一种特殊的螺旋输送机中间支承结构的设计

THE DESIGN OF A SPECIAL HELICAL TRANSPORTER HAVING MIDDLE SUPPORTING STRUCTURE

在一种特殊的快速螺旋输送机中采用了中间支承结构。在工作过程中，螺旋旋转产生的惯性离心力引起中间支承的动反力。与慢速螺旋相比，这种动反力要大得多，它不仅减小支承的承载能力，还将造成支承的弯曲，因此，在设计支承结构时，必须充分考虑。计算时，首先综合考虑预紧力、螺旋重力、惯性离心力引起的动反力及螺纹力矩的影响，建立强度条件方程，确定支承结构尺寸。随后，检验变形。另外，支承的预紧与防松也是相当重要的。

The middle supporting structure was utilized in a special fast helical transporter,and during operating,inertial centrifugal force caused by rotary helix leads to antipower of middle supporting.Then this antipower of fast helix is by far bigger than that of slow helix,at the same time,it not only reduces the bearing capacity of supporting,but also causes the bent of supporting,therefore,it must be considered deeply in designing supporting structure.When calculating,first of all,we must consider comprehensively the motive antiforce caused by estimated tight force,helical gravity and inertial centrifugal force and the influence of screw moment,and set up the equation of strength condition,and determine thesize of supporting structure,afterwards,test the out of shape.Additional,the estimated tightness of supporting and taking precaution against slacking are also very important.