HU206280B - Method and apparatus for grinding and classifying solid material - Google Patents

Abstract

The present invention relates, on the one hand, to a process for grinding and classifying solid particulate material. In the process, the crushed and graded grain particles are sprayed into a space outlined by a stationary and rotating frame member, such as forks (4, 5), and at the same time gas, such as air, is supplied to said space (0) in different radii so as to form a swirling flow image there. and conducting the particulate gas into a self-classifying snail housing (6) surrounding said space (0). The invention also relates to a device for grinding and classifying solid particulate material, in particular for carrying out the above process. The object of the present invention is that the opposite fork (4) and rotating fork (5), the feed tank (1) connected to the stationary fork (4), and the compressed gas connected to the rotating fork (5), are connected to each other. a plurality of tubes (3) and a screw housing (6) surrounding the space (O) defined by the forks (4, 5). EN 206 280 B Scope of the description: 4 pages (including 1 sheet)

Description

BACKGROUND OF THE INVENTION This invention relates to a method and apparatus for grinding and grading solids.

The process and apparatus of the present invention can generally be used to further comminute, or to some degree classify, a set of pre-shredded solids. The invention is particularly intended to provide a fine-grained version of minerals.

Known solutions for similar purposes are usually divided into separate units, namely, separate units for shredding and separate units for grading. Grinding is generally customary in a variety of mills to provide granular fineness in the field of the present invention. Classification is mainly done using centrifugal force fields, for example cyclones or wormhole structures.

Several solutions to known shredding and screening methods and equipment are described in John H. Perry, Manual of Chemical Engineers (Technical Publisher, Budapest, 1969). 786-822. pages and text. In these devices, the crushing is mainly due to the collision between the individual parts of the apparatus and the particles to be crushed. As a result, as high-hardness solids are generally shredded, there is considerable wear to the structural details of the equipment involved in shredding, which is disadvantageous in many respects. This high degree of wear is disadvantageous because the equipment is worn out quickly and requires considerable cost for renovation and replacement of worn parts. Also, rapid wear is disadvantageous because it means that metal parts or possibly other material parts that come off the parts of the equipment end up in the shredded particle and can often be an impediment to further desired use.

The object of the present invention was to provide, as far as possible, shredding which reduces equipment wear and thus avoids both purely economic and other consequences.

The idea of the method and apparatus according to the invention is to provide, as far as possible, conditions during the crushing operation in which the collisions causing the crushing effect are manifested in a collision between the particles intended to be crushed. collision.

In the process of the present invention, the set of particles to be crushed is introduced into a space where the crushers and the particles can collide with one another while being subjected to crushing. In this space, the material to be shred is subjected to a high degree of turbulence due to the rotating shredding element and the resulting compressed gas, such as air, resulting in high energy collisions between the individual particles. Connected to the aforementioned space is a wormhole, in which the classification based on the principle known in itself and the removal of the various fractions from the apparatus can be ensured.

In the apparatus of the present invention, the particulate material to be comminuted is introduced into a space delimited or substantially delimited by a stationary mechanical system and a movable mechanical system, and at the same time the compressed gas is introduced into this space, preferably in several places, and the gas inlet directions are selected so as to produce a swirling effect, a swirling flow pattern in said space.

The essence of the process according to the invention is therefore to disperse a set of particles intended to be comminuted and graded into a space outlined by stationary and rotating frame elements such as forks and simultaneously inject gas such as air in different directions so as to produce a swirling flow pattern the particulate gas is introduced into a screening auger known per se surrounding the space in question.

It is expedient to carry out the process according to the invention by introducing the group of particles to be graded into the comminution space at several locations, essentially at the gas entry points.

The apparatus of the present invention comprises an opposing, overhanging, protruding fork and a rotating fork, a metering tank connected to a stationary fork, a plurality of tubes connected to the rotating fork, leading to a particulate material, and a screw housing surrounding the forks.

In a preferred embodiment of the device according to the invention there is provided at least a crushing element or elements attached to the rotating fork.

The apparatus according to the invention will be described in more detail with reference to the exemplary embodiment illustrated in the accompanying drawings, and a description of the operation of the exemplary apparatus will also be a detailed description of the method of the invention.

In the drawing, the exemplary equipment is

Figure 1 is a cross-sectional view, a line view, a

Figure 2 is a front view corresponding to Figure 1. This figure is essentially an illustration of a wormhole.

The aggregate of particles to be crushed is contained in the metering vessel (1) and from there flows into a non-enclosed (O) space through a through pipe. Various sheets can be attached to the substantially fork (4) to deflect the particle set for proper grain distribution.

In fact, the space (O) is delimited by said stationary fork (4) and a rotatable fork (5) movably adapted thereto. The rotating fork (5) can be driven by the shaft (7).

The crushing element (2) is mounted on the rotating fork (5) or on the stub (7) of the rotating shaft (7). This shredder element (2) is a tray-like body with teeth or arc-shaped rib bodies which, when rotated, exerts a large impact on the particles intended for shredding. Through the comminuting element (2), the tubes (3) penetrate and pass through the condensed gas, which is usually compressed air, into the space (O).

The space (O) flows into the wormhole (6), where a mixture of the high pressure gas and the particle mass used for grinding passes into the space (O). In this wormhole (6) certain fractionation is known2

EN 206 280 Β, and with the aid of suitable baffles, fractions of the desired particle size can be derived therefrom.

In the device according to the invention, various stop plates can be formed or arranged in the part of the stationary fork (4) facing the space (0).

The structural details in contact with the material to be shredded and particularly exposed to high impact may also be made of a non-metallic material, such as ceramic material, thereby preventing fine metal contamination of the shredded particulate material.

With the use of the method and apparatus of the present invention, the wear of some parts of the apparatus is less than that of conventional shredding equipment or processes. This is largely due to the fact that the particles colliding with each other in the vortex space have a high degree of shredding effect and that the collision between the structural materials and the particles is less involved.

Claims (4)

PATENT CLAIMS A method for grinding and grading solid particulate material, characterized in that the particle set to be crushed and graded is sprayed into a space outlined by stationary and rotating frame elements such as forks (4,5) and simultaneously emitted gas, e.g. air, in different radii. space (O) to form a swirling flow pattern, and the particulate gas is introduced into a well-known screening screw housing (6) surrounding said space (O). A process according to claim 1, characterized in that: 10 that the group of particles to be graded is introduced into the comminution space (O) at several locations, substantially opposite the gas entry points. Apparatus for grinding and grading solid particulate material, in particular according to claim 1 15, characterized in that the opposed standing fork (4) and the rotating fork (5), the metering container (1) connected to the stationary fork (4), connected to the rotating fork (5), multiple gas inlet pipes (3) and 20 having a worm housing (6) surrounding the space (O) defined by the forks (4, 5). Device according to Claim 3, characterized in that it comprises at least a crushing element (2) fixed to the rotating fork (5).