A double-wire separation resistive molten metal liquid level sensor

Abstract

The invention discloses a twin-wire separation resistance type molten metal liquid level sensor and belongs to the technical field of sensors. The sensor is used in the detection of a molten metal liquid level in a closed, high-temperature and high-pressure environment. According to the twin-wire separation resistance type molten metal liquid level sensor, an Ni18Cr20 resistance wire is adopted, the resistance wire is divided into the outer resistance wire and the inner resistance wire, the outer resistance wire is a working resistance wire, and the inner resistance wire is a temperature compensation resistance wire. The outer resistance wire is wrapped with ceramic fiber paper and loaded in a corundum ring to configure an adhesion removing device, the corundum ring floats in a high-temperature molten metal solution, and the corundum ring is soaked in the high-temperature molten metal solution when in working; the temperature compensation resistance wire serves as a contrast, the influence of temperature change on sensor measurement results can be effectively reduced, the temperature compensation resistance wire is packaged in the corundum ring, the resistance wire can be effectively protected and the service life of the resistance wire is improved. The molten metal liquid level sensor has the advantages of being in high in measurement accuracy, large in measurement range, low in cost and long in service life.

Description

technical field [0001] The invention relates to the technical field of sensing and detection, in particular to a double-wire separation resistance type molten metal liquid level sensor. Background technique [0002] Liquid level measurement belongs to the general research field and has a long application history. Various types of liquid level sensors developed based on different principles have been widely used. However, the molten metal liquid level sensor works in a high temperature environment, which can easily lead to a series of problems such as material corrosion, noise interference, oxidation, etc. Therefore, the development of high temperature molten metal liquid level sensors puts forward higher requirements for sensor materials and system stability. Its long life and accuracy are relatively complicated issues, and the design and development of high-temperature molten metal liquid level sensors has always been a difficult point in the field of liquid level measureme...

AI Technical Summary

Problems solved by technology

But for high-temperature molten metals, which are smelted in airtight containers, direct detection becomes very difficult

At present, in the aspect of measuring the liquid level of high-temperature molten metal, the test method of artificial probe rod is mainly used. The labor intensity of the operator is high, the efficiency is low, the reliability of data collection is poor, and it is difficult to realize automation.

Float-type liquid level sensors are also used in some occasions, but the requirements for the float material are high, and the float is exposed to high-temperature melt for a long time, which is easy to corrode, resulting in a high failure rate and inconvenient use

[0004] Invention patent CN 103017859A discloses "a contact-type high-temperature molten metal liquid level height measuring device". The measuring device uses an ultrasonic liquid level sensor to measure the high-temperature molten metal liquid level. The impact of the measurement results in low measurement accuracy and cannot work for a long time

In the document "Design and Research of Pouring Control System Based on CCD Image Sensing" ("Journal of Kunming University of Science and Technology", 2005-3-15), it is proposed to use high-speed laser CCD liquid level sensor to measure molten metal liquid in industrial production process The depth is high, but the cost is high, especially the measurable range is small, and the application range is limited; the thermocouple point liquid level sensor has high accuracy, but the measurement value is discrete, which cannot adapt to high-precision applications.

[0005] At present, the molten metal liquid level sensor used in the airtight, high temperature and high pressure environment cannot meet the production requirements of automation and measurement accuracy on the one hand, and on the other hand, due to its single function and high cost, it is urgent to develop a long-life, Low-cost, high-precision sensor for molten metal level measurement

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