【正文】
soil sinks down via the grids, and the lighter peanut moves up, so that peanut is separated from soil well. The peanut is moving rearward continuously, finally even laying on the excavated ground, so it is convenient for manual collection. 3: Function characteristics of the harvester The swingdigging principle and the inverse parallelogram mechanism have been successfully created and applied to 4H2 type peanut harvester. It had broken the traditional way which is scoop and separate chain to bine together for harvesting. (1) 4H2 type peanut harvester should be matched with the small fourwheel tractors which are very universal. Its design is reasonable, with reliable working, steady function, convenient adjustment, higher adaptability, and this machine can work in various fields and harvest all kinds of peanut. (2) In harvesting process, plastic film was not broken and easy collected with the peanut stalks. There is none leavings of them on the ground. (3) As created the swingdigging principle, the whole resistance and the power consumption of the harvester have been reduced. By means of the swing function, the soil with heavy specific gravity sinking passes through the grids, and the peanut with lighter specific gravity moves up, so that the loss rate of peanut was reduced remarkably. 4H2 type peanut harvester is the new typical agricultural implement for the small scale farms of China and more suitable for Chinese peanut production. This harvester has the simpler structure and lower price. Its various performance indexes are superior to the Standard of technique indexes for peanut harvesting in China. It can bring more economic benefit to the customers. References [1] Duan Shufen, Hou Wenguang. The world peanut production and the trade outlook[J]. Chinese agriculture bulletin,1990,6(2):2125. [2] Tao Shouxiang. The present condition and outlook of peanut high yield in Shandong