CN101107401A - Hydraulic drive device - Google Patents

Hydraulic drive device Download PDF

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Publication number
CN101107401A
CN101107401A CNA2006800030636A CN200680003063A CN101107401A CN 101107401 A CN101107401 A CN 101107401A CN A2006800030636 A CNA2006800030636 A CN A2006800030636A CN 200680003063 A CN200680003063 A CN 200680003063A CN 101107401 A CN101107401 A CN 101107401A
Authority
CN
China
Prior art keywords
mentioned
pressure oil
driver
corner
control valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2006800030636A
Other languages
Chinese (zh)
Inventor
高桥究
钓贺靖贵
川本纯也
伊藤健二
松井琢也
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Publication of CN101107401A publication Critical patent/CN101107401A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
    • E02F3/325—Backhoes of the miniature type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/963—Arrangements on backhoes for alternate use of different tools
    • E02F3/964—Arrangements on backhoes for alternate use of different tools of several tools mounted on one machine
    • 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
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • 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
    • E02F9/2285—Pilot-operated systems
    • 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
    • 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
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • 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
    • 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
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
    • 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
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30585—Assemblies of multiple valves having a single valve for multiple output members
    • 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
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/78—Control of multiple output members
    • F15B2211/781—Control of multiple output members one or more output members having priority

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

To drive a tilt cylinder and angle cylinder at a comparatively slow speed while driving an additional actuator at a high speed. [MEANS FOR SOLVING PROBLEMS] A hydraulic drive device includes a tilt cylinder (9) for rotating a blade (7) in the right-left directions and front-rear directions, an angle cylinder (10), an additional actuator (27) for operating an additional attachment, a tilt/angle pressure oil supply means having a tilt/angle direction control valve (19) for controlling the pressure oil flow supplied to one of cylinders (9, 10) and a selector valve (20) for supplying pressure oil flowing from the direction control valve (19) to one of the cylinders (9, 10), and additional actuator pressure oil supply means for supplying pressure oil to the additional actuator (27) independently from the tilt/angle pressure oil supply means. The additional actuator pressure oil supply means has an additional actuator direction control valve (29).

Description

Fluid pressure drive device
Technical field
The present invention relates to be arranged on the hydraulic crawler excavator, have the scraper plate hydraulic cylinder that makes scraper plate work, tilt, and have the fluid pressure drive device that appends driver that driving hydraulic breaker etc. appends annex with hydraulic cylinder, corner hydraulic cylinder.
Background technology
As this prior art the technology shown in the patent documentation 1 (spy opens the 2002-38534 communique) is arranged.Fig. 7 is the hydraulic circuit diagram of the existing fluid pressure drive device shown in this patent documentation 1 of expression.
The prior art has: make the scraper plate scraper plate hydraulic cylinder 8 of direction rotation up and down; Make the inclination hydraulic cylinder 9 of scraper plate direction rotation to the left and right; Make the corner hydraulic cylinder 10 of scraper plate direction rotation forwards, backwards; And drive that hydraulic breaker etc. appends annex append driver 27.
In addition, have first hydraulic pump 12, second hydraulic pump 13, auxiliary hydraulic pump 14, and have: be connected with second hydraulic pump 13, and control is to the scraper plate that the flows directional control valve 18 of the pressure oil of scraper plate hydraulic cylinder 18 supplies; The inclination that is connected with first hydraulic pump 12, corner directional control valve 19; And be located at and connect this inclinations, corner with directional control valve 19 with tilt with hydraulic cylinder 9, corner, and will supply with selectively from the pressure oil that tilts, corner flows out with directional control valve 19 and tilt to use hydraulic cylinder 9 and corner any selector valve 20 of hydraulic cylinder 10 with on pipeline 28a, the 28b of hydraulic cylinder 10.Have again, have another selector valve 20a connecting on this selector valve 20 and inclination, pipeline 28a, the 28b of corner with directional control valve 19, this selector valve 20a will from tilt, corner optionally supplies with selector valve 20 with the pressure oil of directional control valve 19 outflows and appends any of driver 27.At this selector valve 20a with append and have reversal valve 31 between the driver 27, this reversal valve 31 can disconnect, be communicated with the pipeline that connects selector valve 20a and append driver 27, makes to append driver 27 and be connected on the fuel tank 32 when disconnecting.In addition, selector valve 20a and scraper plate are connected by trochanter 24 with corresponding scraper plate hydraulic cylinder 8, selector valve 20 with directional control valve 18.
, constitute optionally with directional control valve 19, selector valve 20, selector valve 20a, reversal valve 31 by above-mentioned first hydraulic pump 12, inclination, corner to tilting with hydraulic cylinder 9 and corner with the oily feed unit of inclination, corner pressure of any supply pressure oil of hydraulic cylinder 10 with optionally append driver pressure oil feed unit to what append driver 27 supply pressure oil.
In addition, have: the conversion operations scraper plate pilot valve 25 of directional control valve 18; When inclination drives with hydraulic cylinder 10 with hydraulic cylinder 9 or corner, the pilot valve 26 that conversion operations tilts, corner is used directional control valve 19; And when appending driver 27 drivings, the pilot valve 30 that conversion operations tilts, corner is used directional control valve 19.From the secondary pressure of pilot valve 26 output with from any of the secondary pressure of pilot valve 30 outputs, offer the control room of inclinations, corner usefulness directional control valve 19 by shuttle valve 33a, 33b.
In addition, have: be connected with power supply 23, comprise switch 23a, relay 22 and electromagnetic valve 21, the electrical system that selector valve 20 is changed; And be connected with power supply 23, comprise switch 23b, relay 22a and electromagnetic valve 21a, 21b, another electrical system that selector valve 20a is changed.
Above-mentioned prior art since tilt, corner has between with directional control valve 19 and selector valve 20 optionally to another selector valve 20a that appends driver 27 supply pressure oil, therefore has the problem that the flow of supplying with the pressure oil that appends driver 27 is tilted, corner limits with directional control valve 19.Be the rotation of left and right directions and generally, preferably carry out with the speed of relatively mitigation by the i.e. rotation of direction forwards, backwards of corner operation of corner with the scraper plate of the work of hydraulic cylinder 10 by the tilt operation with the scraper plate of the work of hydraulic cylinder 9 of tilting.Relative therewith, make hydraulic breaker etc. the annex work of appending to append driver 27 many with the situation than speed drive faster.
Thereby, in the occasion that will tilt, corner is set smallerly with the ratio of the relative slide valve stroke of aperture area of directional control valve 19, from tilt, corner becomes low discharge according to the operation of pilot valve 26 with the flow of directional control valve 19 outflows, inclination, corner operation can be implemented well, but, the operating rate of appending driver 27 is slack-off, and the operability of appending the operation of annex by this utilization of appending work enforcement of driver 27 descends.
On the contrary, in the occasion that will tilt, corner is set greatlyyer with the ratio of the relative slide valve stroke of aperture area of directional control valve 19, from tilt, corner becomes big flow according to the operation of pilot valve 30 with the flow of directional control valve 19 outflows, can accelerate to append the operating rate of driver 27, can improve utilization and append the operability of the operation of appending annex of driver 27 drivings by this, but, inclination, corner operation are carried out rapidly, thereby are somebody's turn to do the operability decline of inclination, corner operation.
Summary of the invention
The present invention makes according to the actual conditions of above-mentioned prior art, and its purpose is to provide a kind of speed drive more slowly to tilt with hydraulic cylinder and corner hydraulic cylinder, and can fast driving appends the fluid pressure drive device of driver.
