A threaded connection type thermal insulation board positioning part

Abstract

The present invention discloses a threaded connection type thermal insulation board positioning member, belonging to the technical field of building thermal insulation. It includes a pull tab and a first positioning member. The first positioning member includes a positioning member main body and a nut. The positioning member main body includes a thermal insulation board abutting portion and a columnar portion. A threaded rib is circumferentially arranged on the outer peripheral surface of the columnar portion, and a notch portion is formed on the threaded rib. A plurality of first protrusions and a plurality of second protrusions are respectively arranged on the two narrow side surfaces of the first end of the pull tab, and the first protrusions and the second protrusions can be placed in the notch portion. For the threaded connection type thermal insulation board positioning member provided by the present invention, the first protrusions and the second protrusions on the pull tab can be placed in the notch portion where it is continuously connected with the threaded rib. After tightening the nut on the columnar portion, the pull tab, the positioning member main body and the nut can be firmly connected, and the wire mesh is pressed into the first wire mesh clamping groove on the positioning member main body through the nut, which improves the connection strength between the thermal insulation board and the wire mesh, and is convenient for assembly and has high construction efficiency.

Description

Technical Field

[0001] The present invention relates to a threaded connection type thermal insulation board positioning member, belonging to the technical field of building thermal insulation. Background Art

[0002] In a building, as an external envelope structure, the exterior wall has a large heat loss. Therefore, the development of exterior wall external thermal insulation technology can not only save a large amount of energy, but also provide a comfortable environment for residents. In the cast-in-place concrete system for exterior wall external thermal insulation, the thermal insulation board and concrete are compounded during the concrete pouring process, which can effectively shorten the construction period and avoid problems such as wall hollowing and peeling. During the construction of shear walls, a wire mesh, a thermal insulation board, and a steel reinforcement cage need to be erected in sequence between the external formwork and the internal formwork, so that a pouring cavity is formed between the thermal insulation board and the external formwork and between the thermal insulation board and the internal formwork respectively. During the construction of infill walls, a first wire mesh, a thermal insulation board, and a second wire mesh need to be erected in sequence between the external formwork and the internal formwork. The construction quality of the wall is closely related to the distances between the thermal insulation board and the two side formworks, between the wire mesh and the formworks, and between the wire mesh and the thermal insulation board. In order to fix the positions of the thermal insulation board and the wire mesh, it is necessary to firmly connect the thermal insulation board and the wire mesh through connecting pieces. Especially at present, in order to improve the on-site construction efficiency, more and more construction parties prefabricate and assemble the thermal insulation board and the wire mesh in the factory and then transport them to the construction site. If the prefabricated assembly structure is unstable, problems such as the wire mesh and the thermal insulation board falling apart or deforming will occur during the transfer to the construction site, ultimately affecting the construction quality of the wall.

[0003] Currently, the connecting pieces for fixing the positions of the thermal insulation board and the wire mesh generally include a pull tab and two positioning members. During assembly, the pull tab is passed through the thermal insulation board and then the two positioning members are respectively fixed on the positioning members on both sides of the thermal insulation board, and the wire mesh can be connected to the positioning members or the pull tab by tying or other means. The applicant of the present invention has developed and improved a variety of connecting pieces in practice. For example, in invention patents such as "CN202121764680.5 Positioning and supporting member between wire mesh and thermal insulation board, prefabricated composite structure", "CN202211127357.2 A pull tab type connecting piece", "CN202211186929.4 A connecting piece for connecting wire mesh and thermal insulation board", "CN202211705088.3 A pull tab type limiting connecting piece for connecting wire mesh and thermal insulation board", etc., various forms of pull tab and positioning member structures have been provided. The applicant has found in the actual application process that although the above disclosed structures can quickly connect and fix the wire mesh, positioning members on one side of the thermal insulation board, the pull tab and the thermal insulation board when applied to infill walls, when connecting the wire mesh, positioning members on the other side of the thermal insulation board to the card and the thermal insulation board, operations such as tying are still required to complete, and the stability of the connection structure and the construction efficiency need to be further improved.

[0004] It should be noted that the above content belongs to the technical cognition scope of the inventor and does not necessarily constitute the prior art. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a threaded connection type thermal insulation board positioning member, which improves the connection strength between the thermal insulation board and the wire mesh sheet, and is convenient for assembly and has high construction efficiency.

[0006] The present invention achieves the above object by adopting the following technical solutions:

[0007] A threaded connection type thermal insulation board positioning member includes a pull tab and a first positioning member. The pull tab is a long plate-like structure extending linearly between a first end and a second end, and the pull tab has two narrow side surfaces and two wide side surfaces parallel to its extending direction;

[0008] The first positioning member includes a positioning member main body and a nut. The positioning member main body includes a thermal insulation board abutting portion and a columnar portion. The thermal insulation board abutting portion has a first side surface and a second side surface arranged oppositely, and the first side surface of the thermal insulation board abutting portion constitutes an abutting surface. The columnar portion is connected to the second side surface of the thermal insulation board abutting portion, and the axis of the columnar portion is perpendicular to the abutting surface. A threaded rib is wound around the outer peripheral surface of the columnar portion;

[0009] A pull tab passing channel is penetrated through the first positioning member. The penetrating direction of the pull tab passing channel is perpendicular to the abutting surface of the thermal insulation board abutting portion. The pull tab passing channel sequentially penetrates through the thermal insulation board abutting portion and the columnar portion. The pull tab passing channel in the columnar portion also penetrates through the threaded rib perpendicularly outward in the direction perpendicular to the axis of the columnar portion, so as to form a notch portion on the threaded rib. A first wire mesh clamping groove is also opened on the columnar portion. The first wire mesh clamping groove is vertically and crosswise arranged with the pull tab passing channel. The first wire mesh clamping groove extends from the end surface of the columnar portion towards the abutting portion direction, and the first wire mesh clamping groove penetrates through the columnar portion in the direction perpendicular to the axis of the columnar portion;

[0010] A second wire mesh clamping groove is opened at the first end of the pull tab. The second wire mesh clamping groove extends from the first end surface of the pull tab towards the second end of the pull tab. A plurality of first protrusions and a plurality of second protrusions are respectively arranged on the two narrow side surfaces close to the first end of the pull tab. The distance between adjacent first protrusions and the distance between adjacent second protrusions are both equal to the pitch of the threaded rib. The first protrusions and the second protrusions are staggered with each other along the extending direction of the pull tab, and the staggering distance is equal to half of the pitch of the threaded rib;

[0011] When the pull tab is inserted into the pull tab passing channel, the first protrusions and the second protrusions on the pull tab can be placed in the notch portion of the threaded rib, so that the threaded rib is continuously connected with the first protrusions and the second protrusions;

[0012] The inner wall of the nut is provided with a thread groove matched with the threaded rib.

[0013] Optionally, the main body of the positioning member further includes a socket portion, which is connected between the heat preservation board abutting portion and the columnar portion, and the pull tab passing-through channel penetrates through the socket portion.

[0014] Optionally, the main body of the positioning member further includes a rib plate, which is connected between the socket portion and the heat preservation board abutting portion.

[0015] Optionally, the columnar portion has a hollow tubular structure.

[0016] Optionally, the outer peripheral surface of the nut is hexagonal.

[0017] Optionally, both axial end faces of the nut are open.

[0018] Optionally, the second wire mesh card slot and the first wire mesh card slot have the same extension depth.

[0019] Optionally, a plurality of insertion teeth are arranged on the abutting surface of the heat preservation board abutting portion, and the insertion teeth extend in a direction perpendicular to the abutting surface.

[0020] Optionally, a plurality of through holes are formed in the heat preservation board abutting portion.

[0021] Optionally, the threaded connection type heat preservation board positioning member provided by the present invention further includes a second positioning member, which is used for being installed at the second end of the pull tab, and the second positioning member is mutually connected with the pull tab through a positioning mechanism to limit the backward movement between the first positioning member and the second positioning member.

[0022] The beneficial effects of the present application include but are not limited to:

[0023] For the threaded connection type heat preservation board positioning member provided by the present invention, a threaded rib is arranged on the outer peripheral surface of the columnar portion of the positioning member main body, and the pull tab passing-through channel penetrates through the threaded rib to form a notch portion on the threaded rib. When the pull tab passes through the positioning member main body, the first protrusion and the second protrusion on the pull tab can be placed at the continuous connection of the notch portion and the threaded rib. After the nut is tightened on the columnar portion, the pull tab, the positioning member main body and the nut can be firmly connected, and the wire mesh is pressed in the first wire mesh card slot on the positioning member main body through the nut, which improves the connection strength between the heat preservation board and the wire mesh, and is convenient for assembly and has high construction efficiency. Description of the Drawings

[0024] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0025] Figure 1Schematic diagram of the threaded connection type thermal insulation board positioning member provided by the present invention;

[0026] Figure 2 is Figure 1 sectional view of;

[0027] Figure 3 is Figure 1 three-dimensional view of the pull tab in;

[0028] Figure 4 sectional view of the positioning member main body;

[0029] Figure 5 three-dimensional view of the positioning member main body at one angle;

[0030] Figure 6 three-dimensional view of the positioning member main body at another angle;

[0031] Figure 7 sectional view of the nut;

[0032] Figure 8 three-dimensional view of the nut;

[0033] Figure 9 schematic diagram of the connection state between the first positioning member and the wire mesh;

[0034] Figure 10 schematic diagram of the positioning member main body when the columnar section is hollow;

[0035] Figure 11 schematic diagram of the assembly state of the threaded connection type thermal insulation board positioning member provided by the present invention with the thermal insulation board and the wire mesh when applied to the infill wall;

[0036] Figure 12 , Figure 13 and Figure 14 schematic diagrams of other optional structures of the pull tab;

[0037] In the figure, 100, pull tab; 110, second wire mesh card slot; 120, first protrusion; 130, second protrusion; 200, first positioning member; 201, pull tab passing-through channel; 210, positioning member main body; 211, thermal insulation board abutting portion; 212, columnar portion; 213, threaded rib; 214, notch portion; 215, first wire mesh card slot; 216, socket portion; 217, rib plate; 218, inserted tooth; 219, through hole; 220, nut; 221, threaded groove; 300, second positioning member; 400, thermal insulation board; 500, wire mesh. Detailed implementation manners

[0038] To clearly illustrate the technical features of the present solution, the present invention will be elaborated in detail below through specific implementation manners and in conjunction with its accompanying drawings.

[0039] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited by the specific embodiments disclosed below.

[0040] As Figure 1 - Figure 2 shown, the threaded connection type thermal insulation board positioning member provided by the present invention includes a pull tab 100 and a first positioning member 200. The first positioning member 200 includes a positioning member main body 210 and a nut 220. As Figure 3 shown, the pull tab 100 is a long plate-like structure extending linearly between a first end and a second end. The pull tab 100 has two narrow side surfaces and two wide side surfaces parallel to its extending direction. In the attached drawings, the side surface parallel to the paper surface direction is the wide side surface of the pull tab, and the side surface perpendicular to the paper surface direction is the narrow side surface of the pull tab.

[0041] As Figure 4 - Figure 6 shown, the positioning member main body 210 includes a thermal insulation board abutting portion 211 and a columnar portion 212. The thermal insulation board abutting portion 211 has a first side surface and a second side surface arranged oppositely. The first side surface of the thermal insulation board abutting portion 211 constitutes an abutting surface. The columnar portion 212 is connected to the second side surface of the thermal insulation board abutting portion 211. The axis of the columnar portion 212 is perpendicular to the abutting surface. A threaded rib 213 is wound around the outer peripheral surface of the columnar portion 212.

