Quickly disassembled prefabricated distributed photovoltaic power station support system

Abstract

The utility model belongs to photovoltaic support technical field, concretely relates to a kind of prefabricated distributed photovoltaic power station support system of quick dismounting;Wherein fixed column is fixed on column bottom plate;Adjusting column is placed in fixed column, angle adjusting groove is opened in adjusting column top end, the triangular swivel head of angle adjusting head is installed in angle adjusting groove, U-shaped steel inclined beam is simultaneously installed in the U-shaped clamping groove of angle adjusting head, purlin clamping groove is equipped on U-shaped steel inclined beam, and U-shaped steel purlin is installed in it;Photovoltaic module clamp is placed in frame, and is fastened in frame by tension bolt, and tensioning piece is fixed in tension bolt bottom, and is slidably installed in U-shaped steel purlin;The utility model does not need welding cutting and a large number of bolt locking work on site, and the height of adjusting support column is realized according to design requirement without on-site machining, the angle that photovoltaic module overall accepts illumination, the system standardization modularization saves the manpower and material resources needed for distributed photovoltaic construction, reduces construction period, and the system material can realize nondestructive disassembly and realize reuse.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic support technology, specifically relating to a quick-assembly and disassembly prefabricated distributed photovoltaic power station support system. Background Technology

[0002] Distributed photovoltaic (PV) mounting systems, also known as solar panel supports, are specialized brackets used to install and support solar panels. They differ from traditional brackets in that PV mounting systems require customized design based on the size and shape of the solar panels to meet installation needs in different environments. PV mounting systems are fixed to the ground, roof, or other structures, maintaining the solar panels at a specific tilt angle to maximize solar radiation absorption. The main components of a PV mounting system include columns, main beams, purlins, welded components, and a foundation.

[0003] Currently, photovoltaic (PV) mounting systems on the market are mainly classified into three types based on their materials: concrete systems, steel systems, and aluminum alloy systems. They are also classified into fixed systems and tracking systems based on whether their angle can be freely adjusted. Fixed systems can be further subdivided into fixed systems and fixed adjustable systems, while tracking systems can be further subdivided into single-axis tracking systems and dual-axis tracking systems. Currently, fixed systems dominate the market. Traditional distributed PV fixed systems are mostly customized designs based on actual needs. On-site assembly requires on-site cutting and welding of the mounting materials, and there is a lack of unified standards, leading to some deviations from the final design requirements. Summary of the Invention

[0004] To overcome the above problems, this utility model provides a rapid disassembly and assembly prefabricated distributed photovoltaic power station support system. It is a distributed photovoltaic support system based on standardized prefabricated components combined with mortise and tenon joints. The system adopts a unified standard prefabricated component plus mortise and tenon joint structure design to achieve rapid installation and disassembly of the distributed photovoltaic support system during construction and non-destructive recycling operations, thereby achieving industry standardization of fixed photovoltaic support systems.

[0005] A quick-assembly and disassembly prefabricated distributed photovoltaic power station support system includes multiple adjustable support columns 1, U-shaped steel inclined beams 2, U-shaped steel purlins 3, expansion-type quick-connect clamp assemblies 4, and photovoltaic modules 5. The adjustable support column 1 includes a column base plate 11, a fixed column 13, an adjustable column 14, an angle adjustment shaft 15, and an angle adjustment head 16. The fixed column 13 is fixed to the column base plate 11. The adjustable column 14 is fitted inside the fixed column 13, and the adjustable column 14 and the fixed column 13 are fastened together by adjusting bolts 132. 4. An angle adjustment groove 144 is provided at the top. The top of the angle adjustment head 16 is a U-shaped slot 162 and the bottom is a triangular rotating head 161. The triangular rotating head 161 is installed in the angle adjustment groove 144 through the angle adjustment shaft 15 and is fastened by the angle adjustment locking bolt 143. The U-shaped steel inclined beam 2 is installed in the U-shaped slots 162 of the angle adjustment heads 16 of multiple adjustable support columns 1 and is locked by the inclined beam locking bolt 163. The U-shaped steel inclined beam 2 is provided with multiple purlin slots 21, and the purlin slots 21 are filled with U-shaped steel purlins 3.