In order to achieve the above object, fluid pressure drive device of the present invention has makes the scraper plate scraper plate hydraulic cylinder of direction rotation up and down, make the inclination hydraulic cylinder of above-mentioned scraper plate direction rotation to the left and right, make the corner hydraulic cylinder of above-mentioned scraper plate direction rotation forwards, backwards, and make the driver that appends that appends annex work; And have inclination, corner pressure oil feed unit, this inclination, corner pressure oil feed unit comprises that control supplies with above-mentioned inclination with hydraulic cylinder and above-mentioned corner any the inclination, the corner directional control valve that flow of pressure oil with hydraulic cylinder, and be located at this inclination, corner with directional control valve and above-mentioned inclination with hydraulic cylinder, corner with between the hydraulic cylinder, and will optionally supply with above-mentioned inclination with hydraulic cylinder and above-mentioned corner any selector valve from the pressure oil that above-mentioned inclination, corner flow out with directional control valve with hydraulic cylinder; This fluid pressure drive device is characterised in that, possess with above-mentioned inclination, corner pressure oil feed unit independent to above-mentioned append driver supply pressure oil append driver pressure oil feed unit, this append driver pressure oil feed unit have control supply with the above-mentioned pressure oil that appends driver flow append the driver directional control valve.
The present invention of Gou Chenging is driving the occasion of using hydraulic cylinder with hydraulic cylinder or corner like this, by with append inclination that driver pressure oil feed unit independently is provided with, inclination that corner pressure oil feed unit is comprised, corner with directional control valve, selector valve, pressure oil that can flow-rate ratio is less is supplied with hydraulic cylinder or corner hydraulic cylinder, thus, more slowly speed drive these tilt with hydraulic cylinder and corner hydraulic cylinder.And, append the occasion of driver in driving, by the driver that appends that driver pressure oil feed unit comprised that appends that independently is provided with inclination, corner pressure oil feed unit is carried out conversion operations with directional control valve, append the driver directional control valve by this, can be to appending the bigger pressure oil of driver supply flow rate, thus can fast driving this append driver.
In addition, the present invention is in foregoing invention, it is characterized in that, the above-mentioned driver pressure oil feed unit that appends has first hydraulic pump that appends driver with directional control valve supply pressure oil to above-mentioned, above-mentioned inclination, corner pressure oil feed unit has to above-mentioned inclination, corner second hydraulic pump with directional control valve supply pressure oil, and above-mentioned first hydraulic pump to compare with above-mentioned second hydraulic pump be to discharge hydraulic pump capacious.
The present invention of Gou Chenging appends the occasion of driver in driving like this, by appending the conversion operations of driver with directional control valve, can supply with the pressure oil of big flow to appending driver from discharging first hydraulic pump capacious, can fast driving this append driver.And, driving the occasion of using hydraulic cylinder with hydraulic cylinder or corner, by the conversion operations that tilts, corner is used directional control valve, can discharge second hydraulic pump capacious and supply with the pressure oil of low discharge with hydraulic cylinder or corner with hydraulic cylinder from comparing with first hydraulic pump to tilting, slowly speed drive these tilt with hydraulic cylinder, corner hydraulic cylinder.
In addition, the present invention is in foregoing invention, it is characterized in that, the above-mentioned driver pressure oil feed unit that appends has the hydraulic pump that appends driver with directional control valve supply pressure oil to above-mentioned, above-mentioned inclination, corner pressure oil feed unit has to above-mentioned inclination, the corner hydraulic pump of directional control valve supply pressure oil, and above-mentioned above-mentioned hydraulic pump and above-mentioned inclination of appending driver pressure oil feed unit, the above-mentioned hydraulic pump of corner pressure oil feed unit is identical hydraulic pump, and the above-mentioned driver that appends is set at than above-mentioned inclination with the ratio of the relative slide valve stroke of aperture area of directional control valve, corner is also big with the ratio of the relative slide valve stroke of aperture area of directional control valve.
The present invention of Gou Chenging follows and appends the conversion operations of driver with directional control valve like this, can append driver from this and supply with the pressure oil of big flow to appending driver according to the ratio of the bigger relative slide valve stroke of aperture area with directional control valve, thus can fast driving this append driver.And, follow inclination, the corner conversion operations of directional control valve, can be according to the ratio of the smaller relative slide valve stroke of aperture area from this tilt, corner supplies with the pressure oil of low discharge with directional control valve to hydraulic tilt cylinder or corner hydraulic cylinder, thereby more slowly speed drive these tilt with hydraulic cylinder, corner hydraulic cylinder.
