Mine ventilation monitoring system

Abstract

The utility model provides a mine ventilation monitoring system. The mine ventilation monitoring system comprises: a gas detection sensor configured to detect gas concentration; a dust detection sensor configured to detect a dust concentration; the anemograph is configured to detect the wind speed; a plurality of analog quantity input ends of the multi-path AD conversion module are respectively connected with an output end of the gas detection sensor, an output end of the dust detection sensor and an output end of the anemograph, and a digital quantity output end of the multi-path AD conversion module is connected with a main control chip; and the main control chip is configured to control the power of the fan based on the gas concentration, the dust concentration and the wind speed. The mine ventilation monitoring system can solve the problems that an existing mine ventilation monitoring system is complex in line wiring and tedious in maintenance.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of automatic control, and in particular to a mine ventilation monitoring system. BACKGROUND

[0002] Gas (main component is methane) and dust are generated in the process of underground mining. When the gas concentration is in the range of 5%-16%, an explosion will occur if a fire source (such as an electric spark, a friction spark, a blasting flame, etc.) is encountered. The gas explosion will produce high temperature, high pressure and strong shock wave, causing casualties and property losses. At the same time, long-term exposure to a high dust concentration environment will cause inflammation of the lung tissue. Therefore, strengthening the ventilation of the mine can improve the working environment underground and protect the health of the operating personnel.

[0003] The existing mine ventilation monitoring system usually needs to be provided with multiple sensors to realize real-time monitoring of the gas concentration and the dust concentration. A large number of sensors make the line wiring complex and the maintenance cumbersome. CONTENT OF THE INVENTION

[0004] The mine ventilation monitoring system provided by the embodiments of the present disclosure can solve the problem of complex line wiring and cumbersome maintenance of the existing mine ventilation monitoring system.

[0005] The mine ventilation monitoring system provided by the embodiments of the present disclosure comprises:

[0006] a gas detection sensor configured to detect a gas concentration;

[0007] a dust detection sensor configured to detect a dust concentration;

[0008] an anemometer configured to detect a wind speed;

[0009] a multi-channel AD conversion module, a plurality of analog quantity input ends of the multi-channel AD conversion module are connected with an output end of the gas detection sensor, an output end of the dust detection sensor and an output end of the anemometer respectively, and a digital quantity output end of the multi-channel AD conversion module is connected with a master control chip;

[0010] the master control chip is configured to control the power of a fan based on the gas concentration, the dust concentration and the wind speed.

[0011] In an exemplary embodiment of the present disclosure, the mine ventilation monitoring system further comprises a sensor interface short circuit protection circuit, the sensor interface short circuit protection circuit comprises a switch tube Q1, a switch tube Q2, a resistor R3 and a diode D1,

[0012] The control end of the switch tube Q1 is connected with the first end of the resistor R3, the second end of the resistor R3 is connected with a power supply, the first end of the switch tube Q1 is connected with the control end of the switch tube Q2, and the second end of the switch tube Q1 is grounded,

[0013] The first end of the switch tube Q2 is connected with a power supply, the second end of the switch tube Q2 is connected with the first end of a sensor interface, and the second end of the sensor interface is grounded,

[0014] The anode of the diode D1 is connected with the first end of the resistor R3, and the cathode of the diode D1 is connected with the first end of the sensor interface.

[0015] In an example embodiment of the present disclosure, the mine ventilation monitoring system further comprises:

[0016] A carbon monoxide detection sensor configured to detect the concentration of carbon monoxide, and an output end of the carbon monoxide detection sensor is connected with an analog input end of the multi-channel AD conversion module.

[0017] In an example embodiment of the present disclosure, an amplification circuit is arranged between the output end of the gas detection sensor and the analog input end of the multi-channel AD conversion module.

[0018] In an example embodiment of the present disclosure, the mine ventilation monitoring system further comprises:

[0019] A frequency converter, a control end of the frequency converter is connected with a DA signal output end of the main control chip, and an output end of the frequency converter is connected with a power supply end of the fan.

[0020] In an example embodiment of the present disclosure, a signal conversion circuit is arranged between the control end of the frequency converter and the DA signal output end of the main control chip, and the signal conversion circuit comprises an operational amplifier U3, a switch tube Q3, a resistor R18 and a resistor R19,

[0021] The non-inverting input end of the operational amplifier U3 is connected with the DA signal output end of the main control chip, the output end of the operational amplifier U3 is connected with the control end of the switch tube Q3, the first end of the switch tube Q3 is feedback connected to the inverting input end of the operational amplifier U3, and the first end of the switch tube Q3 is further grounded through the resistor R19,

[0022] The second end of the switch tube Q3 is connected with the second current command input end of the frequency converter, and the first current command input end of the frequency converter is connected with a power supply.

[0023] In an example embodiment of the present disclosure, the mine ventilation monitoring system further comprises:

[0024] A communication module, through which the master control chip is connected with a background monitoring center.

[0025] The mine ventilation monitoring system provided by the embodiments of the present disclosure has the following working principle and advantages:

[0026] The embodiments of the present disclosure realize energy-saving and efficient operation of the fan by detecting the gas concentration, dust concentration and wind speed in real time and adjusting the fan power according to the detection results, on the basis of providing suitable ventilation conditions for the operating personnel. The specific process is as follows: when the gas concentration or dust concentration increases, the master control chip will control the fan to increase the power and increase the ventilation volume to reduce the gas concentration or dust concentration; at the same time, considering that when the wind speed is too high, the dust and other harmful substances in the underground air are more easily inhaled by the human body, therefore, by detecting the wind speed through the anemometer and adjusting the fan power based on the wind speed detection result, the harm caused by the too high wind speed can be avoided.

[0027] Further, the embodiments of the present disclosure use a multi-channel AD conversion module to convert multiple sensor signals, which reduces the complexity of wiring and improves the reliability and maintainability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is a circuit schematic diagram of the mine ventilation monitoring system provided by the embodiments of the present disclosure;

[0030] Figure 2 is a principle diagram of the signal conversion circuit provided by the embodiments of the present disclosure. DETAILED DESCRIPTION

[0031] In order to make the person skilled in the art better understand the present scheme, the technical solutions in the embodiments of the present scheme will be clearly described below in combination with the drawings in the embodiments of the present scheme. Obviously, the described embodiments are only part of the embodiments of the present scheme, not all. Based on the embodiments in the present scheme, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present scheme.

[0032] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0033] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0034] Figure 1 This is a circuit diagram of a mine ventilation monitoring system provided in an embodiment of the present disclosure. (Refer to...) Figure 1 The mine ventilation monitoring system includes:

[0035] The gas detection sensor is configured to detect gas concentration;

[0036] The dust detection sensor is configured to detect dust concentration;

[0037] An anemometer is configured to detect wind speed;

[0038] The multi-channel AD conversion module has multiple analog input terminals connected to the output terminals of the gas detection sensor, the dust detection sensor, and the anemometer, respectively, and the digital output terminal of the multi-channel AD conversion module is connected to the main control chip.

[0039] The main control chip is configured to control the fan power based on gas concentration, dust concentration, and wind speed.

[0040] In this embodiment, by real-time detection of methane concentration, dust concentration, and wind speed, and adjusting the fan power based on the detection results, energy-efficient operation of the fan is achieved while providing suitable ventilation conditions for workers. Specifically, when the methane or dust concentration increases, the main control chip controls the fan to increase its power and ventilation volume to reduce the methane or dust concentration. Simultaneously, considering that a suitable wind speed ensures that harmful gases and dust are diluted and discharged from the mine in a timely manner, and provides a comfortable working environment for underground workers, excessively high or low wind speeds can pose safety hazards. For example, when the wind speed is too high, harmful substances such as dust in the underground air are more easily inhaled. Therefore, detecting wind speed with an anemometer and adjusting the fan power based on the wind speed detection results can avoid the hazards caused by excessively high wind speeds.

[0041] The multi-channel AD conversion module specifically adopts PCF8591T, has four analog input channels, can simultaneously connect multiple sensors, converts analog signals detected by the sensors into digital signals, and transmits the analog-to-digital conversion result to the host chip through an I2C interface (SCL-clock line and SDA-data line).

[0042] As can be seen from the above, the multi-channel AD conversion module is adopted to convert multiple sensor signals, which reduces the complexity of wiring, improves the reliability and maintainability of the circuit.

[0043] Referring to Figure 1 In an exemplary embodiment of the present disclosure, the mine ventilation monitoring system further comprises a sensor interface short circuit protection circuit, which comprises a switch tube Q1, a switch tube Q2, a resistor R3 and a diode D1,

[0044] The control end of the switch tube Q1 is connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the power supply, the first end of the switch tube Q1 is connected with the control end of the switch tube Q2, and the second end of the switch tube Q1 is grounded,

[0045] The first end of the switch tube Q2 is connected with the power supply, the second end of the switch tube Q2 is connected with the first end of the sensor interface, and the second end of the sensor interface is grounded,

[0046] The anode of the diode D1 is connected with the first end of the resistor R3, and the cathode of the diode D1 is connected with the first end of the sensor interface.

[0047] In the present embodiment, the gas detection sensor is connected into the circuit through the interface H1, the dust detection sensor is connected into the circuit through the interface H2, and the anemograph is connected into the circuit through the interface H3. In order to avoid the short circuit of the power supply caused by the wiring error of the sensor, the present embodiment is provided with a sensor interface short circuit protection circuit.

