Solid material comminution or disintegration – Processes – Cereal and other seeds or seed parts
Patent
1986-11-04
1989-11-21
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
Cereal and other seeds or seed parts
241 37, B02C 904, B02C 2100
Patent
active
048816892
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for setting the spacings of grinding rollers in roller frames of a flour milling plant, each of the roller frames being followed by a screening system, from which is tapped a test signal which is supplied to a computer, which compares it with stored desired value and in the case of a divergence automatically adjusts the spacing of the grinding rollers by means of a control signal and adjusting means.
BACKGROUND OF THE INVENTION
For the control or adjustment of the grinding roller spacings in a flour milling plant at present essentially four solution proposals exist. The first and oldest solution proposal consists of regulating and controling the grinding rollers by the operator (miller). In order to be able to "manually" perform such a control operation, it is absolutely necessary to completely control the complete production sequence. The result of the control is largely dependent on the skill and experience of the operator, who is generally the miller. If it is necessary to use less skilled personnel, e.g. during special periods (holidays, night work, etc.), this can lead to less satisfactory results being obtained by the mill, e.g. through a smaller quantity of light flour being produced or the like.
A second control proposal is described in the journal "Die Muhle und Mischfuttertechnik" of Sept. 3, 1965. The essense of this known proposal is the use of trial screening. During production an absolute classification into the individual particle fractions is not sought, because this would lead to an excessively long screening time and would also cause modifications to the product quality. If e.g. the product being ground is subject for an excessively long period to a screening process, then the screenings also contain fine husks, which would normally float on the top of the material in gyratory sifter operation and would then be discharged as waste. In the case of the theoretical treatment of milling or grinding, it is not possible to take account of such fine points, because they are also dependent on the manner of operation of the preceding and following process machines, i.e. not only the milling per se. In the sense of a complete and absolute regulation of the milling work, it is therefore logical to subject the material being milled to a separate, precise laboratory screening and carry out corrections if variations occur. Although the proposed trial or test screening is more precise, it is not always possible to obtain a representative picture in practice, because the work of the gyratory sifter is, as stated, a combination of screening and sifting and requires a specific product layer over the screen mesh.
Another control possibility is described in EP-B1-13 023 and is based on the fact that any future development in the field of food processing should no longer fundamentally be directed at displacing humans. In fact many processes can be performed faster and less expensively by direct human intervention. Thus, the ever increasing knowledge of the almost complete interlinking of all processes increasingly requires human monitoring and control in cereal processing plants. It has been found that it is not worthwhile to have equipment perform all the processes which the human can monitor, check and manually control.
Another known theoretical proposal for controling a mill (DE-C-2 413 956) aims at replacing the operator, particularly the miller by computers and regulating means. It is based on incorporating the knowledge and experience of the miller in the computer programs and render any routine action on the part of the human superfluous by using independent regulating means. According to this proposal all the grinding rollers are set to a given grinding result on the basis of a previously worked out scheme, namely the ratio of material which does to that which does not pass through the screen. However, a corresponding practical realization of this proposal has not hitherto taken place.
On the basis of the latter prior art, the problem of th
REFERENCES:
patent: 3716196 (1973-02-01), Motek et al.
patent: 4363448 (1982-12-01), Machler et al.
Die Muhle und Mischfuttertechnik, 9-85.
Baltensperger Werner
Lippuner Christian
Gebrueder Buehler AG
Rosenbaum Mark
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