EP0581270A2 - Telescopic system of several plunger-type cylinders, particularly for multistage telescope jibs of cranes or the like - Google Patents

Telescopic system of several plunger-type cylinders, particularly for multistage telescope jibs of cranes or the like Download PDF

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Publication number
EP0581270A2
EP0581270A2 EP93112071A EP93112071A EP0581270A2 EP 0581270 A2 EP0581270 A2 EP 0581270A2 EP 93112071 A EP93112071 A EP 93112071A EP 93112071 A EP93112071 A EP 93112071A EP 0581270 A2 EP0581270 A2 EP 0581270A2
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EP
European Patent Office
Prior art keywords
plunger
cylinder
check valve
piston
cylinders
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
EP93112071A
Other languages
German (de)
French (fr)
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EP0581270A3 (en
EP0581270B1 (en
Inventor
Ernst Kaspar
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.)
Compact Truck AG
Original Assignee
EC Engineering and Consulting Spezialmaschinen GmbH
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Publication of EP0581270A2 publication Critical patent/EP0581270A2/en
Publication of EP0581270A3 publication Critical patent/EP0581270A3/xx
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Publication of EP0581270B1 publication Critical patent/EP0581270B1/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
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1476—Special return means
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions

Definitions

  • the invention relates to a telescopic arrangement comprising a plurality of plunger cylinders, in particular for telescopic booms in cranes or the like, in which the plunger cylinders are arranged such that they can be moved longitudinally with respect to one another and can be extended into one another in the manner of a piston-cylinder arrangement by pressurizing with a hydraulic medium.
  • the invention is based on the object of designing a telescopic arrangement of the type mentioned in such a way that, starting from the plunger cylinder with the largest cross section, the plunger cylinder with the next smallest cross section is first fully extended and the reverse sequence is accordingly observed when retracting.
  • each of the longitudinally displaceable plunger cylinders is closed at its rear end in the extension direction by a piston crown, with a piston extending between its axially two sides in the piston crown a shut-off valve lockable overflow channel for the hydraulic medium and in the area of the piston head an actuator for the shut-off valve is provided, which opens the shut-off valve when the plunger cylinder is fully extended and that in the cylinder chamber each of the longitudinally displaceable plunger cylinders axially against the piston cylinder of the next plunger cylinder arranged in the cylinder chamber
  • Force of a spring to the piston crown adjustable locking ring is provided which actuates at least one radially adjustable locking member which blocks the displacement of this plunger cylinder relative to the plunger cylinder surrounding it when the locking ring is in the position of the locking ring facing away from the piston crown.
  • each of the longitudinally displaceable plunger cylinders is closed at its rear end in the extension direction by a piston head, wherein in the piston head extending between its axially two sides, closable by a check valve and with a return flow overflow channel for the hydraulic medium provided in the piston chamber by the check valve blocking the piston head and in the area of the piston head there is an actuator for the check valve that opens the check valve when the plunger cylinder is fully extended, and the check valve is opened by an actuator that opens from the piston head protrudes into the cylinder chamber and is actuated by the piston crown of the plunger cylinder arranged therein, and that a lockable return line for the hydraulic medium is inserted in the plunger cylinder, which is smallest in cross section flows.
  • the advantage achieved by the invention is essentially that a supply of the hydraulic medium is always only possible in that cylinder space of the plunger cylinder that is already in its fully extended position.
  • the shut-off valve is closed so that they cannot be extended at first. Since the check valve only opens when the plunger cylinder is in its fully extended position, it is ensured that the plunger cylinder cannot be skipped or partially extended.
  • each plunger cylinder is mechanically locked in the extended position as soon as it is fully extended and the shut-off valve for filling the subsequent cylinder space is opened, so that later sliding back is also ruled out.
  • This lock also ensures that the plunger cylinders are retracted in exactly the opposite order to the extension process, i.e. the plunger cylinder with the smallest cross section is retracted first, although the hydraulic medium must flow through all plunger cylinders and can only flow out at the plunger cylinder with the largest cross section , which - without the interlocking - would otherwise run in first under certain circumstances.
  • the plunger cylinders are mutually locked by preventing the hydraulic medium from flowing back through the check valve.
  • the return line opening into the plunger cylinder with the smallest cross section is opened, whereby the cylinder space of the plunger cylinder surrounding it is first emptied.
  • the actuator opens the shut-off valve of the next plunger cylinder, see above that the individual plunger cylinders are gradually emptied.
  • a separate overflow channel with a check valve and a check valve is provided for retracting the plunger cylinder.
  • the actuating element for the check valve is formed by an adjusting ring which is arranged in an annular groove in the outer surface of the plunger cylinder and is axially adjustable against the force of a spring toward the end face of the piston head, the adjusting ring being protruding radially inwards Ring shoulder is actuated, which is provided at the free open end of the plunger cylinder surrounding the piston crown.
  • the collar on its side facing the ring shoulder has a collar, the radially outer surface of which is guided on the inner wall of the surrounding plunger cylinder and the end face of which forms a stop for the ring shoulder.
  • the closing body of the valve can expediently be provided with a plunger projecting axially against the adjusting ring.
  • the locking ring is provided on its circumferential surface with an annular groove, the groove wall of which facing the piston head forms a run-on slope for the locking member.
  • the locking member can be formed by a ball which is arranged in a bore in the wall of the plunger cylinder.
  • a recess or an annular groove for the entry of the locking member is advantageously provided.
  • the force required to retract the boom can be applied by the payload hanging on the boom.
  • the invention further provides that a return cable is connected to the last plunger cylinder in the extension direction, which can be wound onto a hoist winch.
  • the hoist winch can be driven by a hydraulic motor, the drive speed of which, depending on the quantity and pressure, is controlled by the hydraulic medium flowing out of the plunger cylinders via a lowering brake valve.
  • the hydraulic system that is already available for the operation of the boom can be used for driving this motor.
  • the hydraulic motor adapts to the operating conditions.
  • the hydraulic motor only has to turn so fast that the return cable is wound up. If, on the other hand, the frictional forces are greater, the hydraulic motor must exert the differential force still required to retract the individual plunger cylinders.
  • a spring motor expediently also acts on the hoist winch, which keeps the return cable tensioned even when the hydraulic motor is switched off. This ensures that the return cable is the sensitive cylinder wall surfaces cannot touch if, for example, the last extended plunger cylinder retracts slightly due to the hydraulic oil cooling. Even when the hydraulic system is retracted, the hoist winch does not have to make any idle turns.
  • the telescope arrangement can be used in the manner described above in certain applications without additional mechanical components. In a preferred use, however, it is provided that it is arranged in a boom of a crane, which is also telescopic, a plunger cylinder being connected to the boom element assigned to it. In this way, the bending forces are absorbed by the boom, while the telescopic arrangement essentially absorbs forces only in the axial direction.
  • the telescopic arrangement shown in the drawing consists of several plunger cylinders 1, 2, 3 and is particularly suitable for the actuation of telescopic booms Cranes or the like.
  • the plunger cylinders 1, 2, 3, of which only the plunger cylinder 1 connected to the crane and thus fixed and shown in FIGS. 2 and 3 of the drawing and two further plunger cylinders 2, 3 are shown, are arranged to be longitudinally displaceable relative to one another.
  • the plunger cylinders 1, 2, 3 and others are telescopically guided in the manner of a piston-cylinder arrangement by pressurization with a hydraulic medium.
  • the hydraulic medium is supplied through an opening 4, which is only indicated schematically, in the fixed plunger cylinder 1.
  • Each of the longitudinally displaceable plunger cylinders is closed by a piston head 5 on its rear end side in the extension direction.
  • a piston head 5 on its rear end side in the extension direction.
  • an overflow channel 6 for the hydraulic medium which extends between its axially two sides and which can be closed by a check valve 7.
  • This check valve 7 is usually in its closed position and is only opened when the plunger cylinder 2, 3 is fully extended.
  • a locking ring 8 is provided in the cylinder space of each of the longitudinally displaceable plunger cylinders 2, 3, which can be adjusted axially against the force of a spring 9 to the piston head 5 by the piston head 5 of the next plunger cylinder 3 arranged in the cylinder chamber.
  • the locking ring 8 actuates one or more locking members 10, which the displaceability of this plunger cylinder 3 relative to him enclosing plunger cylinder 2 locks when the locking ring 8 is in its position facing away from the piston crown 5.
  • a check valve 24 is initially provided in the overflow channel 6 to lock the individual plunger cylinders 2, 3, thereby preventing the hydraulic medium from flowing back.
  • the hydraulic medium in them is returned to the hydraulic device 23 via a lockable return line 25 on the plunger cylinder 3 with the smallest cross section.
  • the hydraulic medium therefore always flows in the direction from the plunger cylinder 1 with the largest cross-section to the smallest with cross-section 3, both when extending and retracting.
  • a the blocking valve 7 acting actuator 26 is provided, which protrudes from the piston crown 5 into the cylinder chamber and is actuated by the piston crown 5 of the plunger cylinder arranged therein.
  • overflow channel 6 corresponding to FIG. 2 being provided for extending the plunger cylinders 2, 3, while the other overflow channel 27 is used for retracting the plunger cylinders 2, 3.
  • the actuator 26 act directly on the check valve 7 of the first overflow channel 6, so that only a single overflow channel 6 is then required.
  • the actuator for the check valve 7 is one Adjusting ring 11 is formed, which is arranged in an annular groove 12 in the outer surface of the plunger cylinder 2, 3 and axially adjustable against the force of a spring 13 to the outer end face of the piston head 5.
  • the adjusting ring 11 is actuated by a radially inwardly projecting annular shoulder 14 which is provided at the free open end of the plunger cylinder 1, 2 surrounding the piston crown 5.
  • the adjusting ring 11 has on its side facing the annular shoulder 14 a collar 15, the radially outer surface of which is guided on the inner wall of the surrounding plunger cylinder 1, 2.
  • the end face of the collar 15 forms a stop for the annular shoulder 14.
  • the closing body 7.1 of the check valve 7 is spherical in the exemplary embodiment and is located in a valve chamber in which the closing body 7.1 is held in the valve closing position by a spring 7.2.
  • the closing body 7.1 is provided with a plunger 16 projecting axially against the adjusting ring 11, by means of which the closing body 7.1 is lifted off the valve seat as soon as the collar 15 of the adjusting ring 11 abuts the annular shoulder 14.
  • the locking ring 8 in the embodiment according to FIG. 2 is provided on its peripheral surface with an annular groove 17, the groove wall 18 of which faces the piston head forms a run-on slope for the locking member 10.
  • the locking member 10 is designed as a ball, which is arranged in a bore in the wall of the plunger cylinder 2, 3. At the free, open end of the plunger cylinder 1, 2, 3, a recess 19 or an annular groove is provided, which allows the entry of the locking member 10, whereby a mutual mechanical locking of the two adjacent plunger cylinders 1, 2, 3 is achieved.
  • the first displaceable plunger cylinder 2 is first extended, since the check valve 7 arranged in the piston crown 5 of this plunger cylinder 2 is initially closed.
  • the adjusting ring 11 abuts the annular shoulder 14 and thereby opens the shut-off valve 7.
  • the hydraulic fluid can flow into the next cylinder space, but only in this, since all subsequent shut-off valves 7 are in a corresponding manner Way are still closed. In this way, all plunger cylinders 2, 3 are subsequently extended in the order of decreasing cross-section and locked in the extended position.
  • a return cable 20 is connected to the last plunger cylinder 3 in the extension direction or to the piston displaceably guided in the last plunger cylinder, which cable can be wound onto a winch 21.
  • This hoist winch 21 is expediently driven by a hydraulic motor 22, which can also be fed by the hydraulic device 23, which is required anyway for actuating the telescopic arrangement.
  • the drive speed of the hydraulic device is controlled in a quantity-dependent and / or pressure-dependent manner by the hydraulic medium flowing out of the plunger piston cylinders 1, 2, 3 via a valve, in particular a lowering brake valve.
  • a rope tensioning device in particular a spring motor 28, also acts on the hoist winch 21, which holds the return rope tensioned even when the hydraulic motor 22 is switched off. This ensures that the return cable 20 is always held in a tensioned state so that it cannot touch even the sensitive cylinder wall surfaces. This is particularly important insofar as a slight retraction of the individual plunger cylinders 1, 2, 3 due to cooling of the hydraulic medium cannot be ruled out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jib Cranes (AREA)
  • Actuator (AREA)

