1. Main Girder

The main girder is the primary load-bearing structure of the crane. It supports the hoist and carries the lifted load across the workshop.

Features

Welded box-type steel construction

High strength and rigidity

Optimized lightweight design

Anti-deformation structure

Function

Supports the electric hoist

Transfers lifting loads to end carriages

Ensures stable crane operation

3. End Carriages

The end carriages are mounted on both sides of the main girder and allow the crane to travel along runway rails.

Components

Wheel sets

Traveling motors

Reducers

Bearings

Buffers

Functions

Support crane movement

Maintain traveling stability

Reduce vibration during operation

5. Electrical Control System

The electrical system controls all crane motions and safety functions.

Main Components

Electrical control cabinet

Contactors

Inverters (optional)

Circuit breakers

Relays

Limit switches

Functions

Controls lifting and traveling motions

Protects against overload and short circuits

Provides safe operation

 

 

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4. Trolley Mechanism

The trolley moves the hoist horizontally along the main girder.

Components

Trolley frame

Travel motor

Wheels

Drive shaft

Transmission system

6. Hoist Traveling Mechanism

The hoist trolley moves horizontally along the bottom flange of the main girder.

Components

Trolley frame

Travel motor

Wheels

Gear transmission system

Function

Enables precise lateral load positioning

 

7. Hook Block Assembly

The hook block directly carries the load during lifting operations.

Includes

Forged hook

Pulley block

Bearings

Safety latch

Features

High load capacity

Wear resistance

Safe load handling

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8. Wire Rope System

The wire rope transmits lifting force from the hoist drum to the hook block.

Characteristics

High tensile strength

Anti-twist design

Long service life

 

9. Safety Protection Devices

Common Safety Components

Overload limiter

Emergency stop switch

Upper/lower limit switches

Phase sequence protection

Voltage protection

Rail buffers

Anti-collision device (optional)

Purpose

Improve operational safety

Prevent equipment damage

Reduce accident risks

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10. Control Devices

Pendant Control

Wired push-button station for ground operation.

Wireless Remote Control

Provides flexible and safer long-distance operation.

Cabin Control (Optional)

Used for large-span or high-duty cranes.

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11. Power Supply System

Common Types

Festoon cable system

Conductor busbar system

Function

Provides stable electrical power to the crane and hoist.

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12. Rail & Runway System

The runway structure supports crane movement throughout the workshop.

Components

Crane rails

Rail clamps

Support beams

Runway columns

Features

High structural strength

Smooth crane travel

Long operational lifespan

 

Sketch

 

Main technical

 

Advantages of 20 Ton Single Girder Overhead Crane

1. High Lifting Efficiency

The crane provides fast and stable material handling for medium and heavy-duty industrial applications. It significantly improves production efficiency and reduces manual labor intensity.

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2. Compact Structure

The single girder design has a simpler and lighter structure compared with double girder cranes.

Benefits

Reduced overall crane weight

Lower wheel pressure

Smaller installation space requirement

Easier workshop integration

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3. Cost-Effective Solution

A 20 ton single girder overhead crane offers an economical lifting solution for many factories and workshops.

Cost Advantages

Lower manufacturing cost

Reduced transportation expenses

Lower installation cost

Reduced maintenance expenses

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4. Smooth and Stable Operation

Advanced motor control systems and precision components ensure stable crane performance.

Features

Smooth starting and braking

Reduced load swing

Low vibration

Accurate positioning

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5. Easy Installation

The modular design simplifies transportation and on-site assembly.

Advantages

Faster installation process

Reduced downtime

Lower labor requirements

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6. Low Maintenance Requirements

The crane uses durable components with reliable mechanical and electrical systems.

Benefits

Long service life

Fewer breakdowns

Reduced maintenance frequency

Lower spare parts consumption

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7. High Safety Performance

Equipped with multiple safety protection devices to ensure safe operation.

Safety Features

Overload protection

Emergency stop system

Limit switches

Phase protection

Short-circuit protection

Buffers and anti-collision devices

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8. Energy Saving

Modern cranes can be equipped with frequency inverter technology for efficient power consumption.

Energy Benefits

Reduced electricity usage

Lower operational costs

Environmentally friendly operation

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9. Flexible Control Options

The crane can be operated using different control methods depending on application requirements.

Available Controls

Pendant control

Wireless remote control

Cabin control (optional)

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10. Wide Application Range

The crane is suitable for many industrial lifting environments.

Applicable Industries

Machinery manufacturing

Steel fabrication

Warehousing

Concrete production

Equipment maintenance

Logistics centers

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11. Customizable Design

The crane can be customized according to workshop conditions and lifting requirements.

Optional Configurations

Variable Frequency Drive (VFD)

Explosion-proof system

European FEM standard

Anti-sway system

Special lifting tools

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12. Improved Workplace Productivity

By automating material transportation, the crane helps streamline workflow and improve operational efficiency.

Productivity Improvements

Faster material movement

Reduced manpower

Improved workflow coordination

Increased production output

 

Applications of 20 Ton Single Girder Overhead Crane

The 20 Ton Single Girder Overhead Crane is widely used for lifting, transporting, loading, unloading, and positioning heavy materials in various industrial environments. Its compact structure, reliable performance, and economical operation make it suitable for medium-duty lifting applications.

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Main Application Industries

1. Machinery Manufacturing Plants

Used for handling mechanical parts, machine tools, steel components, and finished equipment during production and assembly processes.

Typical Tasks

Equipment assembly

Machine component transportation

Workshop material handling

Maintenance lifting operations

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2. Steel Structure Workshops

Suitable for lifting steel beams, plates, pipes, and fabricated steel structures.

Applications

Steel fabrication

Beam positioning

Structural welding assistance

Material transfer between workstations

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3. Warehouses and Logistics Centers

Used for efficient cargo movement and storage management.

Functions

Loading and unloading goods

Heavy cargo stacking

Container handling

Material transportation

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4. Precast Concrete Plants

Widely used in concrete production facilities for handling molds and concrete components.

Typical Lifting Objects

Concrete beams

Concrete panels

Steel molds

Reinforcement cages

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5. Equipment Maintenance Workshops

Provides safe lifting support during maintenance and repair work.

Maintenance Applications

Motor replacement

Heavy equipment disassembly

Component installation

Workshop repair operations

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6. Metal Fabrication Factories

Ideal for transporting raw materials and finished metal products.

Materials Handled

Steel plates

Metal coils

Pipes and tubes

Fabricated metal structures

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7. Mining Auxiliary Workshops

Used in mining equipment repair and spare part handling operations.

Common Uses

Lifting mining machinery parts

Maintenance support

Spare component transportation

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8. Power Plants and Energy Facilities

Assists in lifting turbines, motors, valves, and maintenance equipment.

Applications

Equipment installation

Maintenance lifting

Spare part handling

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9. Automotive Manufacturing Plants

Used in vehicle assembly and parts transportation processes.

Functions

Engine lifting

Chassis handling

Component positioning

Production line material transfer

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10. Paper Mills and Processing Plants

Suitable for handling rolls, machinery components, and maintenance equipment.

Common Tasks

Paper roll transportation

Machine repair support

Production material handling

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Operational Environments

The crane is suitable for:

Indoor workshops

Factory production lines

Storage facilities

Assembly plants

Maintenance stations

 

Detailed Production Procedure

1. Technical Design & Drawing Confirmation

Engineers prepare detailed crane drawings and technical specifications according to customer requirements.

Design Includes

Crane capacity

Span and lifting height

Working duty classification

Structural calculations

Electrical system layout

Safety device configuration

Objectives

Ensure structural safety

Optimize crane performance

Meet international standards

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2. Raw Material Procurement

Qualified raw materials and components are purchased from approved suppliers.

