1 / 2019-10-16 14:16:04

Design of Vacuum Pump Control System for Negative Pressure Shale Shaker Based on PLC

Negative pressure vibrating screen; Vacuum degree; Moisture content; PLC；Fuzzy PID control

In order to improve the solid-liquid separation effect of drilling fluid in drilling operation, a new type of negative pressure vibrating screen was developed. The vacuum pump is its main component. At present, the degree of vacuum has a significant impact on the screening effect and working efficiency of the negative pressure vibrating screen. The value of the vacuum is based on experience, the setting parameters are not adjustable, or changing via the manual adjustment, and the control precision and the degree of intelligence are low. The system of the negative pressure vibrating screen vacuum pump control was designed with the moisture content of the filter cake as the controlled variable. The mathematical model between the moisture content and the vacuum degree of the filter cake was established. The fuzzy PID was studied by using Siemens S7-300 PLC as the controller. Control the law, build a control system based on the inverter as the actuator, and control the vacuum degree according to the drilling fluid quality in real time. The field application shows that the steady state error of the system is 11.1%, which meets the drilling operation requirements.