Multi-level explosion-proof device and extraction method

Abstract

The multi-level explosion-proof device comprises a sealing mechanism, a main extraction channel and an auxiliary extraction channel, one end of the sealing mechanism is plugged in a to-be-extracted hole channel to form a plugging section, and the sealing mechanism penetrates through a machining hole; the input end of the main extraction channel is communicated with the machining hole of the plugging section, a first separation surface is arranged at the communication part, the main extraction channel is configured to extract gas to be extracted in the machining hole of the plugging section, and the auxiliary extraction channel is configured to extract gas to be extracted in the machining hole of the non-plugging section; the device further comprises an anti-explosion mechanism and a slave extraction channel, the machining hole, the anti-explosion mechanism and the slave extraction channel are sequentially communicated, a second separation face is arranged in the anti-explosion mechanism, the first separation face and the second separation face are configured to separate gas to be extracted, the anti-explosion mechanism is configured to decompress the gas to be extracted, and the slave extraction channel is configured to extract the gas to be extracted. The method has the beneficial effects that the problem of air leakage is accurately and effectively solved in combination with the actual working condition.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to a multi-level explosion-proof device and a coal mining method. Background Art

[0002] In the coal mine production process, high-gas coal seams must be pre-extracted. Before the extraction work begins, extraction holes need to be drilled into the coal seams. However, during this process, phenomena such as blowholes may occur, causing abnormal gas outflows and even safety accidents such as gas outbursts.

[0003] To solve this problem, a common method underground is to install a three-way blowout prevention device d at the borehole mouth. The blowout prevention device mainly consists of a gas extraction channel a, a waste channel b and a drill channel c. Figure 5 shown.

[0004] Due to the continuous movement of the drill pipe in the existing three-way blowout preventer, there will be gaps between the drill pipe and the three-way blowout preventer d, as well as between the blowout preventer and the gas extraction channel a. Gas will continuously flow out into the tunnel through the gaps. Once a large-scale blowout event occurs, the internal space of the tee is limited, and a large amount of gas will flow into the tunnel, threatening the lives of underground workers.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art known to a person skilled in the art. Summary of the invention

[0006] The technical problem to be solved by the present invention is: how to solve the gas leakage problem during extraction drilling under different working conditions.

[0007] The present invention solves the above technical problems through the following technical means:

[0008] The present invention claims a multi-level explosion-proof device, including a sealing mechanism, a main extraction channel and an auxiliary extraction channel, one end of the sealing mechanism is sealed in the hole to be extracted to form a blocking section, and the sealing mechanism runs through the processing hole;

[0009] The input end of the main extraction channel is connected to the processing hole of the plugging section, and a first separation surface is provided at the connecting portion, wherein the main extraction channel is configured to extract the gas to be extracted from the processing hole of the plugging section, and the auxiliary extraction channel is configured to extract the gas to be extracted from the processing hole of the non-plugging section;

[0010] It also includes an explosion-proof mechanism and a secondary extraction channel, wherein the processing hole, the explosion-proof mechanism and the secondary extraction channel are connected in sequence, and a second separation surface is arranged in the explosion-proof mechanism, wherein the first separation surface and the second separation surface are configured to separate the gas to be extracted, the explosion-proof mechanism is configured to decompress the gas to be extracted, and the secondary extraction channel is configured to extract the gas to be extracted.

[0011] Preferably, the sealing mechanism includes a sealing component and a multi-pass component. The sealing component is arranged inside the extraction hole in a sealed manner, and the sealing component forms a plugging section.

[0012] The multi-pass component is arranged outside the sealing component in a sealed manner. A cavity is arranged inside the sealing component, and a processing pipeline is arranged inside the cavity. A first separation surface is arranged on the surface of the processing pipeline through which the gas to be extracted flows. The multi-pass component penetrates through a first through hole, and the first through hole is aligned with the processing pipeline to form a processing hole.

[0013] Preferably, a third through hole is opened at the end surface of the multi-pass component close to the sealing component. A main gap is formed between the first separation surface a and the cavity. One end of the main gap is communicated with the third through hole, the other end of the third through hole faces upward, and the third through hole and the main gap form the input end of the main pumping channel.

[0014] Preferably, a first debris channel is arranged at the bottom of the multi-pass component. The input end of the first debris channel is communicated with the first through hole. A fourth through hole is opened at the top of the multi-pass component, and the fourth through hole is communicated with the second through hole. The fourth through hole forms the input end of the auxiliary pumping channel.

