The Central weighing and unloading system adds the required materials into the mixing bin in turn according to a certain ratio. At the same time, PLC monitors the pulse signal sent by the material level meter to determine the position of the material in the bin, so as to control the on-off of the charging valve; After the feeding is completed, according to the preset mixing delay time, the PLC starts the mixing motor to ensure that the material is fully stirred in the mixing bin to complete the mixing operation; Then enter the discharge and pressing stage, the PLC controls the discharge valve action, the material is output from the mixing bin, pressed into the storage tank, complete a cycle of automatic batching control process.
020-34563445The central batching control system adopts small and medium-sized distributed control, achieving "decentralized control and centralized management", overcoming the problem of "concentration of risks"; the upper computer and the lower computer are relatively independent. It has manual, automatic, and semi-automatic switching functions. During online operation, it exchanges information with each other according to specific protocols. When offline, a single scale can independently achieve process closed-loop control.
The upper computer is far from the operation site, improving the stability of the weighing control system and improving the working environment of the operators; the lower computer uses a programmable controller, with strong anti-interference ability, simple programming, and can operate reliably in harsh environments for a long time; it uses PID regulation to improve the Batching system's batching accuracy and can set the optimal working sequence according to production needs, better solving the problem of material head and tail, and automatically modifying the material ratio and batching.
The batching scale has three control modes: manual, semi-automatic, and automatic. During manual operation, the switches of the on-site control box and instrument box are set to the manual position, and control is achieved through the start-stop buttons, potentiometers, frequency meters, etc. on the on-site control box, with the weighing instrument displaying the instantaneous and cumulative quantities of the materials. Emergency operations can be carried out when manual maintenance and debugging are required.
In semi-automatic mode, the switches of the on-site control box and instrument box are set to the automatic position, and control is achieved through start-stop buttons, frequency meters, weighing display instruments, etc. Adjust the batching quantity and display the instantaneous and cumulative quantities of the materials; you can also set the recipe through the on-site operation screen to adjust the batching quantity. It is mainly used for on-site operation when no upper-level control is required.
In fully automatic mode, the switch of the instrument box is turned to the linkage position, and the upper computer controls the belt start-stop. Dynamic display of each material quantity, belt operation status, and various alarm indications. It can collect and process weighing signals and switch quantity states from each batching control loop to achieve automatic control of the entire batching system's belt feeding, weighing detection, material quantity adjustment, material bin selection and switching, etc. At this time, the on-site manual control of the batching system does not work, and all operations are carried out through the control room.
The main functions of the batching system
Monitoring function: Detect and monitor parameters such as instantaneous flow rate, daily accumulation, monthly accumulation, and annual accumulation during the batching process;
Screen display: The computer monitor can display the operating status of relevant control parameters during the batching process, as well as real-time display of the batching curve and table;
Print management: Components can be printed as reports at any time and saved for query;
Communication function: The industrial control computer exchanges data information bidirectionally with PLC and instruments;
Data processing: It can automatically process the collected signals and output to the corresponding control quantity;
Control function: Automatically control the normal operation of the equipment according to the corresponding set values before operation, including PID regulation;
Alarm function: The upper computer alarms in the form of pictures, sound and light signals for various parameter over-limit or abnormal equipment status.
