Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for forming large-diameter bellows expansion joints

A forming method and corrugated pipe technology, which is applied to expansion compensation devices for pipelines, pipe elements, pipes/pipe joints/pipe fittings, etc., can solve problems such as bellows scratches, and achieve scratch prevention, weld quality and Good appearance, easy installation and transportation

Active Publication Date: 2022-06-17
NANJING DUBLE METAL EQUIP ENG +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickest roll forming equipment in China can only be formed to 6mm at the thickest, and the forming wheel contacts the bellows at one point during rolling, and acts repeatedly on different circumferential lines, and the surface of the bellows is prone to scratches

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for forming large-diameter bellows expansion joints
  • A method for forming large-diameter bellows expansion joints
  • A method for forming large-diameter bellows expansion joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings:

[0027] like figure 1 As shown, the present invention discloses a method for forming a large-diameter bellows expansion joint, comprising the following steps:

[0028] Step 1, the rolling of the corrugated pipe, because the diameter of the trial production corrugated pipe is 15 meters, the diameter of the large-diameter corrugated pipe is larger, the length of the plate determines that the direct rolling cannot be realized, and it needs to be rolled in sections, and the steel plate is rolled in a three-roller coil. It is carried out on the plate machine. When rolling, first of all, pay attention to the alignment of the steel plate when it enters the plate bending machine to prevent it from being rolled into an ellipse. Before rolling, clean up the dust and oxide scale on the plate bending machine in time to prevent the repeated rolling process. The surface of the base ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for forming a large-diameter corrugated pipe expansion joint, which includes rolling the corrugated pipe, correcting the circle of the corrugated pipe, preparing before rolling, and forming by rolling. The large-diameter bellows expansion joint forming method of the present invention can form the bellows at the construction site, which can reduce costs and save freight. During the forming process, the forming wheel of the driving shaft of the rolling equipment is coated with nylon to reduce Contact with the steel to prevent scratches on the surface of the bellows, and check the forming wheel once a week during the forming process to see if the nylon has fallen off. Reduce thinning.

Description

technical field [0001] The invention relates to a method for forming a large-diameter bellows expansion joint, and belongs to the technical field of bellows expansion joint forming. Background technique [0002] There are four types of common forming processes for corrugated pipes. The domestic solutions used in the manufacture of large-diameter corrugated pipes mainly include hydroforming and roll forming. [0003] At present, the bellows with the same diameter as the large-diameter bellows has not been manufactured by the hydroforming process in China. It is difficult to manufacture hydroforming equipment. There is no precedent for this hydraulic equipment in China. The sealing performance of large-diameter bellows is also not easy to control, resulting in difficulty in forming bellows. [0004] Bulging forming uses the die to force the thickness of the sheet to be thinned and the surface area to be increased to obtain the stamping method of the geometric shape of the par...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B21D13/04B21D21/00F16L51/02B23P15/00
CPCB21D13/04B21D21/00F16L51/02B23P15/00
Inventor 孙尧裴永青康华宁唐卫华吴小玲
Owner NANJING DUBLE METAL EQUIP ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com