Authors

Abstract

In order to explore the relationship between displacement-pulling force and the change of clamping force during the clamping and pulling process of cotton stalks in the field by different types of clamps, a test bench for cotton stalks clamping and pulling was designed. Based on the combination of virtual instrument technology and external hardware, the device is programmed by Gx Works2 and LabVIEW programming software to complete the operation of the test bench clamping and pulling device and the measurement and acquisition of information. From the mapping of the collected information, the average value of the maximum uplift force on the cotton stalks was 500 N, corresponding to an upward movement of 12 mm at the root of the cotton stalks. Through the collected information the effect of two types of clamps on cotton stalks clamping and pulling was analyzed, rigid splints with the clamping force of 750 N and a linear speed of 0.18m/s having the best effect on the cotton stalks clamping and pulling. Rubber splints have the best effect on cotton stalks clamping and pulling when the clamping force is 500 N and the linear speed is 0.36 m/s. Among them, the striped rubber splint has the best effect. The collected information was subjected to analysis of variance (ANOVA), and the results showed that the coefficient of friction of the clamping plate showed a high influence on both the pull-up force and the reduction of clamping force. Based on the obtained results, it can provide a reference for the design of clamping type cotton stalk harvesting machinery.

Abstract in Chinese

为探讨不同类型夹板对田间棉秆夹持起拔过程中位移-起拔力之间的关系及夹持力变化情况，设计了一种棉秆对夹拉拔试验台。该装置基于虚拟仪器技术与外部硬件相结合，通过Gx Works2及LabVIEW编程软件进行编程，完成试验台夹持、起拔装置的运行及信息的测量采集。由所采集信息绘图，棉秆所受最大起拔力均值为500N，对应棉秆根部上移12mm。根据所采集信息分析两种夹板对棉秆夹持起拔效果，刚性夹板在夹持力750N线速度0.18m/s时对棉秆夹持起拔效果最优，橡胶夹板在夹持力500N线速度0.36m/s时对棉秆夹持起拔效果最好，在相同的因素下，条纹橡胶夹板相对于其余两种纹路橡胶夹板效果较优。将所采集信息进行方差分析，线速度、夹持力、夹板摩擦系数作为为影响因素，起拔力和夹持力减少量为试验指标进行三因素一般因子试验。结果表明，夹板摩擦系数对两个试验指标均呈现出高度影响。根据所得结果，可为夹持类棉秆收获机械设计提供参考，有利于减少动力消耗。