Permanent magnet journal sticking axle generator installation tool

By designing the permanent magnet shaft bearing shaft belt generator installation tool for clamping positioning parts and mounting covers, the air gap adjustment problem during the installation of the modular shaft bearing generator is solved, and the accurate installation and sealing of the stator module are achieved, reducing the installation difficulty and speeding up the installation speed.

CN223124762UActive Publication Date: 2025-07-18DALIAN HAIYUE MARINE EQUIP +1
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Patent Information

Application Number
CN202420800816.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-17
Publication Date
2025-07-18
Estimated Expiration
2034-04-17

AI Technical Summary

Technical Problem

It is difficult to ensure uniform air gap during the installation process of the modular shaft-holding generator. Due to space and weight, it is difficult to effectively adjust the air gap in existing installation tools, and the permanent magnet rotor suction is high, which increases the installation difficulty.

Method used

A permanent magnet shaft belt generator installation tool including a clamping positioner and a mounting cover is designed to position the stator rotor module through the clamping positioner, and the air gap is adjusted using support and rotation adjustment bolts, combining pre-fixed parts and cover components to ensure accurate installation and sealing of the stator rotor module.

Benefits of technology

It improves the installation accuracy and sealing of the stator rotor module, reduces the number of air gap adjustments, and ensures the rapid installation and normal operation of the generator.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN223124762U_ABST
    Figure CN223124762U_ABST
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Abstract

The utility model relates to the technical field of axle suspension generator installation, in particular to a permanent magnet axle suspension axle generator installation tool. The utility model relates to a motor stator and rotor assembly which comprises a plurality of clamping and positioning pieces which are combined with one another, an engine rotating shaft is arranged in each clamping and positioning piece, a stator and rotor module is installed on each engine rotating shaft, the stator and rotor modules are arranged in the clamping and positioning pieces, and the clamping and positioning pieces position the stator and rotor modules. According to the utility model, the stator and rotor module is positioned through the clamping positioning piece, the accuracy of mounting the stator and rotor module on the rotating shaft of the engine is enhanced through the mounting cover, the accurate mounting of the stator and rotor module is ensured, and meanwhile, when the clamping positioning piece is supported through the arranged supporting piece, the adjusting bolt is rotated to adjust the clamping positioning piece. The adjusting bolt pushes the clamping and positioning piece to move, the clamping and positioning piece drives the stator and rotor module to move, the size of an air gap between the stator and rotor module and an engine rotating shaft is adjusted, and therefore accurate installation of the stator and rotor module is guaranteed.
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Description

Technical Field

[0001] The utility model relates to the technical field of installation of axle-mounted generators, and specifically, to an installation tool for a permanent magnet axle-mounted shaft-driven generator. Background Technique

[0002] The axle-mounted generator belongs to the type of sub-assembled motor, that is, it is not a complete motor / generator structure by itself before being installed at the application site. The stator and rotor need to be installed on the original equipment. Affected by factors such as the space on the ship and the lifting weight, modular products with small weight and small volume have become the future development direction. However, although modular products have small weight and small volume, they increase the number of times of adjusting the air gap. Undoubtedly, it increases the difficulty of modular installation. Also, because of the modularization of the product, there are many components, and the air gap needs to be continuously adjusted during installation. However, the modular axle-mounted generator cannot ensure uniform air gap relying on its own structure. During the installation process, an installation tool for the axle-mounted generator is required to install the axle-mounted generator, so that the installation tool adjusts the air gap of the axle-mounted generator to ensure the concentricity of the stator and rotor of the generator. However, due to the large volume and weight of the motor, many components, limited on-site conditions, and the strong suction force of the permanent magnet rotor, it brings great difficulties to the air gap adjustment. In order to reduce the installation difficulty of the axle-mounted generator, an installation tool that is convenient for installing the axle-mounted generator is needed. Content of the Utility Model

