Control method and device for metering screw, controller and metering screw

Abstract

The embodiment of the invention provides a control method and device for a metering screw, a controller and the metering screw. The control method for the metering screw comprises the steps that a precise weighing flow setting value, a precise weighing flow recording value, a metering error recording value and a precise weighing flow setting interval for precise weighing flow self-setting of the metering screw are initialized; according to the fine weighing flow setting value, the fine weighing flow recording value, the metering error recording value and the fine weighing flow setting interval, fine weighing flow self-setting is carried out on the metering screw, so that a target setting value of the fine weighing flow of the metering screw is obtained; and performing flow closed-loop control on the metering screw according to the target setting value. According to the embodiment of the invention, the optimal precise weighing flow setting value can be automatically matched, the metering precision is improved, the frequency of the metering screw is adjusted in real time, the flow is kept stable, metering errors caused by fall fluctuation are solved, the production quality of products is ensured, and economic losses caused by metering reasons are avoided.

Description

technical field [0001] The invention relates to the technical field of metering control, in particular to a control method and device for a metering screw, a controller and a metering screw. Background technique [0002] At present, the measurement of screw machines generally adopts frequency conversion control based on weight control algorithm. When the weighing feedback value reaches the accurate measurement range, the measurement control is performed by switching the low-speed frequency of the measurement screw. The frequency is fixed, open-loop control, and the flow drop is unstable, which is easy to cause drop fluctuations. , resulting in measurement errors. When the measurement starts, the measurement screw runs at high-speed frequency. When the feedback value of the load cell reaches the accurate measurement range, the measurement screw switches to low-speed frequency operation. The frequency of the measurement screw decreases, the flow rate decreases, and the measure...

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Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a control method and device, a controller, and a metering screw for a metering screw, so as to solve the problem that the accurate metering of the current metering screw is based on a fixed low-speed frequency, and cannot dynamically track the change of the metering head, so that the metering head fluctuates. As well as the aforementioned technical problems of the spiral metering open-loop control, the metering accuracy cannot achieve a stable effect

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