Retractable structure and fixing device

Abstract

The invention discloses a folding and unfolding structure and a fixing device, and relates to the technical field of equipment maintenance in the power industry, the folding and unfolding structure comprises a rotating part, a rotating wheel, a supporting shaft arranged on the outer wall of the rotating wheel in a penetrating manner, a motor arranged at one end of the supporting shaft, and an abutting block arranged on the outer wall of the rotating wheel. The winding and unwinding structure and the fixing device have the beneficial effects that 3-5 workers do not need to participate in the winding and unwinding process of the insulating net, the whole device can be in a locked and winding and unwinding state at any time, and the stability and the reliability are high.

Description

Technical Field

[0001] The invention relates to the technical field of equipment maintenance in the electric power industry, and in particular to a retractable structure and a fixing device. Background Art

[0002] As China Southern Power Grid continues to accelerate the digital transformation of the power grid, higher requirements have been put forward for the reliability of power supply. Power reliability requirements such as "power lines can be shut down, but customers will not be shut down" and "establishing uninterrupted power demonstration areas" have been proposed one after another.

[0003] In order to ensure that the replacement of the corroded ground wire of the high-voltage line is completed without power outage of the medium and low-voltage lines, the existing method is to have maintenance personnel ride on the line to lay the insulating cross-over net, ensure that the power line under the 35kV and above power lines is energized, and safely replace the rusted overhead ground wire. However, there are the following problems when maintenance personnel ride on the line to lay the insulating cross-over net: 1. It is very dangerous. Once the protection measures are not in place, or there are major defects such as broken strands on the wires of the second protection hook, it is very easy to cause the maintenance personnel to fall off the line; 2. The maintenance personnel required to lay the insulating net have a high skill level, and there are many operators climbing the tower, at least 3-5 people, and the efficiency of laying the insulating net is low; 3. The laying process is too cumbersome and requires the cooperation of many people to carry out. Therefore, it is necessary to develop a robot to replace manual replacement. The difficulty lies in how to ensure that the insulating net can withstand the impact when the ground wire falls, and the robot's insulating net cable can ensure stability. Summary of the invention

[0004] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a retractable structure that can solve the problems of high risk and low efficiency when maintenance personnel lay insulation nets.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a retractable structure, which includes a rotating part, including a rotating wheel, a support shaft penetrating the outer wall of the rotating wheel, a motor arranged at one end of the support shaft, and an interference block arranged on the outer wall of the rotating wheel; a locking part, including a base plate, the base plate is connected to one end of the motor, a steering gear arranged on the outer wall of the base plate, a metal disk arranged at one end of the steering gear, a gear arranged at one end of the metal disk, a rack meshing with the gear, and an interference column arranged at one end of the rack.

[0008] As a preferred solution of the retractable structure of the present invention, the rotating wheel is composed of an intermediate shaft and rotating wheel pieces arranged at both ends of the intermediate shaft, and the supporting shaft passes through one end of the intermediate shaft that is not on the arc surface.

[0009] As a preferred solution of the retractable structure of the present invention, one end of the support shaft is rotatably connected to the motor, the resistance block is arranged on the outer wall of one end of the rotating wheel close to the motor, and at least one resistance block is arranged on the outer wall of the rotating wheel.

[0010] As a preferred solution of the retractable structure of the present invention, the steering gear is fixedly connected to the bottom plate, two steering gears are arranged on the outer wall of the bottom plate, and the travel of the two steering gears is synchronized.

[0011] As a preferred solution of the retractable structure of the present invention, the abutment column is fixedly connected to an end of the rack away from the servo engine, and the rack reciprocates when meshing with the gear.

[0012] As a preferred solution of the retractable structure of the present invention, when the abutment column is driven by the rack to be farthest from the steering gear during feeding, the abutment column can abut against the abutment block to prevent the rotating wheel from rotating.

[0013] As a preferred solution of the retractable structure of the present invention, the servos are arranged on both sides of the motor that are not connected to the support shaft, and the ends of the servos connected to the metal disk are close to each other.

[0014] As a preferred solution of the retractable structure of the present invention, a first through groove is provided on the bottom plate.

