Motor anti-reversion device

Abstract

The utility model relates to the technical field of motors, and provides a motor anti-reversion device, which comprises an end cover and a rotor shaft which are arranged on a motor, the end cover is sleeved on the rotor shaft and is rotatably connected with the rotor shaft, one end of the rotor shaft extends to the outer side of the end cover and is provided with an anti-reversion disc, the end cover is provided with an anti-reversion chassis which is arranged corresponding to the anti-reversion disc, and the anti-reversion chassis is connected with the rotor shaft. An anti-reversion assembly is arranged between the anti-reversion disc and the anti-reversion chassis; the anti-reverse assembly comprises a plurality of anti-reverse pins, the anti-reverse pins are movably installed on the anti-reverse disc, a plurality of anti-reverse grooves are formed in the upper circumference of the anti-reverse disc, and the anti-reverse pins and the anti-reverse grooves are correspondingly arranged and connected in an inserted mode. The anti-reversion device is convenient to install, good in anti-reversion effect and convenient to assemble, debug and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor anti-reversal device. Background Art

[0002] In some motor application fields, bidirectional rotation of the motor is not allowed. Once the running direction of the motor is determined, it cannot be reversed, especially during the use of vertical water pumps. Therefore, a special structure needs to be designed to avoid the occurrence of motor reversal.

[0003] At present, there are many devices for preventing motor reversal. For example, patent number CN201320814699.6, patent name is motor with anti-reversal property, the device includes motor front end cover, backstop outer ring, skeleton oil seal, motor main shaft, key, motor bearing and backstop inner ring, motor bearing and wedge-type backstop are arranged between the front end cover of the motor and the motor main shaft, the backstop inner ring of the wedge-type backstop is connected to the motor main shaft through a key, and a skeleton oil seal is arranged between the backstop outer ring and the motor main shaft. The above device prevents the motor main shaft from reversing by the backstop outer ring and the backstop inner ring. Since the backstop outer ring and the backstop inner ring are both arranged in the skeleton oil seal, installation and maintenance are inconvenient. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a motor anti-reversal device, which is easy to install, has good anti-reversal effect, and is convenient to assemble, debug and maintain.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A motor anti-reversal device comprises an end cover and a rotor shaft provided on the motor, wherein the end cover is sleeved on the rotor shaft and is rotatably connected to the rotor shaft, one end of the rotor shaft extends to the outside of the end cover and is provided with an anti-reversal disk, an anti-reversal chassis provided corresponding to the anti-reversal disk is provided on the end cover, and an anti-reversal component is provided between the anti-reversal disk and the anti-reversal chassis;

[0007] The anti-reverse assembly includes a plurality of anti-reverse pins, which are movably mounted on the anti-reverse disk. A plurality of anti-reverse grooves are arranged around the anti-reverse chassis, and the anti-reverse pins are arranged corresponding to the anti-reverse grooves and are plug-connected.

[0008] As an improved technical solution, the anti-reverse disk is provided with a plurality of mounting holes corresponding to the anti-reverse grooves, the anti-reverse pin is movably installed in the mounting hole, and the end of the anti-reverse pin away from the anti-reverse chassis is compressed with a spring to assist the anti-reverse pin in resetting.

[0009] As an improved technical solution, the mounting hole is a through hole, the top of the through hole is threadedly connected with an adjusting screw plug, and one end of the spring away from the anti-reverse pin abuts against the adjusting screw plug;

[0010] Alternatively, the mounting hole is a countersunk hole, which is arranged on a side of the anti-reverse disk close to the anti-reverse chassis, and one end of the spring away from the anti-reverse pin abuts against an inner wall of the countersunk hole.

[0011] As an improved technical solution, the end of the anti-reverse pin away from the spring is provided with a rounded corner or a C-corner;

[0012] One end of the anti-reverse pin that contacts the spring is arranged at a sharp angle, and the sharp angle of the anti-reverse pin is inserted into the hollow space of the spring.

