Spiral electromagnetic sensor-based device for measuring bubble(s) in molten metal

Abstract

The invention provides a spiral electromagnetic sensor-based device for measuring bubble(s) in molten metal. The device comprises an upstream electromagnetic sensor, a downstream electromagnetic sensor, a front end plate, a signal processing module and a host computer; and each of the upstream sensor and the downstream sensor includes an excitation coil and a detection coil, and the sensors are coaxially wound around the surface of a measured pipeline. The measuring device has the following steps: the measuring device utilizes the special spiral structure of the sensors to obtain a consistent and uniform sensitive field of a whole measured area; the device can detect a large-sized single bubble (with radius rb being more than r / 20) having a regular shape or a small bubble group in the molten metal with the caliber r being 0.1-1 m; the device and extract bubble parameter related quantitative information from a detection signal, and further derives the motion parameters of the bubble(s); and the device has a good real-time property, the working frequency can reach 10 MHz, and continuous acquisition of completely independent data points in the sampling process is guaranteed.

Description

technical field [0001] The invention belongs to the electromagnetic non-destructive testing technology, in particular to a bubble measuring device in molten metal based on a spiral electromagnetic sensor. Background technique [0002] The measurement of bubble parameters in molten metal has always been a difficult point in industrial measurement. For some industrial processes, such as the production of foamed aluminum, air bubbles in the metal melt are an important factor affecting product quality. In the production process of some metals or alloys, if the non-metallic inclusions (such as air bubbles) cannot be effectively controlled, it will not only affect the forming process of the product, but also greatly endanger the service performance of the metal material. Because the metal liquid has the characteristics of high temperature and opacity, and some liquids are corrosive to a certain extent, it is difficult to measure. For traditional contact measurement methods, on t...

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Problems solved by technology

For traditional contact measurement methods, on the one hand, it is necessary to make high-temperature and corrosion-resistant probes or electrodes with high cost; on the other hand, these contact sensors may change the distribution of the measured object field or the physical and chemical properties of the molten metal chemical nature, causing metal fluids to be contaminated

[0003] For non-contact measurement methods, ultrasonic testing and optical testing need to make special probes, which are expensive; in addition, the propagation speed of ultrasonic waves and light is affected by the physical properties of the medium, and the accuracy of measurement is difficult to guarantee

The electrical non-contact measurement method can realize low-cost and non-invasive measurement, but due to the "soft field" characteristic of the measurement system itself, the measurement sensitivity is low and the measurement is severely uneven

In the field close to the sensor, the measurement accuracy is high; in the center of the field, it is difficult to obtain a measurement value with a large amplitude

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