The batching machine detects the flow rate of the spiral scale through RS485 communication, and gives the control current of the motor and non-ionized pump according to the ratio value. The PLC output of the Electronic scale controls the motor and frequency converter, so that the powder discharge changes with the flow rate of the spiral scale, and the motor proportioning control is PID regulation control. The flow rate of auxiliary material scale is collected to the control host through communication. According to the process requirements of the proportion, calculate the corresponding tracking flow transmitted to the PLC, PLC gives control current, control the auxiliary material scale frequency converter, so that the corresponding dosage flow control in the tracking flow of the most range. Through the start-stop button to realize the start-stop control of the equipment, can also manipulate the human-machine interface after the matching process on the start-stop button. Start-stop is realized by controlling the PLC.

Automatic Dosage system will hopper scale and feeding mechanism as the whole scale body, through the weighing instrument or the upper computer non-stop weight signal sampling scale body, calculate the weight per unit of time change ratio as the instantaneous flow rate, 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 the FC will carry out the control operation close to the target flow rate through the PID feedback algorithm, and output the regulation signal to control the Feeder controller such as the frequency converter.

Alarm event

When automatic weighing starts, if one of the discharge valves is not closed, and the weighing terminal or the dosage does not detect the signal to close the discharge valve, the Weighing system will sound an alarm, pause the weighing process of the weighing instrument, and make the operation indicator light flash. If an alarm occurs, the automatic discharging will not take place, until the fault is eliminated or the cause of the alarm does not affect the discharging, press the reset button and then press the "DISCHARGE" button, the discharging will continue.

Switching alarm

When automatic discharging starts, first check whether each kind of raw material is switched in place, if switching is not in place or switching is not consistent, the alarm system starts to alarm, and automatic discharging can not be carried out. Through checking, it is considered that the material can be discharged, press the reset button and then press the "Discharge" button to start discharging.

2.3.3 Alarm if the reactor kettle is full of raw material slurry has not been discharged, but still put the material to the pot, resulting in an alarm signal, automatic discharging can not be started. After checking and confirming that the material can be discharged, press the reset button and then press the "Discharge" button to start automatic discharging.

Emergency stop

During the weighing process, if you need to stop weighing due to an emergency, press the self-locking "Weighing Emergency Stop" button, the feed valves of each scale will be closed and the electronic scale will stop weighing. When you need to restart weighing, turn up the "Emergency Stop" button and press the "Start" button to restart weighing. When discharging automatically, press the "Discharge Emergency Stop" button, the system will close all discharge valves and stop discharging, mixing and conveying.

Human-machine interface

The human-machine interface of master station and slave station adopts the configuration software of Configuration King and the communication program developed by VB, which consists of pre-matching process, post-matching process, pre-matching formula, parameter setting, history curve and alarm information, etc. The main menu of dosing consists of a series of buttons. The main menu of dosage consists of a series of buttons. When the mouse rests on the menu buttons, the buttons are raised, and different buttons can be clicked to enter different screens. There are two types of function screens for operation, one is display operation screen, i.e. display data (display mode is digital, curve, historical trend, etc.), function soft switches and soft buttons for operators to operate; the other is process flow screen, which displays the process arrangement of the equipment, the process flow and the corresponding test data.