A photovoltaic support connection node with limiting connecting pieces

Abstract

This invention relates to the field of photovoltaic integration on metal roofs of steel structure buildings, specifically a photovoltaic support connection node with a limiting connecting piece, comprising a limiting connecting piece, an inner connecting piece, an open keel, a component frame, connecting bolts, and a frame clamping block; wherein the component frame is arranged perpendicularly to the open keel, and the component frame is placed on the upper part of the open keel or the limiting connecting piece, and the upper part of adjacent component frames is provided with a frame clamping block and fastened together by connecting bolts. By adopting the above technical solution, the technical problems of traditional connection nodes being prone to slippage, loosening, and torsional damage under strong winds and wind vibration are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic integration on metal roofs of steel structure buildings, and specifically to a photovoltaic support connection node with limiting connection pieces. Background Technology

[0002] Metal roofs on steel-structured buildings have become an important application scenario for distributed solar power stations. Traditional photovoltaic systems are often connected to roofs using metal rails and point-type clamping blocks, which presents the following prominent problems in practical applications: First, the small cross-section of the open U-shaped steel guide rail results in weak load-bearing capacity and stiffness, making it prone to localized instability under strong winds. Second, the photovoltaic module frame clamps are only fixed to the guide rails with bolts. Under wind-induced fatigue loads and guide rail deflection, the limitations of this bolt fixing method lead to poor anti-slip performance and node stability, easily causing loosening of the connection nodes and clamp failure, ultimately resulting in wind-induced damage to the modules. Third, the aluminum profile frame of the photovoltaic modules has a thin-walled, asymmetrical cross-section, resulting in poor structural stiffness and stability. Under wind loads, bulging of the photovoltaic panels can cause out-of-plane torsion of the frame, easily leading to frame damage or clamp slippage, resulting in overall failure of the module components and connection nodes. In coastal typhoon areas, numerous photovoltaic power plants have already suffered wind-induced damage due to these problems, causing significant economic and property losses.

[0003] Improving the load-bearing capacity of photovoltaic system module frames and the anti-slip and anti-loosening performance of connection nodes, thereby enhancing the overall stability of the nodes, is the main technical approach to solving the problem of photovoltaic systems' resistance to strong winds.

[0004] Therefore, the inventors conducted further research and developed a photovoltaic bracket connection node with limiting connecting pieces. Through structural innovations such as the dual connection of the top pressure block and the bottom limiting of the component frame, the joint force-bearing of the adjacent frame cross sections, and the formation of a closed cross section at the connection node by the open keel, the technical problem of traditional connection nodes being prone to slippage, loosening, and torsional damage under strong wind and wind vibration is effectively solved. Summary of the Invention

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A photovoltaic support connection node with a limiting connecting piece includes a limiting connecting piece, an inner connecting piece, an open keel, a module frame, connecting bolts, and a frame clamping block; the module frame is set perpendicularly to the open keel, adjacent module frames are placed on the upper part of the open keel or the limiting connecting piece, the inner connecting piece is set inside the opening of the open keel, the frame clamping block is set on the upper part of the module frame, and the connecting bolts fasten the inner connecting piece, the limiting connecting piece, and the frame clamping block together. The limiting connecting piece includes a horizontal connecting plate, a lower limiting plate, and an upper limiting rib. The two sides of the horizontal connecting plate are bent vertically downward to form the lower limiting plate, which forms a keel constraint groove with the horizontal connecting plate. The horizontal connecting plate is provided with bolt connection holes, and the end edge of the horizontal connecting plate is folded upward to form the upper limiting rib. The inner connecting piece includes a connecting plate and a constraint flange rib. The connecting plate and the constraint flange ribs folded on both sides form an upward-opening groove-shaped component. The connecting plate is provided with bolt connection holes. The open keel includes a bottom plate, a web plate, and a top connecting groove. The bottom plate and the web plates on both sides form an upward-opening groove-shaped component. The top of the web plate is bent horizontally towards the center of the groove-shaped component and then bent vertically to form a downward-opening top connecting groove. The slot of the inner connecting piece faces upward, the constraint flange rib is inserted into the top connecting slot of the open keel, and the open keel is inserted into the keel constraint slot of the limiting connecting piece.

