螺旋输送装置输送玉米秸秆功耗研究

Power Consumption and Experimental Study of Maize Straw Screw Conveyor

为了降低螺旋输送装置的输送功耗，提高输送效率，通过理论分析和试验研究，建立了不同输送条件下螺旋输送粗饲料功耗的数学模型，试验研究了螺旋转速及喂入量对输送装置的输送功耗和比能产量的影响。试验结果表明：转速每增加10r／min（喂入量为定值），输送装置的输送功耗增大5～9W，喂入量每增加0．1kg／s （转速为定值），输送功耗增大10～12 W；同时得知：输送含水率约24％的揉碎玉米秸秆（揉碎玉米秸秆的应用场合所要求的含水率范围为23％～75％）的最佳转速为120r／min，最佳喂入量为0．88kg／s，此时的比能产量为最高0．704～0．714kg／W。在此基础上，研究被输送物料的力学特性随含水率的变化情况及对输送功耗的影响。研究结果表明：物料的含水率每增加10％，其滑动摩擦角增大3°～5°，内摩擦角随含水率的增大呈先增大再减小的变化趋势，在一定的喂入量和转速下输送时输送功耗增大7～9W。

In order to reduce the power consumption of the screw conveyor and increase its conveying efficiency , the the-oretical analyzing method and experimental research were used to establish the mathematical models of the power con -sumption which suitable for the different conveying state .The effects of screw rotational speeds and the feeding rates on power consumption and productivity ratio were studied by experimental study .The results show that the conveying power consumption increases 5~9 W when the rotational speed increased 10 r/min （ filling rate is fixed value ） , and the conve-ying power consumption increases 10~12W when the filling rate increased 0.1kg/s（rotational speed is fixed value）.The experimental results still prove that the screw conveyor has the highest productivity ratio ：0 .704~0 .714 kg/W when the moisture content of material is 24%, the rotational speed and filling rate are 120r/min and 0.88kg/s respectively.At the same time , the mechanical properties of materials to be delivered with the change of moisture content and the effects of moisture content on the power consumption were studied .The results show that the sliding friction angle increases 3 °~5 ° when the moisture content of material is increased 10%.And the internal friction angle increase first and then decreased along with the increasing of moisture content ,and the power consumption of the screw conveyor increased 7~9 W under certain filling rate and rotational speed .