The single girder gantry crane has two types of gantry legs: L-shaped and C-shaped. L-shaped manufacturing and installation are convenient, with good stress conditions and relatively small self weight
However, the space for lifting goods through the support legs is relatively small. The C-shaped legs are designed to be inclined or curved, with the aim of providing ample lateral space for goods to pass smoothly through the legs. 2. The double main beam gantry crane has strong bearing capacity, large span, good overall stability, and many varieties. However, its own weight is larger than that of a single main beam gantry crane with the same lifting capacity, and the cost is also higher. According to the different structures of the main beam, it can be divided into two forms: box girder and truss. Box shaped structures are generally used.
Protective device for gantry crane: 1 Overload limiter. 2. High quality, long-term use, impact resistant polyurethane buffer. 3. Crane travel limit switch. 4. Voltage loss protection and phase mismatch protection. 5. Emergency parking system. 6. Lifting height limiter.