EP2123589B1 - Determination and reconstruction of load changes in lifting devices - Google Patents

Determination and reconstruction of load changes in lifting devices Download PDF

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Publication number
EP2123589B1
EP2123589B1 EP09159387.1A EP09159387A EP2123589B1 EP 2123589 B1 EP2123589 B1 EP 2123589B1 EP 09159387 A EP09159387 A EP 09159387A EP 2123589 B1 EP2123589 B1 EP 2123589B1
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Prior art keywords
load
changes
gradient
determined
data
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German (de)
French (fr)
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EP2123589A1 (en
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Thomas Heidrich
Hasko Karge
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Manitowoc Crane Group France SAS
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Manitowoc Crane Group France SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/16—Applications of indicating, registering, or weighing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services

Definitions

  • the invention relates to the determination and reconstruction of load changes to lifting equipment.
  • it relates to the field of hoists used on cranes, especially mobile cranes, and also to the hoist as a whole (e.g., crane / mobile crane), as well as the components directly or indirectly affected by the load change.
  • the determination and reconstruction of load changes is generally used to log the operation of the hoist. This finds e.g. Application in accident reconstruction or usage-based invoicing. Furthermore, this information forms the basis for calculating the structural load of the hoist.
  • Such load changes are generally based on the recognition of load absorption and load settling according to the prior art.
  • This load change detection is done with the help of additional information such as control functions that can be expected to raise or lower a load. If recorded load curves now have to be subdivided for evaluation, this subdivision is done on the basis of such additional information (control information) or by external events, such as the bypassing of a safety device.
  • additional information control information
  • external events such as the bypassing of a safety device.
  • the data sets generated in this way are usually stored in a data logger with the aim of subsequently recording load cases and reconstructing them as needed.
  • a method and system for measuring load on a crane hoist are known.
  • the method at least the crane hoist speed and moment are measured and filtered, and the measured and filtered values are compared with each other and a previously determined load value to determine an error value and determine a new measured load value based on this error value.
  • From the EP 0 737 851 A2 is a continuous measurement of the load of lifting and towing devices of hoists known. In this case, the maximum load range is divided into a plurality of load ranges. Then the time is measured in each case, in which the device is exposed to a load range, these times are added and deduced therefrom on the remaining life of the device.
  • a reliable reconstruction of the load cases should be made possible so that calculations based on this can be optimized.
  • a load change at a transition point of the load profile gradient is determined in load profile data. Furthermore, the load curve at the transition points is subdivided into discrete-time viewing intervals.
  • the present invention discloses a novel method for subdividing load histories, wherein at the transition points a memory pulse is generated as a load change event in the course of load.
  • the viewing intervals generated in this way enable the generation of data-reduced information, from which subsequently any continuous-time load profiles can be reconstructed, since they do not relate to the detection of the pickup and the setting down of a load.
  • the use of the load gradient gradient makes it possible to carry out an optimized subdivision and thus evaluation with information that is inherent in the load history, that is, does not have to be determined separately.
  • the determination according to the method according to the invention can be carried out on the basis of stored load profile data, but also on the basis of real-time load profile data.
  • the load history is recorded, ie stored, and at transition points, a memory pulse is generated or entered as a load change indication or load change event in the course of load.
  • the elimination criterion can be, in particular, a time criterion (for example, too short interval) or a criterion that takes into account external influences on the load profile (external events, control information).
  • the transition point can be determined or entered as a load history transition in the load history, when the load gradient gradient changes the sign or changes to zero. Furthermore, a transition point can then be detected or entered if the gradient is changed consecutively more than once with the same sign, that is, if the load curve continues to rise or fall, but the slope of the curve changes.
  • the invention further relates, in a somewhat more extensive aspect, to a method for the reconstruction of load cases on hoists, in which a method is used to determine the load changes, as described above in various embodiments.
  • a method is used to determine the load changes, as described above in various embodiments.
  • other load changes can be taken into account, which come from operating data of the hoist or were determined to special operating cases.
  • the present invention may also be characterized as disclosing a method for analyzing load changes on lifting gear for evaluating and reconstructing load cases which is not based mainly or not exclusively on the basis of the detection of lift start and lift end.
  • An evaluation device divides the course of the load into time-discrete viewing intervals, and each load change can be used to subdivide an evaluation interval.
  • the subdivision (load change event) is due to gradient changes in the load curve, and specifically, temporally offset load changes with the same gradient sign can also be used to subdivide the evaluation interval.
  • the Fig. 2b shows here according to the invention a (compared to the Fig. 2a ) greater subdivision of the load profile, taking into account the corresponding gradient changes.
  • a gradient is thus formed, and from the sweeps of the load gradient, a memory pulse is generated correspondingly, namely at the respective event (transition).
  • the data used for this purpose are stored or real-time recorded data, which contain direct or indirect information about the current load on the hoist.
  • the method according to the invention allows the reconstruction of time-continuous load changes basically independent of the detection of a load pick-up or a load release and thus also allows the reconstruction of loads that change during a stroke.
  • FIG. 1 the load gradient detection and the sequence of events just mentioned above are shown in the upper part, whereby the information about the load gradient as well as about the events during operation is evaluated and stored as a memory pulse in the data memory. This stores raw data or processed data whose validity range is between a previous memory pulse and a new memory pulse.
  • the Fig. 1 shows that data originating from the operation of the hoist can be processed and additionally used as an input data record for the data memory. Together with the data obtained in accordance with the invention (evaluated gradient detection), this system then requires a higher amount of data to be stored, but allows a more detailed reconstruction of any load profiles as a function of the stored data. In addition, a statistical evaluation of the generated viewing intervals can be used to calculate the structural stress of the hoist and to evaluate it during the reconstruction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Tourism & Hospitality (AREA)
  • Strategic Management (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Human Resources & Organizations (AREA)
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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Business, Economics & Management (AREA)
  • Economics (AREA)
  • Theoretical Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control And Safety Of Cranes (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Jib Cranes (AREA)

