Tracking type photovoltaic support applied to roof

Abstract

The invention discloses a tracking type photovoltaic support applied to a roof, and belongs to the technical field of photovoltaic supports, the tracking type photovoltaic support comprises a main shaft used for bearing a photovoltaic module, the main shaft is fixed in the middle of the lower portion of the photovoltaic module and arranged in the length direction of the photovoltaic module, and the main shaft is arranged on a supporting structure; a balancing weight connected with the supporting structure is arranged below the photovoltaic module; an angle adjusting device is arranged on the supporting structure and is used for driving the main shaft to adjust the inclination angle of the photovoltaic module; when the inclination angle of the photovoltaic module is 0 degree, the photovoltaic module is used as a strong wind protection angle, the wind load of the photovoltaic module is small, and the phenomenon of large-amplitude wind vibration is not easy to generate. The balancing weight is used as a foundation of the supporting structure, and the roof structure cannot be damaged; the angle adjusting device drives the main shaft and the photovoltaic module to overturn and track by taking the front and rear edge positions of the photovoltaic module as the rotation center, thereby effectively reducing the height of the photovoltaic support, saving the steel consumption, and reducing the self load. The device is simple and light in structure and suitable for large-area installation on roofs.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic brackets, and in particular relates to a tracking photovoltaic bracket applied to a roof. Background Art

[0002] As we all know, photovoltaic mounts can be divided into fixed photovoltaic mounts and tracking photovoltaic mounts according to whether the inclination angle is adjustable. Tracking photovoltaic mounts adjust the inclination angle of photovoltaic modules to reduce the angle between the modules and direct sunlight, so that the photovoltaic modules can capture more solar radiation energy, greatly improving the power generation efficiency of photovoltaic modules. Tracking photovoltaic mounts have been widely used in some low-latitude and high-altitude areas with relatively rich solar energy resources.

[0003] At present, with the continuous advancement of urbanization, the number of buildings is increasing. Rooftops have become one of the important scenes for photovoltaic development because of good sunshine and no interference with people's production and life. However, due to the weak bearing capacity of building roofs, the weight of photovoltaic brackets cannot be too large. Traditional large tracking photovoltaic brackets cannot be used on roofs due to their heavy weight. Therefore, it is urgent to develop a lightweight tracking photovoltaic bracket that can be used on roofs. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a tracking photovoltaic bracket applied to a roof.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A tracking photovoltaic bracket used for roofs, comprising a main shaft for supporting a photovoltaic module, wherein the main shaft is fixed to the lower middle part of the photovoltaic module and arranged along the length direction of the photovoltaic module, the main shaft is arranged on a supporting structure, and a counterweight block connected to the supporting structure is provided below the photovoltaic module; an angle adjustment device connected to the main shaft is provided on the supporting structure, and the angle adjustment device drives the main shaft and the photovoltaic module to flip and track with the edge position of the photovoltaic module as the rotation center, so as to achieve the purpose of adjusting the inclination angle of the photovoltaic module; when the photovoltaic module is in a horizontal state, that is, the inclination angle is 0°, which serves as a strong wind protection angle.

[0006] Furthermore, the photovoltaic assembly includes a plurality of photovoltaic panel units arranged in parallel rows, purlins are provided on both side edges of the photovoltaic panel units, and the main axis is connected to the bottom of the purlins and is arranged perpendicular to the purlins.

[0007] Furthermore, the supporting structure includes a main supporting platform and multiple supporting frames for supporting the angle adjustment device. The main supporting platform is arranged in the middle of the photovoltaic component, and the multiple supporting frames are arranged at intervals on both sides of the main supporting platform and in the gaps and ends of the photovoltaic components on both sides; the counterweight block is arranged at the bottom of all the supporting frames.

