无套内谢少妇毛片A片流出白浆,苍井空波多野结衣AA片,欧美又大又色又爽AAAA片,巜电车痴汉玩弄人妻HD,日本精品人妻无码免费大全,日欧一片内射VA在线影院,公交车掀开奶罩边躁狠狠躁漫画,在厨房岳每做爰5,国产精品久久久久久亚洲影视,国產又粗又猛又爽又黄

The effect of lower piston and molybdenum - lipid disulfide

The pile hammer produces a lot of heat when used. To ensure the normal operation of the pile hammer, the upper piston must be lubricated manually by adding molybdenum lithium sulfide to the lower piston every one hour according to the requirements of the product specification, in addition to the forced lubrication of the upper piston by the oil pump.

The functions of adding molybdenum-lithium bisulfide are as follows:

1. Reduce the friction between lower cylinder and upper piston;

2. Improve the sealing performance of piston and cylinder;

3. It can play the role of heat dissipation.

If we stick to the above three points, we can effectively extend the life of pile hammer.