A low-speed permanent magnet direct-drive motor

Abstract

The invention discloses a low-speed permanent magnet direct-drive motor, which relates to the technical field of motors and comprises a motor body, wherein a wiring connector and a protective shell are fixedly mounted on the top of the motor body, a groove is arranged on the top of the wiring connector, a wiring port is arranged inside the groove, a maintenance port is arranged between the inner and outer walls of the protective shell, a maintenance plate is rotatably mounted inside the maintenance port, and a limiting device is arranged on the surface of the wiring connector; wherein the limiting device comprises a fixed frame, a sliding rod, a T-shaped plate, a clamping plate, an inclined block, a sliding plate, an L-shaped rod and a bending plate, wherein the fixed frame is fixedly mounted on the top of the wiring connector, the sliding rod slides through the fixed frame, the T-shaped plate is slidably mounted on the bottom of the fixed frame, the clamping plate is slidably mounted on the bottom of the T-shaped plate, and the inclined block is fixedly mounted on the outer wall of the clamping plate, so as to prevent other personnel from arbitrarily operating the wires on the motor body and improve the safety of the motor body during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a low-speed permanent magnet direct-drive motor. Background Art

[0002] Permanent magnet direct drive motor is a motor technology that uses the magnetic field generated by permanent magnets to directly drive the load to achieve the work of the motor.

[0003] The patent with patent announcement number CN220291776U involves a low-speed, high-torque permanent magnet direct-drive motor, and involves the field of permanent magnet direct-drive motor equipment, including a motor body and a casing. A locking mechanism is provided on both sides of the inside of the casing, and one side of the locking mechanism is fixedly connected to one side of the inside of the casing, and the side of the locking mechanism away from the casing is fixedly connected to one side of the inside of the motor body. The casing is pressed to drive the connecting component in the movable groove to move, so that the connecting component leaves the movable groove of the support block under the limit of the blocking component, and the motor body is released from the casing. When installing, the casing is aligned with the motor body and inserted, and the connecting component enters the movable groove and enters the V-block under the limit of the blocking component to complete the locking of the motor body to the casing. This structure simplifies the disassembly process of the casing and improves the maintenance efficiency to a certain extent.

[0004] In the above patent, the disassembly process of the casing is simplified, and the maintenance efficiency is improved to a certain extent. Since the motor needs to be connected to the power cord when in use, it is difficult to protect the power cord connected to the motor after the power cord of the motor is connected, resulting in the power cord on the motor being easily detached from the motor when being pulled, thereby affecting the normal operation of the motor. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a low-speed permanent magnet direct-drive motor, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-speed permanent magnet direct-drive motor, comprising a motor body, a wiring connector and a protective shell are fixedly installed on the top of the motor body, a groove is provided on the top of the wiring connector, a wiring port is installed inside the groove, a maintenance port is provided between the inner and outer walls of the protective shell, a maintenance plate is rotatably installed inside the maintenance port, and a limiting device is provided on the surface of the wiring connector;

[0007] Among them, the limiting device includes a fixed frame, a sliding rod, a T-shaped plate, a clamping plate, an inclined block, a slide plate, an L-shaped rod and a bent plate, the fixed frame is fixedly installed on the top of the connector, the sliding rod slides through the fixed frame, the T-shaped plate is slidably installed on the bottom of the fixed frame, the clamping plate is slidably installed on the bottom of the T-shaped plate, the inclined block is fixedly installed on the outer wall of the clamping plate, the slide plate slides through the T-shaped plate, the L-shaped rod is fixedly installed on the bottom of the sliding rod, a sliding groove is provided on the top of the fixed frame, the bent plate is slidably installed inside the sliding groove, a card groove is provided on the top of the circumferential surface of the sliding rod, and the side of the L-shaped rod close to the slide plate is set to an arc shape. Clamping the wire by the clamping plate can prevent the wire from being detached from the connector when the wire is pulled.

