CN209040750U - A kind of anti-collapse aperture apparatus of drainage from coal seam drilling - Google Patents
A kind of anti-collapse aperture apparatus of drainage from coal seam drilling Download PDFInfo
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- CN209040750U CN209040750U CN201821641461.7U CN201821641461U CN209040750U CN 209040750 U CN209040750 U CN 209040750U CN 201821641461 U CN201821641461 U CN 201821641461U CN 209040750 U CN209040750 U CN 209040750U
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- carbon fiber
- drilling
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- fiber bar
- cylindrical stent
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Abstract
The utility model discloses a kind of anti-collapse aperture apparatus of drainage from coal seam drilling, including carbon fiber bar, flexible air-bag, cylindrical stent；The utility model also provides a kind of drainage from coal seam drilling anti-collapse hole method, the carbon fiber bar equipped with cylindrical stent is put into inside hollow drill by way of lower loop bar, with the progress for the process of drilling, the guarantee of carbon fiber bar is constantly installed additional to be completely embedded, cylindrical stent is set to carry out the bore inner that deepens continuously with the process of drilling, so that the distance of cylindrical stent supporting greatly promotes, later, it drills after reaching target position, start move back driller's work, carbon fiber pipe and bracket still stay in the borehole, it moves back and the length of carbon fiber bar is adjusted during boring, the easy collapse hole position for allowing to reach prediction carries out accurate supporting；Finally, being inflated by carbon fiber bar into the air bag among bracket, struts bracket and be bonded with hole wall, play support action.
Description
Technical field
The utility model relates to mine gas extraction drilling technique field, especially a kind of anti-collapse hole dress of drainage from coal seam drilling
It sets.
Background technique
High methane weak seam deep well drilling collapse hole is to restrict one of the difficulty of the efficient extraction of gas.Compared to other rock stratum,
Weak seam has specific physical mechanical property, and particularity causes weak seam firedamp taking-out discharging drilling to be easy in drilling process
Cause drilling drilling not deep, drill phenomena such as deforming, collapsing, and gas drainage rate is greatly reduced, project progress is seriously limited,
Influence safety in production.Nowadays mainly have using more anti-collapse hole technology: 1. after Completion of Drilling Hole, proposing drilling rod, under
Methane extraction screen casing carries out guard aperture, but this method needs cleaning bottom of hole of constantly blowing when mentioning brill, useless power when giving up, inefficiency,
Screen casing transfers depth as shallow；2. decentralization gas drainage screen casing carries out guard aperture, the party after the completion of construction drill under auxiliary device effect
Method mainly installs the auxiliary devices such as pulley, ball on guard aperture screen casing, reduces the friction between guard aperture screen casing and hole wall, guard aperture
The decentralization depth of screen casing increased, but the device of this method is complicated, and drilling accident frequent occurrence during screen casing lower section；
3. safeguarding borehole wall using the degradable flushing liquor of external import, but such flushing liquor only Directional Drilling of individual coal mines at home
Into using in the process, and flushing liquor valuable product, the gasresolution of drilling coal body is need to be investigated.4. overall length is sieved
Manage and protect hole gas drainage technology, the technology by develop large through-hole can open and close type drill bit, using manual type, by extraction screen casing from
The inner via hole of drilling rod transfers to drilling the inside, when gas drainage screen casing is transported to drill bit position, under the action of axial thrust
Three " petal " shapes in drill bit center are opened, gas drainage screen casing transfers to foot of hole by the inner via hole of drill bit, in hole
Being fixed on foot of hole under the action of the fixed device in bottom, then drilling rod is exited in rotation, by the extraction of anti-electrostatic fire retardant crushibility material
Screen casing stays in entire drilling.This method is time-consuming and laborious, puts into larger.
Therefore, a kind of easy to use, economical economy is developed, the anti-collapse of accurate supporting can be carried out to drilling collapse hole region
Aperture apparatus, become improve coal mine gas drainage efficiency there is an urgent need to.
Utility model content
The purpose of this utility model is the deficiencies in the prior art to be solved, and it is anti-collapse to provide a kind of drainage from coal seam drilling
Aperture apparatus.
