A marine engineering thick plate weld rapid preheating device

Abstract

The utility model discloses a kind of marine engineering thick plate weld rapid preheating device, marine engineering structure thick plate weld rapid preheating device is used to preheat the weld position of thick plate, marine engineering structure thick plate weld rapid preheating device includes main pipe and multiple sub-pipes, wherein, mixed gas is arranged in main pipe;Multiple sub-pipes are connected in parallel in main pipe, multiple gun heads are arranged on each sub-pipe, gun head can output mixed gas as preheating flame, the gun head on adjacent sub-pipe can output preheating flame to the both sides of weld position, for preheating weld position.The marine engineering structure thick plate weld rapid preheating device is heated by multiple gun heads double-side synchronously, solve traditional single-head bake handle temperature uneven problem, reduce weld pore and crack defect.Parallel sub-pipe design expands preheating area, shortens preheating time, applicable to 38mm above thick plate (such as 1.2-3m length thick plate);Main pipe-sub-pipe integrated design reduces gas delivery loss, improves heat energy utilization.

Description

Technical Field

[0001] This utility model belongs to the field of marine engineering equipment, and in particular relates to a rapid preheating device for thick plate welds in marine engineering. Background Technology

[0002] All high-end equipment structures in marine engineering are constructed using welding. Before the commencement of a project, welding procedure qualification experiments are conducted. After the welded test pieces pass non-destructive and destructive testing, a welding procedure qualification procedure is formed and submitted to the project owner for approval before being put into use on the construction site.

[0003] Currently, the welding test specimens for thick plate structures are welded using CO2 and submerged arc welding processes, with preheating using a single-head heating torch. This method suffers from several drawbacks: the large thickness results in a heavy welding workload, and the long preheating time leads to poor preheating effectiveness. During welding, workers operate in high-temperature environments, their work clothes soaked with sweat, and the air filled with the smell of burning metal. Uneven temperature during welding can cause tiny internal defects that are difficult to detect with the naked eye, ultimately affecting the project's commencement status.

[0004] Therefore, there is an urgent need to design a rapid preheating device for thick plate welds in marine engineering to solve the problems mentioned above. Utility Model Content

[0005] To address the technical problem of uneven temperature during thick plate welding mentioned in the background art, a rapid preheating device for thick plate welds in marine engineering is provided.

[0006] To achieve the above objectives, the specific technical solution of this utility model for a rapid preheating device for thick plate welds in marine engineering is as follows:

[0007] A rapid preheating device for thick plate welds in marine engineering, used for preheating the weld area of ​​thick plates, comprising:

[0008] The main pipe contains a mixture of gases.

[0009] Multiple secondary pipes are connected in parallel to the main pipe. Each secondary pipe is equipped with multiple nozzles. The nozzles can output the mixed gas as a preheating flame. The nozzles on adjacent secondary pipes can output the preheating flame to both sides of the weld position for preheating the weld position.

[0010] Furthermore, it also includes a fixing mechanism, which can be clamped to the opposite sides of the thick plate so that the rapid preheating device for weld seams of structural thick plates for marine engineering is fixed relative to the thick plate.

[0011] Furthermore, the fixing mechanism includes a support rod and a clamping bracket. One end of the support rod is fixedly mounted on the secondary pipe, and the other end abuts against the side of the thick plate near the main pipe. The clamping bracket is mounted on the main pipe and clamps against the side of the thick plate away from the main pipe, so as to cooperate with the support rod to fix the rapid preheating device for welded thick plates of marine engineering structures relative to the thick plate.

[0012] Furthermore, the clamping bracket is L-shaped, with one end fixed to the main pipe and the inner side of the other end abutting against the side of the thick plate away from the main pipe, so as to clamp and fix the thick plate with the supporting rod.

[0013] Furthermore, at least one support rod is provided, which is disposed between adjacent nozzles, and one of the support rods is located near the connection between the main tube and the auxiliary tube.

[0014] Furthermore, multiple secondary pipes are connected in parallel with the main pipe at equal intervals, and adjacent secondary pipes and the main pipe form a U-shaped or inverted U-shaped structure.