[0015] The beneficial effects of the retractable structure of the present invention are: driven by the large power provided by the motor, an effective power source is provided for the retractable insulation net, and at the same time the locking piece can keep the entire device in a locked and retractable state at any time, and no longer requires 3 to 5 workers to operate together, thereby improving work efficiency.

[0016] Another object of the present invention is to provide a fixing device, which aims to solve the problem of large impact force on the insulation net and low stability of the insulation net wire when the ground wire falls.

[0017] In order to solve the above technical problems, the present invention also provides the following technical solutions: a fixing device, which includes a retractable structure; and a guide rail, an axle support seat arranged on the outer wall of the guide rail, the axle support seat is penetrated by the support shaft, a positioning seat arranged on the outer wall of the axle support seat, a first fixing plate arranged between the outer wall of the base plate and the steering gear, a second fixing plate arranged on the outer wall of the base plate and connected to the rack, and a first bracket arranged between the base plate and the motor.

[0018] As a preferred solution of the fixing device described in the present invention, wherein: the shaft support seats are provided with two on both sides of the rotating wheel away from the intermediate shaft, the positioning seats can be passed through by the rack and the interference column, the number of the positioning seats is consistent with the number of the racks, the first fixing plate is fixedly connected to the base plate and the steering gear, the second fixing plate is fixedly connected to the base plate, the second fixing plate is slidably connected to the rack, and the first bracket is fixedly connected to the base plate and the motor.

[0019] The fixing device of the present invention has the beneficial effect that when the fixing device fixes the retractable structure, the ability of the insulating net to withstand the impact force when the ground wire falls can be greatly increased, and the insulating net wire can be guaranteed to be stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0021] Figure 1 It is an overall three-dimensional schematic diagram of the retractable structure and fixing device. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Example 1

[0026] Reference Figure 1, which is the first embodiment of the present invention, and this embodiment provides a retractable structure, which includes a rotating member 100, including a rotating wheel 101, a supporting shaft 102 penetrating the outer wall of the rotating wheel 101, a motor 103 arranged at one end of the supporting shaft 102, and an abutment block 101a arranged on the outer wall of the rotating wheel 101; a locking member 200, including a bottom plate 201, the bottom plate 201 is connected to one end of the motor 103, a steering gear 202 arranged on the outer wall of the bottom plate 201, a metal plate 203 arranged at one end of the steering gear 202, a gear 204 arranged at one end of the metal plate 203, a rack 205 meshing with the gear 204, and an abutment column 206 arranged at one end of the rack 205.

[0027] Among them, the rotating wheel 101 serves as a component in the retractable structure that directly contacts the insulating net. The insulating net is retracted and released at different directions of rotation of the rotating wheel 101, and one end of the insulating net is fixed on the rotating wheel 101; the support shaft 102 passes through the rotating wheel 101. It should be noted that the shape of the rotating wheel 101 can be a pulley or a winding wheel. The present scheme adopts a winding wheel. It should be noted that the winding wheel in the present scheme is composed of two discs with through grooves on the outer walls and an intermediate shaft with a diameter greater than the support shaft 102. The two discs are respectively arranged at the two ends of the non-arc surface of the intermediate shaft, and the support shaft 102 passes through the center of the disc. 2 is fixedly connected to the rotating wheel 101, and the rotating wheel 101 can be driven to rotate when the support shaft 102 rotates. The motor 103 is a worm gear motor, which has a built-in locking function. The motor 103 is rotatably connected to the support shaft 102, and the support shaft 102 is driven to rotate when the motor 103 rotates. The abutment block 101a is set on the outer wall of the disk constituting the rotating wheel 101 where no through groove is opened and the support shaft 102 does not penetrate; the function of the bottom plate 201 is to fix the locking member 200 to set a range for the position of the rotating member 100. If the bottom plate 201 is not set, the retractable structure cannot function normally without a fixed point. The steering gear 202 is fixedly connected to the bottom plate 201. The fixed connection method can be to use the positioning holes on the steering gear 202 to directly fix it to the bottom plate 201 with bolts, or to set an intermediate fixing seat between the steering gear 202 and the bottom plate 201 to fix the steering gear 202 on the intermediate fixing seat and then fix the intermediate fixing seat to the bottom plate 201; the metal plate 203 is rotatably connected to the steering gear 202. The shape of the metal plate 203 can be circular, triangular, square, etc. In this solution, a circular metal plate 203 is used. The metal plate 203 is provided with a plurality of small holes in a circular array. The connection method of the metal plate 203 and the steering gear 202 can be to use a hole at the center of the circle. It is directly connected to the output shaft of the servo 202 or there is an intermediate connecting component in the small hole of the metal disk 203 connected to the output shaft of the servo 202. When the metal disk 203 is driven to rotate by the servo 202, it also drives the gear 204 on the same axis as the metal disk 203 to rotate. The feeding direction of the rack 205 when meshing with the gear 204 is perpendicular to the non-arc outer wall of the disc of the rotating wheel 101. The interference column 206 is fixedly connected to the rack 205. When the rack 205 is fed to the maximum rotation angle of the servo 202, the interference column 206 will contact the interference block 101a when the rotating wheel 101 continues to rotate and prevent the rotating wheel 101 from continuing to rotate.

