Manufacturing method of LNG ship gas dome insulating plug

Abstract

The invention discloses a manufacturing method of an LNG ship gas dome insulating plug, which comprises the following steps: selecting two foam substrates, namely a first foam substrate and a second foam substrate; a first cross-shaped groove, a second cross-shaped groove and breathing holes are formed in the front face and the back face of the first foam base plate and the front face and the back face of the second foam base plate correspondingly; pressing to form a first insulating composite board and a second insulating composite board; the first insulation composite board and the second insulation composite board are machined into a semicircular structure through numerical control, and the splicing face of the first insulation composite board and the splicing face of the second insulation composite board are machined into a first step and a second step which are matched with each other; adhering to form an insulating combined composite board; and after tightening, fixing and protecting operation are conducted on the insulation combined composite board, the insulation combined composite board is fed into a pressing machine to be pressed, pressure relief and follow-up cleaning work are conducted after pressing is completed, and manufacturing of the insulation plug is completed. According to the method, the limitation of machining equipment and pressing equipment is eliminated, the manufacturing efficiency of the air dome insulation plug is improved, and the manufacturing effect of the air dome insulation plug is improved.

Description

Technical Field

[0001] The invention belongs to the field of liquefied natural gas, and in particular relates to a method for manufacturing an insulating plug for an LNG ship gas dome. Background Art

[0002] LNG (liquefied natural gas) ships are special ships used to store and transport liquefied natural gas. Liquefied natural gas is stored in the storage tanks on LNG ships. The gas dome structure is an important component of the storage tank. First, it can seal the storage tank and withstand the internal pressure to ensure the safe storage and transportation of liquefied natural gas. Secondly, it can reduce the volume and weight of the storage tank and improve the storage efficiency and transportation efficiency of the storage tank. Finally, it can improve the reliability and safety of the storage tank and reduce the risk of accidents.

[0003] Each storage compartment needs to be equipped with an air dome structure, such as Figure 1 As shown, it includes a gas dome cover, an insulating plug, a sealing plate and a gas dome enclosure, as shown in FIG. Figure 2 to Figure 4 As shown, the insulating plug is a circular structure, with a reinforced polyurethane foam board in the middle and plywood for upper and lower reinforcement. The foam board has cross-shaped grooves on the front and back, and breathing holes that are connected to each other at the end of the groove. According to the appearance of the insulating plug, the foam board must first be processed with cross grooves and breathing holes, and then bonded to the plywood. However, in actual preparation, since the diameter of the insulating plug reaches 1950mm, on the one hand, the processing width of the processing equipment for the cross grooves and breathing holes is generally within the range of 1.2m, which makes the processing of the cross grooves and breathing holes very limited. Multiple equipment must be combined to complete the processing in parts, which leads to low processing efficiency and the molding accuracy of the cross grooves and breathing holes cannot be guaranteed. On the other hand, the pressing width of the press is within the range of about 1.4m, which is also difficult to achieve one-time pressing. Multiple presses must cooperate to complete the pressing operation, which not only complicates the pressing operation and reduces the pressing efficiency, but also there must be a certain pressing error between multiple presses, resulting in a not particularly ideal pressing effect. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, a method for manufacturing an air dome insulating plug for an LNG ship is provided, which adopts a semi-split method to process the cross groove and the breathing hole, and adopts a combination of semi-split pressing and combined pressing to complete the pressing of the foam board and the plywood, thereby eliminating the limitations of the processing equipment and the pressing equipment, improving the manufacturing efficiency of the air dome insulating plug, and enhancing the manufacturing effect of the air dome insulating plug.

