Control system of explosion-proof and intrinsic safety type underground tunneling equipment and underground tunneling equipment

Abstract

The utility model aims to disclose a control system of explosion-proof and intrinsic safety type underground tunneling equipment and the underground tunneling equipment. The control system comprises an operation box, a display screen and a PLC (Programmable Logic Controller) module, the operation box is provided with a plurality of switches, an STC8G1K08 chip, an MAX485 chip and an NPN type triode; a switching value signal of the switch is connected with an input pin of the STC8G1K08 chip, a TXD end of the STC8G1K08 chip is connected with a sending end of the MAX485 chip, an RXD end of the STC8G1K08 chip is connected with a receiving end of the MAX485 chip, a base electrode of the NPN type triode is connected with the sending end of the MAX485 chip through a first resistor, a collector electrode of the NPN type triode is connected with an RE end and a DE end of the MAX485 chip, and a second resistor is connected with a second resistor. The display screen is a transfer station, switching value signal data are sent to the PLC module, signal data are transmitted between the MAX485 chip and the display screen through a signal line A and a signal line B, and the hardware cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal mine roadway excavation control technology, and in particular to a control system and underground excavation equipment for an explosion-proof and intrinsically safe type of underground excavation equipment. Background Technology

[0002] Underground tunneling equipment requires both explosion-proof and intrinsically safe design to ensure the safety of the control system and prevent gas explosions caused by the control system. Currently, the control circuit of underground tunneling equipment is complex and has a large number of components. Each switch requires a signal line to transmit signals, and each intrinsically safe signal line needs to be equipped with an explosion-proof isolation light grid before it can enter the explosion-proof and intrinsically safe electrical control box, resulting in high hardware costs and low reliability.

[0003] Therefore, it is necessary to develop a control system and underground tunneling equipment that are both explosion-proof and intrinsically safe to overcome the above-mentioned technical problems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to disclose a control system and an underground tunneling device that is both explosion-proof and intrinsically safe.

[0005] The first objective of this invention is to provide a control system for an explosion-proof and intrinsically safe downhole tunneling equipment.

[0006] The second objective of this invention is to provide an underground tunneling device.

[0007] To achieve the first objective mentioned above, this utility model provides a control system for an explosion-proof and intrinsically safe downhole tunneling equipment, including an operation box, a display screen, and a PLC module, wherein the display screen is installed inside the operation box;

[0008] The control box contains several switches, an STC8G1K08 chip, a MAX485 chip, and an NPN transistor.

[0009] The switch's switching signal is connected to the input pin of the STC8G1K08 chip. The TXD terminal of the STC8G1K08 chip is connected to the transmitting terminal of the MAX485 chip. The RXD terminal of the STC8G1K08 chip is connected to the receiving terminal of the MAX485 chip. The base of the NPN transistor is connected to the transmitting terminal of the MAX485 chip through a first resistor. The collector of the NPN transistor is connected to the RE and DE terminals of the MAX485 chip. The emitter of the NPN transistor is grounded. The collector of the NPN transistor is connected to the power module through a pull-up resistor.

[0010] The MAX485 chip is connected to the display screen via signal lines A and B.

[0011] The display screen is connected to the PLC module via signal lines.

[0012] Preferably, the control box is an intrinsically safe control box, and the number of switches is 12.

[0013] Preferably, the display screen is an explosion-proof display screen;

[0014] The A signal line is equipped with a first pull-down resistor and a first TVS transient suppression diode. The first pull-down resistor is connected to the power module, and the first TVS transient suppression diode is grounded.

[0015] The B signal line is equipped with a second pull-down resistor, which is grounded. A second TVS transient suppression diode is connected in parallel with the second pull-down resistor and is grounded.

[0016] Preferably, the power supply module includes a 12V input terminal, two diodes connected in series, a voltage regulator chip LM7805, and a filter capacitor.

[0017] Preferably, when the TXD terminal is high, the transmitting terminal of the MAX485 chip is high, the NPN transistor is turned on, the collector of the NPN transistor is grounded, the RE and DE terminals of the MAX485 chip are grounded, and the MAX485 chip enters the receiving mode.

