EP0057355B1 - Dispositif de levage hydraulique - Google Patents

Dispositif de levage hydraulique Download PDF

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Publication number
EP0057355B1
EP0057355B1 EP82100220A EP82100220A EP0057355B1 EP 0057355 B1 EP0057355 B1 EP 0057355B1 EP 82100220 A EP82100220 A EP 82100220A EP 82100220 A EP82100220 A EP 82100220A EP 0057355 B1 EP0057355 B1 EP 0057355B1
Authority
EP
European Patent Office
Prior art keywords
valve
lifting
shut
flow
lowering
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
Application number
EP82100220A
Other languages
German (de)
English (en)
Other versions
EP0057355A3 (en
EP0057355A2 (fr
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
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 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.
  • a known hydraulic lifting device of this type (DE-A-2800814) at least one directional control valve with two throttling points is provided, through which the hydraulic flow runs when lifting or lowering.
  • a pressure compensator arranged in the return line to the tank is intended to ensure a constant pressure drop at the throttle point set in each case.
  • the choke effect of a choke normally depends on the position of a control edge, and in practice the different positions of the control edge have different current choke characteristics. It is therefore very difficult to set matching speeds and lowering speeds.
  • Another disadvantage is that in any case there must be a hydraulic flow flowing back to the tank in order to actuate the connected pressure compensator. It is therefore not possible to work with a plunger cylinder or plunger cylinder, because in the event of a load being lifted, no oil leaves the tank.
  • a double-acting cylinder is also assumed, i. H. such a plunger type would be unsuitable. While one piston chamber is constantly connected to the outlet of a constant pump, the other piston chamber is alternately connected to the tank or also to the pump outlet via a throttle. For this purpose, a control valve is used, which ensures that the throttle is always flowed through in the same direction. Disadvantages include being tied to a double-acting piston cylinder, the difficulty in keeping a load leak-free and the high energy losses during part-load operation.
  • Hydraulic lifting devices using a plunger cylinder are known per se (AT-B-270 131).
  • the hydraulic flow of a constant pump is passed through an adjustable throttle for lifting in one direction and for lowering in the opposite direction.
  • Two independent pressure compensators are used for lifting and lowering.
  • the hydraulic circuit can only be used sensibly for a constant pump, so that high energy losses occur in partial operation in any case.
  • the invention has for its object to provide a hydraulic lifting device in which a sensitive lifting and lowering movement is possible, which match very precisely, furthermore a load should be kept leak-free and safe even in the event of a power failure, and good efficiency should be achieved in part-load operation can be.
  • 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, 8 'and a control line 9 are provided in front of and behind the throttle valve 5, which lead to the compensation valve 3 or the two sides of the control piston 2.
  • the branch line 8 leads out of the delivery line 4 at the point 41. 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 or 11 is 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, then the shut-off valve 14 opens, otherwise it is closed without leakage.
  • 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 the point 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 electromagnetic 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 -Vehtils 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 becomes larger and the throttling effect smaller.
  • the control lever 30 is actuated and thus the circuit 31 is switched on, as a result of which the electric motor of the pump 1 is started and the pump 1 begins to press the hydraulic fluid into the delivery line 4.
  • the throttle valve 5 is opened proportionally accordingly, and a corresponding proportional hydraulic current flows to the hydraulic motor 6.
  • the Delivery flow of the pump 1 is always regulated so that in the line section of the delivery line 4 near the pump there is a 10 bar higher pressure than in the line section 20.
  • the shut-off valves 14 and 24 are blocked because in their spring chambers 13 and 23 the full one There is pressure.
  • 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 circuit 31 is used to switch the pilot valve 28, so that an outgoing throttle current is produced 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 common line section between the points 40, 41 and the throttle valve 5 in the same direction as when the load was lifted.
  • the same throttle characteristic is thus 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)

Claims (4)

1. Dispositif de levage hydraulique comprenant une pompe (1) munie d'un dispositif (2) de réglage du débit de refoulement, un moteur hydraulique (vérin à piston 6 ou équivalent), des conduites de levage et de descente (4, 20, 21, 22, 8, 17), ainsi qu'un dispositif de commande (30 à 33) comprenant des valves ou distributeurs (5, 14, 24,28), caractérisé en ce que:
a) les conduites de levage et des descente (4, 20, 21, 22, 8, 17) comprennent un tronçon commun (entre les points 40 et 41) qui est parcouru par un écoulement ayant toujours le même sens, et dans lequel est intercalé un distributeur (5) à étranglement réglable;
b) la conduite de descente (20, 21, 22) est reliée au tronçon commun, en amont, dans le sens de l'écoulement, du distributeur (5) à étranglement réglable, et comporte une valve d'arrêt (24);
c) une conduite de retour (8, 17) est dérivée du tronçon de conduite commun, en aval du distributeur (5) à étranglement réglable, et comporte une deuxième valve d'arrêt (14).
2. Dispositif de levage selon la revendication 1, caractérisé en ce qu'il comprend un levier de commande (30) destiné à commander deux circuits électriques (31, 32), à savoir, un premier circuit (31) destiné à alimenter un relais de moteur ou une valve pilote électromagnétique (28) commandant la valve d'arrêt (24), et un deuxième circuit (32) servant au réglage du distributeur (5) à étranglement réglable.
3. Dispositif de levage selon l'une des revendications 1 et 2, caractérisé en ce que la valve d'arrêt (24) comporte un piston à pression différentielle avec ressort et chambre de ressort (23), et en ce que la valve pilote (28) peut, soit isoler la chambre (23) du ressort, soit la mettre en communication avec une conduite de retour (27, 17) non soumise à la pression.
4. Dispositif de levage selon l'une des revendications 1 à 3, caractérisé en ce que le tronçon de conduite commun (entre les points 40 et 41) est protégé par des clapets anti-retour (10,11).
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 EP0057355A2 (fr) 1982-08-11
EP0057355A3 EP0057355A3 (en) 1982-12-15
EP0057355B1 true 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)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3434014A1 (de) * 1984-09-15 1986-03-20 Beringer-Hydraulik GmbH, Neuheim, Zug Hydraulische steuerung
DE3536219A1 (de) * 1985-10-10 1987-04-16 Heilmeier & Weinlein Hydraulische steuervorrichtung
FR2593796A1 (fr) * 1986-02-04 1987-08-07 Realisa Meca Chaudronneri Et Appareil de manutention verticale de charge
JPH11349288A (ja) * 1998-06-08 1999-12-21 Oil Drive Kogyo Kk 省エネルギ型油圧昇降装置の制御方法
DE202004014029U1 (de) 2004-09-08 2006-01-12 Hawe Hydraulik Gmbh & Co. Kg Elektrohydraulische Steuervorrichtung
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
US9328832B2 (en) * 2012-12-25 2016-05-03 Zhejiang Dunan Hetian Metal Co., Ltd. Wheatstone bridge check valve arrangement

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1456340A1 (de) * 1965-12-28 1968-12-05 Asea Ab Ventilsystem fuer einen hydraulischen Aufzug

Family Cites Families (2)

* 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
DE2800814A1 (de) * 1978-01-10 1979-07-12 Bosch Gmbh Robert Hydraulische steuereinrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1456340A1 (de) * 1965-12-28 1968-12-05 Asea Ab Ventilsystem fuer einen hydraulischen Aufzug

Also Published As

Publication number Publication date
DE3103745A1 (de) 1982-09-02
EP0057355A3 (en) 1982-12-15
DE3264150D1 (en) 1985-07-25
EP0057355A2 (fr) 1982-08-11

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