Assembly tool for middle shaft assembly

Abstract

The present invention relates to the technical field of central axis assembly, and provides an assembly tool for a central axis component, wherein the assembly tool for the central axis component includes a base, a primary telescopic component, and a secondary telescopic component, wherein the central axis can be fixed to the base and the axial direction of the central axis is parallel to a first direction; the primary telescopic component includes a first driving member and a support plate, the first driving member is installed on the base, and the first driving member can adjust the distance between the support plate and the base along the first direction; the secondary telescopic component includes a second driving member and an extrusion member, the second driving member is installed on the support plate, and the second driving member can drive the extrusion member to extrude the torque sensor toward one side of the base along the first direction. In this way, the assembly tool can realize the automation of the assembly process of the central axis and the torque sensor, reduce manual participation, improve the operation quality, maintain the consistency of the operation quality, and thus improve the product yield.

Description

Technical Field

[0001] The invention relates to the technical field of central shaft assembly, and in particular to an assembly tool for a central shaft component. Background Art

[0002] The mid-axle torque sensor is a sensor used in electric bicycles or high-end bicycles. It is installed at the mid-axle position of the bicycle to measure the torque applied by the rider when pedaling. It is one of the core components of the electric bicycle power assist system, which can achieve precise power assist control and improve the riding experience.

[0003] Since the controller of the electric bicycle needs to adjust the output power of the motor according to the feedback signal of the torque sensor, there are certain requirements for the measurement accuracy of the torque sensor. In addition to the factory settings of the torque sensor itself, the assembly accuracy of the torque sensor and the middle shaft directly affects its measurement accuracy.

[0004] During the assembly process, the torque sensor is mounted on the center shaft and is tightened to the center shaft by axial extrusion along the center shaft to complete the assembly. Under existing working conditions, this step is usually done manually. Due to the characteristics of the torque sensor and the small clearance between parts during manual operation, manual tools are required to manually press the parts to ensure the assembly accuracy of the parts. However, manual operation is unstable and cannot meet the quality requirements of full-quality products in production operations.

[0005] Therefore, there is an urgent need for an assembly tool for a middle shaft assembly to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to propose an assembly tool for a central shaft assembly, which can realize the automation of the assembly process of the central shaft and the torque sensor, reduce manual participation, improve the operation quality, maintain the consistency of the operation quality, and thus improve the product yield.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The assembly tool of the middle shaft assembly includes a middle shaft and a torque sensor, the torque sensor is sleeved on the middle shaft and can be fixed to the middle shaft, and is characterized in that the assembly tool of the middle shaft assembly includes:

[0009] A base, the central axis can be fixed to the base and the axial direction of the central axis is parallel to the first direction;

[0010] A first-stage telescopic assembly, the first-stage telescopic assembly comprising a first driving member and a support plate, the first driving member being mounted on the base, and the first driving member being capable of adjusting the distance between the support plate and the base along the first direction;

[0011] The secondary telescopic assembly comprises a second driving member and an extruding member, wherein the second driving member is mounted on the support plate, and the second driving member can drive the extruding member to extrude the torque sensor toward one side of the base along the first direction.

[0012] As a preferred technical solution for the assembly tool of the above-mentioned central axis assembly, the above-mentioned extrusion piece is a sleeve structure and is provided with an avoidance hole, and the above-mentioned central axis can be inserted into the above-mentioned avoidance hole.

[0013] As a preferred technical solution for the assembly tooling of the above-mentioned central axis assembly, the above-mentioned base is provided with a waist-shaped hole, and the length direction of the above-mentioned waist-shaped hole is perpendicular to the above-mentioned first direction. The above-mentioned central axis can be inserted into the above-mentioned waist-shaped hole and can slide relative to the above-mentioned base along the length direction of the above-mentioned waist-shaped hole to switch between the first position and the second position. When in the above-mentioned first position, the above-mentioned torque sensor is aligned with the above-mentioned extrusion member, and when in the above-mentioned second position, the above-mentioned torque sensor and the projection of the above-mentioned secondary telescopic assembly in the above-mentioned first direction do not overlap.

