B, single screw pump before adding buffer tank in pipeline, the buffering can store a certain amount of crude oil, and a current limiting device for mixture pumps supply a certain amount of crude oil.

New technology and new construction, such as hydraulic coupling, dismountable scraper chain, pneumatic discharge gate valve and screw tensioning device with multi-spring buffer are used.

Idler roller can be divided into groove, parallel to the roller, spherical roller, buffer roller, roller screw, corrosion-resistant roller, vertical roller block;