CA1237709A - Mill stone - Google Patents
Mill stoneInfo
- Publication number
- CA1237709A CA1237709A CA000471103A CA471103A CA1237709A CA 1237709 A CA1237709 A CA 1237709A CA 000471103 A CA000471103 A CA 000471103A CA 471103 A CA471103 A CA 471103A CA 1237709 A CA1237709 A CA 1237709A
- Authority
- CA
- Canada
- Prior art keywords
- mill
- stone
- depression
- mill stone
- depressions
- 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
- 239000004575 stone Substances 0.000 title claims abstract description 45
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/11—Details
- B02C7/12—Shape or construction of discs
- B02C7/13—Shape or construction of discs for grain mills
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a mill, the mill stone (1), of natural or sythetic stone, is pro-vided with a depression (4) on the grinding surface, said depression ex-tending radially from the central opening (3). Viewed from the side, the de-pression (4) is wedge-shaped. There is either only one depression (4) pro-vided or, in the event that a plurality of such depressions is provided, these do not border on each other, but there is in each instance a plain hub area (15) between two such depressions. This fact results in a cooler grind-ing process.
In a mill, the mill stone (1), of natural or sythetic stone, is pro-vided with a depression (4) on the grinding surface, said depression ex-tending radially from the central opening (3). Viewed from the side, the de-pression (4) is wedge-shaped. There is either only one depression (4) pro-vided or, in the event that a plurality of such depressions is provided, these do not border on each other, but there is in each instance a plain hub area (15) between two such depressions. This fact results in a cooler grind-ing process.
Description
I
The present inventioIl relates to a mill stone of natural or Cynthia-tic stone, said mill stone being intended for a mill.
A mill of this kind has two cylindrical, disk-like mill stones have in at least one depression on the grinding surface, said depression extend-in radially from a central opening in the stone.
The mill stones are, in general, horizontally oriented, one stone being stationary, the other rotating. The stones are produced From hard, tough material, for example, quartzite. A known natural stone, quarried and prepared in the Sexton area, South Twirl, consists of porphyritic quartz and crystalline shale, with augmentations of limestone and sandstone-like inclusions. Mill stones are frequently provided with radial grooves. The material that is to be ground is fed into the center of the mill stone and reduced by friction and cutting during tile milling process.
There are three kinds of mills:
a) The top rotating mill, in which the lower mill stone remains stationary, while the uppermost stone rotates;
b) The bottom rotating mill, in which the upper stone remains stationary, while the lower one rotates; and c) The vertical mill, in which the stones are vertical.
The present invention relates in particular to a mill stone that is used for grinding corn. At the start of the grinding process Kit is a ant-teal problem -to ensure that a temperature of ~0C is not exceeded, since ox-cessive heat causes a considerable drop in the quality Ott tile finished pro-duct. It is desirable to improve the hourly output of even smaller mills, such are used domestically and in agriculture, and which have mill stones that are 13 - 30 cm in diameter.
27~67 13/cj -1-~3~7'7~3~
The present invention provides a mill stone err a mill, said mill stone having a grinding surface, with at least one depression on said grind-in surface extending radially from a central opening, wherein said depress soon is of wedge-shaped contour in side elevation, with a sloping bottom sun-face that rises in the direction of rotation and having two limiting surfaces oriented at least approximately radially, and wherein where more than one said depression is present, a plain hub area extends in the direction of no-station from one depression edge to the edge of the adjacent depression Tests have shown that mills that operate with mill stones accord-in to the present invention run at half the usual milling temperature for the same hourly output. Furthermore, it transpires that the energy consume-lion of the mill can be reduced by one-quarter to one third.
Good results are obtained with one or with two diametrically oppose Ed depressions.
In order to obtain the optimum measured results, it has been shown to be advantageous to have a ratio of the sides of the limiting surfaces and of the bottom Sirius between 1 : 3 and 1 : 12, in which regard, the best results were obtained with side ratios between 1 : 6 and 1 : I.
