CN116054695A

CN116054695A - Photovoltaic device

Info

Publication number: CN116054695A
Application number: CN202111260826.8A
Authority: CN
Inventors: 高峰; 刘在祥; 陈艳凤; 蔡园丰; 严洪; 高天奇
Original assignee: Shanghai Xingye Material Technology Co Ltd
Current assignee: Shanghai Xingye Material Technology Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2023-05-02

Abstract

The application relates to a photovoltaic device, which comprises a first bracket, a plurality of rotating shafts, a plurality of photovoltaic plates and a driving device, wherein the driving device is connected with the rotating shafts through a transmission assembly so as to drive the rotating shafts to rotate around respective axes; the transmission assembly comprises a plurality of first rotating wheels, a plurality of second rotating wheels, a plurality of first rope portions, a plurality of second rope portions and a reciprocating traction seat which are matched with each other. The transmission assembly for transmitting the driving force to the photovoltaic plate in the photovoltaic device is low in cost and high in reliability, can transmit torque to the rotating shaft for driving the photovoltaic plate more uniformly, effectively prevents the rotating shaft and the photovoltaic plate from generating distortion, and has a limiting function on the maximum rotating angle of the photovoltaic plate.

Description

Photovoltaic device

Technical Field

The application relates to the field of photovoltaics, in particular to a photovoltaic device.

Background

Solar energy is increasingly used as a clean renewable energy source, and especially, tracking photovoltaic power generation technology is an emerging solar energy utilization technology following conventional photovoltaic power generation technology.

The solar tracking system can keep the photovoltaic panel facing the sun as far as possible, improves the generating capacity of the solar photovoltaic module, effectively reduces the investment cost of the photovoltaic power generation system, and improves the utilization rate of the solar photovoltaic module.

A photovoltaic tracking system employing a plurality of photovoltaic panels sharing a support is a trend of future solar tracking photovoltaic systems. The current commonly used tracking photovoltaic support is mainly of a single-motor connecting rod multipoint linkage structure, but the structure has a plurality of defects:

for example, the parts are high in cost, inconvenient to install and high in manual assembly cost; for another example, the connecting rod arranged in the transmission mechanism is very long, and the risk of twisting and twisting deformation easily occurs, so that the service life of the tracking system is reduced; as another example, the driving force provided by the driving device cannot be transmitted to the photovoltaic panel more uniformly by the transmission mechanism, so that the photovoltaic panel is easy to distort and deform and even is damaged in structure; also, if the transmission mechanism itself does not have a limiting function for the transmission angle, once the motor operation angle is not well controlled, the photovoltaic panel may collide with the bracket and be damaged.

Disclosure of Invention

In order to solve at least one of the problems, the application provides a photovoltaic device, and a transmission assembly for transmitting driving force to a photovoltaic plate in the photovoltaic device is low in cost and high in reliability, and can transmit torque to a rotating shaft for driving the photovoltaic plate more uniformly, so that the rotating shaft and the photovoltaic plate are effectively prevented from generating distortion, and the transmission assembly has a limiting function on the maximum rotating angle of the photovoltaic plate.

The technical scheme of the application is as follows:

a photovoltaic device, comprising:

a first bracket;

a plurality of rotating shafts arranged parallel to each other in a first direction, and each of the rotating shafts is connected to the first bracket in a rotatable manner about its own axis;

a plurality of photovoltaic panels arranged along the first direction and fixed to the plurality of rotating shafts in one-to-one correspondence, respectively; and

the driving device is connected with the rotating shafts through a transmission assembly to drive the rotating shafts to rotate around respective axes;

the transmission assembly includes:

a plurality of first rotating wheels coaxially fixed to the plurality of rotating shafts in one-to-one correspondence, respectively, and arranged in a first row at intervals from each other in the first direction;

a plurality of second rotating wheels coaxially fixed to the plurality of rotating shafts in one-to-one correspondence, respectively, and arranged in a second row spaced apart from each other in the first direction, wherein the second row is parallel to the first row;

a plurality of first rope portions, one first rope portion is respectively connected between every two adjacent first rotating wheels and between two first rotating wheels at the end part, and one end of each two adjacent first rope portions respectively surrounds and is fixed to the corresponding first rotating wheel in opposite directions;

a plurality of second rope portions, wherein one second rope portion is respectively connected between every two adjacent second rotating wheels and between two second rotating wheels at the end part, and one end of each two adjacent second rope portions surrounds and is fixed to the corresponding second rotating wheel in the opposite direction;

the reciprocating traction seat can reciprocate along the first direction under the drive of the driving device, one of the first rope portions is fixedly connected with the reciprocating traction seat, and the other of the second rope portions is fixedly connected with the reciprocating traction seat.

