A rocker automatic return to center device and design method

Abstract

The present invention belongs to the technical field of aerial work equipment, and discloses a rocker automatic centering device and a design method. The rocker automatic centering device includes: a fixed seat, provided with a through hole and an annular groove, the annular groove is concentric with the through hole, and the bottom of the annular groove is an arc shape; a rocker body, which is penetrated in the through hole and is installed with a spacer ring; a wear-resistant sleeve, which is sleeved on the rocker body, and the bottom of the wear-resistant sleeve is in contact with the bottom of the annular groove; a centering spring, which is sleeved on the rocker body, and the two ends are respectively against the wear-resistant sleeve and the spacer ring; the rocker body includes an initial position and a maximum deflection position, and the centering spring is used to drive the rocker body to switch from the maximum deflection position to the initial position; a connecting assembly, which is installed on the fixed seat and hinged with the rocker body, and the connecting assembly is used to ensure that when the rocker body is in the initial position, the central axis of the rocker body coincides with the center line of the through hole. The rocker automatic centering device according to the embodiment of the present invention has a simple structure and good stability, and can ensure the rapid and accurate centering of the rocker body.

Description

Technical Field

[0001] The invention relates to the technical field of aerial work equipment, and in particular to an automatic centering device for a rocker arm and a design method thereof. Background Art

[0002] Aerial work vehicles are used as equipment to transport personnel, materials and tools to designated locations for operations. They are widely used due to their flexibility, efficiency and safety. As the market demand for aerial work vehicles increases, the requirements for the joysticks of the control handles of aerial work vehicles are getting higher and higher. However, the joysticks of the control handles of aerial work vehicles on the market currently have a large mid-position gap, which causes occasional non-return to the center, thus affecting the reliability of motion control and the stability of the boom, and easily causing invalid operations and joystick damage. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a rocker automatic return device, which can ensure the rapid and accurate return of the rocker body, thereby reducing invalid operations, extending the service life of the rocker body, and improving the reliability of motion control and the stability of the arm.

[0004] The present invention also provides a design method for the automatic centering device of the rocker.

[0005] The rocker automatic centering device according to the first embodiment of the present invention comprises:

[0006] A fixing seat, provided with a through hole penetrating the fixing seat, an annular groove is provided on the outer periphery of the through hole, the annular groove is concentric with the through hole; the bottom of the annular groove is in an arc shape;

[0007] A rocker body is inserted into the through hole; a spacer ring is installed on the rocker body, and the diameter of the spacer ring is larger than the diameter of the rocker body;

[0008] A wear-resistant sleeve is sleeved on the rocker body and installed in the annular groove; the bottom of the wear-resistant sleeve is in contact with the bottom of the annular groove;

[0009] a return spring, sleeved on the rocker body, the two ends of the return spring respectively abutting against the wear-resistant sleeve and the spacer ring; the rocker body includes an initial position and a maximum deflection position, and the return spring is used to drive the rocker body to switch from the maximum deflection position to the initial position;

[0010] A connecting component is installed below the fixing seat, the rocker body is hinged to the connecting component, and the connecting component is used to limit the rocker body so that when the rocker body is in an initial position, the central axis of the rocker body coincides with the central line of the through hole.

[0011] The automatic centering device of the rocker according to the embodiment of the present invention has at least the following beneficial effects:

[0012] By setting the bottom of the annular groove to an arc shape and making the bottom of the wear-resistant sleeve fit with the bottom of the annular groove, the structure is simple, and the mid-position gap can be effectively reduced, thereby reducing the probability of the rocker body occasionally not returning to the center. The return spring is used to resist the wear-resistant sleeve to provide power for the rocker body to return to the center. The structure is simple and the stability is good, which can ensure the rapid and accurate return of the rocker body and reduce invalid operations, thereby extending the service life of the rocker body and improving the reliability of motion control and the stability of the arm.

