Dual-power-supply automatic switching device for comprehensive protection device of belt conveyor
The dual-power automatic switching device of the belt conveyor integrated protection system utilizes mechanical interlocking and voltage monitoring technology to achieve automatic switching in case of main power failure, solving the problem of easy failure and shutdown when powered by a single power supply, and ensuring the continuous operation and safety of the equipment.
Patent Information
- Application Number
- CN202520482249.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-19
AI Technical Summary
In belt conveyor control systems, single-power supply is prone to failure and shutdown, has long switching delays, and lacks safety. In particular, in complex underground environments, the aging of contactors accelerates, increasing the risk of failure.
The system employs a dual-power automatic switching device. Through the parallel interlocking structure of the main and backup power supplies, and utilizing the mechanical interlocking of the first and second contactors and the monitoring of the voltage comparator, it automatically switches to the backup power supply when the main power supply fails, thus avoiding interruption of the PLC control signal and ensuring continuous operation of the equipment.
It achieves seamless switching without voltage drop during power failure, ensuring continuous operation of the belt conveyor and avoiding short circuits and backflow problems caused by equipment shutdown and parallel connection of dual power supplies, thereby improving equipment reliability and safety.
Smart Images
Figure CN223928126U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to coal mine underground power supply equipment technical field especially relates to a belt conveyor comprehensive protection device dual power automatic switching device. BACKGROUND
[0002] In the belt conveyor control system, the traditional power supply mode of protector and PLC console usually adopts single 127V comprehensive protection power supply, however, once the control power supply is powered off due to phase break, fuse blowout or line fault, the PLC console will be immediately stopped, and manual troubleshooting and switching standby power supply are needed, which seriously restricts production efficiency, and single power supply has no automatic switching mechanism, and the complex underground environment easily aggravates the aging of contactor, further increasing the risk of failure.
[0003] Therefore, aiming at the above problems, the utility model provides a kind of belt conveyor comprehensive protection device dual power automatic switching device, zero interruption power supply of belt conveyor control power is realized by main and standby power supply parallel interlock, and equipment reliability is significantly improved. UTILITY MODEL CONTENTS
[0004] In order to overcome the problems of single power supply failure, long switching delay and insufficient safety in the process of using traditional belt conveyor comprehensive protection device power supply in daily use.
[0005] The technical scheme of the utility model is: a kind of belt conveyor comprehensive protection device dual power automatic switching device, including main power supply, standby power supply, switching component and load power supply interface, switching component is arranged on the side of main power supply, load power supply interface is arranged on the side of main power supply, load power supply interface is provided with two groups, two groups of load power supply structure are located on the two sides of main power supply respectively, the input end of main power supply is sequentially provided with first disconnecting switch and first fuse, the input end of standby power supply is sequentially provided with second disconnecting switch and second fuse, the output end of main power supply and standby power supply is connected to load power supply interface by switching component after parallel connection, switching component includes interlock control circuit, for automatically switching to standby power supply when main power supply is powered off.
[0006] Preferably, through the mechanical interlocking structure of the first contactor and the second contactor, when the main power fails, the first contactor coil loses power, causing the normally closed auxiliary contact to close, and the second contactor coil is momentarily powered on. The main power voltage is monitored in real time by the voltage comparator, and the abnormal signal triggers the logic controller to output the switching command synchronously, avoiding the interruption of the PLC control signal, so as to realize no voltage drop during switching, protect the power supply of the protector and the PLC controller, and ensure the continuous operation of the belt conveyor. Through seamless switching, the equipment is continuously operated, and the normally closed auxiliary contact of the first contactor in the interlocking control circuit is connected in series to the coil loop of the second contactor, and the normally closed auxiliary contact of the second contactor is connected in series to the coil loop of the first contactor. When the main power is working, the normally closed contact of the first contactor is disconnected, and the standby power supply loop is physically isolated; after switching to the standby power supply, the normally closed contact of the second contactor is synchronously disconnected, blocking the main power loop, thereby realizing interlocking protection and avoiding the problems of short circuit and reverse current caused by parallel connection of dual power supply.
