CN104563856B - Fast discharge of rotary drill rig control system - Google Patents
Fast discharge of rotary drill rig control system Download PDFInfo
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- CN104563856B CN104563856B CN201510020196.5A CN201510020196A CN104563856B CN 104563856 B CN104563856 B CN 104563856B CN 201510020196 A CN201510020196 A CN 201510020196A CN 104563856 B CN104563856 B CN 104563856B
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- 238000006757 chemical reactions by type Methods 0.000 claims abstract description 53
- 239000012530 fluid Substances 0.000 claims abstract description 47
- 239000002689 soil Substances 0.000 claims abstract description 28
- 239000003921 oil Substances 0.000 claims description 56
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000002828 fuel tank Substances 0.000 claims description 7
- 239000010720 hydraulic oil Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000009429 distress Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 description 13
- 238000013016 damping Methods 0.000 description 4
- 241001074085 Scophthalmus aquosus Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
-
- 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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Earth Drilling (AREA)
Abstract
nullA kind of fast discharge of rotary drill rig control system，Including reaction type variable pump、LS feedback valve、The reversing valve connecting commutated with guide and power head motor，Also include pressure flow control device，Described pressure flow control device is provided with three hydraulic fluid ports，First hydraulic fluid port (5a) is connected with the outlet pressure oil circuit of described reaction type variable pump by pipeline，Second hydraulic fluid port (5b) is connected with the outlet pressure oil circuit of LS feedback valve by pipeline，3rd hydraulic fluid port (5c) is connected with the oil circuit control of the load-reacting control valve of reaction type variable pump by pipeline，Described pressure flow control device using the outlet pressure of reaction type variable pump or the outlet pressure of LS feedback valve as the Variable Control signal of reaction type variable pump，The present invention realizes off-load by arranging unloader，Ensure system reliability，Not only realized quickly throwing soil but also eliminating system pressure impact，System is compensated for downstream pressure，To meet efficiency of construction and system stability requirement.
Description
Technical field
The present invention relates to piling machinery field, relate more specifically to a kind of fast discharge of rotary drill rig control system.
Background technology
Rotary drilling rig, due to features such as its pore-forming efficiency are high, hole quality is good, low in the pollution of the environment, geological adaptability is wide, becomes main force's construction of filling pile construction.Its pore-forming principle is to drive drill bit revolution under telescopic drill rod rotates and drives, the brill tooth rotary cutting being arranged on drilling bucket excavates soil layer, the native slag simultaneously cutting digged down is brought in drilling bucket, is then promoted to outside hole unload soil, so circulation by telescopic drill rod by drilling bucket and creeps into formation stake holes.One cycle of operation includes putting brill and creeps into and propose brill revolution and unload soil revolution playback totally 5 operating modes, and when creeping into the geology such as higher, the band water clay of mud content, the part ground bored under tooth cutting sticks to drilling bucket inwall so that unloads soil the most difficult, has a strong impact on rotary drilling rig efficiency of construction.Rotary drilling rig unloads soil at present mainly two kinds of operational approach: 1., under geotechnique's condition thrown by unit head, control the positive and negative high-speed rotation of unit head by being switched fast unit head pilot handle；2. under throwing geotechnique's condition, control unit head speed change in the same direction to rotate, both solution principle are all the inertia utilizing and adhering to ground carries out throwing soil.In operational approach 1, rotary drilling rig pilot control handle when quickly throwing soil quickly commutates, the positive and negative high-speed rotation of unit head, now to quickly throw soil control system response speed require higher, slowly will cause throwing native unable, throwing soil difficulty if response speed is crossed, reduce machine efficiency of construction.
See Fig. 1, the unit head control system theory structure of rotary drilling rig in prior art.As it can be seen, rotary drilling rig hydraulic system use for reaction type variable pump 1, wherein 11 is reaction type variable pump main body, and 121 is load-reacting control valve, and 122 is variable displacement with constant power control valve, and 131 is Variable Control oil cylinder, and 132 is servo-cylinder；2 is LS feedback valve, and wherein 21 is LS signal oil meter in damping, and 22 is LS signal oil meter out damping；The reversing valve connecting that 3 is band guide commutation, 31 is reversal valve main valve, and 321 keep check valve for unit head reversal pressure, and 322 rotate forward pressure holds one-way valve for unit head, and 33 is LS pressure-compensated valve, and 34 is main overflow valve, and 35 is LS overflow valve；41 is the first power head motor, and 42 is the second power head motor.
