A coal mine conveyor belt early warning fire extinguishing device based on CO monitoring and its use method

Abstract

The present invention proposes a coal mine conveyor belt early warning fire extinguishing device based on CO monitoring and a method of use. The early warning fire extinguishing device includes a monitoring module, a fire extinguishing module and a power supply module respectively connected to the monitoring module and the fire extinguishing module. The monitoring module includes a CO gas monitoring module, the CO gas monitoring module is connected to a processing module, the processing module is respectively connected to a wireless transmission module, a temperature sensing module and a pressure control module, and the wireless transmission module signal is connected to a ground control console; the fire extinguishing module includes a nitrogen storage chamber and a retractable steering nozzle, the retractable steering nozzle is connected to the nitrogen storage chamber through a control valve, a temperature probe is provided on one side of the retractable steering nozzle, the temperature probe is connected to the temperature sensing module, and the control valve is connected to the pressure control module. The present invention solves the problem of delayed early warning and fire extinguishing of traditional conveyor belt fires, realizes the integrated monitoring and prevention of conveyor belt fires, and has low production and maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring and preventing coal mine conveyor belt fires, and in particular to a coal mine conveyor belt early warning fire extinguishing device based on CO monitoring and a use method thereof. Background Art

[0002] Coal is the main energy source in my country. The development of the coal industry is of great significance to the smooth implementation of the national sustainable strategy and the construction of a harmonious society. In the process of coal mining and transportation, the conveyor belt is the main tool for coal transportation. Its transmission distance is long, the operation mode is complex, the operating environment is harsh, and there are many failure factors. It is very easy to have accidents. Among them, fire is a relatively easy accident for coal mine conveyor belts.

[0003] There are three main reasons for conveyor belt fires. The first is roller slippage. For example, when the conveyor belt head is piled with coal, the conveyor belt is fully loaded and started, and the anti-skid rubber on the active roller is severely worn, the roller slippage and fire are likely to occur. The second is roller jamming. When the roller is jammed, the conveyor belt is prone to friction with the roller surface and heats up, thus catching fire. The third is external fire sources, such as short circuits in wires. In addition, after the conveyor belt stops, fires are also likely to occur because the lower roller is close to the roadway and is easily surrounded by coal powder. This shows that fires in coal mine conveyor belts are a relatively common occurrence, and coal mine conveyor belts need to be monitored in real time to provide timely warnings and extinguish fires.

[0004] At present, my country mainly uses smoke sensors, temperature sensors, infrared radiation temperature measurement, optical fiber temperature measurement and other technologies to realize fire monitoring and early warning of key parts such as the head and tail of the conveyor belt. However, the current smoke and temperature sensor detection technology still has great limitations. The false alarm rate is high when actually used on site, and the effect is very unsatisfactory; infrared radiation temperature measurement and optical fiber temperature measurement are more accurate, but the obstructions and coal dust between the infrared camera and the object being measured will affect the monitoring effect, and the cost is high and maintenance is difficult. In addition, the fire extinguishing method matched with the above monitoring technology is spray fire extinguishing, but after the spraying, the conveyor belt is basically in a scrapped state. Even if it can be put into use again, there is a slipping phenomenon caused by the dampness of the conveyor belt, which causes secondary fires, low safety and large losses. In addition, the existing monitoring device and fire extinguishing device are separately used for early warning and fire extinguishing. Usually, pipelines are required to connect the monitoring device and the fire extinguishing device. The early warning and fire extinguishing efficiency is not high, and the ideal early warning and fire extinguishing effect cannot be achieved. The construction and maintenance costs are high. Therefore, there is an urgent need for a coal mine conveyor belt early warning fire extinguishing device with good monitoring effect and high early warning fire extinguishing efficiency and a method of use. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention proposes a coal mine conveyor belt early warning fire extinguishing device based on CO monitoring, comprising a monitoring module, a fire extinguishing module and a power supply module respectively connected to the monitoring module and the fire extinguishing module, wherein the monitoring module comprises a CO gas monitoring module, the CO gas monitoring module is connected to a processing module, the processing module is respectively connected to a wireless transmission module, a temperature sensing module and a pressure control module, and the wireless transmission module signal is connected to a ground control console;

[0006] The fire extinguishing module includes a nitrogen storage chamber and a retractable steering nozzle, the retractable steering nozzle is connected to the nitrogen storage chamber through a control valve, a temperature probe is provided on one side of the retractable steering nozzle, the temperature probe is connected to the temperature sensing module, and the control valve is connected to the pressure control module.