[0015] Preferably, a second through hole is opened at the bottom of the multi-pass component. One end of the second through hole is communicated with the second through hole, and the other end of the second through hole is communicated with the second debris channel. A second baffle is arranged inside the second through hole. Among them, the second baffle is configured to control the opening and closing of the second debris channel, and the second through hole forms the input end of the second debris channel.

[0016] Preferably, the explosion-proof mechanism includes a drainage sleeve, a pressure-reducing hose and a drainage channel. A fourth through hole is opened at the bottom side of the multi-pass component. The processing hole and the fourth through hole are communicated with each other. One end of the fourth through hole is communicated with the drainage sleeve. The drainage sleeve is arranged in a downward inclined manner away from the multi-pass component, and the other end of the drainage sleeve is connected with the pressure-reducing hose;

[0017] A drainage channel inlet is arranged at the nozzle of the pressure-reducing hose connected to the drainage sleeve. The outlet of the drainage channel faces downward. Among them, the surface of the drainage channel through which the gas to be extracted flows forms a second separation surface.

[0018] Preferably, the outlet of the drainage channel is communicated with the first debris channel, and a first baffle is arranged at the outlet of the drainage channel. Among them, the first baffle is configured to control the opening and closing of the first debris channel.

[0019] Preferably, the sealing component includes an outer barrel, an inner barrel and a stabilizing unit. The outer barrel is sealed and clamped inside the extraction hole through the stabilizing unit. The inner barrel and the processing pipeline are arranged coaxially in sequence inside the outer barrel. Among them, the gap formed between the outer barrel and the inner barrel forms a grouting gap, and the gap between the inner barrel and the processing pipeline forms a main gap; One end of the grouting gap is communicated with the grouting pipeline, and the grouting pipeline and the multi-pass component are arranged at staggered positions with each other.

[0020] Preferably, a stabilizing unit is installed on the outer barrel wall. The stabilizing unit has a fan-shaped cross-section configuration, and the central angle of the fan points outside the hole to be mined.

[0021] A clamping groove is correspondingly arranged in the hole to be mined. When the end of the outer barrel abuts tightly against the bottom of the hole to be mined, the stabilizing unit and the clamping groove form a sealed clamping fit.

[0022] The present invention also claims to protect a multi-level explosion-proof extraction method, which applies any one of the multi-level explosion-proof devices described in the claims, including:

[0023] Based on the alignment of the processing holes, one end of the sealing mechanism is blocked to the hole to be mined to form a blocked section, and the processing rod passes through the processing hole.

[0024] Judge whether the hole to be mined is in the state of jetting holes. If not, start the processing rod. The main extraction channel extracts the gas to be mined in the processing holes of the blocked section, and the auxiliary extraction channel extracts the gas to be mined in the processing holes of the unblocked section.

[0025] If so, turn off the processing rod, and the explosion-proof mechanism decompresses the gas to be mined, and the extraction channel extracts the gas to be mined.

[0026] The advantages of the present invention are as follows:

[0027] First, the present invention claims to protect a multi-level explosion-proof device, including a sealing mechanism. By blocking the hole to be mined through the sealing mechanism, during the extraction process, the gas to be mined will not flow out of any gap in the hole to be mined into the roadway, playing a preliminary role in guiding the flow direction of the gas to be mined, so that the gas to be mined can only flow through the processing holes. Then, in cooperation with the main extraction channel, a first separation surface is arranged between the main extraction channel and the processing holes. The first separation surface is used to separate the jetting fluid generated during processing, mainly separating debris and the gas to be mined. Therefore, most of the gas to be mined in the processing holes will enter the main extraction channel. On this basis, in cooperation with the auxiliary extraction channel, the auxiliary extraction channel is used to extract the gas to be mined in the processing holes of the unblocked section. The comprehensive extraction and removal of the gas to be mined in the processing holes are realized. The multi-level explosion-proof device also includes an explosion-proof mechanism, mainly in the case where the hole to be mined is in the state of jetting holes, decompressing the gas to be mined. When jetting holes, a large amount of jetting fluid causes blockage in the processing holes. At this time, the second separation surface separates solids, and the explosion-proof mechanism expands rapidly under the action of the gas to be mined to carry out decompression. After decompression is completed, the extraction channel extracts the gas to be mined.

