EP2683645B1 - Boom of a loading crane - Google Patents

Boom of a loading crane Download PDF

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Publication number
EP2683645B1
EP2683645B1 EP12712877.5A EP12712877A EP2683645B1 EP 2683645 B1 EP2683645 B1 EP 2683645B1 EP 12712877 A EP12712877 A EP 12712877A EP 2683645 B1 EP2683645 B1 EP 2683645B1
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EP
European Patent Office
Prior art keywords
jib
cylinder
extension
piston rod
retraction
Prior art date
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Active
Application number
EP12712877.5A
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German (de)
French (fr)
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EP2683645A1 (en
Inventor
Eckhard Wimmer
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 AG
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Palfinger AG
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Publication date
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Priority to PL12712877T priority Critical patent/PL2683645T3/en
Publication of EP2683645A1 publication Critical patent/EP2683645A1/en
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Publication of EP2683645B1 publication Critical patent/EP2683645B1/en
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Classifications

    • 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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/42—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with jibs of adjustable configuration, e.g. foldable
    • 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
    • B66C23/54—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 with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
    • F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
    • 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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths

Definitions

  • the invention relates to a loading crane with a hydraulically actuated boom according to one of claims 1 to 13 and further relates to a vehicle with such a loading crane.
  • Hydraulically operable booms for loading cranes are already known in a variety of the prior art. So shows about the EP 0 566 720 B1 of 10 November 1992 a multi-stage telescopic boom, in particular for a loading crane on a truck, between each successive, telescopic nested arms each having a piston and cylinder hydraulic unit is arranged, wherein at least the cylinder of the innermost arm from the cylinder bottom axially into the tube Cylinder space is, which at least partially retracted piston against this sealed into the hollow piston rod, and thus seals the cylinder chamber relative to the interior of the hollow piston rod, the interior of each hollow piston rod via a preferably rigid line with the cylinder chamber of the next inner
  • Hydraulic unit is connected and that the interior of each hollow piston rod communicates with fully extended piston with the cylinder chamber of the same hydraulic unit.
  • the object of the invention is to provide an improved hydraulically actuated boom for a loading crane.
  • This run-in line makes it possible to supply oil to the outer side - that is to say, that which is furthest away from the crane column - which has not yet been fully retracted, until it has completely retracted.
  • the oil flows via the control valve into the inner thrust cylinder and causes it to retract.
  • the outer boom extension is that of lesser diameter
  • the inner boom extension is that of larger diameter, which of course could also be reversed, based on the outer and inner boom extension and / or the smaller and larger diameter.
  • the retraction line passes through at least the thrust piece cylinder of the inner boom extension without causing the working fluid in the retraction line communicates during traversal with this Schub consortiumzylinder.
  • the entry line is formed telescopically inside the thrust cylinder of the inner boom extension.
  • the length of the entry line can be adapted to the effective length of the thrust piece cylinder, that is to say that the telescopically formed entry line can move together with the thrust piece cylinder.
  • the entry line comprises at least two nested tubes which are telescopically movable relative to each other.
  • a telescopic design is particularly preferably produced by two nested tubes.
  • the thrust cylinder of the inner boom extension has at least one cylinder, at least one piston and at least one piston rod, wherein one of the two tubes is stationary in the cylinder of the thrust cylinder and the second tube is formed stationary in the piston rod of the thrust cylinder.
  • the stationary design of the two tubes in the thrust piece cylinder can ensure that both tubes move uniformly together with the thrust piece cylinder.
  • the outer of the two tubes has a recess in a lateral surface of the tube, wherein the recess is formed at an end region of the tube.
  • the piston has at least one extension channel, wherein the extension channel extends from a cylinder chamber into a piston rod chamber. Via an extension channel in the piston, the working medium can flow from the cylinder chamber into the piston rod chamber.
  • the piston has at least one entry channel, wherein the entry channel extends from the cylinder chamber into the piston rod chamber, wherein in the retraction a check valve is formed.
  • the piston rod has at least one piston rod channel, wherein the piston rod channel extends from one end region of the piston rod to the other end region of the piston rod, wherein the switching valve is arranged on the one end region and on another end region surrounding the piston rod chamber is formed, wherein the piston rod surrounding chamber is formed in the cylinder of the pusher cylinder.
  • At least one check valve is formed on the piston rod channel.
  • the working medium which is located in the piston rod chamber can escape from this when extending the thrust piece cylinder and - flow through the check valve - by traversing the piston rod channel.
  • the switching valve is designed as a directional control valve - preferably as a 2/2 way valve - is formed.
  • the switching valve is formed mechanically actuated. This can contribute to a cost-effective variant of a switching valve.
  • the boom at least one - preferably at least two - further inner boom extension (s) with thrust cylinder (s), wherein the working fluid of the Einfahrtechnisch between the tank and the mouth of the thrust cylinder of the outermost boom extension in any position of the thrust cylinder of the inner Boom extensions with the jib cylinders of the inner jib extensions communicate as long as the outermost jib extension has not reached its retracted position.
  • the use of multiple inner boom extensions and associated thrust cylinder can help increase the reach of the boom.
  • the invention further relates to a loading crane with a hydraulically actuated boom according to one of claims 1 to 14. Especially in loading cranes, such a hydraulically actuated boom can be advantageously used.
  • FIG. 1 shows a loading crane 101 with a crane column 102, a first boom 103 and a second boom 100.
  • the hydraulically actuated boom 100 has a plurality of boom extensions 1, 2, 3 and 4.
  • the boom extensions 1, 2, 3 and 4 are each retracted and retracted with associated thrust cylinder 11, 21, 31 and 41 respectively.
  • the loading crane 101 has in this preferred embodiment, a further third boom 104, which also has telescopically formed and hydraulically actuated boom extensions.
  • such loading cranes 101 are mounted on vehicles. However, they are also used stationary.
  • FIG. 2 shows a schematic representation of two thrust cylinder 21 and 11 for two outer 1 and inner boom extensions not shown 2.
  • the thrust cylinder 11 is disposed on the outer boom extension 1 and the thrust cylinder 21 on the inner boom extension 2.
  • both pusher cylinders 11 and 21 are fully retracted.
  • the extension line 7 or the working medium 5 located therein (not shown) is pressurized.
  • the pressurization spreads the working fluid 5 in the cylinder 26 and its cylinder chamber 261 and thereby displaces the piston 27 and thus the piston rod 28, the piston rod 28 moves out.
  • the working medium 5 could until now spread only in the cylinder chamber 261, whereby only the pusher cylinder 21 extends and not the pusher cylinder 11th
  • the piston rod 28 has at least one piston rod channel 282, wherein the piston rod channel 282 extends from one end portion of the piston rod 28 to the other end portion of the piston rod 28, wherein at one end portion of the switching valve 22 is disposed and at the other end a Piston rod 28 surrounding chamber 262 is formed, wherein the piston rod 28 surrounding chamber 262 is formed in the cylinder 26 of the pusher cylinder 21.
  • the working medium 5 (not shown), which is located in the chamber 262 surrounding the piston rod 28, must escape.
  • the working medium 5 can flow away from the piston rod 28 surrounding chamber 262 via the piston rod channel 282 and the check valve 283 from the thrust cylinder 21. Subsequently, the working medium 5 via the two telescopically formed tubes 23 and 24 flow back into a tank, not shown.
  • the telescopically formed tubes 23 and 24 are formed in the interior of the thrust cylinder 21, whereby a very compact thrust cylinder 21 is achieved.
  • the piston rod 28 After the piston rod 28 is substantially fully extended, there is an opening between the cylinder chamber 261 and the piston rod chamber 281. These two chambers 261 and 281 are interconnected via the extension channel 271, which is now open.
  • the opening of the Ausfahrkanals 271 was made possible by a recess 29 which is located in the lateral surface of the tube 23, said recess 29 is formed at an end portion of the tube 23. With this preferred embodiment, the recess 29 is formed as an opening in the shell of the tube 23.
  • Through the recess 29 and the exit channel 271 can now work medium 5 from the cylinder chamber 261 in the piston rod chamber 281 and flow from there via the extension line 7 to the cylinder chamber 161 of the cylinder 16 of the Schub consortiumzylinders 11.
  • the pressurized working fluid 5 now spreads in the cylinder chamber 161 of the thrust cylinder 11, whereby the piston 17 and the piston rod 18 extend.
  • the working medium 5 (not shown) in the retraction line 6 starts directly at the junction 12 of the thrust piece cylinder 11 of the outer boom extension 1, not shown.
  • the run-in line 6 extends transversely through the pusher cylinder 21 by two telescopically formed tubes 23 and 24.
  • the two tubes 23 and 24 are connected via a seal 25, whereby no working fluid from the two tubes 23 and 24 to the tubes 23 and 24 surrounding chambers 261 and 281 of the pusher cylinder 21 can escape.
  • the working medium 5 spreads in the piston rod 18 surrounding chamber 162, whereby the piston rod 18 and the piston 17 retract (shown situation in the FIG. 3 ).
  • the switching valve 22 is preferably mechanically actuated by a lever 51 on the thrust cylinder 21, whereby the inflow to the piston rod channel 282 for the working fluid 5 of the retraction line 6 is released.
  • the opening of the switching valve could be done in any other way, such as electrically.
  • the two tubes 23 and 24 are telescopically formed; they drive simultaneously with the piston 27 and the piston rod 28 (and also during the extension process).
  • the non-pressurized working fluid 5 in the cylinder chamber 261 is pushed out of the cylinder 26 during this retraction movement and can flow away via the extension conduit 7.
  • thrust cylinder 21 of this type are connected in series (see FIG. 4 ) so that the effluent working fluid 5 in the extension line 7 each flow through the successively connected thrust cylinder 21 through the piston rod chamber 281, then through the exit channel 271 and then through the recess 29 of the tube 23 and through the cylinder chamber 261.
  • both a sequential extension of the thrust cylinder 21 and 11 and a sequential retraction of the thrust cylinder 11 and 21 can be achieved.
  • the pusher cylinder 21 can retract only when the pusher cylinder 11 is substantially completely retracted and then the control valve 22 of the pusher cylinder 21 turns on, whereby only the pusher cylinder 21 can retract.
  • FIG. 4 shows a schematic representation of a hydraulically actuated boom 100 (see FIG. 1 ) for a loading crane 101 (see FIG. 1 ).
  • the hydraulically actuatable boom 100 has four boom extensions 1, 2, 3 and 4 (see FIG. 1 ), wherein a boom extension is formed as the outermost boom extension 1 and the three other three boom extensions 2, 3 and 4 are designed as inner boom extensions 2, 3 and 4.
  • the boom extensions 1, 2, 3 and 4 each have at least one thrust cylinder 11, 21, 31 and 41, with which the boom extensions 1, 2, 3 and 4 can be extended or retracted.
  • the hydraulically actuated boom 100 in this case has a hydraulic circuit for a working fluid 5 - in this preferred embodiment oil - with a retraction line 6 for pressurized retraction of the thrust cylinder 11, 21, 31 and 41, wherein the retraction line 6 in the thrust cylinder 11 of the outermost boom extension 1 opens.
  • the boom 100 further has an extension line 7 for the pressurized extension of the thrust cylinder 11, 21, 31 and 41.
  • the pusher cylinders 21, 31 and 41 each have one Switching valve 22, 32 and 42, which by reaching a defined retraction position of the next outer boom extension or its thrust cylinder 11, 21 and 31 - in particular when the outer boom extension 1,2 and 3 or their Schub Federationzylinder 11, 21 and 31 substantially are fully retracted - are switchable in the open position and thereby the next inner thrust cylinder 21, 31 and 41 of the inner boom extension 2, 3 and 4 can feed with pressurized working medium 5.
  • the working medium 5 communicates the Einfahrtechnisch 6 between a tank, not shown, and the junction 12 on the thrust cylinder 11 of the outermost boom extension 1 in any position of the thrust cylinder 21, 31 and 41 of the inner boom extensions 2, 3 and 4 with the thrust cylinder 21, 31 and 41st the inner boom extensions 2, 3 and 4 as long as the outermost boom extension 1 and the pusher cylinder 11 has not reached his / her entry position.
  • the entry line 6 traverses all three thrust cylinder, 21, 31 and 41 of the inner boom extensions 2, 3 and 4 without causing the working fluid 5 in the entrance line 6 - during the crossing - with the thrust cylinder 21, 31 and 41 communicates.
  • the entry line 6 is telescopically formed in the interior of the thrust cylinder 21, 31, 41 by two nested tubes 23 and 24 or 33 and 34 or 43 and 44 are formed, which are telescopically movable relative to each other.
  • the tube 23, 33 and 43 fixed in the cylinder of the associated thrust cylinder 21, 31 and 41 is formed and the second tube 24, 34 and 44 is stationary in the associated piston rod of the associated thrust cylinder 21, 31 and 41st educated.
  • each of the outer tube 23, 33 and 43 has a recess 29, 39 and 49 in the lateral surface of the associated tube, said recesses 29. 39 and 49 at an end portion of the tube 23, 33 and 43 are formed.
  • the switching valve 22, 32 and 42 is formed in this preferred embodiment as a 2/2 way valve and is operated mechanically via the levers 51, 52 and 53, respectively.
  • Both the extension and the retraction are sequential, that is, that only one thrust cylinder 11, 21, 31 or 41 off or. retracts.
  • the working medium 5 is always released only after essentially complete extension or retraction for the next outer thrust piece cylinder 31, 21 and 11 or for the next inside thrust piece cylinder 21, 31 and 41.
  • FIG. 5 shows a detailed view of a section through a pusher cylinder 21 in a position as in FIG. 3 shown when this is substantially fully extended.
  • the two telescopically formed tubes 23 and 24 In the interior of the thrust cylinder 21 extend the two telescopically formed tubes 23 and 24. In this case, these two tubes 23 and 24 extend transversely through the cylinder 26, the piston 27 and the piston rod 28.
  • This arranged in the thrust cylinder 21, telescopic line 6 - consisting of the two tubes 23 and 24 - makes it possible that required for retraction oil 5 through the thrust cylinder 21 (and 31 and 41 as in FIG. 4 shown) to lead forward to the thrust cylinder 11, wherein in this preferred embodiment, the rear, connected to the cylinder 26 larger tube 23 is connected and the smaller tube 24 is connected to the piston rod 28, wherein the smaller tube 24 into the larger tube 23 protrudes and is tightly guided in this.
  • This line 6 makes it possible, the foremost not yet retracted thrust cylinder 11 (see FIG. 3 ) to supply oil on the driving side until it has retracted completely.
  • the control valve 22 (see FIG. 3 ) is actuated (opened) to the nearest pusher cylinder 21 located behind. Then this thrust cylinder 21 can retract. This process will be consecutive performed until all thrust cylinder (21, 31, 41 see FIG. 4 ) are completely retracted.
  • control order is determined at any time by blocking the return oil flow, but always by controlled oil supply.
  • the return oil flow is always free both when entering and during extension.
  • the larger rear tube 23 is tightly guided in the piston 27 and has at the front end to the seal or guide an extension with radially arranged openings 29, the flow of the piston-side oil through the piston 27 and the piston rod 28 forward in the extended state release
  • the piston 27 has a check valve (273, see FIG. 3 ), which optionally opens at slightly retracted piston 27 when pressurized by the return oil flow from the rod side and releases the flow to the rear.
  • FIG. 6 shows a vehicle 200 with a loading crane 101 mounted thereon with a hydraulically actuatable boom 100 with boom extensions.

