Positioning fixture for turning motor shafts and clamping method thereof

Abstract

This invention relates to the field of fixture technology, specifically to a positioning fixture for turning a motor shaft, comprising a fixture support platform, a first support plate fixedly disposed at one end of the fixture support platform, a support insertion hole provided on the first support plate, a support limiting plate fixedly disposed on the first support plate above the support insertion hole, a first V-shaped bracket fixedly disposed on the support limiting plate, and an extension mating post fixedly disposed on the support limiting plate, the support limiting plate having an insertion cavity through which the extension mating post passes. This invention also relates to a method for clamping a motor shaft, comprising the following steps: Step 1: placing the motor shaft; Step 2: moving the second V-shaped bracket; Step 3: pressing the motor shaft; Step 4: fixing the end of the motor shaft.

Description

Technical Field

[0001] This invention relates to the field of fixture technology, specifically to a positioning fixture and clamping method for turning a motor shaft. Background Technology

[0002] When machining a motor shaft, a positioning fixture is needed to fix it in place to ensure its stability during the machining process and thus the quality of the machining. Depending on the application requirements, a keyway needs to be cut into the motor shaft to mate with a key on a component, ensuring the component's secure installation. Existing motor shaft positioning fixtures typically clamp and fix the motor shaft from one end, exposing the end to be machined for easy machining. While this one-end clamping method can provide good clamping for longer motor shafts, the cutting force is relatively large because the cutting tool moves downwards during machining. Therefore, when machining parts far from the clamping end, the lack of additional support makes the motor shaft susceptible to internal damage under the cutting force, thus affecting the production quality of the motor shaft. Summary of the Invention

[0003] The purpose of this invention is to provide a positioning fixture and clamping method for turning motor shafts, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A positioning fixture for turning a motor shaft includes a fixture support platform. A first support plate is fixedly mounted at one end of the fixture support platform. The first support plate has a support insertion hole. A support limiting plate is fixedly mounted on the first support plate above the support insertion hole. A first V-shaped bracket is fixedly mounted on the support limiting plate, and an extension mating column is also fixedly mounted on the support limiting plate. An insertion cavity is formed on the support limiting plate, passing through the extension mating column. Support rods are symmetrically fixedly mounted on both sides of the upper end of the support limiting plate. A mounting top plate is fixedly mounted on the upper end of each support rod, and an electric telescopic rod is fixedly mounted on the mounting top plate. A second support plate is fixedly mounted at the other end of the fixture support platform. The second support plate has a mating movable hole. Support side plates are symmetrically fixedly mounted on both sides of the upper end of the second support plate, and mating through holes are formed on each support side plate. A support mounting rod is also fixedly mounted on the second support plate, and an extension lowering sleeve is fixedly mounted on the support mounting rod. A movable auxiliary support positioning mechanism is mounted on the fixture support platform.

[0006] Preferably, the mobile auxiliary support positioning mechanism includes a first support plate, a movable support plate, a second support plate, a pressing positioning plate, and a movable connecting plate. The first support plate is fixedly installed on the electric telescopic rod. A linkage insertion hole is provided on the first support plate, and a mounting plate is fixedly provided at the lower end of the first support plate.

[0007] Preferably, lateral support rods are symmetrically fixed on both sides of the first support plate, and a drooping connecting rod is fixed on the lateral support rod. The lower end of the drooping connecting rod is hinged to a first linkage rod, and a second linkage rod is connected to the end of the first support plate away from the mounting plate. The lower end of the second linkage rod is hinged to a movable mounting plate.

[0008] Preferably, the upper end of the movable bearing plate is hinged to the second linkage rod, and a cavity insertion rod is fixedly provided on the movable bearing plate. The cavity insertion rod is inserted into the insertion cavity, and an insertion plug plate is fixedly provided on the cavity insertion rod. The insertion plug plate is also located in the insertion cavity.

[0009] Preferably, a supporting movable plug is fixedly provided on the movable support plate, the supporting movable plug is inserted into the supporting plug hole, and lateral connecting rods are symmetrically fixed on both sides of the movable support plate, the lateral connecting rods are hinged to the lower end of the first linkage rod.

[0010] Preferably, a supporting top plate is fixedly provided at the upper end of the movable bearing plate, a second V-shaped frame is fixedly provided on the supporting top plate, mounting side plates are symmetrically fixedly provided on both sides of the second V-shaped frame, and mounting insertion holes are provided on the mounting side plates. A supporting movable rod is fixedly provided at the lower end of the movable bearing plate, the supporting movable rod is inserted into the mating movable hole, and a linkage support plate is fixedly provided at the end of the supporting movable rod away from the second V-shaped frame. An upward drive frame is symmetrically fixedly provided on both sides of the linkage support plate.

[0011] Preferably, a second support plate is installed on the second V-shaped frame, a connecting support plate is fixedly installed at the lower end of the second support plate, and a linkage insertion rod is fixedly installed at one end of the second support plate. The linkage insertion rod is inserted into the linkage insertion hole. Installation matching rods are symmetrically fixedly installed on both sides of the second support plate. The installation matching rods are inserted into the installation insertion holes. A pressing positioning plate is fixedly installed on the mounting support plate and the connecting support plate respectively.

[0012] Preferably, auxiliary anti-rotation plates are symmetrically hinged to both sides of the lower end of the pressure positioning plate, and a support block is fixedly provided at the upper end of the pressure positioning plate. A connecting strip is fixedly provided on the support block, and elastic connecting pieces are symmetrically fixed on both sides of the connecting strip. The lower end of the elastic connecting piece is fixed to the auxiliary anti-rotation plate.

[0013] Preferably, the movable connecting plate is mounted on the second supporting upright plate, and support strips are symmetrically fixed on both sides of one end of the movable connecting plate. A supporting base plate is fixedly fixed at the lower end of the support strips, and a limiting frame is fixedly fixed on the supporting base plate. A receiving box is inserted into the limiting frame. Insertion mating rods are symmetrically fixed on both sides of the other end of the movable connecting plate. The insertion mating rods are inserted into mating through holes, and an extension linkage bar is fixedly fixed at the lower end of the insertion mating rod. A mating linkage pin is fixedly fixed at the end of the extension linkage bar away from the insertion mating rod, and the mating linkage pin is inserted into the upward drive frame.

[0014] A method for clamping a motor shaft includes the following steps:

[0015] Step 1: Placement of the motor shaft: Place the motor shaft on the first V-shaped bracket and the second V-shaped bracket;

[0016] Step 2: Movement of the second V-shaped frame: Start the electric telescopic rod to move the second V-shaped frame, thereby providing auxiliary support for the motor shaft;

[0017] Step 3: Pressing the motor shaft: Start the electric telescopic rod to move the first support plate downward, so that the lower positioning plate presses on the motor shaft, thereby pressing and fixing the motor shaft;

[0018] Step 4: Fixing the end of the motor shaft: Under the action of the first support plate, the movable support plate is moved, and then a negative pressure is formed under the action of the plug plate to fix the end of the motor shaft.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a reasonable structural design and strong functionality, and has the following advantages:

[0020] 1. A first V-shaped bracket and a second V-shaped bracket are provided on the fixture support platform. The first V-shaped bracket and the second V-shaped bracket can provide synchronous support for the motor shaft. When the keyway of the motor shaft is being machined, the motor shaft is placed on the first V-shaped bracket and the second V-shaped bracket to provide initial positioning of the motor shaft. Then, the electric telescopic rod is activated to drive the lower positioning plate to move downward, thereby achieving the downward pressing and fixing of the motor shaft.

[0021] 2. When the electric telescopic rod moves downward, it also moves the movable bearing plate, which in turn moves the insertion plug plate. This creates a negative pressure in the insertion cavity, fixing the motor shaft from the end. As the lower positioning plate moves downward, it comes into contact with the motor shaft, and the auxiliary anti-rotation plate also comes into contact with the motor shaft. Under the action of the motor shaft, the plate rotates, compressing the elastic connecting piece. This allows the auxiliary anti-rotation plate to press tightly against the motor shaft, providing auxiliary anti-rotation and further ensuring the stability of the motor shaft. The use of the first and second V-shaped frames can accommodate cutting work on motor shafts of different diameters within a certain range.

[0022] 3. In addition, as the electric telescopic rod moves downward, it will also drive the second V-shaped frame to move towards the cutting end of the motor shaft. This will bring the cutting end of the motor shaft closer to the support point of the motor shaft, providing better support and preventing internal damage to the motor shaft caused by cutting. As the first V-shaped frame moves, it will also push the receiving box upward and insert it into the extended falling sleeve, so that the cut waste can fall along the extended falling sleeve into the receiving box for collection. During the cutting process, the receiving box inserted into the extended falling sleeve can ensure the stability of the receiving box. When not cutting, the receiving box is restricted by the limiting frame, making it easy to remove for cleaning. Attached Figure Description

[0023] Figure 1 A first-person view diagram of the assembly of the fixture support platform.

