In this paper a PLC control system is designed to control the sorting, transmission and loading/unloading in the manufacturing, in view of the defects of the relay control system which usually has poor reliability and bad flexibility in use. On the basis of the superior performance of PLC control system and the working principle of frequency converter, AC transducer drive technology is applied to achieve stable starting, reliable operation and low breakdown rate in the assembly line of manufacturing. In the design of the upper monitoring system, the functions of parameter settings, process monitoring and control, data processing, fault location can be well implemented via configuration software. The research work of this paper will lay a solid foundation for the design of material automatic sorting system based on the PLC controller.
Nano-zirconia (Nano-ZrO2) has good natural color, high strength, high toughness, high chemical stability, excellent corrosion resistance and resistant to chemical attack and microbial erosion particularly, which is one of the biocompatible inert materials and is widely used in biology, medicine and other fields. There are cubic (c-ZrO2), tetragonal (t-ZrO2) and monoclinic (m-ZrO2) phase three different crystal structures of zirconia (ZrO2) in normal atmosphere and different temperatures. In the three different crystal structures, t-ZrO2 has the best performance for ceramic dental materials. However, ZrO2 is usually in the form of m-ZrO2 at room temperature. So to study the synthesis and stabilization methods at room temperature of nano-t-ZrO2 is very important in scientific significance and application prospects.
This paper mainly introduces the principle of preparation for nano-materials via vapor-phase technics, the design and assembly of nano-material synthesizer. Vapor-phase techniques include physical and chemical vapor synthesis, which involves vapor particle nucleation, nuclei growth, cohesion and a series of basic process in particle growth. Based on the principle of vapor-phase, this paper also details the invention of the process equipment for nano-material synthesis, which realizes an adjustable process in automatic control. The design aims to achieve a synthesizer being adjustable, automatic, intuitive and easy to operate. It mainly includes the following features. First, the invention helps show that preparation for nano-materials via vapor-phase technics is feasible. Second, with the high output of vapor-phase reaction, the synthesizer can not only be carried out in the experimental environment to demonstrate the synthesis of nano-materials, but also be applied in industrial production.
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