Online sampler and valve core falling-off extraction tool

An online sampler and valve core falling-off extraction tool belongs to the field of extraction devices and comprises a supporting barrel and a flange, wherein the flange is welded at the bottom end of the supporting barrel and provided with four fixing holes; a hold down nut with a central hole is connected onto the upper end of the supporting barrel; an extraction screw is arranged in the central hole of the hold down nut; a movable nut is arranged at the upper part of the extraction screw and positioned outside the hold down nut; and a gasket and a connecting piece are arranged at the bottom of the extraction screw and in the supporting barrel. According to the utility model, the structural design is reasonable, and the conception is skillful and novel; the supporting barrel is fixed on an emergency valve through the flange, so that mounting and dismantling are facilitated, the use is convenient, the working efficiency of the working staff is improved, the phenomenon of lockout caused by falling off of the