QDY Model Double Girders Overhead Metallurgy Crane

QDY Model Double Girder Overhead Metallurgical Crane

The QDY Model Double Girder Overhead Metallurgical Crane is a heavy-duty overhead crane specially designed for metallurgical applications, such as steel mills and foundries. It is equipped with a winch trolley and hook lifting device, capable of handling high temperatures, heavy loads, and continuous operation under harsh working conditions.

This crane strictly complies with GB/T metallurgical crane standards, and can be customized according to FEM, ISO, and CE requirements.

 

Main Features

1. Heavy-Duty Double Girder Structure

Welded box-type double girders with high rigidity

Designed for large tonnage and high duty class (A7–A8)

Low deflection and excellent stability during lifting

2. Specialized Metallurgical Hoisting Mechanism

Heavy-duty winch trolley with multi-layer wire rope drum

High-temperature resistant motors and brakes

Forged steel hook with safety latch

Suitable for lifting hot metal accessories (not molten steel unless specified)

3. High Reliability in Harsh Environments

Designed for high temperature, dust, and vibration

Electrical components protected with heat insulation

Special lubrication systems for metallurgical conditions

4. Smooth & Precise Operation

Stable lifting and traveling performance

Optional variable frequency drive (VFD) for speed control

Reduced impact load during start and stop

5. Advanced Safety Protection

Overload limiter

Upper and lower lifting limit switches

Emergency stop system

Redundant braking system (metallurgical requirement)

Anti-derailment and buffer devices

6. Operator-Oriented Control Options

Enclosed operator cabin with heat insulation

Pendant control or wireless remote control (optional)

Centralized control console for high safety and efficiency

 

Typical Technical Parameters

Lifting Capacity: 10–250 tons (customizable)

Span: 10.5–31.5 m or customized

Lifting Height: 10–30 m or customized

Working Duty: A7 / A8

Control Mode: Cabin / Pendant / Remote

The QDY Model Double Girder Overhead Metallurgical Crane is a heavy-duty overhead crane specially designed for metallurgical and high-temperature working environments. It is equipped with a winch trolley and hook lifting device and is designed for high working duty (A7–A8).

 

1. Double Box Main Girders

Welded box-type double girders made of high-strength steel

High rigidity, excellent load-bearing capacity

Designed with proper camber to reduce deflection

Rails mounted on top of girders for trolley operation

Heat-resistant and reinforced design for metallurgical use

2. End Carriages (Crane Traveling Mechanism)

Box-type end beams connecting the two main girders

Equipped with:

Forged or cast-steel crane wheels

Heavy-duty travel motors

Gear reducers

Dual braking system (metallurgical requirement)

Provide smooth and reliable longitudinal crane travel

3. Metallurgical Winch Trolley

A specially designed heavy-duty trolley for metallurgical conditions.

Includes:

Trolley frame with reinforced structure

Hoisting motor (high-temperature resistant)

Gear reducer with sealed lubrication

Multi-layer wire rope drum

Trolley traveling motor and reducer

Dual brake system for lifting safety

4. Hoisting Mechanism

Heavy-duty electric winch hoist

High-strength steel wire rope (heat-resistant type)

Forged steel hook with safety latch

Hook block and pulley system

Overload limiter

Upper and lower lifting limit switches

5. Electrical Control System

Main electrical control cabinet

High-temperature resistant electrical components

Optional PLC and VFD speed control system

Wiring protected by heat-resistant conduits

 

6. Power Supply System

Conductor bar (busbar) system

Cable festoon system (optional)

Main isolating switch

Grounding and lightning protection system

7. Control Devices

Operator cabin (standard for metallurgical cranes)

Pendant push-button control

Wireless remote control (optional)

 

8. Safety Protection Devices

Overload protection system

Upper and lower lifting limit switches

Travel limit switches for crane and trolley

Emergency stop system

Dual braking system (mandatory)

Buffer stops and rail sweepers

Anti-derailment devices

 

9. Operator Cabin

Fully enclosed, heat-insulated steel cabin

Ergonomic control console

Safety glass and lighting

Air-conditioning and heating system

Emergency escape system

10. Auxiliary Components

Walkways and maintenance platforms

Handrails and ladders

Lighting and alarm system

Heat shields and protective covers

Summary of Main Components

✔ Double Box Main Girders
✔ End Carriages
✔ Metallurgical Winch Trolley
✔ Hoisting Mechanism
✔ Electrical Control System
✔ Power Supply System
✔ Control Devices
✔ Safety Protection Devices
✔ Operator Cabin

Sketch

Main technical

 

 

Advantages of QDY Model Double Girder Overhead Metallurgical Crane

1. Designed for Metallurgical Duty (A7–A8)

Specially engineered for continuous, high-frequency operation

Meets metallurgical crane standards and safety requirements

Suitable for extreme working conditions

2. High Load Capacity & Structural Strength

Double box girder structure provides excellent rigidity

Capable of lifting large tonnage loads (20–250 tons or more)

Low deflection ensures safe and stable lifting

3. High Temperature Resistance

Heat-resistant motors, brakes, cables, and electrical components

Protective shields and insulation against radiant heat

Suitable for steel mill and foundry environments

4. High Safety & Redundant Protection

Dual braking system on hoisting mechanism (mandatory for metallurgy)

Overload limiter and lifting height limit switches

Emergency stop and anti-derailment devices

Reliable operation even during power fluctuations

5. Stable & Precise Operation

Winch trolley ensures smooth lifting and lowering

Optional VFD speed control reduces impact loads

Improves positioning accuracy and operational efficiency

6. Long Service Life

Reinforced structure and heavy-duty components

Wear-resistant materials and sealed gearboxes

Reduced maintenance frequency and downtime

7. Flexible Control Options

Enclosed operator cabin with heat insulation

Pendant control or wireless remote control (optional)

Centralized control improves safety and productivity

 

Applications of QDY Model Double Girder Overhead Metallurgical Crane

The QDY metallurgical crane is widely used in heavy industrial and metallurgical sectors.

