Active locking chain type wind resistance device for photovoltaic tracking support

Abstract

The present invention discloses an active locking type chain wind resistance device for a photovoltaic tracking bracket. To solve the problems of driving and protection of the rotating shaft of a single-axis photovoltaic tracking bracket under the action of strong winds, one or more sets of active locking chain wind resistance devices are installed on the rotating shaft of the single-axis photovoltaic tracking bracket. In the wind resistance protection working mode, the chain wind resistance device pulls the end of the brake rod towards the corresponding lower pole point of the chain wind resistance device by means of periodically vibrating due to wind force and unidirectionally recovering the length of the chain, thereby enabling the photovoltaic tracking bracket to automatically operate to the wind resistance protection angle with a reduced windward area and maintain at this position. The beneficial feature of the present invention is that, by means of the chain unidirectional active locking device and the brake rod structure, the photovoltaic tracking bracket can reach the wind resistance protection state by means of wind force, simplifying the structure of the wind resistance device of the photovoltaic bracket and reducing the cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar tracking, and relates to an active locking chain type wind resistance device for a photovoltaic tracking bracket. Background Art

[0002] By automatically adjusting the working angle, a photovoltaic tracking bracket can make the photovoltaic panels carried thereon face the sun direction as much as possible, enabling the panels to fully receive solar radiation energy, thereby increasing the power generation.

[0003] A photovoltaic tracking bracket with only one rotation axis is called a single-axis photovoltaic tracking bracket, and this kind of tracking bracket only tracks the change of the solar azimuth angle or the pitch angle. The single-axis photovoltaic tracking bracket usually has a slender rotation axis, and then photovoltaic panels are installed on the rotation axis to track the sun's movement.

[0004] The longer the rotation axis of the single-axis photovoltaic tracking bracket and the larger the area of the photovoltaic panels carried per unit length of the rotation axis, the higher the investment return rate of the tracking bracket. Therefore, increasing the length of the rotation axis as much as possible and expanding the width of the carried panels are the main directions of the development of single-axis photovoltaic tracking bracket technology.

[0005] As the width of the tracking bracket increases, the lever arm of the wind load increases and the torque increases; as the length of the tracking bracket increases, the cumulative wind load deformation along the length direction of the rotation axis also becomes larger. Therefore, the wind dynamic load has exceeded the gravity load of the photovoltaic tracking bracket itself and has become the main load to be considered in the design of the single-axis photovoltaic tracking bracket.

[0006] The tracking action of the single-axis photovoltaic tracking bracket is realized by controlling an electric rotary drive installed on the rotation axis through a signal output by a photovoltaic bracket controller. The photovoltaic tracking bracket has a "normal tracking working mode" and a "wind resistance protection working mode". In the normal tracking working mode, the photovoltaic bracket controller calculates the working angle of the rotation axis according to the solar movement law, and then controls the electric rotation axis to reach the target tracking angle to achieve the tracking action. In the wind resistance protection working mode, the photovoltaic tracking bracket no longer tracks the sun's movement, but the tracking controller controls the electric rotary drive to reduce the angle between the photovoltaic panel and the ground, thereby reducing the windward area of the panel to avoid wind load damage, and finally reaching and stopping at the most favorable wind resistance protection angle.

[0007] The wind resistance protection angle of the photovoltaic tracking bracket is usually 0 degrees when the panel is parallel to the ground, but depending on the structure of the photovoltaic bracket, the wind resistance protection angle can also be a small deviation angle, such as a wind resistance protection state where the photovoltaic panel is at a 5-degree angle to the ground.

[0008] The electric rotary drive of the photovoltaic tracking bracket itself has the ability to lock at any angle. When the rotation stops, it can lock the angle of the rotation axis of the photovoltaic tracking bracket connected to it. However, due to the long rotation axis and elastic deformation, the rotation axes extending outward from both sides of the rotary drive form an elastic torsion beam structure. The longer the rotation axis, the greater the cumulative elastic deformation at its distal end. Under the action of wind load, the air on both sides of the photovoltaic panel will alternately form a vortex effect, causing the rotation axis of the single-axis photovoltaic tracking bracket to bear the periodic positive and negative torques input by the panel, thereby causing the periodic positive and negative oscillations of the rotation axes on both sides of the rotary drive.

[0009] As the size of the photovoltaic panel continues to increase, the periodic positive and negative torques input by the wind load on the rotation axis also become larger. The increase in the length of the rotation axis also leads to an increase in the amplitude of the elastic oscillation of the wind load along the axis direction. The large-amplitude elastic oscillation of the rotation axis of the single-axis photovoltaic tracking bracket will damage the photovoltaic panel it bears, causing hidden cracks in the battery cells and affecting the power generation. In severe cases, it will directly damage the mechanical structure of the single-axis photovoltaic tracking bracket, causing huge losses.

[0010] At present, the methods to solve the wind load elastic oscillation of the rotation axis of the single-axis photovoltaic tracking bracket mainly include the damper method and the multi-point synchronous drive method.

[0011] The so-called damper method, its technical solution is to install multiple dampers along the length direction on the rotation axis of the single-axis photovoltaic tracking bracket. When the rotation axis of the photovoltaic tracking bracket oscillates due to wind load, it drives the dampers to move, and the damping force of the dampers consumes the input energy of the wind vibration, achieving the purpose of suppressing the oscillation amplitude of the rotation axis.

[0012] The advantages of the damper technology are simple and easy to implement with low cost. The problems it has are:

[0013] 1. The damper can only reduce the oscillation amplitude and cannot completely prevent the occurrence of oscillation. The panels on the single-axis tracking bracket will still have the risk of forming hidden cracks due to the movement and distortion.

[0014] 2. It is not easy to select the damping force. If the damping force is too large, it will affect the normal rotation of the tracking bracket. If the damping force is too small, the wind resistance effect is relatively poor.

[0015] 3. When the photovoltaic tracking bracket runs from a large working angle to the wind resistance angle, the rotation axis needs to transmit the complete wind resistance running torque, resulting in high requirements for the strength of the rotation axis and high manufacturing cost.

[0016] The so-called multi-point synchronous drive method, its technical solution is to install multiple drives distributed along the length direction on the rotation axis of the single-axis photovoltaic tracking bracket. Multiple drives act together to drive the rotation axis to rotate. Once the action stops, multiple drive points are locked simultaneously, prohibiting the oscillation of the rotation axis from multiple points, improving the wind resistance stiffness of the entire main shaft, and protecting the safety of the bracket and the panel.

[0017] However, the existing problems are as follows:

[0018] 1. Installing multiple rotary drives also requires maintaining synchronous actions, resulting in a complex structure and high failure rate of the entire photovoltaic tracking bracket control and drive system.

[0019] 2. Multiple rotary drives jointly output a powerful torque to overcome the wind load and rotate the bracket back to the optimal wind-resistant angle in strong winds, resulting in a significant increase in the manufacturing cost of the drive system. Summary of the Invention

[0020] The object of the present invention is to provide an active locking chain type wind-resistant device for a photovoltaic tracking bracket. After the photovoltaic tracking bracket enters the wind-resistant mode, the device actively locks the rotation axis unidirectionally, enabling the photovoltaic bracket to move unidirectionally to the optimal wind-resistant angle under the action of wind load.

[0021] The technical solution adopted by the present invention is that an active locking chain type wind-resistant device for a photovoltaic tracking bracket includes a rotating mechanism with a one-way locking function. When braking is applied through an electrical signal, the rotating mechanism can only rotate in one direction, and the other direction is braked; when the braking is released through an electrical signal, the rotating mechanism resumes the ability to rotate bidirectionally; the rotating mechanism is coaxially connected with a transmission mechanism. After the photovoltaic tracking bracket enters the wind-resistant mode, the rotating mechanism actively locks the rotation axis unidirectionally, enabling the photovoltaic bracket to move unidirectionally to the optimal wind-resistant angle under the action of wind load.

[0022] The characteristics of the present invention also lie in:

[0023] The rotating mechanism includes a one-way flywheel. A linkage shaft is coaxially sleeved at the center of the one-way flywheel. One end of the linkage shaft is connected to the one-way flywheel, and the other end of the linkage shaft is coaxially sleeved with a brake wheel. An electric locking device is cooperatively connected to the brake wheel;

[0024] The transmission mechanism includes a transmission sprocket. The outer wall of the one-way flywheel is coaxially connected to the transmission sprocket, and the transmission sprocket is engaged with a transmission chain. When the transmission chain is pulled, it will drive the transmission sprocket to rotate synchronously.

[0025] In the rotating mechanism, when the transmission chain is pulled upward under an external force, the transmission sprocket engaged with the transmission chain rotates clockwise, and the linkage shaft and the brake wheel rotate coaxially with the transmission sprocket; at this time, the electric locking device can either lock the rotation of the brake wheel under the control of an electrical signal to prohibit the transmission chain from being pulled upward; or the electric locking device can, under the control of an electrical signal, release the brake to allow the rotation of the brake wheel, thereby allowing the transmission chain to be pulled upward;

[0026] When the transmission chain is retracted downward under the action of an external force, it drives the transmission sprocket to rotate in the reverse direction. When rotating in the reverse direction, the one-way flywheel disengages the connection between the transmission sprocket, the linkage shaft, and the brake wheel, and the transmission sprocket rotates freely.

[0027] The photovoltaic tracking bracket includes a support column. The upper end of the support column is installed with a rotating shaft through a bearing. The support column is connected to the outer ring of the bearing, and the rotating shaft is coaxially sleeved on the inner ring of the bearing; a photovoltaic panel is installed on the upper part of the rotating shaft, and a brake rod is installed on the lower part of the rotating shaft; the upper end of the brake rod is connected to the rotating shaft, the lower end of the brake rod is connected to the upper end of the transmission chain, the middle part of the transmission chain meshes with the transmission sprocket, and the lower end of the transmission chain is connected with a tension control mechanism, which applies a continuous downward pulling force to the transmission chain at the lower part of the transmission chain.

[0028] Set the brake rod to be vertically downward. When the position of the connection point between the transmission chain and the brake rod is at the lowest, the deflection angle of the rotating shaft is the optimal wind resistance angle; when the tracking bracket is at the optimal wind resistance angle, the photovoltaic panel is parallel to the ground, and at this time the brake rod is perpendicular to the photovoltaic panel.

[0029] When the rotating shaft drives the photovoltaic panel to deflect to both sides, the end position of the brake rod is raised, the transmission chain is pulled upward, and the transmission sprocket is driven to rotate clockwise; when the rotating shaft drives the photovoltaic panel to rotate in the direction of decreasing angle, the end position of the brake rod is lowered, and the transmission chain is automatically retracted downward under the drive of the tension control mechanism, driving the transmission sprocket to rotate counterclockwise; when the brake rod rotates to the end connected to the transmission chain at the lowest position, the transmission chain is in the limit retraction state, and this state corresponds to the wind resistance protection angle of the photovoltaic tracking bracket.

[0030] The rotation mechanism includes a linkage shaft. One end of the linkage shaft is coaxially sleeved with a brake ratchet. The brake ratchet cooperates with one end of the brake pawl. The other end of the brake pawl is connected with an electric pawl driver. A pawl spring is also connected to the brake pawl. One end of the pawl spring is connected to the brake pawl, and the other end of the pawl spring is connected to the support platform.

[0031] The transmission mechanism includes a transmission sprocket. The other end of the linkage shaft is connected to the transmission sprocket. The transmission chain meshes with the transmission sprocket. When the transmission chain is pulled, it will drive the transmission sprocket to rotate; at the same time, the transmission sprocket drives the brake ratchet to rotate through the linkage shaft.

[0032] When the rotation mechanism releases the one-way brake, the electric pawl driver overcomes the tension of the pawl spring to lift the brake pawl, so that the brake pawl is disengaged from the brake ratchet. The connected brake ratchet, linkage shaft, and transmission sprocket can rotate freely, and the transmission chain meshing with the brake ratchet can be pulled upward or retracted downward.

[0033] When the rotation mechanism applies a one-way brake, the electric pawl driver relaxes the angular restriction on the brake pawl. Under the pulling force of the pawl spring, the brake pawl contacts the brake ratchet. When the drive sprocket rotates in the positive direction, the linkage shaft and the brake ratchet follow the rotation. The brake pawl in contact with the brake ratchet presses against the tooth groove part of the brake ratchet to prohibit the rotation of the brake ratchet, and at the same time restricts the rotation of the drive sprocket and the upward extraction of the drive chain. During one-way braking, if the drive sprocket rotates in the reverse direction, the linkage shaft and the brake ratchet follow the rotation. The brake pawl in contact with the brake ratchet is lifted by the tooth back on the ratchet, and the rotation of the brake ratchet and the drive sprocket is not restricted, and the drive chain can be retracted downward.

[0034] The rotation mechanism includes a one-way bearing. A linkage inner shaft is coaxially sleeved at the center of the one-way bearing. A hollow linkage outer shaft is coaxially sleeved on the outer wall of the one-way bearing. A brake wheel is coaxially sleeved at one end of the linkage outer shaft, and an electric lock is connected to the brake wheel in a matching manner.

[0035] The transmission mechanism includes a transmission cable pulley. The other end of the linkage outer shaft is fixedly connected and rotated coaxially with the transmission cable pulley. The transmission cable is wound around the transmission cable pulley. When the transmission cable is pulled upward, it will drive the transmission cable pulley to rotate in the positive direction. At the same time, the transmission cable pulley drives the brake wheel to rotate through the linkage inner shaft, the one-way bearing, and the linkage outer shaft in sequence.

[0036] A tensioning cable is also wound around the transmission cable pulley. The winding directions of the transmission cable and the tensioning cable are opposite. A tension control mechanism is connected to the lower part of the tensioning cable. The tension control mechanism applies a continuous reverse torque to the transmission cable pulley and the linkage inner shaft through the tensioning cable. This torque is used to maintain the tension state of the transmission cable. Once the transmission is slack, the extra cable length will be automatically wound onto the transmission cable pulley.

[0037] The one-way bearing includes a one-way bearing outer ring and a one-way bearing inner ring. The one-way bearing outer ring is connected to the brake wheel through the linkage outer shaft. The one-way bearing inner ring is connected to the transmission cable pulley through the linkage inner shaft. One-way needle rollers are arranged between the one-way bearing outer ring and the one-way bearing inner ring. Due to the one-way action of the one-way needle rollers, when the one-way bearing inner ring rotates in the positive direction with the linkage inner shaft, it is locked and rotates together with the one-way bearing outer ring. When the one-way bearing inner ring rotates in the reverse direction with the linkage inner shaft, it is disconnected from the one-way bearing outer ring and rotates independently.

[0038] The electric lock locks or releases the rotation of the brake wheel under the control of an electric signal. When the electric lock is released, the transmission cable can be freely pulled out or reversed and wound by the transmission cable pulley after being slack. When the electric lock is locked, the brake wheel restricts the positive rotation of the transmission cable pulley through the linkage outer shaft, the one-way bearing, and the linkage inner shaft, thereby restricting the outward pulling of the transmission cable.

[0039] The beneficial effects of the present invention are as follows: during the wind resistance protection process, the active locking chain-type wind resistance device applies a unidirectional braking torque to the rotating shaft through the braking rod. Through the unidirectional recovery of the chain, with the help of the wind force, the rotating shaft of the photovoltaic tracking bracket is locked to the optimal wind resistance angle. The entire wind resistance protection system has the significant advantages of simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural view of the active locking chain-type wind resistance device for the photovoltaic tracking bracket of the present invention;

[0041] Figure 2 is a schematic structural view of the one-way flywheel in the active locking chain-type wind resistance device for the photovoltaic tracking bracket of the present invention;

[0042] Figure 3 is a front view of the installation structure of the active locking chain-type wind resistance device for the photovoltaic tracking bracket of the present invention;

[0043] Figure 4 is a side view schematic diagram of the installation structure of the active locking chain-type wind resistance device for the photovoltaic tracking bracket of the present invention;

[0044] Figure 5 is a mechanical installation schematic diagram of multiple groups of the active locking chain-type wind resistance devices for the photovoltaic tracking bracket of the present invention on a single-axis tracking bracket;

[0045] Figure 6 is a logical schematic diagram of multiple groups of the active locking chain-type wind resistance devices for the photovoltaic tracking bracket of the present invention on a single-axis tracking bracket;

[0046] Figure 7 is a state schematic diagram of the pawl closing and the ratchet moving unidirectionally in the active locking chain-type wind resistance device for the photovoltaic tracking bracket of the present invention;

[0047] Figure 8 is a state schematic diagram of the pawl being electrically opened and the ratchet moving freely in the active locking chain-type wind resistance device for the photovoltaic tracking bracket of the present invention;

[0048] Figure 9 is a schematic structural view of another form of the active locking chain-type wind resistance device for the photovoltaic tracking bracket of the present invention;

[0049] Figure 10 is Figure 9 a schematic structural view of the one-way bearing in

[0050] In the figures, 1. drive chain, 2. drive sprocket, 3. one-way flywheel, 4. linkage shaft, 5. brake wheel, 6. electric lock, 7. tension control mechanism;

[0051] 8. Photovoltaic tracking support, 801. Rotating shaft, 802. Support column, 803. Bearing, 804. Brake lever, 805. Photovoltaic panel, 806. Tracking controller, 807. Rotating drive;

[0052] 9. Guide wheel, 10. Active locking chain type wind resistance device, 11. Brake ratchet, 12. Brake pawl, 13. Pawl spring, 14. Electric pawl drive, 15. Support platform;

[0053] 21. Transmission cable, 22. Transmission cable wheel, 23. One-way bearing, 24. Linkage inner shaft, 25. Linkage outer shaft, 26. Tensioning cable, 27. One-way bearing outer ring, 28. One-way bearing inner ring, 29. One-way bearing needle roller. Detailed implementation mode

[0054] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0055] The active locking type chain wind resistance device for the photovoltaic tracking support of the present invention has a structure including a rotating mechanism with a one-way locking function. When braking is applied through an electrical signal, the rotating mechanism can only rotate in one direction, and the other direction is braked. When the braking is released through an electrical signal, the rotating mechanism resumes the ability to rotate bidirectionally. The rotating mechanism is coaxially connected with a transmission sprocket, and the transmission sprocket is meshed and connected with a transmission chain. When the rotating mechanism releases the lock, the transmission chain can be retracted inward or released outward under the pull of an external force. When the rotating mechanism is locked, the rotating direction of releasing the transmission chain outward is braked, and the transmission chain can only be retracted unidirectionally and cannot be released outward.

[0056] As Figure 1 、 2 shown, the rotating mechanism is installed on the support platform 15. The rotating mechanism includes a transmission chain 1, a transmission sprocket 2, a one-way flywheel 3, a linkage shaft 4, a brake wheel 5 and an electric locking device 6. The transmission chain 1 is meshed with the transmission sprocket 2. When the transmission chain 1 is pulled, it will drive the transmission sprocket 2 to rotate. The transmission sprocket 2 is connected with the brake wheel 5 through the one-way flywheel 3 and the linkage shaft 4. Due to the existence of the one-way flywheel 3, when the transmission sprocket 2 rotates clockwise, the linkage shaft 4 and the brake wheel 5 rotate accordingly. When the transmission sprocket 2 rotates in the opposite direction, the linkage shaft 4 and the brake wheel 5 do not rotate accordingly. The electric locking device 6 can lock the rotation of the brake wheel 5 under the control of an electrical signal or release the restriction to allow the brake wheel 5 to rotate.

[0057] The controllable one-way braking function of the transmission chain 1 is as described below:

[0058] The driving sprocket 2 is connected to the brake wheel 5 through a one-way flywheel 3 and a linkage shaft 4. When the driving chain 1 is pulled upward under an external force, the driving sprocket 2 meshed with it rotates clockwise. When rotating clockwise, the linkage shaft 4 and the brake wheel 5 rotate coaxially with the driving sprocket 2. The electric lock 6 can lock the rotation of the brake wheel 5 under the control of an electric signal, thereby prohibiting the driving chain 1 from being pulled upward; the electric lock 6 can also release the brake and allow the rotation of the brake wheel 5 under the control of an electric signal, thereby allowing the driving chain 1 to be pulled upward.

[0059] When the driving chain 1 is retracted downward, it drives the driving sprocket 2 to rotate in the reverse direction. When rotating in the reverse direction, the one-way flywheel 3 disengages the connection between the driving sprocket 2, the linkage shaft 4, and the brake wheel 5, and the driving sprocket 2 rotates freely without being affected by the braking state of the electric lock 6.

[0060] As Figure 3 、 4 As shown, the upper end of the support column 802 of the photovoltaic tracking bracket 8 is installed with a rotating shaft 801 through a bearing 803. The upper part of the rotating shaft 801 is installed with a photovoltaic panel 805, and the lower part of the rotating shaft 801 is installed with a brake rod 804. The upper part of the brake rod 804 is fixedly connected to the rotating shaft 801, and the lower part of the brake rod 804 is connected to the upper end point of the driving chain 1. The middle part of the driving chain 1 meshes with the driving sprocket 2, and the lower part of the driving chain is connected with a tension control mechanism 7, which applies a continuous downward pulling force to the driving chain 1 at the lower part of the driving chain. Since the reverse rotation of the driving sprocket 2 is not affected by the brake wheel 5 and the electric lock 6, the tension control mechanism 7 can always keep the driving chain 1 in a tensioned state.

[0061] It is set that when the brake rod 804 is vertically downward and the deflection angle of the rotating shaft 801 when the connection point of the driving chain 1 and the brake rod 804 is at the lowest position is the optimal wind resistance angle. Usually, when the tracking bracket is at the optimal wind resistance angle, the photovoltaic panel 805 is parallel to the ground, and at this time, the brake rod 804 is perpendicular to the photovoltaic panel 805. However, according to different structural forms of the photovoltaic bracket, it can also be set that the photovoltaic panel 805 forms a preset included angle with the ground at the optimal wind resistance angle. In the present invention, the included angle between the battery panel 805 and the ground at the optimal wind resistance angle can be controlled by designing the connection angle between the brake rod 804 and the rotating shaft 801.

[0062] When the rotating shaft 801 drives the photovoltaic panel 805 to deflect to both sides, the end position of the brake lever 804 is elevated, the transmission chain 1 is pulled out upward, driving the transmission sprocket 2 to rotate in the positive direction. When the rotating shaft 801 drives the photovoltaic panel 805 to rotate in the direction of decreasing angle, the end position of the brake lever 804 is lowered, and the transmission chain 1 is automatically retracted downward under the drive of the tension control mechanism 7, driving the transmission sprocket 2 to rotate in the reverse direction. When the brake lever 804 rotates to the position where the end connecting the transmission chain is at the lowest position, the transmission chain 1 is in the limit retraction state, and this state corresponds to the wind resistance protection angle of the photovoltaic tracking bracket.

