Pressure composite sieve for pulping industry

Abstract

The invention relates to a pressure composite sieve for the pulping industry. The pressure composite sieve comprises a housing and a power device. The housing is internally provided with a pulp feeding and crushing zone and a washing and dewatering zone from bottom to top in sequence, wherein the pulp feeding and crushing zone is communicated with the washing and dewatering zone; the pulp feedingand crushing zone is provided with a crushing structure formed by an impeller and a sieve plate; the washing and dewatering area is internally provided with a washing and dewatering structure formed by a rotor and a sieve drum, and the rotor and the impeller are coaxially arranged in a vertical direction; the portion, corresponding to the pulp feeding and crushing zone, of the housing is providedwith a pulp inlet, a first good pulp outlet and a heavy slag outlet; the portion, corresponding to the washing and dewatering zone, of the housing is sequentially provided with a light slag outlet anda second good pulp outlet from top to bottom. The power device is fixed to one side of the top of the housing, an output end of the power device is provided with a first belt pulley, and transmissionthrough a belt and power transmission through a second belt pulley which is arranged on the top of a main shaft are realized; the pulp facing surface of each blade of the impeller is in a circular arc shape, and the length of the upper end surface of the end, away from an impeller core, of each blade is greater than that of the lower end surface of the end, away from the impeller core, of the blade, so that an included angle alpha is formed between the upper end surface and lower end surface of each blade.

Description

technical field [0001] The invention relates to the technical field of papermaking devices, in particular to a pressure composite screen used in the pulping industry. Background technique [0002] The coarse screen is used before the fine screen or front screen system of the pulping and papermaking production line. Its main function is to remove large heavy impurities, light impurities and coarse fibers in mechanical pulp, chemical pulp or waste paper pulp. The conventional pulping production process is to transport the tailings produced by the coarse screen to the slag separator for separation of fibers and impurities. The slag discharge separator only plays the role of separation and has no crushing function. The impurities separated by the slagging separator contain non-fragile pulp, which is re-transported back to the hydropulper for crushing, which makes the pulping process more cumbersome and increases the conveying equipment and pipelines. In order to solve the above...

AI Technical Summary

Problems solved by technology

[0005] For this reason, an object of the present invention is to propose a kind of pressure composite screen for pulp industry, which solves the technical problem of large power consumption of composite screen in the prior art

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