[0015] Furthermore, there are two secondary pipes, which are located at both ends of the main pipe, forming a U-shaped or inverted U-shaped structure between the two secondary pipes and the main pipe.

[0016] Furthermore, it also includes a gas delivery device, which is used to supply mixed gas to the main pipe. The output end of the gas delivery device is equipped with a gas delivery pipe, which is connected to the main pipe via an adapter.

[0017] Furthermore, a switch is installed between the gas transmission device and the main pipe. The switch is mounted on the main pipe and is used to connect or disconnect the gas transmission device from the main pipe.

[0018] Furthermore, the distance between the nozzle and the thick plate is 15-25cm, and the distance between the tip of the preheating flame and the thick plate is 0-15cm.

[0019] This utility model of a rapid preheating device for welded seams of structural thick plates used in marine engineering has the following advantages: This device solves the problem of uneven temperature in traditional single-head heating by using multiple nozzles for simultaneous heating on both sides, thus reducing weld porosity and crack defects. The parallel auxiliary pipe design expands the preheating area and shortens the preheating time, making it suitable for plates thicker than 38mm (e.g., plates 1.2-3m in length). The integrated design of the main and auxiliary pipes reduces gas transport losses and improves thermal energy utilization. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of the rapid preheating device for welded thick plates used in marine engineering according to this utility model.

[0021] Figure 2 This is a top view of the rapid preheating device for weld seams of thick structural plates used in marine engineering according to this utility model.

[0022] Explanation of markings in the diagram:

[0023] 11. Main pipe; 12. Secondary pipe; 2. Nozzle; 3. Adapter; 4. Support rod; 5. Clamping bracket; 6. Gas supply pipe; 7. Switch; 8. Thick plate. Detailed Implementation

[0024] 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0026] The following is a reference to the appendix. Figure 1 To be continued Figure 2 This invention describes a rapid preheating device for thick plate welds in marine engineering.

[0027] Figure 1 This is a schematic diagram of the rapid preheating device for welded thick plates used in marine engineering, as shown in this embodiment. Figure 2 This is a top view of the rapid preheating device for welded thick plates used in marine engineering, as described in this embodiment.

[0028] This embodiment provides a rapid preheating device for thick plate welds in marine engineering, such as... Figure 1 and Figure 2 As shown, the rapid preheating device for weld seams of thick structural plates used in marine engineering is used to preheat the weld seam of thick plate 8. The rapid preheating device for weld seams of thick structural plates used in marine engineering includes a main pipe 11 and multiple auxiliary pipes 12. The main pipe 11 contains a mixed gas. Multiple auxiliary pipes 12 are connected in parallel to the main pipe 11. Each auxiliary pipe 12 is equipped with multiple nozzles 2. The nozzles 2 can output the mixed gas as a preheating flame. The nozzles 2 on adjacent auxiliary pipes 12 can output the preheating flame to both sides of the weld seam for preheating the weld seam.

[0029] This rapid preheating device for thick plate welds in marine engineering solves the problem of uneven temperature caused by traditional single-head heating by using multiple nozzles (2) for simultaneous heating on both sides, thus reducing weld porosity and crack defects. The parallel auxiliary pipe (12) design expands the preheating area and shortens the preheating time, making it suitable for plates thicker than 38mm (e.g., 1.2-3m long plates). The integrated design of the main pipe (11) and auxiliary pipe (12) reduces gas transport losses and improves thermal energy utilization.

[0030] Furthermore, the rapid preheating device for welded thick plates in marine engineering also includes a fixing mechanism. The fixing mechanism can be clamped on opposite sides of the thick plate 8 so that the rapid preheating device for welded thick plates in marine engineering is fixed relative to the thick plate 8.

[0031] Understandably, the fixing mechanism can prevent the device from shifting during the preheating operation, ensuring that the preheating area accurately covers the weld. At the same time, the fixing mechanism can fix the rapid preheating device for welds of thick plates used in marine engineering to horizontal or vertical thick plates (such as steel structures of offshore platforms), meeting the needs of complex working conditions.

[0032] Furthermore, such as Figure 1 As shown, the fixing mechanism includes a support rod 4 and a clamping bracket 5. One end of the support rod 4 is fixedly mounted on the secondary pipe 12, and the other end abuts against the side of the thick plate 8 near the main pipe 11. The clamping bracket 5 is mounted on the main pipe 11 and clamps against the side of the thick plate 8 away from the main pipe 11, so as to cooperate with the support rod 4 to fix the rapid preheating device for welded thick plates of marine engineering structures relative to the thick plate 8.

[0033] Understandably, the clamping design of the support rod 4 and the clamping bracket 5 can maintain the mechanical balance of the pressure plate and prevent it from tipping over. It is especially suitable for high-altitude or inclined operations. In addition, the clamping design of the support rod 4 and the clamping bracket 5 allows workers to quickly assemble and disassemble the plate without additional tools during preheating operations, thereby improving construction efficiency.

[0034] Furthermore, the clamping bracket 5 is L-shaped. One end of the L-shaped clamping bracket 5 is fixedly mounted on the main pipe 11, and the inner side of the other end abuts against the side of the thick plate 8 away from the main pipe 11, so as to clamp and fix the thick plate 8 with the support rod 4.

[0035] In this embodiment, as Figure 1 As shown, the pressure plate has a square structure, and the L-shaped corner fits into the edge of the square thick plate 8 to enhance friction. The L-shaped clamping bracket 5 can be adapted to thick plates 8 of different thicknesses (such as 38-100mm), making the fixing mechanism more versatile.

[0036] Furthermore, at least one support rod 4 is provided, which is disposed between adjacent gun heads 2, and one of the support rods 4 is located near the connection between the main tube 11 and the secondary tube 12.

[0037] Understandably, the support point is close to the area of ​​concentrated stress to reduce the risk of deformation of the main tube 11; and it does not obstruct the flame path of the nozzle 2 to ensure uniform preheating.

[0038] Specifically, in this embodiment, as follows: Figure 1 and Figure 2 As shown, there are two support rods 4, which are respectively positioned near the two ends of the secondary tube 12 to support the thick plate 8 at different positions, thus ensuring the stability of the thick plate 8.

[0039] Furthermore, such as Figure 2 As shown, multiple secondary pipes 12 are connected in parallel with the main pipe 11 at equal intervals, and adjacent secondary pipes 12 and the main pipe 11 form a U-shaped or inverted U-shaped structure.

[0040] Specifically, there are two secondary pipes 12, which are located at both ends of the main pipe 11, forming a U-shaped or inverted U-shaped structure between the two secondary pipes 12 and the main pipe 11.

[0041] It is understandable that the double-sided gun head 2 surrounds the weld seam to eliminate deformation caused by unilateral thermal stress (such as welding of the thick plate 8 of the hull).

[0042] In this embodiment, a U-shape is formed between the two secondary pipes 12 and the main pipe 11, wherein the U-shaped structure is suitable for long straight welds; in other embodiments, a U-shape is formed between the two secondary pipes 12 and the main pipe 11, wherein the inverted U-shape is suitable for preheating of the pipe circumferential weld. Therefore, in actual operation, the operator can choose the appropriate setting method according to the actual situation, and no specific limitation is made here.

[0043] Furthermore, the rapid preheating device for welded thick plates in marine engineering also includes a gas supply device, which is used to supply mixed gas to the main pipe 11. The output end of the gas supply device is provided with a gas supply pipe 6, which is connected to the main pipe 11 via an adapter 3.

[0044] Understandably, adapter 3 reduces gas leakage and ensures combustion efficiency; it also allows for quick switching of gas sources (such as propane / natural gas) to adapt to different process requirements.

[0045] Furthermore, a switch 7 is provided between the gas transmission device and the main pipe 11. The switch 7 is installed on the main pipe 11 and is used to connect or disconnect the gas transmission device from the main pipe 11.

[0046] Understandably, switch 7 enables the gas supply device to cut off the gas source immediately to prevent backfire or accidental ignition. In addition, the structure of switch 7 allows experienced personnel to accurately control the preheating time and reduce gas waste (saving more than 400,000 yuan in costs per year).

[0047] Furthermore, the distance between the nozzle 2 and the thick plate 8 is 15-25cm, and the distance between the tip of the preheating flame and the thick plate 8 is 0-15cm.

