EP2536653B1 - Luffing-jib tower crane - Google Patents

Luffing-jib tower crane Download PDF

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Publication number
EP2536653B1
EP2536653B1 EP11704726.6A EP11704726A EP2536653B1 EP 2536653 B1 EP2536653 B1 EP 2536653B1 EP 11704726 A EP11704726 A EP 11704726A EP 2536653 B1 EP2536653 B1 EP 2536653B1
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EP
European Patent Office
Prior art keywords
luffing
angle value
jib
cable
angle
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.)
Active
Application number
EP11704726.6A
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German (de)
French (fr)
Other versions
EP2536653A1 (en
Inventor
Andreas Wagner
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.)
Wolffkran Holding AG
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Wolffkran Holding AG
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Publication date
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Publication of EP2536653A1 publication Critical patent/EP2536653A1/en
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Publication of EP2536653B1 publication Critical patent/EP2536653B1/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
    • B66C23/82—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
    • B66C23/88—Safety gear

Definitions

  • the invention relates to a luffing jib tower crane according to the preamble of claim 1, wherein the boom is held by a Wippseil.
  • a crane is out of the US 4,752,012 known.
  • Tower cranes comprise a crane base from which a tower extends upwards. At an upper portion of the tower, a boom and possibly a counter-jib is attached.
  • a boom is connected to the tower via a joint so that the angle of the boom can be changed to the horizontal plane.
  • the jib is held by a roping rope, the length of which can be changed by winding the rappelling rope on a cable drum of a retraction or unwound.
  • the measured current cantilever angle can be used to calculate the current load on the crane for each crane.
  • the determination of the overhang is particularly important because the mathematical product of load and load may not exceed a maximum value specific to the crane, otherwise there is a risk that the crane overturned.
  • the invention has for its object to provide a luffing jib tower crane available, in which the risks described are avoided.
  • the measurement according to the invention of the length of the unwound part of the seesaw cable makes it possible to calculate a second angle value, which corresponds to the minimum angle of the boom to the horizontal plane for a certain length of the seesaw cable.
  • a second angle value which corresponds to the minimum angle of the boom to the horizontal plane for a certain length of the seesaw cable.
  • For the real angle of the boom may possibly be greater than this second angle value with corresponding winches that push the boom inwards (upwards).
  • the comparison of the two angle values makes it possible to detect deviations. Just as the angle values can be determined continuously, they can also be compared continuously. If a deviation is detected, there is inevitably a fault that needs to be eliminated. Thus, the sensor attached to the boom may be faulty or other components required for the determination of the two angle values may be defective.
  • first angle value is greater than the second angle value
  • another cause that may be considered is that slack rope has formed due to strong wind.
  • the determination of the first angle value is completely independent of the determination of the second angle value, so that disturbances in the components responsible for the Determination of one angle value are required, for determining the other angle value can not influence.
  • the invention proves to be particularly advantageous when the measuring device has a second sensor which measures the rotation of the cable drum of the retraction unit during unwinding and winding.
  • a particularly advantageous embodiment of the invention provides that, when a deviation of the two angle values is detected during the unwinding of the seesaw, the drive of the retracting is switched off.
  • a further particularly advantageous embodiment of the invention provides that when the first angle value deviates from the second angle value, the seesaw cable is wound up until the second angle value coincides with the first angle value.
  • this embodiment it is possible to eliminate a slack rope that has already been formed, because wind pushes the boom inwards (upwards), in which the seesaw rope is shortened to the length corresponding to the real boom angle. In this way, it is excluded that the boom, when the wind subsides, falls outwards (downwards) and is abruptly held by the seesaw rope. In this way dangerous shocks are prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Control And Safety Of Cranes (AREA)

Description

Die Erfindung betrifft einen Wippausleger-Turmkran gemäß dem Oberbegriff des Anspruchs 1, bei dem der Ausleger von einem Wippseil gehalten wird. Ein solcher kran ist aus der US 4 752 012 bekannt.The invention relates to a luffing jib tower crane according to the preamble of claim 1, wherein the boom is held by a Wippseil. Such a crane is out of the US 4,752,012 known.