[0008] Furthermore, the angle adjustment device includes a translation and lifting mechanism and multiple groups of sliding mechanisms, the main shaft is composed of multiple shaft segments, the translation and lifting mechanism is connected to the sliding mechanism and two adjacent sliding mechanisms through different shaft segments respectively, the translation and lifting mechanism is arranged on the top of the main support platform and in the middle gap of the photovoltaic component, the translation and lifting mechanism can drive the end of the shaft segment to perform a translation movement and an up and down lifting movement perpendicular to the length direction of the photovoltaic component; the sliding mechanism is arranged on the support frame on both sides of the translation and lifting mechanism, the sliding mechanism is connected to the translation and lifting mechanism, and guide rails for supporting and moving the purlins are provided under the shaft segments between the translation and lifting mechanism and the sliding mechanism and between two adjacent sliding mechanisms.

[0009] Furthermore, the translation and lifting mechanism includes a motor, a lead screw, a slide rail and a first slider, the lead screw is coaxially fixed with the output shaft of the motor, and the lead screw and the slide rail are both arranged on a support seat; slide rails are symmetrically arranged on both sides of the lead screw, the first slider is threadedly matched with the lead screw, and a light hole matched with the slide rail is provided on the first slider; vertical slide rails for lifting and lowering the end of the shaft section are symmetrically arranged on both sides of the first slider.

[0010] Furthermore, the sliding mechanism includes a crossbeam and a second slider, the two ends of the crossbeam are respectively arranged on the top of the columns at both ends of the support frame and are hingedly connected thereto, the middle part of the crossbeam is provided with a horizontal slide groove for the movement of the second slider, and the second slider passes through the horizontal slide groove; the side of the second slider is provided with a vertical slide rail for the lifting and lowering of the end of the shaft section; the second slider at the end of the photovoltaic module is only provided with a vertical slide rail on the inner side, and the other second sliders are provided with vertical slide rails on both sides.

[0011] Furthermore, the guide rail is arranged on a long strip base, and the guide rail is arranged parallel to the purlin. Both ends of the guide rail are provided with upward and opposite folded edges. Both ends of the purlin above the guide rail are provided with a first pulley that can move along the guide rail, and the root of the folded edge is provided with an arc groove for limiting the first pulley.

[0012] Furthermore, an upward bend is provided at the end of the shaft section, and a second pulley is provided at the end of the bend, and the second pulley can move along the vertical slide rail.

[0013] Furthermore, the photovoltaic components are arranged in multiple rows in parallel, and the lead screws of the translation and lifting mechanisms in the middle of two adjacent rows of photovoltaic components are correspondingly connected.

[0014] Furthermore, the main shaft is connected to the bottom of the purlin through a U-shaped clamp, and the U-shaped clamp is fixed to the main shaft through a purlin pressure plate.

[0015] Compared with the prior art, the present invention has the following technical advances: The present invention uses a counterweight as the basis of the supporting structure, which will not damage the roof structure; the angle of the photovoltaic module is adjusted by driving the main shaft through the angle adjustment device, and the front and rear edge positions of the photovoltaic module are used as the rotation center for flip tracking. There is no need to worry about the photovoltaic module contacting the ground during the tracking process, which can effectively reduce the height of the photovoltaic bracket, save steel usage, and reduce the size of its own gravity load; when the inclination angle of the photovoltaic module is 0°, as the strong wind protection angle of the photovoltaic module, the wind load is small and it is not easy to produce a large wind vibration phenomenon. The present invention has a simple and light structure, is convenient and fast to manufacture and transport, and is suitable for large-area installation on the roof. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] In the attached picture: Figure 1 A schematic diagram of the structure of a tracking photovoltaic support applied to a roof provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of the translation lifting mechanism in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the sliding mechanism in an embodiment of the present invention; Figure 4 Schematic diagram of the coordination between the purlin and the guide rail in an embodiment of the present invention; Figure 5 Schematic diagram of the connection between the purlin and the main shaft in an embodiment of the present invention; Figure 6 A schematic diagram of the arrangement of multiple rows of photovoltaic modules in another embodiment of the present invention; In the figure: 1-motor; 2-translation and lifting mechanism; 3-sliding mechanism; 4-second pulley; 5-guide rail, 50-folding edge, 51-arc groove; 6-counterweight block; 7-purlin; 8-column; 9-crossbeam; 10-photovoltaic module, 101-photovoltaic panel unit; 11-first pulley; 12-first slider; 13-slide rail; 14-screw; 15-vertical slide rail; 16-main shaft, 160-shaft section, 161-bend; 17-second slider; 18-purlin pressure plate; 19-U-shaped clamp; 20-main support platform; 21-support frame; 22-support seat; 23-horizontal slide groove; 24-base; 25-universal joint. DETAILED DESCRIPTION