[0014] As an optimal technical solution for the assembly tooling of the above-mentioned central axis assembly, the above-mentioned base is provided with a limiting hole at the above-mentioned first position, and the diameter of the above-mentioned limiting hole is D1, satisfying D1>D2>D3>D4, D2 is the diameter of the above-mentioned torque sensor, D3 is the width of the above-mentioned waist-shaped hole, and D4 is the diameter of the above-mentioned central axis.

[0015] As a preferred technical solution for the assembly tooling of the above-mentioned central axis assembly, the above-mentioned first-stage telescopic assembly also includes a guide column, the above-mentioned guide column is fixed to the above-mentioned base, the above-mentioned support plate is sleeved on the above-mentioned guide column and can move relative to the above-mentioned base along the axial direction of the above-mentioned guide column.

[0016] As a preferred technical solution for the assembly tooling of the above-mentioned central axis assembly, the above-mentioned first-stage telescopic assembly also includes an elastic member, and the above-mentioned elastic member is installed on the above-mentioned support plate and can be moved relative to the above-mentioned support plate along the above-mentioned first direction or fixed relative to the above-mentioned support plate.

[0017] As a preferred technical solution for the assembly tooling of the above-mentioned central axis assembly, the above-mentioned elastic member includes a first rod and a second rod, the above-mentioned first rod is fixed to the above-mentioned support plate, the above-mentioned second rod is inserted into the above-mentioned first rod, and the above-mentioned second rod always has a tendency to move out of the above-mentioned first rod.

[0018] As a preferred technical solution for the assembly tooling of the above-mentioned central axis assembly, the above-mentioned secondary telescopic assembly also includes a bracket, and the side of the above-mentioned second driving member facing away from the above-mentioned base is installed on the above-mentioned support plate through the above-mentioned bracket.

[0019] As a preferred technical solution for the assembly tooling of the above-mentioned central axis assembly, the above-mentioned secondary telescopic assembly also includes a guide sleeve, the above-mentioned guide sleeve is fixed to the above-mentioned support plate, and the above-mentioned extrusion piece is inserted into the above-mentioned guide sleeve along the above-mentioned first direction.

[0020] As a preferred technical solution for the assembly tool of the above-mentioned central axis assembly, the above-mentioned central axis is installed on the above-mentioned base in the vertical direction, and a support leg is installed on the side of the above-mentioned base facing away from the above-mentioned secondary telescopic assembly.

[0021] Beneficial effects of the present invention:

[0022] Provided is an assembly tool for a central axis assembly, the central axis assembly includes a central axis and a torque sensor, the torque sensor is sleeved on the central axis and can be fixed to the central axis, and the assembly tool for the central axis assembly includes: a base, a primary telescopic assembly and a secondary telescopic assembly. Among them, the central axis can be fixed to the base and the axial direction of the central axis is parallel to the first direction; the primary telescopic assembly includes a first driving member and a support plate, the first driving member is installed on the base, and the first driving member can adjust the distance between the support plate and the base along the first direction; the secondary telescopic assembly includes a second driving member and an extrusion member, the second driving member is installed on the support plate, and the second driving member can drive the extrusion member to extrude the torque sensor toward one side of the base along the first direction. Specifically, when in use, after the central axis assembly and the base are assembled, the first driving member is started, the first driving member carries the secondary telescopic assembly through the support plate and moves to a preset height, the first driving member is locked, the support plate and the base are kept relatively fixed, and then the second driving member is started, so that the extrusion member applies a force to the torque sensor to complete the assembly with the central axis.

[0023] In this way, the assembly process of the central shaft and torque sensor can be automated through the assembly tooling, reducing manual involvement, improving operation quality, maintaining consistency in operation quality, and thereby improving product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. 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 contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 It is a structural schematic diagram of an assembly tool for a central shaft assembly provided by an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the assembly tool of the middle shaft assembly and the assembly of the middle shaft assembly provided by an embodiment of the present invention;

[0027] Figure 3is a side view of an assembly tool of a central axis assembly and a central axis assembly provided by an embodiment of the present invention;

[0028] Figure 4 is a bottom view of an assembly tool for a central shaft assembly provided by an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of assembling the secondary telescopic assembly and the support plate provided by an embodiment of the present invention;

[0030] Figure 6 It is a bottom view of the secondary telescopic assembly provided by an embodiment of the present invention.

[0031] In the figure:

[0032] X, first direction;

[0033] 100, middle shaft assembly; 110, middle shaft; 120, torque sensor;

[0034] 200. Assembly tooling;

[0035] 210, base; 211, waist-shaped hole; 212, limit hole; 213, support leg; 214, bottom plate; 215, electric control cabinet;

[0036] 220, primary telescopic assembly; 221, first driving member; 222, support plate; 223, elastic member; 2231, first rod; 2232, second rod; 224, guide column; 225, linear bearing;

[0037] 230. Secondary telescopic assembly; 231. Second driving member; 232. Extrusion member; 2321. Avoidance hole; 233. Bracket; 234. Guide sleeve. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] like Figures 1 to 6 As shown, the present invention provides an assembly tool 200 of a central axis assembly, wherein the central axis assembly 100 includes a central axis 110 and a torque sensor 120, wherein the torque sensor 120 is sleeved on the central axis 110 and can be fixed to the central axis 110, and the assembly tool 200 of the central axis assembly includes: a base 210, a primary telescopic assembly 220, and a secondary telescopic assembly 230. The central axis 110 can be fixed to the base 210 and the axial direction of the central axis 110 is parallel to the first direction X; the primary telescopic assembly 220 includes a first driving member 221 and a support plate 222, wherein the first driving member 221 is mounted on the base 210, and the first driving member 221 can adjust the distance between the support plate 222 and the base 210 along the first direction X; the secondary telescopic assembly 230 includes a second driving member 231 and an extrusion member 232, wherein the second driving member 231 is mounted on the support plate 222, and the second driving member 231 can drive the extrusion member 232 to extrude the torque sensor 120 toward one side of the base 210 along the first direction X.

[0043] Exemplarily, after the central axis 110 is installed on the base 210, the axial direction of the central axis 110 is parallel to the first direction X, the central axis 110 and the base 210 are relatively fixed, in the primary telescopic assembly 220, the first driving member 221 is a cylinder, the shell of the first driving member 221 is relatively fixed to the base 210, the telescopic cylinder of the first driving member 221 is installed with a support plate 222, and the telescopic cylinder can be telescoped along the first direction X, thereby driving the support plate 222 to move in the first direction X; in the secondary telescopic assembly 230, the second driving member 231 is a cylinder, and the second driving member 231 is a cylinder. The shell of the member 231 is relatively fixed to the support plate 222, and the telescopic cylinder of the second driving member 231 is installed with an extrusion member 232. The telescopic cylinder can move along the first direction X, thereby driving the extrusion member 232 to move along the first direction X. The extrusion member 232 is used to abut against the torque sensor 120 in the central axis assembly 100 along the first direction X, and can apply a force to the torque sensor 120 along the first direction X, so that the torque sensor 120 moves along the first direction X to the side of the base 210 relative to the central axis 110 until it is fixed to the central axis 110.

[0044] Specifically, during use, after the middle axis assembly 100 and the base 210 are assembled, the first driving member 221 is started, and the first driving member 221 carries the secondary telescopic assembly 230 through the support plate 222 and moves to a preset height. The first driving member 221 is locked to keep the support plate 222 and the base 210 relatively fixed, and then the second driving member 231 is started, so that the extrusion member 232 applies a force to the torque sensor 120 to complete the assembly with the middle axis 110.

[0045] In this way, the assembly process of the central shaft 110 and the torque sensor 120 can be automated through the assembly tool 200, which can reduce manual participation, improve operation quality, maintain consistency in operation quality, and thus improve the yield rate of the product.

[0046] Furthermore, the second driving member 231 is a cylinder, and the second driving member 231 can drive the extrusion member 232 to perform piston motion in the first direction X, that is, within a unit time, the extrusion member 232 reciprocates in the first direction X, impacting the torque sensor 120 multiple times to press the torque sensor 120 and the central axis 110.

[0047] Exemplarily, the base 210 includes a bottom plate 214 and an electric control cabinet 215 , the electric control cabinet 215 is fixed to the bottom plate 214 , and the electric control cabinet 215 and the bottom plate 214 are arranged in an L shape. .

[0048] It should be noted that the middle shaft assembly 100 also includes a first bearing, a second bearing and a retaining spring, wherein the inner ring of the first bearing is fixed to one end of the middle shaft 110, and the torque sensor 120, the second bearing and the retaining spring are sequentially sleeved on the middle shaft 110 at the other end of the middle shaft 110. Under the action of the extrusion piece 232, one axial end of the torque sensor 120 can be fixed to the outer ring of the second bearing, and the other end can be fixed to the outer ring of the first bearing. The retaining spring and the middle shaft 110 are locked, and the retaining spring and the first bearing lock the second bearing and the torque sensor 120 to the middle shaft 110. That is, the extrusion piece 232 directly acts on the retaining spring, and the force is sequentially transmitted between the retaining spring, the first bearing and the torque sensor 120.

[0049] Optionally, the extrusion piece 232 is a sleeve structure, and is provided with an avoidance hole 2321 , and the central axis 110 can be inserted into the avoidance hole 2321 .

[0050] Exemplarily, when the middle axis 110 is installed on the base 210, the extrusion member 232 is coaxially arranged with the middle axis 110, and the middle axis 110 and the avoidance hole 2321 are spaced apart and aligned in the first direction X. When the second driving member 231 drives the extrusion member 232 to apply pressure to the torque sensor 120, the middle axis 110 can be inserted into the avoidance hole 2321, and the axial end face of the avoidance hole 2321 can act on the axial end face of the torque sensor 120 along the first direction X, pressing the torque sensor 120 toward one side of the base 210 to complete the assembly of the torque sensor 120 and the middle axis 110, and the force exerted by the sleeve structure on the axial end face of the torque sensor 120 is the same, which can avoid the torque sensor 120 and the middle axis 110 from being misaligned.

[0051] Optionally, the base 210 is provided with a waist-shaped hole 211, and the length direction of the waist-shaped hole 211 is perpendicular to the first direction X. The central axis 110 can be inserted into the waist-shaped hole 211 and can slide relative to the base 210 along the length direction of the waist-shaped hole 211 to switch between the first position and the second position. In the first position, the torque sensor 120 is aligned with the extrusion piece 232. In the second position, the projection of the torque sensor 120 and the secondary telescopic component 230 in the first direction X does not overlap.

[0052] Exemplarily, the depth direction of the waist-shaped hole 211 is parallel to the first direction X, and the second position for completing the preliminary installation of the central axis 110 and the base 210 and the first position for completing the alignment of the central axis 110 and the extrusion piece 232 are defined on the base 210, and the two ends of the waist-shaped hole 211 in the length direction are formed at the first position and the second position respectively. Since the second position is not blocked by the extrusion piece 232 in the first direction X, the preliminary assembly of the central axis 110 and the base 210 is convenient. The central axis 110 is inserted into the waist-shaped hole 211 at the second position, and at this time, the side wall of the waist-shaped hole 211 in the width direction can limit the swing of the central axis 110 relative to the base 210.

[0053] Optionally, the base 210 opens a limiting hole 212 at the first position, and the diameter of the limiting hole 212 is D1, satisfying D1>D2>D3>D4, D2 is the diameter of the torque sensor 120, D3 is the width of the waist-shaped hole 211, and D4 is the diameter of the central axis 110.

[0054] With such arrangement, when the middle shaft assembly 100 moves to the first position, the middle shaft 110 and part of the torque sensor 120 can be inserted into the limiting hole 212 , and the inner peripheral wall of the limiting hole 212 can limit the outer side wall of the torque sensor 120 .

