Efficient-installation self-locking BIPV photovoltaic assembly

Abstract

The utility model discloses an efficient installation self-locking BI PV photovoltaic assembly, relates to the photovoltaic assembly installation technology field, and comprises a plurality of photovoltaic assemblies and a color steel tile, each photovoltaic assembly comprises an upper frame, a lower frame, a left frame, a right frame and a photovoltaic panel, two ends of the lower frame are respectively fixedly connected with the left frame and the right frame, the color steel tile is fixedly connected with the color steel tile, and the color steel tile is fixedly connected with the color steel tile. One end of the left frame is fixedly connected with the lower frame, the other end of the left frame is fixedly connected with the upper frame, the other end of the right frame is fixedly connected with the other end of the upper frame, and photovoltaic panels are clamped on the inner sides of the upper frame, the lower frame, the left frame and the right frame. The installation steps can be completed only by workers above the color steel tiles, no scaffold needs to be installed, cost is saved, the pressing plates are simple in structure and convenient to use, roof loads are reduced, and therefore the purposes of reducing structural pressure and prolonging the service life of a plant are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic module installation, in particular to a self-locking BIPV photovoltaic module for efficient installation. Background Technique

[0002] BIPV generally refers to building integrated photovoltaics, which is a new concept for applying solar power generation. Simply put, it is to install a solar photovoltaic power generation array on the outer surface of the building envelope structure to provide electricity. Most of the solar photovoltaic roofs in the BIPV photovoltaic module system are composed of multiple photovoltaic modules spliced together, but the splicing structure of the existing solar photovoltaic roofs is relatively simple.

[0003] For example, a BIPV photovoltaic module system is disclosed in the Chinese patent document with the publication number CN216672909U, which records that "each photovoltaic module is composed of multiple photovoltaic panels spliced together. One end of each purlin close to the photovoltaic module is provided with a first platform frame and a second platform frame. The top surface of the first platform frame is higher than the top surface of the second platform frame. First, tilt one end of the photovoltaic panel at a certain angle and connect it to the first platform frame on the first purlin, and then gradually flatten the photovoltaic panel so that the other end of the photovoltaic panel is connected to the second platform frame of the adjacent purlin. Because the height of each purlin at its position increases in sequence, multiple photovoltaic modules are inclined at a certain angle, and a water guide groove is provided on each photovoltaic panel". When it rains, the rainwater flows down along the photovoltaic panel in this BIPV photovoltaic module system, and the leaked rainwater is discharged through the water guide groove, so that the water leakage prevention performance of the BIPV photovoltaic module system is better.

[0004] However, combined with the existing technology, there are still the following defects or problems: the above BIPV photovoltaic module system is mainly suitable for back installation. At present, BIPV photovoltaic modules are mostly used on the top of factories, and the height from the ground is relatively large. The back installation method requires workers to install scaffolding close to the top of the factory; and the back installation requires high installation accuracy, which is not conducive to rapid construction, and the installation accuracy during front installation is lower than that during back installation. Provide a self-locking BIPV photovoltaic module for efficient installation to solve the problem that the BIPV is firmly installed on the color steel tile during front installation in the existing solar photovoltaic roof in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies existing in the prior art and propose a self-locking BIPV photovoltaic module for efficient installation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An efficiently installed self-locking BIPV photovoltaic module, comprising a photovoltaic module and a color steel tile. There are multiple said photovoltaic modules, and each photovoltaic module includes an upper frame, a lower frame, a left frame, a right frame and a photovoltaic panel. Both ends of the lower frame are respectively fixedly connected to the left frame and the right frame. The other end of the left frame is fixedly connected to the upper frame, and the other end of the right frame is fixedly connected to the other end of the upper frame. The upper frame, the lower frame, the left frame and the right frame are internally clamped with a photovoltaic panel. A pressing plate is fixedly installed on the upper surface of the color steel tile, and the upper frame and the lower frame are both clamped with the pressing plate;

[0008] The pressing plate includes a connecting plate. One side of the connecting plate is fixedly connected to a first vertical plate. The other end of the first vertical plate is fixedly connected to a transverse plate. The other end of the transverse plate is fixedly connected to a second vertical plate. A first protrusion is arranged at one end of the first vertical plate close to the transverse plate, and external teeth are arranged inside the second vertical plate;

[0009] A side opening is formed on the outer side wall of the upper frame. A clamping strip is arranged at the position of the upper frame where the side opening is located. The clamping strip is integrally formed with the upper frame. The first protrusion extends into the inside of the side opening, and the first protrusion is directly above the clamping strip. Internal teeth matching the external teeth are arranged inside the lower frame, and the external teeth are clamped with the internal teeth.

