钵体苗活动苗盘的结构设计

Design of movable tray for bowl seedlings

为解决钵苗基质与钵盘间因接触面积大而导致其黏附力大、取苗时钵苗基质破损率高的问题,将现有油菜钵体苗育苗盘设计成由齿形侧板、矩形侧板、扭力弹簧和支撑轴等组成的钵穴形状可变的活动苗盘。借助Admas软件模拟仿真活动苗盘的开启过程及侧板上的受力情况,得到开启矩形侧板、齿形侧板的作用力峰值分别为4.28和9.22 N,作用力峰值出现时的位移间隔为25 mm。在万能材料力学试验机上对活动苗盘开启过程及侧板上的受力进行检测,得到开启矩形侧板、齿形侧板的作用力峰值分别为4.72和9.96 N,其作用力峰值出现时的位移间隔为24.3 mm,位移误差为2.8%。结果表明,活动苗盘的开启过程中作用力峰值变化趋势一致,所设计的活动苗盘开启过程各侧板开启位置及开启时间与设计目标一致,能实现有序打开。

In order to solve the substrate breakage problem caused by the strong adhesive force due to the large contact area between bowl seedling substrate bowl tray,which have an effect on bowl seedlings quality,the existing tray for rape bowl seedlings was designed as a operable bowl holes movable tray,which was composed of a toothed side plate,a rectangular side plate,a torsion spring and a supporting shaft.The movable tray opening process and side plat force condition were simulated by Adams software.The peak force of rectangular side plate and toothed side plate was4.28N and9.22N respectively,and the displacement interval of the peak force was25mm.Finally,the tray opening process force test was carried on the universal material mechanics experiment machine.The results showed that the peak force of rectangular side plate and toothed side plate was4.72N and9.96N,respectively,and the displacement interval of the peak force was24.3mm and the displacement error was2.8%.It is found that there is a same variation trend of peak force with the synchronized opening process for simulation and experiment.The movable tray opening process is consistent with the design goal and the side plates can be opened in order.