SU1212569A1 - Mill - Google Patents

Description

2. The mill according to claim 1, of which is provided with a retaining flap attached to the vertical wall of the diffuser on the peripheral side of the table, covering the outer edge of the table

The invention relates to devices for grinding materials, namely, roller mills with a flat table, and can be used for the preparation of powders in the building materials industry, mining, in metallurgy, chemical technology, thermal power engineering and other branches of the national economy.

The purpose of the invention is to increase the productivity and efficiency of the grinding process and reduce energy consumption.

FIG. 1 schematically shows a mill, a general view; in fig. 2 shows section A-A in FIG. 1 when removing the mill housing.

The mill includes a housing 1, to which an annular duct 2 is adjacent to the bottom with a nozzle 3 for supplying a drying ventilating agent. In the housing 1 a flat table 4 rotates with a grinding track 5, along which rolls 6 are connected, connected to

the pressure device 7. The mill may have one or more cylindrical leaks 8 supplying the source material, installed vertically and terminating with nozzles 9 supplying the starting material to each roll 6. The output section of each nozzle 9 is made in the form of a rectangular diffuser 10, the lower edge of which is located with a gap 3-15 mm above the grinding track 5 before the incident roll 6.

The width of the output section of the rectangular diffuser 10 is made equal to the width of the grinding track 5. To the vertical wall of the rectangular diffuser 10 facing the mill housing 1, a retaining plate 11 is connected, which covers the outer edge of the table 4 to the place where the roll 6 touches the grinding track 5 The height hj of the retaining flap 11 is 1.8-2.0 times the height of the layer of fuel h, -. Thus, ts, - (1,8-2,0) t, and

to the place where the roll and the grinding track touch, the shield height is 1.8-2.0 times the height of the layer of the material to be ground, and the diffuser output section width is equal to the width of the grinding track.

L, D in,, where E, is the proportionality coefficient depending on the design of the mill and the quality of the fuel; in - the diameter of the roll.

The mill works as follows. The starting material is fed through cylindrical chutes 8, nozzles 9, through the exit sections made in the form of rectangular diffusers 10, fed to the grinding track 5 before each rolling roller 6. The starting material, falling onto the rotating table 4, is pulled under the rolls 6 and under by their force of gravity, as well as by the force of the pressure device 7, is crushed and discharged into the annular gap between the table 4 and the housing 1, through which the drying and ventilating agent is blown out of the duct 2 with the nozzle 3 and transported the crushed material from the mill to them. Retaining plates 11 prevent the source material from being dropped from the table 4

The effectiveness of the proposed mill is determined by a significant increase in productivity and a reduction in energy consumption for grinding.

An individual supply of the source material to the grinding track in front of each roll through the chute and the nozzle with a diffuser doubles the angular velocity of the table without fear of dropping the source material from it, which additionally guarantees a retaining flap. This, in turn, makes it possible to double the mill productivity. Twice the increased angular velocity of rotation of the table ensures timely dropping of the ground material from the table, immediately after each roll, which significantly reduces the overgrinding of the material.

Reducing overgrinding of the material reduces the specific energy consumption for grinding.

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Editor S. Patrushev

Compiled by V. Revva Tehred 3. Pa LI

673/12

Circulation 583 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35. Raushsk nab. 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

FIG. 2

Proof-reader I. Erdeyi

Claims (2)

1. MILL, containing a flat table rotating around a vertical axis with a grinding track, rolls with a pressing system located on it and a cylindrical heat supply of the feed material, characterized in that, in order to increase the productivity and efficiency of the grinding process and reduce its energy intensity, the mill is equipped with connected with a cylindrical estrus, nozzles for supplying raw material to each roll, and the outlet section of each nozzle is made in the form of a rectangular diffuser, the lower edge of which is positioned with a clearance above the grinding track in front of the roll. SU .... 1212569> 2. Mill according to π. 1, characterized in that it is equipped with a retaining flap attached to the vertical wall of the diffuser from the peripheral side of the table, covering the outer edge of the table to the point where the roll and grinding path touch, and the height of the flap is 1.8-2.0 times greater than the height of the crushed layer material, and the width of the outlet cross section of the diffuser is equal to the width of the grinding track. ¹