[0006] The expandable quick-connect clip assembly 4 includes a photovoltaic module clip 41, a tensioning bolt 42, and a tensioning plate 43. The photovoltaic module 5 includes a frame 51 and a photovoltaic panel 52 fixed therein. The photovoltaic module clip 41 is placed inside the frame 51 and fastened inside the frame 51 by the tensioning bolt 42. The tensioning plate 43 is fixed to the bottom of the tensioning bolt 42 and slidably installed inside the U-shaped steel purlin 3.

[0007] The surface of the fixed column 13 has equal-spaced height adjustment bolt holes 131, and the surface of the adjustable column 14 has equal-spaced height adjustment bolt holes 141. After the adjustable column 14 is fitted into the fixed column 13, the adjusting bolt 132 passes through both the first height adjustment bolt hole 131 and the second height adjustment bolt hole 141 to fasten the adjustable column 14 and the fixed column 13.

[0008] The top of the adjusting column 14 is provided with an angle adjusting shaft hole 142, and the triangular rotating head 161 is provided with an angle adjusting shaft hole 164 and an angle indicator mark 165. The triangular rotating head 161 is placed in the angle adjusting groove 144, and the angle adjusting shaft 15 is sleeved in the corresponding angle adjusting shaft hole 142 and angle adjusting shaft hole 164. The angle adjusting locking bolt 143 passes through the side wall of the angle adjusting groove 144 and is connected to the triangular rotating head 161.

[0009] The angle adjustment groove 144 at the top of the adjustment column 14 has a through hole on its side wall for the angle adjustment locking bolt 143 to pass through.

[0010] The outer side wall at the top of the adjusting column 14 is provided with an angle pointer 145 that works in conjunction with the angle indicator mark 165.

[0011] The U-shaped slot 162 and the triangular rotating head 161 are integrally formed parts.

[0012] The U-shaped steel purlin 3 includes a U-shaped strip, wherein the two ends of the top opening of the U-shaped strip are respectively provided with downward-facing barbs, the bottom of the tensioning bolt 42 extends into the U-shaped strip, and the two ends of the tensioning plate 43 are respectively engaged with the barbs on both sides.

[0013] The beneficial effects of this utility model are:

[0014] The entire system of this utility model can be prefabricated before installation, eliminating the need for welding, cutting, and extensive bolt tightening on-site. The height of the support columns can be adjusted arbitrarily according to design requirements without on-site processing, allowing for precise control of the angle at which the photovoltaic modules receive sunlight. The mortise and tenon structure design enables rapid installation and disassembly of the distributed photovoltaic power station support system. The threaded holes on the photovoltaic module frame allow for robotic local bolt disassembly and tightening, enabling rapid disassembly and replacement of each photovoltaic module. The standardized and modular design of this system saves manpower and resources required for distributed photovoltaic construction, shortens the construction cycle, and allows for non-destructive disassembly and reuse of the system's materials. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the adjustable support column structure of this utility model.

[0018] Figure 3 This is a schematic diagram showing some structural details of the present invention.

[0019] Figure 4 This is a schematic diagram of the U-shaped steel inclined beam structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the expansion quick-connect card assembly of this utility model.

[0021] Figure 6 This is a schematic diagram of the photovoltaic module structure of this utility model.

[0022] Wherein: 1—Adjustable support column; 11—Column base plate; 12—Anchor bolt; 13—Fixed column; 131—Height adjustment bolt hole one; 132—Adjusting bolt; 14—Adjusting column; 141—Height adjustment bolt hole two; 142—Angle adjustment shaft hole one; 143—Angle adjustment locking bolt; 144—Angle adjustment groove; 145—Angle pointer; 15—Angle adjustment shaft; 16—Angle adjustment head; 161—Triangle rotor Head; 162—U-shaped slot; 163—Diagonal beam locking bolt; 164—Angle adjustment shaft hole two; 165—Angle indicator mark; 2—U-shaped steel inclined beam; 21—Purifier slot; 3—U-shaped steel purlin; 4—Expansion quick-connect clamp assembly; 41—Photovoltaic module clamp; 42—Tension bolt; 43—Tensioning plate; 5—Photovoltaic module; 51—Frame; 52—Photovoltaic panel; 53—Wrench mounting hole; 54—Bolt hole; 6—Fixed load-bearing foundation. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] Example 1

[0025] A rapid-assembly and disassembly prefabricated distributed photovoltaic power station support system, such as Figure 1-6 As shown, the system includes multiple adjustable support columns 1, U-shaped steel inclined beams 2, U-shaped steel purlins 3, expansion quick-connect clip assemblies 4, photovoltaic modules 5, and a fixed load-bearing foundation 6. The adjustable support column 1 includes a column base plate 11, a fixed column 13, an adjustable column 14, an angle adjustment shaft 15, and an angle adjustment head 16. The fixed column 13 is fixed to the column base plate 11, and the column base plate 11 is fixed to the fixed load-bearing foundation 6 by anchor bolts 12. The adjustable column 14 is fitted inside the fixed column 13, and the adjustable column 14 and the fixed column 13 are fastened together by adjusting bolts 132. The top of the adjusting column 14 has an angle adjusting groove 144, and the top of the angle adjusting head 16 is a U-shaped slot 162 and the bottom is a triangular rotating head 161. The triangular rotating head 161 is installed in the angle adjusting groove 144 through the angle adjusting shaft 15 and is fastened by the angle adjusting locking bolt 143. The U-shaped steel inclined beam 2 is installed in the U-shaped slots 162 of the angle adjusting heads 16 of multiple adjustable support columns 1 and is locked by the inclined beam locking bolt 163. The U-shaped steel inclined beam 2 is provided with multiple purlin slots 21, and the purlin slots 21 are filled with U-shaped steel purlins 3.

[0026] The expandable quick-connect clip assembly 4 includes a photovoltaic module clip 41, a tensioning bolt 42, and a tensioning plate 43. The photovoltaic module 5 includes a frame 51 and a photovoltaic panel 52 fixed therein. The top and bottom of the frame 51 are respectively provided with corresponding wrench mounting holes 53 and bolt holes 54. The photovoltaic module clip 41 is placed inside the frame 51 and is fastened inside the frame 51 by the tensioning bolt 42. The tensioning plate 43 is fixed to the bottom of the tensioning bolt 42 and is slidably installed inside the U-shaped steel purlin 3.

[0027] The surface of the fixed column 13 has equal-spaced height adjustment bolt holes 131, and the surface of the adjustable column 14 has equal-spaced height adjustment bolt holes 141. After the adjustable column 14 is fitted into the fixed column 13, the adjusting bolt 132 passes through both the first height adjustment bolt hole 131 and the second height adjustment bolt hole 141 to fasten the adjustable column 14 and the fixed column 13.

[0028] The top of the adjusting column 14 is provided with an angle adjusting shaft hole 142, and the triangular rotating head 161 is provided with an angle adjusting shaft hole 164 and an angle indicator mark 165. The triangular rotating head 161 is placed in the angle adjusting groove 144, and the two ends of the angle adjusting shaft 15 are respectively sleeved in the corresponding angle adjusting shaft hole 142 and angle adjusting shaft hole 164 to connect the triangular rotating head 161 and the adjusting column 14. The angle adjusting locking bolt 143 passes through the side wall of the angle adjusting groove 144 and is engaged with the triangular rotating head 161.

[0029] The angle adjustment groove 144 at the top of the adjustment column 14 has a through hole on one side wall for the angle adjustment locking bolt 143 to pass through.

[0030] The outer side wall at the top of the adjusting column 14 is provided with an angle pointer 145 that works in conjunction with the angle indicator mark 165.

[0031] The U-shaped slot 162 and the triangular rotating head 161 are integrally formed parts.

