Intrinsic safety pilot control module for remote start and stop of mine motor based on single chip microcomputer

Abstract

The utility model provides an intrinsic safety pilot control module for remote start and stop of a mine motor based on a single-chip microcomputer, and belongs to the field of mine protection devices. The problems of alternating-current voltage fluctuation, incomplete protection, self-starting and the like of the practical intrinsic safety pilot control module for remotely starting and stopping the underground motor during use are solved; comprising a body control module and a remote control module, the body control module comprises an intrinsic safety power supply circuit, a pilot circuit module, a central control module and a state indication circuit, the pilot circuit module comprises a voltage stabilizing circuit, an isolation transformer circuit, an optical coupler isolation circuit and a relay circuit, and the voltage stabilizing circuit is connected with the optical coupler isolation circuit. The start-stop signal conversion module is used for converting a start-stop signal into a start-stop direct current signal, the optocoupler isolation circuit is connected with the remote control module and is used for isolating the start-stop signal and representing the state, and the relay circuit is connected with the field contactor and is used for processing the start-stop state signal and outputting the start-stop state signal to control the start-stop of the mine motor; the utility model is applied to mine motors.

Description

Technical Field

[0001] The utility model provides an intrinsically safe pilot control module for remote start and stop of a mine motor based on a single chip computer, belonging to the technical field of mine protection devices. Background Art

[0002] Underground mines are characterized by narrow spaces, poor heat dissipation, humid air, and the presence of flammable and explosive gas and coal dust. In this special production environment, intrinsically safe pilot modules are required to control the start and stop of switchgear. The main functions of intrinsically safe pilot control modules are reflected in the following aspects:

[0003] Electrical Control: This module is typically used in electrical control systems, particularly those requiring intrinsic safety. It converts a pilot signal (such as a pushbutton operation signal) into a safe output control point for remote or automated electrical control.

[0004] Signal conversion and isolation: In complex electrical control systems, intrinsically safe pilot control modules process signals from various sources and convert them into a form suitable for processing within the system. They also provide the necessary signal isolation to ensure electrical independence between system components, preventing electrical interference and fault propagation.

[0005] Safety protection: Due to its intrinsically safe design, the module can prevent the generation of electrical sparks and high temperatures to a certain extent, thereby reducing the risk of fire or explosion in flammable and explosive environments. This is particularly important in places such as coal mines and chemical plants where explosive mixtures are present.

[0006] System Integration: Intrinsically safe pilot control modules typically feature standard communication interfaces and protocols (such as RS485 and Modbus-RTU), enabling easy integration with other electrical control equipment and systems to exchange and share data. This helps enhance the automation and intelligence of the entire electrical control system.

[0007] However, the current intrinsically safe pilot control module used for remote start and stop of underground motors may experience problems such as AC voltage fluctuations, incomplete protection, and self-starting during use, resulting in the inability to guarantee the safety and reliability of remote start and stop of motors in actual applications. Therefore, it is necessary to improve the circuit part of the existing intrinsically safe pilot control module. Utility Model Content

[0008] In order to overcome the deficiencies in the prior art, the utility model aims to solve the technical problem of providing an improvement in the hardware structure of an intrinsically safe pilot control module for remote start and stop of a mine motor based on a single chip microcomputer.

[0009] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a single-chip microcomputer-based intrinsically safe pilot control module for remote start and stop of mine motors, including a main control module and a remote control module, the main control module including an intrinsically safe power supply circuit, a pilot circuit module, a central control module and a status indication circuit, the intrinsically safe power supply circuit is used to supply power to the pilot circuit module and the central control module, the pilot circuit module includes a voltage stabilizing circuit, an isolation transformer circuit, an optocoupler isolation circuit and a relay circuit, the input end of the isolation transformer circuit is connected to the intrinsically safe power supply circuit, and the output end of the isolation transformer circuit is connected to the voltage stabilizing circuit;

[0010] The voltage stabilizing circuit is connected to the optocoupler isolation circuit, which is used to convert the start-stop signal into a start-stop DC signal. The optocoupler isolation circuit is connected to the remote control module, which is used to isolate the start-stop signal and characterize the state. The relay circuit is connected to the on-site contactor, which is used to process the start-stop state signal and output the start-stop state signal, thereby controlling the start and stop of the mine motor;

[0011] The central control module includes a controller and a mode selection dial circuit. The controller is connected to the mode selection dial circuit and is used to select the working mode and receive and process the start and stop DC signal output by the relay circuit;

[0012] The state indication circuit includes an LED lamp and a DIP switch, which are used to indicate the relay state, working state and short circuit state;

[0013] The remote control module is connected to the connection terminals of the main control module.

