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Abstract. Through the combination of expert control and bang-bang control, the circulating fan in cement grinding process equipment is controlled to affect the silo weight of steady flow silo, to realize the stability of silo weight and to improve the production efficiency. Firstly, the correlation between the stability of silo weight and the improvement of production efficiency is introduced, and several conditions affecting the silo weight of steady flow are summarized. Then the control principle and the control algorithm are introduced emphatically. Finally it is proved that the method can stabilize the weight of the steady flow silo by controlling the speed of the circulating fan with matlab to draw the field data into a graph. IntroductionCement industry is the main pillar industry of our national economy. Cement is used not only in industrial and civil construction, but also in transportation, urban construction, agriculture forestry, water conservancy, military, seaport and other new industrial construction projects. And it is the national construction and indispensable important material [1] in people's life. Cement grinding is the end link of cement production, including cement pre-grinding and cement final grinding stage. The improvement of production efficiency in cement pre-grinding stage can reduce the pressure in the subsequent final grinding stage, in order to improve the production efficiency of the whole process of cement grinding.At present, many scholars devote themselves to improving the efficiency of cement grinding. For example, reference [2] is to improve the efficiency of cement grinding by adding grinding aids. In addition, reference [3] provides a method to improve the efficiency of cement grinding by using high-efficiency separator. External force intervention or modification of site equipment is needed in the above methods of improving the efficiency of cement grinding. This paper starts with the control method and improves the production efficiency by controlling the relevant equipment to ensure the stability of the steady flow silo weight, thus improving the production efficiency. In the classical control, before the industrial equipment is controlled, the mathematical model should be established according to the operation of the field equipment, and the corresponding control of the field equipment should be carried out through the model. Due to the long-lag and nonlinear process as well as the difficulties in modeling, this paper adopts a method from the view of control which combines the expert control and the bang-bang control in order to improve the efficiency of cement production.Expert control belongs to the category of intelligent algorithm. In the absence of an accurate model of the system, this method controls the system according to the knowledge base established from the expert experience and the corresponding reasoning machine. As described in reference [4], expert control was successfully used in cement grate cooler system.

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On the basis of traditional hollow blow molding machine head, this paper researches the accumulating corner style machine head. This kind of machine head employs double layers and double spiral flow channels which solve the intensity problem of the large scale blow molding machine with single spiral flow channel on the fusion seam area. His paper researched the technological parameter and structure size based on the structural style.

This paper elaborate the structure of parison wall thickness control system; choice hardware of the control system; study on the determination of the thickness control method and control points of parison wall; research on the formation of the parison wall thickness curve; summed up the development process of extruding plastic machine heating method on the basis of the plastic molding machinery development; analysis the various of heating methods; summed up the advantages and disadvantages of various heating methods; explore their advantages and disadvantages for providing reference.