Pre-positioning guide structure of multi-point elastic ball rotating shaft and use method of pre-positioning guide structure

Abstract

The invention discloses a pre-positioning guide structure of a multi-point elastic ball rotating shaft and a use method of the pre-positioning guide structure, belongs to the technical field of mechanical transmission and precise assembly, is used for mounting between the multi-point elastic ball rotating shaft and a shaft body base, and is characterized in that the guide structure is used for cooperative mounting of elastic balls on a shaft body of the multi-point elastic ball rotating shaft; the guide structure is a cylindrical structure, and guide grooves in one-to-one correspondence with the elastic balls of the multi-point elastic ball rotating shaft are formed in the inner circumferential surface of the guide structure; and each guide groove is tightened towards the central axis of the shaft body from top to bottom at the same inclination angle. The device can be assembled after being aligned, high-efficiency installation is realized, and the operation reliability of equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical transmission and precision assembly, and particularly relates to a pre-positioning guide structure of a multi-point elastic ball rotary shaft and a use method thereof. BACKGROUND

[0002] In the field of mechanical transmission and precision assembly, the multi-point elastic ball rotary shaft is a core motion component for adjusting the attitude angle, and its installation precision and efficiency directly affect the device performance and maintenance cost. The guide structure (as shown in the figure) commonly used in the installation of the multi-point elastic ball rotary shaft has the following limitations: Figure 1 (1) Complex structure: When the multi-point elastic ball rotary shaft is installed, each ball needs to be accurately aligned with the corresponding installation position and installed with force, which is tedious and requires high technical skills of the assembly personnel.

[0003] (2) Low installation efficiency: The multi-point elastic ball rotary shaft relies on manual operation or general tools for assembly, and lacks a special quick positioning device. In particular, in a narrow space or batch production scene, the installation time is significantly increased.

[0004] Therefore, the core requirement for the installation of the multi-point elastic ball rotary shaft is fast installation, which is achieved by using a special tool to realize "alignment and installation", reducing the assembly time cost; at the same time, dynamic stability is ensured to meet the synchronous adjustment of multi-point elastic support, and partial stress concentration leading to partial wear or vibration is avoided. The existing technology cannot effectively balance the above requirements, and a solution with high installation efficiency and high reliability is urgently needed. SUMMARY

[0005] Therefore, the present application provides a pre-positioning guide structure of a multi-point elastic ball rotary shaft and a use method thereof, which can be aligned and installed, achieve efficient installation, and improve the reliability of device operation.

[0006] The present application is achieved by the following technical solutions: A pre-positioning guide structure of a multi-point elastic ball rotary shaft is used for the installation between the multi-point elastic ball rotary shaft and the shaft body base, and the guide structure is used for the cooperative installation of the elastic balls on the shaft body of the multi-point elastic ball rotary shaft. The guide structure is a cylindrical structure, and the inner circumferential surface of the guide structure is provided with guide grooves corresponding to the elastic balls of the multi-point elastic ball rotary shaft. Each guide groove is tightened to the center axis of the shaft body at the same inclination angle from top to bottom.

[0007] Further, the inner diameter of the guide structure is consistent with the diameter of the shaft body mounting hole of the shaft body base.

[0008] Further, the inclination angle of each guide groove is 8.5°.​

[0009] Further, the diameter of each guide groove is greater than the ball diameter of the elastic ball, and the difference between them is not less than 1mm.

[0010] Further, the axial height of the guide structure is 2-3 times the axial height of the rotation axis of the multi-point elastic ball.

[0011] Further, the lowest point of the guide groove is 2mm above the lower end surface of the guide structure.

[0012] Further, the lower end surface of the guide structure is provided with a mounting protrusion for fixed connection with the shaft base.

[0013] A method for using a pre-positioning guide structure of a multi-point elastic ball rotary shaft, based on the guide structure, comprising the following steps: Step one, aligning and placing the elastic ball into the ball mounting hole corresponding to the shaft body; aligning the multi-point elastic ball rotary shaft with the elastic ball placed in the inner hole of the guide structure, and each elastic ball aligns with the guide groove on the guide structure; Step two, moving the shaft body downward so that the outer diameter of the shaft body with the elastic ball matches the diameter of the mounting hole of the shaft base; When the shaft body moves to the position where the elastic ball is in contact with the annular groove in the shaft base, the installation is completed.

[0014] Further, the elastic ball comprises a spring and a ball. In step one, the installation method of the elastic ball is to sequentially place the spring and the ball into the ball mounting hole corresponding to them.

[0015] Further, in step two, it also includes pulling the shaft body upward, and when the shaft body cannot move axially, the installation is completed.

[0016] Advantages: (1) The pre-positioning guide structure of a multi-point elastic ball rotary shaft is a cylindrical structure, and the inner circumferential surface is provided with guide grooves corresponding to the elastic balls of the multi-point elastic ball rotary shaft, each guide groove is tightened from top to bottom to the center axis of the shaft body at the same inclination angle; the guide structure can accurately position the position of the elastic ball, and can gradually apply uniform force to the elastic ball, thereby realizing the cooperative installation of the elastic ball, and the installation of the rotary shaft only needs to be aligned and pushed in to realize, thereby speeding up the installation efficiency.

[0017] (2) The pre-positioning guide structure of a multi-point elastic ball rotary shaft and the method thereof, the inner diameter of the guide structure is consistent with the diameter of the shaft mounting hole of the shaft base, so that the outer diameter of the rotary shaft provided with the elastic ball is finally tightened and smoothly enters the shaft mounting hole of the shaft base.

[0018] (3) The pre-positioning guide structure of a multi-point elastic ball rotary shaft and the use method thereof, the diameter of each guide groove is larger than the ball diameter of the elastic ball, and the difference between them is not less than 1 mm, so that the ball can freely roll in the guide groove, and meanwhile, the ball will not be stuck or fall off due to too large gap during assembly.

[0019] (4) The pre-positioning guide structure of a multi-point elastic ball rotary shaft and the use method thereof, the lower end face of the guide structure is provided with a mounting protrusion for fixed connection with the shaft body base, so as to realize quick pre-positioning between the guide structure and the shaft body base, thereby reducing the difficulty of manual alignment.

[0020] (5) The use method of the pre-positioning guide structure of a multi-point elastic ball rotary shaft, after the elastic ball is put into the ball mounting hole of the shaft body, the shaft body is aligned with the inner hole of the guide groove, the elastic ball is aligned with the guide groove, and then the shaft body is moved downward, so that the elastic ball abuts against the annular groove of the shaft body base, and the installation is completed; the method is simple and convenient, can speed up the work efficiency, reduce the assembly time cost, and ensure the dynamic stability.

[0021] (6) The use method of the pre-positioning guide structure of a multi-point elastic ball rotary shaft, in step one, after the spring and the ball of the elastic ball are sequentially put into the corresponding ball mounting hole, the installation operation can be performed, and no special tool is needed, which is beneficial to speed up the assembly time.

[0022] (7) The use method of the pre-positioning guide structure of a multi-point elastic ball rotary shaft, the shaft body is pulled upward, and when the shaft body cannot be moved along the axial direction, the installation is completed, thereby ensuring the reliability of the installation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the existing guide structure; Figure 2 It is a structural schematic view of the guide structure of the present application; Figure 3 It is an installation sectional view of the multi-point elastic ball rotary shaft adopting the guide structure of the present application; Figure 4 It is an installation top view of the multi-point elastic ball rotary shaft adopting the guide structure of the present application; Among them, 1-guide structure, 11-guide groove, 2-multi-point elastic ball rotary shaft, 21-shaft body, 22-elastic ball, 221-spring, 222-ball, 3-shaft body base, 31-annular groove. DETAILED DESCRIPTION

[0024] The present application will be described in detail below in combination with the drawings and examples.

[0025] Embodiment 1: The embodiment provides a pre-positioning guide structure of a multi-point elastic ball slewing shaft, as shown in the drawings, which is used for mounting a multi-point elastic ball slewing shaft 2 and a shaft body base 3. Figure 4 As shown in the drawings, the multi-point elastic ball slewing shaft 2 to be mounted (hereinafter described as a slewing shaft) comprises a shaft body 21 and elastic balls 22. As shown in the drawings, the multi-point elastic ball slewing shaft 2 to be mounted (hereinafter described as a slewing shaft) comprises a shaft body 21 and elastic balls 22. Figure 3 As shown in the drawings, the multi-point elastic ball slewing shaft 2 to be mounted (hereinafter described as a slewing shaft) comprises a shaft body 21 and elastic balls 22. The lower part of the shaft body 21 is uniformly provided with three or more ball mounting holes in the circumferential direction thereof; the axial direction of the ball mounting hole is parallel to the radial direction of the shaft body 21; in the embodiment, the ball mounting hole is preferably three. The elastic ball 22 is installed in the ball mounting hole one by one, and specifically, each elastic ball 22 comprises a ball 222 and a spring 221. The spring 221 and the ball 222 are sequentially placed in the ball mounting hole from inside to outside. The shaft body base 3 is provided with a shaft body mounting hole, and an annular groove 31 is arranged on the inner wall surface of the lower part of the shaft body mounting hole in the circumferential direction thereof. The guide structure 1 is used for guiding the slewing shaft, so that the slewing shaft enters the shaft body mounting hole, and the installation between the elastic ball 22 and the shaft body 21 is realized; after the installation is completed, the dynamic contact between the ball 222 and the surface of the shaft body 21 is realized through the spring 221 and the pre-pressure, so that the attitude angle adjustment is realized. As shown in the drawings, the guide structure 1 is a cylindrical structure, and an inner circumferential surface of the guide structure 1 is provided with a guide groove 11 corresponding to the elastic ball 22. Figure 2 The inner diameter of the guide structure 1 is consistent with the radius of the shaft body mounting hole of the shaft body base 3, the outer diameter size is determined in cooperation with the inner diameter size, so as to ensure the strength; as an example, the wall thickness of the guide structure 1 is preferably 4.5mm~5mm; the axial height of the guide structure 1 is 2~3 times of the axial height of the slewing shaft to be mounted. The inner diameter of the guide structure 1 is consistent with the radius of the shaft body mounting hole of the shaft body base 3, the outer diameter size is determined in cooperation with the inner diameter size, so as to ensure the strength; as an example, the wall thickness of the guide structure 1 is preferably 4.5mm~5mm; the axial height of the guide structure 1 is 2~3 times of the axial height of the slewing shaft to be mounted. The upper end of each guide groove 11 is flush with the upper end surface of the guide structure 1, and each guide groove 11 is tightened inwardly at the same inclination angle, that is, the guide groove 11 is tightened from top to bottom to the center axis of the shaft body 21, and the groove depth and the groove opening of the guide groove 11 are getting smaller and smaller; the arrangement of the guide groove 11 can accurately position the initial installation position of the ball 222, and can gradually apply uniform force to the ball 222, push the ball 222 into the ball mounting hole of the shaft body 21, and can be installed without using other tools, thereby saving the step of installing each ball 222 separately and speeding up the installation speed; in addition, the guide groove 11 can realize the cooperative assembly of multiple elastic balls 22, can uniformly disperse the assembly stress, and can avoid eccentric wear, thereby improving the operation reliability of the equipment; as an example, the inclination angle of the guide groove 11 (that is, the angle between the inclined surface of the groove bottom of the guide groove 11 and the center line of the guide structure 1) is preferably 8.5°, which can avoid the ball 222 from falling off during the downward movement of the shaft body 21, the diameter of each guide groove 11 is greater than the diameter of the ball 222, and the difference between them is not less than 1mm, so that the ball 222 can freely roll in the guide groove 11, while ensuring that the ball 222 will not be stuck or fall off due to excessive gap during assembly; the lowest point of the guide groove 11 is 2mm higher than the lower end surface of the guide structure 1; As an example, the lower end surface of the guide structure 1 is provided with a mounting protrusion, which is matched and installed with the mounting groove on the upper end surface of the shaft body base 3, so as to realize the rapid and predetermined positioning between the guide structure 1 and the shaft body base 3, thereby reducing the difficulty of manual alignment. The guide structure 1 in the embodiment only needs to be aligned and pushed down to complete the installation operation, which can reduce the 0.5 working hours of two people to 0.05 working hours of one person.

