RU2319547C1 - Vibration mill - Google Patents

Abstract

FIELD: equipment for fine grinding of materials and homogenization of multiple-component mixtures.

SUBSTANCE: vibration mill has casing mounted in horizontal position on support by means of elastic shock-absorbers and provided with driving unbalancing vibrator and grinding chambers wherein milling cylindrical bodies are placed and which are connected to each other through chutes for transfer of material under grinding process from one chamber into the other chamber. Milling bodies are made in the form of pipes freely positioned within one another, and rod. Double radial gap B between contacting surfaces of milling chamber, pipes and rod is within the dependence: B=(0.7-1.0)2A, where A is amplitude of circular vibrations of casing.

EFFECT: increased grinding extent.

3 dwg

Description

The invention relates to grinding devices, in particular to multi-chamber vibratory mills with cylindrical grinding bodies. Most widely it can be used for fine grinding and homogenization of building mixtures, including pigments.

In vibratory roller mills, cylindrical grinding bodies are run on the walls of the cylindrical grinding chambers through a layer of recyclable material. Unlike drum and vibration ball mills, it is possible to provide forced intralayer self-grinding of the material. Therefore, the particles of the finished product have not rounded, but a comminuted shape with a developed surface, which provides increased mechanochemical activity of the aforementioned product. In addition, multicomponent feedstock is simultaneously subjected to quality homogenization.

Known vibration mill (AS USSR No. 852355 from 07/18/79), containing four elastically mounted on a common support of the housing, each of which is equipped with its own vibrator, grinding chamber and grinding cylindrical bodies. The vibrators are interconnected by gears so that with synchronous rotation, dynamic equilibrium of the system is ensured. Each camera is loaded with source material individually.

The disadvantage of the mill is the complexity of the design, as well as the difficulty of sequential loading of cameras. The degree of grinding of the mill is low.

Also known is a vibration mill (USSR AS No. 772587 dated 04/16/79), containing a housing horizontally mounted on a support through elastic shock absorbers with a drive unbalanced vibrator and grinding chambers, in which grinding rollers are equipped with a common anti-vibrator. The cameras are connected to each other by reloading chutes.

The presence of an antivibrator ensures dynamic balance of the system, however, the placement of antivibrators on the grinding rollers complicates the design and does not allow the use of more than two chambers, since with a larger number of them it is difficult to ensure reliable gap-free running of the rollers along the walls of the chambers, which sharply reduces the degree of grinding.

Known for the prototype vibration mill (AS USSR No. 559725 dated 06.24.74), comprising a housing horizontally mounted on a support through elastic shock absorbers with a drive unbalanced vibrator and grinding chambers in which grinding cylindrical bodies are freely placed and which are connected to each other estruses for inter-chamber overloading of crushed material. The mill is simple, reliable and compact, but at the same time it is characterized by low productivity and the degree of grinding due to the small working area of grinding media.

The present invention of the mill is to increase the productivity and degree of grinding.

The solution to this problem is carried out in a vibration mill containing a housing horizontally mounted on a support through elastic shock absorbers with a drive unbalanced vibrator and grinding chambers in which grinding cylindrical bodies are freely placed and which are connected to each other by chutes for interchamber overloading of the crushed material, in which, in accordance with According to the present invention, grinding bodies are made in the form of pipes and a rod freely installed in one another, with a double radial clearance B "between the contacting surfaces of the grinding chamber, the pipes, and the rod is within the relationship:

B = (0.7 ÷ 1.0) 2A,

where A is the amplitude of the circular oscillations of the body.

The structural diagram of the proposed vibration mill in longitudinal and transverse sections is shown in figures 1-3.

The mill comprises a housing 3 horizontally mounted on a support 1 through elastic shock absorbers 2 with through cylindrical grinding chambers 4 placed around the circumference of the housing 3. Complex grinding media 5 are freely placed inside the chambers 4. The housing 3 is closed on both sides by end caps 6, in which overload grooves 7 placed between the ends of the chambers.

A shaft 9 is installed in the bearings 8 of the housing 3, and unbalanced vibrators 10 are mounted at both ends of the shaft 10. The shaft 9 is connected to the electric motor 11 through a compensation sleeve 12. A receiving funnel 13 with a central partition 14 is fixed at the top of the end cover of the housing 3, and another at the bottom the end cap is mounted unloading estrus 15. Complex grinding bodies 5 (Fig.3) consist of an outer pipe 16, an inner pipe 17 with a rod 18 located inside it, and the total radial clearance "B" between their working surfaces is tsya depending

B = (0.7 ÷ 1.0) 2A,

where A is the amplitude of the housing 3.

When using a coefficient of less than 0.7, the technological effect sharply decreases due to a decrease in the grinding force, and when its value is exceeded more than 1.0, it is difficult to even run the bodies across each other, which also leads to a deterioration of technological parameters.

The mill operates as follows. The source material is loaded into the receiving funnel 13 under the bulk and thanks to the central partition 14 is divided into two equal streams, which along the reloading grooves 7 in the end caps 6 pass sequentially along the left and right row of grinding chambers 4. From the electric motor 11, the torque is transmitted to the shaft 9 through the coupling 12. When the unbalanced vibrators 10 sitting on the shaft 9 rotate, a centrifugal force is created, forcing the housing 3 to perform circular oscillations with the amplitude “A” on the shock absorbers 2. In this case, complex grinding bodies 5 receive circular vibrations along the walls of the chambers 4 through a layer of ground material. The material receives a fluidized state and, like a fluid, moves from the inlet of the chamber to its outlet and further to the inlet of the next chamber. The fluidized material also passes into the gaps between the grinding tubes 16, 17 and the rod 18, which leads to a significant increase in the grinding surface and the grinding bodies slip relative to each other, which leads to a 50% increase in productivity and degree of grinding.

The tests showed that when grinding quartz with particles of 6 mm in size, a product was obtained containing 90% of particles smaller than 3 microns with a capacity of 15 kg / h and an engine of 6 kW. Thus, the degree of grinding reaches 1500, which is impossible to implement in any of the known mills.

The mill has one shaft with symmetrical vibrators that do not require self-synchronization or special kinematic connections between each other. This determines the simplicity of the design.

Finally, the same working conditions of the chambers provide the same wear of the grinding media, which increases the stability of technological indicators.

Thus, the claimed distinguishing features ensure the fulfillment of all the tasks set in the proposed invention.

Claims (1)

A vibration mill comprising a housing horizontally mounted on a support through elastic shock absorbers with a drive unbalanced vibrator and grinding chambers in which grinding cylindrical bodies are placed and which are connected to each other for interchamber overload of the crushed material, characterized in that the grinding bodies are made in the form of freely installed one in the other pipes and the rod, while the double radial clearance "B" between the contacting surfaces of the grinding chamber, pipes and rod is in the limits of dependence B = (0.7 ÷ 1.0) 2A, where A is the amplitude of the circular oscillations of the body.

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