Research And Experimental Analysis Of Centralized Pneumatic Seeding System

With the development of science and technology, in order to keep with the modem agriculture' progress the drills machinery need enhances its working speed, increases work breadth, develop combining working type processes. At present, most of seed meters belong to "one seed meter to one row" type, then researching central platoon kind of systematic is one of important questions which we must need to solve.This research topic is for the purpose of developing one kind of air-stream distributing type of metering mechanism, choice external force feed as the mechanical quota installment, which, can adjust broadcasts the quantity. In this topic we take the air current as the carrier, seeds be feeded in a radial direction, completes the extra wide many lines of sowing seeds work. Based on the performance testing, we can further optimizes the parameter, perfect the structures, except that we can provides the theory basis for the fine quantity or half fine quantity sowing seeds machine' design and application. This research creates the condition for ploughs broadcasts the combination type machinery' researching and developmentDesigning the mainly parts including a row of meter, the material supplying ejector, the distributor, the transmission system and so on is the main work of this topic; Carries on the optimized design to the divider structure, designs the divider lower part of the body ball crown shape. The mechanical quota installment has many virtues, such as the quantity adjustment scope is very big, can satisfy the need of simultaneously ten lines of sowing seeds, moreover broadcasts the quantity adjustment is conveniently, accurate and the operation is simple. Design one kind of spray nozzle spraying which may be adjust the distance to the mixture chamber.The key component of row of kind of meter of precession axis moves has been successively to taste the test mechanical and electrical institute laboratory HRP-â…¢fast shaper and the DK77120 electrical fire cuts the manufacture to complete. Finally has carried on the system assembly, the debugging and the performance experiment.The result indicated that when the spray nozzle diameter is twenty-four mm the negative pressure is biggest. Through the change divider cavity structure, the divider under cavity design for on raised circular arc shape, reduces the systematic pressure to damage, causes to broadcast quantity most to 19.4kg/ Chinese acre. When test conditions quite same not less than, the fold tube length if excessively is small, the effect is not obvious; But works same as when length oversized. Tt has the tendency that after the fold tube' length increase the each line of displacements uniform coefficient of variation appear that first reduces then increases. The best fold tube length chooses 260 mm. On condition that each line of displacements uniform coefficient of variation is the minimum value 1.8%.The innovation aspects as follow: firstly, turn the traditional "level+vertical" layout way of air blower seed divider to the "vertical" layout way, which reduced the transportation pipeline length, simplified the system structure, saved the energy; secondly, changing the divider lower part of the body base to the raised ball crown, which is convent for the air current and seed's mixture smoothly flows out and result that reduces the energy consumption.The innovation aspects as follows: Turn the traditional "level+vertical" layout way of air blower seed divider to the "vertical" layout way change the divider lower part of the body base to the raised ball crown, which is convent for the air current and seed's mixture smoothly lows out and result that reduces the energy consumption. Designed one kind of spray nozzle the ejector which may adjust to the mixture chamber distance, then can found the performance optimum condition of this system.