CN111365063B - Wind boosting installation method for coal mine underground drilling gas pumping pipe - Google Patents

Wind boosting installation method for coal mine underground drilling gas pumping pipe Download PDF

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Publication number
CN111365063B
CN111365063B CN202010187930.8A CN202010187930A CN111365063B CN 111365063 B CN111365063 B CN 111365063B CN 202010187930 A CN202010187930 A CN 202010187930A CN 111365063 B CN111365063 B CN 111365063B
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hole
pipe
air
section
guide head
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CN111365063A (en
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王振锋
王永龙
王峰
赵博
张明建
徐学标
朱海波
卢志杰
陈跃朋
杨岁寒
张天山
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Henan University of Technology
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Henan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Abstract

The wind-assisted installation method for the coal mine underground drilling gas pumping pipe comprises the following steps: (1) connecting the rear end of the air injection guide head with the front end of the one-way ventilation perforated pipe; (2) the rear end of the unidirectional ventilation perforated pipe is connected with the front end of the hole sealing pipe; (3) extending the air injection guide head into a hole of the drilled hole, and connecting the rear end of the hole sealing pipe with the high-pressure air pipe; (4) opening a valve on the high-pressure air pipe to enable the air injection guide head to always float on the central line of the drilled hole; (5) pushing the hole sealing pipe forwards with force until the air injection guide head moves forwards to be in contact with the bottom of the drilled hole; (6) and sealing the hole in the annular space between the hole opening of the drill hole and the hole sealing pipe. When the gas pumping device is used, the gas pumping device is arranged at the front end of the hole sealing pipe, the end part is always positioned at the central line of a drilled hole under the action of high-pressure wind due to the special structural design, and the pumping pipe is driven to move in the drilled hole, so that the pumping pipe is guaranteed to be smoothly inserted into the bottom of the drilled hole, and the gas pumping effect is also guaranteed.

Description

Wind boosting installation method for coal mine underground drilling gas pumping pipe
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and particularly relates to a wind-powered boosting installation method for a coal mine underground drilling gas extraction pipe.
Background
After the drilling construction of the underground pumping, the smooth proceeding of the gas pumping is guaranteed, the insertion pipe hole sealing is required, however, due to the fact that a large amount of drilling cuttings exist in the drilling construction process, especially the drilling cuttings in the drilling process after the soft coal seam drilling construction are difficult to be completely discharged, the cuttings storage amount is large, the drilling cuttings are difficult to be accumulated when the hole sealing pipe is inserted, and the hole sealing pipe is prevented from being inserted. And because of the self gravity of the drill rod and the existence of gangue in the coal bed, the drilled hole is not a complete straight hole in practice and has a bending phenomenon. The hole sealing pipe is inserted the in-process and is touchhed the drilling wall at drilling bending part for the hole sealing pipe inserts the hole bottom degree of difficulty great, brings very big inconvenience and drawback for subsequent hole sealing, and then influences the gas extraction effect of hole sealing effect and later stage, brings very big hidden danger for the safety in production in colliery.
Disclosure of Invention
The invention provides a wind-powered boosting installation method for a coal mine underground drilling gas extraction pipe, aiming at overcoming the defects in the prior art, and the wind-powered boosting installation method is used for assisting a hole sealing pipe to be smoothly inserted into the bottom of a drilling hole after coal mine underground gas extraction drilling construction, dredging the drilling hole, and providing a required extraction channel for gas extraction after hole sealing.
