A dustproof and waterproof junction box assembly for a permanent magnet synchronous motor

Abstract

This utility model relates to a dustproof and waterproof junction box assembly for a permanent magnet synchronous motor. A mounting frame is detachably mounted on the top of the synchronous motor housing via bolts. Multiple sets of terminals are equidistantly mounted on the bottom inner side of the mounting frame. A sealing cover is detachably mounted on the top of the mounting frame, and a sealing baffle is fixedly mounted on the bottom of the sealing cover, slidingly fitted onto the outer wall of the top of the mounting frame. A transmission frame is fixedly mounted at the middle bottom of the sealing cover. In this utility model, four sets of contact arc plates move synchronously towards one side of the inner wall inside the mounting frame, allowing the outer wall of the contact arc plates to tightly adhere to the outer wall of the cable bent along the inner wall of the mounting frame. This provides resistance from multiple directions to the cable's outer wall, improving the stability of the cable placed inside the mounting frame and preventing the cable from shaking due to vibrations generated by the synchronous motor's operation. This ensures the stability of the connection between the cable and the terminals.

Description

Technical Field

[0001] This utility model relates to the field of junction box technology, specifically to a dustproof and waterproof junction box assembly for a permanent magnet synchronous motor. Background Technology

[0002] A permanent magnet synchronous motor is a type of synchronous motor that uses permanent magnets to establish an excitation magnetic field. It does not require an excitation winding or excitation power supply and is widely used in new energy vehicles, industrial drives, rail transportation and other fields. It is a key device in modern motor systems to achieve energy saving and precision control. In order to facilitate the operation control of synchronous motors, corresponding junction boxes are often set on the surface of their housings. Combined with the internal wiring terminals, grounding bolts and other components of the junction box, it can be used to connect external power supplies, encoder signal lines and control lines, thereby realizing electrical interconnection between the motor and the control system.

[0003] In practical use, traditional junction boxes typically have a sealing cover on top. This cover allows for sealing the top of the junction box while also providing access for internal cable connections. However, to facilitate the connection of cables exiting the synchronous motor to the terminals, the cables are often bent and placed along the inner wall of the junction box. This placement makes it difficult to secure the bent cables from multiple directions. Consequently, vibrations generated by the synchronous motor during operation can easily cause the multiple cables inside the junction box to shake, leading to cable detachment from the terminal connections and affecting the control accuracy of the synchronous motor. Therefore, a new technical solution is needed to address this issue. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to practical needs, and provide a dustproof and waterproof junction box assembly for a permanent magnet synchronous motor. This addresses the problem that current junction boxes have a sealing cover on top, which facilitates sealing the top of the junction box while allowing access to the internal cables. However, to facilitate connection between the cables passing through the synchronous motor and the terminals, the cables are often bent and placed along the inner wall of the junction box. This placement process makes it impossible to further secure the bent cables from multiple directions. Consequently, when the synchronous motor operates, the vibrations transmitted to the inside of the junction box easily cause the multiple cables inside to shake, leading to the cables detaching from the terminals and affecting the control accuracy of the synchronous motor.

[0005] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: a dustproof and waterproof junction box assembly for a permanent magnet synchronous motor is designed, including a synchronous motor housing, an installation frame is detachably installed on the top of the synchronous motor housing by bolts, multiple sets of wiring terminals are equidistantly installed on the bottom inner side of the installation frame, a sealing cover is detachably installed on the top of the installation frame, and a sealing baffle is fixedly installed on the bottom of the sealing cover, and the sealing baffle is slidably sleeved on the outer wall of the top of the installation frame;

[0006] A transmission frame is fixedly installed at the bottom center of the sealing cover plate, and a fixed frame is fixedly installed on the outer wall of the transmission frame. A synchronization mechanism is provided inside the transmission frame, and an adjustment mechanism is provided inside the fixed frame. The adjustment mechanism and the synchronization mechanism are connected in a transmission manner. A fitting arc plate is movably installed on the bottom outer side of the transmission frame, and the adjustment mechanism and the fitting arc plate are connected in a transmission manner.

[0007] Preferably, the synchronization mechanism includes a transmission bevel gear and a follower bevel gear. A rotating rod is vertically mounted inside the middle of the sealing cover plate via a sealing bearing. The transmission bevel gear is fixedly sleeved on the outer side of each rotating rod away from the sealing cover plate. Transmission rods are horizontally mounted on the middle of the four outer sides of the transmission frame via bearings. The follower bevel gear is fixedly sleeved on the top of the side of each transmission rod, and the transmission bevel gear and the follower bevel gear mesh with each other.

[0008] Preferably, the adjusting mechanism includes a rotating lead screw. Each fixed frame has a rotating lead screw installed laterally via a bearing. The top edge of the rotating lead screw is fixedly connected to the top edge of the transmission rod. Each rotating lead screw has a movable sleeve threadedly connected to its outer side. A second transmission frame is fixedly installed at the bottom of the outer side of each movable sleeve. A connecting frame is fixedly installed vertically at the bottom of each second transmission frame. The top edge of the connecting frame is fixedly connected to the outer wall of the fitting arc plate. A limiting groove is opened laterally at the bottom of the fixed frame, and the top of the connecting frame is slidably installed inside the limiting groove.

[0009] Preferably, a first transmission frame is fixedly installed on the top of the rotating rod, and a tightening bolt is vertically screwed into the middle of the side of the first transmission frame by a thread, and the bottom of the tightening bolt is movably attached to the top surface of the sealing cover plate.

[0010] Preferably, a connecting frame is fixedly installed on the bottom side of each fixed frame away from the transmission frame, a first extrusion plate is slidably installed on the top inner side of the connecting frame, a return spring is movably installed inside the connecting frame, a transmission block is fixedly installed on the top surface of the first extrusion plate, and the transmission block is movably installed inside the fixed frame away from the transmission frame, a movable groove is opened on the bottom side of the transmission frame away from the transmission frame, connecting rods are horizontally fixedly installed at both ends of the side of the movable sleeve, a push block is fixedly installed between the top ends of the side of the two sets of connecting rods, a lifting plate is slidably installed between the outer sides of each pair of adjacent connecting frames, a plug-in rod is vertically fixedly installed at the middle bottom of each lifting plate, and a limit slot is opened on the bottom side of each plug-in rod.

[0011] Preferably, guide frames are vertically fixedly installed on the four corner surfaces of the inner side of the mounting frame, and each guide frame has a vertically opened guide groove inside, with the inner diameter of the guide groove being the same as the diameter of the plug rod. Hollow tubes are horizontally fixedly installed on the four outer side walls of the mounting frame, and a second extrusion plate is movably installed inside each hollow tube. A push spring is movably installed inside each hollow tube, and a limit plug is horizontally fixedly installed at the middle of the side of each second extrusion plate, with the limit plug slidingly inserted into the inside of the guide frame.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model features a transmission frame and a fixed frame at the bottom of a sealing cover. The transmission frame contains vertically arranged transmission bevel teeth, and the four sides of the transmission frame contain horizontally arranged follower bevel teeth. When the rotating rod is turned, causing the transmission bevel teeth to rotate synchronously within the transmission frame, the meshing of the transmission and follower bevel teeth drives the four sets of follower bevel teeth to rotate synchronously within the transmission frame. This, in turn, drives the transmission rod connected to the follower bevel teeth to rotate synchronously on the four sides of the transmission frame. Furthermore, the transmission rod, through its connecting action, drives the rotating lead screws located within the four fixed frames to rotate synchronously. Combined with the rotational transmission action of the rotating screw on the transmission sleeve, the movable sleeves located on the four sides of the bottom of the sealing cover can move synchronously relative to each other. Then, under the connecting transmission action of the connecting frame, the four sets of contact arc plates move synchronously towards the inner wall of the mounting frame. This allows the outer wall of the contact arc plate to fit tightly against the outer wall of the cable that is bent along the inner wall of the mounting frame. This provides resistance from multiple directions to the outer wall of the cable, improving the stability of the cable placed inside the mounting frame and preventing the cable from shaking due to the vibration force generated by the synchronous motor. This ensures the stability of the connection between the cable and the terminal block.