Abstract

The telescopic system consisting of several plunger-type cylinders (1, 2, 3) is intended in particular for the actuation of a jib in cranes or the like. The plunger-type cylinders (1, 2, 3) are arranged to be longitudinally displaceable relative to one another and are guided one inside the other like a piston/cylinder arrangement in such a way as to be extendable by pressurising with a hydraulic medium. Each of the longitudinally displaceable plunger-type cylinders (1, 2, 3) is closed by a plunger head (5) at its rear end face in the extension direction. In this arrangement, an overflow passage (6) for the hydraulic medium is provided in the plunger head (5), which overflow passage (6) extends axially between its two sides and can be closed by a check valve (7), and an actuating member for the check valve (7) is provided in the area of the plunger head (5). The check valve (7) is opened only when the plunger-type cylinders (2, 3) are fully extended. Provided in the cylinder space of each of the longitudinally displaceable plunger-type cylinders (2, 3) is a locking ring (8) which can be adjusted axially by the plunger head (5) of the next plunger-type cylinder (3) arranged in the cylinder space against the force of a spring (9) towards the plunger head (5) and actuates at least one radially adjustable locking member (10). In the position of the locking ring (8) remote from the plunger head (5), the locking member (10) locks the displaceability of this plunger-type cylinder (3, 2) relative to the plunger-type cylinder (2, 1) enclosing it. The retraction of the individual plunger-type cylinders is achieved by the application of an external force to a rope held permanently tensioned by means of a travel motor. <IMAGE>

Description

Die Erfindung betrifft eine Teleskopanordnung aus mehreren Tauchkolbenzylindern, insbesondere für Teleskopausleger bei Kranen oder dergl., bei der die Tauchkolbenzylinder längsverschieblich zueinander angeordnet und in der Art einer Kolben-Zylinder-Anordnung durch Druckbeaufschlagung mit einem Hydraulikmedium ausfahrbar ineinander geführt sind.The invention relates to a telescopic arrangement comprising a plurality of plunger cylinders, in particular for telescopic booms in cranes or the like, in which the plunger cylinders are arranged such that they can be moved longitudinally with respect to one another and can be extended into one another in the manner of a piston-cylinder arrangement by pressurizing with a hydraulic medium.

Bei derartigen aus der Praxis bekannten Teleskopanordnungen ist nicht sichergestellt, daß jeweils ein Tauchkolbenzylinder nach dem anderen vollständig aus- und entsprechend wieder eingefahren wird. Aufgrund unterschiedlicher Reibungszustände zwischen den einzelnen Tauchkolbenzylindern kann es zu einem Überspringen bzw. Teilausfahren der einzelnen Tauchkolbenzylinder kommen.In such telescope arrangements known from practice, it is not ensured that one plunger cylinder after the other is fully extended and retracted accordingly. Due to different friction states between the individual plunger cylinders, the individual plunger cylinders may skip or partially extend.

Der Erfindung liegt die Aufgabe zugrunde, eine Teleskopanordnung der eingangs genannten Art so auszubilden, daß ausgehend von dem im Querschnitt größten Tauchkolbenzylinder in geordneter Reihenfolge stets der im Querschnitt nächstkleinere Tauchkolbenzylinder zunächst vollständig ausgefahren und entsprechend beim Wiedereinfahren die umgekehrte Reihenfolge eingehalten wird.The invention is based on the object of designing a telescopic arrangement of the type mentioned in such a way that, starting from the plunger cylinder with the largest cross section, the plunger cylinder with the next smallest cross section is first fully extended and the reverse sequence is accordingly observed when retracting.

