Millstone for refiner

Abstract

The invention discloses paste mill millstone. It includes rolling millstone set on paste mill main shaft and fixed millstone set in shell body and cooperated with the rolling millstone. The rolling and fixed millstone are set concentric circle shield dam. One there and back shear zone is set between each two of the concentric circle shield dams. Each of the millstones is set more than four concentric circles there and back shear zones. The concentric circle there and back shear zone of the rolling and fixed millstone are alternated. Single shear zone is set between the neighbor concentric circle shield dams. Tooth space depth and single shear zone are both gradually diminished with the semi-diameter increasing. The bottom of tooth space of the first grinding teeth closed to circle center on rolling millstone is steep incline. Tooth shape is commutating tooth. The invention is used in paste mill millstone which can reduce energy consumption, and increase grinding pulp quality and yield but with simple structure.

Description

technical field [0001] The invention mainly relates to the field of refiners used in the papermaking industry, in particular to a grinding disc for the refiner. Background technique [0002] In the prior art, the refining equipment is mainly a refiner (including cylindrical and conical) and a disc refiner (double disc and single disc), and the latter is more widely used. Disc refiners are divided into high-concentration, medium-concentration and low-concentration according to the concentration of the pulp to be ground. It is generally considered that the pulp concentration is less than 5% as low-concentration, 5-12% as medium-concentration, and more than 12% as high-concentration. When the concentration is high, it is difficult for the slurry to enter the narrow gap between the teeth of the grinding disc, forming the so-called "bridging" phenomenon, especially for those thicker slurries, this phenomenon is more serious. In the prior art, in order to solve the problem that t...

AI Technical Summary

Problems solved by technology

In addition, most of the pulp that has not been completely ground is pulp lumps and pulp lumps, which has caused many tooth surfaces to fail to be sized

From this, it can be imagined that the larger the radius of the grinding disc, the more serious the phenomenon of no slurry on the tooth surface, but in order to improve the beating degree of the slurry, the operator only needs to increase the pressure between the two grinding discs, so that it is easy to make a small amount of slurry hang The pressure of the grinding teeth increases, causing the fibers to be cut off, and a large number of long fibers become short fibers, which reduces the tensile strength of the paper, and due to the uneven slurry coating on the entire tooth surface, many tooth surfaces are not coated with slurry , These tooth surfaces without slurry cause direct friction between the metal surfaces, the noise is deafening, and the temperature of the slurry at the mill outlet rises, so a large amount of energy is converted into heat energy and sound energy, resulting in serious power consumption

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