Photovoltaic expansion device

Abstract

The utility model discloses a photovoltaic expansion device, including a frame, wherein the frame is provided with a first unfolding mechanism, a second unfolding mechanism and a third unfolding mechanism in sequence from top to bottom, the second translation mechanism and the third translation mechanism are respectively arranged on both sides of the frame, the second unfolding mechanism is accommodated below the first unfolding mechanism or unfolded outwardly to be flush with the first unfolding mechanism through the cooperation of the second translation mechanism and the second lifting mechanism, and the third unfolding mechanism is accommodated below the first unfolding mechanism or unfolded outwardly to be flush with the first unfolding mechanism through the cooperation of the third translation mechanism and the third lifting mechanism. Compared with the prior art, when the utility model is unfolded, the first unfolding mechanism, the second unfolding mechanism and the third unfolding mechanism are arranged flush, thereby preventing the occurrence of hot spot phenomenon. Secondly, the translation mechanism and the lifting mechanism are arranged outside the unfolding mechanism, which will not hinder the three unfolding mechanisms from continuing to unfold themselves, thereby being able to obtain more photovoltaic unfolding area.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic expansion device. Background Art

[0002] Photovoltaic power generation is a technology that uses the semiconductor photovoltaic effect to directly convert light energy into electrical energy. Photovoltaic power generation is clean and pollution-free and is widely used in many occasions. In the prior art, photovoltaic panels are fixedly installed, such as fixedly installed on roofs, car tops, boat tops, etc., and converted into electrical energy through sunlight. The patent with publication number CN220964712U discloses a photovoltaic panel telescopic structure; including a main frame, at least one transverse telescopic frame, at least one longitudinal telescopic frame and a plurality of photovoltaic panels; the main frame and the transverse telescopic frame are both equipped with pull-out guide rails, the transverse telescopic frame can be installed on the main frame by the pull-out guide rail, and the longitudinal telescopic frame can be installed on the transverse telescopic frame by the pull-out guide rail; the photovoltaic panel is installed on the top of the main frame, the transverse telescopic frame and the longitudinal telescopic frame. It realizes the expansion of the transverse telescopic frame relative to the main frame, and the expansion of the longitudinal telescopic frame relative to the transverse telescopic frame, thereby increasing the area of ​​the photovoltaic panel exposed to the sun. However, after expansion, the photovoltaic panels are distributed in steps both in the transverse and longitudinal directions. After unfolding, the photovoltaic panels are adjacent to each other, and sometimes a photovoltaic panel will be blocked by the shadow of other photovoltaic panels, resulting in the occurrence of hot spot effect. Utility Model Content

[0003] The utility model provides a photovoltaic expansion device, which is used to solve the problem in the prior art that the photovoltaic panels are distributed in a step-like manner after being expanded, resulting in a hot spot effect.

[0004] The utility model provides a photovoltaic expansion device, including a frame, wherein the frame is provided with a first unfolding mechanism, a second unfolding mechanism and a third unfolding mechanism in sequence from top to bottom, the second unfolding mechanism and the third unfolding mechanism are respectively connected to a second lifting mechanism and a third lifting mechanism, a second translation mechanism is provided between the second unfolding mechanism and the frame, a third translation mechanism is provided between the third unfolding mechanism and the frame, the second translation mechanism and the third translation mechanism are respectively arranged on both sides of the frame, the second translation mechanism comprises: a second vertical guide rail, a second support rod, a second slider, a second power rod and a second drawer-type slide rail, the second drawer-type slide rail is respectively connected to the second lifting mechanism and the second unfolding mechanism The second unfolding mechanism is fixed, the second slider is fixed to the lower end of the second support rod, the upper end of the second support rod is slidably connected to the second unfolding mechanism, the second slider slides up and down along the second vertical guide rail, one end of the second power rod is hinged to the second slider, and the other end is hinged to the outer side of the second unfolding mechanism, the structure of the third translation mechanism is the same as that of the second translation mechanism; the second unfolding mechanism is accommodated below the first unfolding mechanism or unfolded outwardly and flush with the first unfolding mechanism through the cooperation of the second translation mechanism and the second lifting mechanism, and the third unfolding mechanism is accommodated below the first unfolding mechanism or unfolded outwardly and flush with the first unfolding mechanism through the cooperation of the third translation mechanism and the third lifting mechanism.

