The utility model discloses a mould semi-annular waterway structure, which comprises a lower mould, the lower mould comprises a
lower half part and an upper half part, two symmetrically arranged waterway mechanisms are arranged in the lower mould, each waterway mechanism comprises a first semi-annular groove arranged at the top of the upper half part, a second semi-annular groove is arranged at the bottom of the first semi-annular groove, and the second semi-annular groove is arranged at the top of the
lower half part. And the lower end of the second semi-annular groove penetrates into the
lower half part, and a hollow semi-annular
pipe is inserted into the second semi-annular groove. According to the semi-annular water path structure of the mold, the two symmetrically-arranged water path mechanisms are arranged, the water inlet directions of the two water path mechanisms are opposite, heat absorption of cooling water can be uniform, then heat dissipation of the lower mold is more uniform, meanwhile, water enters and exits from the two opposite water path mechanisms at the same time, the heat dissipation efficiency of the lower mold is improved, and a self-made
machining mode is adopted; the cooling device is simple in structure, easy to control in delivery time, low in cost, large in waterway channel and not prone to blockage due to the fact that the number of the plugs is four, and the cooling and heat dissipation efficiency and effect are guaranteed.