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Closed loop control system for diamond core drilling

  • US 6,186,248 B1
  • Filed: 10/22/1998
  • Issued: 02/13/2001
  • Est. Priority Date: 12/12/1995
  • Status: Expired due to Term
First Claim
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1. A control system for controlling operation of a core drilling device, the core drilling device including a drive system to advance and retract a drill string carrying a drill bit, the control system comprising:

  • a first sensor in communication with the core drilling device, the first sensor being operative to sense a weight on the drill bit during a pull-down mode of operation, and to generate a corresponding first signal;

    a second sensor in communication with the core drilling device, the second sensor being operative to sense the weight on the drill bit during a hold-back mode of operation, and to generate a corresponding second signal; and

    a controller in electrical communication with the respective sensors and with the drive system, the controller being programmed with a preselected maximum value for the weight on the drill bit, wherein the controller is responsive to one of the signals having a value above the respective maximum value to control the drive system to reduce the rate of penetration of the drill bit.

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