In addition, the present invention is in foregoing invention, it is characterized in that, the above-mentioned driver pressure oil feed unit that appends comprises reversal valve, this reversal valve is configured in above-mentioned append driver and above-mentioned appending between the driver usefulness directional control valve, and can disconnect, be communicated with connecting and above-mentionedly append driver and the above-mentioned pipeline that appends driver with directional control valve, and when disconnecting, the above-mentioned driver that appends is connected on the fuel tank.
The present invention of Gou Chenging converts reversal valve to be communicated with to and appends driver and to append the occasion of driver with directional control valve like this, can by append driver with directional control valve to appending driver supply pressure oil.And, append driver and to append the occasion of driver reversal valve being converted to disconnect with directional control valve, append driver and fuel tank and be communicated with, can realize by falling due to for example deadweight of appending annex of appending driver drives etc.
The present invention has following effect.
The present invention since with optionally to tilting with the inclination of hydraulic cylinder and corner with a supply pressure oil in the hydraulic cylinder, corner pressure oil feed unit is independent, have to what append driver supply pressure oil and append driver pressure oil feed unit, therefore can utilize inclination, corner pressure oil feed unit is supplied with the pressure oil of low discharge with hydraulic cylinder with hydraulic cylinder and corner to tilting, these tilt with hydraulic cylinder and corner hydraulic cylinder with speed drive more slowly, and, can utilize and append driver pressure oil feed unit and supply with the pressure oil of big flow to appending driver, this appends driver with fast driving, thus, can realize being difficult to the inclination carried out in the past, the raising of the operability of corner operation and utilization are by the both sides of the raising of the operability of the operation of appending annex of appending driver drives.
The specific embodiment
Below, be used to implement the best mode of fluid pressure drive device of the present invention based on description of drawings.
Fig. 1 is the lateral view of an example of the hydraulic crawler excavator of first embodiment of expression with fluid pressure drive device of the present invention, and Fig. 2 is the vertical view of the below part of expression hydraulic crawler excavator shown in Figure 1.
Shown in these Fig. 1,2, the hydraulic crawler excavator with first embodiment of the present invention has running body 1 and the rotary body 2 that is configured on this running body 1, disposes seat 3 on rotary body 2.On rotary body 2, connect the boom 4 that direction is up and down rotated, on this boom 4, connect the cantilever 5 that direction is up and down rotated, on this cantilever 5, connect the scraper bowl 6 that direction is up and down rotated.Constitute the preceding working rig that can carry out digging operation etc. by these booms 4, cantilever 5 and scraper bowl 6.In addition, by dismounting scraper bowl 6, hydraulic breaker etc. can be installed append annex.In the following description, suppose to replace scraper bowl 6 that hydraulic breakers etc. are installed and append annex.
In addition, dispose scraper plate 7 in the place ahead of running body 1, and have: make this scraper plate 7 scraper plate hydraulic cylinder 8 of direction rotation up and down; Make the inclination hydraulic cylinder 9 of scraper plate 7 direction rotation to the left and right; And the corner hydraulic cylinder 10 that makes scraper plate 7 direction rotation forwards, backwards.
Fig. 3 is the hydraulic circuit diagram of first embodiment of expression fluid pressure drive device of the present invention, Fig. 4 is the scraper plate that had of expression first embodiment of the present invention with the output characteristics of the pilot valve of the operation usefulness of directional control valve and inclination, the corner figure with the output characteristics of the pilot valve of the operation usefulness of directional control valve, Fig. 5 be expression first embodiment of the present invention had append the figure of driver with the output characteristics of the pilot valve of the operation usefulness of directional control valve.
That is, in this first embodiment, also have first hydraulic pump 12, second hydraulic pump 13 and the auxiliary hydraulic pump 14 that drive by motor 11.In addition, in this first embodiment, first hydraulic pump 12 constitutes by compare discharge hydraulic pump capacious with first hydraulic pump 13.The discharge pressure of these pumps 12,13,14 is stipulated by the corresponding easing valve in the easing valve 15,16,17.
