深井垂悬钢丝绳扭转特性及回收装置研究

发布时间：2018-04-15 05:18

本文选题：深井提升 + 垂悬钢丝绳　；参考：《太原理工大学》2017年硕士论文

【摘要】：多绳摩擦提升机在竖井中应用广泛,既负责设备、人员等的下放,又负责煤矿以及矸石等的提升。垂悬在井筒中的提升钢丝绳经过一定时间使用后,根据煤矿安全规程要进行更换。在更换、回收钢丝绳时,尤其深井井下回收,存在一定的安全问题:提升钢丝绳内部积聚有一定的扭矩,内部扭矩释放时,快速扭转的钢丝绳容易互相缠绕,更甚者窜动的绳端打伤作业人员;依靠人力拉拽回收钢丝绳,效率低,劳动力成本投入大。针对井下回收垂悬钢丝绳存在的问题,本课题在研究垂悬钢丝绳扭转特性的基础上,开发设计了一种回收装置,可以控制钢丝绳内部扭矩释放,利用机械力代替人力回收钢丝绳。本文以井下回收钢丝绳工艺为背景,从提升钢丝绳螺旋结构入手,阐述垂悬钢丝绳形成内部扭力的原因。结合垂悬钢丝绳静力学方程,对积聚在内部的扭矩和钢丝绳的弹性变形进行分析。以垂悬长度为650m,直径为46.50mm的钢丝绳为例,利用回归公式计算积聚在钢丝绳内部的扭矩,约为560N·m,以及钢丝绳下端处于平衡位置时,扭转位移约为118圈。从垂悬长度为650m的钢丝绳上截取七个区段进行仿真,得到区段扭转角的最大值和稳定值与区段距井底距离近似呈负线型比例关系。对七个区段的扭转角利用线性插值计算得到井底钢丝绳下端在扭转过程中最大角位移约为209.2圈,平衡位置的角位移约118.3圈。并对井底处19m长的钢丝绳进行仿真,得到扭力释放时间为240s时,钢丝绳分段的离心力可以减小到18.7N。提出了在井底钢丝绳下端设置控制扭力释放机构以降低钢丝绳扭转速度。设计了回收装置的驱动机构、夹紧机构、排绳与扭力释放机构。建立回收装置装配模型,在满载6.5t工况下利用RecurDyn对连续回收装置进行动力学仿真,得到钢丝绳与绳盘作用力在220N附近小幅度波动,与排绳器作用力在30N~50N之间变化,表明回收过程比较平稳。对回收装置机架进行模态分析,得到机架最小固有振动频率为28.877Hz,高于绳盘对机架的冲击激励频率2.34Hz。对机架进行瞬态动力学分析,得到在装置启动过程中机架最大位移为1.1891mm,最大应力为78.473MPa,远小于机架材料的屈服极限235MPa。通过上述研究证明本课题设计的连续回收装置应用于井下回收钢丝绳是合理可行的。
[Abstract]:The multi-rope friction hoist is widely used in the shaft, which is responsible for the equipment, personnel, etc., as well as the coal mine and gangue.The hoisting wire rope suspended in the shaft is replaced according to the coal mine safety regulations after a certain time of use.In replacing and recovering wire rope, especially in deep well, there are certain safety problems: there is a certain amount of torque in the lifting wire rope, and when the internal torque is released, the fast twisting wire rope is easy to twine each other.What's more, the moving rope injured the operator; relying on the manpower to pull and recover the wire rope, low efficiency and high labor cost.In view of the problems existing in the downhole recovery of suspended wire rope, on the basis of studying the torsional characteristics of the vertical hanging wire rope, a recovery device is developed and designed, which can control the internal torque release of the wire rope.Use mechanical force instead of human recovery wire rope.Based on the technology of underground recovery wire rope, starting with the spiral structure of hoisting wire rope, this paper expounds the cause of forming internal torsion of vertical hanging wire rope.Based on the static equation of hanging wire rope, the internal torque and elastic deformation of wire rope are analyzed.Taking the wire rope with a vertical suspension length of 650 m and a diameter of 46.50mm as an example, the torsional moment accumulated in the wire rope is calculated by regression formula, which is about 560 nm, and the torsional displacement is about 118 circles when the lower end of the wire rope is in the balance position.Seven sections were intercepted from the wire rope with a vertical length of 650 m for simulation. The maximum and stable values of the torsion angle of the section were approximately in a negative linear proportion to the distance from the bottom hole of the section.The maximum angular displacement of the lower end of the wire rope in the bottom hole is about 209.2 cycles and the angular displacement of the equilibrium position is about 118.3 cycles by linear interpolation for the torsion angle of the seven sections.The results show that the centrifugal force of the wire rope segment can be reduced to 18.7Nwhen the torque release time is 240s.In order to reduce the torsional speed of the wire rope, a torsion releasing mechanism is set up at the bottom of the shaft.The drive mechanism, clamping mechanism, rope arrangement and torsion releasing mechanism of the recovery device are designed.The assembly model of the recovery unit was established, and the dynamic simulation of the continuous recovery device was carried out by using RecurDyn under the condition of 6.5t full load. It was obtained that the action force of the wire rope and the rope plate fluctuated slightly in the vicinity of 220N, and the force of the wire rope was changed between the 30N~50N and the rope rower.It shows that the recovery process is relatively stable.Modal analysis shows that the minimum natural vibration frequency of the frame is 28.877 Hz, which is higher than the impulse frequency of 2.34 Hz.The transient dynamic analysis shows that the maximum displacement and stress of the frame are 1.1891 mm and 78.473MPa, which are much smaller than the yield limit of the frame material (235 MPA).It is proved by the above research that the continuous recovery device designed in this paper is reasonable and feasible for underground wire rope recovery.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD532

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