A cable reeling device

Abstract

This invention discloses a cable reeling / unwinding device, belonging to the technical field of reeling / unwinding devices. It includes: a support assembly comprising a mounting component; a body assembly comprising a carrier rotatably mounted on the mounting component, a rotating shaft disposed on the carrier, a movable component slidably mounted on the carrier, an adjusting component slidably mounted on the rotating shaft, and a connecting component disposed on the movable component, the connecting component being kinetically connected to both the adjusting component and the rotating shaft; and a locking assembly comprising a limiting component elastically mounted on the carrier and an abutting component elastically mounted on the rotating shaft, the limiting component being adapted to engage with the movable component. By adjusting the position of the movable component using the adjusting component and the connecting component, the distance from the movable component to the central axis of the carrier is increased, enabling the cable reeling / unwinding device to accommodate larger cables and providing sufficient space for cable bending.

Description

Technical Field

[0001] This invention relates to the field of cable winding and unwinding devices, and in particular to a cable winding and unwinding device. Background Technology

[0002] Electric wires and cables refer to materials used for power, electrical, and related transmission purposes. There is no strict boundary between "electric wire" and "cable". Generally, products with fewer cores, smaller diameters, and simpler structures are called electric wires, those without insulation are called bare wires, and others are called cables. Conductor cross-sectional areas with larger cross-sectional areas (greater than 6 square millimeters) are called large cables, and those with smaller cross-sectional areas (less than or equal to 6 square millimeters) are called small wires or building wires.

[0003] The rollers in existing cable winding and unwinding devices are generally fixed on a rotating disk. The distance between the rollers is either not adjustable or the rollers are detachable, requiring adjustment one by one, which is inefficient. If the distance between the rollers is small, small wires can be wound around the rollers relatively easily. However, large cables with larger conductor cross-sectional areas are difficult to adapt to cable winding and unwinding devices with smaller distances between the rollers because their bending range is not as large as that of small wires. Winding up large cables is difficult and may even damage them. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing cable winding and unwinding devices, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to adapt the cable winding and unwinding device to cables of large size.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a cable reeling device, comprising: a support assembly including a mounting member; a body assembly including a carrier member rotatably mounted on the mounting member, a rotating shaft disposed on the carrier member, a movable member slidably mounted on the carrier member, an adjusting member slidably mounted on the rotating shaft, and a connecting member disposed on the movable member, the connecting member being kinetically connected to both the adjusting member and the rotating shaft; and a locking assembly including a limiting member elastically mounted on the carrier member and an abutting member elastically mounted on the rotating shaft, the limiting member being adapted to engage with the movable member.

[0008] In a preferred embodiment of the cable winding and unwinding device of the present invention, the mounting component includes a base and a support frame, the support frame is disposed on the top of the base, and there are two support frames arranged parallel to each other.

[0009] In a preferred embodiment of the cable winding and unwinding device of the present invention, the carrier includes a mounting plate and a limiting plate, the mounting plate and the limiting plate are rotatably mounted on the mounting component, the mounting plate and the limiting plate are arranged parallel to each other, the mounting plate is provided with a sliding groove, a plurality of sliding grooves are provided, the central axes of the plurality of sliding grooves intersect on the central axis of the mounting plate, and the plurality of sliding grooves are evenly arranged around the circumference of the mounting plate.

[0010] In a preferred embodiment of the cable winding and unwinding device of the present invention, the two ends of the rotating shaft are fixedly connected to the mounting plate and the limiting plate, respectively. The central axis of the rotating shaft passes through the center of the mounting plate and the center of the limiting plate. The rotating shaft is provided with a mounting cavity, which passes through the end of the rotating shaft near the mounting plate. A through groove is formed on the circumferential surface of the rotating shaft, which communicates with the mounting cavity. The central axis of the through groove is parallel to the central axis of the rotating shaft. Multiple through grooves are provided, and the multiple through grooves are evenly arranged around the circumference of the rotating shaft.

