Safety device for preventing spontaneous combustion and ignition

Abstract

The utility model relates to the technical field of coal mine goaf fire prevention, and discloses a spontaneous combustion prevention safety device which comprises a box body. The air supply assembly comprises a water storage cavity, an air storage cavity, an air inlet pipe, a DN40 air constant pressure valve, a contact switch valve, an air inlet control valve, an exhaust control valve, an air conveying pipeline, a limiting ring, a sealing sleeve, an ejector rod and a floating ball. By arranging the gas supply assembly, when the goaf of the coal mine is subjected to drainage operation, the goaf of the coal mine is in a negative pressure state, and at the moment, the gas inlet control valve, the DN40 air constant pressure valve and the gas exhaust control valve are started, so that the gas inlet pipe continuously inputs inert gas into the gas storage cavity and the gas conveying pipeline, and the inert gas is promoted to be filled into the goaf of the coal mine; passive entry of air into the goaf is changed into automatic entry of inert gas into the goaf through the device, passive prevention of goaf ignition is changed into beforehand prevention, and the overall fireproof safety of the coal mine goaf is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire prevention in coal mine goafs, in particular to a safety device for preventing spontaneous combustion. Background Art

[0002] The goaf is the abandoned space after coal mining. The collapse and cracks caused by mining subsidence in this space are often the channels for rain or river water to enter the mine, which can easily cause water accumulation in the goaf. The goaf becomes a relatively closed space with a relatively low risk of spontaneous combustion. With the changes in the production continuity of the mine, it is sometimes necessary to drain the water in the goaf. During the drainage process of the water in the goaf, as the water is discharged, a large amount of air will inevitably re-enter the goaf from the drainage holes or cracks in the surrounding rocks. During the drainage process, the risk of spontaneous combustion in the goaf increases. It is possible that the leakage of air from the drainage holes will cause the coal left in the goaf of the working face to spontaneously ignite, and cause a gas explosion.

[0003] In the prior art, fire prevention measures for coal mine goafs usually include assessing the risk of spontaneous combustion in the goafs before draining water from the goafs; monitoring and controlling the risk of spontaneous combustion in the goafs when draining water from the goafs, and formulating special measures to prevent spontaneous combustion in the goafs; and closing the drain valve in a timely manner after draining water from the goafs to ensure that there is no air leakage through the drain pipe.

[0004] However, in the actual operation process, as the water is drained, cavities will appear in the goaf at the same time, and the supplementary air comes from the tunnels connected to the surrounding cracks and even the surface. If the air cannot be replenished, a negative pressure vacuum will appear in the goaf, making it impossible to release the water. Therefore, air will inevitably enter the goaf when draining water. Even if the drain valve is closed after the water is drained, it only prevents air from entering the goaf through the drain hole. However, the air that has entered and filled the goaf already exists. The goaf filled with air may spontaneously combust with the coal residue. In view of this, we propose a safety device to prevent spontaneous combustion. Utility Model Content

[0005] The purpose of the utility model is to provide a safety device for preventing spontaneous combustion, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a safety device for preventing spontaneous combustion, comprising a box body, wherein an air supply component is arranged inside the box body, and the air supply component comprises:

[0007] A water storage cavity, wherein a water storage cavity and an air storage cavity are provided inside the box body, and an air inlet pipe is fixedly connected to the top outer wall of the box body;

[0008] DN40 air constant pressure valve, the end of the air inlet pipe is fixedly connected with the air outlet of the DN40 air constant pressure valve, the air inlet of the DN40 air constant pressure valve is fixedly connected with the contact switch valve through another air inlet pipe, and the air inlet end of the contact switch valve is fixedly connected with the air inlet control valve through another set of air inlet pipes;

[0009] An exhaust control valve, wherein the side wall of the box is fixedly mounted with an exhaust control valve through a pipeline, and the outlet end of the exhaust control valve is fixedly connected to a gas pipeline;

[0010] A limiting ring is fixedly installed on the inner wall of the air storage cavity, a sealing sleeve is fixedly installed on the top inner wall of the air storage cavity, a push rod is penetrated through the inner wall of the sealing sleeve and slidably connected, and a floating ball is fixedly installed on the bottom end of the push rod.

[0011] Preferably, the top plane of the water storage chamber is higher than the bottom plane of the air storage chamber, so that after the water storage chamber is filled with liquid water, when the inner wall of the air storage chamber is filled with inert gas through the air inlet pipe, the liquid water can seal the bottom position of the air storage chamber.

[0012] Preferably, a contact switch is provided at the bottom of the contact switch valve, and the contact switch and the push rod are arranged in the same plane, so that when the push rod moves upward, the contact switch can be squeezed and resisted, thereby realizing the opening or closing of the contact switch valve.

[0013] Preferably, a transmission cavity is opened in the inner wall of the top end of the push rod, a contact rod is penetrated through the inner wall of the transmission cavity and slidably installed, a spring is fixedly connected between the bottom end of the contact rod and the bottom end surface of the transmission cavity, a deceleration rod is fixedly installed on the bottom surface of the transmission cavity, a guide groove is opened on the side wall of the deceleration rod, a protrusion is provided on the inner surface of the guide groove, and a contact slider is slidably installed on the inner wall of the contact rod.

[0014] Preferably, the inner wall of the contact rod is provided with a sliding cavity adapted to the size of the deceleration rod, and the inner wall of the sliding cavity is provided with a limiting sliding groove for allowing the contact slider to slide horizontally, and the end of the contact slider is arranged on the inner wall of the guide groove.

[0015] Preferably, the end of the contact slider is configured to be arc-shaped to avoid being stuck between the end of the contact slider and the guide groove.

[0016] Compared with the prior art, the utility model provides a safety device for preventing spontaneous combustion, which has the following beneficial effects:

[0017] 1. The anti-spontaneous combustion safety device is provided with an air supply component. When the goaf of the coal mine is drained, the goaf is in a negative pressure state. At this time, the air intake control valve, the DN40 air constant pressure valve and the exhaust control valve are started, so that the air intake pipe continuously inputs inert gas into the air storage chamber and the gas transmission pipeline, thereby prompting the inert gas to fill the goaf of the coal mine, and the passive entry of air into the goaf is changed to the automatic entry of inert gas into the goaf through the device, and the fire prevention of the goaf is changed from passive to pre-emptive prevention, thereby improving the overall fire safety of the goaf of the coal mine.

[0018] 2. The anti-spontaneous combustion safety device has a transmission cavity opened on the top inner wall of the top rod pair, which cooperates with the contact slider and the guide groove arranged in the contact rod. Under the influence of the protrusion, the deceleration rod is subject to less blocking force when moving upward relative to the contact rod, but is subject to greater resistance when moving downward relative to the contact rod. Therefore, when the top rod moves downward, the contact rod can maintain an upward lifting effect for a longer time under the influence of the elastic force of the spring, so that the pressure difference between the goaf and the inert gas delays the time of closing the contact switch valve at the critical point of equilibrium, thereby extending the filling time of the inert gas and avoiding the backflow caused by insufficient inert gas filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the partial three-dimensional structure of the gas replenishing component of the utility model;

[0022] Figure 4 This is a schematic diagram of the top rod structure in the second embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of the ejector rod in the second embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the deceleration rod in the second embodiment of the utility model;

[0025] Figure 7 For this utility model Figure 6 Schematic diagram of the enlarged structure of area A in the middle.

[0026] In the figure: 1. box body; 2. water storage chamber; 3. air storage chamber; 4. air intake pipe; 5. air intake control valve; 6. contact switch valve; 7. DN40 air constant pressure valve; 8. exhaust control valve; 9. air transmission pipeline; 10. restriction ring; 11. sealing sleeve; 12. push rod; 13. float; 14. contact rod; 15. spring; 16. deceleration rod; 17. guide groove; 18. bump; 19. contact slider. DETAILED DESCRIPTION

[0027] Embodiment 1

[0028] like Figure 1-Figure 3 As shown, the utility model provides a technical solution: a safety device for preventing spontaneous combustion, comprising a box body 1, wherein an air supply component is arranged inside the box body 1, and the air supply component comprises a water storage chamber 2, an air storage chamber 3, an air intake pipe 4, a DN40 air constant pressure valve 7, a contact switch valve 6, an air intake control valve 5, an exhaust control valve 8, an air transmission pipeline 9, a limiting ring 10, a sealing sleeve 11, a push rod 12 and a float 13.

[0029] In one embodiment of the utility model, a water storage chamber 2 and an air storage chamber 3 are provided inside the box body 1, an air inlet pipe 4 is fixedly connected to the top outer wall of the box body 1, and the end of the air inlet pipe 4 is fixedly connected to the air outlet of a DN40 air constant pressure valve 7, the air inlet of the DN40 air constant pressure valve 7 is fixedly connected to the contact switch valve 6 through another air inlet pipe 4, the air inlet end of the contact switch valve 6 is fixedly connected to the air inlet control valve 5 through another group of air inlet pipes 4, the air inlet end of the air inlet control valve 5 is connected to the external gas storage equipment through a pipeline, an exhaust control valve 8 is fixedly installed on the side wall of the box body 1 through a pipeline, the air outlet end of the exhaust control valve 8 is fixedly connected to a gas pipeline 9, a limiting ring 10 is fixedly installed on the inner wall of the air storage chamber 3, a sealing sleeve 11 is fixedly installed on the top inner wall of the air storage chamber 3, a push rod 12 is penetrated and slidably connected to the inner wall of the sealing sleeve 11, and a float 13 is fixedly installed on the bottom end of the push rod 12.

[0030] Furthermore, the interior of the water storage chamber 2 is filled with liquid water, and the top plane of the water storage chamber 2 is higher than the bottom plane of the air storage chamber 3. Therefore, after the water storage chamber 2 is filled with liquid water, when the inner wall of the air storage chamber 3 is filled with inert gas through the air inlet pipe 4, the liquid water can seal the bottom position of the air storage chamber 3 to avoid gas leakage in the air storage chamber 3, and at the same time, it can also pass through the space higher than the bottom plane of the air storage chamber 3 to better achieve the air pressure balance in the air storage chamber 3. In addition, a drain port is provided on the outer wall of the left end of the water storage chamber 2 to discharge excess liquid water from the water storage chamber 2, and a slag removal port is provided on the outer wall of the right end of the water storage chamber 2 to remove impurities in the internal space of the box body 1 after long-term use, so as to facilitate the normal use of the equipment. Specifically, a contact switch is provided at the bottom of the contact switch valve 6, and the contact switch and the push rod 12 are provided in the same plane, so that when the push rod 12 moves upward, the contact switch can be squeezed and resisted, thereby realizing the opening or closing of the contact switch valve 6.

[0031] In addition, the end of the gas pipeline 9 is connected to the goaf area of ​​the coal mine. When the gas replenishment work is carried out in the goaf area of ​​the coal mine, the DN40 air constant pressure valve 7 is opened, so that when the inert gas filled into the gas storage chamber 3 passes through the DN40 air constant pressure valve 7, the DN40 air constant pressure valve 7 automatically adjusts the inert gas pressure to be the same as the water pressure in the goaf, so as to better achieve the gas replenishment work. At the same time, the push rod 12 is arranged inside the restriction ring 10. Through the restriction and guidance of the restriction ring 10, the push rod 12 will fill the water storage chamber 2 under the influence of the float 13. It moves upward in the liquid water until the top of the push rod 12 contacts the bottom contact switch of the contact switch valve 6 to control the inert gas pressure in the gas storage chamber 3 to drop. The liquid level in the water storage chamber 2 changes, thereby controlling the switch of the contact switch valve 6 by the push rod 12, so as to replenish the inert gas in the gas storage chamber 3, collect the water in the goaf and exchange the inert gas with the accumulated water in the goaf after pressure regulation, so that the space in the goaf of the coal mine is filled with inert gas to avoid spontaneous combustion and affect the mining safety of the coal mine.

[0032] Embodiment 2

[0033] like Figure 4-Figure 7 As shown, on the basis of embodiment 1, a transmission cavity is opened in the inner wall of the top end of the push rod 12, and a contact rod 14 is penetrated through the inner wall of the transmission cavity and slidably installed, a spring 15 is fixedly connected between the bottom end of the contact rod 14 and the bottom end surface of the transmission cavity, a deceleration rod 16 is fixedly installed on the bottom surface of the transmission cavity, a guide groove 17 is opened on the side wall of the deceleration rod 16, a protrusion 18 is provided on the inner surface of the guide groove 17, and a contact slider 19 is slidably installed on the inner wall of the contact rod 14.

[0034] In the embodiment of the utility model, a disc is provided at the top of the contact rod 14 so that the contact rod 14 can touch the contact switch provided at the bottom of the contact switch valve 6. At the same time, the spring 15 is sleeved on the outer wall of the deceleration rod 16, so that the spring 15 can only be deformed in the vertical direction without deflection in the horizontal direction, thereby ensuring the stable transmission effect of the spring 15 on the contact rod 14. In addition, a sliding cavity matching the size of the deceleration rod 16 is provided on the inner wall of the contact rod 14, and a limiting sliding groove is provided on the inner wall of the sliding cavity for the contact slider 19 to slide in the horizontal direction. Specifically, the end of the contact slider 19 is provided on the inner wall of the guide groove 17, and the end of the contact slider 19 is provided It is arc-shaped to avoid getting stuck with the guide groove 17. Therefore, when relative displacement occurs between the contact rod 14 and the deceleration rod 16, the contact slider 19 moves inside the guide groove 17 and is affected by the protrusion 18, so that the deceleration rod 16 is subject to less blocking force when moving upward relative to the contact rod 14, but is subject to greater resistance when moving downward relatively. Therefore, when the top rod 12 moves downward, the contact rod 14 can maintain the upward lifting effect for a longer time under the influence of the elastic force of the spring 15, so that the pressure difference between the goaf and the inert gas delays the time of closing the contact switch valve 6 at the equilibrium critical point, thereby extending the filling time of the inert gas and avoiding the backflow caused by insufficient inert gas filling.

