Inner girth welding device and inner girth welding method for pressure container

Abstract

The invention discloses a pressure vessel inner circular seam welding device and an inner circular seam welding method, and relates to the technical field of pressure vessel inner circular seam welding. The pressure vessel inner girth welding device comprises a left fixing table and a right fixing table which are used for preliminarily fixing a pressure vessel shell. And the annular clamping unit comprises an outer clamping assembly and an inner clamping assembly, and the outer clamping assembly and the inner clamping assembly can apply opposite clamping force in the radial direction to the shell from the inner side and the outer side of the shell correspondingly. By arranging the connecting structure, the welding unit can drive the annular clamping unit to synchronously act in the process of entering the shell and aligning to a welding seam, so that efficient cooperation of clamping and welding operation is realized; the annular clamping unit synchronously applies clamping force which is close to each other in the radial direction of the shell from the inner side and the outer side of the shell through the outer clamping assembly and the inner clamping assembly, and therefore bidirectional stable clamping of the end of the shell is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding of internal circumferential seams of pressure vessels, and specifically to an internal circumferential seam welding device and an internal circumferential seam welding method for pressure vessels. Background Art

[0002] A pressure vessel is a closed device that can withstand internal or external pressure, and is widely used in fields such as chemical industry, petroleum, energy, pharmaceuticals, and food processing, mainly for storing or transporting high-pressure gases and liquids and carrying out chemical reactions, etc. Its structure usually consists of multiple components, and the internal circumferential seam refers to the internal annular joint connecting two cylindrical shells, which is a key part for the container to bear pressure. Since the pressure vessel needs to operate safely under high-pressure conditions, welding is the core process to ensure its overall sealing performance, strength, and durability. By welding, the separated shells are firmly connected to prevent the risk of leakage or rupture.

[0003] However, there are still the following problems in the process of welding the internal circumferential seams of pressure vessels at present: (1) Commonly, an external circumferential clamping method is used to fix the shell, that is, a clamping force is applied along the outer circumference of the shell to achieve its positioning and support. However, this type of clamping method only provides circumferential restraint and lacks an effective axial limiting structure, resulting in the shell being prone to axial displacement or tilting during clamping or welding due to vibration, welding thermal stress, or external disturbances, which will directly affect the fitting accuracy between the end faces to be welded, causing problems such as uneven butt gaps and misalignment, thereby reducing the weld forming quality and even causing welding defects, and the welding operation efficiency needs to be improved; (2) Due to the long length of the shell, it is difficult for the operator to accurately judge the actual movement position of the welding torch through external observation during the welding process, so it is impossible to effectively confirm whether the welding torch has accurately reached the predetermined welding area. This visual blind area is likely to cause deviation in the positioning of the welding starting point, thereby affecting the weld forming quality and reducing the consistency and process reliability of the welding operation. At the same time, the method of the welding torch extending into the interior of the shell for welding has the problem of insufficient structural stability. When the extending length of the robotic arm is too long, its end is prone to micro-vibration or deviation due to the decrease in rigidity, resulting in unstable running trajectory of the welding torch and affecting the path accuracy and welding quality during welding. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides an internal circumferential seam welding device and an internal circumferential seam welding method for pressure vessels, which solve the problems raised in the background art.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: The inner circumferential seam welding device for a pressure vessel includes a fixed table, and there are two groups of left and right fixed tables for preliminarily fixing the pressure vessel shell; an annular clamping unit, which includes an outer clamping assembly and an inner clamping assembly. The outer clamping assembly and the inner clamping assembly can respectively apply an opposite clamping force in the radial direction of the shell from the inside and outside of the shell; both the outer clamping assembly and the inner clamping assembly include arc-shaped pressing plates, and the arc-shaped pressing plates are evenly distributed along the circumferential direction of the shell. On the side of the arc-shaped pressing plate facing away from the shell, a first wedge block is installed. A second wedge block is slidably connected to the inclined surface of the first wedge block. A connecting structure is arranged between the left and right opposite second wedge blocks, and the connecting structure is used to control the synchronous opposite movement of the left and right opposite second wedge blocks; a welding unit, which is connected to the inner clamping assembly. When the welding unit enters the inside of the shell and aligns with the weld seam, it can drive the annular clamping unit to act synchronously; a positioning plate, which is used to align and position the weld seam position of the shell.

[0006] Further, the connecting structure includes a moving block installed on the side of the second wedge block away from the first wedge block. The two left and right opposite moving blocks are threadedly installed on the same bidirectional screw. The bidirectional screw is rotatably installed between the left and right annular frames. Between the left and right annular frames, a guide rod located outside the bidirectional screw and slidably connected to the moving block is installed; the left end of the bidirectional screw rotatably penetrates through the annular frame and then a first bevel gear is installed. A second bevel gear is meshed with the first bevel gear. A rotating gear is installed on the second bevel gear. A rack is meshed with one side of the rotating gear, and the rack is installed on the pushing frame; the positioning plate is installed on the guide rod and is rotationally matched with the bidirectional screw.

[0007] Further, the connecting structure also includes a third wedge block installed on the second wedge block. A fourth wedge block is slidably installed on the third wedge block. An installation frame is connected between the fourth wedge blocks, and the installation frame is installed on the pushing frame. The left and right opposite first wedge blocks are slidably installed on the same guide groove plate through sliding columns. Annular frames are arranged on both sides of the pushing frame. The end of the guide groove plate is installed with an elastic telescopic rod fixedly connected to the annular frame; the positioning plate is installed between the left and right annular frames.

[0008] Further, an arc-shaped clamping plate is arranged on the side of the arc-shaped pressing plate close to the shell. An adjusting column slidably connected to the arc-shaped pressing plate is installed on the arc-shaped clamping plate, and an adjusting spring located between the arc-shaped pressing plate and the arc-shaped clamping plate is sleeved on the adjusting column.

[0009] Further, on both sides of the arc-shaped pressing plate along its circumferential direction, side rods are hinged through torsion spring shafts, and rotating wheels are rotatably installed at the ends of the side rods through rotating shafts.

[0010] Further, a spring telescopic column is installed on the annular frame, and a rotating column is rotatably installed at the telescopic end of the spring telescopic column.

[0011] Furthermore, the welding unit includes a rotating ring sleeved outside the inner clamping assembly. The welding torch is arranged outside the rotating ring. An internal gear ring is installed inside the rotating ring. A driving gear is meshed with the internal gear ring. The driving gear is connected to the output shaft of a driving motor, and the driving motor is installed on the corresponding annular frame.

[0012] Furthermore, annular grooves are formed on both the left and right sides of the rotating ring. An arc-shaped strip slidably connected to the annular groove is installed on one side of the annular frame close to the rotating ring.

[0013] Furthermore, a support column is installed on the left side of the annular frame located on the left. The pushing frame is slidably matched with the support column. A push rod is installed on the left side of the pushing frame. A triangular frame is connected between the support columns of the outer clamping assembly and the inner clamping assembly. A sliding sleeve is slidably installed at the end of the support column. A sliding spring is arranged inside the sliding sleeve. The push rod is fixedly connected to the sliding sleeve. The sliding sleeves are arranged on the same moving plate. The moving plate is installed on the welding box, and the welding box can move actively left and right; A working frame is arranged between the left and right groups of fixed platforms. A baffle is installed inside the working frame. A positioning groove matched with the positioning plate is formed on the baffle.

[0014] The present invention also provides a method for welding the inner circumferential seam of a pressure vessel, which is applicable to a device for welding the inner circumferential seam of a pressure vessel, and includes the following steps: Step 1: Place the pressure vessel shells to be welded on the corresponding fixed platforms respectively, and adjust them so that the welding areas to be welded are aligned with each other. Subsequently, pre-fix the shells through the existing devices arranged on the fixed platforms; Step 2: Drive the annular clamping unit and the welding unit as a whole to move synchronously towards the direction where the shell is located through the welding box. The inner clamping assembly and the outer clamping assembly are respectively located on the inner and outer sides of the shell, and the welding unit moves synchronously into the shell; Step 3: During the process of the welding unit aligning with the weld seam, the outer clamping assembly and the inner clamping assembly can respectively apply an opposite clamping force in the radial direction to the shell from its inner and outer sides; Step 4: The welding torch in the welding unit can rotate and weld along the circumferential track of the inner circumferential weld of the shell to complete the welding of the inner circumferential seam.

[0015] The present invention has the following beneficial effects: (1)The inner circumferential seam welding device of this pressure vessel, by setting up a connection structure, enables the welding unit to drive the annular clamping unit to act synchronously during the process of entering the inside of the shell and aligning with the weld seam, thus realizing the efficient coordination of clamping and welding operations, significantly improving the overall working efficiency of the equipment. The annular clamping unit applies clamping forces that approach each other radially from the inside and outside of the shell through the outer clamping component and the inner clamping component, thereby achieving two-way stable clamping of the end of the shell. This structure further improves the clamping rigidity and positioning accuracy by forming opposing clamping forces, preventing the shell from shifting or tilting due to vibration or other external factors during welding. At the same time, the two-way clamping method helps to improve the fit degree between the end faces to be welded, enhance the butt quality of the weld seam, and thus improve the welding quality and efficiency.

[0016] (2)The inner circumferential seam welding device of this pressure vessel, by limiting and controlling the moving position of the outer clamping component, can ensure the accurate positioning and position locking of the annular clamping unit and the welding unit during the overall movement, thus providing a stable and reliable position reference for subsequent clamping and welding operations. At the same time, by precisely defining the overall position of the annular clamping unit and the welding unit through external positioning, it effectively solves the problem of visual blind spots caused by the large length of the shell, and avoids the clamping or welding deviation caused by inconvenient observation or indirect positioning in the traditional positioning method, thus ensuring the stability of the clamping process and the welding accuracy.

[0017] (3)The inner circumferential seam welding device of this pressure vessel, the annular clamping unit has good adaptability and can stably clamp shells of different diameter specifications. By setting up side rods and rollers, the overall stability of the clamping component can be increased, and the constraint ability of the clamping component on the shell can be improved, thereby further enhancing the clamping reliability and structural strength of the annular clamping unit. By setting up spring telescopic columns and rotating columns, the overall stability of the guiding performance of the annular clamping unit during dynamic movement can be improved, effectively avoiding common defects such as jitter, inaccurate positioning, and unstable clamping force during the long-stroke movement or dynamic operation of the robotic arm.

[0018] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the partial structural schematic Figure 1 (sectioned); Figure 3 is the partial structural schematic Figure 2 (section view); Figure 4 is the structural schematic diagram of the outer clamping component in Embodiment 1 of the present invention; Figure 5 It is a partial structural schematic diagram of the connection structure in the first embodiment of the present invention; Figure 6 For the present invention Figure 4 A schematic diagram of the structure of the middle arc-shaped pressure plate and the arc-shaped clamping plate; Figure 7 For the present invention Figure 6 A magnified schematic diagram of the middle A area; Figure 8 It is a schematic diagram of the partial structure of the present invention Figure 3 (dissected and cut open); Figure 9 It is a schematic diagram of the structure of the inner clamping assembly in the present invention; Figure 10 It is a partial structural schematic diagram of the welding unit and the inner clamping assembly in the present invention; Figure 11 It is a schematic structural diagram of the arc-shaped pressing plate and the arc-shaped clamping plate in the inner clamping assembly of the present invention; Figure 12 It is a partial structural diagram of the present invention. Figure 4 (dissected and cut open); Figure 13 It is a partial structural schematic diagram of the outer clamping assembly in the second embodiment of the present invention; Figure 14 It is a partial structural diagram of the connection structure in the second embodiment of the present invention.

[0020] In the figure, 1, fixed platform; 2, shell; 3, annular clamping unit; 31, outer clamping assembly; 311, arc pressure plate; 312, wedge block 1; 313, inclined groove; 314, slider; 315, return spring; 316, wedge block 2; 317, arc clamping plate; 318, adjustment column; 319, adjustment spring; 32, inner clamping assembly; 320, side rod; 321, rotating wheel; 322, moving block; 323, bidirectional screw; 324, annular frame; 325, guide rod; 326, bevel gear 1; 327, bevel gear 2; 328, rotating gear; 329, support frame; 330, Rack; 331, push frame; 332, positioning plate; 333, spring telescopic column; 334, rotating column; 335, rotating ring; 336, annular groove; 337, arc strip; 338, welding gun; 339, inner gear ring; 340, driving gear; 341, driving motor; 342, supporting column; 343, triangular frame; 344, push rod; 345, sliding sleeve; 346, sliding spring; 347, moving plate; 348, wedge block three; 349, wedge block four; 350, mounting frame; 351, elastic telescopic rod; 352, guide groove plate; 4, working frame; 41, baffle; 5, welding box. DETAILED DESCRIPTION

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientation or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0023] Next, refer to Figure 1 - Figure 14 to describe the inner circumferential weld welding device and the inner circumferential weld welding method for pressure vessels provided by the embodiments of the present invention.

[0024] On the one hand, the present invention provides an inner circumferential weld welding device for pressure vessels.

[0025] Embodiment 1: Please refer to Figures 1 - 3 , this inner circumferential weld welding device for pressure vessels includes a fixed table 1, and there are two groups of left and right fixed tables 1. Before welding, the two pressure vessel shells 2 to be welded can be respectively placed on the upper support surfaces of the left and right fixed tables 1, and adjusted so that the welds between their adjacent ends are aligned. The existing clamping devices provided on the fixed table 1 can clamp and fix the shells 2 from the outer circumferential direction of the shells 2. Such existing clamping devices mainly include components such as clamping arms, clamping blocks, and driving mechanisms. The driving mechanism is generally a cylinder or a hydraulic cylinder, and its output end is connected to the clamping arm to make the clamping block approach the shell 2 and apply a clamping force, thereby realizing the preliminary positioning and stable support of the shell 2, providing good assembly accuracy and operation basis for the welding of the inner circumferential weld between the subsequent shells 2.

[0026] In addition, a ring clamping unit 3 is also provided. The ring clamping unit 3 includes an outer clamping assembly 31 and an inner clamping assembly 32. During the clamping process, the outer clamping assembly 31 and the inner clamping assembly 32 can synchronously apply a clamping force approaching each other in the radial direction from the inside and outside of the shell 2, thereby realizing the two-way stable clamping of the end of the shell 2. This structure further improves the clamping rigidity and positioning accuracy by forming an opposing clamping force, preventing the shell 2 from shifting or tilting due to vibration or other external factors during the welding process. At the same time, the two-way clamping method helps to improve the fitting degree between the end faces to be welded, enhance the butt quality of the weld, and thus improve the welding quality and efficiency.

[0027] Please refer toFigures 3 - 7 and Figures 9 - 11 , wherein the outer clamping assembly 31 and the inner clamping assembly 32 have the same structure. The outer clamping assembly 31 and the inner clamping assembly 32 both include arc-shaped pressing plates 311, and the arc-shaped pressing plates 311 are evenly distributed along the circumferential direction of the housing 2. The inner surface contour of the arc-shaped pressing plate 311 in the outer clamping assembly 31 and the outer surface contour of the arc-shaped pressing plate 311 in the inner clamping assembly 32 are respectively adapted to the outer wall and the inner wall of the housing 2, so as to ensure that the housing 2 is subjected to a uniform clamping force. A first wedge block 312 is installed on the side of the arc-shaped pressing plate 311 facing away from the housing 2. The inclined surfaces of the two first wedge blocks 312 opposite to each other are facing away. An inclined groove 313 is formed on the inclined surface of the first wedge block 312. A slider 314 is slidably installed in the inclined groove 313. A return spring 315 is connected between the slider 314 and the groove wall of the inclined groove 313, which is used to realize the automatic reset of the slider 314 after the clamping is completed. A second wedge block 316 is arranged on the inclined surface of the first wedge block 312. The slider 314 is fixedly connected to the inclined surface of the second wedge block 316. The inclined surfaces of the two second wedge blocks 316 opposite to each other are facing each other. When the two second wedge blocks 316 move towards each other, their approaching inclined surfaces will generate relative sliding along the inclined groove 313 on the first wedge block 312 through the slider 314 and compress the return spring 315. During this process, the first wedge block 312 receives the acting force from the inclined surface of the second wedge block 316 and decomposes this force into two component forces perpendicular and parallel to its own inclined surface. Thus, the two first wedge blocks 312 opposite to each other can approach the housing 2 synchronously while moving towards each other, and finally realize the stable clamping of the housing 2 through the arc-shaped pressing plate 311.

[0028] Please refer to Figures 4 - 6 and Figure 11 , in order to enable the annular clamping unit 3 to adapt to the housing 2 with different diameter specifications and realize stable clamping, an arc-shaped clamping plate 317 is further arranged on the side of the arc-shaped pressing plate 311 close to the housing 2. A rubber pad is arranged on the side of the arc-shaped clamping plate 317 close to the housing 2. The friction between the arc-shaped clamping plate 317 and the outer wall of the housing 2 can be enhanced through this rubber pad, preventing sliding or deviation during the clamping process, thereby improving the clamping stability. At the same time, an adjusting column 318 slidably connected to the arc-shaped pressing plate 311 is installed on the arc-shaped clamping plate 317. An adjusting spring 319 located between the arc-shaped pressing plate 311 and the arc-shaped clamping plate 317 is sleeved on the adjusting column 318. When the arc-shaped pressing plate 311 moves towards the housing 2, the adjusting column 318 drives the arc-shaped clamping plate 317 to move forward synchronously, and after contacting the housing 2, the adjusting spring 319 is compressed along the adjusting column 318, so that the adjusting spring 319 applies a continuous clamping pressure to the arc-shaped clamping plate 317. The arc-shaped clamping plate 317 can automatically fit the surface of the housing 2 with different diameters under the action of the spring force, realizing adaptive clamping and ensuring the reliability of the clamping.

[0029] Please refer to Figure 5 ,Figure 6 and Figure 11 , on both sides of the arc-shaped pressing plate 311 along its circumferential direction, side rods 320 are hinged through torsion spring shafts. Under the action of the torsion spring shafts, the side rods 320 always have a tendency to tilt towards the direction where the arc-shaped pressing plate 311 is located. When the arc-shaped pressing plate 311 approaches the housing 2, the side rods 320 first come into contact with the outer wall of the housing 2 and rotate outward around the torsion spring shafts under the pressing action on the surface of the housing 2, realizing the functions of automatic avoidance and fitting of different-diameter housings 2. A runner 321 is rotatably installed at the end of the side rod 320 through a rotating shaft. The runner 321 is in rolling contact with the surface of the housing 2, thus significantly reducing the frictional resistance and improving the smoothness of the clamping action. Since the axis of rotation of the runner 321 around the rotating shaft is parallel to the axis of the housing 2, during the rolling process, the runner 321 not only plays a guiding role but also further prevents the housing 2 from axially shifting during clamping or welding. In addition, the matching structure of the side rod 320 and the runner 321 can also enhance the overall stability during the clamping process of the arc-shaped clamping plate 317 and improve the constraint ability of the clamping assembly on the housing 2, thereby further enhancing the clamping reliability and structural stability of the annular clamping unit 3.

[0030] Please refer to Figures 4 - 6 、 Figure 10 and Figure 11 , in order to control the synchronous opposite movement of the left and right relative wedge blocks two 316, a connection structure is provided between the left and right relative wedge blocks two 316. The connection structure includes a moving block 322. The moving block 322 is installed on the side of the wedge block two 316 away from the wedge block one 312. The two left and right relative moving blocks 322 are threadedly installed on the same bidirectional screw 323, and the bidirectional screw 323 is provided with two threads with opposite helix directions, which are respectively connected to the moving blocks 322 on the left and right sides. The bidirectional screw 323 is rotatably installed between the left and right two annular frames 324. A guide rod 325 which is located outside the bidirectional screw 323 and is slidably connected to the moving block 322 is also installed between the left and right annular frames 324, for guiding and limiting the movement direction of the moving block 322 to ensure its stable linear movement. When the bidirectional screw 323 rotates, the left and right moving blocks 322 will move synchronously and oppositely along the guide rod 325 under the thread transmission action of the bidirectional screw 323, thereby driving the wedge blocks two 316 connected to them to act synchronously.

[0031] Please refer to Figure 4 、 Figure 5 、 Figure 8 、 Figure 9 and Figure 12, To drive the rotation of the bidirectional screw 323, a first bevel gear 326 is installed at the left end of the bidirectional screw 323 after passing through the annular frame 324 in a rotating manner. A second bevel gear 327 is engaged with the first bevel gear 326, and a rotating gear 328 is installed on the second bevel gear 327. The first bevel gear 326, the second bevel gear 327, and the rotating gear 328 are rotatably installed on the same support frame 329. The support frame 329 is fixedly connected to the annular frame 324. A rack 330 is engaged with one side of the rotating gear 328, and the rack 330 is installed on the pushing frame 331. When the annular clamping unit 3 moves to a suitable clamping position, the outer clamping assembly 31 and the inner clamping assembly 32 remain in a static state. At this time, the pushing frame 331 continues to move to the right ( Figure 2 viewpoint), driving the rack 330 to move synchronously to the right. Since the first bevel gear 326, the second bevel gear 327, and the rotating gear 328 are in a static state at this time, the rack 330 will drive the rotating gear 328 engaged with it to rotate around its axis, thus converting linear motion into rotational motion. The rotating gear 328 drives the second bevel gear 327 fixedly connected to its coaxial to rotate synchronously. Because the second bevel gear 327 is engaged with the first bevel gear 326 and the two are arranged with perpendicular axes, the rotation of the second bevel gear 327 will drive the first bevel gear 326 to rotate around its axis through meshing transmission. Finally, the first bevel gear 326 can drive the bidirectional screw 323 connected to it to rotate synchronously.

[0032] Please refer to Figures 2 - 5 , To ensure that the annular clamping unit 3 can accurately move to the position where the weld is located, and enable the arc-shaped pressing plates 311 in the outer clamping assembly 31 and the inner clamping assembly 32 to apply a clamping force towards the housing 2 symmetrically with the weld as the center, a positioning plate 332 that rotates in cooperation with the bidirectional screw 323 is also installed on the guide rod 325. At the same time, a working frame 4 is also provided between the left and right fixed platforms 1. A baffle 41 is installed inside the working frame 4, and a positioning groove that cooperates with the positioning plate 332 is opened on the baffle 41. When the annular clamping unit 3 moves along the guiding path to the predetermined welding position, the positioning plate 332 then enters and abuts against the positioning groove. Since the positioning groove limits the positioning plate 332 and makes it unable to continue moving forward, it ensures that the annular clamping unit 3 stops and remains in a static state at the correct position, realizing accurate positioning and position locking of the overall moving process, providing a reliable position reference for subsequent clamping and welding operations. By limiting the overall position of the annular clamping unit 3 from the outside of the housing 2, the problem of visual blind spots caused by the large length of the housing 2 is effectively solved, and the clamping deviation caused by inaccurate positioning is avoided, thus ensuring the stability of the clamping process and the welding accuracy.

[0033] Please refer to Figures 4 - 6 , Figure 9 and Figure 10, to further improve the structural stability of the annular clamping unit 3 during its axial movement along the housing 2, a spring telescopic column 333 is also installed on the annular frame 324. The spring telescopic column 333 is used to provide an elastic supporting force to the annular frame 324, enabling it to stably fit against the outer wall or inner wall of the housing 2 for sliding guiding movement. A rotating column 334 is rotatably installed on the telescopic end of the spring telescopic column 333, and the rotating column 334 is in rolling contact with the surface of the housing 2, thereby significantly reducing the frictional resistance between the spring telescopic column 333 and the housing 2 and effectively improving the guiding performance and overall structural stability of the annular clamping unit 3 during dynamic movement.

[0034] Please refer to Figure 9 and Figure 10 , a welding unit is also provided. The welding unit is connected to the inner clamping component 32 and can operate independently without interfering with the normal clamping operation of the inner clamping component 32. At the same time, the welding unit can move as a whole with the annular clamping unit 3 into the interior of the housing 2 and can synchronously align with the inner ring weld. The welding unit includes a rotating ring 335 sleeved outside the inner clamping component 32. Annular grooves 336 are provided on both the left and right sides of the rotating ring 335. An arc-shaped strip 337 slidably connected to the annular groove 336 is installed on one side of the annular frame 324 close to the rotating ring 335. A sliding guiding structure is formed between the arc-shaped strip 337 and the annular groove 336. The annular frame 324 provides stable support and guidance for the rotational movement of the rotating ring 335 by means of the sliding fit between the arc-shaped strip 337 and the annular groove 336, ensuring the stability during the welding process.

[0035] Moreover, a welding torch 338 is arranged outside the rotating ring 335 for welding the inner ring weld between the housings 2. An internal gear ring 339 is installed inside the rotating ring 335. A driving gear 340 is engaged with the internal gear ring 339. The driving gear 340 is connected to the output shaft of a driving motor 341, and the driving motor 341 is installed on the corresponding annular frame 324. When the welding unit moves with the annular clamping unit 3 to the preset welding position, the welding torch 338 is accurately aligned with the position of the inner ring weld to be welded. At this time, the driving motor 341 is started to drive the driving gear 340 to rotate. The driving gear 340 drives the rotating ring 335 to rotate synchronously through meshing transmission with the internal gear ring 339, and then drives the welding torch 338 installed outside it to perform a circumferential rotational movement around the axis of the housing 2. The welding torch 338 can perform continuous rotational welding along the circumferential trajectory of the inner ring weld, thereby achieving uniform and stable welding of the weld area.

[0036] Please refer to Figures 1 - 5 , Figure 8 , Figure 9 and Figure 12 , to enable the welding unit to drive the annular clamping unit 3 to move synchronously during the process of entering the interior of the housing 2 and aligning with the weld, a support column 342 is also installed on the left side of the annular frame 324 on the left side (Figure 2 From this perspective, a triangular frame 343 is connected between the support columns 342 in the outer clamping assembly 31 and the inner clamping assembly 32. The triangular frame 343 can ensure that the support columns 342 in the outer clamping assembly 31 and the support columns 342 in the inner clamping assembly 32 move synchronously during the movement, so as to realize the coordinated movement of the outer clamping assembly 31 and the inner clamping assembly 32 along the axial direction of the housing 2, improve the consistency and stability of the clamping and welding actions. At the same time, the pushing frame 331 is slidably matched with the support column 342. A push rod 344 is installed on the left side of the pushing frame 331. A sliding sleeve 345 is slidably installed at the end of the support column 342. A sliding spring 346 is arranged inside the sliding sleeve 345. It should be noted that the sliding spring 346 has a relatively large elastic coefficient to provide sufficient thrust.

[0037] In the initial state, the sliding sleeve 345 can push the support column 342 and the annular frame 324 connected thereto to move to the right under the elastic action of the sliding spring 346. The pushing frame 331 moves synchronously with the sliding sleeve 345 through the push rod 344. When the annular clamping unit 3 is in a fixed state due to the cooperation between the positioning plate 332 and the positioning groove, the sliding sleeve 345 can compress the sliding spring 346 during the continuous rightward movement and slide smoothly to the right along the support column 342. The pushing frame 331 and the push rod 344 move synchronously therewith. During this process, the pushing frame 331 drives the rack 330 connected thereto to gradually approach and engage with the corresponding rotating gear 328, thereby driving the rotating gear 328 to rotate, and then triggering the actions of the subsequent clamping assemblies to realize the automatic loading of the clamping force.

[0038] In addition, the sliding sleeve 345 is installed on the same moving plate 347. The moving plate 347 is installed on the welding box 5. The welding box 5 is arranged on the existing sliding device and can drive the moving plate 347 and the components thereon to move left and right along the axis direction of the housing 2. The moving plate 347 drives the annular clamping unit 3 and the welding unit to move synchronously as a whole through the connection and cooperation between the sliding sleeve 345 and the support column 342.

[0039] Embodiment 2: Please refer to Figure 13 and Figure 14, the difference between this embodiment and the first embodiment is that the connection structure in this embodiment includes a wedge block three 348 installed on the wedge block two 316. The inclined surfaces of the wedge blocks three 348 on the left and right sides face the same direction, and a wedge block four 349 is slidably installed on its inclined surface. The wedge block three 348 and the wedge block four 349 are in relative movement through sliding cooperation on the inclined surface. An installation frame 350 is connected between the wedge blocks four 349. When the installation frame 350 drives the wedge blocks four 349 on the left and right sides to move synchronously, the inclined surface of the wedge block four 349 will slide along the inclined surface of the wedge block three 348. The inclined surface cooperation between the wedge block four 349 and the wedge block three 348 can be effectively converted into a horizontal thrust, thereby driving the wedge block two 316 and the wedge block one 312 connected thereto to move synchronously, and finally realizing the coordinated clamping action of the arc-shaped pressing plates 311 on the left and right sides. It should be noted that only part of the outer clamping assembly 31 and the connection structure located in the outer clamping assembly 31 are shown in the figure. The connection structures in the inner clamping assembly 32 and the outer clamping assembly 31 are completely the same in terms of structural composition, assembly method, and movement principle.

[0040] In addition, a positioning plate 332 is installed between the left and right annular frames 324. When the annular clamping unit 3 moves to a suitable position, the positioning plate 332 can cooperate with the positioning groove on the baffle 41 to achieve the same positioning effect as described above, and complete the precise positioning of the position of the annular clamping unit 3. The installation frame 350 is installed on the pushing frame 331. The left and right opposite wedge blocks one 312 are slidably installed on the same guiding groove plate 352 through sliding columns, so that the wedge block one 312 can move smoothly along the axial direction of the housing 2 under the guidance of the guiding groove plate 352. The guiding groove plate 352 plays a supporting and guiding role for the movement track of the wedge block one 312 through the sliding columns, ensuring the stability and reliability of its movement. Both sides of the pushing frame 331 are provided with annular frames 324. An elastic telescopic rod 351 fixedly connected to the annular frame 324 is installed at the end of the guiding groove plate 352 for cooperating with the movement of the wedge block one 312.

[0041] In the process of the aforementioned moving plate 347 driving the sliding sleeve 345, the sliding spring 346 and the support column 342 to move as a whole, similarly, when the annular frame 324 is locked and fixed due to the cooperation of the positioning plate 332 and the positioning groove, the wedge block one 312 remains in its initial position under the limiting action of the guiding groove plate 352 and the supporting action of the elastic telescopic rod 351, and is in a relatively stable state. At this time, the push rod 344 continues to push the pushing frame 331, and the installation frame 350 moves synchronously with the pushing frame 331. The wedge block four 349 in the connection structure starts to act, driving the wedge blocks one 312 on the left and right sides to slide towards each other along the guiding groove plate 352, and the elastic telescopic rod 351 elongates synchronously. Finally, the wedge block one 312 drives the arc-shaped pressing plate 311 to approach the housing 2, realizing the stable clamping of the housing 2 and completing the clamping action of the clamping assembly.

[0042] On the other hand, the present invention also provides an inner circumferential weld welding method for a pressure vessel, which is applicable to an inner circumferential weld welding device for a pressure vessel. Combining Figures 1 - 3 and Figure 10 , it includes the following steps: Step 1: Place the pressure vessel shells 2 to be welded on the corresponding fixing tables 1 respectively, and adjust them so that the welding areas to be welded are aligned with each other. Subsequently, pre-fix the shells 2 through the existing clamping devices arranged on the fixing tables 1; Step 2: Drive the annular clamping unit 3 and the welding unit as a whole to move synchronously towards the direction where the shell 2 is located through the welding box 5. The inner clamping assembly 32 and the outer clamping assembly 31 are respectively located on the inner and outer sides of the shell 2, and the welding unit moves synchronously into the shell 2; Step 3: During the process of the welding unit aligning with the weld seam, the outer clamping assembly 31 and the inner clamping assembly 32 can respectively apply an opposing clamping force in the radial direction to the shell 2 from the inner and outer sides thereof; Step 4: The welding torch 338 in the welding unit can rotate and weld along the circumferential track of the inner circumferential weld of the shell 2 to complete the welding of the inner circumferential weld.

Claims

1. Inner circumferential seam welding device for pressure vessel, characterized in that, Comprising: Fixed platforms (1), with two groups of left and right fixed platforms (1) provided for initially fixing the pressure vessel shell (2); An annular clamping unit (3), the annular clamping unit (3) includes an outer clamping assembly (31) and an inner clamping assembly (32), and the outer clamping assembly (31) and the inner clamping assembly (32) can respectively apply an opposite clamping force in the radial direction of the shell (2) from the inside and outside of the shell (2); Both the outer clamping assembly (31) and the inner clamping assembly (32) include arc-shaped pressing plates (311), the arc-shaped pressing plates (311) are evenly distributed along the circumferential direction of the shell (2), a first wedge-shaped block (312) is installed on the side of the arc-shaped pressing plate (311) facing away from the shell (2), a second wedge-shaped block (316) is slidably connected to the inclined surface of the first wedge-shaped block (312), and a connecting structure is provided between the left and right opposite second wedge-shaped blocks (316), and the connecting structure is used to control the synchronous opposite movement of the left and right opposite second wedge-shaped blocks (316); A welding unit, the welding unit is connected to the inner clamping assembly (32), and when the welding unit enters the inside of the shell (2) and aligns with the weld seam, it can drive the annular clamping unit (3) to act synchronously; A positioning plate (332), the positioning plate (332) is used to align and position the weld seam position of the shell (2).

2. The inner circumferential seam welding device for a pressure vessel according to claim 1, characterized in that: The connecting structure includes a moving block (322) installed on the side of the second wedge-shaped block (316) away from the first wedge-shaped block (312), and the left and right opposite moving blocks (322) are threadedly installed on the same bidirectional screw (323), the bidirectional screw (323) is rotatably installed between the left and right annular frames (324), and a guide rod (325) located outside the bidirectional screw (323) and slidably connected to the moving block (322) is installed between the left and right annular frames (324); The left end of the bidirectional screw (323) rotatably penetrates through the annular frame (324) and then installs a first bevel gear (326), a second bevel gear (327) is engaged with the first bevel gear (326), a rotating gear (328) is installed on the second bevel gear (327), and a rack (330) is engaged with one side of the rotating gear (328), and the rack (330) is installed on the pushing frame (331); The positioning plate (332) is installed on the guide rod (325) and is rotationally matched with the bidirectional screw (323).

3. The inner circumferential seam welding device for a pressure vessel according to claim 1, characterized in that: The connecting structure includes a third wedge-shaped block (348) installed on the second wedge-shaped block (316), a fourth wedge-shaped block (349) is slidably installed on the third wedge-shaped block (348), an installation frame (350) is connected between the fourth wedge-shaped blocks (349), the installation frame (350) is installed on the pushing frame (331), and the left and right opposite first wedge-shaped blocks (312) are slidably installed on the same guide groove plate (352) through sliding columns, annular frames (324) are provided on both sides of the pushing frame (331), and an elastic telescopic rod (351) fixedly connected to the annular frame (324) is installed at the end of the guide groove plate (352); The positioning plate (332) is installed between the left and right annular frames (324).

4. The inner circumferential weld welding device for pressure vessels according to claim 2 or 3, characterized in that: On one side of the arc-shaped pressing plate (311) close to the housing (2), there is an arc-shaped clamping plate (317). An adjusting column (318) slidably connected to the arc-shaped pressing plate (311) is installed on the arc-shaped clamping plate (317). An adjusting spring (319) located between the arc-shaped pressing plate (311) and the arc-shaped clamping plate (317) is sleeved on the adjusting column (318).

5. The inner circumferential weld device for pressure vessels according to claim 4, characterized in that: On both sides of the arc-shaped pressing plate (311) along its circumferential direction, side rods (320) are hinged through torsion spring shafts. A runner (321) is rotatably installed at the end of the side rod (320) through a rotating shaft.

6. The inner circumferential seam welding device for a pressure vessel according to claim 2 or 3, characterized in that: A spring telescopic column (333) is installed on the annular frame (324). A rotating column (334) is rotatably installed at the telescopic end of the spring telescopic column (333).

7. The inner circumferential weld device for pressure vessels according to claim 2 or 3, characterized in that: The welding unit includes a rotating ring (335) sleeved outside the inner clamping assembly (32). A welding torch (338) is arranged outside the rotating ring (335). An internal gear ring (339) is installed inside the rotating ring (335). A driving gear (340) is meshed with the internal gear ring (339). The driving gear (340) is connected to the output shaft of a driving motor (341). The driving motor (341) is installed on the corresponding annular frame (324).

8. The inner circumferential seam welding device for a pressure vessel according to claim 7, characterized in that: Annular grooves (336) are formed on both the left and right sides of the rotating ring (335). Arc-shaped strips (337) slidably connected to the annular grooves (336) are installed on one side of the annular frame (324) close to the rotating ring (335).

9. The inner circumferential weld device for a pressure vessel according to claim 8, characterized in that: A support column (342) is installed on the left side of the annular frame (324) on the left. A pushing frame (331) is slidably matched with the support column (342). A push rod (344) is installed on the left side of the pushing frame (331). A triangular frame (343) is connected between the support columns (342) of the outer clamping assembly (31) and the inner clamping assembly (32). A sliding sleeve (345) is slidably installed at the end of the support column (342). A sliding spring (346) is arranged inside the sliding sleeve (345). The push rod (344) is fixedly connected to the sliding sleeve (345). The sliding sleeve (345) is arranged on the same moving plate (347). The moving plate (347) is installed on the welding box (5). The welding box (5) can move actively left and right; A working frame (4) is arranged between the left and right two groups of fixed platforms (1). A baffle (41) is installed inside the working frame (4). A positioning groove matched with the positioning plate (332) is formed on the baffle (41).

10. A method for welding the inner circumferential seam of a pressure vessel, applicable to the inner circumferential seam welding device of the pressure vessel described in claim 9, characterized in that, Including the following steps: Step 1: Place the pressure vessel housing (2) to be welded on the corresponding fixed platform (1) respectively, and adjust to align their welding areas. Then, pre-fix the housing (2) through the fixed platform (1); Step 2: Drive the annular clamping unit (3) and the welding unit as a whole to move synchronously towards the direction where the housing (2) is located through the welding box (5). The inner clamping assembly (32) and the outer clamping assembly (31) are respectively located on the inner and outer sides of the housing (2), and the welding unit moves synchronously into the housing (2); Step 3: During the process of the welding unit aligning with the weld seam, the outer clamping assembly (31) and the inner clamping assembly (32) can respectively apply an opposing clamping force in the radial direction of the housing (2) from the inside and outside of the housing (2). Step 4: The welding torch (338) in the welding unit can rotate and weld along the circumferential trajectory of the inner ring weld seam of the housing (2) to complete the welding of the inner ring weld.

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