CN104674867B - Hydraulic control system and hydraulic control method for action of bucket rod of excavator - Google Patents
Hydraulic control system and hydraulic control method for action of bucket rod of excavator Download PDFInfo
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- CN104674867B CN104674867B CN201410851021.4A CN201410851021A CN104674867B CN 104674867 B CN104674867 B CN 104674867B CN 201410851021 A CN201410851021 A CN 201410851021A CN 104674867 B CN104674867 B CN 104674867B
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Abstract
The invention provides a hydraulic control system and a hydraulic control method for action of a bucket rod of an excavator. The problem that the existing bucket rod is high in power consumption during compound control action is solved. The hydraulic control system comprises a bucket rod oil cylinder, a moving arm oil cylinder, a bucket oil cylinder, a main pump, an auxiliary pump, a pilot pump, a bucket rod handle, a moving arm handle and a bucket handle, wherein the pilot pump is connected with the bucket rod handle through a pilot oil line; the bucket rod handle is connected with a bucket rod valve through an executing oil line; a detecting oil line is connected with a pressure detecting valve bank; a first signal branch of the pressure detecting valve bank is connected with a feedback opening of the main pump; a second signal branch acts on a switching end of a bucket rod flow collecting valve; a third signal branch is connected with a feedback opening of the auxiliary pump and is serially connected with a two-position three-way reversing valve; and a pressure oil line acts on a switching end of the two-position three-way reversing valve and is connected with a composite action detecting valve bank. During composite action of the bucket rod, pressure on the feedback opening of the auxiliary pump is cut off, the single pump supplies oil for the bucket rod oil cylinder, oil consumption is reduced, and the work efficiency is improved.
Description
Technical field
The invention belongs to excavator technical field, it is related to a kind of power save mode in composite move for excavator boom, special
It is not a kind of excavator boom action hydraulic control system and method.
Background technology
Excavator, when being controlled using existing main valve, in the middle of hydraulic system, for improving operating efficiency, is accelerated to excavate
Speed during action, typically all can allow dipper in excavation or unloading, realize Dual-pump flow-converging.And dipper is whether in one action
Or in composite move, the output flow of pump one and pump two all can be allowed to supply bucket arm cylinder after being collaborated.
Because excavator has interflow function in dipper action, i.e. double pump fuel feeding, therefore " dipper full speed action+swing arm is complete
During speed decline " action, boom cylinder necessary flow is provided by pump two, and bucket arm cylinder necessary flow is carried together with pump two by pump one
For.Therefore：The all of flow of pump one is for giving dipper, and has regeneration function because when swing arm declines, and can rely on regeneration fuel feeding, pump two supplies
Flow to swing arm is less, and the flow of now pump two output is also substantially all and gives dipper.So, the flow of dipper is pump one He
All flows that pump two is provided.
Taking existing excavator test data as a example, when " dipper full speed action+swing arm declines at full speed ", the output stream of pump one
Measure as 168L/min, the output flow of pump two is 158L/min, and the output flow of pump one all supplies dipper, swing arm declines and relies on
Regeneration fuel feeding, seldom, the flow of now pump two output is also substantially all and gives dipper the flow of required pump two in theory, therefore dipper
All flows of being provided by pump one and pump two of flow, that is, 326L/min oil all supply to give dipper.But it is true that now only have
The fluid supply dipper of 203L/min, but the output flow (168L/min) of pump one all supplies dipper, the few portion of pump two only
Divide the output flow supply dipper of (35L/min), the flow of remaining 123L/min all returns fuel tank through bleed off circuit, and this
Partly unnecessary flow increased oil consumption, and the power losing becomes heat, increased the burden of cooling system.Namely
Say, cause the loss of energy and unnecessary heating, waste a part of fuel consumption.
Shown according to test data, simultaneously in " dipper full speed action+swing arm 0～100% action " and " dipper full speed action
During+scraper bowl 0～100% action ", there is also the larger phenomenon of pump two energy loss.
Content of the invention
The purpose of the present invention is that there are the problems referred to above for existing technology it is proposed that one kind is multiple in dipper and other action
Close under operating mode, double pump optimized by hydraulic control and supplies dipper and the distribution of other Flow of Cylinder, make single pump increase discharge capacity fuel feeding,
Realize reducing excavator boom action hydraulic control system and the method for fuel consumption.
The purpose of the present invention can be realized by following technical proposal：Excavator boom action hydraulic control system, including
Bucket arm cylinder, boom cylinder, bucket cylinder, main pump, auxiliary pump and pioneer pump, described bucket arm cylinder connects dipper oil circuit, described bucket
Bucket rod valve is concatenated on bar oil circuit, described main pump is directly connected to bucket rod valve, concatenates dipper converging valve between described auxiliary pump and bucket rod valve；
Described boom cylinder connects swing arm oil circuit, and described swing arm oil circuit concatenates boom valve, and described main pump and auxiliary pump are directly connected to swing arm
Valve；Described bucket cylinder connects scraper bowl oil circuit, and described scraper bowl oil circuit concatenates bucket valve, and described main pump and auxiliary pump are directly connected to shovel
Bucket valve；
Also include dipper handle, swing arm handle and scraper bowl handle, described pioneer pump connects dipper handle by guide's oil circuit,
Described dipper handle passes through to execute oil circuit connection bucket rod valve, retrieves valve group, described pressure retrieval by detecting that oil circuit connects pressure
First bars branch road of valve group connects the feedback port of main pump, and Article 2 signal branch acts on the switch terminal of dipper converging valve,
Article 3 signal branch connects the feedback port of auxiliary pump, concatenation two position three way directional control valve in described Article 3 signal branch, and described two
In the switch terminal of position three-way diverter valve, effect has pressure oil circuit, and described pressure oil circuit connects composite move retrieval valve group；
Described pioneer pump connects swing arm handle by guide's oil circuit, and described swing arm handle passes through to execute oil circuit connection swing arm
Valve, retrieves valve group by detecting that oil circuit connects pressure, the first bars branch road that described pressure retrieves valve group connects the anti-of main pump
Feedback mouth, Article 3 signal branch connects the feedback port of auxiliary pump；
Described pioneer pump connects scraper bowl handle by guide's oil circuit, and described scraper bowl handle passes through to execute oil circuit connection scraper bowl
Valve, retrieves valve group by detecting that oil circuit connects pressure, the first bars branch road that described pressure retrieves valve group connects the anti-of main pump
Feedback mouth, Article 3 signal branch connects the feedback port of auxiliary pump.
In above-mentioned excavator boom action hydraulic control system, described pressure retrieval valve group includes total shuttle valve, main pump
Shuttle valve group, auxiliary pump shuttle valve group, described total shuttle valve connects the switch terminal that Article 2 signal branch acts on dipper converging valve, described master
Pump shuttle valve group passes through the feedback port that the first bars branch road connects main pump, and described auxiliary pump shuttle valve group passes through Article 3 signal branch even
Connect the feedback port of auxiliary pump.
In above-mentioned excavator boom action hydraulic control system, described composite move retrieval valve group include main shuttle valve,
Scraper bowl shuttle valve and swing arm shuttle valve, described scraper bowl shuttle valve has scraper bowl and excavates retrieval end and scraper bowl unloading retrieval end, described swing arm shuttle
Valve has swing arm and rises retrieval end and swing arm decline retrieval end, and described scraper bowl shuttle valve and swing arm shuttle valve are all connected with main shuttle valve, described
Main shuttle valve is acted in the switch terminal of two position three way directional control valve by pressure oil circuit.
In above-mentioned excavator boom action hydraulic control system, described main pump is connected by oil circuit with auxiliary pump.Logical
Cross main pump and the oil communication of auxiliary pump, to form the alternating power control principle between two pumps.
In above-mentioned excavator boom action hydraulic control system, described main pump, auxiliary pump and pioneer pump are all by oil circuit
Connection fuel tank.
The control method of excavator boom action hydraulic control system, when dipper single movement, comprises the following steps：
1), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, a branch road
Enter total shuttle valve and carry out pressure retrieval, another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
2), after the pressure of total shuttle valve is retrieved, first, the pressure retrieval by main pump shuttle valve group for the pilot pressure, feedback
To main pump feedback port Px1, make main pump output pressure fuel feeding；Second, pilot pressure accesses the first waveguide interface (AB) of dipper converging valve,
Switching dipper converging valve connection dipper oil circuit；Three, pilot pressure accesses two three by the first waveguide interface (AB) of dipper converging valve
Logical reversal valve, is connected to auxiliary pump shuttle valve group further and carries out pressure retrieval, feed back to auxiliary pump feedback port Px2, make auxiliary pump output pressure
Fuel feeding；
3), the hydraulic oil of main pump output feeds bucket arm cylinder by bucket rod valve, and the hydraulic oil of auxiliary pump output is closed by dipper
Conflux with the hydraulic oil of main pump after stream valve, together feed bucket arm cylinder through bucket rod valve, realize under dipper single movement operating mode
Dual-pump flow-converging function.
The control method of excavator boom action hydraulic control system, when " dipper action+swing arm declines 0～100% " moves
When making, comprise the following steps：
1), after machine hand operation swing arm handle down maneuver, pilot pressure declines the inspection of retrieval end by the swing arm of swing arm shuttle valve
, to pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve is to cut for rope
The pressure retrieval of auxiliary pump shuttle valve group of breaking, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of swing arm handle, is directly entered the first waveguide interface of boom valve, to dynamic
Arm valve switches over；Do not pass through the pressure retrieval of main pump shuttle valve group, so that main pump feedback port Px1 no pressure is not supplied to boom cylinder
Oil；Do not retrieved by the pressure of auxiliary pump shuttle valve group, make auxiliary pump feedback port Px2 no pressure not increase fuel feeding to boom cylinder；Dynamic
Arm oil cylinder relies on regeneration function, and the minimum injection rate fuel feeding of auxiliary pump, realizes swing arm and declines；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, a branch road
Enter total shuttle valve and carry out pressure retrieval, another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, guide
Pressure only by the pressure retrieval of main pump shuttle valve group, feeds back to main pump feedback port Px1, so that main pump output pressure is supplied to bucket arm cylinder
Oil,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting bucket arm cylinder
Demand, realize composite move operating mode and place an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5 mouth
Pressure.The flow of main pump and auxiliary pump depends on the aperture of dipper valve element, that is, depend on the pilot pressure that dipper handle applies.
The control method of excavator boom action hydraulic control system, when " dipper action+swing arm rises 0～100% " moves
When making, comprise the following steps：
1), after machine hand operation swing arm handle vertical motion, pilot pressure rises the inspection of retrieval end by the swing arm of swing arm shuttle valve
To pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve cuts off rope
The pressure retrieval of auxiliary pump shuttle valve group, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of swing arm handle, and a branch road enters the first waveguide interface of boom valve, right
Boom valve switches over；Another branch road enters main pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to main pump feedback port
Px1, makes main pump output pressure to boom cylinder fuel feeding；Another branch road enters auxiliary pump shuttle valve group and carries out pressure retrieval, pilot pressure
Feed back to auxiliary pump feedback port Px2, make auxiliary pump output pressure to boom cylinder fuel feeding；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, a branch road
Enter total shuttle valve and carry out pressure retrieval, another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, guide
Pressure only by the pressure retrieval of main pump shuttle valve group, feeds back to main pump feedback port Px1, so that main pump output pressure is supplied to bucket arm cylinder
Oil,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting bucket arm cylinder
Demand, realize composite move operating mode and place an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5 mouth
Pressure.The flow of main pump and auxiliary pump depends on the aperture of swing arm valve element, that is, depend on the pilot pressure that swing arm handle applies.
The control method of excavator boom action hydraulic control system, when " dipper action+scraper bowl excavates 0～100% " is moved
When making, comprise the following steps：
1), after machine hand operation scraper bowl handle excavation action, pilot pressure excavates the inspection of retrieval end by the scraper bowl of scraper bowl shuttle valve
To pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve cuts off rope
The pressure retrieval of auxiliary pump shuttle valve group, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of scraper bowl handle, and a branch road enters the first waveguide interface of bucket valve, right
Bucket valve switches over；Another branch road enters main pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to main pump feedback port
Px1, makes main pump output pressure to bucket cylinder fuel feeding；Another branch road enters auxiliary pump shuttle valve group and carries out pressure retrieval, pilot pressure
Feed back to auxiliary pump feedback port Px2, make auxiliary pump output pressure to bucket cylinder fuel feeding；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, a branch road
Enter total shuttle valve and carry out pressure retrieval, another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, guide
Pressure only by the pressure retrieval of main pump shuttle valve group, feeds back to main pump feedback port Px1, so that main pump output pressure is supplied to bucket arm cylinder
Oil,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting bucket arm cylinder
Demand, realize composite move operating mode and place an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5 mouth
Pressure.The flow of main pump and auxiliary pump depends on the aperture of scraper bowl valve element, that is, depend on the pilot pressure that scraper bowl handle applies.
The control method of excavator boom action hydraulic control system, when " dipper action+scraper bowl unloading 0～100% " is moved
When making, comprise the following steps：
1), after machine hand operation scraper bowl handle uninstall action, the scraper bowl unloading retrieval end inspection by scraper bowl shuttle valve for the pilot pressure
To pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve cuts off rope
The pressure retrieval of auxiliary pump shuttle valve group, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of scraper bowl handle, and a branch road enters the first waveguide interface of bucket valve, right
Bucket valve switches over；Another branch road enters main pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to main pump feedback port
Px1, makes main pump output pressure to bucket cylinder fuel feeding；Another branch road enters auxiliary pump shuttle valve group and carries out pressure retrieval, pilot pressure
Feed back to auxiliary pump feedback port Px2, make auxiliary pump output pressure to bucket cylinder fuel feeding；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, a branch road
Enter total shuttle valve and carry out pressure retrieval, another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, guide
Pressure only by the pressure retrieval of main pump shuttle valve group, feeds back to main pump feedback port Px1, so that main pump output pressure is supplied to bucket arm cylinder
Oil,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting bucket arm cylinder
Demand, realize composite move operating mode and place an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5 mouth
Pressure.The flow of main pump and auxiliary pump depends on the aperture of scraper bowl valve element, that is, depend on the pilot pressure that scraper bowl handle applies.
Compared with prior art, this excavator boom action hydraulic control system and method are in dipper and other composite moves
Operating mode under, cut-out pilot pressure feeds back to the pressure of auxiliary pump feedback port by auxiliary pump shuttle valve group, makes single pump to bucket arm cylinder confession
Oil, and the alternating power control principle using two pumps, make the flow of main pump increase, and meet the demand of bucket arm cylinder, thus solve
The problem that the flow that auxiliary pump of having determined is confessed is too much and no road discharges, also just solves excavator and produces high pressure the phenomenon generated heat,
Thus reducing oil consumption, improve operating efficiency；In addition, all computer program letter is made using the control valve of hydraulic system
Single, control low cost, and highly reliable, beneficial to maintenance.
Brief description
Fig. 1 is the structure chart of dipper single movement in the present invention.
Fig. 2 is the structure chart that dipper action in the present invention+swing arm declines 0～100% action.
Fig. 3 is the structure chart that dipper action in the present invention+swing arm rises 0～100% action.
Fig. 4 is the structure chart that dipper action in the present invention+scraper bowl excavates 0～100% action.
Fig. 5 is the structure chart that dipper action in the present invention+scraper bowl unloads 0～100% action.
In figure, 1, bucket arm cylinder；2nd, bucket rod valve；3rd, main pump；4th, auxiliary pump；5th, pioneer pump；6th, dipper handle；7th, total shuttle valve；
8th, main pump shuttle valve group；9th, auxiliary pump shuttle valve group；10th, dipper converging valve；11st, two position three way directional control valve；12nd, main shuttle valve；13rd, scraper bowl shuttle
Valve；14th, swing arm shuttle valve；15th, boom cylinder；16th, boom valve；17th, swing arm handle；18th, bucket cylinder；19th, bucket valve；20th, shovel
Bucket handle.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
This excavator boom action hydraulic control system, including bucket arm cylinder 1, boom cylinder 15, bucket cylinder 18, main pump
3rd, auxiliary pump 4 and pioneer pump 5.Bucket arm cylinder 1 connects dipper oil circuit, and dipper oil circuit concatenates bucket rod valve 2, and main pump 3 is directly connected to struggle against
Stem valve 2, concatenates dipper converging valve 10 between auxiliary pump 4 and bucket rod valve 2；Boom cylinder 15 connects swing arm oil circuit, and swing arm oil circuit is gone here and there
Connect boom valve 16, main pump 3 and auxiliary pump 4 are directly connected to boom valve 16；Bucket cylinder 18 connects scraper bowl oil circuit, and scraper bowl oil circuit concatenates
Bucket valve 19, main pump 3 and auxiliary pump 4 are directly connected to bucket valve 19.
This excavator boom action hydraulic control system, also includes dipper handle 6, swing arm handle 17 and scraper bowl handle 20.
Pioneer pump 5 connects dipper handle 6 by guide's oil circuit, and dipper handle 6 passes through to execute oil circuit connection bucket rod valve 2, by detection oil
Road connects pressure retrieval valve group, and pressure retrieves the feedback port of the first bars branch road connection main pump 3 of valve group, and the second bars is propped up
Road acts on the switch terminal of dipper converging valve 10, and Article 3 signal branch connects the feedback port of auxiliary pump 4, in Article 3 signal branch
Concatenation two position three way directional control valve 11, effect in the switch terminal of two position three way directional control valve 11 has pressure oil circuit, and pressure oil circuit connects multiple
Close action retrieval valve group.
Pioneer pump 5 connects swing arm handle 17 by guide's oil circuit, and swing arm handle 17 passes through to execute oil circuit connection boom valve 16,
Retrieve valve group by detecting that oil circuit connects pressure, pressure retrieves the feedback port of the first bars branch road connection main pump 3 of valve group, the
Three bars branch roads connect the feedback port of auxiliary pump 4.
Pioneer pump 5 connects scraper bowl handle 20 by guide's oil circuit, and scraper bowl handle 20 passes through to execute oil circuit connection bucket valve 19,
Retrieve valve group by detecting that oil circuit connects pressure, pressure retrieves the feedback port of the first bars branch road connection main pump 3 of valve group, the
Three bars branch roads connect the feedback port of auxiliary pump 4.
Pressure retrieval valve group includes total shuttle valve 7, main pump shuttle valve group 8, auxiliary pump shuttle valve group 9, and total shuttle valve 7 connects the second bars
Branch road acts on the switch terminal of dipper converging valve 10, and main pump shuttle valve group 8 passes through the feedback that the first bars branch road connects main pump 3
Mouthful, auxiliary pump shuttle valve group 9 connects the feedback port of auxiliary pump 4 by Article 3 signal branch.
Composite move retrieval valve group includes main shuttle valve 12, scraper bowl shuttle valve 13 and swing arm shuttle valve 14, and scraper bowl shuttle valve 13 has shovel
Bucket excavates retrieves end and scraper bowl unloading retrieval end, and swing arm shuttle valve 14 has swing arm and rises retrieval end and swing arm decline retrieval end, shovel
Bucket shuttle valve 13 and swing arm shuttle valve 14 are all connected with main shuttle valve 12, and main shuttle valve 12 acts on two position three way directional control valve 11 by pressure oil circuit
Switch terminal on.
Main pump 3 is connected by oil circuit with auxiliary pump 4.By the oil communication of main pump 3 and auxiliary pump 4, to be formed between two pumps
Alternating power control principle.Main pump 3, auxiliary pump 4 and pioneer pump 5 are all by oil communication fuel tank.
As shown in figure 1, the control method of excavator boom action hydraulic control system, when dipper single movement, including
Following steps：
1), after machine hand operation dipper handle 6 action, guide oil that pioneer pump 5 is confessed passes through the switching of dipper handle 6, and one
Branch road enters total shuttle valve 7 and carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve 2, and bucket rod valve 2 is cut
Change；
2), after the pressure of total shuttle valve 7 is retrieved, first, the pressure retrieval by main pump shuttle valve group 8 for the pilot pressure, instead
Feed main pump feedback port Px1, make main pump 3 output pressure fuel feeding；Second, pilot pressure accesses the first waveguide interface of dipper converging valve 10
(AB), switching dipper converging valve 10 connection dipper oil circuit；Three, pilot pressure is connect by the first waveguide interface (AB) of dipper converging valve 10
Enter two position three way directional control valve 11, be connected to auxiliary pump shuttle valve group 9 further and carry out pressure retrieval, feed back to auxiliary pump feedback port Px2, make auxiliary
Pump 4 output pressure fuel feeding；
3), the hydraulic oil of main pump 3 output feeds bucket arm cylinder 1 by bucket rod valve 2, and the hydraulic oil of auxiliary pump 4 output passes through bucket
Conflux with the hydraulic oil of main pump 3 after bar converging valve 10, together feed bucket arm cylinder 1 through bucket rod valve 2, realize dipper single movement
Dual-pump flow-converging function under operating mode.
