CN105134112B - The hole flushing method of coal mine gas extraction borehole - Google Patents

The hole flushing method of coal mine gas extraction borehole Download PDF

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CN105134112B
CN105134112B CN201510579809.9A CN201510579809A CN105134112B CN 105134112 B CN105134112 B CN 105134112B CN 201510579809 A CN201510579809 A CN 201510579809A CN 105134112 B CN105134112 B CN 105134112B
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nozzle
pressure
self
propulsive
bit
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CN105134112A (en
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葛兆龙
卢义玉
汤积仁
夏彬伟
宋晨鹏
周哲
邓凯
杨枫
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Chongqing University
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Chongqing University
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Abstract

The present invention discloses a kind of hole flushing method of coal mine gas extraction borehole, it uses the hole flushing device being made up of water tank, high-pressure pump, high pressure hard tube, high-pressure hose, self-feeding bit, base, capstan winch and propulsive mechanism, the mash gas pumping drilling for occurring to block, collapse to underground coal mine, the part that blocks, collapses is crushed using the rock breaking capacity of self-advancing type water jet, rinsed, come to drilling dredged, reaming;The tractive force provided using self-feeding bit makes the exceptionally straight advance of high-pressure hose;And there is certain rigidity, energy transmitting thrust characteristic using pitch tube, self-feeding bit is advanced in the larger context.Main function of the present invention be to underground coal mine block, collapse drilling dredged, reaming, to improve gas pumping efficiency.This method compared with the method for the prior art, with easy to operate, can hole flushing efficiency high the advantages of, be mainly suitable for using in the extraction borehole of dredge blockage during weak seam gas pumping.

Description

The hole flushing method of coal mine gas extraction borehole
Technical field
The invention belongs to coal production field, it is related to a kind of hole flushing method of coal mine gas extraction borehole, is adapted to Used during lower permeability seam gas pumping during the extraction borehole of dredge blockage.
Background technology
China's highly gassy mine quantity is big, and distribution is wide, and most of highly gassy mine is coal and gas outburst mine.With this Meanwhile, pit mining depth cumulative year after year, coal seam gas-bearing capacity further increases, and projecting coal bed quantity is in increase trend.Drilling Gas pre-drainage is to administer one of most common method of coal mine gas disaster, but projecting coal bed general soft, especially southwest, 93.14% colliery minable coal seam is all with the dangerous weak seam of coal and gas prominent.Because coal rock strength is low, gas After extraction borehole pore-forming, receive the influence of crustal stress, gas stress and mining stress field, weak seam borehole wall easily across Collapse, drill yielding.When drilling is collapsed, blocked, gas circulation is interrupted, easily causes scrapping for drilling, and shortening drilling makes With the life-span, extracting result is influenceed, Safety of Coal Mine Production is threatened.
The problems such as easily occurring collapse hole for weak seam, has scholar to propose the solutions such as drilling solid hole, anti-collapse hole, as in Disclosed in state patent document CN102226389A《The anti-collapse hole pipe network of coal mine drilling and anti-collapse hole method》It is public with CN103114810A Open《A kind of anti-collapse hole of coal bed drilling is with drilling lower sleeve device and boring method》, but the method proposed was being carried out There is problems with journey:Drill bit and drilling tool be often complicated after improvement, heaviness, and manufacturing cost is higher, is not suitable with underground coal mine Job site narrow space, causes drilling efficiency low;And can not still be fully solved the collapsing of drilling, blockage problem.And for coal What is largely existed in ore deposit collapses, blocks drilling, primarily now creeps into the method de-plugging of drainage holes again using mechanical drilling tool. CNI02312660A bulletins《Borehole cleaning drilling tool》A kind of mechanical borehole cleaning drilling tool simple in construction is devised, but uses mechanical drilling tool Not only cost is high for complement drilling, and has that rig device to hole is difficult, drilling efficiency is low, move back brill needs to waste after plenty of time, drilling The problems such as needing sealing of hole again.With reference to successful application of the water jet in weak seam is anti-reflection, it is thus proposed that utilize water jet hole flushing, As disclosed in CN103015898A《A kind of mining hydraulic power operation machine》Devise a kind of gas pumping hole waterpower working rig, the design Hole flushing is carried out to mash gas pumping drilling with high-pressure water jet, the more conventional mechanical drill of this method has higher efficiency, but Still suffer from problems with:The waterpower working rig build of design is huge, be difficult in adapt to the narrow and small working space in underground;The winding steel used Pipe hardness is big, fatiguability is damaged, and easily occurs bit freezing in progradation is forced in drilling process, bores inclined.
The content of the invention
Easily collapse, block the present invention be directed to weak seam mash gas pumping drilling, influence gas pumping efficiency, threaten colliery The problems such as safety in production, according to the actual job environment in colliery and the coal petrography volume property of drilling, propose to utilize self-advancing type high pressure Water jet and the active propulsion to power pipeline, collapse to coal mine gas, block the method that drilling carries out dredging de-plugging.Raising watt This extraction efficiency.
