Production method and assembly line of insulation box for liquid natural gas carrier

Abstract

The invention relates to a method and production line to manufacturing an insulating tank for a liquefied natural gas carrier. The method includes the working procedures of ''mould piggybacking'', ''clapboard assembling'', ''temporary clapboard fixing'', ''clapboard fixing by nailing'', ''roof plate assembling and temporary fixing'', ''roof plate fixing by nailing'', ''bar code affixing'', ''tank body overtuning'', ''double-layer roof plate assembling and temporary fixing'', ''double-layer roof plate fixing by nailing'', ''tank body leveling up'', ''insulating material filling'', ''filling density checking'', ''bottom plate assembling and temporary fixing'', ''bottom plate fixing by nailing'', ''tank body finishing'', ''tank body conveying and cleaning'', ''tank body packaging'' and ''tank body transporting''. By implementing such technical process for producing insulating tanks applied to LNG ships, the labor is largely saved, the production efficiency is improved, and the requirement of high precision of insulation tanks is satisfied.

Description

technical field [0001] The invention relates to a liquefied natural gas ship, in particular to a manufacturing method and a production line for insulating boxes on a liquefied natural gas ship. Background technique [0002] The insulation box is a key component of a thin-film liquefied natural gas (LNG for short) ship. The ultra-low temperature liquefied natural gas in the cargo hold of the LNG ship is mainly supported by the insulating box, and the ultra-low temperature of minus 163°C in the cargo hold is also mainly maintained by the insulating box. [0003] The insulating box is made of spliced ​​plywood. Fastened with staples or screws and filled with insulating material (glass wool, perlite or rigid insulation) for thermal insulation. [0004] Membrane-type LNG carriers account for more than 80% of the LNG carriers in global operation and construction; a NO.96 membrane-type LNG carrier of 145,000 cubic meters needs about 55,000 insulation boxes. How to control the man...

AI Technical Summary

Problems solved by technology

[0008] ①. This manufacturing method makes the equipment arranged in a single "linear shape" according to the production process, which lacks flexibility and reduces production efficiency

For example: According to the characteristics of the insulation box, it can be divided into two types: single-layer roof and double-layer roof. The insulation box of the single-layer roof type does not need to go through the steps of "assembly and nailing of the double-layer roof", such as Arranged in a "straight line shape", the insulation box of the single-layer roof model must go through this step, which wastes manufacturing man-hours and reduces efficiency

[0009] ②. There are defects in the traceability of quality

This method is not described for this kind of mark, lacks corresponding steps to complete the distribution of marks, and is out of control in terms of quality traceability, seriously affecting the operation of the quality system

[0010] ③.In terms of the equipment, the quantity is insufficient, resulting in the waste of production hours and reducing the production efficiency

Through a lot of investigation and analysis, it is found that the number of insulation boxes that can be completed in the first stage per unit time is far greater than the number of insulation boxes that can be completed in the second stage. If only one filling device is equipped, it will inevitably cause a loss of semi-finished insulation boxes on the assembly line. accumulation, reducing production efficiency

[0011] At present, more reasonable automation equipment has been developed (such as: automatic nailing robot, leveling machine, perlite automatic filling station, etc.), and the original manufacturing method can no longer effectively use these equipment

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