CN206220855U - Underground coal mine automatic drilling device of turning - Google Patents
Underground coal mine automatic drilling device of turning Download PDFInfo
- Publication number
- CN206220855U CN206220855U CN201621325354.4U CN201621325354U CN206220855U CN 206220855 U CN206220855 U CN 206220855U CN 201621325354 U CN201621325354 U CN 201621325354U CN 206220855 U CN206220855 U CN 206220855U
- Authority
- CN
- China
- Prior art keywords
- continuous pipe
- automatic drilling
- coal mine
- pillar
- turning
- 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.)
- Expired - Fee Related
Links
Landscapes
- Earth Drilling (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model provides a kind of underground coal mine automatic drilling device of turning.The underground coal mine automatic drilling device of turning includes：Pressurization pump truck；Continuous pipe, the entrance that continuous pipe has entrance and exit, the continuous pipe connects the pressurization pump truck；The outlet of the continuous pipe is used to extend into raw coal operation supporting surface；Coil device, connects the continuous pipe；Pillar, is set in outside the continuous pipe and is pushed against on raw coal operation supporting surface and be connected to the downstream of the coil device；The pillar is cross pipe, and the pillar has the axial passage of the conveying continuous pipe and the side path of the row's of returning coal dust；Rotary nozzle, is connected to the exit of the continuous pipe；Coal dust returns comb line, is connected on the side path of the pillar；Gas is returned and flows back to receipts detection means, is connected the coal dust and is returned comb line.The utility model improves gas pumping effect, and reduces cost ensures safety.
Description
Technical field
The utility model is related to underground coal mine automatic drilling field, and in particular to a kind of underground coal mine automatic drilling device of turning,
The weak seam for easily accidents such as collapse hole/top brill/bit freezing occur particularly when drilling construction is carried out is drilled.
Background technology
Some coal mine mash gas assign there are low pressure, hypotonic and low saturation " three is low " feature, to coal mining and watt
This gas is utilized and brings very big difficulty.Weak seam is also widely present among these, more be increased exploitation and is utilized difficulty.At present,
More than the mash gas extraction of underground by the way of negative pressure extraction after coal mine drilling machine machine drilling, drilling construction easily goes out in weak seam
The accidents such as existing collapse hole/top brill/bit freezing, cause cost to increase, and extraction inefficiency, safety problem is protruded, and is that gas pumping covers entirely
It is badly in need of the technical barrier for solving in lid engineering.
In sum, there is problems with the prior art：Drilled in weak seam and collapse hole/top brill/card easily occur
The accidents such as brill, safety problem is protruded.
Utility model content
The utility model provides a kind of underground coal mine automatic drilling device of turning, occurs to solve to be drilled in weak seam easily
The problem of the accidents such as collapse hole/top brill/bit freezing.
Therefore, the utility model proposes a kind of underground coal mine automatic drilling device of turning, being arranged on the tunnel of underground coal mine
In, the underground coal mine automatic drilling device of turning includes：
Pressurization pump truck；
Continuous pipe, the entrance that continuous pipe has entrance and exit, the continuous pipe connects the pressurization pump truck；It is described continuous
The outlet of pipe is used to extend into raw coal operation supporting surface；
Coil device, connects the continuous pipe；
Pillar, is set in outside the continuous pipe and is pushed against on raw coal operation supporting surface and be connected to the coil device
Downstream；The pillar is cross pipe, and the pillar has the axial passage of the conveying continuous pipe lateral with the row's of returning coal dust
Passage；
Rotary nozzle, is connected to the exit of the continuous pipe；
Coal dust returns comb line, is connected on the side path of the pillar；
Gas is returned and flows back to receipts detection means, is connected the coal dust and is returned comb line.
Further, the underground coal mine automatic drilling device of turning sea also includes：Clamp and convey the continuous pipe send pipe
Device, is connected between the coil device and the pillar.
Further, the coil device is roller.
Further, the underground coal mine automatic drilling device of turning sea also includes：Connect the hydraulic power unit of the roller.
Further, the underground coal mine automatic drilling device of turning sea also includes：The water tank being connected with the pressurization pump truck.
Further, the entrance of the continuous pipe connects the pressurization pump truck by rotating seal.
