Views: 7 Author: Jenny Chen Publish Time: 2026-04-24 Origin: Zhejiang Vertex Machinery Co., Ltd.
An under running single girder overhead crane is an efficient and space-saving lifting solution widely used in workshops, warehouses, and production lines. Designed to run beneath the runway beams, this type of crane maximizes facility space while ensuring smooth and precise material handling.
Unlike top-running cranes, the under running crane is suspended from the building structure or ceiling. The crane bridge travels along the underside of runway beams, making it ideal for facilities with limited headroom or where floor space must be fully utilized.
Understanding each component helps users make better purchasing and maintenance decisions:
The bridge girder is the main horizontal beam that supports the hoist and trolley. It carries the load and moves along the runway system.
The electric hoist is the core lifting unit. It is responsible for lifting and lowering loads via a wire rope or chain system. It is mounted on the trolley for lateral movement.
The trolley frame allows the hoist to move left and right along the bridge girder, providing precise horizontal positioning of loads.
Installed at both ends of the bridge girder, the end trucks enable the entire crane to travel along the runway beams.
The runway beams are fixed structural elements that support the crane system and define its travel path.
Bridge drive: Moves the crane along the runway
Trolley drive: Moves the hoist along the girder
These systems ensure smooth and controlled operation.
The crane is powered through:
Conductor lines (for main power supply)
Festoon systems (for flexible cable management)
The pendant control allows operators to control lifting, lowering, and movement safely from the ground.
The hook block and wire rope are responsible for directly handling the load, ensuring safe lifting operations.
End stops: Prevent over-travel
Trolley stops: Ensure safe limits of movement
Space-saving design – Ideal for low headroom facilities
Cost-effective – Lower installation and structural costs
Flexible installation – Can be suspended from existing structures
Smooth operation – Precise load positioning
Reduced building load requirements
Manufacturing workshops
Warehouses and logistics centers
Assembly lines
Light to medium-duty industrial operations
At Zhejiang Vertex International Trade Co., Ltd. we specialize in high-quality lifting equipment including electric chain hoists, wire rope hoists, and customized crane systems.
We provide:
OEM & customized solutions
Stable performance with CE & ISO certifications
Competitive pricing for global distributors
Reliable delivery and technical support
The under running single girder overhead crane is an excellent choice for businesses seeking efficient, compact, and reliable lifting solutions. By understanding its components and advantages, you can select the right system to improve productivity and safety in your operations.
