液压升降机现在普遍用于各行各业，属于一种非常常见而且方便的机械设备。
Hydraulic lift is now widely used in various industries, is a very common and convenient machinery and equipment.
 
升降机主要特点是承重量大，弥补了一般电梯的缺点，受到了广大用户的青睐。而密封件又是液压升降机中很重要的一个零件。密封件是防止流体或固体微粒从相邻结合面间泄漏以及防止外界杂质如灰尘与水分等侵入机器设备内部的零部件的材料或零件。
Hangzhou lift the main characteristics of the load-bearing capacity, to make up for the shortcomings of the general elevator, the majority of users of all ages. The seal is a hydraulic lift in a very important part. Seal to prevent fluid or solid particles between the surface and to prevent leakage from the adjacent combined external impurities such as materials or parts, such as dust and water intrusion inside the machine equipment parts.
 
各种密封件其性能影响因素是不同的，如机械密封（填料密封等）影响因素有温度、介质、磨损、所承受压力等。
Factors which influence the performance of various sealing members are different, such as mechanical seals (packing etc.) factors are temperature, medium, wear, the pressures and the like.
 
按不同的用途，密封件大致是按下列的分类：
According to different uses, the sealing member substantially according to the following classification:
 
1.按作用分类：分为轴用密封、升降机孔用密封、防尘密封、导向环、固定密封、回转密封；
1. role Category: divided shaft seal, lift hole sealed, dust-proof seals, guide rings, fixed seals, rotary seals;
 
2.按材料分类：分为橡胶、聚氨酯、工程塑料等。
2 By Material: into rubber, polyurethane, plastic and so on.
 
密封件虽小，但是它在液压升降机中的起的最用很大。
Seals are small, but it plays in the hydraulic lift of the most used widely.