Mh Type Single Beam Box Gantry Crane
Products Description
Key Features:
Single Box Girder Design
The main beam is constructed in a box-shaped (enclosed) cross-section, providing high strength and rigidity.
Offers better load distribution and resistance to bending compared to I-beam gantry cranes.
Gantry Structure
Supported by legs on both sides, which can be fixed or adjustable in height.
Can be semi-gantry (one side on a runway, the other on legs) or full gantry (both sides on legs).
Hoisting Mechanism
Equipped with an electric hoist (wire rope or chain) that travels along the box girder.
Common hoist types: Electric Wire Rope Hoist (EOT), Chain Hoist, or even a trolley with a winch.
Mobility Options
Fixed (Static) Gantry: Permanently installed in one location.
Mobile Gantry: Equipped with wheels (manual or motorized) for movement along rails or the ground.
Load Capacity & Span
Typically ranges from 5 tons to over 100 tons.
Span (distance between legs) can vary from 5m to 35m or more.
Comparison with Double Girder Gantry Cranes:
| Feature | Single Beam Box Gantry | Double Girder Gantry |
|---|---|---|
| Load Capacity | Up to ~50-100T | 100T+ |
| Span | Medium (~5-35m) | Large (~10-40m+) |
| Height | Limited by single girder | Higher lift (more clearance) |
| Cost | More economical | More expensive |
Warranty of core components：1 Year
Core Components：PLC, Bearing, Gearbox, Motor, Gear
Condition：New
Warranty：1 Year
Weight (KG)：500 kg
Feature：Gantry Crane
Product name：Single Girder Gantry Crane
Color：Customized
Capacity：1-20t
Type：Single Girder
Power supply：110V/220V/230V/380V/440V
Control Method：Ground Control+ Remote Control (customized)
Lifting mechanism：Eliectric Hoist
Work Duty：A3-A4
Pictures & Components
A single beam box gantry crane consists of several key components that work together to ensure safe and efficient lifting operations. Below is a detailed breakdown of its main parts:
1. Main Components of a Single Beam Box Gantry Crane
A. Box Girder (Main Beam)
The primary load-bearing structure, made of welded steel plates in a box-type (rectangular) cross-section.
Provides high rigidity and strength, minimizing deflection under heavy loads.
Designed to support the hoist and trolley that move along its length.
B. End Carriages (Legs/Supports)
Two vertical steel legs that support the box girder.
Can be fixed or adjustable in height.
Equipped with wheels or rails for mobility (if it's a mobile gantry crane).
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C. Hoist & Trolley
Electric hoist (wire rope or chain) for lifting loads.
Trolley mechanism allows the hoist to travel along the girder.
Common types:
Electric Wire Rope Hoist (EOT) – For heavy-duty lifting.
Chain Hoist – For lighter loads.
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D. Runway System (for Mobile Gantry Cranes)
Rail tracks or wheels for smooth movement.
Can be motorized (electric travel) or manual push-type.
Includes brakes and limit switches for safety.
E. Electrical System
Control panel & pendant station (wired or wireless remote).
Power supply (cable reel or festoon system).
Limit switches & overload protection for safe operation.
F. Bracing & Cross Beams
Diagonal or horizontal reinforcements to improve stability.
Prevents lateral swaying under load.
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G. Safety Devices
Overload limiter – Prevents lifting beyond capacity.
Emergency stop button – For instant shutdown.
Anti-collision sensors (if multiple cranes operate in the same area).
Buffer & bumper – Absorbs impact at travel limits.
2. Optional Components
Cabin (Operator's cabin) – For cranes with frequent use.
Variable frequency drive (VFD) – For smoother acceleration & braking.
Weighing system – Integrated load measurement.
Festoon or cable reeling system – For power supply management.
Sketch
Main technical
Advantages
1. High Load Capacity & Strength
The box girder design provides superior stiffness and load-bearing capacity compared to I-beam gantries.
Suitable for 5 to 100 tons, making it ideal for medium-to-heavy-duty applications.
2. Excellent Stability & Rigidity
The closed-box structure resists twisting and bending, ensuring smooth and safe lifting.
Minimal deflection under heavy loads, improving precision in material handling.
3. Durability & Long Service Life
Made from high-quality welded steel, resistant to wear, corrosion, and harsh environments.
Requires less maintenance than open-web or I-beam designs.
