Control method of high-precision metering device and corresponding device

By automatically calculating and adjusting the initial value and rotation speed of the screw in the metering device, and combining the setting of the control amplitude limit value, the problems of metering accuracy and errors in external factors are solved, and higher accuracy and stability are achieved.

CN119189238APending Publication Date: 2024-12-27KAWATA MASCH MFG (SHANGHAI) CO LTD
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Patent Information

Application Number
CN202411610949.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-12
Publication Date
2024-12-27

AI Technical Summary

Technical Problem

Existing metrology devices generally have poor metrology accuracy and large workload in the injection molding and extrusion industries, which are prone to waste of product color difference or color masterbatch, and are easily affected by external factors errors.

Method used

Using a control method of a high-precision metering device, the maximum rotation speed and operation time are set when the metering screw is first turned on or replaced, the initial value is automatically calculated and entered, and the screw is adjusted in real time according to the feedback value of the weighing sensor during automatic operation. The rotation speed is set to control amplitude limit value to prevent fluctuations in the blanking process, and record and save the continuous operation capability of the screw as the initial value for the next startup.

Benefits of technology

It improves the measurement accuracy, prevents errors caused by external factors, shortens the adjustment and stability time, enhances the control accuracy, and ensures the matching degree of the discharge speed and the set value.

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Abstract

The invention relates to a control method of a high-precision metering device, which comprises the following steps of: starting and operating the metering device for the first time or replacing a metering screw rod of the metering device, setting the maximum rotating speed and the operating time of the metering screw rod, automatically calculating the initial value capability of the metering screw rod by the metering device after the metering device is started, and calculating the initial value capability of the metering screw rod after the metering device is started. The initial value capability is automatically recorded into the initial value; when the metering device operates automatically, the initial operation speed of the screw is calculated according to the set required blanking amount and the initial value, and the initial operation speed is calculated according to the feedback value of the weighing sensor in real time; a control amplitude limit value is set by the metering device in the automatic adjusting process, so that blanking fluctuation is prevented; and recording a value with high matching degree between the current blanking speed and the set value, calculating and recording the metering capacity of the screw during continuous operation, and taking the metering capacity as an initial value during next startup. The invention also relates to a corresponding device, and by adopting the method and the device provided by the invention, the regulation stabilization time can be effectively shortened, and the control precision can be improved.
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