CN111140170A - Complete equipment for transverse large-diameter hole forming in coal pillar area of soft coal seam and hole forming process - Google Patents

Complete equipment for transverse large-diameter hole forming in coal pillar area of soft coal seam and hole forming process Download PDF

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Publication number
CN111140170A
CN111140170A CN202010164009.1A CN202010164009A CN111140170A CN 111140170 A CN111140170 A CN 111140170A CN 202010164009 A CN202010164009 A CN 202010164009A CN 111140170 A CN111140170 A CN 111140170A
Authority
CN
China
Prior art keywords
drilling
hole
coal pillar
drill
guide rail
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010164009.1A
Other languages
Chinese (zh)
Inventor
武泽铭
李旭斌
徐云辉
高彬彬
刘亚晓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henan Tiefulai Equipment Manufacturing Co ltd
Original Assignee
Henan Tiefulai Equipment Manufacturing Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henan Tiefulai Equipment Manufacturing Co ltd filed Critical Henan Tiefulai Equipment Manufacturing Co ltd
Priority to CN202010164009.1A priority Critical patent/CN111140170A/en
Publication of CN111140170A publication Critical patent/CN111140170A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/02Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/021With a rotary table, i.e. a fixed rotary drive for a relatively advancing tool
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/042Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/60Drill bits characterised by conduits or nozzles for drilling fluids
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00Supports for the drilling machine, e.g. derricks or masts
    • E21B15/003Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00Supports for the drilling machine, e.g. derricks or masts
    • E21B15/04Supports for the drilling machine, e.g. derricks or masts specially adapted for directional drilling, e.g. slant hole rigs
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/03Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B3/00Rotary drilling
    • E21B3/02Surface drives for rotary drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/02Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/024Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting having means for adapting to inclined terrain; having means for stabilizing the vehicle while drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/28Enlarging drilled holes, e.g. by counterboring
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Abstract

The invention relates to a complete set of equipment for transverse large-diameter hole forming in a coal pillar area of a soft coal seam and a hole forming process. The complete equipment comprises a large-torque drilling machine, a guide hole drilling tool and a hole expanding drilling tool, wherein the large-torque drilling machine comprises a guide rail assembly, a drill stabilizing support assembly and a drilling slewing device; the drill stabilizing support assembly is arranged on a large rotary disc of the large-torque drilling machine and used for providing support for the drilling machine in the drilling process; the drilling slewing device is arranged on the guide rail assembly, and according to the drilling process, the drilling slewing device drives the guide hole drilling tool to rotate so as to realize high-speed drilling or drives the hole expanding drilling tool to rotate so as to realize low-speed high-torque back expansion; the guide rail assembly is arranged on the drill stabilizing support assembly, can realize the adjustment of the drilling position and the drilling direction of the drilling rotary device, and provides required pulling force for the back-expanded drilling hole of the drilling rotary device. The hole forming process comprises a guide hole process and a back expansion process, and can effectively solve the problems of difficult operation, low efficiency, low hole forming rate, high labor intensity and the like when the coal pillar of the soft coal seam is transversely formed with a large diameter.

Description

Complete equipment for transverse large-diameter hole forming in coal pillar area of soft coal seam and hole forming process
Technical Field
The invention belongs to the field of complete equipment in a coal mine, and particularly relates to complete equipment for forming a hole in a large transverse diameter in a coal pillar area of a soft coal seam and a hole forming process.
Background
A goaf can be formed after the coal bed is mined in the coal mine, and gas can flow and gather to the goaf in the coal bed mining process to form upper corner gas. The method aims at the upper corner gas treatment methods, wherein the method with low economic cost and good treatment effect is to construct a large-diameter hole in a coal pillar area and install a gas drainage pipe in the hole to extract the gas in the goaf.
The large-diameter hole expansion in the coal pillar area of the soft coal seam is usually realized by forward drilling of a large-diameter hole, and after the hole drilling is completed, a drilling tool is removed, and then a forward pipe pushing is carried out, so that a gas drainage pipe is pushed into the hole. The construction can be once pore-formed like this, but the efficiency of construction is lower, and owing to adopt the auger stem to creep into during the construction, on-the-spot coal yield is big, and workman's working strength is high, and the pore-forming rate of drilling is low, because the drilling rod overweight leads to the hole deflection more after the pore-forming, the installation protects wall pipe difficult scheduling problem.
Disclosure of Invention
The invention aims to provide complete equipment for transversely forming a large-diameter hole in a soft coal bed coal pillar area and a hole forming process, and aims to solve the problems that the large-diameter hole forming is difficult and the efficiency is low and the like in the soft coal bed coal pillar area in a coal mine.
In order to achieve the purpose, the invention adopts the technical scheme that: a technology for transversely forming large-diameter holes in a coal pillar area of a soft coal seam is characterized by comprising the following steps of: the method comprises a guide hole process and a back expansion process;
(1) in the process of guiding the coal pillar, the drilling machine drills a guide hole drilling tool into the coal pillar in an operation area on one side of the coal pillar and continuously pushes forwards until a guide hole drilling head on the guide hole drilling tool drills through the coal pillar and enters an operation area on the other side of the coal pillar;
(2) in the back expansion process, a guide hole drill bit on a drill rod of the guide hole drilling tool is detached and replaced by a back expansion drill bit, and when the back expansion drill bit is about to enter a coal pillar, a transfer case, a connecting pipe and a gas drainage pipe are sequentially arranged on the back expansion drill bit; then the drill drives the back-expanding drill bit to rotate and retreat, the transfer case drags a connecting pipe connected with the back-expanding drill bit and a gas drainage pipe connected with the connecting pipe to enter a coal pillar, the gas drainage pipe is installed one by one in the process of entering the coal pillar until the whole coal pillar completes the installation of the gas drainage pipe, the back-expanding drill bit exits from drilling at the moment to obtain a large-diameter hole, the reaming drill bit, the transfer case and the connecting pipe are dismantled, the drill is moved to the next hole position, and the guide hole drill bit is installed on the drill rod again to continue construction.
