Grab by the bucket body and host of two parts. Host is a crawler crane Shandong grab, rope single rope grab cranes lifting force shall not be less than 120kN; hydraulic grab crawler crane hydraulic system should be configured. Many grab itself with inclinometer and Straightening device capable of sensing and correcting machine body through sensors and hydraulic systems skewed. Grab and sediment are crawling all kinds of bulk goods can open and close the bucket. About mainly by a combination of two or more of the bucket jaw opening and closing gripping and unloading bulk material spreader. Grab the left and right by a combination of two or more of the bucket jaw opening and closing gripping and unloading bulk material spreaders, grabs consisting of a plurality of jaw, also called gripper.