In addition, in this first embodiment, also have: control is to the scraper plate that the flows directional control valve 18 of the pressure oil of scraper plate hydraulic cylinder 8 supplies; The inclination of flowing, the corner directional control valve 19 of the pressure oil of hydraulic cylinder 10 supplies used in control with hydraulic cylinder 9 and corner to inclination; And drive above-mentioned append annex append driver 27.Especially, this first embodiment have control to append pressure oil that driver 27 supplies with flow append driver with directional control valve 29.And, connect first hydraulic pump 12 and appended driver usefulness directional control valve 29, and connected scraper plate directional control valve 18 and inclination, corner usefulness directional control valve 19 and second hydraulic pump 13.
Connect, corner is with directional control valve 19 and tilt with hydraulic cylinder 9 and corner with on pipeline 28a, the 28b of hydraulic cylinder 10, has any selector valve 20 of using hydraulic cylinder 10 with hydraulic cylinder 19 and corner with optionally supplying with from the pressure oil that tilts, corner flows out with directional control valve 19.And, at the above-mentioned driver that appends with directional control valve 29 with append and have reversal valve 31 between the driver 27, this reversal valve 31 can disconnect, be communicated with connecting and appends driver with directional control valve 29 with append the pipeline of driver 27, and makes when disconnection and append driver 27 and be connected on the fuel tank 32.
In addition, have: the conversion operations scraper plate pilot valve 25 of directional control valve 18; The pilot valve 26 that conversion operations tilts, corner is used directional control valve 19; And conversion operations appends the pilot valve 30a of driver with directional control valve 29.
The output characteristics of pilot valve 25 is set at shown in the A of Fig. 4, and the output characteristics of pilot valve 26 is set at shown in the B of Fig. 4.Slope ratio is milder among these characteristics A, the B.In addition, the output characteristics of pilot valve 30a is compared slope with the output characteristics B of Fig. 4 and is set greatlyyer shown in the C of Fig. 5.
Tilt, corner is connected by trochanter with directional control valve 18 and corresponding scraper plate hydraulic cylinder 8, selector valve 20 with directional control valve 19 and scraper plate.
Have, have electrical system, this electrical system is connected on the power supply 23, comprises switch 23a, relay 22 and electromagnetic valve 22, is used to change selector valve 20.
Constitute to tilting with directional control valve 19 and selector valve 20 by above-mentioned second hydraulic pump 13, inclination, corner with hydraulic cylinder 9 and corner any optionally inclination, corner pressure oil feed unit of supply pressure oil with hydraulic cylinder 10.In addition, by first hydraulic pump 12, append driver and constitute to what append driver 27 supply pressure oil with directional control valve 29 and reversal valve 31 and append driver pressure oil feed unit.That is, first embodiment is made the separate structure that inclination, corner pressure oil feed unit is set and appends driver pressure oil feed unit.
First embodiment of Gou Chenging is by operated pilot valve 25 like this, and the pressure oil of supplying with from auxiliary hydraulic pump 14 is that controlled pressure offers the control room of scraper plate with directional control valve 18 as secondary pressure, changes this scraper plate directional control valve 18.Thus, supply with scraper plate hydraulic cylinder 8 by scraper plate with directional control valve 18,8 work of scraper plate hydraulic cylinder from the pressure oil that second hydraulic pump 13 is discharged.Thus, can make the direction rotation up and down of the scraper plate 7 shown in Fig. 1,2.
In addition, as shown in Figure 3 switch 23a is being remained under the state of disconnection, electromagnetic valve 21 is positioned at right position shown in Figure 3, and the pressure oil of auxiliary hydraulic pump 14 is not supplied with the control room of selector valve 20, and selector valve 20 remains on on the right position shown in Figure 3.Under this state, if operated pilot valve 26, then secondary pressure offers the control room of inclination, corner usefulness directional control valve 19, changes this inclination, corner directional control valve 19.Thus, supply with hydraulic cylinder 9 with directional control valve 19, selector valve 20 by inclination, corner, make this inclination hydraulic cylinder 9 work from the pressure oil that second hydraulic pump 13 is discharged.Thus, can make the direction rotation to the left and right of the scraper plate 7 shown in Fig. 1,2 and implement tilt operation.
