Spindle sealing and sand preventing isolation device for mixer of pre-impregnation tower

Abstract

The invention relates to a spindle sealing and sand preventing isolation device for a mixer of a pre-impregnation tower. The spindle sealing and sand preventing isolation device comprises an isolating sand prevention cone (2), a sealing stationary ring (3) and a sealing rotating ring (4), wherein the isolating sand prevention cone (2) is fixed on a bearing chamber (5); the sealing stationary ring (3) is fixed on the isolating sand prevention cone (2); the sealing rotating ring (4) is fixed on a bottom auxiliary mixing blade (6) and rotates along with rotation of the mixing blade; a gap of only 1 mm is formed between the sealing rotating ring and the sealing stationary ring. Under the sealing action of both the stationary ring and the rotating ring, a packing seal (8) of a spindle (7) is isolated from sand, and sand can not enter the sand preventing isolation device, so that damage to sealing, caused by the reason that deposited sand grains enter the packing seal (8), is avoided, and liquid leakage and equipment failures are prevented.

Description

[0001] technical field [0002] The invention relates to a pulping and papermaking prepreg tower, in particular to a main shaft seal and sand prevention isolation device for the agitator of the prepreg tower. Background technique [0003] The prepreg tower is an important cooking equipment in the continuous cooking process in the pulp and paper production line. The wood chips entering the prepreg tower react with the cooking liquid under the action of internal high temperature and high pressure to achieve pre-decomposition. [0004] The prepreg tower includes shell, top screw, top screen basket, bottom scraper and hydraulic drive system. The function of the bottom scraper is to stir and scrape the pre-cooked wood chips and transport them to the next section. In the prior art, the sealing device of the main shaft of the scraper is a packing seal, as attached figure 1 , attached figure 2 shown. [0005] Because the wood chips entering the prepreg tower contain sand and o...

AI Technical Summary

Problems solved by technology

[0005] Because the wood chips entering the prepreg tower contain sand and other impurities, the density of the sand is relatively high and it is easy to deposit at the bottom of the tower, and the height of the discharge port is higher than the sealing device of the main shaft, so there will always be sand deposited at the bottom of the tower around the sealing device and cannot be discharged

With the rotation of the main shaft, sand particles can easily enter the packing sealing device, damage the main shaft and packing seal, and cause leakage

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