A multifunctional cable winding device

Abstract

The present application relates to the technical field of cable winding devices, and discloses a multifunctional cable winding device, including a base, a cylindrical cavity with an opening on one side is opened on the upper part of the base, a support frame is rotatably connected to the inner wall of the cavity opening, a rotating shaft is passed through the center of the support frame and is rotatably connected, one end of the rotating shaft passes through the base and is fixedly connected to the output end of the power device, a plurality of arc plates are distributed around the outer side of the rotating shaft, and the central axis of the arc plate coincides with the central axis of the rotating shaft, a winding base surface for winding the cable is formed by a plurality of arc plates, and an unfolding device is arranged between the arc plate and the rotating shaft. Through the arrangement of the unfolding device, the arc plate, the push plate and the electric cylinder, the winding diameter and length of the winding device are adapted and changed according to the wire diameter during the actual use of the winding device, so as to improve the adaptability of the winding device to cables with different wire diameters.

Description

Technical Field

[0001] The invention relates to the technical field of cable winding devices, in particular to a multifunctional cable winding device. Background Art

[0002] In actual production or use, due to the long length of the cable, in order to facilitate the placement and transportation of the cable, the cable winding equipment is often used to wind the cable, so as to significantly reduce the space occupied by the cable. In actual use, since the winding reel is often used in conjunction with the cable, the two have a high degree of matching.

[0003] However, for manufacturers, the cable specifications they produce are diverse, and cables with different wire diameters have different requirements for the diameter of the innermost circle when winding. Especially for cables with larger wire diameters, if the diameter of the winding reel is too small, it is easy to cause the cable to bend too much during winding, causing damage. Moreover, during the winding process of larger cables, if the length of the winding reel is too short, the actual winding length of each layer after winding will be shorter, resulting in an increase in the number of winding layers, which is not conducive to the stability of the cable roll. At the same time, if the length of the winding reel does not match the cable diameter, it will also result in a reserved gap between each layer during the cable winding process, which will also make the actual winding length of each layer shorter and increase the number of winding layers. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a multifunctional cable winding device, which solves the problem that the winding diameter and length of the prior winding device are fixed and cannot be adjusted.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a multifunctional cable winding device, including a base, a cylindrical cavity with an opening on one side is opened on the upper part of the base, a support frame is rotatably connected to the inner wall of the cavity opening, a rotating shaft is passed through the center of the support frame and is rotatably connected, one end of the rotating shaft passes through the base and is fixedly connected to the output end of the power device, a plurality of arc plates are distributed around the outer side of the rotating shaft, and the central axis of the arc plate coincides with the central axis of the rotating shaft, and a winding base surface for winding up the cable is formed by the plurality of arc plates, and the arc An unfolding device is arranged between the plate and the rotating shaft. The arc-shaped plate is located inside the cavity and is slidably connected to a push plate at one end, and a foldable baffle is arranged at the other end. The push plate rotates synchronously with the arc-shaped plate with the rotating shaft as the center axis. An electric cylinder is also arranged in the cavity. When the electric cylinder drives the push plate to move toward the opening of the cavity, multiple arc-shaped plates are pushed by the push plate to move out of the cavity, and at the same time, they move synchronously away from the rotating shaft under the action of the unfolding device. When the electric cylinder drives the push plate to move in the opposite direction, multiple arc-shaped plates are pulled by the push plate to move into the cavity, and at the same time, they move synchronously close to the rotating shaft under the action of the unfolding device.

[0006] Preferably, a detection unit is provided on the top wall of the base, and the detection unit includes a fixed bracket, the bottom end of the fixed bracket is fixedly connected to the top wall of the base, the top end is fixedly connected to a lifting cylinder, the output end of the lifting cylinder is fixedly connected to a pressure beam, the pressure beam is slidably connected to a sliding rod, the bottom of the sliding rod is fixedly connected to the seat end of the pressure roller, and a spring is provided between the pressure beam and the seat end of the pressure roller, and the pressure roller is located directly above the arc plate, and is used to press the cable wound on the arc plate.

[0007] Preferably, a sliding rheostat is vertically fixedly connected to the side wall of the pressure beam, the sliding end of the sliding rheostat is fixedly connected to the seat end of the pressure roller, and the control unit determines the distance between the pressure roller and the pressure beam through the resistance variable of the sliding rheostat.

[0008] Preferably, a guide unit is provided on one side of the base, and the guide unit includes a base, an outer wall of the base is fixedly connected to the outer wall of the base, a linear electric slide is fixedly connected to the upper surface of the base, a guide frame is fixedly connected to the movable end of the linear electric slide, the guide frame is located on the cable input path, a guide cylinder is fixedly connected to the top of the guide frame, and the cable passes through the guide cylinder.

[0009] Preferably, a plurality of limit columns are symmetrically arranged around the inner wall of the guide cylinder, one end of the limit column is embedded in and slidably connected to the inner wall of the guide cylinder, a spring 2 is arranged between this end and the guide cylinder, and a ball is arranged at the other end.

[0010] Preferably, a plurality of fan-shaped openings corresponding to the arc-shaped plates are provided on the frame body of the support frame, and the arc-shaped plates pass through the fan-shaped openings.

[0011] Preferably, the middle part of the tail handle section of the baffle is rotatably connected to the end face of the arc plate, and the end is rotatably connected to the output end of the electric push rod. The outer wall of the electric push rod is fixedly connected to the inner wall of the arc plate, and the electric push rod drives the baffle to rotate, so that the baffle and the arc plate are switched between two states of being perpendicular and parallel to each other.

[0012] Preferably, the unfolding device includes a plurality of connecting rods corresponding to the arc-shaped plates, one end of the connecting rod is rotatably connected to the outer wall of the fixed ring, and the other end is rotatably connected to the inner wall of the arc-shaped plate corresponding thereto, the inner wall of the fixed ring is sleeved and fixedly connected to the outer wall of the rotating shaft, when the arc-shaped plate is pulled into the cavity by the push plate, the angle between the connecting rod and the rotating shaft gradually decreases, and the arc-shaped plate is pulled closer to the rotating shaft, when the arc-shaped plate is pushed out of the cavity by the push plate, the angle between the connecting rod and the rotating shaft gradually increases until they are perpendicular to each other, and the arc-shaped plate is pushed away from the rotating shaft to unfold.

[0013] Preferably, the unfolding device includes a conical block, which is sleeved and fixedly connected to the outer wall of the rotating shaft, and its tip faces the cavity, and a sliding groove corresponding to the arc plate is opened on the outer wall of the conical block, and a guide block is arranged between the conical block and the arc plate, one side of the guide block is fixedly connected to the inner wall of the arc plate, and the other side has the same slope as the outer wall of the conical block and fits each other, and is slidably connected to the sliding groove, when the arc plate is pulled into the cavity by the push plate, the guide block gradually moves toward the tip of the conical block and pulls the arc plate closer to the rotating shaft, and when the arc plate is pushed out of the cavity by the push plate, the guide block gradually moves toward the other end of the conical block and pushes the arc plate away from the rotating shaft to unfold.

[0014] The present invention provides a multifunctional cable winding device, which has the following beneficial effects:

[0015] The present invention arranges the unfolding device, the arc plate, the push plate and the electric cylinder so that in the actual use of the winding device, the push plate can be driven to move by the electric cylinder according to the wire diameter of the cable, thereby driving the arc plate to extend or retract into the cavity, while the unfolding device simultaneously unfolds or retracts the arc plate, so that the winding diameter and length of the winding device are adaptively changed according to the wire diameter, thereby improving the adaptability of the winding device to cables with different wire diameters, and avoiding the problem of cable damage or instability caused by the influence of the winding diameter and length. At the same time, since the changes of the electric cylinder and the unfolding device are both linear changes, the winding diameter and length formed by them are also adjusted linearly synchronously, thereby improving the accuracy of the adjustment, and achieving a denser adjustment range, further improving the adaptability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A front perspective view of a multifunctional cable winding device of the present invention;

[0017] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0018] Figure 3 A rear perspective view of a multifunctional cable winding device of the present invention;

[0019] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0020] Figure 5 It is a front view of a multifunctional cable winding device of the present invention;

[0021] Figure 6 It is a schematic diagram of the internal structure of the guide cylinder in the present invention;

[0022] Figure 7 It is a structural schematic diagram of the unfolding device in the first embodiment of the present invention;

[0023] Figure 8 It is a schematic diagram of the structure of the unfolding device in the second embodiment of the present invention.

