水稻收获机械抖动板加热脱附试验研究

Heating Anti-adhesion Experiments of Jitter Plate of Rice Harvesting Machinery

摘要:

为解决水稻收获机械物料抖动板表面极细小湿黏物料粘附的问题，提出了利用界面加热实现金属抖动板减粘脱附的方法。以镀锌板和不锈钢板两种基材为试验部件，以极细小湿黏水稻物料为试验对象，构建了湿黏水稻物料与金属抖动板表面的粘附界面模型，分析得出水膜的毛细作用是形成粘附界面的重要原因，揭示了金属抖动板表面加热对粘附界面的脱附作用机理。通过加载加热脱附试验，得到两种金属抖动板脱附率曲线模型，分析表明，粘附界面加热可以有效抑制湿黏水稻物料粘附在金属抖动板表面，当温度为50℃时，镀锌板和不锈钢板的脱附率分别达到61.81%和61.33%。振动加热脱附试验表明，金属抖动板的振动强度影响加热脱附效果，采用较低温加热、较高强度振动的方案，脱附效果更好，抖动板采用40℃加热，设定振频6Hz、振幅40mm的作业参数，脱附率超过65%，满足实际作业要求。验证试验表明，热气流加热是实现水稻收获机械抖动板与湿黏物料减粘脱附的有效方式。

Abstract:

Small, wet and sticky materials in rice threshed mixtures could be easily to adhere to the surface of metal jitter plate in cleaning device. A method to reduce the adhesion of wet sticky rice materials and metal jitter plate by interface heating was proposed. The Galvanized plate and stainless steel plate were used as test parts. The small wet sticky rice material was processed by crusher. Firstly, the model of adhesion interface between wet sticky rice material and metal jitter plate was constructed. The capillarity of water film was an important reason for the formation of adhesion interface. The anti-adhesion mechanism of interface heating of metal jitter plates was revealed. Secondly, loading and heating anti-adhesion test was carried out with electronic universal testing machine. The anti-adhesion rate curve models of Galvanized plate and stainless steel plate were obtained. The results showed that wet sticky rice materials were effectively inhibited to adhere to the surface of test parts through interface heating. The anti-adhesion rate of two kinds of metal jitter plates were respectively 61.81% and 61.33% when the temperature was 50℃. Then, vibrating and heating anti-adhesion test was carried out by using linear vibration test bed. The results showed that anti-adhesion rate was influenced by vibration strength of metal jitter plates. When the temperature of metal jitter plate was 40℃, the vibration frequency was 6Hz, and the amplitude was 40mm, the anti-adhesion rate exceeded 65%, which met the actual operation requirements. Finally, the verification test showed that the application of hot flow heating was an effective interface heating way to reduce adhesion between wet sticky rice materials and jitter plate in actual cleaning process.