CN105134076B - The pneumatic propelling unit of the tree-shaped drilling of underground coal mine - Google Patents
The pneumatic propelling unit of the tree-shaped drilling of underground coal mine Download PDFInfo
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- CN105134076B CN105134076B CN201510579878.XA CN201510579878A CN105134076B CN 105134076 B CN105134076 B CN 105134076B CN 201510579878 A CN201510579878 A CN 201510579878A CN 105134076 B CN105134076 B CN 105134076B
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Abstract
A kind of pneumatic propelling unit of the tree-shaped drilling of underground coal mine, it is adaptable to the conveying of high-pressure resin pipe is carried out in the tree-shaped drilling of underground coal mine.It includes frame, synchronous pulley, compresses belt wheel, special-shaped synchronous cog belt, air motor, speed reducer output shaft, follower shaft, compression wheel shaft, compressor arm, spring, wing nut, conduit saddle mechanism, dust cover and corresponding link member.The present invention provides propulsive force by the frictional force produced by being fully contacted of belt wheel, cog belt and high-pressure resin pipe；The angle of stock is adjusted come in realizing for high-pressure resin pipe smoothly sending into the drilling at diverse location and inclination angle by conduit saddle mechanism.The frictional force that the present invention is provided is big, local damage to pipeline is small, mechanism has explosion prevention function, the conveying and take-up of high-pressure resin pipe can be realized, stepless time adjustment, and simple structure can be also carried out, size is smaller, light weight, long service life, conveying to high-pressure resin pipe when can efficiently accomplish waterpower drilling medium-length hole.
Description
Technical field
The invention belongs to coal mine underground coal bed gas extraction technical field, it is related to a kind of propulsion plant of high-pressure resin pipe, can
Suitable for safely and efficiently being conveyed to high-pressure resin pipe in the tree-shaped drilling of underground coal mine.
Background technology
As mining area coal seam extends to deep, while crustal stress increases with gas pressure, coal seam gas-bearing capacity has increased
Plus.And the characteristics of mining area ocurrence of coal seam complexity most of due to China, can not realize that coal body is unloaded on a large scale when drawing out methane
Pressure, causes to adopt greatly during stope run before to exhaust to drill a hole long that single hole gas drainage under suction scope is small, pumping volume is few, extraction concentration
Low, the gas pre-drainage time is long.For above-mentioned situation, there is scholar to propose that the tree-shaped drilling of self-advancing type water-jet increases gas permeability of coal seam
Technology, i.e., on the basis of former gas pumping mother hole, using high-pressure water jet broken rock principle, realize the complete multiple sub-aperture of jet drilling
New technology.
In the tree-shaped uphole of deep tree-shaped lateral aperture or different angles in being crept into using high-pressure water jet, due to pipeline
It is not enough from thrust produced by the frictional force and self-feeding bit of the resistance of itself, pipeline and the wall of a borehole, possibly cannot complete
The drilling for drilling over long distances, accordingly, it would be desirable to corresponding propulsion plant is conveyed to high-pressure resin pipeline.Chinese patent
What CN1443920 was announced《The directional drilling machine that water jet is continuously advanced》In refer to similar device, be that a kind of water jet is continuous
Advance the steel pipe propulsion plant of directional drilling machine.It drives the steel pipe being fixed on casing using driving gear set to rolling friction rotation
It is dynamic, promote steel pipe to advance by the frictional force between friction pulley and steel pipe.The mechanism only has two to provide friction to rolling friction pulley
Power, contact area is small, and produced frictional force is small, that is, the thrust for providing is not enough.What Chinese patent CN1558084 was announced《Continuously
The strong force propulsion plant of pipe》It is a kind of mechanism that thrust is provided for continuous steel pipe.It is in continuous steel pipe placement symmetrical above and below
Fixed friction block on conveyor chain, thrust is provided by the frictional force between the V-groove and continuous steel pipe on brake pad, and can
To realize rotating, there is provided positive-reverse thrust.The mechanism provides propulsive force greatly, and the local damage to continuous steel pipe is small, but structure
Complexity, it is bulky.Moreover, coal mine operation complicated condition, apparatus above drives by motor, and safety coefficient is low, and nothing
Method realizes electrodeless variable-speed.
Therefore, because in drilling during gun drilling, drilling length, pipeline is long, and resistance is big, or during the big uphole of dip angle of hole,
The inclination angle in hole is bigger, and more significantly, therefore resistance is also bigger for pipeline component in vertical direction, under both of these case before pipeline
Enter resistance all very big, depend merely on self-feeding bit is inadequate from thrust, it is therefore desirable to be additionally provided thrust device.
The propulsion plant for being presently used for water jet drilling is less, is mostly the device that thrust is provided for continuous steel pipe, and high
Then seldom, the design of existing propulsion plant still suffers from the problem for needing to solve to the propulsion plant of pressurizing resin pipe：
（1）Frictional force between mechanism and continuous pipe is small, and the propulsive force for being provided is not enough；
（2）Device structure is complicated, bulky；
（3）For the mechanism that high-pressure resin pipe provides thrust is few, the local damage to pipeline is big；
（4）Safety coefficient is low, it is impossible to realize variable speed.
The content of the invention
Deficiency it is an object of the invention to be directed to above-mentioned existing Push Technology, there is provided it is tree-shaped that one kind is applied to underground coal mine
The pneumatic propelling unit of drilling, meets simple structure, small volume, there is provided propulsive force is big, and the local damage to continuous pipe is small, essence
Safety etc. requires so that in drilling, deep hole and wide-angle uphole become possibility.
To achieve the above object, the present invention uses following technical scheme：
The present invention is a kind of pneumatic propelling unit of the tree-shaped drilling of underground coal mine, mainly includes propulsion plant frame, synchronization
Belt wheel（Including driving pulley and driven pulley）, compress belt wheel, special-shaped synchronous cog belt, the air motor with reductor, slow down
Machine output shaft, follower shaft, compression wheel shaft, compressor arm, spring, spring cup, wing nut, conduit saddle mechanism, dust cover and phase
The link mechanism answered such as bolt（Screw）, nut, pad, pivot pin etc..
The present invention is symmetrical arranged a pair of belt wheels in the upper and lower both sides of high-pressure resin pipe, and downside is drive pulley, and upside is compression
Belt wheel, is cased with identical abnormal shape synchronous cog belt on each side belt wheel, institute is fully contacted by cog belt and high-pressure resin pipe
The frictional force of generation provides propulsive force, specifically：
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 driven pulley, is connected by special-shaped synchronous cog belt between two belt wheels, and the outer surface of special-shaped synchronous cog belt has and high pressure
The U-lag of pitch tube external diameter matching.Belt wheel is compressed for a pair to be arranged in frame by compressing wheel shaft, it is just right up and down with synchronous pulley
Coordinate, connected by another special-shaped synchronous cog belt between two compression belt wheels, by special-shaped synchronous cog belt and high-pressure resin
Frictional force produced by being fully contacted of pipe provides propulsive force, so as to realize conveying and take-up to high-pressure resin pipe.
The compression belt wheel on high-pressure resin pipe top of the invention is adjustable up and down, by adjusting wing nut holddown spring
To realize that top compresses moving down for belt wheel, so as to realize the compression to high-pressure resin pipe.Concrete structure is to compress the one of wheel shaft
End, spring and spring cup are enclosed within compressor arm, and wing nut is screwed into compressor arm upper end tight against spring cup, lower spring end pressure
On wheel shaft is compressed, by adjusting the spring-compressed that wing nut can make on compressor arm, realize that compress belt wheel is adjusted up and down.This
Planting hold-down mechanism has certain elasticity, can be worked under poor environment.
Propulsion plant of the invention install foremost is a conduit saddle mechanism, realized by adjusting the angle of stock by
High-pressure resin pipe is smoothly sent into the drilling at diverse location and inclination angle.Conduit saddle mechanism has regulation stock, regulation stock lower end
Be arranged in frame by pivot pin, can carry out the rotation of different angles around pivot pin, and in frame centered on pivot pin identical
Multiple adjustment holes are set on radius, and regulation stock is provided with a regulation location hole, regulation location hole respectively with each adjustment hole
After corresponding to and being connected, the angular adjustment of regulation stock is realized, this is adjusted for the first order；Adjust the upper end regulation spiral shell of stock
Bolt secures a guide rail, and guide rail is " T " font, and a hole is respectively opened so that guide wheel shaft passes through in two ends；With reeded nylon
Directive wheel installs one side of guide wheel shaft, is space that high-voltage tube passes through between two directive wheels；Guide wheel shaft two ends pass through pad
Fixed with split pin, and respectively covered an extension spring to keep the balance of overall guide wheel shaft and directive wheel at two ends；Regulation
The whole upper end of stock can by regulating bolt make guide rail around bolt rotate, be easy to by high-voltage tube smooth feeding hole in, from
And avoid high-voltage tube port wall turn it is too urgent cause resistance excessive, this be the second level regulation.Whole deposit mechanism passes through first
Level regulation regulation stock and second level regulation guide rail realize carrying out high-pressure resin pipe the guiding of different angles, so as to by high pressure
Pitch tube is smoothly sent into the drilling at diverse location and inclination angle.
Aluminium alloy sheet dust cover is installed in the outside of whole propulsion plant, covers whole propulsion plant, can effectively be subtracted
The entrance of the impurity such as few dust, improves the service life of mechanism, also can guarantee that the safety of operating personnel.
The present invention provides power using the air motor with explosion-proof performance, and the air motor with reductor is generally piston
Formula, with explosion prevention function, moment of torsion is big, small volume, light weight, can realize rotating by changing airintake direction, and by regulation
Air inflow realizes stepless time adjustment.
Special-shaped synchronous cog belt of the invention is made using long lifespan and coefficient of friction composite higher, thereon
Face carries U-shaped groove, and the contact area with high-pressure resin pipe is big, and the damage to high-pressure resin pipe is small.
Operation principle of the invention is：
Power is provided using air motor, drives driving pulley to rotate, rotating can be realized by changing airintake direction, institute
Thrust can not only be provided to high-pressure resin pipe in drilling with the present invention, and flexible pipe can also be received after drilling is finished
Line.High-pressure resin pipe bottom is a pair of driving pulleys and driven pulley, when air motor drives master gear to rotate, driven gear
Also can be rotated in the presence of special-shaped synchronization tooth bar, due between special-shaped synchronous cog belt symmetrical above and below and high-pressure resin pipe
There is frictional force, promote high-pressure resin pipe to push ahead.Due to the difference of lithology, rate of penetration will be different, fltting speed
Can be different, velocity of rotation can be adjusted by adjusting the air inflow of air motor, so as to meet fltting speed not in the same time
Requirement.During practice of construction, position, angle of inclination between drilling be it is different, can be by adjusting propulsion plant
The angle of conduit saddle mechanism stock and the angle of guide rail of front end realize that two-stage is adjusted, and the entrance for enabling high-pressure resin pipe to smooth is different
In the drilling of type.
The present invention is designed compared with existing Push Technology, mainly with advantages below：
1. this propulsion plant is coordinated using synchronous pulley and special-shaped synchronous cog belt, is compressed by hold-down mechanism, can be provided
Larger, and stable frictional force, it is suitably for high-pressure resin tubing pipeline and thrust is provided.
2. this propulsion plant provides frictional force using the special-shaped synchronous cog belt that composite is made, and coefficient of friction is big, carries
Big for frictional force, long service life can effectively reduce the local damage to pipeline.
3. the hold-down mechanism simple structure that this propulsion plant is used, can be with by wing nut, compressor arm and spring members
Enough elastic compression power is obtained, is conducive to propulsion plant to be worked under bad environment.This propulsion plant devises pipeline supporting
Guiding mechanism is lifted, is adjusted using two-stage, conveying high-pressure tree can be adjusted according to position, the difference at angle of inclination between drilling
The angle and height of fat pipe, in the different types of drilling of entrance for enabling high-pressure resin pipe to smooth.During self-propelled drilling,
If depending entering to push certainly into being difficult to drill deep and long hole for self-feeding bit alone.So being carried out to pipeline by this propulsive mechanism
Entering power certainly and can just get out medium-length hole in conjunction with self-feeding bit is advanced, the drilling of wide-angle uphole can be also realized.
