Automatic welding equipment for inner corner of LNG storage tank

Abstract

The present application relates to automatic welding technical field, especially to a kind of LNG storage tank inner angle automatic welding equipment, comprising: multiple by suitable for liquefied gas storage tank plane portion Curved portion, straight line portion, curved portion and straight line portion intersection and thin sheet composition's intersection and welding torch, the surface of multiple intersection is equipped with automatic welding equipment jointly.The present application passes through the cooperation of multiple components in overload protection module, when welding torch lifting height is lower than the height of curved portion in the process that welding torch crosses curved portion, moving plate first contacts curved portion, based on the power of welding torch displacement, so that moving plate slides on the lower surface of mounting box, driving plate is rotated, so that limiting plate moves in mounting box, so that limiting plate and connecting plate are separated, no longer limiting connecting plate, by the elastic force of damping spring, so that adjusting frame moves following the extension of damping spring, further lifting the height of welding torch, realize instant retreat and unloading.

Description

Technical Field

[0001] This invention relates to the field of automatic welding technology, and in particular to an automatic welding device for the inner corners of LNG storage tanks. Background Technology

[0002] In storage tanks for liquefied gases such as LNG, a structure consisting of primary and secondary retaining walls is widely used. The primary retaining wall of the liquefied gas storage tank includes a curved section (fold) suitable for the planar portion of the liquefied gas storage tank and a membrane plate composed of straight sections. The corner portion of the liquefied gas storage tank has a bent section, a corner plate welded together, a thin plate welded together with each other, and a corner portion with end folds connected by welded welds on the upper part of the corner plate. Here, the curved section of the membrane plate forms a first fold with a first height and a first width, a second fold with a second height and a second width that intersects with the first fold and is smaller in size than the first fold, and a grid pattern of fold intersections formed at the intersection of the first fold and the second fold.

[0003] Most existing automatic corner welding devices for LNG storage tanks use a first sensor installed on the welding point to collect information about the object being welded in front of the welding point, and a second sensor installed on the welding point to collect information about the object being welded behind the welding point. These sensors automatically detect the size of the curved section and start from other curved sections thereafter, so that welding points that cross the curved section can be aligned at the welding position, reducing welding time and maintaining uniform welding quality.

[0004] However, in the process of automatic welding of the inner corner of LNG storage tank, the above method requires that when the bracket is welding on the first straight segment of multiple straight segments at the corner of the liquefied gas storage tank, if the first sensor detects the starting point of the first curved segment of multiple curved segments, the bracket should stop moving forward, the welding operation should be stopped, and the rise distance of the first curved segment at the welding point should be greater than that of the first curved segment after the welding point. The welding point is lowered to the second straight segment among multiple straight segments, and the bracket is tilted towards the first curved section. When the second sensor detects the endpoint of the first curved section, the welding torch will start the welding operation on the second straight segment. However, when the welding torch and the contouring mechanism encounter unexpected obstacles such as membrane folds, corner plates, weld protrusions, weld beads, or installation deviations, they cannot achieve immediate retraction and unloading. This causes the bottom of the welding torch to contact the fold edge of the fold. The impact force of the welding torch head during its movement acts on the fold, which may cause the fold to be pushed out with pits, indentations, or even torn or scratched, resulting in damage to the LNG membrane and causing the storage tank to have a leakage risk.

[0005] Therefore, the present invention provides an automatic welding device for the inner corners of LNG storage tanks to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic welding device for the inner corners of LNG storage tanks.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An automatic welding device for the inner corner of an LNG storage tank includes: a retaining wall composed of multiple curved portions, straight portions, and intersections formed by the intersection of curved portions and straight portions suitable for the planar portion of the liquefied gas storage tank, as well as a welding torch, wherein the surfaces of the multiple intersections are jointly provided with the automatic welding device. The automatic welding equipment includes a drive module, an overload protection module, an adaptive module, and a cleaning module; The overload protection module includes a limit plate, a damping spring, a connecting plate, a limit spring, a drive plate, and a trigger unit; In the initial state of the overload protection module, the limiting plate and the connecting plate are attached, one end of the damping spring is attached to one side of the lower surface of the connecting plate, and the connecting plate is slidably sleeved on the surface of the damping spring. The limiting spring is fixedly connected to the limiting plate to provide support for the limiting plate, and the drive plate is attached to the bottom of one side of the limiting plate.

[0008] Preferably, the triggering unit includes a limiting box that is slidably sleeved on the limiting plate and an installation box that is parallel to and fixedly connected to the limiting box. The limiting spring is fixedly installed inside the installation box, and the limiting plate is slidably installed inside the installation box. The driving plate is rotatably connected to the inside of the installation box via a pin.

[0009] Preferably, the triggering unit further includes a movable plate rotatably connected to the drive plate via a pin and slidably connected to the lower surface of the mounting box, and a guide wheel rotatably connected to a damping spring via a pin. The bottom of the movable plate is parallel to the nozzle of the welding torch, and the guide wheel is rotatably mounted on the surface of the drive module.

[0010] Preferably, the adaptive module includes a mounting bracket, a contour wheel, a welding end, a fixing plate, and an elastic pad that are fixedly connected to the surface of the welding torch by bolts. The contour wheel is rotatably disposed on both sides below the mounting bracket and is coaxial with the welding torch. The bottom surface of the contour wheel is parallel to the bottom of the welding torch head.

[0011] Preferably, the welding end includes a welding head and a welding assembly that are slidably connected to the welding gun. A mounting rod is fixedly connected to the lower surface of the welding head. A fixing plate is fixedly connected to the surface of the mounting rod. An elastic pad is fixedly connected to one side of the upper surface of the fixing plate and fits against one side of the lower surface of the welding gun.

[0012] Preferably, the adaptive module further includes a first sensor fixedly connected to both sides of the welding torch and a second sensor for collecting information on the welding object in front of the welding torch and for collecting information on the welding object behind the welding torch. The first sensor and the second sensor detect the width of the curved portion as the welding torch moves.

[0013] Preferably, the drive module includes a bracket abutting against multiple intersections, two extension plates fixedly disposed on both sides of the bracket, a sliding groove formed on one of the extension plates, and mounting grooves formed on the two inner walls of the sliding groove. An adjustment frame is slidably connected to the upper surface of the bracket, and a linear drive unit is fixedly connected inside the adjustment frame. A fixing block is fixedly connected to the output end of the linear drive unit.

[0014] Preferably, the drive module further includes a linkage gear rotatably connected to the lower surface of the adjustment frame via a bearing and rotatably connected to the inside of the bracket. The bracket has a bracket gear arranged longitudinally inside, two adjacent bracket gears mesh with each other, and the linkage gear meshes with the bracket gear. One of the bracket gears is fixedly connected to an external drive source.

[0015] Preferably, the cleaning module includes an elastic sleeve fixedly connected inside the mounting groove, and a connecting pipe is fixedly connected to the opposite sides of the two elastic sleeves, with both ends of the connecting pipe connected to the opposite sides of the two elastic sleeves respectively. An exhaust pipe is fixedly connected to one side of one of the elastic sleeves, and the exhaust pipe is in contact with the lower surface of the bracket.

[0016] Preferably, the cleaning module further includes two limiting blocks fixedly connected to one side of the trigger unit, one end of the exhaust pipe passes through the two limiting blocks and is fixedly connected to the trigger unit, and the output end of the exhaust pipe is aligned with the weld.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This device, through the coordinated operation of multiple components in the overload protection module, ensures that when the welding torch is lifted to a height lower than the curve section during its passage over a curved section, the moving plate first contacts the curve section. Based on the power of the welding torch displacement, the moving plate slides on the lower surface of the mounting box, pushing the drive plate to rotate. This causes the limiting plate to move inside the mounting box, compressing the limiting spring and thus disengaging the limiting plate from the connecting plate. The limiting plate no longer limits the connecting plate. Through the elastic force of the damping spring, the adjusting frame moves along with the extension of the damping spring, further raising the height of the welding torch. This achieves immediate yielding and unloading, preventing the welding torch tip from contacting the fold edges of the folds, which could cause the folds to be dented, indented, or even torn or scratched. This device, through the coordination of multiple components in the adaptive module, allows the mounting frame and the contour wheel to move along with the welding torch during the welding process. When the contour wheel contacts the protrusion of the weld, it pushes the mounting frame and the welding torch upward. When the contour wheel contacts the depression of the weld, it drives the mounting frame and the welding torch downward, adjusting the gap between the welding torch tip and the protrusion. This ensures that the gap between the welding torch and the weld is always kept within a suitable range that prevents uneven weld penetration, achieving stable weld penetration, weld width, and forming, and avoiding the problem of some parts being fully penetrated while others are not. This device, through the coordinated operation of multiple components in the cleaning module, ensures that the welding torch maintains continuous welding of the weld seam during the movement of the contour wheel. Therefore, as the welding torch moves, it simultaneously drives the overload protection module to move on the bracket. The guide wheel squeezes the elastic sleeve, expelling the air inside through the connecting pipe and the exhaust pipe to the weld seam. This allows the air to blow onto the weld seam in front of the welding torch, preventing the contour wheel's lifting and lowering height from becoming mismatched with the weld seam height due to debris generated during welding adhering to the weld seam. This further ensures the uniformity of the weld penetration and width, as well as the stable forming effect. Attached Figure Description

