EP2855333B1 - Electrohydraulic device for crane boom operation - Google Patents

Electrohydraulic device for crane boom operation 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
German (de)
French (fr)
Other versions
EP2855333A1 (en
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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Publication date
Application filed by Wolffkran Holding AG filed Critical Wolffkran Holding AG
Publication of EP2855333A1 publication Critical patent/EP2855333A1/en
Application granted granted Critical
Publication of EP2855333B1 publication Critical patent/EP2855333B1/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
    • B66C23/06—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.

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.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.

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.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. In this case, a hydraulic unit, comprising an oil pump, the amount of oil required for power transmission with the required pressure available.

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.When the boom has reached the desired angle, i. a further retraction or extension is initially no longer required, a changing amount of oil or an alternating oil pressure on the hydraulic cylinder is no longer needed. The hydraulic unit only delivers as much oil after stopping the movement as is necessary to maintain the pressure. In this operating state, the electric motor, which drives the hydraulic unit, is almost idling.

Bei einem Turmkran mit hydraulisch verstellbarem Wippausleger ist der Motor, der das Hydraulikaggregat antreibt, üblicherweise ein Drehstromasynchronmotor.In a tower crane with hydraulically adjustable luffing jib, the motor that drives the hydraulic unit is usually a three-phase asynchronous motor.

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.An idling three-phase asynchronous motor, however, has a very poor power factor and efficiency. During the idling phase, 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.

Zudem sind die von dem Hydraulikaggregat verursachten Geräusche im Leerlauf nur vernachlässigbar geringer ausgeprägt als im normalen Betriebszustand.In addition, the noise caused by the hydraulic unit in idle only negligible pronounced as in normal operating condition.

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.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.

Diese Aufgabe wird gelöst durch eine elektrohydraulische Vorrichtung zur Verstellung eines Auslegers gemäß Anspruch 1.This object is achieved by an electro-hydraulic device for adjusting a boom according to claim 1.

Die Aufgabe wird weiterhin gelöst durch einen Wippausleger-Turmkran gemäß Anspruch 4.The object is further achieved by a luffing jib tower crane according to claim 4.

Weitere Ausführungsformen sind Gegenstand der Unteransprüche oder nachfolgend beschrieben.Further embodiments are the subject matter of the subclaims or described below.

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.The inventive electro-hydraulic device for adjusting a boom causes a time-delayed shutdown of the engine, if for a predetermined period (= delay time) no changing oil pressure on the hydraulic cylinder is needed. On the other hand, if only a very brief interruption of the course of motion takes place, e.g. When positioning a load, usually no shutdown of the engine.

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.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.

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.It is particularly advantageous if 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. In particular, the engine can also start with an electronic soft starter.

Bevorzugt ist die Verzögerungszeit bei einer erfindungsgemäßen elektrohydraulischen Auslegerverstellung nach Belieben einstellbar.Preferably, the delay time in an electro-hydraulic boom adjustment according to the invention is adjustable as desired.

Soll die Stellung des Auslegers wieder verändert werden, schaltet sich der Motor bei Betätigung der Bedienelemente für den Ausleger wieder an.If the position of the boom to be changed again, the motor turns on when operating the controls for the boom again.

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.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.

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.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.

Claims (4)

  1. An electro-hydraulic device for moving a jib for a tower crane, wherein the electro-hydraulic device comprises a hydraulic assembly with a motor, characterized in that a switching off of the motor of the hydraulic assembly is carried out if the position of the jib is unchanged for a predetermined period of time.
  2. The electro-hydraulic device for moving a jib according to Claim 1, characterized in that a renewed switching on of the motor is carried out if the operating element(s) for changing the vertical position of the boom, the lifting gear, or the slewing gear is/are actuated.
  3. The electro-hydraulic device for moving a jib according to Claim 1 or 2, characterized in that the motor is a three-phase asynchronous motor.
  4. A derricking-jib tower crane comprising an electro-hydraulic device for moving a jib according to one of the preceding claims.
EP13725595.6A 2012-05-31 2013-05-16 Electrohydraulic device for crane boom operation Active EP2855333B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012010759A DE102012010759A1 (en) 2012-05-31 2012-05-31 Electrohydraulic device for adjusting a boom
PCT/EP2013/060181 WO2013178480A1 (en) 2012-05-31 2013-05-16 Electro-hydraulic device for moving a jib

Publications (2)

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

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ID=48536806

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Application Number Title Priority Date Filing Date
EP13725595.6A Active EP2855333B1 (en) 2012-05-31 2013-05-16 Electrohydraulic device for crane boom operation

Country Status (7)

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

Families Citing this family (1)

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

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1835976U (en) * 1958-01-16 1961-08-03 Kocks Gmbh Friedrich CONTINUOUSLY ADJUSTABLE Jib RETRACTING GEAR FOR LIFTING CRANES, IN PARTICULAR DOUBLE JIB LIFTING LIFTING CRANES.
DE19908485A1 (en) 1999-02-26 2000-08-31 Man Wolffkran Luffing crane
US20070245165A1 (en) * 2000-09-27 2007-10-18 Amphus, Inc. System and method for activity or event based dynamic energy conserving server reconfiguration
JP5085202B2 (en) * 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 Hybrid power supply
US8141681B2 (en) * 2008-04-07 2012-03-27 Safeworks, Llc Tower climbing assist device
FR2931466B1 (en) 2008-05-22 2011-01-07 Manitowoc Crane Group France METHOD FOR CONTROLLING THE ORIENTATION MOVEMENT OF THE ROTATING PART OF A TOWER CRANE
JP5731753B2 (en) * 2009-02-17 2015-06-10 ローム株式会社 Motor drive circuit, drive method, and cooling device
DE102010007545A1 (en) * 2010-02-11 2011-08-11 Gottwald Port Technology GmbH, 40597 Crane, especially mobile harbor crane, with a hybrid propulsion system
DE102010008155B4 (en) 2010-02-16 2013-02-28 Wolffkran Holding Ag Luffing jib tower crane
DE102010022601A1 (en) * 2010-04-15 2011-10-20 Terex-Demag Gmbh Crane with additional unit

Also Published As

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

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