Anti-wrapping device of mining gas sensor

Abstract

The invention discloses an anti-wrapping device for a mining gas sensor, which can judge whether the gas sensor is wrapped or shielded or not through vibration, wind speed, illuminance, distance measurement, an infrared sensing device and personnel information by utilizing a single chip microcomputer technology, and can judge whether the gas sensor is wrapped or shielded or not by adopting the technical scheme of the invention. The occurrence of disastrous accidents is effectively prevented, and the safety production benefit of a coal mine is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine gas sensors, and in particular relates to an anti-wrapping device for a mine gas sensor. Background Art

[0002] All coal mines in my country are gas mines. According to statistics, among the 609 mines of 100 state-owned key coal production enterprises, high-gas mines account for 26.8%, coal and gas outburst mines account for 17.6%, and low-gas mines account for 55.6%. Among state-owned local and township coal mines, high-gas mines and coal and gas outburst mines account for about 25%. Therefore, the "Coal Mine Safety Regulations" stipulates that fixed gas sensors should be installed at key parts of the coal mine working face to monitor the changes in gas concentration during coal mining in real time and transmit them to the superior department in real time. Once the gas over-limit alarm is detected, coal mining must be stopped immediately. The superior department will immediately put forward the requirements for inspection, analysis and rectification to prevent the occurrence of gas explosion accidents. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an anti-wrapping device for a mine gas sensor.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A mine gas sensor anti-wrapping device comprises: a single chip microcomputer, a gas sensor connected to the single chip microcomputer, a vibration sensor, a wind speed sensor, an illumination sensor, a distance sensor and an infrared sensor; the mine gas sensor anti-wrapping device and the mine gas sensor are structurally integrated and are located on the side of the gas sensor; wherein, through vibration, wind speed, illumination, distance and infrared sensing information as well as personnel information, it is determined whether the gas sensor is wrapped or blocked, and if so, by whom it is wrapped or blocked.

[0006] As a preference, the single-chip CPU uses a low-power MSP430, whose power supply voltage is 1.8-3.6V.

[0007] Preferably, when the single-chip CPU runs at a clock frequency of 1 MHz, the minimum current of the chip is 165 μA, and the minimum power consumption in the RAM retention mode is 0.1 μA.

[0008] Preferably, the single-chip microcomputer CPU is awakened from the low power consumption mode to the active state by utilizing its external interrupt form, and the external interrupt signal is a vibration sensor signal.

[0009] Preferably, after the vibration sensor signal wakes up the MSP430, the MSP430 CPU enters the interrupt service program, and determines whether the gas sensor is wrapped or blocked by collecting wind speed, illumination, distance measurement and infrared sensor values.

[0010] Preferably, in the MSP430 interrupt service program, the wind speed, illumination, ranging and infrared sensor information are first collected once per second for 10 seconds, and compared with the stored normal values. If it is wrapped or blocked, the measured wind speed is less than the normal value, the illumination is also less than the normal value, the distance to the reference object is larger than the normal value, and the infrared is also less than the normal value. The difference between the wind speed, illumination, ranging and infrared sensor values ​​and the pre-set normal values ​​is used to determine whether it is wrapped or blocked. If the difference between the comparison values ​​of more than two sensors exceeds the threshold, the gas sensor is wrapped or blocked. At the same time, the person who is wrapped or blocked is determined by calling the personnel positioning information at that time.

[0011] The technical effects of the present invention are as follows:

[0012] (1) It can ensure that the gas sensor can obtain the gas concentration in the coal mine in real time;

[0013] (2) It can monitor in real time when the gas sensor is wrapped or blocked and quickly issue an alarm, greatly improving the safety and production efficiency of coal mines;

[0014] (3) Safe and reliable, low power consumption, no use of high current devices, no need to consider explosion-proof and other issues;

[0015] (4) It has promoted the construction of intelligent mines and provided technical support for unmanned or undermanned operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 The figure is a schematic diagram of the structure of the anti-wrapping device for a mining gas sensor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Embodiment 1:

[0021] An embodiment of the present invention provides an anti-wrapping device for a mine gas sensor. Based on a single-chip computer, through vibration, wind speed, illumination, ranging, infrared and other sensing devices as well as personnel information, it can be determined whether the gas sensor is wrapped or blocked, and by whom it is wrapped or blocked. The anti-wrapping or blocking device for the mine gas sensor must be structurally integrated with the mine gas sensor and located on the side of the gas sensor.

[0022] like Figure 1 As shown, a mine gas sensor anti-wrapping device includes: a single-chip microcomputer, a gas sensor connected to the single-chip microcomputer, a vibration sensor, a wind speed sensor, an illumination sensor, a distance sensor and an infrared sensor. The UART of the single-chip microcomputer communicates with the serial port of the computer. For a newly installed gas sensor, firstly, according to the location of the gas sensor, the wind speed A, illumination B, the distance C of a certain obvious reference object and the infrared value D of the environment are input to the computer one by one, and then the computer transmits them to the single-chip microcomputer through the serial port, and then the single-chip microcomputer stores them in its own RAM area. The single-chip microcomputer can also execute the initialization program after installing the gas sensor, automatically read the wind speed A, illumination B, the distance C of a certain obvious reference object and the infrared value D of the environment, and then store them in its own RAM area.