[0008] According to the above technical solution, a No. 1 spring sheet is arranged between the T-shaped plate and the connector, and the No. 1 spring sheet can play a buffering and protective effect on the wire and the clamping plate when they are pulled. An elastic telescopic rod is arranged between the bending plate and the sliding rod, and an elastic plate is rotatably installed inside the groove. The elastic plate can support the wire and keep the wire in a bent state in the connector. At the same time, the elastic plate can also play a buffering effect on the wire when the wire is pulled.

[0009] According to the above technical solution, one end of the elastic telescopic rod is fixed to the bending plate, and the other end of the elastic telescopic rod is slidably connected to the sliding rod. The elastic force of the elastic telescopic rod drives the bending plate to move downward, the L-shaped rod contacts the sliding plate, and the bottom of the sliding plate contacts the inclined block.

[0010] According to the above technical solution, a sealing device for sealing the protective shell and the wire is arranged inside the protective shell, and a protective device is arranged on the surface of the sealing device. The sealing device includes a hydraulic cylinder, a piston plate, a fixed block, a triangular block, an annular plate and a hollow rubber. The hydraulic cylinder is fixedly installed inside the protective shell, the piston plate is slidably installed inside the hydraulic cylinder, the fixed block is fixedly installed on the right side of the piston plate, the triangular block is fixedly installed on the circumferential surface of the slide rod, the annular plate is fixedly installed inside the protective shell, and the hollow rubber is fixedly installed inside the annular plate. The hollow rubber is connected with the inside of the hydraulic cylinder through a pipeline, and silicone oil is arranged inside the hydraulic cylinder. The hollow rubber can expand to fill the gap between the protective shell and the wire, thereby improving the sealing effect inside the protective shell and preventing outside air from entering the inside of the protective shell through the gap between the wire and the protective shell. The outside humid air entering the inside of the protective shell will corrode the inside of the protective shell.

[0011] According to the above technical scheme, the sealing device also includes a sealing cylinder, a push rod, a cross bar, an arc plate, a movable plate, and a guide frame. The sealing cylinder is fixedly installed on the circumferential surface of the annular plate, the push rod is slidably installed inside the sealing cylinder, the cross bar slides through the left side of the protective shell, the arc plate is fixedly installed on the left side of the outer wall of the protective shell, the movable plate slides through the arc plate, and the guide frame is fixedly connected to the movable plate through an elastic telescopic block. The guide frame will protect the edge of the wire to prevent the wire from being damaged due to excessive bending angle caused by bending and pulling the wire.

[0012] According to the above technical solution, a piston is arranged between the push rod and the sealing cylinder, and the sealing between the push rod and the sealing cylinder can be improved by the piston. A slope is arranged on the top of the push rod, and the end of the cross bar close to the movable plate is arranged as a slope. The cross bar contacts the movable plate, so that the push rod can push the cross bar to move when it moves. An elastic part is arranged between the piston plate and the hydraulic cylinder, and the piston plate can be driven to reset by the elastic part.

[0013] According to the above technical solution, the protective device includes a hollow plate, an inclined plate, a fixed rod, a concave block and a contact plate. The hollow plate is slidably installed inside the arc plate. A No. 2 spring plate is arranged between the hollow plate and the protective shell. The inclined plate is rotatably installed on the top of the guide frame. A No. 3 spring plate is arranged between the inclined plate and the guide frame. The fixed rod is fixedly installed on the right bottom of the hollow plate. The concave block is fixedly installed on the right side of the fixed rod. The contact plate slides through the bottom of the groove. A notch is provided on the top of the concave block. When the elastic plate rotates downward, the support for the wire will be loosened, and the wire inside the protective shell can move a certain distance to the outside of the protective shell, loosening the wire to prevent the wire from being further pulled strongly.