The present invention provides following technical scheme:
The hole flushing method of coal mine gas extraction borehole proposed by the present invention, using hard by water tank, high-pressure pump, high pressure The drilling hole flushing device that pipe, high-pressure hose, self-feeding bit, base, capstan winch and propulsive mechanism are constituted, step is as follows:
(1) according to the hole that collapses, the position of blocking drilling and angle, the bottom support frame of base is fixed, and adjust on base The length of propulsive mechanism support in the angle and guide rail of supporting leg and guide rail;
(2) and then by capstan winch and propulsive mechanism be fixed on base, and connect high pressure hard tube and high-pressure hose composition Power pipeline, and connect self-feeding bit;
(3) it is conveyed to the height being wrapped on capstan winch through piping and high pressure sealing water tail as the water under high pressure produced by high-pressure pump Hard tube is pressed, high pressure hard tube can be through propulsive mechanism before feeding drilling, and the propulsive force provided by propulsive mechanism makes high pressure Hard tube is fed forward along drilling;
(4) when high-pressure hose and self-feeding bit of the water under high pressure by high pressure hard tube front end, self-feeding bit produces high Pressure water jet is divided into preceding jet, middle jet and the part of rear jet three.Preceding jet carries out broken dredge to the rock for the part that blocks, collapses It is logical, and the effect with certain reaming;Middle jet has centralizing function to drill bit, can effectively prevent drill bit from boring inclined;Jet afterwards There is provided for the drilling of drill bit and make high-pressure hose exceptionally straight from entering power, whole power pipeline above high-pressure hose pulling force and push away below The conveying of long term distance can be realized by entering under the collective effect for the thrust that mechanism is provided by frictional force high pressure hard tube, so that real Now to the dredging of medium-length hole.
(5) high pressure hard tube and high-pressure hose are withdrawn by propulsive mechanism and capstan winch after hole flushing;
(6) gas pumping effect is evaluated after hole flushing, to what is not up to required, reuses hole flushing device and come and go several times To drilling dredged, reaming, to ensure to obtain preferable extracting result.
The self-feeding bit that this method is used include the center self-oscillation nozzle of bit body and bit body, side nozzle, in Portion's nozzle and posterior nozzle, bit body have front platform and internal cavities;The bit body front portion is spherical, before front end face is Portion's platform, is setting center self-oscillation nozzle on self-feeding bit axis in Platform center, center self-excitation is surrounded on platform Vibrating nozzles surrounding is evenly arranged side nozzle;The bit body rear end is openend, is used to connect high-pressure hose provided with internal thread; The internal cavities of bit body are the combination cavity of leading portion cone and back segment cylinder, and the taper of conical section is
The propulsive mechanism that this method is used includes frame, synchronous pulley, compresses belt wheel, special-shaped synchronous cog belt, band deceleration The air motor of machine, speed reducer output shaft, follower shaft, compress wheel shaft, it is compressor arm, spring, wing nut, conduit saddle mechanism, anti- Dust hood and corresponding link member.
A pair of synchronous pulleys are arranged in frame, and one is driving wheel, is connected with the speed reducer output shaft of air motor, separately One is to be connected between driven pulley, two belt wheels by special-shaped synchronous cog belt, and the outer surface of special-shaped synchronous cog belt has and high pressure The U-lag of hose outside diameter matching.
A pair of compression belt wheels are by compressing wheel shaft in frame, with synchronous pulley up and down just to coordinating, two holddown belts Connected, produced by the abundant contact of special-shaped synchronous cog belt and high pressure hard tube by another special-shaped synchronous cog belt between wheel Raw frictional force provides propulsive force, so as to realize the compression to high-pressure resin pipe;
One end, spring and the spring cup for compressing wheel shaft are enclosed on compressor arm, and wing nut is screwed into compressor arm upper end Tight against spring cup, lower spring end is pressed on compression wheel shaft, can make the spring-compressed on compressor arm by adjusting wing nut, real Now compress above and below belt wheel and adjust;
Conduit saddle mechanism is arranged on whole propulsion plant foremost, and it has regulation stock, and regulation stock lower end passes through axle Pin is arranged in frame, can carry out the rotation of different angles around pivot pin, and in frame centered on pivot pin in same radius Multiple adjustment holes are set, regulation stock provided with a regulation positioning hole, regulation positioning hole respectively it is corresponding with each adjustment hole simultaneously After being connected, the angular adjustment of regulation stock is realized, first order regulation is formed;The upper end of regulation stock is fixed with regulating bolt One " T " font guide rail, guide rail can be rotated by regulating bolt around regulation stock upper end, form two grades of regulations;Guide rail two ends are each A hole is opened so that guide wheel shaft passes through, is installed with reeded directive wheel on guide wheel shaft, is high pressure tree between two directive wheels The space that fat pipe passes through;Guide wheel shaft two ends are fixed by pad and split pin, and respectively covered at two ends an extension spring with Keep the balance of overall guide wheel shaft and directive wheel;
Capstan winch described in this method is used to wind pitch tube, and realizes to the automatic unwrapping wire of pitch tube progress and take-up;Capstan winch It is each attached to propulsive mechanism on base, by each part of adjusting base device can be made to correspond to diverse location and the brill of angle Hole.
