Abstract: The wear failures of the middle plates in the scraper conveyors became one of the main reasons for the malfunctions of the conveyors. In order to improve the wear resistance of the middle plates,the design of bionic middle plates was carried out based on the non-smooth units of dung beetles. The single factor and response surface method optimization tests were carried out with the amount of wear as the response value. According to the testing results of response surface method, the order of significant influence factors(from high to low) is radial distance, depth-diameter ratio, diameter, pitch angle. And the regression prediction model of wear amount and factors was established based on the testing results. By comparison of the tests, it is found that the relative errors between the prediction model and the real test are as 3.2%. Under the specific working conditions (particle size of coal powder is as 6~8 mm, load is as 20 N, scraper chain speed is as 0.65 m/s and testing time is as 6 600 s), when the depth-diameter ratio is as 1.41, the diameter is as 0.69 mm, the pitch angle is as 6.55° and the radial distance is as 4.66 mm, the wear amount is the least, the wear resistance of bionic middle plate is improved by 12.6%. By analyzing the mechanism of wear resistance, it is found that compared with the smooth plates, the bionic plate has less abrasive wear and adhesive wear. The pit distribution may destroy the coal particle movement on the surfaces of the continuous cutting middle plates. The bionic optimization of the middle plates may provide some references for the design of scraper conveyors in the future.

Key words: scraper conveyor； middle plate, wear resistance, bionic, optimization test

摘要： 刮板输送机中板磨损失效已成为输送机运行故障的主要原因之一，为了提高中板耐磨性，基于蜣螂非光滑单元进行了仿生中板设计，以磨损量为响应值，进行了单因素和响应面法优化试验。根据响应面法试验结果得到的因素显著性影响顺序（从高至低）依次为：径向距离，深径比，直径，节距角。基于试验结果建立了磨损量与因素的回归预测模型，经试验对比发现，预测模型与真实试验的相对误差为3.2%。在特定工况（煤散料粒度为6~8 mm、载荷为20 N、刮板链速为0.65 m/s及试验时长为6 600 s）下，当深径比为1.41、直径为0.69 mm、节距角为6.55°和径向距离为4.66 mm时，磨损量最小，仿生中板的耐磨性提高了12.6%。分析其耐磨机理发现，与光滑板相比，仿生板的磨粒磨损及黏着磨损较轻。凹坑分布可破坏持续切削中板表面的煤粒运动状态。中板的仿生优化可为今后刮板输送机的设计提供一定参考。

关键词: 刮板输送机, 中板, 耐磨, 仿生, 优化试验