Turmkrane umfassen eine Kranbasis, von der ausgehend sich ein Turm nach oben erstreckt. An einem oberen Abschnitt des Turms ist ein Ausleger und möglicherweise ein Gegenausleger angebracht. Bei Wippausleger-Turmkranen ist ein Ausleger über ein Gelenk mit dem Turm verbunden, so dass der Winkel des Auslegers zur horizontalen Ebene veränderbar ist. Bei der Bauform von Wippausleger-Turmkranen, auf die sich die vorliegende Erfindung bezieht, wird der Auslegers von einem Wippseil gehalten, dessen Länge verändert werden kann, indem das Wippseil auf eine Seiltrommel eines Einziehwerks aufgespult oder abgespult wird.Tower cranes comprise a crane base from which a tower extends upwards. At an upper portion of the tower, a boom and possibly a counter-jib is attached. In luffing jib tower cranes, a boom is connected to the tower via a joint so that the angle of the boom can be changed to the horizontal plane. In the design of luffing jib tower cranes, to which the present invention relates, the jib is held by a roping rope, the length of which can be changed by winding the rappelling rope on a cable drum of a retraction or unwound.

Bei Wippausleger-Turmkranen ist es bekannt, die Winkel des Auslegers gegen die horizontale Ebene (Auslegerwinkel) mit einem an dem Ausleger angebrachten Sensor zu messen. Die Funktionsweise eines solchen Sensors kann beispielsweise darin bestehen, dass ein aufgrund der Schwerkraft vertikal nach unten hängendes Pendel auf einen veränderlichen elektrischen Widerstand wirkt, dessen Widerstandswert mittels elektronischer Datenverarbeitung in den Auslegerwinkel umgerechnet wird.With luffing jib tower cranes, it is known to measure the angle of the boom against the horizontal plane (boom angle) with a sensor attached to the boom. The mode of operation of such a sensor can be, for example, that a pendulum hanging down vertically due to gravity acts on a variable electrical resistance whose resistance value is converted into the boom angle by means of electronic data processing.

Der gemessene aktuelle Auslegerwinkel kann dazu verwendet werden, für den jeweiligen Kran die aktuelle Ausladung der Last zu errechnen. Die Bestimmung der Ausladung ist insbesondere deshalb von Bedeutung, weil das mathematische Produkt aus Ausladung und Last einen für den jeweiligen Kran spezifischen Maximalwert nicht überschreiten darf, da anderenfalls die Gefahr besteht, dass der Kran umstürzt.The measured current cantilever angle can be used to calculate the current load on the crane for each crane. The determination of the overhang is particularly important because the mathematical product of load and load may not exceed a maximum value specific to the crane, otherwise there is a risk that the crane overturned.

Bei bekannten Wippausleger-Turmdrehkranen besteht das Risiko, dass Wind so stark und in solcher Richtung gegen den Ausleger bläst, dass die durch den Wind verursachte Kraft, die den Ausleger in Richtung Turm (nach innen) drückt größer ist als der Schwerkraftanteil, der den Ausleger vom Turm weg (nach außen) zieht. Wird in einer solchen Situation das Wippseil verlängert, indem es von der Seiltrommel des Einziehwerks abgespult wird, bewegt sich der Ausleger nicht nach außen, d.h. der Auslegerwinkel verkleinert sich nicht. Es bildet sich Schlaffseil. Lässt der Wind zu einem späteren Zeitpunkt nach, kann der Ausleger nach außen fallen, bis ihn das sich straffende Wippseil abrupt festhält. Die dabei entstehenden Erschütterungen können zu schweren Beschädigungen und Unfällen führen.In known luffing jib tower cranes there is a risk that wind will blow so strongly and in such a direction against the boom that the force caused by the wind, which pushes the boom in the direction of the tower (inwards), is greater than the gravity portion of the boom away from the tower (outwards). If, in such a situation, the seesaw cable is extended by being removed from the cable drum of the Uncoiler is unwound, the boom does not move outwards, ie the boom angle does not shrink. It forms slack rope. If the wind slows down at a later time, the boom can fall outwards until the tightening seesaw rope stops abruptly. The resulting vibrations can lead to serious damage and accidents.

Bei bekannten Wippausleger-Turmkranen besteht darüber hinaus trotz der beschriebenen Messung des Auslegerwinkels mittels eines am Ausleger angebrachten Sensors das Risiko, dass der Maximalwert für das Produkt aus Ausladung und Last überschritten wird, wenn die Messung des Auslegerwinkels wegen eines Gerätesfehlers fehlerhaft ist.In addition, in the case of known luffing jib tower cranes, despite the described measurement of the boom angle by means of a sensor mounted on the boom, there is the risk that the maximum value for the product of reach and load will be exceeded if the measurement of the boom angle is erroneous due to a device error.

Der Erfindung liegt die Aufgabe zugrunde, einen Wippausleger-Turmkran zur Verfügung zu stellen, bei dem die beschriebenen Risiken vermieden werden.The invention has for its object to provide a luffing jib tower crane available, in which the risks described are avoided.

