CN101315021B

CN101315021B - Automatic reducing borehole-enlarging drilling tool

Info

Publication number: CN101315021B
Application number: CN2007101066735A
Authority: CN
Inventors: 蔡成功; 马丕梁
Original assignee: China Coal Research Institute CCRI
Current assignee: China Coal Research Institute CCRI
Priority date: 2007-05-29
Filing date: 2007-05-29
Publication date: 2011-11-02
Anticipated expiration: 2027-05-29
Also published as: CN101315021A

Abstract

An automatic diameter changing and hole enlarging drilling tool, which is used for the outburst prevention measures for constructing the large-diameter drilling holes and the gas drainage drilling holes in a coal seam, can eliminate the induced outburst risk for the one-time large-diameter drilling hole construction and further improve the effect of the outburst prevention measures and the gas drainage effect. The automatic diameter changing and hole enlarging drilling tool is composed of a front drill body, a rear drill body, a connecting nut, a sliding sleeve, a cutting tool carrier and a supporting tool carrier in (figure 1). When normal drilling is performed, the supporting tool carrier and the cutting tool carrier are respectively fixed on the front and the rear drill bodies, and thesmall-diameter holes are drilled by a common drill bit; when the hole enlarging operation is performed, the rear drill body is drawn out of the front drill body for a certain distance under the action of the extraction pulling force, the supporting tool carrier is unlocked; and under the actions of the resistance force of the hole wall of the drilling hole and the rotating centrifugal force, the sliding sleeve is moved backwards, the supporting tool carrier and the cutting tool carrier are propped open, and then drilling and hole enlarging operations can be performed. At the hole sealing section of the gas drainage drilling hole, the drilling machine stops rotating, the drilling tool is directly pulled out, and a hole opening with a small diameter is formed, thereby conducing to the hole sealing.

Description

Automatic reducing borehole-enlarging drilling tool

Technical field

The present invention relates to a kind of automatic diameter changing reducing drilling tool, be used for the colliery in outburst prevention measures boring of outburst danger coal seam construction major diameter and the boring of coal containing methane gas layer construction large-diameter extraction methane, eliminate the large diameter borehole of directly constructing and induce coal and gas outburst danger, improve the protrusion-dispelling effect and the effect that draws out methane.

Background technology

At present, to mainly contain Patent Office of the People's Republic of China's application number with reducing borehole-enlarging drilling tool be that 96226431.8 " reducing borehole-enlarging drilling tool " and application number are 03245809.6 " automatic reducing borehole-enlarging drilling tool " in China's coal-mine gas preventing and control field.

" reducing borehole-enlarging drilling tool " invention people is Wang Kuijun, Cai Chenggong, Xin Xinping, Xu Zhaoze.This drilling tool purpose is in projecting coal bed construction major diameter outburst prevention measures boring and construction major diameter extraction boring, improves the gas drainage under suction effect, eliminate beat large diameter borehole induce gas outburst danger problem in, the young aperture of retaining hole is beneficial to the sealing of hole that draws out methane and hole.This drilling tool is made up of preceding drill body, back drill body, cutter hub, spring leaf, spacing ring etc., and when creeping into, fixed claw, alignment pin are fixed on cutter hub on the drill body; After boring is got at the bottom of the hole, strengthen rig thrust, alignment pin is cut off, and by spring cutter hub is flicked, cutter hub is realized ream operation under spring force and rotary centrifugal force effect.This drilling tool need be sheared alignment pin, and every dozen of borings need be taken drilling tool apart, changes alignment pin, and mounting process complexity, practicality are poor slightly; And, bore in the process of drilling, needed to be grasped rig thrust, driller's technical operation level is required too high, mistake is cut alignment pin and is happened occasionally in drilling process forward.