[0005] Preferably, the second lifting mechanism includes a second support plate, the second support plate is fixed to the second drawer-type slide rail, a second lead screw is threadedly connected to the second support plate, the second lead screw is rotatably connected to the frame, the second lead screw is connected to a second drive motor, and a second guide rod is slidably arranged on the second support plate.

[0006] Preferably, there are two second lead screws, the two second lead screws are connected by a chain transmission mechanism, and the second drive motor drives one second lead screw to rotate, thereby driving the other second lead screw to rotate.

[0007] Preferably, the second drawer-type slide rail is located below the second unfolding mechanism, and the second drawer-type slide rail is fixed to the second unfolding mechanism via a second connecting plate.

[0008] Preferably, it further comprises a second sliding rod slidably arranged on the upper end of the second support rod, and both ends of the second sliding rod are fixed to the second unfolding mechanism.

[0009] Preferably, a connecting beam is fixed between the two second supporting plates, and the connecting beam is fixed to the second supporting rod via a connecting piece.

[0010] Preferably, there are two of each of the second vertical guide rail, the second support rod, the second slider and the second power rod, the two second support rods are fixed by a second cross beam, and the two ends of the second cross beam are respectively fixed to the two second sliders.

[0011] Preferably, the first unfolding mechanism includes: a bracket, a telescopic assembly and three groups of photovoltaic panel assemblies, the first group of photovoltaic panel assemblies and the second group of photovoltaic panel assemblies are both connected to a first drawer-type slide rail, the first drawer-type slide rail is installed on the bracket, and the telescopic assembly is used to drive the first group of photovoltaic panel assemblies and the second group of photovoltaic panel assemblies to unfold outward or stack up and down.

[0012] Preferably, the telescopic assembly includes two first lead screws rotatably arranged on the bracket, the two first lead screws are connected by a chain transmission mechanism, the thread directions of the two first lead screws are opposite, the two first lead screws are threadedly connected to the first group of photovoltaic panel assemblies and the second group of photovoltaic panel assemblies respectively, and the telescopic assembly also includes a first drive motor that drives the first lead screws to rotate.

[0013] Preferably, the telescopic assembly further includes a first bevel gear and a second bevel gear, the first bevel gear is fixed to the main shaft of the first drive motor, the second bevel gear is fixed to a first lead screw, and the first bevel gear and the second bevel gear are meshed with each other.

[0014] Compared with the prior art, in the utility model, the second lifting mechanism drives the second unfolding mechanism and the second translation mechanism to move up and down, and the second translation mechanism drives the second unfolding mechanism to translate, and the two cooperate to enable the second unfolding mechanism to unfold or fold with the first unfolding mechanism. Similarly, the third unfolding mechanism is unfolded or folded with the cooperation of the third lifting mechanism and the third translation mechanism. When unfolding, the first unfolding mechanism, the second unfolding mechanism and the third unfolding mechanism are arranged flush, thereby preventing the occurrence of hot spot phenomenon. Secondly, the second lifting mechanism and the second translation mechanism are both located outside the second unfolding mechanism, and will not hinder the second unfolding mechanism from continuing to unfold itself. The third lifting mechanism and the third translation mechanism are both located outside the third unfolding mechanism, and will not hinder the third unfolding mechanism from continuing to unfold itself, thereby being able to obtain more photovoltaic unfolding area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is the front view of the utility model;

[0018] Figure 3 It is a right side view of the utility model;

[0019] Figure 4 It is a partial structural schematic diagram of the utility model;

[0020] Figure 5 A schematic diagram of another perspective of a partial structure of the utility model;

[0021] Figure 6 for Figure 4 A magnified schematic diagram of the structure in the middle.