[0011] In a preferred embodiment of the cable winding and unwinding device of the present invention, the movable component includes a movable rod, which is slidably installed in the slide groove. A spring is provided on the movable rod, and the spring is connected to the inner wall of the slide groove on the side away from the center of the mounting plate.

[0012] In a preferred embodiment of the cable winding and unwinding device of the present invention, the adjusting component includes a sliding column, which is slidably mounted in the mounting cavity of the rotating shaft. A clearance groove is formed on the circumferential surface of the sliding column, and the central axis of the clearance groove is parallel to the central axis of the sliding column. Multiple clearance grooves are provided, and each clearance groove corresponds to a through groove. A push rod is provided on the sliding column, and a through hole is provided on the mounting plate. The through hole penetrates both ends of the mounting plate, and the push rod is adapted to extend from the through hole to the outside of the mounting plate.

[0013] In a preferred embodiment of the cable winding and unwinding device of the present invention, the connecting member includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to the movable rod, and the other end of the first connecting rod is hinged to the clearance groove of the sliding column. One end of the second connecting rod is hinged to the first connecting rod, and the other end of the second connecting rod is provided with a third connecting rod. One end of the third connecting rod is slidably connected to the second connecting rod, and the other end of the third connecting rod is hinged to the rotating shaft.

[0014] In a preferred embodiment of the cable winding and unwinding device of the present invention, the limiting member includes a ratchet, the mounting plate is further provided with a mounting groove, the mounting groove is connected to the sliding groove, multiple mounting grooves are provided, the mounting grooves and the sliding grooves are arranged one-to-one, the ratchet is elastically installed in the mounting groove, the movable rod is provided with ratchet teeth, the ratchet teeth are adapted to engage with the ratchet, and the ratchet is used to restrict the movable rod from moving towards the center of the mounting plate.

[0015] In a preferred embodiment of the cable winding and unwinding device of the present invention, the abutting member includes a counterweight, a limiting groove is formed on the rotating shaft, a plurality of limiting grooves are provided, the central axes of the plurality of limiting grooves intersect on the central axis of the rotating shaft, the plurality of limiting grooves are evenly arranged around the circumference of the rotating shaft, the counterweight is elastically installed in the limiting groove, the counterweight abuts against the third connecting rod, and the counterweight is adapted to restrict the rotation of the third connecting rod.

[0016] In a preferred embodiment of the cable winding and unwinding device of the present invention, the ratchet is further provided with a pull rod, the end face of the mounting plate away from the limiting plate is provided with a mounting hole, the pull rod is slidably installed in the mounting hole, one end of the pull rod is connected to the ratchet, and the other end of the pull rod is provided with an unlocking ring.

[0017] The beneficial effects of this invention are as follows: by adjusting the position of the movable part through the adjusting part and the connecting part, the distance between the movable part and the central axis of the bearing part is increased, so that this cable winding and unwinding device can adapt to larger cables and provide sufficient space for cable bending. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0019] Figure 1 This is a structural diagram of a cable winding and unwinding device.

[0020] Figure 2 This is a diagram showing the relationship between the components of the cable winding and unwinding device.

[0021] Figure 3 for Figure 2 A magnified view of region A in the middle.

[0022] Figure 4 This is a cross-sectional view of the cable winding and unwinding device. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "an 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 phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0026] Example 1

[0027] Reference Figures 1-4 This is the first embodiment of the present invention. This embodiment provides a cable winding and unwinding device, which includes a support component 100, a body component 200, and a locking component 300. The support component 100 is used to support the body component 200, the body component 200 is used to wind up the cable, and the locking component 300 keeps the body component 200 stable.

[0028] Specifically, the support assembly 100 includes a mounting member 101, which is placed on a flat surface during use; the body assembly 200 includes a carrier member 201, a rotating shaft 202, a movable member 203, an adjusting member 204, and a connecting member 205. The carrier member 201 is rotatably mounted on the mounting member 101, the rotating shaft 202 is disposed on the carrier member 201, the movable member 203 is slidably mounted on the carrier member 201, the adjusting member 204 is slidably mounted on the rotating shaft 202, and the connecting member... 205 is simultaneously connected to the adjusting member 204 and the rotating shaft 202; the locking assembly 300 includes a limiting member 301 elastically mounted on the bearing member 201 and an abutting member 302 elastically mounted on the rotating shaft 202. The limiting member 301 is adapted to engage with the movable member 203. In use, the operator adjusts the adjusting member 204, which drives the movable member 203 to move through the connecting member 205, thereby increasing the distance between the movable member 203 and the central axis of the bearing member 201.

[0029] In use, the operator adjusts the adjusting component 204, which drives the movable component 203 to move through the connecting component 205. This increases the distance between the movable component 203 and the central axis of the bearing component 201, allowing the cable winding and unwinding device to accommodate larger cables and provide sufficient space for cable bending.

[0030] Example 2

[0031] Reference Figures 1-4 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0032] Specifically, the mounting component 101 includes a base 101a and a support frame 101b. The support frame 101b is located on top of the base 101a. There are two support frames 101b, which are arranged parallel to each other. In use, the base 101a is placed on a flat surface, and the support frame 101b is used to support the carrier component 201.

[0033] Preferably, the carrier 201 includes a mounting plate 201a and a limiting plate 201b. Both the mounting plate 201a and the limiting plate 201b are cylindrical in shape. The mounting plate 201a and the limiting plate 201b are rotatably mounted on the support frames 101b on the left and right sides, respectively. The mounting plate 201a and the limiting plate 201b are arranged parallel to each other. The end face of the mounting plate 201a facing the limiting plate 201b is provided with a sliding groove 201a-1. There are six sliding grooves 201a-1. The central axes of the six sliding grooves 201a-1 intersect on the central axis of the mounting plate 201a, and the six sliding grooves 201a-1 are evenly arranged around the circumference of the mounting plate 201a. The end face of the limiting plate 201b facing the mounting plate 201a is also provided with six grooves. The six grooves correspond one-to-one with the six sliding grooves 201a-1. In use, the mounting plate 201a and the limiting plate 201b rotate synchronously.

[0034] Preferably, the rotating shaft 202 is disposed between the mounting plate 201a and the limiting plate 201b, and the left and right ends of the rotating shaft 202 are fixedly connected to the mounting plate 201a and the limiting plate 201b respectively. The central axis of the rotating shaft 202 passes through the center of the mounting plate 201a and the center of the limiting plate 201b. The rotating shaft 202 is provided with a mounting cavity 202a, which passes through the end of the rotating shaft 202 near the mounting plate 201a. A through groove 202b is provided on the circumferential surface of the rotating shaft 202, which is connected to the mounting cavity 202a. The central axis of the through groove 202b is parallel to the central axis of the rotating shaft 202. There are six through grooves 202b, which are evenly arranged around the circumference of the rotating shaft 202.

[0035] Preferably, the movable component 203 includes a movable rod 203a, which is located between the mounting plate 201a and the limiting plate 201b. The left end of the movable rod 203a is slidably installed in the groove 201a-1 of the mounting plate 201a, and the right end of the movable rod 203a is slidably installed in the groove of the limiting plate 201b. A spring 203b is provided on the movable rod 203a. The spring 203b is connected to the inner wall of the groove 201a-1 on the side away from the center of the mounting plate 201a. The spring 203b provides elastic force to reset the movable rod 203a to the initial position. In this embodiment, there are six movable rods 203a, and the six movable rods 203a are arranged in a one-to-one correspondence with the six grooves 201a-1.

[0036] Preferably, the adjusting component 204 includes a sliding column 204a, which is slidably installed in the mounting cavity 202a of the rotating shaft 202. A clearance groove 204a-1 is provided on the circumferential surface of the sliding column 204a. The central axis of the clearance groove 204a-1 is parallel to the central axis of the sliding column 204a. There are six clearance grooves 204a-1, each corresponding to one of the six through grooves 202b. A push rod 204b is provided at the left end of the sliding column 204a. A through hole is provided on the mounting plate 201a, penetrating both ends of the mounting plate 201a. The central axis of the through hole coincides with the central axis of the mounting plate 201a. The push rod 204b is adapted to extend from the through hole to the outside of the mounting plate 201a. When the operator pushes the push rod 204b, the sliding column 204a can slide in the mounting cavity 202a.

