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分析了U型钢调质线生产工艺中手动调节的缺点，采用了PID调节的新方法．完成了硬件设计和软件系统，并进行了现场应用．
The disadvantages of manual adjustment in U-shaped steel quenched and tempered wire production process are analyzed, and a new method of PID adjustment is adopted. Completed the hardware design and software system, and conducted on-site applications.