Ship exhaust device and assembling method

Abstract

According to the ship exhaust device and the assembling method, the assembling method restores a construction scene in the design stage, the supporting frame is split into two parts during design, the part welded to the ship body is welded in advance to the segmented preassembling stage, damage to paint is reduced, the construction difficulty is lowered, and the construction efficiency is improved. In addition, the exhaust header is pre-assembled on the platform before being hoisted, part of procedures of manual adjustment through a hoist can be reduced, operation efficiency is improved, meanwhile, the exhaust header and the branch pipe are split, positioning installation of the exhaust header and positioning installation of the main machine can be conducted synchronously, and then the branch pipe is adjusted to be in butt joint with an exhaust outlet of the main machine. The installation operation of the exhaust header is moved forward, and the series operation is changed into the parallel operation, so that the construction period is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a ship exhaust system and its assembly method. Background Technology

[0002] The exhaust manifold is mainly used to connect the exhaust outlet of the main engine of large ships. The main engine of large ships usually has multiple exhaust outlets. At this time, the exhaust manifold is needed to connect and merge multiple interfaces before exhausting outside the ship. The support frame is used to support and fix the exhaust manifold.

[0003] like Figure 1 As shown, the exhaust manifold 2 is typically located to the upper right of the main engine 1 and below the detachable plate 4. The detachable plate 4 is located directly above the main engine 1 and is an opening area reserved for hoisting the main engine 1. The main engine is usually hoisted during the dock phase, while the exhaust manifold and support frame can only be hoisted after the main engine is loaded onto the ship; otherwise, it will affect the hoisting of the main engine. Therefore, the exhaust manifold and support frame are also constructed during the dock phase. Furthermore, the exhaust manifold is usually about 4-6 meters away from the platform, which is considered high-altitude work. The current construction process is as follows: first, the main engine 1 is hoisted into the hold; then, the support frame 3 is spot-welded to the longitudinal bulkhead 5; then, the exhaust manifold 2 is temporarily placed on the support frame 3 and secured with multiple hoists; then, the detachable plate 4 is hoisted; next, the main engine 1 is positioned and installed. Only after the main engine 1 is positioned and installed can the position of the exhaust manifold branch pipe interface be determined, thereby determining the accurate position of the exhaust manifold 2. Then, the positions of the exhaust manifold 2 and the support frame 3 are manually adjusted using hoists. Next, the support frame 3 is welded and polished, and finally, the exhaust manifold 2 is fixed on the support frame 3.

[0004] The existing operating methods for the aforementioned exhaust manifold and support frame have the following drawbacks:

[0005] First, the exhaust manifold is installed in mid-air, and manual adjustment is required using a hoist during hoisting. The front-to-back and left-to-right movement of the exhaust manifold cannot be well controlled, and the accuracy of the exhaust manifold cannot be guaranteed.

[0006] Secondly, the construction and installation of exhaust manifolds require multiple people to coordinate their work simultaneously, constantly changing the position of the hoists to adjust the displacement, resulting in low work efficiency.

[0007] Third, the final positioning welding of the support frame is carried out after the exhaust manifold branch pipe is connected to the main engine, i.e., during the dock stage. This will damage the paint on the hull structure and require paint repair.

[0008] Fourth, the exhaust manifold can only be assembled after the main engine positioning and installation work is completed. The delay in the operation phase affects the ship's production and construction cycle. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a ship exhaust system and assembly method. During the design phase, the construction scenario is recreated, and the support frame is divided into two parts. The part to be welded to the hull is pre-welded during the segmented pre-assembly stage, reducing damage to the paint and lowering construction difficulty. Furthermore, the exhaust manifold is pre-assembled on a platform before hoisting, reducing the need for manual adjustments using hoists and improving work efficiency. Simultaneously, the exhaust manifold and branch pipes are separated, allowing the positioning and installation of the exhaust manifold to be carried out simultaneously with the main engine's positioning and installation. Later, by adjusting the position of the branch pipes and connecting them to the main engine's exhaust outlet, the installation of the exhaust manifold is moved forward, changing from a series operation to a parallel operation, significantly saving construction time.

[0010] In view of the above-mentioned disadvantages of the prior art, the present invention provides a ship exhaust device, the ship exhaust device includes a support frame, the support frame includes a first support frame and a second support frame, the first support frame includes two parallel longitudinal plates, the sides of the longitudinal plates are fixed with elbow plates for reinforcement, the rear edge of the longitudinal plates is fixedly connected to the longitudinal bulkhead, the front edges of the two longitudinal plates are connected by a first panel and a second panel, the first panel is located below the second panel and in front of the second panel, the front side of the second panel is also fixed with a horizontally arranged baffle, the second panel, the longitudinal plates and the baffle are perpendicular to each other;

[0011] The second support frame includes two trapezoidal skeletons arranged in parallel. The rear ends of the two trapezoidal skeletons are connected by a first connecting plate and a second connecting plate. The first connecting plate is located below and in front of the second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the first panel and the second panel. The second connecting plate is located on the upper surface of the baffle. The upper surfaces of the two trapezoidal skeletons are connected by a support skeleton. The support skeleton includes mutually perpendicular reinforcing plates. The upper surface of the support skeleton is covered with a support panel.