The described hole flushing method of the present invention has the characteristics that:
1. there are higher efficiency of breaking rock and pace, hole flushing efficiency high when self-feeding bit is crept into soft seam;From Enter centralizing function of the middle nozzle to drill bit of formula drill bit, can effectively prevent and treat drill bit and bore inclined;Self-feeding bit carries for high-pressure hose Supplied certain pulling force, made high-pressure hose exceptionally straight, it is to avoid high-pressure hose because bending and caused by drill bit bore inclined;
2. high-pressure hose has preferable pliability, when high-pressure resin hard tube is in progradation, it is to avoid because of pitch tube Situation that is too hard and blocking in the borehole occurs;
3. high-pressure resin hard tube has appropriate hardness, can bend and wind and bear, transmit certain thrust, compensate for Self-feeding bit limits the defect of hole flushing depth because of tractive force deficiency, greatly increases hole flushing depth;Resin bore is larger, Water under high pressure can be made to pass through with the less pressure loss, the hydraulic pressure required for self-feeding bit broken rock drilling is met;
4. this hole flushing method can carry out effective reaming while hole flushing to drilling, improve gas pumping effect;
When 5. carrying out hole flushing to the drilling that blocks, collapse using this hole flushing method, exist when device to hole small inclined Difference, does not result in yet and to be unable to the phenomenon of hole flushing and occur, it is to avoid the problem of machine drilling is unable to hole flushing because being difficult to device to hole;
When 6. carrying out hole flushing to the drilling that blocks, collapse using this hole flushing method because pitch tube, high-pressure hose and from The diameter for entering formula drill bit is smaller than the diameter of the gas pumping pipe in drainage holes, therefore, it can directly from drainage tube enter Hole flushing, it is to avoid sealing of hole again;
7. compared to mechanical drilling tool hole flushing, during using this hole flushing method hole flushing, the step such as installation and withdrawal in the absence of drilling rod, Greatly improve hole flushing efficiency.
This method compared with the method for the prior art, with easy to operate, quickly can be realized effectively to the drilling that blocks, collapses The advantage on the mesh ground of hole flushing is carried out, is mainly suitable for making in the extraction borehole of dredge blockage during lower permeability seam gas pumping With.
Brief description of the drawings
Fig. 1 is the structural representation of hole flushing device;
Fig. 2 is the left view of the self-feeding bit of hole flushing device;
Fig. 3 is A-A profiles of self-feeding bit;
Fig. 4 is B-B profiles of self-feeding bit;
Fig. 5 is the enlarged drawing of the center self-oscillation nozzle section of self-feeding bit;
Fig. 6 is the schematic diagram of self-feeding bit side nozzle drift angle and subtended angle;
Fig. 7 is the front view of propulsion plant (without dust cover);
Fig. 8 is A-A profiles of propulsion plant;
Fig. 9 is B-B profiles of propulsion plant;
Figure 10 and Figure 11 are the front elevation and E-E profiles of propulsion plant conduit saddle mechanism.
Figure 12 a and Figure 12 b are the front view and top view of hole flushing device pedestal;
Figure 13 a and Figure 13 b are the top views of propulsive mechanism and bottom support frame on hole flushing device pedestal;
Figure 14 is the structural representation of hole flushing device capstan winch;
Figure 14 a are Figure 14 A-A profiles.
Drawing reference numeral explanation:
1-water tank, 2-high-pressure pump, 3-capstan winch, 4-high pressure hard tube, 5-propulsive mechanism, 6-base, 7-high pressure is soft Pipe, 8-self-feeding bit;
5.1-frame, 5.2-abnormal shape synchronous cog belt, 5.3-synchronous pulley, 5.4-sunk screw, 5.5-shaft end gear Plate, 5.6-compress wheel shaft, 5.7-compression belt wheel, 5.8-compressor arm, 5.9-spring, 5.10-spring cup, 5.11-butterfly Nut, 5.12-conduit saddle mechanism, 5.13-follower shaft, 5.14-round nut, 5.15-bearing pin (including split pin), 5.16- Plain cushion, 5.17-bolt and and its nut, 5.18-speed reducer output shaft, the 5.19-air motor with reductor, 5.20- Fillister head screw, 5.21-dust cover, 5.22-guide rail, 5.23-guide wheel shaft, 5.24-extension spring, 5.25-nylon guide To wheel, 5.26-regulation stock, 5.27-regulation positioning hole;
6.1-bottom support frame, 6.2-guide rail, 6.3-supporting leg, 6.4-fixed plate, 6.5-additional body, 6.6- Propulsive mechanism support;
8.1-front platform, 8.2-self-oscillation nozzle, 8.3-side nozzle, 8.4-middle part nozzle, the spray of 8.5-rear portion Mouth, 8.6-internal thread, 8.7-internal cavities, 8.8-upstream nozzle, 8.9-the self-excited oscillation cavity, 8.10-downstream nozzle.
3.1-manual wire-arranging mechanism, 3.2-high pressure sealing water tail, 3.3-spoke, 3.4-capstan winch baffle plate, 3.5-capstan winch Central shaft, the 3.6-air motor with reductor.
Embodiment
The method of the invention is described further below in conjunction with the accompanying drawings.
Main function of the present invention be to underground coal mine block, collapse drilling dredged, reaming, with improve gas pumping effect Rate.Coal mine gas extraction borehole hole flushing method and technology principle of the present invention is:High-pressure resin pipe, high-pressure hose, from Enter formula drill bit and high-pressure water shot stream generation apparatus, pitch tube winding are used cooperatively with pushing meanss during hole flushing.To coal The mash gas pumping drilling for blocking, collapsing occurs under mine, the part that blocks, collapses is entered using the rock breaking capacity of self-advancing type water jet Row is broken, rinse, to be dredged to drilling, reaming;Before the tractive force provided using self-feeding bit makes high-pressure hose exceptionally straight Enter;And there is certain rigidity, energy transmitting thrust characteristic using pitch tube, before enabling self-feeding bit in the larger context Enter, and high-pressure hose then compensate for the defect caused by pitch tube hardness is too big.Meanwhile, high-pressure hose has preferably flexible Property, it is to avoid blocked in the borehole because pitch tube is too hard.