[0018] Figure 1 This is a front structural diagram of an automatic corner welding device for LNG storage tanks proposed in this invention. Figure 2 This is a schematic diagram of the automatic welding equipment structure of an automatic welding device for the inner corner of an LNG storage tank proposed in this invention; Figure 3 This is a schematic diagram of the drive module and adaptive module structure of an automatic welding device for the inner corner of an LNG storage tank proposed in this invention. Figure 4 This is a schematic diagram of the adaptive module structure of an automatic welding device for the inner corner of an LNG storage tank proposed in this invention; Figure 5 This is a schematic diagram of the overload protection module structure of an automatic welding equipment for the inner corner of an LNG storage tank proposed in this invention; Figure 6 This is a schematic diagram of the drive module structure of an automatic welding device for the inner corner of an LNG storage tank proposed in this invention; Figure 7 This is a schematic diagram of the extension plate, damping spring, limiting plate, and mounting groove structure of an automatic welding device for the inner corner of an LNG storage tank proposed in this invention. Figure 8 This is a schematic diagram of the cleaning module, damping spring, and extension plate structure of an automatic welding equipment for the inner corner of an LNG storage tank proposed in this invention. Figure 9 This is a schematic diagram of the cleaning module structure of an automatic welding device for the inner corners of an LNG storage tank proposed in this invention.

[0019] In the diagram: 1. Retaining wall; 11. Curved section; 12. Straight section; 2. Automatic welding equipment; 21. Drive module; 211. Bracket; 212. Extension plate; 213. Mounting slot; 214. Adjustment frame; 215. Linear drive unit; 216. Linkage gear; 217. Bracket gear; 22. Overload protection module; 221. Limit plate; 222. Damping spring; 223. Connecting plate; 224. Limit spring; 225. Drive plate; 226. Trigger unit; 227. 1. Limiting box; 2262. Mounting box; 2263. Moving plate; 2264. Guide wheel; 23. Adaptive module; 231. Mounting bracket; 232. Contouring wheel; 233. Welding end; 2331. Welding head; 2332. Mounting rod; 234. Fixing plate; 235. Elastic pad; 236. First sensor; 237. Second sensor; 24. Cleaning module; 241. Elastic sleeve; 242. Connecting pipe; 243. Exhaust pipe; 244. Limiting block; 3. Welding torch. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0022] Reference Figures 1-9 An automatic welding device for the inner corner of an LNG storage tank includes: a retaining wall 1 composed of multiple curved portions 11, straight portions 12, and intersections formed by the intersection of curved portions 11 and straight portions 12, and thin sheets, and a welding torch 3. The surfaces of the multiple intersections are jointly provided with an automatic welding device 2. The automatic welding equipment 2 includes a drive module 21, an overload protection module 22, an adaptive module 23, and a cleaning module 24; The overload protection module 22 includes a limit plate 221, a damping spring 222, a connecting plate 223, a limit spring 224, a drive plate 225, and a trigger unit 226. In the initial state of the overload protection module 22, the limiting plate 221 is attached to the connecting plate 223, one end of the damping spring 222 is attached to one side of the lower surface of the connecting plate 223, and the connecting plate 223 is slidably sleeved on the surface of the damping spring 222. The limiting spring 224 is fixedly connected to the limiting plate 221 to provide support for the limiting plate 221, and the driving plate 225 is attached to the bottom of one side of the limiting plate 221. The trigger unit 226 includes a limit box 2261 that is slidably sleeved on the limit plate 221 and a mounting box 2262 that is parallel to and fixedly connected to the limit box 2261. The limit spring 224 is fixedly installed inside the mounting box 2262, and the limit plate 221 is slidably installed inside the mounting box 2262. The drive plate 225 is rotatably connected to the inside of the mounting box 2262 via a pin. The trigger unit 226 also includes a movable plate 2263 that is rotatably connected to the drive plate 225 via a pin and slidably connected to the lower surface of the mounting box 2262, and a guide wheel 2264 that is rotatably connected to the damping spring 222 via a pin. The bottom of the movable plate 2263 is parallel to the head of the welding torch 3, and the guide wheel 2264 is rotatably mounted on the surface of the drive module 21. The movable plate 2263 is located in front of the welding torch 3. During the movement of the welding torch 3, if a collision with a fold occurs, the movable plate 2263 will first collide with the fold, thereby triggering the overload protection module 22. The connecting plate 223 is fixedly connected to the adjusting bracket 214; In embodiments applying the above technical solution, during the height adjustment process of the welding torch 3 based on the detection results of the first sensor 236 and the second sensor 237, when the lifting height of the welding torch 3 is lower than the height of the curved portion 11, the welding torch 3 moves via the drive module 21, and the moving plate 2263 moves synchronously. Therefore, the moving plate 2263 first contacts the curved portion 11. Based on the displacement of the welding torch 3, the moving plate 2263 slides on the lower surface of the mounting box 2262, thereby pushing the drive plate 225 on the mounting box 2262. The rotation causes the limiting plate 221 to slide inside the mounting box 2262, compressing the limiting spring 224, causing the limiting plate 221 to disengage from the connecting plate 223 and no longer limit the connecting plate 223. As a result, the damping spring 222 extends upward, pushing the connecting plate 223 and the adjusting frame 214 to move upward synchronously, further raising the height of the welding torch 3, realizing immediate yielding and unloading, and avoiding the problem of the welding torch 3's nozzle contacting the fold edge of the fold, causing the fold to be pushed out with pits, indentations, or even torn or scratched. When the welding torch 3 moves upward via the damping spring 222, the welding torch 3 stops working. When the operator adjusts the position of the welding torch 3, the welding torch 3 is pressed downward, and the welding torch 3 drives the damping spring 222, the moving plate 2263, the limit spring 224 and the connecting plate 223 to reset. When the position adjustment of the welding torch 3 is completed, the damping spring 222, the moving plate 2263 and the connecting plate 223 and other structures are automatically reset. Reference Figures 2-4The adaptive module 23 includes a mounting bracket 231, a contour wheel 232, a welding end 233, a fixing plate 234, and an elastic pad 235 that are fixed to the surface of the welding torch 3 by bolts. The contour wheel 232 is rotatably disposed on both sides below the mounting bracket 231 and is on the same axis as the welding torch 3. The bottom surface of the contour wheel 232 is parallel to the bottom of the torch head of the welding torch 3. The contour wheel 232 is made of wear-resistant resin. It can rotate freely on the film without resistance and the pressure is 1-3N. The contact surface is smooth, the texture is relatively soft and wear-resistant. The welding end 233 includes a welding head 2331 that is slidably connected to the welding gun 3 and a welding assembly. The lower surface of the welding head 2331 is fixedly connected to an installation rod 2332. A fixing plate 234 is fixedly connected to the surface of the installation rod 2332. An elastic pad 235 is fixedly connected to one side of the upper surface of the fixing plate 234 and is in contact with one side of the lower surface of the welding gun 3. The welding assembly includes, but is not limited to, the wire drive unit for driving the wire to move and the power supply unit for providing power to the welding torch 3, all of which are existing technologies and are used to enable the welding torch 3 to weld the retaining wall 1. During the welding process of the welding torch 3, the mounting frame 231 and the contour wheel 232 move with the welding torch 3. When the contour wheel 232 contacts the protrusion of the weld, it pushes the mounting frame 231 and the welding torch 3 to move upward. The elastic pad 235 extends slightly upward at the same time to support the welding torch 3. When the contour wheel 232 contacts the depression of the weld, it drives the mounting frame 231 and the welding torch 3 to move downward. The elastic pad 235 compresses slightly downward at the same time to adjust the gap between the welding torch 3 tip and the protrusion, so that the gap between the welding torch 3 and the weld is always kept within a suitable range that will not result in uneven weld depth, thereby achieving the effects of weld depth, weld width and stable forming. Furthermore, the installation rod 2332 guides the displacement of the welding torch 3, preventing the welding torch 3 from shifting during movement due to the flexibility of the elastic pad 235. The elastic pad 235 is fixedly installed by setting the fixing plate 234; Reference Figure 2 and Figure 6 The drive module 21 includes a bracket 211 that abuts against multiple intersections, two extension plates 212 fixedly disposed on both sides of the bracket 211, a sliding groove opened on one of the extension plates 212, and mounting grooves 213 opened on the inner walls of the sliding groove. An adjustment frame 214 is slidably connected to the upper surface of the bracket 211. A linear drive unit 215 is fixedly connected inside the adjustment frame 214, and a fixing block is fixedly connected to the output end of the linear drive unit 215. The linear drive unit 215 can be a mechanical structure that can be linearly driven, such as an electric actuator; Based on the detection results of the first sensor 236 and the second sensor 237, the linear drive unit 215 is activated, so that its output end drives the fixed block and the welding end 233 to slide on the adjustment frame 214, thereby adjusting the height of the welding gun 3. The drive module 21 also includes a linkage gear 216 rotatably connected to the lower surface of the adjustment frame 214 via a bearing and rotatably connected to the inside of the bracket 211. A bracket gear 217 is longitudinally arranged inside the bracket 211. Two adjacent bracket gears 217 mesh with each other, and the linkage gear 216 meshes with the bracket gear 217. One of the bracket gears 217 is fixedly connected to an external drive source. When the welding torch 3 welds the straight section 12, the drive source drives one of the bracket gears 217 to rotate, thereby causing all the bracket gears 217 to rotate. At the same time, the linkage gear 216 rotates inside the bracket 211, and the adjustment frame 214 moves inside the bracket 211 based on the meshing of multiple gear teeth. This allows the welding torch 3 to move on the straight section 12 and achieve welding of the straight section 12. The adaptive module 23 also includes a first sensor 236 fixedly connected to both sides of the welding torch 3 and a second sensor 237 for collecting information on the welding object in front of the welding torch 3 and collecting information on the welding object behind the welding torch 3. The first sensor 236 and the second sensor 237 detect the width of the curve portion 11 as they move with the welding torch 3. The driving source is a servo motor, which is existing technology. The output end of the servo motor is fixedly connected to one of the bracket gears 217, which is used to drive all the bracket gears 217 to rotate, thereby driving the linkage gear 216 to move and driving the adjustment frame 214 to move. When the bracket 211 is welding in the first straight section 12 of the multiple straight sections 12, if the first sensor 236 detects the starting point of the first curved section 11 of the multiple curved sections 11, the information of the starting point detected by the first sensor 236 is transmitted to the drive module 21, so that the bracket 211 stops moving forward and stops welding, and the linear drive unit 215 is activated, so that its output end drives the welding end 233 to move upward, so that the welding gun 3 head rises to a height higher than the first curved section 11; If the welding torch 3 head rises to a height higher than the first curved section 11, the welding torch 3 head will be moved in the length direction by the drive module 21, so that the bracket 211 stops after moving forward. At this time, the distance that the bracket 211 moves from forward to stop can be set to a distance sufficient to cross the first section of the first fold in the first fold and the second fold that constitute the curved section 11; If the welding torch 3 head moves along the length direction and the width is greater than the first curved section 11, then the linear drive unit 215 is controlled to lower the welding torch 3 head to the second straight section 12 among the multiple straight sections 12. At this time, the lowering distance of the welding torch 3 head can be the same as the aforementioned rising distance. If the welding torch 3 head descends to the second straight section 12 among the multiple straight sections 12, the drive module 21 causes the bracket 211 to retract to the first curved section 11, so that the second sensor 237 detects the welding end point of the first curved section 11, and the welding torch 3 head starts working from the second straight section 12. As mentioned above, the curved portion 11 is composed of a first fold having a first height and a first width, and a second fold having a second height and a second width that intersects the first fold and is smaller in size than the first fold. The first sensor 236 and the second sensor 237 can identify whether the curve portion 11 is a first wrinkle or a second wrinkle based on the starting point information of the first curve portion 11 detected by the first sensor 236 and the ending point information of the first curve portion 11 detected by the second sensor 237. If the first sensor 236 and the second sensor 237 identify that the width between the start and end points of the first curved section 11 corresponds to the first width, then starting from the second curved section 11 and subsequent curved sections 11 among the plurality of curved sections 11, the welding torch 3 head will not exceed the height between the width of the first curved section 11 and the first width, and will not exceed the height of the first curved section 11, allowing travel. If the first sensor 236 and the second sensor 237 identify that the width between the start and end points of the first curved portion 11 corresponds to the second width, then starting from the second curved portion 11 and subsequent curved portions 11, the tip of the welding torch 3 will move between the second fold corresponding to the second height and the second width so as not to move in the curved portion 11. Furthermore, the first sensor 236 can be installed at a certain angle in front of the welding torch 3 head when the welding torch 3 head is aligned with the weld seam; The second sensor 237 can be installed at a certain angle behind the welding torch 3 head when the welding torch 3 head is aligned with the weld seam. Under the above circumstances, a certain angle can be used to determine the area in front of and behind the curved section 11, and a certain interval of the straight section 12 is the tolerance interval. Reference Figure 8 and Figure 9The cleaning module 24 includes an elastic sleeve 241 fixedly connected inside the mounting groove 213. The two elastic sleeves 241 are fixedly connected to the opposite sides of a connecting pipe 242, and the two ends of the connecting pipe 242 are respectively connected to the opposite sides of the two elastic sleeves 241. One side of one elastic sleeve 241 is fixedly connected to an exhaust pipe 243, and the exhaust pipe 243 is in contact with the lower surface of the bracket 211. The elastic sleeve 241 is made of rubber and is connected to the outside air through an existing rigid pipe. A one-way valve is installed inside the rigid pipe, allowing outside air to enter the elastic sleeve 241 through the rigid pipe. The air in the elastic sleeve 241 cannot be discharged through the rigid pipe. The exhaust pipe 243 is a flexible hose. When one end of the exhaust pipe 243 moves with the limiting plate 221, it will not obstruct the movement of the limiting plate 221. During the movement of the contour wheel 232, the welding torch 3 continues to weld the weld. Therefore, when the welding torch 3 moves, it simultaneously drives the overload protection module 22 to move on the bracket 211. The guide wheel 2264 squeezes the elastic sleeve 241, and discharges the air inside it to the weld through the connecting pipe 242 and the exhaust pipe 243. This allows the air to blow onto the weld in front of the welding torch 3, preventing the lifting and lowering height of the contour wheel 232 from being mismatched with the height of the weld due to the debris generated during welding by the welding torch 3 adhering to the weld. The cleaning module 24 also includes two limiting blocks 244 fixedly connected to one side of the trigger unit 226. One end of the exhaust pipe 243 passes through the two limiting blocks 244 and is fixedly connected to the trigger unit 226. The output end of the exhaust pipe 243 is aligned with the weld. The limiting block 244 is fixedly connected to the limiting box 2261, and the exhaust pipe 243 moves with the limiting box 2261; The limit block 244 is used to fix the exhaust pipe 243, so as to prevent the exhaust pipe 243 from shaking randomly due to the movement of the welding gun 3, which would affect the cleaning of the weld by the exhaust pipe 243.

