Design of 32ton double girder end carriage suitable for bridge
crane
1. Strengthened structural design
Heavy-duty box beam structure: welded with thickened steel plates
(such as Q345D high-strength steel, plate thickness 12-20mm),
larger box section size (typical section height 400-600mm), bending
stiffness increased by about 30%, meeting the fatigue strength
requirements of 32 tons load and frequent start-stop.
2. High-power dual-drive system
High-torque three-in-one drive: equipped with high-power motors
(such as 15-22kW), planetary reducers and electromagnetic brakes
(brands such as NORD), the single-side drive torque can reach more
than 20kN·m, ensuring that the trolley accelerates smoothly
(0.2-0.8m/s²) when fully loaded with 32 tons and the
synchronization error is less than 5%.
Four-corner independent drive configuration (optional): Some
long-span (≥30m) models adopt a four-drive design to avoid the
"snake-like" operation of the trolley and reduce track wear.
3. High-precision guidance and stability
Double-rim wheel + horizontal guide wheel set: wheel diameter
φ500-630mm, wheel pressure evenly distributed (≤250kN/wheel),
horizontal wheel set preload adjustable to adapt to track
straightness deviation ±3mm/m.
Laser calibration process: The end beam and main beam are laser
calibrated as a whole after assembly to ensure that the wheel
diagonal error is ≤3mm, reducing the risk of running deviation.
4. Modular heavy-duty connection
Flange bolt group connection: The main beam and end beam are
flange-connected with M24-M30 high-strength bolts (grade 10.9),
with a preload of 400-600kN, ensuring that the joint surface is
tightly fitted and the shear resistance is increased by more than
50%.
Removable drive module: The drive unit and end beam adopt a plug-in
design. There is no need to disassemble the overall structure of
the end beam during maintenance, and the replacement time is
shortened to 4-6 hours.
5. Enhanced safety protection
Multi-level buffer system: Both ends of the end beam are equipped
with hydraulic buffers (energy absorption ≥ 5000J) and rubber
anti-collision blocks for dual protection, with a maximum buffer
distance of 200mm and a collision force reduction of 60%.
Real-time status monitoring: Integrated vibration sensor and
temperature monitoring module, real-time feedback of bearing
temperature rise (alarm threshold ≤ 80℃) and wheel runout data to
prevent mechanical failure.
6. Adaptability to harsh environments
Heavy anti-corrosion coating: Surface treatment reaches Sa2.5 level
sandblasting, epoxy zinc-rich primer (80μm) + polyurethane topcoat
(60μm), salt spray test ≥ 1000 hours, suitable for C5-M level
corrosion environments such as metallurgy and chemical industry.
High temperature resistant design: Drive motor insulation grade F
(resistant to 155℃), gearbox lubricant uses synthetic high
temperature oil (applicable to -30℃ to +120℃).
7. Intelligence and low maintenance
Automatic lubrication system: The travel wheel bearing is equipped
with a centralized lubrication interface, which can be connected to
an automatic oil injection pump (with programmable intervals) to
reduce manual maintenance.
