CN110374602A - A kind of end side brill formula coalcutter unilateral side recovery device - Google Patents
A kind of end side brill formula coalcutter unilateral side recovery device Download PDFInfo
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- CN110374602A CN110374602A CN201910678394.9A CN201910678394A CN110374602A CN 110374602 A CN110374602 A CN 110374602A CN 201910678394 A CN201910678394 A CN 201910678394A CN 110374602 A CN110374602 A CN 110374602A
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- hydraulic cylinder
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- 241001074085 Scophthalmus aquosus Species 0.000 title claims abstract description 34
- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 93
- 239000003245 coal Substances 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 16
- 239000002828 fuel tank Substances 0.000 claims description 12
- 239000010720 hydraulic oil Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000011295 pitch Substances 0.000 claims description 8
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 238000005065 mining Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 230000006870 function Effects 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 230000008450 motivation Effects 0.000 abstract description 2
- 230000033001 locomotion Effects 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C47/00—Machines for obtaining or the removal of materials in open-pit mines
- E21C47/02—Machines for obtaining or the removal of materials in open-pit mines for coal, brown coal, or the like
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of ends to help brill formula coalcutter unilateral side recovery device, including drilling tool, the drilling rod being connect by retarder with drilling tool, the power that coalcutter provides is transmitted to drilling tool by retarder by the drilling rod, while the coal charge of drilling tool back production being transported to outside coal seam；It is connected with closed universal joint between retarder and drilling rod, transmits the direction of power to retarder for changing the drilling rod；One end of retarder is equipped with hydraulic-driven and fastening system, for pushing retarder and drilling tool to deviate and locking the position of the retarder and drilling tool.The present invention utilizes driving and the locking function of hydraulic drive and fastening system, so that drilling tool is shifted and is fixed, it recycles the motivation of adjustment direction of closed universal joint and is stably connected with effect, so that power transmission continues to keep continuity in drilling tool migration process, during high wall mining machine moves back brill, drilling tool offset back production, less idle work during moving back brill may be implemented, the efficiency of exploitation is greatly improved, mining time is saved.
Description
Technical field
The invention belongs to the technical fields of hydraulic system driving device more particularly to a kind of end side brill formula coalcutter unilateral side to return
Device for picking.
Background technique
Status of the exploitation of open coal mine in coal production is quite important, and the exploitation of end side coal is Opencut coal mine mining
Important mining method；Since mechanical use of different open coal mines has the respective scope of application and particularity.Brill formula is mined
Machine drill tool enters seam mining, then by the mode of drilling tool distancing coal output layer, wastes the working time of working seam, reduce coal mining
Working efficiency.Due to the restriction by various orographic conditions, drilling tool pierces coal seam again, may need more workloads, is opening
During adopting, there is the performance of recycling coal effect difference.In many cases, since drilling tool pierces coal seam, coal seam is changed
The mine pressure of structure, entire coal seam is changed, and the original rock-steady structure in coal seam is destroyed, and is caused in exploitation again, labour
Intensity is excessive, side exploitation continuity in end reduces, security risk increases, and causes the adverse effect in recovery process.
Therefore, the direction how drilling tool pierced in coal seam is changed to traveling is realized the stable back production in the exploitation of end side, is increased
The continuity for moving back drill-through journey is added to become the important research target of research end side coal high-efficiency mining.
Summary of the invention
Based on the above the deficiencies in the prior art, technical problem solved by the invention is that providing a kind of end side brill formula mines
Machine unilateral side recovery device, may be implemented drilling tool offset back production prearranged pillar, and less idle work during moving back brill substantially increases brill
The efficiency of formula coalcutter back production.
