EP2855333B1 - Elektrohydraulische vorrichtung zur verstellung eines auslegers - Google Patents

Elektrohydraulische vorrichtung zur verstellung eines auslegers Download PDF

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Publication number
EP2855333B1
EP2855333B1 EP13725595.6A EP13725595A EP2855333B1 EP 2855333 B1 EP2855333 B1 EP 2855333B1 EP 13725595 A EP13725595 A EP 13725595A EP 2855333 B1 EP2855333 B1 EP 2855333B1
Authority
EP
European Patent Office
Prior art keywords
electro
motor
jib
hydraulic device
hydraulic
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
EP13725595.6A
Other languages
English (en)
French (fr)
Other versions
EP2855333A1 (de
Inventor
Ulrich DÖRZBACH
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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Filing date
Publication date
Application filed by Wolffkran Holding AG filed Critical Wolffkran Holding AG
Publication of EP2855333A1 publication Critical patent/EP2855333A1/de
Application granted granted 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
    • B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
    • 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
    • B66C13/22—Control systems or devices for electric drives
    • B66C13/30—Circuits for braking, traversing, or slewing motors
    • 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
    • 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
    • B66C23/84—Slewing gear
    • B66C23/86—Slewing gear hydraulically actuated

Definitions

  • the invention relates to an electro-hydraulic device for adjusting a boom and a tower crane with luffing jib with such a device.
  • the EP 1 031 531 A2 discloses such a crane.
  • the adjustment of the boom in the vertical direction can be done on tower cranes with luffing jib via a hydraulic cylinder, which is retracted or extended to achieve the desired distance crane axle / cable axis.
  • a hydraulic unit comprising an oil pump, the amount of oil required for power transmission with the required pressure available.
  • the motor that drives the hydraulic unit is usually a three-phase asynchronous motor.
  • An idling three-phase asynchronous motor has a very poor power factor and efficiency.
  • the three-phase asynchronous motor continues to consume energy. Much of this energy consumption, estimated at around 60%, is unnecessary; the energy is only used to empty the oil in the circulation, but not for the work of the hydraulic cylinder. For cost and environmental reasons, a reduction in energy consumption is desirable.
  • the object was therefore to provide an electro-hydraulic device for adjusting a boom for a tower crane, in which the energy consumption for the boom adjustment and the noise are reduced.
  • the object is further achieved by a luffing jib tower crane according to claim 4.
  • the restart of the engine and its run-up always also require a certain amount of time, so that a balance has to take place, if the interruption is long enough to give preference to the energy saving over the disturbing for the crane operator delaying the movement. Accordingly, the setting of the delay time.
  • the time taken for the renewed switching on and running up of the motor is kept low by means of an optimized electrical or electronic starting circuit. Then the delay time can be chosen to be lower; and thus the energy savings are improved.
  • the engine can also start with an electronic soft starter.
  • the delay time in an electro-hydraulic boom adjustment according to the invention is adjustable as desired.
  • the motor turns on when operating the controls for the boom again.
  • the working time of a crane per year can be estimated at 260 days times 10 hours equal to 2600 hours.
  • the break times of a luffing gear should be on average about 60 percent, ie 1560 hours. Assuming, for example, that at a rated power of 22 kW, the no-load losses amount to 1.1 kW, the energy saving in this example is 1,700 kWh per year.
  • the system may be such that a restart of the engine is effected not only by an initiated change in the boom angle, but also by any other crane movements, such as the hoist or the slewing gear.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Jib Cranes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Control And Safety Of Cranes (AREA)

