CN101929177A - Be used for hydraulic control system of excavator - Google Patents
Be used for hydraulic control system of excavator Download PDFInfo
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- CN101929177A CN101929177A CN201010204298XA CN201010204298A CN101929177A CN 101929177 A CN101929177 A CN 101929177A CN 201010204298X A CN201010204298X A CN 201010204298XA CN 201010204298 A CN201010204298 A CN 201010204298A CN 101929177 A CN101929177 A CN 101929177A
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- control valve
- hydraulic
- hydraulic pump
- swing arm
- equipment
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2282—Systems using center bypass type changeover valves
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31588—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and multiple output members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/75—Control of speed of the output member
Abstract
A kind of excavator hydraulic circuit comprises: at least one first equipment control valve has from the downstream of first hydraulic pump first the advance control valve and the first swing arm control valve of installing in succession along the first central bypass line; At least one second equipment control valve has from the downstream of second hydraulic pump second the advance control valve and the second swing arm control valve of installing in succession along the second central bypass line; The 3rd hydraulic pump is for the rotary motor that is installed on the 3rd central bypass line provides fluid pressure; Rotary control valve is installed in the downstream of the 3rd hydraulic pump, is fed to rotary motor according to the valve switching signal conversion of outside input with the hydraulic fluid with the 3rd hydraulic pump; With the swing arm pipeline that confluxes, connection also is installed between rotary control valve output port and the swing arm control valve input port, when changing, make the hydraulic fluid interflow of the hydraulic fluid of the 3rd hydraulic pump by the 3rd central bypass line and swing arm control valve input oral-lateral with direction at the swing arm control valve.
Description
The cross reference of related application
Present patent application is based on the korean patent application No.10-2009-0055443 that submitted in Korea S Department of Intellectual Property on June 22nd, 2009 and advocate its priority, and its full content is incorporated this paper into through quoting.
Technical field
The present invention relates to a kind of hydraulic control system that is used for the independent swinging of having of excavator (swing-independent) hydraulic circuit.More particularly, the present invention relates to a kind of hydraulic control system that is used for the improved independent swinging hydraulic circuit of being provided with of excavator, this hydraulic control system can be controlled rotary motor independently, and when being driven such as equipments such as swing arm, dippers compoundly, can collaborate with the hydraulic fluid in the equipment by making, and effectively utilize the fluid power of gyroscopic drive system from the hydraulic fluid of revolution hydraulic pump supply.
Background technology
In such as heavy construction equipments such as excavator, loaders, for effectively the horsepower or the fluid pressure of control motor have carried out various trials, operating under revolving structure and the situation such as the equipment of swing arm, dipper or scraper bowl compoundly, requirement should be controlled motor effectively, also controlled hydraulic system effectively.
Openly be used for the typical hydraulic control system that having of excavator is used to connect the loop of confluxing of hydraulic pump, moving device and equipment.For service speed and the maneuverability that improves each equipment, the loop of confluxing makes hydraulic fluid and the interflow of the hydraulic fluid in the equipment in the hydraulic pump that is connected to moving device, so hydraulic circuit becomes complicated.
Fig. 1 is the view of indicative icon as traditional excavator of heavy construction equipment, and Fig. 2 is the view of structure of the hydraulic system of indicative icon excavator shown in Figure 1.
According to excavator shown in Figure 1, last revolving structure 1 is installed in down on the top of drives structure 2, and the equipment that the driver's cabin 3 that is positioned at engine room 4 the place aheads is installed and comprises swing arm 5, dipper 6 and scraper bowl 7 on last revolving structure 1.
Typically, motor, radiator, radiator fan, oil cooler and oil cooler fan are installed in engine room 4, and are used for the rotation by motor of the main pump of process oil cooler fan and radiator fan and little pump from hydraulic fluid tank T aspirated liquid hydraulic fluid.And a plurality of actuators that comprise boom cylinder 9, bucket arm cylinder 11, bucket cylinder 13, rotary motor etc. are by the fluid pressure actuated from hydraulic pump 201 and 206 hydraulic fluids of discharging.
Referring to Fig. 2, first hydraulic pump 201 is fed to first advance control valve 202, the first swing arm control valve 203, first rotary control valve 204 and the first dipper control valve 205 with hydraulic fluid.