[0010] Preferably, a tile rib is fixedly connected to the upper surface of the color steel tile. Multiple pressing plates arranged at equal intervals are placed on the upper surface of the tile rib. One photovoltaic module is arranged between every two adjacent pressing plates. The outer wall of the pressing plate is threadedly connected with a first screw. Top blocks are arranged on both sides of the tile rib, and the top blocks are located on the lower surface of the pressing plate. The pressing plate is fixedly connected to the top blocks through the first screw.

[0011] Preferably, a lower opening is formed at the bottom of the internal teeth. A second protrusion matching the lower opening is arranged on the upper surface of the transverse plate, and the second protrusion extends into the lower opening.

[0012] Preferably, a lower fixing frame is arranged at the top of the upper frame. The lower fixing frame is integrally formed with the upper frame. The photovoltaic panel is located inside the lower fixing frame. An upper fixing frame is arranged at the top of the lower frame. The upper fixing frame is integrally formed with the lower frame. The other side of the photovoltaic panel is located inside the upper fixing frame.

[0013] Preferably, a sealing gasket is placed outside the lower fixing frame, and the sealing gasket is in contact with the inside of the adjacent upper fixing frame.

[0014] Preferably, the placement positions of the multiple photovoltaic modules increase successively according to the height of the tile rib.

[0015] Preferably, the color steel tile and the tile bone are integrally formed, the top block matches the tile bone, the upper surface of the top block is provided with convex strips, and the convex strips are in contact with the lower surface of the pressing plate.

[0016] Preferably, the upper surface of the color steel tile is fixedly connected with purlins, the purlins are arranged obliquely along the slope of the color steel tile, the placement positions of the plurality of photovoltaic modules increase in sequence according to the height of the purlins, the outer wall of the pressing plate is threadedly connected with second screws, the other ends of the second screws are threadedly connected with sliding block nuts, the sliding block nuts are located below the pressing plate, and upper sliding grooves are formed at the top of the purlins, and the sliding block nuts are slidably connected with the purlins through the upper sliding grooves.

[0017] The beneficial effects of the present utility model are as follows:

[0018] In the present utility model, through the design of the photovoltaic module, the pressing plate, the first screw and the top block, the lower frame increases the tooth surface meshed with the pressing plate, and the upper frame increases the side opening convenient for insertion, so that the photovoltaic module can be installed frontally, and the damaged photovoltaic module can be quickly removed and replaced with a new one, without the need to disassemble and assemble a series of photovoltaic modules again.

[0019] In short, the improved installation method is more convenient. Only workers need to complete the installation steps above the color steel tile, without the need to install a scaffolding, saving costs; and the pressing plate has a simple structure and is easy to use, reducing the roof load, so as to achieve the purpose of reducing the structural pressure and extending the service life of the factory building. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a self-locking BIPV photovoltaic module with efficient installation of the present utility model.

[0021] Figure 2 It is a schematic structural diagram of the color steel tile, the tile bone and the pressing plate of a self-locking BIPV photovoltaic module with efficient installation of the present utility model.

[0022] Figure 3 It is a schematic structural diagram of the pressing plate, the first screw and the top block of a self-locking BIPV photovoltaic module with efficient installation of the present utility model.

[0023] Figure 4 It is a schematic structural diagram of the pressing plate of a self-locking BIPV photovoltaic module with efficient installation of the present utility model.

[0024] Figure 5 It is a schematic structural diagram of the upper frame and the lower frame of a self-locking BIPV photovoltaic module with efficient installation of the present utility model.

[0025] Figure 6Schematic diagram of the color steel tile, tile rib, pressing plate, first screw, and top block of an efficiently installed self-locking BIPV photovoltaic module of the present utility model; at this time, the photovoltaic module is in the installed state.