[0063] As Figure 1 , Figure 3 and Figure 4 shown, when the transmission chain 1 continuously changes the pulling direction following the movement of the end of the brake lever 804, the guide wheel 9 is used to guide the direction of the transmission chain 1 to prevent it from disengaging from the transmission sprocket 2.

[0064] As Figure 1 , Figure 3 and Figure 4 shown, when the electric lock 6 is released, the brake wheel 5 rotates freely, the transmission chain 1 can be freely pulled out upward or retracted downward, and the rotating shaft 801 can drive the photovoltaic panel 805 to rotate freely to track the sun's movement. When the electric lock 6 is locked, the brake wheel 5 is prohibited from rotating. Due to the existence of the one-way flywheel 3, the transmission chain 1 engaged with the transmission sprocket 2 can be retracted downward under the action of the tension control mechanism 7, but cannot be pulled out by the brake lever 804. Correspondingly, the rotating shaft 801 can only drive the photovoltaic panel 805 to move in the direction where the angle of the brake lever 804 decreases and the transmission chain 1 retracts downward. When the rotating shaft 801 rotates in the direction of increasing the angle of the brake lever 804, the transmission chain 1 that cannot be pulled out applies a braking force to the end of the brake lever 804 to prevent it from moving away.

[0065] As Figure 5 and Figure 6 shown, a tracking controller 806 is installed on the rotating shaft 801 of the single-axis photovoltaic tracking bracket 8, and a rotary drive 807 is also installed on the top of one of the support columns 802. The center of the rotary drive 807 is an output drive shaft that can rotate under the drive of a motor. The drive shaft of the rotary drive 807 is fixedly connected to the rotating shaft 801. When the rotary drive 807 is powered on and rotates, it can drive the rotating shaft 801 to rotate through the drive shaft. The single-axis photovoltaic tracking bracket is also equipped with one or more active locking type chain wind resistance devices 10.

[0066] When strong winds come, the tracking controller 806 of the photovoltaic tracking bracket obtains the information of wind speed exceeding the limit through the signal connection with the sub-array anemometer, so as to control the photovoltaic tracking bracket 8 to enter the wind resistance protection mode. In the wind protection mode, the tracking controller 806 outputs a signal to drive the rotary driver 807 to drive the rotary shaft 801 to operate towards the wind resistance protection angle that reduces the windward angle of the photovoltaic panel 805. At the same time, the tracking controller 806 sends a braking signal to the active locking chain type wind resistance device 10 installed on the same photovoltaic tracking bracket. After each active locking chain type wind resistance device 10 receives the braking signal, the electric lock 6 on it performs a locking operation to prevent the rotation of the brake wheel 5. After the active locking chain type wind resistance device 10 is locked, the transmission chain 1 can only be retracted inward under the action of the tension control mechanism 7 and cannot be pulled outwards by the brake rod 804.

[0067] During the operation of the wind resistance protection, the rotary driver 807 drives the end of the brake rod 804 to move towards the lowest position through the rotary shaft 801, and the transmission chain 1 is retracted downward. If during this process, the wind vibration causes the rotary shaft 801 to swing in the direction opposite to the wind resistance protection angle, the end of the brake rod 804 moves towards a higher position. However, since the transmission chain 1 is prevented from being pulled out by the active locking chain type wind resistance device 10, the tension of the transmission chain 1 applies a braking torque to the rotary shaft 801 through the brake rod 804 to prohibit its reverse rotation. If during the wind resistance protection operation, the wind vibration causes the rotary shaft 801 to swing in the same direction as the wind resistance protection angle, the end of the brake rod 804 moves towards a lower position, and the transmission chain 1 is retracted downward by the tension control mechanism 7 after being slackened. Since the transmission chain 1 cannot be pulled out after being retracted, the rotation angle of the section of the rotary shaft 801 where the active locking chain type wind resistance device 10 is installed will be ahead of the angle of the rotary driver 807 moving towards the optimal wind resistance position.

[0068] After the rotation angle of the rotary shaft 801 reaches the optimal wind resistance angle, the end of the brake rod 804 reaches the lowest position. No matter which direction the wind vibration torque causes the rotary shaft 801 to rotate, the transmission chain 1 that cannot be pulled out can apply a braking force to the end of the brake rod 804 to prohibit it from moving away. Therefore, the working angles of the rotary shaft 801 and the photovoltaic panel 805 are locked.

[0069] In the present invention, it is defined that when the transmission chain 1 is pulled out upwards, the transmission sprocket 2 rotates clockwise, and when it is retracted downwards, the transmission sprocket 2 rotates counterclockwise. By changing the installation direction of the one-way flywheel 3, the above-defined clockwise and counterclockwise directions can also be changed, but it does not affect the functions and features achieved by the present invention.

[0070] After the wind speed measured by the anemometer is lower than the set threshold value, the single-axis photovoltaic tracking bracket 8 resumes normal tracking operation. At this time, the tracking controller 806 of the photovoltaic tracking bracket sends a braking release signal to the active locking chain-type wind-resistant device 10 installed on the same photovoltaic tracking bracket. After each active locking chain-type wind-resistant device 10 receives the braking release signal, the electric lock 6 inside it performs the unlocking operation, the brake wheel 5 resumes free rotation, and the transmission chain 1 can be freely pulled out upward and retracted downward. The tracking controller 806 of the photovoltaic tracking bracket 8 can output a signal to drive the rotary driver 807 to drive the rotary shaft 801 and the photovoltaic panel 805 to move freely to track the sun's movement.

[0071] When the rotation mechanism is unlocked, the transmission chain can be retracted inward and can also be released outward under the pull of an external force. When the rotation mechanism is locked, the rotation direction of the transmission chain when released outward is braked, and the transmission chain can only be retracted unidirectionally and cannot be released outward.

[0072] There are simplified structures such as Figure 7 and Figure 8 As shown. In the simplified structure of the active locking chain-type wind-resistant device 10, the rotation mechanism with a one-way locking function is composed of a linkage shaft 4, a brake ratchet 11, a brake pawl 12, a pawl spring 13, and an electric pawl driver 14. The linkage shaft 4 is coaxially connected to the transmission sprocket 2 for rotation. The transmission chain 1 is engaged with the transmission sprocket 2. When the transmission chain 1 is pulled, it will drive the transmission sprocket 2 to rotate. At the same time, the transmission sprocket 2 drives the brake ratchet 11 to rotate through the linkage shaft 4.

[0073] When releasing the one-way brake, as Figure 8 shown, the electric pawl driver 14 overcomes the pulling force of the pawl spring 13 to lift the brake pawl 12, so that the brake pawl 12 is disengaged from the brake ratchet 11. The connected brake ratchet 11, linkage shaft 4, and transmission sprocket 2 can rotate freely, and the transmission chain 1 engaged with the brake ratchet 11 can be pulled out upward or retracted downward.

[0074] When applying one-way braking, as Figure 7 shown, the electric pawl driver 14 relaxes the angular restriction on the brake pawl 12. The brake pawl 12 contacts the brake ratchet 11 under the pulling force of the pawl spring 13. When the transmission sprocket 2 rotates in the positive direction, the linkage shaft 4 and the brake ratchet 11 follow the rotation. The brake pawl 12 in contact with the brake ratchet 11 presses against the tooth groove part of the brake ratchet 11 to prohibit its rotation, and at the same time, it also restricts the rotation of the transmission sprocket 2 and the upward extraction of the transmission chain 1. When applying one-way braking, if the transmission sprocket 2 rotates in the reverse direction, the linkage shaft 4 and the brake ratchet 11 follow the rotation. The brake pawl 12 in contact with the brake ratchet 11 is lifted by the tooth back on the ratchet, and the rotation of the brake ratchet 11 and the transmission sprocket 2 is not restricted, and the transmission chain 1 can be retracted downward.