[0013] As an improved technical solution, each of the anti-reverse grooves is provided with an inclined surface along the forward rotation direction of the rotor shaft, and each of the anti-reverse grooves is provided with a vertical surface along the reverse rotation direction of the rotor shaft.

[0014] As an improved technical solution, a bearing is provided between the end cover and the rotor shaft, and the two ends of the bearing are respectively abutted against a bearing inner cover and a bearing outer cover, the bearing inner cover is connected to the end cover, and the bearing outer cover abuts against the anti-reverse disk.

[0015] As an improved technical solution, the anti-reverse disk is sleeved on the rotor shaft, the inner cavity of the anti-reverse disk is connected to a connecting piece, and the connecting piece is fixedly connected to the rotor shaft.

[0016] As an improved technical solution, a protrusion is provided at one end of the anti-reverse disk close to the anti-reverse chassis, the protrusion is sleeved between the anti-reverse chassis and the rotor shaft, and abuts against the bearing outer cover, and a cavity is provided at one end of the anti-reverse disk away from the anti-reverse chassis, the connecting piece is arranged in the cavity, and is fixedly connected to the inner wall of the cavity.

[0017] After adopting the above technical solution, the beneficial effects of the utility model are:

[0018] By providing an end cover and a rotor shaft, the end cover is sleeved on the rotor shaft and is rotatably connected to the rotor shaft, one end of the rotor shaft extends to the outside of the end cover and is installed with an anti-reverse disk, an anti-reverse chassis corresponding to the anti-reverse disk is installed on the end cover, an anti-reverse assembly is provided between the anti-reverse disk and the anti-reverse chassis, and the anti-reverse assembly is conveniently assembled and fixed by providing the anti-reverse disk and the anti-reverse chassis;

[0019] The anti-reverse assembly includes a plurality of anti-reverse pins, which are movably mounted on the anti-reverse disk. A plurality of anti-reverse grooves are arranged on the circumference of the anti-reverse chassis. The anti-reverse pins are arranged correspondingly to the anti-reverse grooves and are plug-connected. By arranging the anti-reverse pins on the anti-reverse disk and arranging the anti-reverse grooves on the circumference of the anti-reverse chassis, when the rotor shaft rotates normally, the anti-reverse pins are in sliding contact with the anti-reverse grooves. When the rotor shaft reverses, the anti-reverse pins are stuck in the anti-reverse grooves to prevent the rotor shaft from reversing. The anti-reverse effect is good, and the assembly, debugging and maintenance are convenient.

[0020] The anti-reverse disk is provided with a plurality of mounting holes corresponding to the anti-reverse grooves, the anti-reverse pin is movably installed in the mounting hole, and a spring is also arranged in the mounting hole, and a force is applied to the anti-reverse pin by the spring so that the anti-reverse pin can always contact with the anti-reverse groove;

[0021] The mounting hole is set as a through hole, and the top of the through hole is threadedly connected with an adjusting screw plug, and the spring is against the adjusting screw plug. By rotating the adjusting screw plug, the elastic force of the spring can be adjusted, thereby adjusting the force acting on the anti-reverse pin;

[0022] The end of the anti-reverse pin away from the spring is provided with a rounded corner or a C-angle. By setting one end of the anti-reverse pin to be a rounded corner or a C-angle, the anti-reverse pin is convenient to slide between the plurality of anti-reverse grooves of the anti-reverse chassis when the rotor shaft rotates. By designing the end of the anti-reverse pin that contacts the spring to be a sharp-angle structure, one end of the anti-reverse pin can extend into the hollow space of the spring, so that the force acting on the anti-reverse pin by the spring is more balanced.

[0023] Each anti-reverse groove is provided with an inclined surface along the forward rotation direction of the rotor shaft, and each anti-reverse groove is provided with a vertical surface along the reverse rotation direction of the rotor shaft. The inclined surface is provided so that the anti-reverse pin can slide between different anti-reverse grooves when the rotor shaft rotates forward, and the vertical surface is provided so that the anti-reverse pin can be blocked when the rotor shaft rotates reversely to prevent the rotor shaft from reversing.

[0024] A bearing is provided between the end cover and the rotor shaft, and the two ends of the bearing are respectively abutted against a bearing inner cover and a bearing outer cover, the bearing inner cover is connected to the end cover, and the bearing outer cover abuts against the anti-reverse disk. By providing the bearing, the bearing inner cover and the bearing outer cover, the end cover and the rotor shaft are conveniently connected in rotation;

[0025] The anti-reverse disk is sleeved on the rotor shaft, and the inner cavity of the anti-reverse disk is connected with a connecting piece, which is fixedly connected to the rotor shaft, so that the connection and fixation of the anti-reverse disk and the rotor shaft can be easily realized through the connecting piece;

[0026] A raised portion is provided at one end of the anti-reverse disk close to the anti-reverse chassis, the raised portion is sleeved between the anti-reverse chassis and the rotor shaft, and rests against the bearing outer cover, and a cavity is provided at one end of the anti-reverse disk away from the anti-reverse chassis, a connecting piece is provided in the cavity, and is fixedly connected to the inner wall of the cavity. The raised portion is provided to facilitate fixing the bearing, and the cavity is provided to facilitate fixed connection of the connecting piece to the rotor shaft.

[0027] In summary, the utility model provides a motor anti-reversal device, which is easy to install, has a good anti-reversal effect, and is easy to assemble, debug and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In addition, in the drawings, the components or parts are not necessarily drawn according to the actual scale.

[0029] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of another embodiment of the utility model;

[0031] Figure 3 This is a schematic structural diagram of an anti-reversal chassis according to an embodiment of the utility model;

[0032] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0033] Figure 5 This is a schematic structural diagram of the anti-reverse pin C angle of one embodiment of the utility model;

[0034] Figure 6 This is a schematic structural diagram of the rounded corners of the anti-reverse pin of another embodiment of the utility model;

[0035] Reference numerals:

[0036] 1. End cover, 2. Rotor shaft, 3. Anti-reverse disk, 301. Raised portion, 4. Anti-reverse chassis, 5. Anti-reverse assembly, 501. Anti-reverse pin, 502. Anti-reverse groove, 503. Mounting hole, 504. Spring, 505. Adjustment plug, 506. Inclined surface, 507. Vertical surface, 6. Bearing, 7. Bearing inner cover, 8. Bearing outer cover, 9. Connector. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0040] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0041] like Figure 1-Figure 4 As shown, a motor anti-reverse device comprises an end cover 1 and a rotor shaft 2 provided on the motor, the end cover 1 is sleeved on the rotor shaft 2 and is rotatably connected with the rotor shaft 2, the rotor shaft 2 serves as the output end of the motor, the end cover 1 is sleeved on the rotor shaft 2 and is fixedly mounted on the motor, one end of the rotor shaft 2 extends to the outside of the end cover 1, and is installed with an anti-reverse disk 3, the anti-reverse disk 3 is fixedly connected with the rotor shaft 2, and can rotate synchronously with the rotor shaft 2, an anti-reverse chassis 4 corresponding to the anti-reverse disk 3 is installed on the end cover 1, the anti-reverse chassis 4 is fixedly mounted on the end cover 1, and provides a basis for the reverse braking of the motor, and an anti-reverse component 5 is provided between the anti-reverse disk 3 and the anti-reverse chassis 4;

[0042] The anti-reverse assembly 5 includes a plurality of anti-reverse pins 501, which are movably mounted on the anti-reverse disk 3. A plurality of anti-reverse grooves 502 are arranged on a circumference of the anti-reverse chassis 4. The anti-reverse pins 501 are arranged corresponding to the anti-reverse grooves 502 and are plug-connected. During forward rotation, the anti-reverse pins 501 slide between different anti-reverse grooves 502. During reverse rotation, the anti-reverse pins 501 are stuck in the anti-reverse grooves 502 to prevent the rotor shaft 2 from reversing.

