The liquid pesticide Filling machine collects the pulse count from the Electronic scale and displays it on the touch screen in real time. When the filling volume corresponding to the pulse count reaches the set value, the relay is turned off to cut off the motor drive circuit. In the quantitative filling control, the electromagnetic valve contact switch of the filling gun in the circuit remains in the closed state, collecting the data from the electronic scale, displaying the data on the touch screen, accepting the input of potentiometer data, and controlling the stable operation of the system through the control of relays and electromagnetic valves, including the main program, data acquisition sub-program, timer interrupt service program, and display sub-program, etc. After the controller enters the program control, it first detects the mode button to determine the working mode of the system. It collects the set value of filling through AD, then opens the relay, and the motor runs to collect the pulse count from the electronic scale and display it on the touch screen. The weighing instrument is a full Chinese touch screen display. The quantitative control value can be changed arbitrarily as needed, and it can be completed by operating in the weighing instrument. From the bucket extraction process, it adopts fully automatic production. Just place the same specification and model buckets neatly at the designated position, and the professional mechanical hand will accurately take out one packaging bucket each time, and precisely transport the packaging bucket to the filling nozzle through the power track. There is an automatic metering device, which will directly fill the material into the packaging bucket conveyed by the filling nozzle according to the preset standard quantity. The entire process is accurate and fast, without causing material waste, and will not cause environmental pollution. After the bucket is filled, it will be transmitted through the power track to the next stage. 

The Liquid filling machine is a weighing device that automatically adds materials of a certain weight (or volume) into one or more containers. It is controlled, monitored and managed by PLC. The on-site control information is connected to the PLC through a bus communication method. The PLC records and prints various parameters of the materials, such as type, quality and frequency. It is a weighing device that determines the mass of an object by multiplying the volume of the weighed object by its specific gravity based on the weight measured by an electronic scale. It uses an electronic scale during the falling of the materials, and the force acting on the container can be decomposed into the gravitational force of the materials inside the container and the impact force of the material flow. The initial state where the material flow is relatively stable is considered a constant. The gravitational force of the material is a linear function of time. The flow rate can be calculated using the dynamic control parameter identification method. When the integral of the flow rate reaches the weight set value, the motor is turned off. Due to the effect of the overshoot, the flow significantly decreases to zero. During this period, the parameters for calculating the flow rate are fastly varying. Using the static control parameter identification method, the weight of the materials inside the container is directly calculated. 

The weighing filling machine uses the feedforward measurement of the disturbance quantity entering the process control, and generates appropriate control actions based on the signal to change the control quantity, so as to keep the controlled variable at the set value. The disturbances entering the control system must cause the controlled variable to deviate from its set value through the internal connections of the controlled object. The invariance principle eliminates this influence of the disturbance on the controlled variable through the correction effect of the feedforward controller. It is mainly composed of the Weighing system, data acquisition unit, control execution unit, frequency converter, filling equipment, and material output mechanism. In the entire Filling system structure, the signal acquisition unit and the filling gun execution unit of the material system are located between the container center on the electronic scale and the signal is converted to A/D, digitizing the weight information of the material; the preprocessed signal is sent to the central control PLC; various necessary controls of the electrical components of the scale body are carried out; the frequency converter serves as the driving power supply for the feeding motor, receives the control signal from the control unit, controls the speed of the feeding motor, and the feeding motor is responsible for driving the filling mechanical mechanism to achieve the purpose of controlling the feeding amount. The central control PLC is the core of the entire weighing system, responsible for the coordinated control and management of the entire system, as well as the exchange of human-machine information with the operators.