[0006] The three-layer nested connection structure transforms the originally open steel sections into closed or semi-closed sections at the connection nodes, greatly improving the stability of the components at the ends of the open keel and effectively preventing local buckling failure of the open steel sections under compression.

[0007] Furthermore, the ends of the horizontal connecting plate of the limiting connecting piece are bent upwards at 180 degrees to form an upper limit rib constraint groove with an inward opening. The component frame is placed on the upper part of the limiting connecting piece, and the inner side of the bottom edge of the component frame is inserted into the upper limit rib constraint groove for constraint connection.

[0008] The fully enclosed constraint design here provides extremely high pull-out and shear resistance, effectively preventing components from being vertically pulled out or laterally slipping off the connection node under extreme strong winds, ensuring maximum safety.

[0009] Furthermore, the ends of the horizontal connecting plate of the limiting connecting piece are bent upward at 90 degrees to form the upper limiting rib, and the component frame is placed on the upper part of the open keel, with the outer vertical edge of the component frame closely attached to the upper limiting rib.

[0010] Furthermore, the ends of the horizontal connecting plate of the limiting connecting piece are bent upward at 90 degrees to form an upper limiting rib, and the component frame is placed on the upper part of the limiting connecting piece, with the inner side of the bottom edge of the component frame closely attached to the upper limiting rib.

[0011] Furthermore, the lower limit plate of the limiting connecting piece is provided with screw holes, and is connected to the web plate of the open keel by self-tapping screws, bolts or rivets.

[0012] Furthermore, the frame pressing block includes a grooved connecting plate, the two sides of which are vertically turned upward to form a grooved web; the two sides of the grooved web are horizontally turned outward to form an upper pressing plate; the grooved connecting plate has one or more connecting bolt holes; the upper pressing plate rests on the upper part of the component frame; the frame pressing block connecting plate and the web form a groove that is inserted upward into the gap of the adjacent component.

[0013] Furthermore, the frame pressure block extends to both sides along the component frame with the connecting bolt as the center, and the extended section is provided with one or more bolt connection holes, and a lower constraint fastener is provided on the lower side of the bolt connection hole; The lower restraint fastener includes a ribbed connecting plate with connecting bolt holes. The two sides of the ribbed connecting plate are vertically folded down to form a ribbed web. The bottom of the ribbed web is folded outward in a horizontal direction to form a bottom support plate. The bottom support plate is folded upward on the outside to form a limiting rib, forming an integral W-shaped component. The outer dimensions of the web plates of the convex ribs on both sides of the lower constraint fastener are smaller than the gap dimensions of the adjacent frame. The U-shaped convex ribs formed by the web plates of the lower constraint fastener and the convex rib connecting plates are embedded from bottom to top into the gap of the component frame, limiting the bottom support groove formed by the convex ribs and the web plates of the convex ribs with the opening facing upwards. The bottom edge of the frame is embedded in the bottom support groove. The frame pressure block and the lower constraint fastener are connected by connecting bolts to fasten the adjacent component frame, frame pressure block and lower constraint fastener.

[0014] Furthermore, the limiting connecting piece, inner connecting piece, open keel, and lower constraint fastener are made of 1.5~5mm thick steel plate by mechanical cold working; the frame pressure block is made of 2~6mm thick aluminum alloy by extrusion.

[0015] Furthermore, the top of the limiting rib of the lower constraint fastener is bent laterally towards the center of the constraint fastener to form a slot in the direction of the center of the lower constraint fastener, and the inner side of the bottom edge of the component frame is inserted into the slot for constraint connection.

[0016] Furthermore, a rigid pad or washer with holes is provided at the connection bolt position between the frame pressure block and the lower constraint fastener to prevent the joint from loosening.

[0017] Furthermore, the lower constraint fastener rib connecting plate is provided with an upwardly protruding clamping rib, which clamps against the upper assembly.

[0018] Furthermore, the horizontal connecting plates of the inner connecting plate and the limiting connecting plate are connected by connecting bolts, thus fastening the open keel, the inner connecting plate and the limiting connecting plate together.

[0019] By adopting the above solution, the present invention has the following advantages compared with the prior art: 1. This invention strengthens the structural stability and connection strength of the component frame connection node by using a double connection of a top pressure block and a bottom limiting block on the component frame. It effectively avoids the loss of the load-bearing function of the connection node due to slippage or loosening or out-of-plane torsional force under wind vibration fatigue, thus preventing node damage.

