Installation structure of photovoltaic support and photovoltaic flexible support

Abstract

The utility model relates to an installation structure of a photovoltaic support and a photovoltaic flexible support. The installation structure of the photovoltaic support is used for connecting a photovoltaic frame and a steel cable, the installation structure comprises an upper pressing piece, a lower pressing piece and a supporting piece which are sequentially arranged from top to bottom, and the upper pressing piece, the lower pressing piece and the supporting piece are correspondingly provided with connecting holes restrained with connecting pieces. A clamping groove used for clamping and fixing a photovoltaic frame is formed between the upper pressing piece and the lower pressing piece, an inserting groove used for allowing a steel cable of the photovoltaic assembly to be inserted therein is formed between the supporting piece and the lower pressing piece, and the clamping groove and the inserting groove are both located beside the connecting hole. According to the design, the clamping groove formed by the upper pressing piece and the lower pressing piece can clamp and fix the photovoltaic frame, the probability that the frame shakes is reduced, the reliability of frame installation is improved, the inserting groove formed by the lower pressing piece and the supporting piece can achieve installation of the steel cable, and installation of the photovoltaic frame and the steel cable can be achieved at the same time through the installation structure. The operation is more convenient.

Description

Technical Field

[0001] This application relates to the field of photovoltaic support technology, and in particular to an installation structure for a photovoltaic support and a flexible photovoltaic support. Background Technology

[0002] Photovoltaic modules are typically mounted on support structures. Flexible photovoltaic support structures, however, are large-span, multi-span structures characterized by their large span and high clearance, making them suitable for complex terrains such as mountains and ponds. Compared to traditional fixed support structures, flexible support structures install photovoltaic panels on rows of steel cables, with rigid supports connecting both ends of the cables. This allows them to span complex terrains such as gullies, steep slopes, and streams, effectively improving land utilization. In areas with the same land area but increased span, the panel capacity of flexible support structures is approximately three times that of fixed support structures. They offer advantages such as large span, high clearance, and good crack resistance, and also provide ample space for cultivation at the base.

[0003] Currently, in flexible photovoltaic (PV) brackets, steel cables are fixed to the PV frame using U-bolts and connecting plates. The two threaded sections of the U-bolt are inserted into the connecting plate, and the U-bolt is fixed to the connecting plate by bolts. The PV frame is directly fixed to the connecting plate by bolts. Although bolts can achieve a certain degree of fixation for the PV frame, relying solely on bolt connections can lead to loosening of the bolts during long-term use, resulting in the risk of the frame falling off. Utility Model Content

[0004] Therefore, it is necessary to provide a flexible support installation structure that can increase the stability of the photovoltaic frame installation while realizing the installation of steel cables and photovoltaic frames.

[0005] This application provides a photovoltaic bracket mounting structure for connecting a photovoltaic frame and a steel cable. The mounting structure includes an upper pressure member, a lower pressure member, and a support member arranged sequentially from top to bottom. The upper pressure member, the lower pressure member, and the support member are respectively provided with connecting holes that constrain the connecting members. A clamping groove is formed between the upper pressure member and the lower pressure member to clamp and fix the photovoltaic frame. A slot is formed between the support member and the lower pressure member for the steel cable of the photovoltaic module to be inserted therein. The clamping groove and the slot are both located beside the connecting holes.

[0006] The clamping groove formed by the upper and lower clamping components can clamp and fix the photovoltaic frame, reducing the probability of frame wobbling and improving the reliability of frame installation. The slot formed by the lower clamping component and the support component can be used to install the steel cable. Through the above installation structure, the photovoltaic frame and steel cable can be installed at the same time, which is more convenient.

[0007] In one embodiment, the support member has an upward-facing cavity, and the slot is formed between the cavity and the pressing member.

[0008] In one embodiment, the lower pressure member includes two connecting plates spaced apart along the length of the steel cable and an arched plate connecting the two connecting plates. The longitudinal section of the arched plate is n-shaped. The connecting hole on the lower pressure member is located on the top plate of the arched plate. The clamping groove is formed between the connecting plate and the upper pressure member.

[0009] In one embodiment, the support member is positioned corresponding to the arched plate, and a portion of the support member contacts the connecting plate. The portion of the support member is bent downward to form a bent portion, and the top surface of the bent portion forms the cavity. The support member includes two extension plates spaced apart along a direction intersecting the length direction of the steel cable. The bent portion is located between the two extension plates, and the two sides of the bent portion are respectively connected to the extension plates on the corresponding sides. The connecting holes on the support member are located on the extension plates.

