| Currently widely used maize straw crushing returning machine mainly include hammerclaw type, type Y and straight knife. Work often take soil crushing, claw hammer, the bladewear serious, which resulted in increased power consumption, smashing quality decline. So,in Shandong province wheat industry technology system for funding, from rice and wheatcombine saw disc straw cutter principle of work, saw disc maize straw crushing returningmachine is developed.Through investigating and analyzing the existing main technical parameters of returningmaize straw crushing machine, determined the saw disc of returning maize straw crushingmachine design. The machine is mainly composed of stem cutting hob, pickup, saw drivingsaw plate, driven plate, power transmission system, chassis, etc. At work, first by the hobcutting the corn stalks from the root, corn stalks by the pickup sawing feeding plate knife.Master and slave saw disc knife reverse rotation, will feed the straw homogeneous scatters tothe surface after shearing, crushing, a crushing3rows of corn. Because straw chopped off theground, saw has played a supporting role, so the saw disc wear lighter, machine powerconsumption is also reduced.Analysis in rice and wheat combine chopped straw counters-field device structure andworking parameters on the basis of the saw disc knife design plan is worked out. Sawing platecutter for straight blade plate type, active sawing sawing plate and the driven plate. Drivingsaw plate of a total of28, driven disc knife56piece, through bolts and interval of casing,respectively fixed on the main, from the knife shaft. Driving saw plate spaced50mm, drivensawing sawing plate and active staggered, to ensure the uniformity of straw cutting section. Asaw disc cutter, the structure is simple, easy to change. Chop saw plate capture ability andcapability is strong, stable work, overcame the claw hammer, sling blade huge impact, loadfluctuation and high power consumption shortcomings, and heavy cutting, cutting rate is low,chopped length is uniform, the straw has good adaptability to different water content.In order to avoid the zone in front of the saw disc designed spring-tooth pickup, mainlyby the play, rail and tooth roller, etc. In order to optimize the pickup of the structureparameters and motion parameters, using virtual prototype design method, and use Pro/Mechanica module, the spring tooth fatigue analysis and motion simulation, get the gearspeed, acceleration and orbital stress change curve, analyzes the relationship between theparameters and its influence, improve the design precision and efficiency. Pick up at workwith the surface of the float, ensure without soil, don’t pick up leakage, improve the quality ofthe straw returned.Calculation and simulation analysis, draw the prototype pattern, and in Shandongprovince Taian works machinery co. the prototype test, test station in Shandong agriculturaluniversity field experiment was carried out on the prototype. The results show that theprototype major performance index has reached the design requirements. For pickup springtooth, ways of production and overall poor assembly quality, test problems often fail in thedesign of the fixed gear for pickup roller type, and combine the characteristics of the existingcounters-field set straw crushing mechanism, complete the improving design of a prototype. |
