Some experiments and calculations of rubber roller husker from ricepolisher's blog

Some experiments and calculations of rubber roller husker had been carried out in order to explore the mechanisms involved in husking rice grains using this method. A simple sliding friction rig with load cell and high-speed camera was used to observe the mechanisms that occur during husking. The husking performance of different rubbers was compared for changes in the applied normal load. It was found that grains rotate between the rubber counterfaces on initial motion before being husked. In addition, harder rubbers were found to husk a higher proportion of entrained grains at lower applied normal load. By measuring the coefficient of friction between rice and rubber samples, the shear force required to husk a given percentage of grains could be calculated and was shown to be constant regardless of rubber type. Based on the mechanism seen in the high-speed video, it was evident that there was a limiting shear stress that was the governing factor over the husked ratio.


Several machines have been recently developed to reduce mechanical damage during shelling. Use of relatively soft material, like rubber, instead of steel for the rasp bar and for the cylinder,is one of them. Reduction of kernel damage suffered by the crop other than corn has also been the prime objectives of several developments for threshing of seeds and grains. Some of these attempts are of interest to this study both because of their similarity in material and con figuration to the mechanism used for shelling of corn.

Airbag is widely used in heavy equipment dropped field with its efficient cushion performance and low cost. The calculation method used now for the process of airbag landing mainly is simulative calculation: analytical analysis and finite element simulation, but there are less systematic introduction for the mathematical model behind these methods in past papers.


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By ricepolisher
Added Jun 3



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