Gantry Crane 20 Ton

 

Why Choose a 20-Ton Gantry Crane?

✔ Heavy Lifting – Handles up to 20 tons with ease.
✔ Adaptable – Works indoors/outdoors, fixed or mobile.
✔ Safe & Reliable – Built-in safety mechanisms.
✔ Cost-Effective – Reduces manual labor and speeds up operations.

 

A 20-ton gantry crane is ideal for industries needing medium to heavy lifting with flexibility in movement.

Single girder: Best for cost-effective, light-duty use.

Double girder: Preferred for heavy-duty, high-precision tasks.

 

Key Specifications for a 20-Ton Gantry Crane

Parameter	Single Girder	Double Girder
Capacity	20T	20T (upgradable)
Span	5m–25m	10m–35m+
Lifting Height	6m–18m	8m–30m+
Hoist Type	Electric / Wire Rope	Top-Running Winch
Control	Pendant / Remote	Cabin / Remote
Duty Class	A3–A5	A5–A7 (heavy-duty)

 

Warranty :1 Year

Weight (KG):35000 kg

Feature:Gantry Crane

Application:Railway Station/Sea Port/Yard/Subway

Rated Lifting Moment:Different

Material: Q235/Q345

Working Temperature:-40~40 ℃

Legs space:Bigger than normal

Control:Cabin control

Electrical parts:Schneider

Power Source:380~480V, 50hz/60hz

Power supply:M5~M8 (ISO)

Main electrical parts:Schneider Brand

Crane feature:High Efficiency

A 20-ton gantry crane consists of structural, mechanical, electrical, and safety components that work together for efficient lifting operations. Below is a detailed breakdown of its key parts:

 

1. Structural Components

A. Bridge Girders

Single Girder (for lighter duty):

One main box-section beam (typically European standard (EN) or DIN-grade steel).

Double Girder (for heavy-duty):

Two parallel girders for higher stability (used in steel plants, ports).

B. Legs (End Carriages)

Fixed or Adjustable Legs: Supports the bridge and moves along the runway rails.

Wheel Assemblies: Equipped with steel wheels or polyurethane wheels for smooth travel.

C. Cross Beams & Bracing

Provides lateral stability to prevent swaying during lifting.

 

2. Lifting & Motion Mechanisms

A. Hoisting Unit

Electric Hoist (for single girder):

Wire rope hoist (e.g., 20T CD/MD type) or chain hoist.

Trolley Winch (for double girder):

Top-running trolley with a 20T wire rope winch (higher precision).

 

B. Trolley & Crab Unit

Trolley Frame: Moves along the girder(s) to position the load.

Drive Motors & Gearboxes: Powers trolley movement (variable speed options available).

C. Travel Mechanism (Long Travel)

Wheels & Rail System:

Steel wheels run on P24/P38 crane rails or steel tracks.

Drive Motors: Typically 2 or 4 motors for synchronized movement.

Buffers & Rail Clamps: Prevent collisions and secure the crane when parked.

3. Electrical & Control Systems

A. Power Supply

Festoon System (for power delivery along the girder).

Cable Reel (for long-travel power supply).

B. Control Panel & Operator Interface

Pendant Control (wired, IP65 rated for durability).

Radio Remote Control (wireless, up to 100m range).

Operator Cabin (for double girder cranes, with joystick controls).

C. Variable Frequency Drive (VFD) (Optional)

Ensures smooth acceleration/deceleration for precise load handling.

4. Safety Components

A. Load Limiting & Overload Protection

Load Cell / Weighing System (prevents lifting beyond 20T).

Torque Limiter (protects the motor from overloading).

B. Limit Switches

Hoisting Limit Switch (prevents over-hoisting).

Trolley & Gantry Travel Limits (prevents over-travel).

.

C. Emergency Stop & Anti-Collision

E-Stop Buttons (at multiple access points).

Laser/Anti-Collision Sensors (for multi-crane operations).

D. Wind-Resistant Features (Outdoor Use)

Anemometer (auto-stops crane in high winds).

Rail Clamps / Brakes (secures crane during storms).

5. Auxiliary Components

A. Walkways & Maintenance Platforms

Allows safe access for inspections and repairs.

B. Lighting & Warning Systems

Beacon Lights & Alarms (for hazard warnings).

C. Lubrication System

Automatic greasing for wheels, gears, and bearings.

SKETCH

Main technical

 

High Load Capacity

Specifically designed for heavy-duty lifting up to 20 tons, making it ideal for industrial and construction applications.

Versatility

Available in both single girder (cost-effective) and double girder (heavy-duty) configurations to suit different needs.

Mobility & Flexibility

Can be rail-mounted (fixed path) or rubber-tired (mobile), allowing use in various environments like workshops, yards, and ports.

Sturdy Construction

Built with high-grade steel (Q235B/Q345B) for durability, capable of withstanding harsh conditions (outdoor use, foundries, etc.).

Precision & Control

Equipped with variable frequency drives (VFDs) for smooth operation and pendant/remote controls for precise load handling.

Safety Features

Includes overload protection, limit switches, emergency brakes, and anti-sway systems to ensure safe operations.

Low Maintenance

Robust components (sealed bearings, galvanized wires) reduce wear and extend service life.

Customizable Attachments

Can be fitted with magnets, grabs, or spreader beams for specialized tasks (scrap handling, container lifting, etc.).

 

1. Manufacturing & Warehousing

Moving heavy machinery, steel coils, and large equipment.

Loading/unloading goods in large warehouses.

2. Construction & Infrastructure

Lifting precast concrete beams, pipes, and structural steel.

Assisting in bridge and high-rise building construction.

3. Ports & Logistics

Handling 20-ft and 40-ft shipping containers (with spreader attachments).

Loading bulk cargo (coal, grain) using grab buckets.

4. Steel & Metal Industry

Transporting molten metal ladles (with safety interlocks).

Moving steel plates, coils, and rolls in mills.

5. Railway & Shipyards

Maintenance of locomotives and railcars.

Assembling ship sections and heavy engine parts.

6. Energy & Power Plants

Installing turbines, generators, and transformers.

Handling heavy components in nuclear/hydroelectric plants.

7. Scrap & Recycling Yards

Equipped with electromagnetic lifts or grapples for scrap metal processing.

 

 

1. Design and Planning

Demand Analysis: According to customer needs and usage scenarios, a detailed demand analysis is carried out to determine the specifications, load, span, lifting height, etc. of the crane.

Engineering Design: Engineers use CAD and other design software to carry out detailed design, including structural, mechanical, electrical and other aspects to ensure that the design meets relevant standards and specifications.

2. Material Procurement

Material Selection: Select appropriate steel, motors, control systems and other components according to design requirements.

Supplier Screening: Screen suppliers of materials and components to ensure the quality and reliability of materials.

3. Processing and Manufacturing

Cutting and Forming: Cut, weld, bend and other processes on steel to form main beams, end beams and other structural components.

Machining: Precision machining of key components, such as turning, milling, drilling, etc., to ensure that the size and accuracy meet the design requirements.

Surface Treatment: Spray, galvanize or rust-proof metal parts to enhance corrosion resistance and aesthetics.

4. Assembly

Component Assembly: Assemble the main beam, end beam, trolley, lifting mechanism and other components to form a complete crane structure.

Installation of electrical system: Install electrical equipment such as motors, control cabinets, sensors, limit switches, etc. to ensure the normal operation of the electrical system.

5. Debugging and testing

Preliminary debugging: Carry out preliminary debugging of the crane to check the coordination and operation of each component.

Load test: Carry out load test to ensure the safety and stability of the crane under rated load, and test the functions of safety devices such as overload protection and limit switches.

Performance test: Test the performance indicators of the crane such as lifting speed, running speed, braking effect, etc. to ensure that they meet the design requirements.

6. Quality inspection

Quality inspection: Carry out a comprehensive quality inspection of the crane, including appearance, size, performance, etc., to ensure compliance with relevant standards.

Safety assessment: Carry out safety assessment to ensure the normal operation of all safety devices and systems.

7. Delivery and installation

Packaging and transportation: Pack qualified cranes and prepare them for transportation to the customer site.

On-site installation: Carry out on-site installation according to customer requirements, including basic production and equipment debugging.

Training and handover: Train operators to ensure that they master the operation methods and safety precautions of the equipment and complete the handover work.

 

 

 

 

 

 

 

Material Inspection

Quality Inspection: Strict quality inspection is carried out on the purchased raw materials to ensure that they meet the design requirements and national standards.

Material Storage: Qualified materials are stored according to classification to prevent corrosion or damage.

Cutting and Forming

Steel Cutting: Use plasma cutting, laser cutting or flame cutting and other technologies to cut the steel according to the size of the design drawing.

Forming Processing: Form the steel plate through bending, rolling, welding and other processes to manufacture the main beam, end beam and other structural parts.

Welding

Component Welding: The cut and formed steel parts are welded into the main structures such as the main beam, end beam and trolley. The welding process needs to be strictly controlled to ensure the structural strength and welding quality.

Weld Inspection: Use non-destructive testing technology (such as ultrasonic testing, radiographic testing) to inspect the welds to ensure that there are no cracks or other defects.

Machining

Precision Machining: Precision machining is performed on the key components of the crane, such as wheel sets, bearing seats, pulleys, etc., to ensure their dimensional accuracy and surface quality.

Assembly of the whole machine

General assembly: On the basis of pre-assembly, the overall assembly of the crane is carried out, including the final installation of the main beam, end beam, lifting mechanism, walking mechanism, etc.

Commissioning and testing

Under dynamic conditions, the operating performance of the crane is tested, including the testing of lifting, walking, steering and other functions. The overall size of the assembled bridge crane is checked to ensure that all dimensions meet the design requirements.

Spraying and anti-corrosion treatment

Surface treatment Rust removal: Rust removal on the surface of the crane, common methods include sandblasting, pickling, etc. Primer spraying: Spray anti-corrosion primer on the treated surface to prevent metal oxidation and corrosion. Topcoat spraying Color spraying: Spray topcoat according to customer requirements or industry standards to give the crane a protective and decorative effect. Marking: After spraying, mark the crane's identification information in accordance with the specifications, such as model, rated load, etc.

Factory and installation

Packaging and transportation

Packaging protection: Protectively package the key components of the crane to prevent damage during transportation. Transportation arrangement: According to the equipment size and transportation conditions, select a suitable transportation method to transport the crane to the customer's site.

Acceptance and delivery

Customer acceptance

On-site acceptance: The customer conducts on-site acceptance of the crane according to the contract requirements and technical specifications to check the performance and quality of the equipment.

Problem rectification: If any problems are found, the manufacturer needs to rectify them in time to ensure that the equipment fully meets the customer's requirements. Delivery and use Operation training: The manufacturer usually trains the customer's operators to ensure that they can operate the crane correctly and safely.

Hot Tags: gantry crane 20 ton, China gantry crane 20 ton manufacturers, suppliers, factory, Single Girder Overhead Travelling Crane, Double Girder Bridge Crane with Electric Hoist, Rolling Mill Overhead Crane, Electromagnetic Overhead Crane with Rotary Carrier Beam, Grab Overhead Crane, Double Girder Overhead Crane