Dredging grab is an effective tool for dredging silt/gravel and dredging the channel under water with the crane of engineering ship.
 

The opening and closing of the grab can be opened and closed by the lifting mechanism wire rope. and the closing force of the grab can be realized by the pulley block of grab. The ratio of the pulley group generally is 4~ 7, the excavation force is large with large ratio of pulley group.

 

The grab is composed of guide rope device, upper bearing beam, support rod, lower bearing beam, upper and lower pulley block, bucket, etc.

 

The grab feature is simple structure, convenient operation, high efficiency and little failure.

 

Usually the grab bucket is a hyperboloid, which is beneficial to excavate and reduce the tension of the bucket when leave the water.

 

Connected with the crane: the four wire ropes of the grab can be used when they are connected with the wire rope of the crane.

 

Hydraulic dredging grab is an effective tool for under water dredging the silt/gravel and dredging the channel, It work with the hydraulic excavator on the engineering ship.

 

Grab by two kinds of structure forms: one kind is oil cylinder in the middle of the grab, grab have a support rod, upper bearing beam, The oil cylinder were installed in the upper bearing beam and lower bearing beam, connect to grab on the excavator oil cylinder, control the telescopic of oil cylinder, then it can realize the opening and closing of the grab bucket. The another kind of oil cylinder in the sides of the grab bucket without support rod, only have middle beam, the middle beam connects the two bucket valve, the oil cylinder installed in the up of middle beam and two bucket disc, control the telescopic of oil cylinder then it can realize the opening and closing of the grab bucket.

 

抓斗的特点是结构简单，操作方便，效率更高，故障少。这种抓斗受到挖掘机大臂长度、承载力的限制，抓斗斗容一般不大，疏浚的深度也有限。

The grab feature is simple structure, convenient operation, higher efficiency and less failure. This type of grab is limited by the length and carrying capacity of the excavator, which is generally small and the depth of dredging is limited.

 

船用四索抓斗是配在散货船双联双卷筒克令吊下，通过控制克令吊钢丝绳的上升与下降来实现装卸矿粉、煤炭、粮食、化肥、黄沙等散货的有效工具。

Four rope marine grab is working with Double double reel deck crane on the bulk cargo ship. By controlling the rise and fall of wire rope of deck crane for loading and unloading of mineral powder, coal, grain, fertilizer, sand and other bulk cargo.

 

抓斗特点：结构简单，操作方便，效率高。抓斗斗体可变容，在抓斗的后背角上设有可拆装的溢料板，根据不同物料拆装溢料板，以适用抓取不同的货种。如额定载荷为24t船用四索抓斗，自重9.6t，抓货量14.4t，斗容可变6~12/m3，如果抓铁矿石，铁矿石的比重为2.4t/m3，这时将溢料板全部拆除，斗容是6 m3，抓货量刚好是14.4t。如果抓煤炭，煤炭的比重为0.85~1.1t/m3，这时将溢料板装上，斗容是12 m3，抓货量小于额定抓货量，安全。

Grab features: simple structure, convenient operation and high efficiency. Grab bucket body with variable capacity, in the rear corner of the grab bucket is equipped with a removable overflow board.

与起重机连接方式：抓斗的四根钢丝绳分别与起重机上的钢丝绳连接就能使用。

Connected with the crane: the four wire ropes of the grab can be used when they are connected with the wire rope of the crane.