[0005] Technical solution: To achieve the above purpose, the present invention provides a method for manufacturing an LNG ship gas dome insulating plug, comprising the following steps:

[0006] S1: Select two foam substrates, namely a first foam substrate and a second foam substrate;

[0007] S2: using a CNC machining device to process a first cross groove and a second cross groove on the front and back surfaces of the first foam substrate and the second foam substrate according to the size, and to process breathing holes on the first cross groove and the second cross groove;

[0008] S3: gluing the front and back surfaces of the first foam substrate and the second foam substrate to plywood, and pressing them together to form a first insulating composite board and a second insulating composite board;

[0009] S4: CNC-processing the first insulating composite board and the second insulating composite board into a semicircular structure, and processing the joint surface of the first insulating composite board and the second insulating composite board into a first step and a second step that match each other;

[0010] S5: bonding the first insulating composite board and the second insulating composite board together through the first step and the second step to form an insulating composite board, and the first cross groove and the second cross groove are butted together to form a standard cross groove;

[0011] S6: After tightening, fixing and protecting the insulating composite board, it is sent to the press for pressing. After pressing, the pressure is released and subsequent cleaning is carried out to complete the production of the insulating plug.

[0012] Furthermore, in the step S1, both the first foam substrate and the second foam substrate are rectangular structures.

[0013] Furthermore, in the step S2, the notches of the first cross groove and the second cross groove are respectively located at the joint surfaces of the first foam substrate and the second foam substrate.

[0014] Furthermore, in step S3, deep-cold PU glue is used for bonding.

[0015] Furthermore, in step S3, in order to prevent excessive glue from being squeezed into the cross groove and blocking the breathing hole, no glue is applied in the range of 5-8 mm around the cross groove, and the cross groove and the non-glue-coated area are sealed with paper tape in advance. After the overall glue coating is completed, the tape is removed, and then the assembly and bonding are carried out with the plywood.

[0016] Furthermore, in step S4, the first step and the second step are respectively located on the front and back sides of the first insulating composite board and the second insulating composite board, the first step mills off the first cross groove on the back side of the first insulating composite board, and only retains a section of the first docking groove connected to the second cross groove, and the second step mills off the second cross groove on the front side of the second insulating composite board, and only retains a section of the second docking groove connected to the first cross groove.

[0017] Furthermore, in step S5, the first butt joint groove on the back side of the first insulating composite board is butt jointed with the second cross groove on the back side of the second insulating composite board to form a standard cross groove, and the second butt joint groove on the front side of the second insulating composite board is butt jointed with the first cross groove on the front side of the first insulating composite board to form a standard cross groove.

[0018] Furthermore, the tightening and fixing operation in step S6 includes: using a nylon tightening belt to completely lock the first insulating composite panel and the second insulating composite panel together.

[0019] Furthermore, the protection operation in step S6 includes: covering the top of the insulating composite composite board with a non-adhesive PP film for isolating the pressure head; and evenly arranging plywood protection sheets on the sides of the insulating composite composite board.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0021] 1. The standard cross slot is designed to be spliced ​​with the first cross slot and the second cross slot, so that the first cross slot and the second cross slot can meet the processing range requirements of the processing equipment, eliminate the processing limitations of the processing equipment, and do not require multiple devices to cooperate to complete the processing, thereby improving the efficiency of cross slot processing and ensuring the processing effect of the cross slot.

[0022] 2. The foam board and the plywood are pressed together by a combination of semi-split pressing and combined pressing. The pressing method of the first insulating composite board and the second insulating composite board in the front section meets the pressing width range of the press. The insulating composite composite board is pressed in the rear section. Since only the joint of the first insulating composite board and the second insulating composite board needs to be pressed, the pressing effect will not be affected by the overall diameter. Therefore, the processing limitations of the pressing equipment are eliminated. There is no need for multiple pressing equipment to cooperate to complete the processing or adjust the product position for multiple pressing operations, which improves the pressing efficiency and ensures the pressing effect. The production quality of the insulating plug can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded view of the gas dome;

[0024] Figure 2 This is the appearance diagram of the insulating plug;

[0025] Figure 3 This is an exploded view of the insulating plug;

[0026] Figure 4 It is a schematic diagram of the planar structure of the cross-shaped groove and the breathing hole;

[0027] Figure 5 is a structural diagram of a foam substrate;

[0028] Figure 6It is the structural diagram of the cross groove on the foam substrate;

[0029] Figure 7 It is a schematic diagram of the bonding structure of the insulating composite panel;

[0030] Figure 8 It is a processing schematic diagram of an insulating composite panel;

[0031] Fig. 9 This is a structural diagram of the processed insulating composite panel;

[0032] Fig.10 Schematic diagram of the pressing of the insulating composite panel. DETAILED DESCRIPTION

[0033] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0034] The present invention provides a method for manufacturing an LNG ship gas dome insulating plug, comprising the following steps:

[0035] S1: Figure 5 As shown, two foam substrates are selected, namely a first foam substrate and a second foam substrate. The first foam substrate and the second foam substrate are both rectangular structures and have the same size, with a length and a width of 1965 mm and 1065 mm;

[0036] S2: using CNC machining equipment to process a first cross groove and a second cross groove on the front and back surfaces of the first foam substrate and the second foam substrate according to the size, and to process breathing holes on the first cross groove and the second cross groove, and the notches of the first cross groove and the second cross groove are respectively located at the joint surfaces of the first foam substrate and the second foam substrate;

[0037] like Figure 6 As shown, taking the first foam substrate 1 as an example, the two first cross grooves 2 are respectively located on the front and back sides of the first foam substrate 1 , the breathing hole passes through the first foam substrate 1 and the two ends of the breathing hole are respectively located on the two first cross grooves 2 .

[0038] S3: Figure 7 As shown, the front and back surfaces of the first foam substrate and the second foam substrate are both adhered to plywood, and pressed together to form a first insulating composite board and a second insulating composite board;

[0039] In this embodiment, deep cold PU glue is used for bonding. Figure 7In order to prevent excessive glue from being squeezed into the cross groove and blocking the breathing hole, no glue is applied within 5-8mm around the cross groove. Use paper tape to seal the cross groove and the non-glue area in advance. Remove the tape after the overall glue coating is completed, and then assemble and bond with the plywood.

[0040] S4: Figure 8 and Fig. 9 As shown, the first insulating composite board 5 and the second insulating composite board 4 are processed into a semicircular structure by numerical control, and the joint surface of the first insulating composite board 5 and the second insulating composite board 4 is processed into a first step 6 and a second step 7 that match each other;

[0041] The first step 6 and the second step 7 are respectively located on the front and back sides of the first insulating composite board 5 and the second insulating composite board 4. The first step 6 mills off the first cross groove 2 on the back side of the first insulating composite board 5, leaving only a section of the first docking groove connected to the second cross groove. The second step 7 mills off the second cross groove on the front side of the second insulating composite board 4, leaving only a section of the second docking groove connected to the first cross groove 2.

[0042] S5: The first insulating composite board and the second insulating composite board are bonded together through the first step and the second step to form an insulating composite board. At this time, the first butt joint groove on the back of the first insulating composite board 5 is butted with the second cross groove on the back of the second insulating composite board 4 to form a standard cross groove, and the second butt joint groove on the front of the second insulating composite board 4 is butted with the first cross groove on the front of the first insulating composite board 5 to form a standard cross groove.

[0043] S6: Fig.10 As shown, after tightening, fixing and protecting the insulating composite board, specifically: using a nylon tightening belt 8 to completely lock the first insulating composite board 5 and the second insulating composite board 4 together; covering the top of the insulating composite board with a non-adhesive PP film for isolating the pressure head 11; and evenly setting plywood protection sheets 9 on the sides of the insulating composite board;

[0044] The tightened, fixed and protected insulating composite panels are sent to the platform 10 of the press, and the pressure of the press cylinder is set to 10 MPa for pressing. The butt joint area of ​​the first insulating composite panel 5 and the second insulating composite panel 4 is pressed by the pressing head 11, and other areas do not need to be pressed;

[0045] After 5-6 hours of pressing, the pressure is released and the nylon tightening belt 8 is removed, and the glue squeezed out around the joint is cleaned off to complete the production of the insulating plug.

[0046] Combined with the above process, it can be seen that the present invention has the following advantages:

[0047] 1. The standard cross slot is designed to be spliced ​​with the first cross slot and the second cross slot, so that the first cross slot and the second cross slot can meet the processing range requirements of the processing equipment, eliminate the processing limitations of the processing equipment, and do not require multiple devices to cooperate to complete the processing, thereby improving the efficiency of cross slot processing and ensuring the processing effect of the cross slot.