[0035] In the utility model, when in use, the relative position of the water storage chamber 2 and the air storage chamber 3 is set so that the liquid water filled in the water storage chamber 2 can seal the inert gas filled in the air storage chamber 3 to avoid leakage of the inert gas. When the water is drained in the goaf of the coal mine, air passively enters the goaf. During this process, the goaf of the coal mine is in a negative pressure state. At this time, the air intake control valve 5, the DN40 air constant pressure valve 7 and the exhaust control valve 8 are started, so that the air intake pipe 4 continuously inputs inert gas into the air storage chamber 3 and the gas pipeline 9, thereby prompting the inert gas to be filled into the goaf of the coal mine, and the passive entry of air into the goaf is changed to the automatic entry of inert gas into the goaf through the device. The fire prevention of the goaf is changed from passive to pre-emptive prevention, thereby improving the overall fire safety of the goaf of the coal mine. The gas pressure is controlled to match the water pressure through the DN40 air constant pressure valve 7, and the contact switch valve 6 automatically replenishes the inert gas according to the water level in the water storage chamber 2 to achieve the effect of automatic inert injection.

[0036] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A safety device for preventing spontaneous combustion, comprising a housing (1), characterized in that: An air supply component is arranged inside the box (1), and the air supply component comprises: A water storage chamber (2), wherein the box body (1) is provided with a water storage chamber (2) and an air storage chamber (3), and an air inlet pipe (4) is fixedly connected to the top outer wall of the box body (1); A DN40 air constant pressure valve (7), wherein the end of the air inlet pipe (4) is fixedly connected with the air outlet of the DN40 air constant pressure valve (7), the air inlet of the DN40 air constant pressure valve (7) is fixedly connected to the contact switch valve (6) via another air inlet pipe (4), and the air inlet end of the contact switch valve (6) is fixedly connected to the air inlet control valve (5) via another set of air inlet pipes (4); An exhaust control valve (8), wherein the exhaust control valve (8) is fixedly mounted on the side wall of the box body (1) via a pipeline, and the outlet end of the exhaust control valve (8) is fixedly connected to a gas delivery pipeline (9); A limiting ring (10) is fixedly mounted on the inner wall of the air storage chamber (3), a sealing sleeve (11) is fixedly mounted on the top inner wall of the air storage chamber (3), a push rod (12) is penetrated through the inner wall of the sealing sleeve (11) and is slidably connected, and a floating ball (13) is fixedly mounted on the bottom end of the push rod (12).

2. A self-ignition prevention safety device according to claim 1, characterized in that: The top plane of the water storage chamber (2) is higher than the bottom plane of the air storage chamber (3).

3. The anti-spontaneous combustion safety device according to claim 1, characterized in that: A contact switch is arranged at the bottom of the contact switch valve (6), and the contact switch and the push rod (12) are arranged in the same plane.

4. The anti-spontaneous combustion safety device according to claim 1, characterized in that: A transmission cavity is provided in the inner wall of the top end of the push rod (12), a contact rod (14) is penetrated through the inner wall of the transmission cavity and slidably mounted thereon, a spring (15) is fixedly connected between the bottom end of the contact rod (14) and the bottom end surface of the transmission cavity, a deceleration rod (16) is fixedly mounted on the bottom surface of the transmission cavity, a guide groove (17) is provided on the side wall of the deceleration rod (16), a protrusion (18) is provided on the inner surface of the guide groove (17), and a contact slider (19) is slidably mounted on the inner wall of the contact rod (14).

5. The anti-spontaneous combustion safety device according to claim 4, characterized in that: The inner wall of the contact rod (14) is provided with a sliding cavity that matches the size of the deceleration rod (16), and the inner wall of the sliding cavity is provided with a limiting sliding groove that allows the contact slider (19) to slide in the horizontal direction, and the end of the contact slider (19) is arranged on the inner wall of the guide groove (17).

6. The anti-spontaneous combustion safety device according to claim 4, characterized in that: The end of the contact slider (19) is arranged in an arc shape.

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