This is a main device for raw material pre-cooking, blanching, sterilization in the treating production line before dehydration and quick-freezing. This device feed the materials automatically. Electromagnetic motor control speed is adjusted by YCT series of electromagnetic speed controller, constant torque achieve stepless speed regulation. Pre-cooking temperature is in double safe with the digital temperature -regulating and the thermometer straight. Application scope: Pak-choi, vegetables, cabbage, carrots, green concanavalin, garlic stem, taro seeds and so on.