品名：起重機抓斗

操作：抓斗張開操作：把起升與開閉同時下降到適當位置，停止起升下降，開閉繼續下降，抓斗逐漸張開，完成張開動作。
　　　抓斗閉合操作：開閉卷筒作起升操作，抓斗上部滑輪組不動，下部滑輪組作向上移動，到抓斗抓齒相互交叉相碰，抓斗的閉合動作完成。在閉合過程中，起升卷筒作適當的起升操作，使升降鋼絲繩不下垂為限。
　　　抓斗的上升、下降操作：抓斗無論是張開或閉合狀態，均可作上升或下降操作。在操作時，升降與開閉卷筒必須同時進行。

應用：廣泛用于港口、碼頭、車站貨場、礦山等方面裝載各種散貨、圓木、礦物、煤炭、砂石料、土石方等。

Item description: grab crane

Operation: open operation: grab the lifting with the opening and closing down to the appropriate location at the same time, to stop lifting down, opening, continue to fall, grab gradually open, complete the open action.

Closed grab operation: open and close drum lifting operation, grab the upper pulley block, the lower pulley block move up, to grab grab teeth into overlapping, grab the closing of the action is complete. In the process of closing, the hoisting drum for proper lifting operation, make the elevator wire rope or not.

Grab the rise and fall of operation: grab either open or closed state, can make up or down operation. In operation, lifting and reel should be carried out at the same time.

Application: widely used in port, dock, station yard, mine loading various aspects such as bulk, logs, minerals, coal, ballast, conditions, etc.