[0014] According to the above technical solution, a horizontal plate is slidably installed on the left side of the connector, a bending block is fixedly installed on the bottom of the horizontal plate, a contact block is fixedly installed on the circumferential surface of the fixed rod, a limiting block is slidably penetrated between the upper and lower sides of the horizontal plate, and a No. 4 spring sheet is arranged between the limiting block and the horizontal plate. The limiting block will limit the clamping plate and the T-shaped plate to prevent the T-shaped plate and the clamping plate from resetting and pulling the wire.

[0015] The present invention provides a low-speed permanent magnet direct-drive motor. It has the following beneficial effects:

[0016] (1) In this invention, after the wire is inserted into the protective shell and the connector, when the slide bar is pushed to move, the L-shaped rod will push the slide plate downward, so that the clamping plate will clamp the wire. The clamping plate can prevent the wire from being detached from the connector when the wire is pulled, thereby improving the connection effect between the wire and the connector. At the same time, when the maintenance plate closes the protective shell, it will limit the slide bar. Only when the maintenance plate is opened can the slide bar and the clamping plate be adjusted, thereby preventing other people from arbitrarily operating the wire on the motor body, thereby improving the safety of the motor body during operation.

[0017] (2) In the invention, when the sliding rod moves, it drives the triangular block to move. The inclined surface of the triangular block squeezes the piston plate to move toward the inside of the hydraulic cylinder. The liquid inside the hydraulic cylinder enters the inside of the hollow rubber through the pipeline. The increase of liquid inside the hollow rubber will cause expansion. The expansion of the hollow rubber can fill the gap between the protective shell and the wire, thereby improving the sealing effect inside the protective shell and preventing the outside air from entering the inside of the protective shell through the gap between the wire and the protective shell. The outside humid air entering the inside of the protective shell will corrode the inside of the protective shell, thereby affecting the service life of the motor body. Excessive liquid inside the hollow rubber will enter the inside of the sealing cylinder, causing the cross bar to push the moving plate and the wire frame to move toward the inside of the arc plate. The guide frame will protect the edge of the wire and prevent the wire from being damaged by the bending angle caused by pulling the wire.

[0018] (3) In this invention, when the wire is excessively bent and pulled, the wire will push the guide frame to move in the direction of the movable plate, the inclined plate will push the hollow plate and the fixed rod to move, and the fixed rod will drive the concave block to move when it moves. The concave block will release the limit on the contact plate and the elastic plate. When the elastic plate rotates downward, it will loosen the support for the wire. The wire inside the protective shell can move a certain distance to the outside of the protective shell, loosening the wire to prevent the wire from being further pulled strongly. At the same time, the limiting block will limit the clamping plate and the T-shaped plate to prevent the T-shaped plate and the clamping plate from resetting and pulling the wire. When the wire is tilted and pulled, it can provide a certain degree of protection for the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the position structure of the protective shell and the arc plate of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the protective shell of the present invention;

[0022] Figure 4 This is a schematic diagram of the position structure of the protective shell and the annular plate of the present invention;

[0023] Figure 5 It is a schematic diagram of the position structure of the connector and the concave block of the present invention;

[0024] Figure 6 This is a schematic diagram of the position structure of the horizontal plate and the limiting block of the present invention;

[0025] Figure 7 It is a schematic diagram of the position structure of the movable plate and the guide frame of the present invention;

[0026] Figure 8 This is a schematic diagram of the position structure of the clamping plate and the ramp block of the present invention;

[0027] Fig. 9 It is a schematic diagram of the position structure of the T-shaped plate and the slide plate of the present invention.

[0028] In the figure: 1, motor body; 2, connector; 3, protective shell; 4, maintenance plate; 5, fixed frame; 6, slide bar; 7, T-shaped plate; 8, clamping plate; 81, inclined block; 9, slide plate; 10, L-shaped rod; 11, bending plate; 121, hydraulic cylinder; 122, piston plate; 123, fixed block; 124, triangular block; 125, annular plate; 126, hollow rubber; 127, sealing cylinder; 128, push rod; 129, cross bar; 1210, arc plate; 1211, moving plate; 1212, guide frame; 131, hollow plate; 132, inclined plate; 133, fixed rod; 134, concave block; 135, contact plate; 136, contact block; 137, cross plate; 138, bending block; 139, limiting block; 14, elastic plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 9 One embodiment of the present invention is: a low-speed permanent magnet direct-drive motor, comprising a motor body 1, a wiring connector 2 and a protective shell 3 are fixedly installed on the top of the motor body 1, a groove is provided on the top of the wiring connector 2, a wiring port is installed inside the groove, a maintenance port is provided between the inner and outer walls of the protective shell 3, a maintenance plate 4 is rotatably installed inside the maintenance port, and a limiting device is provided on the surface of the wiring connector 2;

[0031] Among them, the limiting device includes a fixed frame 5, a sliding bar 6, a T-shaped plate 7, a clamping plate 8, an inclined block 81, a slide plate 9, an L-shaped rod 10 and a bending plate 11. The fixed frame 5 is fixedly installed on the top of the connector 2, the sliding bar 6 slides through the fixed frame 5, the T-shaped plate 7 is slidably installed at the bottom of the fixed frame 5, the clamping plate 8 is slidably installed at the bottom of the T-shaped plate 7, the inclined block 81 is fixedly installed on the outer wall of the clamping plate 8, the slide plate 9 slides through the T-shaped plate 7, the L-shaped rod 10 is fixedly installed at the bottom of the sliding bar 6, a sliding groove is provided on the top of the fixed frame 5, the bending plate 11 is slidably installed inside the sliding groove, a card groove is provided on the top of the circumferential surface of the sliding bar 6, and the side of the L-shaped rod 10 close to the slide plate 9 is set to an arc shape. Clamping the wire by the clamping plate 8 can prevent the wire from being detached from the connector 2 when the wire is pulled.

[0032] A No. 1 spring sheet is arranged between the T-shaped plate 7 and the connector 2, and the No. 1 spring sheet can provide buffering protection for the wire and the clamping plate 8 when they are pulled. An elastic telescopic rod is arranged between the bending plate 11 and the slide rod 6, and an elastic plate 14 is rotatably installed inside the groove. The elastic plate 14 can support the wire and keep the wire in a bent state in the connector 2. At the same time, the elastic plate 14 can also provide buffering effect for the wire when the wire is pulled.

[0033] One end of the elastic telescopic rod is fixed to the bending plate 11, and the other end of the elastic telescopic rod is slidably connected to the sliding rod 6. The elastic force of the elastic telescopic rod drives the bending plate 11 to move downward, the L-shaped rod 10 contacts the slide plate 9, and the bottom of the slide plate 9 contacts the inclined block 81.

[0034] When this embodiment is working: the wire is inserted into the interior of the protective shell 3 and connected to the interior of the wiring port. After the wire connection is completed, the maintenance plate 4 is pushed upward to rotate to close the protective shell 3. When the maintenance plate 4 is rotated upward, it will contact the sliding bar 6, so that when the maintenance plate 4 is rotated upward, it will push the sliding bar 6 to move toward the inside of the protective shell 3. When the sliding bar 6 moves, it will drive the L-shaped rod 10 to move. When the L-shaped rod 10 moves, it will contact the slide plate 9 and the L-shaped rod 10 will push the slide plate 9 to move downward. When the slide plate 9 moves downward, it will contact the inclined surface of the inclined surface block 81, so that when the slide plate 9 moves downward, it will push the inclined surface block 81 and the clamping plate 8 to move in the direction of the wire, so that the clamping plate 8 will clamp the wire. When the sliding bar 6 moves, it will drive the card slot to move. When the card slot moves to the bottom of the curved plate 11, the elastic force of the elastic telescopic rod will drive the curved plate 11 to move downward and insert into the interior of the card slot to limit the sliding bar 6, so as to prevent the sliding bar 6 from always pressing against the maintenance plate 4.