[0010] Understandably, creating a recessed cavity on the top surface of the support member necessitates ensuring the thickness of the support member, which could result in some sections of the extension plate being excessively thick. However, by forming this cavity through bending, the excessive thickness of subsequent extension plates is prevented from affecting their connection, while simultaneously ensuring the integrity of the support member.

[0011] In one embodiment, the upper pressure member includes a clamping plate, a side plate, and a bottom plate connected sequentially along the length of the steel cable. The clamping plate is located above the corresponding side extension plate and is arranged side-by-side with the extension plate to form the clamping groove. At least one of the connecting plate and the clamping plate has a mounting hole corresponding to the photovoltaic frame and constrained by the mounting member. The side plate is arranged vertically, and the top edge of the side plate is connected to the corresponding side edge of the clamping plate. The bottom edge of the side plate is connected to the side edge of the bottom plate. The bottom plate is arranged side-by-side with the top plate of the arched plate. The connecting hole on the upper pressure member is located on the bottom plate.

[0012] In one embodiment, there are two side plates arranged side by side at intervals along the length of the steel cable. The bottom plate is located between the two side plates and forms a U-shaped intermediate plate with the two side plates. Each side plate is connected to a clamping plate. The two clamping plates form the clamping groove with the extension plate on the corresponding side. The intermediate plate is located between the two clamping grooves.

[0013] Understandably, the existence of the two slots facilitates the installation of two adjacent photovoltaic frames.

[0014] In one embodiment, a vertical plate extends downward from the side edge of the base plate away from the side plate, and a horizontal plate extends from the bottom edge of the vertical plate away from the base plate along the length direction of the steel cable. The vertical plate matches the outer side surface of the arched plate, and the bottom surface of the horizontal plate matches the top surface of the connecting plate.

[0015] In one embodiment, the bottom surface of the clamping plate and / or the top surface of the connecting plate are provided with anti-slip parts.

[0016] In one embodiment, the bottom surface of the clamping plate and / or the top surface of the connecting plate are provided with a limiting portion at a position away from the base plate to prevent the photovoltaic frame from disengaging from the clamping groove.

[0017] This application also provides a photovoltaic flexible support, including a steel cable and the installation structure described in any of the above embodiments. The installation structure is at least three sets and is arranged at intervals along the length direction of the steel cable. The installation structure located on both sides is defined as the first installation structure, and the installation structure located between two first installation structures is defined as the second installation structure. Each second installation structure has two clamping slots. The openings of the two clamping slots in the second installation structure are located on the side away from each other. Each first installation structure has one clamping slot, and the openings of the two clamping slots located on both sides are located on the side facing each other.

[0018] Understandably, the presence of three installation structures allows for the installation of multiple photovoltaic frames, increasing the overall reliability of the installation.

[0019] Compared with the prior art, the installation structure provided in this application has a clamping groove formed by the upper and lower pressure members to clamp and fix the photovoltaic frame, reducing the probability of frame shaking and improving the reliability of frame installation. The slot formed by the lower pressure member and the support member can be used to install the steel cable. The above installation structure can realize the installation of photovoltaic frame and steel cable at the same time, which is more convenient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a flexible support according to an embodiment of this application;

[0022] Figure 2 for Figure 1 A magnified view of a section at point I;

[0023] Figure 3 for Figure 1 Enlarged view of a section at point II;

[0024] Figure 4 for Figure 1 A schematic diagram of the first installation structure in the middle;

[0025] Figure 5 for Figure 4 A schematic diagram of the three-dimensional exploded structure;

[0026] Figure 6 for Figure 1 A three-dimensional exploded view of the second installation structure.

[0027] Reference numerals: 1. Upper pressure component; 11. Clamping plate; 111. Hook; 12. Side plate; 13. Bottom plate; 14. Vertical plate; 15. Horizontal plate; 2. Lower pressure component; 21. Connecting plate; 210. Mounting hole; 22. Arched plate; 221. Top plate; 3. Support component; 31. Bending part; 310. Cavity; 32. Extension plate; 4. Clamping groove; 5. Steel cable; 6. Slot; 7. Connecting hole; 8. Anti-slip part; 91. Connecting component; 92. Mounting component; 01. First mounting structure; 02. Second mounting structure. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "side," "top," "bottom," and similar expressions used in this application's specification are merely for describing various exemplary structural parts and elements of this application. However, their use herein is for illustrative purposes only and is determined based on the exemplary orientations shown in the accompanying drawings, and does not represent the only possible implementation. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating orientation are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may be at an angle to the axial direction.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0034] like Figures 1-6 As shown, this application provides an installation structure for a photovoltaic bracket. Figure 1 As shown, this mounting structure is used to connect the photovoltaic frame and the steel cable 5. Figures 2-6 As shown, the installation structure includes an upper pressure member 1, a lower pressure member 2, and a support member 3 arranged sequentially from top to bottom. The upper pressure member 1, lower pressure member 2, and support member 3 each have corresponding connecting holes 7 that constrain the connecting member 91. A clamping groove 4 is formed between the upper pressure member 1 and the lower pressure member 2 to hold and fix the photovoltaic frame, and a slot 6 is formed between the support member 3 and the lower pressure member 2 for inserting the steel cable 5 of the photovoltaic module. Both the clamping groove 4 and the slot 6 are located beside the connecting holes 7. The connecting member 91 is a bolt or screw.

[0035] It is understandable that the clamping groove 4 formed by the upper pressing member 1 and the lower pressing member 2 can clamp and fix the photovoltaic frame, reduce the probability of frame shaking, and improve the reliability of frame installation. The slot 6 can realize the installation of steel cable 5. The installation structure can simultaneously realize the installation of photovoltaic frame and steel cable 5.

[0036] In one implementation, such as Figure 5 and Figure 6 As shown, the bottom of the pressing member 2 is recessed upward to form a cavity 310. In this embodiment, the support member 3 has an upward-facing cavity 310, and a slot 6 is formed between the cavity 310 and the pressing member 2.

[0037] It is understandable that forming a cavity 310 on the support member 3 avoids affecting the strength of the pressure member 2, ensuring the reliability of the photovoltaic frame clamping, thus increasing the reliability of the photovoltaic frame installation.

[0038] like Figures 2-4 As shown, the support member 3 is positioned corresponding to the arched plate 22, and a portion of the support member 3 contacts the connecting plate 21. A portion of the support member 3 bends downward to form a bent portion 31, and the top surface of the bent portion 31 forms the aforementioned cavity 310. The direction intersecting the length direction of the steel cable 5 is defined as the first direction A, and the length direction of the steel cable 5 is defined as the second direction B. The support member 3 includes two extension plates 32 spaced apart along the first direction A. The bent portion 31 is located between the two extension plates 32, and both sides of the first portion are connected to the corresponding extension plates 32. In other words, the support member 3 is in the form of a clamp.

[0039] It is understandable that forming a recessed cavity 310 on the top surface of the support member 3 requires ensuring the thickness of the support member 3, which would result in some parts of the extension plate 32 being too thick. However, by bending to form the aforementioned cavity 310, the excessive thickness of the subsequent extension plate 32 is avoided, which would affect the connection of the subsequent extension plates 32, while ensuring the integrity of the support member 3.

[0040] The aforementioned pressing member 2 includes two connecting plates 21 spaced apart along the length of the steel cable 5 and an arched plate 22 connecting the two connecting plates 21. The arched plate 22 has an n-shaped longitudinal section, and a portion of the top surface of the aforementioned extension plate 32 contacts the bottom surface of the connecting plates 21. The connecting hole 7 on the pressing member 2 is located on the top plate 221 of the arched plate 22, and the connecting hole 7 of the support member 3 is located on the extension plate 32.

[0041] It is understandable that the presence of the arched plate 22, and the corresponding connection holes 7 on the top plate 221 of the arched plate 22 and the extension plate 32 of the upper pressure member 1 and the support member 3 constraining the connector 91, cause the arched plate 22 to deform during the pre-tightening process of the connector 91, increasing the pre-tightening force. At the same time, since the extension plate 32 is in contact with the connecting plate 21 of the arched plate 22, the extension plate 32 presses the connecting plate 21 upward during the pre-tightening process of the connector 91, increasing the clamping force on the photovoltaic frame.

[0042] The upper pressure member 1 includes a clamping plate 11, a side plate 12, and a bottom plate 13 connected sequentially along the length of the steel cable 5. The side plate 12 is vertically arranged, with its top edge connected to the corresponding side edge of the clamping plate 11, and its bottom edge connected to the side edge of the bottom plate 13. The bottom plate 13 is arranged side-by-side with the top plate 221 of the arched plate 22. The connecting hole 7 on the upper pressure member 1 is located on the bottom plate 13. The clamping plate 11 is located above the corresponding side extension plate 32 and is arranged side-by-side with the extension plate 32 at intervals to form the aforementioned clamping groove 4. That is, the clamping plate 11 and the extension plate 32 are the two groove plates of the clamping groove 4. At least one of the two groove plates has a mounting hole 210 constrained by a mounting member 92, which is a screw or bolt. In one embodiment, the mounting hole 210 is located on the clamping plate 11. In this embodiment, the mounting hole 210 is located on the connecting plate 21.

[0043] It is understandable that when the photovoltaic frame is inserted into the clamping groove 4, while the clamping groove 4 clamps and positions the photovoltaic frame, the mounting part 92 passes through the mounting hole 210 to make the photovoltaic frame more reliably installed in the clamping groove 4.

[0044] Furthermore, the aforementioned mounting hole 210 is a strip-shaped hole extending along the first direction A. The location of the strip-shaped hole can be selected based on the position of the mounting hole 210 on the photovoltaic frame. In one embodiment, there is one mounting hole 210; in this embodiment, there are two mounting holes 210, arranged at intervals along the first direction A.

[0045] In one embodiment, an anti-slip portion 8 is provided on the bottom surface of the clamping plate 11 or the top surface of the connecting plate 21. In this embodiment, both the bottom surface of the clamping plate 11 and the top surface of the connecting plate 21 are provided with anti-slip portions 8. The mounting hole 210 is located on the outside of the anti-slip portion 8. The anti-slip portion 8 can be an anti-slip texture or an anti-slip protrusion.

[0046] The presence of the aforementioned anti-slip part 8 increases the friction between the photovoltaic frame and the inner wall of the groove 4, which reduces the stability of the photovoltaic frame during long-term use.

[0047] Additionally, a limiting portion is provided on the bottom surface of the clamping plate 11 or the top surface of the connecting plate 21 at a position away from the base plate 13 to prevent the photovoltaic frame from disengaging from the clamping groove 4. In one embodiment, the limiting portion is formed on the top surface of the connecting plate 21 and extends upward. In this embodiment, the limiting portion is a hook 111 formed on the side edge of the clamping plate 11 away from the U-shaped plate and extending downward.

[0048] The first structural form of the upper pressure component 1 in the installation structure: There are two side plates 12, arranged side by side at intervals along the length of the steel cable. The bottom plate 13 is located between the two side plates 12, forming a U-shaped intermediate plate with the two side plates 12. Each side plate 12 is connected to a clamping plate 11. The two clamping plates 11 form a clamping groove 4 with the extension plate 32 on the corresponding side, and the intermediate plate is located between the two clamping grooves 4. It can be understood that the existence of the two clamping grooves 4 facilitates the installation of two adjacent photovoltaic frames.

[0049] In this embodiment, the upper pressure member 1, the lower pressure member 2, and the support member 3 are integrally formed parts. It can be understood that using an integral part ensures the strength of the upper pressure member 1, the lower pressure member 2, and the support member 3 at each connection point.

[0050] The second structural form of the upper pressure member 1 in the installation structure: the bottom plate 13 extends downward from the side edge away from the side plate 12 to form a vertical plate 14, the bottom edge of the vertical plate 14 extends along the length direction of the steel cable 5 away from the bottom plate 13 to form a horizontal plate 15, the vertical plate 14 matches the outer side of the arch plate 22, and the bottom surface of the horizontal plate 15 matches the top surface of the connecting plate 21.

[0051] Understandably, this allows for the installation of a single photovoltaic frame. Furthermore, the vertical plate 14 matches the outer surface of the arched plate 22, and the bottom surface of the horizontal plate 15 matches the top surface of the connecting plate 21, which helps improve the reliability of the connection between the upper pressure member 1 and the lower pressure member 2.

[0052] This application also provides a flexible photovoltaic support structure. The flexible photovoltaic support structure includes a steel cable 5 and the aforementioned mounting structure. There are at least three sets of mounting structures, spaced apart along the length of the steel cable 5. The mounting structures located on both sides are designated as first mounting structures 01, and there are two first mounting structures 01. The mounting structure located between the two first mounting structures 01 is defined as a second mounting structure 02. In one embodiment, there is one second mounting structure 02. In another embodiment, there are two, three, or more second mounting structures 02. The second mounting structure 02 has two clamping slots 4, with the openings of the two clamping slots 4 on the side facing away from each other. Each of the two first mounting structures 01 has one clamping slot 4, with the openings of the two clamping slots 4 on both sides facing each other. In this embodiment, the upper pressure member 1 in the middle second mounting structure 02 adopts the first structural form described above, and the upper pressure members 1 in the first mounting structures 01 on both sides adopt the second structural form described above.

[0053] Understandably, the existence of three sets of installation structures allows for the installation of multiple photovoltaic frames, increasing the overall reliability of the installation.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A photovoltaic bracket mounting structure for connecting a photovoltaic frame and a steel cable (5), characterized in that, The installation structure includes an upper pressure member (1), a lower pressure member (2), and a support member (3) arranged sequentially from top to bottom. The upper pressure member (1), the lower pressure member (2), and the support member (3) are respectively provided with connecting holes (7) that constrain the connector (91). A clamping groove (4) is formed between the upper pressure member (1) and the lower pressure member (2) to clamp and fix the photovoltaic frame. A slot (6) is formed between the support member (3) and the lower pressure member (2) for inserting a steel cable (5). The clamping groove (4) and the slot (6) are both located on the side of the connecting hole (7).

2. The installation structure according to claim 1, characterized in that, The support member (3) has an upward-facing recessed cavity (310), and the slot (6) is formed between the recessed cavity (310) and the pressing member (2).

3. The installation structure according to claim 2, characterized in that, The lower pressure member (2) includes two connecting plates (21) spaced apart along the length of the steel cable (5) and an arched plate (22) connecting the two connecting plates (21). The longitudinal section of the arched plate (22) is n-shaped. The connecting hole (7) on the lower pressure member (2) is located on the top plate (221) of the arched plate (22). The clamping groove (4) is formed between the connecting plate (21) and the upper pressure member (1).

4. The installation structure according to claim 3, characterized in that, The support member (3) is positioned corresponding to the arched plate (22), and a portion of the support member (3) is in contact with the connecting plate (21). A portion of the support member (3) is bent downward to form a bent portion (31), and the top surface of the bent portion (31) forms the cavity (310). The support member (3) includes two extension plates (32) spaced apart along a direction intersecting the length direction of the steel cable (5). The bent portion (31) is located between the two extension plates (32), and the two sides of the bent portion (31) are respectively connected to the corresponding side extension plates (32). The connecting hole (7) on the support member (3) is located on the extension plate (32).

5. The installation structure according to claim 4, characterized in that, The upper pressure member (1) includes a clamping plate (11), a side plate (12), and a bottom plate (13) connected sequentially along the length of the steel cable (5). The clamping plate (11) is located above the corresponding side extension plate (32) and is arranged side by side with the extension plate (32) to form the clamping groove (4). At least one of the connecting plate (21) and the clamping plate (11) has a mounting hole (210) corresponding to the photovoltaic frame and constrained by the mounting member (92). The side plate (12) is arranged vertically, and the top edge of the side plate (12) is connected to the corresponding side edge of the clamping plate (11). The bottom edge of the side plate (12) is connected to the side edge of the bottom plate (13). The bottom plate (13) is arranged side by side with the top plate (221) of the arched plate (22). The connecting hole (7) on the upper pressure member (1) is located on the bottom plate (13).

6. The installation structure according to claim 5, characterized in that, There are two side plates (12), which are arranged side by side at intervals along the length of the steel cable (5). The bottom plate (13) is located between the two side plates (12) and forms a U-shaped intermediate plate with the two side plates (12). Each side plate (12) is connected to a clamping plate (11). The two clamping plates (11) form the clamping groove (4) with the extension plate (32) on the corresponding side. The intermediate plate is located between the two clamping grooves (4).

7. The installation structure according to claim 5, characterized in that, A vertical plate (14) extends downward from the side edge of the base plate (13) away from the side plate (12). A horizontal plate (15) extends from the bottom edge of the vertical plate (14) away from the base plate (13) along the length direction of the steel cable (5). The vertical plate (14) matches the outer side surface of the arched plate (22), and the bottom surface of the horizontal plate (15) matches the top surface of the connecting plate (21).

8. The installation structure according to claim 7, characterized in that, The bottom surface of the clamping plate (11) and / or the top surface of the connecting plate (21) are provided with anti-slip parts (8).

9. The installation structure according to claim 5, characterized in that, The bottom surface of the clamping plate (11) and / or the top surface of the connecting plate (21) are provided with a limiting part at a position away from the base plate (13) to restrict the photovoltaic frame from disengaging from the clamping groove (4).

10. A photovoltaic flexible support, comprising a steel cable (5) and an installation structure according to any one of claims 1 to 5, characterized in that, The installation structure has at least three sets and is arranged at intervals along the length of the steel cable (5). The installation structures located on both sides are defined as first installation structures (01), and the installation structure located between two first installation structures (01) is defined as second installation structure (02). Each second installation structure (02) has two clamping slots (4). The openings of the two clamping slots (4) of the second installation structure (02) are located on the side away from each other. Each first installation structure (01) has one clamping slot (4). The openings of the two clamping slots (4) located on both sides are located on the side facing each other.

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