关键词: 打瓜, 机械式, 精量排种器, TRIZ理论, 夹持取种

Abstract: The existing melon seeding metering devicesaremostlyairsuction typeswithrelatively complicated structures and highpower consumption. The working reliability and the precision of seeding need to be further improved. In order to solve the problems of complicated structure and lower seeding precision in the existing mechanized seeding of melons, a mechanical precision metering device for melons was designed using TRIZ theory. Based on the TRIZ theory, the main technical contradiction of the seeding and metering device wasdetermined, and the corresponding invention principle in the contradiction matrix wasused to design a mechanical type with a relatively simple structure, high seeding reliability, and low power consumption. Solidworkswasused to establish a threedimensional model of the seed metering device and perform finite element analysis on key components. Finally, combined with the bench test, the rotation speed of the seed metering device and the structure parameters of the seed block wereselected for performance test verification. The research showed that the simulation analysis results meet the design requirements. When the rotation speed of the seed meter was 43 r/min, and when the effective clamping length and width of the seed block were 9 mm and 7.8 mm, respectively, the qualified index and replay index of the seed meter and the missed seeding index were 83.87%, 9.23%, 6.90% respectively. The seeding performance hadbeen greatly improved compared with before optimization, which met the requirements of precise seeding. It wasfurther proved that the scheme of the melon seeding and metering device designed based on TRIZ theory wasfeasible. It can provide a reference for the followup development and research of the mechanical melon seeding and metering device.

Key words:  melon, mechanical, precision metering device, TRIZ theory, clamping seeds