CN114033315B - Protruding coal seam shield pressure relief hole inner drilling tool and hole outer sealing system thereof - Google Patents
Protruding coal seam shield pressure relief hole inner drilling tool and hole outer sealing system thereof Download PDFInfo
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- CN114033315B CN114033315B CN202111345667.1A CN202111345667A CN114033315B CN 114033315 B CN114033315 B CN 114033315B CN 202111345667 A CN202111345667 A CN 202111345667A CN 114033315 B CN114033315 B CN 114033315B
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- 238000005553 drilling Methods 0.000 title claims abstract description 92
- 238000007789 sealing Methods 0.000 title claims abstract description 46
- 239000003245 coal Substances 0.000 title claims abstract description 34
- 239000011148 porous material Substances 0.000 claims abstract description 86
- 239000002893 slag Substances 0.000 claims abstract description 69
- 238000007599 discharging Methods 0.000 claims abstract description 47
- 239000000428 dust Substances 0.000 claims abstract description 4
- 210000002445 nipple Anatomy 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000003818 cinder Substances 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance 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
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- 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
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
-
- 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
- E21B12/00—Accessories for drilling tools
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The application discloses a shield pressure relief hole inner drilling tool for a protruding coal seam and a hole outer sealing system thereof, wherein the hole inner drilling tool comprises a sieve hole drill bit, a plurality of sieve hole drill rods and a plurality of flow supply pipes; the outer diameter of the sieve pore drill rod is close to the diameter of the drill bit, and the outer wall of the sieve pore drill rod has a shield effect on drilling; the outer surface of the sieve pore drill rod is provided with a spiral groove or a spiral convex rib or a plane, slag discharging sieve pores are arranged along the spiral groove or the spiral convex rib or the plane, and the slag discharging sieve pores have pressure relief effect on the drill rod; the hole sealing dustproof component and the sliding inner closed pipe are used for sealing exposed sieve holes of the sieve hole drill rod outside the holes, so that gas flow, water flow or dust is prevented from leaking out through the sieve holes, and the sliding inner closed pipe also has the functions of centralizing and positioning the flow supply pipe. The drilling tool in the hole can be used for straight drilling or directional drilling, and once the internal slag discharging channel is blocked, the internal slag discharging channel can be dredged by rotating the flow supply pipe.
Description
Technical Field
The application relates to the technical field of coal mine gas extraction drilling, in particular to a shield protection pressure relief hole inner drilling tool for an outburst coal seam and an outer hole sealing system, which are used for construction of gas extraction drilling holes for the outburst coal seam and a soft and hard composite coal seam.
Background
The construction of the gas extraction drilling of the outburst coal seam has three problems to be solved: firstly, drilling jet holes, wherein power phenomena such as coal cannons and the like in holes commonly occur in the process of drilling the protruding coal seam, the wall of the drill holes is extremely easy to collapse, so that an outer slag discharging channel is intermittently blocked, gas overrun of the jet holes can be caused by intermittent blocking and dredging of the outer slag discharging channel, incomplete statistics is carried out, and the gas overrun caused by the protruding coal seam drilling jet holes accounts for 60-80% of the total gas overrun times; secondly, the deflection of the drill holes is serious, because the external deslagging channel needs enough geometric space, the diameter of the drill rod is smaller than the diameter of the drill bit by 20-50 mm, the deflection distance of the hundred-meter drill holes is as high as 15-20 m, and the final hole position is generally formed in the top plate or the bottom plate of the coal seam; thirdly, the drilling depth is limited, and the drilling depth is limited due to factors such as hole collapse, blockage of an external deslagging channel, deflection of the drilling and the like.
In order to solve the problem of drilling an outstanding coal seam, the inventor sequentially puts forward a drilling concept of protecting holes and releasing pressure after 2013 and designs a plurality of double-channel sieve pore drill rods, wherein patent numbers are ZL201310568692.5, ZL201810488587.3 and ZL201810488034.8 respectively, flow supply pipes are coaxially fixed with an outer rod body through supporting devices, a slag discharge channel is an annular inner slag discharge channel between the flow supply pipes and the outer rod body, the drill rods have a shield protection and pressure relief function on drilling surrounding rocks, but the patent also has certain defects in terms of structure and use, and the main appearance is as follows: firstly, the two ends of the inner pipe are coaxially fixed with the outer pipe of the drill rod through the supporting device, the coaxiality requirements on the outer pipe and the inner pipe are higher, the supporting device has a blocking effect on the coal cinder migration of the slag discharging channel, the slag discharging of the inner slag discharging channel is not favorable, and the blocking probability of the inner slag discharging channel is increased; secondly, the inner slag discharging channel is an annular slag discharging channel between the inner surface of the outer rod body and the outer surface of the flow supply pipe, the minimum geometric dimension of the annular slag discharging channel is reduced in a multiplied manner compared with the geometric dimension of the slag discharging channel with a circular diameter, so that the size of a slag inlet of a sieve hole on the outer rod body is also reduced in a multiplied manner, the pressure relief efficiency of slag discharging is influenced by too small slag discharging sieve holes, and the probability of locking a drill rod is increased; thirdly, as the outer rod body of the drill rod and the central flow supply pipe are fixed in an integrated structure, the drill rod has no disturbance crushing function on coal slag entering the inner slag discharge channel, and the coal slag is easy to bridge and block in the annular slag discharge channel with smaller size; fourth, for soft outburst coal seam, the drilling is easy to collapse and block after lifting the drill, resulting in the reduction of extraction effect, and a plurality of mining areas need to implement the through hole through the center of the drill rod to lower the guard hole sieve tube in the drill hole when lifting the drill, if the fixed type center-supply sieve pore drill rod is adopted, the guard hole sieve tube can not be lowered for the drill hole when lifting the drill because of the obstruction of the supporting device.
Disclosure of Invention
The application aims to solve the existing problems, provides an in-hole drilling tool for shield protection pressure relief of an outburst coal seam and an out-hole sealing system thereof, and aims to solve the problem of hole drilling of the outburst coal seam and improve the straightness of drilling, the depth of drilling and the quality of hole forming.
The technical scheme adopted for achieving the purpose is as follows:
the utility model provides a outstanding coal seam shield protects pressure relief downthehole drilling tool, includes sieve mesh drill bit, many sieve mesh drilling rods and many power supply pipe, the sieve mesh drilling rod outer wall is equipped with a plurality of slag discharging sieve meshes that run through the body of rod wall thickness, the sieve mesh drill bit is connected with first sieve mesh drilling rod screw thread, adopts screw thread to connect between the adjacent sieve mesh drilling rod, and a plurality of power supply pipe are connected and pass the hole of sieve mesh drilling rod and form the power supply flow channel that provides sediment air current or rivers to the sieve mesh drill bit, and the annular space between power supply pipe outward appearance and the sieve mesh drilling rod inner wall is interior sediment channel; the first flow supply pipe is connected to the rotary flow supply nipple of the sieve pore drill bit, the flow supply pipe at the rear end is inserted into the sliding inner closed pipe, and the sliding inner closed pipe is inserted into the inner hole of the sieve pore drill rod outside the drill hole.
Further, the sieve pore drill bit comprises a drill bit shell, one end of the drill bit shell is provided with a screw thread connected with a sieve pore drill rod, the other end of the drill bit shell is provided with a flow outlet hole, a rotary flow supply nipple is axially rotatably arranged in the drill bit shell along the sieve pore drill rod, one end of the rotary flow supply nipple is communicated with the flow outlet hole, and the other end of the rotary flow supply nipple is connected with a flow supply pipe; the drill bit shell is provided with a spiral groove and a sieve hole; and a supporting frame is arranged between the rotary flow supply nipple and the drill bit shell.
Further, male buckles and female buckles are arranged at two ends of the sieve pore drill rod, a spiral groove or a spiral convex rib or an axial plane is arranged on the outer surface of the sieve pore drill rod, and the slag discharging sieve pore is arranged along the spiral groove or the spiral convex rib or the axial plane. The center line of the slag discharging sieve pore points to the center of the cross section of the sieve pore drill rod or deviates to the rotating direction of the sieve pore drill rod, and the slag discharging sieve pore is a round hole, a diameter-variable round hole or a primary-secondary combined hole. The structural form and parameter quantity of the spiral grooves on the outer surface of the sieve pore drill rod and the slag discharging sieve pores are required to be optimally designed according to the size of the sieve pore drill rod, the strength of steel materials used and the geological conditions of the coal bed. In order to improve the slag gathering and crushing effects of the outer surface of the drill rod, the outer surface of the sieve mesh drill rod is provided with axial convex ribs or axial grooves.
