RU86119U1 - MULTI-CHAMBER MILL WITH GRINDING ELEMENTS - Google Patents

Abstract

A multi-chamber mill with grinding elements, which is a vertically mounted steel structure, equipped with a drive and consisting of chambers fastened by the ends, separated by perforated partitions, with grinding elements or bodies placed in the chambers, while the mass of grinding elements and the dimensions of the holes of the perforated partitions in each of the above chambers more than in the downstream chambers, characterized in that the mill drive is made in the form of an unbalanced vibrator, and the lower perforated regorodka provided with a metal screen with orifices.

Description

The utility model relates to the field of grinding solid bodies, namely, devices for grinding using grinding elements, and can be used for grinding coal, ores, cement raw materials and other natural and artificial mineral materials.

Known vibration cone and jaw crushers (Vibration disintegration of solid materials. M., "Nedra", 1992, S. 259, 300). Crushers are equipped with vibratory drives, in particular unbalanced or self-balanced vibrators. In cone crushers, the working tools are cones of mechanically strong and wear-resistant materials for jaw crushers - cheeks. Under the influence of vibrations, cones or cheeks move relative to each other, crushing and abrading solid material. Vibratory crushers are productive and economical, since the grinding of solid material occurs mainly due to the impact of shock loads on it.

The disadvantage of vibration crushers is the low degree of grinding of the material (the size of the crushed particles is 3-5 mm).

Known drum mills with grinding (grinding) elements (bodies), in particular ball and rod (Mountain Encyclopedia. T.1, M., 1984, p.200-201; T.Z., M., 1987, p.299- 302). A drum mill is a horizontal rotating cylinder or drum loaded with grinding elements - balls, rods or celbeps from mechanically durable wear-resistant material, such as cast iron, steel of mineral material. The ends of the drum are closed with loading and unloading caps. When the drum rotates, the grinding elements under the influence of centrifugal force, as well as friction between themselves and the drum wall, rise to a certain height, fall, breaking and abrading the material in the drum.

Disadvantages of a drum mill: low productivity and high energy consumption due to over-grinding of a part of the material, a large variation in the size of fractions of the crushed material.

Known multi-chamber mills with grinding elements, in particular two-chamber and three-chamber (see, for example, "Grinding cement raw materials and clinker." Proceedings of the Institute of Cement, issue 36, p.5, M., 1976. Prototype). The multi-chamber mill is a vertically mounted steel cylindrical structure equipped with a rotation drive. It consists of chambers fastened with ends, filled with grinding elements. As grinding elements use balls, rods and celbeps from mechanically durable wear-resistant material. For example, in a three-chamber mill, rods or large balls are placed in the upper chamber, medium-sized balls in the middle chamber, and small balls or celbepses in the lower chamber. The cameras are separated from each other by perforated partitions. Moreover, the mass of each of the grinding elements and the size of the holes in each of the above chambers is greater than in the lower chambers. The grinding of solid material occurs mainly due to the friction of the grinding elements between themselves and with the walls of the chambers, since with a smooth rotation of the mill the number of collisions between the grinding elements is small, and the impact of the grinding elements on the material particles is small. A significant advantage of a multi-chamber mill over a conventional drum mill is that the particles of material are not crushed, and when they reach a certain size through the holes of the perforated baffle, they enter the downstream chamber, where the grinding process continues.

Disadvantages of a multi-chamber mill with a rotational drive: relatively low productivity with sufficiently large energy costs. This is because the grinding of the material occurs mainly due to abrasion, and not its crushing.

The task: to increase the productivity of the mill and reduce energy costs for grinding material.

This problem is solved as follows. In accordance with the prototype, a multi-chamber mill with grinding elements is a vertically mounted steel structure equipped with a drive. It consists of chambers fastened by the ends, separated by perforated partitions. Grinding elements are placed in the chambers. In this case, the size of the holes of the perforated partitions in each of the upstream chambers is larger than in the downstream chambers. According to a utility model, the mill drive is designed as an unbalanced vibrator, and the lower perforated partition is equipped with a metal sieve with calibrated holes.

Further, the essence of the utility model is illustrated by the drawing, which schematically shows the design of a three-chamber mill with grinding elements.

The design of the mill.

The mill is a vertical steel structure mounted on a shock-absorbing base 1 having an opening 2 for removing crushed material. It consists of chambers fastened by the ends, including the upper one - 3, the middle one - 4 and the lower one - 5. The chambers 3, 4 and 5 are separated by perforated partitions, including the upper one - 6, the middle one - 7 and the lower one - 8, and the lower partition 8 is equipped with a metal sieve 9 with calibrated holes. Chambers 3, 4 and 5 are filled with grinding elements, in particular, the upper chamber 3 is filled with rods 10 or large balls, the middle one is filled with 11 medium sized balls, the lower one is filled with 5 small balls 12 or celps. The size of the holes of the perforated partitions 6, 7 and 8 in each of the above chambers is larger than the lower - located chambers. The mill is equipped with a vibratory drive in the form of an unbalanced vibrator 13, which is installed in its upper part. The upper chamber 3 has a loading hole 14 for loading the mill with crushed material.

Preparation of the mill for work.

When preparing the mill for work, perform the following steps:

- on the base 1 lay the lower perforated partition 8, then a metal sieve 9, install the lower chamber 5, which is fastened to the base 1. The chamber 5 is filled with small balls 12 or celbeps;

- on the end of the lower chamber 5, the middle perforated partition 7 is laid on which the middle chamber 4 is installed. The lower 5 and middle 4 chambers are fastened together, and the middle chamber 4 is filled with medium-sized balls 11;

- on the end of the middle chamber 4, the upper perforated partition 6 is laid, on which the upper chamber 3 is installed. The chambers 4 and 3 are fastened together, and the upper chamber 3 is filled with grinding elements - in this case, rods 10 or large balls;

- in the upper part of the mill install unbalanced vibrator 13.

Mill work

Through the feed hole 14, crushed material is poured and an unbalanced vibrator 13 is turned on. In this case, the walls of the chambers 3, 4 and 5 and the perforated partitions 6, 7 and 8 begin to oscillate. Along with them, the grinding elements 10, 11 and 12 also receive oscillatory movements. These elements, colliding with each other, as well as hitting the walls of the chambers 3, 4 and 5 and the perforated partitions 6, 7 and 8, crush and grind the crushed material. Upon reaching a certain size of the material particles under the action of vibration and gravity through the holes of the perforated partitions, they first enter the chamber 4, then into the chamber 5, in which the grinding process continues. Due to the fact that the lower perforated partition 8 is equipped with a steel metal sieve 9 with calibrated holes, the particle sizes of the crushed material differ little from each other. The crushed material sifted through a sieve 9 using a conveyor belt (not shown in the drawing) through the opening 2 in the base 1 enters the storage hopper.

Thus, the multi-chamber design of the mill eliminates over-grinding of the material, makes it more uniform, and in combination with the impact of the grinding elements on the particles of the material accelerates the grinding process and makes it more economical in terms of energy costs.

In order to determine the effectiveness of a multi-chamber mill with a vibratory drive, an experimental two-chamber mill was developed with a drive in the form of an unbalanced vibrator and grinding elements - balls. The main parameters of the structural elements of the mill:

- the diameter of the chambers is 800 and 600 mm and the heights of 700 and 300 mm, respectively;

- the diameter of the holes of the perforated upper partition is 8 mm, the lower partition is 6 mm.

- the size of the holes of the metal sieve is 0.63 microns;

- diameter of large balls - 60 mm, small balls - 15 mm.

Tests of the vibration mill proved that, compared with a conventional drum mill with a rotation drive, the inventive version of the vibration mill has the following technical and economic advantages:

- volumetric productivity increased by two orders of magnitude, and energy consumption decreased by 4 times;

- the size dispersion of fractions of the crushed material decreased from 90 to 10%;

- the metal consumption of the vibratory mill decreased by more than 10 times. The technical result of the utility model: increasing the productivity of the mill, reducing energy costs for grinding material.

Claims (1)

A multi-chamber mill with grinding elements, which is a vertically mounted steel structure, equipped with a drive and consisting of chambers fastened by the ends, separated by perforated partitions, with grinding elements or bodies placed in the chambers, while the mass of grinding elements and the dimensions of the holes of the perforated partitions in each of the above chambers more than in the downstream chambers, characterized in that the mill drive is made in the form of an unbalanced vibrator, and the lower perforated regorodka provided with a metal screen with orifices.