Purline, purline assembly and photovoltaic support

Abstract

The utility model relates to a purline, a purline assembly and a photovoltaic support. The purline assembly comprises a purline and two hoop pieces, the purline comprises two first plate pieces and two second plate pieces, the first plate pieces and the second plate pieces jointly form a containing groove, and the two hoop pieces are arranged in the containing groove in a pivoted mode through preassembled rivets. One side of the purline and the hoop member jointly enclose and fix the main shaft, and the other side is connected with the photovoltaic module. The purline comprises a middle area and two end areas, and in the middle area, the second plate and the containing groove all form a protruding shape with the middle wider than the two ends. Through the curved surface attaching technology and a rigid-flexible coupling force transmission mechanism, uniform load transmission is achieved, and the structural rigidity is improved. A reinforcing protrusion structure arranged in the middle of the purline is combined with diagonal force transmission path optimization, and multi-directional stress dispersion is conducted on dynamic loads. And through the arrangement of the preassembling rivet and the rotatable hoop piece, high-precision preassembling and a modular opening and closing structure are achieved, lossless disassembling and assembling and robot clamping are supported, and the device is suitable for automatic construction.

Description

Technical Field

[0001] This application relates to the field of photovoltaic equipment technology, and in particular to a purlin, a purlin assembly, and a photovoltaic support structure. Background Technology

[0002] With the rapid development of photovoltaic power generation technology, photovoltaic (PV) mounting systems, as the core support structure for PV modules, have become a focus of industry attention. As the purlins in the PV mounting system are in direct contact with the PV modules, their structural design needs to consider factors such as load-bearing capacity, cost, and installation efficiency.

[0003] Existing technologies provide various photovoltaic (PV) mounting brackets and components for PV mounting brackets. For example, U.S. Patent No. 11527988B2 discloses a mounting bracket assembly; see its appendix. Figure 8 According to B-8D and its instruction manual, column 7, lines 37-46, the mounting bracket assembly may include a first extension panel, a first clamp, a main body, a second clamp, and a second extension panel. A single bolt passes through the first extension panel, the first clamp, the main body, the second clamp, and the second extension panel for locking. However, its structure is complex, its installation efficiency is low, its production cost is high, and it is difficult to automate the installation.

[0004] U.S. Patent No. 12074559B2 discloses a photovoltaic module installation system; see column 5, lines 23-54 of its specification and appendix. Figure 1 A-1C includes a module clamp and a torque strip coupled to the module clamp, wherein one or more ends of the module clamp are wider than the central portion of the module clamp. However, in this technical solution, the ends of the module clamp are shorter than the central portion, resulting in the central portion having a narrower but taller profile than either end. When the photovoltaic module is installed on the photovoltaic module mounting system, the torque strip clamping applies significant stress to the central portion of the module clamp, leading to insufficient load-bearing strength in the central portion. Therefore, structural reinforcement design of the central portion of the module clamp is necessary. Utility Model Content

[0005] In view of the shortcomings of the prior art, this application provides a purlin assembly to solve the technical problem that the existing purlin assembly has weak load-bearing capacity, especially the insufficient load-bearing capacity in the middle area of ​​the purlin assembly under low-cost design.

[0006] To achieve the above objectives, this application provides the following technical solution.

[0007] The first aspect of this application relates to a purlin assembly for fixing a photovoltaic module to a main shaft, comprising a purlin including two first plates and a second plate; wherein the second plate extends integrally along a first direction and has a width in a second direction, and the two first plates extend from two edges of the second plate in the second direction toward a first side of the second plate, thereby forming a receiving groove together with the first plates, wherein the second plate is adapted to connect the photovoltaic module; and further comprising a fixing device, one end of which is disposed in the receiving groove near the purlin, the fixing device being adapted to, together with at least a portion of the purlin, enclose and fix the main shaft.

[0008] The purlin includes a central region and two end regions located on both sides of the central region along the first direction; in the central region, the second plate forms a convex shape that is wider in the middle than at both ends, and in a cross section parallel to the first and second directions, the two first plates also form a convex shape that is wider in the middle than at both ends.

[0009] Another aspect of this application relates to a purlin for fixing a photovoltaic module to a main shaft, comprising two first plates and a second plate; wherein the second plate extends integrally along a first direction and has a width in a second direction, and the two first plates extend from two edges of the second plate in the second direction toward a first side of the second plate, thereby forming a receiving groove together with the first plate, wherein the second plate is adapted to connect the photovoltaic module; the receiving groove is configured to accommodate a fixing device near one end of the purlin within the receiving groove, thereby allowing a portion of the purlin and the fixing device to jointly enclose and fix the main shaft; wherein the purlin includes a central region and two end regions located on both sides of the central region along the first direction; in the central region, the second plate forms a convex shape wider in the middle than at both ends, and in a cross section parallel to the first and second directions, the two first plates also form a convex shape wider in the middle than at both ends.

[0010] Another aspect of this application relates to a photovoltaic support, including multiple columns, multiple column tops, multiple bearing assemblies, and a main shaft. The multiple columns and multiple column tops are installed in a one-to-one correspondence, and the multiple bearing assemblies are installed in a one-to-one correspondence with the multiple column tops. The main shaft passes through the multiple bearing assemblies and also includes purlin assemblies as described in any of the preceding embodiments. The multiple purlin assemblies are installed at intervals along the extension direction of the main shaft, and two adjacent purlin assemblies are used to support photovoltaic modules.

[0011] This application and its embodiments have at least one of the following beneficial technical effects.

[0012] 1. The central area of ​​the purlin adopts a spindle-shaped structure and other protruding features, which disperses dynamic loads in multiple directions, reduces the risk of stress concentration, and improves the load-bearing capacity of the purlin.

[0013] 2. The outward-hugging design of the clamp fits the curved contour of the photovoltaic main shaft, increasing the contact area. Combined with the purlin structure made of high-strength stamped steel, it achieves uniform load transfer and improved resistance to deformation.

[0014] 3. The design adopts pre-installed rivets and rotatable clamps, and high-precision assembly is completed before leaving the factory. Only bolt tightening is required on site, reducing human error. The clamps adopt a modular opening and closing structure, which supports non-destructive disassembly and robot clamping interface, and is compatible with automated construction.

[0015] 4. The entire purlin and clamp components form a closed-loop technology system integrating design, installation, and maintenance, from stamping process to ensure structural consistency, to pre-assembly mechanism to ensure connection reliability, and adjustable interface to reserve expansion space.

[0016] 5. This application improves installation stability by optimizing the design of the inner wall of the clamp and the contact surface of the purlin to match the shape of the main shaft. Combined with topological mechanics reconstruction, the clamp transmits force diagonally. In addition, this structure is compatible with intelligent installation, which solves the contradiction between stability, load-bearing capacity and construction efficiency of traditional purlin structures. It provides a standardized and highly reliable connection system solution for the construction of photovoltaic power stations in harsh environments such as high altitude and strong wind areas. Attached Figure Description

[0017] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further illustrate the above-mentioned characteristics, technical features, advantages, and implementation methods of this application. The preferred embodiments are given only as examples, and this application is not limited thereto.

[0018] Figure 1 A partial perspective view of one embodiment of the photovoltaic bracket of this application is shown schematically.

[0019] Figure 2 for Figure 1 A partial perspective view of another embodiment.

[0020] Figure 3 This is a perspective view of one embodiment of the purlin assembly of this application.

[0021] Figure 4 for Figure 3 Perspective view of the purlin in the embodiment.

[0022] Figure 5 This is a perspective view of another embodiment of the purlin assembly.

[0023] Figure 6A for Figure 3 A top view of the purlin in the embodiment.

[0024] Figure 6B This is a top view of a purlin assembly according to another embodiment.

[0025] Figures 7A-7G This is a schematic diagram of several embodiments of the outline of the second plate in the central region.

[0026] Figure 7H for Figure 9 A partial view of the CC cross-section in the image.

[0027] Figure 8 for Figure 3 A partial top view of the purlin in the embodiment.

[0028] Figure 9 for Figure 3 A partial front view of the purlin in the embodiment.

[0029] Figure 10 for Figure 1 A partial perspective view of another embodiment.

[0030] Figure 11 for Figure 3 A schematic diagram of the embodiment and the spindle fixing process.

[0031] Figure 12 for Figure 11 The AA section diagram shown in the middle (pre-installed rivets not cut).

[0032] Figure 13 for Figure 3 A front view of one of the clamp components in the embodiment.

[0033] Figure 14 for Figure 13 The BB section view is shown in the center (the view has been rotated for easier viewing).

[0034] Figure 15 for Figure 13 A perspective view of the clamp component.

[0035] Figure 16 for Figure 3 A partial perspective view of another embodiment.

[0036] Figure 17 This is a perspective view of another embodiment of the purlin assembly of this application.

[0037] Figure 18A for Figure 17 A partial perspective view of the clamp component in the embodiment.

[0038] Figure 18B for Figure 18A A partial perspective view from another angle after the clamping bolts and nuts are installed.

[0039] Figure 18C for Figure 18B A partial perspective view of the component shown from another angle.

[0040] Figure 19 for Figure 1 A cross-sectional schematic diagram of the spindle in the embodiment.

[0041] Figure 20 for Figure 3 A schematic perspective view of the embodiment and the main shaft after connection.

[0042] Figure 21 for Figure 3 Side view of the purlin in the embodiment.

[0043] Reference numerals in the attached drawings: 10: Photovoltaic bracket; 20: Photovoltaic module; 100: Purlin assembly; 110: Purlin; 111: First plate; 112: Second plate; 113: Receiving groove; 114: Middle area; 115: End area; 116: Third plate; 117: Reinforcing rib; 118: Connection area; 119: Flanged edge; 120: Clamp; 121: Connecting part; 122: Mating part; 123: Locking part; 124: Bottom wall; 125: Wing; 126: Opening slot; 128: Contraction part; 129: Limiting cavity; 131: Pre-installed rivet; 132: Bolt; 133: Nut; 14 1: Column, 142: Column top seat, 143: Bearing assembly, 144: Spindle, 147: Planar segment, 148: Arc segment, 1121: Groove, 1122: Waist-shaped hole, 1161: Abutting surface, 1241: Through hole, H1: First height, H2: Second height, H3: Third height, L1: First length, L2: First distance, L3: Second distance, W1: First width, W2: Second width, W3: Third width, W4: Fourth width, W5: Fifth width, X-X': First direction, Y-Y': Second direction, Z-Z': Third direction, D: First side; S: Installation space. Detailed Implementation

[0044] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. The accompanying drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0045] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application and does not represent their actual structure as a product. In some drawings, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "a" means not only "only one" but also "more than one." The term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. The terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0046] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] Additionally, in the accompanying drawings, underlined reference numerals indicate illustrated assemblies. Reference numerals with short curves without arrows are used to indicate solid parts or structures; reference numerals with short curves with arrows indicate non-solid structures or geometric features of solid structures, such as recesses, through holes, slots, and surfaces. Parentheses indicate the extent of a local structure. Double-dotted lines indicate the structural boundaries of a local structure, the outline of a virtual component, or indicate direction. Leader lines with arrows and reference numerals are used to indicate dimensions.

[0048] like Figure 1 As shown, photovoltaic modules 20 typically need to be mounted on photovoltaic brackets 10. The photovoltaic brackets 10 include multiple columns 141 mounted on the ground or a structure. A main shaft 144 is mounted on each column 141 and is adapted to rotate the photovoltaic modules 20 to more effectively receive sunlight. This application relates to a purlin assembly 100 for mounting photovoltaic modules 20 to the main shaft 144.

[0049] like Figure 2As shown, the photovoltaic module 20 is typically flat and extends along a first direction X-X' and a second direction Y-Y'. The main shaft 144 extends along the second direction Y-Y'. In addition to the main shaft 144 and the purlin assembly 100, the photovoltaic support 10 typically includes multiple columns 141, multiple column tops 142, and multiple bearing assemblies 143. The multiple columns 141 are installed one-to-one with the multiple column tops 142, and the multiple bearing assemblies 143 are installed one-to-one with the multiple column tops 142. The main shaft 144 passes through the multiple bearing assemblies 143. Specifically, the bearing assembly 143 includes a bearing housing and a bearing. The bearing is rotatably mounted in the bearing housing, and the main shaft 144 passes through a through hole in the middle of the bearing to complete the installation.

