SU1584997A1 - Mill - Google Patents

Abstract

The invention relates to vibration grinding to a high degree of dispersion and can be used in the construction, energy and other industries. The invention makes it possible to increase the efficiency of the process of grinding fine materials due to the intensification of the movement of the grinding load. For this, in a mill with a grinding chamber (PC) 1 with rotational supports (RH) 2 installed eccentrically relative to the axis of rotation, the PC and RV axes are located at a distance equal to or close to the radius of the PC, and the loading and unloading grids 8 are set to the periphery of the end walls of the grinding chamber. 2 Il.

Description

FIG. one

3158 97

This invention relates to vibration.

This material can be crushed to a high degree of dispersion and can be used to produce fine materials in the construction, energy, metallurgy, mining, as well as pharmaceuticals, powder metallurgy, and other branches of the national economy.

The purpose of the invention is to increase the efficiency of the grinding process of fine materials due to the intensification of the movement of the grinding load.

FIG. 1 shows a mill, a longitudinal section; in fig. 2 is the same cross section with intermediate positions of the grinding chamber;

In the latter case, the probability of a burst of milling bodies from the inside of FIG. 3 and k - schemes of acting forces. camera surfaces followed by sou

25

thirty

The mill consists of a grinding chamber 1, rotation supports 2, covering the trunnions 3 of the grinding chamber 1, and a drive consisting of motor A and gears 5 and 6. The internal volume of the grinding chamber 1 is loaded with grinding bodies 7. The trunnions 3 are located relative to the axis of the grinding chamber 1 with an eccentricity f and equipped with discharge and loading gratings 8, mounted on the periphery of the end walls of the grinding chamber.

The mill works as follows.

From drive motor k, rotation $ through gears 6 and 5 is transmitted to grinding chamber 1. Lastly rotating around axis 0 on trunnions 3 mounted in rotation supports 2 with eccentricity f, drives grinding grinding 7. Inside eccentrically rotating grinding chamber 1 The main forces affect the grinding bodies (Figs. 2 and 3): centrifugal force 1., m КЛ2 (evenly distributed on the inner surface and pressing the grinding load and grinding material pressed against it), inertial force from the eccentric circular movement Fa mЈ L2 (directed from the axis of rotation to the axis of symmetry of the grinding chamber) and the strength of the thimble F3 mg, always directed vertically. The sum of the last two forces determines the resultant vector, the rotation of the grinding chamber relative to which realizes the mechanics of the movement of the grinding load, similar to rotating drum mills.

the donation and destruction of the particles of the material being grinded is significantly higher, since the forces F, and Ug are periodically opposed. The ratio of these forces essentially depends on the ratio of the radius R and the eccentricity of placement Ј of the molar chamber 1. At R, the force Ug has little effect on the mechanics of grinding media so that, as in the case of rotary drum mills, the speed

rotation:

i- g

40

(kPri R «Ј, the force FJ prevails on the centrifugal one, the separation of the grinding bodies can occur at any point without providing the necessary reserve of potential energy in the field of gravity. Pr R $ the mechanics of drum mills remain. Moreover, the critical speed value is much less oi

45

is limited

and periodically

50

fluctuations in the magnitude and direction of the resultant vector (F3) co3flaiO of the prerequisite for intralayer moving the grinding load, which is in temporary contact with the surface of the grinding chamber, which increases the efficiency of the grinding process.

The grinded material enters one of the trunnions of the 3 mills, passes through the layer of the grinding load 7 and is crushed due to the intensive friction of the grinding bodies 7 and their collisions between them. The ground material is discharged through pin 3, located

If the vector of inertia forces V rotating at angular velocity I modulo exceeds the force of gravity F3, then the resulting force vector performs non-uniform periodic rotation with the same average angular velocity, then overtaking, it is late in relation to the vector F2. With

In this way, the magnitude of the resulting force varies periodically in the range (mpgf2 + + mg) - (tn Јft2 - m-g). When | F2 | mЈfl2 m-g the resultant vector oscillates around the vertical, while

while the grinding chamber is rotated relative to it at the speed of I.

In the latter case, the probability of the separation of the grinding media from the inner surface of the chamber, followed by

the donation and destruction of particles of the comminuted material is significantly higher, since the forces F, and Ug are periodically opposed. The ratio of these forces essentially depends on the ratio of the radius R and the eccentricity of the placement of the grinding chamber 1. At R Ј the force Ug has little effect on the mechanics of the grinding bodies, so that, as in the case of rotating drum mills, the speed is very limited

rotation:

i- g

(kPri R «, the force F.J prevails over the centrifugal one, the grinding bodies can be torn off at any point without providing the necessary potential energy in the field of gravity. At R $, the mechanics of drum mills remain. Moreover, the critical speed is much less than oi-

is limited

and periodic

variations in the magnitude and direction of the resultant vector (F3) co3flaiOT are prerequisites for intra-layer movements of the grinding load, which is in temporary contact with the surface of the grinding chamber, which increases the efficiency of the grinding process.

The grinded material enters one of the trunnions of the mills 3, passes through the layer of the grinding load 7 and is crushed due to the intensive friction of the grinding bodies 7 and their collisions among themselves. The ground material is discharged through pin 3, located

at the opposite end of the grinding chamber 1.

Installing the loading and unloading grids 8 on the periphery of the end walls of the grinding chamber 1 provides a rigid interface between the entrance and exit of the mill with accessories and full use of the living section of the outlet

and an increase in the residence time of the comminuted material in the active comminution zone.

The technical advantages of the proposed mill design in comparison with the prototype are the high intensity of the movement of the grinding load due to the additional inertial forces directed parallel to the tangent to the surface of the grinding chamber; improving the performance of the mill for the output of the finished fine material; reduction of capital costs by reducing the size (production facilities I

-, d Formula

581 9976

spad) more productive mills and reduce their cost; reduction of operating costs (reducing the number of units and simplifying their design); the small size of the discharge opening and the discharge of the material over the entire height of the layer.

Formula

of the invention, a mill mounted eccentrically relative to the axis of rotation, a grinding chamber with rotational supports, a loading and unloading grating drive, characterized in that, in order to increase the efficiency of the grinding process of fine materials, due to the intensification of the grinding load, the grinding chamber axis and rotational supports at a distance equal to or close to the radius of the grinding chamber, with the loading and unloading grids mounted on the periphery of the end walls of the grinding chamber Ery.

fie. 2

Fftn $ tf

-V-

Fy

Claims (1)

The claims containing a grinding chamber mounted eccentrically relative to the axis of rotation with rotation bearings, loading and unloading grids, 15 drive, characterized in that, in order to increase the efficiency of the grinding of fine materials due to the intensification of the movement of the grinding load, axis 20 of the grinding chamber and supports the rotations are located at a distance equal to or close to the radius of the grinding chamber, and the loading and unloading gratings are installed on the periphery of the end walls along molar chamber. FIG. 2 Fp? 3i FIG. 3 FIG. 4