[0028] When in use, after the retractable structure is placed on the high-voltage wire, the motor 103 rotates to drive the rotating wheel 101 to rotate and reel in the wire, and the insulating net is pulled from the ground to a suitable position in the air by relying on the large torque of the motor 103. The motor 103 stops to keep the insulating net in the air unchanged, and the servo 202 rotates to drive the metal plate 203 to rotate. When the metal plate 203 is driven to rotate, the gear 204 rotates. When the gear 204 rotates, the rack 205 makes a feeding motion. When the rack 205 makes a feeding motion, the resistance column 206 fixed at one end of the rack 205 also follows the feeding motion. At the moment when the local wire falls and contacts the insulating net, the resistance column 206 contacts the resistance block 101a, preventing the rotating wheel 101 from rotating to achieve a locking effect.

[0029] In summary, when using the retractable structure of the present invention, the motor 103 provides a larger power source to pull the insulating net from the ground to high altitude, and there is no need for 3 to 5 workers to work on the high-voltage line. At the same time, the locking member 200 can realize the locking and retractable state of the retractable structure at any time, thereby improving work efficiency.

[0030] Example 2

[0031] Reference Figure 1 , which is the second embodiment of the present invention, and is different from the first embodiment in that: it also includes a rotating wheel 101 composed of an intermediate shaft 101b and rotating wheel pieces 101c arranged at both ends of the intermediate shaft 101b, and the support shaft 102 passes through one end of the non-arc surface of the intermediate shaft 101b.

[0032] Among them, the rotating wheel 101 is composed of two rotating wheel pieces 101c with through grooves on the outer walls and an intermediate shaft 101b with a diameter larger than the support shaft 102. The two rotating wheel pieces 101c are respectively arranged at the two ends of the non-arc surface of the intermediate shaft 101b. The support shaft 102 passes through the center of the disc, and the support shaft 102 passes through the center of the rotating wheel piece 101c. The support shaft 102 is fixedly connected to the rotating wheel 101, and when the support shaft 102 rotates, it can drive the rotating wheel 101 to rotate.

[0033] Furthermore, one end of the support shaft 102 is rotatably connected to the motor 103, and the resistance block 101a is disposed on an outer wall of one end of the rotating wheel 101c close to the motor 103, and at least one resistance block 101a is disposed on the outer wall of the rotating wheel 101c.

[0034] The support shaft 102 is driven to rotate by the motor 103 , and the interference block 101a having at least one is more easily released by the interference column 206 to prevent the rotating wheel 101 from rotating than the case where there is only one interference block 101a .

[0035] Furthermore, the steering gear 202 is fixedly connected to the bottom plate 201 , and two steering gears 202 are provided on the outer wall of the bottom plate 201 , and the travels of the two steering gears 202 are synchronized.