[0050] Multiple purlin assemblies 100 are spaced apart along a second direction Y-Y' between the main shaft 144 and the photovoltaic module 20. Each adjacent purlin assembly 100 can support one photovoltaic module of the photovoltaic module 20. In this way, the purlin assemblies 100 fix the photovoltaic module 20 to the main shaft 144, and the main shaft 144 can drive it to rotate about an axis in the second direction Y-Y'. The main shaft 144 is typically a torque tube, requiring the purlin assemblies 100 to apply torque to the photovoltaic module 20 to cause it to rotate.

[0051] Conversely, in the process of resisting wind loads, the purlin assembly 100 also needs to withstand the pressure and other dynamic loads from the photovoltaic module 20 and transmit these loads to the main shaft 144. Whether it is the case where the main shaft 144 drives the photovoltaic module 20 to rotate, the case of resisting wind loads, or even the case of the combination of the two, it may cause a complex stress distribution inside the purlin assembly 100, and local stress concentration may occur, thereby increasing fatigue loads and increasing the risk of failure in long-term use.

[0052] Since the purlin assembly 100 is fixed to the photovoltaic module 20 and rotates with it, the purlin assembly 100 must not only provide reliable connection rigidity to avoid deformation under the weight of the photovoltaic module 20 and wind load, but also be lightweight to reduce costs.

[0053] Furthermore, since photovoltaic support brackets 10 typically require large-scale installation, high installation efficiency is essential. In recent years, automated installation has developed rapidly. If the photovoltaic support brackets 10, especially the purlin components 100, are designed to facilitate clamping and securing by installation robots, installation costs can be significantly reduced.

[0054] In the various embodiments of this application, the above-mentioned requirements for the load-bearing capacity and lightweight of the purlin assembly 100 are first taken into consideration, and then targeted settings are made for ease of installation, installation accuracy, and adaptability to automated installation.

[0055] Figure 3It shows Figure 2 A perspective view of the purlin component 100. (See image.) Figure 2 The purlin assembly 100 is shown for securing the photovoltaic module 20 to the main shaft 144. In this embodiment, the purlin assembly 100 includes a purlin 110 and two clamps 120, as well as a fastening assembly for locking the two clamps 120. The fastening assembly includes bolts 132 and nuts 133 (see reference). Figure 16 and Figure 18B , Figure 18C The two clamping components 120 together form a clamp (also referred to as a fixing device in this application), one end of which is fixed to the purlin 110, and the other end is fixed to the main shaft 144 with the cooperation of fastening components such as bolts 132 and nuts 133. Figure 3 As shown, two clamps 120 and a portion of the purlin 110 enclose an installation space S, and the main shaft 144 is fixed to this installation space S.

[0056] like Figure 3 and Figure 4 As shown, the purlin 110 includes two first plates 111 and one second plate 112. The second plate 112 extends integrally along a first direction X-X', which is perpendicular to a second direction Y-Y' extending from the main shaft 144. The second direction Y-Y' is also the width direction of the second plate 112. The two first plates 111 extend from two edges of the second plate 112 along the second direction Y-Y' towards a first side D of the second plate 112. The direction of the first side D is shown in [reference needed]. Figure 21 .from Figure 2 and Figure 3 As observed in the figure, the first side D is the lower part of the second plate 112, and the two edges of the second plate 112 in the second direction Y-Y' are the two sides of the width direction of the second plate 112. Thus, one second plate 112 and two first plates 111 together form a receiving groove 113. The cross-section of the receiving groove 113 is U-shaped or C-shaped. The second plate 112 is suitable for connecting the photovoltaic module 20. Specifically, its second side relative to the first side D is suitable for at least partially abutting against the photovoltaic module 20. As seen in the figure, this second side is the upper surface of the second plate 112. This can also be seen from... Figure 2 This was observed in [the context].

[0057] The receiving groove 113 is suitable for mounting a fixing device for fixing the main spindle 144. As described above, in this embodiment, the fixing device is two clamping members 120. However, in other embodiments, other fixing devices in the prior art can be used to replace the two clamping members 120, for example, a single U-shaped clamping member 120 can be used. Figure 5Below the purlin 110, the main shaft 144 (not shown in the figure) is pressed and enclosed along the third direction Z-Z', and the clamp 120 is fixed to the receiving groove 113 of the purlin 110 by fasteners such as rivets or bolts and nuts. Figure 3 As shown, the third direction Z-Z' is perpendicular to both the first direction X-X' and the second direction Y-Y'.

[0058] Figure 5 The embodiments described herein can also be implemented by pre-installing rivets 131 on individual clamping members 120 (see [reference]). Figure 3 When the purlin is pivotally pre-installed onto the purlin 110 and then fixed onto the main shaft 144 (not shown in the figure), the purlin 110 is fastened to the main shaft 144 and its movable end is fixed to the purlin 110 by bolts, nuts and other fixing components.

[0059] exist Figure 3 In this embodiment, the two clamping members 120 are pivotally mounted in the receiving groove 113 via pre-installed rivets 131. However, in other embodiments, the fixing device may also employ two non-pivotibly mounted clamping members 120, for example in... Figure 3 and Figure 4 Upon closer inspection, the upper ends of the two clamping parts 120 can be fixed to the first plate 111, and their lower ends can be fixed to each other. It can be seen that... Figure 3 Based on the purlin 110 of the embodiment, the fixing device can have various implementations, and Figure 3 The purlins 110 in this embodiment collectively constitute the purlin assembly 100.

[0060] Back Figure 3 Examples, and references Figure 6A The purlin 110 includes a central region 114 and two end regions 115 located on either side of the central region 114 along a first direction X-X'. In the central region 114, the second plate 112 forms a convex shape that is wider in the middle than at both ends, and in a section perpendicular to the third direction Z-Z', i.e. parallel to the first direction X-X' and the second direction Y-Y', the two first plates 111 also form a convex shape that is wider in the middle than at both ends (see [link]). Figure 7H In other words, the structure formed by the first plate 111 and the second plate 112 in the entire central region 114 has a convex shape that is wider in the middle than at both ends. The above arrangement can be implemented... Figure 6A Intuitive understanding Figure 6A This is a top view of the purlin 110 as viewed along the third direction Z-Z' towards the position of the main axis 144.