[0007] Preferably, the fire extinguishing module, monitoring module and power supply module are all arranged on the explosion-proof housing, the processing module, wireless transmission module, temperature sensing module, pressure control module, nitrogen storage chamber and control valve are all located in the explosion-proof housing, the CO gas monitoring module is located on the outer wall of the explosion-proof housing, and the retractable steering nozzle and temperature probe are located above the outside of the explosion-proof housing;

[0008] The explosion-proof housing is provided with a nitrogen replenishing port, which is communicated with the nitrogen storage cavity, and a fixing device is provided on one side of the explosion-proof housing.

[0009] Preferably, the processing module, wireless transmission module, temperature sensing module and pressure control module are all embedded on a circuit board, and the circuit board is connected to the power supply module.

[0010] Preferably, the circuit board, power supply module and control valve are all arranged between the inner wall of the explosion-proof casing and the outer wall of the nitrogen storage chamber, the circuit board, CO gas monitoring module and power supply module are located on the side of the explosion-proof casing away from the fixing device, and the control valve is located at the top of the explosion-proof casing.

[0011] Preferably, the retractable steering nozzle comprises a nozzle and a retractable pipe, the nozzle is connected to one end of the retractable pipe, and the other end of the retractable pipe extends into the nitrogen storage chamber.

[0012] Preferably, the CO gas monitoring module comprises interdigital electrodes, on which CO gas sensing materials are coated, and the CO gas sensing materials comprise one or more of metal oxides, biopolymers and polyaniline.

[0013] Preferably, the CO gas sensing material comprises MBioF material and polyaniline, and the preparation of the interdigital electrode coated with the CO gas sensing material comprises the following steps:

[0014] S1. Take 2.5 mL of 10%-25% PDDA solution and add the PDDA solution into deionized water to prepare a 1%-3% PDDA solution.

[0015] S2. Weigh PSS powder, add the PSS powder to deionized water to prepare a PSS solution with a concentration of 1-3 mg / mL, then add an appropriate amount of concentrated hydrochloric acid to the PSS solution, and use a pH meter to measure the pH value of the PSS solution to 1;

[0016] S3, ultrasonically treating the PDDA solution and the PSS solution for 10-20 min for later use;

[0017] S4, immersing the interdigital electrode not coated with CO gas sensing material in the PDDA solution for 20-35 min to obtain a positively charged coating, then dripping the interdigital electrode with deionized water, blowing it dry with nitrogen after the dripping, and then immersing the interdigital electrode in the PSS solution for 20-30 min through electrostatic interaction to obtain a negatively charged coating on the interdigital electrode, then dripping the interdigital electrode with deionized water, and blowing it dry with nitrogen to complete the treatment of the interdigital electrode;

[0018] S5, weighing CuSO4·5H2O solid particles and dissolving them in distilled water to obtain a 70 mM CuSO4·5H2O solution;

[0019] S6, adding 2 equiv of sodium hydroxide to the racemic glutamic acid solution, and using the sodium hydroxide to deprotonate the racemic glutamic acid solution;

[0020] S7, subjecting the CuSO4·5H2O solution and the racemic glutamic acid solution to ultrasonic oscillation for 10-20 minutes respectively, mixing the two solutions after the oscillation, and subjecting them to ultrasonic oscillation for 10-20 minutes again to uniformly mix the two solutions, and finally allowing them to stand for aging for 10-48 hours, until a blue flocculent precipitate appears in the solution, which is the racemic glutamic acid nanofibers;

[0021] S8, centrifuging the solution containing racemic glutamate nanofibers at 9000 r / min-12000 r / min to separate the racemic glutamate nanofibers from the solution, washing the separated racemic glutamate nanofibers with distilled water for 3-5 times, and then drying for 24-72 hours, and then ultrasonically mixing the dried racemic glutamate nanofibers with distilled water to uniformly disperse them in the distilled water to obtain a Cu(II)-racemic glutamate nanofiber dispersion;

[0022] S9, adding aniline to the hydrogen chloride solution, and stirring the aniline and the hydrogen chloride solution at a temperature of 0-5° C. to obtain an aniline solution;

[0023] S10, adding the Cu(II)-racemic glutamic acid nanofiber dispersion to the aniline solution and rapidly stirring for 30 minutes to obtain a mixed solution;

[0024] S11, preparing 0.1-0.9 mol / L ammonium persulfate solution, adding the ammonium persulfate solution dropwise to the mixed solution and stirring, and stopping stirring after the solution turns light blue;

[0025] S12, inserting the treated interdigital electrode into the stirred solution, and taking out the interdigital electrode when the solution turns dark green;

[0026] S13, washing the interdigital electrode with HCl at a concentration of 1-3 mol / L, and drying the interdigital electrode at room temperature. At this time, the CO gas sensing material is attached to the interdigital electrode, and the preparation of the interdigital electrode is completed.

[0027] A method for using a coal mine conveyor belt early warning fire extinguishing device based on CO monitoring, comprising the following steps:

[0028] A1. Use fixing devices to install multiple early warning fire extinguishing devices on the brackets of the conveyor belt head, fuselage and tail;

[0029] A2. When the CO gas monitoring module detects CO gas, the resistance of the CO gas monitoring module changes, thereby generating a current change signal. The current signal is transmitted to the processing module for operational amplification, and then the wireless transmission module transmits the amplified current signal to the ground control console. The ground control console issues an alarm. At the same time, the temperature probe detects the ambient temperature and transmits the temperature information to the temperature sensing module. When the temperature is too high, the temperature sensing module transmits the high temperature signal to the processing module. The processing module transmits instructions to the retractable steering nozzle. The retractable steering nozzle adjusts the nozzle toward the abnormal temperature area by retracting and rotating.

[0030] A3. When the retractable steering nozzle is adjusted, the processing module transmits instructions to the pressure control module, the pressure control module controls the control valve to open, the nitrogen storage chamber injects nitrogen into the retractable steering nozzle, and the nitrogen is ejected from the nozzle to extinguish the fire;

[0031] A4. While injecting nitrogen, the control valve will detect the nitrogen pressure information and transmit the pressure information to the pressure control module. The pressure control module will transmit the pressure information after the nitrogen injection to the processing module. The processing module will calculate and determine the remaining amount of gas in the nitrogen storage chamber according to the pressure information. Then, the processing module will transmit the nitrogen remaining amount information to the ground control console through the wireless transmission module, and the ground control console will broadcast the remaining gas amount of each early warning fire extinguishing device;

[0032] A5. The ground control console automatically simulates the fire time and fire process of the conveyor belt based on the time when the CO gas monitoring module detects CO gas and the change in gas content in the nitrogen storage chamber of each equipment, and based on the big data of coal mine conveyor belt fires.

[0033] Preferably, the ground control console includes a computer and an alarm, the computer is connected to the alarm, and the wireless transmission module is connected to the computer signal.

[0034] Preferably, the temperature probe is an acoustic wave detection probe, and the acoustic wave feedback information of the coal mine conveyor belt when no fire occurs and the acoustic wave feedback information when the temperature of the coal mine conveyor belt rises are preset in the ground control console. The acoustic wave feedback information of the temperature when a fire occurs in the coal mine conveyor belt is used as the threshold, and the feedback information of the acoustic wave detection of the temperature probe is used to determine whether a fire occurs in the coal mine conveyor belt and the location of the fire.

[0035] The present invention has the following beneficial effects:

[0036] 1. The present invention transmits the collected CO concentration information to the ground control console by wireless transmission through the wireless transmission module. The ground control console issues a fire warning, and the retractable steering nozzle quickly and accurately handles the fire point under the guidance of the temperature probe. The present invention solves the problem of delayed fire warning and fire extinguishing in traditional conveyor belts, and realizes the integrated monitoring and prevention of conveyor belt fires.

[0037] 2. The CO gas sensing material of the present invention can detect CO with an accuracy of less than 10 PPM and has excellent gas responsiveness. It is a new type of CO monitoring material and provides a reference for the development of CO monitoring materials.

[0038] 3. The present invention adopts compressed nitrogen to extinguish fire, thus solving the problem that the conveyor belt is scrapped due to water spraying fire extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a side view of the device of the present invention;

[0040] Figure 2 is a front cross-sectional view of the device of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the monitoring module of the present invention;

[0042] Figure 4 This is a schematic diagram of an interdigital electrode with a CO gas sensing material attached to the present invention;

[0043] Figure 5 This is a schematic diagram of the fire extinguishing state of the device of the present invention;

[0044] Figure 6This is a schematic diagram of the use state of the device of the present invention;

[0045] Figure 7 This is a resistance / time response diagram of the PANI / MBioF material of the present invention when sensing CO;

[0046] Figure 8 This is a simulation test diagram of 50ppm concentration CO gas of the CO gas monitoring device of the present invention.

[0047] Numbers in the figure: 1-CO gas monitoring module, 2-processing module, 3-wireless transmission module, 4-temperature sensing module, 5-pressure control module, 6-nitrogen storage chamber, 7-temperature probe, 8-retractable steering nozzle, 9-control valve, 10-explosion-proof housing, 11-circuit board, 12-nitrogen supplement port, 13-power supply module, 14-fixing device, 15-ground control console. DETAILED DESCRIPTION

[0048] In order to make the present invention clearer and more understandable, the technical solution of the present invention is further described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the given embodiment is only one implementation method and does not represent all embodiments.

