The Screw sludge dewatering machine, also known as the screw sludge dewatering machine, sludge treatment equipment ,sludge extruder ,sludge extrator ,etc. is a kind of water treatment equipment widely used in municipal sewage treatment projects and industrial industries such as petrochemical, light industry, chemical fiber, paper making, pharmaceutical, leather and so on. In the early days, the screw filter was blocked because of the filter structure. With the development of spiral filtration technology, a relatively new filter structure appeared. The prototype of spiral filter equipment with dynamic and fixed ring filter structure — the cascade spiral sludge dehydrator began to be launched, which can well avoid the problems caused by the blockage, and therefore began to be promoted. The spiral sludge dehydrator has been widely used in many fields because of its characteristics of easy separation and non-clogging.