Limit protection device and solar tracking bracket

Abstract

The present invention relates to a limit protection device and a solar tracking bracket. The solar tracking bracket comprises a column, a rotating shaft rotatably mounted on the column, a pull rod mounted on the rotating shaft and rotating with the rotating shaft, a motor for driving the rotating shaft to rotate, and a limit protection device. The limit protection device comprises a limit switch with contacts, a trigger mounted on the pull rod and used to trigger the limit switch contacts, and an on-off device whose on-off state is controlled by the limit switch. The limit switch is mounted on the column corresponding to the extreme position of the pull rod rotating with the rotating shaft, and the contacts of the limit switch are only on the movement path of the trigger. The on-off device is connected to the circuit where the motor is located, and the on-off device comprises a power tube or a relay. The present invention has a simple structure, convenient installation and debugging, strong versatility, and is safe and reliable.

Description

Technical Field

[0001] The invention relates to the field of solar power generation equipment, and in particular to a position limiting protection device and a solar tracking bracket using the position limiting protection device. Background Art

[0002] A solar tracking bracket is a device used to install a solar panel and drive the solar panel to track the sun. Existing solar tracking brackets often do not have limit protection devices for their extreme movement positions, or the limit protection devices are relatively complex and inconvenient to install and use. Summary of the invention

[0003] The object of the present invention is to provide a position limiting protection device suitable for a solar tracking bracket which has a simple structure and is convenient and reliable to use.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A limit protection device is arranged on a solar tracking bracket, the solar tracking bracket includes a column, a rotating shaft rotatably installed on the column, a pull rod installed on the rotating shaft and rotating with the rotating shaft, and a motor for driving the rotating shaft to rotate. The limit protection device includes a limit switch with contacts, a trigger installed on the pull rod and used to trigger the limit switch contacts, and an on-off device whose on-off state is controlled by the limit switch. The limit switch is installed on the column corresponding to the extreme position of the pull rod rotating with the rotating shaft, and the contacts of the limit switch are only on the movement path of the trigger, and the on-off device is connected to the circuit where the motor is located.

[0006] Preferably, the limit protection device comprises two limit switches, each of the two limit switches is installed corresponding to an extreme position of the pull rod rotating along the rotating shaft, and a trigger is installed at each end of the pull rod.

[0007] Preferably, the limit switch is installed obliquely on the column.

[0008] Preferably, the limit switch comprises a body, and the contact is arranged on the body through a telescopic component.

[0009] Preferably, the trigger at least includes a touch rod extending perpendicularly to the axial direction of the pull rod.

[0010] Preferably, the trigger further comprises a connecting rod connected to the touch rod and fixed on the pull rod.

[0011] Preferably, the on-off device includes a power tube or a relay; when the on-off device includes the power tube, the limit switch is connected to the gate of the power tube, and the source and drain of the power tube are connected in series in the circuit where the motor is located; when the on-off device includes the relay, the limit switch is connected to the coil of the relay, and the action node of the relay is connected in series in the circuit where the motor is located.

[0012] Preferably, the position limit protection device further comprises a detection circuit for detecting the triggered state of the contact and outputting a stop control signal to the motor to stop the motor when the contact is triggered.

[0013] Preferably, the detection circuit comprises a counter which starts counting when the contact is triggered and outputs a corresponding counting signal as the stop control signal to the motor.

[0014] The present invention also provides a solar tracking bracket capable of simply and safely limiting its movement limit position, and the solution is:

[0015] A solar tracking bracket comprises the aforementioned position limiting protection device.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the present invention has a simple structure, is easy to install and debug, has strong versatility, and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a front view schematic diagram of the solar tracking bracket of the present invention.

[0018] Attached Figure 2 It is a right side schematic diagram of the solar tracking bracket of the present invention.

[0019] Attached Figure 3 This is a circuit diagram of a solar tracking bracket of the present invention using a power tube as the switching device.

[0020] Attached Figure 4 This is a partial circuit diagram of a solar tracking bracket of the present invention in which a relay is used as the switching device.

[0021] In the above figures: 1, column; 2, bearing seat; 3, rotating shaft; 4, clamp; 5, pull rod; 6, limit switch; 7, body; 8, contact; 9, telescopic component; 10, trigger. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0023] Embodiment 1: As shown in the attached Figure 1 and attached Figure 2As shown, a solar tracking bracket includes a vertically arranged column 1, a rotating shaft 3 installed on the column 1 for horizontal rotation through a bearing seat 2, a pull rod 5 fixedly installed on the rotating shaft 3 through a clamp 4 and capable of rotating with the rotating shaft 3 and with a T-shaped cross-section, a motor connected to the rotating shaft 3 through a transmission mechanism and used to drive the rotating shaft 3 to rotate, and a limit protection device.

[0024] The limit protection device is used to protect the pull rod 5 from rotating with the shaft 3. The limit protection device includes a limit switch 6 with a contact 8, a trigger 10 installed on the pull rod 5 and used to trigger the contact 8 of the limit switch 6, and an on-off device whose on-off state is controlled by the limit switch 6.

[0025] The limit switch 6 is installed on the column 1 corresponding to the limit position of the pull rod 5 rotating with the rotating shaft 3. The limit switch 6 switches from the normally closed state to the normally open state when its contact 8 is triggered. In this embodiment, two limit switches 6 are used, respectively named as the east limit switch and the west limit switch. The two limit switches 6 are installed corresponding to an extreme position of the pull rod 5 rotating with the rotating shaft 3, that is, the two limit switches 6 are respectively set to the extreme position of the pull rod 5 rotating counterclockwise and the extreme position of the pull rod 5 rotating with the rotating shaft 3. When the pull rod 5 rotates to the extreme position, the trigger 10 installed on the pull rod 5 can trigger the contact 8 of the limit switch 6. Since two limit switches 6 are set, a trigger 10 is installed at each end of the pull rod 5 in this embodiment.

[0026] The limit switch 6 is installed on the column 1 at an angle according to the limit angle of rotation of the pull rod 5. The limit switch 6 includes a body 7, and a contact 8 is arranged on the body 7 through a telescopic assembly 9, so that the relative position of the contact 8 and the body 7 can be adjusted, so that the contact 8 is located on the movement path of the trigger 10 on the pull rod 5 (as shown by the dotted line in the figure), and the contact 8 of the limit switch 6 is only on the movement path of the trigger 10, that is, the contact 8 of the limit switch 6 is not in the space through which the pull rod 5 rotates, but only in the space through which the trigger 10 rotates. When the pull rod 5 rotates, only the trigger 10 can trigger the contact 8 of the limit switch 6, and the pull rod 5 will not collide with any part of the limit switch 6, thereby avoiding the limit switch 6 from being damaged due to excessive rotation of the pull rod 5. The trigger 10 includes at least a contact rod extending perpendicular to the axial direction of the pull rod 5, so that the trigger 10 protrudes from the pull rod 5 in the direction of the limit switch 6, so that the contact 8 is triggered only by the trigger 10. The trigger 10 may also include a connecting rod connected to the contact rod and fixed on the pull rod 5. For example, the entire trigger 10 is L-shaped, and two perpendicular parts constitute the touch rod and the connecting rod respectively.

[0027] The above is the mechanical part of the limit protection device, and the following is the circuit part of the limit protection device.

[0028] The on-off state of the on-off device is controlled by the limit switch 6, that is, the limit switch 6 is connected to the control circuit of the on-off device. The on-off device is connected to the circuit where the motor is located. Therefore, the on or off state of the circuit where the motor is located can be controlled by the limit switch 6. The on-off device includes a power tube or a relay.

[0029] As attached Figure 3 As shown, when the on-off device adopts a power tube (IGBT or MOSFET), the limit switch 6 is connected to the gate of the power tube, and the source and drain of the power tube are connected in series in the circuit where the motor is located. Specifically, after the two limit switches 6 used in this embodiment are connected in series, one end is connected to the power supply, and the other end is connected to the gate of the power tube. A matching circuit composed of a resistor and a capacitor can also be set between the limit switch 6 and the gate of the power tube. The source and drain of the power tube are connected between the output circuit of the motor and the ground. When the limit switch 6 is not triggered, the limit switch 6 is in a normally closed state, so that the power tube is turned on. When the motor power is turned on, it can form a circuit, so that the motor works. When the pull rod 5 moves to the limit position and triggers any limit switch 6, the limit switch 6 is opened, the power tube is cut off, and the circuit where the motor is located is open, and the motor stops working, thereby achieving safety protection.

[0030] As attached Figure 4 As shown, when the on-off device includes a relay, the limit switch 6 is connected to the coil of the relay, and the action node of the relay is connected in series in the circuit where the motor is located (this part is not shown in the figure). When the limit switch 6 is not triggered, the limit switch 6 is closed, the relay coil is energized so that the action node of the relay is closed, and the motor works. When the limit switch 6 is triggered, the limit switch 6 is opened, the relay coil loses power so that the action node of the relay is opened, the circuit where the motor is located is open, and the motor stops working.

[0031] On the basis of the above scheme, the circuit part of the limit protection device can also include a detection circuit, which is used to detect the triggered state of the contact 8 and output a stop control signal to the motor to stop the motor when the contact 8 is triggered. Figure 4As shown, the detection circuit includes a state acquisition circuit connected to the limit switch 6 and outputting different state signals when the limit switch 6 is in different states, and a counter connected to the state acquisition circuit and starting counting when the contact 8 is triggered and outputting the corresponding counting signal as a stop control signal to the motor. Among them, the state acquisition circuit includes an optical coupler connected to the limit switch 6 on the input side and connected to the counter on the output side. When the limit switch 6 is not triggered and closed, the optical coupler outputs a signal to the counter and controls the counter not to count, and when the limit switch 6 is triggered and disconnected, the optical coupler has no signal output, thereby triggering the counter to start counting at a certain frequency and outputting a counting signal, that is, when the count of the counter is greater than 0, it can be judged that the pull rod 5 has reached the limit position or a limit fault has occurred, and the motor needs to be turned off. At this time, the motor stops working according to the indication output by the counter as a stop control signal, and enters the fault handling procedure. Compared with the solution that only relies on the limit switch 6 to disconnect the motor circuit, this part of the solution can avoid the defect of being unable to disconnect the motor circuit due to the pull rod 5 exceeding the range of the limit switch 6 or the limit switch 6 being abnormal.

[0032] The present invention can safely control the rotation angle of the solar module, avoid damage after exceeding the maximum angle range, improve the safety and reliability of solar tracking, reduce the failure rate, and improve the economic benefits.

[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A position limiting protection device is arranged on a solar tracking bracket, wherein the solar tracking bracket comprises a column, a rotating shaft rotatably mounted on the column, a pull rod mounted on the rotating shaft and rotating with the rotating shaft, and a motor for driving the rotating shaft to rotate, characterized in that: The limit protection device includes a limit switch with contacts, a trigger installed on the pull rod and used to trigger the limit switch contacts, and an on-off device whose on-off state is controlled by the limit switch. The limit switch is installed on the column corresponding to the extreme position of the pull rod rotating with the rotating shaft, and the contacts of the limit switch are only on the movement path of the trigger. The on-off device is connected to the circuit where the motor is located; the on-off device includes a power tube or a relay; when the on-off device includes the power tube, the limit switch is connected to the gate of the power tube, and the source and drain of the power tube are connected in series in the circuit where the motor is located; when the on-off device includes the relay, the limit switch is connected to the coil of the relay, and the action node of the relay is connected in series in the circuit where the motor is located.

2. The position limiting protection device according to claim 1, characterized in that: The limit protection device comprises two limit switches, each of which is installed corresponding to an extreme position of the pull rod rotating along with the rotating shaft, and each of the two ends of the pull rod is installed with a trigger.

3. The position limiting protection device according to claim 1, characterized in that: The limit switch is installed obliquely on the column.

4. The position limiting protection device according to claim 1, characterized in that: The limit switch comprises a body, and the contact is arranged on the body through a telescopic component.

5. The position limiting protection device according to claim 1, characterized in that: The trigger at least includes a touch rod extending perpendicularly to the axial direction of the pull rod.

6. The position limiting protection device according to claim 5, characterized in that: The trigger also includes a connecting rod connected to the touch rod and fixed on the pull rod.

7. The position limiting protection device according to claim 1, characterized in that: The position limiting protection device also includes a detection circuit for detecting the triggered state of the contact and outputting a stop control signal to the motor to stop the motor when the contact is triggered.

8. The position limiting protection device according to claim 7, characterized in that: The detection circuit includes a counter that starts counting when the contact is triggered and outputs a corresponding counting signal as the stop control signal to the motor.

9. A solar tracking bracket, characterized in that: The solar tracking bracket includes a position limiting protection device as described in any one of claims 1 to 8.

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