[0020] 2. This invention combines two adjacent asymmetrical thin-walled frames by using frame pressing blocks, component frames, and constraint combination buckles to form a symmetrical and synergistic force-bearing structure, effectively improving the load-bearing capacity and integrity of the frame.

[0021] 3. The present invention effectively prevents the risk of node failure due to slippage of the component frame point support connection node by setting the upper limit rib of the limiting connection piece, thereby improving the safety and reliability of the photovoltaic system.

[0022] 4. The present invention uses the open keel, the inner connecting piece and the limiting connecting piece to form a closed section at the connection node, thereby effectively improving the stability of the components at the end of the open keel. The intermediate interval setting also effectively improves the overall stability of the components, thereby improving the structural safety and reliability of the support system.

[0023] 5. This invention improves the stability of the connecting bolts by using the bolt fastening connection of the limiting connecting piece, realizes the fastening of the pressure block and the stable separation of the screw, improves the anti-slip and anti-loosening performance of the node, and solves the problem that the photovoltaic module slides down the steel guide rail as a whole due to the loosening of the bolts in the traditional point-pull connection node. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of Example 1; Figure 2 This is a schematic diagram of the cross-sectional connection of Example 1; Figure 3 This is a three-dimensional structural schematic diagram of Example 2; Figure 4 This is a schematic diagram of the cross-sectional connection of Example 2; Figure 5 This is a three-dimensional structural schematic diagram of Example 3; Figure 6 This is a schematic diagram of the cross-sectional connection of Example 3; Figure 7 This is a partial schematic diagram of Example 1; Figure 8 This is a partial schematic diagram of Example 2; Figure 9 This is a partial schematic diagram of Example 3; Figure 10 This is a schematic diagram showing the connection between the internal connecting piece and the open keel; Figure 11 This is a schematic diagram of the limiting connecting piece in Embodiment 1; Figure 12 This is a schematic diagram of the limiting connecting piece in Embodiment 2; Figure 13 This is a schematic diagram of the limiting connecting piece in Embodiment 3; Figure 14 This is a schematic diagram of the internal connecting piece; Figure 15 This is a schematic diagram of an open keel; Figure 16 This is one of the schematic diagrams of the border pressing block; Figure 17 This is the second schematic diagram of the border pressing block; Figure 18 This is a connection diagram showing the location of the lower constraint fastener; Figure 19 yes Figure 18 A cross-sectional schematic diagram; Figure 20 yes Figure 19 A schematic diagram showing the installation of a washer; Figure 21 yes Figure 19 A schematic diagram showing the setting of the tightening ribs; Figure 22 This is one of the schematic diagrams of the lower constraint fastener; Figure 23 This is the second schematic diagram of the lower restraint fastener; Figure 24 This is the third schematic diagram of the lower restraint fastener; Figure 25 This is the fourth schematic diagram of the lower restraint fastener; Figure 26 yes Figure 20 A schematic diagram of a washer.

