A device for repairing damaged power cables

Abstract

The present invention relates to the field of cable repair technology, and in particular to a device for repairing damaged power cables, comprising a movable winding component and two clamp components symmetrically arranged therewith, wherein the clamp component comprises a hinged ring and a plurality of extrusion plates located inside the hinged ring. The device is installed on the cable by installing the clamp components at positions at a certain distance at both ends of the damaged part of the cable, and then the screw is rotated to drive the movable ring to move along the cable, so that the tape installed on the movable ring is gradually wound forward on the damaged cable. At the same time, during the movement of the movable ring, the mounting seat also rotates around the cable as it moves forward, and is used to wrap the tape around the outer wall of the broken cable. While the tape is being wound, the turntable also actively rotates to gradually release the tape, and in conjunction with the winding of the tape, standard and rapid winding of the outer wall of the damaged cable is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable repair, and in particular to a device for repairing damaged power cables. Background Art

[0002] In the field of cable repair technology in recent years, the existing conventional operation methods mainly rely on manual implementation. When the cable is damaged, the staff usually use a special knife to accurately peel off the cable sheath at the damaged part to expose the internal battery structure for detailed inspection. This step is to confirm whether the battery cell has also been damaged; if the battery cell is still intact, the damaged section of the peeled cable sheath needs to be cut off.

[0003] Subsequent processes involve fine grinding and deep cleaning of the cut surface to ensure that its surface is flat and free of impurities, providing a good basic condition for subsequent packaging work. Then, the cut part is manually wrapped with multiple layers of tape and other materials. In this process, in order to ensure sealing and stability, the staff needs to apply a certain amount of stretching force to the tape to enhance its fastening effect.

[0004] However, the existing manual winding method has significant problems and challenges. Since it relies entirely on manual operation, it is difficult to standardize the force control, number of turns calculation and overall uniformity during the winding process, which often leads to uneven quality of the winding package, which is neither stable nor able to meet high standards of electrical performance requirements. At the same time, excessive manual labor intensity and low efficiency also limit the improvement of cable repair work efficiency and quality consistency, which undoubtedly puts forward new technical improvement needs for the development of the power facility maintenance industry. Therefore, in response to the above problems, it is urgent to develop a more scientific, efficient and stable cable repair technology solution to replace the existing manual winding method that relies on manual labor, so as to realize the automation, standardization and efficiency of the cable repair process. Summary of the invention

[0005] In view of the above problems existing in the existing power cable damage repair device, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a power cable damage repair device, the purpose of which is to develop a more scientific, efficient and stable cable repair technical solution to replace the existing manual winding method that relies on manpower.

[0007] In order to solve the above technical problems, the present invention provides the following technical solution: comprising a moving winding component and two clamp components symmetrically arranged therewith,

[0008] The clamp component includes a hinge ring and a plurality of extrusion plates located inside the hinge ring.

[0009] The movable winding component comprises a connecting rod and a screw rod of two clamp components, a movable ring is arranged along the connecting rod and the screw rod, a coil piece is arranged inside the movable ring, and a mounting piece for mounting the tape is arranged on the side of the coil piece.

[0010] As a preferred solution of the power cable damage repair device described in the present invention, the movable ring includes an upper ring body and a lower ring body which are plugged into each other, and the outer wall of the upper ring body is provided with a nut threadedly connected to the screw rod, and the outer wall of the lower ring body is provided with a first ring which is sleeved with the connecting rod.

[0011] As a preferred solution of the power cable damage repairing device of the present invention, a first ring groove is provided on the inner wall of the movable ring, and two semicircular tooth rings supporting each other are slidably arranged in the first ring groove.

[0012] As a preferred solution of the power cable damage repair device of the present invention, a limiting groove is arranged on the screw rod, a first gear is slidably arranged along the limiting groove, and a second gear is arranged between the first gear and the semicircular gear ring.

[0013] As a preferred solution of the power cable damage repair device described in the present invention, the inner wall of the movable ring is also provided with a second ring groove, and a mounting seat for the winding member is slidably arranged inside the second ring groove, and the arc-shaped mounting seat is fixed to the side surface of one of the semicircular tooth rings through a plurality of connecting rods.

[0014] As a preferred solution of the power cable damage repair device described in the present invention, a rotating shaft is rotatably arranged in the mounting seat, one end of the rotating shaft located in the mounting seat is connected to the third gear through a belt drive, and the inner wall of the second ring groove is provided with ring teeth, and the third gear is meshed with the ring teeth.

[0015] As a preferred solution of the power cable damage repair device described in the present invention, the outer end of the rotating shaft is fixedly connected to the mounting member, and the mounting member includes a turntable, and the turntable is provided with strip grooves at equal intervals, and a pushing plate is slidably arranged in each of the strip grooves, and the multiple pushing plates are used to support and fix the center circle of the tape, and the strip groove also accommodates a first spring for pushing the pushing plate outward.

[0016] As a preferred solution of the power cable damage repair device of the present invention, the hinged ring is composed of two semicircular rings hinged to each other, one end of which is hinged to each other and the other end is clamped, and each of the semicircular rings is equipped with two symmetrical extrusion plates.

[0017] As a preferred solution of the power cable damage repair device of the present invention, the outer wall of each of the semicircular rings is provided with a second ring for sleeve-mounting the screw rod or the connecting rod, and handles are provided at both ends of the screw rod.

[0018] As a preferred solution of the power cable damage repair device described in the present invention, wherein: two symmetrical holes are opened on the semicircular ring, the straight rod of the extrusion plate moves along the holes, and one end of the straight rod is fixedly connected to the extrusion plate, and a limit plate is arranged at the other end, and a second spring for pushing the extrusion plate to close inward is sleeved on the outer wall of the straight rod.

[0019] The beneficial effects of the present invention are as follows: by installing the clamp components at positions with a certain spacing at both ends of the damaged cable, the device is installed on the cable, and then the screw is rotated to drive the movable ring to move along the cable, so that the tape installed on the movable ring is gradually wound forward on the damaged cable. At the same time, during the movement of the movable ring, the mounting seat also rotates around the cable as it moves forward, so as to wrap the tape around the outer wall of the broken cable. While the tape is being wound, the turntable also actively rotates to gradually release the tape, and in conjunction with the winding of the tape, standard and rapid winding of the outer wall of the damaged cable is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall installation structure of the power cable damage repair device of the present invention.

[0022] Figure 2 It is a schematic diagram of the overall structure of the power cable damage repair device of the present invention.

[0023] Figure 3 The figure is a schematic diagram of the structure of the clamp components of the power cable damage repair device of the present invention.

[0024] Figure 4 The structure of the mobile winding component of the power cable damage repair device of the present invention is schematically shown. Figure 1 .

[0025] Figure 5 The structure of the mobile winding component of the power cable damage repair device of the present invention is schematically shown. Figure 2 .

[0026] Figure 6It is a schematic diagram of the cross-sectional structure of the moving winding component of the power cable damage repair device of the present invention.

[0027] Figure 7 for Figure 6 A schematic diagram of the enlarged structure in the middle.

[0028] In the figure:

[0029] 100, movable winding component; 101, connecting rod; 102, screw rod; 102a, limiting groove; 102b, handle; 103, movable ring; 103a, upper ring body; 103b, lower ring body; 103c, nut; 103d, first sleeve ring; 103e, first ring groove; 103f, semicircular gear ring; 103g, first gear; 103h, second gear; 103i, second ring groove; 103j, ring gear; 104, winding member; 104a, mounting seat; 104b, connecting rod; 104c, rotating shaft; 104d, belt; 104e, third gear; 105, mounting member; 105a, rotating disk; 105b, strip groove; 105c, pushing plate; 105d, first spring;

[0030] 200, clamp component; 201, hinged ring; 201a, semicircular ring; 201b, second ring; 201c, hole; 202, extrusion plate; 202a, straight rod; 202b, limit plate; 202c, second spring. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, 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.

[0032] 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.

[0033] 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.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, 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.

[0035] Example 1

[0036] Reference Figure 1-Figure 2 , which is the first embodiment of the present invention, provides a power cable damage repair device, including a movable winding component 100 and two clamp components 200 symmetrically arranged therewith, the clamp component 200 including a hinge ring 201 and a plurality of extrusion plates 202 located inside the hinge ring 201, the movable winding component 100 includes a connecting rod 101 and a screw rod 102 of two clamp components 200, a movable ring 103 is arranged along the connecting rod 101 and the screw rod 102, a coil piece 104 is arranged inside the movable ring 103, and a mounting piece 105 for mounting a tape is arranged on the side of the coil piece 104.

[0037] In this embodiment, the clamp component 200 is installed at a certain distance at both ends of the damaged part of the cable, and the device is installed on the cable. Then, the screw 102 is rotated to drive the movable ring 103 to move along the cable, and the tape installed on the movable ring 103 is gradually wound forward on the damaged cable. At the same time, during the movement of the movable ring 103, the mounting seat 104a also rotates around the cable as it moves forward, and is used to wrap the tape around the outer wall of the broken cable. While the tape is being wound, the turntable 105a also actively rotates to gradually release the tape. In conjunction with the winding of the tape, an efficient and stable cable repair technical solution is provided, which replaces the existing manual winding method that relies on manual labor, and realizes the automation, standardization and efficiency of the cable repair process.

[0038] Example 2

[0039] Reference Figure 1-Figure 5 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the hinged ring 201 is composed of two semicircular rings 201a hinged to each other, one end of which is hinged to each other and the other end is clamped. The outer wall of each semicircular ring 201a is provided with a second sleeve ring 201b for sleeve screw 102 or connecting rod 101. The movable ring 103 includes an upper ring body 103a and a lower ring body 103b that are plugged into each other. In this application, there is no specific limitation on the clamping method, which only needs to meet the needs.

[0040] It should be noted that according to the regulations for repairing damaged cables, a certain length needs to be left at both ends of the damaged part before wrapping the tape to ensure the safety of the cable after repair. This length needs to be manually felt or measured each time and is difficult to control. The length of the screw 102 and the connecting rod 101 of the present application is the set length, so that only the device needs to be installed on the cable to ensure that the winding meets the standard. A clamp component 200 is set at both ends of the screw 102 and the connecting rod 101 for installing the device on the cable, and the screw 102 and the connecting rod 101 are set up to form a guide rail for the movement of the moving ring 103 for wrapping the tape.

[0041] Two symmetrical extrusion plates 202 are installed on each semicircular ring 201a, and two symmetrical holes 201c are opened on the semicircular ring 201a. The straight rod 202a of the extrusion plate 202 moves along the hole 201c, and one end of the straight rod 202a is fixedly connected to the extrusion plate 202, and a limit plate 202b is set at the other end, and a second spring 202c for pushing the extrusion plate 202 to close inward is sleeved on the outer wall of the straight rod 202a.

[0042] In this embodiment, when installing the device to a damaged cable, firstly, the two clamp components 200 are used as the midpoint of the damaged part of the cable, and the two sides are equidistant as the clamping points. When clamping, the hinge ring 201 is opened, and the two semicircular rings 201a are rotated and opened with the hinge point as the axis, and the clamping point of the cable is wrapped and clamped, and then the cable is clamped again by closing and clamping. During the wrapping and clamping process, each extrusion plate 202 located on the two semicircular rings 201a first fits the outer wall of the cable, and as the semicircular rings 201a are closed, the second spring 202c inside is squeezed until the semicircular rings 201a are completely closed. When the clamping component is clamping, the upper ring body 103a and the lower ring body 103b of the movable winding component 100 also fit the outer wall of the cable to be locked with each other, so as to realize the installation of the cable in the device.

[0043] The remaining structures are the same as those of Example 1.

[0044] Example 3

[0045] Reference Figure 4-Figure 7 , which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that the moving ring 103 includes an upper ring body 103a and a lower ring body 103b which are plugged into each other, and the outer wall of the upper ring body 103a is provided with a nut 103c which is threadedly connected to the screw rod 102, and the outer wall of the lower ring body 103b is provided with a first sleeve ring 103d which is sleeved with the connecting rod 101. Both ends of the screw rod 102 are provided with handles 102b.

[0046] It should be noted that the screw rod 102 can be driven to rotate by rotating the handle 102b at either end, and the rotation of the screw rod 102 drives the nut 103c to rotate as well. The rotation of the nut 103c drives the upper ring body 103a fixed thereto to move. Since the upper ring body 103a and the lower ring body 103b are plugged in, the upper ring body 103a drives the lower ring body 103b to move along the connecting rod 101 with the first ring 103d, thereby realizing the movement and adjustment of the position of the movable ring 103, and further realizing the method of gradually moving the tape forward and winding it.

[0047] The inner wall of the moving ring 103 is provided with a first annular groove 103e, and two semicircular toothed rings 103f are slidably arranged in the first annular groove 103e and abut against each other. The screw rod 102 is provided with a limiting groove 102a, and a first gear 103g is slidably arranged along the limiting groove 102a, and a second gear 103h is arranged between the first gear 103g and the semicircular toothed ring 103f. The inner wall of the moving ring 103 is also provided with a second annular groove 103i, and a mounting seat 104a of the coil member 104 is slidably arranged in the second annular groove 103i, and the arc-shaped mounting seat 104a is fixed to the side surface of one of the semicircular toothed rings 103f through a plurality of connecting rods 104b. A rotating shaft 104c is rotatably arranged in the mounting seat 104a. One end of the rotating shaft 104c located in the mounting seat 104a is connected to the third gear 104e through a belt 104d. A ring tooth 103j is arranged on the inner wall of the second annular groove 103i. The third gear 104e meshes with the ring tooth 103j. The outer end of the rotating shaft 104c is fixedly connected to a mounting member 105.

[0048] It should be noted that, since the movable ring 103 is composed of an upper ring body 103a and a lower ring body 103b which are plugged into each other, the first ring groove 103e is also divided into two parts, the semicircular toothed ring 103f which is arranged to slide along the first ring groove 103e is also divided into two parts, and they form a complete circular ring with each other. The two semicircular toothed rings 103f abut against each other, and the upper ring body 103a and the lower ring body 103b can be plugged into the complete movable ring 103, and the semicircular toothed ring 103f can also be formed inside the complete movable ring 103, so as to cooperate with the second gear 103h to rotate with the first gear 103g. When the movable ring 103 is at the starting position, the cross-section of the semicircular toothed ring 103f is flush with the cross-section of the movable ring 103, so that the movable ring 103 and the semicircular toothed ring 103f inside it can be disassembled and assembled into two complete and independent parts. The cross sections of the semicircular gear ring 103f and the first ring groove 103e are both set to T-shape, so that the semicircular gear ring 103f will not fall from the first ring groove 103e, and teeth are set on the outer wall of the semicircular gear ring 103f for meshing with the second gear 103h.

[0049] It should also be noted that the mounting seat 104a is in the shape of a small section of a semicircular toothed ring 103f, but its outer wall is not provided with teeth. The mounting seat 104a is fixed to any end face of the semicircular toothed ring 103f through a plurality of parallel connecting rods 104b, so that when the semicircular toothed ring 103f rotates, the mounting seat 104a will be driven to rotate in the second ring groove 103i through the connecting rod 104b. The mounting seat 104a is provided with a cavity inside, and the rotating shaft 104c and the third gear 104e are both installed in the internal cavity through bearings. The rotating shaft 104c and the third gear 104e are driven by a belt 104d. When the mounting seat 104a is driven to rotate, the third gear 104e inside it will mesh and roll with the ring teeth 103j in the second ring groove 103i, and the rotating shaft 104c will also rotate with it, thereby driving the tape installed on the mounting member 105 to be slowly released.

[0050] The mounting member 105 includes a rotating disk 105a, on which strip grooves 105b are provided at equal intervals, and a pushing plate 105c is slidably provided in each strip groove 105b, and the plurality of pushing plates 105c are used to support and fix the center ring of the adhesive tape, and the strip groove 105b also contains a first spring 105d for pushing the pushing plates 105c outward. Specifically, by folding each pushing plate 105c, and then putting the center ring of the adhesive tape on it and releasing the hand, each pushing plate 105c moves outward under the action of the internal first spring 105d, and the adhesive tape is fixed, thereby ensuring the firm installation of the adhesive tape, and providing a basis for subsequent pulling of the adhesive tape and driving the adhesive tape to be wound.

[0051] In summary, the reason for fixing the tape on the turntable 105a and actively controlling the turntable 105a to rotate, thereby slowly releasing the tape, instead of putting the tape on the turntable 105a and automatically stretching and releasing it by traction as the mounting seat 104a rotates, is because the automatic stretching and releasing by traction has a certain degree of uncontrollability, which may easily lead to the tape being unable to be pulled out or the tape being broken, and on the other hand, the automatic stretching and releasing by traction cannot control the deformation degree of the tape during pulling, and cannot ensure that the tape can meet the standards for cable stretching deformation.

