The emergence of uncertainty factors will exert a strong influence on the accuracy of workshop scheduling. Digital twin' technology and planning and scheduling are integrated to form a planning and scheduling system based on digital twin, which can effectively use the concept of twin to carry out all-around management and control of the uncertain factors in production activities so that the planning and scheduling scheme in the production process can accurately guide the actual production. Firstly, the system establishes management and control mechanism of planning and scheduling system based on digital twin. Second, it establishes a digital twin model of the planning and scheduling system for the management and control mechanism. Finally, the key technology of the planning and scheduling system is expounded, which mainly includes the perception and collection of total production factor information and the planning and scheduling prediction. In order to verify the validity of the scheme, the planning and scheduling system suited for the enterprise is designed and developed in combination with the frame workshop.

Existing scheduling systems cannot respond quickly and efficiently to the appearance of uncertain variable interference factors in the scheduling process. The efficiency of the enterprise is hence seriously affected by these factors. The concept of the digital twin provides new research directions for scheduling systems. In order to improve the overall performance of the production scheduling system in a frame shop, virtual-real fusion technology utilizing the digital twin is first introduced to integrate the information and logistics flows in the scheduling process as part of the manufacturing execution system-based production scheduling mechanism. The balance optimization of the mixed-flow production line is then carried out, and the mixed-flow production line balance and sequencing models are established. A scheduling system for the frame shop combining various system functions is finally designed based on the sequencing model and production status. The scheduling system comprehensively considers the two uncertain factors of materials and orders to generate scheduling information through an intelligent scheduling mode while realizing real-time synergy between the information and logistics flows. The system has achieved excellent implementation results in the frame shop and provides a reference for the application of digital twins in production workshops.