基于哈弗滑块与齿轮脱螺纹的叉形体注塑模具设计

以带有倒扣与内螺纹的叉形体支架产品为对象,进行了相应的注塑模具设计。针对产品上端内外侧面倒扣特征及下端内螺纹特征同时存在的特点,通过设计哈弗滑块与齿轮脱螺纹机构,构建了模架组件、定模哈弗滑块组件、定模先抽芯组件和齿轮脱螺纹组件等4个关键组件,其中齿轮脱螺纹组件包括4个子组件,其分别为脱螺纹子组件、中间二级传动子组件、中间一级传动子组件和齿条驱动子组件。通过模具4次开闭模动作的设计,实现了叉形体注塑模具的自动脱模,在确保注塑产品质量的基础上实现了生产自动化。

Bubble Formation Characteristics from a Sieve Tray with Liquid Cross-flow

An apparatus, designed to simulate bubbling of sieve tray operatedin froth regime, was employed. Bubble contact angles in and above theincipient weeping regime for an air-water-plexiglas system wereinvestigated. The influence of both liquid cross-flow and gas up-flowupon bubble contact angles was examined. A model consider- Ing theinfluence of liquid cross-flow was developed to predict bubble sizefrom a sieve hole in froth operation regime. The comparison showsthat the bubble sizes predicted by the present model are consistentwith our experimental Values and the available published experimentaldata.