ribbed reinforced bar characteristic dimension measuring instrument

The utility model relates to a photoelectric projection measuring instrument for real time and online measuring characterized size of ribbed steel bar (thread steel), especially a measuring instrument for the measurement of the characterized size of ribbed steel bar, including 6-14 groups of uniaxial parallel light calipers, a cabinet, high angle stand and low angle stand. The 6-14 groups of uniaxial parallel light calipers are arranged at intervals and interlacement, and divided into two groups in plus-minus 10 degrees~70 degrees inclination to axial direction. The receiving lens and the transmitting lens of the 6-14 groups of uniaxial parallel light calipers are positioned respectively by the low angle stand or high angle stand that arranged on the cabinet. With the special configuration, the utility model has at least the following advantages: the instrument can directly and accurately measure the projection dimension of ribbed steel bar's complete inside diameter and complete external diameter of the upper & lower transverse rib, without the aid of other indirect calculation of the inside diameter, groove rib and external diameter.