Grab bucket is a special tool for crane to grab dry goods. It is composed of two or more buckets of jaw plates that can be opened and closed together to form a container space. When loading, the jaw plate is closed in the material pile, and the material is grabbed into the container space. When unloading, the jaw plate is opened in the suspended state of the material pile, and the material is scattered on the material pile. Grab is the main dry bulk cargo handling tool in the port. According to the type of cargo, it can be divided into ore grab, coal grab, grain grab, wood grab and so on.