ELECTRO-HYDRAULIC LEAKAGE COMPENSATING APPARATUS AND ELECTRO-HYDRAULIC LEAKAGE COMPENSATING METHOD

PROBLEM TO BE SOLVED: To provide a leakage compensating apparatus for a mobile crane lowering brake system in an open hydraulic circuit with one or more lifting units. SOLUTION: This electro-hydraulic leakage compensating apparatus for the mobile crane lowering brake system in the open hydraulic cir...

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Bibliographische Detailangaben
Hauptverfasser:	HEIDRICH THOMAS, SCHUERMANN JOHANNES
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CAPSTANS CRANES DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HAULING HEATING HOISTING HOISTS HYDRAULICS OR PNEUMATICS IN GENERAL LIFTING LIGHTING LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES MECHANICAL ENGINEERING PERFORMING OPERATIONS SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TACKLES, e.g. PULLEY BLOCKS TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TRANSPORTING WEAPONS WINCHES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a leakage compensating apparatus for a mobile crane lowering brake system in an open hydraulic circuit with one or more lifting units. SOLUTION: This electro-hydraulic leakage compensating apparatus for the mobile crane lowering brake system in the open hydraulic circuit comprises a hydraulic motor 5 combined with the lifting units 6, 7, a lowering brake valve 4 and a mechanical brake 9, and a pressure sensor 13 measuring oil pressure prevailing on the load side of the hydraulic motor in the hydraulic circuit and on the lifting conduit 3 side immediately before the mechanical brake is closed. An electro-hydraulic leakage compensating method comprises steps of measuring actual pressure prevailing on the load side of the hydraulic motor immediately before the mechanical brake is closed; determining a desired pressure by setting off the measured actual pressure against a previously determined value depending on the load state; and generating the desired pressure in a volume part 12 before the mechanical brake is opened. COPYRIGHT: (C)2010,JPO&INPIT