PRECISION CONFIRMATION DEVICE FOR CONTACT SYSTEM MEASURING INSTRUMENT OF TUBE INNER DIAMETER

摘要

PROBLEM TO BE SOLVED: To easily confirm precision of a measuring instrument of the inner diameter of a tube which can measure the inner diameter without being affected by color and gloss of the inner surface of the tube and size of the form. ;SOLUTION: An inner diameter measuring sensor device 28 is provided with a first measuring sensor 30 far measuring the position in the vertical direction of an instrument main body 29, a sensor part 32 which is mounted on the tip of a lance 31 to be inserted in a tube and can abut against the inner surface of the tube, an elastic body for energizing a lance pedestal supporting the lance 31 toward the outside of the tube radial direction, and a second measuring sensor for measuring a vertical distance from a reference position in the main body 29 to the sensor part 32. A master piece device 37 is installed which moves a master piece 38 having a reference inner diameter size between a precision confirmation position facing the sensor device 28 and a standby position. A function circuit which measures the inner diameter to the master piece 38 before measuring operation to a tube 12 to be inspected is installed in a control unit.;COPYRIGHT: (C)2000,JPO