[0012] Optionally, the ship's exhaust system also includes an exhaust manifold and branch pipes. Multiple branch pipes, which connect to the exhaust outlet of the main engine, are connected in parallel to the wall of the exhaust manifold via a saddle, thereby converging the exhaust gases from multiple exhaust outlets of the main engine into the exhaust manifold. One end of the exhaust manifold is equipped with a manhole cover for construction personnel to enter and exit the exhaust manifold for work. The end of the exhaust manifold away from the manhole cover is connected in sequence to an exhaust bend and an exhaust straight pipe via an expansion joint to form an exhaust manifold assembly. The end of the exhaust straight pipe is used to connect to the exhaust outlet of the main engine, and an insulating protective ring is fitted on the outer wall of the exhaust bend.

[0013] Optionally, an exhaust pipe bracket is welded to the outer wall of the exhaust manifold and exhaust bend, and the exhaust pipe bracket is connected to the support panel of the second support frame by bolts.

[0014] Optionally, the exhaust pipe bracket includes an arc-shaped plate that contacts the outer wall of the pipe and a connecting plate that connects to the support panel. The arc-shaped plate and the connecting plate are connected by a connecting frame. The connecting frame includes vertical connecting plates and horizontal connecting plates that are perpendicular to each other. Elbow plates are provided on both sides of the connecting frame.

[0015] The present invention also provides a method for assembling a ship exhaust system, comprising the following steps:

[0016] S1. The design end splits the support frame into a first support frame and a second support frame, which are shown in different manufacturing and installation drawings.

[0017] The support frame includes a first support frame and a second support frame. The first support frame includes two parallel longitudinal plates. The sides of the longitudinal plates are reinforced with elbow plates. The rear edge of the longitudinal plates is fixedly connected to the longitudinal bulkhead. The front edges of the two longitudinal plates are connected by a first panel and a second panel. The first panel is located below the second panel and in front of the second panel. A horizontally arranged baffle is also fixed to the front side of the second panel. The second panel, the longitudinal plates and the baffle are perpendicular to each other.

[0018] The second support frame includes two trapezoidal skeletons arranged in parallel. The rear ends of the two trapezoidal skeletons are connected by a first connecting plate and a second connecting plate. The first connecting plate is located below and in front of the second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the first panel and the second panel. The second connecting plate is located on the upper surface of the baffle. The upper surfaces of the two trapezoidal skeletons are connected by a support skeleton. The support skeleton includes mutually perpendicular reinforcing plates. The upper surface of the support skeleton is covered with a support panel.

[0019] S2. The design separates the exhaust manifold from the branch pipes. Multiple branch pipes used to connect to the exhaust outlet of the main unit are connected in parallel to the wall of the exhaust manifold through the saddle seat, thereby gathering the exhaust gas from multiple exhaust outlets of the main unit into the exhaust manifold.

[0020] Optionally, the following steps may also be included:

[0021] S3. A manhole cover is added to the end face of the exhaust manifold; a manhole cover is provided at one end of the exhaust manifold for construction personnel to enter and exit the exhaust manifold for work.

[0022] S4. Exhaust manifold, support frame, expansion joint, branch pipe, and insulating ring are pre-assembled on the platform;

[0023] The end of the exhaust manifold away from the manhole cover is connected to the exhaust bend and the exhaust straight pipe in sequence via an expansion joint to form an exhaust manifold assembly. The outer wall of the exhaust bend is fitted with an insulating protective ring. Exhaust pipe brackets are welded to the outer walls of the exhaust manifold and the exhaust bend. The exhaust pipe brackets are connected to the support panel of the second support frame by bolts.

[0024] S5. Hoist the main unit into the cabin. Steps S4 and S5 can be performed in parallel.

[0025] Optionally, the following steps may also be included:

[0026] S6. Hoist the pre-assembled exhaust manifold assembly onto the ship, using the baffle added to the support frame as the hoisting stop point and as a temporary resting point for the exhaust manifold; at the same time, begin the main engine positioning operation.

[0027] S7. Detachable plates are hoisted onto the ship, and the main engine is positioned and installed simultaneously.

[0028] S8. Positioning and installation of the exhaust manifold assembly, while simultaneously positioning and installation of the main unit;

[0029] S9. Positioning and installation of the branch pipe, installation of the manhole cover, and complete connection with the exhaust outlet of the main unit.

[0030] Optionally, the exhaust pipe bracket includes an arc-shaped plate that contacts the outer wall of the pipe and a connecting plate that connects to the support panel. The arc-shaped plate and the connecting plate are connected by a connecting frame. The connecting frame includes vertical connecting plates and horizontal connecting plates that are perpendicular to each other. Elbow plates are provided on both sides of the connecting frame.

[0031] As described above, the present invention provides a ship exhaust device and assembly method. The assembly method recreates the construction scenario during the design phase. The support frame is split into two parts during the design phase. The part to be welded to the hull is pre-welded in the segmented pre-assembly stage, which reduces damage to the paint and reduces construction difficulty. In addition, the exhaust manifold is pre-assembled on the platform before hoisting, which can reduce some of the manual adjustment process by hoist and improve work efficiency. At the same time, the exhaust manifold and the branch pipe are separated, so the positioning and installation of the exhaust manifold can be carried out simultaneously with the positioning and installation of the main engine. Later, by adjusting the position of the branch pipe and connecting it with the exhaust outlet of the main engine, the installation operation of the exhaust manifold is moved forward, changing from a series operation to a parallel operation, which greatly saves the construction period. Attached Figure Description

[0032] Figure 1 The diagram shown is a schematic of a support frame structure in the prior art.

[0033] Figure 2 The diagram shown is a schematic of the support frame installation in this invention.

[0034] Figure 3 The diagram shown is a schematic representation of the overall structure of the support frame in this invention.

[0035] Figure 4 The diagram shown is a schematic representation of the overall structure of the first support frame in this invention.

[0036] Figure 5 The diagram shown is a schematic representation of the overall structure of the second support frame in this invention.

[0037] Figure 6 The diagram shown is a side view of the first support frame structure in this invention.

[0038] Figure 7 The diagram shown is a front view of the first support frame in this invention.

[0039] Figure 8 The diagram shown is a side view of the second support frame structure in this invention.

[0040] Figure 9 The diagram shown is a rear view of the second support frame structure in this invention.

[0041] Figure 10 The diagram shown is a top view of the second support frame in this invention.

[0042] Figure 11 The diagram shows the connection between the exhaust manifold and the branch pipe in this invention.

[0043] Figure 12 This diagram illustrates the connection between the exhaust pipe bracket and the exhaust manifold in this invention.

[0044] Figure 13 The diagram shown is a front view of the exhaust pipe bracket in this invention.

[0045] Figure 14 The diagram shown is a bottom view of the exhaust pipe bracket in this invention.

[0046] Figure 15 The diagram shown is a schematic diagram of the assembly and control of the ship exhaust system in this invention.

[0047] Component designation explanation

[0048] Support frame 3, first support frame 31, second support frame 32, longitudinal plate 31a, elbow plate 31b, longitudinal bulkhead 5, first panel 31c, second panel 31d, protective ring 31e, baffle 33, trapezoidal frame 32a, first connecting plate 32b, second connecting plate 32c, reinforcing plate 32d, support panel 32e, oval bolt hole 34, exhaust manifold 2, branch pipe 6, saddle seat 61, manhole cover 7, expansion joint 8, exhaust bend 62, exhaust straight pipe 63, insulating protective ring 21, exhaust pipe bracket 22, arc plate 22g, connecting plate 22f, connecting longitudinal plate 22a, connecting transverse plate 22b, elbow plate 22c, main unit 1, detachable plate 4, detachable plate weld 41. Detailed Implementation

[0049] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0050] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0051] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0052] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0053] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0054] This invention provides a method for assembling a ship exhaust system, comprising the following steps:

[0055] S1. The design end splits the support frame 3 into the first support frame 31 and the second support frame 32, which appear in different manufacturing and installation drawings.

[0056] like Figures 2 to 5As shown, the support frame 3 includes a first support frame 31 and a second support frame 32. The first support frame 31 includes two parallel longitudinal plates 31a. The sides of the longitudinal plates 31a are reinforced by elbow plates 31b. The rear edge of the longitudinal plates 31a is fixedly connected to the longitudinal bulkhead 5. The front edges of the two longitudinal plates 31a are connected by a first panel 31c and a second panel 31d. The first panel 31c is located below the second panel 31d and in front of the second panel 31d. A horizontally arranged baffle 33 is also fixed to the front side of the second panel 31d. The second panel 31d, the longitudinal plates 31a and the baffle 33 are perpendicular to each other.

[0057] The second support frame 32 includes two parallel trapezoidal frames 32a. The rear ends of the two trapezoidal frames 32a are connected by a first connecting plate 32b and a second connecting plate 32c. The first connecting plate 32b is located below the second connecting plate 32c and in front of the second connecting plate 32c. The first connecting plate 32b and the second connecting plate 32c are respectively connected to the first panel 31c and the second panel 31d. The second connecting plate 32c is located on the upper surface of the baffle 33. The upper surfaces of the two trapezoidal frames 32a are connected by a support frame, which includes mutually perpendicular reinforcing plates 32d. The upper surface of the support frame is covered with a support panel 32e.

[0058] Specifically, such as Figure 6 , Figure 7As shown, the first support frame 31 includes two longitudinal plates 31a, six elbow plates 31b, a first panel 31c, a second panel 31d, and a baffle 33. A protective ring 31e is provided inside the longitudinal plate 31a. During the fabrication of the support frame 31, the above-mentioned components are first cut out according to the required dimensions. Then, the two longitudinal plates and six elbow plates are placed on a horizontal surface to form a frame structure. Dimensions A1, A2, and A4 are measured with a tape measure, with an accuracy controlled within 2mm. The frame is then welded. Next, the two protective rings are inserted into the openings in the longitudinal plates, centered, and welded. Then, the opening dimensions B1, B2, B3, and B4 on the first panel 31c and the second panel 31d are measured with a tape measure, with an accuracy controlled within 2mm. Finally, the first panel 31a is assembled according to the dimensions. c. The second panel 31d is installed on the frame structure. The accuracy of B5 and B6 is controlled within 2mm. The levelness of the first panel 31c and the second panel 31d is measured with a spirit level to ensure that the upper edges of the first panel 31c and the second panel 31d are parallel to the ground. After assembly, the first panel 31c and the second panel 31d are welded to the frame structure. Finally, according to dimension A3, the baffle 33 is installed on the second panel 31d with an accuracy controlled within 2mm. After assembly, the baffle 33 is welded to complete the fabrication of the first support frame 31. When the first support frame 31 is pre-installed on the longitudinal bulkhead 5 in the segmentation stage, the installation position of the first support frame 31 is measured with a tape measure according to the dimensions on the drawing, while controlling the accuracy of up, down, left, and right to within 2mm. After positioning, it is welded to the longitudinal bulkhead 5.

[0059] The second support frame 32 comprises a trapezoidal skeleton 32a composed of eleven channel steels, a first connecting plate 32b, a second connecting plate 32c, a reinforcing plate 32d, and a support panel 32e, as shown below. Figures 8 to 10As shown. When manufacturing the second support frame 32, first cut out the aforementioned components according to the required dimensions. Measure the opening dimensions E1, E2, E3, E4, E5, and E6 on the support panel 32e using a measuring tape, ensuring the accuracy is within 2mm. Place the support panel 32e on a horizontal surface, then install the reinforcing plates 32d on the support panel 32e, ensuring they are evenly distributed and do not obstruct the openings. After welding, install the eleven channel steels to form a trapezoidal frame 32a. Measure the dimensions E7, C2, C3, and C4 using a measuring tape, ensuring the accuracy is within 2mm. Then measure the first connecting... The opening dimensions D1, D2, D3, and D4 on the connecting plate 32b and the second connecting plate 32c are controlled within 2mm. Then, according to the dimensions C1, D5, and D6, the first connecting plate 32b and the second connecting plate 32c are installed at the rear end of the trapezoidal frame 32a. The accuracy of C1, D5, and D6 is controlled within 2mm. The verticality of the first connecting plate 32b and the second connecting plate 32c is measured with a level to ensure that they are perpendicular to the ground after installation. After assembly, the first connecting plate 32b and the second connecting plate 32c are welded to the trapezoidal frame 32a to complete the fabrication of the second support frame 32.

[0060] The purpose of splitting the support frame 3 into two parts in this step is to allow the first support frame 31 to be welded to the longitudinal bulkhead 5 in advance during the pre-assembly stage, reducing the damage to the paint caused by welding during the dock stage. Secondly, the addition of a baffle 33 on the first support frame 31 can serve as a hoisting stop point when the exhaust manifold is hoisted down as a whole, which plays a good role in controlling the accuracy of the suspended installation of the exhaust manifold. In addition, the bolt holes of the first panel 31c and the second panel 31d on the first support frame 31 are optimized into oval bolt holes 34. The purpose is to compensate for the accuracy deviation when there is an error in the combined installation of the first support frame 31 and the exhaust manifold.

[0061] Next, in step S2, the exhaust manifold 2 and branch pipe 6 are separated in the design phase to generate separate manufacturing drawings;

[0062] Multiple branch pipes 6 used to connect the exhaust outlet of the main unit are connected in parallel to the pipe wall of the exhaust manifold 2 through the saddle seat 61, thereby converging the exhaust gas from the multiple exhaust outlets of the main unit into the exhaust manifold 2.