As shown in figure 1, this method is used by water tank (1), high-pressure pump (2), high pressure hard tube (4), high-pressure hose (7), entered certainly The drilling hole flushing device that formula drill bit (8), base (6), capstan winch (3) and propulsive mechanism (5) are constituted is dredged to the part that blocks, collapses Logical, reaming.The water outlet connection high-pressure pump (2) of water tank, high-pressure pump is connected by high-voltage tube with capstan winch (3), and passes through high pressure sealing Water under high pressure is conveyed to the high pressure hard tube (4) being wrapped on capstan winch (3) by water tail, and high pressure hard tube (4) is passed through before feeding drilling Propulsive mechanism (5), the propulsive force provided by propulsive mechanism makes high pressure hard tube be fed forward along drilling, high pressure hard tube (4) Front end is sequentially connected high-pressure hose (7) and self-feeding bit (8), and self-feeding bit (8) is produced from into thrust.
Hole flushing step is as follows:
(1) according to the hole that collapses, the position of blocking drilling and angle, the bottom support frame of base (6) is fixed, and adjust base The length of propulsive mechanism support in the angle and guide rail of upper supporting leg and guide rail.
(2) and then by capstan winch (3) and propulsive mechanism (5) it is fixed on base, and connects high pressure hard tube (4) and high pressure is soft (7) power pipeline is managed, and connects self-feeding bit (8).
(3) it is conveyed to the height being wrapped on capstan winch through piping and high pressure sealing water tail as the water under high pressure produced by high-pressure pump Hard tube is pressed, high pressure hard tube can be through propulsive mechanism before feeding drilling, and the propulsive force provided by propulsive mechanism makes high pressure Hard tube is fed forward along drilling.
(4) when high-pressure hose and self-feeding bit of the water under high pressure by high pressure hard tube front end, self-feeding bit (8) is produced High-pressure water jet is divided into three parts:Preceding jet, middle jet and rear jet.Preceding jet is broken to the rock for the part that blocks, collapses Broken dredging, and the effect with certain reaming;Middle jet has centralizing function to drill bit, can effectively prevent drill bit from boring inclined;Afterwards Jet provides for the drilling of drill bit makes high-pressure hose exceptionally straight from entering power, whole power pipeline above high-pressure hose pulling force and after The conveying of long term distance can be realized under the collective effect for the thrust that face propulsive mechanism is provided by frictional force high pressure hard tube, from And realize the dredging to medium-length hole.
(5) high pressure hard tube and high-pressure hose are withdrawn by propulsive mechanism and capstan winch after hole flushing.
(6) gas pumping effect is evaluated after hole flushing, to what is not up to required, reuses hole flushing device and come and go several times To drilling dredged, reaming, to ensure to obtain preferable extracting result.
The power pipeline of the present apparatus is high pressure hard tube (4) and partial high-pressure hose (7), and high pressure hard tube (4) uses high pressure Pitch tube, high-pressure resin pipe can be wrapped on the capstan winch of certain diameter (3), with appropriate hardness, can be bent and be wound and hold By, the certain thrust of transmission, and resin bore is larger, and water under high pressure can be made to pass through with the less pressure loss, its front end with High-pressure hose (7) with self-feeding bit is connected.High-pressure hose has preferable pliability while can resist high pressure. In the case of the tractive force that self-advancing type flow jet flow drill is provided, high-pressure hose is in exceptionally straight state, it is to avoid bored caused by high-pressure hose is bent The situation that head is stuck in hole occurs.Therefore, the power that whole pipeline advances is above " pulling force " of high-pressure hose (7) and pushes away below Enter the collective effect power of " thrust " that mechanism (5) is provided.Such progression hole flushing efficiency high, and unlike mechanical hole flushing Such easy bit freezing.
As shown in Figures 2 to 6, this method employs the self-feeding bit (8) of unique structure, and it includes bit body and drill bit Center self-oscillation nozzle (8.2), side nozzle (8.3), middle part nozzle (8.4) and the posterior nozzle (8.5) of body.Bit body has Front platform (8.1) and internal cavities (8.7).The bit body rear end is openend, is used to connect height provided with internal thread (8.6) Press flexible pipe.The internal cavities (8.7) of bit body are the combination cavity of leading portion cone and back segment cylinder, the taper of conical section For
Self-feeding bit (8) front portion is spherical, and front end is a platform (8.1), and Platform center sets center self-oscillation to spray Mouth (8.2), its surrounding is evenly arranged the side nozzle (8.3) with certain subtended angle α and drift angle β, as shown in figure 12, to subtended angle α and Drift angle β definition is:Side nozzle starting point c will be crossed and the straight line cc ' parallel with drill axis oo ' is defined as straight line one, straight line one Plane one is defined as with plane oo ' d ' d determined by drill axis;It is baseline with straight line one, first to side jet in plane one Way out deflects certain angle to the direction away from drill axis, and this angle initialization is subtended angle α, now determines nozzle-axis ce Justice is straight line two;It is rotary shaft with straight line one again by straight line two using side nozzle starting point as origin, rotates certain cone angle, gained Nozzle-axis cf is defined as the actual axis of straight line three, as front nozzle, now by straight line two and straight line three in self-feeding bit The angle of projection e c ' and f c ' on cross section is set as drift angle β.All side nozzles are all according to said method evenly arranged, and deflection Angle and direction it is consistent.The middle part nozzle in cross-section with certain deviation angle θ is evenly distributed with the middle part of drill bit (8.4), as shown in figure 9, cross section referred to the axis and the plane vertical with drill axis of middle part nozzle, deviation angle θ refers to The axis of middle part nozzle and the angle of radial direction radius.Drill bit rear end is openend, and inside is used to connect height provided with internal thread (8.6) Flexible pipe is pressed, it is in certain cone angle Φ posterior nozzle (8.5) that it is evenly arranged with axis above, as shown in Fig. 2 cone angle Φ refers to The axis of posterior nozzle and the angle of drill axis.