[0014] The remote control module includes a remote button box, which is provided with a knob switch for controlling the start and stop of the motor. The remote button box is connected to the connection terminals of the main control module through wires.

[0015] The intrinsically safe power supply circuit includes an anti-reverse connection circuit and a protection circuit.

[0016] The isolation transformer circuit includes a transformer T / P / A, a rectifier bridge, a capacitor CP2A, a capacitor CP3A, a capacitor CP4A, a transistor QP1A, a transistor QP2A, a resistor RP1A, a resistor RP2A and a power supply V1; the two ends of the primary winding of the transformer T / P / A are respectively connected to the capacitor CP2A and the capacitor CP3A and then cross-connected in series with the capacitor CP4A; the two ends of the primary winding of the transformer T / P / A are also respectively connected to the collectors of the transistor QP1A and the transistor QP2A, and the transistor QP 1A and the base of transistor QP2A are connected to the two ends of capacitor CP4A respectively, and the resistor RP1A is connected in series with the resistor RP2A and then connected to the two ends of capacitor CP4A respectively. The conductive path of the resistor RP1A and the resistor RP2A in series is connected to the power supply V1; the secondary winding of the transformer T / P / A is connected to the rectifier bridge; the rectifier bridge is composed of DA1, DA2, DA3 and DA4, one end of the secondary winding is connected to pin 1 of DA1 and pin 2 of DA3, and the other end is connected to pin 1 of DA2 and pin 2 of DA4.

[0017] The optocoupler isolation circuit includes a resistor RA14, an optocoupler isolation chip ICK2A, a resistor RK7A, a resistor RK8A, a diode VK1A, a diode VK2A and a transistor VK3A. The optocoupler isolation chip ICK2A includes a light-emitting diode and a phototransistor. The positive electrode of the light-emitting diode of the optocoupler isolation chip ICK2A is connected to the resistor RA14 and then to the pin 25 of the controller. The negative electrode of the light-emitting diode of the optocoupler isolation chip ICK2A is grounded. The emitter of the phototransistor of the optocoupler isolation chip ICK2A is connected in parallel to the resistor One end of RA7A and one end of resistor RA8A, the other end of resistor RA7A is connected to the base of transistor VK3A, the other end of resistor RA8A is grounded, the emitter of transistor VK3A is grounded, the collector of transistor VK3A is connected in parallel to the positive electrode of diode VK1A, the positive electrode of diode VK2A, and one end of the relay coil, the cathode of diode VK1A is connected in parallel to the negative electrode of diode VK2A and the other end of the relay coil and then connected to power supply V1; the collector of the phototransistor in the optocoupler isolation chip ICK2A is connected to the external power supply V1.

[0018] The relay circuit includes a relay JDQA, the coil of the relay JDQA is connected to the optocoupler isolation circuit, and the contacts of the relay JDQA serve as wiring terminals of the intrinsically safe pilot module and are connected to corresponding buttons in the remote control button box.

