GB867228A - Air system for dry material reduction mills and controls therefor - Google Patents
Air system for dry material reduction mills and controls thereforInfo
- Publication number
- GB867228A GB867228A GB27021/57A GB2702157A GB867228A GB 867228 A GB867228 A GB 867228A GB 27021/57 A GB27021/57 A GB 27021/57A GB 2702157 A GB2702157 A GB 2702157A GB 867228 A GB867228 A GB 867228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- air
- mill
- humidity
- controls
- damper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
867,228. Grinding mills. WESTON, D. Aug. 27, 1957 [Sept. 10, 1956], No. 27021/57. Class 59 [Also in Group XXXV] A dry crushing or grinding mill has the air flows in the mill and its outlet duct separately controlled so that particles below a predetermined size are extracted from the mill and transported in a controlled fluidized mass. Further controls may be provided for the temperature and humidity of air in the system. Fig. 1 shows the elements of a grinding mill system to which these controls may be applied. A mill 11 driven by motor 12 is fed with material by belt conveyer 35 from bin 37; the conveying rate may be adjusted in accordance with the noise in the mill or the power delivered by motor 12. The mill product leaves by duct 13 and over-size material is then removed by classifier 14 for return to the mill by conveyer 33, the remainder passing to a cyclone collector 16. Air is then re-cycled by fan 18 partly to the mill outlet via duct 21, and partly to classifier 14, while some leaves the system via a Venturi scrubber 24. Fig. 2 shows air flow and humidity controls for a similar mill; a control unit 51 adjusts a proportion damper 32 to vary the air velocity in the mill so that a constant proportion of coarse product (measured by weigh-belt 33) to input (measured by weigh-belt 35) is obtained. A unit 54 controls a damper 31 and hence the carrying power of the air duct 13 to maintain a fixed pressure drop across cyclone collector 16. A unit 59 controls the humidity of air in the system; if this rises it opens outlet damper 27 so that more external air is admitted. If the humidity cannot be kept down in this way, a unit 55 senses the fall in temperature of the circulating air due to the influx of outside air and evaporation from input feed (normally the circulating air is 60-80 degrees above ambient temperature) and controls a burner 56 to maintain this temperature differential and thus acts as a further humidity control. Fig. 3 shows an embodiment suitable for dry climates where low humidity may cause a falling-off in the efficiency of cyclone dust extractor 16; a control unit 62 senses the ambient humidity (or it may use a photo cell and light source to measure the quantity of dust in the apparatus) and increases the air bleed-off at 23 when necessary. Alternatively it may inject water at 64. Fig. 3A (not shown) shows a modified apparatus in which temperatures and humidity are controlled independently, a proportion of the saturated air from a Venturi scrubber used in obtaining the "wetbulb" temperature being recycled to maintain the humidity. An "open" system (i.e. in which there is no re-cycling of air) is illustrated in Fig. 8 (not shown). Fig. 5 shows the damper control system of Fig. 2; signals from the weigh belts are fed to coils 96, 97 of a differential relay with contacts E, F in the circuits of two time-delay relays TDR1, 2. The contacts of the latter energize the two halves of split-field motor M which adjusts the damper 32. Specifications 632,532, 696,181, 727,925, 782,523, 783,113 and 788,924 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US867228XA | 1956-09-10 | 1956-09-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB867228A true GB867228A (en) | 1961-05-03 |
Family
ID=22200459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27021/57A Expired GB867228A (en) | 1956-09-10 | 1957-08-27 | Air system for dry material reduction mills and controls therefor |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB867228A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4877445A (en) * | 1972-01-19 | 1973-10-18 | ||
JPS5340462A (en) * | 1977-02-01 | 1978-04-13 | English Clays Lovering Pochin | Improvement relating to pulverizing ore |
CN111804420A (en) * | 2020-07-23 | 2020-10-23 | 安徽巨成精细化工有限公司 | Grinder, proppant hybrid system based on polyacrylamide powder |
CN112934737A (en) * | 2021-03-29 | 2021-06-11 | 广西贺州市科隆粉体有限公司 | Production method of heavy calcium carbonate |
CN113422050A (en) * | 2021-05-19 | 2021-09-21 | 浙江丰明新能源有限公司 | Production system and process for producing graphene-based negative electrode material |
-
1957
- 1957-08-27 GB GB27021/57A patent/GB867228A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4877445A (en) * | 1972-01-19 | 1973-10-18 | ||
JPS5816941B2 (en) * | 1972-01-19 | 1983-04-04 | 日本セメント株式会社 | grinding system |
JPS5340462A (en) * | 1977-02-01 | 1978-04-13 | English Clays Lovering Pochin | Improvement relating to pulverizing ore |
JPS6156026B2 (en) * | 1977-02-01 | 1986-12-01 | Inguritsushu Kureizu Rabaaringu Hoochin Ando Co Ltd | |
CN111804420A (en) * | 2020-07-23 | 2020-10-23 | 安徽巨成精细化工有限公司 | Grinder, proppant hybrid system based on polyacrylamide powder |
CN112934737A (en) * | 2021-03-29 | 2021-06-11 | 广西贺州市科隆粉体有限公司 | Production method of heavy calcium carbonate |
CN112934737B (en) * | 2021-03-29 | 2022-08-12 | 广西贺州市科隆粉体有限公司 | Production method of heavy calcium carbonate |
CN113422050A (en) * | 2021-05-19 | 2021-09-21 | 浙江丰明新能源有限公司 | Production system and process for producing graphene-based negative electrode material |
CN113422050B (en) * | 2021-05-19 | 2022-11-25 | 浙江丰明新能源有限公司 | Production system and process for producing graphene-based negative electrode material |
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