Supporting structure of photovoltaic module

The supporting structure addresses the challenges of mobility and heat dissipation in photovoltaic modules by incorporating a frame with wheels and adjustable ventilation slots, ensuring easy transfer and efficient heat management.

CN119109415AInactive Publication Date: 2024-12-10JIANGSU YAMEITE NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202411327241.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-23
Publication Date
2024-12-10
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing photovoltaic module support structures are cumbersome to move and disassemble, and they lack effective heat dissipation mechanisms, particularly relying on air flow which is inefficient in managing the heat generated during sunlight conversion.

Method used

A supporting structure with a mounting frame equipped with universal wheels, an electric turntable, photosensitive sensor, and adjustable ventilation slots with swing plates and guide shells to facilitate easy movement, positioning, and enhanced heat dissipation through controlled air flow and negative pressure.

Benefits of technology

Enables quick assembly and disassembly of photovoltaic modules and enhances heat dissipation efficiency by adapting air flow rates and forming negative pressure to effectively discharge heat, especially under varying wind conditions.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of photovoltaic modules, in particular to a supporting structure of a photovoltaic module. The invention aims to provide a photovoltaic module supporting structure which comprises a mounting frame, universal wheels are mounted at the bottom of the mounting frame, an electric rotating disc is arranged in the middle of the mounting frame, a photosensitive sensor is arranged on the side wall of the mounting frame, and a module containing frame is rotationally connected to one side of the upper portion of the mounting frame. Electric push rods which are symmetrically distributed are rotationally connected to the mounting frame, the telescopic ends of the electric push rods are hinged to the bottom of the module containing frame, and a control module connected with a remote control terminal through the Internet of Things is arranged on the mounting frame. According to the invention, the heat dissipation efficiency of the photovoltaic module is improved by changing the air circulation amount when the wind power is large.
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Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic modules, and in particular to a supporting structure of a photovoltaic module. Background Art

[0002] Photovoltaic module is a device that converts solar energy into electrical energy. It is mostly used in situations where solar power generation is used, such as solar power plants, solar street lights, etc.

[0003] The existing photovoltaic module support structure mostly uses a steel structure frame to support and fix the photovoltaic module. After the photovoltaic module is fixed in the form of a steel structure frame, it is cumbersome to move and disassemble it, and it is not convenient to quickly transfer and disassemble the photovoltaic module. In addition, when the existing photovoltaic module generates electricity through sunlight, a large amount of heat is generated. The photovoltaic module fixed on the steel structure frame only realizes the heat dissipation speed through the speed of air flow, and the existing steel structure cannot assist the photovoltaic module in heat dissipation. Summary of the invention

[0004] In order to overcome the shortcomings mentioned in the above background technology, an object of the present invention is to provide a supporting structure for a photovoltaic module.

[0005] The technical solution of the present invention is: a supporting structure of a photovoltaic module, comprising a mounting frame, a universal wheel is installed at the bottom of the mounting frame, an electric turntable is arranged in the middle of the mounting frame, a photosensitive sensor is arranged on the side wall of the mounting frame, a module holding frame is rotatably connected to one side of the upper part of the mounting frame, a symmetrically distributed electric push rod is rotatably connected to the mounting frame, a telescopic end of the electric push rod is hinged to the bottom of the module holding frame, a control module connected to a remote control terminal through the Internet of Things is arranged on the mounting frame, a slide groove equidistantly distributed in the circumferential direction is provided on the upper side surface of the module holding frame, and a fixing component for positioning the photovoltaic module is arranged on the module holding frame, a slot is provided on the module holding frame, a ventilation slot connected to the slot is provided inside the module holding frame, a through hole equidistantly distributed is provided on the module holding frame, the through hole is connected to the ventilation slot, and an adjustment component for changing the air flow rate is arranged in the ventilation slot, and the electric turntable, the photosensitive sensor and the fixing component are all electrically connected to the control module.

[0006] More preferably, the fixing assembly includes an electromagnetic part fixedly connected to the slide groove, the electromagnetic part is electrically connected to the control module, a sliding block is slidably connected to the slide groove, a side wall of the sliding block is fixedly connected to a magnetic part cooperating with the electromagnetic part, the top of the sliding block is fixedly connected to a mounting plate, the top of the mounting plate is fixedly connected to a positioning plate, a pressure trigger electrically connected to the control module is embedded in the positioning plate, support strips are fixedly connected to the upper side surface of the module holding rack at equal intervals in the circumferential direction, and the support strips are made of rubber, a pressure sensor electrically connected to the control module is provided on the inner side of the support strip, and a power part for driving the sliding block to move is installed at the bottom of the module holding rack.

[0007] More preferably, the upper side surface of the support bar and the upper side surface of the mounting plate are at the same height, so as to facilitate the fixing of the corners of the photovoltaic module by the locking plate.

[0008] More preferably, the power component includes a reduction motor fixed to the bottom of the module holding frame through a connecting frame, the reduction motor is electrically connected to the control module, the output shaft of the reduction motor is equipped with a winding wheel, and the other side wall of the sliding block is fixed with a first pull rope, and the first pull rope passes through the module holding frame and is fixed to the winding wheel.

[0009] More preferably, the adjustment assembly includes two groups of symmetrically arranged swing plates, the two groups of swing plates are arranged in the ventilation slot, a guide shell is provided in the middle of the ventilation slot, the guide shell is located between the two groups of swing plates, guide wheels are installed on both side walls of the module holding rack, both sides of the bottom of the module holding rack are rotatably connected with wind shields through shafts, a torsion spring is sleeved on the shaft of the wind shield, both ends of the torsion spring are respectively fixed to the wind shield and the module holding rack, a second pull rope is connected between the two wind shields, a strip groove is provided on the guide shell for vertically sliding cooperation with the second pull rope, the second pull rope passes around the corresponding guide wheel and is connected to the swing plate, and a pushing member is fixed between the guide shell and the second pull rope.

[0010] More preferably, the side of the guide shell facing the swing plate is arranged as an arc-shaped surface to facilitate air guidance.

[0011] More preferably, the length of each group of the swing plates gradually decreases towards the middle of the module holding rack, vents are provided on the swing plates, and the vents on adjacent swing plates are staggered to extend the air flow time, and the swing plates and the through holes are staggered to extend the air flow time.

[0012] More preferably, the cross-sectional width of the ventilation slot gradually decreases toward the middle thereof, so as to accelerate air circulation and form negative pressure to generate suction.

[0013] More preferably, the connection between the second pull rope and the swing plate is located on the upper side of the swing plate, so as to facilitate pulling the swing plate to swing and expand the ventilation area of ​​the ventilation slot.

[0014] More preferably, the pushing member includes a fixing plate symmetrically fixed to the top of the guide shell, V-shaped grooves are provided on opposite sides of the symmetrically distributed fixing plates, guide rods are slidably provided between the symmetrically distributed V-shaped grooves, and the guide rods are fixed to the second pull rope.

[0015] The present invention winds up the first pull rope when the reduction motor is working, so that the four locking plates move inward to achieve the centering fixation of the photovoltaic module. When the wind force is strong, the wind shield plate swings and drives the guide rod to move through the second pull rope to move the guide shell upward to open the ventilation slot. After the swing plate swings, the space in the ventilation slot is opened, so that the circulation of air in the ventilation slot is increased. Because the cross-sectional width of the ventilation slot gradually decreases toward the middle, the air in the ventilation slot can be accelerated when passing through the position with a smaller cross-section. If the air flows too fast, the pressure in the ventilation slot will be reduced and negative pressure will be gradually formed. When negative pressure is formed in the ventilation slot, the air between the module holding rack and the photovoltaic module can be drawn downward, and the heat generated by the photovoltaic module can be driven downward and discharged. Therefore, when the wind force is strong, the heat dissipation efficiency of the photovoltaic module can be accelerated by changing the air circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure when viewed from above of the present invention.

[0018] Figure 3 It is a top view of the three-dimensional structure of the module holding rack of the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the power component of the present invention.

[0020] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the module holding rack of the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the windshield of the present invention.

[0022] Figure 7 For the present invention Figure 6 A is an enlarged schematic diagram of the three-dimensional structure.

[0023] Among them, the above-mentioned drawings include the following reference numerals: 1 - mounting bracket, 2 - universal wheel, 3 - electric turntable, 4 - photosensitive sensor, 5 - module storage rack, 6 - electric push rod, 7 - control module, 8 - chute, 9 - electromagnetic component, 10 - sliding block, 11 - magnetic component, 12 - mounting plate, 13 - clamping plate, 14 - reduction motor, 15 - wire winding wheel, 16 - first pulling rope, 17 - support bar, 18 - slot, 19 - ventilation slot, 20 - through hole, 21 - swing plate, 22 - diversion shell, 23 - guide wheel, 24 - wind baffle, 25 - second pulling rope, 26 - fixing plate, 27 - V-shaped groove, 28 - guide rod. Detailed implementation manners

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figure 1-Figure 7 As shown, a support structure for a photovoltaic module includes a mounting bracket 1. Three universal wheels 2 are installed at the bottom of the mounting bracket 1, and the three universal wheels 2 are distributed in a "pin" shape structure. An electric turntable 3 is arranged in the middle of the mounting bracket 1. A photosensitive sensor 4 is arranged on the left side wall of the mounting bracket 1. A module storage rack 5 is rotatably connected to the upper left part of the mounting bracket 1. A rubber roller is arranged on the upper right part of the mounting bracket 1, and the rubber roller on the mounting bracket 1 is used to buffer the process of the module storage rack 5 swinging back to its position. Two symmetrically distributed electric push rods 6 are rotatably connected to the mounting bracket 1, and the telescopic ends of the electric push rods 6 are hinged to the bottom of the module storage rack 5. A control module 7 connected to a remote control terminal through the Internet of Things is arranged on the mounting bracket 1. Four chutes 8 are opened on the upper side surface of the module storage rack 5, and the four chutes 8 are distributed in a rectangular shape. And a fixing component for positioning the photovoltaic module is arranged on the module storage rack 5. A slot 18 is opened at the central position of the module storage rack 5. A ventilation slot 19 communicating with the slot 18 is opened inside the module storage rack 5. Through holes 20 are opened on the module storage rack 5 at equal intervals, and the through holes 20 communicate with the ventilation slot 19. The cross-sectional width of the ventilation slot 19 gradually decreases towards the middle thereof, which is used to accelerate air flow to form negative pressure to generate suction force. And an adjusting component for changing the air flow rate is arranged in the ventilation slot 19. The electric turntable 3, the photosensitive sensor 4 and the fixing component are all electrically connected to the control module 7.

[0026] The fixing assembly includes an electromagnetic member 9 fixedly connected to the slide slot 8, the electromagnetic member 9 is electrically connected to the control module 7, a sliding block 10 is slidably connected to the slide slot 8, a magnetic member 11 cooperating with the electromagnetic member 9 is fixedly connected to the outer wall of the sliding block 10, a mounting plate 12 is fixedly connected to the top of the sliding block 10, a clamping plate 13 is fixedly connected to the top of the mounting plate 12, a pressure trigger electrically connected to the control module 7 is embedded on the clamping plate 13, four support bars 17 are fixedly connected to the upper side of the module holding frame 5, and the support bars 17 are made of rubber, and the upper side of the support bar 17 is at the upper side of the mounting plate 12. The same height makes it easy for the locking plate 13 to fix the corners of the photovoltaic module. A pressure sensor electrically connected to the control module 7 is provided on the inner side of the support bar 17. After the photovoltaic module is placed on the support bar 17, the pressure sensor in the support bar 17 is triggered by the gravity of the photovoltaic module, and the pressure sensor transmits the data to the control module 7. A power part for driving the sliding block 10 to move is installed at the bottom of the module holding rack 5. When the locking plate 13 contacts the photovoltaic module, the pressure trigger will be triggered. When the pressure value sensed by the pressure trigger reaches the set value, the control module 7 will turn off the power part.