An exemplary version of the present invention is described below on the basis of the drawing appended hereto, wherein:
Figure 1 is a perspective view of a mill stone according to the present invention;
Figure 2 is a plan view;
Figure 3 is a cross-section on the line IT - I in Figure 2; all Figure is a schematic sectional representatiorl of a mill that incorporates a mill stone according to the present invention.
~3~7'709 The mill stone 1 according to the present invention has a concave grinding Sirius 2. At the end of the central opening 3, which in the uppermost stone 1 serves as a charging opening, there are two diametrically opposed depressions I.
These depressions are approximately rectangular and, viewed in a radial direction, as in Figure 3, are wedge shaped. They have a bottom surface 5 that rises in the direction of rotation, and a rearward limiting surface 6 that is provided more or less parallel to the axis of rotation of the mill stone. It is to be noted, that the depressions extend only a short distance from the edge of the central opening into the mill stone 1, and does not extend as far as the outer edge of the mill stone.
The ratio of the sides US and US of the bottom surface 5 and the rear limiting surface 6 is approximately 1 : 7 in the example shown.
The mill according to the present invention, shown in the exempt-cry example, has an upper and a lower mill stone 1, each of said stone being mounted in plastic tubs 7,8. The upper of the two mill stones 1 is fixed and together with its tub 8 is screwed into a sleeve-like mounting 10 that has a thread 9. It is possible to regulate the distance between the mill stones 1 by screwing the tub in and out owe the mounting 10.
The lower stone 1 is the rotating stone and is driven by an elect trig motor 12 through a shaft 11.
The output achieved with a mill according -to the present invention is 5 - 7 kg fine-ground substance per hour, although the use owe the mill stones 1 is not restricted to this range owe output, The mill stone 1 according to the present involution can be of net-rural or synthetic stone.
The present inventioIl relates to a mill stone of natural or Cynthia-tic stone, said mill stone being intended for a mill.
A mill of this kind has two cylindrical, disk-like mill stones have in at least one depression on the grinding surface, said depression extend-in radially from a central opening in the stone.
The mill stones are, in general, horizontally oriented, one stone being stationary, the other rotating. The stones are produced From hard, tough material, for example, quartzite. A known natural stone, quarried and prepared in the Sexton area, South Twirl, consists of porphyritic quartz and crystalline shale, with augmentations of limestone and sandstone-like inclusions. Mill stones are frequently provided with radial grooves. The material that is to be ground is fed into the center of the mill stone and reduced by friction and cutting during tile milling process.
There are three kinds of mills:
a) The top rotating mill, in which the lower mill stone remains stationary, while the uppermost stone rotates;
b) The bottom rotating mill, in which the upper stone remains stationary, while the lower one rotates; and c) The vertical mill, in which the stones are vertical.
The present invention relates in particular to a mill stone that is used for grinding corn. At the start of the grinding process Kit is a ant-teal problem -to ensure that a temperature of ~0C is not exceeded, since ox-cessive heat causes a considerable drop in the quality Ott tile finished pro-duct. It is desirable to improve the hourly output of even smaller mills, such are used domestically and in agriculture, and which have mill stones that are 13 - 30 cm in diameter.
27~67 13/cj -1-~3~7'7~3~
The present invention provides a mill stone err a mill, said mill stone having a grinding surface, with at least one depression on said grind-in surface extending radially from a central opening, wherein said depress soon is of wedge-shaped contour in side elevation, with a sloping bottom sun-face that rises in the direction of rotation and having two limiting surfaces oriented at least approximately radially, and wherein where more than one said depression is present, a plain hub area extends in the direction of no-station from one depression edge to the edge of the adjacent depression Tests have shown that mills that operate with mill stones accord-in to the present invention run at half the usual milling temperature for the same hourly output. Furthermore, it transpires that the energy consume-lion of the mill can be reduced by one-quarter to one third.
Good results are obtained with one or with two diametrically oppose Ed depressions.
In order to obtain the optimum measured results, it has been shown to be advantageous to have a ratio of the sides of the limiting surfaces and of the bottom Sirius between 1 : 3 and 1 : 12, in which regard, the best results were obtained with side ratios between 1 : 6 and 1 : I.
