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Abstract
The purpose of our investigation was to estimate the main stresses the melter is exposed to, to analyse their factors and to propose technical solutions likely to reduce them. The three stages of the research which encompassed four years, are the following ones:
1. A diagnostic stage: intended to identify the principal sources of stress, further to quantify them in order to determine a priority for the second stage. The analysis of the working conditions was performed in terms of equivalent circulatory strain. The continuous telemetry of the heart rate was used as method for measuring this strain in practice and proved to be the most practical procedure for assessing the muscular work stress.
2. A therapeutic stage: during which the main technical and organisational solutions were to be figured out in order to reduce the physiological load without altering the production, qualitatively or quantitatively.
3. A stage of implementation and control: aiming at putting the technical solutions to work and controlling their efficiency.
The realised technical improvements (reduction of runners length, covering of the runners ) achieved a reduction of the thermal stress due to radiation of the liquid pig iron as well as the motor stress which is mainly function of the pig iron production. Other effects such as reduction of the number of minor and serious accidents accompany the technical improvements.
Notes
*This study was undertaken with the financial support of the European Communities.