This unit head control system is the double reductor unit head control system of double motor, and it includes two power head motors 41,42.Reversion oil-in 41a, 42a of each power head motor all connects with reversion oil inlet passage A, rotating forward oil-in 41b, 42b of each power head motor all connects with rotating forward oil inlet passage B, i.e. the branch road at power head motor 41 place and the branch circuit parallel connection at power head motor 42 place is arranged.In Fig. 1, direction of arrow instruction is pressure oil oil-feed direction.
When in guide's joystick, be failure to actuate in position, a, b mouth pressure of the reversing valve connecting 3 commutated with guide is 0, position in reversal valve main valve 31 holding, LS pressure-compensated valve 33 cuts out, LS feedback valve 2 pressure is 0, the left position of load-reacting control valve 121 works, and now reaction type variable pump 1 works with minimum injection rate.
When unit head rotates forward, operated pilot joystick, the b mouth of guide's hydraulic oil to reversing valve connecting 3, promoting reversal valve main valve 31 to commutate, pressure oil, through LS pressure-compensated valve 33, rotates forward pressure holds one-way valve 322 to passage B mouth, motor 41 and motor 42 rotate forward, and complete unit head and rotate forward；Simultaneously when LS pressure-compensated valve 33 is opened, LS pressure signal oil returns to reaction type variable pump 1 through LS feedback valve 2, and the right position of load-reacting control valve 121 works, and reaction type variable pump main body 11 discharge capacity raises；
When unit head inverts, operated pilot joystick, a mouth of guide's hydraulic oil to reversing valve connecting 3, promoting reversal valve main valve 31 to commutate, pressure oil keeps check valve 321 to passage A mouth through LS pressure-compensated valve 33, reversal pressure, motor 41 and motor 42 invert, and complete unit head reversion；Simultaneously when LS pressure-compensated valve 33 is opened, LS pressure signal oil works through 2 times reaction type variable pumps 1 of LS feedback transmitter, the right position of load-reacting control valve 121, and reaction type variable pump 1 discharge capacity raises.
Therefore, when rotary drilling rig throws geotechnique's condition, pilot control handle is switched fast, and the discharge capacity of reaction type variable pump 1 changes repeatedly in this process, and now the variable response time of variable pump Ore-controlling Role is the principal element that soil efficiency is thrown in impact.Existing control system utilizes LS pressure-compensated valve 33 outlet pressure signal after being positioned at reversal valve main valve 31 to control reaction type variable pump variable, i.e. signal oil is drawn after reversal valve main valve 31, response speed is slower, although this kind of control mode makes smooth operation but do not meet fast discharge of rotary drill rig actual condition.
In patent of invention 200910042885.0, propose a kind of outlet pressure signal directly utilizing reaction type variable pump under throwing geotechnique's condition and control the control mode of feedback variable pump, accelerate response speed.But, this patent of invention is to compensate system for upstream pressure, and LS pressure-compensated valve is before reversal valve main valve, and does not has to eliminate the compression shock quickly throwing local products life.
Summary of the invention
It is desirable to provide a kind of can realize quickly throwing soil, the fast discharge of rotary drill rig control system of system pressure impact can be eliminated again, compensate system for downstream pressure, to meet efficiency of construction and system stability requirement.
Patent of the present invention proposes a kind of fast discharge of rotary drill rig control system, including reaction type variable pump, LS feedback valve, the reversing valve connecting commutated with guide and power head motor, also include pressure flow control device, described pressure flow control device is provided with three hydraulic fluid ports, first hydraulic fluid port 5a is connected with the outlet pressure oil circuit of described reaction type variable pump by pipeline, second hydraulic fluid port 5b is connected with the outlet pressure oil circuit of LS feedback valve by pipeline, 3rd hydraulic fluid port 5c is connected with the oil circuit control of the load-reacting control valve of reaction type variable pump by pipeline, described pressure flow control device using the outlet pressure of reaction type variable pump or the outlet pressure of LS feedback valve as the Variable Control signal of reaction type variable pump；
When described pressure flow control device controls the second hydraulic fluid port 5b and the 3rd hydraulic fluid port 5c connection, the pressure controling signal of LS feedback valve is after throttling passage, pass sequentially through solenoid directional control valve hydraulic fluid port 5b to be connected with the oil circuit control of hydraulic fluid port 5c with load-reacting control valve, it is achieved throw at a slow speed soil；
When described pressure flow control device controls the first hydraulic fluid port 5a and the 3rd hydraulic fluid port 5c connection, the outlet pressure control signal of reaction type variable pump passes sequentially through solenoid directional control valve hydraulic fluid port 5a and is connected with the oil circuit control of hydraulic fluid port 5c with load-reacting control valve, it is achieved quickly throw soil.
