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DEVICE FOR MEASURING A LOAD AT THE END OF A ROPE WRAPPED OVER A ROD

  • US 20100010714A1
  • Filed: 09/13/2009
  • Published: 01/14/2010
  • Est. Priority Date: 05/19/2006
  • Status: Active Grant
First Claim
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1. A method, for a shovel including a base, a dipper, a boom pivotally mounted on the base, a hoist rope extending from the base to the dipper and wrapped over a sheave mounted on the end of the boom, and a dipper arm supported the dipper on the end thereof, the dipper arm being pivotally mounted on the boom, the method automatically recalibrating dipper position information, a arm resolver mounted on the boom and responsive to record arm extension and retraction, the arm length being equal to a arm offset plus a arm gain times said arm resolver reading, the method automatically recalibrating dipper position information, the method including the steps of:

  • storing the maximum values of the crowd resolver,using the known length of the arm at the maximum extension positions, calculate the offset value for each resolver maximum value,obtaining an array of readings from the crowd resolver to calculate an array of calculated rope wrap angles,obtaining an array of rope wrap angles from another device for measuring the rope wrap angles, andselecting a crowd length offset that minimizes the difference between the two sets of calculations.

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