[0003] The purpose of the utility model is to provide an installation tool for a permanent magnet axle-mounted shaft-driven generator to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the utility model aims to provide an installation tool for a permanent magnet axle-mounted shaft-driven generator, which includes a plurality of mutually combined clamping and positioning parts. An engine rotating shaft is arranged inside the clamping and positioning parts. A stator-rotor module is installed on the engine rotating shaft. The stator-rotor module is arranged inside the clamping and positioning parts. The clamping and positioning parts position the stator-rotor module. At the same time, an installation cover is arranged on the side of the clamping and positioning parts. The installation cover shields the stator-rotor module. The clamping and positioning parts include two combined parts. The two combined parts are combined together to form a ring adapted to the stator-rotor module. The two combined parts position the stator-rotor module. A support part is arranged on the lower side of the combined part. The support part is installed on the ship's hull and supports the combined part. At the same time, the support part adjusts the positions of the two combined parts.

[0005] As a further improvement of the present technical solution, the assembly includes a clamping ring in the shape of a semi-circular ring. End plates are fixed to the outer side walls at both ends of the clamping ring. The two ends of the two clamping rings are in contact and combined to form a ring. The stator-rotor module is installed between the two clamping rings. When the two ends of the two clamping rings are in contact, the end plates located at the two ends of the clamping rings on the two clamping rings are in contact with each other, and the two mutually contacting end plates are connected by screws.

[0006] As a further improvement of the present technical solution, the support member includes a base frame. A support plate is fixed to the top of the base frame. A receiving plate is connected to the upper side of the support plate by screws. The receiving plate is fixed to the outer side wall of the clamping ring. The base frame is fixed to the hull by screws.

[0007] As a further improvement of the present technical solution, a limiting block is fixed to one end of the upper side of the support plate away from the clamping ring. An adjusting bolt is threadedly connected to the limiting block. One end of the adjusting bolt contacts the side wall of the receiving plate, and the adjusting bolt pushes the receiving plate when rotated.

[0008] As a further improvement of the present technical solution, the installation cover includes a pre-fixing member and a stable fixing member. The pre-fixing member is used to pre-fix the positions of the stator-rotor module and the engine rotating shaft inside the clamping and positioning member. The stable fixing member is used to seal both sides of the clamping and positioning member after the clamping and positioning member, the stator-rotor module, and the engine rotating shaft are installed.

[0009] As a further improvement of the present technical solution, the stable fixing member includes two covering assemblies. Both the pre-fixing member and the covering assemblies include two mounting plates. Outer stop groove arc plates are fixed to the outer side walls of the mounting plates. The two mounting plates are combined to form a circle, and the two mounting plates are fixedly connected by screws. Outer stop grooves are provided on both side walls of the clamping ring. The outer stop groove arc plates are arranged in the outer stop grooves, and the outer stop groove arc plates and the outer stop grooves are fixed together by screws.

[0010] As a further improvement of the present technical solution, mounting connection arc plates are fixed at the positions of the centers of the two mounting plates on the pre-fixing member. The engine rotating shaft is arranged between the two mounting connection arc plates, and the two mounting connection arc plates are in close contact with the side wall of the engine rotating shaft. Covering connection arc plates are fixed at the positions of the centers of the two mounting plates on the covering assembly. The engine rotating shaft is arranged between the two covering connection arc plates, and the covering connection arc plates are not in contact with the side wall of the engine rotating shaft.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] 1. In this installation tooling for the permanent magnet shaft-mounted generator, the stator-rotor module is positioned by the clamping and positioning member, and then the installation cover is used to enhance the accuracy of installing the stator-rotor module on the engine rotating shaft, ensuring the accurate installation of the stator-rotor module. At the same time, when the support member is set to support the clamping and positioning member, it ensures the stable support of the clamping and positioning member for the stator-rotor module. Also, by rotating the adjusting bolt, the adjusting bolt is pushed to move the clamping and positioning member, and the clamping and positioning member drives the stator-rotor module to move, adjusting the air gap size between the stator-rotor module and the engine rotating shaft. In this way, the accurate installation of the stator-rotor module is ensured, and at the same time, the number of times of adjusting the air gap during the installation of the stator-rotor module is reduced, accelerating the installation speed of the shaft-mounted generator.

