Design On Multi-function Smashed Straw Machine For Corn

The protection cultivation is the most important international agricultural technology development tendency. The smashed straw technology is one essential technology of the mechanized protection cultivation. Using smashed straw machines can effectively solve the problems that striving for time and labour during the busying farming time, and can make the agricultural entire mechanization come to truth. It also can avoid environment pollution caused by straw setting on fire. According to multi-function and reducing production cost, multi-function smashed straw machine was developed. It not only can smash straw together with the stubble and put it back to the farmland to increase the nutrient once time but also can according to our practical necessity to choose rotary tilling single function.(1) On the basic of studying the elementary theory of smashing straw, the integral structure design plan of multi-function machine was introduced.The machine is mainly composed of hanging system, gearbox, belt transmission system, stalk-soil returning roller, rotary tiller roller, and depth limit roller. Power is transmitted from the tractor power output shaft to the gearbox. One shaft of the gearbox is accelerated by both bevel gears and strap transmission. And then it drives the stalk-smashing knives revolving quickly. Another shaft is moved by the bevel gears and strap wheel to drive the rotary tiller working.(2) The innovative point is the design of new gearbox, which has realized the composite work or single work of smashing straw, stubble and rotary tillage for the first time. It makes one machine has two uses.The gearbox is mainly composed of bevel gears, poking fork, clutch, and bearings. Using the separation or union between the clutch and gears, the separation or union of the power can be realized. So, the machine can choose smashed straw work or rotary tillage work. And the intension of bevel gears, belts, axes are checked. (3) The experiment of the machine is carried on the field. The results of the experiment can satisfy the agronomy request.The test result indicates that, the machine has good qualities to smash the straw and stubble. The average length of the smashed straw is 5.2 cm. The smashing qualified rate is 98%. The stubble smashed rate is 90%. The smashed straw is thrown equably. The fraction of coverage is high. The work performance is stable. When the machine chooses the single rotary tillage work, the rotary tillage depth can arrive at 16 cm. The crumble rate is 85.7%. After rotary tillage work, the farmland is smooth. It can satisfy the agronomy request and can carry on the following sowing seeds work directly.