CN113931590A - Hydraulic cutting device and gas extraction pipe cutting method - Google Patents
Hydraulic cutting device and gas extraction pipe cutting method Download PDFInfo
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- CN113931590A CN113931590A CN202111239152.3A CN202111239152A CN113931590A CN 113931590 A CN113931590 A CN 113931590A CN 202111239152 A CN202111239152 A CN 202111239152A CN 113931590 A CN113931590 A CN 113931590A
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- 238000000605 extraction Methods 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 239000003245 coal Substances 0.000 claims description 90
- 238000005553 drilling Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 230000005641 tunneling Effects 0.000 description 6
- 238000005065 mining Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a hydraulic cutting device and a gas extraction pipe cutting method, wherein the hydraulic cutting device comprises a high-pressure water pump, a drill rod inserted into a gas extraction pipe, a hydraulic cutting head detachably connected with the head of the drill rod and a supporting seat used for supporting the tail of the drill rod; the hydraulic cutting head comprises a cutting head shell, a nozzle and a rolling bearing used for being supported between the cutting head shell and a gas extraction pipe. The hydraulic cutting head can be driven by the drill rod to rotate in the gas extraction pipe, high-pressure water is supplied to the hydraulic cutting head through the high-pressure water pump, and the high-pressure water is sprayed out from the nozzle of the hydraulic cutting head, so that the annular pipe wall of the gas extraction pipe can be annularly cut.
Description
Technical Field
The invention relates to the technical field of coal mine construction, in particular to a hydraulic cutting device and a gas extraction pipe cutting method.
Background
In the process of mining coal in mines, there are often "triple soft" type coal seams which are poorly permeable and, during the recovery, often encounter thick coal zones. High-concentration gas can be gathered in the mining area at the top of the upper corner of the working face, and the gas overrun phenomenon often occurs in the mining process.
In the prior art, the measures generally adopted are as follows: and digging an extraction roadway (a first gateway of the coal pillar) at the adjacent side, wherein the distance between the extraction roadway and the return air gateway of the working face is about 25 m. The width of the coal pillar between the first coal pillar crossheading and the working face return air crossheading is wide, and the coal pillar is called as a large coal pillar.
A plurality of spaced gas extraction pipes are pre-buried in the large coal pillar, the spacing distance is about 50m meters, and the inclination angle of each gas extraction pipe is about 8-9 degrees. The gas extraction pipe gradually rises from the first gateway of the coal pillar to the side of the return air gateway of the working face.
The gas extraction pump station is connected with the gas extraction pipe through a pipeline to extract gas so as to reduce the gas concentration in the extraction working face.
And because the large coal pillar is wider, the recovery rate is low and the resource waste is serious.
In the improved scheme, a 'small coal pillar' process is adopted, namely a second coal pillar crossheading is dug in a position 4-5 meters away from the return air crossheading side of the working face in the large coal pillar. A reserved working surface is arranged between the first gateway and the second gateway of the coal pillar, the part of the coal pillar can be recycled, the recovery rate of coal resources is improved, and the purposes of high yield and high efficiency are achieved.
However, when the second gate way of the coal pillar is tunneled, the gas extraction pipe in the region to be tunneled can affect the tunneling construction operation of the tunneling machine. The existing cutting device cannot cut the gas extraction pipe in the coal seam, and certain trouble is brought to coal mining work.
In view of this, it is necessary to provide a hydraulic cutting device and a gas extraction pipe cutting method for cutting a gas extraction pipe in a coal seam.
Disclosure of Invention
The invention aims to provide a hydraulic cutting device and a cutting method for a gas extraction pipe in a coal seam.
