The hardware structure of the dosing system is mainly composed of UPS, PC, printer, serial conversion card and PLC, electronic scale, valve, motor, position detection device and other actuators. Through the electronic scale to continuously collect the amount of feed, RS232/RS485 serial conversion card and PLC communication, high-speed, stable and accurate transmission of data, when the dosage set value of one advance stop, dosage of real-time control process is completed by Siemens 115U PLC controller, and at the same time the use of communication with the upper PC, in the upper computer to complete the dosage parameter settings, data management, statistics, reports, prints and other functions. report, printing and other functions.

The automatic batching system operates synchronously through the conversion factor, and automatically stops the pump and closes the valve when the pre-set number of sent kilograms is reached. The weighing system tracks the liquid temperature in a wide range and compensates the density, which excludes the volume change caused by the liquid temperature change and other influences on the measurement, and ensures the accuracy. It has realized many functions, such as quantitative filling, multi-channel starting, long time protection parameters, etc., so that the whole process of measurement control system has realized automatic control.

The lubricating oil dosing system realizes PLC on-line control, the valve position and discharger position signal detection adopts load sensor, and the bin location adopts heavy weight type material level meter, which can realize continuous warehouse location detection. The control unit is mainly a touch screen, PLC as an auxiliary control system, man-machine interface display ratio parameters (formula) and monitoring and recording real-time data. According to the speed of weighing material, the lead amount is provided. When the weight is detected to reach the set value, the lead amount is subtracted, and the control instrument closes the feed valve. The lead amount can be manually corrected or automatically corrected, so that the control instrument can control the batching precision of each batching scale to reach the set target value.

In the batching system, the weight of the spiral material is detected by the computer combined with the measurement control and weighing module of PLC, and the corresponding electrical signal is output, which is converted into a 4-20mA current signal by the signal transmitter, and then converted into a digital signal with strong anti-interference ability and long-distance transmission after photoelectric isolation by the analog acquisition card, and sent to the computer. The weighing module detects the speed of the spiral operation, converts it into corresponding pulse signals, and sends them to the computer after photoelectric isolation. The computer communicates with PLC to detect the weight and the running state of the feeding motor.

The feeding system measures the weight by means of a load cell under the reactor scale frame to determine the weight of the material on the reactor. A digital speed sensor is mounted on the tail drum or rotating equipment and continuously measures the pulse output of the speed sensor at the feed rate, which is proportional to the screw speed. The velocity signal along with the weight signal is weighed and fed to the belt feeder controller to generate and display the cumulative/instantaneous flow rate. The feeder controller compares the flow rate to the set flow rate and the controller outputs a signal to control the inverter to achieve the dosing requirement.

The weighing system is based on a load cell, and through signal amplification and a microprocessor, the weight value is converted into an electrical signal output, which can be used for data processing by a computer. It is suitable for controlling the production process with computerized technology.