[0036] The servo 202 is fixedly connected to the base plate 201. The fixed connection method can be to use the positioning holes on the servo 202 to directly fix it to the base plate 201 with bolts, or to set an intermediate fixing seat between the servo 202 and the base plate 201, fix the servo 202 on the intermediate fixing seat, and then fix the intermediate fixing seat to the base plate 201. When the servo 202 travels synchronously, the abutment column 206 can be extended and retracted at the same time, which is beneficial to improve the efficiency of controlling the rotation and stop of the rotating wheel 101.

[0037] Furthermore, the abutment column 206 is fixedly connected to an end of the rack 205 away from the servo 202 , and the rack 205 reciprocates when meshing with the gear 204 .

[0038] The abutment column 206 and the rack 205 may be fixedly connected by welding, bolt connection, etc.

[0039] Furthermore, when the abutment column 206 is driven by the rack 205 to be farthest from the steering gear 202 during feeding, the abutment column 206 can abut against the abutment block 101 a to prevent the rotating wheel 101 from rotating.

[0040] It should be noted that the fact that the resistance column 206 can resist the resistance block 101a when it is farthest from the servo 202 does not mean that the resistance column 206 can only resist the resistance block 101a when it is farthest from the servo 202, but that the resistance column 206 has the strongest resistance effect on the resistance block 101a when it is farthest from the servo 202.

[0041] Furthermore, the steering gears 202 are arranged on both sides of the motor 103 that are not connected to the support shaft 102 , and the ends of the steering gears 202 connected to the metal plates 203 are close to each other.

[0042] The servos 202 are arranged on two sides of the motor 103 which are not connected to the support shaft 102 and are not adjacent to each other, and the sides of the two servos 202 with output shafts are arranged close to each other, that is, the motor 103 is located in the middle of the two racks 205 .

[0043] Furthermore, the bottom plate 201 is provided with a first through slot 201 a.

[0044] When no through slot is provided on the bottom plate 201, the rotating wheel 101 needs to be arranged outside the bottom plate 201 to realize the retraction and extension of the insulating net. When the first through slot 201a is provided, the rotating wheel 101 can pass through the first through slot 201a to retract and extend the insulating net.

[0045] When in use, after the retractable structure is placed on the high-voltage wire, the motor 103 rotates to drive the rotating wheel 101 to rotate and reel in the wire, and the insulating net is pulled from the ground to a suitable position in the air by relying on the large torque of the motor 103. The motor 103 stops to keep the insulating net in the air unchanged, and the servo 202 rotates to drive the metal plate 203 to rotate. When the metal plate 203 is driven to rotate, the gear 204 rotates. When the gear 204 rotates, the rack 205 makes a feeding motion. When the rack 205 makes a feeding motion, the resistance column 206 fixed at one end of the rack 205 also follows the feeding motion. At the moment when the local wire falls and contacts the insulating net, the resistance column 206 contacts the resistance block 101a, preventing the rotating wheel 101 from rotating to achieve a locking effect.

[0046] In summary, when using the retractable structure of the present invention, the motor 103 provides a larger power source to pull the insulating net from the ground to high altitude, and there is no need for 3 to 5 workers to work on the high-voltage line. At the same time, the locking member 200 can realize the locking and retractable state of the retractable structure at any time, thereby improving work efficiency.

[0047] Example 3

[0048] Reference Figure 1 , which is the third embodiment of the present invention. It is different from the previous two embodiments in that this embodiment further provides a fixing device 300: including a retractable structure, and a guide rail 301, an axle support seat 302 arranged on the outer wall of the guide rail 301, the axle support seat 302 is penetrated by the support shaft 102, a positioning seat 303 arranged on the outer wall of the axle support seat 302, a first fixing plate 304 arranged between the outer wall of the bottom plate 201 and the steering gear 202, a second fixing plate 305 arranged on the outer wall of the bottom plate 201 and connected to the rack 205, and a first bracket 306 arranged between the bottom plate 201 and the motor 103.

