A photovoltaic bracket based on Roberts mechanism

Abstract

The present invention discloses a photovoltaic support based on Roberts mechanism, including a support mechanism, a connection mechanism, a transmission mechanism and a drive mechanism; the support mechanism includes two support frames symmetrically arranged in an eight-shaped shape; the support frame includes a base beam, a top beam and two inclined support columns; the two ends of the connection mechanism are respectively connected to the two top beams, and the connection mechanism is used to install solar photovoltaic panels; the drive mechanism includes a circular guide rail, a drive rod, a drive cable, a drive wheel, a first drive motor and a second drive motor, the circular guide rail is provided with two drive wheels, the drive cable is wound around the two drive wheels, and a connection point is provided on the drive cable; the transmission mechanism includes two first transmission rods and two second transmission rods. The present invention can not only realize the bidirectional tracking of the photovoltaic support and improve the utilization rate of solar energy, but also transform the single rotation into a combination of rotation and translation, optimize the aerodynamic performance of the photovoltaic support, and greatly improve the torsional stiffness of the photovoltaic support.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic bracket based on a Roberts mechanism. Background Art

[0002] Currently, energy and environmental issues have begun to attract people's attention, among which renewable energy has become the focus of attention. Solar energy has become the main content of the energy revolution in many countries with its advantages of abundant resources, safety, cleanliness and relatively low price.

[0003] Traditional tracking photovoltaic brackets are mostly flat single-axis. For the main axis, it is mainly subject to the pressure and torsion generated by the wind load, and for the column, it is mainly subject to the bending moment generated by the wind load. The most common form of damage to flat single-axis photovoltaic brackets is torsional aerodynamic instability. When the wind speed exceeds the critical wind speed, the bracket begins to vibrate in the first torsion mode. As the wind speed increases, the amplitude continues to increase until the bracket structure is damaged.

[0004] For a reliable photovoltaic support system, both power generation efficiency and aeroelastic effect must be taken into consideration. Power generation efficiency is closely related to its tracking form, and many unidirectional tracking photovoltaic supports are restricted by terrain factors. The aeroelastic effect mainly includes two aspects: structural strength and stability. In order to meet these two requirements and not seek changes in the original support form, manufacturers can only invest more materials to ensure that they are relatively "up to standard", which causes unnecessary waste and cannot fundamentally solve the problem. Summary of the invention

[0005] The purpose of the present invention is to provide a photovoltaic bracket based on the Roberts mechanism to solve the problems existing in the above-mentioned prior art. It can not only realize two-way tracking of the photovoltaic bracket and improve the utilization rate of solar energy, but also transform the single rotation into a combination of rotation and translation, thereby optimizing the aerodynamic performance of the photovoltaic bracket and greatly improving the torsional stiffness of the photovoltaic bracket.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a photovoltaic support based on Roberts mechanism, comprising a supporting mechanism, a connecting mechanism, a transmission mechanism and a driving mechanism;

[0008] The support mechanism comprises two support frames symmetrically arranged in an eight-shaped shape;

[0009] The support frame includes a base beam, a top beam and two oblique support columns, the base beam and the top beam are parallel to each other, the two oblique support columns are symmetrically arranged in an eight-shaped shape, the bottom ends and top ends of the two oblique support columns are rotatably connected to a connecting piece through a first rotating shaft, the two connecting pieces at the top ends are rotatably connected to the two ends of the top beam with the top beam as the rotating shaft, and the two connecting pieces at the bottom ends are rotatably connected to the two ends of the base beam with the base beam as the rotating shaft, and the first rotating shaft is perpendicular to the base beam;

[0010] The two ends of the connecting mechanism are respectively fixedly connected to the two top beams, and the connecting mechanism is used to install and fix the solar photovoltaic panel;

[0011] The driving mechanism comprises a circular guide rail, a driving rod, a driving cable, a driving wheel, a first driving motor and a second driving motor, the plane where the circular guide rail is located is parallel to the plane where the two foundation beams are located, the circular guide rail is provided with two driving wheels with an angle of 180°, the two driving wheels are respectively connected to the two ends of the driving rod, the driving cable is wound around the two driving wheels, and a connection point is provided on the driving cable between the two driving wheels, the first driving motor is used to drive the driving wheel to rotate on the circular guide rail to drive the connection point to move, and the second driving motor is used to drive the driving rod to rotate to drive the two driving wheels to move along the circular guide rail;

[0012] The transmission mechanism includes two first transmission rods of equal length fixedly connected in a V shape and two second transmission rods of equal length fixedly connected in a V shape; the two first transmission rods are symmetrically arranged with respect to a first center plane, the first center plane is the symmetrical center plane of the two support frames, the connected ends of the two first transmission rods are connected to the connection point, and the ends of the two first transmission rods away from the connection point are fixedly connected to the connection mechanism; the two second transmission rods are symmetrically arranged with respect to a second center plane, the second center plane is the symmetrical center plane of the two oblique support columns in one of the support frames, the connected ends of the two second transmission rods are connected to the connection point, and the ends of the two second transmission rods away from the connection point are fixedly connected to the connection mechanism.