[0049] In this article, the terms "left, right, up, down" and the like are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection.

[0050] Combined with Figure 1-8 A coal mine conveyor belt early warning fire extinguishing device based on CO monitoring, comprising a monitoring module, a fire extinguishing module and a power supply module 13 respectively connected to the monitoring module and the fire extinguishing module, the power supply module 13 is an intelligent power supply module, which can automatically adjust the power supply, the monitoring module comprises a CO gas monitoring module 1, the CO gas monitoring module 1 is connected to a processing module 2, the processing module 2 is respectively connected to a wireless transmission module 3, a temperature sensing module 4 and a pressure control module 5, and the wireless transmission module 3 signal is connected to a ground control console 15;

[0051] The fire extinguishing module includes a nitrogen storage chamber 6 and a retractable steering nozzle 8, the retractable steering nozzle 8 is connected to the nitrogen storage chamber 6 through a control valve 9, a temperature probe 7 is provided on one side of the retractable steering nozzle 8, the temperature probe 7 is connected to the temperature sensing module 4, and the control valve 9 is connected to the pressure control module 5.

[0052] Specifically, the fire extinguishing module, the monitoring module and the power supply module are all arranged on the explosion-proof housing 10, the processing module 2, the wireless transmission module 3, the temperature sensing module 4, the pressure control module 5, the nitrogen storage chamber 6 and the control valve 9 are all located in the explosion-proof housing 10, the CO gas monitoring module 1 is located on the outer wall of the explosion-proof housing 10, and the retractable steering nozzle 8 and the temperature probe 7 are located above the outside of the explosion-proof housing 10;

[0053] The explosion-proof housing 10 is provided with a nitrogen replenishing port 12 , which is connected to the nitrogen storage chamber 6 . A fixing device 14 is provided on one side of the explosion-proof housing 10 , and nitrogen is replenished into the nitrogen storage chamber 6 through the nitrogen replenishing port 12 .

[0054] Specifically, the processing module 2 , the wireless transmission module 3 , the temperature sensing module 4 and the pressure control module 5 are all embedded on a circuit board 11 , and the circuit board 11 is connected to a power supply module 13 .

[0055] Specifically, the circuit board 11, the power supply module 13 and the control valve 9 are all arranged between the inner wall of the explosion-proof casing 10 and the outer wall of the nitrogen storage chamber 6. The circuit board 11, the CO gas monitoring module 1 and the power supply module 13 are located on the side of the explosion-proof casing 10 away from the fixing device 14, and the control valve 9 is located at the top inside the explosion-proof casing 10.

[0056] Specifically, the retractable steering nozzle 8 includes a nozzle and a retractable pipe, the nozzle is connected to one end of the retractable pipe, and the other end of the retractable pipe extends into the nitrogen storage chamber 6. More specifically, the specific structure of the retractable steering nozzle 8 can be: the retractable pipe includes a mounting tube and a telescopic tube, one end of the mounting tube extends into the nitrogen storage chamber 6, one end of the telescopic tube is slidably inserted into the other end of the mounting tube, a nozzle and a temperature probe 7 are installed on the other end of the telescopic tube, a bearing and a gear ring are provided on the telescopic tube, the inner ring of the bearing is fixed on the outer wall of the telescopic tube, and the outer ring of the bearing is fixedly connected with a connecting plate, and the anti- A motor and an electric push rod are installed on the outer wall of the top end of the explosion-proof shell 10, the bottom end of the electric push rod is connected to the explosion-proof shell 10, the pushing end of the electric push rod is connected to the connecting plate, the gear ring is mounted on the outer wall of the telescopic tube, the bottom end of the motor is connected to the explosion-proof shell 10, a gear is installed on the output end of the motor, the gear is meshed with the gear ring, when the electric push rod is working, it can push the telescopic tube to extend and retract, when the motor is working, the telescopic tube can be driven to rotate through the meshing of the gear and the gear ring, the electric push rod and the motor can work at the same time, thereby realizing the rotation and extension of the telescopic steering nozzle 8, the specific structure of the telescopic steering nozzle 8 is not limited to the above content.

[0057] Specifically, the CO gas monitoring module 1 includes interdigital electrodes coated with CO gas sensing materials, the CO gas sensing materials including one or more of metal oxides such as CuSO4, biopolymers such as racemic glutamic acid, and polyaniline, the CO gas sensing materials are used to sense and adsorb CO, and at the same time, the resistance of the interdigital electrodes will change according to the amount of induced adsorbed CO, thereby changing the current of the interdigital electrodes, and the processing module 2 can determine whether a fire occurs according to the current change of the interdigital electrodes.