[0061] It should be noted that in this document, when describing two-dimensional or three-dimensional structures, rounded corners or smooth edges with transitions are always included in the overall structure description. Those skilled in the art will understand that these features are required by actual manufacturing processes, such as stamping or die-casting. Ideal sharp corners or edges are practically impossible to produce through simple stamping or die-casting processes, offer no benefit in most practical applications, and may even pose safety hazards and stress concentrations. These rounded corner or smooth edge features should not affect the overall description of the two-dimensional or three-dimensional structure in this document. For example, when a two-dimensional structure is described as a "rhombus," if the two-dimensional structure is actually a rhombus with rounded corners, the structure should still be allowed to be called a "rhombus." Other shapes or structures are similar.

[0062] Since the purlins 110 in the central region 114 play a crucial role in fixing the main shaft 144 and transmitting torque, the central region 114 of this application adopts an outwardly convex structure, including a second plate 112 in the central region 114 and a receiving groove 113 formed by the second plate 112 and two first plates 111. Figure 6A Upon observation, the convex structure is manifested in the fact that the contours on both sides of the second plate 112 at this location are formed by convex curves. Assuming the first direction X-X' is the X-axis and the second direction Y-Y' is the Y-axis, then one side of this contour forms a convex function curve, and at least a portion of this convex function curve constitutes a strictly convex function curve. A convex function curve is defined as one where the average of the function values ​​at any two X-coordinates is less than or equal to any function value in between. A strictly convex function curve is defined as one where the average of the function values ​​at any two X-coordinates is less than any function value in between.

[0063] Examples of these convex function curves include the following curves or parts thereof: circular arcs, ellipses, trapezoids, spindles, rhombuses, other polygons, parabolas, Gaussian curves, Bezier curves, racetrack shapes (also called capsules or waists), and combinations of parts thereof.

[0064] Specifically, with Figure 6A Taking the outer contour of the second plate 112 in the central region 114 of the viewpoint as an example, see examples of the contour of the second plate 112 in the central region 114 formed by these convex curves. Figures 7A-7G Among them, and Figure 6A Consistent with this, the left-right direction in these diagrams is the first direction X-X', and the up-down direction is the second direction Y-Y'. These directions will not be individually labeled in the diagrams. Additionally, as... Figure 7H As shown, in Figure 9 In the CC section (i.e., the cross-sectional view) shown, the structure formed by the two first plates 111 also has a similar structure. Figure 7A The convex contour. Similarly, when the outer contours of the second plate 112 are respectively Figure 7B-7GWhen setting up, the two corresponding first plates 111 also appear in the CC section as respectively and Figure 7B-7G A similar convex profile.

[0065] Figure 7A A truncated rhomboid profile is shown. As mentioned earlier, this profile includes rounded corners, but this should not affect our description of the overall characteristics of the profile. The same applies below. The profile monotonically decreases in width from the middle to both ends, with the middle width being a first width W1, the widths at the left and right ends being a second width W2, and the lengths on the left and right sides being a first length L1. Figure 7B A rectangular profile with trapezoidal narrowing at both ends is shown. Figure 7C A truncated ellipse is shown. Figure 7D A barrel shape with convex arcs on the sides is shown. Figure 7E A capsule shape with truncated ends is shown. Figure 7F This illustrates a butterfly shape with Gaussian curves on its sides. Gaussian curves are also known as normal distribution curves or bell curves.

[0066] Not shown in the figure, but other curves that can be used include parabolas, Bézier curves, and polynomial curves. Among these, Bézier curves are parametric polynomial curves commonly used in CAD and graphic design. Essentially, they are combinations of Bernstein polynomials, characterized by flexibility, smoothness, and the ability to construct complex curves using multiple control points. The truncated rhombus shape in this application refers to a side curve that is... Figures 7A-7F The outline is not shown, but it conforms to the characteristics of convex functions on both sides and a width that is greater in the middle than at both ends.

[0067] These curves can also be combined to form complex convex shapes. The combination can be two-level or higher. For example, Figure 7G This illustrates a simple composite convex shape with sides formed by combining two circular arcs of different curvatures. Besides circular arcs, other suitable curves or portions of curves can also be combined, as can curves with different parameters and types. The combination can be achieved through fillet transitions. In fact, Figure 7G The two arcs in the design are also transitioned by rounded corners with a smaller radius of curvature.

[0068] As described above, in the central region 114, the overall shape of the second plate 112 is set to one of the following shapes: truncated spindle shape, truncated rhombus shape, truncated ellipse shape, rectangle with trapezoidal narrowing at both ends, barrel shape with outward convex arc on the side, capsule shape with flattened ends, butterfly shape with Gaussian curve on the side, and composite outward convex shape with secondary protrusions on the side.

[0069] The technical advantage of the aforementioned shape is that, in the central region with a first width W1, the purlin 110 can fit more closely to the main shaft 144, thus achieving better support and reducing the likelihood of deformation and stress concentration. Simultaneously, near the end region 115, the structure's width narrows to a second width W2, providing better structural rigidity for the installation of fixing devices such as clamps 120, which typically have smaller widths, while also reducing the weight of the purlin 110. This overall design balances structural rigidity and the weight of the purlin 110, achieving a lightweight design.

[0070] Such as 7A-7G and Figure 8 As shown, the width of the second plate 112 and the receiving groove 113 in the central region 114 decreases from the first width W1 to the second width W2. To further achieve lightweight design, the dimensions of the second plate 112 can be optimized through simulation. Specifically, the maximum width of the second plate 112 in the central region 114 is the first width W1, the minimum width is the second width W2, and the length along the first direction X-X' is the first length L1. The preferred range for the ratio W1 / W2 of the first width W1 and the second width W2 is 1.5 to 3; the preferred range for the ratio L1 / W1 of the first length L1 and the first width W1 is 2 to 4.

[0071] In some preferred embodiments, such as Figure 6A and Figure 8 As shown, the purlin 110 may further include two third plates 116, which extend outward along a second direction Y-Y' from the ends of the two first plates 111 away from the second plates 112. The third plates 116, or a portion thereof, are located in the central region 114 and are adapted to abut against the main shaft 144 to increase the contact area between the purlin 110 and the main shaft 144. In embodiments without the third plates 116, the ends of the two first plates 111 away from the second plates 112 may also be provided with rolled edges to abut against the main shaft 144, or a pressure block or plate may be provided between the first plates 111 and the main shaft 144 to achieve abutment. However, the advantage of providing the third plates 116 is that they can be integrated with the first plates 111 and the second plates 112 using a low-cost stamped or die-cast part, and can provide better installation stability and fit.

