Size detection device for air production box of safety air bag

The utility model discloses a device for detecting the size of an air generating box of a safety air bag, which comprises a conveyor belt and a positioning plate, one side of the positioning plate extends to be provided with a fixing part, the fixing part is fixedly connected with the edge of the conveyor belt, the positioning plate is provided with a positioning groove, the positioning groove is of a U-shaped structure, and the positioning plate is suspended above the conveyor belt. Openings of the positioning grooves face the advancing direction of the conveying belt. A first sensor group, a second sensor group and a third sensor group are arranged on the conveying belt, and the first sensor group is used for measuring the height of the safety airbag gas production box; measuring the diameter of the upper shell of the airbag gas production box by using a second sensor group; and a third sensor group is used for measuring the diameter of the lower shell of the airbag gas production box. According to the util