Clamp for securing a photovoltaic module frame

Abstract

The invention relates to a clamp (100) for fastening a photovoltaic, PV, module frame (20) to a foundation structure (30). The PV module frame (20) comprises a portion (25) extending parallel to a light entry face of an installed PV module. A protrusion (27) extends within the portion (25). The clamp (100) comprises a clamping element (110) having at least one recess (111, 112) for accommodating the protrusion (27), and a clamping device (120) designed to exert a clamping force (F) on the PV module frame via the clamping element (110) when the PV module frame (20) is fastened to the foundation structure (30). The at least one recess (111, 112) is designed such that the clamping force (F) is exerted on the portion (25) at at least two pressure points (P1, P2) located on opposite sides of the protrusion (27) when the PV module frame (20) is fastened between the clamping element (110) and the foundation structure (30).

Description

Technical Field

[0001] This invention relates to a clamp for fixing a photovoltaic (PV) module frame and a method for fixing a PV module frame. Background Technology

[0002] Photovoltaic modules are secured to a base structure by their frames, which are designed to hold the modules in a specific position to utilize incident light as efficiently as possible. Ideally, the direction of light incidence is perpendicular to the light-incident surface of the photovoltaic module. On the one hand, the secure mounting of the photovoltaic modules to the base structure needs to be able to stably withstand loads (such as wind and snow loads). On the other hand, the photovoltaic modules should be easy to install or replace. For example, situations often arise where individual modules need to be replaced.

[0003] Existing methods for fixing photovoltaic module frames to the basic structure can only partially meet these requirements, or require a complex installation process that consumes a lot of time.

[0004] Therefore, an improved method for securing photovoltaic module frames is needed to solve the above problems. Summary of the Invention

[0005] The antenna technology disclosed in this patent document relates to wireless communication and can solve the technical problem of uneven power coverage of antenna arrays under different emission / reception angles. The disclosed antenna technology can also reduce hardware costs.

[0006] The above and other aspects and their implementations are described in more detail in the accompanying drawings, specification and claims.

[0007] At least some of the above problems are solved by a clamp for securing a photovoltaic (PV) module frame to a base structure and a corresponding securing method according to claim 11. The dependent claims relate to other advantageous configurations of the clamp or base structure.

[0008] This invention relates to a clamp for securing a photovoltaic (PV) module frame to a base structure. The PV module frame includes a portion extending parallel to the light incident surface of the mounted PV module, and a protrusion extending within this portion. The clamp includes: a clamping element having at least one recess for receiving the protrusion; and a clamping device designed to apply a clamping force to the PV module frame via the clamping element when secured to the base structure. The at least one recess is configured to apply a clamping force to the portion at at least two pressure points located on opposite sides of the protrusion when the PV module frame is secured between the clamping element and the base structure.

[0009] These two pressure points can be located on or adjacent to the raised slope. Multiple pressure points are located in a horizontal plane parallel to the surface of the photovoltaic module and spaced apart from each other in a direction perpendicular to the edge of the photovoltaic module. The direction of light incidence or its opposite direction can be defined as the vertical direction.

[0010] According to the embodiment, each groove forms exactly two pressure points on opposite sides. If the clamping element has two grooves for fixing the PV module frame (and possibly two grooves for fixing adjacent PV module frames), then according to this embodiment, the clamping element forms exactly four pressure points for fixing the PV module frame, that is, each groove corresponds to exactly two pressure points.

[0011] Optionally, the clamping element includes a beveled region configured to facilitate the insertion of the PV module frame between the clamping element and the base structure.

[0012] Optionally, at least one groove includes multiple grooves, wherein at least two opposing grooves are formed in a mirror symmetric manner to simultaneously fix two adjacent PV module frames to the base structure, and the PV module frames can be placed opposite each other along the insertion direction.

[0013] Optionally, the clamping element has a U-shaped structure, and at least one groove may include multiple grooves, wherein at least one groove is formed on each leg of the U-shaped structure.

[0014] Optionally, the clamp also includes a rotary locking element, which is formed as at least one protrusion on the clamping element for engaging with the base structure and preventing the clamping element from rotating relative to the base structure when the PV module frame is secured to the base structure. The rotary locking element may be formed, for example, as one or more pins, the cross-section of which may be of any shape (circular, triangular, quadrilateral, polygonal, etc.).

