Overhead Gantry Crane

Types of Overhead Gantry Cranes:

Single Girder Gantry Crane – Uses one main beam; lighter-duty lifting (up to ~20 tons).

Double Girder Gantry Crane – Uses two beams for heavier loads (up to several hundred tons).

Adjustable/Portable Gantry Crane – Can be moved or resized for flexibility.

Semi-Gantry Crane – One side runs on a rail, while the other is supported by a building structure.

Rubber-Tired Gantry (RTG) Crane – Used in shipping yards, moves on rubber tires instead of rails.

Applications:

Manufacturing & Warehousing – Moving heavy materials.

Construction Sites – Lifting steel beams, concrete panels.

Shipping & Ports – Loading/unloading containers (RTG cranes).

Rail Yards – Handling heavy rail components.

Automotive Industry – Moving large vehicle parts.

Rated Loading Capacity：5 ton, 10 TON, 100 ton, customized, 16/3.2 ton, 20/5 ton, 32/5 ton, 50/10 ton

Max. Lifting Height：40m, customized

Span：35m or clients' demands

Warranty：1 Year

Weight (KG)：50000 kg

Core Components：PLC, Engine, Bearing, Gearbox, Motor, Pressure vessel, Gear, Pump

Control way：Cab, wireless remote control or customized

An overhead gantry crane consists of several key components that work together to lift, move, and position heavy loads safely. Below is a detailed breakdown of its main parts:
1. Gantry Frame (Support Structure)
Legs/Vertical Supports – Steel columns that hold up the bridge/girder.
Can be fixed-height or adjustable.
May have wheels or run on rails for mobility.
Cross Beams/End Carriages – Connect the legs and support the bridge movement.

2. Bridge/Girder (Main Horizontal Beam)
The primary load-bearing structure that spans the work area.
Single Girder – One beam (lighter loads, cost-effective).
Double Girder – Two beams (higher capacity, more stability).
 

3. Trolley & Hoist Assembly
Trolley – Moves along the bridge/girder, carrying the hoist.
Can be manual or motor-driven.
Hoist – The lifting mechanism (electric chain hoist or wire rope hoist).
Includes a hook, drum, motor, and braking system.

4. End Trucks/Wheels
Located at the ends of the gantry legs.
Equipped with wheels or casters for movement:
Rail-mounted – Runs on fixed tracks (for heavy-duty cranes).
Rubber-tired – Mobile without rails (e.g., RTG cranes in ports).

5. Runway System (For Rail-Mounted Gantry Cranes)
Rails/Tracks – Guide the crane's movement.
Rail Clamps – Lock the crane in place when needed.

6. Drive Mechanism (For Motorized Cranes)
Travel Motors – Power the movement of the crane along the runway.
Gearboxes & Brakes – Control speed and stopping.

7. Control System
Pendant Control – Handheld wired remote.
Radio Remote Control – Wireless operation.
Cabin Control – Operator sits in a cabin (for large cranes).

8. Safety Components
Limit Switches – Prevent over-travel.
Overload Protection – Prevents lifting beyond capacity.
Anti-Collision Sensors – Used in multi-crane setups.
Emergency Stop (E-Stop) – Instantly cuts power.

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9. Electrical & Power Supply
Festoon System/Cable Reel – Manages power cables.
Busbar System – For heavy-duty electric cranes.

10. Optional Accessories
Spreaders – For handling containers (in port cranes).
Magnet or Vacuum Lifters – For steel sheets or fragile loads.
Weighing System – Measures load weight during lifting.

SKETCH

Overhead gantry cranes are essential material-handling equipment used across industries for lifting and moving heavy loads. They offer flexibility, strength, and efficiency, making them superior to other crane types in many applications.

Key Advantages of Overhead Gantry Cranes
1. High Load Capacity & Stability
Can lift from 1 ton to 500+ tons, depending on design.
Double-girder gantry cranes provide extra stability for heavy-duty lifting.
2. No Building Modifications Needed
Unlike bridge cranes, gantry cranes are self-supporting (do not rely on building structures).
Ideal for outdoor use (ports, construction sites) or temporary setups.
3. Mobility & Flexibility
Can be fixed, adjustable, or portable (rubber-tired gantry cranes).
Can cover large spans (up to 30m+ for industrial applications).
4. Precise Load Handling
Smooth trolley & hoist movement allows accurate positioning.
Variable speed controls for delicate or high-speed operations.
5. Cost-Effective & Low Maintenance
Lower installation costs than bridge cranes (no runway beams needed).
Durable construction reduces long-term maintenance.
6. Safety & Compliance
Equipped with overload protection, limit switches, and emergency stops.
Can be automated for hazardous environments.

Industrial Applications of Overhead Gantry Cranes
1. Manufacturing & Assembly Plants
Moving raw materials, machinery, and finished products.
Used in automotive, aerospace, and heavy equipment manufacturing.
2. Construction & Infrastructure
Lifting steel beams, concrete panels, and prefabricated structures.
Portable gantries assist in bridge and road construction.
3. Shipping & Ports (RTG & Container Handling)
Rubber-tired gantry (RTG) cranes stack and move shipping containers.
Shipbuilding yards use heavy-duty gantry cranes for hull assembly.
4. Warehousing & Logistics
Loading/unloading heavy pallets, machinery, and storage racks.
Adjustable gantries fit different warehouse layouts.
5. Steel & Metal Industries
Handling coils, sheets, and molten metal ladles.
Electromagnetic cranes for scrap metal processing.
6. Energy & Power Plants
Maintenance of turbines, generators, and transformers.
Nuclear and hydroelectric plants use specialized gantry cranes.
7. Mining & Heavy Material Handling
Transporting ore, large mining equipment, and drilling components.
8. Aviation & Aerospace
Assembling aircraft fuselage and engine components.

1. Design and Engineering

Detailed Engineering: Develop detailed engineering drawings and specifications, including the main beam, hoist, trolley, end carriages, and other components.

Simulation and Modeling: Use computer-aided design (CAD) and simulation tools to model the crane's performance and optimize its design.

2. Material Selection

Material Specifications: Select high-quality materials that meet the requirements for strength, durability, and heat resistance. Common materials include high-strength steel, alloys, and specialized coatings.

Procurement: Source materials from approved suppliers, ensuring they meet the necessary quality and certification standards.

3. Component Fabrication

Cutting and Shaping: Cut and shape raw materials into the required components, such as beams, columns, and brackets. This may involve processes like plasma cutting, laser cutting, and machining.Welding and Assembly: Weld components together to form the crane's structural elements. This includes welding the main beam, end carriages, and other load-bearing parts.

4. Assembly

Sub-Assembly: Assemble individual components, such as the hoisting system, trolley, and end carriages, into sub-assemblies. This involves fitting parts together and ensuring proper alignment.Main Assembly: Combine sub-assemblies to construct the complete crane structure. This includes mounting the hoist and trolley on the main beam, attaching the end carriages, and installing the control systems.

5. Integration of Systems

Electrical Systems: Install electrical components, including motors, control panels, wiring, and sensors. Ensure that the crane's electrical systems are properly integrated and tested.

Control Systems: Implement and configure control systems, such as programmable logic controllers (PLCs), remote controls, and safety devices. Verify that the control systems function correctly and are calibrated.

6. Testing and Quality Assurance

Pre-Operational Testing: Conduct pre-operational tests to check the crane's functionality, including load testing, operational testing of the lifting and traveling mechanisms, and control system checks.

Safety Testing: Verify that safety features, such as limit switches, alarms, and emergency stops, are working correctly and meet safety standards.

Inspection: Perform a detailed inspection of the crane's structure and components to ensure compliance with design specifications and quality standards.

7. Final Adjustments and Calibration

Fine-Tuning: Make any necessary adjustments to optimize the crane's performance and ensure smooth operation. This may include calibrating sensors, adjusting controls, and fine-tuning the lifting system.

Documentation: Prepare and review documentation, including operation manuals, maintenance guides, and safety instructions.

8. Delivery and Installation

Transport: Arrange for the transport of the crane to the installation site, ensuring that it is handled and shipped safely to prevent damage.

Installation: Oversee the installation of the crane at the customer's facility, including assembly, alignment, and connection to power sources and control systems.

Training: Provide training for operators and maintenance personnel to ensure they are familiar with the crane's operation and safety procedures.

9. Commissioning and Handover

Commissioning: Conduct final commissioning tests to verify that the crane operates correctly under real-world conditions and meets performance specifications.

Handover: Officially hand over the crane to the customer, providing all necessary documentation, including certificates of compliance, warranty information, and maintenance schedules.

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.

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