Abstract

The method involves determining change in load on lifting gear based on load curve data at transition point of gradient of load curve plotted using data of load on lifting gear. The load curve is segmented into discrete-time observation intervals at the transition points based on changes in gradient.

Description

Die Erfindung betrifft die Bestimmung und Rekonstruktion von Laständerungen an Hebezeugen. Insbesondere betrifft sie das Gebiet der Hebezeuge, die an Kranen, speziell Mobilkranen verwendet werden und auch das Hebezeug als Ganzes (z.B. Kran/Mobilkran), sowie die Komponenten die von dem Lastwechsel direkt oder indirekt betroffen sind.The invention relates to the determination and reconstruction of load changes to lifting equipment. In particular, it relates to the field of hoists used on cranes, especially mobile cranes, and also to the hoist as a whole (e.g., crane / mobile crane), as well as the components directly or indirectly affected by the load change.

Die Bestimmung und Rekonstruktion von Laständerungen dient im Allgemeinen der Protokollierung des Betriebes des Hebezeugs. Dieses findet z.B. Anwendung in der Unfallrekonstruktion oder bei einer nutzungsbasierten Rechnungsstellung. Ferner bilden diese Informationen die Grundlage zur Berechnung der strukturellen Beanspruchung des Hebezeugs.The determination and reconstruction of load changes is generally used to log the operation of the hoist. This finds e.g. Application in accident reconstruction or usage-based invoicing. Furthermore, this information forms the basis for calculating the structural load of the hoist.