In order to solve the above-mentioned technical problem, the present invention is achieved through the following technical solutions: the present invention provides a kind of end side
Brill formula coalcutter unilateral side recovery device, including drilling tool, the drilling rod being connect by retarder with the drilling tool, the drilling rod will mine
The power that machine provides is transmitted to drilling tool by retarder, while the coal charge of drilling tool back production being transported to outside coal seam；
Closed universal joint is connected between the retarder and drilling rod, it is dynamic to retarder transmitting for changing the drilling rod
The direction of power；
One end of the retarder is equipped with hydraulic-driven and fastening system, for pushing the retarder and drilling tool to deviate simultaneously
Lock the position of the retarder and drilling tool.
Further, the hydraulic-driven and fastening system include hydraulic pump, solenoid directional control valve, hydraulic cylinder；
The hydraulic pump is connected with the solenoid directional control valve, for being supplied by the solenoid directional control valve into the hydraulic cylinder
Oil；
The solenoid directional control valve is connected with the hydraulic cylinder, the direction of motion of the telescopic rod for controlling hydraulic cylinder.
Further, it is additionally provided with bidirectional hydraulic lock between the solenoid directional control valve and hydraulic cylinder, for guaranteeing hydraulic-driven
When stopping working with fastening system, the position of hydraulic cylinder is locked.
In one embodiment of the invention, it is also connected with motor on the hydraulic pump, for for the hydraulic pump
Work provides power；
The hydraulic pump is connect by oil pipe with fuel tank, for passing through the oil suction from the fuel tank and supplying described hydraulic
Cylinder.
Specifically, the solenoid directional control valve is three position four-way directional control valve, and the left position in the three position four-way directional control valve connects
When logical, the hydraulic oil of the hydraulic pump enters from the rodless cavity body of the hydraulic cylinder, and goes out from the rod chamber body of hydraulic cylinder；
When location right in the three position four-way directional control valve is connected, hydraulic oil the having from the hydraulic cylinder of the hydraulic pump
Rod cavity body enters, and goes out from the rodless cavity body of hydraulic cylinder.
Preferably, the closed universal joint includes and the active fork of drilling rod coaxial arrangement and the retarder
The slave moving fork of main shaft coaxial arrangement, the centering ball positioned at active fork and from center between moving fork and encirclement institute
The transmission steel ball of centering ball setting is stated, power is transmitted to the active fork from the drilling rod, then is pitched by the active by passing
Dynamic steel ball is transmitted to described from moving fork, passes to the retarder from moving fork through described, most passes to brill through retarder adjustment afterwards
Tool.
By upper, side brill formula coalcutter unilateral side recovery device in end of the invention is a kind of application apparatus of high-efficiency mining, is utilized
The driving of hydraulic drive and fastening system and locking function recycle closed universal joint so that drilling tool is shifted and fixed
Motivation of adjustment direction and be stably connected with effect so that in drilling tool migration process power transmission continue holding continuity.The present invention
Increase hydraulic system to be equivalent to can control angle and the position of drilling tool offset, increases envelope between drilling rod and the main shaft of retarder
Enclosed universal joint, being equivalent to makes to transmit the change that direction occurs for power, and drilling tool can normally shift, and closed mechanism avoids
Coal charge enters the influence for wherein causing transmission.During high wall mining machine moves back brill, drilling tool offset back production may be implemented,
Less idle work during moving back brill, greatly improves the efficiency of exploitation, saves mining time.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, below in conjunction with preferred embodiment, and cooperates attached drawing, detailed description are as follows.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, the attached drawing to embodiment is simply situated between below
It continues.
Fig. 1 is that the drilling tool of the end side brill formula coalcutter unilateral side recovery device of the preferred embodiment of the present invention pierces working drawing；
Fig. 2 is that the drilling tool of the end side brill formula coalcutter unilateral side recovery device of the preferred embodiment of the present invention withdraws working drawing；
Fig. 3 is the hydraulic-driven and fastening system of the end side brill formula coalcutter unilateral side recovery device of the preferred embodiment of the present invention
Schematic diagram；
Fig. 4 is the structure of the closed universal joint of the end side brill formula coalcutter unilateral side recovery device of the preferred embodiment of the present invention
Schematic diagram.
