EP2123593B1 - Electro-hydraulic leak compensation - Google Patents

Electro-hydraulic leak compensation Download PDF

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Publication number
EP2123593B1
EP2123593B1 EP20090158346 EP09158346A EP2123593B1 EP 2123593 B1 EP2123593 B1 EP 2123593B1 EP 20090158346 EP20090158346 EP 20090158346 EP 09158346 A EP09158346 A EP 09158346A EP 2123593 B1 EP2123593 B1 EP 2123593B1
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EP
European Patent Office
Prior art keywords
pressure
lowering
load
lifting
hydraulic motor
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EP20090158346
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German (de)
French (fr)
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EP2123593A1 (en
Inventor
Thomas Heidrich
Johannes Schürmann
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Manitowoc Crane Group France SAS
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Manitowoc Crane Group France SAS
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Publication of EP2123593A1 publication Critical patent/EP2123593A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/26—Operating devices pneumatic or hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • B66C13/23—Circuits for controlling the lowering of the load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/42—Control devices non-automatic
    • B66D1/44—Control devices non-automatic pneumatic of hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0324—With control of flow by a condition or characteristic of a fluid
    • Y10T137/0379—By fluid pressure

Definitions

  • the invention relates to an electro-hydraulic leak compensation device for a mobile crane lowering brake system in an open hydraulic circuit and also to a method for electro-hydraulic leak compensation in a mobile crane lowering brake system in an open hydraulic circuit.
  • Both the method and the apparatus can be used in a mobile crane with one or more winches in the open hydraulic circuit, in which the attached load is secured via a lowering brake valve and a mechanical brake against load crash.
  • the pressure in the lifting line is measured by the pressure sensor preferably before closing the mechanical brake before closing the mechanical brake.
  • This measured pressure can also be referred to as actual pressure, as it reflects the current load condition on the crane's hoist.
  • fluid is removed from the lifting line for pressure buildup and pumped into the volume between the lowering brake valve and the hydraulic motor.

Description

Die Erfindung betrifft eine elektrohydraulische Leck-Kompensationsvorrichtung für ein Mobilkran-Senkbremssystem in einem offenen hydraulischen Kreis und ferner ein Verfahren zur elektrohydraulischen Leck-Kompensation bei einem Mobilkran-Senkbremssystem in einem offenen hydraulischen Kreis. Sowohl das Verfahren als auch die Vorrichtung kann in einem Mobilkran mit einer oder mit mehreren Hubwinden im offenen hydraulischen Kreis eingesetzt werden, bei dem die angehängte Last über ein Senkbremsventil und eine mechanische Bremse gegen Lastabsturz gesichert ist.The invention relates to an electro-hydraulic leak compensation device for a mobile crane lowering brake system in an open hydraulic circuit and also to a method for electro-hydraulic leak compensation in a mobile crane lowering brake system in an open hydraulic circuit. Both the method and the apparatus can be used in a mobile crane with one or more winches in the open hydraulic circuit, in which the attached load is secured via a lowering brake valve and a mechanical brake against load crash.

Im Stand der Technik sind Mobilkrane mit einem oder mehreren Hubwerken bekannt, die im hydraulisch offenen Kreis betrieben werden. Dabei wird die gehobene Last durch ein Senkbremsventil am Hydraulikmotor in Kombination mit einer mechanischen Bremse gehalten.In the prior art mobile cranes are known with one or more hoists, which are operated in the hydraulic open circuit. The lifted load is held by a lowering brake valve on the hydraulic motor in combination with a mechanical brake.

Moderne Mobilkrane werden zum Heben von immer größeren Lasten eingesetzt, wobei gleichzeitig der Anspruch für feinfühliges Ansteuern der Hubwinden beim Kunden steigt. Das millimetergenaue Heben und Senken der Last wird durch systembedingte innere Leckagen im Hydraulikmotor negativ beeinflusst.Modern mobile cranes are used for lifting ever larger loads, while at the same time the demand for sensitive control of the hoisting winches at the customer increases. The millimeter-accurate lifting and lowering of the load is adversely affected by system-related internal leaks in the hydraulic motor.

Zwischen dem Senkbremsventil und dem Hubwerksmotor befindet sich nämlich ein Ölvolumen, welches bei geöffneter mechanischer Bremse unter Druck steht und die an der Hubwinde hängende Last hält. Nach dem Schließen der mechanischen Bremse baut sich dieser Lastdruck durch die innere Leckage des Hydraulikmotors ab. Wird die mechanische Bremse wieder geöffnet, fehlt demzufolge eine bestimmte in der Zwischenzeit entwichene Ölmenge. Der Lastdruck baut sich dann erst wieder durch minimales Zurückdrehen der Winde und des Hydraulikmotors wieder auf. Das führt zu einem Anfahrruck der Hubwinde beim Heben und Senken der Last. Insbesondere bei Winden mit großen Hydraulikmotoren wird der Ruck als störend empfunden.Namely, there is an oil volume between the lowering brake valve and the hoist motor which is under pressure when the mechanical brake is open and keeps the load hanging on the hoist winch. After closing the mechanical brake, this load pressure breaks down due to the internal leakage of the hydraulic motor. Consequently, when the mechanical brake is re-opened, a certain quantity of oil that has escaped in the meantime is missing. The load pressure builds up again only by minimally turning back the winch and the hydraulic motor. This leads to a starting pressure of the hoist winch when lifting and lowering the load. Especially with winches with large hydraulic motors, the jolt is distracting.

Ferner unterliegt grundsätzlich jeder Hydraulikmotor alterungsbedingten Verschleißerscheinungen, die sich im Laufe seiner Lebensdauer durch Zunahme der inneren Leckagen zeigen. Dies bewirkt eine weitere negative Beeinflussung des Anlaufverhaltens.In addition, basically every hydraulic motor is subject to age-related wear and tear, which manifests itself in the course of its life due to an increase in the internal leakages. This causes a further negative influence on the startup behavior.

Aus der DE 196 04 428 C2 ist eine Steuervorrichtung für ein Hubwerk eines Krans bekannt, welches ein ruckfreies Halten, Heben oder Absenken einer Last durch Vergleich des Öldrucks im Hydraulikkreis mit dem Moment der Hubwerkstrommel ermöglicht. Dabei ist zwischen einer Hydraulikpumpe und einem Hydraulikmotor in einem geschlossenen Hydraulikkreis ein Drucksensor, und ein Momentensensor an der Hubwerkstrommel angeordnet. Während des Kranbetriebs wird die Feststellbremse erst wieder gelöst, nachdem der Drucksensor einen Druck misst, welcher dem Haltemoment der Hubwerkstrommel gemäß dem aktuellen Lastzustand entspricht.From the DE 196 04 428 C2 a control device for a hoist of a crane is known, which allows a jerk-free holding, lifting or lowering a load by comparing the oil pressure in the hydraulic circuit with the moment of the hoist drum. In this case, between a hydraulic pump and a hydraulic motor in a closed hydraulic circuit, a pressure sensor, and a torque sensor arranged on the hoist drum. During crane operation, the parking brake is released only after the pressure sensor measures a pressure which corresponds to the holding torque of the hoist drum according to the current load condition.

Um beim Senken einer Last die Absenkgeschwindigkeit einstellen zu können, schlägt die JP 8217389 A vor, den Fluiddruck mittels eines Druck/Temperatursensors auf der Lastseite eines Hydraulikmotors zu messen, um daraus Werte für die letztendlich gewünschte Absenkgeschwindigkeit zu erhalten. Eine Pumpe entnimmt dabei einem Tank Fluid und pumpt dieses in das Volumen zwischen Absenkventil und Motor, so dass letztendlich eine gewünschte Absenkgeschwindigkeit erreicht wird.To be able to set the lowering speed when lowering a load, the JP 8217389 A to measure the fluid pressure by means of a pressure / temperature sensor on the load side of a hydraulic motor to obtain therefrom values for the ultimate desired lowering speed. A pump removes fluid from a tank and pumps it into the volume between the lowering valve and the engine, so that ultimately a desired lowering speed is achieved.

