Flat parsion shaping mechanism of plastic hollow shaping device

Abstract

The invention relates to a parison molding mechanism of a plastic hollow molding machine, which belongs to the technical field of hollow plastic molding machines. The mechanism comprises a molding machine head, material storage devices for feeding molten plastic into the molding machine head and extruding the molten plastic outside the molding machine head to form a parison, and a parison wall thickness control device for controlling the thickness of the wall of the parison, wherein the molding machine head has a flat and rectangular structure; the pair of material storage devices is correspondingly arranged on the upper part of the molding machine head and is connected and communicated with the molding machine head; and the parison wall thickness control device is arranged on the upper part of the molding machine head, positioned between the pair of material storage device and linked with the molding machine head. The mechanism has the advantages of forming flat parisons, reducing mold opening and closing travels of a molding mechanism of the plastic hollow molding machine, providing a technical guarantee of improved processing efficiency and energy conservation, ensuring the uniform wall thickness of finally molded hollow plastic products, and saving space.

Description

technical field [0001] The invention belongs to the technical field of hollow plastic molding machines, and in particular relates to a flat parison forming mechanism of a plastic hollow molding machine, which is used for storing molten plastic and forming the stored molten plastic into a flat parison and extruding it into the plastic hollow molding machine. The molding mechanism takes shape. Background technique [0002] The parisons formed by the parison forming mechanism of the plastic hollow molding machine in the prior art are all cylindrical structures, and when used to produce large flat hollow blow molding products such as cutlery trays, tabletop panels and even inner wall panels and packaging panels for vehicles , Plastic blow molding trays, flat water tanks and other products, it is necessary to expand the cylindrical plastic parison, so a parison expansion device must be equipped. The concept of expansion mentioned here refers to: flattening the cylindrical plasti...

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Problems solved by technology

The concept of expansion mentioned here refers to: flattening the cylindrical plastic parison into a flat shape (flat body), and in the process of processing the cylindrical plastic parison into a flat shape, there will undoubtedly be The following technical problems arise: one is that the mold consisting of a pair of half molds as a forming mechanism has a large movement range, that is to say, the movement stroke of the mold opening and closing is large for each processing, resulting in prolonged processing time and low operating efficiency; The second is that the complete set of plastic hollow molding machine consumes a lot of energy, which is contrary to the spirit of saving and energy-saving economy advocated at present; It is often impossible to make the mold and the parison body contact at the same time as a whole, so that the parts that are in contact with the mold are cooled first, so that the wall thickness of the flat body or flat product is uneven, and the qualified rate of the finished product is low; the fourth is the cylindrical structure. The machine head is large in size and heavy in weight, difficult to process and high in manufacturing cost

[0003] In view of the above, both the manufacturers of plastic hollow products and the manufacturers of plastic hollow molding machines are actively exploring to solve the aforementioned problems. To this end, the applicant searched, but from the currently published documents (including patent documents and There is no corresponding technical enlightenment in professional journals), because the current market conditions mostly rely on imports for some flat plastic hollow products with large specifications and sizes, so the applicant believes that from the perspective of industrial autonomy, it is necessary to innovate, The technical solution to be introduced below is based on this background

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