Clamping devices at edge of substrate glass during molding based on overflow technique and operation methods thereof

An operation method of a clamping device at an edge of a substrate glass during molding based on an overflow technique, wherein the clamping device includes a primary clamping unit and a secondary edge drawing unit, wherein

• the primary clamping unit and the secondary edge drawing unit clamp edges of two sides of a glass plate, respectively,
• the primary clamping unit is arranged above the secondary edge drawing unit, and
• the primary clamping unit is closer to a guide plate than the secondary edge drawing unit, and the operation method comprises:
• during the molding of the glass plate, enabling clamping wheels of the primary clamping unit and wheels for cooling and edge drawing of the secondary edge drawing unit to clamp the edges of the two sides of the glass plate to make liquid glass at the edges merge and bond together to obtain a bonded glass plate;
• and
• introducing cooling air into a cooling air duct to cool edges of the bonded glass plates.