[0013] According to some embodiments of the present invention, the groove bottom includes an inner groove wall close to the through hole and an outer groove wall away from the through hole, and the height of the inner groove wall in the vertical direction is smaller than the height of the outer groove wall in the vertical direction.

[0014] According to some embodiments of the present invention, the top end of the inner groove wall smoothly transitions to the through hole.

[0015] According to some embodiments of the present invention, the outer groove wall protrudes toward the through hole, and the outer side wall of the wear-resistant sleeve abuts against the outer groove wall.

[0016] According to some embodiments of the present invention, the rocker body comprises a first diameter section and a second diameter section, the diameter of the first diameter section being greater than the diameter of the second diameter section;

[0017] The spacer ring is installed on the first diameter section, and the second diameter section is penetrated through the through hole.

[0018] According to some embodiments of the present invention, a limit platform is provided at the top of the wear-resistant sleeve, and the return spring is sleeved on the outer periphery of the limit platform;

[0019] The diameter of the limiting platform is equal to the inner diameter of the coil of the centering spring, and the diameter of the limiting platform is greater than the diameter of the first diameter section.

[0020] According to some embodiments of the present invention, the wear-resistant sleeve is made of an elastic material, and the fixing seat is made of a rigid material.

[0021] According to some embodiments of the present invention, the connecting assembly includes a first rotating structure and a second rotating structure, the first rotating structure and the second rotating structure are both rotatably mounted on the fixing seat around their own axes, and the rotating axis of the first rotating structure is perpendicular to the rotating axis of the second rotating structure;

[0022] The connecting assembly further includes a first connecting structure and a second connecting structure, wherein the first connecting structure is connected to the fixing seat and is used to limit the two ends of the first rotating structure; the second connecting structure is connected to the fixing seat and is used to limit the two ends of the second rotating structure;

[0023] The rocker body passes through the first rotating structure and the second rotating structure, and the rocker body is hinged to the first rotating structure or the second rotating structure.

[0024] According to some embodiments of the present invention, the second rotating structure is provided with a slot, and the first rotating structure is installed in the slot;

[0025] A first through hole penetrating through the first rotating structure is provided in the middle of the first rotating structure, a second through hole penetrating through the second rotating structure is provided in the middle of the second rotating structure, and the rocker body passes through the first through hole and the second through hole in sequence.

[0026] The design method according to the second aspect of the present invention is used to design the above-mentioned rocker automatic return to center device, including:

[0027] The rocker body includes an initial position and a maximum deflection position, and the rocker body in the initial position is in a vertical state;

[0028] The initial axial length of the return spring is X0; when the rocker body is in the initial position, the first axial length of the return spring is X1;

[0029] The optimal initial thrust range value when pushing the rocker body to switch from the initial position to the maximum deflection position is F1 to F2, wherein F2>F1;

[0030] The design method is:

[0031] When the rocker body is in the initial position, the reverse force N2 applied by the fixing seat to the wear-resistant sleeve is obtained, the first distance L1 from the top of the rocker body to the hinge of the rocker body and the connecting assembly is obtained, and the second distance L2 from the hinge of the rocker body and the connecting assembly to the bottom of the annular groove is obtained;

[0032] Assume that the initial thrust for driving the rocker body is N1;

[0033] According to N1*L1-N2*L2=0, the initial thrust N1 is obtained;

[0034] If F1≤N1≤F2, the rocker automatic return to center device meets the design requirements;

[0035] When the rocker body is in the initial position, the method for obtaining the reverse force N2 applied by the fixing seat to the wear-resistant sleeve is:

[0036] Obtaining the stiffness coefficient k of the return spring;

[0037] When the rocker body is in the initial position, the preload force applied by the return spring to the wear-resistant sleeve to the fixing seat is assumed to be F0, and the reverse force applied by the fixing seat to the wear-resistant sleeve is assumed to be N2;

[0038] According to F0=k(X0-X1), N2=F0;

[0039] Obtain the reaction force N2.

