1. Main Girder

The main girder is the primary load-bearing structure of the crane. It supports the hoist and transfers the load to the end carriages.

Features

Box-type welded steel structure

High rigidity and strength

Optimized lightweight design

Anti-deflection construction

The end carriages are installed at both ends of the main girder and allow the crane to travel along runway rails.

Main Parts

Wheels

Axles

Bearings

Drive motors

Gear reducers

Buffers

3. Electric Wire Rope Hoist

The electric wire rope hoist is the core lifting mechanism responsible for raising and lowering materials.

Main Components

Lifting motor

Gear reducer

Drum

Steel wire rope

Hook block

Brake system

Pulley system

 

 

---

4. Trolley Mechanism

The trolley moves the hoist horizontally along the main girder.

Components

Trolley frame

Travel motor

Wheels

Drive shaft

Transmission system

5. Crane Traveling Mechanism

This mechanism drives the entire crane bridge along the runway rails.

Components

Traveling motors

Gearboxes

Drive wheels

Couplings

Brake assemblies

 

6. Hook Block Assembly

The hook block directly carries the load during lifting operations.

Components

Forged hook

Pulley block

Safety latch

Bearings

.

7. Electrical Control System

 

The electrical system controls all crane motions and safety protections.

Main Components

Electrical control cabinet

Inverters (VFD)

Contactors

Circuit breakers

PLC controller

Power supply system

 

8. Control Devices

The crane can be operated through different control methods.

Types

Pendant push-button control

Wireless remote control

Cabin control (optional)

 

9. Safety Protection Devices

Safety systems protect operators, equipment, and materials during operation.

Main Safety Devices

Overload limiter

Emergency stop switch

Limit switches

Rail clamps

Buffers

Phase protection relay

Short-circuit protection

 

 

10. Power Supply System

The power supply system delivers electricity to moving crane components.

Types

Festoon cable system

Busbar conductor system

Cable reels

 

11. Runway Rail System

The runway rail system supports crane traveling across the workshop.

Components

Rails

Rail clips

Fish plates

Supporting beams

 

12. Steel Structure Platform (Optional)

Some cranes include maintenance platforms and walkways.

Functions

Maintenance access

Safer inspection work

Easier servicing

 

 

Sketch

 

Main technical

 

A 12 ton single girder overhead crane offers an efficient, economical, and reliable lifting solution for workshops, warehouses, and manufacturing facilities. Compared with traditional lifting equipment, it provides better space utilization, improved working efficiency, and lower operating costs.

---

1. Compact and Lightweight Structure

The single girder design uses less steel material and has a lighter overall weight than a double girder crane.

Benefits

Reduced wheel pressure

Lower load on workshop structure

Easier installation

Reduced transportation cost

Result

Ideal for existing workshops with limited structural capacity.

---

2. Cost-Effective Solution

Single girder cranes require fewer materials and simpler manufacturing processes.

Cost Advantages

Lower manufacturing cost

Reduced installation expense

Lower maintenance cost

Reduced energy consumption

Result

Provides high lifting efficiency with economical investment.

---

3. Space Saving Design

The crane operates above the workshop floor, maximizing usable workspace.

Features

Overhead material transportation

Low headroom hoist option

Compact bridge structure

Benefits

More floor space for production

Better workshop organization

Improved material flow

---

4. Smooth and Stable Operation

Advanced drive systems ensure stable crane motion during lifting and traveling.

Features

Frequency conversion control (VFD)

Soft start and soft stop

Low vibration operation

Accurate positioning

Benefits

Protects lifted materials

Reduces mechanical wear

Improves operational precision

---

5. High Working Efficiency

The crane enables fast and continuous material handling across the workshop.

Advantages

Faster loading and unloading

Reduced manual labor

Continuous production support

Improved workflow efficiency

Result

Increases overall workshop productivity.

---

6. Easy Installation and Maintenance

The simplified structure makes installation and servicing more convenient.

Features

Modular component design

Easy electrical connection

Accessible maintenance points

Benefits

Shorter installation time

Reduced downtime

Lower maintenance labor cost

---

7. Enhanced Safety Performance

The crane includes multiple safety protection systems for safe operation.

Safety Devices

Overload limiter

Emergency stop switch

Travel limit switches

Phase protection

Buffer devices

Braking systems

Benefits

Reduces accident risk

Protects operators and equipment

Improves operational reliability

---

8. Energy Efficient Operation

Modern single girder cranes are designed for low energy consumption.

