Coal mine drill site gas monitoring system

Abstract

The utility model belongs to the technical field of coal mine gas detection, and aims to solve the problem that a gas monitoring blind area exists in a high-gas mine and a coal and gas outburst mine. The coal mine drill site gas monitoring system comprises a monitoring substation, a gas sensor and an upper computer, the N monitoring substations are correspondingly arranged in N separated drill site areas of a coal mine, a gas sensor is arranged at each of four positions of a drilling machine drilling hole, a drill site upwind side, a drill site downwind side and a slag discharge port of each drill site area, and the gas sensor in the same drill site area is in communication connection with the monitoring substations through an RS485 bus; the N monitoring substations are in communication connection with the upper computer, and a CAN-to-Ethernet gateway is connected between the N monitoring substations and the upper computer. According to the system, the arrangement of gas monitoring points in a kilometer drill site area of a coal mine can be optimized, signal acquisition and transmission all adopt a wired transmission mode, and the accuracy and stability of signal transmission can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal mine gas detection technical field, concretely relates to a coal mine drilling field gas monitoring system. BACKGROUND

[0002] In the production process of coal mine, gas is the important factor of most serious influence safety production, and with the deep extension of mine exploitation, coal seam gas content will also increase. Many coal mines use "U type" ventilation system mode in working face, and use the method of bottom pumping lane construction to the upward hole, utilize the drilling machine to carry out advance gas pumping, can effectively solve the problem of high gas concentration in fully mechanized working face of mine, guarantee the safety and high efficiency of stoping. However, the coal mine drilling field point is widely distributed, and the existing monitoring system has loopholes in the gas monitoring of the area, and the installation of gas sensor only on the downwind side of the drilling field cannot guarantee the real-time monitoring of gas. Especially for high gas mine, coal and gas outburst mine and the like, there is a gas monitoring blind area. CONTENT OF UTILITY MODEL

[0003] The utility model discloses in order to solve the above at least one technical problem in prior art, provides a coal mine drilling field gas monitoring system.

[0004] The utility model discloses the following technical scheme is adopted: a coal mine drilling field gas monitoring system, including monitoring substation, gas sensor and host computer;N monitoring substation is set up in the N drilling field area of coal mine separation correspondingly, and each drilling field area is provided with a gas sensor at four positions of drilling rig drilling hole, drilling field upwind side, drilling field downwind side and slag outlet, and the gas sensor of the same drilling field area is connected with monitoring substation through RS485 bus communication, and N monitoring substation and host computer are connected and are connected with CAN to ethernet gateway between the two.

[0005] Preferably, the core of the monitoring substation is an STM32F103RBT6 microcontroller, the signal input end of the microcontroller is connected with the 4-way gas sensor, and the CAN bus interface of the microcontroller is connected with the CAN to Ethernet gateway.

[0006] Preferably, the signal output end of the microcontroller is connected with a gas alarm circuit and a controlled device, and the controlled device includes all non-intrinsically safe electrical equipment in the drilling field area.

[0007] Preferably, the model of the gas sensor is KG9001C, the gas sensor is connected with the monitoring substation through the RS485 bus interface, and the microcontroller is built-in AD conversion channel and clock / reset circuit.

[0008] Preferably, the core chip of the RS485 bus communication circuit includes MAX485 and PC817, and the core chip of the CAN bus communication circuit is TJA1050.

[0009] Preferably, the signal input end of the microcontroller is connected with the intrinsic safety power module, and the signal output end of the microcontroller is connected with the liquid crystal display screen and the indicator lamp circuit.

[0010] Preferably, the remote control receiving end of the microcontroller is connected with the remote controller.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The system can optimize the arrangement of the gas monitoring points in the coal mine kilometer drilling field area, and the signal acquisition and transmission are all realized by the wired transmission mode, so that the accuracy and stability of the signal transmission can be ensured. The application of the system can improve the mine monitoring informatization level, and make the management more standardized and intelligent. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical schemes in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows.

