General purpose overhead crane
Underslung (Suspension) Overhead Crane
Product Overview
The Underslung Overhead Crane, also known as a suspension crane, hangs from and travels along the underside of an existing roof or ceiling structure rather than running on top of columns via a dedicated runway. This design is chosen when a building’s existing roof trusses can support the crane load, avoiding the cost of installing dedicated support columns and runway beams.
Structure Composition
- Main Girder: A single or double girder, sized for the required capacity and span, suspended below the runway beams rather than supported from underneath.
- Suspension Runway Beams: Fixed to and suspended from the building’s existing roof trusses or overhead steel structure, running the length of crane travel.
- End Trucks: Underslung end trucks with wheels that ride on the lower flange of the suspension runway beam.
- Electric Hoist: A wire rope or chain hoist mounted on the main girder, sized to the required capacity.
- Control: Pendant control is standard; remote control is available for larger installations.
Application
- Existing buildings where the roof structure can support crane loads but no dedicated support columns are available
- Retrofitting crane capability into an older building without major structural modification
- Facilities where floor-mounted columns would obstruct existing equipment or floor space
- Light-to-medium manufacturing and warehouse applications
Key Features
- Avoids the cost and floor-space impact of dedicated support columns, since the crane hangs from the existing roof structure
- Can be installed as a single crane or as multiple parallel bridges sharing the same suspension runway system
- Lower installation cost in buildings with adequate existing roof steel, compared to a full new runway system
- Compact profile suited to buildings with limited overhead clearance
Technical Parameters (Reference Range)
Lifting Capacity: 0.5–10 t
Span: 6–20 m
Lifting Height: 4–12 m
Working Class: A3, A4
Control Mode: Pendant or remote control
Safety Devices
Overload limiter, hoist upper/lower limit switch, travel limit switches, suspension point load monitoring, emergency stop button, end stops on the suspension runway.
Customization Options
Suspension runway beam sizing to match the existing roof structure’s load capacity, single or multiple bridge configuration, hoist type (wire rope or chain), and span/capacity engineered to the specific building’s structural survey results.
