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 dosing system applies the configuration software to complete the data acquisition and process control support a variety of communication protocols to provide users with a variety of equipment support, colorful dynamic screen and the powerful functions of the system, so that you can easily operate with a strong scalability, easier to integrate with other systems, and more effective protection of the user's investment. The redundant station utilizes two redundant CPUs to improve higher availability and safety, and the switch automatically switches from the running system to another in case of failure.

Automatic batching system is a complete set of automation equipment to realize dynamic weighing and batching control through electrical control management and visualization man-machine software configuration. The electrical control part of the system adopts Siemens PLC, which is programmed and controlled according to the production requirements; the software adopts man-machine configuration, which is used to control the weight and flow of the materials loaded into the weighing hopper through the monitoring system and the PLC program according to the technological requirements so as to realize accurate measurement and batching. The software adopts man-machine configuration. With strong stability and high cost performance, the system can provide accurate measurement data and control means for production control and management of various industrial sites.

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.

Mixing and feeding system uncertainties and internal and external interference as a whole for processing, the use of digital technology to compare and analyze it with the traditional PID controller, weighing controller to calculate the actual amount of feed, when the actual amount of feed to meet the feed set value to close the feed valve, from the whole process of action can be seen, the valve closure lag will inevitably lead to feeding error, the value of the error is about the lag time and the closure of the instantaneous volumetric flow rate, The error value is the product of lag time and instantaneous volume flow rate and fluid density at the time of closing, in which the lag time is all the time between the output of the valve closing signal from the weighing controller and the shut-off valve shutting down, "i.e., including the lag time of the relay's action and the shut-off valve's action lag time.

The automatic mixing equipment adopts decentralized control and centralized management control mode, and the three-level structure realizes the two-way coordination of process demand and energy saving of the batching system. Decentralized dust point local realization of vibrating screen, hopper and other stations of the branch adsorption point automatically open and close, effectively reducing the dosage of non-dusting ventilation requirements; the central controller to achieve the dust point of the centralized monitoring of the working conditions, according to the operation of the workplace to calculate the real-time demand for the kettle dust dosage of the air volume. Thus the frequency control value of frequency conversion operation is given, and the frequency adjustment instruction of 4~20mA is transmitted to the frequency converter of dust removal fan to realize the continuous variable condition adjustment of dust removal air volume.

The automatic feeding system picks up the weight through the pressure weighing module, amplifies and filters the picked up weight signal, enters into the A/D converter for analog-to-digital conversion, and then sends it to the microcontroller to analyze and process the signal, and outputs the result to the industrial control through the RS232C communication serial port, and at the same time, makes the corresponding reaction and performs the corresponding operation according to the result of the signal.

Explosion-proof electronic scale has man-machine interaction, communication, display and storage, printing and other functions, and has data, graphic display, status monitoring, data input, information storage and other functional screens related to operations. Real-time process data monitoring, simulated display of process flow, real-time data record review, operator authority setting, process parameter setting, event alarm setting during operation and manual and automatic control switching. Monitoring system in the field control weighing instrument real-time display flow, load, cumulative value, temperature and so on. Temperature indication through the field temperature display instrument, pressure indication through the field pressure and motor through the field display instrument remote to the central control room centralized display.