Fault monitoring device and high-altitude maintenance system

Abstract

The utility model discloses a fault monitoring device and a high-altitude maintenance system, and relates to the technical field of fault monitoring. The fault monitoring device comprises a first switch, the first end of the first switch is electrically connected with a control circuit, the second end of the first switch is electrically connected with a driver, and the control circuit drives the elevator to operate through the driver; the current transformer is used for collecting working current of the electromagnetic brake, and the electromagnetic brake is used for providing braking force for operation of the elevator; and the control unit is electrically connected with the first switch and the current transformer, and is used for controlling the first switch to be switched off under the condition that the working current is not equal to the preset current and controlling the first switch to be switched on under the condition that the working current is equal to the preset current. The safety of high-altitude maintenance can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fault monitoring, in particular to a fault monitoring device and an aerial maintenance system. BACKGROUND

[0002] The aerial maintenance system is a special device for high-altitude operation, equipment installation, maintenance and other high-mobility high-altitude operation in various industries, including aerial maintenance platform and hoist and other devices, and the hoist is usually used for transmission to make the aerial maintenance platform ascend or descend. For some hoists, a power-off closed electromagnetic brake is usually equipped. The working principle of the power-off closed electromagnetic brake is that the electromagnetic brake is automatically closed in power-off to mechanically lock or brake the hoist, and the electromagnetic brake is in a released state in power-on, so that the hoist is no longer locked and can work normally. Nowadays, the working state of the electromagnetic brake cannot be directly observed by the maintenance and management personnel of the aerial maintenance system. When the electromagnetic drive part of the electromagnetic brake fails, for example, the coil of the electromagnetic brake cannot attract the mechanical brake part in power-on, and if the hoist is forced to start at this time, the hoist will forcibly run, causing damage to the circuit of the hoist, which may cause an operation accident of the aerial maintenance and has low safety. CONTENT OF THE INVENTION

[0003] The main purpose of the embodiment of the present application is to propose a fault monitoring device and an aerial maintenance system, which aims to monitor the working state of the electromagnetic brake, thereby improving the safety of the aerial maintenance.

[0004] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present application proposes a fault monitoring device, which comprises:

[0005] A first switch, a first end of the first switch is electrically connected with a control circuit, and a second end of the first switch is electrically connected with a driver, wherein the control circuit drives the hoist to run through the driver;

[0006] A current transformer is used to collect the working current of the electromagnetic brake, and the electromagnetic brake is used to provide braking force for the running of the hoist;

[0007] A control unit is electrically connected with the first switch and the current transformer respectively, and is used to control the first switch to be opened in the case that the working current is not equal to a preset current, and control the first switch to be closed in the case that the working current is equal to the preset current.

[0008] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present application proposes an aerial maintenance system, which comprises:

[0009] A hoist;

[0010] Electromagnetic brake

[0011] Control circuit

[0012] Driver

[0013] Overhead maintenance platform

[0014] The fault monitoring device of the first aspect, in the case that the driver drives the elevator to operate, the elevator drives the overhead maintenance platform to ascend or descend.

[0015] The fault monitoring device and the overhead maintenance system provided by the present application can monitor the working current of the electromagnetic brake through the current transformer and the control unit, and control the on-off of the first switch connected with the control circuit and the driver according to the relative relationship between the working current and the preset current. Through the foregoing fault monitoring device, the working state of the electromagnetic brake can be monitored, and the first switch is controlled to be turned off when the electromagnetic brake is abnormal, so that the elevator does not operate, thereby reducing the possibility of damage to the elevator circuit and improving the safety of the overhead maintenance.

[0016] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and achieved by the structure particularly pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0018] Figure 1 is a structural block diagram of the fault monitoring device provided by the embodiments of the present application;

[0019] Figure 2 is a structural block diagram of the overhead maintenance system provided by the embodiments of the present application;

[0020] Figure 3 is a connection relationship schematic diagram of the overhead maintenance system provided by the embodiments of the present application;

[0021] Figure 4 is another connection relationship schematic diagram of the overhead maintenance system provided by the embodiments of the present application. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0023] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the purpose of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0024] In the description of the present application, if there is a description of first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0025] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.

[0026] It should be noted that the embodiments of the present application do not limit the improvement of any method, and the function that the device or apparatus can achieve is only based on the hardware architecture of the device or apparatus itself.

[0027] The embodiments of the present application are further described below in conjunction with the drawings.

[0028] Figure 1 is a structural block diagram of the fault monitoring device provided by the embodiments of the present application. As shown in Figure 1 The embodiments of the present application provide a fault monitoring device, which comprises:

[0029] The first switch 101, the first end of the first switch 101 is electrically connected with the control circuit, the second end of the first switch 101 is electrically connected with the driver, wherein the control circuit drives the elevator to run through the driver;

[0030] The current transformer 102 is used for collecting the working current of the electromagnetic brake, and the electromagnetic brake is used for providing braking force for the running of the elevator;

[0031] The control unit 103 is electrically connected with the first switch 101 and the current transformer 102 respectively, and is configured to control the first switch 101 to be opened when the working current is not equal to the preset current, and control the first switch 101 to be closed when the working current is equal to the preset current.

[0032] The fault monitoring device comprises a first switch 101, a current transformer 102 and a control unit 103. The first end of the first switch 101 is electrically connected with a control circuit, and the second end of the first switch 101 is electrically connected with a driver. When the first switch 101 is closed, the control circuit can output a control signal to the driver, and then drive the hoist to operate through the driver. The electromagnetic brake is a device for providing braking force for the operation of the hoist. Through the electromagnetic brake, the operation of the hoist can be slowed down or stopped. It should be noted that the electromagnetic brake used in the embodiment of the present application is a power-off closing type electromagnetic brake, that is, the electromagnetic brake is automatically closed when power-off, and the hoist is mechanically locked or braked. When power-on, the hoist is not locked or braked, so that the hoist can work normally. Therefore, in the working process, the current transformer 102 can collect the working current of the electromagnetic brake, and transmit the collected working current to the control unit 103. The control unit 103 is electrically connected with the first switch 101 and the current transformer 102 respectively, and the control unit 103 can obtain the working current of the electromagnetic brake collected by the current transformer 102, and compare the working current with a preset current. The preset current can be determined according to the actual working condition, for example, it can be 1.2 ampere. If the working current is equal to the preset current, it can be determined that the electromagnetic brake is in a normal working state, and then the control unit 103 controls the first switch to be closed, so that the control signal sent by the control circuit can be transmitted to the driver. If the working current is not equal to the preset current, it can be determined that the electromagnetic brake is in an abnormal working state, and then the control unit 103 controls the first switch to be opened, so that the control signal sent by the control circuit cannot be transmitted to the driver. In addition, the working current is allowed to have a certain error, that is, when the working current is within a preset range determined based on the preset current, it is considered that the electromagnetic brake is in a normal working state. For example, when the preset current is 1.2 ampere, the preset range can be 1.15 ampere to 1.25 ampere, and if the working current is between 1.15 ampere and 1.25 ampere, it is determined that the electromagnetic brake is in a normal working state. In this way, the possibility of forcibly starting the hoist when the electromagnetic brake is not working normally is reduced, thereby reducing the possibility of damaging the hoist circuit, and ensuring the safety of the high-altitude maintenance operation.

[0033] The fault monitoring device provided in the application can monitor the working current of the electromagnetic brake through the current transformer and the control unit, and control the on-off of the first switch connected to the control circuit and the driver according to the relative relationship between the working current and the preset current. Through the foregoing fault monitoring device, the working state of the electromagnetic brake can be monitored, and the first switch is controlled to be turned off when the electromagnetic brake is abnormal, so that the elevator does not run, thereby reducing the possibility of damage to the elevator circuit and improving the safety of high-altitude maintenance.

[0034] In some embodiments, the fault monitoring device further comprises an alarm unit in communication with the control unit, and the alarm unit is configured to output an alarm signal when the working current is not equal to the preset current.

[0035] The fault monitoring device further comprises an alarm unit. The alarm unit is in communication with the control unit 103. When the working current is not equal to the preset current, the alarm unit can output an alarm signal to prompt the operator that the electromagnetic brake is abnormal and that appropriate safety measures should be taken for the electromagnetic brake. The alarm signal can be an audible and visual alarm signal, a vibration alarm signal, or other signals that can alert the operator. In this way, the safety of high-altitude maintenance can be further improved.

