Refrigeration and cold storage device with gravity type cold charging function

The invention discloses a gravity type cold charging refrigeration and cold storage device, and relates to the field of cold-chain logistics equipment. The device comprises a box body, a heat exchanger and a cold storage agent are arranged in the box body, and the density of the cold storage agent is increased along with reduction of the temperature. The heat exchanger comprises two collecting pipes, and a heat exchange branch pipe is arranged between the two collecting pipes. First connecting pipes are arranged on the left side and the right side of the exterior of the box body respectively, a second connecting pipe is arranged on the collecting pipe, and the first connecting pipe and the second connecting pipe located on the same side are connected through a traction pipe. A first pulley is arranged on the upper side face of the box body and located below the traction pipe, and a second pulley is arranged between the first pulley and the first connecting pipe which are located on the same side. And a tensio