Hydraulic grab is through hydraulic power source to provide power for the hydraulic oil cylinder, so as to drive around the combination of two or more fights jaw opening and closing of the grab and discharged a working device, loose materials composed of multiple jaw bucket also called gripper.

The shape can be divided into shell and orange clamshell, the former consists of two complete bucket components, which consist of three or more jaw plates.

The driving mode can be divided into two types: hydraulic clamshell and mechanical bucket.

(1) hydraulic clamshell

The hydraulic clamshell itself is fitted with an open structure, usually driven by a hydraulic cylinder, and hydraulic clamshell made up of multiple jaw plates is called hydraulic claw. Hydraulic clamshell is widely used in hydraulic special equipment, such as hydraulic excavator and hydraulic lifting tower.

A special hydraulic excavator grab Divided into rotary and not turning two, do not turn back to grab the excavator bucket cylinder oil, don't need to add other hydraulic valve block and line; The grab bucket that brings back is to add a set of hydraulic valve block and conduit to control.

Application of hydraulic grab for excavator:

Excavation of foundation pit of building foundation, deep pit excavation and loading of mud, sand, coal and gravel.

Specially suitable for excavation and loading on one side of the trench or restricted space.

Applicable to the loading and unloading of ships, trains and automobiles.

(2) mechanical grab

Mechanical gripper does not have an open structure, usually driven by a rope or a connecting rod.