CN102877501A - Hydraulic control system with functions of automatic control and fine operation, and excavator - Google Patents
Hydraulic control system with functions of automatic control and fine operation, and excavator Download PDFInfo
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- CN102877501A CN102877501A CN2012104261618A CN201210426161A CN102877501A CN 102877501 A CN102877501 A CN 102877501A CN 2012104261618 A CN2012104261618 A CN 2012104261618A CN 201210426161 A CN201210426161 A CN 201210426161A CN 102877501 A CN102877501 A CN 102877501A
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Abstract
The invention discloses a hydraulic control system with the functions of automatic control and fine operation, and an excavator, and belongs to the field of hydraulic technique. The system includes a main valve core, a main valve electrical control end, a main valve pilot end, a main pump and a controller, wherein the main valve core is communicated with the main pump; the main pump is electrically connected with the controller; the pilot oil circuit of a main valve is formed between the main valve core and the main valve pilot end; a main valve electrical control end is connected with the main valve pilot oil circuit; a proportional electromagnetic reduction valve and a reversing valve are arranged on the pilot oil circuit; the proportional electromagnetic reduction valve is electrically connected with the controller; an output end of the proportional electromagnetic reduction valve is communicated with the main valve electrical control end; and both the main valve pilot end and the main valve electric control end are communicated with the reversing valve. According to the invention, as the proportional electromagnetic reduction valve and the reversing valve are additionally arranged on the pilot oil circuit of the main valve core, the controller controls the proportional electromagnetic reduction valve, and fine control, automatic walking and reciprocating oscillation of the system can be realized, so that the operating comfort is improved.
Description
Technical field
The present invention relates to the hydraulic technique field, particularly a kind of hydraulic control system and excavator with automatic control and fine manipulation function.
Background technology
Excavator is a kind of multivariant equipment that has as a kind of engineering mechanical device.The automation function of excavator is fewer in the market, generally is by traditional manually operating.If under particular surroundings, specifically operate, then need the operator to possess rich experience and operant level, otherwise may bring more serious consequence.Along with the continuous progress of science and technology and labourer to the operator to the raising that operation comfort requires, more and more need to improve the functionalized and automatization level of excavator.
The fine motion of excavator work (or fine work action) is finished and is needed the small size manipulation pilot valve of operator to realize at present, this can bring following problem: at first promoting and the lifting weight, and need accurately location placement location, when needing inflammable, explosive, the frangible and band of lifting the solid of harmful to human and the liquid such as to be corrosive, need the operator to operate absorbedly this moment, the long easy generation of operating process is tired, and artificial operational motion is very not steady and accurate, affects operating result; Secondly when carrying out the smooth work of soft terrain, the operator need to not adjust swing arm, dipper and scraper bowl action simultaneously in the situation that digging machine is not walked, and move morely, and sometimes needs to carry out the repetitive work of machinery, easily fatigue.
Summary of the invention
Can not carry out refinement and can't realize the pacifically function of automatically sweeping the floor in order to solve present excavator, easily make the operator produce tired problem, a kind of hydraulic control system and excavator with automatic control and fine manipulation function now is provided.Concrete technical scheme is as follows:
A kind of hydraulic control system with automatic control and fine manipulation function, comprise valve core of main valve, the automatically controlled end of main valve, main valve guide end, main pump and controller, described valve core of main valve and described main pump are communicated with, described main pump and described controller are electrically connected, form guide's oil circuit of main valve between described valve core of main valve and the described main valve guide end, the automatically controlled end of described main valve is communicated with described main valve guide oil circuit, wherein, be provided with than row electromagnetic relief pressure valve and reversal valve on described guide's oil circuit, described ratio electromagnetic relief pressure valve is electrically connected with the described controller that can be used for controlling its output pressure, the automatically controlled end of the output of described ratio electromagnetic relief pressure valve and described main valve is communicated with, and described main valve guide end and the automatically controlled end of described main valve all are connected with described reversal valve.
