Weighing and filling machine adopts AT89S52 microcontroller as the control core, low power consumption, high performance 8-bit microcontroller designed by CMOS process. It has 8k internal in-system programmable Flash memory. The chip is fully compatible with the industrial 80C51 product instructions and pins, and the on-chip Flash allows program memory to be programmed in the system, and is also suitable for general programmers. The microcontroller is mainly used to collect the set value of the filling quantity, process the pulse signal of the weighing module, the touch screen drives the relay to drive the frequency converter to control the motor and the centrifugal pump to convey the materials, and through the weighing module to calculate the pulse signal of the pipeline flow, to get the actual weight of the liquid discharged by the weighing control system, and to control the motor according to the difference between the actual filling quantity and the set value, so as to realize the precise control of filling quantity according to the actual needs. Weighing and filling machine is mainly composed of DC frequency conversion motor, centrifugal pump, weighing instrument with touch screen control box, filling machine, cylinder filling gun, filter, pneumatic ball valve and so on. Among them, the control system is mainly composed of AT89S52 microcontroller, peripheral circuits, relays, potentiometers, weighing instruments and touch screen. Through the weighing module to calculate the amount of liquid, the sensor data into the control system control system and then control the motor operation, you can realize the real-time monitoring of the amount of liquid. The filling system mainly completes the collection of data from the weighing module, displaying the data by the touch screen, accepting the data input from the potentiometer, and controlling the stable operation of the control system by controlling the relays and solenoid valves, including the main program, the sensor data collection subroutine, the timer interrupt service program, and the LCD subroutine, etc. The controller enters into the program control, and then it will be controlled by the controller. After the controller enters the program control, it first detects the mode button to determine under which working mode the system is under. The set value of filling is collected by AD; then, the relay is opened. The motor operation collects the pulse number of the sensor and displays it on the LCD in real time. When the filling quantity corresponding to the number of pulses reaches the set value, close the relay to cut off the motor drive circuit. The contact switch of the solenoid valve of the filling gun in the quantitative filling control circuit remains normally closed, and the weighing module displays the current filling quantity.

Filling system using the image tracking system and fill the image to be able to three-dimensional information is fully reflected, with a sense of depth and hierarchy of the display device. Can intuitively feel the distance and distribution of objects in the image, so as to be able to more directly access to effective spatial information, through the stepper motor control grating the movement of the filling valve to realize the movement. Into the motor vibration using PWM (PulseWidth Modu ation broadband pulse modulation) mode of operation, respectively, the direction signal (DIR) and pulse signal (CLK) for the level triggering control of the stepper motor winding direction of rotation, to control the direction of movement of the stepper motor in the timing must be in advance of the pulse signal at least 10 us. pulse signal for the falling edge triggering. The pulse signal controls the rotation of the stepper motor winding, each pulse corresponds to an angle of rotation of the winding, which is equivalent to the control of the stepper motor to move the corresponding distance to control the trajectory of the filling gun valve for filling control.

Automatic filling machine in the weighing system in the pneumatic piston valve to fill the filling barrel, weighing module at the same time will be detected in the weighing system line after the completion of the filling of the filling of the target value, and will be the rapid transmission of this information to the terminal machine computer. Filling system hardware module is mainly composed of main control board, A/D conversion, man-machine exchange, filling valve, pneumatic ball valve, photoelectric isolation transmission, etc.; the main control board circuit is mainly responsible for the completion of the weighing system control and arithmetic work Signal acquisition circuit is mainly responsible for the filling of the corresponding instructions to complete the collection of the target value of the filling, and in the form of signals will be the pressure value transmitted to the next set of A/D conversion circuit is mainly responsible for the upper level of the signal converted into a signal that can be used to fill the bucket, and will quickly transmit this information to the terminal computer. A/D conversion circuit is mainly responsible for converting the signals transmitted from the first level into signals that can be effectively processed by the computer, the man-machine exchange circuit is mainly responsible for parameter setting and monitoring the control system operation status, the optoelectronic isolation circuit is mainly responsible for the signal isolation transmission and elimination of the system actuators and hardware circuits with each other in the interference; the output signal amplification circuit is mainly responsible for the output signals in the system for the appropriate amplification process, thereby facilitating the actuator to carry out the next step. The output signal amplifier circuit is mainly responsible for amplifying the output signals in the system to facilitate the next step of the actuator.