[0014] Figure 1 It is the structure connection block diagram of the embodiment;

[0015] Figure 2 It is the schematic view of the microcontroller of the embodiment;

[0016] Figure 3 It is the schematic view of the RS485 communication circuit of the embodiment;

[0017] Figure 4 It is the schematic view of the CAN communication circuit of the embodiment;

[0018] Figure 5 It is the circuit diagram of the intrinsic safety power module of the embodiment. DETAILED DESCRIPTION

[0019] The technical schemes in the embodiments of the utility model are clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope protected by the utility model.

[0020] It is to be understood that the structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the disclosed content, for the understanding and reading of those skilled in the art, and are not used to limit the implementation of the present application, so they do not have technical significance, any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose of the present application, should be within the scope of the disclosed technology, it should be noted that in the present application, the relationship terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between the entities.

[0021] The present application provides an embodiment:

[0022] As Figure 1 shown, a coal mine drilling field gas monitoring system, including monitoring substation, gas sensor and host computer; N monitoring substation is correspondingly arranged in N drilling field area separated by coal mine, a gas sensor is arranged at each of the four positions of drilling rig drilling hole, upwind side of drilling field, downwind side of drilling field and slag discharge port of each drilling field area, which is used for continuously monitoring the gas concentration change of each environment in the area; the gas sensor and the monitoring substation of the same drilling field area are connected through RS485 bus communication, the N monitoring substation and the host computer are connected and the CAN to Ethernet gateway is connected between them, each monitoring substation displays the gas concentration value of the area on site, and simultaneously connects the collected gas data to industrial Ethernet in the form of CAN bus, so as to realize long-distance transmission of information.

[0023] The host computer can monitor the gas concentration of each drilling field area in the well in real time, and the on-site and ground monitoring system can sound and light alarm when the gas concentration is over limit, and can quickly realize the gas electric lock of the drilling field, and can ensure the safety of the production site; when the gas concentration returns to normal, the monitoring system can realize automatic power recovery.

[0024] As Figure 2 shown, the core of the monitoring substation is STM32F103RBT6 microcontroller, which is a high-performance, low-cost and low-power 32-bit microcontroller based on high-performance ARM Cortex-M3 architecture kernel. The signal input end of the microcontroller is connected with 4-way gas sensor, and any fault will not affect the normal communication of the other 3 ways; the CAN bus interface of the microcontroller is connected with the CAN to Ethernet gateway. The signal output end of the microcontroller is connected with gas alarm circuit and controlled equipment, and the controlled equipment includes all non-intrinsically safe electrical equipment in the drilling field area. The signal input end of the microcontroller is connected with the intrinsically safe power module, and the signal output end of the microcontroller is connected with liquid crystal display and indicator light circuit. The remote control receiving end of the microcontroller is connected with remote controller.

[0025] The monitoring substation can use the remote controller to modify the upper and lower limit values of the alarm parameters, the sensor access state, and the substation number. The indicator light is used to determine whether the communication situation, power voltage, etc. are normal. In the host computer software, all gas probes and audible and visual alarm devices need to be numbered. The alarm value here is set to 0.5%, and accidents caused by gas over-limit are strictly prevented.

[0026] The model of the gas sensor is KG9001C. The gas sensor is connected with the monitoring substation through the RS485 bus interface. The microcontroller has built-in AD conversion channels and clock / reset circuits. The sensor can directly send the collected analog signals to the microcontroller for AD conversion, and then perform data processing.

[0027] The sensor has stable performance, high measurement accuracy, and fast response speed. It can continuously and automatically convert the gas concentration into standard signals and transmit them to the substation. When the gas sensor exchanges data with the monitoring substation through the RS485 bus interface, the address needs to be set using the remote controller to ensure that the communication protocols of the two are consistent. The substation further uploads data through the CAN bus interface to realize long-distance transmission of information. When the gas concentration reaches the alarm value, the audible and visual alarm circuit is triggered to work, and the gas electric lock of the drilling site is quickly activated. The entire substation is powered by DC voltage, and through various voltage conversion circuits, it provides appropriate power for the indicator light, liquid crystal display, gas sensor, and alarm circuit.

[0028] As shown in Figure 3 , the RS485 bus communication circuit is designed as shown in the following figure. It mainly uses MAX485 and PC817 chips. MAX485 is a low-function transceiver for RS-485 communication. Its structure and pins are very simple. It contains a driver and a receiver inside. When connected with the processor, only one signal is needed to control the reception and transmission of MAX485. PC817 is a device that uses light as a medium to transmit electrical signals. It has low power consumption. It is added to the receiving end, transmitting end, and enable end of the MAX485 chip. When there is an electrical signal at the input end, it can convert the electrical signal into a light signal and then convert it back into an electrical signal. Finally, it is output from the output end, which greatly reduces electrical interference.

[0029] As shown in Figure 4As shown, the monitoring substation and gateway are connected via the CAN bus. The communication circuit design is shown in the figure below. Since the STM32 has a built-in CAN controller, only an external CAN transceiver is required; the TJA1050 is used here. When the substation uploads information, the STM32 processor transmits data from CANH and CANL via the TXD pin of the TJA1050 CAN bus transceiver. When receiving data from the CAN bus, it is sent to the STM32 via the RXD pin of the TJA1050 transceiver for processing. During data transmission and reception, the corresponding indicator light flashes, indicating normal communication between the monitoring substation and the CAN-to-Ethernet module. A 120Ω termination resistor improves communication immunity and ensures signal quality.

[0030] like Figure 5 As shown in the figure, the voltage requirements of various devices in the gas monitoring system for the kilometer drilling site vary. The indicator light circuit requires a DC 3.3V voltage, the LCD display requires a DC 12V voltage, and the gas sensor and sound and light alarm require a DC 12V intrinsically safe voltage. The intrinsically safe power supply circuit design is shown below: The AC 127V voltage generated by the lighting comprehensive protection is transformed to an AC 36V voltage, which is input through port P0. After rectification by D1-D4 and filtering by C1, the intrinsically safe 12V voltage is obtained at port P1 after being stabilized by two DC voltage regulators, U1 and U2. By changing the resistance values ​​of V1 and V2, the output of the voltage regulator can be adjusted accordingly. The protection principle of the circuit for overvoltage and overcurrent is as follows: when the output voltage of the first and second stages is higher than the regulated voltage value of Z1 or Z2, the diode is broken down, and the current flows into the optoelectronic isolator G1 or G2 through R4, D5 or R7, D6. After the output transistor is turned on, the control end of the voltage regulator is 0, thereby playing an overvoltage protection role; after the output current of the first and second stages increases abnormally, the transistor T1 or T2 is turned on after the voltage drop through R1 or R2, and the current flows into the optoelectronic isolator G1 or G2 through R3 or R6, and the output transistor is turned on, thereby limiting U1 or U2 and reducing the output current.

[0031] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A coal mine drilling site gas monitoring system, characterized in that: The monitoring substation, the gas sensor and the host computer are included; N monitoring substation corresponding set in coal mine N drill field area is separated, each drill field area's gas sensor and monitoring substation are connected through RS485 bus communication, N monitoring substation and host computer communication connection and between two connection has CAN to ethernet gateway.

2. The coal mine drill field gas monitoring system according to claim 1, wherein: The core of the monitoring substation is an STM32F103RBT6 microcontroller, the signal input end of the microcontroller is connected with four gas sensors, and the CAN bus interface of the microcontroller is connected with the CAN to Ethernet gateway.

3. The coal mine drilling field gas monitoring system of claim 2, wherein: The signal output end of the microcontroller is connected with a gas alarm circuit and a controlled device, and the controlled device includes non-intrinsic safety electrical equipment in the drill field area.

4. A coal mine drilling site gas monitoring system according to claim 2, characterized in that: The model of the gas sensor is KG9001C, and the gas sensor is connected with the monitoring substation through the RS485 bus interface, and the microcontroller is built-in with an AD conversion channel and a clock / reset circuit.

5. The coal mine drilling field gas monitoring system of claim 1, wherein: The core chip of the RS485 bus communication circuit includes MAX485 and PC817, and the core chip of the CAN bus communication circuit is TJA1050.

6. The coal mine drilling field gas monitoring system of claim 2, wherein: The signal input end of the microcontroller is connected with an intrinsic safety power module, and the signal output end of the microcontroller is connected with a liquid crystal display and an indicator light circuit.

7. The coal mine drilling field gas monitoring system of claim 2, wherein: The remote control receiving end of the microcontroller is connected with a remote controller.

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