[0026] Figure 7 Schematic diagram of the color steel tile, tile rib, pressing plate, first screw, and top block of an efficiently installed self-locking BIPV photovoltaic module of the present utility model; at this time, the photovoltaic module is in the state after installation.

[0027] Figure 8 Of an efficiently installed self-locking BIPV photovoltaic module of the present utility model Figure 7 Cross-sectional view at position A in

[0028] Figure 9 Schematic diagram of the structure of an efficiently installed self-locking BIPV photovoltaic module of the present utility model after installation.

[0029] Figure 10 Schematic diagram of the structure of Embodiment 2 of an efficiently installed self-locking BIPV photovoltaic module of the present utility model.

[0030] Reference numerals in the figure: 1, color steel tile; 2, tile rib; 3, pressing plate; 301, connecting plate; 302, first vertical plate; 303, cross plate; 304, second vertical plate; 305, first protrusion; 306, second protrusion; 307, external teeth;

[0031] 4, first screw; 5, top block; 501, rib;

[0032] 6, upper frame; 601, side opening; 602, clamping strip; 603, lower fixing frame;

[0033] 7, lower frame; 701, internal teeth; 702, upper fixing frame; 703, lower opening;

[0034] 8, left frame; 9, right frame; 10, photovoltaic panel; 11, sealing gasket; 12, purlin; 13, sliding block nut; 14, second screw. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0036] Embodiment 1, as shown in the attached Figure 1 to the attached Figure 9 shown:

[0037] An efficiently installed self-locking BIPV photovoltaic module, comprising a photovoltaic module and a color steel tile 1. There are multiple photovoltaic modules, and each photovoltaic module includes an upper frame 6, a lower frame 7, a left frame 8, a right frame 9 and a photovoltaic panel 10. Both ends of the lower frame 7 are fixedly connected to the left frame 8 and the right frame 9 respectively. The other end of the left frame 8 is fixedly connected to the upper frame 6, and the other end of the right frame 9 is fixedly connected to the other end of the upper frame 6. The photovoltaic panel 10 is clamped inside the upper frame 6, the lower frame 7, the left frame 8 and the right frame 9. A pressing plate 3 is fixedly installed on the upper surface of the color steel tile 1, and the upper frame 6 and the lower frame 7 are both clamped with the pressing plate 3;

[0038] The pressing plate 3 includes a connecting plate 301. One side of the connecting plate 301 is fixedly connected to a first vertical plate 302. The other end of the first vertical plate 302 is fixedly connected to a cross plate 303. The other end of the cross plate 303 is fixedly connected to a second vertical plate 304. A first protrusion 305 is arranged at one end of the first vertical plate 302 close to the cross plate 303, and external teeth 307 are arranged inside the second vertical plate 304;

[0039] A side opening 601 is formed on the outer side wall of the upper frame 6. A clamping strip 602 is arranged at the position of the upper frame 6 where the side opening 601 is located. The clamping strip 602 is integrally formed with the upper frame 6. The first protrusion 305 extends into the inside of the side opening 601, and the first protrusion 305 is directly above the clamping strip 602. Internal teeth 701 matching the external teeth 307 are arranged inside the lower frame 7, and the external teeth 307 are clamped with the internal teeth 701;

[0040] A lower opening 703 is formed at the bottom of the internal teeth 701. A second protrusion 306 matching the lower opening 703 is arranged on the upper surface of the cross plate 303, and the second protrusion 306 extends into the lower opening 703.

[0041] In the above technical solution, for the installation of the first photovoltaic module, first, the clamping strip 602 at the bottom of the upper frame 6 of the first photovoltaic module is clamped under the first protrusion 305 on the first pressing plate 3, and the first protrusion 305 is clamped into the side opening 601;

[0042] Regarding the other side of the first photovoltaic module, the external teeth 307 on the second second vertical plate 304 are meshed with the internal teeth 701 on the lower frame 7 of the first photovoltaic module. At the same time, the second protrusion 306 is clamped into the lower opening 703. Gradually lay the first photovoltaic module flat until the second pressing plate 3 presses on the tile rib 2 of the color steel tile 1, and tighten the first screw 4 so that the top block 5 is in contact with and fixed to the tile rib 2, thereby completing the installation of the first photovoltaic module;

