CN221220543U - Colliery prevents pressure release backward flow hole sealing device - Google Patents

Abstract

The utility model provides a device for preventing pressure relief and backflow of a hole in a coal mine, which comprises: the water injection mechanism extends into the drill hole and is provided with a water inlet and a water outlet which are communicated with each other, and the water injection mechanism is used for injecting water into the drill hole; the hole sealing mechanism comprises a communicating part and a blocking part which are communicated with each other, the blocking part is sleeved on the water injection mechanism and is connected with the outer wall of the water injection mechanism, the pressing mechanism is located outside a drilled hole and is communicated with the communicating part, and the pressing mechanism is used for injecting pressure water into the communicating part so that the drilled hole is blocked after the blocking part expands. By adopting the scheme, the water injection mechanism is not communicated with the hole sealing mechanism and the flow channel of the pressurizing mechanism, so that the water injection and pressurizing processes in the drilled hole are not mutually influenced. By means of the pressure relief backflow prevention hole sealing device for the coal mine, holes can be drilled and sealed on coal beds of different types effectively, and better gas extraction effect can be achieved.

Description

Colliery prevents pressure release backward flow hole sealing device

Technical Field

The utility model relates to the technical field of coal mine safety, in particular to a pressure relief backflow prevention hole sealing device for a coal mine.

Background

Gas is one of the main disasters causing coal mine production accidents. When the gas concentration in the air is high, the oxygen content in the air can be relatively reduced, and the suffocation condition of personnel can be caused; and when the gas content in the air reaches a certain value, the gas can burn or explode when meeting fire. The explosion of the gas can generate a large amount of toxic and harmful gases, the oxygen content is reduced, and the harmful gases such as carbon monoxide, carbon dioxide and the like are obviously increased, so that a large amount of personnel poisoning casualties can be caused.

In the prior art, the coal-seam gas extraction technology is generally adopted to solve the problem of coal-seam gas, the water injection hole sealing device plays an important role in coal-seam safety exploitation as commonly used equipment of coal mines, after coal-seam water injection, partial gas can be diluted, the gas concentration is reduced, the ground stress and the gas pressure are reduced, dust can be effectively reduced, but the existing rubber water injection hole sealing device adopted by the existing coal mines is low in efficiency, hole sealing material steel pipes cannot be recovered, the hole sealing device leaks into holes along with water injection flow for hours, and the like, so that the existing coal-seam extraction efficiency is low.

Disclosure of utility model

The utility model provides a coal mine pressure relief backflow prevention hole sealing device, which at least solves the problem that the hole sealing device can leak into a drill hole when the water injection flow in the drill hole is small in the prior art.

In order to solve the problems, the utility model provides a pressure relief backflow prevention hole sealing device for a coal mine, which comprises: the water injection mechanism extends into the drill hole and is provided with a water inlet and a water outlet which are communicated with each other, and the water injection mechanism is used for injecting water into the drill hole; the hole sealing mechanism comprises a communicating part and a blocking part which are communicated with each other, the blocking part is sleeved on the water injection mechanism and is connected with the outer wall of the water injection mechanism, the pressing mechanism is located outside a drilled hole and is communicated with the communicating part, and the pressing mechanism is used for injecting pressure water into the communicating part so that the drilled hole is blocked after the blocking part expands.

Further, the pressing mechanism comprises a pressing part and a pressure stabilizing part, the pressing part is provided with a pressing inlet and a pressing outlet which are mutually communicated, the pressure stabilizing part is detachably arranged at the pressing inlet, the pressing outlet is communicated with the communicating part, the pressing mechanism is provided with a pressing working condition and a pressure stabilizing working condition, the pressure stabilizing part avoids the pressing inlet under the pressing working condition, and the pressure stabilizing part seals the pressing inlet under the pressure stabilizing working condition.

