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the Technique of experimental researches

In the given work it is offered to investigate the processes proceeding in a centrifugal counterflow mill in two stages.

At the first stage it is necessary to make trial experiments. Search experiments allow to spend measurements and the supervisory control of varied factors, namely: rotating speeds of rotors, particle sizes of an initial material and a ready product in an operating mode of an experimental centrifugal counterflow mill at the set ranges of submitted particles of a material.

The given researches should be made at various combinations of the factors subjected to regulation and to select the factors most influencing process of levigating.

At the second stage it is necessary to make experimental researches according to the experiment plan on a limestone grinding, applying a method of superposition of the data received at the first stage at the same combinations of changeable parametres with use of criteria of an estimation of results of process of levigating.

In an experimental centrifugal counterflow mill it is possible to present an order of carrying out of experimental researches of process of a grinding in the form of the flowchart presented in drawing 3. 12.

Drawing 3.12. Algorithm of carrying out of experimental researches of process of a grinding in an experimental centrifugal counterflow mill

The grain-growing structure of a levigated material and material as a result of a grinding was established by means of standard devices and devices.

For a sieve test the vibrating plate compactor of mark SMM with a set sit №10, 7, 5, 3, 2, 1, 063, 0315, 008 in accordance with GOST 6613-86 was used; a scales laboratory CASSW-10 - M in accordance with GOST 24104 - 2001; the chamber of drying with temperature to 120°С; cups from porcelain the size of 200 mm.

The sieve 008 was applied to definition of the bottom class of a product of a grinding by a technique [59, 72]. Power inputs were defined by means of the electric counter SAZU it 680 GOST 6570-96. Rotating speeds of rotors and bulwarks of electric motors of a drive were fixed by means of indications of frequency converters VFD-EL Delta VFD037EL43A.

Deflexions of values at definition of weight of levigated materials and grinding products yo 4 %; at definition of weight of the residues on sitah yo 3 %; at definition of expenses of the electric power yo 3 %; time of carrying out of experiment yo 2 %.

The set was applied to grading of a ready product sit (063; 0315; 008). For measurement of a specific surface of products of a grinding device PSH - 12 was used.

Values of deflexions in indications of devices and the measuring equipment are confirmed with reliability of measurements according to applied techniques. The establishment of levels of factors and corresponding parametres of optimisation gives the chance to analyze the obtained data. The general error of measurements does not exceed 5 % that provides possibility to do authentic conclusions by results of experiments.

3.4

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A source: CHUNGUROVA TATYANA LEONIDOVNA. PERFECTION of the DESIGN And GRINDING PROCESS In the CENTRIFUGAL COUNTERFLOW MILL. The DISSERTATION on competition of a scientific degree of a Cand.Tech.Sci. Belgorod - 2017. 2017

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