[0018] The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a tracking photovoltaic bracket applied to a roof includes a main shaft 16 for supporting a photovoltaic assembly 10, the main shaft 16 is fixed to the lower middle part of the photovoltaic assembly 10 and arranged along the length direction of the photovoltaic assembly 10, the main shaft 16 is arranged on a supporting structure, and a counterweight block 6 connected to the supporting structure is arranged below the photovoltaic assembly 10; the supporting structure is provided with an angle adjustment device connected to the main shaft 16, and the angle adjustment device drives the main shaft 16 and the photovoltaic assembly 10 to flip and track with the edge position of the photovoltaic assembly 10 as the rotation center, so as to achieve the purpose of adjusting the inclination of the photovoltaic assembly 10; when the inclination of the photovoltaic assembly 10 is 0°, as a strong wind protection angle, the photovoltaic assembly is in a horizontal state at this time, and it is not easy to produce a large-scale wind vibration phenomenon, and it is more solid under the action of wind load. Compared with the traditional flat single-axis photovoltaic bracket that flips and tracks with the middle main shaft of the photovoltaic assembly as the rotation axis, the present invention flips and tracks with the front and rear edge positions of the photovoltaic assembly as the rotation center, and there is no need to worry about the photovoltaic assembly contacting the ground during the tracking process, which can effectively reduce the height of the photovoltaic bracket, save steel usage, and reduce the size of its own gravity load.

[0020] The specific layout of photovoltaic modules is as follows: Figure 1 As shown in Figure 6, the photovoltaic module 10 includes a plurality of photovoltaic panel units 101 arranged in parallel rows, and purlins 7 are provided on both side edges of the photovoltaic panel units 101. The main shaft 16 is connected to the bottom of the purlin 7 and is arranged perpendicular to the purlin 7. The main shaft 16 is connected to the bottom of the purlin 7 through a U-shaped clamp 19, and the U-shaped clamp 19 is fixed to the main shaft 16 through a purlin pressing plate 18. The purlin 7 is fixed to the main shaft by using the U-shaped clamp 19 and the purlin pressing plate 18, which can prevent the photovoltaic module 10 from being bent and deformed under the action of wind load.

[0021] As a preferred structure, Figure 1 , 2 As shown, the support structure includes a main support platform 20 and a plurality of support frames 21 for supporting the angle adjustment device. The main support platform 20 is arranged in the middle of the photovoltaic module 10, and the plurality of support frames 21 are arranged at intervals on both sides of the main support platform 20 and at the gaps and ends of the photovoltaic modules 10 on both sides; the counterweight 6 is arranged at the bottom of all the support frames 21. Among them, the counterweight is cast with concrete. As the foundation of the photovoltaic module, it will not damage the roof structure and waterproofing, and is easy to make and transport. For some non-walkable roofs with weak roof bearing capacity, anchor bolts can be used instead of the counterweight foundation.