[0013] 2. In this installation tooling for the permanent magnet shaft-mounted generator, when the clamping and positioning member fixes part of the stator-rotor module on it, first install the pre-fixing member on one side of the clamping and positioning member to clamp and fix the engine rotating shaft, and then through the fixed connection between the pre-fixing member and the clamping and positioning member, the clamping and positioning member and the stator-rotor module are stably fixed on the engine rotating shaft, restricting the axis positions of the stator-rotor module and the clamping and positioning member, improving the accuracy of the air gap during the installation of the stator-rotor module. At the same time, when multiple clamping and positioning members are assembled together, remove the pre-fixing member, and then install the covering component on both sides of the assembled clamping and positioning members, making it convenient for the covering component to be installed with the sealing component, improving the sealing protection level of the device, and ensuring the normal operation of the stator-rotor module. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the combined structure of the clamping and positioning member and the pre-fixing member of the present utility model;

[0015] Figure 2 Schematic diagram of the combined structure of the clamping and positioning member and the stable fixing member of the present utility model;

[0016] Figure 3 Exploded schematic diagram of the combined structure of the clamping and positioning member and the pre-fixing member of the present utility model;

[0017] Figure 4 Exploded schematic diagram of the combined structure of the clamping and positioning member and the stable fixing member of the present utility model;

[0018] Figure 5 Schematic diagram of the combined structure of the clamping and positioning member and the engine rotating shaft of the present utility model;

[0019] Figure 6 Exploded schematic diagram of the combined structure of the clamping and positioning member and the engine rotating shaft of the present utility model;

[0020] Figure 7 Partial exploded schematic diagram of the combined structure of the clamping and positioning member and the stator-rotor module of the present utility model;

[0021] Figure 8 This is a schematic diagram of the structure of the pre-fixing member of the utility model;

[0022] Figure 9 This is one of the schematic diagrams of the cover assembly structure of the utility model;

[0023] Figure 10 This is the second schematic diagram of the cover assembly structure of the utility model;

[0024] Figure 11 It is a schematic diagram of the installation structure of several tooling combinations of the utility model.

[0025] The meaning of each number in the figure is:

[0026] 1. Clamping and positioning member; 11. Clamping ring; 12. External stop groove; 13. Connecting plate; 14. End plate; 15. Attachment plate; 16. Base frame; 17. Support plate; 18. Adjusting bolt;

[0027] 2. Install the cover; 21. Install the plate; 22. External stop groove arc plate; 23. Cover the connecting arc plate; 24. Install the connecting arc plate;

[0028] 3. Stator and rotor modules;

[0029] 4. Engine shaft. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0033] Embodiment 1

[0034] In order to reduce the difficulty of adjusting the air gap when installers install the shaft-mounted generator, ensure the concentric setting of the stator and rotor of the generator, and speed up the installation speed of the shaft-mounted generator, please refer to Figures 1-4 As shown, the purpose of this embodiment is to provide a permanent magnet shaft-mounted generator installation tooling, which includes a number of mutually combined clamping and positioning members 1. The clamping and positioning members 1 can be assembled with each other. An engine rotating shaft 4 is arranged inside the clamping and positioning member 1. The engine rotating shaft 4 is the power shaft on the engine. A stator-rotor module 3 is installed on the engine rotating shaft 4. The stator-rotor module 3 is arranged inside the clamping and positioning member 1. The clamping and positioning member 1 positions the stator-rotor module 3 so that the stator-rotor module 3 can be fixed on the engine rotating shaft 4. At the same time, the stator-rotor module 3 formed by combining multiple components can work stably. At the same time, an installation cover 2 is arranged on the side of the clamping and positioning member 1. The installation cover 2 shields the stator-rotor module 3. Among them, the installation cover 2 includes a pre-fixing member and a stable fixing member. The pre-fixing member is used to provide an installation space for the stator-rotor module 3 through the clamping and positioning member 1 and the installation cover 2 during the installation of the stator-rotor module 3, ensuring the accurate installation of the stator-rotor module 3. At the same time, the pre-fixing member is also used to limit the installation position of the stator-rotor module 3, ensuring that the installed stator-rotor module 3 and the engine rotating shaft 4 are concentrically arranged, and improving the concentric accuracy between the installed stator-rotor module 3 and the clamping and positioning member 1.

