Fixed-point hole sealing device for coal mine underground drilling

Abstract

The invention relates to the technical field of coal mine drilling hole plugging, and discloses a fixed-point hole sealing device for coal mine underground drilling, which comprises a gas extraction pipe inserted in a drilling hole, one end of the gas extraction pipe is fixedly provided with a switch valve, the other end of the gas extraction pipe is fixedly provided with a filter, and the gas extraction pipe is provided with a plugging mechanism. According to the fixed-point hole sealing device for coal mine underground drilling, through the arrangement of the material injection pipe, slurry can be injected into the two slurry injection bags in advance, so that the two slurry injection bags are sealed, drilling plugging work is formed, after the two slurry injection bags are plugged, slurry injection work is conducted on the interior of a sleeve, and drilling is completed. The directional grouting piece is arranged and used for conducting directional and local grouting plugging work on the seam of the coal seam through the slurry in the sleeve in a retreating mode, then the grouting plugging effect of the seam of the coal seam is improved, and the change rule of the stratum stress along with the depth is met.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine borehole sealing, in particular to a fixed-point hole sealing device for underground coal mine boreholes. Background Art

[0002] In the process of implementing efficient, green and intelligent mining and drilling in coal mines, gas needs to be controlled, and drilling and sealing work is one of the most basic tasks of coal mine gas control. At present, the commonly used sealing method generally adopts a two-blocking and one-injection sealing method; after searching, the Chinese invention patent with publication number CN105604522B discloses a long-distance rapid fixed-point sealing device and method for drilling holes in coal mines, which can realize long-distance rapid fixed-point sealing of polyurethane materials; the setting of the partition isolates the polyurethane a material and b material in the injection barrel from each other, and they will not contact each other 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 quick.

[0003] And a Chinese invention patent with publication number CN116677345B discloses a gas extraction hole sealer, which is provided with a first sealing mechanism and a compressible component on the pipe connector. When the grouting bag expands after grouting, the area where the pipe connector is located will be sealed. At this time, grouting is injected into the area where the pipe connector is located. As the slurry enters, the slurry will squeeze the compressible component. The compressible component can provide power for the movement of the puncture rod, and the puncture rod can penetrate into the wall of the extraction hole. In this way, the slurry at the pipe connector can enter the gap in the wall of the extraction hole through the puncture rod, thereby reducing its permeability and effectively improving the sealing effect.

[0004] In the related art, most of the existing fixed-point sealing devices use pipelines to set two bags for sealing. After sealing, slurry is injected between the two bags for sealing. When grouting is performed, when slurry is injected between the two bags for sealing, since the distance between the two bags is large, there are many criss-crossing coal seam gaps, so that when grouting is performed, a higher grouting pressure is required to form a sealing work, and there is a lack of sequential positioning grouting sealing function, so that when grouting is performed to seal small gaps deep in the coal seam, the slurry is not easy to invade to form a sealing work, thereby reducing the grouting sealing performance. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a fixed-point sealing device for underground drilling in coal mines. Through the arrangement of directional grouting parts, the slurry inside the casing is used to perform directional and local grouting and sealing work on the gaps in the coal seam in a backward manner, thereby improving the grouting and sealing effect of the coal seam gaps, meeting the law of change of formation stress with depth, and solving the problem that the sealing device of the prior art using two blocking and one injection method cannot transmit high-intensity grouting pressure to small and deep gaps due to the full-range grouting plugging during grouting sealing, and thus cannot grout small and deep gaps, affecting its sealing performance.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a fixed-point sealing device for drilling holes in coal mines, comprising 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 sealing mechanism provided on the gas extraction pipe;

[0009] The blocking mechanism comprises a sleeve fixed to the outer surface of the gas extraction pipe and an injection pipe for injecting material into the sleeve, both ends of the sleeve are fixedly connected with grouting bags, the two grouting bags are fixedly connected through a drainage pipe, the outer surface of the sleeve is provided with an injection nozzle, and the inside of the injection nozzle is provided with a one-way valve plate;

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

[0011] Preferably, the injection tube is arranged inside the casing, one end of the injection tube is fixedly connected with the inside of the grouting bag at the initial end position, and a pressure burst valve is installed at one end of the injection tube, the other end of the injection tube passes through the casing and the grouting bag at the end in sequence and extends to the outside of the grouting bag at the end, one end of the injection tube is fixedly connected with an annular frame, the annular frame is fixedly connected with an injection main pipe, and a one-way control valve is installed on the injection main pipe.

[0012] Preferably, the directional grouting member comprises a baffle slidably sleeved on the outer surface of the gas extraction pipe, the outer surface of the baffle is in sealing contact with the inner surface of the sleeve, and the baffle is fixedly connected to the injection pipe;

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

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

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

[0016] Preferably, the pressure detection assembly includes an L-shaped frame installed on the coal mine wall by fastening bolts and a pressure detection plate detachably installed on the annular frame, and the L-shaped frame is provided with a pressure sensor for detecting the extension pressure of the pressure detection plate.

[0017] Preferably, a plurality of clamping holes are provided inside the pressure detection plate, a movable plate is slidably connected to one side of the inner wall of the L-shaped frame, and a latch for inserting into one of the clamping holes is fixedly connected to the top of the movable plate, and an extrusion spring for pressing the movable plate upward is provided inside the L-shaped frame;

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

[0019] Preferably, the end of the sleeve is fixedly connected with a return pipe, one end of the return pipe is connected with the interior of the gas extraction pipe, and the other end of the return pipe is fixedly installed with a filter membrane nozzle, and one end of the gas extraction pipe is installed with a gas-liquid separator.

[0020] Preferably, the gas-liquid separation component includes a three-way valve fixedly mounted on one end of the gas extraction pipe, and a separation cylinder is detachably mounted on the bottom of the three-way valve, the bottom of the separation cylinder is fixedly connected to a drain pipe, 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 via a connecting rod, and the blocking block is used to seal and block the top of the drain pipe.

[0021] (III) Beneficial effects

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

[0023] 1. The present invention can pre-inject slurry into the interior of two grouting bags through the arrangement of the injection pipe, so that the two grouting bags are sealed to form a borehole plugging work. After the two grouting bags are sealed, grouting work is performed on the interior of the casing, and the grouting plugging work is performed in cooperation with these several injection nozzles. Through the arrangement of the directional grouting parts, the slurry inside the casing is used to perform directional and local grouting plugging work on the gaps of the coal seam in a backward manner, thereby improving the grouting plugging effect of the coal seam gaps, meeting the law of the change of formation stress with depth, and solving the problem that the sealing device of the two-blocking and one-injection method in the prior art cannot transmit the high-intensity grouting pressure to the small and deep gaps due to the full-range grouting plugging during grouting plugging, and thus cannot grout the small and deep gaps, thereby affecting its plugging performance.

[0024] 2. In the present invention, one side of the latch and the inner side wall of the hole are inclined surfaces. The latch is inserted into the hole. As the grouting and sealing pressure of the sealing mechanism gradually increases, the pressure detection plate moves sideways. The lateral movement of the pressure detection plate can squeeze the latch, and the contact of the two inclined surfaces can make the latch move downward. When the latch moves downward and is completely disengaged from the hole, its directional grouting part moves to the directional grouting position of the next stage. The moving plate and the latch are squeezed upward by the extrusion spring, so that the latch can be inserted into the adjacent hole, forming pressure detection and release work. It not only has good pressure detection work, but also can automatically release the pressure when the pressure reaches a threshold value, and performs two-stage pressure detection and release work.

[0025] 3. When the liquid level inside the separation cylinder of the present invention rises to the position of the float plate, the float plate can move upward with the liquid surface in coordination with the continuous rise of the liquid level, thereby driving the blocking block to move upward, so that the blocking block loses the blockage of the drain pipe, thereby realizing the export of the water source stored in the separation cylinder, and in the process of exporting, it will not cause the problem of gas leakage. It has good gas-liquid separation and classified export functions, further improves the sealing and extraction performance of the fixed-point sealing equipment, and solves the diversity of extraction through the gas extraction pipe in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a fixed-point hole sealing device for underground drilling in a coal mine according to the present invention;

[0027] Figure 2 For the present invention Figure 1 A schematic diagram of the structure of the middle blocking mechanism;

[0028] Figure 3 For the present invention Figure 2 A schematic cross-sectional view of the plugging mechanism;

[0029] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A;

[0030] Figure 5 For the present invention Figure 1 A schematic diagram of the structure of the medium pressure detection component;

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

[0032] Figure 7 For the present invention Figure 1 A schematic cross-sectional view of a separation cylinder;

[0033] Figure 8 This is a working schematic diagram of the fixed-point hole sealing device for underground drilling in a coal mine according to the present invention;

[0034] Fig. 9 For the present invention Figure 8 Front view diagram of .

[0035] In the figure: 1. Gas extraction pipe; 2. Switch valve; 3. Filter;

[0036] 4. Sealing mechanism; 41. Casing; 42. Injection pipe; 43. Grouting bag; 44. Drainage pipe; 45. Injection nozzle; 46. Pressure explosion valve; 47. Ring frame; 48. Injection main pipe;

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

[0038] 5. Pressure detection assembly; 51. L-shaped frame; 52. Pressure detection plate; 53. Pressure sensor; 54. Clamp hole; 55. Moving plate; 56. Latch; 57. Extrusion spring; 58. Adjustment plate; 59. Bolt rod;

[0039] 6. Reflux pipe; 7. Filter membrane nozzle; 8. Three-way valve; 9. Separation cylinder; 10. Drain pipe; 11. Floating plate; 12. Blocking block. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1:

[0042] See attached Figure 1-9A fixed-point sealing device for underground boreholes in coal mines, comprising a gas extraction pipe 1 inserted into the borehole, a switch valve 2 fixedly installed at one end of the gas extraction pipe 1, a filter 3 fixedly installed at the other end of the gas extraction pipe 1, and a sealing mechanism 4 arranged on the gas extraction pipe 1;

[0043] The plugging mechanism 4 is used to perform a two-blocking and one-injection fixed-point plugging work on the boreholes in the coal mine. The gas extraction pipe 1 is used to extract and recover the gas deep in the coal mine borehole. The filter 3 is used to filter the gas, thereby improving the gas recovery effect.

[0044] The plugging mechanism 4 includes 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 with grouting bags 43. The two grouting bags 43 are fixedly connected through a drainage pipe 44. The outer surface of the sleeve 41 is provided with an injection nozzle 45, and the inside of the injection nozzle 45 is provided with a one-way valve plate.

[0045] By setting the injection pipe 42, slurry can be injected into the two grouting bags 43 in advance, so that the two grouting bags 43 are sealed to form a plugging work of the drill hole. After the two grouting bags 43 are plugged, grouting work is performed inside the casing 41, and the grouting plugging work is performed in cooperation with the plurality of injection nozzles 45;

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

[0047] The directional grouting member 49 is provided to directionally and locally grout the slurry in the casing 41 in a backward manner to seal the cracks in the coal seam, thereby improving the effect of grouting and sealing the cracks in the coal seam and meeting the law of the change of formation stress with depth.

[0048] The invention solves the problem that the sealing device of the prior art using the two-blocking and one-injection method cannot transmit the high-intensity grouting pressure to the small and deep gaps due to the full-range grouting plugging during grouting plugging, and thus cannot grout the small and deep gaps, thus affecting its plugging performance.

[0049] See attached Figures 1 to 4 The injection pipe 42 is arranged inside the sleeve 41, one end of the injection pipe 42 is fixedly connected with the inside of the grouting bag 43 at the initial end, and a pressure explosion valve 46 is installed at one end of the injection pipe 42, and 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, one end of the injection pipe 42 is fixedly connected with an annular frame 47, and the annular frame 47 is fixedly connected with an injection main pipe 48, and a one-way control valve is installed on the injection main pipe 48;

[0050] One end of the injection tube 42 is fixedly connected to the inside of the grouting bag 43 at the initial end position, so that when injecting materials through the injection tube 42, slurry can be directly injected into the grouting bag 43. The two grouting bags 43 are fixedly connected through the drainage tube 44, so that the slurry inside the grouting bag 43 can be discharged to the other grouting bag 43 through the drainage tube 44, so that the two grouting bags 43 are expanded synchronously to form a plugging work;

[0051] The pressure explosion valve 46 adopts the gas explosion valve in the prior art, which is used to form an explosion when the pressure reaches a threshold value, thereby facilitating the injection pipe 42 to inject material into the interior of the casing 41 to form a grouting plugging work;

[0052] The setting of the injection main pipe 48 is used to discharge the prepared slurry into the injection pipe 42, and the sealing work is performed through the injection pipe 42. The setting of the one-way control valve is used to perform one-way control on the injection main pipe 48, thereby avoiding the backflow of the slurry and further improving the stability of the grouting and plugging.

