Direct current control box safety protection self-locking device and carrying system

Abstract

The utility model discloses a safety protection self-locking device for a direct current control box, and relates to the technical field of fault monitoring. The direct current control box safety protection self-locking device comprises a power supply access circuit, a first end of which is used for accessing a lithium battery power supply of electrical equipment; the first end of the direct-current control circuit is electrically connected with the second end of the power supply access circuit, the second end of the direct-current control circuit is electrically connected with the second end of the voltage monitoring circuit, and the direct-current control circuit is used for controlling a loading box of the electrical equipment to ascend or descend; the first end of the voltage monitoring circuit is electrically connected with the second end of the power supply access circuit, and the voltage monitoring circuit is used for controlling power failure between the power supply access circuit and the direct current control circuit under the condition that the voltage of the power supply access circuit is within a preset voltage range. The damage rate of the electrical equipment can be reduced.

Description

Technical Field

[0001] This application relates to the field of fault monitoring technology, and in particular to a self-locking device for safety protection of a DC control box. Background Technology

[0002] Currently, electrical equipment powered by lithium batteries requires external charging and energy storage before outputting power to the control box of the electrical equipment. During the output process, the voltage of the lithium battery is constantly changing, which can cause large voltage fluctuations during the operation of the electrical equipment. This can result in instantaneous high voltage that can damage the electrical components inside the control box, leading to a high failure rate of the electrical equipment. Utility Model Content

[0003] The main objective of this application is to propose a safety protection self-locking device for DC control boxes, which aims to monitor the operating voltage of the control box of electrical equipment, thereby reducing the damage rate of electrical equipment.

[0004] To achieve the above objectives, a first aspect of this application provides a safety protection self-locking device for a DC control box, comprising:

[0005] A power supply circuit, wherein the first terminal of the power supply circuit is used to connect to the lithium battery power supply of the electrical equipment;

[0006] A DC control circuit, wherein a first terminal of the DC control circuit is electrically connected to a second terminal of the power supply circuit, and a second terminal of the DC control circuit is electrically connected to a second terminal of the voltage monitoring circuit, and the DC control circuit is used to control the lifting or lowering of the loading box of the electrical equipment;

[0007] A voltage monitoring circuit is provided, wherein a first terminal of the voltage monitoring circuit is electrically connected to a second terminal of the power supply circuit, and the voltage monitoring circuit is used to control the power supply circuit and the DC control circuit to disconnect when the voltage of the power supply circuit is within a preset voltage range.

[0008] To achieve the above objectives, a second aspect of this application provides a transport system, comprising:

[0009] Elevator;

[0010] Loading box;

[0011] And the DC control box safety protection self-locking device described in the first aspect, when the DC control box safety protection self-locking device drives the hoist to operate, the hoist drives the loading box of the electrical equipment to rise or fall.

[0012] The DC control box safety protection self-locking device proposed in this application monitors the operating voltage of the power supply circuit through a voltage monitoring circuit. Under normal use, it keeps the power supply circuit and the DC control circuit energized to control the raising or lowering of the loading box of the electrical equipment. When the operating voltage of the power supply circuit is within a preset voltage range, the voltage monitoring circuit controls the power supply circuit and the DC control circuit to disconnect the power supply circuit to prevent instantaneous high or low voltage from damaging the electrical components inside the control box of the electrical equipment, thereby reducing the damage rate of the electrical equipment.

[0013] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0014] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0015] Figure 1 This is a structural block diagram of the safety protection self-locking device for the DC control box provided in the embodiments of this application;

[0016] Figure 2 This is a circuit diagram of the safety protection self-locking device for the DC control box provided in the embodiments of this application;

[0017] Figure 3 This is a structural block diagram of the handling system provided in the embodiments of this application. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0021] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0022] It should be noted that the embodiments of this application do not limit any improvement of the method, and the functions that the device or apparatus can achieve are only based on the hardware architecture of the device or apparatus itself.

