An Adaptive Die for Blow Molding Machine

Abstract

The invention discloses an adaptive die head for a blow molding machine, which belongs to the technical field of blow molding machines, and comprises a die head and a core interspersed in the die head. There is a hydraulic cylinder for driving the core to move up and down. The piston rod of the hydraulic cylinder is fixedly sleeved with a rod sleeve. The extrusion pipeline between the machine head and the extruder is connected with a telescopic adjustment tube. There is a multi-level adjustment mechanism between them. In the present invention, by setting rod sleeves, regulating tubes and multi-stage regulating mechanisms, during the process of increasing or reducing the die gap, the multi-stage regulating mechanism can compress or stretch the regulating pipes to increase or reduce the output of the die gap in a short time. Quantity, so as to avoid the problem of unstable laminar flow and weld line caused by insufficient or excessive short-term extrusion due to the instantaneous increase or decrease of the die gap, and finally improve the quality of the plastic parison and improve the blow molding effect.

Description

technical field [0001] The invention relates to an adaptive die head for a blow molding machine, which belongs to the technical field of blow molding machines. Background technique [0002] Blow molding, also known as hollow blow molding, is a plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot or heated to a softened state. After the mold is closed, compressed air is injected into the parison immediately to make the plastic parison inflated. Closely attached to the inner wall of the mold, after cooling and demoulding, various hollow products can be obtained. [0003] As the geometry of hollow blow molding products becomes more and more complex, and considering that the tubular plastic parison will stretch under the influence of its own weight, a parison wall thickness control system is often installed on the blow molding machine die head to dynamically adjust the ...

AI Technical Summary

Problems solved by technology

When the existing blow molding machine die head adjusts the die head gap and changes the thickness of the extruded tubular parison, the extruding speed of the screw rod of the extruder cannot be adaptively changed dynamically, resulting in the speed of extruding the parison from the die head. Repeated and rapid changes will easily cause unstable laminar flow on the surface of the extruded parison, and weld lines will appear, which will affect the quality of the parison

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