CRANE MOBILE COUNTERWEIGHT Russian patent published in 2021 - IPC B66C23/76 

FIELD: crane construction.

SUBSTANCE: invention relates to the field of crane construction, namely to cranes equipped with counterweights. The crane contains a chassis, a rotary platform with a power plant and a cable winch for lifting the load, a boom with a device for lifting it and a movable counterweight, additionally equipped with a counterweight lifting winch, which is connected to a load lifting winch through a planetary differential, where the ring gear is made integral with the winch drum counterweight, the carrier is connected to the drum of the load lifting winch, and torque from the power plant is supplied to the sun gear of the planetary differential. The counterweight is movably fixed on two hinged four-link arms located on the sides of the turntable, the four-link arms are oriented in the longitudinal-vertical plane. The turntable of the crane is a four-link arm stand, and the elongated lever with a counterweight at the lower end is a connecting rod, they are connected to each other by vertical levers - front and rear rocker arms. The load from the transported load through the planetary differential acts on the counterweight drum, then through the rope thrust - diagonally to the tops of the four-link, synchronously changing the counterweight overhang depending on the load on the lifting hook. There is a kinematic connection between the crane boom and the hinged four-link arms, by means of which the four-link arm linkage is tilted, consisting of a thrust and a rocker arm, where the thrust connects the boom to the upper end of the rocker arm, which is hinged to the crane turntable, and the front rocker arm of the hinged four-link arm is attached to the lower end of the rocker arm.

EFFECT: reduction of alternating loads on the turntable.

2 cl, 4 dwg