10 Ton European Single Girder Bridge Crane Designed For Factory Use

Features of the end carriage of a 10-ton European single-girder  bridge crane designed for factory use

1. Lightweight and compact structure
Box beam section: rectangular or trapezoidal closed box structure is adopted, and the thickness of the steel plate is customized according to the load calculation (usually 8~12mm), taking into account both strength and lightness.

Low height design: the total height of the end beam is controlled at 300~400mm, which reduces the space occupied by the whole machine and is suitable for workshops with limited clearance.

Single-side drive configuration: 10-ton single beam usually adopts single-side drive (one side of the end beam is installed with the drive system, and the other side is the driven wheel), which simplifies the structure and reduces costs.

2. Drive and travel system
Three-in-one drive unit: integrated motor, brake, reducer (such as SEW or Nord brand), power range 3~5.5kW, protection level IP55 or above.

Wheel set design:

Wheel diameter: usually Φ250~300mm, double-rim forged steel wheel (surface quenching hardness HRC45+), to prevent derailment.

Wheel pressure distribution: Two wheels are set on a single end beam, and the wheel pressure is ≤10 tons/wheel (adjusted according to the actual span).

Frequency conversion control: Standard frequency conversion speed regulation (0~20m/min stepless speed change), reducing the start-stop impact and extending the life of the structure.

3. Connection and load-bearing characteristics
Main beam-end beam connection:

Flange bolt connection: The top of the end beam is rigidly connected to the single main beam welding end through a high-precision flange surface, and is fixed with 8.8 or 10.9 grade high-strength bolts.

Anti-eccentric load design: Transverse ribs are set inside to enhance torsion resistance and cope with single beam load skew conditions.

Load adaptability: The wheel pressure error of the end beam design is ≤5%, and the wheel pressure is fine-tuned through an articulated balance beam or eccentric shaft to reduce track wear.

4. Safety and protection
Buffer device: Polyurethane buffers are installed at both ends of the end beam (impact energy absorption ≥50J), and the collision distance is adjustable.

Limit system: integrated trolley travel limit switch bracket, supporting mechanical or photoelectric limit triggering.

Protection level: drive motor and junction box protection level IP55, suitable for dusty and humid environments.

5. Manufacturing process details
Welding process: key welds use CO₂ gas shielded welding, weld flaw detection (UT/MT) coverage ≥ 20%.

Processing accuracy:

Wheel mounting hole coaxiality ≤ Φ0.2mm.

Track contact surface flatness ≤ 1mm/m.

Surface treatment: sandblasting and rust removal (Sa2.5 level) followed by spraying epoxy zinc-rich primer + polyurethane topcoat, thickness ≥ 120μm.

6. Special scene adaptation
Low clearance optimization: "ultra-low clearance" end beams can be customized to further compress the structure height (for example, ≤ 280mm).

Explosion-proof configuration: explosion-proof motors and brakes (Ex d IIB T4 level) can be selected for chemical and other scenes.

Low temperature environment: Low temperature impact toughness steel (such as Q345D) and low temperature grease are used for working conditions below -20℃.