[0037] Furthermore, the connector 205 includes a first connecting rod 205a and a second connecting rod 205b. One end of the first connecting rod 205a is hinged to the middle of the movable rod 203a, and the other end of the first connecting rod 205a is hinged to the clearance groove 204a-1 of the sliding column 204a. When the first connecting rod 205a rotates, the clearance groove 204a-1 and the first connecting rod 205a do not interfere with each other. One end of the second connecting rod 205b is hinged to the middle of the first connecting rod 205a. The other end of the connecting rod 205b is a sliding sleeve, and a third connecting rod 205c is elastically installed inside the sliding sleeve. One end of the third connecting rod 205c is slidably connected to the second connecting rod 205b, and the other end of the third connecting rod 205c is hinged to the through groove 202b of the rotating shaft 202. When the first connecting rod 205a rotates, the third connecting rod 205c adaptively extends and retracts in the sliding sleeve of the second connecting rod 205b, thereby avoiding interference and jamming between the second connecting rod 205b and the first connecting rod 205a.

[0038] Furthermore, the limiting component 301 includes a ratchet 301a, and the mounting plate 201a is also provided with mounting grooves 201a-3, which are connected to the sliding grooves 201a-1. There are six mounting grooves 201a-3, and the six mounting grooves 201a-3 are arranged one-to-one with the six sliding grooves 201a-1. The ratchet 301a is elastically installed in the mounting grooves 201a-3, and the movable rod 203a is provided with ratchet teeth 203a-1, which are adapted to engage with the ratchet 301a. The ratchet 301a is used for limiting... The movable rod 203a moves towards the center of the mounting plate 201a, but the ratchet 301a does not restrict the movable rod 203a from moving away from the center of the mounting plate 201a. In use, the operator pushes the sliding column 204a to slide in the mounting cavity 202a through the push rod 204b, and drives the movable rod 203a to slide in the slide groove 201a-1 of the mounting plate 201a through the first connecting rod 205a. After all six movable rods 203a have expanded to the appropriate position, the ratchet 301a restricts the movable rod 203a to return to its original position.

[0039] Furthermore, the abutting component 302 includes a counterweight 302a. Six limiting grooves 202c are provided on the rotating shaft 202, and their central axes intersect on the central axis of the rotating shaft 202. The six limiting grooves 202c are evenly arranged around the circumference of the rotating shaft 202. The counterweight 302a is elastically mounted in the limiting groove 202c by a return spring. The counterweight 302a abuts against the third connecting rod 205c. 2a is suitable for restricting the rotation of the third connecting rod 205c; when the six movable rods 203a expand outward, the first connecting rod 205a rotates, thereby driving the second connecting rod 205b to rotate. When the second connecting rod 205b rotates, it will drive the third connecting rod 205c to extend and retract on the second connecting rod 205b. At the same time, the third connecting rod 205c rotates around the hinge point of the through groove 202b of the rotating shaft 202. When the cable is first wound up, since the cable is less wound on the movable rod 203a, the force of the cable winding and tightening on the movable rod 203a is small. When the mounting plate 201a, rotating shaft 202 and limiting plate 201b of the cable winding and unwinding device rotate synchronously, the movable rod 203a will continue to expand outward due to centrifugal force. At this time, the counterweight 302a will also gradually abut against the third connecting rod 205c under the centrifugal force, thereby restricting the rotation of the third connecting rod 205c, thereby restricting the rotation of the second connecting rod 205b and the first connecting rod 205a. The movement of the movable rod 203a is restricted, thus limiting its outward expansion. This ensures that the movable rod 203a remains stable when the cable winding device winds up the cable. Furthermore, the faster the mounting plate 201a, rotating shaft 202, and limiting plate 201b rotate, the tighter the counterweight 302a abuts against the third connecting rod 205c, and the more stable the movable rod 203a becomes. Compared to cable winding devices that require manual adjustment of the position of each movable rod 203a, this cable winding device offers higher efficiency in adjusting the movable rod 203a.

