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Dust control apparatus with cleaning control circuit

  • US 4,384,874 A
  • Filed: 04/10/1981
  • Issued: 05/24/1983
  • Est. Priority Date: 04/10/1981
  • Status: Expired due to Fees
First Claim
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1. Dust control apparatus comprising means for collecting dust as it is being formed by a drill adjacent an associated bore hole, means for receiving dust from said dust collecting means, said dust receiving means including a chamber, filter means in said chamber for collecting dust received therein, air pressure means connected to said filter means for delivering air pressure to said filter means for cleaning the dust therefrom, circuit means for selectively controlling the sequential operation of said air pressure means to deliver same to the filter means at predetermined intervals to clean the dust therefrom at such predetermined intervals, discharge means for removing dust from said chamber, said filter means comprising a plurality of filters positioned in said chamber, said apparatus further including an electronically controlled valve positioned and arranged between each of said filters and said air pressure means for delivering air pressure from said air pressure means to each of said filters, said circuit means including oscillator means for developing spaced predetermined pulses, said circuit means further including counter means receiving said predetermined pulses and developing reoccurring groups of coded pulses corresponding in number to the plurality of filters, said circuit means also including decoder means for developing a single output drive pulse from each group of coded pulses corresponding to the particular filter to be cleaned, and said circuit means including means for delivering each particular output drive pulse to one of said electronically controlled valves for delivering air pressure from said air pressure means to one of said filters, said circuit means including timing means for developing on-time pulses each of a predetermined duration, said circuit means including means for controlling the delivery time of the output drive pulse and said circuit means further including means for varying the spacing between each of said on-time pulses in relation to the pressure supplied by said pressure means.

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