Marine engine frame assembling and welding method and auxiliary tool

Abstract

The invention relates to the technical field of engine manufacturing, in particular to a marine engine rack assembling and welding method and an auxiliary tool. The method comprises the following steps: sequentially standing and assembling web plates on a bottom plate of a rack and fixing by spot welding; mounting an auxiliary tool; the two ends of an adjusting rod are fixed to the two adjacent web plates correspondingly, and the top span size and perpendicularity of the web plates are sequentially adjusted through the adjusting rod; the side plates and the top plate of the rack are sequentially assembled, and the sizes among the web, the side plates and the top plate are adjusted and fixed through positioned welding; and the adjusting rod and the auxiliary tool are detached, and the auxiliary tool is taken out from the side face hole of the rack. The problems that in the prior art, potential safety hazards of climbing operation are large, the position and size of a web are difficult to adjust, and the production efficiency is low due to the fact that tools are inconvenient to remove are solved, and therefore safe, efficient and accurate rack assembling and welding are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine preparation, and in particular to a marine engine rack assembly welding method and auxiliary tooling. BACKGROUND

[0002] The marine engine rack is a key load-bearing component of the engine, as shown in the accompanying drawings, and its structure generally includes a bottom plate, a top plate, a side plate, and 6 to 9 webs, with a total height of up to 3 meters or more. Figure 1 During assembly, the webs are sequentially erected on the bottom plate and welded in place, and then the side plate and top plate are installed to form a semi-enclosed box-type structure.

[0003] Currently, during the rack assembly process, due to the large height of the webs and the narrow operating space, the operator needs to use auxiliary devices such as ladders or stools to adjust the position and perform positioning welding.

[0004] The height of the ladder or stool must be close to the total height of the rack, and the weight is large and difficult to move. When the worker climbs to the designated height, there is a lack of stable support, and accidents such as slipping or falling are likely to occur. SUMMARY

[0005] To address the deficiencies in the prior art, the embodiments of the present application provide a marine engine rack assembly welding method to solve the problems of high safety risks in climbing operations, difficulties in adjusting the position and size of the webs, and low production efficiency due to the inconvenience of removing the tooling, thereby achieving safe, efficient, and precise rack assembly welding.

[0006] To achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions: In a first aspect, the embodiments of the present application provide a marine engine rack assembly welding method, comprising the following steps: sequentially erecting and assembling the webs on the bottom plate of the rack and spot welding them in place; installing auxiliary tooling, which includes a hanging beam and a bearing table, the hanging beam being hung on the top of the web, and the bearing table being installed at the bottom of the hanging beam as an operating table; fixing the two ends of the adjusting rod on two adjacent webs, respectively, and using the adjusting rod to sequentially adjust the top gauge size and perpendicularity of the webs; sequentially assembling the side plate and top plate of the rack, adjusting the size between the webs, side plate, and top plate, and positioning and welding them in place; Remove the adjusting rod and auxiliary tooling, and take the auxiliary tooling out through the side hole of the frame.

[0007] As a further technical solution, the web plate on one side is used as the zero-point reference for assembly, and the web plates are assembled sequentially according to the dimensions in the drawings and the amount of process shrinkage.

[0008] As a further technical solution, when assembling the web plates, the spacing between each web plate is set to a predetermined amount of welding shrinkage.

[0009] As a further technical solution, when installing the hanging beam, the mounting part of the hanging beam is attached to the top of the web plate, and the fixing bolts are installed on the mounting part so that the inner end of the fixing bolts abuts against the web plate.

[0010] Secondly, embodiments of the present invention also provide an auxiliary tooling for the aforementioned marine engine frame assembly and welding method, including a hanging beam and a support platform; The top of the hanging beam has a mounting part, which is attached to the top of the web plate; The support platform has a footboard, which is detachably installed at the bottom of the hanging beam and serves as an operating platform for the operator.

[0011] As a further technical solution, the mounting part is an L-shaped structure, including a crossbeam and a vertical rod. The two ends of the crossbeam are connected to the body of the vertical rod and the hanging beam, respectively. The crossbeam is perpendicular to the body of the hanging beam, and the vertical rod is parallel to the body of the hanging beam. The vertical rod, the crossbeam, and the body of the hanging beam form a channel, which is hung on the top of the web.

[0012] As a further technical solution, the vertical rod is provided with a threaded hole for installing a fixing bolt, the inner end of which abuts against the web plate.

[0013] As a further technical solution, the support platform also includes a support frame, which is detachably installed at the bottom of the hanging beam, and the pedal is installed on the support frame.

[0014] As a further technical solution, the support frame has two sets, which are located on both sides of the hanging beam. Each set of support frames includes a horizontal brace and a diagonal brace, and the horizontal brace and diagonal brace are connected to the hanging beam by a fixing pin.

[0015] As a further technical solution, the auxiliary tooling also includes an adjusting rod, which includes an adjusting sleeve and two adjusting rods. The outer ends of the two adjusting rods are respectively welded to two adjacent webs, and the inner ends of the two adjusting rods are threadedly connected to the adjusting sleeve, with the two threads having opposite directions of rotation.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: This method involves sequentially assembling the web plates upright on the base plate and spot-welding them in place. This establishes the initial position of each web plate on the base plate. The auxiliary tooling's hanging beam is directly attached to the top of the web plates instead of being placed on the ground. A support platform is installed at the bottom of the hanging beam, serving as the operator's work platform. Operators can reach the top working area without using tall ladders or stools. Furthermore, because the hanging beam is connected to the top of the web plates, it does not occupy internal floor space within the frame. More importantly, it reduces the overall length, allowing the auxiliary tooling to be removed directly from the side openings of the frame without waiting for a crane to lift it from the top. The two ends of an adjusting rod are fixed to two adjacent web plates, and the top spacing and verticality of the web plates are adjusted sequentially using the adjusting rod, providing both rigid support and dimensional control. In this method, the hanging beam's attachment method and the feasibility of side removal are interrelated. Because the hanging beam does not rely on ground support, its length or height can be reduced, allowing it to be removed directly from the side openings of the frame without needing to be lifted from the top. This eliminates the waiting time for crane-assisted tooling removal and improves production efficiency.

[0017] Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the dimensions or spacing between the components are exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0019] Figure 1 This is a schematic diagram of the engine frame provided in an embodiment of the present invention; Figure 2 This is a flowchart of the welding method provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the auxiliary tooling provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the hanging beam being attached to the web plate according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the connection between the support platform and the hanging beam provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the auxiliary tooling in use according to an embodiment of the present invention; In the diagram: 1. Frame; 11. Top plate; 12. Web plate; 13. Bottom plate; 14. Side plate; 2. Hanging beam; 21. Crossbeam; 22. Vertical bar; 3. Support platform; 31. Step; 32. Horizontal brace; 33. Diagonal brace; 4. Fixing bolt; 5. Fixing pin; 6. Adjusting rod; Detailed Implementation To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0020] Generally speaking, the terms "comprising" and "including" only indicate that the steps and elements are explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements.

[0021] Example 1 like Figure 1 The image shown is a schematic diagram of the engine frame.

[0022] like Figure 2 As shown, in a typical embodiment of this disclosure, a method for assembling and welding a marine engine frame is provided, comprising the following steps: The web plates are then assembled vertically onto the base plate of the frame and spot-welded in place. The auxiliary installation fixture includes a hanging beam and a support platform. The hanging beam is attached to the top of the web plate, and the support platform is installed at the bottom of the hanging beam as an operating platform. Fix both ends of the adjusting rod to two adjacent web plates respectively, and use the adjusting rod to adjust the top spacing and verticality of the web plates in turn; Assemble the side plates and top plate of the frame in sequence, adjust the dimensions between the web plate, side plates and top plate and fix them with tack welds; Remove the adjusting rod and auxiliary tooling, and take the auxiliary tooling out through the side hole of the frame.

