Knuckle type jib cranes are very advantageous due to their compact structure which minimizes the space occupied on the platform/deck of the ships. The operation of a folding-jib system is very flexible and changeable. The hook can easily reach sea surface even the wire rope is not spooled off from the drum, which enhances the precision of material handling operation, especially for fishing boats.
These type of cranes have widely employed fishing boats, research boats, engineering vessels and subsea operation vessels. The articulated jib, also named as “knuckle jib” or “folding jib”, can be presented positioned close to the load. This maneuver minimizes the pendulum effect. Moreover, more space on deck will be available for vessels primary operations, since the parking space required for the crane is very limited.
One electric motor mounted vertically in crane column drives the main variable displacement pump. The hydraulic circuit is of open loop type with load sensing feedback control. Built-in heaters in the oil tank and a separate cooling circuit is implemented to ensure cranes operation in severe climatic conditions.
Both pressure line and return line filters include digital clogging indicators. Built in hydraulic oil tank in crane tower together includes fluid level low switch, temperature and pressure gauges with a digital indicator, breather, cover for cleaning, oil level sight glass together with thermometer and heaters.
Distribution of the generated fluid power is directed to consumers by using the “Crane Type” servo-proportional valve. This valve enables independent operation of systems with speed control. Hoisting, luffing and slewing movements of the crane are controlled by joysticks on operator’s console. All movements are proportionally controllable from zero to max speed.