaded hole on its top. A bushing (3) is interference-fitted in the first through hole. The step spindle (4) is rotatably arranged on the bracket (1) via the bushing (3). A "V"-shaped groove is circumferentially arranged on the step spindle (4) located in the bushing (3). The bushing (3) has a second through hole, the second through hole facing the threaded hole of the bracket (1) and the "V"-shaped groove of the step spindle (4). A set screw (11) is arranged in the threaded hole. The lower end of the set screw (11) is adapted to fit the "V"-shaped groove to prevent the step spindle (4) from axial movement.

3. The device for detecting the rotational flexibility of inner and outer rings of spherical plain bearings under torque according to claim 1, characterized in that: The rotating unit comprises a wrench (2), one end of the wrench (2) is fixedly connected to the step main shaft (4) via a cylindrical pin (12), and the other end is provided with a handle (14).

4. The device for detecting the rotational flexibility of inner and outer rings of spherical plain bearings under torque according to claim 1, characterized in that: The fixing unit comprises a shoulder nut (7) and a fixing washer (6); one side of the fixing washer (6) contacts the end face of the spherical bearing inner ring (1801), and the other side contacts the shoulder nut (7); the shoulder nut (7) cooperates with the first step surface (401) to position the spherical bearing inner ring (1801).

5. The device for detecting the rotational flexibility of the inner and outer rings of a spherical plain bearing under the action of torque according to claim 4 is characterized in that: The outer diameter of the fixing washer (6) is larger than the inner diameter of the spherical bearing inner ring (1801) and smaller than the outer diameter of the spherical bearing inner ring (1801).

6. The device for detecting the rotational flexibility of inner and outer rings of spherical plain bearings under torque according to claim 1, characterized in that: The diameter of the first step surface (401) is larger than the inner diameter of the spherical bearing inner ring (1801) and smaller than the outer diameter of the spherical bearing inner ring (1801).

7. The device for detecting the rotational flexibility of inner and outer rings of spherical plain bearings under torque according to claim 1, characterized in that: The counterweight unit comprises a counterweight block (9), the counterweight block (9) being placed on a base (16), a guide hole being provided at the bottom of the counterweight block (9), a guide shaft (10) being fixedly connected to the base (16) being provided in the guide hole, and a first threading hole being provided at the top of the counterweight block (9), a rope (15) being fixedly connected to the wheel (5) being provided in the first threading hole.

8. The device for detecting the rotational flexibility of inner and outer rings of spherical plain bearings under torque according to claim 1, characterized in that: The wheel (5) is arranged on the step spindle (4) via a bearing (13).

9. A method for detecting the rotational flexibility of inner and outer rings of a spherical bearing under torque, characterized in that: Using the device according to any one of claims 1 to 8, the method comprises: S1: Install the joystick assembly on the device so that the inner ring of the spherical bearing (1801) is sleeved on the step spindle (4) and the joystick is sleeved on the orientation shaft (8); S2: The rotating unit rotates one circle, driving the step spindle (4) and the inner ring of the spherical bearing (1801) to rotate, and the counterweight unit is observed. If the counterweight unit leaves the end surface of the base (16), the rotation flexibility is unqualified. If the counterweight unit does not leave the end surface of the base (16), the rotation flexibility is qualified.

10. The method for detecting the rotational flexibility of inner and outer rings of a spherical plain bearing under torque according to claim 9, characterized in that: The wheel (5) is provided with a second threading hole, and the specific detection torque is determined by the distance from the second threading hole to the center of the wheel (5) and the weight of the counterweight (9).

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