" automatic reducing borehole-enlarging drilling tool " invention Ren Wei Xin Xinping, history are talented etc., it is the automatic reducing borehole-enlarging drilling tool of construction gas extraction hole under a kind of coal mine, comprise compositions such as preceding drill body, cutter hub, back drill body, spacing ring, coupling nut, preceding drill body is connected with coupling nut by spacing ring with the back drill body, cutter hub is fixed on the preceding drill body by pivot pin, back drill body is provided with sliding wedge, when normally creeping into, sliding wedge withstands on the inwall of cutter hub afterbody, cutter hub is fixed on the drill body of back, and during trip-out, sliding wedge withdraws from, cutter hub opens, and realizes ream operation under the rotary centrifugal force effect.This drilling tool is the same with " reducing coal-unloading drill ", realizes ream operation by rotary centrifugal force merely, and the reaming time is long, and boring aperture is difficult to be guaranteed.

Above-mentioned two kinds of borehole-enlarging drilling tools fail to be used widely in Coal Production owing to problems such as practicality so far.

Summary of the invention

For overcome the existing automatic reducing borehole-enlarging drilling tool reaming time long, boring aperture can't guarantee, the deficiency of poor practicability, the invention provides the quadric chain automatic reducing borehole-enlarging drilling tool of a kind of brand-new principle, brand new, this borehole-enlarging drilling tool is under the situation that does not need other auxiliary operation, can carry out ream operation automatically with the moving forward and backward of rig.

The present invention solves and realizes that the technical scheme that the automatic diameter changing ream operation is adopted is: form quadric chain by preceding drill body, back drill body, support knife rest, cut knife rest, and simple in structure.Drilling tool is made up of preceding drill body 1, back drill body 2, attaching nut 3, sliding sleeve 4, cut knife rest 5, support knife rest 6, connecting pin 7, cottor pin 8 and carbide alloy pick 9 etc.The attaching nut connects preceding drill body, back drill body; Connecting pin and cottor pin are fixed on sliding sleeve, cut knife rest and support knife rest on the forward and backward drill body.Support the control inclined-plane on the knife rest, the maximum opening angle of restriction cut knife rest and support knife rest, the design counter bore diameter of realization drilling tool.The rotation of forward and backward drill body is transmitted by six sides in the preceding drill body and outer six sides of back drill body, and the rotation of sliding sleeve and back drill body comes transfer torque by key and sliding sleeve internal keyway on the drill body of back.These drilling tool characteristics are: once creep into, twice pore-forming keeps the 75mm of design to the normal boring aperture of 90mm minor diameter when promptly advancing; Retreat when pulling out of hole, while the reaming that pulls out of hole, 150mm is to the 300mm large diameter borehole in construction.

Counter bore diameter can design different control bevel angles and realize series boring counter bore diameter according to the design needs.

The invention has the beneficial effects as follows that drilling tool structure is simple, the reaming reliable in action can be under the situation of less important work, in the rig operation that moves forward and backward be, automatically finish the size diameter conversion, effectively realize ream operation, and bore diameter there is abundant assurance.

Description of drawings

Fig. 1 is the automatic reducing borehole-enlarging drilling tool structure and normally creeps into the work operations view.

Fig. 2 is an automatic reducing borehole-enlarging drilling tool trip-out ream operation working state schematic representation.

1. preceding drill bodies, 2. back drill body, 3. attaching nut, 4. sliding sleeve, 5. cut knife rest among the figure; 6. support knife rest, 7. connecting pin, 8. cottor pin, 9. carbide alloy pick, 10. before drill body control inclined-plane.

