The double drum drive is widely used on the mine belt conveyor, which are divided the rigid connected double drums and separately driving double drums according to connected method of two drums. Because of the change ...The double drum drive is widely used on the mine belt conveyor, which are divided the rigid connected double drums and separately driving double drums according to connected method of two drums. Because of the change of real work condition, the load distribution is changed on the two drive drums, which may produce a slippage between a drum and belt. Slippage may intensify the wear of the drum, and sometimes causing the fire of the belt. This restricts the development toward narrow belt, high velocity and large power of belt conveyor. In this paper, the factors affecting the load distribution of two drums of double drum belt conveyor are systematically analyzed and some computing formulas derived, by these formulas, the actual lcad distribution on the two drums of rigid connected or separately driving belt conveyor can be separately calculated.These formulas also can be as the theory base for adjusting the driving force of two drums.展开更多
This research investigates the soil conditioning effect of sugar cane fields with biochar produced from sugarcane bagasse.Its influence on the physicochemical and microbiological conditions of the soil and the agronom...This research investigates the soil conditioning effect of sugar cane fields with biochar produced from sugarcane bagasse.Its influence on the physicochemical and microbiological conditions of the soil and the agronomic performance of sugarcane seedlings was verified.To this end,the biochar from sugarcane bagasse was produced by pyrolysis in a double drum oven and mixed with soil at rates of 0,1%,3%,and 5%(in weight).The experiment was installed in a greenhouse with two evaluation periods(30 days and 60 days)and five replicates.Each pot received a pre-sprouted cane seedling,and the analysis of colony-forming units(bacteria and fungi),physicochemical characteristics of the soil,and growth and development of sugarcane were performed per pot.The biochar showed a high fixed carbon content(72%)and a specific surface area estimated by the adsorption of methylene blue of 50 m2 g−1.Furthermore,its structure is porous and contains important nutrients(e.g.,CaO,K2O,and P2O5).In the periods evaluated,the applications of the 3%and 5%(in weight)rates of biochar reduced most of the soil fertility parameters.However,the chemical analyses indicated that the sugarcane field soil collected already possessed high fertility.The microbiota was influenced,but only the application of the 3%(in weight)rate at 60 days after planting showed a significant positive effect on the number of bacteria forming units,with an increase of approximately 385%.On the other hand,no significant positive effect on sugarcane development was found.Therefore,biochar application in high-fertility sugarcane plantation soil did not result in gains for sugarcane development in the periods evaluated.展开更多
文摘The double drum drive is widely used on the mine belt conveyor, which are divided the rigid connected double drums and separately driving double drums according to connected method of two drums. Because of the change of real work condition, the load distribution is changed on the two drive drums, which may produce a slippage between a drum and belt. Slippage may intensify the wear of the drum, and sometimes causing the fire of the belt. This restricts the development toward narrow belt, high velocity and large power of belt conveyor. In this paper, the factors affecting the load distribution of two drums of double drum belt conveyor are systematically analyzed and some computing formulas derived, by these formulas, the actual lcad distribution on the two drums of rigid connected or separately driving belt conveyor can be separately calculated.These formulas also can be as the theory base for adjusting the driving force of two drums.
文摘This research investigates the soil conditioning effect of sugar cane fields with biochar produced from sugarcane bagasse.Its influence on the physicochemical and microbiological conditions of the soil and the agronomic performance of sugarcane seedlings was verified.To this end,the biochar from sugarcane bagasse was produced by pyrolysis in a double drum oven and mixed with soil at rates of 0,1%,3%,and 5%(in weight).The experiment was installed in a greenhouse with two evaluation periods(30 days and 60 days)and five replicates.Each pot received a pre-sprouted cane seedling,and the analysis of colony-forming units(bacteria and fungi),physicochemical characteristics of the soil,and growth and development of sugarcane were performed per pot.The biochar showed a high fixed carbon content(72%)and a specific surface area estimated by the adsorption of methylene blue of 50 m2 g−1.Furthermore,its structure is porous and contains important nutrients(e.g.,CaO,K2O,and P2O5).In the periods evaluated,the applications of the 3%and 5%(in weight)rates of biochar reduced most of the soil fertility parameters.However,the chemical analyses indicated that the sugarcane field soil collected already possessed high fertility.The microbiota was influenced,but only the application of the 3%(in weight)rate at 60 days after planting showed a significant positive effect on the number of bacteria forming units,with an increase of approximately 385%.On the other hand,no significant positive effect on sugarcane development was found.Therefore,biochar application in high-fertility sugarcane plantation soil did not result in gains for sugarcane development in the periods evaluated.
