Combined feed switch

Abstract

The utility model relates to the technical field of control switches, in particular to a combined feed switch, which comprises an explosion-proof shell, a PLC (programmable logic controller) control system, a starting unit, a protection unit and a display unit, and is characterized in that the PLC control system is electrically connected with the starting unit and the display unit respectively and is also electrically connected with an upper computer; the starting unit is connected with an external circuit system through the protection unit and is also externally connected with a power supply; the system further comprises a monitoring unit, the monitoring unit comprises a plurality of remote monitoring modules, and each explosion-proof lamp is correspondingly provided with one remote monitoring module. The remote monitoring module comprises a single-chip microcomputer, a photoelectric coupler, a power module and a dial switch, the single-chip microcomputer is connected with the power module and the PLC control system, and the photoelectric coupler and the dial switch are connected with the single-chip microcomputer. The explosion-proof lamp is provided with the remote monitoring module, so that the state of the explosion-proof lamp is monitored in real time, the explosion-proof lamp and electrical equipment of a tunneling face in the area are jointly controlled, and the safety of underground operation is improved.

Description

Technical Field

[0001] This utility model relates to the field of control switch technology, and in particular to a combined power supply switch. Background Technology

[0002] With the completion of electrification upgrades in underground coal mines, various electrical equipment and motors have emerged in large numbers. Feeder switches are no longer simply used as distribution switches in mobile substations or as the main switch of the power distribution system; they are frequently used as combination switches to control electrical equipment. Currently, monitoring of lighting systems in underground coal mines still mainly relies on manual monitoring.

[0003] Patent CN219980259U discloses a mine-use explosion-proof and intrinsically safe low-voltage permanent magnet vacuum power supply switch, including an explosion-proof housing. Inside the explosion-proof housing are a circuit protection unit, a vacuum circuit breaker, a PLC control system, a Chinese character display LCD screen, and a power supply circuit for powering the components within the explosion-proof housing. The Chinese character display LCD screen is connected to the PLC control system. The protection unit includes a current transformer and a leakage current protection circuit. The output terminals of the three-phase current transformer are respectively connected to the IA, IB, and IC terminals of the PLC control system. The leakage current protection circuit includes a three-phase reactor connected to ground and connected to the external power grid line in sequence, and a rated current protection circuit. The system includes a current-voltage reactor and a sampling resistor. The UO terminal of the current-voltage reactor is connected to the UO terminal of the PLC control system, and the 3M terminal of the current-voltage reactor is connected to the 3M terminal of the PLC control system. One end of the sampling resistor is grounded, and the other end is connected to the RL terminal of the PLC control system. The system also includes a centralized control power supply circuit, the output of which is connected to the centralized control platform power supply device. This centralized control power supply circuit includes a transformer connected to the external power grid, and the transformer is connected to a contactor. A second current transformer is also provided on the centralized control power supply circuit, and its output is connected to the 2M and UA terminals of the PLC control system. While the power supply switch disclosed in this patent can provide overload, short circuit, phase loss, leakage, undervoltage, and overvoltage fault protection for the overall lighting system, it cannot determine the location of the faulty explosion-proof light when it malfunctions at a certain location on the tunnel face. This results in the inability to accurately control the automatic power cut-off of other electrical equipment in the lighting fault area, posing a certain safety hazard. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a combined power supply switch, which enables the lighting system to be controlled in conjunction with the electrical equipment within the lighting area. This solves the problem that the electrical equipment in the area cannot be automatically powered off due to a lighting system malfunction, thereby improving the safety of underground operations.

[0005] To achieve this technical objective, the present invention adopts the following solution:

[0006] A combined power supply switch includes an explosion-proof housing, a PLC control system, a starting unit, a protection unit, and a display unit. The PLC control system is electrically connected to the starting unit and the display unit, and is also electrically connected to a host computer. The starting unit is connected to an external circuit system through the protection unit and is also connected to an external power supply. The switch also includes a monitoring unit, which includes several remote monitoring modules. Each explosion-proof light is equipped with one remote monitoring module to monitor the status of the explosion-proof light.

[0007] The remote monitoring module includes a microcontroller, an optocoupler, a power supply module, and a DIP switch. The microcontroller is connected to both the power supply module and the PLC control system, while the optocoupler and the DIP switch are connected to the microcontroller.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] This invention installs a monitoring module for each explosion-proof light to monitor its status. The explosion-proof light is then connected to other electrical equipment on the tunnel face via a power supply switch. When a lighting fault occurs in the explosion-proof light, the power supply switch can precisely cut off the power to the electrical equipment in the area of ​​the lighting fault, thus preventing safety accidents.

