摘要 |
The invention relates to the automatic control of the lifting travel of a string of pipes suspended from a cable. To stop this string of pipes systematically in a specific position, a first passage check controlled by a sensor, for example sensitive to the rotation of the pulley over which the cable passes, is associated with a second location check controlled by a sensor, for example sensitive to the passage at a given level of the joints separating the pipes two by two.
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