[0022] Reference numerals:

[0023] 1. Frame, 2. First unfolding mechanism, 3. Second unfolding mechanism, 4. Third unfolding mechanism, 5. Second lifting mechanism, 6. Third lifting mechanism, 7. Second translation mechanism, 8. Third translation mechanism, 21. Bracket, 22. Telescopic assembly, 23. Three sets of photovoltaic panel assemblies, 24. First drawer-type slide rail, 221. First lead screw, 222. First drive motor, 223. First bevel gear, 224. Second bevel gear, 231. Bearing frame, 232. Nut sleeve, 233. Photovoltaic panel, 51. Second support plate, 52. Second lead screw, 53. Second drive motor, 54. Second guide rod, 55. Chain transmission mechanism, 56. Connecting beam, 57. Connecting piece, 71. Second vertical guide rail, 72. Second support rod, 73. Second slider, 74. Second power rod, 75. Second drawer-type slide rail, 76. Second connecting plate, 77. Second slider, 78. Second crossbeam. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Refer to the attached Figure 1 and attached Figure 2A photovoltaic expansion device includes a frame 1, on which a first unfolding mechanism 2, a second unfolding mechanism 3 and a third unfolding mechanism 4 are arranged in sequence from top to bottom, and the first unfolding mechanism 2, the second unfolding mechanism 3 and the third unfolding mechanism 4 are all installed with photovoltaic panels 233, the second unfolding mechanism 3 and the third unfolding mechanism 4 are respectively connected to a second lifting mechanism 5 and a third lifting mechanism 6, a second translation mechanism 7 is arranged between the second unfolding mechanism 3 and the frame 1, a third translation mechanism 8 is arranged between the third unfolding mechanism 4 and the frame 1, the second translation mechanism 7 and the third translation mechanism 8 are respectively arranged on both sides of the frame 1, the second lifting mechanism 5 is used to drive the second unfolding mechanism 3 and the second translation mechanism 7 to move up and down, and the third lifting mechanism 6 is used to drive the third unfolding mechanism 4 and the third translation mechanism 8 to move up and down. The second translation mechanism 7 includes: a second vertical guide rail 71, a second support rod 72, a second slider 73, a second power rod 74 and a second drawer-type slide rail 75. The second drawer-type slide rail 75 is respectively fixed to the second lifting mechanism 5 and the second unfolding mechanism 3. The second unfolding mechanism 3 can slide horizontally toward the outside of the frame 1 or be accommodated under the first unfolding mechanism 2 through the second drawer-type slide rail 75. The second slider 73 is fixed to the lower end of the second support rod 72, and the upper end of the second support rod 72 is slidably connected to the second unfolding mechanism 3. The second slider 73 slides up and down along the second vertical guide rail 71. One end of the second power rod 74 is hinged to the second slider 73, and the other end is hinged to the outer side of the second unfolding mechanism 3. The second power rod 74 is inclined. The structure of the third translation mechanism 8 is the same as that of the second translation mechanism 7; the second unfolding mechanism 3 is accommodated under the first unfolding mechanism 2 or unfolded outwardly to be flush with the first unfolding mechanism 2 through the cooperation of the second translation mechanism 7 and the second lifting mechanism 5. Specifically, the second unfolding mechanism 3 moves toward the outside of the frame 1 through the second translation mechanism 7, and then moves upward through the second lifting mechanism 5 to be flush with the first unfolding mechanism 2, that is, the photovoltaic panel 233 of the second unfolding mechanism 3 is flush with the photovoltaic panel 233 of the first unfolding mechanism 2. The third unfolding mechanism 4 is accommodated below the first unfolding mechanism 2 or unfolded outwardly to be flush with the first unfolding mechanism 2 through the cooperation of the third translation mechanism 8 and the third lifting mechanism 6. Specifically, the third unfolding mechanism 4 moves outwardly of the frame 1 through the third translation mechanism 8, and then moves upwardly through the third lifting mechanism 6 to be flush with the first unfolding mechanism 2, that is, the photovoltaic panel 233 of the third unfolding mechanism 4 is flush with the photovoltaic panel 233 of the first unfolding mechanism 2. In the utility model, the second power rod 74 drives the second unfolding mechanism 3 to slide outwardly, and the second unfolding mechanism 3 drives a part of the second drawer-type slide rail 75 to slide outwardly of the frame 1. Similarly, the third unfolding mechanism 4 slides outwardly of the frame 1 under the drive of the second power rod 74 of the third translation mechanism 8.When the second unfolding mechanism 3 moves outward to a predetermined position, the second lifting mechanism 5 drives the second drawer-type slide rail 75 to move upward, the second drawer-type slide rail 75 drives the second unfolding mechanism 3 to move upward, the second unfolding mechanism 3 drives the second support rod 72 and the second power rod 74 to move upward, the second support rod 72 and the second power rod 74 jointly drive the second slider 73 to slide upward along the second vertical guide rail 71, and the second unfolding mechanism 3 moves upward to be flush with the first unfolding mechanism 2, that is, the photovoltaic panel 233 on the second unfolding mechanism 3 is flush with the photovoltaic panel 233 on the first unfolding mechanism 2. Similarly, the third lifting mechanism 6 drives the third unfolding mechanism 4 to move upward until it is flush with the first unfolding mechanism 2, that is, the photovoltaic panel 233 on the third unfolding mechanism 4 is flush with the photovoltaic panel 233 on the first unfolding mechanism 2. Through this arrangement, the first unfolding mechanism 2, the second unfolding mechanism 3 and the third unfolding mechanism 4 can be arranged flush when unfolded, without generating shadows, and avoiding the hot spot effect. Secondly, the second lifting mechanism 5 and the second translation mechanism 7 are both located outside the second deployment mechanism 3 and will not hinder the second deployment mechanism 3 from continuing to deploy itself, so as to obtain more photovoltaic deployment area.

[0026] It should be noted that when achieving the flush distribution of the first unfolding mechanism 2, the second unfolding mechanism 3 and the third unfolding mechanism 4, the unfolding steps of the second unfolding mechanism 3 and the third unfolding mechanism 4 can be reasonably adjusted. For example, the second unfolding mechanism 3 can first slide outward and then move upward to be flush with the first unfolding mechanism 2, and then the third unfolding mechanism 4 can slide outward and then move upward to be flush with the first unfolding mechanism 2.

[0027] An implementation of the second lifting mechanism 5: The second lifting mechanism 5 includes a second support plate 51, the second support plate 51 is fixed to the second drawer-type slide rail 75, a second lead screw 52 is threadedly connected to the second support plate 51, the second lead screw 52 is rotatably connected to the frame 1, the second lead screw 52 is connected to the second drive motor 53, and a second guide rod 54 is slidably arranged on the second support plate 51, and the second guide rod 54 is fixed to the frame 1. The second drive motor 53 drives the second lead screw 52 to rotate and drive the second support plate 51 to move up and down along the second guide rod 54, and the up and down movement of the second support plate 51 drives the second drawer-type slide rail 75 to move up and down, thereby driving the second unfolding mechanism 3 to move up and down.

[0028] As another embodiment of the present invention: there are two second lead screws 52, the two second lead screws 52 are connected by a chain transmission mechanism 55, and the second drive motor 53 drives one second lead screw 52 to rotate and drives the other second lead screw 52 to rotate. The chain transmission mechanism 55 includes a chain and two sprockets, the sprockets are fixed to the second lead screw 52, ​​and the chain and the sprockets are meshed. There are two second guide rods 54, and the second lead screw 52 is located between the two second guide rods 54. This arrangement can make the second deployment mechanism 3 move up and down more smoothly.

[0029] As another embodiment of the present invention, the two second lead screws 52, the second support plate 51, the chain transmission mechanism 55 and the second driving mechanism form a set of lifting components, and a set of lifting components is respectively provided on both sides of the frame 1. This arrangement enables the second unfolding mechanism 3 to move up and down more smoothly.

[0030] An installation method of the second drawer-type slide rail 75 and the second unfolding mechanism 3 is as follows: the second drawer-type slide rail 75 is located below the second unfolding mechanism 3 , and the second drawer-type slide rail 75 is fixed to the second unfolding mechanism 3 via a second connecting plate 76 .

[0031] An implementation manner of a sliding connection between the second support rod 72 and the second unfolding mechanism 3: This embodiment further includes a second sliding rod 77 slidably arranged at the upper end of the second support rod 72, and both ends of the second sliding rod 77 are fixed to the second unfolding mechanism 3.

[0032] As another embodiment of the present invention: Figure 5 A connecting beam 56 is fixed between the two second support plates 51, which is beneficial to improving the structural strength of the second lifting mechanism 5. The connecting beam 56 is fixed to the second support rod 72 through a connecting piece 57. This arrangement is beneficial to improving the structural strength of the second support rod 72. When the second support plate 51 moves up and down, the second support rod 72 can be driven to move up and down through the connecting beam 56 and the connecting piece 57. Through this arrangement, the second unfolding mechanism 3 can move up and down more smoothly.

