苏联给我厂制造的设备中有一部分入孔是用的碟形头盖,碟形头盖应用在入孔上在资料中也有记载。使用碟形头盖能用薄钢板代替厚钢板,节省了钢材,减轻头盖的重量,便于检修时入孔的开闭。一、根据计算比较优缺点所使用的入孔公称直径多为450公厘和500公厘两种。今以公称压力Py=25公斤/公分~2,材料用CT-5,其σb=5000公斤/公分~2。1.计算平板头盖所需的厚度; The Soviet Union to my factory manufacturing equipment has a part of the hole into the disc-shaped head cover, disc-shaped head cover applied to the hole in the information is also documented. The use of disc-shaped head cover can replace the thick steel plate, save the steel, reduce the weight of the head cover, easy access to open and close the hole. First, according to the calculation of the merits and demerits used by the hole nominal diameter of more than 450 mm and 500 mm two. Now with the nominal pressure Py = 25 kg / cm ~ 2, the material with CT-5, the σb = 5000 kg / cm ~ 2.1 to calculate the required thickness of the flat head cover;