[0028] Second, the sealing mechanism mainly realizes the plugging of the to-be-mined hole through the sealing component, and then cooperates with the through hole of the multi-pass component to realize the drainage of the to-be-mined gas. Specifically, a processing pipeline is arranged inside the sealing component, and the processing pipeline is aligned with the first through hole to form a processing hole. The above settings have three advantages. Advantage one: The sizes of the processing pipeline and the processing rod inserted into the processing hole are matched, reducing the generation of gaps and the large outflow of the to-be-mined gas. Advantage two: No debris will remain at the connection part between the processing pipeline and the first through hole. Advantage three: The processing pipeline can separate the to-be-mined gas from the debris, so that most of the to-be-mined gas enters the main gap and then flows into the main extraction channel.

[0029] Third, the fourth through hole is located at the top of the second through hole. Due to the density of the to-be-mined gas itself, the debris enters the auxiliary extraction channel before entering the first debris channel, so as to quickly and accurately extract the to-be-mined gas in the debris.

[0030] Fourth, the explosion-proof mechanism mainly leads the orifice fluid blocked in the processing hole to the decompression hose, and then cooperates with the drainage channel to separate the solid and the to-be-mined gas in the orifice fluid. As the to-be-mined gas continuously increases, the decompression hose deforms and expands to carry out decompression, and the to-be-mined gas is extracted by the extraction channel.

[0031] Fifth, the sealing component mainly realizes the sealing and clamping of the outer barrel and the to-be-mined hole through the stable unit arranged on the outer barrel, so as to block the to-be-mined hole by the sealing component. Then, an inner barrel and a stable unit are set. In actual operation, the sealing component is stabilized and the seal between the end face of the sealing component and the to-be-mined hole is realized by pouring mortar into the grouting gap. The to-be-mined gas flows from the main gap into the main extraction channel.

[0032] Sixth, the stable unit has a fan-shaped cross-section configuration, and the center angle of the fan points outside the to-be-mined hole. When the outer barrel is inserted into the to-be-mined hole, it not only does not affect the insertion, but also because the stable unit is engaged with the card slot, the contact surfaces are staggered with each other, effectively preventing the to-be-mined gas from flowing out.

[0033] Seventh, the drainage sleeve is set to be inclined downward, so that the orifice fluid can enter the decompression hose under the negative pressure state generated by the extraction from the extraction channel and the gravity of the orifice fluid itself, avoiding the accumulation and blockage of the orifice fluid.

[0034] VIII. The present invention also claims to protect a multi-level explosion-proof extraction method. By sealing the sealing mechanism in the hole to be mined, when the processing rod processes the hole to be mined, first, the gas to be mined generated is blocked to prevent the gas from flowing out of the gap between the hole to be mined and the sealing mechanism into the roadway, reducing the safety impact. In actual work, it is divided into two states. State 1: The hole to be mined is in normal working condition. At this time, the processing rod performs processing operations. Not only does the main extraction channel extract the gas to be mined in the processing holes of the blocked section, but also the auxiliary extraction channel extracts the gas to be mined in the processing holes of the unblocked section, so as to comprehensively extract the gas to be mined generated during processing and prevent the gas to be mined from flowing out of the roadway. State 2: The hole to be mined is in the state of outburst. Since the hole to be mined is blocked by the sealing mechanism, at this time, a large amount of outburst fluid, that is, a mixture of gas and solid, directly surges into the processing holes. This will not only directly block the processing holes, resulting in inability to process, but also a large amount of gas, that is, the gas to be mined, will flow out of the processing holes and the debris channels into the roadway, causing danger. At this time, the explosion-proof mechanism is configured to decompress the gas to be mined and extract the gas to be mined from the extraction channel. This extraction method combines the actual working conditions, divides the working conditions of the hole to be mined into different typical situations, and operates and processes based on different situations, with high applicability and accurately and effectively solving the problem of air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of the assembly of a multi-level explosion-proof device and a hole to be mined in Embodiment 1 of the present invention;

[0036] Figure 2 is a side view of the structure of a multi-level explosion-proof device in Embodiment 1 of the present invention;

[0037] Figure 3 is a side view of a multi-pass component in Embodiment 1 of the present invention;

[0038] Figure 4 is a schematic diagram of a multi-level explosion-proof extraction method in Embodiment 2 of the present invention;

[0039] Figure 5 is a schematic diagram of a prior art three-way anti-blowout device.

