US4087052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical impact mill for the reduction of four micron finest powder
Assignee: ILOK POWER CO Inc
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Filing: 1977-01-27
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Granted: 1978-05-02
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Expires: 1997-01-27
Abstract
Abstract Vertical impact mill for production of very fine powders from larger nut-size pieces of coal, the mill including a series of horizontal impact wheels formed of wheel halves which connected together form an integral shaft-wheel system, the diameter of the impact wheels increasing from top to bottom of the mill, with an inlet at the top of the mill and successive chambers, each housing one impact wheel, and connected by connecting conduits offset from each other by 180°. The mill is designed for use with an inert gas to entrain the powder through and from the mill.
Inventors
- 👤 Hans Rohrbach, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:43
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
145 words
An impact reduction mill for production of fine powder of diameter of about 4 microns, comprising: a rotatably mounted vertical shaft integral with a plurality of impact wheels rotatable with said shaft; the smallest of said impact wheels located nearest the top of said mill, with others of said plurality of impact wheels having increasingly greater diameters, the largest diameter impact wheel being nearest the bottom of said mill: a casing for the mill enclosing said shaft and impact wheels and defining separate chambers for each of said plurality of wheels; an impact opening at the top of said casing, and connections between each of said chambers for gravitational flow of powder from one chamber to the next lower chamber, with the connections between chambers alternately located 180° removed from each other with respect to the axis of rotation fo the shaft and impact wheels.
Claim 2
Dependent Claim
145 words
An impact reduction mill for production of fine powder of diameter of about 4 microns, comprising: a rotatably mounted vertical shaft integral with a plurality of impact wheels rotatable with said shaft; the smallest of said impact wheels located nearest the top of said mill, with others of said plurality of impact wheels having increasingly greater diameters, the largest diameter impact wheel being nearest the bottom of said mill: a casing for the mill enclosing said shaft and impact wheels and defining separate chambers for each of said plurality of wheels; an impact opening at the top of said casing, and connections between each of said chambers for gravitational flow of powder from one chamber to the next lower chamber, with the connections between chambers alternately located 180° removed from each other with respect to the axis of rotation fo the shaft and impact wheels.
Claim 3
Dependent Claim
11 words
The mill of claim 1 wherein there are five impact wheels.
Claim 4
Dependent Claim
18 words
The mill of claim 1, additionally comprising means for rotating said shaft at a speed of 10,000 rpm.
Claim 5
Dependent Claim
17 words
The mill of claim 3, wherein the largest diameter impact wheel has a diameter of 1250 mm.
Claim 6
Dependent Claim
69 words
The mill of claim 1 wherein each impact wheel carries at its outer periphery an even number of impact plates located in opposed pairs at opposite ends of a wheel diameter, the impact plates lying in planes which include a wheel diameter, with circumferentially successive impact plates each being inclined about 60°, in opposite directions, to the plane of revolution of the impact wheel to which they are attached.
Claim 7
Dependent Claim
15 words
The mill of claim 1 wherein the two topmost impact wheels have the same diameter.
Claim 8
Dependent Claim
36 words
The mill of claim 1, wherein successive wheels are connected by a short hollow shaft portion having upper and lower flanges through which the impact wheels are connected to the shaft and thereby to each other.
Claim 9
Dependent Claim
28 words
The mill of claim 7 wherein the lower flange of the shaft portion is of larger diameter than the upper flange, to thereby accomodate a larger impact wheel.
Claim 10
Dependent Claim
38 words
The mill of claim 7 wherein the short hollow shaft portions and the impact wheels are connected by head screws, said shaft portion and head screws, respectively, located concentrically thereby, with said impact wheels, forming the vertical shaft.
Claim 11
Dependent Claim
21 words
The mill of claim 1, additionally comprising a drive motor connected through a gear train for rotatably driving the vertical shaft.
Claim 12
Dependent Claim
10 words
The mill of claim 10, additionally comprising a supporting foot.
Claim 13
Dependent Claim
53 words
The mill of claim 1 additionally comprising a cooling housing surrounding the chambers of the three topmost impact wheels, said housing containing a spiral conduit for conveying a cooling medium from a pressure pump through the cooling housing in a bottom to top direction countercurrent to the flow of powder through the mill.
Claim 14
Dependent Claim
43 words
The mill of claim 1, additionally comprising a revolving apportioner on the top of the mill for receiving feed material through a fall funnel portion thereof, a transport band delivering feed material to the funnel, said transport band and the apportioner being synchronized.
Claim 15
Dependent Claim
64 words
The mill of claim 1, additionally comprising an exit conduit connected to an exit opening in the bottom of the casing, a blower located within the exit conduit for conveying fine powder from the exit opening through said exit conduit, with a magnetic plate located within said conduit downstream of said blower for removing metallic particles from fine powder flowing through said exit conduit.
Claim 16
Dependent Claim
16 words
The mill of claim 1, wherein each impact wheel comprises an integral body of uniform strength.
Claim 17
Dependent Claim
30 words
The mill of claim 1 wherein said impact wheels are located equidistantly spaced along said vertical shaft, with the diameter of said impact wheels increasing in an additive arithmetic progression.
Claim 18
Dependent Claim
23 words
The mill of claim 1 wherein said chambers and said connections between said chambers are formed by protective foils located within said casing.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |