基于磁场磁力的铁粉纸屑分离机构设计

Separating mechanism design for iron powder and paper scraps based on magnetic force

为了解决纸基蜂窝芯零件基于磁场和摩擦吸附原理固持方法中作为固持介质的铁粉在零件加工过程中掺杂蜂窝芯纸屑而不能重复使用的问题,提出基于磁场磁力的铁粉纸屑分离机构设计方案.根据蜂窝芯纸屑的存在形式,分离机构采用摆动筛和磁性分离的两级分离方式.根据摆动筛连杆机构的特性分析,采用调节偏心轮电机转速的方式来控制摆动筛的摆动频率.根据滚筒机构的结构形式,计算得到铁粉区域磁感应强度值应不小于0.107T,采用调节滚筒驱动电机转速的方式来控制平带上吸附铁粉的厚度.根据有限元分析对比结果,采用带有导磁极的激磁组件结构形式,导磁极厚度应取15～20mm,空气间隙应取20～25mm.

An ingenious mechanism based on magnetic force was designed for separating iron powder and paper scraps in order tO solve the problem that iron powder which was used as medium to fix honeycomb workpiece was polluted by paper scraps after milling machining process in the honeycomb fixture method based on magnetic and friction force. The two step separation method, swing sieve followed by magnetic separating, was adopted according to the form of scraps. Through characteristic analysis of linkage mecha- nism, a way to control swing frequency by adjusting motor speed of eccentric wheel was accepted. Accord- ing to the roller structure, magnetic field intensity value of iron powder area was calculated, not less than 0. 107 T, and a way to control iron powder thickness by adjusting motor speed of roller was applied. Mag- netic subassembly structure with guide pole was selected through finite element analysis and result con- trast. Guide pole thickness should be 15~20 ram, and air gap should be 20~25 mm.