The liquid ethanol barrel Filling machine combines an Electronic scale, weighing instrument and Filling system to achieve the barrel filling and weighing of containers. Thus, the filling system can be applied to various filling equipment. Users can directly access the PLC system and the terminal filling system to realize multi-range control and automatic control. This system digitizes the weak weight signal output by the electronic scale to obtain high-precision weighing data. 

The Liquid filling machine adopts intake speed regulation. The purpose is to use the imported throttling speed regulation method. When the speed regulating valve is installed close to the cylinder, the average speed of the piston is lower and the fluctuation is smaller. During the entire stroke, the piston speed gradually increases. The inflation pressure of the cylinder rises slowly and reaches the air source pressure slowly. The valve 1 and valve 2 cores are adjusted to a suitable number of turns. Thus, it ensures that the piston rod of the fast filling cylinder extends quickly and retracts slowly, thereby achieving the control of the opening and closing speed of the fast filling door. 

The metering filling machine is mainly composed of PLC, filling device, electronic scale and frequency converter. The touch screen inputs the chemical composition and proportion of various raw materials through the operator station. The flow signal is converted into a digital signal by the electronic scale and input into the functional module. It is compared with the set value, and the obtained control quantity is transmitted through communication to the frequency converter. The frequency converter controls the motor speed based on this signal, causing the filling amount of each feeding device to fluctuate slightly above and below the set value. The filling frequency is controlled by the PLC output and the weighing instrument settings. When a given ratio is selected, the on-site frequency converter simultaneously adjusts the control error according to the flow rate, material viscosity, given ratio, given flow rate and given frequency. By inputting the total filling volume and drop height, the feeding amount of the electronic scale can be automatically calculated, and tracking adjustment is made based on this feeding amount. 

The liquid filling machine uses the frequency converter to achieve two-speed regulation control for the feeding process, thereby enabling the functions of fast filling, slow filling and point filling for the materials. This ensures the accuracy and speed of the variable frequency feeding. After starting the pre-set metering feeding program, the weight of the weighing container is measured and stored. Then, the rotor pump, circulation pump switches, liquid feeding pneumatic valves, and the filling gun piston of the container are successively controlled. Among them, the feeding of the filling gun piston is controlled by two-stage electronic scales with dual measurement ranges, and each filling process uses both coarse and fine material feeding methods to ensure a weighing accuracy of 98% to 99%. The weight of the material is converted from an electronic scale weighing instrument to an electrical signal, which is then read into the PLC for weight calculation. After removing the container weight, it is compared with the set value, and the result serves as the basis for controlling the material switching or the conversion between coarse and fine feeding.