[0033] As another embodiment of the present utility model: the structure of the third lifting mechanism 6 is the same as that of the second lifting mechanism 5 , and the second supporting plate 51 of the third lifting mechanism 6 is located below the second supporting plate 51 of the second lifting mechanism 5 .

[0034] Specifically, the second power rod 74 is an electric push rod.

[0035] As another embodiment of the present invention: there are two second vertical guide rails 71, two second support rods 72, two second sliders 73 and two second power rods 74, the two second support rods 72 are fixed by a second crossbeam 78, and the two ends of the second crossbeam 78 are respectively fixed to the two second sliders 73. This arrangement can further improve the structural strength of the second translation mechanism 7.

[0036] An implementation method of the first unfolding mechanism 2: Figure 3 and attached Figure 4The first unfolding mechanism 2 includes: a bracket 21, a telescopic assembly 22 and three groups of photovoltaic panel assemblies 23, the third group of photovoltaic panel assemblies 23 is fixed on the bracket 21, the first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23 are both connected to the first drawer-type slide rail 24, the first drawer-type slide rail 24 is installed on the bracket 21, and the telescopic assembly 22 is used to drive the first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23 to unfold outward or stack up and down. The first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23 slide on the bracket 21 through the first drawer-type slide rail 24, and the telescopic assembly 22 is started to drive the first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23 to move back to back, and the three groups of photovoltaic panel assemblies 23 are unfolded in a staggered distribution state. The telescopic assembly 22 is started to drive the first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23 to move toward each other, and the three groups of photovoltaic panel assemblies 23 are folded and stacked up and down. This arrangement can further increase the photovoltaic deployment area, and on the basis of the deployment of the three deployment mechanisms, can effectively improve the flatness and reduce the occurrence of hot spots. Secondly, after folding, the occupied area can be minimized.

[0037] An embodiment of the telescopic assembly 22: Figure 6 The telescopic assembly 22 includes two first lead screws 221 rotatably arranged on the bracket 21, the two first lead screws 221 are connected through a chain transmission mechanism 55, the thread directions of the two first lead screws 221 are opposite, the two first lead screws 221 are respectively threadedly connected with the first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23, and the telescopic assembly 22 also includes a first driving motor 222 that drives the first lead screws 221 to rotate, and the first lead screw 221 is rotatably connected with the bracket 21. The first driving motor 222 drives one first lead screw 221 to rotate, and then drives another first lead screw 221 to rotate through the chain transmission mechanism 55, thereby driving the first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23 to slide toward or away from each other, so that the three groups of photovoltaic panel assemblies 23 can be quickly unfolded or retracted.

[0038] As another embodiment of the present utility model: the telescopic assembly 22 also includes a first bevel gear 223 and a second bevel gear 224, the first bevel gear 223 is fixed to the main shaft of the first drive motor 222, the second bevel gear 224 is fixed to a first lead screw 221, the first bevel gear 223 and the second bevel gear 224 are meshed, a shaft seat is fixed on the bracket 21, the end of the first lead screw 221 is rotatably set on the shaft seat, and the first drive motor 222, the first bevel gear 223 and the second bevel gear 224 are all set between the two shaft seats. This arrangement can make the structure of the telescopic assembly 22 compact, and can reduce the occupied area of ​​the first unfolding mechanism 2 when in the folded state.

[0039] As another embodiment of the present utility model: the first group of photovoltaic panel assemblies 23 and the second group of photovoltaic panel assemblies 23 both include a bearing frame 231, the bearing frame 231 is connected to the bracket 21 through the first drawer-type slide rail 24, a nut sleeve 232 is fixed to the bearing frame 231, the nut sleeve 232 is threadedly connected to the first lead screw 221, and the photovoltaic panel 233 is installed on the bearing frame 231. The photovoltaic panel 233 on each bearing frame 231 can be one or more. The third group of photovoltaic panel assemblies 23 include a bearing frame 231 and a photovoltaic panel 233 arranged on the bearing frame 231, and the bearing frame 231 of the third group of photovoltaic panel assemblies 23 is fixed to the bracket 21.

[0040] As another implementation of the present utility model: the structure of the second unfolding mechanism 3 and the structure of the third unfolding mechanism 4 are both the same as the structure of the first unfolding mechanism 2 .

