EP0562096A1 - Loading crane. - Google Patents

Loading crane.

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Publication number
EP0562096A1
EP0562096A1 EP92922106A EP92922106A EP0562096A1 EP 0562096 A1 EP0562096 A1 EP 0562096A1 EP 92922106 A EP92922106 A EP 92922106A EP 92922106 A EP92922106 A EP 92922106A EP 0562096 A1 EP0562096 A1 EP 0562096A1
Authority
EP
European Patent Office
Prior art keywords
arm
valve
hydraulic
cylinder
extended
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92922106A
Other languages
German (de)
French (fr)
Other versions
EP0562096B1 (en
Inventor
Franz Sieberer
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
Original Assignee
Palfinger AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Palfinger AG filed Critical Palfinger AG
Publication of EP0562096A1 publication Critical patent/EP0562096A1/en
Application granted granted Critical
Publication of EP0562096B1 publication Critical patent/EP0562096B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B66C23/54—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
    • 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
    • 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

Definitions

  • the invention relates to a loading crane which can be attached to a truck and has a boom which consists of a plurality of arms which are arranged telescopically one inside the other, a hydraulic unit consisting of a piston and cylinder being arranged between successive arms and an arm being pushed out when the arm is pushed out A stop arranged on the preceding arm actuates a valve which is moved along with the extended arm and which releases the hydraulic supply for the following arm.
  • Sequence controls for loading cranes have the purpose of ensuring that the individual arms of a telescopic boom are extended or retracted in a specific, usually rigidly defined sequence. This is achieved either by an electrohydraulic control device (cf. DE-PS 26 48 608) or by avoiding electrical components with considerable mechanical outlay (cf. DE-OS 34 13 443).
  • the loading cranes previously used by Palfinger Aktiengesellschaft are equipped with a mechanically simple sequence control of the type defined at the outset, which has the disadvantage, however, that only that arm of the telescope which is supported directly on the articulated arm surrounding it , is forced to extend first.
  • the other parts of the telescopic thrust arm are not fixed with regard to the order in which they are extended.
  • the valve which is actuated by the stop arranged on the articulated arm, is located on the piston side facing the articulated arm End of the hydraulic cylinder that operates the first arm. Only when this first arm is fully extended does the valve designed as a check valve release the flow of the hydraulic fluid to the cylinders of the further telescopic arms.
  • the object of the invention is to design a device of the type outlined at the outset in such a way that it becomes suitable for the sequential control of a plurality of telescopic arms.
  • the multiple use of the previously used device would not be suitable for solving this problem because, in addition to a plurality of hydraulic units, valves and stops on the outside of the articulated arm, the stop-actuated valve leading to the hydraulic unit supplied by this unit no longer existed are to be accommodated.
  • the invention makes these pipelines superfluous by arranging the valve, which releases the oil supply to the following arm after an arm has been pushed out, not on the extended arm, but on the following arm.
  • valve is arranged at the closed end of the hydraulic cylinder of the arm following the extended arm.
  • the invention not only enables the avoidance of disruptive pipelines, but also a very compact construction of the valves which are practically integrated into the bottom of the hydraulic unit.
  • the valve is a spring-loaded slide valve flanged directly onto the cylinder, the slide rod of which cooperates with the stop.
  • the stop-controlled valve is a simple check valve. This means that the first telescopic arm necessarily extends first, but not that it retracts last.
  • the piston of the corresponding hydraulic unit With a mandrel which, when the piston is completely retracted, presses on a non-return valve connected to the bottom of the hydraulic unit.
  • the invention makes it possible to combine both measures with one another and thus to achieve a simple sequential control for the retraction and extension of a plurality of telescopic arms, in that the valve is a shut-off valve to which a check valve is connected in parallel, which in on is known to open with the piston fully inserted.
  • FIG. 1 shows the schematic representation of a conventional loading crane
  • FIG. 2 shows a circuit diagram of a sequence control according to the invention
  • FIGS. 3 and 4 show longitudinal sections through the end region of hydraulic units designed according to the invention with the valve open or closed.
  • the invention relates to a sequence control for extending and retracting the arms 11, 12, 13, 14, which is connected to the articulated arm 7 or to one another by a series of hydraulic units 16, 17, 18, 19 (partly not visible) are.
  • a valve 10 is arranged on the open side of the cylinder of the hydraulic unit 16, which connects the articulated arm 7 to the extendable arm 11. This only releases the supply of hydraulic fluid to the hydraulic unit 17, which is not visible in the drawing and which connects the arms 11 and 12, when it strikes the stop 21 which is connected to the articulated arm 7.
  • FIG. 3 and 4 an embodiment for the construction of a slide valve 32 arranged according to the invention is shown.
  • the slide rod 321 In the open position of the valve shown in FIG. 3, the slide rod 321 is pushed in against the action of the spring 322 by the stop 21 arranged on the articulated arm 7.
  • the hydraulic fluid supplied via the line 37 passes unhindered Cylinder chamber 172.
  • a further flow through the pipe 177 arranged in the interior of the piston 171 through the openings 175 is only possible if the valve 32 'is also open. However, this presupposes that the piston 171 is shifted completely to the right from the position shown.
  • the line 50 shown in FIG. 2 opens at the right end of the hydraulic unit 17 into the space 176 in the piston 171 surrounding the line 174 and only arrives from there into the space 173 surrounding the piston 171.
  • valve 32 closes the flow through the bores 323 and 324.
  • hydraulic fluid can only flow out through the pipe 174 if the mandrel 174 has opened the check valve 38 when the piston has opened 171 is therefore in its extreme left position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jib Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

PCT No. PCT/AT92/00128 Sec. 371 Date Jun. 4, 1993 Sec. 102(e) Date Jun. 4, 1993 PCT Filed Oct. 21, 1992 PCT Pub. No. WO93/08116 PCT Pub. Date Apr. 29, 1993.A loading crane that can be mounted on a lorry has a jib composed of several arms telescopically nested into each other. A hydraulic unit composed of piston and cylinder is arranged between successive arms. When an arm is extended, a stop arranged on the previous arm actuates a valve entrained with the extended arm, which opens a hydraulic supply for the arm that follows the extended arm. Such valve is arranged at the closed end of a hydraulic cylinder of the arm that follows the extended arm.

Description

Ladekran Loading crane
Die Erfindung bezieht sich auf einen an einem Last¬ fahrzeug anbringbaren Ladekran mit einem Ausleger, welcher aus mehreren teleskopartig ineinander ange¬ ordneten Armen besteht, wobei zwischen aufeinander¬ folgenden Armen je eine aus Kolben und Zylinder bestehende Hydraulikeinheit angeordnet ist und beim Ausschieben eines Armes ein am vorhergehenden Arm ange- ordneter Anschlag ein mit dem ausgeschobenen Arm mitbe¬ wegtes Ventil betätigt, welches die Hydraulikzufuhr für den nachfolgenden Arm freigibt.The invention relates to a loading crane which can be attached to a truck and has a boom which consists of a plurality of arms which are arranged telescopically one inside the other, a hydraulic unit consisting of a piston and cylinder being arranged between successive arms and an arm being pushed out when the arm is pushed out A stop arranged on the preceding arm actuates a valve which is moved along with the extended arm and which releases the hydraulic supply for the following arm.
Folgesteuerungen für Ladekräne haben den Zweck, sicher- zustellen, daß die einzelnen Arme eines Teles¬ kopauslegers in einer bestimmten, meist starr fest¬ gelegten Reihenfolge aus- bzw. eingefahren werden. Dies wird entweder durch eine elektrohydraulische Steuer¬ vorrichtung (vgl. DE-PS 26 48 608) oder unter Ver- meidung elektrischer Bauteile mit erheblichem mechani¬ schen Aufwand (vgl. DE-OS 34 13 443) erreicht. Dem¬ gegenüber sind die von der Firma Palfinger Aktien¬ gesellschaft vorbenützten Ladekräne mit einer mecha¬ nisch einfachen Folgesteuerung der eingangs definierten Art ausgestattet, welche jedoch den Nachteil hat, daß lediglich jener Arm des Teleskops, welcher sich unmit¬ telbar am ihn umgebenden Knickarm abstützt, zwangsweise zuerst ausgefahren wird. Die übrigen Teile des teles¬ kopartig aufgebauten Schubarmes sind hingegen hinsicht- lieh der Reihenfolge des Ausschiebens nicht festgelegt.Sequence controls for loading cranes have the purpose of ensuring that the individual arms of a telescopic boom are extended or retracted in a specific, usually rigidly defined sequence. This is achieved either by an electrohydraulic control device (cf. DE-PS 26 48 608) or by avoiding electrical components with considerable mechanical outlay (cf. DE-OS 34 13 443). In contrast, the loading cranes previously used by Palfinger Aktiengesellschaft are equipped with a mechanically simple sequence control of the type defined at the outset, which has the disadvantage, however, that only that arm of the telescope which is supported directly on the articulated arm surrounding it , is forced to extend first. The other parts of the telescopic thrust arm, on the other hand, are not fixed with regard to the order in which they are extended.
Bei den offenkundig vorbenutzten Kränen der Palfinger Aktiengesellschaft befindet sich das Ventil, welches durch den am Knickarm angeordneten Anschlag betätigt wird, an dem zum Knickarm gerichteten kolbenseitigen Ende des Hydraulikzylinders, welcher den ersten Arm betätigt. Erst wenn dieser erste Arm völlig ausgefahren ist, gibt das als Rückschlagventil ausgebildete Ventil den Durchfluß der Hydraulikflüssigkeit zu den Zylindern der weiteren Teleskoparme frei.In the obviously used cranes from Palfinger Aktiengesellschaft, the valve, which is actuated by the stop arranged on the articulated arm, is located on the piston side facing the articulated arm End of the hydraulic cylinder that operates the first arm. Only when this first arm is fully extended does the valve designed as a check valve release the flow of the hydraulic fluid to the cylinders of the further telescopic arms.
Aufgabe der Erfindung ist es, eine Einrichtung der ein¬ gangs skizzierten Art so auszugestalten, daß sie für die Folgesteuerung mehrerer Teleskoparme tauglich wird. Lediglich die mehrfache Anwendung der vorbenützten Ein¬ richtung wäre zur Lösung dieser Aufgabe deshalb nicht geeignet, weil von dem anschlagbetätigten Ventil zur von diesem versorgten Hydraulikeinheit führende Leitun¬ gen neben einer Mehrzahl von Hydraulikeinheiten, Venti- len und Anschlägen an der Außenseite des Knickarmes nicht mehr unterzubringen sind. Die Erfindung macht diese Rohrleitungen überflüssig, indem sie das Ventil, welches nach dem Ausschieben eines Armes die ölzufuhr zum folgenden Arm freigibt, nicht am ausgeschobenen Arm, sondern am darauf folgenden Arm anordnet.The object of the invention is to design a device of the type outlined at the outset in such a way that it becomes suitable for the sequential control of a plurality of telescopic arms. Merely the multiple use of the previously used device would not be suitable for solving this problem because, in addition to a plurality of hydraulic units, valves and stops on the outside of the articulated arm, the stop-actuated valve leading to the hydraulic unit supplied by this unit no longer existed are to be accommodated. The invention makes these pipelines superfluous by arranging the valve, which releases the oil supply to the following arm after an arm has been pushed out, not on the extended arm, but on the following arm.
Erfindungsgemäß ist also vorgesehen, daß das Ventil am geschlossenen Ende des Hydraulikzylinders des auf den ausgeschobenen Arm folgenden Armes angeordnet ist.According to the invention it is therefore provided that the valve is arranged at the closed end of the hydraulic cylinder of the arm following the extended arm.
Die Erfindung ermöglicht nicht nur die Vermeidung störender Rohrleitungen, sondern überhaupt einen sehr kompakten Aufbau der praktisch in den Boden der Hydrau¬ likeinheit integrierten Ventile. Wie anhand des Aus- fUhrungsbeispiels näher erläutert werden soll, ist in diesem Sinne vorzugsweise vorgesehen, daß das Ventil ein unmittelbar an den Zylinder angeflanschtes feder¬ beaufschlagtes Schiebeventil ist, dessen Schieberstange mit dem Anschlag zusammenwirkt. Nach dem vorveröffentlichten Stand der Technik ist das anschlaggesteuerte Ventil ein einfaches Rückschlag¬ ventil. Damit läßt sich zwar erreichen, daß der erste Teleskoparm notwendigerweise zuerst ausfährt, nicht aber daß er zuletzt einfährt. Um sicherzustellen, daß der erste Teleskoparm zuletzt einfährt, ist es an sich bereits bekannt, den Kolben der entsprechenden Hydrau¬ likeinheit mit einem Dorn zu versehen, der beim völli¬ gen Einfahren des Kolbens ein an den Boden der Hydrau- likeinheit anschließendes Rückschlagventil aufdrückt. Die Erfindung ermöglicht es, beide Maßnahmen miteinan¬ der zu kombinieren und damit zu einer einfachen Folge¬ steuerung für das Einfahren und das Ausfahren auch mehrerer Teleskoparme zu kommen, indem das Ventil ein Absperrventil ist, zu dem ein Rückschlagventil parallel geschaltet ist, welches in an sich bekannter Weise bei völlig eingeschobenem Kolben geöffnet ist.The invention not only enables the avoidance of disruptive pipelines, but also a very compact construction of the valves which are practically integrated into the bottom of the hydraulic unit. As will be explained in more detail with reference to the exemplary embodiment, it is preferably provided in this sense that the valve is a spring-loaded slide valve flanged directly onto the cylinder, the slide rod of which cooperates with the