Patent US3727892A successfully refreshed from Google Patents.
US3727892A
Expired / Lapsed
US
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Feedback control for a continuous mixer having a control of internal pressure
Assignee: Farrel Corp
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Filing: 1971-12-14
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Granted: 1973-04-17
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Expires: 1991-12-14
Abstract
Abstract This disclosure is directed toward an electromechanical feedback control for automatically regulating the discharge temperature in a continuous mixer. The feedback control senses both the mixer discharge temperature and the rate of change of mixer rotor torque. The torque rate of change is detected by a derivative circuit and serves to offer an anticipatory signal to the control system. The feedback control then regulates the internal pressure of the mixer in accordance with an error signal representing the difference between the measured mixer discharge temperature plus torque derivative signals and a preset desired temperature command signal.
Inventors
- 👤 K Spitzner
- 👤 A Notte
- 👤 P Hold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:47
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/72; B29B7/728; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/426; B29B7/428; B29B7/429; B29B7/46; B29B7/48; B29B7/482; B29B7/487; B29B7/488; B29B7/489; B29B7/80; B29B7/82; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/375; B29C48/38; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92038; B29C2948/92209; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/92466; B29C2948/92504; B29C2948/92514; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92952; B29C48/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
Apparatus for controlling the temperature of the discharge material in a continuous mixer having a mixer rotor for mixing material and having a control of the pressure on the material within said mixer comprising: means for measuring the discharge temperature of the material to be mixed and producing a signal representing said discharge temperature; means for measuring the mixer rotor torque and producing a signal representing said torque; an electrical control circuit adapted to receive the discharge temperature signal from the discharge temperature measuring means and adapted to receive the mixer torque signal from the mixer torque measuring means and to affect the mixer torque signal in such a way as to produce the filtered derivative of the mixer torque; means for producing a signal representing a predetermined desired temperature of the discharge material; means for activating the pressure control of said mixer in response to a signal representing the difference between the desired discharge temperature signal and the actual measured discharge temperature.
Claim 2
Dependent Claim
163 words
Apparatus for controlling the temperature of the discharge material in a continuous mixer having a mixer rotor for mixing material and having a control of the pressure on the material within said mixer comprising: means for measuring the discharge temperature of the material to be mixed and producing a signal representing said discharge temperature; means for measuring the mixer rotor torque and producing a signal representing said torque; an electrical control circuit adapted to receive the discharge temperature signal from the discharge temperature measuring means and adapted to receive the mixer torque signal from the mixer torque measuring means and to affect the mixer torque signal in such a way as to produce the filtered derivative of the mixer torque; means for producing a signal representing a predetermined desired temperature of the discharge material; means for activating the pressure control of said mixer in response to a signal representing the difference between the desired discharge temperature signal and the actual measured discharge temperature.
Claim 3
Dependent Claim
184 words
A continuous mixer comprising a mixing enclosure having interspaced entrance and exit openings, mixing means contained in said enclosure and which cannot drive material through this enclosure but does permit material to be pushed through this enclosure while being mixed, means for pushing material through said entrance opening into said enclosure and means for restraining the movement of material from said enclosures through said exit opening; wherein the improvement comprises said restraining means including one or more surfaces contacted by the material moving from said enclosure and which move in the direction of the movement of this material and means for controlling the movement of said surface or surfaces to control the restraint on said material and temperature sensing means located to measure the temperature of the heat created in said material by said mixing means, and means for measuring the power contributed by said mixing means to said material and means automatically responsive to said temperature sensing means and said mixer power measuring means for controlling said means controlling the movement of said surface or surfaces to control the restraint on said material.
Claim 4
Dependent Claim
184 words
A continuous mixer comprising a mixing enclosure having interspaced entrance and exit openings, mixing means contained in said enclosure and which cannot drive material through this enclosure but does permit material to be pushed through this enclosure while being mixed, means for pushing material through said entrance opening into said enclosure and means for restraining the movement of material from said enclosures through said exit opening; wherein the improvement comprises said restraining means including one or more surfaces contacted by the material moving from said enclosure and which move in the direction of the movement of this material and means for controlling the movement of said surface or surfaces to control the restraint on said material and temperature sensing means located to measure the temperature of the heat created in said material by said mixing means, and means for measuring the power contributed by said mixing means to said material and means automatically responsive to said temperature sensing means and said mixer power measuring means for controlling said means controlling the movement of said surface or surfaces to control the restraint on said material.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |