Underwater welding device for ocean engineering and welding process thereof

Abstract

The invention relates to the related technical field of welding equipment, discloses an underwater welding device for ocean engineering and a welding process thereof, and aims to solve the problem that a welding gun is difficult to stably hold due to water flow disturbance. A marine riser is arranged on the outer side of the welding gun in a sleeving manner and is used for spraying air flow to a to-be-welded position, so that the to-be-welded position is relatively dry; the marine riser can be directly hooked on a pipeline through the traction hook, so that the welding gun can be stably placed at the position to be welded, and welding personnel can hold the welding gun by hand conveniently. The marine riser is driven by the welding handle to rotate, the distance between the welding gun and the pipe fitting can be adjusted, and meanwhile, the positions of the pipe fitting and the welding gun can be adjusted only when the marine riser needs to rotate by a specific angle and a specific path through the reset groove formed in the inner side of the limiting barrel. And it is guaranteed that the distance between the pipe fitting and the welding gun is relatively stable during actual welding of the welding gun.

Description

Technical Field

[0001] This invention relates to the technical field of welding equipment, and in particular to an underwater welding device for marine engineering and its welding process. Background Technology

[0002] In marine engineering, underwater pipelines are crucial transport components used to transport oil, gas, or underwater drinking water. Over extended periods of use, underwater pipelines may experience damage or leaks due to corrosion, wear, or external impacts, necessitating underwater welding for repair.

[0003] Currently, underwater welding mostly employs arc welding, including both dry and wet welding methods. Taking dry welding as an example, to achieve localized pipe repair, a localized inert gas stream needs to be sprayed onto the area to be welded. On one hand, the inert gas stream can push water outwards from the area to be welded, creating a dry zone conducive to welding; on the other hand, during welding, the inert shielding gas stream can form a protective layer covering the arc and molten metal areas, preventing oxidation and nitriding of the weld.

[0004] A search revealed that patent CN104722973B discloses a local dry drainage device and method for an underwater welding robot. This method utilizes the combined action of high-pressure gas injection, a drainage sealing ring, and a one-way valve skirt bushing to squeeze and drain the water around the workpiece to be welded, forming a high-pressure, sealed, locally dry area. This allows underwater welding to achieve the same effect as land-based welding, thus enabling underwater welding of the workpiece.

[0005] This shows that current underwater pipeline welding, especially when using localized dry welding, requires continuous spraying of protective gas into the dry area. However, in practical applications, due to the complex underwater environment, water flow disturbances or the forces generated by the jet gas can make it difficult for welders to maintain stable control of the welding torch. Once the welding torch deviates, it will cause the welding position to shift, thus affecting the final welding result. Summary of the Invention

[0006] This invention proposes an underwater welding device and welding process for marine engineering. The device has the characteristic of being able to hold the welding torch stably, which can effectively solve the problem mentioned in the background art that the welding torch is difficult to hold stably due to water flow disturbance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an underwater welding device for marine engineering, comprising: a welding torch, with a water-proof pipe installed on its side, and a welding handle for easy hand-holding fixedly installed on the side of the water-proof pipe; an air inlet pipe, connected to the water-proof pipe and supplying inert gas flow into the water-proof pipe to dry the base material to be welded; a limiting shaft installed at the end of the water-proof pipe, and the limiting shaft can be movably inserted into a limiting sleeve based on a directional plate fixed at its end; a positioning frame movably installed on the outside of the limiting sleeve, and a support frame movably installed on the top of the positioning frame, with traction hooks symmetrically arranged on the side of the support frame; the traction hooks hook onto the outside of the base material, which can limit the welding torch and the water-proof pipe, reducing the impact of water flow disturbance on the stability of the welding torch.

[0008] Furthermore, a limiting sleeve is fixedly installed on the outside of the limiting shaft, and a limiting top rod is movably installed on the inside of the limiting sleeve, which is pushed by a spring and abuts against the outside of the limiting sleeve.

[0009] Furthermore, a stepped groove is provided on the outer side of the limiting cylinder, with the deep groove serving as the limiting groove and the shallow groove serving as the reset groove. A reset inclined groove is provided at the left end of the reset groove to enable the limiting top rod to move from the limiting groove to the reset groove. A displacement straight groove is provided on the side of the limiting cylinder and at the right end of the limiting groove and the reset groove. A locking inclined groove is provided between the end of the limiting groove and the displacement straight groove.

[0010] Furthermore, both the reset groove and the limiting groove are C-shaped.

[0011] Furthermore, the inner sealing movable sleeve of the water-proof tube is equipped with a detection piston that is pushed towards the welding gun by a spring, and a detection component is fixedly installed on the side of the water-proof tube. When the detection piston reaches the detection component, the welding gun starts to work.

[0012] Furthermore, a drive rod is fixedly installed at the end of the detection piston, and a toothed ring is fixedly installed on the side of the drive rod and sleeved on the outside of the limiting cylinder. The toothed ring is provided with locking teeth on its side. When the limiting rod abuts against the locking teeth, the limiting cylinder and the limiting sleeve rotate synchronously.

[0013] Furthermore, a screw is coaxially fastened to the end of the limiting sleeve, and a positioning slider is movably installed in the positioning frame. The positioning slider is threadedly connected to the screw. A guide frame is fastened to the side of the support frame, and a guide groove is opened in the guide frame. A positioning rod inserted into the guide groove is fixedly connected to the side of the positioning slider.

[0014] Furthermore, a return torsion spring is connected between the end of the screw and the positioning frame.

[0015] Furthermore, when the welding torch is not in operation, the welding torch can be deflected left and right to adjust the distance between the welding torch and the base material; when the welding torch is in operation, the welding torch can be deflected left and right to move along the axial direction of the base material.

[0016] A welding process using an underwater welding device for marine engineering includes the following steps:

[0017] S1. The traction hook is attached to the outside of the base material to achieve relative stability between the welding torch and the base material.

[0018] S2. The welding torch drives the limiting shaft and the limiting cylinder to rotate clockwise. The limiting top rod will move to the left along the limiting groove until the limiting top rod moves to its left end and is located on one side of the reset inclined groove.

[0019] S3. Push the welding torch forward to move the limit rod to the bottom of the reset groove.

[0020] S4. When the water-sealing pipe drives the limiting cylinder to rotate counterclockwise, the limiting top rod can move along the reset inclined groove towards the reset groove.

[0021] S5. After the limiting rod moves along the reset groove, the limiting rod finally enters the transposition straight groove. When the limiting shaft drives the limiting cylinder to move axially, the position adjustment between the welding gun and the base material is realized.

[0022] S6. After the position is adjusted, the limit rod enters the limit groove along the locking groove to lock the distance between the welding torch and the base material.

[0023] The present invention has the following beneficial effects:

[0024] This invention provides an underwater welding device and welding process for marine engineering, which utilizes a water-proof tube sleeved on the outside of the welding torch. During actual welding operations, the water-proof tube can spray airflow towards the welding location. This airflow spraying action can effectively displace water around the welding area, creating a relatively dry welding environment.

[0025] Meanwhile, a traction hook is installed on the riser pipe, allowing welders to easily hook the hook directly onto the pipe to be welded. This design enables the welding torch to be stably positioned in the welding position, providing convenience for welders and allowing them to hold the welding torch more comfortably and stably during welding operations, effectively reducing welding deviations caused by unstable hand grip.

[0026] Furthermore, during the welding process, the welder can rotate the riser by manipulating the welding torch. This rotation allows adjustment of the distance between the welding torch and the pipe to meet different welding scenarios and process requirements. In addition, to further ensure the stability of the distance between the welding torch and the pipe during welding, a limiting cylinder with a reset groove on its inner side is included in the device. When adjustments to the positions of the pipe and welding torch are needed, the riser must rotate along a specific angle and path. Only when these specific conditions are met can the position be adjusted, ensuring that the distance between the pipe and the welding torch remains relatively stable during actual welding operations, providing a strong guarantee for stable underwater welding. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0028] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0029] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0031] Figure 3 For the present invention Figure 2 Enlarged structural diagram of section E in the middle;

[0032] Figure 4 This is a top view schematic diagram of the overall structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the internal three-dimensional structure of the water-proof pipe of the present invention;

[0034] Figure 6 This is a three-dimensional structural diagram of the left end of the limiting groove and the reset groove of the present invention;

[0035] Figure 7 This is a three-dimensional structural diagram of the right end of the limiting groove and the reset groove of the present invention.

[0036] In the diagram: 1. Welding torch; 2. Welding handle; 3. Water-proof pipe; 300. Air inlet pipe; 301. Detection assembly; 4. Limiting sleeve; 401. Limiting top rod; 5. Support frame; 501. Traction hook; 502. Guide frame; 6. Positioning frame; 601. Positioning slider; 602. Positioning rod; 7. Screw; 700. Reset torsion spring; 8. Detection piston; 9. Gear ring; 901. Drive rod; 10. Limiting shaft; 11. Limiting cylinder; 110. Limiting groove; 111. Reset groove; 112. Reset inclined groove; 113. Locking inclined groove; 114. Transposition straight groove; 12. Orientation plate. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1, please refer to Figure 1 and Figure 2 It can be seen that a water-tight pipe 3 is coaxially fastened to the side of the welding torch 1 via a flange, and the end of the welding torch 1 is located near the left opening of the water-tight pipe 3. A welding torch 2, which mates with the welding torch 1, is fixedly installed on the side of the water-tight pipe 3, and the welding torch 2 is used to adjust the position between the welding torch 1 / water-tight pipe 3 and the base material. The welding described in this application is arc welding. In actual application, a sealed wire feeder is used to feed the welding wire from the welding torch 2 to the welding torch 1, and the welding wire contacts the base material (in this application, a pipe, such as...). Figure 4 After (as shown in section A), the tip of the welding wire melts under the heat of the electric arc, forming a molten droplet. The molten droplet transfers to the surface of the base material and together with the molten portion of the base material, forms a molten pool.

[0039] An air inlet pipe 300 is fixedly connected to the outside of the water-proof pipe 3, located on one side of the welding torch 2. The air inlet pipe 300 is connected to an inert gas source. The inert gas is ejected from the opening on the left side of the water-proof pipe 3, which pushes away the water medium at the contact point between the welding torch 1 and the base material. With the continuous output of the inert gas flow, the area becomes relatively dry, which facilitates welding by the welding torch 1.

[0040] During the welding process, the operator needs to hold the welding torch 2 while performing the welding work. Due to the complex factors of the underwater environment, such as water disturbance, instability can occur when the operator holds the welding torch 2. If the welding torch 2 causes the welding gun 1 to shift, the actual welding area will shift, and the welding gun 1 will become misaligned with the area to be welded. Therefore, in order to achieve stable welding of underwater pipelines, this application proposes... Figure 1 , Figure 2 and Figure 5It can be seen that a limiting shaft 10, bolted to the right end of the riser pipe 3, is fixedly installed with a directional disc 12 at the end of the limiting shaft 10 away from the riser pipe 3. Furthermore, a limiting sleeve 4 is movably fitted onto the outer side of the directional disc 12, combined with… Figure 1 , Figure 2 and Figure 4 It can be seen that a positioning bracket 6 is movably mounted on the outer side of the limiting sleeve 4, and a support bracket 5 is movably mounted on the top of the positioning bracket 6. More detailed information can be found from... Figure 1 As can be seen, the outer side of the positioning frame 6 includes two clamps installed on the outer side of the limiting sleeve 4. These clamps cannot move axially along the limiting sleeve 4. The two clamps are connected by plates and locked with bolts to ensure they are always relatively tight. Two round rods are installed on the inner side of the support frame 5. These round rods are movably installed on the outer side of the clamps in the positioning frame 6. The two round rods and the two clamps are installed correspondingly to achieve the movable installation between the positioning frame 6 and the support frame 5. Traction hooks 501 are symmetrically arranged on the side of the support frame 5. Figure 1 and Figure 4 As can be seen, the traction hook 501 can hook onto the outer side of the base material. Figure 4 (At part A), so that the riser 3 is aligned with the outer side of the base material. In actual underwater welding, the traction hook 501 hooked on the base material can play a certain limiting role for the riser 3, thereby reducing water disturbance and causing the relative position of the riser 3 and the base material to change.

[0041] Based on this, Figure 2 and Figure 3 It can be seen that a limiting sleeve 11 is fixedly installed on the outer side of the limiting shaft 10. Correspondingly, a limiting top rod 401, which is pushed by a spring and abuts against the outer side of the limiting sleeve 11, is movably installed on the inner side of the limiting sleeve 4. Furthermore, a ball is movably installed at the end of the limiting top rod 401. Regarding the arrangement of the limiting sleeve 11, combined with... Figures 5-7 It can be seen that a limiting groove 110 is formed on the outer side of the limiting cylinder 11. The limiting groove 110 is C-shaped. When the limiting top rod 401 abuts against the limiting groove 110, it can restrict the axial movement of the limiting cylinder 11 and the limiting shaft 10. A reset groove 111 is formed on the side of the limiting cylinder 11 and on one side of the limiting groove 110. The limiting groove 110 and the reset groove 111 are arranged in a stepped groove form. The depth of the limiting groove 110 is relatively greater than the depth of the reset groove 111. The reset groove 111 and the limiting groove 110 have the same groove shape. Moreover, from Figure 6As can be seen, a reset inclined groove 112 is provided at the left end of the reset groove 111. When the limiting rod 401 moves to the left end of the limiting groove 110, if the limiting cylinder 11 is pushed to move, causing the reset groove 111 to move towards the limiting rod 401, the limiting rod 401 will move to the bottom of the reset inclined groove 112. Then, by rotating the limiting cylinder 11, the limiting rod 401 can move along the reset inclined groove 112 and finally enter the reset groove 111. Combined with... Figure 7 It can be seen that a shifting groove 114 is provided on the side of the limiting cylinder 11, located at the right end of the limiting groove 110 and the reset groove 111, and the shifting groove 114 is parallel to the central axis of the limiting cylinder 11. Furthermore, a locking groove 113 is provided between the end of the limiting groove 110 and the shifting groove 114. A stepped surface is formed between the top of the locking groove 113 and the limiting groove 110, and a stepped surface also exists between the reset groove 111 and the locking groove 113. The purpose of this design is that, by rotating the limiting cylinder 11, the limiting rod 401 can be conveyed into the limiting groove 110 through the locking groove 113, and the limiting rod 401 entering the limiting groove 110 cannot return to the shifting groove 114 through the locking groove 113. Figure 5 As can be seen from the above, there are multiple limiting grooves 110, reset grooves 111 and locking inclined grooves 113, and the multiple limiting grooves 110, reset grooves 111 and locking inclined grooves 113 are arranged at equal intervals. It should be noted that all the limiting grooves 110 and reset grooves 111 share a single transposition straight groove 114.

[0042] In practical applications, when it is necessary to adjust the distance between the welding torch 1 and the base material, it is only necessary to use the water-sealing pipe 3 to control the extension length of the upper limit sleeve 11 of the limiting shaft 10. However, it should be noted that if only the content described in Embodiment 1 is used, the outer side of the limiting sleeve 4 and the clamp need to be relatively fixed.

[0043] The operator rotates the water-tight pipe 3 by using welding handle 2 to... Figure 2 For example, when the water-separating pipe 3 drives the limiting cylinder 11 to rotate clockwise via the limiting shaft 10, the limiting top rod 401 will move to the left along the limiting groove 110 until the limiting top rod 401 moves to its left end and is located on one side of the reset inclined groove 112. Next, according to the forward push of the welding torch 2, the limiting top rod 401 moves to the bottom of the reset inclined groove 112. Then, when the water-separating pipe 3 drives the limiting cylinder 11 to rotate counterclockwise, the limiting top rod 401 can move from the reset inclined groove 112 to the reset groove 111. At this time, it is necessary to maintain the trend of the welding torch 2 always moving away from the limiting sleeve 4, that is, the welding torch 2 always pushes forward.

[0044] After the limiting rod 401 moves along the reset groove 111, the limiting rod 401 eventually enters the transposition straight groove 114. At this time, when the limiting shaft 10 drives the limiting cylinder 11 to move outward along the axial direction, the limiting rod 401 will not prevent the limiting cylinder 11 from moving outward.

[0045] The traction hook 501 is hooked onto the outer side of the base material. Once the welding torch 1 and the water-sealing pipe 3 are close to the outer side of the base material, the welding position is determined. In practical applications, a rubber skirt is also provided on the left end of the water-sealing pipe 3 to adhere to the outer side of the base material, thereby reducing the gap between the water-sealing pipe 3 and the base material. Since the rubber skirt has a certain compression performance, it ensures that when the subsequent limiting rod 401 enters the limiting groove 110, the water-sealing pipe 3 always abuts against the outer side of the base material.

[0046] The welding torch 2 drives the limiting cylinder 11 to rotate clockwise again, causing the limiting rod 401 in the transposition straight groove 114 to enter the limiting groove 110 according to the locking inclined groove 113. At this time, the limiting rod 401 in the limiting groove 110 restricts the limiting cylinder 11 to only rotate circumferentially. Finally, the welding torch 1 welds the base material, and the welding position can be observed using the transparent water-proof tube 3. According to the up and down swing of the welding torch 2, the traction hook 501 can rotate relative to the outside of the base material, so that the welding torch 1 can weld along the outer circumferential direction of the base material; similarly, when the welding torch 2 pushes the welding torch 1 and the water-proof tube 3 to move axially along the base material, the limiting sleeve 4 moves along the support frame 5 through the positioning frame 6, and the welding torch 1 can weld along the outer axial direction of the base material.

[0047] Example 2 is a further improvement on Example 1. Please refer to Example 1. Figure 2 and Figure 5 It can be seen that the inner side of the riser tube 3 is sealed with a detection piston 8 that is pushed towards the welding torch 1 by a spring. A detection component 301, located away from the welding torch 1, is fixedly installed on the side of the riser tube 3. The welding torch 1 can only begin welding when the detection piston 8 reaches the detection component 301. This is because inert airflow is input into the riser tube 3 through the air inlet pipe 300 and ejected from the left side of the riser tube 3. If the end of the riser tube 3 is not obstructed at this time, all the inert airflow in the cavity of the riser tube 3 will be discharged from the left end of the riser tube 3, indicating that the riser tube 3 and the welding torch 1 are not close to the base material. Similarly, if the end of the riser tube 3 is close to the base material, the air discharge from the left side of the riser tube 3 will be relatively obstructed. Subsequently, the pressure inside the riser tube 3 increases relatively, forcing the detection piston 8 to compress the spring and move towards the detection component 301 until the detection component 301 is pressed down, at which point the welding torch 1 begins welding. Welding can only be performed when the water-tight pipe 3 and the welding torch 1 reach the welding area.

[0048] Furthermore, based on the above, the limiting sleeve 4 and the two clamps can move relative to each other. (Combined) Figure 2 , Figure 3 , Figure 6 and Figure 7 It can be seen that a drive rod 901 is fixedly installed at the end of the detection piston 8, and a toothed ring 9 is fixedly installed on the side of the drive rod 901, which is sleeved on the outer side of the limiting cylinder 11. The toothed ring 9 is C-shaped and has locking teeth on its side. When the outer side of the limiting push rod 401 abuts between the two locking teeth, the limiting cylinder 11 can drive the limiting push rod 401 and the limiting sleeve 4 to rotate synchronously through the toothed ring 9. That is, the limiting cylinder 11 can drive the limiting sleeve 4 to rotate synchronously. Figure 1 , Figure 2 and Figure 4 It can be seen that a screw 7 is coaxially fastened to the end of the limiting sleeve 4, and a positioning slider 601 is movably mounted on the plate in the positioning frame 6. The positioning slider 601 is threadedly connected to the screw 7, and the positioning slider 601 can only move left and right along the axial direction of the screw 7 according to the positioning of the plate. A guide frame 502 is fastened to the side of the support frame 5 by bolts, and a guide groove is opened in the guide frame 502 at a 45° angle with the support frame 5. A positioning rod 602 is fixedly connected to the side of the positioning slider 601 and inserted into the guide groove. When the screw 7 rotates, it can drive the positioning slider 601 to move left and right along the plate. When the positioning slider 601 drives the positioning rod 602 to move, the positioning rod 602 abuts against the guide frame 502, forcing the limiting sleeve 4 and the positioning frame 6 to move along the round rod on the support frame 5, that is, the water-stop pipe 3 can move axially along the outer side of the base material.

[0049] In practical applications, the reset torsion spring 700 fixed between the end of the screw 7 and the positioning frame 6 is in a normal uncompressed state. Since the reset torsion spring 700 enables the screw 7 to have a reset function, the reset torsion spring 700 can make the positioning slider 601 in the middle of the screw 7 under normal conditions. At this time, the positioning rod 602 is in the middle of the guide frame 502.

[0050] If the welding torch 1 and the riser tube 3 are not placed on the side of the base material, even if the air inlet pipe 300 supplies inert airflow into the inner cavity of the riser tube 3, it will be discharged directly from the left end of the riser tube 3. During this process, the detection piston 8 is pushed by the spring, moving it away from the detection assembly 301, and the detection piston 8 drives the drive rod 901 to move the toothed ring 9 away from the limiting groove 110. Then, when the welding torch 2 moves the riser tube 3 to deflect and reposition, it is consistent with the description in Embodiment 1, until the welding torch 1 and the riser tube 3 reach the outer side of the base material. Generally, when adjusting the position, stopping the air supply from the air inlet pipe 300 makes it easier for the riser tube 3 to move closer to the side of the base material. In this way, when adjusting the distance between the riser tube 3 and the base material, the distance between the base material and the riser tube 3 can be adjusted according to the left and right deflection of the welding torch 2.

[0051] After the welding torch 1 and the water-proof tube 3 are placed against the side of the base material, an inert airflow is introduced through the air inlet pipe 300 to keep the area of ​​the base material to be welded dry. Simultaneously, the airflow pushes the detection piston 8 and compresses the spring, causing the detection piston 8 to contact the detection assembly 301. The welding torch 1 can then begin welding. At the same time, the detection piston 8, via the drive rod 901, simultaneously pushes the toothed ring 9 towards the limiting groove 110 until the side of the limiting rod 401 abuts against the locking teeth of the toothed ring 9. At this point, the toothed ring 9 and the limiting rod 401 enable the limiting cylinder 11 and the limiting sleeve 4 to rotate synchronously.

[0052] When the welding torch 2 deflects clockwise, the water-cooling pipe 3, through the limiting sleeve 11, can drive the limiting sleeve 4 to rotate synchronously. Simultaneously, the limiting sleeve 4 rotates, causing the screw 7 to rotate synchronously, and the screw 7 simultaneously compresses and stores the return torsion spring 700. During this process, the rotation of the screw 7 causes the positioning slider 601 to move the positioning rod 602 towards the limiting sleeve 4. When the positioning rod 602 moves along the guide frame 502, it causes the positioning frame 6, the limiting sleeve 4, and the water-cooling pipe 3 to move to the left along the round rod on the support frame 5. That is, the welding torch 1 and the water-cooling pipe 3 move axially along the outer side of the base material. Similarly, when the welding torch 2 rotates in the opposite direction, the water-cooling pipe 3 can move axially in another direction along the outer side of the base material. Therefore, it can be seen that by using the method described in this embodiment two, the welding torch 1 can be deflected during welding by turning the welding torch 2, thereby enabling the welding torch 1 to move stably along the outer side of the base material. If the welding torch 2 does not deflect, the welding torch 1 will not easily move axially along the outer side of the base material because the traction hook 501 is hooked on the outer side of the base material.

[0053] Finally, after welding is completed, the screw 7 is subjected to the elastic force of the return torsion spring 700, causing the positioning rod 602 to always tend to return to the middle of the guide frame 502. At the same time, based on the movement of the positioning frame 6 driven by the positioning rod 602, the clamp on the positioning frame 6 always tends to move towards the middle of the round rod. Combined with the threaded connection between the screw 7 and the positioning slider 601, the disturbance of external water flow will not cause the limiting sleeve 4 to move freely along the round rod. Ultimately, this allows the operator to accurately control the welding torch 1 as it moves along the axial direction of the base material, thereby reducing the problem of the welding torch 1 deviating due to water flow disturbance.

Claims

1. An underwater welding device for marine engineering, characterized in that, include: The welding torch (1) has a water-proof tube (3) installed on its side, and a welding handle (2) that is easy to hold is fixedly installed on the side of the water-proof tube (3). The air inlet pipe (300) is connected to the water-proof pipe (3) and delivers inert airflow into the water-proof pipe (3) to dry the part of the base material to be welded; A limiting shaft (10) is installed at the end of the water-proof pipe (3), and the limiting shaft (10) can be movably inserted into the limiting sleeve (4) based on the directional plate (12) fixed at the end; a positioning frame (6) is movably installed on the outside of the limiting sleeve (4), and a support frame (5) is movably installed on the top of the positioning frame (6), and traction hooks (501) are symmetrically arranged on the side of the support frame (5); the traction hooks (501) are hooked on the outside of the base material, which can limit the welding torch (1) and the water-proof pipe (3) and reduce the impact of water flow disturbance on the stability of the welding torch (1).