[0040] a, gas extraction channel; b, waste channel; c, drilling channel; d, three-way anti-blowout device;

[0041] 1, sealing mechanism; 10, sealing component; 100, processing pipeline; 101, outer barrel; 102, inner barrel; 103, stabilizing unit; 11, multi-pass component; 110, first through hole; 111, second through hole; 112, third through hole; 113, fourth through hole;

[0042] 4, explosion-proof mechanism; 41, drainage sleeve; 42, drainage channel; 420, filter screen; 43, decompression hose;

[0043] 6. Secondary extraction channel Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment 1

[0046] Refer to Figures 1 to 3 , the present invention claims to protect a multi-level explosion-proof device, including a sealing mechanism 1, a main extraction channel, a secondary extraction channel, an explosion-proof mechanism 4, and a secondary extraction channel 6.

[0047] Among them, one end of the sealing mechanism 1 is blocked in the hole to be mined to form a blocking section, and the sealing mechanism 1 penetrates the processing hole; the sealing mechanism 1 includes a sealing component 10 and a multi-pass component 11. The sealing component 10 is hermetically arranged in the hole to be mined, and the sealing component 10 forms a blocking section. The sealing component 10 includes an outer barrel 101, an inner barrel 102, and a stabilizing unit 103. The stabilizing unit 103 is arranged on the wall of the outer barrel 101, and the stabilizing unit 103 has a fan-shaped cross-sectional configuration, and the central angle of the fan points outside the hole to be mined; when the outer barrel 101 is inserted into the hole to be mined, it not only does not affect the insertion, but also because the stabilizing unit 103 is engaged with the card slot in a matching manner, the contact surfaces are staggered with each other, effectively preventing the gas to be mined from flowing out. A card slot is correspondingly arranged in the hole to be mined. When the end of the outer barrel 101 is in tight fit with the bottom of the hole to be mined, the stabilizing unit 103 and the card slot form a sealed engagement. An inner barrel 102 and a processing pipeline 100 are coaxially arranged in the outer barrel 101 in sequence. Among them, the gap formed between the outer barrel 101 and the inner barrel 102 constitutes a grouting gap, and the gap between the inner barrel 102 and the processing pipeline 100 constitutes a main gap; one end of the grouting gap is communicated with a grouting pipeline, and the grouting pipeline and the multi-pass component 11 are arranged at staggered positions. In actual operation, the stabilizing of the sealing component 10 and the sealing between the end surface of the sealing component 10 and the hole to be mined are realized by pouring mortar into the grouting gap. The gas to be mined flows into the main extraction channel from the main gap.

[0048] The multi-pass component 11 is hermetically arranged outside the sealing component 10. A cavity is arranged inside the sealing component 10, and a processing pipeline 100 is arranged in the cavity. A first separation surface is arranged on the surface of the processing pipeline 100 through which the gas to be mined flows. The multi-pass component 11 penetrates through the first through hole 110, and the first through hole 110 is aligned with the processing pipeline 100 to form a processing hole.

[0049] In actual work, the sealing mechanism 1 mainly plugs the hole to be mined through the sealing component 10, and then cooperates with the through hole of the multi-way component 11 to realize the drainage of the gas to be mined. Specifically, a processing pipeline 100 is arranged in the sealing component 10, and the processing pipeline 100 is aligned with the first through hole 110 to form a processing hole. The above settings have three advantages. Advantage one: The size of the processing pipeline 100 and the processing rod inserted into the processing hole is matched, reducing the generation of gaps and preventing a large amount of the gas to be mined from flowing out. Advantage two: No debris remains at the connection part of the processing pipeline 100 and the first through hole 110. Advantage three: The processing pipeline 100 can separate the gas to be mined from the debris, so that most of the gas to be mined enters the main gap and then flows into the main pumping channel.

[0050] Among them, the input end of the main pumping channel is connected to the processing hole in the plugging section, and a first separation surface is arranged at the connection part. The main pumping channel is configured to extract the gas to be mined in the processing hole of the plugging section. A third through hole 112 is opened on the end surface of the multi-way component 11 close to the sealing component 10. A main gap is formed between the first separation surface a and the cavity. The main gap is connected to one end of the third through hole 112, and the other end of the third through hole 112 faces upward. The third through hole 112 and the main gap form the input end of the main pumping channel.

