SU1763014A1 - Vibrating mill - Google Patents

Description

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(21) 4812254/33 (22) 09.04.90 (46) 09/23/9.Buly№№35

(71) Artem Dnepropetrovsk Mining Institute and Institute of Materials Science Problems of the Ukrainian Academy of Sciences Academy of Sciences

(72) V.P.Franchuk, A.G.Kukhar, L.I. Larina, G.G.Karyuk, E.I. Moshkovsky and A.I. Pavlenko

(56) USSR author's certificate No. 607586, class B 02 C 19/16, 1976. (54) VIBRATION MILL

(57) Use: The vibration mill relates to devices for fine grinding of abrasive materials, in particular, artificial diamonds, and can be used in the chemical, construction industry and other areas of national economy, where the need arises to obtain a fine fraction of a specific composition. SUMMARY OF THE INVENTION: The grinding chamber casing in the upper and lower parts has slots connected by an overload channel, the discharge port has inlet side holes and is fixed along the axis of the chamber, and the bottom of the chamber is made in the form of a truncated cone with a central hole, freely seated on the discharge port and equipped with a movement mechanism. In this case, the smaller base of the truncated cone is directed toward the grinding bodies and is connected to the casing by an elastic membrane. 4 il.

The invention relates to devices for ultrafine grinding of abrasive materials, in particular artificial diamonds, and can be used in the chemical, construction industry and other areas of the national economy, where the need arises to obtain a fine fraction of a specific composition.

The known vibration mill (AS No. 227833, Vl.28.03.67 of the publication of the official bulletin No. 30, 1968), which includes a vibration exciter, elastic elements, a grinding chamber divided by perforated partitions into working sections, partially filled with milling bodies, loading and unloading nozzles. The vibration exciter is made in the form of an inertial vibrator.

A disadvantage of the known mill is the low efficiency and reliability of operation during superfine grinding, caused by the action of pumping and convection effects (V.A. Chlenov, N.V. Mikhailov Vibro-slug layer, M., Nauka - 1972, p.45-62) as well as low power consumption, and, consequently, low specific performance associated with the use of an inertial vibration exciter.

The closest (prototype) to the technical essence, the design and the achieved result is a vertical vibratory mill (A.S. № 607586, vl.1 .10.76, publ.24.04.78), including the vibration exciter, elastic elements, grinding chamber, divided by perforated partitions into working sections, partially filled with grinding bodies, loading and unloading pipes. Tubes are used for the continuous supply of the source material and the discharge of crushed proVI

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duct located respectively at the top and bottom of the grinding chamber. In the grinding chamber there is no conical bottom and the pipes are not connected to each other by a channel.

An eccentric vibration exciter is used in the mill, which makes it possible to increase the energy intensity in the grinding zone and, consequently, the specific efficiency.

The disadvantages are: low efficiency and reliability during superfine grinding, due to the fact that this design does not allow to obtain a fine fraction of the material to be crushed, because when the loading nozzle is located on top, the source material, passing through it into the grinding chamber, is crushed, the passage under the action of gravitational forces through the working sections and unloading in the lower part through the discharge pipe, the passage thus only one grinding cycle, while for Obtaining a fine fraction requires repeated repetition of this cycle.

At the same time, in the grinding chamber, there is a disturbance in the uniform distribution of the material being crushed throughout the chamber volume in the inter-ball space, caused by the action of pumping and convection effects, which are directed vertically upwards and creates resistance to the normal movement of the material being crushed downwards and leads to clogging of the working sections.

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

This goal is achieved by the fact that in the proposed construction of a vibrating mill containing a vertically installed grinding chamber divided into sections by perforated partitions, a loading nozzle and a discharge device, the grinding chamber is equipped with an external leakage section installed outside, and the outer sections of the upper and lower sections are made with slots, communicating with each other through the chute, in which the loading nozzle is installed above the level of the lower section; The mill loading device is made in the form of a valve with a neck and a central outlet, which is connected to the chamber wall under the lower section by an elastic annular membrane, interacts with a valve seat under the bottom partition and is controlled by a valve lifting-lowering mechanism.

The presence of gaps in the upper and lower parts of the housing and the overflow chutes ensure a constant circulation of the material being crushed to obtain a finished product of a certain size, preventing clogging of the working sections of the chamber, promoting uniform distribution of the material being crushed throughout the grinding chamber, which increases efficiency and reliability of the mill with ultrafine grinding.

Making the bottom of the grinding chamber in the form of a truncated cone formed by an elastic membrane with a valve, directed 15 with a smaller base towards the grinding bodies, ensures the most efficient process of transporting the material to be ground up, which is confirmed by experimental testing, with

This central hole, made in the housing, serves to fit the bottom on the discharge port, and the movement mechanism ensures its mobility in the vertical plane, which increases

5 the efficiency of the unloading process, since it is fixed in the lowest position, it opens the side inlets of the discharge pipe, ensuring that the finished one arrives to it

0 material. Fixing the loading nozzle along the axis of the chamber is necessary to ensure the mobility of the bottom when it is moved in the vertical plane. Elastic membrane bonding

5 the bottom of the grinding chamber with the housing ensures the sealing of the bottom and its mobility in the vertical plane, which increases the reliability of the unloading process while preventing the loss of the finished product.