Further, the steady voltage portion is locking lock nut, and the portion of beating includes the pipeline of beating and connecting piece of mutual intercommunication, and the connecting piece has the entry of beating, and the pipeline of beating has the export of beating, and pipeline and the intercommunication portion intercommunication of beating, locking lock nut detachably set up on the connecting piece, under the operating mode of beating, locking lock nut and connecting piece disconnection to dodge and beat the entry, under the operating mode of steady voltage, locking lock nut and connecting piece are connected, in order to seal and beat the entry.

Further, the connecting piece includes shell, self-sealing core and elastic component, and the shell is with the pipeline intercommunication of beating, and the one end of elastic component and the inner wall connection of shell, the other end and the self-sealing core of elastic component are connected, and locking lock is female to be dismantled with self-sealing core and be connected, under beating the operating mode, locking lock is female to be disconnected with self-sealing core to dodge and beat the entry, under steady voltage operating mode, locking lock is female to be connected with self-sealing core, and the elastic component is compressed, in order to seal to beat the entry.

Further, the self-sealing core comprises a first block body and a second block body, the first block body is connected with the other end of the elastic piece, the second block body is of a conical structure, one large end of the second block body is connected with the first block body, and the second block body is connected with the locking nut in a threaded mode.

Further, the communication part is an expansion pipeline, the blocking part is an expansion capsule, one end of the expansion pipeline is communicated with the pressurizing mechanism, the expansion capsule is sleeved on the water injection mechanism and is connected with the outer wall of the water injection mechanism, and the pressurizing mechanism is used for injecting pressurized water into the expansion pipeline so as to block a drilled hole after the expansion capsule is expanded.

Further, the expansion pipeline comprises a first pipe section, a second pipe section and a third pipe section which are communicated in sequence, the second pipe section is perpendicular to the first pipe section and the third pipe section, the first pipe section is communicated with the pressurizing mechanism, and the third pipe section is communicated with the expansion capsule.

Further, the water injection mechanism is a water injection pipe, one end of the water injection pipe is a water inlet, the other end of the water injection pipe is a water outlet, the water injection pipe is inserted into a drill hole, the hole sealing mechanism is sleeved on the water injection pipe, and the water injection pipe is used for injecting water into the drill hole.

Further, the coal mine pressure relief backflow prevention hole sealing device further comprises a check valve, and the check valve is arranged at the water outlet.

Further, the coal mine pressure relief backflow prevention hole sealing device further comprises a flowmeter, the flowmeter is arranged at the water inlet, and the flowmeter is used for monitoring the water inflow of the water inlet.

The technical scheme of the utility model provides a pressure release and backflow prevention hole sealing device for a coal mine, which comprises the following components: the water injection mechanism extends into the drill hole and is provided with a water inlet and a water outlet which are communicated with each other, and the water injection mechanism is used for injecting water into the drill hole; the hole sealing mechanism comprises a communicating part and a blocking part which are communicated with each other, the blocking part is sleeved on the water injection mechanism and is connected with the outer wall of the water injection mechanism, the pressing mechanism is located outside a drilled hole and is communicated with the communicating part, and the pressing mechanism is used for injecting pressure water into the communicating part so that the drilled hole is blocked after the blocking part expands. By adopting the scheme, the water injection mechanism is not communicated with the hole sealing mechanism and the flow channel of the pressing mechanism, so that the water injection and pressing processes in the drill hole are not mutually influenced, when the water injection mechanism stops water injection, the pressure relief backflow hole sealing device is prevented from being subjected to outward expansion pressure in the coal mine, water backflow is prevented from being caused from a water outlet, the hole sealing device is prevented from leaking into the drill hole, and the problem that the hole sealing device can leak into the drill hole when the water injection flow in the drill hole is small in the prior art is effectively solved. By means of the pressure relief backflow prevention hole sealing device for the coal mine, holes can be drilled and sealed on coal beds of different types effectively, and better gas extraction effect can be achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

Fig. 1 shows a schematic structural diagram of a water injection mechanism and a hole sealing mechanism provided by an embodiment of the present utility model;

fig. 2 shows a schematic structural diagram of a pressing mechanism according to an embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

10. A water injection mechanism; 11. a water inlet; 12. a water outlet;

20. A hole sealing mechanism; 21. a communication section; 211. a first pipe section; 212. a second pipe section; 213. a third pipe section; 22. a blocking part;