[0023] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a structural block diagram of the DC control box safety protection self-locking device 100 provided in an embodiment of this application. Figure 1 As shown, this application embodiment provides a DC control box safety protection self-locking device 100, including:

[0025] A power access circuit 200, the first terminal of which is used to connect to the lithium battery power supply of the electrical equipment;

[0026] A DC control circuit 300 is provided, wherein a first terminal of the DC control circuit 300 is electrically connected to a second terminal of the power supply circuit 200, and a second terminal of the DC control circuit 300 is electrically connected to a second terminal of the voltage monitoring circuit 400. The DC control circuit 300 is used to control the lifting or lowering of the loading box of the electrical equipment.

[0027] A voltage monitoring circuit 400 is provided, the first end of which is electrically connected to the second end of the power supply circuit 200. The voltage monitoring circuit 400 is used to control the power supply circuit 200 and the DC control circuit 300 to disconnect the power supply when the voltage of the power supply circuit 200 is within a preset voltage range.

[0028] The safety protection self-locking device of the DC control box includes a power input circuit 200, a DC control circuit 300, and a voltage monitoring circuit 400. The power input circuit is used to connect to the lithium battery power supply of the electrical equipment. The first terminal of the power input circuit is connected to the lithium battery of the electrical equipment, and the second terminal is connected to the DC control circuit and the voltage monitoring circuit. When the voltage monitoring circuit controls the power input circuit and the DC control circuit to be energized, the DC control circuit can output a control signal to the driver according to actual needs, thereby controlling the lifting or lowering of the loading box of the electrical equipment through the driver. It should be noted that the electrical equipment in this embodiment includes electrical equipment powered by lithium batteries, such as electric forklifts, electric pallet trucks, and passenger elevators.

[0029] The voltage monitoring circuit 400 is electrically connected to the power supply circuit 200 and the DC control circuit to monitor the operating voltage of the power supply circuit 200. Under normal use, the power supply circuit 200 and the DC control circuit 300 are kept energized to control the raising or lowering of the loading box of the electrical equipment. When the operating voltage of the power supply circuit 200 is within the preset voltage range, the voltage monitoring circuit 400 controls the power supply circuit 200 and the DC control circuit 300 to disconnect the power supply to prevent instantaneous high or low voltage from damaging the electrical components in the control box of the electrical equipment, thereby reducing the damage rate of the electrical equipment.

[0030] Please see Figure 2 In some embodiments, the power supply circuit also includes an emergency stop button 201, a stop button 202, and a start button 203.

[0031] The first end of the emergency stop button 201 is electrically connected to the first end of the voltage monitoring circuit 400, the second end of the emergency stop button 201 is electrically connected to the first end of the stop button 202, the second end of the stop button 202 is electrically connected to the first end of the start button 203, and the second end of the start button 203 is electrically connected to the first end of the DC control circuit 300. When the contacts of the emergency stop button 201, the stop button 202, and the start button 203 are all closed, the power access circuit 200 is connected to the lithium battery power supply of the electrical equipment.

[0032] When using electrical equipment, pressing the emergency stop button 201 (even if the contacts of the emergency stop button 201 are closed), pressing the stop button 202 (even if the contacts of the stop button 202 are closed), and then pressing the start button 203 (even if the contacts of the start button 203 are closed) will connect the power supply circuit to the lithium battery power supply, thus energizing the power supply circuit.

[0033] Please see Figure 2In some embodiments, the DC control circuit 300 includes a first sub-circuit for controlling the lifting of the loading box of the electrical equipment. The first sub-circuit includes a first button 304, a first coil 307, a first normally closed contact 305, and a first switch 306.

[0034] The first end of the first button 304 is electrically connected to the start button 203, the second end of the first button 304 is electrically connected to the first end of the first normally closed contact 305, the second end of the first normally closed contact 305 is electrically connected to the first end of the first switch 306, the second end of the first switch 306 is electrically connected to the first end of the first coil 307, and the second end of the first coil 307 is electrically connected to the second end of the voltage monitoring circuit.

[0035] When the contacts of the first normally closed contact 305, the first switch 306, and the first button 304 are all closed, and the voltage monitoring circuit 400 controls the power supply circuit 200 and the DC control circuit 300 to be energized, the first sub-circuit controls the loading box of the electrical equipment to rise.

