RU110296U1 - VIBRATION MILL - Google Patents

Abstract

 A vibration mill containing a grinding chamber with nozzles for loading and unloading the grinding product and a vibration exciter, characterized in that the vibration exciter is removed down from the common center of the vibrating mass by an amount smaller than the radius of the grinding chamber, while the grinding chamber is equipped with two pairs of annular flanges made lower in shape fork grips, and the bearing assemblies of the vibration exciter at the bottom are fixed by a fastener in the gap between each pair of annular flanges.

Description

The utility model relates to machines for fine grinding of materials, namely to the device of vibration mills. Vibratory mills are used to process various materials from fine crushing to fine and ultrafine grinding of bulk materials to produce sand and various fractions of powders, as well as in the processes of mechanochemical processing of surfaces of particles of bulk materials, their homogenization, encapsulation, mechanochemical destruction, synthesis.

A known vibration mill, (patent RU 1150813 C V02C19 / 16, publ. 30.08.1994) containing a predominantly cylindrical grinding chamber horizontally mounted on elastic supports with a central pipe in it and a vibration exciter mounted in the pipe. Due to the formation of a pre-grinding cavity in the chamber, the chamber is provided with a longitudinal perforated partition mounted above the pipe in the form of a bottom of the pre-grinding cavity.

However, this vibratory mill has the following disadvantages:

- vibration exciter occupies the working space of the grinding chamber;

- the grinding mass of the balls and the initial product is clamped by the walls of the exciter.

These factors reduce mill productivity.

Known vibration mill (patent RU 2038847 Cl B02C19 / 06, publ. 09.07.1995), which is selected as a prototype. The mill contains grinding chambers with loading nozzles and vibration exciters. A through perforated pipe is installed inside the grinding chamber, inside of which a sleeve with a profiled cut is placed with the possibility of movement or rotation. The holes in the perforated pipe are uneven in length and cross section. The perforated pipe and sleeve is located misaligned, preferably perpendicular to the axis of the grinding chamber. Several perforated pipes with sleeves placed in them can be installed in the grinding chamber.

According to the drawing, presented in figure 1 of the prototype, perforated pipes and sleeves removed from them occupy a large space between the grinding chamber and the vibration exciter. Vibrational energy is generated by a vibration exciter. Its lowering and increase in the levers of attachment to the grinding chamber reduce the transformation of vibrational energy and delay it in the exciter itself, overloading the bearing assemblies and the places of their attachment to the grinding chamber by mechanical forces. The delay in the transformation of vibrational energy, overloading the attachment points of the vibration exciter to the grinding chamber itself are serious drawbacks that reduce the overall performance of the mill.

For the grinding process, it is important that the pressure forces of the balls down and to the sides are accompanied by the tangential forces of vibration of the inner walls of the grinding chamber with the balls slipping. If the center of the vibration exciter is brought closer to the grinding chamber in such a way that the design parameters of the vibration exciter itself and the grinding chamber with grinding media provide a distance between the center of the vibration exciter and the common center of the vibrating masses, it is predominantly less than the radius of the grinding chamber. In this case, the highest pressure of the balls takes place at the bottom of the grinding chamber, and, in the same place, an elliptical oscillation path with a horizontal major axis will ensure the greatest sliding of the grinding bodies and the milled product on the inner surface of the grinding chamber, while ensuring high grinding efficiency. The same condition persists on the side walls. The pressure of the balls is less - their movement is less due to the transition of the oscillation path to a circular path.

The technical task of the utility model is the creation of a vibratory mill, providing an increase in the intensity of the grinding process.

EFFECT: increased productivity of a vibratory mill.

To solve the problem in a vibration mill containing a grinding chamber with nozzles for loading and unloading the grinding product and the vibration exciter, according to the utility model, the vibration exciter is removed down from the common center of the vibrating masses by an amount smaller than the radius of the grinding chamber, while the grinding chamber is equipped with two pairs of annular flanges made below in the form of forks, and the bearing assemblies of the vibration exciter at the bottom are fixed by a fastener in the gap between each pair of annular flanges.

The increase in grinding efficiency is ensured by an elliptical trajectory of oscillations with a large horizontal axis, turning into a circular path along the sides of the grinding chamber, due to the design parameters of the grinding chamber and vibration exciter, so that the center of the latter to the general center of gravity of the vibrating masses is mainly close to the radius of the grinding chamber.