30. A pressing mechanism; 31. a pressing part; 311. pressing the inlet; 312. pressing the outlet; 313. pressurizing the pipeline; 314. a connecting piece; 3141. a housing; 3142. self-sealing core; 3143. an elastic member; 3145. a first block; 3146. a second block; 32. a voltage stabilizing section;

40. A check valve;

50. A flow meter.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 2, an embodiment of the present utility model provides a pressure release and backflow prevention hole sealing device for a coal mine, including: the water injection mechanism 10 extends into the drill hole, the water injection mechanism 10 is provided with a water inlet 11 and a water outlet 12 which are communicated with each other, and the water injection mechanism 10 is used for injecting water into the drill hole; the hole sealing mechanism 20 and the pressing mechanism 30, the hole sealing mechanism 20 comprises a communicating part 21 and a blocking part 22 which are communicated with each other, the blocking part 22 is sleeved on the water injection mechanism 10 and is connected with the outer wall of the water injection mechanism 10, the pressing mechanism 30 is located outside a drilled hole, the pressing mechanism 30 is communicated with the communicating part 21, and the pressing mechanism 30 is used for injecting pressurized water into the communicating part 21 so as to enable the blocking part 22 to block the drilled hole after being expanded.

By adopting the scheme, the water injection mechanism 10 is not communicated with the hole sealing mechanism 20 and the flow channels of the pressing mechanism 30, so that the water injection and pressing processes in the drilled holes are not mutually influenced, when the water injection mechanism 10 stops water injection, the pressure relief backflow prevention hole sealing device for the coal mine has no outward expansion pressure, so that water backflow is prevented from the water outlet 12, the hole sealing device is prevented from leaking into the drilled holes, and the problem that the hole sealing device can leak into the drilled holes when the water injection flow in the drilled holes is small in the prior art is effectively solved. By means of the pressure relief backflow prevention hole sealing device for the coal mine, holes can be drilled and sealed on coal beds of different types effectively, and better gas extraction effect can be achieved.

The pressing mechanism 30 includes a pressing portion 31 and a pressure stabilizing portion 32, the pressing portion 31 includes a pressing inlet 311 and a pressing outlet 312 which are mutually communicated, the pressure stabilizing portion 32 is detachably disposed at the pressing inlet 311, the pressing outlet 312 is communicated with the communicating portion 21, the pressing mechanism 30 includes a pressing working condition and a pressure stabilizing working condition, the pressure stabilizing portion 32 avoids the pressing inlet 311 under the pressing working condition, and the pressure stabilizing portion 32 seals the pressing inlet 311 under the pressure stabilizing working condition.

The arrangement is that under the pressing working condition, the pressure stabilizing part 32 is disconnected from the pressing part 31, so that the purpose of avoiding the pressing inlet 311 is realized, and pressurized water is conveniently injected into the hole sealing mechanism 20; under the pressure stabilizing working condition, the pressure stabilizing part 32 is connected with the pressing part 31, so that the purpose of blocking the pressing inlet 311 is realized, and the pressure injected into the hole sealing mechanism 20 is prevented from leaking.

Further, the pressure stabilizing portion 32 is a locking nut, the pressing portion 31 includes a pressing pipe 313 and a connecting piece 314 which are mutually communicated, the connecting piece 314 has a pressing inlet 311, the pressing pipe 313 has a pressing outlet 312, the pressing pipe 313 is communicated with the communicating portion 21, the locking nut is detachably arranged on the connecting piece 314, under the pressing working condition, the locking nut is disconnected from the connecting piece 314 so as to avoid the pressing inlet 311, and under the pressure stabilizing working condition, the locking nut is connected with the connecting piece 314 so as to seal the pressing inlet 311.

By adopting the arrangement mode, the locking lock nut is detachably arranged on the connecting piece 314, so that the locking lock nut can be disconnected with the connecting piece 314 under the pressing working condition, the pressing inlet 311 is avoided, and the pressing is convenient; under the pressure stabilizing working condition, the locking lock nut can be connected with the connecting piece 314, so that the pressurizing inlet 311 is blocked, and the pressurized water injected into the hole sealing mechanism 20 is prevented from leaking.