Main Materials

Steel plates

Structural steel

Motors

Gear reducers

Wire ropes

Electrical components

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3. Incoming Material Inspection

All materials undergo strict quality inspection before production.

Inspection Items

Material certificates

Steel thickness verification

Mechanical property testing

Surface defect inspection

Component specification checking

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4. Steel Plate Cutting

Steel plates are cut according to production drawings using CNC cutting equipment.

Equipment Used

CNC flame cutting machine

Plasma cutting machine

Laser cutting machine

Advantages

High cutting precision

Smooth cutting edges

Reduced material waste

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5. Main Girder Assembly

The main girder structure is assembled using positioning fixtures.

Assembly Work

Web plate positioning

Flange plate assembly

Reinforcement installation

Dimensional alignment

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6. Automatic Welding

The girder is welded using automatic submerged arc welding technology.

Welding Features

Deep penetration welding

Stable weld quality

High production efficiency

Reduced welding deformation

Quality Control

Weld seam inspection

Ultrasonic flaw detection

Visual inspection

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7. Girder Straightening & Camber Adjustment

After welding, the girder is corrected to meet technical tolerance requirements.

Adjustment Includes

Camber correction

Side bending correction

Twist adjustment

Purpose

Ensure smooth crane travel

Improve structural stability

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8. End Carriage Fabrication

End carriages are manufactured and assembled separately.

Main Processes

Steel cutting

Welding

Wheel installation

Bearing assembly

Reducer installation

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9. Machining Process

Precision machining is performed on critical components.

Machined Parts

Wheel sets

Bearing seats

Shaft connections

Couplings

Equipment

CNC lathes

Milling machines

Drilling machines

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10. Shot Blasting & Surface Treatment

Steel structures are cleaned before painting.

Purpose

Remove rust and welding slag

Improve paint adhesion

Increase corrosion resistance

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11. Primer Painting

Anti-rust primer is applied to protect steel surfaces.

Painting Features

Corrosion protection

Uniform coating thickness

Improved durability

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12. Electric Hoist Assembly

The electric wire rope hoist is assembled and tested.

Assembly Includes

Motor installation

Drum assembly

Wire rope installation

Brake adjustment

Hook block installation

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13. Mechanical Component Assembly

Mechanical transmission systems are installed.

Components

Motors

Reducers

Wheels

Couplings

Brakes

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14. Electrical System Installation

Electrical control systems and safety devices are installed.

Electrical Components

Control cabinet

Inverters

Limit switches

Festoon cable system

Emergency stop devices

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15. Complete Crane Assembly

All crane components are integrated into a complete system.

Assembly Includes

Girder and end carriage connection

Hoist installation

Electrical wiring

Mechanical adjustment

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16. Electrical Wiring & Testing

Electrical systems are tested before load testing.

Tests Include

Insulation resistance testing

Motor rotation testing

Control function testing

Safety circuit inspection

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Performance Testing Procedure

17. No-Load Testing

The crane operates without load to verify motion functions.

Test Items

Hoist operation

Crane traveling

Trolley movement

Brake performance

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18. Static Load Testing

The crane is tested with rated load and overload conditions.

Purpose

Verify structural strength

Check deflection performance

Confirm safety reliability

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19. Dynamic Load Testing

Dynamic operation is tested under working conditions.

Test Includes

Lifting performance

Traveling stability

Brake effectiveness

Noise and vibration inspection

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20. Quality Inspection

Final inspection ensures compliance with standards and customer specifications.

Inspection Standards

Welding quality

Dimensional accuracy

Electrical safety

Mechanical performance

Paint quality

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21. Final Painting & Marking

Finish paint and product labels are applied.

Surface Finish

Anti-corrosion coating

Industrial-grade paint

Customer color customization

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22. Packaging & Delivery

The crane is prepared for transportation and export shipment.

Packaging Includes

Protective wrapping

Wooden box packing for electrical parts

Component labeling

Shipping documentation

 

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%.