Study on measurement and control system for concrete mixing plant

Generally, commodity concrete mixing plant measurement way of control mode is by electronic adjustable speed belt scales or spiral scales constitute, this species control mode most obviously of features is various material of ratio Zhijian does not exists contact, each species material of measurement are has independent of control unit, main is through on commodity concrete mixing plant equipment total of production capacity and the material of rated than of accounting to be control of, this automation control system in actual application of process in the exists with must of defects.

First of all, this kind of control mode under the condition of continuous and stable supply of materials in order to guarantee the stability of grading in order to ensure the accuracy of material. However, in actual operation, there are material supply system is not smooth, ingredients are not continuous and stable supply situation, so the actual use of such control mode, the material ratio reduction occurs. Secondly, although each control unit can work independently, and PID automatic cycle, but due to various units of measurement do not contact cannot be achieved the material ratio control, grading is not stable. Cause uneven concrete batching plant the key factor is the number of turns a mixer cannot be changed. Through the analysis of the above-mentioned reasons, should change the control mode of the equipment as a whole will be able to solve these problems, and to further consider the use of programmable logic controller (PLC), changing the stirring shaft rpm, perfecting the control system of automatic control functions, improve the technical performance of the equipment.