MG Typy Gantry Cranes

 

Why Choose an MG Type Gantry Crane?

✔ Heavy-duty lifting (200T+) with high stability.
✔ Customizable for harsh environments (marine, high-temp, explosive).
✔ Smooth, automated operation (VFD + PLC control).
✔ Lower lifetime costs than mobile cranes.

 

MG type gantry cranes are ideal for heavy-duty industrial lifting (5–200+ tons) with high stability and reliability. They are commonly used in shipbuilding, power plants, steel mills, and construction due to their double-girder strength and customizable features.

 

Advantages of MG Type Gantry Cranes

✔ High load capacity (up to 200T+).
✔ Sturdy double-girder design for heavy-duty use.
✔ Smooth & precise movement (VFD-controlled).
✔ Customizable span, height & lifting speed.
✔ Lower maintenance compared to mobile cranes.
✔ Suitable for indoor & outdoor use (with weatherproofing).

 

Comparison: MG vs. Other Gantry Cranes

Feature	MG Type (Double-Girder)	Single-Girder Gantry	Rubber-Tired (RTG)
Max Capacity	Up to 500T+	Up to 20T (usually)	Up to 100T
Span Range	10–35m+	5–25m	Adjustable
Mobility	Rail-mounted	Rail-mounted	Rubber wheels (mobile)
Cost	Higher (heavy-duty)	Lower (light-duty)	Highest (port use)
Best For	Factories, shipyards	Workshops, warehouses	Ports, container yards

 

Lifting Capacity: 30 metric tons (30,000 kg)
Span: 10m–35m (customizable)
Lifting Height: 6m–20m (adjustable)
Hoist Type: Double-girder with electric wire rope hoist (QD-type)
Travel System: Motorized (rail-guided or rubber-tired)
Wheel Type: Steel wheels (for rails) / Pneumatic tires (floor use)
Control System: Cabin-operated or remote control
Power Supply: 380V/50Hz (3-phase)
Structural Steel: Q345B (high-strength) with corrosion-resistant coating

Here's a detailed breakdown of the MG type gantry crane components, following Chinese standards (JB/T 5663) for double-girder electric gantry cranes:

 

1. Main Structural Components

A. Bridge Structure

Main girders (2x) - Welded box-type construction (standard) or truss design

End beams - Connect girders with integrated drive mechanisms

Diagonal bracing - Provides structural rigidity against torsion

 

 

B. Leg Assemblies

Rigid legs - Fixed connection to end beams (most common)

Flexible legs - Hinged connection for thermal expansion compensation

Cross beams - Connect legs at ground level for stability

C. Runway System

Crane rails (QU70/QU80/QU100/QU120)

Rail clamps - Anti-lift safety devices

Buffer stops - End-of-travel protection

 

2. Mechanical Systems

A. Hoisting Mechanism

Main hoist (standard configurations):

200t capacity: Typically uses 2x 100t hoists in tandem

Wire rope drum - Multi-layer winding design

Reducer - QJS series planetary gearbox

Brakes - YWZ5 series hydraulic thrusters

B. Trolley System

Trolley frame - Heavy-duty welded construction

Travel wheels - Forged steel, usually 4-8 wheels

Anti-skew system - Prevents trolley crab walking

C. Crane Travel System

Drive units - Typically 1/2 of wheels powered

Wheel groups - Balanced bogie assemblies

Rail sweepers - Debris clearance

3. Electrical Systems

A. Power Supply

Sliding cable system (CMC series collector)

Busbar system (for large span cranes)

Cable reels (for outdoor applications)

B. Control System

Main control panel - Usually Siemens or Schneider components

Variable frequency drives (VFDs for all motions)

PLC - For advanced control requirements

C. Operator Interfaces

Pendant station - Waterproof IP65 rating

Radio remote control (optional)

Cab control - ISO-certified operator cabin

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4. Safety Components

Component	Function
Load limiter	CJK-10 type with 110% cut-off
Limit switches	LX10-11 series for all motions
Anti-collision	Laser/ultrasonic for multi-crane areas
Anemometer	For outdoor cranes (≥20m height)
Emergency stop	Mushroom buttons at all controls

5. Special Configurations

Ladle hook assemblies - For metallurgical applications

Explosion-proof packages - For hazardous areas

Corrosion protection - Special coatings for marine environments

Heating systems - For cold climate operation

SKETCH

Main technical

 

1. High Load Capacity & Stability

Capacity range: 5–500+ tons (200-ton models are common).

Double-girder design provides superior strength compared to single-girder cranes.

Heavy-duty steel construction (Q345B/Q235B) for long-term durability.

2. Customizable Configurations

Adjustable span (10–35m+) and lifting height (6–30m+).

Rail-mounted (MG) or rubber-tired (RTG) options available.

Special variants: Explosion-proof, high-temperature, and corrosion-resistant models.

3. Smooth & Precise Operation

Variable Frequency Drives (VFDs) ensure jerk-free movement.

PLC-controlled automation for precise load positioning.

Dual-hoist systems (e.g., 200T main + 32T auxiliary hoist).

4. Energy Efficiency & Low Maintenance

Regenerative braking reduces power consumption.

Sealed gearboxes & automatic lubrication minimize wear.

Fewer moving parts than mobile cranes → lower maintenance costs.

5. Enhanced Safety Features

Overload limiter (cuts power at 110% capacity).

Anti-sway & collision avoidance systems.

Emergency stop (E-stop) + anemometer (for outdoor use).

 

1. Heavy Industries & Steel Plants

Handling steel coils, ladles, and castings.

Used in rolling mills, foundries, and forging shops.

2. Shipbuilding & Dry Docks

Lifting ship hulls, engines, and large components.

Common in ship repair yards and naval construction.

3. Power Plants & Energy Sector

Installing turbines, generators, and transformers.

Used in hydropower, nuclear, and thermal plants.

4. Ports & Logistics

Loading/unloading heavy containers, breakbulk cargo.

Rubber-tired (RTG) variants for container yards.

5. Construction & Infrastructure

Erecting bridge segments, precast concrete, and steel trusses.

Used in tunnel, dam, and railway projects.

6. Mining & Oil/Gas

Moving drilling rigs, pressure vessels, and mining equipment.

Deployed in offshore platform fabrication yards.

 

 

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.

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