The technical scheme of the invention provides a hydraulic cutting device for cutting a gas extraction pipe in a coal seam;
the hydraulic cutting device comprises a high-pressure water pump, a drill rod, a hydraulic cutting head and a supporting seat, wherein the drill rod is used for being inserted into a gas extraction pipe;
the drill rod is rotatably arranged on the supporting seat, and a drill rod through hole for water flow to pass through is formed in the center of the drill rod;
a rotary handle is arranged at the tail part of the drill rod;
a water pipe is connected between the water outlet of the high-pressure water pump and the drill rod through hole;
the hydraulic cutting head comprises a cutting head shell, a nozzle and a rolling bearing used for being supported between the cutting head shell and the gas extraction pipe;
the cutting head shell is internally provided with a water flow channel, the cutting head shell is detachably connected with the head end of the drill rod, and the water flow channel is communicated with the drill rod through hole;
the nozzle is mounted on the cutting head housing, the nozzle being in communication with the water flow passage;
the rolling bearing is sleeved on the cutting head shell.
In one alternative, the cutter head housing is arranged with a plurality of the nozzles spaced apart in an axial direction.
In one alternative, the cutting head housing is arranged with a plurality of nozzles spaced apart in a circumferential direction.
In one alternative, the head end of the cutting head housing has a tapered leading end.
In one optional technical scheme, the water pipe is connected with the tail end of the drill rod through an adapter assembly;
the adapter assembly comprises a water pipe connector detachably connected with the water pipe and a drill rod connector detachably connected with the drill rod;
the drilling rod connector with water piping connection head sealing connection, just the drilling rod connector can for water piping connection head rotates.
In one optional technical scheme, the supporting seat comprises a base and a supporting frame arranged on the base, and the supporting frame is provided with a supporting ring for the drill rod to pass through;
more than two support frames are arranged on the base at intervals along the axial direction of the drill rod;
the drill rod passes through the support ring on each support frame.
In one alternative, the top plate of the base extends obliquely upward in a direction from the trailing end to the leading end of the drill rod.
The technical scheme of the invention also provides a gas extraction pipe cutting method for cutting a gas extraction pipe in a coal seam by adopting the hydraulic cutting device in any one of the technical schemes, wherein the gas extraction pipe is communicated between the first gateway of the coal pillar and the return air gateway of the working face;
the gas extraction pipe extends upwards in an inclined mode in the direction from the first gateway of the coal pillar to the return air gateway of the working face;
the cutting method of the gas extraction pipe comprises the following steps:
s01: predefining a range of a second gateway of the coal pillar to be excavated;
s02: placing the hydraulic cutting device in a first gateway of the coal pillar, and inserting the hydraulic cutting head into the gas extraction pipe;
s03: moving the hydraulic cutting head to the range of a first gate of a coal pillar to be dug by moving the drill rod;
s04: starting the high-pressure water pump and rotating the drill rod to drive the hydraulic cutting head to rotate in the gas extraction pipe, and performing annular cutting on the annular pipe wall of the gas extraction pipe by using high-pressure water jetted from the nozzle;
s05: after the preset time, stopping the high-pressure water pump, pumping the drill rod backwards, driving the hydraulic cutting head to move to the next position in the range of the second gateway of the coal pillar, and cutting according to the operation mode of the step S04;
s06: and repeating the step S05, and cutting the gas extraction pipe in the range of the second gate way of the coal pillar into a plurality of sections.
In one optional technical scheme, the cutting method for the gas extraction pipe further comprises the step of S07:
s07: and plugging two ends of the gas extraction pipe, and injecting a high-water material into the gas extraction pipe.
In one optional technical scheme, the high-pressure water pump supplies high-pressure water containing carborundum, and the high-pressure water containing the carborundum is sprayed out through the nozzle.
By adopting the technical scheme, the method has the following beneficial effects:
according to the hydraulic cutting device and the cutting method for the gas extraction pipe, the hydraulic cutting head can be driven by the drill rod to rotate in the gas extraction pipe, high-pressure water is supplied to the hydraulic cutting head through the high-pressure water pump, and the high-pressure water is sprayed out from the nozzle of the hydraulic cutting head, so that the annular pipe wall of the gas extraction pipe can be cut annularly.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic cutting device according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the connection of a high pressure water pump, a water pipe, a support base and a drill rod;
FIG. 3 is a schematic view of a hydraulic cutting head;
FIG. 4 is a schematic view of the connector assembly connecting the water pipe and the drill pipe;
FIG. 5 is a schematic view of a gas extraction pipe in a coal seam being cut by a hydraulic cutting device;
fig. 6 is a plan view of the gas extraction pipe arranged in the coal pillar.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1 to 6, an embodiment of the present invention provides a hydraulic cutting device for cutting a gas extraction pipe 7 in a coal seam.
The hydraulic cutting device comprises a high-pressure water pump 1, a drill rod 2 inserted into a gas extraction pipe 7, a hydraulic cutting head 3 detachably connected with the head of the drill rod 2 and a supporting seat 4 used for supporting the tail of the drill rod 2.
The drill rod 2 is rotatably mounted on the support block 4, the center of the drill rod 2 having a drill rod through hole 21 for the passage of water.
The end of the drill rod 2 is fitted with a rotary handle 22.
A water pipe 5 is connected between the water outlet of the high-pressure water pump 1 and the drill rod through hole 21.
The hydraulic cutting head 3 includes a cutting head housing 31, a nozzle 32, and a rolling bearing 33 for being supported between the cutting head housing 31 and the gas extraction pipe 7.
The cutting head shell 31 is internally provided with a water flow channel 311, the cutting head shell 31 is detachably connected with the head end of the drill rod 2, and the water flow channel 311 is communicated with the drill rod through hole 21.
A nozzle 32 is mounted on the cutting head housing 31, the nozzle 32 communicating with the water flow passage 311.
The rolling bearing 33 is fitted over the cutting head housing 31.
The hydraulic cutting device provided by the invention is used for cutting the gas extraction pipe 7 in the coal seam.
As shown in fig. 5-6, the working surface 100 is flanked by a working surface return air gateway 101 and a working surface transport gateway 102. The outside of the working face return air gateway 101 is a coal pillar 200. A first gateway 201 of the coal pillar is dug out at about 25m from the face return air gateway 101 of the coal pillar 200. And drilling a hole from the first gateway 201 of the coal pillar to the return air gateway 101 of the working face, and arranging the gas extraction pipe 7 in the hole so as to extract gas in a mining area at the top of the upper corner of the working face 100 through a gas extraction pump station. The gas extraction pipes 7 are obliquely arranged, the inclination angle of each gas extraction pipe 7 is about 8-9 degrees, the end parts of the gas extraction pipes 7, which are positioned at the return air crossheading 101 of the working face, are high, and the end parts of the gas extraction pipes 7, which are positioned at the first crossheading 201 of the coal pillar, are low.
In order to increase the recovery rate of the coal pillar 200, it is necessary to dig a second coal pillar gateway 202 about 4 to 5m close to the face return air gateway 101 to recover the coal pillar between the second coal pillar gateway 202 and the first coal pillar gateway 201. At this time, the gas extraction pipe 7 is arranged transversely in the area or range where the second gate 202 of the coal pillar needs to be excavated. Therefore, before the second coal pillar gate 202 is excavated, the gas extraction pipe 7 in a region or range of the second coal pillar gate 202 needs to be cut to facilitate the heading operation of the heading machine.
The hydraulic cutting device comprises a high-pressure water pump 1, a drill rod 2, a hydraulic cutting head 3, a supporting seat 4 and a water pipe 5.
The water inlet end of the high-pressure water pump 1 is connected with a water source through a water pipe. The water outlet of the high-pressure water pump 1 is connected with the tail end of the drill rod 2 through a water pipe 5. The drill rod 2 is supported by a support block 4, on which support block 2 the drill rod 2 can be rotated. The drill rod 2 has a drill rod through bore 21 through its head and tail ends, in which bore 21 water can flow for supply to the hydraulic cutting head 3 connected to the head end of the drill rod 2. The tail end of the drill rod 2 is provided with a rotating handle 22, an operator can hold the rotating handle 22 to rotate the drill rod 2, so that the drill rod 2 rotates on the supporting seat 4, and the hydraulic cutting head 3 is driven to rotate and cut in the gas extraction pipe 7.
When the hydraulic cutting device is used, the high-pressure water pump 1 and the supporting seat 4 are installed in the first gateway 201 of the coal pillar, the drill rod 2 drives the hydraulic cutting head 3 to enter the gas extraction pipe 7, the position of the hydraulic cutting head 3 in the gas extraction pipe 7 is adjusted through the back and forth movement of the drill rod 2, the hydraulic cutting head 3 is driven to rotate in the gas extraction pipe 7 through the circumferential rotation of the drill rod 2, and therefore the annular pipe wall of the gas extraction pipe 7 is cut in an annular mode.
The hydraulic cutting head 3 consists essentially of a cutting head housing 31, a nozzle 32 and a rolling bearing 33. The cutting head housing 31 has a water flow passage 311 therein, the cutting head housing 31 is threadedly connected to the head end of the drill rod 2, and the water flow passage 311 communicates with the drill rod through hole 21, so that high-pressure water can enter the water flow passage 311. The water pressure of the high-pressure water is between 50 and 70 MPa.
The nozzle 32 is installed on the circumferential surface of the cutting head housing 31, the nozzle 32 is communicated with the water flow passage 311, and high-pressure water can be sprayed through the nozzle 32 to cut the pipe wall of the gas extraction pipe 7.
The rolling bearing 33 is sleeved on the cutting head shell 31 and is used for being supported between the cutting head shell 31 and the pipe wall of the gas extraction pipe 7, so that the cutting head shell 31 can smoothly rotate in the gas extraction pipe 7. The length of the nozzle 32 is smaller than the thickness of the rolling bearing 33, the rolling bearing 33 supports the cutting head shell 31, and enough space is formed between the cutting head shell 31 and the pipe wall of the gas extraction pipe 7 for the nozzle 32 to integrally rotate along with the cutting head shell 31.
When the hydraulic cutting device is used for cutting the gas extraction pipe 7 in the coal seam, the operation mode is as follows:
a range of the second gate 202 of the pillar to be excavated is previously defined in the pillar 200. A hydraulic cutting device is placed in the first gateway 201 of the coal pillar, and the hydraulic cutting head 3 is inserted into the gas extraction pipe 7. The hydraulic cutting head 3 is moved by moving the drill pipe 2 into the range of the first gate 202 of the coal pillar to be dug. After the range of the second coal pillar gate 202 is determined in advance, the distance between the boundary range of the second coal pillar gate 202 and the first coal pillar gate 201 and the moving range of the drill rod 2 can be determined. According to the depth of the drill rod 2 and the hydraulic cutting head 3 inserted into the gas extraction pipe 7, whether the hydraulic cutting head 3 is located in the boundary range of the second gateway 202 of the coal pillar can be determined.
After the hydraulic cutting head 3 is located in the boundary range of the second gateway 202 of the coal pillar and reaches a preset position, the high-pressure water pump 1 is started and the drill rod 2 is rotated to drive the hydraulic cutting head 3 to rotate in the gas extraction pipe 7, and high-pressure water jetted from the nozzle 32 performs annular cutting on the annular pipe wall of the gas extraction pipe 7.
After the preset time, the pipe wall at the position is cut, the high-pressure water pump 1 is stopped, the drill rod 2 is pulled backwards (tail end), the hydraulic cutting head 3 is driven to move to the next position behind in the range of the second gateway 202 of the coal pillar, and then the pipe wall at the position is cut.
And repeating the operation to cut the gas extraction pipe 7 in the range of the second gateway 202 of the coal pillar into a plurality of sections, so that the tunneling operation of the tunneling machine cannot be influenced.
In summary, according to the hydraulic cutting device provided by the invention, the hydraulic cutting head 3 can be driven by the drill rod 2 to rotate in the gas extraction pipe 7, high-pressure water is supplied to the hydraulic cutting head 3 through the high-pressure water pump 1, and the high-pressure water is sprayed out from the nozzle 32 of the hydraulic cutting head 3, so that the annular pipe wall of the gas extraction pipe 7 can be annularly cut.
