Hole packer for coal mine

Abstract

The utility model discloses a hole packer for a coal mine, which belongs to the technical field of coal mining and comprises an extraction pipe arranged in a drill hole, the extraction pipe is provided with a plurality of plugging air bags filled with plugging materials, the space between every two plugging air bags is filled with the plugging materials, the inner side surfaces of the plugging air bags are provided with slurry outlet valves, and the slurry outlet valves are communicated with the plugging air bags. A pressurizing bag is arranged in the blocking air bag, a plurality of communicated annular air bags are arranged on the blocking air bag, a cavity is formed between every two annular air bags, holes are formed in the inner sides of the annular air bags, and sheets are arranged at the holes. The pressurizing bag is used for pressurizing the plugging air bag, so that plugging substances in the plugging air bag flow into a drill hole and flow into a newly-added crack under pressure, plugging is carried out for multiple times, and the possibility of air leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mining, in particular to a hole sealer for coal mines. Background Art

[0002] As coal mining depths increase, many mines face the challenge of pre-extraction from high-gas, low-permeability coal seams, a serious obstacle to safe production. Gas extraction is the primary method for addressing gas outbursts and outbursts during mining. However, this process can also present challenges such as low extraction concentration, poor efficiency, and short duration. One of the most significant limitations is the sealing capacity of the borehole, which directly impacts extraction effectiveness.

[0003] After the borehole is sealed, after a period of time, the borehole will deform and crack, causing the sealing device to be unable to make close contact with the coal wall, resulting in air leakage and making the borehole ineffective.

[0004] Therefore, commonly used sealing devices and methods all have defects to varying degrees after the initial sealing, which makes it necessary to improve the sealing device. Utility Model Content

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a coal mine sealer to solve the technical defect that cracks caused by deformation of the drill hole cannot be sealed again.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solution: the utility model provides a coal mine sealer, including an extraction tube arranged in a drill hole, the extraction tube is provided with a plurality of sealing air bags filled with sealing material inside, the space between every two of the sealing air bags is filled with sealing material, a slurry discharge valve is provided on the inner side of the sealing air bag, and a booster bag is provided inside the sealing air bag.

[0007] Preferably, a plurality of interconnected annular airbags are provided on the blocking airbag, a cavity is formed between every two annular airbags, and the inner side of the annular airbags is opened, and a thin sheet is provided at the opening.

[0008] Preferably, the pressurizing bag is an air bag or a water bag, and the corresponding pressurizing bag is connected to the air pump or the water pump through a pipeline.

[0009] Preferably, the blocking material is a sol-like solid material formed by mixing a hydrosol gel with water.

[0010] Preferably, a slurry storage air bag is provided on the extraction tube, and the slurry storage air bag is located between the two blocking air bags.

[0011] Preferably, a water injection airbag is provided in the slurry storage airbag, and the corresponding water injection airbag is connected to a water pump through a water pipe, and a hydrogel is provided between the slurry storage airbag and the water injection airbag.

[0012] Preferably, a plurality of groups of inflatable and deflated cylindrical bags are annularly distributed on the extraction tube.

[0013] Preferably, an elastic rope is provided between every two cylindrical capsules, and magnetic sheets that attract each other are provided on the cylindrical capsules.

[0014] Preferably, a sealing ring is provided at the connection between the blocking airbag and the extraction tube.

[0015] The beneficial effects of the present invention are:

[0016] The utility model pressurizes the blocking airbag through the pressurizing bag, so that the blocking material in the blocking airbag flows into the drill hole and flows into the newly added cracks under pressure, thereby performing multiple blocking operations.

[0017] The utility model fills the cavity with the blocking material in the annular airbag, thereby reducing the possibility of air leakage from the blocking airbag.

[0018] The utility model evenly mixes the hydrosol gel and water by inflating and deflating the cylindrical bag, thereby improving the blocking effect. The inflated cylindrical bag sticks to the inner wall of the drill hole, playing a role of supporting the drill hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of the utility model when it is not working.

[0021] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of the present invention in a non-working state.

[0022] Figure 3 This is a cross-sectional view of the overall structure of the embodiment of the present invention in the working state.

[0023] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of A in the figure.

[0024] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of B.