In an alternative design, the transmission assembly further comprises:

a screw rod seat fixed with the first bracket and

the screw rod is rotatably connected to the screw rod seat and extends along the first direction;

the driving device is a motor which is fixed on the screw rod seat and used for driving the screw rod to rotate, the reciprocating traction seat is connected to the screw rod seat in a mode of being capable of moving along the first direction, and the reciprocating traction seat is in threaded connection with the screw rod.

In an alternative design, the screw rod seat comprises two guide rods which are parallel to each other and extend along the first direction, and the reciprocating traction seat is movably connected with the two guide rods.

In an alternative design, the transmission assembly further includes a plurality of first guide wheels and a plurality of second guide wheels rotatably coupled to the first bracket;

for one first rope portion of the plurality of first rope portions, one end of the first rope portion is wound around a first one of the first guide wheels and then wound around and fixed to a first one of the first rotating wheels, and the other end of the first rope portion is wound around a second one of the first guide wheels and then wound around and fixed to a second one of the first rotating wheels, and the first rope portion extends between the first one of the first guide wheels and the second one of the first guide wheels along the first direction and is fixedly connected with the reciprocating fifth wheel;

for one of the plurality of second rope portions, one end of the second rope portion is wound around a first one of the second guide wheels and then wound around and fixed to a first one of the second wheels, and the other end of the second rope portion is wound around a second one of the second guide wheels and then wound around and fixed to a second one of the second wheels, the second rope portion extends between the first and second guide wheels in the first direction and is fixedly connected to the reciprocating fifth wheel.

In an alternative design, for the first rope portion fixedly connected with the reciprocating fifth wheel, it comprises a first sub-rope portion, one end of which is fixed to the reciprocating fifth wheel and the other end of which is fixed around and to a corresponding one of the first wheels, and a second sub-rope portion, one end of which is fixed to the reciprocating fifth wheel and the other end of which is fixed around and to a corresponding other one of the first wheels;

for the second rope portion fixedly connected with the reciprocating traction seat, it comprises a third sub-rope portion, one end of which is fixed to the reciprocating traction seat and the other end of which is wound around and fixed to a corresponding one of the second wheels, and a fourth sub-rope portion, one end of which is fixed to the reciprocating traction seat and the other end of which is wound around and fixed to a corresponding other of the second wheels.

In an alternative design, the transmission assembly further includes a plurality of first guide wheels and a plurality of second guide wheels rotatably connected to the first bracket, wherein each of the two ends of the first rope portion respectively bypasses the corresponding two first guide wheels and respectively surrounds and is fixed to the corresponding two first guide wheels, each of the two ends of the second rope portion respectively bypasses the corresponding two second guide wheels and respectively surrounds and is fixedly connected to the corresponding two second guide wheels, each of the first rope portion extends in the first direction between the corresponding two first guide wheels, and each of the second rope portion extends in the first direction between the corresponding two second guide wheels.

In an alternative design, the transmission assembly further comprises at least one first guide wheel and at least one second guide wheel rotatably connected to the first bracket, wherein each first guide wheel corresponds to one first rotating wheel, and each second guide wheel corresponds to one second rotating wheel;

at least one end of two adjacent first rope portions respectively winds around the corresponding first guide wheel in opposite directions and then winds around and fixes the corresponding first rotating wheel in opposite directions, and the two first rope portions are arranged in an X-shaped cross manner between the corresponding first guide wheel and the corresponding first rotating wheel;

at least one end of two adjacent second rope portions respectively winds around the corresponding second guide wheels in opposite directions and then winds around and fixes the corresponding second rotating wheels in opposite directions, and the two second rope portions are arranged in an X-shaped cross manner between the corresponding second guide wheels and the second rotating wheels.

In an alternative design, at least part of adjacent two first rope portions are integrally connected, and non-end positions of the integrally connected two first rope portions are fixed on the corresponding first rotating wheels;

at least part of two adjacent second rope portions are integrally connected, and the non-end parts of the two integrally connected second rope portions are fixed on the corresponding second rotating wheels.

In an alternative design, each of the first rope portions and each of the second rope portions are steel ropes;

each first rope portion and each second rope portion are connected with an elastically telescopic rope connector in series, or each first rope portion and each second rope portion are connected with a tensioning wheel.

In an alternative design, under any working condition, the sum of the surrounding angles of one end of at least part of two adjacent first rope portions on the corresponding first rotating wheel is smaller than 360 degrees, and the sum of the surrounding angles of one end of at least part of two adjacent second rope portions on the corresponding second rotating wheel is smaller than 360 degrees.