Preferably, described valve core of main valve comprises that swing arm spool, rotary valve key, left lateral are walked spool, right lateral is walked spool and straight line moving spool; The automatically controlled end of described main valve comprise swing arm fall automatically controlled, swing arm rise that automatically controlled, left revolution is automatically controlled, right-hand rotation is automatically controlled, left lateral is walked-automatically controlled, the left lateral of advancing walks-retreats automatically controlled, right lateral and walk-advance automatically controlled, right lateral and walk-retreat automatically controlled; Described main valve guide end comprises that swing arm falls, swing arm liter, left revolution, right-hand rotation, left lateral are walked-advanced, left lateral is walked-retreated, right lateral is walked-advanced, right lateral is walked-retreat with straight line moving to switch; Described swing arm spool guide oil circuit, rotary valve key guide oil circuit, left lateral walk spool guide oil circuit, right lateral walk be provided with on the spool guide oil circuit described than row electromagnetic relief pressure valve and described reversal valve.
Preferably, described reversal valve is two position three way directional control valve.
Preferably, described all have eight than row electromagnetic relief pressure valve and described reversal valve.
Preferably, described straight line moving switches the guide to be held when passing into pilot pressure, the left revolution of controller cycle driving is automatically controlled, right-hand rotation is automatically controlled, and controller driven in synchronism left lateral walk-automatically controlled, right lateral walks-automatically controlled, the revolution of property performance period and walking composite move.
Preferably, described straight line moving switching guide holds the pilot pressure that passes into to realize by automatically controlled or hydraulic control.
Preferably, described controller driven in synchronism left lateral is walked-advances automatically controlled and the ratio electromagnetic relief pressure valve that electricly connects is walked-advanced to right lateral, can realize automatically advancing.
A kind of excavator, described excavator are equipped with above-mentioned each described hydraulic control system with automatic control and fine manipulation function.
Compared with prior art, hydraulic control system and excavator with automatic control and fine manipulation function that technique scheme provides have the following advantages: set up ratio electromagnetic relief pressure valve and reversal valve by the guide's oil circuit at valve core of main valve, controller contrast row electromagnetic relief pressure valve is controlled the meticulous control of feasible system and is automatically walked and reciprocally swinging, has improved the comfortableness of operation.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is electromagnetic valve group and the pilot valves hydraulic schematic diagram that provides in the embodiment of the invention;
Fig. 2 is main valve and the main pump hydraulic schematic diagram that provides in the embodiment of the invention;
Fig. 3 is revolution and the walking pilot pressure oscillogram after the action triggers of sweeping the floor that provides in the embodiment of the invention.
In the accompanying drawing, the component list of each label representative is as follows:
1 than row electromagnetic relief pressure valve, 2 pilot valves, 3 swing arm spools, 4 rotary valve keys, 5 left lateral are walked spool, and 6 right laterals are walked spool, 7 straight line moving spools, 8, controller, the governor motion of 9 main pumps, 10, main pump, 11 left revolutions are automatically controlled, 12 left revolutions, and 21 right-hand rotations are automatically controlled, 22 right-hand rotations, 31 swing arms rise automatically controlled, 32 swing arm liters, 41 swing arms fall automatically controlled, and 42 swing arms fall, and 51 left lateral are walked-advance automatically controlled, 52 left lateral are walked-are advanced, and 61 left lateral are walked-retreat automatically controlled, and 62 left lateral are walked-retreated, 71 right laterals are walked-advance automatically controlled, and 72 right laterals are walked-advanced, and 81 right laterals are walked-retreat automatically controlled, 82 right laterals are walked-are retreated, and 92, straight line moving switches, the automatically controlled pilot pressure of 12 left revolutions, the automatically controlled pilot pressure of 13 right-hand rotations, about the automatically controlled pilot pressure of walking-advance, T represents an action cycle.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
As depicted in figs. 1 and 2, the embodiment of the invention provides a kind of hydraulic control system with automatic control and fine manipulation function, comprise valve core of main valve, the automatically controlled end of main valve, main valve guide end, than row electromagnetic relief pressure valve, reversal valve, main pump 10 and controller 8, valve core of main valve and main pump 8 are communicated with, main pump 10 and controller 8 are electrically connected, form guide's oil circuit of main valve between valve core of main valve and the main valve guide end, the automatically controlled end of main valve is communicated with main valve guide oil circuit, wherein, be provided with on guide's oil circuit than row electromagnetic relief pressure valve 2 and reversal valve, ratio electromagnetic relief pressure valve 2 is electrically connected with controller, controller 8 can be used for the output pressure of control ratio electromagnetic relief pressure valve 2, the automatically controlled end of the output of ratio electromagnetic relief pressure valve 2 and main valve is communicated with, and main valve guide end and the automatically controlled end of main valve all are connected with reversal valve.
