The cover plate of sewage ditch is also called "ditch cover" and "manhole cover". The "manhole cover" was originally made of cement and cast iron, but later it is easily damaged in normal use, and the replacement cost is high. It is made of steel grating plate by pressure welding, so it has the advantages of simple construction and installation, light weight, good bearing, strong impact resistance, excellent drainage, beautiful use of product surface after hot galvanizing treatment, rust prevention and corrosion prevention, and incomparable advantages of cast iron trench cover plate. It is welded with steel grating plate. It has simple installation and construction, light weight, good bearing, good impact resistance, better bending than bending, large drainage capacity, beautiful and durable after hot-dip galvanizing, anti-corrosion and rust prevention, and has the incomparable advantages of cast iron trench cover plate. Because the steel grating is hinged, it is easy to open and has anti-theft function. Ditch covers are widely used in chemical plants, pharmaceutical plants, paper mills, sewage treatment plants, food manufacturers, municipal roads, garden facilities, residential areas, schools, stadiums and other places.