In order to solve the technical problems, the invention adopts the following technical scheme: a coal mine underground drilling gas pumping pipe wind boosting installation method comprises the following steps,
(1) connecting the rear end of the air injection guide head with the front end of the one-way ventilation perforated pipe;
(2) the rear end of the unidirectional ventilation perforated pipe is connected with the front end of the hole sealing pipe;
(3) extending the air injection guide head into a hole of the drilled hole, and connecting the rear end of the hole sealing pipe with the high-pressure air pipe;
(4) opening a valve on a high-pressure air pipe, enabling high-pressure air to enter the air injection guide head through the hole sealing pipe and the one-way air-through perforated pipe in sequence, and enabling the high-pressure air to be sprayed out forwards, backwards and outwards along the radial direction in the air injection guide head respectively; the air flow sprayed forwards blows coal slag accumulated in the drill hole, and the drill hole is dredged and blocked in advance; the air flow sprayed backwards provides a counterforce to the air injection guide head, and an operator pushes the hole sealing pipe forwards with a little force to enable the air injection guide head to move towards the deep part of the drilled hole; the high-pressure airflow sprayed outwards along the radial direction enables the air injection guide head to float upwards, so that the air injection guide head always floats on the central line of the drilled hole;
(5) when the jet guide head moves forwards to be in contact with the bottom of the drill hole, the hole sealing pipe is pushed forwards with force, the front end of the jet guide head pushes the center of the bottom of the drill hole, high-pressure airflow jetted forwards by the jet guide head can jet a groove to the bottom of the drill hole, the jet guide head is positioned at the center of the drill hole after the front end of the jet guide head extends into the groove, and then a valve on a high-pressure air pipe is closed;
(6) and hole sealing operation is carried out in the annular space between the orifice of the drill hole and the hole sealing pipe, so that the central lines of the hole sealing pipe, the one-way ventilation perforated pipe and the air injection guide head are superposed with the central line of the drill hole.
The air injection guide head is composed of an oval end head section which is arranged at the front part, a cylindrical section which is arranged at the middle part and an inserting straight pipe section which is arranged at the rear part in sequence from front to back, the central lines of the oval end head section, the cylindrical section and the inserting straight pipe section are superposed, the diameter of the rear end of the oval end head section is equal to that of the cylindrical section, the diameter of the cylindrical section is larger than that of the inserting straight pipe section, a front and back through axial air outlet shunting hole is formed in the oval end head section and the cylindrical section along the central line, a circumferential air outlet structure and a rear air outlet boosting structure are formed in the cylindrical section, and the axial air outlet shunting hole, the air inlets of the circumferential air outlet structure and the rear air outlet boosting structure are communicated with the.
The circumferential direction air-out structure includes the first ring groove of seting up forward at cylinder section rear end face, and the coincidence of the central line of first ring groove and cylinder section, the minimum diameter in first ring groove is greater than the diameter of axial air-out reposition of redundant personnel hole, and the inside rear side of cylinder section has seted up the radial through-hole of a plurality of along the circumferencial direction, and the inner of radial through-hole all corresponds the intercommunication with the preceding tip in first ring groove.
The rear portion air-out boosting structure includes the second ring groove of seting up forward at cylinder section rear end face, the second ring groove coincides with the central line of cylinder section, the minimum diameter in second ring groove is greater than the maximum diameter in first ring groove, first ring groove is greater than second ring groove along the ascending length of axial direction, a plurality of L type through-hole has been seted up along the circumferencial direction to the inside front side of cylinder section, the radial direction setting of cylinder section and the inner of this section and the corresponding connection of second ring groove are followed to one section of L type through-hole, another section of L type through-hole is on the terminal surface before the outside cylinder section of the outer circumference of grafting straight tube section is located to the rear end opening that is on a parallel with the central line of cylinder section and this section.
A plurality of mounting groove has been seted up in the outer lane in first ring groove to cylinder section inside, and every mounting groove is inside all to slide and is equipped with a limit valve, is connected through a coil spring between the outer tip of limit valve and the bottom of mounting groove.
The back end of the unidirectional ventilation perforated pipe is coaxially and integrally provided with a connecting pipe joint for connecting a hole sealing pipe, the back part of the inserted straight pipe section is inserted into the front end of the unidirectional ventilation perforated pipe, a bolt pin is radially inserted into a pin hole corresponding to the inserted straight pipe section and the unidirectional ventilation perforated pipe, and the bolt pin is sealed by sealant; the inner wall of the one-way ventilating floral tube is provided with a one-way blocking plastic sheet at each ventilating hole, the rear side of each one-way blocking plastic sheet is adhered to the inner wall of the one-way ventilating floral tube at the rear side of each ventilating hole, and the radian of each one-way blocking plastic sheet is consistent with that of the inner wall of the one-way ventilating floral tube.
The specific process of the step (4) is that a valve of the high-pressure air pipe is opened, the wind power is adjusted, high-pressure air enters the air injection guide head through the hole sealing pipe and the one-way air-passing perforated pipe, the air holes are blocked by the one-way blocking plastic sheets adhered to the inner wall of the one-way air-passing perforated pipe under the action of the high-pressure air because the wind direction of the high-pressure air is from back to front in the one-way air-passing perforated pipe, the high-pressure air respectively enters the axial air outlet shunt hole at the front end in the insertion straight pipe section of the air injection guide head to form air flow which is ejected forwards, enters a first circular groove of the circumferential air outlet structure to form air flow which is ejected outwards along the radial direction, and enters a second circular groove of the rear air outlet boosting structure; high pressure wind that blows out forward through axial air-out reposition of redundant personnel hole can blow away the cinder of deposit in the drilling, high pressure wind through first ring groove enters into radial through-hole forward simultaneously, outwards spout by a plurality of radial through-hole, thereby make jet-propelled direction head hover on the central line of drilling, high pressure wind through second ring groove simultaneously enters into L type through-hole forward, high pressure wind is spout backward by the export of L type through-hole, this high pressure draught forms the jet-propelled air current, supplementary operator promotes the hole sealing pipe forward a little hard and can make jet-propelled direction head move to the drilling deep, until arriving drilling front end bottom.
By adopting the technical scheme, after grouting and hole sealing are completed, gas pumping operation is carried out, the outer pipe of the hole sealing pipe is connected with the pumping pipe, negative pressure is formed inside the one-way ventilation flower pipe in the gas pumping process, the one-way blocking plastic thin sheet at the ventilation hole on the one-way ventilation flower pipe is opened, the ventilation hole on the one-way ventilation flower pipe, the axial air outlet flow distribution hole at the end of the air injection guide head, the circumferential air outlet structure and the rear air outlet boosting structure can be used as the discharge hole of gas, and therefore gas enters the pumping system through the one-way ventilation flower pipe, the hole sealing pipe and the pumping pipe.
The outer surface of the ellipsoidal head section in the front of the air injection guide head is a smooth semi-ellipsoidal surface, so that the head can be prevented from touching the wall of a drill hole and being clamped after being inserted into the drill hole.
The radial through holes of the circumferential air outlet structure are uniformly and symmetrically arranged on the cylindrical section in the middle of the air injection guide head, the quantity of the radial through holes is determined according to the condition, the main effect is that the left and right sizes of the air injection guide head are the same, and the air quantities with different sizes are different from top to bottom, so that the air injection guide head is kept to always float on the central line of a drilled hole, and the air outlet quantity of the radial through holes is accurately controlled by an internal limiting valve and a helical spring.
The L-shaped through holes are uniformly and symmetrically arranged in the cylindrical section in the middle of the air injection guide head, the air outlet volume of each L-shaped through hole is equal, and the L-shaped through holes are used for ejecting air and giving a reaction force to the air injection guide head to drive the air injection guide head to drag the hole sealing pipe to move towards the deep part of a drilled hole. The air output can be adjusted by utilizing the air pressure according to the actual condition.
High-pressure air is sprayed out from the front end part of the air-spraying guide head along the axial air-out shunting hole, so that the accumulated coal slag at the front part of the drill hole can be blown, and the function of dredging and blocking the drill hole in advance is achieved.
