Stainless steel tank bottom ring welding device and system

Abstract

This invention relates to the field of welding equipment technology, specifically to a welding device and system for the bottom ring of a stainless steel storage tank. The welding device for the bottom ring of a stainless steel storage tank includes a tank bottom, a support, a welding mechanism, and an adjustment mechanism. The tank bottom includes multiple segments, the welding mechanism includes an outer sealing box and a welding torch, and the adjustment mechanism includes an inner sealing box, a push rod, a baffle plate, and a transmission assembly. During welding, the baffle plate is in close contact with the back of the weld seam of two segments to suppress the bulging of the molten pool metal and prevent the formation of a hump defect on the back of the weld seam. Furthermore, as the curvature of the welded segments gradually increases, the transmission assembly drives the push rod closer to the segments, thereby increasing the curvature of the baffle plate to adapt to the curvature changes of the segments and effectively preventing the liquid metal in the molten pool from leaking from the weld seam. This invention provides a welding device and system for the bottom ring of a stainless steel storage tank to solve the problem of hump formation in the molten pool during welding with existing welding devices.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and specifically to a welding device and system for the bottom ring of a stainless steel storage tank. Background Technology

[0002] Welding equipment is a technical device that uses heating, pressurization, or both to achieve atomic bonding between two or more separate metal workpieces, thereby forming a permanent connection. Its core purpose is to replace traditional mechanical methods such as riveting and bolting to create non-removable integrated structures that combine airtightness, watertightness, and high structural strength.

[0003] As a critical structural component of rockets, the manufacturing process of propellant tanks directly affects the launch cycle and cost. Currently, global research and development of next-generation propellant tank materials is ongoing, having progressed through four main stages: first-generation aluminum-magnesium alloys, second-generation aluminum-copper alloys, third-generation aluminum-lithium alloys, and fourth-generation composite materials. However, with advancements in reusable rocket technology, traditional lightweight aluminum alloys and composite materials are increasingly unable to fully meet the demands of next-generation technologies. Therefore, many rocket companies are turning their attention to stainless steel, a material already widely used in various industrial sectors. Due to its high melting point, stainless steel effectively resists the high-temperature frictional heat generated during atmospheric reentry, eliminating the need for complex heat treatment processes. After cold work hardening, the tensile strength and yield strength of stainless steel can reach twice that of aluminum alloys. While meeting the same performance requirements, it can significantly reduce component size, demonstrating broad application prospects.

[0004] The bottom ring of a storage tank is a crucial component, and its production process typically involves: flat plate molding, segmented assembly and welding, non-destructive testing of the weld seams, and machining to remove excess material. For stainless steel bottom rings, robotic arms are generally used for welding. However, as storage tank sizes increase, the stroke of ordinary robotic arms is insufficient to cover the entire weld seam. Custom-designed equipment is costly and requires significant investment, making it unaffordable for most companies. Furthermore, the longer the robotic arm, the greater its weight, leading to more severe losses in welding precision and a greater impact on weld quality.

[0005] For example, the invention patent application with publication number CN110856885A provides a laser-arc hybrid welding gas protection device and method. Under the constraint of the annular gas flow, the phenomenon of shielding gas dispersion is greatly improved, the concentration and cooling effect of the shielding gas at the weld are enhanced, and the protection effect on the high-temperature molten pool is better. However, laser-arc hybrid welding technology still has certain limitations. It is prone to producing a hump phenomenon in the molten pool on the back side of the welding position, which increases the complexity of subsequent processes. Summary of the Invention

[0006] This invention provides a welding device and system for the bottom ring of a stainless steel storage tank to solve the problem that the molten pool easily forms a hump during welding with existing welding devices.

[0007] The present invention provides a stainless steel storage tank bottom ring welding device and system, which adopts the following technical solution: A stainless steel storage tank bottom ring welding device includes a storage tank bottom, a support, a welding mechanism, and an adjustment mechanism. The storage tank bottom is semi-ellipsoidal and composed of multiple circumferentially distributed segments. The support is installed between two adjacent segments, and the weld between the two segments extends along the meridian direction of the storage tank bottom.

[0008] The welding mechanism is located on the outside of the tank bottom, and the adjustment mechanism is located on the inside of the tank bottom. Both the welding mechanism and the adjustment mechanism are movable along the extension direction of the weld. The welding mechanism includes an outer sealing box mounted on a support and abutting against the melon petals, and a welding torch located inside the outer sealing box.