In order to achieve the above objectives, the utility model is implemented according to following technical scheme:
A kind of anti-collapse aperture apparatus of drainage from coal seam drilling, including one end is equipped with internal screw thread, the other end is equipped with externally threaded carbon fiber
Tie up bar, the flexible air-bag being coated on outside carbon fiber bar, and the cylindrical stent being nested with outside carbon fiber bar, the carbon fiber bar
Surface offers several stomatas being connected to flexible air-bag inside；The cylindrical stent includes several X-type fire-resistant antistatic modelings
Expect that frame, each X-type fire-resistant antistatic plastic processing frame are assembled by the fire-resistant antistatic plastic sheet of two equal lengths, hinders
Among combustion electrostatic prevention plastic tablet and both ends offer axis hole, pass through the axis among two fire-resistant antistatic plastic sheets with plastic shaft
Two fire-resistant antistatic plastic sheets are closed up to form X architecture by hole, the jackshaft between two fire-resistant antistatic plastic sheet opposite faces
Contrary teeth are equipped with around hole to make X architecture that can only be unfolded and cannot close up；It is fire-retardant anti-per two adjacent X-types
Two adjacent X-types are hindered with the axis hole that plastic shaft passes through two fire-resistant antistatic plastic sheet ends respectively between electrostatic plastic processing frame
Combustion antistatic plastic frame is connected together through a hinge until forming a cylindrical body.
Further, the anti-collapse aperture apparatus of a kind of drainage from coal seam drilling of the utility model, further includes for connecting two or two
A above cylindrical stent and the plastic buckle for increasing cylindrical stent height, the plastic buckle two sides are symmetrically arranged with C-shaped
Bayonet, the C-shaped bayonet is for rotating the plastic shaft for being connected to neighbouring X-type fire-resistant antistatic plastic processing frame end.
Further, the cylindrical stent is wrapped with a circle net retardance.
Further, the teeth shape is right angled triangle, and right low left high surrounds two fire-resistant antistatic plastics clockwise
One circle of intermediate shaft hole distribution between piece opposite face.The X architecture closed up that two fire-resistant antistatic plastic sheets are formed, the two can be with
It is rotated around intermediate plastic shaft, but due to there is the tooth of opposite direction around intermediate axis hole position, so that the X architecture is only
It can be unfolded and cannot close up.
In addition, the utility model also provides a kind of drainage from coal seam drilling anti-collapse hole method, comprising the following steps:
Step 1: judging the position S1 and length L that collapse hole situation may occur1: during being drilled according to upper one drilling,
Real-time change, bit freezing situation, the real-time change situation for speed of drilling or other effective ways approximations of coal output judge this brill
The length L that hole collapse hole situation may occur1, according to length L1Splicing a segment length is L2Cylindrical stent, wherein L2=L1+
1m；
Step 2: taking one section of carbon fiber bar, which is coated with one layer of flexible air-bag, on carbon fiber bar surface
Offer it is several with flexible air-bag inside be connected to for the stomata to air bag gas injection and exhaust, cylindrical stent is covered in the carbon fiber
It is fixed outside dimension bar, and is wrapped with a circle net retardance in cylindrical stent；
Step 3: drilling: according to coal mine gas extraction drill hole design requirement, being marked, move in next bore position
Dynamic machine of drilling combines hollow drill and open type drill bit and is mounted on the machine of drilling to mark position, mark position start into
Row is drilled；After the completion of the rod boring newly installed additional, the connection between the drilling rod and drilling machine that drilling is completed first is released, then drilling machine
Drilling section is drawn back a distance, takes one section of new drilling rod, new drilling rod is connect with drilling machine, adjusts drilling machine drilling section, is made new
Drilling rod is closely connect with the drilling rod for completing drilling；
Step 4: step 3 is repeated, until the drill bit for machine of drilling reaches the position S2, wherein S2=drilling design length
Then the position S1 that S3- collapse hole situation may occur takes n-th drilling rod to carry out installation and continues to creep into；
Step 5: when drillable length reaches design length, stopping, which is drilled, starts to carry out to move back driller's work, machine drilling part of drilling
Divide a distance of drawing back, last section is bored in the connection for releasing last section of drilling rod and drilling between machine and upper one section of drilling rod
Bar unloads；By exposed carbon fiber bar by jacking mechanism, it is pushed in hollow drill, drilling section is to Forward, then
Drilling section and drilling rod are reconnected；The step is repeated later, until whole drilling rods are moved back and are drilled into；
Step 6: drawing a tracheae from air-supply pipeline, carbon fiber bar and tracheae are connected with valve, open valve
Door, is inflated by carbon fiber bar into the flexible air-bag among cylindrical stent, and flexible air-bag expansion is made to become larger while strut circle
Cylindrical stent is close to cylindrical stent surrounding with the wall of a borehole；Then tracheae is laid down, valve is opened, by the gas in flexible air-bag
Body is all released, and shrinks flexible air-bag again, has reversed tooth at the X-type structure jackshaft of cylindrical stent, so that bracket supports
The support action to the wall of a borehole is kept after opening, without shrinking again；Lay down valve；
Step 7: taking out carbon fiber bar；
Step 8: starting to carry out sealing of hole operation.
