Mounting tool

Abstract

The embodiment of the utility model discloses an installation tool. The mounting tool is used for mounting an elastic element, the elastic element is of an annular structure with a notch, and the mounting tool comprises an outer sleeve body and an inner sleeve body. The outer sleeve body is of a hollow cylindrical structure and is provided with a first mounting platform; the inner sleeve body is arranged in the outer sleeve body and is provided with a second mounting platform; wherein the first mounting platform and the second mounting platform are matched with each other to form a mounting plane used for clamping the elastic element, and the inner sleeve body or the outer sleeve body can rotate in the axis direction of the inner sleeve body or the outer sleeve body so that the opening state of the elastic element can be adjusted through the mounting plane. According to the mounting tool, the first mounting platform and the second mounting platform generate relative displacement by rotating the inner sleeve body or the outer sleeve body, so that the state of the mounting plane is changed, the elastic element arranged in the mounting plane can be switched between different opening states, the elastic element can be mounted on the motor shaft conveniently, and the mounting efficiency, stability and safety are improved.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, and in particular to an installation tool. Background Technology

[0002] In motor structure design, snap rings are often used to fix the inner and outer rings of the bearing.

[0003] In related production processes, as more and more customers expect gears to be integrated onto the motor shaft, and the precision requirements for motor gears are also increasing, the assembly of snap rings presents significant challenges. This is especially true on automated production lines, where the protection of the motor output gears must be achieved while ensuring the safe, accurate, and efficient installation of the snap rings. Traditional methods using snap ring pliers or tensioning sleeves are insufficient to meet current application needs.

[0004] Therefore, a new installation tool is urgently needed. Utility Model Content

[0005] The purpose of this utility model is to provide an installation tool that, by rotating the inner or outer sleeve, causes a relative displacement between the first and second installation platforms, thereby changing the state of the installation plane. This allows the elastic element set in the installation plane to switch between different opening states, facilitating its installation on the motor shaft, improving installation efficiency and stability, and providing sufficient safety performance.

[0006] This utility model discloses an installation tool for installing an elastic element, wherein the elastic element is a ring-shaped structure with a notch, comprising:

[0007] The outer casing has a hollow cylindrical structure and a first mounting platform;

[0008] The inner sleeve is arranged inside the outer sleeve and has a second mounting platform;

[0009] The first mounting platform and the second mounting platform cooperate with each other to form a mounting plane for securing the elastic element. The inner sleeve or the outer sleeve can rotate along its own axis to adjust the opening state of the elastic element through the mounting plane.

[0010] Furthermore, when the inner sleeve or the outer sleeve rotates to the first preset position, one end of the first mounting platform and one end of the second mounting platform approach each other, and the opening state of the elastic element is adjusted to a free state through the mounting plane;

[0011] When the inner sleeve or the outer sleeve rotates to the second preset position, one end of the first mounting platform and one end of the second mounting platform move away from each other, and the opening state of the elastic element is adjusted to the open state through the mounting plane.

[0012] Furthermore, the first mounting platform is wound around the inner wall surface of the outer sleeve, and the second mounting platform is wound around the end face of the inner sleeve; wherein, the upper top surface of the first mounting platform and the upper top surface of the second mounting platform cooperate with each other to form the mounting plane, and the mounting plane is arranged parallel to the horizontal plane.

[0013] Furthermore, there is a rotational clearance between the bottom surface of the first mounting platform and the end face of the inner sleeve.

[0014] Furthermore, the first mounting platform is a ring structure, and one end of it has a first abutment block protruding along the axial direction; the second mounting platform is a ring structure, and one end of it has a second abutment block protruding along the axial direction; wherein, through the mutual cooperation of the first abutment block and the second abutment block, the degrees of freedom on both sides of the notch of the elastic element can be restricted.

[0015] Furthermore, the first abutting block and the second abutting block have the same outline, and each includes an abutting portion and a limiting portion. The abutting portion extends along the radial direction of the outer casing, and the limiting portion is connected to one side of the abutting portion and extends along the circumferential direction of the outer casing.

[0016] Furthermore, the outer sleeve also has a limiting section, and the second mounting platform also includes a circumferential extension section that cooperates with the limiting section. When the inner sleeve or the outer sleeve rotates to the second preset working position, the circumferential extension section abuts against the end face of the limiting section.

[0017] Furthermore, the outer sleeve or the inner sleeve is provided with a rotating through hole, and a rotating pressure rod is installed in the rotating through hole. One end of the rotating pressure rod is used to receive driving force so that the outer sleeve or the inner sleeve can be rotated by rotating the rotating pressure rod.