[0035] The clamping and positioning member 1 includes two combined parts. The two combined parts are combined together to form a ring shape adapted to the stator-rotor module 3. The two combined parts position the stator-rotor module 3. A support member is arranged on the lower side of the combined part. The support member is installed on the hull and supports the combined part. At the same time, the support member adjusts the position of the two combined parts. By adjusting the combined part through the support member, the clamping and positioning member 1 drives the stator-rotor module 3 to move, adjusting the size of the air gap between the stator-rotor module 3 and the engine rotating shaft 4. In this way, the accurate installation of the stator-rotor module 3 is ensured. At the same time, the number of times of adjusting the air gap during the installation of the stator-rotor module 3 is reduced, and the installation speed of the shaft-mounted generator is accelerated.

[0036] The above-described effects are described in detail below. To achieve the above effects, please refer to Figures 1-10As shown in the figure, the assembly includes a clamping ring 11 in the shape of a semi-circular ring. The two ends of the two clamping rings 11 are in contact with each other to form a ring. The stator-rotor module 3 is installed between the two clamping rings 11. End plates 14 are fixed to the outer side walls at both ends of the clamping ring 11. When the two ends of the two clamping rings 11 are in contact, the end plates 14 located at both ends of the clamping ring 11 on the two clamping rings 11 are in contact with each other, and the two mutually contacting end plates 14 are connected by screws, forming a cylindrical space between the two clamping rings 11. The stator-rotor module 3 is restricted by the cylindrical space to ensure that the stator-rotor module 3 is within the clamping ring 11.

[0037] At the same time, the pre-fixing member is used to pre-fix the positions of the stator-rotor module 3 and the engine rotating shaft 4 inside the clamping and positioning member 1, so that when the stator-rotor module 3 is installed on the engine rotating shaft 4, the stator-rotor module 3 and the engine rotating shaft 4 are concentrically installed. The stabilizing fixing member is used to seal both sides of the clamping and positioning member 1 after the clamping and positioning member 1, the stator-rotor module 3, and the engine rotating shaft 4 are installed, so that the stabilizing fixing member covers both sides of the clamping ring 11 to prevent external debris from entering the stator-rotor module 3 and affecting the normal rotation of the stator-rotor module 3. The stabilizing fixing member includes two covering components. Both the pre-fixing member and the covering component include two mounting plates 21. An outer stop groove arc plate 22 is fixed to the outer side wall of the mounting plate 21. The two mounting plates 21 are combined to form a circle, and the two mounting plates 21 are fixedly connected by screws. Outer stop grooves 12 are provided on both side walls of the clamping ring 11. The outer stop groove arc plate 22 is arranged in the outer stop groove 12, and the outer stop groove arc plate 22 and the outer stop groove 12 are fixed together by screws, so that the pre-fixing member seals one side of the cylindrical space formed by the two clamping rings 11. At this time, a space for placing the stator-rotor module 3 is formed between the two clamping rings 11 and the pre-fixing member. At the same time, an installation connection arc plate 24 is fixed at the center position of the two mounting plates 21 on the pre-fixing member. The engine rotating shaft 4 is arranged between the two installation connection arc plates 24, and the two installation connection arc plates 24 are in close contact with the side wall of the engine rotating shaft 4. When the two installation connection arc plates 24 are in close fit with the engine rotating shaft 4, the pre-fixing member is stably fixed on the engine rotating shaft 4, and through the fit of the installation connection arc plate 24 and the engine rotating shaft 4, the pre-fixing member and the engine rotating shaft 4 are concentrically arranged. After the pre-fixing member and the engine rotating shaft 4 are concentrically arranged, the clamping and positioning member 1 and the stator-rotor module 3 fixed together with the pre-fixing member will also be driven by the pre-fixing member to be concentric with the engine rotating shaft 4. In this way, during the installation of the stator-rotor module 3, the concentric accuracy of the stator-rotor module 3 and the engine rotating shaft 4 during installation is improved.