[0013] Preferably, the connecting mechanism comprises a circular ring and a straight rod, two straight rods in a cross shape are fixedly arranged in the circular ring, and two ends of the circular ring are respectively fixedly connected to the two top beams.

[0014] Preferably, each of the driving wheels is provided with an annular groove, a slider is slidably provided in each of the annular grooves, and both ends of the driving rod are fixedly connected to the two sliders respectively.

[0015] Preferably, the driving mechanism also includes a driving support, the driving rod is a linear rod, the driving rod passes through the center of the circular guide rail, the driving support is fixedly connected to the middle position of the driving rod, the axis of the driving support is perpendicular to the plane where the circular guide rail is located and passes through the center of the circular guide rail, the second driving motor is transmission-connected to the driving support, and the second driving motor can drive the driving support to rotate to drive the driving rod to rotate, thereby driving the two driving wheels to move along the circular guide rail.

[0016] Preferably, the first drive motor is fixedly connected to the drive rod, and the first drive motor is drivingly connected to one of the drive wheels, so that the first drive motor can drive the drive wheel to rotate, and the drive cable can drive the other drive wheel to rotate.

[0017] Preferably, the first transmission rod and the second transmission rod are equal in length.

[0018] Preferably, the first transmission rod and the oblique support column are equal in length.

[0019] Preferably, mounting plates are fixedly provided at both ends of the inclined support column, and the first rotating shaft passes through the mounting plate and the connecting member to rotatably connect the mounting plate and the connecting member.

[0020] Preferably, the two first transmission rods are fixedly connected by welding and are fixedly connected to the circular ring, and the two second transmission rods are fixedly connected by welding and are fixedly connected to the circular ring.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The present invention provides a photovoltaic support based on the Roberts mechanism, wherein the positions of two driving wheels are adjusted by a second driving motor so that a driving cable is perpendicular to a base beam, and the driving wheel is driven to rotate by a first driving motor, thereby driving the driving cable to move, so that a connection point moves with the movement of the driving cable, and then the shape of the supporting mechanism is changed by a transmission mechanism and a connecting mechanism, thereby realizing the rotation and translation of a solar photovoltaic panel, thereby realizing the angle change to achieve the purpose of tracking; if two-way tracking is to be achieved, the solar photovoltaic panel needs to be restored to an initial state (horizontal), and the driving rod is driven to rotate 90° by a second driving motor, and the positions of the two driving wheels are adjusted so that the driving cable is parallel to the base beam, and the driving wheel is driven to rotate by the first driving motor again, so that the connection point moves with the movement of the driving cable, and then the shape of the supporting mechanism is changed by a transmission mechanism and a connecting mechanism, thereby realizing the rotation and translation of the solar photovoltaic panel, and thus two-way tracking can be achieved. The present invention not only realizes bidirectional tracking of the photovoltaic bracket and improves the utilization rate of solar energy, but also transforms a single rotation into a combination of rotation and translation, thereby optimizing the aerodynamic performance of the photovoltaic bracket, greatly improving the torsional stiffness of the photovoltaic bracket, and saving raw materials, and can adapt to a variety of application scenarios (on land and water, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only 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.

[0024] Figure 1 A schematic diagram of the structure of a photovoltaic support based on the Roberts mechanism provided by the present invention;

[0025] Figure 2 A schematic diagram of the structure after a solar photovoltaic panel is installed on a photovoltaic support based on the Roberts mechanism provided by the present invention;

[0026] Figure 3 for Figure 1 A partial enlarged schematic diagram of part A;

[0027] Figure 4 It is a structural schematic diagram of the support mechanism in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the driving mechanism in the present invention;

[0029] Figure 6 for Figure 5 A partial enlarged schematic diagram of part B;

[0030] Figure 7 It is a structural schematic diagram of the connecting mechanism in the present invention;

[0031] Figure 8 A cross-sectional view of the connection structure between the driving rod and the driving wheel in the present invention;