[0007] As a preferred, the switching assembly further comprises a first contactor and a second contactor, the main contact of the first contactor is connected in series in the output circuit of the main power supply, the normally closed auxiliary contact of the first contactor is connected in series with the coil loop of the second contactor, the main contact of the second contactor is connected in series in the output circuit of the standby power supply, and the normally closed auxiliary contact of the second contactor is connected in series with the coil loop of the first contactor, forming a mechanical interlocking structure.
[0008] As a preferred, in the output circuit of the main power supply, the main contact of the first contactor and the main contact of the second contactor are alternately connected in series, forming a three-level redundant control, and in the output circuit of the standby power supply, the main contact of the second contactor and the main contact of the first contactor are alternately connected in series, forming a symmetric redundant control.
[0009] As a preferred, voltage sensors connected with phase lines are arranged in the power supply circuits of the main power supply and the standby power supply, and the voltage sensors are used to monitor the phase state of the power supply in real time and trigger the switching assembly to perform switching action when detecting phase failure.
[0010] As a preferred, in the interlocking control circuit, the normally closed auxiliary contact of the first contactor is connected with the output end of the standby power supply and connected in series to the coil loop of the second contactor, and the normally closed auxiliary contact of the second contactor is connected with the output end of the main power supply and connected in series to the coil loop of the first contactor, forming a cross interlocking logic.
[0011] As preferred, the side of the load power supply interface is provided with a control assembly, the control assembly comprises a voltage comparator and a logic controller, the side of the voltage comparator is provided with the logic controller, the voltage comparator is used for collecting voltage signals of the main power supply device and the backup power supply device in real time, and when the voltage of the main power supply device is lower than a threshold value, the logic controller is used for driving the switching assembly to switch to the backup power supply device.
[0012] As preferred, the main power supply device and the backup power supply device are independently arranged 127V comprehensive protection power supplies, output ends of the main power supply device and the backup power supply device are used for being connected with a power supply input end of a protector control end of an external belt conveyor and a PLC console through cables, and the main power supply device is externally provided with a distribution box.
[0013] The utility model discloses the beneficial effects of:
[0014] 1, through the mechanical interlocking structure of first contactor and second contactor, when the main power supply fails, the first contactor coil loses power and causes the normally closed auxiliary contact to close, the second contactor coil is momentarily powered, and the main power supply voltage is monitored in real time through the voltage comparator, the abnormal signal triggers the logic controller to output the switching instruction synchronously, avoids the interruption of the PLC control signal, so that no voltage drop is realized in the switching process, the protector and the PLC controller are not affected, and the belt conveyor can continue to run, and the seamless switching ensures the continuous operation of the equipment.
[0015] 2, through the normally closed auxiliary contact of the first contactor in the interlocking control circuit is connected in series to the second contactor coil loop, and the normally closed auxiliary contact of the second contactor is connected in series to the first contactor coil loop, when the main power supply works, the normally closed contact of the first contactor is disconnected, and the backup power supply loop is physically isolated, after switching to the backup power supply, the normally closed contact of the second contactor is disconnected synchronously, and the main power supply loop is blocked, so that interlocking protection is realized, and the problems of short circuit and reverse current caused by parallel connection of double power supplies are avoided. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The utility model discloses a belt conveyor comprehensive protection device double -supply automatic switching device three -dimensional structure schematic diagram shows;
[0017] Figure 2 The utility model discloses a belt conveyor comprehensive protection device double -supply automatic switching device first partial structure schematic diagram shows;
[0018] Figure 3 The utility model discloses a belt conveyor comprehensive protection device double -supply automatic switching device second structure schematic diagram shows;
[0019] Figure 4 The utility model discloses a belt conveyor comprehensive protection device double -supply automatic switching device interlocking control circuit schematic diagram shows.