[0040] Furthermore, the ratchet 301a is also provided with a pull rod 301b. The end face of the mounting plate 201a away from the limit plate 201b is provided with a mounting hole. The pull rod 301b is slidably installed in the mounting hole. One end of the pull rod 301b is connected to the ratchet 301a, and the other end of the pull rod 301b is provided with an unlocking ring 301c. When the cable is unloaded, the operator can pull the unlocking ring 301c outward to disengage the ratchet 301a from the ratchet tooth 203a-1 on the movable rod 203a. The movable rod 203a is reset under the action of the spring 203b.

[0041] To facilitate understanding of this cable reel-in / out device, its working process is briefly described below:

[0042] During the preparation phase, the operator pushes the sliding column 204a to slide in the mounting cavity 202a through the push rod 204b, and drives the movable rod 203a to slide in the groove 201a-1 of the mounting plate 201a through the first connecting rod 205a, so that the six movable rods 203a expand outward, that is, adjust the diameter of the cable take-up and take-down device to accommodate cables with larger diameters.

[0043] During the winding stage, when the cable winding device is driven by the motor to rotate, because the cable wound on the movable rod 203a is initially too small, the inward pressure on the movable rod 203a is too small. At this time, when rotating, the movable rod 203a will tend to move outward due to centrifugal force. At this time, the counterweight 302a will also gradually come into contact with the third connecting rod 205c under the centrifugal force, thereby restricting the rotation of the third connecting rod 205c, thereby restricting the rotation of the second connecting rod 205b and the first connecting rod 205a, thereby restricting the outward expansion of the movable rod 203a, so that the movable rod 203a remains stable when the cable winding device winds up the cable.

[0044] The principle of the unwinding stage is the same as above; finally, the operator pulls the unlocking ring 301c outward, so that the ratchet 301a disengages from the ratchet 203a-1 on the movable rod 203a, and the movable rod 203a is reset under the action of the spring 203b.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A cable reeling / unwinding device, characterized in that: include, Support assembly (100), including mounting component (101); The main body assembly (200) includes a support member (201) rotatably mounted on the mounting member (101), a rotating shaft (202) disposed on the support member (201), a movable member (203) slidably mounted on the support member (201), an adjusting member (204) slidably mounted on the rotating shaft (202), and a connecting member (205) disposed on the movable member (203), wherein the connecting member (205) is simultaneously connected to the adjusting member (204) and the rotating shaft (202) in a transmission manner; The locking assembly (300) includes a limiting member (301) elastically mounted on the carrier (201) and an abutment member (302) elastically mounted on the rotating shaft (202), the limiting member (301) being adapted to engage with the movable member (203); The carrier (201) includes a mounting plate (201a) and a limiting plate (201b). The mounting plate (201a) and the limiting plate (201b) are rotatably mounted on the mounting component (101). The mounting plate (201a) and the limiting plate (201b) are arranged parallel to each other. The mounting plate (201a) is provided with a sliding groove (201a-1). There are multiple sliding grooves (201a-1). The central axes of the multiple sliding grooves (201a-1) intersect on the central axis of the mounting plate (201a). The multiple sliding grooves (201a-1) are evenly arranged around the circumference of the mounting plate (201a). The movable component (203) includes a movable rod (203a), which is slidably installed in the slide groove (201a-1). A spring (203b) is provided on the movable rod (203a), and the spring (203b) is connected to the inner wall of the slide groove (201a-1) on the side away from the center of the mounting plate (201a). The connector (205) includes a first connecting rod (205a), a second connecting rod (205b), and a third connecting rod (205c); The limiting member (301) includes a ratchet (301a), and the mounting plate (201a) is also provided with a mounting groove (201a-3). The mounting groove (201a-3) is connected to the sliding groove (201a-1). There are multiple mounting grooves (201a-3), and the mounting grooves (201a-3) and the sliding grooves (201a-1) are arranged in a one-to-one correspondence. The ratchet (301a) is elastically installed in the mounting groove (201a-3). The movable rod (203a) is provided with a ratchet tooth (203a-1). The ratchet tooth (203a-1) is adapted to engage with the ratchet (301a). The ratchet (301a) is used to limit the movement of the movable rod (203a) towards the center of the mounting plate (201a). The abutting member (302) includes a counterweight (302a). A limiting groove (202c) is provided on the rotating shaft (202). Multiple limiting grooves (202c) are provided. The central axes of the multiple limiting grooves (202c) intersect on the central axis of the rotating shaft (202). The multiple limiting grooves (202c) are evenly arranged around the circumference of the rotating shaft (202). The counterweight (302a) is elastically installed in the limiting groove (202c). The counterweight (302a) abuts against the third connecting rod (205c). The counterweight (302a) is adapted to restrict the rotation of the third connecting rod (205c).