Description

  • Die Erfindung betrifft eine elektrohydraulische Vorrichtung zur Verstellung eines Auslegers und einen Turmkran mit Wippausleger mit einer solchen Vorrichtung. Die EP 1 031 531 A2 offenbart einen solchen Kran.
  • Die Verstellung des Auslegers in vertikaler Richtung kann bei Turmkranen mit Wippausleger über einen Hydraulikzylinder erfolgen, der zur Erzielung des gewünschten Abstands Kranachse/Seilachse ein- bzw. ausgefahren wird. Dabei stellt ein Hydraulikaggregat, umfassend eine Ölpumpe, die zur Kraftübertragung erforderliche Ölmenge mit dem erforderlichen Druck zur Verfügung.
  • Wenn der Ausleger den gewünschten Winkel erreicht hat, d.h. ein weiteres Ein- bzw. Ausfahren zunächst nicht mehr erforderlich ist, wird eine wechselnde Ölmenge bzw. ein wechselnder Öldruck am Hydraulikzylinder nicht weiter benötigt. Das Hydraulikaggregat fördert nach dem Anhalten der Bewegung nur noch soviel Öl, wie erforderlich ist, um den Druck aufrechtzuerhalten. In diesem Betriebszustand läuft der Elektromotor, welcher das Hydraulikaggregat antreibt, nahezu im Leerlauf.
  • Bei einem Turmkran mit hydraulisch verstellbarem Wippausleger ist der Motor, der das Hydraulikaggregat antreibt, üblicherweise ein Drehstromasynchronmotor.
  • Ein im Leerlauf laufender Drehstromasynchronmotor hat allerdings einen sehr schlechten Leistungsfaktor und Wirkungsgrad. Während der Leerlaufphase verbraucht der Drehstromasynchronmotor weiter Energie. Ein Großteil dieses Energieverbrauchs, schätzungsweise um die 60%, ist unnötig; die Energie wird lediglich verwendet, um das Öl leer im Kreislauf zu befördern, nicht jedoch für die Arbeit des Hydraulikzylinders. Aus Kosten- und Umweltgründen ist eine Senkung des Energieverbrauches erstrebenswert.
  • Zudem sind die von dem Hydraulikaggregat verursachten Geräusche im Leerlauf nur vernachlässigbar geringer ausgeprägt als im normalen Betriebszustand.
  • Aufgabe war es daher, eine elektrohydraulische Vorrichtung zur Verstellung eines Auslegers für einen Turmkran bereitzustellen, bei welcher der Energieverbrauch für die Auslegerverstellung und die Geräuschentwicklung reduziert sind.
  • Diese Aufgabe wird gelöst durch eine elektrohydraulische Vorrichtung zur Verstellung eines Auslegers gemäß Anspruch 1.
  • Die Aufgabe wird weiterhin gelöst durch einen Wippausleger-Turmkran gemäß Anspruch 4.
  • Weitere Ausführungsformen sind Gegenstand der Unteransprüche oder nachfolgend beschrieben.
  • Die erfindungsgemäße elektrohydraulische Vorrichtung zur Verstellung eines Auslegers bewirkt ein zeitverzögertes Abschalten des Motors, wenn für einen vorbestimmten Zeitraum (= Verzögerungszeit) kein wechselnder Öldruck am Hydraulikzylinder benötigt wird. Findet dagegen nur eine sehr kurze Unterbrechung des Bewegungsablaufes statt, z.B. beim Positionieren einer Last, erfolgt üblicherweise keine Abschaltung des Motors.
  • Das erneute Einschalten des Motors sowie sein Hochlaufen erfordern stets ebenfalls eine gewisse Zeit, so dass eine Abwägung stattzufinden hat, ob die Unterbrechung lange genug ist, um der Energieeinsparung gegenüber der für den Kranführer störenden Verzögerung der Bewegung den Vorzug zu geben. Entsprechend erfolgt die Einstellung der Verzögerungszeit.
  • Besonders vorteilhaft ist es, wenn die Zeit, die das erneute Einschalten und das Hochlaufen des Motors dauert, durch eine optimierte elektrische oder elektronische Anlaufschaltung gering gehalten wird. Dann kann die Verzögerungszeit umso geringer gewählt werden; und damit die Energieeinsparung verbessert werden. Insbesondere kann der Motor auch mit einem elektronischen Sanftanlaufgerät starten.
  • Bevorzugt ist die Verzögerungszeit bei einer erfindungsgemäßen elektrohydraulischen Auslegerverstellung nach Belieben einstellbar.
  • Soll die Stellung des Auslegers wieder verändert werden, schaltet sich der Motor bei Betätigung der Bedienelemente für den Ausleger wieder an.
  • Die Arbeitszeit eines Kranes pro Jahr kann auf 260 Tage mal 10 Stunden gleich 2600 Stunden geschätzt werden. Die Pausenzeiten eines Wippwerks dürften im Durchschnitt ca. 60 Prozent, also 1560 Stunden betragen. Geht man beispielsweise davon aus, dass bei einer Nennleistung von 22 kW die Leerlaufverluste 1,1 kW betragen, so beträgt die Energieeinsparung in diesem Beispiel 1.700 kWh pro Jahr.
  • Das System kann so beschaffen sein, dass ein Neustart des Motors nicht nur durch eine eingeleitete Änderung des Auslegerwinkels, sondern auch durch beliebige andere Kranbewegungen, etwa des Hubwerks oder des Drehwerks, bewirkt wird.