[0023] The single-chip CPU uses the low-power MSP430, and its power supply voltage is 1.8-3.6V. Therefore, when it runs under the clock condition of 1MHz, the minimum current of the chip will be around 165μA, and the minimum power consumption in RAM retention mode is only 0.1μA. It has 5 low-power modes, namely LPM0~LPM4 (LOW POWER MODE), and the active state of the CPU is called AM (ACTIVE MODE) mode. Among them, AM consumes the most power, and LPM4 consumes the least power, only 0.1μA. The patent of the present invention selects this low-power mode. Usually, the CPU is in this low-power sleep state. From this low-power mode, it is awakened to the active state by using its external interrupt form. The external interrupt signal is a vibration sensor signal. If the gas sensor is not shaken in a normal state, the vibration sensor signal is very small and is not enough to cause an interrupt. However, when the gas sensor is wrapped or blocked, a large vibration will be generated, and the vibration sensor signal will become larger, causing the MSP430 external interrupt (Pin36 P2.7-SW-420), and the MSP430 CPU is awakened.

[0024] After the vibration sensor signal wakes up the MSP430, the MSP430CPU enters the interrupt service program. By collecting wind speed (data interface Pin18 SCL, Pin17 SDA), illumination (data interface Pin29 RS485-RX1, Pin30 RS485-TX1, Pin32 RS485-RE1), distance measurement (data interface Pin44 RS485-RX2, Pin45 RS485-TX2, Pin43 RS485-RE2) and infrared sensor value (data interface Pin11 Distance), it can be determined whether the gas sensor is wrapped or blocked. In the MSP430 interrupt service program, sensor information such as wind speed, illumination, ranging and infrared are collected once per second for 10 seconds. If it is wrapped or blocked, the measured wind speed will be lower than the normal value, the illumination will also be lower than the normal value, the distance to the reference object will be larger than the normal value, and the infrared will also be lower than the normal value. In this way, the difference between the values ​​of the wind speed, illumination, ranging and infrared sensors and the pre-set normal values ​​is used to determine whether it is wrapped or blocked. As long as the difference between the comparison values ​​of more than two sensors exceeds the threshold, it can be proved that the gas sensor is wrapped or blocked.

[0025] Assume that the measured wind speed values ​​are A1, A2, A3, A4, A5, A6, A7, A8, A9, A 10 , illumination values ​​B1, B2, B3, B4, B5, B6, B7, B8, B9, B 10 , distance values ​​C1, C2, C3, C4, C5, C6, C7, C8, C9, C 10 , infrared values ​​D1, D2, D3, D4, D5, D6, D7, D8, D9, D 10 and compare it with the stored normal value,

[0026] The mean square error of wind speed is calculated as follows:

[0027]

[0028] The mean square error of illumination is calculated as follows:

[0029]

[0030] The mean square error of the distance is calculated as follows:

[0031]

[0032] The mean square error of infrared is calculated as follows:

[0033]

[0034] if:

[0035] (ΔA≤0.5A andΔB≤0.5B)or(ΔA≤0.5A andΔC≥3C)

[0036] or(ΔB≤0.5B andΔC≥3C)or(ΔA≤0.5A andΔD≤0.5D)

[0037] or(ΔB≤0.5B andΔD≤0.5D)or(ΔC≥3C andΔD≤0.5D)

[0038] It can be determined that the gas sensor is wrapped or blocked, and the person who wrapped or blocked it can be determined by calling the personnel location information at that time. In this way, once it is determined that the gas sensor is wrapped or blocked, these data and the judgment results are immediately transmitted to the upper-level management and network center for processing.

[0039] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A mining gas sensor anti-wrapping device, characterized in that: include: A single-chip microcomputer, a gas sensor connected to the single-chip microcomputer, a vibration sensor, a wind speed sensor, an illumination sensor, a distance sensor and an infrared sensor; the anti-wrapping device of the mining gas sensor is structurally integrated with the mining gas sensor and is on the side of the gas sensor; among them, through the vibration, wind speed, illumination, distance and infrared sensing information and personnel information, it is judged whether the gas sensor is wrapped or blocked, and if so, by whom it is wrapped or blocked.

2. The anti-wrapping device for a mining gas sensor according to claim 1, characterized in that: The microcontroller CPU uses the low-power MSP430, and its power supply voltage is 1.8-3.6V.

3. The anti-wrapping device for a mining gas sensor as claimed in claim 2, characterized in that: When the microcontroller CPU runs at a 1MHz clock, the chip current is as low as 165μA, and the minimum power consumption in RAM retention mode is 0.1μA.

4. The anti-wrapping device for a mining gas sensor as claimed in claim 3, characterized in that: The microcontroller CPU is awakened from low power mode to active state by using its external interrupt form, and the external interrupt signal is the vibration sensor signal.

5. The anti-wrapping device for a mining gas sensor as claimed in claim 4, characterized in that: After the vibration sensor signal wakes up the MSP430, the MSP430CPU enters the interrupt service program and determines whether the gas sensor is wrapped or blocked by collecting wind speed, illumination, distance measurement and infrared sensor values.

6. The anti-wrapping device for a mining gas sensor as claimed in claim 5, characterized in that: In the MSP430 interrupt service program, the wind speed, illumination, ranging and infrared sensor information are first collected once a second for 10 seconds and compared with the stored normal value. If it is wrapped or blocked, the measured wind speed is less than the normal value, the illumination is also less than the normal value, the distance to the reference object is larger than the normal value, and the infrared is also less than the normal value. The difference between the wind speed, illumination, ranging and infrared sensor values ​​and the pre-set normal values ​​determines whether it is wrapped or blocked. If the difference between the comparison values ​​of more than two sensors exceeds the threshold, the gas sensor is wrapped or blocked. At the same time, the person who is wrapped or blocked is determined by calling the personnel positioning information at that time.

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