摘要
为分析煤粒度对煤炭运输设备上煤冻粘强度的影响规律及原因,应用研制的冻粘强度测试装置,分别进行六种不同粒度煤样在超高分子量聚乙烯、橡胶和Q235三种典型运输设备材料上的冻粘强度试验。结果表明:随着粒度从d<0.1 mm逐渐增大至d>2 mm,煤样在三种材料上的冻粘强度普遍降低,煤粒度小,其冻粘界面连续致密,与基体接触面积大,同时基体表面对煤颗粒的吸附作用强,导致冻粘强度大,煤粒度大,冻粘界面有较多空隙缺陷,与基体接触面积小,吸附作用弱,导致冻粘强度小;相同粒度煤样在Q235材料上冻粘强度较大,普遍高于橡胶和超高分子量聚乙烯材料,尤其当粒度很小时(d<0.1 mm),煤与Q235材料表面间的冻结强度可能超过冻煤自身冻结强度,分离或清除冻粘煤时易发生冻煤自身的断裂。
The freezing adhesive strength was be relevant to the granularity of coal. To investigate the influence and laws, the freezing adhesive strength of coal with six different granularities on three typical transportation equipment material UHMWPE, rubber and Q235 were tested respectively by using the freezing adhesive strength test device. According to the result, the surface quality of slime and ice of freezing adhesive boundary and the adsorption between matrix material and coal were influenced by the granularity of coal. The surface of slime and ice was continuous and compact and has bigger contact area with matrix material when the granularity was smaller, and the adsorption between matrix material and coal was stronger the granularity was smaller. So the freezing adhesive strength was bigger. The situation was the opposite when the granularity was bigger. The freezing adhesive strength of coal on Q235 was bigger than UHMWPE and rubber with the same granularity. The freezing adhesive strength of boundary was possibly bigger than the freezing adhesive strength of frozen coal itself when granularity was 〈0. I mm on Q235, and the shear of frozen coal itself occurred easily when separation and clean were done.
出处
《机械设计与研究》
CSCD
北大核心
2017年第6期154-157,共4页
Machine Design And Research
基金
国家自然科学基金资助项目(51374120)
