A device for welding inside a large exhaust pipe of a methanol dual-fuel ship

Abstract

The utility model relates to a kind of methanol dual-fuel ship large exhaust pipe inside welding device, which belongs to the technical field of ship design.The device is supported by supporting angle steel inside the exhaust pipe, and the scaffold platform is hoisted to the supporting angle steel by crane;the welder enters the inside of the exhaust pipe through manhole to weld.The scheme in the application avoids the huge construction amount of the prior art, which needs to set up multiple layers of scaffold and dismantle after the work is completed, and the worker enters the welding work area simply without climbing a long distance, saving time and effort, and ensuring the safety of the welding workers.

Description

Technical Field

[0001] This utility model relates to a welding device for the internal welding of a large exhaust pipe of a methanol dual-fuel ship, which belongs to the field of ship design technology. Background Technology

[0002] The main engine exhaust pipes have large diameters, sometimes reaching several meters, and are quite long, generally exceeding 30 meters. During shipbuilding, after installation on the ship in a vertical position, the joints between the pipes need to be connected with sleeves. Welding is required inside the sleeves, but the welding positions are far from the open ends, making it difficult for personnel to reach them. The current practice is for personnel to enter the exhaust pipe from the nearest open standing point and then build scaffolding layer by layer from bottom to top towards the sleeves. Typically, several layers of scaffolding are laid, reaching a height of over 10 meters. Personnel climb the scaffolding to reach the welding position, stand on it, and complete the internal welding work between the sleeves and the exhaust pipe. After welding, the welders then leave via the scaffolding, and finally, the scaffolding is dismantled layer by layer. The amount of work involved in laying and dismantling the scaffolding is enormous, and it is time-consuming and unsafe for welding personnel and equipment to climb. Utility Model Content

[0003] Existing technologies require the erection of numerous scaffolds to reach the welding position, resulting in a massive workload. Furthermore, personnel must climb considerable distances to reach the welding location, and dismantling the scaffolds after welding is also a significant undertaking. To address this issue, this invention provides a device for welding the interior of large exhaust pipes on methanol dual-fuel ships. This device avoids the need for multi-layered scaffolding for high-altitude operations, saving time and labor while ensuring the safety of welding personnel. It eliminates the need for laying and dismantling large amounts of scaffolding and allows welding personnel easier access to the welding position.

[0004] The technical solution adopted in this utility model is as follows: a device for internal welding of a large exhaust pipe for a methanol dual-fuel ship, wherein an outer sleeve is fitted onto the outside of two exhaust pipe sections, and the ends of the two exhaust pipe sections and the inner wall surface of the outer sleeve form an internal welding area; a manhole is provided on one side of the exhaust pipe, and several supporting angle steels are welded to the inner wall surface below the manhole of the exhaust pipe, and the supporting angle steels are arranged in a circular array; a scaffolding platform is provided on the supporting angle steels, so that the internal welding area is located in the welding operation area where the workers stand on the scaffolding platform; The scaffolding platform is constructed using an internal cross frame and an outer ring frame. The cross frame and the outer ring frame are fixed together by bolts, and the scaffolding boards are fixed to the cross frame and the outer ring frame. The outer ring frame is provided with protective rubber around its outer perimeter. The diameter of the outer ring frame is smaller than the inner diameter of the exhaust pipe and larger than the radius of the inner end array circle of the supporting angle steel. The supporting angle steel is supported on the outer ring frame. A surrounding plate is installed on the outer wall of the exhaust pipe of the manhole, and the cover plate is fixed to the surrounding plate with bolts; the manhole is located on the exhaust pipe between the internal welding area and the supporting angle steel.

[0005] Furthermore, the cross frame is provided with lifting lugs for hoisting the scaffolding platform.

[0006] A method for operating a welding device for the internal welding of a large exhaust pipe of a methanol dual-fuel ship includes the following steps: S1. Pre-install the supporting angle steel inside the exhaust pipe below the welding area, and load it onto the ship along with the exhaust pipe; S2. The manhole and cover plate are pre-installed outside the manhole of the exhaust pipe. The manhole is located on the exhaust pipe between the internal welding area and the supporting angle steel and is carried onto the ship together with the exhaust pipe. S3. After the exhaust pipe is installed, use the overhead crane to lift the scaffolding platform into the exhaust pipe through the lifting lugs and place it on the supporting angle steel. S4. Personnel remove the cover plate from the outside, enter the inside of the exhaust pipe through the manhole, set up scaffold boards on the scaffold platform, and perform welding work inside the exhaust pipe while standing on the scaffold platform. S5. After the welding operation is completed, the personnel leave through the manhole of the exhaust pipe, and the cover plate is fastened to the enclosure with bolts. The scaffolding platform is lifted out of the exhaust pipe by a crane, and the supporting angle steel does not need to be removed.

[0007] Compared with existing technologies, this utility model has the following advantages: The device uses supporting angle steel installed inside the chimney, and a crane hoists the scaffolding platform onto the supporting angle steel for support; welders enter the chimney through manholes to perform welding. This solution avoids the enormous workload of existing technologies that require welding multiple layers and erecting a large amount of scaffolding, and dismantling a large amount of scaffolding after completion. The solution in this application allows personnel to easily enter the welding area without climbing long distances, and ensures operational safety. This application eliminates the need for laying and dismantling large amounts of scaffolding, while making it easier for welding workers to reach the welding position; it saves time and labor, and ensures the safety of welding workers. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of a welding device for the internal welding of a large exhaust pipe of a methanol dual-fuel ship.

[0010] Figure 2 yes Figure 1 The view of AA in the middle.

[0011] Figure 3 This is an enlarged view of the area near the internal soldering zone.

[0012] Figure 4 This is a structural diagram of the scaffolding platform.

[0013] In the diagram: 1. Scaffolding platform, 2. Supporting angle steel, 3. Manhole, 4. Anti-collision rubber, 5. Cross frame, 6. Lifting lug, 7. Frame bolt, 8. Cover plate, 9. Enclosure, 10. Exhaust pipe, 11. Outer sleeve, 12. Internal welding area, 13. Outer frame, 14. Scaffolding board. Detailed Implementation

[0014] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] 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 exemplary embodiments according to the present 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.

[0017] 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 this 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 drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0018] In the description of this utility model, 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 usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model 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 utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0019] 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.

[0020] 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 cannot be construed as limiting the scope of protection of this utility model.

[0021] A welding device for the interior of a large ship exhaust pipe, comprising a scaffolding platform, supporting angle steel, and a manhole cover. The scaffolding platform 1 is composed of anti-collision rubber 4, a cross frame 5, lifting lugs 6, and frame bolts 7. The manhole cover is composed of a surrounding plate 9 and a cover plate 8.

[0022] The scaffolding platform 1 consists of anti-collision rubber 4, a cross frame 5, lifting lugs 6, and bolts. The cross frame 5 is composed of angle steel and flat steel. The lifting lugs 6 are welded to the cross frame 5. The anti-collision rubber 4 is fixed to the outside of the outer ring frame 13 with bolts to prevent impact damage. The frame bolts 7 connect the cross frame 5 and the outer ring frame 13. Specifically, the outer ring frame 13 adopts a 4-fan-shaped structure, and the straight edge of the fan-shaped structure is connected to the cross frame 5 by bolts 7. The cross frame 5 is a telescopic structure, which can adjust the size of the cross frame. With the corresponding diameter of the outer ring frame 13, it can adapt to various diameter exhaust pipes.

[0023] The supporting angle steel 2 is a section of right-angle steel, pre-welded inside the exhaust pipe body, below the internal welding position. The welding position of the supporting angle steel 2 is crucial; it needs to be positioned below the manhole 3 to facilitate workers' access to the scaffolding platform, while ensuring that the internal welding area 12 is within the workers' working range when they are standing on the scaffolding platform 1. The manhole cover consists of a surrounding plate 9 and a cover plate 8, which are bolted together. The surrounding plate 9 is welded to the outside of the exhaust pipe.

[0024] Instructions for use: The supporting angle steel 2 is pre-installed inside the exhaust pipe below the welding point and is carried onto the ship along with the exhaust pipe. The manhole cover is pre-installed outside the manhole of the exhaust pipe, between the internal welding point and the supporting angle steel 2, and is also carried onto the ship along with the exhaust pipe. After the exhaust pipe is installed, the scaffolding platform 1 is placed on the supporting angle steel 2 using the overhead crane and lifting lugs 6. Personnel remove the manhole cover plate 8 from the outside and enter the exhaust pipe through the manhole. Scaffold boards are laid on the scaffolding platform 1, and welding work is carried out inside the exhaust pipe while standing on the scaffolding platform 1. After the welding work is completed, personnel leave through the manhole of the exhaust pipe, and the manhole cover plate 8 is bolted to the surrounding plate 9. The scaffolding platform 1 is then lifted out of the exhaust pipe by the crane, and the supporting angle steel 2 does not need to be removed.

[0025] Currently, only the topmost exhaust pipe needs welding. If multiple welding is required, the exhaust pipes are installed layer by layer. Before the upper exhaust pipe is installed, the welding operation is carried out at the hoisting position. After the welding is completed and the pipe is hoisted out, the next layer of exhaust pipe is installed and welded.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for internal welding of a large exhaust pipe for a methanol dual-fuel ship, characterized in that: The two exhaust pipes are fitted with an outer sleeve (11), and the ends of the two exhaust pipes and the inner wall of the outer sleeve (11) form an internal welding area (12); a manhole (3) is provided on one side of the exhaust pipe (10), and several supporting angle steels (2) are welded on the inner wall below the manhole of the exhaust pipe (10). The supporting angle steels (2) are arranged in a circular array; a scaffolding platform (1) is provided on the supporting angle steels (2), so that the internal welding area (12) is located in the welding operation area where the workers stand on the scaffolding platform (1); The scaffolding platform (1) is constructed using an internal cross frame (5) and an outer ring frame (13). The cross frame (5) and the outer ring frame (13) are fixed together by bolts (7). The scaffolding board (14) is fixed to the cross frame (5) and the outer ring frame (13). The outer ring frame (13) is provided with protective rubber (4) on its outer periphery. The diameter of the outer ring frame (13) is smaller than the inner diameter of the chimney (10) and larger than the radius of the inner end array circle of the supporting angle steel. The supporting angle steel (2) is supported on the outer ring frame (13). A surrounding plate (9) is installed on the outer wall of the exhaust pipe of the manhole (3), and the cover plate (8) is fixed to the surrounding plate (9) by bolts; the manhole (3) is installed on the exhaust pipe between the internal welding area (12) and the supporting angle steel (2).

2. The device for internal welding of a large exhaust pipe for a methanol dual-fuel ship according to claim 1, characterized in that: The cross frame (5) is provided with lifting lugs (6) for hoisting the scaffolding platform.

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