[0052] When in use, by shaking the handle 102b, the handle 102b drives the screw 102 to rotate, and the screw 102 drives the moving ring 103 equipped with the nut 103c to move along the connecting rod 101 and the screw 102 from one clamp component 200 to the other clamp component 200. Since the limiting groove 102a is provided on the screw 102, it also drives the first gear 103g sleeved on its outer wall to move and rotate. The rotation of the first gear 103g drives the second gear 103h meshing with it to rotate, and the second gear 103h drives the semicircular gear ring 103f to rotate in the first ring groove 103e. The rotation of the semicircular gear ring 103f drives the mounting seat 104a to move along the second ring groove 103i through the multi-connecting rod 104b. The third gear 104e in the mounting seat 104a is aligned with the second ring groove 103 The ring teeth 103j inside i are meshed, so that the third gear 104e also rotates, and the rotation of the third gear 104e rotates the rotating shaft 104c connected to the belt 104d. The rotation of the rotating shaft 104c drives the turntable 105a to rotate, thereby driving the tape installed on the turntable 105a to rotate, so that the tape is slowly released, and it is realized while moving and circling around the cable. The tape is rotated to release the tape, and multiple turns of winding are achieved on the damaged part of the cable, and the cable is quickly and standardly wrapped. After that, after cutting the tape, it is rotated in the opposite direction to move it to the origin, and the tape is pulled again to adhere one end of it to the outer wall of the cable, and the outer wall of the cable is wrapped again. At the same time, it is not only used for winding tapes, but also can be used for other cable repairs such as gauze or other winding parts.

[0053] The remaining structure is the same as that of Example 2.

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

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

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A power cable damage repair device, characterized in that: The invention comprises a movable winding component (100) and two clamp components (200) symmetrically arranged therewith, wherein the clamp component (200) comprises a hinged ring (201) and a plurality of extrusion plates (202) located inside the hinged ring (201), the movable winding component (100) comprises two connecting rods (101) and a screw rod (102) of the clamp components (200), a movable ring (103) is arranged along the connecting rod (101) and the screw rod (102), a coil piece (104) is arranged inside the movable ring (103), a mounting piece (105) for mounting an adhesive tape is arranged on the side of the coil piece (104), and the movable ring (103) comprises An upper ring body (103a) and a lower ring body (103b) are plugged into each other, and the outer wall of the upper ring body (103a) is provided with a nut (103c) threadedly connected to the screw rod (102), and the outer wall of the lower ring body (103b) is provided with a first sleeve ring (103d) sleeved with the connecting rod (101), and the inner wall of the movable ring (103) is provided with a first ring groove (103e), and two semicircular toothed rings (103f) that abut against each other are slidably arranged in the first ring groove (103e), and a limiting groove (102a) is provided on the screw rod (102), and a first gear (103g) is slidably arranged along the limiting groove (102a), and the first gear (103g) is slidably arranged on the first gear (103e). A second gear (103h) is arranged between the movable ring (103) and the semicircular gear ring (103f); a second ring groove (103i) is also provided on the inner wall of the movable ring (103); a mounting seat (104a) of the coil member (104) is slidably arranged inside the second ring groove (103i); the arc-shaped mounting seat (104a) is fixed to the side surface of one of the semicircular gear rings (103f) by a plurality of connecting rods (104b); a rotating shaft (104c) is rotatably arranged inside the mounting seat (104a); one end of the rotating shaft (104c) located inside the mounting seat (104a) is connected to the third gear (104e) through a belt (104d); The inner wall of the second annular groove (103i) is provided with an annular tooth (103j), the third gear (104e) meshes with the annular tooth (103j), the outer end of the rotating shaft (104c) is fixedly connected with the mounting member (105), the mounting member (105) comprises a rotating disk (105a), the rotating disk (105a) is provided with strip grooves (105b) at equal intervals, a pushing plate (105c) is slidably arranged in each of the strip grooves (105b), the plurality of pushing plates (105c) are used to support and fix the center ring of the adhesive tape, and the strip groove (105b) also accommodates a first spring (105d) for pushing the pushing plate (105c) outward.

2. The power cable damage repair device according to claim 1, characterized in that: The hinged ring (201) is composed of two semicircular rings (201a) hinged to each other, one end of which is hinged to each other and the other end is clamped, and each of the semicircular rings (201a) is mounted with two symmetrical extrusion plates (202).

3. The power cable damage repair device according to claim 2, characterized in that: The outer wall of each semicircular ring (201a) is provided with a second sleeve ring (201b) for sleeve-mounting the screw rod (102) or the connecting rod (101), and handles (102b) are provided at both ends of the screw rod (102).

4. The power cable damage repair device according to claim 3, characterized in that: Two symmetrical holes (201c) are formed on the semicircular ring (201a), and the straight rod (202a) of the extrusion plate (202) moves along the holes (201c). One end of the straight rod (202a) is fixedly connected to the extrusion plate (202), and a limit plate (202b) is provided at the other end. A second spring (202c) for pushing the extrusion plate (202) to close inward is sleeved on the outer wall of the straight rod (202a).

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