A welding device

Abstract

The invention relates to a welding device, which is used for welding the annular seams of the inner wall of a stainless steel vertical tank with a large thickness. The device comprises a bearing platform, a plurality of welding guns, a plurality of first fixing components, a lifting mechanism and a main control console. The bearing platform is arranged in the stainless steel vertical tank, the plurality of welding guns are arranged on the bearing platform and are arranged at intervals along the circumference of the bearing platform, the plurality of first fixing components are connected to the bearing platform to fix the bearing platform in the horizontal direction, the lifting mechanism is drivingly connected to the bearing platform to drive the bearing platform to move relative to the stainless steel vertical tank in the up and down directions, and the main control console is electrically connected to the plurality of first fixing components and the lifting mechanism respectively; a worker welds the annular seams of the stainless steel vertical tank by operating a plurality of welding guns on the bearing platform, and controls the lifting mechanism to adjust the position of the bearing platform through the main control console, thereby solving the problems of complex scaffolding with multiple annular seams and many safety hazards in narrow working surface interlacing operations, simplifying the welding process, improving working conditions and improving welding efficiency.

Description

Technical Field

[0001] The invention relates to the field of welding equipment, and in particular to a welding device. Background Art

[0002] At the construction site of large-scale stainless steel vertical tank projects, there are often a large number of large-thickness inner wall multi-ring bevel multi-layer multi-pass welds that are manually gouged and welded. Since the construction site is installed and welded upwards one ring seam at a time, it is necessary to build a complex scaffolding springboard for each belt. The welders move back and forth on the temporary springboard work surface to weld, which poses a huge safety hazard and will also lead to many welding defects, unsightly appearance, and a high rework rate. At the same time, the difficulty of reworking thick stainless steel plates also brings many cumbersome processes to the subsequent work, and the overall work efficiency cannot be improved. Summary of the invention

[0003] In order to solve the defects of the prior art, the purpose of the present invention is to provide a welding device for welding the annular seam of the thick inner wall of a stainless steel vertical tank.

[0004] In order to achieve the above purpose, a technical solution adopted by the present invention is:

[0005] A welding device for welding the thick inner wall annular seam of a stainless steel vertical tank, comprising:

[0006] The load-bearing platform is located inside the stainless steel vertical tank;

[0007] A plurality of welding guns are arranged on the bearing platform and spaced apart along the circumference of the bearing platform, and are used for welding the thick inner wall annular seam of the stainless steel vertical tank;

[0008] A plurality of first fixing components are arranged at intervals along the circumference of the stainless steel tank on the inner wall of the stainless steel tank and connected to the bearing platform to fix the bearing platform in the horizontal direction;

[0009] A lifting mechanism is disposed in the stainless steel tank and is drivingly connected to the carrying platform to drive the carrying platform to move relative to the stainless steel tank in an up-and-down direction; and

[0010] A main control console, electrically connected to the plurality of first fixing components and the lifting mechanism respectively;

[0011] Among them, the horizontal direction is perpendicular to the up and down direction.

[0012] Optionally, the lifting mechanism includes multiple lifting components, which are arranged at intervals along the circumference of the stainless steel tank, and each lifting component includes a first positioning fixture, a hoist and two connecting parts. The first positioning fixture is arranged on the inner wall of the stainless steel tank and is arranged close to the upper port of the stainless steel tank, and is connected to one end of the hoist through one of the two connecting parts, and the other end of the hoist is connected to the supporting platform through the other of the two connecting parts.

[0013] Optionally, each first fixing assembly includes:

[0014] A second positioning fixture, part of the upper end surface of which is concave downward to form a positioning groove, the upper end surface of the positioning groove is arranged in a cross shape, and the positioning groove is arranged to penetrate the two side walls in the radial direction of the stainless steel vertical tank; and

[0015] The retractable connecting rod can be retracted along the radial direction of the stainless steel tank and connected to the bearing platform. The end away from the bearing platform is provided with elastic steel balls on both sides of the circumference of the stainless steel tank to match the positioning groove.

[0016] Optionally, each first fixing assembly further comprises a retractable oblique support rod, which is disposed on the lower side of the retractable connecting rod and has one end connected to the retractable connecting rod and the other end abutting against the inner wall of the stainless steel tank; and / or,

[0017] Each first fixing assembly further includes a level adjuster, which is inserted into the lower side of the end of the telescopic connecting rod away from the bearing platform along the up-down direction and can move relative to the telescopic connecting rod along the up-down direction.

[0018] Optionally, the carrying platform includes:

[0019] An upper platform, on whose upper side a plurality of welding guns are mounted, and whose lower side is provided with a movable groove, on whose side wall a tooth portion is provided, and which extends along the circumference of the movable groove; and,

[0020] The lower platform is arranged on the telescopic connecting rod, and a plurality of gears are arranged on the upper side thereof. The plurality of gears are arranged at intervals along the circumference of the lower platform and are respectively meshed with the teeth of the movable grooves. A plurality of gear motors are arranged on the lower platform, and each gear motor is electrically connected to the main control console and is drivingly connected to its corresponding gear to drive the gear to rotate, so that the upper platform can rotate relative to the lower platform;

[0021] Among them, hollow rotating bearings are inserted in the middle of the upper platform, the middle of the lower platform and the telescopic connecting rod in the up and down directions respectively, and the hollow rotating bearing includes an inner ring bearing and an outer ring bearing sleeved outside the inner ring bearing.

[0022] Optionally, one of the lower side of the upper platform and the upper side of the lower platform is provided with a pulley, and the other is provided with a slide rail, the slide rail is extended along the circumference of the load-bearing platform, and the pulley and the slide rail are adapted; and / or,

[0023] A rotatable power line connector and a rotatable air pipe connector are arranged on the inner side wall of the inner ring bearing. The rotatable power line connector and the rotatable air pipe connector are arranged opposite to each other along the radial direction of the inner ring bearing.

[0024] Optionally, a laser locator is provided at the upper end of the hollow rotating bearing, and the laser locator is electrically connected to the main control console to detect the positioning data of the bearing platform in the horizontal direction and transmit the positioning data to the main control console.

[0025] Optionally, a plurality of adjustment brackets are provided on the carrying platform, and the plurality of adjustment brackets are arranged corresponding to the plurality of welding guns one by one, and each adjustment bracket can rotate relative to the carrying platform to adjust the angle between the welding gun and the inner wall of the stainless steel tank.

[0026] Optionally, a plurality of welding carriages are provided on the bearing platform, each welding carriage is provided with an adjustment bracket, and each welding carriage can move along the radial direction of the bearing platform.

[0027] Optionally, an air gouging gun is provided on the carrying platform, the air gouging gun is provided between any two adjacent welding guns among the multiple welding guns, and the air gouging gun can move relative to the carrying platform.

[0028] The welding device provided by the present invention has the following beneficial effects:

[0029] The welding device includes a carrying platform, multiple welding guns, multiple first fixed components, a lifting mechanism and a main control console. The carrying platform is carried and fixed by the first fixed component. The staff operates multiple welding guns on the carrying platform to weld the annular seams of the stainless steel vertical tank. The lifting mechanism is controlled by the main control console to enable the carrying platform to move in the up and down directions, thereby adjusting the position of the carrying platform and welding the corresponding layers of annular seams on the inner wall of the stainless steel vertical tank. This solves many problems such as the complex scaffolding with multiple annular seams and the many safety hazards of interlaced operations on narrow working surfaces, simplifies the welding process, improves working conditions, and greatly improves welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1A schematic structural diagram of an embodiment of a welding device provided by the present invention;

[0032] Figure 2 for Figure 1 A schematic diagram of the assembly of the second positioning fixture and the telescopic connecting rod;

[0033] Figure 3 for Figure 1 A schematic diagram of the structure of the upper platform from a one-way perspective;

[0034] Figure 4 for Figure 1 A schematic diagram of the structure of the first fixed component of the lower platform;

[0035] Figure 5 for Figure 1 Schematic diagram of the partial structure of the welding device. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] At the construction site of large-scale stainless steel vertical tank projects, there are often a large number of large-thickness inner wall multi-ring bevel multi-layer multi-pass welds that are manually gouged and welded. Since the construction site is installed and welded upwards one ring seam at a time, it is necessary to build a complex scaffolding springboard for each belt. The welders move back and forth on the temporary springboard work surface to weld, which poses a huge safety hazard and will also lead to many welding defects, unsightly appearance, and a high rework rate. At the same time, the difficulty of reworking thick stainless steel plates also brings many cumbersome processes to the subsequent work, and the overall work efficiency cannot be improved.