[0043] Installation of the second photovoltaic module. Then, the gasket 11 is attached to the upper surface of the lower fixing frame 603 of the second photovoltaic module. The lower fixing frame 603 of the second photovoltaic module is snapped into the lower surface of the upper fixing frame 702 of the second photovoltaic module. At the same time, the clamping strip 602 at the bottom of the upper frame 6 of the second photovoltaic module is snapped under the first protrusion 305 on the second pressing plate 3, and the first protrusion 305 is snapped into the side opening 601.

[0044] Regarding the other side of the second photovoltaic module, the external teeth 307 on the third second vertical plate 304 are engaged with the internal teeth 701 on the lower frame 7 of the second photovoltaic module. At the same time, the second protrusion 306 is snapped into the lower opening 703. Gradually lay the second photovoltaic module flat until the third pressing plate 3 presses on the rib 2 of the color steel tile 1, and tighten the first screw 4 so that the top block 5 fits and is fixed to the rib 2. At this time, the gasket 11 fits with the upper surface of the upper fixing frame 702 of the first photovoltaic module, thus completing the installation of the second photovoltaic module.

[0045] As shown in the appendix Figure 1 to the appendix Figure 3 As shown, the upper surface of the color steel tile 1 is fixedly connected with ribs 2. Multiple equally spaced pressing plates 3 are placed on the upper surface of the ribs 2. A photovoltaic module is arranged between every two adjacent pressing plates 3. The outer wall of the pressing plate 3 is threadedly connected with a first screw 4. Top blocks 5 are arranged on both sides of the rib 2. The top blocks 5 are located on the lower surface of the pressing plate 3. The pressing plate 3 is fixedly connected with the top block 5 through the first screw 4.

[0046] In the above technical solution, regarding the installation of the pressing plate 3, first place the first pressing plate 3 at the position of the rib 2 of the color steel tile 1, place the top blocks 5 on both sides of the rib 2, and after tightening the first screw 4, the top blocks 5 fit with the rib 2 and fix the pressing plate 3 on the rib 2.

[0047] As shown in the appendix Figure 8 As shown, the top of the upper frame 6 is provided with a lower fixing frame 603. The lower fixing frame 603 is integrally formed with the upper frame 6. The photovoltaic panel 10 is located inside the lower fixing frame 603. The top of the lower frame 7 is provided with an upper fixing frame 702. The upper fixing frame 702 is integrally formed with the lower frame 7. The other side of the photovoltaic panel 10 is located inside the upper fixing frame 702.

[0048] In the above technical solution, the upper fixing frame 702 is in a "T" shape. One side of the upper fixing frame 702 is snap-connected to the photovoltaic panel 10, and the other side of the upper fixing frame 702 is directly above the lower fixing frame 603. The lower fixing frame 603 presses on the other side of the upper fixing frame 702.

[0049] As shown in the appendix Figure 5 to the appendix Figure 7As shown, a sealing gasket 11 is placed outside the lower fixing frame 603. The sealing gasket 11 is in contact with the inner side of the adjacent upper fixing frame 702. The placement positions of multiple photovoltaic modules increase successively according to the height of the tile ribs 2.

[0050] In the above technical solution, the sealing gasket 11 has elasticity and plays a buffering and sealing role between the lower fixing frame 603 and the upper fixing frame 702.

[0051] As attached Figure 3 As shown, the color steel tile 1 and the tile rib 2 are integrally formed. The top block 5 matches the tile rib 2. A convex strip 501 is arranged on the upper surface of the top block 5, and the convex strip 501 is in contact with the lower surface of the pressing plate 3.

[0052] In the above technical solution, through the design of the convex strip 501, it is ensured that it can still be fastened to the lower surface of the pressing plate 3 under the condition of thermal expansion and contraction.

[0053] The specific usage method and function of this embodiment:

[0054] When the utility model is in use, the installation of the pressing plate 3: First, place the first pressing plate 3 at the position of the tile rib 2 of the color steel tile 1, place the top block 5 on both sides of the tile rib 2, and after tightening the first screw 4, the top block 5 fits with the tile rib 2 and fixes the pressing plate 3 on the tile rib 2;

[0055] Please refer to the above structure and process Figure 1-3 .