[0036] The DC control circuit 300 is a first sub-circuit used to control the lifting of the loading box of the electrical equipment. The first sub-circuit includes a first button 304, a first coil 307, a first normally closed contact 305, and a first switch 306. The first end of the first button 304 is electrically connected to the start button 203; the second end of the first button 304 is electrically connected to the first end of the first normally closed contact 305; the second end of the first normally closed contact 305 is electrically connected to the first end of the first switch 306; the second end of the first switch 306 is electrically connected to the first end of the first coil 307; and the second end of the first coil 307 is electrically connected to the second end of the voltage monitoring circuit. According to actual operating requirements, the first button 304 can be pressed. When the contacts of the first normally closed contact 305, the first switch 306, and the first button 304 are all closed, and the voltage monitoring circuit 400 controls the power supply input circuit 200 and the DC control circuit 300 to be energized, the first sub-circuit can send a control signal to control the lifting of the loading box of the electrical equipment. The number of first sub-circuits can be set according to actual conditions and is not limited here. For example, the electrical equipment is an electric pallet truck, which includes a hoist and a loading box. In actual use, a hoist is installed on the first side and the second side of the loading box, and each hoist requires a driver. The first sub-circuit includes a first sub-circuit and a second sub-circuit. The first sub-circuit can control the hoist installed on the first side of the loading box to operate, and the second sub-circuit can control the hoist installed on the second side of the loading box to operate. In this way, the first sub-circuit can control the hoist to operate in a certain direction, thereby driving the loading box of the electrical equipment to rise.

[0037] In addition, the DC control circuit 300 may also be equipped with a master control button 308 for controlling the lifting of the loading box of the electrical equipment. When the contacts of the master control button 308 are closed, the first sub-circuit is allowed to control the lifting of the loading box of the electrical equipment.

[0038] Please see Figure 2 In some embodiments, the DC control circuit 300 also includes a driver 312.

[0039] The driver 312 is electrically connected to the second terminal of the voltage monitoring circuit 400 via the second switch 311. When the second switch 311 is closed and the voltage monitoring circuit 400 controls the power supply circuit 200 and the DC control circuit 300 to be energized, the first sub-circuit controls the driver 312 to control the lifting of the loading box of the electrical equipment.

[0040] When the second switch 311 is closed and the voltage monitoring circuit 400 controls the power supply circuit 200 and the DC control circuit 300 to be energized, the control signal output by the first sub-circuit is transmitted to the driver 312 via the second switch 311. Thus, the first sub-circuit can control the driver 312 to control the lifting of the loading box of the electrical equipment. Furthermore, multiple types of drivers 312 can be used. For example, if two different types of drivers 312 are provided, and there are two second switches 311, then when either of the two second switches 311 is closed, the control signal from the first sub-circuit can be transmitted to either driver 312 electrically connected to the second switch 311, thereby controlling the lifting of the loading box of the electrical equipment through either driver 312 electrically connected to the second switch 311.

[0041] Please see Figure 2 In some embodiments, the DC control circuit 300 includes a second sub-circuit for controlling the descent of the loading box of the electrical equipment. The second sub-circuit includes a second button 301, a second coil 303, and a second normally closed contact 302.

[0042] The first end of the second button 301 is electrically connected to the start button 203, the second end of the second button 301 is electrically connected to the first end of the second normally closed contact 302, the second end of the second normally closed contact 302 is electrically connected to the first end of the second coil 303, and the second end of the second coil 303 is electrically connected to the second end of the voltage monitoring circuit 400.

[0043] When both the second normally closed contact 302 and the second button 301 are closed, and the voltage monitoring circuit 400 controls the power supply circuit 200 and the DC control circuit 300 to be energized, the second sub-circuit controls the loading box of the electrical equipment to descend.

[0044] The DC control circuit 300 may further include a second sub-circuit for controlling the descent of the loading box of the electrical equipment. The second sub-circuit includes a second button 301, a second coil 303, and a second normally closed contact 302. The first end of the second button 301 is electrically connected to the start button 203; the second end of the second button 301 is electrically connected to the first end of the second normally closed contact 302; the second end of the second normally closed contact 302 is electrically connected to the first end of the second coil 303; and the second end of the second coil 303 is electrically connected to the second end of the voltage monitoring circuit 400. Depending on actual operating requirements, the second button 301 can be pressed, closing both the second normally closed contact 302 and the second button 301. With the voltage monitoring circuit 400 controlling the power supply input circuit 200 and the DC control circuit 300 to be energized, the second sub-circuit can send a control signal to control the descent of the loading box of the electrical equipment. The number of second sub-circuits can be set according to actual conditions and is not limited here. For example, the electrical equipment is an electric pallet truck, which includes a hoist and a loading box. In actual use, a hoist is installed on the first side and the second side of the loading box, and each hoist requires a driver. The second sub-circuit includes a third sub-circuit and a fourth sub-circuit. The third sub-circuit can control the operation of the hoist installed on the first side of the loading box, and the fourth sub-circuit can control the operation of the hoist installed on the second side of the loading box. In this way, the second sub-circuit can control the hoist to operate in a certain direction, thereby driving the loading box of the electrical equipment to descend.

[0045] In addition, the DC control circuit 300 may also be equipped with a master control button 309 for controlling the descent of the loading box of the electrical equipment. When the contacts of the master control button 309 are closed, a second sub-circuit is allowed to control the descent of the loading box of the electrical equipment.

[0046] Please see Figure 2 In some embodiments, the DC control circuit 300 also includes a driver 312.

[0047] The driver is electrically connected to the second terminal of the voltage monitoring circuit 400 via a third switch 310. When the third switch 310 is closed and the voltage monitoring circuit 400 controls the power supply circuit 200 and the DC control circuit 300 to be energized, the second sub-circuit controls the driver to control the descent of the loading box of the electrical equipment.

[0048] When the third switch 310 is closed and the voltage monitoring circuit 400 controls the power supply circuit 200 and the DC control circuit 300 to be energized, the control output from the second sub-circuit is transmitted to the driver 312 via the third switch 310. Thus, the second sub-circuit can control the driver 312 to control the descent of the electrical equipment's loading box. Furthermore, multiple types of drivers 312 can be used. For example, if two different types of drivers 312 are used, and there are two third switches 310, then when either of the two third switches 310 is closed, the control signal from the second sub-circuit can be transmitted to either driver 312 connected to the third switch 310, thereby controlling the descent of the electrical equipment's loading box through either driver 312 electrically connected to the third switch 310.

[0049] Please see Figure 2 In some embodiments, the voltage monitoring circuit 400 includes: a voltage protector 404, a third trigger break 402, a third coil 403, and a fourth trigger break 401.

[0050] The first terminal of the voltage protector 404 is electrically connected to the second terminal of the power supply circuit 200, the second terminal of the voltage protector 404 is electrically connected to the first terminal of the third trigger break 402, and the second terminal of the third trigger break 402 is electrically connected to the first terminal of the power supply circuit 200. The voltage protector 404 is used to control the third trigger break 402 to open or close.

[0051] The first end of the third coil 403 is electrically connected to the first end of the third trigger break 402, the second end of the third coil 403 is electrically connected to the second end of the voltage protector 404, the first end of the fourth trigger break 401 is electrically connected to the second end of the power supply circuit 200, and the second end of the fourth trigger break 401 is electrically connected to the second end of the DC control circuit 300. The third coil 403 is used to control the fourth trigger break 401 to open or close.

[0052] The voltage monitoring circuit includes a voltage protector 404, a third trigger break 402, a third coil 403, and a fourth trigger break 401. The first terminal of the voltage protector 404 is electrically connected to the second terminal of the power supply circuit 200, and the second terminal of the voltage protector 404 is electrically connected to the first terminal of the third trigger break 402, which in turn is electrically connected to the first terminal of the power supply circuit 200. The first terminal of the third coil 403 is electrically connected to the first terminal of the third trigger break 402, and the second terminal of the third coil 403 is electrically connected to the second terminal of the voltage protector 404. The first terminal of the fourth trigger break 401 is electrically connected to the second terminal of the power supply circuit 200, and the second terminal of the fourth trigger break 401 is electrically connected to the second terminal of the DC control circuit 300. (This is in an embodiment of the application.) In this circuit, voltage protector 404 is a digital display DC voltage protector. The coil in voltage protector 404 is connected to an external 24V power supply. After the coil in voltage protector 404 is energized, the third contact 402 closes. After the power supply circuit 200 is connected to a lithium battery, the third coil 403 is energized, which controls the fourth contact 401 to close. Then, pressing the first or second button, etc., as needed, allows the equipment to operate normally. During the operation of the electrical equipment, voltage protector 404 monitors the operating voltage of the power supply circuit 200 in real time. The voltage parameter value of voltage protector 404 can be set according to actual conditions and is not limited here. If, during the operation of the electrical equipment, voltage protector 404 detects that the operating voltage of the power supply circuit 200 is not within the set voltage parameter value range, voltage protector 404 immediately controls the third contact 402 to open, causing the third coil 403 to lose power, thereby opening the fourth contact 401 and disconnecting the circuit of the electrical equipment. This protects the electrical components in the control box of the electrical equipment and reduces the damage rate of the electrical equipment. For example, the voltage parameter value of the voltage protector 404 is set to 42 volts to 55 volts, and the response time is 0.1 seconds. During the operation of the electrical equipment, if the parameter value of the voltage protector 404 detects that the operating voltage of the power supply circuit 200 is less than 42 volts or greater than 55 volts, the third trigger break 402 is immediately disconnected. After the third coil 403 is de-energized, the fourth trigger break 401 is automatically disconnected, thereby de-energizing the electrical equipment.

[0053] In addition, the voltage protector 404 can automatically reset after a preset time. After technicians have investigated the problem causing the abnormal voltage, the electrical equipment can be restored to normal operation by following the above steps. The preset time can be set according to the time situation and is not limited here.

[0054] In some embodiments, the voltage protector 404 includes a display screen for displaying the operating voltage of the power supply circuit.

[0055] The display screen can be electrically connected to the voltage protector 404, so that the display screen can obtain the operating voltage of the power supply circuit 200 from the voltage protector 404 and display the information.

[0056] Figure 3 This is a structural block diagram of the handling system provided in the embodiments of this application, such as... Figure 3 As shown in the embodiments of this application, a cargo handling system is also described, comprising:

[0057] Hoist 501;

[0058] Electrical equipment 502, the electrical equipment including a lithium battery power supply and a loading box;

[0059] In addition to the aforementioned DC control box safety protection self-locking device 100, when the DC control box safety protection self-locking device 100 drives the hoist to operate, the hoist drives the loading box of the electrical equipment to rise or fall.

[0060] The handling system includes a hoist 501, electrical equipment 502, and a DC control box safety protection self-locking device 100. The loading box of the electrical equipment 502 serves as a loading space for goods / personnel. The loading box of the electrical equipment 502 can be placed on the hoist 501 or electrically connected to the hoist 501. The hoist 501 can be electrically connected to the DC control box safety protection self-locking device 100, which controls the operation of the hoist, thereby raising or lowering the loading box of the electrical equipment.

[0061] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0062] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope defined by the claims of this application.

Claims

1. A safety protection self-locking device for a DC control box, characterized in that, The safety protection self-locking device of the DC control box includes: A power supply circuit, wherein the first terminal of the power supply circuit is used to connect to the lithium battery power supply of the electrical equipment; A DC control circuit, wherein a first terminal of the DC control circuit is electrically connected to a second terminal of the power supply circuit, and a second terminal of the DC control circuit is electrically connected to a second terminal of the voltage monitoring circuit, and the DC control circuit is used to control the lifting or lowering of the loading box of the electrical equipment; A voltage monitoring circuit is provided, wherein a first terminal of the voltage monitoring circuit is electrically connected to a second terminal of the power supply circuit, and the voltage monitoring circuit is used to control the power supply circuit and the DC control circuit to disconnect when the voltage of the power supply circuit is within a preset voltage range.