[0048] Understandably, a 15-25cm distance ensures a moderate depth of the heat-affected zone, preventing overheating and oxidation of the thick plate and making the preheating temperature more controllable; a 0-15cm flame length optimizes heat transfer efficiency and reduces heat loss from the environment.

[0049] The working principle of this rapid preheating device for welded seams of thick structural plates used in marine engineering is as follows:

[0050] First, the device is fixed to the thick plate 8 by the clamping bracket 5, the gas supply device provides mixed gas, and the adapter 3 connects the gas supply device to the main pipe 11.

[0051] Next, switch 7 is turned on, which introduces the mixed gas into the main pipe 11. The main pipe 11 then transfers the mixed gas to the secondary pipe 12, causing multiple nozzles 2 on the secondary pipe 12 to emit flames, thereby preheating the thick plate 8.

[0052] Those skilled in the art will understand that the flames emitted by the multiple secondary pipes 12 can increase the heated area at the weld, improve the preheating effect, achieve temperature control during welding, reduce the probability of weld porosity defects, and continuously improve the internal welding quality of the weld.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rapid preheating device for thick plate welds in marine engineering, used for preheating the weld seam of thick plates, characterized in that, include: The main pipe contains a mixture of gases. Multiple secondary pipes are connected in parallel to the main pipe. Each secondary pipe is equipped with multiple nozzles. The nozzles can output the mixed gas as a preheating flame. The nozzles on adjacent secondary pipes can output the preheating flame to both sides of the weld position for preheating the weld position.

2. The rapid preheating device for thick plate welds in marine engineering according to claim 1, characterized in that, It also includes a fixing mechanism, which can be clamped to the opposite sides of the thick plate to fix the rapid preheating device for welded thick plates for marine engineering relative to the thick plate.

3. The rapid preheating device for thick plate welds in marine engineering according to claim 2, characterized in that, The fixing mechanism includes a support rod and a clamping bracket. One end of the support rod is fixedly mounted on the secondary pipe, and the other end abuts against the side of the thick plate near the main pipe. The clamping bracket is mounted on the main pipe and clamps against the side of the thick plate away from the main pipe, so as to cooperate with the support rod to fix the rapid preheating device for welded thick plates of marine engineering structures relative to the thick plate.

4. The rapid preheating device for thick plate welds in marine engineering according to claim 3, characterized in that, The clamping bracket is L-shaped. One end of the L-shaped clamping bracket is fixed to the main pipe, and the inner side of the other end abuts against the side of the thick plate away from the main pipe, so as to clamp and fix the thick plate with the support rod.

5. The rapid preheating device for thick plate welds in marine engineering according to claim 3, characterized in that, At least one support rod is provided, which is located between adjacent nozzles, and one of the support rods is located near the connection between the main tube and the auxiliary tube.

6. The rapid preheating device for thick plate welds in marine engineering according to claim 1, characterized in that, Multiple secondary pipes are connected in parallel with the main pipe at equal intervals, and adjacent secondary pipes and the main pipe form a U-shaped or inverted U-shaped structure.

7. The rapid preheating device for thick plate welds in marine engineering according to claim 6, characterized in that, There are two secondary pipes, which are located at both ends of the main pipe, forming a U-shaped or inverted U-shaped structure between the two secondary pipes and the main pipe.

8. The rapid preheating device for thick plate welds in marine engineering according to claim 1, characterized in that, It also includes a gas delivery device, which is used to supply mixed gas to the main pipe. The gas delivery device has a gas delivery pipe at its output end, and the gas delivery pipe is connected to the main pipe via an adapter.

9. The rapid preheating device for thick plate welds in marine engineering according to claim 8, characterized in that, A switch is also installed between the gas transmission device and the main pipe. The switch is installed on the main pipe and is used to connect or disconnect the gas transmission device from the main pipe.

10. The rapid preheating device for thick plate welds in marine engineering according to any one of claims 1-9, characterized in that, The distance between the nozzle and the thick plate is 15-25cm, and the distance between the tip of the preheating flame and the thick plate is 0-15cm.

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