4. this propulsion plant provides power using air motor, has explosion-proof performance in underground coal mine, and rotating speed is relatively slow,
Moment of torsion is big, can rotating and stepless time adjustment, the conveying and take-up of high-voltage tube can be realized, and overall dimensions are small, light weight.
5. this propulsion plant, can directly using the compressed air of the existing laying in underground due to providing power using air motor
Pipeline as power source, without separately setting single power set.
It can be seen that, the frictional force for compared with existing Push Technology, being provided of the invention is big, and the local damage to pipeline is small, machine
Structure has explosion prevention function, can realize the conveying and take-up of high-pressure resin pipe, can also carry out stepless time adjustment, and simple structure, chi
It is very little smaller, light weight, long service life, conveying to high-pressure resin pipe when can efficiently accomplish waterpower drilling medium-length hole.
Brief description of the drawings
Fig. 1 is the front view of this propulsion plant（Without dust cover）；
Fig. 2 is A-A profiles of this propulsion plant；
Fig. 3 is B-B profiles of this propulsion plant；
Fig. 4 a and Fig. 4 b are the front view and left view of this propulsion plant frame；
Fig. 5 a and Fig. 5 b are the top view and axial symmetry profile that this propulsion plant compresses wheel shaft；
Fig. 6 a and Fig. 6 b are the regulation stock lower end and the profile of regulation location hole junction of this propulsion plant；
Fig. 7 a and Fig. 7 b are the front elevation and A-A profiles of this propulsion plant conduit saddle mechanism.
Drawing reference numeral explanation：
1st, frame, 2, special-shaped synchronous cog belt, 3, synchronous pulley, 4, sunk screw, 5, axle end baffle plate, 6, contact roller
Axle, 7, compress belt wheel, 8, compressor arm, 9, spring, 10, spring cup, 11, wing nut, 12, conduit saddle mechanism, 13, driven pulley
Axle, 14, round nut, 15, bearing pin（Split pin, pivot pin etc.）, 16, plain cushion, 17, bolt and and its nut, 18, reductor output
Axle, 19, the air motor with reductor, 20, fillister head screw, 21, dust cover, 22, guide rail, 23, guide wheel shaft, 24, draw
Stretch spring, 25, directive wheel, 26, regulation stock, 27, regulation location hole, 28, pad and split pin.
Specific embodiment
The specific embodiment to this propulsion plant is described further below in conjunction with the accompanying drawings：
As shown in Figures 1 to 3, the present invention relates to a kind of propulsion plant suitable for the tree-shaped drilling of underground coal mine, high-pressure resin
Manage upper and lower both sides and be respectively symmetrical arranged a pair of belt wheels, downside is synchronous pulley（3）, including driving pulley and driven pulley, upside is
Compress belt wheel（7）, it is installed in frame（1）On（Rack construction is shown in Fig. 4 a and Fig. 4 b）.Driving pulley passes through speed reducer output shaft
（18）With the air motor with reductor（19）It is connected, the abnormal shape with U-shaped groove is cased between driving pulley and driven pulley same
Step cog belt（2）, work as air motor（19）When driving driving pulley to rotate, driven pulley will be in special-shaped synchronous cog belt（2）'s
Rotated together under effect.Air motor used（19）Use piston type pneumatic motor, rotating speed is relatively slow more, but the torsion for providing
Square is big, and can adjust rotating speed by adjusting air inflow, so as to match from different rate of penetrations not in the same time.
Compress belt wheel（7）Compressor arm（8）It is a top for cylinder bottom is cubical rod member, and Upper cylindrical band
There is screw thread, its size and wing nut（11）Supporting, the cross section of lower cube is square, its size and compression wheel shaft
（6）It is supporting.
As shown in figure 5 a and 5b, wheel shaft is compressed（6）The left side be cylindrical drive shaft, the right is hollow cube, its chi
It is very little that it can be made just to be enclosed within compressor arm（8）On lower cube, so as to realize moving up and down for contact roller.
