针对大型钢管防腐涂层在自动涂装生产线中由于大型钢管的行进速度变化不均造成漆膜厚度不均匀、油漆损耗过大的问题,在大型钢管防腐涂层自动涂装生产线中采用了人机界面(HMI)与可编程控制器(PLC)控制系统、激光位移传感器测速装置对大型钢管行进速度实行闭环控制,控制大型钢管匀速行进.通过实际应用分析,对比测量开环、闭环速度历史曲线变化情况,同时在喷涂参数相同的情况下,研究了闭环控制前和闭环控制后大型钢管防腐涂层漆膜厚度的变化情况.研究结果表明:基于HMI与PLC的位移闭环控制系统能有效地解决由于大型钢管在行进过程中速度变化不均所造成的漆膜厚度不均匀、油漆损耗过大的问题,漆膜厚度的变化幅度由原±30％降至±10％左右,证明基于HMI与PLC的位移闭环控制系统在大型钢管防腐涂层自动涂装生产线上的应用是可行的.%Aiming at the problems of uneven film thickness of large steel pipe anti-corrosion coating and large loss of paint due to the speed change inequality of large steel pipe on the automatic coating line, the human machine interface (HMI) and programmable logic controller( PLC) control system and speed measurement equipment of laser displacement sensor were applied in large steel pipe automatic anti-corrosion coating line for closed-loop control of steel pipe moving speed to keep uniform speed of steel pipe running. The film thickness changes of large steel pipe anti-corrosion coating before and after closed-loop control were tested in the case of the same spray parameters through practical application analysis and contrastive measurement of the speed history curve of open-loop and closed-loop. The results indicate that the displacement closed-loop control system based on HMI and PLC can effectively improve the problems of uneven film thickness and large loss of paint due to the speed change inequality in the process of large steel pipe running. The film thickness change rang is reduced from ± 30% down to about ± 10%, which means that the displacement closed loop control system based on HMI and PLC in automatic anti-corrosion coating production line for large steel pipes is feasible.
展开▼
