CN113062687B - Combined drilling tool with self-sealing hole function - Google Patents
Combined drilling tool with self-sealing hole function Download PDFInfo
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- CN113062687B CN113062687B CN202110424235.3A CN202110424235A CN113062687B CN 113062687 B CN113062687 B CN 113062687B CN 202110424235 A CN202110424235 A CN 202110424235A CN 113062687 B CN113062687 B CN 113062687B
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- hole
- drill bit
- sealing device
- hole sealing
- rod
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- 238000007789 sealing Methods 0.000 title claims abstract description 135
- 238000005553 drilling Methods 0.000 title claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 16
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims description 15
- 239000000498 cooling water Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 description 32
- 238000000034 method Methods 0.000 description 16
- 210000004907 gland Anatomy 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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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
- E21B7/00—Special methods or apparatus for drilling
-
- 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
- E21B10/00—Drill bits
-
- 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
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/006—Accessories for drilling pipes, e.g. cleaners
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a combined drilling tool with a self-sealing hole function, which comprises a power positioning drill rod, a combined drill bit and a hole sealing device, wherein the combined drill bit is arranged at a first end of the power positioning drill rod, the hole sealing device is a cylindrical barrel, the combined drill bit and the power positioning drill rod are arranged in the hole sealing device in a penetrating way, the front end of the combined drill bit extends out of a port of the hole sealing device, a gap for coal water slag to pass through is formed between the combined drill bit and the port of the hole sealing device, a cutting piece which is arranged in a surrounding way is formed at the port of the hole sealing device, an inner taper hole is formed at the port of the other end of the hole sealing device, and a flange buckle is arranged at the inner side of the inner taper hole.
Description
Technical Field
The invention belongs to the technical field of hole sealing of drilling and particularly relates to a combined drilling tool with a self-sealing hole function.
Background
In the underground drilling construction process of the coal mine, the hole is required to be sealed, so that the collection of coal water slag in the construction process and the gas leakage are avoided. The hole sealing devices in the prior art are mainly two types, one type is that the hole sealing device is formed by drilling holes on a rock arm, reaming after drilling, plugging an expandable hollow hole sealing device after reaming for a certain distance, and then drilling a drilling tool through the hole sealing device for construction and drilling, wherein the method has the problems that the drilling tool is difficult to replace in the use process, the hole sealing device is completely manually installed and detached, potential safety hazards exist, the operation is difficult, and the like; the other is to arrange a rubber sealing body with compressible property in front of the drilling machine, and to realize hole sealing by directly pushing the sealing body against the rock wall. The hole sealing mode is simple to operate, but poor in hole sealing effect, and high in requirement on rock wall, and if the rock wall is uneven and has large fluctuation, the hole sealing effect is poor.
Disclosure of Invention
The invention aims to solve the problems of difficult hole sealing, low hole sealing efficiency and the like in underground drilling construction, and provides a combined drilling tool with a self-hole sealing function.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a combination drilling tool with from hole sealing function, includes power location drilling rod, combination drill bit and hole sealing device, the first end at power location drilling rod is installed to the combination drill bit, hole sealing device is a cylinder barrel, and combination drill bit and power location drilling rod wear to establish in hole sealing device, and the front end of combination drill bit stretches out hole sealing device's port is formed with the clearance that is used for coal cinder to pass through between combination drill bit and hole sealing device's port to be formed with the cutting piece that encircles the setting in this port department of hole sealing device, be formed with interior taper hole in hole sealing device's the other end port department.
According to the scheme, the hole sealing device is provided with an annular groove along the outer surface of the cylinder body.
According to the scheme, the combined drill bit is a multi-stage drilling drill bit and comprises a centering drill bit and a crushing drill bit, an inner conical wire hole is formed in one end of the crushing drill bit and is connected with an outer conical wire head of a first end of a dynamic positioning drill rod, and the centering drill bit is installed at the center of the end part of the crushing drill bit.
According to the scheme, a water outlet hole for discharging cooling water is formed in the crushing drill bit, the water outlet hole is located on the conical surface of the crushing drill bit, and the water outlet hole is communicated with the central channel of the dynamic positioning drill rod through a pore canal.
