The utility model relates to an automatic line of lock tube wheel hub cover product is with preventing turning over subassembly, it include the glide slope, correspond set up in the conveyer of glide slope below and adjustable the installation the glide slope lower extreme just extends to conveyer top shelter from the mechanism. Through the mechanism of sheltering from that can adjust in the installation of glide slope lower extreme to make it can extend to conveyer top, make its interval with conveyer unanimous with product height, can ensure like this that lock tube wheel hub cover class product does not roll realization automated production in transportation process.