An Experimental Investigation into the Feed Rate Capacity of Rotary Valve and Blow Tank Feeders

Industry widely uses rotary valves and blow tanks for the pneumatic conveying of products, each having their pros and cons depending on the specific application. This article shows the differing results obtained when low-velocity conveying a product through a common pipeline using both a drop-through rotary valve and a bottom-discharge blow tank feeder. A number of issues arise in the rotary valve system, the main one being rotary valve air leakage. A blow tank system, on the other hand, does not leak, as it is an enclosed system. The experimental results show dramatic differences in product throughput. Further exploration leads to a novel modification being made to the rotary valve system in an attempt to increase its capacity. The result of this modification shows a slight increase in output tonnage, but still significantly less than that obtained from the blow tank.     

三聚氰胺粉料后处理工艺技术改造

经过技改后的三聚氰胺粉料后处理工艺，克服了以往采用螺旋输送机冷却和正压输送工艺所带来的工作环境恶劣、产品因温度较高而不易包装、机械故障频繁等许多难以解决的问题。改用吸送式气力输送后处理工艺后，既能输送，又能冷却、提纯三聚氰胺，实现自动化包装，并彻底改善工作环境。     

计算机控制与检测气动换向阀试验台

介绍一种采用计算机控制与检测气动换向阀试验台的特点和测试系统设计。     

烧结粉尘采用机械输送与气力输送的比较

介绍了烧结厂输灰采用机械输送及气力输送两种方式各自的特点,以实际工程为例,通过技术经济比较可知：气力输送方式在技术上具有较大的优越性,而运行费用较高,但其综合效益要远优于机械输送,在烧结领域值得大力推广。     

燃气轮机气动执行器故障及解决

解决了镇海联合循环电厂PG9171E型燃气轮机启动时因气动执行器前减压阀故障而威胁燃机的运行和安全生产的问题,介绍相关的故障诊断方法及经验.     

Fundamental investigation of plug conveying of cohesionless particles in a vertical pipe (pressure drop and friction of a stationary plug)

A stationary packed bed of cohesionless particles is set up in a vertical pipe for the fundamental study of plug conveying. The effect of flow acceleration or deceleration on the pressure drop of the plug is investigated first. It is found that the pressure drop increases due to the flow acceleration and vice versa. Next, the following three kinds of experiments were made for the study of friction characteristics: 1. Friction between the plug and moving wall without air flow, 2. Friction between the plug and wall with downward air flow, 3. Friction between the plug and wall with upward air flow. The results are compared with the theory established in powder mechanics. The state of stress being of the active or passive case is discussed. Finally the problem of particles raining down from the back of the plug is studied. It is shown that the air velocity necessary to support the particles can be calculated based on a simple analysis of pressure distribution around the particles.     

阿 雅 马里斯等气力压运设计计算方法的分析

本文通过对对阿．雅．马里斯等气力压运设计计算方法的分析，归纳出该方法的适用范围。     

两叶与三叶转子气冷式罗茨真空泵气动噪声分析

气冷式罗茨真空泵的噪声主要由机械噪声和气动噪声组成,气动噪声具有强度高、危害大的特点,是气冷式罗茨真空泵的主要噪声.应用FLUENT软件动态模拟泵的内部流场,对两叶、三叶转子的气冷式罗茨真空泵的气动噪声进行比较,分析气动噪声产生的来源,为设计低噪声的气冷式罗茨真空泵提供参考.同时对两种转子的气冷式罗茨真空泵的噪声进行测试,三叶转子的气冷式罗茨真空泵的噪声明显低于两叶转子的气冷式罗茨真空泵.     

分切打叶工艺设备的研究与应用

目前在实施分切打叶时主要存在3个问题,即传统的铺叶切断设备无法满足分切打叶工艺精确控制烟叶分切比例的要求,以及如何提高叶基烟叶的打叶效率与非叶基烟叶的风分效率.为此,对目前国内使用的分切打叶工艺与设备进行了研究,确定在分切打叶中使用烟叶智能定位装置控制烟叶的分切比例,采用吹式打叶技术提高叶基烟叶的打叶效率,采用分流式风分技术提高非叶基烟叶的风分效率.试验结果表明,分切打叶工艺设备与传统全叶打叶机组相比,以中部烟为例,出片率提升0.42％,大中片率提升2％左右,碎片率降低0.4％,有助于烟叶的充分利用和纯化烟叶品质.     

气动书籍包装机的设计与研究

为提高书籍包装的效率,设计一种结构新颖、性能稳定的气动书籍包装机,实现书籍自动装袋包装的功能。利用MATLAB和ADAMS建立运动力学数学模型并进行仿真,利用ANAYS进行关键部件的有限元分析,最后进行实际测试。该包装机关键零部件满足强度与硬度要求,减少了书籍包装的时间,包装成功率高。该气动书籍包装机性能稳定,可以连续高效地实现书籍包装功能,具有较高的经济效益。