SU1291204A1 - Centrifugal mill - Google Patents

Abstract

This invention relates to the construction of fine mills for fragile materials and can be used in the chemical, mining, pharmaceutical and other industries of the industry. The purpose of the invention is to intensify the process of grinding dispersed materials. The mill contains a cylindrical body 1 with spiral overflows 2 placed behind the body 1, the main rotor 5 with the overflow holes 6, accelerating vanes 7 and limiters, closed with a ring 9 from above, ventilation blades 10, an additional rotor 12 with loading openings 13 and baffle separators consisting of percussion 14 and separation parts 15 and tangentially fixed discharge port 17. A large fraction is accelerated and thrown onto the surface of percussion part 14 baffles separators. Undestructed particles of the material through the separation channels due to inertial forces along spiral flows 2 are returned to regrinding. The fine fraction of the air flow through the space between the ring 9 and the additional rotor 12 is sucked to the center of rotation, picked up by the source material and through the reflux holes 6 by ventilation blades 10 through the tangential discharge pipe 17 is removed from the mill. 3 il. (L 2 7; 2 7 14 15 /., L. 7 V Yu SO N3 O 4/7

Description

This invention relates to centrifugal mills for the fine grinding of brittle materials and can be used in the chemical, chemical and other industries.

The purpose of the invention is to intensify the grinding process.

FIG. 1 shows the proposed mill, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a view B in FIG. 1. The mill contains a cylindrical body 1 with spiral overflows 2, placed outside the cylindrical case of the mill, ending with additional charging nozzles 3. In case 1, the main rotor 5 is mounted on shaft 4 with overflow holes 6 and accelerating vanes 7 located at an angle of 25-50 ° with respect to the tangent drawn to the flow restrictor 8 at the installation point of the accelerating blade. The limiters 8 of the sign-curvature above are covered by a covering ring 9, ventilation blades 10 are mounted on the shaft 4. An additional rotor 12 is fixed on the hollow shaft 11 with loading openings 13 and baffles-separators consisting of the shock part 14 installed at an angle of 35 45 ° with respect to the tangent to the accelerating blades 7 and the separation part 15, which is fixed radially relative to the center of rotation, forming the separation channels 16. The discharge nozzle is located tangentially to the body 1.

The mill works as follows.

The material to be ground is fed through the hollow shaft 11 into the center of the main rotor 5, rotating counterclockwise. Under the action of centrifugal forces arising during rotation of the rotor, and due to the flow of air that is sucked through the air mill, the material particles fall onto the surface of the accelerating blades 7, the fine fraction of the material going to grinding through the overflow holes 6 by the ventilation blades 10 is pulled through the discharge tangential nozzle 17 removed from the mill.

The coarse fraction is accelerated and thrown onto the surface of the striking part 14 of the striker-separators mounted on an additional rotor 12, rotating clockwise, loaded, large particles of material due to inertia forces through the separation channels flow into the spiral flows and return to rest on the main the rotor 5 through the additional loading nozzles 3 and the loading openings 13 of the additional rotor 12.

The fine fraction of the air flow through the space between the covering ring 9 and the additional rotor 12 is sucked to the center of rotation of the rotor and picked up by the material going for grinding, gets to the surface of the accelerating blades 7 through the overflow holes 6 the ventilation blades 10 through the tangential discharge nipple 17 is removed from mills.

Installing the striking part of the bump stops of the separators at an angle of 35-45 ° with respect to the tangent to the accelerating blades and accelerating blades at an angle of 25-50 ° with respect to the tangent carried out

to the stopper to the mounting point of the accelerating blade, it allows the material to be destroyed by intensive perpendicular impacts. Increasing these angles to 50 and 55 °, respectively, and reducing them to 30 and 20 ° leads to the fact that the material is destroyed by non-perpendicular impacts, which reduces the intensity of the impact and leads to an increase in the cost of electricity.

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Claims (1)

Invention Formula A centrifugal mill containing a cylindrical body, a rotor with accelerating blades, loading and unloading nozzles, variable cross-flow spirals placed outside the cylindrical body and ending with additional loading nozzles, in order to intensify the grinding process, it is equipped with an additional rotor the form of a disk with a hollow shaft, 5 loading holes made in the disk under the loading nozzles of the spiral overflows and blockers-separators consisting of and separating portions fixed under the disc and covering the main rotor, made in 0 as a disk with a covering ring, between which curvilinear material flow stops are attached with accelerating vanes attached to them, the extreme edges of which are located on one straight line, with the striking part of the additional rotor baffle bars separating at an angle of 35-45 ° to this straight line, the separation part is along the rotor radius, the accelerating blades of the main rotor are set at an angle of 25-50 ° to the tangent, 0, conducted to the flow restrictor at the point of their attachment, between the flow restraints and the accelerating vanes in the main rotor disk, the overflow holes are made, and under the main rotor ventilation blades are mounted on its shaft. A-fi sixteen 2 Rig J Compiled by A. Rudenko Editor N. TupitsaTehred I. VeresKorrektor A. Ilyin Order 67/9 Circulation 573 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 1 13035, Moscow, Zh-35, Raushsk nab., 4/5 Production and ioligraphic enterprise, Uzhgorod, ul. Project, 4