Top unloader of pressure type upwash bleaching tower

Abstract

The invention discloses a top unloader of a pressure type upwash tower, comprising a rotary pulp discharging barrel, a pulp scraping plate, a pulp storage box, Morse's taper connection, a helical band, a bracket, a rotating shaft, a shaft joint and a variable-frequency motor, wherein the variable-frequency motor is connected with the rotating shaft through the shaft joint, and the rotating shaft is in Morse's taper connection with the rotary pulp discharging barrel; the upper end and the lower end of the rotary pulp discharging barrel are both sealed, the helical band is arranged inside the rotary pulp discharging barrel, pulp inlets are arranged at the left side and the right side of the rotary pulp discharging barrel, a rectangular pulp outlet is arranged in the tangential direction of the helical band and communicated with the pulp storage box; and the lower end of the rotary pulp discharging barrel is connected with the pulp scraping plate. The variable-frequency motor controls the rotating shaft and the rotary pulp discharging barrel internally provided with the helical band to rotate together, and the pulp scraping plate also rotates along with the rotating shaft and the rotary pulp discharging barrel; in addition, paper pulp enters from the two pulp inlets at the sides of the rotary pulp discharging barrel and helically raises in the rotary pulp discharging barrel to form powerful overfall, thereby better dispersing the paper pulp and reducing the flow resistance.

Description

technical field [0001] The invention relates to a pulp unloader in pulping and papermaking, in particular to a pressure type tower top unloader of an upflow bleaching tower. Background technique [0002] At present, my country's pressure-type up-flow bleaching tower top unloader is mainly divided into two types: one is the mechanical scraper type, which uses the rotation of two symmetrical rake arms, and the scraper on the rake arm keeps the tower The stagnant pulp is scraped towards the outlet. This kind of unloader requires a high strength rake arm. Due to the high flow resistance of medium consistency pulp, this kind of unloader requires high energy consumption. Moreover, once this kind of unloader encounters unexpected situations, such as occasional short-term shutdown or long production time, the slurry accumulation will be serious in some places, and the gap between the scraper and the tower wall will become smaller and smaller. The gap of the machine may be completely...

AI Technical Summary

Problems solved by technology

This kind of unloader is usually equipped with a pulp outlet pipe on the upper head of the bleaching tower. There is a rotor rotating at high speed in the pulp outlet pipe, and then the pulp is discharged from the side. This method is easier to discharge the pulp, but the design of the rotor The requirements are relatively high, the shape of the rotor is not well designed, and it is easy to hang the pulp. Moreover, for the viscoelastic body of medium-high consistency pulp, a special rotor is required. Due to the relatively large pressure difference inside and outside the tower, the route is relatively short, and the flow resistance is relatively small. If there is a short circuit, the most important thing is that the top head of the upflow bleaching tower, except for the place where the pulp outlet is, will accumulate pulp after a long time because there is no scraper and no outlet, which will affect the discharge of pulp, and it also requires manual labor. Clean up the sludge

Therefore, domestic up-flow bleaching tower top unloaders generally have the following disadvantages: (1) It is relatively easy to accumulate pulp and needs to be manually cleaned regularly; some need to be cleaned more often; this is a troublesome problem

(2) The pulp fluid is prone to short circuit or open circuit. The open circuit will cause the pulp to be unable to be transported out, and the short circuit will cause the pressure of the pulp to be ejected, which is not conducive to industrial production. Potential to cause problems with the transmission system

However, since the unloader has only one pulp outlet, the pulp discharge is uneven; moreover, the umbrella-shaped squeegee will be powerless against the long-term pulp accumulation

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