[0032] The U-shaped steel purlin 3 includes a U-shaped strip, wherein the two ends of the top opening of the U-shaped strip are respectively provided with downward-facing barbs, the bottom of the tensioning bolt 42 extends into the U-shaped strip, and the two ends of the tensioning plate 43 are respectively engaged with the barbs on both sides.

[0033] The working process of this utility model:

[0034] According to the design requirements, multiple adjustable support columns 1 are selected and arranged in multiple rows according to the required sequence. The base plates 11 of each adjustable support column 1 are then fixed to the corresponding fixed foundation 6 using anchor bolts 12. The height of the adjusting column 14 of each adjustable support column 1 is adjusted, i.e., the position of the adjusting column 14 within the fixed column 13 is adjusted, and fixed with adjusting bolts 132. The angle adjustment head 16 is adjusted relative to the adjusting column 14 as needed, and the triangular rotating head 161 is locked in place using angle adjustment locking bolts 143. After all adjustable support columns 1 are installed, U-shaped steel inclined beams 2 are fixed in the U-shaped slots 162 of the corresponding row of adjustable support columns 1, and locked in place using inclined beam locking bolts 163. Tighten the U-shaped steel inclined beam 2; multiple sets of U-shaped steel purlins 3 are respectively installed in the purlin slots 21 opened in the corresponding U-shaped steel inclined beam 2; then the expansion quick-connect clamp assembly 4 is installed in the bolt holes 54 of the frame 51 of the photovoltaic module 5 through the tension bolt 42, and the tensioning plate 43 installed at the bottom of the tension bolt 42 is slidably installed on the inner side of the U-shaped steel purlin 3. The tension bolt 42 nut is continuously tightened through the wrench mounting hole 53 on the frame 51, so that the tensioning plate 43 changes from bent to straight, fixing the frame 51 to the U-shaped steel purlin 3. At the same time, the tensioning plate 43 extends and supports the inside of the U-shaped steel purlin 3, so that the U-shaped steel purlin 3 is tightened in the purlin slots 21 of the U-shaped steel inclined beam 2 and cannot move. Finally, the photovoltaic module 5 is fixed to the U-shaped steel inclined beam 2 through the U-shaped steel purlin 3.

[0035] Example 2

[0036] Please see Figure 1 As shown, this utility model consists of an adjustable support column 1, a U-shaped steel inclined beam 2, a U-shaped steel purlin 3, an expansion quick-connect clamp assembly 4, a photovoltaic module 5, and a fixed load-bearing foundation 6. The adjustable support column 1 is composed of a column base plate 11, anchor bolts 12, a fixed column 13, an adjustable column 14, an angle adjustment shaft 15, and an angle adjustment head 16. The fixed column 13 has equally spaced height adjustment bolt holes 131 on its surface and is equipped with adjusting bolts 132. The adjustable column 14 has equally spaced height adjustment bolt holes 131 on its surface. The adjusting bolt hole 141 is adjusted, and the top of the adjusting column 14 is respectively provided with an angle adjusting shaft hole 142 and an angle adjusting groove 144. The top of the adjusting column 14 is also provided with an angle adjusting locking bolt 143 and an angle pointer 145. The angle adjusting head 16 is composed of a triangular rotating head 161, a U-shaped slot 162 and a diagonal beam locking bolt 163. The surface of the triangular rotating head 161 is provided with an angle adjusting shaft hole 164 and an angle indicator mark 165. The U-shaped steel diagonal beam 2 is provided with a purlin slot 21 according to the installation dimensions. The expansion quick-connect clamp assembly 4 includes a photovoltaic module clamp 41, a tensioning bolt 42, and a tensioning plate 43. The photovoltaic module 5 is composed of a frame 51 and a photovoltaic panel 52. The frame 51 is provided with a wrench mounting hole 53 and a bolt hole 54.

