夹持输送式残膜回收装置的设计与试验

    Design and test of clamping and conveying device for recycling agricultural residual plastic film

    • 摘要: 针对现有残膜回收机存在残膜回收率低、残膜缠绕和脱膜困难的问题,依据残膜特性,设计了一种气力脱膜的夹持输送式残膜回收装置,该置主要由起膜机构、输送机构和气力脱膜机构组成,通过介绍夹持输送式残膜回收装置的工作过程,分析讨论确定起膜铲、夹持输送结构和脱膜机构的结构和工作参数,选取刮板和输送带的材料以及刮板组件和输送带的位置关系;分析起膜铲铲起残膜过程和残膜沿起膜铲上升的高度,分析夹持输送残膜时残膜受力,确定输送残膜所需夹持力的最小值为4.58 N。田间试验表明:起膜铲可以将地表残膜铲起,铲起的残膜在刮板的作用下可以顺利喂入夹持输送机构,残膜在输送过程中可以被稳定夹持,气力脱膜机构可以将夹持输送的残膜顺利脱下,防止残膜粘附缠绕,当机具作业速度为5~5.5 km/h时,残膜平均回收率达到92.5%,平均脱膜率达到97.8%。该研究可为研制残膜回收机提供参考。

       

      Abstract: Abstract: The machines currently used to recycle residual plastic film operate by picking up the plastic film using an arc-shaped spring-finger and removing the plastic film with a rotary roller. This method is problematic because it has a lower recycling rate. The film is also easily to wind around the operating parts of the mechanism which would lead the film to be difficult to remove. According to the characteristics of film, a clamping and conveying device for removing agricultural residual plastic film pneumatically has been designed. The device is mainly composed of a film-pickup mechanism, a clamping-conveying mechanism and a film pneumatic removal mechanism. The structure, dimensions and the operating parameters of these mechanisms were determined through discussion and analysis. The materials of the scraper and the conveying belt were determined. The position of the scraper component relative to the conveying belts was also obtained by calculation. The process of picking up the film and raising it with a shovel was analyzed. The pressure force acting on the clamped film (applied by one of the scrapers) was theoretically analyzed and tested. In order to convey the agricultural residual plastic film (ARPF), it was found that the minimum clamping force was 4.58 N. Field experiments showed that the film could be scooped up from the ground with shovels and successfully fed into the clamping-conveying mechanism. The film could be clamped stably throughout the film conveying process and removed smoothly by the pneumatic removal mechanism, which prevented the film from adhering to, or winding around, the parts of the mechanism. When the operating speed of prototype was 5-5.5 km/h, the results of the field experiment indicated that the average recycling rate of the ARPF was 92.5% and the average removal rate of the ARPF reached 97.8%. The results of this research may provide references for the development of new machines to recycle residual plastic film.

       

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