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℃.