[0042] A pull tab passing-through channel 201 is formed through the first positioning member 200. The cross-sectional dimension of the pull tab passing-through channel 201 matches the cross-sectional dimension of the pull tab 100. The passing-through direction of the pull tab passing-through channel 201 is perpendicular to the abutting surface of the thermal insulation board abutting portion 211. The pull tab passing-through channel 201 sequentially passes through the thermal insulation board abutting portion 211 and the columnar portion 212. The pull tab passing-through channel 201 in the columnar portion 212 also penetrates outward through the threaded rib 213 perpendicular to the axis direction of the columnar portion 212, so as to form a notch portion 214 on the threaded rib 213. A first wire mesh clamping groove 215 is also formed on the columnar portion 212. The first wire mesh clamping groove 215 is vertically and crosswise arranged with the pull tab passing-through channel 201. The first wire mesh clamping groove 215 extends from the end surface of the columnar portion 212 towards the abutting portion direction. The first wire mesh clamping groove 215 penetrates through the columnar portion 212 perpendicular to the axis direction of the columnar portion 212.

[0043] As Figure 3As shown in the figure, a second wire mesh card slot 110 is provided at the first end of the pull tab 100. The second wire mesh card slot 110 extends from the first end face of the pull tab 100 towards the second end of the pull tab 100. A plurality of first protrusions 120 and a plurality of second protrusions 130 are respectively provided on two narrow side faces close to the first end of the pull tab 100. The distance between adjacent first protrusions 120 and the distance between adjacent second protrusions 130 are both equal to the pitch of the threaded rib 213. The first protrusions 120 and the second protrusions 130 are staggered from each other along the extension direction of the pull tab 100, and the staggered distance is equal to half of the pitch of the threaded rib 213. That is, as Figure 2 shown in the figure, the first protrusions 120 and the second protrusions 130 are not directly opposite to each other vertically, but are staggered by half a pitch.

[0044] As Figure 3 shown in the figure, when the pull tab 100 is inserted into the pull tab through-channel 201, the first protrusions 120 and the second protrusions 130 on the pull tab 100 can be placed in the notch 214 of the threaded rib 213, so that the threaded rib 213 is continuously connected with the first protrusions 120 and the second protrusions 130;

[0045] As Figure 7 - Figure 8 shown in the figure, the inner wall of the nut 220 is provided with a threaded groove 221 that cooperates with the threaded rib 213.

[0046] As Figure 1 、 Figure 2 and Figure 9 shown in the figure, during operation, the positioning member main body 210 is sleeved on the first end of the pull tab 100, so that the first wire mesh card slot 215 on the positioning member main body 210 is aligned with the second wire mesh card slot 110 on the pull tab 100. The horizontal wires of the wire mesh 500 slide into the first wire mesh card slot 215 (the second wire mesh card slot 110). Adjust the position of the positioning member main body 210 so that the first protrusions 120 and the second protrusions 130 on the pull tab 100 are placed in the notch 214 of the threaded rib 213. Then, screw the nut 220 onto the columnar portion 212. In this way, the nut 220, the pull tab 100, and the positioning member main body 210 are assembled together. The horizontal wires of the wire mesh 500 are clamped between the nut 220 and the bottom of the first wire mesh card slot 215 (the second wire mesh card slot 110), and no relative displacement can occur between the first positioning member 200 and the pull tab 100.

[0047] A certain distance needs to be maintained between the wire mesh and the insulation board. To facilitate the control of this distance, as Figure 4 - Figure 6As shown, in a preferred embodiment, the positioning member body 210 further includes a socket portion 216. The socket portion 216 is connected between the insulation board abutting portion 211 and the columnar portion 212. The tab passing through channel 201 penetrates through the socket portion 216. The extension length of the socket portion 216 in the direction perpendicular to the abutting surface is equal to the distance between the wire mesh and the insulation board. Generally, the socket portion 216 is arranged as a square housing, and the inner cavity of the housing forms the tab passing through channel 201.

[0048] When the socket portion 216 is arranged as a square housing, the overall thickness of the socket portion 216 is relatively small, and the connection surface between the socket portion 216 and the insulation board abutting portion 211 is also relatively small. In order to ensure the strength of the socket portion 216 and its connection strength with the insulation board abutting portion 211, in a preferred embodiment, the positioning member body 210 further includes a rib plate 217. The rib plate 217 is connected between the socket portion 216 and the insulation board abutting portion 211. As Figure 5 shown, one side surface of the rib plate 217 is connected to the second side surface of the insulation board abutting portion 211, and the other side surface of the rib plate 217 is connected to the socket portion 216. Generally, the extension length of the rib plate 217 in the direction perpendicular to the abutting surface is equal to the length of the socket portion 216.