[0038] See also Figures 1 to 5 The welding device 100 is used for welding the thick inner wall annular seam of a stainless steel vertical tank 200, and includes a bearing platform 1, a plurality of welding guns 2, a plurality of first fixing components 3, a lifting mechanism 4 and a main control console 5. The bearing platform 1 is arranged in the stainless steel vertical tank 200; a plurality of welding guns 2 are arranged on the bearing platform 1 and are arranged at intervals along the circumference of the bearing platform 1, and are used for welding the thick inner wall annular seam of the stainless steel vertical tank 200; a plurality of first fixing components 3 are used to be arranged at intervals along the circumference of the stainless steel vertical tank 200 on the inner wall of the stainless steel vertical tank 200, and are connected to the bearing platform 1 to fix the bearing platform 1 in the horizontal direction; the lifting mechanism 4 is arranged in the stainless steel vertical tank 200, and is drivingly connected to the bearing platform 1, so as to drive the bearing platform 1 to move relative to the stainless steel vertical tank 200 in the up and down directions; the main control console 5 is electrically connected to the plurality of first fixing components 3 and the lifting mechanism 4 respectively; wherein, the horizontal direction is perpendicular to the up and down direction.

[0039] The technical solution provided by the present invention provides a welding device 100 for welding the thick inner wall annular seam of a stainless steel vertical tank 200. The welding device 100 includes a carrying platform 1, a plurality of welding guns 2, a plurality of first fixing components 3 and a lifting mechanism 4. The carrying platform 1 is carried and fixed by the first fixing component 3. The staff operates the plurality of welding guns 2 on the carrying platform 1 to weld the annular seam of the stainless steel vertical tank 200. The lifting mechanism 4 is controlled by the main control console 5 to enable the carrying platform 1 to move in the up and down directions, thereby adjusting the position of the carrying platform 1 and welding the annular seams of each layer of the inner wall of the stainless steel vertical tank 200. This solves many problems such as the complex scaffolding with multiple annular seams and the many safety hazards of interlaced operations on narrow working surfaces, simplifies the welding process, improves working conditions, and greatly improves welding efficiency.

[0040] It should be noted that, in the present invention, the shape of the supporting platform 1 is not limited, and can be rectangular, polygonal, etc. Specifically, in one embodiment of the present invention, the supporting platform 1 is circular, adapted to the stainless steel vertical tank 200, and can be provided with the largest area to accommodate a larger number of other equipment, which is convenient for the staff and improves the welding efficiency.

[0041] It should also be noted that, in the present invention, the type of welding gun 2 is not limited. Specifically, in one embodiment of the present invention, the welding gun 2 is a gas shielded welding, and the visibility of the arc and the molten pool of the gas shielded welding is good. The welding parameters can be adjusted according to the molten pool during the welding process. The arc is compressed by the shielding gas flow, the heat is concentrated, the welding speed is fast, the molten pool is small, the heat-affected zone is narrow, and the weldment is less deformed after welding; the welding process is easy to operate, there is no slag or very little slag, and basically no slag cleaning is required after welding. Of course, in the present invention, the number of welding guns 2 is not limited. Specifically, in one embodiment of the present invention, three welding guns 2 are provided.

[0042] It should also be noted that, in the present invention, the number of the first fixing components 3 is not limited. Figure 1 and Figure 4 In one embodiment of the present invention, four first fixing components 3 are provided, and the four first fixing components 3 are evenly spaced along the circumference of the carrying platform 1, so that the carrying platform 1 is subjected to uniform force.

[0043] For further information, see Figure 1The lifting mechanism 4 includes a plurality of lifting components 41, which are arranged at intervals along the circumference of the stainless steel tank 200, and each lifting component 41 includes a first positioning fixture 411, a hoist 412 and two connecting members 413. The first positioning fixture 411 is arranged on the inner wall of the stainless steel tank 200, and is arranged close to the upper port of the stainless steel tank 200, and is connected to one end of the hoist 412 through one of the two connecting members 413, and the other end of the hoist 412 is connected to the bearing platform 1 through the other of the two connecting members 413, so that the bearing platform 1 can move in the up and down directions, and the movement distance can be accurately controlled by the setting of the hoist 412, so that the bearing platform 1 can move to the corresponding position. After the bearing platform 1 is positioned and fixed by the first fixing component 3, the connecting member 413 for connecting the bearing platform 1 and the hoist 412 can be removed from the bearing platform 1 for standby use, and can be installed and used when another layer of annular seam needs to be welded, which is simple and convenient to operate.

[0044] It should be noted that, in the present invention, the number of lifting components 41 is not limited. Specifically, in one embodiment of the present invention, please refer to Figure 1 There are four lifting assemblies 41, and the four lifting assemblies 41 are evenly spaced along the circumference of the carrying platform 1, so that the carrying platform 1 is subjected to uniform force.

[0045] It should also be noted that, in the present invention, the form of the connecting member 413 is not limited. For details, please refer to Figure 1 In one embodiment of the present invention, the connecting member 413 is a lifting ear, which is convenient for installation and disassembly and improves work efficiency.

[0046] For details, please refer to Figure 1 and Figure 2 Each first fixing assembly 3 includes a second positioning fixture 31 and a retractable connecting rod 32. Part of the upper end surface of the second positioning fixture 31 is recessed downward to form a positioning groove 311. The upper end surface of the positioning groove 311 is cross-shaped, and the positioning groove 311 is penetrated on both side walls of the stainless steel tank 200 in the radial direction; the retractable connecting rod 32 can be retracted along the radial direction of the stainless steel tank 200, connected to the carrying platform 1, and its end away from the carrying platform 1 is provided with elastic springs on both sides of the circumference of the stainless steel tank 200. The steel ball 33 is used to adapt to the positioning groove 311, so as to realize the clamping connection between the second positioning fixture 31 and the retractable connection, and then realize the positioning of the supporting platform 1. At the same time, the setting of the elastic steel ball 33 greatly facilitates the installation and disassembly of the retractable connecting rod 32 and the second positioning fixture 31, and greatly facilitates the operation of the staff; in addition, the retractable connecting rod 32 is retractable, ensuring that the retractable connecting rod 32 can be clamped into the positioning groove 311, which is suitable for supporting platforms 1 and stainless steel vertical tanks 200 of different sizes, thereby improving practicality.

[0047] Furthermore, each first fixing assembly 3 also includes a retractable oblique support rod 34, which is arranged on the lower side of the retractable connecting rod 32, and one end of which is connected to the retractable connecting rod 32, and the other end is in contact with the inner wall of the stainless steel tank 200; through the retractability of the retractable oblique support rod 34, the retractable oblique support rod 34 can be tightly fitted with the inner wall of the stainless steel tank 200, thereby enhancing the lifting force and stability of the retractable connecting rod 32, thereby further fixing the load-bearing platform 1 and improving stability, while also preventing the load-bearing platform 1 from detaching from the second positioning fixture 31 and falling, thereby improving the safety of the staff.

[0048] Specifically, each first fixed component 3 also includes a horizontal adjuster 35, which is inserted into the lower side of the end of the telescopic connecting rod 32 away from the supporting platform 1 along the up and down direction, and can move relative to the telescopic connecting rod 32 along the up and down direction. The horizontal degree of the supporting platform 1 can be adjusted by adjusting the extension length of the horizontal adjuster 35.

[0049] It should be noted that the above two technical features can be set either one or both. For details, please refer to Figure 4 and Figure 5 In one embodiment of the present invention, the above two technical features are provided at the same time, that is, each first fixing assembly 3 also includes a retractable oblique support rod 34 and a horizontal adjuster 35, the retractable oblique support rod 34 is provided at the lower side of the retractable connecting rod 32, and one end thereof is connected to the retractable connecting rod 32, and the other end is in contact with the inner wall of the stainless steel vertical tank 200; the horizontal adjuster 35 is inserted in the lower side of the end of the retractable connecting rod 32 away from the bearing platform 1 along the up and down direction, and can move relative to the retractable connecting rod 32 along the up and down direction; in this way, the lifting force and stability of the retractable connecting rod 32 are strengthened by providing the retractable oblique support rod 34, thereby further fixing the bearing platform 1 and improving the stability and safety, and the horizontality of the bearing platform 1 is adjusted by providing the horizontal adjuster 35.

[0050] Specifically, the carrying platform 1 includes an upper platform 11 and a lower platform 12. A plurality of welding guns 2 are installed on the upper side of the upper platform 11. A movable groove 111 is opened on the lower side of the upper platform 11. A tooth portion 1111 is provided on the side wall of the movable groove 111. The tooth portion 1111 is extended along the circumference of the movable groove 111. The lower platform 12 is arranged on a telescopic connecting rod 32. A plurality of gears 13 are provided on the upper side thereof. The plurality of gears 13 are arranged at intervals along the circumference of the lower platform 12 and are respectively meshed with the tooth portions 1111 of the movable groove 111. A plurality of gear motors 14 are provided on the lower platform 12. Each gear motor 14 is electrically connected to the main control console 5 and is drivingly connected to the corresponding gear 13 to drive the gear 13 to rotate so that the upper platform 12 The upper platform 11 can rotate relative to the lower platform 12; wherein, the middle part of the upper platform 11, the middle part of the lower platform 12 and the telescopic connecting rod 32 are successively inserted with hollow rotating bearings 15 in the up and down directions, and the hollow rotating bearing 15 includes an inner ring bearing and an outer ring bearing sleeved outside the inner ring bearing; thus, the upper platform 11 is rotated by setting the gear portion 1111, the gear 13 and the gear motor 14, and the welding of each position of the annular seam is completed, so that the staff can avoid moving the welding gun 2 back and forth for welding, which greatly facilitates the work of the staff and improves the work efficiency. The output power of the gear motor 14 is controlled by the main control console 5 to realize the uniform or variable speed stable rotation of the upper platform 11, improve the practicality, thereby further improving the work efficiency.

[0051] Furthermore, one of the lower side surface of the upper platform 11 and the upper side surface of the lower platform 12 is provided with a pulley 16, and the other is provided with a slide rail 17. The slide rail 17 is extended along the circumference of the supporting platform 1, and the pulley 16 and the slide rail 17 are adapted to each other. By providing the pulley 16 and the slide rail 17, the rotation of the upper platform 11 is more stable.

[0052] Specifically, a rotatable power cord connector and a rotatable air pipe connector are provided on the inner wall of the inner ring bearing, and the rotatable power cord connector and the rotatable air pipe connector are arranged opposite to each other along the radial direction of the inner ring bearing, so as to prevent the cable and the air belt from being entangled or even damaged when the upper platform 11 rotates, thereby avoiding affecting the service life.

[0053] It should be noted that the above two technical features can be set either one or both. For details, please refer to Figure 3 and Figure 4 In one embodiment of the present invention, the above two technical features are provided simultaneously, that is, one of the lower side surface of the upper platform 11 and the upper side surface of the lower platform 12 is provided with a pulley 16, and the other is provided with a slide rail 17, the slide rail 17 is extended along the circumference of the bearing platform 1, and the pulley 16 and the slide rail 17 are adapted; and a rotatable power cord connector and a rotatable air pipe connector are provided on the inner side wall of the inner ring bearing, and the rotatable power cord connector and the rotatable air pipe connector are arranged opposite to each other along the radial direction of the inner ring bearing.

[0054] Specifically, a safety guardrail is provided around the periphery of the upper platform 11 to prevent people or objects from falling.

