Rotating Air Fitting for Synthetic Resin Pipe Cooling
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Solution Overview
Problem
Conventional synthetic resin pipes are prone to sagging and degradation due to external temperature changes, and the use of non-easily cooled raw materials like polyethylene reduces productivity and leads to uneven hollow formation, while existing reinforcement methods increase material consumption without significant strength improvement.
Innovation Solution
A synthetic resin pipe manufacturing apparatus that includes an air fitting with a cylindrical shape to support the inner surface of the pipe, an air ejection pipe with perforated holes for cooling, and a rotating mechanism to ensure uniform cooling, along with a coolant system using liquid nitrogen for temperature control, and an ultrasonic inspection unit for quality assurance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional extrusion cooling is used for synthetic resin pipes, then the pipes can be manufactured, but the pipes sag toward the inner diameter and hollows are not properly formed when using non-easily cooled raw materials like polyethylene
Solution Approach 1:
The cooling system is segmented into multiple air fitting units distributed along the extrusion path. Each air fitting unit independently sprays cooling air at specific locations, allowing precise control of cooling zones and preventing sagging while maintaining productivity
Solution Approach 2:
Air fitting units serve as intermediary components that deliver cooling air between the extrusion source and the forming die. These air fittings act as mediators to control the cooling process, enabling proper hollow formation without sacrificing molding speed
2Strength
If reinforcing bars are added to strengthen synthetic resin pipes, then strength is slightly improved, but raw material consumption increases by 20 to 30%
Solution Approach 1:
The invention changes the cooling parameters by introducing controlled air cooling zones with specific temperature gradients. This allows the pipe walls to be properly cooled and strengthened without adding reinforcing bars, reducing raw material consumption while maintaining strength
3Temperature
If the cooling zone for synthetic resin pipe manufacturing is extended, then cooling effectiveness is improved, but the facility length increases
Solution Approach 1:
The cooling system uses movable air fitting units that can be positioned dynamically along the extrusion path. This dynamic positioning allows the cooling zone to be adjusted and optimized without permanently extending the facility length
Solution Approach 2:
Instead of extending the cooling zone only in the longitudinal direction, the invention introduces cooling air from multiple directions using air fittings positioned at different locations. This multi-dimensional cooling approach increases cooling effectiveness without proportionally increasing facility length
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus prevents sagging, maintains pipe thickness, enhances durability, improves production speed, reduces facility length, and allows for high-quality pipe manufacturing with customized cooling and efficient material use.
Implementation Method 1
an air fitting (41) formed in a cylindrical shape having the same inner diameter as the synthetic resin pipe (50) in order to support an inner surface (52) of the synthetic resin pipe (50) that is extruded from the extruder (20) and introduced into a cooler (30a) of a dice (30)
Implementation Method 2
a coolant storage tank (103) provided between two tanks (101, 102) that exchange a refrigerant of liquid nitrogen, cools a coolant to a predetermined temperature through a heat exchange between the refrigerant and the coolant which are exchanged through the inside of the storage tank (103)
Implementation Method 3
an extruder (20) configured to, while slowly rotating a resin supplied from a raw material supply device (10), extrude a synthetic resin pipe (50) through a blow molding portion (21) so that a hollow portion (51) is formed in a spiral shape in a longitudinal direction
Data Source
AI summary
The present disclosure relates to a synthetic resin pipe manufacturing apparatus including: an extruder configured toextrude a synthetic resin pipe through a blow molding portion; an air fitting formed in a cylindrical shape having the same inner diameter as the synthetic resin pipe and formed in front of an air supply pipe, which is formed inside the extruder; an air discharge plate disposed in front of the air ejection pipe and having a plurality of air discharge holes perforated in a disc to discharge hot air, generated as air ejected through the air holes cools the inner surface of the synthetic resin pipe, to the outside; the air supply pipe disposed behind the air fitting and having a plurality of air holes perforated therein; and a rotation driver configured to transmit rotation power to the air supply pipe.