目前,我国运用的30000辆罐车,由于人孔盖垫结构不合理,导致罐盖关闭不严,油品外溢、失窃损失及危及行车安全。铁科院机辆所,经3年的调查、研究设计、试验改进,提供了新型一体式浸螺栓,胶垫固定措施、罐盖折页锁焊固措施及边缘防油溢档圈等,解决了长期存在的因罐盖螺栓损坏、锈蚀、丢失问题,而造成的 At present, due to the unreasonable structure of manhole cover pad, the 30,000 tanker trucks used in our country have caused the problems such as the closed canister lid, oil spills, theft loss and endangering traffic safety. After three years’ investigation, research, design and test improvement, the institute has provided a new type of integrated immersion bolts, rubber pad fixing measures, lid cover hinge lock welding measures, and edge oil spill restraint ring to solve the problem. The long-term because of the can cover bolt damage, corrosion, loss problems caused