2. The underwater welding apparatus for marine engineering according to claim 1, characterized in that, A limiting sleeve (11) is fixedly installed on the outside of the limiting shaft (10), and a limiting top rod (401) is movably installed on the inside of the limiting sleeve (4) and pushed by a spring to abut against the outside of the limiting sleeve (11).

3. The underwater welding apparatus for marine engineering according to claim 2, characterized in that, The outer side of the limiting cylinder (11) is provided with a stepped groove, the deep groove is set as the limiting groove (110), the shallow groove is set as the reset groove (111), and the reset inclined groove (112) provided at the left end of the reset groove (111) enables the limiting top rod (401) to move from the limiting groove (110) to the reset groove (111). A transposition groove (114) is provided on the side of the limiting cylinder (11) and at the right end of the limiting groove (110) and the reset groove (111), and a locking groove (113) is provided between the end of the limiting groove (110) and the transposition groove (114).

4. The underwater welding apparatus for marine engineering according to claim 3, characterized in that, Both the reset groove (111) and the limiting groove (110) are C-shaped.

5. The underwater welding apparatus for marine engineering according to claim 1 or 3, characterized in that, The inner side of the water-sealing pipe (3) is fitted with a detection piston (8) that is pushed by a spring towards the welding gun (1), and a detection component (301) is fixedly installed on the side of the water-sealing pipe (3). When the detection piston (8) reaches the detection component (301), the welding gun (1) starts to work.

6. The underwater welding apparatus for marine engineering according to claim 5, characterized in that, A drive rod (901) is fixedly installed at the end of the detection piston (8), and a toothed ring (9) sleeved on the outside of the limiting cylinder (11) is fixedly installed on the side of the drive rod (901). The toothed ring (9) is provided with locking teeth on the side. When the limiting top rod (401) abuts between the locking teeth, the limiting cylinder (11) and the limiting sleeve (4) rotate synchronously.

7. The underwater welding apparatus for marine engineering according to claim 6, characterized in that, A screw (7) is coaxially fastened to the end of the limiting sleeve (4), and a positioning slider (601) is movably installed in the positioning frame (6). The positioning slider (601) is threadedly connected to the screw (7). A guide frame (502) is fastened to the side of the support frame (5), and a guide groove is provided in the guide frame (502). A positioning rod (602) inserted into the guide groove is fixedly connected to the side of the positioning slider (601).

8. The underwater welding apparatus for marine engineering according to claim 7, characterized in that, A reset torsion spring (700) is connected between the end of the screw (7) and the positioning frame (6).

9. The underwater welding apparatus for marine engineering according to claim 7, characterized in that, When the welding torch (1) is not in operation, the welding handle (2) can be deflected left and right to adjust the distance between the welding torch (1) and the base material; When the welding torch (1) is working, the welding handle (2) deflects left and right, which enables the welding torch (1) to move along the axial direction of the base material.

10. A welding process for an underwater welding apparatus for marine engineering as described in claim 3, characterized in that, Includes the following steps: S1. The traction hook (501) is hooked on the outside of the base material to achieve relative stability between the welding gun (1) and the base material. S2. The welding torch (2) drives the limiting shaft (10) and the limiting cylinder (11) to rotate clockwise. The limiting top rod (401) will move to the left along the limiting groove (110) until the limiting top rod (401) moves to its left end and is located on one side of the reset inclined groove (112). S3. Push the welding torch (2) forward to move the limiting rod (401) to the bottom of the reset groove (112); S4. When the water-stop pipe (3) drives the limiting cylinder (11) to rotate counterclockwise, the limiting top rod (401) can move along the reset inclined groove (112) towards the reset groove (111); S5. After the limiting rod (401) moves along the reset groove (111), the limiting rod (401) finally enters the transposition straight groove (114). When the limiting shaft (10) drives the limiting cylinder (11) to move axially, the position adjustment between the welding gun (1) and the base material is realized. S6. After the position adjustment is completed, the limiting rod (401) enters the limiting groove (110) along the locking groove (113) to lock the distance between the welding gun (1) and the base material.

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