Device and method for on-line diameter expansion of plastic pipes

A plastic pipe, plastic pipe technology, applied in the direction of tubular goods, applications, household appliances, etc., can solve the problems of difficult control of production process, limited speed improvement, low heating efficiency, etc., to achieve operational stability and quality control, and ensure expansion. Diameter and heat shrinkage, simple design effect

Active Publication Date: 2009-11-11
GUANGDONG LIANSU TECH INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the special design of the equipment used, it is relatively complicated
And it needs to use water bath oil bath heating, etc., the heating efficiency is low, which limits the improvement of its speed
[0005] Moreover, the diameter expansion of the prior art requires heating (such as hot air or oil bath heating), which consumes a lot of energy, has complicated equipment structure, and the production process is difficult to control and the cost is high.

Method used

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  • Device and method for on-line diameter expansion of plastic pipes
  • Device and method for on-line diameter expansion of plastic pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1. Take the variable diameter of PVC-U pipe Φ15 (outer diameter)×1.5mm (wall thickness) as an example to Φ20×1.4mm, wherein the inner diameter of cooling water jacket 1 is Φ15, and the inner diameter of vacuum calibrating sleeve 2 is Φ20. The production process is as follows:

[0036] Temperature measuring point pipe surface temperature

Embodiment 2

[0037] Embodiment 2: PE pipe Φ50 (outer diameter) × 2 mm (wall thickness) is reduced in diameter to Φ55 × 1.8 mm, wherein the inner diameter of the cooling water jacket 1 is Φ50, and the inner diameter of the vacuum setting (expanding) sleeve is Φ55. The production process is as follows:

[0038] Temperature measuring point pipe surface temperature

[0039] .

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Abstract

The invention provides a device and a method for on-line diameter expansion of plastic pipes. The device consists of a cooling water jacket (1), a vacuum sizing sleeve (2) and a cooling vacuum box (3), wherein the vacuum sizing sleeve (2) is arranged at the front end inside the cooling vacuum box (3), and the cooling water jacket (1) is arranged at the front end outside the cooling vacuum box (3). The device of the invention is used in conjunction with pipeline production equipment, cools pipelines immediately after extrusion molding through the cooling water jacket, and then directly expands diameter through the cooling vacuum box and the vacuum sizing sleeve arranged inside the cooling vacuum box, thereby changing a two-time sizing method which needs reheating in the prior art and enabling the plastic pipes to change size and have the memory function of heat shrinkage.

Description

technical field [0001] The invention belongs to the field of on-line processing of plastic pipes, and in particular relates to an online diameter-expanding device and method capable of producing plastic pipes with built-in memory retraction functions. technical background [0002] At present, domestic pipeline expansion processing mainly focuses on the production and development of heat shrinkable tubes. [0003] There is a method of hot charging for diameter expansion. For example, the Chinese patent application number is 200410010901.5 thermal shrinkage inflation continuous expansion method and expansion device. This type of method has high requirements on the quality of hot air, otherwise water vapor condensation will easily occur, resulting in a drop in inflation pressure and a greatly reduced expansion effect. Moreover, the pressure and temperature of the heat-shrinking air are difficult to control, which also brings uncertainties to continuous production. [0004] A...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B29C47/90B29C47/92B29K27/06B29K23/00B29L23/00B29C48/90B29C48/92
CPCB29C48/09B29C48/92B29C2948/92209B29C2948/92428B29C2948/92704B29C2948/92923
Inventor文巍伟
OwnerGUANGDONG LIANSU TECH INDAL