US3743461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pelletizer control system
Assignee: Ashland LLC
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Filing: 1972-01-03
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Granted: 1973-07-03
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Expires: 1992-01-03
Abstract
Abstract The application discloses an automatic system for the control of pelletizing apparatus in which continuous weighing means (e.g., a weigh belt) are used to generate a signal representative of the weight of a flow of a ''''loose'''' powdery solid from a feeder (e.g., feed screw) to a pelletizer in which the solid is mixed with a pelletizing fluid, and the flow of pelletizing fluid into the pelletizer is controlled in accordance with the signal by flow regulating means interconnected with the weighing means.
Inventors
- 👤 D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:48
CPC Classifications
G; G01; G01G; G01G11/00; B; B01; B01J; B01J2/00; B29; B29B; B29B9/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
255 words
Apparatus for continuously forming carbon black pellets, said apparatus comprising: a. means for forming pellets; b. carrying means including a conveyer for carrying carbon black powder from a source thereof to said means for forming pellets; c. a first transmitter including weighing means associated with said conveyer for weighing the carbon black present on said conveyer and for producing a weight signal which varies in accordance with and is representative of the varying weights of carbon black present on the conveyer; d. a water conduit having a discharge outlet stationed adjacent a point on said carrying means downstream from the point where said weighing means is associated with said conveyer for adding water to said carbon black; e. a first motor valve in said water conduit; f. a second transmitter, including water flow sensing means in said water conduit, for continuously measuring the flow of water in said conduit and for generating a signal representative of the volume rate at which water is being added to the carbon black; g. a water/carbon black ratio controller connected with said first and second transmitters and operatively associated with said motor valve to receive signals from said transmitters and to open and close said motor valve as the amount of carbon black on said conveyer varies in order to maintain a predetermined ratio between the weight of carbon black and the flow of water; and h. means for drying pellets, including a heat treatment chamber, burners to heat said chamber and a fuel conduit to supply said burners.
Claim 2
Dependent Claim
255 words
Apparatus for continuously forming carbon black pellets, said apparatus comprising: a. means for forming pellets; b. carrying means including a conveyer for carrying carbon black powder from a source thereof to said means for forming pellets; c. a first transmitter including weighing means associated with said conveyer for weighing the carbon black present on said conveyer and for producing a weight signal which varies in accordance with and is representative of the varying weights of carbon black present on the conveyer; d. a water conduit having a discharge outlet stationed adjacent a point on said carrying means downstream from the point where said weighing means is associated with said conveyer for adding water to said carbon black; e. a first motor valve in said water conduit; f. a second transmitter, including water flow sensing means in said water conduit, for continuously measuring the flow of water in said conduit and for generating a signal representative of the volume rate at which water is being added to the carbon black; g. a water/carbon black ratio controller connected with said first and second transmitters and operatively associated with said motor valve to receive signals from said transmitters and to open and close said motor valve as the amount of carbon black on said conveyer varies in order to maintain a predetermined ratio between the weight of carbon black and the flow of water; and h. means for drying pellets, including a heat treatment chamber, burners to heat said chamber and a fuel conduit to supply said burners.
Claim 3
Dependent Claim
198 words
Automatic control apparatus for a pelletizing apparatus, comprising the combination of: a. feeder means for feeding a flow of powdery solids in an unpelletized form at relatively smooth volume rate; b. a weighing device connected to said feeder means and to said pelletizer for continuously receiving and weighing said relatively smooth flow of powdery material while conveying same to the pelletizer, said weighing device including means for producing a weight signal which varies in accordance with and is representative of varying weights of said powdery solids on the weighing device; c. a conduit communicating between a source of pelletizing fluid and a point within the interior of said pelletizer downstream from said weighing device for conveying said fluid thereto; d. valve means in said conduit for regulating the rate of flow of said fluid; and e. ratio control means connected to said weighing device and to said valve means for receiving weight signals from said weighing device and for opening and closing said valve means in response thereto as the weight of powdery solids on said weighing device varies in order to maintain a predetermined ratio between the flows of powdery solids and pelletizing fluid to the pelletizer.
Claim 4
Dependent Claim
198 words
Automatic control apparatus for a pelletizing apparatus, comprising the combination of: a. feeder means for feeding a flow of powdery solids in an unpelletized form at relatively smooth volume rate; b. a weighing device connected to said feeder means and to said pelletizer for continuously receiving and weighing said relatively smooth flow of powdery material while conveying same to the pelletizer, said weighing device including means for producing a weight signal which varies in accordance with and is representative of varying weights of said powdery solids on the weighing device; c. a conduit communicating between a source of pelletizing fluid and a point within the interior of said pelletizer downstream from said weighing device for conveying said fluid thereto; d. valve means in said conduit for regulating the rate of flow of said fluid; and e. ratio control means connected to said weighing device and to said valve means for receiving weight signals from said weighing device and for opening and closing said valve means in response thereto as the weight of powdery solids on said weighing device varies in order to maintain a predetermined ratio between the flows of powdery solids and pelletizing fluid to the pelletizer.
Claim 5
Dependent Claim
41 words
Apparatus in accordance with claim 2 wherein said feeder means includes a chamber having a discharge outlet and rotatable means within said chamber for pushing said powdery solids through said chamber and out of said outlet at a relatively smooth rate.
Claim 6
Dependent Claim
14 words
Apparatus in accordance with claim 3 wherein said feeder means is a screw conveyor.
Claim 7
Dependent Claim
27 words
Apparatus in accordance with claim 4 wherein said scRew conveyor comprises flighting, and a portion of said screw is free of flighting for keeping said conveyor full.
Claim 8
Dependent Claim
51 words
Apparatus in accordance with claim 4 wherein said feeder means includes a first screw conveyor and a second screw conveyor connected to the first so as to receive the powdery material discharged by the first conveyor, said second conveyor being adapted to rotate at a faster rate than the first conveyor.
Claim 9
Dependent Claim
15 words
Apparatus in accordance with claim 1 wherein said weighing device is a weigh belt conveyor.
Claim 10
Dependent Claim
49 words
Apparatus in accordance with claim 7 wherein said weigh belt conveyor includes a pneumatic transmitter, said ratio control means is a pneumatic controller and said valve means is a pneumatic motor valve, said transmitter, ratio controller and valve means being connected with one another by pneumatic control air lines.
Claim 11
Dependent Claim
76 words
Apparatus in accordance with claim 1 wherein flow sensing means are provided in said conduit for sensing the rate of flow of said fluid in said conduit, and for generating a flow signal representative of the rate of flow of said fluid, said ratio control means being connected to said flow sensing means for receiving said flow signal and for maintaining a predetermined relationship between the flow and weight signals by opening and closing said valve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |