DE3005418A1 - Automatic granule mixture distribution measurement - is by successive sieving and weighing using balance connected to computer with display - Google Patents

Abstract

The method and arrangement are for automatic measurement and evaluation of the distribution of granules in a mixture, esp. of material to be ground, involve sorting, weighing, and a graphic display. This saves much of the labour, time, and running costs of conventional manual methods. The fractions of granules arising from the sorting process are fed directly to a weighing device., which passes measurement value to a processor. The sum of the wts. of the fractions is also measured and fed to the processor in electronic form. A set of sieves contains several sieves (1,2,3,4) in series connected to a balance (6) with a digital measurement transducer (7) connect a computer (8) with a printer (9) and/or display (10).

Description

Method and device for automatic determination and

Evaluation of the grain distribution of a grain mixture The invention relates to a method and apparatus for automatic detection and evaluation of the grain distribution of a grain mixture, in particular a grist sample, through classification, weighing and graphical representation.

So far, in many cases the classification, weighing and graphic Evaluation of the grain distribution of a grain mixture carried out by hand. However, this is associated with a high expenditure of personnel, time and money.

The object of the invention is to create a method that an automatic determination and evaluation of the grain distribution of a grain mixture enables.

This object is achieved in that the resulting in the classification Grain fractions are fed directly to a weighing device and from this by weight are detected, and that the resulting measured variables are fed to a computer will.

By these measures according to the invention, the grain distribution of a Mixture of grains in both continuous and discontinuous operation can be determined and evaluated very quickly. Doing this can be very beneficial Deviations in the grain distribution of a grain mixture occurring during operation of specified target values are recorded and corrected. Sources of error related to the usual manual determination and evaluation of the grain distribution of a Mixture of grains occurred are eliminated by the measures according to the invention.

In an advantageous development of the invention, the weights of the Grain fractions are summarized on a high-speed scale and the weighing results converted into electronic measurands. This enables a particularly precise determination and evaluation of the grain distribution of a grain mixture.

Further details, features and advantages of the invention result from the following explanation of one shown schematically in the drawing Process tree for carrying out the method according to the invention.

A sieve test set consisting of sieves 1, 2, 3 and 4 becomes a a predetermined amount of sample quantity of grist is supplied in the direction of arrow 5. The sieve residues or overflow grain fractions I, II, III, IV and the sieve passage V are given to a high-speed scale 6 with digital transducer 7 one after the other.

The weights of these grain fractions are summarized on the high-speed scale 6 determined and the weighing results from the digital transducer 7 into electronic measured values converted and fed to a computer 8 (computer). In the computer 8 can do a lot advantageously the measurement results as a mass fraction of the individual fractions or scale sums (Sieve residue or sieve passage) calculated and dashed by one in the drawing printer 9 shown can be printed out. In addition, it is also possible to the computer 8 to connect a draftsman 10, which the grain size characteristic after a predetermined grain network or a predetermined function, e.g.

RRSB function (Rosin-Rammler-Sperling-Bennett function) graphically records. Deviations from previously entered target values can also be detected by the computer determined and identified. Finally, one can also do company sieve analyzes the test sieves, including the one on them, with the same starting product Weigh the sieve residue and including the grain size adhering to the sieve mesh, and pass the resulting measured variables to the computer 8 for evaluation. In this case, however, the respective tare weights must be entered into the computer 8 beforehand will.

Claims (3)

Patent claims method for automatic determination and evaluation the grain distribution of a grain mixture, in particular a grist sample Classification, weighing and graphical representation, that is to say c h n e t that the grain fractions resulting from the classification are directly one Weighing device supplied and detected by this weight, and that the The measurement variables resulting therefrom are fed to a computer. 2. The method according to claim 1, characterized in that the weights the grain fractions are determined on a high-speed scale, and the weighing results can be converted into electronic measurands. 3. Apparatus for performing the method according to claim 1 and 2 characterized by a sieve set consisting of several sieves (1, 2, 3, 4) as well as an attached high-speed scale (6) with digital transducer (7) and a computer (8) with printer (9) and / or draftsman (10).