[0018] Furthermore, the rotating through hole is formed in the inner sleeve, and the outer sleeve also includes a base. The base has a circumferentially arranged rotating groove. The rotating through hole can rotate along the extension path of the rotating groove, and the rotating pressure rod is always located within the rotating groove.

[0019] Furthermore, a protective layer is arranged on the inner circumferential surface of the first mounting platform and / or the inner circumferential surface of the second mounting platform.

[0020] Furthermore, the protective layer includes a plastic protective layer or a rubber protective layer.

[0021] The installation tool provided by this utility model has at least the following beneficial effects, including but not limited to:

[0022] 1) This installation tool causes relative displacement between the first and second installation platforms by rotating the inner or outer sleeve, thereby changing the state of the installation plane and enabling the elastic element set in the installation plane to switch between different opening states, so as to facilitate its installation on the motor shaft, improve installation efficiency and stability, and has sufficient safety performance.

[0023] 2) This installation tool can drive structural changes by rotating the pressure rod, eliminating the tedious steps of manually opening or forcibly expanding the elastic element in the traditional way. It significantly improves the convenience and efficiency of installing elastic elements (especially notched ring elements) to the motor shaft and other mating shafts. In addition, the driving path of rotating the pressure rod in this installation tool is relatively simple and clear. It can be driven by an air pump or electric push rod, which is conducive to industrial promotion.

[0024] 3) The installation tool utilizes structural displacement coordination and limiting section design to precisely control the opening size and direction of the elastic element when it is opened, effectively avoiding stress concentration and material damage caused by excessive opening of the elastic element, and extending the service life of the elastic element. Attached Figure Description

[0025] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0026] Figure 1 A schematic diagram of the structure of the installation tool provided in the embodiment of this utility model;

[0027] Figure 2 This is a partial schematic diagram of the installation tool when it is in the first preset work position, as provided in an embodiment of the present utility model.

[0028] Figure 3 This is a partial schematic diagram of the installation tool when it is in the second preset working position, as provided in an embodiment of the present utility model.

[0029] Figure 4 A schematic diagram of the outer casing provided in an embodiment of this utility model;

[0030] Figure 5 This is a schematic diagram of the inner sleeve provided in an embodiment of the present utility model.

[0031] Icons: 100-Installation tool; 11-Outer casing; 111-First mounting platform; 1111-First upper top surface; 1112-First lower bottom surface; 1113-Rotation gap; 1114-First abutment block; 112-Limiting section; 113-Base; 1131-Rotation groove; 12-Inner casing; 121-Second mounting platform; 1211-Second upper top surface; 122-Circumferential extension section; 123-Second abutment block; 131-Abutment part; 132-Limiting part; 14-Rotation through hole; 15-Protective layer; 200-Elastic element. Detailed Implementation

[0032] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] Please refer to Figures 1-5 The installation tool 100 is used for installing the elastic element 200, which is a ring-shaped structure with a notch. The installation tool 100 includes an outer sleeve 11 and an inner sleeve 12. The outer sleeve 11 is a hollow cylindrical structure and has a first installation platform 111. The inner sleeve 12 is arranged inside the outer sleeve 11 and has a second installation platform 121. The first installation platform 111 and the second installation platform 121 cooperate with each other to form an installation plane for engaging the elastic element 200. The inner sleeve 12 or the outer sleeve 11 can rotate along its own axis to adjust the opening state of the elastic element 200 through the installation plane.

[0035] It should be noted that the elastic element 200 in this embodiment can be a snap ring (such as an open snap ring), which is commonly used to assemble on the outer surface of a motor shaft or similar shaft-like components to limit or fix them. Depending on the specific implementation environment, the elastic element 200 can also be other ring-like structures with elastic deformation capabilities and openings.

[0036] It is worth noting that the installation tool 100 can rotate the inner sleeve 12 or the outer sleeve 11 to cause relative displacement between the first installation platform 111 and the second installation platform 121, thereby changing the state of the installation plane. This allows the elastic element 200 set in the installation plane to switch between different opening states, so that it can be installed on the motor shaft, improving installation efficiency and stability, and it has sufficient safety performance.

[0037] Please refer to this again. Figure 2 and Figure 3 When the inner sleeve 12 or the outer sleeve 11 rotates to the first preset position, one end of the first mounting platform 111 and one end of the second mounting platform 121 approach each other, and the opening state of the elastic element 200 is adjusted to a free state through the mounting plane; when the inner sleeve 12 or the outer sleeve 11 rotates to the second preset position, one end of the first mounting platform 111 and one end of the second mounting platform 121 move away from each other, and the opening state of the elastic element 200 is adjusted to a stretched state through the mounting plane.

[0038] It should be noted that when one end of the first mounting platform 111 and one end of the second mounting platform 121 are close together, it means that the ends of both platforms that abut against the elastic element 200 are close together. At this time, the mounting plane is in a contracted state, and the elastic element 200 can be freely arranged on the mounting plane, which facilitates initial positioning and assembly preparation. Similarly, when one end of the first mounting platform 111 and one end of the second mounting platform 121 are far apart, it means that the ends of both platforms that abut against the elastic element 200 are far apart. At this time, the mounting plane is in an expanded state, and the elastic element 200 is forced to open and is in an extended state, making it easier to smoothly install into the groove or annular groove of the motor shaft.

[0039] It is worth noting that the installation tool 100 can precisely control the opening degree of the elastic element 200 by setting different preset positions and combining the approach and distance of the platform structure, thus meeting the assembly requirements of different shaft diameters or structural components and improving installation flexibility and applicability. At the same time, since the opening operation can be achieved through rotation, it avoids manually using tools to forcibly open the elastic element 200, thereby greatly reducing the difficulty and error rate of operation, improving the consistency and safety of operation, and also protecting the elastic element 200 and extending its service life.

[0040] Please refer to this again. Figure 1 , Figure 4 and Figure 5The first mounting platform 111 is wrapped around the inner wall of the outer sleeve 11, and the second mounting platform 121 is wrapped around the end face of the inner sleeve 12; wherein, the upper top surface of the first mounting platform 111 (i.e., the first upper top surface 1111) and the upper top surface of the second mounting platform 121 (i.e., the second upper top surface 1211) cooperate with each other to form a mounting plane, and the mounting plane is parallel to the horizontal plane.

[0041] It is worth noting that the mounting plane formed by the first upper top surface 1111 and the second upper top surface 1211 is parallel to the horizontal plane, meaning that the first upper top surface 1111 and the second upper top surface 1211 are flush with each other and parallel to the horizontal plane. This arrangement allows the elastic element 200 to be placed naturally on the platform without tilting or rolling, thereby reducing additional positioning actions, improving placement stability and work efficiency. At the same time, with the elastic element 200 located on a horizontal mounting plane, its force direction is more uniform and its symmetry is better during the opening process, which can reduce deformation deviations caused by eccentricity and offset, further improving installation accuracy and consistency.

[0042] Please refer to this again. Figure 1 There is a rotation gap 1113 between the bottom surface of the first mounting platform 111 and the end face (i.e., the first bottom surface 1112) of the inner sleeve 12.

[0043] It is worth noting that the rotation clearance 1113 provides the necessary movement space for the first mounting platform 111, preventing friction or interference between it and the end face of the inner sleeve 12 during rotation. This achieves smooth, low-friction, and jam-free rotation, improving rotation efficiency. It is also understandable that without the rotation clearance 1113, scraping, abnormal noise, or metal shavings would occur during rotation. This structure, through its reasonable clearance design, effectively reduces motion friction noise and component wear, improving overall stability and quietness. In some specific embodiments, lubricating medium can be filled into this clearance as needed to further improve rotation efficiency.

[0044] Please refer to this again. Figure 1 , Figure 4 and Figure 5 The first mounting platform 111 has a ring-shaped structure and a first abutting block 1114 protruding along the axial direction at one end; the second mounting platform 121 has a ring-shaped structure and a second abutting block 123 protruding along the axial direction at one end; wherein, through the mutual cooperation of the first abutting block 1114 and the second abutting block 123, the degrees of freedom on both sides of the notch of the elastic element 200 can be restricted.

[0045] It should be noted that the axial direction here refers to the direction of the axis of the outer sleeve 11 / inner sleeve 12.

[0046] It is worth noting that, due to the presence of the structural notch, the elastic element 200 is prone to deflection, tilting, or rotation when unrestrained. Therefore, by setting the first abutment block 1114 and the second abutment block 123 to cooperate and clamp on both sides of the notch, its displacement in the radial and circumferential directions can be effectively limited, maintaining its positioning stability on the mounting plane. That is, the application of the abutment blocks can further improve the limiting effect on the position of the notch of the elastic element 200, thereby ensuring the accuracy of the opening size of the elastic element 200.

