EP0055247A2 - Loading crane - Google Patents

Loading crane Download PDF

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Publication number
EP0055247A2
EP0055247A2 EP81890209A EP81890209A EP0055247A2 EP 0055247 A2 EP0055247 A2 EP 0055247A2 EP 81890209 A EP81890209 A EP 81890209A EP 81890209 A EP81890209 A EP 81890209A EP 0055247 A2 EP0055247 A2 EP 0055247A2
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EP
European Patent Office
Prior art keywords
hydraulic drive
swivel arm
valve
overload
lowering
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Granted
Application number
EP81890209A
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German (de)
French (fr)
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EP0055247A3 (en
EP0055247B1 (en
Inventor
Georg Popodi
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Palfinger AG
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Palfinger AG
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Publication of EP0055247A2 publication Critical patent/EP0055247A2/en
Publication of EP0055247A3 publication Critical patent/EP0055247A3/en
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Publication of EP0055247B1 publication Critical patent/EP0055247B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure

Definitions

  • the invention relates to a loading crane with a swivel arm which can be raised and lowered by means of a first hydraulic drive and which optionally comprises a plurality of swivel arm parts which can be moved relative to one another by means of further hydraulic drives, a load holding valve being connected upstream of the cylinder space of the first hydraulic drive associated with a lifting movement of the swivel arm which can be controlled into the open position by an increase in pressure in the line connected to the cylinder chamber associated with a lowering movement, and with which an overload valve communicates with the first hydraulic drive, which responds in the event of a crane overload and one or more of the hydraulic drives against a torque increasing the load torque Movement blocks.
  • a loading crane with an overload protection device which is primarily intended for mounting on trucks, is described for example in DE-PS 21 54 631.
  • This loading crane consists of a two-part swivel arm and a telescopic extension arm, whereby all these arms can be moved against each other by means of double-acting hydraulic drives. The movement of the hydraulic drives is initiated by means of control valves.
  • an overload valve communicates with the hydraulic drive that controls the lifting and lowering movement of the swivel arm. This overload valve responds in the event of a crane overload and shifts the control valves into a neutral position or prevents the control valves from being actuated in the direction in which the load torque increases.
  • a major disadvantage with such a loading crane is that no load holding valve can be used.
  • Such a load holding valve is connected upstream of the cylinder space of the corresponding hydraulic drive assigned to a lifting movement of the swivel arm, and is controlled into the open position by pressure increase in the line connected to the cylinder movement assigned to a lowering movement.
  • Advantages of load holding Tiles are, among other things, an absolutely safe hanging of the load and the omission of an otherwise necessary hose rupture valve, which would only mean partial securing of the loading crane.
  • the invention was accordingly based on the object of preventing the overloading of a loading crane of the type mentioned at the outset even when the swivel arm or main arm was lowered.
  • the overload valve blocks at least the first hydraulic drive against a lowering movement of the swivel arm in the event of a crane overload, and that the pressure increase required for a lowering movement of the swivel arm in the corresponding line connected to the first, hydraulic drive in or before the overload valve is compensated.
  • the switching threshold of the overload valve is maintained or is prevented that this pressure increase is superimposed on the pressure resulting from the load moment. This reliably prevents the load crane from tipping over or being overloaded even when the swivel arm is lowered.
  • FIG. 1 shows the diagram of a loading crane according to the invention with compensation for the pressure increase in the overload valve required for the lowering movement of the swivel arm
  • FIG. 2 shows the compensation by means of a compensation valve upstream of the overload valve
  • FIG. 3 shows the use of a pressure reducing valve for this purpose.
  • the swivel arm 2 is shown of the well-known loading crane 1, which can be raised or lowered by means of a hydraulic drive 3 consisting of a cylinder and piston with a piston rod. It is easy to see that the load torque is reduced or increased by this lifting or lowering movement.
  • the cylinder space 3 ′′ of the hydraulic drive 3 assigned to the lowering movement is connected to a control valve 4 via a lowering line 7.
  • a known load-holding valve 12 is connected upstream of the cylinder space 3 ′ assigned to a lifting movement of the swivel arm 2 and is likewise connected to the control valve 4 via a line 6
  • the cylinder chamber 3 communicates with an overload valve 11 via a line 8.
  • This overload valve is biased into the closed position by means of a spring and has a first control piston which counteracts the spring force and communicates with the line 8 via a line 10.
  • a second control piston whose direction of action is opposite to the first control piston, communicates with the lowering line 7 via a line 13.
  • the overload valve 11 responds in a known manner, ie it connects the line 8 to the line 16 and thus actuates a locking drive 5.
  • This locking drive 5 moves all the control valves 4 into a neutral position, which hydraulic drives are assigned, which can cause a movement that increases the load moment.
  • the locking drive 5 can either be integrated in a known manner in the control valves, but it can also act directly on the hand lever for actuating the control valves.
  • the overload valve 11 blocks the control valve 4 via the blocking drive 5 in the manner previously described.
  • the overload valve 11 is preceded by a pressure compensation valve 14, which in turn has two counteracting control pistons and is resiliently biased into the closed position.
  • the first control piston communicates with the cylinder space 3 ′ of the drive 3 via a line 10
  • the second control piston communicates with the lowering line 7 via a line 13.
  • FIG. 3 Another possibility of pressure compensation when lowering the swivel arm 2 is shown in FIG. 3.
  • a pressure reducing valve 15 is switched into the lowering line 7 between the connection for the control line 9 of the load holding valve 12 and the hydraulic drive 3.
  • This pressure reducing valve 15 prevents the overpressure required for opening the load holding valve from propagating in the lower line 7 into the cylinder space 3 ′′ and thus superimposed on the pressure resulting from the load moment.

Abstract

1. Loading crane with a swivel arm liftable and lowerable by means of a first hydraulic drive and comprising, if required, a number of further swivel arm elements movable towards one another by means of further hydraulic drives, ahead of the cylinder space (3') of the first hydraulic drive (3) which is associated with an upward motion of the swivel arm (2), a load holding valve (12) being arranged and movable into the open position by pressure increase in the conduit (7) connected with the cylinder space associated with a lowering motion, and an overload valve (11) communicating with the first hydraulic drive and blocking at least the first hydraulic drive against a motion increasing the load moment, when the crane is overloaded, characterized by a spring-loaded compensating valve with two oppositely acting control pistons, the first of said pistons - as known per se - counteracting the spring force and communicating via a first conduit (10) with a cylinder space (3') of the first hydraulic drive (3) associated with a lifting motion of the swivel arm (2), and the second of said pistons, whose direction of action is opposed to the first control piston, being connected with the lowering conduit (7) of the first hydraulic drive (3) via a second conduit (13).

Description

Die Erfindung betrifft einen Ladekran mit einem mittels eines ersten, hydraulischen Antriebs heb- und senkbaren Schwenkarm, der gegebenenfalls aus mehreren, mittels weiteren, hydraulischen Antrieben gegeneinander bewegbaren Schwenkarmteilen besteht, wobei dem einer Hebbewegung des Schwenkarmes zugeordneten Zylinderraum des ersten, hydraulischen Antriebs ein Lasthalteventil vorgeschaltet ist, welches durch Druckanstieg in der mit dem einer Senkbewegung zugeordneten Zylinderraum verbundenen Leitung in die Offenstellung steuerbar ist, und wobei mit dem ersten, hydraulischen Antrieb ein Uberlastventil kommuniziert, welches bei einer Kranüberlastung anspricht und einen oder mehrere der hydraulischen Antriebe gegen eine das Lastmoment vergrößernde Bewegung sperrt.The invention relates to a loading crane with a swivel arm which can be raised and lowered by means of a first hydraulic drive and which optionally comprises a plurality of swivel arm parts which can be moved relative to one another by means of further hydraulic drives, a load holding valve being connected upstream of the cylinder space of the first hydraulic drive associated with a lifting movement of the swivel arm which can be controlled into the open position by an increase in pressure in the line connected to the cylinder chamber associated with a lowering movement, and with which an overload valve communicates with the first hydraulic drive, which responds in the event of a crane overload and one or more of the hydraulic drives against a torque increasing the load torque Movement blocks.

Ein Ladekran mit einer Uberlastschutzvorrichtung, welcher vorwiegend für den Aufbau auf Lastkraftfahrzeugen vorgesehen ist, ist beispielsweise in der DE-PS 21 54 631 beschrieben. Dieser Ladekran besteht aus einem zweiteiligen Schwenkarm, und einem teleskopisch ausgebildeten Verlängerungsarm, wobei alle diese Arme mittels doppeltwirkenden, hydraulischen Antrieben gegeneinander bewegt werden können. Die Bewegung der hydraulischen Antriebe wird mittels Steuerventilen eingeleitet. Um eine überlastung und damit ein Kippen des Lastkraftfahrzeuges zu verhindern, kommuniziert mit dem die Heb- bzw. Senkbewegung des Schwenkarmes steuernden hydraulischen Antrieb ein überlastventil. Dieses Uberlastventil spricht bei einer Kranüberlastung an und verschiebt die Steuerventile in eine neutrale Stellung bzw. verhindert ein Betätigen der Steuerventile in jener Richtung, in der das Lastmoment zunimmt.A loading crane with an overload protection device, which is primarily intended for mounting on trucks, is described for example in DE-PS 21 54 631. This loading crane consists of a two-part swivel arm and a telescopic extension arm, whereby all these arms can be moved against each other by means of double-acting hydraulic drives. The movement of the hydraulic drives is initiated by means of control valves. In order to prevent an overload and thus a tipping of the truck, an overload valve communicates with the hydraulic drive that controls the lifting and lowering movement of the swivel arm. This overload valve responds in the event of a crane overload and shifts the control valves into a neutral position or prevents the control valves from being actuated in the direction in which the load torque increases.

Ein wesentlicher Nachteil bei einem solchen Ladekran besteht darin, daß kein Lasthalteventil verwendet werden kann. Ein solches Lasthalteventil ist dem einer Hebbewegung des Schwenkarmes zugeordneten Zylinderraum des entsprechenden hydraulischen Antriebs vorgeschaltet, und wird durch Druckanstieg in der mit dem einer Senkbewegung zugeordneten Zylinderraum verbundenen Leitung in die Offenstellung gesteuert. Vorteile eines Lasthalteventiles sind unter anderem ein absolut sicheres Hängen der Last und der Wegfall eines ansonsten notwendigen Schlauchbruchventils, welches nur eine teilweise Sicherung des Ladekrans bedeuten würde.A major disadvantage with such a loading crane is that no load holding valve can be used. Such a load holding valve is connected upstream of the cylinder space of the corresponding hydraulic drive assigned to a lifting movement of the swivel arm, and is controlled into the open position by pressure increase in the line connected to the cylinder movement assigned to a lowering movement. Advantages of load holding Tiles are, among other things, an absolutely safe hanging of the load and the omission of an otherwise necessary hose rupture valve, which would only mean partial securing of the loading crane.

Der Grund, waran man ein Lasthalteventil in Verbindung mit der Uberlastschutzvorrichtung nicht verwenden kann, liegt darin, daß beim Absenken des Schwenkarmes in der Senkleitung ein Überdruck aufgebaut werden muß, welcher sich dem durch das Lastmoment bedingten Druck in dem hydraulischen Antrieb überlagert. Dadurch würde die Ansprechschwelle des überlastventils überschritten und dieses seinerseits die Absenkbewegung sperren, ohne daß eine tatsächliche Kranüberlastung gegeben ist.The reason why a load holding valve cannot be used in connection with the overload protection device is that when the swivel arm is lowered in the lower line, an overpressure must be built up which is superimposed on the pressure in the hydraulic drive caused by the load moment. This would exceed the response threshold of the overload valve and in turn block the lowering movement without an actual crane overload.

Man hat deshalb bislang den die Heb- bzw. Senkbewegung des Schwenkarmes bewirkenden hydraulischen Antrieb nicht in die überlastschutzvorrichtung einbezogen.Therefore, the hydraulic drive causing the lifting or lowering movement of the swivel arm has not been included in the overload protection device.

Der Erfindung lag demgemäß die Aufgabe zugrunde, die Überlastung eines Ladekranes der eingangs genannten Gattung auch bei Absenken des Schwenkarmes bzw. Hauptarmes zu verhindern.The invention was accordingly based on the object of preventing the overloading of a loading crane of the type mentioned at the outset even when the swivel arm or main arm was lowered.

Erfindungsgemäß wird hiezu vorgesehen, daß das Überlastventil bei einer Kranüberlastung zumindest den ersten, hydraulischen Antrieb gegen eine Senkbewegung des Schwenkarmes sperrt, und daß der für eine Senkbewegung des Schwenkarmes erforderliche Druckanstieg in der entsprechenden, mit dem ersten, hydraulischen Antrieb verbundenen Leitung im oder vor dem überlastventil kompensiert wird. Durch die Kompensation des für eine Senkbewegung des Schwenkarmes erforderlichen Druckanstiegs in der Senkleitung bleibt die Schaltschwelle des überlastventils erhalten bzw. wird verhindert, daß sich dieser Druckanstieg dem vom Lastmoment herrührenden Druck überlagert. Somit ist ein Kippen bzw. Überladen des Lastkranes auch bei einem Absenken des Schwenkarmes mit Sicherheit verhindert.According to the invention, the overload valve blocks at least the first hydraulic drive against a lowering movement of the swivel arm in the event of a crane overload, and that the pressure increase required for a lowering movement of the swivel arm in the corresponding line connected to the first, hydraulic drive in or before the overload valve is compensated. By compensating for the pressure increase in the lowering line required for a lowering movement of the swivel arm, the switching threshold of the overload valve is maintained or is prevented that this pressure increase is superimposed on the pressure resulting from the load moment. This reliably prevents the load crane from tipping over or being overloaded even when the swivel arm is lowered.

Weitere Einzelheiten der Erfindung werden nachfolgend an Hand einer Reihe von Ausführungsbeispielen und unter Bezugnahme auf die Zeichnungsfiguren näher erläutert.Further details of the invention are explained in more detail below using a number of exemplary embodiments and with reference to the drawing figures.

Hiebei zeigen die Fig. 1 das Schema eines erfindungsgemäßen Ladekrans mit einer Kompensation des für die Senkbewegung des Schwenkarmes erforderlichen Druckanstiegs im überlastventil, die Fig. 2 die Kompensation durch ein dem überlastventil vorgeschaltetes Kompensationsventil und die Fig. 3 die Verwendung eines Druckreduzierventils für diesen Zweck.1 shows the diagram of a loading crane according to the invention with compensation for the pressure increase in the overload valve required for the lowering movement of the swivel arm, FIG. 2 shows the compensation by means of a compensation valve upstream of the overload valve, and FIG. 3 shows the use of a pressure reducing valve for this purpose.

Bei dem in der Fig. 1 dargestellten Ausführungsbeispiel ist von dem hinreichend bekannten Ladekran 1 nur der Schwenkarm 2 dargestellt, welcher mittels eines aus Zylinder und Kolben mit Kolbenstange bestehenden hydraulischen Antriebs 3 angehoben bzw. abgesenkt werden kann. Es ist leicht ersichtlich, daß durch diese Heb- bzw. Senkbewegung das Lastmoment verkleinert bzw. vergrößert wird. Der der Senkbewegung zugeordnete Zylinderraum 3" des hydraulischen Antriebs 3 ist über eine Senkleitung 7 mit einem Steuerventil 4 verbunden. Dem einer Hebbewegung des Schwenkarmes 2 zugeordneten Zylinderraum 3' ist ein bekanntes Lasthalteventil 12 vorgeschaltet, welches ebenfalls über eine Leitung 6 mit dem Steuerventil 4 verbunden ist. Weiters kommuniziert der Zylinderraum 3' über eine Leitung 8 mit einem Überlastventil 11. Dieses Überlastventil ist in die Geschlossenstellung mittels einer Feder vorgespannt, und weist einen ersten, der Federkraft entgegenwirkenden Steuerkolben auf, welcher über eine Leitung 10 mit der Leitung 8 kommuniziert. Ein zweiter Steuerkolben, dessen Wirkungsrichtung dem ersten Steuerkolben entgegengesetzt ist, kommuniziert über eine Leitung 13 mit der Senkleitung 7.In the exemplary embodiment shown in FIG. 1, only the swivel arm 2 is shown of the well-known loading crane 1, which can be raised or lowered by means of a hydraulic drive 3 consisting of a cylinder and piston with a piston rod. It is easy to see that the load torque is reduced or increased by this lifting or lowering movement. The cylinder space 3 ″ of the hydraulic drive 3 assigned to the lowering movement is connected to a control valve 4 via a lowering line 7. A known load-holding valve 12 is connected upstream of the cylinder space 3 ′ assigned to a lifting movement of the swivel arm 2 and is likewise connected to the control valve 4 via a line 6 Furthermore, the cylinder chamber 3 'communicates with an overload valve 11 via a line 8. This overload valve is biased into the closed position by means of a spring and has a first control piston which counteracts the spring force and communicates with the line 8 via a line 10. A second control piston, whose direction of action is opposite to the first control piston, communicates with the lowering line 7 via a line 13.

Wird nun der Ladekran beispielsweise durch ein zu weites Ausfahren eines nicht dargestelltenverlängerungsarmes überlastet, so spricht das Überlastventil 11 in bekannter Weise an, d. h. es verbindet die Leitung 8 mit der Leitung 16 und betätigt so einen Sperrantrieb 5. Dieser Sperrantrieb 5 verschiebt alle Steuerventile 4 in eine neutrale Stellung, welche hydraulischen Antrieben zugeordnet sind, die eine das Lastmoment vergrößernde Bewegung bewirken können. Der Sperrantrieb 5 kann entweder in bekannter Weise in die Steuerventile integriert sein, er kann aber auch direkt auf die Handhebel zur Betätigung der Steuerventile wirken.If the loading crane is now overloaded, for example by an extension arm (not shown) being extended too far, the overload valve 11 responds in a known manner, ie it connects the line 8 to the line 16 and thus actuates a locking drive 5. This locking drive 5 moves all the control valves 4 into a neutral position, which hydraulic drives are assigned, which can cause a movement that increases the load moment. The locking drive 5 can either be integrated in a known manner in the control valves, but it can also act directly on the hand lever for actuating the control valves.

Bei dem Schwenken des Schwenkarmes mittels des hydraulischen Antriebes 3 muß aufgrund des Lasthalteventils 12 in bekannter Weise in der Senkleitung 7 ein Überdruck aufgebaut werden, sodaß das Lasthalteventil 12 über die Leitung 9 in die Offenstellung gesteuert werden kann. Dieser Überdruck in der Leitung 7 und dem Zylinderraum 3" pflanzt sich auch in den Zylinderraum 3' fort und überlagert sich dort dem vom Lastmoment herrührenden Druck. Zugleich wird jedoch dieser Druckanstieg im Uberlastventil 11 dadurch kompensiert, daß dem ersten, über die Leitung 10 mit dem Zylinderraum 3' kommunizierenden Steuerkolben ein zweiter Steuerkolben entgegenwirkt, der über die Leitung 13 mit der Senkleitung 7 kommuniziert. Damit bleibt die Schaltschwelle des überlastventils konstant.When pivoting the swivel arm by means of the hydraulic drive 3, an excess pressure must be built up in the lowering line 7 in a known manner due to the load holding valve 12, so that the load holding valve 12 can be controlled via the line 9 into the open position. This overpressure in the line 7 and the cylinder space 3 "also propagates into the cylinder space 3 'and is superimposed there on the pressure resulting from the load moment counteracts the control piston communicating with the cylinder space 3 ', a second control piston communicating with the lowering line 7 via the line 13. The switching threshold of the overload valve thus remains constant.

Tritt jedoch während des Absenkens des Schwenkarmes 2 eine tatsächliche Überlastung ein, so blockiert das Uberlastventil 11 über den Sperrantrieb 5 in der vorher beschriebenen Weise das Steuerventil 4.However, if an actual overload occurs during the lowering of the swivel arm 2, the overload valve 11 blocks the control valve 4 via the blocking drive 5 in the manner previously described.

Bei der in der Fig. 2 dargestellten Variante ist dem Überlastventil 11 ein Druckkompensationsventil 14 vorgeschaltet, welches wiederum zwei entgegenwirkende Steuerkolben aufweist und federnd in die Geschlossenstellung vorgespannt ist. Auch hier kommuniziert der erste Steuerkolben über eine Leitung 10 mit dem Zylinderraum 3' des Antriebs 3, während der zweite Steuerkolben über eine Leitung 13 mit der Senkleitung 7 kommuniziert.In the variant shown in FIG. 2, the overload valve 11 is preceded by a pressure compensation valve 14, which in turn has two counteracting control pistons and is resiliently biased into the closed position. Here too, the first control piston communicates with the cylinder space 3 ′ of the drive 3 via a line 10, while the second control piston communicates with the lowering line 7 via a line 13.

Eine weitere Möglichkeit der Druckkompensation beim Absenken des Schwenkarmes 2 ist in der Fig. 3 dargestellt. Hier ist zwischen dem Anschluß für die Steuerleitung 9 des Lasthalteventils 12 und dem hydraulischen Antrieb 3 ein Druckreduzierventil 15 in die Senkleitung 7 eingeschaltet. Dieses Druckreduzierventil 15 verhindert, daß sich der für die Aufsteuerung des Lasthalteventils erforderliche überdruck in der Senkleitung 7 bis in den Zylinderraum 3" fortpflanzt und somit dem vom Lastmoment herrührenden Druck überlagert.Another possibility of pressure compensation when lowering the swivel arm 2 is shown in FIG. 3. Here, a pressure reducing valve 15 is switched into the lowering line 7 between the connection for the control line 9 of the load holding valve 12 and the hydraulic drive 3. This pressure reducing valve 15 prevents the overpressure required for opening the load holding valve from propagating in the lower line 7 into the cylinder space 3 ″ and thus superimposed on the pressure resulting from the load moment.

Claims (4)

1. Ladekran mit einem mittels eines ersten, hydraulischen Antriebs heb- und senkbaren Schwenkarm, der gegebenenfalls aus mehreren, mittels weiteren, hydraulischen Antrieben gegen-einander bewegbaren Schwenkarmteilen besteht, wobei dem einer Hebbewegung des Schwenkarmes zugeordneten Zylinderraum des ersten, hydraulischen Antriebs ein Lasthalteventil vorgeschaltet ist, welches durch Druckanstieg in der mit dem einer Senkbewegung zugeordneten Zylinderraum verbundenen Leitung in die Offenstellung steuerbar ist, und wobei mit dem ersten, hydraulischen Antrieb ein überlastventil kommuniziert, welches bei einer Kranüberlastung anspricht und einen oder mehrere der hydraulischen Antriebe gegen eine das Lastmoment vergrößernde Bewegung sperrt, dadurch gekennzeichnet, daß das Uberlastventil (11) bei einer Kranüberlastung zumindest den ersten, hydraulischen Antrieb (3) gegen eine Senkbewegung des Schwenkarmes (2) sperrt, und daß der für eine Senkbewegung des Schwenkarmes (2) erforderliche Druckanstieg in der entsprechenden, mit dem ersten, hydraulischen Antrieb (3) verbundenen Leitung (7) im oder vor dem Uberlastventil (11) kompensiert wird.1. Loading crane with a swivel arm that can be raised and lowered by means of a first hydraulic drive, which optionally consists of a plurality of swivel arm parts that can be moved relative to one another by means of further hydraulic drives, a load holding valve being connected upstream of the cylinder space of the first hydraulic drive associated with a lifting movement of the swivel arm which can be controlled into the open position by an increase in pressure in the line connected to the cylinder chamber associated with a lowering movement, and wherein an overload valve communicates with the first hydraulic drive, which responds in the event of a crane overload, and one or more of the hydraulic drives against a torque increasing the load torque Movement blocks, characterized in that the overload valve (11) blocks at least the first hydraulic drive (3) against a lowering movement of the swivel arm (2) in the event of a crane overload, and in that the pressure element required for a lowering movement of the swivel arm (2) Tieg is compensated in the corresponding line (7) connected to the first hydraulic drive (3) in or before the overload valve (11). 2. Ladekran nach Anspruch 1, dadurch gekennzeichnet, daß das Überlastventil (11), dessen erster Steuerkolben wie an .sich bekannt mit dem einer Hebbewegung des Schwenkarmes (2) zugeordneten Zylinderarm (3') des ersten, hydraulischen Antriebs (3) kommuniziert, einen zweiten Steuerkolben aufweist, dessen Wirkungsrichtung dem ersten Steuerkolben entgegengesetzt ist und mit der Senkleitung (7) für den ersten, hydraulischen Antrieb (3) kommuniziert.2. Loading crane according to claim 1, characterized in that the overload valve (11), the first control piston as known to .sich communicates with the lifting arm of the swivel arm (2) associated cylinder arm (3 ') of the first hydraulic drive (3), has a second control piston, the direction of action of which is opposite to the first control piston and communicates with the lowering line (7) for the first hydraulic drive (3). 3.. Ladekran nach Anspruch 1, dadurch gekennzeichnet, daß dem Überlastventil (11) ein Kompensationsventil (14) mit zwei entgegengesetzt wirkenden Steuerkolben vorgeschaltet ist, wobei der erste Steuerkolben mit dem einer Hebbewegung des Schwenkarmes (2) zugeordneten Zylinderraum (3') des ersten, hydraulischen Antriebs (1) und der zweite Steuerkolben mit der Senkleitung (7) kommuniziert.3 .. Loading crane according to claim 1, characterized in that the overload valve (11) is preceded by a compensation valve (14) with two oppositely acting control pistons, the first control piston having the cylinder space (3 ') associated with a lifting movement of the swivel arm (2) communicates the first hydraulic drive (1) and the second control piston with the lowering line (7). 4. Ladekran nach Anspruch 1, dadurch gekennzeichnet, daß dem einer Senkbewegung des Schwenkarmes (2) zugeordneten Zylinderraum (3") des ersten, hydraulischen Antriebs (1) ein Druckreduzierventil (6) vorgeschaltet ist.4. Loading crane according to claim 1, characterized in that a lowering movement of the swivel arm (2) associated cylinder space (3 ") of the first hydraulic drive (1) is preceded by a pressure reducing valve (6).
EP81890209A 1980-12-23 1981-12-23 Loading crane Expired EP0055247B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6280/80 1980-12-23
AT0628080A AT368107B (en) 1980-12-23 1980-12-23 LOADING CRANE

Publications (3)

Publication Number Publication Date
EP0055247A2 true EP0055247A2 (en) 1982-06-30
EP0055247A3 EP0055247A3 (en) 1984-07-25
EP0055247B1 EP0055247B1 (en) 1986-09-03

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ID=3584717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890209A Expired EP0055247B1 (en) 1980-12-23 1981-12-23 Loading crane

Country Status (3)

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EP (1) EP0055247B1 (en)
AT (1) AT368107B (en)
DE (1) DE3175278D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158740A2 (en) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Hydraulic overload protection device for a lifting apparatus
EP0158738A2 (en) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Hydraulic overload protection device for a loading crane
CN106185633A (en) * 2016-08-24 2016-12-07 三汽车起重机械有限公司 Balancing valve apparatus, crane and elevating mechanism

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2154631A1 (en) * 1970-11-04 1972-05-10 Hiab-Foco Ab, Hudiksvall (Schweden) Locking device on hydraulically operated loading cranes
US3814265A (en) * 1973-08-20 1974-06-04 Harnischfeger Corp Hydraulic crane control system having means for deactivating control valves when operating limit is exceeded
US3841493A (en) * 1972-06-05 1974-10-15 J Becker Moment monitoring system for hydraulic-piston type cranes
FR2483904A1 (en) * 1980-06-04 1981-12-11 Hiab Foco Ab LOAD LIMITING DEVICE FOR HYDRAULICALLY CONTROLLED CRANES

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2154631A1 (en) * 1970-11-04 1972-05-10 Hiab-Foco Ab, Hudiksvall (Schweden) Locking device on hydraulically operated loading cranes
US3841493A (en) * 1972-06-05 1974-10-15 J Becker Moment monitoring system for hydraulic-piston type cranes
US3814265A (en) * 1973-08-20 1974-06-04 Harnischfeger Corp Hydraulic crane control system having means for deactivating control valves when operating limit is exceeded
FR2483904A1 (en) * 1980-06-04 1981-12-11 Hiab Foco Ab LOAD LIMITING DEVICE FOR HYDRAULICALLY CONTROLLED CRANES

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ÖLHYDRAULIK UND PNEUMATIC, Band 21, Nr. 6, Juni 1977, Mainz (DE) *
ÖLHYDRAULIK UND PNEUMATIC, Band 21, Nr. 6, Juni 1977, Mainz (DE) G. BEITLER: "Steuerung hydraulischer Hebezeuge", Seiten 458-460 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158740A2 (en) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Hydraulic overload protection device for a lifting apparatus
EP0158738A2 (en) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Hydraulic overload protection device for a loading crane
EP0158740A3 (en) * 1984-04-14 1988-10-19 Robert Bosch Gmbh Hydraulic overload protection device for a lifting apparatus
EP0158738A3 (en) * 1984-04-14 1988-10-19 Robert Bosch Gmbh Hydraulic overload protection device for a loading crane
CN106185633A (en) * 2016-08-24 2016-12-07 三汽车起重机械有限公司 Balancing valve apparatus, crane and elevating mechanism
CN106185633B (en) * 2016-08-24 2018-02-23 三一汽车起重机械有限公司 Balancing valve apparatus, crane and elevating mechanism

Also Published As

Publication number Publication date
AT368107B (en) 1982-09-10
EP0055247A3 (en) 1984-07-25
DE3175278D1 (en) 1986-10-09
ATA628080A (en) 1982-01-15
EP0055247B1 (en) 1986-09-03

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