EP1375926B1 - Hydraulic control system for a working machine - Google Patents

Hydraulic control system for a working machine Download PDF

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Publication number
EP1375926B1
EP1375926B1 EP03013909A EP03013909A EP1375926B1 EP 1375926 B1 EP1375926 B1 EP 1375926B1 EP 03013909 A EP03013909 A EP 03013909A EP 03013909 A EP03013909 A EP 03013909A EP 1375926 B1 EP1375926 B1 EP 1375926B1
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EP
European Patent Office
Prior art keywords
cylinder
pressure
valve
safety valve
safety
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.)
Expired - Lifetime
Application number
EP03013909A
Other languages
German (de)
French (fr)
Other versions
EP1375926A1 (en
Inventor
Philippe Ostermann
Emmanuel Berthod
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.)
Deere and Co
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Deere and Co
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Filing date
Publication date
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Publication of EP1375926A1 publication Critical patent/EP1375926A1/en
Application granted granted Critical
Publication of EP1375926B1 publication Critical patent/EP1375926B1/en
Anticipated expiration legal-status Critical
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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
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
    • 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
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • 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
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/315—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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a 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
    • F15B2211/40—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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow 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
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the 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
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance 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
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8616—Control during or prevention of abnormal conditions the abnormal condition being noise or vibration
    • 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
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/8636—Circuit failure, e.g. valve or hose failure

Definitions

  • the invention relates to a hydraulic control arrangement for a mobile work machine, with at least one hydraulic cylinder, with the aid of a working tool is movable, a directional control valve for controlling the pressure medium path between a pressure chamber of the cylinder, a pressure medium source and a tank, at least one between the directional control valve and the Pressure chamber of the cylinder looped safety valve which can be opened to adjust the cylinder, and with a pressure accumulator which is connectable to the pressure chamber of the cylinder on the cylinder side of the at least one safety valve.
  • Hoists such as front loaders, are mounted on vehicles and used for lifting and transporting loads. They have hydraulic cylinders for lifting and usually also for pivoting the load, which are supplied by releasable, flexible hoses from a carrier vehicle with pressurized hydraulic fluid. In order to prevent the load from falling down in the event of a hose break leading to the pressure drop in the cylinder holding the load, so-called load-holding or safety valves are used. These valves shut off the connection between the cylinder and the hose as long as the operator does not move the hoist.
  • the hydraulic cylinders of the hoists with serving as a vibration damper pressure accumulators, which are provided on the lifting or Absenkseite a cylinder or on both sides ( DE 197 34 658 A ).
  • Such pressure accumulators are connected to the vehicle-side connection point of the safety valves, since they are usually located on the vehicle and are connected by a hose to the safety valve.
  • the operator can deactivate the safety valve manually. He then takes responsibility for not performing any lifting operation. It is also conceivable to activate the safety valve depending on the speed of the vehicle. If with one is driven at a certain speed, it can be assumed that the vehicle is not in hoisting, but in transport mode. Then the pressure accumulator is effective only while driving.
  • the FR 2 052 052 A discloses a hydraulic control device for a hydraulic cylinder, which is in communication with two hydraulic accumulators and enable only one supply line by means of a combination of check valves, each communicating with a hydraulic accumulator, and a common pressure-controlled switching valve, a control of a hydraulic cylinder over extremely long distances should.
  • the check valves are safety valves, which are not switchable.
  • the US 5,921,010 A discloses a hydraulic arrangement for a working device, in particular for a hydraulically sprung clearing bucket.
  • the assembly includes a check valve which, in combination with a pressure limiting valve, constitutes a safety valve to maintain a presettable system pressure.
  • the safety valve or the check valve opens in the direction of a connected to a hydraulic tank and a hydraulic pump directional control valve and thus does not represent a hedge of a pressure drop in hose breakage.
  • the JP 59 073 602 A discloses a pressure compensating device for a hydraulic cylinder assembly.
  • a safety valve is used, which is openable for adjusting the cylinder via a pilot pressure line connected to the cylinder.
  • the disclosed pressure compensation device is limited to temperature-induced or leakage-induced pressure changes in the cylinder.
  • a hydraulic damping for the cylinder is not disclosed.
  • the object underlying the invention is seen to improve a lifting device with a safety valve to the effect that even with the safety valve off, a damping of the cylinder is possible, or that the safety valve is effective even with a damped cylinder remains.
  • a first and a second looped between the directional control valve and the pressure chamber of the cylinder safety valve is provided, one of the safety valves independently of the pressure in the chambers of the cylinder is electromagnetically remotely controllable switchable and wherein the safety valves a first switching position with a in Direction of the directional control valve closing check valve and a second switching position with a passage and are openable for adjusting the cylinder by switching from the first to the second switching position.
  • the accumulator is connected to the cylinder-facing side of the safety valve.
  • the accumulator can be connected directly or by a lockable, usually remotely controllable valve with the pressure chamber of the cylinder.
  • the valve allows to shut off the pressure accumulator if an operator would like to do without the exact positioning of the working tool on the effect of the pressure accumulator.
  • the pressure accumulator is expediently mechanically rigidly coupled to the cylinder and / or the safety valve, so that it moves with the cylinder and the safety valve and no hoses at risk of breakage are required.
  • the pressure accumulator is preferably exclusively by means of mechanically rigid Conduit elements, such as pipes and the like, connected to the pressure chamber of the cylinder. This avoids the risk of hose breaks, which would lead to the sudden drop in a load.
  • the line leading to the pressure accumulator may be connected to a second port of the pressure chamber of the cylinder, the first port of which is connected to the safety valve.
  • the pressure accumulator is integrated in the housing of the cylinder.
  • the hydraulic control arrangement according to the invention is explained using the example of a farm tractor with a front loader. However, it can be used on any work machine with movable work tools, such as wheel loaders, telescopic loaders, excavators and the like.
  • a hoist 10 shown in Figure 1 which is connected to the front of an agricultural tractor only hinted, a mast 12 is shown, which receives a lifting rocker 16 in a bearing 14, which is stiffened by means of a cross member 18 due to their double-armed design.
  • a working tool 20, z As a soil scoop, a Dunggabel, a bale fork or pallet fork is connected to the front end of the lifting rocker 16 by means of an adjusting device 30 and a tool holder 32 movable and replaceable.
  • the lifting rocker 16 is pivoted about the bearing 14 via hydraulic cylinders 26.
  • the adjusting device 30 acts on the tool holder 32, to which the working tool 20 is directly connected, and consists essentially of a first and a second pivot arm 34, 36, which are hinged together, wherein in the hinge point 44 of the cylinder 28 engages ,
  • the tool holder 32 is pivotally mounted in a bearing 38 and the first pivot arm 34 in a bearing 40 on the lifting rocker 16.
  • the second pivot arm 36 is pivotally connected to the tool holder 32 in a bearing 46. 48 is a latch for locking the working tool 20 is designated. In the upper portion of the tool holder 32, a hook 50 and a bolt 52 are provided, which bring the working tool 20 in engagement with the hoist 10.
  • FIG. 2 shows a diagram of a hydraulic control arrangement according to the invention for the working machine from FIG. 1 shown.
  • a pump as the pressure medium source 54 and a tank 56 for receiving a relaxed pressure medium are arranged.
  • the pump is connected to a coupling 62 via two directional control valves 58, 60 operable by the operator from the tractor cab.
  • the hydraulic connections of the hoist 10 are connected.
  • the single- or double-acting cylinder 26 are connected via the coupling 62 directly to the directional control valve 60, so that the working tool 20 can be raised and lowered by operating the directional control valve 60 in a conventional manner.
  • the other cylinders 28, however, are double-acting. Your piston chamber 64 is acted upon to pivot the working tool 20 upwards. Similarly, its piston rod chamber 66 is acted upon when the working tool 20 is to be pivoted downwards.
  • the per se known safety valve block 68 is provided in order to prevent inadvertent lowering of the working tool 20, if a flexible hose should break, which is arranged between the coupling 62 and the safety valve block 68 connected to the piston chamber 64.
  • the safety valve block 68 is provided with two cylinder-side connections, to each of which a piston chamber 64 of the cylinder 28 is connected.
  • the safety valve block 68 contains in each case a safety valve 70, 72 for the two possible directions of pressure flow.
  • the first safety valve 70 contains a check valve which opens when the pressure in the piston chamber 64 is less than the pressure at the associated connection of the coupling 62. It opens automatically, when the operator increases the pressure in the piston chamber 64 by operating the directional control valve 58. By an electromagnetic remote control, it is possible to switch the first safety valve 70 between the check valve and a passage, so that the safety valve 70 is switchable to constant passage.
  • the second safety valve 72 also includes a check valve that corresponds to that in the safety valve 70. Controlled by the pressure in the chambers 64, 66, the second safety valve can switch between the check valve and a passage.
  • the passage is thus automatically opened when the pressure in the piston rod chamber 66 is greater than the pressure in the piston chamber 64, ie, the cylinder 28 is to contract so that the pressure fluid from the piston chamber 64 can flow into the tank 56.
  • the safety valves 70, 72 are opened as a result, when the operator via the directional control valve 58 causes a movement of the cylinder 28 and otherwise closed.
  • the piston chamber of the right-hand cylinder 28 has two ports 76, 78.
  • the first port 76 is connected to the safety valve block 68.
  • a pneumatic pressure accumulator 74 is connected to the second connection 78 by rigid conduit elements. Mechanically, the pressure accumulator 74 is attached to the lifting rocker 16 or the cylinder 28.
  • the pressure accumulator 74 provides a permanent damping of the right-hand cylinder 28 and the first port 76 and the rigid connection 90 of the left-hand cylinder 28, even with closed safety valves 70, 72.
  • the accumulator 74 could also in the housing of the cylinder 28 close be arranged on the bottom side.
  • a second pneumatic accumulator 80 is connected to the piston rod chambers 66 of the cylinders 28 to provide further cushioning of the cylinders 28. Since the piston rod chambers 66 are safe in terms of safety because a pressure drop in them does not lead to a drop in the working tool 20, safety valves assigned to them are unnecessary.
  • the second pressure accumulator 80 may be attached to the lifting rocker 16 or to the frame of the tractor, flexible hoses are used.
  • FIG. 3 schematically shows a second embodiment of a hydraulic control arrangement. Elements that match the first embodiment are identified by the same reference numerals.
  • the two cylinders 28 are each assigned a safety valve block 68. Therefore, each cylinder 28 is also provided with a second port 78 and one thereon connected pressure accumulator 74, 74 'provided.
  • a common pressure accumulator 80 is provided for the piston rod side of the cylinder 28 but, as in the embodiment of Figure 2, only a common pressure accumulator 80 is provided.
  • the third embodiment of a hydraulic control arrangement according to the invention shown in FIG. 4 differs from that according to FIG. 3 in that the cylinders 28 have only a single connection 76 and that the pressure accumulators 74, 74 'are each connected to a connection 82 of the associated safety valve block 68 , The port 82 is connected to the port 76 within the safety valve block 68. This saves you the second port 78 of the cylinder 28th
  • FIG. 5 schematically shows a fourth embodiment of a hydraulic control arrangement according to the invention. It essentially corresponds to the embodiment according to FIG. 3, but the pressure accumulators 74, 74 ', 80 can be switched off by valve arrangements 84.
  • the valve assemblies 84 include check valves 86 which open if the pressure in the pressure accumulator 74, 74 ', 80 is less than the pressure in the associated cylinder chamber. This prevents unwanted movements of the cylinder 28 when you turn on the accumulator.
  • valve assemblies 84 include electromagnetic remotely controllable directional control valves 88 which are movable between a passage position in which the pressure accumulators 74, 74 ', 80 are connected to the associated cylinder chambers, and a blocking position in which the pressure accumulators are separated from the cylinder chambers.
  • the valve assemblies 84 allow the pressure accumulators to be shut off if the operator desires to adjust the work tool 20 with increased accuracy.
  • the cylinder 26 could also be cushioned by pressure accumulators as shown.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

The control circuit for a bucket excavator has a hydraulic actuating cylinder (28) for the bucket (20). a multiple way valve (58) controls pressure fluid flow between the cylinder, a pump and a tank. A safety valve is incorporated between the valve and the cylinder. A pressure reservoir (74,74') is connectable on the cylinder side of the safety valve with the cylinder. The pressure reservoir can be connected with the cylinder by a remotely controlled valve.

Description

Die Erfindung betrifft eine hydraulische Steueranordnung für eine mobile Arbeitsmaschine, mit mindestens einem hydraulischen Zylinder, mit dessen Hilfe ein Arbeitswerkzeug bewegbar ist, einem Wegeventil zur Steuerung des Druckmittelwegs zwischen einem Druckraum des Zylinders, einer Druckmittelquelle und einem Tank, wenigstens einem zwischen dem Wegeventil und dem Druckraum des Zylinders eingeschleiften Sicherheitsventil, das zur Verstellung des Zylinders öffenbar ist, und mit einem Druckspeicher, der mit dem Druckraum des Zylinders auf der Zylinderseite des wenigstens einen Sicherheitsventils verbindbar ist.The invention relates to a hydraulic control arrangement for a mobile work machine, with at least one hydraulic cylinder, with the aid of a working tool is movable, a directional control valve for controlling the pressure medium path between a pressure chamber of the cylinder, a pressure medium source and a tank, at least one between the directional control valve and the Pressure chamber of the cylinder looped safety valve which can be opened to adjust the cylinder, and with a pressure accumulator which is connectable to the pressure chamber of the cylinder on the cylinder side of the at least one safety valve.

Hubwerke, beispielsweise Frontlader, werden an Fahrzeuge angebaut und zum Anheben und Transportieren von Lasten verwendet. Sie weisen hydraulische Zylinder zum Anheben und in der Regel auch zum Verschwenken der Last auf, die durch lösbare, flexible Schläuche von einem Trägerfahrzeug mit unter Druck stehendem Hydraulikfluid versorgt werden. Um zu verhindern, dass die Last im Falle eines Schlauchbruchs, der zum Abfallen des Drucks in dem die Last haltenden Zylinder führt, herunterfällt, werden so genannte Lasthalte- oder Sicherheitsventile verwendet. Diese Ventile sperren die Verbindung zwischen dem Zylinder und dem Schlauch ab, solange der Bediener keine Bewegung des Hubwerks veranlasst.Hoists, such as front loaders, are mounted on vehicles and used for lifting and transporting loads. They have hydraulic cylinders for lifting and usually also for pivoting the load, which are supplied by releasable, flexible hoses from a carrier vehicle with pressurized hydraulic fluid. In order to prevent the load from falling down in the event of a hose break leading to the pressure drop in the cylinder holding the load, so-called load-holding or safety valves are used. These valves shut off the connection between the cylinder and the hose as long as the operator does not move the hoist.

Weiterhin ist es möglich, die hydraulischen Zylinder der Hubwerke mit als Schwingungsdämpfer dienenden Druckspeichern zu verbinden, die an der Hub- oder Absenkseite eines Zylinders oder an beiden Seiten vorgesehen sind ( DE 197 34 658 A ). Derartige Druckspeicher werden an der fahrzeugseitigen Anschlussstelle der Sicherheitsventile angeschlossen, da sie sich in der Regel am Fahrzeug befinden und durch einen Schlauch mit dem Sicherheitsventil verbunden sind. Um auch bei abgeschaltetem Sicherheitsventil eine Dämpfung zu erhalten, kann der Bediener das Sicherheitsventil manuell deaktivieren. Er übernimmt dann die Verantwortung dafür, dass er keine Huboperation durchführt. Es ist auch denkbar, das Sicherheitsventil abhängig von der Geschwindigkeit des Fahrzeugs zu aktivieren. Wenn mit einer bestimmten Geschwindigkeit gefahren wird, kann davon ausgegangen werden, dass sich das Fahrzeug nicht im Hub-, sondern im Transportbetrieb befindet. Dann ist der Druckspeicher nur im Fahrbetrieb wirksam.Furthermore, it is possible to connect the hydraulic cylinders of the hoists with serving as a vibration damper pressure accumulators, which are provided on the lifting or Absenkseite a cylinder or on both sides ( DE 197 34 658 A ). Such pressure accumulators are connected to the vehicle-side connection point of the safety valves, since they are usually located on the vehicle and are connected by a hose to the safety valve. In order to obtain damping even when the safety valve is switched off, the operator can deactivate the safety valve manually. He then takes responsibility for not performing any lifting operation. It is also conceivable to activate the safety valve depending on the speed of the vehicle. If with one is driven at a certain speed, it can be assumed that the vehicle is not in hoisting, but in transport mode. Then the pressure accumulator is effective only while driving.

Die FR 2 052 052 A offenbart eine hydraulische Steuereinrichtung für einen Hydraulikzylinder, der in Verbindung mit zwei Hydraulikspeichern steht und über nur eine Versorgungsleitung mittels einer Kombination aus Rückschlagventilen, die jeweils mit einem Hydraulispeicher in Verbindung stehen, und einem gemeinsamen druckgesteuerten Schaltventil, eine Ansteuerung eines Hydraulikzylinders über extrem weite Distanzen ermöglichen soll. Die Rückschlagventile stellen Sicherheitsventile dar, die jedoch nicht schaltbar sind.The FR 2 052 052 A discloses a hydraulic control device for a hydraulic cylinder, which is in communication with two hydraulic accumulators and enable only one supply line by means of a combination of check valves, each communicating with a hydraulic accumulator, and a common pressure-controlled switching valve, a control of a hydraulic cylinder over extremely long distances should. The check valves are safety valves, which are not switchable.