stop. According to the previously published state of the art, the stop-controlled valve is a simple check valve. This means that the first telescopic arm necessarily extends first, but not that it retracts last. In order to ensure that the first telescopic arm moves in last, it is known per se to provide the piston of the corresponding hydraulic unit with a mandrel which, when the piston is completely retracted, presses on a non-return valve connected to the bottom of the hydraulic unit. The invention makes it possible to combine both measures with one another and thus to achieve a simple sequential control for the retraction and extension of a plurality of telescopic arms, in that the valve is a shut-off valve to which a check valve is connected in parallel, which in on is known to open with the piston fully inserted.
Einzelheiten der Erfindung werden anschließend anhand der Zeichnung erläutert. In dieser istDetails of the invention are subsequently explained with reference to the drawing. In this is
Fig. 1 die schematische Darstellung eines konventio¬ nellen Ladekrans, Fig. 2 ein Schaltplan einer erfin¬ dungsgemäßen Folgesteuerung und Fig. 3 und 4 Längs- schnitte durch den Endbereich erfindungsgemäß ausge¬ bildeter Hydraulikeinheiten bei geöffnetem bzw. geschlossenem Ventil.1 shows the schematic representation of a conventional loading crane, FIG. 2 shows a circuit diagram of a sequence control according to the invention, and FIGS. 3 and 4 show longitudinal sections through the end region of hydraulic units designed according to the invention with the valve open or closed.
Der in Fig. 1 dargestellte, dem Stand der Technik ent- sprechende Ladekran weist einen auf einem Sockel 8 um eine vertikale Achse drehbaren Ständer 3 auf. An diesem Ständer 3 ist mittels eines Hubzylinders 1 ein Hubarm 5 um eine horizontale Achse 4 schwenkbar gelagert. Um eine weitere horizontale Achse 9 ist ein sogenannter Knickarm 7 unter Vermittlung der Hydraulikeinheit 6 und des Kniehebels 2 schwenkbar. Der Knickarm 7 bildet mit einer Serie von teleskopartig darin angeordneten Armen 11 - 14, die insgesamt als Schubarm bezeichnet werden, einen Ausleger-.The loading crane shown in FIG. 1 and corresponding to the prior art has a stand 3 which can be rotated about a vertical axis on a base 8. On this stand 3, a lifting arm 5 is pivotally mounted about a horizontal axis 4 by means of a lifting cylinder 1. About a further horizontal axis 9 is a so-called articulated arm 7 with the intermediation of the hydraulic unit 6 and the toggle lever 2 swiveling. The articulated arm 7 forms a cantilever arm with a series of arms 11 - 14 arranged telescopically therein, which are referred to collectively as a push arm.
Die Erfindung betrifft eine Folgesteuerung für das Aus- und Einfahren der Arme 11,12,13,14, welche mit dem Knickarm 7 bzw. untereinander durch eine Reihe von Hydraulikeinheiten 16,17,18,19 (zum Teil nicht sieht- bar) verbunden sind. Bei der in Fig. 1 dargestellten vorbenützten Ausführung eines Krans ist lediglich das Ausfahren des Armes 11 vor jenem der Arme 12 - 14 sichergestellt. Hiezu ist an der offenen Seite des Zylinders der Hydraulikeinheit 16, welche den Knickarm 7 mit dem ausschiebbaren Arm 11 verbindet, ein Ventil 10 angeordnet. Dieses gibt die Zufuhr von Druckflüssig¬ keit zu der in der Zeichnung nicht sichtbaren Hydrau¬ likeinheit 17, welche die Arme 11 und 12 verbindet, erst frei, wenn es am Anschlag 21 anschlägt, welcher mit dem Knickarm 7 verbunden ist.The invention relates to a sequence control for extending and retracting the arms 11, 12, 13, 14, which is connected to the articulated arm 7 or to one another by a series of hydraulic units 16, 17, 18, 19 (partly not visible) are. In the previously used embodiment of a crane shown in FIG. 1, only the extension of the arm 11 in front of that of the arms 12-14 is ensured. For this purpose, a valve 10 is arranged on the open side of the cylinder of the hydraulic unit 16, which connects the articulated arm 7 to the extendable arm 11. This only releases the supply of hydraulic fluid to the hydraulic unit 17, which is not visible in the drawing and which connects the arms 11 and 12, when it strikes the stop 21 which is connected to the articulated arm 7.
