A photoelectric level detection device

Abstract

The invention provides a photoelectric material level detection apparatus mainly comprising a motor, a positioning pin, a spacing point, a fixed bearing, a sealed glass pipe, a measuring conduit, photoelectric switches, a resistance network containing photoelectric switch contacts and an intelligent unit. The measuring conduit with a measuring window is placed in a container; the sealed glass pipe is connected into the measuring conduit; diffuse-reflection type photoelectric switches longitudinally arrayed are placed in the sealed glass pipe; a measuring head of each photoelectric switch is aligned to the measuring window; when the measuring conduit is immersed into the material, the photoelectric switches produce diffusion reflection lights due to the shade of the material, so corresponding photoelectric switches act and resistance value of the resistance network changes; and the resistance value is processed by the intelligent unit and then material level can be acquired. The photoelectric material level detection apparatus can be mainly applied to light particle and powder material level measurement and has an automatic adhering function.

Description

technical field [0001] The invention relates to a device for measuring the height of materials in a container, in particular to a photoelectric level detection device. Background technique [0002] Level detection is to measure the height of the material in the container. The material is generally divided into liquid and solid. The level of liquid is often called liquid level, and the level of solid is also often called material level. At present, the devices used for continuous measurement of solid level mainly include capacitive level gauges, radio frequency admittance level gauges, hammer level gauges, ultrasonic level gauges and radar level gauges. Capacitive level gauges are widely used in practice. Its advantages are low cost and can be used in high temperature and high pressure conditions, but the disadvantages are large temperature drift, difficult calibration and fear of adhesion. The radio frequency admittance level meter is an improvement of the capacitive level ...

AI Technical Summary

Problems solved by technology

The hammer type level meter has many mechanical parts and a large measurement interval, which is not suitable for rapid and continuous measurement, and cannot be used for the measurement of solid dust level

Ultrasonic level gauges and radar level gauges are non-contact level gauges, which are not limited by the corrosivity of the measured material or the shape of the material, and can be widely used to measure the level of various liquids or solids, but they are expensive. The installation is complicated, and the accuracy is easily affected by the environment, so it is difficult to use in the occasions where there are foam, stirring, piping and heating equipment in the container

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