Movable type steel rail weld joint fine grain smooth shaping machine

The utility model discloses a movable type steel rail weld joint fine grain smooth shaping machine which comprises a fine grain heating mechanism, a vertical straightening mechanism and a transverse straightening and twisting mechanism. The fine grain heating mechanism is used for heating a steel rail welding seam and a heat affected zone part; the vertical straightening mechanism and the transverse straightening and twisting mechanism are used for vertically and transversely shaping a heated welding seam joint; the shape and the structure of the working end face of the transverse straightening and twisting mechanism are matched with those of the side face of the steel rail. According to the scheme, coarse grains in a weld joint and a heat affected zone after steel rail welding are refined, so that the comprehensive mechanical properties such as strength, toughness and hardness of the weld joint are improved; meanwhile, the smoothness of a weld joint is improved; the straightness requirement of the steel rail