OVERHEAD CRANE

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Explosion-proof Double-girder Bridge Crane

QB Type Explosion-proof Hook Bridge Crane

QD Double Girder Overhead Crane

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This crane is mainly used in heavy machinery workshops, steel melting shops, equipment assembly plants, industrial manufacturing facilities, and warehouse logistics centers.

Capacity:

5 t – 500 t (customizable)

Lifting Height:

6 m – 30 m (customizable based on building clearance)

Span:

10.5 m – 31.5 m customizable

Voltage/Hertz:

3 Phase 380V 50hz

Working Class:

A5, A6, A7, A8 (Medium to extra heavy duty)

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Introduction

Application Scenario

Advantages

Structural Diagram And Parameter Table

INTRODUCTION

The QD Double Girder Overhead Crane is a heavy-duty bridge crane designed with a double box-girder bridge structure and an independent open winch trolley (winch hoisting mechanism). Designed primarily for hook-based material handling, the winch trolley travels horizontally on top of the main girders, while the entire bridge moves longitudinally along elevated runway beams.

APPLICATION SCENARIO

1. Steel Mills & Foundries
The primary application for QD cranes. Used for handling steel coils, slabs, ladles, and molten metal with C-hooks, coil grabs, or special ladle attachments. The double girder design handles off-center loading and high point loads typical of steel coil handling, making it essential for cold rolling mills and continuous casting processes.-12 -22

2. Manufacturing & Machining Workshops
Serves as core lifting equipment for mechanical processing and assembly workshops, metal structure fabrication, and machinery maintenance facilities. Lifts raw materials, semi-finished products, and finished goods in fixed-span operations.-12

3. Power Plants & Hydropower Stations
Used for installation, maintenance, and overhaul of turbines, generators, and heavy power equipment. The high lifting capacity and precise control are critical for plant maintenance operations.

ADVANTAGES

1. Superior Structural Rigidity
The double girder construction distributes load weight evenly across the entire span, significantly reducing stress and deflection. This ensures stable, safe operation under heavy-duty cycles and off-center loading conditions typical of C-hooks and coil grabs.-21

2. Enhanced Lifting Height
The trolley and hoist are mounted on top of the girders rather than between them, maximizing hook approach and providing greater lifting height compared to single girder models. This optimizes vertical workspace utilization.-21

3. Superior Hook Approach & Space Utilization
With end trucks located at the very ends of the girders, the crane operates close to building walls, maximizing floor space and eliminating dead zones in the facility.

STRUCTURAL DIAGRAM AND PARAMETER TABLE

Parameter	Specification
Working Class	A5, A6, A7, A8
Capacity	5 t – 500 t
Span	10.5 m – 31.5 m
Lifting Height	6 m – 30 m
Lifting Speed	Main hook: 4 – 12 m/min Auxiliary hook: 6 – 15 m/min
Trolley Travelling Speed	35 – 45 m/min (VVVF optional for precise positioning)
Crane Travelling Speed	20 – 50 m/min
Control Method	Cabin control / Remote radio control / Pendant control
Power Supply	380V / 50Hz / 3-phase
Temperature	-20°C to +50°C
Protection Grade	Motor: IP54 – IP55, Insulation class F or H
Girder Type	Double girder – Two box-section main beams with full-penetration welding
Trolley Type	Electric wire rope trolley with main and auxiliary hooks

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