Thus, the design of the grinding chamber allows to ensure the efficiency and reliability of the processes of feeding, grinding and unloading materials during

5 superfine grinding.

No other known solutions with features similar to those distinguishing the proposed solution from the prototype were found by the applicant, and therefore it should be considered that the solution has significant differences and novelty.

FIG. 1 shows a general view of the vibration mill; 2 is a section A-A in FIG. one; fig.Z - grinding chamber; figure 4

5 is a lower part of the grinding chamber body. The vibratory mill contains an eccentric vibration exciter 1 mounted with elastic elements 2 on frame 3 and connected with clutch 5

with electric motor 6. Grinding chambers

4 is attached to the brackets of the vibration exciter 7 by means of the crosspiece 8 and consists of a body 9 divided by perforated partitions 10 into working sections partially filled with grinding bodies 11. The camera body 9 in the upper and lower parts has slots 12 connected by overflow leakage 13. Slots in the upper part they are located at the level of the layers of grinding bodies, while the width of the slits is smaller than the diameter of the grinding bodies. The cracks in the lower part of the body are located at the level of the loading cavity 17 formed by the conical bottom 18 and their width corresponds to the width of the overflow chute 13.

The boot nozzle 14 is installed at the bottom of the overflow chute 13 above the level of the lower section in the camera body. The discharge pipe 16 is fixed on the axis 15 is fixed and has inlet holes in the upper part. The unloading valve of the chamber 18 is made in the form of a movable truncated cone with a central bore, which is freely seated on the discharge port 16. The taper of the valve depends on the parameters of the camera operation mode (amplitude and oscillation frequency) in the range from 45 ° to 80 °. The valve 18 is equipped with a lifting-lowering mechanism, including the upper 21 and lower 22 nuts, which fix the lower and uppermost position of the valve 18. The elastic membrane 19, which seals the valve 18, is attached to the valve neck on one side and to the flange on the wall of the grinding chamber. 20 in its lower part - on the other hand.

The operation of the vibratory mill is as follows.

The rotation from the electric motor 6 through the elastic coupling 5 is transmitted to the vibration exciter 1. The latter informs the grinding chambers 4 on a straight line trajectory in a vertical plane. The source material in a volume dependent on the volume of the grinding chamber through the loading nozzle 14 enters the overflow estrus 13 and further under the action of gravitational forces through the lower slots in the grinding chamber body enters the loading cavity 17. At the same time, the conical valve 18 is in the extreme upper position and tightened with a nut 21. With vertical vibration, a phenomenon occurs in the grinding chamber body, known as the pumping effect, caused by the movement of the grinding bodies. Under the action of these forces, the comminuted material is transported through the perforated perforated recesses 10 into the inter-ball space.

working sections and its uniform distribution throughout the chamber. The effect of the pumping effect is enhanced as the material shreds. In addition to pumping

effect during the operation of the mill in the grinding chamber body, with its vertical arrangement, the convection effect is also manifest, since

Intensive heating of the grinding media and an upward flow of heated air is formed, which carries up the particles of the comminuted material.

Pass through the layers of the grinding bodies of all

working sections, grinding material through the upper slit 12 in the camera body enters the overflow chute 13 and then through the lower slit in the camera body again enters the loading cavity 17.

Thus, the material to be ground is circulated in the grinding chamber for a certain period of time necessary to obtain a finished product of a certain size.

After a certain time has elapsed, the mill is turned off, the cone valve 18 is fixed in its lowest position with the help of a nut 22, thus opening the inlets of the discharge port

16, ensuring the receipt of the finished material. When this membrane 19 forms a conical surface with a taper, the reverse taper of the valve. The material is unloaded while the mill is in operation, which makes it possible to clean the grinding media from the material being ground.

In this way, the efficiency and reliability of the vibratory mill is ensured during ultra-fine grinding.

For the purpose of experimental verification, a sample of the MBV-0.15-3 vibration mill was developed.

The proposed design has the following advantages over the prototype:

allows to use the effects of pumping and convection effects during ultra-fine grinding to ensure optimal concentration of the crushed material in the inter-ball space of the working sections of the grinding chamber throughout the volume, thereby eliminating clogging of the working sections and increasing the efficiency and reliability of the grinding process;

allows to obtain a finer grinding product;

prevents the loss of the finished product during the unloading process.

Claims (1)

Vibration mill comprising a vertically mounted grinding chamber with intersection perforated partitions, a loading nozzle and a discharge device, characterized in that, in order to increase the degree of grinding, it is equipped with an overflow chute installed outside the chamber, and the outer walls of the upper and lower sections 0 The sections of these sections are made through the chute, while the loading nozzle is installed in the chute above the level of the lower section, and the unloading device is made in the form of a valve with a neck and an outlet, an elastic annular membrane connecting the neck to the chamber wall below the bottom section, saddles under the lower bulkhead and valve lifting-lowering mechanism. S 5 VF / fig.Z Fiel