The screen changer is the core equipment for the production line of plastic steel strapping to realize efficient, stable and low-cost production. During the production of strapping, there may be some impurities in the plastic melt, such as incompletely melted plastic particles, dust, etc. The automatic screen changer can effectively filter out these impurities for the subsequent molding of strapping. The automatic screen changer can effectively filter out these impurities and provide clean, impu