In addition, if connect switch 23a, then electromagnetic valve 21 utilizes the signal that gives by relay 22 to be transformed into left position with Fig. 3.Thus, the pressure oil of discharging from auxiliary hydraulic pump 14 offers the control room of selector valve 20 by electromagnetic valve 21, and selector valve 20 is transformed into the left position with Fig. 3.Under this state, if operated pilot valve 26, then secondary pressure offers inclination, corner directional control valve 19, thereby changes this inclination, corner directional control valve 19.Thus, supply with corners with hydraulic cylinder 10 by inclination, corner with directional control valve 19, selector valve 20, make this corner hydraulic cylinder 10 work from the pressure oil that second hydraulic pump 13 is discharged.Thus, can make direction rotation forwards, backwards of the scraper plate 7 shown in Fig. 1,2 and the operation of enforcement corner.
In addition, when carrying out the operation of above-mentioned tilt operation and corner, with the control room that the secondary pressure that the mild characteristic B of slope represents is supplied with, corner is used directional control valve 19, and the pressure oil from the second little hydraulic pump 13 of discharge capacity is supplied with, corner directional control valve 19, so to tilting to use hydraulic pump 9 or corner to supply with the pressure oil of smaller flow with hydraulic cylinder 10.
In addition, if operated pilot valve 30a, then secondary pressure offers and appends the control room of driver with directional control valve 29, thereby driver directional control valve 29 is appended in conversion.Thus, append driver 27, make driver 27 work of appending from the pressure oil supply that first hydraulic pump 12 is discharged.Thus, can drive and append annex.
In addition, when carrying out this operation, append the control room of driver with the secondary pressure supply that the big characteristic C of slope represents with directional control valve 29, and append driver with directional control valve 29, so supply with the pressure oil of bigger flow to appending driver 24 from the pressure oil supply of discharging first hydraulic pump 12 capacious.
First embodiment according to such formation, driving the occasion of using hydraulic cylinder 10 with hydraulic cylinder 9 or corner, by supplying with the pressure oil of the second little hydraulic pump 13 of discharge capacity with appending inclination that driver pressure oil feed unit independently is provided with, inclination that corner pressure oil feed unit is comprised, corner with directional control valve 19, selector valve 20, pressure oil that thus can flow-rate ratio is less is supplied with hydraulic cylinder 9 or corner hydraulic cylinder 10.Thereby, these inclinations of speed drive more slowly hydraulic cylinder 9 and corner hydraulic cylinder 10.In addition, append the occasion of driver 27 in driving, by the driver that appends that driver pressure oil feed unit comprised that appends that independently is provided with inclination, corner pressure oil feed unit is carried out conversion operations with directional control valve 29, append driver by this and supply with the pressure oil of discharging first hydraulic cylinder capacious, big flow can be supplied with thus and append driver 27 with directional control valve 29.Thereby, can fast driving this append driver 27.The raising of the operability of thus, can realize, corner being operated and utilization are by the both sides of the raising of the operability of the not shown operation of appending annex of appending driver 27 drivings.
In addition, do not comprise electrical system appending driver pressure oil feed unit, so it is also passable that the electric component and the miscellaneous Wiring construction of the setting of following this electrical system needn't be set.
Fig. 6 is the hydraulic circuit diagram of expression second embodiment of the present invention.The road sensing control that this second embodiment enforcement is controlled according to the differential pressure of the maximum load pressure in pump discharge head and loop.
That is, in this second embodiment, on the hydraulic pump 35 of capacity variable type, be connected with scraper plate with directional control valve 18, inclination, corner with directional control valve 19 and append driver with directional control valve 29.Thereby hydraulic pump 35 double as tilt, the structural element of corner pressure oil feed unit and append the structural element of driver pressure oil feed unit.The discharge pressure of this hydraulic pump 35 utilizes easing valve 36 to stipulate.
At scraper plate with directional control valve 18, inclination, corner with directional control valve 19 and append for example upstream side of driver with directional control valve 29, be provided with according to the differential pressure of the pressure in the pressure of the upstream side of all directions control valve 18,19,29 and downstream and come pressure-compensated valve 18a, 19a, the 29a of work.And, have output loop maximum additonal pressure shuttle valve 38a, 38b and come the unloader 37 of work according to the differential pressure of the maximum load pressure in the discharge pressure of hydraulic pump 35 and loop.Have again, also have the adjuster 35a that adjusts the discharge capacity of pump 35 according to the differential pressure of the discharge pressure of hydraulic pump 35 and maximum load pressure.