[0009] The adjusting mechanism includes an inner sealing box, a push rod, a baffle plate, and a transmission assembly. The inner sealing box is mounted on a support and abuts against the melon petals. The push rod is perpendicular to the side of the inner sealing box that abuts against the melon petals and is slidably mounted on the inner sealing box along its own axial direction. The baffle plate is arc-shaped and elastic; its convex surface abuts against the melon petals and corresponds to the weld seam, used to suppress hump formation. The middle part of the concave surface of the baffle plate abuts against the push rod.

[0010] The transmission assembly drives the push rod to move. As the inner sealing box moves, the greater the curvature of the melon petals, the closer the transmission assembly drives the push rod to the petals, and the greater the curvature of the baffle plate becomes, to accommodate the changes in the petals' curvature. Both the outer and inner sealing boxes contain argon gas, providing gas protection for the weld.

[0011] Furthermore, the inner sealed box includes a first inner box and a first outer box, both of which abut against the melon petals. The first inner box is disposed inside the first outer box, and the push rod is slidably disposed inside the first inner box. A first gas inlet is provided on the first outer box for introducing argon gas into the first outer box. A first exhaust pipe is provided on the first outer box, with one end of the first exhaust pipe located inside the first inner box and communicating with the first inner box.

[0012] The outer sealed box includes a second inner box and a second outer box, both of which abut against the melon petals. The second inner box is located inside the second outer box. A second gas inlet is provided on the second outer box for introducing argon gas into it. A second exhaust pipe is provided on the second outer box, with one end of the second exhaust pipe inside the second inner box and connected to it.

[0013] Furthermore, both the first inner box and the first outer box can extend and retract along the axial direction of the push rod. When the inner sealing box moves, the greater the curvature of the melon petals, the shorter the length of the first inner box and the first outer box along the axial direction of the push rod.

[0014] The transmission assembly includes a first rack, a second rack, a first gear, and a compression spring. Both the first and second racks are arranged along the axial direction of the push rod and are distributed sequentially along a first direction. The first direction is perpendicular to the axial direction of the push rod and points gradually away from the center of the tank bottom. The first rack is fixedly mounted on the first outer casing, and the second rack is fixedly connected to the push rod.

[0015] A first gear is rotatably mounted on the first outer casing, and is positioned along a second direction perpendicular to the first direction and the axial direction of the push rod. The first gear meshes with a first rack and a second rack. When the distance between the first inner casing and the first outer casing decreases, the first rack drives the first gear to rotate, which in turn drives the push rod to move closer to the melon petals via the second rack. A compression spring connects the first outer casing and the first inner casing.

[0016] Furthermore, the end of the first suction pipe inside the first inner box is located on the side of the first inner box closer to the melon petals, facilitating the extraction of air from the first inner box. The end of the second suction pipe inside the second inner box is located on the side of the second inner box furthest from the melon petals, facilitating the extraction of air from the second inner box.

[0017] Furthermore, the adjusting mechanism also includes a first sealing assembly, which comprises two first sealing rubber plates and two second sealing rubber plates. The two first sealing rubber plates are fixedly disposed on both sides of the first inner box along the first direction and abut against the melon petals. The two second sealing rubber plates are fixedly disposed on both sides of the first outer box along the first direction and abut against the melon petals.

[0018] The welding mechanism includes a second sealing assembly, which comprises two third sealing rubber plates and two fourth sealing rubber plates. The two third sealing rubber plates are fixedly disposed on both sides of the second inner casing along the second direction and abut against the melon petals. The two fourth sealing rubber plates are fixedly disposed on both sides of the second outer casing along the second direction and abut against the melon petals.

[0019] Furthermore, the adjustment mechanism also includes a first mounting bracket, which is slidably mounted on the support, and an inner sealing box is mounted on the first mounting bracket. The welding mechanism also includes a second mounting bracket, which is slidably mounted on the support, and an outer sealing box is mounted on the second mounting bracket.

[0020] Furthermore, the stainless steel tank bottom ring welding device also includes a drive mechanism, which comprises two motors respectively mounted on a first mounting bracket and a second mounting bracket. Two transmission components are mounted on the brackets, located on the inner and outer sides of the tank bottom. Each transmission component includes two third racks, located on either side of the weld along a second direction, with the third racks parallel to the weld.

