A coating method suitable for a horizontal tank type bulkhead of a marine methanol fuel tank

Abstract

The application relates to a coating method suitable for horizontal groove type bulkheads of ship methanol fuel tanks, and belongs to the technical field of ship surface treatment. The distance between the upper and lower adjacent two layers of scaffolds is set as a height suitable for standing operation of coating workers, so that the workers can not reach the upper groove when coating, and the workers need to bend or squat to polish, re-coat and pre-coat and the like. When special coating is carried out, the construction difficulty is reduced as much as possible, and the whole surface of the groove type bulkhead is easy to reach. Meanwhile, through cooperation of the bulkhead and the scaffold, the steel consumption and processing amount are reduced as much as possible under the requirement of satisfying the strength. In the application, folding steps are arranged on the scaffold in the front of the web, and the scaffold is left empty in the back of the web, so that sufficient coating space is left for coating of the scaffold and the bulkhead, the free edge of the bulkhead is reduced to the maximum, and the service life of the methanol tank is prolonged.

Description

Technical Field

[0001] This invention relates to a coating method suitable for horizontal trough-shaped bulkheads of marine methanol fuel tanks, belonging to the technical field of ship surface treatment. Background Technology

[0002] Due to increasingly stringent requirements from IMO regulations regarding sulfur oxides, nitrogen oxides, and carbon emissions, traditional fossil fuels struggle to meet these emission reduction requirements. Green methanol, however, can reduce carbon emissions by 95%, leading to a growing number of ship owners choosing methanol as an alternative fuel.

[0003] Using methanol as an alternative fuel requires a dedicated methanol fuel tank. The industry standard for methanol fuel tank walls is trough-shaped, but impurities such as formic acid and methyl formate in methanol fuel can corrode the tank walls. Therefore, special coatings are needed for the methanol fuel tank, and the number of free edges inside the tank should be minimized to reduce corrosion. The challenge lies in coordinating the tank walls and scaffolding to facilitate painting work for workers while minimizing free edges within the tank. Summary of the Invention

[0004] This invention discloses a coating method suitable for horizontal trough-shaped bulkheads of marine methanol fuel tanks, which reduces the construction difficulty of special coating, ensures that the entire surface of the trough-shaped bulkhead can be easily coated, and reduces the number of free edges inside the tank.

[0005] The technical solution adopted in this invention is: a coating method suitable for horizontal groove-shaped bulkheads of marine methanol fuel tanks. The structure of the horizontal groove-shaped bulkhead is that the upper and lower ends of the panel are respectively connected to inclined web plates to form horizontal grooves. The groove openings of two adjacent horizontal grooves face opposite directions. The side with an obtuse angle between the panel and the web plate connected above is the front of the web plate, and the other side is the back of the web plate.

[0006] The method specifically includes the following steps:

[0007] S1. Set up a folding scaffold structure on the front of the web using a folding scaffold connecting plate: fix the folding scaffold connecting plate on the panel, align the bolt holes of the folding scaffold elbow plate on the folding scaffold with the bolt holes of the folding scaffold connecting plate, and tighten them with bolts to connect the folding scaffold to the front of the web.

[0008] S2. The folding scaffolding pedal is fixedly installed on the folding scaffolding. The front end of the folding scaffolding pedal is movably connected to the folding plate through the connecting rod, so that the folding plate can be flipped between the scaffolding pedal and the front end of the folding scaffolding.

[0009] S3. Set up an empty plate scaffolding structure on the back of the web plate through the empty scaffolding connecting plate: The empty scaffolding connecting plate is fixed on the panel. The empty scaffolding connecting plate and the folding scaffolding connecting plate are symmetrically arranged. Align the bolt holes of the empty scaffolding elbow plate with the bolt holes of the empty scaffolding connecting plate and tighten them with bolts to connect the empty scaffolding to the back of the web plate.

[0010] S4. Fix the empty scaffolding footboard on the empty scaffolding. The distance from the front edge of the footboard to the front edge of the scaffolding is the empty scaffolding. The width of the empty scaffolding is 250mm-350mm.