Die US 5 921 010 A offenbart eine hydraulische Anordnung für ein Arbeitsgerät insbesondere für eine hydraulisch gefederte Räumungsschaufel. Die Anordnung weist ein Rückschlagventil auf, welches in Kombination mit einem Druckbegrenzungsventil ein Sicherheitsventil darstellt, um einen voreinstellbaren Systemdruck zu halten. Das Sicherheitsventil bzw. das Rückschlagventil öffnet in Richtung eines mit einem Hydrauliktank und einer Hydraulikpumpe verbundenen Wegeventils und stellt somit keine Absicherung eines Druckabfalls bei Schlauchbruch dar.The US 5,921,010 A discloses a hydraulic arrangement for a working device, in particular for a hydraulically sprung clearing bucket. The assembly includes a check valve which, in combination with a pressure limiting valve, constitutes a safety valve to maintain a presettable system pressure. The safety valve or the check valve opens in the direction of a connected to a hydraulic tank and a hydraulic pump directional control valve and thus does not represent a hedge of a pressure drop in hose breakage.

Die JP 59 073 602 A offenbart eine Druckkompensationseinrichtung für eine hydraulische Zylinderanordnung. Hierbei wird ein Sicherheitsventil eingesetzt, welches zum Verstellen des Zylinders über eine mit dem Zylinder verbundene Pilotdruckleitung öffenbar ist. Die offenbarte Druckkompensationseinrichtung beschränkt sich auf temperaturbedingte oder leckagebedingte Druckänderungen im Zylinder. Eine hydraulische Dämpfung für den Zylinder wird nicht offenbart.The JP 59 073 602 A discloses a pressure compensating device for a hydraulic cylinder assembly. Here, a safety valve is used, which is openable for adjusting the cylinder via a pilot pressure line connected to the cylinder. The disclosed pressure compensation device is limited to temperature-induced or leakage-induced pressure changes in the cylinder. A hydraulic damping for the cylinder is not disclosed.

Die der Erfindung zugrunde liegende Aufgabe wird darin gesehen, eine Lasthebeanrichtung mit einem Sicherheitsventil dahingehend zu verbessern, dass auch bei abgeschaltetem Sicherheitsventil eine Dämpfung des Zylinders möglich ist, bzw. dass das Sicherheitsventil auch bei einem gedämpften Zylinder wirksam bleibt.The object underlying the invention is seen to improve a lifting device with a safety valve to the effect that even with the safety valve off, a damping of the cylinder is possible, or that the safety valve is effective even with a damped cylinder remains.

Diese Aufgabe wird erfindungsgemäß durch die Lehre des Patentanspruchs 1 gelöst, wobei in den weiteren Patentansprüchen Merkmale aufgeführt sind, die die Lösung in vorteilhafter Weise weiterentwickeln.This object is achieved by the teaching of claim 1, wherein in the other claims features are listed, which further develop the solution in an advantageous manner.

Es wird vorgeschlagen, dass ein erstes und ein zweites zwischen dem Wegeventil und dem Druckraum des Zylinders eingeschleiftes Sicherheitsventil vorgesehen ist, wobei eines der Sicherheitsventile unabhängig von dem Druck in den Kammern des Zylinders elektromagnetisch fernsteuerbar schaltbar ist und wobei die Sicherheitsventile eine erste Schaltstellung mit einem in Richtung des Wegeventils schließenden Rückschlagventil und eine zweite Schaltstellung mit einem Durchlass enthalten und zur Verstellung des Zylinders durch Umschalten von der ersten in die zweite Schaltstellung öffenbar sind. Der Druckspeicher ist auf der dem Zylinder zugewandten Seite des Sicherheitsventils angeschlossen. Auf diese Weise erreicht man, dass auch bei einem aktiven, d.h. abgesperrten Sicherheitsventil eine Dämpfung erzielt wird. Es ist somit stets eine Dämpfung des Arbeitswerkzeugs möglich, ohne dass das Sicherheitsventil manuell außer Betrieb gesetzt oder mit einer Mindestgeschwindigkeit gefahren werden müsste.It is proposed that a first and a second looped between the directional control valve and the pressure chamber of the cylinder safety valve is provided, one of the safety valves independently of the pressure in the chambers of the cylinder is electromagnetically remotely controllable switchable and wherein the safety valves a first switching position with a in Direction of the directional control valve closing check valve and a second switching position with a passage and are openable for adjusting the cylinder by switching from the first to the second switching position. The accumulator is connected to the cylinder-facing side of the safety valve. In this way one achieves that even with an active, i. shut off safety valve damping is achieved. It is thus always a damping of the working tool possible without the safety valve should be manually put out of operation or driven at a minimum speed.

Der Druckspeicher kann direkt oder durch ein absperrbares, in der Regel fernsteuerbares Ventil mit dem Druckraum des Zylinders verbunden werden. Das Ventil ermöglicht, den Druckspeicher abzuschalten, falls ein Bediener zur exakteren Positionierung des Arbeitswerkzeugs auf die Wirkung des Druckspeichers verzichten möchte.The accumulator can be connected directly or by a lockable, usually remotely controllable valve with the pressure chamber of the cylinder. The valve allows to shut off the pressure accumulator if an operator would like to do without the exact positioning of the working tool on the effect of the pressure accumulator.

