Hefei Kiwi Heavy Machinery Co., Ltd.
Hefei Kiwi Heavy Machinery Co., Ltd.
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Design of 16 ton double girder end carriage suitable for bridge crane
1. Structural design
Box-type structure: The end beam usually adopts a box-type cross-section design, and the internal stiffened plate enhances rigidity and torsion resistance to ensure stability under dynamic loads.
Modular design: To facilitate transportation and on-site installation, the end beam may be connected to the main beam by high-strength bolts to reduce the need for on-site welding.
Symmetrical layout: The end beams on both sides of the double-beam bridge crane are symmetrically distributed to ensure that the load is evenly transferred to the track and avoid wear caused by eccentric loading.
2. Materials and manufacturing
High-strength steel: Q235B or Q345B steel is commonly used, taking into account both strength and toughness. Low-alloy steel may be used in some key parts to improve the load-bearing capacity.
Welding process: Automated welding technology (such as submerged arc welding) is used to ensure the quality of the weld, and internal defects are avoided through flaw detection.
Processing accuracy: The mounting holes at both ends of the end beam and the track contact surface need to be processed with high precision to ensure the coaxiality of the wheel assembly installation and reduce running resistance.
3. Drive and travel system
Drive type: usually "one-side drive" or "double-side drive", 15-ton cranes may use double-side drive to ensure smooth operation of the trolley.
Wheel set configuration: double-rim wheel design to prevent derailment; wheel material is cast steel (such as ZG340-640), surface quenching treatment to enhance wear resistance.
Wheel pressure calculation: according to the 15-ton rated load and deadweight, the wheel pressure distribution is reasonably designed to avoid local overload of the track.
4. Safety and protection
Buffer device: polyurethane or spring buffers are installed at both ends of the end beam to absorb collision energy and protect the structure and track.
Limit switch: set the trolley travel limit switch, link the electrical system to achieve automatic power off, and prevent overtravel accidents.
Wind protection device (optional): if used outdoors, the end beam may be integrated with a rail clamp or anchor device to prevent strong winds from moving the crane.
5. Dynamic performance and load
Dynamic load coefficient: The lifting impact is considered during the design (such as 1.1~1.3 times the static load), and the end beam needs to withstand the impact load at the moment of lifting.
Fatigue strength: For frequent start-stop conditions, fatigue life calculation is performed to ensure that the end beam has no cracks under long-term alternating loads.
6. Adaptability and compatibility
Track matching: The wheel spacing (base spacing) of the end beam is strictly matched with the track model (such as QU70/QU80) to reduce the risk of rail gnawing.
Span adjustment: By adjusting the length of the end beam to adapt to different plant spans (such as 7.5~34.5 meters), the applicability of the crane is improved.