What is the main difference between a Single Jib Portal Crane and a Four-Bar Linkage Portal Crane?

Both are widely used harbour slewing cranes, but they differ in structural complexity and application scenarios: Single Jib Portal Crane: Features a single rigid boom design. It has fewer mechanical parts, lighter deadweight, lower initial purchase cost, and easier maintenance. It is ideal for mid-to-small ports, inland river terminals, and shipyard repair berths. Four-Bar Linkage Portal Crane: Uses a articulated four-bar linkage mechanism to keep the load completely level during luffing. It offers higher operational speeds for high-intensity, continuous sea port container/bulk handling, but comes with a higher investment cost.

How does the Single Jib Portal Crane maintain load stability during the luffing (boom raising/lowering) process?

On a single jib portal crane, horizontal load movement during luffing is achieved through a specialized rope compensation system (block and tackle compensation): As the jib angle changes, the wire rope reeving system automatically pays out or takes up cable. This compensates for the height change of the boom tip, keeping the hook/grab moving along a nearly horizontal trajectory, which significantly reduces load swing and power consumption.

Can a single jib portal crane be equipped for both bulk cargo (grab) and general cargo (hook) operations?

Yes, Yuntian single jib portal cranes are designed as multi-purpose wharf cranes. They feature a quick-change system that allows smooth transition between different lifting attachments: Hook Operation: For steel coils, bagged cargo, machinery, and container handling. Grab Operation: Compatible with electro-hydraulic or four-rope mechanical grabs for bulk materials like coal, iron ore, grain, and sand. VFD Dual Drives: Equipped with independent hoisting and grab-opening winches for smooth bulk handling.

How is the portal frame (gantry base) customized to allow road and rail traffic underneath?

The lower portal frame of our single boom portal crane is custom-engineered to match your quay infrastructure: Clearance Height & Track Gauge: Designed with ample clearance (3.5m to 7m+) to allow multi-lane truck traffic, railway tracks, or belt conveyors to pass directly under the crane. Rail Wheel Load Distribution: Options for 4, 8, or 12-wheel bogies to distribute wheel loads evenly and protect aging wharf structures from excessive ground stress.

Single Jib Portal Crane

Portal Gantry Boat Crane for shipyards, docks, and marine applications

High-quality Floating Luffing Dock Jib Portal Crane for harbor operations

Mobile Single Jib Portal Crane with robust construction for port logistics

Best-in-class Portal Gantry Crane for offshore and marine lifting solutions

Authentication mark:

Capacity:10~200t (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

Port crane to facilitate multiple cranes to work side by side on the same ship, the gantry crane with rotating column connected to the vertical column, or the rolling bearing type bearing slewing device connected to the gantry through the large bearing, is generally used to reduce the tail diameter of the rotating part, and the gantry structure is used to reduce the pier cover surface (the projection of the gantry main body to the ground). In the process of development, gantry crane is also gradually popularized and applied to the shipyard and hydro power station construction site with similar operating conditions to the port.

TECHNICAL DATA

Attribute	Specification Range
Rated Lifting Capacity	10~200t (customizable)
Lifting Height	20m (customizable)
Span	10~40m (customizable)
Work Duty Class	A4, A5, A6, A7
Rail Gauge × Base	10.5m × 10.5m
Hoisting Speed	25 - 60 m/min
Traveling Speed	15 - 27 m/min
Tail Swing Radius	7 - 9 m
Power Supply	customizable

APPLICATION

Seaports & River Ports

Multi-Purpose Terminals

Shipyards & Ship Repair Facilities

FEATURES

Versatile Load Handling: Seamlessly manages a wide array of cargo—from bulk materials like coal and grain to containers and general machinery—by quickly swapping between hooks, grabs, and specialized spreaders.

Extensive Operational Outreach: The single jib design provides a significant working radius, enabling the crane to reach across wide vessels or cover expansive quay areas without frequent repositioning.

Optimized Yard Traffic Flow: Its high-clearance portal structure allows trucks and railway wagons to pass directly through its base, ensuring that heavy-duty lifting doesn't bottleneck ground-level transportation.

Precise Slewing and Positioning: Engineered with high-fidelity slewing and luffing mechanisms, it offers the fine-tuned control necessary for the accurate placement of cargo in tight storage spots or ship holds.

Robust Structural Stability: Built with a high-rigidity portal frame, it maintains stable, high-frequency performance in demanding outdoor environments, ensuring safety and uptime even in high-wind coastal conditions.

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