[0056] The installation of the first photovoltaic module: Then, snap the card strip 602 at the bottom of the upper frame 6 of the first photovoltaic module under the first protrusion 305 on the first pressing plate 3, and the first protrusion 305 snaps into the side opening 601;

[0057] Regarding the other side of the first photovoltaic module, mesh the external teeth 307 on the second second vertical plate 304 with the internal teeth 701 on the lower frame 7 of the first photovoltaic module. At the same time, the second protrusion 306 snaps into the lower opening 703. Gradually lay the first photovoltaic module flat until the second pressing plate 3 presses on the tile rib 2 of the color steel tile 1, and tighten the first screw 4 so that the top block 5 fits with and is fixed to the tile rib 2, thereby completing the installation of the first photovoltaic module;

[0058] Please refer to the above structure and process Figure 1-9 .

[0059] The installation of the second photovoltaic module: Then, the sealing gasket 11 is attached to the upper surface of the lower fixing frame 603 of the second photovoltaic module, snap the lower fixing frame 603 of the second photovoltaic module into the lower surface of the upper fixing frame 702 of the second photovoltaic module. At the same time, the card strip 602 at the bottom of the upper frame 6 of the second photovoltaic module snaps under the first protrusion 305 on the second pressing plate 3, and the first protrusion 305 snaps into the side opening 601;

[0060] Regarding the other side of the second photovoltaic module, engage the external teeth 307 on the third second vertical plate 304 with the internal teeth 701 on the lower frame 7 of the second photovoltaic module. At the same time, insert the second protrusion 306 into the lower opening 703. Gradually lay the second photovoltaic module flat until the third pressure plate 3 presses on the rib 2 of the color steel tile 1, and tighten the first screw 4 so that the top block 5 fits and is fixed to the rib 2. At this time, the gasket 11 fits with the upper surface of the fixed frame 702 on the first photovoltaic module, thus completing the installation of the second photovoltaic module;

[0061] The photovoltaic modules are arranged along the rib 2 on the surface of the color steel tile 1 from top to bottom, with the height gradually decreasing, that is, the other end of each photovoltaic module is detachably connected to the photovoltaic module on another adjacent pressure plate 3.

[0062] For the above structure and process, please refer to Figure 1-9 。

[0063] Example 2, as shown in the appendix Figure 10 This is the second embodiment of the present invention, which is based on the previous embodiment:

[0064] The upper surface of the color steel tile 1 is fixedly connected with purlins 12, and the purlins 12 are arranged obliquely along the slope of the color steel tile 1. The placement positions of multiple photovoltaic modules increase in sequence according to the height of the purlins 12. The outer wall of the pressure plate 3 is threadedly connected with a second screw 14, and the other end of the second screw 14 is threadedly connected with a slide nut 13. The slide nut 13 is located below the pressure plate 3. The top of the purlin 12 is provided with an upper chute, and the slide nut 13 is slidably connected with the purlin 12 through the upper chute.

[0065] In the above technical solution, when there are no ribs 2 on the color steel tile 1, or when the installation structure of the roof is a BIPV structure such as a steel structure that requires a bracket, the purlins 12 can be used and cooperate with the pressure plate 3, the slide nut 13, and the second screw 14;

[0066] For the installation of the pressure plate 3, first place the pressure plate 3 on the upper surface of the purlin 12. At the same time, slide the slide nut 13 into the purlin 12 through the chute, and then tighten the second screw 14 to complete the installation of the pressure plate 3.

[0067] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present utility model.

