Pipe production pressure stabilizing device

Abstract

A pipe production pressure stabilizing device comprises a distributing device (5), supports (3), an opening mold (8), a core bar (6) and an air guiding pipe (2). The distributing device (5) is fixed to the supports (3) which are each provided with an air inlet (4), and the air guiding pipe (2) is also fixed to the supports (3); one end of the air guiding pipe (2) is communicated with the corresponding air inlet (4), and the other end of the air guiding pipe (2) is communicated with a central through hole (7) in the core bar (6); the end, away from the air guiding pipe (2), of the central through hole (7) is connected with a conical buffering pipe (71) which is connected with a buffering area (72); the buffering area (72) is a circular pipe, and the inner diameter of the circular pipe is not larger than the inner diameter of the opening mold (8). By arranging the buffering pipe and the buffering area, in inflation, airflow is gradually slowed down at the buffering pipe and tends to be stable at the buffering pipe, air pressure at the two ends of a pipe is made more stable, and therefore the rate of finished products is increased; the rejection ratio of pipes is also reduced, and the production cost is lowered.

Description

technical field [0001] The invention relates to a pressure stabilizing device for pipe fitting production, in particular to a voltage stabilizing device with very uniform pressure at both ends of the pipe fitting. Background technique [0002] Internal pressure sizing is one of the main methods of pipe forming at present, and it is mainly used to produce large diameter pipes. Internal pressure sizing is to fill the inside of the pipe with compressed air, so that the outer wall of the pipe is attached to the inner surface of the sizing sleeve under the action of the gas to cool and form. However, at both ends of the pipe fittings, due to the airflow generated by the air intake pipe maintaining the pressure when the air is sucked in, a local negative pressure is formed near the end of the pipe fitting near the die, resulting in roughness on the inner wall of the pipe, or the outer surface Unsmooth and other issues. Contents of the invention [0003] Aiming at the above-men...

AI Technical Summary

Problems solved by technology

However, at both ends of the pipe fittings, due to the airflow generated by the air intake pipe maintaining the pressure when the air is sucked in, a local negative pressure is formed near the end of the pipe fitting near the die, resulting in roughness on the inner wall of the pipe, or the outer surface Not smooth and other issues

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