[0072] To fit the spindle 144, the third plate 116 needs to extend along the second direction Y-Y'. However, the extension direction of other plates, such as the first plate 111, can be more flexible. Although not shown in detail in the figure, those skilled in the art will understand that the first plate 111 or a portion thereof may not extend along the third direction Z-Z', but instead form a draft angle, which is not only beneficial for stamping or die casting, but also improves the overall stability of the structure. Similarly, the second plate 112 extends entirely along the first direction X-X', but its parts may also have structures such as ramps, indentations, and corrugations.

[0073] like Figure 8 and Figure 21 As shown, in some preferred embodiments, the width of the third plate 116 in the second direction Y-Y' gradually decreases from a midpoint toward the two end regions 115. Viewed along the third direction Z-Z', the edge of the third plate 116 is convexly arc-shaped. The third direction Z-Z' is perpendicular to both the second and third directions Y-Y'. Of course, the edge of the third plate 116 can also be... Figures 7A-7G The outline shown is illustrated above. The advantage of this arrangement is that, at the middle position, which is also the middle position of the main shaft 144 in the first direction X-X', the purlin 110 has the largest contact area with the main shaft 144, thus achieving better support. Furthermore, the narrowing width towards the end region 115 not only reduces the weight of the purlin 110 with minimal impact on the support effect, but also achieves a smooth change in structural stiffness, realizing a rigid-flexible coupling force transmission mechanism, which is beneficial for stress dispersion and avoids stress concentration.

[0074] Of course, such as Figure 6B As shown, in other embodiments, the edge of the third plate 116 may also include a shape consisting of two convex arcs and a recess between them.

[0075] like Figure 9 As shown, the abutment surface 1161 of the third plate 116, away from the second plate 112, is at least partially adapted to the outer surface of the spindle 144, and as... Figure 10 As shown, it abuts against spindle 144 after installation. For example... Figure 9 As shown, in the central region 114, at least one reinforcing rib 117 is provided at the angle formed by each first plate 111 and the corresponding third plate 116; in this embodiment, two ribs are symmetrically distributed on the left and right. Similarly, in the end region 115, reinforcing ribs 117 can also be provided at the angle formed by each first plate 111 and the second plate 112. Reinforcing ribs 117 can also be provided at other similar locations as needed to improve the local structural rigidity.

[0076] like Figure 8As shown, the maximum width of the third plate 116 is the third width W3. Figure 8 In this embodiment, the third plate 116 extends into the connecting region 118 and then into the end region 115, and its width gradually decreases to or close to the first width W1. This arrangement further enhances the overall rigidity of the purlin 110. In the portion of the end region 115 near both ends, the width of the second plate 112 is a fourth width W4, which is the maximum width of the purlin 110, i.e., W4>W3>W1>W2. The ratio of the fourth width W4 to the first width W1, W4 / W1, is preferably in the range of 1.5 to 3, and more preferably... Figure 8 W4 / W1 = 2.

[0077] like Figure 9 As shown, in some preferred embodiments, the minimum height of the first plate 111 in the third direction Z-Z' of the end region 115 is the second height H2, which is smaller than the minimum height of the first plate 111 in the middle region 114, i.e., the first height H1. The minimum height is mentioned because these regions do not necessarily have a single height. However, overall, the first plate 111 in the middle region 114 has a greater height, and the first plate 111 in the end region 115 has a smaller height. Specifically, at both ends of the entire purlin 110, the first plate 111 has a uniform second height H2 over a given length. The advantage of this arrangement is that the middle region 114 has higher bending stiffness, and the end region 115 has relatively lower bending stiffness, which not only reduces the overall weight of the purlin 110 but also, in conjunction with the arrangement of the third plate 116, helps to achieve a rigid-flexible coupling force transmission mechanism.

[0078] like Figure 6A As shown, to facilitate and improve the bonding connection with the photovoltaic module 20, the second plate 112 has two oblong holes 1122 spaced apart along the second direction Y-Y' in each end region 115. The second plate 112 also has a groove 1121 extending along the first direction X-X' in each end region 115. The long axis of the oblong holes 1122 can be set according to tolerance requirements. Besides the method shown in the attached figure, the long axis of the oblong holes 1122 in one end region 115 can be set along the first direction X-X', and the long axis of the oblong holes 1122 in the other end region 115 can be set along the second direction Y-Y'; or, the long axis of the oblong holes 1122 located at one diagonal can be set along the first direction X-X', and the long axis of the oblong holes 1122 located at the other diagonal can be set along the second direction Y-Y', to accommodate the tolerances of the mounting structure. The groove 1121 can not only improve the uniform bonding between the second plate 112 and the photovoltaic module 20, but also increase the local stiffness of the second plate 112 at both ends.

[0079] like Figure 9As shown, in some preferred embodiments, the second plate 112 is recessed towards the first side D in the middle region 114 relative to the end region 115. In the figure, this means the second plate 112 is recessed downwards in the middle region 114, so that the second plate 112 only abuts against the photovoltaic module 20 in the end region 115. The figure shows an embodiment where the middle region 114 is recessed by a third height H3. This arrangement improves the overall fit between the purlin 110 and the photovoltaic module. Without the recessed structure, if the purlin 110 has a slight protrusion in the middle region 114 due to manufacturing tolerances, it will cause poor fit in at least one end region 115, which is a critical area for torque transmission. Another advantage of this arrangement is that it allows the purlin 110 to have a trapezoidal structure overall, achieving a larger dimension in the third direction Z-Z' with the same weight, thereby improving its bending resistance and torque transmission capacity. The above effects can be achieved in… Figure 10 Intuitive understanding.

[0080] All embodiments of the purlin assembly 100 described above include a fixing device, such as... Figure 3 The two clamps in the middle are 120, or Figure 5 The purlin assembly 100 of this application may include individual clamps and other fastening devices provided in the prior art. However, these fastening devices may also be omitted. For example, these fastening devices, such as clamps, may be pre-fitted onto the spindle 144 and fixed to the purlin 110 during installation. Alternatively, the clamps and other fastening devices may be provided as individual components for fixing the purlin assembly 100 and the spindle 144 during on-site installation.