[0032] In the figure: 1-support mechanism, 2-connecting mechanism, 3-transmission mechanism, 4-driving mechanism, 5-support frame, 6-foundation beam, 7-top beam, 8-inclined support column, 9-first rotating shaft, 10-connecting piece, 11-solar photovoltaic panel, 12-circular guide rail, 13-driving rod, 14-driving cable, 15-driving wheel, 16-connecting point, 17-first transmission rod, 18-second transmission rod, 19-circular ring, 20-straight rod, 21-annular groove, 22-slider, 23-driving support, 24-mounting plate, 25-connecting rod, 26-first driving motor, 27-second driving motor, 28-screw, 29-screw nut, 30-connecting rod. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a photovoltaic bracket based on the Roberts mechanism to solve the problems existing in the prior art. It can not only realize two-way tracking of the photovoltaic bracket and improve the utilization rate of solar energy, but also transform the single rotation into a combination of rotation and translation, thereby optimizing the aerodynamic performance of the photovoltaic bracket and greatly improving the torsional stiffness of the photovoltaic bracket.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1-Figure 8 As shown, this embodiment provides a photovoltaic support based on the Roberts mechanism, including a supporting mechanism 1, a connecting mechanism 2, a transmission mechanism 3 and a driving mechanism 4;

[0037] The support mechanism 1 comprises two support frames 5 symmetrically arranged in an eight-shaped shape;

[0038] The support frame 5 includes a base beam 6, a top beam 7 and two oblique support columns 8. The base beam 6 and the top beam 7 are parallel to each other. The two oblique support columns 8 are symmetrically arranged in an eight-shaped shape. The bottom and top ends of the two oblique support columns 8 are rotatably connected to a connecting member 10 through a first rotating shaft 9. The two connecting members 10 at the top are rotatably connected to the two ends of the top beam 7 with the top beam 7 as the rotating shaft, and the two connecting members 10 at the bottom are rotatably connected to the two ends of the base beam 6 with the base beam 6 as the rotating shaft. The first rotating shaft 9 is perpendicular to the base beam 6;

[0039] The two ends of the connection mechanism 2 are respectively fixedly connected to the two top beams 7, and the connection mechanism 2 is used to install and fix the solar photovoltaic panel 11;

[0040] The driving mechanism 4 includes a circular guide rail 12, a driving rod 13, a driving cable 14, a driving wheel 15, a first driving motor 26 and a second driving motor 27. The plane where the circular guide rail 12 is located is parallel to the plane where the two foundation beams 6 are located. The circular guide rail 12 is provided with two driving wheels 15 with an angle of 180°. The two driving wheels 15 are respectively connected to the two ends of the driving rod 13. The driving cable 14 is wound around the two driving wheels 15. The driving cable 14 between the two driving wheels 15 is provided with a connection point 16. The first driving motor 26 is used to drive the driving wheel 15 to rotate on the circular guide rail 12 to drive the connection point 16 to move. The second driving motor 27 is used to drive the driving rod 13 to rotate to drive the two driving wheels 15 to move along the circular guide rail 12.

[0041] The transmission mechanism 3 includes two first transmission rods 17 of equal length fixedly connected in a V shape and two second transmission rods 18 of equal length fixedly connected in a V shape; the two first transmission rods 17 are symmetrically arranged about the first center plane, the first center plane is the symmetrical center plane of the two support frames 5, the connected ends of the two first transmission rods 17 are connected to the connection point 16, and the ends of the two first transmission rods 17 away from the connection point 16 are fixedly connected to the connection mechanism 2; the two second transmission rods 18 are symmetrically arranged about the second center plane, the second center plane is the symmetrical center plane of the two oblique support columns 8 in a support frame 5, the connected ends of the two second transmission rods 18 are connected to the connection point 16, and the ends of the two second transmission rods 18 away from the connection point 16 are fixedly connected to the connection mechanism 2.

[0042] The present invention is based on the principle of Roberts linear mechanism, that is, the trajectory swept by the connection between the drive cable 14 and the transmission mechanism 3 (i.e., the connection point 16) is a straight line each time unidirectional tracking is performed. The Roberts mechanism is not a linear mechanism in the strict sense, but is only an approximate linear mechanism (the deviation of its trajectory from the straight line is extremely small). The present invention adopts a cable with flexible characteristics (steel cable can be selected) for transmission, which can fully meet the extremely small deviation of its motion trajectory.

