概述

升流压力筛是我厂消化吸收进口样机技术研制开发的一种新型再生纸浆料筛选设备。该设备针对再生纸浆中杂质的特性设计为升流结构。可广泛应于各种废纸浆的粗筛选及纸机

前浆料的筛选，具有无可比拟的良好工作性能和可靠性，是各种国产压力筛用于再生浆处理的更新换代产品.

Upflow pressure screen is a new type of screening equipment for recycled pulp developed by our factory by absorbing imported prototype technology. The equipment is designed for upflow structure according to the characteristics of impurities in recycled pulp. It can be widely used in the rough screening of various waste pulps and the screening of pulps before paper machines. It has incomparable good performance and reliability. It is a renewal product of various domestic pressure sieves for the treatment of regenerated pulp.

 工作原理

众所周知，再生纸浆中的杂质分轻杂质和重杂质两部分。传统型压力筛由上部进料。低部排渣，轻杂质都通过整个筛浆区。当处理化学浆时，因浆中杂质的比重和质量一般都大于单根纤维。这种结构有利于减少杂质在设备内的停留时间，但当处理再生纸浆这种含有大量比重较小的的轻杂质时，就会大大延长轻杂质在设备内的停留时间，而造成筛选效率的下降和加大转子同筛鼓的磨损甚至损坏。

压力筛采取底部进浆，底部排重渣、顶部排轻渣的升流式结构设计，可有效地解决上述问题。轻杂质与浆料中的空气自然上升到顶部排口排出，重杂质一进入机体即可沉降到底

部排出。这样一方面有效地缩短了杂质在筛区内的停留时间，降低杂质循环的可能性，提高了筛选效率。另一方面防止重杂质对转子和筛鼓造成的损坏，延长设备的使用寿命。

Working principle

As we all know, impurities in recycled pulp are divided into two parts: light impurities and heavy impurities. The traditional pressure screen consists of upper feed and low slag discharge. Light impurities pass through the entire sieve zone. When chemical pulp is treated, the specific gravity and mass of impurities in pulp are generally larger than that of single fiber. This structure helps to reduce the residence time of impurities in the equipment, but when the recycled pulp contains a large number of light impurities with a small proportion, it will greatly prolong the residence time of light impurities in the equipment, resulting in the decrease of screening efficiency and increase the wear and even damage of the sieve drum and the rotor.

This problem can be effectively solved by adopting the upflow structure design of bottom pulp feeding, bottom weight slag discharging and top light slag discharging. Light impurities and air in the pulp rise naturally to the top outlet and discharge, heavy impurities can settle to the bottom of the body and discharge as soon as they enter. On the one hand, it effectively shortens the residence time of impurities in the screen area, reduces the possibility of impurity circulation, and improves the screening efficiency. On the other hand, it prevents the damage caused by heavy impurities to the rotor and sieve drum, and prolongs the service life of the equipment.

结构性能

1. 筛鼓：精筛筛鼓筛缝宽度0.12mm，使用波纹棒条筛鼓，形成无毛刺槽口，不会像机械洗磨槽口产生毛刺及槽端裂缝。并可提供硬质镀铬工艺以提高抗磨损性能。

2. 旋翼转子：转子采用鼓式外装弧形片结构，并校正动平衡。通过水力脉冲对筛鼓进行清洗。这种结构可防止杂质缠饶转子，影响设备正常运转。

3.外壳；由上盖和筒体组成，筒体下部设有切向进浆管，筒体中上部设有出浆管，上盖有排渣口及冲洗水口。

4. 传动装置；包括电机，皮带轮，V型带。皮带张紧装置，主轴及轴承。

Structure performance

1. Screen drum: The width of screen slot of fine screen drum is 0.12mm. Using corrugated bar screen drum, no burr groove is formed. It will not produce burr and crack at groove end like mechanical washing and grinding groove. The hard chromium plating process can be provided to improve wear resistance.

2. Rotary-wing rotor: the rotor adopts drum type external arc piece structure, and the dynamic balance is corrected. The sieve drum is cleaned by hydraulic pulse. This structure can prevent impurities from winding up the rotor, affecting the normal operation of the equipment.

3. Shell: It is composed of an upper cover and a cylinder body. The lower part of the cylinder body is provided with a tangential pulp feeding pipe, the upper part of the cylinder body is provided with a pulp outlet, and the upper cover is provided with a slag discharge port and a flushing water outlet.

4. Transmission device: including motor, belt pulley, V belt, belt tension device, spindle and bearing.