Claims
- 1. A system for measuring and regulating the interspace between a pair of relatively rotating metallic grinding discs in grinding apparatus for grinding fibrous cellulosic material, comprising:
- (a) an electric circuit having its terminals connected to one of said grinding discs at portions electrically insulated from one another;
- (b) conductive cell in said interspace bridging the terminals and having a resistance which varies in accordance with variations in the width of the interspace to thereby produce a fluctuating current; and
- (c) means in said circuit responsive to said current for measuring the width of said interspace.
- 2. A system according to claim 1, in which the fibrous cellulosic material comprises moisture-containing wood chips and the conductive cell comprises moisture resulting from the grinding process.
- 3. A system according to claim 1, in which the grinding discs comprise at least two segments electrically insulated from one another and the terminals are connected to separate segments.
- 4. A system according to claim 1, in which one of the grinding discs is stationary while the other one rotates, and the circuit is connected to the stationary disc.
- 5. A system according to claim 1, in which the interspace measuring means comprise an ammeter in which the current deflection indicator is calibrated to measure the width of the interspace.
- 6. A system according to claim 4, in which the rotating disc is supported on a shaft which is reciprocated axially by servomotor means actuated by said interspace measuring means in response to current fluctuations to maintain said interspace at a predetermined width.
- 7. A system according to claim 6, in which the electric circuit includes circuit-breaking means for interrupting grinding operations upon metallic contact between the discs.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7503967 |
Apr 1975 |
SW |
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Parent Case Info
This is a continuation, of application Ser. No. 670,359 Filed Mar. 25, 1976, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3212721 |
Asplund et al. |
Oct 1965 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
670359 |
Mar 1976 |
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