US3783527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying apparatus with feed and humidity control
Assignee: EIDP Inc
•
Filing: 1972-12-13
•
Granted: 1974-01-08
•
Expires: 1992-12-13
Abstract
Abstract An improved dryer for bulk material of the type employing a feed apron, a pin elevator and an endless, foraminous belt moved through a series of air drying zones, the improvement comprising (A) a humidity transducer in the air exhaust stack arranged to regulate flow of steam to a sparger under the belt in a zone and (B) a power level transducer attached to the pin elevator drive motor, a temperature transducer located under the belt in the final zone, each transducer connected through a separate controller to a booster relay arranged to select the lower of the two control signals and apply this to regulate feed apron drive motor speed.
Inventors
- 👤 G Driscoll
- 👤 J Wellborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:08
CPC Classifications
F; F26; F26B; F26B21/00; F26B21/30; F26B21/33; F26B17/00; F26B17/02; F26B17/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
142 words
In an apparatus for continuously drying material including an endless belt dryer chamber supplied with material by a pin elevator driven by a motor and a feed apron driven by a variable speed motor the improvement comprising: a power level transducer connected to the pin elevator motor for detecting the power consumed by the pin elevator motor and for generating first signals proportional to the power consumed by the pin elevator motor; a temperature transducer located in said dryer chamber for detecting the temperature therein and for generating second signals proportional to the temperature detected; means for comparing said first and second signals and for selecting the lower of said signals; and a controller connected to said feed apron motor for regulating the speed of said feed apron motor, said controller being actuated by the lower of said first and second signals.
Claim 2
Dependent Claim
142 words
In an apparatus for continuously drying material including an endless belt dryer chamber supplied with material by a pin elevator driven by a motor and a feed apron driven by a variable speed motor the improvement comprising: a power level transducer connected to the pin elevator motor for detecting the power consumed by the pin elevator motor and for generating first signals proportional to the power consumed by the pin elevator motor; a temperature transducer located in said dryer chamber for detecting the temperature therein and for generating second signals proportional to the temperature detected; means for comparing said first and second signals and for selecting the lower of said signals; and a controller connected to said feed apron motor for regulating the speed of said feed apron motor, said controller being actuated by the lower of said first and second signals.
Claim 3
Dependent Claim
67 words
The apparatus as defined in claim 1, said dryer chamber having an exhaust duct connected thereto and a steam sparger located therein for admitting steam into said chamber and further including means for detecting relative humidity in said exhaust stack and generating third signals proportional thereto; a controller connected to said steam sparger for regulating the steam flow therethrough, said controller being actuated by said third signals.
References Cited (Backward Citations)
CA480355A
Cited
US3102794A
Cited
US3186102A
Cited
US3259995A
Cited
US3396476A
Cited
US3599343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |