A plate cable anchoring node structure

Abstract

The present invention provides a plate cable anchoring node structure, which includes an end node; the end node includes a second inner clamping plate, a second outer clamping plate, a second pin and a second ear plate; the second inner clamping plate is hub-shaped and has a through hole in the middle; the second ear plate is rotatably connected to the second inner clamping plate through the second pin; an annular clamping channel is provided between the second outer clamping plate and the second inner clamping plate; the plate cable passes through the entrance of the annular clamping channel, wraps around the second inner clamping plate for one circle, and then passes through the entrance of the annular clamping channel and is clamped between the second outer clamping plate and the second inner clamping plate. The present invention creatively introduces a pivoting structure, and the connecting member is rotatably connected to the plate cable through the plate cable anchoring node structure, so as to facilitate assembly, and after assembly, the torsional stress applied to the connecting member is greatly reduced or even disappears, thereby greatly improving the mechanical properties of the entire plate cable structure and greatly improving the safety performance.

Description

Technical Field

[0001] The invention relates to the technical field of engineering construction, and in particular to a plate cable anchoring node structure. Background Art

[0002] At present, with the development of society, the span requirements of buildings in the construction of bridges, stadiums and other projects are getting larger and larger, so as to meet the requirements of special geographical features, use or aesthetics. The above needs require engineering construction and design personnel to continuously innovate in technology to solve various problems in physical mechanics, construction cost, maintenance cost and service life in engineering construction. Among them, plate cables, as a new type of cable structure, have been increasingly used due to their good balance ability, high strength-to-modulus ratio and other physical properties. As a new type of cable, the intermediate node structure and end node settings of the plate cable mostly use ordinary steel cable structures, so further in-depth research is needed to adapt to the special structure of the plate cable.

[0003] In addition, most of the existing nodes are fixed nodes, and the support rods or pull rods connected to the nodes and the cables are relatively fixedly connected to the cables. When there are certain errors, there are difficulties in assembly, and there are large adverse stresses after assembly, which seriously affects the quality and safety of the project.

[0004] At the nodes in the middle, in order to achieve connection with the nodes, the cables often have to be connected by breaking the cables, which leads to a decrease in mechanical properties. Summary of the invention

[0005] The object of the present invention is to provide a plate cable anchoring node structure to solve at least one of the above-mentioned technical problems existing in the prior art.

[0006] In order to solve the above technical problems, the present invention provides a plate cable anchoring node structure, comprising an end node;

[0007] The end node includes: a second inner clamping plate, a second outer clamping plate, a second pin shaft and a second ear plate;

[0008] The second inner clamping plate is hub-shaped and has a through hole in the middle; the second ear plate is rotatably connected to the second inner clamping plate through the second pin shaft;

[0009] An annular clamping channel is provided between the second outer clamping plate and the second inner clamping plate; the plate cable passes through the entrance of the annular clamping channel, winds around the second inner clamping plate once, and then passes through the entrance of the annular clamping channel, and is clamped between the second outer clamping plate and the second inner clamping plate.

[0010] Furthermore, it also includes an end connector for fixing the end of the plate cable, and the second ear plate is fixedly arranged on the end connector.

[0011] The present invention creatively introduces a pivot structure to form a plate cable anchoring end node structure, and the end connecting piece is relatively rotatably connected to the plate cable through the plate cable anchoring end node structure, thereby facilitating assembly. After assembly, the torsional stress applied to the end connecting piece is greatly reduced or even disappears, thereby greatly improving the mechanical properties of the entire plate cable structure and greatly enhancing the safety performance.

[0012] Furthermore, the second outer clamping plate includes: two semi-annular clamping parts; the two semi-annular clamping parts are arranged opposite to each other up and down, one end is pivotally connected to each other, and the other end is respectively provided with a pressing plate; a second outer clamping surface is provided on the inner side surface of the semi-annular clamping part; the two pressing plates are fastened by bolts to clamp the plate cable.

[0013] Furthermore, a second inner clamping surface matching with the second outer clamping surface is provided on the outer circumference of the second inner clamping plate;

[0014] The second outer clamping surface is provided with an outer anti-slip protrusion;

[0015] And / or, the second inner clamping surface is provided with an inner anti-slip protrusion.

[0016] Furthermore, the outer anti-slip protrusion and / or the inner anti-slip protrusion are friction ribs arranged along the axial direction of the through hole.

[0017] Furthermore, the second outer clamping plate is provided with limit sliders on both side end surfaces of the through hole in the axial direction; the second inner clamping plate is provided with end plates on both sides of the axial direction, and the inner side of the end plates is provided with guide grooves cooperating with the limit sliders along the radial direction of the through hole; and are used to prevent the second outer clamping plate from rotating relative to the second inner clamping plate. When the clamping plate is tightened by bolts, the limit slider moves inward along the guide groove, and after tightening, the second outer clamping plate can be prevented from rotating relative to the second inner clamping plate.

[0018] Furthermore, it also includes an intermediate node, which includes: a first inner clamping plate, a first outer clamping plate, a first pin shaft and a first ear plate;

[0019] The first inner clamping plate is hub-shaped and has a through hole in the middle; the first ear plate is rotatably connected to the first inner clamping plate through the first pin shaft;

[0020] A semi-annular clamping channel is provided between the first outer clamping plate and the first inner clamping plate; the plate cable passes through one end of the semi-annular clamping channel and comes out from the other end of the semi-annular clamping channel, and is clamped between the first outer clamping plate and the first inner clamping plate.

[0021] Furthermore, it also includes an intermediate connecting member, and the first ear plate is fixedly provided at one end or both ends of the intermediate connecting member.

[0022] The present invention creatively introduces a pivot structure, and the intermediate connecting piece is rotatably connected to the plate cable through the intermediate node structure of the plate cable anchor, thereby facilitating assembly. After assembly, the torsional stress applied to the intermediate connecting piece is greatly reduced or even disappears, thereby greatly improving the mechanical properties of the entire plate cable structure and greatly enhancing the safety performance.

[0023] Furthermore, the first outer clamping plate comprises: a middle clamping portion, and pressure plate portions are arranged at both ends of the middle clamping portion; the cross section of the middle clamping portion is semicircular, and an outer clamping surface is arranged on the inner side surface of the middle clamping portion.

[0024] Further, an inner clamping surface matching with the outer clamping surface is provided on the outer circumference of the first inner clamping plate;

[0025] The outer clamping surface is provided with an outer anti-slip protrusion;

[0026] And / or, the inner clamping surface is provided with an inner anti-slip protrusion.

[0027] Furthermore, the outer anti-slip protrusion and / or the inner anti-slip protrusion is a friction rib arranged along the axial direction of the through hole.

[0028] Further, the first outer clamping plate includes an upper clamping plate and a lower clamping plate;

[0029] The upper clamping plate comprises: an upper middle clamping portion and upper pressing plate portions arranged at both ends of the upper middle clamping portion; an upper outer clamping surface is arranged on the inner side surface of the upper middle clamping portion;

[0030] The lower clamping plate comprises: a lower middle clamping part and lower pressing plate parts arranged at two ends of the lower middle clamping part; and a lower outer clamping surface is arranged on the inner side surface of the lower middle clamping part.

[0031] The upper pressing plate portion and the lower pressing plate portion are fastened by bolts, thereby clamping the plate cable.

[0032] Furthermore, upper and lower sides of the outer circumference of the first inner clamping plate are respectively provided with: an upper inner clamping surface matched with the upper outer clamping surface, and a lower inner clamping surface matched with the lower outer clamping surface.

[0033] Furthermore, the plate cable includes an upper plate cable and a lower plate cable, the upper plate cable passes between the upper inner clamping surface and the upper outer clamping surface; the lower plate cable passes between the lower inner clamping surface and the lower outer clamping surface; the upper plate cable and the lower plate cable are clamped by the upper pressure plate part and the lower pressure plate part after the two side parts of the middle clamping part are fitted with each other.

[0034] Furthermore, the outer anti-slip protrusions and the inner anti-slip protrusions are staggered and arranged in meshing relationship with each other.

[0035] Furthermore, the plate cable passes between the upper inner clamping surface and the upper outer clamping surface; the inner anti-slip protrusion on the lower inner clamping surface is engaged with the outer anti-slip protrusion on the lower outer clamping surface to prevent the first outer clamping plate from rotating relative to the first inner clamping plate;

[0036] Alternatively, the plate cable passes between the lower inner clamping surface and the lower outer clamping surface; the inner anti-slip protrusion on the upper inner clamping surface engages with the outer anti-slip protrusion on the upper outer clamping surface to prevent the first outer clamping plate from rotating relative to the first inner clamping plate.

[0037] Furthermore, the first outer clamping plate is provided with limit sliders on both side end faces of the through hole in the axial direction; the first inner clamping plate is provided with end plates on both sides of the axial direction, and the inner side of the end plate is provided with guide grooves cooperating with the limit sliders along the radial direction of the through hole; and it is used to prevent the first outer clamping plate from rotating relative to the first inner clamping plate.

[0038] By adopting the above technical solution, the present invention has the following beneficial effects:

[0039] The present invention provides a plate cable anchoring node structure, which creatively introduces a pivot structure, and the end connecting piece or the middle connecting piece is rotatably connected to the plate cable through the plate cable anchoring node structure, thereby facilitating assembly. After assembly, the torsional stress applied to the connecting piece is greatly reduced or even disappears, thereby greatly improving the mechanical properties of the entire plate cable structure and greatly enhancing the safety performance.

[0040] In addition, the limiting slider and the guide groove structure can effectively prevent the outer plate and the inner plate from rotating relative to each other. Combined with the bending shape of the plate cable at the node, the relative rotation among the plate cable, the outer plate and the inner plate can be effectively avoided, which greatly improves the connection strength between the node and the plate cable and can keep the node connection stable and reliable for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A three-dimensional diagram of a middle end node of a plate cable anchoring node structure provided in Example 1 of the present invention;

[0043] Figure 2 A schematic diagram of an exploded view of a middle end node provided in Example 1 of the present invention;

[0044] Figure 3 for Figure 1 A perspective view of the second outer splint shown;

[0045] Figure 4 A three-dimensional diagram of an intermediate node provided in Embodiment 2 of the present invention;

[0046] Figure 5 A schematic diagram of an intermediate node provided in Embodiment 2 of the present invention;

[0047] Figure 6 for Figure 4 A perspective view of the first outer splint shown;

[0048] Figure 7 A schematic diagram of the structure of an intermediate node provided in Embodiment 3 of the present invention;

[0049] Figure 8 A schematic diagram of the structure of an intermediate node provided in Embodiment 4 of the present invention;

[0050] Fig. 9 for Figure 8 Enlarged schematic diagram at point A in the middle. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0052] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "second", "secondary", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The present invention is further explained below in conjunction with specific implementation modes.

[0055] Example 1

[0056] This embodiment discloses a plate cable anchoring node structure, including an end node;

[0057] like Figure 1-3 As shown, the end node includes: a second inner clamping plate 60, a second outer clamping plate 50, a second pin shaft 70 and a second ear plate 71; the second inner clamping plate 60 is hub-shaped and has a through hole 64 in the middle; the second ear plate 71 is rotatably connected to the second inner clamping plate 60 through the second pin shaft 70.

[0058] Specifically, an annular clamping channel is provided between the second outer clamping plate 50 and the second inner clamping plate 60; the second outer clamping plate 50 comprises: two semi-annular clamping parts 51, namely an upper semi-annular clamping part 50a and a lower semi-annular clamping part 50b; the two semi-annular clamping parts 51 are arranged opposite to each other up and down, one end of which is pivotally connected to each other through a pivot shaft 53, and the other end is respectively provided with a pressing plate 52; the plate cable 10 (specifically, one end 13 of the plate cable structure) passes through the entrance of the annular clamping channel, winds around the second inner clamping plate 60 for one circle, and then passes through the entrance of the annular clamping channel. After the plate cable is folded in half, it is clamped between the upper and lower pressing plates 52, and the two pressing plates 52 are fastened by bolts to clamp the plate cable.

[0059] Generally, the second ear plate 71 is fixedly arranged on the end connector for connecting one end of the plate cable. The present invention creatively introduces a pivot structure to form a plate cable anchoring end node structure, through which the end connector is relatively rotatably connected to the plate cable, thereby facilitating assembly, and after assembly, the torsional stress applied to the end connector is greatly reduced or even eliminated, thereby greatly improving the mechanical properties of the entire plate cable structure and greatly improving the safety performance.

[0060] like Figure 3 As shown, a second outer clamping surface 54 is provided on the inner side surface of the semi-annular clamping portion 51; a second inner clamping surface 61 matching with the second outer clamping surface 54 is provided on the outer circumference of the second inner clamping plate 60;

[0061] The second outer clamping surface 54 is provided with an outer anti-slip protrusion 55, and the second inner clamping surface 61 is provided with an inner anti-slip protrusion 62. The outer anti-slip protrusion and the inner anti-slip protrusion are preferably friction ribs arranged along the axial direction of the through hole.

[0062] The present invention provides a plate cable anchoring node structure, which creatively introduces a pivot structure, and the end connecting piece or the middle connecting piece is rotatably connected to the plate cable through the plate cable anchoring node structure, thereby facilitating assembly. After assembly, the torsional stress applied to the connecting piece is greatly reduced or even disappears, thereby greatly improving the mechanical properties of the entire plate cable structure and greatly enhancing the safety performance.

[0063] Example 2

[0064] like Figure 4-6 As shown, a plate cable anchoring node structure provided in this embodiment further includes an intermediate node, that is, the two ends of the plate cable are connected by end nodes, and the middle part is supported by an intermediate node, wherein the intermediate node includes: a first inner clamping plate 30, a first outer clamping plate 20, a first pin shaft 40 and a first ear plate 41;

[0065] The first inner clamping plate 30 is hub-shaped, with end plates 34 provided on both sides of the axial direction and a through hole 31 in the middle; the first pin shaft 40 is rotatably inserted in the through hole 31, and the first ear plate 41 is rotatably connected to the first inner clamping plate 30 through the first pin shaft 40; the first outer clamping plate 20 has two pieces, namely an upper clamping plate 20a and a lower clamping plate 20b.

[0066] A semi-annular clamping channel is respectively provided between the upper clamping plate 20a and the lower clamping plate 20b and the first inner clamping plate 30; the plate cable 10 passes through one end of the semi-annular clamping channel and passes out from the other end of the semi-annular clamping channel, and is clamped between the first outer clamping plate 20 and the first inner clamping plate 30. Specifically, the plate cable 10 includes an upper plate cable 11 and a lower plate cable 12; the upper plate cable 11 passes through the upper semi-annular clamping channel between the upper clamping plate 20a and the first inner clamping plate 30, and the lower plate cable 12 passes through the lower semi-annular clamping channel between the lower clamping plate 20b and the first inner clamping plate 30. The upper plate cable 11 and the lower plate cable 12 are clamped by the upper pressing plate portion of the upper clamping plate 20a and the lower pressing plate portion of the lower clamping plate 20b after the two side portions of the middle clamping portion 21 are attached to each other.

[0067] The first ear plate 41 is generally fixedly arranged at one end or both ends of an intermediate connecting member such as a support rod, and the intermediate connecting member such as a support rod is rotatably connected to the plate cable 10 through the first ear plate.

[0068] The present invention creatively introduces a pivot structure, and the intermediate connecting piece is rotatably connected to the plate cable 10 by anchoring the intermediate node structure through the plate cable 10, so as to facilitate assembly. After assembly, the torsional stress applied to the intermediate connecting piece is greatly reduced or even disappears, thereby greatly improving the mechanical properties of the entire plate cable 10 structure and greatly enhancing the safety performance.

[0069] like Figure 6As shown, the first outer clamping plate 20 includes: a middle clamping portion 21 and pressure plate portions 22 disposed at both ends of the middle clamping portion 21 ; the middle clamping portion 21 has a semicircular cross section, and an outer clamping surface 23 is disposed on the inner side surface of the middle clamping portion 21 .

[0070] Furthermore, an inner clamping surface 32 matching with the outer clamping surface 23 is provided on the outer circumference of the first inner clamping plate 30;

[0071] The outer clamping surface 23 is provided with an outer anti-skid protrusion 24, and the inner clamping surface 32 is provided with an inner anti-skid protrusion 33. The anti-skid protrusions are in many forms, such as dot protrusions, protective diagonal lines, etc., especially friction ribs arranged along the axial direction of the through hole 31.

[0072] The upper clamping plate 20a and the lower clamping plate 20b are arranged opposite to each other up and down. The upper clamping plate 20a includes: an upper middle clamping part and an upper pressure plate part arranged at both ends of the upper middle clamping part; an upper outer clamping surface is arranged on the inner side of the upper middle clamping part; the lower clamping plate 20b includes: a lower middle clamping part and a lower pressure plate part arranged at both ends of the lower middle clamping part; a lower outer clamping surface is arranged on the inner side of the lower middle clamping part. The upper pressure plate part and the lower pressure plate part are fastened by bolts to clamp the plate cable 10.

[0073] The present invention provides a plate cable 10 anchoring node structure, which creatively introduces a pivot structure. The intermediate connecting piece is rotatably connected to the plate cable 10 through the plate cable 10 anchoring intermediate node structure, thereby facilitating assembly. After assembly, the torsional stress applied to the intermediate connecting piece is greatly reduced or even disappears, thereby greatly improving the mechanical properties of the entire plate cable 10 structure and greatly enhancing the safety performance.

[0074] Example 3

[0075] This embodiment is basically the same as Embodiment 2, except that:

[0076] like Figure 7 As shown, the plate cable 10 only includes an upper plate cable 11, which passes between the upper inner clamping surface and the upper outer clamping surface; the inner anti-slip protrusion 33 on the lower inner clamping surface of the first inner clamping plate 30 engages with the outer anti-slip protrusion 24 on the lower outer clamping surface of the lower clamping plate 20b, which is used to prevent the first outer clamping plate 20 from rotating relative to the first inner clamping plate 30.

[0077] At the same time, by arranging mutually meshing anti-slip protrusion structures, the first outer clamping plate 20 and the first inner clamping plate 30 can be effectively prevented from relative rotation. Combined with the Ω shape of the plate cable 10 at the node, the relative rotation among the plate cable 10, the first outer clamping plate 20 and the first inner clamping plate 30 can be effectively avoided, which greatly improves the connection strength between the node and the plate cable 10 and can keep the node connection stable and reliable for a long time.

[0078] Example 4

[0079] This embodiment is basically the same as Embodiment 2, except that:

[0080] like Figure 8 and 9 As shown, the first outer clamping plate 20 (specifically, both the upper and lower clamping plates) is provided with limit sliders 25 on both side end faces of the through hole in the axial direction; the first inner clamping plate 30 is provided with end plates 34 on both sides of the axial direction, and the inner side of the end plate 34 is provided with a guide groove 34a that cooperates with the limit slider 25 along the radial direction of the through hole; it is used to prevent the first outer clamping plate 20 from rotating relative to the first inner clamping plate 30.

[0081] The structure of this embodiment is simpler, and can effectively prevent the first outer clamping plate 20 and the first inner clamping plate 30 from rotating relative to each other. Combined with the curved shape of the plate cable 10 at the node, the relative rotation among the plate cable 10, the first outer clamping plate 20 and the first inner clamping plate 30 can be effectively avoided, which greatly improves the connection strength between the node and the plate cable 10 and can keep the node connection stable and reliable for a long time.

[0082] Similarly, the second outer clamping plate 50 may also be provided with limit sliders on both side end surfaces of the through hole 64 in the axial direction; the second inner clamping plate 60 is provided with end plates on both sides of the axial direction, and the inner side of the end plates is provided with guide grooves that cooperate with the limit sliders along the radial direction of the through hole 64, which are used to prevent the second outer clamping plate 50 from rotating relative to the second inner clamping plate 60. When the bolts are used to tighten the clamping plate 52, the limit sliders move inward along the guide grooves, and after tightening, the second outer clamping plate 50 can be prevented from rotating relative to the second inner clamping plate 60.

[0083] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plate cable anchoring node structure, characterized in that: Include end nodes; The end node includes: a second inner clamping plate, a second outer clamping plate, a second pin shaft and a second ear plate; The second inner clamping plate is hub-shaped and has a through hole in the middle; the second ear plate is rotatably connected to the second inner clamping plate through the second pin shaft; An annular clamping channel is provided between the second outer clamping plate and the second inner clamping plate; the plate cable passes through the entrance of the annular clamping channel, wraps around the second inner clamping plate once, and then passes through the entrance of the annular clamping channel, and is clamped between the second outer clamping plate and the second inner clamping plate; Also includes an end connector for fixing the end of the plate cable, the second ear plate is fixedly disposed on the end connector; The second outer clamping plate includes: two semi-annular clamping parts; the two semi-annular clamping parts are arranged opposite to each other up and down, one end is pivotally connected to each other, and the other end is respectively provided with a pressing plate; a second outer clamping surface is provided on the inner side surface of the semi-annular clamping part; the two pressing plates are fastened by bolts to clamp the plate cable.

2. The plate cable anchoring node structure according to claim 1, characterized in that: The second inner clamping plate is provided with a second inner clamping surface on its outer circumference, which matches with the second outer clamping surface; The second outer clamping surface is provided with an outer anti-slip protrusion; And / or, the second inner clamping surface is provided with an inner anti-slip protrusion.

3. The plate cable anchoring node structure according to claim 2, characterized in that: The outer anti-slip protrusion and / or the inner anti-slip protrusion are friction ribs arranged along the axial direction of the through hole.

4. The plate cable anchoring node structure according to claim 1, characterized in that: Also included is an intermediate node, the intermediate node including: a first inner clamping plate, a first outer clamping plate, a first pin shaft and a first ear plate; The first inner clamping plate is hub-shaped and has a through hole in the middle; the first ear plate is rotatably connected to the first inner clamping plate through the first pin shaft; A semi-annular clamping channel is provided between the first outer clamping plate and the first inner clamping plate; the plate cable passes through one end of the semi-annular clamping channel and comes out from the other end of the semi-annular clamping channel, and is clamped between the first outer clamping plate and the first inner clamping plate.

5. The plate cable anchoring node structure according to claim 4, characterized in that: The first outer clamping plate comprises: a middle clamping portion, and pressure plate portions are arranged at both ends of the middle clamping portion; the cross section of the middle clamping portion is semicircular, and an outer clamping surface is arranged on the inner side surface of the middle clamping portion.

6. The plate cable anchoring node structure according to claim 5, characterized in that: An inner clamping surface matching the outer clamping surface is provided on the outer circumference of the first inner clamping plate; The outer clamping surface is provided with an outer anti-slip protrusion; And / or, the inner clamping surface is provided with an inner anti-slip protrusion.

7. The plate cable anchoring node structure according to claim 6, characterized in that: The first outer clamping plate includes an upper clamping plate and a lower clamping plate; The upper clamping plate comprises: an upper middle clamping portion and upper pressing plate portions arranged at both ends of the upper middle clamping portion; an upper outer clamping surface is arranged on the inner side surface of the upper middle clamping portion; The lower clamping plate comprises: a lower middle clamping part and lower pressing plate parts arranged at two ends of the lower middle clamping part; and a lower outer clamping surface is arranged on the inner side surface of the lower middle clamping part.

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