[0010] Furthermore, the preferred embodiment of this utility model is as follows:

[0011] The microcontroller model is STC8F2K16S2-16P.

[0012] The optocoupler used is Everlight's EL357N SMD optocoupler SOP-4. The RO terminal of the optocoupler is connected to the P1.0 terminal of the microcontroller, and the DI terminal of the optocoupler is connected to the P1.1 terminal of the microcontroller.

[0013] The DIP switch is a six-bit DIP switch based on binary principles, with a minimum DIP address of 0 and a maximum of 64.

[0014] The microcontroller is connected to the PLC control system via a 485 bus.

[0015] The remote monitoring module also includes a reset switch, which is connected to the microcontroller. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the framework of this utility model;

[0017] Figure 2 This is a diagram of the frame structure of the detection unit;

[0018] Figure 3 This is a framework diagram of the remote monitoring module;

[0019] Figure 4This is a flowchart illustrating the present invention.

[0020] Figure 5 This is the circuit diagram for the remote monitoring module;

[0021] The following are labeled in the diagram: 1. Microcontroller; 2. Optocoupler; 3. Power module; 4. DIP switch; 5. Reset switch. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] A combined power supply switch comprises an explosion-proof housing, a PLC control system, a starting unit, a protection unit, a display unit, and a monitoring unit. The PLC control system is electrically connected to the starting unit and the display unit, and is also electrically connected to a host computer. The starting unit is connected to an external circuit system through the protection unit, and is also powered by an external power source.

[0024] The monitoring unit consists of several remote monitoring modules. Each remote monitoring module consists of a microcontroller 1, an optocoupler 2, a power supply module 3, and a DIP switch 4. The microcontroller 1 is connected to the power supply module 3 and the PLC control system, and the optocoupler 2 and the DIP switch 4 are connected to the microcontroller 1. The remote monitoring module also includes a reset switch 5, which is connected to the microcontroller 1.

[0025] In this embodiment, the microcontroller 1 is model STC8F2K16S2-16P, and the optocoupler is Everlight EL357N SMD optocoupler SOP-4. The RO terminal of optocoupler 2 is connected to the P1.0 terminal of microcontroller 1, and the DI terminal of optocoupler 2 is connected to the P1.1 terminal of microcontroller 1. Microcontroller 1 reads the P1.1 pin to determine whether the explosion-proof lamp is lit. The DIP switch 4 is a six-bit binary principle DIP switch, with a minimum address of 0 and a maximum address of 64. The remote monitoring module is numbered through the DIP switch 4, and the microcontroller 1 communicates with the PLC control system through a daisy-chain connection via RS-485. The PLC control system can monitor up to 64 explosion-proof lamps.

[0026] Reset switch 5 is connected to the P5.4 terminal of microcontroller 1. When the explosion-proof light malfunctions, the remote monitoring module can only be restarted after a manual reset.

[0027] In this invention, each remote monitoring module is numbered using a DIP switch 4, and then each remote monitoring module is connected to the PLC control system using a daisy-chain connection. The microcontroller 1 determines whether the explosion-proof lamp is lit by reading the P1.1 pin, and communicates with the PLC control system via the 485 bus to inform the PLC control system of the current status of the explosion-proof lamps in each branch.

[0028] When the explosion-proof lights on a branch are lit normally, the optocoupler 2 is triggered to conduct and introduce 5V DC voltage. The microcontroller 1 determines that the explosion-proof lights are lit by reading the P1.1 pin and communicates with the PLC control system via the 485 bus to inform the PLC control system that the explosion-proof lights on each branch are lit normally. The PLC control system then controls the electrical equipment on the tunnel face corresponding to the lighting of each branch to start normally. When the explosion-proof lights on a branch fail to light up, the optocoupler 2 is not conducted. The microcontroller communicates with the PLC control system via the 485 bus to inform the PLC control system of the branch number where the explosion-proof lights are not lit. The PLC control system determines whether there is electrical equipment on the tunnel face in the area illuminated by the faulty explosion-proof light. If there is no electrical equipment on the tunnel face, a lighting alarm is output. If there is electrical equipment on the tunnel face, the PLC control system cuts off the main circuit, stops supplying power to the electrical equipment on the tunnel face in that lighting area, and outputs an alarm.

