用于煤矿井下充填的玻璃纤维增强聚氯乙烯热塑性复合管材的设计与制造

Design and manufacture of glass-fiber-reinforced PVC thermoplastic composite pipes for underground filling in coal mine

针对煤矿膏体输送所用的无缝钢管耐磨性差、更换困难等问题,制备了玻璃纤维增强聚氯乙烯热塑性复合管(PVC-RTP)用于煤矿井下充填,对管材的组成、连接方式、工艺流程和工艺参数进行了全面介绍,并检测了公称压力为9.5 MPa的管材的性能。结果表明,管材爆破压力为38.95 MPa,大于4倍公称压力;当试验压力为14.25 MPa、试验时间为100 h时,管材未破裂,未渗漏;试验压力为11.4 MPa、试验时间为1000 h时,管材未破裂,未渗漏;公称压力为11.4 MPa、ΔP/PN为48%,循环次数达到12000时,管材未破裂,未渗漏,具有质轻、高耐磨和耐蚀性能强的优点,能较好地满足煤矿膏体输送。

In view of the poor wear resistance and difficulty of replacement of seamless steel pipes used in coal mine paste delivery,the glass-fiber-reinforced PVC thermoplastic composite pipes(PVC-RTP)were developed for the use in the underground filling of coal mine,and their part composition,connection mode,process flow and process parameters were introduced comprehensively.The performance of the pipes at a nominal pressure of 9.5 MPa was also detected.The results indicated that the pipe exhibited a blasting pressure of 38.95 MPa,which was 4 times greater than the nominal pressure.There is no crack occurring in the pipe under the test time of 100 h and test pressure of 14.25 MPa.There is no leakage at 11.4 MPa.After 1000 h,the pipes showed no rupture and no leakage.At a nominal pressure of11.4 MPa and aΔP/PN ratio of 48%,the number of cycles reached 12000,and no rupture and leakage were observed.With the characteristics of light weight,high wear resistance,and strong corrosion resistant,the composite pipes can better meet the requirement for the transportation of coal mine paste.