Some materials can be easy to grab but very difficult to unload because the material sticks to the grab.
Nickel ore and bentonite (when moist) are examples of this. Especially for sticky materials Verstegen
developed a grab with an adjusted "smooth scale design" and with special liners with an extreme low
friction coefficient. As a result even the stickiest materials will easily slide out of the grab scales
1in the ship crane, in the status of loading hooper.
Advantage
No stacking angle of dead. Bucket structure as open design, no stacking angle of dead.
No need clean bucket, Will not squeeze material on the process ,So nickel ore is loose and massive , All material will fall down clearly and easy when unloading. Nothing paste inside bucket.
No need close bucket when return to ship, As all material drop cleanly ,So no need close bucket when return ship.
No pollution and loss , No materials will drop to the dock and sea, In case pollution and the loss can be controlled.
Smaller dead weight
The dead weight similar to other clamshell grab .Compared with orange peels ,this grab is much light weight, and handle more material .
Problems of other grabs previously
Low work efficiency
The nickel is viscous bulk including bauxite, clay which is serious sticky . Other grabs process make extrusion of material ,so always need to be clean inner bucket when unloading.
Pollution and loss
Others grab need close bucket peels before return to ship for next working circle,Otherwise lead leakage phenomenon and loss.
