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Method and device for reducing axial stress concentration of thermoplastic plastic pipe

An axial stress, plastic pipe technology, applied in the field of thermoplastic pipe production line, to reduce axial stress accumulation, increase production speed, and improve product performance level.

Inactive Publication Date: 2016-02-03
上海天力实业(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method and device for reducing the axial stress concentration of thermoplastic pipes with simple structure, easy adjustment and low manufacturing cost, and solve the problem of how to solve the problem of how to deal with most of the out-of-roundness Single-layer thermoplastic pipes effectively reduce the problem of axial stress accumulation in thermoplastic pipes

Method used

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  • Method and device for reducing axial stress concentration of thermoplastic plastic pipe
  • Method and device for reducing axial stress concentration of thermoplastic plastic pipe
  • Method and device for reducing axial stress concentration of thermoplastic plastic pipe

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Embodiment 1

[0028] The method of reducing the axial stress concentration of thermoplastic pipes is as follows: figure 1 The shown reducing device for axial stress accumulation of thermoplastic pipes reduces the axial stress accumulation of thermoplastic pipe 1, and a set of roller sets 2 composed of 3-6 rollers (in this embodiment, , the roller group 2 is composed of 3 rollers, suitable for pipes with a diameter of 20mm-32mm) radially extruding and deforming the thermoplastic pipe 1, and keeping the temperature of the thermoplastic pipe 1 at 30°C-60°C during deformation (in this implementation In the example, this temperature also has 30 ℃), has suitable elasticity and plasticity, after making thermoplastic pipe 1 carry out radial deformation amount of 2%~5% of this thermoplastic pipe 1 diameter under the action of roller (present embodiment Among them, the amount of radial deformation in the diameter direction of the thermoplastic pipe 1 is 5%), due to the elastic effect of the thermopla...

Embodiment 2

[0041] In this embodiment, the reduction method of the axial stress concentration of the plastic pipe is as follows: figure 1 The shown reducing device for the axial stress accumulation of the plastic pipe reduces the axial stress accumulation of the thermoplastic pipe 1, and a set of 6 rollers 2 uniformly distributed in the circumferential direction of the thermoplastic pipe 1 (this embodiment is suitable for pipes with a diameter of 125 mm or more) The formed roller group performs radial extrusion deformation on the thermoplastic pipe 1, and keeps the temperature of the thermoplastic pipe 1 at 60°C during deformation, and has suitable elasticity and plasticity, so that the thermoplastic pipe 1 can undergo the thermoplastic deformation under the action of the roller 2. After the radial deformation of 2% of the diameter of the plastic pipe 1, due to the elastic effect of the thermoplastic pipe 1, only 0.5% of the radial deformation of the thermoplastic pipe 1 before deformation...

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Abstract

The invention discloses a method for reducing axial stress concentration of a thermoplastic plastic pipe. The method is characterized by comprising the step of performing radial extrusion deformation on the thermoplastic plastic pipe through a roller group formed by 3-6 rollers evenly circumferentially distributed on the thermoplastic plastic pipe, wherein the deformed thermoplastic plastic pipe can still meet the out-of-roundness requirements of the thermoplastic plastic pipe. A device for reducing axial stress concentration of the thermoplastic plastic pipe comprises the roller group formed by the 3-6 rollers, each roller is arranged on a roller support, the roller support is arranged on a flange base, the flange base is provided with a T-shaped groove enabling the roller support to slide in the radial direction of the flange base, and the roller support is connected with the telescopic end of a feeding mechanism. According to the method and the device, the rapidly increased axial stress concentration caused by the increase of production speed can be reduced in an on-line mode, and the axial wall thickness evenness and small out-of-roundness of the pipe can be maintained.

Description

technical field [0001] The invention relates to a method and device for reducing the axial stress accumulation of thermoplastic pipes, and belongs to the technical field of thermoplastic pipe production lines. Background technique [0002] The traditional thermoplastic pipe production line is mainly composed of plastic extruder and its supporting mould, vacuum sizing box, subsequent cooling box, haul-off machine and cutting machine. The haul-off speed of stable production is low and the energy consumption is high. There is still a large margin in the discharge capacity of the main engine. Simply increasing the traction speed will aggravate the lack of axial characteristics of the pipe, which is mainly manifested in the reduction of the hydrostatic strength of the pipe. The damage feature is axial bubbling and cracking. There is a round of uneven axial wall thickness. In order to maintain the high-quality properties of thermoplastic pipes, further increases in production spe...

Claims

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Application Information

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IPC IPC(8): B29C47/90B29C48/90
CPCB29C48/901B29C48/906
Inventor 阮成福郑巍项宁曾勇罗建平陈飞
Owner 上海天力实业(集团)有限公司