[0023] This method involves first vertically assembling the web plate onto the base plate and spot welding it in place, ensuring the initial stability of the web plate's position. The auxiliary fixture uses a combination of a hanging beam and a support platform. The hanging beam is directly attached to the top of the web plate, and the support platform is installed at the bottom of the hanging beam to form an operating platform, replacing traditional ground-based climbing devices and adapting to the semi-enclosed, confined working space of the machine frame. Adjusting rods connect adjacent web plates and adjust the top spacing and verticality, reducing assembly errors. After the side plates and top plate are assembled, they are fixed with tack welding to ensure overall structural dimensional stability. Due to the short length of the auxiliary fixture, it can be directly removed from the side openings of the machine frame after disassembly, eliminating the need for hoisting operations and reducing operational difficulty.

[0024] In some specific examples disclosed herein, the web is assembled sequentially according to the dimensions in the drawings and the amount of shrinkage during the manufacturing process, using one side of the web as the assembly reference.

[0025] In actual production, large machine frames have a large number of web plates. If each web plate is positioned independently, the error will be significant. Using one web plate as a zero-point reference establishes a unified measurement starting point. The assembly position of each subsequent web plate is determined sequentially from this reference, reducing errors. Simultaneously, process shrinkage is considered, i.e., allowance is made for material shrinkage after welding, ensuring that the actual dimensions after welding are close to the theoretical dimensions on the drawings.

[0026] In some specific examples of this disclosure, when assembling the webs, the spacing between each web is set to a predetermined amount of weld shrinkage.

[0027] Specifically, when setting the spacing size, the assembly is not directly based on the theoretical dimensions of the drawings. Instead, a predetermined value is added to the theoretical dimensions. This predetermined value is used to compensate for the size reduction caused by the cooling and shrinkage of the weld during the subsequent welding process. Finally, the spacing size of the welded frame can meet the requirements of the drawings.

[0028] In some specific examples disclosed herein, when installing the hanging beam, the mounting part of the hanging beam is attached to the top of the web plate, and the fixing bolts are installed on the mounting part so that the inner end of the fixing bolts abuts against the web plate.

[0029] Because different machine models have different web plate thicknesses, simply relying on the hanging beam's own groove for connection will create gaps when the web plate thickness is less than the groove width, leading to instability of the hanging beam. By tightening the fixing bolts so that the inner end of the bolts abuts against the side of the web plate, the hanging beam can be firmly fixed to the top of the web plate. The same set of hanging beams can adapt to web plates of different thicknesses, achieving the versatility of modular tooling.

[0030] The specific welding process: 1. Using web plate #1 as the assembly zero-point reference, assemble the web plates sequentially onto base plate 13 according to the dimensions in the drawings and the process shrinkage allowance, and fix them by spot welding. The spacing between each web plate should include a 1.5mm welding shrinkage allowance. Figure 4As shown.

[0031] 2. Install the hanging beam onto the top of the web plate. Depending on the web plate thickness of different models, use fixing bolts to secure the hanging beam to the web plate to prevent movement or loosening. Install the support platform into the mounting holes of the hanging beam and secure it with four fixing pins. For example... Figure 4 , Figure 5 As shown.

[0032] 3. Use the adjusting rod to adjust the top spacing and verticality of the web plate in sequence to meet the requirements of the drawings and process.

[0033] 4. Assemble the side plates 14 and top plate 11 in sequence. Workers stand on the auxiliary device to adjust the dimensions between the web, side plates, and top plate and perform tack welding for fixation. Figure 6 As shown.

[0034] 5. After the frame assembly welding is completed, disassemble the auxiliary devices and adjusting rods, and conduct dimensional inspection. After passing the inspection, proceed to the next process.

[0035] Example 2 This embodiment provides an auxiliary tooling for the assembly and welding method of the marine engine frame 1 as described in Embodiment 1, such as... Figure 3 As shown, it includes a hanging beam 2 and a support platform 3; The top of the hanging beam 2 has a mounting part, which is attached to the top of the web plate 12; The support platform 3 has a footboard 31, which is detachably installed at the bottom of the hanging beam 2 and serves as an operating platform for the operator.

[0036] The core of this fixture lies in the connection between the hanging beam 2 and the top of the web plate 12. This allows the load of the entire fixture to be directly transferred to the web plate 12, rather than the ground. Therefore, the height of the fixture does not need to reach the total height of the frame 1 like a ladder; a local operating platform can be provided on the top of the web plate 12. The footboard 31 is detachable for easy disassembly and storage after use.

[0037] In some specific examples of this disclosure, the mounting part is an L-shaped structure, including a crossbeam 21 and a vertical rod 22. The two ends of the crossbeam 21 are connected to the vertical rod 22 and the body of the hanging beam 2, respectively. The crossbeam 21 is perpendicular to the body of the hanging beam 2, and the vertical rod 22 is parallel to the body of the hanging beam 2. The vertical rod 22, the crossbeam 21 and the body of the hanging beam 2 form a channel, which is hung on the top of the web plate 12.

[0038] The main body of the hanging beam 2 extends roughly vertically. A crossbeam 21 extends horizontally outward from the top of the main body of the hanging beam 2, and a vertical rod 22 extends vertically downward from the outer end of the crossbeam 21, thus forming a downward-opening U-shaped or groove-shaped space between the hanging beam 2 and the main body of the hanging beam 2. After installation, the main body of the hanging beam 2 and the vertical rod 22 are located on opposite sides of the web 12, while the crossbeam 21 rests on the top surface of the web 12. This structure is simple, achieving connection solely through gravity, without the need for complex clamping mechanisms.

[0039] In some further specific examples of this disclosure, the vertical rod 22 is provided with a threaded hole for installing a fixing bolt 4, the inner end of which abuts against the web plate 12.

[0040] The vertical rod 22 is located on one side of the web 12, and the main body of the hanging beam 2 is located on the other side of the web 12. The fixing bolt 4 is screwed into the threaded hole on the vertical rod 22, and the inner end passes through the vertical rod 22 and contacts the side of the web 12. By continuing to tighten, the web 12 is pressed firmly onto the main body of the hanging beam 2, so that the hanging beam 2 will not wobble on the top of the web 12. At the same time, due to the self-locking effect between the bolt and the threaded hole, the hanging beam 2 will not loosen when bearing the weight of the operator and the working load.

[0041] In some specific examples of this disclosure, the support platform 3 further includes a support frame, which is detachably mounted on the bottom of the hanging beam 2, and the pedal 31 is mounted on the support frame.

[0042] The support frame distributes the force on the pedal 31, improving the load-bearing capacity and structural rigidity of the operating platform. Its detachable connection facilitates quick assembly and disassembly on-site. The support frame, in conjunction with the hanging beam 2 and the support platform 3, enhances platform stability while maintaining a lightweight design.

[0043] In some further specific examples of this disclosure, the support frame has two sets, which are located on both sides of the hanging beam 2. Each set of support frames includes a horizontal brace 32 and a diagonal brace 33, and both the horizontal brace 32 and the diagonal brace 33 are connected to the hanging beam 2 by a fixing pin 5.

[0044] Each set of diagonal braces 33, together with the horizontal braces 32 and the hanging beam 2, forms a triangular structure, utilizing the stability of the triangle to improve load-bearing capacity. Both the horizontal braces 32 and diagonal braces 33 are connected to the hanging beam 2 via fixing pins 5, allowing for tool-free installation and disassembly, simplifying operation. Each set of horizontal braces 32 and diagonal braces 33 forms two insertion points, for a total of four insertion points, ensuring stability while facilitating installation. The four insertion points are evenly distributed on both sides of the hanging beam 2, preventing the support platform 3 from easily tipping over even under eccentric loads.

[0045] In some specific examples of this disclosure, the auxiliary tooling also includes an adjusting rod 6, which includes an adjusting sleeve and two adjusting rods 6. The outer ends of the two adjusting rods 6 are respectively welded to two adjacent web plates 12, and the inner ends of the two adjusting rods 6 are threadedly connected to the adjusting sleeve, and the two threads have opposite directions of rotation.

