Device and method for controlling temperature of plastic melting barrel of injection molding machine or extruder

Abstract

The invention discloses a device and a method for controlling the temperature of a plastic melting barrel of an injection molding machine or an extruder. The controlling device comprises the plastic melting barrel and a housing body outside the plastic melting barrel, wherein a cavity is jointly defined by the plastic melting barrel and the housing body; an air outlet or an air inlet of a fan is communicated with the cavity. A driving motor of the fan is a common alternating-current motor or a servo motor, wherein the common alternating-current motor is connected with a frequency converter which is connected with a central controller, or the servo motor is connected with a servo driver which is connected with the central controller. The plastic melting barrel is provided with a temperature sensor which is connected with the central controller. In work, the work temperature of the plastic melting barrel is acquired by the temperature sensor; when the work temperature exceeds preset temperature, the central controller gives out a control instruction, the rotation speed of the common alternating-current motor is controlled by virtue of the frequency converter, or the rotation speed of the servo motor is controlled by virtue of the servo driver, so that the flow of the fan is controlled. The controlling device is simple and reasonable in structure, flexible in operation, high in accuracy of injection molding or extrusion molding, and especially applicable to processing of precise products.

Description

technical field [0001] The invention relates to a control device and a control method for an injection molding machine or an extruder melt cylinder. Background technique [0002] The current building materials market uses a large number of plastic products, especially UPVC pipe fittings, including UPVC pipes and pipe joints. UPVC pipes are produced by extruders, and UPVC pipe joints are produced by injection molding machines. Due to the characteristics of UPVC material itself, during molding production, the temperature of the melt cylinder will gradually increase due to the shearing action between the screw and UPVC material. The traditional method is to use a fixed-speed motor fan. When the temperature of the melt cylinder rises The fan works after exceeding the set value to a certain extent, and the fan stops working when the temperature of the melt cylinder drops to a certain temperature. This control method can control the temperature of the melt cylinder within a certa...

AI Technical Summary

Problems solved by technology

Due to the characteristics of UPVC material itself, during molding production, the temperature of the melt cylinder will gradually increase due to the shearing action between the screw and UPVC material. The traditional method is to use a fixed-speed motor fan. When the temperature of the melt cylinder rises The fan works after exceeding the set value to a certain extent, and the fan stops working when the temperature of the melt cylinder drops to a certain temperature. This control method can control the temperature of the melt cylinder within a certain range, but because the flow rate of the fan is not adjustable, the temperature deviation Larger, unable to achieve precise control

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