简单的双螺杆挤压设备的设计，制造和测试

简单的双螺杆挤压设备的设计，制造和测试(中文4400字,英文3200字)
S.A.M.A.N.S. Senanayake a, B. Clarke
摘要：简单的双螺杆食品挤压机被设计，制造和测试之后，紧接着大量的测试在斯里兰卡进行。它是用来满足一些特殊产品的的制造，而且期望能够应用于欠发达地区来扩大食品产品的生产范围。这个机器的生产能力为10Kg/h,大部分是用软钢制造而成。这个机器有两种螺杆，一种是14mm的螺距，另一种是具有14，,12和10三种变化的螺距。这个机器由2.2KW的可调电动机驱动。它还有电加热系统，拥有温度控制和压力感应功能。这款机器在一般的工厂里的制造成本约为2000英镑。大米和干香蕉的混合物被成功的挤压膨化为一种方便食品，是在机筒温度为120度，螺杆转速为125r/min，食品含有水分占15%并且挤出空的直径为3mm的时候挤出的。其它种类的螺杆在没有特别改进的情况下获得的挤压结果与此相似。 1999年Elsevier Science 有限公司的专利。

关键词：双螺杆挤压机；设计；低成本；休闲食品；连续烹；地方建设；谷物混合。

A simplified twin screw co-rotating food extruder: design, fabrication and testing
Abstract
    A simplified co-rotating twin screw food extruder was designed, fabricated and tested in England, followed by extensive testing in Sri Lanka. It was built as a model to meet the speci®c product and ®nancial constraints of less developed countries and was expected to be used in those countries to widen the production capabilities of extruded foods. The machine had an estimated delivery of 10 kg/h and was made mainly with mild steel. Two types of screw were made, one with a constant pitch of 14 mm and the other with varying pitch in segments of 14, 12 and 10 mm. The machine was powered by a 2.2 kW electric motor with electronic speed controls. The machine also had electrical heating with a temperature controller and a pressure sensing device. The cost of fabrication of the machine was estimated at £2000 with most of the parts built in a fairly simple workshop. A mixture of rice and dried banana was successfully extruded as a potential snack food and on the basis of maximum expansion the best results was obtained from a barrel temperature of 120°C, screw speed 125 rpm, feed moisture 15% and with a die ori®ce size of 3 mm. When the alternative compression screw was tested very similar results were achieved with no signi®cant improvement in product expansion. Ó 1999 Elsevier Science Ltd. All rights reserved.
Keywords: Twin screw extruder; Design; Low cost; Snack food; Continuous cooker; Local construction; Cereal mixtures
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