Es ist die Aufgabe der vorliegenden Erfindung, eine Leck-Kompensationsvorrichtung für ein Mobilkran-Senkbremssystem in einem offenen hydraulischen Kreis mit einer oder mit mehreren Hubwinden bereitzustellen und somit einen Mobilkran zu schaffen, der gegenüber bekannten Systemen ein besseres Anlaufverhalten der Hubwinden aufweist.It is the object of the present invention to provide a leak compensation device for a mobile crane lowering brake system in an open hydraulic circuit with one or more hoisting winches, and thus to provide a mobile crane which has a better start-up behavior of hoisting winches over known systems.

Diese Aufgabe wird durch eine elektrohydraulische Leck-Kompensationsvorrichtung gemäß dem Anspruch 1 bzw. durch ein Verfahren zur elektrohydraulischen Leck-Kompensation gemäß dem Anspruch 8 gelöst. Die Unteransprüche definieren dabei bevorzugte Ausführungsformen der vorliegenden Erfindung.This object is achieved by an electro-hydraulic leak compensation device according to claim 1 or by a method for electro-hydraulic leak compensation according to claim 8. The dependent claims define preferred embodiments of the present invention.

Erfindungsgemäß umfasst die elektrohydraulische Leck-Kompensationsvorrichtung einen Drucksensor, der den hydraulischen Druck auf der Lastseite des Hydraulikmotors vor dem Schließen der mechanischen Bremse misst. Somit ist der hydraulische Druck bzw. der Lastdruck unmittelbar vor dem Schließen der mechanischen Bremse bekannt und es kann demzufolge vor dem Öffnen der mechanischen Bremse dieser gemessene Druckwert wieder aufgebaut werden, um ein ruckfreies Anfahren der Hubwinde zu ermöglichen. Dabei ist die Lastseite des Hydraulikmotors die Seite im Hydraulikkreis, an der sich die Hebeleitung für den Hydraulikmotor befindet.According to the invention, the electro-hydraulic leak compensation device comprises a pressure sensor which measures the hydraulic pressure on the load side of the hydraulic motor before closing the mechanical brake. Thus, the hydraulic pressure or the load pressure known immediately before the closing of the mechanical brake and it can therefore be rebuilt before opening the mechanical brake this measured pressure value to allow a smooth start-up of the hoist winch. The load side of the hydraulic motor is the side in the hydraulic circuit at which the lifting line for the hydraulic motor is located.

Eine Pumpe des Mobilkrans entnimmt vor dem Öffnen der mechanischen Bremse Fluid aus der Hebeleitung und verbringt sie in das Volumen zwischen Hydraulikmotor und Senkbremsventil, bis die gewünschte Fluidmenge verbracht, bzw. das gewünschte Druckniveau im Volumen erreicht wurde.A pump of the mobile crane takes before opening the mechanical brake fluid from the lifting line and spends it in the volume between the hydraulic motor and Senkbremsventil until the desired amount of fluid spent, or the desired pressure level in the volume was reached.

Dabei kann der erreichte aufgebaute Druck den gleichen Wert aufweisen wie der vor dem Schließen der mechanischen Bremse herrschende Druck, jedoch kann er sich auch davon unterscheiden, also höher oder niedriger ausfallen als der gemessene Druck vor dem Schließen der mechanischen Bremse.In this case, the pressure built up can have the same value as the prevailing pressure before closing the mechanical brake, but it can also be different, ie higher or lower than the measured pressure before closing the mechanical brake.

