A drilling tooling for the end cover of an electric motor

Abstract

The present invention belongs to the technical field of motor end cover processing, and discloses a drilling tooling for a motor end cover, which includes a frame. A drill bit is provided on the frame. A first moving frame capable of moving horizontally is provided on the frame. A support pipe is fixedly connected to the first moving frame. A support disk is rotatably sleeved outside the support pipe. A collar is horizontally slidably connected to one side of the support pipe. An air inlet pipe is communicated with one side of the support pipe. A moving pipe is slidably connected in the support pipe. Air vent holes are formed in the moving pipe. A first pipeline and a second pipeline capable of communicating with the moving pipe are formed in the support disk. Centering blocks are slidably arranged at the ends of the first pipeline and the second pipeline. The moving pipe is fixedly connected with a push rod. A support block is slidably connected to the side of the support pipe away from the air inlet pipe. The push rod can push the support block to move along the radial direction of the support pipe. An extrusion block capable of pushing the end cover is fixedly connected to the support block. The present invention has the effect of improving the drilling quality and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of motor end cover processing, and particularly relates to a drilling tooling for motor end covers. Background Art

[0002] A three-phase asynchronous motor is a type of motor applied in industry and daily life. It is powered by a three-phase AC power supply and achieves rotational motion through the principle of electromagnetic induction. A three-phase asynchronous motor is a type of motor that is powered by simultaneously connecting to a 380V three-phase AC power supply with a 120-degree phase difference. Since the rotor of the three-phase asynchronous motor rotates in the same direction as the stator rotating magnetic field but at a different speed, there is a slip rate, so it is called a three-phase asynchronous motor.

[0003] During the assembly process of the motor, the motor end cover plays a role in protection and enclosure. To ensure the fixation and installation of the end cover with other components, it is usually necessary to drill holes in the motor end cover. The holes on the side of the end cover are used to install components such as screws and brackets, and a drilling tooling is required during the drilling process.

[0004] Refer to Figure 1 , when drilling the existing motor end cover, first, the motor end cover is sleeved on the drilling tooling, then the worker manually holds the motor end cover and drills. After drilling, the drilling tooling is rotated to make the motor end cover rotate accordingly, and then drilling is performed on it again. Refer to the Chinese patent document with the publication number CN222344266U, which discloses a punching device for a three-phase asynchronous motor end cover. It determines the punching position through a laser spotlight and clamps and fixes the end cover through a clamping mechanism.

[0005] In view of the above-related technologies, during the drilling process, after placing the motor end cover on the drilling tooling, the worker needs to continuously adjust the position of the motor end cover and then drill, which will affect the quality of the motor end cover. Then, the above process is repeated to drill the remaining drilling positions of the motor end cover, which is not conducive to improving efficiency. Moreover, in the patent document, the laser spotlight is used to determine the drilling position, and the position of the end cover needs to be continuously adjusted to cooperate with the laser spotlight to determine the punching position, which is also not conducive to improving work efficiency. Summary of the Invention

[0006] In view of this, the present invention provides a drilling tooling for motor end covers, aiming to solve the problems of inaccurate positioning and low efficiency of motor end covers in the prior art.

[0007] In order to solve the above technical problems, the present invention provides a motor end cover drilling tool, comprising a frame, the frame is provided with a drill bit for drilling the end cover, the frame is provided with a movable frame that can move laterally, the movable frame is fixedly connected to a support tube, a support plate is rotatably sleeved on the outside of the support tube, and a ring is slidably connected to one side of the support tube; one side of the support tube is connected to an air intake pipe, and a movable tube is slidably connected inside the support tube, a vent hole is provided on the movable tube, a first pipeline and a second pipeline that can be connected to the movable tube are provided in the support plate, and a centering block is slidably provided at the ends of the first pipeline and the second pipeline; the movable tube is fixedly connected to a push rod, and a support block is slidably connected to the side of the support tube away from the air intake pipe, the push rod can push the support block to move along the radial direction of the support tube, and the support block is fixedly connected to an extrusion block that can push the end cover.