[0040] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0042] Figure 1 It is a front view of the rocker automatic centering device according to an embodiment of the present invention;

[0043] Figure 2 A cross-sectional view of an automatic centering device for a rocker according to an embodiment of the present invention;

[0044] Figure 3 It is a schematic diagram of the assembly of the automatic centering device of the rocker according to an embodiment of the present invention;

[0045] Figure 4 for Figure 3 Cross-sectional view of the fixing seat.

[0046] Figure Number:

[0047] The fixing seat 100, the through hole 110, the annular groove 120, the inner groove wall 121, and the outer groove wall 122;

[0048] Rocker body 200, first diameter section 201, second diameter section 202, spacer ring 210, locking structure 211;

[0049] Wear-resistant sleeve 300, limit table 310;

[0050] Return spring 400;

[0051] The connecting assembly 500 , the first rotating structure 510 , the first through hole 511 , the second rotating structure 520 , the second through hole 521 , the slot 522 , the first connecting structure 530 , and the second connecting structure 540 . DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0054] In the description of the present invention, "a plurality" means more than two. If there is a description of "a first", "a second" is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0055] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0056] Reference Figures 1 to 4The rocker automatic centering device of the embodiment of the present invention comprises a fixing seat 100, a rocker body 200, a spacer ring 210, a wear-resistant sleeve 300, a centering spring 400 and a connecting assembly 500. The fixing seat 100 is provided with a through hole 110 penetrating the fixing seat 100, and an annular groove 120 is provided on the outer periphery of the through hole 110. The annular groove 120 is concentric with the through hole 110. The rocker body 200 is penetrated through the through hole 110, and the spacer ring 210 is installed on the rocker body 200, and the diameter of the spacer ring 210 is larger than the diameter of the rocker body 200. The wear-resistant sleeve 300 is sleeved on the rocker body 200 and installed in the annular groove 120. The return spring 400 is sleeved on the rocker body 200, and the two ends of the return spring 400 are respectively against the wear-resistant sleeve 300 and the spacer ring 210; the rocker body 200 includes an initial position and a maximum deflection position, and the return spring 400 is used to drive the rocker body 200 to switch from the maximum deflection position to the initial position; the connecting assembly 500 is installed below the fixing seat 100, and the rocker body 200 is hinged with the connecting assembly 500, and the connecting assembly 500 is used to limit the rocker body 200, so that when the rocker body 200 is in the initial position, the central axis of the rocker body 200 coincides with the central line of the through hole 110. The return spring 400 is pressed against the wear-resistant sleeve 300 to provide the power for the rocker body 200 to return to the center, which has a simple structure and good stability, can ensure the rapid and accurate return of the rocker body 200, reduce invalid operations, thereby extending the service life of the rocker body 200, and improving the reliability of motion control and the stability of the arm.

[0057] Furthermore, the bottom of the annular groove 120 is arc-shaped, and the bottom of the wear-resistant sleeve 300 is in contact with the bottom of the annular groove 120. The arc-shaped bottom structure of the annular groove 120 can significantly reduce the friction resistance when the wear-resistant sleeve 300 and the annular groove 120 move relative to each other; the force applied by the return spring 400 to the wear-resistant sleeve 300 is along the axial direction of the rocker body 200. Therefore, when the rocker body 200 is in the maximum deflection position, the force of the return spring 400 to drive the rocker body 200 back to the center is a component force. In order to ensure that the component force can also drive the rocker body 200 back to the center, it is necessary to reduce the friction resistance when the wear-resistant sleeve 300 and the annular groove 120 move relative to each other, so as to facilitate the return of the rocker body 200. In addition, the bottom of the annular groove 120 is processed into an arc shape, and the bottom of the wear-resistant sleeve 300 is processed into an arc shape that fits the bottom of the annular groove 120. The processing difficulty is low, the structure is simple, and the processing cost can be effectively reduced. The bottom of the wear-resistant sleeve 300 is in surface contact with the bottom of the annular groove 120, which can effectively reduce the center gap and reduce the probability of occasional non-return to center problems of the rocker body 200.

[0058] In the embodiment of the present invention, the spacer ring 210 is not fixedly mounted on the rocker body 200, but is sleeved on the rocker body 200. A locking structure 211 is mounted on the rocker body 200. The locking structure 211 is mounted on the end of the spacer ring 210 away from the return spring 400 to limit the end position of the spacer ring 210. Figure 3 As shown, the locking structure 211 in this embodiment is a retaining ring.

[0059] It is conceivable that the spacer ring 210 can also be connected to the rocker body 200 by fasteners, for example, the spacer ring 210 is fixed to the set position of the rocker body 200 by bolts. The spacer ring 210 is limited to the end of the stroke by a retaining ring. After long-term use, when the elasticity of the return spring 400 deteriorates and the axial length of the return spring 400 becomes shorter, the spacer ring 210 may shake or slide along the axial direction of the rocker body 200 under the elastic action of the return spring 400, so that the spacer ring 210 is easy to disassemble and replace.

[0060] In the embodiment of the present invention, the groove bottom includes an inner groove wall 121 close to the through hole 110 and an outer groove wall 122 away from the through hole 110, and the height of the inner groove wall 121 in the vertical direction is less than the height of the outer groove wall 122 in the vertical direction. Figure 4 As shown, the inner groove wall 121 is set to have a height in the vertical direction that is smaller than the height of the outer groove wall 122 in the vertical direction, which can facilitate the installation of the wear-resistant sleeve 300 and prevent the wear-resistant sleeve 300 from easily detaching from the annular groove 120 when the rocker body 200 switches between the initial position and the maximum deflection position. In addition, the height of the inner groove wall 121 in the vertical direction is smaller than the height of the outer groove wall 122 in the vertical direction, which can effectively reduce the contact area between the inner groove wall 121 and the wear-resistant sleeve 300, thereby reducing the resistance caused by the inner groove wall 121 to the rocker body 200 when the rocker body 200 switches from the initial position to the maximum deflection position.

[0061] It should be noted that the height of the inner groove wall 121 in the vertical direction should not be too low. It should be ensured that when the rocker body 200 is in the maximum swing position, the raised portion of the bottom of the wear-resistant sleeve 300 is still in contact with the inner groove wall 121, and preferably, the raised portion of the bottom of the wear-resistant sleeve 300 is in contact with the top of the inner groove wall 121, thereby reducing the resistance of driving the rocker body 200 to switch between the initial position and the maximum swing position.

[0062] In the embodiment of the present invention, the top of the inner groove wall 121 smoothly transitions to the through hole 110; the outer groove wall 122 protrudes toward the through hole 110, and the outer wall of the wear-resistant sleeve 300 abuts against the outer groove wall 122. Figure 2 , Figure 4As shown, the top of the inner groove wall 121 is set to smoothly transition to the through hole 110 in order to reduce the resistance of driving the rocker body 200 to switch between the initial position and the maximum deflection position; accordingly, the outer side wall is set to bulge toward the through hole 110 in order to facilitate driving the rocker body 200 back to the center. The wear-resistant sleeve 300 is set to be cylindrical, which can reduce the processing cost. The outer groove wall 122 is an arc surface and arches toward the through hole 110. Therefore, the greater the deflection angle of the rocker body 200, the greater the force of the outer groove wall 122 on the wear-resistant sleeve 300 will be, so that the rocker body 200 is easy to reset.

[0063] It is conceivable that the specific shape of the wear-resistant sleeve 300 can also be modified accordingly according to actual conditions.