In einer bevorzugten Ausführungsform speichert eine Steuereinheit den gemessenen Druck als Ist-Druck. Dieser dem Lastfall entsprechende gemessene Ist-Druck dient dann als Referenz für den Druck, der kurz vor dem Öffnen der mechanischen Bremse aufgebaut werden muss, um ein ruckfreies Anfahren des Hubwerks zu ermöglichen. Dazu wird in ein Volumen zwischen dem Hydraulikmotor und dem Senkbremsventil Hydraulikfluid eingebracht, um die während der Schließdauer der mechanischen Bremse durch Leckage entwichene Fluidmenge im Volumen auszugleichen.In a preferred embodiment, a control unit stores the measured pressure as the actual pressure. This measured actual pressure, which corresponds to the load case, then serves as a reference for the pressure which has to be built up shortly before the mechanical brake is opened, in order to enable jerk-free starting of the lifting mechanism. For this purpose, hydraulic fluid is introduced into a volume between the hydraulic motor and the lowering brake valve in order to compensate for the volume of fluid escaped by leakage during the closing time of the mechanical brake.

Weiterhin kann das Hubwerk ein Getriebe umfassen, so dass der Hydraulikmotor letztendlich über das Getriebe und die mechanische Bremse an die Hubwerkstrommel gekoppelt ist.Furthermore, the hoist may comprise a gear, so that the hydraulic motor is finally coupled via the gear and the mechanical brake to the hoist drum.

In einer weiter bevorzugten Ausführungsform befindet sich das Senkbremsventil im Hydraulikkreis auf der Lastseite des Hydraulikmotors, also an der Seite, an der die Hebeleitung zum Hydraulikmotor führt, welcher durch den darin befindlichen Druck angetrieben wird.In a further preferred embodiment, the lowering brake valve is located in the hydraulic circuit on the load side of the hydraulic motor, ie on the side at which the Lever line leads to the hydraulic motor, which is driven by the pressure therein.

So ist es auch vorstellbar, dass der Drucksensor im Hydraulikkreis auf der Lastseite des Senkbremsventils, also an der Seite der zum Senkbremsventil führenden Hebeleitung angeordnet ist. Mit anderen Worten ist das Senkbremsventil in dieser Ausführungsform zwischen Drucksensor und Hydraulikmotor im Hydraulikkreis angeordnet, jedoch ist es auch vorstellbar, dass sich der Drucksensor zwischen Senkbremsventil und Hydraulikmotor befindet.Thus, it is also conceivable that the pressure sensor in the hydraulic circuit on the load side of the lowering brake valve, that is arranged on the side of the leading to the lowering brake valve lever line. In other words, the lowering brake valve is arranged in this embodiment between the pressure sensor and the hydraulic motor in the hydraulic circuit, but it is also conceivable that the pressure sensor is located between the lowering brake valve and the hydraulic motor.

Die Erfindung betrifft des Weiteren ein Verfahren zur elektrohydraulischen Leck-Kompensation bei einem Mobilkran-Senkbremssystem in einem offenen hydraulischen Kreis.The invention further relates to a method for electrohydraulic leak compensation in a mobile crane lowering brake system in an open hydraulic circuit.

Erfindungsgemäß wird vor dem Schließen der mechanischen Bremse bevorzugterweise unmittelbar vor dem Schließen der mechanischen Bremse der Druck in der Hebeleitung, also auf der Lastseite des Hydraulikmotors durch den Drucksensor gemessen. Dieser gemessene Druck kann auch als Ist-Druck bezeichnet werden, da er den aktuellen Lastzustand am Hubwerk des Krans wiedergibt. Vor dem Öffnen der mechanischen Bremse wird zum Druckaufbau Fluid aus der Hebeleitung entnommen und in das Volumen zwischen Senkbremsventil und Hydraulikmotor gepumpt.According to the invention, the pressure in the lifting line, that is, on the load side of the hydraulic motor is measured by the pressure sensor preferably before closing the mechanical brake before closing the mechanical brake. This measured pressure can also be referred to as actual pressure, as it reflects the current load condition on the crane's hoist. Before opening the mechanical brake, fluid is removed from the lifting line for pressure buildup and pumped into the volume between the lowering brake valve and the hydraulic motor.

Anschließend wird bevorzugt durch eine Steuereinheit ein Soll-Druck festgelegt, der durch Verrechnung des gemessenen Ist-Drucks mit einem vorher festgelegten Wert in Abhängigkeit des Lastzustandes errechnet wird. Dieser errechnete Soll-Druck wird dann unmittelbar vor dem Öffnen der mechanischen Bremse im Volumen zwischen Senkbremsventil und Hydraulikmotor aufgebaut, um ein ruckfreies Anfahren des Hubwerks zu ermöglichen. Mit anderen Worten wird also mit Hilfe eines Drucksensors der Lastdruck der Winde erfasst und ggf. von der Steuerung mit einem Faktor belegt, so dass vor jedem Öffnen der mechanischen Bremse durch Zugabe von Hydrauliköl in den Raum zwischen Senkbremsventil und Hydraulikmotor dieser wiederhergestellt wird. Dies geschieht durch Ansteuern der Winde in Hebenrichtung bei geschlossener mechanischer Bremse.Subsequently, a target pressure is preferably determined by a control unit, which is calculated by offsetting the measured actual pressure with a predetermined value as a function of the load condition. This calculated target pressure is then built up immediately before the opening of the mechanical brake in the volume between the lowering brake valve and hydraulic motor to allow a smooth start of the hoist. In other words, therefore, the load pressure of the winch is detected with the aid of a pressure sensor and, if necessary, occupied by the controller with a factor such that it is restored before the mechanical brake is opened by adding hydraulic oil into the space between the lowering brake valve and the hydraulic motor. This is done by controlling the winch in lifting direction with closed mechanical brake.

Weiter bevorzugt können dabei alle Verfahrensschritte des erfindungsgemäßen Verfahrens vor jedem Senken und Heben einer Last vollautomatisch ablaufen, also ohne dass ein Bediener während des Verfahrensablaufs eingreifen muss.More preferably, all process steps of the method according to the invention run fully automatically before each lowering and lifting of a load, ie without an operator having to intervene during the procedure.

Ferner ist es möglich, dass vor dem Schließen, insbesondere unmittelbar vor dem Schließen der mechanischen Bremse der herrschende Betriebszustand erfasst wird, also auch zwischen dem Heben und Senken einer Last unterschieden wird. Diese Unterscheidung erlaubt es letztendlich der Steuerung einen in Abhängigkeit des Lastzustandes festgelegten Wert mit dem gemessenen Ist-Druck zu verrechnen. Es ist leicht vorstellbar, dass kurz nach dem Anheben einer Last vor dem Hydraulikmotor ein höherer Druck als beim Halten der gleichen Last vorherrscht, da zum Beschleunigen der Last zusätzlich Druck aufgebaut werden muss. Entsprechendes gilt selbstverständlich beim Senken der Last. Durch Erfassen dieser Lastzustände ist es bei der vorliegenden Erfindung möglich, auf diese beim Druckaufbau kurz vor dem Lösen der mechanischen Bremse einzugehen, so dass selbst in solchen Situationen ein ruckfreies Anfahren des Hubwerks möglich ist.Furthermore, it is possible for the prevailing operating state to be detected before the closing, in particular immediately before the closing of the mechanical brake, ie, a distinction is also made between the lifting and lowering of a load. This distinction ultimately allows the controller to charge a value determined in dependence on the load condition with the measured actual pressure. It is easy to imagine that shortly after lifting a load in front of the hydraulic motor, a higher pressure prevails than when holding the same load, since additional pressure has to be built up to accelerate the load. The same applies of course when lowering the load. By detecting these load conditions, it is possible in the present invention to respond to this during pressure build-up shortly before the release of the mechanical brake, so that even in such situations, a smooth start-up of the hoist is possible.

Werden unterschiedliche Lasten gehoben, kann immer der Lastdruck unmittelbar vor dem Schließen der mechanischen Bremse zugrunde gelegt werden. Hierbei kann von der Steuerung unterschieden werden, ob zuletzt eine Last gehoben oder gesenkt wurde.If different loads are lifted, the load pressure can always be used immediately before closing the mechanical brake. In this case, it can be distinguished from the controller whether a load was last lifted or lowered.

