EP0057355A2 - Dispositif de levage hydraulique - Google Patents

Dispositif de levage hydraulique Download PDF

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Publication number
EP0057355A2
EP0057355A2 EP82100220A EP82100220A EP0057355A2 EP 0057355 A2 EP0057355 A2 EP 0057355A2 EP 82100220 A EP82100220 A EP 82100220A EP 82100220 A EP82100220 A EP 82100220A EP 0057355 A2 EP0057355 A2 EP 0057355A2
Authority
EP
European Patent Office
Prior art keywords
valve
lowering
lifting
lifting device
throttle valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82100220A
Other languages
German (de)
English (en)
Other versions
EP0057355B1 (fr
EP0057355A3 (en
Inventor
Heinz-Helmut Voigt
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.)
Vickers Systems GmbH
Original Assignee
Vickers Systems GmbH
Sperry Vickers Zweigniederlassung Der Sperry 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 Vickers Systems GmbH, Sperry Vickers Zweigniederlassung Der Sperry GmbH filed Critical Vickers Systems GmbH
Publication of EP0057355A2 publication Critical patent/EP0057355A2/fr
Publication of EP0057355A3 publication Critical patent/EP0057355A3/de
Application granted granted Critical
Publication of EP0057355B1 publication Critical patent/EP0057355B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
    • B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
    • 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

Definitions

  • the invention relates to a hydraulic lifting device containing a pump with flow rate adjustment, a hydraulic motor, lifting and lowering lines and a control device including valves.
  • Hydraulic lifting devices are used in electric forklifts, order picking racking vehicles, lifting platforms, dock levellers, lifts and the like. Like. Used, wherein the lifting speed or the lowering speed is controlled by means of two throttle valves. Each throttle valve contains a control piston with control edges attached to it and an actuating magnet. The two throttle valves can also be combined in one housing with a control piston which can be deflected in two directions. In any case, a separate control edge and a separate control magnet are responsible for lifting and lowering. The position of the control edge has a very large influence on the throttle effect, so that in practice different throttle points have different current-throttle characteristics. It is therefore very difficult to set corresponding lifting speeds and lowering speeds. In practice, this can only be achieved through greater expenditure on control electronics.
  • the invention has for its object to provide a hydraulic lifting device in which a sensitive Lifting and lowering movement is possible, which corresponds very precisely. Furthermore, a load should be kept leak-free and safe even in the event of a power failure.
  • a pump 1 the flow of which can be changed, has a spring-loaded actuating piston 2 and a load sensing valve 3.
  • a delivery line 4 leads via an adjustable throttle valve 5 to a piston-cylinder unit 6.
  • Branch lines 7, 8 are provided in front of and behind the throttle valve 5 (at 41), which lead to the compensation valve 3 or the two sides of the actuating piston 2. If the pressure drop at valve 5 becomes higher than 10 bar when pump 1 is being pumped, the pump is swiveled to a lower flow rate (load compensation).
  • a check valve 10 and 11 are arranged in the flow direction upstream and downstream of the valve 5, which are permeable in the delivery direction and block against the delivery direction.
  • a further control line 12 branches off in front of the check valve 10 and leads into the spring chamber 13 of a shut-off valve 14.
  • the shut-off valve 14 has a space 15 which is connected to the branch line 8, a differential pressure piston 16 and a return line 17 to the tank. If the force exerted on the piston 16 by the pressure in the space 15 is greater than the force of the spring plus the hydraulic force in the spring space, the valve 14 opens otherwise it is closed without leakage.
  • a lej extends beyond the check valve 11 tion piece 20, which is flowed through in one direction or the other depending on the operating state of the lifting device (lifting or lowering a load) of the hydraulic fluid.
  • a lowering line 21, 22 branches off from the line section 20 and opens into the delivery line 4 between the check valve 10 and the throttle valve 5 (at 40).
  • the lowering line 21, 22 is shut off by a controllable shut-off valve 24, which is designed similarly to the shut-off valve 14, the spring chamber 23 of which, however, is connected to the lowering line 21 via a throttle 25 and to the return line 17 via a shut-off drain line 26, 27.
  • An electromagnetically controllable pilot valve 28 connects or blocks the lines 26, 27.
  • a control lever 30 is provided for actuating two electrical circuits, namely a first circuit 31 for switching on a motor relay (in the “lifting a load” operating state) or the pilot valve 28 (in the case of lowering the load) and a second circuit 32 for adjusting the proportional throttle -Valve 5.
  • the second circuit 32 contains a potentiometer 33 or the like, whereby the current can be varied, for example, in the range from 0 to 800 mA.
  • the valve 5 has a magnet 35 and a return spring 36 which act on the spool 37 of the valve. At about 200 mA, the electromagnet 35 has moved the spool so far that the smallest throttle cross section is released. As the current increases, the throttle cross-section also increases and the throttling effect becomes smaller.
  • the circuits 31, 32 are de-energized, as a result of which the motor for driving the pump 1 is switched off and the throttle valve 5 is returned to the closed position. Due to the now missing back pressure, the check valve 11 closes, which is leak-free due to its construction. The same applies to the controllable shut-off valve 24, 28. The same pressure is applied to both sides of the differential pressure piston 24, so that the locking function of the spring predominates and a leak-free shut-off is also achieved.
  • the circuit 31 is used to switch the solenoid valve 28, so that an outgoing choke current occurs via the lines 21, 26, 27, 17, as a result of which the pressure in the spring chamber 23 of the shut-off valve 24 drops because of the throttle 25 and that Valve 24 opens.
  • the main return flow thus reaches the delivery line 4 via the lines 21, 22 and flows through the throttle valve 5 in the same direction as when the load was lifted. It will therefore have the same throttle characteristic achieved. Since the pump 1 is switched off when the load is lowered, the spring chamber 13 of the shut-off valve 14 is depressurized, so that the pressure present in the chamber 15 leads to the opening of the valve and the hydraulic fluid can return to the tank via the line 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP82100220A 1981-02-04 1982-01-14 Dispositif de levage hydraulique Expired EP0057355B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3103745 1981-02-04
DE19813103745 DE3103745A1 (de) 1981-02-04 1981-02-04 Hydraulische hubeinrichtung

Publications (3)

Publication Number Publication Date
EP0057355A2 true EP0057355A2 (fr) 1982-08-11
EP0057355A3 EP0057355A3 (en) 1982-12-15
EP0057355B1 EP0057355B1 (fr) 1985-06-19

Family

ID=6124024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100220A Expired EP0057355B1 (fr) 1981-02-04 1982-01-14 Dispositif de levage hydraulique

Country Status (2)

Country Link
EP (1) EP0057355B1 (fr)
DE (2) DE3103745A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2593796A1 (fr) * 1986-02-04 1987-08-07 Realisa Meca Chaudronneri Et Appareil de manutention verticale de charge
EP0179249A3 (en) * 1984-09-15 1987-09-30 Beringer-Hydraulik Gmbh Hydraulic control
EP0219052A3 (en) * 1985-10-10 1989-10-25 Heilmeier & Weinlein Fabrik Fur Oel-Hydraulik Gmbh & Co. Kg Hydraulic control device
CN1079073C (zh) * 1998-06-08 2002-02-13 液压驱动工业株式会社 高能效液压举升系统的控制方法
EP1635070A1 (fr) 2004-09-08 2006-03-15 HAWE Hydraulik GmbH & Co. KG Dispositif de contrôle électro-hydraulique
CN103089600A (zh) * 2012-11-28 2013-05-08 龙工（上海）桥箱有限公司 一种变量柱塞泵流量控制阀的调试装置
US20140174575A1 (en) * 2012-12-25 2014-06-26 Zhejiang Dunan Hetian Metal Co., Ltd. Wheatstone bridge check valve arrangement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT270131B (de) * 1963-06-10 1969-04-10 Rexroth Gmbh G L Steueranordnung für einen einfachwirkenden Arbeitszylinder, insbesondere an einem Aufzug
SE309834B (fr) * 1965-12-28 1969-04-08 Asea Ab
DE2800814A1 (de) * 1978-01-10 1979-07-12 Bosch Gmbh Robert Hydraulische steuereinrichtung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0179249A3 (en) * 1984-09-15 1987-09-30 Beringer-Hydraulik Gmbh Hydraulic control
EP0219052A3 (en) * 1985-10-10 1989-10-25 Heilmeier & Weinlein Fabrik Fur Oel-Hydraulik Gmbh & Co. Kg Hydraulic control device
FR2593796A1 (fr) * 1986-02-04 1987-08-07 Realisa Meca Chaudronneri Et Appareil de manutention verticale de charge
CN1079073C (zh) * 1998-06-08 2002-02-13 液压驱动工业株式会社 高能效液压举升系统的控制方法
EP1635070A1 (fr) 2004-09-08 2006-03-15 HAWE Hydraulik GmbH & Co. KG Dispositif de contrôle électro-hydraulique
CN103089600A (zh) * 2012-11-28 2013-05-08 龙工（上海）桥箱有限公司 一种变量柱塞泵流量控制阀的调试装置
US20140174575A1 (en) * 2012-12-25 2014-06-26 Zhejiang Dunan Hetian Metal Co., Ltd. Wheatstone bridge check valve arrangement
US9328832B2 (en) * 2012-12-25 2016-05-03 Zhejiang Dunan Hetian Metal Co., Ltd. Wheatstone bridge check valve arrangement

Also Published As

Publication number Publication date
DE3103745A1 (de) 1982-09-02
EP0057355B1 (fr) 1985-06-19
EP0057355A3 (en) 1982-12-15
DE3264150D1 (en) 1985-07-25

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