Solid material comminution or disintegration – Processes – Plural successive comminuting operations
Patent
1992-08-13
1994-11-08
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
Plural successive comminuting operations
241 30, 241 36, 241 37, 241159, 241231, 241233, B02C 2500
Patent
active
053619951
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to an automatic product feed for a milling roller mill having a mechanical sensor, a product feed device with adjustable drive means for the feed rolls, as well as engaging and disengaging means for the grinding rolls, and to a method for controlling the grinding in a milling roller mill.
2. Description of the Related Art
Strictly defined general conditions must be met for regulating the product feed in a milling roller mill. They are: a bandwidth and metered to the grinding rolls while compensating for temporary feed fluctuations as far as possible; feed to the grinding rolls must be stopped with minimum delay and the grinding rolls must be moved apart simultaneously.
With respect to apparatus, various basic elements such as distributing rolls and feed rolls as well as a mechanical probe as sensor for precision regulation of the flow to the grinding rolls have been used successfully for decades. In principle, the momentary adjustment of the amount of product flowing into the grinding rolls can be effected in two ways: by regulating the rate of rotation or speed of the feed rolls or by regulating the metering gap between a proportioning slide and the feed roll which is also known as segment distribution.
Both arrangements, i.e. speed regulation and segment distribution, are currently practiced.
An example of speed regulation is described in DE-GM No. 86 14 505 and has proven very successful for some applications. However, speed regulation is not as widely used as segment distribution. A regulation of the metering gap is disclosed in EP-PS 38 054, likewise by the present Applicant. When the product to be metered has a flour-like or gritty quality, segment distribution is preferred in practice by the majority of millers. On the other hand, speed regulation has often proved superior to segment distribution in the case of flaky products as in the metering of break, e.g. prior to the second grinding passage in the mill.
The problem which now arises consists in the fact that it must first be determined in principle for every roller mill which concept to install for regulating the feed. A subsequent conversion is often not carried out and thus an absence of optimal feed regulation may recur repeatedly in individual grinding passages.
The grinding process is acknowledged as the core of every mill. Therefore, the quality of the grinding is influenced by a number of parameters. Special importance is attached to the regulation of the product feed to the grinding rolls and to trouble-free operation of the elements required for this. The degree of automation in a modern mill has already reached a particularly high level. A further increase in automation is demanded, not least of all, to ensure quality, at least to the extent that the parameters already presently influenced by hardware technology can be exploited to achieve even greater perfection so as to enable easier access through human intervention and management of the process.
Significantly, an actual conflict of goals can be discerned precisely in regard to the roller mill. This is caused in part by prejudices of an almost ideological character, even in technical circles. Some say that mechanics are now out of date, that modern techniques such as electronics or sensor technology, e.g. optical, capacitive, infrared measuring technology, are superior and more advantageous since electrical/electronic signals are generated immediately. Many trained specialists still attach an almost mystical significance to computer technology accompanied by a strong reliance or euphoric acceptance. As a result, a great number of solutions are offered, each of which, without exception, has achieved only partial acceptance.
SUMMARY OF THE INVENTION
It is the object of the present invention to alleviate these disadvantages, at least in part, so as to provide a solution with or without overriding control and in particular to offer the possibility of immediate or subsequent integration in an overriding c
REFERENCES:
patent: 4442980 (1984-04-01), Oetiker et al.
patent: 4881689 (1989-11-01), Lippuner et al.
Hostettler Rene
Maechler Ernst
Buehler AG
Han Frances
Rosenbaum Mark
LandOfFree
Automatic product feed and method for controlling a milling roll does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic product feed and method for controlling a milling roll, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic product feed and method for controlling a milling roll will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1776310