Mold cavity cooling water channel structure combining circulating water channel and spiral water channel

Abstract

The invention discloses a mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel. The mold cavity cooling water channel structure comprises a mold body, a first reinforcing rib and a second reinforcing rib, a forming cavity used for bottle blank forming is formed in the mold body, and the first reinforcing rib and the second reinforcing rib are distributed on the outer wall of the mold body at a certain interval; and the first reinforcing rib surrounds the outer wall of the mold body, the second reinforcing rib spirally surrounds the outer wall of the mold body, the first reinforcing rib and the end of the mold body are distributed at a certain interval to form a first circulation water tank, and the first reinforcing rib and the second reinforcing rib are distributed at a certain interval to form a second circulation water tank. By means of the annular flowing mode of cooling liquid in the first circulation water tank and the second circulation water tank, the cross sections and the flow speeds of the water tanks in a cooling water channel are basically equal, the difference problem of the flow speeds of the cooling liquid in the first water tank of the mold cavity and the flow speeds of the cooling liquid in other follow-up water tanks is solved, and the axial cooling uniformity of the cooling water channel and the circumferential cooling uniformity of the first tank are improved.

Description

technical field [0001] The invention relates to the technical field of mold cavity cooling water channel structure, in particular to a mold cavity cooling water channel structure in which a circulating water channel and a spiral water channel are combined. Background technique [0002] At present, the cavity cooling water channel structure used for fast multi-cavity PET (polyethylene terephthalate) preform molds is generally a spiral water channel. When assembled with the cavity clamping ring, it is necessary for deep cooling In the transition section of the preform, the cross-sectional width of the first water channel of the general cavity channel will be nearly double or more than that of other water channels, which will cause the flow rate of the cooling liquid in the first water channel to be compared with that of the other water channels. The other tanks should be lowered by half or more, which will cause uneven cooling along the axial direction. At the same time, beca...

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Problems solved by technology

[0002] At present, the cavity cooling water channel structure used for fast multi-cavity PET (polyethylene terephthalate) preform molds is generally a spiral water channel. When assembled with the cavity clamping ring, it is necessary for deep cooling In the transition section of the preform, the cross-sectional width of the first water channel of the general cavity channel will be nearly double or more than that of other water channels, which will cause the flow rate of the cooling liquid in the first water channel to be compared with that of the other water channels. The other tanks should be lowered by half or more, which will cause uneven cooling along the axial direction

At the same time, because the transition tank of the spiral water channel is usually an inclined spiral groove, this will cause a section of thicker wall thickness in the first water tank, which will easily cause circumferential cooling of the outer surface temperature of the preform covered by the first water tank area. Uneven situation

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