[0019] The voltage stabilizing circuit includes a first voltage stabilizing unit and a second voltage stabilizing unit. The first voltage stabilizing unit includes a capacitor CA9, a capacitor CA10, an inductor LA1 and a voltage stabilizing tube ICA5. The voltage stabilizing tube ICA5 has pins 1, 2 and 3. Pin 3 of the voltage stabilizing tube ICA5 is connected to VCC. Pin 1 of the voltage stabilizing tube ICA5 is connected in parallel to one end of the capacitor CA9 and one end of the inductor LA1. The other end of the capacitor CA9 is connected in parallel to the other end of the capacitor CA10 and then to ground. The other end of the inductor LA1 is connected in parallel to the other end of the capacitor CA10 and then to the VDD power supply. The second voltage stabilizing unit The element includes a voltage regulator tube ICA4, a capacitor CA8, a capacitor CA7, and a capacitor CA6. The voltage regulator tube ICA4 has pin 1, pin 2, and pin 3. Pin 1 of the voltage regulator tube ICA4 is connected to one end of the capacitor CA8 and is connected to the VCC power supply. Pin 2 of the voltage regulator tube ICA4 is connected in parallel to the other end of the capacitor CA8 and then to ground. Pin 3 of the voltage regulator tube ICA4 is connected in parallel to one end of the capacitor CA6, one end of the capacitor CA7, pin 2 of DA1, and pin 2 of DA2. The other end of the capacitor CA7 and the other end of the capacitor CA8 are connected in parallel to pin 1 of DA3 and pin 1 of DA4 and then to ground.

[0020] The controller adopts a single chip microcomputer of model PIC16F873A.

[0021] The voltage regulator tube ICA5 and the voltage regulator tube ICA4 adopt 78L12 chips.

[0022] The optical coupler isolation chip ICK2A adopts a PC817 type optical coupler isolator.

[0023] The beneficial effects of the present invention compared to the prior art are as follows: the present invention provides an intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer, which adopts single-chip microcomputer control and optoelectronic isolation to isolate the input, output and power supply from each other, so there is no need for a system grounding line, which greatly enhances the stability and anti-interference ability of the detection and control loop signals, thereby improving the reliability of the overall system, and greatly reduces the requirements for instruments in hazardous areas, which also brings great convenience to on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a circuit block diagram of the utility model;

[0026] Figure 2 This is the principle diagram of the intrinsically safe power supply circuit, isolation transformer circuit, and voltage stabilizing circuit of the utility model;

[0027] Figure 3 This is the principle diagram of the central control module and optocoupler isolation circuit of the utility model;

[0028] Figure 4 This is the circuit principle diagram of the remote control button box of the utility model;

[0029] Figure 5 This is the wiring diagram of the two-channel input and two-channel output of the utility model. DETAILED DESCRIPTION

[0030] like Figures 1 to 5 As shown, the utility model provides an intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer, including a main control module and a remote control module. The main control module includes:

[0031] Intrinsically safe power supply circuit, including anti-reverse connection circuit and protection circuit;

[0032] The pilot circuit module includes a voltage stabilizing circuit, an isolation transformer circuit, an optocoupler isolation circuit, and a relay circuit. The input end of the isolation transformer circuit is connected to the intrinsically safe power supply circuit, and the output end of the isolation transformer circuit is connected to the input end of the voltage stabilizing circuit, which is used to stabilize, rectify, and filter the input power supply signal; the voltage stabilizing circuit is connected to the optocoupler isolation circuit to convert the start-stop signal into a start-stop DC signal; the optocoupler isolation circuit is connected to the remote button box to isolate the start-stop signal and represent the status; the relay circuit is connected to the on-site contactor to process the start-stop status signal and output the start-stop status signal, thereby controlling the start and stop of the mine motor;

[0033] The central control module includes a controller based on a PIC16F chip and a mode selection dial circuit. The controller is connected to the mode selection dial circuit to select the working mode and receive and process the start and stop DC signals output by the relay circuit;

[0034] The status indication circuit includes an LED light and a dip switch, which is used to indicate the relay status, working status and short circuit status.

[0035] The remote control module includes a remote button box, which is connected to the terminals of the intrinsically safe pilot module. The remote button box is provided with a knob switch for controlling the start and stop of the motor.

[0036] The intrinsically safe power supply module is connected to the pilot circuit module to supply power to the intrinsically safe pilot module.