Diese Aufgabe wird nach einer ersten Ausführungsform der Erfindung dadurch gelöst, daß jeder der längsverschieblichen Tauchkolbenzylinder an seiner in Ausfahrrichtung hinteren Stirnseite durch einen Kolbenboden geschlossen ist, wobei im Kolbenboden ein sich zwischen seinen axial beiden Seiten erstreckender, durch ein Sperrventil schließbarer Überströmkanal für das Hydraulikmedium und im Bereich des Kolbenbodens ein Betätigungsglied für das Sperrventil vorgesehen ist, das das Sperrventil bei vollständig ausgefahrenem Tauchkolbenzylinder öffnet und daß im Zylinderraum jedes der längsverschieblichen Tauchkolbenzylinder ein durch den Kolbenboden des im Zylinderraum angeordneten, nächsten Tauchkolbenzylinders axial gegen die Kraft einer Feder zum Kolbenboden hin verstellbarer Verriegelungsring vorgesehen ist, der wenigstens ein radial verstellbares Verriegelungsglied betätigt, das bei dem Kolbenboden abgewandter Stellung des Verriegelungsrings die Verschiebbarkeit dieses Tauchkolbenzylinders gegenüber dem ihn umschließenden Tauchkolbenzylinder sperrt.This object is achieved according to a first embodiment of the invention in that each of the longitudinally displaceable plunger cylinders is closed at its rear end in the extension direction by a piston crown, with a piston extending between its axially two sides in the piston crown a shut-off valve lockable overflow channel for the hydraulic medium and in the area of the piston head an actuator for the shut-off valve is provided, which opens the shut-off valve when the plunger cylinder is fully extended and that in the cylinder chamber each of the longitudinally displaceable plunger cylinders axially against the piston cylinder of the next plunger cylinder arranged in the cylinder chamber Force of a spring to the piston crown adjustable locking ring is provided which actuates at least one radially adjustable locking member which blocks the displacement of this plunger cylinder relative to the plunger cylinder surrounding it when the locking ring is in the position of the locking ring facing away from the piston crown.

Nach einer zweiten Ausführungsform der Erfindung wird die Aufgabe dadurch gelöst, daß jeder der längsverschieblichen Tauchkolbenzylinder an seiner in Ausfahrrichtung hinteren Stirnseite durch einen Kolbenboden geschlossen ist, wobei im Kolbenboden ein sich zwischen seinen axial beiden Seiten erstreckender, durch ein Sperrventil schließbarer und mit einem den Rückfluß aus dem Zylinderraum durch den Kolbenboden sperrenden Rückschlagventil versehener Überströmkanal für das Hydraulikmedium und im Bereich des Kolbenbodens ein Betätigungsglied für das Sperrventil vorgesehen ist, das das Sperrventil bei vollständig ausgefahrenem Tauchkolbenzylinder öffnet, und wobei das Sperrventil durch ein Stellglied geöffnet wird, das vom Kolbenboden aus in den Zylinderraum hinein vorsteht und von dem Kolbenboden des darin angeordneten Tauchkolbenzylinders betätigt wird, und daß in den im Querschnitt kleinsten Tauchkolbenzylinder eine absperrbare Rückführleitung für das Hydraulikmedium mündet.According to a second embodiment of the invention, the object is achieved in that each of the longitudinally displaceable plunger cylinders is closed at its rear end in the extension direction by a piston head, wherein in the piston head extending between its axially two sides, closable by a check valve and with a return flow overflow channel for the hydraulic medium provided in the piston chamber by the check valve blocking the piston head and in the area of the piston head there is an actuator for the check valve that opens the check valve when the plunger cylinder is fully extended, and the check valve is opened by an actuator that opens from the piston head protrudes into the cylinder chamber and is actuated by the piston crown of the plunger cylinder arranged therein, and that a lockable return line for the hydraulic medium is inserted in the plunger cylinder, which is smallest in cross section flows.

Der durch die Erfindung erreichte Vorteil besteht im wesentlichen darin, daß eine Zufuhr des Hydraulikmediums jeweils immer nur in denjenigen Zylinderraum des Tauchkolbenzylinders hinein möglich ist, der sich bereits in seiner vollständig ausgefahrenen Stellung befindet. Bei allen nachfolgenden Tauchkolbenzylindern ist das Sperrventil geschlossen, so daß diese zunächst nicht ausgefahren werden können. Da das Sperrventil erst dann öffnet, wenn sich der Tauchkolbenzylinder in seiner vollständig ausgefahrenen Stellung befindet, ist sichergestellt, daß ein Überspringen bzw. Teilausfahren der Tauchkolbenzylinder nicht möglich ist. Zusätzlich wird bei der ersten Ausführungsform der Erfindung jeder Tauchkolbenzylinder, sobald er vollständig ausgefahren ist und das Sperrventil zur Füllung des nachfolgenden Zylinderraums geöffnet ist, in der ausgefahrenen Stellung mechanisch arretiert, so daß auch ein späteres Zurückgleiten ausgeschlossen ist. Diese Verriegelung stellt insbes. auch sicher, daß das Einfahren der Tauchkolbenzylinder sich in genau umgekehrter Reihenfolge gegenüber dem Ausfahrvorgang vollzieht, also der im Querschnitt kleinste Tauchkolbenzylinder zuerst eingefahren wird, obwohl das Hydraulikmedium sämtliche Tauchkolbenzylinder durchströmen muß und erst an dem im Querschnitt größten Tauchkolbenzylinder abfließen kann, der - ohne die Verriegelung - sonst unter Umständen zuerst einfahren würde.The advantage achieved by the invention is essentially that a supply of the hydraulic medium is always only possible in that cylinder space of the plunger cylinder that is already in its fully extended position. In all subsequent plunger cylinders, the shut-off valve is closed so that they cannot be extended at first. Since the check valve only opens when the plunger cylinder is in its fully extended position, it is ensured that the plunger cylinder cannot be skipped or partially extended. In addition, in the first embodiment of the invention, each plunger cylinder is mechanically locked in the extended position as soon as it is fully extended and the shut-off valve for filling the subsequent cylinder space is opened, so that later sliding back is also ruled out. This lock also ensures that the plunger cylinders are retracted in exactly the opposite order to the extension process, i.e. the plunger cylinder with the smallest cross section is retracted first, although the hydraulic medium must flow through all plunger cylinders and can only flow out at the plunger cylinder with the largest cross section , which - without the interlocking - would otherwise run in first under certain circumstances.

Bei der zweiten Ausführungsform erfolgt die gegenseitige Arretierung der Tauchkolbenzylinder dagegen dadurch, daß ein Rückfließen des Hydraulikmediums durch das Rückschlagventil verhindert wird. Um die Tauchkolbenzylinder wieder einzufahren, wird die in den im Querschnitt kleinsten Tauchkolbenzylinder mündende Rückführleitung geöffnet, wodurch zunächst der Zylinderraum des diesen umschließenden Tauchkolbenzylinders entleert wird. Sobald dieser Zylinderraum leer ist, wird durch das Stellglied das Sperrventil des nächsten Tauchkolbenzylinders geöffnet, so daß eine sukzessive Entleerung der einzelnen Tauchkolbenzylinder erfolgt. Hierbei besteht insbesondere auch die Möglichkeit, daß für das Einfahren der Tauchkolbenzylinder ein eigener Überströmkanal mit einem Sperrventil und einem Rückschlagventil vorgesehen ist. Beim Ausfahren der Tauchkolbenzylinder durchfließt das Hydraulikmedium dann jeweils den einen Überströmkanal, beim Einfahren der Tauchkolbenzylinder dagegen den anderen. Hierdurch besteht beispielsweise die Möglichkeit, die dynamischen Eigenschaften beim Aus- bzw. Einfahren durch die Anordnung und Ausbildung der Überströmkanäle unabhängig voneinander zu optimieren.In the second embodiment, on the other hand, the plunger cylinders are mutually locked by preventing the hydraulic medium from flowing back through the check valve. In order to retract the plunger cylinders, the return line opening into the plunger cylinder with the smallest cross section is opened, whereby the cylinder space of the plunger cylinder surrounding it is first emptied. As soon as this cylinder space is empty, the actuator opens the shut-off valve of the next plunger cylinder, see above that the individual plunger cylinders are gradually emptied. In particular, there is also the possibility that a separate overflow channel with a check valve and a check valve is provided for retracting the plunger cylinder. When the plunger cylinders are extended, the hydraulic medium then flows through one overflow channel, while when the plunger cylinders are retracted, the other flows. This gives, for example, the possibility of independently optimizing the dynamic properties when extending or retracting by arranging and designing the overflow channels.