In figure: 1, drilling tool；2, retarder；3, drilling rod；4, hydraulic-driven and fastening system；4-1, motor；It is 4-2, hydraulic
Pump；4-3, oil pipe；4-4, solenoid directional control valve；4-5, bidirectional hydraulic lock；4-6, hydraulic cylinder；4-7, overflow valve；4-8, fuel tank；5, it seals
Enclosed universal joint；5-1, it actively pitches；5-2, from moving fork；5-3, lock pin；5-4, positioning pin；5-5, centering ball；5-6, transmission
Steel ball；6, ventilation shaft；7, prearranged pillar.
Specific embodiment
The embodiment of the invention will now be described in detail with reference to the accompanying drawings, and as part of this specification passes through
Embodiment illustrates the principle of the present invention, and other aspects of the present invention, feature and its advantage will become by the detailed description
It is very clear.In the attached drawing of institute's reference, the same or similar component is indicated using identical drawing reference numeral in different figures.
As shown in Figs 1-4, side brill formula coalcutter unilateral side recovery device in end of the invention includes drilling tool 1, retarder 2, drilling rod
3, hydraulic-driven and fastening system 4 and closed universal joint 5；Wherein hydraulic-driven and fastening system 4 are mounted on ventilation shaft 6
In, the ventilation shaft 6 is synchronous with the position of drilling rod 3, and effect is to keep ventilation state when boring the work of formula coalcutter, guarantees
The operating air pressure exploited in exploitation process is normal.Hydraulic-driven and fastening system 4 include: motor 4-1, hydraulic pump 4-2, oil pipe
4-3, solenoid directional control valve 4-4, bidirectional hydraulic lock 4-5, hydraulic cylinder 4-6, overflow valve 4-7, fuel tank 4-8；Closed universal joint 5 wraps
Include: actively pitch 5-1, from moving fork 5-2, lock pin 5-3, positioning pin 5-4, centering ball 5-5, transmission steel ball 5-6, the centering steel
Ball 5-5 be located at it is described actively pitch 5-1 and from center between moving fork 5-2, the transmission steel ball 5-6 encirclement centering ball
5-5 setting will actively pitch 5-1, centering ball 5-5 by lock pin 5-3 and positioning pin 5-4, be driven steel ball 5-6 and from moving fork 5-
2 connect.The back production object of end side of the invention brill formula coalcutter is prearranged pillar 7, and prearranged pillar 7 is according to the structure in coal seam
It is required that being designed, effect is the structure of regular coal seam, improves safety in recovery process.
Concrete model, design parameter of drilling tool 1 of the invention etc. are selected according to actual condition, adapt to coal seam knot
Structure, efficiently can smoothly exploit and back production, drilling tool 1 are connected with retarder 2, being capable of smooth back production prearranged pillar 7.The deceleration
Concrete model, design parameter of device 2 etc. are selected according to actual condition, and retarder 2 is connect with closed universal joint 5, will be sealed
The received power of enclosed universal joint 5 passes to drilling tool 1.Drilling rod 3 is connected with closed universal joint 5, and effect provides coalcutter
Power is transmitted to drilling tool 1, while will be outside the coal charge smooth delivery of power to coal seam of 1 back production of drilling tool.
Specifically, motor 4-1 of the invention is connected with hydraulic pump 4-2, motor 4-1 is hydraulic pump 4-2 oil suction work
Power is provided, is the major impetus source of hydraulic-driven Yu fastening system 4.The hydraulic pump 4-2 passes through oil pipe 4-3 and fuel tank 4-
8 are connected, and the needs such as concrete model, parameter are selected according to hydraulic system, and hydraulic pump 4-2 itself passes through the oil suction from fuel tank 4-8
Hydraulic cylinder 4-6 is supplied, is the dynamical element of hydraulic-driven Yu fastening system 4, converts liquid for the motor 4-1 mechanical energy provided
The movement of the telescopic rod of cylinder pressure 4-6.
Solenoid directional control valve 4-4 of the invention is connected with hydraulic pump 4-2, and solenoid directional control valve 4-4 of the invention preferentially selects three
Position and four-way reversing valve, solenoid directional control valve 4-4 control the direction of motion of the telescopic rod of hydraulic cylinder 4-6, for control hydraulic-driven and lock
The control element that hydraulic oil flows in clamping system 4.When left position in the three position four-way directional control valve is connected, the hydraulic pump 4-
2 hydraulic oil enters from the rodless cavity body of the hydraulic cylinder 4-6, and goes out from the rod chamber body of hydraulic cylinder 4-6, pushes hydraulic cylinder 4-
6 telescopic rod does elongation movement；When location right in the three position four-way directional control valve is connected, the hydraulic oil of the hydraulic pump 4-2
Enter from the rod chamber body of the hydraulic cylinder 4-6, and go out from the rodless cavity body of hydraulic cylinder 4-6, pushes the telescopic rod of hydraulic cylinder 4-6
Do retracting action.
Bidirectional hydraulic lock 4-5 of the invention is mounted between solenoid directional control valve 4-4 and hydraulic cylinder 4-6, and effect is locking
Hydraulic cylinder 4-6 guarantees that the pressure in hydraulic cylinder 4-6 is stablized, when guaranteeing that hydraulic-driven and fastening system 4 stop working, locks liquid
The position of cylinder pressure 4-6.The telescopic rod of the hydraulic cylinder 4-6 is extended due to the fuel feeding by hydraulic pump 4-2, pushes retarder 2
It is deviated with drill bit 1, hydraulic oil returns in fuel tank 4-8 through oil pipe again, and hydraulic cylinder 4-6 is hydraulic-driven and holding in fastening system 4
Units can be converted into input liquid pressure the mechanical energy for pushing retarder 2 to deviate.
Overflow valve 4-7 of the invention is installed between hydraulic pump 4-2 and fuel tank 4-8, effect be protection hydraulic-driven with
The safety of fastening system 4 maintains the balance of hydraulic system.The effect of the fuel tank 4-8 is the hydraulic oil stored in hydraulic system.
In addition, closed universal joint 5 of the invention actively pitch 5-1 and drilling rod 3 is coaxial, from moving fork 5-2 and retarder 1
Main shaft it is coaxial, the power that drilling rod 3 provides then is transmitted to the master of retarder 2 after closed 5 structure of universal joint changes direction
In axis.
End side of the invention brill formula coalcutter exploitation process starts, start the hydraulic-driven that is installed in ventilation shaft 6 with
The motor 4-1 of fastening system 4, motor 4-1 provide power to hydraulic pump 4-2, and solenoid directional control valve 4-4 is moved to left, hydraulic pump 4-2
The oil suction from fuel tank 4-8, hydraulic oil enter in hydraulic cylinder 4-6 by oil pipe and solenoid directional control valve 4-4, retarder 2 and drilling tool 1
Position is fixed, and the telescopic rod of hydraulic cylinder 4-6 is connected with retarder 2, and the telescopic rod of hydraulic cylinder 4-6 pushes retarder 2 and drilling tool 1
Offset；Meanwhile the power that drilling rod 3 provides is transmitted in retarder 2 through closed universal joint 5, power is passed to by retarder 2 again
Drilling tool 1, the power that promotion and retarder 2 of the drilling tool 1 due to hydraulic-driven with fastening system 4 provide do offset movement and do simultaneously
Rotary motion carries out back production to the prearranged pillar 7 in coal seam.When the arrival of drilling tool 1 specifies Offsets angle, stop motor 4-1
Power is provided to hydraulic pump 4-2, the fuel feeding work of hydraulic pump 4-2 is closed, adjusts solenoid directional control valve 4-4 to middle position, and lead to
The locking effect for crossing bidirectional hydraulic lock 4-5 keeps hydraulic cylinder 4-6 fixed, the location of fixed drilling tool 1；Brill formula coalcutter moves back
Drill-through journey starts, and due to the offset of drilling tool 1, drilling tool 1 is rotated to carry out simultaneously with offset movement, realizes the back production of brill formula coalcutter
Move back drill-through journey.Back production is moved back drill-through journey and is finished, and opens motor 4-1 switch, solenoid directional control valve 4-4 is moved to right, and hydraulic oil flow direction changes
Become, shrink the telescopic rod of hydraulic cylinder 4-6, after resetting drilling tool 1 and retarder 2, closes the operation of recovery device.
