| 摘要 |
An improved ton-mile recorder for accurately measuring the work done by a cable of a drawworks system. Analog signals representing weight applied to the cable and pulse signals representative of cable movement are integrated electronically to provide electrical gate pulse signals that represent work done by the cable. A high degree of accuracy of the resulting work indicating pulse signals is accomplished by synchronizing a gate pulse of predetermined duration with a pulse train, the frequency of which is representative of weight applied to the cable. A proximity detector is employed to detect the various evenly spaced bolts of a bolt circle of the typical drawworks clutch which rotates along with the cable drum. As each bolt passes the proximity detector, a pulse signal is transmitted which indicates a segment of drum movement and thus a segment of cable movement.
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