[0014] 2. This utility model uses a connecting rod to drive the push block and the movable sleeve, so that when the movable sleeve drives the fitting arc plate to move horizontally, it can simultaneously drive the push block to move horizontally within the fixed frame. Combined with the pushing block's abutting action against the transmission block, it can simultaneously drive the transmission block to move vertically, thus providing a corresponding pushing force to the first pressing plate. This causes the first pressing plate to move vertically within the connecting frame while simultaneously providing a corresponding vertical pushing force to the insertion rod, causing the insertion rod to move downwards synchronously within the guide frame. At the same time, combined with the abutting force of the bottom end of the insertion rod against the limiting insertion rod, the limiting insertion rod moves downwards simultaneously with the insertion rod. The horizontal movement causes the second extrusion plate to move horizontally inside the hollow tube, compressing the push spring and giving it a restoring pushing force. After the insertion rod moves down to the same horizontal position as the limiting slot and the limiting insertion rod on its side, the outer wall of the insertion rod loses its resistance to the limiting insertion rod. Under the restoring pushing force of the push spring, the limiting insertion rod can move back to its original position and be inserted into the limiting slot. This allows the limiting insertion rod to engage with the insertion rod, fixing the position of the limiting insertion rod and the sealing cover plate. This prevents the sealing cover plate from being arbitrarily removed from the top of the mounting frame due to the vibration of the synchronous motor, thus affecting the sealing and protection of the inside of the mounting frame. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0016] Figure 2 This is a bottom view of the sealing cover plate of this utility model;

[0017] Figure 3 This is a front sectional view of the transmission frame and the fixing frame of this utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the hollow tube and guide frame of this utility model;

[0019] In the diagram: 1. Synchronous motor housing; 11. Mounting frame; 12. Sealing cover plate; 13. Sealing baffle; 14. Terminal block; 15. First transmission frame; 16. Tightening bolt; 17. Fitting arc plate;

[0020] 2. Transmission frame; 21. Fixed frame; 22. Rotating rod; 23. Transmission bevel gear; 24. Transmission rod; 25. Follower bevel gear; 26. Rotating lead screw; 27. Movable sleeve; 28. Second transmission frame; 29. ​​Connecting frame;

[0021] 3. Connecting frame; 31. First pressing plate; 32. Lifting plate; 33. Transmission block; 34. Connecting rod; 35. Pushing block; 36. Insertion rod; 37. Limiting slot; 38. Return spring;

[0022] 4. Hollow tube; 41. Second extrusion plate; 42. Limiting rod; 43. Guide frame; 44. Guide groove; 45. Push spring;

[0023] 5. Movable groove; 51. Limiting slide groove. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Example 1: A dustproof and waterproof junction box assembly for a permanent magnet synchronous motor, see [link / reference] Figures 1 to 4 The top of the synchronous motor housing 1 is detachably mounted with a mounting frame 11 by bolts. The top and bottom ends of the mounting frame 11 are open, and the two ends of the side of the mounting frame 11 are provided with corresponding wire passage grooves. The inside of the wire passage grooves is screwed with cable sealing sleeves, which are made of weather-resistant materials such as rubber, plastic or metal. The inside is equipped with an elastic sealing ring. When the cable passes through, the sealing ring is squeezed to make it fit tightly against the surface of the cable and the inner wall of the sleeve, which can effectively prevent water, dust, oil and other impurities from entering the junction box, thereby achieving waterproof and dustproof treatment inside the mounting frame 11. Multiple sets of terminals 14 are installed at equal intervals on the bottom inner side of the mounting frame 11. The top of the mounting frame 11 is detachably mounted with a sealing cover plate 12. The bottom of the sealing cover plate 12 is fixedly mounted with a sealing baffle 13, and the sealing baffle 13 is slidably sleeved on the outer wall of the top of the mounting frame 11.

[0026] After the cable passing through the inside of the synchronous motor housing 1 is inserted into the bottom of the mounting frame 11, the external cable is then inserted into the mounting frame 11 through the cable sealing sleeve inserted into the outer wall of the mounting frame 11. The cable is then bent so that it is placed along the inner wall of the mounting frame 11, and the corresponding ends are connected through the terminal 14 to facilitate the operation control of the synchronous motor.

[0027] For details, see Figures 1 to 4 The top of the rotating rod 22 is fixedly installed with a first transmission frame 15. The middle side of the first transmission frame 15 is vertically screwed with a locking bolt 16 by a thread, and the bottom of the locking bolt 16 is movably attached to the top surface of the sealing cover plate 12.