[0037] The intrinsically safe power supply is a 24V DC power supply, including an anti-reverse connection circuit and a protection circuit. The protection circuit is connected to a resettable fuse F1, which has the dual functions of overcurrent and overheat protection and automatic recovery. The main function of self-recovery is to protect against overload and short circuit. When the circuit current is too large, the fuse will disconnect. After the circuit current returns to normal, the fuse will recover and enter a low-resistance state to conduct the circuit, and the circuit will be powered normally. The protection circuit includes resistor R1, resettable fuse F1, p6ke47 diode, capacitor CP, inductor LP, capacitor CP1; the resettable fuse is connected in series in the 24V positive circuit; pin 1 of the resettable fuse is connected to the external 24V power supply, and pin 2 of the resettable fuse F1 is connected in series with resistor R1 and then electrically connected to pin 1 of the p6ke47 diode, and pin 2 of the p6ke47 diode is grounded;

[0038] The anti-reverse connection circuit is a VP diode. Pin 1 of the VP diode is connected in parallel with one end of the resistor R1 and one end of the p6ke47 diode. Pin 2 of the VP diode is connected in parallel with one end of the capacitor CP and one end of the inductor LP. The other end of the capacitor CP is connected in parallel with one end of the capacitor CP1 and then to the ground. The other end of the capacitor CP1 is connected in parallel with the other end of the inductor LP and then to the power supply.

[0039] The isolation transformer circuit includes a transformer T / P / A, a rectifier bridge, a capacitor CP2A, a capacitor CP3A, a capacitor CP4A, a transistor QP1A, a transistor QP2A, a resistor RP1A, a resistor RP2A and a power supply V1; the two ends of the primary winding of the transformer T / P / A are respectively connected to the capacitors CP2A and CP3A and then cross-connected in series with the capacitor CP4A; the two ends of the primary winding of the transformer T / P / A are also respectively connected to the collectors of the transistors QP1A and QP2A, and the transistors QP1A and QP2A. A. The base of transistor QP2A is connected to both ends of capacitor CP4A. Resistor RP1A is connected in series with resistor RP2A, and then connected to both ends of capacitor CP4A. The conductive path of resistors RP1A and RP2A in series is connected to power supply V1. The secondary winding of transformer T / P / A is connected to a rectifier bridge. The rectifier bridge is composed of DA1, DA2, DA3, and DA4. One end of the secondary winding is connected to pin 1 of DA1 and pin 2 of DA3, and the other end is connected to pin 1 of DA2 and pin 2 of DA4.

[0040] The transformer T / P / A adopts EE16 type transformer.

[0041] The voltage stabilizing circuit includes a first voltage stabilizing unit and a second voltage stabilizing unit. The first voltage stabilizing unit includes a capacitor CA9, a capacitor CA10, an inductor LA1 and a voltage stabilizing tube ICA5. The voltage stabilizing tube ICA5 has pins 1, 2 and 3. Pin 3 of the voltage stabilizing tube ICA5 is connected to VCC. Pin 1 of the voltage stabilizing tube ICA5 is connected in parallel to one end of the capacitor CA9 and one end of the inductor LA1. The other end of the capacitor CA9 is connected in parallel to the other end of the capacitor CA10 and then to ground. The other end of the inductor LA1 is connected in parallel to the other end of the capacitor CA10 and then to the VDD power supply. The second voltage stabilizing unit It includes a voltage regulator tube ICA4, a capacitor CA8, a capacitor CA7, and a capacitor CA6. The voltage regulator tube ICA4 has pin 1, pin 2, and pin 3. Pin 1 of the voltage regulator tube ICA4 is connected to one end of the capacitor CA8 and is connected to the VCC power supply. Pin 2 of the voltage regulator tube ICA4 is connected in parallel to the other end of the capacitor CA8 and then to ground. Pin 3 of the voltage regulator tube ICA4 is connected in parallel to one end of the capacitor CA6, one end of the capacitor CA7, pin 2 of DA1, and pin 2 of DA2. The other end of the capacitor CA7 and the other end of the capacitor CA8 are connected in parallel to pin 1 of DA3 and pin 1 of DA4 and then to ground.

[0042] The voltage regulator ICA5 and ICA4 use 78L12 chips.