[0051] The auxiliary pumping channel is configured to extract the gas to be mined in the processing hole of the non-plugging section. A second through hole 111 is opened at the bottom of the multi-way component 11. One end of the second through hole 111 is connected to the second through hole 111, and the other end of the second through hole 111 is connected to the second debris channel. The first debris channel is connected to the first through hole 110. A fourth through hole 113 is opened at the top of the multi-way component 11. The fourth through hole 113 is connected to the second through hole 111. The fourth through hole 113 forms the input end of the auxiliary pumping channel. A second baffle is arranged in the second through hole 111. The second baffle is configured to control the opening and closing of the second debris channel. The fourth through hole 113 is located at the top of the second through hole 111. Due to the action of the self-density of the gas to be mined, the debris enters the auxiliary pumping channel before entering the first debris channel, so as to quickly and accurately extract the gas to be mined in the debris.

[0052] Among them, the processing hole, the explosion-proof mechanism 4 and the secondary pumping channel 6 are connected in sequence. The explosion-proof mechanism 4 is configured to decompress the gas to be mined. The explosion-proof mechanism 4 includes a drainage sleeve 41, a decompression hose 43 and a drainage channel 42. A fourth through hole 113 is opened at the bottom side of the multi-way component 11. The processing hole and the fourth through hole 113 are connected to each other. One end of the fourth through hole 113 is connected to the drainage sleeve 41. The drainage sleeve 41 is arranged to incline downward away from the multi-way component 11. The drainage sleeve 41 is arranged to incline downward, so that the jet fluid can enter the decompression hose 43 under the negative pressure state generated by the extraction of the secondary pumping channel 6 and the action of the self-gravity of the jet fluid, avoiding the accumulation and blockage of the jet fluid. The other end of the drainage sleeve 41 is connected to the decompression hose 43. The secondary pumping channel 6 is configured to extract the gas to be mined.

[0053] A second separation surface is provided inside the explosion-proof mechanism 4. Among them, the first separation surface and the second separation surface are configured to separate the gas to be mined. The orifice of the decompression hose 43 connected to the drainage sleeve 41 is provided with the entrance of the drainage channel 42. The outlet of the drainage channel 42 faces downward. The outlet of the drainage channel 42 communicates with the first debris channel, and a first baffle is provided at the outlet of the drainage channel 42. Among them, the first baffle is configured to control the opening and closing of the first debris channel. Among them, the surface of the drainage channel 42 through which the gas to be mined flows constitutes the second separation surface.

[0054] It should be noted that the explosion-proof mechanism 4 mainly guides the orifice fluid blocked in the processing hole to the decompression hose 43, and then cooperates with the drainage channel 42 to separate the solid in the orifice fluid and the gas to be mined. Due to the continuous increase of the gas to be mined, the decompression hose 43 deforms and expands to carry out decompression, and the gas to be mined is extracted from the extraction channel 6.

[0055] This embodiment claims to protect a multi-level explosion-proof device, including a sealing mechanism 1. The sealing mechanism 1 seals the hole to be mined, so that during the extraction process, the gas to be mined will not flow out of any gap of the hole to be mined into the roadway, playing a preliminary guiding role in the flow direction of the gas to be mined, so that the gas to be mined can only flow through the processing hole. Then, in cooperation with the main extraction channel, a first separation surface is provided between the main extraction channel and the processing hole. The first separation surface is used to separate the orifice fluid generated during processing, mainly separating debris and the gas to be mined. Therefore, most of the gas to be mined in the processing hole will enter the main extraction channel. On this basis, in cooperation with the auxiliary extraction channel, the auxiliary extraction channel is used to extract the gas to be mined in the non-sealed section of the processing hole. The comprehensive extraction and removal of the gas to be mined in the processing hole is realized. The multi-level explosion-proof device also includes an explosion-proof mechanism 4, which is mainly used to decompress the gas to be mined when the hole to be mined is in the orifice state. When a large amount of orifice fluid causes blockage in the processing hole during orifice spraying, at this time, the second separation surface separates the solid, and the explosion-proof mechanism 4 rapidly expands and decompresses under the action of the gas to be mined. After decompression is completed, the gas to be mined is extracted from the extraction channel 6.

[0056] Embodiment Two

[0057] Refer to Figure 4 , this embodiment claims to protect a multi-level explosion-proof extraction method, which applies a multi-level explosion-proof device in Embodiment One, including:

[0058] Based on the alignment of the processing hole, one end of the sealing mechanism 1 is blocked to the hole to be mined to form a blocked section, and the processing rod passes through the processing hole;

[0059] Judge whether the hole to be mined is in the orifice state. If not, start the processing rod, and the main extraction channel extracts the gas to be mined in the blocked section of the processing hole, and the auxiliary extraction channel extracts the gas to be mined in the non-blocked section of the processing hole;

[0060] If so, close the processing rod, and the explosion-proof mechanism 4 decompresses the gas to be mined and extracts the gas to be mined from the extraction channel 6.

