Improved liquid nitrogen fumigation frame for fine tube freezing and refining

The invention discloses an improved liquid nitrogen fumigation frame for tubule freezing refining, which comprises a rectangular frame, four supporting legs and two carrying plates, the four supporting legs are movably mounted at four corners of the rectangular frame respectively and can be subjected to lifting adjustment, and a pair of inverted L-shaped frames is symmetrically mounted on each of two sides of the top of the rectangular frame. Lifting adjusting pieces are installed on the back-to-back sides of each pair of inverted-L-shaped frames, the lower portions of the four lifting adjusting pieces are connected with the four supporting legs correspondingly, two inverted-L-shaped fixing plates are symmetrically and fixedly installed on the top of the rectangular frame, and telescopic adjusting pieces are installed in the middles of the two inverted-L-shaped fixing plates correspondingly; the two carrying plates are installed on the opposite sides of the two telescopic adjusting pieces correspondingly, and