三轴自同步变轨迹椭圆振动筛的轨迹仿真及动态特性分析

发布时间：2018-04-11 14:31

本文选题：自同步 + 变轨迹　；参考：《江西理工大学》2015年硕士论文

【摘要】：椭圆轨迹振动筛同时具有圆轨迹振动筛和直线轨迹振动筛的优点,物料颗粒在筛分面上既可获得较高的输送速度,又具有较好的料层松散效果,能够有效地提高振动筛的产量和筛分质量,在筛分机械等相关领域得到广泛应用。某矿山设备厂生产的3TSK1860振动筛由于采用齿轮强迫同步方式,在使用中存在侧板激振器孔处容易发生变形开裂、齿轮箱漏油等现象,给设备的维护和保养带来了不便。变轨迹振动筛能够实现筛面入料端的速度和抛掷指数均大于出料端,可有效的提高振动筛的筛分效率和生产效率。以提高振动筛筛分效率、生产率和改善侧板受力为目的,研发3TSK1860自同步变轨迹振动筛,主要完成以下研究工作:(一)调整了原振动筛筛箱结构,采用三台同型号电机通过万向节联轴器驱动三组激振器工作,并在Solid Works中建立其三维模型,根据振动筛的三维模型建立了振动筛的受力模型,在多电机振动系统自同步理论的基础上分析了偏心块在稳定相位差下运转的同步性条件和稳定性条件;(二)在振动筛受力模型的基础上建立了自同步振动系统的振动微分方程,并进行了求解,利用MATLAB软件分析了相位差稳定的偏心块在不同初始相位角运转时对筛箱质心轨迹的影响,结合振动筛工艺参数的选择标准确定偏心块的初始相位角为π/3;(三)由筛箱质心运动方程推导了筛箱上任一点的运动方程,利用MATLAB对筛箱运动轨迹进行了仿真及模拟点抛掷指数和速度的计算,其结果显示筛箱同一筛分面上入料端的抛掷指数及物料输送速度比出料端的大,这种变化趋势有利于物料的筛分与输送,可有效提高物料的筛分效率与生产效率;(四)通过对调整后的筛箱结构进行动态特性分析,通过模态分析检验振动筛工作中是否存在共振现象,由谐响应分析结果可知,最大应力发生在弹簧支承处为60.499Mpa,而在侧板激振器孔处及其它部位应力值较低,调整后的结构有效的改善了侧板的受力情况,筛箱许用应力66.2 Mpa,其强度满足设计要求。
[Abstract]:The elliptical trajectory vibrating screen has the advantages of the circular trajectory vibrating screen and the linear trajectory vibrating screen. The material particles can not only obtain higher conveying speed on the screen surface, but also have better material layer loose effect.It can effectively improve the output and screening quality of vibrating screen, and is widely used in screening machinery and other related fields.The 3TSK1860 vibrating screen produced by a mine equipment factory is easily deformed and cracked at the hole of the side plate exciter and the oil leakage of the gear box because of the use of the gear forced synchronizing mode, which brings inconvenience to the maintenance and maintenance of the equipment.The variable trajectory vibrating screen can realize the speed and throwing index of the inlet end of the screen surface is larger than that of the discharging end, which can effectively improve the screening efficiency and production efficiency of the vibrating screen.In order to improve screening efficiency, productivity and side plate force, 3TSK1860 self-synchronous variable trajectory vibrating screen has been developed. The following research work has been done: (1) the structure of the original vibrating screen box has been adjusted.Three groups of vibration exciters are driven by three identical motors through universal joint couplings, and their three-dimensional models are established in Solid Works. According to the three-dimensional model of the vibrating screen, the force model of the vibrating screen is established.Based on the self-synchronization theory of multi-motor vibration system, the synchronization and stability conditions of eccentric block operating under stable phase difference are analyzed. (2) the vibration differential equation of self-synchronous vibration system is established on the basis of the stress model of vibrating screen.The effect of the eccentric block with stable phase difference on the trajectory of the center of mass of the screen box under different initial phase angles is analyzed by using MATLAB software.The initial phase angle of the eccentric block is determined to be 蟺 / 3 (3). The motion equation of any point on the screen box is derived from the motion equation of the center of mass of the screen box.The motion trajectory of the screen box is simulated by MATLAB and simulated point throwing index and velocity are calculated. The results show that the throwing index and the material conveying speed at the end of the screen on the same screen surface are larger than those at the end of the discharge.This change trend is favorable to the screening and conveying of materials, and can effectively improve the screening efficiency and production efficiency of materials. (4) by analyzing the dynamic characteristics of the adjusted screen box structure,The resonance phenomenon is checked by modal analysis. According to the results of harmonic response analysis, the maximum stress is 60.499 Mpaat at the spring support, but the stress value is low at the hole of the side plate exciter and other parts.The adjusted structure can effectively improve the stress of the side plate. The allowable stress of the screen box is 66. 2 Mpa. its strength meets the design requirements.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD452

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