At the beginning of the work, support the wire rope to hoist the grab in a proper position, and then lower the opening and closing wire rope. At this time, the weight of the lower cross beam forces the large axis of the cross beam below the bucket to open the bucket. When the bucket is opened to the two lugs When the bumps collide, the bucket opens to the maximum limit.

When the bucket is opened, the center distance between the upper beam pulley and the lower beam pulley is increased, and then the wire rope is supported to fall, and the opened grab is dropped on the loose accumulation to be grasped, and then the opening and closing wire rope is retracted to turn the upper beam pulley The center distance with the lower beam pulley is restored to the original position, thus completing the material grabbing process. The closed bucket is full of materials, and finally the opening and closing wire rope is lifted, the entire grab is also hoisted, and moved to the required unloading site by a crane, and the grab is opened to unload the grabbed materials.