Design And Experiment Of Key Device Of Single Pass Silage Round Wrapping Machine

Based on the research of domestic and overseas research,this paper aims at the problems of the current silage harvesting,baling and envelop separate operation,the feeding device is easily blocked,the delivery performance is weak,low-level automatization etc.The main research content is as follow:(1)Determined the overall design scheme.To collect data and information about the single pass silage round wrapping machine,in view of the actual demand of silage corn planting pattern and harvesting work in China,through the theoretical calculation and 3D modeling,and determined the single pass silage round wrapping machine overall design scheme.(2)Design of key components of the single pass silage round wrapping machine.Header adopts s a sawtooth disk rotary structure,design the comb plate in order to avoid the straw winding on the conveyor roller and dial tooth to affect the normal work of the header,crush feeding device is a 4 roll mechanism,in the process of forced feeding straw clamping pressure,ensure the quality of cutting;The cutting and throwing mechanism is the rotary knife type,throw vane axial symmetry distribution on the cutter disc,and the moving knife radial equal angle distribution on the cutter disc and located in the middle of the two throwing blades.Design reverse grinding system,the grinding wheel is controlled by the oil cylinder,realized the online automatic sharpener.Baling device for hydraulic and mechanical transmission,benefit for the automatic control of the baling,baling chamber adopts closed loop coil rod bundle chain baling system,realized the round bale density is adjustable,using net twine net twine synchronous winding technology,improve the quality of round bale into a bundle;The electric control system of the wrapping device uses the pressure sensor to cooperate with the baling device to realize the automatic wrapping after baling.The drive chassis of the machine is the static hydraulic drive system,which is convenient for the stepless speed change and automatic control in a certain range.The vehicle monitoring system is easy to observe the operation state of the machine in real time.(3)Simulation and optimization of cutting and throwing device.Using CFD for different parameters(the number of thrown vane,speed)combined to carry out the numerical simulation,get the thrown device characteristics of internal gas-solid flow field model,and on this basis to optimize the number of the throw vane,speed,determine the best speed is 1300 r/min and throw vane number is 12.(4)Prototype development and performance experiments.Trial manufacture of a prototype and performance experiments in Shandong Yineng heavy industry Co.,Ltd.The results show that the relative cumulative mass distribution of the broken straw is in a logarithmic normal relation,theoretical length of cut is 95%,and the main indexes are in accordance with the requirements of the silage and the prototype trial requirement.