SU1480875A1 - Rotor-type mill - Google Patents

Abstract

This invention relates to a technique for grinding materials of low hardness and can be used in the regenerative industry. The purpose of the invention is to increase the degree of grinding. The mill contains a rotor mounted on the vertical shaft with radial knives 4 in the form of vertical zigzag ribs, the vertical outer edges 5 of which are radial cutting elements, and the lower zigzag edges located in the horizontal plane are face-shaped. The latter interact with rectilinear radial anvils 6, located in the same horizontal plane. There are counterblades 7, which are bridges between the holes 8 of the perforated cylinder 9, forming an additional grinding chamber, mounted coaxially with the rotor 3 inside the grinding chamber 10, the inside surface of which is made along a spiral turn. The radius of the outer surface of the perforated cylinder 9 is equal to the initial radius of the spiral turn of the chamber 10, and the loading nozzle 12 is located tangentially to its wall 11. The raw material is fed through the nozzle 12 into the grinding chamber 10 and through the holes 8 enters the zone of interaction of the cutting edges 5 with counterplays 7 where the first grinding stage occurs. In zigzag channels, under the action of aerodynamic forces, particle size classification occurs. The number of classification cycles is equal to the number of zigzags. Larger particles under the force of gravity settle down, where they are crushed under the influence of the end edges "a" of knives 4 and counterblades 6. When particles are crushed to a size at which the aerodynamic force of the air flow directed towards the center exceeds the centrifugal force, they are carried away discharge pipe 13. 5 Il.

Description

The invention relates to the technique of grinding materials of low hardness, such as elastomers, and can be used in the regeneration industry.

The purpose of the invention is to increase the degree of grinding.

FIG. shows a rotary mill, vertical section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 — rotor, section along the rotation axis; in fig. 5 is a view of B in FIG. four.

The rotor mill comprises a rotor 3 mounted in a housing 1 on a vertical shaft 2 with knives 4 in the form of vertical zigzag edges, the vertical outer edges 5 of which are radial cutting elements, and the lower zigzag edges located in the horizontal plane are face-shaped. The face cutting elements a interact with the rectilinear radial anvils 6 located in the same horizontal plane on the bottom of the grinding chamber. The radial cutting elements 5 interact with the counter blades 7, which are jumpers between the holes 8 of the perforated cylinder 9 (Fig. 1), forming an additional grinding chamber mounted coaxially to the rotor 3 inside the grinding chamber 10, the inner surface of which is made along a spiral turn.

Performing the inner surface of the grinding chamber in a spiral turn, and an additional chamber in the form of a perforated cylinder, whose radius is equal to the radius of the initial spiral turn, allows the source material to be fed into the grinding zone from the periphery to the center evenly around the circumference of the perforated cylinder and, accordingly, uniform load distribution on the working bodies. In this case, the cross section of the chamber varies from the maximum at the point of tangential connection to zero at the end of the coil, which eliminates the useless circulation of the starting material in the chamber and ensures that it is forced into the zone of interaction between the knives and the counter knife.

Making the rotor blades in the form of vertical zigzag ribs, forming a system of rotating radial zigzag ducts, makes it possible to classify the mill product by size in the field of centrifugal forces and return the coarse fraction to grinding. The radius of the outer surface of the perforated cylinder 9 is equal to the initial radius of the coil of the chamber 10 spiral.

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The feed inlet 12 is located in the center of the cylinder 9 and there is a discharge inlet 13 in the center of the cylinder 9.

The mill works as follows.

The source material, for example, rubber crumb, is fed by air through pipe 12 into the grinding chamber 10 and through holes 8 of the perforated cylinder 9 enters the zone of interaction between the cutting edges 5 of the rotor blades 4 and counterblades 7, where the first grinding stage takes place, and is carried further to the discharge pipe 13, in a zigzag rotating channel between the blades 4. In the zigzag channel, under the action of the aerodynamic forces of the air flow and centrifugal forces, particle size classification occurs. The number of classification cycles is equal to the number of zigzags. In the zone of equilibrium between the air pressure force and the centrifugal force, the large particles settle under the force of gravity and fall into the plane of interaction of the end edges of the knives 4 with the counter-tools 6, where an additional grinding stage takes place. When particles are ground to a size where the aerodynamic force of the air flow directed toward the center exceeds the centrifugal force, they are carried into the discharge nozzle. The particle size of the finished product depends on the rotor speed, which determines the magnitude of the centrifugal force, and the air flow, on which the centripetal aerodynamic force depends.

Thus, an increase in the degree of grinding is ensured by the classification of the mill product in the field of centrifugal forces of the rotor and the final grinding of the coarse fraction.

Claims (1)

Invention Formula A rotor mill comprising a housing with a grinding chamber, a rotor with radial knives, anvils, a loading and unloading nozzle, characterized in that, in order to increase the grinding degree, the inside surface of the grinding chamber is made in a spiral turn, and an additional grinding chamber is mounted coaxially to the rotor a perforated cylinder with a radius equal to the initial radius of the spiral turn and counterfins on its inner surface, while the radial knives have the shape of zigzag ribs, and first nozzle arranged tangentially. with about, 00 SP I i Sl om d  / v / i Os. (TG T & L I X o OS Sp . one -. -, CIQ I B FI.5