Development Of Human-computer Interaction System For Machine Offset Press Based On QT

The unit-type offset printing press has many advantages,such as fine print quality,rich hierarchy,and high production efficiency,making it widely used in the fields of textbooks,books,and magazines.The electronic shaft control system has greatly simplified the transmission mechanism of the unit-type offset printing press and brought revolutionary progress to its development,making it an indispensable system for high-end offset printing equipment.However,due to the lagging development of key technologies such as servo drives and fieldbus,the development of electronic shaft control systems in China started relatively late,resulting in the domination of foreign brands in high-end web-fed offset printing press electronic shaft control systems.Combining specific printing press requirements with domestic servo drive system development to develop an electronic shaft control system has become the primary problem faced by domestic printing equipment control system companies.Therefore,this project,sponsored by the National Key Research and Development Program and other funding projects,conducted the development of a web-fed offset printing press humanmachine interface system based on Qt.The main research contents include:(1)Analyzing the functional structure of the unit-type offset printing press,and designing a master-slave electronic shaft control system based on a domestic servo system according to functional requirements.The human-machine interface system is developed using the combination of Qt and OtoStduio.A method based on shared memory is proposed for highefficiency communication between the interactive interface process and the control program process,improving the real-time,stability,and reliability of the Qt-based human-machine interface system in the electronic shaft control system application.(2)Designing the application layer,system layer,and hardware layer structure content of the unit-type offset printing press human-machine interface system,completing the hardware selection and calibration work of the human-machine interface system,building the hardware platform for the operation of the human-machine exchange system,customizing the operating system according to the hardware system,proposing the human-machine interface system software scheme based on human-machine interaction requirements,and designing the main page,control parameters,status monitoring,user alarm,and other functional modules of the humanmachine interface system.(3)On the basis of completing the configuration of the Qt development environment,developing the interface startup,interface switching,language switching,soft keyboard,and shared memory function modules of the human-machine interface system,designing and developing the main interface,control parameter interface,manual control interface,alarm interface,monitoring interface,and user management interface.The experiments show that the functionality,real-time performance,and stability of the Qt-based human-machine interface system can meet the requirements of the unit-type offset printing press.