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由于光电编码器分辨率的限制,造成基于光电编码器的秒流量液压AGC(Automatic Gauge Control)系统在板厚控制过程中的板厚控制精度达不到要求的问题,采用插入高频脉冲的方式,来提高光电编码器的测速精度,计算结果显示插入高频脉冲后光电编码器的测速误差由原来的1.6%下降到0.04%。为实现高频脉冲的插入设计了一款基于FPGA的秒流量计,并将其应用于秒流量液压AGC系统中,经过实际数据统计,秒流量计和测厚仪测量出的轧机出口侧板厚之间的误差小于0.1%,由此证明秒流量计的板厚测量精度可以满足板厚控制系统的要求。将基于秒流量计的秒流量液压AGC系统应用于冷轧现场显示,该系统控制板厚误差在±5μm以内,且系统具有很好的稳定性、鲁棒性和实用性。
Due to the limitation of the resolution of the photoelectric encoder, the accuracy of the thickness control of the AGC (Automatic Gauge Control) system based on the photoelectric encoder during the thickness control can not meet the requirements. The method of inserting the high frequency pulse , To improve the optical encoder speed accuracy, the results show that after the insertion of high-frequency pulse photoelectric encoder speed error decreased from 1.6% to 0.04%. In order to realize the insertion of high-frequency pulse, an FPGA-based second flowmeter is designed and applied to the second-flow hydraulic AGC system. After the actual data statistics, the second flowmeter and thickness gauge measure the thickness The error between less than 0.1%, which shows that the second flow meter thickness measurement accuracy to meet the requirements of the thickness control system. The second-flow hydraulic AGC system based on second flowmeter is applied to the cold rolling field display. The system control board thickness error is within ± 5μm, and the system has good stability, robustness and practicability.