[0021] At least one rotating shaft is rotatably mounted on both the first and second mounting brackets, and the rotating shaft is positioned along a second direction. A second gear is mounted at both ends of each rotating shaft, and the second gear is coaxial with the rotating shaft. Each second gear meshes with a corresponding third rack, and each motor output shaft is connected to a rotating shaft.

[0022] Furthermore, the welding torch includes a laser welding head and an arc welding head, which are used for composite welding of the weld seam.

[0023] Furthermore, a protrusion is fixedly installed on the baffle plate, located on the side of the baffle plate away from the center of the tank bottom and within the weld seam. The protrusion is used to position the baffle plate.

[0024] A stainless steel storage tank bottom ring welding system includes a stainless steel storage tank bottom ring welding device, a base and a support column. The support column is fixedly installed on the base and is coaxial with the bottom of the storage tank. One side of the support is fixedly connected to the base and the other side of the support is fixedly connected to the support column.

[0025] The beneficial effects of the present invention are as follows: The stainless steel storage tank bottom ring welding device of the present invention, through the welding mechanism and the adjustment mechanism, during the welding process, the baffle plate is closely attached to the back of the weld of the two melon-shaped pieces, which suppresses the bulging of the molten pool metal, prevents the formation of hump defects on the back of the weld, and reduces subsequent finishing processes.

[0026] As the inner and outer sealing boxes move, the curvature of the welded petals gradually increases. The more the transmission component drives the push rod towards the petal, the greater the curvature of the baffle plate becomes. This adapts to the curvature changes of the petal, effectively preventing liquid metal in the molten pool from leaking from the weld. While ensuring the quality of the weld formation, it also compensates for the decrease in accuracy caused by insufficient stroke and rigidity of conventional robotic arms. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a stainless steel storage tank bottom ring welding device and system provided in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is a partial structural schematic diagram of a stainless steel storage tank bottom ring welding device and system provided in an embodiment of the present invention;

[0031] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0032] Figure 5 A top view of a stainless steel storage tank bottom ring welding device and system provided in an embodiment of the present invention;

[0033] Figure 6 for Figure 5 A cross-sectional view along the CC direction;

[0034] Figure 7 for Figure 6 Enlarged view at point D;

[0035] Figure 8 An exploded view of the welding mechanism of a stainless steel storage tank bottom ring welding device provided in an embodiment of the present invention;

[0036] Figure 9 An exploded view of the adjustment mechanism of a stainless steel storage tank bottom ring welding device provided in an embodiment of the present invention;

[0037] Figure 10 This is a partial structural schematic diagram of the adjustment mechanism of a stainless steel storage tank bottom ring welding device provided in an embodiment of the present invention.

[0038] In the diagram: 101, bracket; 102, melon petal; 103, traveling wheel; 106, motor; 107, hydraulic rod; 108, arc welding head; 109, laser welding head; 110, second outer casing; 1101, fourth sealing rubber plate; 1102, second inner casing; 1103, third sealing rubber plate; 1104, second air inlet; 1105, second exhaust pipe; 111, first outer casing; 1111, second sealing rubber plate; 112, the... 1. Inner box; 1113. First sealing rubber plate; 1114. First air inlet; 1115. First air extraction pipe; 113. Baffle plate; 1131. Protrusion; 114. Top rod; 115. Compression spring; 116. First gear; 117. First rack; 118. Second rack; 200. First mounting bracket; 210. Second mounting bracket; 211. Rotating shaft; 220. Movable box; 230. Second gear; 300. Base; 310. Support column. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Reference Figures 1 to 10 As shown in the figure, an embodiment of the present invention provides a stainless steel storage tank bottom ring welding device, including a storage tank bottom, a support 101, a welding mechanism, and an adjustment mechanism. The storage tank bottom is semi-ellipsoidal and consists of multiple circumferentially distributed petals 102. The convex surface of the storage tank bottom is the outer side of the storage tank bottom, and the concave surface of the storage tank bottom is also the outer side of the storage tank bottom.

[0041] The bracket 101 is installed between two adjacent melon segments 102, and the weld between the two melon segments 102 extends along the meridian direction of the bottom of the storage tank. For example... Figure 1 As shown, during operation, the convex surface of the tank bottom faces upwards, and the concave surface faces downwards. The meridian direction of the tank bottom is from the highest point of the tank bottom to the four walls of the tank bottom.

