The automatic batching system is based on the electronic weighing system which is composed of the original weighing module and weighing instrument, and completes the automatic control of the whole process of batching conveying and mixing from the exit of the bin to the exit of the mixer by means of fieldbus communication and the existing peripheral executive equipment. The dosing system displays and monitors the alarm prompts and interlocks of the whole system, and completes the man-machine dialogue of formula management, production data management, equipment operation status management and production command to meet the mixing requirements of production.

The automatic batching system ensures the real-time communication between the upper PC and PLC, directly collects the weight signal through the electronic weighing, and automatically controls the weighing. The operator input the feeding information (feeding type, weight, etc.) on the HMI of the upper computer through the keyboard or mouse, monitors the whole process of feeding control, and prints the feeding results and production reports. It is a practical and effective method to realize the integration of measurement, control and management in feeding process.

The automatic dosage system consists of an industrial computer, PLC programmable controller, powder dosage, liquid dosage, micro dosage and control system. This control system is a kind of automatic weighing system with vacuum feeding, dosing screw quantitative dosing, weighing hopper automatic weighing and dosing, and cumulative weighing at the same time. It is suitable for precise measurement of materials and automatic dosage in the production process.

The automatic dosage system consists of weighing module junction box, weighing instrument, wiring cabinet, PLC control cabinet, and the main hardware consists of two computers, high-performance microcomputer controllers, human-machine interface, high-speed and high-precision weighing units and internationally famous low-voltage electrical appliances, combined with self-developed professional control software to realize the dosage system for chemical liquid production; at the beginning of each dosage cycle, the difference between the previously set dosage quantity and actual dosage quantity will be taken as the compensation value for the set dosage quantity of this cycle in order to eliminate the accumulated error of each scale dosage quantity. At the beginning of each dosage cycle, the difference between the previously set dosage amount and the actual dosage amount is taken as the compensation value for the set dosage amount of the current cycle, so as to eliminate the accumulated error of the dosage amount of each scale.

The automatic batching system is connected through the communication bus to form a network, decentralized control, centralized operation and centralized management, which is easy to achieve centralized command, scheduling and management of the whole plant, automatic detection and control of the entire production process, and automatic control of the start and stop of some electrical equipment. Each site workstation completes the collection and control of various analog signals (pressure, temperature, flow, valve opening, etc.) and various switching signals (motor, position and material level, etc.), and completes signal processing, sequence control, control algorithm, PID adjustment and fault diagnosis in the site station.

After the batching system enters the feeder from the bin, the weighing signal is processed by the controller to control the vibration feeder to drop the material at a certain rate. When the set value is reached, the feeding stops. Confirm that when the charging position is specified, and confirm that there is no material in the silo, the charging is opened according to the operator's instruction, and the material enters the charging silo; When all the measured materials enter the feeding bin, and confirm that the door of the measuring feed bin is closed, add the next batch of materials according to the operator's instruction, and start the walking motor of the feeding bin according to the operator's instruction or automatic program when starting, to complete the batching process.

Batching system has convenient and flexible Chinese operation interface, real-time data acquisition, display (e.g. weighing) and processing; control operation and control output; equipment and status monitoring; alarm monitoring and processing; data communication with DCS system; historical data management; log record; process flow screen generation and display and dynamic screen display of tank operation; initialization of batching and dosage process; online calculation and online modification; self-diagnosis and self-recovery of batching; database maintenance; report printing; batching function expansion; communication interface with management level, etc. Calculation, online modification; dosage self-diagnosis and self-recovery; database maintenance; report printing; expandability of dosage functions; communication interface with management level.

Automatic dosage system will weigh the hopper and the feeding mechanism as the whole scale body, through the weighing instrument or the upper computer non-stop weight signal sampling on the scale body, calculate the weight in the unit of time as the ratio of the instantaneous flow rate of the weight, and then through a variety of hardware and software filtering technology, resulting in the control object can be used as the "actual flow rate". Then FC through the PID feedback algorithm, close to the target flow rate control operation, the output regulation signal to control the frequency converter and other feeder controllers.

The dosage system and weighing instrument realize serial communication based on the development environment. The data from the weighing instrument is sent to the host computer in real time through the serial port, and the read data is intercepted and converted, and the weighing data can be displayed in real time on the operation screen, and at the same time, the weighing data can be stored in the database for querying and tracing the data, which is not only convenient to supervise the weighing process, but also to restrain the worker's operation. The upper computer software of automatic dosage system is designed with PLC program. The WINDOWS-based upper computer software has the functions of real-time process monitoring, overweight/overtime alarm, alarm processing, automatic data saving, querying historical data, printing formula and historical data. The feeding system adopts the rotating feeding basket installed on the screw to receive the materials, which effectively solves the problem that the feeding time in the whole production time accounts for too large a proportion in the dosing program of the lined-up dosing system. The weighing terminal from the signal to rotate to the receiving position is only 2 baskets apart, which is much faster than the receiving speed, and is conducive to improving the efficiency of the entire system. Sequential pick-up method, so that each recipe of small materials in a set order of cascade, so that the process personnel can easily identify the weighing of small materials and troubleshooting in parallel. The dosage weighing device adopts silo screw machine, the material flows to the mixer through the silo, each mixer has two weighing modules, and connected to the junction box, a speed weighing module, the signals through the junction box to the weighing instrument, and then by the dosage weighing instrument will be analog signals and pulse signals to the PLC, PLC processing output signals to the computer to monitor the operation of the PLC will be the computer commands to the weighing instrument for processing. The PLC will transmit the commands from the computer to the weighing instrument for processing. Batching scales and electrical interlocking, can be set from the computer flow, control to the dosage of dosage scales, can be switched through the "switch" button to switch the control, the frequency of dosage is the computer through the PLC to the frequency converter communication to control the output of the frequency converter, so as to change the rotational speed of the silo screw, in accordance with the required amount of dosage of dosage scales. The weighing flow setting at the weighing terminal is set by calculating the required value and outputting it to the PLC, then inputting it to the dosage weighing instrument and adjusting the frequency of the silo screw machine after PID calculation in order to achieve the required amount of material to be discharged.