[0035] See also Figure 1-Figure 9On the basis of the above embodiment, in another embodiment of the present invention, a sealing device for sealing between the protective shell 3 and the wire is arranged inside the protective shell 3, a protective device is arranged on the surface of the sealing device, and the sealing device includes a hydraulic cylinder 121, a piston plate 122, a fixed block 123, a triangular block 124, an annular plate 125 and a hollow rubber 126, the hydraulic cylinder 121 is fixedly installed inside the protective shell 3, the piston plate 122 is slidably installed inside the hydraulic cylinder 121, the fixed block 123 is fixedly installed on the right side of the piston plate 122, and the triangular block 124 is fixedly installed on the slide rod 6 The circumferential surface of the protective shell 3 is fixedly mounted on the annular plate 125, and the hollow rubber 126 is fixedly mounted on the annular plate 125. The hollow rubber 126 is connected to the interior of the hydraulic cylinder 121 through a pipeline. Silicone oil is arranged inside the hydraulic cylinder 121. The hollow rubber 126 expands to fill the gap between the protective shell 3 and the wire, thereby improving the sealing effect inside the protective shell 3 and preventing outside air from entering the inside of the protective shell 3 through the gap between the wire and the protective shell 3. The outside humid air entering the inside of the protective shell 3 will corrode the inside of the protective shell 3.

[0036] The sealing device also includes a sealing cylinder 127, a push rod 128, a cross bar 129, an arc plate 1210, a movable plate 1211, and a guide frame 1212. The sealing cylinder 127 is fixedly installed on the circumferential surface of the annular plate 125, the push rod 128 is slidably installed inside the sealing cylinder 127, the cross bar 129 slides through the left side of the protective shell 3, the arc plate 1210 is fixedly installed on the left side of the outer wall of the protective shell 3, the movable plate 1211 slides through the arc plate 1210, and the guide frame 1212 is fixedly connected to the movable plate 1211 through an elastic telescopic block. The guide frame 1212 will protect the edge of the wire to prevent the wire from being bent and pulled, resulting in the wire being bent at an excessively large angle and causing damage to the wire.

[0037] A piston is arranged between the push rod 128 and the sealing cylinder 127, and the piston can improve the sealing between the push rod 128 and the sealing cylinder 127. A slope is arranged on the top of the push rod 128, and the end of the cross bar 129 close to the movable plate 1211 is arranged as a slope. The cross bar 129 contacts the movable plate 1211, so that when the push rod 128 moves, the cross bar 129 can be pushed to move. An elastic part is arranged between the piston plate 122 and the hydraulic cylinder 121, and the piston plate 122 can be driven to reset by the elastic part.

[0038] The protective device includes a hollow plate 131, an inclined plate 132, a fixed rod 133, a concave block 134 and a contact plate 135. The hollow plate 131 is slidably installed inside the arc plate 1210. A No. 2 spring piece is arranged between the hollow plate 131 and the protective shell 3. The inclined plate 132 is rotatably installed on the top of the guide frame 1212. A No. 3 spring piece is arranged between the inclined plate 132 and the guide frame 1212. The fixed rod 133 is fixedly installed on the right bottom of the hollow plate 131. The concave block 134 is fixedly installed on the right side of the fixed rod 133. The contact plate 135 slides through the bottom of the groove. A notch is provided on the top of the concave block 134. When the elastic plate 14 rotates downward, the support for the wire will be loosened. The wire inside the protective shell 3 can move a certain distance to the outside of the protective shell 3, and the wire is loosened to prevent the wire from being further pulled.

[0039] A horizontal plate 137 is slidably installed on the left side of the connector 2, a bending block 138 is fixedly installed on the bottom of the horizontal plate 137, a contact block 136 is fixedly installed on the circumferential surface of the fixing rod 133, a limiting block 139 is slidably penetrated between the upper and lower sides of the horizontal plate 137, and a No. 4 spring piece is arranged between the limiting block 139 and the horizontal plate 137. The limiting block 139 will limit the clamping plate 8 and the T-shaped plate 7 to prevent the T-shaped plate 7 and the clamping plate 8 from resetting and pulling the wire.

[0040] When the present embodiment is working, the sliding rod 6 moves and the triangular block 124 moves. When the triangular block 124 moves, it contacts the fixed block 123, so that when the triangular block 124 moves, it pushes the fixed block 123 and the piston plate 122 to move toward the inside of the hydraulic cylinder 121. When the piston plate 122 moves, it squeezes the liquid inside the hydraulic cylinder 121 into the inside of the hollow rubber 126 through the pipeline. The increase of liquid inside the hollow rubber 126 will cause expansion. When the hollow rubber 126 expands, it will fill the gap between the wire and the protective shell 3. At the same time, the increase of liquid inside the hollow rubber 126 will enter Inside the sealing cylinder 127, the increase of liquid inside the sealing cylinder 127 will push the push rod 128 to move to the outside of the sealing cylinder 127. When the push rod 128 moves, the inclined surface of the push rod 128 will push the cross bar 129 to move to the outside of the protective shell 3. When the cross bar 129 moves, the left inclined surface of the cross bar 129 will contact the moving plate 1211, so that when the cross bar 129 moves, it will push the moving plate 1211 to move to the inside of the arc plate 1210. When the moving plate 1211 moves, it will drive the elastic telescopic block and the guide frame 1212 to move, and the guide frame 1212 will move and be in close contact with the wire;