[0064] In the embodiment of the present invention, the wear-resistant sleeve 300 is made of elastic material, and the fixing seat 100 is made of rigid material. Specifically, the wear-resistant sleeve 300 is preferably made of rubber, plastic and other materials, and has a certain elastic deformation ability, so that the rocker body 200 can be easily returned to the center; the fixing seat 100 is preferably made of metal material, which is convenient for processing structures such as the ring groove 120.

[0065] In the embodiment of the present invention, the rocker body 200 includes a first diameter section 201 and a second diameter section 202, wherein the diameter of the first diameter section 201 is larger than the diameter of the second diameter section 202; the spacer ring 210 is mounted on the first diameter section 201, and the second diameter section 202 is inserted into the through hole 110. Specifically, the first diameter section 201 and the second diameter section 202 are preferably connected as an integral structure to ensure that the rocker body 200 has sufficient structural strength and is easy to process. The second diameter section 202 with a smaller diameter is inserted into the through hole 110, which can simultaneously reduce the volume of the fixing seat 100, thereby facilitating the reduction of the overall volume and weight of the rocker automatic centering device, so as to facilitate carrying and operation.

[0066] Furthermore, in an embodiment of the present invention, a limit platform 310 is provided at the top of the wear-resistant sleeve 300, and the return spring 400 is sleeved on the outer periphery of the limit platform 310; the diameter of the limit platform 310 is equal to the inner diameter of the coil of the return spring 400, and the diameter of the limit platform 310 is greater than the diameter of the first diameter section 201. Specifically, the diameter of the limit platform 310 is equal to the inner diameter of the coil of the return spring 400, so that during the swinging process of the rocker body 200, the end of the return spring 400 that abuts against the limit platform 310 will not be displaced in the radial direction of the rocker body 200; but since the diameter of the limit platform 310 is larger than the diameter of the first diameter section 201, during the swinging process of the rocker body 200, the end of the return spring 400 that abuts against the spacer ring 210 will be displaced in the radial direction of the rocker body 200, that is, during the swinging process of the rocker body 200, the return spring 400 will not only be compressed but also bend, so that part of the return spring 400 contacts the outer peripheral wall of the rocker body 200, and the return spring 400 simultaneously applies axial and radial forces to the rocker body 200, thereby facilitating the rapid return of the rocker body 200.

[0067] In an embodiment of the present invention, the spacer ring 210 is installed on the first diameter section 201. Therefore, when the return-to-center spring 400 bends with the swing of the rocker body 200, the end of the return-to-center spring 400 that abuts against the spacer ring 210 can only contact the first diameter section 201. The diameter of the first diameter section 201 is larger than the diameter of the second diameter section 202. Therefore, the first diameter section 201 limits the maximum bending angle of the return-to-center spring 400, thereby avoiding the return-to-center spring 400 from bending at too large an angle to affect the structural strength and service life.

[0068] In an embodiment of the present invention, the connection assembly 500 includes a first rotating structure 510 and a second rotating structure 520. The first rotating structure 510 and the second rotating structure 520 are both installed on the fixed seat 100 so as to rotate around their own axes, and the rotation axis of the first rotating structure 510 is perpendicular to the rotation axis of the second rotating structure 520. The connection assembly 500 also includes a first connecting structure 530 and a second connecting structure 540. The first connecting structure 530 is connected to the fixed seat 100 and is used to limit the two ends of the first rotating structure 510. The second connecting structure 540 is connected to the fixed seat 100 and is used to limit the two ends of the second rotating structure 520. The rocker body 200 passes through the first rotating structure 510 and the second rotating structure 520, and the rocker body 200 is hinged to the first rotating structure 510 or the second rotating structure 520. Specifically, refer to Figure 3 As shown, there are two first connection structures 530 , which are respectively used to fix the two ends of the first rotating structure 510 ; there are also two second connection structures 540 , which are respectively used to fix the two ends of the second rotating structure 520 .

