A fixed-point hole-sealing device for underground coal mine drilling

Abstract

The present invention relates to the technical field of coal mine borehole plugging, and discloses a fixed-point plugging device for underground coal mine boreholes, including a gas extraction pipe inserted into the borehole, a switch valve fixedly installed at one end of the gas extraction pipe, a filter fixedly installed at the other end of the gas extraction pipe, and a plugging mechanism arranged on the gas extraction pipe. The fixed-point plugging device for underground coal mine boreholes can pre-inject slurry into the interior of two grouting bags through the setting of an injection pipe, so that the two grouting bags are packaged to form a plugging work of the borehole, and after the two grouting bags are plugged, grouting work is performed inside the casing, and the grouting plugging work is performed in cooperation with these several injection nozzles, and the directional grouting parts are arranged to direct and locally grout the slurry inside the casing in a backward manner to the gap of the coal seam, thereby improving the grouting plugging effect of the coal seam gap and meeting the law of the change of stratum stress with depth.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine borehole plugging, and specifically to a fixed-point hole plugging device for coal mine underground boreholes. Background Art

[0002] During the process of drilling for efficient, green and intelligent mining in coal mines underground, it is necessary to control gas, and borehole plugging is one of the most basic tasks in coal mine gas control. Currently, the commonly used plugging generally adopts the plugging method of two plugs and one injection; after retrieval, the Chinese invention patent with the publication number CN105604522B discloses a polyurethane long-distance rapid fixed-point hole plugging device and method for coal mine underground boreholes, which can realize the long-distance rapid fixed-point plugging of polyurethane materials; the setting of the partition plate isolates the polyurethane a material and b material in the injection barrel from each other and will not come into contact and foam in advance, and due to the presence of the plastic film, the process of cleaning the injection barrel is eliminated, which is convenient and fast.

[0003] And the Chinese invention patent with the publication number CN116677345B discloses a hole plugging device for gas drainage. By providing a first hole plugging mechanism and a compressible component on the pipeline connector, when the grouting bladder expands after grouting, the area where the pipeline connector is located will be closed. At this time, grouting is carried out in the area where the pipeline connector is located. As the slurry enters, the slurry will squeeze the compressible component, and the compressible component can provide power for the movement of the puncture rod. The puncture rod can penetrate into the wall of the drainage hole, so that the slurry at the pipeline connector can enter the gaps in the wall of the drainage hole through the puncture rod, reducing its permeability and effectively improving the sealing effect.

[0004] In the related art, most of the existing fixed-point hole plugging devices use two bladders arranged in a pipeline for plugging. After plugging, slurry is injected between the two bladders for plugging; during the grouting plugging process, when injecting slurry between the two bladders, due to the large distance between the two bladders and the large number of criss-crossing coal seam gaps, a relatively high grouting pressure is required to form the plugging work during grouting plugging, lacking the function of sequential positioning grouting plugging. As a result, when grouting and plugging the small gaps deep in the coal seam, the slurry is not easy to penetrate into them to form the plugging work, thereby reducing the grouting plugging performance. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a fixed-point hole-sealing device for drilling in coal mines. Through the setting of the directional grouting component, it is used to perform directional and local grouting and plugging on the cracks in the coal seam in a backward manner with the slurry inside the casing, thereby improving the effect of grouting and plugging the cracks in the coal seam, meeting the variation law of formation stress with depth, and solving the problem that when the hole-sealing device using the two-block-one-injection method in the prior art performs grouting and plugging, due to the use of full-range grouting and plugging, the high-intensity grouting pressure cannot be transmitted to the fine and deep cracks, and thus the fine and deep cracks cannot be grouted, affecting its plugging performance.

[0007] (II) Technical Solution

[0008] To achieve the above object, the present invention provides the following technical solution: A fixed-point hole-sealing device for drilling in coal mines, including a gas extraction pipe inserted into the drilling hole. One end of the gas extraction pipe is fixedly installed with a switch valve, and the other end of the gas extraction pipe is fixedly installed with a filter. A plugging mechanism is arranged on the gas extraction pipe;

[0009] The plugging mechanism includes a casing fixed on the outer surface of the gas extraction pipe and a material injection pipe for injecting material into the casing. Both ends of the casing are fixedly connected with grouting bladder bags. The two grouting bladder bags are fixedly communicated through a drainage pipe. A material injection nozzle is arranged on the outer surface of the casing, and a one-way valve plate is arranged inside the material injection nozzle;

[0010] A directional grouting component is arranged inside the casing, and a pressure detection component is installed on the directional grouting component.

