Research And Design Of High Temperature Liquid Metal Viscometer

Viscosity, an important parameter of indicating fluid's property, is of physical of fluid which can directly reflect the properties of different fluids. Thus viscosity measurement has been widely applied to a great number of manufacturing fields of society. For example, some relevant knowledge and data are used in many engineering technologies. With the development of industrial modernization and the advance of scientific technology, more importance is attached to viscosity measurement in related, which contributes to the emergence of newly-development of viscosity measurement. At present the development of viscosity measurement is orientated towards being highly precise, automatic and along on-line due to the inefficiency of instruments and the development of national economy.In this paper we designed a new viscometer, which contain two methods to measure viscosity. The one is oscillating-vessel method, which is used to measure the high-temperature low viscosity liquid metal as the main measured objects, and the another is oscillating method, which is used to measure high viscosity objects. The viscometer combined the advantages of two measurement methods. The viscometer is made up of two components, which are PC host computer system and MCU computer system. The PC host computer system is software parts of the viscometer and the MCU computer system is hardware part of the viscometer. For designing of the viscometer, this paper include the following .Firstly, this paper describes the characteristics of methods for measuring viscosity and presents two schemes of the viscometer. It analyzes the dynamic mode of the oscillating-vessel and two algorithms for the solution of viscosity which are analytical viscosity algorithm and shvidkovskiy viscosity algorithm. The advantages and disadvantages of the two algorithms are presented, and the feasibility of them is explained. It analyzes the theory of the oscillating viscometer, and improves the viscosity calculation method. The new method can achieve high viscosity large scale measurement without changing the hardware of the oscillating-vessel viscometer.Next the hardware structure and SCM software design of the viscometer are presented. It analyzes the whole structure and mechanism of viscometer, and explains the viscometer component briefly. The SCM circuit is designed as follows: MCU is MC9S12DG128 with 16 bit. External circuit contains the key and LED circuit with ZLG7289, laser pulse time detecting circuit, time measurement circuit with ETC module of the SCM, etc. Also the software structure and design is presented.Finally, the software design scheme of viscometer using C++ Builder6.0 is presented. The structure and function of the software, especially the serial communication module, motor control module, viscosity calculation module and chart module of the software are described in detail. Also it presents the software operation flow.Experiments show that the viscometer we designed has high accuracy, wide measurement range and reliability reproducible, and better meet the requirements of the design task. The viscometer can meet as much demand of production as possible and have a promising future by operating all the time and on-line testing automatically. Then summarizes the designing of hardware circuit and software development involved , points out the weak points there are, and prospects for the future.