[0018] Preferably, when the TXD terminal is low, the transmitting terminal of the MAX485 chip is low, the NPN transistor is cut off, the collector of the NPN transistor is pulled up to a high level by the pull-up resistor, the RE and DE terminals of the MAX485 chip are pulled up to a high level, and the MAX485 chip enters the transmitting mode.

[0019] Preferably, the filter capacitor is a 0.1μF ceramic capacitor.

[0020] Preferably, the pull-up resistor has a resistance of 4.7kΩ.

[0021] Preferably, the display screen has a first communication port and a second communication port;

[0022] The second communication port is connected to the MAX485 chip;

[0023] The first communication port is connected to the PLC module.

[0024] Based on the same inventive principle, in order to achieve the second inventive objective mentioned above, this utility model provides an underground tunneling device, characterized in that it includes the control system of the explosion-proof and intrinsically safe underground tunneling device described in the first invention.

[0025] Compared with the prior art, the technical effects of this utility model are as follows:

[0026] This invention uses an STC8G1K08 chip and a MAX485 chip to send several switch signal data to the display screen. The display screen acts as a relay station, and the switch signal data is sent to the PLC module. The display screen used in the underground tunneling equipment is located in the control box, which is intrinsically safe. The PLC module is located in the electrical control box, which is explosion-proof and intrinsically safe. The MAX485 chip and the display screen transmit signal data through signal lines A and B. Only two wires are required, which greatly reduces the number of wires and significantly improves reliability. Only one explosion-proof safety barrier is needed, which greatly reduces hardware costs. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a block diagram of the control system of this utility model.

[0029] Figure 2 This is a schematic diagram of the control system of this utility model.

[0030] Figure 3 This is a schematic diagram illustrating the principle of transmitting switch signals according to this utility model.

[0031] Figure 4 This is a diagram showing the address mapping relationship between the display screen and the PLC module of this utility model. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0034] Embodiment 1

[0035] Refer Figures 1 to 3 As shown, this embodiment discloses a specific implementation manner of a control system for an explosion-proof and intrinsically safe underground tunneling device (hereinafter referred to as "control system").

[0036] Refer to Figures 1 to 3 As shown, the control system of the explosion-proof and intrinsically safe underground tunneling device includes an operation box 1, a display screen 2 and a PLC module 3. The display screen 2 is installed in the operation box 1. The operation box is an intrinsically safe operation box, and the display screen is an explosion-proof display screen. The PLC module 3 is installed in an electric control box 4, and the electric control box 4 is explosion-proof and intrinsically safe. The PLC module 3 controls the tunneling device. The operation box has several switches, an STC8G1K08 chip, a MAX485 chip and an NPN type triode. The number of switches is preferably 12. The STC8G1K08 chip, the MAX485 chip and the NPN type triode Q are important components of a 12-channel switch quantity signal acquisition circuit. The switch quantity signal of the switch is connected to the input pin of the STC8G1K08 chip. Refer to Figure 3For example, input pin P10 is connected to the 8th switch signal, and the corresponding control function is "downward scrolling". Similarly, input pin P32 is connected to the 1st switch signal, and the corresponding control function is "oil pump". The TXD terminal of the STC8G1K08 chip is connected to the DI terminal of the MAX485 chip, and the RXD terminal of the STC8G1K08 chip is connected to the RO terminal of the MAX485 chip. The base of the NPN transistor Q is connected to the DI terminal of the MAX485 chip through the first resistor R1, and the collector of the NPN transistor Q is connected to the RE and DE terminals of the MAX485 chip. The emitter of the NPN transistor Q is grounded, and the collector of the NPN transistor Q is connected to the power module through a pull-up resistor R2 with a resistance of 4.7kΩ. The MAX485 chip is connected to the display screen 2 through signal lines A and B. The display screen is connected to the PLC module through signal lines. In a preferred embodiment, the display screen is connected to the PLC module through signal lines A and B. The display screen 2 has a first communication port COM1 and a second communication port COM2. The second communication port COM2 is connected to the MAX485 chip, and the first communication port COM1 is connected to the PLC module.