[0011] S5. When painting the front of the web, flip the folding plate to the front of the folding scaffold. The painting worker stands on the folding plate and first paints the upper panel, then paints the lower web on the scaffolding board. Then flip the folding plate to the folding scaffolding board and paint the connection between the lower part of the web and the folding scaffolding connecting plate.

[0012] S6. When painting the back of the web, the painting worker stands on the scaffolding platform and first paints the upper panel, then paints the lower web; then, using the scaffolding, paints the connection between the lower web and the scaffolding connecting plate.

[0013] Furthermore, the width of the panel is equal to the width of the web.

[0014] Furthermore, the distance between the top edges of the upper and lower panels is 1850~1950mm.

[0015] Furthermore, in step S5, when the painting worker is painting the upper panel, the painting worker steps on the web plate to assist in the painting process.

[0016] The beneficial effects of this invention are as follows: The distance between two adjacent layers of scaffolding is set at a suitable standing height for painting workers. This avoids situations where the height is too high, making it inaccessible to workers during upper channel painting; and avoids situations where the height is too low, requiring workers to bend over or squat throughout sanding, touch-up painting, and pre-coating. In other words, during special coating, the construction difficulty is minimized, ensuring easy coverage of the entire surface of the tank bulkhead. Simultaneously, the coordination between the bulkhead and scaffolding, while meeting the required strength specifications, minimizes the amount of steel used and processing. This invention includes folding footboards on the scaffolding on the front of the web and provides scaffold space on the back of the web, allowing ample painting space for the scaffolding in contact with the bulkhead, minimizing the free edges of the bulkhead and extending the service life of the methanol tank. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the horizontal tank structure inside the methanol fuel tank.

[0018] Figure 2 This is a schematic diagram of the equipment used in the coating method.

[0019] Figure 3 This is a schematic diagram of a folding scaffold structure.

[0020] Figure 4 This is a schematic diagram of an open-frame scaffold structure.

[0021] Figure 5 This is a schematic diagram of the painting process on the front of the web plate.

[0022] Figure 6 This is a schematic diagram of the painting process on the back of the web plate.

[0023] In the diagram: 1. Panel, 2. Web plate, 3. Folding scaffold connecting plate, 4. Folding scaffold elbow plate, 5. Folding scaffold, 6. Folding scaffold board, 7. Connecting rod, 8. Folding plate, 9. Empty scaffold connecting plate, 10. Empty scaffold elbow plate, 11. Empty scaffold, 12. Empty scaffold board, 13. Front edge of board board, 14. Front edge of scaffold, 15. Empty scaffold. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] Figures 1 to 4A horizontal groove-type bulkhead coating device suitable for marine methanol fuel tanks is shown. In this device, the upper and lower ends of the panel 1 are respectively connected to the inclined web plate 2 to form horizontal grooves. The groove openings of two adjacent horizontal grooves face opposite directions. The side with an obtuse angle between the panel 1 and the web plate 2 connected above is the front of the web plate, and the other side is the back of the web plate.

[0032] The width of panel 1 is equal to the width of web 2: Due to the structural characteristics of the trough-shaped bulkhead, and since the web and panel are generally in the form of compression bending, they must be of the same thickness. Therefore, when the width of the panel and the width of the web are a≈b, the thickness of the web and panel are approximately equal, which saves the most material.

[0033] The distance between the top edges of the two panels 1 is 1850~1950mm. Figure 1 The value of height c is very important. Generally speaking, if height c is too large, a and b will be too wide, the plate thickness will increase significantly, and material will be wasted. Moreover, if c is too large, it will be difficult for a person standing outside the groove to reach inside the groove for painting. If height c is too small, a and b will be too narrow. With the same total height, the number of grooves will increase, which will not only waste material but also increase the amount of processing.

[0034] Setting the height of both upper and lower scaffolding levels to 1850-1950mm is a height that allows an average person wearing a safety helmet to walk upright, significantly reducing construction difficulty. Currently, many scaffolding designs do not take human height into account, setting the scaffolding height to less than 1800mm. During construction, workers have to constantly bend over. Since there are many scaffolding structures for methanol tanks, workers not being able to straighten their backs not only suffer physical strain but also cannot guarantee the quality of the coating.

