Marine Folding Boom Cranes: Versatile Powerhouses for Maritime Operations

In the dynamic and challenging realm of marine operations, efficiency, safety, and adaptability are of utmost importance. Marine folding boom cranes have emerged as essential equipment, playing a pivotal role in a wide range of maritime activities. These cranes are engineered to meet the unique demands of the marine environment, offering a combination of strength, flexibility, and precision.

Design and Structure​

Marine knuckle boom cranes typically feature a compact and robust design. The boom, often made of high-strength steel alloys, is designed to withstand the harsh marine conditions, including corrosive saltwater, strong winds, and heavy loads. The folding mechanism allows the offshore crane to be stowed in a smaller space when not in use, which is particularly beneficial on vessels where deck space is at a premium. For example, many folding boom cranes have an articulated jib or "knuckle jib" that can be folded back, minimizing the pendulum effect and reducing the space required for storage.​

The overall structure of the crane is divided into key components such as the base unit, rotary devices, and the boom. The base unit provides stability and is securely mounted to the deck of the ship or platform, either by welding or using bolts. The rotary devices enable the crane to rotate horizontally, typically offering a 360° continuous rotation option, allowing for precise positioning of the load. Some models are equipped with fail-safe brakes on all movements to ensure safety in case of power loss or system malfunctions.

Working Principles​

The operation of marine electric hydraulic cranes is based on a combination of hydraulic and mechanical systems. Hydraulic power is commonly used to drive the various functions of the crane. The motor directly drives a pump that generates pressure oil, which is then routed through the hydraulic system to the executing agencies. This enables smooth and controlled movements for lifting, rotation, and amplitude adjustments.​

For instance, when lifting a load, the hydraulic system powers the hoisting mechanism. The lifting crane operator can control the speed and direction of the lift, with hoisting speeds typically adjustable to suit different load requirements. The slewing speed, which determines how fast the crane rotates, is also precisely controllable. Additionally, the luffing function, which adjusts the angle of the boom, is achieved through the extension and retraction of hydraulic cylinders. This allows the crane to reach different heights and distances, making it suitable for a variety of tasks.​

Standard features

1. Lifting capacity up to 600t single line / 900t double fall
2. In-house developed control system
3. Main winch wire capacity up to 4,000m
4. Main winch can be mounted on the crane or below deck
5. Auxiliary winches with up to 50t SWL and 4000m wire capacity
6. Fully-equipped, spacious, air-conditioned, ergonomically designed operator cabin

Marine knucle boom cranes are integral to the success of marine operations. Their robust design, efficient working principles, and wide range of applications make them essential equipment in marine engineering, ports and terminals, and ship operations. With special features and customization options available, they can be tailored to meet the unique needs of different maritime projects. As the marine industry continues to evolve and expand, the importance of these versatile cranes will only increase, driving efficiency, safety, and productivity in the challenging marine environment.


Post time: Jun-16-2025
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