Hefei Kiwi Heavy Machinery Co., Ltd.
Hefei Kiwi Heavy Machinery Co., Ltd.
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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.