[0048] 2. The foam board and the plywood are pressed together by a combination of semi-split pressing and combined pressing. The pressing method of the first insulating composite board and the second insulating composite board in the front section meets the pressing width range of the press. The insulating composite composite board is pressed in the rear section. Since only the joint of the first insulating composite board and the second insulating composite board needs to be pressed, the pressing effect will not be affected by the overall diameter. Therefore, the processing limitations of the pressing equipment are eliminated. There is no need for multiple pressing equipment to cooperate to complete the processing or adjust the product position for multiple pressing operations, which improves the pressing efficiency and ensures the pressing effect. The production quality of the insulating plug can be guaranteed.

Claims

1. A method for manufacturing an insulating plug for an LNG ship gas dome, characterized in that: The steps include: S1: Select two foam substrates, namely a first foam substrate and a second foam substrate; S2: using a CNC machining device to process a first cross groove and a second cross groove on the front and back surfaces of the first foam substrate and the second foam substrate according to the size, and to process breathing holes on the first cross groove and the second cross groove; S3: gluing the front and back surfaces of the first foam substrate and the second foam substrate to plywood, and pressing them together to form a first insulating composite board and a second insulating composite board; S4: CNC-processing the first insulating composite board and the second insulating composite board into a semicircular structure, and processing the joint surface of the first insulating composite board and the second insulating composite board into a first step and a second step that match each other; S5: bonding the first insulating composite board and the second insulating composite board together through the first step and the second step to form an insulating composite board, and the first cross groove and the second cross groove are butted together to form a standard cross groove; S6: After tightening, fixing and protecting the insulating composite board, it is sent to the press for pressing. After pressing, the pressure is released and subsequent cleaning is carried out to complete the production of the insulating plug.

2. The method for manufacturing an LNG ship gas dome insulating plug according to claim 1, characterized in that: In the step S1 , both the first foam substrate and the second foam substrate are rectangular structures.

3. The method for manufacturing an LNG ship gas dome insulating plug according to claim 1, characterized in that: In the step S2, the notches of the first cross groove and the second cross groove are respectively located at the joint surfaces of the first foam substrate and the second foam substrate.

4. The method for manufacturing an LNG ship gas dome insulating plug according to claim 1, characterized in that: In the step S3, deep cooling PU glue is used for bonding.

5. The method for manufacturing an LNG ship gas dome insulating plug according to claim 4, characterized in that: In step S3, in order to prevent excessive glue from being squeezed into the cross groove and blocking the breathing hole, no glue is applied in the 5-8 mm range around the cross groove, and the cross groove and the non-glue-coated area are sealed with paper tape in advance. After the overall glue coating is completed, the tape is removed, and then the assembly and bonding are performed with the plywood.

6. The method for manufacturing an LNG ship gas dome insulating plug according to claim 1, characterized in that: In step S4, the first step and the second step are respectively located on the front and back sides of the first insulating composite board and the second insulating composite board. The first step mills off the first cross groove on the back side of the first insulating composite board, leaving only a section of the first docking groove connected to the second cross groove. The second step mills off the second cross groove on the front side of the second insulating composite board, leaving only a section of the second docking groove connected to the first cross groove.

7. The method for manufacturing an LNG ship gas dome insulating plug according to claim 6, characterized in that: In step S5, the first butt joint groove on the back of the first insulating composite board is butt jointed with the second cross groove on the back of the second insulating composite board to form a standard cross groove, and the second butt joint groove on the front of the second insulating composite board is butt jointed with the first cross groove on the front of the first insulating composite board to form a standard cross groove.

8. The method for manufacturing an LNG ship gas dome insulating plug according to claim 1, characterized in that: The tightening and fixing operation in step S6 includes: using a nylon tightening belt to completely lock the first insulating composite panel and the second insulating composite panel together.

9. The method for manufacturing an LNG ship gas dome insulating plug according to claim 1, characterized in that: The protection operation in step S6 includes: covering the top of the insulating composite composite board with a non-adhesive PP film to isolate the pressure head; and evenly arranging plywood protection sheets on the sides of the insulating composite composite board.

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