[0063] Specifically, the original design shipped the exhaust manifold 2 and branch pipe 6 as a single unit. This application, however, separates them into exhaust manifold 2 and branch pipe 6, and adds a saddle seat 61. After separation, the positioning and installation of the exhaust manifold 2 can be carried out simultaneously with the positioning and installation of the main unit. After the main unit is positioned and installed, only the connection between the branch pipe 6 and the main unit's exhaust outlet needs to be adjusted. To facilitate the adjustment of the branch pipe 6, the radius of the opening at the connection between the branch pipe 6 and the exhaust manifold 2 is increased by 50mm, and the end of the branch pipe 6 extends 100mm into the exhaust manifold 2. This allows the branch pipe 6 to be adjusted vertically, horizontally, and backwards. After the branch pipe 6 is adjusted, the opening on the exhaust manifold 2 is covered by the saddle seat 61, and the assembly and welding are completed. Figure 11 As shown.

[0064] The branch pipe 61 has been optimized from the original design and the overall design of the exhaust manifold 2 to a separate design. The purpose is: 1. In this way, the installation of the exhaust manifold can be carried out without being affected by the installation progress of the main unit, and the series operation can be carried out in parallel to achieve synchronous operation. 2. When there is a deviation between the installation accuracy of the main unit and the installation accuracy of the exhaust manifold, the accuracy error can be eliminated by the branch pipe and the saddle seat. The cumulative error can be eliminated when the branch pipe and the saddle seat are positioned and installed.

[0065] Next, proceed to step S3: design the addition of a manhole cover at the end face of the exhaust manifold;

[0066] One end of the exhaust manifold 2 is provided with a manhole cover 7. Since the branch pipe 6 and the exhaust manifold 2 were separated in step S2, after the exhaust manifold 2 is positioned and installed, it is necessary to enter the exhaust manifold to assemble and weld the branch pipe 6 and the saddle seat 61. Therefore, a manhole cover 7 is added to the end of the exhaust manifold 2 for construction personnel to enter and exit the exhaust manifold 2 for work.

[0067] Next, step S4 is performed, where the exhaust manifold, support frame, expansion joint, branch pipe, and insulating ring are pre-assembled on the platform.

[0068] like Figure 12 As shown, the end of the exhaust manifold 2 furthest from the manhole cover 7 is connected in sequence to the exhaust bend 62 and the exhaust straight pipe 63 via an expansion joint 8, forming an exhaust manifold assembly. An insulating protective ring 21 is fitted onto the outer wall of the exhaust bend 62. An exhaust pipe bracket 22 is welded to the outer wall of the exhaust manifold 2 and the exhaust bend 62. The exhaust pipe bracket 22 is bolted to the support panel 32e of the second support frame 32. The exhaust pipe bracket 22 includes an arc-shaped plate 22g that contacts the outer wall of the pipe and a connecting plate 22f that connects to the support panel 32e. The arc-shaped plate 22g and the connecting plate 22f are connected by a connecting frame, which includes mutually perpendicular connecting longitudinal plates 22a and connecting transverse plates 22b. Elbow plates 22c are provided on both sides of the connecting frame. The main unit has three exhaust outlets: two connecting branch pipes 6 and one connecting exhaust straight pipe 63.

[0069] Specifically, the exhaust manifold is pre-assembled on the platform before being hoisted onto the ship. First, the expansion joint 8 is bolted to the exhaust manifold 2, then the exhaust bend 62 is bolted to the expansion joint 8, and the expansion joint 8 is temporarily reinforced to form the exhaust manifold assembly. The exhaust pipe bracket 22 is assembled and welded to the exhaust manifold assembly, and then the second support frame 32 is bolted to the exhaust pipe bracket 22 (the first support frame 31 has been installed in the segmented pre-assembly stage, and the pre-assembly of the exhaust manifold does not include the first support frame 31). Then, the manhole cover 7 is temporarily installed, the branch pipe 6 is spot-welded to the exhaust manifold 2, and the exhaust bend 62 and the exhaust straight pipe 63 are spot-welded. Finally, the insulating protective ring 21 is assembled and welded to the exhaust manifold assembly.

[0070] The exhaust pipe bracket 22 comprises three connecting longitudinal plates 22a, four connecting transverse plates 22b, two elbow plates 22c, an arc-shaped plate 22g, and a connecting flat plate 22f. Figure 13 , Figure 14 As shown. When manufacturing the exhaust pipe bracket 22, first cut out the aforementioned components according to the required dimensions. Measure the opening dimensions F1, F2, F3, F4, F5, F6, and F7 on the connecting plate 22f using a tape measure, ensuring the accuracy is within 2mm. Place the connecting plate 22f on a horizontal surface. Then, install three connecting longitudinal plates 22a and four connecting transverse plates 22b on the connecting plate 22f, evenly distributing them so as not to block the openings. Measure dimensions G1, G2, and G3 using a tape measure, ensuring the accuracy is within 2mm. After assembly, weld and fix the components. The arc shape of the outer arc plate 22g is made according to the outer arc of the exhaust manifold. Then, the arc plate 22g is installed on the connecting longitudinal plate 22a and the connecting transverse plate 22b. The fit of the arc plate 22g is measured using an arc template, with an accuracy controlled within 2mm. Finally, two elbow plates 22c are installed on both sides. After assembly, the connections between the arc plate 22g and the connecting longitudinal plate 22a, connecting transverse plate 22b, and elbow plates 22c are welded together. The connection between the elbow plates 22c and the connecting transverse plate 22b is also welded together, completing the fabrication of the exhaust pipe bracket 22. This application, through the pre-assembly of the exhaust manifold, changes the process from loose hoisting in the dock to pre-assembly of the platform assembly, allowing for a single hoisting operation, saving the number of dock hoisting operations and the significant amount of scaffolding and installation time required later.

[0071] like Figure 15 As shown, when the exhaust pipe bracket 22 is installed on the exhaust manifold assembly, the dimensions H1, H2, H3, and H4 are measured with a tape measure, and the accuracy is controlled within 5mm. The exhaust pipe bracket 22 below the exhaust manifold is installed directly below the exhaust manifold assembly, and the exhaust pipe bracket 22 above the exhaust manifold is installed directly above the exhaust manifold assembly. After assembly, the exhaust pipe bracket 22 is welded and fixed to the exhaust manifold assembly.

[0072] Next, proceed to step S5, hoisting the main unit into the cabin. Steps S4 and S5 can be performed in parallel.

[0073] The main engine is hoisted onto the ship, and the pre-assembly of the exhaust manifold can begin before the main engine hoisting. The pre-assembly of the exhaust manifold should be completed simultaneously with the main engine hoisting. Steps S4 and S5 are performed in parallel, which can effectively shorten the shipbuilding cycle. Separating the main engine hoisting and exhaust manifold operations facilitates parallel work. Previously, the operations were sequential, with the exhaust manifold hoisted after the main engine. Now, with parallel operations, the pre-assembly of the exhaust manifold can significantly reduce the time required for later dockside installation.

[0074] Next, proceed to step S6, hoisting the pre-assembled exhaust manifold assembly onto the ship. The baffle added to the support frame serves as the hoisting stop point and a temporary resting point for the exhaust manifold. At the same time, the main engine positioning operation can begin.

[0075] The pre-assembled exhaust manifold assembly is hoisted onto the ship. The original method involved preliminary positioning of the exhaust manifold during hoisting, but it was difficult to control the accuracy of the exhaust manifold's position during the hoisting and lowering process. The new method adds a baffle 33 as a hoisting stop point, providing the construction personnel with a clear location and allowing the exhaust manifold to be hoisted into place quickly. At the same time, the baffle 33 provides temporary support, making it convenient for the construction personnel to connect the second support frame 32 to the first support frame 31 with bolts.

[0076] Next, proceed to step S7: hoist the detachable plate onto the ship and perform positioning and welding installation of the detachable plate.

[0077] The detachable plate 4 is hoisted onto the ship, and positioning welding is performed on the detachable plate 4 to form the detachable plate weld 41. At the same time, the main engine 1 is positioned and installed.

[0078] Next, proceed with step S8, positioning and installing the exhaust manifold assembly, while simultaneously positioning and installing the main unit.

[0079] For the positioning and installation of the exhaust manifold assembly, oval bolt holes 34 are pre-designed on the first support frame 31, such as... Figure 4 As shown, this facilitates the adjustment of the installation position when positioning the exhaust manifold assembly. In the original method, the final positioning and installation of the exhaust manifold was carried out after the main engine positioning and installation were completed, which was a delayed phase of the operation. With the new method, the positioning and installation of the exhaust manifold assembly can be carried out after it is hoisted, and can be carried out simultaneously with the positioning and installation of the main engine, which can also effectively shorten the ship production and construction cycle.

[0080] Next, proceed with step S9: positioning and installing the branch pipe, installing the manhole cover, and fully connecting it to the exhaust outlet of the main unit.

[0081] After the main unit is positioned and installed, adjust the position of the branch pipe 6 to ensure it is fully connected to the main unit's exhaust outlet. Increase the radius of the opening at the connection between the branch pipe 6 and the exhaust manifold 2 by 50mm, and extend the end of the branch pipe 6 into the exhaust manifold 2 by 100mm to eliminate errors. Adjust the position of the exhaust straight pipe 63 to ensure it is fully connected to the main unit's exhaust outlet (the main unit has 3 exhaust outlets, 2 of which are connected to the branch pipe 6, and 1 is connected to the exhaust straight pipe 63). Connect the exhaust straight pipe 63 to the exhaust bend pipe 62 with a sleeve to eliminate errors. Complete the positioning and welding work of the branch pipe 6, the saddle seat 61, and the exhaust pipe 63. Finally, complete the installation of the manhole cover 7.

