The construction process of large-scale road maintenance machinery is interlocking, and it is more necessary to accurately calculate the card control at the time point. The construction of large-scale road maintenance machinery is a professional team for line maintenance, which undertakes long-term tamping, construction and flaw detection of lines and turnouts. The trilogy of mechanical construction procedure refers to the interlocking construction procedure of large-scale road maintenance machinery, and the card control should be accurately calculated at the time point. Large-scale road maintenance machinery mainly refers to the mechanical equipment for maintaining, repairing and refurbishing railway lines, including equipment such as ballast screening, ballast tamping and compaction, ballast vibration stability and ballast shaping.