[0058] Specifically, the CO gas sensing material includes MBioF material and polyaniline, and the preparation of the interdigital electrode coated with the CO gas sensing material includes the following steps:

[0059] Before preparation, the utensils used in the preparation process are cleaned by water bath ultrasonic cleaning with deionized water, ethanol, and deionized water in turn, and the ultrasonic cleaning is carried out for 10-20 minutes. After the ultrasonic cleaning is completed, they are placed in a drying oven at a constant temperature of 70°C for drying for use. The interdigital electrodes need to be treated by anion-cation combination method, such as steps S1-S4:

[0060] S1. Take 2.5 mL of 10%-25% PDDA solution and add the PDDA solution into deionized water to prepare a 1%-3% PDDA solution.

[0061] S2. Weigh PSS powder, add PSS powder to deionized water to prepare a PSS solution with a concentration of 1-3 mg / mL, then use a rubber-tipped dropper to drop an appropriate amount of concentrated hydrochloric acid into the PSS solution, and use a pH meter to measure the pH value of the PSS solution to 1;

[0062] S3, ultrasonically treating the PDDA solution and the PSS solution for 10-20 min for later use;

[0063] S4, immersing the interdigital electrode not coated with the CO gas sensing material in the PDDA solution for 20-35 min to obtain a positively charged coating, then using a rubber-tipped dropper to absorb deionized water to drip-wash the interdigital electrode, blowing the interdigital electrode dry with nitrogen after the drip-washing, and then immersing the interdigital electrode in the PSS solution for 20-30 min through electrostatic interaction to obtain a negatively charged coating on the interdigital electrode, that is, obtaining another layer of negatively charged coating on the positively charged coating, then drip-washing the interdigital electrode with deionized water, and blowing the interdigital electrode dry with nitrogen to complete the treatment of the interdigital electrode;

[0064] The CO gas sensing material includes MBioF material and polyaniline (PANI), and the CO gas sensing material is PANI / MBioF material. The preparation steps of the CO gas sensing material are as shown in S5-S13:

[0065] S5, weighing CuSO4·5H2O solid particles and dissolving them in distilled water to obtain a 70 mM CuSO4·5H2O solution;

[0066] S6, adding 2 equiv of sodium hydroxide to the racemic glutamic acid solution, using the sodium hydroxide to deprotonate the racemic glutamic acid solution, the racemic glutamic acid solution and the CuSO4·5H2O solution being equal in amount;

[0067] S7, subjecting the CuSO4·5H2O solution and the racemic glutamic acid solution to ultrasonic oscillation for 10-20 minutes respectively, mixing the two solutions after the oscillation, and subjecting them to ultrasonic oscillation for 10-20 minutes again to uniformly mix the two solutions, and finally allowing them to stand for aging for 10-48 hours, until a blue flocculent precipitate appears in the solution, which is the racemic glutamic acid nanofibers;

[0068] S8, centrifuging the solution containing racemic glutamate nanofibers at 9000 r / min-12000 r / min to separate the racemic glutamate nanofibers from the solution, washing the separated racemic glutamate nanofibers with distilled water for 3-5 times, and then drying for 24-72 hours, and then ultrasonically mixing the dried racemic glutamate nanofibers with distilled water to uniformly disperse them in the distilled water to obtain a Cu(II)-racemic glutamate nanofiber dispersion, wherein the Cu(II)-racemic glutamate nanofibers are MBioF materials;

[0069] S9, adding aniline to a hydrogen chloride (HCL) solution, and stirring the aniline and the hydrogen chloride solution at a temperature of 0-5°C to obtain an aniline solution. Specifically, the aniline and the hydrogen chloride solution can be placed in an ice-water bath in a magnetic stirring water bath to keep the two in a temperature environment of 0-5°C;

[0070] S10, adding the Cu(II)-racemic glutamic acid nanofiber dispersion to the aniline solution and rapidly stirring for 30 minutes to obtain a mixed solution;

[0071] S11, prepare 0.1-0.9 mol / L ammonium persulfate solution, slowly add the ammonium persulfate solution dropwise to the mixed solution, the dropping process is completed within 2-5 minutes, and the two solutions are stirred. As the stirring proceeds, it can be observed that the solution gradually changes from pink to light blue, and the stirring is stopped after the solution changes to light blue;

[0072] S12, insert the treated interdigital electrode into the stirred solution and wait for about 30 minutes, and take out the interdigital electrode when the solution turns dark green;

[0073] S13. Wash the interdigital electrodes with 1-3 mol / L HCl and dry the interdigital electrodes at room temperature. At this time, CO gas sensing material is attached to the interdigital electrodes, and the preparation of the interdigital electrodes is completed. The CO gas sensing material attached to the interdigital electrodes is a CO gas-sensitive film. The preparation of the CO gas sensing material and the process of attaching it to the interdigital electrodes adopt a self-assembly in-situ polymerization method.

[0074] Specifically, the MBioF material provides an attachment framework for polyaniline and enhances its conductivity. The PANI / MBioF material can provide more adsorption sites for CO as a polymer skeleton, which is beneficial to the adsorption of CO. The CO gas-sensitive film can filter out other dust such as coal dust and is easy to replace.

[0075] A method for using a coal mine conveyor belt early warning fire extinguishing device based on CO monitoring, comprising the following steps:

[0076] A1. Multiple early warning fire extinguishing devices are respectively installed on the brackets of key parts such as the conveyor head, fuselage, and tail through the fixing device 14. Multiple early warning fire extinguishing devices are set on the fuselage. The interval between two adjacent early warning fire extinguishing devices on the fuselage is 2-5m. The fixing device 14 can adopt an electromagnetic adsorption device. The early warning fire extinguishing device can be adsorbed on the conveyor bracket through the fixing device 14;

[0077] A2. When the CO gas monitoring module 1 detects CO gas, the resistance of the CO gas monitoring module 1 changes, thereby generating a current change signal. The current signal is transmitted to the processing module 2 for operational amplification, and then the wireless transmission module 3 transmits the amplified current signal to the ground control console 15. The ground control console 15 issues an alarm. At the same time, the temperature probe 7 detects the ambient temperature and transmits the temperature information to the temperature sensing module 4. When the temperature is too high, the temperature sensing module 4 transmits the high temperature signal to the processing module 2. The processing module 2 transmits the instruction to the retractable steering nozzle 8. The retractable steering nozzle 8 adjusts the nozzle toward the abnormal temperature area by retracting and rotating;

[0078] A3. When the retractable steering nozzle 8 is adjusted, the processing module 2 transmits instructions to the pressure control module 5. The pressure control module 5 controls the control valve 9 to open, and the nitrogen storage chamber 6 injects nitrogen into the retractable steering nozzle 8. The nitrogen is sprayed from the nozzle to extinguish the fire.

[0079] A4. While injecting nitrogen, the control valve 9 will detect the nitrogen pressure information and transmit the pressure information to the pressure control module 5. The pressure control module 5 will transmit the pressure information after the nitrogen injection to the processing module 2. The processing module 2 will calculate and determine the remaining amount of gas in the nitrogen storage chamber 6 according to the pressure information. Then the processing module 2 will transmit the nitrogen remaining amount information to the ground control console 15 through the wireless transmission module 3. The ground control console 15 will broadcast the remaining gas amount of the early warning fire extinguishing devices at various locations. More specifically, the ground control console 15 can number the early warning fire extinguishing devices installed at various positions of the conveyor belt, and broadcast when the remaining amount of gas in the nitrogen storage chamber is less than 10%;

[0080] A5. The ground control console automatically simulates the conveyor belt fire time and fire process based on the time when the CO gas monitoring module 1 detects CO gas and the change value of the gas content in the nitrogen storage chamber 6 of each equipment, and uses the coal mine conveyor belt fire big data as the basis to provide a reference for accident research. Specifically, the coal mine conveyor belt fire big data is a data statistics of the existing coal mine conveyor belt fire conditions.

[0081] Specifically, the ground control console 15 includes a computer and an alarm, the computer is connected to the alarm, and the wireless transmission module 3 is connected to the computer signal.

[0082] Specifically, the temperature probe 7 is an acoustic wave detection probe. The acoustic wave feedback information of the coal mine conveyor belt when no fire occurs and the acoustic wave feedback information when the temperature of the coal mine conveyor belt rises are preset in the ground control console 15. The acoustic wave feedback information of the temperature when the coal mine conveyor belt will have a fire is used as the threshold. According to the feedback information of the acoustic wave detection of the temperature probe 7, it is judged whether the coal mine conveyor belt has a fire and the location of the fire. The processing module 2 can know the location of the fire on the conveyor belt through the temperature probe 7, so as to control the retractable steering nozzle 8 to face the direction of the fire. Taking the aforementioned retractable steering nozzle 8 structure as an example, the processing module 2 can control the retractable steering nozzle 8 to face the direction of the fire by controlling the pushing stroke parameters of the electric push rod in the retractable steering nozzle 8 and the motor rotation parameters. The temperature probe 7 obtains the nitrogen injection direction and nitrogen injection amount of the early warning fire extinguishing device based on the real-time monitoring of the fire point. Since the early warning fire extinguishing device is provided at the head, body and tail of the coal mine conveyor belt, nitrogen can be injected locally at different positions of the conveyor belt according to different fire conditions to avoid waste. After the nitrogen injection is completed, the conveyor belt can still be put into use again.

[0083] The above embodiments are only to illustrate the basic principles and characteristics of the present invention, but are not limited to the above embodiments. It should be understood that for ordinary technicians in this field, various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and these changes and modifications fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A coal mine conveyor belt early warning fire extinguishing device based on CO monitoring, comprising a monitoring module, a fire extinguishing module and a power supply module (13) connected to the monitoring module and the fire extinguishing module respectively, characterized in that: The monitoring module comprises a CO gas monitoring module (1), the CO gas monitoring module (1) is connected to a processing module (2), the processing module (2) is respectively connected to a wireless transmission module (3), a temperature sensing module (4) and a pressure control module (5), and the wireless transmission module (3) is signal-connected to a ground control console (15); The fire extinguishing module comprises a nitrogen storage chamber (6) and a retractable steering nozzle (8), the retractable steering nozzle (8) being connected to the nitrogen storage chamber (6) via a control valve (9), a temperature probe (7) being provided on one side of the retractable steering nozzle (8), the temperature probe (7) being connected to the temperature sensing module (4), and the control valve (9) being connected to the pressure control module (5); The CO gas monitoring module (1) comprises interdigital electrodes, on which a CO gas sensing material is coated, wherein the CO gas sensing material comprises one or more of metal oxides, biopolymers and polyaniline; The preparation of the interdigital electrode coated with the CO gas sensing material comprises the following steps: S1. Take 2.5 mL of 10%-25% PDDA solution and add the PDDA solution into deionized water to prepare a 1%-3% PDDA solution. S2. Weigh PSS powder, add the PSS powder to deionized water to prepare a PSS solution with a concentration of 1-3 mg / mL, then add an appropriate amount of concentrated hydrochloric acid to the PSS solution, and use a pH meter to measure the pH value of the PSS solution to 1; S3, ultrasonically treat the PDDA solution and the PSS solution for 10-20 min for later use; S4, immersing the interdigital electrode not coated with CO gas sensing material in the PDDA solution for 20-35 min to obtain a positively charged coating, then dripping the interdigital electrode with deionized water, blowing it dry with nitrogen after the dripping, and then immersing the interdigital electrode in the PSS solution for 20-30 min through electrostatic interaction to obtain a negatively charged coating on the interdigital electrode, then dripping the interdigital electrode with deionized water, and blowing it dry with nitrogen to complete the treatment of the interdigital electrode; S5, weighing CuSO4·5H2O solid particles and dissolving them in distilled water to obtain a 70 mM CuSO4·5H2O solution; S6, adding 2 equiv of sodium hydroxide to the racemic glutamic acid solution, and using the sodium hydroxide to deprotonate the racemic glutamic acid solution; S7, subjecting the CuSO4·5H2O solution and the racemic glutamic acid solution to ultrasonic oscillation for 10-20 minutes respectively, mixing the two solutions after the oscillation, and subjecting them to ultrasonic oscillation for 10-20 minutes again to uniformly mix the two solutions, and finally allowing them to stand for aging for 10-48 hours, until a blue flocculent precipitate appears in the solution, which is the racemic glutamic acid nanofibers; S8, centrifuging the solution containing racemic glutamate nanofibers at 9000 r / min-12000 r / min to separate the racemic glutamate nanofibers from the solution, washing the separated racemic glutamate nanofibers with distilled water for 3-5 times, and then drying for 24-72 hours, and then ultrasonically mixing the dried racemic glutamate nanofibers with distilled water to uniformly disperse them in the distilled water to obtain a Cu(II)-racemic glutamate nanofiber dispersion; S9, adding aniline to the hydrogen chloride solution, and stirring the aniline and the hydrogen chloride solution at a temperature of 0-5° C. to obtain an aniline solution; S10, adding the Cu(II)-racemic glutamic acid nanofiber dispersion to the aniline solution and rapidly stirring for 30 minutes to obtain a mixed solution; S11, preparing 0.1-0.9 mol / L ammonium persulfate solution, adding the ammonium persulfate solution dropwise to the mixed solution and stirring, and stopping stirring after the solution turns light blue; S12, inserting the treated interdigital electrode into the stirred solution, and taking out the interdigital electrode when the solution turns dark green; S13, washing the interdigital electrode with HCl at a concentration of 1-3 mol / L, and drying the interdigital electrode at room temperature. At this time, the CO gas sensing material is attached to the interdigital electrode, and the preparation of the interdigital electrode is completed.

2. According to claim 1, a coal mine conveyor belt early warning fire extinguishing device based on CO monitoring is characterized in that: The fire extinguishing module, monitoring module and power supply module are all arranged on the explosion-proof housing (10); the processing module (2), the wireless transmission module (3), the temperature sensing module (4), the pressure control module (5), the nitrogen storage chamber (6) and the control valve (9) are all located in the explosion-proof housing (10); the CO gas monitoring module (1) is located on the outer wall of the explosion-proof housing (10); and the retractable steering nozzle (8) and the temperature probe (7) are located above the outside of the explosion-proof housing (10); The explosion-proof housing (10) is provided with a nitrogen supply port (12), the nitrogen supply port (12) is in communication with the nitrogen storage chamber (6), and a fixing device (14) is provided on one side of the explosion-proof housing (10).

3. A coal mine conveyor belt early warning fire extinguishing device based on CO monitoring according to claim 2, characterized in that: The processing module (2), the wireless transmission module (3), the temperature sensing module (4) and the pressure control module (5) are all embedded in a circuit board (11), and the circuit board (11) is connected to the power supply module (13).

4. The coal mine conveyor belt early warning fire extinguishing device based on CO monitoring according to claim 3 is characterized by: The circuit board (11), the power supply module (13) and the control valve (9) are all arranged between the inner wall of the explosion-proof housing (10) and the outer wall of the nitrogen storage chamber (6); the circuit board (11), the CO gas monitoring module (1) and the power supply module (13) are located on a side of the explosion-proof housing (10) away from the fixing device (14); and the control valve (9) is located at the top of the explosion-proof housing (10).

5. The coal mine conveyor belt early warning fire extinguishing device based on CO monitoring according to claim 1 is characterized by: The retractable steering nozzle (8) comprises a nozzle and a retractable pipe, the nozzle is connected to one end of the retractable pipe, and the other end of the retractable pipe extends into the nitrogen storage chamber (6).

6. A method for using the coal mine conveyor belt early warning fire extinguishing device based on CO monitoring according to any one of claims 1 to 5, characterized in that: The following steps are involved: A1. Using a fixing device (14), a plurality of early warning fire extinguishing devices are respectively installed on brackets at the front, the body and the tail of the conveyor belt; A2. When the CO gas monitoring module (1) detects CO gas, the resistance of the CO gas monitoring module (1) changes, thereby generating a current change signal. The current signal is transmitted to the processing module (2) for operational amplification, and then the wireless transmission module (3) transmits the amplified current signal to the ground control console (15). The ground control console (15) issues an alarm. At the same time, the temperature probe (7) detects the ambient temperature and transmits the temperature information to the temperature sensing module (4). When the temperature is too high, the temperature sensing module (4) transmits the high temperature signal to the processing module (2). The processing module (2) transmits a command to the retractable steering nozzle (8). The retractable steering nozzle (8) adjusts the nozzle toward the abnormal temperature area by retracting and rotating. A3. When the retractable steering nozzle (8) is adjusted, the processing module (2) transmits a command to the pressure control module (5), and the pressure control module (5) controls the control valve (9) to open, and the nitrogen storage chamber (6) injects nitrogen into the retractable steering nozzle (8), and the nitrogen is ejected from the nozzle to extinguish the fire; A4. While nitrogen is being injected, the control valve (9) detects nitrogen pressure information and transmits the pressure information to the pressure control module (5). The pressure control module (5) transmits the pressure information after nitrogen injection to the processing module (2). The processing module (2) calculates and determines the remaining amount of gas in the nitrogen storage chamber (6) based on the pressure information. The processing module (2) then transmits the information on the remaining amount of nitrogen to the ground control console (15) via the wireless transmission module (3). The ground control console (15) then broadcasts the remaining amount of gas in each early warning fire extinguishing device. A5. The ground control console automatically simulates the time when the CO gas is detected by the CO gas monitoring module (1) and the change value of the gas content in the nitrogen storage chamber (6) of each equipment, and automatically simulates the conveyor belt fire time and fire process based on the coal mine conveyor belt fire big data.

7. The method for using the coal mine conveyor belt early warning fire extinguishing device based on CO monitoring according to claim 6 is characterized by: The ground control console (15) comprises a computer and an alarm, the computer is connected to the alarm, and the wireless transmission module (3) is connected to the computer signal.

8. The method for using the coal mine conveyor belt early warning fire extinguishing device based on CO monitoring according to claim 6 is characterized by: The temperature probe (7) is a sound wave detection probe. Sound wave feedback information of the coal mine conveyor belt when no fire occurs and sound wave feedback information when the temperature of the coal mine conveyor belt rises are preset in the ground control console (15). The sound wave feedback information of the temperature when a fire occurs in the coal mine conveyor belt is used as a threshold value. Based on the feedback information of the sound wave detection of the temperature probe (7), it is determined whether a fire occurs in the coal mine conveyor belt and the location of the fire.

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