Further, in the step 4, if run of steel L3> cylindrical stent length L2, then when n-th drilling rod is drilled
When completion, (n+1)th drilling rod is taken to assemble therewith, then takes the carbon fiber bar for assembling cylindrical stent, be inserted into core drill
Among bar, finally (n+1)th hollow drill is connect with the machine of drilling；Process of drilling then is carried out again, when (n+1)th drilling rod is beaten
After being drilled, the drilling rod of equal length and each one, carbon fiber bar are taken, first takes the carbon fiber in new carbon fiber bar and hollow drill
Bar is threadedly coupled, drilling rod then new in carbon fiber bar housing, is finally reconnected drilling rod and drilling machine, is carried out work of drilling again
Make；Aforesaid operations are repeated later.
Further, in the step 4, if run of steel L3< stent length L2< mL3, then when the n-th+m-1 root drilling rod
It drills when completing, takes the n-th+m root drilling rod to assemble therewith, then take the carbon fiber bar for assembling cylindrical stent, be inserted into sky
Among heart drilling rod, the n-th+m branch hollow drill is connect with the machine of drilling finally, process of drilling then is carried out again, when the n-th+m branch
After drilling rod has been drilled, the drilling rod of equal length and each one, carbon fiber bar are taken, is first taken in new carbon fiber bar and hollow drill
Carbon fiber bar is threadedly coupled, drilling rod then new in carbon fiber bar housing, is finally reconnected drilling rod and drilling machine, is carried out again
It drills work；Aforesaid operations are repeated later.
Further, in the step 7, if collapse hole positional distance hell is farther out, the too long recycling of carbon fiber support has tired
Carbon fiber bar is then fixed on drilling machine using fixed device, is exited carbon fiber bar by way of moving back brill by difficulty；If collapse hole
Positional distance aperture is closer, and the shorter recycling of carbon fiber support is simple, then is successively extracted carbon fiber bar out with hand.
Compared with prior art, the utility model has the advantage that
1, the utility model design structure is simple, more convenient to use quick compared with the utility model of similar effect.
2, the utility model deft design, cylindrical stent can freely form different sizes and meet different length
The needs in collapse hole region.
3, the utility model is more economical and practical compared with other products.
4, the utility model cylindrical stent is fire-resistant antistatic rubber material, and intensity is high, and good toughness is sturdy and durable, branch
It is obvious to protect effect.Cylindrical stent has better stability and anti-deformation behavior, and is close to the wall of a borehole, to gas in drilling
The influence of flowing is very small.
5, the utility model cylindrical stent uses carbon fiber bar, and the material is light, and solid, toughness is strong.So that
Cylindrical stent can be sent to the position for going deep into foot of hole.
In conclusion the utility model structure is simple, rationally, this system is mainly by cylindrical stent, carbon fiber bar for design,
Flexible air-bag three parts are constituted.As cylindrical stent, flexible air-bag, carbon fiber bar are sent to easy collapse hole area by carrying out of drilling
Domain is then inflated into flexible air-bag by carbon fiber bar, struts cylindrical stent finally by the flexible air-bag of expansion, is blocked
The support action to the wall of a borehole is completed in jail.The utility model is easy to operate, practical, and effect is good, is suitble to promote the use of.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the fire-resistant antistatic plastic sheet of the utility model.
Fig. 2 is the structural schematic diagram of the X-type fire-resistant antistatic plastic processing frame of the utility model.
Fig. 3 is multiple X-type fire-resistant antistatic plastic processing frame connection schematic diagrams of the utility model.
Fig. 4 is the X-shaped fire-resistant antistatic plastic processing frame of the utility model and the attachment structure schematic diagram of plastic buckle.
Fig. 5 is the structural schematic diagram of plastic buckle.
Fig. 6 is the structural schematic diagram of cylindrical stent.
Fig. 7 is the structural schematic diagram that multiple cylindrical stents are connected by plastic buckle.
Fig. 8 is the structural schematic diagram of carbon fiber bar.
Fig. 9 is the connection schematic diagram of carbon fiber bar and flexible air-bag.
Figure 10 is the usage state diagram of the utility model.
Specific embodiment
The utility model is further described combined with specific embodiments below, in the illustrative examples of this utility model
And explanation is used to explain the utility model, but is not intended to limit the scope of the present invention.
As Figure 1-10 shows, a kind of drainage from coal seam of the present embodiment drills anti-collapse aperture apparatus, including one end be equipped with internal screw thread,
The other end is equipped with the carbon fiber bar 7 of external screw thread 8, the flexible air-bag 5 being coated on outside carbon fiber bar 7, and is nested in carbon fiber bar 7
Outer cylindrical stent, 7 surface of carbon fiber bar offer several with stomata 6 that is being connected to inside flexible air-bag 5；The cylinder
Shape bracket includes several X-type fire-resistant antistatic plastic processing frames, and each X-type fire-resistant antistatic plastic processing frame is by two equal lengths
Fire-resistant antistatic plastic sheet 1 assemble, among fire-resistant antistatic plastic sheet 1 and both ends offer axis hole 101, use plastics
The axis hole 101 that axis 3 passes through among two fire-resistant antistatic plastic sheets 1 closes up two fire-resistant antistatic plastic sheets 1 to form X knot
Structure is equipped with contrary teeth 2 to make X around the intermediate shaft hole 101 between two 1 opposite faces of fire-resistant antistatic plastic sheet
Structure can only be unfolded and cannot close up, and specifically, teeth shape 2 is right angled triangle, right low left high, clockwise around two resistances
Fire one circle of the distribution of intermediate shaft hole 101 between 1 opposite face of electrostatic prevention plastic tablet；Per two adjacent X-type fire-resistant antistatic plastics
The axis hole 101 for passing through two 1 ends of fire-resistant antistatic plastic sheet with plastic shaft 3 respectively between frame is fire-retardant by two adjacent X-types
Antistatic plastic frame is connected together through a hinge until forming a cylindrical body.The working principle of the cylindrical body: by the cylindrical body
Hollow part apply the power expanded outwardly so that X architecture is expanded, the circular cross-section of cylindrical body becomes larger, and the height of cylinder becomes smaller.
The supporting section that the process forms the cylindrical body becomes larger.It in the present embodiment, is inflated by carbon fiber bar 7, gas
Enter flexible air-bag 5 by 6 hole of gas on carbon fiber bar surface, with the progress of inflation, the constantly expansion of flexible air-bag 5 becomes larger, will
This carbon fiber bar 7 for being coated with flexible air-bag 5 is inserted into the intermediate region of cylindrical stent, and guaranteeing can be with when flexible air-bag 5 expands
Cylindrical stent is entirely propped up.
In this implementation, in order to increase the height of cylindrical stent, a kind of drainage from coal seam drilling of the present embodiment is anti-
Collapse hole device further includes increasing cylinder for connecting two or more cylindrical stents as shown in Fig. 4, Fig. 5, Fig. 7
The plastic buckle 4 of shape support height, 4 two sides of plastic buckle are symmetrically arranged with C-shaped bayonet 41, and the C-shaped bayonet 41 is for turning
It is dynamic to be connected in the plastic shaft 3 of neighbouring X-type fire-resistant antistatic plastic processing frame end.The opening of the C shape bayonet 41 is slightly less than
Plastic shaft 3, can be caught in C-shaped bayonet 41 by the diameter of the plastic shaft 3 of X architecture end portion in this way, and it is not easy to fall off fall
Out.It can be connected by this multiple plastic buckle 4 between cylindrical stent, 4 number of plastic buckle is more, and connection is closer, together
When the height of cylindrical stent that also can according to need, connect different number of cylindrical stent.
In the present embodiment, cylindrical stent main body is fire-resistant antistatic rubber material, and intensity is high, good toughness, cylinder branch
Frame struts annular in shape, and bracket, which once struts, no longer to be shunk.
In the present embodiment, the expansion power resources of cylindrical stent are acted in intermediate 5 inflation of flexible air-bag.It is flexible
5 expandable interior space of air bag, which becomes larger, drives cylindrical stent to be unfolded.
In the actual construction process, a circle net retardance is also enclosed with outside the cylindrical stent.When cylindrical stent struts
Afterwards, net retardance is unfolded therewith, and bracket struts rear net retardance and wrapped up around bracket one week.The net retardance can stop big
Coal cinder is caving (coal that will not generate destruction to support space tiny for coal dust, coal grain etc. does not have barrier effect),
Guarantee there is a good gas drainage space after bracket is propped up.
In addition, this example additionally provides a kind of anti-collapse hole method of drainage from coal seam drilling, the specific steps are as follows:
Step 1: judging the position S1 and length L that collapse hole situation may occur1: during being drilled according to upper one drilling,
Real-time change, bit freezing situation, the real-time change situation for speed of drilling or other effective ways approximations of coal output judge this brill
The length L that hole collapse hole situation may occur1, according to length L1Splicing a segment length is L2Cylindrical stent, wherein L2=L1+
1m。
Step 2: taking one section of carbon fiber bar, which is coated with one layer of flexible air-bag, on carbon fiber bar surface
Offer it is several with flexible air-bag inside be connected to for the venthole to air bag gas injection and exhaust, cylindrical stent is covered in the carbon
Fiber rod fixes outside, and is wrapped with a circle net retardance in cylindrical stent.
Step 3: drilling: according to coal mine gas extraction drill hole design requirement, being marked, move in next bore position
Dynamic machine of drilling combines hollow drill and open type drill bit and is mounted on the machine of drilling to mark position, mark position start into
Row is drilled；After the completion of the rod boring newly installed additional, the connection between the drilling rod and drilling machine that drilling is completed first is released, then drilling machine
Drilling section is drawn back a distance, takes one section of new drilling rod, new drilling rod is connect with drilling machine, adjusts drilling machine drilling section, is made new
Drilling rod is closely connect with the drilling rod for completing drilling.
Step 4: step 3 is repeated, until the drill bit for machine of drilling reaches the position S2, wherein S2=drilling design length
Then the position S1 that S3- collapse hole situation may occur takes n-th drilling rod to carry out installation and continues to creep into；
Step 5: when drillable length reaches design length, stopping, which is drilled, starts to carry out to move back driller's work, machine drilling part of drilling
Divide a distance of drawing back, last section is bored in the connection for releasing last section of drilling rod and drilling between machine and upper one section of drilling rod
Bar unloads；By exposed carbon fiber bar by jacking mechanism, it is pushed in hollow drill, drilling section is to Forward, then
Drilling section and drilling rod are reconnected；The step is repeated later, until whole drilling rods are moved back and are drilled into；
If run of steel L3> cylindrical stent length L2, then when n-th drilling rod, which is drilled, to be completed, (n+1)th drilling rod is taken
It assembles therewith, then takes the carbon fiber bar for assembling cylindrical stent, be inserted among hollow drill, finally by (n+1)th
Hollow drill is connect with the machine of drilling；Process of drilling then is carried out again, after (n+1)th drilling rod has been drilled, takes equal length
Drilling rod and each one, carbon fiber bar, first take new carbon fiber bar to be threadedly coupled with the carbon fiber bar in hollow drill, then in carbon
Drilling rod and drilling machine are finally reconnected, carry out work of drilling again by the new drilling rod of fiber rod housing；Above-mentioned behaviour is repeated later
Make.
If run of steel L3< stent length L2< mL3, then when the n-th+m-1 root drilling rod, which is drilled, to be completed, the n-th+m root is taken
Drilling rod assembles therewith, then takes the carbon fiber bar for assembling cylindrical stent, is inserted among hollow drill, finally by n-th+
M branch hollow drill is connect with the machine of drilling, and then carries out process of drilling again, after the n-th+m branch drilling rod has been drilled, takes equal length
Drilling rod and each one, carbon fiber bar, first take new carbon fiber bar to be threadedly coupled with the carbon fiber bar in hollow drill, then exist
Drilling rod and drilling machine are finally reconnected, carry out work of drilling again by the new drilling rod of carbon fiber bar housing；Above-mentioned behaviour is repeated later
Make.
Step 6: drawing a tracheae from air-supply pipeline, carbon fiber bar and tracheae are connected with valve, open valve
Door, is inflated by carbon fiber bar into the flexible air-bag among cylindrical stent, and flexible air-bag expansion is made to become larger while strut circle
Cylindrical stent is close to cylindrical stent surrounding with the wall of a borehole；Then tracheae is laid down, valve is opened, by the gas in flexible air-bag
Body is all released, and shrinks flexible air-bag again, has reversed tooth at the X-type structure jackshaft of cylindrical stent, so that bracket supports
The support action to the wall of a borehole is kept after opening, without shrinking again；Lay down valve.
Step 7: taking out carbon fiber bar: if collapse hole positional distance hell is farther out, the too long recycling of carbon fiber support has tired
Carbon fiber bar is then fixed on drilling machine using fixed device, is exited carbon fiber bar by way of moving back brill by difficulty；If collapse hole
Positional distance aperture is closer, and the shorter recycling of carbon fiber support is simple, then is successively extracted carbon fiber bar out with hand.
Step 8: starting to carry out sealing of hole operation.
The limitation that the technical solution of the utility model is not limited to the above specific embodiments, all skills according to the present utility model
The technology deformation that art scheme is made, each falls within the protection scope of the utility model.
Claims (4)
- The anti-collapse aperture apparatus 1. a kind of drainage from coal seam drills, which is characterized in that be equipped with internal screw thread including one end, the other end is equipped with outer spiral shell The carbon fiber bar of line, the flexible air-bag being coated on outside carbon fiber bar, and the cylindrical stent being nested with outside carbon fiber bar, it is described Carbon fiber bar surface offers several stomatas being connected to flexible air-bag inside；The cylindrical stent includes that several X-types are fire-retardant Antistatic plastic frame, each X-type fire-resistant antistatic plastic processing frame by two equal lengths fire-resistant antistatic plastic sheet group It fills, among fire-resistant antistatic plastic sheet and both ends offer axis hole, pass through two fire-resistant antistatic plastics with plastic shaft Two fire-resistant antistatic plastic sheets are closed up to form X architecture by the axis hole among piece, two fire-resistant antistatic plastic sheet opposite faces it Between intermediate shaft hole around be equipped with contrary teeth to make X architecture that can only be unfolded and cannot close up；Per two adjacent X It respectively will be adjacent with the axis hole that plastic shaft passes through two fire-resistant antistatic plastic sheet ends between type fire-resistant antistatic plastic processing frame Two X-type fire-resistant antistatic plastic processing frames are connected together through a hinge until forming a cylindrical body.
- The anti-collapse aperture apparatus 2. drainage from coal seam according to claim 1 drills, it is characterised in that: further include for connecting two Or more than two cylindrical stents and increase the plastic buckle of cylindrical stent height, the plastic buckle two sides are symmetrically arranged with C-shaped bayonet, the C-shaped bayonet is for rotating the plastic shaft for being connected to neighbouring X-type fire-resistant antistatic plastic processing frame end.
- The anti-collapse aperture apparatus 3. drainage from coal seam according to claim 1 or 2 drills, it is characterised in that: the cylindrical stent It is wrapped with a circle net retardance.
- The anti-collapse aperture apparatus 4. drainage from coal seam according to claim 1 drills, it is characterised in that: the teeth shape is right angle Triangle, right low left high, the intermediate shaft hole distribution one between two fire-resistant antistatic plastic sheet opposite faces is enclosed clockwise.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018211736169 | 2018-07-23 | ||
| CN201821173616 | 2018-07-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209040750U true CN209040750U (en) | 2019-06-28 |
Family
ID=67035510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821641461.7U Expired - Fee Related CN209040750U (en) | 2018-07-23 | 2018-10-10 | A kind of anti-collapse aperture apparatus of drainage from coal seam drilling |
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| Country | Link |
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| CN (1) | CN209040750U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111794688A (en) * | 2020-07-30 | 2020-10-20 | 西安科技大学 | Volatile stable drilling and hole collapse prevention supporting device and method for soft coal seam |
-
2018
- 2018-10-10 CN CN201821641461.7U patent/CN209040750U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111794688A (en) * | 2020-07-30 | 2020-10-20 | 西安科技大学 | Volatile stable drilling and hole collapse prevention supporting device and method for soft coal seam |
| CN111794688B (en) * | 2020-07-30 | 2022-03-22 | 西安科技大学 | Volatile stable drilling and hole collapse prevention supporting device and method for soft coal seam |
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Granted publication date: 20190628 Termination date: 20201010 |