Erfindungsgemäß ist das Ventil 10 nicht, wie in Fig. 1 dargestellt, mit dem Zylinder der Hydrauiikeinheit 16 verbunden r welche zum Ausschieben des Armes 11 aus dem Klickarm 7 dient. Der Anschlag 21 am Knickarm 7 ragt gemäß der Erfindung vielmehr in den Weg eines Ventils 32, welches am geschlossenen Ende des Zylinders der Hydraulikeinheit 17 angeordnet ist. In analoger Weise stößt beim Ausschieben des Armes 12 durch die Hydrau- likeinheit 17 das Ventil 32', welches mit der Hydrau¬ likeinheit 18 zum Ausschieben des Armes 13 verbunden ist, gegen einen mit dem Arm 11 fest verbundenen Anschlag 22. Dieser Anschlag 22 kann beispielsweise seitlich vom Boden des Zylinders der Hydraulikeinheit 16 abstehen. Der das Ventil 32" der zum Ausschieben des Armes 14 dienenden Hydraulikeinheit 19 betätigende Anschlag 23 befindet sich in analoger Weise auf einem mit dem Arm 12 fest verbundenen Teil beispielsweise am offenen Ende des Zylinders der Hydraulikeinheit 17.According to the invention the valve 10 is not, as shown in Fig. 1 connected to the cylinder of the Hydrauiikeinheit 16 r which for pushing out the arm 11 from the Klickarm 7 is used. Rather, the stop 21 on the articulated arm 7 projects into the path of a valve 32, which is arranged at the closed end of the cylinder of the hydraulic unit 17. In an analogous manner, when the arm 12 is pushed out by the hydraulic unit 17, the valve 32 ', which is connected to the hydraulic unit 18 for pushing out the arm 13, abuts against a stop 22 which is firmly connected to the arm 11. This stop 22 can protrude laterally from the bottom of the cylinder of the hydraulic unit 16, for example. The valve 32 "to push the Arm 23 serving hydraulic unit 19 actuating stop 23 is located in an analogous manner on a part firmly connected to arm 12, for example at the open end of the cylinder of hydraulic unit 17.
Aus Fig. 2 ergibt sich die Funktion einer in der beschriebenen Weise aufgebauten Einrichtung. Beim Aus¬ schieben des Auslegers gelangt Hydraulikflüssigkeit über das Rückschlagventil 35 durch die hohle Kolben- Stange 161 der Hydraulikeinrichtung 16 in den Zylinder¬ raum 162. Dadurch wird der Zylinder der Hydraulikein¬ heit 16 nach rechts ausgeschoben, da die Hydraulik¬ flüssigkeit über die Leitung 37 nicht abströmen kann, solange die Ventile 32 und 38 geschlossen sind. Erst wenn die Hydraulikeinheit 16 den Arm 11 ganz ausge¬ fahren hat, sodaß das Ventil 32 gegen den Anschlag 21 am Knickarm 7 gedrückt und damit geöffnet worden ist, gelangt Hydraulikflüssigkeit in den Zylinderraum 172 der Hydraulikeinheit 17 und es kommt zum Ausschieben des Armes 12. In analoger Weise werden die Arme 13 und 14 nach dem Arm 12 ausgeschoben.2 shows the function of a device constructed in the manner described. When the boom is pushed out, hydraulic fluid passes through the check valve 35 through the hollow piston rod 161 of the hydraulic device 16 into the cylinder space 162. As a result, the cylinder of the hydraulic unit 16 is pushed out to the right, since the hydraulic fluid flows through the line 37 can not flow out as long as the valves 32 and 38 are closed. Only when the hydraulic unit 16 has fully extended the arm 11, so that the valve 32 has been pressed against the stop 21 on the articulated arm 7 and has thus been opened, does hydraulic fluid enter the cylinder space 172 of the hydraulic unit 17 and the arm 12 is pushed out. In an analogous manner, the arms 13 and 14 are pushed out after the arm 12.
Beim Einschieben des beschriebenen Teleskoparmes wird Hyraulikflüssigkeit über die Leitung 40 in den die Kolbenstange 161 der Hydraulikeinheit 16 umgebendenWhen the telescopic arm described is inserted, hydraulic fluid is fed via line 40 into the piston rod 161 of the hydraulic unit 16 surrounding it