[0027] The power component includes a reduction motor 14 fixed to the bottom of the module holding frame 5 through a connecting frame, the reduction motor 14 is electrically connected to the control module 7, the output shaft of the reduction motor 14 is installed with a winding wheel 15, the inner side wall of the sliding block 10 is fixed with a first pull rope 16, the first pull rope 16 passes through the module holding frame 5 and is fixed to the winding wheel 15, and the reduction motor 14 reels the first pull rope 16 when working, and when the first pull rope 16 is reeled, it will pull the sliding block 10 to move toward the photovoltaic module, and the sliding block 10 moves through the mounting plate 12 thereon to drive the positioning plate 13 to move, and for this purpose, the four corners of the photovoltaic module can be positioned and fixed by the four positioning plates 13.

[0028] The adjustment component includes two groups of symmetrically arranged swing plates 21, and the length of each group of swing plates 21 gradually decreases toward the middle of the module holding rack 5. The swing plates 21 and the through holes 20 are staggered to extend the air flow time. The two groups of swing plates 21 are symmetrically arranged in the ventilation slot 19. Ventilation holes are provided on the swing plates 21, and the vents on adjacent swing plates 21 are staggered to extend the air flow time. A guide shell 22 is provided in the middle of the ventilation slot 19. The guide shell 22 is set to an arc surface on one side of the swing plate 21 to facilitate air diversion. The front and rear side walls of the module holding rack 5 are both equipped with guide wheels 23. The front and rear sides of the bottom of the frame 5 are rotatably connected to the wind shield 24 through an axle rod, and a torsion spring is sleeved on the axle rod of the wind shield 24. The two ends of the torsion spring are respectively fixed to the wind shield 24 and the module holding frame 5. A second pull rope 25 is connected between the outer side surfaces of the front and rear wind shields 24. A strip groove that vertically slides with the second pull rope 25 is opened on the guide shell 22. The second pull rope 25 bypasses the corresponding guide wheel 23 and is connected to the swing plate 21. The connection between the second pull rope 25 and the swing plate 21 is located on the upper side of the swing plate 21, which is convenient for pulling the swing plate 21 to swing and expand the ventilation area of ​​the ventilation slot 19. A pushing member is fixed between the guide shell 22 and the second pull rope 25.

[0029] The pusher includes a fixing plate 26 symmetrically fixed to the top of the guide shell 22 , V-shaped grooves 27 are formed on opposite sides of the symmetrically distributed fixing plates 26 , guide rods 28 are slidably provided between the symmetrically distributed V-shaped grooves 27 , and the guide rods 28 are fixed to the second pull rope 25 .

[0030] When in use, the user places the photovoltaic module on the upper side of the module holding frame 5. At this time, the photovoltaic module is located on the upper side of the support bar 17. The support bar 17 can support the bottom of the photovoltaic module to prevent the photovoltaic module from colliding with the module holding frame 5 when placed, causing damage to the photovoltaic module. After the photovoltaic module is placed on the support bar 17, the pressure sensor in the support bar 17 is triggered by the weight of the photovoltaic module. The pressure sensor transmits data to the control module 7. The control module 7 starts the reduction motor 14 according to the data sent back. When the reduction motor 14 is working, the first pull rope 16 is reeled in. When the first pull rope 16 is reeled in, it will pull the sliding block 10 to move toward the photovoltaic module. The sliding block 10 moves through the mounting plate 12 thereon to drive the positioning plate 13 to move. For this reason, the four corners of the photovoltaic module can be fixed by the four positioning plates 13, and the centering of the photovoltaic module can be achieved by the four positioning plates 13. In this process, the positioning plate 1 After the locking plate 13 contacts the corner of the photovoltaic module, the locking plate 13 continues to move. At this time, the pressure trigger on the locking plate 13 transmits the pressure value to the control module 7. When the pressure value sensed by the pressure trigger reaches the set value, the control module 7 turns off the reduction motor 14 (after the reduction motor 14 is turned off, the output shaft thereon will be self-locking, so as to avoid the output shaft of the reduction motor 14 from rotating by itself, thereby affecting the fixation of the photovoltaic module). After the above steps are completed, the photosensitive sensor 4 works to sense sunlight and transmits the information to the control module 7. The control module 7 starts the electric turntable 3 and the electric push rod 6 according to the information of the photosensitive sensor 4 and the local longitude and latitude information. The electric turntable 3 works to drive the mounting frame 1 to rotate circumferentially, so that the photovoltaic module can rotate in the direction of sunlight. The electric push rod 6 works to tilt and swing the module holding frame 5, so that the tilt angle of the photovoltaic module can be adjusted, so that the photovoltaic module is always in a higher sunlight conversion efficiency mode.

