压力和温升速率对摩擦提升机衬垫线膨胀系数的影响

Effect of load and heating rate on the coefficient of linear expansion of friction lining in a mine hoist

针对矿井摩擦提升机高速恶性滑动工况，以准确获得摩擦提升机摩擦衬垫的热一应力场为目的，选用常用摩擦衬垫G为研究对象，在热机械分析仪（ZRPY300）上开展研究，分析了不同压力（O～10N）和温升速率（1～5℃／rain）对摩擦衬垫线膨胀系数的影响规律．研究结果表明：在一定压力和温升速率下，随着温度的升高，衬垫线膨胀系数逐渐增加，当温度升至120℃时，曲线发生转折并呈现逐渐减小的趋势；当达到195℃左右时，曲线发生第2次转折，出现了再次增加的现象；在温升速率一定时，压力越大，对其曲线变化的影响越明显；当压力一定时，温升速率的变化对其曲线的影响较为复杂．最后，通过多元回归的拟合，得到线膨胀系数、温升速率及压力间的定量关系，可为高性能衬垫的研究提供一定的基础数据．

In view of the serious high speed slide of a mining friction hoist, aiming at calculating the lining＇s thermo-stress accurately, the most commonly used lining G was studied on thermal mechanical analyzer（ZRPY-300）, and the effect of load（0-10 N） and heating rate（l-5℃/min） on coefficient of linear expansion were analyzed. Experimental results show that the coefficient of linear expansion increases with the temperature increasing under the certain load and heating rate, and when the temperature reaches to 120 ~C, the curve occurres transition and then decrea- ses gradually. When the temperature reaches to 195 ~C, the curve occurres the second transition and then increases again. The coefficient of linear expansion is obviously with the load increasing under a certain heating rate, and the coefficient of linear expansion is complexity with the heating rate increasing under a certain load. Finally the fitting equation is obtained by the multiple re- gression analysis. Based on this study, the experiment results can supply the basic data for the design of high-performance lining.