Pipe inner diameter measurement auxiliary device

The utility model relates to an auxiliary device for measuring the inner diameter of a pipe. The device comprises a foundation base, a central disc, a vertical supporting rod and a horizontal slidingblock, a vertical supporting rod is installed on the foundation base. A central disc and a vertical sliding block are mounted on the vertical supporting rod; a plurality of circular holes are uniformly formed in the foundation base; a positioning pin is connected to the lower end face of the center disc and matched with the round hole, a marking pen is connected to the vertical sliding block through a telescopic rod, three supporting legs are evenly distributed and installed on the outer circle of the foundation base, and the included angle between every two adjacent supporting legs is 120 degrees. The pipe marking device has the advantages of being simple in structure, convenient to use, rapid and accurate in marking and suitable for pipes of different sizes. 本实用新型涉及了一种管材内径测量辅助装置，包括基础底座、中心圆盘、垂直支撑杆和水平滑块，在所述基础底座上安装