Among the spreaders of grab cranes , the four-rope grab and the double-rope grab are two commonly used. Some friends don’t know much about the four-rope grab and the double-rope grab. The editor will explain these two kinds of grabs for everyone. The difference between fighting.
The four-rope grab is mainly used in conjunction with a bridge or gantry crane with two sets of lifting drums to grab all kinds of loose deposits, and perform operations such as loading, unloading, and transferring materials. According to the material grabbing situation and user needs, it can be designed with teeth, parallel girder opening, underwater operation and other forms.
On all types of cranes, there are two sets of motor drums (ie electric hoist), each set of drums leads to two steel wire ropes, two of which are rooted in a group on both ends of the grab balance frame for supporting purposes, and the other set of steel wire ropes The pulley passing through the upper beam and the pulley of the lower beam form a pulley block, which plays the role of opening and closing the bucket. 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 filled with 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 the crane, and the grab is opened to unload the grabbed materials.
The double-rope grab is suitable for all types of cranes with double-lifting mechanisms (single rope), and is mostly used in industries such as ports, docks, and roads and bridges. According to the material characteristics, it can be equipped with light, medium, heavy, and super heavy. It is suitable for grabbing all kinds of loose accumulations.
On all types of cranes, there are two sets of motor drums (ie electric hoist). Each set of drums leads out a steel wire rope, one of which is used for support at both ends of the grab gimbal, and the other wire rope passes through the upper beam. The pulley and the pulley of the lower beam form a pulley block, which plays the role of opening and closing the bucket.
At the beginning of the work, support the wire rope to hoist the grab in the proper position, and then lower the opening and closing wire rope. At this time, the weight of the lower cross beam forces the bucket to be opened centered on the large axis of the cross beam below the bucket. When the blocks 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 filled with 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 the crane, and the grab is opened to unload the grabbed materials.
The main difference between a four-rope grab and a double-rope grab is the number of wire ropes drawn from the crane.
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