CN106321541B - A kind of electro-hydraulic dual control hydraulic system of truck-mounted drilling rig and method - Google Patents
A kind of electro-hydraulic dual control hydraulic system of truck-mounted drilling rig and method Download PDFInfo
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- CN106321541B CN106321541B CN201610768943.8A CN201610768943A CN106321541B CN 106321541 B CN106321541 B CN 106321541B CN 201610768943 A CN201610768943 A CN 201610768943A CN 106321541 B CN106321541 B CN 106321541B
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- 238000005553 drilling Methods 0.000 title claims abstract description 28
- 230000009977 dual effect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title abstract description 11
- 230000006837 decompression Effects 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
- E21B7/022—Control of the drilling operation; Hydraulic or pneumatic means for activation or operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a kind of electro-hydraulic dual control hydraulic system and method, belong to coal-bed gas exploitation field, and in particular to a kind of electro-hydraulic dual control hydraulic system of truck-mounted drilling rig and method.The present invention can realize that executing agency's speed of service ratio controls by liquor controlled multipath, and depressurizing overflow valve by Hydraulic guide control valve, shuttle valve, electric ratio forms double control-type hydraulic control system, can be achieved manually or automatically to control banked direction control valves hydraulic fluid flow rate.The electro-hydraulic dual control hydraulic control system can be realized manual or automatically controlled, electric control system controls truck-mounted drilling rig executing agency can not only be passed through, it is easy to implement the demand of truck-mounted drilling rig automation and remote control, and when electric-control system breaks down, can conveniently realize it is manually operated, avoid executing agency be stopped and caused by boring accidents or security incident.
Description
Technical field
The present invention relates to a kind of electro-hydraulic dual control hydraulic system and method, belong to coal-bed gas exploitation field, and in particular to a kind of
The electro-hydraulic dual control hydraulic system of truck-mounted drilling rig and method.
Background technology
Truck-mounted drilling rig be mainly used in coal-bed gas exploitation and mine drilling rescue, this require truck-mounted drilling rig have efficiently, can
The features such as leaning on, be safe high.Hydraulic guide control is worked due to that can use compared with low discharge and pressure far distance controlled large-capacity valve,
Control system flexible arrangement is convenient, therefore is used widely in drilling rig hydraulic system design.With electrical-liquid control skill
The development of art, for electro-hydraulic proportional control technology in engineering machinery field more application, this provides ginseng for truck-mounted drilling rig Automated condtrol
Examine.
, also can be very fast even if there is equipment fault due to requiring that it has higher reliability during truck-mounted drilling rig use
Fix a breakdown and prevent drilling accident from bringing about great losses, although electro-hydraulic proportional control technology can realize the automation of truck-mounted drilling rig
Control, but for the overall qualities of overhaul of the equipments personnel and rig personnel require it is higher, equipment break down when maintenance compared with
Difficulty, can not fast recovery equipment normal operation, therefore consider for safety, maintenance are convenient etc., rig major loop control
Make and less use electric-control system.The primary circuits such as truck-mounted drilling rig feed, revolution are more high from reliability, the liquid of system maintenance easy
Pilot control system is pressed, this brings obstacle for the Automated condtrol of truck-mounted drilling rig.Although section hydraulic system support manufacturer releases
Manually with electric ratio dual control hydraulic multitandem valve, but because truck-mounted drilling rig big flow banked direction control valves is generally disposed on chassis of vehicle body,
Distant with console, when electric-control system breaks down, manually operated banked direction control valves is extremely inconvenient, and is difficult to observe each execution
Mechanism working condition.
The content of the invention
Contradictory problems between high reliability and Operation and Maintenance convenience of the present invention mainly present in solution prior art,
Provide a kind of electro-hydraulic dual control hydraulic system of truck-mounted drilling rig and method.The system and method has safe and reliable property height, efficient etc.
Advantage, and realize by shuttle valve the conversion of automatically controlled and function of hydraulic control automatically, faster system response, power and energy are convenient rapidly.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
A kind of electro-hydraulic dual control hydraulic system of truck-mounted drilling rig, including：
Shuttle valve, its first input port A are connected with the delivery outlet of Hydraulic guide control valve, its second input port B and electric ratio
The delivery outlet of decompression overflow valve is connected, and its delivery outlet C is connected with the control input mouth of liquor controlled multipath；
Executing agency, it is connected with the delivery outlet of liquor controlled multipath.
Optimization, a kind of electro-hydraulic dual control hydraulic system of above-mentioned truck-mounted drilling rig, the shuttle valve and electric ratio depressurize overflow valve
It is two, wherein：
First input port A of the first shuttle valve is connected with the first delivery outlet A of Hydraulic guide control valve, its second input port B
It is connected with the delivery outlet of the first electric ratio decompression overflow valve；
First input port A of the second shuttle valve is connected with the second delivery outlet B of Hydraulic guide control valve, its second input port B
It is connected with the delivery outlet of the second electric ratio decompression overflow valve；
The delivery outlet of first shuttle valve and the second shuttle valve connects the different control input mouths of liquor controlled multipath respectively.
Optimization, a kind of electro-hydraulic dual control hydraulic system of above-mentioned truck-mounted drilling rig, in addition to：With electric ratio decompression overflow valve,
The connected pressure-reducing valve of Hydraulic guide control valve.
A kind of electro-hydraulic dual control hydraulic control method of truck-mounted drilling rig, including：
Electrical-liquid control step, electric ratio is connected by shuttle valve and depressurizes overflow valve and liquor controlled multipath, is depressurized by electric ratio
Overflow valve controls the action of executing agency by liquor controlled multipath；
Hydraulic guide control step, the first input port of shuttle valve and the second input port are connected into Hydraulic guide control valve respectively
Overflow valve is depressurized with electric ratio, hydraulic control multichannel is passed through by pressure the higher person in Hydraulic guide control valve and electric ratio decompression overflow valve
Valve controls the action of executing agency.
Optimization, a kind of electro-hydraulic dual control hydraulic control method of above-mentioned truck-mounted drilling rig,
In the electrical-liquid control step：After the first electric ratio decompression overflow valve obtains automatically controlled signal, the output of its A mouth
Corresponding control pressure, the C mouths pressure of the first shuttle valve is identical with the A mouth pressure of the first electric ratio decompression overflow valve, the C of the first shuttle valve
Mouthful be connected with the b1 mouths of hydraulic control load sensing multi-way valve, controls hydraulic control load sensing multi-way valve to work in bottom, its valve opening and
The operating pressure of first electric ratio decompression overflow valve is corresponding；
When the second electric ratio decompression overflow valve obtains automatically controlled signal, its A mouth exports corresponding control pressure, now the second shuttle valve
C mouths pressure it is identical with the A mouth pressure of the second electric ratio decompression overflow valve, C mouths and the hydraulic control load-sensitive multichannel of the second shuttle valve
The a1 mouths connection of valve, control hydraulic control load sensing multi-way valve work in upper, its valve opening and the decompression overflow valve work of electric ratio
Pressure is corresponding.
Optimize, a kind of electro-hydraulic dual control hydraulic control method of above-mentioned truck-mounted drilling rig, in Hydraulic guide control step：
When electric ratio decompression overflow valve acts with hydraulic control pilot valve simultaneously, the C mouths operating pressure and electric ratio of shuttle valve subtract
The higher person operating pressure is identical in both pressurized overflow valve and hydraulic control pilot valve；
Wherein, the C mouths of the first shuttle valve are connected with the b1 mouths of hydraulic control load sensing multi-way valve, the C mouths of the second shuttle valve and hydraulic control
The a1 mouths connection of load sensing multi-way valve；Hydraulic control load sensing multi-way valve is controlled upper by the first shuttle valve and the second shuttle valve respectively
Switch between bottom.
Therefore, the invention has the advantages that：Using electro-hydraulic dual control scheme, hydraulic pilot handle and electricity are selected by shuttle valve
Liquid proportional depressurizes overflow valve pressure signal, realizes and Hydraulic guide control and electric-hydraulic proportion pilot control can be achieved, be easy to implement car
Rig is carried to automatically control.When electro-hydraulic proportional control system breaks down, can be realized by operating hydraulic pilot handle to big stream
Measure banked direction control valves control, maintainer, which safeguards, does not influence the normal drilling operation of truck-mounted drilling rig during electric-control system, system have safety,
The advantages that reliability is high, efficient.Realize the conversion of automatically controlled and function of hydraulic control automatically by shuttle valve, faster system response, power and energy is fast
Speed is convenient.
Brief description of the drawings
Fig. 1 is existing Hydraulic guide control systematic schematic diagram；
Fig. 2 is electro-hydraulic proportional control system schematic diagram；
Fig. 3 is electro-hydraulic dual control hydraulic system principle figure in embodiments of the invention；
Fig. 4 is electro-hydraulic dual control hydraulic system principle figure partial enlargement in embodiments of the invention.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
In figure, load sensitive pump 1, hydraulic control load sensing multi-way valve 2, executing agency 3, the first shuttle valve 4, the first electric ratio subtract
Pressurized overflow valve 5, the second electric ratio decompression overflow valve 6, the second shuttle valve 7, Hydraulic guide control valve 8, pressure-reducing valve 9, fuel tank 10.
Embodiment：
Why existing Electric-hydraulic Proportional Load Sensor system is difficult to promote in truck-mounted drilling rig field, and its reason is using electricity
Liquid proportional technology realizes rig groundwork mechanism controls, it is desirable to rig operations and attendant have higher overall qualities,
It will appreciate that electrical equipment and hydraulic system maintenance and safeguard, and system reliability high maintenance is convenient, this is difficult real in production practices
It is existing.
In the specific implementation of the present invention, consideration combines Hydraulic guide control high reliability and easy to maintain and electric-hydraulic proportion
Increasingly automated feature is controlled, using electro-hydraulic double-control system, can realize and automatically controlled quickly and easily switch with Hydraulic guide control.
Below in conjunction with the accompanying drawings with specific embodiment, technical scheme is described in detail.
Referring to Fig. 3, Fig. 3 is that the hydraulic schematic diagram of present example includes load sensitive pump 1, hydraulic control load sensing multi-way valve
2nd, executing agency 3, the first shuttle valve 4, the first electric ratio decompression overflow valve 5, the second electric ratio decompression overflow valve 6, the second shuttle valve 7,
Hydraulic guide control valve 8, pressure-reducing valve 9, fuel tank 10.
Load sensitive pump 1 is hydraulic system high pressure fuel source, and hydraulic control load sensing multi-way valve 2 controls executing agency 3 to act, liquid
The sequence of movement of load sensing multi-way valve 2 is controlled to control by hydraulic control load sensing multi-way valve 2a1, b1 mouth pilot pressure.A1 mouths obtain
Pressure controling signal, hydraulic control load sensing multi-way valve 2 work in upper, and executing agency's positive movement, b1 mouths obtain Stress control
Signal, hydraulic control load sensing multi-way valve 2 are acted when bottom, executing agency's counter motion, a1, b1 mouth no pressure signal, hydraulic control
Load-sensitive valve 2 works in middle position, executing agency's stop motion.
In present example, shuttle valve (4,7) C mouths are connected with hydraulic control load sensing multi-way valve 2a1, b1 mouth, the first shuttle valve 4,
The job order of 7C mouths operating pressure control hydraulic control load sensing multi-way valve 2 and valve amount of opening.
Referring to Fig. 4, Fig. 4 is the electro-hydraulic dual control schematic diagram of present example, and pressure-reducing valve 9 is connected as electro-hydraulic with load sensitive pump
Double-control system provides high pressure fuel source, and when decompression overflow valve 5 obtains automatically controlled signal, its A mouth exports corresponding control pressure, and now first
Shuttle valve 4C mouths pressure is identical with decompression overflow valve 5A mouth pressure.First shuttle valve 4C mouths connect with hydraulic control load sensing multi-way valve 2b1 mouths
Connect, control hydraulic control load sensing multi-way valve 2 works in bottom, and its valve opening is corresponding with the decompression operating pressure of overflow valve 5.When second
Electric ratio decompression overflow valve 6 obtains automatically controlled signal, and its A mouth exports corresponding control pressure, now the second shuttle valve 7C mouths pressure and electricity
Ratio decompression overflow valve 6A mouth pressure is identical.Second shuttle valve 7C mouths are connected with hydraulic control load sensing multi-way valve 2b1 mouths, control hydraulic control
Load sensing multi-way valve 2 works in upper, and its valve opening is corresponding with the second electric ratio decompression operating pressure of overflow valve 6.
When the first electric ratio decompression overflow valve 5,6 can not normal work when, manually operated Hydraulic guide control valve 8 controls hand
Handle, stirring handle makes A mouth pressure output controls, the first shuttle valve 4C mouths operating pressure and Hydraulic guide control valve 8A mouth output pressures
Identical, control hydraulic control load sensing multi-way valve 2 works in bottom, its valve opening and Hydraulic guide control valve 8A mouth output pressures pair
Should；The manually operated joystick of Hydraulic guide control valve 8, stirring handle makes B mouth pressure output controls, the work of the second shuttle valve 7C mouths
Pressure is identical with Hydraulic guide control valve 8B mouth output pressures, controls hydraulic control load sensing multi-way valve 2 to work in upper, its valve is opened
Degree is corresponding with Hydraulic guide control valve 8B mouth output pressures；
In actual applications, electro-hydraulic dual control hydraulic system forms shuttle valve network by shuttle valve 4,7, can automatically select control oil
Source, it can conveniently realize the automatically controlled power and energy between hydraulic control.When electric-control system breaks down, can in the case of non-stop-machine,
Manipulate Hydraulic guide control valve, control executing agency normal work.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Although load sensitive pump 1, hydraulic control load sensing multi-way valve 2, executing agency 3, the first shuttle have more been used herein
Valve 4, the first electric ratio decompression overflow valve 5, the second electric ratio decompression overflow valve 6, the second shuttle valve 7, Hydraulic guide control valve 8, subtract
The terms such as pressure valve 9, fuel tank 10, but it is not precluded from the possibility using other terms.Using these terms just for the sake of more square
Just the essence of the present invention is described and explained；Being construed as any additional limitation is disagreed with spirit of the present invention
The back of the body.
Claims (1)
- A kind of 1. electro-hydraulic dual control hydraulic system of truck-mounted drilling rig, it is characterised in that including：Shuttle valve (4,7), its first input port A are connected with the delivery outlet of Hydraulic guide control valve (8), its second input port B and electricity The delivery outlet of ratio decompression overflow valve (5,6) is connected, its delivery outlet C and hydraulic control load sensing multi-way valve (2) control input mouth (a1, b1) is connected；Executing agency (3), it is connected with the delivery outlet of hydraulic control load sensing multi-way valve (2)；The shuttle valve and electric ratio decompression overflow valve are two, wherein：First input port A of the first shuttle valve (4) is connected with the first delivery outlet A of Hydraulic guide control valve (8), its second input port B is connected with the delivery outlet of the first electric ratio decompression overflow valve (5)；First input port A of the second shuttle valve (7) is connected with the second delivery outlet B of Hydraulic guide control valve, its second input port B with The delivery outlet of second electric ratio decompression overflow valve (6) is connected；The delivery outlet of first shuttle valve (4) and the second shuttle valve (7) connects the different controls of hydraulic control load sensing multi-way valve (2) respectively Input port processed；The electric ratio decompression overflow valve (5,6), Hydraulic guide control valve (8) are connected with pressure-reducing valve (9)；Shuttle valve (4,7) is defeated Outlet C is connected with the control input mouth of hydraulic control load sensing multi-way valve (2), the delivery outlet C operating pressures control liquid of shuttle valve (4,7) Control load sensing multi-way valve (2) job order and valve amount of opening；Also, it is electrical-liquid control pattern and Hydraulic guide control pattern respectively including two control models；When using electrical-liquid control pattern, being connected by shuttle valve (4,7), electric ratio depressurizes overflow valve (5,6) and hydraulic control loads Sensing multi-way valve (2), overflow valve (5,6) control hydraulic control load sensing multi-way valve (2) is depressurized by electric ratio and realizes executing agency (3) Action control；When using Hydraulic guide control pattern, the first input port of shuttle valve (4,7) and the second input port are connected into liquid respectively Pilot-actuated valve (8) and electric ratio decompression overflow valve (5,6) are pressed, overflow valve is depressurized by Hydraulic guide control valve (8) and electric ratio Pressure the higher person controls the action of executing agency by hydraulic control load sensing multi-way valve (2) in (5,6)；Wherein, when