Abstract: To address the issue of uneven refrigerator door heights, a novel adjustable hinge model has been developed, enabling height adjustment to maintain door alignment. The study focuses on the overall design concept of the adjustable hinge, control of key risk points, and solutions to problems encountered during experiments. Simulation analysis and experiments were conducted from both the whole machine and individual component perspectives, verifying the reliability and practicality of the adjustable hinge, which surpasses conventional hinges. Regarding the risk of thread loosening in the adjustable hinge, theoretical calculations and experiments demonstrated that adding a fastening set screw eliminates the risk of loosening under actual working conditions. In response to issues such as salt spray corrosion and motion interference observed during experiments, the structure of the adjustment shaft was optimized, and materials were carefully selected. The optimal thread tolerance and grade were chosen based on practical operation convenience and reliability. Through the presented analysis and research, it has been demonstrated that the adjustable hinge not only retains all functionalities of conventional hinges, but also incorporates an adjustment capability, representing a technologically upgraded hinge model. This innovation provides a novel solution for effectively addressing refrigerator door misalignment issues, offering both theoretical guidance and practical methodology for appliance manufacturing optimization.

Key words: Hinge, Refrigerator, Height adjustment, Simulation analysis