【摘要】 通风管三通焊接前需要切割相贯线处的坡口，焊缝坡口的准备对后续焊接工作至关重要。同时，还设计了以液压传动及其控制系统为核心的通风管三通相贯线处焊接坡口自动切割机。其具有钢管夹紧力可控，快、慢速运动有效结合，提高了生产效率，保证了坡口切割质量，改善了工人劳动条件。液压传动及其控制系统的应用为钢管自动切割提供了必要条件，方案合理可行，机构简单紧凑，将具有广阔的应用前景。更多还原

【Abstract】 The groove needs to be cut at the intersecting line before air duct tees are welded, and the preparation of weld grooves is very important for the subsequent welding process. This paper designs an automatic cutting machine for welding grooves at the intersecting line of air duct teens with hydraulic transmission and its control system as the core. It has the characteristics of the controllable clamp force of steel tubes, and the effective combination of high-speed and low-speed motion, which improves production efficiency, assures the cutting quality of grooves,and improves the working conditions of workers. The application of hydraulic transmission and its control system provides a necessary condition for the automatic cutting of steel tubes, the project is reasonable and feasible, and the mechanism is simple and compact. It will have a broad application prospect.更多还原