[0011] Preferably, the material injection pipe is arranged inside the casing. One end of the material injection pipe is fixedly communicated with the inside of the grouting bladder bag at the initial end position, and a pressure explosion valve is installed at one end of the material injection pipe. The other end of the material injection pipe sequentially penetrates through the casing and the grouting bladder bag at the end and extends to the outside of the grouting bladder bag at the end. One end of the material injection pipe is fixedly communicated with an annular frame. A material injection main pipe is fixedly communicated with the annular frame, and a one-way control valve is installed on the material injection main pipe.

[0012] Preferably, the directional grouting component includes a baffle plate slidably sleeved on the outer surface of the gas extraction pipe. The outer surface of the baffle plate is in sealed contact with the inner surface of the casing, and the baffle plate is fixedly connected with the material injection pipe;

[0013] The number of the material injection nozzles is several, and several material injection nozzles are installed on the outer surface of the casing in an equidistant surrounding manner;

[0014] The annular frame is installed on the outer surface of the gas extraction pipe in a slidable sleeved manner.

[0015] Preferably, a plurality of circular partition plates are connected to the outer surface of the casing, and the plurality of partition plates are located between two adjacent injection nozzles, and the diameters of the plurality of partition plates are less than or equal to the inner diameter of the drilling hole.

[0016] Preferably, the pressure detection assembly includes an L-shaped frame installed on the coal mine shaft wall through a fastening bolt and a pressure detection plate detachably installed on the annular frame, and a pressure sensor for detecting the stretching pressure of the pressure detection plate is arranged on the L-shaped frame.

[0017] Preferably, a plurality of clamping holes are formed inside the pressure detection plate, one side of the inner wall of the L-shaped frame is slidably connected with a moving plate, and a plug for inserting into one of the clamping holes is fixedly connected to the top of the moving plate. An extrusion spring for upwardly extruding the moving plate is arranged inside the L-shaped frame;

[0018] One side of the plug is arranged as an inclined surface, and one side of the inner wall of each of the plurality of clamping holes is arranged as an inclined surface parallel to one side of the plug.

[0019] Preferably, a return pipe is fixedly connected to the end of the casing, one end of the return pipe is communicated with the inside of the gas extraction pipe, and a filter membrane nozzle is fixedly installed at the other end of the return pipe. A gas-liquid separation member is installed at one end of the gas extraction pipe.

[0020] Preferably, the gas-liquid separation member includes a three-way valve fixedly installed at one end of the gas extraction pipe, a separation cylinder is detachably installed at the bottom of the three-way valve, a drain pipe is fixedly communicated with the bottom of the separation cylinder, a floating plate is slidably connected to the inner surface of the separation cylinder, and a blocking block is fixedly connected to the bottom of the floating plate through a connecting rod. The blocking block is used for sealing and blocking the top of the drain pipe.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention provides a fixed-point hole sealing device for drilling in coal mines, and has the following beneficial effects:

[0023] 1. Through the setting of the injection pipe, the present invention can pre-inject slurry into the interiors of two grouting bladder bags, enabling the two grouting bladder bags to be encapsulated to form the plugging work of the borehole. After the two grouting bladder bags are plugged, grouting work is carried out inside the casing, and in cooperation with these several injection nozzles, grouting plugging work is carried out. Through the setting of the directional grouting member, it is used to perform directional and local grouting plugging work on the seams of the coal seam in a retreating manner with the slurry inside the casing, thereby improving the effect of grouting plugging of the coal seam seams, meeting the variation law of formation stress with depth, and solving the problem that in the existing plugging device of the two-block-one-injection method during grouting plugging, due to the use of full-range grouting plugging, the high-intensity grouting pressure cannot be transmitted to the fine and deep seams, and thus the fine and deep seams cannot be grouted, affecting its plugging performance.