Claims (4)

  1. Elektrohydraulische Vorrichtung zur Verstellung eines Auslegers für einen Turmkran, wobei die Elektrohydraulische Vorrichtung einen Hydraulikaggregat mit einem Motor umfasst, dadurch gekennzeichnet, dass ein Abschalten des Motors des Hydraulikaggregats erfolgt, wenn die Stellung des Auslegers für einen vorbestimmten Zeitraum nicht verändert wird.
  2. Elektrohydraulische Vorrichtung zur Verstellung eines Auslegers nach Anspruch 1, dadurch gekennzeichnet, dass ein erneutes Anschalten des Motors erfolgt, wenn die Bedienelemente zur Veränderung der vertikalen Stellung des Auslegers, das Hubwerk oder das Drehwerk betätigt werden/wird.
  3. Elektrohydraulische Vorrichtung zur Verstellung eines Auslegers nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Motor ein Drehstromasynchronmotor ist.
  4. Wippausleger-Turmkran, umfassend eine elektrohydraulische Vorrichtung zur Verstellung eines Auslegers nach einem der vorhergehenden Ansprüche.
EP13725595.6A 2012-05-31 2013-05-16 Elektrohydraulische vorrichtung zur verstellung eines auslegers Active EP2855333B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012010759A DE102012010759A1 (de) 2012-05-31 2012-05-31 Elektrohydraulische Vorrichtung zur Verstellung eines Auslegers
PCT/EP2013/060181 WO2013178480A1 (de) 2012-05-31 2013-05-16 Elektrohydraulische vorrichtung zur verstellung eines auslegers

Publications (2)

Publication Number Publication Date
EP2855333A1 EP2855333A1 (de) 2015-04-08
EP2855333B1 true EP2855333B1 (de) 2016-06-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13725595.6A Active EP2855333B1 (de) 2012-05-31 2013-05-16 Elektrohydraulische vorrichtung zur verstellung eines auslegers

Country Status (7)

Country Link
US (1) US9873596B2 (de)
EP (1) EP2855333B1 (de)
DE (1) DE102012010759A1 (de)
ES (1) ES2587792T3 (de)
HK (1) HK1204599A1 (de)
SG (1) SG11201407911YA (de)
WO (1) WO2013178480A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019122956A1 (de) * 2019-08-27 2021-03-18 J.D. Neuhaus Holding Gmbh & Co. Kg Fluidbetriebenes Hebezeug

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1835976U (de) * 1958-01-16 1961-08-03 Kocks Gmbh Friedrich Stufenlos regelbares, ausleger-einziehwerk fuer wippkrane, insbesondere doppellenker-wippdrehkrane.
DE19908485A1 (de) 1999-02-26 2000-08-31 Man Wolffkran Wippkran
US20070245165A1 (en) * 2000-09-27 2007-10-18 Amphus, Inc. System and method for activity or event based dynamic energy conserving server reconfiguration
JP5085202B2 (ja) * 2007-06-26 2012-11-28 住友重機械エンジニアリングサービス株式会社 ハイブリット電源装置
US8141681B2 (en) * 2008-04-07 2012-03-27 Safeworks, Llc Tower climbing assist device
FR2931466B1 (fr) 2008-05-22 2011-01-07 Manitowoc Crane Group France Procede de commande du mouvement d'orientation de la partie tournante d'une grue a tour
JP5731753B2 (ja) * 2009-02-17 2015-06-10 ローム株式会社 モータの駆動回路および駆動方法ならびに冷却装置
DE102010007545A1 (de) * 2010-02-11 2011-08-11 Gottwald Port Technology GmbH, 40597 Kran, insbesondere Hafenmobilkran, mit einem Hybridantriebssystem
DE102010008155B4 (de) 2010-02-16 2013-02-28 Wolffkran Holding Ag Wippausleger-Turmkran
DE102010022601A1 (de) * 2010-04-15 2011-10-20 Terex-Demag Gmbh Kran mit Zusatzaggregat

Also Published As

Publication number Publication date
HK1204599A1 (en) 2015-11-27
US20150203335A1 (en) 2015-07-23
WO2013178480A1 (de) 2013-12-05
SG11201407911YA (en) 2015-01-29
DE102012010759A1 (de) 2013-12-05
US9873596B2 (en) 2018-01-23
EP2855333A1 (de) 2015-04-08
ES2587792T3 (es) 2016-10-26

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