Device for detecting straightness of spliced circular tube

The invention discloses a spliced circular tube straightness detection device, which comprises a calibration device and a centering device which are oppositely arranged, and a measurement device positioned between the calibration device and the centering device, and is characterized in that the calibration device comprises a frame body, and a pair of guide rails I, an adjusting lead screw I and a panel are fixed on one surface, directly facing the centering device, of the frame body; three groups of targets I with unequal horizontal spacing and equal center height are symmetrically arranged on the panel along a vertical center line; the centering device comprises a cylindrical support, a pair of guide rails II, an adjusting lead screw II and a V-shaped panel are fixedly connected to the cambered surface of the cylindrical support, clamping arms are fixedly connected to the side edges of the two wings of the V-shaped panel, and handheld lasers are installed on the clamping arms; the measuring device comprises