The limiting valve is a metal cylinder with smooth appearance, be connected to mounting groove bottom and limiting valve through coil spring both ends, the limiting valve that is located jet-propelled direction head upper portion can stretch out the mounting groove downwards because of the action of gravity, block the space of the first mounting groove of upper portion partly, thereby it is little to make the radial through-hole air output that is located first circular groove upper portion, and the limiting valve that is located jet-propelled direction head lower portion can compress coil spring under self action of gravity, enlarge the space that partly first mounting groove passes through, thereby make the radial through-hole air output of lower part great, the combination of a plurality of radial through-hole makes the buoyancy of total air output equal to the gravity of jet-propelled direction head and front portion hole sealing pipe basically, and then keep jet-propelled direction head in the central point of drilling.
The one-way ventilating floral tube is a section of plastic straight tube, and each air hole on the one-way ventilating floral tube is adhered with a one-way blocking sheet which is consistent with the radian of the pipe diameter on the surface of the pipe diameter of the one-way ventilating floral tube. The whole one-way ventilation perforated pipe has the function that air flow can only enter the perforated pipe from the outside through the ventilation holes, and the air in the perforated pipe cannot be pressed to the outside. One-way separation thin slice can cover the bleeder vent under pressure effect when the intraductal high-pressure gas that lets in of flower pipe of ventilating, prevent that the air current from leaking outward, at the gas pumping in-process of later stage, the inside negative pressure effect that is of one-way flower intraductal portion of ventilating, the inside perk of one-way separation thin slice to one-way flower intraductal portion of ventilating, the bleeder vent on the one-way flower pipe of ventilating of gas accessible gets into one-way flower pipe and gets into the pumping system that finally reachs, at the in-process of propelling jet-propelled direction head forward, owing to the existence of one-way separation thin slice, can also prevent that the cinder from getting into one-way flower pipe of ventilating, the.
In conclusion, the gas extraction device is scientific in principle and compact in structure, is installed at the front end of the hole sealing pipe when in use, enables the end part of the device to be always positioned at the central line of a drilled hole under the action of high-pressure wind through a special structural design, drives the extraction pipe to move in the drilled hole, ensures that the extraction pipe is smoothly inserted into the bottom of the drilled hole, and also ensures the gas extraction effect.
Drawings
FIG. 1 is a schematic front view of an air jet guide head according to the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is an axial cross-sectional view of FIG. 1;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a cross-sectional view B-B of FIG. 3;
FIG. 6 is a cross-sectional view C-C of FIG. 3;
FIG. 7 is a front view of the one-way venting floral tube of the present invention;
FIG. 8 is an axial cross-sectional view of FIG. 7;
fig. 9 is a cross-sectional view taken along line D-D in fig. 8.
Detailed Description
As shown in fig. 1-9, the wind-powered boosting installation method for the gas pumping pipe in the coal mine underground borehole of the invention comprises the following steps,
(1) the rear end of the air injection guide head is connected with the front end of the one-way ventilation perforated pipe 17;
(2) the rear end of the unidirectional ventilation perforated pipe 17 is connected with the front end of the hole sealing pipe;
(3) extending the air injection guide head into a hole of the drilled hole, and connecting the rear end of the hole sealing pipe with the high-pressure air pipe;
(4) opening a valve on the high-pressure air pipe, enabling the high-pressure air to enter the air injection guide head through the hole sealing pipe and the one-way vent floral tube 17 in sequence, and spraying the high-pressure air forwards, backwards and outwards along the radial direction in the air injection guide head respectively; the air flow sprayed forwards blows coal slag accumulated in the drill hole, and the drill hole is dredged and blocked in advance; the air flow sprayed backwards provides a counterforce to the air injection guide head, and an operator pushes the hole sealing pipe forwards with a little force to enable the air injection guide head to move towards the deep part of the drilled hole; the high-pressure airflow sprayed outwards along the radial direction enables the air injection guide head to float upwards, so that the air injection guide head always floats on the central line of the drilled hole;
(5) when the jet guide head moves forwards to be in contact with the bottom of the drill hole, the hole sealing pipe is pushed forwards with force, the front end of the jet guide head pushes the center of the bottom of the drill hole, high-pressure airflow jetted forwards by the jet guide head can jet a groove to the bottom of the drill hole, the jet guide head is positioned at the center of the drill hole after the front end of the jet guide head extends into the groove, and then a valve on a high-pressure air pipe is closed;
(6) and hole sealing operation is carried out in the annular space between the orifice of the drill hole and the hole sealing pipe, so that the central lines of the hole sealing pipe, the one-way ventilation perforated pipe 17 and the air injection guide head are superposed with the central line of the drill hole.