Further, the underground coal mine automatic drilling device of turning sea also includes：It is arranged on the pillar and is covered in institute
State the protection shield on raw coal operation supporting surface.
Further, the protection shield is set in outside pillar, for globular hinge is connected between the protection shield and pillar.
The utility model has the effect that：
1) continuous pipe operation is used, without adding chi manually or unloading drilling rod, a large amount of operating times and manpower is saved,
2) propulsive force can adjust, by adjusting coil device, so that adjustable rate of penetration, it is adaptable to which various soft or hard coal seams are very
To rock stratum, have a wide range of application,
3) after continuous pipe launches, operation distance is more long, it is thus achieved that the remote-controlled operation of personnel, effectively ensures people
Personal safety,
4) after single borehole pore-forming, then by pulling back back and forth several times, can by more than 1 times of borehole enlargement, for into
It is cost-effective for the preferable coal seam of permeability, it is possible to reduce cloth hole number, or on the basis of cloth hole number is constant, shortening is taken out
Adopt the time,
5) continuous pipe and shower nozzle can be reused many times as consumable material, even if there are more frequently boring accidents,
Because the cost of consumptive material is relatively low, economic loss is smaller, such as causes collapse hole accident, and drilling tool can not be extracted, and can block continuous pipe,
Continuous pipe can be stayed in hole and continue the effect for playing support and passage, not cause useless hole, and this is opened high methane weak seam
Adopt extremely advantageous.
Brief description of the drawings
Fig. 1 is the structural representation and fundamental diagram of underground coal mine automatic drilling device of turning of the present utility model.
Drawing reference numeral explanation：
1 pressurization pump truck 2 preposition 6 pipe-conveying device of steel pipe, 7 pillar 8 that is oriented to of continuous 3 coil device of pipe 5 protects shield 9 to rotate
The coal dust of 10 raw coal operation supporting surface of shower nozzle 11 return the gas of comb line 12 return flow back to receipts the tunnel 31 of detection means 20 rotate
The drilling direction of 35 hydraulic oil pipe of sealer, 37 hydraulic power unit 40
Specific embodiment
In order to be more clearly understood to technical characteristic of the present utility model, purpose and effect, now control is illustrated
The utility model.
As shown in figure 1, the utility model proposes a kind of underground coal mine automatic drilling device of turning, being arranged on the underground of underground coal mine
In tunnel 20, for example, it is used for horizontal drilling, or high inclination-angle drilling, mash gas extraction is carried out, improve gas pumping effect, the coal
Automatic drilling device of turning includes under mine：
Pressurization pump truck 1, i.e. high pressure pump truck, for the liquid (water) being input into continuous pipe is pressurizeed；Pressurization pump truck 1 provides height
The maximum pressure of pressure water jet is 100MPA, and rated discharge is 150L/min, and the rated power of the pump truck 1 that pressurizes can be 250KW；
Continuous pipe 2, is metal tube, and the entrance that continuous pipe has entrance and exit, the continuous pipe connects the force (forcing) pump
Car 1；The outlet of the continuous pipe is used to extend into raw coal operation supporting surface 10；The caliber of the continuous pipe for using is, for example,
50mm, no more than 60mm；
Coil device 3, connects the continuous pipe 2, for releasing or reclaiming continuous pipe；Continuous pipe 2 is metal tube, with certain
Amount of deflection, can coil on coil device 3, by the rotation of coil device 3, continuous pipe 2 can be discharged out；
Pillar 7, also referred to as conduit, are set in outside the continuous pipe 2 and are pushed against on raw coal operation supporting surface 10 and connect
In the downstream of the coil device 3；The pillar 7 is cross pipe, and the pillar 7 has the axial passage of the conveying continuous pipe
With the side path of the row's of returning coal dust；Axial passage and the intersecting across of side path；Pillar 7 be it is harder than the material of continuous pipe 2,
, than the length of continuous pipe 2 shorter one section cross metal tube thicker than the external diameter of continuous pipe 2, acts orienting straight, and crosshead is solid
Fixed continuous pipe is placed in the middle to make continuous Guan Nengzhuan again；The more continuous pipe external diameter of pillar internal diameter is more than 10mm, to be preferably oriented to continuous pipe.
