Sealing device for spindle of disc mill used as density fiberboard production equipment

Abstract

The invention discloses a sealing device for a spindle of a disc mill used as density fiberboard production equipment. According to the invention, an oil seal chamber, a flushing ring, an embedded part and a sealing ring are simultaneously mounted outside a shaft sleeve on the driving spindle in a matched manner through a sealing seat; a packing is arranged in the oil seal chamber; the flushing ring is connected with a compressed air source through an air inlet; and the front end of the sealing ring is inserted into a limiting groove in the back of a movable millstone. Slurry and steam in a pulping area of the disc mill are sealed through a plurality of groups of seal loops so as to prevent a sealing medium from leakage; compressed air is introduced through the air inlet in the system operation process; so leakage of the sealing medium in the operation process and damage of pulp to the shaft sleeve and the seal loop group in the oil seal chamber in the pulp grinding process are reduced, the leakage of the sealing medium can be prevented, and abrasion to a sealing assembly and the spindle is reduced. The sealing device has the advantages of good sealing effect, reliable performance,simple structure, convenient operation, small maintenance workload, and low cost.

Description

technical field [0001] The invention relates to a sealing device for the main shaft of a disc refiner for fiber preparation on a papermaking or medium (high) density fiberboard production line. Background technique [0002] The core equipment of the papermaking or medium-high-density fiberboard pulping production line is the disc refiner. The raw materials are decomposed into qualified fibers in the high-speed rotating disc refiner. The continuity and stability of the disc refiner during operation are important factors affecting the fiber quality. Factors; during the operation of the disc refiner, it is necessary to seal and block the steam and slurry in the refining area of ​​the main disc refiner. In the prior art, two types of sealing are generally used to seal and block: one is the packing seal, and the packing is formed by the compression ring. It is tightly contacted with the shaft by limit compression with the retaining ring, and the packing expands under the action o...

AI Technical Summary

Problems solved by technology

[0002] The core equipment of the papermaking or medium-high-density fiberboard pulping production line is the disc refiner. The raw materials are decomposed into qualified fibers in the high-speed rotating disc refiner. The continuity and stability of the disc refiner during operation are important factors affecting the fiber quality. Factors; during the operation of the disc refiner, it is necessary to seal and block the steam and slurry in the refining area of ​​the main disc refiner. In the prior art, two types of sealing are generally used to seal and block: one is the packing seal, and the packing is formed by the compression ring. It is tightly contacted with the shaft by limit compression with the retaining ring, and the packing expands under the action of the tightening screw, which belongs to the auxiliary sealing method. Usually, it is necessary to add a sealing medium to exert the sealing effect. After working for a period of time, the packing will wear the shaft Larger, easy to cause leakage of sealing medium, short service life of sealing parts, low equipment efficiency, long maintenance time, high cooling water consumption, and high power consumption in the subsequent drying section; The machining accuracy of the components at the installation site is high, and a corresponding sealed cooling system is required, and the water quality required by the sealed cooling system is high, and the initial investment cost and follow-up maintenance cost are high.

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