[0022] In a specific embodiment of the present invention, Figure 1-3As shown, the angle adjustment device includes a translation and lifting mechanism 2 and multiple groups of sliding mechanisms 3, the main shaft 6 is composed of multiple shaft segments 160, the translation and lifting mechanism 2 is connected to the sliding mechanism 3 and two adjacent sliding mechanisms 3 through different shaft segments 160, the translation and lifting mechanism 2 is arranged on the top of the main support platform 20 and in the middle gap of the photovoltaic component 10, the translation and lifting mechanism 2 can drive the end of the shaft segment 160 to perform a translation action and an up and down lifting action perpendicular to the length direction of the photovoltaic component 10; the sliding mechanism 3 is arranged on the support frame 21 on both sides of the translation and lifting mechanism 2, the sliding mechanism 3 is connected to the translation and lifting mechanism 2, and the shaft segments 160 between the translation and lifting mechanism 2 and the sliding mechanism 3 and between two adjacent sliding mechanisms 3 are provided with guide rails 5 for supporting and moving the purlin 7. The guide rail 5 is arranged on the long strip base 24, and the guide rail 5 is arranged parallel to the purlin 7. Both ends of the guide rail 5 are provided with upward and opposite folding edges 50. Both ends of the purlin 7 above the guide rail 5 are provided with a first pulley 11 that can move along the guide rail 5, and the root of the folding edge 50 is provided with an arc groove 51 for limiting the first pulley 11. The main shaft 16 is driven to perform translation and up and down lifting actions at the same time through the translation lifting mechanism 2 and the multiple sets of sliding mechanisms 3, and the coupling enables the photovoltaic assembly 10 to flip with the first pulley 11 under the purlin 7 as the fulcrum. The photovoltaic bracket can realize flipping in both positive and negative directions, and can realize tracking of the solar azimuth angle throughout the day.

[0023] When designing specifically, Figure 2 As shown, the translation and lifting mechanism 2 includes a motor 1, a lead screw 14, a slide rail 13 and a first slider 12. The lead screw 14 is coaxially fixed with the output shaft of the motor 1. The lead screw 14 and the slide rail 13 are both arranged on a support seat 22. The slide rails 13 are symmetrically arranged on both sides of the lead screw 14. The first slider 12 is threadedly matched with the lead screw 14. The first slider 12 is provided with a light hole matched with the slide rail 13. The slide rail 13 is used to limit the first slider 12. The first slider 12 is symmetrically provided with vertical slide rails 15 on both sides for the end of the shaft section 160 to be lifted and lowered. Since the first slider 12 can be stopped and locked at any position on the lead screw 14, it is ensured that the overall structure has sufficient constraints in all degrees of freedom. The first slider 12 is locked at a certain position so that the photovoltaic bracket can be fixed at a certain inclination angle. The specific working process is as follows: The motor 1 drives the lead screw 14 to rotate, driving the first slider 12 to move horizontally along the slide rail 13, and the photovoltaic module 10 and the main shaft 16 move in this direction with the first slider 12; the first pulleys 11 on both sides of the purlin 7 under the photovoltaic module 10 move along the guide rail 5; when the first pulley 11 moves into the arc groove 51 on both sides of the horizontal guide rail, the first pulley 11 cannot continue to move forward, and the motor 1 continues to drive the lead screw 14 and the first slider 12 to move. During the translation process, the first slider 12 drives the end of the shaft section 160 to rise and fall along the vertical slide rail 15, and the first slider 12 moves in both horizontal and vertical directions at the same time. The coupling of the two directions of movement enables the photovoltaic module 10 to flip with the first pulley 11 under the purlin 7 as the fulcrum; thereby realizing the adjustment of the inclination angle of the photovoltaic module.

[0024] When encountering strong winds, the photovoltaic modules can be flipped to a tilt angle of 0° so that they are horizontal. Figure 3 , 4 As shown. At this time, both ends of the purlin 7 slide into the arc groove 51, and the arc grooves 51 at both ends play a limiting role on the two ends of the purlin 7, making the overall structure more solid, and the ability to resist wind loads is greatly improved, which can effectively avoid the generation of large torsional vibrations, and has stronger wind resistance. Compared with the traditional flat single-axis photovoltaic bracket, the present invention increases the constraint of the guide rail on the photovoltaic assembly, and the overall structure is more solid, and the ability to resist wind loads is greatly improved, which can effectively avoid the generation of large torsional vibrations, and has stronger wind resistance. It also reduces the bearing pressure of the main shaft and effectively reduces the cross-sectional area of ​​the main shaft. In addition, this tracking photovoltaic bracket has multiple constraints, which can evenly transfer the force on the photovoltaic bracket to the roof, effectively preventing the roof structure from being damaged due to excessive force in some places.