using electrical-liquid control pattern, after the first electric ratio decompression overflow valve (5) obtains automatically controlled signal, its Delivery outlet A exports corresponding control pressure, and the delivery outlet C pressure of the first shuttle valve (4) is defeated with the first electric ratio decompression overflow valve (5) Outlet A pressure is identical, and the delivery outlet C of the first shuttle valve (4) connects with the first control input mouth b1 of hydraulic control load sensing multi-way valve (2) Connect, control hydraulic control load sensing multi-way valve (2) works in bottom, its valve opening and the work of the first electric ratio decompression overflow valve (5) It is corresponding to make pressure；After the second electric ratio decompression overflow valve (6) obtains automatically controlled signal, its delivery outlet A exports corresponding control pressure, Now the delivery outlet C pressure of the second shuttle valve (7) is identical with the delivery outlet A pressure of the second electric ratio decompression overflow valve (6), the second shuttle The delivery outlet C of valve (7) is connected with the second control input mouth a1 of hydraulic control load sensing multi-way valve (2), controls hydraulic control load-sensitive Banked direction control valves (2) works in upper, and its valve opening is corresponding with second electric ratio decompression overflow valve (6) operating pressure；Wherein, when using Hydraulic guide control pattern, when electric ratio is when decompression overflow valve (5,6) and hydraulic control pilot-actuated valve (8) when while acting, the delivery outlet C operating pressures and electric ratio of shuttle valve (4,7) are when decompression overflow valve (5,6) and hydraulic control guide control The higher person operating pressure is identical in both valves (8) processed；Wherein, the delivery outlet C of the first shuttle valve (4) and hydraulic control load sensing multi-way valve (2) the first control input mouth b1 connections, the delivery outlet C of the second shuttle valve (7) and the second control of hydraulic control load sensing multi-way valve (2) A1 connections in input port processed；Hydraulic control load sensing multi-way valve (2) is controlled respectively by the first shuttle valve (4) and the second shuttle valve (7) upper Switch between bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610768943.8A CN106321541B (en) | 2016-08-30 | 2016-08-30 | A kind of electro-hydraulic dual control hydraulic system of truck-mounted drilling rig and method |
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| CN201610768943.8A CN106321541B (en) | 2016-08-30 | 2016-08-30 | A kind of electro-hydraulic dual control hydraulic system of truck-mounted drilling rig and method |
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| CN106321541B true CN106321541B (en) | 2018-03-27 |
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| JP6683640B2 (en) * | 2017-02-20 | 2020-04-22 | 日立建機株式会社 | Construction machinery |
| CN106762916B (en) * | 2017-02-28 | 2018-09-04 | 徐工集团工程机械有限公司 | Work connection, load sensing multi-way valve and engineering machinery |
| JP6781117B2 (en) * | 2017-07-28 | 2020-11-04 | 日立建機株式会社 | Dump truck braking system |
| CN107795278B (en) * | 2017-11-16 | 2023-08-01 | 恒天九五重工有限公司 | Speed limiting method for working device of pile driver and hydraulic speed limiting system |
| CN109723694A (en) * | 2019-01-30 | 2019-05-07 | 柳州柳工液压件有限公司 | Electric control multi-way valve |
| CN110454140B (en) * | 2019-07-22 | 2022-10-18 | 中煤科工集团西安研究院有限公司 | Drilling machine electro-hydraulic dual-control system with integrated hydraulic linkage valve block and method |
| CN111350459B (en) * | 2020-03-12 | 2021-07-27 | 中煤科工集团西安研究院有限公司 | Double-diesel-engine power vehicle-mounted drilling machine and control method thereof |
| CN111627284A (en) * | 2020-06-08 | 2020-09-04 | 湖南翰坤实业有限公司 | VR-based children earthquake safety education simulation system and method |
| CN113757203B (en) * | 2021-09-13 | 2022-04-15 | 徐工集团工程机械股份有限公司科技分公司 | Loader electric control hydraulic system and loader |
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| JP2011106591A (en) * | 2009-11-18 | 2011-06-02 | Hitachi Constr Mach Co Ltd | Hydraulic driving device of construction machine |
| CN202508776U (en) * | 2012-02-28 | 2012-10-31 | 三一汽车起重机械有限公司 | Pilot control system with double control modes and crane |
| CN103925261B (en) * | 2014-04-10 | 2015-11-18 | 中煤科工集团西安研究院有限公司 | A kind of rig electrichydraulic control anticollision device |
| CN104235090B (en) * | 2014-07-23 | 2016-08-24 | 北京市三一重机有限公司 | Negative feedback hydraulic system and rotary drilling rig |
| CN204942135U (en) * | 2015-08-25 | 2016-01-06 | 中国人民解放军63983部队 | The control gear of excavator hydraulic system |
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