[0049] The shaft support seat 302 is penetrated by the support shaft 102, and the guide rail 301 is only used to raise the shaft support seat 302 so that the position of the rotating wheel 101 can make the interference column 206 and the interference block 101a easier to contact. The positioning seat 303 can be fixed on the shaft support seat 302 by welding, bolt connection and other connection methods. In this solution, bolt connection is adopted. When the positioning seat 303 is fixed on the shaft support seat 302, there is a space on the outer wall of the positioning seat 303 for the rack 205 to pass through. The space can be directly slotted or integrally formed on the positioning seat 303. The first fixing plate 304 is fixedly connected to the base plate 201 and the steering gear 202, and the fixing connection method can be welding, bolt connection, etc., and bolt connection is adopted in this scheme; the second fixing plate 305 is fixedly connected to the base plate 201, and the fixing connection method can be welding, bolt connection, etc., and bolt connection is adopted in this scheme, and the second fixing plate 305 is slidingly connected to the non-tooth surface of the rack 205; the first bracket 306 is fixedly connected to the base plate 201 and the motor 103, and the fixing connection method can be welding, bolt connection, etc., and bolt connection is adopted in this scheme.

[0050] Furthermore, two shaft support seats 302 are provided on both sides of the rotating wheel 101 away from the intermediate shaft 101b, the positioning seats 303 can be passed through by the rack 205 and the interference column 206, the number of the positioning seats 303 is consistent with the number of the rack 205, the first fixed plate 304 is fixedly connected to the base plate 201 and the servo 202, the second fixed plate 305 is fixedly connected to the base plate 201, the second fixed plate 305 is slidably connected to the rack 205, and the first bracket 306 is fixedly connected to the base plate 201 and the motor 103.

[0051] Among them, the two shaft support seats 302 are respectively located on the two sides of the rotating wheel 101 on the support shaft 102 away from the intermediate shaft 101b. Compared with the case of one shaft support seat 302, the two shaft support seats 302 are symmetrically arranged with the rotating wheel 101 as the symmetry axis, and the stability of the rotating wheel 101 during operation will be stronger; there is a space on the outer wall of the positioning seat 303 for the rack 205 to pass through, and the space can be directly grooved or set on the positioning seat 303 during integral molding; the first fixing plate 304 is fixedly connected to the bottom plate 201 and the steering gear 202, and the fixed connection method can be welding, bolt connection, etc., and this scheme adopts Bolt connection; the second fixed plate 305 is fixedly connected to the base plate 201, and the fixed connection method can be welding, bolt connection, etc., and bolt connection is adopted in this solution. The second fixed plate 305 is slidingly connected to the non-tooth surface of the rack 205, and a sliding groove can be provided on the side of the second fixed plate 305 that contacts the non-tooth surface of the rack 205; the first bracket 306 is fixedly connected to the base plate 201 and the motor 103, and the fixed connection method can be welding, bolt connection, etc., and bolt connection is adopted in this solution; the first fixed plate 304, the second fixed plate 305 and the first bracket 306 can be of any external structure if the fixing requirements are met.

[0052] When in use, the shaft support seat 302 is fixed on the guide rail 301, the support shaft 102 passes through the shaft support seat 302 and the rotating wheel 101, and the other end of the support shaft 102 is connected to the output end of the motor 103. The motor 103 is fixed to the outer wall of the base plate 201 and raised by the first bracket 306. The steering gear 202 is fixed to the outer wall of the base plate 201 by the first fixing plate 304. One end of the second fixing plate 305 is bolted to the base plate 201, and the other end of the second fixing plate 305 is slidably connected to the non-tooth surface of the rack 205. After the high-voltage line is placed on the retractable structure, the rotation of the motor 103 drives the rotating wheel 101 to rotate. When winding the wire, the insulating net is pulled from the ground to a suitable position in the air by relying on the large torque of the motor 103. The motor 103 stops to keep the insulating net in the air. When the servo 202 rotates, it drives the metal plate 203 to rotate. When the metal plate 203 is driven to rotate, the gear 204 rotates. When the gear 204 rotates, the rack 205 makes a feeding motion. When the rack 205 makes a feeding motion, the resistance column 206 fixed at one end of the rack 205 also follows the feeding motion. When the wire falls and contacts the insulating net, the resistance column 206 contacts the resistance block 101a, preventing the rotating wheel 101 from rotating to achieve a locking effect.

[0053] In summary, when using the present invention, the motor 103 provides a larger power source to pull the insulating net from the ground to high altitude, and there is no need for 3 to 5 workers to work on the high-voltage line. At the same time, the locking member 200 can realize the locking and retracting state of the retractable structure at any time, thereby improving work efficiency; the fixing device 300 enables the rotating wheel 101 to withstand the impact force of the insulating net, thereby improving the stability and reliability of the overall operation of the device. At the same time, the arrangement of the shaft support seat 302, the fixing seat 303, the first fixing plate 304, the second fixing plate 305 and the first bracket 306 facilitates the disassembly of each component for inspection and replacement.

[0054] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A retractable structure, characterized in that: include The rotating member (100) comprises a rotating wheel (101), a supporting shaft (102) penetrating the outer wall of the rotating wheel (101), a motor (103) disposed at one end of the supporting shaft (102), and a resisting block (101a) disposed on the outer wall of the rotating wheel (101); The locking member (200) comprises a base plate (201), the base plate (201) being connected to one end of the motor (103), a steering gear (202) arranged on the outer wall of the base plate (201), a metal plate (203) arranged at one end of the steering gear (202), a gear (204) arranged at one end of the metal plate (203), a rack (205) meshing with the gear (204), and a resisting column (206) arranged at one end of the rack (205).

2. The retractable structure according to claim 1, characterized in that: The rotating wheel (101) is composed of an intermediate shaft (101b) and rotating wheel pieces (101c) arranged at both ends of the intermediate shaft (101b), and the supporting shaft (102) passes through one end of the intermediate shaft (101b) which is not on the arc surface.

3. The retractable structure according to claim 2, characterized in that: One end of the support shaft (102) is rotatably connected to the motor (103), and the abutment block (101a) is arranged on the outer wall of one end of the rotating wheel (101c) close to the motor (103), and at least one abutment block (101a) is arranged on the outer wall of the rotating wheel (101c).

4. The retractable structure according to claim 3, characterized in that: The steering gear (202) is fixedly connected to the bottom plate (201), and two steering gears (202) are provided on the outer wall of the bottom plate (201), and the travels of the two steering gears (202) are synchronized.

5. The retractable structure according to claim 4, characterized in that: The abutment column (206) is fixedly connected to an end of the rack (205) away from the steering gear (202), and the rack (205) reciprocates in meshing connection with the gear (204).

6. The retractable structure according to claim 5, characterized in that: When the abutment column (206) is driven by the rack (205) to advance to the farthest distance from the steering gear (202), the abutment column (206) can abut against the abutment block (101a) to prevent the rotating wheel (101) from rotating.

7. The retractable structure according to claim 6, characterized in that: The steering gear (202) is arranged on both sides of the motor (103) that are not connected to the support shaft (102), and the ends of the steering gear (202) connected to the metal plate (203) are close to each other.

8. The retractable structure according to claim 7, characterized in that: The bottom plate (201) is provided with a first through slot (201a).

9. A fixing device (300), characterized in that: It comprises the retractable and retractable structure as described in any one of claims 1 to 8, and a guide rail (301), an axle support seat (302) arranged on the outer wall of the guide rail (301), the axle support seat (302) being penetrated by a support shaft (102), a positioning seat (303) arranged on the outer wall of the axle support seat (302), a first fixing plate (304) arranged between the outer wall of the base plate (201) and the steering gear (202), a second fixing plate (305) arranged on the outer wall of the base plate (201) and connected to the rack (205), and a first bracket (306) arranged between the base plate (201) and the motor (103).

10. The fixing device according to claim 9, characterized in that: The shaft support seats (302) are provided with two on both sides of the rotating wheel (101) away from the intermediate shaft (101b); the positioning seats (303) can be passed through by the rack (205) and the abutment column (206); the number of the positioning seats (303) is consistent with the number of the rack (205); the first fixing plate (304) is fixedly connected to the bottom plate (201) and the steering gear (202); the second fixing plate (305) is fixedly connected to the bottom plate (201); the second fixing plate (305) is slidably connected to the rack (205); and the first bracket (306) is fixedly connected to the bottom plate (201) and the motor (103).

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