CN111042792A - Deep drilling longitudinal joint cutting device and method - Google Patents
Deep drilling longitudinal joint cutting device and method Download PDFInfo
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- CN111042792A CN111042792A CN202010034946.5A CN202010034946A CN111042792A CN 111042792 A CN111042792 A CN 111042792A CN 202010034946 A CN202010034946 A CN 202010034946A CN 111042792 A CN111042792 A CN 111042792A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 144
- 238000005553 drilling Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 91
- 239000010432 diamond Substances 0.000 claims abstract description 91
- 230000005540 biological transmission Effects 0.000 claims abstract description 53
- 239000003245 coal Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 77
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 239000011435 rock Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 13
- 229910052744 lithium Inorganic materials 0.000 claims description 13
- 208000032370 Secondary transmission Diseases 0.000 claims description 11
- 208000032369 Primary transmission Diseases 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000009958 sewing Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 6
- 238000005065 mining Methods 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
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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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
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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
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
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- Mining & Mineral Resources (AREA)
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- Fluid Mechanics (AREA)
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- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention belongs to the technical field of coal mining and mine pressure prevention, and discloses a drilling deep longitudinal joint-cutting device, wherein small-sized explosion-proof motors arranged in a drill bit are all arranged inside a head section of a hollow drill rod, a power supply device of the drilling deep longitudinal joint-cutting device is electrically connected with the small-sized explosion-proof motors arranged in the drill bit so as to supply power to the small-sized explosion-proof motors arranged in the drill bit, an installation clamping plate is arranged at the end face of the head of the hollow drill rod, a diamond saw blade is arranged in the installation clamping plate through a transmission shaft, part of outer edges of the diamond saw blade protrude out of the installation clamping plate, the diameter of the diamond saw blade is larger than that of the hollow drill rod, a motor; the tail part of the hollow drill rod is also provided with an operation assembly for controlling the hollow drill rod, and a small explosion-proof motor arranged in the drill bit can supply power through an external cable or a built-in battery. The invention also provides a longitudinal slitting method for the deep part of the hole.
Description
Technical Field
The invention belongs to the technical field of coal mining and mine pressure prevention and control, and particularly relates to a longitudinal joint cutting device and method for a deep roof position of a coal mine underground drill hole.
Background
The coal mining process is accompanied by the movement of overlying strata, which is often controlled by a hard roof above the coal seam. After the working face is pushed, if the hard top plate cannot be collapsed in time, a large-area cantilever is formed behind the working face or on two sides of a roadway, stress concentration and large deformation of surrounding rocks of the working face and the roadway are often caused by the existence of the cantilever, great difficulty is brought to supporting, and a good control effect on the surrounding rocks cannot be achieved by adopting various supporting means; therefore, effective manual intervention is carried out on the breakage and collapse of the hard top plate, and the top plate cantilever is cut off, which is always the key attack and customs research direction of the mine pressure control technology. The common hard roof treatment technologies at present include blasting roof cutting, mechanical sawing roof cutting, conventional hydraulic fracturing, transverse grooving hydraulic fracturing, longitudinal grooving hydraulic fracturing and the like.
Blasting roof cutting is used as a gob-side entry retaining pressure relief technology and can play a role in cutting a top plate cantilever, however, the construction procedure is complex, the blasting drilling interval is generally about 600mm, the construction cost is high, and the safety is poor; the KLJ type mining intelligent chain arm saw top cutting machine independently developed by the same coal group can realize mechanical cutting of a direct roof, has smooth section and good top cutting effect, but the maximum depth can only reach 6.6m at present, and the cutting of an upper hard old roof can not be realized temporarily; the conventional hydraulic fracturing is popularized and applied at home and abroad as an economic and effective hard and undisrupted roof treatment technology, but the expansion path of the fracture cannot be effectively controlled, the subjectivity of drilling construction design is large, the initial roof caving engineering amount of the hydraulic fracturing of a working face is large, and the roof cutting and pressure relief effect of a roadway is not obvious; in order to realize crack cracking and further realize effective control on crack expansion, a directional hydraulic fracturing technology is generally adopted, namely two artificial cracks are manufactured on the wall of a hydraulic fracturing drill hole, so that the cracking and expansion directions of the hydraulic fracturing crack are guided, two directional hydraulic fracturing modes of transverse grooving hydraulic fracturing and longitudinal grooving hydraulic fracturing are adopted at present, and compared with the transverse grooving hydraulic fracturing, the guide crest cutting direction of the crack is more beneficial to roof collapse.
Compared with a small-aperture pneumatic double-blade longitudinal grooving drill bit for grooving in a hole, the small-aperture pneumatic double-blade longitudinal grooving drill bit for grooving in the hole adopts a rear-end rotary machine positioned outside a drilled hole as a power source, the transmission rod arranged in the drill rods is used for long-distance transmission, the transmission gears in the drill rods are required to be fully meshed, the requirement on connection precision is high, the operation flow and the transmission structure are complex, the transmission efficiency is low, a single section of drill rod is heavy and is easy to rust and damage, once a certain drill rod is in transmission, each drill rod is required to be checked to find out the transmission damage position, the drill rod is not suitable for ultra-far distance control of the deep part of the drilled hole, the problems of cutter non-rotation, cutter clamping, cutter bending and the like often occur, grooving is very difficult, and the long-distance effective longitudinal.
Compared with a pre-crack hydraulic fracturing roof-cutting pressure-relief construction method and a drilling machine, the pre-crack hydraulic fracturing roof-cutting pressure-relief construction method and the grooving drilling machine of the drilling machine adopt a radial transmission small-size connecting rod with a built-in micro motor to drive a spiral point drilling tool to rotate, the motor is small in size and low in power due to the size limitation of the radial transmission connecting rod, the efficient drilling of hard rock walls such as sandstone cannot be realized, the grooving time is long, the contact area between the spiral point drilling tool and the rock wall is large, the damage effect on the rock wall is large, complex micro cracks are easily formed near the grooving, and the large interference is realized on the expansion direction of later-stage hydraulic fracturing cracks; when the cutter cuts a rock wall, sparks are easy to generate, when the motor works, high temperature is easy to generate, the device is not provided with a corresponding water cooling system, explosive gases such as underground gas and the like are easy to ignite, and potential safety hazards exist; in addition, multiple actions such as stretching, shrinking and translation of the connecting rod are controlled by the driving device through gear transmission, a transmission system and a circuit system are complex, the operation flow is complex, conditions such as rock hardness of the inner wall of a drill hole are complex and changeable, and real-time artificial effective control over the feed speed is difficult to perform.
Disclosure of Invention
In order to solve the problems, the invention provides a longitudinal joint cutting device for a deep hole, which solves the problem of longitudinal joint cutting at the position of a hard top plate in the deep part of a hydraulic fracturing drill hole. In addition, the invention also provides a longitudinal slitting method for the deep part of the hole.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first technical scheme, a drilling deep longitudinal joint-cutting device which is characterized in that: the joint cutting device comprises a hollow drill rod, a joint cutting device drill bit and an operation assembly, wherein the joint cutting device drill bit is arranged at the head end of the hollow drill rod, the operation assembly is arranged at the tail section of the hollow drill rod, and the operation assembly is used for controlling the hollow drill rod to move so as to control the feeding position and angle of the joint cutting device drill bit; the joint cutting device drill bit comprises a power supply device, a small explosion-proof motor arranged in the drill bit, a motor transmission gear, a transmission gear set, a diamond saw blade and mounting clamping plates, wherein the transmission gear set comprises a primary transmission shaft, a secondary transmission shaft, a primary bevel gear, a primary cylindrical gear and a secondary cylindrical gear; the device comprises a primary transmission shaft, a secondary transmission shaft, a primary cylindrical gear, a secondary cylindrical gear, a power supply device, a mounting clamp plate, a diamond saw blade, a motor transmission gear and a diamond saw blade, wherein the primary cylindrical gear is arranged on the primary transmission shaft, the primary cylindrical gear and the diamond saw blade are arranged on the secondary transmission shaft, the primary cylindrical gear and the secondary cylindrical gear are meshed with each other, the small-sized explosion-proof motor arranged in a drill bit is arranged inside the head section of a hollow drill rod, the power supply device of the small-sized explosion-proof motor is electrically connected with the small-sized explosion-proof motor arranged in the drill bit so as to supply power to the small-sized explosion-proof motor arranged in the drill bit, the mounting clamp plate is arranged at the end face of the head of the hollow drill rod; the tail part of the hollow drill rod is also provided with an operation assembly for controlling the hollow drill rod.
In the first technical scheme, preferably, the tail part of the hollow drill rod is provided with a high-pressure water pump and a high-pressure water injection pipeline, the water outlet end of the high-pressure water pump is in sealing connection with the tail part of the hollow drill rod through the high-pressure water injection pipeline, the high-pressure water pump is used for supplying water to the inner cavity of the hollow drill rod, the head end of the hollow drill rod is provided with a lancing device drill bit jet nozzle, the lancing device drill bit jet nozzle is communicated with the inner cavity of the hollow drill rod, and water flow in the hollow drill rod can be ejected out through the lancing device drill bit jet nozzle so as to cool the water of the lancing device drill bit and flush rock cutting in.
In the first technical solution, preferably, the operating assembly includes a hydraulically controlled tilt chassis and two sets of drill rod holders, wherein the two sets of drill rod holders are both mounted on the hydraulically controlled tilt chassis, and the two sets of drill rod holders are clasped to the tail section of the hollow drill rod;
the drilling rod holder includes the rotatory fixed pin of holder outer sleeve, holder inner skleeve, holder outer skleeve roller bearing, inner skleeve and the radial push rod of holder inner skleeve, and wherein holder outer skleeve and holder inner skleeve suit, holder outer skleeve roller bearing set up between holder inner skleeve and holder outer skleeve, make holder inner skleeve and holder outer skleeve axial displacement relatively, the outside at hollow drilling rod is arranged in to the radial push rod middle part suit of holder inner skleeve, and the holder outer skleeve is arranged in to the handle of holder inner skleeve radial push rod outside, the rotatory fixed pin detachable cartridge of inner skleeve makes both location on holder outer skleeve and holder inner skleeve, set up.
In the first technical scheme, preferably, the lithium battery with the built-in small-sized explosion-proof motor for the drill bit is provided with a switch of the built-in small-sized explosion-proof motor for the drill bit, the switch of the built-in small-sized explosion-proof motor for the drill bit is positioned at the tail part of the drill bit of the joint cutting device and faces the inner cavity of the hollow drill rod, and after water is injected into the inner cavity of the hollow drill rod and exceeds a threshold value, the built-in small-sized explosion-proof.
In the first technical solution, preferably, the tail of the hollow drill rod is provided with an external power supply box, the external power supply box is electrically connected with the small explosion-proof motor built in the drill bit through a motor cable, the front section of the motor cable is located inside the drill bit of the joint cutting device, and the main body of the motor cable is arranged outside the hollow drill rod.
In the first aspect, preferably, the diamond saw blade is a non-circular saw blade.
In a second aspect, a deep-drilled longitudinal slitting method using the deep-drilled longitudinal slitting device of the first aspect, comprises the steps of,
step one, before deep longitudinal joint cutting operation, a drilling system forms a long drill hole with a preset size on a coal seam top plate, two drill rod holders are used for holding a joint cutting device drill bit through a hollow drill rod, wherein the pushing direction of an inner sleeve radial push rod of each holder is radially consistent with that of a diamond saw blade, the inclination chassis is controlled by adjusting hydraulic pressure to realize drill hole centering, a first inner sleeve rotating fixing pin and a second inner sleeve rotating fixing pin of a drill rod holder are removed, the inner sleeve radial push rod of the inner sleeve of each holder, the inner sleeve and the diamond saw blade are rotated to the pre-cutting groove direction, the inner sleeve rotating fixing pins are inserted to fix the inner sleeves, a plurality of hollow drill rods are used, the joint cutting device drill bit is pushed to the position of a hard top plate with a preset joint cutting through the opening and closing of a first drill rod holder and the opening and, the consistent direction of the diamond saw blade and the radial push rod of the inner sleeve of the clamp is realized;
secondly, the diamond saw blade rotates at a high speed, a high-pressure water pump is used for injecting high-pressure water to a joint cutting device drill bit through a high-pressure water injection pipeline and a hollow drill rod, a built-in small explosion-proof motor switch of the drill bit retracts axially under the action of the high-pressure water, then a built-in small explosion-proof motor switch of the drill bit is connected, a built-in small explosion-proof motor of the drill bit, a lithium battery of the built-in small explosion-proof motor of the drill bit and an internal circuit formed by serially connecting the built-in small explosion-proof motor switch of the drill bit are connected, the built-in small explosion-proof motor of the drill bit starts to work to drive a transmission gear of a motor to rotate transversely, the transmission gear of the motor drives the diamond saw blade fixed in the middle of a, carrying out water cooling on the drill bit of the whole joint cutting device, and flushing out rock debris in the joint cutting process;
and step three, the diamond saw blade is subjected to radial feeding and longitudinal joint cutting, after the diamond saw blade fixed in the middle of the secondary transmission shaft and the gear rotates, the radial small-amplitude controllable radial movement of the whole hollow drill rod and the joint cutting device drill bit is controlled by operating an inner sleeve radial push rod of a first drill rod holder and a second drill rod holder to complete the preset radial feeding action of the diamond saw blade, the drill rod is loosened by the first drill rod holder in a small amplitude, the drill rod is clamped by the second drill rod holder and slowly and controllably moves along the axial direction of a slide way on the upper portion of the hydraulically-controlled tilt chassis to complete the whole small-amplitude controllable longitudinal movement of the hollow drill rod and the joint.
Step four, the diamond saw blade retreats and symmetrically cuts the slot longitudinally, after the slot is cut on one side, the hollow drill rod and the drill bit of the slot cutting device are controlled to move slowly in a small amplitude along the opposite direction of the radial direction of the feed by operating the first drill rod holder and the second drill rod holder, the retracting action of the drill bit of the slot cutting device to the position before the feed is realized by operating the first drill rod holder and the second drill rod holder, and the feeding and longitudinal slot cutting work of the diamond saw blade on the symmetrical side is finished according to the step three;
and step five, stopping water injection, withdrawing the drill rod drill bit of the joint cutting device by operating the first drill rod holder and the second drill rod holder, sealing the hole of the joint cutting position by using a packer, and injecting high-pressure water into the hole sealing position by using a high-pressure large-flow pump through a high-pressure resistant pipeline to complete the longitudinal hydraulic fracture of the joint cutting.
In a third aspect, a deep-drilled longitudinal slitting method using the deep-drilled longitudinal slitting device of the first aspect, comprises the steps of,
step one, before deep longitudinal joint cutting operation, a drilling system forms a long drill hole with a preset size on a coal seam top plate, a first drill rod holder and a second drill rod holder are used for holding a joint cutting device drill bit through a single section of drill rod, wherein the pushing direction of a radial push rod of an inner sleeve of the holder is radially consistent with that of a diamond saw blade, a tilting chassis is controlled by adjusting hydraulic pressure to realize drilling centering, a rotary fixing pin of the inner sleeve of the first drill rod holder and the second drill rod holder is removed, the radial push rod of the inner sleeve of the holder, the inner sleeve of the holder and the diamond saw blade are rotated to the pre-cutting groove direction, the rotary fixing pin of the inner sleeve is inserted to fix the inner sleeve, a plurality of hollow drill rods are used, the joint cutting device drill bit is pushed to the position of a hard top plate, the direction of the diamond saw blade and the direction of the radial push rod of the inner sleeve of the clamp are consistent all the time by aligning the mark lines on the drill rod;
secondly, the diamond saw blade rotates at a high speed, the external power box controls the work of a small explosion-proof motor arranged in the drill bit through an external cable of the motor, a waterproof joint and an internal cable of the motor to drive a transmission gear of the motor to transversely rotate, the transmission gear of the motor drives the diamond saw blade fixed in the middle of a transmission shaft to longitudinally rotate through a transmission gear group, and meanwhile, a high-pressure water pump is started to inject high-pressure water to the drill bit of the joint cutting device through a high-pressure water injection rubber pipe and a hollow drill rod, and the high-pressure water is sprayed out from a jet nozzle of the drill bit of the joint cutting device through a jet pipeline of the drill bit of the joint cutting device, so;
and step three, the diamond saw blade is subjected to radial feeding and longitudinal joint cutting, after the diamond saw blade fixed in the middle of the secondary transmission shaft and the gear rotates, the radial small-amplitude controllable radial movement of the whole hollow drill rod and the joint cutting device drill bit is controlled by operating an inner sleeve radial push rod of a first drill rod holder and a second drill rod holder to complete the preset radial feeding action of the diamond saw blade, the drill rod is loosened by the first drill rod holder in a small amplitude, the drill rod is clamped by the second drill rod holder and slowly and controllably moves along the axial direction of a slide way on the upper portion of the hydraulically-controlled tilt chassis to complete the whole small-amplitude controllable longitudinal movement of the hollow drill rod and the joint.
Step four, the diamond saw blade retreats and symmetrically cuts the slot longitudinally, after the slot is cut on one side, the hollow drill rod and the drill bit of the slot cutting device are controlled to move slowly in a small amplitude along the radial direction opposite to the feed direction by operating the first drill rod holder and the second drill rod holder, the diamond saw blade retreating action is completed, the drill bit of the slot cutting device is retreated to the position where the drill bit is located before the feed by operating the first drill rod holder and the second drill rod holder, and the diamond saw blade feed and longitudinal slot cutting work on the symmetrical side is completed according to the step three;
and step five, closing the external power supply box, withdrawing the drill rod drill bit of the joint cutting device by operating the first drill rod holder and the second drill rod holder, sealing the hole of the joint cutting position by using a packer, and injecting high-pressure water into the hole sealing position by using a high-pressure large-flow pump through a high-pressure resistant pipeline to complete the longitudinal hydraulic fracture of the joint cutting.
The beneficial effects of the invention are as follows:
compared with the prior art, the drilling machine has the advantages that on the basis of drilling and pore-forming of the traditional drilling machine, the front-end electric rotating machine is used, the diamond saw blade is driven to longitudinally rotate through the two groups of simple transmission systems, actions such as feeding of the diamond saw blade are completed through the four-way movable base, small-size drilling and deep remote cutting are realized, the transmission is simple, the operation is convenient, the control is easy, and the like, the deep remote longitudinal joint cutting of the drilling is realized, the joint cutting operation flow is simplified, the labor intensity of workers is reduced, the mechanical loss of a drilling tool is reduced, and the joint cutting success rate is improved; the method is beneficial to improving the treatment level of the mine roof and ensuring the safe and efficient production of the coal mine.
Drawings
FIG. 1 is a schematic view of the internal structure of the deep drilling longitudinal lancing device of the present invention.
FIG. 2 is a schematic view of the external structure of the deep-hole longitudinal slitting device.
Fig. 3 is a schematic view of the whole structure of the drilling deep longitudinal slitting device.
FIG. 4 is a schematic view of the internal structure of the holder in the deep-hole longitudinal slitting device according to the present invention.
FIG. 5 is a schematic view of the internal structure of a deep-bored longitudinal slit apparatus according to another embodiment of the present invention.
FIG. 6 is a schematic external view of a deep borehole longitudinal slitting apparatus according to another embodiment of the invention.
Fig. 7 is a schematic view of the overall structure of a deep-drilled longitudinal slitting device according to another embodiment of the invention.
FIG. 8 is a schematic view of the transmission gear of the motor and the diamond saw blade in the deep longitudinal slitting device for drilling holes.
The reference numerals include:
1-a high-pressure water pump, 2-a high-pressure water injection pipeline, 3-a bit built-in small explosion-proof motor switch, 4-a bit built-in small explosion-proof motor lithium battery, 5-a bit built-in small explosion-proof motor, 6-a motor transmission gear, 7-a first-stage gear assembly, 8-a second-stage gear assembly, 9-a diamond saw blade, 10-a lancing device bit, 11-a hollow drill rod, 12-a lancing device bit jet pipeline, 13-a lancing device bit jet nozzle, 14-a first drill rod holder, 15-a second drill rod holder, 16-a holder inner sleeve radial push rod, 17-a hydraulic control tilt-up chassis, 18-a high-pressure water injection pipeline, 19-a high-pressure water pump, 21-a holder outer sleeve, 22, 23-clamp outer sleeve roller, 24-inner sleeve rotation fixing pin, 30-drill hole, 31-external power box, 32-motor external cable, 33-waterproof joint and 34-motor internal cable.
The gear comprises an a-first-stage bevel gear, a b-first-stage transmission shaft, a c-first-stage cylindrical gear, a d-second-stage cylindrical gear and an e-second-stage transmission shaft.
Detailed Description
In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present teachings.
Example 1
As shown in fig. 1-4, a deep drilling longitudinal joint cutting device comprises a hollow drill rod 11, a joint cutting device drill bit 10 and an operating assembly, wherein the joint cutting device drill bit 10 is installed at the head end of the hollow drill rod 11, the operating assembly is installed at the tail section of the hollow drill rod 11, and the operating assembly is used for controlling the hollow drill rod 11 to move so as to control the feeding position and angle of the joint cutting device drill bit 10; the cutting and sewing device drill bit 10 comprises a drill bit built-in small-sized explosion-proof motor lithium battery 4, a drill bit built-in small-sized explosion-proof motor 5, a motor transmission gear 6, a primary gear assembly 7, a secondary gear assembly 8, a diamond saw blade 9 and an installation clamping plate, wherein the drill bit built-in small-sized explosion-proof motor lithium battery 4 and the drill bit built-in small-sized explosion-proof motor 5 are both arranged inside the head section of the hollow drill rod 11, the drill bit built-in small-sized explosion-proof motor lithium battery 4 and the drill bit built-in small-sized explosion-proof motor 5 are electrically connected to supply power to the drill bit built-in small-sized explosion-proof motor 5, the motor transmission gear 6 is connected on the installation shaft of the drill bit built-in small-sized explosion-proof, and the primary gear assembly 7 and the motor transmission gear 6 are meshed with each other, so that the motor can drive the diamond saw blade 9 to rotate through the motor transmission gear 6, the primary gear assembly 7 and the secondary gear assembly 8, the diamond saw blade 9 is installed in the installation clamping plate, the clamping plate is installed on part of the outer edge of the diamond saw blade 9 in a protruding mode, the diameter of the diamond saw blade 9 is larger than that of the hollow drill rod 11, and the tail portion of the hollow drill rod is further provided with an operation assembly for controlling the hollow drill.
Wherein, the afterbody of hollow drill pipe 11 has high pressure water pump 1 and high-pressure water injection pipeline 2, wherein the play water end of high pressure water pump 1 passes through high-pressure water injection pipeline 2 and 11 end connection of hollow drill pipe, high pressure water pump 1 is used for supplying water to the inside cavity of hollow drill pipe 11, the head end of hollow drill pipe 11 has joint-cutting device drill bit jet nozzle 13, this joint-cutting device drill bit jet nozzle 13 and the inside cavity of hollow drill pipe 11 intercommunication, the inside rivers accessible joint-cutting device drill bit jet nozzle 13 of hollow drill pipe 11 jets out to carry out water cooling to joint-cutting device drill bit 10, and wash out the rock cutting at the joint-cutting in-process.