The application has at least the following beneficial effects:

1. the transmission component for transmitting the driving force to the photovoltaic panel in the photovoltaic device is mainly characterized in that the main parts are ropes with low cost, and the ropes are mainly subjected to tensile stress when in use, so that the reliability is high, the damage is not easy, and the service life is long.

2. When the photovoltaic panel traction device works, the first rope portions and the second rope portions on two sides are pulled by the same reciprocating traction seat to synchronously move, so that the balance of the tensile force borne by the first rotating wheel and the second rotating wheel on the rotating shaft is ensured to a certain extent, the torsional forces borne by two sides of the rotating shaft tend to be balanced, and the rotating shaft and the photovoltaic panel on the rotating shaft are prevented from being subjected to obvious torsional deformation.

3. Each rope and runner in this photovoltaic device transmission movable assembly adopt specific structure to mutually support, utilize the mechanical structure of transmission assembly self alright restriction photovoltaic board's turned angle to avoid photovoltaic board and support to produce the collision, guarantee photovoltaic board's life, also help the increase design of the size of photovoltaic board especially length dimension.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present application and are not limiting of the present application.

Fig. 1 is a schematic view of the overall structure of a photovoltaic device according to the first embodiment of the present application.

Fig. 2 is a schematic view of the structure of the photovoltaic panel of fig. 1 after removal.

Fig. 3 is a schematic top view of fig. 2.

Fig. 4 is a partial structural schematic diagram of fig. 2.

Fig. 5 is a partial structural schematic diagram of fig. 4.

Fig. 6 is a schematic structural diagram of a first rotating wheel in a second embodiment of the present application.

Fig. 7 is a schematic structural view of two adjacent first rope portions in the second embodiment of the present application.

Fig. 8 is a schematic diagram of a connection structure of two adjacent first rope segments on corresponding first wheels in the second embodiment of the present application. Reference numerals illustrate:

f1-a first direction;

the device comprises a first bracket, a 2-rotating shaft, a 3-photovoltaic panel, a 4-driving device, a 5-reciprocating traction seat, a 6-first rotating wheel, a 7-second rotating wheel, an 8-first rope portion, a 9-second rope portion, a 10-screw rod seat, a 11-screw rod, a 12-first guide wheel, a 13-second guide wheel, a 14-rope connector and a 15-clamping block;

601-clamping grooves;

801-first sub-rope portion, 802-second sub-rope portion, 901-third sub-rope portion, 902-fourth sub-rope portion;

1001-guide bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application based on the described embodiments. It is to be understood that some of the technical means of the various embodiments described herein may be interchanged or combined without conflict.

In the description of the present specification and claims, the terms "first," "second," and the like, if any, are used merely to distinguish between the described objects and do not have any sequential or technical meaning. Thus, an object defining "first," "second," etc. may explicitly or implicitly include one or more such objects. Also, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one, and "a plurality" of "are used to indicate no less than two.

In the description of the present application and the claims, the terms "connected," "mounted," "secured," "received," and the like are to be construed broadly unless otherwise indicated. For example, "connected" may be connected in a split manner, or may be integrally connected; can be directly connected or indirectly connected through an intermediate medium; either non-detachably or detachably. For another example, "accommodated" does not necessarily mean that the whole is completely accommodated, and the concept also includes a case of partial accommodation in which a part protrudes outside. The specific meaning of the aforementioned terms in the present application can be understood by those skilled in the art according to the specific circumstances.

In the description of the present application and the claims, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "horizontal", etc., based on the azimuth or positional relationship shown in the drawings, this is merely for convenience of clarity and simplicity of description of the application, rather than to indicate or imply that the elements referred to must have a specific direction, be constructed and operated in a specific azimuth, these directional terms being relative concepts for relative description and clarity, and may be changed accordingly according to a change in azimuth in which the components are placed in the drawings. For example, if the device is turned over in the figures, elements described as "below" other elements would then be oriented "above" the other elements.

In the description of the present specification and claims, if the terms "sequential", "order", such as the phrase "A, B, C arranged in sequence", are used merely to indicate the arrangement of the elements A, B, C, the possibility of arranging other elements between a and B and/or between B and C is not excluded.

In the description of the present application and the claims, if there is a "direction" with respect to movement, including movement having a directional component, the term "in a direction" is not necessarily to be understood as movement in only that one direction, and the specific meaning of the foregoing terms in the present application may be understood by those skilled in the art according to the specific circumstances.

Embodiments of the present application will now be described with reference to the accompanying drawings.

< embodiment >

Fig. 1 to 5 show a specific embodiment of the photovoltaic device of the present application, which comprises a first bracket 1, a plurality of rotating shafts 2, a plurality of photovoltaic panels 3, and a driving device 4. Wherein:

the plurality of rotating shafts 2 are arranged parallel to each other in the first direction F1, and each of the rotating shafts 2 is connected to the first bracket 1 in a rotatable manner about its own axis. The weight of the rotating shaft 2 is supported by the first bracket 1. In a specific embodiment, a plurality of bearing seats are arranged on the first bracket 1, and two ends of each rotating shaft 2 are respectively connected to two corresponding bearing seats.

The plurality of photovoltaic panels 3 are also arranged along the first direction F1, and the plurality of photovoltaic panels 3 are respectively fixed to the plurality of rotating shafts 2 in one-to-one correspondence. When the rotation shaft 2 rotates, the photovoltaic panel 3 fixed to the rotation shaft 2 follows the rotation thereof, thereby adjusting the light incidence angle of the photovoltaic panel 3. The weight of the photovoltaic panel 3 is also supported by the first bracket 1.

The driving device 4 is connected with the rotating shafts 2 through a transmission assembly to drive the rotating shafts 2 to rotate around the respective axes respectively, so as to adjust the angle of each photovoltaic panel 3.

The transmission assembly comprises a plurality of first wheels 6, a plurality of second wheels 7, a plurality of first rope portions 8, a plurality of second rope portions 9, and a reciprocating fifth wheel 5. Wherein:

the plurality of first rotating wheels 6 are coaxially fixed to the plurality of rotating shafts 2 in one-to-one correspondence, respectively, and the plurality of first rotating wheels 6 are aligned in a line with each other at a distance in the first direction F1. For ease of description, the row in which the plurality of first wheels 6 is located will be referred to herein as the first row.

The plurality of second rotating wheels 7 are coaxially fixed to the plurality of rotating shafts 2 in one-to-one correspondence, respectively, and the plurality of second rotating wheels 7 are aligned in a line at intervals from each other in the first direction F1. For ease of description, the row in which the plurality of second wheels 7 are located is referred to herein as a second row, which is parallel to the first row.

A first rope portion 8 is connected between each adjacent two first pulleys 6 and between the two first pulleys 6 at the extreme end, and one end of each adjacent two first rope portions 8 is wound around and fixed to the corresponding first pulley 6 in opposite directions, respectively.

Referring to fig. 2 and 4, the above-mentioned "surrounds and is fixed to" in opposite directions, respectively, has the meaning of: for two adjacent first rope portions 8, one end of one first rope portion 8 is wound around and fixed to the corresponding first wheel 6 in a clockwise direction, and one end of the other first rope portion 8 is wound around and fixed to the first wheel 6 in a counter-clockwise direction, the winding directions of the two first rope portions 8 on the same first wheel 6 being opposite.

It is understood that "surrounding" includes both full and non-full (e.g., half or 1/8 of a circle) surrounding.

Since one end of each of the two adjacent first rope portions 8 (the first rope portion 8 and the second first rope portion 8, respectively) is wound around and fixed to the corresponding first reel 6 in opposite directions, when the first rope portion 8 pulls the first reel 6 to rotate so that the first rope portion 8 is unreeled from the first reel 6, the first reel 6 must wind the second first rope portion 8.

A second rope portion 9 is connected between each adjacent two second wheels 7 and between the two second wheels 7 at the extreme end, and one end of each adjacent two second rope portions 9 is wrapped around and fixed to the corresponding second wheel 7 in opposite directions, respectively.

The reciprocating traction seat 5 can reciprocate along a first direction F1 under the drive of the drive device 4, wherein one first rope portion 8 is fixedly connected with the reciprocating traction seat 5, and one second rope portion 9 is fixedly connected with the reciprocating traction seat 5.

Referring to fig. 1 to 4, if each photovoltaic panel 3 in fig. 1 is intended to be rotated about the axis of the rotating shaft 2 in a counterclockwise direction to a desired inclination, the driving device 4 can be controlled to drive the reciprocating traction seat 5 to move leftwards in fig. 2 and 4, and the reciprocating traction seat 5 simultaneously pulls the first rope portion 8 and the second rope portion 9 fixed thereto to move leftwards. The first rope portion 8 moving to the left pulls the first rotating wheel 6 on the right in fig. 4 to rotate counterclockwise, the second rope portion 9 moving to the left pulls the second rotating wheel 7 on the right in fig. 4 to rotate counterclockwise, the first rotating wheel 6 on the right in fig. 4 and the second rotating wheel 7 on the right wind up the corresponding first rope portion 8 and second rope portion 9, and further pulls the first rotating wheel 6 on the right and second rotating wheels 7 not shown in fig. 4 to rotate counterclockwise, so that all the rotating shafts 2 are pulled to rotate counterclockwise (wherein the leftmost rotating shaft 2 in fig. 2 is pulled to rotate by the corresponding first rope portion 8 by the rightmost rotating shaft 2), thereby driving each photovoltaic panel 3 in fig. 1 to rotate counterclockwise to a desired angle.

In the above adjusting process, since the first rotating wheel 6 and the second rotating wheel 7 which are spaced from each other are coaxially fixed on each rotating shaft 2, the first rotating wheel 6 and the second rotating wheel 7 apply rotating torque to the rotating shafts 2 under the pulling of the ropes, so that the rotating stability of the rotating shafts 2 is improved, the torsional deformation degree of the rotating shafts 2 and the photovoltaic panels 3 is reduced, and the photovoltaic panels 3 fixed on the rotating shafts 2 are prevented from deforming. Preferably, the first rotating wheel 6 and the second rotating wheel 7 are respectively connected at opposite ends of the rotating shaft 2. And when in operation, the first rope portion 8 and the second rope portion 9 on two sides are pulled by the same reciprocating traction seat 5 to synchronously move, so that the balance of the tensile force borne by the first rotating wheel 6 and the second rotating wheel 7 on the rotating shaft 2 is ensured to a certain extent, the torsion forces borne by two ends of the rotating shaft tend to be balanced, and the rotating shaft and the photovoltaic panel on the rotating shaft are prevented from generating more obvious torsional deformation.

In the present embodiment, the driving device 4 drives the reciprocating fifth wheel 5 to reciprocate along the first direction F1 through the screw 11 mechanism. Specifically, the transmission assembly further includes a screw holder 10 and a screw 11, wherein the screw holder 10 is fixed to the first bracket 1, the screw 11 is rotatably connected to the screw holder 10, and a length of the screw 11 extends in the first direction F1. The reciprocating fifth wheel 5 is connected to the screw base 10 in such a manner as to be movable in the first direction F1, and the reciprocating fifth wheel 5 is screwed with the screw 11. The driving device 4 is a motor fixed on the screw rod seat 10, and the motor is connected with the screw rod 11 to drive the screw rod 11 to rotate, so that the rotating screw rod 11 drives the reciprocating traction seat 5 in threaded connection with the screw rod to move along the first direction F1.

In order to improve the stability of the movement of the reciprocating fifth wheel 5 along the first direction F1, the above-mentioned screw rod seat 10 further comprises two guide rods 1001 parallel to each other and extending along the first direction F1, and the reciprocating fifth wheel 5 is movably connected to the two guide rods 1001.

Referring to fig. 1 to 4 again, in order to raise the rotatable angle of the photovoltaic panel 3 and prevent the photovoltaic panel 3 from touching the first rope portion 8 or the second rope portion 9 to generate structural damage during large-angle rotation, the transmission assembly of the present embodiment is further configured with a plurality of first guide wheels 12 and a plurality of second guide wheels 13 rotatably connected to the first bracket 1. The two first rotating wheels 6 at the end part respectively correspond to the two first guiding wheels 12, and the rest of the first rotating wheels 6 respectively correspond to one first guiding wheel 12. The two second rotating wheels 7 at the end part respectively correspond to the two second guiding wheels 13, and the other second rotating wheels 7 respectively correspond to one second guiding wheel 13. The two ends of each first rope portion 8 are respectively wound around and fixed to the corresponding two first guide wheels 12, respectively, and the two ends of each second rope portion 9 are respectively wound around and fixed to the corresponding two second guide wheels 13, respectively. Furthermore, the first rope portions 8 and the second rope portions 9 are guided and limited by the first guide wheels 12 and the second guide wheels 13, each first rope portion 8 extending in the first direction F1 between the corresponding two first guide wheels 12, each second rope portion 9 extending in the first direction F1 between the corresponding two second guide wheels 13.

The main body parts of the respective first and

second rope portions

8, 9 are guided by the guide wheels to a position at a distance from the respective rotational axis 2 and extend in the first direction F1, which not only reduces rotational disturbances of the respective rope portions to the photovoltaic panel 3, but also contributes to improving the structural integrity of the photovoltaic device. It will be appreciated that if the first guide wheel 12 and the second guide wheel 13 in fig. 2 and 4 are eliminated, the rotatable angular range of the photovoltaic panel 3 will be greatly reduced.