[0081] In a preferred embodiment of the purlin assembly 100 including the fixing device, such as Figure 3 In one embodiment, the fixing device includes two clamps 120 located on the first side D of the purlin 110, i.e., the lower side in the figure. The first side D can be... Figure 21 Clearly visible in the image. One clamping member 120 and another clamping member 120, located at the ends near the purlin 110, are pivotally mounted on the first plate 111 at intervals, allowing the two clamping members 120 to open and close relative to each other. (See image below.) Figure 11 As shown, when the two clamps 120 are open, the spindle 144 can easily enter between them, and after the two clamps 120 are closed, the spindle 144 is enclosed and fixed together with the purlin 110 in the middle region 114, including a portion of the abutment surface 1161.

[0082] refer to Figure 11 and Figure 3In some preferred embodiments, the distance between the two clamping members 120 at their pivotal mounting positions in the receiving groove 113 is a first distance L2, and the clamping members 120 are adapted to enclose and fix the main shaft 144, which is configured as a square cross-section torque tube. The width of the square cross-section of the main shaft 144 is a fifth width W5. The first distance L2 ranges from 80% to 100% of the fifth width W5. Preferably, the first distance L2 is set to 90% of the fifth width W5. On the one hand, the above arrangement is advantageous for achieving… Figure 11 The installation process is shown; on the other hand, the above-mentioned configuration, in conjunction with the square cross-section torque tube of the spindle 144, enables the clamp 120 to transmit force mainly at the diagonal of the spindle 144. Both the spindle 144 and the clamp 120 have high rigidity at the diagonal of the spindle 144 due to their curved cross-section structure, which is beneficial for reducing and dispersing stress.

[0083] like Figure 6A and Figure 8 As shown, in some preferred embodiments, the purlin 110 further includes two connecting regions 118, respectively disposed between the middle region 114 and the two end regions 115. The ends of the two clamping members 120 are pre-installed to the positions of the two first plates 111 located in the connecting regions 118 via pivot connectors. In each connecting region 118, the receiving groove 113 has a second width W2, which is adapted to the proximal width of the clamping member 120. Specifically, the second width W2 is slightly larger than the proximal width of the clamping member 120 to achieve a clearance fit, allowing the clamping member 120 to rotate and ensuring installation rigidity. Here, the second width W2 corresponds to... Figure 8 The second width W2 is shown here. For the sake of simplicity, the thickness of the first plate 111 is not considered here.

[0084] like Figure 12 As shown, the pivoting connector preferably uses pre-installed rivets 131, and the first plate 111 has an outwardly protruding flange 119 to enhance local rigidity and provide a rotational bearing for the pre-installed rivets 131. In other embodiments, the aforementioned connection area 118 may be omitted, and the clamp 120 may be pivotally fixed to the middle area 114 or the end area 115. For example, mounting platforms extending along the first direction X-X' and the third direction Z-Z' may be stamped on the first plate 111 in these areas for pivotally fixing the clamp 120. The advantage of pre-assembling in the workshop is that it can ensure the installation accuracy of the clamp 120 at the pivoting connection and reduce the difficulty of on-site installation.

[0085] As mentioned above, in some preferred embodiments, such as Figure 3 and Figure 11As shown, each clamp 120 is pivotally mounted in the receiving groove 113 by pre-installed rivets 131, allowing it to rotate to the point where most of it enters the receiving groove 113 for storage and transportation.

[0086] In some preferred embodiments, the purlin 110 is integrally formed by a stamping process. In some embodiments, the two clamping members 120 are integrally formed by a stamping process respectively. The above arrangement not only reduces costs but also facilitates lightweight design. In other embodiments, the purlin 110 and / or the clamping member 120 can also be manufactured by methods such as thermoforming or die casting.

[0087] like Figure 13 As shown, in some preferred embodiments, each clamp 120 has an overall C-shaped structure. Each clamp 120 includes a connecting portion 121, a mating portion 122, and a locking portion 123 connected sequentially along a third direction Z-Z'. The connecting portions 121 of two clamps 120 are bent relative to each other at the same end along a first direction X-X'. The connecting portions 121 are pivotally mounted on the first plate 111 by pre-installed rivets 131. The locking portions 123 of two clamps 120 are bent relative to each other at the same end along the first direction X-X'.

[0088] See Figure 11 The distance between the two clamping members 120 at the pivotal mounting position of the first plate 111 is a first distance L2. In the closed state of the two clamping members 120, the maximum distance between the two mating parts 122 is a second distance L3, and the first distance L2 is less than the second distance L3. Figure 3 Observation shows that the second distance L3 is actually the maximum width of the installation space S in the closed state. Meanwhile, from... Figure 11 and Figure 19 Observe that the second distance L3 matches the maximum width of the main shaft 144, i.e., the fifth width W5. Each connecting part 121 forms the end near the purlin 110, i.e., the proximal end; each locking part 123 forms the distal end. One side of each mating part 122 is adapted to fit and abut against the main shaft 144, i.e. Figure 11 The opposing inner sides are shown. After the bolt 132 passes through the two locking parts 123, it is locked by the nut 133 so that the purlin assembly 100 is fixed to the main shaft 144.

[0089] like Figure 14 As shown, in some preferred embodiments, each clamping member 120 is a stamped plate, including a bottom wall 124 and two wings 125 disposed on both sides of the bottom wall 124. The bottom wall 124 and the two wings 125 surround to form an opening groove 126, and the opening grooves 126 of the two clamping members 120 are arranged opposite to each other. At the locking part 123, as shown... Figure 15 Figure 16As shown, the two bottom walls 124 are respectively provided with opposing through holes 1241 for inserting bolts 132 and using nuts 133 to press and fix the clamp 120 to the main shaft 144; the heads of the bolts 132 and the nuts 133 are respectively confined within the corresponding opening slots 126. The confining of the nuts 133 also includes restricting their rotation within the opening slots 126. The nuts 133 can be in the form of square nuts, hexagonal nuts, etc. The bolts 132 can be of the type that is easy to automate installation, such as internal hexagonal heads or Torx heads.

[0090] In some preferred embodiments, the nut 133 is a weld nut and pre-welded to a clamp 120. These arrangements facilitate automated installation. Of course, standard fasteners such as rivets can also be used, or they can be inserted through the through hole 1241. As mentioned above, refer to... Figure 11 In some embodiments of this application, the final locking action can be completed with only one bolt 132. The additional opening groove 126 limits the head of the bolt 132 and the nut 133, which is more conducive to achieving automated installation.