Es ist ferner denkbar, dass das erfindungsgemäße Verfahren sowohl beim Heben als auch beim Senken bzw. vor dem Heben als auch vor dem Senken einer Last ausnahmslos Anwendung findet, jedoch kann das erfindungsgemäße Verfahren auch in bestimmten Situationen ausgesetzt werden, insbesondere dann, wenn der Lastdruck bzw. der gemessene Ist-Druck einen vorher festgelegten Wert unterschreitet.It is also conceivable that the method according to the invention invariably applies both during lifting and when lowering or before lifting and before lowering a load, however, the method according to the invention can also be suspended in certain situations, in particular when the load pressure or the measured actual pressure falls below a predetermined value.

Ferner kann gemäß einer bevorzugten Ausführungsform beim Heben der Last lediglich die mechanische Bremse und beim Senken der Last sowohl die mechanischen Bremse als auch das Senkbremsventil geöffnet werden, um eine zusätzliche Sicherung der Last bereitzustellen.Furthermore, according to a preferred embodiment when lifting the load, only the mechanical brake and when lowering the load, both the mechanical brake and the lowering brake valve can be opened to provide additional securing of the load.

Die Erfindung wird im Folgenden anhand einer bevorzugten Ausführungsform näher erläutert. Sie kann alle hierin beschriebenen Merkmale einzeln sowie in jedweder sinnvollen Kombination umfassen. Dabei zeigt die einzige beiliegende Figur 1 ein Schaltbild einer erfindungsgemäßen elektrohydraulischen Leck-Kompensationsvorrichtung für ein Mobilkran-Senkbremssystem mit einem offenen hydraulischen Kreis.The invention will be explained in more detail below with reference to a preferred embodiment. It may include all features described herein individually, as well as in any meaningful combination. It shows the only enclosed FIG. 1 a diagram of an electro-hydraulic leakage compensation device according to the invention for a mobile crane lowering brake system with an open hydraulic circuit.

Die Vorsteuerventile für Heben 1 und Senken 10 betätigen den Steuerschieber 2 und lenken das Hydrauliköl in die Heben- oder Senkenleitung 3 bzw. 11. Das Bremslüftventil 8 öffnet beim Heben die mechanische Bremse 9. Beim Senken werden mechanische Bremse 9 und Senkbremsventil 4 geöffnet. Die Hubwinde ist über das Getriebe 6 und die mechanische Bremse an den Hydraulikmotor 5 gekoppelt, an dessen Lastseite 12 sich das Senkbremsventil 4 befindet. Der Lastdruck wird mit Hilfe des Drucksensors 13 ermittelt, der sich auf der Lastseite des Senkbremsventils 4 befindet, wo eine Bohrung mit einer Rohrbruchsicherung 14 versehen, als Anschluss dient.The pilot valves for lifting 1 and lowering 10 actuate the spool 2 and direct the hydraulic oil in the lifting or lowering line 3 and 11. The brake release valve 8 opens when lifting the mechanical brake 9. When lowering mechanical brake 9 and lowering brake valve 4 are opened. The hoist winch is coupled via the gear 6 and the mechanical brake to the hydraulic motor 5, on the load side 12, the lowering brake valve 4 is located. The load pressure is determined by means of the pressure sensor 13, which is located on the load side of the lowering brake valve 4, where a bore provided with a pipe rupture protection 14, serves as a connection.