Derartige Lastwechsel beruhen im Allgemeinen gemäß dem Stand der Technik auf einer Erkennung von Lastaufnahme und Lastabsetzen. Diese Laständerungs-Erkennung geschieht unter Zuhilfenahme von Zusatzinformationen wie z.B. Ansteuerungsfunktionen, die ein Heben oder Senken einer Last erwarten lassen. Wenn nun aufgezeichnete Lastkurven zur Auswertung unterteilt werden müssen, geschieht diese Unterteilung anhand solcher Zusatzinformationen (Ansteuerungsinformationen) oder durch äußere Ereignisse, wie z.B. das Überbrücken einer Sicherheitseinrichtung. Dabei wird insbesondere davon ausgegangen, dass einer Lastaufnahme zwangsläufig ein Lastabsetzen folgt und umgekehrt. Die so erzeugten Datensätze werden in der Regel in einem Datenlogger gespeichert, mit dem Ziel nachträglich Lastfälle zu erfassen und diese bei Bedarf zu rekonstruieren. Diese Verfahren gemäß dem Stand der Technik erlauben zwar die zeitdiskrete Betrachtung eines Auswerteintervalls in den vom System erkannten Grenzen, nämlich Lastaufnahme - Lastabsetzen - Lastaufnahme, usw. (Die Fig. 2a zeigt eine solchermaßen unterteilte Last-Zeit-Kurve). Sie sind aber relativ unrealistisch, wenn sie von vereinfachten Annahmen für Lastwechsel-Ereignisse ausgehen, was Lebensdauerberechnungen ungenau macht. Ferner stoßen diese Verfahren gemäß dem Stand der Technik dann an ihre Grenzen, wenn es sich nicht um eine statische Last handelt, sondern um eine sich im Verlauf des Hubes ändernde Last.Such load changes are generally based on the recognition of load absorption and load settling according to the prior art. This load change detection is done with the help of additional information such as control functions that can be expected to raise or lower a load. If recorded load curves now have to be subdivided for evaluation, this subdivision is done on the basis of such additional information (control information) or by external events, such as the bypassing of a safety device. In particular, it is assumed that a load bearing inevitably follows a load settling and vice versa. The data sets generated in this way are usually stored in a data logger with the aim of subsequently recording load cases and reconstructing them as needed. Although these methods according to the prior art permit the discrete-time consideration of an evaluation interval within the limits recognized by the system, namely load-bearing, load-bearing, load-bearing, etc. (The Fig. 2a shows such a subdivided Load-time curve). However, they are relatively unrealistic in assuming simplified assumptions for load change events, making life cycle calculations inaccurate. Furthermore, these methods according to the prior art then reach their limits when it is not a static load but a load that changes during the course of the stroke.

Aus der US 2002/144968 A1 sind ein Verfahren und ein System zur Lastmessung an einem Kranhebezeug bekannt. Bei dem Verfahren werden wenigstens die Geschwindigkeit und das Moment des Kranhebezeugs gemessen und gefiltert, und die gemessenen und gefilterten Werte miteinander und einem vorher ermittelten Belastungswert verglichen, um einen Fehlerwert zu ermitteln und auf der Grundlage dieses Fehlerwertes einen neuen gemessenen Belastungswert zu ermitteln. Aus der EP 0 737 851 A2 ist eine kontinuierliche Messung der Belastung der Hub- und Zugeinrichtungen von Hebezeugen bekannt. Dabei wird der maximale Lastbereich in eine Mehrzahl von Lastbereichen unterteilt. Dann wird jeweils die Zeit gemessen, in der die Einrichtung einem Lastbereich ausgesetzt ist, diese Zeiten werden addiert und daraus auf die Restlebensdauer der Einrichtung geschlossen.From the US 2002/144968 A1 For example, a method and system for measuring load on a crane hoist are known. In the method, at least the crane hoist speed and moment are measured and filtered, and the measured and filtered values are compared with each other and a previously determined load value to determine an error value and determine a new measured load value based on this error value. From the EP 0 737 851 A2 is a continuous measurement of the load of lifting and towing devices of hoists known. In this case, the maximum load range is divided into a plurality of load ranges. Then the time is measured in each case, in which the device is exposed to a load range, these times are added and deduced therefrom on the remaining life of the device.

