SU1406273A1 - Segmented abrasion disk of machine for fibrous mass - Google Patents

Description

(21) 4162907 / 29-12

(22) 12/15/86

(46) 06.30.88. Bul No. 24

(71) Central Paper Research Institute and Production Association Sverdlovsk Experimental Plant for Technological Products

(72) A.A. Zuykov, S.M., Vladimirov, E.N. Osminin, GD Parshikov, N.A. Dykov, A.S. Solov'ev, V, V, Goroshnikov, D.P. Ermilova and R.Kh. Zaripov

(53) 676.1.053.33 (088.8)

(56) USSR author's certificate

No. 746006, cl. D 21 D 1/30, 1976.

USSR Author's Certificate No. 896126, cl. D 21 D 1/30, 1982.

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(54) SEGMENT ABRASIVE MASTERS FOR PREPARING FIBER MASS

(57) The invention relates to the pulp and paper industry and can be used for the preparation of pulp in the production of paper and cardboard. The purpose of the invention is to improve the performance properties of the abrasive disk and ensure the stability of the grinding mode. The segmented abrasive disk contains a base 1 with ceramic segments 2 fixed to it, having a lead-in knife zone 3 and a flat grinding surface 4. On the inner surface of each segment.

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the facing 1 of the base 1, are connected interconnected recesses 5. For the supply of water and steam from the side of the base 1 in it you have | Full holes 6. The surface of each segment is limited by peripheral closed protrusion 7.

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The invention relates to grinding discs of machines and can be used in the pulp and paper industry, in particular in the production of pulp from chips.

The purpose of the invention is to improve the performance properties of the abrasive disc and ensure the stability of the grinding mode,

FIG. 1 shows a machine disk, cross sectional view in FIG. 2 - disk, view from the base,

The disk of the pulp making machine consists of a base 1 with ceramic segments 2 fixed to it, which have a lead-in knife zone 3 and a flat surface 4. The surface of each segment facing the base 1 is made with interconnecting recesses 5 which serve to distribute steam and water supplied to them from the base 1 of the disc through holes 6 made therein, water or steam supply elements (not shown), the surface of each segment 2 on which is located The holes 5 are bounded by a peripheral closed lip 7.

The disc works as follows.

The milled material together with a part of the transporting stream of liquid or steam enters the center of the disk 1. Under the action of the rotating blades of the rotor disk (the main disk is not specified) the material is sent to the knife entry zone 3 of the segments 2, where the preliminary grinding of the material takes place under the influence of friction forces and partial additional formation of steam, the amount of which depends on the grinding conditions.

The disk supplying water or steam to the grinding zone on the side of the inner surface provides the effect of water (steam) on the temperature and pressure in the zone, which increases the quality of the resulting pulp and durability of the abrasive disk, 2 Il.

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Moving from the central zone of the disk to the peripheral zone, the fiber enters the flat grinding zone, where the fibrillation of the fibers occurs under the action of the abrasive surface of 4 ceramic segments.

Dp decreasing the temperature in the fibrillation zone of the fibers through the holes 6 in the base 1 of the disk and the recess 5 into the grinding zone, thanks to the porous structure of the ceramic segments, water or steam is supplied with a temperature that causes condensation of steam or a decrease in its temperature.

When this occurs, the pressure in the grinding zone decreases, and the surface of the ceramic segments and the material being processed are prevented from overheating. In addition, liquid or steam flowing through the porous structure of the segment washes away the fibers from the recesses between the abrasive grains and cleans the surface of the grinding disk. The ground fibers together with water under the action of centrifugal forces caused by the rotation of the rotor, came out of the grinding zone.

The peripheral closed lip prevents liquid from entering from the recess area in a direction parallel to the disk surface. In addition, during the grinding process, the mass tightly clogs the available distance between the segments and the peripheral protrusion of the segment and the bounding shoulder of the base 1, forming a natural waterproof gasket.

The use of such grinding discs, due to the possibility of supplying water or steam to the temperature conditions of grinding and reducing the resulting pressure peaks in the grinding zone, provides for an increase in the quality and stability of the material to be ground, especially in terms of co-storage of the original whiteness.

On the surface of the grinding ceramic segments facing the - grinding zone, there are no holes and recesses, which are the main cause of the destruction of the ceramic segments, and therefore the service life of the latter significantly increases.

The increase in the useful area of the abrasive surface leads to an increase in the specific power of the grinding surface and, as a result, to a decrease in the specific energy consumption per unit of production.

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Claims (1)

Invention Formula Segment Abrasive Machine for making pulp containing a base and fixed on it ceramic segments with a grinding surface, characterized in that, in order to improve the performance properties abrasive disk and ensuring the stability of the grinding mode. It has located on the surface of each of the segments facing the base and bounded by a peripheral curved protrusion, communicating with each other recesses for connection with the water supply system or Lara.