Cement raw meal mill automatic control method and control device

Abstract

The invention relates to an automatic control method of a mill during the production process of cement and a device thereof. The method is that: a program controller is adopted to control a plurality of links of material powder preparation; a milling sound monitoring instrument is used for monitoring the milling sound change during operation, a dust collector fan inverter is used for controlling the rotating speed, instrument used for detecting the wind pressure in the mill outputs wind pressure signals to the program controller, a controller is used for controlling fan frequency conversion, an inverter is used by a powder-choosing machine for controlling the rotating speed of a rotor of the powder-choosing machine and the program controller adjusts the rotor frequency conversion of the powder-choosing machine according to the input data; a hot blast stove is arranged in front of the mill to raise temperature in the mill and cause water content of the materials to be evaporated in the mill, a thermocouple is applied at the hot wind inlet in front of the mill to monitoring the temperature of the hot wind entering the mill and leading the temperature to rise to a standard that can evaporate water content of the materials in the mill. The invention has the advantages of simple structure, reliable operation, high testing precision, the running of the mill being timely and accurately monitored by operators in a control chamber, thus realizing manual monitoring, reducing labor intensity of workers, increasing output and reducing power consumption.

Description

technical field [0001] The invention relates to a mill automatic control method and a control device in the cement production process. The invention belongs to the technical field of cement building materials. Background technique [0002] The automatic control method of the mill in the cement production process is a major difficulty in the cement production process. The current mill control method is mainly manual control. Workers adjust the output of the mill based on experience and feeling according to the different grinding sounds of the mill. [0003] The main process of raw material powder preparation in cement enterprises is: after various raw materials are ground and pulverized, they are mixed together according to a certain ratio, and enter the mill from the feed port at the front end of the mill; (if the moisture content of the material is relatively high, it will affect the output of the mill , it is necessary to add a drying mill or other drying devices such as...

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Problems solved by technology

[0004] Therefore, there are many steps in the preparation of powder. After manual control, the mill will be full for a while (that is, there are too many materials in the mill), and then it will be empty for a while (that is, there are too few materials in the mill), which seriously affects the output of the mill; In order to prevent the mill from spitting out (blocking the grinding port), the feeding amount of the mill must be reduced; when the mill is empty, the steel balls in the mill will collide with each other, which will reduce the durability of the steel balls and cause serious economic losses; The steel ball is damaged, and the broken steel ball fragments are ground by other steel balls in the mill to become steel balls (the output of the mill is even lower); after the fine steel balls enter the separator, they will damage the inner wall of the separator. Cause huge wear and tear, greatly reduce the service life of the powder classifier, and seriously cause mechanical damage and major economic losses

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