الفهرس | Only 14 pages are availabe for public view |
Abstract The aim of this study is to develop a feeding system to improve the performance of threshing machines, in addition to reduce threshing cost and avoid the labor injuries used with this type of machinery. Therefore the main objectives of this study are as follows: 1- Developing a feed system to be used with threshing machine, both of them work as one unit. 2- Evaluating the threshing machine without the designed feeding system at machine drum speed 700, 800, 900 and 1000 rpm for 17.2, 15.2 and 13.4 % moisture content of wheat crop. 3- Testing the threshing machine with the designed feeding system for the aforementioned speeds and moisture contents at 17.5, 20, 23 and 26o conveyor belt angle. The experimental results showed that the performance of threshing machine with modified feeding system is better than without it. The maximum value of the feeding rate with feeding system was 2.28 ton / h compared to 1.68 ton/h, threshing efficiency of 99.50 %, cleaning efficiency of 99.70 %, un-threshed grain losses 0.50 %, grain losses in straw of 0.30 %, grain damage of 0.65 %, cutting length of straw of 1.20 cm, total grain losses of 5.37 kg / ton, operation cost of 24.04 LE / ton, threshing cost of 37.67 LE / ton after the addition of the costs of lost grains at drum speed of 1000 rpm, moisture content of 13.4 %, and conveyor belt angle of 20 degree. But, machine without modified feeding system had threshing efficiency of 98.20 %, cleaning efficiency of 98.40 %, un-threshed grain losses 1.80 %, grain losses in straw of 1 %, grain damage of 2.10 %, cutting length of straw of 1.8 cm, total grain losses of 18.13 kg/ton, operation cost of 34.98LE/ton, threshing cost of 80.85 LE/ton after the addition of the costs of lost grains at drum speed of 1000 rpm and moisture content of 13.4 %. The specific energies were 11.3 and 8.1 kW.h/ton before and after modification at both 1000 rpm and 13.4 %. The modification to the local threshing machine has contributed reduce the risks to the labors used with this type of machinery of his efficiency in the process of feeding a way that leads to increased productivity and improving the performance of a machine It is advisable manufactures this device conveyor belt and installed bales threshing existing local. |