升降货梯支杆带载不能提升的原因

1、升降货梯http://www.jntr168.com/液压泵站严重损坏。在低速运转时泵站泄漏严重，高速运转时，泵内压力稍有提高，但由于泵的磨损及内泄，容积效率显著下降，很难达到额定压力。液压泵长时间 工作又加剧了磨损，油温升高，由此造成升降台液压元件磨损及密封件的老化、损坏，丧失密封作用，液压油变质，最后导致故障发生。
Cargo lift pump stations severely damaged. At low speed pumping serious leakage, high-speed operation, the pump pressure is slightly increased, but due to wear and internal leakage of the pump, volumetric efficiency significantly decreased, it is difficult to reach the rated pressure. Pump wear and tear aggravated by long working hours,temperature rise, the resulting wear lifts hydraulic components and seals of aging, damage, loss of seal, hydraulic oil deterioration, leading to failure.

2、升降货梯液压元件选型不合理，动臂油缸规格为70/40非标准系列，密封件亦为非标准件，制造成本高且密封件更换不便，动臂油缸缸径小，势必导致系统调定压力过高。
Cargo lifter unreasonable selection of hydraulic components, the boom cylinder non-standard specifications for the 70/40 series, the seal is also a non-standard parts, high manufacturing cost and inconvenience of replacing the seal boom cylinder bore small, will inevitably lead to the system set pressure too.

3、升降货梯http://www.jntr168.com/液压系统设计不合理，升降货梯操纵阀与全液压转向器为单泵串联，安全阀调定压力分16MPa，而液压泵的额定工作压力也为16MPa。液压泵经常在满负载或长时间超负荷(高压)情况下工作，并且系统有液力冲击，升降货梯液压油长期不换，液压油受污染，加剧液压泵磨损，以致液压泵泵壳损毁。
Cargo lifter hydraulic system design is unreasonable, cargo lift control valve and hydraulic steering gear as a single pump series, the safety valve set pressure points 16MPa, while the rated working pressure of the hydraulic pump is 16MPa. Pumps often work at full load or prolonged overload (high pressure) situation, and the system has hydraulic shock cargo lifter does not change the long-term hydraulic oil, hydraulic oil contamination, increased pump wear and tear, so that the pump casing damage.