Hydraulic gripping device controlling method for earth work, involves engaging cylinders with lever arms, where cylinders are loaded with pressure for introducing closable movement of pivoted grab shells from opening position

摘要

The method involves mounting grab shells (16, 18) on a bearing shaft (19) at a shell support (12), where the grab shells are pivoted from each other. Cylinders (26, 41) are engaged with lever arms (34, 48) to transmit force to the pivoted grab shells, where the lever arms differ from each other. The cylinders are loaded with pressure for introducing a closable movement of pivoted grab shells from an opening position, where one of the cylinders is initially loaded with the pressure during the closable movement of the pivoted grab shells. An independent claim is also included for a hydraulic gripping device for gripping, digging, supporting or crushing a stopping structure or recycling structure, comprising a supporting unit.