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Lift manufacturer interprets lift hydraulic cylinder can not drive the load reason升降机厂家解读升降机液压油缸不能驱动负载原因

固定式升降机液压油缸不能驱动负载的原因主要表现为活塞杆停位不准、推力不足、速度下降、工作不稳定等。那么升降机厂家如何解决这些问题呢?液压油经溢流阀旁通回油箱,若溢流阀进入脏物卡住阀芯,使溢流阀常开,液压油会经溢流阀旁通直接流回油箱,导致液压缸没有油进入。若负载过大,溢流阀的调节压力虽已达到最大额定值,但液压缸仍得不到连续动作所需要的推力而不动作。若调节压力较低,则因压力不足达不到重载所需要的推力,表现为推力不够,此时应检查并调整溢流阀。

  液压回路泄露包括阀及液压管路泄露。检修方法是通过操纵换向阀检查并消除液压链接管路的泄露。

  液压缸内部泄露包括液压缸体密封、活塞杆与密封盖密封均磨损过量等引起的泄露。

  活塞杆与密封杆密封泄露的原因是:密封件折皱、挤压、撕裂、磨损、老化、变质、变形等,此时应更换新的密封件。

  活塞密封过量磨损的主要原因是速度控制阀调节不当,造成过高的背压以及密封件安装不当或液压油污染。其次是装配时有异物进入及密封材料质量不好。其后果是动作缓慢、无力,严重时还会造成活塞及缸筒的损坏,出现“拉缸”现象。处理方法是调整速度控制阀,对照安装说明应该做必要的操作和改进清晰过滤器或更换滤芯、液压油。

Fixing is the lift hydraulic cylinder can not drive the load of the main performance of the piston rod stop inaccurate, insufficient thrust, speed decline, unstable work and so on. Then how does the lift manufacturer solve these problems? The hydraulic oil passes through the overflow valve to return to the oil tank. If the overflow valve enters the dirt and gets stuck in the valve core, making the overflow valve open normally, the hydraulic oil will flow directly back to the oil tank through the overflow valve bypass, resulting in no oil entering the hydraulic cylinder. If the load is too large, the overflow valve pressure has reached the maximum rating, but the hydraulic cylinder is still not required for continuous action of the thrust and not action. If the regulating pressure is low, the pressure is insufficient to reach the thrust required by the heavy load, which is shown as insufficient thrust. At this point, the overflow valve should be checked and adjusted.

Leakage of hydraulic circuit includes leakage of valve and hydraulic pipeline. The maintenance method is to control the reversing valve to check and eliminate the leakage of the hydraulic link pipeline.

Internal leakage of hydraulic cylinder includes leakage caused by excessive wear of hydraulic cylinder seal, piston rod and seal cover.

Piston rod and seal rod seal leakage reason is: the seal wrinkle, extrusion, tear, wear, aging, deterioration, deformation, at this time should be replaced with a new seal.

The main cause of excessive wear of piston seal is improper adjustment of speed control valve, resulting in excessive back pressure and improper installation of seals or hydraulic oil pollution. The second is the assembly of foreign body entry and sealing material quality is not good. Its consequence is the action is slow, weak, serious still can cause the damage of piston and cylinder cylinder, appear “pull cylinder” phenomenon. Treatment is to adjust the speed control valve, according to the installation instructions should do the necessary operation and improve the clear filter or replace the filter element, hydraulic oil.



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