快速成型技术在塑料模具制造中的应用

介绍了基于快速成型技术的塑料模具的制造,并提出了一些需要解决的问题。     

FU270链运机输送链条翻链的处理措施

<正>1存在问题FU270型链式输送机是一种水平(或倾斜≤15°)输送粉状、颗粒状物料的产品,见图1。它的主要运载机构包括中间机壳以及在中间机壳内的上、下轨道及在中间机壳内循环转动的输送链条。装有下轨道,为防止输送链和侧板、底板摩擦。装有上轨道.以托住回程链条,并防止链条与侧板相摩擦。输送链主要由L型钩子、内链板、外链板、滚子等组成。我公司2013年9月份生产制造的     

Fluidic origami with embedded pressure dependent multi-stability: a plant inspired innovation

Inspired by the impulsive movements in plants, this research investigates the physics of a novel fluidic origami concept for its pressure-dependent multi-stability. In this innovation, fluid-filled tubular cells are synthesized by integrating different Miura-Ori sheets into a three-dimensional topological system, where the internal pressures are strategically controlled similar to the motor cells in plants. Fluidic origami incorporates two crucial physiological features observed in nature: one is distributed, pressurized cellular organization, and the other is embedded multi-stability. For a single fluidic origami cell, two stable folding configurations can coexist due to the nonlinear relationships among folding, crease material deformation and internal volume change. When multiple origami cells are integrated, additional multi-stability characteristics could occur via the interactions between pressurized cells. Changes in the fluid pressure can tailor the existence and shapes of these stable folding configurations. As a result, fluidic origami can switch between being mono-stable, bistable and multi-stable with pressure control, and provide a rapid ‘snap-through’ type of shape change based on the similar principles as in plants. The outcomes of this research could lead to the development of new adaptive materials or structures, and provide insights for future plant physiology studies at the cellular level.     

离子液体中α,β-不饱和化合物的绿色合成

芳香醛和活泼亚甲基化合物为原料,在离子液体中进行Knoevenagel缩合反应。本工艺避开了传统方法中在加入催化剂的有机溶剂中进行Knoevenagel缩合反应的步骤,采用离子液体为反应提供环境和催化,具有操作简单、成本低、对设备无特殊要求和环境友好的优点。