摘要
锚杆预紧力不足是制约煤矿巷道锚杆支护效果和顶板安全的重要问题.基于滚动摩擦原理,提出了一种新的锚杆预紧装置,介绍了其结构和相应的使用方法.建立了锚杆螺母与垫板相互作用的力学模型,得到了锚杆螺母在拧紧过程中的摩擦力矩计算表达式,得到了采用"减摩器"条件下螺母与垫板之间摩擦力矩计算表达式.应用锚杆拧紧扭矩与锚杆预紧力的关系分析了该锚杆预紧装置对提高锚杆预紧力的效果.制作了锚杆预紧装置,并在锚杆实验平台上进行了预紧实验,结果表明该装置可以提高锚杆预紧力,且随着锚杆预紧扭矩的增加预紧力提升幅度相应增加.在现场进行了试用,取得了较好的应用效果.
The insufficiency of bolt pre-tightening force is a striking problem that damages supporting effect and roof safety in coal mine roadway.Based on the principle of rolling friction,a new bolt pre-tightening device was put forward,whose structure and corresponding methods of use were both introduced.The mechanical model was established that of interaction between bolt nut and shim plate,calculation formula of friction torque was govten in the tightening process of bolt nut,and the calculating expression of friction torque between the nut and the pad with the use of‘antifriction device’was figured out.Based on the relation between bolt tightening torque and bolt pre-tightening force,the effect was analyzed related to the improvement of pre-tightening force when utilizing bolt pre-tightening device which hinges on the principle of rolling friction. The whole process demonstrated the feasibility of research and development of this device.The bolt pre-tightening device was made, and the pre-tightening experiment was conducted on the platform for research on a bolt.The result shows that the device improve the bolt pre-tightening force,which increase with the margin of bolt tightening torque.Similarly, it achieves good effects in the field trial.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2014年第3期15-18,共4页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(51374104
51274096)
教育部科学技术研究重点项目(210147)
湖南省教育厅资助科研项目(09B035)
湖南省研究生科研创新项目(CX2012B390)
关键词
锚杆预紧装置
预紧力
减摩器
摩擦力矩
预紧实验
bolt pre-tightening device
pre-tightening force
thrust ball bearing
friction torque
pretightening experiment