[0024] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0025] Figure 3 for Figure 1 Enlarged diagram of point B in the middle.

[0026] Figure 4 A second-view schematic diagram of the fixture support platform assembly.

[0027] Figure 5 This is a schematic diagram of the fixture support platform.

[0028] Figure 6 This is a structural schematic diagram of the movable support plate.

[0029] Figure 7 This is a schematic diagram of the movable support plate.

[0030] Figure 8 This is an assembly diagram of the second support plate and the lower positioning plate.

[0031] Figure 9 This is a structural diagram of the movable connecting plate.

[0032] In the diagram: 1. Fixture support platform; 11. First support upright plate; 12. Support insertion hole; 13. Support limiting plate; 14. First V-shaped frame; 15. Extension mating column; 16. Insertion cavity; 17. Support upright; 18. Mounting top plate; 181. Electric telescopic rod; 19. Second support upright plate; 191. Mating movable hole; 192. Support side plate; 193. Mating through hole; 194. Support loading rod; 195. Extension lowering sleeve; 2. First support plate; 21. Linkage insertion hole; 22. Mounting support plate; 23. Lateral support rod; 24. Drooping connecting rod; 25. First linkage mating rod; 26. Second linkage mating rod; 3. Movable support plate; 31. Cavity insertion rod; 32. Insertion 4. Plug plate; 41. Movable support plate; 42. Supporting movable insert rod; 43. Lateral connecting rod; 44. Supporting top plate; 45. Second V-shaped frame; 46. Installing side plate; 47. Installing insertion hole; 48. Supporting movable rod; 49. Linkage support plate; 50. Upward moving drive frame; 61. Second support carrier plate; 52. Connecting support plate; 53. Linkage insertion rod; 64. Installing mating insert rod; 75. Downward positioning plate; 66. Auxiliary anti-rotation plate; 67. Supporting block; 68. Mating connecting strip; 79. Elastic connecting piece; 70. Movable connecting plate; 71. Supporting strip plate; 72. Supporting bottom plate; 73. Limiting frame; 74. Receiving box body; 75. Inserting mating rod; 76. Extending linkage strip; 77. Mating linkage insert post. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1 to 9 The present invention provides a technical solution:

[0035] A positioning fixture for turning a motor shaft includes a fixture support platform 1. A first support plate 11 is fixedly mounted at one end of the fixture support platform 1. A support insertion hole 12 is formed on the first support plate 11. A support limiting plate 13 is fixedly mounted on the first support plate 11 above the support insertion hole 12. A first V-shaped bracket 14 is fixedly mounted on the support limiting plate 13, and an extension mating post 15 is also fixedly mounted on the support limiting plate 13. An insertion cavity 16 is formed on the support limiting plate 13, and the insertion cavity 16 passes through the extension mating post 15. The number of insertion cavities 16 can be set according to actual usage requirements. The upper ends of the support limiting plate 13 are symmetrically fixed on both sides. A support column 17 is fixedly installed, and a mounting top plate 18 is fixedly installed on the upper end of the support column 17. An electric telescopic rod 181 is fixedly installed on the mounting top plate 18. A second support column 19 is fixedly installed at the other end of the clamp support platform 1. The second support column 19 has a mating movable hole 191. Support side plates 192 are symmetrically fixedly installed on both sides of the upper end of the second support column 19. The support side plates 192 have mating through holes 193. A support loading rod 194 is also fixedly installed on the second support column 19. An extension lowering sleeve 195 is fixedly installed on the support loading rod 194. A movable auxiliary support positioning mechanism is installed on the clamp support platform 1.

[0036] The mobile auxiliary support positioning mechanism includes a first support plate 2, a movable support plate 3, a movable support plate 4, a second support plate 5, a pressing positioning plate 6, and a movable connecting plate 7. The first support plate 2 is fixedly installed on the electric telescopic rod 181. The first support plate 2 has a linkage insertion hole 21, and the lower end of the first support plate 2 is fixedly provided with a mounting support plate 22.

[0037] Lateral support rods 23 are symmetrically fixed on both sides of the first support plate 2. A drooping connecting rod 24 is fixed on the lateral support rod 23. A first linkage rod 25 is hinged to the lower end of the drooping connecting rod 24. A second linkage rod 26 is connected to the end of the first support plate 2 away from the mounting plate 22. A movable plate 3 is hinged to the lower end of the second linkage rod 26.

