一、Composition
Knuckle boom cranes are a working form of shipboard cranes; Knuckle boom cranes are usually composed of key components such as column, folding jib, basic jib, telescopic jib and hydraulic cylinder. These components work together to realize the various functions of the crane:
Column: As the support structure of the crane, the column carries the weight of the whole crane and provides a stable support platform for other components.
Folding Boom: Connected by the shaft, the folding boom can realize the function of folding and unfolding to adapt to different working environments and spaces. This design enables the folding jib crane to carry out lifting operations in narrow spaces.
Basic Boom and Telescopic Boom: The basic boom is the main part of the boom, while the telescopic boom is set inside the basic boom and slides relative to each other through the slider to adjust the length of the boom. This design allows the length of the boom to be adjusted according to the need, in order to adapt to the needs of different heights of operation.
Hydraulic Cylinder: As the power source to drive the movement of each part, the hydraulic cylinder drives the movement of each part through oil pressure to realize various functions of the crane.
二、Features
Knuckle boom crane has a series of remarkable functional features that enable it to adapt to the complex working environment at sea:
Adapt to the marine environment: special anti-corrosion treatment and sturdy structural design are adopted, which can resist the erosion of seawater and harsh marine climate conditions. It has good stability and resistance to wind and waves, which ensures that it can still work normally even when the ship is rocking.
Flexible operation: the design of the folding arm allows it to flexibly extend and fold in limited space, adapting to the complex layout on the ship. It is able to lift cargoes in multiple angles and directions to improve operational efficiency.
Strong loading capacity: after careful design and manufacture, it can withstand large loading weight to meet the demand of ship transportation and operation.
Precise control: Equipped with advanced control system, the operator can precisely control the movement of the boom and the lifting position of the cargo. For example, when lifting materials for oil rigs at sea, the marine jib crane can flexibly avoid surrounding obstacles and accurately lift heavy equipment to the designated position.
Safe and reliable: A variety of safety protection devices are installed, such as overload protection, limit protection, etc., to ensure the safety of operators and equipment.
一、Composition:
Marine straight stiff boom crane is mainly composed of electric motor, gear reducer, hydraulic system, wire rope, boom and other components. These components work together to enable the marine jib crane to fulfill the cargo loading and unloading tasks.
二、Features:
Free rotation: The jib of the marine straight boom crane can rotate freely on the water surface, which is convenient to adapt to different loading and unloading needs.
Height and span adjustable: By adjusting the height and span of the boom, the marine jib cranes can be adapted to the loading and unloading of different sizes and weights of cargoes.
Easy to operate: Marine jib cranes are usually equipped with advanced control system, which makes the operation easier and faster.
Strong carrying capacity: marine straight boom crane has a large carrying capacity, can meet the needs of the fishing boat loading and unloading of goods, especially in the sea fishing, aquaculture and water salvage and other fields, plays an irreplaceable role.
Difference between a knuckle boom crane and a stiff boom crane
一、Structure difference
A.Knuckle boom crane is a kind of offshore crane that adopts foldable design boom to adapt to different working environments and space constraints. The boom can be retracted and adjusted according to the work requirements to realize more flexible and efficient lifting operations. Picture shows as below.
1. The structure is relatively complex, and the boom is in the form of folding arm, which can be folded and retracted.
2. The boom can save space after folding, which is convenient for operation in narrow deck or cabin.
3. Knuckle boom cranes usually do not have winches and ropes, but utilize hydraulics to complete the lifting job.
4. relatively flexible operation, can be driven by multiple cylinders to realize complex lifting action, such as with load expansion and contraction.
B.Stiff boom crane is cargo ship crane where the main boom is connected to the lifting boom in a straight line, usually with a longer working jib length and can carry heavier objects. Its structure is relatively simple and intuitive, mainly composed of jib, turntable, telescopic boom, balance arm and other components.
1. The structure is relatively simple, and the boom is in the form of a straight arm.
2. The boom is usually long, which can provide a large working radius and lifting height.
3. The operation is relatively straightforward, usually realized by telescoping, luffing, winching and slewing movements.
二、Flexibility
1. Stiff boom cranes: although efficient in linear lifting operations, straight jib cranes are relatively inflexible in confined spaces or in scenarios where complex lifting operations are required.
2. Knuckle boom crane: Folding Jib Crane’s folding jib is designed to be folded, which can be retracted and adjusted according to the needs of the work, so as to adapt to different working environments and space constraints. This design makes it possible for folding jib cranes to carry out lifting operations in narrow spaces, which greatly improves the working efficiency and flexibility.
三、Operation and Maintenance
1. Deck Kncukle boom crane
a. The operation of folding jib cranes is relatively complicated because it needs to control the cooperative work of several hydraulic cylinders.
b. The maintenance cost is higher, because the hydraulic mechanism is more and complex.
c. Knuckle boom deck crane maintenance, the telescopic cylinders of the folding boom are all external, which is easy to disassemble and maintain.
2.Deck Stiff boom crane
a.The operation of the straight boom crane is relatively simple, and the crane master can operate it skillfully.
b. The stiff boom deck cranes maintenance cost is relatively low because the structure is relatively simple.
c. When maintenance, because the telescopic mechanism adopts the form of built-in cylinder + pulley rope row, the maintenance is more difficult.
四.Deck crane Prices and lead times
Deck Knuckle boom Cranes
1.Knuckle boom cranes have a high rate of importation of core components, therefore the price is usually higher.
2.The lead time is longer because some parts need to be imported from abroad.
Deck Stiff boom Cranes
1.Stiff boom cranes have been completely localized, so the price is relatively low.
2. The lead time is shorter because there are enough spare parts available in China.