[0042] The welding mechanism is located on the outside of the tank bottom, and the adjustment mechanism is located on the inside of the tank bottom. Both the welding mechanism and the adjustment mechanism are movable along the extension direction of the weld. The welding mechanism includes an outer sealing box mounted on the support 101 and abutting against the melon petal 102, and a welding torch located inside the outer sealing box.

[0043] The adjustment mechanism includes an inner sealing box, a push rod 114, a baffle plate 113, and a transmission assembly. The inner sealing box is mounted on the bracket 101 and abuts against the petal 102. The push rod 114 is perpendicular to the side of the inner sealing box that abuts against the petal 102 and is slidably mounted on the inner sealing box along its own axial direction. The baffle plate 113 is arc-shaped and elastic; its convex surface abuts against the petal 102 and corresponds to the weld seam, used to suppress hump formation. The middle of the concave surface of the baffle plate 113 abuts against the push rod 114. The closer the push rod 114 is to the petal 102, the greater the curvature of the baffle plate 113.

[0044] The transmission assembly drives the push rod 114 to move. As the inner sealing box moves, the greater the curvature of the petal 102, the closer the transmission assembly drives the push rod 114 to the petal 102, and the greater the curvature of the baffle plate 113 becomes, to accommodate the change in curvature of the petal 102. Both the outer and inner sealing boxes contain argon gas, providing gas protection for the weld.

[0045] The welding torch is activated, and the torch begins welding the seam. Simultaneously, the inner and outer sealing boxes are moved along the weld seam and gradually away from the center of the tank bottom, thereby gradually welding the two adjacent segments 102 into one piece. During the welding process, the baffle plate 113 is pressed against the back of the weld seam of the two segments 102. Its function is to suppress the bulging of the molten pool metal, prevent the formation of hump defects on the back of the weld seam, and reduce subsequent finishing processes.

[0046] As the inner and outer sealing boxes move, the curvature of the welded petal 102 gradually increases. The more the transmission assembly drives the push rod 114 towards the petal 102, the greater the curvature of the baffle plate 113 becomes. This adapts to the curvature changes of the petal 102, effectively preventing liquid metal in the molten pool from leaking from the weld. While ensuring the quality of the weld formation, this also compensates for the decreased precision caused by insufficient stroke and rigidity in conventional robotic arms.

[0047] In this embodiment, the inner sealed box includes a first inner box 112 and a first outer box 111, both of which abut against the melon petals 102. The first inner box 112 is disposed inside the first outer box 111, and the push rod 114 is slidably disposed inside the first inner box 112. The first outer box 111 has a first gas inlet 1114 for introducing argon gas into the first outer box 111. The first outer box 111 is provided with a first exhaust pipe 1115, one end of which is located inside the first inner box 112 and communicates with the first inner box 112.

[0048] The outer sealed box includes a second inner box 1102 and a second outer box 110, both of which abut against the melon petals 102. The second inner box 1102 is disposed inside the second outer box 110. A second gas inlet 1104 is provided on the second outer box 110 for introducing argon gas into the second outer box 110. A second exhaust pipe 1105 is provided on the second outer box 110, one end of which is located inside the second inner box 1102 and connected to the second inner box 1102. The pressure inside the second outer box 110 is greater than the pressure inside the first outer box 111.

[0049] The support 101 is equipped with a first air pump and a second air pump. The first air pump is connected to a first air inlet 1114 and a second air inlet 1104 via two first air pipes, respectively, for supplying argon gas into the inner and outer sealed boxes. The second air pump is connected to a first extraction pipe 1115 and a second extraction pipe 1105 via two second air pipes, respectively, for extracting gas from the inner and outer sealed boxes.

[0050] In this embodiment, both the first inner box 112 and the first outer box 111 can extend and retract along the axial direction of the top rod 114. When the inner sealing box moves, the greater the curvature of the melon petal 102, the shorter the length of the first inner box 112 and the first outer box 111 along the axial direction of the top rod 114.

[0051] The transmission assembly includes a first rack 117, a second rack 118, a first gear 116, and a compression spring 115. Both the first rack 117 and the second rack 118 are arranged along the axial direction of the push rod 114 and are distributed sequentially along a first direction. The first direction is perpendicular to the axial direction of the push rod 114 and points gradually away from the center of the tank bottom. The first rack 117 is fixedly mounted on the first outer casing 111, and the second rack 118 is fixedly connected to the push rod 114.