[0015] Optionally, the clamping element has an opening (threaded or unthreaded) that connects to a clamping device (such as a threaded bolt) to transmit clamping force to the clamping element.

[0016] Optionally, the distance between the groove and the side edge of the clamping element is equal to the horizontal extension of the protrusion, so that the side edge of the clamping element can directly contact the vertical portion of the PV module frame. This structure provides a support effect, thereby improving the overall stability of the PV module frame.

[0017] The embodiments also relate to a base structure for securing a photovoltaic (PV) module frame. The base structure includes a retaining body and at least one clamp as defined in this disclosure. The clamp is fastened to the retaining body such that a gap between the clamping element and the retaining body allows the PV module frame to be inserted between the retaining body and the clamping element.

[0018] Alternatively, the clamping device may be actuated from the side opposite to the light incident surface to generate a clamping force (e.g., tightening a threaded connection from below, where "below" should be understood relative to the vertical direction).

[0019] Other embodiments relate to a system for securing a photovoltaic module, the system comprising: a base structure as defined in this disclosure; and a photovoltaic module frame having a portion extending parallel to the light incident surface of the mounted photovoltaic module. A protrusion extends within this portion, wherein the protrusion is formed by a groove on an opposite side extending along the length direction of an edge of the photovoltaic module frame. The groove or the protrusion on the other side may be formed by pressing, embossing, or stamping, or by a grooving process.

[0020] Photovoltaic module frames can be specifically manufactured as single-layer structures, i.e., without cavities, for example, made from flat metal materials (through bending, stamping, embossing, etc.). The resulting photovoltaic module frames have a certain degree of flexibility, but can still be firmly fixed to the base structure through a two-point fixing method.

[0021] Other embodiments relate to a method for securing a photovoltaic (PV) module frame to a base structure using a clamp as defined in this disclosure. The method includes: - Prepare a PV module frame having a section that extends parallel to the light incident surface (i.e., horizontal direction) of the installed photovoltaic PV module and protrudes within that section. - Insert the PV module frame horizontally between the fixture and the foundation structure; and - A clamping force is applied between the clamping element and the base structure by means of a clamping device that actuates the clamping fixture.

[0022] "Horizontal insertion" should be understood as a relative translational movement between the PV module frame and the foundation structure with clamps. It should be understood that the PV module frame may remain stationary while the foundation structure moves; or conversely, the foundation structure may remain stationary while the PV module frame moves; or both may move relative to each other simultaneously. Therefore, "insertion" can also be understood as "sliding in" or "sliding between". In all cases, the result is the same: the PV module frame is positioned between the clamps and the foundation structure.

[0023] It should also be understood that the PV module frame is fixed together with the photovoltaic laminate held by the PV module frame. Optionally, the method therefore further includes the following steps: -After the PV module frame (as the first PV module frame) is fixed, another base structure with another clamp is slid horizontally to the fastening part of the fixed PV module frame; - Secure the PV module frame to the other base structure by tightening the other clamp.

[0024] Therefore, a PV module frame that is already fixed and holds the photovoltaic laminate can be gradually fixed laterally to another base structure, and then another PV module frame holding another photovoltaic laminate can be added laterally. The lateral addition can be achieved by sliding or moving, in which the fixed (secured) components remain stationary.

[0025] The embodiment overcomes the aforementioned problems by simultaneously securing the PV module frame at at least two holding points, with the PV module frame forming a protrusion (or groove) between these points. For this purpose, the clamp has one or more grooves for accommodating the protrusion of the PV module frame, thus forming a form-fit connection. The protrusion extends along the edge of the photovoltaic module, such that the two holding points are separated from each other in a direction perpendicular to the edge of the photovoltaic module. The protrusion in the PV module frame can, for example, be formed as a groove parallel to the edge of the photovoltaic module, and can be manufactured by pressing within the PV module frame or by bending the PV module frame (e.g., with a V-shaped structure). By securing the PV module frame to the base structure at two independent points separated from each other in a direction perpendicular to the module edge, high stability can be achieved because torsional dislodgement can be reliably prevented in the event of deflection (e.g., under tensile loads caused by wind).

[0026] According to an embodiment, one or more beveled areas are provided on the clamp, allowing the PV module frame to be easily inserted, thus enabling convenient installation. During insertion, the protrusions engage with one or more grooves to form a pre-fixed state. Finally, the clamp can be secured using a clamping device (such as a threaded connector), thereby pressing the clamp firmly onto the base structure.