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A photovoltaic expansion device, characterized in that: The invention comprises a frame, wherein the frame is provided with a first unfolding mechanism, a second unfolding mechanism and a third unfolding mechanism in sequence from top to bottom, the second unfolding mechanism and the third unfolding mechanism are respectively connected to a second lifting mechanism and a third lifting mechanism, a second translation mechanism is provided between the second unfolding mechanism and the frame, a third translation mechanism is provided between the third unfolding mechanism and the frame, the second translation mechanism and the third translation mechanism are respectively arranged on both sides of the frame, the second translation mechanism comprises: a second vertical guide rail, a second support rod, a second slider, a second power rod and a second drawer-type slide rail, the second drawer-type slide rail is respectively fixed to the second lifting mechanism and the second unfolding mechanism, the second The slider is fixed to the lower end of the second support rod, the upper end of the second support rod is slidably connected to the second unfolding mechanism, the second slider slides up and down along the second vertical guide rail, one end of the second power rod is hinged to the second slider, and the other end is hinged to the outer side of the second unfolding mechanism, the structure of the third translation mechanism is the same as that of the second translation mechanism; the second unfolding mechanism is accommodated below the first unfolding mechanism or unfolded outwardly and flush with the first unfolding mechanism through the cooperation of the second translation mechanism and the second lifting mechanism, and the third unfolding mechanism is accommodated below the first unfolding mechanism or unfolded outwardly and flush with the first unfolding mechanism through the cooperation of the third translation mechanism and the third lifting mechanism.

2. The photovoltaic expansion device according to claim 1, characterized in that: The second lifting mechanism includes a second support plate, which is fixed to the second drawer-type slide rail, a second lead screw is threadedly connected to the second support plate, the second lead screw is rotatably connected to the frame, the second lead screw is connected to a second drive motor, and a second guide rod is slidably arranged on the second support plate, and the guide rod is fixed to the frame.

3. The photovoltaic expansion device according to claim 2, characterized in that: There are two second lead screws, which are connected via a chain transmission mechanism. The second drive motor drives one second lead screw to rotate, thereby driving the other second lead screw to rotate.

4. The photovoltaic expansion device according to claim 1, characterized in that: The second drawer-type slide rail is located below the second unfolding mechanism, and the second drawer-type slide rail is fixed to the second unfolding mechanism via a second connecting plate.

5. The photovoltaic expansion device according to claim 2, characterized in that: It also includes a second sliding rod slidably arranged on the upper end of the second support rod, and both ends of the second sliding rod are fixed to the second unfolding mechanism.

6. The photovoltaic expansion device according to claim 5, characterized in that: A connecting beam is fixed between the two second supporting plates, and the connecting beam is fixed to the second supporting rod through a connecting piece.

7. The photovoltaic expansion device according to claim 6, characterized in that: There are two of each of the second vertical guide rail, the second support rod, the second slider and the second power rod. The two second support rods are fixed by a second cross beam, and the two ends of the second cross beam are respectively fixed to the two second sliders.

8. The photovoltaic expansion device according to claim 1, characterized in that: The first unfolding mechanism includes: a bracket, a telescopic assembly and three groups of photovoltaic panel assemblies, the first group of photovoltaic panel assemblies and the second group of photovoltaic panel assemblies are both connected to a first drawer-type slide rail, the first drawer-type slide rail is installed on the bracket, and the telescopic assembly is used to drive the first group of photovoltaic panel assemblies and the second group of photovoltaic panel assemblies to unfold outward or stack up and down.

9. The photovoltaic expansion device according to claim 8, characterized in that: The telescopic assembly includes two first lead screws rotatably arranged on a bracket, the two first lead screws are connected by a chain transmission mechanism, the thread directions of the two first lead screws are opposite, the two first lead screws are threadedly connected to the first group of photovoltaic panel assemblies and the second group of photovoltaic panel assemblies respectively, and the telescopic assembly also includes a first drive motor that drives the first lead screws to rotate.

10. The photovoltaic expansion device according to claim 9, characterized in that: The telescopic assembly further includes a first bevel gear and a second bevel gear, wherein the first bevel gear is fixed to the main shaft of the first drive motor, and the second bevel gear is fixed to a first lead screw, and the first bevel gear and the second bevel gear are meshed with each other.

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