[0075] The active locking chain-type wind resistance device 10 has a reinforcement structure as shown in Figure 9 In the reinforcement structure of the active locking type chain-type wind resistance device 10, the rotating mechanism with a one-way locking function is jointly composed of a one-way bearing 23, a linkage inner shaft 24, a linkage outer shaft 25, a brake wheel 5, and an electric lock 6. The linkage inner shaft 24 is coaxially and fixedly connected to the transmission cable wheel 22 for rotation. The transmission cable 21 is wound around the transmission cable wheel 22. When the transmission cable 21 is pulled upward, it will drive the transmission cable wheel 22 to rotate forward. At the same time, the transmission cable wheel 22 drives the brake wheel 5 to rotate through the linkage inner shaft 24, the one-way bearing 23, and the linkage outer shaft 25 in sequence.

[0076] A tensioning cable 26 is also wound around the transmission cable wheel 22. The winding direction of the transmission cable 21 is opposite to that of the tensioning cable 26. A tension control mechanism 7 is connected to the lower part of the tensioning cable 26. The tension control mechanism 7 applies a continuous reverse transmission torque to the transmission cable wheel 22 and the linkage inner shaft 24 fixedly connected thereto through the tensioning cable 26. This torque is used to maintain the tension state of the transmission cable 21. Once the transmission cable 21 is slack, the extra cable length will be automatically wound onto the transmission cable wheel 22.

[0077] This reinforcement structure uses a one-way bearing 23 with stronger bearing capacity and smaller return clearance instead of a one-way flywheel, and uses a transmission cable that does not require meshing instead of a transmission chain. As shown in Figure 9 and Figure 10 The outer ring 27 of the one-way bearing of the one-way bearing 23 is connected to the brake wheel 5 through the linkage outer shaft 25. The inner ring 28 of the one-way bearing of the one-way bearing 23 is connected to the transmission cable wheel 22 through the linkage inner shaft 24. A one-way needle roller 29 is arranged between the inner and outer rings of the one-way bearing 23. Due to the one-way action of the one-way needle roller 29, when the inner ring 28 of the one-way bearing rotates forward with the linkage inner shaft 24, it is locked with the outer ring 27 of the one-way bearing and rotates together. When the inner ring 28 of the one-way bearing rotates reversely with the linkage inner shaft 24, it is disconnected from the outer ring 27 of the one-way bearing and rotates independently.

[0078] The electric lock 6 can lock the rotation of the brake wheel 5 under the control of an electric signal, or release the restriction to allow the rotation of the brake wheel 5. When the electric lock 6 is released, the transmission cable 21 can be freely pulled out, or it can be reversely wound by the transmission cable wheel 22 after being slack. When the electric lock 6 is locked, the brake wheel 5 restricts the forward rotation of the transmission cable wheel 22 through the linkage outer shaft 25, the one-way bearing 23, and the linkage inner shaft 24, thus restricting the outward pulling of the transmission cable 21. Due to the reverse disconnection feature of the one-way bearing 23, the transmission cable 21 can still be reversely wound by the transmission cable wheel 22 after being slack.

[0079] Embodiment 1

[0080] This example is a horizontal single-axis photovoltaic tracking bracket. The size of the photovoltaic panels 805 in this horizontal single-axis bracket is approximately 2256 mm × 1000 mm, and it adopts a double-row vertical placement structure, that is, the long side (2256) of the panel is perpendicular to the main beam. The double-row panels are vertically placed on the rotating shaft 801. The rotating shaft uses a square tube with a size of 140 mm × 140 mm and a wall thickness of 3 mm. The rotating shaft 801 is installed on the support column 802 through bearings 803, and the rotating shaft 801 and the photovoltaic panels 805 supported by the support column 802 are driven by the rotation drive device 80) to perform solar tracking within the range of ±60° east-west.

[0081] The photovoltaic panels have different installation methods such as single-row vertical placement, double-row vertical placement, and double-row horizontal placement. These installation methods are all common methods of horizontal single-axis tracking brackets, and their structures are above the rotating main shaft. Therefore, the specific upper-layer installation method does not affect the technical method of locking the main rotating shaft of the present invention.

[0082] In this example, each set of horizontal single-axis trackers installs 4 battery panel strings, with 28 panels in each string, for a total of 112 photovoltaic panels (battery modules). The maximum east-west width of this set of brackets is 4532 mm, and the north-south length is 61200 mm. There are a total of 9 support columns 802. The support columns 802 are numbered from south to north. The 1st column is the southernmost column, and the 9th column is the northernmost column. The 5th column is in the middle of the tracking range, and an electric slewing drive is installed on it, so the 5th column is called the drive column. The average center distance between each column is 7650 mm, and the rotating shaft 801 on the two outermost support columns 802, the 1st and 9th columns, extends 2130 mm at each end.

[0083] In this example, a photovoltaic tracking controller 806 is installed on the rotating shaft 801 near the 5th support column 802 to control the rotation tracking of the photovoltaic panels 805. Two sets of active locking chain type wind-resistant devices 10 are installed on the 2nd column and the 8th support column 802 respectively, as Figure 1 , Figure 2 shown. The drive sprocket 2 in the active locking chain type wind-resistant device 10 meshes with the drive chain 1. The upper end of the drive chain 3 is connected to the brake lever 804, and the brake lever 804 is fixedly connected to the rotating shaft 801. The lower end of the drive chain 3 is connected to a tension control mechanism 7, and the tension control mechanism 7 applies a constant vertically downward tension.

[0084] In this example, the tension controller mechanism 7 is realized by using a counterweight suspended at the lower end of the drive chain 1. This counterweight applies a downward tension to the drive chain 1 under the action of gravity. When the weight of the counterweight remains unchanged, the tension it applies can also be kept constant.

[0085] In this example, the active locking chain type wind resistance device 10 uses the drive chain 1 as the transmission medium, the electric caliper disc as the electric lock 6, and the one-way flywheel 3 (built-in ratchet structure) as the one-way mechanism. As Figure 1 shown, the main structure of the chain type wind resistance device includes: drive chain 1, drive sprocket 2, one-way flywheel 3, linkage shaft 4, brake wheel 5, electric lock 6, guide wheel 9. The drive chain 1 and the drive sprocket 2 are always meshed together. The function of the guide wheel 9 is to ensure that when the brake lever 804 pulls the drive chain 1 to move up and down, the drive chain 1 will not disengage from the drive sprocket 2. The guide wheel 9 is installed on the support platform 15 through the guide wheel pin shaft and can rotate freely around the guide wheel pin shaft. The drive sprocket 2 and the one-way flywheel 3 adopt an integrated design, that is, a flywheel structure. The inner ring of the flywheel is fixedly connected to the front end of the linkage shaft 4, and the other end of the linkage shaft 4 is fixedly connected to the brake wheel 5. The linkage shaft 4 is sleeved on the support platform 15 through a polymer bearing and can rotate freely in the installation hole. The brake disc 5 is stuck between the two brake pads of the electric lock 6. The electric lock 6 is installed on the support platform 15, and the support platform 15 is installed on the corresponding column 802. The integrated flywheel mechanism is as Figure 1 shown on the right. The outer ring is a sprocket and can be meshed with the drive chain 1. A double-ratchet inner ratchet structure is designed in the middle. The ratchets are installed on the inner ring. When the inner ring of the flywheel is fixed, the outer ring sprocket of the flywheel mechanism can only perform a one-way movement of counterclockwise rotation.