[0037] Specifically, refer to Figures 1 to 3 As shown, in this embodiment, several switch signal data are sent to the display screen through the STC8G1K08 chip and the MAX485 chip. The display screen acts as a relay station, and the switch signal data is sent to the PLC module. The display screen used in the underground tunneling equipment is in the control box, which is intrinsically safe. The PLC module is in the electrical control box, which is explosion-proof and intrinsically safe. The MAX485 chip and the display screen transmit signal data through signal lines A and B. Only two wires are required, which greatly reduces the number of wires and significantly improves reliability. Only one explosion-proof safety barrier is needed, which greatly reduces the hardware cost.

[0038] See Figure 3To prevent voltage spikes caused by lightning strikes, electrostatic discharge (ESD), power surges, and switching actions in the circuit, i.e., to prevent transient high voltage, the A signal line is equipped with a first pull-down resistor R3 and a first TVS transient suppression diode D3. The first pull-down resistor R3 is connected to the power module, and the first TVS transient suppression diode D3 is grounded. The B signal line is equipped with a second pull-down resistor R4, which is grounded. A second TVS transient suppression diode D4 is connected in parallel with the second pull-down resistor R4 and is grounded. When encountering transient high voltage, the first TVS transient suppression diode D3 and the second TVS transient suppression diode D4 will change from a high-resistance state to a low-resistance state in a very short time (nanosecond level), dissipating the overvoltage energy to ground through themselves, clamping the voltage of the protected circuit within a safe range, and preventing downstream modules (such as displays) from being broken down or damaged by high voltage.

[0039] See Figure 3 The power supply module includes a 12V input terminal VD12, two diodes D1 connected in series, a voltage regulator chip LM7805, and a filter capacitor C1. The two diodes D1 connected in series prevent reverse power connection. The voltage regulator chip LM7805 can stabilize the output voltage at 5V±5% through its internal adjustment circuit, ensuring that the downstream load chips STC8G1K08 and MAX485 obtain a stable operating voltage and avoiding abnormal operation or damage to the chips due to input voltage fluctuations. The filter capacitor C1 is preferably a 0.1μF ceramic capacitor, which has the characteristics of fast high-frequency response and can quickly absorb high-frequency noise, making the output voltage smoother and avoiding interference from high-frequency fluctuation signals that affect the normal operation of the downstream load chips STC8G1K08 and MAX485. When the downstream load changes suddenly (such as instantaneous start-up or current surge), the 0.1μF ceramic capacitor can act as a "miniature energy storage capacitor" to quickly provide instantaneous current, reduce instantaneous fluctuations in output voltage, and prevent the voltage regulator chip LM7805 from becoming unstable due to load surges.

[0040] See Figures 1 to 3The principle of transmitting the switching signal is as follows: The NPN transistor Q acts as a switch, and its on / off state is determined by the control signal. Specifically, when the TXD terminal is high, the DI terminal of the MAX485 chip is high, the NPN transistor Q is turned on, the collector of the NPN transistor Q is approximately grounded, and the / RE and DE terminals of the MAX485 chip are active low, thus the MAX485 chip enters receive mode. When the TXD terminal is low, the DI terminal of the MAX485 chip is low, the NPN transistor Q is turned off, the collector of the NPN transistor Q is pulled high by the pull-up resistor R2, and the / RE and DE terminals of the MAX485 chip are pulled high, thus the MAX485 chip enters transmit mode. The MAX485 chip sends the switching signal to the second communication port COM2 of the display screen 2. The first communication port COM1 of the display screen 2 forwards the switching signal to the PLC module, which controls the tunneling equipment.