[0047] Please refer to this again. Figure 4 and Figure 5 The first abutting block 1114 and the second abutting block 123 have the same outline, and both include an abutting part 131 and a limiting part 132. The abutting part 131 extends along the radial direction of the outer cover 11, and the limiting part 132 is connected to one side of the abutting part 131 and extends along the circumferential direction of the outer cover 11.

[0048] It is worth noting that the two abutment blocks have the same outline and symmetrical function, which can form a balanced and symmetrical clamping force, so that the elastic element 200 is always in a structurally symmetrical clamping state on both sides of the notch, thereby effectively improving the clamping accuracy and stability and preventing deflection or dislodgement caused by unilateral force. Specifically, the abutment part 131 is responsible for radial support, and the limiting part 132 is responsible for circumferential constraint. The two work together to achieve multi-dimensional constraint on the elastic element 200, especially to suppress the sliding and rotation of the elastic arm at the notch, and prevent it from deviating or rotating due to uneven force.

[0049] Please refer to this again. Figure 1 The outer sleeve 11 also has a limiting section 112, and the second installation platform 121 also includes a circumferential extension section 122 that cooperates with the limiting section 112. When the inner sleeve 12 or the outer sleeve 11 rotates to the second preset position, the circumferential extension section 122 abuts against the end face of the limiting section 112.

[0050] It is worth noting that the cooperation between the limiting section 112 and the circumferential extension section 122 constitutes a mechanical limiting and stopping structure, which ensures that the inner sleeve 12 or the outer sleeve 11 accurately stops at the target position when rotated to the second preset station, avoiding abnormal opening angle of the elastic element 200 or failure to assemble properly due to excessive rotation. In addition, this structural design allows for precise control of the opening size and direction of the elastic element 200 when it is opened, effectively avoiding stress concentration and material damage caused by excessive opening of the elastic element 200, and extending the service life of the elastic element 200.

[0051] In this embodiment, the outer sleeve 11 or the inner sleeve 12 is also provided with a rotating through hole 14, and a rotating pressure rod (not shown in the figure) is installed in the rotating through hole 14. One end of the rotating pressure rod is used to receive driving force so that the outer sleeve 11 or the inner sleeve 12 can be rotated by rotating the rotating pressure rod. It can be understood that the installation tool 100 can drive structural changes by rotating the rotating pressure rod, eliminating the cumbersome steps of manually opening or forcibly expanding the elastic element 200 in the traditional way. This significantly improves the convenience and efficiency of installing the elastic element 200 to the motor shaft or other mating shafts. Moreover, in this installation tool 100, the driving path of the rotating pressure rod is relatively simple and clear. It can be driven by an air pump or an electric push rod, which is conducive to industrial promotion. It can also be understood that in some special environments, the rotating pressure rod can also be manually rotated to achieve relative rotation between the inner sleeve 12 and the outer sleeve 11.

[0052] It should be noted that the rotating pressure rod can be a simple rod structure, with one end connected to the rotating through hole 14 by a threaded connection, and the other end extending out to be used to cooperate with an air pump, electric push rod or manual rotation. The structure of the rotating pressure rod is relatively simple, so it is not shown in the figure.

[0053] In this embodiment, the rotating through hole 14 is formed in the inner sleeve 12, and the outer sleeve 11 also includes a base 113. The base 113 has a circumferentially arranged rotating groove 1131. The rotating through hole 14 can rotate along the extension path of the rotating groove 1131, and the rotating pressure rod is always located in the rotating groove 1131.

[0054] It is worth noting that the rotating pressure rod is always positioned within the rotating groove 1131 of the base 113. The rotating groove 1131 forms a physical guide rail structure, effectively guiding the rod to rotate along a preset trajectory (such as an arc), thus ensuring that the pressure rod will not deviate, jam, or rotate eccentrically, greatly improving the reliability of the device. Furthermore, since the rotating groove 1131 has a fixed length and angle range, it can directly limit the rotation angle of the rotating pressure rod, thereby preventing the operator from over-rotating or under-rotating, effectively protecting the internal structure (such as the inner and outer casings 11, the mounting platform, etc.) from damage.

[0055] Please refer to this again. Figure 1 A protective layer 15 is provided on the inner circumferential surface of the first mounting platform 111 and / or the inner circumferential surface of the second mounting platform 121.

[0056] Optionally, the protective layer 15 may include a plastic protective layer 15 or a rubber protective layer 15.

[0057] Specifically, lining the inner circumferential surface of the first mounting platform 111 and / or the inner diameter of the inner circumferential surface of the second mounting platform 121 with a plastic or rubber collar can prevent the gears on the shaft from being damaged by bumps, thereby improving the safety of assembly.