[0043] Specifically, by providing an end cover 1 and a rotor shaft 2, the end cover 1 is sleeved on the rotor shaft 2 and is rotatably connected to the rotor shaft 2, one end of the rotor shaft 2 extends to the outside of the end cover 1 and is installed with an anti-reverse disk 3, an anti-reverse chassis 4 corresponding to the anti-reverse disk 3 is installed on the end cover 1, an anti-reverse assembly 5 is provided between the anti-reverse disk 3 and the anti-reverse chassis 4, and the anti-reverse assembly 5 is conveniently assembled and fixed by providing the anti-reverse disk 3 and the anti-reverse chassis 4;

[0044] The anti-reverse component 5 includes a plurality of anti-reverse pins 501, which are movably installed on the anti-reverse disk 3. A plurality of anti-reverse grooves 502 are arranged on a circumference of the anti-reverse chassis 4. The anti-reverse pins 501 and the anti-reverse grooves 502 are arranged correspondingly and plug-connected. By arranging the anti-reverse pins 501 on the anti-reverse disk 3 and arranging the anti-reverse grooves 502 on a circumference of the anti-reverse chassis 4, when the rotor shaft 2 rotates normally, the anti-reverse pins 501 are in sliding contact with the anti-reverse grooves 502. When the rotor shaft 2 reverses, the anti-reverse pins 501 are stuck in the anti-reverse grooves 502 to prevent the rotor shaft 2 from reversing. The anti-reverse effect is good, and assembly, debugging and maintenance are convenient.

[0045] like Figure 1-Figure 2 As shown, in some embodiments of the utility model, a plurality of mounting holes 503 corresponding to the anti-reverse groove 502 are provided on the anti-reverse disk 3, and the anti-reverse pin 501 is movably installed in the mounting hole 503, and the end of the anti-reverse pin 501 away from the anti-reverse chassis 4 is compressed with a spring 504 for assisting the anti-reverse pin 501 in returning to its original position. The spring 504 applies a force to the anti-reverse pin 501 so that the anti-reverse pin 501 can always be in contact with the anti-reverse groove 502.

[0046] like Figure 1 As shown, in an embodiment of the utility model, the mounting hole 503 is a through hole, and an adjustment screw plug 505 is threadedly connected to the top of the through hole. One end of the spring 504 away from the anti-reverse pin 501 rests on the adjustment screw plug 505. By rotating the adjustment screw plug 505, the elastic force of the spring 504 can be adjusted, thereby adjusting the force acting on the anti-reverse pin 501.

[0047] like Figure 2 As shown, alternatively, the mounting hole 503 is a countersunk hole, which is arranged on the side of the anti-reverse disk 3 close to the anti-reverse chassis 4, and one end of the spring 504 away from the anti-reverse pin 501 rests against the inner wall of the countersunk hole. By setting the mounting hole 503 as a countersunk hole, processing and assembly are convenient, but it is not convenient to adjust the elastic force of the spring 504. In this embodiment, the mounting hole 503 adopts a through hole structure.

[0048] like Figure 5 and Figure 6As shown, in the embodiment of the utility model, the end of the anti-reverse pin 501 away from the spring 504 is provided with a rounded corner or a C-angle. By setting one end of the anti-reverse pin 501 to be rounded or a C-angle, the anti-reverse pin 501 is convenient to slide between the anti-reverse grooves 502 of the anti-reverse chassis 4 when the rotor shaft 2 rotates;

[0049] The end of the anti-reverse pin 501 that contacts the spring 504 is set to be pointed, and the pointed corner of the anti-reverse pin 501 is inserted into the hollow space of the spring 504. By designing the end of the anti-reverse pin 501 that contacts the spring 504 to be a pointed structure, one end of the anti-reverse pin 501 can extend into the hollow space of the spring 504, so that the force exerted by the spring 504 on the anti-reverse pin 501 is more balanced.

