| 摘要 |
PURPOSE: An apparatus for measuring an inner diameter of a large steel pipe is provided to prevent water pipes from being broken or damaged by precisely measuring deformation of the water pipes. CONSTITUTION: An inner diameter measuring apparatus for a large steel pipe includes a main pipe(10) formed at one side thereof with a transparent window, a ball screw shaft(20), which is spline-coupled to the main pipe(10), a ball screw nut(30) rotatably coupled to the ball screw shaft(20), and a support shaft(40) rotatably coupled to a lower end of the main pipe(10). The main pipe(10) receives the ball screw shaft(20) therein. A notch mark is formed in the ball screw shaft(20). The main pipe(10) is provided with a guide protrusion in an axial direction thereof. A plane is formed at an outer peripheral surface of the ball screw shaft(20).
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