[0027] Advantageously, the PV module frames are manufactured in a C-shape or U-shape, and according to other embodiments, a single clamp can simultaneously secure two spatially adjacent PV module frames. For this purpose, the clamp can, for example, secure the left and right PV module frames to the base structure. Once the two adjacent PV module frames are inserted, the clamping device can be reactivated to simultaneously hold the two PV module frames to the base structure using a form-fit and force-fit method (i.e., at two or four independent holding points on each PV module frame). This structure allows the two PV module frames to be installed very tightly together, thereby minimizing the gap between the frames. Using the C-shape or U-shape, the PV module frames can, in principle, even fit together completely without gaps. This allows for maximum light energy utilization, maximizing the use of incident light for power generation. Attached Figure Description

[0028] Embodiments of the invention will be better understood from the following detailed description and accompanying drawings; however, these detailed descriptions and drawings should not be construed as limiting the present disclosure to the particular embodiments, but are for explanation and understanding only.

[0029] Figure 1 A fixture for securing a modular frame to a base structure according to an embodiment of the present invention is shown.

[0030] Figures 2A to 2C Details of the clamp according to other embodiments are shown.

[0031] Figure 3 The PV module frame is shown being secured to the base structure via this clamp.

[0032] Figure 4 shows a schematic diagram of adjacent modules being fixed to the foundation structure. Detailed Implementation

[0033] Figure 1 A clamp 100 for securing a PV module frame 20 to a base structure 30 according to an embodiment of the present invention is shown. The base structure 30 includes, for example, a (planar) retaining body 32 on which the securing operation is performed. The PV module frame 20 includes a fixture for retaining a photovoltaic module (PV module). Figure 1 The fixture 100 includes a clamping portion 22 (not shown) and a portion 25 extending parallel to the light incident surface, wherein light is incident vertically from above. A protrusion 27 is formed within the portion 25, which can be made into a V-shape. The fixture 100 includes a clamping element 110 and a clamping device 120. The clamping element 110 has grooves 111, 112 for receiving the protrusion 27 of the PV module frame 20. The clamping device 120 is designed to apply a clamping force F to the PV module frame 20 via the clamping element 110 when it is fixed to the holding body 32 of the base structure 30.

[0034] The clamping element 110, having grooves 111 and 112, is configured to apply a clamping force F to opposite sides of the protrusion 27 on portion 25 when the PV module frame 20 is fixed between the clamping element 110 and the base structure 30. Therefore, the clamping force F between the PV module frame 20 and the base structure 30 is not applied at a single point, but rather through the clamp 100 at at least two independent first pressure points P1 and second pressure points P2. The protrusion 27 of the PV module frame 20 is located between pressure points P1 and P2 (see [reference needed]). Figure 1(Right side). This two-point fixing method achieves high stability, preventing the PV module frame 20 from twisting and coming off. Even with a small clamping force F, the PV module frame 20 will not loosen because the protrusion 27 is always engaged within the groove 111 (forming a shape-fit connection). In conventional clamping devices, the PV module frame is clamped in only one position, which can easily lead to loosening.

[0035] According to other embodiments, the clamping element 110 includes one or more beveled regions 115 configured to facilitate the insertion of the PV module frame 20 between the clamping element 110 and the base structure 30 along the insertion direction R. For example, the angle of the beveled region 115 may be equal to the angle of the V-shaped protrusion 27. This facilitates smooth sliding.

[0036] In the illustrated example embodiment, the clamping device 120 includes, for example, a bolt 125 that engages with the threaded clamping element 110 and passes through an opening in the retaining body 32. This allows for fixation from the lower side of the PV module frame 20 (away from the light incident side). Through the threaded connection, the clamp 100 is pulled downwards by the threaded engagement, thereby applying a clamping force F. The advantage of fixing from below is that, in open-field installations, the fixation can be easily released from below to install or replace the photovoltaic module.

[0037] According to other embodiments, it can also be fixed from above, in which case the clamping element only needs to be provided with an opening, while the thread or nut is provided in the base structure.