Es ist deshalb die Aufgabe der vorliegenden Erfindung, ein Verfahren zur Bestimmung von Laständerungen an Hebezeugen aufzuzeigen, welches die genannten Nachteile des Standes der Technik mindestens teilweise überwindet. Insbesondere soll eine zuverlässige Rekonstruktion der Lastfälle ermöglicht werden, damit hierauf aufbauende Berechnungen optimiert werden können.It is therefore the object of the present invention to provide a method for determining load changes on hoists, which at least partially overcomes the disadvantages of the prior art. In particular, a reliable reconstruction of the load cases should be made possible so that calculations based on this can be optimized.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren zur Bestimmung von Laständerungen an Hebezeugen gelöst, wie es im Anspruch 1 beschrieben wird. Die Unteransprüche definieren bevorzugte Ausführungsformen der Erfindung.This object is achieved by a method for determining changes in load on lifting equipment, as described in claim 1. The subclaims define preferred embodiments of the invention.

Beim erfindungsgemäßen Verfahren wird in Lastverlaufsdaten eine Laständerung an einer Transitionsstelle des Lastverlaufs-Gradienten festgestellt. Ferner wird der Lastverlauf an den Transitionsstellen in zeitdiskrete Betrachtungsintervalle unterteilt. Mit anderen Worten offenbart die vorliegende Erfindung ein neues Verfahren zur Unterteilung von Lastverläufen, wobei anden Transitionsstellen ein Speicherimpuls als Laständerungsereignis im Lastverlauf erzeugt wird. Die so erzeugten Betrachtungsintervalle ermöglichen die Generierung von datenreduzierten Informationen, aus denen sich nachträglich beliebige zeitkontinuierliche Lastverläufe rekonstruieren lassen, da sie sich nicht auf der Erkennung der Aufnahme und des Absetzen einer Last beziehen.
Speziell die Verwendung des Lastverlaufs-Gradienten macht es möglich, mit einer Information, die dem Lastverlauf innewohnt, also nicht separat ermittelt werden muss, eine optimierte Unterteilung und damit Auswertung vorzunehmen.In the method according to the invention, a load change at a transition point of the load profile gradient is determined in load profile data. Furthermore, the load curve at the transition points is subdivided into discrete-time viewing intervals. In other words, the present invention discloses a novel method for subdividing load histories, wherein at the transition points a memory pulse is generated as a load change event in the course of load. The viewing intervals generated in this way enable the generation of data-reduced information, from which subsequently any continuous-time load profiles can be reconstructed, since they do not relate to the detection of the pickup and the setting down of a load.
Specifically, the use of the load gradient gradient makes it possible to carry out an optimized subdivision and thus evaluation with information that is inherent in the load history, that is, does not have to be determined separately.

Die Bestimmung gemäß dem erfindungsgemäßen Verfahren kann anhand von gespeicherten Lastverlaufsdaten erfolgen, aber auch anhand von Echtzeit-Lastverlaufsdaten. Insbesondere wird der Lastverlauf aufgezeichnet, d.h. gespeichert, und an Transitionsstellen wird ein Speicherimpuls als Laständerungsanzeige bzw. Laständerungsereignis im Lastverlauf erzeugt bzw. eingetragen.The determination according to the method according to the invention can be carried out on the basis of stored load profile data, but also on the basis of real-time load profile data. In particular, the load history is recorded, ie stored, and at transition points, a memory pulse is generated or entered as a load change indication or load change event in the course of load.

Bei einer Ausführungsform der Erfindung bleiben Betrachtungsintervalle unberücksichtigt bzw. werden unterdrückt, die offensichtlicherweise oder gemäß einem Ausscheidungskriterium unbeachtlich sind. Dabei kann das Ausscheidungskriterium insbesondere ein zeitliches Kriterium sein (z.B. zu kurzes Intervall) oder ein Kriterium, das äußere Einflüsse auf den Lastverlauf berücksichtigt (externe Ereignisse, Steuerungsinformationen).In one embodiment of the invention, viewing intervals are ignored or suppressed, which obviously or irrelevant according to an excretion criterion. In this case, the elimination criterion can be, in particular, a time criterion (for example, too short interval) or a criterion that takes into account external influences on the load profile (external events, control information).