[0043] When in use, the solar photovoltaic panel 11 is installed and fixed on the connecting mechanism 2. The default solar photovoltaic panel 11 is horizontal as the initial state. The positions of the two driving wheels 15 are adjusted by the second driving motor 27 to make the driving cable 14 perpendicular to the foundation beam 6. The driving wheel 15 is driven by the first driving motor 26 to rotate, thereby driving the driving cable 14 to move, so that the connection point 16 moves with the movement of the driving cable 14, and then through the transmission mechanism 3 and the connecting mechanism 2, the shape of the supporting mechanism 1 is changed (the angle between the inclined support column 8 and the horizontal plane changes), thereby realizing the rotation and translation of the solar photovoltaic panel 11, thereby realizing the angle change to achieve the purpose of tracking. The above is one-way tracking. If you want to achieve two-way tracking, you need to restore the solar photovoltaic panel 11 to its initial state (horizontal), drive the drive rod 13 to rotate 90° through the second drive motor 27, adjust the positions of the two drive wheels 15, make the drive cable 14 parallel to the foundation beam 6, and drive the drive wheel 15 to rotate again through the first drive motor 26, so that the connection point 16 moves with the movement of the drive cable 14, and then through the transmission mechanism 3 and the connection mechanism 2, the shape of the support mechanism 1 is changed, thereby realizing the rotation and translation of the solar photovoltaic panel 11, and realizing two-way tracking.

[0044] In this embodiment, the connection mechanism 2 includes a ring 19 and a straight rod 20. Two cross-shaped straight rods 20 are fixedly arranged in the ring 19. The two ends of the ring 19 are respectively fixedly connected to the two top beams 7. The two straight rods 20 pass through the center of the ring 19, making the connection mechanism 2 more stable and less prone to deformation.

[0045] In this embodiment, each driving wheel 15 is provided with an annular groove 21, and a slider 22 is slidably provided in each annular groove 21, and the two ends of the driving rod 13 are fixedly connected to the two sliders. When the driving wheel 15 rotates, the slider 22 can slide relatively in the annular groove 21, and the annular groove 21 can adopt a constricted groove to limit the slider 22 and prevent the slider 22 from falling off from the annular groove 21, so that the two driving wheels 15 can be driven to move along the circular guide rail 12 by rotating the driving rod 13, so as to achieve the purpose of adjusting the position of the two driving wheels 15. The slider 22 can be set as a sphere so that the slider 22 can slide easily relative to the driving wheel 15, and the sphere is connected to the driving rod 13 through a connecting rod 25.

[0046] In this embodiment, the driving mechanism 4 also includes a driving support 23, the driving rod 13 is a linear rod, the driving rod 13 passes through the center of the circular guide rail 12, the driving support 23 is fixedly connected to the middle position of the driving rod 13, the axis of the driving support 23 is perpendicular to the plane where the circular guide rail 12 is located and passes through the center of the circular guide rail 12, and the second driving motor 27 is connected to the driving support 23 by transmission, preferably a gear transmission connection. The second driving motor 27 can drive the driving support 23 to rotate to drive the driving rod 13 to rotate, thereby driving the two driving wheels 15 to move along the circular guide rail 12.

[0047] In this embodiment, the first drive motor 26 is fixedly connected to the drive rod 13, and the output shaft of the first drive motor 26 is connected to one end of the lead screw 28, and the other end of the lead screw 28 is rotatably connected to the drive rod 13 through a bearing seat. A lead screw nut 29 is threadedly connected to the lead screw 28, and the lead screw nut 29 is connected to the drive cable 14 through a connecting rod 30. The lead screw 28 is driven to rotate by the first drive motor 26, thereby driving the lead screw nut 29 to move along the lead screw 28, and then driving the drive cable 14 to move, so that the two drive wheels 15 rotate. In order to ensure that the lead screw nut 29 can translate along the lead screw 28, a guide rod (not shown in the figure) can be fixedly set on the drive rod 13, and the lead screw nut 29 is slidably connected to the guide rod, and the lead screw nut 29 is limited from rotating by the guide rod.

[0048] In this embodiment, the lengths of the first transmission rod 17 and the second transmission rod 18 are equal, and the lengths of the first transmission rod 17 and the oblique support column 8 are equal, which is convenient for manufacturing.

[0049] In this embodiment, mounting plates 24 are fixedly provided at both ends of the inclined support column 8 , and the first rotating shaft 9 passes through the mounting plate 24 and the connecting member 10 to rotatably connect the mounting plate 24 and the connecting member 10 .

[0050] In this embodiment, the two first transmission rods 17 are welded and fixedly connected and are welded and fixedly connected to the ring 19, and the two second transmission rods 18 are welded and fixedly connected and are welded and fixedly connected to the ring 19. The welding method is convenient and fast to manufacture and the connection is reliable.