[0049] As Figure 10 shown, in a preferred embodiment, the columnar portion 212 has a hollow tubular structure, which can save raw materials of the positioning member body 210.

[0050] When the columnar portion 212 is arranged as a hollow tubular structure, it is preferred that both axial end surfaces of the nut 220 are open, so that concrete can be injected into the hollow inner cavity of the columnar portion 212.

[0051] Furthermore, the outer peripheral surface of the nut 220 is preferably hexagonal, which can facilitate tightening the nut 220 onto the columnar portion 212.

[0052] Furthermore, as Figure 2 shown, the extension depth of the second wire mesh slot 110 is the same as that of the first wire mesh slot 215, so that the horizontal wires of the wire mesh are supported by the bottoms of the second wire mesh slot 110 and the first wire mesh slot 215 at the same time.

[0053] Furthermore, a plurality of insertion teeth 218 are arranged on the abutting surface of the insulation board abutting portion 211. The insertion teeth 218 extend in the direction perpendicular to the abutting surface. The insertion teeth 218 can be inserted into the insulation board, and a connection can be formed between the first positioning member and the insulation board.

[0054] Furthermore, a plurality of through holes 219 are formed in the insulation board abutting portion 211, which can reduce the weight of the positioning member body 210 and save raw materials.

[0055] The function of the threaded connection type thermal insulation board positioning member provided by the present invention is to fix the position of the wire mesh and fix the position of the thermal insulation board to prevent the thermal insulation board from moving towards the first end and the second end of the tab. Therefore, as Figure 11 shown, the threaded connection type thermal insulation board positioning member provided by the present invention further includes a second positioning member, which is used to be installed at the second end of the tab 100. The second positioning member is interconnected with the tab 100 through a positioning mechanism to limit the backward movement between the first positioning member 200 and the second positioning member 300.

[0056] When the threaded connection type thermal insulation board positioning member provided by the present invention is applied to a shear wall, since the wire mesh 500 is only arranged on the outer side of the thermal insulation board 400, so as Figure 12 shown, the first end (left end) of the tab and the first positioning member both adopt the structure provided by the present invention. The second end (right end) of the tab and the corresponding positioning mechanism and the second positioning member can adopt the structures of the right end of the tab and the positioning member disclosed in the patents "CN202121764680.5 Positioning support member between wire mesh and thermal insulation board, prefabricated composite structure" and "CN202122089576.8 Positioning support member, composite structure of wire mesh and thermal insulation board, construction support system".

[0057] When the threaded connection type thermal insulation board positioning member provided by the present invention is applied to a filler wall, wire meshes need to be arranged on both sides of the thermal insulation board. So as Figure 3 , Figure 13 and Figure 14 shown, the first end (right end) of the tab and the first positioning member both adopt the structure provided by the present invention. The second end (left end) of the tab and the corresponding positioning mechanism and the second positioning member can either adopt the same structure as the present invention ( Figure 13 ), or adopt the structures of the left end of the tab and the positioning member disclosed in the patents "CN202211127357.2 A tab type connecting member" ( Figure 3 ), "CN202211186929.4 A connecting member for connecting wire mesh and thermal insulation board" ( Figure 3 ), "CN202211705088.3 A tab type limiting connecting member for connecting wire mesh and thermal insulation board" ( Figure 3 ), and "CN202122089576.8 Positioning support member, composite structure of wire mesh and thermal insulation board, construction support system" ( Figure 14 ). When the tab adopts the structure in Figure 3 , it is necessary to first assemble the second positioning member with the tab and the corresponding wire mesh.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0059] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The above specific implementation manners cannot be used as a limitation to the protection scope of the present invention. For those skilled in the art of the present technology, any alternative improvement or transformation made to the implementation manners of the present invention falls within the protection scope of the invention.

[0061] Where the present invention is not described in detail, it is the common general knowledge of those skilled in the art of the present technology.