The specific embodiment

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is for the reducing borehole-enlarging drilling tool structure and normally creep into the work operations view.The common drill bit of diameter 75-90mm is installed at the automatic reducing borehole-enlarging drilling tool front end.When normally creeping into, back drill body 2 is under the rig thrust, in the preceding drill body 1 of deep insertion, knife rest 6 lockings will be supported in back drill body 2 front portions, support knife rest and hold tightly on preceding drill body 1, cut knife rest 5 is held tightly on the drill body 1 of back by connecting pin 7 and support knife rest 6, this moment, linkage can't open, the bore diameter of this moment is the Machine Design diameter of reducing borehole-enlarging drilling tool, is 75-90mm.When normally creeping into, drilling tool supports the boring deflection behind the knife rest front end carbide alloy pick cutting bit cut, bore diameter depends on the drilling tool diameter, the design of drilling tool diameter has 75mm and two kinds of specifications of 90mm, can design serial diameter drilling tool as required, but minimum diameter is subjected to part strength and requires restriction, is not less than 75mm.

Fig. 2 is a trip-out ream operation drilling tool work operations view.During trip-out, plaing under the force pulling effect of rig, back drill body 2 is pulled out 25-30mm in the drill body 1 in the past backward, and cut knife rest 5 and support knife rest 6 open under borehole wall resistance and rotary centrifugal force effect, sliding sleeve drill body direction forward moves, linkage outwards opens, and cut knife rest 5 fully opens up into the design maximum gauge rising under force pulling, borehole wall resistance and the rotary centrifugal force acting in conjunction, at this moment, pull out of hole on one side,, realize ream operation Yi Bian the cut knife rest cuts borehole wall backward.During ream operation, the carbide alloy pick cutting drill hole wall on the drilling tool cut knife rest.Specifications such as counter bore diameter design has 150,200,250,300mm can design any specification between 150-300mm according to actual needs; Maximum gauge is subjected to the drill capacity restriction, promptly is complementary with used drill capacity, generally is not more than 300mm.

Claims

1. automatic reducing borehole-enlarging drilling tool, it is characterized in that: form by preceding drill body, back drill body, cut knife rest, support knife rest, attaching nut, sliding sleeve, connecting pin, cottor pin, preceding drill body, back drill body, cut knife rest, support knife rest are formed quadric chain, cut knife rest, support knife rest are 120 degree three wings and distribute, drill body and back drill body before the attaching nut connects, connecting pin and cottor pin are fixed on sliding sleeve, cut knife rest and support knife rest on the forward and backward drill body, form this quadric chain; Support the preceding drill body control inclined-plane on the knife rest, limit the maximum opening angle of cut knife rest and support knife rest, realize the design counter bore diameter of drilling tool; And, design the borehole-enlarging drilling tool of serial counter bore diameter by designing the preceding drill body control inclined-plane of different angles;

When normally creeping into, under the rig thrust, drill body before back drill body inserts, locked support knife rest supports the locked again cut knife rest of knife rest, will support knife rest and cut knife rest and hold tightly on forward and backward drill body, realizes that minor diameter normally creeps into; After at the bottom of creeping into the hole, rig pulls out of hole, play under the force pulling effect at rig, back drill body supports knife rest and cut knife rest and is unlocked by pulling out 25mm-30mm in the preceding drill body, and cut knife rest and support knife rest open under force pulling, rotary centrifugal force and the acting in conjunction of borehole wall resistance, sliding sleeve drill body direction forward moves, quadric chain outwards opens, and realizes the trip-out reaming, once finishes the operation of large diameter borehole construction pore-creating.

2. according to the described automatic reducing borehole-enlarging drilling tool of claim 1, it is characterized in that: retreat when pulling out of hole, realize ream operation automatically, bore diameter becomes the 150-300mm large diameter borehole of design.

3. according to the described automatic reducing borehole-enlarging drilling tool of claim 1, it is characterized in that: use the sliding sleeve of band keyway,, realize opening of quadric chain, finish the ream operation when pulling out of hole by sliding over the slip on the drill body of back.

4. according to the described automatic reducing borehole-enlarging drilling tool of claim 1, it is characterized in that: the rotation of forward and backward drill body is transmitted by six sides in the preceding drill body and outer six sides of back drill body, and the rotation of sliding sleeve and back drill body comes transfer torque by key and sliding sleeve internal keyway on the drill body of back.