升降货梯支撑导向环的作用除支承和导向外，还避免了活塞与缸体、活塞与缸盖之间的磨损，保持缸体与活塞、活塞杆与液压缸盖的同轴度。液压缸的支承导向环的材料一般为具有良好自润滑性能及抗磨性能的工程塑料。

1、升降货梯支撑导向环不拉缸，低泄漏。支承环将活塞外表面与缸筒内壁完全隔开，无论“憋劲”现象多么严重，也不发生“拉缸”现象，而且由于摩擦副同轴度较高，径向间隙较均匀，故泄漏少。
Hangzhou freight elevators support guide ring does not pull the cylinder, low leakage. The outer surface of the support ring piston and cylinder inner wall completely separated, no matter how serious, "Bie Jin" phenomenon does not happen "pull-cylinder" phenomenon, but also because of the higher friction concentricity, radial clearance is uniform, so the leak less.

2、升降货梯支撑导向环抛光细化液压缸缸筒内壁，保护密封件。活塞上的支承环相对缸筒内壁面作往复滑动，等于用软的基体对缸壁抛光，因此，表面粗糙度越用越低，越用越好。抛光下来的微小金属粉 末嵌在支承环的软表面内，能保护杭州货梯密封件。
Hangzhou freight elevators support guide ring polished refinement cylinder cylinder wall, to protect seals. Support ring on the piston relative to the cylinder wall for reciprocating sliding, equal to the base with a soft polishing of the cylinder wall, so the more you use, the lower the surface roughness, the more you use, the better. Polishing down the tiny metal powder embedded in the soft surface of the support ring seals to protect Hangzhou freight elevator.

3、升降货梯支撑导向环具有良好的承载能力，更换方便，导向环为开口状浮动式，磨损后更换十分方便。
Hangzhou freight elevators support guide ring has a good carrying capacity, easy to replace, guide ring-shaped floating openings, replace worn very convenient.