The air injection guide head is composed of an ellipsoid end head section 2 which is arranged at the front part in sequence from front to back, a cylindrical section 1 at the middle part and an inserting straight pipe section 4 at the back part, the ellipsoid end head section 2, the central lines of the cylindrical section 1 and the inserting straight pipe section 4 are superposed, the diameter of the back end of the ellipsoid end head section 2 is equal to that of the cylindrical section 1, the diameter of the cylindrical section 1 is larger than that of the inserting straight pipe section 4, an axial air outlet shunting hole 13 which is through from front to back is formed in the ellipsoid end head section 2 and the cylindrical section 1 along the central line, a circumferential air outlet structure and a rear air outlet boosting structure are formed in the cylindrical section 1, and air inlets of the axial air outlet shunting hole 13, the circumferential air outlet structure and the rear air outlet boosting structure are communicated with the inside of the.
The circumferencial direction air-out structure includes the first ring groove 12 of seting up forward at 1 rear end of cylinder section, and the coincidence of the central line of first ring groove 12 and cylinder section 1, the minimum diameter of first ring groove 12 is greater than the diameter of axial air-out reposition of redundant personnel hole 13, and a plurality of radial through-hole 3 has been seted up along the circumferencial direction to the inside rear side of cylinder section 1, and the inner of radial through-hole 3 all corresponds the intercommunication with the preceding tip of first ring groove 12.
The rear portion air-out boosting structure includes the second ring groove 11 of seting up forward at 1 rear end of cylinder section, second ring groove 11 and the coincidence of the central line of cylinder section 1, the minimum diameter of second ring groove 11 is greater than the maximum diameter of first ring groove 12, first ring groove 12 is greater than second ring groove 11 along the ascending length of axial direction along the axial direction, a plurality of L type through-hole 6 has been seted up along the circumferencial direction in the inside front side of cylinder section 1, the inner and the second ring groove 11 of the radial direction setting of cylinder section 1 and this section of L type through-hole 6 correspond and are connected, another section of L type through-hole 6 is on a parallel with the central line of cylinder section 1 and the rear end opening of this section is located the cylinder section 1 front end face of the outer circumference outside of grafting straight tube section 4.
A plurality of mounting groove 10 has been seted up at the outer lane of first ring groove 12 inside cylinder section 1, and every mounting groove 10 is inside all to slide and is equipped with a limit valve 8, is connected through a coil spring 9 between the outer tip of limit valve 8 and the bottom of mounting groove 10.
The unidirectional ventilation perforated pipe 17 is provided with a plurality of ventilation holes 15, the rear end of the unidirectional ventilation perforated pipe 17 is coaxially and integrally provided with a connecting pipe joint 18 for connecting a hole sealing pipe, the rear part of the inserted straight pipe section 4 is inserted into the front end of the unidirectional ventilation perforated pipe 17, a bolt pin is radially inserted into a pin hole 5 corresponding to the inserted straight pipe section 4 and the unidirectional ventilation perforated pipe 17, and the bolt pin is sealed by sealant; the inner wall of the one-way ventilating floral tube 17 is provided with a one-way blocking plastic sheet 14 at each air vent 15, the rear side of each one-way blocking plastic sheet 14 is adhered to the inner wall of the one-way ventilating floral tube 17 at the rear side of the air vent 15, and the radian of each one-way blocking plastic sheet 14 is consistent with that of the inner wall of the one-way ventilating floral tube 17.
