RU2147931C1 - Vibratory rotary ball mill - Google Patents

Abstract

FIELD: fine grinding of materials. SUBSTANCE: vibratory rotary ball mill has cylindrical drum mounted in bearing supports for rotation on movable vibroplate located on spring-loaded support on fixed base. To ensure continuous process of vibratory rotary grinding, mill is provided with loading unit ensuring optimal filling of drum with milling bodies and material to be ground. Provision is made for elimination of stagnant zones in drum due to smooth distribution of material to be ground over entire volume of drum and due to best use of working volume of grinder. EFFECT: enhanced efficiency of milling. 3 dwg

Description

 The invention relates to mechanical grinding equipment of various industries, designed for fine grinding of materials, including metal chips, and can be used in mining, chemical, construction and other industries, as well as in powder metallurgy.

 Known drum ball mill containing a rotating drum, inside of which there are grinding bodies - steel balls. When the drum rotates, the balls roll, rise to a certain height due to the friction forces and fall, thus grinding the material between the balls and the body (1).

 The disadvantage of this design is the low grinding efficiency, since the kinetic energy of the balls is small, because it depends on the speed of rotation of the drum, and it is limited. To achieve the desired grinding, a considerable time is required for the material to be in the production zone, and this leads to increased energy consumption. In addition, grinding in this mill is most effective when filling the drum with material and grinding media by 45% of the total internal volume of the drum, i.e. the working volume of the grinder is not fully used.

 Known vibratory rotary ball mill containing a cylindrical drum with grinding media, the housing of which is rigidly connected with springs and an unbalanced vibration exciter located outside the drum (2).

 The disadvantage of this mill is the formation of stagnant zones in the apparatus, which are formed due to differences in the bulk density of the starting and ground material. When grinding, the material settles in the lower part of the drum, and grinding occurs in the lower layer of balls. Grinding is difficult because the balls are in a denser material to be crushed, while the amplitude of the oscillations of the balls decreases. In turn, the upper layers of the balls do not do useful work - hence the low grinding efficiency.

 The objective of the invention is to increase the intensity of the grinding process.

 This problem is solved by the fact that in a vibratory rotary ball mill containing a cylindrical drum with grinding bodies, the housing of which is rigidly connected to springs and an unbalanced vibration exciter located outside the drum, the latter is mounted in bearing supports on a movable vibrating plate with the possibility of rotation around its own axis using a separate drive , for the implementation of a continuous process of vibro-rotary grinding, the drum is made with an end cap, stationary relative to the drum body, into a cat swarm above the axis of rotation of the drum is fixed hopper.

 In FIG. 1 shows a general view of a vibratory rotary ball mill; FIG. 2 - boot unit (in magnification), in FIG. 3 - end cap.

 The vibratory rotary ball mill is a cylindrical drum 1, rotating with an elastic coupling 2 from the engine 3. The drum itself is mounted in bearing bearings 4 and 5 on a movable vibrating plate 6, which receives by means of springs 7 a vibration force from a plane vibrator 8, which is an engine with two output shaft ends on which unbalanced loads are attached. Drum 1 is divided by vertical perforated partitions 9 into grinding chambers, each of which contains crushed material with grinding media of various sizes to obtain fine powder in the most efficient way. The drum has external hatches (not shown) for loading grinding balls to the optimum degree of filling of the cylinder (in this case, 0.8). The feed is loaded using a loading funnel 10. The feed is above the drum axis by an amount E (see Fig. 2) through the inlet in the end cap 11 (the diameter of the hole must be less than the diameter of the grinding media in the grinding chamber on the loading side), this ensures that the material is loaded to the optimum fill factor - almost the entire working volume of the grinder is used. The drum has a perforated section 12, through which the output of the finished powder.

 The mill operates in the following sequence.

 The source material enters the loading unit (see Fig. 2), which is a loading funnel 10 and an end cap 11, which is pressed by the springs 13 to the end of the drum 1. The springs 13 are fixed in the end cap 11 and the additional rack 14, through which passes loading funnel 10. The end cap 11 is made in the form of a cylinder with a variable cross-section: one end is fixed inside the drum, the guides 15 are made from the other end, rigidly connected with the cover to prevent the latter from rotating.

 As a result of the shock-abrasive effect of grinding media on the material, the latter, being crushed, gradually passes from chamber to chamber through vertical perforated partitions 9 and then leaves the mill through perforated section 12.

Literature
1. Sidenko P. M. Grinding in the chemical industry. M., Chemistry, 1977, ed. 2nd, p. 160.

 2. Kiparisov S.S., Padalko O.V. Equipment for powder metallurgy enterprises. M., Metallurgy, 1988, p. 50.

Claims (1)

 Vibratory rotary ball mill containing a cylindrical drum with grinding media, the housing of which is rigidly connected to springs and an unbalanced vibration exciter located outside the drum, characterized in that the drum is mounted in bearing supports on a movable vibrating plate with the possibility of rotation around its own axis using a separate drive, to implement continuous process of vibration-rotation grinding, the drum is made with an end cap, fixed relative to the drum body, in which above the axis of rotation eniya drum rigidly fixed hopper.

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