[0028] After placing and connecting the cables, align the plug rod 36 at the bottom of the sealing cover plate 12 with the guide groove 44 inside the guide frame 43. Then, press down the sealing cover plate 12 so that its bottom surface is attached to the top of the mounting frame 11. At the same time, the sealing baffle 13 is sleeved on the outer wall of the mounting frame 11. Then, tighten the abutment bolt 16 so that its bottom surface is removed from the surface of the sealing cover plate 12. Then, tighten the rotating rod 22 to adjust the position of the fitting arc plate 17 and the plug rod 36. Then, while the fitting arc plate 17 moves horizontally towards each other to abut and limit the movement of the cable outer wall, the limiting plug rod 42 moves and inserts into the limiting slot 37 inside the plug rod 36. Then, tighten the abutment bolt 16 in the opposite direction so that its bottom end is attached to the top of the sealing cover plate 12. Then, the rotating rod 22 is rotated and limited, thereby fixing the position of the fitting arc plate 17 and the plug rod 36.

[0029] Further, see Figures 1 to 4 A transmission frame 2 is fixedly installed at the bottom center of the sealing cover plate 12. A fixing frame 21 is fixedly installed on the outer wall of the transmission frame 2, and there are four sets of fixing frames 21. A fitting arc plate 17 is movably installed on the bottom outer side of the transmission frame 2. A rotating rod 22 is vertically rotatably installed inside the middle of the sealing cover plate 12 via a sealing bearing, and the rotating rod 22 extends from the top of the transmission frame 2 into its interior. A transmission bevel gear 23 is fixedly sleeved on the outer side of each rotating rod 22 away from the sealing cover plate 12. Transmission rods 24 are horizontally rotatably installed at the middle of the four outer sides of the transmission frame 2 via bearings. A follower bevel gear 25 is fixedly sleeved on the top of the side of each transmission rod 24, and the transmission bevel gear 23 and the follower bevel gear 25 mesh with each other. All 25 are rotatably mounted inside the transmission frame 2. The transmission bevel gear 23 is located below the outer side of the follower bevel gear 25. Each fixed frame 21 has a rotating screw 26 installed laterally through a bearing. The top side of the rotating screw 26 is fixedly connected to the top side of the transmission rod 24. Each rotating screw 26 has a movable sleeve 27 threadedly connected to its outer side. Each movable sleeve 27 has a second transmission frame 28 fixedly installed at its bottom outer side. Each second transmission frame 28 has a connecting frame 29 fixedly installed vertically at its bottom. The top side of the connecting frame 29 is fixedly connected to the outer side wall of the fitting arc plate 17. The bottom of the fixed frame 21 has a limiting groove 51 opened laterally. The top of the connecting frame 29 is slidably installed inside the limiting groove 51.

[0030] When the position of the fitting arc plate 17 needs to be adjusted, the rotating rod 22 is turned, causing the transmission bevel gear 23 to rotate inside the transmission frame 2. Simultaneously, the meshing transmission action of the transmission bevel gear 23 and the follower bevel gear 25 drives the four sets of follower bevel gears 25 to rotate synchronously inside the transmission frame 2. This, in turn, drives the transmission rod 24 connected to the follower bevel gear 25 to rotate synchronously on all four sides of the transmission frame 2. Furthermore, under the connecting transmission action of the transmission rod 24, the rotating screw 26 located inside the four sets of fixed frames 21 can rotate synchronously. Combined with the rotational transmission action of the rotating screw 26 on the transmission sleeve... Under the guidance and limiting effect of the limiting slide groove 51 on the top of the second transmission frame 28, the movable sleeves 27 located on the four sides of the bottom of the sealing cover plate 12 can only move horizontally in sync with the rotation of the screw 26. Then, under the connecting transmission action of the connecting frame 29, the four sets of fitting arc plates 17 are driven to move synchronously towards the inner wall of the mounting frame 11. This allows the outer wall of the fitting arc plate 17 to fit tightly against the outer wall of the cable that is bent along the inner wall of the mounting frame 11. This provides resistance from multiple directions on the outer wall of the cable, improving the stability of the cable placed inside the mounting frame 11.