[0008] By adopting the above technical solution, when drilling a hole in the motor end cover, first insert the collar into the center hole of the motor end cover, the motor pushes the collar to move, then introduces air into the intake pipe, the airflow enters the moving pipe, and enters the first pipe through the moving pipe, and then the airflow pushes the centering block to move. As the centering blocks on both sides move, the two centering blocks can push the reinforcement ribs of the motor end cover and center it, so as to facilitate drilling the reinforcement ribs of the motor end cover and improve the accuracy of the drilling position; then continue to intake air into the intake pipe, the airflow will push the moving pipe to move, and the movement of the moving pipe can drive the push The rod moves, and the push rod will abut against the support block during the movement, and then push the support block to move in the radial direction of the motor end cover, so as to abut the motor end cover and improve the stability when drilling it. The support block can drive the extrusion block to move together when moving, and the extrusion block abuts against the motor end cover and pushes the motor end cover to move to achieve axial positioning of the motor end cover; the motor end cover can be positioned with the cooperation of the centering block and the extrusion block to ensure the accuracy of the drilling position of the motor end cover, and there is no need for the staff to frequently adjust the position of the motor end cover, which is beneficial to improving its processing efficiency.

[0009] Optionally, a first rotation source is fixedly installed on the frame, and a movable frame 2 is vertically slidably connected to the frame. The first rotation source can drive the movable frame 2 to move, and a second rotation source is installed on the movable frame 2. The driving shaft of the second rotation source is fixedly connected to a collet, and the drill bit is set on the collet.

[0010] By adopting the above technical solution, when the drill bit needs to drill a hole in the motor end cover, the drill bit can be moved in the vertical direction through the cooperation of the first rotation source and the movable frame 2, and the drill bit can be rotated through the second rotation source to facilitate drilling the motor end cover.

[0011] Optionally, a push plate is provided under the collet, a return spring is fixedly connected between the push plate and the bottom of the collet, a push frame is vertically slidably connected to the top of the movable frame, a limiting rod is horizontally slidably connected to the upper portion of the movable frame, and a limiting hole is provided on the support plate that matches the limiting rod.

[0012] By adopting the above technical solution, when the drilling position needs to be quickly adjusted, the side of the limiting rod close to the support disk is set to a hemispherical shape. When the support disk is rotated, one end of the hemispherical limiting rod can be extended into the limiting hole. At this time, the position of the motor end cover can be preliminarily adjusted to facilitate the subsequent precise positioning of the motor end cover, which is conducive to improving work efficiency; when the drilling is completed, the supporting disk can be rotated to retract the limiting rod. When the spherical end of the limiting rod enters the limiting hole again, the rotation is stopped, and the next drilling position can be preliminarily positioned to facilitate improving drilling efficiency.

[0013] Optionally, the outer side wall of the limiting rod is fixedly connected to a support plate, and a second return spring is fixedly connected between the support plate and the movable frame.

[0014] By adopting the above technical solution, the arrangement of the support plate and the return spring can enable the limiting rod to be extended and retracted along the axial direction of the support plate, so as to quickly achieve the initial positioning of the motor end cover.

[0015] Optionally, a support frame is fixedly connected to the frame, and a third rotation source is fixedly connected to the support frame, and the third rotation source can drive the movable frame to move horizontally.

[0016] By adopting the above technical solution, the position of the movable frame 1 can be adjusted by starting the third rotation source, so as to reduce the error generated after long-term use of the equipment, thereby ensuring the quality of the product.

[0017] Optionally, the pushing frame includes a pressure plate and an extrusion rod. The pressure plate is vertically slidably connected to the top of the movable frame one. A return spring three is fixedly connected between the pressure plate and the movable frame one. The extrusion rod is fixedly connected to one side of the pressure plate. When the extrusion rod moves downward, it can squeeze the limiting rod to move horizontally.

[0018] By adopting the above technical solution, the push plate abuts against the pressure plate during the downward movement, and then the push plate pushes the pressure plate downward, the pressure plate moves downward and drives the extrusion rod to move downward, and the extrusion rod abuts against the limiting rod during the downward movement, and pushes the limiting rod to move into the limiting hole.

[0019] Optionally, a first pressing surface is provided on one side of the push rod close to the support block, a first pressed surface matching the pressing surface is provided on the support block, a second pressing surface is provided at the bottom of the extrusion rod, a second pressed surface is provided on one side of the limiting rod, and a third pressing surface is provided on the extrusion block. When the first pressing surface pushes against the first pressed surface, the support block can move to tightly press against the end cover. When the second pressing surface pushes against the second pressed surface, the limiting rod can move into the limiting hole. The third pressing surface can push the end cover to move.

[0020] By adopting the above technical solution, the cooperation between the first pressing surface and the first pressed surface can enable the support block to move away from the central axis direction of the support pipe during the horizontal movement of the push rod. The cooperation between the second pressing surface and the second pressed surface can enable the limiting rod to move towards the direction close to the support disc during the downward movement of the extrusion rod. The cooperation between the third pressing surface and the motor end cover can enable the motor end cover to move towards the direction close to the support disc when the support block moves away from the central axis direction of the support pipe, so as to quickly carry out the preparation work.

