Knuckle Boom Marine Crane

Shanghai ENJUE Machinery Equipment Co., Ltd is one of the most experienced manufacturers and suppliers of knuckle boom marine crane in China. If you're going to buy custom knuckle boom marine crane made in China, welcome to get more information from our factory. For price consultation, contact us.

 

OEM & ODM Services Available

Degree of Rotation: 0–400°

Double Arm Marine Crane

Certifications: CCS, ABS, BV, RS, DNV, LR, NK, ISO9001, CE

 

What Is a Marine Crane?

A marine crane is a specialized lifting device engineered to perform transport operations within the marine environment. Its primary functions include transferring and transporting cargoes between ship-to-ship or ship-to-shore, conducting at-sea replenishment, and deploying or recovering underwater operating equipment. In essence, it is purpose-built to meet the unique challenges of handling materials on water.

 

Knuckle Boom Marine Cranes

Knuckle boom marine cranes feature a double-arm design and are powered by either electric motors or diesel fuel. These power sources drive hydraulic cylinders to extend and retract, precisely controlling the movement of the lifting boom to accomplish cargo transfer. Many models in this category are fully cylinder-driven and offer the ability to telescope while under load, adding further flexibility to lifting operations.

 

 

The knuckle boom marine crane is not a single, standalone mechanism - it is an integrated system in which multiple functional components are coordinated by a central control system. Each mechanism plays a distinct role, and together they complete the lifting task with precision and efficiency.

Lifting Mechanism

The lifting mechanism is primarily responsible for raising and lowering heavy objects. In most configurations, it consists of a hanging system combined with a winch. In addition, many knuckle boom marine cranes also rely on a hydraulic system to accomplish the lifting and lowering motions, providing smooth and controllable vertical movement of the load.

 

 Running Mechanism

The running mechanism handles horizontal movement. It is generally composed of a motor, a reducer, a brake, and wheels. Its purpose is twofold: to transport heavy loads longitudinally in a horizontal direction, and to adjust the working position of the crane as operational needs change. This allows the crane to reposition itself without interrupting the overall workflow.

 

Luffing Mechanism

The luffing mechanism adjusts the reach of the crane by changing the amplitude of the lifting arm, thereby meeting lifting requirements at different distances from the crane's center. Notably, a knuckle boom deck crane may be equipped with two separate luffing mechanisms, which significantly enhances its operational flexibility and allows for more refined control over load positioning.

 

 Slewing Mechanism

The slewing mechanism enables the lifting arm to rotate around the slewing center. This rotational capability allows the crane to adjust the lifting direction of the heavy load, making it possible to move materials across a wide arc without relocating the crane itself. Combined with the luffing mechanism, slewing gives the crane full directional control over the load.

 

 

Provision Cranes, Supply and Cargo Cranes, Fishing Cranes, Grab Cranes

The folding, telescopic, and articulated features of the jib are especially suitable for workplaces with limited space, short lifting distances, and frequent operations, such as harbors, wharves, cargo ships, passenger ships, railway stations, power stations, workshops, and so on.

We can design and produce different cranes according to different requirements and accept non-standard customization.

 

 

 

• Hoisting capacity up to 100T
• Jib radius up to 50 m
• Long-life surface treatment: corrosion protection
• External integrated electro-hydraulic drive / HPU
• Continuous slewing
• Adaptable to extreme environments
• Compact: articulated and folding design allows for maximum movement within limited deck space.
• Lighter weight: easy to install and reduces deck loads.
• Large load ratio: able to carry a large amount of weight while being light in its own weight.
• Conforms to ISO9001, CE
• Heavy Duty Enclosed Slewing Drives
• Anti-collision system
• Overload protection system with dual visual and audible alarms

 

 

• Remote control/cabin/ operation lever
• Overload protection systems: MOPS, AOPS
• Lifting of personnel – man-riding
• Hooks, beams, baskets, grabs, buckets and other boom tip attachments
• Electric hydraulic power units
• Active Heave Compensation (AHC)
• Marine surface treatment
• Quality management system certification and multi-classification society certificates
• Constant tensioning

 

 

 

 

 

 

Model	Load Capacity (T*m)	Max. Boom Length (m)	Pedestal Height (mm)	Pedestal Dia. (mm)	Lifting Min. Retracted	Lifting Max. Fully Extend	Est. Power (kw)
EJKC-2T12m	2T x 8m	12	1500	762	2T x 4m	2T x 12m	16.0
EJKC-5T15m	5T x 8m	15	1500	1420	5T x 5m	5T x 15m	22.0
EJKC-5T23m	5T x 15m	23	1600	2159	5T x 8m	5T x 23m	22.0
EJKC-10T14m	10T x 15m	14	1600	1620	10T x 5m	10T x 14m	32.0
EJKC-10T25m	10T x 25m	25	2000	2080	10T x 9m	10T x 25m	50.0
EJKC-15T13m	15T x 25m	13	1800	1820	15T x 5m	15T x 13m	50.0
EJKC-15T32m	15T x 32m	32	2000	2250	15T x 11m	15T x 32m	75.0
EJKC-20T12m	20T x 20m	12	1800	1820	20T x 4m	20 T x 12m	75.0
EJKC-20T24m	20T x 30m	24	2000	2250	20T x 8m	20T x 24m	75.0
EJKC-25T20m	25T x 30m	30	2000	2050	25T x 7m	25T x 20m	90.0

Note: 1. Larger load capacity crane not listed herein can be offered on request; 2. Explosion-proof requirements in the inquiry.

 

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