| 摘要 |
An electromechanical level measuring device (10) comprises a cable drum (16) which is driven by an electric motor (52) and onto which a measuring cable (18) is wound. Attached to the unwound length of the measuring cable (18) is a sensing weight (22). The unwound end of the measuring cable (18) when the sensing weight encounters the surface of the charge is a measure of the filling level. The electric motor (52) drives, via a gear system (48), a shaft (44) which carries a drive wheel (40). The drive wheel can be rotated through a limited angular range between two end positions (64, 66) with respect to a carrier wheel (32). With the sensing weight (22) freely suspended on the measuring cable (18), the carrier wheel is in one end position with respect to the drive wheel. When the sensing weight (22) encounters the charge surface, the carrier wheel is moved in the direction of the other end position by a tension force. The relative rotation of drive and carrier wheel, which are disposed outside the region which can be affected by the charge, is measured by sensors (70, 72) which function without contact and is processed in an evaluation device for switching the direction of rotation of the electric motor (52). <IMAGE>
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