| Conservation tillage is a new farming methods of mechanization of agricultural production today, it is a reasonable tillage style to protect soil and water which required the straw coverage not less than 30%. subsoiling is one of the key technologies among four mechanized conservation tillage technologies, but also the main means to overcome the challenges that constraints today’s dryland agricultural production and development- The plough. currently has advocated under the straw cover, conservation tillage technology-based requirements subsoiling operation, there is a subsoiler hanging grass, block, etc. affects the quality of subsoiling operation,which is technical problems and restricts the promotion of subsoiling technology and subsoiling equipment, and then restricts the development of mechanized conservation tillage techniques.Installation rolling blockades parts before subsoiler is a effective method to overcome the technical problems of subsoiler hanging grass and blocking, through easily, meet conservation tillage technology and other new agronomic technical requirements, but the shape, diameter, operating depth,forward speed and other structural parameters and motion parameters of rolling blockades parts, directly affect the cut rates of straw and stubble, thereby affecting the blockades quality. Therefore, this article design the rolling disc for cutting grass blockades components, analysis and optimization of the best structural parameters and motion parameters. The main studies includes the following sections:1.Installation support of the disc parametric design and finite element analysis. At first,Use CATIA software to establish three-dimensional solid model, and import three-dimensional solid model into ANSYS Workbench software,and get static structural analysis on installation support.2. Determinate straw cut rate and working resistance. Use Box-Behnken combination design theory, in the indicators of straw cut rates, working resistance,Experimental design by Design-Expert software, designed three factors and three levels of 17 sets of orthogonal combination test, Analysis straw cut rate and working resistance in different diameters, plowing deep, plowing speed conditions.3.Using the Design- expert software to secondary multivariate regression fitting and optimization for the following two conclusions:(1) The regression equation for the straw cut rate:R1=93.28+1.56A+4.16B+0.75C-0.014AB-0.05BC-0.068B2Straw cut rates affect significant factors inincreasing order: forward speed, cutter diameter, working depth;The regression equation for working resistance:R2=1238.8+0.245A+0.36B+85.3C+5.6BC+0.041AB-0.312B2working resistance significant factors in increasing order: forward speed, cutter diameter, working depth;(2)Apply Design-Expert software to optimize the forward speed is 3.96 km / h, the best disc diameter is 400 mm, tillage depth is 85 mm, the straw cut rate is 95.13%, working resistance is 1373 N under the best parameters. In order to verify the accuracy of the optimization results, the test repeates 10 times in the field test. Test results of straw cut rate and working resistance with an average of 96.13% and 1412 N, and software optimization results are basically the same. |
