Compared with the GS type screw conveyor, the head and tail bearings of the LS type screw conveyor are moved to the outside of the shell, the hanging bearing adopts the rolling structure, the pulley bearing is exchanged, and the dust-proof sealing device is installed. Good performance, strong wear resistance, low resistance and long life. Sliding bearing bushes include cast copper tiles that need to be lubricated, alloyed and ground cast iron tiles and copper-based graphite oil-less lubricating tiles. The discharge end is equipped with a cleaning device. The whole machine has low noise, strong adaptability, convenient operation and maintenance, and inlet and outlet ports. The location arrangement is flexible.