According to the scheme, a support block structure is arranged on a rod body, close to the first end, of the dynamic positioning drill rod, and the outer edge of the support block structure is in contact with the inner wall of the hole sealing device; the supporting block structure comprises a plurality of supporting blocks which are arranged around a rod body of the dynamic positioning drill rod and are in central symmetry, and cutting pieces are arranged on the end face of one side of the supporting blocks, which faces the direction of the combined drill bit.
According to the scheme, the plug hole is formed in the end face of the second end of the dynamic positioning drill rod, the cross section of the plug hole is square, and the limiting hole is formed in the inner side wall of the plug hole.
Further improve this scheme, the interior taper hole inboard is provided with the flange buckle, be provided with on the dynamic positioning drilling rod body with the support buckle that the flange buckle matches.
Further improve this scheme, hole sealing device's interior taper hole one end is connected with the collecting box, the box lateral wall of collecting box is provided with the seal mouth with interior taper hole butt joint.
Further improve this scheme, the top of collecting box is provided with the last interface that is used for gas drainage, and its bottom is provided with the lower interface that is used for coal water to discharge.
Advantageous effects
According to the invention, compared with the prior art, through innovation, the hole sealing process is simpler, the hole opening, hole expanding and hole sealing of the orifice are completed at one time, the operation is simple, the hole sealing time is effectively saved, the hole sealing efficiency is high, and the labor intensity of workers is low. The specific analysis is as follows: the device mainly comprises a power positioning drill rod, a combined drill bit, a hole sealing device and the like, wherein a support block structure is arranged on a rod body of the power positioning drill rod, which is close to one end of the drill bit, and a uniformly distributed three-wing form is adopted to improve the rigidity of the hole sealing device during rotary pushing, the hole sealing device is arranged into a thin-wall sleeve type structure, a cutting piece is welded at one end of entering rock, the rock can be cut during rotary pushing of the hole sealing device, and a support buckle of the power positioning drill rod is matched with a flange buckle structure of the sealing device for transmitting torque and pulling force to the hole sealing device by the power positioning drill rod.
Secondly, in order to improve the sealing effect of the hole sealing device and the drilling hole, the outer surface of the hole sealing device is provided with the annular groove, and rock scraps generated in the process of cutting the rock stratum can be piled up between the outer wall of the hole sealing device and the inner hole of the drilling hole to form the seal between the outer wall of the hole sealing device and the inner wall of the drilling hole, so that water and gas are prevented from leaking out from the joint surface. Meanwhile, the friction force between the hole sealing device and the rock hole can be increased by rock powder generated when the sleeve cuts the rock, so that the effect of fixing the hole sealing device is achieved.
Thirdly, according to the drilling tool, in order to avoid damage to the hole sealing device caused by overlarge swing in the drilling process, the front end of the combined drill bit is provided with the centering drill bit, and when rock stratum drilling is carried out, the centering drill bit is used for cutting rock, so that centering of the drilling tool is realized.
Fourthly, in order to ensure the cooling of the drilling tool, the conical surface of the crushing drill bit is provided with a cooling water outlet hole, so that cooling water introduced from the center of the dynamic positioning drill rod can be introduced to the forefront end of the drilling tool to cool the drilling tool.
