聚四氟乙烯涂层滚筒防冻粘特性的试验研究  

EXPERIMENTAL STUDY ON ANTI-FREEZING ADHESIVE ROLLER WITH PTFE

作　　者：王春华[1] 曲辉[1] 王仲娴[1] 许瀚文[1] 

机构地区：[1]辽宁工程技术大学,阜新123000

出　　处：《机械强度》2016年第4期698-702,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51374120)资助~~

摘　　要：为了研究我国冬季露天矿运煤过程中改向滚筒冻结煤泥问题,采用自主设计加工的实验装置,模拟生产现场,研究了不同材料,在不同温度和不同的冷冻时间的条件下冻粘特性的变化情况。结果表明不同材料与干基含水率40%的煤泥之间的冻粘强度不同,其中聚四氟乙烯(PTFE)材料在法向和切向的冻粘强度均比其他材料低,在-25℃,冷冻2.5小时的情况下切向冻粘系数为0.037 MPa,法向冻粘系数为0.076 MPa,是相同情况下的超高分子量聚乙烯(UHMW-PE)材料法向冻粘系数的1/3左右,是其切向冻粘系数的1/6左右;是Q235材料法向冻粘系数的1/44左右,是其切向冻粘系数的1/19左右,说明了PTFE具备良好的防冻粘能力。试验还表明温度对冻粘强度有一定影响,但不呈线性关系;冷冻时间大于3小时后冻粘强度变化比较小;材料的切向冻粘系数通常大于法向冻粘系数;界面冻粘强度与实验添加煤样的多少无关。In order to study the turnabout roller coal slime freezing adhesion problem in the process of open-pit mine during winter,experimental apparatus was designed by ourselves,simulated the production site,studied the change of freezing adhesive characteristics of different material in different temperature and different freezing time condition. The results show that different materials and dry basis moisture content 40% of the coal slime have different freezing adhesive strength,among them PTFE material in normal and tangential freezing adhesive strength is lower than other materials,2. 5hours at- 25℃,normal freezing adhesive coefficient is 0. 037 MPa,tangential freezing adhesive coefficient is 0. 076 MPa,it is about 1 /3 of UHMW-PE material ＇s normal freezing adhesive coefficient,and about 1 /6 of it＇s tangential freezing adhesive coefficient; it is about 1 /44 of Q235 material＇s normal freezing adhesive coefficient,and about 1 /19 of it＇s tangential freezing adhesive coefficient,It illustrates PTFE has good antifreezing adhesive ability. Tests also show that temperature of freezing adhesive strength has a certain influence,but is not a linear relation; After 3 hours freezing adhesive strength change is small; Material of tangential freezing adhesive coefficient is usually larger than normal freezing adhesive coefficient; Surface freezing adhesive strength is independent of how much coal sample.

关 键 词：滚筒 冻粘 聚四氟乙烯(PTFE) 冻粘系数 煤泥 

分 类 号：TD57[矿业工程—矿山机电] TD528