As shown in Fig. 2 the control method of excavator boom action hydraulic control system, when " dipper action+swing arm declines 0
～100% ", during action, comprise the following steps：
1), after machine hand operation swing arm handle 17 down maneuver, pilot pressure declines retrieval by the swing arm of swing arm shuttle valve 14
End retrieves pressure signal, acts in the switch terminal of two position three way directional control valve 11 through main shuttle valve 12, and switching two-position three way changes
Retrieved to valve 11 with the pressure cutting off auxiliary pump shuttle valve group 9, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder 1 fuel feeding；
2), the guide oil that pioneer pump 5 is confessed passes through the switching of swing arm handle 17, is directly entered first connecting of boom valve 16
Mouthful, boom valve 16 is switched over；Do not pass through the pressure retrieval of main pump shuttle valve group 8, make main pump feedback port Px1 no pressure and not to
Boom cylinder 15 fuel feeding；Do not retrieved by the pressure of auxiliary pump shuttle valve group 9, make auxiliary pump feedback port Px2 no pressure and not to swing arm oil
Cylinder 15 increases fuel feeding；Boom cylinder 15 relies on regeneration function, and the minimum injection rate fuel feeding of auxiliary pump 4, realizes swing arm and declines；
3), after machine hand operation dipper handle 6 action, guide oil that pioneer pump 5 is confessed passes through the switching of dipper handle 6, and one
Branch road enters total shuttle valve 7 and carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve 2, and bucket rod valve 2 is cut
Change；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group 9 is cut-off, therefore auxiliary pump 4 is not to bucket arm cylinder 1 fuel feeding, first
Pilot power only by the pressure retrieval of main pump shuttle valve group 8, feeds back to main pump feedback port Px1, makes main pump 3 output pressure to dipper oil
Cylinder 1 fuel feeding,
5), utilize the alternating power control principle of main pump 3 and auxiliary pump 4, so that the flow of main pump 3 is increased, until meeting dipper
The demand of oil cylinder 1, realizes composite move operating mode and places an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve 11 only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5
The pressure of mouth.The flow of main pump 3 and auxiliary pump 4 depends on the aperture of bucket rod valve 2 core, that is, depend on the guide that dipper handle 6 applies
Pressure.
As shown in figure 3, the control method of excavator boom action hydraulic control system, when " dipper action+swing arm rises 0
～100% ", during action, comprise the following steps：
1), after machine hand operation swing arm handle 17 vertical motion, pilot pressure rises retrieval by the swing arm of swing arm shuttle valve 14
End retrieves pressure signal, acts in the switch terminal of two position three way directional control valve 11 through main shuttle valve 12, and switching two-position three way changes
Cut off the pressure retrieval of auxiliary pump shuttle valve group 9 to valve 11, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder 1 fuel feeding；
2), the guide oil that pioneer pump 5 is confessed passes through the switching of swing arm handle 17, and a branch road enters first connecting of boom valve 16
Mouthful, boom valve 16 is switched over；Another branch road enters main pump shuttle valve group 8 and carries out pressure retrieval, and pilot pressure feeds back to main pump
Feedback port Px1, makes main pump 3 output pressure to boom cylinder 15 fuel feeding；Another branch road enters auxiliary pump shuttle valve group 9 and carries out pressure inspection
Rope, pilot pressure feeds back to auxiliary pump feedback port Px2, makes auxiliary pump 4 output pressure to boom cylinder 15 fuel feeding；
3), after machine hand operation dipper handle 6 action, guide oil that pioneer pump 5 is confessed passes through the switching of dipper handle 6, and one
Branch road enters total shuttle valve 7 and carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve 2, and bucket rod valve 2 is cut
Change；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group 9 is cut-off, therefore auxiliary pump 4 is not to bucket arm cylinder 1 fuel feeding, first
Pilot power only by the pressure retrieval of main pump shuttle valve group 8, feeds back to main pump feedback port Px1, makes main pump 3 output pressure to dipper oil
Cylinder 1 fuel feeding,
5), utilize the alternating power control principle of main pump 3 and auxiliary pump 4, so that the flow of main pump 3 is increased, until meeting dipper
The demand of oil cylinder 1, realizes composite move operating mode and places an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve 11 only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5
The pressure of mouth.The flow of main pump 3 and auxiliary pump 4 depends on the aperture of swing arm valve element, that is, depend on the guide that swing arm handle 17 applies
Pressure.
As shown in figure 4, the control method of excavator boom action hydraulic control system, when " dipper action+scraper bowl excavates 0
～100% ", during action, comprise the following steps：
1), after machine hand operation scraper bowl handle 20 excavation action, pilot pressure excavates retrieval by the scraper bowl of scraper bowl shuttle valve 13
End retrieves pressure signal, acts in the switch terminal of two position three way directional control valve 11 through main shuttle valve 12, and switching two-position three way changes
Cut off the pressure retrieval of auxiliary pump shuttle valve group 9 to valve 11, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder 1 fuel feeding；
2), the guide oil that pioneer pump 5 is confessed passes through the switching of scraper bowl handle 20, and a branch road enters first connecting of bucket valve 19
Mouthful, bucket valve 19 is switched over；Another branch road enters main pump shuttle valve group 8 and carries out pressure retrieval, and pilot pressure feeds back to main pump
Feedback port Px1, makes main pump 3 output pressure to bucket cylinder 18 fuel feeding；Another branch road enters auxiliary pump shuttle valve group 9 and carries out pressure inspection
Rope, pilot pressure feeds back to auxiliary pump feedback port Px2, makes auxiliary pump 4 output pressure to bucket cylinder 18 fuel feeding；
3), after machine hand operation dipper handle 6 action, guide oil that pioneer pump 5 is confessed passes through the switching of dipper handle 6, and one
Branch road enters total shuttle valve 7 and carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve 2, and bucket rod valve 2 is cut
Change；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group 9 is cut-off, therefore auxiliary pump 4 is not to bucket arm cylinder 1 fuel feeding, first
Pilot power only by the pressure retrieval of main pump shuttle valve group 8, feeds back to main pump feedback port Px1, makes main pump 3 output pressure to dipper oil
Cylinder 1 fuel feeding,
5), utilize the alternating power control principle of main pump 3 and auxiliary pump 4, so that the flow of main pump 3 is increased, until meeting dipper
The demand of oil cylinder 1, realizes composite move operating mode and places an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve 11 only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5
The pressure of mouth.The flow of main pump 3 and auxiliary pump 4 depends on the aperture of scraper bowl valve element, that is, depend on the guide that scraper bowl handle 20 applies
Pressure.
