This high-precision fully automatic intermittent EPS pre-expander is the core equipment for EPS foam product production lines, specially designed for the pre-expansion process of expandable polystyrene (EPS) beads. Adopting a PLC automatic control system, it realizes fully automatic operation of the whole process including feeding, weighing, steam heating, expansion, discharging and cooling. With high precision in foam density control and excellent bead uniformity, it effectively reduces steam consumption while improving production efficiency and product consistency. The machine features a robust and durable structure, easy operation and maintenance, and is widely used in the production of EPS products such as packaging foams, building insulation boards and foam sheets, meeting the quality requirements of foam raw materials in different industries.