Connecting chain piece and conveying belt with same

Abstract

The connecting chain piece comprises a connecting part and a supporting part, the connecting part comprises a bottom plate, a first side plate, a second side plate and a third side plate are arranged on the bottom plate, the first side plate and the second side plate extend upwards along the edge of the bottom plate, the first side plate and the second side plate are oppositely arranged, and the supporting part is arranged on the supporting part. The first side plate and the third side plate are arranged on the same side of the bottom plate, at least one first through hole is formed in the first side plate, a second through hole is formed in the third side plate, the first through hole and the second through hole are both located above the bottom plate, the supporting part is arranged on the bottom plate, and a hollow structure used for ventilation is arranged on the supporting part. Through the hollow structure of the supporting part, the air inlet efficiency and the freezing efficiency of the mesh belt can be improved; the string strip penetrates through the first through hole to be fixed to the second side plate, the whole string strip is located above the bottom plate, friction between the string strip and the connecting chain piece in the using process is avoided, and the service life of the string strip is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of food conveying, in particular to a connecting link and a conveyor belt with the same. Background Art

[0002] With the progress of science and the development of society, in the field of food processing, the hygiene and safety of food, the cleaning conditions of food machinery, production efficiency, etc. are becoming increasingly important. Currently, in food conveying, especially on the spiral conveyor belts of food machinery for food cooling and quick-freezing, the existing basic structure is: both sides of the conveyor belt are provided with link pieces, the link pieces are connected together by the middle string, the bottom supports the conveyor belt through the support track, and the conveyor belt is driven to run by the rotation of the middle drum and the friction with the conveyor belt. However, the side of the link piece is closed, the mesh surface is not easy to clean and can only be ventilated from the top, which greatly affects the freezing efficiency.

[0003] Although there are openings on the side of a part of the link pieces, which can improve the air inlet efficiency of the conveyor belt, the upper surface of the link pieces of the conveyor belt and the middle string are in point contact, and during use, the string is easily worn, affecting the service life of the string and the conveyor belt.

[0004] Therefore, there is a need for a connecting link and a conveyor belt with the same that can not only improve the air inlet efficiency and freezing efficiency of the conveyor belt, but also avoid friction with the string during use and improve the service life of the string. Summary of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a connecting link and a conveyor belt with the same.

[0006] The technical solution of the utility model is as follows:

[0007] A connecting link includes a connecting part and a supporting part. The connecting part includes a bottom plate, on which a first side plate, a second side plate and a third side plate are provided. The first side plate and the second side plate both extend upward along the edge of the bottom plate. The first side plate and the second side plate are arranged oppositely. The first side plate and the third side plate are arranged on the same side of the bottom plate. At least one first through hole is provided on the first side plate, and a second through hole is provided on the third side plate. Both the first through hole and the second through hole are located above the bottom plate. The supporting part is arranged on the bottom plate, and a hollow structure for ventilation is provided on the supporting part.

[0008] As a further improvement of the utility model, the first through hole is arranged at the bottom of the first side plate.

[0009] As a further improvement of the present utility model, a fourth side plate extending upward is provided at the edge of the bottom plate. The fourth side plate is perpendicular to the first side plate. An extension plate extending outward is provided at one end of the fourth side plate away from the bottom plate. The third side plate is provided on the extension plate.

[0010] As a further improvement of the present utility model, one of the first through holes is provided at the edge of the first side plate. The first through hole provided at the edge is a semi-hole, and the semi-hole and the fourth side plate limit a string bar.

[0011] As a further improvement of the present utility model, the support portion is a polygon formed by bending a metal bar. The top of the support portion is parallel to the bottom plate. The first end of the support portion is provided on the bottom plate, and the second end of the support portion is provided on the extension plate.

[0012] As a further improvement of the present utility model, at least one weight-reducing hole is provided on the bottom plate.

[0013] A conveyor belt includes a plurality of string bars arranged in parallel and a mesh belt wound around the plurality of string bars. Chain pieces are provided at both ends of the string bar. The chain pieces are used to connect two adjacent string bars. At least one end of the chain piece is the above-mentioned connecting chain piece. One string bar is inserted into a first through hole of one connecting chain piece and a second through hole of an adjacent connecting chain piece.

[0014] As a further improvement of the present utility model, a connecting chain piece is provided at the first end of the string bar, and a support chain piece is provided at the second end of the string bar. A third through hole and a fourth through hole are provided on the support chain piece. The third through hole and / or the fourth through hole is an elongated hole. One string bar is inserted into a third through hole of one support chain piece and a fourth through hole of an adjacent support chain piece.

[0015] As a further improvement of the present utility model, the support chain piece includes a first support plate and a second support plate connected to each other. The first support plate and the second support plate are arranged staggeredly along the axis direction of the string bar. The third through hole is provided on the first support plate, and the fourth through hole is provided on the second support plate.

[0016] As a further improvement of the present utility model, an extension portion extending away from the connecting chain piece along the axis direction of the string bar is provided at the lower end of the first support plate. A fixing portion extending upward is provided at one end of the extension portion away from the first support plate. One string bar sequentially passes through a fourth through hole of one support chain piece and a third through hole of an adjacent support chain piece, and is fixed on the fixing portion of the adjacent support chain piece.

[0017] According to the present utility model of the above solution, the beneficial effects of the present utility model are as follows:

[0018] Through the hollow structure of the support part, the present utility model can improve the air intake efficiency and freezing efficiency of the mesh belt; the string passes through the first through-hole and is fixed to the second side plate, and the whole string is located above the bottom plate, avoiding friction between the string and the connecting link during use and improving the service life of the string. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the connecting link of the present utility model;

[0020] Figure 2 is a schematic structural view of the connecting part of the present utility model;

[0021] Figure 3 is a schematic structural view of the conveyor belt of the present utility model;

[0022] Figure 4 is a partial enlarged view of part A of the present utility model;

[0023] Figure 5 is a schematic structural view of the support link of the present utility model at a first angle;

[0024] Figure 6 is a schematic structural view of the support link of the present utility model at a second angle.

[0025] In the figures: 1, string; 2, mesh belt; 3, connecting link; 31, connecting part; 311, bottom plate; 312, first side plate; 313, second side plate; 314, third side plate; 315, first through-hole; 316, second through-hole; 317, fourth side plate; 318, extension plate; 319, weight-reducing hole; 32, support part; 321, hollow structure; 4, support link; 41, first support plate; 42, second support plate; 43, third through-hole; 44, fourth through-hole; 45, extension part; 46, fixing part; 47, limiting part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present utility model fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] See Figure 1 and Figure 2, the present utility model provides a connecting link 3, which includes a connecting portion 31 and a supporting portion 32. The connecting portion 31 includes a bottom plate 311, and on the bottom plate 311, there are a first side plate 312, a second side plate 313 and a third side plate 314. Both the first side plate 312 and the second side plate 313 extend upward along the edge of the bottom plate 311. The first side plate 312 and the second side plate 313 are arranged oppositely. The first side plate 312 and the third side plate 314 are arranged on the same side of the bottom plate 311. Preferably, the bottom plate 311 is rectangular, having a first side, a second side, a third side and a fourth side, wherein the first side and the second side are arranged oppositely, the third side and the fourth side are arranged oppositely. The first side plate 312 and the third side plate 314 are arranged on the first side, the second side plate 313 is arranged on the second side. At least one first through hole 315 is provided on the first side plate 312, and a second through hole 316 is provided on the third side plate 314. Both the first through hole 315 and the second through hole 316 are located above the bottom plate 311. The supporting portion 32 is arranged on the bottom plate 311, and the supporting portion 32 is provided with a hollow structure 321 for ventilation. When connecting, one end of the string 1 sequentially passes through the second through hole 316 of a connecting link 3 and the first through hole 315 of an adjacent connecting link 3, and is finally fixed on the second side plate 313 of the adjacent connecting link 3. By providing the hollow structure 321 on the supporting portion 32, the present utility model can blow air horizontally from the side of the mesh belt 2, improving the air intake efficiency and freezing efficiency of the mesh belt 2; and during use, one end of the string 1 passes through the first through hole 315 and is fixed on the second side plate 313, and the whole string 1 is located above the bottom plate 311. In actual use, the upper and lower layers of connecting links 3 are stacked, that is, the bottom plate 311 of the connecting link 3 in the upper layer is stacked on the supporting portion 32 of the connecting link 3 in the lower layer, replacing the current situation where the string 1 is directly stacked on the supporting portion 32, avoiding unnecessary damage to the string 1 caused by friction between the string 1 and the connecting link 3 during use, and improving the service life of the string 1; although there is a certain amount of friction between the connecting links 3, which will cause damage to the connecting links 3 and require regular replacement, compared with replacing the string 1 when the string 1 is damaged, replacing the connecting link 3 has the advantages of convenient installation and fast replacement.

[0030] As an embodiment of the present utility model, the diameters of the first through hole 315 and the second through hole 316 are both slightly larger than the cross-sectional diameter of the string 1, which can not only facilitate the string 1 to pass through the first through hole 315 and the second through hole 316, improving the assembly efficiency, but also ensure that the string 1 can have a certain amount of movement space in the first through hole 315 and the second through hole 316, improving the working performance.

[0031] As an embodiment of the present utility model, the first through hole 315 is provided at the bottom of the first side plate 312. After the string bar 1 passes through the first through hole 315, the lower end of the string bar 1 can contact and be fixed to the bottom plate 311, so that the string bar 1 is fixedly connected to both the bottom plate 311 and the second side plate 313, effectively improving the connection strength between the string bar 1 and the connecting link 3.

[0032] As an embodiment of the present utility model, the first side plate 312 and the third side plate 314 are the same side plate, that is, both the first through hole 315 and the second through hole 316 are provided on the first side plate 312. Preferably, the first through hole 315 and the second through hole 316 are provided at the same height, which can ensure that two adjacent connecting links 3 are located at the same height after assembly, improving the overall assembly stability and practicality.

[0033] As an embodiment of the present utility model, the edge of the bottom plate 311 is provided with a fourth side plate 317 extending upward. The fourth side plate 317 is perpendicular to the first side plate 312, that is, the fourth side plate 317 is provided on the third side of the bottom plate 311. One end of the fourth side plate 317 far from the bottom plate 311 is provided with an extension plate 318 extending outward. That is, the bottom plate 311, the fourth side plate 317 and the extension plate 318 are combined into a stepped shape. The third side plate 314 is provided on the extension plate 318. When two connecting links 3 are combined and connected, the fourth side plate 317 can separate the bottom plate 311 from the adjacent connecting link 3, avoiding contact or friction between the bottom plate 311 or the string bar 1 connected to the bottom plate 311 and the adjacent connecting link 3, effectively avoiding unnecessary friction and damage to the connecting link 3 or the string bar 1, and improving the overall service life.

[0034] As an embodiment of the present utility model, a first through hole 315 is provided at the edge of the first side plate 312. The first through hole 315 provided at the edge is a half hole. The half hole and the fourth side plate 317 limit a string bar 1. The string bar 1 can be limited and fixed through the first through hole 315 and the fourth side plate 317. Without changing the distance between two adjacent first through holes 315, the size of the first side plate 312 can be effectively reduced, reducing the use cost.

[0035] As an embodiment of the present utility model, the fourth side plate 317 is an arc-shaped plate, and the radian of the fourth side plate 317 is the same as that of the first through hole 315. The fourth side plate 317 can better avoid and limit the string bar 1, ensuring the stable connection between the string bar 1 and the connecting link 3.

[0036] As an embodiment of the present utility model, the support portion 32 is a polygonal structure formed by bending a metal strip. The top of the support portion 32 is parallel to the bottom plate 311. The first end of the support portion 32 is disposed on the bottom plate 311, and the second end of the support portion 32 is disposed on the extension plate 318. Preferably, the first end and the second end of the support portion 32 are staggered along the axial direction of the string bar 1, and the staggering angle at both ends is 35 - 40°, optimally 38°, which can effectively enhance the lateral force-bearing strength of the support portion 32, reduce the risks such as inclination and collapse of the support portion 32, and enhance the overall stability. The overall polygonal structure can be in various shapes, having an opening between the first end and the second end, such as a rectangle, a triangle, a rhombus or other polygons. The top side of the polygon is parallel to the bottom of the connecting portion 31, preferably an inverted trapezoid, and the angle between the long side and the waist of the inverted trapezoid is 60 - 65°, optimally 63°, which can effectively enhance the force-bearing strength of the support portion 32 and reduce the risk of collapse. Preferably, the upper surface of the top of the support portion 32 is a plane, which can effectively increase the contact area between the support portion 32 and the bottom plate 311 of the upper connecting link 3, and improve the overall stability and safety.

[0037] As an embodiment of the present utility model, at least one weight-reducing hole 319 is provided on the bottom plate 311, which can effectively reduce the overall weight of the connecting link 3 and reduce the overall use cost; the weight-reducing hole 319 can further improve the air intake efficiency and freezing efficiency of the mesh belt 2; when the water vapor in the air liquefies into liquid water and adheres to the connecting link 3, the liquid water can drip through the weight-reducing hole 319, avoiding the long-term accumulation of liquid water on the bottom plate 311, causing deformation or other unnecessary damages to the bottom plate 311, and improving the service life of the connecting link 3.

[0038] See Figure 3 and Figure 4 As shown in and, the present utility model provides a conveyor belt, including a plurality of string bars 1 arranged in parallel and a mesh belt 2 wound around the plurality of string bars 1; both ends of the string bar 1 are provided with link pieces, and the link pieces are used to connect two adjacent string bars 1. At least one end of the link pieces is a connecting link 3. One string bar 1 is inserted into the first through hole 315 of a connecting link 3 and the second through hole 316 of an adjacent connecting link 3. When adjacent connecting links 3 are assembled, there are three adjacent string bars 1 in sequence, namely A, B, and C. Then A is inserted into the first through hole 315 of the first connecting link 3, B is inserted into the second through hole 316 of the first connecting link 3 and the first through hole 315 of the second connecting link 3, and C is inserted into the second through hole 316 of the second connecting link 3. The first connecting link 3 is connected to the previous connecting link 3 through A, and the second connecting link 3 is connected to the subsequent connecting link 3 through C. If it is necessary to add a third connecting link 3, a fourth connecting link 3 or even more connecting links 3, only need to assemble and add them in sequence according to the above method.

[0039] As an embodiment of the present utility model, a connecting link 3 is provided at the first end of the string bar 1, and a supporting link 4 is provided at the second end of the string bar 1. A third through hole 43 and a fourth through hole 44 are provided on the supporting link 4. A string bar 1 is inserted into the third through hole 43 of a supporting link 4 and the fourth through hole 44 of an adjacent supporting link 4. The third through hole 43 and / or the fourth through hole 44 are waist-shaped holes. Preferably, the fourth through hole 44 is a waist-shaped hole. The two adjacent supporting links 4 can move relative to each other, so that when the conveyor belt enters a curved section, the first support plate 41 and the second support plate 42 of the two adjacent supporting links 4 are staggered and overlapped without interference.

[0040] See Figure 5 and Figure 6 , as an embodiment of the present utility model, the supporting link 4 includes a connected first support plate 41 and a second support plate 42. The first support plate 41 and the second support plate 42 are staggered along the axial direction of the string bar 1. The third through hole 43 is provided on the first support plate 41. There is at least one third through hole 43. Preferably, there are two third through holes 43. The fourth through hole 44 is provided on the second support plate 42. When two adjacent supporting links 4 are staggered and overlapped, it can not only improve the success rate and working efficiency of the staggered overlap, but also perform effective limiting to avoid unnecessary influence caused by excessive overlap.

[0041] As an embodiment of the present utility model, an extension part 45 extending away from the connecting link 3 along the axial direction of the string bar 1 is provided at the lower end of the first support plate 41, and a fixing part 46 extending upward is provided at the end of the extension part 45 away from the first support plate 41; a string bar 1 sequentially passes through the fourth through hole 44 of a supporting link 4 and the third through hole 43 of an adjacent supporting link 4 and is fixed on the fixing part 46 of the adjacent supporting link 4. When adjacent supporting links 4 are assembled, there are 3 string bars 1 arranged adjacent to each other in sequence, which are D, E, and F respectively. Then D is inserted into the third through hole 43 of the first supporting link 4, E is inserted into the fourth through hole 44 of the first supporting link 4 and the third through hole 43 of the second supporting link 4, and F is inserted into the fourth through hole 44 of the second supporting link 4. The first supporting link 4 is connected to the previous supporting link 4 through D, and the second supporting link 4 is connected to the subsequent supporting link 4 through F; when it is necessary to add a third supporting link 4, a fourth supporting link 4 or even more supporting links 4, only need to assemble and add them in sequence according to the above method.

[0042] As an embodiment of the present utility model, a limiting portion 47 extending in a direction approaching the connecting link 3 along the axis of the string bar 1 is provided at the lower end of the second support plate 42. The limiting portion 47 is opposite to the extending portion 45 in direction, and both the limiting portion 47 and the extending portion 45 are inclined downward. When the upper and lower support link plates 4 are stacked, the top of the lower support link plate 4 is exactly stuck between the extending portion 45 and the limiting portion 47 of the upper support link plate 4, realizing the limitation of the support link plate 4, avoiding the phenomenon that the support link plate 4 deviates along the axis direction of the string bar 1, and improving the overall working stability and safety.

[0043] In summary, the present utility model provides a connecting link and a conveyor belt having the same. By providing a hollow structure 321 in the support portion 32, horizontal blowing can be performed from the side of the mesh belt 2, improving the air inlet efficiency and freezing efficiency of the mesh belt 2; and during use, the entire string bar 1 is located above the bottom plate 311, and the bottom plate 311 of the upper connecting link 3 is stacked on the support portion 32 of the lower connecting link 3, replacing the current situation where the string bar 1 is directly stacked on the support portion 32, avoiding unnecessary damage to the string bar 1 caused by friction between the string bar 1 and the connecting link 3 during use, and improving the service life of the string bar 1; compared with replacing the string bar 1 when the string bar 1 is damaged, replacing the connecting link 3 has the advantages of convenient installation and fast replacement; after the string bar 1 passes through the first through hole 315, the lower end of the string bar 1 can contact and be fixed to the bottom plate 311, so that the string bar 1 is fixedly connected to both the bottom plate 311 and the second side plate 312, effectively improving the connection strength between the string bar 1 and the connecting link 3; the fourth side plate 317 can separate the bottom plate 311 from the adjacent connecting link 3, avoiding contact or friction between the bottom plate 311 or the string bar 1 connected to the bottom plate 311 and the adjacent connecting link 3, effectively avoiding unnecessary friction and damage to the connecting link 3 or the string bar 1, and improving the overall service life; the string bar 1 can be limited and fixed through the half hole and the fourth side plate 317. Without changing the distance between two adjacent first through holes 315, the size of the first side plate 312 can be effectively reduced, reducing the use cost; the weight reduction hole 319 can effectively reduce the overall weight of the connecting link 3 and the overall use cost, further improving the air inlet efficiency and freezing efficiency of the mesh belt 2, and at the same time avoiding the long-term accumulation of liquid water on the bottom plate 311, causing deformation or other unnecessary damages to the bottom plate 311, and improving the service life of the connecting link 3; the extending portion 45 and the limiting portion 47 of the support link plate 4 can limit the lower support link plate 4, avoiding the phenomenon that the support link plate 4 deviates along the axis direction of the string bar 1, and improving the overall working stability and safety.