[0024] 2. On one side of the bolt and the inner side wall of the clamping hole of the present invention are inclined surfaces. When the bolt is inserted into the interior of the clamping hole, as the grouting plugging pressure of the plugging mechanism gradually increases, the pressure detection plate will perform a lateral movement. When the pressure detection plate moves laterally, it can squeeze the bolt. With the contact of the two inclined surfaces, the bolt can move downward. When the bolt moves downward until it completely disengages from the interior of the clamping hole, the directional grouting member will move to the directional grouting position of the next stage. Through the upward extrusion of the compression spring on the moving plate and the bolt, the bolt can be inserted into the adjacent clamping hole to form pressure detection and release work. It not only has good pressure detection work, but also can automatically release when the pressure reaches the threshold value, and through the two-stage pressure detection and release work.

[0025] 3. When the liquid level inside the separation cylinder rises to the position of the floating plate and continues to rise, the floating plate can move upward following the liquid level, and thus can drive the blocking block upward, causing the blocking block to lose its blockage of the drain pipe, thereby realizing the export work of the stored water source inside the separation cylinder. Moreover, during the export process, no gas leakage problem will occur, and it has good gas-liquid separation and classified export functions, further improving the plugging and extraction performance of the fixed-point plugging device, and solving the diversity in the extraction through the gas extraction pipe in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the fixed-point plugging device for boreholes in coal mines of the present invention;

[0027] Figure 2 For the present invention Figure 1 is a schematic structural diagram of the plugging mechanism in;

[0028] Figure 3 For the present invention Figure 2 is a cross-sectional schematic diagram of the plugging mechanism in;

[0029] Figure 4 For the present invention Figure 3 Partial enlarged view of location A in the present invention;

[0030] Figure 5 For the present invention Figure 1 Schematic structural diagram of the pressure detection component in the present invention;

[0031] Figure 6 For the present invention Figure 5 Schematic structural diagram of the L-shaped frame in the present invention;

[0032] Figure 7 For the present invention Figure 1 Schematic cross-sectional view of the separation cylinder in the present invention;

[0033] Figure 8 Schematic working diagram of the fixed-point hole-sealing device for drilling in coal mines underground of the present invention;

[0034] Figure 9 For the present invention Figure 8 Front schematic view.

[0035] In the figure: 1, gas extraction pipe; 2, switch valve; 3, filter;

[0036] 4, plugging mechanism; 41, casing; 42, injection pipe; 43, grouting bladder; 44, drainage pipe; 45, injection nozzle; 46, pressure explosion valve; 47, annular frame; 48, injection main pipe;

[0037] 49, directional grouting member; 491, baffle; 492, partition plate;

[0038] 5, pressure detection component; 51, L-shaped frame; 52, pressure detection plate; 53, pressure sensor; 54, clamping hole; 55, moving plate; 56, plug; 57, extrusion spring; 58, adjusting plate; 59, bolt rod;

[0039] 6, return pipe; 7, filter membrane nozzle; 8, three-way valve; 9, separation cylinder; 10, drain pipe; 11, floating plate; 12, blocking block. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1:

[0042] Refer to the attached Figure 1-9, A fixed-point hole-sealing device for underground coal mine drilling, including a gas extraction pipe 1 inserted into the drilling hole. One end of the gas extraction pipe 1 is fixedly installed with a switch valve 2, and the other end of the gas extraction pipe 1 is fixedly installed with a filter 3. A plugging mechanism 4 is arranged on the gas extraction pipe 1;

[0043] Through the setting of the plugging mechanism 4, it is used for the fixed-point hole-sealing work of two-block-one-injection for underground coal mine drilling. Through the setting of the gas extraction pipe 1, the gas deep in the coal mine drilling is extracted and recycled. Through the setting of the filter 3, it is used for filtering the gas, thereby improving the gas recovery effect;

[0044] The plugging mechanism 4 includes a casing 41 fixed on the outer surface of the gas extraction pipe 1 and a feeding pipe 42 for injecting materials into the casing 41. Both ends of the casing 41 are fixedly connected with grouting bladder bags 43. The two grouting bladder bags 43 are fixedly communicated through a drainage pipe 44. A feeding nozzle 45 is arranged on the outer surface of the casing 41, and a one-way valve plate is arranged inside the feeding nozzle 45;