[0043] The optocoupler isolation circuit includes resistor RA14, optocoupler isolation chip ICK2A, resistor RK7A, resistor RK8A, diode VK1A, diode VK2A and transistor VK3A. The optocoupler isolation chip ICK2A includes a light-emitting diode and a phototransistor. The input end of the optocoupler isolation chip ICK2A is the positive end of the light-emitting diode, and the output end is the emitter of the phototransistor. The positive electrode of the light-emitting diode of the optocoupler isolation chip ICK2A is connected to resistor RA14 and then to pin 25 of the controller. The negative electrode of the light-emitting diode of the optocoupler isolation chip ICK2A is grounded. The emitter of the phototransistor of the optocoupler isolation chip ICK2A is connected in parallel to one end of the resistor RA7A and one end of the resistor RA8A. The other end of the resistor RA7A is connected to the base of the transistor VK3A. The other end of the resistor RA8A is grounded. The emitter of the transistor VK3A is grounded. The collector of the transistor VK3A is connected in parallel to the positive electrode of the diode VK1A, the positive electrode of the diode VK2A, and one end of the relay coil. The negative electrode of the diode VK1A is connected in parallel to the negative electrode of the diode VK2A and the other end of the relay coil and then to the power supply V1. The collector of the phototransistor in the optocoupler isolation chip ICK2A is connected to the external power supply V1.

[0044] The relay circuit includes a relay JDQA, a coil of the relay JDQA is connected to an optocoupler isolation circuit, and contacts of the relay JDQA serve as terminals of an intrinsically safe pilot module and are connected to corresponding buttons in a remote control button box.

[0045] The remote button box includes a remote start button, a remote stop button and a diode; QT1+, QT1-, 2COM and 2NO in the intrinsically safe pilot module terminals are respectively connected to the diode pin 1, stop button pin 1, start-stop button common terminal and diode pin 2 and start button pin 2 in the remote button box.

[0046] The controller ICA3 adopts the PIC16F873A single chip microcomputer, and the pin 2 of the controller ICA3 is connected to the mode dial selection circuit.

[0047] The isolation implementation principle of the present utility model is as follows:

[0048] The power supply is isolated by a transformer, model EE16-101 (codename T / P / A). The signal is isolated by an optoelectronic isolation chip, model PC817 (codename ICK2A).

[0049] The control principle of this utility model is as follows:

[0050] The main control module and the remote control module use intrinsically safe signal communication, and the main control module actively detects the status signal of the remote control module;

[0051] After the main control module detects the status signal of the remote control module, it determines the mode information according to the position of the dial switch. The mode information is divided into M1 and M2, and uploads the status information;

[0052] The main control module monitors the status information sent by the remote control module, monitors the communication control cable through the status information monitoring, and determines whether the communication control cable has a fault, further including: the main control module starts the status information monitoring program to monitor whether the status information is normal. If it is monitored that the status information is received, the remote opening and closing operation is performed according to the status information; if it is monitored that the status information is not received, the main control module quickly sends query status information to the remote control module to monitor whether the information interaction of the communication control cable is normal. When it is monitored that the information interaction of the communication control cable is abnormal, the main control module quickly trips the starter and displays the status information through the status indicator light.

[0053] like Figure 5 As shown, this embodiment provides a wiring diagram for two switching inputs and two switching outputs. Each channel corresponds to a relay output, and a DIP switch sets the operating mode to either actuate or deactivate if the wires are damaged and short-circuited. Isolation separates the hazardous and safe zone signals, enabling the conversion of intrinsically safe circuits to non-intrinsically safe circuits. The input and output channels are independent, with the input circuit being intrinsically safe and compliant with Ex ib I, while the output circuit is non-intrinsically safe. A semiconductor diode or a 100Ω-200Ω resistor can be connected in series with the input switch to detect the switch state.

[0054] The circuit of the utility model is fixed inside the safety barrier, and the safety barrier is provided with 2-channel input terminals, 2-channel output terminals, power supply terminals, and 2-channel working mode selection dial switches. It is also provided with a green light indicating power supply, two yellow lights indicating the action of the 1-channel and 2-channel input relays, and two red lights indicating the short circuit of the 1-channel and 2-channel input lines.

