The automatic Filling machine for epoxy resin is composed of S7-200 PLC, weighing instrument ICS241 and filling solenoid valve. The PLC is connected to the weighing instrument via the RS232C communication port. The Electronic scale and the weighing instrument are connected by a data cable. When the preset quantitative weight is reached, the weighing instrument controls the pump to stop and the pneumatic valve to close. The PLC controls the filling gun piston on the scale body to operate simultaneously when the container is fed. The photoelectric switch on the electronic scale detects the signal from the container passing by and controls the motor to stop when the container reaches the filling position. The roller frame is controlled to stop by the PLC and automatically resets the weight. The filling valve is driven down by the stepper motor to reach the lower limit position. The travel switch emits a signal, and the PLC controls the filling valve to fully open for filling. After the filling is completed, packaging or sealing treatment is carried out. 

The Liquid filling machine is composed of a feeding hopper, pneumatic feeding and filling valves, an electronic scale, a conveyor, a rotor pump speed control drive part, a filling mechanism and a PLC electrical control part. The material to be filled is conveyed by the conveyor device to the pre-filled container. When the filling weight is set, the pneumatic feeding valve automatically opens, and the material enters the electronic scale from the pre-filled container. When the material in the electronic scale reaches the rated filling weight, the pneumatic feeding valve automatically closes. When the conveyor is feeding, the amount of material reduced in the feeding hopper within a unit time is the actual filling amount, which is transmitted to the PLC through the electronic scale and displayed as the actual material quantity in the hopper at that time. This actual filling amount is compared with the preset standard quantity at any time. The deviation is adjusted by the PLC randomly changing the motor speed of the rotor pump to approach zero. At the same time, the corresponding target quantity is calculated and displayed. The pre-filled container adds material to the electronic scale through the feeding valve simultaneously. The control system automatically switches to the weighing feeding mode when adding material. When the electronic scale finishes adding material, the pneumatic feeding valve automatically closes, stopping the feeding. The system then automatically enters the metering feeding state, and this cycle repeats. The electronic scale is intermittently fed with material, achieving high-precision automated precise feeding. 

The automatic filling machine achieves the amount of measurement by the number of rotations of the screw. To achieve adjustable measurement size and improve measurement accuracy, it is required that the rotational speed of the screw can be adjusted and the position be accurately positioned. A stepper motor is used to control the rotational speed and number of rotations of the screw. Without overload, the rotational speed and stopping position of the stepper motor only depend on the frequency and pulse number of the pulse signal. The frequency of the PLC output is controlled in conjunction with the set value of the weighing instrument to control the frequency of the feeding container. During PLC output, the frequency, target quantity and frequency setting are used to control the on-site container frequency converter simultaneously. When selecting the target quantity on the operation screen, the set quantity for filling and the target quantity rate for filling are input, and the filling amount of the electronic scale can be automatically calculated. Based on this filling amount, tracking adjustment is carried out. The target quantity is controlled for filling by the set quantity area of the filling gun for the electronic scale. The given frequency method is required for PID parameter tuning of the electronic scale. The frequency setting is the output frequency of the fast or slow speed of the on-site container frequency converter. This given method is used for physical transportation. When the frequency is given, the filling amount of each electronic scale is compared with the weighing value, and the setting quantity of the electronic scale is corrected according to the difference. This method is intuitive and convenient.