[0024] Among them, 1. base; 101. cavity; 2. support frame; 3. rotating shaft; 4. arc plate; 401. fan-shaped opening; 5. push plate; 6. baffle; 7. electric cylinder; 8. fixed bracket; 9. lifting cylinder; 10. pressure beam; 11. slide rod; 12. pressure roller; 13. spring one; 14. sliding rheostat; 15. base; 16. linear electric slide rail; 17. guide frame; 18. guide cylinder; 19. limit column; 20. spring two; 21. ball; 22. electric push rod; 23. connecting rod; 24. fixing ring; 25. conical block; 26. guide block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1: Please refer to the attached Figure 1 -Attached Figure 7 The embodiment of the present invention provides a multifunctional cable winding device, including a base 1, a cylindrical cavity 101 with an opening on one side is opened on the upper part of the base 1, a support frame 2 is rotatably connected to the inner wall of the opening of the cavity 101, a rotating shaft 3 is passed through the center of the support frame 2 and is rotatably connected, one end of the rotating shaft 3 passes through the base 1 and is fixedly connected to the output end of the power device, a plurality of arc plates 4 are distributed around the outer side of the rotating shaft 3, and the central axis of the arc plate 4 coincides with the central axis of the rotating shaft 3, a winding base surface for winding the cable is formed by the plurality of arc plates 4, an unfolding device is arranged between the arc plate 4 and the rotating shaft 3, and the arc plate 4 is positioned at the bottom of the rotating shaft 3. A push plate 5 is slidably connected to one end of the cavity 101, and a foldable baffle 6 is provided at the other end. The push plate 5 rotates synchronously with the arc plate 4 with the rotating shaft 3 as the center axis. An electric cylinder 7 is also provided in the cavity 101. When the electric cylinder 7 drives the push plate 5 to move toward the opening of the cavity 101, multiple arc plates 4 are pushed by the push plate 5 to move out of the cavity 101, and at the same time, they move synchronously away from the rotating shaft 3 under the action of the unfolding device. When the electric cylinder 7 drives the push plate 5 to move in the opposite direction, multiple arc plates 4 are pulled by the push plate 5 to move into the cavity 101, and at the same time, they move synchronously close to the rotating shaft 3 under the action of the unfolding device.

[0027] It should be noted that the power device mostly adopts a combination of a servo motor and a reducer to achieve stability during the winding process.

[0028] There are many options for the position of the electric cylinder 7, and the position requirement is that the electric cylinder 7 can rotate synchronously with the push plate 5.

[0029] By setting up the unfolding device, the arc plate 4, the push plate 5 and the electric cylinder 7, during the actual use of the winding device, the push plate 5 can be driven to move by the electric cylinder 7 according to the wire diameter of the cable, thereby driving the arc plate 4 to extend or retract into the cavity 101, and the unfolding device simultaneously unfolds or retracts the arc plate 4, so that the winding diameter and length of the winding device are adaptively changed according to the wire diameter, thereby improving the adaptability of the winding device to cables with different wire diameters, and avoiding the problem of cable damage or instability caused by the influence of the winding diameter and length. At the same time, since the changes of the electric cylinder 7 and the unfolding device are both linear changes, the winding diameter and length formed by them are also adjusted linearly synchronously, thereby improving the accuracy of the adjustment, and achieving a denser adjustment range, further improving the adaptability of the device.

[0030] The top wall of the base 1 is provided with a detection unit, which includes a fixed bracket 8, the bottom end of the fixed bracket 8 is fixedly connected to the top wall of the base 1, the top end is fixedly connected to a lifting cylinder 9, the output end of the lifting cylinder 9 is fixedly connected to a pressure beam 10, the pressure beam 10 is slidably connected to a slide bar 11, the bottom of the slide bar 11 is fixedly connected to the seat end of the pressure roller 12, and a spring 13 is provided between the pressure beam 10 and the seat end of the pressure roller 12, and the pressure roller 12 is located directly above the arc plate 4, which is used to press the cable wound on the arc plate 4. The side wall of the pressure beam 10 is vertically fixedly connected with a sliding rheostat 14, the sliding end of the sliding rheostat 14 is fixedly connected to the seat end of the pressure roller 12, and the control unit judges the distance between the pressure roller 12 and the pressure beam 10 through the resistance variable of the sliding rheostat 14.

[0031] The detection unit is used to suppress the wound cable to maintain the tightness of the cable roll on the one hand, and to monitor the diameter of the cable roll on the other hand to achieve the purpose of automatic shutdown when the winding size is reached. The above-mentioned effect is mainly achieved through the detection unit. The lifting cylinder 9 drives the pressure beam 10 to descend, and then drives the pressure roller 12 to descend. Under the action of the spring 13, the cable roll is compressed. At the same time, in actual operation, the stroke of the spring 13 is the retreat space of the pressure roller 12. At the beginning of winding, the lifting cylinder 9 descends to the preset lowest position. With the gradual increase in the diameter of the cable roll, when the retreat space of the pressure roller 12 is insufficient, the lifting cylinder 9 rises to a certain preset height. At this time, the pressure roller 12 still has a compression effect on the cable roll under the action of the spring 13, and the judgment principle of the retreat space is that the sliding end of the sliding rheostat 14 moves synchronously with the pressure roller 12, then the resistance variable of the sliding rheostat 14 is proportional to the distance variable between the breaking pressure roller 12 and the pressure beam 10, then the rising height of the breaking pressure roller 12 can be calculated according to the control unit, and the timing of the lifting of the lifting cylinder 9 is determined. In this way, when the rising height of the pressure roller 12 reaches the preset value of the cable roll, the equipment can be controlled to stop the winding operation.

[0032] A guide unit is provided on one side of the base 1, and the guide unit includes a base 15, the outer wall of the base 15 is fixedly connected to the outer wall of the base 1, a linear electric slide rail 16 is fixedly connected to the upper surface of the base 15, and a guide frame 17 is fixedly connected to the movable end of the linear electric slide rail 16, and the guide frame 17 is located on the cable input path, and a guide cylinder 18 is fixedly connected to the top of the guide frame 17, and the cable passes through the guide cylinder 18. A plurality of limit columns 19 are symmetrically arranged around the inner wall of the guide cylinder 18, and one end of the limit column 19 is embedded and slidably connected to the inner wall of the guide cylinder 18, and a spring 20 is arranged between this end and the guide cylinder 18, and a ball 21 is arranged at the other end.

[0033] The guide unit is used to control the cable introduction trajectory. The cable passes through the guide cylinder 18, and the linear electric slide 16 drives the guide frame 17 to move back and forth, thereby driving the cable in the limit column 19 to move back and forth within the length of the arc plate 4 during the winding process, that is, the actual length of the winding disk, so as to achieve a uniform winding effect. At the same time, the driving range of the linear electric slide 16 is adjusted according to the expansion and contraction amount feedback by the electric cylinder 7 after calculation by the control unit.

[0034] The support frame 2 is provided with a plurality of fan-shaped openings 401 corresponding to the arc-shaped plate 4, and the arc-shaped plate 4 passes through the fan-shaped openings 401. The middle portion of the tail handle section of the baffle 6 is rotatably connected to the end surface of the arc-shaped plate 4, and the end portion is rotatably connected to the output end of the electric push rod 22. The outer wall of the electric push rod 22 is fixedly connected to the inner wall of the arc-shaped plate 4. The electric push rod 22 drives the baffle 6 to rotate, so that the baffle 6 and the arc-shaped plate 4 are switched between two states of being perpendicular and parallel to each other.

[0035] In the actual production process, in order to ensure the stability of the cable after winding, it is often necessary to set a winding drum on the winding part of the winding device so that the cable is finally wound on the winding drum for subsequent packaging. Through the setting of the baffle 6, the electric push rod 22 pulls the baffle 6 to rotate to be parallel to the arc plate 4, and then the winding drum can be set on the outer wall of the arc plate 4. When the winding starts, the electric push rod 22 pushes the baffle 6 to rotate to be perpendicular to the arc plate 4 to limit the winding drum, and also to limit the winding cross section of the wound cable. At the same time, because the arc plate 4 actually realizes the internal expansion fixation of the winding drum under the action of the unfolding device, the winding drum is fixed during winding, and the arc plate 4 is retracted after winding so that the winding drum can be quickly removed.

[0036] The unfolding device includes a plurality of connecting rods 23 corresponding to the arc-shaped plate 4, one end of the connecting rod 23 is rotatably connected to the outer wall of the fixing ring 24, and the other end is rotatably connected to the inner wall of the corresponding arc-shaped plate 4, the inner wall of the fixing ring 24 is sleeved and fixedly connected to the outer wall of the rotating shaft 3, when the arc-shaped plate 4 is pulled by the push plate 5 to move into the cavity 101, the angle between the connecting rod 23 and the rotating shaft 3 gradually decreases, and the arc-shaped plate 4 is pulled closer to the rotating shaft 3, when the arc-shaped plate 4 is pushed by the push plate 5 to move out of the cavity 101, the angle between the connecting rod 23 and the rotating shaft 3 gradually increases until they are perpendicular to each other, and the arc-shaped plate 4 is pushed away from the rotating shaft 3 to unfold.

[0037] Example 2: Please refer to the attached Figure 8 Based on the above embodiment, this embodiment provides another structure of the deployment device, namely:

[0038] The unfolding device includes a conical block 25, which is sleeved and fixedly connected to the outer wall of the rotating shaft 3, and its tip faces the cavity 101. A sliding groove corresponding to the arc plate 4 is opened on the outer wall of the conical block 25, and a guide block 26 is arranged between the conical block 25 and the arc plate 4. One side of the guide block 26 is fixedly connected to the inner wall of the arc plate 4, and the other side has the same slope as the outer wall of the conical block 25 and fits each other, and is slidably connected to the sliding groove. When the arc plate 4 is pulled by the push plate 5 to move into the cavity 101, the guide block 26 gradually moves toward the tip of the conical block 25 and pulls the arc plate 4 to move closer to the rotating shaft 3. When the arc plate 4 is pushed by the push plate 5 to move out of the cavity 101, the guide block 26 gradually moves to the other end of the conical block 25 and pushes the arc plate 4 away from the rotating shaft 3 to unfold.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional cable winding device, comprising a base (1), characterized in that: A cylindrical cavity (101) with an opening on one side is provided on the upper part of the base (1); a support frame (2) is rotatably connected to the inner wall of the opening of the cavity (101); a rotating shaft (3) is passed through the center of the support frame (2) and is rotatably connected; one end of the rotating shaft (3) passes through the base (1) and is fixedly connected to the output end of the power device; a plurality of arc plates (4) are distributed around the outer side of the rotating shaft (3); the central axis of the arc plate (4) coincides with the central axis of the rotating shaft (3); a winding base surface for winding the cable is formed by the plurality of arc plates (4); an unfolding device is provided between the arc plate (4) and the rotating shaft (3); one end of the arc plate (4) located inside the cavity (101) is slidably connected to a push plate (5); the other end of the arc plate (4) is slidably connected to a push plate (5) A foldable baffle (6) is provided at one end, the center of the push plate (5) is sleeved and slidably connected to the outer wall of the rotating shaft (3), and the push plate (5) rotates synchronously with the arc plate (4) with the rotating shaft (3) as the center axis. An electric cylinder (7) is also provided in the cavity (101). When the electric cylinder (7) drives the push plate (5) to move toward the opening of the cavity (101), the plurality of arc plates (4) are pushed by the push plate (5) to move outside the cavity (101), and at the same time, they move synchronously away from the rotating shaft (3) under the action of the unfolding device. When the electric cylinder (7) drives the push plate (5) to move in the opposite direction, the plurality of arc plates (4) are pulled by the push plate (5) to move into the cavity (101), and at the same time, they move synchronously close to the rotating shaft (3) under the action of the unfolding device. The top wall of the base (1) is provided with a detection unit, and the detection unit comprises a fixed bracket (8), the bottom end of the fixed bracket (8) is fixedly connected to the top wall of the base (1), and the top end is fixedly connected to a lifting cylinder (9), the output end of the lifting cylinder (9) is fixedly connected to a pressure beam (10), the pressure beam (10) is slidably connected to a slide rod (11), the bottom of the slide rod (11) is fixedly connected to the seat end of a pressure roller (12), and a spring (13) is provided between the pressure beam (10) and the seat end of the pressure roller (12), and the pressure roller (12) is located directly above the arc plate (4) and is used to press the cable wound on the arc plate (4); A sliding rheostat (14) is vertically fixedly connected to the side wall of the pressure beam (10), the sliding end of the sliding rheostat (14) is fixedly connected to the seat end of the pressure roller (12), and the control unit determines the distance between the pressure roller (12) and the pressure beam (10) through the resistance value variable of the sliding rheostat (14); A guide unit is provided on one side of the base (1), the guide unit comprising a base (15), the outer wall of the base (15) being fixedly connected to the outer wall of the base (1), the upper surface of the base (15) being fixedly connected to a linear electric slide rail (16), the movable end of the linear electric slide rail (16) being fixedly connected to a guide frame (17), the guide frame (17) being located on a cable input path, the top end of the guide frame (17) being fixedly connected to a guide cylinder (18), and the cable passing through the guide cylinder (18).

