SU1423156A1 - Jet-type mill - Google Patents

Abstract

The invention relates to devices for jet grinding materials in various industries. The aim of the invention is to increase the efficiency of the grinding process and adjust the dispersion of the material being ground. For this, the classifier is made of an outer 9 and an inner 10 perforated cylinders coaxially mounted in the center of the flat grinding chamber 2 with the possibility of mutual movement. As a result. the dynamics of the grinding process are improved, and the ability to control the dispersibility of the material to be ground is realized. 2 Il. (C (L

Description

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The invention relates to apparatus for the fine grinding of various materials and can be used in the chemical, construction and other industries.

The purpose of the invention is to increase the efficiency of the grinding process and adjust the dispersion of the material being ground.

FIG. 1 shows a jet mill, a longitudinal section; figure 2 - section aa in figure 1.

The jet mill comprises a housing 1, a flat grinding chamber 2, the inner side surface of which is made in the shape of a polyhedron, an energy-distributing manifold 3, nozzles 4, an upper 5 and lower 6 covers, a loading device 7, a discharge pipe 8 and a classifier consisting of . Gun 9, {internal 10 perforated cylinders and rotary mechanism 11.

The mill works as follows.

The source material by the loading device 7 is fed into the grinding chamber. 2, limited to the inner side surface of the housing 1 and the inner surfaces of the upper 5 and lower 6 lips. The gas energy from the distribution manifold 3 flows through the grinding nozzles 4 into a diverting vortex two-phase flow (gas - solid phase), enclosed in a grinding chamber with a central drain. The nozzle axes are located relative to the respective radii of the chamber at an angle of ° C (the deflection angle of the nozzles). Gas jets, sucking in a two-phase medium, accelerate the solid phase, which leaves the gas flares of the jet moving to the junction points of the jets — areas of collision and grinding of particles accelerated in

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intersecting streams. The constrained development of the latter leads to the formation of areas of reduced pressure and, as a consequence, to the appearance of vortex flows filling the rarefied areas. The formation of vortex flows causes the solid phase to vibrational-rotational movement, which contributes to more intense abrasion. The crushed material with particles of the appropriate size, passing through the slots of the perforated outer 9 and inner 10 cylinders of the classifying device, flows through the discharge port 8 into the cyclones for deposition. Large particles hit the surface of the wall of the outer cylinder 10 and, under the action of inertia forces directed radially from the center to the periphery, are thrown into the grinding zone where they are regrinding. The adjustment of the dispersion of the finished product is carried out by setting the corresponding width of the through-slot of the perforated cylinders 9 and 10 by means of a turning mechanism 11.

Formula of invention

Jet mill containing a flat grinding chamber, inside of which is placed a classifier, nozzles, distribution. energy collector, loading device and discharge nozzle, characterized in that, in order to increase the efficiency of the grinding process and adjust the dispersion of the material being crushed, the classifier device is coaxially mounted in the center of the grinding chamber with the possibility of mutual movement of the outer and inner perforated cylinders.

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Compiled by B.Mol vko Editor M.Tovtin Tekhred L.Oliynyk Proofreader V.Romanenko

Claims (1)

Claim An inkjet mill containing a flat grinding chamber, inside of which there is a classification device, nozzles, distribution. energy carrier collector, loading device and discharge pipe, characterized in that, in order to increase the efficiency of the grinding process and adjust the dispersion of the crushed material, the classification device is made in the form of coaxially mounted in the center of the grinding chamber with the possibility of mutual movement of the outer and inner perforated cylinders. fie. 2