In the production, the concentration of the bottom stream of the thickener fluctuates greatly, and it is difficult for the artificial control to be accurately controlled, which directly affects the beneficiation process index. The automatic control system of the bottom flow ore concentration of the concentrator is used to realize the automatic detection of the concentration of the slurry in the bottom of the concentrator. Through the automatic adjustment of the flow rate of the underflow discharge, the automatic control of the underflow slurry in a given range is achieved, and the stable production process is achieved. Improve the purpose of production efficiency.
First, the control program
According to the requirements of the system control index, a manual manual adjustment method is adopted to install a concentration meter and an electric regulating valve on the pipeline of the sand pump outlet, and the opening degree of the electric regulating valve is automatically adjusted through the detection of the underflow slurry concentration. In order to change the underflow discharge flow, the slurry concentration is stabilized in a given range.
Second, the system configuration and control principle
The system configuration consists of concentration detection, discharge flow regulation and actuators. The system configuration is shown in Figure 5 -5-3.
The underflow concentration detection was performed by an FD-3 type gamma ray concentration meter installed on the outlet pipe of the sand pump.
The discharge adjustment is carried out by a ZSX-BS type 152.4 mm (6 inch) hose valve, servo amplifier, AC servo motor and position transmitter 044-510 suitable stroke electric actuator mounted on the outlet pipe of the sand pump. In addition to adjusting the degree of valve switching, the DFD-09 electric operator is also used to realize the conversion between manual and automatic operation.
The system control principle is as follows: Firstly, the concentration value of the underflow slurry is measured by a concentration meter, and a current signal reflecting the magnitude of the concentration value is output. This signal is indicated by the ammeter on the one hand, and input to the computer for processing by A/D conversion on the other hand. The measured concentration value is compared with the given concentration value in the computer, and if the concentration value is greater than the given range, the adjustment signal output by the computer after D/A conversion is correspondingly increased, and the valve opening adjustment is performed; otherwise, the adjustment signal is correspondingly Reduce and adjust the valve. The degree of opening (closing) valve depends on the amount of increase (decrease) of the adjustment signal. When the concentration value is within the given range, the adjustment signal does not change, so that the valve position is not adjusted and maintains the original state. This achieves automatic adjustment of the hose valve.
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DARU Technology (Suzhou) Co., Ltd. , https://www.szforcecontrolsystem.com