1. Steel Mills

Handling steel slabs, billets, and blooms

Maintenance of steelmaking and rolling equipment

Transporting heavy metallurgical components

2. Foundries

Lifting molds, castings, and heavy tooling

Handling hot materials and high-temperature equipment

3. Metallurgical Workshops

Assembly and maintenance of furnaces and ladle accessories

Continuous lifting operations under harsh conditions

4. Power & Energy Industry

Handling turbines, generators, and heavy components

Maintenance operations in thermal power plants

5. Heavy Machinery Manufacturing

Lifting large machine tools and structural components

Assembly of heavy industrial equipment

6. Mining & Raw Material Processing Plants

Handling heavy processing equipment

Maintenance of crushers, mills, and conveyors

 

The QDY Model Double Girder Overhead Metallurgical Crane is manufactured according to metallurgical crane standards, designed for high temperature, heavy load, and high working duty (A7–A8). The entire production process follows GB/T, FEM, ISO, and CE requirements to ensure maximum safety and reliability.

1. Engineering Design & Metallurgical Classification

Confirm lifting capacity, span, lifting height, and duty class (A7/A8)

Metallurgical working condition analysis (heat, dust, continuous operation)

Structural calculation and FEM analysis

Selection of metallurgical-grade motors, brakes, wire ropes, and electrical components

Safety redundancy design (dual brakes, dual limit protection)

2. Raw Material Selection & Inspection

High-strength steel plates (Q235B / Q345B or equivalent)

Verification of steel certificates and mechanical properties

Ultrasonic testing for internal defects

Shot blasting for surface cleaning and stress reduction

3. CNC Cutting & Plate Preparation

CNC flame or plasma cutting of:

Girder plates

Flange plates

Web plates

Stiffeners and diaphragms

Edge beveling for full-penetration welding

Dimensional inspection and part identification

4. Double Box Girder Fabrication

4.1 Girder Assembly

Assembly of box girders with internal diaphragms

Precision fixtures ensure correct camber and alignment

4.2 Automatic Welding

Submerged arc welding for longitudinal seams

CO₂ gas-shielded welding for secondary welds

4.3 Stress Relief & Straightening

Heat or vibration stress relief treatment

Mechanical straightening to control deformation

4.4 Non-Destructive Testing

Ultrasonic Testing (UT)

Magnetic Particle Testing (MT)

Visual inspection of all weld seams

5. End Carriage & Traveling Mechanism Manufacturing

Welding of heavy-duty box-type end beams

CNC machining of wheel seats and bearing holes

Installation of:

Forged crane wheels

Travel motors

Gear reducers

Dual braking systems (mandatory for metallurgy)

Wheel alignment and running accuracy checks

6. Metallurgical Winch Trolley Assembly

Fabrication of reinforced trolley frame

Installation of:

High-temperature resistant hoisting motor

Heavy-duty reducer

Multi-layer wire rope drum

Metallurgical-grade steel wire rope

Forged hook block with safety latch

Installation of dual hoisting brakes

Assembly of trolley traveling mechanism

7. Electrical System Manufacturing

Assembly of main electrical control cabinet

Installation of heat-resistant electrical components

Optional PLC and VFD systems

Wiring protected with heat-resistant conduits

Installation of:

Overload limiter

Upper and lower lifting limit switches

Emergency stop system

8. Surface Treatment & High-Temperature Painting

8.1 Shot Blasting

Steel structures blasted to Sa2.5 standard

8.2 Painting System

Heat-resistant epoxy zinc-rich primer

Epoxy intermediate coating

High-temperature resistant polyurethane topcoat

9. Crane Assembly & Pre-Commissioning

Assembly of main girders and end carriages

Installation of winch trolley on bridge rails

Installation of power supply system (busbar or festoon cable)

Electrical wiring and functional checks

10. Factory Acceptance Testing (FAT)

Testing Includes:

No-load operation test

Static load test (125% rated load)

Dynamic load test (110% rated load)

Brake performance and emergency stop tests

Verification of safety and metallurgical protection devices

11. Packing & Transportation

Electrical components packed in sealed wooden crates

Winch trolley secured with steel supports

Structural components protected with moisture-proof materials

Suitable for container or bulk shipment

12. On-Site Installation & Commissioning

Installation on runway beams

Electrical connection and grounding

On-site load testing and performance verification

Operator training and safety instruction

13. Final Inspection & Acceptance

Performance inspection and approval

Delivery of test reports, certificates, and manuals

Warranty and after-sales service support

Workshop view:

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.