[0045] Through the setting of the feeding pipe 42, the slurry can be pre-injected into the two grouting bladder bags 43 in advance, so that the two grouting bladder bags 43 are encapsulated to form the plugging work of the drilling hole. After the two grouting bladder bags 43 are plugged, the slurry is injected into the casing 41, and the plugging work is carried out in cooperation with a number of feeding nozzles 45;

[0046] A directional grouting member 49 is arranged inside the casing 41, and a pressure detection component 5 is installed on the directional grouting member 49;

[0047] Through the setting of the directional grouting member 49, it is used to carry out directional and local grouting plugging work on the seams of the coal seam with the slurry inside the casing 41 in a retracted manner, thereby improving the grouting plugging effect of the coal seam seams and meeting the variation law of formation stress with depth;

[0048] It solves the problem that when the hole-sealing device of the two-block-one-injection method in the prior art is grouting and plugging, due to the use of full-range grouting and plugging, the high-strength grouting pressure cannot be transmitted to the small and deep seams, so the small and deep seams cannot be grouted, affecting its plugging performance.

[0049] Refer to the appendix Figures 1 to 4 , The feeding pipe 42 is arranged inside the casing 41. One end of the feeding pipe 42 is fixedly communicated with the inside of the grouting bladder bag 43 at the initial end position, and a pressure explosion valve 46 is installed at one end of the feeding pipe 42. The other end of the feeding pipe 42 sequentially penetrates the casing 41 and the grouting bladder bag 43 at the end and extends to the outside of the grouting bladder bag 43 at the end. One end of the feeding pipe 42 is fixedly communicated with an annular frame 47. A feeding main pipe 48 is fixedly communicated with the annular frame 47, and a one-way control valve is installed on the feeding main pipe 48;

[0050] One end of the injection pipe 42 is fixedly connected to the inside of the grouting bag 43 at the initial end position, facilitating the direct injection of slurry into the inside of the grouting bag 43 when injecting through the injection pipe 42. The two grouting bags 43 are fixedly connected through the drainage pipe 44, facilitating the drainage of the slurry inside the grouting bag 43 to another grouting bag 43 through the drainage pipe 44, enabling the two grouting bags 43 to expand synchronously to form a plugging operation.

[0051] The pressure explosion valve 46 adopts an air explosion valve in the prior art. When the pressure reaches the threshold value, an explosion will occur, thereby facilitating the injection of the injection pipe 42 into the inside of the casing 41 to form a grouting plugging operation.

[0052] Through the setting of the injection main pipe 48, it is used to discharge the prepared slurry into the injection pipe 42. Through the injection pipe 42, a plugging injection operation is carried out. Through the setting of the one-way control valve, it is used to conduct one-way control of the injection main pipe 48, thereby avoiding the phenomenon of slurry backflow and further improving the stability of its grouting plugging.

[0053] Refer to the appendix Figures 1 to 4 The directional grouting member 49 includes a baffle 491 slidably sleeved on the outer surface of the gas extraction pipe 1. The outer surface of the baffle 491 is in sealed contact with the inner surface of the casing 41, and the baffle 491 is fixedly connected to the injection pipe 42.

[0054] Through the setting of the baffle 491, it is used to divide the inside of the casing 41 into an injection cavity and a cavity to be injected. Through the fixed connection between the baffle 491 and the injection pipe 42, when the grouting pressure in the injection cavity reaches the specified range, the pressure explosion valve 46 will explode, and the baffle 491 will move in a retracting manner, which can drive the injection pipe 42 to move synchronously in the same direction. Moreover, it can drive the annular frame 47 to move synchronously in the same direction. The pressure detection component 5 detects the pressure of the movement of the annular frame 47 to understand its grouting pressure.

[0055] The number of injection nozzles 45 is several, and several injection nozzles 45 are installed on the outer surface of the casing 41 in an equidistant surrounding manner.

[0056] Refer to the appendix Figure 1 or Figure 2 Several injection nozzles 45 are divided into five groups, and each group has six, which are arranged in an equidistant layer-by-layer manner. Specifically, it can be set according to the actual situation, which not only facilitates the retracting fixed-point grouting plugging operation but also improves the dispersibility of grouting and increases the scope of its grouting plugging.