[0038] The upper end of the movable support plate 3 is hinged to the second linkage rod 26, and a cavity insertion rod 31 is fixedly provided on the movable support plate 3. The cavity insertion rod 31 is inserted into the insertion cavity 16, and an insertion plug plate 32 is fixedly provided on the cavity insertion rod 31. The insertion plug plate 32 is also located in the insertion cavity 16, and the diameter of the insertion plug plate 32 is equal to the inner diameter of the insertion cavity 16.

[0039] A movable support rod 41 is fixedly installed on the movable support plate 4. The movable support rod 41 is inserted into the support insertion hole 12. Lateral connecting rods 42 are symmetrically fixed on both sides of the movable support plate 4. The lateral connecting rods 42 are hinged to the lower end of the first linkage rod 25.

[0040] A support top plate 43 is fixedly installed on the upper end of the movable support plate 4. A second V-shaped frame 44 is fixedly installed on the support top plate 43. Mounting side plates 45 are symmetrically fixed on both sides of the second V-shaped frame 44. Mounting side plates 45 are provided with mounting insertion holes 46. A support movable rod 47 is fixedly installed on the lower end of the movable support plate 4. The support movable rod 47 is inserted into the mating movable hole 191. A linkage support plate 48 is fixedly installed on the end of the support movable rod 47 away from the second V-shaped frame 44. An upward drive frame 49 is symmetrically fixed on both sides of the linkage support plate 48. In addition, the inner wall of the upward drive frame 49 is smooth and burr-free.

[0041] A second support plate 5 is installed on the second V-shaped frame 44. A connecting support plate 51 is fixedly installed at the lower end of the second support plate 5, and a linkage insertion rod 52 is fixedly installed at one end of the second support plate 5. The linkage insertion rod 52 is inserted into the linkage insertion hole 21, and the linkage insertion rod 52 and the linkage insertion hole 21 can move relative to each other. Installation mating rods 53 are symmetrically fixedly installed on both sides of the second support plate 5. The installation mating rods 53 are inserted into the installation insertion holes 46. A pressing positioning plate 6 is fixedly installed on the mounting support plate 22 and the connecting support plate 51 respectively, and the lower surface of the pressing positioning plate 6 is smooth and burr-free.

[0042] The lower end of the pressure positioning plate 6 is symmetrically hinged with auxiliary anti-rotation plates 61 on both sides, and the upper end of the pressure positioning plate 6 is fixedly provided with a support block 62. The support block 62 is fixedly provided with a connecting strip 63. The two sides of the connecting strip 63 are symmetrically fixed with elastic connecting pieces 64. The lower end of the elastic connecting piece 64 is fixed on the auxiliary anti-rotation plate 61.

[0043] The movable connecting plate 7 is installed on the second supporting upright plate 19. Support strips 71 are symmetrically fixed on both sides of one end of the movable connecting plate 7. A supporting base plate 72 is fixedly fixed at the lower end of the support strips 71. A limiting frame 73 is fixedly fixed on the supporting base plate 72. A receiving box 74 is inserted into the limiting frame 73. During the milling process, the receiving box 74 is inserted into the extension falling sleeve 195. Insertion mating rods 75 are symmetrically fixed on both sides of the other end of the movable connecting plate 7. Insertion mating rods 75 are inserted into the mating through holes 193. An extension linkage bar 76 is fixedly fixed at the lower end of the insertion mating rod 75. A mating linkage pin 77 is fixedly fixed at the end of the extension linkage bar 76 away from the insertion mating rod 75. The mating linkage pin 77 is inserted into the upward moving drive frame 49 and contacts the inner wall of the upward moving drive frame 49.

[0044] A method for clamping a motor shaft includes the following steps:

[0045] Step 1: Placement of the motor shaft: Place the motor shaft on the first V-shaped bracket 14 and the second V-shaped bracket 44;

[0046] Step 2: Movement of the second V-shaped frame 44: Start the electric telescopic rod 181 to move the second V-shaped frame 44, thereby providing auxiliary support for the motor shaft;

[0047] Step 3: Pressing the motor shaft: Start the electric telescopic rod 181 to drive the first support plate 2 to move downward, so that the lower positioning plate 6 presses on the motor shaft, thereby pressing and fixing the motor shaft.

