The invention relates to a timber handling vehicle (1) and a timber grip, wherein said timber handling vehicle includes a load compartment (2), a crane (3) a timber grip (4), a hydraulic cylinder (4c), a hydraulic system (11, 12), a pump (15), a tank (16), a control valve (18) with which a fluid flow set under a pump feed pressure (P) is directed to a plus side (15:1) via a first pipe (15A) respectively a minus side (15:2) via a second pipe (15B). For efficient timber handling, the hydraulic system (11, 12) includes a third pipe (15C), which results in a regenerative fluid flow from the minus side (15:2) to the plus side (15:1) of the hydraulic cylinder (4c), a valve means (21) in the second pipe (15B), which valve means (21) is configured to; drive in a first operating condition, where the valve means (21) is closed and fluid flow from the minus side (15:2) to the plus side (15:1) of the hydraulic cylinder is directed via said third pipe (15C), receive a pressure indication that indicates a pump feed pressure (P) on the plus side (15:1) of the hydraulic cylinder (4c), determine whether the pump feed pressure (P) exceeds a first operating condition threshold value (Z1) and, if so, drive in a second operating condition, where the valve means (21) is open, and fluid flow from the minus side (15:2) of the hydraulic cylinder (4c) is directed to the tank (16).


    Access

    Download


    Export, share and cite



    Title :

    ADAPTIVE CONTROL OF A HYDRAULIC TIMBER GRIP ON A TIMBER HANDLING DEVICE


    Contributors:

    Publication date :

    2023-08-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66C Krane , CRANES / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



    Adaptive control of a hydraulic timber grip on a timber handling device

    MÄKI FREDRIK / LARSSON JONAS | European Patent Office | 2023

    Free access

    ADAPTIVE CONTROL OF A HYDRAULIC TIMBER GRIP ON A TIMBER HANDLING DEVICE

    MÄKI FREDRIK / LARSSON JONAS | European Patent Office | 2024

    Free access

    ADAPTIVE CONTROL OF A HYDRAULIC TIMBER GRIP ON A TIMBER HANDLING DEVICE

    MÄKI FREDRIK / LARSSON JONAS | European Patent Office | 2022

    Free access

    ADAPTIVE CONTROL OF A HYDRAULIC TIMBER GRIP ON A TIMBER HANDLING VEHICLE

    MAKI FREDRIK / LARSSON JONAS | European Patent Office | 2022

    Free access

    Handling of timber imports

    Patterson, D. | Engineering Index Backfile | 1963