EP1915538A1 - Circuit for controlling a double-action hydraulic drive cylinder - Google Patents
Circuit for controlling a double-action hydraulic drive cylinderInfo
- Publication number
- EP1915538A1 EP1915538A1 EP06701053A EP06701053A EP1915538A1 EP 1915538 A1 EP1915538 A1 EP 1915538A1 EP 06701053 A EP06701053 A EP 06701053A EP 06701053 A EP06701053 A EP 06701053A EP 1915538 A1 EP1915538 A1 EP 1915538A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- directional control
- drive cylinder
- control valve
- load
- 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.)
- Granted
Links
Classifications
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
-
- 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
- F15B11/003—Systems with load-holding valves
-
- 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
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
-
- 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
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- 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
- F15B2211/30505—Non-return valves, i.e. check 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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/3051—Cross-check 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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/30515—Load holding 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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-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
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
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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
- F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
- F15B2211/3127—Floating position connecting the working ports and 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
- F15B2211/30—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
- F15B2211/315—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
-
- 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
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in control
-
- 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
- F15B2211/35—Directional control combined with flow control
- F15B2211/353—Flow control by regulating means in return line, i.e. meter-out control
-
- 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
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
- F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Definitions
- the invention relates to a circuit for controlling a double-acting hydraulic drive cylinder according to the preamble of claim 1.
- the so-called regeneration is therefore effective when extending the rod from the drive cylinder, which may mean, for example, the lifting of a load.
- no regeneration takes place.
- the entire amount of hydraulic oil exiting from the piston space of the hydraulic drive cylinder must be discharged to the tank via the directional control valve, while the amount of hydraulic oil to be delivered into the rod space must flow from the pump via the directional control valve.
- the pump When lowering the load, the pump must therefore perform and the total amount of hydraulic oil must flow through the long lines.
- a controlled floating circuit for an actuator is known.
- additional control means namely a pilot-operated check valve, which is controlled by an electrically controlled valve.
- the electrically controlled valve in turn is driven by a contact of a switch assembly.
- a second pilot-operated check valve is also required, which is controlled by a proportional pressure control part.
- an additional outlet valve is required, which requires actuation by a second proportional pressure control part.
- a regeneration of the piston chamber to the rod space is therefore possible here in principle, but requires control interventions and is bound to the presence of pilot-operated check valves and their An horrorgane. Hydraulically controlled valves and their actuators, which also act hydraulically, lead to pressure losses and thus require a certain power requirement.
- the invention has for its object to simplify the hydraulic circuit and at the same time further reduce the power requirement by hydraulic flow resistance and thus the ⁇ lericarmung be minimized.
- the above object is achieved by the features of claim 1.
- 1 is a diagram of a circuit for controlling a double-acting hydraulic drive cylinder
- Fig. 5 shows a circuit variant
- Fig. 6 is a diagram for the operation of two parallel operating drive cylinder.
- a double-acting hydraulic drive cylinder 1 is shown, in which by a piston 2 and a piston rod 3 connected thereto, a load 4 is movable. Can be controlled, the drive cylinder 1 by a directional control valve 5, which is controllable in a known manner by 6 drives.
- the directional control valve 5 has a pump connection P, a tank connection T, a first working connection A and a second working connection B in a known manner.
- a first drive 6.1 brings in a known manner the directional control valve 5 in that position in which the pump port P to the working port B and the tank port T are connected to the working port A.
- a second drive 6.2 brings the directional control valve 5 in the position in which the pump port P to the working port A and the tank port T to the working port B are connected. If none of the drives 6 is activated, the directional control valve 5 assumes the drawn position, which represents the neutral position of the directional control valve 5.
- the drive cylinder 1 has a piston chamber 11 and a rod space 12.
- the function "lifting” can be achieved for the load 4 by feeding - A - of hydraulic oil in the rod chamber 12 with simultaneous removal of hydraulic oil from the piston chamber 11, the function "lowering".
- the inflowing and outflowing quantities of hydraulic oil are not the same because of the different cross sections of piston chamber 11 and rod space 12.
- Erf ⁇ ndungsmul is a piston chamber A 11 on the piston chamber 11 via a pressure relief valve 21 and an automatic regeneration check valve 22, which requires no control, connected to a rod space connection A 12 on the rod space 12.
- a flow of the hydraulic oil from the piston chamber port A 11 to the rod space connection A 12 is possible, which will be described later.
- the pressure limiting valve 21 causes the limitation of the pressure in the piston chamber 11.
- this pressure relief valve 21 opens when the pressure in the piston chamber 11 is higher than the pressure set at the pressure relief valve 21, so that hydraulic oil the piston chamber 11 can flow to reduce the pressure, so limit.
- the hydraulic oil flows in different ways depending on the operating conditions. With the pressure limiting valve 21, the drive cylinder 1 is secured against external loads.
