由煤炭科学院抚顺煤炭研究所研究试验、徐州煤矿安全设备制造厂(原徐州矿山设备制造三厂)制造的BF-111型罐笼防坠器已通过部级技术鉴定并投入批量生产。该防坠器通过实验室的试验、煤矿和铁矿的井口脱钩与动负荷试验以及一年多的使用证明,防坠器采用4条拉伸弹簧驱动,滚动摩擦楔 By the Fushun Coal Research Institute Institute of Coal Research test, Xuzhou Coal Mine Safety Equipment Manufacturing Factory (formerly Xuzhou Mining Equipment Manufacturing Factory) to manufacture BF-111-type cage fall arrest device has passed the ministerial-level technical appraisal and put into mass production. The anti-dropping device through laboratory tests, coal mine and iron ore wellhead opening and dynamic load test and more than a year of use proved that anti-dropping device with four tensile spring drive, rolling friction wedge