CN104563856A - Quick soil throwing control system for rotary drilling rig - Google Patents
Quick soil throwing control system for rotary drilling rig Download PDFInfo
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- CN104563856A CN104563856A CN201510020196.5A CN201510020196A CN104563856A CN 104563856 A CN104563856 A CN 104563856A CN 201510020196 A CN201510020196 A CN 201510020196A CN 104563856 A CN104563856 A CN 104563856A
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- valve
- type variable
- variable pump
- hydraulic fluid
- outlet pressure
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- 239000002689 soil Substances 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 title abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 54
- 238000006757 chemical reactions by type Methods 0.000 claims description 48
- 239000012530 fluid Substances 0.000 claims description 43
- 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
- 238000013016 damping Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 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
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag 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
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- 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
The invention provides a quick soil throwing control system for a rotary drilling rig. The system comprises a feedback type variable pump, an LS feedback valve, a reversing valve coupling with the pilot reversing function, a power head motor and a pressure flow rate control device; the pressure flow rate control device is equipped with three oil openings; the first oil opening 5a is connected with an outlet pressure oil channel of the feedback type variable pump; the second oil opening 5b is connected with the outlet pressure oil channel of the LS feedback valve through the pipeline; the third oil opening 5c is connected with a control oil channel of a load-sensitive variable control valve of the feedback type variable pump through the pipeline; the outlet pressure of the feedback type variable pump or the outlet pressure of the LS feedback valve is treated as a variable control signal of the feedback type variable pump through the pressure flow rate control device. According to the system, an unloading valve is arranged to unload, thus the system reliability is ensured, the oil can be quickly thrown, and the pressure impact of the system can be removed; the system is applied to downstream pressure compensating system and meets the requirements on construction efficiency and system stability.
Description
Art
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 drives drill bit to turn round under telescopic drill rod rotary actuation, the brill tooth rotary cutting be arranged on drilling bucket excavates soil layer, bring in drilling bucket by cutting the native slag that digs down, to be then promoted to outside hole by drilling bucket by telescopic drill rod and to unload soil, so formation stake holes is crept in circulation simultaneously.An one working cycles comprises putting bore-creep into-to carry bore-turn round-unloads soil-revolution playback totally 5 operating modes, and when creeping into the geology such as mud content is higher, band water clay, the part ground bored under tooth cutting sticks to drilling bucket inwall, make to unload soil very difficult, have a strong impact on rotary drilling rig efficiency of construction.Current rotary drilling rig unloads soil and mainly contains two kinds of methods of operating: 1. under geotechnological condition thrown by unit head, controls the positive and negative high-speed rotation of unit head by switching unit head pilot handle fast; 2. under the geotechnological condition of throwing, controlling unit head speed change rotation in the same direction, this two schemes principle is all utilize the inertia adhering to ground to carry out throwing soil.In method of operating 1, rotary drilling rig pilot control handle when throwing fast soil commutates fast, the positive and negative high-speed rotation of unit head, now to throw fast native 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 shown in the figure, what rotary drilling rig hydraulic system adopted is reaction type variable pump 1, and 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; 3 reversing valve connectings commutated for band guide, 31 is reversal valve main valve, and 321 is that unit head reversal pressure keeps one way valve, and 322 is that unit head rotates forward pressure holds one-way valve, 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 two reductor unit head control system of double motor, and it comprises two power head motors 41,42.Reversion oil-in 41a, 42a of each power head motor are all communicated with reversion oil inlet passage A, rotating forward oil-in 41b, 42b of each power head motor are all communicated with rotating forward oil inlet passage B, and namely the branch road at power head motor 41 place and the branch circuit parallel connection at power head motor 42 place are arranged.In Fig. 1, direction of arrow instruction is pressure oil oil-feed direction.
When guide's joystick meta is failure to actuate, a, b mouth pressure of the reversing valve connecting 3 commutated with guide is 0, reversal valve main valve 31 keeps meta, LS pressure-compensated valve 33 cuts out, LS feedback valve 2 pressure is 0, load-reacting control valve 121 left position work, now reaction type variable pump 1 is with minimum injection rate work.
