The utility model relates to a parison length detection device for a blow molding machine. The blow molding machine comprises an extrusion parison die head for extruding a parison and a pair of molding molds for cooling and shaping the parison. The parison length detection device comprises a detection sensor arranged below the extrusion parison die head, with a set distance from the parison extrusion port of the extrusion parison die head. The detection sensor comprises a light emitter emitting outgoing light and a light receiver receiving reflected light. The optical axis directions of the light emitter and the light receiver intersect and are perpendicular to the parison extrusion direction. The detection sensor is in signal connection with at least one of the molding molds. The device detects the extrusion length of the parison, proposing a closed-loop control mode for the blow molding machine to ensure a constant parison length, thereby preventing excessive parison from producing flash waste, saving production costs and reducing processing difficulty.
Area Code: CN
Application Number: CN201520620212.X
