VIBRATION TEST UNIT FOR PIPE AND PRESSURE-VIBRATION TEST APPARATUS

摘要

A pressure excitation test device for pipes improves the reliability of the brazing joint part by accurately evaluating the leakage lifetime of brazing copper pipes, and applies various vibration conditions to the copper pipes by using the drive cam ascended and descended by a certain width in case of applying the stress condition by vibration. A pressure excitation test device for pipes comprises a pressure supply unit supplying constant pressure gas into a pipe(10) such as the brazing copper pipe; a vibration test unit(200) applying a certain vibration to the pipe; and a main control unit(300) which determines the lifetime of the pipe in case the inner pressure value of the pipe deviates from the set standard pressure value. The vibration test unit comprises a supporting part which includes a fixing plate, a supporting plate and a hinge end and supports both ends of the pipe; a pair of grippers gripping two points of the pipe; a fixing unit connected through the bottom of the grippers and a bearing; a loose axle whose one end is fixed to the central part of the fixing unit and the other end is extended toward the lower side of the pipe so as to be located between the grippers; a drive cam which raises the loose axle by a certain height by contacting with the other end of the loose axle; and a driving part(260) axially connected to the drive cam to rotate the drive cam.