【正文】
sting parts, long pitman, rockerarm, mounting device and frame etc. The figure 2 shows its structure. wheel coupling shaft rockerarm pitman device axis part part Diagram of peanut harvester The driving power needed of the work parts of 4H2 type peanut harvester es from the PTO of tractor. When the machine with tractor goes forward, the PTO drives eccentric wheel 11 pass through joint coupling 2 and transmission shaft 3. Then eccentric wheel 11 drives long rockerarm 5 to move pass through pitman 12. As erect axis 4 and harvest parts 13 are made together, rocker 8 with long pitman 6 and long rockerarm 5 constitute an inverse parallelogram mechanism, therefore harvest parts 10 and 13 swing with erect axis 4 and 9 with the same frequency and angle but contrary direction. The working process is: the scoops 10 and 13 digging the peanut out and moving the peanut backward, while the lengthways grids continuously make the fanlike swing, and then break the admixture of soil and peanuts. By this movement the heavy 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