[0038] Before the installation of the pre-fixing piece, the stator-rotor module 3 inside the clamping ring 11 mainly installs the stator part. After the pre-fixing piece is installed, the support piece is then installed on the lower side of the clamping ring 11 to support the clamping ring 11 and ensure the stable support of the clamping ring 11 for the stator-rotor module 3. Among them, the support piece includes a base frame 16, a support plate 17 is fixed on the top of the base frame 16, a receiving plate 15 is connected to the upper side of the support plate 17 by screws, and the receiving plate 15 is fixed on the outer side wall of the clamping ring 11. The base frame 16 is fixed to the hull by screws. By the support frame, the adjustment difficulty increased by the uneven cabin floor is eliminated, ensuring that when the stator-rotor module 3 is installed into the clamping and positioning piece 1, there is a flat installation plane, ensuring the concentricity of the stator-rotor module 3 and the engine rotating shaft 4 after being installed into the clamping and positioning piece 1, and reducing the adjustment times of the air gap between the stator-rotor module 3 and the engine rotating shaft 4. At the same time, a limiting block is fixed at one end of the upper side of the support plate 17 away from the clamping ring 11. An adjusting bolt 18 is threadedly connected to the limiting block, and one end of the adjusting bolt 18 contacts the side wall of the receiving plate 15. When the adjusting bolt 18 rotates, it pushes the receiving plate 15. By the pushing of the adjusting bolt 18 on the receiving plate 15, the receiving plate 15 drives the whole of the clamping and positioning piece 1 to move horizontally. By the horizontal movement of the clamping and positioning piece 1, the clamping and positioning piece 1 drives the stator in the stator-rotor module 3 to adjust the air gap, so that the stator-rotor module 3 and the engine rotating shaft 4 are concentrically arranged, ensuring the stable rotation of the stator-rotor module 3.

[0039] After the support piece adjusts the concentricity of the stator-rotor module 3 and the engine rotating shaft 4, the worker then installs the rotor part of the stator-rotor module 3 and other components inside the clamping and positioning piece 1. After the components of the stator-rotor module 3 are installed, the pre-fixing piece is removed from one side of the clamping and positioning piece 1, and then the covering assembly is arranged on both sides of the clamping and positioning piece 1. Among them, a covering connection arc plate 23 is fixed at the center position of the two mounting plates 21 on the covering assembly. The engine rotating shaft 4 is arranged between the two covering connection arc plates 23, and the covering connection arc plate 23 does not contact the side wall of the engine rotating shaft 4. At this time, there is a gap between the covering connection arc plate 23 and the engine rotating shaft 4, and a sealing strip is added to the gap to improve the sealing performance of the whole device and prevent foreign substances from entering the stator-rotor module 3 and affecting the normal operation of the stator-rotor module 3.

[0040] When the clamping and positioning piece 1 fixes part of the stator-rotor module 3 on the clamping and positioning piece 1, by first installing the pre-fixing piece on one side of the clamping and positioning piece 1 to clamp and fix the engine rotating shaft 4 with the pre-fixing piece, and then fixedly connecting the pre-fixing piece and the clamping and positioning piece 1, the clamping and positioning piece 1 and the stator-rotor module 3 are stably fixed on the engine rotating shaft 4, restricting the axial positions of the stator-rotor module 3 and the clamping and positioning piece 1, improving the accuracy of the air gap during the installation of the stator-rotor module 3. At the same time, when multiple clamping and positioning pieces 1 are assembled together, such as Figure 11As shown, remove the pre-fastening piece, and then install the covering component on both sides of the combined clamping and positioning piece 1, so that the covering component is convenient for installing with the sealing component, improving the sealing protection level of the device and ensuring the normal operation of the stator-rotor module 3.