As shown in figure 5, the control method of excavator boom action hydraulic control system, when " dipper action+scraper bowl unloading 0
～100% ", during action, comprise the following steps：
1), after machine hand operation scraper bowl handle 20 uninstall action, the scraper bowl unloading retrieval by scraper bowl shuttle valve 13 for the pilot pressure
End retrieves pressure signal, acts in the switch terminal of two position three way directional control valve 11 through main shuttle valve 12, and switching two-position three way changes
Cut off the pressure retrieval of auxiliary pump shuttle valve group 9 to valve 11, make auxiliary pump feedback port Px2 no pressure and not to bucket arm cylinder 1 fuel feeding；
2), the guide oil that pioneer pump 5 is confessed passes through the switching of scraper bowl handle 20, and a branch road enters first connecting of bucket valve 19
Mouthful, bucket valve 19 is switched over；Another branch road enters main pump shuttle valve group 8 and carries out pressure retrieval, and pilot pressure feeds back to main pump
Feedback port Px1, makes main pump 3 output pressure to bucket cylinder 18 fuel feeding；Another branch road enters auxiliary pump shuttle valve group 9 and carries out pressure inspection
Rope, pilot pressure feeds back to auxiliary pump feedback port Px2, makes auxiliary pump 4 output pressure to bucket cylinder 18 fuel feeding；
3), after machine hand operation dipper handle 6 action, guide oil that pioneer pump 5 is confessed passes through the switching of dipper handle 6, and one
Branch road enters total shuttle valve 7 and carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve 2, and bucket rod valve 2 is cut
Change；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group 9 is cut-off, therefore auxiliary pump 4 is not to bucket arm cylinder 1 fuel feeding, first
Pilot power only by the pressure retrieval of main pump shuttle valve group 8, feeds back to main pump feedback port Px1, makes main pump 3 output pressure to dipper oil
Cylinder 1 fuel feeding,
5), utilize the alternating power control principle of main pump 3 and auxiliary pump 4, so that the flow of main pump 3 is increased, until meeting dipper
The demand of oil cylinder 1, realizes composite move operating mode and places an order pump to dipper fuel feeding.
The commutation pressure of two position three way directional control valve 11 only needs to more than 5bar, just can cut off guide oil to auxiliary pump shuttle valve group A5
The pressure of mouth.The flow of main pump 3 and auxiliary pump 4 depends on the aperture of scraper bowl valve element, that is, depend on the guide that scraper bowl handle 20 applies
Pressure.
, under dipper with the operating mode of other composite moves, cut-out is first for this excavator boom action hydraulic control system and method
Pilot power feeds back to the pressure of auxiliary pump feedback port by auxiliary pump shuttle valve group, makes single pump to bucket arm cylinder fuel feeding, and using two pumps
Alternating power control principle, makes the flow of main pump increase, and meets the demand of bucket arm cylinder, thus solve the stream that auxiliary pump is confessed
The problem that amount is too much and no road discharges, also just solving excavator and produces high pressure the phenomenon generated heat, thus reducing oil consumption, carrying
High operating efficiency；In addition, also this purpose can be reached by arranging solenoid valve system, that is, in the work of dipper and other composite moves
Under condition, by the auxiliary pump of solenoid valve control not to bucket arm cylinder fuel feeding, only make main pump to bucket arm cylinder fuel feeding, realize under composite move
The effect of single oil pump feed.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Although more employing bucket arm cylinder 1 herein；Bucket rod valve 2；Main pump 3；Auxiliary pump 4；Pioneer pump 5；Dipper handle 6；
Total shuttle valve 7；Main pump shuttle valve group 8；Auxiliary pump shuttle valve group 9；Dipper converging valve 10；Two position three way directional control valve 11；Main shuttle valve 12；Scraper bowl shuttle
Valve 13；Swing arm shuttle valve 14；Boom cylinder 15；Boom valve 16；Swing arm handle 17；Bucket cylinder 18；Bucket valve 19；Scraper bowl handle 20
Deng term, but it is not precluded from the possibility using other terms.It is used for the purpose of more easily description using these terms to conciliate
Release the essence of the present invention；Being construed as any additional restriction is all to disagree with spirit of the present invention.
Claims (9)
1. excavator boom action hydraulic control system, including bucket arm cylinder, boom cylinder, bucket cylinder, main pump, auxiliary pump and elder generation
Lead pump it is characterised in that described bucket arm cylinder connects dipper oil circuit, described dipper oil circuit concatenates bucket rod valve, described main pump is straight
Connect bucket rod valve in succession, between described auxiliary pump and bucket rod valve, concatenate dipper converging valve；Described boom cylinder connects swing arm oil circuit, described
Boom valve is concatenated on swing arm oil circuit, described main pump and auxiliary pump are directly connected to boom valve；Described bucket cylinder connects scraper bowl oil circuit, institute
State concatenation bucket valve on scraper bowl oil circuit, described main pump and auxiliary pump are directly connected to bucket valve；
Also include dipper handle, swing arm handle and scraper bowl handle, described pioneer pump connects dipper handle by guide's oil circuit, described
Dipper handle passes through to execute oil circuit connection bucket rod valve, retrieves valve group by detecting that oil circuit connects pressure, described pressure retrieves valve group
The first bars branch road connect the feedback port of main pump, Article 2 signal branch acts on the switch terminal of dipper converging valve, the 3rd
Bars branch road connects the feedback port of auxiliary pump, concatenation two position three way directional control valve in described Article 3 signal branch, described two three
In the switch terminal of logical reversal valve, effect has pressure oil circuit, and described pressure oil circuit connects composite move retrieval valve group；
Described pioneer pump connects swing arm handle by guide's oil circuit, and described swing arm handle passes through to execute oil circuit connection boom valve, leads to
Cross detection oil circuit and connect pressure retrieval valve group, described pressure retrieves the feedback port of the first bars branch road connection main pump of valve group,
Article 3 signal branch connects the feedback port of auxiliary pump；
Described pioneer pump connects scraper bowl handle by guide's oil circuit, and described scraper bowl handle passes through to execute oil circuit connection bucket valve, leads to
Cross detection oil circuit and connect pressure retrieval valve group, described pressure retrieves the feedback port of the first bars branch road connection main pump of valve group,
Article 3 signal branch connects the feedback port of auxiliary pump；
Described main pump is connected by oil circuit with auxiliary pump.
