Fixing mechanism and rapid arrangement and storage device for fence net
By designing a fixing mechanism including driving components, rotating components, adjustment components and locking components, the problem of low efficiency and unstableness of the fence device when laying and storing the fence net is solved, and efficient and stable fence net arrangement and storage is achieved. .
Patent Information
- Application Number
- CN202420113398.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-17
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-01-17
AI Technical Summary
The existing fence devices are inefficient in laying and storing fence nets, and the devices are unstable, resulting in more labor and time spent by the operators.
A fixing mechanism is designed, including a driving component, a rotating component, an adjustment component and a locking component. Through the cooperation of these components, the fence net can be quickly arranged and stored, operating efficiency can be improved, and the stability of the device can be enhanced through the support component.
The layout and storage efficiency of fence nets is improved, and the probability that people do not perform fence layout due to "fear of trouble" is reduced. At the same time, the stability of fence nets is ensured during layout and storage is ensured, and the fence nets are prevented from spreading.
Smart Images

Figure CN222436058U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fence nets, and in particular to a fixing mechanism and a fence net rapid arrangement and storage device. Background Art
[0002] Fence net is a kind of facility widely used in gardening, construction, animal husbandry and other fields. As people's demand for fence nets continues to increase, the convenience of its installation and storage has become an increasingly important consideration. However, when using fence nets, the fence net is usually set on the fence device.
[0003] However, the existing fence devices are usually affected by the design of the fence net (mesh) itself, which causes the operators to spend more manpower and time when arranging and storing the fence, greatly reducing the work efficiency. In addition, the fence device may be unstable when arranging and storing the fence net. Utility Model Content
[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.
[0005] In view of the problem that the arrangement and storage of the fence net in the above-mentioned or prior art consumes much manpower and time, thereby reducing the working efficiency, the present utility model is proposed.
[0006] Therefore, the utility model aims to provide a fixing mechanism.
[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: including a driving component and a rotating component arranged on the driving component; wherein the driving component includes an adjusting component and a locking component connected to the adjusting component.
[0008] As a preferred solution of the fixing mechanism of the utility model, wherein: the adjusting assembly includes a fixing member and an adjusting member connected to the fixing member; the fixing member includes a fixing column and a front groove opened on the fixing column.
[0009] As a preferred solution of the fixing mechanism of the utility model, the adjusting member includes an adjusting column, a through groove formed on the adjusting column, a transverse groove formed on the adjusting column, an arc groove formed on the adjusting column, and a straight groove formed on the adjusting column.
[0010] As a preferred solution of the fixing mechanism of the utility model, wherein: the locking assembly includes a telescopic part, and a resistance part arranged on the telescopic part; wherein the resistance part includes a grip rod, an arc pressure plate fixedly connected to the grip rod, and a locking pin fixedly connected to the arc pressure plate.
[0011] As a preferred solution of the fixing mechanism of the utility model, the telescopic member includes a sliding column, an inner groove opened on the sliding column, a rotating block rotatably connected to the inner groove, an adjusting spring fixedly connected to the rotating block, and a locking column fixed on the sliding column.
[0012] As a preferred solution of the fixing mechanism of the utility model, the rotating component includes a reel fixedly connected to the fixing column, a bearing arranged at the bottom of the reel, a fixed rod arranged on the bearing, and a hook arranged on the outer wall of the reel.
[0013] As a preferred solution of the fixing mechanism of the utility model, wherein: the adjusting member also includes a plate groove opened on the adjusting column, and a trapezoidal sliding block fixed in the plate groove; the fixing member also includes a plate fixedly connected to the fixing column, and a trapezoidal groove opened on the plate.
[0014] As a preferred solution of the fixing mechanism of the utility model, wherein: the telescopic member further includes a blocking block fixedly connected to the sliding column; the adjusting member further includes a blocking groove opened on the side of the through groove.
[0015] The fixing mechanism of the utility model has beneficial effects: through the cooperation of the adjustment component and the locking component, it is helpful to improve the efficiency of operators in arranging and storing fence nets, reduce the probability of violations indirectly caused by people not performing fence arrangement due to "fear of trouble" psychology, and at the same time, it can also control the arrangement length of the fence net during arrangement, and can also control it after being stored on the reel to prevent the fence net from spreading out and causing inconvenience.
[0016] In actual use, there is still a problem that the fence net quick arrangement and storage device is placed on the ground instability when the fence net is arranged and stored.
[0017] In order to solve the above technical problems, the utility model also provides the following technical solutions: a fence net quick arrangement and storage device, including a supporting component; the supporting component includes a bracket assembly, and a retracting assembly arranged on the bracket assembly; the rotating component is connected to the supporting component.
[0018] As a preferred solution of the fence net quick arrangement and storage device of the utility model, the bracket assembly includes a bracket plate, a pull groove arranged on the bracket plate, and a diagonal support surface arranged at the bottom of the bracket plate; the collection and pulling assembly includes a pull column placed in the pull groove and a pull plate fixedly connected to both ends of the pull column.
[0019] The beneficial effects of the utility model are as follows: by unfolding the supporting components, the oblique supporting surface is made flush with the ground of the fixed pole, which provides supporting force for the fixed pole, thereby enhancing the stability of the quick arrangement storage device of the fence net. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:
[0021] Figure 1 It is a schematic diagram of the structure of the rotating parts of the fixing mechanism of the utility model.
[0022] Figure 2 It is a schematic diagram of the overall structure of the fixing mechanism of the utility model.
[0023] Figure 3 It is a schematic diagram of the structure of the driving component of the fixing mechanism of the utility model.
[0024] Figure 4 It is a schematic diagram of the structure of the adjustment component of the fixing mechanism of the utility model.
[0025] Figure 5 It is a schematic diagram of the structure of the adjusting member of the fixing mechanism of the utility model.
[0026] Figure 6 It is a schematic diagram of the locking assembly structure of the fixing mechanism of the utility model.
[0027] Figure 7 It is a schematic diagram of the trapezoidal slider structure of the fixing mechanism of the utility model.
[0028] Figure 8 It is a schematic diagram of the trapezoidal groove structure of the fixing mechanism of the utility model.
[0029] Fig. 9 Schematic diagram of the overall structure of the storage device for quickly arranging the fence net. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.
[0031] 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.
[0032] 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 does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.
[0033] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.
[0034] Example 1
[0035] Reference Figures 1 to 8 , which is the first embodiment of the utility model, provides a fixing mechanism, which can solve the problem that the fence net consumes more manpower and time when arranged and stored, and reduces the working efficiency, and includes a driving component 100, and a rotating component 200 arranged on the driving component 100; wherein the driving component 100 includes an adjusting component 101, and a locking component 102 connected to the adjusting component 101. One end of the fence net is connected to the rotating component 200, and then the rotating component 200 is driven by the driving component 100 to rotate, and then the fence net can be controlled to be quickly arranged and stored, thereby improving the efficiency of the operator in arranging and storing the fence net.
[0036] Specifically, the adjustment component 101 includes a fixing member 101a and an adjustment member 101b connected to the fixing member 101a; the fixing member 101a includes a fixing column 101a-1 and a front groove 101a-2 provided on the fixing column 101a-1. The adjustment member 101b includes an adjustment column 101b-1, a through groove 101b-2 provided on the adjustment column 101b-1, a transverse groove 101b-3 provided on the adjustment column 101b-1, an arc groove 101b-4 provided on the adjustment column 101b-1, and a straight groove 101b-5 provided on the adjustment column 101b-1. The fixing column 101a-1 is connected to the adjustment column 101b-1, and the inner diameters of the front groove 101a-2 and the through groove 101b-2 are consistent.
[0037] Furthermore, the locking assembly 102 includes a telescopic member 102a and a resisting member 102b disposed on the telescopic member 102a; wherein the resisting member 102b includes a gripping rod 102b-1, an arc pressure plate 102b-2 fixedly connected to the gripping rod 102b-1, and a locking pin 102b-3 fixedly connected to the arc pressure plate 102b-2. The telescopic member 102a includes a sliding column 102a-1, an inner groove 102a-2 provided on the sliding column 102a-1, a rotating block 102a-3 rotatably connected to the inner groove 102a-2, an adjusting spring 102a-4 fixedly connected to the rotating block 102a-3, and a locking column 102a-5 fixed to the sliding column 102a-1. One end of the slide post 102a-1 is placed in the through slot 101b-2, the other end of the slide post 102a-1 is fixedly connected to the gripping rod 102b-1, one end of the adjustment spring 102a-4 is fixedly connected to the rotating block 102a-3, and the other end of the adjustment spring 102a-4 is fixedly connected to the bottom wall of the front slot 101a-2. When arranging the fence net, the locking post 102a-5 is placed in the straight slot 101b-5, at this time, the gripping rod 102b-1 is in a vertically upward state, and the adjustment spring 102a-4 is in an extended state. The diameter of the gripping rod 102b-1 is smaller than that of the sliding column 102a-1. The gripping rod 102b-1 is matched with the transverse groove 101b-3, which is conducive to preventing the sliding column 102a-1 from being separated from the adjusting column 101b-1. When the fence net is stopped, the gripping rod 102b-1 is driven vertically downward by rotating the sliding column 102a-1. The sliding column 102a-1 is affected by the tension of the adjustment spring 102a-4 to return and shrink, and then drives the arc pressure plate 102b-2 to be close to the fence net on the rotating component 200, which is conducive to controlling the length of the fence net. By setting the arc pressure plate 102b-2 as an arc plate and matching it with the driving component 100, it is conducive to better fitting and pressing with the fence net. The locking pin 102b-3 is made of soft material, which can better lock the fence net without hurting people.
[0038] Preferably, the rotating component 200 includes a reel 201 fixedly connected to the fixed column 101a-1, a bearing 202 arranged at the bottom of the reel 201, a fixed rod 203 arranged on the bearing 202, and a hook 204 arranged on the outer wall of the reel 201. The fixed column 101a-1 is fixedly connected to the reel 201, and one end of the fence net is hooked on the hook 204. The hook 204 is arranged to facilitate the connection of the fence net with the reel 201, thereby controlling the arrangement and storage of the fence net. The reel 201 is fixedly connected to the outer shaft of the bearing 202, and the fixed rod 203 is fixedly connected to the inner shaft of the bearing 202, thereby enabling the reel 201 and the fixed rod 203 to rotate relative to each other, and one end of the fixed rod 203 is placed in the reel 201, and the other end of the fixed rod 203 passes through the bearing 202 and extends out of the reel 201.
[0039] When in use, when storing the fence net, the grip rod 102b-1 is placed vertically upward, the spring 102a-4 is adjusted to be in an extended state, and then one end of the fence net is hooked on the hook 204, and the other end of the fixed rod 203 is fixed to the ground. The operator rotates the grip rod 102b-1, and the rotation of the grip rod 102b-1 drives the reel 201 to rotate, and then the fence net is gradually wound on the reel 201. After the fence net is wound, the operator pulls the grip rod 102b-1 backward, and the grip rod 102b-1 moves backward to drive the sliding column 1 02a-1 moves backward, the sliding column 102a-1 moves backward and drives the locking column 102a-5 to move backward. At this time, the locking column 102a-5 moves from the straight groove 101b-5 to the arc groove 101b-4, and then the handle is twisted. The handle rotates downward and drives the sliding column 102a-1 to rotate. The rotation of the sliding column 102a-1 drives the locking column 102a-5 to slide in the arc groove 101b-4. When the handle is vertically downward, the handle is aligned with the horizontal groove 101b-3. At this time, the adjustment spring 102a-4 is reset and contracted, driving the sliding column 102a-1 moves forward, the sliding column 102a-1 moves forward to drive the handle to move forward, and then drives the arc pressure plate 102b-2 to move forward, the arc pressure plate 102b-2 moves forward to contact and squeeze the fence net wound on the reel 201, and the locking pin 102b-3 on the arc pressure plate 102b-2 extends into the gap on the fence net, further enhancing the contact between the arc pressure plate 102b-2 and the fence net, thereby better fixing the fence net, and facilitating the storage and transportation of the fence net; when the fence net needs to be arranged, the reverse operation is performed to pull Move the handle, and then rotate the handle from the vertical downward state to the vertical upward state. At this time, the locking column 102a-5 enters the straight groove 101b-5 under the action of the pulling force of the adjusting spring 102a-4, so that the grip 102b-1 is locked in the vertical upward state. At this time, rotate the grip 102b-1, thereby driving the reel 201 to rotate, and then the fence net on the reel 201 can be arranged; similarly, the operator can control the locking of the fence net of any length he needs to arrange by adjusting the state of the grip 102b-1.
[0040] In summary, through the cooperation of the adjustment component 101 and the locking component 102, it is beneficial to improve the efficiency of operators in arranging and storing fence nets, reduce the probability of violations caused by operators not performing fence arrangements due to "fear of trouble" psychology, and at the same time, the arrangement length of the fence net can be controlled during arrangement, and it can also be controlled after being stored on the reel 201 to prevent the fence net from spreading out and causing inconvenience.
[0041] Example 2
[0042] Reference Figures 1 to 8, which is the second embodiment of the utility model. Different from the previous embodiment, this embodiment provides another adjustment component 101, which solves the problem that when the fence net is too long and the width formed when it is wound on the reel 201 is large, the locking component 102 is not convenient for fixing the fence net. The adjustment member 101b also includes a plate groove 101b-6 opened on the adjustment column 101b-1, and a trapezoidal slider 101b-7 fixed in the plate groove 101b-6; the fixing member 101a also includes a plate 101a-3 fixedly connected to the fixing column 101a-1, and a trapezoidal groove 101a-4 opened on the plate 101a-3. The trapezoidal slider 101b-7 is placed in the trapezoidal groove 101a-4, the plate 101a-3 is placed in the plate groove 101b-6, one end of the trapezoidal groove 101a-4 is aligned with one end of the plate 101a-3, and the other end of the plate groove 101b-6 is a certain distance away from the other end of the plate 101a-3. The arrangement of the trapezoidal slider 101b-7 and the trapezoidal groove 101a-4 is conducive to preventing the adjustment column 101b-1 from detaching from the plate 101a-3.
[0043] Furthermore, the telescopic member 102a also includes a block 102a-6 fixedly connected to the sliding column 102a-1; the adjusting member 101b also includes a block groove 101b-8 opened on the side of the through groove 101b-2. The block 102a-6 is placed in the block groove 101b-8, and the shape of the block groove 101b-8 on the adjusting column 101b-1 corresponds to the running track of the sliding column 102a-1 on the adjusting column 101b-1. By placing the block 102a-6 in the block groove 101b-8, it is helpful to prevent the sliding column 102a-1 from separating from the adjusting column 101b-1; the trapezoidal slider 101b-7 and the trapezoidal groove 101a-4 are provided in multiple groups, which is helpful to increase the stability between the adjusting column 101b-1 and the plate 101a-3.
[0044] When in use, after a longer fence net is wound on the reel 201, the handle is vertically upward, and the operator pulls the handle outward, and the handle moves outward to drive the sliding column 102a-1 to move outward, and the sliding column 102a-1 moves outward to drive the locking column 102a-5 to move outward, and the locking column 102a-5 enters the arc groove 101b-4 and conflicts with the arc groove 101b-4, thereby driving the adjusting column 101b-1 to move outward, and then driving the trapezoidal slider 101b-7 to slide forward in the trapezoidal groove 101a-4, thereby increasing the adjustment The relative length of the joint assembly 101 is adjusted. When the relative length of the assembly 101 reaches the required length, the handle 102b-1 is rotated to drive the locking column 102a-5 to rotate in the arc groove 101b-4. At this time, the blocking block 102a-6 follows the rotation and sliding in the blocking groove 101b-8. When the handle 102b-1 is rotated to vertically downward, the sliding column 102a-1 is driven to move inward by the reset tension of the adjusting spring 102a-4, and enters to drive the arc pressure plate 102b-2 to contact the fence net. At this time, the locking of the longer fence net is completed.
[0045] Example 3
[0046] Reference Fig. 9 , which is the third embodiment of the utility model. Different from the previous embodiment, this embodiment provides a fence net rapid arrangement and storage device, which solves the problem that the fence net rapid arrangement and storage device is unstable when placed on the ground during arrangement and storage of the fence net, and includes the fixing mechanism in the above embodiment, including a support component 300; the support component 300 includes a bracket assembly 301, and a retracting assembly 302 arranged on the bracket assembly 301; and the rotating component 200 is connected to the support component 300. There are four groups of support components, which is conducive to enhancing the stability of the fence net rapid arrangement and storage device.
[0047] Furthermore, the support assembly 301 includes a support plate 301a, a pull groove 301b disposed on the support plate 301a, and a diagonal support surface 301c disposed at the bottom of the support plate 301a; the retracting assembly 302 includes a pull column 302a placed in the pull groove 301b, and a pull plate 302b fixedly connected to both ends of the pull column 302a. The support plate 301a is rotatably connected to the fixed rod 203, and the pull plate 302b is rotatably connected to the fixed rod 203. When the fixed rod 203 is placed on the ground, the diagonal support surface 301c is flush with the ground of the fixed rod 203, which is conducive to enhancing the supporting force of the fixed rod 203, thereby stabilizing the fixed rod 203, and thereby improving the stability of the fence net rapid arrangement and storage device when arranging and storing the fence net.
[0048] During use, when the fence net needs to be arranged and stored, the fixed rod 203 is fixed on the ground, and then the bracket is unfolded. The unfolding of the bracket drives the pulling column 302a to slide in the pulling groove 301b. When the pulling column 302a slides to the top of the pulling groove 301b, the diagonal support surface 301c is flush with the ground of the fixed rod 203, providing support force for the fixed rod 203, thereby enhancing the stability of the rapid arrangement and storage device of the fence net.
[0049] 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 ratio of various elements, and parameter values (e.g., temperature, pressure, etc.), installation 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 utility model. 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 of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.
[0050] Additionally, in order to provide a concise description of example 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.
[0051] 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.
[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A fixing mechanism, characterized in that: include, A driving component (100), and a rotating component (200) arranged on the driving component (100); The driving component (100) comprises an adjusting component (101) and a locking component (102) connected to the adjusting component (101).
2. The fixing mechanism according to claim 1, characterized in that: The adjustment component (101) comprises a fixing member (101a) and an adjustment member (101b) connected to the fixing member (101a); The fixing member (101a) comprises a fixing column (101a-1) and a front groove (101a-2) formed on the fixing column (101a-1).
3. The fixing mechanism according to claim 2, characterized in that: The adjusting member (101b) comprises an adjusting column (101b-1), a through groove (101b-2) provided on the adjusting column (101b-1), a transverse groove (101b-3) provided on the adjusting column (101b-1), an arc groove (101b-4) provided on the adjusting column (101b-1), and a straight groove (101b-5) provided on the adjusting column (101b-1).
4. The fixing mechanism according to claim 3, characterized in that: The locking assembly (102) comprises a telescopic member (102a) and a resisting member (102b) arranged on the telescopic member (102a); Wherein, the resisting member (102b) comprises a gripping rod (102b-1), an arc pressure plate (102b-2) fixedly connected to the gripping rod (102b-1), and a locking pin (102b-3) fixedly connected to the arc pressure plate (102b-2).
5. The fixing mechanism according to claim 4, characterized in that: The telescopic member (102a) comprises a sliding column (102a-1), an inner groove (102a-2) provided on the sliding column (102a-1), a rotating block (102a-3) rotatably connected to the inner groove (102a-2), an adjusting spring (102a-4) fixedly connected to the rotating block (102a-3), and a locking column (102a-5) fixed on the sliding column (102a-1).
6. The fixing mechanism according to claim 4 or 5, characterized in that: The rotating component (200) comprises a reel (201) fixedly connected to a fixed column (101a-1), a bearing (202) arranged at the bottom of the reel (201), a fixed rod (203) arranged on the bearing (202), and a hook (204) arranged on the outer wall of the reel (201).
7. The fixing mechanism according to claim 6, characterized in that: The adjusting member (101b) further comprises a plate groove (101b-6) formed on the adjusting column (101b-1), and a trapezoidal sliding block (101b-7) fixed in the plate groove (101b-6); The fixing member (101a) further comprises a plate (101a-3) fixedly connected to the fixing column (101a-1), and a trapezoidal groove (101a-4) provided on the plate (101a-3).
8. The fixing mechanism according to claim 7, characterized in that: The telescopic member (102a) further comprises a blocking block (102a-6) fixedly connected to the sliding column (102a-1); and the adjusting member (101b) further comprises a blocking groove (101b-8) provided on the side of the through groove (101b-2).
9. A fence net rapid arrangement and storage device, comprising the fixing mechanism according to any one of claims 1 to 8, characterized in that: and, a supporting member (300); The supporting component (300) comprises a support assembly (301) and a retracting assembly (302) arranged on the support assembly (301); The rotating component (200) is connected to the supporting component (300).
10. The fence net rapid arrangement and storage device according to claim 9, characterized in that: The support assembly (301) comprises a support plate (301a), a groove (301b) arranged on the support plate (301a), and a diagonal support surface (301c) arranged at the bottom of the support plate (301a); The retracting assembly (302) comprises a pulling column (302a) disposed in a pulling groove (301b) and pulling plates (302b) fixedly connected to both ends of the pulling column (302a).