[0046] When the adjusting sleeve is rotated, the two adjusting rods 6 will simultaneously retract into the adjusting sleeve or extend outward due to the opposite directions of the threads at both ends, thereby changing the total length of the adjusting rods 6. The welding of the outer end to the web plate 12 is a temporary spot weld, which can be removed after the dimensional adjustment is completed. This structure allows the adjusting rods 6 to act as both a support to push the two web plates 12 outward and a tie rod to pull the two web plates 12 inward, thereby precisely controlling the spacing dimension at the top of the web plates 12. At the same time, since the adjusting rods 6 are connected to the top of the web plates 12, when the length of the adjusting rods 6 is fixed, it can also constrain the relative position between the two web plates 12, preventing the web plates 12 from deforming or shifting during subsequent welding.

[0047] In summary, this invention, employing specialized auxiliary devices and tools, overcomes the limitations of existing technologies and addresses issues such as low production efficiency and high safety risks. It significantly improves the assembly accuracy of the web plate 12 and top plate 11, avoids cumulative errors, ensures product quality, enables safe welding of the frame 1 group, reduces worker workload, and improves the workers' working environment. Furthermore, the modular tooling design makes it suitable for different machine models, facilitating tooling handling, use, and storage.

[0048] While the specific embodiments of the present invention have been described above, they are not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for assembling and welding a marine engine frame, characterized in that, Includes the following steps: The web plates are then assembled vertically onto the base plate of the frame and spot-welded in place. The auxiliary installation fixture includes a hanging beam and a support platform. The hanging beam is attached to the top of the web plate, and the support platform is installed at the bottom of the hanging beam as an operating platform. Fix both ends of the adjusting rod to two adjacent web plates respectively, and use the adjusting rod to adjust the top spacing and verticality of the web plates in turn; Assemble the side plates and top plate of the frame in sequence, adjust the dimensions between the web plate, side plates and top plate and fix them with tack welds; Remove the adjusting rod and auxiliary tooling, and take the auxiliary tooling out through the side hole of the frame.

2. The method for assembling and welding a marine engine frame as described in claim 1, characterized in that, Using one side of the web as the zero-point reference for assembly, assemble the webs sequentially according to the dimensions in the drawings and the amount of shrinkage during the process.

3. The method for assembling and welding a marine engine frame as described in claim 1, characterized in that, When assembling the web plates, the spacing between each web plate is set to a predetermined amount for welding shrinkage.

4. The method for assembling and welding a marine engine frame as described in claim 1, characterized in that, When installing the hanging beam, attach the mounting part of the hanging beam to the top of the web plate, and install the fixing bolts on the mounting part so that the inner end of the fixing bolts abuts against the web plate.

5. An auxiliary tooling for the assembly and welding method of a marine engine frame as described in any one of claims 1-4, characterized in that, Includes hanging beams and support platforms; The top of the hanging beam has a mounting part, which is attached to the top of the web plate; The support platform has a footboard, which is detachably installed at the bottom of the hanging beam and serves as an operating platform for the operator.

6. The auxiliary tooling as described in claim 5, characterized in that, The mounting part has an L-shaped structure, including a crossbeam and a vertical rod. The two ends of the crossbeam are connected to the vertical rod and the body of the hanging beam, respectively. The crossbeam is perpendicular to the body of the hanging beam, and the vertical rod is parallel to the body of the hanging beam. The vertical rod, the crossbeam, and the body of the hanging beam form a channel, which is hung on the top of the web.

7. The auxiliary tooling as described in claim 6, characterized in that, The vertical rod has a threaded hole for installing a fixing bolt, the inner end of which abuts against the web plate.

8. The auxiliary tooling as described in claim 5, characterized in that, The support platform also includes a support frame, which is detachably installed at the bottom of the hanging beam, and the pedal is installed on the support frame.

9. The auxiliary tooling as described in claim 8, characterized in that, The support frame has two sets, which are located on both sides of the hanging beam. Each set of support frames includes a horizontal brace and a diagonal brace, and the horizontal brace and diagonal brace are connected to the hanging beam by a fixing pin.

10. The auxiliary tooling as described in claim 5, characterized in that, The auxiliary tooling also includes an adjusting rod, which includes an adjusting sleeve and two adjusting rods. The outer ends of the two adjusting rods are respectively welded to two adjacent webs, and the inner ends of the two adjusting rods are threadedly connected to the adjusting sleeve, with the two threads having opposite directions of rotation.

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