A complete set of equipment for forming a large-diameter hole in a coal pillar region of a soft coal seam in a transverse direction comprises a large-torque drilling machine, a guide hole drilling tool and a hole expanding drilling tool, wherein the large-torque drilling machine comprises a guide rail assembly, a drill stabilizing support assembly and a drilling slewing device; the drill stabilizing support assembly is arranged on a large rotary disc of the large-torque drilling machine and is used for providing front, rear and upper supports for the drilling machine in the drilling process; the drilling slewing device is arranged on the guide rail assembly, and according to the drilling process, the drilling slewing device drives the guide hole drilling tool to rotate so as to realize high-speed drilling or drives the hole expanding drilling tool to rotate so as to realize low-speed high-torque back expansion; the guide rail assembly is arranged on the drill stabilizing support assembly, can realize the adjustment of the drilling position and the drilling direction of the drilling rotary device, and provides required pulling force for the back-expanded drilling hole of the drilling rotary device.
The drill stabilizing support assembly comprises a stand column assembly capable of providing upper support for the drilling machine, a front support assembly capable of providing front support for the drilling machine and a rear support assembly capable of providing rear support for the drilling machine; the stand subassembly is equipped with two sets ofly, and the stand subassembly includes outer cylinder and sets up the inside hydro-cylinder in outer cylinder, and outer cylinder is fixed the big dish of gyration on, the internal inside hydro-cylinder of stand promotes vertical support portion and stretches out and draws back from top to bottom to the realization is to the last support of rig.
The guide rail assembly comprises a guide rail and a linear driving mechanism for driving the guide rail to move back and forth along the corresponding slide way; the angle adjusting device is characterized in that a beam capable of lifting is arranged between the two groups of upright post assemblies, an angle adjusting support in the angle adjusting assembly for adjusting the pitching angle of the guide rail is rotatably connected to the beam, one end of a telescopic mechanism in the angle adjusting assembly is fixed on the large rotary disc, the other end of the telescopic mechanism in the angle adjusting assembly is fixed on the angle adjusting support, and the angle adjusting support is provided with the slide rail for slidably mounting the guide rail.
The drilling slewing device is arranged on the guide rail and is driven by the linear driving mechanism to move back and forth along the guide rail; the drilling slewing device comprises a low-speed large-torque motor, a power adapter and a drill rod connecting assembly, wherein the power adapter is connected with an output shaft of the low-speed large-torque motor, the power adapter is arranged on a guide rail in a sliding mode and used for transmitting torque and push-pull force to the drill rod connecting assembly, and the tail end of the drill rod connecting assembly is connected with a drill rod in a guide hole drilling tool so as to transmit the torque and the push-pull force to the drill rod.
The large-torque drilling machine further comprises a crawler-type chassis, a power system, an operating mechanism and a hydraulic oil tank, wherein the operating mechanism controls each connected executing mechanism to complete actions.
The guide hole drilling tool comprises a drill rod and a guide hole drill bit, and the guide hole drill bit is detachably arranged on the drill rod.
The reaming drilling tool comprises a back reaming drill bit, wherein the back reaming drill bit comprises a cylinder and a connecting rod which is positioned at the center of the cylinder, coaxial with the cylinder and capable of supporting the cylinder, a plurality of cutter arms are obliquely arranged between the cylinder and the connecting rod, the back reaming drill bit is rotated along with a drilling rod, the cutter arms of the back reaming drill bit realize cutting of coal, and a ventilation water pipeline is arranged on the back reaming drill bit to discharge coal cinder.
One end of a connecting rod in the back expansion drill bit is connected with the drill rod, the other end of the connecting rod is connected with a transfer case, the transfer case is a device with two ends capable of independently rotating and transmitting pulling force, one end of the transfer case is connected with the drill rod and then rotates along with the back expansion drill bit, the other end of the transfer case is connected with a connecting pipe, pulling force is generated on the connecting pipe, and the connecting pipe is connected with a gas drainage pipe.
The ventilation water pipeline on the back-expanding drill bit comprises a hollow channel arranged at the center of the connecting rod body and a through hole arranged on the connecting rod body, the through hole is arranged in an area surrounded by the cutter arms, the outer end of the through hole inclines towards the cylinder, and after ventilation or water passing, chips generated by cutting are flushed out in a back-expanding reverse direction by air flow or water flow.
The equipment further comprises a lifting device for lifting the operator to a required height to install the reaming drilling tool and the gas drainage pipe, and the lifting device is further provided with a rotary lifting device for lifting a required heavy object.
The transverse large-diameter pore forming method in the invention comprises the steps of horizontal direction or oblique upward and oblique downward, so as to be different from the step of punching from top to bottom.
Compared with the prior art, the invention effectively solves the problems of difficult operation, low operation efficiency, low pore-forming rate, high labor intensity of workers and the like when the coal pillar of the soft coal seam is transversely formed into a large-diameter hole, realizes the complete set of equipment and has more reliable operation efficiency.
The drilling rotary device adopts the power adapter and the drill rod connecting assembly, so that the torque transmission can be effectively realized, the push-pull force can be effectively transmitted in the back-expanded drill hole, and the low-speed large-torque motor can save the reduction gearbox, so that the whole equipment has a more compact structure and higher force transmission efficiency.
The invention generates larger pulling force in the back-reaming drilling hole, and in order to ensure the stability of the equipment in the process, the invention improves the drill stabilizing support device, so that the drill stabilizing support device is matched with the ground supporting oil cylinder of the drilling machine equipment and supports the drilling machine equipment in multiple directions from top to bottom, front to back, and can effectively improve the stability of the drilling machine equipment in the drilling and back-reaming drilling holes.
The invention adopts the special-designed hole expanding drilling tool in the back expanding drilling hole, and the scraps generated by cutting are discharged along the cutting direction in the back expanding drilling hole, so that the deslagging efficiency during the back expanding reaming can be improved, and the hole expanding efficiency is further improved.
The guide hole drilling tool and the hole expanding drilling tool adopted by the invention can realize the integrated operation of transversely forming holes in the coal pillar area and putting the large-diameter gas drainage pipe into the coal pillar area, effectively shortens the field construction time and improves the efficiency of forming the large-diameter holes in the coal pillar area in the coal mine.
Drawings
FIG. 1 is a schematic structural view of a high torque drill used in the present invention;
FIG. 2 is a schematic structural view of a drill stabilizing support assembly and a guide rail assembly according to the present invention;
FIG. 3 is a side view of the drill stabilizing support assembly and the guide rail assembly of the present invention;
FIG. 4 is a schematic view of the construction of the drilling rotary device of the present invention;
FIG. 5 is a schematic view of the structure of the fixed housing of the power adapter of the present invention;
FIG. 6 is a schematic view of the drill rod coupling assembly of the present invention;
FIG. 7 is a schematic view of a pilot hole drilling tool used for pilot hole drilling;
FIG. 8 is a schematic view of a reamer tool used in back reaming a borehole;
FIG. 9 is a schematic view of a back reamer bit configuration;
FIG. 10 is a schematic view of a gas drainage pipe;
FIG. 11 is a schematic structural view of a tracked lift truck according to the present invention;
FIG. 12 is a schematic structural view of the rotary lifting device of the present invention;
FIG. 13 is a schematic illustration of a pilot hole process for performing a lateral large diameter hole formation using the present invention;
FIG. 14 is a schematic illustration of the back-reaming process for forming a large diameter hole in a transverse direction using the present invention;
the labels in the figure are: 1. a large-torque drilling machine 2, a crawler-type lifting vehicle 3, a guide hole drilling tool 4, a hole expanding drilling tool 5, a gas drainage pipe 6 and a coal pillar;
101. the device comprises a crawler-type chassis, 102, a power system, 103, an operating mechanism, 104, a hydraulic oil tank, 105, a large rotary disc, 106, a drill stabilizing support assembly, 107, a guide rail assembly, 108 and a drilling rotary device;
106-1, a column assembly, 106-1a, a vertical supporting part, 106-1b, an outer column, 106-1c a lifting oil cylinder, 106-1d, a hoop, 106-2, a front supporting assembly, 106-3 and a rear supporting assembly;
107-1, a guide rail, 107-2, an angle adjusting component, 107-2a, an angle adjusting bracket, 107-2b, an angle adjusting oil cylinder, 107-3 and a translation oil cylinder;
108-1, low speed, high torque motor; 108-2, a power adapter, 108-2a, a rotating shaft, 108-2b, a bearing, 108-2c, a sealing structure, 108-2d, a fixed box body, 108-2d-1, a medium inflow interface, 108-2d-2 and a medium outflow interface; 108-3, a drill rod connecting assembly, 108-3a, a transmission and pulling disc, 108-3b, a connecting shaft, 108-3b-1, a radial boss, 108-3c and a gland;
201. a first-stage lifting mechanism 202, a second-stage lifting mechanism 203, a tool groove 204 and a rotary hoisting device; 204-1, a rotating base, 204-2, a vertical column, 204-3, a telescopic cross beam, 204-3a, an internal telescopic oil cylinder, 204-3b, a cross beam outer tube, 204-3c, a cross beam inner tube, 204-4, a slewing gear, 204-5, a lifting rope, 204-6, a fixed pulley, 204-7 and a movable pulley;
301. a drill stem 302, a pilot hole drill bit;
401. the device comprises a connecting rod 401-1, a through hole 402, a cutter arm 403, a cylinder 404, a transfer case 405 and a connecting pipe;
501. short section 502 and fixing hole.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.
Referring to the attached drawings, the complete equipment for the transverse large-diameter hole forming in the coal pillar area of the soft coal seam comprises a large-torque drilling machine 1, a crawler-type lifting vehicle 2, a drilling tool set and a gas drainage pipe 5, wherein the drilling tool set comprises a guide hole drilling tool 3 and a hole expanding drilling tool 4, the guide hole drilling tool 3 is used for small-hole-diameter guide hole operation, and the hole expanding drilling tool 4 is used for small-hole-diameter back expansion after the guide hole operation is completed so as to obtain a large-diameter hole.
As shown in fig. 1 to 6, which are schematic structural diagrams of the whole body and each component of the high-torque drilling machine, the high-torque drilling machine 1 includes a crawler chassis 101, a power system 102, an operating mechanism 103, a hydraulic oil tank 104, a large rotary disc 105, a drill stabilizing support assembly 106, a guide rail assembly 107 and a drilling slewing device 108. Wherein the tracked chassis 101, the power system 102, the operating mechanism 103 and the hydraulic tank 104 are used as common chassis components, the tracked lift truck 2 of the present invention also uses the same chassis components, and the working principle thereof is also the same.