Rotary nozzle 9, is connected to the exit of the continuous pipe 2, for boring Kaiyuan coal operation supporting surface 10 or operation coal
Layer；The rotary nozzle of use possesses three kinds of different spray eyes in itself, and a fluid stream that preceding spray eye is formed is cut and crushed to coal seam,
The a fluid stream that spray eye placed in the middle is formed is supported and expanding, a fluid stream that rear end spray eye is formed pushing away forward by reaction force offer
Power, while setting up hole inner cycle channel, carries coal dust ickings outside；Rotary nozzle can meet above-mentioned bar using in the market is existing
The high pressure porous nozzle of part, jet diameters 20-50mm, nozzle 6-9；Rotary nozzle can be repeatedly used；
High-pressure pump is medium conductor with water, and pressure is sent into shower nozzle in coiled tubing by water, has shower nozzle and cuts
Bad high-pressure water jet is cut through, cutting and crushing is carried out to coal seam, to form radial water adit；
Coal dust returns comb line 11, is connected on the side path of the pillar 6；Coal dust and ickings from pillar with continuously manage it
Between annular space into the side path of the row's of returning coal dust of pillar, return comb line 11 hence into coal dust；
Gas is returned and flows back to receipts detection means 12, is connected the coal dust and is returned comb line 11, can detect gas.If generation gas
Transfinite etc. and to be unfavorable for the phenomenon of job safety, should stop operation in time, to ensure safety.
Further, the underground coal mine automatic drilling device of turning sea also includes：Clamp and convey the continuous pipe send pipe
Device 6 (also referred to as injection device, can use the injection device in well workover industry) is connected to the coil device 3 and the pillar 7
Between, to ensure the dynamics of drilling and the speed of adjustment drilling.Pipe-conveying device can clamp rotating manner using multiple twin dish structure,
Additionally apply a forward thrust to playpipe in course of injection, additionally apply a pull-out to playpipe during pulling back
Power.Pipe-conveying device can be to be threadedly coupled with pillar.Pipe-conveying device 6 is the clamping device of chain gear transmission, and clamping device can
Think that grip block, grip block drive chain (along boring direction 40) to be sent into spray after clamping playpipe (continuous pipe) by hydraulic motor
Penetrate pipe.Pipe-conveying device can provide propulsion and pullout forces design maximum is 500KG.The power source of pipe-conveying device can be from anti-
Quick-fried motor.In order that continuous pipe is more smoothly entered in coal seam, can also be in the downstream of pipe-conveying device 6 (also referred to as injection device)
The preposition guide pipe 5 being set in outside continuous pipe is set to before entering into coal seam, and preposition guide pipe 5 is rigid pipe, is risen to even
Continuous pipe guide effect a, part for preposition guide pipe is inserted in coal seam, and another part is exposed, and (this part is set in pillar 7
In).
Further, the coil device 3 is roller, and roller has 6 tons of drag, can easily release or reclaim continuous
Pipe, occupies little space.
Further, the underground coal mine automatic drilling device of turning also includes：The roller is connected by hydraulic oil pipe 35
Hydraulic power unit 37, in such manner, it is possible to steady strong releasing or the continuous pipe 2 of recovery.Continuous pipe is evenly arranged in circle by track
In cylindrical drum, the control drum functions of hydraulic power unit 37 are rotated by roller, carry out the releasing or recovery of continuous pipe.Liquid
The power source of pressure power unit 37 can derive from fire-proof motor.
Further, the underground coal mine automatic drilling device of turning also includes：The water tank being connected with the pressurization pump truck 1.Water
Case storage construction injection liquid (water).Pressurization pump truck 1 for example connects water tank, the construction liquid (for example, water) in water tank by centrifugal pump
By the entrance of centrifugal pumping to high-pressure pump, the entrance of high-pressure pump can be provided with filter, and filtering is unfavorable for the impurity of drilling.
Motor driven liquid presses system to provide power to high-pressure pump, drives the three-cylinder plunger pump in high-pressure pump to do piston movement, is Jie with water
Matter conductor, shower nozzle is sent to by water by pressure in coiled tubing, shower nozzle is had the high-pressure water jet of failure by shear, to coal
Layer carries out cutting and crushing, to form radial water adit.Water tank inflow includes that the volume of two parallel connections is the water pot of 1 side, water pot material
Matter is stainless steel, and using the anti-design of colliding with of fillet, each water pot exports a separately installed valve.
Further, the entrance of the continuous pipe connects the pressurization pump truck 1 by rotating seal 31, continuous to meet
Sealing of the pipe 2 during feeding.
Further, the underground coal mine automatic drilling device of turning also includes：It is set on the pillar and is covered in and is described
Protection shield 7 on raw coal operation supporting surface, prevents in high-pressure water jet drilling operation, and water jet reaction force is to artificial into wound
Evil；Control gas are oriented to when running into Gas Outburst, it is ensured that coal dust is gushed during the channel set for arranging mouth is returned by coal dust.Protection shield be, for example,
Circular or cone baffle plate, radius is more than boring radius and the radius of pillar；The centre for protecting shield is connecting hole, for even
Connect pillar.Can be with globular hinge connected mode between protection shield and pillar.Angle between pillar and protection shield can be at 0 °~80 °
Between arbitrarily adjust.
Further, pressurization pump truck 1, roller and pipe-conveying device connection fire-proof motor, pressurization and send pipe to fill at pump truck 1, roller
The work put provides power source by fire-proof motor, to be adapted to underground work；The power of motor of fire-proof motor is designed as 315KW (tools
Body performance number can determine according to the load of high-pressure pump, roller, pipe-conveying device), 1140V, explosive-proof grade EXD I have MA to indicate.It is anti-
Quick-fried motor driven liquid pressure power unit provides power to high-pressure pump, drives the three-cylinder plunger pump in high-pressure pump to do piston movement, with
Water is medium conductor, and pressure is sent into shower nozzle in coiled tubing by water, shower nozzle is had the high-pressure water shot of failure by shear
Stream, carries out cutting and crushing, to form radial water adit to coal seam.
The utility model also has operating desk, manipulates construction operation.Operating desk is provided with the control units such as button, knob, even
Pressurization pump truck, coil device etc. are connect, by the button on operating desk, knob, to pump pressure, jet velocity, injection pressure, pullback rate
Precisely operated.By operating desk digital-controlled instrument, the parameters in display operation, and analysis to stratum of constructing and sentence
It is disconnected, and by data analysis, to spraying operation in various situations summarize.Pressurization pump truck, coil device, fire-proof motor, water
Case, can be adjusted in the distance within 50 meters, the production environment complicated to adapt to underground, reach the purpose of safety in production.
As shown in figure 1, the utility model also proposes a kind of underground coal mine automatic drilling method, the underground coal mine automatic drill
Hole method is for example, can take foregoing underground coal mine automatic drilling device of turning, the boring method to comprise the following steps：
Step A：High-Pressure Water (maximum pressure is 100MPA) is transported at rotary nozzle 9 with continuous pipe 2, uses rotation spray
First 9 High-Pressure Waters for spraying bore Kaiyuan coal operation supporting surface 10, and water conservancy drilling is carried out to raw coal operation supporting surface 10；
Step B：Then the continuous pipe is continuously fed to raw coal operation supporting surface 20 by coil device 3, this process is not
With adding chi manually or unloading drilling rod, a large amount of operating times and manpower are saved；Continuous pipe 2 and rotary nozzle 9 are constantly made in the raw coal
Advance in industry supporting surface, the drilled tunnel until getting out predetermined length is most long up to 200 meters.
Injection liquid is pressurizeed by high-pressure pump, by continuous pipe, reaches connected rotary nozzle, by high speed pay-out out,
Strike purpose coal seam pore-forming.By remote control in drilling process, the automation of drilling is realized, reach safe and efficient production
Purpose.
Further, the underground coal mine automatic drilling method is further comprising the steps of：After single borehole pore-forming, that is, complete
After once drilling, then by pulling back back and forth several times, can be by more than 1 times of borehole enlargement.Using continuous pipe high-pressure water jet
Drilling, can easily reaming, it is cost-effective for the preferable coal seam of pore-creating character, it is possible to reduce cloth hole number, or in cloth
On the basis of hole number is constant, shorten the extraction time.
Further, the underground coal mine automatic drilling method is further comprising the steps of：When collapse hole accident is caused, by institute
State continuous pipe to block, stay in the raw coal operation supporting surface.
The workflow that the utility model is used is：
1st, preparation
(1) coal seam underlying parameter is obtained.Occurrence condition, mechanical strength and gas pumping parameter including coal seam etc..
(2) detail design.According to the gas pumping requirement in the underlying parameter and tunnel in coal seam, drilling is reasonably arranged,
The suitable pump pressure of selection and flow, write water-jet drilling design.
(3) equipment goods and materials admission.Construction site in tunnel is planned, under enter, install and debug water-jet drilling
Equipment, ensures water supply for construction and power supply etc..
2nd, high-pressure water jet drilling
(1) start the high-pressure pump on high pressure pump truck, cleaning is rinsed to pipeline, then by swivel nozzle and flexible pipe (even
Continuous pipe) connection.
(2) after high pressure pump pressure reaches penetrating pressure, start roller and injection device, be sent into flexible continuous pipe.
(3) high-pressure hydraulic jet hole operation is carried out, according to actual conditions during spirt, adjustment injection pressure and spray
Firing rate degree, and can according to circumstances carry out the stop of stage and repeatedly pull back repeatedly.After single borehole pore-forming, then by reciprocal
Repeatedly pull back several times, can by more than 1 times of borehole enlargement, for the preferable coal seam of pore-creating character, it is possible to reduce cloth hole number,
It is cost-effective, or on the basis of cloth hole number is constant, shorten the extraction time.
(4) in high pressure jet flow bore operation, the gas density and various phenomenons of working face are paid close attention to, if occurring
Gas exceeding limit etc. is unfavorable for the phenomenon of job safety, should stop operation in time, to ensure safety.
(5) after the completion of high-pressure water jet drilling, prepare sealing of hole, after completing sealing of hole, carry out gas pumping.
The utility model can form underground gas extraction new technology, it is adaptable to which mining face under mine level or high inclination-angle are bored
Hole, carries out mash gas extraction, improves gas pumping effect, and reduces cost ensures safety.
The schematical specific embodiment of the utility model is the foregoing is only, model of the present utility model is not limited to
Enclose.For each part of the present utility model can be mutually combined under conditions of not conflicting, any those skilled in the art,
Done equivalent variations and modification, all should belong to this practicality new on the premise of design of the present utility model and principle is not departed from
The scope of type protection.
Claims (8)
1. a kind of underground coal mine automatic drilling device of turning, is arranged in the tunnel of underground coal mine, it is characterised in that the colliery
Underground automatic drilling device of turning includes：
Pressurization pump truck；
Continuous pipe, the entrance that continuous pipe has entrance and exit, the continuous pipe connects the pressurization pump truck；The continuous pipe
Export for extending into raw coal operation supporting surface；
Coil device, connects the continuous pipe；
Pillar, is set in outside the continuous pipe and is pushed against on raw coal operation supporting surface and be connected under the coil device
Trip；The pillar is cross pipe, and the pillar has the axial passage of the conveying continuous pipe lateral logical with the row's of returning coal dust
Road；
Rotary nozzle, is connected to the exit of the continuous pipe；
Coal dust returns comb line, is connected on the side path of the pillar；
Gas is returned and flows back to receipts detection means, is connected the coal dust and is returned comb line.
2. underground coal mine automatic drilling device of turning as claimed in claim 1, it is characterised in that the underground coal mine automatic drilling dress
Putting sea also includes：The pipe-conveying device of the continuous pipe is clamped and conveyed, is connected between the coil device and the pillar.
3. underground coal mine automatic drilling device of turning as claimed in claim 1, it is characterised in that the underground coal mine automatic drilling dress
Putting sea also includes：
Coal dust returns comb line, is connected on the side path of the pillar；
Gas is returned and flows back to receipts detection means, is connected the coal dust and is returned comb line.
4. underground coal mine automatic drilling device of turning as claimed in claim 3, it is characterised in that the coil device is roller, described
Underground coal mine automatic drilling device of turning sea also includes：Connect the hydraulic power unit of the roller.
