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重型液压机,特别是重型模锻液压机工作条件相当繁重,其上所使用的密封件是由浸渍夹织物制作的 V 形密封件。该类密封件有两种安装形式:一种是整体式,一种是切口式。特别是柱塞结构,应优先采用后一种安装形式。这样可以节省更换密封工作量。带切口的密封件是这样安装的,各个密封圈在圆周方向要有余量,也就是说密封件在装入时周向有所压缩。之所以这样是因为在水的作用下,必须考虑由微小体积膨胀引起的周向轻微收缩。用此方法即可避免由此而造成的困难。密封环经轴向予紧后处于予压状态,
Heavy duty hydraulic presses, especially heavy duty forging hydraulic presses, have heavy working conditions and the seals used on them are V-shaped seals made of impregnated fabric. There are two types of seals of this type of installation: one is monolithic, one is incision. In particular, the plunger structure, the latter should be the preferred form of installation. This will save you the effort of changing the seal. The notched seal is mounted so that each seal has a margin in the circumferential direction, which means that the seal is compressed circumferentially when it is loaded. The reason for this is that, under the action of water, slight shrinkage in the circumferential direction caused by slight volume expansion must be considered. With this method to avoid the resulting difficulties. After the seal ring is prestressed by axial compression,