Coal mine underground fireproof device

Abstract

The utility model provides an underground fire protection device for a coal mine. The underground fire protection device comprises a controller; a sensing chamber is arranged in the gas monitoring module, a gas sensor is arranged in the sensing chamber, a gas inlet pipe is arranged on the gas monitoring module, a fan is arranged on the gas inlet pipe, and the gas inlet pipe leads to the sensing chamber; the fireproof module is arranged on the wall face, a plastic film roll is arranged in the fireproof module, one end of the plastic film roll is fixed to the inner wall of the fireproof module, one end of a bottom plate of the fireproof module is hinged to the side plate close to the wall face, and the other end of the bottom plate of the fireproof module is provided with an iron sheet and attached to the side plate above through an electromagnet. According to the underground fire prevention device for the coal mine, the timeliness of fire early warning is improved by reducing the influence of underground dust on the gas sensor; the plastic film is laid in time, oxygen supply is reduced, coal spontaneous combustion development is slowed down or even blocked, and the effectiveness of fire prevention and control is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine fire fighting technical field especially, relates to a coal mine underground fire prevention device. BACKGROUND

[0002] Coal mine fire is one of the main disasters that restricts the safety production of coal mine. Coal spontaneous combustion is one of the main reasons of coal mine fire. Coal spontaneous combustion seriously threatens the safety production of coal mine and restricts the production of coal mine. For the fire caused by coal spontaneous combustion, the fire source often comes from underground coal seam, and the fire source location is hidden, and it is difficult to detect and monitor the fire source, especially for the positions such as goaf and blind lane that are not easy to reach by conventional means.

[0003] The existing technical means are mostly related to releasing, spraying and injecting fire extinguishing substances (such as nitrogen or fire extinguishing gel, etc.) to achieve the purpose of fire prevention when the underground gas concentration is found to be abnormal. Since the fire source comes from underground coal seam, when the underground gas concentration is found to be abnormal on the ground surface, coal spontaneous combustion has developed to a considerable extent, and the purpose of timely detecting coal spontaneous combustion has not been achieved. There is a large amount of dust underground, which seriously affects the accuracy and service life of the gas sensor, and may affect the timeliness of fire warning.

[0004] In addition, since it is difficult to find the real fire location, the release of fire extinguishing substances is actually blind, a large amount of fire extinguishing materials is wasted, and the cost is quite high. Moreover, due to the large consumption of fire extinguishing substances, it is not possible to store a large amount of fire extinguishing substances underground, and it is not possible to achieve real effective fire prevention and control.

[0005] The utility model attempts to provide a coal mine underground fire prevention device, which improves the existing coal mine underground fire prevention device, attempts to improve the timeliness of fire warning and improve the effectiveness of fire prevention and control. CONTENT OF THE UTILITY MODEL

[0006] The utility model attempts to provide a coal mine underground fire prevention device, which improves the existing coal mine underground fire prevention device, attempts to improve the timeliness of fire warning and improve the effectiveness of fire prevention and control.

[0007] The utility model provides a coal mine underground fire prevention device, include: controller, gas monitoring module is provided with sensing chamber in gas monitoring module, be provided with gas sensor in sensing chamber, be provided with air inlet pipe on gas monitoring module, be provided with fan on air inlet pipe and air inlet pipe leads to sensing chamber, fire prevention module, fire prevention module sets up on wall surface, is provided with plastic film roll in fire prevention module, one end of plastic film roll is fixed with the inner wall of fire prevention module, one end of the bottom plate of fire prevention module is hinged with the side plate close to wall surface, the other end is provided with iron sheet and is pasted with the side plate above through the electromagnet, wherein, when gas monitoring module senses that one or some gas concentration is overproof, controller is powered off to electromagnet, the bottom plate opens, and plastic film roll rolls down and spreads.

[0008] Further, the air inlet of the air inlet pipe is provided with an air inlet cover, the air inlet cover is conical, and a protrusion is arranged on the inner surface of the air inlet cover.

[0009] Further, the air inlet cover is made of elastic material.

[0010] Further, a filter cartridge net is arranged at the air inlet, the filter cartridge net comprises an air inlet filter screen and a filter cartridge extending from the air inlet filter screen, an air outlet hole is arranged on the filter cartridge, the air inlet filter screen is embedded in the air inlet, and the filter cartridge extends in the air inlet pipe.

[0011] Further, the air outlet hole is arranged on the side surface of the filter cartridge.

[0012] Further, an internal filter screen is arranged in the air inlet pipe downstream of the filter cartridge net.

[0013] Further, a bend filter screen is arranged at the bend of the air inlet pipe, and the fan is arranged downstream of the bend.

[0014] The coal mine underground fire prevention device provided by the utility model reduces the influence of underground dust on the gas sensor, improves the timeliness of fire warning, lays plastic film in time to reduce oxygen supply, slows down or even blocks the development of coal spontaneous combustion, and improves the effectiveness of fire prevention and control. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a structural schematic diagram of a coal mine underground fire prevention device according to an embodiment of the utility model.

[0016] Figure 2 Fig. 2 is a schematic diagram of the plastic film in the embodiment of the utility model. Figure 1 Fig. 3 is a schematic diagram of the plastic film when it is unfolded in the embodiment of the utility model.

[0017] Figure 3 Fig. 4 is a change schematic diagram of the plastic film covering coal blocks.

[0018] Figure 4A structural diagram of a gas monitoring module is shown.

[0019] Figure 5 A structural diagram of a filter cartridge screen is shown.

[0020] Figure 6 A structural diagram of an air inlet cover is shown.

[0021] Reference signs:

[0022] 1: wall surface

[0023] 2: gas monitoring module; 21: housing; 22: air inlet; 23: air inlet pipe; 231: air inlet cover; 2311: protrusion; 232: filter cartridge screen; 2321: air inlet filter screen; 23211: air outlet hole; 2322: filter cartridge; 233: internal filter screen; 234: elbow filter screen; 24: fan; 25: sensing chamber; 251: gas sensor; 252: air outlet

[0024] 3: fireproof module; 31: housing; 311: bottom plate; 32: plastic film (roll); 33: electromagnet; 34: iron sheet

[0025] 5: coal block DETAILED DESCRIPTION

[0026] In order to have a further understanding of the purpose, structure, features, and functions of the present application, the following detailed description is provided in conjunction with the embodiments.

[0027] Figure 1 A structural diagram of the coal mine underground fireproof device of the present application embodiment is shown. Figure 2 A structural diagram of the coal mine underground fireproof device of the present application embodiment is shown. Figure 1 A schematic diagram of the plastic film when it is unfolded in the shown embodiment is shown. Figure 3 A change schematic diagram of the plastic film covering the coal block is shown. Figure 4 A structural diagram of a gas monitoring module is shown. Figure 5 A structural diagram of a filter cartridge screen is shown. Figure 6 A structural diagram of an air inlet cover is shown.

[0028] As shown in Figure 1 , Figure 2 or Figure 4 The present application embodiment provides a coal mine underground fireproof device, which comprises a controller, the controller can be arranged at a suitable position, for example, arranged in a gas detection module 1; the gas monitoring module 1, such as Figure 4As shown, the gas monitoring module 1 is provided with a sensing chamber 25, and the sensing chamber 25 is provided with a gas sensor 251, which can be one or more gas sensors, such as a gas sensor and / or a carbon monoxide sensor, and the gas monitoring module 1 is provided with an air inlet pipe 23, and the air inlet pipe 23 is provided with a fan 24 and leads to the sensing chamber 25, and the air inlet pipe 23 introduces underground gas into the sensing chamber 25 and is sensed by the gas sensor 251 to determine whether to perform a fire prevention operation; the fire prevention module 3 is arranged on the wall surface 1, and the gas monitoring module 1 can be arranged on the fire prevention module 3, and the fire prevention module is internally provided with a plastic film roll 32, one end of the plastic film roll 32 is fixed to the inner wall of the fire prevention module 1, one end of the bottom plate 311 of the fire prevention module 3 is hinged to the side plate close to the wall surface 1, the other end is provided with an iron sheet 34 and is attached to the upper side plate under the magnetic attraction force through an electromagnet 33, and the electromagnet 33 is arranged on the upper side plate; wherein, when the gas monitoring module 1 senses that the concentration of one or more gases exceeds the standard, the controller de-energizes the electromagnet 33, the bottom plate 311 is opened, and the plastic film roll 32 rolls down and spreads.

[0029] When the gas monitoring module 1 does not monitor that the gas concentration exceeds the standard, the bottom plate 311 is attached to the upper side plate through the action of the electromagnet 33, and the bottom plate 311 is in a closed state; when the gas monitoring module 1 senses that the concentration of one or more gases exceeds the standard, the controller de-energizes the electromagnet 33, as shown in Figure 2 The bottom plate 311 is opened, and the plastic film roll 32 can roll down and spread under its own gravity.

[0030] For coal spontaneous combustion, the ignition point is often located in the coal seam below the ground surface, and the oxygen supply required for combustion is mainly due to the leakage of cracks connected to the outside, therefore, by laying a plastic film on the surface of the coal seam, the oxygen supply required for coal spontaneous combustion can be effectively weakened or even blocked. In this regard, it has been recorded in the prior art documents, for example, “Study on Prevention and Control Technology of Spontaneous Combustion in Gob of Shallow Depth L-type Fully Mechanized Caving Face” (Kang Jian-ting et al., Coal Science and Technology, pages 129-134, April 1, 2018), discloses a three-way pipe for filling in a mine, and specifically discloses (see pages 129-134) that a plastic film is used to fully cover the ground surface of the gob for treating spontaneous combustion in the gob.

[0031] In the embodiment of the utility model, even if the plastic film cannot completely seal the ground, it can also weaken the oxygen supply. As shown in Figure 3As shown, as the oxidation reaction proceeds, the plastic film further consumes oxygen while wrapping the coal seam more tightly, further weakening the oxygen supply and preventing the spread of spontaneous combustion. Even if it cannot completely block the oxygen supply, it makes the oxygen supply extremely limited, achieving effective control of coal spontaneous combustion. This is because the oxygen required for coal spontaneous combustion is obtained through a large network of cracks, and as long as a part of the crack outlet is closed, the oxygen supply for coal spontaneous combustion can be greatly weakened. In order to further ensure the sealing and oxygen-blocking effect, the plastic film 32 can be provided as a double-layer film, or capsules containing fire extinguishing substances such as fire extinguishing gel can be further provided on the plastic film 32 to further improve the fireproof effect. Alternatively, the plastic film 32 is provided as a double-layer film, and fire extinguishing substances are provided between the two layers of film.

[0032] In the prior art coal mine underground fireproof device, the fire extinguishing purpose is mainly achieved by spraying fire extinguishing substances. Since the spraying is often blind, the consumption is large and the cost is high. In the embodiment of the present application, the fire extinguishing purpose is achieved by blocking the oxygen supply with the help of plastic film covering. Compared with spraying fire extinguishing substances, the plastic film roll can naturally be laid to achieve covering, the covering area is wider, and waste plastic can also be used, and the plastic film can be reused, and the cost is lower. In order to achieve better coverage, the staff can set up multiple plastic film rolls according to the needs to meet the needs of large-area coverage.

[0033] After the plastic film is spread, the oxygen supply for coal spontaneous combustion is greatly weakened, and the coal spontaneous combustion is either completely blocked or the development process is greatly delayed. At this time, the staff on the surface or underground can further process according to the signal feedback of the gas monitoring module, so that the fire monitoring of the goaf and the blind lane is more targeted.

[0034] The embodiment of the present application achieves the blocking of coal spontaneous combustion by covering the ground with plastic film, so it is necessary to discover in the early stage of coal spontaneous combustion, and the sensitivity of gas monitoring is required to be higher, and the embodiment of the present application also hopes to improve the timeliness of coal mine underground fire prevention. Since the underground environment has a high dust content, the appearance of dust often seriously affects the sensitivity and service life of the gas sensor, therefore, the present application also improves the problem of high dust content.

[0035] As shown in FIG. 6, the gas monitoring module 30 is provided with a dust removal device 31. The dust removal device 31 is provided with a dust removal fan 311 and a dust removal filter 312. The dust removal fan 311 is arranged on the side of the dust removal filter 312, and the dust removal filter 312 is arranged on the side of the gas sensor 301. The dust removal fan 311 is arranged to suck the dust in the air and pass it through the dust removal filter 312, so that the dust in the air is removed and the dust content is reduced. Figure 4As shown, the air inlet 22 of the air inlet pipe 23 is provided with an air inlet cover 231 in the shape of a cone. The purpose of providing the air inlet cover 231 is to allow some dust to adhere to the inner surface of the air inlet cover 231 when the external air enters, thereby reducing some of the dust. In order to increase the adhesion surface area of the air inlet cover, protrusions 2311 can be provided on the inner surface of the air inlet cover 231. As the dust accumulated or adhered to the inner surface of the air inlet cover 231 gradually increases, some of the dust that has coagulated into lumps will fall off due to gravity. Further, the air inlet cover 231 is made of elastic material. Since the air inlet cover 231 is made of elastic material, when the external air enters, the air inlet cover 231 will vibrate due to the vibration of the airflow, thereby facilitating the shaking off of some of the dust accumulated on the inner surface, achieving a certain degree of self-cleaning. In the embodiment, the air inlet 22 is provided at the bottom of the gas detection module 2, which is also for the purpose of reducing dust accumulation by gravity.

[0036] Further, as shown in Figure 4 , Figure 5 and Figure 6 , a filter cartridge net 232 is provided at the air inlet 22, which includes an air inlet filter net 2321 and a filter cartridge 2322 extending from the air inlet filter net 2321. The filter cartridge 2322 is provided with air outlet holes 23211. The air inlet filter net 2321 is embedded in the air inlet 22, and the filter cartridge 2322 extends in the air inlet pipe 22. The air passing through the air inlet cover 231 is further filtered by the air inlet filter net 2321, so that the dust is further filtered, and then passes through the filter cartridge 2322 through the air outlet holes 23211 into the air inlet pipe 23. When passing through the filter cartridge 2322, some of the remaining dust is adhered to the filter cartridge 2322.

