一种常压橡胶挤出机的预硫化箱,将预硫化箱顶部设有盖的凹槽体,设置在橡胶挤出机与硫化烘箱之间,在预硫化箱的四壁安装红外线辐射器。本实用新型具有以下优点:①橡胶制品悬空通过预硫化箱,不会产生压痕;②橡胶制品通过预硫化 A pre-vulcanization chamber of an atmospheric rubber extruder, a groove body with a cap on the top of the pre-vulcanization chamber is arranged between the rubber extruder and the vulcanization oven, and an infrared radiator is arranged on the four walls of the pre-vulcanization chamber. The utility model has the following advantages: (1) the rubber product is suspended through the pre-vulcanization tank without indentation; (2) the rubber product is pre-vulcanized