Die Transitionsstelle kann festgestellt werden oder als Lastverlaufs-Transition in den Lastverlauf eingetragen werden, wenn der Lastverlaufs-Gradient das Vorzeichen wechselt oder auf Null wechselt. Ferner kann eine Transitionsstelle dann festgestellt oder eingetragen werden, wenn der Gradient aufeinander folgend mehr als einmal mit dem selben Vorzeichen verändert wird, wenn also der Lastverlauf zwar weiter steigt oder fällt, aber die Steilheit der Kurve sich dabei ändert.The transition point can be determined or entered as a load history transition in the load history, when the load gradient gradient changes the sign or changes to zero. Furthermore, a transition point can then be detected or entered if the gradient is changed consecutively more than once with the same sign, that is, if the load curve continues to rise or fall, but the slope of the curve changes.

Die Erfindung betrifft ferner gemäß einem etwas weiter greifenden Aspekt ein Verfahren zur Rekonstruktion von Lastfällen an Hebezeugen, bei dem zur Bestimmung der Laständerungen ein Verfahren verwendet wird, wie es oben in verschiedenen Ausführungsformen beschrieben wurde. Insbesondere können bei der Lastfall-Rekonstruktion auch weitere Laständerungen berücksichtigt werden, die aus Betriebsdaten des Hebezeugs stammen oder zu besonderen Betriebsfällen ermittelt wurden.The invention further relates, in a somewhat more extensive aspect, to a method for the reconstruction of load cases on hoists, in which a method is used to determine the load changes, as described above in various embodiments. In particular, in load case reconstruction, other load changes can be taken into account, which come from operating data of the hoist or were determined to special operating cases.

Die Erfindung wird im Weiteren anhand einer Ausführungsform und mit Hilfe der beiliegenden Grafiken näher erläutert. Sie kann alle hierin beschriebenen Merkmale einzeln sowie in jedweder sinnvollen Kombination umfassen. Die beiliegenden Grafiken zeigen in

Fig. 1
einen schematischen Systemaufbau für das erfindungsgemäße Verfahen;
Fig. 2a
einen Lastverlauf mit eingetragenen Unterteilungs-Ereignissen gemäß dem Stand der Technik; und
Fig. 2b
einen Lastverlauf mit einer Unterteilung gemäß der vorliegenden Erfindung.
The invention will be explained in more detail below with reference to an embodiment and with the aid of the enclosed graphics. It may include all features described herein individually, as well as in any meaningful combination. The enclosed graphics show in
Fig. 1
a schematic system structure for the method according to the invention;
Fig. 2a
a load history with registered subdivision events according to the prior art; and
Fig. 2b
a load curve with a subdivision according to the present invention.