[0069] In the embodiment of the present invention, the second rotating structure 520 is provided with a slot 522, and the first rotating structure 510 is installed in the slot 522; the first rotating structure 510 is provided with a first through hole 511 penetrating the first rotating structure 510 in the middle, and the second rotating structure 520 is provided with a second through hole 521 penetrating the second rotating structure 520 in the middle, and the rocker body 200 passes through the first through hole 511 and the second through hole 521 in sequence. Figure 3 As shown, since the first rotating structure 510 is installed in the slot 522 of the second rotating structure 520, it is preferred that the rocker body 200 is hinged to the first rotating structure 510 so that the rocker body 200 can swing at a larger angle.

[0070] The design method of the second embodiment of the present invention is used to design the above-mentioned rocker automatic return to center device, including:

[0071] The initial axial length of the return spring 400 is X0; when the rocker body 200 is in the initial position, the first axial length of the return spring 400 is X1;

[0072] The optimal initial thrust range value when pushing the rocker body 200 to switch from the initial position to the maximum deflection position is from F1 to F2, wherein F2>F1;

[0073] The design method is:

[0074] Reference Figure 2 As shown, when the rocker body 200 is in the initial position, the reverse force N2 applied by the fixing seat 100 to the wear-resistant sleeve 300 is obtained, the first distance L1 from the top of the rocker body 200 to the hinge of the rocker body 200 and the connecting assembly 500 is obtained, and the second distance L2 from the hinge of the rocker body 200 and the connecting assembly 500 to the bottom of the annular groove 120 is obtained;

[0075] Assume that the initial thrust for pushing the rocker body 200 to move is N1;

[0076] According to N1*L1-N2*L2=0, the initial thrust N1 is obtained;

[0077] If F1≤N1≤F2, the joystick automatic return to center device meets the design requirements;

[0078] When the rocker body 200 is in the initial position, the method for obtaining the reverse force N2 applied by the fixing seat 100 to the wear-resistant sleeve 300 is:

[0079] Obtain the stiffness coefficient k of the return spring 400;

[0080] When the rocker body 200 is in the initial position, the preload force applied by the return spring 400 to push the wear-resistant sleeve 300 to the fixing seat 100 is assumed to be F0, and the reverse force applied by the fixing seat 100 to the wear-resistant sleeve 300 is assumed to be N2;

[0081] According to F0=k(X0-X1), N2=F0, the reverse force N2 is obtained.

[0082] Specifically, the initial axial length X0 of the return spring 400 and the first axial length X1 of the return spring 400 can be obtained by direct measurement; the optimal initial thrust range value when pushing the rocker body 200 to switch from the initial position to the maximum deflection position is F1 to F2, which is obtained from experience and is preferably 3N to 5N, F1=3N, F2=5N.

[0083] Furthermore, the stiffness coefficient k of the return spring 400 is obtained by the elastic modulus of the spring material, the wire diameter of the spring, the coil diameter and the number of coils. The standard spring can refer to the relevant standard data; since the acquisition of the stiffness coefficient k of the spring is a conventional technical means, it will not be elaborated here.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0085] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A rocker automatic return to center device, characterized in that: include: A fixing seat, provided with a through hole penetrating the fixing seat, an annular groove is provided on the outer periphery of the through hole, the annular groove is concentric with the through hole; the bottom of the annular groove is in an arc shape; A rocker body is inserted into the through hole; a spacer ring is installed on the rocker body, and the diameter of the spacer ring is larger than the diameter of the rocker body; A wear-resistant sleeve is sleeved on the rocker body and installed in the annular groove; the bottom of the wear-resistant sleeve is in contact with the bottom of the annular groove; a return spring, sleeved on the rocker body, the two ends of the return spring respectively abutting against the wear-resistant sleeve and the spacer ring; the rocker body includes an initial position and a maximum deflection position, and the return spring is used to drive the rocker body to switch from the maximum deflection position to the initial position; A connecting assembly is installed below the fixing seat, the rocker body is hinged to the connecting assembly, and the connecting assembly is used to limit the rocker body so that when the rocker body is in an initial position, the central axis of the rocker body coincides with the central line of the through hole; Wherein, the groove bottom includes an inner groove wall close to the through hole and an outer groove wall away from the through hole, the height of the inner groove wall in the vertical direction is smaller than the height of the outer groove wall in the vertical direction; the outer groove wall protrudes toward the through hole, and the outer side wall of the wear-resistant sleeve abuts against the outer groove wall.

