Manufacturing method and system of polyurethane insulation box for liquefied natural gas ship

Abstract

The invention relates to a manufacturing method and system of a polyurethane insulation box for a liquefied natural gas ship. The manufacturing method includes a gluing and assembling stage, a leveling and output stage, a CNC machining stage and a packaging stage, wherein the gluing and assembling stage comprises a universal gluing and assembling process, a press-fitting process and an aging process; the manufacturing system comprises a universal gluing and assembling area, a MARK III secondary gluing and assembling area, a press-fitting area, an aging area, a leveling and output area, a CNC machining area and a packaging area. Compared with the prior art, the advantage of high efficiency of automatic equipment is utilized, function blocks are set according to properties of machining processes, all stations in the blocks are connected through an automatic logistics conveying line, all the blocks are connected through an intelligent conveying system, and thus the system can operate continuously, efficiently and orderly, the functions of the blocks can be exerted to the maximum extent, the influence of failures of single equipment on the whole production system is lowered, productionefficiency is improved, the production hours are shortened, and the high-precision quality requirement of products is met.

Description

technical field [0001] The invention belongs to the technical field of liquefied natural gas ships, and relates to a manufacturing method and a manufacturing system of a polyurethane insulating box for a liquefied natural gas ship. Background technique [0002] Among the currently applied liquid cargo containment systems of large liquefied natural gas (LNG) ships, membrane-type LNG ships account for more than 80%. Membrane-type cargo tanks are developed by French GTT company. Typical membrane-type cargo tank forms include NO.96 containment system and Mark III containment system. The insulation box is an important part to ensure the ultra-low temperature of -163°C in the liquid cargo tank of the LNG ship. The original insulation box is composed of expanded perlite or glass wool filled in the plywood box. [0003] The reinforced polyurethane standard insulation box is an improved form of the original expanded perlite or glass wool filled insulation box. It is composed of rigi...

AI Technical Summary

Problems solved by technology

The existing manufacturing method is that after the plywood or polyurethane foam board is automatically glued, the off-line method is adopted, and the manual or semi-automatic spreader is stacked layer by layer and placed on the corresponding assembly table for assembly, and it is inevitable that there will be misalignment between layers.

For the L03 / L03+ series insulation box, the four sides of the wooden plywood (Cleat) must be glued to the polyurethane and the plywood. The assembly is all manual, and the fixation after the glue is mostly manually fastened with rubber belts. The method is used for subsequent aging curing, resulting in uneven stress on the splint, and the connection strength and assembly accuracy are not up to standard

[0008] (2) The flexibility of the process is poor

The prior art is: place the first sub-insulation layer after gluing and assembly on the first laminated base plate, place a positioning mechanism on the periphery of the laminated base plate, then place the second laminated base plate, and place the second laminated base plate on the The second secondary insulation layer is placed on the two laminated base plates; after stacking to the set number of layers in sequence, it is sent to the press for lamination and subsequent aging; and then the main insulation layer must be dismantled in sequence before gluing and assembling Correspondingly press the base plate, and then carry out the process steps such as gluing and assembly, the production efficiency is low

[0009] (3) There are defects in the quality monitoring and traceability of the manufacturing process

Since all the outer surfaces of the reinforced polyurethane standard insulation box have to be processed after aging, the original methods such as spraying codes or barcode pasting cannot be applied to the manufacturing process of the reinforced polyurethane standard insulation box; in addition, the reinforced polyurethane standard insulation box Most of them are large-scale workpieces processed in three dimensions. The manual inspection method adopted by the existing technology is difficult to meet the requirements of multi-model and large-scale inspection, which affects the normal operation of the quality control system and easily causes quality monitoring and traceability in the manufacturing process. out of control

Images