2. The cable winding and unwinding device as described in claim 1, characterized in that: The mounting component (101) includes a base (101a) and a support frame (101b). The support frame (101b) is disposed on the top of the base (101a). There are two support frames (101b), which are arranged parallel to each other.

3. The cable winding and unwinding device as described in claim 1, characterized in that: The two ends of the rotating shaft (202) are fixedly connected to the mounting plate (201a) and the limiting plate (201b) respectively. The central axis of the rotating shaft (202) passes through the center of the mounting plate (201a) and the center of the limiting plate (201b). The rotating shaft (202) is provided with a mounting cavity (202a). The mounting cavity (202a) passes through the end of the rotating shaft (202) near the mounting plate (201a). A through groove (202b) is provided on the circumferential surface of the rotating shaft (202). The through groove (202b) is connected to the mounting cavity (202a). The direction of the central axis of the through groove (202b) is parallel to the direction of the central axis of the rotating shaft (202). There are multiple through grooves (202b), and the multiple through grooves (202b) are evenly arranged around the circumference of the rotating shaft (202).

4. The cable winding and unwinding device as described in claim 3, characterized in that: The adjusting component (204) includes a sliding column (204a), which is slidably installed in the mounting cavity (202a) of the rotating shaft (202). A clearance groove (204a-1) is provided on the circumferential surface of the sliding column (204a). The central axis of the clearance groove (204a-1) is parallel to the central axis of the sliding column (204a). Multiple clearance grooves (204a-1) are provided, and each clearance groove (204a-1) corresponds to a through groove (202b). A push rod (204b) is provided on the sliding column (204a), and a through hole is provided on the mounting plate (201a). The through hole penetrates both ends of the mounting plate (201a), and the push rod (204b) is adapted to extend from the through hole to the outside of the mounting plate (201a).

5. The cable winding and unwinding device as described in claim 4, characterized in that: One end of the first connecting rod (205a) is hinged to the movable rod (203a), and the other end of the first connecting rod (205a) is hinged to the clearance groove (204a-1) of the sliding column (204a); one end of the second connecting rod (205b) is hinged to the first connecting rod (205a), and the other end of the second connecting rod (205b) is provided with a third connecting rod (205c). One end of the third connecting rod (205c) is slidably connected to the second connecting rod (205b), and the other end of the third connecting rod (205c) is hinged to the rotating shaft (202).

6. The cable winding and unwinding device as described in claim 5, characterized in that: The ratchet (301a) is also provided with a pull rod (301b). The end face of the mounting plate (201a) away from the limiting plate (201b) is provided with a mounting hole. The pull rod (301b) is slidably installed in the mounting hole. One end of the pull rod (301b) is connected to the ratchet (301a), and the other end of the pull rod (301b) is provided with an unlocking ring (301c).

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