[0052] A first gear 116 is rotatably mounted on the first outer casing 111. The first gear 116 is positioned along a second direction, which is perpendicular to the first direction and the axial direction of the push rod 114. The first gear 116 meshes with a first rack 117 and a second rack 118. When the distance between the first inner casing 112 and the first outer casing 111 decreases, the first rack 117 drives the first gear 116 to rotate in the forward direction, which in turn drives the push rod 114 to move closer to the melon petal 102 via the second rack 118. A compression spring 115 is positioned along the direction of the push rod 114 and connects the first outer casing 111 and the first inner casing 112.

[0053] As the inner sealed box moves, the curvature of the welded melon petals 102 gradually increases. This change in curvature compresses the first inner box 112 and the first outer box 111, causing their lengths along the axial direction of the push rod 114 to become shorter. This compression causes the first rack 117 to shift, rotating the first gear 116 it meshes with. This rotation, through the second rack 118, pushes the push rod 114 towards the melon petals 102.

[0054] In this embodiment, the first suction pipe 1115 is located at the front side of the first inner box 112 in the direction of movement, and the end of the first suction pipe 1115 inside the first inner box 112 is located on the side of the first inner box 112 close to the melon petal 102, so as to facilitate the extraction of air from the first inner box 112.

[0055] The second suction pipe 1105 is located on the rear side of the second inner box 1102 in the direction of movement, and the end of the second suction pipe 1105 inside the second inner box 1102 is located on the side of the second inner box 1102 away from the melon petal 102, so as to facilitate the extraction of air from the second inner box 1102.

[0056] During welding, the welding mechanism and the adjustment mechanism are arranged vertically. Utilizing the fact that argon gas is denser than air, the air in the first inner chamber 112 concentrates on the side closer to the petal 102, while the air in the second inner chamber 1102 concentrates on the side farther from the petal 102. Therefore, the end of the first extraction pipe 1115 inside the first inner chamber 112 is located on the side of the first inner chamber 112 closer to the petal 102, and the end of the second extraction pipe 1105 inside the second inner chamber 1102 is located on the side of the second inner chamber 1102 farther from the petal 102. This efficiently removes the rising air from the first and second inner chambers 112, ensuring the purity of the protective gas in the weld area.

[0057] Meanwhile, since the first suction pipe 1115 is located at the front of the first inner box 112 in the direction of movement, during the suction process, the first suction pipe 1115 can guide the heated gas to flow to and contact the protrusion 1131 on the baffle plate 113. After absorbing heat, the protrusion 1131 can preheat the area of ​​the melon petal 102 to be welded in front, thereby improving the welding processability.

[0058] In this embodiment, the first inner box 112 has first grooves on both sides along the first direction, and the first outer box 111 has second grooves on both sides along the first direction. The adjustment mechanism also includes a first sealing assembly, which includes two first sealing rubber plates 1113 and two second sealing rubber plates 1111. Each first sealing rubber plate 1113 is disposed in a first groove and abuts against the petal 102. Each second sealing rubber plate 1111 is disposed in a second groove and abuts against the petal 102.

[0059] Since the inner side of the bottom of the storage tank is concave, the distance between the two sides of the first inner box 112 and the melon petal 102 along the first direction is less than the distance between the first inner box 112 and the melon petal 102. Therefore, by means of the first sealing rubber plate 1113, during installation, the first sealing rubber plate 1113 deforms, thereby causing the middle part of the first inner box 112 to abut against the melon petal 102, and at the same time, the first sealing rubber plate 1113 forms a seal.

[0060] The second inner box 1102 has third grooves on both sides along the second direction, and the second outer box 110 has fourth grooves on both sides along the second direction. The welding mechanism includes a second sealing assembly, which includes two third sealing rubber plates 1103 and two fourth sealing rubber plates 1101. Each third sealing rubber plate 1103 is disposed in a third groove and abuts against the petal 102. Each fourth sealing rubber plate 1101 is disposed in a fourth groove and abuts against the petal 102.

[0061] Since the outer side of the bottom of the storage tank is convex, the distance between the second inner box 1102 and the melon petal 102 along both sides of the first direction is greater than the distance between the middle of the first inner box 112 and the melon petal 102. Therefore, through the third sealing rubber plate 1103 set in the third groove, during installation, the third sealing rubber plate 1103 deforms, thereby causing the second inner box 1102 to abut against the melon petal 102 along both sides of the first direction, while the third sealing rubber plate 1103 forms a seal.

[0062] In this embodiment, the adjustment mechanism further includes a first mounting bracket 200, which is slidably mounted on the bracket 101, and an inner sealing box is mounted on the first mounting bracket 200. The welding mechanism further includes a second mounting bracket 210, which is slidably mounted on the bracket 101, and an outer sealing box is fixedly mounted on the second mounting bracket 210.

[0063] The first inner box 112 includes a first fixed box and a first sliding box. The first fixed box is fixedly mounted on the first mounting frame 200, and the first sliding box is slidably mounted on the first fixed box and abuts against the melon petals 102. The first outer box 111 includes a second fixed box and a second sliding box. The second fixed box is fixedly mounted on the first mounting frame 200, and the second sliding box is slidably mounted on the second fixed box and abuts against the melon petals 102.

[0064] In this embodiment, a stainless steel storage tank bottom ring welding device further includes a drive mechanism, which includes two motors 106, which are respectively mounted on the first mounting frame 200 and the second mounting frame 210.

[0065] The support 101 is equipped with two transmission assemblies, which are located on the inner and outer sides of the bottom of the storage tank, respectively. Each transmission assembly includes two third racks, which are located on both sides of the weld along the second direction, and the third racks are parallel to the weld.

[0066] At least one rotating shaft 211 is rotatably mounted on both the first mounting bracket 200 and the second mounting bracket 210, and the rotating shaft 211 is arranged along a second direction. A second gear 230 is provided at both ends of the rotating shaft 211, and the second gear 230 is coaxial with the rotating shaft 211. Each second gear 230 meshes with a corresponding third rack, and each motor 106 output shaft is connected to a rotating shaft 211. Multiple traveling wheels 103 are provided on both the first mounting bracket 200 and the second mounting bracket 210, and the traveling wheels 103 are in sliding contact with the bracket 101.

[0067] Two motors 106 are started, and the motors 106 drive the rotating shaft 211 to rotate. When the rotating shaft 211 rotates, the first mounting bracket 200 and the second mounting bracket 210 move along the weld seam and gradually away from the center of the bottom of the storage tank through the cooperation of the second gear 230 and the third rack.

[0068] In this embodiment, a movable box 220 is provided on the second mounting bracket 210, and the movable box 220 slides along the first direction. One end of the welding torch is fixedly mounted on the movable box 220, and the other end of the welding torch slides inside the outer sealed box. A hydraulic rod 107 is provided on the second mounting bracket 210, and the hydraulic rod 107 is arranged along the first direction. The extended end of the hydraulic rod 107 is fixedly connected to the movable box 220.

[0069] The welding torch includes a laser welding head 109 and an arc welding head 108, which are used for laser-arc hybrid welding of the weld seam.

[0070] In this embodiment, during welding, both the inner and outer sealing boxes move in a direction away from the center of the tank bottom. A protrusion 1131 is fixedly provided on the baffle plate 113, located on the side of the baffle plate 113 away from the center of the tank bottom and within the weld seam. The protrusion 1131 is used to position the baffle plate 113, ensuring that the baffle plate 113 corresponds to the weld seam. The protrusion 1131 can transfer the heat absorbed by the baffle plate 113 to the area to be welded on the melon petal 102, thus serving a preheating function.

[0071] A stainless steel storage tank bottom ring welding system includes a stainless steel storage tank bottom ring welding device, a base 300 and a support column 310. The support column 310 is fixedly installed on the base 300 and is coaxial with the bottom of the storage tank. One side of the bracket 101 is fixedly connected to the base 300 and the other side of the bracket 101 is fixedly connected to the support column 310.

[0072] Working process: First, the two melon petals 102 are fixed between the welding mechanism and the adjustment mechanism respectively, while ensuring that the protrusions 1131 on the blocking plate 113 are accurately embedded in the weld. Then, the hydraulic rod 107 is activated, which pushes the movable box 220 and the welding torch mounted on it to move until the welding torch is precisely aligned with the weld. Next, the laser welding head 109 and the arc welding head 108 are activated simultaneously to begin laser-arc hybrid welding of the weld.

[0073] Simultaneously, two motors 106 are activated, driving the rotating shaft 211 to rotate. As the shaft 211 rotates, the interaction of the second gear 230 and the third rack causes the first mounting bracket 200 and the second mounting bracket 210 to move along the weld seam and gradually away from the center of the tank bottom, thereby gradually welding the two adjacent melon-shaped pieces 102 into a single unit. During the welding process, the baffle plate 113 is pressed tightly against the back of the weld seam of the two melon-shaped pieces 102, its function being to suppress the bulging of the molten pool metal and prevent hump defects from forming on the back of the weld seam.

[0074] During the movement of the first mounting bracket 200 and the second mounting bracket 210, the curvature of the welded petal 102 gradually increases. This change in curvature exerts pressure on the first inner box 112 and the first outer box 111, causing the lengths of the first inner box 112 and the first outer box 111 along the axial direction of the push rod 114 to become shorter. This pressure causes the first rack 117 to shift, driving the first gear 116 meshing with it to rotate, which in turn drives the push rod 114 to move closer to the petal 102 via the second rack 118. The push rod 114 pushes against the middle of the baffle plate 113, increasing the curvature of the baffle plate 113, thereby dynamically conforming to the curvature change of the petal 102 and effectively preventing the molten metal in the weld pool from leaking out of the weld.

[0075] Simultaneously with starting the welding torch, the first and second air pumps are activated. The first air pump supplies argon gas into the first outer casing 111 and the second outer casing 110 through the first air inlet 1114 and the second air inlet 1104, respectively. The second air pump continuously extracts gas from the first inner casing 112 and the second inner casing 1102 through the first extraction pipe 1115 and the second extraction pipe 1105.

[0076] Because the melon petal 102 has a curved structure, some of the argon gas inside the first outer box 111 escapes outward from the gap between the first outer box 111 and the melon petal 102, while another portion of the argon gas is drawn into the first inner box 112 under the negative pressure created by the first inner box 112. Through this process, the air inside the first outer box 111 and the first inner box 112 is effectively replaced with an argon gas environment.

[0077] Therefore, some of the argon gas inside the second outer casing 110 escapes outward from the gap between the second outer casing 110 and the melon petal 102, while another portion of the argon gas is drawn into the second inner casing 1102 under the negative pressure created by the second inner casing 1102. The air inside the second outer casing 110 and the second inner casing 1102 is expelled, ultimately creating an argon gas environment between the second outer casing 110 and the second inner casing 1102, effectively isolating the air and preventing oxidation of the weld.

[0078] Furthermore, due to the pressure difference between the second outer casing 110 and the first outer casing 111, the argon gas in the second outer casing 110 will enter the first outer casing 111, further venting the air between the weld seams and assisting in the removal of bubbles from the molten pool. Simultaneously, the first extraction pipe 1115 and the second extraction pipe 1105 are also responsible for timely extraction of harmful fumes and exhaust gases generated during the welding process, thereby improving the working environment and protecting the health of operators.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for the bottom ring of a stainless steel storage tank, characterized in that: It includes the tank bottom, support, welding mechanism and adjustment mechanism; the tank bottom is semi-ellipsoidal and consists of multiple circumferentially distributed petals; the support is installed between two adjacent petals, and the weld between the two petals extends along the meridian direction of the tank bottom; The welding mechanism is located on the outside of the bottom of the storage tank, and the adjustment mechanism is located on the inside of the bottom of the storage tank; both the welding mechanism and the adjustment mechanism can move along the extension direction of the weld; the welding mechanism includes an outer sealing box set on the support and abutting against the melon petals, and a welding torch inside the outer sealing box. The adjustment mechanism includes an inner sealing box, a push rod, a baffle plate, and a transmission assembly; the inner sealing box is mounted on a bracket and abuts against the melon petals; the push rod is perpendicular to the side of the inner sealing box that abuts against the melon petals and can slide along its own axis on the inner sealing box; the baffle plate is arc-shaped and elastic, with its convex surface abutting against the melon petals and corresponding to the weld seam, used to suppress hump formation; the middle part of the concave surface of the baffle plate abuts against the push rod; The transmission assembly is used to drive the push rod to move; when the inner sealing box moves, the greater the curvature of the melon petal, the more the transmission assembly drives the push rod to move closer to the melon petal, and the greater the curvature of the baffle plate to adapt to the curvature change of the melon petal; both the outer and inner sealing boxes contain argon gas to provide gas protection for the weld. A protrusion is fixedly installed on the baffle plate. The protrusion is located on the side of the baffle plate away from the center of the bottom of the storage tank and is located in the weld seam; the protrusion is used to position the baffle plate.