[0026] Label Explanation 1-Limit connecting piece, 11-Horizontal connecting plate, 12-Lower limit plate, 13-Upper limit rib, 14-Keel constraint groove, 15-Upper limit rib constraint groove, 16-Screw hole; 2-Inner connecting piece, 21-Connecting plate, 22-Constraint flange rib; 3-Open keel, 31-Lower base plate, 32-Web plate, 33-Top connecting groove; 4-Component border; 5-Connecting bolts; 6-Frame pressure block, 61-Groove connecting plate, 62-Groove web plate, 63-Upper pressure plate; 7- Bolt connection holes; 8-Lower restraint fastener, 81-Protruding rib connecting plate, 82-Protruding rib web, 83-Bottom support plate, 84-Limiting rib, 85-Groove, 86-Tightening rib; 9-Washer. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] This invention provides a photovoltaic support connection node with a limiting connecting piece 1, mainly including a limiting connecting piece 1, an inner connecting piece 2, an open keel 3, a module frame 4, connecting bolts 5, and a frame clamping block 6. The basic structure is as follows: the module frame 4 is vertically arranged with the open keel 3, and the module frame 4 is placed on the upper part of the open keel 3 or the limiting connecting piece 1. The upper part of adjacent module frames 4 is provided with a frame clamping block 6 and is fastened to each other by connecting bolts 5; the limiting connecting piece 1 includes a horizontal connecting plate 11, a lower limiting plate 12, and an upper limiting rib 13. The two sides of the long side of the horizontal connecting plate 11 are bent vertically downward to form the lower limiting plate 12, which forms a keel constraint groove 14 with the horizontal connecting plate 11. The horizontal connecting plate 11 is provided with bolt connection holes 7, and the short side of the horizontal connecting plate 11 is folded upward to form the upper limiting rib 13; the inner connecting piece 2 includes a connecting plate Plate 21 and constraint flange 22, the connecting plate 21 and the constraint flange 22 folded on both sides form an upward-opening groove-shaped component, the connecting plate 21 is provided with bolt connection holes 7; the open keel 3 includes a bottom plate 31, a web plate 32 and a top connecting groove 33, the bottom plate 31 and the web plates 32 on both sides form an upward-opening groove-shaped component, the top of the web plate 32 is bent horizontally towards the center of the groove-shaped component and then bent vertically to form a downward-opening top connecting groove 33; the inner connecting piece 2 has a groove 85 facing upward, the constraint flange 22 is inserted into the top connecting groove 33 of the open keel 3, the open keel 3 is inserted into the keel constraint groove 14 of the limiting connecting piece 1, the inner connecting piece 2 and the horizontal connecting plate 11 of the limiting connecting piece 1 are connected by connecting bolts 5, and the open keel 3, the inner connecting piece 2 and the limiting connecting piece 1 are fastened together. The frame pressing block includes a grooved connecting plate 61, which is vertically flipped upward on both sides to form a grooved web 62; the grooved web 62 on both sides is folded outward in the horizontal direction to form an upper pressing plate 63; the grooved connecting plate 61 has one or more connecting bolt holes, and the upper pressing plate 63 is placed on the upper part of the component frame, and the frame pressing block connecting plate and the web form a groove slot 85 that is embedded upward into the gap of the adjacent component.

[0029] The installation steps are as follows: First, construct a closed keel structure. Place the inner connecting piece 2 inside the open keel 3, so that its constraint flange rib 22 is inserted into the top connecting groove 33 of the keel. Place the open keel 3 into the keel constraint groove 14 of the limiting connecting piece 1. Use connecting bolts 5 to pass through the bolt holes of the limiting connecting piece 1 and the inner connecting piece 2 to fasten the three together. This step forms a closed section at the connection node of the open steel section, which significantly improves the stability of the component.

[0030] Next, install the components and pressure blocks. Place the photovoltaic module frame 4 on the upper part of the open keel 3 or the limiting connecting piece 1. Place the frame pressure block 6 on the upper part of the module frame 4 so that its groove is embedded into the gap of the adjacent components. The upper pressure plate 63 rests on the upper part of the frame.

[0031] Finally, use connecting bolts 5 to penetrate and tighten the inner connecting piece 2, the limiting connecting piece 1, and the frame pressure block 6.

[0032] Based on the above basic framework, the following embodiments can be derived: Example 1

[0033] like Figure 1 , Figure 2 , Figure 7 As shown, the short sides of the horizontal connecting plate 11 of the limiting connecting piece 1 are bent upward at 180 degrees to form an upper limit rib constraint groove 15 with an inward opening. The component frame 4 is placed on the upper part of the limiting connecting piece 1, and the inner side of the bottom edge of the component frame 4 is inserted into the upper limit rib constraint groove 15 for constraint connection. Example 2

[0034] like Figure 3 , Figure 4 , Figure 8 As shown, the short sides of the horizontal connecting plate 11 of the limiting connecting piece 1 are bent upward at 90 degrees to form the upper limit rib 13. The component frame 4 is placed on the upper part of the open keel 3, and the outer vertical edge of the component frame 4 is closely attached to the upper limit rib 13 for limiting. Example 3

[0035] like Figure 5 , Figure 6 , Figure 9 As shown, the short sides of the horizontal connecting plate 11 of the limiting connecting piece 1 are bent upward at 90 degrees to form the upper limit rib 13. The component frame 4 is placed on the upper part of the limiting connecting piece 1, and the inner side of the bottom edge of the component frame 4 is in close contact with the upper limit rib 13 for limiting.