[0025] Figure 6 It is a schematic diagram of the overall structure of the utility model in working state.

[0026] Explanation of the accompanying symbols: 1-extraction tube, 2-sealing airbag, 3-slurry storage airbag, 4-pressurization bag, 6-cylindrical bag, 7-sealing ring, 21-slurry discharge valve, 22-annular airbag, 23-cavity, 24-thin sheet, 31-water injection airbag, 61-elastic rope, 62-magnetic sheet. DETAILED DESCRIPTION

[0027] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figures 1-6 As shown, this embodiment provides a coal mine sealer, including an extraction pipe 1, which is arranged in a borehole for extracting gas. The extraction pipe 1 is provided with a plurality of sealing air bags 2 filled with sealing material, and the space between every two sealing air bags 2 is filled with sealing material.

[0030] Specifically, the plugging material is a mixture of hydrogel and water. The hydrogel includes, but is not limited to, any one of propylene glycol, sodium carboxymethyl cellulose, and water-soluble urea-formaldehyde resin. When the hydrogel comes into contact with water, it forms a gel-like substance with good pressure resistance, hereinafter referred to as the plugging material. The plugging material penetrates into the cracks surrounding the borehole, effectively improving the sealing performance of the sealing section. The hydrogel also has a certain degree of moisture retention and elasticity. After a period of extraction, it can deform as the borehole deteriorates, maintaining a tight seal against the cracks on the borehole's inner wall.

[0031] like Figure 1 、 Figure 6 As shown, a sealing ring 7 is provided at the connection between the blocking airbag 2 and the extraction tube 1 , and the sealing ring 7 is made of stainless steel.

[0032] like Figure 1 、 Figure 2 、 Figure 4 As shown, a slurry storage air bag 3 is provided on the extraction pipe 1, and the slurry storage air bag 3 is located between the two blocking air bags 2.

[0033] like Figure 2 、 Figure 4As shown, a water-injected airbag 31 is provided in the slurry storage airbag 3. Correspondingly, the water-injected airbag 31 is connected to the water pump through a water pipe. The crushing pressure of the water-injected airbag 31 is less than the crushing pressure of the slurry storage airbag 31. A hydrosol gel is provided between the slurry storage airbag 3 and the water-injected airbag 31.

[0034] Specifically, a one-way valve may be provided at the connection between the water injection airbag 31 and the water pipe to open and close the water injection.

[0035] The water-injected airbag 31 expands by injecting water. When the pressure reaches the expansion limit, the water-injected airbag 31 ruptures. At this time, the water and the hydrosol gel are mixed to form a blocking material. At this time, water continues to be injected into the slurry storage airbag 3. When the expansion limit is reached, the slurry storage airbag 3 ruptures, and the blocking material flows to the crack to block it.

[0036] After a period of sealing, the borehole may deform and crack. Considering that if the newly added cracks are sealed by continuing to inject water and apply pressure, water will enter the cracks before the hydrogel mixture. Excessive water injection into the coal mine borehole will change the physical and mechanical properties of the coal seam, making it softer and increasing the risk of collapse. To this end, this embodiment uses the following structure to perform multiple sealing:

[0037] like Figure 1-Figure 4 As shown, a slurry outlet valve 21 is provided on the inner side of the blocking airbag 2, and a pressurizing bag 4 is provided in the blocking airbag 2. Specifically, the pressurizing bag 4 can be an airbag or a water bag.

[0038] The blocking material is directly filled into the blocking airbag 2, or the blocking material in the blocking airbag 2 is generated in the same manner as that of the slurry storage airbag 3, which will not be described in detail here.

[0039] A pressure sensor is installed on the extraction pipe 1 and connected to an external pressure gauge to monitor the pressure in the borehole between the plugging airbags 2. Staff check the pressure gauge daily. When the pressure is less than 2.5MPa, the booster bag 4 is filled with water or inflated with air. After the booster bag 4 expands, it squeezes the plugging material in the plugging airbags 2 outward. At this time, the slurry discharge valve 21 is opened, and the plugging material flows through the slurry discharge valve 21 into the borehole between the two plugging airbags 2. Under the action of pressure, the plugging material flows into the newly added cracks, performing multiple plugging operations.

