| Straw bale technology is the key to the comprehensive utilization ofstraw, it can not only solve the problem of straw burned in situ, improveenergy structure, reducing environmental pollution; but also it can promotelarge-scale and industrial use of crop straw resources and provide a largenumber of raw materials for comprehensive utilization of crop strawresources rapidly. It has significant economic and social benefits. Theparty’s18has been proposed to make great efforts to promote theconstruction of ecological civilization, focusing on support for renewableenergy development, the development of the agricultural cycle, which not onlyput forward new requirements for the utilization of straw, but also providesnew opportunities.Straw baler is the key equipment for straw utilization. The researchof pick-crushing device is important part of the baler.This paper analyzesthe existing pick-crushing device and draw straw chopper machine, whichpropose to make by clockwise (positive turn) high-speed rotating blade topick and crush straw. It use the inertia and vacuum suction of high-speedrotating blade which throw the broken straw into the straw bales room.，and it can complete pickup、crushing and feed. Based on theoretical analysis,parameter design and simulation analysis of pick-crushing device,we carriedout the whole field performance experiment finally in9YG-2.0round baler.Based on studying overall structure of baler and motion analysis andworking principle of pick-crushing device, it Obtain equations of motion andtrajectory of blade, which the trajectory is cycloid. the maximum of theabsolute speed of the blade is the highest point, the minimum is the lowestpoint.The factors of influencing picking and crushing effect is the knife roller speed Machines forward speed and knife arrangement.Combined with studying the type, density and arrangement of the existingblade and analyzing its strengths and weaknesses, the paper use two L-shapedblade combination of Y-type structure.28Blade block,on which the blade isconnected by a pin,are arranged in a single spiral on the knife roller.Theblade can swing freely.References to in order to ensure quality ofpick-crushing, Knife linear velocity must be greater than48m/s.Throughstudying the parameters of knife roll of existing straw chopper machine pa，the paper determine that the width of the pick-up is2m.The knife roll，which of rotating diameter is R=100mm, inner diameter is r=90mm, minimumspeed is1868r/min.is designed to be hollow.Using CATIA to build3-D models of pick-crushing device and carring outblade license swinging angle simulation and verification. The simulationresults shows that unilateral blade maximum angle can reach112degrees.Carring out kinematics simulation and verification of pick-crushing device,the paper obtain trajectory curves and velocity curves of knife endpoint.Preliminary validation meet the requirements。The analysis of Knife roller’saerodynamics shows that the high-speed rotating blade roll can acceleratethe flow rotation and out radially. The protective cover can help to guidethe airflow to enter into a bundle of straw bale room.Through the baler performance test, the paper determine that theaverage time of bundles is143.7seconds.In the case of a trouble-free, itproduces about25bales per hour.The dimensions of bundle ф1.32×1.61m,density119.77kg/m3,Straw loss rate2.87%,which meet designrequirements.When the test shows that take2000r/min, taken forward speed3.5m/s,single helical blade arrangement, the pick-up rate of up to97.23%straw.In this paper, the research of pick-crushing device of straw balers hassome practical value and provide some reference for studying straw balerdeeply for pick-crushing of corn straw. |
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