The electric control system of the mixing station can carry out system self-check and automatic operation on the technological process of the complete set of equipment, and the various kinds of controls can not only have serial connection, but also have parallel and overlapping timing control, and carry out logical program control under certain interlocking constraints.The metering batching system can ensure the dynamic metering of various raw materials within the set mix ratio and specified precision range.Computer management system has all kinds of information and parameter setting and storage, control data processing and modification, production operation monitoring and common fault alarm, production operation data record and printout management functions.The industrial TELEVISION monitoring system can monitor the operation of distant sites and important parts.

The electrical control system of the mixing building also has the operation control system of the aggregate collecting and transporting device and the powder transporting device.The shovel type mixing plant has its own electric equipment for operating the shovel.The electrical control system of the other forms of mixing stations exercises centralized and unified operation and control over the operation of complete sets of equipment.

The operation and control of the work flow of the various systems and devices in the mixing station are manual, semi-automatic and fully automatic.Automatic control is to implement automatic and compulsory program control for the whole technological process through the set program, which can complete the whole process of concrete production without manual monotonous repetitive operation.Semi-automatic control is related processes to implement automatic control of the serial connection, and the related processes of parallel cross with manual operation sequence control, is suitable for a certain technological requirements of the implementation of the process execution device takes over the design of the timing, the automatic control for interlocking the constraint conditions can't meet, and the control program when it is not need to change the operation of the control.Manual button operation, suitable for single point commissioning and maintenance, as well as site conditions do not have continuous automatic operation occasions.

The control system of the core technology is process control, the early use of the conventional relay and contactor control station, with the rapid development of electronic technology, experienced a single machine, microcontroller, programmable controller and industrial computer and so on several stages, PLC as lower machine, microcomputer control system become the industrial computer for the upper machine mixing station control system of the typical model.Programmable controller is designed for industrial control applications, has strong anti-interference ability and large driving power, can directly control the electrical equipment, and its module structure combination is convenient, easy to expand, can adapt to the system configuration of various products.The source program can be used for trapezoidal diagram programming on personal computer by graphic programmer or mnemonic programming by handheld programmer.

Either way, a written program can be written to the PLC's master controller through a communication interface, and can be modified, debugged, breakpoints set, and single-step executed.PLC, as a lower computer unit, is widely used because of its wide applicability, high reliability, and high programming efficiency and debugging speed.But if the PLC control system control does not have the upper computer, then has the program development is not very convenient, the control command input and the information output has the limitation and so on shortcoming, and because the memory is limited, cannot realize more management function.Industrial computer as the upper computer, can store a large number of mix ratio for users to choose, and call or modify mix ratio is very convenient;The whole process dynamic of concrete mixing station can be intuitively simulated to realize real-time monitoring;Can automatically record and store all kinds of data and print tabulation, to achieve advanced scientific management functions;In conjunction with other electrical installations, highly efficient production process automation and optimized concrete quality control can be achieved.

The key step of program control is to control the opening and closing of the actuating component of the feed device in the metering process.Early mechanical levers controlled the opening and closing of storage bin valves by using mercury switches, microswitches or contact-free switches on the libra bar when it rose or fell.The preset weight of the material is set by using the weight and weight on the scale bar.There are also pendulum type or spring type watch head of the disk, using the moving pointer to rotate to coincide with the fixed pointer permanent magnet induction switch to send electrical signals, control bin valve opening and closing.The preset weight of the material is set by the position of the fixed pointer on the dial. Multiple fixed Pointers can be set to achieve cumulative measurement.The so-called mechatronic scale works by opening and closing the output door of the mechanical lever system through sensor components.Early in a blender, some pointer mounted on a shaft in the activity of the disc according to a synchronous rotating potentiometer accurately, the potentiometer two fixed end and a fixed voltage, the output voltage value of the potentiometer movable arm with the rotating shaft angular displacement quantity change and is proportional to the weight of said material value, the potentiometer movable arm output voltage value of the input to the special design of electronic circuits, and represents the ratio of the weight of preset voltage value, equal to output the control signal, close the valve.In addition, analog punch card readout is used to set the weight ratio, servo motor drives the setting value pointer, and the mechanical and electronic scale with the digital head showing the predetermined value.