Fifthly, in order to ensure the collection of the coal water slag in the construction process and avoid the leakage of the gas, the invention is provided with a collection box, the coal water slag generated in the drilling process is collected, the collected coal water slag is drained to a coal water slag treatment device through a pipeline, and the gas is pumped to an external negative pressure pipe.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a longitudinal section view of a hole sealing device of a composite drilling tool of the present invention;
FIG. 2 is a schematic cross-sectional view of the support clasp and flange clasp of the present invention;
FIG. 3 is an internal structural view of the collecting tank in the present invention;
FIG. 4 is a diagram showing the operation of the composite drilling tool according to the present invention;
the marks in the figure: 1. the dynamic positioning drill rod comprises 1-1 parts of a supporting block, 1-2 parts of a plug hole, 1-3 parts of a limiting hole, 1-4 parts of an outer conical head, 1-5 parts of a supporting buckle, 1-6 parts of a water inlet channel, 2 parts of a combined drill bit, 2-1 parts of a centering drill bit, 2-2 parts of a crushing drill bit, 2-3 parts of a water outlet hole, 3 parts of a hole sealing device, 3-1 parts of a cutting piece, 3-2 parts of an inner conical hole, 3-3 parts of a flange buckle, 3-4 parts of an annular groove, 4 parts of a collecting box, 4-1 parts of a first box, 4-2 parts of a second box, 4-3 parts of a sealing port, 4-4 parts of a sealing body, 4-5 parts of a fixing clamping groove, 4-6 parts of a flushing preventing plate, 4-7 parts of an upper interface, 4-8 parts of a lower interface.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The preferred embodiments of the present invention will be described in detail below. As shown in fig. 1, this embodiment provides a composite drilling tool with self-sealing hole function, including a power positioning drill rod 1, a composite drill bit 2 and a hole sealing device 3, wherein the composite drill bit 2 is installed at a first end of the power positioning drill rod 1, the hole sealing device 3 is a cylindrical barrel, the composite drill bit 2 and the power positioning drill rod 1 are arranged in the hole sealing device 3 in a penetrating way, the front end of the composite drill bit 2 extends out of a port of the hole sealing device 3, and a gap for coal water slag to pass through is formed between the composite drill bit 2 and the port of the hole sealing device 3.
The power positioning drill rod 1 is a drilling tool for transmitting torque and pushing and pulling force to the hole sealing device 3 and the combined drill bit 2, and comprises a front end screw thread, a rear end-shaped inserting hole 1-2, a supporting block structure, a buckling structure and a rod body. The outer cone thread head 1-4 at the front end of the rod body is connected with the inner cone thread hole at the tail end of the drill bit, and transmits the rotating speed, torque and pushing and pulling force required by rock cutting to the combined drill bit 2. One end of the power positioning drill rod 1 is of a square plug-in structure, is connected with a drilling tool at the power output end of a drilling machine, transmits torque and push-pull force, and can realize forward and reverse rotation of the power positioning drill rod 1 body by adopting the square plug-in structure. The other end is connected with the combined drill bit 2 to drive the crushing drill bit 2-2 to cut rock mass.
As shown in fig. 2, the outer side of the rod body of the dynamic positioning drill rod 1 is provided with a supporting block structure, and the supporting block structure adopts a uniformly distributed three-wing form to improve the rigidity of the hole sealing device when the hole sealing device 3 is rotationally pushed, the outer side of the rod body of the dynamic positioning drill rod 1 is provided with two groups of supporting structures, and one end supporting structure which is closer to the crushing drill bit 2-2 is provided with three uniformly distributed supporting blocks 1-1, uniformly surrounds the dynamic positioning drill rod 1 and is centrally and symmetrically distributed. Wherein, one end of the supporting block 1-1, which is close to the crushing drill bit 2-2, is welded with a cutting piece, so that the rock slag with larger volume can be crushed continuously, and slag discharge is smoother. The support structure far away from one end of the crushing drill bit 2-2 is also composed of three uniformly distributed support blocks, wherein the support blocks are provided with support buckles 1-5 connected with flange buckles 3-3 of the hole sealing device 3, after the power positioning drill rod 1 enters the hole sealing device 3, the drill rod is rotated, so that the support buckles 1-5 of the power positioning drill rod 1 are matched with the flange buckles 3-3 of the hole sealing device 3, and the power positioning drill rod 1 drives the hole sealing device 3 to rotate and move forwards and backwards.
Specifically, a plug hole 1-2 is formed on the end face of the second end of the dynamic positioning drill rod 1, and the cross section of the plug hole 1-2 is square. The inner side wall of the plug hole 1-2 is provided with a limit hole 1-3. The square splicing structure at the rear end of the rod body is connected with a rear end drilling tool, the drilling tool transmits the rotating speed, the torque and the pushing and pulling force generated by the power output device to the power positioning drill rod 1, and then the power positioning drill rod 1 drives the hole sealing device 3 and the combined drill bit 2 to work. The square plug structure comprises an inner square plug hole 1-2 and a limit hole 1-3, wherein the plug hole 1-2 is used for transmitting torque, and the limit hole 1-3 is used for transmitting pulling force.
The hole sealing device 3 is of a thin-wall sleeve type structure, a cutting piece 3-1 is welded at one end of the hole entering the rock, the rock can be cut when the hole sealing device 3 is rotationally pushed, and the size of a drilled hole after cutting is slightly larger than that of the outer wall of the hole sealing device 3. The annular groove 3-4 is formed in the outer side wall of the hole sealing device 3, and rock fragments generated in the process of cutting rock mass by the cutting blade 3-1 can be accumulated between the outer wall of the hole sealing device 3 and the inner hole of the drill hole to form a seal between the outer wall of the hole sealing device 3 and the inner wall of the drill hole, so that water and gas are prevented from leaking out from the joint surface. The coal water slag and gas generated in the drilling process form effective sealing when entering the collecting box 4, and the friction force between the hole sealing device 3 and the rock holes can be increased by rock powder generated when the sleeve cuts the rock.
The hole sealing device 3 is far away from drill bit one end and is interior taper hole 3-2 of interior taper structure, can form effective seal with the conical structure of collection box 4 front end, reaches the effect of fixed hole sealing device 3, and the interior taper hole 3-2 inboard of hole sealing device 3 sets up flange buckle 3-3 simultaneously. Can be connected with a supporting buckle 1-5 at the second end of the dynamic positioning drill rod 1, and the dynamic positioning drill rod 1 transmits torque and pulling force to the hole sealing device 3.
The drill bit 3 is in threaded connection with the front end of the dynamic positioning drill rod 1, the combined drill bit 2 is a multi-stage drilling drill bit and comprises a centering drill bit 2-1 and a crushing drill bit 2-2, one end of the crushing drill bit 2-2 is provided with an inner conical thread hole and is connected with an outer conical thread head 1-4 of the first end of the dynamic positioning drill rod 1, the other end of the crushing drill bit 2-2 is provided with a round table-shaped end head, and the centering drill bit 2-1 is arranged at the center of the end part of the round table-shaped end head. When the rock stratum is drilled, the centering drill bit 2-1 is used for cutting rock, so that the centering of a drilling tool is realized, and the damage of the hole sealing device 3 caused by overlarge swing in the drilling process is avoided. To ensure that the drill bit front has been centred before the hole sealing device 3 contacts the rock, the centring drill bit 2-1 is exposed to the hole sealing device 3 for a certain distance. Cutting blades are welded on the cylinder of the breaking bit 2-2 for cutting rock to form a borehole.
In order to ensure the cooling of the drilling tool, a water outlet hole 2-3 for discharging cooling water is formed in the crushing drill bit 2-2, the water outlet hole 2-3 is positioned on the conical surface of the crushing drill bit 2-2, and the water outlet hole 2-3 is communicated with a water inlet channel 1-6 of the dynamic positioning drill rod 1 through a pore canal. The front end of the crushing drill bit 2-2 is provided with a water outlet hole 2-3 for cooling water to be discharged, so that the cooling water which is introduced from the water inlet channel 1-6 of the dynamic positioning drill rod 1 can be introduced to the forefront end of the drilling tool to cool the drilling tool. When the dynamic positioning drill rod 1 rotates, the combined drill bit 2 is driven to cut rock, and a certain gap exists between the crushing drill bit 2-2 and the inner wall of the hole sealing device 3 for slag discharge.