[0057] The annular frame 47 is installed on the outer surface of the gas extraction pipe 1 in a slidably sleeved manner.

[0058] The annular frame 47 is sleeved on the outer surface of the gas extraction pipe 1 in a sliding manner, which facilitates the guiding movement of the annular frame 47 along the axial direction of the gas extraction pipe 1, improves the orderliness and balance of its movement, and further improves the accuracy of subsequent pressure detection.

[0059] Refer to the appendix Figure 2 and Figure 3 , a plurality of circular partition plates 492 are connected to the outer surface of the casing 41, and the plurality of partition plates 492 are located between two adjacent injection nozzles 45, and the diameters of the plurality of partition plates 492 are less than or equal to the inner diameter of the drilling hole;

[0060] Through the arrangement of the partition plates 492, it is used to divide two sets of separated injection nozzles 45, so that during grouting plugging, a backward grouting operation is performed to form a positioning grouting plugging operation, which further improves the effect of coal seam crack grouting plugging and solves the problem in the prior art that during the two-block-one-injection plugging operation, when grouting and plugging, a large-range grouting operation is directly adopted. Due to the large grouting range, the grouting pressure is large, which directly affects the crack grouting plugging performance.

[0061] Refer to the appendix Figure 5 and Figure 6 , the pressure detection assembly 5 includes an L-shaped frame 51 installed on the coal mine shaft wall through fastening bolts and a pressure detection plate 52 detachably installed on the annular frame 47. A pressure sensor 53 for detecting the stretching pressure of the pressure detection plate 52 is arranged on the L-shaped frame 51.

[0062] Since the pressure detection plate 52 in the pressure detection assembly 5 is fixedly connected to the annular frame 47, when the annular frame 47 in the plugging mechanism 4 moves laterally, it is convenient to drive the pressure detection plate 52 to move laterally synchronously. By detecting the pressure of the lateral movement of the pressure detection plate 52 through the pressure sensor 53, the detection work of the plugging grouting pressure can be formed.

[0063] Embodiment 2: Different from Embodiment 1;

[0064] Refer to the appendix Figure 5 and Figure 6 , a plurality of card holes 54 are opened inside the pressure detection plate 52. One side of the inner wall of the L-shaped frame 51 is slidably connected with a moving plate 55, and a plug 56 for inserting into one of the card holes 54 is fixedly connected to the top of the moving plate 55. An extrusion spring 57 for upwardly extruding the moving plate 55 is arranged inside the L-shaped frame 51; one side of the plug 56 is set as an inclined surface, and one side of the inner walls of the plurality of card holes 54 is set as an inclined surface parallel to one side of the plug 56;

[0065] One side of the plug pin 56 and the inner side wall of the clamping hole 54 are inclined surfaces. When the plug pin 56 is inserted into the inside of the clamping hole 54, as the grouting plugging pressure of the plugging mechanism 4 gradually increases, it causes the pressure detection plate 52 to move laterally. And when the pressure detection plate 52 moves laterally, it can squeeze the plug pin 56. With the contact of the two inclined surfaces, the plug pin 56 can be made to move downward;

[0066] When the plug pin 56 moves downward until it completely disengages from the inside of the clamping hole 54, its directional grouting member 49 will move to the directional grouting position of the next stage. By squeezing the spring 57 to squeeze the moving plate 55 and the plug pin 56 upward, the plug pin 56 can be inserted into the adjacent clamping hole 54, forming a pressure detection and release operation. It not only has good pressure detection work, but also can automatically release when the pressure reaches the threshold value, and performs a two-stage pressure detection and release operation;

[0067] It should be noted here that the squeezing force of the squeezing spring 57 on the moving plate 55 and the plug pin 56 is equal to the strength of the directional grouting plugging of the plugging mechanism 4;

[0068] One side of the inner wall of the L-shaped frame 51 is slidably connected with an adjusting plate 58, and both ends of the squeezing spring 57 are respectively fixed between the moving plate 55 and the adjusting plate 58. The pressure sensor 53 is installed between the squeezing spring 57 and the adjusting plate 58;

