EP2396265B1 - Traction rod for bracing a crane jib - Google Patents

Traction rod for bracing a crane jib Download PDF

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Publication number
EP2396265B1
EP2396265B1 EP10708097A EP10708097A EP2396265B1 EP 2396265 B1 EP2396265 B1 EP 2396265B1 EP 10708097 A EP10708097 A EP 10708097A EP 10708097 A EP10708097 A EP 10708097A EP 2396265 B1 EP2396265 B1 EP 2396265B1
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EP
European Patent Office
Prior art keywords
tubular body
coupling elements
connecting rod
wall
bracing
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.)
Not-in-force
Application number
EP10708097A
Other languages
German (de)
French (fr)
Other versions
EP2396265A1 (en
Inventor
Thomas Müller
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.)
Vallourec Deutschland GmbH
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V&M Deutschland GmbH
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Filing date
Publication date
Application filed by V&M Deutschland GmbH filed Critical V&M Deutschland GmbH
Publication of EP2396265A1 publication Critical patent/EP2396265A1/en
Application granted granted Critical
Publication of EP2396265B1 publication Critical patent/EP2396265B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B66C23/82—Luffing gear
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32606—Pivoted

Definitions

  • the invention relates to a pull rod for the bracing of a crane boom according to the preamble of claim 1.
  • Cranes with crane jibs are z. B. from the DE 20 2008 006 167 U1 known.
  • the crane jibs are here with rope-shaped or from single, articulated interconnected rod-shaped elements braced.
  • a disadvantage of welded tie rods is that the welded joints between the pipe and coupling element have an increased notch sensitivity and are therefore subject to increased fatigue crack susceptibility in the weld seam area.
  • the fatigue strength of such tie rods is thus significantly limited, which leads to high costs due to premature failure.
  • the object of the invention is to provide a pull rod for bracing a crane jib, which does not have the disadvantages described and is inexpensive to produce.
  • tubular body and coupling elements of a one-piece pipe section wherein the coupling elements are each designed as a wall thickening of the ends of the tubular body, which are dimensioned so that a to be considered for the calculation of the sustainability of the tubular body cross-sectional weakening of the nominal wall thickness of the coupling elements in the field the bolt connection is avoided and the transition areas of the respective wall thickening to the tubular body to increase the fatigue strength have a ropeless transition.
  • the wall thickening can be achieved by an enlarged outer diameter and / or by a reduced inner diameter.
  • tie rod according to the invention is that on the one hand the production is much cheaper due to the one-piece design, on the other hand a significantly improved fatigue strength of the drawbar is achieved by the computationally full load capacity of the pipe cross-section in the bolt connection.
  • the wall thickening is produced in a first advantageous variant of the method by upsetting in particular by hot upsetting of the pipe end.
  • the upsetting process is advantageously carried out so that the transitions generated during compression from the pipe to the coupling piece as free of lumps and kerbarm are performed.
  • the transitions have the largest possible radius. If necessary, these transitions can also be generated by mechanical processing.
  • transitions lead to a flowing and notch-free transition to the non-thickened region of the tube. This advantageously ensures a low stress concentration factor in the transition zone.
  • the pull rod 1 consists of a tubular body 2, whose ends have coupling elements 3, which are designed according to the invention as a wall thickening of the tube.
  • the wall thickening is performed with an enlarged outer diameter, but it is also possible to realize the wall thickening by a reduced inner diameter.
  • transitions 7 of the wall thickening to the tubular body 2 are inventively ropeless and kerbarm executed to achieve the highest possible fatigue strength of the drawbar in operation.
  • the coupling elements 3 are each provided with holes 4, so that the tie rods are mutually chain link-like and articulated connectable.
  • bolts 5 are inserted with excess length in the holes 4, so that the both sides of the coupling element 3 protruding ends are connected by means of securing straps 6 and secured against loosening.

Description

Die Erfindung betrifft eine Zugstange für die Abspannung eines Kranauslegers gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a pull rod for the bracing of a crane boom according to the preamble of claim 1.

Kräne mit Kranauslegern sind z. B. aus der DE 20 2008 006 167 U1 bekannt. Die Kranausleger sind hier mit seilförmigen oder aus einzelnen, gelenkig miteinander verbundenen stangenförmigen Elementen abspannbar.Cranes with crane jibs are z. B. from the DE 20 2008 006 167 U1 known. The crane jibs are here with rope-shaped or from single, articulated interconnected rod-shaped elements braced.

