A welding device for underwater steel structure maintenance

Abstract

The present invention discloses a welding device for underwater steel structure maintenance, which relates to the technical field of steel structures. The present invention includes a bottom plate, and an installation structure is fixedly connected to the upper end of the bottom plate. Buffer structures are symmetrically and fixedly connected along the center line inside the installation structure. Clamping structures are arranged on the upper and lower end faces between the two buffer structures. Positioning structures are arranged in the middle of the left and right end faces inside the installation structure. A placing structure is fixedly connected in the middle between the fixing structure and the driving structure. Lifting and adjusting structures are fixedly connected to one side close to the fixing structure at the mutually distant ends of the two placing structures. A magnetic attraction structure is fixedly connected between the two fixing structures and the ends of the driving structure far away from the installation structure. By means of a threaded sleeve, a limit telescopic rod, and a positioning clamping plate, the welding plate is accurately placed in a suitable position and mutually attached to the steel structure main body, further ensuring the welding precision, making the welding joint quality higher, and reducing welding defects.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structures, and particularly to a welding device for underwater steel structure maintenance. Background Art

[0002] In the construction of water conservancy projects, it is sometimes necessary to install steel structures underwater. A steel structure is a structure composed of steel materials and is one of the main types of building structures. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of sections and steel plates, and rust removal and anti-rust processes such as silanization, pure manganese phosphating, water washing and drying, and galvanizing are adopted. Welding is usually used to connect each component or part, and a reinforcing welding plate is required during welding.

[0003] Due to the complex underwater environment, factors such as water flow may cause the plates to shake or be difficult to position at a suitable location for welding. At the same time, due to the special underwater environment, it is difficult to ensure that the equipment fits tightly with the steel structure and is fixed reliably. Moreover, during underwater welding, personnel are easily affected by buoyancy, water flow and undercurrents, causing personnel to shake, which affects the welding efficiency. Undercurrents may also pose a threat to personnel, and there is a risk of electric leakage during welding, and the electric leakage is not easily detected in time, which poses a threat to personnel safety and the smooth progress of welding work.

[0004] Therefore, an existing welding device for underwater steel structure maintenance cannot meet the requirements in actual use, so there is an urgent need for improved technology in the market to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding device for underwater steel structure maintenance, which solves the problems raised in the above background art through the following settings.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0007] The present invention is a welding device for underwater steel structure maintenance, including a bottom plate. A mounting structure is fixedly connected to the upper end of the bottom plate. Buffer structures are symmetrically and fixedly connected along the center line inside the mounting structure. Clamping structures are arranged on the upper and lower end faces between the two buffer structures. Positioning structures are arranged in the middle of the left and right end faces inside the mounting structure. Fixing structures are fixedly connected to the middle of the upper and lower end faces of the bottom plate and the mounting structure. Driving structures are arranged in the middle of the left and right end faces of the mounting structure. A placing structure is fixedly connected in the middle between the fixing structure and the driving structure. Lifting and adjusting structures are fixedly connected to one side close to the fixing structure at one end of the two placing structures away from each other. A magnetic attraction structure is fixedly connected between one end of the two fixing structures and the driving structure away from the mounting structure.

[0008] Preferably, the installation structure includes a mounting frame fixedly connected to the upper end face of the bottom plate. The upper end face of the mounting frame is fixedly connected with a top plate. The middle part of the front end face of the mounting frame is fixedly connected with a mounting handle. The upper part of the left end face of the top plate is fixedly connected with a current detection and alarm module, and the current detection and alarm module includes an audible and visual alarm and an underwater leakage detector.

[0009] Preferably, the buffer structure includes sliding rods symmetrically and fixedly connected to the upper and lower sides inside the mounting frame. The outer surface of the sliding rods is symmetrically slidably connected with sliders. The middle part of the outer surface of the sliding rods is movably sleeved with springs, and the springs are drivingly connected between the two sliders. Clamping structures are respectively fixedly connected to the upper and lower sides between the two opposite sliders.