Die vorliegende Erfindung kann als besondere Ausführungsform auch so charakterisiert werden, dass sie ein Verfahren zur Analyse von Laständerungen an Hebezeugen zur Auswertung und Rekonstruktion von Lastfällen offenbart, welches nicht hauptsächlich bzw. nicht ausschließlich auf der Basis der Erkennung von Liftstart und Liftende basiert. Eine Bewertungseinrichtung unterteilt den Verlauf der Last in zeitdiskrete Betrachtungsintervalle, und jede Laständerung kann zur Unterteilung eines Auswerteintervalls herangezogen werden. Die Unterteilung (Laständerungsereignis) erfolgt aufgrund von Gradientenänderungen im Lastverlauf, und speziell können hierzu auch zeitlich versetzte Laständerungen mit gleichem Gradientenvorzeichen zur Unterteilung des Auswerteintervalls herangezogen werden. Die Fig. 2b zeigt hier erfindungsgemäß eine (gegenüber der Fig. 2a) stärkere Unterteilung des Lastverlaufs, bei der die entsprechenden Gradientenänderungen berücksichtigt wurden. Aus den Informationen über die Last wird also ein Gradient gebildet, und aus den Tansitionen des Lastgradienten wird entsprechend ein Speicherimpuls generiert, nämlich bei dem jeweiligen Ereignis (Transition). Als Datengrundlage hierfür dienen gespeicherte oder in Echtzeit aufgenommene Daten, die eine direkte oder indirekte Information über die aktuelle Last am Hebezeug beinhalten.The present invention, as a particular embodiment, may also be characterized as disclosing a method for analyzing load changes on lifting gear for evaluating and reconstructing load cases which is not based mainly or not exclusively on the basis of the detection of lift start and lift end. An evaluation device divides the course of the load into time-discrete viewing intervals, and each load change can be used to subdivide an evaluation interval. The subdivision (load change event) is due to gradient changes in the load curve, and specifically, temporally offset load changes with the same gradient sign can also be used to subdivide the evaluation interval. The Fig. 2b shows here according to the invention a (compared to the Fig. 2a ) greater subdivision of the load profile, taking into account the corresponding gradient changes. From the information about the load, a gradient is thus formed, and from the sweeps of the load gradient, a memory pulse is generated correspondingly, namely at the respective event (transition). The data used for this purpose are stored or real-time recorded data, which contain direct or indirect information about the current load on the hoist.

Das erfindungsgemäße Verfahren erlaubt also die Rekonstruktion von zeitkontinuierlichen Laständerungen grundsätzlich unabhängig von der Erkennung einer Lastaufnahme oder eines Lastabsetzens und ermöglicht somit auch die Rekonstruktion von Lasten, die sich während eines Hubes verändern.Thus, the method according to the invention allows the reconstruction of time-continuous load changes basically independent of the detection of a load pick-up or a load release and thus also allows the reconstruction of loads that change during a stroke.

Natürlich können aber weitere systembekannte Informationen zusätzlich zu den erfindungsgemäß erhaltenen Informationen verarbeitet werden, um möglichst optimierte Ergebnisse zu erhalten. Beispielsweise können Ereignisse, die nachträglich gesondert betrachtet werden sollen (z.B. Betätigung einer Sicherheitseinrichtung) einen zusätzlichen Speicherimpuls generieren oder einen anderen eliminieren. In der Fig. 1 ist die Lastgradientenerkennung und die gerade oben genannte Ereignisfolge im oberen Teil dargestellt, wobei die Informationen über den Lastgradienten sowie über die Ereignisse im Betrieb einer Bewertung unterzogen und dann als Speicherimpuls im Datenspeicher abgelegt werden. Gespeichert werden hierbei Rohdaten oder aufbereitete Daten, deren Gültigkeitsbereich sich zwischen einem vorherigen Speicherimpuls und einem neuen Speicherimpuls befinden.Of course, however, further system-known information can be processed in addition to the information obtained according to the invention, in order to obtain optimally optimized results. For example, events that are to be considered separately later (eg actuation of a safety device) can generate an additional memory pulse or eliminate another one. In the Fig. 1 the load gradient detection and the sequence of events just mentioned above are shown in the upper part, whereby the information about the load gradient as well as about the events during operation is evaluated and stored as a memory pulse in the data memory. This stores raw data or processed data whose validity range is between a previous memory pulse and a new memory pulse.

