Special software's development of spiral chute for design and expression based on the redevelopment of solidworks
The spiral chute installed coal storehouse is an advanced equipment that can keep lump coal from being stricken into pieces. The aim can be achieved that to increases effectively the lump coal rate by to limit the coal flow to move spirally through the chute instead of free-fall motion. The purposes of the entire design are the speed of impact point is as low as possible while it runs smoothly in the whole process and ensuring that no half-way down coal until the coal supply ends. In addition no coal accumulates in the chute if there is no more coal to transport. Because the bottom of the whole chute is an undevelopable surface, and all of the parameters including width, spiral angle and tilt angle are continuously variable for the purpose of controlling speed and direction in one segment. It is so complicated that it is almost impossible to get all of the reasonable parameters in every point, or to get its view or to draw the developing drawing by traditional drawing method. For this reason, we developed a special software commissioned by HanDan Design Engineering China Do., LTD. The software can give these important parameters of parts, such as the width, spiral angle, tilt angle, acceleration, speed, and the variation of each parameter and so on according to coal situation (different coals, different humidity, different grain size), and coal storage conditions (diameter, height). In this article, we first study the movement rules of coal in chute, create a mechanical model and introduce of coal flow in the chute in the run-time kinematic equation. Secondly according to the requirement to make sure the coal flow moves through the chute at a constant speed we calculate the parameters of the standard segment; thirdly we could have the parameters of the non-standard segment based on the speed and the state of the coal. So a series of the boundary equations for not only the standard and non-standard but also the interior and exterior panels of the spiral chute are derived. Finally 3D solid models, views and developing drawings based on redevelopment of Solidworks are come into being. All above are not only automatic, precise and parameterized, moreover, involves more technological information. So it has an important significance on its design, expression and processing.