The specific process of the step (4) is that a valve of the high-pressure air pipe is opened, the wind power is adjusted, high-pressure air enters the air injection guide head through the hole sealing pipe and the one-way air-passing perforated pipe 17, because the wind direction of the high-pressure air is from back to front in the one-way air-passing perforated pipe 17, under the action of the high-pressure air, the air holes 15 are sealed by the one-way blocking plastic sheets 14 adhered to the inner wall of the one-way air-passing perforated pipe 17, the high-pressure air respectively enters the axial air-out shunting holes 13 at the front end in the insertion straight pipe section 4 of the air injection guide head to form air flow which is ejected forwards, enters the first annular groove 12 of the circumferential air-out structure to form air flow which is ejected outwards along the radial direction, and enters the second annular groove 11 of the rear air-; high pressure wind blown forward through axial air-out diffluent hole 13 blows away the cinder of deposit in the drilling, high pressure wind through first ring groove 12 simultaneously enters into radial through-hole 3 forward, spout outward by the radial through-hole 3 of a plurality of, thereby make jet-propelled direction head hover on the central line of drilling, high pressure wind through second ring groove 11 simultaneously enters into L type through-hole 6 forward, high pressure wind is spout backward by the export of L type through-hole 6, this high pressure draught forms the reverse jet-flow, supplementary operator promotes the hole sealing pipe forward a little and can make jet-propelled direction head move to the deep drilling, until reaching drilling front end bottom.
After grouting and hole sealing are completed, gas pumping operation is carried out, the outer pipe of the hole sealing pipe is connected with a pumping pipe, negative pressure is formed inside the one-way ventilation flower pipe 17 in the gas pumping process, the one-way blocking plastic sheet 14 at the air hole 15 in the one-way ventilation flower pipe 17 is opened, the air hole 15 in the one-way ventilation flower pipe 17, the air injection guide head end axial air outlet flow distribution hole 13, the circumferential air outlet structure and the rear air outlet boosting structure can be used as gas discharge holes, and therefore gas enters a pumping system through the one-way ventilation flower pipe 17, the hole sealing pipe and the pumping pipe.
The outer surface of the elliptical end head section 2 at the front part of the air injection guide head is a smooth semi-elliptical surface, so that the end head can be prevented from touching the wall of a drill hole and being clamped after being inserted into the drill hole.
Radial through holes 3 of the circumferential air outlet structure are uniformly and symmetrically arranged on the cylindrical section 1 in the middle of the air injection guide head, the quantity is determined according to the condition, the main effect is that the left and right sizes of the air injection are the same, and the air quantities with different sizes are different from top to bottom, so that the air injection guide head is kept to always float on the central line of the drilled hole, and the air outlet quantity of the radial through holes 3 is accurately controlled by an internal limiting valve 8 and a helical spring 9.
The L-shaped through holes 6 are uniformly and symmetrically arranged in the cylindrical section 1 in the middle of the air injection guide head, the air outlet volume of each L-shaped through hole 6 is equal, and the air injection guide head is used for ejecting air and giving a reaction force to the air injection guide head to drive the air injection guide head to drag the hole sealing pipe to move towards the deep part of a drilled hole. The air output can be adjusted by utilizing the air pressure according to the actual condition.
High-pressure air is sprayed out from the front end part of the air-spraying guide head along the axial air-out shunting hole 13, and can blow accumulated coal slag at the front part of the drill hole, thereby playing the role of dredging and blocking the drill hole in advance.
The limit valve 8 is a metal cylinder with smooth appearance, be connected to mounting groove 10 bottom and limit valve 8 through coil spring 9 both ends, the limit valve 8 that is located jet-propelled guide head upper portion can stretch out mounting groove 10 downwards because of action of gravity helical spring 9, block the space of the first mounting groove 10 of upper portion partly, thereby it is little to make the radial through-hole 3 air output that is located first circular groove 12 upper portion, and the limit valve 8 that is located jet-propelled guide head lower part can compress coil spring 9 under self action of gravity, enlarge the space that partly first mounting groove 10 passes through, thereby make the radial through-hole 3 air output of lower part great, the buoyancy that a plurality of radial through-hole 3 combinations made the total air output basically equals the gravity of jet-propelled guide head and anterior hole sealing pipe, and then keep jet-propelled guide head in the central point of drilling.