Visible with reference to Fig. 2 and Fig. 4, the number of side nozzle (8.3) is 3-4, and nozzle diameter is 0.5mm-1.0mm, point Cloth radius R1 is 1.0mm-10.0mm, and subtended angle α is between 15 ° -30 °, preferably 25 °, and drift angle β is optimal between 60 ° -90 ° For 360 °/n (n refers to side nozzle number).Distribution radius R1 refers to side injection stream export center to the distance of drill axis.
Visible with reference to Fig. 3, the front-end platform (8.1) of drill bit reduces the overall dimensions of drill bit, is easy to get out on platform Center self-oscillation nozzle (8.2) and side nozzle (8.3), its radius R2 are 10.5mm -4.0mm.The number of posterior nozzle (8.5) Mesh is 6-8, and nozzle diameter is 0.5mm-1.5mm, and axial cone angle Φ is between 10 °-30 °, and optimal is 25 °.In bit body Portion is the combination cavity of cone and cylinder, combines the cone angle of cavity conical section between 20 ° -45 °, the cone angleSelection Principle is to make the local losses of jet minimum, easy to process.
Visible with reference to Fig. 4, the number of middle part nozzle (8.4) is 3-4, and nozzle diameter is 0.5mm-1.0mm, the deviation angle θ is between 30 ° -45 °.The main function of middle part nozzle is centralizing function, and broken rock repaiies hole and acts on weaker, while its jet is anti- The torque that impulse force is produced can tighten drill bit.It is thus impossible to too greatly can not be too small,
Visible with reference to Fig. 5, center self-oscillation nozzle (8.2) is arranged on self-feeding bit axis, is sprayed successively by upstream Mouth (8.8), the self-excited oscillation cavity (8.9) and downstream nozzle (8.10) composition.Self-oscillation cavity length L is generally upstream nozzle diameter 2.3~3.3 times of d1, downstream nozzle diameter d2 is generally 1.2~1.3 times of upstream nozzle diameter d1.The self-excited oscillation cavity (8.9) Main body be cylindrical cavity, 18 times of its a diameter of upstream nozzle diameter d1;The vertical section of cavity is symmetrical above and below parallel four Side shape, cavity upstream and downstream nozzle impingement wall is taper surface, and upstream nozzle impact walls are convex to upstream, and downstream nozzle impact walls are concaved towards Downstream.
The nozzle of self-propelled high pressure water jet drill bit all directions has the effect that:
1. the jet sprayed through central nozzle has large energy, and deeper brill is formed during directly impact rib Hole;
2. the jet and axial direction that side nozzle is produced are angled so that the jet sprayed at a high speed has higher cut To speed and the higher shearing stress of generation, strike can be played to front rib and effect is degraded, is drill bit so as to expand drilling Advance with high-pressure hose provides passage;
3. the high-speed jet that nozzle is produced in passing through is sprayed perpendicular to the wall of a borehole, in the wall of a borehole scour process, makes brill Head will not be close to hole wall and be crept into, and prevent drill bit from boring inclined.Meanwhile, the jet vertically sprayed can be by the crack of hole wall, crack Fully " open ", obtain more preferable extracting result;
4. high-speed jet is sprayed through rear nozzle opposite with drill bit advancing direction and there should be certain angle with axial direction Degree, meanwhile, the injection flow of rear nozzle should be bigger than the flow of front nozzle.The main function of rear nozzle includes:There is provided and push away for drill bit Power, traction high-pressure hose advance, exclude drilling cuttings and reaming.
One of another key point of the present invention is to employ propulsive mechanism (5), and referring to Fig. 7 to Figure 11, it includes frame (5.1), synchronous pulley (5.3), compression belt wheel (5.7), special-shaped synchronous cog belt (5.2), the air motor with reductor (5.19), speed reducer output shaft (5.18), follower shaft (5.13), compression wheel shaft (5.6), threaded compressor arm (5.8), bullet Spring (5.9), wing nut (5.11), conduit saddle mechanism (5.12), dust cover (5.21) and corresponding link member.
Referring to Fig. 7, Fig. 8 and Fig. 9, both sides are respectively symmetrical arranged a pair of belt wheels above and below high-pressure hose, and downside is drive pulley (5.3), including driving pulley and driven pulley, upside is installed in frame (5.1) to compress belt wheel (5.7).Driving pulley (5.3) it is connected by speed reducer output shaft (5.18) with the air motor (5.19) with reductor, driving pulley and driven pulley (5.3) the special-shaped synchronous cog belt (5.2) with U-shaped groove is cased between, when air motor (5.19) drives driving pulley (5.3) During rotation, driven pulley (5.3) will together be rotated in the presence of special-shaped synchronous cog belt (5.2).Air motor used (5.19) there is explosion-proof performance, use piston type pneumatic motor more, rotating can be realized, can also carry out stepless time adjustment, rotating speed It is relatively slow, but the moment of torsion provided is big, and rotating speed can be adjusted by adjusting air inflow, so as to be crept into from not in the same time different Speed matches.
The compressor arm (5.8) for compressing belt wheel (5.7) is that a top is that cylinder bottom is cubical rod member, and top is justified Post is threaded, and its size and wing nut (5.11) are supporting, and the cross section of lower cube is square, and its size is with compressing Wheel shaft (5.6) is supporting.