[0021] Optionally, a connecting plate is fixedly connected to one side of the support pipe. A fourth return spring is fixedly connected between the support block and the connecting plate, and a fifth return spring is fixedly connected between the collar and the support pipe.

[0022] By adopting the above technical solution, the setting of the fourth return spring can reset the support block after drilling is completed, so as to facilitate the preparation for the next drilling work. The setting of the fifth return spring can reset the collar after drilling is completed, so as to improve the work efficiency.

[0023] Optionally, a first lead screw is fixedly connected to the driving shaft of the first rotating source. The second moving frame is threadedly connected to the first lead screw. A second lead screw is fixedly connected to the driving shaft of the third rotating source. The second lead screw is threadedly connected to the first moving frame.

[0024] By adopting the above technical solution, the rotation of the first lead screw and the second lead screw can enable the movement of the second moving frame and the first moving frame, and it has the advantages of high efficiency and precise positioning.

[0025] Optionally, the drill bit is detachably connected to the collet.

[0026] By adopting the above technical solution, holes with various diameters can be drilled by replacing the drill bit, which is beneficial to improving the applicability of the device.

[0027] In summary, compared with the prior art, the present invention includes at least one of the following beneficial technical effects:

[0028] 1. The action of the air flow can first center the motor end cover to improve the drilling accuracy. Then, further air flow is introduced to complete the tightening of the motor end cover. At the same time, it can also push the motor end cover to move to achieve the axial positioning of the motor end cover, which is beneficial to improving the drilling quality.

[0029] 2. The setting of the limiting rod can facilitate the operator to initially position the drilling position of the motor end cover, which is convenient for the operation of the staff and beneficial to improving the work efficiency. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the motor end cover;

[0031] Figure 2 is a schematic diagram of the overall structure of the embodiment of the present invention;

[0032] Figure 3 is a schematic structural diagram of the assembly of the vertical plate and the support disk in the embodiment of the present invention;

[0033] Figure 4 is a schematic structural diagram of the collar in the embodiment of the present invention;

[0034] Figure 5 is a schematic structural diagram of the assembly of the centering block and the support disk in the embodiment of the present invention;

[0035] Figure 6 is a cross-sectional view of the support disk in the embodiment of the present invention;

[0036] Figure 7 is a schematic structural diagram of the support block in the embodiment of the present invention;

[0037] Figure 8 In the embodiment of the present invention Figure 3 is a partial enlarged view of area A.

[0038] Description of the reference numerals: 1. Frame; 11. Drill bit; 12. First moving frame; 121. Support frame; 122. Third rotating source; 123. Second lead screw; 124. Vertical plate; 13. Support pipe; 131. Connecting plate; 132. Fourth return spring; 14. Support disc; 15. Collar; 151. Fifth return spring; 2. Air inlet pipe; 21. Moving pipe; 22. Vent hole; 23. First pipeline; 24. Second pipeline; 25. Centering block; 26. Push rod; 261. First pressing surface; 27. Support block; 271. First pressed surface; 28. Extrusion block; 281. Third pressing surface; 3. First rotating source; 31. Second moving frame; 32. Second rotating source; 33. Collet; 34. First lead screw; 4. Push plate; 41. First return spring; 42. Push frame; 421. Pressing plate; 422. Extrusion rod; 423. Second pressing surface; 424. Third return spring; 43. Limiting rod; 431. Support plate; 432. Second return spring; 433. Second pressed surface; 44. Limiting hole. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the Figures 1 - 8 of the embodiments of the present invention.

[0040] Refer to Figure 2 , Figure 3 and Figure 4, the present invention provides a drilling tooling for a motor end cover, including a frame 1, a drill bit 11 for drilling the motor end cover, an air inlet pipe 2, an adjusting mechanism for centering the motor end cover, and a positioning mechanism for fixing the motor end cover. The frame 1 is placed on a horizontal plane, and a first rotating source 3 is fixedly installed on the frame 1. In this embodiment, the first rotating source 3 is a motor. In other embodiments, the first rotating source 3 can also be a rotating cylinder or a hydraulic motor, etc., a device whose driving shaft can rotate. The driving shaft of the first rotating source 3 is fixedly connected to a first lead screw 34, and the first lead screw 34 is threadedly connected to a second moving frame 31. A second rotating source 32 is fixedly installed on the second moving frame 31, and the driving shaft of the second rotating source 32 is fixedly connected to a collet 33. The drill bit 11 is detachably connected to the collet 33 for easy replacement. By introducing air flow into the air inlet pipe 2, the adjusting mechanism and the positioning mechanism can be made to work. A support frame 121 is fixedly connected to the frame 1, and a third rotating source 122 is fixedly installed on the support frame 121. The driving shaft of the third rotating source 122 is fixedly connected to a second lead screw 123, and the second lead screw 123 is threadedly connected to a first moving frame 12 that can be slidably connected horizontally. A vertical plate 124 is fixedly connected to the first moving frame 12, and a support pipe 13 is fixedly connected to the first moving frame 12. A support disk 14 is rotatably sleeved outside the support pipe 13. A collar 15 for inserting into the center hole of the motor end cover is slidably connected horizontally on the side of the support disk 14 away from the air inlet pipe 2. A fifth return spring 151 is fixedly connected between the collar 15 and the support pipe 13 to achieve the return of the collar 15.

[0041] When drilling the motor end cover is required, first insert the collar 15 into the center hole of the motor end cover and push the collar 15 to move towards the direction close to the air inlet pipe 2. Then introduce air flow into the air inlet pipe 2. Next, the adjusting mechanism starts to work to center the motor end cover. Then continue to introduce air flow, and the positioning mechanism starts to work to position and fix the motor end cover. Then start the second rotating source 32 to drive the collet 33 to rotate, and the drill bit 11 rotates together with the collet 33. Then start the first rotating source 3 to drive the first lead screw 34 to rotate, and the rotation of the first lead screw 34 can drive the second moving frame 31 to move downward, so that the drill bit 11 drills the motor end cover.

[0042] Refer to Figure 3 , Figure 5 and Figure 6, The adjusting mechanism includes a moving tube 21, a ventilation hole 22, a first pipeline 23, a second pipeline 24 and a centering block 25; the moving tube 21 is horizontally and slidably connected inside the support tube 13, and a ventilation hole 22 is formed in the tube wall of the moving tube 21. Both the first pipeline 23 and the second pipeline 24 are formed inside the support disk 14, and the first pipeline 23 is connected to the second pipeline 24. A hole is formed in the support tube 13 to connect the moving tube 21 with the first pipeline 23 and the second pipeline 24. There are two centering blocks 25, which are respectively arranged at the ends of the first pipeline 23 and the second pipeline 24. Limit rings are arranged inside the first pipeline 23 and the second pipeline 24 to limit the movement of the centering block 25. By arranging a return spring between the limit ring and the centering block 25, the reset of the centering block 25 can be achieved.

[0043] When it is necessary to center the motor end cover, air flow is introduced into the air inlet pipe 2. The air flow enters the support tube 13 and flows into the moving tube 21. Then the air flow flows from the ventilation hole 22 to the first pipeline 23 and the second pipeline 24. Along with the flow of the air flow, the air flow will push the centering block 25 to move. During the movement of the centering block 25, it will abut against the reinforcing rib of the motor end cover, and then the centering block 25 will push against the reinforcing rib of the motor end cover and make the motor end cover rotate, so as to facilitate the adjustment of the drilling position of the motor end cover, which is beneficial to drill holes on the reinforcing rib of the motor end cover.

[0044] Refer to Figure 3 and Figure 7 , The fixing mechanism includes a push rod 26, a support block 27 and an extrusion block 28. The push rod 26 is fixedly connected to the side of the moving tube 21 away from the air inlet pipe 2. The support block 27 is vertically and slidably connected inside the support tube 13. A connecting plate 131 is fixedly connected to the side of the support tube 13 away from the air inlet pipe 2. A fourth return spring 132 is fixedly connected between the support block 27 and the connecting plate 131 to achieve the reset of the support block 27. In this embodiment, three support blocks 27 are provided. In other embodiments, the number can be selected according to actual needs. A first pressing surface 261 is formed on the side of the push rod 26 close to the support block 27, and the first pressing surface 261 is a conical surface. A first pressed surface 271 is formed on the side of the support block 27 close to the push rod 26, and the first pressed surface 271 is set as an arc surface. When the push rod 26 moves towards the support block 27, the push rod 26 can push the support block 27 to move so that it moves along the radial direction of the support tube 13. The extrusion block 28 is fixed on the side wall of the support block 27, and a third pressing surface 281 is formed on the side wall of the extrusion block 28 close to the push rod 26. When the support block 27 moves, it can press tightly against the electric end cover to fix the motor end cover, and at the same time, through the third pressing surface 281, it can push the motor end cover to move along the axial direction of the support tube 13 to achieve the axial positioning of the motor end cover.

[0045] When the motor end cover needs to be fixed and positioned, as the airflow from the intake pipe 2 continues to flow in, the airflow can push the movable tube 21 to move, and the movable tube 21 can drive the push rod 26 to move together during the movement, and the push rod 26 pushes the support block 27 to move during the movement. As the support block 27 moves, the three support blocks 27 cooperate with each other to fix the position of the motor end cover. At the same time, the extrusion block 28 moves together with the support block 27, and can push the motor end cover toward the support disk 14 through the pressure surface three 281 to achieve axial positioning of the motor end cover, which is conducive to drilling the motor end cover.

[0046] Reference Figure 3 and Figure 8 The bottom of the collet 33 is fixedly connected to a return spring 41, and the return spring 41 surrounds the outside of the drill bit 11. The bottom of the return spring 41 is fixedly connected to the push plate 4, and a hole is provided at the center of the push plate 4 to facilitate the movement of the drill bit 11. The top of the vertical plate 124 is vertically slidably connected to a push frame 42, and the push frame 42 includes a pressure plate 421 and an extrusion rod 422. The pressure plate 421 is slidably connected to the top of the vertical plate 124, and a return spring three 424 is fixedly connected between the pressure plate 421 and the vertical plate 124. A hole for the drill bit 11 to pass through is provided on the pressure plate 421, and the extrusion rod 422 is fixedly connected to the bottom wall of the pressure plate 421 and extends in the vertical direction. A pressure surface 2 423 is provided at the bottom of the extrusion rod 422, and the pressure surface 2 423 is set to an inclined surface. The vertical plate 124 is horizontally slidably connected with a limiting rod 43, and the limiting rod 43 is close to the extrusion rod A second pressure surface 433 is provided on one side of 422, and the second pressure surface 433 is set as an inclined surface. The extrusion rod 422 can abut against the limit rod 43 during the downward movement. As the extrusion rod 422 continues to move, under the action of the second pressure surface 423 and the second pressure surface 433, the extrusion rod 422 can push the limit rod 43 to move in the direction close to the support plate 14. The side of the limit rod 43 close to the support plate 14 is set to be hemispherical and extends out of the vertical plate 124. A limit hole 44 compatible with the limit rod 43 is provided on the support plate 14. In this embodiment, three limit holes 44 are set to provide for drilling three reinforcing ribs of the motor end cover. The outer wall of the limit rod 43 is fixedly connected to the support plate 431, and a second return spring 432 is fixedly connected between the support plate 431 and the movable frame to realize the extension and retraction of the limit rod 43.

[0047] After the support plate 14 is rotated until the spherical part of the limiting rod 43 enters the limiting hole 44, the support plate 14 stops rotating, and then drilling is continued, which is convenient for the operator's operation and improves work efficiency.

[0048] The implementation principle of a motor end cover drilling tool in an embodiment of the present invention is: first, the motor end cover is placed on the ring 15 and the ring 15 is pushed to move, then the support plate 14 is rotated and the spherical part of the limiting rod 43 is extended into the limiting hole 44 on the support plate 14, and then air is introduced into the air intake pipe 2, the air flow enters the support pipe 13 and enters the moving pipe 21, and then the air flow enters the first pipeline 23 and the second pipeline 24 through the through hole, and pushes the centering block 25 to move. During the movement, the centering block 25 can push the reinforcement ribs of the motor end cover to center the motor end cover.

[0049] Then, air flow is continuously introduced into the air intake pipe 2, and the air flow can push the moving tube 21 to move. During the movement, the moving tube 21 drives the push rod 26 to move together. During the movement, the push rod 26 can push the support block 27 to move. During the movement, the support block 27 can tighten the motor end cover. At the same time, the support block 27 can drive the extrusion block 28 to push the motor end cover to move, so as to achieve axial positioning of the motor end cover. Then, the motor end cover is drilled by the drill bit 11. During the downward movement of the drill bit 11, the push plate 4 is driven to move downward together. During the downward movement of the push plate 4, the pressure plate 421 can be pushed downward to move. During the downward movement of the pressure plate 421, the extrusion rod 422 is driven to push the limiting rod 43 to extend into the limiting hole. Then the drill bit 11 drills the motor end cover. Finally, the above process is repeated to drill holes in the remaining positions of the motor end cover.