In addition, this second embodiment especially will append driver with the ratio of the relative slide valve stroke of aperture area of directional control valve 29 be set at than tilt, corner is also big with the ratio of the relative slide valve stroke of aperture area of directional control valve 19.Other structures are identical with above-mentioned first embodiment.
In second embodiment that constitutes like this, when operated pilot valve 30a comes conversion operations to append driver with directional control valve 29, ratio according to its bigger relative slide valve stroke of aperture area, the pressure oil of big flow can be supplied with and append driver 27, can fast driving this append driver 27.And, when operated pilot valve 26 comes conversion operations inclination, corner with directional control valve 19, ratio according to its smaller relative slide valve stroke of aperture area, the pressure oil of low discharge can be supplied with hydraulic cylinder 9 or corner with hydraulic cylinder 10, can be with these hydraulic cylinders 9,10 of speed drive more slowly.Thereby same with above-mentioned first embodiment, the raising of the operability of can realize, corner being operated and utilization are by the both sides of the raising of the operability of the not shown operation of appending annex of appending driver 27 drivings.
Description of drawings
Fig. 1 is the lateral view of an example of the hydraulic crawler excavator of first embodiment of expression with fluid pressure drive device of the present invention.
Fig. 2 is the vertical view of the below part of expression hydraulic crawler excavator shown in Figure 1.
Fig. 3 is the hydraulic circuit diagram of first embodiment of expression fluid pressure drive device of the present invention.
Fig. 4 is the scraper plate that had of expression first embodiment of the present invention with the output characteristics of the pilot valve of the operation usefulness of directional control valve and inclination, the corner figure with the output characteristics of the pilot valve of the operation usefulness of directional control valve.
Fig. 5 be expression first embodiment of the present invention had append the figure of driver with the output characteristics of the pilot valve of the operation usefulness of directional control valve.
Fig. 6 is the hydraulic circuit diagram of expression second embodiment of the present invention.
Fig. 7 is the hydraulic circuit diagram of the existing fluid pressure drive device of expression.
Among the figure:
The 7-scraper plate, 8-scraper plate hydraulic cylinder, 9-tilts to use hydraulic cylinder, 10-corner hydraulic cylinder, the 12-first hydraulic fluid press pump (appending driver pressure oil feed unit), 13-second hydraulic pump (tilts, corner pressure oil feed unit), 14-auxiliary hydraulic pump, 18-scraper plate directional control valve, 19-tilts, corner (tilts with directional control valve, corner pressure oil feed unit), the 20-selector valve (tilts, corner pressure oil feed unit), 21-electromagnetic valve, the 22-relay, the 23-power supply, 23a-switch, 25-pilot valve, the 26-pilot valve, 27-appends driver, 28a-pipeline, 28b-pipeline, 29-appends driver with directional control valve (appending driver pressure oil feed unit), the 30a-pilot valve, 31-reversal valve (appending driver pressure oil feed unit), 32-fuel tank, the 35-hydraulic pump (tilts, corner pressure oil feed unit, append driver pressure oil feed unit), the 35a-adjuster.

Claims (4)

1. fluid pressure drive device, have and make the scraper plate scraper plate hydraulic cylinder of direction rotation up and down, make the inclination hydraulic cylinder of above-mentioned scraper plate direction rotation to the left and right, make the corner hydraulic cylinder of above-mentioned scraper plate direction rotation forwards, backwards, and make the driver that appends that appends annex work;
And have inclination, corner pressure oil feed unit, this inclination, corner pressure oil feed unit comprise: control is supplied with above-mentioned inclination with hydraulic cylinder and above-mentioned corner any the inclination, the corner directional control valve that flow of pressure oil with hydraulic cylinder; And be located at this inclination, corner with directional control valve and above-mentioned inclination with hydraulic cylinder, corner with between the hydraulic cylinder, and will optionally supply with above-mentioned inclination with hydraulic cylinder and above-mentioned corner any selector valve from the pressure oil that above-mentioned inclination, corner flow out with directional control valve with hydraulic cylinder; This fluid pressure drive device is characterised in that,
Possess with above-mentioned inclination, corner pressure oil feed unit independently to above-mentioned append driver supply pressure oil append driver pressure oil feed unit, this append driver pressure oil feed unit have control supply with the above-mentioned pressure oil that appends driver flow append the driver directional control valve.