[0061] Based on the extraction method, a specific scenario of a multi-level explosion-proof device is provided. Specifically, during the coal mine production process, the drill rod drills a hole in the coal seam for gas extraction, and the gas extracted is the gas to be mined. Among them, the drill rod is the processing rod, and the gas is the gas to be mined. In actual operation, it is divided into the following stages:

[0062] Stage 1: Install the multi-level explosion-proof device, including:

[0063] Select the multi-level explosion-proof device, drill a hole in the coal seam through the drill rod, and set corresponding processing holes on the multi-level explosion-proof device. Usually, the lower part of the processing pipeline 100 in the sealing component 10 is made of iron, but there is an opening above the processing pipeline 100, and the opening is closely attached to the first separation surface. The first separation surface and the second separation surface are preferably hydrophobic gas-solid separation membranes. Specifically, it is a PTFE membrane. The PTFE membrane is made of polytetrafluoroethylene as the raw material and is made into a microporous film by special processes such as calendering, extrusion, and biaxial stretching. It mainly utilizes the characteristics of the polytetrafluoroethylene membrane such as smooth surface, chemical resistance, air permeability but water impermeability, large air permeability, flame retardancy, high temperature resistance, strong acid and alkali resistance, and non-toxicity to produce a membrane that can be used for atmospheric dust removal and air purification. The hydrophobic membrane characteristics of the PTFE membrane prevent coal powder and the like from adhering to the surface of the PTFE membrane, resulting in the inability of gas to pass through.

[0064] Process the gas extraction hole channel. A gas extraction hole channel is formed at the front end of the drilled hole, and a card slot is set in the middle of the gas extraction hole channel.

[0065] Assemble the multi-level explosion-proof device. Generally speaking, the assembled multi-level explosion-proof device is not easy to carry, so it is basically assembled on-site. The processing pipeline 100 and the inner barrel 102 are sequentially assembled in the outer barrel 101 to form the sealing component 10. There are openings at the upper and lower parts of the outer barrel 101, and a slurry connection pipeline is connected for grouting and discharging slurry. Place the multi-pass component 11 on one side of the sealing component 10 to ensure that the processing holes are aligned, and then weld the two parts to seal.

[0066] Install the multi-level explosion-proof device, including:

[0067] Install the multi-level explosion-proof device into the gas extraction hole channel. After transporting the assembled sealing component 10 to the designated location underground, put it into the gas extraction hole channel together, and ensure that the stabilizing unit 103 can be stuck into the corresponding card slots. It should be noted that since the multi-level explosion-proof device needs to go deep underground, in actual work, the explosion-proof mechanism 4 is preferably suspended on the coal wall by a cable. Therefore, the explosion-proof mechanism 4 is preferably flexible and telescopic, and its length can theoretically be as long as the roadway at the drilling site. Specifically, how to set it still needs to set a suitable length according to the previous coal mine outburst experience data.

[0068] Grouting: Close the grouting pipeline for discharging slurry, open the grouting pipeline for grouting, grout into the grouting gap, and close the grouting pipeline for grouting after grouting is completed.

[0069] Stage Two: Judge whether the hole to be mined is in the state of gas gushing, and the multi-level explosion-proof device operates.

[0070] When the hole to be mined is not in the state of gas gushing, the operation of the multi-level explosion-proof device includes:

[0071] The main extraction channel conducts extraction. The drill pipe extends into the processing hole for normal drilling. Gas may flow in the gaps between the processing pipeline 100, the hole to be mined and the coal seam. However, due to the blocking effect of the stabilizing unit 103, the gas will not overflow from these gaps to the roadway. When drilling, the gas and drill cuttings will migrate in the processing pipeline 100. Since there are openings above the processing pipeline 100 in this section and there is a gas-solid separation membrane on it, the gas will continuously overflow from the upper part. Since the lower part of the processing pipeline 100 is sealed, water and drill cuttings will not flow out. Some gas may flow to the lower part of the processing pipeline 100, but because the density of the gas is less than that of air, it will continuously rise. In addition, under the action of the negative pressure of the main extraction channel, all the gas will continuously move towards the main extraction channel.

