An automatic removal device and method for preventing iron impurities from entering a refiner

Abstract

The invention discloses an automatic clearing device and method for preventing iron sundries from entering a pulping machine. The device comprises a valve body, a core plate sliding in the valve body and an electric push rod for pushing the core plate to slide in the valve body; the core plate comprises a core plate body, a sealing gasket and a magnet yoke; the core plate body is arranged in a box body manner with an opening in the surface, and the magnet yoke is arranged on the opening of the core plate body in a sealed manner through the sealing gasket; a fixed magnetic system and a moving magnetic system are arranged in the core plate body; the fixed magnetic system fixed to one end of the core plate body is composed of a plurality of parallel magnetic sets arranged at intervals, and each magnetic set internally comprises a plurality of permanent magnetic blocks sequentially arranged in the magnetic pole direction, and the magnetic poles of the adjacent permanent magnetic blocks are opposite; the moving magnetic system is arranged at the other end of the core plate body in a sliding manner, and the magnetic set structure of the moving magnetic system and the magnetic set structure of the fixed magnetic system are the same; magnetic sets of the moving magnetic system are embedded in the position between the magnetic sets of the fixed magnetic system; and a spring is arranged between the moving magnetic system and the fixed magnetic system. Grinding disc grinding teeth can be effectively protected.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to an automatic removal device and method for preventing iron impurities from entering a refiner. Background technique [0002] In the pulp and paper industry, the refiner is a very important pulping equipment. The pulp enters the refiner from the inlet of the refiner, and is transported to the space between the fixed plate and the moving plate through a screw device. There are grooved grinding teeth, and the slurry is broken into fibers or fiber bundles under the action of shearing and extrusion of the grinding teeth of the grinding disc. This process is accompanied by high temperature and high pressure conditions. Once the raw material is mixed with iron wire, Hard iron objects such as iron nails, these iron impurities will instantly block the groove of the grinding teeth, and in severe cases, the grinding teeth will be broken into pits, causing great harm to the e...

AI Technical Summary

Problems solved by technology

[0002] In the pulp and paper industry, the refiner is a very important pulping equipment. The pulp enters the refiner from the inlet of the refiner, and is transported to the space between the fixed plate and the moving plate through a screw device. There are grooved grinding teeth, and the slurry is broken into fibers or fiber bundles under the action of shearing and extrusion of the grinding teeth of the grinding disc. This process is accompanied by high temperature and high pressure conditions. Once the raw material is mixed with iron wire, Iron nails and other hard iron objects, these iron impurities will instantly block the groove of the grinding teeth, and in severe cases, the grinding teeth will be broken into pits, causing great harm to the equipment

[0003] The difficulty in filtering out iron impurities such as iron nails and iron wires mixed in the slurry is that the slurry is in a state of high-speed flow. Using ordinary filter screens to filter out part of the slurry will cause part of the slurry to be filtered out, thereby blocking the filter screen and affecting The normal flow of slurry cannot solve the problem of filtering iron hard impurities in the existing refiner slurry

Images