4. Cost-Effective Solution
More affordable than double girder gantry cranes while offering similar strength.
Lower installation and operational costs compared to overhead cranes.
5. Flexible Mobility Options
Can be fixed, semi-gantry, or fully mobile (with rail or wheel systems).
Motorized travel options available for automated movement.
6. Easy Installation & Customization
Modular design allows for adjustable span, height, and lifting speed.
Can be fitted with different hoists (wire rope or chain) based on requirements.
7. Safety Features
Equipped with overload protection, limit switches, and emergency brakes.
Anti-sway technology ensures stable and controlled lifting.
Application:
1. Steel & Metal Processing
Handling steel coils, plates, molds, and castings.
Loading/unloading in rolling mills and forging shops.
2. Construction & Infrastructure
Lifting precast concrete beams, pipes, and construction materials.
Assembly of bridge components and large structural parts.
3. Shipbuilding & Ports
Moving ship parts, engines, and containers.
Used in dry docks and ship repair yards.
4. Warehousing & Logistics
Transporting heavy machinery, pallets, and bulk materials.
Used in large storage yards and freight terminals.
5. Manufacturing & Heavy Industries
Installing industrial equipment, generators, and turbines.
Handling large molds in foundries and automotive plants.
6. Power Plants & Renewable Energy
Maintenance of transformers, boilers, and wind turbine components.
Used in hydroelectric and nuclear facilities.
Crane production procedure
1. Demand Analysis and Design
Demand Collection: Communicate with customers to understand their specific needs and usage environment, including lifting capacity, lifting height, span, etc.
Design Plan: Carry out preliminary design according to the needs to determine the technical parameters and overall structure of the crane.
CAD Modeling: Use computer-aided design software (such as AutoCAD, SolidWorks, etc.) to draw detailed engineering drawings, including the dimensions and specifications of each component.
2. Material Preparation
Material Selection: According to the design requirements, select suitable steel, aluminum or other materials to ensure sufficient strength and durability.
Material Procurement: Purchase the required raw materials according to the material list, including main beams, end beams, wheels, hooks and other components.
3. Processing and Manufacturing
Cutting: Cut large pieces of material into the required size according to the design drawings.
Forming: Bend, weld, drill and other processes are performed on the cut materials to form main beams, end beams, brackets and other components.
Surface Treatment: Surface treatment is performed on the processed parts, including sandblasting, rust removal, painting, etc., to improve corrosion resistance and aesthetics.
4. Assembly of components
Main beam assembly: weld or bolt the main beam, end beam and other supporting structures to form an overall frame.
Hoisting system installation: install hoisting system components such as motors, reducers, drums, hooks, etc. to ensure smooth operation of the system.
Operating mechanism installation: install the operating mechanisms of the trolley and the trolley, including wheels, tracks and drive systems.
5. Electrical system wiring
Electrical component installation: install electrical components such as control boxes, switches, inverters, limit switches, etc.
Wiring: perform cable wiring according to electrical drawings to ensure that the electrical system is safe and reliable.
Testing: perform preliminary tests on the electrical system to ensure that all functions are normal.
6. Overall debugging
System testing: perform overall debugging of the crane, test various functions such as lifting, moving, braking, etc., to ensure smooth operation.
Safety detection: check whether various safety devices (such as overload protection, limit switches, sound and light alarms, etc.) are working properly.
7. Quality inspection
Internal inspection: conduct a comprehensive quality inspection of the whole machine to ensure that all indicators meet the design requirements and safety standards.
External inspection: If necessary, invite a third-party organization to conduct external inspection to ensure the qualification of the product.
8. Delivery and installation
Packaging and transportation: Pack qualified cranes and arrange transportation to the customer's designated location.
On-site installation: Install and debug the crane at the customer's site to ensure that the installation meets safety standards.
Training and delivery: Train the customer's operators, explain the use, maintenance and safety precautions of the equipment, and officially deliver it for use.
9. After-sales service
Regular maintenance: Provide regular maintenance and maintenance services to ensure the long-term safe and stable operation of the equipment.
Fault handling: Provide fault diagnosis and repair services according to customer needs to ensure that the customer's equipment can be restored to operation in a timely manner.
hey can operate and maintain the equipment proficiently. Formal delivery of the crane, provide relevant technical information and warranty services.
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%.
Workshop view
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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