And second hydraulic pump 206 is fed to second advance control valve 207, the second swing arm control valve 208, the second scraper bowl control valve 209 and the second dipper control valve 210 with hydraulic fluid.Therefore, first advance control valve 202 according to advancing control valve 207 according to fluid pressure control right side travel motor 212 from 206 supplies of second hydraulic pump from the fluid pressure control left side travel motor 211, the second of first hydraulic pump, 201 supplies.Bucket cylinder 13 is by 209 controls of the second scraper bowl control valve, and boom cylinder 9 is by each swing arm control valve 203 and 208 controls, and bucket arm cylinder 11 is by each dipper control valve 205 and 210 controls.
In utilizing the hydraulic circuit in parallel of above-mentioned two hydraulic pumps, hydraulic fluid flows to the higher side of resistance that is caused by fluid pressure, and therefore relatively low fluid pressure occurs in having the loop of higher drag.Therefore, under the situation of operating rotary motor and dipper or rotary motor and swing arm, thereby actuator can not operated the actuating speed that reduces actuator reposefully compoundly.
Especially, if at the needs fluid pressure with when turning round operation, the actuator that is used for another equipment is driven, thus the fluid pressure that then is applied to rotary motor reduces to reduce initial speed of gyration.Therefore, in order to carry out effective composition operation, needing a kind ofly provides the revolution stand alone type hydraulic control system of fluid pressure by independent hydraulically controlled pump, makes rotary motor not be subjected to the influence of other actuator.
Yet as shown in Figure 3, the free-standing hydraulic control system of tradition revolution has following shortcoming, though promptly improved the performance of revolution composition operation by independent control rotary motor 204, lower for control flow or engine horsepower efficient.That is to say that because rotary motor 204 does not use, therefore the 3rd hydraulic pump 213 is in idling conditions, and this causes the flow-control performance degradation under the situation of carrying out dredge operation.
In addition, though carry out retainability energy under the situation of composition operation respectively by first and second hydraulic pumps at swing arm, dipper etc., but under the situation that rotary motor or swing arm or rotary motor and dipper are operated compoundly, can not use the fluid pressure of the 3rd hydraulic pump to be used for actuator.
Summary of the invention
Therefore, the present invention is devoted to solve the above-mentioned problems in the prior art, the advantage that simultaneously keeps prior art fully and obtained.
The present invention's purpose to be achieved provides a kind of hydraulic control system that is used for the independent swinging hydraulic circuit of having of excavator, this hydraulic control system can be controlled rotary motor independently, and has also improved the compound maneuvering performance of equipment by the fluid pressure that utilization is used to turn round the hydraulic pump of operation.
In order to realize this purpose, according to embodiment of the present invention, provide a kind of hydraulic control system of excavator that is used for, excavator comprises revolving structure; Following drives structure; First and second hydraulic pumps, first and second hydraulic pumps provide fluid pressure for a plurality of equipment actuators, the equipment actuator comprises boom cylinder, bucket arm cylinder, bucket cylinder and the rotary motor that is installed on the revolving structure, hydraulic control system comprises: at least one first equipment control valve, and it has from the downstream of first hydraulic pump first the advance control valve and the first swing arm control valve of installing in succession along the first central bypass line; At least one second equipment control valve, it has from the downstream of second hydraulic pump second the advance control valve and the second swing arm control valve of installing in succession along the second central bypass line; The 3rd hydraulic pump, it provides fluid pressure for the rotary motor that is installed on the 3rd central bypass line; Rotary control valve, it is installed on the downstream of the 3rd hydraulic pump, and according to the valve switching signal conversion from the outside input, being fed to rotary motor from the hydraulic fluid that the 3rd hydraulic pump is discharged; And the swing arm pipeline that confluxes, its connection and be installed in the output port of rotary control valve and the input port of swing arm control valve between, when changing, make the hydraulic fluid interflow of passing through the input oral-lateral of the 3rd central bypass line and swing arm control valve from the hydraulic fluid of the 3rd hydraulic pump discharge with direction at the swing arm control valve.
In the hydraulic control system of excavator that is used for according to embodiment of the present invention, the swing arm pipeline that confluxes is connected to and is installed on the input port and the fluid path between second hydraulic pump of the second swing arm control valve.