Concrete, valve core of main valve comprises that swing arm spool 3, rotary valve key 4, left lateral are walked spool 5, right lateral is walked spool 6 and straight line moving spool 7; The automatically controlled end of main valve comprises that swing arm falls that automatically controlled 41, swing arm rises that automatically controlled 31, left revolution is automatically controlled 11, right-hand rotation is automatically controlled 21, left lateral is walked-advanced automatically controlled 51, left lateral and walks-retreat automatically controlled 61, right lateral and walk-advance automatically controlled 71, right lateral and walk-retreat automatically controlled 81; Main valve guide end comprises that swing arm falls 42, swing arm rises 32, left revolution 12, right-hand rotation 22, left lateral walk-advance 52, left lateral walks-retreat 62, right lateral walks-advance 72, right lateral walk-retreat 82 and straight line moving switch 92; Swing arm spool guide oil circuit, rotary valve key guide oil circuit, left lateral are walked spool guide oil circuit, right lateral is walked on the spool guide oil circuit and is provided with than row electromagnetic relief pressure valve 2 and reversal valve.Reversal valve is two position three way directional control valve.Be provided with eight than row electromagnetic relief pressure valve 2 and reversal valve.
Below the simple course of work of describing the embodiment of the invention.
Be provided with a plurality of control instructions at controller and be used for the operator to the operation control of system, include the action command of sweeping the floor, fine motion left-hand rotation instruction, fine motion right-hand rotation instruction, fine motion lifting instruction, fine motion decline instruction, low-speed forward instruction, ease astern instruction and automatic advancement commands.
Guide's oil circuit in left (right side) revolution 12 increases the ratio electromagnetic relief pressure valve, controlled device 8 controls of its output pressure, " left (right side) revolution automatically controlled 11 " end on output and the main valve links to each other, " left (right side) revolution automatically controlled 11 " all is communicated with a two-bit triplet reversal valve with " left (right side) revolution 12 ", when not starting automatically controlled pattern, the operator directly controls rotary valve key 4 by pilot handle " left (right side) revolution " 12 guides and realizes normal operations, when starting automatically controlled pattern, the operator needs to trigger " fine motion left (right side) turns instruction ", controller 8 will be to the solenoid-operated proportional reducing valve 2 output pressure instructions on this guide's oil circuit, governor motion 9 to main pump sends flow instruction, realizes automatic fine motion turning function.
Guide's oil circuit in left (right side) walking increases ratio electromagnetic relief pressure valve 2, controlled device 8 controls of its output pressure, " left (right side) walk-advance (retreating) automatically controlled 51 " end on output and the main valve links to each other, " left (right side) walk-advance (retreating) automatically controlled " 51 all is communicated with a two-bit triplet reversal valve with " walking-advance (retreating) in a left side (right side) " 52, when not starting automatically controlled pattern, the operator directly controls walking spool 5 by guide's foot valve " left (right side) walked-advanced (retreating) " 52 guides and realizes normal operations, when starting automatically controlled pattern, the operator needs to trigger " low-speed forward (retreating) instruction ", controller 8 will be to the solenoid-operated proportional reducing valve 2 output pressure instructions on this guide's oil circuit, governor motion 9 to main pump sends flow instruction, realizes automatic low-speed forward (retreating) function.
Guide's oil circuit at swing arm liter (falling) increases the ratio electromagnetic relief pressure valve, its output pressure is controlled by the controller, " swing arm liter (falling) is automatically controlled " end on output and the main valve links to each other, " swing arm liter (falling) is automatically controlled " all is communicated with a two-bit triplet reversal valve with " swing arm liter (falling) 32 ", when not starting automatically controlled pattern, the operator directly controls swing arm spool 3 by pilot handle " swing arm liter (falling) " 32 guides and realizes normal operations, when starting automatically controlled pattern, the operator needs to trigger " fine motion lifting (decline) instruction ", controller 8 will be to the solenoid-operated proportional reducing valve 2 output pressure instructions on this guide's oil circuit, governor motion 9 to main pump sends flow instruction, realizes automatic fine motion lifting (decline) function.
When the operator triggers " action command of sweeping the floor ", " straight line moving switching " 92 guides end will pass into pilot pressure and enter the straight line moving pattern, and controller 8 will periodically drive " left revolution is automatically controlled " 11, " right-hand rotation is automatically controlled " 21 and driven in synchronism " left lateral is walked-advance automatically controlled " 51 and " right lateral is walked-advance automatically controlled " 71.Be illustrated in figure 3 as the pilot pressure oscillogram of revolution and walking.This moment, the motion state of excavator was: straight line moving at a slow speed, and pivoting support top structure reciprocating swing composite move.Wherein, straight line moving switching guide holds the pilot pressure that passes into to realize by automatically controlled or hydraulic control.
Trigger in " automatically advancement commands " the operator, controller 8 driven in synchronism " left lateral is walked to advance automatically controlled " 51 and " right lateral is walked to advance automatically controlled " 71 ratio electromagnetic relief pressure valves 2, open on the main valve about the spool of walking, send flow instruction with Time Controller 8 to the main pump adjuster, realize automatically advancing of automatic excavator.
In addition, this hydraulic system ratio electromagnetic relief pressure valve quantity that can increase according to actual needs or reduce on the valve core of main valve pilot control loop reaches requirement.This hydraulic system can adopt the solenoid-operated proportional reducing valve fully and not need pilot valve that valve core of main valve is controlled, and realizes multiple automatic control after setting up the automatic function button.
A kind of excavator, this excavator are equipped with the above-mentioned hydraulic control system with automatic control and fine manipulation function.The other parts of excavator can with reference to prior art, not given unnecessary details at you at this.
Disclosed hydraulic control system and the excavator with automatic control and fine manipulation function of the embodiment of the invention increases solenoid-operated proportional reducing valve, reversal valve and the corresponding command switch of increase at guide's oil circuit of revolution, swing arm and walking, can realize various automation controls; The automatic low speed that wherein swing arm promotes and decline fine motion instruction can be carried out weight when excavator carries out lifting operation steadily lifts, and reduces the requirement to operator's technical ability; Walking and rotating automatic control can realize the level land function of automatically sweeping the floor, and are operated in certain angular range, and the different speeds of travel can realize the different patterns of sweeping the floor with speed of gyration.Automatically walking function can allow the operator not handle pedal pilot valve in long distance travel process in addition, reduces labour intensity.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. hydraulic control system with automatic control and fine manipulation function, comprise valve core of main valve, the automatically controlled end of main valve, main valve guide end, main pump and controller, described valve core of main valve and described main pump are communicated with, described main pump and described controller are electrically connected, form guide's oil circuit of main valve between described valve core of main valve and the described main valve guide end, the automatically controlled end of described main valve is communicated with described main valve guide oil circuit, it is characterized in that, be provided with than row electromagnetic relief pressure valve and reversal valve on described guide's oil circuit, described ratio electromagnetic relief pressure valve is electrically connected with the described controller that can be used for controlling its output pressure, the automatically controlled end of the output of described ratio electromagnetic relief pressure valve and described main valve is communicated with, and described main valve guide end and the automatically controlled end of described main valve all are connected with described reversal valve.
2. the hydraulic control system with automatic control and fine manipulation function according to claim 1 is characterized in that, described valve core of main valve comprises that swing arm spool, rotary valve key, left lateral are walked spool, right lateral is walked spool and straight line moving spool; The automatically controlled end of described main valve comprise swing arm fall automatically controlled, swing arm rise that automatically controlled, left revolution is automatically controlled, right-hand rotation is automatically controlled, left lateral is walked-automatically controlled, the left lateral of advancing walks-retreats automatically controlled, right lateral and walk-advance automatically controlled, right lateral and walk-retreat automatically controlled; Described main valve guide end comprises that swing arm falls, swing arm liter, left revolution, right-hand rotation, left lateral are walked-advanced, left lateral is walked-retreated, right lateral is walked-advanced, right lateral is walked-retreat with straight line moving to switch; Described swing arm spool guide oil circuit, rotary valve key guide oil circuit, left lateral walk spool guide oil circuit, right lateral walk be provided with on the spool guide oil circuit described than row electromagnetic relief pressure valve and described reversal valve.
3. the hydraulic control system with automatic control and fine manipulation function according to claim 1 and 2 is characterized in that, described reversal valve is two position three way directional control valve.
4. the hydraulic control system with automatic control and fine manipulation function according to claim 2 is characterized in that, described all have eight than row electromagnetic relief pressure valve and described reversal valve.
5. the hydraulic control system with automatic control and fine manipulation function according to claim 2, it is characterized in that, described straight line moving switches the guide to be held when passing into pilot pressure, the left revolution of controller cycle driving is automatically controlled, right-hand rotation is automatically controlled, and controller driven in synchronism left lateral walks-and automatically controlled, right lateral walks-and automatically controlled, the revolution of property performance period and walking composite move.
6. the hydraulic control system with automatic control and fine manipulation function according to claim 5 is characterized in that, described straight line moving switches the guide holds the pilot pressure that passes into to realize by automatically controlled or hydraulic control.
7. the hydraulic control system with automatic control and fine manipulation function according to claim 2, it is characterized in that, described controller driven in synchronism left lateral is walked-advances automatically controlled and the ratio electromagnetic relief pressure valve that electricly connects is walked-advanced to right lateral, can realize automatically advancing.
8. an excavator is characterized in that, described excavator is equipped with each described hydraulic control system with automatic control and fine manipulation function of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210426161.8A CN102877501B (en) | 2012-10-31 | 2012-10-31 | Hydraulic control system with functions of automatic control and fine operation, and excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210426161.8A CN102877501B (en) | 2012-10-31 | 2012-10-31 | Hydraulic control system with functions of automatic control and fine operation, and excavator |
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| Publication Number | Publication Date |
|---|---|
| CN102877501A true CN102877501A (en) | 2013-01-16 |
| CN102877501B CN102877501B (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210426161.8A Expired - Fee Related CN102877501B (en) | 2012-10-31 | 2012-10-31 | Hydraulic control system with functions of automatic control and fine operation, and excavator |
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| CN (1) | CN102877501B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677582A (en) * | 2015-02-11 | 2015-06-03 | 青岛雷沃挖掘机有限公司 | Walking vibration test method for excavator |
| CN111433413A (en) * | 2017-12-07 | 2020-07-17 | 住友建机株式会社 | Excavator |
| CN111576513A (en) * | 2020-05-25 | 2020-08-25 | 江苏徐工工程机械研究院有限公司 | Land leveler flow control system, method, controller and land leveler |
| CN111663600A (en) * | 2020-06-08 | 2020-09-15 | 雷沃工程机械集团有限公司 | Automatic cruising method and system for excavator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08199632A (en) * | 1995-01-20 | 1996-08-06 | Hitachi Constr Mach Co Ltd | Oil hydraulic circuit for hydraulic shovel |
| JPH11148147A (en) * | 1997-11-14 | 1999-06-02 | Hitachi Constr Mach Co Ltd | Hydraulic driving device for construction machine |
| US20100313557A1 (en) * | 2009-06-16 | 2010-12-16 | Volvo Construction Equipment Holding Sweden Ab. | Hydraulic system for construction equipment having float function |
| CN102605812A (en) * | 2012-03-22 | 2012-07-25 | 三一重机有限公司 | Excavator linear movement control device and excavator linear movement control method |
-
2012
- 2012-10-31 CN CN201210426161.8A patent/CN102877501B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08199632A (en) * | 1995-01-20 | 1996-08-06 | Hitachi Constr Mach Co Ltd | Oil hydraulic circuit for hydraulic shovel |
| JPH11148147A (en) * | 1997-11-14 | 1999-06-02 | Hitachi Constr Mach Co Ltd | Hydraulic driving device for construction machine |
| US20100313557A1 (en) * | 2009-06-16 | 2010-12-16 | Volvo Construction Equipment Holding Sweden Ab. | Hydraulic system for construction equipment having float function |
| CN102605812A (en) * | 2012-03-22 | 2012-07-25 | 三一重机有限公司 | Excavator linear movement control device and excavator linear movement control method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677582A (en) * | 2015-02-11 | 2015-06-03 | 青岛雷沃挖掘机有限公司 | Walking vibration test method for excavator |
| CN111433413A (en) * | 2017-12-07 | 2020-07-17 | 住友建机株式会社 | Excavator |
| CN111576513A (en) * | 2020-05-25 | 2020-08-25 | 江苏徐工工程机械研究院有限公司 | Land leveler flow control system, method, controller and land leveler |
| CN111663600A (en) * | 2020-06-08 | 2020-09-15 | 雷沃工程机械集团有限公司 | Automatic cruising method and system for excavator |
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| Publication number | Publication date |
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| CN102877501B (en) | 2015-01-14 |
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