Attrition mill

Abstract

The invention discloses a pulp refiner, which comprises a grinding disc part, a transmission part and a motor which are connected in sequence, the grinding disc part is installed in a casing, and both the casing and the transmission part are installed on a frame; the grinding disc part includes a rotating grinding disc and a The fixed grinding disc matched with the rotating grinding disc is installed on the main transmission shaft of the transmission part, and the fixed grinding disc is installed on the inner wall of the casing. The transmission part mainly includes the main shaft, bearing seat, driving coupling and driven coupling. The tooth surfaces of the rotating grinding disc and the fixed grinding disc are provided with concentric circular retaining dams. There is a section between every two concentric circular retaining dams. Each grinding disc is provided with 3 or more concentric circular intervals. The tooth depth of the grinding teeth also gradually decreases with the increase of the radius; the working surface of the first circle of grinding gears on the rotating grinding disc near the center of the circle forms an acute inclined angle with the plane of the grinding disc. The invention can overcome the disadvantages of the prior art, and can achieve the effect of high efficiency and low consumption.

Description

technical field [0001] The invention mainly relates to the field of papermaking, in particular to a pulp 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 and low-concentration according to the concentration of the pulp to be ground. It is generally considered that the pulp concentration is below 5% as low-concentration and above 5% 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 slurry, this phenomenon is more serious. In the prior art, in order to solve the problem that the coarser slurry is not easy to enter the tooth gap, a "crushing area" is created at the slurry inlet of the gr...

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 causes many tooth surfaces to fail to be sizing. It can be imagined that the larger the radius of the grinding disc, the greater the phenomenon of no sizing on the tooth surface. Seriously, but in order to improve the beating degree of the slurry, the operator only has to increase the pressure between the two grinding discs, which will easily increase the pressure of the grinding teeth with a small amount of slurry on it, causing the fibers to be cut and a large number of long fibers to become Short fibers reduce the tensile strength of the paper, and due to the uneven slurry coating on the entire disc teeth, there are many tooth surfaces that are not coated with slurry, and these tooth surfaces that are not coated with slurry cause direct friction between the metal surfaces , the noise is deafening, and the slurry temperature at the mill outlet is very high, so a large amount of energy is converted into heat energy and sound energy, resulting in serious power consumption

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