In another aspect of this invention, according to embodiment of the present invention, provide a kind of hydraulic control system of excavator that is used for, excavator comprises revolving structure; Following drives structure; First and second hydraulic pumps, first and second hydraulic pumps provide fluid pressure for a plurality of equipment actuators, the equipment actuator comprises boom cylinder, bucket arm cylinder, bucket cylinder and the rotary motor that is installed on the revolving structure, hydraulic control system comprises: at least one first equipment control valve, and it has from the downstream of first hydraulic pump first the advance control valve and the first swing arm control valve of installing in succession along the first central bypass line; At least one second equipment control valve, it has from the downstream of second hydraulic pump second the advance control valve and the second swing arm control valve of installing in succession along the second central bypass line; The 3rd hydraulic pump, it provides fluid pressure for the rotary motor that is installed on the 3rd central bypass line; Rotary control valve, it is installed on the downstream of the 3rd hydraulic pump, and according to the valve switching signal conversion from the outside input, being fed to rotary motor from the hydraulic fluid that the 3rd hydraulic pump is discharged; Control valve confluxes, it is connected to and is installed on the fluid path between in rotary control valve and the equipment control valve at least one, wherein rotary control valve is installed on the 3rd central bypass line of the 3rd hydraulic pump downstream part, the equipment control valve is connected to the first and second central bypass lines, and the control valve that confluxes is according to changing from the valve switching signal of outside input when rotary control valve mediates, will be fed at least one the equipment control valve that optionally connects from the hydraulic fluid that the 3rd hydraulic pump is discharged; And the variable pipeline that confluxes, its connection and be installed in the output oral-lateral of the control valve that confluxes and the equipment control valve that optionally connects at least one between, with spool conversion, make hydraulic fluid and the interflow of the hydraulic fluid in first or second hydraulic pump from the supply of the 3rd hydraulic pump according to the control valve that confluxes.
In the hydraulic control system of excavator that is used for of another embodiment according to the present invention, the variable pipeline that confluxes is connected to and is installed on the output port and the fluid path between the bucket arm cylinder of the second dipper control valve.
Another embodiment is used for hydraulic control system of excavator and also can comprises the scraper bowl control valve according to the present invention, the scraper bowl control valve is connected to and is installed in the fluid path that branches out from the second central bypass line in the downstream of second hydraulic pump, and, control the hydraulic fluid that is supplied to bucket cylinder of second hydraulic pump according to valve switching signal from the outside input.
Utilize above-mentioned structure, the hydraulic control system of excavator that is used for according to embodiment of the present invention can be by means of controlling rotary motor independently by the fluid pressure of the 3rd hydraulic pump supply, and in revolution composition operation process, by make from the hydraulic fluid of the hydraulic pump that is used to turn round operation with from hydraulic fluid interflow such as equipments such as swing arm, dippers, keep the speed of actuator, and underfed can not occur.
Description of drawings
Above-mentioned and other purpose will be clearer from following detailed description in conjunction with the accompanying drawings of the present invention, feature and advantage, in the accompanying drawing:
Fig. 1 is the view that schematically illustrates the excavator of prior art;
Fig. 2 is the loop diagram of the double pump type hydraulic circuit that excavator adopts usually in the prior art;
Fig. 3 is the loop diagram that is used for the independent swinging hydraulic system of excavator in the prior art;
Fig. 4 is the loop diagram according to the hydraulic control system of confluxing with the swing arm control valve that is used for excavator of embodiment of the present invention; And
Fig. 5 is the loop diagram of the hydraulic control system of confluxing with the dipper control valve that is used for excavator of another embodiment according to the present invention.
The specific embodiment
Hereinafter, preferred implementation of the present invention is described with reference to the accompanying drawings.Object defined in this is described, for example detailed construction and element only provide and are used for subsidiary book those skilled in the art complete understanding detail of the present invention, and therefore the present invention is not limited thereto.Referenced drawings label identical among each figure is used to indicate components identical.
