Coal mine gas extraction drill hole sealing structure

Abstract

The utility model discloses a coal mine gas extraction drill hole sealing structure, and belongs to the field of coal mine gas extraction. A coal mine gas extraction hole drilling and sealing structure comprises a drainage pipe and two bags installed on the drainage pipe, a second guide pipe is connected to the bag close to one end of a hole opening, a first guide pipe is connected to the bag away from the hole opening, clamping mechanisms are arranged at the two ends of each bag, and each clamping mechanism comprises a clamping plate rotationally connected through a rotary connecting piece; slurry return pipes are further arranged on the clamping plates, a limiting assembly is further arranged between the clamping mechanism and the bag, the limiting assembly comprises end seats which are installed between the clamping plates and the bag and connected with the two clamping plates respectively, a plurality of telescopic rods are arranged on the outer sides of the end seats, and pasting plates connected with the bag are arranged at the outer ends of the telescopic rods; the two ends of the bag are limited through the limiting assemblies, the uniformity of the bag during expansion is kept, the bag is more uniform during expansion, the bag is in closer contact with the wall of a hole channel, and the sealing performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal mine gas extraction, especially to a coal mine gas extraction borehole sealing structure. BACKGROUND

[0002] The "two plugging and one injection" pressure sealing technology is a sealing method for coal mine gas extraction boreholes, and its main purpose is to improve the gas tightness and gas extraction effect by plugging the two ends of the borehole and injecting slurry in the middle.

[0003] According to the search, the patent with the Chinese patent application number 202222478461.2 discloses a coal mine gas extraction borehole sealing structure, which comprises a drainage pipe, a fixing frame for limiting the drainage pipe, two capsules connected to the drainage pipe, a grouting pipe and an expansion material injection pipe slidingly connected to the fixing frame, the fixing frame is fixed with a limiting ring in the direction of the borehole, a supporting ring is arranged on the inner side of the limiting ring, a sliding hole is formed on the fixing frame for the sliding of the grouting pipe and the expansion material injection pipe, the grouting pipe comprises a first grouting pipe and a second grouting pipe, the first grouting pipe and the second grouting pipe are respectively connected to the two capsules, the utility model avoids the inclination of the drainage pipe relative to the borehole, makes the expansion material filler uniform, the fixing frame is provided with a sliding hole to facilitate the completion of filling while the grouting pipe and the expansion material injection pipe are pulled out, and the grouting pipe can ensure the systematic and complete grouting operation of the capsule;

[0004] Although the above-mentioned patent can realize the sealing of the coal mine gas channel, the two ends of the capsule are usually directly fixed on the drainage pipe by iron wire or adhesive tape, but when grouting into the two capsules, there is no limiting at the two ends of the capsule, and the capsule will also expand to the two ends when expanding, resulting in uneven expansion of the capsule and smaller area between the capsule and the channel wall, which affects the sealing effect.

[0005] Therefore, it is urgent to provide a coal mine gas extraction borehole sealing structure to solve the above-mentioned problems. UTILITY MODEL CONTENT

[0006] The utility model aims at solving the problem that the two ends of the capsule lack limiting, resulting in uneven expansion of the capsule and smaller contact area between the capsule and the channel, which affects the sealing effect, and provides a coal mine gas extraction borehole sealing structure.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] The utility model provides a kind of coal mine gas extraction borehole sealing structure, including drainage pipe and two capsules mounted on the drainage pipe, the capsule close to the end of channel mouth is connected with second conduit, the capsule away from channel mouth is connected with first conduit, both ends of the capsule are equipped with clamping mechanism, the clamping mechanism includes the clamping plate of rotation connection by rotation connecting piece, the outside of the clamping plate is equipped with clamping slot, the clamping plate is also equipped with back slurry pipe, limiting assembly is also equipped between the clamping mechanism and the capsule, the limiting assembly includes the end seat of being connected with two clamping plates respectively between the clamping plate and the capsule, the outside of the end seat is equipped with multiple telescopic rods, the outer end of the telescopic rod is equipped with the sticking plate connected with the capsule.

[0009] As the preferred technical solution of the present application, the clamping plate close to the channel mouth is provided with a through hole for the pipeline to pass through.

[0010] As the preferred technical solution of the present application, the drainage pipe between the two capsules is also provided with a liquid distribution capsule.

[0011] As the preferred technical solution of the present application, the liquid distribution capsule is connected with the slurry outlet end of the grouting pipe, and the liquid distribution capsule is uniformly distributed with liquid distribution holes.

[0012] As the preferred technical solution of the present application, both ends of the liquid distribution capsule are provided with mounting ends.

[0013] As the preferred technical solution of the present application, the back slurry port of the back slurry pipe is located between the two capsules and is provided with a backflow head, one end of the backflow head is connected with the back slurry port of the back slurry pipe through a connecting pipe.

[0014] As the preferred technical solution of the present application, the other end of the backflow head is provided with a plug column, which is inserted into the clamping plate away from the channel mouth.

[0015] As the preferred technical solution of the present application, a plurality of liquid inlet holes for back slurry are formed in the backflow head.

[0016] Compared with the prior art, the coal mine gas extraction borehole sealing structure has the following beneficial effects:

[0017] 1、The coal mine gas extraction borehole sealing structure, by setting limiting assembly at both ends of the capsule, realizes limiting both ends of the capsule through limiting assembly, maintains the uniformity of the capsule when swelling, is more uniform when swelling, and is more closely contacted with the channel wall, improves the sealing performance, solves the problem that the capsule expands to both ends when swelling in the prior art, which leads to poor uniformity when swelling, reduces the contact area of the capsule and the channel wall, and affects the sealing performance.

[0018] 2. The coal mine gas extraction drilling hole sealing structure, through the clamping mechanism, realizes the fixing of the two ends of the bag on the drainage pipe, can conveniently adjust the position of the bag and the distance between the two bags, is more stable during fixing, and will not damage the drainage pipe, solves the problem that the existing technology is easy to damage the drainage pipe when fixing the two ends of the bag through screws.

[0019] 3. The coal mine gas extraction drilling hole sealing structure, through the liquid distribution bag, realizes that when the slurry is injected, the slurry flows out through the liquid distribution holes on the liquid distribution bag, improves the uniformity of the slurry flow, is more uniform and stable when sealing the gap around the hole, improves the sealing effect, solves the problem that the existing technology is single in the slurry outlet of the grouting pipe, the slurry outlet position is single, and the slurry is not uniformly distributed when grouting, which affects the sealing effect of the hole gap. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole structure schematic view of the utility model;

[0021] Figure 2 It is a bag structure schematic view of the utility model;

[0022] Figure 3 It is a clamping mechanism structure schematic view of the utility model;

[0023] Figure 4 It is a liquid distribution bag structure schematic view of the utility model;

[0024] Figure 5 It is a reflux head structure schematic view of the utility model.

[0025] In the drawing:

[0026] 1, first conduit; 2, slurry return pipe; 3, grouting pipe; 4, second conduit; 5, drainage pipe; 6, clamping plate; 7, end seat; 8, telescopic rod; 9, bag; 10, liquid distribution bag; 11, reflux head; 12, rotary connecting piece; 13, clamping groove; 14, sticking plate; 15, mounting end; 16, liquid distribution hole; 17, connecting pipe; 18, liquid inlet hole; 19, insertion column. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments; Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] Embodiment:

[0029] Referring to Figures 1-5 A coal mine gas extraction drilling hole sealing structure, comprising a drainage pipe 5 and a bag 9 installed on the drainage pipe 5, in use, by injecting slurry or foaming material into the drainage pipe 5, the bag 9 is inflated to seal the hole, wherein the bag 9 is provided with two, and the two bags 9 are sealed, and slurry is injected into the two bags 9 through the grouting pipe 3 to fill and seal the hole and the cracks around the hole, which is beneficial to improve the drainage concentration of the drilling hole and slow down the attenuation speed; the bag 9 close to one end of the hole opening is connected with a second conduit 4, and the bag 9 away from the hole opening is connected with a first conduit 1, and the clamping plate 6 close to the hole opening is provided with a through hole for the pipeline to pass through, and the clamping plate 6 can support the pipeline, and the clamping plate 6 is also provided with a slurry return pipe 2, and the slurry return port of the slurry return pipe 2 is located between the two bags 9 and is provided with a return head 11.

[0030] Referring to Figure 1 And Figure 4 Further, the drainage pipe 5 between the two bags 9 is also provided with a liquid distribution bag 10, the liquid distribution bag 10 is connected with the slurry outlet end of the grouting pipe 3, the liquid distribution bag 10 is uniformly distributed with liquid distribution holes 16, in grouting, the slurry is pre-injected into the liquid distribution bag 10 to inflate the liquid distribution bag 10, the internal slurry flows out through the liquid distribution holes 16 on the liquid distribution bag 10 to seal the hole, the liquid distribution bag 10 can effectively maintain the stability of the flowing slurry, and the slurry is distributed to multiple positions of the hole to improve the sealing effect of the cracks around the hole; both ends of the liquid distribution bag 10 are provided with mounting ends 15, which can be connected and fixed with the drainage pipe 5 by means of adhesive tape and wire during installation to maintain the stability of the liquid distribution bag 10 during use.

[0031] Referring to Figures 1-3 Further, both ends of the bag 9 are provided with clamping mechanisms, the bag 9 is installed on the drainage pipe 5 through the clamping mechanisms, the installation operation is convenient, the distance between the two bags 9 and the position on the drainage pipe 5 can be adjusted according to needs, and the use is more convenient;

[0032] The clamping mechanism comprises a clamping plate 6 connected by a rotary connecting piece 12, the outer side of the clamping plate 6 is provided with a clamping groove 13, the clamping plate 6 can be conveniently clamped and fixed by the clamping groove 13 during installation, the clamping plate 6 is clamped and fixed on the drainage pipe 5, the clamping mechanism is relatively fixed by a screw, and the drainage pipe 5 can be better protected; the rotary connecting piece 12 comprises an end seat installed on one of the clamping plates 6 and a rotary seat installed on the other clamping plate 6, both ends of the rotary seat are provided with rotary shafts rotatably connected with the end seat, the clamping plate 6 connected by the rotary connecting piece 12 can better adapt to the drainage pipe 5, and the clamping is more stable;

[0033] The limiting assembly can limit the two ends of the bag 9, so that the two ends of the bag 9 can reduce the expansion to the two ends under the action of the limiting assembly when the bag 9 is inflated, the side surface of the bag 9 can be more closely contacted with the hole, and the sealing effect is improved; the limiting assembly comprises an end seat 7 installed between the clamping plate 6 and the bag 9, wherein the end seat 7 is provided with two end seats 7 and is connected with the two clamping plates 6, respectively, a plurality of telescopic rods 8 are arranged on the outer side of the end seat 7, the outer end of the telescopic rod 8 is provided with a sticking plate 14, and the telescopic rod 8 is bonded to the end surface of the bag 9 through the sticking plate 14; when the bag 9 is inflated, the telescopic rod 8 is elongated, wherein the sticking position of the sticking plate 14 is the same end surface of the bag 9 after the telescopic rod 8 is elongated to the longest position, the limiting area of the end surface of the bag 9 can be improved when the telescopic rod 8 is limited, and the inflation is more uniform, and the sealing effect on the hole is improved.

[0034] Referring to Figure 1 And Figure 5 Further, one end of the return flow head 11 is connected with the return slurry port of the slurry return pipe 2 through the connecting pipe 17, the other end of the return flow head 11 is provided with a plug column 19, the plug column 19 is inserted into the clamping plate 6 away from the hole port, the return slurry position of the slurry return pipe 2 can be fixed, and the stability during return slurry is maintained; a plurality of liquid inlet holes 18 for return slurry are formed in the return flow head 11.

[0035] Specifically, when the coal mine gas extraction borehole sealing structure is in operation / used, the device is inserted into the hole, then slurry or foaming material is injected into the two bags 9 through the first conduit 1 and the second conduit 4, the bags 9 are inflated, the two ends of the bags 9 are limited by the limiting assembly during the inflation process, the bags 9 seal the hole, after the sealing is completed, the slurry pump injects slurry into the liquid distribution bag 10 through the slurry pipe 3, the liquid distribution bag 10 is inflated, and the slurry is distributed in the area between the two bags 9 through the liquid distribution hole 16 of the liquid distribution bag 10, the hole and the gap around the hole are filled with the slurry, the slurry injection is stopped when the slurry pump reaches the specified pressure, and the hole is sealed.

[0036] The above merely describes a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A coal mine gas extraction borehole sealing structure, comprising an extraction pipe (5) and two capsules (9) installed on the extraction pipe (5), characterized in that, The second conduit (4) is connected to the bag (9) near the hole, the first conduit (1) is connected to the bag (9) far from the hole, both ends of the bag (9) are provided with clamping mechanisms, the clamping mechanism comprises a clamping plate (6) connected by a rotating connecting piece (12), a clamping plate (6) is provided with a clamping groove (13) on the outside, the clamping plate (6) is further provided with a back slurry pipe (2), the clamping mechanism and the bag (9) are further provided with a limiting assembly, the limiting assembly comprises an end seat (7) connected with two clamping plates (6) and installed between the clamping plate (6) and the bag (9), the end seat (7) is provided with a plurality of telescopic rods (8) on the outside, the outer end of the telescopic rod (8) is provided with a sticking plate (14) connected with the bag (9).

2. The coal mine gas extraction borehole sealing structure according to claim 1, characterized in that, The clamping plate (6) near the hole is provided with a through hole for the pipeline to pass through.

3. The coal mine gas extraction borehole sealing structure according to claim 1, characterized in that, The back slurry pipe (5) is further provided with a liquid distribution bag (10) between the two bags (9).

4. The coal mine gas extraction borehole sealing structure according to claim 3, characterized in that, The liquid distribution bag (10) is connected with the slurry outlet end of the grouting pipe (3), and the liquid distribution bag (10) is uniformly provided with liquid distribution holes (16).

5. The coal mine gas extraction borehole sealing structure according to claim 3, characterized in that, Both ends of the liquid distribution bag (10) are provided with mounting ends (15).

6. The coal mine gas extraction borehole sealing structure according to claim 1, characterized in that, The back slurry port of the back slurry pipe (2) is located between the two bags (9) and is provided with a backflow head (11), one end of the backflow head (11) is connected with the back slurry port of the back slurry pipe (2) through a connecting pipe (17).

7. The coal mine gas extraction borehole sealing structure according to claim 6, characterized in that, The other end of the backflow head (11) is provided with a plug column (19), and the plug column (19) is inserted into the clamping plate (6) far from the hole.

8. The coal mine gas extraction borehole sealing structure according to claim 7, characterized in that, The backflow head (11) is provided with a plurality of liquid inlet holes (18) for back slurry.

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