The tail end of the hole sealing device 3 is further provided with a collecting box 4 for collecting coal water and gas, the side wall of the collecting box 4 is provided with a sealing opening 4-3, an inner conical hole 3-2 of the hole sealing device 3 is in tight contact with a conical head of the sealing opening 4-3, the collecting box 4 comprises a first box body 4-1 and a second box body 4-2, one sides of the first box body 4-1 and the second box body 4-2 are hinged, the side walls adjacent to the hinged sides are respectively provided with an upper clamping groove and a lower clamping groove, the first box body 4-1 and the second box body 4-2 are rotatably closed to form a box body buckled up and down, the upper clamping groove and the lower clamping groove are in butt joint to form a fixing clamping groove 4-5, the sealing body 4-4 is used for being fixed on the outer side wall of the box body, the sealing opening 4-3 is arranged on the upper box body 4-1 or the lower box body 4-2 and is positioned on the side wall opposite to the fixing clamping groove 4-5, the top of the upper box body 4-1 is provided with an upper interface 4-7, the bottom of the lower box body 4-2 is provided with a fixing interface 4-8, and the bottom of the box body 4-2 is provided with a fixing interface 4-8 through the fixing interface 4-8. The sealing body 4-4 can cover the drill rod when the outer diameter of the drill rod is in any shape, so that the drill rod can be sealed in the drilling process, the upper part and the lower part of the box body are separated, the installation and the disassembly of the sealing body 4-4 can be facilitated, and the cleaning of the interior of the box body is facilitated. If small spray holes appear in the drilling process, the mixture such as coal water gas sprayed from the holes is flushed on the impact-resistant plate 4-6, the impact force on the sealing body 4-4 is reduced, the coal water slag flows into the lower connector 4-8 after the impact force is eliminated by the impact-resistant plate 4-6, and the gas is pumped away by the upper connector 4-7. Specifically, this scheme not only can be applicable to circular drilling rod, still applicable dysmorphism drilling rod and triangular drilling rod etc. can directly pass collecting box 4 with the drilling tool when reaming, can directly open box upper half and change when changing seal body 4-4, easy operation, sealed effectual.
During drilling construction, the drilling tool is firstly installed on the power output device, the power positioning drill rod 1 is connected with the drilling tool, and the limiting pin is installed in the limiting hole 1-3. And then the hole sealing device 3 is arranged on the power positioning drill rod 1, the hole sealing device 3 is rotated to enable the buckle to be buckled, and the power output device can be rotated and pushed at the same time to enable the combined drilling tool to cut rock. And cooling water is introduced in the drilling process to cool the drilling tool. After the drilling hole is drilled to a certain distance or the annular groove 3-4 of the hole sealing device 3 enters the rock completely, the drilling operation is completed, the power output device reversely rotates the drilling tool, so that the power positioning drilling rod 1 and the hole sealing device 3 are buckled and disconnected, the power positioning drilling rod 1 is pulled out, the hole drilling operation and the hole sealing device 3 are installed once, the power positioning drilling rod 1 is replaced by a conventional drilling tool, the conical surface of the collecting device at the front end of the drilling machine and the conical structure at the tail end of the hole sealing device 3 are tightly propped, the hole sealing operation is completed, the equipment can normally drill holes, coal water slag enters from a gap between the combined drilling bit 2 and the hole sealing device 3, enters the collecting box 4 from the joint of the other end of the hole sealing device 3 and the sealing port 4-3, and coal water recovery and gas extraction are performed.
In order to enable the device to have a better effect, the scheme is further optimized, a cutting piece is welded to the end supporting structure far away from the square inserting hole 1-2 and faces the rock direction, rock fragments generated by cutting of the front crushing drill bit 2-2 can be continuously crushed, and slag discharge is facilitated. Secondly, for being applicable to the drilling rod of different shapes, can set up following structure: the seal body is a combined rotary structure and comprises a supporting ring, a rotary mechanism and a flexible sealing part, wherein the flexible sealing part is positioned at the central position of the supporting ring and can rotate relative to the supporting ring, the rotary mechanism comprises a front gland, a rear gland and a rotary bearing, an outer ring of the rotary bearing is fixedly connected with an inner ring boss of the supporting ring, the front gland and the rear gland are clamped on an inner ring of the rotary bearing, the outer edge of the central sealing part is fixed between the front gland and the rear gland, and the front gland and the rear gland are fixedly connected through bolts. And a shock absorption frame is arranged outside the supporting ring. When the flexible sealing part adopts the rubber, the middle through hole of the rubber is in the shape of the penetrated drill rod, and the size of the through hole is smaller than the outer diameter of the drill rod; the flexible sealing part is preferably rubber leather or a brush, and is fixed through the pressing covers at the two sides, and only the pressing covers at the two sides are required to be disassembled when the flexible sealing part is replaced. The flexible sealing part rotates along with the drill rod of the drilling tool under the drive of the drill rod, so that coal water slag generated in the drilling process cannot flow out from a gap between the flexible sealing part and the drill rod, the clean and tidy site construction is ensured, and gas leakage from the position is avoided.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The utility model provides a combination drilling tool with self-sealing hole function, includes power location drilling rod (1), combination drill bit (2) and hole sealing device (3), the first end at power location drilling rod (1), its characterized in that are installed to combination drill bit (2): the hole sealing device (3) is a cylindrical barrel, the combined drill bit (2) and the dynamic positioning drill rod (1) are arranged in the hole sealing device (3) in a penetrating mode, the front end of the combined drill bit (2) extends out of a port of the hole sealing device (3), a gap for coal water slag to pass through is formed between the combined drill bit (2) and the port of the hole sealing device (3), a cutting piece (3-1) which is arranged in a surrounding mode is formed at the port of the hole sealing device (3), and an inner taper hole (3-2) is formed at the port of the other end of the hole sealing device (3); the hole sealing device (3) is provided with an annular groove (3-4) along the outer surface of the cylinder body.
2. The composite drilling tool with the self-sealing function as recited in claim 1, wherein: the combined drill bit (2) is a multi-stage drilling drill bit and comprises a centering drill bit (2-1) and a crushing drill bit (2-2), wherein an inner conical wire hole is formed at one end of the crushing drill bit (2-2), the inner conical wire hole is connected with an outer conical wire head (1-4) at the first end of a power positioning drill rod (1), and the centering drill bit (2-1) is installed at the center of the end part of the crushing drill bit (2-2).
3. The composite drilling tool with the self-sealing function as claimed in claim 2, wherein: the crushing drill bit (2-2) is provided with a water outlet hole (2-3) for discharging cooling water, the water outlet hole (2-3) is positioned on the conical surface of the crushing drill bit (2-2), and the water outlet hole (2-3) is communicated with a water inlet channel (1-6) of the dynamic positioning drill rod (1) through a pore canal.
4. The composite drilling tool with the self-sealing function as claimed in claim 2, wherein: a support block structure is arranged on a rod body, close to the first end, of the dynamic positioning drill rod (1), and the outer edge of the support block structure is in contact with the inner wall of the hole sealing device (3); the supporting block structure comprises a plurality of supporting blocks (1-1) which are arranged around a rod body of the dynamic positioning drill rod (1) and are centrosymmetric, and cutting pieces are arranged on the end face of one side of the supporting block (1-1) facing the direction of the combined drill bit (2).
5. The composite drilling tool with the self-sealing function as claimed in claim 2, wherein: the end face of the second end of the dynamic positioning drill rod (1) is provided with a splicing hole (1-2), and the cross section of the splicing hole (1-2) is square; limiting holes (1-3) are formed in the inner side walls of the plug holes (1-2).
6. The composite drilling tool with the self-sealing function as claimed in claim 2, wherein: the inner side of the inner taper hole (3-2) is provided with a flange buckle (3-3), and the rod body of the dynamic positioning drill rod (1) is provided with a support buckle (1-5) matched with the flange buckle (3-3).
7. The composite drilling tool with the self-sealing function as recited in claim 6, wherein: one end of an inner taper hole (3-2) of the hole sealing device (3) is connected with a collecting box (4), and a sealing hole (4-3) which is in butt joint with the inner taper hole (3-2) is formed in the side wall of the box body of the collecting box (4).
8. The composite drilling tool with the self-sealing function according to claim 7, wherein: the top of the collecting box (4) is provided with an upper interface (4-7) for gas drainage, and the bottom of the collecting box is provided with a lower interface (4-8) for coal water drainage.
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