The left side for compressing wheel shaft (5.6) is cylindrical drive shaft, and the right is hollow cube, and its size can be such that it is just enclosed on On compressor arm (5.8) lower cube, so as to realize moving up and down for contact roller.
Whole compressor arm (5.8) is welded in the frame of propulsion plant (5.1).Compress and pressure is installed on wheel shaft (5.6) The special-shaped synchronous cog belt (5.2) of identical is cased between bearing up pulley (5.7), two contact rollers (5.7).By tightening on compressor arm (5.8) Wing nut (5.11) come holddown spring lid (5.10) and spring (5.9), so as to promote moving down for contact roller (5.7), complete To the compression of high-pressure hose, the offer of frictional force is realized.This compression mode has certain elasticity, can under bad environment work Make.
As shown in Figure 10 and Figure 11, propulsion plant front end is a conduit saddle mechanism (5.12), and it is by regulation stock (5.26), Buddhist nun Imperial directive wheel (5.25), guide rail (5.22), extension spring (5.24) and other link members composition.Adjust stock (5.26) lower end Be arranged on by pivot pin in frame (5.1), can carry out the rotation of different angles around pivot pin, and in frame centered on pivot pin Multiple adjustment holes are set in same radius, regulation stock provided with a regulation positioning hole (5.27), regulation positioning hole respectively with Each adjustment hole correspondence and the angle that a certain needs are fixed on by screw bolt and nut, realize the angular adjustment of regulation stock, shape Into first order regulation, this is first order regulation.The upper end of regulation stock (5.26) secures a guide rail (5.22) with bolt, leads Rail (5.22) is " T " font, and a hole is respectively opened so that guide wheel shaft (5.23) passes through in two ends;With reeded nylon directive wheel (5.25) space that string passes through between one side of guide wheel shaft (5.23), two directive wheels (5.25) for high-pressure resin pipe;It is oriented to Wheel shaft (5.23) two ends are fixed by pad (5.16) and split pin (5.15), and respectively covered at two ends an extension spring (5.24) to keep the balance of overall guide wheel shaft (5.23) and directive wheel (5.25);The whole front end for adjusting stock (5.26) can To make it be rotated with guide rail (5.22) around bolt by regulating bolt, it is easy in the smooth feeding hole of high-voltage tube, so as to keep away Exempt from high-voltage tube port wall turn it is too urgent cause resistance excessive, this be the second level regulation.Whole deposit mechanism is adjusted by the first order Section regulation stock (5.26) and the second level regulation guide rail (5.22) come realize by high-pressure resin pipe smoothly send into diverse location with In the drilling at inclination angle.
In addition, whole propulsion plant is protected with aluminium alloy sheet dust cover (5.21), the entrance of dust can be effectively reduced, Improve the propulsion effect and service life of mechanism, it is ensured that the safety of operating personnel.
Referring to Figure 12 a, Figure 12 b, Figure 13 a and Figure 13 b, the base (6) of the present apparatus is by bottom support frame (6.1), supporting leg (6.3), guide rail (6.2), propulsive mechanism support (6.6), additional body (6.5) and fixed plate (6.4) etc. are constituted.
Bottom support frame (6.1) surrounding is hinged with folding additional body (6.5), when it is extended, increases base Bottom out area, so as to ensure the stability of whole base.The lower end of supporting leg (6.3) and guide rail (6.2) is hinged on bottom On support frame (6.1), installed on guide rail (6.2) on propulsive mechanism support (6.6), propulsive mechanism support (6.6) along its length A series of adjustment holes are distributed with, are connected by adjustment hole with guide rail (6.2), realize that propulsive mechanism support (6.6) is stretched on guide rail The regulation of contracting length;The upper end of supporting leg (6.3) is connected using adjusting screw with the adjustment hole of propulsive mechanism support (6.6), from And adjust the angle of guide rail (6.2);Capstan winch (3) and propulsive mechanism (5) are separately fixed at base by fixed plate (6.4) respectively On bottom support frame (6.1) and propulsive mechanism support (6.6), position can adjust, angle and the propulsive mechanism branch of its middle guide The regulation of the length of frame is significantly to adjust, and is drilling for different height and different angles and adjusts;And design and fix Plate is the regulation of small range, is on the one hand easily installed capstan winch and propulsive mechanism, is on the other hand conducive to being fixed on suitable installation Position, makes it mutually coordinate with complete equipment.Whole understructure is simple, easy to adjust, it is adaptable in the sky that underground coal mine is narrow The interior drilling to diverse location and angle is adjusted.
As shown in Figure 14 and Figure 14 a, the capstan winch (3) of the present apparatus is by capstan winch baffle plate (3.4), spoke (3.3), high pressure sealing water The composition such as tail (3.2), capstan winch central shaft (3.5), the air motor (3.6) with reductor and manual wire-arranging mechanism (3.1).Capstan winch Baffle plate (3.4) and spoke (3.3) constitute the winding disc of high pressure hard tube (4), and its rotary shaft is capstan winch central shaft (3.5);In One end of heart axle (3.5) is high pressure sealing water tail (3.2), the pressure duct for connecting high-pressure pump (2);Central shaft (3.5) is another One end is the air motor (3.6) with reductor, drives winding disc to rotate, realizes unwrapping wire and the take-up of high pressure hard tube (4);Pass through The air inflow of regulation motor (3.6) can make the fltting speed synchronization of the payingoff speed and propulsive mechanism (5) of capstan winch (3), and can Its reversion is set to carry out take-up;It is a manual wire-arranging mechanism (3.1) in the front end of capstan winch (3), manual winding displacement can be carried out to capstan winch.