When unit head rotates forward, operated pilot joystick, guide's hydraulic oil is to the b mouth of reversing valve connecting 3, promote reversal valve main valve 31 to commutate, pressure oil, through LS pressure-compensated valve 33, rotates forward pressure holds one-way valve 322 to channel 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 gets back to reaction type variable pump 1 through LS feedback valve 2, load-reacting control valve 121 right position work, and reaction type variable pump main body 11 discharge capacity raises;
When unit head reverses, operated pilot joystick, guide's hydraulic oil is to a mouth of reversing valve connecting 3, promote reversal valve main valve 31 to commutate, pressure oil is through LS pressure-compensated valve 33, and reversal pressure keeps one way valve 321 to passage A mouth, motor 41 and motor 42 reverse, and complete unit head reversion; Simultaneously when LS pressure-compensated valve 33 is opened, LS pressure signal oil is through LS feedback transmitter 2 times reaction type variable pumps 1, and load-reacting control valve 121 right position work, reaction type variable pump 1 discharge capacity raises.
Therefore, when rotary drilling rig throws geotechnological condition, pilot control handle switches 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 native 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, namely signal oil is drawn after reversal valve main valve 31, response speed is comparatively slow, although this kind of control mode makes smooth operation not meet fast discharge of rotary drill rig actual condition.
In patent of invention 200910042885.0, a kind of control mode throwing the outlet pressure signal control feedback variable pump directly utilizing reaction type variable pump under geotechnological condition is proposed, fast reaction speed.But this patent of invention is for upstream pressure bucking-out system, LS pressure-compensated valve before reversal valve main valve, and does not have to eliminate the compression shock throwing local products life fast.
Summary of the invention
The present invention aims to provide a kind of fast discharge of rotary drill rig control system that can realize throwing soil fast, can eliminate again system pressure impact, for downstream pressure bucking-out system, to meet efficiency of construction and stability of a system requirement.
Patent of the present invention proposes a kind of fast discharge of rotary drill rig control system, comprise reaction type variable pump, LS feedback valve, the reversing valve connecting commutated with guide and power head motor, also comprise pressure flow control device, described pressure flow control device is provided with three hydraulic fluid ports, first hydraulic fluid port 5a is connected by the outlet pressure oil circuit of pipeline with described reaction type variable pump, 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 by the oil circuit control of pipeline with the load-reacting control valve of reaction type variable pump, described pressure flow control device is using the Variable Control signal of the outlet pressure of the outlet pressure of reaction type variable pump or LS feedback valve as reaction type variable pump,
When described pressure flow control device control the second hydraulic fluid port 5b be communicated with the 3rd hydraulic fluid port 5c time, the pressure controling signal of LS feedback valve is after throttling passage, be connected with the oil circuit control of load-reacting control valve with hydraulic fluid port 5c by solenoid operated directional valve hydraulic fluid port 5b successively, realize throwing soil at a slow speed;
When described pressure flow control device control the first hydraulic fluid port 5a be communicated with the 3rd hydraulic fluid port 5c time, the outlet pressure control signal of reaction type variable pump is connected with the oil circuit control of load-reacting control valve with hydraulic fluid port 5c by solenoid operated directional valve hydraulic fluid port 5a successively, realizes throwing soil fast.
Described pressure flow control device is two-bit triplet solenoid operated directional valve.
Also comprise 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 control ends, right-hand member is communicated with the outlet pressure oil of reaction type variable pump, left end is communicated with the outlet pressure oil of LS feedback valve, the left end of described unloader is equipped with spring, described spring pre-compression force is greater than the difference of the oily hydraulic coupling produced at described reversal valve valve core of main valve of hydraulic coupling that reaction type variable pump outlet pressure oil produces at described reversal valve valve core of main valve and LS feedback valve outlet pressure,
During quick throwing soil, when guide's joystick returns meta moment, reversal valve main valve 31 times metas, cut 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 are greater than unloader spool right-hand member hydraulic coupling, and spool is closed; When reversal valve main valve 31 times meta LS feedback valves 2 are without pressure, the hydraulic coupling that unloader 6 spool right-hand member hydraulic oil produces overcomes spring pressure, spool is opened, realizes off-load.