[0086] The working principle of the active locking chain anti-wind device in this example is as follows: First, define the angle of the rotating shaft 801 when the photovoltaic panel 805 is horizontal as 0 degrees. When the photovoltaic panel 805 deflects to both sides and the included angle with the ground becomes larger, the deflection angle of the rotating shaft 801 increases. When the rotating shaft 801 rotates in the direction of increasing angle, the end position of the brake lever 804 is raised, the drive chain 1 is pulled upward, driving the drive sprocket 2 to rotate clockwise; when the rotating shaft 801 rotates in the direction of decreasing angle, the end position of the brake lever 804 is lowered, and the drive chain 1 is retracted downward under the action of the tension control mechanism 7, driving the drive sprocket 2 to rotate counterclockwise. When the photovoltaic tracking controller 806 controls the rotation of the rotating shaft 801 of the photovoltaic support, the brake lever 7 fixedly connected to the rotating shaft 801 will pull the drive chain 1 up and down. At this time, the up and down movement of the drive chain 1 will drive the drive sprocket 2 meshed with it to rotate. The drive sprocket 2 is connected to the brake wheel 5 through a one-way mechanism 3. Due to the existence of the one-way mechanism 3, the brake wheel 5 rotates when the drive sprocket 2 rotates clockwise (the drive chain 1 moves upward), and the brake wheel 5 does not rotate when the drive sprocket 2 rotates counterclockwise (the drive chain 1 moves downward). The electric lock 6 can apply frictional force to the brake wheel 5 through the locking brake pads under the control of an electric signal, thereby controlling the rotation of the brake wheel 5 or releasing the restriction to allow the brake wheel 5 to rotate. When the photovoltaic support is tracking normally, the electric lock 6 can release the brake pads under the control of an electric signal, and the brake wheel 5 can rotate freely between the two brake pads of the electric lock 6. When the photovoltaic support enters the anti-wind flatting working state, the electric lock 6 can apply frictional force to the brake wheel 5 through the locking brake pads under the control of an electric signal, control the rotation of the brake wheel 5, and finally apply a torque to the rotating shaft 801 of the photovoltaic support. This torque will always keep the rotating shaft 801 in a horizontal state, thus playing an anti-wind role.

[0087] The active locking chain anti-wind device designed and adopted in this example has the characteristics of simple and compact structure, easy installation and control, soft braking characteristics, and strong impact resistance.

[0088] Embodiment 2

[0089] This embodiment is a flat single-axis photovoltaic tracking support. The size of the photovoltaic panel (805) in this flat single-axis support is about 2256mm×1000mm, and it adopts a single-row vertical placement structure, that is, the long side (2256) of the panel is perpendicular to the main beam. The double-row panels are vertically placed on the rotating shaft 801. The main beam is a square tube with a size of 120mm×120mm and a wall thickness of 3mm. The rotating shaft 801 is installed on the support column 802 through a bearing 803, and the horizontal rotating shaft 801 and the photovoltaic panel 805 supported by the support column 802 are driven by an electric rotating drive device 807 to perform solar tracking within the range of ±60° east-west.

[0090] In this example, each set of flat single-axis trackers installs 3 strings of solar panels, with 25 solar panels in each string, for a total of 75 photovoltaic solar panels (solar modules). The maximum width of this set of brackets from east to west is 2256 mm, and the length from south to north is 78600 mm. There are 11 support columns 802 in total. The columns are numbered from south to north. Column 1 is the southernmost column, and column 11 is the northernmost column. Column 6 is in the middle of the tracking range, and an electric rotary drive is installed on it. Therefore, column 5 is called the drive column. The average center distance between each pair of columns is 7500 mm, and the main beams on the outermost two support columns 802, namely column 1 and column 11, each extend 1500 mm outwards.

[0091] In this example, a photovoltaic tracking controller 806 is installed on the rotating shaft 801 near column 802 of column 6 to control the rotation and tracking of the photovoltaic solar panels 805. Two sets of active locking chain type wind resistance devices 10 are installed on column 2 and column 10 support columns 802 respectively, as Figure 2 、 Figure 4 shown. In the active locking chain type wind resistance device 10, the drive sprocket 2 meshes with the drive chain 1. The upper end of the drive chain 3 is connected to the brake rod 804, and the brake rod 804 is fixedly connected to the rotating shaft 801. The lower end of the drive chain 3 is connected to a tension control mechanism 7, and the tension control mechanism 7 applies a constant vertically downward tension.

[0092] In this example, the active locking chain type wind resistance device uses the drive chain 1 as the transmission medium and the ratchet mechanism (brake ratchet 11, brake pawl 12) as the braking and locking device. Since the ratchet mechanism itself has a one-way locking property, this wind resistance device does not require an additional one-way mechanism to be designed.

[0093] As Figure 4 shown, the active locking chain type wind resistance device 10 includes: drive chain 1, drive sprocket 2, linkage shaft 4, guide wheel 9, brake ratchet 11, brake pawl 12, pawl spring 13, and electric pawl driver 14.

[0094] The drive chain 1 and the drive sprocket 2 are always meshed together. The function of the guide wheel 9 is to ensure that when the brake rod 804 pulls the drive chain 1 to move up and down, the drive chain 1 will not disengage from the drive sprocket 2. The guide wheel 9 is installed on the support platform 15 through a guide wheel pin shaft and can rotate freely around the guide wheel pin shaft. The drive sprocket 2 and the brake ratchet 11 are fixedly connected together through the linkage shaft 4. The linkage shaft 4 is sleeved on the support platform 15 through a polymer bearing and can rotate freely in the installation hole. The brake pawl 12 meshes with the brake ratchet 11. The brake pawl 12 is installed on the support platform 15 through a rotating shaft, and one end of the rotating shaft is connected to the electric pawl driver 14. The support platform 15 is installed on the corresponding support column 802. The function of the pawl spring 13 is to ensure that the brake pawl 12 can stably mesh with the brake ratchet 11.

[0095] The working principle of the active locking chain anti-wind device in this example is as follows: First, define the angle of the rotating shaft 801 when the photovoltaic panel 805 is horizontal as 0 degrees. When the photovoltaic panel 805 deflects to both sides and the included angle with the ground becomes larger, the deflection angle of the rotating shaft 801 increases. When the rotating shaft 801 rotates in the direction of increasing angle, the end position of the brake lever 7 is raised, and the transmission chain 1 is pulled upward, driving the transmission sprocket 2 to rotate clockwise; when the rotating shaft 801 rotates in the direction of decreasing angle, the end position of the brake lever 7 is lowered, and the transmission chain 1 is retracted downward under the action of the tension control mechanism 7, driving the transmission sprocket 2 to rotate counterclockwise. When the photovoltaic tracking controller 806 controls the rotation of the rotating shaft 801 of the photovoltaic support, the brake lever 804 fixedly connected to the rotating shaft 801 will pull the transmission chain 1 up and down. At this time, the up and down movement of the transmission chain 1 will drive the transmission sprocket 2 meshed with it to rotate. The transmission sprocket 2 is fixedly connected to the brake ratchet 11 through the linkage shaft 4. When the transmission sprocket 2 rotates clockwise (the transmission chain 1 moves upward), the brake ratchet 11 rotates clockwise with it; when it rotates counterclockwise (the transmission chain 1 moves downward), the brake ratchet 11 rotates counterclockwise with it. Due to the one-way locking property of the ratchet mechanism itself, when the brake ratchet 11 rotates counterclockwise, the brake pawl 12 will not restrict the rotation of the brake ratchet 11, so it will not have a braking effect. When the brake ratchet 11 rotates clockwise, under the action of the brake pawl 12, its rotation is restricted, thereby playing a braking role. The brake pawl 12 can be driven to rotate by the electric pawl driver 14 under the control of an electric signal, so that the active control of the meshing state between the pawl and the ratchet can be realized. When the photovoltaic support is tracking normally, the brake pawl 12 can be driven to rotate by the electric pawl driver 14 under the control of an electric signal, so that the pawl and the ratchet are in an unreleased state. At this time, the ratchet is not restricted by anything and can move freely, as shown in Figure 4 shown on the right; when the photovoltaic support enters the anti-wind flattening working state, the brake pawl 12 can be driven to rotate by the electric pawl driver 14 under the control of an electric signal, and under the action of the pawl spring 13, the pawl and the ratchet are in a meshing state. At this time, the brake ratchet 11 can only rotate counterclockwise, that is, the transmission chain 1 can only move downward. At the same time, under the action of the tension control mechanism 7, the rotating shaft 801 of the photovoltaic support can only move to the horizontal position, thereby realizing active anti-wind.

[0096] The active locking chain anti-wind device designed and adopted in this example has the advantages of simple and compact structure, easy installation and control, and low cost. However, its braking characteristics are relatively hard and its impact resistance is weak.

[0097] Embodiment 3

[0098] This example is a flat single-axis photovoltaic tracking bracket. The size of the photovoltaic panels (805) in this flat single-axis bracket is approximately 2256 mm × 1000 mm. It adopts a double-row horizontal placement structure, that is, the short side (1000) of the panel is perpendicular to the main beam. The double-row panels are vertically placed on the rotating shaft 801. The rotating shaft 801 uses a square tube with a size of 140 mm × 140 mm and a wall thickness of 3 mm. The rotating shaft 801 is installed on the support column 802 through bearings 803. The rotating shaft 801 and the photovoltaic panels 805 supported by the column 802 are driven by an electric slewing drive device 807 to perform solar tracking within the range of ±60° east-west.

[0099] In this example, each set of flat single-axis trackers installs 3 panel strings, with 18 panels in each string, for a total of 54 photovoltaic panels (module components). The maximum east-west width of this set of brackets is 2040 mm, and the north-south length is 62500 mm. There are a total of 9 support columns 802. The columns are numbered from south to north. The 1st column is the southernmost column, and the 9th column is the northernmost column. The 5th column is in the middle of the tracking range, and an electric slewing drive is installed on it, so the 5th column is called the drive column. The average center distance between each column is 7750 mm, and the main beams on the outermost 1st and 9th support columns 802 each extend 500 mm.

[0100] In this example, a photovoltaic tracking controller 806 is installed on the rotating shaft 801 near the 5th support column 802 to control the rotation and tracking of the photovoltaic panels 805. Two sets of active locking chain-type wind-resistant devices 10 are installed on the 2nd column and the 8th support column 802 respectively.

[0101] As Figure 2 、 Figure 5 shown, the inner and outer wire grooves of the drive cable pulley 22 in the active locking cable-type wind-resistant device 10 respectively wind around the drive cable 21 and the tension cable 26. One end of the drive cable 21 and the tension cable 26 is fixed on the drive cable pulley 22. The other end of the drive cable 21 is connected to the brake lever 804, and the brake lever 804 is fixedly connected to the rotating shaft 801. The other end of the tension cable 26 is connected to the tension control mechanism 7, and the tension control mechanism 7 applies a constant vertically downward tension to the tension cable 26. The winding directions of the drive cable 21 and the tension cable 26 on the drive cable pulley 22 are opposite to each other, that is, one winds counterclockwise and the other winds clockwise.

[0102] In this example, the active locking chain-type wind-resistant device uses steel cables (drive cable 21, tension cable 26) as the transmission medium, uses an electric caliper disc as the electric locking device 6, and uses a one-way needle bearing 23 (one-way overrunning bearing) as the one-way mechanism. As Figure 5As shown in the figure, the main structure of the cable-type wind-resistant device includes: a transmission cable 21, a tensioning cable 26, a transmission cable wheel 22, a linkage inner shaft 24, a linkage outer shaft 25, a one-way bearing 23, a brake wheel 5, and an electric lock 6. The transmission cable 21 and the tensioning cable 26 are respectively wound in the inner and outer winding grooves of the transmission cable wheel 22. The transmission cable wheel 22 is fixedly connected to the linkage inner shaft 24. The other end of the linkage inner shaft 24 is connected to the inner ring 28 of the one-way bearing 23 by a flat key. The outer ring 27 of the one-way bearing 23 is nested in the front shaft hole of the linkage outer shaft 25 by a flat key. The other end of the linkage outer shaft 25 is fixedly connected to the brake wheel 5. The linkage outer shaft 25 is sleeved on the support platform 15 through a polymer bearing and can rotate freely in the mounting hole of the support platform 15. The brake wheel 5 is clamped between the two brake pads of the electric lock 6. The electric lock 6 is installed on the support platform 15, and the support platform 15 is installed on the corresponding column (802). The structure of the one-way needle roller bearing 23 is as Figure 5 shown on the right. The one-way bearing needle roller 29 is designed with elliptical rollers. When the elliptical rollers rotate in the direction of the long axis, the inner and outer rings of the bearing restrict each other.

[0103] The working principle of the active locking chain type anti-wind device in this example is as follows: First, define the angle of the rotating shaft 801 when the photovoltaic panel 805 is horizontal as 0 degrees. When the photovoltaic panel 805 deflects to both sides and the angle with the ground becomes larger, the deflection angle of the rotating shaft 801 increases. When the rotating shaft 801 rotates in the direction of increasing angle, the end position of the brake lever 804 is raised, the transmission cable 21 is pulled out upward, and the transmission cable wheel 22 is driven to rotate clockwise; when the rotating shaft 801 rotates in the direction of decreasing angle, the end position of the brake lever 804 is lowered, and the tensioning cable 26 is pulled out downward under the action of the pulling force control mechanism 7, driving the transmission cable wheel 22 to rotate counterclockwise. When the photovoltaic tracking controller controls the rotation of the rotating shaft 801 of the photovoltaic support, the brake lever 804 fixedly connected to the rotating shaft 801 will pull the transmission cable 21 up and down. At this time, the up and down retraction of the transmission cable 21 will drive the transmission cable wheel 22 to rotate. The transmission cable wheel 22 is connected to the brake wheel 5 through a one-way bearing 23. Due to the existence of the one-way mechanism 104, the brake wheel 5 rotates when the transmission cable wheel 22 rotates clockwise (the transmission cable 21 is pulled out upward), and the brake wheel 5 does not rotate when the transmission cable wheel 22 rotates counterclockwise (the transmission cable 21 is retracted downward). The electric lock 6 can apply a frictional force to the brake wheel 5 through the locking brake pads under the control of an electrical signal, thereby controlling the rotation of the brake wheel 5 or releasing the restriction to allow the brake wheel 5 to rotate. When the photovoltaic support is tracking normally, the electric lock 6 can release the brake pads under the control of an electrical signal, and the brake wheel 5 can rotate freely between the two brake pads of the electric lock 6; when the photovoltaic support enters the anti-wind leveling working state, the electric lock 6 can apply a frictional force to the brake wheel 5 through the locking brake pads under the control of an electrical signal, control the rotation of the brake wheel 5, and finally apply a torque to the rotating shaft 801 of the photovoltaic support. This torque will always keep the rotating shaft 801 in a horizontal state, thus playing an anti-wind role.

[0104] The active locking chain type anti-wind device designed and adopted in this example has the characteristics of compact structure, low cost, soft braking characteristics, and strong impact resistance.

[0105] In the above example, different forms of active locking chain type anti-wind devices 10 are adopted for different types of flat single-axis support systems. The structural forms of photovoltaic supports are diverse, including flat single-axis large wingspan, flat single-axis small wingspan, and inclined single-axis, etc. The present invention designs three forms of anti-wind devices. Specifically, which form of anti-wind device is combined with which type of photovoltaic support does not affect the technical method of the present invention for locking the main rotating shaft.