[0031] It is worth noting that, see Figures 1 to 4 Each fixed frame 21 has a connecting frame 3 fixedly installed on the bottom side away from the transmission frame 2. A first pressing plate 31 is slidably installed on the top inner side of the connecting frame 3. A return spring 38 is movably installed inside the connecting frame 3, and the two ends of the return spring 38 are respectively movably attached to the outer wall of the first pressing plate 31 and the inner wall of the connecting frame 3. A transmission block 33 is fixedly installed on the top surface of the first pressing plate 31, and the transmission block 33 is movably installed inside the fixed frame 21 on the side away from the transmission frame 2. A movable groove 5 is opened on the bottom side of the transmission frame 2 away from the transmission frame 2, and the position of the movable groove 5 is... Below the transmission block 33, the inner diameter of the movable groove 5 is greater than the length of the transmission block 33. Connecting rods 34 are horizontally fixedly installed at both ends of the side of the movable sleeve 27. Pushing blocks 35 are fixedly installed between the top ends of the sides of the two sets of connecting rods 34. The vertical cross sections of the pushing blocks 35 and the transmission block 33 are both right-angled triangles. Lifting plates 32 are slidably installed between the outer sides of each pair of adjacent connecting frames 3. A plug-in rod 36 is vertically fixedly installed at the bottom middle of each lifting plate 32. The bottom end of the plug-in rod 36 is semi-circular. A limit slot 37 is opened on the bottom side of each plug-in rod 36.

[0032] As the rotating screw 26 is driven to move the movable sleeve 27 horizontally, the connecting rod 34 simultaneously drives the push block 35 to move horizontally inside the fixed frame 21 until the inclined surface of the push block 35 moves and fits against the inclined surface of the transmission block 33. With the continuous horizontal movement of the movable sleeve 27 and the push block 35, a downward pushing force is provided to the transmission block 33, allowing the transmission block 33 to pass through the movable groove 5 and move from inside the fixed frame 21 toward the inside of the connecting frame 3. At the same time, when the first pressing plate 31 moves downward synchronously inside the connecting frame 3, the lifting plate 32 drives the insertion rod 36 to move vertically downward inside the guide frame 43.

[0033] Guide frames 43 are vertically fixedly installed on the four corner surfaces of the inner side of the mounting frame 11. Each guide frame 43 has a vertically opened guide groove 44 inside, and the inner diameter of the guide groove 44 is the same as the diameter of the plug rod 36. Hollow tubes 4 are horizontally fixedly installed on the four outer side walls of the mounting frame 11. A second extrusion plate 41 is movably installed inside each hollow tube 4. A push spring 45 is movably installed inside each hollow tube 4, and the two ends of the push spring 45 are movably abutting against the outer wall of the second extrusion plate 41 and the inner wall of the hollow tube 4, respectively. A limit plug 42 is horizontally fixedly installed at the middle of the side of each second extrusion plate 41, and the limit plug 42 is slidably inserted into the guide frame 43. The top of the side of the limit plug 42 is semi-circular.

[0034] As the insertion rod 36 is driven to move downward in the guide groove 44 inside the guide frame 43, until the semi-circular bottom arc surface of the insertion rod 36 contacts the semi-circular side arc surface of the limiting insertion rod 42, the continuous downward movement of the insertion rod 36 provides a corresponding horizontal moving force to the limiting insertion rod 42. This, in turn, causes the second extrusion plate 41 to move horizontally inside the hollow tube 4, compressing the push spring 45 and giving it a restoring pushing force. After the insertion rod 36 moves downward to the limiting insertion rod on its side... After the slot 37 and the limiting rod 42 are at the same horizontal position, the outer wall of the plug rod 36 loses its resistance to the limiting rod 42. Under the restoring force of the push spring 45, the limiting rod 42 can be moved back and inserted into the limiting slot 37. This allows the limiting rod 42 to engage with the plug rod 36, thus fixing the position of the limiting rod 42 and the sealing cover 12. This achieves a complete sealing, waterproofing, and dustproofing of the interior of the mounting frame 11 from the top.

[0035] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

[0036] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A dust and water proof terminal box assembly for a permanent magnet synchronous motor comprising a synchronous motor housing (1), characterized in that, The synchronous motor housing (1) is detachably mounted with a mounting frame (11) on the top by bolts. Multiple sets of wiring terminals (14) are equidistantly mounted on the bottom inner side of the mounting frame (11). A sealing cover plate (12) is detachably mounted on the top of the mounting frame (11). A sealing baffle (13) is fixedly mounted on the bottom of the sealing cover plate (12), and the sealing baffle (13) is slidably sleeved on the outer wall of the top of the mounting frame (11). A transmission frame (2) is fixedly installed at the bottom center of the sealing cover plate (12). A fixing frame (21) is fixedly installed on the outer side wall of the transmission frame (2). A synchronization mechanism is provided inside the transmission frame (2). An adjustment mechanism is provided inside the fixing frame (21). The adjustment mechanism and the synchronization mechanism are connected in a transmission manner. A fitting arc plate (17) is movably installed on the bottom outer side of the transmission frame (2). The adjustment mechanism and the fitting arc plate (17) are connected in a transmission manner.