[0025] In a specific embodiment of the present invention, Figure 3 As shown, the sliding mechanism 3 includes a crossbeam 9 and a second slider 17. The two ends of the crossbeam 9 are respectively arranged on the top of the columns 8 at the two ends of the support frame 21 and are hingedly connected thereto. The middle part of the crossbeam 9 is provided with a horizontal slide groove 23 for the second slider 17 to move, and the second slider 17 is arranged through the horizontal slide groove 23; the side of the second slider 17 is provided with a vertical slide rail 15 for the end of the shaft segment 160 to rise and fall; the second slider 17 at the end of the photovoltaic component 10 is only provided with a vertical slide rail 15 on the inner side, and the other two sides of the second slider 17 are provided with vertical slide rails 15. The multi-section shaft segments 160 of the main shaft 16 can realize synchronous movement under the drive of the motor through the above-mentioned sliding mechanism 3, that is, the rotation of the photovoltaic components 10 in the same span can be transmitted to the adjacent span through the above-mentioned sliding mechanism 3, and the photovoltaic components 10 in the adjacent spans can realize synchronous movement to ensure that the photovoltaic components 10 can be turned over smoothly. In addition, the number of photovoltaic components and the number of shaft segments 160 are determined according to the output power of the motor, and are not limited to Figure 1 , 6The number in .

[0026] During specific assembly, the two ends of the beam 9 are connected to the top of the column 8 through the universal joint 25 to ensure that the beam 9 is free to twist. The column 8 is used to constrain the photovoltaic module in the vertical direction. The span of the photovoltaic module 10 needs to be obtained through mechanical calculation. This is a prior art and will not be repeated here. The use of the sliding mechanism 3 and the support frame 21 below it can ensure that the photovoltaic bracket has a certain vertical stiffness and horizontal stiffness.

[0027] When the photovoltaic assembly 10 is tilted at other inclination angles, the movement of the translation and lifting mechanism 2 drives the photovoltaic assembly 10 to move, and the first pulley 11 at one end of the purlin 7 is separated from the guide rail 5, and the photovoltaic assembly 10 is turned over with the first pulley 11 on the other side as the fulcrum. The first slider 12 is locked on the lead screw 14 to provide torsional, horizontal and vertical stiffness for the photovoltaic bracket. The crossbeam 9 and the column 8 of the sliding mechanism 3 exert vertical constraints on the photovoltaic bracket, and the front edge of the guide rail 5 exerts vertical constraints on the photovoltaic bracket. At this time, the sliding mechanism 3 and the translation and lifting mechanism 2 only have horizontal stiffness on the bracket, and the vertical stiffness is zero. The vertical constraint is only provided by the folded edge 50 at the end of the guide rail 5.

[0028] Further optimize the above structure, such as Figure 2 As shown, the end of the shaft section 160 is provided with an upward bend 161, and the end of the bend 161 is provided with a second pulley 4, which can move along the vertical slide rail 15. The second pulley 4 can reduce the resistance of the end bend 161 of the shaft section 160 during the movement along the vertical slide rail 15, thereby reducing energy consumption.

[0029] In another specific embodiment of the present invention, Figure 6 As shown, the photovoltaic modules 10 are arranged in multiple rows in parallel, and the lead screws 14 of the translation and lifting mechanisms in the middle of two adjacent rows of photovoltaic modules 10 are connected correspondingly, and the two rows of photovoltaic modules share a motor 1. The lead screw 14 in the middle of the two rows of photovoltaic modules is shared, and the motor 1 is at one end of the lead screw, which can drive the two rows of photovoltaic modules 10 to rotate simultaneously; the specific number of photovoltaic modules depends on the motor power. By reducing the amount of motors used, important economic expenses can be saved. In addition, in order to accurately track the sun's position, the motor can also be installed with a corresponding sensor, which can sensitively sense the intensity of light energy.

[0030] The specific application process of the present invention is as follows: A photosensitive sensor is installed on the motor to control the driving of the motor through light sensing, so that the photovoltaic bracket can track the sun's position. The motor 1 drives the lead screw 14 to rotate, and the lead screw 14 drives the first slider 12 to move. When the motor 1 stops working, the first slider 12 can be locked on the lead screw 14.