[0072] The auxiliary extraction channel conducts extraction. After passing through the range of the hole to be mined, most of the gas in the processing pipeline 100 is extracted. There is still a small amount of gas that migrates to the inside of the multi-pass component 11 along with the drill cuttings. After being extracted by the auxiliary extraction channel, basically no gas will overflow into the roadway, and the gas content in the roadway can be kept at a relatively low level.

[0073] When the hole to be mined is in the state of gas gushing, the operation of the multi-level explosion-proof device includes:

[0074] The drill pipe stops operating. The first debris channel 31 is closed by the first baffle, and the second debris channel 32 is closed by the second baffle.

[0075] The stabilizing unit 103 is blocked. The gas will move towards the roadway along the pores around the processing pipeline 100 and the coal wall. However, due to the action of the stabilizing unit 103, the gas will be blocked. The high-pressure gas will further increase the strength of the non-Newtonian gas gushing fluid in the stabilizing unit 103 and increase the blocking strength.

[0076] The main extraction channel conducts extraction. Refer to the non-gas-gushing state and will not be elaborated here.

[0077] The auxiliary extraction channel conducts extraction. Refer to the non-gas-gushing state and will not be elaborated here.

[0078] When the explosion-proof mechanism 4 operates, the main extraction channel extraction and the auxiliary extraction channel extraction provide a buffer space for the borehole blowout. However, when the scale of the blowout is large, the blowout fluid formed by gas, drill cuttings and other substances will spray into the multi-way component 11. Since the drill pipe stops rotating, the processing pipeline 100 can be blocked, causing the blowout fluid to migrate towards the drainage sleeve 41. The drainage sleeve 41 is arranged obliquely downward, which is also conducive to the migration of the blowout fluid. After reaching the filter screen, since the first baffle is in a closed state at this time, the ejected coal dust and other substances will remain within the filter screen, while the gas will pass through the filter screen and the second separation surface and rush into the decompression hose 43. As the blowout fluid increases, the gas in the decompression hose 43 continuously increases. Due to the effect of the cable, the decompression hose 43 expands continuously under the action of pressure until the blowout ends, and the gas is extracted from the extraction channel 6.

[0079] After the gas extraction is completed, open the debris channel to handle the drill cuttings.

[0080] Stage three: Remove the multi-level explosion-proof device, stop drilling, remove the drill pipe and drill bit, remove the explosion-proof mechanism 4, open the slurry passing pipeline for discharging slurry, take out the assembled outer barrel 101, inner barrel 102, processing pipeline 100 and multi-way component 11, and continue to use them during the next drilling.

[0081] It should be noted that the material used for grouting is a non-Newtonian fluid, and its production method is to fuse starch and clear water in a certain proportion, usually 2:1 or 3:1.

[0082] The first separation surface and the second separation surface can also adopt other gas-solid separation membranes. Based on the characteristics of being resistant to chemical substances, breathable but impermeable to water, having a large air permeability, flame retardant, high temperature resistant, resistant to strong acids and alkalis, and non-toxic, etc., they can well adapt to the underground environment.

[0083] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-level explosion-proof device, characterized in that: It comprises a sealing mechanism (1), a main extraction channel and an auxiliary extraction channel, one end of the sealing mechanism (1) is sealed in the hole to be extracted to form a sealing section, and the sealing mechanism (1) passes through the processing hole; The input end of the main extraction channel is connected to the processing hole of the plugging section, and a first separation surface is provided at the connecting portion, wherein the main extraction channel is configured to extract the gas to be extracted from the processing hole of the plugging section, and the auxiliary extraction channel is configured to extract the gas to be extracted from the processing hole of the non-plugging section; It also includes an explosion-proof mechanism (4) and a secondary extraction channel (6), wherein the processing hole, the explosion-proof mechanism (4) and the secondary extraction channel (6) are connected in sequence, and a second separation surface is arranged in the explosion-proof mechanism (4), wherein the first separation surface and the second separation surface are configured to separate the gas to be extracted, the explosion-proof mechanism (4) is configured to decompress the gas to be extracted, and the secondary extraction channel (6) is configured to extract the gas to be extracted.

2. A multi-level explosion-proof device according to claim 1, characterized in that: The sealing mechanism (1) comprises a sealing component (10) and a multi-channel component (11); the sealing component (10) is provided in the hole to be mined for sealing, and the sealing component (10) constitutes a blocking section; A multi-way component (11) is provided on the outer side of the sealing component (10) for sealing. A cavity is provided inside the sealing component (10), a processing pipeline (100) is provided inside the cavity, a first separation surface is provided on the surface of the processing pipeline (100) through which the gas to be extracted flows, the multi-way component (11) passes through a first through hole (110), and the first through hole (110) and the processing pipeline (100) are matched to form a processing hole.