Schematical embodiment of the invention is the foregoing is only, and is not used to determine the scope of the present invention, in this hair On the basis of bright disclosed technology and scheme, those skilled in the art can according to disclosed in this patent technology contents, it is not necessary to Performing creative labour can just make some modifications and variations to some of which technical characteristic, and these modifications and variations are at this In the protection domain of invention.

Claims (6)

1. the hole flushing method of coal mine gas extraction borehole, it is characterised in that:Methods described is used by water tank(1), high-pressure pump (2), high pressure hard tube(4), high-pressure hose(7), self-feeding bit(8), base(6), capstan winch(3)And propulsive mechanism(5)Composition Hole flushing device, step is as follows:
(1)According to the hole that collapses, the position drilled and angle are blocked, base is fixed(6)Bottom support frame, and adjust on base prop up Support leg and guide rail(6.2)Angle and guide rail(6.2)The length of upper propulsive mechanism support;
(2)Then by capstan winch(3)And propulsive mechanism(5)It is fixed on base(6)On, and connect high pressure hard tube(4)It is soft with high pressure Pipe(7)The power pipeline of composition, connects self-feeding bit(8);
(3)By high-pressure pump(2)Produced water under high pressure is conveyed to the height being wrapped on capstan winch through piping and high pressure sealing water tail Hard tube is pressed, high pressure hard tube passes through propulsive mechanism before feeding drilling, and the propulsive force provided by propulsive mechanism makes high pressure hard Pipe is fed forward along drilling;
(4)When high-pressure hose and self-feeding bit of the water under high pressure by high pressure hard tube front end, self-feeding bit(8)Produce high pressure Water jet is divided into preceding jet, middle jet and the part of rear jet three;Preceding jet carries out broken dredge to the rock for the part that blocks, collapses It is logical, and the effect with certain reaming;Middle jet has centralizing function to drill bit, prevents drill bit from boring inclined;Jet is drill bit afterwards Drilling, which is provided from entering power, makes high-pressure hose exceptionally straight, pulling force and below propulsive mechanism pair of the whole power pipeline in above high-pressure hose It can realize that long term distance is conveyed under the collective effect for the thrust that high pressure hard tube is provided by frictional force, so as to realize to medium-length hole Dredging;
(5)High pressure hard tube and high-pressure hose are withdrawn by propulsive mechanism and capstan winch after hole flushing;
(6)Gas pumping effect is evaluated after hole flushing, to what is not up to required, hole flushing device is reused and comes and goes several times to boring Hole is dredged, reaming, to ensure to obtain preferable extracting result;
The self-feeding bit (8) includes the center self-oscillation nozzle on bit body and bit body(8.2), side nozzle (8.3), Middle part nozzle (8.4) and posterior nozzle (8.5);The bit body front portion is spherical, and front end face is front platform (8.1), flat Platform center is setting center self-oscillation nozzle on self-feeding bit axis(8.2), sprayed on platform around center self-oscillation Mouth(8.2)Surrounding is evenly arranged side nozzle (8.3);The bit body rear end is openend, is used to connect provided with internal thread (8.6) High-pressure hose;Bit body has internal cavities(8.7), it is the combination cavity of leading portion cone and back segment cylinder, cone The taper of section is φ;
The propulsive mechanism (5) includes frame(5.1), synchronous pulley(5.3), compress belt wheel(5.7), special-shaped synchronous cog belt (5.2), the air motor with reductor(5.19), speed reducer output shaft(5.18), follower shaft(5.13), compress wheel shaft (5.6), compressor arm(5.8), spring(5.9), wing nut(5.11), conduit saddle mechanism(5.12)And corresponding link member;
A pair of synchronous pulleys(5.3)Installed in frame(5.1)On, one is driving wheel, with air motor(5.19)Reductor Output shaft(5.18) connect, another is to pass through special-shaped synchronous cog belt between driven pulley, two belt wheels(5.2)Connection, it is special-shaped same There is the U-lag matched with high-pressure hose external diameter the outer surface of step cog belt;
A pair of compression belt wheels(5.7)By compressing wheel shaft(5.6)Installed in frame(5.1)On, with synchronous pulley(5.3)Up and down just To coordinating, two compress belt wheel(5.7)Between pass through another special-shaped synchronous cog belt(5.2)Connection, it is synchronizing jugged by abnormal shape Band(5.2)With high pressure hard tube(4)Abundant contact produced by frictional force propulsive force is provided, so as to realize to high pressure hard tube Compress;
Compress wheel shaft(5.6)One end, spring(5.9)And spring cup(5.10)It is enclosed on compressor arm(5.8)On, wing nut It is screwed into compressor arm(5.8)Upper end is tight against spring cup(5.10), spring(5.9)Lower end is pressed in compression wheel shaft(5.6)On, by adjusting Save wing nut(5.11)Compressor arm can be made(5.8)On spring(5.9)Compression, realizes and compresses belt wheel(5.7)Adjust up and down;
Conduit saddle mechanism(5.12)Installed in whole propulsion plant foremost, it has regulation stock(5.26), adjust stock (5.26)Lower end passes through pivot pin(5.15)Installed in frame(5.1)On, the rotation of different angles can be carried out around pivot pin, and in frame On multiple adjustment holes are set centered on pivot pin in same radius, regulation stock is provided with a regulation positioning hole(5.27), Regulation positioning hole is corresponding with each adjustment hole respectively and after being connected, and realizes the angular adjustment of regulation stock, the formation first order Regulation;Adjust stock(5.26)Upper end " T " font guide rail is fixed with regulating bolt(5.22), " T " font guide rail (5.22)Can be around regulation stock by regulating bolt(5.26)Upper end is rotated, and forms two grades of regulations;" T " font guide rail(5.22)Two A hole is respectively opened so as to guide wheel shaft in end(5.23)Pass through, with reeded directive wheel(5.25)Installed in guide wheel shaft(5.23) On, two directive wheels(5.25)Between the space that passes through for high pressure hard tube;Guide wheel shaft(5.23)Two ends pass through pad(5.16)With Split pin(5.15)It is fixed, and respectively covered at two ends an extension spring(5.24)To keep overall guide wheel shaft(5.23)With lead To wheel(5.25)Balance;
Capstan winch(3)Wind high pressure hard tube(4), and realize to the automatic unwrapping wire of high pressure hard tube progress and take-up;
Capstan winch(3)And propulsive mechanism(5)It is each attached to base(6)On, by each part of adjusting base device can be made to correspond to not With the drilling of position and angle.
