SU1209283A1 - Fittings for disk mill - Google Patents

Description

The invention of the oTHociiTCH to the woodworking and pulp and paper industry, namely to the technique of grinding fibrous materials.

The purpose of the invention is to increase the service life of the disc mill headset.

FIG. 1 shows a headset of a disk mill with a central mass drive; a general view of FIG. 2 is a section A-A in FIG. 1, in FIG. 3 - section B - B in FIG. 4 shows an embodiment of a headset, a disk mill with a mass supply from the periphery. General view.

The headset contains a base 1 with grinding knives 2, grooves between them,. Protective knives 4 and grooves 5 between them. The width B of the protective knives 4 is 1.5–5 times the width b of the grinding knives 2, the length L of the protective knives is 1 / 15-1 / 5 of the width 1 of the base 1 of the disc. Eirin.a bj of the grooves 5 between zashr: tny-

mi knives does not exceed the width bd between the grinding knives. The depths on the N grooves 5 are chosen so that their total cross-sectional area is not less than the total cross-sectional area of the grooves 3 between the grinding knives in terms of their internal diameter and is determined by the formula

H g ..illL-,

b f - n,

de N: depth of the grooves between the protective knives, mm, h - depth of the grooves between: waiting for grinding knives, mm, bj width of the grooves between, with protective blades, mm, bg width of the grooves between, grinding with knives, mm, p - number of grooves between

grinding knives, n, the number of grooves between

Protect with knives. The headset works in the following way.

The mass is subjected to grinding, enters the mill, in which two disks are installed with a headset rotating in opposite directions, or one disk is rotating, the other is non-moving. When the mass flow from the center to the periphery, the mass passes through the grooves 5 between the protective knives 4 and falls on the grinding knives, where

milled. If the foreign inclusions are larger than the width of the grooves between the protective knives, they are retained by the protective knives and do not fall into the knife space of the knives. When the mass flow from the periphery to the center (for example, with the serial connection of a double mill), the protective knives on the headset should be positioned along

5 to the outer base of the disk (figure 4).

If the width of the protective knives is less than 1.5 times the width of the grinding knives, if foreign inclusions hit, the safety knives break down and they do not fulfill their function. With respect to FJH-: dzina: protective knives to the width of grinding more than 5, the productivity of the mill decreases, as the number of grooves for the passage of mass decreases, and their depth is limited by the size of the headset.

When the safety barrier is less than 1/15 ESP of the base of the disk, damage to the knives is observed as well, i.e. they do not fulfill their function. It is economically unprofitable to use protective knives more than 1/5 the width of the disk base, since the location of the zasd-1t knives on the working surface of the headset reduces the length of the grinding knives, which in turn reduces the productivity and quality of grinding.

The presence of durable protective knives made of a material with high toughness will prevent an emergency exit from the grinding headset with knives made of diamond-containing material and work out the entire life of such a headset that has increased wear resistance to abrasion but does not have sufficient toughness. Since the proposed solution does not significantly increase the cost of the headset design, the economic effect will be gained from using such a headset under the condition that no wear.

five

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1

Phil. 2

Phage.3

Editor H, dumb

Compiled by L. Chubukova

Tehred A.Ach Corrector V.Sinitska

Order 347/12

Circulation 583 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-355, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Claims (1)

DISC MILL HEADSET, containing a base with annular entry and grinding zones having knives and grooves of different widths mea ^ in them, characterized in that, in order to increase the service life, the entry zone knives are 1.5-5 times wider the width of the knives of the grinding zone, and a length equal to 1 / 15-1 / 5 of the width of the base, and the width of the grooves between the knives of the entry zone does not exceed the width of the grooves between the knives of the grinding zone, and the depth of the grooves is determined by the total area of their section, which is not less than the total area section the grooves between the knives are grinded. zone in its inner diameter.