Energy Saving Features

Lightweight steel structure

High-efficiency motors

Frequency inverter control

Reduced friction losses

Result

Lower electricity consumption and operating costs.

---

9. Flexible Customization

The crane can be customized according to workshop requirements.

Optional Configurations

Remote control operation

Explosion-proof design

Anti-corrosion coating

Low headroom hoist

Intelligent monitoring system

Benefits

Suitable for different industrial environments and applications.

---

10. Wide Application Range

 

The crane is widely used in:

Manufacturing workshops

Warehouses

Steel fabrication plants

Machinery assembly shops

Maintenance workshops

Logistics centers

Result

Provides versatile lifting solutions for many industries.

 

A 12 ton single girder overhead crane is widely used for medium-duty lifting and material handling operations in industrial facilities. Its compact structure, efficient operation, and economical cost make it suitable for various workshop and warehouse applications.

 

1. Manufacturing Workshops

Single girder overhead cranes are commonly installed in manufacturing plants for handling raw materials, machine parts, and finished products.

Typical Applications

Machinery assembly

Component transportation

Mold handling

Equipment installation

Production line material transfer

Benefits

Improves production efficiency

Reduces manual labor

Enhances workflow organization

---

2. Warehouses and Logistics Centers

The crane is widely used in warehouses for loading, unloading, and internal transportation of goods.

Typical Applications

Cargo movement

Pallet lifting

Heavy goods storage handling

Truck loading and unloading

Benefits

Faster logistics operations

Improved storage management

Reduced forklift traffic

---

3. Steel Fabrication Plants

Steel processing workshops use overhead cranes for handling heavy steel materials.

Typical Applications

Steel plate lifting

Pipe transportation

Structural steel handling

Welding workshop material transfer

Benefits

Safe heavy material handling

Increased fabrication efficiency

Reduced material damage

---

4. Mechanical Assembly Workshops

The crane assists in assembling heavy machinery and industrial equipment.

Typical Applications

Motor installation

Gearbox assembly

Machine positioning

Equipment maintenance

Benefits

Precise component positioning

Reduced assembly time

Improved worker safety

---

5. Maintenance and Repair Workshops

Single girder cranes are widely used for maintenance operations in industrial service workshops.

Typical Applications

Equipment disassembly

Spare part replacement

Pump and motor lifting

Maintenance support

Benefits

Easier equipment servicing

Reduced downtime

Safer maintenance operations

---

6. Power Plants and Utility Facilities

The crane is suitable for handling equipment and maintenance components in utility facilities.

Typical Applications

Turbine maintenance

Generator component lifting

Pump handling

Pipe installation

Benefits

Reliable equipment handling

Improved maintenance efficiency

Stable lifting performance

---

7. Automotive Industry

Automotive factories use overhead cranes for moving components and assembly materials.

Typical Applications

Engine transportation

Mold handling

Vehicle component assembly

Production support lifting

Benefits

Faster assembly processes

Improved material flow

Reduced labor intensity

---

8. Construction Material Workshops

The crane is used for lifting and transporting construction materials.

Typical Applications

Concrete component handling

Metal structure transfer

Construction equipment maintenance

Benefits

Efficient heavy material movement

Reduced manual handling risk

Better workshop productivity

---

9. Mining and Heavy Equipment Workshops

Mining and heavy equipment service facilities use cranes for repairing and maintaining machinery.

Typical Applications

Mining equipment repair

Hydraulic component lifting

Heavy machinery assembly

Benefits

Reliable heavy-duty lifting

Improved repair efficiency

Safer workshop operation

---

10. General Industrial Material Handling

The crane supports daily lifting operations in many industrial environments.

Typical Applications

Raw material transportation

Finished product movement

Internal workshop logistics

Equipment relocation

Benefits

Continuous production support

Improved operational efficiency

Reduced labor costs

 

The production of a 12 ton single girder overhead crane involves multiple stages including design, material preparation, fabrication, machining, assembly, inspection, and testing. Strict quality control throughout the manufacturing process ensures the crane meets safety standards, lifting performance requirements, and long-term operational reliability.

---

1. Technical Design and Engineering

The production process begins with engineering design according to customer requirements and workshop conditions.

