Automatic Control Method of Raw Material Grinding

Abstract

The invention discloses a raw material grinding automatic control method. In an automatic state, During amplitude control of a lifting and falling roller, an amplitude scope is tested mainly through observation and lifting and falling operation of a grinding roller is carried out. During control of water pump opening, operation conditions of a material layer thickness and a mill output temperature are integrated, a pid fuzzy control operation method is employed, and the water pump opening value is adjusted to achieve stabilization control effects. During the feed control link, feed quantity is controlled according to a current of a milling machine and a current of a powder selection machine and furthermore the current and the amplitude of the milling machine are stabilized. The problem that parameter adjustment cannot be tracked rapidly in a routine PID is avoided, according to characteristics that fuzzy control is independent from an accurate mathematic model and suitable for non-linear and large time delay production processes, by utilization of fuzzy PID and Bang-Bang control methods, a tracking error convergence speed is quickened, thus the vertical milling control process has a stable dynamic performance, milling machine vibration is reduced, the yield is raised and accurate and rapid control effects are achieved.

Description

technical field [0001] The invention relates to the technical field of cement production, and uses fuzzy PID and Bang-Bang control methods to improve the inability to quickly track and adjust vertical mill production, thereby inventing a practically applicable automatic control method. Background technique [0002] The vertical mill grinding process is a multi-variable, long-time-delayed, strongly coupled, non-linear process. There are many interference factors and multi-variable coupling. It is difficult to establish an accurate system model to describe its changes. This makes it difficult for some control methods to obtain good control effects. For example, conventional PID control cannot quickly adjust to parameter changes, so that the control effect is not good. The present invention mainly controls and adjusts three links: lifting and lowering rollers, water pump opening and feeding amount. In the process of cement production, there are many factors that will affect th...

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Problems solved by technology

[0014] Aiming at the problems of few vertical mill control methods and insufficient control force in the cement production process of the prior art, the purpose of the present invention is to provide a method that avoids the problem of fast tracking parameter adjustment in conventional PID, and does not rely on precise mathematical models according to fuzzy control. Due to the characteristics of nonlinear and long-delay production process, fuzzy PID and Bang-Bang control methods are used to speed up the convergence speed of tracking error, so that the vertical mill control process has stable dynamic performance, thereby reducing mill vibration and increasing production. In order to achieve precise and fast control effect

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