Fig. 1 is the view that schematically illustrates the excavator of prior art; Fig. 2 is the loop diagram of the double pump type hydraulic circuit that excavator adopts usually in the prior art; And Fig. 3 is the loop diagram that is used for the independent swinging hydraulic system of excavator in the prior art.Fig. 4 is the loop diagram according to the hydraulic control system of confluxing with the swing arm control valve that is used for excavator of embodiment of the present invention; And Fig. 5 is the loop diagram of the hydraulic control system of confluxing with the dipper control valve that is used for excavator of another embodiment according to the present invention.
In the accompanying drawings, reference number " 36 " indicates the swing arm fluid path that confluxes, and " 401 " indicate the 3rd hydraulic pump, and " 402 " indicate rotary control valve, and " 403 " indicate rotary motor, and " 501 " indicate the control valve that confluxes.The equipment control valve is the term that limits Hydraulic Elements, and the hydraulic fluid that described Hydraulic Elements control is discharged from hydraulic pump is used for the actuator of the equipment of typical heavy construction equipment with control, and equipment comprises swing arm, dipper, scraper bowl, quartering hammer etc.
As shown in Figure 4, according to embodiment of the present invention, a kind of hydraulic control system of excavator that is used for is provided, excavator comprises revolving structure 1, following drives structure 2 and first and second hydraulic pumps 301 and 306, first and second hydraulic pumps 301 and 306 provide fluid pressure for a plurality of equipment actuators, the equipment actuator comprises the boom cylinder 9 that is installed on the revolving structure 1, bucket arm cylinder 11, bucket cylinder 13 and rotary motor 403, above-mentioned hydraulic control system comprises: at least one first equipment control valve 303,304 and 305, it has from the downstream of first hydraulic pump 301 first the advance control valve 302 and the first swing arm control valve of installing in succession along the first central bypass line 20 303; At least one second equipment control valve 309 and 310, it has from the downstream of second hydraulic pump 306 second the advance control valve 307 and the second swing arm control valve of installing in succession along the second central bypass line 30 308; The 3rd hydraulic pump 401, it provides fluid pressure for the rotary motor 403 that is installed on the 3rd central bypass line 40; Rotary control valve 402, it is installed in the downstream of the 3rd hydraulic pump 401, and according to the valve switching signal conversion from the outside input, being fed to rotary motor 403 from the hydraulic fluid that the 3rd hydraulic pump 401 is discharged; And the swing arm pipeline 36 that confluxes, its connection and be installed in the output port of rotary control valve 402 and the input port of swing arm control valve 308 between, when changing, the hydraulic fluid of discharging from the 3rd hydraulic pump 401 is collaborated by the hydraulic fluid of the 3rd central bypass line 40 with the input oral-lateral of swing arm control valve 308 with direction at the swing arm control valve.
And, as shown in Figure 5, according to embodiment of the present invention, a kind of hydraulic control system of excavator that is used for is provided, excavator comprises revolving structure 1, following drives structure 2 and first and second hydraulic pumps 301 and 306, first and second hydraulic pumps 301 and 306 provide fluid pressure for a plurality of equipment actuators, the equipment actuator comprises the boom cylinder 9 that is installed on the revolving structure 1, bucket arm cylinder 11, bucket cylinder 13 and rotary motor 403, above-mentioned hydraulic control system comprises: at least one first equipment control valve 303,304 and 305, it has from the downstream of first hydraulic pump 301 first the advance control valve 302 and the first swing arm control valve of installing in succession along the first central bypass line 20 303; At least one second equipment control valve 309 and 310, it has from the downstream of second hydraulic pump 306 second the advance control valve 307 and the second swing arm control valve of installing in succession along the second central bypass line 30 308; The 3rd hydraulic pump 401, it provides fluid pressure for the rotary motor 403 that is installed on the 3rd central bypass line 40; Rotary control valve 402, it is installed in the downstream of the 3rd hydraulic pump 401, and according to the valve switching signal conversion from the outside input, being fed to rotary motor 403 from the hydraulic fluid that the 3rd hydraulic pump 401 is discharged; Control valve 501 confluxes, it is connected to and is installed in rotary control valve 402 and equipment control valve 303,304,305, on the fluid path between in 309 and 310 at least one, wherein rotary control valve 402 is installed on the 3rd central bypass line 40 of the 3rd hydraulic pump 401 downstream parts, equipment control valve 303,304,305,309 and 310 are connected to the first and second central bypass lines 20 and 30, and the control valve 501 that confluxes is according to changing from the valve switching signal of outside input when rotary control valve 402 mediates (neutral position), being fed to the equipment control valve 303 that optionally connects from the hydraulic fluid that the 3rd hydraulic pump 401 is discharged, 304,305, in 309 and 310 at least one; And variable pipeline 501a and the 501b of confluxing, its connection and be installed in the output oral-lateral of the control valve 501 that confluxes and the equipment control valve 303,304,305,309 and 310 that optionally connects at least one between, with spool conversion, make from the hydraulic fluid of the 3rd hydraulic pump 401 supplies and the hydraulic fluid interflow in first or second hydraulic pump 301 or 306 according to the control valve 501 that confluxes.