[0053] See attached Figures 1 to 4 The directional grouting member 49 includes a baffle 491 which is slidably sleeved on the outer surface of the gas extraction pipe 1, the outer surface of the baffle 491 is in sealing contact with the inner surface of the sleeve 41, and the baffle 491 is fixedly connected to the injection pipe 42;

[0054] The baffle 491 is provided to separate the interior of the casing 41 into an injection chamber and a chamber to be injected. The baffle 491 is fixedly connected to the injection pipe 42, so that when the injection pressure of the injection chamber reaches a specified range, the pressure explosion valve 46 will explode, and the baffle 491 will move backward, thereby driving the injection pipe 42 to move synchronously in the same direction, and the annular frame 47 can be driven to move synchronously in the same direction. The pressure of the movement of the annular frame 47 is detected by the pressure detection component 5 to understand the grouting pressure;

[0055] There are a plurality of injection nozzles 45, and the plurality of injection nozzles 45 are installed on the outer surface of the sleeve 41 in an equidistant and surrounding manner;

[0056] Attached Figure 1 or Figure 2 The plurality of injection nozzles 45 are divided into five groups, each group of six, and are arranged in an evenly spaced manner. The arrangement can be made according to the actual situation, which not only facilitates the backward fixed-point grouting and plugging work, but also improves the dispersion of the grouting and increases the range of the grouting and plugging;

[0057] The annular frame 47 is installed on the outer surface of the gas extraction pipe 1 in a sliding sleeve manner;

[0058] The annular frame 47 is slidably mounted on the outer surface of the gas extraction pipe 1, so that the annular frame 47 can be guided along the axial direction of the gas extraction pipe 1, thereby improving the orderliness and balance of its movement and further improving the accuracy of its subsequent pressure detection.

[0059] See attached Figure 2 and Figure 3 , the outer surface of the sleeve 41 is connected with 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 drill hole;

[0060] The partition plate 492 is provided to divide the two groups of injection nozzles 45 which are separated from each other, so that during grouting and sealing, a backward grouting operation is performed to form a positioned grouting and sealing operation, thereby further improving the effect of grouting and sealing of coal seam fissures. This solves the problem that in the prior art, when performing two-blocking and one-injection sealing operations, a large-scale grouting operation is directly adopted during grouting and sealing. Due to the large grouting range, the grouting pressure is large, which directly affects the performance of grouting and sealing of the fissures.

[0061] See attached Figure 5 and Figure 6 The pressure detection assembly 5 includes an L-shaped frame 51 installed on the coal mine wall by fastening bolts and a pressure detection plate 52 detachably installed on the annular frame 47. A pressure sensor 53 for detecting the extension pressure of the pressure detection plate 52 is provided on the L-shaped frame 51.

[0062] The pressure detection plate 52 in the pressure detection assembly 5 is fixedly connected to the annular frame 47, so that when the annular frame 47 in the sealing mechanism 4 moves sideways, the pressure detection plate 52 can be driven to move sideways synchronously. The pressure of the lateral movement of the pressure detection plate 52 is detected by the pressure sensor 53, thereby forming the detection work of the plugging grouting pressure.

[0063] Embodiment 2: Based on embodiment 1, the difference is that;

[0064] See attached Figure 5 and Figure 6 A plurality of clamping holes 54 are provided inside the pressure detection plate 52, a movable 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 movable plate 55, and an extrusion spring 57 for pressing the movable plate 55 upward is provided inside the L-shaped frame 51; one side of the latch 56 is provided as an inclined surface, and one side of the inner walls of the plurality of clamping holes 54 are provided as inclined surfaces parallel to one side of the latch 56;

[0065] One side of the latch 56 and the inner wall of the clamp hole 54 are inclined surfaces, and the latch 56 is inserted into the clamp hole 54. As the grouting and plugging pressure of the plugging mechanism 4 gradually increases, the pressure detection plate 52 moves sideways, and the pressure detection plate 52 moves sideways, which can squeeze the latch 56. With the contact of the two inclined surfaces, the latch 56 can move downward.

[0066] When the latch 56 moves downward to completely disengage from the inside of the clamp hole 54, its directional grouting member 49 moves to the next stage of directional grouting position, and the movable plate 55 and the latch 56 are pressed upward by the extrusion spring 57, so that the latch 56 can be inserted into the adjacent clamp hole 54, forming a pressure detection and release operation, which not only has good pressure detection work, but also can automatically release when the pressure reaches the threshold, and perform two-stage pressure detection and release work;

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

[0068] An adjustment plate 58 is slidably connected to one side of the inner wall of the L-shaped frame 51, and both ends of the extrusion spring 57 are respectively fixed between the moving plate 55 and the adjustment plate 58, and the pressure sensor 53 is installed between the extrusion spring 57 and the adjustment plate 58;

[0069] By setting the pressure sensor 53, the pressure of the extrusion spring 57 can be detected, and then the force of the pressure detection plate 52 when it moves sideways can be realized, and finally the force of the plugging grouting can be understood;

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

[0071] By manually controlling the rotation of the bolt rod 59, the position of the adjustment plate 58 can be height-adjusted, and then the initial height of the extrusion spring 57 can be adjusted, thereby achieving the adjustment of the extrusion coefficient of the extrusion spring 57 on the movable plate 55 and the latch 56, thereby meeting the needs of grouting and plugging work of different intensities and improving the diversity of drilling plugging in coal mines.

[0072] Embodiment 3: Based on embodiment 1, the difference is that;

[0073] See attached Figure 4 and Figure 7 The end of the sleeve 41 is fixedly connected with a return pipe 6, one end of the return pipe 6 is connected with the inside of the gas extraction pipe 1, and the other end of the return pipe 6 is fixedly installed with a filter nozzle 7, and one end of the gas extraction pipe 1 is installed with a gas-liquid separation element;

[0074] The setting of the return pipe 6 makes it convenient for the slurry to enter the cracks during grouting and plugging of the coal seam cracks. The gas temporarily stored in the cracks can be discharged to the gas extraction pipe 1 through the return pipe 6 for recycling, thereby increasing the grouting reinforcement effect deep in the coal seam cracks and solving the problem that when the cracks deep in the coal seam have a closed circuit phenomenon, the slurry is not easy to invade, which affects the grouting plugging effect.

[0075] By installing a filter membrane nozzle 7 on the reflux pipe 6, it is convenient to fill the cracks with slurry and fill the space between the two grouting bags 43. The slurry can be separated into solid and liquid through the filter membrane nozzle 7 to reduce the moisture in the slurry, thereby improving the subsequent slurry plugging and solidification efficiency. This solves the problem in the prior art that the slurry needs to flow in a narrow gap, resulting in a large amount of moisture in the slurry, which in turn causes the slurry to be unable to solidify quickly, thereby reducing its sealing performance.

[0076] The gas-liquid separator 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, a drainage 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, and a blocking block 12 is fixedly connected to the bottom of the floating plate 11 through a connecting rod, and the blocking block 12 is used to seal and block the top of the drainage pipe 10;

[0077] The installation of the separation cylinder 9 facilitates the separation of the gas and liquid produced during the early plugging. When the gas and liquid are discharged into the separation cylinder 9 through the gas extraction pipe 1, the separation cylinder 9 is in a sealed state at this time, so that the liquid is stored in the separation cylinder 9, and the gas is discharged into the gas delivery pipeline through the switch valve 2 position for unified delivery.

[0078] When the liquid level inside the separation cylinder 9 rises to the position of the floating plate 11, the floating plate 11 can move upward with the liquid level, and then 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 drainage of the water source stored in the separation cylinder 9. In addition, during the drainage process, there will be no gas leakage. It has good gas-liquid separation and classified drainage functions, further improving the sealing and extraction performance of the fixed-point sealing device, and solving the diversity of 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 can resume the blocking work.

[0080] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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), the outer surface of the sleeve (41) is provided with an injection nozzle (45), and a one-way valve plate is provided inside the injection nozzle (45); A directional grouting piece (49) is provided inside the sleeve (41), and a pressure detection component (5) is installed on the directional grouting piece (49).

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 on 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, one end of the injection pipe (42) is fixedly connected to an annular frame (47), the annular frame (47) is fixedly connected to an injection main pipe (48), 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 2, characterized in that: The pressure detection assembly (5) comprises an L-shaped frame (51) mounted on the wall of a coal mine by fastening bolts, and a pressure detection plate (52) detachably mounted on an annular frame (47), wherein a pressure sensor (53) for detecting the extension pressure of the pressure detection plate (52) is arranged on the L-shaped frame (51).

6. A fixed-point sealing device for drilling holes in coal mines according to claim 5, characterized in that: A plurality of locking holes (54) are provided inside the pressure detection plate (52); a movable plate (55) is slidably connected to one side of the inner wall of the L-shaped frame (51); a latch (56) for inserting into one of the locking holes (54) is fixedly connected to the top of the movable plate (55); and a pressing spring (57) for pressing the movable plate (55) upward is provided 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).

7. 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.

8. A fixed-point sealing device for drilling holes in coal mines according to claim 7, 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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