how to select the grab

How to select the grab

First of all, according the crane to select the grab power form. According to the definition of the grab: grab is material handling device under the crane, so even the most advanced grab, also cannot leave the crane and work independently. Conversely, the advanced and large tonnage ship unloaders also can not be produced effectively without the grab. So what kind of crane should match what kind of grab, mismatched can not use, match overload also cannot use. For example: hoist lifting drum is a single, should match the mechanical grab, only can match a single rope grab, if equipped with four rope grab, the grab can not work; The crane's rated weight is 25T, which only can be matched with the SWL =<25T, if overloaded with cranes it will not safe. 

Second, according to the loading and unloading of cargo to select the grab structure form. According to the definition of grab: grab is used for loading and unloading all kinds of goods. So what kind of goods to load, should match with the corresponding grab. If with the unmatch grab, it's not inefficient, just doesn't work. For example, the loading and unloading is coal, which is equipped with a light clamshell grab, and the loading and unloading efficiency will reduce at least 50% if the heavy mining clamshell grab is equipped; The loading and unloadin is coal, and it is equipped with a clamshell grab, which cannot be used if there is tooth-type timber grab.