Weighing Filling machine is a set of high-precision electronic technology, for liquid small and medium-sized capacity weighing, filling as one, a new type of machine, electrical, instrument integration, the use of motor drive drum, automatic transmission and weight detection, the use of fast, low speed two-speed filling, with high quantitative accuracy, quantitative value arbitrary setting and other advantages. With the function of frequency and cumulative weight adjustment, it is an ideal filling equipment for weighing and filling integration. The hardware configuration structure includes the central processing unit and I/O expansion unit, detection components (photoelectric switch and proximity switch, etc.), operation panel (touch screen, button switch and indicator light), control components (AC contactor and solenoid valve) and execution components (motor and cylinder), etc. The touch screen is used as the operation interface of the filling machine control. Accept the operation instructions from the operator and indicate the running status of the equipment, and display the machine start and stop, function switching, working condition detection, data input and modification, running status, fault alarm in the form of a menu, so that the parameter configuration becomes more convenient; The detection element detects the material measurement, the feeding end signal, and the completion of the action of each part. PLC automatically cycle scans the current status of each input and output point, and updates the status of the output point according to the logic relationship determined by the ladder diagram program. PLC sends a signal to the cylinder to drive the filling valve to work, the liquid in the pipeline flows into the weighing barrel, and the weighing module above the weighing barrel sends a signal to the PLC to control the operation of the cylinder. When the weight is fast to the required weight, L sends a signal to the cylinder to drive the filling valve, so that the discharge speed is slow, when the value of the weight is reached, the PLC sends a signal to the cylinder, the filling valve is sealed, the signal that the weighing value is no longer changed is transmitted to the PLC, and the touch screen reads the filling and weighing data.

In the Filling system, piston metering is adopted, servo motor drives ball screw, flow distribution module adopts cone valve type check valve, liquid level tracking module is driven by stepping motor to achieve quantitative setting of weighing target value, automatic control module adopts widely used PLC as the control center, and detection module adopts automatic weighing method. The driving force is generated by the rotation of the filling servo motor, which drives the piston rod to move up and down under the transmission of the ball screw. In order to ensure the smoothness of the movement of the slider, a linear guide rail is installed on the left side of the slider. Driven by the motor, the piston rod of piston type metering moves up and down, the metering cylinder is cylindrical structure, and the movement distance of the piston rod corresponds to the weight of the suction and filling of the metering valve. A check valve is selected as a flow distribution mechanism. The check valve at the inlet is opened and the check valve at the outlet is closed. During liquid filling, the outlet check valve is opened and the inlet check valve is closed, thus the process of weighing liquid filling is completed. The filling nozzle is connected to the distribution structure through the steel wire hose, and the filling container is placed on the weighing tray. The weighing data is tracked and detected by the stepper motor and ball screw, so as to ensure the constant distance between the nozzle and the liquid surface of the container, and reduce the spatter and foaming during the filling process. Changing the filling amount, filling speed and other filling parameters on the man-machine interface PLC can send corresponding control signals to the servo motor and stepper motor according to the input parameters to achieve the control of different filling parameters.