SU1342527A1 - Laboratory vibrating mill - Google Patents

Abstract

The invention relates to grinding, grinding solid materials and can be used, for example, in the mining and chemical industries. The purpose of the invention is to improve the quality of the product. The grinding bowl of the vibrating mill is made with a spherical working surface of the bottom, where the grinding iJiap is freely laid, and with continued upwardly growing middle and upper conical surfaces, respectively, of separation and unloading of the product. With the vertical vibrations of the bowl under the ball, the material is crushed, sufficiently small particles climb along the middle steep surface, then vibrate-transfer along the upper flat surface, are dropped through its edge into the collecting cavity under the bowl and are discharged from here. As a result of timely vibroseparation, a minimum of overgrinding and narrow fractionation of the product are achieved. 1.il but

Description

The invention relates to the grinding and grinding of ores, solid materials, namely, vibratory mills, and can be used mainly in laboratory practice in the mining, chemical, food and other industrial sectors.

The purpose of the invention is to improve the quality of the product.

The drawing shows a schematic diagram of the proposed laboratory vibrating mill.

The grinding bowl 1 of the mill is made with a spherical working surface of the bottom and with extended, upwardly moving average 2 and upper 3 conical surfaces intended respectively for the separation and unloading of the product. A grinding ball 4 is laid loosely on the bottom of the bowl. A vibrating table 5, supporting from above, a bowl f and supporting the springs 6, is attached to the vibrating actuator 7, mainly vertical vibrations. The mill is filled with the discharge cavity 8 and equipped with a feed funnel 9. The bottom, spherical, sling and upper conic bows of the bowl smoothly match each other, and it is advisable that the depth of the bottom surface, from the bottom to the first one, is 0, 5 ... 0.7 diameter of the grinding ball 4, and the sphere radius 1.1 ... 1.2 radius ball

In the process of operation of the mill, as a result of vertical oscillations of the bowl. 1 with its collisions with the ball 4 under it, the raw material loaded through the funnel 9 is milled.

The known effect of vibroseparation leads to a rise sufficiently

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Particles on the middle surface 2 (drawing, direction arrows). The particles that have overcome this lift are easily vibro-transported along the upper surface 3 and discharged through its edge into the cavity 8 for unloading.

In the vibrating mill (outer diameter of the bowl at the top 300 mm, ball diameter 50 mm), grinding is carried out at frequencies of 10 ... 400 Hz, amplitude of 1 ... 5 mm with a particle size, samples of copper sandstone about 3 mm and separable grain size 0, -1 mm. The highest efficiency is achieved at a frequency of 30 Hz, an amplitude of 5 mm, and also at 40 Hz and 1 ... 2 mm, overgrinding is an order of magnitude less than in a standard ball mill.

The particle size of the fraction withdrawn can be controlled by deflecting the longitudinal axis of the bowl from the vertical, as well as by changing the vibration parameters. In this connection, adjustable, operatively controlled structures of elastic supports and the vibrating drive are expedient.

The high degree of mono-fractionality of the product provides an increase in the quality of the grinding product.

Claims (1)

Invention Formula Laboratory vibratory mill containing grinding bowl with spherical bottom working surface and free five 0 laid grinding ball, characterized in that, in order to improve the quality of the product, the grinding bowl is made with continuous and upwardly lying middle and upper conical surfaces corresponding to separation and unloading of the product. / 7