[0010] Preferably, the clamping structure includes rotating frames respectively fixedly connected to the upper and lower sides between the two opposite sliders. A transmission rod is rotatably connected inside the rotating frame. One end of the transmission rod away from the rotating frame is rotatably connected with a pressing plate through another rotating frame.

[0011] Preferably, the positioning structure includes threaded rods respectively fixedly connected to the middle parts of the left and right sides inside the mounting frame. The outer surface of the threaded rods is threadedly connected with threaded sleeves. Limiting telescopic rods are fixedly connected to the upper and lower sides of the threaded rods at the left and right ends inside the mounting frame. One end of the limiting telescopic rod away from the mounting frame is fixedly connected with a positioning clamping plate, and one end of the threaded sleeve away from the threaded rod is rotatably connected with the positioning clamping plate.

[0012] Preferably, the fixing structure includes connecting shafts respectively fixedly connected to the middle parts of the upper and lower end faces of the bottom plate and the top plate. The outer surface of the connecting shafts is symmetrically hinged with fixing claws. An inflatable airbag is fixedly connected to the outer surface of the fixing claws through a bracket.

[0013] Preferably, the driving structure includes driving rotating shafts fixedly connected to the middle parts of the left and right side faces of the mounting frame. The outer surface of the driving rotating shafts is hinged with push rods. One end of the push rod away from the driving rotating shaft is hinged with another driving rotating shaft. One end of the other driving rotating shaft away from the push rod is hinged with a driving claw. A placing structure is fixedly connected to the middle between the fixing claw and the driving claw.

[0014] Preferably, the placing structure includes a placing plate fixedly connected to the middle between the fixing claw and the driving claw. A placing groove is formed in the middle of the outer surface of the placing plate. Adjusting rollers are symmetrically rotatably connected inside the placing groove. A lifting and adjusting structure is fixedly connected to one end of the outer surface of the placing groove away from the driving claw.

[0015] Preferably, the lifting and adjusting structure includes an adjusting structure fixedly connected to the outer surface of the placing plate away from one end of the driving jaw. Symmetrically and fixedly connected to the upper and lower end faces between adjacent two adjusting structures are transmission pipes. The adjusting structure includes an adjusting frame fixedly connected to the outer surface of the placing plate near the fixed jaw. An installation groove is formed at one end of the adjusting frame away from the placing plate. A micro air pump is threadedly connected to the inner cavity of the installation groove. The output end of the micro air pump is interconnected with the inflatable airbag through the transmission pipe.

[0016] Preferably, the magnetic attraction structure includes a connecting plate fixedly connected to one side of the fixed jaw away from the connecting shaft. One end of the driving jaw away from the mounting frame is fixedly connected to the connecting plate. Magnetically attracting blocks are evenly and fixedly connected to the left and right sides between the two connecting plates. The magnetic poles of the opposite two magnetically attracting blocks are opposite to each other.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention conveniently clamps and fixes the welding plates through the pressing plate, transmission rod, slider, sliding rod and the spring on its outer surface, ensuring the stable position of the plates during the welding process, providing a stable foundation for subsequent welding operations, avoiding the influence of plate shaking on the welding quality. Through the push rod, driving jaw, driving rotating shaft, fixed jaw and placing structure, the welding equipment can be stably installed on the steel structure column, providing a stable support point for welding operations in complex underwater environments, ensuring that the welding work can be accurately carried out on the surface of the steel structure, improving the accuracy and efficiency of welding. Through the threaded sleeve, limit telescopic rod and positioning clamping plate, the welding plates are accurately placed in the appropriate position and mutually attached to the steel structure main body, further ensuring the welding accuracy, making the welding joint quality higher and reducing welding defects.

[0019] 2. The present invention, through the installation of the handle and safety hook, avoids the influence of personnel shaking caused by underwater buoyancy and water flow on the welding efficiency, and at the same time resists the threat of underwater undercurrents to personnel, ensuring the safety of personnel during underwater welding, reducing welding mistakes caused by external interference. Through the underwater leakage detector and the audible and visual alarm in the current detection and alarm module on the mounting frame, it can timely remind personnel to pause work and check the working equipment, prevent the risk of electric shock to personnel, and improve the safety of underwater welding work. Through including the push rod, magnetically attracting blocks, fixed jaw, driving jaw and lifting and adjusting structure (including micro air pump, transmission pipe, inflatable airbag), it is convenient for personnel to return to the water surface from underwater after welding is completed, without additional floating assistance equipment, improving the convenience and efficiency of the entire underwater welding work.

[0020] Certainly, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the front view three-dimensional structure of the present invention;

[0023] Figure 2 Schematic diagram of the rear view three-dimensional structure of the present invention;

[0024] Figure 3 Schematic diagram of the left side view three-dimensional structure of the present invention;

[0025] Figure 4 Schematic diagram of the horizontal half-section three-dimensional structure of the present invention;

[0026] Figure 5 Schematic diagram of the installation structure of the positioning structure of the present invention;

[0027] Figure 6 For the present invention Figure 3 Enlarged structure diagram of area A in the present invention.

[0028] In the drawings, the list of components represented by each reference numeral is as follows:

[0029] 1. Bottom plate; 2. Installation structure; 21. Installation frame; 22. Top plate; 23. Installation handle; 3. Buffer structure; 31. Sliding rod; 32. Slide block; 4. Clamping structure; 41. Rotating frame; 42. Transmission rod; 43. Extrusion plate; 5. Positioning structure; 51. Threaded rod; 52. Threaded sleeve; 53. Limit telescopic rod; 54. Positioning clamping plate; 6. Fixing structure; 61. Connecting shaft; 62. Fixed clamping jaw; 63. Inflatable airbag; 7. Driving structure; 71. Driving rotating shaft; 72. Push rod; 73. Driving clamping jaw; 8. Placing structure; 81. Placing plate; 82. Placing groove; 83. Adjusting roller; 9. Lifting and adjusting structure; 91. Adjusting structure; 911. Adjusting frame; 912. Installation groove; 913. Micro air pump; 92. Transmission pipe; 10. Magnetic attraction structure; 101. Connecting plate; 102. Magnetic attraction block. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention.

[0031] Please refer to Figures 1-6As shown in the figure, this embodiment is a welding device for underwater steel structure maintenance, including a bottom plate 1. A mounting structure 2 is fixedly connected to the upper end of the bottom plate 1. Buffer structures 3 are symmetrically and fixedly connected to the inner cavity of the mounting structure 2 along the center line. Clamping structures 4 are arranged on the upper and lower end faces between the two buffer structures 3. Positioning structures 5 are arranged in the middle of the left and right end faces of the inner cavity of the mounting structure 2. Fixed structures 6 are fixedly connected to the middle of the upper and lower end faces of the bottom plate 1 and the mounting structure 2. Driving structures 7 are arranged in the middle of the left and right end faces of the mounting structure 2. A placing structure 8 is fixedly connected in the middle between the fixed structure 6 and the driving structure 7. Lifting and adjusting structures 9 are fixedly connected to one side close to the fixed structure 6 at the mutually remote ends of the two placing structures 8. A magnetic attraction structure 10 is fixedly connected between the two fixed structures 6 and the ends of the driving structure 7 away from the mounting structure 2.

[0032] Furthermore, the mounting structure 2 includes a mounting frame 21 fixedly connected to the upper end face of the bottom plate 1. A top plate 22 is fixedly connected to the upper end face of the mounting frame 21. A mounting handle 23 is fixedly connected to the middle of the front end face of the mounting frame 21. An electric current detection and alarm module is fixedly connected to the upper part of the left end face of the top plate 22. The electric current detection and alarm module includes an audible and visual alarm and an underwater leakage detector. By means of the mounting handle 23 and a safety hook, it is possible to avoid the influence of personnel shaking caused by underwater buoyancy and water flow on the welding efficiency, and at the same time resist the threat of underwater undercurrents to personnel, ensure the safety of personnel during underwater welding, and reduce welding mistakes caused by external interference. Through the underwater leakage detector and the audible and visual alarm in the electric current detection and alarm module on the mounting frame 21, it is possible to timely remind personnel to suspend work and check the working equipment, prevent the danger of electric shock to personnel, and improve the safety of underwater welding work.

[0033] Furthermore, the buffer structure 3 includes sliding rods 31 symmetrically and fixedly connected to the upper and lower sides of the inner cavity of the mounting frame 21. Sliders 32 are symmetrically slidably connected to the outer surface of the sliding rods 31. A spring is movably sleeved on the middle of the outer surface of the sliding rods 31. The spring is connected between the two sliders 32 in a transmission manner. Clamping structures 4 are fixedly connected to the upper and lower sides between the two opposite sliders 32. By means of the sliders 32, the sliding rods 31 and the spring on their outer surfaces, the clamping structures 4 are placed during use, and then the distance between the pressing plates 43 is adjusted through the expansion and contraction of the spring and the mutual movement of the sliders 32.

[0034] Furthermore, the clamping structure 4 includes rotating frames 41 respectively fixedly connected to the upper and lower sides between the two opposite sliders 32. A transmission rod 42 is rotatably connected to the inner cavity of the rotating frame 41. One end of the transmission rod 42 away from the rotating frame 41 is rotatably connected to a pressing plate 43 through another rotating frame 41. By means of the pressing plate 43, the transmission rod 42, the sliders 32, the sliding rods 31 and the spring on their outer surfaces, the welding plates can be conveniently clamped and fixed, ensuring the stable position of the plates during the welding process, providing a stable basis for subsequent welding operations, and avoiding the influence of plate shaking on the welding quality.

[0035] Further, the positioning structure 5 includes threaded rods 51 respectively and fixedly connected to the middle parts of the left and right sides inside the inner cavity of the mounting frame 21. A threaded sleeve 52 is threadedly connected to the outer surface of the threaded rod 51. Limit telescopic rods 53 are fixedly connected to the upper and lower sides of the threaded rods 51 at the left and right ends inside the inner cavity of the mounting frame 21. One end of the limit telescopic rod 53 away from the mounting frame 21 is fixedly connected to a positioning clamping plate 54. One end of the threaded sleeve 52 away from the threaded rod 51 is rotatably connected to the positioning clamping plate 54. Through the threaded sleeve 52, the limit telescopic rod 53, and the positioning clamping plate 54, the welding plate is accurately placed in the appropriate position and mutually attached to the steel structure main body, further ensuring the welding precision, making the welding joint quality higher, and reducing welding defects.

[0036] Further, the fixing structure 6 includes connecting shafts 61 respectively and fixedly connected to the middle parts of the upper and lower end faces of the bottom plate 1 and the top plate 22. Fixed clamping claws 62 are symmetrically hinged to the outer surface of the connecting shaft 61. An inflatable airbag 63 is fixedly connected to the outer surface of the fixed clamping claw 62 through a bracket. Through the fixing structure 6 on the bottom plate 1 and the mounting structure 2, during use, through cooperation with the driving structure 7, 8 is installed and placed. Furthermore, under the action of the buoyancy of the water flow, the inflatable airbag 63 drives the personnel to float upward, facilitating the recovery of the equipment.

[0037] Further, the driving structure 7 includes driving rotating shafts 71 fixedly connected to the middle parts of the left and right side end faces of the mounting frame 21. A push rod 72 is hinged to the outer surface of the driving rotating shaft 71. One end of the push rod 72 away from the driving rotating shaft 71 is hinged to another driving rotating shaft 71. One end of the other driving rotating shaft 71 away from the push rod 72 is hinged to a driving clamping claw 73. A placing structure 8 is fixedly connected to the middle part between the fixed clamping claw 62 and the driving clamping claw 73. Through the push rod 72, the driving clamping claw 73, the driving rotating shaft 71, the fixed clamping claw 62, and the placing structure 8, the welding equipment can be stably installed on the steel structure column, providing a stable support point for the welding operation in the complex underwater environment, ensuring that the welding work can be accurately carried out on the surface of the steel structure, and improving the accuracy and efficiency of welding.

[0038] Further, the placing structure 8 includes a placing plate 81 fixedly connected to the middle part between the fixed clamping claw 62 and the driving clamping claw 73. A placing groove 82 is formed in the middle of the outer surface of the placing plate 81. Adjusting rollers 83 are symmetrically and rotatably connected to the inner cavity of the placing groove 82. A lifting and adjusting structure 9 is fixedly connected to the outer surface of the placing groove 82 away from the driving clamping claw 73. Through the placing structure 8 on the fixing structure 6 and the driving structure 7, during use, the lifting and adjusting structure 9 is installed and placed. Furthermore, through the adjusting rollers 83 in the inner cavity of the placing groove 82, the device can move up and down during use.

[0039] Furthermore, the lifting and adjusting structure 9 includes an adjusting structure 91 fixedly connected to the outer surface of the placing plate 81 at one end away from the driving jaw 73. Symmetrically fixedly connected to the upper and lower end faces between adjacent adjusting structures 91 are transfer pipes 92. The adjusting structure 91 includes an adjusting frame 911 fixedly connected to the outer surface of the placing plate 81 near the fixed jaw 62. An installation groove 912 is formed at one end of the adjusting frame 911 away from the placing plate 81. A micro air pump 913 is threadedly connected to the inner cavity of the installation groove 912. The output end of the micro air pump 913 is interconnected with the inflatable airbag 63 through the transfer pipe 92. By including the push rod 72, the magnetic attraction block 102, the fixed jaw 62, the driving jaw 73, and the lifting and adjusting structure 9 (including the micro air pump 913, the transfer pipe 92, and the inflatable airbag 63), it is convenient for personnel to return from underwater to the water surface after welding is completed, without the need for additional buoyancy assistance equipment, improving the convenience and efficiency of the entire underwater welding work.

[0040] Furthermore, the magnetic attraction structure 10 includes a connecting plate 101 fixedly connected to one side of the fixed jaw 62 away from the connecting shaft 61. One end of the driving jaw 73 away from the mounting frame 21 is fixedly connected to the connecting plate 101. Magnetically attractive blocks 102 are evenly fixedly connected to the left and right sides between the two connecting plates 101. The magnetic poles of the opposite two magnetically attractive blocks 102 are opposite. Through the magnetic attraction structure 10 on the fixing structure 6 and the driving structure 7, when the fixing structure 6 and the driving structure 7 clamp the steel column during use, the device is stably clamped, avoiding accidental collisions and causing the device to fall off. At the same time, through the installed magnetically attractive blocks 102, it enables personnel to efficiently separate the fixed jaw 62 and the driving jaw 73 after use.

[0041] Working principle: During operation, relatively push and squeeze the pressing plate 43, causing the transmission rod 42 to rotate. Therefore, the slider 32 slides relatively, further causing the spring on the outer surface of the sliding rod 31 to elongate. At this time, the operator places the welding plate between the two pressing plates 43. Then, release the pressing plate 43, causing the spring on the outer surface of the sliding rod 31 to contract. So the sliders 32 approach each other, further causing the transmission rod 42 to rotate in the reverse direction. Therefore, the two pressing plates 43 approach each other, thereby clamping and fixing the welding plate.

[0042] When in use, a person carries this device into the water. At this time, the push rod 72 is pulled relatively, so that the two driving jaws 73 move away from each other, and then the mounting bracket 21 is fitted to the steel structure column. Then, the push rod 72 is pushed in the reverse direction, so that the push rod 72 and the driving jaws 73 rotate in the reverse direction with the driving rotating shaft 71 as the center of the circle. Since the fixed jaw 62 is fixedly connected to the driving jaw 73 through the placing structure 8, the fixed jaw 62 rotates simultaneously, so that the fixing structure 6 and the driving structure 7 are sleeved on the outer surface of the steel structure. At this time, the person rotates the threaded sleeves 52 on both sides of the inner cavity of the mounting bracket 21 respectively, so that the limit telescopic rod 53 expands and contracts, and then the two positioning clamping plates 54 move towards each other, so as to place the welding plate at a proper position and fit it to the steel structure main body at the same time, thus facilitating the person to weld the plate.

