Design and construction of a cultivator with the ability to work on plant residues

Nourani-Atashghah, Ali (2017) Design and construction of a cultivator with the ability to work on plant residues. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Fighting weeds are one of the most costly measures that is being taken to increase the production of crops and has a direct impact on the price. Current methods of controlling weeds in field includ agronomic, physical, and mechanical, biological and chemical prevention. The purpose of this study was to design and construct a cultivator with the desired performance in rows of cultivation in the presence of plant residue. Some of the conditions that should be considered specifically for the cultivator in this research were: the specific shape of the blade and its angles, safety and simplicity, proper strength of the device, ease of construction, and lower operating costs and maintenance. Design, stress analysis and strain cultivators with working on plant debris Simulation 2015 Solidwork software was used. At first, all the parts of the cultivator were simulated and then transferred to the analysis environment. In order to calculate the mechanical strength of the frame and other components of the cultivator, no plastic strain on the components of the cultivator was shown. The tension in all the selected elements was less than the tension limit, the highest tension in the set was observed in the arm assembly to the chassis of 0.42 MPa. After the design, a cultivator was constructed asa one row machine. The field evaluation of the machine was carried out in loam sandy soil and at a moisture content of 8% and more in the presence of plant remains. Experiments were carried out in RCBD at three levels of advance velocity (3.6, 4.5 and 7.2 km / h) and four replications. In each experimental plot, the amount of plant remains that remained after the operation tillage was measured. The results of analysis of variance showed that there is a significant difference between the levels of advance velocity at 1% probability level, and as a result of increasing the advance velocity, the amount of plant residues instead of residues significantly decreases. The results of the evaluation of the average amount of plant remains before and after the tillage operation and their comparison showed that the cultivator had a high conservation efficiency at a speed of 7.2 km/h. Keywords: Conservation tillage, Cultivator, Plant residual, flat duckfoot blade

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