[0048] Step 4: Fixing the end of the motor shaft: Under the action of the first support plate 2, the movable support plate 3 is moved, and then a negative pressure is formed under the action of the plug plate 32 to fix the end of the motor shaft.

[0049] When positioning the motor shaft, the motor shaft is placed on the first V-shaped bracket 14 and the second V-shaped bracket 44, supported by the V-shaped surface. The V-shaped surface allows for positioning of motor shafts with different diameters within a certain range. Additionally, one end of the motor shaft contacts the inner end face of the bearing limiting plate 13, ensuring the end face of the motor shaft tightly covers the opening of the insertion cavity 16 without completely covering the cavity. Then, the electric telescopic rod 181 is activated, moving the first support plate 2 downwards. As the first support plate 2 moves downwards, the first linkage rod... Under the action of 25, the movable support plate 4 will move, thereby causing the second V-shaped frame 44 to move towards the milled groove end of the motor shaft, so that it can better support the motor shaft when it is close to the milled groove end. As the first support plate 2 moves downward, under the action of the second linkage rod 26, it will drive the movable support plate 3 to move, which will drive the insertion plug plate 32 to move, which can create a negative pressure in the insertion cavity 16, thereby adsorbing and fixing it from the end of the motor shaft. In addition, as the first support plate 2 moves downward, it will also drive the second support plate 5 to move downward. The downward movement of the lower positioning plate 6 causes it to press against the motor shaft, securing it in place. During this downward movement, the auxiliary anti-rotation plate 61 comes into contact with the motor shaft. Under the action of the motor shaft, the auxiliary anti-rotation plate 61 rotates and comes into contact with the motor shaft, compressing the elastic connecting piece 64. This further restricts the rotation of the motor shaft, preventing it from rotating. Additionally, as the moving support plate 4 moves, the upward moving drive frame... The action of 49 will drive the movable connecting plate 7 to move upward, thereby causing the receiving box 74 to be inserted into the extended falling sleeve 195. In this way, during the milling process, the waste chips can fall smoothly into the receiving box 74 for collection. During the cutting process, the receiving box 74 inserted into the extended falling sleeve 195 can ensure the stability of the receiving box 74. When not cutting, the receiving box 74 is restricted by the limiting frame 73, which makes it easy to remove for cleaning. In addition, the cooperation between the receiving box 74 and the extended falling sleeve 195 can avoid making the receiving box 74 too high, which would make it inconvenient to clean its interior.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for turning a motor shaft, comprising a fixture support table (1), characterized in that: One end of the clamp support platform (1) is fixedly provided with a first support plate (11). The first support plate (11) is provided with a support insertion hole (12). A support limiting plate (13) is fixedly provided on the first support plate (11) above the support insertion hole (12). A first V-shaped frame (14) is fixedly provided on the support limiting plate (13). An extension mating column (15) is also fixedly provided on the support limiting plate (13). An insertion cavity (16) is provided on the support limiting plate (13). The insertion cavity (16) passes through the extension mating column (15). Supporting rods (17) are symmetrically fixed on both sides of the upper end of the support limiting plate (13). A mounting top plate is fixedly provided on the upper end of the supporting rods (17). 18), an electric telescopic rod (181) is fixedly installed on the mounting top plate (18), and a second bearing plate (19) is fixedly installed at the other end of the clamp bearing platform (1). The second bearing plate (19) has a mating movable hole (191) and a support side plate (192) is symmetrically fixedly installed on both sides of the upper end of the second bearing plate (19). The support side plate (192) has a mating through hole (193) and a support mounting rod (194) is also fixedly installed on the second bearing plate (19). An extension lowering sleeve (195) is fixedly installed on the support mounting rod (194). A movable auxiliary support positioning mechanism is installed on the clamp bearing platform (1). The movable auxiliary support positioning mechanism includes a first The first support plate (2) consists of a support plate (2), a movable support plate (3), a mobile support plate (4), a second support plate (5), a pressing positioning plate (6), and a movable connecting plate (7). The first support plate (2) is fixedly installed on the electric telescopic rod (181). A linkage insertion hole (21) is provided on the first support plate (2), and a mounting support plate (22) is fixedly installed at the lower end of the first support plate (2). Lateral support rods (23) are symmetrically fixed on both sides of the first support plate (2). A drooping connecting rod (24) is fixedly installed on the lateral support rod (23). A first linkage coupling rod (25) is hinged to the lower end of the drooping connecting rod (24). The end of the first support plate (2) away from the mounting support plate (22) is connected to the first support plate (2). There is a second linkage rod (26), the lower end of which is hinged to a movable bearing plate (3). The upper end of the movable bearing plate (3) is hinged to the second linkage rod (26). A cavity insertion rod (31) is fixedly provided on the movable bearing plate (3). The cavity insertion rod (31) is inserted into the insertion cavity (16). An insertion plug plate (32) is fixedly provided on the cavity insertion rod (31). The insertion plug plate (32) is also located in the insertion cavity (16). A supporting movable insertion rod (41) is fixedly provided on the movable bearing plate (4). The supporting movable insertion rod (41) is inserted into the supporting insertion hole (12). Lateral connecting rods (42) are symmetrically fixed on both sides of the movable bearing plate (4).The lateral connecting rod (42) is hinged to the lower end of the first linkage rod (25). A support top plate (43) is fixedly installed on the upper end of the movable bearing plate (4). A second V-shaped frame (44) is fixedly installed on the support top plate (43). Mounting side plates (45) are symmetrically fixed on both sides of the second V-shaped frame (44). Mounting side plates (45) are provided with mounting insertion holes (46). A support movable rod (47) is fixedly installed on the lower end of the movable bearing plate (4). The support movable rod (47) is inserted into the mating movable hole (191). A linkage support plate (48) is fixedly installed on the end of the support movable rod (47) away from the second V-shaped frame (44). An upward moving drive frame (49) is symmetrically fixed on both sides of the linkage support plate (48).

