On-line detection device for projection welding nut of sheet metal part

The utility model relates to a sheet metal part projection welding nut on-line detection device, which comprises a base, a driving mechanism, a mounting block, a first detection assembly, a first proximity switch and a first support frame, the driving mechanism is mechanically connected with the base to realize the installation and fixation of the driving mechanism, and the mounting block is in driving connection with the driving mechanism. The first detection assembly and the first proximity switch are mechanically connected with the mounting block through the first supporting frame and used for achieving synchronous movement with the mounting block. The first detection assembly comprises a positioning block, a detection pin, an induction support and a spring, the induction support is mechanically connected with the detection pin, the position of the first proximity switch is opposite to the position of the induction support so that position detection of the induction support can be achieved, and the detecti