[0031] The first slider 12 drives the shaft sections 160 on both sides, the purlin 7 and the photovoltaic module 10 to move during the movement. When the first pulley 11 at the bottom of the purlin 7 enters the bottom of the arc groove 51 at the end of the guide rail 5, the shaft section 160 no longer translates, and the motor 1 continues to drive the first slider 12 to move. The bends 161 at both ends of the shaft section 160 move upward along the vertical slide rails 15 on the sides of the first slider 12 and the second slider 17, respectively, to achieve the purpose of adjusting the inclination angle of the photovoltaic module 10.

[0032] When encountering strong winds, the motor 1 drives the photovoltaic module 10 to rotate to a horizontal state, that is, the inclination angle is 0°. At the same time, the two ends of the purlin 7 enter the arc groove 51 below the folded edges 50 at both ends of the guide rail 5, which is not easy to produce large-scale wind vibration. Compared with the unilateral constraint of the bottom guide rail of photovoltaic modules with other inclination angles, the two sides of the bottom guide rail of the photovoltaic module at an inclination angle of 0° have a constraint effect on it. At an inclination angle of 0°, the photovoltaic module is more secure under the action of wind load.

[0033] In summary, the present invention has the following advantages: 1. The tracking photovoltaic bracket provided by the present invention uses the front and rear edge positions of the component as the rotation center for flipping and tracking. Compared with the traditional flat single-axis photovoltaic bracket that uses the central main axis position of the component as the rotation axis for flipping and tracking, the tracking method adopted by the present invention does not need to worry about the photovoltaic component contacting the ground during the tracking process, which can effectively reduce the overall height of the photovoltaic bracket, save steel usage, and reduce the size of its own gravity load.

[0034] 2. Compared with the traditional flat single-axis photovoltaic bracket, the tracking photovoltaic bracket provided by the present invention adds the constraint of the bottom guide rail of the photovoltaic module, and the structure is more solid. The ability to resist wind load is greatly improved, which can effectively avoid the generation of large torsional vibrations and has stronger wind resistance. At the same time, it also reduces the bearing pressure of the main shaft and effectively reduces the cross-sectional area of ​​the main shaft.

[0035] 3. In addition, the tracking photovoltaic support provided by the present invention has multiple constraints, which can evenly transfer the force on the photovoltaic support to the roof, effectively preventing the roof structure from being damaged due to excessive force in some places.

[0036] 4. The rows of roof-mounted tracking photovoltaic brackets provided by the present invention can be synchronously tracked by the method mentioned above, thereby reducing the use of motors and saving important economic expenses.

[0037] 5. The roof-tracking photovoltaic bracket provided by the present invention has a low height, and the roof parapet can help the photovoltaic bracket to block strong winds, which can effectively reduce the size of its surface wind load.

[0038] 6. The tracking photovoltaic bracket provided by the present invention can adopt a 0-degree inclination angle as a strong wind protection angle. The wind load at a 0-degree inclination angle is relatively small, and it is not easy to produce large-scale wind vibration. Compared with the unilateral constraint of the bottom guide rail of photovoltaic modules with other inclination angles, the bottom guide rail of photovoltaic modules with a 0-degree inclination angle has constraints on both sides of it, and the 0-degree inclination angle is more solid under the action of wind load.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A tracking photovoltaic bracket applied to a roof, characterized by: It includes a main shaft for supporting the photovoltaic module, which is fixed at the lower middle part of the photovoltaic module and arranged along the length direction of the photovoltaic module. The main shaft is arranged on the supporting structure, and a counterweight block connected to the supporting structure is provided below the photovoltaic module; an angle adjustment device connected to the main shaft is provided on the supporting structure, and the angle adjustment device drives the main shaft and the photovoltaic module to flip and track with the edge position of the photovoltaic module as the rotation center, so as to achieve the purpose of adjusting the inclination angle of the photovoltaic module; when the photovoltaic module is in a horizontal state, that is, the inclination angle is 0°, which serves as a strong wind protection angle.

