A heating device for a spherical shell

Abstract

The invention discloses a heating device for a spherical shell, the heating device comprises an inner heater, which is used to heat the annular welding seam on the spherical shell from the inside; and an outer heater, which is used to heat the spherical shell from the outside. The annular weld on the body is heated; the insulation protection assembly includes a first electrode, a first connection wire, a second connection wire, a support and a first insulation flange; the inner heater and the outer heater are modularized design , a plurality of inner heating modules are spliced ​​with each other to form an inner cylinder that is compatible with the outer and inner surface of the annular weld and has upper and lower openings, and a plurality of outer heating modules are spliced ​​with each other to form an inner cylinder that is compatible with the outer surface of the annular weld. The outer cylinder with upper and lower openings. The heating device provided by the present invention can simultaneously heat up the annular welding seam from the inside and outside of the spherical shell, thereby avoiding the generation of a large temperature gradient due to the large thickness of the spherical shell when the spherical shell is welded. Problems affecting welding quality.

Description

technical field [0001] The present invention relates to the technical field of industrial equipment, and more specifically, to a heating device for a spherical shell. Background technique [0002] The high-pressure spherical shell is usually formed by welding two hemispheres through a circular weld. Because of the structural load-bearing requirements of the high-pressure spherical shell, it is necessary to use special materials with large thickness and high strength, such as Ti80. [0003] When welding a shell with a large thickness and high strength, it is usually necessary to preheat the shell to avoid cracks caused by uneven cooling and heating of the inner and outer walls of the shell, thereby affecting the structural strength. Traditional preheating methods use gas torches, heating furnaces, induction heating, infrared radiation heating, etc., but the above methods are suitable for workpieces with relatively thin thickness and relatively small overall size. Therefore, ...

AI Technical Summary

Problems solved by technology

[0004] 1) It is easy to cause uneven heating and cooling of the inner and outer walls and cause cracks, thus affecting the structural strength;

[0005] 2) The shape of the shell is not easy to fix, and the thickness is large so that it is easy to generate a large temperature gradient, which will cause thermal stress, solidification shrinkage force and tissue stress, resulting in welding deformation and cracks;

[0006] 3) The cables inside the shell are prone to problems such as discharge breakdown due to rotating winding

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