In one embodiment, as shown in fig. 3, the cutting head housing 31 is provided with a plurality of nozzles 32 at intervals along the axial direction, and the wall of the gas extraction pipe 7 can be cut into a plurality of sections at a time.
In one embodiment, as shown in fig. 3, the cutting head housing 31 is provided with a plurality of nozzles 32 at intervals along the circumferential direction, which improves the efficiency of cutting the pipe wall of the gas extraction pipe 7.
In one embodiment, as shown in fig. 3, the head end of the cutting head housing 31 has a tapered leading end 312 to facilitate guiding the hydraulic cutting head 3 in the gas extraction pipe 7.
In one embodiment, the water pipe 5 is connected to the end of the drill rod 2 by an adapter assembly 6.
The adapter assembly 6 comprises a water pipe connector 61 detachably connected with the water pipe 5 and a drill rod connector 62 detachably connected with the drill rod 2.
The drill rod connector 62 is connected with the water pipe connector 61 in a sealing mode, and the drill rod connector 62 can rotate relative to the water pipe connector 61.
In the embodiment, the adapter assembly 6 is adopted to connect the water pipe 5 and the drill rod 2, and when the drill rod 2 rotates, the water pipe 5 cannot twist.
The adapter assembly 6 includes a water coupling 61 and a drill pipe coupling 62. The water pipe connector 61 is in threaded connection with the water pipe 5, and the drill rod connector 62 is in threaded connection with the tail end of the drill rod 2.
An annular groove can be formed in the water pipe connector 61, a switching ring can be assembled on the drill rod connector 62, and the switching ring is in clearance fit in the annular groove, so that the drill rod connector 62 and the water pipe connector 61 can rotate relatively. When the drill rod connector 62 rotates along with the drill rod 2, the water pipe connector 61 and the water pipe 5 cannot rotate along with the drill rod, and therefore pipeline arrangement is convenient.
And a sealing ring is assembled between the adapter ring and the annular groove to realize sealing.
In one embodiment, the support base 4 comprises a base 41 and a support bracket 42 mounted on the base 41, the support bracket 42 having a support ring 43 for the drill rod 2 to pass through.
Two or more support frames 42 are mounted on the base 41 at intervals in the axial direction of the drill rod 2. The drill rod 2 passes through a support ring 43 on each support bracket 42.
The support ring 43 functions to support the drill rod 2, the support ring 43 having a diameter larger than that of the drill rod 2, and the drill rod 2 being rotatable and movable in the support ring 43.
In one embodiment, the top plate 411 of the base 41 extends obliquely upward in a direction from the trailing end to the leading end of the drill rod 2, so that the axial direction between the support rings 43 arranged in tandem extends obliquely and parallel to the axis of the gas extraction pipe 7. The drill rod 2 supported by the support ring 43 is also inclined in the same way as the gas extraction pipe 7, so that the drill rod 2 and the hydraulic cutting head 3 can be conveniently inserted into the gas extraction pipe 7.
As shown in fig. 5 to 6, the gas extraction pipe 7 is communicated between the first gateway 201 of the coal pillar and the return air gateway 101 of the working face. Wherein the gas extraction pipe 7 extends obliquely upward in a direction from the pillar first gateway 201 to the face return air gateway 101.
The embodiment of the invention provides a gas extraction pipe cutting method for cutting a gas extraction pipe 7 in a coal seam by adopting the hydraulic cutting device, which comprises the following steps:
s01: the extent of the second gate 202 of the pillar to be excavated is defined in advance.
S02: a hydraulic cutting device is placed in the first gateway 201 of the coal pillar, and the hydraulic cutting head 3 is inserted into the gas extraction pipe 7.
S03: the hydraulic cutting head 3 is moved by moving the drill pipe 2 into the range of the first gate 202 of the coal pillar to be dug.
S04: and starting the high-pressure water pump 1 and rotating the drill rod 2 to drive the hydraulic cutting head 3 to rotate in the gas extraction pipe 7, and performing annular cutting on the annular pipe wall of the gas extraction pipe 7 by using high-pressure water jetted from the nozzle 32.