Described pressure flow control device is two-bit triplet solenoid directional control valve.
Also include a unloader, the hydraulic fluid port P of described unloader is connected with the outlet pressure oil circuit of reaction type variable pump by pipeline, the hydraulic fluid port T of described unloader is connected with fuel tank by pipeline, the hydraulic fluid port L of described unloader is connected with LS feedback valve outlet pressure oil circuit by pipeline, described unloader is provided with two and controls end, right-hand member connects with the outlet pressure oil of reaction type variable pump, left end connects with the outlet pressure oil of LS feedback valve, equipped with spring on the left end of described unloader, the difference of the hydraulic coupling that described spring pre-compression force produces at described reversal valve valve core of main valve with LS feedback valve outlet pressure oil in the hydraulic coupling that described reversal valve valve core of main valve produces more than reaction type variable pump outlet pressure oil；
When quickly throwing soil, when guide's joystick returns middle position moment, position in reversal valve main valve 31 times, cutting off reaction type variable pump 1 outlet pressure oil to be connected with the fluid between power head motor, cause LS feedback valve 2 distress resolves, now reaction type variable pump 1 outlet pressure oil overcomes unloader 6 left end acting force of the spring, unloader right-hand member is connected, reaction type variable pump 1 outlet pressure oil flows back to fuel tank by unloader 6, carries out off-load, effectively reduces system pressure impact.
When LS feedback valve 2 has pressure oil, unloader 6 spool left end hydraulic coupling and spring pressure sum, more than unloader spool right-hand member hydraulic coupling, make spool close；When position LS feedback valve 2 no pressure in reversal valve main valve 31 times, the hydraulic coupling that unloader 6 spool right-hand member hydraulic oil produces overcomes spring pressure, makes spool open, it is achieved off-load.
Described unloader is normally closed type hydraulicchange-over valve.
Using such scheme, native system chooses the outlet pressure of reaction type variable pump as Variable Control signal by pressure flow control device, and described pressure flow control device is two-bit triplet solenoid directional control valve.When solenoid directional control valve is not charged, solenoid directional control valve right-hand member accesses, and LS pressure signal oil controls reaction type variable pump variable by throttling passage, and rotary drilling rig throws at a slow speed soil；When described solenoid directional control valve is charged, solenoid directional control valve left end accesses, and main pump goes out pressure signal and directly controls reaction type variable pump variable, shorten the variable response time of variable feedback pump, realize quickly throwing soil, thus accelerate the response time of system, improve throwing soil efficiency；The present invention realizes off-load by arranging unloader, it is ensured that system reliability.Described unloader is normally closed type hydraulicchange-over valve.In sum, the present invention not only had realized quickly throwing soil but also eliminating system pressure impact.
Accompanying drawing explanation
Fig. 1 is existing throwing soil control system schematic diagram.
Fig. 2 is the systematic schematic diagram of the present invention.
Fig. 3 is the fundamental diagram of unloader of the present invention.
In accompanying drawing, 1, reaction type variable pump, 11, reaction type variable pump main body, 121, load-reacting control valve, 122, variable displacement with constant power control valve, 131, Variable Control oil cylinder, 132, servo-cylinder；2, LS feedback valve, 21, LS signal oil meter in damping, 22, LS signal oil meter out damping；3, the reversing valve connecting of band guide commutation, 31, reversal valve main valve, 321, unit head reversal pressure keep check valve, 322, unit head rotates forward pressure holds one-way valve, and 33, LS pressure-compensated valve, 34, main overflow valve, 35, LS overflow valve, the 41, first power head motor, the 42, second power head motor.
Detailed description of the invention
Patent of the present invention is described further with detailed description of the invention below in conjunction with accompanying drawing:
As shown in Figure 2, the described fuel tank in rotary digging drill power head control system, reaction type variable pump, throttling passage, reversing valve connecting and actuator are connected by technological requirement, the hydraulic fluid port 5a of described solenoid directional control valve 5 is connected with reaction type variable pump 1 outlet pressure oil circuit by pipeline, the hydraulic fluid port 5b of described solenoid directional control valve 5 is connected with LS feedback valve outlet pressure oil circuit by pipeline, and the hydraulic fluid port 5c of described solenoid directional control valve 5 is connected with the oil circuit control of load-reacting control valve 121 on reaction type variable pump 1 by pipeline.The hydraulic fluid port P of described unloader 6 is connected with reaction type variable pump 1 outlet pressure oil circuit by pipeline, and the hydraulic fluid port T of described unloader is connected with fuel tank by pipeline, and the hydraulic fluid port L of described unloader is connected with LS feedback valve outlet pressure oil circuit by pipeline.
When rotary drilling rig throws soil operation, must not be electric by button or on-off control solenoid directional control valve 5, the pressure controling signal of LS feedback valve 2, after throttling passage, passes sequentially through solenoid directional control valve hydraulic fluid port 5b and is connected with the oil circuit control of hydraulic fluid port 5c with load-reacting control valve 121, thus realizes throwing at a slow speed soil；Obtaining electric by button or on-off control solenoid directional control valve 5, the outlet pressure control signal of reaction type variable pump 1 passes sequentially through solenoid directional control valve hydraulic fluid port 5a and is connected with the oil circuit control of hydraulic fluid port 5c with load-reacting control valve 121, it is achieved quickly throw soil.
When quickly throwing soil, when guide's joystick returns middle position moment, position in reversal valve main valve 31 times, cutting off reaction type variable pump 1 outlet pressure oil to be connected with the fluid between power head motor, cause LS feedback valve 2 distress resolves, now reaction type variable pump 1 outlet pressure oil overcomes unloader 6 left end acting force of the spring, unloader right-hand member is connected, reaction type variable pump 1 outlet pressure oil flows back to fuel tank by unloader 6, carries out off-load, effectively reduces system pressure impact.
When LS feedback valve 2 has pressure oil, unloader 6 spool left end hydraulic coupling and spring pressure sum, more than unloader spool right-hand member hydraulic coupling, make spool close；When reversal valve main valve 31 main valve plug Hui Zhongwei, LS feedback valve 2 no pressure, the hydraulic coupling that unloader 6 spool right-hand member hydraulic oil produces overcomes spring pressure, makes spool open, it is achieved off-load.
Above one fast discharge of rotary drill rig control system of the present invention is described in detail.Apply existing unit head to throw soil control system herein principle and the embodiment of the present invention are set forth, the method being only intended to help to understand patent of the present invention described above and core concept thereof.It should be pointed out that, and utilize pump discharge pressure signal and on this path, add various pressure and volume control device to control reaction type variable pump variable all at the protection domain of this patent.
Claims (4)
1. a fast discharge of rotary drill rig control system, anti-including reaction type variable pump, LS
Feedback valve, the reversing valve connecting of band guide commutation and power head motor, it is characterised in that: also include pressure
Power volume control device, described pressure flow control device is provided with three hydraulic fluid ports, the first hydraulic fluid port
(5a) it is connected with the outlet pressure oil circuit of described reaction type variable pump by pipeline, the second hydraulic fluid port
(5b) it is connected with the outlet pressure oil circuit of LS feedback valve by pipeline, the 3rd hydraulic fluid port (5c)
It is connected by the oil circuit control of pipeline with the load-reacting control valve of reaction type variable pump, institute
State pressure flow control device by the outlet pressure of reaction type variable pump or the outlet of LS feedback valve
Pressure is as the Variable Control signal of reaction type variable pump；
When described pressure flow control device controls the second hydraulic fluid port (5b) and the 3rd hydraulic fluid port (5c)
During connection, the pressure controling signal of LS feedback valve, after throttling passage, passes sequentially through pressure current
Amount control device the second hydraulic fluid port (5b) and the 3rd hydraulic fluid port (5c) and load-reacting control valve
Oil circuit control be connected, it is achieved throw at a slow speed soil；
When described pressure flow control device controls the first hydraulic fluid port (5a) and the 3rd hydraulic fluid port (5c)
During connection, the outlet pressure control signal of reaction type variable pump passes sequentially through pressure flow hybrid control dress
Put the control oil of the first hydraulic fluid port (5a) and the 3rd hydraulic fluid port (5c) and load-reacting control valve
Road is connected, it is achieved quickly throw soil.
Fast discharge of rotary drill rig control system the most according to claim 1, its feature
It is: described pressure flow control device is two-bit triplet solenoid directional control valve.
Fast discharge of rotary drill rig control system the most according to claim 2, its feature
Being: also include a unloader, the hydraulic fluid port P of described unloader is by pipeline and reaction type variable
Delivery side of pump pressure oil circuit is connected, and the hydraulic fluid port T of described unloader is connected with fuel tank by pipeline,
The hydraulic fluid port L of described unloader is connected with LS feedback valve outlet pressure oil circuit by pipeline, described
Unloader is provided with two and controls end, and right-hand member connects with the outlet pressure oil of reaction type variable pump, left
End connects with the outlet pressure oil of LS feedback valve, equipped with spring on the left end of described unloader,
Described spring pre-compression force is electric at described two-bit triplet more than reaction type variable pump outlet pressure oil
The hydraulic coupling that magnetic reversal valve valve core of main valve produces and LS feedback valve outlet pressure oil are at described two
The difference of the hydraulic coupling that three-way solenoid valve valve core of main valve produces；
When quickly throwing soil, when guide's joystick returns middle position moment, two-bit triplet solenoid directional control valve
Main valve Hui Zhongwei, cuts off the fluid between reaction type variable pump outlet pressure oil and power head motor
Connecting, cause LS feedback valve distress resolves, now reaction type variable pump outlet pressure oil overcomes
Unloader left end acting force of the spring, the connection of unloader right-hand member, reaction type variable pump outlet pressure oil
Flow back to fuel tank by unloader, carry out off-load；
When LS feedback valve has pressure oil, unloader spool left end hydraulic coupling and spring pressure it
With more than unloader spool right-hand member hydraulic coupling, spool is made to close；When two-bit triplet solenoid directional control valve
When main valve returns middle position LS feedback valve no pressure, the hydraulic pressure that unloader spool right-hand member hydraulic oil produces
Power overcomes spring pressure, makes spool open, it is achieved off-load.
Fast discharge of rotary drill rig control system the most according to claim 3, its feature
It is: described unloader is normally closed type hydraulicchange-over valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510020196.5A CN104563856B (en) | 2015-01-15 | 2015-01-15 | Fast discharge of rotary drill rig control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510020196.5A CN104563856B (en) | 2015-01-15 | 2015-01-15 | Fast discharge of rotary drill rig control system |
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| CN104563856A CN104563856A (en) | 2015-04-29 |
| CN104563856B true CN104563856B (en) | 2016-08-24 |
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| CN201510020196.5A Active CN104563856B (en) | 2015-01-15 | 2015-01-15 | Fast discharge of rotary drill rig control system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159184B (en) * | 2019-05-31 | 2024-05-24 | 常州玉柴工程机械有限公司 | Rotary drilling rig power head operation system, operation method and rotary drilling rig |
| CN110296111B (en) * | 2019-06-28 | 2021-05-25 | 北京三一智造科技有限公司 | Hydraulic motor system, rotary drilling rig and using method |
| CN111156210A (en) * | 2020-03-27 | 2020-05-15 | 湖南拓沃重工科技有限公司 | Pumping oil cylinder control system and control method for concrete pump |
| CN114109941B (en) * | 2021-11-23 | 2023-09-26 | 江苏汇智高端工程机械创新中心有限公司 | Integrated multifunctional hydraulic valve oil inlet linkage assembly and hydraulic valve |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4453411B2 (en) * | 2004-03-18 | 2010-04-21 | コベルコ建機株式会社 | Hydraulic control device for work machine |
| CN2883497Y (en) * | 2006-04-12 | 2007-03-28 | 中南大学 | Automatic soil throwing controller of rotary digging drill |
| CN201358710Y (en) * | 2009-03-18 | 2009-12-09 | 湖南山河智能机械股份有限公司 | Clockwise and anticlockwise rotation soil throwing control device of rotary drilling rig |
| CN101514560B (en) * | 2009-03-18 | 2011-04-20 | 湖南山河智能机械股份有限公司 | Method for controlling fast discharge of rotary drill rig |
| CN201666115U (en) * | 2010-03-25 | 2010-12-08 | 徐州博汇东明机械制造有限公司 | One-way high-peed earth throwing electrohydraulic control device of rotary drilling rig |
| CN202926757U (en) * | 2012-11-14 | 2013-05-08 | 山河智能装备股份有限公司 | Load simulation and test system of engineering machine |
| CN204571827U (en) * | 2015-01-15 | 2015-08-19 | 山河智能装备股份有限公司 | Fast discharge of rotary drill rig control system |
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