RU2653603C1 - Centrifugal percussion mill - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: invention relates to agriculture. Mill contains loading and unloading devices, a fixed cylindrical body, from the inner surface of which are disposed elements. Housing central section accommodates bladed rotor with self-lined pockets. In the inner volume of self-suction pockets perpendicular to the plane of the blades are located a certain step in the direction from the axis of the rotor to the periphery of the trapezoidal guide plates. Upper faces of the guide plates to the blade surface are inclined, with a decrease in the angle of inclination of the faces from the axis of the rotor to the periphery from 200 to 00°. Loading device is made in the form of coaxially installed hollow cylindrical shells. Impact elements are placed on the rotor by ring rows. Inner and outer rows are located from the center of the rotor at distances equal to the radii of the inner and outer cylindrical parts of the hollow cylindrical shells, respectively.

EFFECT: improved grinding efficiency is ensured.

1 cl, 7 dwg

Description

The present invention is intended for use in the chemical industry, agriculture, the production of building materials and other industries.

Known centrifugal impact mill [RF Patent No. 2232638, IPC V02C 7/08] consisting of a housing, loading and unloading devices, a rotor with accelerating blades, a stationary shell with windows and crushing plates. The crushing plates are fixed with an inclination relative to the vertical axis of 1-15 °. The shell may consist of inserts to control the number and size of windows.

The disadvantages of this mill include the rapid and uneven wear of accelerating blades and crushing plates during grinding of hard abrasive materials, as well as the low grinding efficiency.

Closest to the proposed invention is a centrifugal impact mill [RF Patent No. 2514716, IPC В02С 7/08], comprising loading and unloading devices, a fixed cylindrical body, on the inner surface of which there are breaker elements, and a rotor with with blades having self-lining pockets, in the inner volume of self-lining pockets, perpendicular to the plane of the blades, the guide plates are arranged with a certain step in the direction from the axis of the rotor to the periphery trapezoidal shape, and the upper faces of the guide plates to the surface of the blade are made inclined, with a decrease in the angle of inclination of the faces from the axis of the rotor to the periphery from 200 to 0 °.

The disadvantage of a centrifugal impact mill is its low degree of grinding.

The objective of the invention is the creation of a centrifugal impact mill, the design of which allows to increase the service life of the breaker elements, blades and other parts of the rotor with a high degree of grinding.

The problem is achieved in that in a centrifugal impact mill containing loading and unloading devices, a stationary cylindrical body, on the side of the inner surface of which there are breaker elements, and in the central part of the body there is a rotor with blades having self-lining pockets in the inner volume of self-lining pockets , perpendicular to the plane of the blades are arranged with a certain step in the direction from the axis of the rotor to the periphery of the guide plate trapezoidal shape, and the upper the guide plates to the blade surface are made inclined, with a decrease in the angle of inclination of the faces from the axis of the rotor to the periphery from 200 to 0 °, the loading device is made in the form of coaxially mounted hollow cylinders, and shock elements are placed on the rotor in circular rows, with the inner and outer rows placed from the center of the rotor at distances equal to the radii of the inner and outer hollow cylinders, respectively.

In FIG. 1 shows a diagram of a centrifugal impact mill.

In FIG. 2 shows a section aa.

In FIG. 3 shows a view of B.

In FIG. 4-7, guide plates 12-9 are shown, respectively.

The centrifugal impact mill contains loading devices 1 and unloading 2, a fixed cylindrical body 3. Inside the housing 3 there is a rotor 4 with blades 5. The rotor is driven by an electric motor 6. On the inner surface of the housing 1 there are installed breaker elements 7. Self-lining pockets are made in the blades 5 8, in which the guide plates 9-12 are mounted. To direct the material to the unloading device 3, blades 13 are mounted on the shaft. The loading device 1 is made in the form of coaxially mounted hollow cylindrical shells 14 and 15. On the rotor 4, the shock elements 16 are placed in annular rows, the inner and outer rows of the shock elements being located from the center of the rotor at distances equal to the radii of the inner and outer cylindrical parts of the hollow cylindrical conical shells, respectively.

Centrifugal impact mill operates as follows.

The material to be crushed is fed from the loading device 1 through the annular gap between the surfaces of the hollow cylinders 14 and 15 to the rotating rotor 4 into the zone of placement of the shock elements 16. When the particles of the material interact with the shock elements, they are preliminarily ground.

Due to the fact that the loading device is made in the form of coaxially mounted hollow cylindrical-conical shells, the crushed material is supplied not to the central part of the rotor, where the speed is close to 0 and long acceleration of particles is required, but to zones with sufficiently high speeds.

In these sections of the rotor, the annular rows are placed shock elements, which during its rotation have speeds sufficient for preliminary destruction of the particles necessary to improve the quality of grinding.

Placing the inner and outer rows of the shock elements at distances equal to the radii of the inner and outer cylindrical parts of the hollow cylindrical shells, respectively, allows for a collision with the largest number of particles.

Next, pre-crushed particles are captured by the blades 5, under the action of centrifugal forces move from the center of the rotor to the periphery and are scattered. The sparse flow of solid particles strikes the stationary fenders 7, evenly spaced along the inner surface of the housing 3. During impact interaction with the fenders, they are destroyed with the formation of a polydisperse flow. The finished product is unloaded through the unloading device 3, for example, using the blades 13.

To prevent wear of the surfaces of the blades on their working surfaces made self-lining pockets 8, which when the mill is filled with material and prevent wear of the blade.

A decrease in the wear rate of the baffle elements is achieved by the formation of an oncoming particle stream with a uniform distribution over the height. During the shock interaction of such a flow with the chipping organs, the wear rate is significantly reduced and wear is uniform over the entire height of the chipping element.

A layer of material uniform in height in the final part of the blade is achieved by placing guide plates 9-12 in the self-lining pockets. When filling the pockets with material, the guide plates form a layer of variable thickness. When capturing material at the beginning of the blade, guide plates 12 are installed with an angle of inclination of the upper face (relative to the surface of the blade) of 200 °. This form allows you to get an inclined fixed layer relative to the surface of the blade, when moving along which the material under the action of pressing forces begins to rise along the surface of the blade (in the transverse direction). The angle of inclination of the subsequent guide plates 11 and 10 is 100 and 50, respectively, and the last guide plate 9 has a rectangular shape. This arrangement of the guide plates makes it possible to obtain a self-lining layer of variable thickness, when moving along which the moving material is gradually distributed over the entire height of the blade with a uniform layer. Formed dispersed flow also has a uniform concentration of particles along the height. Thus, a uniform flow of material interacts with fenders. At the same time, the wear depth of the baffle plates is almost uniform, without local potholes. With such an organization of impact interaction, the wear rate decreases due to an increase in the working surface of the chippers.

The proposed centrifugal impact mill with high grinding efficiency can increase the life of expensive working bodies.

Claims (1)

A centrifugal impact mill containing loading and unloading devices, a fixed cylindrical body, with breaker elements located on the inner surface side, and a rotor with blades having self-lining pockets located in the central part of the casing; in the direction from the axis of the rotor to the periphery, the guide plates are trapezoidal, and the upper faces of the guide plates to the surface of the blades The parts are made inclined, with a decrease in the angle of inclination of the faces from the axis of the rotor to the periphery from 200 to 0 °, characterized in that the loading device is made in the form of coaxially mounted hollow cylindrical shells, and shock elements are placed on the rotor in circular rows, the inner and outer rows being placed from the center of the rotor at distances equal to the radii of the inner and outer cylindrical parts of the hollow cylindrical conical shells, respectively.

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