2. the hole flushing method of coal mine gas extraction borehole according to claim 1, it is characterised in that:The base (6)By bottom support frame(6.1), supporting leg(6.3), guide rail(6.2), propulsive mechanism support(6.6), additional body(6.5)With Fixed plate(6.4)Composition;Bottom support frame(6.1)Surrounding is hinged with folding additional body(6.5), keep whole base Stability;Supporting leg(6.3)And guide rail(6.2)Lower end be hinged on bottom support frame(6.1)On, guide rail(6.2)It is upper to install Propulsive mechanism support(6.6), propulsive mechanism support(6.6)On a series of adjustment holes are distributed with along its length, pass through adjustment hole With guide rail(6.2)Connection, realizes propulsive mechanism support(6.6)The regulation for length of being stretched on guide rail;Supporting leg(6.3)Upper end Using adjusting screw and propulsive mechanism support(6.6)Adjustment hole connection, so as to adjust guide rail(6.2)Angle;Capstan winch(3)With Propulsive mechanism(5)Pass through fixed plate respectively(6.4)It is separately fixed at the bottom support frame of base(9)With propulsive mechanism support (6.6)On, position can adjust.
3. the hole flushing method of coal mine gas extraction borehole according to claim 1, it is characterised in that:The self-advancing type The platform of drill bit (8)(8.1)Radius R2 is 10.5mm -4.0mm, side nozzle(8.3)Number be 3-4, side nozzle diameter It is 1.0mm-10.0mm, the side nozzle of the self-feeding bit around the distribution radius R1 of Platform center for 0.5mm -1.0mm (8.3) there is subtended angle α and drift angle β;Subtended angle α is between 15 ° -30 °, and drift angle β is between 60 ° -90 °;Side nozzle setting is: Determine to be some side nozzle starting point away from drill axis 1.0mm-10.0mm distances in front platform (8.1), by side nozzle starting point And the straight line parallel with drill axis is defined as straight line one, plane definition determined by straight line one and drill axis is plane one; It is baseline with straight line one, first deflects certain angle to side jet exit direction to the direction away from drill axis in plane one, This angle initialization is subtended angle α;Side nozzle-axis is now defined as straight line two;Again by straight line two using side nozzle starting point as origin, It is rotary shaft with straight line one, rotates certain cone angle, the side nozzle-axis of gained is defined as the actual axle of straight line three, as side nozzle Line, the angle for now projecting straight line two and straight line three on self-feeding bit cross section is set as drift angle β;All side nozzles are all According to said method it is evenly arranged, and the angle and direction of deflection is consistent.
4. the hole flushing method of coal mine gas extraction borehole according to claim 1, it is characterised in that:The self-advancing type The middle part nozzle (8.4) in cross-section with deviation angle θ, the middle part spray are evenly distributed with the middle part of the bit body of drill bit (8) Mouth(8.4)Number be 3-4, middle part nozzle diameter be 0.5mm-1.0mm, deviation angle θ is between 30 °-45 °, the deviation angle θ refers to the angle of the axis and radial direction radius of middle part nozzle, and cross section referred to the axis of middle part nozzle and hung down with drill axis Straight plane.
5. the hole flushing method of coal mine gas extraction borehole according to claim 1, it is characterised in that:The self-advancing type The posterior nozzle (8.5) in cone angle Φ with drill bit body axis, rear portion spray are evenly arranged on the bit body rear end side wall of drill bit (8) The number of mouth is 6-8, a diameter of 0.5mm-1.5mm of posterior nozzle, and axial cone angle Φ is between 10 °-30 °, axial cone angle Φ refers to the axis of posterior nozzle and the angle of drill axis.
6. the hole flushing method of coal mine gas extraction borehole according to claim 1, it is characterised in that:It is described from exciting Swing nozzle(8.2)Successively by upstream nozzle(8.8), the self-excited oscillation cavity(8.9)And downstream nozzle(8.10)Composition;The self-excited oscillation cavity Length L is 2.3 ~ 3.3 times of upstream nozzle diameter d1, and downstream nozzle diameter d2 is 1.2 ~ 1.3 times of upstream nozzle diameter d1;From Induced Oscillation chamber(8.9)Main body be cylindrical cavity, 18 times of its a diameter of upstream nozzle diameter d1;Above and below the vertical section of cavity is Symmetrical parallelogram, cavity upstream and downstream nozzle impingement wall is taper surface, and upstream nozzle impact walls are convex to upstream, downstream spray Mouth impact walls concave towards downstream.
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