Solid material comminution or disintegration – Apparatus – With automatic control
Patent
1981-11-09
1984-04-17
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With automatic control
241143, 241235, B02C 2500
Patent
active
044429800
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a procedure for the automatic control of a grinding mill roller carriage, equipped with a regulated product feed, which generates a mechanical signal for the control of a metering slide on the product feed, which is dependent thereon. The invention further refers to an automatically controlled grinding mill roller carriage which is equipped with a regulated product feed, for the performance of such a procedure, which has a metering slide for the supply of the product, as well as a connected mechanical signaller, activated by the supply of the product.
The mill grinding, or respectively the production of bread, flour, semolina, steam etc., is the exception in the grinding technique. Because the qualitative requirements for the roller carriage, as well as for its control, are very high, comparative to paint roller mills and others. When paint is ground in paste form, the product is stored above two feed rollers so that the rollers can always draw the same quantity of the product.
The supply of the rolling mill is dependent on the product level in the reservoir. In contrast, the grinding mill roller carriage is part of a completely automatic grinding and straining process. The preparation for grinding occurs over one or two lines, which are then conveyed to one to four, or more raw material passages. The resultant first grit is then split up into several fractions in the plan sifter, from where fractions can be removed as finished products of the grinding process. The remaining fractions are continuously fed into further grinding and sifting operations. The so called `posterior grinding passages` receive individual fall-off from several plan sifters.
Depending on the raw material condition, the grinding preparation and environmental influences, (such as humidity, temperature, etc.), the yield of flour varies from short to large batches from each plan sifter. Short-term interference factors must also be considered, such as accelerated or retarded sliding of the product down inclined planes, etc. The effect of the individual interference factors can become additive, (in a negative sense), or they can equalize. With equal mixtures, fluctuations in performance are mostly under ten percent of the average. However, they may at times be in the range of ten to thirty percent, and this upper limit may go over fifty percent deviation from the average value, with extreme changes in the mixture. When no material to be ground is fed, the posterior grit passages as well as the smoothing rolls must be separated, because of the danger of running the grinding rolls up on each other and the accompanying danger of destruction, due to the high speed turning and full pressure.
The task of a regulated product feed in a grinding mill roller carriage is not to assure a constant feed, because each roller carriage is a link in the whole process chain, and must be capable of fully accepting and processing quantities of the product. The main target of such a regulated product feed is the manufacture of an even product curtain over the full length of the grinding rolls.
Two basic functions apply to the automatic operation of grinding mill roller carriages. They are one: the regulation of the feed, and two: the automatic starting and stopping of a grinding roll. A number of propositions have been made for both functions, whereby the regulation of the feed as well as the automatic starting and stopping of the grinding rolls is dependent on the product feed and must be controlled by a respectively acting feeler element.
CH-PS No. 418 791 describes a grinding mill roller carriage with performance-dependent elements which are controlled by a central, electro-capacitive feed measuring device, which determines if sufficient product is stored in the feed above a feed roll, and which produces the respective electrical control signals for the electro-pneumatic valves that control the starting and stopping of grinding rolls on the one hand, and the regulation of the metering slide on the other. However, on especially difficu
REFERENCES:
patent: 3468488 (1969-09-01), Karrer et al.
patent: 3618865 (1971-11-01), Grundler
Ketting Leendert
Linzberger Robert
Oetiker Hans
Winteler Werner
Bebruder Buhler AG.
Rosenbaum Mark
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