Der Druckspeicher ist zweckmäßigerweise mechanisch starr mit dem Zylinder und/oder dem Sicherheitsventil gekoppelt, so dass er sich mit dem Zylinder und dem Sicherheitsventil bewegt und keine bruchgefährdeten Schläuche erforderlich sind. Der Druckspeicher wird vorzugsweise ausschließlich mittels mechanisch starrer Leitungselemente, wie Rohre und dergleichen, mit dem Druckraum des Zylinders verbunden. Dadurch vermeidet man das Risiko von Schlauchbrüchen, die zum plötzlichen Absinken einer Last führen würden.The pressure accumulator is expediently mechanically rigidly coupled to the cylinder and / or the safety valve, so that it moves with the cylinder and the safety valve and no hoses at risk of breakage are required. The pressure accumulator is preferably exclusively by means of mechanically rigid Conduit elements, such as pipes and the like, connected to the pressure chamber of the cylinder. This avoids the risk of hose breaks, which would lead to the sudden drop in a load.

Im Einzelnen kann die zum Druckspeicher führende Leitung mit einem zweiten Anschluss des Druckraums des Zylinders verbunden sein, dessen erster Anschluss mit dem Sicherheitsventil verbunden ist. Es ist aber auch die Verwendung eines T-Stücks in der Leitung zwischen Sicherheitsventil und Druckraum zum Anschluss des Druckspeichers denkbar, oder die Verwendung eines zusätzlichen Anschlusses des Sicherheitsventils oder -blocks. In einer anderen Ausführungsform ist der Druckspeicher in das Gehäuse des Zylinders integriert.In detail, the line leading to the pressure accumulator may be connected to a second port of the pressure chamber of the cylinder, the first port of which is connected to the safety valve. But it is also the use of a tee in the line between the safety valve and the pressure chamber for connecting the pressure accumulator conceivable, or the use of an additional port of the safety valve or block. In another embodiment, the pressure accumulator is integrated in the housing of the cylinder.

In den Zeichnungen sind vier nachfolgend näher beschriebene Ausführungsbeispiele der Erfindung dargestellt. Es zeigt:

Fig. 1
ein Hubwerk mit einem Arbeitswerkzeug in Seitenansicht,
Fig. 2
ein Schema einer ersten Ausführungsform einer erfindungsgemäßen Steueranordnung, bei der ein Druckspeicher mit einem Sicherheitsventil und zwei Zylindern verbunden ist,
Fig. 3
ein Schema einer zweiten Ausführungsform einer erfindungsgemäßen Steueranordnung, bei der ein Druckspeicher mit einem Sicherheitsventil und einem Zylinder verbunden ist,
Fig. 4
ein Schema einer dritten Ausführungsform einer erfindungsgemäßen Steueranordnung, bei der ein Druckspeicher direkt mit einem Sicherheitsventil verbunden ist, und
Fig. 5
ein Schema einer vierten Ausführungsform einer erfindungsgemäßen Steueranordnung, bei der ein absperrbarer Druckspeicher mit einem Sicherheitsventil und einem Zylinder verbunden ist.
In the drawings, four embodiments of the invention described in more detail below are shown. It shows:
Fig. 1
a hoist with a working tool in side view,
Fig. 2
a diagram of a first embodiment of a control arrangement according to the invention, in which a pressure accumulator is connected to a safety valve and two cylinders,
Fig. 3
a diagram of a second embodiment of a control arrangement according to the invention, in which a pressure accumulator is connected to a safety valve and a cylinder,
Fig. 4
a diagram of a third embodiment of a control arrangement according to the invention, in which a pressure accumulator is connected directly to a safety valve, and
Fig. 5
a diagram of a fourth embodiment of a control arrangement according to the invention, in which a lockable pressure accumulator is connected to a safety valve and a cylinder.

Die erfindungsgemäße hydraulische Steueranordnung wird am Beispiel eines Ackerschleppers mit Frontlader erläutert. Sie kann jedoch an beliebigen Arbeitsmaschinen mit beweglichen Arbeitswerkzeugen verwendet werden, wie Radladern, Teleskopladern, Baggern und dergleichen. Von einem in Figur 1 gezeigten Hubwerk 10, das frontseitig an einen nur angedeuteten Ackerschlepper angeschlossen ist, ist ein Mast 12 abgebildet, der in einem Lager 14 eine Hubschwinge 16 aufnimmt, die aufgrund ihrer doppelarmigen Ausführung mittels eines Querträgers 18 versteift wird. Ein Arbeitswerkzeug 20, z. B. eine Erdschaufel, eine Dunggabel, eine Ballengabel oder eine Palettengabel ist an dem frontseitigen Ende der Hubschwinge 16 mittels einer Stellvorrichtung 30 und einem Werkzeughalter 32 beweglich und auswechselbar angeschlossen. Um das Arbeitswerkzeug 20 anzuheben, wird die Hubschwinge 16 über hydraulische Zylinder 26 um das Lager 14 geschwenkt. Zur Verstellung der Neigung des Arbeitswerkzeugs 20 greift an der Stellvorrichtung 30 einen Endes und an der Hubschwinge 16 anderen Endes ein weiterer hydraulischer Zylinder 28 an. An beiden Seiten der Hubschwinge 16 sind je ein Zylinder 26 und 28 angeordnet. Die Stellvorrichtung 30 wirkt auf den Werkzeughalter 32, an den das Arbeitswerkzeug 20 direkt angeschlossen wird, und setzt sich im Wesentlichen aus einem ersten und einem zweiten Schwenkarm 34, 36 zusammen, die gelenkig miteinander verbunden sind, wobei in der Gelenkstelle 44 der Zylinder 28 angreift. Der Werkzeughalter 32 ist in einem Lager 38 und der erste Schwenkarm 34 in einem Lager 40 an der Hubschwinge 16 schwenkbar gelagert. Der zweite Schwenkarm 36 ist in einem Lager 46 schwenkbar mit dem Werkzeughalter 32 verbunden. Mit 48 ist ein Riegel zum Verrasten des Arbeitswerkzeugs 20 bezeichnet. Im oberen Abschnitt des Werkzeughalters 32 sind ein Haken 50 und ein Bolzen 52 vorgesehen, die das Arbeitswerkzeug 20 in Eingriff mit dem Hubwerk 10 bringen.The hydraulic control arrangement according to the invention is explained using the example of a farm tractor with a front loader. However, it can be used on any work machine with movable work tools, such as wheel loaders, telescopic loaders, excavators and the like. From a hoist 10 shown in Figure 1, which is connected to the front of an agricultural tractor only hinted, a mast 12 is shown, which receives a lifting rocker 16 in a bearing 14, which is stiffened by means of a cross member 18 due to their double-armed design. A working tool 20, z. As a soil scoop, a Dunggabel, a bale fork or pallet fork is connected to the front end of the lifting rocker 16 by means of an adjusting device 30 and a tool holder 32 movable and replaceable. In order to raise the working tool 20, the lifting rocker 16 is pivoted about the bearing 14 via hydraulic cylinders 26. To adjust the inclination of the working tool 20 engages the adjusting device 30 at one end and the lifting rocker 16 at the other end another hydraulic cylinder 28 at. On both sides of the lifting rocker 16 are each a cylinder 26 and 28 are arranged. The adjusting device 30 acts on the tool holder 32, to which the working tool 20 is directly connected, and consists essentially of a first and a second pivot arm 34, 36, which are hinged together, wherein in the hinge point 44 of the cylinder 28 engages , The tool holder 32 is pivotally mounted in a bearing 38 and the first pivot arm 34 in a bearing 40 on the lifting rocker 16. The second pivot arm 36 is pivotally connected to the tool holder 32 in a bearing 46. 48 is a latch for locking the working tool 20 is designated. In the upper portion of the tool holder 32, a hook 50 and a bolt 52 are provided, which bring the working tool 20 in engagement with the hoist 10.

In der Figur 2 ist ein Schema einer erfindungsgemäßen hydraulischen Steueranordnung für die Arbeitsmaschine aus Figur 1 dargestellt. Auf dem Ackerschlepper sind eine Pumpe als Druckmittelquelle 54 und ein Tank 56 zur Aufnahme entspannten Druckmittels angeordnet. Die Pumpe ist über zwei vom Bediener von der Kabine des Ackerschleppers aus betätigbare Wegeventile 58, 60 mit einer Kupplung 62 verbunden. An der lösbaren Kupplung 62 sind die Hydraulikanschlüsse des Hubwerks 10 angeschlossen. Die einfach- oder doppeltwirkenden Zylinder 26 sind über die Kupplung 62 direkt mit dem Wegeventil 60 verbunden, so dass das Arbeitswerkzeug 20 durch Betätigung des Wegeventils 60 in an sich bekannter Weise angehoben und abgesenkt werden kann.FIG. 2 shows a diagram of a hydraulic control arrangement according to the invention for the working machine from FIG. 1 shown. On the farm tractor, a pump as the pressure medium source 54 and a tank 56 for receiving a relaxed pressure medium are arranged. The pump is connected to a coupling 62 via two directional control valves 58, 60 operable by the operator from the tractor cab. At the releasable coupling 62, the hydraulic connections of the hoist 10 are connected. The single- or double-acting cylinder 26 are connected via the coupling 62 directly to the directional control valve 60, so that the working tool 20 can be raised and lowered by operating the directional control valve 60 in a conventional manner.

Die weiteren Zylinder 28 sind hingegen doppeltwirkend. Ihre Kolbenkammer 64 wird beaufschlagt, um das Arbeitswerkzeug 20 nach oben zu verschwenken. Analog wird ihre Kolbenstangenkammer 66 beaufschlagt, wenn das Arbeitswerkzeug 20 nach unten verschwenkt werden soll. Um ein unbeabsichtigtes Absinken des Arbeitswerkzeugs 20 zu verhindern, falls ein flexibler Schlauch brechen sollte, der zwischen der Kupplung 62 und dem mit der Kolbenkammer 64 verbundenen Sicherheitsventilblock 68 angeordnet ist, ist der an sich bekannte Sicherheitsventilblock 68 vorgesehen. Der Sicherheitsventilblock 68 ist mit zwei zylinderseitigen Anschlüssen versehen, an denen jeweils eine Kolbenkammer 64 der Zylinder 28 angeschlossen ist. Der Sicherheitsventilblock 68 enthält für die beiden möglichen Druckmittelflussrichtungen jeweils ein Sicherheitsventil 70, 72. Das erste Sicherheitsventil 70 enthält ein Rückschlagventil, das öffnet, wenn der Druck in der Kolbenkammer 64 kleiner ist als der Druck am zugeordneten Anschluss der Kupplung 62. Es öffnet selbsttätig, wenn der Bediener den Druck im Kolbenraum 64 durch Betätigung des Wegeventils 58 erhöht. Durch eine elektromagnetische Fernsteuerung besteht die Möglichkeit, das erste Sicherheitsventil 70 zwischen dem Rückschlagventil und einem Durchlass umzuschalten, so dass das Sicherheitsventil 70 auf konstanten Durchlass schaltbar ist. Das zweite Sicherheitsventil 72 enthält ebenfalls ein Rückschlagventil, das dem im Sicherheitsventil 70 entspricht. Durch den Druck in den Kammern 64, 66 gesteuert kann das zweite Sicherheitsventil zwischen dem Rückschlagventil und einem Durchlass umschalten. Der Durchlass wird somit selbsttätig geöffnet, wenn der Druck in der Kolbenstangenkammer 66 größer als der Druck in der Kolbenkammer 64 ist, d.h. der Zylinder 28 sich zusammenziehen soll, damit das Druckmittel aus der Kolbenkammer 64 in den Tank 56 abfließen kann. Die Sicherheitsventile 70, 72 sind im Ergebnis geöffnet, wenn der Bediener über das Wegeventil 58 eine Bewegung des Zylinders 28 veranlasst und ansonsten geschlossen.The other cylinders 28, however, are double-acting. Your piston chamber 64 is acted upon to pivot the working tool 20 upwards. Similarly, its piston rod chamber 66 is acted upon when the working tool 20 is to be pivoted downwards. In order to prevent inadvertent lowering of the working tool 20, if a flexible hose should break, which is arranged between the coupling 62 and the safety valve block 68 connected to the piston chamber 64, the per se known safety valve block 68 is provided. The safety valve block 68 is provided with two cylinder-side connections, to each of which a piston chamber 64 of the cylinder 28 is connected. The safety valve block 68 contains in each case a safety valve 70, 72 for the two possible directions of pressure flow. The first safety valve 70 contains a check valve which opens when the pressure in the piston chamber 64 is less than the pressure at the associated connection of the coupling 62. It opens automatically, when the operator increases the pressure in the piston chamber 64 by operating the directional control valve 58. By an electromagnetic remote control, it is possible to switch the first safety valve 70 between the check valve and a passage, so that the safety valve 70 is switchable to constant passage. The second safety valve 72 also includes a check valve that corresponds to that in the safety valve 70. Controlled by the pressure in the chambers 64, 66, the second safety valve can switch between the check valve and a passage. The passage is thus automatically opened when the pressure in the piston rod chamber 66 is greater than the pressure in the piston chamber 64, ie, the cylinder 28 is to contract so that the pressure fluid from the piston chamber 64 can flow into the tank 56. The safety valves 70, 72 are opened as a result, when the operator via the directional control valve 58 causes a movement of the cylinder 28 and otherwise closed.

Die Kolbenkammer des rechts eingezeichneten Zylinders 28 weist zwei Anschlüsse 76, 78 auf. Der erste Anschluss 76 ist mit dem Sicherheitsventilblock 68 verbunden. Mit dem zweiten Anschluss 78 ist durch starre Leitungselemente ein pneumatischer Druckspeicher 74 verbunden. Mechanisch ist der Druckspeicher 74 an der Hubschwinge 16 oder am Zylinder 28 befestigt. Der Druckspeicher 74 stellt eine permanente Dämpfung des rechts eingezeichneten Zylinders 28 und über den ersten Anschluss 76 und die starre Verbindung 90 auch des links eingezeichneten Zylinders 28 bereit, auch bei geschlossenen Sicherheitsventilen 70, 72. Der Druckspeicher 74 könnte auch im Gehäuse des Zylinders 28 nahe der Bodenseite angeordnet sein.The piston chamber of the right-hand cylinder 28 has two ports 76, 78. The first port 76 is connected to the safety valve block 68. A pneumatic pressure accumulator 74 is connected to the second connection 78 by rigid conduit elements. Mechanically, the pressure accumulator 74 is attached to the lifting rocker 16 or the cylinder 28. The pressure accumulator 74 provides a permanent damping of the right-hand cylinder 28 and the first port 76 and the rigid connection 90 of the left-hand cylinder 28, even with closed safety valves 70, 72. The accumulator 74 could also in the housing of the cylinder 28 close be arranged on the bottom side.

Ein zweiter pneumatischer Druckspeicher 80 ist mit den Kolbenstangenkammern 66 der Zylinder 28 verbunden, um eine weitere Dämpfung der Zylinder 28 bereitzustellen. Da die Kolbenstangenkammern 66 sicherheitstechnisch unbedenklich sind, weil ein Druckabfall in ihnen nicht zum Absinken des Arbeitswerkzeugs 20 führt, erübrigen sich ihnen zugeordnete Sicherheitsventile. Der zweite Druckspeicher 80 kann an der Hubschwinge 16 oder am Rahmen des Ackerschleppers befestigt sein, wobei flexible Schläuche verwendbar sind.A second pneumatic accumulator 80 is connected to the piston rod chambers 66 of the cylinders 28 to provide further cushioning of the cylinders 28. Since the piston rod chambers 66 are safe in terms of safety because a pressure drop in them does not lead to a drop in the working tool 20, safety valves assigned to them are unnecessary. The second pressure accumulator 80 may be attached to the lifting rocker 16 or to the frame of the tractor, flexible hoses are used.

In der Figur 3 ist eine zweite Ausführungsform einer hydraulischen Steueranordnung schematisch dargestellt. Mit der ersten Ausführungsform übereinstimmende Elemente sind mit denselben Bezugsziffern gekennzeichnet. Im Unterschied zur Ausführungsform nach Figur 2 ist den beiden Zylindern 28 jeweils ein Sicherheitsventilblock 68 zugeordnet. Daher ist auch jeder Zylinder 28 mit einem zweiten Anschluss 78 und einem daran angeschlossenen Druckspeicher 74, 74' versehen. Für die Kolbenstangenseite der Zylinder 28 ist aber, wie in der Ausführungsform nach Figur 2, nur ein gemeinsamer Druckspeicher 80 vorgesehen.FIG. 3 schematically shows a second embodiment of a hydraulic control arrangement. Elements that match the first embodiment are identified by the same reference numerals. In contrast to the embodiment according to FIG. 2, the two cylinders 28 are each assigned a safety valve block 68. Therefore, each cylinder 28 is also provided with a second port 78 and one thereon connected pressure accumulator 74, 74 'provided. For the piston rod side of the cylinder 28 but, as in the embodiment of Figure 2, only a common pressure accumulator 80 is provided.