2. fluid pressure drive device according to claim 1 is characterized in that,
The above-mentioned driver pressure oil feed unit that appends has first hydraulic pump that appends driver with directional control valve supply pressure oil to above-mentioned, above-mentioned inclination, corner pressure oil feed unit have second hydraulic pump of using directional control valve supply pressure oil to above-mentioned inclination, corner, and above-mentioned first hydraulic pump is to discharge hydraulic pump capacious than above-mentioned second hydraulic pump.
3. fluid pressure drive device according to claim 1 is characterized in that,
The above-mentioned driver pressure oil feed unit that appends has the hydraulic pump that appends driver with directional control valve supply pressure oil to above-mentioned, and above-mentioned inclination, corner pressure oil feed unit have the hydraulic pump of using directional control valve supply pressure oil to above-mentioned inclination, corner,
And the above-mentioned hydraulic pump of above-mentioned above-mentioned hydraulic pump that appends driver pressure oil feed unit and above-mentioned inclination, corner pressure oil feed unit is identical hydraulic pump,
Be set at the above-mentioned driver that appends also bigger with the ratio of the relative slide valve stroke of aperture area of directional control valve with the ratio of the relative slide valve stroke of aperture area of directional control valve than above-mentioned inclination, corner.
4. according to each described fluid pressure drive device in the claim 1～3, it is characterized in that,
The above-mentioned driver pressure oil feed unit that appends comprises reversal valve, this reversal valve is configured in above-mentioned append driver and above-mentioned appending between the driver usefulness directional control valve, and can disconnect, be communicated with connecting and above-mentionedly append driver and the above-mentioned pipeline that appends driver with directional control valve, and when disconnecting, the above-mentioned driver that appends is connected on the fuel tank.
CNA2006800030636A 2005-01-26 2006-01-24 Hydraulic drive device Pending CN101107401A (en)

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Publication number Priority date Publication date Assignee Title
CN102933857A (en) * 2010-05-24 2013-02-13 日立建机株式会社 Hydraulically driven system for construction machine
CN105556131A (en) * 2014-02-04 2016-05-04 日立建机株式会社 Hydraulic drive device for construction machinery
CN108999819A (en) * 2018-10-09 2018-12-14 广西玉柴重工有限公司 A kind of hydraulic auxiliary function expanding device
CN110566532A (en) * 2019-09-20 2019-12-13 广西玉柴重工有限公司 Multi-way valve is suitable for and widens device

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US7942208B2 (en) 2008-11-06 2011-05-17 Purdue Research Foundation System and method for blade level control of earthmoving machines
JP5996778B2 (en) * 2013-03-22 2016-09-21 日立建機株式会社 Hydraulic drive unit for construction machinery

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JPH10331211A (en) * 1997-06-02 1998-12-15 Hitachi Constr Mach Co Ltd Hydraulic circuit device of construction machinery
JP2002038534A (en) * 2000-07-21 2002-02-06 Hitachi Constr Mach Co Ltd Operation change-over control circuit for a plurality of actuators retrofitted in multi-functional excavator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102933857A (en) * 2010-05-24 2013-02-13 日立建机株式会社 Hydraulically driven system for construction machine
CN102933857B (en) * 2010-05-24 2015-07-08 日立建机株式会社 Hydraulically driven system for construction machine
CN105556131A (en) * 2014-02-04 2016-05-04 日立建机株式会社 Hydraulic drive device for construction machinery
CN108999819A (en) * 2018-10-09 2018-12-14 广西玉柴重工有限公司 A kind of hydraulic auxiliary function expanding device
CN110566532A (en) * 2019-09-20 2019-12-13 广西玉柴重工有限公司 Multi-way valve is suitable for and widens device

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