2. The rocker automatic return to center device according to claim 1, characterized in that: The top end of the inner groove wall smoothly transitions to the through hole.

3. The rocker automatic return to center device according to claim 1, characterized in that: The rocker body comprises a first diameter section and a second diameter section, wherein the diameter of the first diameter section is greater than the diameter of the second diameter section; The spacer ring is installed on the first diameter section, and the second diameter section is penetrated through the through hole.

4. The rocker automatic return to center device according to claim 3, characterized in that: A limit platform is provided at the top of the wear-resistant sleeve, and the return spring is sleeved on the outer periphery of the limit platform; The diameter of the limiting platform is equal to the inner diameter of the coil of the centering spring, and the diameter of the limiting platform is greater than the diameter of the first diameter section.

5. The rocker automatic return to center device according to claim 1, characterized in that: The wear-resistant sleeve is made of elastic material, and the fixing seat is made of rigid material.

6. The rocker automatic return-to-center device according to claim 1, characterized in that: The connecting assembly comprises a first rotating structure and a second rotating structure, wherein the first rotating structure and the second rotating structure are both rotatably mounted on the fixing seat around their own axes, and the rotating axis of the first rotating structure is perpendicular to the rotating axis of the second rotating structure; The connecting assembly further comprises a first connecting structure and a second connecting structure, wherein the first connecting structure is connected to the fixing seat and is used to limit the two ends of the first rotating structure; The second connecting structure is connected to the fixing seat and is used to limit the two ends of the second rotating structure; The rocker body passes through the first rotating structure and the second rotating structure, and the rocker body is hinged to the first rotating structure or the second rotating structure.

7. The rocker automatic centering device according to claim 6, characterized in that: The second rotating structure is provided with a slot, and the first rotating structure is installed in the slot; A first through hole penetrating through the first rotating structure is provided in the middle of the first rotating structure, a second through hole penetrating through the second rotating structure is provided in the middle of the second rotating structure, and the rocker body passes through the first through hole and the second through hole in sequence.

8. A design method for designing the rocker automatic return-to-center device according to any one of claims 1 to 7, characterized in that: The rocker body includes an initial position and a maximum deflection position, and the rocker body in the initial position is in a vertical state; The initial axial length of the return spring is X0; when the rocker body is in the initial position, the first axial length of the return spring is X1; The optimal initial thrust range value when pushing the rocker body to switch from the initial position to the maximum deflection position is F1 to F2, wherein F2>F1; The design method is: When the rocker body is in the initial position, the reverse force N2 applied by the fixing seat to the wear-resistant sleeve is obtained, the first distance L1 from the top of the rocker body to the hinge of the rocker body and the connecting assembly is obtained, and the second distance L2 from the hinge of the rocker body and the connecting assembly to the bottom of the annular groove is obtained; Assume that the initial thrust for driving the rocker body is N1; According to N1*L1-N2*L2=0, the initial thrust N1 is obtained; If F1≤N1≤F2, the rocker automatic return to center device meets the design requirements; When the rocker body is in the initial position, the method for obtaining the reverse force N2 applied by the fixing seat to the wear-resistant sleeve is: Obtaining the stiffness coefficient k of the return spring; When the rocker body is in the initial position, the preload force applied by the return spring to the wear-resistant sleeve to the fixing seat is assumed to be F0, and the reverse force applied by the fixing seat to the wear-resistant sleeve is assumed to be N2; According to F0=k(X0-X1), N2=F0; Obtain the reaction force N2.

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