Safety Analysis And Research On Over-coiling Protection During Friction Lifting

Coal is in the dominant position in the energy structure of our country,and the development of our economy depends on coal resources very much.Therefore,the safe mining of coal is the subject of our long-term research.At present,the rapid development of science and technology greatly reduces the occurrence of over-coiling accidents in lifting systems,but there are still over-coiling accidents in shaft friction lifting systems.Taking multi-rope friction lifting system as an example,this paper analyzes the safety of lifting system in the process of over-coiling protection from the point of view of kinematics and dynamics,analyzes and studies the special situation of loose rope and sliding rope in the process of over-coiling protection,and analyzes and studies the steel strip over-coiling protection device steel strip for design.The main research contents are as follows:(1)The paper reviewed the relevant data and literature,expounded the importance of shaft friction lifting system,summarized the causes of over-roll accident,and summarized the research progress on over-roll protection at home and abroad.(2)This article analyzes and studies the protection process of vertical shaft friction hoisting over-coiling,and analyzes in detail the braking situation of hoisting system,buffer device and anti-collision beam when hoisting container is over-coiling.The tail rope is ignored or assumed to be a constant.In this paper,the length of the tail rope on both sides is considered as a variable in the actual process,and the speed and acceleration of the lifting container at different positions on the lifting side and the lowering side of the friction lifting system are obtained respectively.The calculation method of displacement and the calculation formula of the tension of the steel wire rope at the end of the lifting container are used to analyze the degree of over winding of the friction lifting system,and at the same time provide an important theoretical basis for the selection,verification and inspection of the steel wire rope.(3)The dynamic model of the multi-rope friction hoisting system is established,and the special conditions of the slip rope and loose rope in the process of over-coil protection are analyzed and studied.MATLAB is used to simulate and analyze the speed,acceleration,displacement and The tension curve of the steel wire rope was compared and analyzed,and the influence degree of the loose rope and the slip rope on the hoisting system was obtained,which provided theoretical guidance for the prevention and control of the loose rope and the slip rope.(4)The force analysis of the last anti-collision beam of the over-coiling protection of the friction hoist system,and the ANSYS impact simulation of the three existing types of anti-collision beams are provided to provide a reliable basis for the design of anti-collision beams.(5)Through calculation,the relationship between the braking force of the steel belt type over wind protection device and the thickness of the steel belt,the width of the steel belt and the diameter of the pressure roller are obtained.The analysis shows that adjusting the thickness of the steel belt is to enhance the braking force of the steel belt type over wind buffer device.The most effective method,on this basis,takes the TW mine hoisting system as an example to design the steel belt over wind buffer device steel belt,which provides an effective reference for the selection of the steel belt over wind protection device.Figure[50]Table[9]Reference[113]...