Bearing seat auxiliary assembly device and bearing seat

By using auxiliary assembly devices of positioning parts, limiting mechanisms and pressing assembly mechanisms during bearing seat assembly, the problems of low assembly accuracy and easy damage in the prior art are solved, and a more efficient and accurate assembly process is achieved. .

CN119458233APending Publication Date: 2025-02-18CHANGGAO ELECTRIC GROUP CO LTD +1
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Patent Information

Application Number
CN202411595714.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-11
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

In the prior art, the bearing seat assembly method relies on the naked eye to judge the accuracy and is prone to damage the bearings and bushings.

Method used

A bearing seat auxiliary assembly device is provided, including a mounting support, a position limiting mechanism and a pressing assembly mechanism. The bottom end of the mounting support has a positioning part for the shaft sleeve positioning and installation, and the limiting mechanism is used to assist the limit of the bearing in the horizontal direction. The pressing assembly mechanism slowly presses downwards through the movable pressing part to complete the assembly.

Benefits of technology

Through the combination of positioning part, limiting mechanism and compression assembly mechanism, the accuracy and efficiency of bearing seat assembly are improved, and the damage to bearings and bushings caused by human error is avoided.

✦ Generated by Eureka AI based on patent content.

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Abstract

The bearing pedestal auxiliary assembly device comprises an installation support, a limiting mechanism and a pressing assembly mechanism, the bottom end of the installation support is provided with a positioning part, the positioning part is used for positioning and installing a shaft sleeve of the bearing pedestal, the first end of the limiting mechanism is connected to the middle of the installation support, and the second end of the limiting mechanism is provided with a limiting space; the limiting space is used for allowing a bearing of the bearing seat to penetrate through, the second end of the limiting mechanism is arranged in an openable and closable mode, the pressing and assembling mechanism is connected to the top of the mounting support and provided with a press-fitting part which is movably arranged in the vertical direction, and the press-fitting part is arranged above the bearing of the bearing seat. In this way, the shaft sleeve can be installed and fixed through the positioning part and prevented from loosening when pressed into the bearing, auxiliary limiting can be conducted on the bearing in the horizontal direction through the limiting mechanism so that the situation that the precision is affected due to deviation caused by stress when the bearing is pressed into the bearing can be avoided, then the bearing is slowly pressed into the bearing downwards through the pressing and assembling mechanism, assembling of the bearing seat is completed, operation is convenient and fast, and efficiency is high.
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Description

Technical Field

[0001] The invention relates to the technical field of isolating switch bearing seat assembly, in particular to a bearing seat auxiliary assembly device and a bearing seat. Background Art

[0002] A high-voltage disconnector is a switching device that has an insulation distance that meets the specified requirements and an obvious disconnection mark between the contacts when in the open position; when in the closed position, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time. The disconnector is equipped with a sleeve or bearing at the shaft position.

[0003] In the position where the isolating switch needs to rotate, that is, where there is a rotating shaft, bearings or sleeves will be installed. Their main function is to support the mechanical rotating body and to reduce the components that fix and reduce the load friction coefficient of the equipment during the transmission process; that is, when other parts move relative to each other on the shaft, they are used to reduce the friction coefficient during power transmission and keep the center position of the shaft fixed. Therefore, bearings and sleeves play a vital and irreplaceable role in mechanical design.

[0004] The existing production process generally considers manual assembly and relies on the assembly staff's visual judgment and bench work to adjust the bearing and sleeve assembly process. The product quality cannot be guaranteed to be basically consistent, and it is too dependent on the production experience of the employees. At the same time, due to the reliance on wooden hammers or other tools to adjust the position of the workpiece, it is inevitable that it cannot be in place in one go. The actual production process is inefficient, which is not conducive to the promotion of assembly methods and is also prone to damage bearings and sleeves.

[0005] In view of this, it is necessary to propose a bearing seat auxiliary assembly device and a bearing seat to solve or at least alleviate the above defects. Summary of the invention

[0006] The main purpose of the present invention is to provide a bearing seat auxiliary assembly device to solve the problem that the bearing seat assembly method in the prior art relies on visual judgment with poor accuracy and is easy to damage the bearing and the sleeve.

[0007] To achieve the above-mentioned purpose, the present invention provides a bearing seat auxiliary assembly device, comprising a mounting support, a limiting mechanism and a pressing assembly mechanism; wherein:

[0008] The bottom end of the mounting support has a positioning portion, and the positioning portion is used for positioning and installing the shaft sleeve of the bearing seat;

[0009] The first end of the limiting mechanism is connected to the middle part of the mounting support, the second end of the limiting mechanism has a limiting space, the limiting space is used for the bearing of the bearing seat to pass through, and the second end of the limiting mechanism can be opened and closed;

[0010] The pressing and assembling mechanism is connected to the top of the mounting support, and the pressing and assembling mechanism has a pressing part which is movably arranged in the vertical direction, and the pressing part is arranged above the bearing of the bearing seat.

[0011] Preferably, the positioning portion is a positioning groove formed by a depression at the bottom of the mounting support, and a threaded hole is provided on the positioning groove.

[0012] Preferably, the limiting mechanism includes a connecting rod, a first limiting hoop block and a second limiting hoop block, the first limiting hoop block and the second limiting hoop block both being semicircular opening shapes, the first end of the connecting rod being connected to the middle part of the mounting support, the first limiting hoop block being connected to the second end of the connecting rod, the first limiting hoop block being respectively provided with a first blind hole and a second blind hole at both ends along the radial direction, the first end of the second limiting hoop block being hinged in the first blind hole through a pin shaft and being vertically movably arranged, the second end of the second limiting hoop block being protruding downward to form a limiting rod, and the limiting rod being inserted into the second blind hole so that the first limiting hoop block and the second limiting hoop block are combined to form the limiting space.

[0013] Preferably, the pressing assembly mechanism includes a mounting block, the pressing part is a rack and a gear, the mounting block is connected to the top of the mounting support, the mounting block has a slideway extending vertically, the rack is slidably connected to the slideway, and a pressing rod is protruding downward from the bottom of the rack, ear plates are protruding on both sides of the mounting block, the gear shaft of the gear is rotatably installed in the ear plates, and the gear and the rack are meshingly arranged.

[0014] Preferably, the press-fitting rod is arranged coaxially with the bearing of the bearing seat.

[0015] Preferably, the bottom end of the press-fitting rod is arranged in a curved shape.

[0016] Preferably, the diameter of the limiting space is 35 mm to 45 mm.

[0017] Preferably, the mounting support comprises a base plate and an L-shaped support, the base plate is recessed to form the positioning groove, the first end of the connecting rod is connected to the vertical section of the L-shaped support, and the mounting block is connected to the horizontal section of the L-shaped support.

[0018] Preferably, the pressing assembly mechanism further includes an adjusting handle, and the adjusting handle is fixedly connected to the gear shaft of the gear.