Diese Aufgabe wird durch einen Wippausleger-Turmkran mit den im Patentanspruch 1 bezeichneten Merkmalen gelöst. Weitere Ausführungsformen sind Gegenstand der Unteransprüche oder nachfolgend beschrieben.This object is achieved by a luffing jib tower crane with the features specified in claim 1. Further embodiments are the subject matter of the subclaims or described below.

Die erfindungsgemäße Messung der Länge des abgespulten Teils des Wippseils ermöglicht die Berechnung eines zweiten Winkelwerts, der dem bei einer bestimmten Länge des Wippseils minimalen Winkel des Auslegers zur horizontalen Ebene entspricht. Denn der reale Winkel des Auslegers kann bei entsprechenden Winden, die den Ausleger nach innen (nach oben) drücken, möglicherweise größer sein als dieser zweite Winkelwert. Der Vergleich der beiden Winkelwerte ermöglicht die Feststellung von Abweichungen. Ebenso wie die Winkelwerte kontinuierlich ermittelt werden können, können sie auch kontinuierlich verglichen werden. Wird eine Abweichung festgestellt, liegt zwangsläufig eine Störung vor, die beseitigt werden muss. So kann der am Ausleger angebrachte Sensor fehlerhaft sein oder sonstige für die Bestimmung der beiden Winkelwerte erforderliche Komponenten defekt sein. Ist der erste Winkelwert größer als der zweite Winkelwert, so kommt als weitere Ursache in Betracht, dass sich aufgrund starken Windes Schlaffseil gebildet hat. Die Bestimmung des ersten Winkelwerts ist völlig unabhängig von der Bestimmung des zweiten Winkelwerts, so dass Störungen in den Komponenten, die für die Bestimmung des einen Winkelwerts erforderlich sind, für Bestimmung des anderen Winkelwerts nicht beeinflussen können.The measurement according to the invention of the length of the unwound part of the seesaw cable makes it possible to calculate a second angle value, which corresponds to the minimum angle of the boom to the horizontal plane for a certain length of the seesaw cable. For the real angle of the boom may possibly be greater than this second angle value with corresponding winches that push the boom inwards (upwards). The comparison of the two angle values makes it possible to detect deviations. Just as the angle values can be determined continuously, they can also be compared continuously. If a deviation is detected, there is inevitably a fault that needs to be eliminated. Thus, the sensor attached to the boom may be faulty or other components required for the determination of the two angle values may be defective. If the first angle value is greater than the second angle value, another cause that may be considered is that slack rope has formed due to strong wind. The determination of the first angle value is completely independent of the determination of the second angle value, so that disturbances in the components responsible for the Determination of one angle value are required, for determining the other angle value can not influence.

Als besonders vorteilhaft erweist sich die Erfindung, wenn die Messvorrichtung einen zweiten Sensor aufweist, der die Drehung der Seiltrommel des Einziehwerks beim Abspulen und Aufspulen misst.The invention proves to be particularly advantageous when the measuring device has a second sensor which measures the rotation of the cable drum of the retraction unit during unwinding and winding.

Eine besonders vorteilhafte Ausführungsform der Erfindung sieht vor, dass, wenn während des Abspulens des Wippseils eine Abweichung der beiden Winkelwerte festgestellt wird, der Antrieb des Einziehwerks abgeschaltet wird.A particularly advantageous embodiment of the invention provides that, when a deviation of the two angle values is detected during the unwinding of the seesaw, the drive of the retracting is switched off.

Eine weitere besonders vorteilhafte Ausführungsform der Erfindung sieht vor, dass bei Abweichung des ersten Winkelwerts vom zweiten Winkelwert das Wippseil so weit aufgespult wird, bis der zweite Winkelwert mit dem ersten Winkelwert übereinstimmt. Bei dieser Ausführungsform wird ermöglicht, ein Schlaffseil, das sich bereits gebildet hat, weil Wind den Ausleger nach innen (nach oben) drückt, wieder zu beseitigen, in dem das Wippseil auf die Länge verkürzt wird, die dem realen Auslegerwinkel entspricht. Auf diese Weise wird ausgeschlossen, dass der Ausleger, wenn der Wind nachlässt, nach außen (nach unten) fällt und abrupt vom Wippseil festgehalten wird. Auf diese Weise werden gefährliche Erschütterungen verhindert.A further particularly advantageous embodiment of the invention provides that when the first angle value deviates from the second angle value, the seesaw cable is wound up until the second angle value coincides with the first angle value. In this embodiment, it is possible to eliminate a slack rope that has already been formed, because wind pushes the boom inwards (upwards), in which the seesaw rope is shortened to the length corresponding to the real boom angle. In this way, it is excluded that the boom, when the wind subsides, falls outwards (downwards) and is abruptly held by the seesaw rope. In this way dangerous shocks are prevented.