[0023] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic corner welding device for LNG storage tanks, comprising: A retaining wall (1) and a welding torch (3), wherein the retaining wall (1) is composed of a curved part (11) suitable for the planar part of a liquefied gas storage tank, a straight part (12), an intersection formed by the intersection of the curved part (11) and the straight part (12), and a thin sheet, wherein an automatic welding device (2) is provided on the surface of a plurality of the intersections. The automatic welding equipment (2) includes a drive module (21), an overload protection module (22), an adaptive module (23), and a cleaning module (24). The overload protection module (22) includes a limit plate (221), a damping spring (222), a connecting plate (223), a limit spring (224), a drive plate (225), and a trigger unit (226). In the initial state of the overload protection module (22), the limiting plate (221) is attached to the connecting plate (223), one end of the damping spring (222) is attached to one side of the lower surface of the connecting plate (223), and the connecting plate (223) is slidably sleeved on the surface of the damping spring (222). The limiting spring (224) is fixedly connected to the limiting plate (221) to provide support for the limiting plate (221), and the driving plate (225) is attached to the bottom of one side of the limiting plate (221).

2. The automatic corner welding equipment for the inner corner of an LNG storage tank according to claim 1, characterized in that, The triggering unit (226) includes a limiting box (2261) slidably sleeved on the limiting plate (221) and an installation box (2262) arranged parallel to and fixedly connected to the limiting box (2261). The limiting spring (224) is fixedly arranged inside the installation box (2262), and the limiting plate (221) is slidably arranged inside the installation box (2262). The driving plate (225) is rotatably connected to the inside of the installation box (2262) through a pin.

3. The automatic corner welding equipment for the inner corner of an LNG storage tank according to claim 2, characterized in that, The trigger unit (226) further includes a movable plate (2263) that is rotatably connected to the drive plate (225) via a pin and slidably connected to the lower surface of the mounting box (2262), and a guide wheel (2264) that is rotatably connected to the damping spring (222) via a pin. The bottom of the movable plate (2263) is parallel to the head of the welding torch (3), and the guide wheel (2264) is rotatably mounted on the surface of the drive module (21).

4. The automatic corner welding equipment for the inner corner of an LNG storage tank according to claim 1, characterized in that, The adaptive module (23) includes a mounting bracket (231), a contour wheel (232), a welding end (233), a fixing plate (234), and an elastic pad (235) that are fixed to the surface of the welding torch (3) by bolts. The contour wheel (232) is rotatably disposed on both sides below the mounting bracket (231) and is on the same axis as the welding torch (3). The bottom surface of the contour wheel (232) is parallel to the bottom of the torch head of the welding torch (3).

5. The automatic corner welding equipment for the inner corner of an LNG storage tank according to claim 4, characterized in that, The welding end (233) includes a welding head (2331) slidably connected to the welding gun (3) and a welding assembly. The lower surface of the welding head (2331) is fixedly connected to an installation rod (2332). The fixing plate (234) is fixedly connected to the surface of the installation rod (2332). The elastic pad (235) is fixedly connected to one side of the upper surface of the fixing plate (234) and fits against one side of the lower surface of the welding gun (3).

6. The automatic corner welding equipment for the inner corner of an LNG storage tank according to claim 1, characterized in that, The adaptive module (23) further includes a first sensor (236) fixedly connected to both sides of the welding torch (3) and a second sensor (237) for collecting information on the welding object in front of the welding torch (3) and collecting information on the welding object behind the welding torch (3). The first sensor (236) and the second sensor (237) detect the width of the curve portion (11) as they move with the welding torch (3).

7. The automatic corner welding equipment for the inner corner of an LNG storage tank according to claim 1, characterized in that, The drive module (21) includes a bracket (211) abutting against multiple intersections, two extension plates (212) fixedly disposed on both sides of the bracket (211), a sliding groove opened on one of the extension plates (212), and mounting grooves (213) opened on the two inner walls of the sliding groove. An adjustment frame (214) is slidably connected to the upper surface of the bracket (211), and the adjustment frame (214) is fixedly connected to the connecting plate (223). A linear drive unit (215) is fixedly connected inside the adjustment frame (214), and a fixing block is fixedly connected to the output end of the linear drive unit (215).

8. The automatic corner welding equipment for the inner corner of an LNG storage tank according to claim 7, characterized in that, The drive module (21) also includes a linkage gear (216) rotatably connected to the lower surface of the adjustment frame (214) via a bearing and rotatably connected to the inside of the bracket (211). The bracket (211) has a bracket gear (217) arranged longitudinally inside. Two adjacent bracket gears (217) mesh with each other, and the linkage gear (216) meshes with the bracket gear (217). One of the bracket gears (217) is fixedly connected to an external drive source.

9. An automatic corner welding device for the inner corner of an LNG storage tank according to claim 7, characterized in that, The cleaning module (24) includes an elastic sleeve (241) fixedly connected inside the mounting groove (213). The two elastic sleeves (241) are fixedly connected to a connecting pipe (242) on opposite sides. The two ends of the connecting pipe (242) are respectively connected to the opposite sides of the two elastic sleeves (241). One side of one of the elastic sleeves (241) is fixedly connected to an exhaust pipe (243), and the exhaust pipe (243) is in contact with the lower surface of the bracket (211).

10. An automatic corner welding device for the inner corner of an LNG storage tank according to claim 9, characterized in that, The cleaning module (24) also includes two limiting blocks (244) fixedly connected to one side of the trigger unit (226). One end of the exhaust pipe (243) passes through the two limiting blocks (244) and is fixedly connected to the trigger unit (226), and the output end of the exhaust pipe (243) is aligned with the weld.

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