Single girder gantry cranes are versatile and cost-effective lifting solutions, ideal for applications where overhead cranes are not feasible. They offer excellent mobility and cover a wide working area. Among them, three models stand out for their unique designs and capabilities: the L Electric Trolley Single Girder Gantry Crane, the MH Truss-Type Single Girder Gantry Crane, and the Box-Type Single Girder Semi-Gantry Crane. This guide will delve into what they are, their key features, components, and ideal application scenarios to help you choose the right one for your needs.
L Electric Trolley Single Girder Gantry Crane
What is it?
The L Electric Trolley Single Girder Gantry Crane is a highly efficient gantry crane characterized by its use of a low-headroom (L-type) electric hoist as the lifting trolley. This design integrates the hoist and trolley into a compact unit that runs along the bottom flange of the single girder, the lifting height under the hook—a critical advantage in spaces with limited headroom.
Advantages & Features
Lifting Height:The low-headroom design provides the highest possible hook lift in low-clearance facilities.
Smooth & Precise Operation:Electric trolley travel ensures smoother, more controlled, and precise positioning of loads compared to manual push types.
Excellent Stability:The compact and integrated design offers superior stability during lifting and travel.
Higher Duty Cycle:Suitable for more frequent use than cranes with manual trolleys.
Improved Safety:Equipped with limit switches, overload protection, and fail-safe brakes.
Main Components
Single Girder (Main Beam):Typically a welded I-beam or box girder.
Legs (End Trucks):Two rigid legs that support the girder, equipped with wheels for mobility.
L Electric Trolley Hoist:The core component, combining the hoist, electric motor, and trolley frame into one unit.
Electric Travel System:Separate motors for the crane's long travel (gantry movement) and the trolley's cross travel.
Control System:Pendant station or radio remote control for easy and safe operation.
Application Scenarios
Workshops and Factories with low ceiling heights.
Warehouses for loading and unloading goods from trucks and stacking.
Assembly Lines for handling components and finished products.
Repair Shops and maintenance bays.
MH Truss-Type Single Girder Gantry Crane
What is it?
The MH (Material Handling) Truss-Type Single Girder Gantry Crane features a main girder constructed from a truss structure—a framework of steel rods arranged in a triangular pattern. This design prioritizes strength-to-weight ratio, making it ideal for lighter structures and longer spans where a solid web girder would be too heavy.
Advantages & Features
Lightweight & Economical:The truss structure uses less steel, reducing the overall crane weight and cost.
Reduced Dead Weight:Puts less stress on the ground or supporting structure, ideal for temporary setups or softer floors.
Excellent Wind Permeability:The open web design allows wind to pass through, making it more stable for outdoor use in windy conditions.
Long Span Capability:Well-suited for applications requiring spans longer than standard box girders can efficiently handle.
Easy Maintenance:The open structure allows for easy access to components like wires and tracks.
Main Components
Truss Girder (Main Beam):A lattice framework made of angled steel sections.
Legs (End Trucks):Often made of truss or lattice structure to match the girder, providing support and mobility.
Hoist and Trolley:Can be equipped with a wire rope hoist or chain hoist, which can be manual or electric.
Travel System:Manual push or motorized drive for gantry movement.
Application Scenarios
Outdoor Storage Yards for lumber, steel pipes, and construction materials.
Construction Sites for temporary lifting tasks.
Water Treatment Plants and other utility facilities.
Applications with very long spans and budget constraints.
3. Box-Type Single Girder Semi-Gantry Crane
What is it?
The Box-Type Single Girder Semi-Gantry Crane has one leg running on a ground rail and the other end running on an elevated runway beam attached to the building structure. Its main girder is a robust, enclosed box section, offering great rigidity and strength.
Advantages & Features
Space-Saving Design:The semi-gantry configuration frees up floor space on one side, allowing unobstructed access for vehicles and personnel.
High Rigidity & Strength:The box girder design provides excellent resistance to bending and torsion, ensuring smooth and stable operation.
Ideal for Wall-Side Operations:Perfect for workshops where one side of the work area is against a wall or a column line.
Superior Hook Coverage:Can cover a wide area along the wall and extend into the open floor space.
Durability:The enclosed box girder is robust and protects internal components from dust and debris.
Main Components
Box Girder (Main Beam):A welded steel section with a rectangular, hollow profile.
Free Leg:One leg that runs on a ground track.
Top-Running End:The other end of the girder that runs on a top-mounted runway beam fixed to the building's column or structure.
Hoist and Trolley:Typically an electric hoist (like an L-type hoist or a standard electric hoist) on an electric trolley.
Runway System:Includes the elevated runway beam and the ground rail.
Application Scenarios
Workshops with limited floor space and existing supporting columns.
Loading Bays where the crane operates between a truck and a wall.
Production Lines located along the side of a building.
Any application where a full gantry crane would obstruct critical floor space.
Choosing the right single girder gantry crane depends on your specific operational needs
For low headroom and frequent, precise indoor use, the L Electric Trolley Crane is unmatched.
For outdoor, the MH Truss-Type Crane is a perfect fit.
For floor space in workshops with wall-side operations, the Box-Type Semi-Gantry Crane is the ideal solution.
By understanding the distinct profiles of these three crane types, you can make an informed decision that boosts your productivity and efficiency.
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