Claims

1. An efficient self-locking BIPV photovoltaic module, comprising a photovoltaic module and a color steel tile (1), characterized in that: There are multiple photovoltaic modules, and the photovoltaic modules include an upper frame (6), a lower frame (7), a left frame (8), a right frame (9) and a photovoltaic panel (10). The two ends of the lower frame (7) are respectively fixedly connected to the left frame (8) and the right frame (9). The other end of the left frame (8) is fixedly connected to the upper frame (6). The other end of the right frame (9) is fixedly connected to the other end of the upper frame (6). The inner sides of the upper frame (6), the lower frame (7), the left frame (8) and the right frame (9) are clamped with the photovoltaic panel (10). The upper surface of the color steel tile (1) is fixedly installed with a pressure plate (3). The upper frame (6) and the lower frame (7) are clamped with the pressure plate (3). The pressing plate (3) comprises a connecting plate (301), one side of the connecting plate (301) is fixedly connected to a first vertical plate (302), the other end of the first vertical plate (302) is fixedly connected to a horizontal plate (303), the other end of the horizontal plate (303) is fixedly connected to a second vertical plate (304), one end of the first vertical plate (302) close to the horizontal plate (303) is provided with a first protrusion (305), and the inner side of the second vertical plate (304) is provided with external teeth (307); The outer side wall of the upper frame (6) is provided with a side opening (601); the upper frame (6) is provided with a clamping strip (602) at the side opening (601); the clamping strip (602) and the upper frame (6) are integrally formed; the first protrusion (305) extends to the inside of the side opening (601); the first protrusion (305) is located directly above the clamping strip (602); the inner side of the lower frame (7) is provided with inner teeth (701) matching the outer teeth (307); the outer teeth (307) and the inner teeth (701) are clamped with each other.

2. A self-locking BIPV photovoltaic module for efficient installation according to claim 1, characterized in that: The upper surface of the color steel tile (1) is fixedly connected to a tile frame (2), a plurality of equidistantly arranged pressure plates (3) are placed on the upper surface of the tile frame (2), a photovoltaic module is arranged between each two adjacent pressure plates (3), the outer wall of the pressure plate (3) is threadedly connected to a first screw (4), and top blocks (5) are arranged on both sides of the tile frame (2), the top blocks (5) are located on the lower surface of the pressure plate (3), and the pressure plate (3) is fixedly connected to the top blocks (5) by the first screw (4).

3. The self-locking BIPV photovoltaic module for efficient installation according to claim 1, characterized in that: A lower opening (703) is provided at the bottom of the inner tooth (701), and a second protrusion (306) matching the lower opening (703) is provided on the upper surface of the transverse plate (303), and the second protrusion (306) extends into the lower opening (703).

4. The self-locking BIPV photovoltaic module for efficient installation according to claim 3, characterized in that: A lower fixing frame (603) is arranged at the top of the upper frame (6), the lower fixing frame (603) and the upper frame (6) are integrally formed, the photovoltaic panel (10) is located on the inner side of the lower fixing frame (603), an upper fixing frame (702) is arranged at the top of the lower frame (7), the upper fixing frame (702) and the lower frame (7) are integrally formed, and the other side of the photovoltaic panel (10) is located on the inner side of the upper fixing frame (702).

5. A self-locking BIPV photovoltaic assembly for efficient installation according to claim 4, characterized in that: A sealing gasket (11) is placed on the outer side of the lower fixing frame (603), and the sealing gasket (11) is in contact with the inner side of the adjacent upper fixing frame (702).

6. A self-locking BIPV photovoltaic assembly for efficient installation according to claim 5, characterized in that: The placement positions of the plurality of photovoltaic modules are raised in sequence according to the height of the tile frame (2).

7. The self-locking BIPV photovoltaic module for efficient installation according to claim 2, characterized in that: The color steel tile (1) and the tile frame (2) are integrally formed, the top block (5) matches the tile frame (2), and a convex strip (501) is provided on the upper surface of the top block (5), and the convex strip (501) contacts the lower surface of the pressing plate (3).

8. The self-locking BIPV photovoltaic module for efficient installation according to claim 1, characterized in that: The upper surface of the color steel tile (1) is fixedly connected with a purlin (12), and the purlin (12) is arranged along the slope of the color steel tile (1). The placement positions of the plurality of photovoltaic modules are successively increased according to the height of the purlin (12). The outer wall of the pressure plate (3) is threadedly connected with a second screw (14), and the other end of the second screw (14) is threadedly connected with a slider nut (13). The slider nut (13) is located below the pressure plate (3). An upper slide groove is provided on the top of the purlin (12), and the slider nut (13) is slidably connected to the purlin (12) through the upper slide groove.

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