[0041] See Figure 4 The MAX485 chip sends the switch signal to the second communication port COM2 of the display screen 2. The first communication port COM1 of the display screen 2 sends the switch signal to the PLC module. There is an address mapping relationship between the first communication port COM1 and the PLC module. The display screen 2 has 12 addresses from source address 2#00 to 2#11, which can receive 12 channels of switch signals. The target address is the PLC module address V0.0 to V0.3 and V1.0 to V1.7.

[0042] Example 2

[0043] This embodiment discloses a specific implementation of an underground tunneling equipment, which includes the control system of the explosion-proof and intrinsically safe underground tunneling equipment described in Embodiment 1, making the control system of the underground tunneling equipment safe and reliable.

[0044] Example 2 describes the control system of the explosion-proof and intrinsically safe underground tunneling equipment used in Example 1, which will not be repeated here.

Claims

1. A control system of an explosion-proof and intrinsically safe type underground tunneling device, characterized in that, It includes an operation box, a display screen, and a PLC module, with the display screen installed inside the operation box; The control box contains several switches, an STC8G1K08 chip, a MAX485 chip, and an NPN transistor. The switch's switching signal is connected to the input pin of the STC8G1K08 chip. The TXD terminal of the STC8G1K08 chip is connected to the transmitting terminal of the MAX485 chip. The RXD terminal of the STC8G1K08 chip is connected to the receiving terminal of the MAX485 chip. The base of the NPN transistor is connected to the transmitting terminal of the MAX485 chip through a first resistor. The collector of the NPN transistor is connected to the RE and DE terminals of the MAX485 chip. The emitter of the NPN transistor is grounded. The collector of the NPN transistor is connected to the power module through a pull-up resistor. The MAX485 chip is connected to the display screen via signal lines A and B. The display screen is connected to the PLC module via signal lines.

2. The control system of the flame-proof and intrinsically safe type underground tunneling equipment according to claim 1, characterized in that, The control box is an intrinsically safe control box, and the number of switches is 12.

3. The control system of the flame-proof and intrinsically safe type underground tunneling equipment according to claim 1, characterized in that, The display screen is an explosion-proof display screen; The A signal line is equipped with a first pull-down resistor and a first TVS transient suppression diode. The first pull-down resistor is connected to the power module, and the first TVS transient suppression diode is grounded. The B signal line is equipped with a second pull-down resistor, which is grounded. A second TVS transient suppression diode is connected in parallel with the second pull-down resistor and is grounded.

4. The control system of the flame-proof and intrinsically safe type underground tunneling equipment according to claim 1, characterized in that, The power module includes a 12V input terminal, two diodes connected in series, a voltage regulator chip LM7805, and a filter capacitor.

5. The control system of the explosion-proof and intrinsically safe downhole tunneling equipment as described in any one of claims 1-4, characterized in that, When the TXD terminal is high, the transmitting terminal of the MAX485 chip is high, the NPN transistor is turned on, the collector of the NPN transistor is grounded, the RE and DE terminals of the MAX485 chip are grounded, and the MAX485 chip enters the receiving mode.

6. The control system of the flame-proof and intrinsically safe type underground tunneling equipment according to any one of claims 1-4, characterized in that, When the TXD terminal is low, the transmit terminal of the MAX485 chip is low, the NPN transistor is cut off, the collector of the NPN transistor is pulled up to a high level by the pull-up resistor, the RE and DE terminals of the MAX485 chip are pulled up to a high level, and the MAX485 chip enters transmit mode.

7. The control system of the flame-proof and intrinsically safe type underground tunneling equipment according to claim 4, characterized in that, The filter capacitor is a 0.1μF ceramic capacitor.

8. The control system of the flame-proof and intrinsically safe type underground tunneling equipment according to claim 6, characterized in that, The pull-up resistor has a resistance of 4.7kΩ.

9. The control system of the flame-proof and intrinsically safe type underground tunneling equipment according to claim 6, characterized in that, The display screen has a first communication port and a second communication port; The second communication port is connected to the MAX485 chip; The first communication port is connected to the PLC module.

10. A mining machine, characterized in that The control system of the explosion-proof and intrinsically safe downhole tunneling equipment as described in any one of claims 1-9.

Images