[0037] Further, as shown in Figure 5 , the air outlet holes 23211 are provided on the side of the filter cartridge 2322, while the top of the filter cartridge 2322 is not open. In the airflow, the driving force of the dust movement is mainly derived from the airflow. When the airflow enters the filter cartridge 2322, since the air outlet holes 23211 are provided on the side and the top is not open, the top becomes a dead angle of the airflow, where the airflow speed is the slowest, and the solid particles with the original speed hit the top of the filter cartridge 2322 due to inertia, so that some of the dust is adhered to the top of the filter cartridge 2322, further filtering the dust. Further, downstream of the filter cartridge net 232, an internal filter net 233 is provided in the air inlet pipe 23 to further filter the dust.

[0038] Further, as shown in Figure 5As shown, the elbow filter screen 234 is arranged at the elbow of the air inlet pipe 23, and the fan 24 is arranged downstream of the elbow. When the airflow passes through the elbow, the remaining dust will adhere to the elbow filter screen 234 due to inertia, or even pass through the elbow filter screen 234 to reach the back of the elbow filter screen 234. After that, the airflow purified by multiple times passes through the fan 24 to reach the sensing chamber 25. After multiple purifications, the corrosion of the dust to the fan is also minimized. Because multiple filters are arranged, and the air inlet cover made of elastic material can also achieve a certain degree of self-purification, so that the maintenance period of the gas monitoring module 2 is greatly extended, which is beneficial for the monitoring of the goaf and blind lane with a large amount of monitoring tasks.

[0039] The coal mine underground fireproof device provided by the utility model reduces the influence of underground dust on the gas sensor, improves the timeliness of fire warning, lays plastic film in time, reduces oxygen supply, slows down or even blocks the development of coal spontaneous combustion, and improves the effectiveness of fire prevention and control.

[0040] In the description of the utility model, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" orientation or positional relationship are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model.

[0041] The utility model has been described by the above related embodiments, however, the above embodiments are only examples for implementing the utility model. It must be pointed out that the disclosed embodiments do not limit the scope of the utility model. On the contrary, changes and modifications made without departing from the spirit and scope of the utility model are all within the scope of patent protection of the utility model.

Claims

1. A fire protection device for use in a coal mine, characterised in that, The utility model relates to a fireproofing and gas monitoring system, comprising: a controller; a gas monitoring module, a sensing chamber is arranged in the gas monitoring module, a gas sensor is arranged in the sensing chamber, an air inlet pipe is arranged on the gas monitoring module, a fan is arranged on the air inlet pipe, and the air inlet pipe leads to the sensing chamber; a fireproofing module, the fireproofing module is arranged on a wall surface, a plastic film roll is arranged in the fireproofing module, one end of the plastic film roll is fixed to an inner wall of the fireproofing module, one end of a bottom plate of the fireproofing module is hingedly connected to a side plate close to the wall surface, the other end of the bottom plate is provided with an iron sheet and is attached to an upper side plate through an electromagnet; wherein, when the gas monitoring module senses that the concentration of a certain gas or certain gases exceeds the standard, the controller deenergizes the electromagnet, the bottom plate is opened, the plastic film roll is rolled down and spread out.

2. A coal mine fire prevention device according to claim 1, characterised in that, A gas inlet cover is arranged at the air inlet of the air inlet pipe, and the gas inlet cover is conical.

3. A coal mine fire prevention device according to claim 2, characterised in that, A protrusion is arranged on the inner surface of the gas inlet cover.

4. A coal mine fire prevention device according to claim 2 or 3, characterised in that, The gas inlet cover is made of an elastic material.

5. The coal mine fire prevention device according to claim 3, wherein, A filter cartridge screen is arranged at the air inlet, the filter cartridge screen comprises an air inlet filter screen and a filter cartridge extending from the air inlet filter screen, air outlet holes are arranged on the filter cartridge, the air inlet filter screen is embedded in the air inlet, and the filter cartridge extends in the air inlet pipe.

6. A coal mine fire prevention device according to claim 5, characterised in that, The air outlet holes are arranged on the side of the filter cartridge.

7. A coal mine fire prevention device according to claim 6, characterised in that, An internal filter screen is arranged downstream of the filter cartridge screen in the air inlet pipe.

8. A coal mine fire prevention device according to claim 7, characterised in that, A bend filter screen is arranged at the bend of the air inlet pipe, and the fan is arranged downstream of the bend.

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