[0040] Example 2

[0041] like Figure 3 、 Figure 5 As shown, although the blocking section can block the cracks with the water-soluble gel mixture, there may still be small cracks in the blocking airbag 2 that cannot be blocked. Therefore, this embodiment further improves the blocking airbag 2, specifically:

[0042] A plurality of interconnected annular airbags 22 are provided on the blocking airbag 2, and a cavity 23 is formed between every two annular airbags 22. The inner side of the annular airbag 22 is opened, and a thin sheet 24 is provided at the opening. Specifically, when the pressure in the blocking airbag 2 is greater than 0.8 MPa, the thin sheet 24 falls off from the opening of the annular airbag 22, and the blocking material in the annular airbag 22 fills the cavity 23 and flows into the crack to block it, thereby reducing the possibility of air leakage from the blocking airbag 2.

[0043] Example 3

[0044] like Figure 6 As shown, considering that when the hydrogel is mixed with water, if it is not stirred, the mixing time is too long in a static state, and lumps are easily generated, which affects the sealing effect, therefore, this embodiment is further improved on the basis of the first embodiment, specifically:

[0045] Multiple groups of cylindrical capsules 6 are arranged in a circular pattern on the extraction tube 1, each positioned between two sealing airbags 2. Elastic cords 61 are placed between each pair of cylindrical capsules 6, and magnetic plates 62 are attached to each cylindrical capsule 6 to attract each other. Specifically, when the cylindrical capsules 6 are inflated, the elastic cords 61 remain taut. When the cylindrical capsules 6 are deflated, the elastic cords 61 retract, causing the magnetic plates 62 on adjacent cylindrical capsules 6 to attract each other. Before the extraction tube 1 enters the borehole, the cylindrical capsules 6 adhere to the extraction tube 1 through attraction and are placed within the water-injection airbag 31.

[0046] After repeated stirring, the hydrosol gel mixes with water and becomes viscous, which creates resistance to the return of the cylindrical capsule 6 . At this time, the cylindrical capsule 6 is further inflated until it contacts the inner wall of the borehole.

[0047] The cylindrical capsule 6 is further inflated to play a supporting role and prevent the coal seam at the drill hole from collapsing.

[0048] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A coal mine sealer, comprising a pumping pipe (1) arranged in a borehole, characterized in that: The extraction tube (1) is provided with a plurality of blocking airbags (2) filled with blocking material, the blocking material is filled between every two blocking airbags (2), a slurry outlet valve (21) is provided on the inner side surface of the blocking airbag (2), and a pressurizing bag (4) is provided inside the blocking airbag (2).

2. A coal mine sealer according to claim 1, characterized in that: The blocking airbag (2) is provided with a plurality of interconnected annular airbags (22), a cavity (23) is formed between every two annular airbags (22), and the inner side of the annular airbag (22) is opened, and a thin sheet (24) is provided at the opening.

3. A coal mine sealer according to claim 1, characterized in that: The pressurizing bag (4) is an air bag or a water bag, and the corresponding pressurizing bag (4) is connected to the air pump or the water pump through a pipeline.

4. A coal mine sealer according to claim 1, characterized in that: The blocking material is a sol-like solid material formed by mixing hydrosol gel with water.

5. A coal mine sealer according to claim 1, characterized in that: The extraction pipe (1) is provided with a slurry storage air bag (3), and the slurry storage air bag (3) is located between the two blocking air bags (2).

6. A coal mine sealer according to claim 5, characterized in that: A water injection air bag (31) is provided in the slurry storage air bag (3), and the corresponding water injection air bag (31) is connected to a water pump through a water pipe. A hydrosol gel is provided between the slurry storage air bag (3) and the water injection air bag (31).

7. A coal mine sealer according to claim 1 or 6, characterized in that: A plurality of groups of inflatable and deflated cylindrical bags (6) are arranged in an annular distribution on the extraction tube (1).

8. A coal mine sealer according to claim 7, characterized in that: An elastic rope (61) is provided between each two cylindrical capsules (6), and magnetic sheets (62) that attract each other are provided on the cylindrical capsules (6).

9. A coal mine sealer according to claim 1, characterized in that: A sealing ring (7) is provided at the connection between the blocking airbag (2) and the extraction tube (1).

Images