[0048] Taking the interface H1 as an example, the working principle of the sensor interface short circuit protection circuit is as follows: when the wiring is normal, the control end of the switch tube Q1 is high, the switch tube Q1 is turned on, the control end of the switch tube Q2 is pulled down, the switch tube Q2 is turned on (the switch tube Q2 is a PMOS tube), the first end of the sensor interface is connected with the power supply VCC, the second end of the sensor interface is grounded, and the sensor works normally.

[0049] When the sensor connection is wrong or the sensor is short-circuited, the first end of the sensor interface is at a low level, the diode D1 is turned on, the control end of the switch tube Q1 is pulled low, the switch tube Q1 is turned off, the switch tube Q2 is turned off, and the connection between the first end of the sensor interface and the power supply VCC is disconnected, thereby avoiding the short circuit of the power supply VCC.

[0050] In the embodiment, the resistor R1 and the resistor R2 are current limiting resistors, which can prevent the circuit at the control end of the switch tube Q1 or the switch tube Q2 from being too large.

[0051] As can be seen from the above, in the embodiment, the switch tube Q1, the switch tube Q2 and the diode D1 are arranged, which can effectively prevent the power supply from being short-circuited due to the wrong sensor connection, and the reliability of the entire monitoring system is improved.

[0052] In an exemplary embodiment of the present disclosure, the mine ventilation monitoring system further comprises:

[0053] The carbon monoxide detection sensor is configured to detect the concentration of carbon monoxide, and the output end of the carbon monoxide detection sensor is connected to the analog input end of the multi-channel AD conversion module.

[0054] In the embodiment, it is considered that when a fire occurs in the mine, a large amount of carbon monoxide will be produced due to incomplete combustion of coal and other substances, and when the carbon monoxide is inhaled by the human body, it will combine with hemoglobin to make it lose the ability to carry oxygen, resulting in hypoxia of the human body. Therefore, the concentration of carbon monoxide is also monitored in the embodiment.

[0055] Specifically, the carbon monoxide detection sensor can be arranged at positions such as the electromechanical chamber and the belt conveyor lane where fires are prone to occur, and the main control chip can adjust the fan power according to the real-time detected concentration of carbon monoxide.

[0056] As can be seen from the above, in the embodiment, it is considered that the concentration of carbon monoxide will rise sharply after an accident such as gas explosion, and by monitoring the concentration of carbon monoxide in real time and adjusting the fan power accordingly, the safety of the mine can be further ensured.

[0057] Referring to Figure 1 In an exemplary embodiment of the present disclosure, an amplification circuit is arranged between the output end of the gas detection sensor and the analog input end of the multi-channel AD conversion module.

[0058] In the embodiment, the output signal of the gas detection sensor is relatively weak, and the amplification circuit arranged at the output end of the gas detection sensor can amplify the output signal of the gas detection sensor, thereby facilitating the accurate conversion of the multi-channel AD conversion module.

[0059] Similarly, amplification circuits are arranged at the output end of the dust detection sensor, the output end of the anemometer and the output end of the carbon monoxide detection sensor.

[0060] Referring to Figure 2 In an example embodiment of the present disclosure, the mine ventilation monitoring system further comprises:

[0061] The control end of the frequency converter is connected with the DA signal output end of the main control chip, and the output end of the frequency converter is connected with the power supply end of the fan.

[0062] In this embodiment, when the main control chip judges that the underground environment parameter changes according to the detection results of the gas detection sensor, the dust detection sensor and the anemograph, the adjustment instruction can be sent to the frequency converter through the DA signal output end. The frequency converter can quickly adjust the output frequency after receiving the instruction, so as to realize the speed regulation of the fan.

[0063] Referring to Figure 2 In an example embodiment of the present disclosure, a signal conversion circuit is arranged between the control end of the frequency converter and the DA signal output end of the main control chip, and the signal conversion circuit comprises an operational amplifier U3, a switching tube Q3, a resistor R18 and a resistor R19,

[0064] The non-inverting input end of the operational amplifier U3 is connected with the DA signal output end of the main control chip, the output end of the operational amplifier U3 is connected with the control end of the switching tube Q3, the first end of the switching tube Q3 is feedback connected to the inverting input end of the operational amplifier U3, and the first end of the switching tube Q3 is also grounded through the resistor R19,

[0065] The second end of the switching tube Q3 is connected with the second current instruction input end of the frequency converter, and the first current instruction input end of the frequency converter is connected with the power supply.

[0066] In this embodiment, the instruction signal output by the DA signal output end of the main control chip is a voltage signal. Considering that there are a large number of electrical equipment, motors and the like in the mine environment, various electromagnetic interferences will be generated. In order to realize accurate transmission of the instruction signal, the signal conversion circuit is arranged in this embodiment to convert the voltage signal of the DA signal output end into a 4-20mA signal for transmission. The 4-20mA current signal has stronger anti-interference ability to electromagnetic interference in the transmission process.

[0067] The working principle of the signal conversion circuit is as follows: according to the "virtual break" principle of the operational amplifier, the current of the resistor R18 is zero, and the terminal voltage of the resistor R19 is equal to the voltage of the inverting input end of the operational amplifier U3; according to the "virtual short" principle of the operational amplifier, the voltage of the inverting input end of the operational amplifier U3 is equal to the voltage of the non-inverting input end, so the terminal voltage of the resistor R19 is equal to the voltage of the non-inverting input end of the operational amplifier U3, and the current of the resistor R19 is:

[0068]

[0069] The current through the resistor R18 is zero, and thus the current through the resistor R19 is equal to the emitter current of the switch tube Q3, which is approximately equal to the collector current of the switch tube Q3, and the collector current of the switch tube Q3 is the output current of the signal conversion circuit, and thus the output current of the signal conversion circuit is equal to the current through the resistor R19.

[0070] From the above, it can be concluded that the embodiment can realize stable transmission of the instruction signal and ensure accurate transmission of the instruction signal in a complex electromagnetic environment by converting the instruction signal of the master control chip into a 4-20mA current signal.

[0071] In an exemplary embodiment of the present disclosure, the mine ventilation monitoring system further comprises:

[0072] The communication module is connected to the background monitoring center by the master control chip.

[0073] In the embodiment, the communication module can transmit the information such as the gas concentration, the dust concentration, the wind speed, the carbon monoxide concentration, and the running state of the fan received by the master control chip to the background monitoring center, and the staff of the background monitoring center can intuitively see the changes of various parameters of the underground ventilation system through the monitoring software and interface, thereby comprehensively understanding the underground ventilation condition.

[0074] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A mine ventilation monitoring system, characterized in that, include: The gas detection sensor is configured to detect gas concentration; The dust detection sensor is configured to detect dust concentration; An anemometer is configured to detect wind speed; A multi-channel AD conversion module, wherein multiple analog input terminals of the multi-channel AD conversion module are respectively connected to the output terminals of the gas detection sensor, the dust detection sensor, and the anemometer, and the digital output terminal of the multi-channel AD conversion module is connected to the main control chip; The main control chip is configured to control the power of the fan based on gas concentration, dust concentration and wind speed.

2. The mine ventilation monitoring system of claim 1, wherein, It also includes a sensor interface short-circuit protection circuit, which includes a switch Q1, a switch Q2, a resistor R3, and a diode D1. The control terminal of the switching transistor Q1 is connected to the first terminal of the resistor R3, the second terminal of the resistor R3 is connected to the power supply, the first terminal of the switching transistor Q1 is connected to the control terminal of the switching transistor Q2, and the second terminal of the switching transistor Q1 is grounded. The first terminal of the switching transistor Q2 is connected to the power supply, the second terminal of the switching transistor Q2 is connected to the first terminal of the sensor interface, and the second terminal of the sensor interface is grounded. The anode of the diode D1 is connected to the first end of the resistor R3, and the cathode of the diode D1 is connected to the first end of the sensor interface.

3. The mine ventilation monitoring system of claim 1, wherein, Also includes: A carbon monoxide detection sensor is configured to detect the concentration of carbon monoxide, and the output of the carbon monoxide detection sensor is connected to the analog input of the multiplex AD conversion module.

4. The mine ventilation monitoring system of claim 1, wherein, An amplifier circuit is provided between the output terminal of the gas detection sensor and the analog input terminal of the multi-channel AD conversion module.

5. The mine ventilation monitoring system of claim 1, wherein, Also includes: The inverter has its control terminal connected to the DA signal output terminal of the main control chip, and its output terminal connected to the power supply terminal of the fan.

6. The mine ventilation monitoring system of claim 5, wherein, A signal conversion circuit is provided between the control terminal of the frequency converter and the DA signal output terminal of the main control chip. The signal conversion circuit includes operational amplifier U3, switching transistor Q3, resistor R18, and resistor R19. The non-inverting input of operational amplifier U3 is connected to the DA signal output of the main control chip. The output of operational amplifier U3 is connected to the control terminal of switching transistor Q3. The first terminal of switching transistor Q3 is fed back to the inverting input of operational amplifier U3. The first terminal of switching transistor Q3 is also grounded through resistor R19. The second terminal of the switching transistor Q3 is connected to the second current command input terminal of the frequency converter, and the first current command input terminal of the frequency converter is connected to the power supply.

7. The mine ventilation monitoring system of claim 1, wherein, Also includes: The main control chip is connected to the background monitoring center through the communication module.

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