[0026] Embodiment 2: The embodiment provides a use method of a pre-positioning guide structure of a multi-point elastic ball rotary shaft, which is based on the guide structure 1 in embodiment 1 and includes the following steps. Step one, alignment and placement of elastic balls 22 and shaft bodies 21 The spring 221 and the ball 222 of the elastic ball 22 are sequentially aligned and placed in the ball mounting hole of the shaft body 21 of the rotary shaft corresponding thereto, and the ball 222 is located on the outer side of the spring 221; The shaft body 21 of the rotary shaft on which the spring 221 and the ball 222 are placed is vertically placed, so that the lower end of the shaft body 21 (that is, the end of the shaft body 21 close to the spring 221 and the ball 222) is downwardly aligned with the inner hole of the guide structure 1, and each ball 222 is aligned with the guide groove 11 on the guide structure 1, and the shaft body 21 is slowly placed into the inner hole of the guide structure 1; Step two, pushing and installing the shaft body 21 When the shaft body 21 moves downward, the ball 222 moves along the guide groove 11 which is tightened inward, and the spring 221 is contracted, until the outer diameter of the shaft body 21 at the lower part where the ball 222 is installed matches the diameter of the installation hole of the shaft body base 3; When the shaft body 21 moves to the annular groove 31 at the lower part of the installation hole of the base, the spring 221 pushes the ball 222 to move away from the shaft center of the shaft body 21, and the ball 222 enters the annular groove 31; at this time, the annular groove 31 axially limits the ball 222, and the shaft body 21 cannot continue to move along the axial direction; When the shaft body 21 is pulled upward, and the shaft body 21 cannot move along the axial direction, it indicates that the installation of the rotating shaft and the shaft body base 3 is completed.

[0027] To sum up, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft, used for installation between a multi-point elastic ball bearing rotary shaft (2) and a shaft base (3), characterized in that, The guide structure (1) is used for the coordinated installation of elastic balls (22) on the shaft (21) of the multi-point elastic ball rotary shaft (2); The guide structure (1) is a cylindrical structure, and its inner circumference is provided with guide grooves (11) that correspond one-to-one with the elastic balls (22) of the multi-point elastic ball rotating shaft (2). Each of the guide grooves (11) is tightened from top to bottom toward the central axis of the shaft (21) at the same angle of inclination.

2. The pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft as described in claim 1, characterized in that, The inner diameter of the guide structure (1) is consistent with the diameter of the shaft mounting hole of the shaft base (3).

3. The pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft as described in claim 1, characterized in that, The tilt angle of each of the guide slots (11) is 8.5°.

4. The pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft as described in claim 1, characterized in that, The diameter of each guide groove (11) is greater than the diameter of the ball (222) of the elastic ball (22), and the difference between the two is not less than 1 mm.

5. The pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft as described in claim 1, characterized in that, The axial height of the guide structure (1) is 2 to 3 times the axial height of the multi-point elastic ball bearing rotary shaft (2).

6. The pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft as described in claim 1, characterized in that, The lowest point of the guide groove (11) is 2mm higher than the lower end face of the guide structure (1).

7. The pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft as described in any one of claims 1-6, characterized in that, The lower end face of the guide structure (1) is provided with a mounting protrusion, which is used to fix and connect with the shaft base (3).

8. A method of using a pre-positioning guide structure for a multi-point elastic ball bearing rotary shaft, characterized in that, Based on the guiding structure of any one of claims 1-7, the method includes the following steps: Step 1: Align and insert the elastic ball (22) into the ball mounting hole of the corresponding shaft (21); Align the multi-point elastic ball bearing rotary shaft (2) into the inner hole of the guide structure (1) with the elastic ball bearing (22) inserted, and align each elastic ball bearing (22) with the guide groove (11) on the guide structure (1). Step 2: Move the shaft (21) downwards so that the outer diameter of the shaft (21) where the elastic ball (22) is installed matches the diameter of the mounting hole of the shaft base (3); The installation is completed when the shaft (21) moves to the point where the elastic ball (22) abuts against the annular groove (31) in the shaft base (3).

9. The method of using the pre-positioning guide structure of the multi-point elastic ball bearing rotary shaft as described in claim 8, characterized in that, The elastic ball (222) includes: a spring (221) and a ball (222); In step one, the installation method of the elastic ball (22) is as follows: the spring (221) and the ball (222) are placed into their corresponding ball mounting holes in sequence.

10. The method of using the pre-positioning guide structure of the multi-point elastic ball bearing rotary shaft as described in claim 8 or 9, characterized in that, Step two also includes pulling the shaft (21) upwards, and the installation is completed when the shaft (21) can no longer move along the axial direction.

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