Nesting device used in nesting process for high-vacuum multilayer heat-insulating LNG tank for ship

Abstract

The invention discloses a nesting device used in a nesting process for a highly-vacuum multilayer heat-insulating LNG tank for a ship and relates to the field of manufacturing the highly-vacuum multilayer heat-insulating LNG tank for the ship. The nesting device comprises a self-powered tractor which comprises a chassis, two traveling speed reducers, two traveling motors, a flange half shaft, a coupler and a rotating motor, two driving wheels and two driven wheels are mounted on the lower portion of the chassis, a shaft of each driving wheel is connected with an output shaft of one traveling speed reducer, and an input shaft of each traveling speed reducer is connected with one traveling motor. The tractor can draw an inner container to be in horizontal linear motion on a rail, so that nesting and horizontal axial positioning of the inner container and an outer shell are facilitated; the tractor also can drive the inner container to rotate, so that peripheral positioning of the inner container and the outer shell can be assisted during nesting; the nesting device is continuous and stable in operation in the process of nesting, scratching risk is avoided, and low-temperature performance of the highly-vacuum multilayer heat-insulating LNG tank which is produced finally is unaffected.

Description

technical field [0001] The invention relates to the manufacturing field of marine high-vacuum multi-layer heat-insulated LNG gas tanks, in particular to a fitting device used in the fitting process of marine high-vacuum multi-layer heat-insulated LNG gas tanks. Background technique [0002] According to the existing norms and standards, the current marine LNG (Liquefied Natural Gas, liquefied natural gas) tanks generally adopt double-layer stainless steel horizontal storage tanks, including the outer shell and the inner tank. After the inner tank is qualified after inspection, the inner tank is set in the outer shell , and then install the two ends of the head, the interlayer space between the shell and the liner is closed, and finally the interlayer space is evacuated. In the whole manufacturing process, fitting is a difficult part of construction, which has a direct impact on product quality. [0003] At present, the fitting process of various manufacturers of marine LNG ...

AI Technical Summary

Problems solved by technology

Since the crane 7 is starting and running, the inclination angle of the suspender 8 will change, causing the height of the lifting point to change, causing the central axis of the inner tank 6 to change and deviate from the central axis of the outer shell 2; due to the inner tank 6 and The distance between the shells 2 is very small, less than 20 mm. If the deviation of the central axes of the two is slightly larger, the heat insulating material on the outer surface of the inner tank 6 will be scratched and damaged; The distance between them is too small, and the production operators and quality managers cannot accurately observe and evaluate the damage degree of the heat insulation material on the surface of the inner tank 6

If the thermal insulation material on the surface of the inner liner 6 is damaged but not detected and treated, the low-temperature performance of the final high-vacuum multi-layer thermal insulation LNG gas tank produced will be affected, and may even be unqualified

[0006] (2) As mentioned above, in order to avoid the scratching of the heat insulation material on the surface of the inner tank 6, the production operator and the crane 7 need to cooperate tacitly, and the production operator needs to stop the operation constantly and check the inner tank 6 and the The central axis of the shell 2 is constantly adjusted, which directly leads to a great reduction in production efficiency, and the product quality is determined by human factors such as the experience of the production operator. The product quality is unstable and is not conducive to quantitative control.

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