Marine Knuckle Boom Crane

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Marine Knuckle Boom Crane

Application

A marine knuckle boom crane is a type of crane that is specifically designed and constructed for use on marine vessels such as ships, barges, and offshore platforms. It is equipped with a knuckle boom, which consists of two or more articulated sections that can be extended and retracted to reach varying distances and heights. This type of crane is commonly used in marine construction and engineering projects, as well as in offshore oil and gas exploration and production.
The knuckle boom design offers several advantages over traditional straight boom cranes, including greater flexibility in positioning and reaching loads, as well as increased safety and stability. Marine knuckle boom cranes are typically operated by hydraulic systems, and can be configured with a variety of attachments and accessories, including hooks, grabs, and winches, to suit different applications and requirements.

For more marine knuckle boom cranes specifications, please click here.

Advantages and Features

1. Contract structure, high strength;

2. Saving space, multi-function;

3. Easy for maintenance, lubrication and inspection.

4. Corrosion resistance, long lifespan.

5. Can be designed and manufacture to suit customers applications and special operating requirements.

6. Local control or remote control.

7. General motor or explosion-proof motor.

8. Automatic & manual overload protection system.

9. 360° continuous rotation with limits available

10. Certificate: ABS, BV, LR...

Knuckle Boom Marine Crane Structure

We not only provide customers with high-quality products, but also provide complete system solutions and high value-added services for specific customers. Therefore, it has strong competitiveness.

Configuration

Part Name	Type/Material	Advantages/Disadvantages
Slewing Bearing	42CrMo	It has high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and multiple impact resistance after quenching and tempering treatment, and good low-temperature impact toughness.
	50Mn	The wear resistance, strength, elasticity and hardness are all high, and they are mostly used after quenching and tempering, and the welding performance is poor. Generally used to manufacture parts with high wear resistance and high stress.
	S45C	Cold plasticity in general, annealing and normalizing are slightly better than quenching and tempering; annealing and normalizing are slightly better than quenching and tempering; they have higher strength and better machinability; Toughness, plasticity and wear resistance.
Hoisting Winch	A32 & E36	Medium weldability, cold deformation, medium plasticity, good machinability; corrosion resistance.
	Q345-B	High strength and good welding performance.
Hydraulic Motor Type	DONGFANG and XINHONG brand	Good quality, cost-effective, long service life. With brake, high safety.
	Other brands	High power consumption, relatively poor quality.
Other Parts	Q345-B	Higher strength and better weldability.
	A32 & E36	Medium weldability, cold deformation, medium plasticity, good machinability; corrosion resistance.

Due to the fierce market competition, the phenomenon of low quality of other winch suppliers is frequent. What is the difference between us and other low-quality suppliers?

The specific differences are as follows:

Part name	Other low quality suppliers	Result	Our factory	Consequence
Slewing Bearing	S45C	Toughness, plasticity and wear resistance are poor, cold plasticity is average	42CrMo	It has high strength and toughness, and good hardenability; after quenching and tempering treatment, it has high fatigue limit and multiple impact resistance, and has good low-temperature impact toughness.
Hoisting Winch	ZG270-500	Casting defects cannot be avoided	A32 & E36	Medium weldability, cold deformation, medium plasticity, good machinability; corrosion resistance.
			Q345-B	High strength and good welding performance.
Hydraulic Motor Type	Other brands	High power consumption, relatively poor quality.	DONGFANG or XINGHONG brand	Cost-effective, good quality. With brake, high safety.
Other Parts	Q235-B	The use of products with small load has low strength, which is not conducive to the use of products with excessive load.	Q345-B	Higher strength and better weldability.
			A32 & E36	Medium weldability, cold deformation, medium plasticity, good machinability; corrosion resistance.

Drawing of Marine Knuckle Boom Crane

Main Specification

Safety Load	Max Outreach	Lifting Speed	Slewing Speed	Luffing Time	Hoisting Height	Slewing Angle
kN	m	m/min	m/min	s	m	゜
10	6-20	15	1	60	30	360゜
15	8-22	15	1	60	30	360゜
20	5-24	15	1	60	30	360゜
30	8-25	15	0.9	70	30	360゜
50	12-25	15	0.75	80	30	360゜
80	12-25	15	0.75	100	40	360゜
Above specifications only for reference, We can supply various marine cranes according to your requirements.

Marine Knuckle Boom Crane in Factory

Images of Marine Knuckle Boom Crane

How to repair and maintain the marine knuckle boom crane? 

Proper maintenance and repair of a marine knuckle boom crane is important to ensure safe and reliable operation. Here are some general guidelines for maintenance and repair of these cranes:

1) Regular inspections: Regular visual inspections of the crane should be carried out to check for any signs of damage, wear, or other issues. Inspections should be carried out before and after each use, as well as at regular intervals specified by the manufacturer.

2) Lubrication: The crane's moving parts, such as the articulating boom sections and the lifting mechanism, should be regularly lubricated according to the manufacturer's instructions.

3) Cleaning: The crane should be kept clean to prevent the buildup of debris and other contaminants. This can help to prevent corrosion and other types of damage.

4) Replace worn or damaged parts: Any worn or damaged parts should be promptly replaced to prevent further damage or safety issues. Replacement parts should be sourced from the crane's manufacturer or an authorized supplier to ensure compatibility and safety.

5) Repair hydraulic leaks: Any hydraulic leaks should be promptly repaired to prevent damage to the hydraulic system and to ensure safe and reliable operation of the crane.

6) Test safety features: The crane's safety features, such as limit switches, overload protection, and emergency stop buttons, should be regularly tested to ensure they are working properly.

7) Conduct regular maintenance: In addition to regular inspections, the crane should be subject to regular maintenance, such as hydraulic system checks, electrical system checks, and load testing, as specified by the manufacturer.

It is important to follow the manufacturer's guidelines for maintenance and repair to ensure safe and reliable operation of the marine knuckle boom crane. It is also recommended to work with experienced professionals for any repairs or maintenance activities to ensure they are carried out properly and safely.