What is an MH Type Box Single Girder Gantry Crane?

An MH Type Box Single Girder Gantry Crane is a specific classification of a gantry crane that combines a single, box-style main girder with a Moderate to Heavy-duty (MH) service rating. The "Box" refers to the girder's hollow, rectangular (box) construction, which provides superior strength and rigidity compared to a standard I-beam.

Think of it as a robust and versatile workhorse for industrial yards and factories-stronger than a light-duty crane but more cost-effective than a double girder system, perfect for frequent handling of substantial loads.

 

Advantages of MH Type Box Single Girder Gantry Cranes

Excellent Strength-to-Cost Ratio: The box girder provides much of the strength and rigidity of a double girder system at a lower cost, making it a highly cost-effective solution for heavy-duty applications.

Reduced Deflection: The box design minimizes girder sag, ensuring smooth and precise load control.

Durability for Demanding Use: Built with quality components to withstand regular, heavy use in industrial environments.

Versatility: Suitable for both indoor and outdoor applications across various industries.

Low Headroom: The under-hung design maximizes the available lifting height under the beam.

 

Comparison: MH Box Girder vs. Standard I-Beam Girder

Feature	MH Type Box Girder	Standard I-Beam Girder
Girder Design	Welded Box Section	Rolled I-Beam
Rigidity & Strength	Superior	Good
Resistance to Twisting	Excellent	Moderate
Deflection under Load	Minimal	More than a box girder
Ideal For	Heavier, more frequent use	Lighter, less frequent use

Conclusion: The MH Type Box Single Girder Gantry Crane is the definitive smart choice for businesses that need a durable, high-performance lifting solution without the expense of a double girder crane. Its robust box girder construction ensures reliable performance under frequent, heavy loads, making it an indispensable asset for a wide range of industrial material handling tasks.

 

Lifting Capacity 320 tons
Span (Width) 3 - 12 meters (adjustable)
Lifting Height 3 - 10 meters
Working Class A3-A5 (light to medium duty)
Hoisting Speed 0.5 - 8 m/min (variable)
Main Beam Type Single/double girder (box-type)
Power Supply 220V/380V 3-phase or manual
Control Mode Pendant control/wireless remote
Hoist Type Electric chain hoist/wire rope hoist
Travel Drive Manual push or motorized
Corrosion Protection Hot-dip galvanized or marine-grade paint
Wind Resistance Up to Beaufort scale 6 (for outdoor use)
Operating Temp -20°C to +50°C

The MH type box-structure single girder gantry crane is a light–medium duty lifting machine widely used in factories, warehouses, stockyards, and outdoor material handling. Its components are designed for stability, reliability, and easy maintenance.

1. Box-Type Main Girder

Welded box-section beam

High rigidity and low dead weight

Supports the hoist and trolley traveling track (I-beam or square rail)

2. End Carriages

Connect the main girder to the gantry legs

Equipped with traveling wheels and drive motors

Provide smooth, stable long-travel movement

 

3. Gantry Legs (Support Frame)

Vertical steel legs supporting the girder

Can be A-frame or straight-leg style

Transfer load directly to the ground or rail

4. Trolley & Hoist (Electric Hoist)

Typically equipped with CD/MD wire rope hoist or European-style hoist

Includes:

Hoist motor

Gearbox

Wire rope & drum

Hook block

Brake system

Moves horizontally along the lower flange of the main girder

 

5. Crane Traveling Mechanism

Drive motors (single or double)

Gear reducer

Wheels and shafts

Enables longitudinal movement along ground rails

 

 

6. Electrical System

Power distribution cabinet

Contactors, relays, PLC/VFD (optional)

Electrical wiring and protection system

Cable guide system (cable drum or flat-cable festoon)

7. Control System

Options:

Pendant control

Wireless remote control

Cabin control (optional)

Features overload protection, limit switches, emergency stop

 

 

8. Safety Protection Devices

Overload limiter

Lifting height limiter

Traveling limit switches

Rail sweeper

Buffers & end stops

Emergency stop button

Optional anti-collision sensors for multiple cranes

🔧 Optional Components

Frequency inverter (VFD) for smoother movement

Rain cover for hoist

Windproof clamp for outdoor use

Anti-sway control

Stainless steel electrical cabinet for harsh environments

SKETCH

 

Main technical

 

Advantages of MH Type Box Single Girder Gantry Crane

1. Lightweight Design & Cost Savings

Box-type single girder structure significantly reduces crane self-weight.

Lower material usage results in a more economical solution compared to double-girder cranes.

2. Easy Installation & Maintenance

Simple structure with fewer components.

Easy access to maintenance points reduces downtime and service cost.