[0069] By setting the pressure sensor 53, the pressure of the squeezing spring 57 can be detected, so as to realize the force when the pressure detection plate 52 moves laterally, and finally understand the strength of the grouting plugging;

[0070] The bottom of the L-shaped frame 51 is threadedly connected with a bolt rod 59 for adjusting the height of the adjusting plate 58 up and down. The top end of the bolt rod 59 is rotatably connected to the bottom of the adjusting plate 58;

[0071] By manually rotating and controlling the bolt rod 59, the position of the adjusting plate 58 can be adjusted in height, and then the initial height of the squeezing spring 57 can be adjusted, so as to realize the adjustment of the squeezing coefficient of the squeezing spring 57 on the moving plate 55 and the plug pin 56, and further meet the grouting plugging work with different strengths, improving the diversity of the borehole plugging in the coal mine underground.

[0072] Embodiment 3: Different from Embodiment 1;

[0073] Refer to the appendix Figure 4 and Figure 7 , the end of the casing 41 is fixedly connected with a return pipe 6. One end of the return pipe 6 is communicated with the inside of the gas extraction pipe 1, and the other end of the return pipe 6 is fixedly installed with a filter membrane nozzle 7. One end of the gas extraction pipe 1 is equipped with a gas-liquid separation member;

[0074] Through the setting of the reflux pipe 6, when grouting and plugging the coal seam fractures, it is convenient for the gas temporarily stored in the fractures to be discharged into the gas extraction pipe 1 through the reflux pipe 6 for recycling when the slurry enters the fractures, which enhances the grouting and reinforcement effect deep in the coal seam fractures and solves the problem that when a closed-loop phenomenon occurs in the deep fractures of the coal seam, the slurry is not easy to invade, affecting the grouting and plugging effect.

[0075] By installing a filter membrane nozzle 7 on the reflux pipe 6, it is convenient to fill the fractures with slurry and set it between the two grouting sacs 43. The slurry can be solid-liquid separated through the filter membrane nozzle 7 to reduce the moisture in the slurry, thereby improving the subsequent slurry plugging and solidification efficiency and solving the problem in the prior art that due to the need for the slurry to flow in narrow gaps, there is more moisture in the slurry, resulting in the slurry being unable to solidify quickly and reducing its plugging performance.

[0076] The gas-liquid separation part includes a three-way valve 8 fixedly installed at one end of the gas extraction pipe 1. A separation cylinder 9 is detachably installed at the bottom of the three-way valve 8. A drain pipe 10 is fixedly connected to the bottom of the separation cylinder 9. A floating plate 11 is slidably connected to the inner surface of the separation cylinder 9. A blocking block 12 is fixedly connected to the bottom of the floating plate 11 through a connecting rod. The blocking block 12 is used to seal and block the top of the drain pipe 10.

[0077] By installing the separation cylinder 9, it is convenient to separate the gas and liquid generated during the preliminary plugging. When the gas and liquid are discharged into the interior of the separation cylinder 9 through the gas extraction pipe 1, since the separation cylinder 9 is in a sealed state at this time, the liquid is stored in the separation cylinder 9, and the gas is discharged into the gas transmission pipeline through the position of the switch valve 2 for unified transmission work.

[0078] When the liquid level inside the separation cylinder 9 rises to the position of the floating plate 11 and with the continuous rise of the liquid level, the floating plate 11 can move upward along with the liquid level, and then can drive the blocking block 12 to move upward, so that the blocking block 12 loses the blockage of the drain pipe 10, thereby realizing the export work of the water source stored inside the separation cylinder 9. Moreover, during the export process, no gas leakage problem will occur, and it has good gas-liquid separation and classification export functions, further improving the plugging and extraction performance of the fixed-point hole sealing equipment and solving the diversity in extraction through the gas extraction pipe 1 in the prior art.

[0079] As the water source is discharged, the liquid level will gradually drop, and the floating plate 11 and the blocking block 12 will also drop accordingly, so that the blocking block 12 resumes the blocking work.