The increase in the efficiency of the grinding process is also provided by intense vibration arising due to the reliable execution of two pairs of annular flanges on the outside of the grinding chamber, made below in the form of forks, where the bearing assemblies of the vibration exciter are fixed between each pair.

The essence of the utility model is illustrated by drawings.

Figure 1 presents a vibration mill - side view; figure 2 is a section aa in figure 1; figure 3 is a section bB in figure 1; figure 4 - view In figure 1.

The basis of the vibration mill (figure 1) is a horizontal cylindrical grinding chamber 1, equipped at the top with a pipe 2 for loading the original product, a pipe 3 for loading balls (tsilpeps). From the ends one wall of the grinding chamber 1 is plugged, and the second is removable and has a pipe 4 for unloading the grinding product. On the outer walls of the grinding chamber 1 are two pairs of flanges 5 (Fig.2, 3). Moreover, in the lower part of the flanges 5 are made in the form of a forks 6 (figure 4). Between the forks of each of the pairs of flanges 5, two bearing assemblies 7 of the vibration exciter are inserted as close as possible to the wall of the grinding chamber (Fig. 1). Bearing units 7 are attached to the flanges 5 by means of fastening (bolted) connections. Between the bearing units 7 passes a shaft 8 with an unbalance 9 of the exciter. Parts 7, 8 and 9 constitute a vibration exciter.

On the loading side, a motor 10 is connected to the mill, the output end of the shaft of which and the output end of the shaft 8 of the vibration exciter are brought together by a flap clutch 11 (Fig. 1). The grinding chamber assembly with the vibration exciter is fixed in space by means of four elastic supports 12 (FIG. 2), made, for example, in the form of springs, which are connected to four brackets 13 welded to the sides of the grinding chamber. The elastic supports themselves are mounted on the fundamental frame 14.

The proposed vibration mill operates as follows. During mill operation, the vibration exciter generates circular vibrations in a vertical plane. In a vibrating system as part of the masses of the grinding chamber, balls with the grinding product and the vibration exciter, the common center of gravity is located above the center of the vibration exciter itself. For this reason, the trajectories of different points along the perimeter of the grinding chamber will be different (figure 3). At the bottom is an ellipse with a large horizontal center line, on the sides close to a circular path, and at the top an ellipse with a large vertical center line. At all points of the grinding chamber taken, the trajectory of oscillation has equal vertical axial lines. The geometric center of the vibration exciter (the central axis of the shaft) makes an elliptical trajectory with a horizontal axial line of a larger size than the same line at the trajectory of the lower point of the grinding chamber.

From the vibration exciter, vibrational energy is transmitted to the grinding chamber in relative values in proportion to the trajectories of the points of the inner surface of the grinding chamber itself. This is optimally consistent with the pressure of the balls and the grinding product on the walls. Thus, at the bottom there is the greatest pressure on the largest oscillation path, on the sides - the average pressure and the average largest oscillation path. Above, there is a very small trajectory of oscillations, and the pressure of the grinding medium is minimal or even completely absent.

Due to the combination of the grinding medium pressure at the points of the walls of the grinding chamber and the trajectories of their oscillations, a high intensity grinding process is ensured. The same contributes to the intensity of the generation of vibrations, which is provided by a reliable constructive solution for connecting the forks of the annular flanges 5 of the grinding chamber 1 with the bearing assemblies 7 of the vibration exciter (Fig. 1).

Thus, due to the optimal combination of the grinding medium pressure with the oscillation paths of the points of the inner walls of the grinding chamber and the vibration intensity that the joints of the vibration exciter and the grinding chamber are able to withstand through the annular flanges, an increase in the intensity of the grinding process and, ultimately, an increase in the productivity of the vibration mill are ensured.

Claims (1)

A vibration mill containing a grinding chamber with nozzles for loading and unloading the grinding product and a vibration exciter, characterized in that the vibration exciter is removed down from the common center of the vibrating mass by an amount smaller than the radius of the grinding chamber, while the grinding chamber is equipped with two pairs of annular flanges made lower in shape fork grips, and the bearing assemblies of the vibration exciter at the bottom are fixed by a fastener in the gap between each pair of annular flanges.