5. underground coal mine automatic drilling device of turning as claimed in claim 1, it is characterised in that the underground coal mine automatic drilling dress
Putting sea also includes：The water tank being connected with the pressurization pump truck.
6. underground coal mine automatic drilling device of turning as claimed in claim 1, it is characterised in that the entrance of the continuous pipe is by rotation
Turn sealer and connect the pressurization pump truck.
7. underground coal mine automatic drilling device of turning as claimed in claim 1, it is characterised in that the underground coal mine automatic drilling dress
Putting sea also includes：It is arranged on the pillar and is covered in the protection shield on the raw coal operation supporting surface.
8. underground coal mine automatic drilling device of turning as claimed in claim 7, it is characterised in that the protection shield be set in pillar it
Outward, for globular hinge is connected between the protection shield and pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621325354.4U CN206220855U (en) | 2016-12-05 | 2016-12-05 | Underground coal mine automatic drilling device of turning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621325354.4U CN206220855U (en) | 2016-12-05 | 2016-12-05 | Underground coal mine automatic drilling device of turning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206220855U true CN206220855U (en) | 2017-06-06 |
Family
ID=58784431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621325354.4U Expired - Fee Related CN206220855U (en) | 2016-12-05 | 2016-12-05 | Underground coal mine automatic drilling device of turning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206220855U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703698A (en) * | 2016-12-05 | 2017-05-24 | 泰尔达能源科技（北京）有限公司 | Underground coal mine auto-drilling apparatus and method |
-
2016
- 2016-12-05 CN CN201621325354.4U patent/CN206220855U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703698A (en) * | 2016-12-05 | 2017-05-24 | 泰尔达能源科技（北京）有限公司 | Underground coal mine auto-drilling apparatus and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110617044B (en) | Ultrahigh-pressure water jet slotting system and using method thereof | |
| CN106320985B (en) | Coal seam high-pressure water jet drill, which expands, cuts integrated permeability improvement device and its method | |
| CN105156085B (en) | The coal mine underground coal bed tree-shaped uniform anti-reflection method of drilling composite fracturing | |
| CN104864177B (en) | A kind of no-dig technique bores top and combines Pipeline Crossing Program method | |
| CN108547604B (en) | Drilling and stamping integrated device and method | |
| CN103016044A (en) | Comprehensive method of drilling, permeability increasing, repairing and gas-driven displacing of drill hole underground coal mine | |
| CN102966309B (en) | High-pressure grinding material jet flow drill carriage device | |
| CN110685683A (en) | Top-releasing device and method for front-mixing type abrasive water jet flow directional cutting top plate | |
| US20150107905A1 (en) | Hydraulic borehole mining system and method | |
| CN114165198B (en) | Directional hydraulic fracturing coal seam pressure relief and permeability increase device and pressure relief and permeability increase method | |
| CN105569619A (en) | Abrasive perforating unblocking method and device for coiled tubing | |
| US7849937B2 (en) | Method and device for producing a cased string bore | |
| CN106703698A (en) | Underground coal mine auto-drilling apparatus and method | |
| CN206220855U (en) | Underground coal mine automatic drilling device of turning | |
| CN107217988A (en) | A kind of driving face in coal mine high-pressure hydraulic perforating machine | |
| CN106639997B (en) | Device and method for reducing viscosity of heavy oil by injecting agent through high-pressure water jet of continuous oil pipe | |
| CN103643899A (en) | Integrated drilling-cutting drill rod device | |
| CN203547562U (en) | Integrated drilling and cutting drill stem | |
| US11008846B2 (en) | Water jet mining system and method | |
| CN103573193A (en) | Integrated drilling and splitting drill stem device | |
| CN115638018A (en) | Rapid cross-cut coal uncovering system and method based on physical fluidization simultaneous mining of coal and gas | |
| CN115726781A (en) | Equipment for in-situ drilling, cutting and weakening rock mass and operation method | |
| CN212428582U (en) | Coal rock drilling internal directional joint cutting device based on abrasive water jet technology | |
| CN210829247U (en) | Top-laying device for front-mixing type abrasive water jet flow directional cutting top plate | |
| CN112127854A (en) | Staged fracturing and extraction method for long drill hole of coal seam and pressure-extraction integrated device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170606 Termination date: 20181205 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |