| According to the distribution of the terrain, most of the areas with the mountains and hills in the southern of China, cotton cultivation is not concentrated and majority with small plots in the South of China, and the recycling use of cotton stalks give priority to with manual production, not only working hours is long, production efficiency is low, and the serious influence to change garments according to the crop cultivation. The tying device of cotton baling recycling use, not only large volume, high cost and power consumption, and is not suitable for the southern mountain small field and single-family after operations. So design a cotton baling device adapt to the south small field baling operations, small in size, flexible operation and low cost is of great significance. In order to adapt to the southern cotton baling and get top bundle harvest rate and bale density, this Paper designed the cotton baling device with the pull rod machine, researched the main physical characteristics of cotton, tying device, baling device of key Parts of structure design optimization, tying device mechanism of kinematics and dynamics analysis and baling function experiment to carry on the single factor and multiple factors related. The main content of study and the Conclusions are as follows:1)Cotton physics research. Mainly includes the cotton diameter density, moisture content, shear strength, compression density. Through to liu yang in hu nan agricultural university experiment base ’JX013’Analysis and experimental study on the physical properties of cotton, cotton diameter distribution in the rage of 12.5-14.5 mm; Pull rod when the moisture content of cotton is about 56.58%; Shear strength of cotton is about 1.28 MPa; Cotton compressed density is about 100.98 kg./m3.2)Design and parameters of tying device structure. Tying device key components for the reasonable design, the way of feeding, feed using the rake teeth tine can hook cotton and sent to the discharge port, and preliminarily determine its rotating speed is 80～120 r/min; Drawing method for double drum for cotton traction compression, and the minimum distance of 13.5 mm, double drum outside for rubber, mainly increase the friction force between the cotton and the cotton compressed by pulling smoothly into the cutting mechanism; Cutting mechanism adopts circular saw blade to cut off the cotton, the cutting effect is obvious, preliminarily determine the saw blade cutting speed is900-1100r/min; Compression mechanism for crank slide block mechanism, such as the length of the crank slide block design parameters were determined, and the get the traction roll crank slide block with the length of 300 mm,920 mm, effective stroke is 620mm.3)The mechanical analysis and optimization of the key components. The finite element analysis software (Solidworks) carries on the analysis and optimization cotton baling device of key components of the stress, deformation and displacement and so on carries on the analysis and optimization, improved scheme and size at the same time to ensure the cotton baling of rationality according to the results of optimization analysis. Through the finite element static analysis, it is concluded that the optimal sizes of tying device key components, and maintain the stability of tying device size parameters, the optimized mechanism can further rise to increase the rate of baling device bundles, and the function of bale density.4)Main dynamics and kinematics analysis. Mainly includes the tine drum kinematics analysis, roller traction force analysis, cutting force analysis, cotton slider-crank mechanism kinematics analysis, dynamics analysis and compression forces work slider-crank analysis research. Through analysis and research, under the condition of constant rake tooth roller radius, cotton tine roller speed increases as the acceleration increases, cotton, is very easy to feeding traction drum; When cotton diameter size is equal, the pressure angle decrease with the Increases of traction drum diameter, more easy to grip the cotton, feeding performance is good, the more cotton into the cutting mechanism, and the pressure angle increase with the decrease of the roller diameter, feed performance is bad, when the pressure Angle is equal to the friction angle traction drum diameter is minimum; Ft, the greater the saw blade tangential force to participate in the more N number of sawing, cotton cutting effect, the more obvious, the more cotton into the compression chamber. The crank slide block compression force, acceleration, velocity and the greater the effective stroke, them tightly on the cotton was, get bundles rate and the higher the bale density; Compression force power compressed bales tight, the more the bale density is larger, the higher the rate of cotton is not easy to scatter and bundles.5) Baling test. Main parameters for evaluating the performance of binding device is bundled rate and Bale density,and the key factors affect the device’s cotton stalk bales rate and bale density are tine drum rotating speed, drawing roller speed, cutting blade speed, slide block compression frequency. For the optimal Parameter combination affecting the rate of baling device bundles and bales density,we carried on the single factor and multi-factor regression orthogonal rotary experimental study of impact factor. The results showed that the tine roller speed, compression frequency and blade speed impact is very significant, drawing roller speed impact on bale density significantly; Tine roller speed 112.77 r/min, drawing roller speed 138.39 r/min, saw blade speed 1050.04 r/min, compressed frequency 66.79 times.min’1, The bundles rate 98.25%, bale density 107.58 kg/m3, baling effect is good. |