[0037] In summary, the adjustable support column 1 is fixed to the base plate 11 on the fixed foundation 6 by its anchor bolts 12. The fixed column 13 is welded to the base plate 11. The adjustable column 14 is built into the fixed column 13. The adjusting bolt 132 passes through both the first height adjusting bolt hole 131 and the second height adjusting bolt hole 141. The triangular rotating head 161 of the angle adjusting head 16 is rotatably installed in the angle adjusting groove 144 at the top of the adjustable column 14 through the angle adjusting shaft 15 passing through the first angle adjusting shaft hole 142 and the second angle adjusting shaft hole 164. The angle adjusting locking bolt 143 is used to lock the triangular rotating head 161 of the angle adjusting head 16. The U-shaped slot 162 is integrated with the triangular rotating head 161. Molded parts; during the assembly of distributed photovoltaic brackets, as needed, one U-shaped steel inclined beam 2 is simultaneously installed in the U-shaped slot 162 of the angle adjustment head 16 of multiple adjustable bracket columns 1. The angle adjustment head 16 of the adjustable bracket column 1 locks the U-shaped steel inclined beam 2 through the angle adjustment locking bolt 143; multiple sets of U-shaped steel purlins 3 are respectively installed in the purlin slot 21 opened in the multiple sets of U-shaped steel inclined beams 2; the expansion quick-connect clip assembly 4 is installed in the bolt hole 54 of the frame 51 of the photovoltaic module 5 through the tension bolt 42. At the same time, the photovoltaic module clip 41 is fixed to the inner side of the frame 51 of the photovoltaic module 5 through the tension bolt 42. The tensioning plate 43 installed at the bottom of the tension bolt 42 is slidably installed on the inner side of the U-shaped steel purlin 3.

[0038] The working process of this utility model is as follows: The adjustable support column 1 is prefabricated and assembled into a whole by a column base plate 11, a fixed column 13, an adjustable column 14, an angle adjustment shaft 15, and an angle adjustment head 16. According to the design requirements, before on-site installation, the height of each adjustable support column 1 is adjusted by adjusting the height of its adjusting column 14 and fixed with adjusting bolts 132. The angle of the adjusting head 16 relative to the adjusting column 14 is adjusted according to the angle pointer 145 and the angle indicator mark 165, and the triangular rotating head 161 is locked and fixed by the angle adjustment locking bolt 143. Then, the entire adjustable support column 1 is fixed to the fixed bearing foundation 6 by anchor bolts 12. After all the adjustable support columns 1 are installed, the U-shaped steel inclined beams 2 are fixed in groups in the U-shaped slots 162 of the adjustable support column 1, and the U-shaped steel inclined beams 2 are locked by the inclined beam locking bolts 163 of the angle adjustment head 16 of the adjustable support column 1. Multiple groups of U-shaped steel inclined beams 16 are then fixed in groups in the U-shaped slots 162 of the adjustable support column 1. The steel purlins 3 are respectively installed in the purlin slots 21 opened in the multiple sets of U-shaped steel inclined beams 2; then the expansion quick-connect clamp assembly 4 is installed in the bolt holes 54 of the frame 51 of the photovoltaic module 5 through the tension bolts 42. At the same time, the photovoltaic module clamp 41 is fixed to the inside of the frame 51 of the photovoltaic module 5 through the tension bolts 42. The tensioning plate 43 installed at the bottom of the tension bolts 42 is slidably installed on the inside of the U-shaped steel purlins 3. The installation is completed by using a wrench on the frame 51 of the photovoltaic module 5. The tension bolt 42 nut is continuously tightened through hole 53, causing the tension plate 43 to straighten from a bent state, thus fixing the frame 51 of the photovoltaic module 5 to the U-shaped steel purlin 3. At the same time, the tension plate 43 extends and supports the interior of the U-shaped steel purlin 3, so that the U-shaped steel purlin 3 is tightened within the purlin slot 21 of the U-shaped steel inclined beam 2 and cannot move. Finally, the photovoltaic module 5 is fixed to the U-shaped steel inclined beam 2 via the U-shaped steel purlin 3, and then the entire assembly is fixed to the adjustable bracket column 1 support structure via the U-shaped steel inclined beam 2.