[0019] The present application also provides a bearing seat, including a bearing and a sleeve, wherein the bearing is rotatably connected to the sleeve, and also includes the bearing seat auxiliary assembly device as described above, wherein the sleeve is connected to the positioning part of the bearing seat auxiliary assembly device, the bearing passes through the limiting space of the limiting mechanism of the bearing seat auxiliary assembly device, and the pressing part of the pressing assembly mechanism of the bearing seat auxiliary assembly device is arranged above the bearing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a bearing seat auxiliary assembly device, including a mounting support, a limiting mechanism and a pressing assembly mechanism. The bottom end of the mounting support has a positioning portion, the positioning portion is used for positioning and installing the sleeve of the bearing seat, the first end of the limiting mechanism is connected to the middle of the mounting support, the second end of the limiting mechanism has a limiting space, the limiting space is used for the bearing of the bearing seat to pass through, and the second end of the limiting mechanism can be opened and closed, the pressing assembly mechanism is connected to the top of the mounting support, the pressing assembly mechanism has a pressing portion that can be movably arranged in the vertical direction, and the pressing portion is arranged above the bearing of the bearing seat. In this way, the sleeve can be installed and fixed by the positioning portion to prevent loosening when the bearing is pressed in, and the bearing can be auxiliary limited in the horizontal direction by the limiting mechanism to avoid displacement due to force when the bearing is pressed in, which affects the accuracy, and then the bearing is slowly pressed downward by the pressing assembly mechanism to complete the assembly of the bearing seat, which is convenient to operate and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A three-dimensional schematic diagram of an application scenario of the overall structure in one embodiment of the present invention;

[0024] Figure 2 An exploded schematic diagram of a limiting mechanism in one embodiment of the present invention;

[0025] Figure 3 is a three-dimensional schematic diagram of a compression assembly mechanism in one embodiment of the present invention;

[0026] Figure 4 It is a plan view of a closed limiting mechanism in one embodiment of the present invention.

[0027] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0028] Description of Figure Numbers:

[0029] 10. Mounting support; 110. Bottom plate; 111. Positioning portion; 120. L-shaped support; 20. Limiting mechanism; 210. Connecting rod; 220. First limiting hoop block; 221. First blind hole; 222. Second blind hole; 230. Second limiting hoop block; 231. Pin; 232. Limiting rod; 240. Limiting space; 30. Pressing assembly mechanism; 310. Mounting block; 311. Slideway; 320. Pressing portion; 321. Rack; 322. Gear; 323. Pressing rod; 330. Adjusting handle; 40. Bearing seat; 410. Bearing; 420. Bushing. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Please see attached Figure 1-4In one embodiment of the present invention, a bearing seat auxiliary assembly device is provided, including an installation support 10, a limiting mechanism 20 and a clamping assembly mechanism 30. First of all, it should be noted that, unlike the prior art which generally considers manual assembly and relies on the assembly staff's visual judgment and benchwork to adjust the bearing 410 and the sleeve 420 assembly process, the product quality cannot be guaranteed to be basically consistent, and it is too dependent on the production experience of the employees. At the same time, due to the reliance on a wooden hammer or other tools to adjust the workpiece position, it is inevitable that the workpiece cannot be put in place in one go, which leads to low efficiency in the actual production process, is not conducive to the promotion of the assembly method, and is also prone to damage the bearing 410 and the sleeve 420. The present application solves the above-mentioned defects in the prior art by providing a bearing seat auxiliary assembly device, as follows:

[0035] The bottom end of the mounting support 10 has a positioning portion 111, and the positioning portion 111 is used for positioning and installing the sleeve 420 of the bearing seat 40; the first end of the limiting mechanism 20 is connected to the middle part of the mounting support 10, and the second end of the limiting mechanism 20 has a limiting space 240, and the limiting space 240 is used for the bearing 410 of the bearing seat 40 to pass through, and the second end of the limiting mechanism 20 can be opened and closed; the clamping assembly mechanism 30 is connected to the top of the mounting support 10, and the clamping assembly mechanism 30 has a pressing portion 320 that can be movably arranged in the vertical direction, and the pressing portion 320 is arranged above the bearing 410 of the bearing seat 40.

