OVERHEAD CRANE

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Single-Girder Bridge Grab 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] Heavy Machinery Workshops – Handling large machine parts, engine blocks, press frames, castings, and heavy industrial equipment.

[2] Steel Melting Shops – Lifting and transporting molten metal ladles, scrap charging buckets, and slag pots with heat-resistant components and safety redundancy.

[3] Equipment Assembly Plants – Moving transformer bodies, generator rotors, turbine sections, wind turbine components, and mining equipment parts.

[4] Steel Service Centers – Loading/unloading steel coils, plates, pipes, H-beams, and structural sections from trucks and storage racks.

[5] Industrial Manufacturing Facilities – Handling large molds, dies, heavy castings, and finished heavy products in general manufacturing. [6] Warehouse Logistics Centers – Lifting and moving heavy pallets, large equipment, and oversized cargo in high-bay warehouses.

ADVANTAGES

[1] High Load Capacity – Double girder design supports loads from 5t up to 500t, meeting heavy industrial requirements.

[2] Long Span Capability – Rigid double girder structure easily achieves spans over 30m, covering wide workshop areas.

[3] Maximum Lifting Height – Top-running trolley design provides higher effective lifting height than single girder cranes.

[4] High Duty Cycle – Designed for continuous operation with duty class up to A8, suitable for intensive 24/7 use.

[5] Smooth and Precise – VVVF frequency control provides smooth start/stop and accurate load positioning. [6] Versatile Configuration – Compatible with main/auxiliary hooks, magnets, grabs, ladles, and spreaders.

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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