Design And Experimental Research Of The Cotton Stalk Chopper

Now specifically aimed at returning the chopped cotton machine is less, is one of the more common universal rejection knife chop or hammer claw type straw counters-field. The representative of which is exchangeable knife chop straw counters-field set, strong commonality, chop of corn, sorghum straw has better effect, but the high lignification degree of cotton, the effect is not ideal, and the equipment volume is big, should not be used in small southern hilly area of field work. Specifically for cotton operation knife shaft and inclined fixed knife cut mode chopped counters-field, chopped effect is universal straw counters-field confidential work is good, but there is no support cutting, lodging, high stubble and requirements to do homework. In order to adapt to the southern hilly mountainous cotton cotton returning chopped operation, the author designed a small saw more returning plate of vertical shaft type cotton chopped device, the device implements the-wrong line operation and supported cutting, and cut off at the same time also with the function of except the crop of cotton. Evaluation index of the device chopped effect is the percent of pass, in addition to the crop rate and power consumption, in order to make it have ideal chopped effect, this paper mainly studies the following several aspects.1) the experimental study of physical properties of cotton. The study found that the different heights section of cotton over time showed a trend of lower moisture content; With the loss of the moisture content, the shear strength have been reduced to increase the trend, mainly because of its high moisture content, the cotton strong toughness is not easy to be cut, the low moisture content, the cotton is crisp, easy to be cut off; Cotton bending strength and negatively correlated with cotton height change tendency, namely, the higher the height of cotton, the flexural strength; Relation between cotton bending strength and the moisture content of the moisture content gradually reduced, cotton bending strength is rapidly increasing first, after a steady increase, and a rapid increase, Considering the factors, when the moisture content at 20%-20%, suitable to help stem device feeding, support, cutting operations.2) returning cotton chopped device structure design. The author based on the physical properties of cotton, combined with the characteristics of the southern hilly homework, small cotton chopped counters-field device was designed, mainly including help stem device, cutting device and crop removal equipment. Cutting device with a crop of devices to share a spindle, from top to bottom in turn have gradually smaller diameter sawing plate. Help stem device including two symmetric distribution helps stem axis, helped stem shaft are installed on the set of rows of shifter lever, each dial rod group contains three intervals of 120°of the shifter lever; Crop removal equipment including crop knife and stubble cutter disc removal, knife plate installed on the bottom of the main shaft, such as in the same plane installed between two faults in addition to knife.3) the finite element analysis and optimization of key parts. Using PRO/E 3 d software for virtual simulation device of returning cotton chopped and motion analysis, the feasibility and the rationality of the verification device design, prototype production for the follow-up to provide reliable parameters. Using the mechanic module to help stem device-key components of the stem for fatigue strength analysis, the fatigue life, fatigue damage and life confidence analysis and optimization; Except for crop knife and sawing plate stress, displacement, strain analysis and optimization. Through mechanics analysis, virtual simulation and optimization design, the returning chopped device key components is obtained the optimal size parameters and structure.4) the main mechanism of returning chop cotton plant dynamics and kinematics analysis. Mainly includes cutting saw plate dynamics analysis, the cutting process, sawing force analysis, except the crop of kinematics analysis, shifter lever dynamics analysis, the influence factors of sawing force is obtained by analysis and research, sawing sawing feeding and disk rotational speed and the relationship between teeth; A sawing plate cutting cycle of radial force, axial force and tangential force changes in the scope and trend; In addition to crop knife trajectory and the relationship between the velocity and acceleration; Dial the rod stress and the maximum bending stress under analysis.5) sample test. Returning cotton chopped device of the main evaluation index percent of pass, in addition to the crop rate and power consumption, which in order to achieve higher qualified rate, in addition to the crop rate and lower power consumption, which might affect the percent of pass, in addition to the main factors of crop rate and power consumption is sawing disk rotational speed, the machine speed and slit width direction. In order to find out the factors and the percent of pass between factors, in addition to the rate of crop, and the influence degree of the power consumption, the single factor and regression orthogonal experiment was carried out. The results showed that the factors influencing the percent of pass and in addition to the rate of crop size of machine speed, saw disk rotational speed, slit width direction; Factors of affecting power consumption was followed by sawing plate speed, machine speed, slit width direction. Use planning to solve the parameter optimization, percent of pass and in addition to the crop in the cotton length rate under the condition of no less than 85% and 85% respectively, sawing plate speed of 860 r/min, machine speed 0.65 m/s, the slit width direction is 60 mm, power consumption is 5.91 kW.