double-girder semi-gantry crane

Authentication mark:

This crane is mainly used in workshop loading bays, outdoor storage yards adjacent to buildings, and railway maintenance depots.

Capacity:

5 Ton, 10 Ton, 16t, 20t, Other

Lifting Height:

20 m

Span:

18~35m

Voltage/Hertz:

3 Phase 380V 50hz/Customized

Working Class:

A3~A6

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Introduction

Application Scenario

Advantages

Structural Diagram And Parameter Table

INTRODUCTION

The BMG type double-girder semi-gantry crane features two main girders, one leg running on a ground rail, and the opposite side supported by a building-mounted runway or wall rail. This design combines the high rigidity and heavy lifting capacity of a double-girder crane with the space-saving advantage of a semi-gantry configuration. Lifting capacity typically ranges from 5t to 50t, with spans up to 35m and duty class A5‑A7. It is ideal for workshops, stockyards, and loading bays where one side has limited floor space but heavy-duty performance is required.

APPLICATION SCENARIO

[1] Workshop Loading Bays – Handling heavy machinery, dies, or steel plates near bay doors with one side wall-mounted.

[2] Outdoor Storage Yards – Stacking and retrieving heavy materials (coils, pipes, concrete products) along building perimeters.

[3] Container Loading Areas – Lifting heavy cargo from trucks or containers with the wall-supported side saving floor space.

[4] Railway Maintenance Depots – Servicing locomotive components or heavy spare parts where building rails exist.

[5] Recycling Facilities – Moving heavy scrap bins or bales along a building edge.

ADVANTAGES

[1] High Load Capacity – Double-girder structure supports heavy loads from 5t up to 50t.

[2] Space-Saving Design – Eliminates one gantry leg, freeing up valuable floor space on one side.

[3] Rigid and Stable – Dual girders provide excellent stability and smooth load travel.

[4] Cost-Effective – Uses existing building structure for support, reducing steel and installation costs.

[5] High Duty Cycle – Designed for continuous operation with duty class up to A7.

STRUCTURAL DIAGRAM AND PARAMETER TABLE

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.