2. The dust and water proof junction box assembly of the permanent magnet synchronous motor according to claim 1, characterized in that, The synchronization mechanism includes a transmission bevel gear (23) and a follower bevel gear (25). A rotating rod (22) is vertically mounted inside the middle of the sealing cover plate (12) via a sealing bearing. The transmission bevel gear (23) is fixedly sleeved on the outer side of each rotating rod (22) away from the sealing cover plate (12). A transmission rod (24) is horizontally mounted on the middle of the four outer sides of the transmission frame (2) via a bearing. The follower bevel gear (25) is fixedly sleeved on the top side of each transmission rod (24), and the transmission bevel gear (23) and the follower bevel gear (25) mesh with each other.

3. The dust and water proof junction box assembly of the permanent magnet synchronous motor according to claim 2, characterized in that, The adjustment mechanism includes a rotating screw (26). Each fixed frame (21) has a rotating screw (26) installed laterally via a bearing. The top side of the rotating screw (26) is fixedly connected to the top side of the transmission rod (24). Each rotating screw (26) has a movable sleeve (27) threadedly connected to its outer side. Each movable sleeve (27) has a second transmission frame (28) fixedly installed at its bottom. Each second transmission frame (28) has a connecting frame (29) fixedly installed vertically at its bottom. The top side of the connecting frame (29) is fixedly connected to the outer wall of the fitting arc plate (17). The bottom of the fixed frame (21) has a limiting groove (51) opened laterally. The top of the connecting frame (29) is slidably installed inside the limiting groove (51).

4. The dustproof and waterproof junction box assembly for a permanent magnet synchronous motor as described in claim 2, characterized in that, The rotating rod (22) is fixedly mounted with a first transmission frame (15). The middle side of the first transmission frame (15) is vertically screwed with a tightening bolt (16) by a thread, and the bottom of the tightening bolt (16) is movably attached to the top surface of the sealing cover plate (12).

5. The dustproof and waterproof junction box assembly for a permanent magnet synchronous motor as described in claim 3, characterized in that, A connecting frame (3) is fixedly installed on the bottom side of each fixed frame (21) away from the transmission frame (2). A first extrusion plate (31) is slidably installed on the top inner side of the connecting frame (3). A reset spring (38) is movably arranged inside the connecting frame (3). A transmission block (33) is fixedly installed on the top surface of the first extrusion plate (31). The transmission block (33) is movably installed on the inside of the fixed frame (21) away from the transmission frame (2). A movable groove (5) is opened on the bottom side of the transmission frame (2) away from the transmission frame (2). A connecting rod (34) is horizontally fixedly installed on both ends of the side of the movable sleeve (27). A push block (35) is fixedly installed between the top ends of the sides of the two sets of connecting rods (34). A lifting plate (32) is slidably installed between the outer sides of each two adjacent sets of connecting frames (3). A plug-in rod (36) is vertically fixedly installed at the middle bottom of each lifting plate (32). A limit slot (37) is opened on the bottom side of each plug-in rod (36).

6. The dustproof and waterproof junction box assembly for a permanent magnet synchronous motor as described in claim 5, characterized in that, The four corner surfaces of the inner side of the mounting frame (11) are each vertically fixed with a guide frame (43). Each guide frame (43) has a vertically opened guide groove (44) inside, and the inner diameter of the guide groove (44) is the same as the diameter of the plug rod (36). The four outer side walls of the mounting frame (11) are each horizontally fixed with a hollow tube (4). Each hollow tube (4) has a second extrusion plate (41) movably installed inside, and each hollow tube (4) has a push spring (45) movably installed inside. Each second extrusion plate (41) has a limit plug rod (42) horizontally fixedly installed at the middle of its side, and the limit plug rod (42) is slidably inserted into the guide frame (43).

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