What are the main engineering advantages of a Four Link Portal Crane over a Single Jib Crane?

For high-duty cycle ports and shipyards, the four-bar linkage mechanism delivers three major performance leaps: Near-Perfect Horizontal Luffing Path: As the jib luffs (changes working radius), the articulated linkage forces the load to move along a straight horizontal trajectory. This prevents extra lifting height loss and dramatically speeds up handling cycle times. Superior Energy Efficiency: The dynamic counterweight system compensates for the dead weight of the jib linkage during luffing, reducing the required luffing motor power by up to 30% to 40% compared to rigid single-jib designs. Smoother High-Speed Operation: Minimal load swaying during simultaneous slewing and luffing ensures high positioning accuracy for container alignment and grab discharging.

Can a Four Link Portal Crane handle both bulk cargo (grab) and heavy general cargo/containers?

Yes, modern four-bar linkage portal cranes are built as versatile Multi-Purpose Dockside Cranes: Quick-Change Riggings: Equipped with dual-drum or four-drum hoisting winches, allowing smooth transitions between mechanical/hydraulic grab buckets (for coal, grain, ore) and modular hooks or semi-automatic container spreaders. VFD Anti-Sway Control: Integrated Variable Frequency Drive (VFD) PLC systems automatically adjust motor torque during multi-motion combination (hoisting + slewing + luffing), maintaining load stability regardless of cargo type.

How does the portal frame (gantry structure) accommodate port rail and logistics traffic?

The lower portal frame is custom-engineered around your terminal's specific quay infrastructure:Tailored Rail Span & Clearance: The portal width (rail span typically ranging from 10.5m to 20m and portal height are designed to allow train tracks, truck lanes, or AGVs to pass directly beneath the crane without interrupting quay traffic.Flexible Power Supply Options: Can be powered via cable reel systems (cable drum), conductor lines (trench busbar), or diesel-electric hybrid generators for non-electrified wharves.

What storm-protection safety systems are built-in to prevent crane runaway during coastal typhoons?

Coastal port machines face extreme gale-force winds up to storm survival standards (e.g., > 55 m winds):Multi-Tiered Rail Clamping: Features automatic hydraulic rail clamps and wheel brakes that trigger immediately if wind speeds exceed preset safety limits or power cuts out.Mechanical Anchoring & Pinning: Heavy-duty storm anchoring pins and tie-down turnbuckles mechanically lock the portal structure to the quay wall foundation during non-operational storm warnings.Anemometer Interlocking: Real-time digital wind speed sensors automatically feed data into the main PLC console to alert operators and lock hazardous motions early.

Four Link Portal Crane

High-Capacity Four Link Portal Crane with Robust Design

Four Link Gantry Crane for Efficient Material Handling

Customizable Four Link Overhead Crane for Warehouses

Four Link Portal Crane with Advanced Load Balancing Technology

Durable Four Link Gantry Crane for Shipyards and Ports

Four-linkage portal crane for shipyard and logistics applications

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Capacity:5~200t (customizable)

Lifting Height:20m (customizable)

Voltage/Hertz:(customizable)

Brand Name: YUNTIAN

Place of Origin: Henan, China

Product manual

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Introduction

Technical Data (General Version)

Application

Features

PRODUCT INTRODUCTION

The Four Link Portal Crane is a mobile, full-revolving harbor crane featuring a balanced four-bar combined jib system. Its main steel structures include the jib, A-frame, slewing platform, and gantry frame—available in cylinder or four-outrigger configurations. The crane integrates hoisting, luffing, slewing, and travel mechanisms, and supports multiple spreader types including grab, container spreader, hook, and electromagnetic disc.Designed for long-reach operations and larger vessels, this crane delivers reliable, durable performance with easy maintenance. It is an optimal solution for comprehensive, multi-cargo port operations.Applicable Standards: GB17495, GB6067, GB3811, ISO, FEM, JIS.

TECHNICAL DATA

APPLICATION

Construction and Heavy Industries

Dockyard Applications

Metallurgy Industry

Waste Management and Recycling

Port Operations

FEATURES

Four-Mechanism Coordination: Equipped with hoisting, luffing, slewing, and traveling mechanisms that can operate independently or in coordination, significantly improving handling efficiency

Level Luffing Technology: The core advantage lies in the four-bar jib system, which ensures the hook follows a near-horizontal trajectory during luffing, resulting in stable load movement and low energy consumption.

Quick Spreader Change: Features a standard quick-change interface, allowing seamless switching between hook, grab, and container spreader within 3-5 minutes, adapting to various cargo types

Wide Operating Range: The jib can rotate 360°, covering the entire quayside area. Its design accommodates various ship sizes and handles bulk, general, and containerized cargo

Automation & Intelligence: Can be equipped with a CMS intelligent monitoring system for real-time status tracking, alongside automated features like grab auto-cycle, anti-sway control, and jib anti-collision systems.

Energy-Efficient & Eco-Friendly: Utilizes AC frequency control for smooth starts and energy savings. An optional active inverter technology can feed braking energy back into the power grid.

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