[0082] Based on the above construction method, this application also provides a ship exhaust device, including a support frame, which includes a first support frame 31 and a second support frame 32. The first support frame 31 includes two parallel longitudinal plates 31a. Elbow plates 31b are fixed to the sides of the longitudinal plates 31a for reinforcement. The rear edge of the longitudinal plates 31a is fixedly connected to the longitudinal bulkhead 5. The front edges of the two longitudinal plates 31a are connected by a first panel 31c and a second panel 31d. The first panel 31c is located below the second panel 31d and in front of the second panel 31d. A horizontally arranged baffle 33 is also fixed to the front side of the second panel 31d. The second panel 31d, the longitudinal plates 31a and the baffle 33 are perpendicular to each other.

[0083] The second support frame 32 includes two parallel trapezoidal frames 32a. The rear ends of the two trapezoidal frames 32a are connected by a first connecting plate 32b and a second connecting plate 32c. The first connecting plate 32b is located below the second connecting plate 32c and in front of the second connecting plate 32c. The first connecting plate 32b and the second connecting plate 32c are respectively connected to the first panel 31c and the second panel 31d. The second connecting plate 32c is located on the upper surface of the baffle 33. The upper surfaces of the two trapezoidal frames 32a are connected by a support frame, which includes mutually perpendicular reinforcing plates 32d. The upper surface of the support frame is covered with a support panel 32e.

[0084] The ship's exhaust system also includes an exhaust manifold 2 and branch pipes 6. Multiple branch pipes 6, which are used to connect to the exhaust outlet of the main engine, are connected in parallel to the wall of the exhaust manifold 2 through a saddle seat 61, thereby converging the exhaust gas from multiple exhaust outlets of the main engine into the exhaust manifold 2. One end of the exhaust manifold 2 is provided with a manhole cover 7 for construction personnel to enter and exit the exhaust manifold 2 for work. The end of the exhaust manifold 2 away from the manhole cover 7 is connected in sequence to an exhaust bend 62 and an exhaust straight pipe 63 through an expansion joint 8 to form an exhaust manifold assembly. The end of the exhaust straight pipe 63 is used to connect to the exhaust outlet of the main engine, and an insulating protective ring 21 is fitted on the outer wall of the exhaust bend 62.

[0085] Exhaust pipe brackets 22 are welded to the outer walls of exhaust manifold 2 and exhaust bend 62. Exhaust pipe brackets 22 are bolted to the support panel 32e of the second support frame 32. Exhaust pipe brackets 22 include an arc plate 22g that contacts the outer wall of the pipe and a connecting plate 22f that connects to the support panel 32e. The arc plate 22g and the connecting plate 22f are connected by a connecting frame. The connecting frame includes a connecting longitudinal plate 22a and a connecting transverse plate 22b that are perpendicular to each other. Elbow plates 22c are provided on both sides of the connecting frame.

[0086] In summary, this invention provides a ship exhaust system and assembly method. This assembly method recreates the construction scenario during the design phase, splitting the support frame into two parts during the design phase. The part to be welded to the hull is pre-welded during the segmented pre-assembly stage, reducing damage to the paint and lowering construction difficulty. Furthermore, the exhaust manifold is pre-assembled on a platform before hoisting, reducing some manual adjustments using hoists and improving work efficiency. Simultaneously, the exhaust manifold and branch pipes are separated, allowing the positioning and installation of the exhaust manifold to be synchronized with the main engine's positioning and installation. Later, by adjusting the branch pipe position and connecting it to the main engine's exhaust outlet, the installation of the exhaust manifold is moved forward, changing from a series operation to a parallel operation, significantly saving construction time.

[0087] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A marine exhaust system, characterized in that, The ship exhaust system includes a support frame, which includes a first support frame and a second support frame. The first support frame includes two parallel longitudinal plates. The sides of the longitudinal plates are reinforced with elbow plates. The rear edge of the longitudinal plates is fixedly connected to the longitudinal bulkhead. The front edges of the two longitudinal plates are connected by a first panel and a second panel. The first panel is located below the second panel and in front of the second panel. A horizontally arranged baffle is also fixed to the front side of the second panel. The second panel, the longitudinal plates, and the baffle are perpendicular to each other. The second support frame includes two trapezoidal skeletons arranged in parallel. The rear ends of the two trapezoidal skeletons are connected by a first connecting plate and a second connecting plate. The first connecting plate is located below and in front of the second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the first panel and the second panel. The second connecting plate is located on the upper surface of the baffle. The upper surfaces of the two trapezoidal skeletons are connected by a support skeleton. The support skeleton includes mutually perpendicular reinforcing plates. The upper surface of the support skeleton is covered with a support panel.