[0036] In some embodiments, the fault monitoring device further comprises a display screen configured to display the working current of the electromagnetic brake.

[0037] The fault monitoring device further comprises a display screen. The display screen can be electrically connected to the current transformer 102 or the control unit 103, so that the display screen can obtain the working current of the electromagnetic brake from the current transformer 102 or the control unit 103 and display it. In addition, the display screen can also be electrically connected to the alarm unit, so as to obtain the alarm signal output by the alarm unit and display the alarm signal.

[0038] Figure 2 is a structural block diagram of the high-altitude maintenance system provided by the embodiments of the application. As shown in Figure 2 The embodiments of the application also provide a high-altitude maintenance system, which comprises:

[0039] an elevator 201;

[0040] an electromagnetic brake 202;

[0041] a control circuit 203;

[0042] a driver 204;

[0043] a high-altitude maintenance platform 205; and

[0044] The above-mentioned fault monitoring device 206 can monitor the working current of the electromagnetic brake 202. In the case of abnormal working current of the electromagnetic brake 202, the fault monitoring device 206 can disconnect the first switch 101 in the fault monitoring device 206, so that the control signal output by the control circuit 203 cannot be transmitted to the driver 204. In this way, in the case of abnormal working of the electromagnetic brake 202, the possibility of forcibly starting the hoist 201 can be reduced, and the safety of the aerial maintenance system is ensured.

[0045] The aerial maintenance system can include a hoist 201, an electromagnetic brake 202, a control circuit 203, a driver 204, an aerial maintenance platform 205, and a fault monitoring device 206. The aerial maintenance platform 205 is a device that provides a working space and support for a maintenance process, and can be applied to a work scene that requires lifting workers or materials to a certain height. The control circuit 203 can output a control signal to the driver 204, so as to drive the DC motor of the hoist 201 to operate through the driver 204. When the hoist 201 operates, the hoist 201 can drive the aerial maintenance platform 205 to ascend or descend. The electromagnetic brake 202 is used to provide braking force for the operation of the hoist 201. The fault monitoring device 206 can monitor the working current of the electromagnetic brake 202. In the case of abnormal working current of the electromagnetic brake 202, the fault monitoring device 206 can disconnect the first switch 101 in the fault monitoring device 206, so that the control signal output by the control circuit 203 cannot be transmitted to the driver 204. In this way, in the case of abnormal working of the electromagnetic brake 202, the possibility of forcibly starting the hoist 201 can be reduced, and the safety of the aerial maintenance system is ensured.

[0046] Figure 3 is a schematic diagram of a connection relationship of an aerial maintenance system provided by an embodiment of the present application. As shown in Figure 3 In some embodiments, the control circuit 203 includes a plurality of control buttons, and the plurality of control buttons includes:

[0047] An emergency stop button 301, the emergency stop button 301 is a normally closed button, and in the case that the contact of the emergency stop button 301 is disconnected, the hoist 201 stops operating within a preset time length;

[0048] A stop button 302, the stop button 302 is a normally open button;

[0049] A start button 303, the start button 303 is a normally open button;

[0050] The first end of the emergency stop button 301 is electrically connected with the power supply, the second end of the emergency stop button 301 is electrically connected with the first end of the stop button 302, and the second end of the stop button 302 is electrically connected with the first end of the start button 303. When the contacts of the emergency stop button 301, the contacts of the stop button 302 and the contacts of the start button 303 are all closed, the elevator 201 operates. When at least one of the contacts of the stop button 302 and the contacts of the start button 303 is open, the elevator 201 does not operate.

[0051] The control circuit 203 includes a plurality of control buttons, including an emergency stop button 301, a stop button 302 and a start button 303. The first end of the emergency stop button 301 can be electrically connected with the power supply, the second end of the emergency stop button 301 is electrically connected with the first end of the stop button 302, and the second end of the stop button 302 is electrically connected with the first end of the start button 303. It should be noted that the aerial maintenance system can also be provided with a power converter. When the voltage of the external power supply (for example, 48 volts) does not meet the voltage requirement (for example, 24 volts) of the aerial maintenance system, the power converter can be used to step down the current input by the power supply. At this time, the first end of the emergency stop button 301 is connected with the first end of the power converter, and the second end of the power converter is electrically connected with the power supply.

[0052] The emergency stop button 301 is a normally closed button, the stop button 302 is a normally open button, and the start button 303 is a normally open button. In the preparation stage of the aerial maintenance system operation, if the emergency stop button 301 is not pressed, the stop button 302 is pressed and the start button 303 is pressed, the contacts of the emergency stop button 301, the contacts of the stop button 302 and the contacts of the start button 303 are all closed at this time. When the contacts of the emergency stop button 301, the contacts of the stop button 302 and the contacts of the start button 303 are all closed, the elevator 201 operates. When at least one of the contacts of the stop button 302 and the contacts of the start button 303 is open, the elevator 201 does not operate. When the contacts of the emergency stop button 301 are open, the elevator 201 can stop operating within a preset time. The preset time is a short time, which can make the elevator 201 stop operating quickly in an emergency. In this way, through the plurality of control buttons, the aerial maintenance system can be initially started, and the elevator 201 can be controlled subsequently.

[0053] Continue as Figure 3 shown, in some embodiments, the control circuit 203 further includes:

[0054] The descending unit comprises a descending button 304, a first dynamic break contact 305 and a first coil 306. The first end of the descending button 304 is electrically connected with the second end of the starting button 303, the second end of the descending button 304 is electrically connected with the first end of the first dynamic break contact 305, the second end of the first dynamic break contact 305 is electrically connected with the first end of the first coil 306, and the second end of the first coil 306 is electrically connected with the first end of the first switch 101 in the fault monitoring device. When the first switch, the contacts of the plurality of control buttons and the contacts of the descending button 304 are all closed, the descending unit is used to control the operation of the hoist 201 to drive the aerial maintenance platform 205 to descend.

[0055] The control circuit 203 can further comprise a descending unit. The descending unit comprises a descending button 304, a first dynamic break contact 305 and a first coil 306. The first end of the descending button 304 is electrically connected with the second end of the starting button 303, the second end of the descending button 304 is electrically connected with the first end of the first dynamic break contact 305, the second end of the first dynamic break contact 305 is electrically connected with the first end of the first coil 306, and the second end of the first coil 306 is electrically connected with the first end of the first switch 101 in the fault monitoring device. According to actual operation requirements, the descending button 304 can be pressed. In this way, when the first switch 101, the contacts of the plurality of control buttons and the contacts of the descending button 304 are all closed, the descending unit can control the operation of the hoist 201 through the driver 204, so as to drive the aerial maintenance platform 205 to descend. The number of the descending unit is determined according to the number of the hoists 201 arranged, which is not limited herein. For example, if one hoist 201 is arranged on the first side and the second side of the aerial maintenance platform 205 respectively, the descending unit can comprise a first descending unit and a second descending unit. The first descending unit can control the operation of the hoist 201 arranged on the first side of the aerial maintenance platform 205, and the second descending unit can control the operation of the hoist 201 arranged on the second side of the aerial maintenance platform 205. In this way, through the descending unit, the hoist 201 can be controlled to operate in a certain direction, so as to drive the aerial maintenance platform 205 to descend.

[0056] In addition, the control circuit 203 can further comprise a descending master control button 307. When the contacts of the descending master control button 307 are closed, the descending unit is allowed to control the operation of the hoist 201, so as to further improve the safety of the aerial maintenance system.

[0057] Reference Figure 3As shown, in some embodiments, the driver 204 is electrically connected with the second end of the first switch 101 through the second switch 308, and in the case that the first switch 101 and the second switch 308 are closed, the lowering unit controls the driver 204 to control the operation of the hoist 201 to drive the aerial maintenance platform 205 to lower.

[0058] The driver 204 is electrically connected with the second end of the first switch 101 through the second switch 308. In the case that the first switch 101 and the second switch 308 are closed, the control signal output by the control circuit 203 is transmitted to the driver 204 through the first switch 101 and the second switch 308, so that the lowering unit can control the driver 204 to control the operation of the hoist 201 to drive the aerial maintenance platform 205 to lower. In addition, multiple types of drivers 204 can be used. For example, if two drivers 204 of different types are provided, and the number of second switches 308 is two, in the case that any one of the two second switches 308 is closed, the control signal can be transmitted to the driver 204 electrically connected with the second switch 308, so as to drive the hoist 201 to operate through the driver 204 electrically connected with the second switch 308.

[0059] In some embodiments, the control circuit 203 further comprises:

[0060] The raising unit comprises a raising button 309, a second movable contact 310, a third switch 311, and a second coil 312. The first end of the raising button 309 is electrically connected with the second end of the starting button 303, the second end of the raising button 309 is electrically connected with the first end of the second movable contact 310, the second end of the second movable contact 310 is electrically connected with the first end of the third switch 311, the second end of the third switch 311 is electrically connected with the first end of the second coil 312, and the second end of the second coil 312 is electrically connected with the first end of the first switch 101 in the fault monitoring device. In the case that the first switch, the contacts of the plurality of control buttons, and the contacts of the raising button 309 are closed, the raising unit is configured to control the operation of the hoist 201 to drive the aerial maintenance platform 205 to raise.

[0061] The control circuit 203 can further include a rising unit. The rising unit includes a rising button 309, a second dynamic break contact 310, a third switch 311, and a second coil 312. The first end of the rising button 309 is electrically connected to the second end of the starting button 303, the second end of the rising button 309 is electrically connected to the first end of the second dynamic break contact 310, the second end of the second dynamic break contact 310 is electrically connected to the first end of the third switch 311, the second end of the third switch 311 is electrically connected to the first end of the second coil 312, and the second end of the second coil 312 is electrically connected to the first end of the first switch 101 in the fault monitoring device. According to actual operation requirements, the rising button 309 can be pressed, so that the rising unit can control the operation of the hoist 201 through the driver 204 to drive the aerial maintenance platform 205 to rise, under the condition that the first switch 101, the contacts of the plurality of control buttons, and the contacts of the rising button 309 are all closed. The number of the rising unit is determined according to the number of the hoists 201 arranged, which is not limited here. For example, if one hoist 201 is arranged on each of the first side and the second side of the aerial maintenance platform 205, the rising unit can include a first rising unit and a second rising unit, the first rising unit can control the operation of the hoist 201 arranged on the first side of the aerial maintenance platform 205, and the second rising unit can control the operation of the hoist 201 arranged on the second side of the aerial maintenance platform 205. In this way, the hoist 201 can be controlled to operate in a certain direction through the rising unit, thereby driving the aerial maintenance platform to rise.

[0062] In addition, the control circuit 203 can be further provided with a rising master control button 313. Under the condition that the contacts of the rising master control button 313 are closed, the rising unit is allowed to control the operation of the hoist 201, so as to further improve the safety of the aerial maintenance system.

[0063] In some embodiments, the driver 204 is electrically connected to the second end of the first switch 101 through a fourth switch 314, and under the condition that the first switch 101 and the fourth switch 314 are closed, the rising unit controls the operation of the hoist 201 through the driver 204 to drive the aerial maintenance platform 205 to rise.

[0064] The driver 204 is electrically connected to the second end of the first switch 101 through the fourth switch 314. Under the condition that the first switch 101 and the fourth switch 314 are both closed, the control signal output by the control circuit 203 is transmitted to the driver 204 through the first switch 101 and the fourth switch 314, so that the rising unit can control the driver 204 to control the operation of the hoist 201, thereby driving the aerial maintenance platform 205 to rise.

[0065] Figure 4is another connection relationship schematic view of the aerial maintenance system provided by the embodiment of the present application. As shown in Figure 4 In some embodiments, the electromagnetic brake 202 includes a brake coil 401, the brake coil 401 is arranged in the current transformer 102 in the fault monitoring device, and the current transformer 102 obtains the working current of the electromagnetic brake 202 by collecting the current of the brake coil 401.

[0066] The electromagnetic brake 202 includes the brake coil 401, and mainly generates magnetic force through the brake coil 401, thereby providing the hoist 201 with braking force. The brake coil 401 is arranged in the current transformer 102, so that the current transformer 102 can collect the current of the brake coil 401, thereby obtaining the working current of the electromagnetic brake 202. Moreover, through the display screen 402 in the fault monitoring device 206, the working current of the electromagnetic brake 202 can be displayed in real time.

[0067] It should be noted that, Figure 4 The components of the aerial maintenance system shown in Figure 3 are electrically connected through the contact 315.

[0068] It should also be noted that the terms “comprising”, “including”, or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent in such processes, methods, articles, or devices. Without more limitations, the element defined by the statement “comprising a” does not exclude the presence of additional identical elements in the process, method, article, or device including the element.

[0069] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope defined by the claims of the present application.

Claims

1. A fault monitoring device, characterized in that, include: A first switch, the first end of which is electrically connected to a control circuit, and the second end of which is electrically connected to a driver, wherein the control circuit drives the hoist to operate through the driver; A current transformer is used to collect the operating current of the electromagnetic brake, which is used to provide braking force for the operation of the hoist. The control unit is electrically connected to the first switch and the current transformer respectively, and is used to control the first switch to open when the operating current is not equal to the preset current, and to control the first switch to close when the operating current is equal to the preset current.

2. The fault monitoring device according to claim 1, characterized in that, The fault monitoring device also includes an alarm unit that communicates with the control unit. The alarm unit is used to output an alarm signal when the operating current is not equal to the preset current.

3. The fault monitoring device according to claim 1, characterized in that, The fault monitoring device also includes a display screen, which is used to display the operating current of the electromagnetic brake.

4. A high-altitude maintenance system, characterized in that, include: Elevator; Electromagnetic brake; Control circuit; drive; High-altitude maintenance platform; as well as According to any one of claims 1 to 3, when the drive unit drives the hoist to operate, the hoist causes the high-altitude maintenance platform to rise or fall.

5. The high-altitude maintenance system according to claim 4, characterized in that, The control circuit includes multiple control buttons, the multiple control buttons including: An emergency stop button, which is a normally closed button, will cause the hoist to stop operating within a preset time when the contacts of the emergency stop button are open. A stop button, which is a normally open button; A start button, wherein the start button is a normally open button; The first end of the emergency stop button is electrically connected to the power supply, the second end of the emergency stop button is electrically connected to the first end of the stop button, and the second end of the stop button is electrically connected to the first end of the start button. The hoist operates when all three contacts—the emergency stop button, the stop button, and the start button—are closed. The hoist does not operate when at least one of the contacts of the stop button and the start button is open.

6. The high-altitude maintenance system according to claim 5, characterized in that, The control circuit also includes: The descent unit includes a descent button, a first normally closed contact, and a first coil. The first end of the descent button is electrically connected to the second end of the start button, the second end of the descent 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 coil, and the second end of the first coil is electrically connected to the first end of the first switch in the fault monitoring device. When the contacts of the first switch, the plurality of control buttons, and the descent button are all closed, the descent unit is used to control the operation of the hoist to drive the high-altitude maintenance platform to descend.

7. The high-altitude maintenance system according to claim 6, characterized in that, The driver is electrically connected to the second terminal of the first switch via a second switch. When the first switch and the second switch are closed, the descent unit controls the hoist to operate by controlling the driver, thereby driving the high-altitude maintenance platform to descend.

8. The high-altitude maintenance system according to claim 5, characterized in that, The control circuit also includes: The lifting unit includes a lifting button, a second normally closed contact, a third switch, and a second coil. The first end of the lifting button is electrically connected to the second end of the start button, the second end of the lifting 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 third switch, the second end of the third switch is electrically connected to the first end of the second coil, and the second end of the second coil is electrically connected to the first end of the first switch in the fault monitoring device. When the contacts of the first switch, the plurality of control buttons, and the lifting button are all closed, the lifting unit is used to control the operation of the hoist to drive the high-altitude maintenance platform to rise.

9. The high-altitude maintenance system according to claim 8, characterized in that, The driver is electrically connected to the second end of the first switch via a fourth switch. When the first switch and the fourth switch are closed, the lifting unit controls the hoist to operate by controlling the driver, thereby driving the high-altitude maintenance platform to rise.

10. The high-altitude maintenance system according to claim 4, characterized in that, The electromagnetic brake includes a brake coil, which is connected to a current transformer in the fault monitoring device. The current transformer obtains the operating current of the electromagnetic brake by collecting the current of the brake coil.

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