刮板输送机是煤矿综采工作面大型输送设备，中部槽作为刮板输送机承载部件，其工作可靠性和使用寿命直接影响井下煤炭的输运效率。然而，现有的试验方法难以准确预测中部槽的输运状态和使用寿命。为深入研究煤散料在中部槽中的输运特征，散料对中板造成的磨损特征及其机理，利用离散元法建立了煤散料与刮板输送机中部槽耦合作用模型，采用校正后的模型参数对中部槽输运状态、中板的磨损、散料和中板的受力特征，包括不同满载情况下煤散料运动学形态、不同满载情况及不同含矸率下中部槽中板磨损，以及不同区域和不同满载情况下中部槽中板的受力进行预测研究。结果表明，煤散料在刮板输送机上分布具有“巴西果效应”，煤散料在中部槽不同区域的堆积质量有较大差异，运载量越大“巴西果效应”越明显；中板磨损主要集中在双排刮板链的正下方，该区域下磨损量远大于非链条排布区域；中部槽磨损量随着负载的增大而增大，140%负载下的磨损量是60%负载的3.49倍左右；中部槽磨损量随着含矸率的增大而增大，含矸率25%的煤散料对中部槽的磨损量是不含矸的4.11倍左右；刮板链下方中板所受法向平均载荷最大；负载越大，中部槽中板法向平均载荷越大。本研究可为中部槽不同区域进行相应的耐磨强化处理提供理论依据，可最大程度延长中部槽使用寿命。

Scraper conveyor is a large-scale conveying equipment for fully-mechanized coal mining face. The central trough is used as the load-bearing component of the scraper conveyor. Its working reliability and service life directly affect the transportation efficiency of underground coal. However, at present, the existing test methods are difficult to accurately predict the transport status and service life of central trough. In order to in-depth study the coal transport characteristics of the coal bulk materialin the central trough, the wear characteristics of the bulk materials and its basic principles, the coupling model of bulk coal and central trough was established by using discrete element method in this study. The corrected model parameters were used to predict the transport state of the central trough, the wear of the central plate, the force characteristics of the bulk materials and the central plate, including the kinematics of the bulk coal under different full loads, the wear of plate in the middle groove under different loads and different percentage of gangue, and the force of of the plate in the middle groove under different areas and different full load conditions. The results show that the distribution of bulk coal on the scraper conveyor has the“Brazil fruit effect”, and the accumulation quality of bulk coal in different areas of the central trough is quite different, and the larger the carrying capacity is, the more obvious the“Brazil fruit effect”; the wear of middle plate is mainly concentrated at the lower part of double-row scraper chain, and the wear amount under this area is much larger than that in the non-chain distribution area; the wear amount of the middle trough increases with the increase of load, and the wear amount of the central trough under 140% load was about 3.49 times of that under 60% load; the wear amount of the central trough increases with the increase of the gangue content, and the wear of the bulk coal with 25% gangue content on the central trough is about 4.11 times that of without gangue; the average normal load of the middle plate under the scraper chain is the largest; the greater the load, the greater the average normal load of the plate in the middle groove. This study can provide a theoretical basis for the corresponding wear-resistant strengthening treatment in different areas of central trough, and can extend the service life of the central trough to the greatest extent. 

0 引言

1 理论模型

   1.1 颗粒间接触模型

   1.2 颗粒与中部槽间的接触模型

   1.3 刮板(链条)-煤散料-中板接触分析

2 煤散料与刮板输送机中部槽的离散元耦合模型构建

   2.1 煤散料颗粒参数及模型颗粒间接触模型

   2.2 模型验证

3 中部槽输运状态预测

   3.1 煤散料运动学形态预测

   3.2 中部槽中板磨损预测

   3.3 中部槽受力预测

4 结果分析

   4.1 煤散料运动学形态

   4.2 中部槽中板磨损预测结果分析

   4.3 煤散料与中部槽受力情况分析

5 结论