Filter refers to the equipment with built-in filter screen device for filtering medium particles and is usually installed at the inlet ends of the power equipment (water pump, etc.) and the precision equipment, wherein the particle filtering size can be selected according to the design requirements and the built-in dismountable filter drum can be conveniently taken out for cleaning. Generally, the filters which are usually not provided with action parts can be widely applied in the fields of metallurgy, chemical product, petroleum, papermaking, medicine, food, mining, electric power, urban water supply and drainage, etc.More