2. excavator boom action hydraulic control system according to claim 1 is it is characterised in that described pressure retrieves valve
Group includes total shuttle valve, main pump shuttle valve group, auxiliary pump shuttle valve group, and described total shuttle valve connects Article 2 signal branch and acts on dipper interflow
The switch terminal of valve, described main pump shuttle valve group passes through the feedback port that the first bars branch road connects main pump, and described auxiliary pump shuttle valve group is led to
Cross the feedback port that Article 3 signal branch connects auxiliary pump.
3. excavator boom action hydraulic control system according to claim 1 is it is characterised in that described composite move is examined
Rope valve group includes main shuttle valve, scraper bowl shuttle valve and swing arm shuttle valve, and described scraper bowl shuttle valve has scraper bowl and excavates retrieval end and scraper bowl unloading
Retrieval end, described swing arm shuttle valve has swing arm and rises retrieval end and swing arm decline retrieval end, described scraper bowl shuttle valve and swing arm shuttle valve
It is all connected with main shuttle valve, described main shuttle valve is acted in the switch terminal of two position three way directional control valve by pressure oil circuit.
4. excavator boom action hydraulic control system according to claim 1 is it is characterised in that described main pump, auxiliary pump
And pioneer pump is all by oil communication fuel tank.
5. according to claim 1 the control method of excavator boom action hydraulic control system it is characterised in that working as dipper
During single movement, comprise the following steps：
1), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, and a branch road enters
Total shuttle valve carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
2), after the pressure of total shuttle valve is retrieved, first, the pressure retrieval by main pump shuttle valve group for the pilot pressure, feeds back to master
Pump feedback port, makes main pump output pressure fuel feeding；Second, pilot pressure accesses the first waveguide interface of dipper converging valve, and switching dipper closes
Stream valve connection dipper oil circuit；Three, pilot pressure accesses two position three way directional control valve by the first waveguide interface of dipper converging valve, further
It is connected to auxiliary pump shuttle valve group and carries out pressure retrieval, feed back to auxiliary pump feedback port, make auxiliary pump output pressure fuel feeding；
3), the hydraulic oil of main pump output feeds bucket arm cylinder by bucket rod valve, and the hydraulic oil of auxiliary pump output passes through dipper converging valve
Conflux with the hydraulic oil of main pump afterwards, together feed bucket arm cylinder through bucket rod valve, realize the double pump under dipper single movement operating mode
Interflow function.
6. the control method of excavator boom action hydraulic control system " struggles against it is characterised in that working as according to claim 1
During bar action+swing arm decline 0～100% " action, comprise the following steps：
1), after machine hand operation swing arm handle down maneuver, pilot pressure declines retrieval end by the swing arm of swing arm shuttle valve and retrieves
Pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve is auxiliary to cut off
The pressure retrieval of pump shuttle valve group, make auxiliary pump feedback port no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of swing arm handle, is directly entered the first waveguide interface of boom valve, to boom valve
Switch over；Do not pass through the pressure retrieval of main pump shuttle valve group, make main pump feedback port no pressure and not to boom cylinder fuel feeding；Obstructed
Cross the pressure retrieval of auxiliary pump shuttle valve group, make auxiliary pump feedback port no pressure not increase fuel feeding to boom cylinder；Boom cylinder relies on
Regeneration function, and the minimum injection rate fuel feeding of auxiliary pump, realize swing arm and decline；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, and a branch road enters
Total shuttle valve carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, pilot pressure
Only by the pressure retrieval of main pump shuttle valve group, feed back to main pump feedback port, make main pump output pressure to bucket arm cylinder fuel feeding,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting the need of bucket arm cylinder
Ask, realize composite move operating mode and place an order pump to dipper fuel feeding.
7. the control method of excavator boom action hydraulic control system " struggles against it is characterised in that working as according to claim 1
During bar action+swing arm rising 0～100% " action, comprise the following steps：
1), after machine hand operation swing arm handle vertical motion, pilot pressure rises retrieval end by the swing arm of swing arm shuttle valve and retrieves
Pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve cuts off auxiliary pump
The pressure retrieval of shuttle valve group, make auxiliary pump feedback port no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of swing arm handle, and a branch road enters the first waveguide interface of boom valve, to swing arm
Valve switches over；Another branch road enters main pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to main pump feedback port, makes main pump
Output pressure is to boom cylinder fuel feeding；Another branch road enters auxiliary pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to auxiliary pump
Feedback port, makes auxiliary pump output pressure to boom cylinder fuel feeding；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, and a branch road enters
Total shuttle valve carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, pilot pressure
Only by the pressure retrieval of main pump shuttle valve group, feed back to main pump feedback port, make main pump output pressure to bucket arm cylinder fuel feeding,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting the need of bucket arm cylinder
Ask, realize composite move operating mode and place an order pump to dipper fuel feeding.