The one-way ventilating floral tube 17 is a section of plastic straight tube, and each air hole 15 on the one-way ventilating floral tube 17 is stuck with a one-way blocking sheet which is consistent with the radian of the tube diameter on the surface of the tube diameter of the one-way ventilating floral tube. The function of the whole one-way ventilation perforated pipe 17 is that the airflow can only enter the perforated pipe from the outside through the ventilation holes 15, and the air in the inner part can not be pressed to the outside. One-way separation thin slice can cover bleeder vent 15 under the pressure effect when the intraductal high-pressure gas that lets in of one-way gas floral tube 17, prevent that the air current from leaking outward, at the gas extraction in-process of later stage, the inside negative pressure effect that is of one-way gas floral tube 17, the inside perk of one-way separation thin slice to one-way gas floral tube 17, bleeder vent 15 on the one-way gas floral tube 17 of gas accessible gets into one-way gas floral tube 17 and gets into the extraction pipe and finally reach the extraction system, at the in-process of propelling the jet-propelled head forward, because the existence of one-way separation thin slice, can also prevent that the cinder from getting into one-way gas floral tube 17, the normal clear of gas extraction has been guaranteed.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (7)

1. A coal mine underground drilling gas pumping pipe wind boosting installation method is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) connecting the rear end of the air injection guide head with the front end of the one-way ventilation perforated pipe;
(2) the rear end of the unidirectional ventilation perforated pipe is connected with the front end of the hole sealing pipe;
(3) extending the air injection guide head into a hole of the drilled hole, and connecting the rear end of the hole sealing pipe with the high-pressure air pipe;
(4) opening a valve on a high-pressure air pipe, enabling high-pressure air to enter the air injection guide head through the hole sealing pipe and the one-way air-through perforated pipe in sequence, and enabling the high-pressure air to be sprayed out forwards, backwards and outwards along the radial direction in the air injection guide head respectively; the air flow sprayed forwards blows coal slag accumulated in the drill hole, and the drill hole is dredged and blocked in advance; the air flow sprayed backwards provides a counterforce to the air injection guide head, and an operator pushes the hole sealing pipe forwards with a little force to enable the air injection guide head to move towards the deep part of the drilled hole; the high-pressure airflow sprayed outwards along the radial direction enables the air injection guide head to float upwards, so that the air injection guide head always floats on the central line of the drilled hole;
(5) when the jet guide head moves forwards to be in contact with the bottom of the drill hole, the hole sealing pipe is pushed forwards with force, the front end of the jet guide head pushes the center of the bottom of the drill hole, high-pressure airflow jetted forwards by the jet guide head can jet a groove to the bottom of the drill hole, the jet guide head is positioned at the center of the drill hole after the front end of the jet guide head extends into the groove, and then a valve on a high-pressure air pipe is closed;
(6) and hole sealing operation is carried out in the annular space between the orifice of the drill hole and the hole sealing pipe, so that the central lines of the hole sealing pipe, the one-way ventilation perforated pipe and the air injection guide head are superposed with the central line of the drill hole.
2. The coal mine underground borehole gas pumping pipe wind-powered boosting installation method according to claim 1, characterized in that: the air injection guide head is composed of an oval end head section which is arranged at the front part, a cylindrical section which is arranged at the middle part and an inserting straight pipe section which is arranged at the rear part in sequence from front to back, the central lines of the oval end head section, the cylindrical section and the inserting straight pipe section are superposed, the diameter of the rear end of the oval end head section is equal to that of the cylindrical section, the diameter of the cylindrical section is larger than that of the inserting straight pipe section, a front and back through axial air outlet shunting hole is formed in the oval end head section and the cylindrical section along the central line, a circumferential air outlet structure and a rear air outlet boosting structure are formed in the cylindrical section, and the axial air outlet shunting hole, the air inlets of the circumferential air outlet structure and the rear air outlet boosting structure are communicated with the.
