新型反共振振动筛的动力学分析与改进设计

Dynamic Analysis and Improved Design of A New Type of Anti Resonance Vibrating Screen

振动筛在选煤厂中主要用于筛分及选后产品的脱水与脱介,振动筛在工作时要妥善处理好其带给地基的动负荷问题,使用普通一、二次隔振振动筛隔振效果仍有改进的空间。反共振技术在选煤厂中主要应用于离心脱水机。当反共振技术应用于振动筛时,可以实现筛分、选煤厂选后产品脱水脱介的目的,可以大幅减少工作时所需激振力、给地基带来的冲击负荷以及噪音,在达到工作目的的同时还可以节能降耗。改进设计时通过分析反共振振动筛的力学模型,结合上、下两个质体的振动特点列出整个系统的运动微分方程,未忽略阻尼的模态动力学计算分析较为复杂,计算中可采用复数法对振幅、频率进行求解。整机的优化设计相较于初步设计除外观的改变外,对上、下质体的结构、材料分别进行优化,对不同位置的弹簧等关键零部件也进行了设计细化,从而使整机各项指标可达到工作要求。

The vibrating screen is mainly used in coal preparation plants for screening and dehydration and media removal of selected products.During operation,the vibrating screen should properly handle the dynamic load problem it brings to the foundation.There is still room for improvement in the vibration isolation effect of using ordinary primary and secondary vibration isolation vibrating screens.Anti resonance technology is mainly applied in centrifugal dewatering machines in coal preparation plants.When the anti resonance technology is applied to the vibrating screen,it can achieve the purpose of screening and dewatering and media removal the selected products in the coal preparation plant.It can greatly reduce the required excitation force during operation,the impact load on the foundation,and noise.While achieving the working purpose,it can also save energy and reduce consumption.When improving the design,through analyzing the mechanical model of the anti resonance vibrating screen,and the motion differential equations of the entire system are listed combined with the vibration characteristics of the upper and lower plastids.The modal dynamics calculation analysis without ignoring damping is more complex,and the complex number method can be used to solve the amplitude and frequency in the calculation.Compared to the preliminary design,the optimization design of the entire machine not only involves changes in appearance,but also optimizes the structures and materials of the upper and lower plastids,and refines the design of key components such as springs at different positions and others,so that various indicators of the entire machine can meet the working requirements.