2. The stainless steel storage tank bottom ring welding device according to claim 1, characterized in that: The inner sealed box includes a first inner box and a first outer box that both abut against the melon petals. The first inner box is located inside the first outer box, and the top rod is slidably located inside the first inner box. A first gas inlet is provided on the first outer box for introducing argon gas into the first outer box. A first gas extraction pipe is provided on the first outer box, and one end of the first gas extraction pipe is located inside the first inner box and is connected to the first inner box. The outer sealed box includes a second inner box and a second outer box that both abut against the melon petals. The second inner box is located inside the second outer box. The second outer box has a second gas inlet for introducing argon gas into the second outer box. The second outer box is equipped with a second exhaust pipe, one end of which is located inside the second inner box and connected to the second inner box.

3. The stainless steel storage tank bottom ring welding device according to claim 2, characterized in that: Both the first inner box and the first outer box can extend and retract along the axial direction of the top rod; when the inner sealing box moves, the greater the curvature of the melon petals, the shorter the length of the first inner box and the first outer box along the axial direction of the top rod. The transmission assembly includes a first rack, a second rack, a first gear, and a compression spring; the first rack and the second rack are both arranged along the axial direction of the push rod and are distributed sequentially along a first direction; the first direction is perpendicular to the axial direction of the push rod and points in a direction that gradually moves away from the center of the bottom of the storage tank; the first rack is fixedly mounted on the first outer casing, and the second rack is fixedly connected to the push rod; The first gear is rotatably mounted on the first outer box. The first gear is positioned along a second direction, which is perpendicular to the first direction and the axial direction of the push rod. The first gear meshes with the first rack and the second rack. When the distance between the first inner box and the first outer box decreases, the first gear is driven to rotate through the first rack, which in turn drives the push rod to move closer to the melon petals through the second rack. A compression spring connects the first outer box and the first inner box.

4. The stainless steel storage tank bottom ring welding device according to claim 3, characterized in that: The end of the first suction pipe inside the first inner box is located on the side of the first inner box closer to the melon petals, which facilitates the extraction of air from the first inner box; the end of the second suction pipe inside the second inner box is located on the side of the second inner box farther from the melon petals, which facilitates the extraction of air from the second inner box.

5. The stainless steel storage tank bottom ring welding device according to claim 3, characterized in that: The adjustment mechanism also includes a first sealing assembly, which includes two first sealing rubber plates and two second sealing rubber plates; the two first sealing rubber plates are fixedly disposed on both sides of the first inner box along the first direction and abut against the melon petals; the two second sealing rubber plates are fixedly disposed on both sides of the first outer box along the first direction and abut against the melon petals. The welding mechanism includes a second sealing assembly, which includes two third sealing rubber plates and two fourth sealing rubber plates; the two third sealing rubber plates are fixedly disposed on both sides of the second inner box along the second direction and abut against the melon petals; the two fourth sealing rubber plates are fixedly disposed on both sides of the second outer box along the second direction and abut against the melon petals.

6. The stainless steel storage tank bottom ring welding device according to claim 3, characterized in that: The adjustment mechanism also includes a first mounting bracket, which is slidably mounted on the support, and an inner sealing box is mounted on the first mounting bracket; the welding mechanism also includes a second mounting bracket, which is slidably mounted on the support, and an outer sealing box is mounted on the second mounting bracket.

7. The stainless steel storage tank bottom ring welding device according to claim 6, characterized in that: It also includes a drive mechanism, which includes two motors, which are respectively mounted on a first mounting bracket and a second mounting bracket; two transmission components are mounted on the bracket, which are respectively located on the inner and outer sides of the bottom of the storage tank; each transmission component includes two third racks, which are respectively located on both sides of the weld along the second direction, and the third racks are parallel to the weld. At least one rotating shaft is rotatably mounted on both the first and second mounting brackets, and the rotating shaft is arranged along the second direction; a second gear is provided at both ends of the rotating shaft, and the second gear is coaxial with the rotating shaft; each second gear meshes with a corresponding third rack, and each motor output shaft is connected to a rotating shaft.

8. The stainless steel storage tank bottom ring welding device according to claim 1, characterized in that: The welding torch includes a laser welding head and an arc welding head, which are used for composite welding of weld seams.

9. A stainless steel storage tank bottom ring welding system, comprising the stainless steel storage tank bottom ring welding device according to any one of claims 1-8, characterized in that: It also includes a base and a support column. The support column is fixedly installed on the base and is coaxial with the bottom of the storage tank. One side of the bracket is fixedly connected to the base, and the other side of the bracket is fixedly connected to the support column.

Images