2. The self-locking safety protection device for the DC control box according to claim 1, characterized in that, The power supply circuit includes: an emergency stop button, a stop button, and a start button; The first end of the emergency stop button is electrically connected to the first end of the voltage monitoring circuit, the second end of the emergency stop button is electrically connected to the first end of the stop button, the second end of the stop button is electrically connected to the first end of the start button, and the second end of the start button is electrically connected to the first end of the DC control circuit. When the contacts of the emergency stop button, the stop button, and the start button are all closed, the power supply circuit is connected to the lithium battery power supply of the electrical equipment.

3. The self-locking safety protection device for the DC control box according to claim 2, characterized in that, The DC control circuit includes a first sub-circuit for controlling the lifting of the loading box of the electrical equipment. The first sub-circuit includes a first button, a first coil, a first normally closed contact, and a first switch. The first end of the first button is electrically connected to the start button, the second end of the first button is electrically connected to the first end of the first normally closed contact, the second end of the first normally closed contact is electrically connected to the first end of the first switch, the second end of the first switch is electrically connected to the first end of the first coil, and the second end of the first coil is electrically connected to the second end of the voltage monitoring circuit. When the contacts of the first normally closed contact, the first switch, and the first button are all closed, and the voltage monitoring circuit controls the power supply circuit and the DC control circuit to be energized, the first sub-circuit controls the loading box of the electrical equipment to rise.

4. The self-locking safety protection device for the DC control box according to claim 3, characterized in that, The DC control circuit also includes a driver; The driver is electrically connected to the second terminal of the voltage monitoring circuit via a second switch. When the second switch is closed and the voltage monitoring circuit controls the power supply circuit and the DC control circuit to be energized, the first sub-circuit controls the driver to control the lifting of the loading box of the electrical equipment.

5. The self-locking safety protection device for the DC control box according to claim 2, characterized in that, The DC control circuit includes a second sub-circuit for controlling the descent of the electrical equipment, the second sub-circuit including a second button, a second coil, and a second normally closed contact; The first end of the second button is electrically connected to the start button, the second end of the second button is electrically connected to the first end of the second normally closed contact, the second end of the second normally closed contact is electrically connected to the first end of the second coil, and the second end of the second coil is electrically connected to the second end of the voltage monitoring circuit. When both the second normally closed contact and the second button contact are closed, and the voltage monitoring circuit controls the power supply circuit and the DC control circuit to be energized, the second sub-circuit controls the electrical equipment to descend.

6. The self-locking safety protection device for the DC control box according to claim 5, characterized in that, The DC control circuit also includes a driver; The driver is electrically connected to the second terminal of the voltage monitoring circuit via a third switch. When the third switch is closed and the voltage monitoring circuit controls the power supply circuit and the DC control circuit to be energized, the second sub-circuit controls the driver to control the descent of the electrical equipment.

7. The self-locking safety protection device for the DC control box according to claim 1, characterized in that, The voltage monitoring circuit includes: a voltage protector and a third trigger breakpoint; The first terminal of the voltage protector is electrically connected to the second terminal of the power supply circuit, the second terminal of the voltage protector is electrically connected to the first terminal of the third trigger break, and the second terminal of the third trigger break is electrically connected to the first terminal of the power supply circuit. The voltage protector is used to control the opening or closing of the third trigger break.

8. The self-locking safety protection device for the DC control box according to claim 7, characterized in that, The voltage monitoring circuit also includes: a first relay, a third coil, and a fourth contact break; The first end of the third coil is electrically connected to the first end of the third trigger break, the second end of the third coil is electrically connected to the second end of the voltage protector, the first end of the fourth trigger break is electrically connected to the second end of the power supply circuit, the second end of the fourth trigger break is electrically connected to the second end of the DC control circuit, and the third coil is used to control the fourth trigger break to open or close.

9. The self-locking safety protection device for the DC control box according to claim 7, characterized in that, The voltage protector includes a display screen for displaying the operating voltage of the power supply circuit.

10. A handling system, characterized in that, include: Elevator; Electrical equipment, including a lithium battery power supply and a loading box; And the DC control box safety protection self-locking device according to any one of claims 1 to 9, wherein when the DC control box safety protection self-locking device drives the hoist to operate, the hoist drives the loading box of the electrical equipment to rise or fall.

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