The four-rope grab is mainly used with two sets of bridge or door type hoisting, which can be used in two sets of lifting drum, and grab all kinds of loose deposit, and carry on loading, unloading, rolling and loading etc. According to grab material category and user request can be designed with teeth, parallel girder open, underwater operation and other forms.

The four-rope grab consists of pole brace, jaw plate and beam. Four rope grab taking action on crane hoisting drum and controlled drum, two root on the hoisting drum winding rope end fixed on the wedge of grab the head shell, shell and wedge grab articulated head, hoisting drum rotates the lead wire rope through the wedge shell grab the rise and fall; The two wire ropes wound around the open coils are wrapped around the pulley between the grab head and the beam and control the opening and closing of the grab. Picking, grab with open state to dump on the fixed time when open and close drum), is open and close the hoisting direction to start the drum (hoisting rope fixed), in the grab bucket under the action of gravity, grab jaw to dig into the material, grab the closed completely, open and close to start the hoisting drum and drum at the same time, will be full of grab ascend to a certain height, to start the move grab crane unloading location, moving in the direction of falling open closed drum (fixed hoisting drum), grab the opening unloading.