The hydraulic control system of excavator that is used for according to embodiment of the present invention also comprises: scraper bowl control valve 309, it is connected to and is installed in the fluid path 33d that branches out from the second central bypass line 30 in second hydraulic pump, 306 downstreams, and according to valve switching signal conversion, to control the hydraulic fluid that is supplied to bucket cylinder 13 of second hydraulic pump 306 from the outside input.
Preferably, the swing arm pipeline 36 that confluxes is connected to and is installed on the input port and the fluid path 33b between second hydraulic pump 306 of the second swing arm control valve 308.
And preferably, variable pipeline 501a and the 501b of confluxing is connected to and is installed on the output port and the fluid path 27 between the bucket arm cylinder 11 of the second dipper control valve 310.Yet different modifications also is possible, so that the hydraulic fluid and the hydraulic fluid on bucket cylinder 13 or another equipment actuator one side of discharging from the 3rd hydraulic pump 401 collaborate.
In structure according to embodiment of the present invention, be installed between first hydraulic pump 301 and the first dipper control valve 305 from the branch fluid path 23 that the first central bypass line 20 branches out, and branch fluid path 23 is connected to and is installed on a plurality of fluid path 23a, 23b and the 23c, and a plurality of fluid path 23a, 23b and 23c are connected respectively at least one the input side in the first equipment control valve 303,304 and 305 that comprises the first dipper control valve 305.
And, be installed between second hydraulic pump 306 and the second dipper control valve 310 from the branch fluid path 33 that the second central bypass line 30 branches out, and branch fluid path 33 is connected to and is installed on a plurality of fluid path 33a, 33b, 33c and the 33d, and a plurality of fluid path 33a, 33b, 33c and 33d are connected respectively at least one the input oral-lateral in the second equipment control valve 307,308,309 and 310 that comprises the second dipper control valve 310.
Hereinafter, operation that is used for hydraulic control system of excavator and effect according to embodiment of the present invention are described with reference to the accompanying drawings.
At first, in the hydraulic control system of excavator that is used for according to the present invention, when the valve switching signal that provides from the outside of input when turning round operation, for example, if by pedal or control stick (not shown) input pilot signal, then the spool of rotary control valve 402 is transformed into left side or right side, and therefore carries out independent swinging hydraulic control, being provided to rotary motor 403 by fluid path 37 and 38 from the hydraulic fluid of the 3rd hydraulic pump 401.
As shown in Figure 4 according to the hydraulic control system of excavator that is used for of the present invention, therefore rotary motor 403 receives the hydraulic fluid from the 3rd hydraulic pump 401 individually, and makes independent swinging hydraulic control become feasible.At this moment, on the left of the spool conversion by advance control valve 302 and 307 control and the moving device 311 and 312 on right side, make them receive the hydraulic fluid of first hydraulic pump 301 and second hydraulic pump 306, and can not be subjected to the influence of the 3rd hydraulic pump 401.
Especially, be used in raising under the situation of speed of boom actuator of the lifting/landing of swing arm or shut-down operation, according to valve switching signal from the outside input, the first and second swing arm control valves 303 and 308 spool at first are transformed into left side or right side, as shown in the figure, according to the conversion of spool, be fed to big chamber or capacitor by fluid path 34 and 35 from the hydraulic fluid of first hydraulic pump 301 and second hydraulic pump 306.