2. A tracking photovoltaic bracket applied to a roof according to claim 1, characterized in that: The photovoltaic assembly comprises a plurality of photovoltaic panel units arranged in parallel rows. Purlins are arranged on both side edges of the photovoltaic panel units. The main axis is connected to the bottom of the purlins and is arranged perpendicular to the purlins.

3. A tracking photovoltaic bracket applied to a roof according to claim 2, characterized in that: The support structure includes a main support platform and multiple support frames for supporting the angle adjustment device. The main support platform is arranged in the middle of the photovoltaic component, and the multiple support frames are arranged at intervals on both sides of the main support platform and in the gaps and ends of the photovoltaic components on both sides; the counterweight block is arranged at the bottom of all the support frames.

4. A tracking photovoltaic bracket applied to a roof according to claim 3, characterized in that: The angle adjustment device includes a translation and lifting mechanism and multiple groups of sliding mechanisms. The main shaft is composed of multiple shaft segments. The translation and lifting mechanism is connected to the sliding mechanism and two adjacent sliding mechanisms through different shaft segments respectively. The translation and lifting mechanism is arranged on the top of the main support platform and in the middle gap of the photovoltaic module. The translation and lifting mechanism can drive the end of the shaft segment to perform a translation movement and an up and down lifting movement perpendicular to the length direction of the photovoltaic module; the sliding mechanism is arranged on the support frames on both sides of the translation and lifting mechanism, and the sliding mechanism is connected to the translation and lifting mechanism. Guide rails for supporting and moving the purlins are provided under the shaft segments between the translation and lifting mechanism and the sliding mechanism and between two adjacent sliding mechanisms.

5. A tracking photovoltaic support for rooftop use according to claim 4, characterized in that: The translation and lifting mechanism includes a motor, a lead screw, a slide rail and a first slider. The lead screw is coaxially fixed with the output shaft of the motor. The lead screw and the slide rail are both arranged on a support seat. The slide rails are symmetrically arranged on both sides of the lead screw. The first slider is threadedly matched with the lead screw. The first slider is provided with a light hole matched with the slide rail. Vertical slide rails for lifting and lowering the end of the shaft section are symmetrically arranged on both sides of the first slider.

6. A tracking photovoltaic support for rooftop use according to claim 5, characterized in that: The sliding mechanism includes a crossbeam and a second slider, the two ends of the crossbeam are respectively arranged on the top of the columns at both ends of the support frame and are hingedly connected thereto, the middle part of the crossbeam is provided with a horizontal slide groove for the second slider to move, and the second slider passes through the horizontal slide groove; the side of the second slider is provided with a vertical slide rail for the lifting and lowering of the end of the shaft section; the second slider at the end of the photovoltaic module is only provided with a vertical slide rail on the inner side, and the other second sliders are provided with vertical slide rails on both sides.

7. A tracking photovoltaic support for rooftop use according to claim 4, characterized in that: The guide rail is arranged on a long strip base, and the guide rail is arranged parallel to the purlin. Both ends of the guide rail are provided with upward and opposite folded edges. Both ends of the purlin above the guide rail are provided with a first pulley that can move along the guide rail, and the root of the folded edge is provided with an arc groove for limiting the first pulley.

8. The tracking photovoltaic support applied to a roof according to claim 6, characterized in that: An upward bend is provided at the end of the shaft section, and a second pulley is provided at the end of the bend. The second pulley can move along the vertical slide rail.

9. The tracking photovoltaic support applied to a roof according to claim 5, characterized in that: The photovoltaic components are arranged in multiple rows in parallel, and the lead screws of the translation and lifting mechanisms in the middle of two adjacent rows of photovoltaic components are connected correspondingly.

10. A tracking photovoltaic support applied to a roof according to any one of claims 2 to 9, characterized in that: The main shaft is connected to the bottom of the purlin through a U-shaped clamp, and the U-shaped clamp is fixed on the main shaft through a purlin pressing plate.

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