Patent US4180185A successfully refreshed from Google Patents.
US4180185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weight measuring method of powder in an air flow process and apparatus therefor
Assignee: Hokushin Gohan KK
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Filing: 1977-04-20
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Granted: 1979-12-25
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Expires: 1997-04-20
Abstract
Abstract The present invention is aimed at measuring accurately. In an intact state, the weight of powder of particularly low bulk density which fluctuates widely in response to a slight external force. The invention relates to a weight measuring method and apparatus the essential points of which are that the flow pattern of powder flowing by air continuously is standardized by a high pressure fan and, at the same time, on the wall of duct communicating with said high pressure fan, an irradiation ray projector and a radioactive ray detector are oppositely disposed. A control circuit, consisting of an indicate controller, a converter, a ratio setter and an isolator and connected to said radioactive ray detector, provides continuous measuring of the weight of air-flowing powder and enables the subsequent control of various working processes proportionately to said detected weight.
Inventors
- 👤 Teruo Yamamoto
- 👤 Fumikatsu Ishii
- 👤 Miyoji Fujiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:09
CPC Classifications
G; G01; G01G; G01G9/00; G01G9/005; B; B01; B01F; B01F35/00; B01F35/20; B01F35/21; B01F35/211; B01F35/2117; B01F35/80; B01F35/82; B01F35/83; B01F35/832; B01F23/00; B01F23/30; B01F23/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
176 words
A method of measuring the weight of powder as the powder flows in air along a flow path, said method comprising providing a flow duct for said powder utilizing a constant speed, high pressure fan in communication with said flow duct to provide a continuous, uniform flow of the powder in said duct; utilizing a cyclone separator located at the output end of said duct to separate the powder; providing an opening to the ambient at both input and output ends of the flow path; defining a measuring region in the flow path within said flow duct; using a single radioactive beam transmitter and a single radioactive beam detector disposed on opposite sides of the wall of said duct to measure the density of the powder flow through said measuring region; utilizing the measurement produced by said radioactive beam transmitter and radioactive beam detector to determine the weight of the powder; and controlling the operation of a process in which said flow of powder is utilized, in accordance with the weight of the powder so determined.
Claim 2
Independent Claim
176 words
A method of measuring the weight of powder as the powder flows in air along a flow path, said method comprising providing a flow duct for said powder utilizing a constant speed, high pressure fan in communication with said flow duct to provide a continuous, uniform flow of the powder in said duct; utilizing a cyclone separator located at the output end of said duct to separate the powder; providing an opening to the ambient at both input and output ends of the flow path; defining a measuring region in the flow path within said flow duct; using a single radioactive beam transmitter and a single radioactive beam detector disposed on opposite sides of the wall of said duct to measure the density of the powder flow through said measuring region; utilizing the measurement produced by said radioactive beam transmitter and radioactive beam detector to determine the weight of the powder; and controlling the operation of a process in which said flow of powder is utilized, in accordance with the weight of the powder so determined.
Claim 3
Independent Claim
187 words
An apparatus for measuring the weight of powder as the powder flows in air along a flow path, said apparatus comprising a flow duct of uniform cross section in which said powder flows; a constant speed, high pressure fan in communication with said flow duct for providing a continuous, uniform flow of the powder in said duct; a cyclone separator located at the output end of said duct for separating the powder issuing from said duct; means for providing an opening to the ambient at both input and output ends of the flow path; a radioactive beam transmitter and radioactive beam detector disposed on opposite sides of the wall of said duct for measuring the density of the powder flow through a measuring region within said duct; means, responsive the output of said radioactive beam detector during the continuous measurement of density provided by said radioactive beam transmitter and radioactive beam detector, for producing a control signal proportional to the weight of the powder; and means for controlling the operation of a process in which said flow of powder is utilized in accordance with said control signal.
Claim 4
Independent Claim
187 words
An apparatus for measuring the weight of powder as the powder flows in air along a flow path, said apparatus comprising a flow duct of uniform cross section in which said powder flows; a constant speed, high pressure fan in communication with said flow duct for providing a continuous, uniform flow of the powder in said duct; a cyclone separator located at the output end of said duct for separating the powder issuing from said duct; means for providing an opening to the ambient at both input and output ends of the flow path; a radioactive beam transmitter and radioactive beam detector disposed on opposite sides of the wall of said duct for measuring the density of the powder flow through a measuring region within said duct; means, responsive the output of said radioactive beam detector during the continuous measurement of density provided by said radioactive beam transmitter and radioactive beam detector, for producing a control signal proportional to the weight of the powder; and means for controlling the operation of a process in which said flow of powder is utilized in accordance with said control signal.
Claim 5
Dependent Claim
19 words
A weight measuring apparatus as claimed in claim 2 wherein the high pressure fan comprises a booster plate fan.
Claim 6
Dependent Claim
48 words
A weight measuring apparatus as claimed in claim 2 wherein the shape of the section of the duct at which said measuring region is located is such that at least more than 70% of said region is irradiated by the radioactive beam produced by said radioactive beam transmitter.
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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |