Structure for driving mold rotation in multi-color injection molding machine

Abstract

The invention relates to a structure to drive a mould to rotate inside a double-color or multicolor injection molding machine. The invention comprises a moving platen and a rotor shaft. The rotor shaft passes through the moving platen movably. A plurality of guide straight channels are arranged at an interval in the axial direction on the rotor shaft. Two adjacent guide straight channels are communicated through a spiral groove. The directions of spiral of the spiral grooves are consistent. A plurality of guide pins which can glide relatively inside the guide straight channels and the spiral grooves are relatively fixed on the aft part of the moving platen; and the number of the guide pins is the same with the number of the guide straight channels. The foreheads inside the guide straight channels are provided with walls to guide corresponding guide pins inside corresponding spiral grooves from the guide straight channels. When the rotor shaft moves forward in the axial direction, the rotor shaft can rotate by 180 degrees relative to the moving platen under the mating reaction of the guide pins, the guide straight channels and the spiral grooves so as to drive a mandrel or a turntable to rotate by 180 degrees, and the rotor shaft moves backwards. The rotor shaft moves backwards smoothly and does not rotate under the mating reaction of the guide pins in the guide straight channels to finally change the mould cavity.

Description

technical field [0001] The invention relates to a multi-color injection molding machine, in particular to a structure for driving a mold to rotate in the multi-color injection molding machine. Background technique [0002] In recent years, the design and manufacture of two-color injection molding machines has gradually developed in China. Two-color injection molding products have been widely accepted and used for their beauty, practicality, good hand feeling, and high precision, such as various handles, telephone buttons, automobiles tail lights etc. The core part of the two-color injection molding machine is the rotating structure that drives the mold to rotate 180°. The existing rotating structures mainly include two types: rotary disc type and rotary shaft type. [0003] 1. The rotary structure of the turntable is to add a turntable that can rotate 180° on the movable platen of the injection molding machine. One or two pairs of molds are installed on the turntable, and t...

AI Technical Summary

Problems solved by technology

[0007] It is thought that the structure of the two-color injection molding machine is complex, whether it is a rotary structure of a rotary table or a rotary shaft, they are difficult to have a uniformity, and each specific injection product is injected. The rotary structure of the rotary table cannot produce products produced by the rotary structure of the rotary table, and vice versa. Low resource utilization and high cost

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