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Hole opening structure on large-diameter thick-wall container shell and hole opening method

A technology of thick-walled containers and open-hole structures, applied in the direction of reducing greenhouse gases, manufacturing tools, and edge parts of workpieces, etc., can solve the problems of large processing area inside the shell, large non-destructive testing area, and large welding workload, etc., to achieve Reduce the workload of surfacing welding and non-destructive testing area, improve the welding quality and the effect of simple structure

Active Publication Date: 2017-08-18
广州广重企业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When this type of structure is used to weld the connecting pipe, because the tapered hole is longer, the cutting area inside the shell is too large due to the opening of the hole.
When welding the pipe, the removed part needs to be supplemented with surfacing welding, which leads to a very heavy workload of welding
When welding the connecting pipe, welding defects are likely to occur in the supplementary area of ​​surfacing welding, and the area of ​​non-destructive testing after surfacing welding is large, and the connecting pipe is easily deformed during welding

Method used

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  • Hole opening structure on large-diameter thick-wall container shell and hole opening method
  • Hole opening structure on large-diameter thick-wall container shell and hole opening method
  • Hole opening structure on large-diameter thick-wall container shell and hole opening method

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Experimental program
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Effect test

Embodiment 1

[0032] like figure 1 , 2 , The opening structure shown in 3 and 4 on the shell of the large-diameter thick-walled container, the opening structure is an annular opening structure; Hole 2 and the third straight hole 3. The length of the first straight hole 1 is at least 2mm. The first straight hole 1 communicates with the outside of the housing 4 . The two ends of the second tapered hole 2 are respectively a big end and a small end, the small end is connected to the first straight hole 1 , and the big end is connected to the third straight hole 3 . The third straight hole 3 communicates with the inside of the casing 4 . The angle β between the generatrix of the second section of the tapered hole 2 and the vertical is 45°. The hole depth of the first straight hole 1 is at least 2mm.

[0033] Calculate the busbar length by:

[0034] According to the opening diameter d of the welding hole, the inner radius r of the shell, and the outer radius R of the shell, the angle of th...

Embodiment 2

[0039] In Embodiment 1, the angle β between the generatrix of the second segment of the tapered hole 2 and the vertical line is replaced with 50° from 45°. The calculated length of the tapered hole generatrix is ​​(R *cosα-(r+2)) / cos50°. The three-segment opening is then machined by boring.

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Abstract

The invention relates to the design and manufacture field of boiler pressure containers, in particular to a hole opening structure on a large-diameter thick-wall container shell and a hole opening method thereof. The hole opening structure on the large-diameter thick-wall container shell is divided into three sections and comprises a first section of straight hole, a second section of optimally designed taper hole and a third section of straight hole which are sequentially connected; the first section of straight hole communicates with the exterior of the shell; the second section of taper hole extends toward the periphery of the first section of straight hole at an appropriate angle; and the third section of straight hole communicates with the interior of the shell. The invention aims to provide a hole opening structure design on the large-diameter thick-wall container shell, so that the cutting processing capacity on an inner wall of the shell during hole opening is reduced, the welding workload and a nondestructive testing area are greatly reduced, meanwhile, the possibility of welding defect generation is correspondingly reduced, and the welding deformation is reduced.

Description

technical field [0001] The invention relates to the field of boiler pressure vessel manufacture, in particular to the design of the opening structure and the opening method of the shell of the large-diameter thick-walled vessel. Background technique [0002] With the advancement of technology and the application of new materials and new processes, the operating conditions of boiler and pressure vessel products tend to use higher parameters, the design pressure and design temperature are getting higher and higher, and the diameter of the equipment is also getting larger, resulting in the vessel ( The shell of the steam drum is also thickened accordingly. Large-diameter thick-walled containers, such as steam drums, are always welded with connecting pipes connecting the inside of the container with the external pipeline. All connecting pipes realize the communication function by opening holes in the container shell and welding to the shell. [0003] At present, a two-stage ope...

Claims

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Application Information

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IPC IPC(8): B23K33/00B23B35/00
CPCB23B35/00B23K33/00Y02E30/30
Inventor 马险峰林永健余乐梁政杰
Owner 广州广重企业集团有限公司
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