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We present a new method for the detection of double-lined spectroscopicbinaries (SB2) using $v\sin{i}$ values from spectral fits. The method is testedon synthetic and real spectra from LAMOST-MRS. It can reliably detect SB2candidates for double-lined binaries with$v\sin{i}_1+v\sin{i}_2<300\,km\,s^{-1}$ if the radial velocity separation islarge enough. Using this method, we detect 2460 SB2 candidates, 1410 of whichare new discoveries. We confirm the correlation between the radial velocityseparation estimated by the binary model and $v\sin{i}_0$ estimated by thesingle star model using the selected sample. Additionally, our method finds onenew SB2 candidate in open cluster M~11.

Detection of 2460 SB2 candidates in the LAMOST-MRS, using projected rotational velocities and a binary spectral model