基于煤样筛分的筛上物料动态特性研究

发布时间：2018-03-30 02:06

本文选题：筛分设备　切入点：筛上物料　出处：《中北大学》2017年硕士论文

【摘要】：在煤炭生产、加工以及使用过程中,煤炭的制样与检测十分必要。筛分装置是煤质制样过程中的重要环节,物料的筛分效果将直接影响着后续检测结果的准确性。而当前制样过程关键筛分设备的体积较大、笨重且不宜携带,所以专门针对煤质分析检测的小型化筛分装置及其筛上物料的动态特性研究有着重要的现实意义。通过对国内外现有筛分装备技术与筛分机理的综合分析,运用动力学理论及虚拟样机仿真,并结合实验验证,对筛上单颗粒物料的动态特性进行了深入的研究,得出了有益结论。首先,通过广泛分析现有的筛分装置及技术,设计了一种筛网倾斜式小型旋振筛分装置,运用了运动质点动力学理论得到了该筛分装置筛上物料的动力学方程,并进行了正确求解,提出在该装置上物料的运动轨迹为一条螺旋曲线。其次,以单颗粒筛分理论为基础,利用ADAMS得到了该筛分装置筛上物料在不同的电机转速、弹簧刚度以及筛面倾角等可变条件下的运动轨迹、速度及角速度曲线,确定了合理的筛面倾角、电机转速和弹簧刚度的取值范围。最后,制造了旋振筛样机,并进行了实验验证,得出了物料的筛分效率与所需筛分时间的变化曲线,实验表明仿真结论与实际结果相符,从而获得了筛上物料动态特性效果最佳时所对应的实际设计参数集合。本论文所设计的筛分装置还具有体积小、重量轻等优点,研究结论可以在小型化筛分装置的设计与集成方面提供重要依据,并为筛上单颗粒物料的动态特性及相关后续研究奠定理论基础。
[Abstract]:In the process of coal production, processing and use, it is necessary to make and detect coal samples. The screening device is an important link in the process of coal quality sample preparation. The screening effect of materials will directly affect the accuracy of the subsequent test results. However, the key screening equipment in the current sample making process is large in volume, bulky and unsuitable for carrying. Therefore, it is of great practical significance to study the dynamic characteristics of the small size sieving device and the material on the screen, which is specially designed for the coal quality analysis and detection. Through the comprehensive analysis of the existing screening equipment technology and screening mechanism at home and abroad, By using dynamic theory and virtual prototyping simulation, and combining with experimental verification, the dynamic characteristics of single particle material on the screen are studied in depth, and some useful conclusions are drawn. Firstly, through the extensive analysis of the existing screening equipment and technology, A small rotary vibration screening device with inclined sieve was designed. The dynamic equation of the material on the screen was obtained by using the kinetic theory of moving particle, and the correct solution was carried out. The moving path of the material on the device is presented as a spiral curve. Secondly, based on the theory of single particle screening, the different motor speeds of the material on the screen are obtained by using ADAMS. The motion track, velocity and angular velocity curves under variable conditions, such as spring stiffness and sieve inclination angle, are determined. The reasonable range of sieve angle, motor speed and spring stiffness is determined. Finally, a rotary vibrating screen prototype is made. The experimental results show that the sieving efficiency and the required screening time change curve. The simulation results show that the simulation results are consistent with the actual results. Thus, the set of practical design parameters corresponding to the optimal dynamic characteristics of the material on the screen is obtained. The sieve device designed in this paper also has the advantages of small volume and light weight. The research results can provide important basis for the design and integration of the miniaturized sieve device and lay a theoretical foundation for the dynamic characteristics of the single particle material on the screen and related subsequent research.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ53;TQ051.894

【参考文献】