3. A multi-level explosion-proof device according to claim 2, characterized in that: A third through hole (112) is provided on the end surface of the multi-channel component (11) close to the sealing component (10), a main gap is formed between the first separation surface a and the cavity, the main gap is connected to one end of the third through hole (112), the other end of the third through hole (112) faces upward, and the third through hole (112) and the main gap constitute the input end of the main pumping channel.

4. A multi-level explosion-proof device according to claim 2, characterized in that: A first debris channel is provided at the bottom of the multi-channel component (11), and an input end of the first debris channel is connected to the first through hole (110). A fourth through hole (113) is provided at the top of the multi-channel component (11), and the fourth through hole (113) is connected to the second through hole (111). The fourth through hole (113) constitutes an input end of the auxiliary extraction channel.

5. A multi-level explosion-proof device according to claim 2, characterized in that: A second through hole (111) is provided at the bottom of the multi-channel component (11); one end of the second through hole (111) is connected to the second through hole (111); the other end of the second through hole (111) is connected to the second debris channel; a second baffle is arranged in the second through hole (111); the second baffle is configured to control the opening and closing of the second debris channel; and the second through hole (111) constitutes the input end of the second debris channel.

6. A multi-level explosion-proof device according to claim 1, characterized in that: The explosion-proof mechanism (4) comprises a drainage sleeve (41), a pressure-reducing hose (43) and a drainage channel (42); a fourth through hole (113) is provided on the bottom side of the multi-channel component (11); the processing hole and the fourth through hole (113) are connected to each other; the fourth through hole (113) is connected to one end of the drainage sleeve (41); the drainage sleeve (41) is arranged to be inclined downward in a direction away from the multi-channel component (11); and the other end of the drainage sleeve (41) is connected to the pressure-reducing hose (43); The outlet of the decompression hose (43) connected to the drainage sleeve (41) is provided with an inlet of the drainage channel (42), and the outlet of the drainage channel (42) faces downward, wherein the surface of the drainage channel (42) through which the gas to be collected flows constitutes a second separation surface.

7. A multi-level explosion-proof device according to claim 6, characterized in that: The outlet of the drainage channel (42) is connected to the first debris channel, and a first baffle is provided at the outlet of the drainage channel (42), wherein the first baffle is configured to control the opening and closing of the first debris channel.

8. A multi-level explosion-proof device according to claim 1, characterized in that: The sealing assembly (10) comprises an outer barrel (101), an inner barrel (102) and a stabilizing unit (103); the outer barrel (101) is sealed and clamped in the hole to be mined through the stabilizing unit (103); the inner barrel (102) and the processing pipeline (100) are coaxially arranged in the outer barrel (101) in sequence; the gap formed between the outer barrel (101) and the inner barrel (102) constitutes a grouting gap, and the gap between the inner barrel (102) and the processing pipeline (100) constitutes a main gap; the grouting gap is connected to one end of a grouting pipeline, and the grouting pipeline and the multi-pass assembly (11) are arranged at positions staggered with each other.

9. A multi-level explosion-proof device according to claim 8, characterized in that: A stabilizing unit (103) is installed on the wall of the outer barrel (101), and the stabilizing unit (103) is in a fan-shaped cross-section configuration, and the central angle of the fan-shaped circle points to the outside of the hole to be mined; A clamping groove is correspondingly arranged in the hole to be mined, and when the end of the outer barrel (101) is tightly fitted with the bottom of the hole to be mined, the stabilizing unit (103) and the clamping groove form a sealed clamping fit.

10. A multi-level explosion-proof extraction method, using a multi-level explosion-proof device according to any one of claims 1 to 9, characterized in that: include: Based on the alignment of the processing holes, one end of the sealing mechanism (1) is sealed to the hole to be mined to form a blocking section, and the processing rod passes through the processing hole; Determine whether the hole to be mined is in a spray hole state. If not, start the processing rod, the main pumping channel extracts the gas to be mined in the processing hole of the blocked section, and the auxiliary pumping channel extracts the gas to be mined in the processing hole of the non-blocked section; If so, the processing rod is closed, the explosion-proof mechanism (4) decompresses the gas to be extracted, and the gas to be extracted is extracted from the extraction channel (6).

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