[0058] In summary, the working principle of the installation tool 100 is as follows: when the elastic element 200 is in a free state, the tongue-tip stop structure (i.e., the first abutment block 1114 and the second abutment block 123) is in a free state. Figure 2 In the closed state shown, as the inner sleeve 12 and outer sleeve 11 of the tool rotate relative to each other, the elastic element 200 is gradually opened. When the inner sleeve 12 and outer sleeve 11 of the tool rotate to a specified angle, the limiting segment 112 and the circumferential extension segment 122 cooperate with each other. At this time, the inner sleeve 12 and outer sleeve 11 of the tool no longer have room to rotate, and the elastic element 200 is opened to its maximum state. Since the back of the elastic element 200 is supported by the mounting plane formed by the inner sleeve 12 and outer sleeve 11 when it is opened to its maximum state, the elastic element 200 will not be misaligned. In this state, the installation tool 100, together with the elastic element 200, is sent into the retaining spring mounting slot. Rotating the installation tool 100 in the opposite direction releases the elastic element 200, thus achieving the installation and positioning of the elastic element 200.

[0059] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0060] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0061] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0062] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0063] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0064] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0065] The above description of the embodiments shown in this utility model (including the content in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments of the utility model, and such modifications will be within the spirit and scope of the utility model.

[0066] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. An installation tool for installing an elastic element, said elastic element being a ring-shaped structure with a notch, characterized in that, include: The outer casing has a hollow cylindrical structure and a first mounting platform; The inner sleeve is arranged inside the outer sleeve and has a second mounting platform; The first mounting platform and the second mounting platform cooperate with each other to form a mounting plane for securing the elastic element. The inner sleeve or the outer sleeve can rotate along its own axis to adjust the opening state of the elastic element through the mounting plane.

2. The installation tool according to claim 1, characterized in that, When the inner sleeve or the outer sleeve rotates to the first preset position, one end of the first mounting platform and one end of the second mounting platform approach each other, and the opening state of the elastic element is adjusted to a free state through the mounting plane; When the inner sleeve or the outer sleeve rotates to the second preset position, one end of the first mounting platform and one end of the second mounting platform move away from each other, and the opening state of the elastic element is adjusted to the open state through the mounting plane.

3. The installation tool according to claim 2, characterized in that, The first mounting platform is wound around the inner wall of the outer sleeve, and the second mounting platform is wound around the end face of the inner sleeve; wherein, the upper top surface of the first mounting platform and the upper top surface of the second mounting platform cooperate with each other to form the mounting plane, and the mounting plane is parallel to the horizontal plane.

4. The installation tool according to claim 3, characterized in that, There is a rotational clearance between the bottom surface of the first mounting platform and the end face of the inner sleeve.

5. The installation tool according to claim 2, characterized in that, The first mounting platform is a ring structure, and one end of it has a first abutment block protruding along the axial direction; the second mounting platform is a ring structure, and one end of it has a second abutment block protruding along the axial direction; wherein, through the mutual cooperation of the first abutment block and the second abutment block, the degrees of freedom on both sides of the notch of the elastic element can be restricted.

6. The installation tool according to claim 5, characterized in that, The first abutting block and the second abutting block have the same outline, and each of them includes an abutting portion and a limiting portion. The abutting portion extends along the radial direction of the outer casing, and the limiting portion is connected to one side of the abutting portion and extends along the circumferential direction of the outer casing.

7. The installation tool according to claim 2, characterized in that, The outer sleeve also has a limiting section, and the second mounting platform also includes a circumferential extension section that cooperates with the limiting section. When the inner sleeve or the outer sleeve rotates to the second preset position, the circumferential extension section abuts against the end face of the limiting section.

8. The installation tool according to claim 1, characterized in that, The outer sleeve or the inner sleeve is also provided with a rotating through hole, and a rotating pressure rod is installed in the rotating through hole. One end of the rotating pressure rod is used to receive driving force so that the outer sleeve or the inner sleeve can be rotated by rotating the rotating pressure rod.

9. The installation tool according to claim 8, characterized in that, The rotating through hole is formed in the inner sleeve, and the outer sleeve also includes a base. The base has a circumferentially arranged rotating groove. The rotating through hole can rotate along the extension path of the rotating groove, and the rotating pressure rod is always located in the rotating groove.

10. The installation tool according to claim 1, characterized in that, A protective layer is provided on the inner circumferential surface of the first mounting platform and / or the inner circumferential surface of the second mounting platform.

11. The installation tool according to claim 10, characterized in that, The protective layer may be a plastic protective layer or a rubber protective layer.

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