2. A multifunctional cable winding device according to claim 1, characterized in that: A plurality of limit posts (19) are symmetrically arranged around the inner wall of the guide cylinder (18), one end of the limit post (19) is embedded in and slidably connected to the inner wall of the guide cylinder (18), a spring 2 (20) is arranged between the end and the guide cylinder (18), and a ball (21) is arranged at the other end.

3. The multifunctional cable winding device according to claim 1, characterized in that: The support frame (2) is provided with a plurality of fan-shaped openings (401) corresponding to the arc-shaped plates (4), and the arc-shaped plates (4) pass through the fan-shaped openings (401).

4. The multifunctional cable winding device according to claim 1, characterized in that: The middle portion of the tail handle section of the baffle (6) is rotatably connected to the end surface of the arc-shaped plate (4), and the end portion is rotatably connected to the output end of the electric push rod (22). The outer wall of the electric push rod (22) is fixedly connected to the inner wall of the arc-shaped plate (4). The electric push rod (22) drives the baffle (6) to rotate, so that the baffle (6) and the arc-shaped plate (4) are switched between two states of being perpendicular to each other and being parallel to each other.

5. The multifunctional cable winding device according to claim 1, characterized in that: The unfolding device comprises a plurality of connecting rods (23) corresponding to the arc-shaped plates (4); one end of the connecting rod (23) is rotatably connected to the outer wall of the fixing ring (24), and the other end is rotatably connected to the inner wall of the corresponding arc-shaped plates (4); the inner wall of the fixing ring (24) is sleeved and fixedly connected to the outer wall of the rotating shaft (3); when the arc-shaped plates (4) are pulled by the push plate (5) to move into the cavity (101), the angle between the connecting rod (23) and the rotating shaft (3) gradually decreases, and the arc-shaped plates (4) are pulled closer to the rotating shaft (3); when the arc-shaped plates (4) are pushed by the push plate (5) to move out of the cavity (101), the angle between the connecting rod (23) and the rotating shaft (3) gradually increases until they are perpendicular to each other, and the arc-shaped plates (4) are pushed away from the rotating shaft (3) to unfold.

6. The multifunctional cable winding device according to claim 1, characterized in that: The unfolding device comprises a conical block (25), the conical block (25) being sleeved and fixedly connected to the outer wall of the rotating shaft (3), with its tip facing the cavity (101), the outer wall of the conical block (25) being provided with a slide groove corresponding to the arc plate (4), a guide block (26) being provided between the conical block (25) and the arc plate (4), one side of the guide block (26) being fixedly connected to the inner wall of the arc plate (4), and the other side having the same slope as the outer wall of the conical block (25). The two guide blocks (26) are fitted to each other and are slidably connected with the slide groove. When the arc plate (4) is pulled by the push plate (5) to move into the cavity (101), the guide block (26) gradually moves toward the tip of the conical block (25) and pulls the arc plate (4) toward the rotating shaft (3). When the arc plate (4) is pushed by the push plate (5) to move out of the cavity (101), the guide block (26) gradually moves toward the other end of the conical block (25) and pushes the arc plate (4) away from the rotating shaft (3) to unfold.

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