连续平压机入口角度动态控制方法

基于钢材弯曲变形的特点,提出一种矩形截面的入口上热压板弯曲变形来调节入口角度的方法。在分析上热压板弯曲变形原理并推导曲率半径与拉弧高度几何关系的基础上,仿真计算上热压板弯曲强度,构建基于现场总线的分布式系统和人机交互控制系统,设计油缸位移梯度渐进算法并在国产连续平压机上实现控制。研究结果表明:入口上热压板弯曲变形满足弯曲强度要求,入口角度调节方法及控制算法能够实现油缸位移梯度变化的渐进性和入口角度调节的动态性;当入口曲率半径R为100 000 mm时,入口上热压板拉弧高度理论值与实际值最大偏差为0.4 mm,横向实际值最大偏差为0.6 mm,达到控制精度要求。

Dynamic Control Method of Infeed Angle for Continuous Flat Press

Adjustability of infeed angle is of great importance to design and use of the whole continuous flat press which is used to produce wood-based panels. Based on the capability of bending deformation of the steel, a method using bending deformation of integral infeed upper hot platen shaped as rectangular in cross section to adjust infeed angle was put forward. On the basis of analyzing curving principle of bending deformation and deducing geometrical relationship between radius of curvature and height of curving, bending strength of infeed upper hot platen was calculated by simulation and a distributed system as well as human-computer interaction control system based on fieldbus was established. Displacement gradient progressive-approximation algorithm used for hydraulic cylinders was set up and the system was applied to continuous flat press designed in China. The results showed that bending deformation of upper hot platen met requirements of bending strength, the method of adjusting infeed angle and the control algorithm could be used to achieve progressivity of displacement changing for hydraulic cylinders and dynamic adjusting of infeed angle, and the control precision could be reached by field debugging. The maximum error was 0.4mm between theoretical and practical value, and maximum horizontal difference was 0.6mm when radius of curvature was 100000mm.