Die in Figur 4 dargestellte dritte Ausführungsform einer erfindungsgemäßen hydraulischen Steueranordnung unterscheidet sich von der gemäß Figur 3 dadurch, dass die Zylinder 28 nur einen einzigen Anschluss 76 besitzen, und dass die Druckspeicher 74, 74' mit je einem Anschluss 82 des zugehörigen Sicherheitsventiblocks 68 verbunden sind. Der Anschluss 82 ist innerhalb des Sicherheitsventilblocks 68 mit dem Anschluss 76 verbunden. Dadurch erspart man sich den zweiten Anschluss 78 der Zylinder 28.The third embodiment of a hydraulic control arrangement according to the invention shown in FIG. 4 differs from that according to FIG. 3 in that the cylinders 28 have only a single connection 76 and that the pressure accumulators 74, 74 'are each connected to a connection 82 of the associated safety valve block 68 , The port 82 is connected to the port 76 within the safety valve block 68. This saves you the second port 78 of the cylinder 28th

In der Figur 5 ist eine vierte Ausführungsform einer erfindungsgemäßen hydraulischen Steueranordnung schematisch dargestellt. Sie entspricht im Wesentlichen der Ausführungsform gemäß Figur 3, jedoch sind die Druckspeicher 74, 74', 80 durch Ventilanordnungen 84 abschaltbar. Die Ventilanordnungen 84 umfassen Rückschlagventile 86, welche öffnen, falls der Druck im Druckspeicher 74, 74', 80 kleiner ist als der Druck in der zugehörigen Zylinderkammer. Dadurch verhindert man ungewünschte Bewegungen des Zylinders 28 beim Einschalten der Druckspeicher. Außerdem umfassen die Ventilanordnungen 84 elektromagnetisch fernsteuerbare Wegeventile 88, die zwischen einer Durchlassposition, in der die Druckspeicher 74, 74', 80 mit den zugehörigen Zylinderkammern verbunden sind, und einer Sperrposition bewegbar sind, in der die Druckspeicher von den Zylinderkammern getrennt sind. Die Ventilanordnungen 84 ermöglichen, die Druckspeicher abzusperren, falls der Bediener das Arbeitswerkzeug 20 mit erhöhter Genauigkeit verstellen möchte.FIG. 5 schematically shows a fourth embodiment of a hydraulic control arrangement according to the invention. It essentially corresponds to the embodiment according to FIG. 3, but the pressure accumulators 74, 74 ', 80 can be switched off by valve arrangements 84. The valve assemblies 84 include check valves 86 which open if the pressure in the pressure accumulator 74, 74 ', 80 is less than the pressure in the associated cylinder chamber. This prevents unwanted movements of the cylinder 28 when you turn on the accumulator. In addition, the valve assemblies 84 include electromagnetic remotely controllable directional control valves 88 which are movable between a passage position in which the pressure accumulators 74, 74 ', 80 are connected to the associated cylinder chambers, and a blocking position in which the pressure accumulators are separated from the cylinder chambers. The valve assemblies 84 allow the pressure accumulators to be shut off if the operator desires to adjust the work tool 20 with increased accuracy.

Anzumerken ist, dass anstelle der oder zusätzlich zu den Zylindern 28 auch der bzw. die Zylinder 26 in der dargestellten Weise durch Druckspeicher abgefedert werden könnte(n).It should be noted that instead of or in addition to the cylinders 28, the cylinder 26 could also be cushioned by pressure accumulators as shown.

Claims (5)

  1. Hydraulic control arrangement for a mobile working machine, having at least one hydraulic cylinder (28), by means of which a working tool (20) may be moved, a directional control valve (58) for controlling the pressure medium path between a pressure chamber of the cylinder (28), a pressure medium source (54) and a tank (56), at least one safety valve (70, 72) connected between the directional control valve (58) and the pressure chamber (64) of the cylinder (28), which valve may be opened for adjustment of the cylinder (28), and having a pressure accumulator (74, 74'), which may be connected to the pressure chamber (64) of the cylinder (28) on the cylinder side of the at least one safety valve (70, 72), characterized in that a first and a second safety valve (70, 72) connected between the directional control valve (58) and the pressure chamber (64) of the cylinder (28) are provided, one of the safety valves (70) being electromagnetically switchable under remote control irrespective of the pressure in the chambers (64, 66) of the cylinder (28) and the safety valves (70, 72) including a first switch position with a nonreturn valve which closes in the direction of the directional control valve (58) and a second switch position with a passage and being openable for adjustment of the cylinder (28) by changeover from the first into the second switch position.
  2. Control arrangement according to Claim 1, characterized in that the pressure accumulator (74, 74') is connected to the pressure chamber (64) of the cylinder (28) directly or by an in particular remote-controllable shutoff valve (88).
  3. Control arrangement according to Claim 1 or 2, characterized in that the pressure accumulator (74, 74') is connected to the pressure chamber (64) of the cylinder (28) solely by mechanically rigid line elements.
  4. Control arrangement according to one of Claims 1 to 3, characterized in that the pressure accumulator (74, 74') is connected to a second connection (78) of the pressure chamber (64) of the cylinder (28).
  5. Control arrangement according to one of Claims 1 to 3, characterized in that the pressure accumulator (74, 74') is connected to a connection (82) of a safety valve block (68) containing the safety valves (70, 72).
EP03013909A 2002-06-22 2003-06-20 Hydraulic control system for a working machine Expired - Lifetime EP1375926B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10227966 2002-06-22
DE10227966A DE10227966A1 (en) 2002-06-22 2002-06-22 Hydraulic control arrangement for a mobile machine

Publications (2)

Publication Number Publication Date
EP1375926A1 EP1375926A1 (en) 2004-01-02
EP1375926B1 true EP1375926B1 (en) 2007-12-05

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EP03013909A Expired - Lifetime EP1375926B1 (en) 2002-06-22 2003-06-20 Hydraulic control system for a working machine

Country Status (5)

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US (1) US6951103B2 (en)
EP (1) EP1375926B1 (en)
AT (1) ATE380297T1 (en)
CA (1) CA2433120C (en)
DE (2) DE10227966A1 (en)

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Also Published As

Publication number Publication date
DE10227966A1 (en) 2004-01-08
DE50308718D1 (en) 2008-01-17
EP1375926A1 (en) 2004-01-02
US6951103B2 (en) 2005-10-04
CA2433120C (en) 2007-02-27
ATE380297T1 (en) 2007-12-15
CA2433120A1 (en) 2003-12-22
US20040006980A1 (en) 2004-01-15

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