[0043] When the person is welding, the safety hook is hung on the mounting handle 23, so as to prevent the person from shaking due to the underwater buoyancy and the action of the water flow, which affects the welding efficiency, and at the same time prevent the underwater undercurrent from threatening the person.

[0044] When welding and electric leakage occurs, it is detected by the underwater electric leakage detector in the current detection and alarm module on the mounting bracket 21, and then the signal is transmitted to the sound and light alarm to remind the person, so that the person pauses work and checks the working equipment.

[0045] When the welding is completed, the push rod 72 is pulled, so that the push rod 72 and the driving jaws 73 rotate in the reverse direction with the driving rotating shaft 71 as the center of the circle, so that the magnetic attraction block 102 no longer adsorbs, and then the fixed jaw 62 and the driving jaw 73 move away from each other. At this time, the lifting and adjusting structure 9 is started, so that the micro air pump 913 is turned on, and the gas is transmitted to the inflatable airbag 63 through the transmission pipe 92. At this time, since the inflatable airbag 63 is made of elastic material, the inflatable airbag 63 expands. Since the gas density in the inner cavity of the inflatable airbag 63 is less than that of water, the device drives the person to float upward under the action of the water flow buoyancy.

[0046] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0047] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A welding device for underwater steel structure maintenance, comprising a bottom plate (1), characterized in that; The upper end of the bottom plate (1) is fixedly connected to a mounting structure (2), and the inner cavity of the mounting structure (2) is symmetrically fixedly connected to a buffer structure (3) along the center line. A clamping structure (4) is provided on both upper and lower end surfaces between the two buffer structures (3). A positioning structure (5) is provided in the middle of both left and right end surfaces of the inner cavity of the mounting structure (2). A fixing structure (6) is fixedly connected to both upper and lower end surfaces of the bottom plate (1) and the mounting structure (2). A driving structure (7) is provided in the middle of both left and right end surfaces of the mounting structure (2). A placement structure (8) is fixedly connected in the middle between the fixing structure (6) and the driving structure (7). A lifting adjustment structure (9) is fixedly connected to the side of the two ends of the placement structures (8) that are away from each other and close to the fixing structure (6). A magnetic attraction structure (10) is fixedly connected between the two ends of the fixing structures (6) and the driving structure (7) that are away from the mounting structure (2). The fixing structure (6) comprises a connecting shaft (61) fixedly connected to the middle of the upper and lower end surfaces of the bottom plate (1) and the top plate (22), respectively. The outer surface of the fixing jaw (61) is symmetrically hinged with a fixing jaw (62), and the outer surface of the fixing jaw (62) is fixedly connected to an inflatable airbag (63) via a bracket. The mounting structure (2) includes a mounting frame (21) fixedly connected to the upper end surface of the base plate (1). The driving structure (7) includes a driving shaft (71) fixedly connected to the middle of the left and right end surfaces of the mounting frame (21). The outer surface of the driving shaft (71) is hinged with a push rod (72), and one end of the push rod (72) away from the driving shaft (71) is hinged with another end of the driving shaft (71). The driving shaft (71) and the other end of the driving shaft (71) away from the pushing rod (72) are hingedly connected with a driving clamp (73), and a placement structure (8) is fixedly connected in the middle between the fixed clamp (62) and the driving clamp (73). When in use, the fixed structure and the driving structure are sleeved on the outer surface of the steel structure, and the clamping structure and the buffer structure are used to clamp and fix the welding plate, place the welding plate in a suitable position, and fit it with the main body of the steel structure. When welding is completed, the inflatable airbag is inflated to generate buoyancy.

2. The underwater steel structure maintenance welding equipment according to claim 1, characterized in that: The upper end surface of the mounting frame (21) is fixedly connected to a top plate (22), the middle portion of the front end surface of the mounting frame (21) is fixedly connected to a mounting handle (23), and the upper portion of the left end surface of the top plate (22) is fixedly connected to a current detection alarm module, wherein the current detection alarm module comprises an audible and visual alarm and an underwater leakage detector.

3. The underwater steel structure maintenance welding equipment according to claim 2, characterized in that: The buffer structure (3) comprises a sliding rod (31) symmetrically fixedly connected to the upper and lower sides of the inner cavity of the mounting frame (21); a sliding block (32) is symmetrically slidably connected to the outer surface of the sliding rod (31); a spring is movably sleeved in the middle of the outer surface of the sliding rod (31); the spring is transmission-connected between the two sliding blocks (32); and a clamping structure (4) is fixedly connected to the upper and lower sides of the two sliding blocks (32).

4. The underwater steel structure maintenance welding equipment according to claim 3, characterized in that: The clamping structure (4) comprises a rotating frame (41) respectively fixedly connected to the upper and lower sides between the two opposing sliding blocks (32); a transmission rod (42) is rotatably connected to the inner cavity of the rotating frame (41); and one end of the transmission rod (42) away from the rotating frame (41) is rotatably connected to a pressing plate (43) via the other rotating frame (41).

5. The underwater steel structure maintenance welding equipment according to claim 1, characterized in that: The positioning structure (5) comprises threaded rods (51) respectively fixedly connected to the middle of the left and right sides of the inner cavity of the mounting frame (21); the outer surface of the threaded rods (51) is threadedly connected to a threaded sleeve (52); the threaded rods (51) at the left and right ends of the inner cavity of the mounting frame (21) are fixedly connected to the upper and lower sides of the limited telescopic rods (53); one end of the limited telescopic rod (53) away from the mounting frame (21) is fixedly connected to a positioning clamping plate (54); and one end of the threaded sleeve (52) away from the threaded rod (51) is rotatably connected to the positioning clamping plate (54).

6. The underwater steel structure maintenance welding equipment according to claim 2, characterized in that: The placement structure (8) comprises a placement plate (81) fixedly connected to the middle part between the fixed clamping jaw (62) and the driving clamping jaw (73); a placement groove (82) is provided in the middle part of the outer surface of the placement plate (81); an adjustment roller (83) is symmetrically rotatably connected to the inner cavity of the placement groove (82); and a lifting and lowering adjustment structure (9) is fixedly connected to one end of the outer surface of the placement groove (82) away from the driving clamping jaw (73).

7. The underwater steel structure maintenance welding equipment according to claim 1, characterized in that: The lifting and lowering adjustment structure (9) comprises an adjustment structure (91) fixedly connected to an end of the outer surface of the placement plate (81) away from the driving clamp (73), and a transmission tube (92) is symmetrically fixedly connected to the upper and lower end surfaces between two adjacent adjustment structures (91). The adjustment structure (91) comprises an adjustment frame (911) fixedly connected to the outer surface of the placement plate (81) near the fixed clamp (62), and a mounting groove (912) is formed at one end of the adjustment frame (911) away from the placement plate (81). The inner cavity of the mounting groove (912) is threadedly connected to a micro air pump (913), and the output end of the micro air pump (913) is connected to the inflatable air bag (63) through the transmission tube (92).

8. The underwater steel structure maintenance welding equipment according to claim 1, characterized in that: The magnetic attraction structure (10) comprises a connecting plate (101) fixedly connected to a side of the fixed clamping jaw (62) away from the connecting shaft (61); an end of the driving clamping jaw (73) away from the mounting frame (21) is fixedly connected to the connecting plate (101); and magnetic attraction blocks (102) are evenly fixedly connected on the left and right sides between the two connecting plates (101), and the magnetism of the two magnetic attraction blocks (102) is opposite to each other.

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