[0035] A folding scaffolding structure is provided on the front of the web plate at the top of panel 1, and an open scaffolding structure is provided on the back of the web plate.

[0036] In the scaffolding structure, the scaffolding connecting plate 9 is fixedly connected to the panel 1. Bolts pass through the bolt holes on the connecting plate and the elbow plate and are tightened with nuts to connect the scaffolding 11 to the scaffolding connecting plate 9. The scaffolding footboard 12 is fixed on the scaffolding 11. The front end of the scaffolding 11 is the scaffolding 15 without the scaffolding footboard 12. The width of the scaffolding 15 is the distance between the front edge 13 of the footboard and the front edge 14 of the scaffolding. The width of the scaffolding 15 is 250-350mm to allow space for painting.

[0037] In the folding scaffold structure, a folding scaffold connecting plate 3 is fixedly connected to the panel 1. The folding scaffold connecting plate 3 and the open scaffold connecting plate 9 are arranged symmetrically. Bolts pass through the bolt holes on the connecting plate and the bolt holes on the elbow plate and are locked with nuts to connect the folding scaffold 4 to the folding scaffold connecting plate 3.

[0038] A folding scaffolding pedal 6 is fixedly mounted on the folding scaffolding 5. The front end of the folding scaffolding pedal 6 is movably connected to a folding plate 8 via a connecting rod 7, allowing the folding plate 8 to flip between the folding scaffolding pedal 6 and the front end of the folding scaffolding 5. The width of the folding plate 8 is 250-350mm, leaving space for painting. The folding plate 8 can be flipped from the folding scaffolding pedal 6 to the front end of the folding scaffolding 5 via the connecting rod 7, or the folding plate 8 can be flipped back from the front end of the folding scaffolding 5 onto the folding scaffolding pedal 6 via the connecting rod 9.

[0039] When the above technical solution is used, such as Figure 5 and Figure 6 The following steps are used as shown:

[0040] S1. A folding scaffold structure is set on the front of the web plate by means of the folding scaffold connecting plate 3: the folding scaffold connecting plate 3 is fixed on the panel 1, the bolt holes of the folding scaffold elbow plate 4 on the folding scaffold 5 are aligned with the bolt holes of the folding scaffold connecting plate 3, and the bolts are tightened to connect the folding scaffold 5 to the front of the web plate.

[0041] S2. The folding scaffolding pedal 6 is fixedly installed on the folding scaffolding 5. The front end of the folding scaffolding pedal 6 is movably connected to the folding plate 8 through the connecting rod 7, so that the folding plate 8 can be flipped between the folding scaffolding pedal 6 and the front end of the folding scaffolding 5.

[0042] S3. An empty-plate scaffold structure is set on the back of the web plate through the empty-frame scaffold connecting plate 9: The empty-frame scaffold connecting plate 9 is fixed on the panel 1. The empty-frame scaffold connecting plate 9 and the folding scaffold connecting plate 3 are symmetrically arranged. The bolt holes of the empty-frame scaffold elbow plate 10 of the empty-frame scaffold 11 are aligned with the bolt holes of the empty-frame scaffold connecting plate 9 and locked with bolts to connect the empty-frame scaffold 11 to the back of the web plate.

[0043] S4. Fix the empty scaffolding footboard 12 on the empty scaffolding 11. The front edge 13 of the footboard to the front edge 14 of the scaffolding is the empty scaffolding 15. The width of the empty scaffolding 15 is 250mm-350mm.

[0044] S5. When painting the front of the web plate, flip the folding plate 8 to the front end of the folding scaffold 5. The painting worker first stands on the folding plate 8 with one foot and steps on the web plate 2 with the other foot to paint the upper panel 1. Then, paint the lower web plate 2 on the folding scaffold pedal 6. Then, flip the folding plate 8 to the folding scaffold pedal 6 to paint the connection between the lower part of the web plate 2 and the folding scaffold connecting plate 3.

[0045] Furthermore, this invention allows workers to easily reach the inner surface of the scaffolding by placing one foot on the scaffolding and the other on the grooved strip. If the scaffolding is poorly positioned, it is difficult for a person to reach all parts of the inner surface.

[0046] like Figure 3 As shown, a flip-up structure is set at the end of the scaffolding board with a connecting rod. The width of this flip-up board is greater than 250mm, so that special coating can be applied to the bending area.

[0047] S6. When painting the front of the web plate, the painter first paints the upper panel 1, then paints the lower web plate 2; then, using the scaffolding 15, paints the connection between the lower part of the web plate 2 and the scaffolding connecting plate 9. For example... Figure 2 As shown, d is the distance between the foot pedal and the groove strip, which is 250mm. This is to meet the construction distance for special coating of the groove strip, and also to meet the safety distance so that people will not fall in.

[0048] The above embodiments are only used to illustrate the present invention. Any equivalent transformations and improvements made on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A coating method suitable for horizontal trough-shaped bulkheads of marine methanol fuel tanks, characterized in that: The structure of the horizontal trough-shaped bulkhead is that the upper and lower ends of the panel (1) are respectively connected to the inclined web plate (2) to form a horizontal trough. The openings of two adjacent horizontal troughs face opposite directions. The side with an obtuse angle between the panel (1) and the web plate (2) connected above is the front of the web plate, and the other side is the back of the web plate. The method specifically includes the following steps: S1. Set up a folding scaffold structure on the front of the web plate by means of the folding scaffold connecting plate (3): The folding scaffold connecting plate (3) is fixed on the panel (1), the bolt holes of the folding scaffold elbow plate (4) on the folding scaffold (5) are aligned with the bolt holes of the folding scaffold connecting plate (3), and the folding scaffold (5) is locked with bolts to connect the folding scaffold (5) to the front of the web plate. S2. The folding footboard (6) is fixedly installed on the folding scaffold (5). The front end of the folding footboard (6) is movably connected to the folding plate (8) through the connecting rod (7), so that the folding plate (8) can be flipped between the folding footboard (6) and the front end of the folding scaffold (5). S3. Set up an empty plate scaffold structure on the back of the web plate through the empty scaffold connecting plate (9): The empty scaffold connecting plate (9) is fixed on the panel (1). The empty scaffold connecting plate (9) and the folding scaffold connecting plate (3) are symmetrically arranged. Align the bolt holes of the empty scaffold elbow plate (10) of the empty scaffold (11) with the bolt holes of the empty scaffold connecting plate (9) and tighten them with bolts to connect the empty scaffold (11) to the back of the web plate. S4. Fix the empty scaffolding footboard (12) on the empty scaffolding (11). The front edge of the footboard (13) to the front edge of the scaffolding (14) is the empty scaffolding (15). The width of the empty scaffolding (15) is 250mm-350mm. S5. When painting the front of the web, flip the folding plate (8) to the front of the folding scaffold (5), and the painting worker stands on the folding plate (8) to paint the upper panel (1) first, and then paint the lower web (2) on the folding scaffolding footboard (6); then flip the folding plate (8) to the folding scaffolding footboard (6) and paint the connection between the lower part of the web (2) and the folding scaffolding connecting plate (3); S6. When painting the back of the web, the painting worker stands on the scaffolding footboard (12) and first paints the upper panel (1), then paints the lower web (2); then, using the scaffolding (15), paints the connection between the lower part of the web (2) and the scaffolding connecting plate (9).

2. The coating method for a horizontal trough-shaped bulkhead suitable for a marine methanol fuel tank according to claim 1, characterized in that: The width of the panel (1) is equal to the width of the web (2).

3. The coating method for a horizontal trough-shaped bulkhead suitable for a marine methanol fuel tank according to claim 1, characterized in that: The distance between two adjacent layers of scaffolding is 1850~1950mm.

4. The coating method for a horizontal trough-shaped bulkhead suitable for a marine methanol fuel tank according to claim 1, characterized in that: In step S5, when the painting worker is painting the upper panel (1), the painting worker steps on the belly plate (2) to assist in the painting.

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