Further, male buckles and female buckles are arranged at two ends of the flow supply pipe and are used for being connected with a flow supply short section of the sieve pore drill bit and an adjacent flow supply pipe; in order to improve the functions of internal disturbance slag crushing and slag conveying of the drill rod, the outer surface of the flow supply pipe is provided with a spiral groove or a spiral convex rib or a spiral blade or an axial convex rib.
Furthermore, no connecting device is arranged between the feed pipe in the drill hole and the sieve pore drill rod in the drill hole, torque can be applied to the feed pipe to enable the feed pipe and the sieve pore drill rod to rotate relatively, and the spiral groove or spiral convex rib on the outer surface of the feed pipe is utilized to dredge the inner slag discharge channel under the condition that the inner slag discharge channel is accidentally blocked.
An out-hole sealing system which is matched with an out-hole drilling tool in a projected coal seam shield pressure relief hole comprises a hole sealing dustproof component arranged at a drilling hole opening and a sliding type inner sealing pipe inserted into an inner hole of a sieve hole drill rod outside the drilling hole. The hole sealing dustproof assembly comprises a hole sealing device and a dustproof part, the hole sealing device comprises a hole sealing pipe arranged at a drilling opening, a single bag is wrapped on the outer wall of the hole sealing pipe and is inserted into the drilling opening, the dustproof part comprises a mounting cylinder and a dustproof brush arranged on the inner wall of the mounting cylinder, the hole sealing pipe and the mounting cylinder are connected into a whole, the mounting cylinder is positioned outside the drilling opening, and the sieve pore drill rods respectively penetrate through the central hole of the hole sealing pipe and the central hole of the mounting cylinder, and the dustproof brush is in contact fit with the sieve pore drill rods.
Further, the sliding type inner closed pipe comprises an outer pipe, an inner pipe and a support, the support enables the outer pipe and the inner pipe to be coaxial, the outer diameter of the outer pipe is equal to or smaller than the inner diameter of the sieve pore drill rod, and the inner diameter of the inner pipe is equal to or larger than the outer diameter of the flow supply pipe.
Further, the sliding inner sealing pipe is inserted into an inner hole of the sieve pore drill rod, and an outer pipe of the sliding inner sealing pipe seals slag discharging sieve pores exposed out of the sieve pore drill rod; the flow supply pipe is inserted into the inner pipe of the sliding inner closed pipe, and the flow supply pipe and the sieve pore drill rod are coaxially arranged. The length of the sliding type inner closed pipe is equal to or greater than the sum of the length of the guide rail of the drilling machine and the distance between the front clamp holder of the drilling machine and the roadway wall.
In order to facilitate the assembly and disassembly of the flow supply pipe, the tail part of the flow supply pipe can be exposed out of the tail part of the sieve mesh drill pipe for a certain distance after the sieve mesh drill pipes are butted.
When the drilling machine clamps the sieve mesh drill rod to drill, the flow supply pipe and the sieve mesh drill rod can synchronously rotate or can not synchronously rotate.
The application has the beneficial effects that:
1. the floating type flow supply pipe of the drilling tool does not need to be fixedly arranged coaxially with the sieve mesh drill rod, a supporting device is omitted, the processing technology is simple, the manufacturing cost is reduced, and compared with a fixed type central flow supply sieve mesh drill rod, the drilling tool disclosed by the application has the advantage that the blocking effect of the flow supply pipe supporting device on the migration of coal cinder in an inner slag discharging channel is avoided.
2. The flow supply pipe of the drilling tool can float in the center of the drill rod, the section of the inner slag discharging channel dynamically changes, bridging blockage of the slag discharging channel in the drill rod can be avoided, the diameter of the slag discharging sieve hole can be larger, and the sieve pore slag discharging effect is better.
3. The floating type flow supply pipe of the drilling tool has the disturbance crushing effect on large-diameter cinder particles in the cinder discharging channel of the drilling rod, so that the fluid cinder discharging is smoother; when the slag discharging channel in the drill rod is accidentally blocked, torque can be applied to the flow supply pipe to enable the flow supply pipe and the drill rod with sieve pores to rotate relatively, and the blocking section can be dredged by utilizing the spiral conveying function of the spiral groove or the spiral convex rib on the outer surface of the flow supply pipe, and the short-distance reciprocating suction and insertion of the flow supply pipe can also be used for dredging the blocking section.
4. The drill provided by the application has the advantages that the support device is not arranged between the flow supply pipe and the sieve pore drill rod, the inner sealing of the exposed sieve pores of the drill rod is facilitated, and the slag discharge wind flow or water flow dissipation is prevented.
5. The screen pipe of the lower guard hole is drilled downwards through the inner hole of the drilling tool more easily.
Drawings
FIG. 1 is a schematic view of a mesh drill bit of a drilling tool according to the present application
FIG. 2 is a schematic view of the structure of a mesh drill rod of the drilling tool of the present application;
FIG. 3 is a schematic view of the structure of the flow tube of the drilling tool of the present application;
FIG. 4 is a schematic view of the structure and connection of the drilling tool of the present application;
FIG. 5 is a schematic diagram of a hole sealing and dust preventing assembly of the drilling tool of the present application;
FIG. 6 is a schematic view of a sliding inner closed pipe structure of the drilling tool of the present application;
fig. 7 is a schematic view of the overall structure of the drilling tool and the out-hole closure system according to the present application.
Detailed Description
The application is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a structure of a mesh drill bit protruding out of a drilling tool in a coal seam shield pressure relief hole, wherein the mesh drill bit 1 comprises a drill bit shell 11, a support frame 12 and a rotatable flow supply nipple 13, the support frame 12 is coaxially fixed with the drill bit shell 11, the rotatable flow supply nipple 13 penetrates through a central hole of the support frame 12 and is coaxially arranged with the drill bit shell 11, and the rotatable flow supply nipple 13 can freely rotate in the support frame 12; the drill bit shell 11 is provided with a spiral groove 14, an axial sieve pore 15, a radial sieve pore 16 and a outflow hole 17, and the tail part of the drill bit shell 11 is provided with a female buckle for connecting with a sieve pore drill rod; one end of the rotatable flow supply nipple 13 is led to a flow outlet hole 17 at the terminal end of the sieve pore drill bit 1, and the other end of the rotatable flow supply nipple 13 is provided with a female buckle for connecting with a flow supply pipe.
Fig. 2 is a schematic structural view of a sieve pore drill rod 2 of the drilling tool, wherein male buckles and female buckles are arranged at two ends of the sieve pore drill rod 2 and are used for being connected with a sieve pore drill bit 1 and adjacent sieve pore drill rods 2; the outer surface of the sieve pore drill rod 2 is provided with a spiral groove 21 or a spiral convex rib or an axial plane, and slag leakage sieve holes 22 penetrating the wall thickness of the drill rod are arranged along the spiral groove 21 or the spiral convex rib or the axial plane; the center line of the slag discharging sieve hole 22 points to the center of the cross section of the sieve pore drill rod 2 or deviates to the rotation direction of the sieve pore drill rod 2, and the slag discharging sieve hole 22 is a round hole, a reducing round hole or a combined hole of a primary and secondary. The appearance structure form of the sieve pore drill rod 22, the parameters, the number and the like of the spiral grooves 21 and the slag discharging sieve holes 22 are required to be optimally designed according to the size of the slag discharging sieve holes 22, the strength of the steel materials and the geological conditions of the coal bed.
Fig. 3 is a schematic diagram of a flow supply pipe structure of the drilling tool of the present application, wherein male buckles 31 and female buckles 32 are arranged at two ends of the flow supply pipe 3, and are used for connecting with the mesh drill bit 1 and connecting with two adjacent flow supply pipes 3; in order to improve the internal disturbance slag crushing and conveying functions of the drill rod, the outer surface of the flow supply pipe 3 can be provided with spiral grooves 33 or spiral ribs or spiral blades or axial ribs, the shape and the number of the spiral grooves 33 or the spiral ribs or the spiral blades or the axial ribs on the outer surface of the flow supply pipe are not limited by the embodiment, and the flow supply pipe can be in the shape of a circular pipe, a polygonal pipe and the like.
Fig. 4 is a schematic diagram of the structure and connection of the drilling tool of the present application, wherein the hole drilling tool comprises a mesh drill bit 1, a plurality of mesh drill rods 2 and a plurality of flow supply pipes 3, the mesh drill bit 1 is connected with the first mesh drill rod 2 by screw threads, the subsequent mesh drill rods 2 are connected with the mesh drill rods 2 by screw threads, the flow supply pipes 3 are connected with the flow supply pipes 3, and the plurality of flow supply pipes 3 provide slag discharge air flow or water flow for the mesh drill bit 1 through the inner holes of the plurality of mesh drill rods 2; the central hole of the flow supply pipe 3 is a flow supply channel 4, and an annular gap between the outer surface of the flow supply pipe 3 and the inner wall of the sieve pore drill rod 2 is an inner slag discharge channel 5. No connecting device is arranged between the in-hole flow supply pipe 3 and the in-hole sieve pore drill rod 2, torque can be applied to the flow supply pipe 3 to enable the flow supply pipe 3 and the sieve pore drill rod 2 to rotate relatively, and the spiral groove 33 or the spiral convex rib on the outer surface of the flow supply pipe 3 is utilized to dredge the inner slag discharge channel 5 under the condition that the inner slag discharge channel 5 is accidentally blocked. In order to facilitate the assembly and disassembly of the flow supply pipe 3, the tail of the sieve pore drill rod 2 can be exposed out of the tail of the flow supply pipe 3 for a certain distance after the sieve pore drill rod 2 is connected.
In order to prevent gas flow, water flow or dust from leaking out through the exposed sieve pores of the sieve pore drill rod outside the hole to enable cinder to lose deslagging power, the external sealing system of the hole is required to be matched when the protruding coal seam shield pressure relief hole drilling tool is used, and the external sealing system of the hole comprises a hole sealing dustproof component 6 arranged at the opening of the drill hole and a sliding type internal sealing pipe 7 inserted into the inner hole of the sieve pore drill rod outside the drill hole.
Fig. 5 is a schematic diagram of a hole sealing and dustproof assembly structure of a hole of the drilling tool, the hole sealing and dustproof assembly 6 comprises a hole sealing device and a dustproof part, the hole sealing device comprises a hole sealing pipe installed at a hole drilling opening, the outer wall of the hole sealing pipe is wrapped with a single bag 61 and is inserted into the hole drilling opening, the dustproof part comprises a mounting cylinder and a dustproof brush 62 installed on the inner wall of the mounting cylinder, the hole sealing pipe and the mounting cylinder are connected into a whole, the mounting cylinder is positioned outside the hole drilling opening, the sieve pore drill rod 2 respectively penetrates through the center hole of the hole sealing pipe and the center hole of the mounting cylinder, and the dustproof brush 62 is in contact fit with the sieve pore drill rod 2. And (3) plugging the drill hole by using a hole sealing dustproof assembly 6 after the hole is drilled and reamed at the hole opening.
FIG. 6 is a schematic view of a sliding inner closed pipe structure used at an orifice of the drilling tool of the present application, wherein the sliding inner closed pipe 7 is composed of an outer pipe 71, an inner pipe 72 and a support 73, the support 73 keeps the outer pipe 71 and the inner pipe 72 coaxially fixed, and the number, the length and the shape of the support 73 are not limited by the embodiment; the outer diameter of the outer tube 71 is equal to or smaller than the inner diameter of the mesh drill rod 2, and the inner diameter of the inner tube 72 is equal to or larger than the outer diameter of the flow tube 3. The length of the sliding inner closed pipe 7 is equal to or greater than the sum of the length of the drill guide rail and the distance between the front gripper of the drill and the wall of the roadway.
The sliding inner sealing pipe 7 is inserted into the inner hole of the sieve pore drill rod 2, and the outer pipe 71 of the sliding inner sealing pipe 7 is utilized to seal the slag discharging sieve pore of the sieve pore drill rod 2 outside the drilled hole; the flow supply pipe 3 is inserted into the inner pipe 72 of the sliding inner closed pipe 7, and the flow supply pipe 3 is positioned at the coaxial center of the sieve mesh drill rod 2. The inner closed pipe 7 can slide in the inner hole of the sieve mesh drill rod 2, and the inner closed pipe is slid into the inner hole of the sieve mesh drill rod at the tail end after the drill rod is added each time along with the drilling; the sliding inner closed pipe 7 has the functions of closing the exposed sieve pores of the sieve pore drill rod 2 outside the hole and righting the flow supply pipe 3, and the flow supply pipe 3 and the sieve pore drill rod 2 are coaxial so as to be convenient for being connected with the flow supply pipe 3.
Fig. 7 is a schematic view of the overall structure of the drilling tool and the out-hole closure system according to the present application. The sieve pore drill bit 1 is connected with the first sieve pore drill rod 2 in a threaded manner, the adjacent sieve pore drill rods 2 are connected by threads, a plurality of flow supply pipes 3 are connected and penetrate through the inner holes of the sieve pore drill rods 2 to form a flow supply channel 4 for providing slag discharge airflow or water flow for the sieve pore drill bit 1, and an annular space between the outer surface of the flow supply pipe 3 and the inner wall of the sieve pore drill rod 2 is an inner slag discharge channel 5; the first flow supply pipe 3 is connected to the rotary flow supply nipple 13 of the sieve pore drill bit 1, the rear end flow supply pipe 3 is inserted into the sliding inner closed pipe 7, and the sliding inner closed pipe 7 is inserted into the inner hole of the sieve pore drill rod 2 outside the drill hole.
Because no connecting device is arranged between the flow supply pipe 3 and the sieve mesh drill rod 2 in the drilling, the flow supply pipe 3 and the sieve mesh drill rod 2 can synchronously rotate or can not synchronously rotate in the drilling construction process. Under the condition that the slag discharging channel 5 in the drill rod is accidentally blocked, torque can be applied to the flow supply pipe 3 to enable the flow supply pipe 3 and the sieve mesh drill rod 2 to rotate relatively, and the spiral groove 33 or the spiral convex rib on the outer surface of the flow supply pipe 3 is utilized to dredge the inner slag discharging channel 5.
The flow supply pipe 3 can float in the center of the drill rod, so that bridging blockage of coal slag in the slag discharging and discharging 5 in the drill rod can be avoided, the diameter of the slag discharging sieve hole 22 can be larger, and the sieve pore slag discharging effect is better; the floating type flow supply pipe 3 has the disturbance crushing function on large-diameter cinder particles in the cinder discharging channel 5 in the drill rod, and the fluid cinder discharging is more smooth.
The tail ends of the sieve pore drill rod 2 and the flow supply pipe 3 outside the drilling hole are respectively connected with the drill rod joint and the flow supply joint of the flow supply device.
The annular space between the inner surface of the mesh drilling rod 2 and the outer surface of the flow supply pipe 3 is an inner slag discharging channel 5 for discharging slag, coal slag particles are conveyed at high speed in the inner slag discharging channel 5, the flow supply pipe 3 floats and rubs in the inner hole of the mesh drilling rod 2, in order to ensure that the drilling tool can meet the requirements of fire retardation, static resistance, spark resistance and the like in the underground of a coal mine, the drilling tool is required to be processed by selecting materials meeting the use requirements in the underground of the coal mine, for example, the flow supply pipe 3 is processed by engineering plastics such as copper pipes or antistatic nylon pipes, or special materials are sprayed on the friction surface of the drilling tool or thin-wall tubes are inlaid to improve the use performance of the drilling tool, and the special treatment process changes of the drilling tool are also in the protection scope of the patent.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present application, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present application are all included in the scope of protection of the technical solution of the present application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (4)
1. The utility model provides a outstanding coal seam shield protects drilling tool in release hole which characterized in that, including sieve mesh drill bit, many sieve mesh drilling rods and many power supply pipe, the sieve mesh drilling rod outer wall is equipped with a plurality of slag discharge sieve meshes that run through the body of rod wall thickness, sieve mesh drill bit is connected with first sieve mesh drilling rod screw thread, adopts screw thread to connect between the adjacent sieve mesh drilling rod, and a plurality of power supply pipe are connected and pass the hole of sieve mesh drilling rod and form the power supply flow channel that provides slag discharge air current or rivers to sieve mesh drill bit, and the annular space between power supply pipe outward appearance and the sieve mesh drilling rod inner wall is interior slag discharge channel; the first flow supply pipe is connected to the sieve pore drill bit, the flow supply pipe at the rear end is inserted into the sliding inner closed pipe, and the sliding inner closed pipe is inserted into the inner hole of the sieve pore drill rod outside the drill hole;
the sieve pore drill bit comprises a drill bit shell, one end of the drill bit shell is provided with a screw thread connected with a sieve pore drill rod, the other end of the drill bit shell is provided with a flow outlet hole, a rotary flow supply nipple is axially rotatably arranged in the drill bit shell along the sieve pore drill rod, one end of the rotary flow supply nipple is communicated with the flow outlet hole, and the other end of the rotary flow supply nipple is connected with a flow supply pipe; the drill bit shell is provided with a spiral groove and a sieve hole; and a supporting frame is arranged between the rotary flow supply nipple and the drill bit shell.
2. The protruding coal seam shield pressure relief hole drilling tool according to claim 1, wherein male buckles and female buckles are arranged at two ends of the mesh drill rod, a spiral groove or a spiral convex rib or an axial plane is arranged on the outer surface of the mesh drill rod, and the slag discharging mesh is arranged along the spiral groove or the spiral convex rib or the axial plane.
3. The drilling tool in the pressure relief hole of the shield of the protruding coal seam of claim 1, wherein male buckles and female buckles are arranged at two ends of the flow supply pipe, and spiral grooves or spiral ribs are arranged on the outer surface of the flow supply pipe.
4. An out-of-hole closure system for installation with an out-of-hole drilling tool for a protruding coal seam shield pressure relief hole as defined in any one of claims 1-3, comprising a hole sealing and dust preventing assembly installed at the opening of the borehole and a sliding inner closure tube inserted into the inner hole of the mesh drill rod outside the borehole opening;
the hole sealing dustproof assembly comprises a hole sealing device and a dustproof part, the hole sealing device comprises a hole sealing pipe arranged at a drilling opening, a single bag is wrapped on the outer wall of the hole sealing pipe and is inserted into the drilling opening, the dustproof part comprises a mounting cylinder and a dustproof brush arranged on the inner wall of the mounting cylinder, the hole sealing pipe and the mounting cylinder are connected into a whole, the mounting cylinder is positioned outside the drilling opening, and the sieve pore drill rod respectively penetrates through the central hole of the hole sealing pipe and the central hole of the mounting cylinder, and the dustproof brush is in contact fit with the sieve pore drill rod;
the sliding type inner closed pipe comprises an outer pipe, an inner pipe and a support, the support enables the outer pipe and the inner pipe to be coaxial, the outer diameter of the outer pipe is equal to or smaller than the inner diameter of the sieve pore drill rod, and the inner diameter of the inner pipe is equal to or larger than the outer diameter of the flow supply pipe;
the sliding inner sealing pipe is inserted into the inner hole of the sieve pore drill rod, and the outer pipe of the sliding inner sealing pipe seals slag leakage sieve pores of the sieve pore drill rod exposed outside the drilling hole; the flow supply pipe is inserted into the inner pipe of the sliding inner closed pipe, and the flow supply pipe and the sieve pore drill rod are coaxially arranged.
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| CN202111345667.1A CN114033315B (en) | 2021-11-15 | 2021-11-15 | Protruding coal seam shield pressure relief hole inner drilling tool and hole outer sealing system thereof |
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| CN202111345667.1A CN114033315B (en) | 2021-11-15 | 2021-11-15 | Protruding coal seam shield pressure relief hole inner drilling tool and hole outer sealing system thereof |
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| CN115059497A (en) * | 2022-03-28 | 2022-09-16 | 重庆大学 | Hole protecting system and method for coal seam cutting and pressing combined extraction |
| CN115045640B (en) * | 2022-06-27 | 2024-03-22 | 中煤科工集团西安研究院有限公司 | Device and method for penetrating through borehole and opposite-pulling lower screen pipe |
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