3. The coal mine underground borehole gas pumping pipe wind-powered boosting installation method according to claim 2, characterized in that: the circumferential direction air-out structure includes the first ring groove of seting up forward at cylinder section rear end face, and the coincidence of the central line of first ring groove and cylinder section, the minimum diameter in first ring groove is greater than the diameter of axial air-out reposition of redundant personnel hole, and the inside rear side of cylinder section has seted up the radial through-hole of a plurality of along the circumferencial direction, and the inner of radial through-hole all corresponds the intercommunication with the preceding tip in first ring groove.
4. The coal mine underground borehole gas pumping pipe wind-powered boosting installation method according to claim 3, characterized in that: the rear portion air-out boosting structure includes the second ring groove of seting up forward at cylinder section rear end face, the second ring groove coincides with the central line of cylinder section, the minimum diameter in second ring groove is greater than the maximum diameter in first ring groove, first ring groove is greater than second ring groove along the ascending length of axial direction, a plurality of L type through-hole has been seted up along the circumferencial direction to the inside front side of cylinder section, the radial direction setting of cylinder section and the inner of this section and the corresponding connection of second ring groove are followed to one section of L type through-hole, another section of L type through-hole is on the terminal surface before the outside cylinder section of the outer circumference of grafting straight tube section is located to the rear end opening that is on a parallel with the central line of cylinder section and this section.
5. The coal mine underground borehole gas pumping pipe wind-powered boosting installation method according to claim 4, characterized in that: a plurality of mounting groove has been seted up in the outer lane in first ring groove to cylinder section inside, and every mounting groove is inside all to slide and is equipped with a limit valve, is connected through a coil spring between the outer tip of limit valve and the bottom of mounting groove.
6. The coal mine underground borehole gas pumping pipe wind-powered boosting installation method according to claim 5, characterized in that: the back end of the unidirectional ventilation perforated pipe is coaxially and integrally provided with a connecting pipe joint for connecting a hole sealing pipe, the back part of the inserted straight pipe section is inserted into the front end of the unidirectional ventilation perforated pipe, a bolt pin is radially inserted into a pin hole corresponding to the inserted straight pipe section and the unidirectional ventilation perforated pipe, and the bolt pin is sealed by sealant; the inner wall of the one-way ventilating floral tube is provided with a one-way blocking plastic sheet at each ventilating hole, the rear side of each one-way blocking plastic sheet is adhered to the inner wall of the one-way ventilating floral tube at the rear side of each ventilating hole, and the radian of each one-way blocking plastic sheet is consistent with that of the inner wall of the one-way ventilating floral tube.
7. The coal mine underground borehole gas pumping pipe wind-powered boosting installation method according to claim 6, characterized in that: the specific process of the step (4) is that,
opening a valve of a high-pressure air pipe, adjusting the wind power, enabling high-pressure air to enter the air injection guide head through a hole sealing pipe and a one-way air-vent floral tube, wherein the wind direction of the high-pressure air is from back to front in the one-way air-vent floral tube, so that under the action of the high-pressure air, the air holes are blocked by a one-way blocking plastic sheet adhered to the inner wall of the one-way air-vent floral tube, the high-pressure air respectively enters an axial air outlet shunt hole at the front end in the insertion straight tube section of the air injection guide head to form forward-sprayed air flow, enters a first annular groove of a circumferential air outlet structure to form outward-sprayed air flow along the radial direction, and enters a second annular groove of a rear air outlet boosting structure; high pressure wind that blows out forward through axial air-out reposition of redundant personnel hole can blow away the cinder of deposit in the drilling, high pressure wind through first ring groove enters into radial through-hole forward simultaneously, outwards spout by a plurality of radial through-hole, thereby make jet-propelled direction head hover on the central line of drilling, high pressure wind through second ring groove simultaneously enters into L type through-hole forward, high pressure wind is spout backward by the export of L type through-hole, this high pressure draught forms the jet-propelled air current, supplementary operator promotes the hole sealing pipe forward a little hard and can make jet-propelled direction head move to the drilling deep, until arriving drilling front end bottom.
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