Described is a lifting machine, comprising a main frame (2), at least a first (3) and a second rolling element (4) rotatably associated with the frame (2) for moving it along the ground or a supporting surface (G), at least one arm (5) telescopically and/or rotatably associated with the frame (2), comprising at a free end (5a) an operating element (7), first (8) and second hydraulic actuating devices (9) associated respectively with the rolling elements (3, 4) and the arm (5) to move them, at least a first (10) and a second hydraulic pump (11) respectively associated with the first (8) and the second actuating devices (9) for feeding them with an operating fluid, a hydraulic circuit (14) designed to put in fluid communication the pumps (10, 11) and the first (8) and second actuating devices (9) and comprising a selecting unit (17) switchable between a first configuration in which it puts the pumps (10, 11) in fluid communication with first actuating devices (8) and a second configuration in which it puts at least the first pump (10) in fluid communication with the second actuating devices (9) and at least an electric motor (15) associated with the pumps (10, 11) for operating them. The machine also comprises a comprises a control unit (18) associated with the selecting unit (17) and designed to control it, when the selecting unit (17) is in the second configuration, in such a way as to also put the second pump (11) in fluid communication with the second actuating devices (9) and to vary the flow rate of operating fluid from the second pump (11) to the second actuating devices (9) depending on a trend of the pressure of the operating fluid in the first pump (10).


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    Title :

    LIFTING MACHINE


    Additional title:

    HUBMASCHINE
    MACHINE DE LEVAGE


    Contributors:

    Publication date :

    2016-03-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66C Krane , CRANES / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / E02F Baggern , DREDGING / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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