大型原点反共振振动筛的初步设计

Preliminary design of large-scale origin antiresonant vibrating screen

针对传统大型振动筛筛箱侧帮易断裂,参振质量大,隔振效果差等问题,提出了将反共振理论用于振动筛的设计理念,建立了反共振振动筛的力学模型,并进行动力学分析,得到筛箱和下质体稳态时的响应振幅,通过绘制双质体系统的幅频特性曲线得到反共振振动筛的激振频率。利用Solidworks软件对反共振振动筛进行三维建模,完成了大型原点反共振振动筛的初步设计。结果表明:可调激振器位置的斜面设计使激振力通过上质体质心,保证了筛箱的正常工作。由圆柱形螺旋弹簧组成的弹簧座连接上、下质体及地面,保证了系统所需弹性系数;通过应用PID控制技术监控上下质体振幅,并改变激振频率来稳定上、下质体振幅,实现原点反共振振动筛振幅的稳定性控制。

The lateral wall of traditional large vibrating sieve box was easy to broke,the part of the vibration mass was high and vibration isolation effect was poor. To resolve the above problems,adopted the anti-resonance theory to design vibrating screen. The model of antiresonant vibrating screen was built,the motion equation of antiresonant vibrating screen was achieved. Worked out the amplitude of the steady-state response and the next screen box when it was plastid. Drawed a amplitude-frequency characteristic curve of the double mass system,and calculated out the excitation frequency of antiresonant vibrating screen when it was working. Achieved anti-resonance vibrating screen 3D model through Solidworks software,and complete preliminary design of the antiresonant vibrating screen. The results show that,the bevel on which the position of exciter can be adjusted allows the exciting force line go through the mass centroid. The design ensures the normal operation of the screen box. The spring seats which consist of cylindrical coil springs connect upper mass,lower mass and the ground,ensure the elasticity coefficient required by the system. The amplitude of the upper and lower mass can be monitored and controlled through proportion integration differentiation technology. The amplitude of origin antiresonant vibrating screen can be stabilized by changing the excitation frequency.