WO2005031172A1 - 産業機械の油圧制御装置 - Google Patents
産業機械の油圧制御装置 Download PDFInfo
- Publication number
- WO2005031172A1 WO2005031172A1 PCT/JP2004/013611 JP2004013611W WO2005031172A1 WO 2005031172 A1 WO2005031172 A1 WO 2005031172A1 JP 2004013611 W JP2004013611 W JP 2004013611W WO 2005031172 A1 WO2005031172 A1 WO 2005031172A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hydraulic
- pressure
- circuit
- load
- control device
- Prior art date
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 36
- 239000010720 hydraulic oil Substances 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 5
- 230000008602 contraction Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or 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
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
-
- 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
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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
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
-
- 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
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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
- 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
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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
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
- F15B2211/30—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
- F15B2211/31576—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 a single 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- 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
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40546—Flow control characterised by the type of flow control means or valve with flow combiners
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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
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
-
- 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
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
-
- 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
- F15B2211/50—Pressure control
- F15B2211/51—Pressure control characterised by the positions of the valve element
- F15B2211/513—Pressure control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
-
- 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
- F15B2211/50—Pressure control
- F15B2211/52—Pressure control characterised by the type of actuation
- F15B2211/528—Pressure 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
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
Definitions
- the present invention relates to a hydraulic control device for an industrial machine, and more particularly to a hydraulic control device suitable for use in a large cargo handling vehicle such as a reach stat force having a plurality of main hydraulically driven working machines.
- Patent Document 1 discloses a technique in a hydraulic drive device of a working machine such as a hydraulic shovel, particularly provided with a joining valve for joining hydraulic oils of two hydraulic pumps.
- the engine 100 is connected to the first and second hydraulic pumps 101, 102 of the variable displacement type driven by the engine 100, and the first hydraulic pump 101.
- the second directional control valve is connected to the most downstream directional control valve of the group via a center bypass passage 105, and joins the pressure oil of the first hydraulic pump 101 with the pressure oil of the second hydraulic pump 102.
- a convergence valve 106 for allowing supply to the convergence control valve 104 of the group, a convergence circuit 107 connecting the convergence valve 106 and a supply port of the convergence control valve 104, And a merging factor controller 108 controlled by 104.
- the merging directional control valve 104 when driving the merging actuator 108, the merging directional control valve 104 is switched to the right position in FIG. 4 by the pilot pressure, and the merging valve 106 is switched to the closed position against the spring force.
- the hydraulic circuit between the center bypass passage 105 and the tank is blocked. Refused.
- the hydraulic oil of the second hydraulic pump 102 is supplied to the supply port of the directional control valve 104 for confluence via the hydraulic pressure center bypass passage 105 and the confluence circuit 107 of the first hydraulic pump 101.
- the combined hydraulic oil of the first hydraulic pump 101 and the second hydraulic pump 102 is supplied from the directional control valve 104 to a merging actuator 108, which operates to break a hydraulic shovel (not shown). Tools (as attachments) are driven to perform rock crushing work.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-295803 (FIG. 5)
- Patent Document 1 states that in the case of the above-described combined operation, the number of cases in which the corresponding directional control valve 103 completely closes the center binos passage 105 in actual work is small. There is a tendency for a part of the pressure oil of the pump 101 to be supplied, and the merging factor 108 is likely to be driven by a part of the pressure oil of the first hydraulic pump 101 and the pressure oil of the second hydraulic pump 102. ,, Are described.
- an object of the present invention is to efficiently control a large amount of pressurized oil with a simple hydraulic device configuration.
- An object of the present invention is to provide a hydraulic control device for an industrial machine that can be controlled.
- a hydraulic control device for an industrial machine includes a plurality of variable displacement hydraulic pumps driven by a prime mover, and a plurality of these hydraulic pumps and a plurality of hydraulic drive operating machines. And a control valve for controlling the flow rate and the direction of the pressure oil supplied to the hydraulically driven working machine, each of which is interposed in the middle of the plurality of main hydraulic circuits.
- a merging circuit for merging pressure oil of the plurality of main hydraulic circuits with a main hydraulic circuit located upstream of each control valve in accordance with operating conditions of the hydraulically driven working machine. It is characterized by the provision of a merging block that constitutes
- hydraulic oil from a discharge (rod side) port of the hydraulically driven working machine is supplied to a main hydraulic (cylinder drive) circuit between each of the control valves and the hydraulically driven working machine corresponding to the control valve. It is preferable to provide a differential circuit block for returning to the supply (head side) port of the hydraulic drive working machine, and to return the pressure oil when the pressure oil joins.
- each of the hydraulic pumps is configured to be load-sensitive, and when these hydraulic pumps and the control valve corresponding to the hydraulic pumps are connected by load pressure (load sensing pressure) circuits, respectively. It is suitable.
- the hydraulic drive working machine is a tilt cylinder and a telescopic cylinder in a telescopic boom of reach stat force, and when the two cylinders are operated in a combined manner, the confluence block causes the hydraulic oil and load of the main hydraulic circuits of the plurality of systems to be combined. It is preferable from the viewpoint of system efficiency to combine the load pressure of the pressure circuit and the load pressure simultaneously.
- the pressure oil of the plurality of main hydraulic circuits is reduced when the load pressure is smaller than when the machine is loaded, and when the hydraulically-driven working machine is combinedly operated when there is no load.
- the high-pressure operation with no load can be realized by efficiently controlling a large amount of hydraulic oil.
- the present invention since the present invention has a configuration in which only the merging block is provided in the main hydraulic circuit positioned upstream of each control valve, the desired function can be achieved with a simple hydraulic device configuration.
- FIG. 1 is a hydraulic circuit diagram of reach statistic force showing an embodiment of a hydraulic control device for an industrial machine.
- FIG. 2 is a hydraulic circuit diagram showing different states of operation.
- FIG. 3 is a side view of the reach stat force.
- FIG. 4 is a hydraulic circuit diagram showing a conventional example.
- FIG. 1 is a hydraulic circuit diagram of a reach stat force showing an embodiment of a hydraulic control device of an industrial machine
- FIG. 2 is a hydraulic circuit diagram showing different operation states
- FIG. 3 is a side view of a reach stat force. .
- the reach boom 6 is raised and lowered via a tower 5 on a chassis 4 having a pair of front wheels 1 and rear wheels 2 and capable of traveling by an engine (motor) 3. It is supported as much as possible.
- a spreader 7 capable of holding a long container or the like is hung.
- the telescopic boom 6 is raised and lowered by two tilt cylinders (hydraulic drive working machines) 8 provided as a pair between the chassis 4 and the outer boom 6b, and the inner boom 6a and the upper boom 6b
- the telescopic cylinder (hydraulic drive working machine) 9 provided between them performs the stretching operation.
- a cabinet 11 is provided on the chassis 4 via a pair of left and right rails 10. It is slidably provided in the direction.
- the two tilt cylinders 8 are mainly connected to a first hydraulic pump 20 of a variable displacement type driven by the engine 3. It is connected via a hydraulic (cylinder drive) circuit 21, and pressurized oil from the first hydraulic pump 20 is supplied and discharged by an up / down control valve (device) 22 provided in the middle of the main hydraulic circuit 21. It expands and contracts by doing.
- the one telescopic cylinder 9 is connected via a main hydraulic (cylinder drive) circuit 24 to a variable displacement type second hydraulic pump 23 which is also driven by the engine 3.
- the pressure oil from the second hydraulic pump 23 is supplied and discharged by the expansion / contraction control valve (device) 25 interposed in the middle, so that the expansion / contraction operation is performed.
- the undulating control valve (device) 22 is an electromagnetic proportional valve 26a for controlling the flow rate and the direction of the pressure oil supplied to the tilt cylinder 8, and a pressure (a) provided in a passage before the electromagnetic proportional valve 26a. It has a pressure compensating valve 27a that keeps a constant flow rate even if the load changes, and a pressure control valve 28a provided in a passage leading to the tank 29.
- the expansion / contraction control valve (device) 25 includes an electromagnetic proportional valve 26b for controlling the flow rate and direction of the pressure oil supplied to the telescopic cylinder 9, and a pressure (load) provided in a passage before the electromagnetic proportional valve 26b. ) Is provided with a pressure compensating valve 27b that always maintains a constant flow rate even when the pressure changes, and a pressure control valve 28b provided in a passage leading to the tank 29.
- the tilt control of the first hydraulic pump 20 and the second hydraulic pump 23 is of a load-sensitive type, and the hydraulic pumps 20, 23 and the electromagnetic proportional valves 26 a, 26b are connected by load pressure circuits 30, 31.
- 32 and 33 are check valves.
- the main hydraulic circuits 21, 24 and the load pressure circuits 30, 31 located upstream of the control valves 22, 25 are provided in the main hydraulic circuits 21, 24 and the load pressure circuits 30, 31 in accordance with the operating conditions of the tilt cylinder 8 and the telescopic cylinder 9.
- a merging block which forms a merging circuit for merging the hydraulic oil of the main hydraulic circuits 21 and 24 with the load pressure of the load pressure circuits 30 and 31. That is, an independent electromagnetic switching valve 35 is provided in a passage connecting the two main hydraulic circuits 21, 24, and an independent electromagnetic switching valve 35 is provided in the passage connecting the two load pressure circuits 30, 31. Is provided.
- the main hydraulic circuits 21 and 24 between the control valves 22 and 25 and the tilt cylinder 8 and the telescopic cylinder 9 have discharges (ports) when the tilt cylinder 8 and the telescopic cylinder 9 extend.
- the differential circuit blocks 37 and 38 are provided to recirculate the pressure oil from the (head side) port to the supply (head side) port during extension. That is, electromagnetic switching valves 39a, 39b which can be opened at a predetermined extension are provided in a bypass passage connecting the head side passages 21a, 24a of the main hydraulic circuits 21, 24 and the mouth side passages 21b, 24b.
- Electromagnetic switching valves 40a, 40b that can be closed at a predetermined extension are provided in rod-side passages 21b, 24b on the control valves 22, 25 side from the branch point of the bypass passage.
- the electromagnetic proportional valves 26a, 26 merge with the independent electromagnetic switching valves 35, 36 and the electromagnetic switching valves 39a, 39b, 40a, 40b are driven and controlled by a work equipment controller (ECU) not shown.
- ECU work equipment controller
- the working machine controller includes a joystick (not shown) operated by an operator in the cabinet 11, a hydraulic sensor (not shown) built in the tilt cylinder 8 and the telescopic cylinder 9, and the like.
- a joystick not shown
- the two main hydraulic circuits 21 , 24 and the load pressure circuit 30, 31 are controlled simultaneously so that the tilt cylinder 8 or telescopic cylinder 9, which requires a large amount of pressure oil, is extended when the pressure oil is extended.
- the differential circuit block 37 or 38 is controlled so that the pressure oil on the pressure side is returned to the head side, so that high-speed operation at no-load of reach stat force can be realized. It is! /, Ru.
- the two main hydraulic circuits 21 and 24 The merging block 34 is controlled so that the pressure oil and the load pressure of the load pressure circuits 30 and 31 are not combined and the system becomes a single system, thereby achieving the load-sensitive operation of the reach stat force under load.
- the hydraulic oil of the first hydraulic pump 20 is supplied to the rod side of the tilt cylinder 8 by the main hydraulic circuit.
- the fluid is supplied to the specified flow rate by the electromagnetic proportional valve 26a without being merged with the pressure oil of the second hydraulic pump 23 through the passage 21.
- the discharge amount of the first hydraulic pump 20 is variable according to the load pressure of the load pressure circuit 30, and efficient control is performed.
- the differential circuit block 37 does not function.
- the electromagnetic proportional valve 26a of the up / down control valve 22 The position is switched to the position, and the merging 'independent electromagnetic switching valves 35 and 36 of the merging block 34 are both closed. Further, the electromagnetic switching valve 39a of the differential circuit block 37 is closed, while the electromagnetic switching valve 40a is opened.
- the hydraulic oil of the first hydraulic pump 20 passes through the main hydraulic circuit 21 and does not merge with the hydraulic oil of the second hydraulic pump 23 on the head side of the tilt cylinder 8, and the electromagnetic proportional valve 26 a It is supplied to the specified flow rate.
- the discharge amount of the first hydraulic pump 20 is variable according to the load pressure of the load pressure circuit 30, and efficient control is performed.
- the differential circuit block 37 does not function.
- the pressure oil of the second hydraulic pump 23 merges with the pressure oil of the first hydraulic pump 20 via the independent electromagnetic switching valve 35 on the head side of the tilt cylinder 8, and the electromagnetic proportional valve
- the large flow pressure oil required by 26a is supplied. That is, in the initial stage of the vertical rise of the telescopic boom 6, the tilt cylinder 8 has a larger load than the telescopic cylinder 9 and requires a large amount of hydraulic oil, but the flow rate corresponding to this is adjusted by the first hydraulic pump 20 and the second hydraulic pump. 23 can also be supplied by functioning as one pump.
- the differential circuit block 37 also functions, and the pressure oil on the rod side of the tilt cylinder 8 does not return to the tank 29 side but returns to the head side via the electromagnetic switching valve 39a. Supplied The flow rate of pressurized oil to be increased increases, and a higher speed operation is realized. Also, at this time, the same load pressure acts on the first hydraulic pump 20 and the second hydraulic pump 23 through the independent electromagnetic switching valve 36, and the discharge amount is variable according to this load pressure, so that the efficiency is improved. Good control is performed.
- the telescopic cylinder 9 has the same operation as the tilt cylinder 8, the description is omitted. Further, in the above embodiment, the differential circuit blocks 37 and 38 need not be particularly provided, and the first and second hydraulic pumps 20 and 23 do not need to directly respond to the load pressure in the load pressure circuits 30 and 31 in particular. Is also good.
- the hydraulic control device for an industrial machine can be applied not only to a large cargo handling vehicle such as a reach stat force but also to an industrial (transport) machine such as a crane.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Transportation (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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AU2004276616A AU2004276616A1 (en) | 2003-09-26 | 2004-09-17 | Hydraulic control device of industrial machinery |
EP04773255A EP1666735A1 (en) | 2003-09-26 | 2004-09-17 | Hydraulic control device of industrial machinery |
US10/570,490 US20060277905A1 (en) | 2003-09-26 | 2004-09-17 | Hydraulic control device of industrial machinery |
Applications Claiming Priority (2)
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JP2003335194A JP2005098455A (ja) | 2003-09-26 | 2003-09-26 | 産業機械の油圧制御装置 |
JP2003-335194 | 2003-09-26 |
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WO2005031172A1 true WO2005031172A1 (ja) | 2005-04-07 |
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PCT/JP2004/013611 WO2005031172A1 (ja) | 2003-09-26 | 2004-09-17 | 産業機械の油圧制御装置 |
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US (1) | US20060277905A1 (ja) |
EP (1) | EP1666735A1 (ja) |
JP (1) | JP2005098455A (ja) |
CN (1) | CN1846068A (ja) |
AU (1) | AU2004276616A1 (ja) |
WO (1) | WO2005031172A1 (ja) |
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EP2322557A2 (en) | 2005-10-14 | 2011-05-18 | Innate Pharma | Compositions and methods for treating proliferative disorders |
CN103738889A (zh) * | 2014-01-16 | 2014-04-23 | 合肥正威液压科技有限公司 | 新型集成电液比例控制*** |
CN103821451A (zh) * | 2014-02-28 | 2014-05-28 | 金川集团股份有限公司 | 凿岩机防卡钎液压控制*** |
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- 2004-09-17 EP EP04773255A patent/EP1666735A1/en not_active Withdrawn
- 2004-09-17 WO PCT/JP2004/013611 patent/WO2005031172A1/ja active Application Filing
- 2004-09-17 AU AU2004276616A patent/AU2004276616A1/en not_active Abandoned
- 2004-09-17 US US10/570,490 patent/US20060277905A1/en not_active Abandoned
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JPS57116965A (en) * | 1980-11-24 | 1982-07-21 | Linde Ag | Hydraulic pressure driving system with variable discharging pump |
JPH04296205A (ja) * | 1991-01-15 | 1992-10-20 | Linde Ag | 油圧駆動系 |
JPH06123302A (ja) * | 1992-10-08 | 1994-05-06 | Kayaba Ind Co Ltd | 建設機械の油圧制御装置 |
WO1994010455A1 (en) * | 1992-10-27 | 1994-05-11 | Kabushiki Kaisha Komatsu Seisakusho | Flow dividing and combining switching device for a plurality of pumps in a load sensing system |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1890044A1 (de) * | 2004-04-23 | 2008-02-20 | Botschafter-Knopff, Ilse | Hydraulische Steuereinrichtung |
EP2322557A2 (en) | 2005-10-14 | 2011-05-18 | Innate Pharma | Compositions and methods for treating proliferative disorders |
CN103738889A (zh) * | 2014-01-16 | 2014-04-23 | 合肥正威液压科技有限公司 | 新型集成电液比例控制*** |
CN103821451A (zh) * | 2014-02-28 | 2014-05-28 | 金川集团股份有限公司 | 凿岩机防卡钎液压控制*** |
Also Published As
Publication number | Publication date |
---|---|
CN1846068A (zh) | 2006-10-11 |
US20060277905A1 (en) | 2006-12-14 |
JP2005098455A (ja) | 2005-04-14 |
AU2004276616A1 (en) | 2005-04-07 |
EP1666735A1 (en) | 2006-06-07 |
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