相近刃缘条件下不同铲板结构的切削阻力研究

发布时间：2018-09-06 09:59

【摘要】：针对减小平面铲板切削倾角和加装水平铲刀2种方式,对平面铲板结构进行改进,并将2种方式得到的铲板分别视为简单铲板和复杂铲板。引入不同铲板结构刃缘相近的概念,使设计的3组简单铲板和复杂铲板具有相近刃缘前移距离,且平均前移距离分别为56.8,114.6和187.8 mm。以级配土为切削对象,采用自行设计的切削装置对3组铲板分别在30,60和90 mm这3种不同切削深度下进行土壤切削阻力对比试验。研究结果表明:有4组试验的简单铲板结构切削阻力小于复杂铲板结构的切削阻力,另有4组试验的2种铲板结构切削阻力基本接近,仅有1组试验的简单铲板结构切削阻力相对偏大。因此,在铲板切削刃缘相近的条件下,对于只考虑切削阻力的土壤切削过程,采用简单铲板结构代替复杂铲板结构是工程实际中有效可行的办法。
[Abstract]:Aiming at the two ways of reducing the cutting inclination of the flat shovel and installing the horizontal scraper, the structure of the flat shovel is improved, and the spade obtained by the two methods is regarded as a simple shovel plate and a complex shovel plate, respectively. By introducing the concept of edge similarity of different shovel structures, the three groups of simple shovel plates and complex shovel plates have similar edge forward distance, and the average forward distance is 56.8114.6 and 187.8 mm., respectively. Taking gradation soil as cutting object, three groups of shovel plates were tested under three different cutting depths of 30 ~ 60 and 90 mm by using a self-designed cutting device. The results show that the cutting resistance of the simple shovel plate structure with four groups of tests is smaller than that of the complex shovel plate structure, and the cutting resistance of the two kinds of shovel plate structures in the other four groups of experiments is close. The cutting resistance of the simple shovel plate structure with only one group of tests is relatively large. Therefore, under the condition that the cutting edge of the shovel plate is close, it is an effective and feasible method in engineering practice to replace the complex shovel plate structure with a simple spade structure for the soil cutting process which only takes into account the cutting resistance.
【作者单位】：长安大学道路施工技术与装备教育部重点实验室;西安特种设备检验检测院;
【基金】：国家科技支撑计划项目(2015BAF07B02)~~
【分类号】：TH69

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