Description

Die Erfindung betrifft einen hydraulisch betätigbaren Ausleger für einen Ladekran, mit:

  • mindestens zwei Auslegerverlängerungen, wobei die eine Auslegerverlängerung als äußere Auslegerverlängerung ausgebildet ist und die zweite Auslegerverlängerung als innere Auslegerverlängerung ausgebildet ist, und
  • mindestens zwei Schubstückzylindern zum Aus- und Einfahren der mindestens zwei Auslegerverlängerungen,
  • einem hydraulischen Kreislauf für ein Arbeitsmedium - insbesondere Öl - mit einer Einfahrleitung zum druckbeaufschlagten Einfahren der Schubstückzylinder, wobei die Einfahrleitung in den Schubstückzylinder der äußeren Auslegerverlängerung einmündet, und
  • einem Tank zur Abgabe des Arbeitsmediums, und
  • einem Schaltventil, welches durch Erreichen einer definierten Einfahrposition der äußeren Auslegerverlängerung insbesondere wenn die äußere Auslegerverlängerung im Wesentlichen voll eingefahren ist - in Offenstellung schaltbar ist und dadurch den Schubstückzylinder der inneren Auslegerverlängerung mit druckbeaufschlagtem Arbeitsmedium speist.
The invention relates to a hydraulically actuatable boom for a loading crane, comprising:
  • at least two boom extensions, wherein the one boom extension is designed as an outer boom extension and the second boom extension is designed as an inner boom extension, and
  • at least two thrust cylinder for extending and retracting the at least two boom extensions,
  • a hydraulic circuit for a working fluid - in particular oil - with a Einfahrleitung for pressurized retraction of the thrust piece cylinder, the Einfahrleitung opens into the thrust cylinder of the outer boom extension, and
  • a tank for dispensing the working fluid, and
  • a switching valve which, by reaching a defined retraction position of the outer boom extension, in particular when the outer boom extension is substantially fully retracted - is switchable in the open position and thereby feeds the thrust cylinder of the inner boom extension with pressurized working fluid.

Weiters betrifft die Erfindung einen Ladekran mit einem hydraulisch betätigbaren Ausleger nach einem der Ansprüche 1 bis 13 und des weiteren ein Fahrzeug mit einem solchen Ladekran.Furthermore, the invention relates to a loading crane with a hydraulically actuated boom according to one of claims 1 to 13 and further relates to a vehicle with such a loading crane.

Hydraulisch betätigbare Ausleger für Ladekräne sind bereits in einer Vielzahl aus dem Stande der Technik heraus bekannt. So zeigt etwa die EP 0 566 720 B1 vom 10. November 1992 einen mehrstufigen Teleskopausleger, insbesondere für einen Ladekran an einem Lastfahrzeug, wobei zwischen aneinander folgenden, teleskopartigen ineinander angeordneten Armen jeweils eine Kolben und Zylinder aufweisende Hydraulikeinheit angeordnet ist, wobei zumindest beim Zylinder des innersten Armes vom Zylinderboden ein Rohr axial in den Zylinderraum steht, welches bei zumindest teilweise eingefahrenem Kolben gegenüber diesem abgedichtet in die hohle Kolbenstange reicht, und damit den Zylinderraum gegenüber dem Innenraum der hohlen Kolbenstange abdichtet, wobei der Innenraum jeder hohlen Kolbenstange über eine vorzugsweise starre Leitung mit dem Zylinderraum der nächst innerenHydraulically operable booms for loading cranes are already known in a variety of the prior art. So shows about the EP 0 566 720 B1 of 10 November 1992 a multi-stage telescopic boom, in particular for a loading crane on a truck, between each successive, telescopic nested arms each having a piston and cylinder hydraulic unit is arranged, wherein at least the cylinder of the innermost arm from the cylinder bottom axially into the tube Cylinder space is, which at least partially retracted piston against this sealed into the hollow piston rod, and thus seals the cylinder chamber relative to the interior of the hollow piston rod, the interior of each hollow piston rod via a preferably rigid line with the cylinder chamber of the next inner

Hydraulikeinheit verbunden ist und dass der Innenraum jeder hohlen Kolbenstange bei voll ausgefahrenem Kolben mit dem Zylinderraum derselben Hydraulikeinheit kommuniziert.Hydraulic unit is connected and that the interior of each hollow piston rod communicates with fully extended piston with the cylinder chamber of the same hydraulic unit.

Das Dokument EP 1 270 494 A1 offenbart einen Ausleger mit den Merkmalen des Oberbegriffs des Anspruchs 1.The document EP 1 270 494 A1 discloses a boom having the features of the preamble of claim 1.

Aufgabe der Erfindung ist es, einen verbesserten hydraulisch betätigbaren Ausleger für einen Ladekran anzugeben.The object of the invention is to provide an improved hydraulically actuated boom for a loading crane.

Diese Aufgabe wird durch die Merkmale des Anspruches 1 gelöst.This object is solved by the features of claim 1.

Dadurch, dass das Arbeitsmedium der Einfahrleitung zwischen Tank und Einmündung am Schubstückzylinder der äußeren Auslegerverlängerung in keiner Stellung des Schubstückzylinders der inneren Auslegerverlängerung mit dem Schubstückzylinder der inneren Auslegerverlängerung kommuniziert, solange die äußere Auslegerverlängerung nicht ihre Einfahrposition erreicht hat, erzielt man eine vom Schubstückzylinder der inneren Auslegerverlängerung unabhängige Einfahrleitung, wodurch der Schubstückzylinder der äußeren Auslegerverlängerung direkt mit dem Arbeitsmedium druckbeaufschlagt werden kann - selbst bei voll ausgefahrenem Schubstückzylinder der inneren Auslegerverlängerung.Characterized in that the working medium of the Einfahrleitung between the tank and the mouth of the thrust cylinder of the outer boom extension in any position of the Schubstückzylinders the inner boom extension communicates with the Schubstückzylinder the inner boom extension, as long as the outer boom extension has not reached their retracted position, you get one of the thrust cylinder of the inner boom extension independent entry line, whereby the thrust cylinder of the outer boom extension can be pressurized directly with the working fluid - even with fully extended thrust cylinder of the inner boom extension.

Diese Einfahrleitung ermöglicht es, den äußeren - also den von der Kransäule am weitesten weg befindlichen - noch nicht voll eingefahrenem Schubstückzylinder einfahrseitig Öl zuzuführen, bis dieser ganz eingefahren ist. In diesem Zustand wird das Schaltventil zum inneren - also nächst dahinter liegenden, näher an der Kransäule befindlichen - Schubstückzylinder betätigt - das heißt geöffnet - wodurch dem äußeren Schubstückzylinder kein Öl mehr zugeführt wird, da er bereits voll eingefahren ist. Das Öl fließt über das Steuerventil in den inneren Schubstückzylinder und veranlasst diesen einzufahren.This run-in line makes it possible to supply oil to the outer side - that is to say, that which is furthest away from the crane column - which has not yet been fully retracted, until it has completely retracted. In this state, the switching valve to the inner - ie located next, closer to the crane column located - Schubstückzylinder actuated - that is open - whereby the outer Schubstückzylinder no oil is supplied, since he is already fully retracted. The oil flows via the control valve into the inner thrust cylinder and causes it to retract.

Somit wird eine Folgesteuerung erzielt, wodurch ein Schubstückzylinder nach dem anderen einfährt und dabei die Einfahrleitung direkt in den äußeren Schubstückzylinder einmündet. Diesbezüglich sei darauf hingewiesen, dass mit "innerer Schubstückzylinder" der Schubstückzylinder der inneren Auslegerverlängerung gemeint ist und mit "äußerer Schubstückzylinder" der Schubstückzylinder der äußeren Auslegerverlängerung gemeint ist, wobei diese Formulierungen dem Fachmann als gebräuchliche Abkürzungen bekannt sind.Thus, a sequential control is achieved, whereby a thrust piece cylinder retracts after another, thereby opening the Einfahrleitung directly into the outer thrust cylinder. In this regard, it should be noted that the term "inner pintle cylinder" refers to the pintle cylinder of the inner boom extension, and "outer pintle cylinder" refers to the pintle cylinder of the outer boom extension, these formulations being known to those skilled in the art as conventional abbreviations.

Im Normalfall ist dabei die äußere Auslegerverlängerung jene mit geringerem Durchmesser und die innere Auslegerverlängerung jene mit größerem Durchmesser, dies könnte natürlich ebenso - bezogen auf die äußere und innere Auslegerverlängerung und /oder den geringeren und größeren Durchmesser - umgekehrt sein.Normally, the outer boom extension is that of lesser diameter, and the inner boom extension is that of larger diameter, which of course could also be reversed, based on the outer and inner boom extension and / or the smaller and larger diameter.

Weitere vorteilhafte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen definiert.Further advantageous embodiments of the invention are defined in the dependent claims.

Als besonders vorteilhaft hat es sich herausgestellt, wenn die Einfahrleitung zumindest den Schubstückzylinder der inneren Auslegerverlängerung durchquert ohne dass dabei das Arbeitsmedium in der Einfahrleitung während der Durchquerung mit diesem Schubstückzylinder kommuniziert. Durch die Führung der Einfahrleitung durch den Schubstückzylinder der inneren Auslegerverlängerung, kann eine äußerst kompakte Bauweise erzielt werden.To be particularly advantageous, it has been found that the retraction line passes through at least the thrust piece cylinder of the inner boom extension without causing the working fluid in the retraction line communicates during traversal with this Schubstückzylinder. By guiding the Einfahrleitung by the thrust cylinder of the inner boom extension, an extremely compact design can be achieved.

Gemäß einem bevorzugten Ausführungsbeispiel kann vorgesehen sein, dass die Einfahrleitung im Inneren des Schubstückzylinders der inneren Auslegerverlängerung teleskopisch ausgebildet ist. Durch eine teleskopische Ausbildung der Einfahrleitung kann sich die Länge der Einfahrleitung der effektiven Länge des Schubstückzylinders anpassen, das heißt, dass die teleskopisch ausgebildete Einfahrleitung zusammen mit dem Schubstückzylinder verfahren kann.According to a preferred embodiment it can be provided that the entry line is formed telescopically inside the thrust cylinder of the inner boom extension. By means of a telescopic design of the entry line, the length of the entry line can be adapted to the effective length of the thrust piece cylinder, that is to say that the telescopically formed entry line can move together with the thrust piece cylinder.

Weiters kann bevorzugt vorgesehen sein, dass die Einfahrleitung wenigstens zwei ineinander verschachtelte Rohre aufweist welche teleskopisch zueinander bewegbar ausgebildet sind. Eine teleskopische Ausbildung ist besonders bevorzugt durch zwei ineinander verschachtelte Rohre herstellbar.Furthermore, it can preferably be provided that the entry line comprises at least two nested tubes which are telescopically movable relative to each other. A telescopic design is particularly preferably produced by two nested tubes.

Als besonders vorteilhaft hat es sich erwiesen, wenn zwischen den beiden ineinander verschachtelten Rohren eine Dichtung ausgebildet ist. Durch die Ausbildung einer Dichtung kann erzielt werden, dass das Arbeitsmedium, das innerhalb der verschachtelten Rohre verläuft, nicht aus diesen austreten und in den Innenraum des Schubstückzylinders fließen kann.It has proved to be particularly advantageous if a seal is formed between the two nested tubes. By forming a seal can be achieved that the working fluid that runs within the nested tubes, not emerge from these and can flow into the interior of the thrust cylinder.

Besonders bevorzugt kann vorgesehen sein, dass der Schubstückzylinder der inneren Auslegerverlängerung wenigstens einen Zylinder, wenigstens einen Kolben und wenigstens eine Kolbenstange aufweist, wobei eines der beiden Rohre ortsfest im Zylinder des Schubstückzylinders ausgebildet ist und das zweite Rohr ortsfest in der Kolbenstange des Schubstückzylinders ausgebildet ist. Durch die ortfeste Ausbildung der beiden Rohre im Schubstückzylinder kann gewährleistet werden, dass beide Rohre zusammen mit dem Schubstückzylinder gleichmäßig verfahren.Particularly preferably, it can be provided that the thrust cylinder of the inner boom extension has at least one cylinder, at least one piston and at least one piston rod, wherein one of the two tubes is stationary in the cylinder of the thrust cylinder and the second tube is formed stationary in the piston rod of the thrust cylinder. The stationary design of the two tubes in the thrust piece cylinder can ensure that both tubes move uniformly together with the thrust piece cylinder.

Als besonders vorteilhaft hat es sich dabei herausgestellt, wenn das äußere der beiden Rohre eine Ausnehmung in einer Mantelfläche des Rohres aufweist, wobei die Ausnehmung an einem Endbereich des Rohres ausgebildet ist. Durch die Ausbildung einer Ausnehmung an einem Endbereich des Rohres kann erzielt werden, dass bei im Wesentlichen voll ausgefahrenen Rohren über die Ausnehmung das Arbeitsmedium vom Zylinder in die Kolbenstange gelangen kann. Ebenso wäre es natürlich auch vorstellbar, diese Funktionalität auf andere Art und Weise zu bewerkstelligen, etwa in dem eines der im Wesentlichen voll ausgefahrenen Rohre ein Rückschlagventil öffnet, wodurch das Arbeitsmedium vom Zylinder in die Kolbenstange gelangen könnte.It has proven to be particularly advantageous if the outer of the two tubes has a recess in a lateral surface of the tube, wherein the recess is formed at an end region of the tube. By forming a recess at an end region of the tube, it can be achieved that, when the tubes are substantially fully extended, the working medium can pass from the cylinder into the piston rod via the recess. Likewise, it would of course also be conceivable to accomplish this functionality in other ways, such as in one of the substantially fully extended tubes opens a check valve, whereby the working fluid could pass from the cylinder into the piston rod.

Gemäß einem bevorzugten Ausführungsbeispiel kann vorgesehen sein, dass der Kolben mindestens einen Ausfahrkanal aufweist, wobei sich der Ausfahrkanal von einer Zylinderkammer in eine Kolbenstangenkammer erstreckt. Über einen Ausfahrkanal im Kolben kann das Arbeitsmedium von der Zylinderkammer in die Kolbenstangenkammer fließen.According to a preferred embodiment it can be provided that the piston has at least one extension channel, wherein the extension channel extends from a cylinder chamber into a piston rod chamber. Via an extension channel in the piston, the working medium can flow from the cylinder chamber into the piston rod chamber.

Als vorteilhaft hat es sich weiters herausgestellt, dass der Kolben mindestens einen Einfahrkanal aufweist, wobei sich der Einfahrkanal von der Zylinderkammer in die Kolbenstangenkammer erstreckt, wobei in dem Einfahrkanal ein Rückschlagventil ausgebildet ist. Durch einen Einfahrkanal im Kolben kann erzielt werden, dass während des Einfahrens das Arbeitsmedium von der Kolbenstangenkammer in die Zylinderkammer fließen kann.As advantageous, it has further been found that the piston has at least one entry channel, wherein the entry channel extends from the cylinder chamber into the piston rod chamber, wherein in the retraction a check valve is formed. Through a run-in channel in the piston can be achieved that the working fluid can flow from the piston rod chamber into the cylinder chamber during retraction.

Als vorteilhaft hat es sich herausgestellt, wenn die Kolbenstange mindestens einen Kolbenstangenkanal aufweist, wobei sich der Kolbenstangenkanal von einem Endbereich der Kolbenstange zum anderen Endbereich der Kolbenstange hin erstreckt, wobei an dem einen Endbereich das Schaltventil angeordnet ist und am anderen Endbereich einen die Kolbenstange umgebende Kammer ausgebildet ist, wobei die Kolbenstange umgebende Kammer im Zylinder des Schubstückzylinders ausgebildet ist. Durch die Ausbildung eines Kolbenstangenkanals kann das druckbeaufschlagte Arbeitsmedium in die die Kolbenstange umgebende Kammer fließen und dadurch den Schubstückzylinder einfahren.It has proven advantageous if the piston rod has at least one piston rod channel, wherein the piston rod channel extends from one end region of the piston rod to the other end region of the piston rod, wherein the switching valve is arranged on the one end region and on another end region surrounding the piston rod chamber is formed, wherein the piston rod surrounding chamber is formed in the cylinder of the pusher cylinder. By forming a piston rod channel, the pressurized working medium can flow into the chamber surrounding the piston rod and thereby retract the thrust piece cylinder.

Bevorzugt kann weiters vorgesehen sein, dass am Kolbenstangenkanal wenigstens ein Rückschlagventil ausgebildet ist. Durch die Ausbildung eines Rückschlagventils am Kolbenstangenkanal kann beim Ausfahren des Schubstückzylinders das Arbeitsmedium, welches sich in der Kolbenstange umgebenden Kammer befindet, aus dieser austreten und - mittels Durchquerung des Kolbenstangenkanals - über das Rückschlagventil abfließen.Preferably, it may further be provided that at least one check valve is formed on the piston rod channel. By forming a check valve on the piston rod channel, the working medium which is located in the piston rod chamber can escape from this when extending the thrust piece cylinder and - flow through the check valve - by traversing the piston rod channel.

Gemäß einem möglichen Ausführungsbeispiel kann vorgesehen sein, dass das Schaltventil als Wegeventil - vorzugsweise als 2/2 Wegeventil - ausgebildet ist.According to a possible embodiment it can be provided that the switching valve is designed as a directional control valve - preferably as a 2/2 way valve - is formed.

Gemäß einem bevorzugten Ausführungsbeispiel kann vorgesehen sein, dass das Schaltventil mechanisch betätigbar ausgebildet ist. Dies kann zu einer kostengünstigen Variante eines Schaltventils beitragen.According to a preferred embodiment it can be provided that the switching valve is formed mechanically actuated. This can contribute to a cost-effective variant of a switching valve.

Dabei ist besonders bevorzugt vorgesehen, dass der Ausleger wenigstens eine - vorzugsweise wenigstens zwei - weitere innere Auslegerverlängerung(en) mit Schubstückzylinder(n) aufweist, wobei das Arbeitsmedium der Einfahrleitung zwischen Tank und Einmündung am Schubstückzylinder der äußersten Auslegerverlängerung in keiner Stellung der Schubstückzylinder der inneren Auslegerverlängerungen mit den Schubstückzylindern der inneren Auslegerverlängerungen kommuniziert solange die äußerste Auslegerverlängerung nicht ihre Einfahrposition erreicht hat. Die Verwendung mehrerer innerer Auslegerverlängerungen und dazugehörigen Schubstückzylindern kann dazu beitragen, die Reichweite des Auslegers zu erhöhen.It is particularly preferably provided that the boom at least one - preferably at least two - further inner boom extension (s) with thrust cylinder (s), wherein the working fluid of the Einfahrleitung between the tank and the mouth of the thrust cylinder of the outermost boom extension in any position of the thrust cylinder of the inner Boom extensions with the jib cylinders of the inner jib extensions communicate as long as the outermost jib extension has not reached its retracted position. The use of multiple inner boom extensions and associated thrust cylinder can help increase the reach of the boom.

Die Erfindung betrifft weiters einen Ladekran mit einem hydraulisch betätigbaren Ausleger nach einem der Ansprüche 1 bis 14. Speziell bei Ladekränen kann ein solcher hydraulisch betätigbarer Ausleger vorteilhaft eingesetzt werden.The invention further relates to a loading crane with a hydraulically actuated boom according to one of claims 1 to 14. Especially in loading cranes, such a hydraulically actuated boom can be advantageously used.

Schutz wird auch begehrt für Fahrzeug mit einem solchen Ladekran. Speziell auf Fahrzeugen können vorteilhaft solche Ladekräne mit hydraulisch betätigbaren Auslegern eingesetzt werden.Protection is also sought for vehicle with such a loading crane. Especially on vehicles advantageous loading cranes can be used with hydraulically actuated arms.

Weitere Einzelheiten und Vorteile der vorliegenden Erfindung werden anhand der Figurenbeschreibung unter Bezugnahme auf die in der Zeichnung dargestellten Ausführungsbeispiele im Folgenden nähere erläutert. Darin zeigen.

Fig. 1
eine Seitenansicht eines Ladekrans mit hydraulisch betätigbaren Auslegern und Auslegerverlängerungen,
Fig. 2
eine schematische Darstellung zweier Schubstückzylinder, wobei ein Schubstückzylinder für eine äußere Auslegerverlängerung vorgesehen ist und einer für eine innere Auslegerverlängerung, wobei sich beide Schubstückzylinder im eingefahrenen Zustand befinden,
Fig. 3
eine schematische Darstellung zweier Schubstückzylinder, wobei ein Schubstückzylinder vollständig ausgefahren ist und ein Schubstückzylinder eingefahren ist,
Fig. 4
eine schematische Darstellung von vier Schubstückzylindern mit einem Schubstückzylinder für eine äußerste Auslegerverlängerung und drei Schubstückzylinder für drei innere Auslegerverlängerungen,
Fig. 5
ein Schnitt durch eine Detailansicht eines Schubstückzylinders.
Fig. 6
ein Fahrzeug mit einem Ladekran mit einem Ausleger mit Auslegerverlängerungen
Further details and advantages of the present invention will be explained with reference to the figure description with reference to the embodiments illustrated in the drawings in more detail below. Show in it.
Fig. 1
a side view of a loading crane with hydraulically actuatable arms and boom extensions,
Fig. 2
a schematic representation of two Schubstückzylinder, wherein a pusher cylinder is provided for an outer boom extension and one for an inner boom extension, both Schubstückzylinder are in the retracted state,
Fig. 3
a schematic representation of two thrust cylinder, with a thrust cylinder is fully extended and a thrust cylinder is retracted,
Fig. 4
a schematic representation of four Schubstückzylindern with a pusher cylinder for an outermost boom extension and three Schubstückzylinder for three inner boom extensions,
Fig. 5
a section through a detailed view of a thrust cylinder.
Fig. 6
a vehicle with a loading crane with a boom with boom extensions

Figur 1 zeigt einen Ladekran 101 mit einer Kransäule 102, einem ersten Ausleger 103 und einem zweiten Ausleger 100. Der hydraulisch betätigbare Ausleger 100 weist mehrere Auslegerverlängerungen 1, 2, 3 und 4 auf. Die Auslegerverlängerungen 1, 2, 3 und 4 werden jeweils mit zugehörigen Schubstückzylindern 11, 21, 31 bzw. 41 ausund eingefahren. FIG. 1 shows a loading crane 101 with a crane column 102, a first boom 103 and a second boom 100. The hydraulically actuated boom 100 has a plurality of boom extensions 1, 2, 3 and 4. The boom extensions 1, 2, 3 and 4 are each retracted and retracted with associated thrust cylinder 11, 21, 31 and 41 respectively.

Der Ladekran 101 weist in diesem bevorzugten Ausführungsbeispiel einen weiteren dritten Ausleger 104 auf, der ebenfalls teleskopisch ausgebildete und hydraulisch betätigbare Auslegerverlängerungen aufweist.The loading crane 101 has in this preferred embodiment, a further third boom 104, which also has telescopically formed and hydraulically actuated boom extensions.

Bevorzugterweise werden solche Ladekräne 101 auf Fahrzeugen montiert. Sie kommen jedoch auch ebenso stationär zum Einsatz.Preferably, such loading cranes 101 are mounted on vehicles. However, they are also used stationary.

Figur 2 zeigt eine schematische Darstellung zweier Schubstückzylinder 21 und 11 für zwei nicht dargestellte äußere 1 und innere Auslegerverlängerungen 2. Dabei ist der Schubstückzylinder 11 an der äußeren Auslegerverlängerung 1 und der Schubstückzylinder 21 an der inneren Auslegerverlängerung 2 angeordnet. In dieser Figur 2 sind beide Schubstückzylinder 11 und 21 vollständig eingefahren. FIG. 2 shows a schematic representation of two thrust cylinder 21 and 11 for two outer 1 and inner boom extensions not shown 2. Here, the thrust cylinder 11 is disposed on the outer boom extension 1 and the thrust cylinder 21 on the inner boom extension 2. In this FIG. 2 both pusher cylinders 11 and 21 are fully retracted.

Ausfahrvorgang:extension process:

Zum Ausfahren wird die Ausfahrleitung 7 bzw. das sich darin befindliche Arbeitsmedium 5 (nicht dargestellt) mit Druck beaufschlagt. Die Ausfahrleitung 7 mündet in die Zylinderkammer 261 des Zylinders 26. Durch die Druckbeaufschlagung breitet sich das Arbeitsmedium 5 im Zylinder 26 bzw. dessen Zylinderkammer 261 aus und verschiebt dabei den Kolben 27 und somit auch die Kolbenstange 28, die Kolbenstange 28 fährt aus. Das Arbeitsmedium 5 konnte sich bis jetzt nur in der Zylinderkammer 261 ausbreiten, wodurch ausschließlich der Schubstückzylinder 21 ausfährt und nicht der Schubstückzylinder 11.To extend, the extension line 7 or the working medium 5 located therein (not shown) is pressurized. By the pressurization spreads the working fluid 5 in the cylinder 26 and its cylinder chamber 261 and thereby displaces the piston 27 and thus the piston rod 28, the piston rod 28 moves out. The working medium 5 could until now spread only in the cylinder chamber 261, whereby only the pusher cylinder 21 extends and not the pusher cylinder 11th

In diesem bevorzugten Ausführungsbeispiel weist die Kolbenstange 28 mindestens einen Kolbenstangenkanal 282 auf, wobei sich der Kolbenstangenkanal 282 von einem Endbereich der Kolbenstange 28 zum anderen Endbereich der Kolbenstange 28 hin erstreckt, wobei an dem einen Endbereich das Schaltventil 22 angeordnet ist und am anderen Endbereich eine die Kolbenstange 28 umgebende Kammer 262 ausgebildet ist, wobei die Kolbenstange 28 umgebende Kammer 262 im Zylinder 26 des Schubstückzylinders 21 ausgebildet ist.In this preferred embodiment, the piston rod 28 has at least one piston rod channel 282, wherein the piston rod channel 282 extends from one end portion of the piston rod 28 to the other end portion of the piston rod 28, wherein at one end portion of the switching valve 22 is disposed and at the other end a Piston rod 28 surrounding chamber 262 is formed, wherein the piston rod 28 surrounding chamber 262 is formed in the cylinder 26 of the pusher cylinder 21.

Damit die Kolbenstange 28 ausfahren kann, muss sich das Arbeitsmedium 5 (nicht dargestellt), welches sich in der die Kolbenstange 28 umgebende Kammer 262 befindet, entweichen. Dazu kann das Arbeitsmedium 5 von der die Kolbenstange 28 umgebenden Kammer 262 über den Kolbenstangenkanal 282 und das Rückschlagventil 283 aus dem Schubstückzylinder 21 abfließen. Anschließend kann das Arbeitsmedium 5 über die beiden teleskopisch ausgebildeten Rohre 23 und 24 zurück in einen nicht dargestellten Tank fließen.In order for the piston rod 28 to be able to extend, the working medium 5 (not shown), which is located in the chamber 262 surrounding the piston rod 28, must escape. For this purpose, the working medium 5 can flow away from the piston rod 28 surrounding chamber 262 via the piston rod channel 282 and the check valve 283 from the thrust cylinder 21. Subsequently, the working medium 5 via the two telescopically formed tubes 23 and 24 flow back into a tank, not shown.

In diesem bevorzugten Ausführungsbeispiel sind die teleskopisch ausgebildeten Rohre 23 und 24 im Inneren des Schubstückzylinders 21 ausgebildet, wodurch ein sehr kompakter Schubstückzylinder 21 erzielbar wird.In this preferred embodiment, the telescopically formed tubes 23 and 24 are formed in the interior of the thrust cylinder 21, whereby a very compact thrust cylinder 21 is achieved.

Nachdem die Kolbenstange 28 im Wesentlichen vollständig ausgefahren ist, ergibt sich eine Öffnung zwischen der Zylinderkammer 261 und der Kolbenstangenkammer 281. Diese beiden Kammern 261 und 281 sind über den Ausfahrkanal 271, welcher jetzt offen ist, miteinander verbunden. Die Öffnung des Ausfahrkanals 271 wurde durch eine Ausnehmung 29 ermöglicht, welche sich in der Mantelfläche des Rohres 23 befindet, wobei diese Ausnehmung 29 an einem Endbereich des Rohres 23 ausgebildet ist. Mit diesem bevorzugten Ausführungsbeispiel ist die Ausnehmung 29 als Durchbruch im Mantel des Rohres 23 ausgebildet. Durch die Ausnehmung 29 und den Ausfahrkanal 271 kann nun Arbeitsmedium 5 vom Zylinderraum 261 in die Kolbenstangenkammer 281 strömen und von dort aus weiter über die Ausfahrleitung 7 zu der Zylinderkammer 161 des Zylinders 16 des Schubstückzylinders 11. Das druckbeaufschlagte Arbeitsmedium 5 breitet sich nun in der Zylinderkammer 161 des Schubstückzylinders 11 aus, wodurch der Kolben 17 und die Kolbenstange 18 ausfahren.After the piston rod 28 is substantially fully extended, there is an opening between the cylinder chamber 261 and the piston rod chamber 281. These two chambers 261 and 281 are interconnected via the extension channel 271, which is now open. The opening of the Ausfahrkanals 271 was made possible by a recess 29 which is located in the lateral surface of the tube 23, said recess 29 is formed at an end portion of the tube 23. With this preferred embodiment, the recess 29 is formed as an opening in the shell of the tube 23. Through the recess 29 and the exit channel 271 can now work medium 5 from the cylinder chamber 261 in the piston rod chamber 281 and flow from there via the extension line 7 to the cylinder chamber 161 of the cylinder 16 of the Schubstückzylinders 11. The pressurized working fluid 5 now spreads in the cylinder chamber 161 of the thrust cylinder 11, whereby the piston 17 and the piston rod 18 extend.

Das Arbeitsmedium 5, welches sich in der die Kolbenstange 18 umgebenden Kammer 162 befindet, kann bei diesem Ausfahrvorgang über die Einfahrleitung 6 abfließen. Des Weiteren fließt dann das Arbeitsmedium 6 wie gehabt über die beiden Rohre 24 und 23 zurück in den nicht dargestellten Tank. Dies erfolgt wiederum, wie bereits erwähnt, bevorzugterweise durch den Schubstückzylinder 21 hindurch, ohne dass dabei das Arbeitsmedium 5 während dieser Durchquerung mit diesem Schubstückzylinder 21 kommuniziert.The working medium 5, which is located in the chamber 162 surrounding the piston rod 18, can flow away via the entry line 6 in this extension operation. Furthermore, then the working medium 6 flows as usual via the two tubes 24 and 23 back into the tank, not shown. This, in turn, takes place, as already mentioned, preferably through the thrust piece cylinder 21, without the working medium 5 communicating with this thrust piece cylinder 21 during this traversal.

Einfahrvorgang:retraction:

Zum Einfahren wird die Einfahrleitung 6 mit Druck beaufschlagt. Das Arbeitsmedium 5 (nicht dargestellt) in der Einfahrleitung 6 setzt direkt an der Einmündung 12 des Schubstückzylinders 11 der nicht dargestellten äußeren Auslegerverlängerung 1 an. Die Einfahrleitung 6 verläuft dabei quer durch den Schubstückzylinder 21 durch zwei teleskopisch ausgebildete Rohre 23 und 24. Die beiden Rohre 23 und 24 sind über eine Dichtung 25 miteinander verbunden, wodurch kein Arbeitsmedium aus den beiden Rohren 23 und 24 hin zu den diese Rohre 23 und 24 umgebende Kammern 261 und 281 des Schubstückzylinders 21 austreten kann. Durch die Druckbeaufschlagung auf die Einfahrleitung 6 breitet sich das Arbeitsmedium 5 in der die Kolbenstange 18 umgebende Kammer 162 aus, wodurch die Kolbenstange 18 und der Kolben 17 einfahren (dargestellte Situation in der Figur 3).To retract the inlet line 6 is pressurized. The working medium 5 (not shown) in the retraction line 6 starts directly at the junction 12 of the thrust piece cylinder 11 of the outer boom extension 1, not shown. The run-in line 6 extends transversely through the pusher cylinder 21 by two telescopically formed tubes 23 and 24. The two tubes 23 and 24 are connected via a seal 25, whereby no working fluid from the two tubes 23 and 24 to the tubes 23 and 24 surrounding chambers 261 and 281 of the pusher cylinder 21 can escape. By applying pressure to the inlet line 6, the working medium 5 spreads in the piston rod 18 surrounding chamber 162, whereby the piston rod 18 and the piston 17 retract (shown situation in the FIG. 3 ).

Sobald der Schubstückzylinder 11 vollständig eingefahren ist, wird bevorzugterweise mechanisch über einen Hebel 51 das Schaltventil 22 am Schubstückzylinder 21 betätigt, wodurch der Zufluss zu dem Kolbenstangenkanal 282 für das Arbeitsmedium 5 der Einfahrleitung 6 frei geschalten wird. Ebenso könnte das Öffnen des Schaltventils auch auf jede andere erdenkliche Weise erfolgen, wie etwa elektrisch.Once the pusher cylinder 11 is fully retracted, the switching valve 22 is preferably mechanically actuated by a lever 51 on the thrust cylinder 21, whereby the inflow to the piston rod channel 282 for the working fluid 5 of the retraction line 6 is released. Likewise, the opening of the switching valve could be done in any other way, such as electrically.

Nun kann das Arbeitsmedium 5 in der Einfahrleitung 6 über das Steuerventil 22 und den Kolbenstangenkanal 282 in die die Kolbenstange 28 umgebende Kammer 282 einfließen und sich darin ausbreiten, wodurch der Kolben 27 und die Kolbenstange 28 einfahren.Now, the working medium 5 in the inlet line 6 via the control valve 22 and the piston rod channel 282 into the piston rod 28 surrounding chamber 282 and flow into it, whereby the piston 27 and the piston rod 28 retract.

Aufgrund dessen, dass die beiden Rohre 23 und 24 teleskopartig ausgebildet sind; fahren diese gleichzeitig mit dem Kolben 27 und der Kolbenstange 28 ein (und ebenso aus beim Ausfahrvorgang).Due to the fact that the two tubes 23 and 24 are telescopically formed; they drive simultaneously with the piston 27 and the piston rod 28 (and also during the extension process).

Das nicht unter Druck befindliche Arbeitsmedium 5 in der Zylinderkammer 261 wird bei dieser Einfahrbewegung aus dem Zylinder 26 hinausgedrückt und kann über die Ausfahrleitung 7 abfließen.The non-pressurized working fluid 5 in the cylinder chamber 261 is pushed out of the cylinder 26 during this retraction movement and can flow away via the extension conduit 7.

Wenn mehrere Schubstückzylinder 21 dieser Bauart hintereinander geschalten sind (siehe Figur 4) so kann das abfließende Arbeitsmedium 5 in der Ausfahrleitung 7 jeweils durch die hintereinander geschalteten Schubstückzylinder 21 durch die Kolbenstangenkammer 281, anschließend durch den Ausfahrkanal 271 und dann durch die Ausnehmung 29 des Rohres 23 und durch die Zylinderkammer 261 abfließen.If several thrust cylinder 21 of this type are connected in series (see FIG. 4 ) so that the effluent working fluid 5 in the extension line 7 each flow through the successively connected thrust cylinder 21 through the piston rod chamber 281, then through the exit channel 271 and then through the recess 29 of the tube 23 and through the cylinder chamber 261.

Sollte die Ausnehmung 29 des Rohres 23 bereits wieder verschlossen sein, da zum Beispiel der Kolben 27 und die Kolbenstange 28 bereits ein Stück eingefahren sind und somit die Ausnehmung 29 verschließen, so kann das Arbeitsmedium 5 trotzdem durch diesen Schubstückzylinder 21 hindurch entweichen, da im Kolben 27 der Einfahrkanal 272 ausgebildet ist, welcher ein Rückschlagventil 273 aufweist. Somit kann bei teilweise oder ganz eingefahrenen Kolben 27 bzw. Kolbenstange 28 Öl 5 aus der Ausfahrleitung 7 über die Kolbenstange 281 das Rückschlagventil 273 des Einfahrkanals 272 und weiter über die Zylinderkammer 261 durch den Schubstückzylinder 21 hindurchfließen.If the recess 29 of the tube 23 already be closed again, since for example the piston 27 and the piston rod 28 are already retracted a piece and thus close the recess 29, the working fluid 5 can still escape through this thrust cylinder 21 through there in the piston 27 of the entry channel 272 is formed, which has a check valve 273. Thus, with partially or fully retracted piston 27 or piston rod 28, oil 5 can flow out of the extension line 7 via the piston rod 281, the check valve 273 of the retraction channel 272 and further over the cylinder chamber 261 through the thrust piece cylinder 21.

Durch eine derartige Ausbildung einer Folgesteuerung wird sowohl ein sequenzielles Ausfahren der Schubstückzylinder 21 und 11 als auch ein sequenzielles Einfahren der Schubstückzylinder 11 und 21 erzielbar.By such a configuration of a sequential control, both a sequential extension of the thrust cylinder 21 and 11 and a sequential retraction of the thrust cylinder 11 and 21 can be achieved.

Erst wenn der Schubstückzylinder 21 im Wesentlichen vollständig ausgefahren ist, wird das Arbeitsmedium 5 für den Schubstückzylinder 11 freigegeben und erst dann kann dieser Schubstückzylinder 11 ausfahren.Only when the pusher cylinder 21 is substantially fully extended, the working medium 5 is released for the pusher cylinder 11 and only then can this pusher cylinder 11 extend.

Ebenso kann der Schubstückzylinder 21 erst dann einfahren, wenn der Schubstückzylinder 11 im Wesentlichen vollständig eingefahren ist und dabei anschließend das Steuerventil 22 des Schubstückzylinders 21 aufschaltet, wodurch erst der Schubstückzylinder 21 einfahren kann.Likewise, the pusher cylinder 21 can retract only when the pusher cylinder 11 is substantially completely retracted and then the control valve 22 of the pusher cylinder 21 turns on, whereby only the pusher cylinder 21 can retract.

Figur 4 zeigt eine schematische Darstellung für einen hydraulisch betätigbaren Ausleger 100 (siehe Figur 1) für einen Ladekran 101 (siehe Figur 1). In diesem bevorzugten Ausführungsbeispiel weist der hydraulisch betätigbare Ausleger 100 vier Auslegerverlängerungen 1, 2, 3 und 4 (siehe Figur 1) auf, wobei eine Auslegerverlängerung als äußerste Auslegerverlängerung 1 ausgebildet ist und die drei weiteren drei Auslegerverlängerungen 2, 3 und 4 als innere Auslegerverlängerungen 2, 3 und 4 ausgebildet sind. Die Auslegerverlängerungen 1, 2, 3 und 4 weisen jeweils zumindest einen Schubstückzylinder 11, 21, 31 und 41 auf, mit welchen die Auslegerverlängerungen 1, 2, 3 und 4 ein- bzw. ausgefahren werden können. Der hydraulisch betätigbare Ausleger 100 weist dabei einen hydraulischen Kreislauf für ein Arbeitsmedium 5 - in diesem bevorzugten Ausführungsbeispiel Öl - mit einer Einfahrleitung 6 zum druckbeaufschlagten Einfahren der Schubstückzylinder 11, 21, 31 und 41 auf, wobei die Einfahrleitung 6 in den Schubstückzylinder 11 der äußersten Auslegerverlängerung 1 einmündet. Der Ausleger 100 weist weiters eine Ausfahrleitung 7 zum druckbeaufschlagten Ausfahren der Schubstückzylinder 11, 21, 31 und 41 auf. Die Schubstückzylinder 21, 31 und 41 weisen dabei jeweils ein Schaltventil 22, 32 und 42 auf, welches durch Erreichen einer definierten Einfahrposition der nächst außen gelegenen Auslegerverlängerung bzw. dessen Schubstückzylinder 11, 21 und 31 - insbesondere wenn die äußere Auslegerverlängerung 1,2 und 3 bzw. deren Schubstückzylinder 11, 21 und 31 im Wesentlichen voll eingefahren sind - in Offenstellung schaltbar sind und dadurch den nächst inneren Schubstückzylinder 21, 31 bzw. 41 der inneren Auslegerverlängerung 2, 3 bzw. 4 mit druckbeaufschlagtem Arbeitsmedium 5 speisen können. Dabei kommuniziert das Arbeitsmedium 5 der Einfahrleitung 6 zwischen einem nicht dargestellten Tank und der Einmündung 12 am Schubstückzylinder 11 der äußersten Auslegerverlängerung 1 in keiner Stellung der Schubstückzylinder 21, 31 und 41 der inneren Auslegerverlängerungen 2, 3 und 4 mit den Schubstückzylindern 21, 31 und 41 der inneren Auslegerverlängerungen 2, 3 und 4 solange die äußerste Auslegerverlängerung 1 bzw. der Schubstückzylinder 11 nicht ihre/seine Einfahrposition erreicht hat. FIG. 4 shows a schematic representation of a hydraulically actuated boom 100 (see FIG. 1 ) for a loading crane 101 (see FIG. 1 ). In this preferred embodiment, the hydraulically actuatable boom 100 has four boom extensions 1, 2, 3 and 4 (see FIG. 1 ), wherein a boom extension is formed as the outermost boom extension 1 and the three other three boom extensions 2, 3 and 4 are designed as inner boom extensions 2, 3 and 4. The boom extensions 1, 2, 3 and 4 each have at least one thrust cylinder 11, 21, 31 and 41, with which the boom extensions 1, 2, 3 and 4 can be extended or retracted. The hydraulically actuated boom 100 in this case has a hydraulic circuit for a working fluid 5 - in this preferred embodiment oil - with a retraction line 6 for pressurized retraction of the thrust cylinder 11, 21, 31 and 41, wherein the retraction line 6 in the thrust cylinder 11 of the outermost boom extension 1 opens. The boom 100 further has an extension line 7 for the pressurized extension of the thrust cylinder 11, 21, 31 and 41. The pusher cylinders 21, 31 and 41 each have one Switching valve 22, 32 and 42, which by reaching a defined retraction position of the next outer boom extension or its thrust cylinder 11, 21 and 31 - in particular when the outer boom extension 1,2 and 3 or their Schubstückzylinder 11, 21 and 31 substantially are fully retracted - are switchable in the open position and thereby the next inner thrust cylinder 21, 31 and 41 of the inner boom extension 2, 3 and 4 can feed with pressurized working medium 5. In this case, the working medium 5 communicates the Einfahrleitung 6 between a tank, not shown, and the junction 12 on the thrust cylinder 11 of the outermost boom extension 1 in any position of the thrust cylinder 21, 31 and 41 of the inner boom extensions 2, 3 and 4 with the thrust cylinder 21, 31 and 41st the inner boom extensions 2, 3 and 4 as long as the outermost boom extension 1 and the pusher cylinder 11 has not reached his / her entry position.

In diesem bevorzugten Ausführungsbeispiel durchquert die Einfahrleitung 6 alle drei Schubstückzylinder, 21, 31 und 41 der inneren Auslegerverlängerungen 2, 3 und 4 ohne dass dabei das Arbeitsmedium 5 in der Einfahrleitung 6 - während der Durchquerung - mit den Schubstückzylindern 21, 31 und 41 kommuniziert.In this preferred embodiment, the entry line 6 traverses all three thrust cylinder, 21, 31 and 41 of the inner boom extensions 2, 3 and 4 without causing the working fluid 5 in the entrance line 6 - during the crossing - with the thrust cylinder 21, 31 and 41 communicates.

Dabei ist die Einfahrleitung 6 im Inneren der Schubstückzylinder 21, 31, 41 teleskopisch ausgebildet, indem zwei ineinander verschachtelte Rohre 23 und 24 bzw. 33 und 34 bzw. 43 und 44 ausgebildet sind, welche teleskopisch zueinander bewegbar sind.In this case, the entry line 6 is telescopically formed in the interior of the thrust cylinder 21, 31, 41 by two nested tubes 23 and 24 or 33 and 34 or 43 and 44 are formed, which are telescopically movable relative to each other.

Dabei ist jeweils das Rohr 23, 33 bzw. 43 ortsfest im Zylinder des zugehörigen Schubstückzylinders 21, 31 bzw. 41 ausgebildet und das zweite Rohr 24, 34 bzw. 44 ist dabei ortsfest in der zugehörigen Kolbenstange des zugehörigen Schubstückzylinders 21, 31 bzw. 41 ausgebildet.In each case, the tube 23, 33 and 43 fixed in the cylinder of the associated thrust cylinder 21, 31 and 41 is formed and the second tube 24, 34 and 44 is stationary in the associated piston rod of the associated thrust cylinder 21, 31 and 41st educated.

In diesem bevorzugten Ausführungsbeispiel weist jeweils das äußere Rohr 23, 33 bzw. 43 eine Ausnehmung 29, 39 bzw. 49 in der Mantelfläche des zugehörigen Rohres auf, wobei diese Ausnehmungen 29. 39 bzw. 49 an einem Endbereich des Rohres 23, 33 bzw. 43 ausgebildet sind. 'In this preferred embodiment, each of the outer tube 23, 33 and 43 has a recess 29, 39 and 49 in the lateral surface of the associated tube, said recesses 29. 39 and 49 at an end portion of the tube 23, 33 and 43 are formed. '

Das Schaltventil 22, 32 und 42 ist in diesem bevorzugten Ausführungsbeispiel als 2/2 Wegeventil ausgebildet und wird mechanisch über die Hebel 51, 52 bzw. 53 betätigt.The switching valve 22, 32 and 42 is formed in this preferred embodiment as a 2/2 way valve and is operated mechanically via the levers 51, 52 and 53, respectively.

Die Aus- bzw. Einfahrbewegung dieser vier dargestellten Schubstückzylinder 11, 21, 31 und 41 funktioniert sinngemäß gleich wie in der Figurenbeschreibung der Figuren 2 und 3 geschildert.The extension or retraction movement of these four illustrated thrust cylinder 11, 21, 31 and 41 works analogously as in the figure description of Figures 2 and 3 portrayed.

Sowohl das Ausfahren als auch das Einfahren erfolgt sequenziell, das heißt, dass immer nur ein Schubstückzylinder 11, 21, 31 oder 41 aus-bzw. einfährt. Dazu wird das Arbeitsmedium 5 immer nur nach im Wesentlichen vollkommen erfolgtem Ausfahren bzw. Einfahren für den nächst außen gelegenen Schubstückzylinder 31, 21 und 11 bzw. für den nächst innen gelegenen Schubstückzylinder 21, 31 und 41 frei geschalten.Both the extension and the retraction are sequential, that is, that only one thrust cylinder 11, 21, 31 or 41 off or. retracts. For this purpose, the working medium 5 is always released only after essentially complete extension or retraction for the next outer thrust piece cylinder 31, 21 and 11 or for the next inside thrust piece cylinder 21, 31 and 41.

Figur 5 zeigt eine Detaildarstellung eines Schnittes durch einen Schubstückzylinder 21 in einer Position wie in Figur 3 dargestellt, wenn dieser im Wesentlichen voll ausgefahren ist. FIG. 5 shows a detailed view of a section through a pusher cylinder 21 in a position as in FIG. 3 shown when this is substantially fully extended.

Im Inneren des Schubstückzylinders 21 verlaufen die beiden teleskopisch ausgebildeten Rohre 23 und 24. Dabei verlaufen diese beiden Rohre 23 und 24 auch quer durch den Zylinder 26, den Kolben 27 und die Kolbenstange 28. Diese im Schubstückzylinder 21 angeordnete, teleskopierbare Leitung 6 - bestehend aus den beiden Rohren 23 und 24 - ermöglichst es, dass für das Einfahren erforderliche Öl 5 durch den Schubstückzylinder 21 (und 31 und 41 wie in Figur 4 dargestellt) nach vorne zu den Schubstückzylinder 11 zu führen, wobei in diesem bevorzugten Ausführungsbeispiel das hintere, mit dem Zylinder 26 verbundene größere Rohr 23 verbunden ist und das kleinere Rohr 24 mit der Kolbenstange 28 verbunden ist, wobei das kleinere Rohr 24 in das größere Rohr 23 hineinragt und in diesem dicht geführt ist. Diese Leitung 6 ermöglicht es, dem vordersten noch nicht eingefahrenen Schubstückzylinder 11 (siehe Figur 3) einfahrseitig Öl zuzuführen, bis dieser ganz eingefahren ist. In diesem Zustand wird das Steuerventil 22 (siehe Figur 3) zum nächst dahinterliegenden Schubstückzylinder 21 betätigt (geöffnet). Daraufhin kann dieser Schubstückzylinder 21 einfahren. Dieser Vorgang wird solange nacheinander durchgeführt, bis alle Schubstückzylinder (21, 31, 41 sieh Figur 4) vollständig eingefahren sind.In the interior of the thrust cylinder 21 extend the two telescopically formed tubes 23 and 24. In this case, these two tubes 23 and 24 extend transversely through the cylinder 26, the piston 27 and the piston rod 28. This arranged in the thrust cylinder 21, telescopic line 6 - consisting of the two tubes 23 and 24 - makes it possible that required for retraction oil 5 through the thrust cylinder 21 (and 31 and 41 as in FIG. 4 shown) to lead forward to the thrust cylinder 11, wherein in this preferred embodiment, the rear, connected to the cylinder 26 larger tube 23 is connected and the smaller tube 24 is connected to the piston rod 28, wherein the smaller tube 24 into the larger tube 23 protrudes and is tightly guided in this. This line 6 makes it possible, the foremost not yet retracted thrust cylinder 11 (see FIG. 3 ) to supply oil on the driving side until it has retracted completely. In this state, the control valve 22 (see FIG. 3 ) is actuated (opened) to the nearest pusher cylinder 21 located behind. Then this thrust cylinder 21 can retract. This process will be consecutive performed until all thrust cylinder (21, 31, 41 see FIG. 4 ) are completely retracted.

Diese Art der Steuerung hat gegenüber der bisherigen den Vorteil, dass die Steuerreihenfolge zu keinem Zeitpunkt durch Absperren des Rückölflusses bestimmt wird, sondern immer durch gesteuerte Olzuführung. Der Rückölfluss ist sowohl beim Einfahren als auch beim Ausfahren immer frei.This type of control has over the previous advantage that the control order is determined at any time by blocking the return oil flow, but always by controlled oil supply. The return oil flow is always free both when entering and during extension.

Das größere hinten liegende Rohr 23 ist im Kolben 27 dicht geführt und hat am vorderen Ende nach der Dichtung bzw. Führung eine Verlängerung mit radial angeordneten Öffnungen 29, die den Durchfluss des kolbenseitigen Öles durch den Kolben 27 und die Kolbenstange 28 nach vorne im ausgefahrenen Zustand freigebenThe larger rear tube 23 is tightly guided in the piston 27 and has at the front end to the seal or guide an extension with radially arranged openings 29, the flow of the piston-side oil through the piston 27 and the piston rod 28 forward in the extended state release

Der Kolben 27 weist dabei ein Rückschlagventil (273, siehe Figur 3) auf, das gegebenenfalls bei geringfügig eingefahrenem Kolben 27 bei Druckbeaufschlagung durch den Rückölfluss von der Stangenseite her öffnet und den Durchfluss nach hinten frei gibt.The piston 27 has a check valve (273, see FIG. 3 ), which optionally opens at slightly retracted piston 27 when pressurized by the return oil flow from the rod side and releases the flow to the rear.

Figur 6 zeigt ein Fahrzeug 200 mit einem darauf montiertem Ladekran 101 mit einem hydraulisch betätigbaren Ausleger 100 mit Auslegerverlängerungen. FIG. 6 shows a vehicle 200 with a loading crane 101 mounted thereon with a hydraulically actuatable boom 100 with boom extensions.

Claims (15)

  1. A hydraulically actuable jib (100) for a loading crane (101), comprising:
    - at least two jib extensions (1, 2), wherein the one jib extension is in the form of an outer jib extension (1) and the second jib extension is in the form of an inner jib extension (2), and
    - at least two thrust cylinders (11, 21) for extension and retraction of the at least two jib extensions (1, 2),
    - a hydraulic circuit for a working medium (5) - in particular oil - comprising a retraction line (6) for pressure-actuated retraction of the thrust cylinders (11, 21), wherein the retraction line (6) opens into the one thrust cylinder (11) of the outer jib extension (1) and is at least formed in the interior of the other thrust cylinder (21) of the inner jib extension (2), and
    - a tank for delivery of the working medium (5), and
    - a switching valve (22) which is switchable into the open position by the attainment of a defined retraction position of the outer jib extension (1) - in particular when the outer jib extension (1) is substantially fully retracted - and thereby feeds the other thrust cylinder (21) of the inner jib extension (2) with pressurized working medium (5),
    characterised in that the retraction line (6) is adapted to be telescopic in the interior of the other thrust cylinder (21) of the inner jib extension (2) and the working medium (5) of the retraction line (6) between the tank and the inlet opening (12) at the one thrust cylinder (11) of the outer jib extension (1) does not communicate with the other thrust cylinder (21) of the inner jib extension (2) in any position of the other thrust cylinder (21) of the inner jib extension (2) as long as the outer jib extension (1) has not reached its retraction position, wherein the working medium (5) flows back in every position of the other thrust cylinder (21) through the same independently of the position of the other thrust cylinder (21) as long as the outer jib extension (1) has not reached its retraction position and switches the switching valve (22) in the open position.
  2. A jib as set forth in claim 1 characterised in that the retraction line (6) passes through at least the other thrust cylinder (21) of the inner jib extension (2) without the working medium (5) in the retraction line (6) communicating with the working medium (5) flowing back in the other thrust cylinder (21) during the passage therethrough.
  3. A jib as set forth in claim 1 or claim 2 characterised in that the retraction line (6) has at least two internested tubes (23, 24) which are adapted to be telescopically moveable relative to each other.
  4. A jib as set forth in claim 3 characterised in that a seal (25) is provided between the two interested tubes (23, 24).
  5. A jib as set forth in claim 3 or claim 4 characterised in that the other thrust cylinder (21) of the inner jib extension (2) has at least one cylinder (26), at least one piston (27) and at least one piston rod (28) wherein one (23) of the two tubes (23, 24) is provided stationarily in the cylinder (26) of the other thrust cylinder (21) and the second tube (24) is provided stationarily in the piston rod (28) of the other thrust cylinder (21).
  6. A jib as set forth in one of claims 3 through 5 characterised in that the outer one (23) of the two tubes (23, 24) has an opening (29) in a peripheral surface of the tube (23), the opening (29) being provided at an end region of the tube (23).
  7. A jib as set forth in one of claims 1 through 6 characterised in that the piston (27) has at least one extension passage (271), the extension passage (271) extending from a cylinder chamber (261) into a piston rod chamber (281).
  8. A jib as set forth in one of claims 1 through 7 characterised in that the piston (27) has at least one retraction passage (272), the retraction passage (272) extending from the cylinder chamber (261) into the piston rod chamber (281), a check valve (273) being provided in the retraction passage (272).
  9. A jib as set forth in one of claims 1 through 8 characterised in that the piston rod (28) has at least one piston rod passage (282), the piston rod passage (282) extending from an end region of the piston rod (28) towards the other end region of the piston rod (28), the switching valve (22) being arranged at the one end region and a chamber (262) surrounding the piston rod (28) being provided at the other end region, the chamber (262) which surrounds the piston rod (28) being provided in the cylinder (26) of the other thrust cylinder (21).
  10. A jib as set forth in one of claims 1 through 9 characterised in that at least one check valve (283) is provided at the piston rod passage (282).
  11. A jib as set forth in one of claims 1 through 10 characterised in that the switching valve (22) is in the form of a directional control valve - preferably a 2/2-way valve.
  12. A jib as set forth in one of claims 1 through 11 characterised in that the switching valve (22) is adapted to be mechanically actuable.
  13. A jib as set forth in one of claims 1 through 12 characterised in that the jib (100) has at least one - preferably at least two - further inner jib extension(s) (3, 4) with a thrust cylinder or cylinders (31, 41), wherein the working medium (5) of the retraction line (6) between the tank and the inlet opening (12) at the thrust cylinder (11) of the outermost jib extension (1) does not communicate with the thrust cylinders (21, 31, 41) of the inner jib extensions (2, 3, 4) in any position of the thrust cylinders (21, 31, 41) of the inner jib extensions (2, 3, 4) as long as the outermost jib extension (1) has not reached its retraction position.
  14. A loading crane (101) comprising a hydraulically actuable jib (100) as set forth in one of claims 1 through 13.
  15. A vehicle (200) comprising a loading crane (101) as set forth in claim 14.
EP12712877.5A 2011-03-10 2012-03-09 Boom of a loading crane Active EP2683645B1 (en)

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ATGM133/2011U AT12645U1 (en) 2011-03-10 2011-03-10 CRANE BOOM
PCT/AT2012/000056 WO2012119169A1 (en) 2011-03-10 2012-03-09 Loading crane jib

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US9718655B2 (en) 2017-08-01
PL2683645T3 (en) 2014-11-28
RU2013145351A (en) 2015-04-20
BR112013022490A2 (en) 2016-12-06
AU2012225180A1 (en) 2013-09-12
DK2683645T3 (en) 2014-09-15
WO2012119169A1 (en) 2012-09-13
CN103429522B (en) 2015-10-21
CN103429522A (en) 2013-12-04
AT12645U1 (en) 2012-09-15
RU2610898C2 (en) 2017-02-17
EP2683645A1 (en) 2014-01-15
US20140001140A1 (en) 2014-01-02
ES2498951T3 (en) 2014-09-26
AU2012225180B2 (en) 2017-05-18

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