Marine cantilever crane

Marine Cantilever Crane Product Introduction

Product Overview

The marine cantilever crane is a specialized lifting equipment designed for onboard operations, featuring a cantilever structure that extends horizontally to complete lifting, handling, and transferring tasks. It is compact, space-saving, and highly adaptable to the limited deck space of ships, making it an essential auxiliary equipment for various vessels. Engineered to withstand harsh marine environments—including salt spray, humidity, ship heeling, and strong winds—this crane complies with international marine standards (CCS, BV, LR, DNV) and ISO 9001:2015 certification. Driven by hydraulic, electric, or electro-hydraulic systems, it provides stable, efficient, and safe lifting services for small to medium-sized cargo, spare parts, and equipment, widely used on bulk carriers, container ships, fishing boats, offshore platforms, and workboats to support daily ship operations and maintenance.

Classification & Applications

Classification

By Drive Mode: Hydraulic marine cantilever crane (most common for marine use), electric marine cantilever crane, electro-hydraulic marine cantilever crane, and manual marine cantilever crane (for light-load scenarios).

By Installation Type: Fixed marine cantilever crane (mounted on ship decks or cabins), foldable marine cantilever crane (foldable when not in use to save space), and telescopic marine cantilever crane (adjustable cantilever length for flexible operation).

By Lifting Capacity: Light-duty (0.5t–3t), medium-duty (3t–10t), designed to meet the handling needs of small to medium-sized onboard cargo and equipment.

By Environmental Adaptability: Standard marine type, marine anti-corrosion type (enhanced coating for salt spray resistance), and explosion-proof type (for flammable and explosive cabins or offshore platforms).

Applications

Onboard Daily Operations: Lifting and transferring spare parts, tools, daily necessities, food supplies, and small equipment for crew daily use and routine ship maintenance.

Cargo Auxiliary Handling: Assisting in loading and unloading small bulk cargo, light containers, and irregular goods on ships, complementing large marine cranes and improving handling efficiency.

Ship Maintenance: Lifting and moving small mechanical components, pipelines, and maintenance tools during deck, cabin, and engine room maintenance, reducing crew labor intensity.

Offshore & Special Vessels: Lifting sundries, rescue equipment, and fishing gear on offshore platforms, workboats, and fishing vessels; also used for auxiliary lifting of life rafts and emergency equipment.

Inland River Ships: Adapting to small and medium-sized inland river vessels, handling construction materials, daily supplies, and small cargo, supporting inland waterway logistics.

Working Principle

The marine cantilever crane operates through the coordinated work of a power system, transmission mechanism, lifting mechanism, and control system, specifically optimized for marine working conditions:

Power Supply: Electric models are powered by the ship’s 3-phase AC power (380V/440V), while hydraulic models rely on an electric motor driving a hydraulic pump to generate high-pressure oil flow; manual models rely on manual operation for light-load lifting.

Lifting Movement: The power system drives the hoisting winch (equipped with high-strength steel wire ropes and hooks) to wind or unwind, realizing vertical lifting and lowering of loads. The lifting speed is adjustable to ensure stable handling of fragile or small items.

Cantilever Adjustment: Foldable/telescopic models adjust the cantilever length or angle through hydraulic cylinders or manual mechanisms, expanding the working range while saving space when retracted. Fixed models have a fixed cantilever angle for stable operation.

Slewing Function: Most models are equipped with a slewing mechanism that drives the cantilever to rotate 180°–360°, enabling omnidirectional lifting operations on the ship deck.

Safety Control: The integrated control system is equipped with overload protection, upper and lower limit switches, anti-sway devices, and emergency stop buttons. It adapts to ship heeling (≤5°) and trimming (≤2°) conditions, automatically cutting off power or stopping operation in abnormal situations to ensure the safety of personnel, equipment, and cargo at sea.

Performance Advantages

Marine-Grade Corrosion Resistance: Adopts high-strength carbon steel or stainless steel structure with anti-corrosion coating (epoxy zinc-rich primer + topcoat) and sealed electrical components, effectively resisting salt spray, humidity, and marine atmospheric corrosion, ensuring long service life in harsh marine environments.

Compact & Space-Saving Design: The cantilever can be folded or retracted when not in use, occupying minimal deck space—critical for small and medium-sized ships with limited deck area. The overall structure is lightweight yet sturdy, suitable for installation in narrow areas (such as bow, stern, or cabin sides).

Flexible & Precise Operation: Supports 180°–360° slewing and adjustable cantilever length/angle, enabling precise positioning of cargo in limited spaces. Available with wired pendant control, wireless remote control, or local control, easy to operate even in narrow or hard-to-reach areas.

High Safety & Reliability: Complies with international marine safety standards and ship classification society certifications (CCS, BV, LR, DNV), equipped with complete safety protection devices. Stable operation, low failure rate, and adaptable to ship heeling and trimming during navigation, ensuring safe operation at sea.

Multi-Purpose Adaptability: Compatible with hooks, small grabs, and spreader beams, capable of handling different types of small cargo, sundries, and spare parts, meeting diverse auxiliary lifting needs onboard ships.

Easy Installation & Maintenance: Modular design, simple installation process, and fewer wearing parts. Daily maintenance only requires regular lubrication and inspection, reducing maintenance costs and downtime, ensuring continuous operation at sea.

Energy-Saving & Low Noise: Electric and electro-hydraulic models feature high energy conversion efficiency, low energy consumption, and low operating noise (below 70 decibels), ensuring a comfortable working environment for the crew.