Die Fig. 1 zeigt aber auch, dass Daten, die aus dem Betrieb des Hebezeugs stammen, aufbereitet und zusätzlich als Eingabedatensatz für den Datenspeicher verwendet werden können. Zusammen mit den erfindungsgemäß erhaltenen Daten (bewertete Gradientenerkennung) bedingt dieses System dann zwar ein höheres Aufkommen an zu speichernden Daten, erlaubt aber in Abhängigkeit der gespeicherten Daten eine detailliertere Rekonstruktion beliebiger Lastverläufe. Außerdem kann eine statistische Auswertung der erzeugten Betrachtungsintervalle dazu verwendet werden, die strukturelle Beanspruchung des Hebezeugs zu berechnen und bei der Rekonstruktion auszuwerten.The Fig. 1 However, it also shows that data originating from the operation of the hoist can be processed and additionally used as an input data record for the data memory. Together with the data obtained in accordance with the invention (evaluated gradient detection), this system then requires a higher amount of data to be stored, but allows a more detailed reconstruction of any load profiles as a function of the stored data. In addition, a statistical evaluation of the generated viewing intervals can be used to calculate the structural stress of the hoist and to evaluate it during the reconstruction.

Claims (8)

  1. A method for determining changes in load on lifting gear, wherein a change in load is determined within load curve data at a transition point of the load curve gradient, and wherein the load curve is sub-divided into discrete-time observation intervals at the transition points, characterised in that a memory impulse is created at transition points as a load change indicator or load change event in the load curve, wherein the observation intervals created in this manner enable data-reduced information to be generated in order to reconstruct any load curves on a continuous time basis.
  2. The method according to Claim 1, wherein changes in load are determined on the basis of stored load curve data.
  3. The method according to Claim 1, wherein changes in load are determined on the basis of real-time load curve data.
  4. The method according to any one of Claims 1 to 3, wherein observation intervals which are obviously negligible or which are negligible in accordance with an exclusion criterion are not taken into account or are suppressed, wherein the exclusion criterion is in particular a time-based criterion or a criterion which takes into account makes external influences on the load curve.
  5. The method according to any of Claims 1 to 4, wherein a transition point is determined if the load curve gradient changes sign or changes to zero.
  6. The method according to any of Claims 1 to 4, wherein a transition point is determined if the gradient changes but retains its sign and in particular if the gradient consecutively changes more than once but retains its sign.
  7. A method for reconstructing load situations on lifting gear, wherein a method in accordance with any one of Claims 1 to 6 is used to determine changes in load.
  8. The method according to Claim 7, wherein other changes in load which originate from operating data of the lifting gear or are determined in respect of particular operating situations are taken into account.
EP09159387.1A 2008-05-19 2009-05-05 Determination and reconstruction of load changes in lifting devices Active EP2123589B1 (en)

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JP (1) JP5396148B2 (en)
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CN102167259B (en) * 2010-12-28 2013-02-06 天津天安起重电器有限公司 Measuring method of loading quality of hoisting machine
FR3037681B1 (en) * 2015-06-18 2017-11-24 Manitowoc Crane Group France METHOD OF DEFINING AN OPTIMIZED LOAD CURVE FOR CRANE, METHOD AND CONTROL DEVICE FOR CONTROLLING THE SUSPENDED LOAD TO A CRANE FROM THE OPTIMIZED LOAD CURVE
DE102021108964B4 (en) 2021-04-11 2022-12-01 Core Sensing Gmbh Method for detecting a load spectrum and load spectrum detection device and machine element with a load spectrum detection device

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EP1818308A1 (en) 2006-02-09 2007-08-15 Franke Henning Crane control

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KR101108325B1 (en) 2012-01-25
CN101585485A (en) 2009-11-25
US8200401B2 (en) 2012-06-12
CA2666015A1 (en) 2009-11-19
DE102008024215A1 (en) 2009-12-03
ES2451506T3 (en) 2014-03-27
JP5396148B2 (en) 2014-01-22
JP2010006607A (en) 2010-01-14
KR20090120428A (en) 2009-11-24
DE102008024215B4 (en) 2015-08-20
EP2123589A1 (en) 2009-11-25
CN101585485B (en) 2013-05-29
US20090287381A1 (en) 2009-11-19
CA2666015C (en) 2011-07-26

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