玻璃钢抽油杆拉挤机牵引控制系统的研制

玻璃钢抽油杆拉挤机牵引控制系统采取液压驱动 ,由线性位移传感器检测拉拔手的液压缸位置及比例伺服阀反馈的速度信号 ,这些模拟信号经放大后输入PLC中 ,根据PLC的运行程序 ,发出控制拉拔手的信号。控制系统的实际运行结果表明 :( 1)采用PLC实现了玻璃钢抽油杆拉挤机A、B拉拔手的连续交替转换 ,选择间歇拉挤的拉拔手组合灵活、可靠 ;( 2 )采用位移传感器、比例伺服阀、PLC等构成闭环控制 ,精度高 ,易于保证拉拔手运行速度一致 ;( 3)PLC通讯功能完善 ,编程器和触摸屏可通过CPU模块上的通讯口监控和设置各种参数及变量 ,其外围设备的数据通讯单元 (E— 0 2DM、E— 0 3DM)还可提供与其他PLC、IBM—PC机或智能设备的通讯 ;( 4 )所有控制参数均保留在PLC内部寄存器中 ,维修者根据需要更改参数 ,即可排除故障

Development of FRP sucker rod pultrusion machine puller control system

The original puller control system on the imported pultrusion machine for fiberglass reinforced plastic (FRP) sucker rod adopts a solidifying circuit board, therefore it is very hard to repair in case of failure. A new puller control system is developed to replace the original circuit board. Drived hydraulically, the new control system acquires analog signals, such as the position of the puller cyliner provided by a linear position transducer and the velocity signal feedback from the proportional servo valve, then inputs these signals into PLC after amplification, and finally gives the signals to control the pullers according to the result of PLC data processing. The operation of the new control system shows that, (1)alternative switch of pullers in a continuous or an intermittent mode can be realized by PLC; (2)position transducer and proportional servo valve and PLC comprise a closed loop control with high accuracy, ensuring the pullers runs at the same speed; (3)PLC provides perfect communications; (4)all the control variables are stored in the PLC internal register, and can be changed if needed in troubleshooting.