- the regeneration check valve 22 opens automatically when there is a higher pressure at its side facing the piston chamber connection A 11 than at its side facing the rod chamber connection A 12 . For a regeneration of the piston chamber 11 to the rod space 12 is possible without additional control means must be operated.
- the Load-holding valve 26 can be controlled by a control pressure px, which is present at a control pressure connection X.
- a first automatic bypass check valve 28 is arranged. Thereby, the blocking effect of the first biasing valve 24 and load-holding valve 26 can be bypassed in one direction, so that hydraulic oil from the working port A of the directional control valve 5 to the piston chamber port Aj i can flow when the directional control valve 5 is driven accordingly. A control intervention is not required.
- Fig. 2 the same scheme as shown in Fig. 1, but now is the directional control valve 5 in another position, in which the pump port P to the working port B and the tank port T are connected to the working port A.
- This other position is achieved in that the first drive 6.1 is acted upon by the already mentioned control pressure px.
- hydraulic oil flows from the piston chamber 11 because of the here also controlled load-holding valve 26 through this and the regeneration check valve 22 in the rod space 12. Because of Different cross sections of the piston chamber 11 and rod space 12, the difference in quantity over the first biasing valve 24 and thus via the working port A of the directional control valve 5 to the tank port T and thus flow into the tank here.
- the operating mode shown in FIG. 2 results in a faster movement compared with the operating mode of FIG. 1.
- this rapid traverse requires little energy for the pump, because here, too, that part of the hydraulic oil flowing from the piston chamber 11 directly via the load-holding valve 26 and the regeneration check valve 22 into the rod chamber 12, does not have to be funded by the pump.
- Figs. 1 and 2 states are shown, in which the load 4 acts above the drive cylinder 1, because the drive cylinder 1 is inclined so that the load-side end of the piston rod 3 is higher than the piston-side end of the piston rod 3.
- Arrangement means extending the lifting of the load 4 while retracting means lowering the load.
- the hydraulic drive cylinder 1 always has this position.
- the control of load-holding valve 26 and the directional control valve 5 is the same as in FIG. 2.
- the control pressure px is applied both to the load-holding valve 26 and to the first drive 6.1 of the directional control valve 5. Therefore, the directional control valve 5 is in the position shown, in which the pump port P to the working port B and the tank port T are connected to the working port A.
- the pump delivers hydraulic oil from the pump port P via the working port B through the opening second bypass check valve 32 through the rod space connection A 12 in the rod space 12.
- the operating mode is shown extending.
- the directional control valve 5 assumes the position shown in the directional valve 5, the pump port P is connected to the working port A and the working port B to the tank port T.
- the pumped by the pump hydraulic oil reads from the pump port P to the working port A and the automatically opening first bypass check valve 28 in the piston chamber 11 at the same time displaced from the rod chamber 12 hydraulic oil, which flows through the existing self-opening second biasing valve 30 and existing in the directional control valve 5 connection from the working port B to the tank port T in the tank.
- the load-holding valve 26 is not activated and the regeneration check valve 22 is closed.
- the extension is independent of the spatial position of the hydraulic drive cylinder 1. If the drive cylinder 1 in the position shown, the extension means lifting the load 4. If the drive cylinder 1 in the position shown in FIG. 3, that means Extending the lowering of the load. Of course, the power to be applied by the pump is different in both cases.
- associated pressure relief valve 21 has the purpose to protect the drive cylinder 1 during retraction from excessive load. If the pressure in the piston chamber 11 is greater than the pressure set on the pressure limiting valve 21, the pressure limiting valve 21 opens and hydraulic oil flows via the regeneration check valve 22 to the rod chamber 12 and / or via the biasing valve 24 and the directional control valve 5 to the tank. Which way it takes depends on the respective operating conditions.
- the pressure limiting valve 21, the regeneration check valve 22, the first biasing valve 24, the load holding valve 26, the first bypass check valve 28, the second biasing valve 30 and the second bypass check valve 32 in a single valve block 40 and assembled directly to the drive cylinder 1 ,
- the circuit is the same as that of FIG. 1, but here lacks the parallel connection of the second biasing valve 30 and the second bypass check valve 32.
- the required for the operation of the circuit according to the invention Rod space 12 is achieved by a in the tank line between the tank port T and the tank disposed further biasing valve 45. This thus assumes the function of the second biasing valve 30 of FIGS. 1 to 4. The described performance does not change.
- the biasing valve 45 is connected between the rod space 12 and the tank in series with the directional control valve 5.
- FIG. 6 two parallel operating drive cylinder 1 are shown. Both attack on the same load 4 '. This is applied when the load 4 'is very heavy.
- Each drive cylinder 1 is driven by a similar, that of FIG. 1 corresponding circuit.
- Like reference numerals also refer to the same parts as in Fig. 1. Die Both drive cylinders 1 are driven in parallel by a single directional valve 5, so that they are completely similar to the working ports A and B of the directional control valve 5 connected.
- the two load-holding valve 26 are also controlled in parallel by the control pressure px.
- a compensation line 49 is additionally required, with which the piston chambers 11 of both drive cylinders 1 are connected.
- Each of the drive cylinders 1 is assigned a compensation line nozzle 50 and a compensation power check valve 51, which are arranged parallel to one another in the compensation line 49. This ensures that the pressures in the two piston chambers 11 are equal. If the pressure in one of the piston chambers 11 is greater, then hydraulic oil can flow from this piston chamber 11 into the piston chamber 11 of the other drive cylinder 1, the hydraulic oil first passing through the closest compensation nozzle 50 and then the compensation power check valve 51 assigned to the other drive cylinder 1 ,
- valve block 40 may also include the directional control valve 5, as well as the possibly existing additional biasing valve 45th
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH13662005 | 2005-08-19 | ||
PCT/CH2006/000057 WO2007019712A1 (en) | 2005-08-19 | 2006-01-27 | Circuit for controlling a double-action hydraulic drive cylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1915538A1 true EP1915538A1 (en) | 2008-04-30 |
EP1915538B1 EP1915538B1 (en) | 2012-04-04 |
Family
ID=35198032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06701053A Not-in-force EP1915538B1 (en) | 2005-08-19 | 2006-01-27 | Circuit for controlling a double-action hydraulic drive cylinder |
Country Status (7)
Country | Link |
---|---|
US (1) | US7752842B2 (en) |
EP (1) | EP1915538B1 (en) |
JP (1) | JP2009505013A (en) |
KR (1) | KR20080021779A (en) |
CN (1) | CN101253335B (en) |
AT (1) | ATE552425T1 (en) |
WO (1) | WO2007019712A1 (en) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE531754C2 (en) * | 2007-05-11 | 2009-07-28 | Nordhydraulic Ab | Hydraulic load control valve device |
EP2189666B1 (en) * | 2008-11-20 | 2011-07-27 | Bosch Rexroth Oil Control S.p.A. | A hydraulic device for controlling an actuator. |
DE202009006299U1 (en) * | 2009-04-29 | 2010-09-09 | Liebherr-France Sas, Colmar | Hydraulic system as well as mobile construction machine |
JP2011214598A (en) * | 2010-03-31 | 2011-10-27 | Takara Belmont Co Ltd | Hydraulic control circuit for double-acting cylinder |
EP2466153B1 (en) * | 2010-12-17 | 2013-08-14 | HAWE Hydraulik SE | Electrohydraulic control device |
US9080310B2 (en) * | 2011-10-21 | 2015-07-14 | Caterpillar Inc. | Closed-loop hydraulic system having regeneration configuration |
CN102383905B (en) * | 2011-11-08 | 2012-12-26 | 上海三一重机有限公司 | Intelligent control method for after-treatment regeneration of engine for engineering machinery |
DE102012001562A1 (en) * | 2012-01-27 | 2013-08-01 | Robert Bosch Gmbh | Valve arrangement for a mobile work machine |
EP3064654A4 (en) * | 2013-10-31 | 2017-06-28 | Volvo Construction Equipment AB | Flow control valve for construction equipment, having floating function |
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DE10006908A1 (en) * | 2000-02-16 | 2001-08-23 | Caterpillar Sarl Genf Geneva | Hydraulic cylinder unit for raising and lowering front arm on root harvester has branch pipe leading back to oil tank which is fitted with shut-off valve and pressure-regulating valve |
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2006
- 2006-01-27 WO PCT/CH2006/000057 patent/WO2007019712A1/en active Application Filing
- 2006-01-27 CN CN200680030265XA patent/CN101253335B/en not_active Expired - Fee Related
- 2006-01-27 US US11/988,908 patent/US7752842B2/en not_active Expired - Fee Related
- 2006-01-27 KR KR1020087000872A patent/KR20080021779A/en not_active Application Discontinuation
- 2006-01-27 EP EP06701053A patent/EP1915538B1/en not_active Not-in-force
- 2006-01-27 AT AT06701053T patent/ATE552425T1/en active
- 2006-01-27 JP JP2008526346A patent/JP2009505013A/en active Pending
Non-Patent Citations (1)
Title |
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See references of WO2007019712A1 * |
Also Published As
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JP2009505013A (en) | 2009-02-05 |
CN101253335A (en) | 2008-08-27 |
WO2007019712A1 (en) | 2007-02-22 |
ATE552425T1 (en) | 2012-04-15 |
US7752842B2 (en) | 2010-07-13 |
CN101253335B (en) | 2010-06-16 |
US20100083651A1 (en) | 2010-04-08 |
EP1915538B1 (en) | 2012-04-04 |
KR20080021779A (en) | 2008-03-07 |
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