Claims

1. A threaded connection type thermal insulation board positioning member, comprising a tab and a first positioning member. The tab is a long plate-shaped structure extending linearly between a first end and a second end, and the tab has two narrow side surfaces and two wide side surfaces parallel to its extending direction. It is characterized in that The first positioning member includes a positioning member body and a nut. The positioning member body includes a thermal insulation board abutting portion and a columnar portion. The thermal insulation board abutting portion has a first side surface and a second side surface arranged oppositely, and the first side surface of the thermal insulation board abutting portion constitutes an abutting surface. The columnar portion is connected to the second side surface of the thermal insulation board abutting portion, and the axis of the columnar portion is perpendicular to the abutting surface. A threaded rib is circumferentially arranged on the outer peripheral surface of the columnar portion. A tab passing-through channel is penetrated through the first positioning member. The penetrating direction of the tab passing-through channel is perpendicular to the abutting surface of the thermal insulation board abutting portion. The tab passing-through channel sequentially penetrates through the thermal insulation board abutting portion and the columnar portion. The tab passing-through channel in the columnar portion also penetrates perpendicularly to the axis direction of the columnar portion outward through the threaded rib, so as to form a notch portion on the threaded rib. A first wire mesh clamping groove is also opened on the columnar portion. The first wire mesh clamping groove is vertically and crosswise arranged with the tab passing-through channel. The first wire mesh clamping groove extends from the end surface of the columnar portion towards the abutting portion direction, and the first wire mesh clamping groove penetrates through the columnar portion perpendicularly to the axis direction of the columnar portion. A second wire mesh clamping groove is opened at the first end of the tab. The second wire mesh clamping groove extends from the first end surface of the tab towards the second end of the tab. A plurality of first protrusions and a plurality of second protrusions are respectively arranged on two narrow side surfaces close to the first end of the tab. The distance between adjacent first protrusions and the distance between adjacent second protrusions are both equal to the pitch of the threaded rib. The first protrusions and the second protrusions are staggered with each other along the extending direction of the tab, and the staggering distance is equal to half of the pitch of the threaded rib. When the tab is inserted into the tab passing-through channel, the first protrusions and the second protrusions on the tab can be placed in the notch portion of the threaded rib, so that the threaded rib is continuously connected with the first protrusions and the second protrusions. The inner wall of the nut is provided with a thread groove matching with the threaded rib.

2. The threaded connection type thermal insulation board positioning member according to claim 1, characterized in that The positioning member body further includes a socket portion. The socket portion is connected between the thermal insulation board abutting portion and the columnar portion, and the tab passing-through channel penetrates through the socket portion.

3. The threaded connection type thermal insulation board positioning member according to claim 2, characterized in that, The positioning member body further includes a rib plate. The rib plate is connected between the socket portion and the thermal insulation board abutting portion.

4. The threaded connection type thermal insulation board positioning member according to claim 1, wherein, The columnar portion has a hollow tubular structure.

5. The threaded connection type thermal insulation board positioning member according to claim 1, wherein, The outer peripheral surface of the nut is hexagonal.

6. The threaded connection type thermal insulation board positioning member according to claim 1, characterized in that Both axial end surfaces of the nut are open.

7. The threaded connection type thermal insulation board positioning member according to claim 1, wherein The extending depths of the second wire mesh clamping groove and the first wire mesh clamping groove are the same.

8. The threaded connection type thermal insulation board positioning member according to claim 1, characterized in that A plurality of insertion teeth are arranged on the abutting surface of the thermal insulation board abutting portion. The insertion teeth extend in a direction perpendicular to the abutting surface.

9. The threaded connection type thermal insulation board positioning member according to claim 1, wherein A plurality of through holes are opened on the thermal insulation board abutting portion.

10. The threaded connection type thermal insulation board positioning member according to claim 1, characterized in that, It further includes a second positioning member. The second positioning member is used to be installed at the second end of the tab. The second positioning member is mutually connected with the tab through a positioning mechanism to limit the back-and-forth movement between the first positioning member and the second positioning member.

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