[0051] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A photovoltaic support based on Roberts mechanism, characterized in that: It includes a supporting mechanism, a connecting mechanism, a transmission mechanism and a driving mechanism; The support mechanism comprises two support frames symmetrically arranged in an eight-shaped shape; The support frame includes a base beam, a top beam and two oblique support columns, the base beam and the top beam are parallel to each other, the two oblique support columns are symmetrically arranged in an eight-shaped shape, the bottom ends and top ends of the two oblique support columns are rotatably connected to a connecting piece through a first rotating shaft, the two connecting pieces at the top ends are rotatably connected to the two ends of the top beam with the top beam as the rotating shaft, and the two connecting pieces at the bottom ends are rotatably connected to the two ends of the base beam with the base beam as the rotating shaft, and the first rotating shaft is perpendicular to the base beam; The two ends of the connecting mechanism are respectively fixedly connected to the two top beams, and the connecting mechanism is used to install and fix the solar photovoltaic panel; The driving mechanism comprises a circular guide rail, a driving rod, a driving cable, a driving wheel, a first driving motor and a second driving motor, the plane where the circular guide rail is located is parallel to the plane where the two foundation beams are located, the circular guide rail is provided with two driving wheels with an angle of 180°, the two driving wheels are respectively connected to the two ends of the driving rod, the driving cable is wound around the two driving wheels, and a connection point is provided on the driving cable between the two driving wheels, the first driving motor is used to drive the driving wheel to rotate on the circular guide rail to drive the connection point to move, and the second driving motor is used to drive the driving rod to rotate to drive the two driving wheels to move along the circular guide rail; The transmission mechanism includes two first transmission rods of equal length fixedly connected in a V shape and two second transmission rods of equal length fixedly connected in a V shape; the two first transmission rods are symmetrically arranged with respect to a first center plane, the first center plane is the symmetrical center plane of the two support frames, the connected ends of the two first transmission rods are connected to the connection point, and the ends of the two first transmission rods away from the connection point are fixedly connected to the connection mechanism; the two second transmission rods are symmetrically arranged with respect to a second center plane, the second center plane is the symmetrical center plane of the two oblique support columns in one of the support frames, the connected ends of the two second transmission rods are connected to the connection point, and the ends of the two second transmission rods away from the connection point are fixedly connected to the connection mechanism.

2. The photovoltaic support based on the Roberts mechanism according to claim 1, characterized in that: The connecting mechanism comprises a circular ring and a straight rod. Two cross-shaped straight rods are fixedly arranged in the circular ring. Two ends of the circular ring are respectively fixedly connected to the two top beams.

3. The photovoltaic support based on the Roberts mechanism according to claim 1, characterized in that: Each of the driving wheels is provided with an annular groove, and a sliding block is slidably provided in each of the annular grooves, and the two ends of the driving rod are respectively fixedly connected to the two sliding blocks.

4. The photovoltaic support based on the Roberts mechanism according to claim 1, characterized in that: The driving mechanism also includes a driving support, the driving rod is a linear rod, the driving rod passes through the center of the circular guide rail, the driving support is fixedly connected to the middle position of the driving rod, the axis of the driving support is perpendicular to the plane where the circular guide rail is located and passes through the center of the circular guide rail, the second driving motor is transmission-connected to the driving support, and the second driving motor can drive the driving support to rotate to drive the driving rod to rotate, thereby driving the two driving wheels to move along the circular guide rail.

5. The photovoltaic support based on the Roberts mechanism according to claim 1, characterized in that: The first drive motor is fixedly connected to the drive rod, and the first drive motor is drivingly connected to one of the drive wheels. The first drive motor can drive the drive wheel to rotate, and the drive cable can drive the other drive wheel to rotate.

6. The photovoltaic support based on the Roberts mechanism according to claim 1, characterized in that: The first transmission rod and the second transmission rod have the same length.

7. The photovoltaic support based on the Roberts mechanism according to claim 6, characterized in that: The first transmission rod and the oblique support column are equal in length.

8. The photovoltaic support based on the Roberts mechanism according to claim 1, characterized in that: Mounting plates are fixedly provided at both ends of the inclined support column, and the first rotating shaft passes through the mounting plate and the connecting member to rotatably connect the mounting plate and the connecting member.

9. The photovoltaic support based on the Roberts mechanism according to claim 2, characterized in that: The two first transmission rods are fixedly connected by welding and are also fixedly connected to the circular ring, and the two second transmission rods are fixedly connected by welding and are also fixedly connected to the circular ring.

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