[0055] For details, please refer to Figure 1 and Figure 5 A laser locator 6 is provided at the upper end of the hollow rotating bearing 15. The laser locator 6 is electrically connected to the main control console 5 to detect the positioning data of the carrying platform 1 in the horizontal direction and transmit the positioning data to the main control console 5. The main control console 5 adjusts and controls the center and horizontal position of the carrying platform 1 according to the horizontal center positioning data fed back by the laser locator 6.

[0056] For details, please refer to Figure 5 A plurality of adjustment brackets 7 are provided on the carrying platform 1, and the plurality of adjustment brackets 7 are arranged one by one corresponding to the plurality of welding guns 2. Each adjustment bracket 7 can rotate relative to the carrying platform 1 to adjust the angle between the welding gun 2 and the inner wall of the stainless steel tank 200, so as to facilitate welding for the staff and improve the welding quality.

[0057] For further information, see Figure 5 , a plurality of welding carriages 8 are arranged on the carrying platform 1, each welding carriage 8 is provided with an adjustment bracket 7, and each welding carriage 8 can move along the radial direction of the carrying platform 1, so as to adjust the relative position of the welding gun 2 and the inner wall of the stainless steel tank 200, which is convenient for the staff to weld and improve the welding quality. After the welding is completed, the welding gun 2 can be kept away from the inner wall of the stainless steel tank 200 to prevent the welding gun 2 from colliding with the inner wall of the stainless steel tank 200 when the carrying platform 1 is lifted upward. More specifically, a track is arranged between the carrying platform 1 and the welding carriage 8 to facilitate the movement of the welding carriage 8.

[0058] Specifically, seats are provided next to the track to provide convenience for the staff to operate while sitting.

[0059] For details, please refer to Figure 1 and Figure 5 An air gouging gun 9 is provided on the carrying platform 1. The air gouging gun 9 is provided between any two adjacent welding guns 2 among the multiple welding guns 2, and the air gouging gun 9 can move relative to the carrying platform 1. By providing the air gouging gun 9, the root of the annular seam groove on the inner wall of the stainless steel vertical tank 200 is continuously and stably gouged and cleaned; more specifically, the air gouging gun 9 is a plasma air gouging gun 9.

[0060] Furthermore, an adjustable clamp is provided on the gouging gun 9 to adjust the position of the gouging gun 9 in the up-down direction and the angle between the gouging gun 9 and the inner wall of the stainless steel tank 200 .

[0061] Furthermore, a movable trolley is provided on the carrying platform 1, and an adjustable clamp is provided on the movable trolley to enable the gouging gun 9 to approach or move away from the inner wall of the stainless steel tank 200, further adjust the position of the gouging gun 9, and improve the gouging cleaning effect.

[0062] Specifically, a material transport hole is opened on the carrying platform 1, and a small crane is provided. The small crane can transport welding materials and small tools through the material transport hole.

[0063] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0064] The above-described embodiments are merely illustrative of the present invention, rather than all embodiments. The present invention may also be implemented in other specific ways or other specific forms without departing from the gist or essential features of the present invention. Therefore, the described embodiments should be considered illustrative rather than restrictive in any respect. The scope of the present invention should be described by the attached claims, and any changes equivalent to the intent and scope of the claims should also be included within the scope of the present invention.

Claims

1. A welding device, characterized in that: Used for welding thick inner wall annular seams of stainless steel tanks, including: A bearing platform is arranged in the stainless steel vertical tank; A plurality of welding guns are arranged on the bearing platform and spaced apart along the circumference of the bearing platform, and are used for welding the annular seam of the thick inner wall of the stainless steel vertical tank; A plurality of first fixing components, which are arranged at intervals along the circumference of the stainless steel vertical tank on the inner wall of the stainless steel vertical tank and connected to the bearing platform to fix the bearing platform in the horizontal direction; A lifting mechanism is disposed in the stainless steel tank and is drivingly connected to the carrying platform to drive the carrying platform to move relative to the stainless steel tank in an up-and-down direction; and A main control console, electrically connected to the plurality of first fixing components and the lifting mechanism respectively; Wherein, the horizontal direction is perpendicular to the up-down direction; The lifting mechanism includes a plurality of lifting components, which are arranged at intervals along the circumference of the stainless steel tank, and each of the lifting components includes a first positioning fixture, a hoist and two connecting parts. The first positioning fixture is arranged on the inner wall of the stainless steel tank and is arranged close to the upper port of the stainless steel tank, and is connected to one end of the hoist through one of the two connecting parts, and the other end of the hoist is connected to the bearing platform through the other of the two connecting parts.

