demo demo demo demo,demo demo demo demo demo demo demo demo demo demo,3.网部的,demo demo demo demo demo demo demo,demo demo demo demo demo,1)典型网案：无端成型网、胸辊、成形板、沟纹案辊、案辊、脱水板、湿吸箱、真空吸水箱、真空伏辊等脱水元件架托，并由装设在网案下的导,demo demo demo demo demo demo demo demo demo demo demo,2.3结构：管辊，表面度铜或包硬橡胶。两端热装铸铁闷头和钢制轴头，轴上装有滚动,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo,2.1作用：承托成型网；脱水。 2.2要求,demo demo demo demo demo demo demo demo,demo,3.1成形板的作用：1）控制脱水：2）支撑成型网： 3.2成形板的结构： 1）典型结构：为长条形，每块成形板由1-5条组成，根据工,demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,3）安装角度与安装高度：适当前倾，同时与网面留一定间隙，可以控制脱水量，减少磨损。一般前缘留1.5-3mm，后缘留0.75-1,demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,4案辊和挡水板：,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo,1）常用滚动轴承；2）轴承壳应有良好的密封，防止水分浸入；3）要保持良好的润滑，努力减少案辊转动的摩擦力矩,demo demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,4.2沟纹案辊： 4.2.1作用：在车速较高时，靠近胸辊的几根案辊常以沟纹辊代替。这样可使脱水缓和，有利于纸页的均匀成型。沟,demo demo demo demo demo demo demo demo demo demo demo,4.3.2 结构：钢制箱型结构，重量轻、刚度大，上沿与铜网接近的部分，宜用硬橡胶或耐磨塑料板制成，以减,demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,5.案板： 5.1 案板,demo demo demo demo demo demo demo demo demo demo demo,1）叶片：如图4-12，有前角、水平支撑面和后倾角的长条形板，底部做成与连接支架相配合的各种榫口形状。要求摩擦系数小，而且耐磨。常用的材料有高分子聚乙烯、镶陶瓷条、全陶瓷叶,demo demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,5.3 案板设计和使用,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo,脱水量随叶片倾角的增加而增大到某一最大值，继续增大倾角时，案板的脱水量很快下降。一般角在1-5之间。车速高最大倾角选大值（1-5度内变化）；车速低最大倾角选小值（2-3度内变化）。在网部的不同,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,4）案板叶片之间的距离：在网案的湿端，适当增大叶片间的间距，单片脱水量会增加，跳浆现象会减弱。在网案,demo demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo,6.湿吸,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo,1）脱水机理：湿吸箱把压差脱水和刮水两种作用结合起来，使它的脱水能力较案辊和案板大，比普通真空箱小，吸水不吸气，所以称湿吸箱。 2）脱水特性： 脱水稳,demo,demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo demo demo demo demo demo demo demo demo demo,demo demo,1）真空案板： 图4-18 。用案板做湿吸箱的面板条,demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,7.1结构,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo,面板宽一般为250-300毫米。1）面板材料：过去常采用加二硫化钼的硬橡胶或加二硫化钼的MC尼龙6等材料制成，现在多用高分子聚乙烯，使用陶瓷面板的越来越多。2）面板的开孔,demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,7.3真空箱的,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo,1）汽水分离：真空箱内的水和空气，通过气水分离器将水、气分开。分离器上部装有真空调节器，与真空管道相通,demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,3）真空调,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo demo,1)脱水：湿纸页经真空吸水箱脱水后，其干度为12-18，在通过伏辊进一步脱水，可使干度达到18-22，同,demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo,8.3.1 真空伏辊,demo demo demo demo demo demo demo demo demo,一般用锡青铜离心浇铸而成，当使用聚酯网时，为防止腐蚀，采用铜壳包胶或不锈钢辊壳,demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,8.3.2真空伏辊的,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,demo demo demo,从理论上讲，使用包有软橡胶的的上伏辊，可以提高真空度和,demo demo demo,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,8.3.5 真空伏辊,demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo demo,