At this moment, owing to be fed to the input port of the second swing arm control valve 308 from the centre position of rotary control valve 402 by the pipeline 36 that confluxes that is connected to the 3rd central bypass line 40 and fluid path 33b from the hydraulic fluid of the 3rd hydraulic pump 401, therefore collaborate together from the hydraulic fluid of second hydraulic pump 306 with from the hydraulic fluid of the 3rd hydraulic pump 401, thereby be supplied to boom cylinder 9, and the speed of actuator can be maintained at maximum, also is like this even produce heavy load.
Yet, though it is not shown, but be connected to and be installed at the pipeline 36 that confluxes under the situation on the input oral-lateral of the first swing arm control valve 303, hydraulic fluid from the 3rd hydraulic pump 401 is in the same place with the hydraulic fluid interflow from first hydraulic pump 301, and according to the spool of the first swing arm control valve 303 conversion is supplied to the big chamber and the capacitor of boom cylinder 9, thereby can improve actuator velocity.
According to the hydraulic control system of excavator that is used for of the present invention, when from outside transfer valve switching signal to turn round when operation, the spool of rotary control valve 402 is transformed into right side or left side, and the pipeline 36 that confluxes that is connected to the 3rd central bypass line 40 is blocked.At this moment, the hydraulic fluid of discharging from the 3rd hydraulic pump 401 is supplied to rotary motor 403 by fluid path 37 and 38, and therefore can control the operation of rotary motor 403 independently, and can not be subjected to the influence of first hydraulic pump 301 or second hydraulic pump 306.
Referring to Fig. 5, the hydraulic control system of excavator that is used for of according to the present invention another embodiment will be described now.
When the spool of the second dipper control valve 310 is transformed into left side or right side according to the valve switching signal from the outside input, the operation of control bucket arm cylinder 11.In this case, be supplied output port by being connected the second dipper control valve 310 and the fluid path 27 and 28 between the bucket arm cylinder 11 from the hydraulic fluid of second hydraulic pump 306.At this,, can improve the actuating speed of bucket arm cylinder 11 according to the spool conversion of the control valve 501 that confluxes.
That is to say, if rotary control valve 402 mediates, and the spool of the control valve 501 that confluxes is transformed into left side or right side according to the valve switching signal from the outside input, then from the hydraulic fluid of the 3rd hydraulic pump 401 by confluxing pipeline 501a and 501b and be connected the output port of the second dipper control valve 310 and the hydraulic fluid interflow in the fluid path 27 between the bucket arm cylinder 11 and 28, and be supplied to the big chamber and the capacitor of bucket arm cylinder 11.
Therefore, from the hydraulic fluid and the hydraulic fluid interflow of discharging from the 3rd hydraulic pump 401 of second hydraulic pump 306, therefore enough hydraulic fluids are supplied to bucket arm cylinder 11.The actuating speed of actuator can be maintained at maximum, and underfed or oscillatory occurences can not occur, also is like this even produce heavy load.
On the other hand, control valve 302 and 307 is according to changing from the valve switching signal of outside input if advance, then except the loop of confluxing according to the present invention, be supplied and be back to moving device 311 and 312 by fluid path 21,22,31 and 32 respectively from the hydraulic fluid of first hydraulic pump 301 with from the hydraulic fluid of second hydraulic pump 306, and therefore can the straight line of control appliance or advancing of left/right.And, under the situation that the revolution of control appliance is operated, hydraulic fluid from the 3rd hydraulic pump 401 is supplied to rotary motor 403 by fluid path 37 and 38, if and rotary control valve 402 and control valve 501 boths of confluxing are transformed into the centre position, then the hydraulic fluid from the 3rd hydraulic pump 401 is back to hydraulic fluid tank T.
In embodiments of the present invention, because operating principle is identical substantially with the operating principle of the typical hydraulic system that is used for heavy construction equipment, promptly the hydraulic fluid of discharging from second hydraulic pump 306 is changed according to the spool of scraper bowl control valve 309, be supplied to the big chamber or the capacitor of bucket cylinder 12 via fluid path 29a and 29b, and when the spool of scraper bowl control valve mediates, be back to hydraulic fluid tank T, therefore will omit its detailed description.
Though for illustrative purpose preferred implementation of the present invention described, it will be understood by those skilled in the art that under the situation that does not break away from the disclosed the scope and spirit of the present invention of claim scope, can carry out various modifications, interpolation and substitute.