[0050] like Figure 4 As shown, in some embodiments of the present invention, each anti-reverse groove 502 is provided with an inclined surface 506 along the forward rotation direction of the rotor shaft 2, and each anti-reverse groove 502 is provided with a vertical surface 507 along the reverse rotation direction of the rotor shaft 2. By setting the inclined surface 506, the anti-reverse pin 501 can slide between different anti-reverse grooves 502 when the rotor shaft 2 rotates forward, and by setting the vertical surface 507, the anti-reverse pin 501 can be blocked when the rotor shaft 2 rotates reversely, thereby preventing the rotor shaft 2 from reversing.

[0051] like Figure 1-Figure 2 As shown, in some embodiments of the utility model, a bearing 6 is provided between the end cover 1 and the rotor shaft 2, and the two ends of the bearing 6 are respectively abutted against a bearing inner cover 7 and a bearing outer cover 8, the bearing inner cover 7 is connected to the end cover 1, and the bearing outer cover 8 is abutted against the anti-reverse disk 3. By providing the bearing 6, the bearing inner cover 7 and the bearing outer cover 8, the end cover 1 and the rotor shaft 2 are conveniently connected in rotation. At the same time, the bearing 6 can be fixed by the bearing inner cover 7 and the bearing outer cover 8 to prevent the bearing 6 from axial movement.

[0052] like Figure 1-Figure 2 As shown, in an embodiment of the utility model, the anti-reverse disk 3 is mounted on the rotor shaft 2, and the inner cavity of the anti-reverse disk 3 is connected to a connecting piece 9, which is fixedly connected to the rotor shaft 2, so that the anti-reverse disk 3 and the rotor shaft 2 are easily fixed by the connecting piece 9.

[0053] like Figure 1-Figure 2 As shown, in an embodiment of the utility model, a protrusion 301 is provided at one end of the anti-reverse disk 3 close to the anti-reverse chassis 4, and the protrusion 301 is sleeved between the anti-reverse chassis 4 and the rotor shaft 2, and abuts against the bearing outer cover 8. By providing the protrusion 301, it is convenient to fix the bearing 6. A cavity is provided at one end of the anti-reverse disk 3 away from the anti-reverse chassis 4, and a connecting member 9 is provided in the cavity and fixedly connected to the inner wall of the cavity. By providing the cavity, it is convenient to fix the connecting member 9 to the rotor shaft 2.

[0054] For ease of understanding, the working process of this embodiment is given below:

[0055] like Figure 1-Figure 6 As shown, first, the bearing 6 is mounted on the rotor shaft 2, and the bearing 6 is fixed by the bearing inner cover 7 and the bearing outer cover 8. Then, the anti-reverse chassis 4 is mounted on the rotor shaft 2, and the anti-reverse chassis 4 is fixed to the end cover 1 by bolts. Then, the anti-reverse disk 3 is mounted on the rotor shaft 2, and the raised portion 301 of the anti-reverse disk 3 is abutted against the bearing outer cover 8. The anti-reverse disk 3 is fixed to the rotor shaft 2 by the connecting piece 9, and can rotate synchronously with the rotor shaft 2. Then, the anti-reverse disk 3 is mounted on the rotor shaft 2. The pin 501 is installed in the installation hole 503 of the anti-reverse plate 3, the bottom of the anti-reverse pin 501 is inserted into the anti-reverse groove 502 of the anti-reverse chassis 4, the top of the anti-reverse pin 501 is installed with a spring 504, and the adjustment screw plug 505 is sealed. The elastic force of the spring 504 is adjusted by rotating the adjustment screw plug 505, so that the anti-reverse pin 501 can be smoothly inserted into the anti-reverse groove 502, and when the rotor shaft 2 rotates, it can slide smoothly between the anti-reverse grooves 502 without making a large noise;

[0056] When the rotor shaft 2 rotates forward, the anti-reverse pin 501 slides on the inclined surface 506 of each anti-reverse groove 502. When the rotor shaft 2 rotates reversely, the anti-reverse pin 501 is stuck in the anti-reverse groove 502, and the vertical surface 507 of the anti-reverse groove 502 prevents the rotor shaft 2 from reversing.

