| 摘要 |
Sieve screen level sensing in a filtering apparatus ( 10 ) for filtering fine powder material (M) which includes a sieve ( 12 ) having a material inlet ( 24 ) and a material outlet ( 26 ), and a sieve screen ( 14 ) is disposed within the sieve ( 12 ) between the material inlet ( 24 ) and outlet ( 26 ) such that the material (M) must pass through the sieve screen ( 14 ) to enter the material outlet ( 26 ) and thereby exit the sieve ( 12 ). An input valve ( 22 ) controls the flow of material (M) into the sieve ( 12 ) through the material inlet ( 24 ). A sieve screen level sensor assembly ( 20 ) senses a level of material (M) accumulated upon the sieve screen ( 14 ), and issues a level sense signal ( 66 ) indicative of that level. A programmable logic controller ( 60 ) receives the level sense signal ( 66 ) and controls the inlet valve ( 22 ) dependent at least in part thereon to thereby control the flow of material (M) into the material inlet ( 24 ).
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