[0091] like Figure 17 and Figure 18A As shown, in some preferred embodiments, at least one clamping member 120 has two sets of contraction portions 128 spaced apart along the extending direction of the clamping member 120 at its locking portion 123. The width of the opening groove 126 at each set of contraction portions 128 is reduced, forming a limiting cavity 129 between the two sets of contraction portions 128. The limiting cavity 129 is adapted to limit the position of the nut 133 in the extending direction and the width direction of the opening groove 126. Each set of contraction portions 128 includes two contraction portions 128 arranged opposite to each other in the second direction Y-Y', forming a four-corner distribution that forms the limiting cavity 129. The contraction portions 128 are formed by compression in the width direction. Figure 18B As shown, when a welded nut is not used, the limiting cavity 129 allows the nut 133 to be positioned more easily and accurately, which is beneficial for automated installation. Of course, the same setting can be made on both clamping parts 120, such as... Figure 18C As shown, this makes it easy to position the bolt 132 and makes the two clamps 120 have the same structure, thereby reducing the number of parts.

[0092] like Figure 4 As shown, this application also relates to a separately supplied purlin 110 for securing the photovoltaic module 20 to the main shaft 144 in conjunction with fixing devices such as clamps 120 and fastening components. The specific configuration of the purlin 110 has been described in detail in the foregoing embodiments and will not be repeated here.

[0093] like Figure 1 and Figure 2As shown, this application also relates to a photovoltaic support 10, including multiple columns 141, multiple column top seats 142, multiple bearing assemblies 143, and a main shaft 144. The multiple columns 141 and multiple column top seats 142 are installed in a one-to-one correspondence, the multiple bearing assemblies 143 are installed in a one-to-one correspondence with the multiple column top seats 142, and the main shaft 144 passes through the multiple bearing assemblies 143. The photovoltaic support 10 also includes purlin assemblies 100 from any of the aforementioned embodiments, wherein multiple purlin assemblies 100 are spaced apart on the main shaft 144 along its extension direction, and adjacent purlin assemblies 100 are used to support the photovoltaic module 20.

[0094] like Figure 19 As shown, in some preferred embodiments, the main shaft 144 is a square-section torque tube, specifically a rectangular tube with rounded corners. As mentioned earlier, the square section should also include square sections with rounded corners. The cross-section of the main shaft 144 includes four identical planar segments 147 and four identical arc segments 148, which are arranged alternately in the circumferential direction. Each clamp 120 of the purlin assembly 100 is adapted to cover at least two adjacent arc segments 148 and one planar segment 147 between them. Figure 11 As can be seen from the above, in some embodiments, each clamp 120 also covers... Figure 19 Part of another plane segment 147.

[0095] As explained earlier, the use of rectangular tubes with square cross-sections and the arrangement of each clamp 120 covering at least two arc segments 148 facilitates torque transmission and reduces stress levels. Figure 20 As shown (only a portion of the main shaft 144 is shown), after installation, during the process of the main shaft 144 driving the purlin assembly 100 and subsequently the photovoltaic module 20 (not shown in the figure), the torque is mainly transmitted to the clamp 120 through the diagonal position of the main shaft 144. The clamp 120 then transmits the torque to the connection area 118 of the purlin 110, and the purlin 110 then transmits the torque to the photovoltaic module 20 through the larger end area 115. Other structural features, such as the outward protrusion of the central area 114 and the third plate 116, all contribute to increasing structural rigidity and reducing peak stress.

[0096] In other embodiments, the cross-section of the main shaft 144 can also be rectangular, or other polygons besides triangles or rectangles, such as pentagons or hexagons, all of which may include rounded corners. It can also be an irregular cross-section.

[0097] The above description is merely a preferred embodiment and the technical principles employed in this application. Various obvious changes, readjustments, and substitutions can be made without departing from the concept of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. Where there is no conflict, the above embodiments and features in the embodiments can be combined with each other.

Claims

1. A purlin assembly (100), characterized in that, include: The purlin (110) includes two first plates (111) and one second plate (112); The second plate (112) extends along the first direction (X-X') and has a width in the second direction (Y-Y'). The two first plates (111) extend from the two edges of the second plate (112) in the second direction (Y-Y') toward the first side (D) of the second plate (112), thereby forming a receiving groove (113) together with the second plate (112). The second plate (112) is suitable for connecting photovoltaic modules (20). A fixing device, one end of which is located near the purlin (110) is disposed in the receiving groove (113), the fixing device being adapted to enclose and fix the main shaft (144) together with at least a portion of the purlin (110); The purlin (110) includes a central region (114) and two end regions (115) located on both sides of the central region (114) along the first direction (X-X'); in the central region (114), the second plate (112) forms a convex shape that is wider in the middle than at both ends, and in a cross section parallel to the first direction (X-X') and the second direction (Y-Y'), the two first plates (111) also form a convex shape that is wider in the middle than at both ends.

2. The purlin assembly (100) according to claim 1, characterized in that, In the central region (114), the overall shape of the second plate (112) is set as one of the following: truncated spindle shape, truncated rhombus shape, truncated ellipse shape, rectangle with trapezoidal narrowing at both ends, barrel shape with outward convex arc on the side, capsule shape with flattened ends, butterfly shape with Gaussian curve on the side, and composite outward convex shape with secondary protrusions on the side. In the central region (114), the maximum width of the second plate (112) is the first width (W1), the minimum width is the second width (W2), the length along the first direction (X-X') is the first length (L1), the ratio of the first width (W1) to the second width (W2) W1 / W2 is in the range of 1.5 to 3, and the ratio of the first length (L1) to the first width (W1) L1 / W1 is in the range of 2 to 4.

3. The purlin assembly (100) according to claim 1, characterized in that, It also includes two third plates (116), which extend outward along the second direction (Y-Y') from one end of the two first plates (111) away from the second plate (112); The third plate (116) is at least partially located in the central region (114) and is adapted to abut against the main shaft (144) to increase the contact area between the purlin (110) and the main shaft (144).

4. The purlin assembly (100) according to claim 3, characterized in that, The width of the third plate (116) in the second direction (Y-Y') gradually decreases from a middle position toward the two end regions (115). When viewed along the third direction (Z-Z'), the edge of the third plate (116) is convex arc-shaped, wherein the third direction (Z-Z') is perpendicular to the first direction (X-X') and the second direction (Y-Y').

5. The purlin assembly (100) according to claim 3, characterized in that, The abutting surface (1161) of the third plate (116) away from the second plate (112) is adapted to the outer surface of the spindle (144) and abuts against the spindle (144) after the spindle (144) is installed; In the central region (114), at least one reinforcing rib (117) is provided at the angle formed by each of the first plates (111) and the corresponding third plates (116).

6. The purlin assembly (100) according to claim 1, characterized in that, The second plate (112) is recessed toward the first side (D) in the middle region (114) relative to the end region (115), such that the second plate (112) abuts against the photovoltaic module (20) only in the end region (115); The second plate (112) has a groove (1121) extending along the first direction (X-X') in each end region (115).

7. The purlin assembly (100) according to claim 4, characterized in that, The minimum height of the first plate (111) in the end region (115) in the third direction (Z-Z') is the second height (H2), and the minimum height of the first plate (111) in the middle region (114) is the first height (H1), and the first height (H1) is greater than the second height (H2). The second plate (112) has two waist-shaped holes (1122) arranged at intervals along the second direction (Y-Y') in each end region (115).

8. The purlin assembly (100) according to any one of claims 1 to 7, characterized in that, The fixing device includes two clamps (120), wherein one clamp (120) is pivotally mounted on the first plate (111) at a distance from the end of the purlin (110) and the other clamp (120) is pivotally mounted on the end of the purlin (110) at a distance from the end of the purlin (110), so that the two clamps (120) can open and close relative to each other.

9. The purlin assembly (100) according to claim 8, characterized in that, The purlin (110) also includes two connecting regions (118), which are respectively disposed between the middle region (114) and the two end regions (115); The ends of the two clamping members (120) are pre-installed to the connection area (118) of the first plate (111) via a pivot connector.

10. The purlin assembly (100) according to claim 8, characterized in that, Each of the clamping components (120) has an overall C-shaped structure, and each of the clamping components (120) includes a connecting part (121), a mating part (122), and a locking part (123) connected sequentially along a third direction (Z-Z'); The connecting portions (121) of the two clamping members (120) are bent relative to each other along the first direction (X-X') at the same end, and the connecting portions (121) are pivotally mounted on the first plate (111) by pre-installed rivets (131); the locking portions (123) of the two clamping members (120) are bent relative to each other along the first direction (X-X') at the same end; The distance between the two clamping members (120) at the pivot mounting position of the first plate (111) is the first distance (L2). In the closed state, the maximum distance between the two mating parts (122) is the second distance (L3). The first distance (L2) is less than the second distance (L3).

11. The purlin assembly (100) according to claim 10, characterized in that, The purlin assembly also includes a fastening assembly comprising a bolt (132) and a nut (133), wherein the bolt (132) passes through the two locking parts (123) and is then locked by the nut (133) to fix the purlin assembly (100) to the main shaft (144).

12. The purlin assembly (100) according to claim 11, characterized in that, Each of the clamps (120) includes a bottom wall (124) and two wings (125) disposed on both sides of the bottom wall (124). The bottom wall (124) and the two wings (125) enclose an opening groove (126). The opening grooves (126) of the two clamps (120) are arranged opposite to each other. In the locking part (123), the two bottom walls (124) are respectively provided with opposite through holes (1241) for passing through the bolt (132) and pressing and fixing the clamp (120) with the main shaft (144) in conjunction with the nut (133); the head of the bolt (132) and the nut (133) are respectively limited in the corresponding opening groove (126).

13. The purlin assembly (100) according to claim 12, characterized in that, At least one of the clamping members (120) has a locking portion (123) with two sets of contraction portions (128) spaced apart along the extension direction of the clamping member (120). The width of the opening groove (126) at each set of contraction portions (128) is reduced, so that a limiting cavity (129) is formed between the two sets of contraction portions (128). The limiting cavity (129) is adapted to limit the position of the nut (133) in the extension direction and width direction of the opening groove (126).

14. A purlin (110) for fixing a photovoltaic module (20) to a main shaft (144), characterized in that, It includes two first plates (111) and one second plate (112); The second plate (112) extends along the first direction (X-X') and has a width in the second direction (Y-Y'). The two first plates (111) extend from the two edges of the second plate (112) in the second direction (Y-Y') toward the first side (D) of the second plate (112), thereby forming a receiving groove (113) together with the second plate (112). The second plate (112) is suitable for connecting photovoltaic modules (20). The receiving groove (113) is configured to accommodate one end of the fixing device near the purlin (110) within the receiving groove (113), thereby allowing a portion of the purlin (110) and the fixing device to enclose and fix the main shaft (144). The purlin (110) includes a central region (114) and two end regions (115) located on both sides of the central region (114) along the first direction (X-X'); in the central region (114), the second plate (112) forms a convex shape that is wider in the middle than at both ends, and in a cross section parallel to the first direction (X-X') and the second direction (Y-Y'), the two first plates (111) also form a convex shape that is wider in the middle than at both ends.

15. A photovoltaic bracket (10), comprising a plurality of columns (141), a plurality of column tops (142), a plurality of bearing assemblies (143), and a main shaft (144), wherein the plurality of columns (141) are installed in a one-to-one correspondence with the plurality of column tops (142), the plurality of bearing assemblies (143) are installed in a one-to-one correspondence with the plurality of column tops (142), and the main shaft (144) passes through the plurality of bearing assemblies (143), characterized in that, It also includes a purlin assembly (100) as described in any one of claims 1 to 13, wherein a plurality of the purlin assemblies (100) are spaced apart on the main shaft (144) along the extension direction of the main shaft (144), and two adjacent purlin assemblies (100) are used to support the photovoltaic module (20).

16. The photovoltaic bracket (10) according to claim 15, characterized in that, The main shaft (144) is a square cross-section torque tube. The cross-section of the main shaft (144) includes four identical planar segments (147) and four identical arc segments (148). The four planar segments (147) and the four arc segments (148) are arranged alternately along the circumference. Each clamp (120) of the purlin assembly is adapted to cover at least two adjacent arc segments (148) and one of the planar segments (147) between them.

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