[0031] When dissipating the heat generated by the photovoltaic module, there are two modes. When the wind is small or there is no wind (the wind is not strong enough to drive the wind shield 24 to rotate), after the air flows into the ventilation slot 19, because the swing plate 21 is in a vertical state at this time, the swing plate 21 is still in an upright state at this time. The upright state of the swing plate 21 can extend the air flow time in the ventilation slot 19, and when the air contacts the guide shell 22 during the flow, the air can be guided to the upper and lower sides through the guide shell 22 (the module holding rack 5 is in an inclined state at this time), so that the air is discharged from the upper and lower sides. For this reason, when the wind is small, the heat generated by the photovoltaic module is exchanged by extending the air circulation time in the ventilation slot 19 to achieve the heat dissipation function. When the wind is strong (the wind will drive the wind shield 24 to swing), the wind shield 24 swings and drives the guide rod 28 to move through the second pull rope 25, and the guide rod 28 moves with the V-shaped groove 27 cooperates to move the guide shell 22 upward to open the ventilation slot 19, and in this process, the second pull rope 25 will drive the swing plate 21 to swing in the opposite direction of the air flow (the swing plate 21 is in a horizontal state after swinging, and the swing plate 21 no longer blocks the ventilation area of ​​the ventilation slot 19). After the swing plate 21 swings, the space in the ventilation slot 19 is opened, so that the flow rate of air in the ventilation slot 19 is increased, and because the cross-sectional width of the ventilation slot 19 gradually decreases toward the middle thereof, the air in the ventilation slot 19 can be accelerated when passing through the position with a smaller cross-section. If the air flows too fast, the pressure in the ventilation slot 19 will be reduced and a negative pressure will be gradually formed. When a negative pressure is formed in the ventilation slot 19, the air between the module holding rack 5 and the photovoltaic module can be drawn downward, and the heat generated by the photovoltaic module can be driven downward and discharged. Therefore, when the wind force is strong, the heat dissipation efficiency of the photovoltaic module can be accelerated by changing the air flow rate.

[0032] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A supporting structure for a photovoltaic module, comprising a mounting frame (1), a universal wheel (2) being mounted at the bottom of the mounting frame (1), an electric turntable (3) being arranged in the middle of the mounting frame (1), a photosensitive sensor (4) being arranged on the side wall of the mounting frame (1), a module receiving frame (5) being rotatably connected to one side of the upper portion of the mounting frame (1), symmetrically distributed electric push rods (6) being rotatably connected to the mounting frame (1), the telescopic ends of the electric push rods (6) being hinged to the bottom of the module receiving frame (5), and a control module (7) being arranged on the mounting frame (1) and being connected to a remote control terminal via the Internet of Things, wherein: The upper side surface of the module holding frame (5) is provided with sliding grooves (8) which are circumferentially equidistantly distributed, and the module holding frame (5) is provided with a fixing component for positioning the photovoltaic module, the module holding frame (5) is provided with a slot (18), the module holding frame (5) is provided with a ventilation slot (19) which is connected to the slot (18), the module holding frame (5) is provided with through holes (20) which are equidistantly distributed, the through holes (20) are connected to the ventilation slots (19), and the ventilation slots (19) are provided with an adjustment component for changing the air flow rate, and the electric turntable (3), the photosensor (4) and the fixing component are all electrically connected to the control module (7).

