Hole sealing device for coal mine gas extraction drill hole

Abstract

The utility model belongs to the technical field of coal mine gas extraction, and discloses a hole sealing device for a coal mine gas extraction drill hole, which comprises a sleeve, one end of the sleeve is fixedly connected with a fixing plate, the other end of the sleeve is fixedly connected with an expansion bag, the sleeve is communicated with an inner cavity of the expansion bag, the expansion bag is connected with an air bag, and the air bag is communicated with the fixing plate. An extraction pipe is arranged in the sleeve, a hole is blocked through expansion of the air bag during hole sealing, coal mine gas leakage is prevented, compared with a rubber pad, the structure of the air bag is better attached to the inner wall of the hole, the air bag is matched with the expansion bag, the sealing effect of the hole is enhanced, the tail end of the positioning cone and part of the rod body are wrapped in the rubber ball, and the tip end of the positioning cone is located in the through hole. After concrete grout is injected into the casing pipe, the rubber ball is extruded by the pressure of the concrete grout to deform, so that the tip of the positioning cone is pushed out to be inserted into the inner wall of the hole, the stability of the device in the hole is improved, and position deviation caused by the influence of air pressure is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine gas extraction, in particular to a sealing device for coal mine gas extraction drilling holes. Background Art

[0002] Coal mine gas is the gas generated by plants during the coal formation process, also known as "coalbed methane". It is a mixed gas that escapes from coal and surrounding rocks, and its main component is methane. When underground mining is carried out in coal mines, gas gushes out from the coal seam or rock layer and mixes into the air in the mine. When it reaches a certain concentration, it will explode when it encounters a high-temperature fire source, causing mass casualties. Therefore, gas is called the "number one killer" of coal mine safety, but it is also an efficient and clean energy that can be used as fuel to generate electricity. Coal mine drilling gas extraction technology can not only effectively reduce the amount of gas gushing during mining, prevent gas over-limit and accumulation, prevent gas explosions and coal and gas outburst accidents, but also turn harm into benefit and realize the resource utilization of coalbed methane. Before using drilling to extract gas, it is necessary to use a coal mine gas extraction drilling sealing device to tightly seal the extraction borehole to ensure that the borehole gas will not leak and improve the efficiency of gas extraction.

[0003] A Chinese patent with application number 202321271858.2 discloses a coal mine gas extraction and sealing device, including a casing, a threaded column is connected to the inside of the casing, one end of the threaded column is fixedly connected to a connecting plate, the inner side wall of the connecting plate is fixedly connected to a protrusion, the protrusion is embedded in the inside of an annular groove, and the annular groove is opened on the surface of a rubber pad. By injecting concrete into the injection head, the concrete is transported to the conveying trough through the through groove, and then transported from the conveying trough to the gas hole and the cavity of the casing, and then the push rod is pushed so that the push plate compacts the concrete, and then it presses against the push rod and waits for the concrete to solidify. When the concrete solidifies, the gas hole can be fully blocked, thereby completely sealing the gas extraction hole, thereby effectively preventing gas leakage.

[0004] However, the above-mentioned coal mine gas extraction sealing device has the following problems during actual use: the inner wall of the hole is not smooth, and the rubber pad structure cannot perfectly fit the inner wall of the hole, which is not conducive to the sealing between the casing and the inner wall of the hole.

[0005] Therefore, in order to solve the above problems, a sealing device for coal mine gas extraction drilling holes is proposed. Utility Model Content

[0006] In order to solve the problems raised in the above background technology, the utility model provides a sealing device for coal mine gas extraction drilling holes, which has the advantages of enhancing the sealing performance and stability of the device during sealing.

[0007] To achieve the above object, the utility model provides the following technical solution: A hole sealing device for coal mine gas drainage boreholes, comprising a casing, one end of the casing is fixedly connected with a fixing plate, the other end of the casing is fixedly connected with an expansion bladder, the casing is communicated with the inner cavity of the expansion bladder, the expansion bladder is connected with an airbag, a drainage pipe is arranged in the casing, one end of the drainage pipe penetrates through the fixing plate, and the other end of the drainage pipe penetrates through the expansion bladder and the airbag. A grouting pipe is arranged in the casing, one end of the grouting pipe penetrates through the fixing plate, and the other end is inside the casing. An outlet for grout is arranged at the end of the grouting pipe inside the casing. The casing is provided with evenly distributed positioning cones, the tail ends of the positioning cones are inside the casing, rubber balls are wrapped around the tail ends of the positioning cones, the rubber balls are connected to the inner wall of the casing, and an air guiding pipeline is arranged in the inner wall of the casing. One end of the air guiding pipeline penetrates through the fixing plate, and the other end of the air guiding pipeline penetrates through the expansion bladder and extends into the airbag.

[0008] Preferably, fixing nails are arranged at positions close to the edge of the fixing plate.

[0009] Preferably, a sealing ring is arranged on the side of the fixing plate close to the casing, and the sealing ring is outside the casing.

[0010] Preferably, through holes corresponding to the positioning cones are formed in the casing, and the tips of the positioning cones are inside the through holes.

[0011] Preferably, a pipe joint is connected to one end of the drainage pipe, and an air inlet joint is connected to one end of the air guiding pipeline.

[0012] Preferably, the air guiding pipeline is composed of a bent pipe, an air guiding channel and an extending pipe. The air guiding channel is arranged in the inner wall of the casing, and the two ends of the air guiding channel are respectively connected to the bent pipe and the extending pipe.

[0013] Preferably, slurry outlet holes are formed in the casing at positions close to the expansion bladder.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. By setting structures such as an airbag and an expansion bladder, when sealing the hole, the airbag is first inflated to block the hole to prevent coal mine gas leakage. Compared with a rubber pad, the structure of the airbag fits the inner wall of the hole more closely, and in cooperation with the expansion bladder, the sealing effect of the hole is enhanced.

[0016] 2. By setting the positioning cones and rubber balls, the tail ends and part of the rod bodies of the positioning cones are wrapped in the rubber balls, and their tips are inside the through holes. After injecting concrete slurry into the casing, the rubber balls are deformed by the pressure of the concrete slurry, causing the tips of the positioning cones to be pushed out to insert into the inner wall of the hole, improving the stability of the device in the hole and being not easily displaced due to air pressure. Description of the Drawings

[0017] Figure 1 This is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 This is a schematic diagram of the structure of another angle of the present utility model;

[0019] Figure 3 This is a schematic cross-sectional structure diagram of the casing of the present utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the positioning cone of the present utility model;

[0021] Figure 5 This is a schematic cross-sectional structure diagram of the present utility model. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] As Figures 1 to 5 shown, the present utility model provides a hole sealing device for coal mine gas drainage, including a casing 1. One end of the casing 1 is fixedly connected with a fixing plate 2, and the other end of the casing 1 is fixedly connected with an expansion bag 3. The casing 1 is communicated with the inner cavity of the expansion bag 3. The expansion bag 3 is connected with an air bag 4. A gas extraction pipe 5 is arranged in the casing 1. One end of the gas extraction pipe 5 penetrates through the fixing plate 2, and the other end of the gas extraction pipe 5 penetrates through the expansion bag 3 and is connected with the air bag 4. A grouting pipe 6 is arranged in the casing 1. One end of the grouting pipe 6 penetrates through the fixing plate 2, and the other end is inside the casing 1. An outlet 7 is arranged at one end of the grouting pipe 6 inside the casing 1. The casing 1 is provided with evenly distributed positioning cones 8. The tail end of the positioning cone 8 is inside the casing 1, and a rubber ball 9 is wrapped on the tail end of the positioning cone 8. The rubber ball 9 is connected with the inner wall of the casing 1. A gas guiding pipe 10 is arranged in the inner wall of the casing 1. One end of the gas guiding pipe 10 penetrates through the fixing plate 2, and the other end of the gas guiding pipe 10 penetrates through the expansion bag 3 and extends into the air bag 4. When sealing the hole, first, the air bag 4 is inflated to block the hole to prevent coal mine gas leakage. Compared with a rubber gasket, the structure of the air bag 4 fits the inner wall of the hole better. Cooperating with the expansion bag 3, the sealing effect of the hole is enhanced. The tail end and part of the rod body of the positioning cone 8 are wrapped in the rubber ball 9, and its tip is inside the through hole 13. After injecting concrete slurry into the casing 1, the rubber ball 9 is deformed by the pressure of the concrete slurry, causing the tip of the positioning cone 8 to be pushed out to insert into the inner wall of the hole, improving the stability of the device in the hole and not being easily displaced due to air pressure.

[0024] Specifically, fixing nails 11 are provided at positions near the edge of the fixing plate 2. The fixing nails 11 are used to connect the fixing plate 2 to the coal wall, serving the function of starting the fixing device in the early stage of the hole sealing work.

[0025] Furthermore, a sealing ring 12 is provided on the side of the fixing plate 2 close to the casing 1. The sealing ring 12 is located outside the casing 1. The sealing ring 12 provides a certain sealing effect after the device extends into the hole, preventing a large amount of coal mine gas from leaking when the device seals the hole.

[0026] Still further, a through hole 13 corresponding to the positioning cone 8 is provided on the casing 1. The tip of the positioning cone 8 is located within the through hole 13. The through hole 13 allows the tip of the positioning cone 8 to pass through and restricts the displacement of the positioning cone 8, enabling the positioning cone 8 to extend along the axis of the through hole 13 and insert into the inner wall of the hole.

[0027] It should be noted that one end of the extraction pipe 5 is connected with a pipe joint 14, and one end of the gas guiding pipe 10 is connected with an air inlet joint 15. The pipe joint 14 is connected to the coal mine gas extraction equipment through a pipe, and the air inlet joint 15 is connected to an air injection equipment through a pipe.

[0028] It should be noted that the gas guiding pipe 10 is composed of a bent pipe 1001, a gas guiding channel 1002, and an extending pipe 1003. The gas guiding channel 1002 is arranged in the inner wall of the casing 1. The two ends of the gas guiding channel 1002 are respectively connected to the bent pipe 1001 and the extending pipe 1003. The gas guiding pipe 10 is divided into three parts for convenient processing and manufacturing.

[0029] It is worth introducing that a slurry outlet hole 16 is provided on the casing 1 near the expansion bladder 3. The slurry outlet hole 16 guides the concrete slurry out of the casing 1 for filling and bonding between the casing 1 and the inner wall of the hole, further ensuring the sealing between the casing 1 and the inner wall of the hole.

[0030] Working principle and process: insert one end of the device airbag 4 into the hole. At this time, the fixing plate 2 is outside the hole and is fixed to the coal wall outside the hole by the fixing nail 11. The sealing ring 12 is close to the coal wall outside the hole. The air pump pipeline is connected through the air inlet joint 15, and air is injected through the air pump. The air is injected into the airbag 4 after passing through the air inlet joint 15 and the air guide pipe 10, so that the airbag 4 expands and fits the inner wall of the hole. Compared with the rubber pad, the structure of the airbag 4 fits the inner wall of the hole better and has better sealing. The concrete slurry is injected through the grouting pipe 6 and poured into the casing 1 from the slurry outlet 7. Since the casing 1 is connected to the expansion bag 3 , concrete slurry will be poured into the expansion bag 3, and the expansion bag 3 will expand to form an expansion head after the concrete slurry is poured into the expansion bag 3 to stabilize the device. As the concrete slurry is poured into the casing 1, the pressure generated causes the rubber ball 9 to deform, thereby pushing the positioning cone 8 so that its tip is inserted into the inner wall of the hole to ensure the stability of the device before the concrete slurry solidifies. As the concrete slurry is injected, part of the concrete slurry will be discharged from the slurry outlet hole 16 and filled between the inner wall of the hole and the casing 1, making the device more solid after the concrete slurry solidifies. After the concrete slurry is completely solidified, coal mine gas extraction can be carried out through the extraction pipe 5.

[0031] 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 hole sealing device for a coal mine gas drainage borehole, comprising a casing, characterized in that: One end of the casing is fixedly connected with a fixing plate, and the other end of the casing is fixedly connected with an expansion bladder. The casing is in communication with the inner cavity of the expansion bladder. The expansion bladder is connected with an airbag. A drainage pipe is arranged in the casing. One end of the drainage pipe penetrates through the fixing plate, and the other end of the drainage pipe penetrates through the expansion bladder and the airbag. A grouting pipe is arranged in the casing. One end of the grouting pipe penetrates through the fixing plate, and the other end is inside the casing. An slurry outlet is arranged at the end of the grouting pipe inside the casing. Positioning cones are evenly distributed on the casing. The tail ends of the positioning cones are inside the casing. Rubber balls are wrapped on the tail ends of the positioning cones. The rubber balls are connected to the inner wall of the casing. An air guiding pipeline is arranged in the inner wall of the casing. One end of the air guiding pipeline penetrates through the fixing plate, and the other end of the air guiding pipeline penetrates through the expansion bladder and extends into the airbag.

2. The hole sealing device for a coal mine gas drainage borehole according to claim 1, wherein: Fixing nails are arranged at positions close to the edge of the fixing plate.

3. The hole sealing device for coal mine gas drainage boreholes according to claim 1, characterized in that: A sealing ring is arranged on one side of the fixing plate close to the casing. The sealing ring is outside the casing.

4. The hole sealing device for coal mine gas drainage boreholes according to claim 1, characterized in that: Through holes corresponding to the positioning cones are formed in the casing. The tips of the positioning cones are inside the through holes.

5. The hole sealing device for coal mine gas drainage boreholes according to claim 1, characterized in that: One end of the drainage pipe is connected with a pipe joint, and one end of the air guiding pipeline is connected with an air inlet joint.

6. The hole sealing device for coal mine gas drainage boreholes according to claim 1, characterized in that: The air guiding pipeline is composed of a bent pipe, an air guiding channel and an extending pipe. The air guiding channel is arranged in the inner wall of the casing. The two ends of the air guiding channel are respectively connected with the bent pipe and the extending pipe.

7. The hole sealing device for coal mine gas drainage boreholes according to claim 1, characterized in that: Slurry outlet holes are formed in the casing at positions close to the expansion bladder.

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