In Xinjiang,in the process of whole stalk harvesting of cotton stalks,there is a problem that the cotton stalks are easily pulled off,and there is an urgent need to develop flexible stalk-pulling machines.Through lite...In Xinjiang,in the process of whole stalk harvesting of cotton stalks,there is a problem that the cotton stalks are easily pulled off,and there is an urgent need to develop flexible stalk-pulling machines.Through literature,patent summary,and field research,it is found that domestic researchers have designed many kinds of machines for the problem of easy breaking of cotton stalks,but there is no flexible cotton stalk-pulling machine for the time being.In this study,two flexible cotton stalk-pulling machines were intended to address the problem of easy breakage of cotton stalks.On the basis of the first-generation machine,the design of the second-generation machine was improved.In order to further improve the operational performance of the flexible cotton stalks pulling tools,the operational mechanism of the core working parts of the tools was analyzed and a comparative test was done in a large field.Analysis and the comparative tests proved that improving the clamping working stroke s of the stalk-pulling components can effectively reduce the cotton stalks leakage rate.By using a flexible clamping process,a part of the deformation of cotton stalks can be transferred to the flexible material.To a certain extent,the deformation length L of the contact surface between the cotton stalk and the stalk pulling part is reduced,and the deformation displacementΔy is correspondingly lower.The toughness of the cotton stalk is not significantly decreased and the cotton stalk does not break easily.The improved second-generation machine has a 3.67% to 3.79% lower cotton stalks leakage rate and a 5.65% to 6.30% lower cotton stalks breakage rate than the first-generation machine.As the land in Xinjiang is clay soil,soil bonding to cotton stalks pulling force F2 is larger,resulting in cotton stalks being more difficult to be pulled out of the machine at once.The test proved that the improved second-generation implements had a significant improvement in the cotton stalk-pulling effect because of the subsequent pulling interval CD.The test results verify the analysis results and the research results can provide a theoretical basis for the subsequent structural improvement and performance enhancement of the flexible cotton stalk-pulling machine,which is of reference significance for solving the problem that the cotton stalks are easily pulled and broken in Xinjiang,China.展开更多
利用 UG 软件对豆浆机过滤器进行模具设计。针对豆浆机过滤器的结构进行了工艺性分析,塑件具有阶梯圆桶形状及表面存在大面积的侧凹,模具采用了典型的哈弗模成型塑件外表面,完成侧向分型抽芯。利用普通冷流道进行充填,一模两腔结构形式...利用 UG 软件对豆浆机过滤器进行模具设计。针对豆浆机过滤器的结构进行了工艺性分析,塑件具有阶梯圆桶形状及表面存在大面积的侧凹,模具采用了典型的哈弗模成型塑件外表面,完成侧向分型抽芯。利用普通冷流道进行充填,一模两腔结构形式,侧浇口进料,浇注系统设在哈费块上,与塑件相连。由于该模具的开模顶出行程较长,采用导柱导向及辅助定位机构,在成型塑件的行程上增加虎口辅助定位。其推出系统是模具设计的难点,由于塑件高度达 203 mm,如果采用常规模具设计顶出机构,只有开模行程为 700 mm 的 2 000 g 注塑机才能满足要求,该模具的顶出机构采用拉板结构,在开模的同时,可使塑件从凸模顶出,缩短了模具的开模行程,只要 XS-ZY-500 注射机满足要求,避免采用大型注射设备,就能达到节能节材的效果。展开更多
基金This work was supported by the Key R&D Project of Xinjiang Uygur Autonomous Region(Grant No.2022B02022-2)the Key R&D Project of Xinjiang Uygur Autonomous Region(Grant No.2022B02023-3)+3 种基金the Agricultural Science and Technology Promotion and Service Project of Xinjiang Uygur Autonomous Region(Grant No.NTFW-2022-17)the Tianshan Innovation Team Project of Xinjiang Uygur Autonomous Region(Grant No.2020D14037)the Natural Science Foundation of Xinjiang Uygur Autonomous Region(Grant No.2019D01A45)the National Natural Science Foundation of China(Grant No.51865058).
文摘In Xinjiang,in the process of whole stalk harvesting of cotton stalks,there is a problem that the cotton stalks are easily pulled off,and there is an urgent need to develop flexible stalk-pulling machines.Through literature,patent summary,and field research,it is found that domestic researchers have designed many kinds of machines for the problem of easy breaking of cotton stalks,but there is no flexible cotton stalk-pulling machine for the time being.In this study,two flexible cotton stalk-pulling machines were intended to address the problem of easy breakage of cotton stalks.On the basis of the first-generation machine,the design of the second-generation machine was improved.In order to further improve the operational performance of the flexible cotton stalks pulling tools,the operational mechanism of the core working parts of the tools was analyzed and a comparative test was done in a large field.Analysis and the comparative tests proved that improving the clamping working stroke s of the stalk-pulling components can effectively reduce the cotton stalks leakage rate.By using a flexible clamping process,a part of the deformation of cotton stalks can be transferred to the flexible material.To a certain extent,the deformation length L of the contact surface between the cotton stalk and the stalk pulling part is reduced,and the deformation displacementΔy is correspondingly lower.The toughness of the cotton stalk is not significantly decreased and the cotton stalk does not break easily.The improved second-generation machine has a 3.67% to 3.79% lower cotton stalks leakage rate and a 5.65% to 6.30% lower cotton stalks breakage rate than the first-generation machine.As the land in Xinjiang is clay soil,soil bonding to cotton stalks pulling force F2 is larger,resulting in cotton stalks being more difficult to be pulled out of the machine at once.The test proved that the improved second-generation implements had a significant improvement in the cotton stalk-pulling effect because of the subsequent pulling interval CD.The test results verify the analysis results and the research results can provide a theoretical basis for the subsequent structural improvement and performance enhancement of the flexible cotton stalk-pulling machine,which is of reference significance for solving the problem that the cotton stalks are easily pulled and broken in Xinjiang,China.
文摘利用 UG 软件对豆浆机过滤器进行模具设计。针对豆浆机过滤器的结构进行了工艺性分析,塑件具有阶梯圆桶形状及表面存在大面积的侧凹,模具采用了典型的哈弗模成型塑件外表面,完成侧向分型抽芯。利用普通冷流道进行充填,一模两腔结构形式,侧浇口进料,浇注系统设在哈费块上,与塑件相连。由于该模具的开模顶出行程较长,采用导柱导向及辅助定位机构,在成型塑件的行程上增加虎口辅助定位。其推出系统是模具设计的难点,由于塑件高度达 203 mm,如果采用常规模具设计顶出机构,只有开模行程为 700 mm 的 2 000 g 注塑机才能满足要求,该模具的顶出机构采用拉板结构,在开模的同时,可使塑件从凸模顶出,缩短了模具的开模行程,只要 XS-ZY-500 注射机满足要求,避免采用大型注射设备,就能达到节能节材的效果。