Referring to fig. 2 and 4 again, further, the reciprocating fifth wheel 5 is specifically fixedly connected to the extending portion of the first rope portion 8 in the first direction F1, and is fixedly connected to the extending portion of the second rope portion 9 in the first direction F1. It will be appreciated that the direction of movement of the reciprocating fifth wheel 5 and the direction of extension of the first rope portion 8 and the second rope portion 9 secured to the reciprocating fifth wheel 5 are in the same direction, which helps to improve the operational stability of the photovoltaic device.

Further, referring again to fig. 4, for the first rope portion 8 fixedly connected to the reciprocating fifth wheel 5, it comprises a first sub-rope portion 801 and a second sub-rope portion 802. One end of first sub-string portion 801 is welded or pinned to reciprocating fifth wheel 5 and the other end is wrapped around and secured to a corresponding one of first wheels 6 after bypassing a corresponding one of first wheels 12. One end of the second sub-rope portion 802 is welded or fastened by means of a bayonet to the reciprocating fifth wheel 5 and the other end is wound around the corresponding further first guiding wheel 12 and fastened to the corresponding further second wheel 7. It can be seen that in the present embodiment, the first rope portion 8 fixedly connected to the reciprocating fifth wheel 5 is not of unitary construction, but is formed of two mutually independent sub-rope portions, which is advantageous in that: the installation of the first rope portion 8 on the present photovoltaic device is facilitated. Symmetrically, the second rope portion 9, which is fixedly connected to the reciprocating fifth wheel 5, comprises a third sub-rope portion 901 and a fourth sub-rope portion 902. One end of the third sub-rope portion 901 is fixed to the reciprocating fifth wheel 5 and the other end is wound around and fixed to a corresponding one of the second wheels 7 after having wound around a corresponding one of the second guide wheels 13. The fourth sub-rope portion 902 is fixed at one end to the reciprocating fifth wheel 5 and at the other end around and to the corresponding other second wheel 7 after having passed around the corresponding other second guide wheel 13.

In another embodiment, the first rope portion 8 fixedly connected with the reciprocating traction seat 5 is of an integral structure, the middle portion of the first rope portion is fastened on the reciprocating traction seat 5 through a locking piece, and two ends of the first rope portion respectively bypass the two corresponding first guide wheels 12 and respectively surround and are fixed to the two corresponding first rotating wheels 6; the second rope portion 9 fixedly connected with the reciprocating traction seat 5 is of an integral structure, the middle portion of the second rope portion is fastened on the reciprocating traction seat 5 through a locking block, and two ends of the second rope portion respectively bypass the two corresponding second guide wheels 13 and then respectively encircle and are fixed to the two corresponding second rotating wheels 7.

As described above, each first wheel 6 except for the two first wheels 6 at the extreme end corresponds to one first guide wheel 12, and each second wheel 7 except for the two second wheels 7 at the extreme end corresponds to one second guide wheel 13. The first guiding wheels 12 and the first rotating wheels 6 which are in one-to-one correspondence, and the second guiding wheels 13 and the second rotating wheels 7 which are in one-to-one correspondence are also provided with the following design characteristics: referring to fig. 2 and 4, one end of each of the two adjacent first rope portions 8 respectively bypasses the corresponding first guiding wheel 12 in opposite directions, then surrounds and fixes the corresponding first guiding wheel 6 in opposite directions, and the two first rope portions (i.e. the two adjacent first rope portions 8) are disposed in an X-shaped cross between the corresponding first guiding wheel 12 and the first guiding wheel 6. One end of each of the two adjacent second rope portions 9 bypasses the corresponding second guide wheel 13 in the opposite direction, then surrounds and fixes the corresponding second rotating wheel 7 in the opposite direction, and the two adjacent second rope portions 9 are arranged in an X-shaped cross between the corresponding second guide wheel 13 and the second rotating wheel 7.

It can be seen that, for the first guide wheel 12 and the first rotating wheel 6 which are in one-to-one correspondence, and the second guide wheel 13 and the second rotating wheel 7 which are in one-to-one correspondence in fig. 2, each first rotating wheel 6 and each second rotating wheel 7 respectively guide the trend of two rope portions, and the radial forces exerted by the two rope portions on the guide wheels are opposite to have a counteracting effect, thereby improving the rotation smoothness of the first guide wheel 12 and the second guide wheel 13. The two rope portions between the rotating wheel and the guide wheel are arranged in an X-shaped cross mode, so that the counteracting effect is more obvious, and the rotation smoothness of the guide wheel is further improved.

In this embodiment each first rope portion 8 and each second rope portion 9 is a high strength steel rope. If the length of each of the first and

second rope portions

8, 9 is fixed and not adjustable, problems may occur in that the relevant rope portion cannot be fitted to the device or that the fitted rope portion is too loose. In this regard, the present embodiment is designed as follows: each first rope portion 8 and each second rope portion 9 is connected in series with an elastically stretchable rope connector 14.

The elastically stretchable rope connector 14 is commercially available or self-designed, and for example, a patent of China patent publication No. CN212839179U discloses an elastically stretchable rope connector 14. Furthermore, the applicant has proposed an alternative rope connector 14 in chinese patent application No. 2021222779475. Generally, the elastically stretchable rope connectors 14 are each provided with a spring.

In another embodiment, no elastically stretchable rope connector 14 is arranged on both the first rope portion 8 and the second rope portion 9, but a plurality of tensioning wheels are arranged on the first support 1, one tensioning wheel being connected to each first rope portion 8 and each second rope portion 9, respectively, so that each first rope portion 8 and second rope portion 9 is connected in tension between the corresponding two first wheels 6 and the corresponding two second wheels 7 by means of the tensioning wheels.

In this embodiment, two adjacent first rope portions 8 or two adjacent second rope portions 9 are not directly connected (unlike the second embodiment described later), and each first rope portion 8 and each second rope portion 9 are independent rope portions. The fixing mode of the end part of each rope part and the corresponding rotating wheel can be as follows: the rotating wheel is provided with a clamping groove, and a clamping block arranged at the end part of the rope part is clamped into the clamping groove. The applicant has proposed a possible solution in the patent application 2021222678968.

As already mentioned above, the first rope portion 8 and the second rope portion 9 are "wound" on the first wheel 6 and the second wheel 7, either entirely or non-entirely. However, if each rope portion is circumferentially (greater than 360 °) wrapped around the corresponding first and

second pulleys

6, 7, there will be a drawback in that:

under the power of the driving device 4, the rope may pull the first rotating wheel 6 and the second rotating wheel 7 to turn over all the circle or even a plurality of circles, and then drive the photovoltaic panel 3 to rotate all the circle. If it is ensured that the photovoltaic panel 3 can rotate around the whole circumference, the length of the photovoltaic panel 3 must be smaller than the length of the rotating shaft 2, otherwise (i.e. the length of the photovoltaic panel 3 is greater than the length of the rotating shaft 2), the photovoltaic panel 3 must be blocked by the first bracket 1 to collide and cause structural damage. However, reducing the length of the photovoltaic panel 3 not only reduces the power generation amount of the photovoltaic device, but also brings about an increase in the overall cost of the photovoltaic device.

For the above reasons, in order to limit the rotatable range of the photovoltaic panel 3 to an angle at which collision is not blocked with the first bracket 1, the present embodiment is designed such that: in any operating state, the sum of the angles of wrap of the ends of at least partially adjacent two first rope portions 8 on the respective first reel 6 is less than 360 degrees.

When one of the first rope portions 8 pulls the corresponding first reel 6 to rotate, the rope portion is unreeled from the first reel 6, and its angle of wrap (or winding angle) on the first reel 6 gradually decreases. After the first rope portion 8 is unwound to its end portion straightened and the direction of the pulling force on the first pulley 6 passes the rotational axis of the first pulley 6, the pulling force of the first rope portion 8 on the first pulley 6 does not generate a rotational moment, and no matter how much pulling force the first rope portion 8 exerts on the first pulley 6, the first pulley 6 will not continue to rotate due to the pulling force, and the unwinding angle of the first pulley 6 is about its original winding angle. Similarly, the unreeling angle of the other first rope portion 8 correspondingly adjacent to the aforementioned first rope portion 8 has the same characteristics. Therefore, if the sum of the surrounding angles of two adjacent first rope portions 8 on the corresponding first rotating wheel 6 is smaller than 360 degrees, the rotating angle of the corresponding first rotating wheel 6 is generally smaller than 360 degrees, and the rotating angle of the photovoltaic panel 3 is smaller than 360 degrees.

It is understood that "at least partially adjacent two first rope portions 8" means: it is not necessary, nor excluded, that all adjacent two first rope portions 8 (or each adjacent two first rope portions 8) have the above-mentioned properties. In particular in the present embodiment, the sum of the angles of wrap of one end of all adjacent two first rope portions 8 on the corresponding first reel 6 is less than 360 degrees, about 200 degrees.

The term "operating state" in any operating state "means a state of the photovoltaic device in normal use, excluding a state in maintenance, and even excluding a state in damage.

Further, in any operating state, the sum of the angles of the windings of the ends of at least partially adjacent second rope portions 9 on the corresponding second wheel 7 is also smaller than 360 degrees.

The rotation of the rotating shaft 2 can only realize the angle adjustment of the photovoltaic panel 3 in one direction, and cannot realize the simultaneous tracking of the longitude and latitude of the photovoltaic panel 3 to sunlight. In view of this, in another embodiment, the photovoltaic device is further provided with a second support, to which the first support 1 is connected in a rotatable manner about the first axis, the weight of the first support 1 being supported by the second support. Wherein the first axis is perpendicular to the rotation axis 2. In this way, each photovoltaic panel 3 can rotate around two mutually perpendicular rotation axes, and then real-time vertical tracking of the photovoltaic panel 3 to sunlight can be achieved. The rotation of the first bracket 1 on the second bracket is driven by another motor.

< embodiment two >

Fig. 6 to 8 show a partial structure of a photovoltaic device in the second embodiment of the present application, which has substantially the same structure as the photovoltaic device in the first embodiment, and it can be understood with reference to the description of the first embodiment, mainly differing in that:

in the present embodiment, two adjacent first rope portions 8 are integrally connected, and non-end portions of the integrally connected two first rope portions 8 are fixed to the corresponding first reel 6. Specifically, a clamping groove 601 is formed in the first rotating wheel 6, a clamping block 15 is arranged in the middle of the two first rope portions 8 which are integrally connected, and the clamping block 15 is clamped in the clamping groove 601, so that the two first rope portions 8 are fixedly connected with the first rotating wheel 6. Preferably, screws may also be provided to lock the latch 15 to the first wheel 6. Correspondingly, two adjacent second rope portions 9 are also integrally connected, the non-end positions of the integrally connected second rope portions 9 being fixed to the corresponding second wheel 7 by means of the similar structure described above.

The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, which is defined by the appended claims.

Claims

1. A photovoltaic device, comprising:

a first bracket;

characterized in that the transmission assembly comprises:

a plurality of second rope portions, wherein one second rope portion is respectively connected between every two adjacent second rotating wheels and between two second rotating wheels at the end part, and one end of each two adjacent second rope portions surrounds and is fixed to the corresponding second rotating wheel in the opposite direction; and

the reciprocating traction seat can reciprocate along the first direction under the drive of the driving device, one first rope portion is fixedly connected with the reciprocating traction seat, and the other second rope portion is fixedly connected with the reciprocating traction seat.

2. The photovoltaic device of claim 1, wherein the transmission assembly further comprises:

a screw rod seat fixed with the first bracket and

3. The photovoltaic device of claim 2, wherein the lead screw mount comprises two guide rods parallel to each other and extending in the first direction, the reciprocating traction mount being movably coupled to the two guide rods.

4. The photovoltaic device of claim 2, wherein the transmission assembly further comprises a plurality of first guide wheels and a plurality of second guide wheels rotatably coupled to the first bracket;

5. The photovoltaic device of claim 1, wherein the photovoltaic device comprises,

for the first rope portion fixedly connected with the reciprocating traction seat, it comprises a first sub-rope portion and a second sub-rope portion, one end of the first sub-rope portion is fixed to the reciprocating traction seat, the other end is wound around and fixed to a corresponding one of the first rotating wheels, one end of the second sub-rope portion is fixed to the reciprocating traction seat, and the other end is wound around and fixed to a corresponding other one of the first rotating wheels;

6. The photovoltaic device of claim 1, wherein the transmission assembly further comprises a plurality of first guide wheels and a plurality of second guide wheels rotatably connected to the first bracket, each of the first rope portions having both ends wound around and secured to the corresponding two first guide wheels, respectively, and each of the second rope portions having both ends wound around and secured to the corresponding two second guide wheels, respectively, each of the first rope portions extending in the first direction between the corresponding two first guide wheels, each of the second rope portions extending in the first direction between the corresponding two second guide wheels.

7. The photovoltaic device of claim 1, wherein the transmission assembly further comprises at least one first guide wheel and at least one second guide wheel rotatably coupled to the first bracket, each of the first guide wheels corresponding to a respective one of the first rotating wheels, each of the second guide wheels corresponding to a respective one of the second rotating wheels;

8. The photovoltaic device of claim 1, wherein the photovoltaic device comprises,

at least part of two adjacent first rope portions are integrally connected, and the non-end parts of the two integrally connected first rope portions are fixed on the corresponding first rotating wheels;

9. The photovoltaic device of claim 1, wherein the photovoltaic device comprises,

each first rope portion and each second rope portion are steel wire ropes;

10. The photovoltaic device according to claim 1, wherein in any operating condition the sum of the angles of wrap of one end of at least partially adjacent two of the first rope portions on the corresponding first wheel is less than 360 degrees and the sum of the angles of wrap of one end of at least partially adjacent two of the second rope portions on the corresponding second wheel is less than 360 degrees.