[0080] It should be noted that the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0081] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixed-point sealing device for drilling holes in coal mines, comprising a gas extraction pipe (1) inserted into the borehole, a switch valve (2) fixedly mounted on one end of the gas extraction pipe (1), and a filter (3) fixedly mounted on the other end of the gas extraction pipe (1), characterized in that: The gas extraction pipe (1) is provided with a blocking mechanism (4); The blocking mechanism (4) comprises a sleeve (41) fixed to the outer surface of the gas extraction pipe (1) and an injection pipe (42) for injecting material into the sleeve (41); both ends of the sleeve (41) are fixedly connected to grouting bags (43); the two grouting bags (43) are fixedly connected via a drainage pipe (44); an injection nozzle (45) is provided on the outer surface of the sleeve (41); a one-way valve plate is provided inside the injection nozzle (45); one end of the injection pipe (42) is fixedly connected to an annular frame (47); and the annular frame (47) is fixedly connected to an injection main pipe (48); A directional grouting piece (49) is arranged inside the sleeve (41), and a pressure detection assembly (5) is installed on the directional grouting piece (49). The pressure detection assembly (5) comprises an L-shaped frame (51) installed on the wall of the coal mine by fastening bolts and a pressure detection plate (52) detachably installed on the annular frame (47), and a pressure sensor (53) for detecting the extension pressure of the pressure detection plate (52) is arranged on the L-shaped frame (51); a plurality of clamping holes (54) are opened inside the pressure detection plate (52), a moving plate (55) is slidably connected to one side of the inner wall of the L-shaped frame (51), and a latch (56) for inserting into one of the clamping holes (54) is fixedly connected to the top of the moving plate (55), and a pressing spring (57) for pressing the moving plate (55) upward is arranged inside the L-shaped frame (51); One side of the latch pin (56) is arranged as an inclined surface, and one side of the inner wall of the plurality of latch holes (54) is arranged as an inclined surface parallel to the one side of the latch pin (56).

2. A fixed-point sealing device for drilling holes in coal mines according to claim 1, characterized in that: The injection pipe (42) is arranged inside the sleeve (41), one end of the injection pipe (42) is fixedly connected to the inside of the grouting bag (43) at the initial end position, and a pressure explosion valve (46) is installed at one end of the injection pipe (42), the other end of the injection pipe (42) passes through the sleeve (41) and the grouting bag (43) at the end in sequence and extends to the outside of the grouting bag (43) at the end, and a one-way control valve is installed on the injection main pipe (48).

3. A fixed-point sealing device for drilling holes in coal mines according to claim 2, characterized in that: The directional grouting member (49) comprises a baffle (491) slidably mounted on the outer surface of the gas extraction pipe (1), the outer surface of the baffle (491) being in sealing contact with the inner surface of the sleeve (41), and the baffle (491) being fixedly connected to the injection pipe (42); The number of the injection nozzles (45) is multiple, and the multiple injection nozzles (45) are installed on the outer surface of the sleeve (41) in an equidistant and surrounding manner; The annular frame (47) is mounted on the outer surface of the gas extraction pipe (1) in a sliding sleeve manner.

4. A fixed-point sealing device for drilling holes in coal mines according to claim 3, characterized in that: The outer surface of the sleeve (41) is connected to a plurality of circular partition plates (492), and the plurality of partition plates (492) are located between two injection nozzles (45), and the diameter of the plurality of partition plates (492) is less than or equal to the inner diameter of the drilled hole.

5. A fixed-point sealing device for drilling holes in coal mines according to claim 1, characterized in that: The end of the sleeve (41) is fixedly connected to a return pipe (6), one end of the return pipe (6) is in communication with the interior of the gas extraction pipe (1), and the other end of the return pipe (6) is fixedly mounted with a filter nozzle (7), and one end of the gas extraction pipe (1) is mounted with a gas-liquid separation element.

6. A fixed-point sealing device for drilling holes in coal mines according to claim 5, characterized in that: The gas-liquid separation component comprises a three-way valve (8) fixedly mounted on one end of the gas extraction pipe (1), and a separation cylinder (9) is detachably mounted on the bottom of the three-way valve (8), the bottom of the separation cylinder (9) is fixedly connected to a drainage pipe (10), the inner surface of the separation cylinder (9) is slidably connected to a floating plate (11), and the bottom of the floating plate (11) is fixedly connected to a blocking block (12) via a connecting rod, and the blocking block (12) is used to seal and block the top of the drainage pipe (10).

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