FIELD: machine building.
SUBSTANCE: invention relates to lifting mechanisms (11) of working machine. Lifting mechanism comprises rotary device (12) equipped with connectors (13) for connection of working medium pipelines (14) with rotary device, boom (15), from which pipelines for working medium under pressure are made with possibility of direction to rotation device, hinged connection (17) for suspension of rotation device on boom. Hinged joint comprises two consecutive hinges (22, 23) in rotary device longitudinal direction. Hinge rotation axes are located at right angles to each other, and wherein pipelines for working medium under pressure are made with possibility of laying between sockets (24) of hinge (22) on the side of articulated boom jib. Pipelines for working medium under pressure are arranged with the possibility of being laid past connectors of rotation device in longitudinal direction of rotation device and for rotation in direction of connectors with formation of loop (18) of hoses and with possibility of laying to connectors of rotation device, which are located on both sides (A, B) of rotation device, associated with plane formed in boom lengthwise direction and lengthwise direction of rotation device.
EFFECT: providing free rotation for hinged connection and longer service life of pipelines for working medium under pressure and their connections.
12 cl, 6 dwg