2. The welding device according to claim 1, characterized in that Each of the first fixing components comprises: A second positioning fixture, a portion of the upper end surface of which is recessed downward to form a positioning groove, the upper end surface of the positioning groove is arranged in a cross shape, and the positioning groove is arranged to penetrate the two side walls of the stainless steel vertical tank in the radial direction; and The retractable connecting rod can be retracted radially along the stainless steel tank and connected to the bearing platform, and its end away from the bearing platform is provided with elastic steel balls on both sides of the circumference of the stainless steel tank to match the positioning groove.

3. The welding device according to claim 2, characterized in that: Each of the first fixing components further includes a retractable oblique support rod, which is disposed on the lower side of the retractable connecting rod, and one end of which is connected to the retractable connecting rod, and the other end of which is in contact with the inner wall of the stainless steel tank; and / or, Each of the first fixing components further includes a level adjuster, which is inserted along the up-down direction at the lower side of the end of the telescopic connecting rod away from the carrying platform and can move relative to the telescopic connecting rod along the up-down direction.

4. The welding device according to claim 2, characterized in that: The carrying platform comprises: An upper platform, on whose upper side a plurality of welding guns are mounted, and whose lower side is provided with a movable groove, whose side wall is provided with a tooth portion, and the tooth portion is extended along the circumference of the movable groove; and The lower platform is arranged on the telescopic connecting rod, and a plurality of gears are arranged on the upper side thereof. The plurality of gears are arranged at intervals along the circumference of the lower platform and are respectively meshed with the teeth of the movable grooves. The lower platform is provided with a plurality of gear motors, and each of the gear motors is electrically connected to the main control console and is drivingly connected to the corresponding gear to drive the gear to rotate, so that the upper platform can rotate relative to the lower platform; Among them, hollow rotating bearings are inserted in the middle part of the upper platform, the middle part of the lower platform and the retractable connecting rod in sequence along the up and down directions, and the hollow rotating bearing includes an inner ring bearing and an outer ring bearing sleeved outside the inner ring bearing.

5. The welding device according to claim 4, characterized in that One of the lower side of the upper platform and the upper side of the lower platform is provided with a pulley, and the other is provided with a slide rail, the slide rail is extended along the circumference of the load-bearing platform, and the pulley and the slide rail are adapted; and / or, A rotatable power line connector and a rotatable air pipe connector are provided on the inner side wall of the inner ring bearing, and the rotatable power line connector and the rotatable air pipe connector are arranged opposite to each other along the radial direction of the inner ring bearing.

6. The welding device according to claim 4, characterized in that: A laser locator is provided at the upper end of the hollow rotary bearing. The laser locator is electrically connected to the main control console to detect the positioning data of the bearing platform in the horizontal direction and transmit the positioning data to the main control console.

7. The welding device according to claim 1, characterized in that: The bearing platform is provided with a plurality of adjustment brackets, and the plurality of adjustment brackets are arranged corresponding to the plurality of welding guns one by one. Each of the adjustment brackets can rotate relative to the bearing platform to adjust the angle between the welding gun and the inner wall of the stainless steel tank.

8. The welding device according to claim 7, characterized in that A plurality of welding carriages are arranged on the bearing platform, each of the welding carriages is provided with the adjusting bracket, and each of the welding carriages can move along the radial direction of the bearing platform.

9. The welding device according to claim 1, characterized in that: An air gouging gun is disposed on the carrying platform. The air gouging gun is disposed between any two adjacent welding guns among the plurality of welding guns, and the air gouging gun can move relative to the carrying platform.

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