In this embodiment, the connector 314 includes a housing 3141, a self-sealing core 3142 and an elastic member 3143, the housing 3141 is communicated with the pressing pipe 313, one end of the elastic member 3143 is connected with the inner wall of the housing 3141, the other end of the elastic member 3143 is connected with the self-sealing core 3142, the locking nut is detachably connected with the self-sealing core 3142, under the pressing condition, the locking nut is disconnected with the self-sealing core 3142 to avoid the pressing inlet 311, under the pressure stabilizing condition, the locking nut is connected with the self-sealing core 3142, and the elastic member 3143 is compressed to seal the pressing inlet 311.

In this way, the self-sealing core 3142 and the elastic member 3143 are arranged, under the pressing working condition, the locking lock nut is disconnected from the self-sealing core 3142, the elastic member 3143 is in a relaxed state, the self-sealing core 3142 does not seal the pressing inlet 311, so that water pressure can reach the pressing outlet 312 from the pressing inlet 311, after the pressing is finished, namely under the pressure stabilizing working condition, the locking nut is screwed, the locking nut is connected with the self-sealing core 3142 through threads, and at the moment, the elastic member 3143 is in a compressed state, so that the self-sealing core 3142 seals the pressing inlet 311, and pressure leakage is prevented. Wherein the elastic member 3143 is a spring.

Specifically, the self-sealing core 3142 includes a first block 3145 and a second block 3146, the first block 3145 is connected to the other end of the elastic member 3143, the second block 3146 is in a tapered structure, one end of the second block 3146 having a large size is connected to the first block 3145, and the second block 3146 is screwed to the lock nut.

The second block 3146 is provided in a tapered configuration to facilitate threaded engagement with the lock nut.

In this scheme, as shown in fig. 1 and 2, the communicating portion 21 is an expansion pipe, the blocking portion 22 is an expansion capsule, one end of the expansion pipe is communicated with the pressurizing mechanism 30, the expansion capsule is sleeved on the water injection mechanism 10 and is connected with the outer wall of the water injection mechanism 10, and the pressurizing mechanism 30 is used for injecting pressurized water into the expansion pipe so as to block the drilled hole after the expansion capsule is expanded.

In this way, the plugging portion 22 is set to be an expansion capsule, so that the pressurizing mechanism 30 injects pressurized water into the expansion capsule after injecting pressurized water into the expansion pipe, and the expansion capsule is expanded, thereby achieving the purpose of plugging the drilled hole.

Wherein, the material of the expansion capsule is wear-resistant and pressure-resistant expansion material.

The expansion pipeline comprises a first pipe section 211, a second pipe section 212 and a third pipe section 213 which are communicated in sequence, the second pipe section 212 is perpendicular to the first pipe section 211 and the third pipe section 213, the first pipe section 211 is communicated with the pressing mechanism 30, and the third pipe section 213 is communicated with the expansion capsule.

In this way, the pressurized water entering from the pressurizing mechanism 30 passes through the first pipe section 211, the second pipe section 212 and the third pipe section 213, and finally enters the expansion capsule, thereby playing a role of buffering.

In this embodiment, the water injection mechanism 10 is a water injection pipe, one end of the water injection pipe is a water inlet 11, the other end of the water injection pipe is a water outlet 12, the water injection pipe is inserted into a borehole, the hole sealing mechanism 20 is sleeved on the water injection pipe, and the water injection pipe is used for injecting water into the borehole.

So set up, be convenient for like this through the water injection pipe to the drilling in water injection.

Specifically, the coal mine pressure relief backflow prevention hole sealing device further comprises a check valve 40, and the check valve 40 is installed at the water outlet 12.

By installing the check valve 40 at the water outlet 12, water flow from the water outlet 12 into the water injection pipe again can be prevented, resulting in backflow of the water injection.

