三维并联振动筛设计与实验

Design and Experiment for Three-dimensional Parallel Kinematics Vibration Sieve

摘要:

提出用并联机构驱动产生的筛面多维运动实现非平面筛面多维透筛性的设计思想，以改善透筛环境、提高筛分效果。设计了一种基于单自由度两回路空间机构的并联振动筛，给出了主机构的拓扑结构分析、运动分析及基于筛面轨迹仿真的尺度优化结果；阐述了非平面筛面的设计及其多维透筛性原理；实验比较了并联振动筛与传统直线振动筛在常规平面筛面、非平面波浪筛面、非平面凹坑型筛面上的筛分性能，证明并联振动筛与非平面凹坑型筛面组合的筛分效率高达98%，透筛率高达7.4%，而直线筛与平面筛组合的筛分率仅为84%，透筛率为5%，从而揭示了新型并联振动筛的高效筛分机理与特性。

Abstract:

Instead of eccentric wheel vibrator and plane screen, a new design ideal was presented to take parallel mechanism and non-planar screen as drive source and screen, respectively. With the multi-dimensional spatial movement of parallel mechanism and the multi-dimensional permeability of non-planar screen, it can increase the screening efficiency. A parallel kinematics vibration sieve based on single DOF and two loops spatial mechanism was designed, then the topology structure of its main mechanism and kinematics based on the track of screen was analyzed and its dimensions were optimized. The design of non-planar screen and the principles of its multi-dimensional permeability was illustrated and the experimental effects of parallel kinematics vibration sieve and traditional line vibration sieve with planar screen, wave screen and pit screen were compared respectively, which verify that the screening efficiency of parallel kinematics vibration sieve with non-planar screen is as high as 98%, and the permeability is 7.4%, while the screening efficiency and permeability of line vibration sieve with planar screen is just 84% and 5%, respectively. So the efficient screening mechanism and characteristics of this new parallel kinematics vibration sieve can be revealed.