Main Design Tasks

Lifting capacity calculation

Span and lifting height design

Structural strength analysis

Wheel load calculation

Electrical system configuration

Safety protection design

Design Software

CAD modeling

Finite Element Analysis (FEA)

3D structural simulation

Output Documents

Fabrication drawings

Assembly drawings

Electrical schematics

Production process plans

---

2. Raw Material Procurement and Inspection

 

High-quality raw materials are selected to ensure structural safety and durability.

Main Materials

Q235B/Q355B steel plates

Structural steel sections

Forged hooks

Wire ropes

Motors and reducers

Electrical components

Inspection Procedures

Material certificate verification

Thickness inspection

Surface defect checking

Mechanical property testing

Chemical composition analysis

Purpose

Ensure all materials comply with design and industry standards.

3. Steel Plate Cutting

Steel plates are cut according to fabrication drawings.

Cutting Equipment

CNC plasma cutting machine

Flame cutting machine

Laser cutting machine

Main Operations

Web plate cutting

Flange plate cutting

Rib plate preparation

End beam component cutting

Quality Control

Dimensional accuracy inspection

Edge smoothness checking

Deformation control

---

4. Main Girder Fabrication

The main girder is the most critical structural component.

Fabrication Steps

Plate assembly

Positioning and tack welding

Automatic submerged arc welding

Stiffener installation

Rail welding

Girder alignment correction

Welding Methods

Submerged arc welding

CO₂ gas shielded welding

Manual welding for details

Inspection

Weld seam inspection

Ultrasonic testing (UT)

Magnetic particle testing (MT)

Deflection measurement

---

5. End Carriage Manufacturing

End carriages support the crane and enable travel along runway rails.

Production Steps

Steel structure fabrication

Wheel machining

Bearing installation

Drive assembly

Motor installation

Machining Equipment

CNC lathes

Milling machines

Drilling machines

Quality Checks

Wheel concentricity

Gear alignment

Bearing fitting accuracy

---

6. Hoist Assembly

The electric wire rope hoist is assembled and tested separately.

Main Assembly Parts

Lifting motor

Gear reducer

Drum

Wire rope

Hook block

Brake system

Assembly Procedures

Reducer installation

Drum alignment

Wire rope winding

Brake adjustment

Lubrication filling

Testing

No-load lifting test

Brake performance test

Noise and vibration inspection

---

7. Shot Blasting and Surface Treatment

Steel components undergo surface preparation before painting.

Procedures

Shot blasting cleaning

Rust removal

Surface roughening

Standard

Sa2.5 surface cleaning standard

Purpose

Improve paint adhesion and corrosion resistance.

8. Painting Process

Protective coatings improve durability and appearance.

Painting Layers

Anti-rust primer

Intermediate coating

Top finishing paint

Optional Coatings

Epoxy paint

Marine anti-corrosion coating

Heat-resistant coating

Inspection

Paint thickness measurement

Surface finish inspection

Adhesion testing

---

9. Electrical System Installation

Electrical systems are installed after structural fabrication.

Main Components

Control cabinet

Motors

Frequency inverters

Cables

Limit switches

Safety devices

Installation Work

Cable routing

Terminal wiring

Grounding

Electrical protection setup

Inspection

Insulation resistance test

Circuit continuity test

Control function verification

 

10. Complete Crane Assembly

All crane components are assembled into a complete system.

Assembly Procedures

Main girder connection

End carriage installation

Hoist mounting

Trolley installation

Electrical system integration

Alignment Work

Wheel alignment

Rail alignment

Hoist positioning

---

11. Quality Inspection and Testing

Comprehensive testing ensures safe crane operation.

Inspection Items

Structural dimension inspection

Welding quality inspection

Electrical system testing

Mechanical operation testing

Load Testing

No-Load Test

Checks crane movement and control operation.

Static Load Test

Usually conducted at 125% rated load.

Dynamic Load Test

Conducted at 110% rated load during crane motion.

Safety Verification

Brake performance

Limit switch operation

Emergency stop function

Overload protection

12. Packaging and Delivery

 

The crane is prepared for transportation after final approval.

Packaging Procedures

Component wrapping

Anti-rust protection

Wooden box packaging for electrical parts

Transportation securing

Delivery Documents

Quality certificates

Test reports

Installation manual

Operation manual

 

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%.