Crane is a special tool for grabbing dry and bulk goods. The container space is composed of two or more bucket shaped jaw plates that can be opened and closed. When loading, the jaw plate is closed in the material pile, and the materials are grabbed into the container space. When unloading, the jaw plate is opened when the material pile is suspended, and the materials are scattered on the material pile. The opening and closing of the jaw plate is generally controlled by the steel wire rope of the lifting mechanism of the crane. Grapple operation has no heavy physical labor, which can achieve high loading and unloading efficiency and ensure safety. It is the main dry bulk cargo loading and unloading tool in the port. According to the type of operation goods, it can be divided into ore grab, coal grab, grain grab, wood grab, etc.
