瞬时电控气动换挡机构设计与分析

换挡系统的性能直接影响赛车行驶的动态特性,针对FSAE方程式赛车换挡系统的缺点,结合赛车构架和实际需求,通过对气动元件的选型,设计一套电控气动换挡装置,通过作用于序列式变速箱来完成换挡,使整车更趋向于电控智能化.利用SolidWorks软件对系统各元件进行设计建模,验证了设计的可行性和稳定性.

Mechanism of electro-hydraulic exciter for new tamping device

A new tamping device which is driven by an electrohydraulic exciter was proposed to overcome the limitations of mechanically driven devices.The double-rod oscillation cylinder drives the tamping arm to realize vibration.A new spin valve was designed in order to fulfill dynamic state requirements of the oscillation cylinder.Parametric analysis was carried out by establishing mathematic model.Then,the relationships among the structure of valve port and the frequency,amplitude,output shock force of the cylinder were researched.An experimental device of the electrohydraulic exciter was established to validate the theoretical results.The signals were acquired by AVANT dynamic signal analyser of vibration.The results show that new tamping device can satisfy all kinds of complex working conditions with the flexible adjustment of frequency and amplitude.

起重永磁铁研究现状及展望

起重永磁铁是把强磁材料作为磁源,将铁磁性工件进行吊装和搬移的装置。相较于传统的起重电磁铁,起重永磁铁具有零耗电,没有繁杂的附属设备,高吸重比,吸力规格无限制等特点。文章介绍了发展起重永磁铁的重要性及其工作原理,并根据起重永磁铁卸重原理的不同将其分为强迫式起重永磁铁和磁路自闭合式起重永磁铁两大类。而磁路自闭合式起重永磁铁又根据消磁方式的不同再细分为转动式起重永磁铁和平移式起重永磁铁。总结了顶杆式起重永磁铁、平移式起重永磁铁、手柄式起重永磁铁、棘轮驱动起重永磁铁、链轮驱动起重永磁铁、齿轮驱动起重永磁铁和液压驱动起重永磁铁的磁路变换机构和工作原理。并对永磁起重技术未来的发展做出展望和建议。

电脑横机新型推针三角控制装置的设计与改进

本文介绍了一种电脑横机新型推针三角控制装置的设计及改进。该控制装置包括步进电机、齿轮、推针三角连杆以及推针三角导向座。通过对该装置重新设计,使得每个系统中的新型推针三角能够实现单独控制,且电路结构简单,成本低,同时配合选针算法,得以实现电脑横机对织物的高效编织。