High-precision superposition technology of shrink fit cylinder for pressure container

Abstract

The invention discloses a high-precision superposition technology of a shrink fit cylinder for a pressure container. The high-precision superposition technology comprises manufacturing an outer cylinder, manufacturing a lining cylinder and shrink fit, wherein the shrink fit comprises the followings: A, positioning and pre-assembling: adopting a lining hoisting tool to hoist and fix the lining cylinder, pre-assembling the lining cylinder and the outer cylinder on a base tool, and marking the best shrink fit station; B, heating: heating the outer cylinder and the base tool until the internal diameter swelling capacity D reaching (0.4-0.6)% of the outer cylinder; C, superposition: moving a flat car to the marked part in the step A, slowly and perpendicularly putting down the lining cylinder,and carrying out natural cooling; and D, checking the indicator to meet the requirement of the related standard. According to the high-precision superposition technology, the base tool and the lininghoisting tool are matched for application, so that shrink fit of the outer cylinder and the lining cylinder can be rapidly and precisely carried out; the application range of the technology is wide; and in addition, the metallographic structure and the performance of the material of the outer cylinder are not damaged, the entire operating process is simple, convenient and fast, the manufactured shrink fit cylinder is stable in quality and reduced in rejection rate.

Description

technical field [0001] The invention belongs to the technical field of pressure vessel manufacturing technology, and in particular relates to a high-precision fitting process of a heat sleeve body for a pressure vessel. Background technique [0002] With the continuous advancement of pressure vessel manufacturing technology, the shrink-fit cylinder structure has been successfully applied in synthesis towers, hydrogenation reactors, ammonia separators, urea, etc. For various pressure vessels such as synthetic towers, despite this, most manufacturing companies dare not easily try to make the thermal sleeve body, because the quality of the thermal sleeve body produced does not meet the relevant regulations, which not only delays the construction period, It also wastes consumables and energy, and some are even scrapped directly; comprehensively, the main factors affecting the quality of the thermal sleeve body are: the control of various indicators such as the interference, roun...

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Problems solved by technology

[0002] With the continuous advancement of pressure vessel manufacturing technology, the shrink-fit cylinder structure has been successfully applied in synthesis towers, hydrogenation reactors, ammonia separators, urea, etc. For various pressure vessels such as synthetic towers, despite this, most manufacturing companies dare not easily try to make the thermal sleeve body, because the quality of the thermal sleeve body produced does not meet the relevant regulations, which not only delays the construction period, It also wastes consumables and energy, and some are even scrapped directly; comprehensively, the main factors affecting the quality of the thermal sleeve body are: the control of various indicators such as the interference, roundness, and straightness of the inner and outer sleeves during the production process Improper; poor precision control during fitting, resulting in the quality of the fit surface of the thermal sleeve body not meeting the relevant standards, and serious deformation of the inner cylinder section; at the same time, the traditional thermal sleeve body needs to be correspondingly improved during the production of the outer cylinder The thermal sleeve temperature of the section will damage or change the metallographic structure and properties of the material of the outer cylinder section, thus affecting the quality of the entire thermal sleeve body

In addition, some equipment in chemical production adopts surfacing welding lining, which obviously cannot meet the working requirements of the equipment, and has to adopt the method of thermal sleeve lining. The thickness of the lining layer is generally 8-12mm, which is thicker than the general thermal sleeve joint. The thinner it is, the more cautious it needs to be in the operation of the heat sleeve, and the more difficult it is to control the precision

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