[0038] In the illustrated embodiment, the PV module frame 20 has a C-shaped or U-shaped cross-section (cut along a plane perpendicular to the frame direction), wherein the lower part of the C-shaped structure constitutes part 25, and the upper part constitutes clamping part 22. The advantage of this structure is that the spacing between photovoltaic modules can be chosen to be arbitrarily small (e.g., by increasing the depth of the C-shaped structure). If fixed from below, gapless installation between photovoltaic modules can be achieved.

[0039] As previously mentioned, the advantage of the beveled region 115 is that it allows for convenient insertion, making the installation of the photovoltaic module quick and reliable. For example, the clamp 100 can be pre-fixed to the base structure 30, i.e., leaving a certain distance or gap 35 between the clamping element 110 and the frame 20. The gap 35 can be selected to just allow the PV module frame 20 to be inserted. In this way, the PV module frame 20 can be temporarily fixed after the photovoltaic frame 20 is inserted and the protrusion 27 is received by the groove 111. The same process can be repeated on the other side for another PV module frame. Finally, the clamping device 120 can be actuated. The resulting clamping force F will reliably fix the two photovoltaic modules.

[0040] The clamping device 120 can generate the required clamping force F in a variety of ways, many of which are well known to those skilled in the art. For example, any one or a combination of the following methods can be used: - Long screw with nut (from above and / or below) - Threaded bolts with nuts (from top and / or bottom) - The long screw is threaded in the clamp 100 or in the base structure 30. - The reverse bolt and the additional thread connected to the clamping element 110, - A threaded rod connected to the clamping element 110 or the base structure 30, with one or more nuts at the end of the rod.

[0041] Figures 2A to 2C An enlarged schematic diagram and further details of a clamp 100 according to other embodiments are shown, wherein Figure 2A This is a three-dimensional view. Figure 2B This is a side view viewed from direction B. Figure 2C This is a side view in the C direction.

[0042] In the illustrated embodiment, the clamp 100 includes an additional rotary locking element 130 (see...). Figure 2B The rotation locking element 130 may, for example, consist of at least one protruding pin or other protruding structure, which may be embedded in, for example, the base structure 30. The pin 130 may be biased relative to the clamping device 120 so as to prevent relative rotation between the clamp 100 and the base structure 30 by being embedded in the base structure 30. The base structure 30 may be provided with corresponding openings or holes for the rotation locking element 130 to be embedded in. In this way, rotation of the clamp 100 relative to the base structure 30 will no longer be possible, because although the clamping device 120 is allowed to rotate about its own axis, this rotation will be prevented by the rotation locking element 130 biased relative to the clamping device.

[0043] Furthermore, according to the illustrated embodiment, the clamp 100 may have a threaded opening 117 provided on the clamping element 110 (see...). Figure 2A ), for example, can make Figure 1 The bolt is screwed into the opening, and when securing the PV module frame 20, the clamp 100 is pulled toward the base structure 30, thereby clamping the PV module frame 20 placed therebetween. However, the opening does not necessarily have to be threaded. For example, the bolt can also be inserted from above, with its head abutting against the flange shown in the opening 117 and engaging with a nut or the threads of the base structure 30 from below. In this case, the clamping operation can be achieved by rotating the bolt from above.

[0044] According to the illustrated embodiment, the clamping element 110 is made into a U-shaped structure (see...). Figure 2BThe U-shaped clamping element 110 has two grooves 111a, 111b, and 112 on each of its two opposite legs (only three are visible in the figure), giving the clamping element 110 a total of four grooves. Each of the two adjacent PV module frames 20 corresponds to two grooves. The technical effect of this structure is that the U-shaped structure undergoes slight elastic deformation when subjected to clamping force F, giving the clamping element 110 inherent elasticity, thereby counteracting the loosening tendency of the clamping device 120.

[0045] The illustrated embodiment (see Figure 2C The clamping element 110 has a central recess 113 on each of its two opposing legs. The technical effect of these recesses 113 is that, since the recesses 113 reduce the force-bearing surface of the clamping element 110 on the portion 25 of the PV module frame 20, the contact pressure at each independent pressure point P1, P2 between the clamping element 110 and the holding body 32 is increased.

[0046] Figure 3 A spatial view is shown of the PV module frame 20 being secured to the base structure 30 by clamp 100. In the illustrated embodiment, protrusion 27 is formed in the form of a groove on the opposite side of the PV module frame 20 and engages with recess 111. Currently, it is secured from below by bolt 125, which, in an exemplary manner, is screwed into the threaded opening 117 of clamping element 110.