[0029] In this embodiment, the PLC control system and the display unit are connected and interact with each other via a RS-232 bus, and the PLC control system and the host computer are connected and interact with each other via a twisted-pair cable. By setting up the RS-232 bus, it is convenient to electrically connect the PLC control system and the display unit. The display unit displays the system operating status, system parameter settings, and alarm information. By setting up the twisted-pair cable, the host computer can send commands to the power supply switch and input new commands according to user needs to modify or add new functions.

[0030] In this embodiment, a PLC control system centered on the RPC 2107 programmable logic controller and RPC2231 expansion module manufactured by Beijing Lanpufeng Technology Co., Ltd. is used. The PLC control system is connected to the protection unit. The protection unit converts the voltage and current of the branch circuits connected to the switch into digital signals and transmits them to the PLC control system to realize the opening and closing control of each branch circuit on the tunnel face.

[0031] The starting unit consists of a bistable permanent magnet circuit breaker and a transformer. The transformer converts the input voltage into the voltage required by the centralized protection device. The feeder input voltage and the centralized protection device voltage are respectively connected to the bistable permanent magnet circuit breaker, and the circuit breaker is controlled by a PLC control system. When a lighting fault occurs, the PLC control system controls the starting unit to cut off the branch circuits of the electrical equipment in the lighting area, thereby de-energizing the electrical equipment on the tunnel face in the lighting fault area.

[0032] The protection unit consists of a current transformer, a voltage transformer, a zero-sequence voltage leakage protection device, and an additional DC leakage protection device. The current transformer facilitates the acquisition of output current. By monitoring the output current, abnormal phenomena such as overload or phase loss are detected, and the system stops operating to prevent equipment damage. Similarly, the voltage transformer facilitates the acquisition of output voltage. By monitoring the output voltage, abnormal phenomena such as undervoltage or overvoltage are detected, and the system stops operating to prevent equipment damage. The additional DC leakage protection device detects leakage current in the DC voltage across the sampling resistor and provides leakage protection to prevent equipment damage. The zero-sequence voltage leakage protection device consists of a three-phase reactor and a choke reactor. When a branch circuit leaks current, the current returning from the center point of the three-phase reactor passes through the choke reactor and enters the PLC control system. The PLC control system then cuts off the branch circuit output for leakage protection.

[0033] The connection relationship between the start-up unit, protection unit, and PLC control system in this embodiment, as well as the functions and principles for providing leakage, overload, short circuit, and overload protection for the control return, are existing technologies and will not be repeated here.

[0034] This utility model adds a remote monitoring module to monitor each explosion-proof light individually, enabling the combined power supply switch to have both conventional power supply function and lighting system detection function. It interlocks the lighting system with the electrical equipment on the tunnel face of the corresponding lighting area, effectively solving the problem that when a lighting system fails, other electrical equipment in that area cannot be automatically powered off, greatly improving the safety for customers.

[0035] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A combined power supply switch, comprising an explosion-proof housing, a PLC control system, a starting unit, a protection unit, and a display unit, wherein the PLC control system is electrically connected to the starting unit and the display unit respectively, and is also electrically connected to a host computer; the starting unit is connected to an external circuit system through the protection unit, and is also connected to an external power supply; characterized in that: It also includes a monitoring unit, which consists of several remote monitoring modules. Each explosion-proof light is equipped with one remote monitoring module to monitor the status of the explosion-proof light. The remote monitoring module includes a microcontroller, an optocoupler, a power supply module, and a DIP switch. The microcontroller is connected to both the power supply module and the PLC control system, while the optocoupler and the DIP switch are connected to the microcontroller.

2. The combined feeder switch according to claim 1, characterized in that: The microcontroller model is STC8F2K16S2-16P.

3. The combined feeder switch according to claim 2, characterized in that: The optocoupler used is Everlight's EL357N SMD optocoupler SOP-4. The RO terminal of the optocoupler is connected to the P1.0 terminal of the microcontroller, and the DI terminal of the optocoupler is connected to the P1.1 terminal of the microcontroller.

4. The combined feeder switch according to claim 1, characterized in that: The DIP switch is a six-bit DIP switch based on binary principles, with a minimum DIP address of 0 and a maximum of 64.

5. The combined feeder switch according to claim 1, characterized in that: The microcontroller is connected to the PLC control system via a 485 bus.

6. The combined feeder switch according to claim 1, characterized in that: The remote monitoring module also includes a reset switch, which is connected to the microcontroller.

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