Claims (4)

  1. Tower crane with luffing jib, comprising a tower and a jib linked to the tower by means of a hinge assembly that is held in its position by means of a luffing cable, where the length of the luffing cable can be changed by means of an elevation system and where the luffing cable is wound onto, or paid out from the cable drum of the luffing gear, and where the angle the jib makes with the horizontal is measured by means of a first sensor attached to the jib (first angle value),
    characterised in that
    a measuring device measures the length of the part of the luffing cable that has been paid out, from which the minimum angle value of the jib relative to the horizontal (second angle value) can be calculated, after which it is possible to compare the first angle value with the second angle value.
  2. Tower crane with luffing jib in accordance with Claim 1, characterised in that the measuring device has a second sensor which measures the amount by which the cable drum of the luffing gear is rotated during paying out and winding back of the cable.
  3. Tower crane with luffing jib in accordance with one of the preceding Claims, characterised in that the drive of the winding gear is switched off if the first angle value and the second angle value differ from one another.
  4. Tower crane with luffing jib in accordance with one of Claims 1 or 2, characterised in that, should the first angle value differ from the second angle value, the luffing cable is wound back on to the drum until the second angle value coincides with the first angle value.
EP11704726.6A 2010-02-16 2011-02-16 Luffing-jib tower crane Active EP2536653B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010008155A DE102010008155B4 (en) 2010-02-16 2010-02-16 Luffing jib tower crane
PCT/EP2011/000742 WO2011101133A1 (en) 2010-02-16 2011-02-16 Luffing-jib tower crane

Publications (2)

Publication Number Publication Date
EP2536653A1 EP2536653A1 (en) 2012-12-26
EP2536653B1 true EP2536653B1 (en) 2013-07-24

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EP11704726.6A Active EP2536653B1 (en) 2010-02-16 2011-02-16 Luffing-jib tower crane

Country Status (10)

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US (1) US8955702B2 (en)
EP (1) EP2536653B1 (en)
AU (1) AU2011217550B2 (en)
BR (1) BR112012020590B1 (en)
CA (1) CA2789924C (en)
DE (1) DE102010008155B4 (en)
ES (1) ES2431628T3 (en)
RU (1) RU2521445C2 (en)
SG (1) SG183348A1 (en)
WO (1) WO2011101133A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012010759A1 (en) 2012-05-31 2013-12-05 Wolffkran Holding Ag Electrohydraulic device for adjusting a boom
JP6121663B2 (en) 2012-07-10 2017-04-26 株式会社タダノ Work vehicle
FR3071489A1 (en) * 2017-09-28 2019-03-29 Manitowoc Crane Group France METHOD FOR SECURING A CRANE ARROW CRANE AND ASSOCIATED CRANE

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US3833130A (en) * 1973-04-20 1974-09-03 Krupp Gmbh Safety device for a top boom pivotally mounted on a crane boom
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GB2012719B (en) * 1978-01-19 1982-02-17 Priestman Bros Ltd Crane safety device
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SU1337340A1 (en) * 1984-12-29 1987-09-15 Головное Специальное Конструкторско-Технологическое Бюро Краностроения Производственного Объединения "Автокран" Boom crane cargo capacity limiter
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RU2021968C1 (en) * 1990-08-08 1994-10-30 Кустанайский сельскохозяйственный институт Crane boom mechanism
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DE202004009782U1 (en) * 2004-06-22 2005-11-03 Liebherr-Werk Ehingen Gmbh Crane lattice jib and crane
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US7367464B1 (en) * 2007-01-30 2008-05-06 The United States Of America As Represented By The Secretary Of The Navy Pendulation control system with active rider block tagline system for shipboard cranes

Also Published As

Publication number Publication date
DE102010008155A1 (en) 2011-08-18
RU2012138301A (en) 2014-03-27
ES2431628T3 (en) 2013-11-27
WO2011101133A1 (en) 2011-08-25
DE102010008155B4 (en) 2013-02-28
BR112012020590A2 (en) 2016-07-19
US20130062301A1 (en) 2013-03-14
AU2011217550B2 (en) 2014-08-21
RU2521445C2 (en) 2014-06-27
AU2011217550A1 (en) 2012-09-06
BR112012020590B1 (en) 2020-06-16
CA2789924A1 (en) 2011-08-25
US8955702B2 (en) 2015-02-17
CA2789924C (en) 2015-04-14
EP2536653A1 (en) 2012-12-26
SG183348A1 (en) 2012-09-27

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