The crawler-type chassis 101 comprises a crawler traveling mechanism and ground supporting oil cylinders, free movement of the equipment is realized through the crawler traveling mechanism, and meanwhile, the support function of the equipment is realized through the ground supporting oil cylinders arranged at four corners of the crawler chassis 101; the power system 102 is fixed on the crawler chassis 101 and comprises a motor and a hydraulic pump, the motor rotates to drive the hydraulic pump to rotate, so that the hydraulic pump can suck low-pressure oil from the hydraulic oil tank 104 and do work to output high-pressure oil; the operating mechanism 103 is used for reversing, regulating flow, regulating pressure and the like on high-pressure oil output by a hydraulic pump in the power system so as to enable the hydraulic oil to enter an executing mechanism and drive the executing mechanism to act, and the executing mechanism is each oil cylinder arranged on the equipment; the hydraulic oil tank 104 is fixed on the crawler chassis 101, and provides low-pressure oil for a hydraulic pump of the power system 102, and the stored hydraulic oil and the tank body of the oil tank are used for cooling the hydraulic oil after work is done.
The large rotary disc 105 is arranged on the crawler chassis 101, is driven to rotate by a hydraulic motor and drives other mechanisms arranged on the large rotary disc 105 to rotate so as to adjust the drilling angle; meanwhile, the large rotary disc 105 is connected with the chassis, so that the upright post assembly 106-1 in the drill stabilizing support assembly 106 can directly apply force to the crawler chassis 101 when being supported upwards, and the stability of the equipment during construction is maintained.
Two groups of upright post assemblies 106-1 in the drill stabilizing support assembly 106 are arranged, each upright post assembly 106-1 comprises an outer post body 106-1b fixed on the large rotary disc 105, an inner oil cylinder is arranged in a post cavity of each outer post body 106-1b and can drive a connected vertical support portion 106-1a to vertically extend and retract so as to tightly prop against a top plate above the outer post body, an upper support plate is arranged at the top end of each vertical support portion 106-1a, and a conical fixing head protruding out of the plate surface is arranged on each upper support plate to improve the support stability.
A cross beam is further arranged between the outer columns 106-1b of the two upright column assemblies 106-1, two ends of the cross beam are slidably sleeved on the outer columns 106-1b through hoops 106-1d, the hoops 106-1d are fixedly connected with the cylinder body of the lifting oil cylinder 106-1c, and the cross beam can be lifted after a piston of the lifting oil cylinder 106-1c extends downwards.
The guide rail assembly 107 comprises a guide rail 107-1, the guide rail 107-1 is mounted on the cross beam through an angle adjusting assembly 107-2, the angle adjusting assembly 107-2 comprises an angle adjusting support 107-2a and an angle adjusting oil cylinder 107-2b, one end of the angle adjusting support 107-2a is hinged to the cross beam, the other end of the angle adjusting support 107-2a is rotatably connected with a piston of the angle adjusting oil cylinder 107-2b, the end part of a cylinder body of the angle adjusting oil cylinder 107-2b is hinged to the large rotary disc 105, and under the telescopic action of the angle adjusting oil cylinder 107-2b, the adjustment of the pitch angle of the angle adjusting support 107-2a can be realized.
The guide rail 107-1 is slidably arranged on a slideway of the angle adjusting bracket 107-2a, the guide rail 107-1 moves back and forth on the slideway by the arranged translation oil cylinder 107-3, the cylinder body of the translation oil cylinder 107-3 is fixed on the angle adjusting bracket 107-2a, and the piston is fixedly connected with the guide rail 107-1. The guide rail 107-1 is provided with a drilling tool for drilling and a drilling slewer 108 for driving the drill rod to rotate, and the angle adjusting component 107-2 adjusts the angle adjusting bracket 107-2a, so that the pitch angle of the guide rail 107-1 is adjusted, and the drilling direction of the drilling tool is further adjusted.
The drill stabilizing support assembly 106 further comprises a front support assembly 106-2 and a rear support assembly 106-3 which are arranged at the front end and the rear end of the guide rail 107-1, in the embodiment, the front support assembly 106-2 is fixed at the front end of the guide rail 107-1, when the guide rail 107-1 moves forwards, a front support plate in the front support assembly 106-2 is supported on a coal pillar in front, a telescopic oil cylinder is arranged in the rear support assembly 106-3, the telescopic oil cylinder is arranged between the upper plane and the lower plane of the guide rail 107-1, a piston of the telescopic oil cylinder is connected with the rear support plate, and the rear support plate extends backwards to be supported on a coal wall or a rock wall through the action of the telescopic oil cylinder; front and rear support of the device is thus achieved by front support assembly 106-2 and rear support assembly 106-3.
In implementation, the front support assembly 106-2 can also be controlled by the telescopic cylinder to move back and forth, and the rear support assembly 106-3 is fixed at the rear end of the guide rail 107-1.
Furthermore, all be equipped with a plurality of protrusions in the toper fixed head of face on preceding backup pad and the back backup pad, when supporting, can increase and the coal column, coal wall or the rock-wall between the frictional force, improve the stability of supporting.
The drilling slewing device 108 adopts a low-speed large-torque motor 108-1, a power adapter 108-2 for transmitting torque and push-pull force and a drill rod connecting assembly 108-3, the power adapter 108-2 comprises a fixed box 108-2d, a rotating shaft 108-2a and a bearing 108-2b, the fixed box 108-2d is fixedly connected with the body of the low-speed large-torque motor 108-1, the rotating shaft 108-2a is rotatably installed inside the stationary case 108-2d through a bearing 108-2b, one end of the rotating shaft 108-2a and the output shaft of the low-speed large-torque motor 108-1 are directly connected through a spline or a flat key, to transmit torque, the other end of the rotating shaft 108-2a is connected to the drill pipe 301 through the drill pipe connecting assembly 108-3 to transmit torque and push-pull force to the drill pipe 301.
The bottom of the fixed box 108-2d is connected with a propulsion oil cylinder on the guide rail 107-1, and the propulsion oil cylinder pushes the drilling slewing device 108 to move back and forth along the guide rail 107-1, so that drilling and back expansion of the drilling tool are realized.