2. The ship exhaust system according to claim 1, characterized in that: The ship's exhaust system also includes an exhaust manifold and branch pipes. Multiple branch pipes, which connect to the exhaust outlet of the main engine, are connected in parallel to the wall of the exhaust manifold via a saddle, thereby collecting the exhaust gases from multiple exhaust outlets of the main engine into the exhaust manifold. One end of the exhaust manifold is equipped with a manhole cover for construction personnel to enter and exit the exhaust manifold for work. The end of the exhaust manifold away from the manhole cover is connected in sequence to an exhaust bend and an exhaust straight pipe via an expansion joint to form an exhaust manifold assembly. The end of the exhaust straight pipe is used to connect to the exhaust outlet of the main engine, and the outer wall of the exhaust bend is fitted with an insulating protective ring.

3. The marine exhaust system according to claim 2, characterized in that: The outer wall of the exhaust manifold and exhaust bend is welded with an exhaust pipe bracket, which is connected to the support panel of the second support frame by bolts.

4. The marine exhaust system according to claim 3, characterized in that: The exhaust pipe bracket includes an arc-shaped plate that contacts the outer wall of the pipe and a connecting plate that connects to the support panel. The arc-shaped plate and the connecting plate are connected by a connecting frame. The connecting frame includes vertical connecting plates and horizontal connecting plates that are perpendicular to each other. Elbow plates are provided on both sides of the connecting frame.

5. A method for assembling a ship exhaust system, characterized in that, Includes the following steps: S1. The design end splits the support frame into a first support frame and a second support frame, which are shown in different manufacturing and installation drawings. The support frame includes a first support frame and a second support frame. The first support frame includes two parallel longitudinal plates. The sides of the longitudinal plates are reinforced with elbow plates. The rear edge of the longitudinal plates is fixedly connected to the longitudinal bulkhead. The front edges of the two longitudinal plates are connected by a first panel and a second panel. The first panel is located below the second panel and in front of the second panel. A horizontally arranged baffle is also fixed to the front side of the second panel. The second panel, the longitudinal plates and the baffle are perpendicular to each other. The second support frame includes two trapezoidal frames arranged in parallel. The rear ends of the two trapezoidal frames are connected by a first connecting plate and a second connecting plate. The first connecting plate is located below the second connecting plate and in front of the second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the first panel and the second panel. The second connecting plate is located on the upper surface of the baffle. The upper surfaces of the two trapezoidal frames are connected by a supporting frame, which includes mutually perpendicular reinforcing plates, and the upper surface of the supporting frame is covered with a supporting panel. S2. The design separates the exhaust manifold from the branch pipes. Multiple branch pipes used to connect to the exhaust outlet of the main unit are connected in parallel to the wall of the exhaust manifold through the saddle seat, thereby gathering the exhaust gas from multiple exhaust outlets of the main unit into the exhaust manifold.

6. The assembly method of the ship exhaust system according to claim 5, characterized in that, It also includes the following steps: S3. A manhole cover is added to the end face of the exhaust manifold; a manhole cover is provided at one end of the exhaust manifold for construction personnel to enter and exit the exhaust manifold for work. S4. Exhaust manifold, support frame, expansion joint, branch pipe, and insulating ring are pre-assembled on the platform; The end of the exhaust manifold away from the manhole cover is connected to the exhaust bend and the exhaust straight pipe in sequence via an expansion joint to form an exhaust manifold assembly. The outer wall of the exhaust bend is fitted with an insulating protective ring. Exhaust pipe brackets are welded to the outer walls of the exhaust manifold and the exhaust bend. The exhaust pipe brackets are connected to the support panel of the second support frame by bolts. S5. Hoist the main unit into the cabin. Steps S4 and S5 can be performed in parallel.

7. The assembly method of the ship exhaust system according to claim 6, characterized in that, It also includes the following steps: S6. Hoist the pre-assembled exhaust manifold assembly onto the ship, using the baffle added to the support frame as the hoisting stop point and as a temporary resting point for the exhaust manifold; at the same time, begin the main engine positioning operation. S7. Detachable plates are hoisted onto the ship, and the main engine is positioned and installed simultaneously. S8. Positioning and installation of the exhaust manifold assembly, while simultaneously positioning and installation of the main unit; S9. Positioning and installation of the branch pipe, installation of the manhole cover, and complete connection with the exhaust outlet of the main unit.

8. The assembly method of the ship exhaust system according to claim 6, characterized in that: The exhaust pipe bracket includes an arc-shaped plate that contacts the outer wall of the pipe and a connecting plate that connects to the support panel. The arc-shaped plate and the connecting plate are connected by a connecting frame. The connecting frame includes vertical connecting plates and horizontal connecting plates that are perpendicular to each other. Elbow plates are provided on both sides of the connecting frame.

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