Claims (5)
1. one kind is used for hydraulic control system of excavator, and described excavator comprises revolving structure; Following drives structure; First and second hydraulic pumps, described first and second hydraulic pumps provide fluid pressure for a plurality of equipment actuators, described equipment actuator comprises boom cylinder, bucket arm cylinder, bucket cylinder and the rotary motor that is installed on the described upward revolving structure, and described hydraulic control system comprises:
At least one first equipment control valve, described at least one first equipment control valve have from the downstream of described first hydraulic pump first the advance control valve and the first swing arm control valve of installing in succession along the first central bypass line;
At least one second equipment control valve, described at least one second equipment control valve have from the downstream of described second hydraulic pump second the advance control valve and the second swing arm control valve of installing in succession along the second central bypass line;
The 3rd hydraulic pump, described the 3rd hydraulic pump provides fluid pressure for the described rotary motor that is installed on the 3rd central bypass line;
Rotary control valve, described rotary control valve is installed on the downstream of described the 3rd hydraulic pump, and according to the valve switching signal conversion from the outside input, being fed to described rotary motor from the hydraulic fluid that described the 3rd hydraulic pump is discharged; And
The swing arm pipeline that confluxes, the described swing arm pipeline that confluxes connects and is installed between the input port of the output port of described rotary control valve and described swing arm control valve, when changing, make the hydraulic fluid interflow of passing through the input oral-lateral of the described the 3rd central bypass line and described swing arm control valve from the hydraulic fluid of described the 3rd hydraulic pump discharge with direction at described swing arm control valve.
2. hydraulic control system as claimed in claim 1, wherein, the described swing arm pipeline that confluxes is connected to and is installed on the input port and the fluid path between described second hydraulic pump of the described second swing arm control valve.
3. one kind is used for hydraulic control system of excavator, and described excavator comprises revolving structure; Following drives structure; First and second hydraulic pumps, described first and second hydraulic pumps provide fluid pressure for a plurality of equipment actuators, described equipment actuator comprises boom cylinder, bucket arm cylinder, bucket cylinder and the rotary motor that is installed on the described upward revolving structure, and described hydraulic control system comprises:
At least one first equipment control valve, described at least one first equipment control valve have from the downstream of described first hydraulic pump first the advance control valve and the first swing arm control valve of installing in succession along the first central bypass line;
At least one second equipment control valve, described at least one second equipment control valve have from the downstream of described second hydraulic pump second the advance control valve and the second swing arm control valve of installing in succession along the second central bypass line;
The 3rd hydraulic pump, described the 3rd hydraulic pump provides fluid pressure for the described rotary motor that is installed on the 3rd central bypass line;
Rotary control valve, described rotary control valve is installed on the downstream of described the 3rd hydraulic pump, and according to the valve switching signal conversion from the outside input, being fed to described rotary motor from the hydraulic fluid that described the 3rd hydraulic pump is discharged;
Control valve confluxes, the described control valve that confluxes is connected to and is installed on the fluid path between in described rotary control valve and the described equipment control valve at least one, wherein said rotary control valve is installed on the described the 3rd central bypass line of described the 3rd hydraulic pump downstream part, described equipment control valve is connected to the described first and second central bypass lines, and the described control valve that confluxes is according to changing from the valve switching signal of outside input when described rotary control valve mediates, will be fed at least one the described equipment control valve that optionally connects from the hydraulic fluid that described the 3rd hydraulic pump is discharged; And
The variable pipeline that confluxes, the described variable pipeline that confluxes connect and be installed in the output oral-lateral of the described control valve that confluxes and the described equipment control valve that optionally connects at least one between, with spool conversion, make hydraulic fluid and the interflow of the hydraulic fluid in described first or second hydraulic pump from described the 3rd hydraulic pump supply according to the described control valve that confluxes.
4. hydraulic control system as claimed in claim 3, wherein, the described variable pipeline that confluxes is connected to and is installed on the output port and the fluid path between the described bucket arm cylinder of the second dipper control valve.
