The measurement methods and performance requirements
Stabilized Soil Mixing Plant can use electronic measuring system of instrument, industrial computer and PLC (programmable controller) three kinds of control mode. Due to the present stage with PLC control of the analog in the actual application effect is not very ideal, so the electronic dynamic measurement of stabilized soil mixing equipment control system most adopts industrial control instrumentation and ingredients in two ways.
Two types of control system can be achieved theoretically aggregate measurement error ≤±2%, or less system powder metering error of ≤±1%. In compiling the corresponding platform application software, the use of English character operating system, only language phrases or moment can do the title.
But it has the following features:
1.It can be online for a variety of materials to the amount of set and a single flow and flow rate setting; The sum of the actual traffic material consistent with the computer shows the sum of flow;
2.System dynamic simulation of the single platform scale shows;
3.A computer can be real time parameter display and history data management;
4.System for each run of the cumulative yield, ratio and operation parameters such as start-stop time can query and print; Can realize manual and automatic batching undisturbed switching;
5.System password function, can guarantee the safety of system; In and out of the computer (core) of all signals for photoelectric isolation, isolation voltage above 2500 v;
6.System has self-diagnosis function, can diagnose for lack of materials, materials, and so on and so forth, and equipped with necessary alarm facilities.
The comparison of two kinds of control models:
Industrial computer control is developed on the basis of the instrument control, it adopt the mode of centralized control, at the same time it can realize the control of multiple scales.
Early ingredient control is given priority to with instrument control, with the improvement of computer performance and popularization, industrial control, has gradually become the mainstream control mode.Tell from the control principle, the two kinds of control modes, all adopts closed loop control method, from the collection quality and speed sensor signal, then the signal amplification processing transformation, system to deal with sampling numerical with PID algorithm, the final system 0 ~ 20 mA current signal (or 0 ~ 5 V voltage signal) control inverter output frequency, so as to achieve the purpose of control motor speed, meet the requirements of matching.
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Post time: Jul-31-2017