In bevorzugter Ausführungsform der Erfindung ist das Betätigungsglied für das Sperrventil von einem Stellring gebildet, der in einer Ringnut in der Mantelfläche des Tauchkolbenzylinders angeordnet und axial gegen die Kraft einer Feder zur Stirnfläche des Kolbenbodens hin verstellbar ist, wobei der Stellring von einer radial nach innen vorstehenden Ringschulter betätigt wird, die am freien offenen Ende des den Kolbenboden umschließenden Tauchkolbenzylinders vorgesehen ist. Dabei ist weiter vorgesehen, daß der Stellring auf seiner der Ringschulter zugewandten Seite einen Kragen aufweist, dessen radial äußere Mantelfläche an der Innenwand des umschließenden Tauchkolbenzylinders geführt ist und dessen Stirnfläche einen Anschlag für die Ringschulter bildet. Der Schließkörper des Ventils kann hierbei zweckmäßigerweise mit einem axial gegen den Stellring vorstehenden Stößel versehen sein.In a preferred embodiment of the invention, the actuating element for the check valve is formed by an adjusting ring which is arranged in an annular groove in the outer surface of the plunger cylinder and is axially adjustable against the force of a spring toward the end face of the piston head, the adjusting ring being protruding radially inwards Ring shoulder is actuated, which is provided at the free open end of the plunger cylinder surrounding the piston crown. It is further provided that the collar on its side facing the ring shoulder has a collar, the radially outer surface of which is guided on the inner wall of the surrounding plunger cylinder and the end face of which forms a stop for the ring shoulder. The closing body of the valve can expediently be provided with a plunger projecting axially against the adjusting ring.

In einer ebenfalls bevorzugten Ausführungsform der Erfindung ist der Verriegelungsring an seiner Umfangsfläche mit einer Ringnut versehen, deren dem Kolbenboden zugewandte Nutwand eine Anlaufschräge für das Verriegelungsglied bildet. In besonders einfacher Ausgestaltung kann das Verriegelungsglied von einer Kugel gebildet sein, die in einer Bohrung in der Wand des Tauchkolbenzylinders angeordnet ist.In a likewise preferred embodiment of the invention, the locking ring is provided on its circumferential surface with an annular groove, the groove wall of which facing the piston head forms a run-on slope for the locking member. In a particularly simple way Embodiment, the locking member can be formed by a ball which is arranged in a bore in the wall of the plunger cylinder.

Am freien, offenen Ende des Tauchkolbenzylinders ist vorteilhafterweise eine Ausnehmung oder eine Ringnut für den Eintritt des Verriegelungsglieds vorgesehen.At the free, open end of the plunger cylinder, a recess or an annular groove for the entry of the locking member is advantageously provided.

Die zum Einfahren des Auslegers erforderliche Kraft kann von der am Ausleger hängenden Nutzlast aufgebracht werden. Da diese Nutzlast jedoch nicht immer vorhanden bzw. häufig nicht ausreichend groß ist, sieht die Erfindung weiter vor, daß an dem in Ausfahrrichtung letzten Tauchkolbenzylinder ein Rückholseil angeschlossen ist, das auf eine Hubwinde aufspulbar ist. Die Hubwinde kann hierbei von einem Hydraulikmotor angetrieben sein, dessen Antriebsgeschwindigkeit mengen- und druckabhängig von dem aus den Tauchkolbenzylindern abfließenden Hydraulikmedium über ein Senkbremsventil gesteuert ist. Dadurch kann zunächst für den Antrieb dieses Motors das für den Betrieb des Auslegers ohnehin vorhandene Hydrauliksystem mit verwendet werden kann. Darüber hinaus paßt sich der Hydraulikmotor in seiner Arbeitsweise an die Betriebbedingungen an. Ist die auf den Teleskopausleger einwirkende Kraft größer als die Summe der Reibungskräfte der einzelnen Tauchkolbenzylinder, so muß der Hydraulikmotor lediglich so schnell drehen, daß das Rückholseil aufgespult wird. Sind dagegen die Reibungskräfte größer, so muß der Hydraulikmotor die zum Einfahren der einzelnen Tauchkolbenzylinder noch erforderliche Differenzkraft aufbringen.The force required to retract the boom can be applied by the payload hanging on the boom. However, since this payload is not always present or is often not sufficiently large, the invention further provides that a return cable is connected to the last plunger cylinder in the extension direction, which can be wound onto a hoist winch. The hoist winch can be driven by a hydraulic motor, the drive speed of which, depending on the quantity and pressure, is controlled by the hydraulic medium flowing out of the plunger cylinders via a lowering brake valve. As a result, the hydraulic system that is already available for the operation of the boom can be used for driving this motor. In addition, the hydraulic motor adapts to the operating conditions. If the force acting on the telescopic boom is greater than the sum of the frictional forces of the individual plunger cylinders, the hydraulic motor only has to turn so fast that the return cable is wound up. If, on the other hand, the frictional forces are greater, the hydraulic motor must exert the differential force still required to retract the individual plunger cylinders.

Zweckmäßigerweise greift an der Hubwinde zusätzlich ein Federmotor an, der das Rückholseil auch bei abgeschaltetem Hydraulikmotor gespannt hält. Dadurch ist sicher gestellt, daß das Rückholseil die empfindlichen Zylinderwandflächen nicht berühren kann, wenn beispielsweise der letzte ausgefahrene Tauchkolbenzylinder infolge einer Abkühlung des Hydrauliköls geringfügig einfährt. Auch beim Wiedereinfahren des Hydrauliksystems muß die Hubwinde hierdurch keine Leerumdrehungen fahren.A spring motor expediently also acts on the hoist winch, which keeps the return cable tensioned even when the hydraulic motor is switched off. This ensures that the return cable is the sensitive cylinder wall surfaces cannot touch if, for example, the last extended plunger cylinder retracts slightly due to the hydraulic oil cooling. Even when the hydraulic system is retracted, the hoist winch does not have to make any idle turns.

Die Teleskopanordnung kann in der vorstehend beschriebenen Weise in bestimmten Einsatzfällen ohne zusätzliche mechanische Bauelemente Verwendung finden. In bevorzugter Verwendungsweise ist jedoch vorgesehen, daß sie in einem ebenfalls teleskopartig ausgebildeten Ausleger eines Krans angeordnet ist, wobei jeweils ein Tauchkolbenzylinder mit dem ihm zugeordneten Auslegerelement verbunden ist. Auf diese Weise werden die Biegekräfte von dem Ausleger aufgenommen, während die Teleskopanordnung im wesentlichen nur in axialer Richtung Kräfte aufnimmt.The telescope arrangement can be used in the manner described above in certain applications without additional mechanical components. In a preferred use, however, it is provided that it is arranged in a boom of a crane, which is also telescopic, a plunger cylinder being connected to the boom element assigned to it. In this way, the bending forces are absorbed by the boom, while the telescopic arrangement essentially absorbs forces only in the axial direction.

Im folgenden wird die Erfindung an einem in der Zeichnung dargestellten Ausführungsbeispiel näher erläutert; es zeigen:

Fig. 1
eine Teleskopanordnung nach der Erfindung in schematischer Darstellung,
Fig. 2
die Teleskopanordnung im Längsschnitt und nur teilweiser Darstellung,
Fig. 3
die Teleskopanordnung in einer zweiten Ausführungsform, ebenfalls im Längsschnitt und nur teilweise dargestellt.
In the following the invention is explained in more detail using an exemplary embodiment shown in the drawing; show it:
Fig. 1
a telescopic arrangement according to the invention in a schematic representation,
Fig. 2
the telescope arrangement in longitudinal section and only partial representation,
Fig. 3
the telescope arrangement in a second embodiment, also shown in longitudinal section and only partially.

