EP2829504A1 - Procédé de commande d'une machine de travail et système hydraulique pour une plate-forme élévatrice - Google Patents

Procédé de commande d'une machine de travail et système hydraulique pour une plate-forme élévatrice Download PDF

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Publication number
EP2829504A1
EP2829504A1 EP13177582.7A EP13177582A EP2829504A1 EP 2829504 A1 EP2829504 A1 EP 2829504A1 EP 13177582 A EP13177582 A EP 13177582A EP 2829504 A1 EP2829504 A1 EP 2829504A1
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EP
European Patent Office
Prior art keywords
pressure
working
machine
valve
line
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.)
Withdrawn
Application number
EP13177582.7A
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German (de)
English (en)
Inventor
Marco Hanebrink
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.)
Palfinger Platforms GmbH
Original Assignee
Palfinger Platforms GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Palfinger Platforms GmbH filed Critical Palfinger Platforms GmbH
Priority to EP13177582.7A priority Critical patent/EP2829504A1/fr
Publication of EP2829504A1 publication Critical patent/EP2829504A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
    • 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
    • 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"
    • F15B11/0445—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" with counterbalance valves, e.g. to prevent overrunning or for braking
    • 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
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing 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
    • F15B2211/50—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
    • F15B2211/5059—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves using double 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve

Definitions

  • the invention relates to a method for controlling a working machine of a, at least one working machine and at least one, in particular designed as a pump, drive machine, comprehensive hydraulic system of an aerial work platform, wherein the machine to be controlled is designed in particular as a hydraulic cylinder, wherein each machine by means of two, depending on Operating state of the working machine serving as an inlet or return, connections via corresponding working lines directly or indirectly connected to at least one of the prime movers, and wherein in at least one working line a lowering brake valve is provided which is connected via a control line to the other working line such that the Lowering brake valve is displaced from its locking position against a restoring force by the pressure prevailing in the other working line and passed over the control line pressure in a flow position.
  • Aerial work platforms are usually movable. For example, they can be mounted on a vehicle or have their own chassis. The vertical projection of the The load center can be located on an aerial work platform both inside and outside the tilting edge.
  • Aerial work platforms have a variety of hydraulic cylinders designed as working machines. For example, they serve to extend arms or supports. Also, they are used for extending a lifting arm or a Korbarms.
  • the amount of hydraulic fluid to be delivered to a work machine is predetermined by a proportional directional control valve.
  • the system pressure is automatically adjusted when a state of balance between the amount of hydraulic fluid flowing into the working machine and that flowing out of the working machine is reached.
  • This automatically adjusting system pressure forms the pressure to open the respective lowering brake valve.
  • This pressure automatically adjusts itself depending on the system and load and this passivity does not allow situational adaptation. It is a kind of "self-oscillating" system, because the pressure builds itself up unaffected.
  • the object of the invention is to avoid the aforementioned disadvantages and to provide a method which allows a better driving a work machine.
  • This object is achieved in that the pressure thus acting at least on the lowering brake valve is adjusted by regulating or controlling to a value which is below the pressure which results at the set power of the working machine.
  • the lowering brake valve is actuated on the control side.
  • an active situational adaptation is possible so that the movement behavior can be influenced at any time depending on the system and the load. Too fast or too wide opening as in the prior art is avoided. Rather, the pressure acting on the lowering brake pressure can be controlled or regulated accurately.
  • the lowering brake valve can be opened slowly or quickly as needed, whereby the pressure can be built up controlled. In that regard, an active influence on the behavior of the lowering brake valve is possible.
  • the generation of the pressure acting on the lowering brake valve can be effected by a control chain or a control chain.
  • a proportional pressure valve For controlling or regulating a proportional pressure valve can be used.
  • the rules can be made on the basis of the measured value of a pressure sensor arranged downstream of the proportional pressure valve, as seen in the flow direction.
  • a pressure sensor arranged downstream of the proportional pressure valve, as seen in the flow direction.
  • other measured values or other configuration of a sensor for control are possible.
  • the invention also relates to a hydraulic system for a working platform, comprising at least one working machine, in particular designed as a hydraulic cylinder work machine, and at least one, in particular designed as a pump, drive machine, each machine by means of two, depending on the operating state of the machine as inlet or return serving , Connections is connected via corresponding working lines with a prime mover, and wherein in at least one working line a lowering brake valve is provided, which via a control line is connected to the other working line such that the lowering brake valve is displaced from its locking position against a restoring force by the pressure prevailing in the other working line and passed through the control line pressure in a flow position.
  • Aerial work platforms are usually movable. For example, they can be mounted on a vehicle or have their own chassis. The vertical projection of the center of gravity can be located on an aerial work platform both inside and outside the tipping edge.
  • Aerial work platforms have a variety of hydraulic cylinders designed as working machines. For example, they serve to extend arms or supports. Also, they are used for extending a lifting arm or a Korbarms.
  • the amount of hydraulic fluid to be delivered to a work machine is predetermined by a proportional directional control valve.
  • the system pressure is automatically adjusted when a state of balance between the amount of hydraulic fluid flowing into the working machine and that flowing out of the working machine is reached.
  • This automatically adjusting system pressure forms the pressure to open the respective lowering brake valve.
  • This pressure automatically adjusts itself depending on the system and load and this passivity does not allow situational adaptation. It is a kind of "self-oscillating" system, because the pressure builds itself up unaffected.
  • the object of the invention is to avoid the aforementioned disadvantages and to provide a hydraulic system that allows a better driving style of a work machine.
  • At least one proportional pressure valve is provided which adjusts the pressure acting on at least the lowering brake valve by regulating or controlling to a value which is below the pressure which results at the set power of the working machine.
  • a proportional pressure valve allows a steady transition between the switching positions, so that a precise operation is possible.
  • Proportional pressure valves are usually electromagnetic or medium-controlled valves, which can assume any intermediate positions between open and closed. They are usually direct-controlled. There are, for example, hydraulically pilot operated or also primarily open or closed proportional pressure valves.
  • the lowering brake valve is actuated on the control side. Due to the regulation or control possibility created by the proportional pressure valve, active situational adaptation is possible, so that the movement behavior can be influenced at any time, depending on the system and load. Too fast or too wide opening, as in the prior art, is avoided. Rather, the pressure acting on the lowering brake pressure can be controlled or regulated accurately. The lowering brake valve can be opened slowly or quickly as needed, whereby the pressure can be built up controlled. In that regard, an active influence on the behavior of the lowering brake valve is possible.
  • At least one proportional pressure valve can be arranged in the working line in the flow direction before the diversion of the control line. In this arrangement, the pressure acting on the lowering brake valve and the pressure acting on the rod side of the working machine are controlled or controlled.
  • At least one proportional pressure valve can be arranged in the control line. Then only the pressure acting on the lowering brake valve is regulated or controlled.
  • At least one working machine a directional control valve, in particular a proportional directional control valve be assigned, wherein the directional control valve or the proportional directional control valve is formed as a switchable connection between the two working lines and two pressure lines, one of the two pressure lines directly or indirectly with the engine and the other the two pressure lines are directly or indirectly connected to a tank, wherein at least one proportional pressure valve is arranged in the outgoing from the engine pressure line.
  • a pressure compensator may be provided between the engine and the proportional pressure valve.
  • FIGS. 1 to 4 show a hydraulic system, each with a working machine 1 and a drive machine 2.
  • Each drive machine 2 is designed as a pump.
  • a hydraulic cylinder As a work machine 1, a hydraulic cylinder is provided.
  • the working machine 1 is by means of two, depending on the operating state of the working machine 1 as an inlet or return serving, connections via appropriate working lines 3 indirectly with the prime mover 2 and a tank 4, is stored in the hydraulic fluid, connected.
  • a lowering brake valve 5 is provided in each working line 3. This is a proportional valve that is held by a spring 7 in its locked position. Via a control line 6, the lowering brake valve 5 is connected to the other working line 3 such that the lowering brake valve 5 are continuously displaced from its locking position against the restoring force of the spring 7 by the prevailing in the other working line 3 and passed through the control line 6 pressure in a flow position can.
  • the working machine 1 is associated with a proportional directional valve 8, which promotes a predetermined volume flow of hydraulic fluid.
  • the proportional directional valve 8 is formed in the illustrated embodiments as a four-three-way valve.
  • the proportional directional control valve 8 can be moved to the three illustrated switching states, wherein four connections are provided in each switching state.
  • the proportional directional control valve 8 is in its central position. In this middle position, the proportional directional control valve 8 is held by two springs 9 acting on the opposite ends. For the displacement of the proportional directional control valve 8, two electrically operating actuators 10 are provided.
  • the proportional directional valve 8 is a switchable connection between the two working lines 3 and two Pressure lines 11 formed, wherein one of the two pressure lines 11 are directly or indirectly connected to the engine 2 and the other of the two pressure lines 11 directly or indirectly connected to the tank 4.
  • a proportional pressure valve 12 which sets the pressure acting on at least the lowering brake valve 5 by regulating or controlling to a value which is below the pressure which results at the set power of the working machine 1.
  • the proportional pressure valve 12 is arranged in the working line 3 in the flow direction before the branch of the control line 6, while in the embodiments according to the 3 and 4 the proportional pressure valve 12 is arranged in the pressure line 11.
  • the pressure acting on the lowering brake valve 5 and on the rail side of the working machines 1 is adjusted by regulating or controlling to a value lower than the pressure resulting at the set power of the working machine 1.
  • the proportional pressure valve 12 is arranged in the control line 6, so that only the pressure acting on the lowering brake valve 5 is adjusted by regulating or controlling to a value which is below the pressure which results at the set power of the working machine 1.
  • a pressure relief valve 13 is also provided, which in the area of the drive machine 2 with the proportional Directional valve 8 connecting pressure line 11 acts. While in the embodiment according to Fig. 3 the pressure limiting valve 13 is arranged in the flow direction before the proportional pressure valve 12, shows Fig. 4 an arrangement of the pressure relief valve 13 in the flow direction behind the proportional pressure valve 12th
  • Hydraulic systems comprising a prime mover 2 and two working machines 1.
  • the hydraulic system of one of the two working machines 1 has the inventive design, which in one of Fig. 1 or 3 is shown. In that regard, the basic structure is identical.
  • hydraulic systems shown partially still have a shuttle valve 14 between the two working lines 3 and a pressure compensator 15, which is arranged in a pressure line 11 of one of the two working machines 1 on.
  • the pressure compensator 15 prevents only the working machine 1 with the lowest required pressure is supplied with hydraulic fluid.
  • a pressure compensator 15 is an essential component in a parallel operation of two working machines 1 by a drive machine 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
EP13177582.7A 2013-07-23 2013-07-23 Procédé de commande d'une machine de travail et système hydraulique pour une plate-forme élévatrice Withdrawn EP2829504A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13177582.7A EP2829504A1 (fr) 2013-07-23 2013-07-23 Procédé de commande d'une machine de travail et système hydraulique pour une plate-forme élévatrice

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13177582.7A EP2829504A1 (fr) 2013-07-23 2013-07-23 Procédé de commande d'une machine de travail et système hydraulique pour une plate-forme élévatrice

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EP2829504A1 true EP2829504A1 (fr) 2015-01-28

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EP13177582.7A Withdrawn EP2829504A1 (fr) 2013-07-23 2013-07-23 Procédé de commande d'une machine de travail et système hydraulique pour une plate-forme élévatrice

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20160056A1 (it) * 2016-01-22 2017-07-22 F Lli Festi Di Festi Roberto & C S N C Sistema per l'abbassamento di emergenza di una piattaforma di lavoro anche nella versione di carro per la raccolta della frutta, per il diradamento, la potatura ed altre operazioni relative al frutteto

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2083164A (en) * 1980-09-08 1982-03-17 Bergens Mek Verksted Hydrostatic brakes
JPH11292496A (ja) * 1998-04-08 1999-10-26 Hitachi Constr Mach Co Ltd 高所作業車の非常降下装置
EP1046610A2 (fr) * 1999-04-20 2000-10-25 BT Industries Aktiebolag Dispositif et procédé pour le mouvement du porte-charge d' un chariot élévateur
DE102006037631A1 (de) * 2006-08-10 2008-02-14 Hydac Fluidtechnik Gmbh Betätigungsvorrichtung
EP1897847A2 (fr) * 2006-09-08 2008-03-12 Deere & Company Appareil de chargement
EP2594523A1 (fr) * 2011-11-16 2013-05-22 Palfinger Platforms GmbH Plateforme élévatrice avec un système hydraulique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2083164A (en) * 1980-09-08 1982-03-17 Bergens Mek Verksted Hydrostatic brakes
JPH11292496A (ja) * 1998-04-08 1999-10-26 Hitachi Constr Mach Co Ltd 高所作業車の非常降下装置
EP1046610A2 (fr) * 1999-04-20 2000-10-25 BT Industries Aktiebolag Dispositif et procédé pour le mouvement du porte-charge d' un chariot élévateur
DE102006037631A1 (de) * 2006-08-10 2008-02-14 Hydac Fluidtechnik Gmbh Betätigungsvorrichtung
EP1897847A2 (fr) * 2006-09-08 2008-03-12 Deere & Company Appareil de chargement
EP2594523A1 (fr) * 2011-11-16 2013-05-22 Palfinger Platforms GmbH Plateforme élévatrice avec un système hydraulique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20160056A1 (it) * 2016-01-22 2017-07-22 F Lli Festi Di Festi Roberto & C S N C Sistema per l'abbassamento di emergenza di una piattaforma di lavoro anche nella versione di carro per la raccolta della frutta, per il diradamento, la potatura ed altre operazioni relative al frutteto

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