In this embodiment, the device for preventing pressure relief and backflow of the coal mine further comprises a flowmeter 50, the flowmeter 50 is installed at the water inlet 11, and the flowmeter 50 is used for monitoring the inflow of water into the water inlet 11.

The flowmeter 50 is arranged, so that the inflow of water into the water inlet 11 can be monitored in real time.

The operation principle of the coal mine pressure relief backflow prevention hole sealing device in the scheme is as follows:

Step one: the water injection mechanism is placed in the drill hole, water is injected into the water inlet, water flows through the water injection channel, finally enters the drill hole through the water outlet, water injection is stopped when the water injection flow reaches the preset flow parameter through monitoring of the flowmeter, and the check valve prevents water flow from reentering the water injection mechanism.

Step two: the water pressure enters from the pressing inlet, the pressing outlet outputs water to enter the communicating part, the locking nut is screwed down after being pressed to ensure that the hole sealing pressure can not leak, the self-sealing core is in threaded connection with the locking nut, the water pressure can be sealed, and the elastic piece can ensure that the water pressure is locked before the pressing connection is removed. In the pressing process, the lock nut and the elastic piece are in a loosening state, the self-sealing core does not seal the pressing inlet, so that water pressure can reach the pressing outlet from the pressing inlet, but after the pressing is finished, the lock nut is screwed down, the lock nut is connected with the self-sealing core through threads, and the elastic piece is in a compression state at the moment, so that the self-sealing core seals the pressing inlet, and pressure leakage is prevented.

Step three: the water pressure enters the communicating part through the pressing outlet, the water pressure enters the expansion capsule through the expansion channel, the expansion capsule is continuously expanded along with the gradual increase of the water pressure, and finally the expansion capsule seals the drilling hole, so that the final effect is achieved.

The advantages of this scheme are as follows:

The pressure relief backflow prevention hole sealing device for the coal mine is suitable for coal seam drilling hole sealing, such as coal seam pressure measurement drilling, rock roadway ascending drilling, descending drilling, gas extraction hole sealing of various drilling holes such as coal seam drilling and the like. According to the scheme, the water injection mechanism and the pressing mechanism are separated from each other, through the improvement, according to a predesigned gas extraction scheme, when water injection fracturing and gas extraction are stopped, the pressure relief backflow hole sealing device for preventing the coal mine is not continuously expanded outwards, the check valve can prevent water flow from flowing into the pressure relief backflow hole sealing device for preventing the coal mine from flowing into the water injection port again, and the pressing mechanism can prevent pressure leakage. Compared with a coal mine hole packer which cannot prevent pressure relief, the pressure relief backflow hole packer can prevent the problem of water injection backflow and pressure leakage caused by insufficient water pressure according to different gas concentrations, effectively seal holes on coal beds with different gas concentrations, and achieve better gas extraction effects.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides a colliery prevents pressure release backward flow hole sealing device which characterized in that includes:

The water injection mechanism (10) stretches into the drilling hole, the water injection mechanism (10) is provided with a water inlet (11) and a water outlet (12) which are communicated with each other, and the water injection mechanism (10) is used for injecting water into the drilling hole;

Hole sealing mechanism (20) and beat and press mechanism (30), hole sealing mechanism (20) are including intercommunication portion (21) and shutoff portion (22) of mutual intercommunication, shutoff portion (22) cover is established on water injection mechanism (10), and with the outer wall connection of water injection mechanism (10), it is located to beat pressing mechanism (30) outside the drilling, beat pressing mechanism (30) with intercommunication portion (21) intercommunication, beat pressing mechanism (30) be used for to intercommunication portion (21) injection pressure water, so that shutoff portion (22) are shutoff after inflation drilling.

2. The pressure relief backflow prevention hole sealing device for the coal mine according to claim 1, wherein the pressure relief mechanism (30) comprises a pressure relief part (31) and a pressure stabilizing part (32), the pressure relief part (31) is provided with a pressure relief inlet (311) and a pressure relief outlet (312) which are communicated with each other, the pressure stabilizing part (32) is detachably arranged at the pressure relief inlet (311), the pressure relief outlet (312) is communicated with the communication part (21), the pressure relief mechanism (30) is provided with a pressure relief working condition and a pressure stabilizing working condition, the pressure stabilizing part (32) avoids the pressure relief inlet (311) under the pressure relief working condition, and the pressure stabilizing part (32) is used for blocking the pressure relief inlet (311) under the pressure stabilizing working condition.

3. The pressure relief backflow prevention hole sealing device for coal mines according to claim 2, wherein the pressure stabilizing portion (32) is a locking nut, the pressing portion (31) comprises a pressing pipeline (313) and a connecting piece (314) which are communicated with each other, the connecting piece (314) is provided with the pressing inlet (311), the pressing pipeline (313) is provided with the pressing outlet (312), the pressing pipeline (313) is communicated with the communicating portion (21), the locking nut is detachably arranged on the connecting piece (314), and under the pressing working condition, the locking nut and the connecting piece (314) are disconnected to avoid the pressing inlet (311), and under the pressure stabilizing working condition, the locking nut and the connecting piece (314) are connected to block the pressing inlet (311).

4. The pressure release backflow prevention hole sealing device for a coal mine according to claim 3, wherein the connecting piece (314) comprises a shell (3141), a self-sealing core (3142) and an elastic piece (3143), the shell (3141) is communicated with the pressurizing pipe (313), one end of the elastic piece (3143) is connected with the inner wall of the shell (3141), the other end of the elastic piece (3143) is connected with the self-sealing core (3142), the locking nut is detachably connected with the self-sealing core (3142), the locking nut is disconnected with the self-sealing core (3142) under the pressurizing working condition so as to avoid the pressurizing inlet (311), the locking nut is connected with the self-sealing core (3142) under the pressure stabilizing working condition, and the elastic piece (3143) is compressed so as to seal the pressurizing inlet (311).

5. The device for sealing a hole in a coal mine under pressure relief and backflow prevention according to claim 4, wherein the self-sealing core (3142) comprises a first block (3145) and a second block (3146), the first block (3145) is connected with the other end of the elastic member (3143), the second block (3146) is in a conical structure, one large-sized end of the second block (3146) is connected with the first block (3145), and the second block (3146) is in threaded connection with the locking nut.

6. The pressure relief backflow prevention hole sealing device for the coal mine according to claim 1, wherein the communicating part (21) is an expansion pipeline, the blocking part (22) is an expansion capsule, one end of the expansion pipeline is communicated with the expansion capsule, one end of the expansion pipeline is communicated with a pressing mechanism (30), the expansion capsule is sleeved on the water injection mechanism (10) and is connected with the outer wall of the water injection mechanism (10), and the pressing mechanism (30) is used for injecting pressure water into the expansion pipeline so as to enable the expansion capsule to block the drilling after being expanded.

7. The pressure relief backflow prevention hole sealing device for the coal mine according to claim 6, wherein the expansion pipeline comprises a first pipe section (211), a second pipe section (212) and a third pipe section (213) which are communicated in sequence, the second pipe section (212) is perpendicular to the first pipe section (211) and the third pipe section (213), the first pipe section (211) is communicated with the pressurizing mechanism (30), and the third pipe section (213) is communicated with the expansion capsule.

8. The device for sealing the hole of the pressure relief backflow prevention of the coal mine according to claim 1, wherein the water injection mechanism (10) is a water injection pipe, one end of the water injection pipe is the water inlet (11), the other end of the water injection pipe is the water outlet (12), the water injection pipe is inserted into the drill hole, the hole sealing mechanism (20) is sleeved on the water injection pipe, and the water injection pipe is used for injecting water into the drill hole.

9. The pressure relief and backflow prevention hole sealing device for the coal mine according to claim 1, further comprising a check valve (40), wherein the check valve (40) is installed at the water outlet (12).

10. The pressure relief and backflow prevention hole sealing device for the coal mine according to claim 1, further comprising a flowmeter (50), wherein the flowmeter (50) is installed at the water inlet (11), and the flowmeter (50) is used for monitoring the inflow water flow of the water inlet (11).