镐型截齿力学特性试验研究与双联镐齿截割数值模拟

发布时间：2019-07-01 20:59

【摘要】：采煤机依靠滚筒上的截齿破碎煤岩,截齿截割性能将直接影响着煤岩截割的效率和采煤机整机的性能。为探索高效率、低能耗的煤岩截割方法,定量分析镐型截齿的力学性能,采用试验研究、理论分析和仿真模拟相结合的研究方法,分析相关因素对截割性能的影响,探究双联镐型截齿同步截割煤岩的力学性能。以煤岩截割理论为基础,建立镐型截齿旋转截割试验台;以抗压强度作为参考量,完成试验模拟煤壁的制作。阐明试验测试载荷与截齿三向力的关系,通过试验测试的轴向载荷表征截割阻力的大小及规律,以试验数据为基础,定量分析截齿切向安装角、切削厚度对截割阻力(轴向载荷)的影响,并给出相应的关系式;应用最大似然估计法分析三种类型截齿侧向力的分布规律,指出叶片上截齿自旋转的可能性,以及滚筒上位置的不同对截齿侧向力的影响。基于分形几何理论,给出表征截割性能分形特征量(盒维数和粉煤量比例系数)的算法。以试验数据为基础,在不同安装角和切削厚度条件下,研究截齿的盒维数、比例系数与安装角和切削厚度的关系,并建立了关系式;基于单因素试验,以理论推导结合试验测算为研究方法,建立镐型截齿旋转截割煤岩的比能耗模型。利用ABAQUS有限元软件对双联镐型截齿旋转截割煤岩的过程进行仿真模拟,分析双齿同步作用时煤岩的破碎形式,针对不同切削厚度和截线距条件,分析截齿的截割性能,给出双联镐型截齿破碎煤岩的截割阻力;根据不同切削厚度和截线距条件,分析双齿截割时应力耦合作用对截割阻力的影响;与单齿顺序式截割相比,双齿同步作用提高了截割性能。研究成果为高效的滚筒式采煤机工作机构设计提供参考依据,为实现个性化滚筒设计和整机受力分析奠定基础。
[Abstract]:The shearer depends on the cutting teeth on the drum to break the coal and rock, and the cutting performance will directly affect the efficiency of coal and rock cutting and the performance of the whole shearer. In order to explore the high efficiency and low energy consumption coal and rock cutting method and quantitatively analyze the mechanical properties of pick cutting teeth, the mechanical properties of coal and rock cutting with double pick cutting teeth were analyzed by means of experimental research, theoretical analysis and simulation, and the influence of related factors on cutting performance was analyzed. Based on the theory of coal and rock cutting, a pick cutter rotating cutting test bed is established, and the compressive strength is used as the reference quantity to complete the manufacture of simulated coal wall. The relationship between the test load and the triaxial force of the cutting tooth is expounded. The magnitude and law of the cutting resistance are characterized by the axial load tested. Based on the test data, the effects of the tangential installation angle of the cutting tooth and the cutting thickness on the cutting resistance (axial load) are quantitatively analyzed, and the corresponding relations are given. The maximum likelihood estimation method is used to analyze the distribution of the lateral force of three types of cutting teeth, and the possibility of self-rotation of the cutting teeth on the blade is pointed out, and the influence of the position on the drum on the lateral force of the cutting teeth is pointed out. Based on the theory of fractal geometry, an algorithm is given to characterize the fractal characteristic quantity (box dimension and pulverized coal proportional coefficient) of cutting performance. Based on the experimental data, the relationship between box dimension, proportional coefficient and installation angle and cutting thickness is studied under different installation angles and cutting thickness, and the specific energy consumption model of pick cutter rotating cutting coal and rock is established based on single factor test and theoretical derivation combined with experimental calculation. The process of double pick cutting coal and rock is simulated by ABAQUS finite element software, and the crushing form of coal and rock is analyzed, according to the condition of different cutting thickness and cutting line distance, the cutting performance of double pick cutting coal and rock is analyzed, and the cutting resistance of double pick cutting coal and rock is given, and the influence of stress coupling on cutting resistance is analyzed according to the condition of different cutting thickness and cutting line distance. Compared with single tooth sequential cutting, double tooth synchronization improves the cutting performance. The research results provide a reference for the design of efficient working mechanism of drum shearer, and lay a foundation for realizing individualized drum design and force analysis of the whole machine.
【学位授予单位】：黑龙江科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6

【相似文献】