番茄育苗播种机双腔排种滚筒的性能试验研究

针对现有气吸滚筒式排种器部件多、装配难、密封性差、无正压投种气室,以及难于实现正压投种清堵功能、直接造成排种器漏播率高的的技术问题,提出了利用3D快速成型技术打印剖分式负压吸种滚筒的新思路,并创新设计了双腔排种滚筒。以番茄种子为试验对象,以滚筒转速、滚筒负压和投种腔气室正压为试验因素,进行正交回归试验,并利用Design-Expert软件对试验数据进行方差分析和回归拟合,分析了影响排种性能指标的滚筒负压、滚筒转速和投种腔气室正压的显著性,确定了影响排种性能指标较优的结构参数、工作参数,即当投种腔气室正压为2.2k Pa、滚筒负压为2.4k Pa、滚筒转速为16r/min时,性能指标的最优值及为单粒率93.2%,重播率4.3%,漏播率2.5%,均满足精量排种的技术要求。

Experimental Study on the Performance of Double Cavity Metering Roller for Tomato Seedling Planter

In view of technical problems exiting in single cavity seed-metering roller, such as the assembly of positive pressure zone of metering is very difficult, poor sealing, no positive pressure for gas chamber,and it is hard to achieve positive pressure for unblock the function, directly causing the technical problem of high metering device leakage rate. For the reasons, this paper puts forward a new idea of using 3d rapid prototyping technology to print the roller, and innovatively designs the double cavity seed-metering roller. The tomato seed was chosen as the test object,the qualified index, the multiple index, and the missing index were chosen for sowing object. Based on the three-factor three-level orthogonal regression test method, the influences of kind of positive pressure cavity chamber, negative pressure of roller and rotate speed on sowing performance were explored. The regression equations of the 3 factors were fitted through the processing by Design-Expert (experimental design expert) software. The experimental results showed the significant influence of positive pressure of air chamber,negative pressure of roller and rotate speed. Based on the results of examination, we found that the fitting of the equations was good, the best parameter combination was kind of positive pressure cavity chamber of 2.2 kPa, negative pressure value of 2.4kPa, and speed of 16 r/min, and under the optimal condition, the qualified index was 93.2, the multiple index was 4.3, and the missing index was 2.5, the double cavity metering roller met the standard and requirements by comparing the results with the national standard and planting requirements.