Double-girder bucket gantry crane

Authentication mark:

This crane is mainly used in port bulk terminals, power plant coal yards, and mining aggregate stockpiles.

Capacity:

5 t – 50 t

Lifting Height:

6 m – 20 m (above rail + below rail optional for pit operation)

Span:

18 m – 50 m (customizable for stockyards & bulk terminals)

Voltage/Hertz:

3 Phase 380V 50hz

Working Class:

A6, A7, A8 (Heavy to very heavy duty for continuous bulk handling)

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Introduction

Application Scenario

Advantages

Structural Diagram And Parameter Table

INTRODUCTION

What is this?

The double-girder bucket gantry crane is a double girder gantry crane equipped with a grab bucket as the lifting attachment. Through the opening, closing, and lifting of the grab bucket, combined with trolley and crane traveling, it achieves large-capacity grabbing, transferring, and loading/unloading of bulk materials such as coal, ore, sand, gravel, fertilizer, and grain. If you are managing a port terminal, coal yard of a thermal power plant, building materials stockyard, or bulk cargo stockyard, and need to efficiently handle large volumes of bulk materials, this product is designed for you.

Why choose a double-girder bucket gantry crane over a single-girder bucket gantry crane?

Compared to single-girder bucket gantry cranes, the double-girder bucket solution offers four core advantages:

First, stronger load capacity – the double main beam structure provides lifting capacity from 5 tons to 50 tons, with grab bucket capacity from 0.5m³ to 6m³, meeting large-volume bulk material handling requirements.

Second, higher operational efficiency – equipped with electric grab or four-rope grab, fast grabbing speed and large single-grab volume significantly improve loading/unloading efficiency.

Third, smoother operation – higher structural rigidity of the double girders results in less deflection over long spans, providing more stable grab operation and more precise positioning.

Fourth, adapts to harsh environments – motors with IP55 protection rating, dustproof and moisture-proof, suitable for high-dust, rain, and snow conditions in outdoor stockyards.

Tackle heavier bulk material handling with stronger equipment.

What can we do for you?

We understand that every customer has different materials and different stockyard conditions. Therefore, we offer flexible customization options: lifting capacity from 5 tons to 50 tons; grab bucket capacity from 0.5m³ to 6m³; grab types of electric grab or four-rope grab; leg types of A-frame, L-frame, or U-frame; control options of cabin or remote radio. Whether your material is coal, ore, sand, gravel, or grain, we can match the most suitable grab bucket capacity and structural design.

Unsure? Don't know?

Not sure whether to choose an electric grab or a four-rope grab? Don't know what grab bucket capacity can handle your workload? No problem. Just tell us: your material type and bulk density, your hourly handling capacity requirement, and your stockyard span. Our engineers will provide you with an accurate quote and CAD drawings within 24 hours. Click the button below or contact us via WhatsApp/email to get your customized solution.

💡 Tip: We offer free selection consulting. Even if you are unsure about specific parameters, feel free to describe your material types and operational needs, and we will calculate for you.

APPLICATION SCENARIO

[1] Port Bulk Terminals – Loading/unloading coal, iron ore, grain, and sand from ships or trucks.

[2] Power Plant Coal Yards – Grabbing and feeding coal to conveyors or storage piles.

[3] Mining and Aggregate Stockpiles – Handling crushed stone, gravel, and mineral concentrates.

[4] Steel Plant Raw Material Yards – Bucketing iron ore, coke, and limestone. [5] Grain Storage Facilities – Loading and stacking grain in large outdoor silos.

ADVANTAGES

[1] High Grab Efficiency – Automatic bucket opening/closing provides fast cycle times for bulk materials.

[2] Double-Girder Stability – Rigid structure ensures smooth travel even with heavy, unbalanced bucket loads.

[3] Large Working Area – Gantry design covers wide stockpiles without fixed overhead runways.

[4] Durable Bucket Options – Wear‑resistant materials for abrasive ores; stainless steel for corrosive bulk. [5] Weather Resistant – Built for outdoor use with corrosion protection and sealed components.

STRUCTURAL DIAGRAM AND PARAMETER TABLE

Parameter	Specification
Working Class	A6, A7, A8
Capacity	5 t – 50 t
Span	18 m – 50 m
Lifting Height	6 m – 20 m
Lifting Speed	8 – 20 m/min
Trolley Travelling Speed	30 – 45 m/min
Crane Travelling Speed	20 – 40 m/min
Control Method	Cabin control (grab-specific joysticks) / Remote radio control
Power Supply	380V / 50Hz / 3-phase
Temperature	-20°C to +50°C
Protection Grade	Motors: IP55 (dust-proof & water-jet proof), Insulation class F or H Electrical cabin: dust-protected design
Girder Type	Double-girder (box section with grab mechanism reinforcement)

Six core advantages

Full Scenario Coverage

Nucleon covers over 20 product categories including ladle cranes, multi-purpose cranes, intelligent cranes, overhead/portal cranes, RTG, RMG, deck cranes, portal cranes, girder launchers, yacht cranes, KBK, and jib cranes. From steel smelting to port handling, bridge construction to ship equipment, Nucleon provides one-stop lifting solutions. Whether standard models or extreme-condition customizations, Nucleon possesses mature technical expertise and proven track records, saving customers from dealing with multiple suppliers.

Military-Grade Quality Standards

We use high-strength steel from Baosteel/Ansteel for key structural components, with 100% NDT inspection and one-clamp CNC gantry machining. Every machine undergoes 120% dynamic load and 125% static load tests before delivery, with continuous operation verification under extreme conditions. Even in 24/7 continuous casting plants, -40°C arctic ports, or high-temperature humid ship cabins, our cranes maintain millimeter-level precision and zero-drift stability—quality that stands the test of time.

Extended Longevity & Low Maintenance Cost

Our main girders are FEA-optimized and double-submerged arc welded, with a design life of ≥30 years. Key bearings are lifetime lubrication-free, and hardened travel wheels extend wear cycles by 3 times. Core components feature modular quick-change interfaces with spare parts commonality exceeding 80%. Annual maintenance costs are reduced by 40%~60%, saving millions in lifecycle operating expenses — truly "invest once, benefit long-term."

Energy Efficiency Leader

Our entire series comes standard with IE5 permanent magnet synchronous motors + energy feedback VFD drives, achieving 25%~35% comprehensive energy savings. Single-motor operation under light loads and adaptive speed control reduce electrical waste by over 30%. High-strength steel lightweight design cuts deadweight by 15%~20%, lowering workshop load requirements. A single ladle crane station saves over RMB 150,000 in electricity costs annually, helping customers achieve green and low-carbon production.

Ultimate Safety Redundancy Design

Our hoisting mechanism comes standard with dual brakes + mechanical overspeed switch + triple limit switches, featuring multiple redundant interlocks to prevent load dropping and over-traveling. Large products use box girder torsion-resistant structures, remaining stable even in level 8 gusty winds. Optional intelligent safety monitoring systems detect anomalies in load, skew, wind speed, etc., with automatic alarms and shutdowns. Overall safety redundancy coefficient > 2.0, maintaining zero crane safety incidents for many consecutive years.

Deep Customization & Full Lifecycle Service

We provide complete front-end support from site survey and mechanical simulation to civil review, delivering custom drawings within 2 weeks, with non-standard lead times only 5~7 days longer than standard products. We establish lifelong digital dossiers for customers, warning of end-of-life components 3 months in advance. Our full lifecycle services cover installation training, regular inspections, and remote O&M. With customer repeat purchase rates exceeding 85% for five consecutive years, we are a trustworthy long-term partner.