2. The positioning fixture for turning a motor shaft according to claim 1, characterized in that: The second V-shaped frame (44) is equipped with a second support plate (5). A connecting support plate (51) is fixedly installed at the lower end of the second support plate (5). A linkage plug rod (52) is fixedly installed at one end of the second support plate (5). The linkage plug rod (52) is inserted into the linkage plug hole (21). Installation matching plug rods (53) are symmetrically fixed on both sides of the second support plate (5). The installation matching plug rods (53) are inserted into the installation plug hole (46). A pressing positioning plate (6) is fixedly installed on the mounting support plate (22) and the connecting support plate (51).

3. A positioning fixture for turning a motor shaft according to claim 2, characterized in that: The lower end of the pressure positioning plate (6) is symmetrically hinged with auxiliary anti-rotation plates (61) on both sides, and the upper end of the pressure positioning plate (6) is fixedly provided with a support block (62). The support block (62) is fixedly provided with a connecting strip (63). The two sides of the connecting strip (63) are symmetrically fixed with elastic connecting pieces (64). The lower end of the elastic connecting piece (64) is fixed on the auxiliary anti-rotation plate (61).

4. A positioning fixture for turning a motor shaft according to claim 3, characterized in that: The movable connecting plate (7) is installed on the second supporting upright plate (19), and a support strip plate (71) is symmetrically fixed on both sides of one end of the movable connecting plate (7). A supporting base plate (72) is fixedly installed at the lower end of the support strip plate (71). A limiting frame (73) is fixedly installed on the supporting base plate (72). A receiving box (74) is inserted into the limiting frame (73). A plug-in mating rod (75) is symmetrically fixed on both sides of the other end of the movable connecting plate (7). The plug-in mating rod (75) is inserted into the mating through hole (193), and an extension linkage bar (76) is fixedly installed at the lower end of the plug-in mating rod (75). A mating linkage pin (77) is fixedly installed at the end of the extension linkage bar (76) away from the plug-in mating rod (75). The mating linkage pin (77) is inserted into the upward moving drive frame (49).

5. A method for clamping a motor shaft, characterized in that: This clamping method is applicable to the positioning clamp described in claim 4, and includes the following steps: Step 1: Placement of the motor shaft: Place the motor shaft on the first V-shaped bracket (14) and the second V-shaped bracket (44); Step 2: Movement of the second V-shaped frame (44): Start the electric telescopic rod (181) to drive the second V-shaped frame (44) to move, so as to achieve auxiliary support for the motor shaft; Step 3: Pressing the motor shaft: Start the electric telescopic rod (181) to drive the first support plate (2) to move downward, so that the lower positioning plate (6) presses on the motor shaft, thereby pressing and fixing the motor shaft; Step 4: Fixing the end of the motor shaft: Under the action of the first support plate (2), the movable support plate (3) is moved, and then a negative pressure is formed under the action of the plug plate (32) to fix the end of the motor shaft.

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