[0044] It should be emphasized that the above are only the preferred embodiments of the present utility model, and it is not limited to the present utility model in any form. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A connecting link, characterized in that: The invention comprises a connecting portion (31) and a supporting portion (32), wherein the connecting portion (31) comprises a bottom plate (311), wherein the bottom plate (311) is provided with a first side plate (312), a second side plate (313) and a third side plate (314), wherein the first side plate (312) and the second side plate (313) both extend upward along the edge of the bottom plate (311), and the first side plate (312) and the second side plate (313) are arranged opposite to each other, and the first side plate (312) and the second side plate (313) are arranged opposite to each other. The three side plates (314) are arranged on the same side of the bottom plate (311); the first side plate (312) is provided with at least one first through hole (315); the third side plate (314) is provided with a second through hole (316); the first through hole (315) and the second through hole (316) are both located above the bottom plate (311); the support portion (32) is arranged on the bottom plate (311); and the support portion (32) is provided with a hollow structure (321) for ventilation.

2. The connecting link according to claim 1, characterized in that: The first through hole (315) is arranged at the bottom of the first side plate (312).

3. The connecting link according to claim 1, characterized in that: The edge of the bottom plate (311) is provided with a fourth side plate (317) extending upward, the fourth side plate (317) is perpendicular to the first side plate (312), and an extension plate (318) extending outward is provided at one end of the fourth side plate (317) away from the bottom plate (311), and the third side plate (314) is arranged on the extension plate (318).

4. The connecting link according to claim 3, characterized in that: One of the first through holes (315) is arranged at the edge of the first side plate (312); the first through hole (315) arranged at the edge is a half hole; the half hole and the fourth side plate (317) limit a string (1).

5. The connecting link according to claim 3, characterized in that: The support portion (32) is a polygon formed by bending a metal strip, the top of the support portion (32) is parallel to the bottom plate (311), the first end of the support portion (32) is arranged on the bottom plate (311), and the second end of the support portion (32) is arranged on the extension plate (318).

6. The connecting link according to claim 1, characterized in that: At least one weight-reducing hole (319) is provided on the bottom plate (311).

7. A conveyor belt, characterized in that: The invention comprises a plurality of strings (1) arranged in parallel and a mesh belt (2) wound around the plurality of strings (1); a chain piece is provided at both ends of the string (1), and the chain piece is used to connect two adjacent strings (1); the chain piece at at least one end is a connecting chain piece (3) as claimed in any one of claims 1 to 6; and one string (1) is inserted into a first through hole (315) of one connecting chain piece (3) and a second through hole (316) of an adjacent connecting chain piece (3).

8. The conveyor belt according to claim 7, characterized in that: The first end of the string (1) is provided with the connecting chain (3), the second end of the string (1) is provided with a supporting chain (4), the supporting chain (4) is provided with a third through hole (43) and a fourth through hole (44), the third through hole (43) and / or the fourth through hole (44) being waist holes, and one string (1) is inserted into the third through hole (43) of one supporting chain (4) and the fourth through hole (44) of an adjacent supporting chain (4).

9. The conveyor belt according to claim 8, characterized in that: The supporting chain plate (4) comprises a first supporting plate (41) and a second supporting plate (42) which are connected to each other; the first supporting plate (41) and the second supporting plate (42) are arranged alternately along the axial direction of the string (1); the third through hole (43) is arranged on the first supporting plate (41); and the fourth through hole (44) is arranged on the second supporting plate (42).

10. The conveyor belt according to claim 9, characterized in that: The lower end of the first support plate (41) is provided with an extension portion (45) extending along the axis of the string (1) in a direction away from the connecting chain piece (3); the end of the extension portion (45) away from the first support plate (41) is provided with a fixing portion (46) extending upward; one of the string bars (1) passes through the fourth through hole (44) of one supporting chain piece (4) and the third through hole (43) of an adjacent supporting chain piece (4) in sequence, and is fixed on the fixing portion (46) of the adjacent supporting chain piece (4).

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