Described unloader is normally closed type hydraulicchange-over valve.
Adopt such scheme, native system chooses the outlet pressure of reaction type variable pump as Variable Control signal by pressure flow control device, described pressure flow control device is two-bit triplet solenoid operated directional valve.When solenoid operated directional valve is not charged, solenoid operated directional valve right-hand member accesses, and LS pressure signal oil controls reaction type variable pump variable by throttling passage, and rotary drilling rig throws soil at a slow speed; When described solenoid operated directional valve is charged, solenoid operated directional valve left end accesses, and main pump goes out pressure signal and directly controls reaction type variable pump variable, shorten the variable reaction time of variable feedback pump, realize throwing soil fast, thus accelerate the response time of system, improve and throw native efficiency; The present invention realizes off-load by arranging unloader, ensures system reliability.Described unloader is normally closed type hydraulicchange-over valve.In sum, the present invention had not only realized throwing soil fast but also eliminating system pressure impact.
Accompanying drawing explanation
Fig. 1 is the native control system schematic diagram of existing throwing.
Fig. 2 is 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 guide's commutation is with, 31, reversal valve main valve, 321, unit head reversal pressure keeps one way valve, 322, unit head rotates forward pressure holds one-way valve, 33, LS pressure-compensated valve, 34, main overflow valve, 35, LS overflow valve, 41, the first power head motor, the 42, second power head motor.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, patent of the present invention is described further:
As shown in Figure 2, fuel tank in described rotary digging drill power head control system, reaction type variable pump, throttling passage, reversing valve connecting is connected by technological requirement with executing agency, the hydraulic fluid port 5a of described solenoid operated directional valve 5 is connected with reaction type variable pump 1 outlet pressure oil circuit by pipeline, the hydraulic fluid port 5b of described solenoid operated directional valve 5 is connected with LS feedback valve outlet pressure oil circuit by pipeline, and the hydraulic fluid port 5c of described solenoid operated directional 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 native operation, must not be electric by button or switch control rule solenoid operated directional valve 5, the pressure controling signal of LS feedback valve 2, after throttling passage, is connected with the oil circuit control of load-reacting control valve 121 with hydraulic fluid port 5c by solenoid operated directional valve hydraulic fluid port 5b successively, thus realizes throwing soil at a slow speed; Obtain electric by button or switch control rule solenoid operated directional valve 5, the outlet pressure control signal of reaction type variable pump 1 is connected with the oil circuit control of load-reacting control valve 121 with hydraulic fluid port 5c by solenoid operated directional valve hydraulic fluid port 5a successively, realizes throwing soil fast.
During quick throwing soil, when guide's joystick returns meta moment, reversal valve main valve 31 times metas, cut 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 are greater than unloader spool right-hand member hydraulic coupling, and spool is closed; When reversal valve main valve 31 main valve plug returns meta, when LS feedback valve 2 is without pressure, the hydraulic coupling that unloader 6 spool right-hand member hydraulic oil produces overcomes spring pressure, spool is opened, realizes off-load.
Above a kind of fast discharge of rotary drill rig control system of the present invention is described in detail.Apply existing unit head herein to throw native control system and set forth principle of the present invention and embodiment, above explanation is just for helping method and the core concept thereof of understanding patent of the present invention.It should be pointed out that and utilize pump discharge pressure signal and on this path, add various pressure and flow 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, comprise reaction type variable pump, LS feedback valve, the reversing valve connecting commutated with guide and power head motor, it is characterized in that: also comprise pressure flow control device, described pressure flow control device is provided with three hydraulic fluid ports, first hydraulic fluid port 5a is connected by the outlet pressure oil circuit of pipeline with described reaction type variable pump, 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 by the oil circuit control of pipeline with the load-reacting control valve of reaction type variable pump, described pressure flow control device is using the Variable Control signal of the outlet pressure of the outlet pressure of reaction type variable pump or LS feedback valve as reaction type variable pump,
When described pressure flow control device control the second hydraulic fluid port 5b be communicated with the 3rd hydraulic fluid port 5c time, the pressure controling signal of LS feedback valve is after throttling passage, be connected with the oil circuit control of load-reacting control valve with hydraulic fluid port 5c by solenoid operated directional valve hydraulic fluid port 5b successively, realize throwing soil at a slow speed;
When described pressure flow control device control the first hydraulic fluid port 5a be communicated with the 3rd hydraulic fluid port 5c time, the outlet pressure control signal of reaction type variable pump is connected with the oil circuit control of load-reacting control valve with hydraulic fluid port 5c by solenoid operated directional valve hydraulic fluid port 5a successively, realizes throwing soil fast.
2. fast discharge of rotary drill rig control system according to claim 1, is characterized in that: described pressure flow control device is two-bit triplet solenoid operated directional valve.
3. fast discharge of rotary drill rig control system according to claim 1 and 2, it is characterized in that: also comprise 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 control ends, right-hand member is communicated with the outlet pressure oil of reaction type variable pump, left end is communicated with the outlet pressure oil of LS feedback valve, the left end of described unloader is equipped with spring, described spring pre-compression force is greater than the difference of the oily hydraulic coupling produced at described reversal valve valve core of main valve of hydraulic coupling that reaction type variable pump outlet pressure oil produces at described reversal valve valve core of main valve and LS feedback valve outlet pressure,
During quick throwing soil, when guide's joystick returns meta moment, reversal valve main valve returns meta, cut off reaction type variable pump outlet pressure oil to be connected with the fluid between power head motor, cause LS feedback valve distress resolves, now reaction type variable pump outlet pressure oil overcomes unloader left end acting force of the spring, and unloader right-hand member is connected, reaction type variable pump outlet pressure oil flows back to fuel tank by unloader, carries out off-load;
When LS feedback valve has pressure oil, unloader spool left end hydraulic coupling and spring pressure sum are greater than unloader spool right-hand member hydraulic coupling, and spool is closed; When reversal valve main valve returns meta LS feedback valve without pressure, the hydraulic coupling that unloader spool right-hand member hydraulic oil produces overcomes spring pressure, spool is opened, realizes off-load.
4. fast discharge of rotary drill rig control system according to claim 3, is characterized in that: 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 |
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| 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 true CN104563856A (en) | 2015-04-29 |
| CN104563856B 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159184A (en) * | 2019-05-31 | 2019-08-23 | 玉柴桩工(常州)有限公司 | Rotary digging drill power head operating system, operational method and rotary drilling rig |
| CN110296111A (en) * | 2019-06-28 | 2019-10-01 | 北京三一智造科技有限公司 | A kind of hydraulic motor system, rotary drilling rig and application 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 |
| CN114109941A (en) * | 2021-11-23 | 2022-03-01 | 江苏汇智高端工程机械创新中心有限公司 | Integrated multi-functional hydrovalve oil feed allies oneself with subassembly, hydrovalve |
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| 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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159184A (en) * | 2019-05-31 | 2019-08-23 | 玉柴桩工(常州)有限公司 | Rotary digging drill power head operating system, operational method and rotary drilling rig |
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| CN110296111A (en) * | 2019-06-28 | 2019-10-01 | 北京三一智造科技有限公司 | A kind of hydraulic motor system, rotary drilling rig and application method |
| 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 |
| CN114109941A (en) * | 2021-11-23 | 2022-03-01 | 江苏汇智高端工程机械创新中心有限公司 | Integrated multi-functional hydrovalve oil feed allies oneself with subassembly, hydrovalve |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN104563856B (en) | 2016-08-24 |
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