5. as claim 1 or 3 described hydraulic control systems, also comprise the scraper bowl control valve, described scraper bowl control valve is connected to and is installed in the fluid path that branches out from the described second central bypass line in the downstream of described second hydraulic pump, and described scraper bowl control valve is controlled the hydraulic fluid that is supplied to described bucket cylinder of described second hydraulic pump according to the described valve switching signal conversion from the outside input.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20080063984 | 2008-07-02 | ||
| KR10-2009-0055443 | 2009-06-22 | ||
| KR1020090055443A KR101088753B1 (en) | 2008-07-02 | 2009-06-22 | hydraulic control system for excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101929177A true CN101929177A (en) | 2010-12-29 |
Family
ID=43566638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010204298XA Pending CN101929177A (en) | 2008-07-02 | 2010-06-21 | Be used for hydraulic control system of excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102704528A (en) * | 2012-06-26 | 2012-10-03 | 上海三一重机有限公司 | Excavator hydraulic system, control method for excavator hydraulic system and excavator |
| CN103502540A (en) * | 2011-05-02 | 2014-01-08 | 神钢建设机械株式会社 | Rotation-type working machine |
| CN103620233A (en) * | 2011-06-27 | 2014-03-05 | 沃尔沃建造设备有限公司 | Hydraulic control valve for construction machinery |
| CN103717914A (en) * | 2011-08-09 | 2014-04-09 | 沃尔沃建造设备有限公司 | Hydraulic control system for construction machinery |
| WO2014117592A1 (en) * | 2013-02-02 | 2014-08-07 | 江苏八达重工机械股份有限公司 | Dual-arm wheeled rescue machinery hydraulic system |
| CN104246086A (en) * | 2012-01-04 | 2014-12-24 | 派克汉尼芬公司 | Hydraulic hybrid swing drive system for excavators |
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| CN111102255A (en) * | 2018-10-29 | 2020-05-05 | 斗山英维高株式会社 | Travel control system for construction machine and travel control method for construction machine |
| CN111485590A (en) * | 2020-05-28 | 2020-08-04 | 三一重机有限公司 | Hydraulic control system, excavator and excavator control method |
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| CN103502540A (en) * | 2011-05-02 | 2014-01-08 | 神钢建设机械株式会社 | Rotation-type working machine |
| CN103620233A (en) * | 2011-06-27 | 2014-03-05 | 沃尔沃建造设备有限公司 | Hydraulic control valve for construction machinery |
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| CN102704528A (en) * | 2012-06-26 | 2012-10-03 | 上海三一重机有限公司 | Excavator hydraulic system, control method for excavator hydraulic system and excavator |
| WO2014117592A1 (en) * | 2013-02-02 | 2014-08-07 | 江苏八达重工机械股份有限公司 | Dual-arm wheeled rescue machinery hydraulic system |
| CN105917053A (en) * | 2014-01-23 | 2016-08-31 | 川崎重工业株式会社 | Hydraulic drive system |
| CN105917053B (en) * | 2014-01-23 | 2018-01-02 | 川崎重工业株式会社 | Fluid power system |
| CN105518311A (en) * | 2014-03-24 | 2016-04-20 | 日立建机株式会社 | Hydraulic system for work vehicle |
| CN107288945A (en) * | 2017-07-18 | 2017-10-24 | 山东临工工程机械有限公司 | Differentiation loading machine rotating bucket joins and auxiliary connection composite control hydraulic system |
| CN107288945B (en) * | 2017-07-18 | 2023-11-21 | 山东临工工程机械有限公司 | Differential loader rotating bucket coupling and auxiliary coupling composite control hydraulic system |
| CN112469865A (en) * | 2018-07-25 | 2021-03-09 | 克拉克设备公司 | Hydraulic bypass circuit for power machine |
| CN112469865B (en) * | 2018-07-25 | 2023-01-20 | 克拉克设备公司 | Hydraulic bypass circuit for power machine |
| CN111102255A (en) * | 2018-10-29 | 2020-05-05 | 斗山英维高株式会社 | Travel control system for construction machine and travel control method for construction machine |
| CN111102255B (en) * | 2018-10-29 | 2022-02-18 | 斗山英维高株式会社 | Travel control system for construction machine and travel control method for construction machine |
| CN112313381A (en) * | 2019-03-28 | 2021-02-02 | 日立建机株式会社 | Working machine |
| CN111485590A (en) * | 2020-05-28 | 2020-08-04 | 三一重机有限公司 | Hydraulic control system, excavator and excavator control method |
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Application publication date: 20101229 |