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There are five kinds of five kinds: single rope, double rope, four-rope, motor and hydraulic pressure. The multi-lobe clamshell is suitable for materials with poor environment, irregular and difficult material. Such as garbage, ore, scrap iron, aluminum ingots, limestone, gravel, etc., for handling and transferring, it is widely used in landfill, scrap mill, port, mine and railway.

At the start of the work, support will grab lifting rope on the appropriate location, and then put down the opening and closing wire rope, at this moment on the beam under the gravity force of a pipe of beam shaft as the center to open, when the bucket of open to the ears of touch boards collide, the bucket of open to the limit. Beam in a bucket, pulleys and beams under the roller center distance increase, and set support rope, will have to open the grab, fall on to grab the loose debris, and then closed around closed steel wire rope, the center distance of the beam under the pulley and the beam pulley on the back to its original position, thus complete the grab materials process.