针对现有磁流变液不适用于曳引电梯磁流变制动技术的问题,研究磁流变液的摩擦学性能非常关键,影响着电梯制动器的制动效果。通过以石墨、油脂作为添加剂,制备4种硅油基磁流变液,并利用四球摩擦试验机模拟磁流变液在电梯传动装置中的运行工况,记录摩擦系数的变化,用影像显微镜观察和测量磨斑大小。通过流变仪测量磁流变液在摩擦实验前后流变性能的变化,分析磁流变液在装置中的摩擦磨损对其性能的影响。结果表明添加剂在一定程度上能对磁流变液具有减摩作用,摩擦后的流变性能均有所增大,并发现添加0.5%石墨的磁流变液具有低零场粘度、高磁致剪切应力,具有较好的稳定性,是适用于曳引电梯磁流变制动器中的磁流变液。

For the existing magnetorheological fluid(MRF) does not apply in tractive elevator magnetorheological brake, studying the tribological performance of MR fluid is critical, related to the brake effectiveness. Four kinds of MRF was prepared with graphite, grease of silicone fluid for extra additives. Simulation of MRF in elevator transmission device by four-ball test machine, recording the friction coefficient changing of MRF, the size of wear scar was observed and measured by image microscope. The rheological properties of MRF before and after friction experiment were measured by rheometer, and the influence of friction and wear on performance of the MRF in the device was analyzed. Test and analysis results shows that the additive can reduce the friction of MRF to a certain extent, the rheological properties are increased after friction, the MRF with 0.5% graphite has low zero-field viscosity, high yield shear stress, and good stability, which is suitable for the MRF of traction elevator brake.

TH

福建省自然科学基金面上项目(2020J01452)；