In the following, referring to Fig.1~Fig. 4 and combination above structure description, help the unilateral side back production of brill formula coalcutter to end of the invention
The working principle of device is described:
Motor 4-1 provides the power of pump oil for hydraulic pump 4-2 in hydraulic-driven and fastening system 4, and hydraulic pump 4-2 is from oil
Oil suction in case 4-8, solenoid directional control valve 4-4 are opened, and are conveyed to hydraulic cylinder 4-6, hydraulic cylinder 4- by oil pipe and bidirectional hydraulic lock 4-5
6 telescopic rod elongation pushes retarder 2 and drilling tool 1 to deviate；The power that drilling rod 3 provides is transmitted to deceleration through closed universal joint 5
In device 2, closed universal joint 5 actively pitch 5-1 and drilling rod 3 is coaxial, the slave moving fork 5-2 of closed universal joint 5 and retarder 2
Main shaft is coaxial, and power is transmitted to from drilling rod 3 and actively pitches 5-1, then is transmitted to by transmission steel ball 5-6 from moving fork by actively pitching 5-1
5-2 most passes to drilling tool 1 through the adjustment of retarder 2 afterwards through passing to retarder 2 from moving fork 5-2；When drilling tool 1 and retarder 2 reach
When to specified angle, change the position of solenoid directional control valve 4-4 at this time, hydraulic cylinder 4-6 made be in locking state, lock drilling tool 1 and
The position of retarder 2.Start as coalcutter moves back drill-through journey, drilling tool 1 deviates back production prearranged pillar 7, and back production coal charge is defeated with drilling rod 3
It is sent on the outside of coal seam.
Brill formula coalcutter unilateral side recovery device is helped at end in the present invention, as the main coal recovery dress in the back production of end side
It sets, the single fixation and drilling tool 1 for having taken leave of previous drilling tool 1, retarder 2 and drilling rod 3 cannot deviate smooth back production prearranged pillar 7
The characteristics of, closed universal joint 5 is increased between drilling rod 3 and retarder 2, its effect of closed universal joint 5 can not only will bore
The dynamical stability that bar 3 provides is input in retarder 2, and powerdriven direction is changed, and enables drilling tool 1
Offset；The installation of hydraulic drive and fastening system 4 can not only provide the power that can deviate exploitation prearranged pillar 7 for drilling tool 1,
It also can guarantee the stabilization of 1 position of drilling tool simultaneously.The design of device through the invention, hydraulic drive and fastening system 4 with it is closed
The use of universal joint 5, so that 1 motion stabilization of drilling tool, can reach the deviation angle of brill formula coalcutter need of work, drilling tool 1 is inclined
Shifting stability is good, can cross the operation is stable for keeping retarder 2 and drilling tool 1, slow down biggish impact, greatly promotes end side brill formula and adopts
The efficiency of coal machine back production, is saved the time of exploitation, guarantees the continuity of back production and conveying.
The above is a preferred embodiment of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, it is noted that for those skilled in the art, without departing from the principle of the present invention, may be used also
To make several improvement and variation, these, which improve and change, is also considered as protection scope of the present invention.
Claims (6)
1. brill formula coalcutter unilateral side recovery device is helped at a kind of end, including drilling tool (1), by retarder (2) and the drilling tool (1) even
The drilling rod (3) connect, which is characterized in that the power that coalcutter provides is transmitted to drilling tool by retarder (2) by the drilling rod (3)
(1), it while by the coal charge of drilling tool (1) back production is transported to outside coal seam；
Closed universal joint (5) are connected between the retarder (2) and drilling rod (3), for changing the drilling rod (3) to deceleration
The direction of device (2) transmitting power；
One end of the retarder (2) is equipped with hydraulic-driven and fastening system (4), for pushing the retarder (2) and drilling tool
(1) deviate and lock the position of the retarder (2) and drilling tool (1).
2. end side as described in claim 1 brill formula coalcutter unilateral side recovery device, which is characterized in that the hydraulic-driven and lock
Clamping system (4) includes hydraulic pump (4-2), solenoid directional control valve (4-4), hydraulic cylinder (4-6)；
The hydraulic pump (4-2) is connected with the solenoid directional control valve (4-4), for passing through the solenoid directional control valve (4-4) to institute
State fuel feeding in hydraulic cylinder (4-6)；
The solenoid directional control valve (4-4) is connected with the hydraulic cylinder (4-6), the fortune of the telescopic rod for controlling hydraulic cylinder (4-6)
Dynamic direction.
3. end side as claimed in claim 2 brill formula coalcutter unilateral side recovery device, which is characterized in that the solenoid directional control valve
Bidirectional hydraulic lock (4-5) is additionally provided between (4-4) and hydraulic cylinder (4-6), for guaranteeing that hydraulic-driven and fastening system (4) stop
When work, the position of hydraulic cylinder (4-6) is locked.
4. end side as claimed in claim 2 brill formula coalcutter unilateral side recovery device, which is characterized in that the hydraulic pump (4-2)
On be also connected with motor (4-1), for for the work of the hydraulic pump (4-2) providing power；
The hydraulic pump (4-2) is connect by oil pipe (4-3) with fuel tank (4-8), for passing through the oil suction from the fuel tank (4-8)
And supply the hydraulic cylinder (4-6).
5. as brill formula coalcutter unilateral side recovery device is helped at the described in any item ends of claim 2 to 4, which is characterized in that the electricity
Magnetic reversal valve (4-4) is three position four-way directional control valve, when the left position in the three position four-way directional control valve is connected, the hydraulic pump
The hydraulic oil of (4-2) enters from the rodless cavity body of the hydraulic cylinder (4-6), and goes out from the rod chamber body of hydraulic cylinder (4-6)；
When location right in the three position four-way directional control valve is connected, the hydraulic oil of the hydraulic pump (4-2) is from the hydraulic cylinder (4-
6) rod chamber body enters, and goes out from the rodless cavity body of hydraulic cylinder (4-6).
6. end side as described in claim 1 brill formula coalcutter unilateral side recovery device, which is characterized in that the closed universal joint
It (5) include the active fork (5-1) being coaxially disposed with the drilling rod (3), driven with the main shaft coaxial arrangement of the retarder (2)
It pitches (5-2), be located at active fork (5-1) and centering ball (5-5) and encirclement from center between moving fork (5-2)
The transmission steel ball (5-6) of centering ball (5-5) setting, power are transmitted to the active fork (5-1) from the drilling rod (3),
It is transmitted to by active fork (5-1) by transmission steel ball (5-6) described from moving fork (5-2), is passed through described from moving fork (5-2) again
The retarder (2) are passed, most pass to drilling tool (1) through retarder (2) adjustment afterwards.
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|---|---|---|---|
| CN201910678394.9A CN110374602A (en) | 2019-07-25 | 2019-07-25 | A kind of end side brill formula coalcutter unilateral side recovery device |
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| CN201910678394.9A CN110374602A (en) | 2019-07-25 | 2019-07-25 | A kind of end side brill formula coalcutter unilateral side recovery device |
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|---|---|---|---|---|
| SU208615A1 (en) * | 1967-02-27 | 1976-05-25 | Институт горного дела им.А.А.Скочинского | Executive body of auger drilling machines |
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| CN107178543A (en) * | 2017-07-26 | 2017-09-19 | 国电联合动力技术有限公司 | A kind of wind power generating set impeller locks hydraulic control system |
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Application publication date: 20191025 |