[0055] Under normal circumstances, when the DIP switch for channel 1 is in the "OFF" position, when the input switch is closed, the output relay contacts close, and the yellow indicator light comes on. When the input wire or diode is short-circuited, the red indicator light comes on, the output relay contacts do not operate, and the yellow indicator light goes off. If the DIP switch for channel 1 is in the "ON" position, when the input switch is closed, the output relay contacts close, and the yellow indicator light comes on. When the input wire or diode is short-circuited, the red indicator light comes on, the output relay contacts close, and the yellow indicator light comes on. The operating process of channel 2 is the same as that of channel 1.

[0056] In the present utility model, because the intrinsically safe power supply is combined with the anti-reverse connection circuit and the protection circuit, the remote button box is connected to the terminal of the intrinsically safe pilot module, and the pilot circuit module is combined with the isolation transformer circuit, the optocoupler isolation circuit, the voltage stabilizing circuit and the relay JDQ scheme to achieve the safety and reliability of the remote start and stop operation of the mine motor. When the cable is short-circuited at the start and stop point, the optocoupler does not operate, preventing the equipment from starting by mistake, thereby solving the problems of AC voltage fluctuation, incomplete protection, and self-starting of the intrinsically safe pilot circuit in the prior art.

[0057] Regarding the specific structure of the present invention, it should be noted that the connection relationship between the various component modules adopted in the present invention is definite and feasible. Except for the special instructions in the embodiments, the specific connection relationship can bring about corresponding technical effects and solve the technical problems raised by the present invention without relying on the execution of the corresponding software program. The components, modules, models of specific components appearing in the present invention, the connection methods between each other, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, except for the specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technology and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete, and feasible, and the corresponding physical products can be reproduced or obtained based on this technical means.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-chip microcomputer-based intrinsically safe pilot control module for remote start and stop of mine motors, characterized by: It includes a main control module and a remote control module. The main control module includes an intrinsically safe power supply circuit, a pilot circuit module, a central control module and a status indication circuit. The intrinsically safe power supply circuit is used to supply power to the pilot circuit module and the central control module. The pilot circuit module includes a voltage stabilizing circuit, an isolation transformer circuit, an optocoupler isolation circuit and a relay circuit. The input end of the isolation transformer circuit is connected to the intrinsically safe power supply circuit, and the output end of the isolation transformer circuit is connected to the voltage stabilizing circuit. The voltage stabilizing circuit is connected to the optocoupler isolation circuit, which is used to convert the start-stop signal into a start-stop DC signal. The optocoupler isolation circuit is connected to the remote control module, which is used to isolate the start-stop signal and characterize the state. The relay circuit is connected to the on-site contactor, which is used to process the start-stop state signal and output the start-stop state signal, thereby controlling the start and stop of the mine motor; The central control module includes a controller and a mode selection dial circuit. The controller is connected to the mode selection dial circuit and is used to select the working mode and receive and process the start and stop DC signal output by the relay circuit; The state indication circuit includes an LED lamp and a DIP switch, which are used to indicate the relay state, working state and short circuit state; The remote control module is connected to the connection terminals of the main control module.

2. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 1, characterized in that: The remote control module includes a remote button box, which is provided with a knob switch for controlling the start and stop of the motor. The remote button box is connected to the connection terminals of the main control module through wires.

3. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 1, characterized in that: The intrinsically safe power supply circuit includes an anti-reverse connection circuit and a protection circuit.

4. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 1, characterized in that: The isolation transformer circuit includes a transformer T / P / A, a rectifier bridge, a capacitor CP2A, a capacitor CP3A, a capacitor CP4A, a transistor QP1A, a transistor QP2A, a resistor RP1A, a resistor RP2A and a power supply V1; the two ends of the primary winding of the transformer T / P / A are respectively connected to the capacitor CP2A and the capacitor CP3A and then cross-connected in series with the capacitor CP4A; the two ends of the primary winding of the transformer T / P / A are also respectively connected to the collectors of the transistor QP1A and the transistor QP2A, and the transistor QP 1A and the base of transistor QP2A are connected to the two ends of capacitor CP4A respectively, and the resistor RP1A is connected in series with the resistor RP2A and then connected to the two ends of capacitor CP4A respectively. The conductive path of the resistor RP1A and the resistor RP2A in series is connected to the power supply V1; the secondary winding of the transformer T / P / A is connected to the rectifier bridge; the rectifier bridge is composed of DA1, DA2, DA3 and DA4, one end of the secondary winding is connected to pin 1 of DA1 and pin 2 of DA3, and the other end is connected to pin 1 of DA2 and pin 2 of DA4.

5. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 1, characterized in that: The optocoupler isolation circuit includes a resistor RA14, an optocoupler isolation chip ICK2A, a resistor RK7A, a resistor RK8A, a diode VK1A, a diode VK2A and a transistor VK3A. The optocoupler isolation chip ICK2A includes a light-emitting diode and a phototransistor. The positive electrode of the light-emitting diode of the optocoupler isolation chip ICK2A is connected to the resistor RA14 and then to the pin 25 of the controller. The negative electrode of the light-emitting diode of the optocoupler isolation chip ICK2A is grounded. The emitter of the phototransistor of the optocoupler isolation chip ICK2A is connected in parallel to the resistor One end of RA7A and one end of resistor RA8A, the other end of resistor RA7A is connected to the base of transistor VK3A, the other end of resistor RA8A is grounded, the emitter of transistor VK3A is grounded, the collector of transistor VK3A is connected in parallel to the positive electrode of diode VK1A, the positive electrode of diode VK2A, and one end of the relay coil, the cathode of diode VK1A is connected in parallel to the negative electrode of diode VK2A and the other end of the relay coil and then connected to power supply V1; the collector of the phototransistor in the optocoupler isolation chip ICK2A is connected to the external power supply V1.

6. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 2, characterized in that: The relay circuit includes a relay JDQA, the coil of the relay JDQA is connected to the optocoupler isolation circuit, and the contacts of the relay JDQA serve as wiring terminals of the intrinsically safe pilot module and are connected to corresponding buttons in the remote control button box.

7. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 1, characterized in that: The voltage stabilizing circuit includes a first voltage stabilizing unit and a second voltage stabilizing unit. The first voltage stabilizing unit includes a capacitor CA9, a capacitor CA10, an inductor LA1 and a voltage stabilizing tube ICA5. The voltage stabilizing tube ICA5 has pins 1, 2 and 3. Pin 3 of the voltage stabilizing tube ICA5 is connected to VCC. Pin 1 of the voltage stabilizing tube ICA5 is connected in parallel to one end of the capacitor CA9 and one end of the inductor LA1. The other end of the capacitor CA9 is connected in parallel to the other end of the capacitor CA10 and then to ground. The other end of the inductor LA1 is connected in parallel to the other end of the capacitor CA10 and then to the VDD power supply. The second voltage stabilizing unit The element includes a voltage regulator tube ICA4, a capacitor CA8, a capacitor CA7, and a capacitor CA6. The voltage regulator tube ICA4 has pin 1, pin 2, and pin 3. Pin 1 of the voltage regulator tube ICA4 is connected to one end of the capacitor CA8 and is connected to the VCC power supply. Pin 2 of the voltage regulator tube ICA4 is connected in parallel to the other end of the capacitor CA8 and then to ground. Pin 3 of the voltage regulator tube ICA4 is connected in parallel to one end of the capacitor CA6, one end of the capacitor CA7, pin 2 of DA1, and pin 2 of DA2. The other end of the capacitor CA7 and the other end of the capacitor CA8 are connected in parallel to pin 1 of DA3 and pin 1 of DA4 and then to ground.

8. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 5, characterized in that: The controller adopts a single chip microcomputer of model PIC16F873A.

9. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 7, characterized in that: The voltage regulator tube ICA5 and the voltage regulator tube ICA4 adopt 78L12 chips.

10. The intrinsically safe pilot control module for remote start and stop of mine motors based on a single-chip microcomputer according to claim 5, characterized in that: The optical coupler isolation chip ICK2A adopts a PC817 type optical coupler isolator.

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