2. box beam using steel plate welded into a box structure, with high security, rigidity and other characteristics. Generally used for large tonnage and large tonnage gantry crane. Such as the right MGhz1200, from the weight of 1,200 tons, is the largest gantry crane, the main beam with a box beam structure. Box girder also has high cost Chengdu crane, self-important, poor wind resistance and other shortcomings. 3. Cellular beams are generally referred to as "honeycomb isosceles triangle beam" Bridging the crane, master Ends triangle, there are cranes on both sides of the honeycomb oblique abdomen, upper and lower portions have a chord. Cellular beams and joists absorb the characteristics of box girder crane mechanic, compared with joist with greater rigidity, the smaller the deflection, and higher reliability. However, due to the use of welded steel, the weight and the cost is slightly higher than the joist. Applicable to the use of frequent or large venues or lifting beam field. Because of this beam type is the patented product, thus producing fewer manufacturers. Hydropower Station Gantry cranes are mainly used for lifting and Gate, but also for the installation. Lifting capacity of 80 to 500 tons, small span of 8 to 16 m; the lower lifting speed of 1 to 5 m / min. This crane lifting, though not often, but once the work is very heavy use, it should be appropriate to improve the working level. Lifting workers, Weining cranes, heavy generous generous by heavy machinery Co., Ltd., Henan Province. Heavy Machinery Co., Ltd., Henan Province, generous (www.hnqizhongshebei.com) (www.hnqizhongshebei.com) strong, credible, in Zhengzhou, Henan engineering, construction crane industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving generous innovative ideas will lead into the brilliant heavy and you work for a better future!