[0041] When the wire is pulled from the side, the guide frame 1212 can prevent the wire from bending at a large angle. When the pulling force is too large, the wire will push the guide frame 1212 to move in the direction of the moving plate 1211. When the guide frame 1212 moves, it will drive the inclined plate 132 to move. When the inclined plate 132 moves, it will be blocked by the moving plate 1211. The moving plate 1211 will push the inclined plate 132 to rotate. When the inclined plate 132 rotates, it will push the hollow plate 131 to move to the right. When the hollow plate 131 moves to the right, it will drive the fixed rod 133 to move to the right. When the fixed rod 133 moves, it will drive the concave block 134 to move. When the concave block 134 moves, it will drive the notch to move. The notch moves to the contact plate When the fixing rod 133 moves, the contact block 136 is driven to move, and the contact block 136 contacts with the bottom inclined surface of the bending block 138 when the fixing rod 133 moves, so that the contact block 136 pushes the bending block 138 and the cross plate 137 to move upwards, and the cross plate 137 moves upwards, which drives the limiting block 139 to move upwards, and the limiting block 139 moves upwards to limit the T-shaped plate 7 from resetting to the right side.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-speed permanent magnet direct-drive motor, comprising a motor body (1), characterized in that: A wiring connector (2) and a protective shell (3) are fixedly mounted on the top of the motor body (1); a groove is provided on the top of the wiring connector (2); a wiring port is installed inside the groove; a maintenance port is provided between the inner walls of the protective shell (3); a maintenance plate (4) is rotatably mounted inside the maintenance port; and a limiting device is provided on the surface of the wiring connector (2); The limiting device comprises a fixed frame (5), a sliding rod (6), a T-shaped plate (7), a clamping plate (8), an inclined surface block (81), a sliding plate (9), an L-shaped rod (10) and a bent plate (11), wherein the fixed frame (5) is fixedly mounted on the top of the connector (2), the sliding rod (6) slides through the fixed frame (5), the T-shaped plate (7) slides through the bottom of the fixed frame (5), the clamping plate (8) slides through the bottom of the T-shaped plate (7), the inclined surface block (81) is fixedly mounted on the outer wall of the clamping plate (8), the sliding plate (9) slides through the T-shaped plate (7), the L-shaped rod (10) is fixedly mounted on the bottom of the sliding rod (6), a sliding groove is provided on the top of the fixed frame (5), the bent plate (11) slides inside the sliding groove, and a clamping groove is provided on the top of the circumferential surface of the sliding rod (6); Wherein, a sealing device for sealing between the protective shell (3) and the wire is arranged inside the protective shell (3), and a protective device is arranged on the surface of the sealing device; The sealing device comprises a hydraulic cylinder (121), a piston plate (122), a fixed block (123), a triangular block (124), an annular plate (125) and a hollow rubber (126); the hydraulic cylinder (121) is fixedly mounted inside the protective shell (3); the piston plate (122) is slidably mounted inside the hydraulic cylinder (121); the fixed block (123) is fixedly mounted on the right side of the piston plate (122); the triangular block (124) is fixedly mounted on the circumferential surface of the sliding rod (6); the annular plate (125) is fixedly mounted inside the protective shell (3); the hollow rubber (126) is fixedly mounted inside the annular plate (125); the hollow rubber (126) is connected to the inside of the hydraulic cylinder (121) through a pipeline; and silicone oil is provided inside the hydraulic cylinder (121); The sealing device further comprises a sealing cylinder (127), a push rod (128), a cross rod (129), an arc plate (1210), a movable plate (1211), and a guide frame (1212); the sealing cylinder (127) is fixedly mounted on the circumferential surface of the annular plate (125); the push rod (128) is slidably mounted inside the sealing cylinder (127); the cross rod (129) slides through the left side of the protective shell (3); the arc plate (1210) is fixedly mounted on the left side of the outer wall of the protective shell (3); the movable plate (1211) slides through the arc plate (1210); and the guide frame (1212) is fixedly connected to the movable plate (1211) via an elastic telescopic block; The protective device comprises a hollow plate (131), an inclined plate (132), a fixed rod (133), a concave block (134) and a contact plate (135); the hollow plate (131) is slidably mounted inside the arc plate (1210); a second spring piece is provided between the hollow plate (131) and the protective shell (3); the inclined plate (132) is rotatably mounted on the top of the guide frame (1212); a third spring piece is provided between the inclined plate (132) and the guide frame (1212); the fixed rod (133) is fixedly mounted on the right bottom of the hollow plate (131); the concave block (134) is fixedly mounted on the right side of the fixed rod (133); the contact plate (135) slides through the bottom of the groove; and a notch is provided on the top of the concave block (134).

2. A low-speed permanent magnet direct-drive motor according to claim 1, characterized in that: A first spring sheet is provided between the T-shaped plate (7) and the connector (2), an elastic telescopic rod is provided between the bending plate (11) and the slide rod (6), and an elastic plate (14) is rotatably mounted inside the groove.

3. A low-speed permanent magnet direct-drive motor according to claim 2, characterized in that: One end of the elastic telescopic rod is fixed to the curved plate (11), the other end of the elastic telescopic rod is slidably connected to the sliding rod (6), the L-shaped rod (10) is in contact with the sliding plate (9), and the bottom of the sliding plate (9) is in contact with the inclined surface block (81).

4. The low-speed permanent magnet direct-drive motor according to claim 1, characterized in that: A piston is provided between the push rod (128) and the sealing cylinder (127); a slope is provided on the top of the push rod (128); an end of the cross rod (129) close to the moving plate (1211) is provided with a slope; and the cross rod (129) is in contact with the moving plate (1211).

5. The low-speed permanent magnet direct-drive motor according to claim 1, characterized in that: A horizontal plate (137) is slidably mounted on the left side of the connector (2), a bending block (138) is fixedly mounted on the bottom of the horizontal plate (137), a contact block (136) is fixedly mounted on the circumferential surface of the fixing rod (133), a limiting block (139) is slidably penetrated between the upper and lower sides of the horizontal plate (137), and a No. 4 spring piece is arranged between the limiting block (139) and the horizontal plate (137).

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