Melt pump is installed between extruder and die to stabilize the pressure fluctuations at the outlet of the extruder, provide a stable delivery flow for the die, and provide the dimensional accuracy of plastic products. It is mainly used in PP, PE, PET, PC, ABS, PA, EVA and other sheets, plates, films, granulation and other fields; Gear pump installed at the bottom of the reactor or pipeline, mainly used to transport the medium and high viscosity medium of the vacuum reactor, suction port adopts large flange design can smoothly suck high-viscosity media under vacuum conditions. It has good self-priming performance. It can be used in vacuum reaction conditions and the stable transportation and pressurization of polymer materials in pipelines. It is mainly used in PET, PLA, ABS, PC, PS, PP, hot melt adhesives, asphalt, grease, adhesive polyols and other non-particulate impurities transportation. The screen changer is a filtering device that filters the impurities of the recycled materi