A pressure screen for papermaking

Abstract

The invention relates to the field of papermaking equipment, and discloses a pressure screen for papermaking. The pressure screen comprises a screen drum, a rotating shaft, a screen cylinder, a pressure screen rotor, a slag discharging pipe, a slurry discharging pipe and a slurry feeding pipe, wherein the interior of the pressure screen rotor communicates with the interior of the screen drum, andthe side surface of the pressure screen rotor is provided with a plurality of rotor blocks. In virtue of the design of communication between the screen drum and the pressure screen rotor and the arrangement of flow equalization boards on the top of the screen drum, all the paper pulp entering the pressure screen for papermaking falls into the screen drum and the pressure screen rotor; and when thepressure screen rotor rotates, the rotor blocks on the pressure screen rotor acts on the paper pulp in the screen drum, and paper pulp centrifugally squeezed by the rotation of the pressure screen rotor acts on the paper pulp in the screen drum at the same time, so the pulp, which has flown through a filter screen, in the screen drum is not always in the state of rotational flow of a certain angle, rotational-flow pulp at the filter screen located at the side surface of the screen drum is effectively squeezed, the filter screen is protected from being easily blocked, and the filtration efficiency of subsequent pulp is not affected.

Description

technical field [0001] The invention relates to the field of papermaking equipment, in particular to a pressure screen for papermaking. Background technique [0002] The internal flow pressure screen is a kind of pulp screening equipment, which has the advantages of high screening quality and high capacity. It is suitable as a fine screening equipment for wood pulp, straw pulp and waste paper pulp. Its working principle is as follows (refer to Figure 5 ): Pulp enters through the pulp inlet pipe 9, and at the same time drives the slag guide box 6 through the drive motor to drive the pressure screen rotor 4 inside the screen drum 3 to rotate. coarse impurities. [0003] However, during the use of the existing pressure screen, the pulp is subjected to the rotation of the pressure screen rotor, the pulp forms a vortex state, and relies on the pressure difference to quickly pass through the screen drum, so that the pulp flowing through the filter in the screen drum is always at ...

AI Technical Summary

Problems solved by technology

[0003] However, during the use of the existing pressure screen, the pulp is subjected to the rotation of the pressure screen rotor, the pulp forms a vortex state, and relies on the pressure difference to quickly pass through the screen drum, so that the pulp flowing through the filter in the screen drum is always at an angle In the swirling state, the coarse impurities in the pulp are easy to get stuck on the screen holes of the screen drum, which will cause blockage and reduce the efficiency of subsequent pulp screening

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