[0036] In the above embodiment, the lower limiting plate 12 of the limiting connecting piece 1 is provided with screw holes 16, and is connected to the web plate 32 of the open keel 3 by self-tapping screws, bolts or rivets.

[0037] Figure 11 , 12 1 and 13 correspond to the limiting connecting piece 1 in embodiments 1-3, respectively.

[0038] When the frame pressure block 6 extends to both sides of the component frame 4 with the connecting bolt 5 as the center, the extended section is provided with one or more bolt connection holes 7, and a lower restraint fastener 8 is provided on the lower side of the bolt connection hole 7, see reference. Figure 17 , 18As shown. The lower restraint fastener 8 includes a ribbed connecting plate 81 with connecting bolt holes 5. The two sides of the ribbed connecting plate 81 are vertically folded down to form ribbed webs 82. The bottom of the ribbed webs 82 is folded outward in a horizontal direction to form a bottom support plate 83. The bottom support plate 83 is folded upward on the outside to form a limiting rib 84, forming an integral W-shaped component. The outer dimensions of the ribbed webs 82 on both sides of the lower restraint fastener 8 are slightly smaller than the gap between adjacent frames. The U-shaped ribs formed by the ribbed webs 82 and the ribbed connecting plate 81 of the lower restraint fastener 8 are embedded from bottom to top into the gap of the component frame 4. The bottom support groove formed by the limiting rib 84 and the ribbed webs 82 opens upward and is embedded in the bottom support groove at the bottom edge of the frame. The frame pressure block 6 is connected to the lower restraint fastener 8 by connecting bolts 5, which fastens the adjacent component frame 4, frame pressure block 6, and lower restraint fastener 8. The top of the limiting rib 84 of the lower constraint fastener 8 is bent laterally towards the center of the constraint fastener to form a slot 85 in the direction of the center of the lower constraint fastener 8. The inner side of the bottom edge of the component frame 4 is inserted into the slot 85 for constraint connection.

[0039] Preferably, a washer 9 with holes is provided at the position of the connecting bolt 5 between the frame pressure block 6 and the lower constraint fastener 8 to prevent the joint from loosening. Figure 20 As shown. Alternatively, the lower constraint fastener 8 can have an upwardly protruding clamping rib 86 on the connecting plate 81, which clamps against the upper assembly, as shown. Figure 21 As shown.

[0040] The aforementioned limiting connecting piece 1, inner connecting piece 2, open keel 3, and lower constraint fastener 8 are formed by mechanical cold working of 3mm thick steel plate; the frame pressure block 6 is formed by extrusion of 4mm thick aluminum alloy.

[0041] The above are merely specific embodiments of the present invention. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in the present invention are for reference only and are not absolute limitations. Any non-substantial modifications made using the present invention shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A photovoltaic support connection node with a limiting connecting piece, comprising a limiting connecting piece, an inner connecting piece, an open keel, a module frame, connecting bolts, and a frame clamping block; the module frame is perpendicular to the open keel, adjacent module frames are placed on the upper part of the open keel or the limiting connecting piece, the inner connecting piece is disposed inside the opening of the open keel, the frame clamping block is disposed on the upper part of the module frame, and the connecting bolts fasten the inner connecting piece, the limiting connecting piece, and the frame clamping block together. The limiting connecting piece includes a horizontal connecting plate, a lower limiting plate, and an upper limiting rib. The two sides of the horizontal connecting plate are bent vertically downward to form the lower limiting plate, which forms a keel constraint groove with the horizontal connecting plate. The horizontal connecting plate is provided with bolt connection holes, and the end edge of the horizontal connecting plate is folded upward to form the upper limiting rib. The inner connecting piece includes a connecting plate and a constraint flange rib. The connecting plate and the constraint flange ribs folded on both sides form an upward-opening groove-shaped component. The connecting plate is provided with bolt connection holes. The open keel includes a bottom plate, a web plate, and a top connecting groove. The bottom plate and the web plates on both sides form an upward-opening groove-shaped component. The top of the web plate is bent horizontally towards the center of the groove-shaped component and then bent vertically to form a downward-opening top connecting groove. The slot of the inner connecting piece faces upward, the constraint flange rib is inserted into the top connecting slot of the open keel, and the open keel is inserted into the keel constraint slot of the limiting connecting piece.

2. The photovoltaic support connection node with limiting connecting piece according to claim 1, characterized in that: The limiting connecting piece is bent upward at 180 degrees on both sides or one side of the horizontal connecting plate to form an upper limit rib constraint groove with an inward opening. The component frame is placed on the upper part of the limiting connecting piece, and the inner side of the bottom edge of the component frame is inserted into the upper limit rib constraint groove for constraint connection.

3. The photovoltaic support connection node with limiting connecting piece according to claim 1, characterized in that: The limiting connecting piece is bent upward at 90 degrees on both sides or one side of the horizontal connecting plate to form an upper limiting rib. The component frame is placed on the upper part of the open keel, and the outer vertical edge of the component frame is in close contact with the upper limiting rib.

4. The photovoltaic support connection node with limiting connecting piece according to claim 1, characterized in that: The limiting connecting piece has its two sides or one side of the horizontal connecting plate bent upward at 90 degrees to form an upper limiting rib. The component frame is placed on the upper part of the limiting connecting piece, and the inner side of the bottom edge of the component frame is in close contact with the upper limiting rib.

5. A photovoltaic support connection node with a limiting connecting piece according to claim 2, 3, or 4, characterized in that: The lower limit plate of the limiting connecting piece is provided with screw holes, and is connected to the web plate of the open keel by self-tapping screws, bolts or rivets.

6. A photovoltaic support connection node with a limiting connecting piece according to claim 1, characterized in that: The frame pressing block includes a grooved connecting plate, which is vertically flipped upward on both sides to form a grooved web; the grooved webs on both sides are folded outward in the horizontal direction to form an upper pressing plate; the grooved connecting plate has one or more connecting bolt holes; the upper pressing plate rests on the upper part of the component frame; the frame pressing block connecting plate and the web form a groove that is inserted upward into the gap of the adjacent component.

7. A photovoltaic support connection node with a limiting connecting piece according to claim 6, characterized in that: The frame pressure block extends to both sides along the component frame with the connecting bolt as the center. The extended section is provided with one or more bolt connection holes, and a lower constraint fastener is provided on the lower side of the bolt connection hole. The lower restraint fastener includes a ribbed connecting plate with connecting bolt holes. The two sides of the ribbed connecting plate are vertically folded down to form a ribbed web. The bottom of the ribbed web is folded outward in a horizontal direction to form a bottom support plate. The bottom support plate is folded upward on the outside to form a limiting rib, forming an integral W-shaped component. The outer dimensions of the web plates of the convex ribs on both sides of the lower constraint fastener are smaller than the gap dimensions of the adjacent frame. The U-shaped convex ribs formed by the web plates of the lower constraint fastener and the convex rib connecting plates are embedded from bottom to top into the gap of the component frame, limiting the bottom support groove formed by the convex ribs and the web plates of the convex ribs with the opening facing upwards. The bottom edge of the frame is embedded in the bottom support groove. The frame pressure block and the lower constraint fastener are connected by connecting bolts to fasten the adjacent component frame, frame pressure block and lower constraint fastener.

8. A photovoltaic support connection node with a limiting connecting piece according to claim 1 or 7, characterized in that: The limiting connecting piece, inner connecting piece, open keel, and lower constraint fastener are made of 1.5~5mm thick steel plate by mechanical cold working; the frame pressure block is made of 2~6mm thick aluminum alloy by extrusion.

9. A photovoltaic support connection node with a limiting connecting piece according to claim 7, characterized in that: The top of the limiting rib of the lower constraint fastener is bent laterally towards the center of the constraint fastener to form a slot in the direction of the center of the lower constraint fastener. The inner side of the bottom edge of the component frame is inserted into the slot for constraint connection.

10. A photovoltaic support connection node with a limiting connecting piece according to claim 7, characterized in that: A rigid pad or washer with holes is installed at the connection bolt position between the frame pressure block and the lower constraint fastener to prevent the joint from loosening.

11. A photovoltaic support connection node with a limiting connecting piece according to claim 7, characterized in that: The lower restraint fastener rib connecting plate has an upwardly protruding clamping rib that clamps against the upper assembly.

12. A photovoltaic support connection node with a limiting connecting piece according to claim 1, characterized in that: The horizontal connecting plates of the inner connecting plate and the limiting connecting plate are connected by connecting bolts, which fasten the open keel, the inner connecting plate and the limiting connecting plate together.

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