[0055] Optionally, the first-stage telescopic assembly 220 further includes a guide column 224 , which is fixed to the base 210 , and the support plate 222 is sleeved on the guide column 224 and can move relative to the base 210 along the axial direction of the guide column 224 .

[0056] Specifically, the axial direction of the guide column 224 is parallel to the first direction X, one end of the guide column 224 is fixed to the base 210, and the other end is inserted into the support plate 222. When the first driving member 221 is started, the support plate 222 can move along the guide column 224 toward the base 210, thereby regulating the movement trajectory of the support plate 222, so that the second telescopic assembly 230 can maintain an alignment relationship with the central axis assembly 100.

[0057] Furthermore, the support plate 222 is connected to the guide column 224 via a linear bearing 225 , so that the friction between the support plate 222 and the guide column 224 can be reduced.

[0058] Exemplarily, a plurality of guide posts 224 are provided and are respectively mounted on the base 210 , so that the movement of the support plate 222 can be kept stable.

[0059] Optionally, the first-stage telescopic assembly 220 further includes an elastic member 223, which is mounted on the support plate 222 and can move relative to the support plate 222 or be fixed relative to the support plate 222 along the first direction X. Specifically, when in use, the distance between the elastic member 223 and the base 210 can be adjusted according to the height of the middle axis assembly 100 and the travel distance of the first driving member 221 in the first direction X. When the first driving member 221 drives the support plate 222 to move toward one side of the base 210, one end of the elastic member 223 can contact the base 210. As the first driving member 221 continues to feed, the elastic member 223 undergoes elastic deformation to buffer and limit the further feeding of the first driving member 221.

[0060] Optionally, the elastic member 223 includes a first rod 2231 and a second rod 2232 , the first rod 2231 is fixed to the support plate 222 , the second rod 2232 is inserted into the first rod 2231 , and the second rod 2232 always has a moving tendency to extend out of the first rod 2231 .

[0061] Exemplarily, the support plate 222 is provided with a threaded hole along the first direction X, the first rod 2231 is inserted into the threaded hole and threadedly connected to the support plate 222, the second rod 2232 is inserted into the first rod 2231, and a hydraulic system is provided in the first rod 2231, so that the second rod 2232 always has a tendency to move out of the first rod 2231. The end of the second rod 2232 facing away from the first rod 2231 is used to abut against the base 210.

[0062] Exemplarily, a spring or other elastic component may be installed in the first rod 2231 , so that the first rod 2231 always has a tendency to extend out of the second rod 2232 .

[0063] Optionally, the secondary telescopic assembly 230 further includes a bracket 233 , and a side of the second driving member 231 facing away from the base 210 is mounted on the support plate 222 through the bracket 233 .

[0064] Exemplarily, the bracket 233 is a gantry structure, and the second driving member 231 is installed at the central position of the bracket 233, so that the second driving member 231 can be kept stable relative to the support plate 222.

[0065] Optionally, the secondary telescopic assembly 230 further includes a guide sleeve 234, the guide sleeve 234 is fixed to the support plate 222, and the extrusion piece 232 is inserted into the guide sleeve 234 along the first direction X. In this way, the guide sleeve 234 can limit the swing of the extrusion piece 232 relative to the support plate 222, regulate the movement trajectory of the extrusion piece 232, and ensure the operation quality of the extrusion piece 232 on the torque sensor 120.

[0066] Exemplarily, the support plate 222 is provided with a through hole along the first direction X, and the guide sleeve 234 is mounted on the support plate 222 via a flange structure and fixed to the axial end surface of the through hole.

[0067] Furthermore, the guide sleeve 234 is installed on the side of the support plate 222 facing away from the base 210 to provide an escape for the installation of the central axis assembly 100 and the base 210 .

[0068] Optionally, the central axis 110 is installed on the base 210 along the vertical direction, and a support leg 213 is installed on the side of the base 210 facing away from the secondary telescopic assembly 230.

[0069] In this way, the support legs 213 are provided to buffer the extrusion member 232 , so that the impact on the base 210 when the torque sensor 120 is in operation can be reduced, thereby keeping the base 210 stably placed.

