The automatic diluent Filling machine is made with PLC programmable controller. It adopts a two-stage automatic filling method for both large and small materials. It has the function of automatically detecting empty barrels and the function of not filling when the scale is empty. The controller is equipped with manual buttons for all actions, and a dual-window display dedicated filling control instrument. It can display information such as target volume, filling volume, barrel count, time and date. It also includes an Electronic scale in the front, a repeater scale system, an LMC motion controller, LXM series servo drives and servo motors, an upper computer monitoring system, etc. The servo motor is used to control the stroke of the rotor pump, thereby achieving control of the filling volume. Before filling, the weight of the empty barrel is obtained by the front electronic scale, and after filling, the filling weight is obtained by the rear electronic scale and sent to the weighing instrument. The weighing instrument will promptly process the filling data to obtain the weight deviation, and the filling algorithm will calculate the control of the large material volume. The weighing control system will send the control volume to the servo driver, drive the secondary rotor pump to execute the early closure of the small material filling valve and control the small material filling, and the upper computer connects to the weighing instrument via Ethernet to read the filling data in real time and can set process parameters to monitor the operation of the production line. 

The Liquid filling machine multiplies the measured motor rotation frequency and the motor's running speed to obtain the actual feeding rate. Then, it integrates this product value with the time ratio to obtain the actual feeding weight based on the filling volume. The control system continuously compares the actual feeding rate with the preset value and sends the comparison result to the PID for calculation. Based on the deviation size, it outputs corresponding signal values. Through the frequency converter, the speed of the motor is changed to adjust the feeding volume, making it consistent with the set value, thus achieving the optimal feeding rate. At the same time, while measuring the actual feeding rate, this signal is compared with the preset feeding rate signal or the feeding rate signal required by the material tank batching control system. When the measured feeding rate is lower than the set value, the frequency converter is used to increase the speed of the main motor, that is, to change the speed of the Feeding machine, thereby increasing the feeding rate of the feeding machine and making the actual feeding rate of the feeding machine the same as the required feeding rate; when the measured feeding rate is lower than the set value, the frequency converter is used to decrease the speed of the main motor to change the speed of the feeding machine, thereby reducing the feeding rate of the feeding machine to meet the needs of the material tank batching. 

After the filling process and the cap pressing are completed, the device that drives the grasping mechanism precisely locates it at the designated unit. Then, it grabs the filled barrels on the material platform and transports them to the designated location before lowering them. The servo motor drives the mechanism, and by utilizing the high-speed pulse output function of PLC, through PTO programming, the accurate stacking control of the mechanism can be achieved. When a pulse signal is given to the stepper motor, the stepper motor rotates by 0.9 degrees; when two pulse signals are given, the stepper motor rotates by 1.8 degrees. And so on. By continuously providing pulse signals, the stepper motor can operate continuously. Due to this linear relationship between the electrical pulse signals and the rotation angle of the stepper motor, the stepper motor has been widely applied in speed control and position control aspects.