Online detection device for residual stress of plate strip of temper mill

The utility model discloses a temper mill plate strip residual stress on-line detection device, which comprises a support plate, a strain rosette, a strain measuring instrument and a rapid punching device, the support plate is supported at the lower part of a detected plate strip and is positioned between two adjacent rollers of a transport roller system, a gap is formed in the support plate, and the strain rosette is positioned in the gap. The strain rosette is pasted on the upper surface of the plate strip, a positioning hole of the strain rosette is located over the gap, the signal output end of the strain rosette is connected with the strain measuring instrument through a cable, a magnetic attraction base is arranged at the bottom of the rapid punching device and attracted to the plate strip, and the magnetic attraction base is connected with the strain measuring instrument through a cable. And a drill bit of the quick punching device is opposite to a positioning hole in the strain rosette. According to t