In order to cool the bearing 108-2b, a cooling medium which circularly flows is connected into the fixed box 108-2d, so that the fixed box 108-2d is respectively provided with a medium inflow interface 108-2d-1 and a medium outflow interface 108-2d-2, and a sealing structure 108-2c is arranged between the box cover at the two ends of the fixed box 108-2d and the rotating shaft 108-2a to prevent the cooling medium from leaking.
The bearings 108-2b are tapered roller bearings and are arranged at two ends of the rotating shaft 108-2a in pairs, so that the rotating shaft 108-2a can rotate and can transmit axial push-pull force.
The drill rod connecting assembly 108-3 comprises a transmission and pulling disc 108-3a, a connecting shaft 108-3b and a pressing cover 108-3c, wherein an external thread is processed at the end part of a rotating shaft 108-2a on the power adapter 108-2, an internal thread matched with the transmission and pulling disc 108-3a is processed on the transmission and pulling disc 108-3a, the transmission and pulling disc 108-3a is fixed on the outer side of the rotating shaft 108-2a through threaded connection so as to realize the transmission of the push-pull force, a plurality of threaded holes are formed in the end surface of the transmission and pulling disc 108-3a along the circumferential direction, and the connection and the torque transmission are realized by the end part or the end surface of the rotating shaft 108-2a and one end of the connecting; one end of the connecting shaft 108-3b is provided with a radial boss 108-3b-1, the end face of the connecting shaft is matched with the rotating shaft 108-2a to transmit torque, and the other end of the connecting shaft 108-3b is connected with the drill rod 301; the gland 108-3c is a hollow revolving body, the center of the gland is hollow, the gland can be sleeved on the connecting shaft 108-3b until the gland is clamped at the position of a radial boss 108-3b-1 of the connecting shaft 108-3b, a plurality of round holes are uniformly distributed on the end face of the gland 108-3c along the circumference, the number of the round holes is consistent with that of threaded holes on the transmission and pulling disc 108-3a, then bolts penetrate through the round holes and are in threaded connection with the threaded holes of the transmission and pulling disc 108-3a, and the connecting shaft 108-3b is pressed on the end face of the rotating shaft 108-2a, so that the push-pull force of the rotating shaft 108-2a can be transmitted to the connecting shaft 108-3b by; the end of the rotating shaft 108-2a is provided with a male spigot, the end of the corresponding connecting shaft 108-3b is provided with a female spigot matched with the male spigot, and the male spigot and the female spigot are matched to position the connecting shaft 108-3b so as to ensure the coaxiality of the connecting shaft 108-3b and the rotating shaft 108-2 a.
The torque transmission structure realizes the transmission of torque through convex-concave matching, for example, a structure of matching a spline and a key groove, wherein the spline is arranged on the rotating shaft 108-2a, the key groove is arranged on the connecting shaft 108-3b, or the spline is arranged on the connecting shaft 108-3b, and the key groove is arranged on the rotating shaft 108-2 a; or the torque transmission structure is a matching structure of a boss similar to a spline and a groove, or can be a cylindrical pin structure, pin holes for mounting cylindrical pins are formed in the end face of the rotating shaft 108-2a and the end face of the connecting shaft 108-3b, and two ends of each cylindrical pin are respectively fixed in the pin holes in the end face of the rotating shaft 108-2a and the end face of the connecting shaft 108-3 b.
For the positioning of the connecting shaft 108-3b, the positioning can also be performed indirectly, that is, the positioning is realized through the gland 108-3c, specifically: the rotating shaft 108-2a and the gland 108-3c are matched through a spigot structure to position the gland 108-3c, and the gland 108-3c and the connecting shaft 108-3b are matched through a spigot structure to position the connecting shaft 108-3b through the gland 108-3c, so that the connecting shaft 108-3b and the rotating shaft 108-2a are ensured to be coaxial.
The installation of the drill rod 301 and the connecting shaft 108-3b adopts a form common in the field, namely, the end of the connecting shaft 108-3b is processed into a conical surface to realize the fixed installation with the drill rod 301.
In order to facilitate the disassembly of the gland 108-3c, the gland 108-3c is further provided with a disassembly hole, which can be a threaded hole, so that when the gland 108-3c is disassembled, a bolt can be screwed into the disassembly hole and pushed against the driving plate 108-3a, and the bolt is continuously screwed, so that the ejection disassembly of the gland 108-3c can be realized.
When the large-torque drilling machine is constructed, the equipment is moved to a construction position through the crawler chassis 101, and the operating mechanism 103 drives the rotary large disc 105 to adjust the angle, so that the guide rail 107-1 faces the coal pillar for construction; the ground supporting oil cylinders on the crawler chassis 101 are controlled by the operating mechanism 103 to support the ground, the vertical supporting parts 106-1a of the upright post assemblies 106-1 are controlled to extend upwards to support the top of the coal wall, and the up-and-down support of the equipment is completed; the angle adjusting oil cylinder 107-2b of the angle adjusting assembly 107-2 is driven by the operating mechanism 103 to adjust the inclination angle of the guide rail 107-1, so that the guide rail 107-1 reaches the construction angle; the operating mechanism 103 drives the translation oil cylinder 107-3 to enable the guide rail 107-1 to move forwards until a front support assembly 106-2 at the front end of the guide rail 107-1 can be supported on a coal pillar, and then the operating mechanism 103 drives the telescopic oil cylinder in the guide rail 107-1 to enable a rear support plate of the rear support assembly 106-3 to extend backwards and support on the coal wall, so that the front and rear support of the guide rail 107-1 are realized; after the guide rail is supported, the drilling tool is driven to rotate by the drilling slewing device 108, and meanwhile, the drilling slewing device 108 is driven to advance along the guide rail 107-1 by a propulsion oil cylinder in the guide rail 107-1, so that drilling of the drilling tool is realized; after the drilling of the equipment is completed through a drilling tool, a back-expansion drill bit is installed on the other side of the coal pillar, so that back expansion of the drill bit can be performed, and at the moment, a propelling oil cylinder in a guide rail 107-1 can be used for pulling up a drilling slewing device 108 to realize back expansion drilling of the equipment; the drilling slewing device 108 utilizes the low-speed large-torque motor 108-1 to drive the drilling tool to rotate through the power adapter 108-2, so that the low-speed stability of the equipment during back-reaming drilling is ensured, and the operation efficiency of the equipment is improved.
Fig. 7 to 9 are schematic structural views of the pilot hole drilling tool 3 and the reaming drilling tool 4.
As shown in fig. 7, the pilot hole drilling tool 3 includes a drill rod 301 and a pilot hole drill 302, and the pilot hole drill 302 is detachably mounted on the drill rod 301.
As shown in fig. 8 and 9, the reaming bit 4 includes a back reaming bit, the back reaming bit includes a cylinder 403 and a connecting rod 401 which is located in the center of the cylinder 403, is coaxial with the cylinder 403, and can support the cylinder 403, a plurality of cutter arms 402 are obliquely arranged between the cylinder 403 and the connecting rod 401, the cutter arms 402 of the back reaming bit realize cutting of coal bodies during the process that the back reaming bit is installed on the drill rod 301 and rotates along with the drill rod 301, and a ventilation water pipeline is arranged on the back reaming bit to discharge coal cinder.
One end of a connecting rod 401 in the back expansion drill bit is connected with the drill rod 301, the other end of the connecting rod is connected with a transfer case 404, the transfer case 404 is a device with two ends capable of independently rotating and transmitting pulling force, one end of the transfer case 404 is connected with the connecting rod 401 of the back expansion drill bit and rotates along with the back expansion drill bit, the other end of the transfer case 404 is connected with a connecting pipe 405 to generate pulling force on the connecting pipe 405 without transmitting torsion, and the connecting pipe 405 is connected with a gas drainage pipe 5.
The ventilation water passage on the back-expanding drill bit comprises a hollow channel arranged in the center of the rod body of the connecting rod 401 and a through hole 401-1 arranged on the rod body of the connecting rod 401, the through hole 401-1 is arranged in an area surrounded by the cutter arms 402, the outer end of the through hole 401-1 inclines towards the cylinder 403, and after ventilation or water passing, chips generated by cutting are flushed out of the through hole 401-1 in a back-expanding reverse direction by air flow or water flow.
The gas drainage pipes 5 used in the invention are increased one by one according to the drilling length and the drilling speed, each gas drainage pipe 5 has a structure as shown in figure 10, one end of the pipe body of the gas drainage pipe 5 is provided with a short section 501 with the diameter smaller than that of the pipe body, the short section 501 can be inserted into the end part of another gas drainage pipe 5, after the short section 501 is inserted, the outer wall of the short section 501 is attached to the inner wall of the pipe body of another gas drainage pipe 5, after the adjacent gas drainage pipes 5 are aligned through the pipe body and a fixing hole 502 arranged on the short section 501, the adjacent gas drainage pipes are fixed by a fastener, and the fastener is usually selected to be a fixing bolt or a rivet for anchoring and the.
In the implementation, the drill rod 301 is connected with the drilling rotary device 108, the small-diameter guide hole operation of the coal pillar is carried out by using the guide hole drill bit 302, after the guide hole drill bit 302 penetrates through the coal pillar, the guide hole drill bit 302 is removed in the operation area on the other side of the coal pillar, the back expansion drill bit is installed, the drill rod 301 retreats while rotating, the back expansion drill bit rotates to cut the coal body through the cutter arm 402, and the coal slag is discharged through the ventilation water pipeline while cutting, so that the construction pressure of the drilling equipment is reduced. Thus, the invention can realize the integrated operation of drilling, guiding hole, back expanding and casing on the coal pillar.
When installing the reamer 4, the equipment needs to be raised to bring the operator and the material to the required height. Therefore, the invention also uses a crawler-type lifting vehicle 2, as shown in fig. 11 and 12, the crawler-type lifting vehicle 2 adopts the same chassis structure as the large-torque drilling machine 1 shown in fig. 1, and a lifting platform 201 and a rotary lifting device 204 are arranged on the chassis structure, a telescopic oil cylinder in the lifting platform is telescopic under the control of an operating mechanism, and the lifting of the platform is controlled, and the crawler-type lifting vehicle 2 has the function of conveying an operator to a proper height; the rotary lifting device 204 can rotate left and right under the action of external force, a hydraulic motor is installed at the upper end of the rotary lifting device 204, the rope of the lifting device is folded and unfolded through rotation of the hydraulic motor, and lifting of a heavy object hung at the front end of the rope is achieved.
Still be equipped with second grade elevating platform 202 on the lift platform 201, second grade elevating platform 202 top is equipped with tool groove 203 for place the material to support gas drainage pipe 5 etc. prevent the roll of gas drainage pipe 5.
The rotary lifting device 204 comprises a rotary base 204-1, a vertical column 204-2, a telescopic cross beam 204-3, a cross beam outer tube 204-3b, a cross beam inner tube 204-3c and a lifting rope 204-5. The rotating base 204-1 is fixed on the crawler-type chassis 101, a rotating sleeve capable of freely rotating is arranged on the rotating base 204-1, the upright column 204-2 is connected with the rotating sleeve of the rotating base 204-1 through a cross beam perpendicular to the upright column 204-2, the bottom of the upright column 204-2 is arranged on a circular track, and the upright column 204-2 can rotate 360 degrees around the rotating base 204-1 on the circular track under the action of external force; the upper end of the upright column 204-2 is also provided with a rotating mechanism and is connected with the beam outer tube 204-3b of the telescopic beam 204-3, so that the telescopic beam 204-3 rotates around the upright column 204-2 under the action of external force; the telescopic cross beam 204-3 comprises a cross beam outer tube 204-3b, a cross beam inner tube 204-3c and an internal telescopic oil cylinder 204-3a, and the cross beam inner tube 204-3c realizes the front and back telescopic of the cross beam inner tube 204-3c under the action of the internal telescopic oil cylinder 204-3a, so that the lifting range of the lifting hook is effectively increased; the telescopic inner pipe 204-3c is provided with a static pulley 204-6, a lifting rope 204-5 passes through a movable pulley 204-7 on a lifting hook after passing through the static pulley 204-6 from the roller and then is fixed at the front end of the cross beam inner pipe 204-3c, and the slewing device 204-4 rotates through the roller to receive and release the rope, so that the lifting hook is lifted. When the lifting hook is used, the upright column 204-2 is rotated to a proper position through external force, then the lifting hook is dragged to rotate the telescopic cross beam 204-3 to a proper position through the external force, the rotary device 204-4 is used for driving the rotary drum to rotate, the lifting rope 204-5 is released, the lifting hook is lowered, and after a heavy object is hung on the lifting hook, the rotary device 204-4 is used for driving the rotary drum to recover the lifting rope 204-5, so that the heavy object is raised.
The technology for transversely forming the large-diameter hole in the coal pillar area of the soft coal seam by using the method comprises a guide hole process and a back expansion process.
In the guide hole process, as shown in fig. 13, in a construction site, firstly, a large-torque drilling machine 1 is driven to a roadway on the left side of a coal pillar, and stable drilling and hole finding operations are carried out in the roadway; then, the drill rod 301 and the guide hole drill bit 302 are drilled into the coal pillar by the large-torque drilling machine 1, and the large-torque drilling machine 1 is pushed forward under the action of the pushing oil cylinder until the guide hole drill bit 301 is drilled through the coal pillar and enters the operation area on the right side of the coal pillar.
In the operation area on the right side of the coal pillar, the operator rides the crawler-type lifting vehicle 2 to lift to a corresponding position while guiding the hole, so that the drill bit is convenient to replace, and then the rotary lifting device 204 is used for lifting the required materials to the position of the tool groove 203, so that the materials are prepared for the back expansion process.
In the back expansion process, as shown in fig. 14, the pilot hole drill bit 302 is removed, a back expansion drill bit is installed, and when the back expansion drill bit is about to enter a coal pillar, a transfer case 404, a connecting pipe 405 and a gas drainage pipe 5 are sequentially installed; then, the large-torque drilling machine 1 drives the drill rod 301 to drive the back-expanding drill bit to retreat while rotating, meanwhile, the transfer case 404 drags the connecting pipe 405 connected with the transfer case and the gas drainage pipe 5 connected with the connecting pipe 405 to retreat into the coal pillar, in the process that the gas drainage pipe 5 enters the coal pillar, the gas drainage pipe 5 is installed one by using the secondary lifting platform 202 of the crawler-type lifting vehicle 2 until the whole coal pillar completes installation of the gas drainage pipe 5, at the moment, the back-expanding drill bit exits from drilling holes to obtain large-diameter pore-forming holes, the expanding drilling tool 4 is removed, then the equipment is moved to the next hole site, the guide hole drilling tool 3 is installed again, and construction is continued.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.

Claims (11)

1. A technology for transversely forming large-diameter holes in a coal pillar area of a soft coal seam is characterized by comprising the following steps of: the method comprises a guide hole process and a back expansion process;
(1) in the process of guiding the coal pillar, the drilling machine drills a guide hole drilling tool (3) into the coal pillar in an operation area on one side of the coal pillar and continuously pushes forwards until a guide hole drilling bit (302) on the guide hole drilling tool (3) drills through the coal pillar and enters an operation area on the other side of the coal pillar;
(2) in the back expansion process, a guide hole drill bit (302) on a drill rod (301) of a guide hole drilling tool (3) is detached and replaced by a back expansion drill bit, and when the back expansion drill bit is about to enter a coal pillar, a transfer case (404), a connecting pipe (405) and a gas drainage pipe (5) are sequentially arranged on the back expansion drill bit; then the drilling machine drives the back-expanding drill bit to retreat while rotating, meanwhile, the transfer case (404) drags the connecting pipe (405) connected with the transfer case and the gas drainage pipe (5) connected with the connecting pipe (405) to enter the coal pillar, the gas drainage pipe (5) is installed one by one in the process that the gas drainage pipe (5) enters the coal pillar until the whole coal pillar completes the installation of the gas drainage pipe (5), at the moment, the back-expanding drill bit exits from the drilling hole to obtain a large-diameter hole, the back-expanding drill bit, the transfer case (404) and the connecting pipe (405) are dismantled, the guide hole drill bit (302) is installed on the drill rod (301) again, and the drilling machine is moved to the next hole site to continue construction.
2. The utility model provides a suit of equipment of horizontal major diameter pore-forming in soft coal seam coal pillar district, includes big moment of torsion rig (1), guide hole drilling tool (3) and reamer drilling tool (4), its characterized in that: the high-torque drilling machine (1) comprises a drill stabilizing support assembly (106), a guide rail assembly (107) and a drilling rotary device (108); the drill stabilizing support assembly (106) is arranged on a large rotary disc (105) of the high-torque drilling machine (1) and is used for providing front, rear and upper supports for the drilling machine in the drilling process; the drilling slewing device (108) is arranged on the guide rail assembly (107), and according to the drilling process, the drilling slewing device (108) drives the guide hole drilling tool (3) to rotate to realize high-speed drilling or drives the hole expanding drilling tool (4) to rotate to realize low-speed high-torque back expansion; the guide rail assembly (107) is installed on the drill stabilizing support assembly (106), and the guide rail assembly (107) can adjust the drilling position and direction of the drilling rotary device (108) and provide required pulling force for back-reaming of the drilling rotary device (108).
3. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 2, wherein: the drill stabilizing support assembly (106) comprises a column assembly (106-1) capable of providing upper support for the drilling machine, a front support assembly (106-2) capable of providing front support for the drilling machine, and a rear support assembly (106-2) capable of providing rear support for the drilling machine; the upright post assemblies (106-1) are provided with two groups, each upright post assembly (106-1) comprises an outer column body (106-1 b) and an inner oil cylinder arranged in the outer column body (106-1 b), the outer column body (106-1 b) is fixed on the large rotary disc (105), and the inner oil cylinder in the upright column body (106-1 b) pushes the vertical supporting part (106-1 a) to stretch up and down so as to realize upper support of the drilling machine.
4. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 3, wherein: the guide rail assembly (107) comprises a guide rail (107-1) and a linear driving mechanism for driving the guide rail (107-1) to move back and forth along a corresponding slide way; a lifting beam is arranged between the two groups of upright post assemblies (106-1), an angle adjusting support (107-2 a) in an angle adjusting assembly (107-2) for adjusting the pitch angle of the guide rail (107-1) is rotatably connected to the beam, one end of a telescopic mechanism in the angle adjusting assembly (107-2) is fixed on the rotary large disc (105), the other end of the telescopic mechanism is fixed on the angle adjusting support (107-2 a), and the slide way is arranged on the angle adjusting support (107-2 a) to slidably install the guide rail (107-1).
5. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 4, wherein: the drilling rotary device (108) is arranged on the guide rail (107-1) and is driven by a linear driving mechanism to move back and forth along the guide rail (107-1); the drilling rotary device (108) comprises a low-speed large-torque motor (108-1), a power adapter (108-2) and a drill rod connecting assembly (108-3), wherein the power adapter (108-2) is connected with an output shaft of the low-speed large-torque motor (108-1), the power adapter (108-2) is arranged on a guide rail (107-1) in a sliding mode and used for achieving transmission of torque and push-pull force to the drill rod connecting assembly (108-3), and the tail end of the drill rod connecting assembly (108-3) is connected with a drill rod (301) in the guide hole drilling tool (3) so as to achieve transmission of the torque and the push-pull force to the drill rod.
6. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 2, wherein: the large-torque drilling machine (1) further comprises a crawler-type chassis (101), a power system (102), an operating mechanism (103) and a hydraulic oil tank (104), wherein the operating mechanism (103) controls each connected executing mechanism to complete actions.
7. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 2, wherein: the pilot hole drilling tool (3) comprises a drill rod (301) and a pilot hole drill bit (302), wherein the pilot hole drill bit (302) is detachably arranged on the drill rod (301).
8. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 2, wherein: reamer (4) are including returning the reaming bit, return the reaming bit and include cylinder (403) and be located cylinder (403) center and with cylinder (403) coaxial, and can support connecting rod (401) of cylinder (403), slope between cylinder (403) and connecting rod (401) and set up a plurality of arms (402), return the reaming bit and install on drilling rod (301) and along with drilling rod (301) rotation process, return the cutting of reaming bit arm (402) realization to the coal body, and return and be equipped with ventilation water pipeline on the reaming bit to discharge the cinder.
9. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 8, wherein: one end of a connecting rod (401) in the back expansion drill bit is connected with the drill rod (301), the other end of the connecting rod is connected with a transfer case (404), the transfer case (404) is a device with two ends capable of independently rotating and transmitting pulling force, one end of the transfer case (404) is connected with the drill rod and then rotates along with the back expansion drill bit, the other end of the transfer case (404) is connected with a connecting pipe (405) to generate pulling force on the connecting pipe (405), and the connecting pipe (405) is connected with a gas drainage pipe (5).
10. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 8, wherein: the ventilation water passage on the back-expanding drill bit comprises a hollow channel arranged at the center of a rod body of the connecting rod (401) and a through hole (401-1) arranged on the rod body of the connecting rod (401), the through hole (401-1) is arranged in an area surrounded by the cutter arms (402), the outer end of the through hole (401-1) inclines towards the cylinder body (403), and after ventilation or water passing, chips generated by cutting are flushed out in the back-expanding direction by air flow or water flow.
11. The complete set of equipment for forming the transverse large-diameter hole in the coal pillar area of the soft coal seam as claimed in claim 2, wherein: the device further comprises a lifting device for lifting the operator to a required height to install the reaming tool (4) and the gas drainage pipe (5), and the lifting device is further provided with a rotary lifting device (204) for lifting a required heavy object.
CN202010164009.1A 2020-03-11 2020-03-11 Complete equipment for transverse large-diameter hole forming in coal pillar area of soft coal seam and hole forming process Pending CN111140170A (en)

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CN202010164009.1A CN111140170A (en) 2020-03-11 2020-03-11 Complete equipment for transverse large-diameter hole forming in coal pillar area of soft coal seam and hole forming process

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Application Number Priority Date Filing Date Title
CN202010164009.1A CN111140170A (en) 2020-03-11 2020-03-11 Complete equipment for transverse large-diameter hole forming in coal pillar area of soft coal seam and hole forming process

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111827880A (en) * 2020-07-23 2020-10-27 平顶山日欣机械制造有限公司 Drilling, punching and expanding integrated hydraulic drilling machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111827880A (en) * 2020-07-23 2020-10-27 平顶山日欣机械制造有限公司 Drilling, punching and expanding integrated hydraulic drilling machine

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