[0020] Explanation of reference signs: 1, main power supply device; 2, standby power supply device; 3, load power supply interface; 4, voltage sensor; 101, first contactor; 102, second contactor; 103, interlocking control circuit; 201, first isolating switch; 202, first fuse; 203, second isolating switch; 204, second fuse; 401, voltage comparator; 402, logic controller; 5, distribution box. DETAILED DESCRIPTION
[0021] The utility model is further explained in connection with the drawings and examples.
[0022] Please refer to Figure 1 and Figure 2 The utility model provides a kind of example: a belt conveyor comprehensive protection device dual power automatic switching device, including main power supply device 1, standby power supply device 2, switching assembly and load power supply interface 3, main power supply device 1 side is provided with switching assembly, the side of main power supply device 1 is provided with load power supply interface 3, load power supply interface 3 is provided with two groups, two groups of load power supply structure are located at the two sides of main power supply device 1, the input end of main power supply device 1 is sequentially provided with first isolating switch 201 and first fuse 202, the input end of standby power supply device 2 is sequentially provided with second isolating switch 203 and second fuse 204, the output end of main power supply device 1 and standby power supply device 2 is parallelly connected and then is connected to load power supply interface 3 by switching assembly, switching assembly includes interlocking control circuit 103, for automatically switching to standby power supply device 2 when main power supply device 1 is powered off.
[0023] Please refer to Figure 3 and Figure 4In the embodiment, the switching assembly further comprises a first contactor 101 and a second contactor 102, the main contact of the first contactor 101 is connected in series in the output circuit of the main power supply 1, the normally closed auxiliary contact of the first contactor 101 is connected in series with the coil loop of the second contactor 102, the main contact of the second contactor 102 is connected in series in the output circuit of the standby power supply 2, the normally closed auxiliary contact of the second contactor 102 is connected in series with the coil loop of the first contactor 101, forming a mechanical interlocking structure, in the output circuit of the main power supply 1, the main contact of the first contactor 101 and the main contact of the second contactor 102 are connected in series alternately, forming a three-level redundant control, in the output circuit of the standby power supply 2, the main contact of the second contactor 102 and the main contact of the first contactor 101 are connected in series alternately, forming a symmetric redundant control, the power supply circuit of the main power supply 1 and the standby power supply 2 is provided with a voltage sensor 4 connected with the phase line, the voltage sensor 4 is used for monitoring the phase state of the power supply in real time, and triggering the switching assembly to perform switching action when detecting phase failure, in use, through the mechanical interlocking structure of the first contactor 101 and the second contactor 102, when the main power supply fails, the first contactor 101 coil loses power to cause the normally closed auxiliary contact to close, the second contactor 102 coil is momentarily powered, the voltage is monitored in real time by the voltage comparator, the abnormal signal triggers the logic controller 402 to output the switching instruction synchronously, avoiding the interruption of the PLC control signal, so as to realize no voltage drop in the switching process, the protector and the PLC controller are not affected, the belt conveyor can continue to run, and the equipment continuous operation is ensured through seamless switching.
[0024] As preferred, in the interlocking control circuit 103, the normally closed auxiliary contact of the first contactor 101 is connected with the output end of the backup power supply 2 and is connected in series to the coil loop of the second contactor 102, the normally closed auxiliary contact of the second contactor 102 is connected with the output end of the main power supply 1 and is connected in series to the coil loop of the first contactor 101, forming a cross interlocking logic, the side of the load power supply interface 3 is provided with a control assembly, the control assembly comprises a voltage comparator 401 and a logic controller 402, the side of the load power supply interface 3 is provided with the voltage comparator 401, one side of the voltage comparator 401 is provided with the logic controller 402, the voltage comparator 401 is used for collecting the voltage signals of the main power supply 1 and the backup power supply 2 in real time, and when the voltage of the main power supply 1 is lower than a threshold value, the backup power supply 2 is switched to the backup power supply 2 through the logic controller 402, the main power supply 1 and the backup power supply 2 are independently arranged 127V comprehensive protection power supplies, the output ends of the main power supply 1 and the backup power supply 2 are used for being connected with the power input ends of the protector control end and the PLC console of the external belt conveyor through cables, the main power supply 1 is externally provided with a distribution box 5, in use, the normally closed auxiliary contact of the first contactor 101 in the interlocking control circuit 103 is connected in series to the coil loop of the second contactor 102, the normally closed auxiliary contact of the second contactor 102 is connected in series to the coil loop of the first contactor 101, when the main power supply works, the normally closed contact of the first contactor 101 is disconnected, and the backup power supply loop is physically isolated; after switching to the backup power supply, the normally closed contact of the second contactor 102 is synchronously disconnected, and the main power supply loop is blocked, so that the interlocking protection is realized, and the problems of short circuit and reverse current caused by parallel connection of double power supplies are avoided.
[0025] In work, first, the input side first isolating switch 201 of the main power supply 1 and the input side second isolating switch 203 of the backup power supply 2 are closed, so that the main backup power supply is in standby state, the first fuse 202 of the main power supply 1 and the second fuse 204 of the backup power supply 2 are closed, so that the power supply line protection function is ensured to be normal, then the main power supply 1 is started, at this time, the coil of the first contactor 101 is powered, the normally open main contact of the first contactor 101 is closed, the main power supply supplies power to the load through the main contact of the first contactor 101; at the same time, the normally closed auxiliary contact of the first contactor 101 is disconnected, the coil loop of the second contactor 102 of the backup power supply 2 is cut off, and the interlocking is formed.
[0026] When the main power supply works normally, the main power supply 1 continuously outputs 127V control power, the load power supply interface 3 supplies power to the protector of the belt conveyor and the PLC console, the voltage comparator 401 monitors the voltage signal of the main power supply 1 in real time, if the voltage is stable within a threshold range, the current power supply state is maintained, the voltage sensor 4 continuously detects the phase state of the main power supply, if the power supply phase is balanced, no action is triggered.
[0027] When the main power supply is phase failure, voltage sag or fuse blown, the output voltage of the main power supply 1 drops below the threshold, the voltage comparator 401 detects the abnormal signal, the logic controller 402 outputs the switching instruction; at the same time, the voltage sensor 4 triggers the phase failure alarm signal, the first contactor 101 coil of the main power supply 1 loses power, the normally open main contact is disconnected, cutting off the power supply of the main power supply 1; the normally closed auxiliary contact of the first contactor 101 resets and closes, providing a path for the switching of the standby power supply 2, after the normally closed auxiliary contact of the first contactor 101 is closed, the second contactor 102 coil of the standby power supply 2 gets power, the normally open main contact is momentarily closed, the standby power supply 2 supplies power to the load through the main contact of the second contactor 102, the normally closed auxiliary contact of the second contactor 102 is disconnected at the same time, cutting off the first contactor 101 coil loop of the main power supply 1, ensuring the interlocking of the main and standby power supplies, avoiding the conflict of parallel power supply, the voltage of the load power supply interface 3 is maintained by the standby power supply 2, the protector and PLC console continue to run, and the belt conveyor has no shutdown phenomenon;
[0028] When the main power supply is failure, the worker can disconnect the second disconnector 203 of the standby power supply 2, so that the second contactor 102 coil loses power, the second contactor 102 main contact disconnects the standby power supply output, the first disconnector 201 and the first fuse 202 of the main power supply 1 are re-closed, the first contactor 101 coil gets power, the main contact is closed, the main power supply is restored, and the device returns to the initial working state.
[0029] Through the above steps, by using the mechanical interlocking structure of the first contactor 101 and the second contactor 102, when the main power supply is failure, the first contactor 101 coil loses power, causing the normally closed auxiliary contact to close, the second contactor 102 coil momentarily gets power, the voltage comparator is used to monitor the main power supply voltage in real time, the abnormal signal triggers the logic controller 402 to output the switching instruction synchronously, avoiding the interruption of the PLC control signal, so that there is no voltage drop in the switching process, the protector and the PLC controller are not affected, and the belt conveyor can continue to run, and the seamless switching ensures the continuous operation of the equipment.