As shown in figure 3, whole compressor arm（8）It is welded to the frame of propulsion plant（1）On.Compress wheel shaft（6）Upper peace
Dress compresses belt wheel（7）, two compress belt wheel（7）Between be cased with identical abnormal shape synchronous cog belt（2）.By tightening compressor arm（8）On
Wing nut（11）Carry out holddown spring lid（10）And spring（9）, so as to promote compression belt wheel（7）Move down, complete to high pressure
The compression of pitch tube, realizes the offer of frictional force.This compression mode has certain elasticity, can be worked under bad environment.
As shown in figure 1, propulsion plant front end is a conduit saddle mechanism（12）, its details is as shown in figs. 7 a and 7b.It is by adjusting
Section stock（26）, nylon directive wheel（25）, guide rail（22）, extension spring（24）And other link members composition.
As shown in Figure 6 a, stock is adjusted（26）Lower end passes through pivot pin（15）Installed in frame（1）On, can be carried out not around pivot pin
With the rotation of angle, and multiple adjustment holes are set centered on pivot pin in frame in same radius, regulation stock is provided with
One regulation location hole（27）, regulation location hole is corresponding with each adjustment hole respectively and by plain cushion（16）, bolt and and its spiral shell
It is female（17）The angle of a certain needs is fixed on, as shown in Figure 6 b, the angular adjustment of regulation stock is realized, first order regulation is formed,
This is first order regulation.Regulation stock（26）Upper end bolt secure a guide rail（22）, guide rail（22）It is " T " font,
A hole is respectively opened so as to guide wheel shaft in two ends（23）Pass through；With reeded nylon directive wheel（25）String is in guide wheel shaft（23）'s
On one side, two directive wheel（25）Between the space that passes through for high-pressure resin pipe.Guide wheel shaft（23）Two ends pass through pad and split pin
（28）It is fixed, and respectively covered an extension spring at two ends（24）To keep overall guide wheel shaft（23）And directive wheel（25）It is flat
Weighing apparatus；Regulation stock（26）Whole front end it can be made with guide rail by regulating bolt（22）Rotated around bolt, be easy to height
In the smooth feeding hole of pressure pipe, so as to avoid high-voltage tube port wall turn it is too urgent cause resistance excessive, this is second level regulation.
Whole deposit mechanism is by first order regulation stock（26）Guide rail is adjusted with the second level（22）To realize high-pressure resin pipe
Smoothly in the drilling at feeding diverse location and inclination angle.
Additionally, whole propulsion plant aluminium alloy sheet dust cover（21）Protection, can effectively reduce the entrance of dust, carry
The propulsion effect and service life of mechanism high, it is ensured that the safety of operating personnel.
Schematical specific 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 (3)
1. the pneumatic propelling unit of the tree-shaped drilling of a kind of underground coal mine, it is characterised in that：Including frame (1), synchronous pulley (3),
Compress belt wheel (7), special-shaped synchronous cog belt (2), the air motor (19) with reductor, speed reducer output shaft (18), driven pulley
Axle (13), compress wheel shaft (6), compressor arm (8), spring (9), wing nut (11), conduit saddle mechanism (12), dust cover (21) and
Corresponding link member；
In frame (1), one is driving wheel, the speed reducer output shaft with air motor (19) to a pair of synchronous pulleys (3)
(18) connect, another is driven pulley, connected by special-shaped synchronous cog belt (2) between two belt wheels, special-shaped synchronous cog belt
There is the U-lag matched with high-pressure resin pipe external diameter outer surface；
Belt wheel (7) is compressed for a pair by compressing wheel shaft (6) in frame (1), with synchronous pulley (3) up and down just to coordinating,
Connected by another special-shaped synchronous cog belt (2) between two compressions belt wheel (7), by special-shaped synchronous cog belt (2) and high pressure
Frictional force produced by being fully contacted of pitch tube provides propulsive force, so as to realize the compression to high-pressure resin pipe；
One end, spring (9) and the spring cup (10) for compressing wheel shaft (6) are enclosed within compressor arm (8), and wing nut is screwed into pressure
Tight against spring cup (10), spring (9) lower end is pressed in compression wheel shaft (6), can by adjusting wing nut (11) for tight bar (8) upper end
So that spring (9) compression on compressor arm (8), realizes that compress belt wheel (7) is adjusted up and down；
Installed in whole propulsion plant foremost, it has regulation stock (26), under regulation stock (26) for conduit saddle mechanism (12)
End is arranged in frame (1) by pivot pin, the rotation of different angles can be carried out around pivot pin (15), and is with pivot pin in frame
The heart sets multiple adjustment holes in same radius, and regulation stock is provided with regulation location hole (27), regulation location hole difference
It is corresponding with each adjustment hole and after being connected, the angular adjustment of regulation stock is realized, form first order regulation；Regulation stock
(26) upper end regulating bolt fixes " T " font guide rail (22), and guide rail (22) can be around regulation stock by regulating bolt
(26) upper end rotates, and forms two grades of regulations；A hole is respectively opened so that guide wheel shaft (23) passes through in guide rail (22) two ends, guide wheel shaft
(23) it is each on to install one with reeded directive wheel (25), it is space that high-pressure resin pipe passes through between two directive wheels (25)；
Guide wheel shaft (23) two ends are fixed by pad and split pin (28), and respectively covered an extension spring (24) to keep at two ends
Overall guide wheel shaft (23) and the balance of directive wheel (25).