Claims

1. The active locking chain type wind resistance device for a photovoltaic tracking bracket is characterized in that: It includes a rotating mechanism with a one-way locking function. When braking is applied through an electric signal, the rotating mechanism can only rotate in one direction, and the other direction is braked; when the braking is released through an electric signal, the rotating mechanism resumes its bidirectional rotation ability; the rotating mechanism is coaxially connected with a transmission mechanism; after the photovoltaic tracking bracket enters the wind-resistant mode, the rotating mechanism actively locks the rotating shaft in one direction, enabling the photovoltaic bracket to move unidirectionally to the optimal wind-resistant angle under the action of wind load. The rotating mechanism includes a one-way flywheel (3). A linkage shaft (4) is coaxially sleeved at the center of the one-way flywheel (3). One end of the linkage shaft (4) is connected to the one-way flywheel (3), and the other end of the linkage shaft (4) is coaxially sleeved with a brake wheel (5). An electric lock (6) is connected to the brake wheel (5) in a mating manner. The transmission mechanism includes a transmission sprocket (2). The outer wall of the one-way flywheel (3) is coaxially connected to the transmission sprocket (2). The transmission sprocket (2) is engaged with a transmission chain (1). When the transmission chain (1) is pulled, it will drive the transmission sprocket (2) to rotate synchronously. In the rotating mechanism, when the transmission chain (1) is pulled upward under an external force, the transmission sprocket (2) engaged with the transmission chain (1) rotates clockwise, and the linkage shaft (4) and the brake wheel (5) rotate coaxially with the transmission sprocket (2); at this time, the electric lock (6) can lock the rotation of the brake wheel (5) under the control of an electric signal, thereby prohibiting the transmission chain (1) from being pulled upward; the electric lock (6) can also, under the control of an electric signal, release the brake to allow the rotation of the brake wheel (5), thereby allowing the transmission chain (1) to be pulled upward. When the transmission chain (1) is retracted downward under an external force, it drives the transmission sprocket (2) to rotate in the opposite direction. When rotating in the opposite direction, the one-way flywheel (3) disengages from the connection of the transmission sprocket (2), the linkage shaft (4), and the brake wheel (5), and the transmission sprocket (2) rotates freely.

2. The active locking chain-type wind-resistant device for a photovoltaic tracking bracket according to claim 1, characterized in that: The photovoltaic tracking bracket includes a support column (802). The upper end of the support column (802) is provided with a rotating shaft (801) through a bearing (803). The support column (802) is connected to the outer ring of the bearing (803), and the rotating shaft (801) is coaxially sleeved on the inner ring of the bearing (803); a photovoltaic panel (805) is installed on the upper part of the rotating shaft (801), and a brake rod (804) is installed on the lower part of the rotating shaft; the upper end of the brake rod (804) is connected to the rotating shaft (801), the lower end of the brake rod (804) is connected to the upper end of the transmission chain (1), the middle part of the transmission chain (1) is engaged with the transmission sprocket (2), and the lower end of the transmission chain (1) is connected with a tension control mechanism (7). The tension control mechanism (7) applies a continuous downward pulling force to the transmission chain at the lower part of the transmission chain (1). It is set that when the brake rod (804) is vertically downward and the deflection angle of the rotating shaft (801) when the connection point position of the transmission chain (1) and the brake rod (804) is the lowest is the optimal wind-resistant angle; when the tracking bracket is at the optimal wind-resistant angle, the photovoltaic panel (805) is parallel to the ground, and at this time, the brake rod (804) is perpendicular to the photovoltaic panel (805). When the rotating shaft (801) drives the photovoltaic panel (805) to deflect to both sides, the end position of the brake lever (804) is raised, the transmission chain (1) is pulled out upward, driving the transmission sprocket (2) to rotate clockwise; when the rotating shaft (801) drives the photovoltaic panel (805) to rotate in the direction of decreasing angle, the end position of the brake lever (804) is lowered, and the transmission chain (1) is automatically retracted downward under the drive of the tension control mechanism (7), driving the transmission sprocket (2) to rotate counterclockwise; when the brake lever (804) rotates to the lowest position where the end connecting the transmission chain is located, the transmission chain (1) is in the limit retraction state, and this state corresponds to the wind resistance protection angle of the photovoltaic tracking bracket.

3. The active locking chain type wind resistance device for a photovoltaic tracking support is characterized in that: It includes a rotating mechanism with a one-way locking function. When braking is applied through an electrical signal, the rotating mechanism can only rotate in one direction, and the other direction is braked; when the braking is released through an electrical signal, the rotating mechanism resumes the ability to rotate bidirectionally; the rotating mechanism is coaxially connected with a transmission mechanism; after the photovoltaic tracking bracket enters the wind resistance mode, the rotating mechanism actively locks the rotating shaft unidirectionally, enabling the photovoltaic bracket to move unidirectionally to the optimal wind resistance angle under the action of wind load; The rotating mechanism includes a one-way bearing (23). A linkage inner shaft (24) is coaxially sleeved at the center of the one-way bearing (23). A hollow linkage outer shaft (25) is coaxially sleeved on the outer wall of the one-way bearing (23). One end of the linkage outer shaft (25) is coaxially sleeved with a brake wheel (5), and an electric lock (6) is cooperatively connected to the brake wheel (5); The transmission mechanism includes a transmission cable wheel (22). The other end of the linkage outer shaft (25) is fixedly connected and rotates coaxially with the transmission cable wheel (22). A transmission cable (21) is wound around the transmission cable wheel (22). When the transmission cable (21) is pulled upward, it will drive the transmission cable wheel (22) to rotate forward. At the same time, the transmission cable wheel (22) drives the brake wheel (5) to rotate through the linkage inner shaft (24), the one-way bearing (23), and the linkage outer shaft (25) in sequence; A tensioning cable (26) is also wound around the transmission cable wheel (22). The winding direction of the transmission cable (21) is opposite to that of the tensioning cable (26). The lower part of the tensioning cable (26) is connected with a tension control mechanism (7). The tension control mechanism (7) applies a continuous reverse torque to the transmission cable wheel (22) and the linkage inner shaft (24) through the tensioning cable (26). This torque is used to maintain the tension state of the transmission cable (21). Once the transmission cable (21) is slack, the extra cable length will be automatically wound onto the transmission cable wheel (22); The electric lock (6) locks or releases the rotation of the brake wheel (5) under the control of an electrical signal; when the electric lock (6) is released, the transmission cable (21) can be freely pulled out or reversed and wound by the transmission cable wheel (22) after being slack; when the electric lock (6) is locked, the brake wheel (5) restricts the forward rotation of the transmission cable wheel (22) through the linkage outer shaft (25), the one-way bearing (23), and the linkage inner shaft (24), thereby restricting the outward pulling of the transmission cable (21).

4. The active locking chain type wind resistance device for a photovoltaic tracking bracket according to claim 3, characterized in that: The one-way bearing (23) includes an outer ring (27) of the one-way bearing and an inner ring (28) of the one-way bearing. The outer ring (27) of the one-way bearing is connected to the brake wheel (5) through a linkage outer shaft (25), and the inner ring (28) of the one-way bearing is connected to the drive cable pulley (22) through a linkage inner shaft (24). One-way needle rollers (29) are arranged between the outer ring (27) of the one-way bearing and the inner ring (28) of the one-way bearing. Due to the one-way action of the one-way needle rollers (29), when the inner ring (28) of the one-way bearing rotates forward with the linkage inner shaft (24), it is locked with the outer ring (27) of the one-way bearing and rotates together. When the inner ring (28) of the one-way bearing rotates reversely with the linkage inner shaft (24), it is disconnected from the outer ring (27) of the one-way bearing and rotates independently.

Images