2. A photovoltaic module support structure according to claim 1, characterized in that: The fixing assembly comprises an electromagnetic component (9) fixedly connected to the slide groove (8), the electromagnetic component (9) being electrically connected to the control module (7), a sliding block (10) being slidably connected to the slide groove (8), a magnetic component (11) cooperating with the electromagnetic component (9) being fixedly connected to a side wall of the sliding block (10), a mounting plate (12) being fixedly connected to the top of the sliding block (10), a positioning plate (13) being fixedly connected to the top of the mounting plate (12), a pressure trigger electrically connected to the control module (7) being embedded on the positioning plate (13), a support bar (17) being fixedly connected to the upper side surface of the module holding frame (5) at equidistant intervals in the circumferential direction, and the support bar (17) being made of rubber, a pressure sensor electrically connected to the control module (7) being provided on the inner side of the support bar (17), and a power component for driving the sliding block (10) to move being installed at the bottom of the module holding frame (5).

3. A photovoltaic module support structure according to claim 2, characterized in that: The upper side surface of the support bar (17) is at the same height as the upper side surface of the mounting plate (12), so as to facilitate the fixing of the corners of the photovoltaic module by the locking plate (13).

4. A photovoltaic module support structure according to claim 2, characterized in that: The power component comprises a reduction motor (14) fixedly connected to the bottom of the module holding frame (5) through a connecting frame, the reduction motor (14) is electrically connected to the control module (7), the output shaft of the reduction motor (14) is equipped with a winding wheel (15), and the other side wall of the sliding block (10) is fixedly connected to a first pull rope (16), and the first pull rope (16) passes through the module holding frame (5) and is fixedly connected to the winding wheel (15).

5. The supporting structure of a photovoltaic module according to claim 1, characterized in that: The adjustment assembly comprises two groups of symmetrically arranged swing plates (21), the two groups of swing plates (21) being arranged in the ventilation slot (19), a guide shell (22) being arranged in the middle of the ventilation slot (19), the guide shell (22) being located between the two groups of swing plates (21), guide wheels (23) being installed on both side walls of the module holding rack (5), wind shield plates (24) being rotatably connected to both sides of the bottom of the module holding rack (5) via shafts, the wind shield plates (24) being arranged to move in a direction of rotation. ) is sleeved with a torsion spring on its shaft, the two ends of the torsion spring are respectively fixedly connected to the wind shield (24) and the module holding frame (5), a second pull rope (25) is connected between the two wind shields (24), a strip groove for vertically slidingly cooperating with the second pull rope (25) is opened on the guide shell (22), the second pull rope (25) passes around the corresponding guide wheel (23) and is connected to the swing plate (21), and a pushing member is fixedly connected between the guide shell (22) and the second pull rope (25).

6. A photovoltaic module support structure according to claim 5, characterized in that: The side of the guide shell (22) facing the swing plate (21) is arranged as an arc-shaped surface to facilitate air guidance.

7. The supporting structure of a photovoltaic module according to claim 5, characterized in that: The length of each group of the swing plates (21) gradually decreases towards the middle of the module holding frame (5); the swing plates (21) are provided with vents, and the vents on adjacent swing plates (21) are staggered to extend the air flow time; the swing plates (21) and the through holes (20) are staggered to extend the air flow time.

8. The supporting structure of a photovoltaic module according to claim 1, characterized in that: The cross-sectional width of the ventilation slot (19) gradually decreases towards the middle thereof, so as to accelerate air circulation and form negative pressure to generate suction.

9. The supporting structure of a photovoltaic module according to claim 5, characterized in that: The connection point between the second pull rope (25) and the swing plate (21) is located on the upper side of the swing plate (21), so as to facilitate pulling the swing plate (21) to swing and expand the ventilation area of ​​the ventilation slot (19).

10. A photovoltaic module support structure according to claim 5, characterized in that: The pushing member comprises a fixing plate (26) symmetrically fixed to the top of the guide shell (22), V-shaped grooves (27) are provided on opposite sides of the symmetrically distributed fixing plates (26), a guide rod (28) is slidably provided between the symmetrically distributed V-shaped grooves (27), and the guide rod (28) is fixedly connected to the second pull rope (25).