Bei stangenförmigen als Zugstange ausgeführten Elementen ist es bekannt, diese aus Rohrstücken mit an den Enden angeschweißten, gabelförmigen Endstücken als Kupplungselement auszuführen. Die einzelnen Zugstangen werden dann an den gabelförmigen Endstücken mittels einer Bolzenverbindung gelenkig in der erforderlichen Länge miteinander verkuppelt.In the case of rod-shaped elements designed as drawbars, it is known to carry them out of pipe sections with fork-shaped end pieces welded at the ends as a coupling element. The individual tie rods are then verkuppelt each other at the fork-shaped end pieces by means of a bolt connection in the required length.

Derartige beispielsweise als Gittermastkrane ausgeführten Krane, unterliegen im laufenden Betrieb hohen dynamischen Beanspruchungen, die auch auf die Zugstangen der Abspannung einwirken.Such as running as a lattice cranes cranes are subject to high dynamic stresses during operation, which also act on the tie rods of the bracing.

Nachteilig bei geschweißten Zugstangen ist, dass die Schweißverbindungen zwischen Rohr und Kupplungselement eine erhöhte Kerbempfindlichkeit aufweisen und deshalb einer erhöhten Ermüdungsrissanfälligkeit im Schweißnahtbereich unterliegen. Die Dauerfestigkeit derartiger Zugstangen ist dadurch deutlich eingeschränkt, was zu hohen Kosten durch frühzeitigen Ausfall führt.A disadvantage of welded tie rods is that the welded joints between the pipe and coupling element have an increased notch sensitivity and are therefore subject to increased fatigue crack susceptibility in the weld seam area. The fatigue strength of such tie rods is thus significantly limited, which leads to high costs due to premature failure.

Aufgabe der Erfindung ist es, eine Zugstange für die Abspannung eines Kranauslegers anzugeben, die die beschriebenen Nachteile nicht aufweist und kostengünstig herstellbar ist.The object of the invention is to provide a pull rod for bracing a crane jib, which does not have the disadvantages described and is inexpensive to produce.

Diese Aufgabe wird nach dem Oberbegriff in Verbindung mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind Gegenstand von Unteransprüchen.This object is achieved according to the preamble in conjunction with the characterizing features of claim 1. Advantageous developments are the subject of dependent claims.

Nach der Lehre der Erfindung bestehen Rohrkörper und Kupplungselemente aus einem einteiligen Rohrabschnitt, wobei die Kupplungselemente jeweils als Wandverdickung der Enden des Rohrkörpers ausgeführt sind, die so bemessen sind, dass eine für die Berechnung der Tragfähigkeit des Rohrkörpers zu berücksichtigende Querschnittsschwächung der Nennwanddicke der Kupplungselemente im Bereich der Bolzenverbindung vermieden wird und die Übergangsbereiche der jeweiligen Wandverdickungen zum Rohrkörper zur Steigerung der Dauerfestigkeit einen ansatzfreien Übergang aufweisen.According to the teachings of the invention, tubular body and coupling elements of a one-piece pipe section, wherein the coupling elements are each designed as a wall thickening of the ends of the tubular body, which are dimensioned so that a to be considered for the calculation of the sustainability of the tubular body cross-sectional weakening of the nominal wall thickness of the coupling elements in the field the bolt connection is avoided and the transition areas of the respective wall thickening to the tubular body to increase the fatigue strength have a ropeless transition.

Erfindungsgemäß kann die Wandverdickung durch einen vergrößerten Außendurchmesser und/oder durch einen verringerten Innendurchmesser erreicht werden.According to the invention, the wall thickening can be achieved by an enlarged outer diameter and / or by a reduced inner diameter.

Der Vorteil der erfindungsgemäßen Zugstange besteht darin, dass einerseits die Herstellung aufgrund der einteiligen Ausführung wesentlich kostengünstiger ist, andererseits durch die rechnerisch volle Tragfähigkeit des Rohrquerschnitts im Bereich der Bolzenverbindung eine deutlich verbesserte Dauerfestigkeit der Zugstange erreicht wird.The advantage of the tie rod according to the invention is that on the one hand the production is much cheaper due to the one-piece design, on the other hand a significantly improved fatigue strength of the drawbar is achieved by the computationally full load capacity of the pipe cross-section in the bolt connection.

Erfindungsgemäß wird die Wandverdickung in einer ersten vorteilhaften Verfahrensvariante durch ein Aufstauchen insbesondere durch Warmstauchen des Rohrendes erzeugt.According to the invention, the wall thickening is produced in a first advantageous variant of the method by upsetting in particular by hot upsetting of the pipe end.

Der Stauchvorgang wird dabei vorteilhaft so ausgeführt, dass die beim Stauchen erzeugten Übergänge vom Rohr zum Kupplungsstück möglichst ansatzfrei und kerbarm ausgeführt werden. Hierzu weisen die Übergänge einen möglichst größen Radius auf. Falls erforderlich, können diese Übergänge auch durch eine mechanische Bearbeitung erzeugt werden.The upsetting process is advantageously carried out so that the transitions generated during compression from the pipe to the coupling piece as free of lumps and kerbarm are performed. For this purpose, the transitions have the largest possible radius. If necessary, these transitions can also be generated by mechanical processing.

Die derart gestalteten Übergänge führen zu einem fließenden und kerbfreien Übergang zum nicht verdickten Bereich des Rohres. Hierdurch wird vorteilhaft in der Übergangszone ein niedriger Spannungskonzentrationsfaktor gewährleistet.The thus designed transitions lead to a flowing and notch-free transition to the non-thickened region of the tube. This advantageously ensures a low stress concentration factor in the transition zone.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung ist es auch möglich, die Wandverdickung des Rohrendes durch eine Auftragsschweißung oder durch Aufsintern zu realisieren und anschließend mechanisch zu bearbeiten.According to a further advantageous embodiment of the invention, it is also possible to realize the wall thickening of the pipe end by a build-up welding or by sintering and then to work mechanically.

Bei den vorgenannten Verfahrensvarianten wird die Erzeugung der Wandverdickung des Rohrkörpers vollständig vom Walzprozess abgekoppelt. Dies hat den Vorteil, dass Rohre, z. B. Lagerrohre, die ursprünglich nicht für den beschriebenen Einsatzzweck vorgesehen waren, nachträglich mit einer Wandverdickung und einer entsprechenden mechanischen Bearbeitung versehen werden können.In the aforementioned method variants, the generation of the wall thickening of the tubular body is completely decoupled from the rolling process. This has the advantage that pipes, z. B. bearing tubes, which were not originally intended for the application described, can be subsequently provided with a wall thickening and a corresponding mechanical processing.

Es ist außerdem möglich, die Rohrendenverdickung bereits bei der Herstellung des warmgewalzten nahtlosen Rohres zu erzeugen, wenn es aus fertigungstechnischer Sicht vorteilhafter erscheint. Beispielsweise wird durch ein Auseinanderfahren der Walzen am Rohrende ein vergrößerter Außendurchmesser erzeugt und ein vergrößerter Innendurchmesser z. B. durch ein entsprechend konstruiertes Innenwerkzeug.It is also possible to produce the pipe end thickening already in the production of the hot-rolled seamless pipe, if it appears more advantageous from a production point of view. For example, by moving apart of the rollers at the end of the tube produces an enlarged outer diameter and an enlarged inner diameter z. B. by a correspondingly constructed inner tool.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung der schematischen Darstellung eines Ausführungsbeispiels.Further features, advantages and details of the invention will become apparent from the following description of the schematic representation of an embodiment.

In der dargestellten Figur sind die jeweiligen Enden einer erfindungsgemäßen Zugstange dargestellt.In the illustrated figure, the respective ends of a pull rod according to the invention are shown.

Die Zugstange 1 besteht aus einem Rohrkörper 2, dessen Enden Kupplungselemente 3 aufweisen, die erfindungsgemäß als eine Wandverdickung des Rohres ausgeführt sind. In diesem Beispiel ist die Wandverdickung mit einem vergrößerten Außendurchmesser ausgeführt, es ist jedoch auch möglich die Wandverdickung durch einen reduzierten Innendurchmesser zu realisieren.The pull rod 1 consists of a tubular body 2, whose ends have coupling elements 3, which are designed according to the invention as a wall thickening of the tube. In this example, the wall thickening is performed with an enlarged outer diameter, but it is also possible to realize the wall thickening by a reduced inner diameter.

Die Übergänge 7 von der Wandverdickung zum Rohrkörper 2 sind erfindungsgemäß ansatzfrei und kerbarm ausgeführt, um eine möglichst hohe Dauerfestigkeit der Zugstange im Betrieb zu erreichen.The transitions 7 of the wall thickening to the tubular body 2 are inventively ropeless and kerbarm executed to achieve the highest possible fatigue strength of the drawbar in operation.

Die Kupplungselemente 3 sind jeweils mit Bohrungen 4 versehen, so dass die Zugstangen untereinander kettengliedartig und gelenkig verbindbar sind. Hierzu sind in die Bohrungen 4 Bolzen 5 mit Überlänge eingeschoben, so dass die beidseitig aus dem Kupplungselement 3 hervorstehenden Enden mittels Sicherungslaschen 6 verbunden und gegen Lösen gesichert sind.The coupling elements 3 are each provided with holes 4, so that the tie rods are mutually chain link-like and articulated connectable. For this purpose, bolts 5 are inserted with excess length in the holes 4, so that the both sides of the coupling element 3 protruding ends are connected by means of securing straps 6 and secured against loosening.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

Nr.No. Bezeichnungdescription 11 Zugstangepull bar 22 Rohrkörperpipe body 33 Kupplungselementcoupling member 44 Bohrungdrilling 55 Bolzenbolt 66 Sicherungslaschesecuring tab 77 Übergangcrossing

Claims (4)

  1. A connecting rod for bracing a crane jib, consisting of a metallic tubular body (2), and coupling elements (3) connected thereto at both ends for articulated connection together of the connecting rods by means of bolts,
    characterised in that
    the tubular body (2) and the coupling elements (3) consist of a one-piece tube section, the coupling elements (3) being embodied in each case as a wall thickening of the ends of the tubular body (2), which are calculated such that a weakening of the cross-section of the nominal wall thickness of the coupling elements (3), which has to be taken into account for calculating the load-bearing capacity of the tubular body (2), in the region of the bolt connection is avoided, and the transition regions of the respective wall thickenings to the tubular body have a step-free transition (7) in order to increase the fatigue strength.
  2. A connecting rod according to Claim 1, characterised in that the wall thickenings are enlargements of the external diameter and/or reductions of the internal diameter of the tubular body (2).
  3. A connecting rod according to Claim 2, characterised in that the wall thickenings are tube ends which have been upset by hot upsetting.
  4. A connecting rod according to Claims 1 and 2, characterised in that the wall thickenings are tube ends which have been thickened by deposit welding.
EP10708097A 2009-02-11 2010-02-05 Traction rod for bracing a crane jib Not-in-force EP2396265B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009008809A DE102009008809A1 (en) 2009-02-11 2009-02-11 Drawbar for the bracing of a crane jib
PCT/DE2010/000180 WO2010091678A1 (en) 2009-02-11 2010-02-05 Traction rod for bracing a crane jib

Publications (2)

Publication Number Publication Date
EP2396265A1 EP2396265A1 (en) 2011-12-21
EP2396265B1 true EP2396265B1 (en) 2013-04-03

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ID=42199583

Family Applications (1)

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EP10708097A Not-in-force EP2396265B1 (en) 2009-02-11 2010-02-05 Traction rod for bracing a crane jib

Country Status (8)

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US (1) US8701903B2 (en)
EP (1) EP2396265B1 (en)
JP (1) JP5690746B2 (en)
KR (1) KR101721891B1 (en)
CN (1) CN102325716B (en)
AR (1) AR075389A1 (en)
DE (1) DE102009008809A1 (en)
WO (1) WO2010091678A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102014216674A1 (en) * 2014-08-21 2016-02-25 Schaeffler Technologies AG & Co. KG Tubular component and method for its production

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DE202010017053U1 (en) 2010-12-24 2012-04-03 Geo. Gleistein & Sohn Gmbh Tensioning element and intermediate product of numerous braided, beaten (twisted) or largely parallel synthetic fibers
CN102337724A (en) * 2011-08-02 2012-02-01 巨力索具股份有限公司 Steel pull rod
DE202013003309U1 (en) * 2013-04-08 2014-07-09 Liebherr-Werk Biberach Gmbh crane

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Also Published As

Publication number Publication date
DE102009008809A1 (en) 2010-08-19
EP2396265A1 (en) 2011-12-21
US20120037584A1 (en) 2012-02-16
KR101721891B1 (en) 2017-03-31
JP2012517393A (en) 2012-08-02
WO2010091678A1 (en) 2010-08-19
JP5690746B2 (en) 2015-03-25
CN102325716A (en) 2012-01-18
US8701903B2 (en) 2014-04-22
CN102325716B (en) 2014-07-23
KR20110118795A (en) 2011-11-01
AR075389A1 (en) 2011-03-30

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