S05: after the preset time, the high-pressure water pump 1 is stopped, the drill rod 2 is pulled backwards, the hydraulic cutting head 3 is driven to move to the next position within the range of the second gateway 202 of the coal pillar, and then cutting is performed according to the operation mode of the step S04.
S06: and repeating the step S05, and cutting the gas extraction pipe 7 in the range of the second gate way 202 of the coal pillar into a plurality of sections.
Namely: a range of the second gate 202 of the pillar to be excavated is previously defined in the pillar 200. A hydraulic cutting device is placed in the first gateway 201 of the coal pillar, and the hydraulic cutting head 3 is inserted into the gas extraction pipe 7. The hydraulic cutting head 3 is moved by moving the drill pipe 2 into the range of the first gate 202 of the coal pillar to be dug. After the range of the second coal pillar gate 202 is determined in advance, the distance between the boundary range of the second coal pillar gate 202 and the first coal pillar gate 201 and the moving range of the drill rod 2 can be determined. According to the depth of the drill rod 2 and the hydraulic cutting head 3 inserted into the gas extraction pipe 7, whether the hydraulic cutting head 3 is located in the boundary range of the second gateway 202 of the coal pillar can be determined.
After the hydraulic cutting head 3 is located in the boundary range of the second gateway 202 of the coal pillar and reaches a preset position, the high-pressure water pump 1 is started and the drill rod 2 is rotated to drive the hydraulic cutting head 3 to rotate in the gas extraction pipe 7, and high-pressure water jetted from the nozzle 32 performs annular cutting on the annular pipe wall of the gas extraction pipe 7.
After the preset time, the pipe wall at the position is cut, the high-pressure water pump 1 is stopped, the drill rod 2 is pulled backwards (tail end), the hydraulic cutting head 3 is driven to move to the next position behind in the range of the second gateway 202 of the coal pillar, and then the pipe wall at the position is cut.
And repeating the operation to cut the gas extraction pipe 7 in the range of the second gateway 202 of the coal pillar into a plurality of sections, so that the tunneling operation of the tunneling machine cannot be influenced.
In one embodiment, the method for cutting the gas extraction pipe 7 further includes step S07:
s07: and (3) plugging two ends of the gas extraction pipe 7, and injecting a high-water material into the gas extraction pipe 7.
The gas extraction pipe 7 including the uncut section and the cut section is made to be solid by filling or filling the gas extraction pipe 7 with a high-water material. When the heading machine is heading, the cut sections of the gas extraction pipes 7 within the range of the second coal pillar gate 202 are excavated, while the uncut sections of the gas extraction pipes 7 on the two sides of the second coal pillar gate 202 are solid, so that gas in the working face 100 region can be prevented from leaking into the second coal pillar gate 202.
In one embodiment, the high-pressure water pump 1 supplies high-pressure water containing diamond grains, and the high-pressure water containing diamond grains is ejected through the nozzle 32. The high-pressure water contains the carborundum by configuring the carborundum in a certain proportion in the water source, and the cutting of the pipe wall of the gas extraction pipe 7 is facilitated. The ratio of corundum to water can be set as desired.
The invention provides a hydraulic cutting device and a gas extraction pipe cutting method, wherein the design that a rolling bearing is arranged on the outer side of a shell of a cutting head is adopted, so that the hydraulic cutting head can rotate in a gas extraction pipe more quickly, the pipe wall of the gas extraction pipe is cut by the acting force of high-pressure water, the problem that the existing common cutting device is not easy to cut the inside of the gas extraction pipe is solved, the condition that gas in the gas extraction pipe explodes due to sparks generated during cutting is avoided, the operation is simple, convenient and quick, the cutting work of the gas extraction pipe in a coal seam is effectively realized, and convenience is brought to the excavation work of a small coal pillar crossheading (second crossheading of the coal pillar).
According to the needs, the above technical schemes can be combined to achieve the best technical effect.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
Claims (10)
1. A hydraulic cutting device for cutting a gas extraction pipe in a coal seam is characterized in that,
the hydraulic cutting device comprises a high-pressure water pump, a drill rod, a hydraulic cutting head and a supporting seat, wherein the drill rod is used for being inserted into a gas extraction pipe;
the drill rod is rotatably arranged on the supporting seat, and a drill rod through hole for water flow to pass through is formed in the center of the drill rod;
a rotary handle is arranged at the tail part of the drill rod;
a water pipe is connected between the water outlet of the high-pressure water pump and the drill rod through hole;
the hydraulic cutting head comprises a cutting head shell, a nozzle and a rolling bearing used for being supported between the cutting head shell and the gas extraction pipe;
the cutting head shell is internally provided with a water flow channel, the cutting head shell is detachably connected with the head end of the drill rod, and the water flow channel is communicated with the drill rod through hole;
the nozzle is mounted on the cutting head housing, the nozzle being in communication with the water flow passage;
the rolling bearing is sleeved on the cutting head shell.
2. The hydraulic cutting device of claim 1, wherein the cutting head housing is arranged with a plurality of the nozzles spaced axially apart.
3. The hydraulic cutting device as recited in claim 1 wherein the cutting head housing is arranged with a plurality of the nozzles spaced apart along a circumferential direction.
4. The hydraulic cutting device of claim 1, wherein the head end of the cutting head housing has a tapered leading end.
5. The hydraulic cutting device as claimed in any one of claims 1 to 4, wherein the water pipe is connected to the trailing end of the drill stem by an adapter assembly;
the adapter assembly comprises a water pipe connector detachably connected with the water pipe and a drill rod connector detachably connected with the drill rod;
the drilling rod connector with water piping connection head sealing connection, just the drilling rod connector can for water piping connection head rotates.
6. Hydraulic cutting device according to any of claims 1 to 4,
the supporting seat comprises a base and a supporting frame arranged on the base, and the supporting frame is provided with a supporting ring for the drill rod to pass through;
more than two support frames are arranged on the base at intervals along the axial direction of the drill rod;
the drill rod passes through the support ring on each support frame.
7. The hydraulic cutting device of claim 6, wherein the top plate of the base extends obliquely upward in a direction from the trailing end to the leading end of the drill rod.
8. A gas extraction pipe cutting method for cutting a gas extraction pipe in a coal seam by using the hydraulic cutting device as claimed in any one of claims 1 to 7, wherein the gas extraction pipe is communicated between a first gateway of a coal pillar and a return air gateway of a working face;
the gas extraction pipe extends upwards in an inclined mode in the direction from the first gateway of the coal pillar to the return air gateway of the working face;
the cutting method of the gas extraction pipe comprises the following steps:
s01: predefining a range of a second gateway of the coal pillar to be excavated;
s02: placing the hydraulic cutting device in a first gateway of the coal pillar, and inserting the hydraulic cutting head into the gas extraction pipe;
s03: moving the hydraulic cutting head to the range of a first gate of a coal pillar to be dug by moving the drill rod;
s04: starting the high-pressure water pump and rotating the drill rod to drive the hydraulic cutting head to rotate in the gas extraction pipe, and performing annular cutting on the annular pipe wall of the gas extraction pipe by using high-pressure water jetted from the nozzle;
s05: after the preset time, stopping the high-pressure water pump, pumping the drill rod backwards, driving the hydraulic cutting head to move to the next position in the range of the second gateway of the coal pillar, and cutting according to the operation mode of the step S04;
s06: and repeating the step S05, and cutting the gas extraction pipe in the range of the second gate way of the coal pillar into a plurality of sections.
9. The gas extraction pipe cutting method according to claim 8, further comprising a step S07:
s07: and plugging two ends of the gas extraction pipe, and injecting a high-water material into the gas extraction pipe.
10. The gas extraction pipe cutting method according to claim 8,
the high-pressure water pump supplies high-pressure water containing diamond grains, and the high-pressure water containing diamond grains is ejected through the nozzle.
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