2. the pneumatic propelling unit of the tree-shaped drilling of underground coal mine according to claim 1, it is characterised in that：The band slows down
The air motor (19) of machine is piston type starter motor.
3. the pneumatic propelling unit of the tree-shaped drilling of underground coal mine according to claim 1, it is characterised in that whole propulsion dress
The outside put is installed by aluminium alloy sheet dust cover (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510579878.XA CN105134076B (en) | 2015-09-11 | 2015-09-11 | The pneumatic propelling unit of the tree-shaped drilling of underground coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510579878.XA CN105134076B (en) | 2015-09-11 | 2015-09-11 | The pneumatic propelling unit of the tree-shaped drilling of underground coal mine |
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| Publication Number | Publication Date |
|---|---|
| CN105134076A CN105134076A (en) | 2015-12-09 |
| CN105134076B true CN105134076B (en) | 2017-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510579878.XA Active CN105134076B (en) | 2015-09-11 | 2015-09-11 | The pneumatic propelling unit of the tree-shaped drilling of underground coal mine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3856096A (en) * | 1973-11-09 | 1974-12-24 | E Williams | Drill string and drill collar therefor |
| US3881561A (en) * | 1974-02-25 | 1975-05-06 | Shell Oil Co | Rotary bit for hydraulically drilling holes into underground formations |
| US4129335A (en) * | 1975-09-19 | 1978-12-12 | Atlas Copco Aktiebolag | Fluid jet method and device for breaking hard material |
| CN1443920A (en) * | 2003-04-18 | 2003-09-24 | 太原理工大学 | Directional drilling machine with continuous propelling wate jet flow |
| CN1558084A (en) * | 2004-02-09 | 2004-12-29 | 太原理工大学 | Strong force propulsion plant of continuous tube |
| CN202926213U (en) * | 2012-11-27 | 2013-05-08 | 河南宇建矿业技术有限公司 | Pipe conveyer for mining hydraulic working machine |
-
2015
- 2015-09-11 CN CN201510579878.XA patent/CN105134076B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3856096A (en) * | 1973-11-09 | 1974-12-24 | E Williams | Drill string and drill collar therefor |
| US3881561A (en) * | 1974-02-25 | 1975-05-06 | Shell Oil Co | Rotary bit for hydraulically drilling holes into underground formations |
| US4129335A (en) * | 1975-09-19 | 1978-12-12 | Atlas Copco Aktiebolag | Fluid jet method and device for breaking hard material |
| CN1443920A (en) * | 2003-04-18 | 2003-09-24 | 太原理工大学 | Directional drilling machine with continuous propelling wate jet flow |
| CN1558084A (en) * | 2004-02-09 | 2004-12-29 | 太原理工大学 | Strong force propulsion plant of continuous tube |
| CN202926213U (en) * | 2012-11-27 | 2013-05-08 | 河南宇建矿业技术有限公司 | Pipe conveyer for mining hydraulic working machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105134076A (en) | 2015-12-09 |
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