[0047] The clamping element 110 is also made into a U-shaped structure, wherein each leg of the clamping element 110 secures the protrusion 25 of the PV module frame 20 at two separate pressure points P1 and P2. These four pressure points P1 and P2 provide high stability. Since this part 25 is almost impossible to break, the planar part 25 of the PV module frame 20 also provides reliable fixation.

[0048] Figures 4A to 4E An example process is shown for securing two adjacent PV module frames 20a, 20b to the infrastructure 30.

[0049] Figure 4A The steps for preparing the first PV module frame 20a and the base structure 30 are shown, at which point the clamping element 110, together with the clamping device 120, has been fixed to the base structure 30. The clamping device 120 is not yet activated, so the clamping force F has not yet been applied. Therefore, the clamping element 110 can be lifted from the base structure 30 to form a gap 35. For example, the bolt 125 can be pushed upward according to the gap size to insert the first PV module frame 20a.

[0050] Figure 4BThe steps for inserting the first PV module frame 20a between the clamping element 110 and the base structure 30 are shown. During insertion, the clamping element 110 is pushed vertically upward through the inclined region 115, and the protrusion 27a of the first PV module frame 20a engages with the groove 111. After insertion, the clamping element 110 moves upward by the thickness of a portion 25 of the PV module frame 20a, at which point the first PV module frame 20a is temporarily fixed.

[0051] Figure 4C The steps for preparing the second PV module frame 20b on the opposite side are shown. The second PV module frame 20b is mirror-symmetrical to the first PV module frame 20a and also includes a protrusion 27b for fixing in the second groove 112 of the clamping element 110.

[0052] Figure 4D The steps for inserting the second PV module frame 20b are shown. The second PV module frame 20b is also inserted horizontally, that is, inserted again between the clamping element 110 and the base structure 30. As a result, the two adjacent PV module frames 20a and 20b on both sides of the clamping element 110 are inserted between the clamping element 110 and the base structure 30, until the protrusions 27a and 27b are respectively engaged in the grooves 111 and 112.

[0053] Figure 4E The steps of applying a clamping force F via the clamping device 120 are shown. For this purpose, for example, the clamping force F can be applied between the clamping element 110 and the base structure 30 by tightening the bolt 125 from below, thereby clamping the PV module frames 20a, 20b located therebetween.

[0054] Therefore, several embodiments also relate to a method for securing a PV module frame 20 to a base structure 30, the method performing... Figures 4A to 4E At least some of the steps in.

[0055] Advantageously, the PV module frames 20a and 20b are made into a U-shaped or C-shaped structure, wherein the clamping part 22 is formed on one leg (upper part in FIG. 4) for fixing the photovoltaic module. The opposite leg (lower part in FIG. 4) is a part 25 with a protrusion 27. The technical effect of this structure is that the spacing between adjacent photovoltaic modules can be flexibly adjusted by selecting the depth of the U-shaped or C-shaped structure. For example, the spacing can be intentionally set large enough to allow access to the clamping device 120 (such as bolt 125 or nut) from above. However, if fixing from below is not a problem, the spacing can also be selected to be arbitrarily small (or even completely eliminated).

[0056] The embodiments provide the following advantages: - The PV module frame can be assembled from the back; - Two grooves are formed in the clamping element 110 for clamping the lower module support leg 25 of the PV module, wherein the existing grooves or protrusions are fixed on the left and right sides of the grooves to prevent slippage. - The beveled areas 115 on both sides of the clamping element 110 allow the PV module frame 20 with protrusions 27 to slide in from under the pre-assembled clamping element 110. - A protrusion or boss can be provided in the hollow part of the base structure 30 to form a rotation locking member 130, which prevents the clamp 100 from rotating during assembly; - The thread can be integrated into the clamping element 110, thereby enabling the clamp 110 to be pre-assembled in a rotationally secure manner.

[0057] The features of the invention disclosed in the specification, claims, and drawings, whether individually or in any combination, are essential for the realization of the invention.