Der Hebevorgang läuft automatisch in nachstehend beschriebener Reihenfolge ab:The lifting process will take place automatically in the following order:

Das Vorsteuerventil für Heben 1 öffnet den Steuerschieber 2 in Hebenrichtung. Das Hydrauliköl gelangt über die Hebenleitung 3 und das Senkbremsventil 4 zum Hydraulikmotor 5. Zwischen Senkbremsventil 4 und Hydraulikmotor 5 wird im Raum 12 die Leckage des Hydraulikmotors 5 kompensiert, bis sich der Lastdruck des vorherigen Heben- oder Senkenvorgangs einstellt. Mit dem Bremslüftventil 8 wird die mechanische Bremse 9 geöffnet, die zwischen Hydraulikmotor und mechanischem Getriebe angeordnet ist. Der Hydraulikmotor treibt über das mechanische Getriebe 6 die Hubwinde 7 an.The pilot valve for lifting 1 opens the spool 2 in the lifting direction. The hydraulic oil passes through the lifting line 3 and the lowering brake valve 4 to the hydraulic motor 5. Between lowering brake valve 4 and hydraulic motor 5, the leakage of the hydraulic motor 5 is compensated in space 12 until the load pressure of the previous lifting or lowering process sets. With the brake release valve 8, the mechanical brake 9 is opened, between the hydraulic motor and mechanical Gear is arranged. The hydraulic motor drives the hoist winch 7 via the mechanical transmission 6.

Der Senkenvorgang läuft automatisch in nachstehend geschriebener Reihenfolge ab:The sinking process runs automatically in the following order:

Das Vorsteuerventil für Heben 1 öffnet den Steuerschieber 2 in Hebenrichtung. Das Hydrauliköl gelangt über die Hebenleitung 3 und das Senkbremsventil 4 zum Hydraulikmotor 5. Zwischen Senkbremsventil 4 und Hydraulikmotor 5 wird im Raum 12 die Leckage des Hydraulikmotors 5 kompensiert, bis sich der Lastdruck des vorherigen Heben- oder Senkenvorgangs einstellt. Das Vorsteuerventil für Senken 10 öffnet den Steuerschieber 2 in Senkenrichtung. Das Hydrauliköl gelangt über die Senkenleitung 11 zum Hydraulikmotor 5. Mit dem Bremslüftventil 8 wird die mechanische Bremse 9 geöffnet, die zwischen Hydraulikmotor 5 und mechanischem Getriebe 6 angeordnet ist. Gleichzeitig wird das Senkbremsventil 4 entsprechend der gewünschten Senkgeschwindigkeit geöffnet. Der Hydraulikmotor 5 treibt über das mechanische Getriebe 6 die Hubwinde 7 an.The pilot valve for lifting 1 opens the spool 2 in the lifting direction. The hydraulic oil passes through the lifting line 3 and the lowering brake valve 4 to the hydraulic motor 5. Between lowering brake valve 4 and hydraulic motor 5, the leakage of the hydraulic motor 5 is compensated in space 12 until the load pressure of the previous lifting or lowering process sets. The pilot valve for lowering 10 opens the spool 2 in the lowering direction. The hydraulic oil passes via the drain line 11 to the hydraulic motor 5. With the brake release valve 8, the mechanical brake 9 is opened, which is arranged between the hydraulic motor 5 and the mechanical transmission 6. At the same time, the lowering brake valve 4 is opened according to the desired lowering speed. The hydraulic motor 5 drives the hoist winch 7 via the mechanical transmission 6.

Claims (14)