Raum 163 geleitet. Dies bewirkt jedoch noch nichts, bis die Hydraulikflüssigkeit nacheinander durch die Leitungsabschnitte 50,50',50" in die die Kolbenstangen der Hydraulikeinheiten 17,18,19 umgebenden Räume 173,183,193 gelangt ist und die Kolbenstange 191 nach links verschoben hat, was unter Öffnung des Rück¬ schlagventils 42 möglich ist. Wenn die Kolbenstange 191 und der damit verbundene Arm 14 gänzlich eingefahren sind, öffnet der Dorn 194 am Boden der Kolbenstange 191 das Ventil 38" und überbrückt damit das Ventil 32", sodaß nunmehr Hydraulikflüssigkeit aus dem Zylinderraum 182 der Hydraulikeinheit 18 abfließen kann. An¬ schließend öffnet der Dorn 184 am Ende des Kolbens 181 das Ventil 38' , wo sich der geschilderte Vorgang in analoger Weise wiederholt.Room 163 directed. However, this does not have any effect until the hydraulic fluid has successively entered the spaces 173, 183, 193 surrounding the piston rods of the hydraulic units 17, 18, 19 through the line sections 50, 50 ', 50 "and has displaced the piston rod 191 to the left, which results in the opening of the rear ¬ impact valve 42 is possible. When the piston rod 191 and the arm 14 connected thereto are completely retracted, the mandrel 194 at the bottom of the piston rod 191 opens the valve 38 "and thus bridges the valve 32", so that hydraulic fluid can now flow out of the cylinder space 182 of the hydraulic unit 18. The mandrel 184 then opens the valve 38 'at the end of the piston 181, where the process described is repeated in an analogous manner.
In Fig. 3 und 4 ist ein Ausführungsbeispiel für die Konstruktion eines erfindungsgemäß angeordneten Schieberventils 32 gezeigt. Bei der in Fig. 3 darge- stellten offenen Stellung des Ventils ist die Schieber¬ stange 321 durch den am Knickarm 7 angeordneten Anschlag 21 gegen die Wirkung der Feder 322 einge¬ schoben, Die über die Leitung 37 zugeführte Hydraulik¬ flüssigkeit gelangt ungehindert in den Zylinderraum 172. Ein Weiterfließen durch das im Inneren des Kolbens 171 angeordnete Rohr 177 durch die Öffnungen 175 ist nur möglich, wenn auch das Ventil 32' offen ist. Dies setzt jedoch voraus, daß der Kolben 171 aus der darge¬ stellten Lage ganz nach rechts verschoben wird.3 and 4, an embodiment for the construction of a slide valve 32 arranged according to the invention is shown. In the open position of the valve shown in FIG. 3, the slide rod 321 is pushed in against the action of the spring 322 by the stop 21 arranged on the articulated arm 7. The hydraulic fluid supplied via the line 37 passes unhindered Cylinder chamber 172. A further flow through the pipe 177 arranged in the interior of the piston 171 through the openings 175 is only possible if the valve 32 'is also open. However, this presupposes that the piston 171 is shifted completely to the right from the position shown.
Die in Fig. 2 dargestellte Leitung 50 mündet am rechten Ende der Hydraulikeinheit 17 in den die Leitung 174 umgebenden Raum 176 im Kolben 171 und gelangt erst von dort in den den Kolben 171 umgebenden Raum 173.The line 50 shown in FIG. 2 opens at the right end of the hydraulic unit 17 into the space 176 in the piston 171 surrounding the line 174 and only arrives from there into the space 173 surrounding the piston 171.
In der in Fig. 4 dargestellten Lage verschließt das Ventil 32 den Durchfluß durch die Bohrungen 323 und 324. Ein Abfließen von Hydraulikflüssigkeit durch das Rohr 174 ist in diesem Fall nur möglich, wenn der Dorn 174 das Rückschlagventil 38 geöffnet hat, wenn sich der Kolben 171 also in seiner äußersten linken Stellung befindet. In the position shown in FIG. 4, the valve 32 closes the flow through the bores 323 and 324. In this case, hydraulic fluid can only flow out through the pipe 174 if the mandrel 174 has opened the check valve 38 when the piston has opened 171 is therefore in its extreme left position.

Claims

P a t e n t a n s p r ü c h e : Patent claims:
1. An einem Lastfahrzeug anbringbarer Ladekran mit einem Ausleger, welcher aus mehreren teleskopartig ineinander angeordneten Armen besteht, wobei zwischen aufeinanderfolgenden Armen je eine aus Kolben und Zylinder bestehende Hydraulikeinheit angeordnet ist und beim Ausschieben eines Armes ein am vorhergehenden Arm angeordneter Anschlag ein mit dem ausgeschobenen Arm mitbewegtes Ventil betätigt, welches die Hydraulikzufuhr für den dem ausgeschobenen Arm nachfolgenden Arm freigibt, dadurch gekennzeichnet, daß das Ventil am geschlossenen Ende des Hydraulikzylinders des auf den ausgeschobenen Arm folgenden Armes angeordnet ist.1. On a truck attachable loading crane with a boom, which consists of several telescopically arranged arms, each consisting of a piston and cylinder hydraulic unit is arranged between successive arms and when extending an arm arranged on the previous arm stop one with the extended arm operated valve which releases the hydraulic supply for the arm following the extended arm, characterized in that the valve is arranged at the closed end of the hydraulic cylinder of the arm following the extended arm.
2. Ladekran nach Anspruch 1, dadurch gekennzeichnet, daß das Ventil ein Absperrventil ist, zu dem ein Rückschlagventil parallel geschaltet ist, welches in an sich bekannter Weise bei völlig eingeschobenem Kolben geöffnet ist.2. Loading crane according to claim 1, characterized in that the valve is a shut-off valve, to which a check valve is connected in parallel, which is open in a known manner with the piston fully inserted.
3. Ladekran nach Anspruch 2, dadurch gekennzeichnet, daß das Ventil ein unmittelbar an den Zylinder angeflanschtes federbeaufschlagtes Schiebeventil ist, dessen Schieberstange mit dem Anschlag zusammenwirkt. 3. Loading crane according to claim 2, characterized in that the valve is a spring-loaded slide valve flanged directly to the cylinder, the slide rod of which cooperates with the stop.
EP92922106A 1991-10-21 1992-10-21 Loading crane Expired - Lifetime EP0562096B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0209191A AT401510B (en) 1991-10-21 1991-10-21 LOADING CRANE
AT2091/91 1991-10-21
PCT/AT1992/000128 WO1993008116A1 (en) 1991-10-21 1992-10-21 Loading crane

Publications (2)

Publication Number Publication Date
EP0562096A1 true EP0562096A1 (en) 1993-09-29
EP0562096B1 EP0562096B1 (en) 1996-02-07

Family

ID=3527561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92922106A Expired - Lifetime EP0562096B1 (en) 1991-10-21 1992-10-21 Loading crane

Country Status (7)

Country Link
US (1) US5518129A (en)
EP (1) EP0562096B1 (en)
JP (1) JPH06503546A (en)
AT (2) AT401510B (en)
DE (1) DE59205304D1 (en)
ES (1) ES2086772T3 (en)
WO (1) WO1993008116A1 (en)

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US6536325B2 (en) 2000-07-11 2003-03-25 Partek Cargotec, S.A. Hydraulic cylinder for telescopic arms

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ITVR20070004U1 (en) * 2007-01-19 2008-07-20 Patrizia Baruffaldi OPERATING MACHINE
DE102008013765A1 (en) * 2008-03-12 2009-09-17 Linde Material Handling Gmbh Device for securing the sequence of movements of at least two fluid-operated displacement units
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US6536325B2 (en) 2000-07-11 2003-03-25 Partek Cargotec, S.A. Hydraulic cylinder for telescopic arms

Also Published As

Publication number Publication date
EP0562096B1 (en) 1996-02-07
JPH06503546A (en) 1994-04-21
ATE133921T1 (en) 1996-02-15
DE59205304D1 (en) 1996-03-21
AT401510B (en) 1996-09-25
WO1993008116A1 (en) 1993-04-29
US5518129A (en) 1996-05-21
ATA209191A (en) 1996-02-15
ES2086772T3 (en) 1996-07-01

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