Importance

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Abstract

In strip casting, a melt is pressed between a travelling belt and a casting drum rotating along with the belt. A method and device for measuring the speed difference between the speed of the belt and the peripheral speed of the drum involves providing the belt on one side with a pattern of alternately darker and lighter stripes. Around the periphery of the casting drum there is arranged a number of measuring zones, each having the same width as that of the stripes. Each measuring zone includes a transducer built up of a number of photocells which, via optical conductors opening out to the measuring zones, can be activated by the stripes. When, during a casting operation, a measuring zone has arrived at a given measuring region, the number of activated photocells is read. The same procedure is repeated when the same transducer arrives at the end of the measuring region. With knowledge of the extension of the measuring zone and the measuring region and the number of photocells in each zone, the speed difference, expressed as a percentage, together with the difference in activating photocells, can be calculated.

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First Claim