[0050] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A motor end cover drilling tool, comprising a frame (1), wherein the frame (1) is provided with a drill bit (11) for drilling the end cover, and wherein: The frame (1) is provided with a movable frame (12) capable of moving laterally, a support tube (13) is fixedly connected to the movable frame (12), a support plate (14) is rotatably sleeved on the outside of the support tube (13), and a collar (15) is slidably connected to one side of the support tube (13); One side of the support tube (13) is connected to the air inlet tube (2), a movable tube (21) is slidably connected in the support tube (13), a vent hole (22) is provided on the movable tube (21), a first pipeline (23) and a second pipeline (24) capable of communicating with the movable tube (21) are provided in the support plate (14), and a centering block (25) is slidably provided at the ends of the first pipeline (23) and the second pipeline (24); The movable tube (21) is fixedly connected to a push rod (26), and a support block (27) is slidably connected to the side of the support tube (13) away from the air inlet pipe (2). The push rod (26) can push the support block (27) to move along the radial direction of the support tube (13), and an extrusion block (28) capable of pushing the end cover is fixedly connected to the support block (27).

2. The motor end cover drilling tool according to claim 1, characterized in that: A first rotation source (3) is fixedly mounted on the frame (1), a second movable frame (31) is vertically slidably connected to the frame (1), the first rotation source (3) can drive the second movable frame (31) to move, a second rotation source (32) is mounted on the second movable frame (31), a driving shaft of the second rotation source (32) is fixedly connected to a collet (33), and a drill bit (11) is arranged on the collet (33).

3. The motor end cover drilling tool according to claim 2, characterized in that: A push plate (4) is provided below the collet (33), a return spring (41) is fixedly connected between the push plate and the bottom of the collet (33), a push frame (42) is vertically slidably connected to the top of the movable frame (12), a limiting rod (43) is horizontally slidably connected to the upper portion of the movable frame (12), and a limiting hole (44) is provided on the support plate (14) to match the limiting rod (43).

4. The motor end cover drilling tool according to claim 3, characterized in that: The outer side wall of the limiting rod (43) is fixedly connected to a support plate (431), and a second return spring (432) is fixedly connected between the support plate (431) and the movable frame.

5. The motor end cover drilling tool according to claim 2, characterized in that: The frame (1) is fixedly connected to a support frame (121), and the support frame (121) is fixedly connected to a third rotation source (122). The third rotation source (122) can drive the movable frame (12) to move horizontally.

6. The motor end cover drilling tool according to claim 3, characterized in that: The pushing frame (42) includes a pressing plate (421) and an extrusion rod (422). The pressing plate (421) is vertically slidably connected to the top of the movable frame (12). A return spring (424) is fixedly connected between the pressing plate (421) and the movable frame (12). The extrusion rod (422) is fixedly connected to one side of the pressing plate (421). When the extrusion rod (422) moves downward, it can squeeze the limiting rod (43) to move horizontally.

7. The motor end cover drilling tool according to claim 3, characterized in that: The push rod (26) is provided with a pressure surface (261) on one side close to the support block (27), a pressure surface (271) matched with the pressure surface is provided on the support block (27), a pressure surface (423) is provided at the bottom of the extrusion rod (422), a pressure surface (433) is provided on one side of the limiting rod (43), and a pressure surface (281) is provided on the extrusion block (28). When the pressure surface (261) pushes the pressure surface (271), the support block (27) can be moved to press the end cover tightly. When the pressure surface (423) pushes the pressure surface (433), the limiting rod (43) can be moved into the limiting hole (44), and the pressure surface (281) can push the end cover to move.

8. The motor end cover drilling tool according to claim 1, characterized in that: A connecting plate (131) is fixedly connected to one side of the support tube (13), a return spring (132) is fixedly connected between the support block (27) and the connecting plate (131), and a return spring (151) is fixedly connected between the collar (15) and the support tube (13).

9. The motor end cover drilling tool according to claim 5, characterized in that: The driving shaft of the first rotation source (3) is fixedly connected to the lead screw 1 (34), the movable frame 2 (31) is threadedly connected to the lead screw 1 (34), and the driving shaft of the third rotation source (122) is fixedly connected to the lead screw 2 (123), the lead screw 2 (123) is threadedly connected to the movable frame 1 (12).

10. The motor end cover drilling tool according to claim 2, characterized in that: The drill bit (11) is detachably connected to the collet (33).

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