水稻穴盘秧苗钵体力学特性试验研究

本文以培杂泰丰杂交稻种为试验对象，在立体育秧温室培育穴盘秧苗。试验时苗龄28天，钵体含水率为35.76～54.08%，仪器为TA-XT2i型质地分析仪。对穴盘苗钵体进行平板压缩、加卸载循环和蠕变试验研究，发现平板压缩变形为3.15 mm前后，抗压力随变形的变化趋势差异明显，在4 mm压缩量前后，抗压力出现峰值上升变化陡点。当加载力为1、2、3、4、5 N，秧苗钵体的平均蠕变量为0.0055、0.0055、0.0056、0.0057、0.0059 mm。试验结果表明钵抗压力与变形呈非线性变动；平板压缩过程，钵体无明显屈服破坏点；苗钵体面对外界加卸载时表现较强塑变能力。选用Burgers模型能有效表征穴盘苗钵体压缩蠕变特性。最后通过分析多种稻种穴盘苗力学特性，结果发现不同穴盘苗钵抗压力与变形关系遵循非线性曲线。本研究结果为水稻移栽机设计优化提供理论参考。

Experimental study on the potting characteristics of rice seedling in hole tray

The study of rice hole tray seedling potting body mechanical properties is important to reduce potting body damage, ensure the integrity of seedling potting, and optimize the transplanting machine actuator. In this paper, we took the Peixia Taifeng hybrid rice seed as the test object, and cultivated hole-pan seedlings in the three-dimensional seedling greenhouse. Seedling age at the time of the test was 28d, the water content of the potting body was 35.76-54.08%, and the instrument was a TA-XT2i type texture analyzer. Plate compression, loading and unloading cycles and creep tests were conducted to study the hole tray seedling potting body, and it was found that before and after the plate compression deformation of 3.15 mm, the resistance to pressure with the deformation of the trend of the change in the difference is obvious, before and after the 4 mm compression, the resistance to pressure appeared to be the peak of the rise in the change of the steep point. When the loading force is 1, 2, 3, 4, 5 N, the average creep of the seedling mantle is 0.0055, 0.0055, 0.0056, 0.0057, 0.0059 mm. The test results show that the mantle pressure and deformation is nonlinear variation; flat plate compression process, the mantle body has no obvious yielding point of destruction; seedling mantle face to the outside world when loading and unloading the performance of the strong plastic deformation ability. In addition, the Burgers model was chosen to effectively characterize the compression creep of the seedling potting body in the hole tray. Finally, by analyzing the mechanical properties of seedling pots of various rice species, it was found that the relationship between compressive force and deformation of seedling pots in different pots followed a nonlinear curve. The results of this study provide a theoretical reference for the design optimization of rice transplanter.