Stainless steel pressure tank ring seam welding device

Abstract

This invention relates to the field of welding machinery technology and discloses a circumferential seam welding device for stainless steel pressure tanks. To address the problem of circumferential seam misalignment caused by incomplete circumferential seam limiting during the connection of the tank body and tank head, a cylindrical structure composed of a main positioning seat and a secondary positioning seat is used to comprehensively fit and limit the circumferential seam between the tank body and the tank head. This ensures that the center lines of the tank body and the tank head are aligned, and their ends can fully abut together, preventing circumferential seam misalignment. Simultaneously, a welding arc groove is provided between the main positioning seat and the secondary positioning seat. This groove allows the arc welding gun assembly to directly reach a specific circumferential seam point. After the main and secondary positioning seats limit the tank body and the tank head, the arc welding gun assembly welds the fully limited circumferential seam. Finally, the pressure plate clamps and rotates the tank body and the tank head, causing the arc welding gun assembly to weld the circumferential seam between the tank body and the tank head, ultimately achieving the effect of circumferential seam pre-limitation.

Description

Technical Field

[0001] This invention relates to the field of welding machinery, and in particular to a device for welding circumferential seams of stainless steel pressure tanks. Background Technology

[0002] Stainless steel pressure tanks are pressure vessels made of high-strength, corrosion-resistant stainless steel. They possess excellent sealing and pressure resistance, and typically feature a fully enclosed internal design to effectively prevent water contamination and the intrusion of harmful substances. They are widely used in the pharmaceutical, food, and chemical industries.

[0003] In the production process of pressure vessels, a key step is to firmly connect the vessel body and the vessel head using welding technology to form a complete and sealed vessel structure. To address this need, a search revealed that publication number CN215902962U discloses an automatic displacement device for circumferential seam welding of pressure vessels. This device includes a roller mounting frame on a support frame, with a drive motor and an active roller mounted on the roller mounting frame. The active roller drives the pressure vessel to rotate, allowing the welding torch to weld at the circumferential seam on the pressure vessel. After one full rotation of the pressure vessel driven by the active roller, one circumferential seam is welded. This eliminates the need for manual welding around the circumferential seam, significantly improving welding efficiency.

[0004] However, during actual implementation, the applicant discovered that traditional circumferential welding relies on an active component to rotate the outer side of the tank, requiring a high degree of curvature on the outer side of the tank. Local deformation of the tank can lead to misalignment at the connection points, affecting weld quality. Furthermore, existing welding methods primarily rely on the shape of the tank itself for positioning, ensuring initial alignment of the circumferential seam points through point-by-point fixing. However, in actual circumferential welding, not all circumferential seams on the tank and tank body are properly positioned. This allows misaligned areas to shift during the continuous rotation of the circumferential seam. Once this shift occurs, the welded portion fixes the tank in an incorrect position, making subsequent correction difficult and ultimately hindering effective adjustment of the welding misalignment, thus affecting the overall quality of the pressure tank. Summary of the Invention

[0005] This invention proposes a stainless steel pressure tank circumferential weld device, which has the advantage of circumferential pre-limiting, to solve the problem of circumferential seam displacement caused by incomplete circumferential seam limiting when connecting the tank body to the tank body mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a stainless steel pressure tank circumferential seam welding device, comprising: a base, on which a main positioning seat and a secondary positioning seat are movably mounted via a support shaft seat, the main positioning seat and the secondary positioning seat being coaxially fastened together, and welding arc grooves being opened on the outer bottom of both the main positioning seat and the secondary positioning seat, and an arc welding gun assembly passing through the welding arc grooves being fixedly mounted on the bottom of the base; a gantry transport assembly, on which a pressure plate driven by a shifting motor is mounted; after the robot arm inserts the tank body and the can head into the inner side of the main positioning seat and the secondary positioning seat respectively, the gantry transport assembly uses the pressure plate to squeeze the ends of the tank body and the can head, thereby achieving coaxial fitting and limiting of the tank body and the can head with the main positioning seat and the secondary positioning seat; when the shifting motor drives the tank body and the can head to rotate according to the pressure plate, the arc welding gun assembly performs welding on the circumferential seam between the tank body and the can head.

[0007] Furthermore, a support guide wheel frame is installed on the surface of the base.

[0008] Furthermore, the ends of the can body and the can head to be welded are provided with bevels. When the ends of the can body and the can head are brought close together, a molten pool is formed between the bevels.

[0009] Furthermore, positioning arc grooves are provided at the ends of both the can body and the can head. The positioning arc grooves are semi-circular grooves. A positioning rod is movably installed on the outer side of the main positioning seat, and a spring is provided between the main positioning seat and the positioning rod. After the positioning arc grooves at the ends of the can body and the can head abut against the positioning rod, the circumferential seam at the ends of the can body and the can head aligns with the arc welding gun assembly.

[0010] Furthermore, a reset ring frame is fixed to the surface of the base, and a reset arc frame is fastened to the outer side of the reset ring frame. A roller is installed at the end of the positioning rod. When the positioning rod drives the main positioning seat to rotate, the roller at the end of the positioning rod moves along the outer arc side of the reset arc frame, so that the positioning rod moves radially outward along the main positioning seat.

[0011] Furthermore, a grinding wheel located at the end of the welding arc groove is movably installed between the main positioning seat and the auxiliary positioning seat, and a grinding motor that drives the grinding wheel is fixedly installed on the auxiliary positioning seat.

[0012] Furthermore, a start switch is fixedly installed at the end of the reset arc frame, and the start switch is pressed to start the grinding motor.

[0013] The present invention has the following beneficial effects:

[0014] This invention provides a stainless steel pressure tank circumferential seam welding device, which forms a cylindrical limiting structure through a main positioning seat and a secondary positioning seat. During the welding preparation stage, the cylindrical structure is fitted onto the circumferential seam connection between the tank body and the tank head. This not only ensures precise alignment of the center lines of the tank body and the tank head, avoiding welding quality problems caused by center offset, but also ensures that the ends of the tank body and the tank head are fully abutted together, fundamentally solving the problem of circumferential seam offset.

[0015] Meanwhile, welding arc grooves are provided on the main and auxiliary positioning seats. This allows the arc welding gun assembly to reach a specific point on the circumferential seam. In actual operation, after the main and auxiliary positioning seats have firmly positioned the can body and can head, the arc welding gun assembly can then perform welding operations on the fully positioned circumferential seam.

[0016] Finally, to achieve continuous welding of the circumferential seam, a stable clamping force is applied between the can body and the can head by a pressure plate, causing them to rotate. During rotation, the arc welding gun assembly remains in a fixed position, continuously welding the circumferential seam between the can body and the can head. This welding method ultimately achieves the effect of circumferential pre-limiting of the seam. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0018] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0019] Figure 1 This is a schematic diagram of the overall frontal three-dimensional structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the back of the present invention;

[0021] Figure 3 This is a top view schematic diagram of the overall structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the can body and the canned food of the present invention;

[0023] Figure 5 This is a schematic diagram showing the position and structure of each component on the main positioning base of the present invention;

[0024] Figure 6 This is a schematic diagram of the external three-dimensional structure of the main positioning seat and the auxiliary positioning seat of the present invention;

[0025] Figure 7 This is a partial exploded view of the main positioning seat and the secondary positioning seat of the present invention.

[0026] In the diagram: 1. Base; 2. Supporting guide wheel frame; 3. Gantry transport assembly; 301. Pressure plate; 302. Shifting motor; 4. Tank body; 5. Canned food; 6. Positioning arc groove; 7. Main positioning seat; 700. Welding arc groove; 701. Secondary positioning seat; 8. Positioning rod; 9. Reset arc frame; 10. Reset ring frame; 11. Grinding wheel; 110. Grinding motor; 111. Start switch; 12. Arc welding torch assembly. Detailed Implementation

[0027] 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.

[0028] Example 1, please refer to Figures 1-3 As can be seen, the base 1 provides support and limits for the entire device. During installation, bolts secure it in the desired position. Two gantry transport components 3 are symmetrically arranged on both sides of the base 1. The control computer controls the gantry transport components 3, enabling them to move horizontally back and forth along the base 1. Ultimately, the two gantry transport components 3 can move closer and further apart using program control. Each of the two gantry transport components 3 has a pressure plate 301 mounted movably in the middle using bearings. The gantry transport components 3 drive the two pressure plates 301 closer together, facilitating the clamping of the pressure tank by the two pressure plates 301. Furthermore, a shift motor 302 is fixedly installed on each gantry transport component 3 to drive the rotation of the pressure plate 301. The shift motor 302 drives the corresponding pressure plate 301 to rotate, providing driving force for the subsequent rotation of the clamped pressure tank by the pressure plate 301.

[0029] in accordance with Figure 2 , Figure 6 and Figure 7 It can be seen that the base 1 has a main positioning seat 7 and a secondary positioning seat 701, which are movably mounted using a support shaft seat, and are fastened together with bolts. In practical applications, a robotic arm can insert the can body 4 and can 5 to be welded into the inner sides of the main positioning seat 7 and secondary positioning seat 701, respectively. At this time, the inner walls of the main positioning seat 7 and secondary positioning seat 701 are fitted and connected to the outer sides of the ends of the can body 4 and can 5, and the main positioning seat 7 and secondary positioning seat 701 provide comprehensive positioning for the ends of the can body 4 and can 5, ensuring that the center lines of the can body 4 and can 5 are horizontally aligned. In conjunction with the above, the gantry transport assembly 3 drives the corresponding pressure plate 301 to squeeze and clamp the other end of the can body 4 and can 5, ensuring that the ends of the can body 4 and can 5 to be welded are close together, and the circumferential seam is located inside the main positioning seat 7 and secondary positioning seat 701. Figures 5-7It can be seen that welding arc grooves 700 are provided on the outer bottom of both the main positioning seat 7 and the auxiliary positioning seat 701, so that the circumferential seam between the can body 4 and the can head 5 after alignment can be exposed. At the same time, an arc welding gun assembly 12 is fixedly installed at the bottom of the base 1, passing through the welding arc groove 700 and welding the circumferential seam between the can body 4 and the can head 5. The actual welding structure of the arc welding gun assembly 12 is the same as that of the arc welding currently used, and its specific details will not be elaborated here. As long as the above welding work is met, the invention can be reproduced.

[0030] In practical applications, a robotic arm is used to insert the ends of the can body 4 and the can 5 into the inner sides of the main positioning seat 7 and the auxiliary positioning seat 701, respectively. The control computer manipulates the gantry transport assembly 3, causing the gantry transport assembly 3 to drive the pressure plate 301 to squeeze the can body 4 and the can 5. Finally, the ends of the can body 4 and the can 5 come together, and the circumferential weld is located between the main positioning seat 7 and the auxiliary positioning seat 701.

[0031] The arc welding gun assembly 12 welds the aligned seams. The shifting motor 302 rotates the pressure plate 301, which clamps and secures the can body 4 and can head 5, clockwise. (Direction reference...) Figure 5 The arc welding gun assembly 12 continuously welds the circumferential seam between the tank body 4 and the can head 5 until the circumferential seam is completely welded.

[0032] Finally, combining Figures 1-3 As can be seen, the base 1 has multiple sets of support guide wheel frames 2 bolted to its surface. The rollers on the support guide wheel frames 2 are generally rubber wheels, which support the can body 4 and the can 5. During the welding stage, the support guide wheel frames 2 are used to support the outer sides of the can body 4 and the can 5. After welding is completed, the pressure plate 301 pushes out the welded can body 4 and the can 5 and places them on the support guide wheel frames 2, making it easy for the robot arm to remove them later.

[0033] Example 2 is a further improvement on Example 1. To ensure precise alignment between the ends of the can body 4 and the can head 5, and to ensure accurate alignment between the circumferential seam between the can body 4 and the can head 5 and the welding area of ​​the arc welding gun assembly 12, in conjunction with... Figure 4 It can be seen that the ends of the can body 4 and can head 5 to be welded are provided with bevels. When the ends of the can body 4 and can head 5 are close together, the bevels provide a molten pool, facilitating welding. Simultaneously, both ends of the can body 4 and can head 5 are provided with positioning arc grooves 6, which are semi-circular grooves. When the can body 4 and can head 5 are brought together, the two semi-circular grooves form a complete circular hole. Correspondingly, a positioning rod 8 is movably mounted on the outer side of the main positioning seat 7, and the diameter of the positioning rod 8 is equal to that of the circular hole. From... Figures 5-7As can be seen, a guide rod is threadedly connected to the outer side of the main positioning seat 7. The outer side of the positioning rod 8 is fitted between the guide rod and the outer side of the positioning rod. By utilizing the self-limitation of the outer rod and the positioning rod 8, the positioning rod 8 can only reciprocate along the radial direction of the main positioning seat 7. A spring is provided between the main positioning seat 7 and the positioning rod 8, located on the outer side of the outer side of the outer rod. Driven by the spring, the positioning rod 8 always tends to move towards the center of the main positioning seat 7. Furthermore, the end of the positioning rod 8 that extends into the inner side of the main positioning seat 7 is provided with a frustum, ensuring that after the subsequent weld marks come into contact with the outer inclined surface of the frustum at the end of the positioning rod 8, there is a tendency for the positioning rod 8 to move away from the main positioning seat 7.

[0034] Correspondingly, a reset ring frame 10, which restricts the movement of the positioning rod 8, is fixed to the surface of the base 1 by bolts, and a roller is installed at the end of the positioning rod 8 on one side of the reset ring frame 10. Meanwhile, a reset arc frame 9, which is bolted to the outer part of the reset ring frame 10, gradually increases in distance from the outer arc side of the reset arc frame 9 to the outer part of the reset ring frame 10. Figure 5 As shown, when the positioning rod 8 drives the main positioning seat 7 to rotate clockwise, the roller at the end of the positioning rod 8 will move along the outer arc side of the reset arc frame 9, realizing that the positioning rod 8 moves radially outward along the main positioning seat 7 and compresses the spring; similarly, when the positioning rod 8 moves towards the middle of the main positioning seat 7 due to the spring force, the roller tends to move along the outer arc side of the reset arc frame 9, eventually causing the positioning rod 8 to return to its initial position, that is... Figure 5 The location shown.

[0035] In practical application of this embodiment, under normal circumstances, the positioning rod 8 is inserted between the main positioning seat 7 and the auxiliary positioning seat 701. After the robot arm installs the can body 4 and the can 5 into the inner side of the main positioning seat 7 and the auxiliary positioning seat 701, the positioning arc grooves 6 on the can body 4 and the can 5 are correspondingly pressed against the positioning rod 8. Due to the restriction of the positioning rod 8, the circumferential seam after the ends of the can body 4 and the can 5 are aligned with the welding position of the arc welding gun assembly 12, ensuring that the actual welding part of the arc welding gun assembly 12 is the circumferential seam position, and finally achieving effective end-limiting of the can body 4 and the can 5.

[0036] Secondly, as the gantry transport assembly 3 clamps the can body 4 and the can 5 via the pressure plate 301, it ensures that the ends of the can body 4 and the can 5 are pressed together. Simultaneously, when the shifting motor 302 drives the can 5 to rotate clockwise via the pressure plate 301, the rotation direction is referenced... Figure 5Subsequently, the can body 4 and the can head 5 rotate relative to each other, allowing the arc welding gun assembly 12 to weld the circumferential seam. Initially, because the positioning rod 8 is inserted into the positioning arc groove 6 between the can body 4 and the can head 5, during the rotation of the can body 4 and the can head 5 driven by the pressure plate 301, the positioning rod 8 restricts the synchronous rotation of the can body 4 and the can head 5, causing the main positioning seat 7 and the auxiliary positioning seat 701 to rotate clockwise synchronously. This has the advantage that, in the initial stage of circumferential seam welding by the arc welding gun assembly 12, the positioning rod 8 restricts the synchronous rotation of the can body 4 and the can head 5, ensuring that the arc welding gun assembly 12 can perform a stable weld on the circumferential seam during the initial welding process. This avoids the problem that during the initial welding, the short circumferential weld distance of the arc welding gun assembly 12 prevents the connection between the can head 5 and the can body 4 from being unstable. If friction transmission is based on the compression between the can body 4 and the can head 5 at this time, the thin walls of the can body 4 and the can head 5 may result in insufficient friction. If the can body 4 and the can head 5 are not firmly welded, the insufficient friction or other factors may cause relative movement between the can head 5 and the can body 4, affecting the welding of the circumferential weld between the can body 4 and the can head 5 by the arc welding gun assembly 12.

[0037] As the positioning rod 8 rotates along with the can body 4 and the can head 5, the roller at the end of the positioning rod 8 moves along the outer arc side of the reset arc frame 9, causing the positioning rod 8 to extend radially along the main positioning seat 7 until it disengages from the positioning arc groove 6. Afterward, as the can body 4 and the can head 5 continue to rotate, the positioning rod 8 eventually reaches the circumferential seam between the can body 4 and the can head 5. After reaching the outer arc side of the reset arc frame 9, the positioning rod 8 always tends to move towards the center of the main positioning seat 7. As the welded can body 4 and the can head 5 rotate to the position of the positioning rod 8, because the end of the positioning rod 8 is frustum-shaped, the inclined surface on the end of the positioning rod 8 can cross the weld mark, forcing the end of the positioning rod 8 to always reach the outer side of the circumferential seam between the can body 4 and the can head 5. After the can body 4 and the can head 5 have rotated one revolution, the arc welding gun assembly 12 performs a full weld on the seam between the can body 4 and the can head 5. Since the positioning arc groove 6 is located at the welding site, it will be blocked by welding after passing through the arc welding gun assembly 12. Finally, the arc welding gun assembly 12 is used to complete the welding of the circumferential seam between the can body 4 and the can head 5.

[0038] Finally, after the can body 4 and can 5 are welded, the gantry transport assembly 3 uses the pressure plate 301 to push the can body 4 and can 5 out of the main positioning seat 7 and the auxiliary positioning seat 701, and places the welded can body 4 and can 5 onto the support guide wheel frame 2, making it easier for the robot arm to remove the welded can body 4 and can 5. At the same time, after the can body 4 and can 5 are removed from the main positioning seat 7 and the auxiliary positioning seat 701, the positioning rod 8 tends to move towards the center of the main positioning seat 7 under the push of the spring. The roller at the end of the positioning rod 8 moves along the outer arc side of the reset arc frame 9 to reset, and prepares to limit the next can body 4 and can 5.

[0039] Example 3 is a further improvement on Example 2. Please refer to Example 2. Figures 5-7 It can be seen that a grinding wheel 11 located at the end of the welding arc groove 700 is movably installed between the main positioning seat 7 and the auxiliary positioning seat 701. The grinding wheel 11 is close to the arc welding gun assembly 12, and the outer side of the grinding wheel 11 is tangent to the inner sidewalls of the main positioning seat 7 and the auxiliary positioning seat 701. A grinding motor 110 is fixed on the auxiliary positioning seat 701 by a bracket, and the output shaft of the grinding motor 110 is coaxially and tightly fixed to the grinding wheel 11, so that the grinding motor 110 can drive the grinding wheel 11 to rotate clockwise, with the direction referenced... Figure 5 As shown. For starting the grinding motor 110, from... Figure 5 It can be seen that a start switch 111 is fixedly installed at the end of the reset arc frame 9. The start switch 111 is generally a momentary switch, and the start end of the start switch 111 has a certain pressing stroke to prevent the start switch 111 from blocking the subsequent positioning rod 8 and restricting the rotation of the main positioning seat 7 and the auxiliary positioning seat 701. At the same time, when the start end of the start switch 111 is pressed, it can start the grinding motor 110 and make it rotate.

[0040] In practical applications, the welding process is as described in Example 2. After the arc welding gun assembly 12 welds the circumferential seam of the can body 4 and the can head 5, the weld pool groove constructed with inclined surfaces of the can body 4 and the can head 5 is used to accommodate the weld marks. However, in practical applications, the molten pool is affected by other factors (such as long intervals between stops, excessive metal melting, etc.), resulting in an increase in the amount of metal superposition and the formation of bulges. These bulges not only affect the flatness of the can body's exterior, making it difficult for the can body 4 and the can head 5 to be pulled out from the main positioning seat 7 and the secondary positioning seat 701 due to the presence of bulges; but also, in practical applications, pits or gaps are easily formed at the bulges, providing a retention space for corrosive media (such as water and chemicals), accelerating localized corrosion.

[0041] In practical applications, if no bulge appears at the weld between the can body 4 and the can 5, the grinding motor 110 will not start, and the grinding wheel 11 will rotate along the outer wall of the can body 4 and the can 5. According to the description in Embodiment 2, the positioning rod 8 eventually disengages from the positioning arc groove 6 between the can body 4 and the can 5. When a bulge appears between the can body 4 and the can 5, the bulge, which rotates clockwise with the can body 4 and the can 5, will abut against the grinding wheel 11, thus preventing it from passing over the grinding wheel 11. After the bulge abuts against the grinding wheel 11, it will continue to drive the main positioning seat 7 and the auxiliary positioning seat 701 to rotate clockwise. As the main positioning seat 7 and the auxiliary positioning seat 701 drive the positioning rod 8 to rotate further, the roller on the positioning rod 8 will move further along the outer side of the reset arc frame 9 and compress the spring until the positioning rod 8 abuts against the start end of the start switch 111. When the start switch 111 is activated, the grinding motor 110 will drive the grinding wheel 11 to rotate. The rotation of the grinding wheel 11 will grind the bulge, preventing the bulge from protruding and causing the can body 4 and can 5 to be difficult to remove.

[0042] Finally, after the grinding wheel 11 has finished grinding the bulge, the can body 4 and the can head 5 will no longer obstruct the grinding wheel 11. The positioning rod 8 moves along the outer arc side of the reset arc frame 9 under the push of the spring, thereby driving the positioning rod 8 away from the start switch 111. After the start switch 111 is released from pressure, the grinding motor 110 stops working, and then the circumferential welding work is carried out again according to the above content.

Claims

1. A stainless steel pressure tank circumferential seam welding device, characterized in that, include: The base (1) has a main positioning seat (7) and a secondary positioning seat (701) movably mounted on its surface via a support shaft seat. The main positioning seat (7) and the secondary positioning seat (701) are coaxially fastened together. Welding arc grooves (700) are opened on the bottom outer sides of both the main positioning seat (7) and the secondary positioning seat (701). An arc welding gun assembly (12) passing through the welding arc groove (700) is fixedly installed at the bottom of the base (1). The gantry transport assembly (3) has a pressure plate (301) driven by a transposition motor (302) mounted on its surface. After the robotic arm inserts the can body (4) and the can (5) into the inside of the main positioning seat (7) and the auxiliary positioning seat (701) respectively, the gantry transport assembly (3) uses the pressure plate (301) to squeeze the ends of the can body (4) and the can (5) to achieve coaxial fitting and limiting of the can body (4) and the can (5) with the main positioning seat (7) and the auxiliary positioning seat (701); When the shift motor (302) drives the tank body (4) and the can head (5) to rotate according to the pressure plate (301), the arc welding gun assembly (12) performs welding on the circumferential seam between the tank body (4) and the can head (5); The ends of the can body (4) and the can (5) are provided with positioning arc grooves (6). The positioning arc grooves (6) are semi-circular grooves. A positioning rod (8) is movably installed on the outer side of the main positioning seat (7), and a spring is provided between the main positioning seat (7) and the positioning rod (8). After the positioning arc groove (6) at the end of the can body (4) and the can head (5) abuts against the positioning rod (8), the circumferential seam at the end of the can body (4) and the can head (5) aligns with the arc welding gun assembly (12).

2. The apparatus for welding a girth weld of a stainless steel pressure vessel of claim 1 wherein, The base (1) has a support guide wheel frame (2) mounted on its surface.

3. The stainless steel pressure tank circumferential welder according to claim 1, characterized in that, The ends of the can body (4) and can head (5) to be welded are provided with bevels. When the ends of the can body (4) and can head (5) are close together, a molten pool is formed between the bevels.

4. The stainless steel pressure tank circumferential welder according to claim 1, characterized in that, A reset ring frame (10) is fixed on the surface of the base (1), and a reset arc frame (9) is fastened to the outer side of the reset ring frame (10). A roller is installed at the end of the positioning rod (8). When the positioning rod (8) drives the main positioning seat (7) to rotate, the roller at the end of the positioning rod (8) moves along the outer arc side of the reset arc frame (9), so that the positioning rod (8) moves radially outward along the main positioning seat (7).

5. The stainless steel pressure tank circumferential welder according to claim 4, characterized in that, A grinding wheel (11) located at the end of the welding arc groove (700) is movably installed between the main positioning seat (7) and the auxiliary positioning seat (701). A grinding motor (110) that drives the grinding wheel (11) is fixedly installed on the auxiliary positioning seat (701).

6. The stainless steel pressure tank circumferential welder according to claim 5, characterized in that, A start switch (111) is fixedly installed at the end of the reset arc frame (9). When the start switch (111) is pressed, the grinding motor (110) is started.

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