[0039] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, any equivalent substitutions or modifications made by those skilled in the art based on the technical solution and the inventive concept of the present invention within the scope of the technical concept disclosed in the present invention shall all fall within the scope of protection of the present invention.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0041] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A quick dismounting prefabricated distributed photovoltaic power station support system, characterized in that, The system includes multiple adjustable support columns (1), U-shaped steel inclined beams (2), U-shaped steel purlins (3), expansion quick-connect clips (4), and photovoltaic modules (5); wherein the adjustable support column (1) includes a column base plate (11), a fixed column (13), an adjustable column (14), an angle adjustment shaft (15), and an angle adjustment head (16); wherein the fixed column (13) is fixed on the column base plate (11); the adjustable column (14) is fitted inside the fixed column (13), and the adjustable column (14) and the fixed column (13) are fastened by adjusting bolts (132); the top of the adjustable column (14) has an angle adjustment opening. The angle adjustment head (16) has a U-shaped groove (162) at the top and a triangular rotating head (161) at the bottom. The triangular rotating head (161) is installed in the angle adjustment groove (144) through the angle adjustment shaft (15) and is fastened by the angle adjustment locking bolt (143). The U-shaped steel inclined beam (2) is installed in the U-shaped groove (162) of the angle adjustment head (16) of multiple adjustable support columns (1) and is locked by the inclined beam locking bolt (163). The U-shaped steel inclined beam (2) is provided with multiple purlin grooves (21), and the purlin grooves (21) are filled with U-shaped steel purlins (3). The expansion quick-connect card assembly (4) includes a photovoltaic module clip (41), a tensioning bolt (42), and a tensioning plate (43). The photovoltaic module (5) includes a frame (51) and a photovoltaic panel (52) fixed therein. The photovoltaic module clip (41) is placed inside the frame (51) and fastened inside the frame (51) by the tensioning bolt (42). The tensioning plate (43) is fixed to the bottom of the tensioning bolt (42) and is slidably installed inside the U-shaped steel purlin (3).

2. The rapid assembly and disassembly prefabricated distributed photovoltaic power station support system according to claim 1, characterized in that, The surface of the fixed column (13) has equal-spaced height adjustment bolt holes 1 (131), and the surface of the adjustable column (14) has equal-spaced height adjustment bolt holes 2 (141). After the adjustable column (14) is placed inside the fixed column (13), the adjusting bolt (132) is inserted into both the height adjustment bolt hole 1 (131) and the height adjustment bolt hole 2 (141) to fasten the adjustable column (14) and the fixed column (13).

3. The rapid assembly and disassembly prefabricated distributed photovoltaic power station support system according to claim 1, characterized in that, The top of the adjusting column (14) is provided with an angle adjusting shaft hole one (142), and the triangular rotating head (161) is provided with an angle adjusting shaft hole two (164) and an angle indicator mark (165). The triangular rotating head (161) is placed in the angle adjusting groove (144), and the angle adjusting shaft (15) is sleeved in the corresponding angle adjusting shaft hole one (142) and angle adjusting shaft hole two (164). The angle adjusting locking bolt (143) passes through the side wall of the angle adjusting groove (144) and is connected to the triangular rotating head (161).

4. The rapid assembly and disassembly prefabricated distributed photovoltaic power station support system according to claim 1, characterized in that, The angle adjustment groove (144) at the top of the adjustment column (14) has a through hole on its side wall for the angle adjustment locking bolt (143) to pass through.

5. A rapid disassembly and assembly prefabricated distributed photovoltaic power station support system according to claim 3, characterized in that, An angle pointer (145) is provided on the outer side wall of the top of the adjusting column (14) for use with the angle indicator mark (165).

6. A rapid disassembly and assembly prefabricated distributed photovoltaic power station support system according to claim 1, characterized in that, The U-shaped slot (162) and the triangular rotating head (161) are integrally formed parts.

7. A rapid disassembly and assembly prefabricated distributed photovoltaic power station support system according to claim 1, characterized in that, The U-shaped steel purlin (3) includes a U-shaped bar, wherein the two ends of the top opening of the U-shaped bar are respectively provided with downward-facing barbs, the bottom of the tensioning bolt (42) extends into the U-shaped bar, and the two ends of the tensioning plate (43) are respectively engaged with the barbs on both sides.

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