Teaching experimental apparatus for control of ultrasonic level

Abstract

The invention discloses a teaching experimental apparatus for control of an ultrasonic level. The teaching experimental apparatus comprises a controlled object, an ultrasonic level meter, an upper computer, and a system power branch consisting of a frequency converter and a centrifugal blower; each part of an ultrasonic level control system communicates through a foundation field (FF) bus; and the configuration and system monitoring of the bus are completed by the upper computer. According to the teaching experimental apparatus, the non-contact measurement and FF bus technology of the level control system are combined, and the liquid level measurement in the conventional level experimental apparatus is replaced with the level height measurement of a floating body blown by air, so that the water-getting and waterproofing problems in the liquid level measurement are avoided; meanwhile, the floating body changes obviously in position, so that students can understand the operating principle and process of a single-loop closed-loop control system easily in the teaching experiment and also gain a preliminary recognition and understanding for the use of a modern field bus applied to a process automation system; and furthermore, the teaching experimental apparatus for the control of the ultrasonic level is easy to maintain.

Description

technical field [0001] The invention relates to the technical field of teaching experiment demonstration instruments, in particular to an experimental teaching device for ultrasonic level control for teaching. Background technique [0002] In modern industrial production automation, material level is one of the important process parameters, and the measurement and control of material level is an important task to realize industrial production automation. In the industrial production process, the material level generally refers to the liquid level, solid particle and powder particle level, and the liquid-liquid, liquid-solid phase interface position. The one that measures the position of the liquid level is called a liquid level gauge, the one that measures the position of solids and powders is called a level gauge, and the one that measures the position of the liquid-liquid, liquid-solid phase interface is called a phase interface gauge. [0003] In view of the fact that th...

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Problems solved by technology

[0006] The purpose of the invention is to provide an ultrasonic level control experimental teaching device for the shortcomings of the existing process control course teaching experimental device and the high maintenance cost of the traditional experimental device, which realizes the non-contact measurement of the material level control Combined with FF bus technology, the structure is reasonable, the working process of the single-loop level control system is intuitively displayed, and the safety hazards in the experiment are reduced, the operation is simple, and the maintenance cost is low

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