[0057] In summary, the utility model provides a motor anti-reversal device, which is easy to install, has a good anti-reversal effect, and is convenient to assemble, debug and maintain.

[0058] It should be understood that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. A motor anti-reverse device, characterized in that: It comprises an end cover and a rotor shaft provided on the motor, wherein the end cover is sleeved on the rotor shaft and is rotatably connected to the rotor shaft, one end of the rotor shaft extends to the outside of the end cover and is provided with an anti-reverse disk, an anti-reverse chassis provided corresponding to the anti-reverse disk is provided on the end cover, and an anti-reverse assembly is provided between the anti-reverse disk and the anti-reverse chassis; The anti-reverse assembly includes a plurality of anti-reverse pins, which are movably mounted on the anti-reverse disk. A plurality of anti-reverse grooves are arranged around the anti-reverse chassis, and the anti-reverse pins are arranged corresponding to the anti-reverse grooves and are plug-connected.

2. The motor anti-reversal device according to claim 1, characterized in that: The anti-reverse disk is provided with a plurality of mounting holes corresponding to the anti-reverse grooves, the anti-reverse pin is movably installed in the mounting hole, and one end of the anti-reverse pin away from the anti-reverse chassis is compressed with a spring to assist the anti-reverse pin in resetting.

3. The motor anti-reversal device according to claim 2, characterized in that: The mounting hole is a through hole, the top of which is threadedly connected with an adjusting screw plug, and one end of the spring away from the anti-reverse pin abuts against the adjusting screw plug; Alternatively, the mounting hole is a countersunk hole, which is arranged on a side of the anti-reverse disk close to the anti-reverse chassis, and one end of the spring away from the anti-reverse pin abuts against an inner wall of the countersunk hole.

4. The motor anti-reversal device according to claim 2, characterized in that: The anti-reverse pin has a rounded corner or a C-corner at one end away from the spring; One end of the anti-reverse pin that contacts the spring is arranged at a sharp angle, and the sharp angle of the anti-reverse pin is inserted into the hollow space of the spring.

5. The motor anti-reversal device according to claim 1, characterized in that: Each of the anti-reverse grooves is provided with an inclined surface along the forward rotation direction of the rotor shaft, and each of the anti-reverse grooves is provided with a vertical surface along the reverse rotation direction of the rotor shaft.

6. The motor anti-reversal device according to claim 1, characterized in that: A bearing is provided between the end cover and the rotor shaft, and two ends of the bearing are respectively abutted against a bearing inner cover and a bearing outer cover, the bearing inner cover is connected to the end cover, and the bearing outer cover abuts against the anti-reverse disk.

7. The motor anti-reverse device according to claim 6, characterized in that: The anti-reversal disk is sleeved on the rotor shaft, the inner cavity of the anti-reversal disk is connected with a connecting piece, and the connecting piece is fixedly connected to the rotor shaft.

8. The motor anti-reverse device according to claim 7, characterized in that: A protrusion is provided at one end of the anti-reverse disk close to the anti-reverse chassis, the protrusion is sleeved between the anti-reverse chassis and the rotor shaft, and abuts against the bearing outer cover, and a cavity is provided at one end of the anti-reverse disk away from the anti-reverse chassis, the connecting piece is arranged in the cavity, and is fixedly connected to the inner wall of the cavity.

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