  1. An electro-hydraulic leak compensating device for a mobile crane lowering brake system in an open hydraulic circuit including a hydraulic motor (5) which is coupled to a lifting unit (6, 7), a lowering brake valve (4) and a mechanical brake (9), comprising a pressure sensor (13) which measures the hydraulic pressure prevailing in the hydraulic circuit on the load side of the hydraulic motor (5) and/or on the side of the lifting conduit (3) before the mechanical brake (9) is closed, in particular immediately before it is closed, characterised in that a pump of the mobile crane delivers fluid from the lifting conduit (3) into the volume (12) between the hydraulic motor (5) and the lowering brake valve (4) in order to build up pressure before the mechanical brake (9) is opened.
  2. The leak compensating device according to claim 1, characterised in that a control unit stores the measured pressure as an actual pressure, and a pump of the mobile crane causes fluid to be delivered into a volume (12) between the hydraulic motor (5) and the lowering brake valve (4) before the mechanical brake (9) is opened, in order to compensate - preferably, fully automatically - for the pressure loss which occurred in the volume (12) during the time in which the mechanical brake (9) was closed.
  3. The leak compensating device according to claim 1, characterised in that the built-up pressure differs from the measured pressure in accordance with the load state.
  4. The leak compensating device according to any one of claims 1 to 3, characterised in that the hydraulic motor (5) is coupled to a lifting unit drum (7) via a gear (6) and the mechanical brake (9).
  5. The leak compensating device according to any one of claims 1 to 4, characterised in that the lowering brake valve (4) in the hydraulic circuit is disposed on the load side of the hydraulic motor (5) and/or on the side of the lifting conduit (3).
  6. The leak compensating device according to any one of claims 1 to 5, characterised in that the pressure sensor (13) in the hydraulic circuit is disposed on the load side of the lowering brake valve (4) and/or on the side of the lifting conduit (3).
  7. A method for electro-hydraulically compensating for leaks in a mobile crane lowering brake system in an open hydraulic circuit including a hydraulic motor (5) which is coupled to a lifting unit (6, 7), a lowering brake valve (4) and a mechanical brake (9), comprising the following method steps:
    - measuring the actual hydraulic pressure prevailing on the load side of the hydraulic motor (5) before the mechanical brake (9) is closed, in particular immediately before it is closed;
    - determining a desired pressure by setting off the measured actual pressure against a previously determined value in accordance with the load state;
    - generating the desired pressure in the volume (12) before the mechanical brake (9) is opened, wherein fluid is delivered from the lifting conduit (3) into the volume (12) in order to build up pressure.
  8. The method according to claim 7, characterised in that the method steps are performed fully automatically before a load is lifted or lowered.
  9. The method according to any one of claims 7 or 8, characterised in that the prevailing operating state is detected and in particular a distinction is made between lifting and lowering a load before the mechanical brake (9) is closed, in particular immediately before it is closed.
  10. The method according to any one of claims 7 to 9, characterised in that the method is applied both during/before lifting and during/before lowering a load.
  11. The method according to any one of claims 7 to 10, characterised in that the method is not applied if the load pressure, in particular the measured actual pressure, drops below a previously determined value.
  12. The method according to any one of claims 7 to 11, characterised in that the mechanical brake (9) is opened when lifting the load, and the mechanical brake (9) and the lowering brake valve (4) are opened when lowering the load.
  13. The method according to any one of claims 7 to 12, characterised in that the actual pressure is measured on the load side of the hydraulic motor (5) and/or on the side of the lifting conduit (3).
  14. The method according to any one of claims 7 to 13, characterised in that the actual pressure is measured on the load side of the lowering brake valve (4) and/or on the side of the lifting conduit (3).
EP20090158346 2008-05-21 2009-04-21 Electro-hydraulic leak compensation Active EP2123593B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810024512 DE102008024512B4 (en) 2008-05-21 2008-05-21 Electrohydraulic leak compensation

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EP2123593A1 EP2123593A1 (en) 2009-11-25
EP2123593B1 true EP2123593B1 (en) 2012-05-23

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US (1) US8167154B2 (en)
EP (1) EP2123593B1 (en)
JP (1) JP2009280402A (en)
KR (1) KR101184151B1 (en)
CN (1) CN101585498B (en)
CA (1) CA2666297C (en)
DE (1) DE102008024512B4 (en)
ES (1) ES2388367T3 (en)

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DE102008024512A1 (en) 2010-01-28
KR20090121233A (en) 2009-11-25
US8167154B2 (en) 2012-05-01
CN101585498B (en) 2013-07-03
EP2123593A1 (en) 2009-11-25
CA2666297A1 (en) 2009-11-21
CN101585498A (en) 2009-11-25
ES2388367T3 (en) 2012-10-11
US20090294746A1 (en) 2009-12-03
KR101184151B1 (en) 2012-09-18
CA2666297C (en) 2012-02-21
DE102008024512B4 (en) 2010-08-12
JP2009280402A (en) 2009-12-03

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