[0041] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet shaft-mounted generator installation tooling, comprising a number of mutually combined clamping and positioning members (1). An engine rotating shaft (4) is arranged inside the clamping and positioning member (1). A stator-rotor module (3) is installed on the engine rotating shaft (4). The stator-rotor module (3) is arranged inside the clamping and positioning member (1), and the clamping and positioning member (1) positions the stator-rotor module (3). At the same time, an installation cover (2) is arranged on the side of the clamping and positioning member (1), and the installation cover (2) shields the stator-rotor module (3). It is characterized in that: The clamping and positioning member (1) includes two components. The two components are combined together to form a ring shape adapted to the stator-rotor module (3). The two components position the stator-rotor module (3). A support member is provided on the lower side of the component. The support member is installed on the hull and supports the component. At the same time, the support member adjusts the positions of the two components.

2. The permanent magnet shaft-mounted generator installation tooling according to claim 1, characterized in that: The component includes a clamping ring (11) in the shape of a semi-circular ring. End plates (14) are fixed to the outer side walls at both ends of the clamping ring (11). The two ends of the two clamping rings (11) are in contact with each other to form a ring. The stator-rotor module (3) is installed between the two clamping rings (11). When the two ends of the two clamping rings (11) are in contact, the end plates (14) located at the two ends of the clamping ring (11) on the two clamping rings (11) are in contact with each other, and the two mutually contacting end plates (14) are connected by screws.

3. The permanent magnet shaft-mounted generator installation tooling according to claim 2, characterized in that: The support member includes a base frame (16). A support plate (17) is fixed to the top of the base frame (16). A receiving plate (15) is connected to the upper side of the support plate (17) by screws. The receiving plate (15) is fixed to the outer side wall of the clamping ring (11). The base frame (16) is fixed to the hull by screws.

4. The permanent magnet shaft-mounted generator installation tooling according to claim 3, characterized in that: A limiting block is fixed to one end of the upper side of the support plate (17) away from the clamping ring (11). An adjusting bolt (18) is threadedly connected to the limiting block. One end of the adjusting bolt (18) contacts the side wall of the receiving plate (15). The adjusting bolt (18) pushes the receiving plate (15) when rotated.

5. The permanent magnet shaft-mounted generator installation tooling according to claim 2, characterized in that: The mounting cover (2) includes a pre-fixing member and a stable fixing member. The pre-fixing member is used to pre-fix the positions of the stator-rotor module (3) and the engine rotating shaft (4) inside the clamping and positioning member (1). The stable fixing member is used to seal both sides of the clamping and positioning member (1) after the clamping and positioning member (1), the stator-rotor module (3), and the engine rotating shaft (4) are installed.

6. The permanent magnet shaft-mounted generator installation tooling according to claim 5, characterized in that: The stable fixing member includes two covering components. Both the pre-fixing member and the covering components include two mounting plates (21). An outer stop groove arc plate (22) is fixed to the outer side wall of the mounting plate (21). The two mounting plates (21) are combined to form a circle, and the two mounting plates (21) are fixedly connected by screws. Outer stop grooves (12) are formed on both side walls of the clamping ring (11). The outer stop groove arc plate (22) is arranged in the outer stop groove (12), and the outer stop groove arc plate (22) and the outer stop groove (12) are fixed together by screws.

7. The permanent magnet shaft-mounted generator installation tooling according to claim 6, wherein: Mounting connection arc plates (24) are fixed at the centers of the two mounting plates (21) of the pre-fixing member. The engine rotating shaft (4) is arranged between the two mounting connection arc plates (24), and the two mounting connection arc plates (24) are in close contact with the side wall of the engine rotating shaft (4). Covering connection arc plates (23) are fixed at the centers of the two mounting plates (21) of the covering component. The engine rotating shaft (4) is arranged between the two covering connection arc plates (23), and the covering connection arc plates (23) are not in contact with the side wall of the engine rotating shaft (4).