The operation assembly comprises a hydraulic control tilting chassis 17 and two groups of drill rod holders, wherein the two groups of drill rod holders are both arranged on the hydraulic control tilting chassis 17, and the two groups of drill rod holders are held at the tail section of the hollow drill rod 11; the drill rod holder comprises a holder outer sleeve 21, a holder inner sleeve 22, a holder outer sleeve roller 23, an inner sleeve rotation fixing pin 24 and a holder inner sleeve 22 radial push rod 16, the clamp holder outer sleeve 21 and the clamp holder inner sleeve 22 are sleeved, the clamp holder outer sleeve roller 23 is arranged between the clamp holder inner sleeve 22 and the clamp holder outer sleeve 21, the clamp holder inner sleeve 22 and the clamp holder outer sleeve 21 can move axially relative to each other, the middle of a radial push rod 16 of the clamp holder inner sleeve 22 is sleeved on the outer side of the hollow drill rod 11, a handle of the radial push rod 16 of the clamp holder inner sleeve 22 is arranged outside the clamp holder outer sleeve 21, an inner sleeve rotating fixing pin 24 is detachably inserted on the clamp holder outer sleeve 21 and the clamp holder inner sleeve 22 and enables the clamp holder outer sleeve 21 and the clamp holder inner sleeve 22 to be positioned, a slideway is arranged on the.
The lithium battery 4 with the built-in small-sized explosion-proof motor for the drill bit is provided with a switch 3 with the built-in small-sized explosion-proof motor for the drill bit, the switch 3 with the built-in small-sized explosion-proof motor for the drill bit is positioned at the tail of a drill bit 10 of the joint cutting device and faces towards the inner cavity of the hollow drill rod 11, and after water is injected into the inner cavity of the hollow drill rod 11 and exceeds a threshold value, the switch 5 with the built-.
Specifically, the output end of a high-pressure water pump 1 is connected with a hollow drill rod 11 through a high-pressure water injection pipeline 2; the input end of a small explosion-proof motor 5 arranged in the drill bit is connected with a lithium battery 4 of the small explosion-proof motor arranged in the drill bit and a switch 3 of the small explosion-proof motor arranged in the drill bit in series through an internal circuit, the output end of the small explosion-proof motor is connected with a primary gear assembly 7 through a motor transmission gear 6, the primary gear assembly 7 is connected with a secondary gear assembly 8, and a diamond saw blade 9 is fixed in the middle of the secondary gear assembly; the slitting device drill bit 10 is connected with a hollow drill rod 11, a first drill rod holder 14 is fixed at the front end of a hydraulic control tilting chassis 17, and a second drill rod holder 15 is located on the hydraulic control tilting chassis 17 and can move axially along a slide way on the upper portion of the hydraulic control tilting chassis 17.
The diamond saw blade 9 is a non-circular saw blade such as a triangular, oval, etc. After the diamond saw blade 9 is pushed into the drill hole 30, the small explosion-proof motor 5 arranged in the drill bit rotates to drive the diamond saw blade 9 to cut.
A method for drilling deep longitudinal slitting uses the drilling deep longitudinal slitting device, which comprises the following steps,
step one, before deep longitudinal slitting operation, a drilling system forms a long drill hole 30 with a preset size on a coal seam roof, two drill rod holders I14 are used for holding a slitting device drill bit 10 through a single section of drill rod, wherein the pushing direction of a radial push rod 16 of an inner sleeve 22 of the holder can be radially consistent with that of a diamond saw blade 9, a base plate 17 is controlled to be tilted upwards through adjusting hydraulic pressure to realize drilling centering, the inner sleeve rotating fixing pin 24 of the first drill rod holder 14 and the second drill rod holder 15 is removed, the radial push rod 16 of the inner sleeve 22 of the holder together with a built-in sleeve of the holder and the diamond saw blade 9 are rotated to the pre-grooving direction, the inner sleeve rotating fixing pin 24 is inserted to fix the inner sleeve, the slitting device drill bit 10 is pushed to the position of a preset slitting hard roof through opening and closing of the first drill rod holder 14 and opening and closing, in the process of connecting a plurality of drill rods, the diamond saw blade 9 and the inner sleeve 22 of the clamp are always consistent in the direction of the radial push rod 16 through alignment of the mark lines on the drill rods;
secondly, the diamond saw blade 9 rotates at a high speed, a high-pressure water pump 1 is used for injecting high-pressure water into a joint cutting device drill bit 10 through a high-pressure water injection pipeline 2 and a hollow drill rod 11, a built-in small-sized explosion-proof motor switch 3 of the drill bit retracts axially under the action of the high-pressure water, and then the built-in small-sized explosion-proof motor 5 of the drill bit, a built-in small-sized explosion-proof motor lithium battery 4 of the drill bit and the built-in small-sized explosion-proof motor switch 3 of the drill bit are connected in series to form an internal circuit, the built-in small-sized explosion-proof motor 5 of the drill bit starts to work to drive a motor transmission gear 6 to rotate transversely, a primary transmission shaft meshed with the motor transmission gear 6 and a primary gear assembly 7 are driven, meanwhile, the high-pressure water pump 1 is started to inject high-pressure water into the joint cutting device drill bit 10 through the high-pressure water injection pipeline 2 and the hollow drill rod 11, the high-pressure water is sprayed out of the joint cutting device drill bit jet flow nozzle 12 through the joint cutting device drill bit jet flow pipeline 12, the whole joint cutting device drill bit 10 is cooled by water while longitudinal rotation is achieved, and rock debris is flushed out in the joint cutting process;
and step three, after the diamond saw blade 9 fixed in the middle of the secondary gear assembly 8 rotates, the diamond saw blade 9 controls the hollow drill rod 11 and the joint-cutting device drill bit 10 to move in a controllable radial direction with small amplitude in the whole radial direction by operating the inner sleeve 22 and the radial push rod 16 of the first drill rod holder 14 and the second drill rod holder 15 to complete the preset radial feeding action of the diamond saw blade 9, the drill rod is loosened in a small amplitude by the first drill rod holder 14, the drill rod holder 15 clamps the drill rod and moves slowly and controllably along the axial direction of the slide way on the hydraulic control tilt-up chassis 17 to complete the controllable longitudinal movement of the hollow drill rod 11 and the joint-cutting device drill bit 10 in the whole small amplitude, and longitudinal joint.
Fourthly, the diamond saw blade 9 retreats and symmetrically cuts the slot longitudinally, after one side is cut, the hollow drill rod 11 and the whole cutting device drill bit 10 are controlled to move slowly in a small amplitude along the radial opposite direction of the feed by operating the first drill rod holder 14 and the second drill rod holder 15, the diamond saw blade 9 retreating action is completed, the cutting device drill bit 10 is operated to retreat to the position before the feed by operating the first drill rod holder 14 and the second drill rod holder 15, and the feed and longitudinal cutting work of the diamond saw blade 9 on the symmetrical side is completed according to the third step;
and step five, stopping water injection, withdrawing the drill rod drill bit 10 of the joint cutting device by operating the first drill rod holder 14 and the second drill rod holder 15, sealing the hole of the joint cutting position by using a packer, and injecting high-pressure water into the hole sealing position by using a high-pressure large-flow pump through a high-pressure resistant pipeline to complete the longitudinal hydraulic fracture of the joint cutting.
As shown in fig. 8, specifically, the motor transmission gear 6 is a power output end, the primary transmission shaft b and the secondary transmission shaft e are both arranged between the two mounting splints, the motor transmission gear 6 is a bevel gear, the primary bevel gear a is mounted on the primary transmission shaft b, and the motor transmission gear 6 and the primary bevel gear a are meshed with each other; one-level cylindrical gear c is installed on one-level transmission shaft b, and second grade cylindrical gear d and diamond saw blade 9 all install on second grade transmission shaft e simultaneously, and one-level cylindrical gear c and second grade cylindrical gear d intermeshing.
Therefore, the motor transmission gear 6 can drive the primary bevel gear a to rotate, and further drive the primary transmission shaft b and the primary cylindrical gear c to rotate; the first-stage cylindrical gear c drives the second-stage cylindrical gear d to rotate, and further drives the diamond saw blade 9 to rotate.
Example 2
The deep-hole longitudinal slitting device in this embodiment is similar to that in embodiment 1, except that the small explosion-proof motor 5 with a built-in drill is supplied with power through a cable, that is, the small explosion-proof motor 5 is supplied with power externally, and the lithium battery 4 with a built-in drill in embodiment 1 is eliminated.
Specifically, as shown in fig. 5-7, in this embodiment, the hollow drill rod 11 has an external power supply box 31 at the tail, the external power supply box 31 is electrically connected to the small explosion-proof motor 5 built in the drill bit through a motor cable, the front section of the motor cable is located inside the drill bit of the joint cutting device, and the cable body is located outside the hollow drill rod 11.
A method for drilling deep longitudinal slitting, which uses the drilling deep longitudinal slitting device in the embodiment, comprises the following steps,
step one, before deep longitudinal slitting operation, a drilling system forms a long drill hole 30 with a preset size on a coal seam roof, a slitting device drill bit 10 is clamped by a drill rod clamp I14 and a drill rod clamp II 15 through a single section of drill rod, wherein the pushing direction of a clamp inner sleeve 22 radial push rod 16 can be radially consistent with that of a diamond saw blade 9, the boring centering is realized by adjusting a hydraulic control tilting chassis 17, an inner sleeve rotating fixing pin 24 of the drill rod clamp I14 and the drill rod clamp II 15 is removed, the clamp inner sleeve 22 radial push rod 16, a clamp built-in sleeve and the diamond saw blade 9 are rotated to the pre-grooving direction, the inner sleeve is fixed by inserting the inner sleeve rotating fixing pin 24, the inner sleeve is fixed by utilizing a plurality of hollow drill rods 11, and the slitting device drill bit 10 is pushed to the position of a preset slitting hard roof through the opening and closing of the drill rod clamp I14, in the process of connecting a plurality of drill rods, the diamond saw blade 9 and the inner sleeve 22 of the clamp are always consistent in the direction of the radial push rod 16 through alignment of the mark lines on the drill rods;
secondly, the diamond saw blade 9 rotates at a high speed, the external power supply box 31 controls the work of a small-sized explosion-proof motor 5 arranged in the drill bit through an external cable 32 of the motor, a waterproof joint 33 and an internal cable 34 of the motor to drive a transmission gear 6 of the motor to transversely rotate, a primary gear assembly 7 meshed with the transmission gear 6 of the motor through a bevel gear is driven to longitudinally rotate, a secondary gear assembly 8 meshed with the primary gear assembly 7 through a gear is further driven to longitudinally rotate, the diamond saw blade 9 fixed in the middle of the secondary gear assembly 8 is finally driven to longitudinally rotate, meanwhile, a high-pressure water pump 19 is started to inject high-pressure water to the drill bit 10 of the joint cutting device through a high-pressure water injection pipeline 18 and a hollow drill rod 11, the high-pressure water passes through a jet pipeline 12 of the drill bit of the joint cutting, And punching out rock cuttings in the joint cutting process;
and step three, after the diamond saw blade 9 fixed in the middle of the secondary gear assembly 8 rotates, the diamond saw blade 9 controls the hollow drill rod 11 and the joint-cutting device drill bit 10 to move in a controllable radial direction with small amplitude in the whole radial direction by operating the inner sleeve 22 and the radial push rod 16 of the first drill rod holder 14 and the second drill rod holder 15 to complete the preset radial feeding action of the diamond saw blade 9, the drill rod is loosened in a small amplitude by the first drill rod holder 14, the drill rod holder 15 clamps the drill rod and moves slowly and controllably along the axial direction of the slide way on the hydraulic control tilt-up chassis 17 to complete the controllable longitudinal movement of the hollow drill rod 11 and the joint-cutting device drill bit 10 in the whole small amplitude, and longitudinal joint.
And step four, retracting and symmetrically longitudinally slitting the diamond saw blade 9, controlling the hollow drill rod 11 and the whole cutting device drill bit 10 to slowly move in a small amplitude along the radial direction opposite to the feeding direction by operating the first drill rod holder 14 and the second drill rod holder 15 after one side is slit, completing retracting action of the diamond saw blade 9, realizing that the cutting device drill bit 10 retracts to the position before feeding by operating the first drill rod holder 14 and the second drill rod holder 15, and completing feeding and longitudinally slitting work of the diamond saw blade 9 on the symmetrical side by referring to the step three.
And step five, closing the external power supply box 31, stopping water injection, withdrawing the drill rod drill bit 10 of the joint cutting device by operating the first drill rod holder 14 and the second drill rod holder 15, sealing the joint cutting position by using a packer, and injecting high-pressure water into the hole sealing position by using a high-pressure large-flow pump through a high-pressure resistant pipeline to complete the longitudinal hydraulic fracture of the joint cutting.
The foregoing is only a preferred embodiment of the present invention, and many variations in the specific embodiments and applications of the invention may be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the claims of this patent.
Claims (8)
1. The utility model provides a drilling deep vertical joint-cutting device which characterized in that: the joint cutting device comprises a hollow drill rod, a joint cutting device drill bit and an operation assembly, wherein the joint cutting device drill bit is arranged at the head end of the hollow drill rod, the operation assembly is arranged at the tail section of the hollow drill rod, and the operation assembly is used for controlling the hollow drill rod to move so as to control the feeding position and angle of the joint cutting device drill bit; the joint cutting device drill bit comprises a power supply device, a small explosion-proof motor arranged in the drill bit, a motor transmission gear, a transmission gear set, a diamond saw blade and mounting clamping plates, wherein the transmission gear set comprises a primary transmission shaft, a secondary transmission shaft, a primary bevel gear, a primary cylindrical gear and a secondary cylindrical gear; the device comprises a primary transmission shaft, a secondary transmission shaft, a primary cylindrical gear, a secondary cylindrical gear, a power supply device, a mounting clamp plate, a diamond saw blade, a motor transmission gear and a diamond saw blade, wherein the primary cylindrical gear is arranged on the primary transmission shaft, the primary cylindrical gear and the diamond saw blade are arranged on the secondary transmission shaft, the primary cylindrical gear and the secondary cylindrical gear are meshed with each other, the small-sized explosion-proof motor arranged in a drill bit is arranged inside the head section of a hollow drill rod, the power supply device of the small-sized explosion-proof motor is electrically connected with the small-sized explosion-proof motor arranged in the drill bit so as to supply power to the small-sized explosion-proof motor arranged in the drill bit, the mounting clamp plate is arranged at the end face of the head of the hollow drill rod; the tail part of the hollow drill rod is also provided with an operation assembly for controlling the hollow drill rod.
2. The borehole deep longitudinal slitting device according to claim 1, wherein: the tail of the hollow drill rod is provided with a high-pressure water pump and a high-pressure water injection pipeline, the water outlet end of the high-pressure water pump is connected with the tail of the hollow drill rod in a sealing mode through the high-pressure water injection pipeline, the high-pressure water pump is used for supplying water to the inner cavity of the hollow drill rod, the head end of the hollow drill rod is provided with a cutting and cutting device drill bit jet nozzle, the cutting and cutting device drill bit jet nozzle is communicated with the inner cavity of the hollow drill rod, and water flow inside the hollow drill rod can be ejected out through the cutting and cutting device drill bit jet nozzle so as to cool the cutting and flush rock.
3. The borehole deep longitudinal slitting device according to claim 2, wherein: the operation assembly comprises a hydraulic control tilting chassis and two groups of drill rod holders, wherein the two groups of drill rod holders are both arranged on the hydraulic control tilting chassis, and the two groups of drill rod holders are held at the tail section of the hollow drill rod;
the drilling rod holder includes the radial push rod of holder outer sleeve, holder inner skleeve, the rotatory fixed pin of holder outer skleeve roller bearing, inner skleeve and holder inner skleeve, and wherein holder outer skleeve and holder inner skleeve suit, holder outer skleeve roller bearing set up between holder inner skleeve and holder outer skleeve, make holder inner skleeve and holder outer skleeve relatively rotatable, the outside at hollow drilling rod is arranged in to the radial push rod middle part suit of holder inner skleeve, and the holder outer skleeve is arranged in to the handle of the radial push rod of holder inner skleeve outside, the rotatory fixed pin detachable cartridge of inner skleeve makes both location on holder outer skleeve and holder inner skleeve.
4. The borehole deep longitudinal slitting device according to claim 3, wherein: the built-in small-size explosion-proof motor lithium cell of drill bit is set up to head built-in small-size explosion-proof motor afterbody, the built-in small-size explosion-proof motor lithium cell of drill bit has the built-in small-size explosion-proof motor switch of drill bit, and this built-in small-size explosion-proof motor switch of drill bit is located joint-cutting device drill bit afterbody and towards hollow drill rod inside cavity, and behind the water injection exceeded the threshold value in hollow drill rod inside cavity, the built-in small-size explosion-proof motor.
5. The borehole deep longitudinal slitting device according to claim 3, wherein: the tail part of the hollow drill rod is provided with an external power supply box which is electrically connected with a small explosion-proof motor arranged in the drill bit through a motor cable; the front section of the motor cable is positioned inside the cutting and sewing device drill bit, and the motor cable main body is arranged outside the hollow drill rod.
6. The borehole deep longitudinal slitting device according to claim 1, wherein: the diamond saw blade is a non-circular saw blade.
7. A method of deep-drilled longitudinal slitting using the deep-drilled longitudinal slitting device of claim 4, characterized in that: comprises the following steps of (a) carrying out,
step one, before deep longitudinal lancing operation, a drilling system forms a long drill hole with a preset size on a coal seam roof, two drill rod holders are used for holding a lancing device drill bit through a single section of drill rod, wherein the pushing direction of a radial push rod of an inner sleeve of the holder is radially consistent with that of a diamond saw blade, the drilling centering is realized by adjusting a hydraulic control tilting chassis, a rotary fixing pin of the inner sleeve of the drill rod holder I and the inner sleeve of the drill rod holder II is removed, the radial push rod of the inner sleeve of the holder, the inner sleeve of the holder and the diamond saw blade are rotated to the pre-grooving direction, the rotary fixing pin of the inner sleeve is inserted to fix the inner sleeve, a plurality of hollow drill rods are used, the lancing device drill bit is pushed to the position of a hard roof with a preset lancing through the opening and closing of the drill rod holder I and the opening and, the consistent direction of the diamond saw blade and the radial push rod of the inner sleeve of the clamp is realized;
secondly, the diamond saw blade rotates at a high speed, a high-pressure water pump is used for injecting high-pressure water to a joint cutting device drill bit through a high-pressure water injection pipeline and a hollow drill rod, a built-in small explosion-proof motor switch of the drill bit retracts axially under the action of the high-pressure water, then a built-in small explosion-proof motor switch of the drill bit is connected, a built-in small explosion-proof motor of the drill bit, a lithium battery of the built-in small explosion-proof motor of the drill bit and an internal circuit formed by serially connecting the built-in small explosion-proof motor switch of the drill bit are connected, the built-in small explosion-proof motor of the drill bit starts to work to drive a transmission gear of a motor to rotate transversely, the transmission gear of the motor drives the diamond saw blade fixed in the middle of a, carrying out water cooling on the drill bit of the whole joint cutting device, and flushing out rock debris in the joint cutting process;
step three, the diamond saw blade is subjected to radial feeding and longitudinal joint cutting, after the diamond saw blade fixed in the middle of the secondary transmission shaft and the gear rotates, the hollow drill rod and the joint cutting device drill bit are controlled to move in a controllable radial direction in a small radial range through operating an inner sleeve radial push rod of a first drill rod holder and a second drill rod holder, the diamond saw blade is subjected to preset radial feeding action, the drill rod is loosened in a small range by the first drill rod holder, the drill rod holder is clamped by the second drill rod holder and slowly and controllably moves along the axial direction of a slide way on the upper portion of the hydraulic control tilt-up chassis, the hollow drill rod and the whole drill bit of the joint cutting device;
step four, the diamond saw blade retreats and symmetrically cuts the slot longitudinally, after the slot is cut on one side, the hollow drill rod and the drill bit of the slot cutting device are controlled to move slowly in a small amplitude along the opposite direction of the radial direction of the feed by operating the first drill rod holder and the second drill rod holder, the retracting action of the drill bit of the slot cutting device to the position before the feed is realized by operating the first drill rod holder and the second drill rod holder, and the feeding and longitudinal slot cutting work of the diamond saw blade on the symmetrical side is finished according to the step three;
and step five, stopping water injection, withdrawing the drill rod drill bit of the joint cutting device by operating the first drill rod holder and the second drill rod holder, sealing the hole of the joint cutting position by using a packer, and injecting high-pressure water into the hole sealing position by using a high-pressure large-flow pump through a high-pressure resistant pipeline to complete the longitudinal hydraulic fracture of the joint cutting.
8. A method of deep-drilled longitudinal slitting using the deep-drilled longitudinal slitting device of claim 5, characterized in that: comprises the following steps
Step one, before deep longitudinal joint cutting operation, a drilling system forms a long drill hole with a preset size on a coal seam top plate, a first drill rod holder and a second drill rod holder are used for holding a joint cutting device drill bit through a single section of drill rod, wherein the pushing direction of a radial push rod of an inner sleeve of the holder is radially consistent with that of a diamond saw blade, a tilting chassis is controlled by adjusting hydraulic pressure to realize drilling centering, a rotary fixing pin of the inner sleeve of the first drill rod holder and the second drill rod holder is removed, the radial push rod of the inner sleeve of the holder, the inner sleeve of the holder and the diamond saw blade are rotated to the pre-cutting groove direction, the rotary fixing pin of the inner sleeve is inserted to fix the inner sleeve, a plurality of hollow drill rods are used, the joint cutting device drill bit is pushed to the position of a hard top plate, the direction of the diamond saw blade and the direction of the radial push rod of the inner sleeve of the clamp are consistent all the time by aligning the mark lines on the drill rod;
secondly, the diamond saw blade rotates at a high speed, the external power box controls the work of a small explosion-proof motor arranged in the drill bit through an external cable of the motor, a waterproof joint and an internal cable of the motor to drive a transmission gear of the motor to transversely rotate, the transmission gear of the motor drives the diamond saw blade fixed in the middle of a transmission shaft to longitudinally rotate through a transmission gear group, and meanwhile, a high-pressure water pump is started to inject high-pressure water to the drill bit of the joint cutting device through a high-pressure water injection rubber pipe and a hollow drill rod, and the high-pressure water is sprayed out from a jet nozzle of the drill bit of the joint cutting device through a jet pipeline of the drill bit of the joint cutting device, so;
step three, the diamond saw blade is subjected to radial feeding and longitudinal joint cutting, after the diamond saw blade fixed in the middle of the secondary transmission shaft and the gear rotates, the hollow drill rod and the joint cutting device drill bit are controlled to move in a controllable radial direction in a small radial range through operating an inner sleeve radial push rod of a first drill rod holder and a second drill rod holder, the diamond saw blade is subjected to preset radial feeding action, the drill rod is loosened in a small range by the first drill rod holder, the drill rod holder is clamped by the second drill rod holder and slowly and controllably moves along the axial direction of a slide way on the upper portion of the hydraulic control tilt-up chassis, the hollow drill rod and the whole drill bit of the joint cutting device;
step four, the diamond saw blade retreats and symmetrically cuts the slot longitudinally, after the slot is cut on one side, the hollow drill rod and the drill bit of the slot cutting device are controlled to move slowly in a small amplitude along the radial direction opposite to the feed direction by operating the first drill rod holder and the second drill rod holder, the diamond saw blade retreating action is completed, the drill bit of the slot cutting device is retreated to the position where the drill bit is located before the feed by operating the first drill rod holder and the second drill rod holder, and the diamond saw blade feed and longitudinal slot cutting work on the symmetrical side is completed according to the step three;
and step five, closing the external power supply box, stopping water injection, exiting the drill rod drill bit of the joint cutting device by operating the first drill rod holder and the second drill rod holder, sealing the hole of the joint cutting position by using a packer, and injecting high-pressure water into the hole sealing position by using a high-pressure large-flow pump through a high-pressure resistant pipeline to complete the longitudinal hydraulic fracturing of the joint cutting.
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