Study On Working Mechanism Of Standing Stalk Cutting System For Mechanized Harvesting Of Sugarcane

Mechanized harvesting of sugarcane is of great significance to improve production efficiency,reduce labor intensity and reduce production cost.It is an inevitable trend of developing China’s agricultural economy.At present,China’s sugarcane mechanized harvesting is at a low level.Most sugarcane harvesters in the market are not effectively suitable for China’s sugarcane industry.There are some problems in the work,such as large sugarcane damage,high impurity content and low harvesting efficiency.Therefore,the research of sugarcane mechanization equipment is still a key task.As an important mechanism to complete the first process of sugarcane harvesting,the cutting system has an important impact on the cutting quality and conveying effect of sugarcane.Most of the existing prototypes use the traditional"push-down"harvesting method,which has some problems,such as large root damage and machine blockage.Taking the cutting system as the research object,aiming at the shortcomings of the existing equipment,this thesis puts forward a standing stalk harvesting mode of"support-cutting-conveying",analyzes the working mechanism of the standing stalk type through theoretical analysis,simulation research and experimental verification,focuses on the influence law of different structures and working parameters of the cutting system on the harvesting effect,and obtains a series of optimal combination parameters through orthogonal test.The main research contents and conclusions are as follows:(1)The existing problems of traditional push-down harvesting are analyzed.According to the characteristics of high cutting quality of manual harvesting sugarcane,the overall scheme of standing stalk cutting system is established,and its working principle is expounded.In the cutting system,the chain clamping device is used to clamp and transport the sugarcane,and the root is cut by the disc cutter,so that the sugarcane can be harvested in a relatively upright state.(2)The clamping and conveying process of standing stalk cutting system is theoretically analyzed,including its working principle,conveying process,paddle kinematics and stalk deflection.The virtual prototype simulation model is established in ADMAS to simulate the sugarcane harvesting process.It is observed that the sugarcane can be transported smoothly under the action of the cutting system,and it is found that the root bushing force decreases with the increase of the height of the sugarcane stem clamping point.The orthogonal test shows that the sugarcane conveying effect is the best when the conveying speed of the paddle is 1.5m/s,the height of the holding point of the paddle is 0.85m and the vehicle speed is 0.5m/s.(3)The cutting process of sugarcane with cutting tool was studied theoretically,the cutting mode and the conditions of not missing sugarcane were determined,and the stress of cutting tool was analyzed.The strength of the load applied to the tool is checked in ANSYS/Workbench,and the maximum stress value is 106.6MPa,indicating that the tool material meets the use requirements.Through the finite element method,the dynamic analysis of the cutting process of sugarcane is carried out,and the stress in different cutting stages is observed.The cutting force curve and energy curve show the stability of the cutting process.Through the simulation test,the influence laws of different factors on the cutting force are obtained,and through the optimization analysis,the optimal combination parameters of cutting sugarcane are obtained as follows:the cutter head speed is 800r/min,the cutter head inclination angle is 9~o,and the cutter edge angle is 30~o.At this time,the cutting effect of sugarcane is the best,and the maximum cutting force is 171.33N.(4)The cutting system is verified and analyzed.Through the field sugarcane harvesting experiment with the optimal combination parameters obtained from the simulation,the average head breaking rate of sugarcane is 6.1%and the average passing rate is 99.1%,which verifies the reliability of the standing stalk cutting system.