Development Of Automatic Control System For Concrete Mixing Station Based On Arm

With the development of urbanization in china, the quantity demand for concrete is increasing sharply. Meanwhile the requirement for the quality of concrete goes higher and higher. Traditional production line for concrete constrains the productive efficiency and the proportioning accuracy of concrete severely because of the out-of-date manufacturing equipments and low-level automation, so it can not accommodate to the competitive market. More and more manufacturing enterprises begin to use advanced electronic weighing systems and feeding equipments to promote the proportioning accuracy. Thus it is of great market demand to develop new accurate, stable and automatic control systems for concrete mixing plant.Taking widely used intermittent concrete mixing station as study object, this paper analyzes the development of batching plant at home and abroad, and then, according to production requirement and control features, the paper identifies the control plan which takes the lower machine ARM batching controller as control center to assure the metering accuracy.Considering the reality that traditional production line for concrete does not have high proportioning accuracy and based on modulization design concept, this paper uses embedded microprocessor unit with high performance price ratio as the central chip of batching controller, and enhances the proportioning accuracy of concrete manufacturing by designing corresponding peripheral circuits for weighing acquisition and velocity control. Meanwhile it achieves intelligent control algorithm and modular program design and realizes real time control of material feeding speed.Upper computer, as supervisory control computer, which is equipped with KINGVIEW supervisory program developed by Beijing Asia Control Technology Development Co., Ltd., is responsible for transmitting ingredients programs to lower computer and receiving real time data, thus realizes real time control of equipment condition in prodution process of concrete. In order to satisfy the credibility of data transmission, transmission rate of Modbus/TCP Industrial Ethernet protocol is used between batching controller and industrial host to achieve data communication. Using KINGVIEW WebServer framework, users who are authorized by server can also realize remote control through IE Browser.According to tests, compared with traditional concrete mixing plant, the automatic control system based on ARM for concrete mixing plant,which is mainly talked about in this paper, is not only easy to operate,stable and reliable,but also advanced in control technology and easy to modify. Therefor it can promote the quality of ready-mixed concrete, which can satisfy requirements for concrete in various engineering projects such as roads, bridges, and urban construction. Besides it also has referential value for other kinds of industrial monitoring systems.