8. the control method of excavator boom action hydraulic control system " struggles against it is characterised in that working as according to claim 1
During bar action+scraper bowl excavation 0～100% " action, comprise the following steps：
1), after machine hand operation scraper bowl handle excavation action, pilot pressure excavates retrieval end by the scraper bowl of scraper bowl shuttle valve and retrieves
Pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve cuts off auxiliary pump
The pressure retrieval of shuttle valve group, make auxiliary pump feedback port no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of scraper bowl handle, and a branch road enters the first waveguide interface of bucket valve, to scraper bowl
Valve switches over；Another branch road enters main pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to main pump feedback port, makes main pump
Output pressure is to bucket cylinder fuel feeding；Another branch road enters auxiliary pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to auxiliary pump
Feedback port, makes auxiliary pump output pressure to bucket cylinder fuel feeding；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, and a branch road enters
Total shuttle valve carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, pilot pressure
Only by the pressure retrieval of main pump shuttle valve group, feed back to main pump feedback port, make main pump output pressure to bucket arm cylinder fuel feeding,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting the need of bucket arm cylinder
Ask, realize composite move operating mode and place an order pump to dipper fuel feeding.
9. the control method of excavator boom action hydraulic control system " struggles against it is characterised in that working as according to claim 1
During bar action+scraper bowl unloading 0～100% " action, comprise the following steps：
1), after machine hand operation scraper bowl handle uninstall action, pilot pressure is retrieved by the scraper bowl unloading retrieval end of scraper bowl shuttle valve
Pressure signal, in the switch terminal that main shuttle valve acts on two position three way directional control valve, switching two position three way directional control valve cuts off auxiliary pump
The pressure retrieval of shuttle valve group, make auxiliary pump feedback port no pressure and not to bucket arm cylinder fuel feeding；
2), the guide oil that pioneer pump is confessed passes through the switching of scraper bowl handle, and a branch road enters the first waveguide interface of bucket valve, to scraper bowl
Valve switches over；Another branch road enters main pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to main pump feedback port, makes main pump
Output pressure is to bucket cylinder fuel feeding；Another branch road enters auxiliary pump shuttle valve group and carries out pressure retrieval, and pilot pressure feeds back to auxiliary pump
Feedback port, makes auxiliary pump output pressure to bucket cylinder fuel feeding；
3), after machine hand operation dipper handle action, the guide oil that pioneer pump is confessed passes through the switching of dipper handle, and a branch road enters
Total shuttle valve carries out pressure retrieval, and another branch road is directly entered the first waveguide interface of bucket rod valve, and bucket rod valve is switched over；
4), because of step 1) in, the pressure retrieval of auxiliary pump shuttle valve group is cut-off, therefore auxiliary pump is not to bucket arm cylinder fuel feeding, pilot pressure
Only by the pressure retrieval of main pump shuttle valve group, feed back to main pump feedback port, make main pump output pressure to bucket arm cylinder fuel feeding,
5), utilize the alternating power control principle of main pump and auxiliary pump, so that the flow of main pump is increased, until meeting the need of bucket arm cylinder
Ask, realize composite move operating mode and place an order pump to dipper fuel feeding.
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| CN201410851021.4A CN104674867B (en) | 2014-12-31 | 2014-12-31 | Hydraulic control system and hydraulic control method for action of bucket rod of excavator |
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| CN201410851021.4A CN104674867B (en) | 2014-12-31 | 2014-12-31 | Hydraulic control system and hydraulic control method for action of bucket rod of excavator |
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| CN107806320B (en) * | 2017-11-28 | 2023-08-15 | 恒天九五重工有限公司 | Main pump auxiliary pump confluence control system and control method of rotary drilling rig |
| CN115404939B (en) * | 2022-09-29 | 2023-09-29 | 三一重机有限公司 | Control method and device of hydraulic system, hydraulic system and excavator |
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| KR100581823B1 (en) * | 2001-12-21 | 2006-05-23 | 현대중공업 주식회사 | Arm cylinder flow regeneration control system for excavator |
| KR100656046B1 (en) * | 2002-11-25 | 2006-12-08 | 두산인프라코어 주식회사 | Apparatus for controlling arm speed in a miniature excavator |
| JP5572586B2 (en) * | 2011-05-19 | 2014-08-13 | 日立建機株式会社 | Hydraulic drive device for work machine |
| JP6015157B2 (en) * | 2011-07-01 | 2016-10-26 | コベルコ建機株式会社 | Construction machinery |
| CN102561449B (en) * | 2011-12-22 | 2014-11-19 | 青岛雷沃挖掘机有限公司 | Automatic boosting device and automatic boosting method for excavator |
| CN202519716U (en) * | 2011-12-31 | 2012-11-07 | 中外合资沃得重工（中国）有限公司 | Excavator scarper pan hydraulic system with confluence accelerating function |
| CN102828536B (en) * | 2012-09-18 | 2015-01-14 | 三一重机有限公司 | Excavator convergent flow control system and excavator |
| CN103882897A (en) * | 2012-12-20 | 2014-06-25 | 青岛鲁达工程机械制造有限公司 | Loader hydraulic system |
| JP6220131B2 (en) * | 2013-02-01 | 2017-10-25 | ナブテスコ株式会社 | Hydraulic control system and construction machinery equipped with the hydraulic control system |
| CN103498491B (en) * | 2013-09-29 | 2015-08-19 | 山河智能装备股份有限公司 | A kind of dipper prior control loop of excavator and control method thereof |
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