[0058] List of reference numerals 20 Photovoltaic (PV) Module Frame Clamping part of 22PV module Part of the 25PV module frame 27 protrusions 30 Basic Structure 32 Maintain the main body 35 gap 100 clamps 110 clamping element 111, 112 or one or more grooves 113 One or more depressions 115 Sloping area (insert auxiliary) 117 Opening (with or without threads) 120 clamping device 125 bolts 130 Rotary Locking Part F Clamping force Pressure points on the P1 and P2PV module frames Distance of groove A from the edge of the clamping element

Claims

1. A clamp (100) for holding a photovoltaic (PV) module frame (20) to a base structure (30), wherein, The PV module frame (20) has a portion (25) extending parallel to the light incident surface of the installed photovoltaic module, and a protrusion (27) extending within the portion (25). The clamp (100) includes: A clamping element (110) having at least one groove (111, 112) for receiving the protrusion (27); and A clamping device (120) is designed to apply a clamping force (F) to the PV module frame (20) via the clamping element (110) when the PV module frame (20) is fixed to the base structure (30). The at least one groove (111, 112) is designed such that when the PV module frame (20) is fixed between the clamping element (110) and the base structure (30), the clamping force (F) is applied to the portion (25) at at least two pressure points (P1, P2) located on opposite sides of the protrusion (27).

2. The clamp (100) according to claim 1, wherein, The clamping element (110) also has a beveled region (115) configured to facilitate the insertion of the PV module frame (20) between the clamping element (110) and the base structure (30).

3. The clamp (100) according to claim 1 or 2, wherein, The at least one groove (111, 112) includes a plurality of grooves, wherein at least two opposing grooves (111, 112) are formed in a mirror symmetry to simultaneously fix two adjacent PV module frames (20a, 20b) onto the base structure (30).

4. The clamp (100) according to any one of the preceding claims, wherein, The clamping element (110) has a U-shaped structure, and the at least one groove (111, 112) includes a plurality of grooves (111a, 111b), wherein at least one groove (111a, 111b) is formed on each leg of the U-shaped structure.

5. The clamp (100) according to any of the preceding claims further includes a rotation locking member (130), the rotation locking member (130) being formed as at least one protrusion on the clamping element (110) for engaging the base structure (30) and preventing the clamping element (110) from rotating relative to the base structure (30) when the PV module frame (20) is fixed to the base structure (30).

6. The clamp (100) according to any one of the preceding claims, wherein, The clamping element (110) has an opening (117), particularly a threaded opening, which is connected to the clamping device (120) to transmit the clamping force (F) to the clamping element (110).

7. The clamp (100) according to any one of the preceding claims, wherein, The distance (A) between the groove (111, 112) and the side edge of the clamping element (110) is equal to the horizontal extension of the portion (25) to the protrusion (27), so that the side edge of the clamping element (110) can directly contact the vertical portion of the PV module frame (20).

8. A foundation structure (30) for fixing a photovoltaic (PV) module frame (20), the foundation structure (30) comprising: Maintain the main body (32); and At least one clamp (100) according to any one of the preceding claims is fixed to the retaining body (32) such that the gap (35) between the clamping element (110) and the retaining body (32) allows the PV module frame (20) to be inserted between the retaining body (32) and the clamping element (110).

9. The basic structure (30) according to claim 8, wherein, The clamping device (120) is actuated from the side opposite to the light incident surface to generate the clamping force (F).

10. A system for fixing photovoltaic modules, comprising: The basic structure (30) according to claim 8 or 9; and A photovoltaic module frame (20) has a portion (25) extending parallel to the light incident surface of the installed photovoltaic module, and a protrusion (27) extending within the portion (25), the protrusion (27) being formed by a groove located on the opposite side, the groove extending longitudinally along the edge of the photovoltaic module frame (20).

11. A method for securing a photovoltaic (PV) module frame (20) to a base structure (30), the method being performed using a clamp (100) according to claim 1, the method comprising: The PV module frame (20) is provided, the PV module frame (20) having a portion (25) and a protrusion (27) extending within the portion (25), the portion (25) extending parallel to the light incident surface of the installed photovoltaic module; The PV module frame (20) is horizontally inserted between the clamp (100) and the base structure (30); as well as The clamping force (F) is applied between the clamping element (110) and the base structure (30) by actuating the clamping device (120) of the clamp (100).

12. The method according to claim 11, wherein, Perform the following steps: After the PV module frame (20) is fixed, another base structure with another clamp is horizontally slid onto the portion (25) of the fixed PV module frame (20) having the protrusion (27); The PV module frame (20) is secured to the other base structure by fastening the other clamp.

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