[0036] Specifically, the bearing seat auxiliary assembly device in the present application includes a mounting support 10, a limiting mechanism 20 and a clamping assembly mechanism 30. The mounting support 10 is used for the installation of the limiting mechanism 20 and the clamping assembly mechanism 30. At the same time, a positioning portion 111 is also provided at the bottom end of the mounting support 10 for positioning and installing the shaft sleeve 420 of the bearing seat 40 to improve the stability during assembly; the limiting mechanism 20 plays an auxiliary role in limiting the bearing 410 of the bearing seat 40 in the horizontal direction to prevent the deviation caused by pressing down the bearing 410 and improve the assembly accuracy, so the limiting mechanism The second end of the limiting mechanism 20 has a limiting space 240 for the bearing 410 to pass through, and the second end of the limiting mechanism 20 can be opened and closed for easy installation. When opened, it is convenient for the bearing 410 to be installed, and when closed, a limiting space 240 is formed for limiting. The pressing and assembling mechanism 30 is used to press the bearing 410 downward, and the pressing part 320 that is movable vertically is controlled to move downward to squeeze the bearing 410 when it contacts the bearing 410, thereby slowly pressing the bearing 410 into the sleeve 420 to complete the assembly. Therefore, the pressing part 320 needs to be arranged above the bearing 410 of the bearing seat 40.

[0037] As a preferred embodiment of the present invention, the positioning portion 111 is a positioning groove formed by a depression at the bottom of the mounting support 10 , and a threaded hole is formed on the positioning groove.

[0038] It should be noted that the positioning groove is used for positioning and installing the sleeve 420 of the bearing seat 40, so that the sleeve 420 and the entire mounting support 10 are connected as one, thereby increasing the integrity of the connection and improving the stability. A threaded hole is opened on the positioning groove, and the threaded hole corresponds to the hole on the sleeve 420 of the bearing seat 40, so that the positioning connection is carried out by screw connection, which is quick to connect and easy to disassemble and assemble.

[0039] As a preferred embodiment of the present invention, the limiting mechanism 20 includes a connecting rod 210, a first limiting hoop block 220 and a second limiting hoop block 230, the first limiting hoop block 220 and the second limiting hoop block 230 both being semicircular opening shapes, the first end of the connecting rod 210 being connected to the middle part of the mounting support 10, the first limiting hoop block 220 being connected to the second end of the connecting rod 210, the first limiting hoop block 220 being respectively provided with a first blind hole 221 and a second blind hole 222 at two radial ends, the first end of the second limiting hoop block 230 being hinged in the first blind hole 221 through a pin shaft 231 and being vertically movably arranged, the second end of the second limiting hoop block 230 being protruded downward to form a limiting rod 232, the limiting rod 232 being inserted into the second blind hole 222, so that the first limiting hoop block 220 and the second limiting hoop block 230 are enclosed to form the limiting space 240.

[0040] It should be noted that the connecting rod 210 is used for the installation of the first limiting hoop block 220, and the first limiting hoop block 220 is extended to the position of the bearing 410. The first limiting hoop block 220 and the second limiting hoop block 230 are both used to limit the displacement of the bearing 410 in the horizontal direction. Therefore, the first limiting hoop block 220 and the second limiting hoop block 230 are both semicircular openings to enclose a circular limiting space 240 for matching with the bearing 410; wherein the first blind hole 221 and the second blind hole 222 respectively opened at the two ends of the first limiting hoop block 220 in the radial direction are both used for the connection of the second limiting hoop block 230, and the first blind hole 221 is used for the first limiting hoop block 220 and the second limiting The positioning hoop block 230 is hinged by a pin shaft 231, so that the second end of the second limiting hoop block 230 can rotate around its first end to achieve the effect of opening and closing setting, and the limiting rod 232 formed by the downward protrusion of the second end of the second limiting hoop block 230 is used to be inserted in the second blind hole 222, thereby forming a closure to ensure the limiting effect. Therefore, the first end of the second limiting hoop block 230 is movably arranged vertically, so that the second limiting hoop block 230 is slightly lifted when rotating, and when the limiting rod 232 of the second limiting hoop block 230 rotates to the second blind hole 222, the second limiting hoop block 230 is pressed down so that the limiting rod 232 is inserted in the second blind hole 222 to complete the limiting effect on the bearing 410.

[0041] As a preferred embodiment of the present invention, the clamping assembly mechanism 30 includes a mounting block 310, the pressing part 320 is a rack 321 and a gear 322, the mounting block 310 is connected to the top of the mounting support 10, the mounting block 310 has a slide 311 extending vertically, the rack 321 is slidably connected to the slide 311, and the bottom of the rack 321 is protruding downward to form a pressing rod 323, and the two sides of the mounting block 310 are protruding to form ear plates, the gear shaft of the gear 322 is rotatably installed in the ear plates, and the gear 322 and the rack 321 are meshingly arranged.

[0042] It is worth noting that the mounting block 310 is used for mounting the press-fitting portion 320. In the present application, the press-fitting portion 320 adopts a combination of a rack 321 and a gear 322. The slideway 311 of the mounting block 310 is used for mounting the rack 321, so that the rack 321 is slidably arranged in the vertical direction, and a press-fitting rod 323 is convexly formed at the bottom end of the rack 321. When the rack 321 moves, the press-fitting rod 323 is driven to move, thereby achieving the effect of pressing down the bearing 410. The gear 322 is rotatably mounted on the ear plate of the mounting block 310, and the gear 322 and the rack 321 are meshed with each other. The gear 322 is driven to rotate to drive the rack 321 to move so as to move up and down. In a preferred embodiment of the present application, an adjusting handle 330 can be installed to be connected to the gear shaft of the gear 322, so that the rotation of the gear 322 can be achieved by rotating the adjusting handle 330. In this way, the force and speed can be manually adjusted during assembly, and the assembly process can be controlled.

[0043] As a preferred embodiment of the present invention, the press rod 323 is arranged coaxially with the bearing 410 of the bearing seat 40 .

[0044] It is worth noting that the coaxial centerline setting can facilitate uniform force when pressing down, and will not cause eccentric force, so as to avoid damage to the bearing 410.

[0045] Furthermore, the bottom end of the press rod 323 is arranged in a curved shape.

[0046] It should be noted that the curved surface can reduce angular surfaces, so that the contact surface between the press rod 323 and the bearing 410 is smooth, thereby reducing damage to the bearing 410 when pressing down.

[0047] Furthermore, the diameter of the limiting space 240 is 35 mm to 45 mm.

[0048] It should be understood that the size of the limit space 240 can be determined according to the commonly used size of the bearing 410. In a preferred embodiment, the diameter of the limit space 240 can be set to 35mm~45mm, preferably, it can be set to 40mm. Those skilled in the art can set it according to actual needs.

[0049] Furthermore, the mounting support 10 includes a base plate 110 and an L-shaped support 120 , the base plate 110 is recessed to form the positioning groove, the first end of the connecting rod 210 is connected to the vertical section of the L-shaped support 120 , and the mounting block 310 is connected to the horizontal section of the L-shaped support 120 .

[0050] It should be noted that the base plate 110 is used for positioning and installing the sleeve 420, and the positioning groove is formed in a recessed manner therein; and the structure of the L-shaped support 120 can utilize its horizontal section to extend the mounting block 310 to the top of the bearing 410, thereby facilitating the alignment of the rack 321 and the press rod 323 on the mounting block 310 with the bearing 410.

[0051] The present application also provides a bearing seat 40, including a bearing 410 and a sleeve 420, wherein the bearing 410 is rotatably connected to the sleeve 420, and also includes the bearing seat auxiliary assembly device as described above, wherein the sleeve 420 is connected to the positioning portion 111 of the bearing seat auxiliary assembly device, the bearing 410 passes through the limiting space 240 of the limiting mechanism 20 of the bearing seat auxiliary assembly device, and the pressing portion 320 of the pressing assembly mechanism 30 of the bearing seat auxiliary assembly device is arranged above the bearing 410.

[0052] It can be understood that the sleeve 420 can be installed in the positioning portion 111 by means of bolt connection, which is convenient for disassembly and assembly, and the bearing 410 passes through the limiting space 240 for auxiliary limiting, so that the displacement is limited to the vertical direction, which greatly improves the installation accuracy. Combined with the pressing assembly mechanism 30 to press down, it saves time and effort and is more efficient.

[0053] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A bearing seat auxiliary assembly device, characterized in that: It includes a mounting support, a limiting mechanism and a pressing assembly mechanism; wherein, The bottom end of the mounting support has a positioning portion, and the positioning portion is used for positioning and installing the shaft sleeve of the bearing seat; The first end of the limiting mechanism is connected to the middle part of the mounting support, the second end of the limiting mechanism has a limiting space, the limiting space is used for the bearing of the bearing seat to pass through, and the second end of the limiting mechanism can be opened and closed; The pressing and assembling mechanism is connected to the top of the mounting support, and the pressing and assembling mechanism has a pressing and assembling portion which is movably arranged in the vertical direction, and the pressing and assembling portion is arranged above the bearing of the bearing seat.

2. The bearing seat auxiliary assembly device according to claim 1, characterized in that: The positioning portion is a positioning groove formed by a depression at the bottom of the mounting support, and a threaded hole is provided on the positioning groove.

3. The bearing seat auxiliary assembly device according to claim 2, characterized in that: The limiting mechanism includes a connecting rod, a first limiting hoop block and a second limiting hoop block, the first limiting hoop block and the second limiting hoop block both being semicircular opening shapes, the first end of the connecting rod being connected to the middle part of the mounting support, the first limiting hoop block being connected to the second end of the connecting rod, the first limiting hoop block being respectively provided with a first blind hole and a second blind hole at both ends along the radial direction, the first end of the second limiting hoop block being hinged in the first blind hole through a pin shaft and being vertically movably arranged, the second end of the second limiting hoop block being protruded downward to form a limiting rod, and the limiting rod being inserted in the second blind hole so that the first limiting hoop block and the second limiting hoop block are combined to form the limiting space.

4. The bearing seat auxiliary assembly device according to claim 3, characterized in that: The pressing assembly mechanism includes a mounting block, the pressing part is a rack and a gear, the mounting block is connected to the top of the mounting support, the mounting block has a slideway extending vertically, the rack is slidably connected to the slideway, and a pressing rod is protruding downward from the bottom of the rack, ear plates are protruding on both sides of the mounting block, the gear shaft of the gear is rotatably installed in the ear plates, and the gear and the rack are meshingly arranged.

5. The bearing seat auxiliary assembly device according to claim 4, characterized in that: The press-fitting rod is arranged coaxially with the bearing of the bearing seat.

6. The bearing seat auxiliary assembly device according to claim 4, characterized in that: The bottom end of the press rod is arranged in a curved shape.

7. The bearing seat auxiliary assembly device according to claim 1, characterized in that: The diameter of the limiting space is 35 mm to 45 mm.

8. The bearing seat auxiliary assembly device according to claim 4, characterized in that: The mounting support includes a base plate and an L-shaped support, the base plate is recessed to form the positioning groove, the first end of the connecting rod is connected to the vertical section of the L-shaped support, and the mounting block is connected to the horizontal section of the L-shaped support.

9. The bearing seat auxiliary assembly device according to claim 4, characterized in that: The pressing assembly mechanism also includes an adjusting handle, and the adjusting handle is fixedly connected to the gear shaft of the gear.

10. A bearing seat, comprising a bearing and a sleeve, wherein the bearing is rotatably connected through the sleeve, and wherein: It also includes the bearing seat auxiliary assembly device as described in any one of claims 1 to 9, the sleeve is connected to the positioning part of the bearing seat auxiliary assembly device, the bearing passes through the limiting space of the limiting mechanism of the bearing seat auxiliary assembly device, and the pressing part of the pressing assembly mechanism of the bearing seat auxiliary assembly device is arranged above the bearing.