Patent ID: 9180775
Filing Date: 2015-11-10
Classification: B29C,B29L,B60K

Abstract:
1. A molding method of blow-molding a hollow tank body with at least one build-in component, in which the hollow tank body is molded by molding sheet parisons in half molds, including steps of feeding, pre-molding, building-in of component, and molding, characterized in that: in the feeding step, delivering, in parallel, two sheet parisons with curved surface to two clearances respectively; wherein the two clearances are formed by two half molds and a pre-molding template device arranged there-between; wherein the pre-molding template device comprises two template half plates; in the pre-molding step, by coordinated movement of the two half molds and the pre-molding template device, bringing the two half molds into contact with the two template half plates respectively and bringing the two sheet parisons into contact with the two half molds by blow action and/or suck action so as to form the two sheet parisons into two pre-molding parisons; in the building-in of component step, moving the two half molds away from each other, removing the pre-molding template device, placing a build-in mechanism preloaded with a component into the middle of the two half molds using a lifting device, and connecting the component with at least one of the two pre-molding parisons; in the molding step, removing the build-in mechanism using the lifting device, moving the two half molds towards each other, and molding the two pre-molding parisons with the component into a plastic hollow tank body; wherein the pre-molding template device further comprises two base plates for supporting the two template half plates respectively, and expanding mechanism mounted on the two base plates; wherein the expanding mechanism comprises two sets of clamping elements arranged on the two base plates respectively; wherein the coordinated movement of the two half molds and the pre-molding template device comprises the following steps: moving the two base plates to allow the two template half plates to move towards each other and to move to the middle of the two half molds; and simultaneously, moving the expanding mechanism to allow the two sets of clamping elements to move towards each other; when the clamping elements of the expanding mechanism contact edges of the two sheet parisons with the curved surface, the two sets of clamping elements respectively clamp the edges of the two sheet parisons to stretch the two sheet parisons, which are with the curved surface, in opposite directions.