3. High Rigidity & Stable Performance

Welded box girder offers strong torsional resistance.

Ensures stable and smooth lifting even under frequent operation.

4. Efficient Space Utilization

Compact design ensures maximum lifting height with minimal building clearance.

Ideal for small to medium-sized working areas.

5. Multiple Control Options

Pendant control, wireless remote, or cabin control (optional).

Flexible operation to suit different working environments.

6. Strong Adaptability

Suitable for indoor and outdoor use.

Can be equipped with wire rope hoist, chain hoist, or European hoist.

7. High Safety Standards

Comes with overload protection, limit switches, emergency stop, and buffer devices.

Optional anti-sway and VFD control for smoother, safer operation.

8. Customizable Configuration

Span, lifting height, speed, and hoist type can be tailored based on customer requirements.

Applications of MH Type Box Single Girder Gantry Crane

The MH type is a light-to-medium duty gantry crane widely used for material handling in various industries, including:

1. Warehouses & Workshops

Lifting materials, components, and finished products.

Ideal for assembly, machining, and maintenance tasks.

2. Outdoor Yards & Storage Areas

Handling steel materials, pipes, plates, and timber.

Used in logistics yards, freight stations, and distribution centers.

3. Construction Sites

Transporting building materials such as concrete blocks, beams, and tools.

Efficient for temporary or permanent lifting operations.

4. Manufacturing Plants

Suitable for machinery manufacturing, fabrication shops, and production lines.

5. Railway & Transportation

Loading and unloading cargo in railway depots and logistics hubs.

6. Marble, Granite & Stone Processing

Used for lifting slabs, blocks, and heavy stone products safely.

7. Small Shipyards & Repair Yards

Material handling for small vessels, engines, and marine components.

The manufacturing process of the MH Type Box Single Girder Gantry Crane follows strict quality-control standards to ensure high strength, reliability, and long service life. The typical production procedure includes:

 

1. Raw Material Selection & Inspection

Select high-quality structural steel plates and profiles.

Ultrasonic & mechanical inspection of raw materials to confirm no internal defects.

Steel grade, thickness, and certificates checked by QC before entering production.

 

2. CNC Cutting & Plate Preparation

Use CNC plasma/laser cutting machines to cut main girder and end girder plates.

Automatic edge grinding and beveling for precise weld preparation.

All parts labeled for traceability and assembly accuracy.

 

3. Girder Assembly & Welding

Main Girder Production

Box structure formed with upper cover plate, lower plate, and web plates.

CO₂ gas-shielded automatic welding or submerged arc welding.

Longitudinal and transverse welds completed according to welding procedure specification (WPS).

End Carriage Fabrication

Machining of wheel seats, stiffeners, and connection ribs.

Assembly and welding with CNC assistance to ensure geometric precision.

 

4. Stress Relief & Shot Blasting

Full girder stress-relief treatment (natural aging or heat treatment).

Shot blasting to Sa2.5 surface grade to remove rust, scale, and welding residues.

Surface roughness optimized for paint adhesion.

 

5. Machining & Precision Correction

Machining of wheel axles, connection flanges, and mounting surfaces.

Dimensional inspection and correction for:

Girder straightness

Camber

Verticality

Wheel alignment and tolerance

 

6. Painting & Anti-corrosion Treatment

Primer: Epoxy zinc-rich or epoxy anti-rust primer.

Middle coat: Epoxy build coat.

Top coat: Polyurethane finishing paint.

Total film thickness generally 120–240 μm depending on working environment.

 

7. Hoist Production & Assembly

Installation of CD/MD electric wire rope hoist or customized hoist.

Hoist assembly includes:

Motor

Gearbox

Drum

Wire rope

Hook block

Limit switches

Dynamic load and no-load running tests performed.

 

8. Electrical System & Control

Installation of electrical panels, main relay control, or inverter control system.

Wiring of power supply, trolley operation, and safety devices.

Installation of:

Overload limiter

Emergency stop

Phase protection

Anti-collision sensors (optional)

 

9. Pre-Assembly & Test Running

Temporary pre-assembly of girder, end carriages, hoist, and electrical system.

Conduct:

No-load test

Static load test (125% of rated load)

Dynamic load test (110% of rated load)

Traveling & lifting synchronization checks

 

10. Final Inspection & Packaging

Final QC inspection following ISO 9001 and crane standards.

Painting touch-up and rust protection for shipping.

Packing with:

Plastic film

Steel pallet

Reinforced wooden cases for electrical parts

Shipping documents and inspection reports issued.

 

11. Delivery & Installation Support

Provide installation drawings, foundation layout, and instruction manuals.

On-site engineer guidance available if required.

Final commissioning at customer site.

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%.