An exemplary version of the present invention is described below on the basis of the drawing appended hereto, wherein:
Figure 1 is a perspective view of a mill stone according to the present invention;
Figure 2 is a plan view;
Figure 3 is a cross-section on the line IT - I in Figure 2; all Figure is a schematic sectional representatiorl of a mill that incorporates a mill stone according to the present invention.
~3~7'709 The mill stone 1 according to the present invention has a concave grinding Sirius 2. At the end of the central opening 3, which in the uppermost stone 1 serves as a charging opening, there are two diametrically opposed depressions I.
These depressions are approximately rectangular and, viewed in a radial direction, as in Figure 3, are wedge shaped. They have a bottom surface 5 that rises in the direction of rotation, and a rearward limiting surface 6 that is provided more or less parallel to the axis of rotation of the mill stone. It is to be noted, that the depressions extend only a short distance from the edge of the central opening into the mill stone 1, and does not extend as far as the outer edge of the mill stone.
The ratio of the sides US and US of the bottom surface 5 and the rear limiting surface 6 is approximately 1 : 7 in the example shown.
The mill according to the present invention, shown in the exempt-cry example, has an upper and a lower mill stone 1, each of said stone being mounted in plastic tubs 7,8. The upper of the two mill stones 1 is fixed and together with its tub 8 is screwed into a sleeve-like mounting 10 that has a thread 9. It is possible to regulate the distance between the mill stones 1 by screwing the tub in and out owe the mounting 10.
The lower stone 1 is the rotating stone and is driven by an elect trig motor 12 through a shaft 11.
The output achieved with a mill according -to the present invention is 5 - 7 kg fine-ground substance per hour, although the use owe the mill stones 1 is not restricted to this range owe output, The mill stone 1 according to the present involution can be of net-rural or synthetic stone.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A mill stone for a mill, said mill stone having a grinding surface, with at least one depression on said grinding surface extending radially from a central opening, wherein said depression is of wedge-shaped contour in side elevation, with a sloping bottom surface that rises in the direction of rotation and having two limiting surfaces oriented at least approximate-ly radially, and wherein where more than one said depression is present, a plain hub area extends in the direction of rotation from one depression edge to the edge of the adjacent depression.
2. A mill stone according to claim 1, wherein two diametrically oppos-ed depressions are provided.
3. A mill s-tone according to claim 1, wherein the ratio of the sides of the limiting surfaces and the bottom surface that are adjacent to the central opening is between 1:3 and 1:12.
4. A mill with at least one mill stone according to claim 1, 2 or 3.
5. A mill stone according to claim 3 wherein said ratio is about 1:7.
6. A mill stone according to claim 1, 2 or 3 which is of natural stone .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATAA4561/83 | 1983-12-29 | ||
| AT456183A AT384751B (en) | 1983-12-29 | 1983-12-29 | MILLSTONE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1237709A true CA1237709A (en) | 1988-06-07 |
Family
ID=3565605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000471103A Expired CA1237709A (en) | 1983-12-29 | 1984-12-28 | Mill stone |
Country Status (3)
| Country | Link |
|---|---|
| AT (1) | AT384751B (en) |
| CA (1) | CA1237709A (en) |
| DE (1) | DE8435448U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT2244U3 (en) * | 1998-04-17 | 1999-03-25 | Steiner Johann | DISK MILL FOR GRINDING GRANULAR GOODS, E.g. CEREALS, CORN AND THE LIKE |
| WO2017093062A1 (en) | 2015-12-03 | 2017-06-08 | Wolfgang Mock Gmbh | Millstone arrangement for a flat burr grinder for grinding material to be ground |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US583532A (en) * | 1897-06-01 | Metallic mill-bur |
-
1983
- 1983-12-29 AT AT456183A patent/AT384751B/en not_active IP Right Cessation
-
1984
- 1984-12-04 DE DE19848435448 patent/DE8435448U1/en not_active Expired
- 1984-12-28 CA CA000471103A patent/CA1237709A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ATA456183A (en) | 1987-06-15 |
| AT384751B (en) | 1988-01-11 |
| DE8435448U1 (en) | 1985-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |