Automatic control method of mold temperature in rotational molding process

Abstract

The invention discloses an automatic control method of mold temperature in a rotational molding process, which is characterized in that an infrared temperature sensor is used for monitoring the surface temperature of a rotational molding mold, an electric actuation mechanism which is installed on a gas pipeline is used for controlling the gas flow, so that the rotational molding temperature can be automatically controlled. Through a servo motor which is installed on a rotational molding machine, a support which is provided with the infrared temperature sensor is driven by a lead screw to move back and forth, the temperature of the rotational molding mold in the axial direction can be measured, a temperature signal is inputted to an industrial control computer after being processed, a temperature chromaticity of the rotational molding mold body and a two-dimensional temperature distribution histogram are generated, a temperature difference signal is converted to a corresponding flow signal through a signal processing module according to the difference between a temperature monitoring value and a given temperature value, the electrical actuation mechanism on the corresponding pipeline is controlled to adjust the openness of a valve so as to control the gas flow, so that the closed-loop control of the temperature in the rotational molding process can be realized. Due to the adoption of the automatic control method, the labor intensity is greatly alleviated, the precision is improved, and the automatic control on the temperature in the rotational molding process can be realized according to the rotational molding requirement.

Description

technical field [0001] The present invention relates to a method of temperature monitoring and control, especially a method of using infrared monitoring principle to monitor the temperature of rotomolding mould, and using an electric actuator on the gas pipeline to control the flow of gas and then control the temperature, specifically a method Automatic control method of mold temperature in rotational molding process. technical background [0002] Rotational molding technology is suitable for processing large-sized hollow products, and has a very broad application prospect. Temperature is the main factor affecting the rotational molding process. Under certain conditions of rotational molding equipment structure, mold structure and polymer raw materials, rotational molding The molding temperature parameter has a direct impact on the quality of the product, so the automatic control of the temperature in the rotational molding process has become the focus of attention...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to design an automatic monitoring method using an infrared scanner to solve the problems that the surface temperature of the direct-fired rotomolding mold mainly relies on manual measurement, and the manual adjustment of the gas flow causes the problems of low temperature control accuracy and lagging response in the existing rotomolding process. The axial temperature on the surface of the rotomolding mold, and the automatic control method of the mold temperature in the rotomolding process by using the electric actuator on the gas pipeline to control the gas flow and then control the temperature

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