[0030] The embodiments of the utility model are described in detail above combined with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.
Claims
1. A dual-power automatic switching device for integrated protection of a belt conveyor, comprising a main power supply (1) and a backup power supply (2), characterized in that: It also includes a switching component and a load power supply interface (3). A switching component is provided on one side of the main power supply unit (1), and a load power supply interface (3) is provided on one side of the main power supply unit (1). The load power supply interface (3) is provided in two sets, and the two sets of load power supply structures are located on both sides of the main power supply unit (1). The input end of the main power supply unit (1) is provided with a first isolating switch (201) and a first fuse (202) in sequence. The input end of the backup power supply unit (2) is provided with a second isolating switch (203) and a second fuse (204) in sequence. The output ends of the main power supply unit (1) and the backup power supply unit (2) are connected in parallel and then connected to the load power supply interface (3) through the switching component. The switching component includes an interlock control circuit (103) for automatically switching to the backup power supply unit (2) when the main power supply unit (1) is powered off.
2. The dual-power automatic switching device for a belt conveyor integrated protection system according to claim 1, characterized in that: The switching assembly also includes a first contactor (101) and a second contactor (102). The main contact of the first contactor (101) is connected in series in the output line of the main power supply (1). The normally closed auxiliary contact of the first contactor (101) is connected in series with the coil circuit of the second contactor (102). The main contact of the second contactor (102) is connected in series in the output line of the backup power supply (2). The normally closed auxiliary contact of the second contactor (102) is connected in series with the coil circuit of the first contactor (101), forming a mechanical interlock structure.
3. The dual-power automatic switching device for a belt conveyor integrated protection system according to claim 2, characterized in that: In the output line of the main power supply (1), the main contacts of the first contactor (101) and the main contacts of the second contactor (102) are connected in series alternately to form a three-level redundant control. In the output line of the backup power supply (2), the main contacts of the second contactor (102) and the main contacts of the first contactor (101) are connected in series alternately to form a symmetrical redundant control.
4. The dual-power automatic switching device for a belt conveyor integrated protection system according to claim 1, characterized in that: Both the main power supply unit (1) and the backup power supply unit (2) are equipped with voltage sensors (4) connected to the phase lines. The voltage sensors (4) are used to monitor the phase status of the power supply in real time and trigger the switching component to perform switching action when a phase failure is detected.
5. The dual-power automatic switching device for a belt conveyor integrated protection system according to claim 2, characterized in that: In the interlock control circuit (103), the normally closed auxiliary contact of the first contactor (101) is connected to the output terminal of the backup power supply (2) and connected in series to the coil circuit of the second contactor (102). The normally closed auxiliary contact of the second contactor (102) is connected to the output terminal of the main power supply (1) and connected in series to the coil circuit of the first contactor (101), forming a cross-interlock logic.
6. The dual-power automatic switching device for a belt conveyor integrated protection system according to claim 1, characterized in that: A control component is provided on the side of the load power supply interface (3). The control component includes a voltage comparator (401) and a logic controller (402). The voltage comparator (401) is provided on the side of the load power supply interface (3), and a logic controller (402) is provided on one side of the voltage comparator (401). The voltage comparator (401) is used to collect the voltage signals of the main power supply unit (1) and the backup power supply unit (2) in real time, and when the voltage of the main power supply unit (1) is lower than the threshold, the logic controller (402) drives the switching component to switch to the backup power supply unit (2).
7. The dual-power automatic switching device for a belt conveyor integrated protection system according to claim 1, characterized in that: The main power supply (1) and the backup power supply (2) are independently set 127V integrated protection power supplies. The output terminals of the main power supply (1) and the backup power supply (2) are used to connect to the protection control terminal of the external belt conveyor and the power input terminal of the PLC console via cables. The main power supply (1) is equipped with a distribution box (5).