Die in der Zeichnung dargestellte Teleskopanordnung besteht aus mehreren Tauchkolbenzylindern 1,2,3 und ist insbesondere für die Betätigung von Teleskopauslegern bei Kranen oder dergl. vorgesehen. Im einzelnen sind die Tauchkolbenzylinder 1, 2, 3, von denen in den Fig. 2 und 3 der Zeichnung lediglich der am Kran angeschlossene und somit feststehende Tauchkolbenzylinder 1 sowie zwei weitere Tauchkolbenzylinder 2, 3 dargestellt sind, längsverschieblich zueinander angeordnet.The telescopic arrangement shown in the drawing consists of several plunger cylinders 1, 2, 3 and is particularly suitable for the actuation of telescopic booms Cranes or the like. Provided. Specifically, the plunger cylinders 1, 2, 3, of which only the plunger cylinder 1 connected to the crane and thus fixed and shown in FIGS. 2 and 3 of the drawing and two further plunger cylinders 2, 3 are shown, are arranged to be longitudinally displaceable relative to one another.

Die Tauchkolbenzylinder 1, 2, 3 und weitere sind in der Art einer Kolben-Zylinder-Anordnung durch Druckbeaufschlagung mit einem Hydraulikmedium ausfahrbar ineinandergeführt. Die Zufuhr des Hydraulikmediums erfolgt durch eine nur schematisch angedeutete Öffnung 4 im feststehenden Tauchkolbenzylinder 1.The plunger cylinders 1, 2, 3 and others are telescopically guided in the manner of a piston-cylinder arrangement by pressurization with a hydraulic medium. The hydraulic medium is supplied through an opening 4, which is only indicated schematically, in the fixed plunger cylinder 1.

Jeder der längsverschieblichen Tauchkolbenzylinder, mit Ausnahme des innersten Tauchkolbenzylinders, ist an seiner in Ausfahrrichtung hinteren Stirnseite durch einen Kolbenboden 5 geschlossen. Im Kolbenboden 5 ist ein sich zwischen seinen axial beiden Seiten erstreckender Überströmkanal 6 für das Hydraulikmedium vorgesehen, der durch ein Sperrventil 7 schließbar ist. Dieses Sperrventil 7 befindet sich gewöhnlich in seiner geschlossenen Stellung und wird erst bei vollständig ausgefahrenem Tauchkolbenzylinder 2, 3 geöffnet.Each of the longitudinally displaceable plunger cylinders, with the exception of the innermost plunger cylinder, is closed by a piston head 5 on its rear end side in the extension direction. In the piston crown 5 there is an overflow channel 6 for the hydraulic medium which extends between its axially two sides and which can be closed by a check valve 7. This check valve 7 is usually in its closed position and is only opened when the plunger cylinder 2, 3 is fully extended.

Weiter ist bei dem Ausführungsbeispiel nach Fig. 2 im Zylinderraum jedes der längsverschieblichen Tauchkolbenzylinder 2, 3 ein Verriegelungsring 8 vorgesehen, der durch den Kolbenboden 5 des im Zylinderraum angeordneten, nächsten Tauchkolbenzylinders 3 axial gegen die Kraft einer Feder 9 zum Kolbenboden 5 hin verstellbar ist. Der Verriegelungsring 8 betätigt ein oder mehrere Verriegelungsglieder 10, die die Verschiebbarkeit dieses Tauchkolbenzylinders 3 gegenüber dem ihn umschließenden Tauchkolbenzylinder 2 sperrt, wenn der Verriegelungsring 8 sich in seiner dem Kolbenboden 5 abgewandten Stellung befindet.Furthermore, in the exemplary embodiment according to FIG. 2, a locking ring 8 is provided in the cylinder space of each of the longitudinally displaceable plunger cylinders 2, 3, which can be adjusted axially against the force of a spring 9 to the piston head 5 by the piston head 5 of the next plunger cylinder 3 arranged in the cylinder chamber. The locking ring 8 actuates one or more locking members 10, which the displaceability of this plunger cylinder 3 relative to him enclosing plunger cylinder 2 locks when the locking ring 8 is in its position facing away from the piston crown 5.

Bei dem Ausführungsbeispiel nach Fig. 3 ist dagegen zur Verriegelung der einzelnen Tauchkolbenzylinder 2, 3 zunächst ein Rückschlagventil 24 im Überströmkanal 6 vorgesehen, wodurch ein Rückströmen des Hydraulikmediums ausgeschlossen ist. Um die einzelnen Tauchkolbenzylinder 2, 3 wieder einzufahren, wird das in ihnen befindliche Hydraulikmedium an dem im Querschnitt kleinsten Tauchkolbenzylinder 3 über eine absperrbare Rückführleitung 25 in die Hydraulikeinrichtung 23 zurückgeführt. Das Hydraulikmedium fließt also sowohl beim Aus- wie auch beim Einfahren stets in Richtung von dem im Querschnitt größten Tauchkolbenzylinder 1 zu dem im Querschnitt kleinsten 3. Um das Entleeren der einzelnen Tauchkolbenzylinder 1, 2, 3 in der vorgesehenen Reihenfolge zu ermöglichen, ist ein auf das Sperrventil 7 wirkendes Stellglied 26 vorgesehen, das vom Kolbenboden 5 aus in den Zylinderraum hinein vorsteht und von dem Kolbenboden 5 des darin angeordneten Tauchkolbenzylinders betätigt wird.In the embodiment according to FIG. 3, on the other hand, a check valve 24 is initially provided in the overflow channel 6 to lock the individual plunger cylinders 2, 3, thereby preventing the hydraulic medium from flowing back. In order to retract the individual plunger cylinders 2, 3, the hydraulic medium in them is returned to the hydraulic device 23 via a lockable return line 25 on the plunger cylinder 3 with the smallest cross section. The hydraulic medium therefore always flows in the direction from the plunger cylinder 1 with the largest cross-section to the smallest with cross-section 3, both when extending and retracting. In order to enable the individual plunger cylinders 1, 2, 3 to be emptied in the order provided, a the blocking valve 7 acting actuator 26 is provided, which protrudes from the piston crown 5 into the cylinder chamber and is actuated by the piston crown 5 of the plunger cylinder arranged therein.

In dem in der Zeichnung dargestellten Ausführungsbeispiel sind zwei getrennte Überströmkanäle 6, 27 vorgesehen, wobei der der Fig. 2 entsprechende Überströmkanal 6 zum Ausfahren der Tauchkolbenzylinder 2, 3 vorgesehen ist, während der andere Überströmkanal 27 dem Einfahren der Tauchkolbenzylinder 2, 3 dient. Es besteht aber ebenso die in der Zeichnung nicht dargestellte Möglichkeit, das Stellglied 26 unmittelbar auf das Sperrventil 7 des ersten Überströmkanals 6 wirken zu lassen, so daß dann nur ein einziger Überströmkanal 6 benötigt wird.In the embodiment shown in the drawing, two separate overflow channels 6, 27 are provided, the overflow channel 6 corresponding to FIG. 2 being provided for extending the plunger cylinders 2, 3, while the other overflow channel 27 is used for retracting the plunger cylinders 2, 3. However, there is also the possibility, not shown in the drawing, of having the actuator 26 act directly on the check valve 7 of the first overflow channel 6, so that only a single overflow channel 6 is then required.

Das Betätigungsglied für das Sperrventil 7 ist von einem Stellring 11 gebildet, der in einer Ringnut 12 in der Mantelfläche des Tauchkolbenzylinders 2, 3 angeordnet und axial gegen die Kraft einer Feder 13 zur äußeren Stirnfläche des Kolbenbodens 5 hin verstellbar ist. Der Stellring 11 wird von einer radial nach innen vorstehenden Ringschulter 14 betätigt, die am freien offenen Ende des den Kolbenboden 5 umschließenden Tauchkolbenzylinders 1, 2 vorgesehen ist. Der Stellring 11 weist auf seiner der Ringschulter 14 zugewandten Seite einen Kragen 15 auf, dessen radial äußere Mantelfläche an der Innenwand des umschließenden Tauchkolbenzylinders 1, 2 geführt ist. Die Stirnfläche des Kragens 15 bildet dabei einen Anschlag für die Ringschulter 14.The actuator for the check valve 7 is one Adjusting ring 11 is formed, which is arranged in an annular groove 12 in the outer surface of the plunger cylinder 2, 3 and axially adjustable against the force of a spring 13 to the outer end face of the piston head 5. The adjusting ring 11 is actuated by a radially inwardly projecting annular shoulder 14 which is provided at the free open end of the plunger cylinder 1, 2 surrounding the piston crown 5. The adjusting ring 11 has on its side facing the annular shoulder 14 a collar 15, the radially outer surface of which is guided on the inner wall of the surrounding plunger cylinder 1, 2. The end face of the collar 15 forms a stop for the annular shoulder 14.

Der Schließkörper 7.1 des Sperrventils 7 ist im Ausführungsbeispiel kugelförmig ausgebildet und befindet sich in einer Ventilkammer, in der der Schließkörper 7.1 durch eine Feder 7.2 in der das Ventil schließenden Stellung gehalten ist. Der Schließkörper 7.1 ist zu seiner Betätigung mit einem axial gegen den Stellring 11 vorstehenden Stößel 16 versehen, durch den der Schließkörper 7.1 von dem Ventilsitz abgehoben wird, sobald der Kragen 15 des Stellrings 11 an der Ringschulter 14 anstößt.The closing body 7.1 of the check valve 7 is spherical in the exemplary embodiment and is located in a valve chamber in which the closing body 7.1 is held in the valve closing position by a spring 7.2. For its actuation, the closing body 7.1 is provided with a plunger 16 projecting axially against the adjusting ring 11, by means of which the closing body 7.1 is lifted off the valve seat as soon as the collar 15 of the adjusting ring 11 abuts the annular shoulder 14.

Der Verriegelungsring 8 bei der Ausführungsform nach Fig. 2 ist an seiner Umfangsfläche mit einer Ringnut 17 versehen, deren dem Kolbenboden zugewandte Nutwand 18 eine Anlaufschräge für das Verriegelungsglied 10 bildet. Das Verriegelungsglied 10 ist in besonders einfacher Ausgestaltung als Kugel ausgebildet, die in einer Bohrung in der Wand des Tauchkolbenzylinders 2, 3 angeordnet ist. Am freien, offenen Ende des Tauchkolbenzylinders 1, 2, 3 ist jeweils eine Ausnehmung 19 oder eine Ringnut vorgesehen, die den Eintritt des Verriegelungsgliedes 10 ermöglicht, wodurch eine gegenseitige mechanische Sperrung der beiden sich anliegenden Tauchkolbenzylinder 1, 2, 3 erreicht wird.The locking ring 8 in the embodiment according to FIG. 2 is provided on its peripheral surface with an annular groove 17, the groove wall 18 of which faces the piston head forms a run-on slope for the locking member 10. In a particularly simple embodiment, the locking member 10 is designed as a ball, which is arranged in a bore in the wall of the plunger cylinder 2, 3. At the free, open end of the plunger cylinder 1, 2, 3, a recess 19 or an annular groove is provided, which allows the entry of the locking member 10, whereby a mutual mechanical locking of the two adjacent plunger cylinders 1, 2, 3 is achieved.

Wird bei vollständig eingefahrener Teleskopanordnung durch die Öffnung 4 Hydraulikflüssigkeit eingespeist, so wird zunächst der erste verschiebbare Tauchkolbenzylinder 2 ausgefahren, da das im Kolbenboden 5 dieses Tauchkolbenzylinders 2 angeordnete Sperrventil 7 zunächst geschlossen ist. Sobald der erste bewegliche Tauchkolbenzylinder 2 vollständig ausgefahren ist, stößt der Stellring 11 an der Ringschulter 14 an und öffnet hierdurch das Sperrventil 7. Auf diese Weise kann die Hydraulikflüssigkeit in den nächsten Zylinderraum einströmen, jedoch nur in diesen, da alle nachfolgenden Sperrventile 7 in entsprechender Weise noch geschlossen sind. In dieser Weise werden nachfolgend alle Tauchkolbenzylinder 2, 3 in der Reihenfolge mit abnehmendem Querschnitt ausgefahren und in der ausgefahrenen Stellung jeweils verriegelt.If hydraulic fluid is fed in through the opening 4 when the telescope arrangement is completely retracted, the first displaceable plunger cylinder 2 is first extended, since the check valve 7 arranged in the piston crown 5 of this plunger cylinder 2 is initially closed. As soon as the first movable plunger cylinder 2 is fully extended, the adjusting ring 11 abuts the annular shoulder 14 and thereby opens the shut-off valve 7. In this way, the hydraulic fluid can flow into the next cylinder space, but only in this, since all subsequent shut-off valves 7 are in a corresponding manner Way are still closed. In this way, all plunger cylinders 2, 3 are subsequently extended in the order of decreasing cross-section and locked in the extended position.

Durch die gegenseitige Verriegelung der einzelnen Tauchkolbenzylinder 1, 2, 3 ist beim Einfahren der Teleskopanordnung der umgekehrte Ablauf gewährleistet. Dabei kann zum Einfahren der Teleskopanordnung die an ihr hängende Nutzlast ausgenutzt werden. Da diese jedoch nicht immer vorhanden ist bzw. in ihrer Größe oft nicht ausreicht, ist an dem in Ausfahrrichtung letzten Tauchkolbenzylinder 3 bzw. an dem im letzten Tauchkolbenzylinder verschiebbar geführten Kolben ein Rückholseil 20 angeschlossen, das auf eine Winde 21 aufspulbar ist. Diese Hubwinde 21 ist zweckmäßigerweise von einem Hydraulikmotor 22 angetrieben, der von der zur Betätigung der Teleskopanordnung ohnehin erforderlichen Hydraulikeinrichtung 23 mit gespeist werden kann. Dabei wird die Antriebsgeschwindigkeit der Hydraulikeinrichtung mengen- und/oder druckabhängig von dem aus den Tauchkolbenzylindern 1,2,3 abfließenden Hydraulikmedium über ein Ventil, insbes. ein Senkbremsventil gesteuert.The mutual interlocking of the individual plunger cylinders 1, 2, 3 ensures the reverse sequence when the telescopic arrangement is retracted. The payload hanging on it can be used to retract the telescope arrangement. However, since this is not always present or is often insufficient in size, a return cable 20 is connected to the last plunger cylinder 3 in the extension direction or to the piston displaceably guided in the last plunger cylinder, which cable can be wound onto a winch 21. This hoist winch 21 is expediently driven by a hydraulic motor 22, which can also be fed by the hydraulic device 23, which is required anyway for actuating the telescopic arrangement. The drive speed of the hydraulic device is controlled in a quantity-dependent and / or pressure-dependent manner by the hydraulic medium flowing out of the plunger piston cylinders 1, 2, 3 via a valve, in particular a lowering brake valve.

An der Hubwinde 21 greift zusätzlich eine Seilspanneinrichtung, insbes. ein Federmotor 28 an, der das Rückholseil auch bei abgeschaltetem Hydraulikmotor 22 gespannt hält. Hierdurch ist sicher gestellt, daß das Rückholseil 20 stets in gespanntem Zustand gehalten wird, so daß es auch die empfindlichen Zylinderwandflächen nicht berühren kann. Dies ist insbesondere insofern von Bedeutung, als ein geringfügiges Einfahren der einzelnen Tauchkolbenzylinder 1, 2, 3 infolge einer Abkühlung des Hydraulikmediums nicht auszuschließen ist.A rope tensioning device, in particular a spring motor 28, also acts on the hoist winch 21, which holds the return rope tensioned even when the hydraulic motor 22 is switched off. This ensures that the return cable 20 is always held in a tensioned state so that it cannot touch even the sensitive cylinder wall surfaces. This is particularly important insofar as a slight retraction of the individual plunger cylinders 1, 2, 3 due to cooling of the hydraulic medium cannot be ruled out.

Claims (13)

Teleskopanordnung aus mehreren Tauchkolbenzylindern (1, 2, 3), insbesondere für Teleskopausleger bei Kranen oder dergl., bei der die Tauchkolbenzylinder (1, 2, 3) längsverschieblich zueinander angeordnet und in der Art einer Kolben-Zylinder-Anordnung durch Druckbeaufschlagung mit einem Hydraulikmedium ausfahrbar ineinander geführt sind, dadurch gekennzeichnet, daß jeder der längsverschieblichen Tauchkolbenzylinder (2, 3) an seiner in Ausfahrrichtung hinteren Stirnseite durch einen Kolbenboden (5) geschlossen ist, wobei im Kolbenboden (5) ein sich zwischen seinen axial beiden Seiten erstreckender, durch ein Sperrventil (7) schließbarer Überströmkanal (6) für das Hydraulikmedium und im Bereich des Kolbenbodens (5) ein Betätigungsglied für das Sperrventil (7) vorgesehen ist, das das Sperrventil (7) bei vollständig ausgefahrenem Tauchkolbenzylinder (2, 3) öffnet, und daß im Zylinderraum jedes der längsverschieblichen Tauchkolbenzylinder (2, 3) ein durch den Kolbenboden (5) des im Zylinderraum angeordneten, nächsten Tauchkolbenzylinders (3) axial gegen die Kraft einer Feder (9) zum Kolbenboden (5) hin verstellbarer Verriegelungsring (8) vorgesehen ist, der wenigstens ein radial verstellbares Verriegelungsglied (10) betätigt, das bei dem Kolbenboden (5) abgewandter Stellung des Verriegelungsrings (8) die Verschiebbarkeit dieses Tauchkolbenzylinders (3, 2) gegenüber dem ihn umschließenden Tauchkolbenzylinder (2, 1) sperrt.Telescopic arrangement consisting of several plunger cylinders (1, 2, 3), in particular for telescopic booms on cranes or the like, in which the plunger cylinders (1, 2, 3) are arranged to be longitudinally displaceable relative to one another and in the manner of a piston-cylinder arrangement by pressurizing with a hydraulic medium extendable into each other, characterized in that each of the longitudinally displaceable plunger cylinders (2, 3) is closed at its rear end in the direction of extension by a piston crown (5), the piston crown (5) extending between its axially two sides by a Check valve (7) closable overflow channel (6) for the hydraulic medium and in the region of the piston head (5) an actuator for the check valve (7) is provided, which opens the check valve (7) when the plunger cylinder (2, 3) is fully extended, and that in the cylinder chamber of each of the longitudinally displaceable plunger cylinders (2, 3) through the piston crown (5) of the next plunger cylinder (3) which is arranged in the cylinder chamber and which is axially adjustable against the force of a spring (9) towards the piston crown (5) and which actuates at least one radially adjustable locking member (10) which is attached to the piston crown (5 ) away position of the locking ring (8) blocks the displaceability of this plunger cylinder (3, 2) relative to the surrounding plunger cylinder (2, 1). Teleskopanordnung aus mehreren Tauchkolbenzylindern (1, 2, 3), insbesondere für Teleskopausleger bei Kranen oder dergleichen, bei der die Tauchkolbenzylinder (1, 2, 3) längsverschieblich zueinander angeordnet und in der Art einer Kolben-Zylinder-Anordnung durch Druckbeaufschlagung mit einem Hydraulikmedium ausfahr ineinandergeführt sind, dadurch gekennzeichnet, daß jeder, außer dem innersten, der längsverschieblichen Tauchkolbenzylinder (2, 3) an seiner in Ausfahrrichtung hinteren Stirnseite durch einen Kolbenboden (5) geschlossen ist, wobei im Kolbenboden (5) ein sich zwischen seinen axial beiden Seiten erstreckender, durch ein Sperrventil (7) schließbarer und mit einem den Rückfluß aus dem Zylinderraum durch den Kolbenboden (5) sperrenden Rückschlagventil (24) versehener Überströmkanal (6) für das Hydraulikmedium und im Bereich des Kolbenbodens (5) ein Betätigungsglied für das Sperrventil (7) vorgesehen ist, das das Sperrventil (7) bei vollständig ausgefahrenem Tauchkolbenzylinder (2, 3) öffnet, und wobei das Sperrventil (7) durch ein Stellglied (26) geöffnet wird, das vom Kolbenboden (5) aus in den Zylinderraum hinein vorsteht und von dem Kolbenboden (5) des darin angeordneten Tauchkolbenzylinders (2, 3) betätigt wird, und daß in den im Querschnitt kleinsten Tauchkolbenzylinder (3) eine absperrbare Rückführleitung (25) für das Hydraulikmedium mündet.Telescopic arrangement of several plunger cylinders (1, 2, 3), in particular for telescopic booms in cranes or the like, in which the plunger cylinders (1, 2, 3) are arranged to be longitudinally displaceable relative to one another and extend in the manner of a piston-cylinder arrangement by pressurizing with a hydraulic medium are guided into one another, characterized in that each, except for the innermost, of the longitudinally displaceable plunger piston cylinders (2, 3) is closed at its rear end in the direction of extension by a piston crown (5), one in the piston crown (5) extending between its axially two sides , overflow channel (6) for the hydraulic medium, which can be closed by a check valve (7) and is provided with a check valve (24) which blocks the backflow from the cylinder space through the piston head (5), and an actuating element for the check valve (7) in the area of the piston head (5) ) is provided that the shut-off valve (7) when the dive is fully extended piston cylinder (2, 3) opens, and the shut-off valve (7) is opened by an actuator (26) which protrudes from the piston crown (5) into the cylinder chamber and from the piston crown (5) of the plunger cylinder (2, 3) is actuated, and that a lockable return line (25) for the hydraulic medium opens into the smallest cross-section plunger cylinder (3). Teleskopanordnung nach Anspruch 2, dadurch gekennzeichnet, daß für das Einfahren der Tauchkolbenzylinder (2, 3) ein eigener Überströmkanal (27) mit einem Sperrventil (29) und einem Rückschlagventil (30) vorgesehen ist.Telescope arrangement according to claim 2, characterized in that a separate overflow channel (27) with a check valve (29) and a check valve (30) is provided for retracting the plunger cylinder (2, 3). Teleskopanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Betätigungsglied für das Sperrventil (7) von einem Stellring (11) gebildet ist, der in einer Ringnut (12) in der Mantelfläche des Tauchkolbenzylinders (2, 3) angeordnet und axial gegen die Kraft einer Feder (13) zur Stirnfläche des Kolbenbodens (5) hin verstellbar ist, wobei der Stellring (11) von einer radial nach innen vorstehenden Ringschulter (14) betätigt wird, die am freien offenen Ende des den Kolbenboden (5) umschließenden Tauchkolbenzylinders (2, 3) vorgesehen ist.Telescope arrangement according to one of claims 1 to 3, characterized in that the actuating member for the check valve (7) is formed by an adjusting ring (11) which is arranged in an annular groove (12) in the outer surface of the plunger cylinder (2, 3) and axially against the force of a spring (13) Front face of the piston crown (5) is adjustable, the adjusting ring (11) being actuated by a radially inwardly projecting annular shoulder (14) which is provided on the free open end of the plunger cylinder (2, 3) surrounding the piston crown (5). Teleskopanordnung nach Anspruch 4, dadurch gekennzeichnet, daß der Stellring (11) auf seiner der Ringschulter (14) zugewandten Seite einen Kragen (15) aufweist, dessen radial äußere Mantelfläche an der Innenwand des ihn umschließenden Tauchkolbenzylinders (2, 3) geführt ist und dessen Stirnfläche einen Anschlag für die Ringschulter (14) bildet.Telescope arrangement according to claim 4, characterized in that the adjusting ring (11) has on its side facing the annular shoulder (14) a collar (15), the radially outer surface of which is guided on the inner wall of the plunger cylinder (2, 3) surrounding it, and the latter End face forms a stop for the ring shoulder (14). Teleskopanordnung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Schließkörper (7.1) des Ventils (7) mit einem axial gegen den Stellring (11) vorstehenden Stößel (16) versehen ist.Telescope arrangement according to claim 4 or 5, characterized in that the closing body (7.1) of the valve (7) is provided with a plunger (16) projecting axially against the adjusting ring (11). Teleskopanordnung nach einem der Ansprüche 1 und 4 bis 6, dadurch gekennzeichnet, daß der Verriegelungsring (8) an seiner Umfangsfläche mit einer Ringnut (17) versehen ist, deren dem Kolbenboden (5) zugewandte Nutwand (18) eine Anlaufschräge für das Verriegelungsglied (10) bildet.Telescope arrangement according to one of claims 1 and 4 to 6, characterized in that the locking ring (8) is provided on its circumferential surface with an annular groove (17), the groove wall (18) facing the piston head (5) of which provides a run-up slope for the locking member (10 ) forms. Teleskopanordnung nach einem der Ansprüche 1 und 4 bis 7, dadurch gekennzeichnet, daß das Verriegelungsglied (10) von einer Kugel gebildet ist, die in einer Bohrung in der Wand des Tauchkolbenzylinders (2, 3) angeordnet ist.Telescope arrangement according to one of claims 1 and 4 to 7, characterized in that the locking member (10) is formed by a ball, which is arranged in a hole in the wall of the plunger cylinder (2, 3). Teleskopanordnung nach einem der Ansprüche 1 und 4 bis 8, dadurch gekennzeichnet, daß am freien, offenen Ende des Tauchkolbenzylinders (1, 2, 3) eine oder eine Ringnut für den Eintritt des Verriegelungsglieds (10) vorgesehen ist.Telescope arrangement according to one of claims 1 and 4 to 8, characterized in that one or an annular groove for the entry of the locking member (10) is provided at the free, open end of the plunger cylinder (1, 2, 3). Teleskopanordnung nach einem der Ansprüche 1 und 4 bis 9, dadurch gekennzeichnet, daß an dem in Ausfahrrichtung letzten Tauchkolbenzylinder (3) ein Rückholseil (20) angeschlossen ist, das auf eine Hubwinde (21) aufspulbar ist.Telescope arrangement according to one of claims 1 and 4 to 9, characterized in that a return cable (20) is connected to the last plunger cylinder (3) in the extension direction and can be wound onto a hoist winch (21). Teleskopanordnung nach Anspruch 10, dadurch gekennzeichnet, daß die Hubwinde (21) von einem Hydraulikmotor (22) angetrieben ist, dessen Antriebsgeschwindigkeit mengen- und druckabhängig von dem aus den Tauchkolbenzylindern (1, 2, 3) abfließenden Hydraulikmedium über ein Senkbremsventil gesteuert ist.Telescopic arrangement according to claim 10, characterized in that the lifting winch (21) is driven by a hydraulic motor (22), the drive speed of which is controlled by a hydraulic brake motor via a lowering brake valve depending on the quantity and pressure of the hydraulic medium flowing out of the plunger cylinder (1, 2, 3). Teleskopanordnung nach Anspruch 11, dadurch gekennzeichnet, daß an der Hubwinde (21) zusätzlich ein Federmotor (28) angreift, der das Rückholseil auch bei abgeschaltetem Hydraulikmotor (22) gespannt hält.Telescope arrangement according to claim 11, characterized in that a spring motor (28) also acts on the hoist winch (21) and keeps the return cable tensioned even when the hydraulic motor (22) is switched off. Teleskopanordnung nach einem der Ansprüche 2 bis 6 und 10 bis 12, dadurch gekennzeichnet, daß sie in einem ebenfalls teleskopartig ausgebildeten Ausleger eines Krans angeordnet ist, wobei jeweils ein Tauchkolbenzylinder (1, 2, 3) mit dem ihm zugeordneten Auslegerelement verbunden ist.Telescopic arrangement according to one of claims 2 to 6 and 10 to 12, characterized in that it is arranged in a telescopic boom of a crane, wherein in each case a plunger cylinder (1, 2, 3) is connected to the boom element assigned to it.
EP93112071A 1992-07-29 1993-07-28 Telescopic system of several plunger-type cylinders, particularly for multistage telescope jibs of cranes or the like Expired - Lifetime EP0581270B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4225032A DE4225032A1 (en) 1992-07-29 1992-07-29 Telescopic arrangement consisting of several plunger cylinders, in particular for telescopic booms on cranes or the like.
DE4225032 1992-07-29

Publications (3)

Publication Number Publication Date
EP0581270A2 true EP0581270A2 (en) 1994-02-02
EP0581270A3 EP0581270A3 (en) 1994-08-31
EP0581270B1 EP0581270B1 (en) 1998-05-20

Family

ID=6464369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112071A Expired - Lifetime EP0581270B1 (en) 1992-07-29 1993-07-28 Telescopic system of several plunger-type cylinders, particularly for multistage telescope jibs of cranes or the like

Country Status (3)

Country Link
EP (1) EP0581270B1 (en)
AT (1) ATE166434T1 (en)
DE (2) DE4225032A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1473466A1 (en) * 2003-05-01 2004-11-03 Logitrans A/S Telescopic cylinder
AT512871A1 (en) * 2012-05-07 2013-11-15 Palfinger Systems Gmbh telescopic arm
CN115507710A (en) * 2022-09-27 2022-12-23 北京星河动力装备科技有限公司 Rocket landing telescopic arm and rocket recovery device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525627A1 (en) * 1995-07-17 1997-01-23 Montan Hydraulik Gmbh & Co Kg Telescoping system with bottom shot and at least two telescopable shots
DE29720972U1 (en) * 1997-11-26 1999-03-25 Ec Engineering + Consulting Spezialmaschinen Gmbh, 89079 Ulm Telescopic boom

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DE1240743B (en) * 1965-02-17 1967-05-18 Toussaint & Hess Gmbh Hydraulic piston drive with telescopic piston
DE2900015A1 (en) * 1979-01-02 1980-07-10 Benteler Werke Ag Constant-rate telescopic cylinder spring device - has valve plug coupled to plunger in chamber connected to outer piston chamber
DE3021633A1 (en) * 1980-06-09 1981-12-17 Schütt, Friedrich, 4755 Holzwickede Multistage telescopic hydraulic ram - has control members in crowns of individual hollow pistons
GB2206929A (en) * 1987-07-10 1989-01-18 Op Pagliero S P A Improvements in or relating to hydraulically operated telescopic devices
DE3835945C1 (en) * 1988-10-21 1990-02-01 Nlw Foerdertechnik Gmbh, 4232 Xanten, De Telescopic cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240743B (en) * 1965-02-17 1967-05-18 Toussaint & Hess Gmbh Hydraulic piston drive with telescopic piston
DE2900015A1 (en) * 1979-01-02 1980-07-10 Benteler Werke Ag Constant-rate telescopic cylinder spring device - has valve plug coupled to plunger in chamber connected to outer piston chamber
DE3021633A1 (en) * 1980-06-09 1981-12-17 Schütt, Friedrich, 4755 Holzwickede Multistage telescopic hydraulic ram - has control members in crowns of individual hollow pistons
GB2206929A (en) * 1987-07-10 1989-01-18 Op Pagliero S P A Improvements in or relating to hydraulically operated telescopic devices
DE3835945C1 (en) * 1988-10-21 1990-02-01 Nlw Foerdertechnik Gmbh, 4232 Xanten, De Telescopic cylinder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1473466A1 (en) * 2003-05-01 2004-11-03 Logitrans A/S Telescopic cylinder
AT512871A1 (en) * 2012-05-07 2013-11-15 Palfinger Systems Gmbh telescopic arm
AT512871B1 (en) * 2012-05-07 2014-08-15 Palfinger Systems Gmbh telescopic arm
CN115507710A (en) * 2022-09-27 2022-12-23 北京星河动力装备科技有限公司 Rocket landing telescopic arm and rocket recovery device
CN115507710B (en) * 2022-09-27 2023-09-05 北京星河动力装备科技有限公司 Rocket landing telescopic arm and rocket recovery device

Also Published As

Publication number Publication date
EP0581270A3 (en) 1994-08-31
ATE166434T1 (en) 1998-06-15
EP0581270B1 (en) 1998-05-20
DE59308566D1 (en) 1998-06-25
DE4225032A1 (en) 1994-02-03

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