[0070] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An assembly tool for a middle shaft assembly, wherein the middle shaft assembly (100) comprises a middle shaft (110) and a torque sensor (120), wherein the torque sensor (120) is sleeved on the middle shaft (110) and can be fixed to the middle shaft (110), characterized in that: The assembly tool of the central shaft assembly comprises: A base (210), the central axis (110) being capable of being fixed to the base (210), and the axial direction of the central axis (110) being parallel to the first direction (X); a first-stage telescopic assembly (220), the first-stage telescopic assembly (220) comprising a first driving member (221) and a support plate (222), the first driving member (221) being mounted on the base (210), the first driving member (221) being capable of adjusting the distance between the support plate (222) and the base (210) along the first direction (X); A two-stage telescopic assembly (230), the two-stage telescopic assembly (230) comprising a second driving member (231) and an extruding member (232), the second driving member (231) being mounted on the support plate (222), the second driving member (231) being capable of driving the extruding member (232) to extrude the torque sensor (120) toward one side of the base (210) along the first direction (X).

2. The assembly tool for the middle shaft assembly according to claim 1, characterized in that: The extrusion piece (232) is a sleeve structure and is provided with an avoidance hole (2321), and the central axis (110) can be inserted into the avoidance hole (2321).

3. The assembly tool for the middle shaft assembly according to claim 1, characterized in that: The base (210) is provided with a waist-shaped hole (211), the length direction of the waist-shaped hole (211) is perpendicular to the first direction (X), the central axis (110) can be inserted into the waist-shaped hole (211) and can slide relative to the base (210) along the length direction of the waist-shaped hole (211) to switch between a first position and a second position, when in the first position, the torque sensor (120) is aligned with the extrusion member (232), and when in the second position, the projections of the torque sensor (120) and the secondary telescopic component (230) in the first direction (X) do not overlap.

4. The assembly tool for the middle shaft assembly according to claim 3, characterized in that: The base (210) is provided with a limiting hole (212) at the first position, and the diameter of the limiting hole (212) is D1, satisfying the condition D1>D2>D3>D4, D2 is the diameter of the torque sensor (120), D3 is the width of the waist-shaped hole (211), and D4 is the diameter of the central axis (110).

5. The assembly tool for the middle shaft assembly according to claim 1, characterized in that: The first-stage telescopic assembly (220) further comprises a guide column (224), wherein the guide column (224) is fixed to the base (210), and the support plate (222) is sleeved on the guide column (224) and is movable relative to the base (210) along the axial direction of the guide column (224).

6. The assembly tool for the middle shaft assembly according to claim 1, characterized in that: The first-stage telescopic assembly (220) further comprises an elastic member (223), wherein the elastic member (223) is mounted on the support plate (222) and is capable of moving relative to the support plate (222) along the first direction (X) or being fixed relative to the support plate (222).

7. The assembly tool for the middle shaft assembly according to claim 6, characterized in that: The elastic member (223) comprises a first rod (2231) and a second rod (2232), wherein the first rod (2231) is fixed to the support plate (222), the second rod (2232) is inserted into the first rod (2231), and the second rod (2232) always has a tendency to move out of the first rod (2231).

8. The assembly tool for the middle shaft assembly according to claim 1, characterized in that: The secondary telescopic assembly (230) further comprises a bracket (233), and a side of the second driving member (231) facing away from the base (210) is mounted on the support plate (222) via the bracket (233).

9. The assembly tool for the middle shaft assembly according to claim 1, characterized in that: The secondary telescopic assembly (230) further comprises a guide sleeve (234), wherein the guide sleeve (234) is fixed to the support plate (222), and the extrusion member (232) is inserted into the guide sleeve (234) along the first direction (X).

10. The assembly tool for the middle shaft assembly according to claim 1, characterized in that: The central axis (110) is mounted on the base (210) in a vertical direction, and a support leg (213) is mounted on a side of the base (210) facing away from the secondary telescopic assembly (230).

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