Pressure vessel inner girth welding device and inner girth welding method

Abstract

The present invention discloses a pressure vessel inner girth welding device and an inner girth welding method, and relates to the technical field of welding inner girths of pressure vessels. The pressure vessel inner girth welding device comprises a fixing table, wherein the fixing table is provided with two left and right groups for preliminarily fixing the pressure vessel shell; an annular clamping unit, wherein the annular clamping unit comprises an outer clamping component and an inner clamping component, wherein the outer clamping component and the inner clamping component can apply opposite clamping forces along the radial direction thereof to the shell from the inner and outer sides respectively. By setting a connection structure, the welding unit can drive the annular clamping unit to move synchronously in the process of entering the shell and aligning the weld, thereby realizing efficient coordination of clamping and welding operations. The annular clamping unit applies clamping forces approaching each other along the radial direction thereof synchronously from the inner and outer sides of the shell through the outer clamping component and the inner clamping component, thereby realizing bidirectional stable clamping of the shell end.

Description

Technical Field

[0001] The present invention relates to the technical field of welding inner girth seams of pressure vessels, in particular to a device and a method for welding inner girth seams of pressure vessels. Background Art

[0002] A pressure vessel is a sealed device capable of withstanding internal or external pressure. It is widely used in the chemical, petroleum, energy, pharmaceutical, and food processing industries, primarily for storing or transporting high-pressure gases and liquids and conducting chemical reactions. Its structure typically consists of multiple components, of which the inner annular seam, the internal annular seam connecting the two cylindrical shells, is a critical pressure-bearing component of the vessel. Because pressure vessels must operate safely under high pressure, welding is a core process to ensure their overall sealing, strength, and durability. Welding securely connects the separate shells to prevent the risk of leakage or rupture.

[0003] However, there are still the following problems in the process of welding the inner annular seam of the pressure vessel:

[0004] (1) The shell is usually fixed by external circumferential clamping, that is, the 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 constraints and lacks an effective axial limit structure. As a result, the shell is prone to axial displacement or tilt due to vibration, welding thermal stress or external disturbance during the clamping or welding process. This will directly affect the fitting accuracy between the end faces to be welded, resulting in uneven butt gaps, misalignment, and other problems, thereby reducing the quality of the weld formation and even causing welding defects. The welding operation efficiency needs to be improved;

[0005] (2) Due to the long shell, it is difficult for the operator to accurately judge the actual moving position of the welding gun through external observation during the welding process, and thus it is impossible to effectively confirm whether the welding gun has accurately reached the predetermined welding area. This visual blind spot can easily lead to positioning deviation of the welding starting point, thereby affecting the quality of weld formation and reducing the consistency and process reliability of the welding operation. At the same time, the method of welding the welding gun deep into the shell has the problem of insufficient structural stability. When the length of the robot arm is extended too long, its end is prone to slight vibration or offset due to the decrease in rigidity, resulting in unstable welding gun trajectory, affecting the path accuracy and welding quality during the welding process. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention provides a pressure vessel inner girth welding device and an inner girth welding method, which solve the problems raised in the background art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: the pressure vessel inner annular seam welding device includes a fixing table, which is provided with two left and right groups for preliminarily fixing the pressure vessel shell; an annular clamping unit, which includes an outer clamping assembly and an inner clamping assembly, and the outer clamping assembly and the inner clamping assembly can respectively apply opposite clamping forces to the shell from the inner and outer sides along the radial direction thereof; the outer clamping assembly and the inner clamping assembly both include an arc-shaped pressure plate, which is evenly distributed along the circumference of the shell, and a wedge block 1 is installed on the side of the arc-shaped pressure plate facing away from the shell, and a wedge block 2 is slidably connected to the inclined surface of the wedge block 1, and a connecting structure is provided between the left and right opposing wedge blocks 2, and the connecting structure is used to control the synchronous relative movement of the left and right opposing wedge blocks 2; a welding unit, which is connected to the inner clamping assembly, and when the welding unit enters the interior of the shell and aligns with the weld, it can drive the annular clamping unit to move synchronously; a positioning plate, which is used to align and position the shell weld position.

[0008] Furthermore, the connecting structure includes a moving block installed on the side of wedge block 2 away from wedge block 1, and two moving blocks opposite to each other are threadedly installed on the same bidirectional screw, and the bidirectional screw is rotatably installed between the left and right annular frames, and a guide rod is installed between the left and right annular frames, which is located on the outside of the bidirectional screw and is slidably connected to the moving block; after the left end of the bidirectional screw rotates through the annular frame, bevel gear 1 is installed, bevel gear 1 is meshed with bevel gear 2, and a rotating gear is installed on bevel gear 2, and 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 rotatably cooperates with the bidirectional screw.

[0009] Furthermore, the connection structure also includes a wedge block three installed on the wedge block two, a wedge block four is slidably installed on the wedge block three, a mounting frame is connected between the wedge blocks four, the mounting frame is installed on the pushing frame, and the left and right opposite wedge blocks one are slidably installed on the same guide groove plate through sliding columns, and annular frames are provided on the left and right sides of the pushing frame, and elastic telescopic rods fixedly connected to the annular frames are installed at the ends of the guide groove plates; the positioning plate is installed between the left and right annular frames.

[0010] Furthermore, an arc-shaped clamping plate is provided on one side of the arc-shaped pressure plate close to the shell, an adjustment column is installed on the arc-shaped clamping plate and is slidably connected to the arc-shaped pressure plate, and an adjustment spring is sleeved on the adjustment column and is located between the arc-shaped pressure plate and the arc-shaped clamping plate.

[0011] Furthermore, both sides of the arc-shaped pressure plate along the circumferential direction thereof are hinged with side rods through torsion spring shafts, and the ends of the side rods are rotatably mounted with rotating wheels through rotating shafts.

[0012] Furthermore, a spring telescopic column is installed on the annular frame, and a rotating column is rotatably installed on the telescopic end of the spring telescopic column.

[0013] Furthermore, the welding unit includes a rotating ring sleeved on the outside of the inner clamping assembly, the welding gun is arranged on the outside of the rotating ring, an inner gear ring is installed on the inside of the rotating ring, a driving gear is engaged on the inner gear ring, the driving gear is connected to the output shaft of the driving motor, and the driving motor is installed on the corresponding annular frame.

[0014] Furthermore, annular grooves are provided on both the left and right sides of the rotating ring, and an arc-shaped bar slidably connected to the annular groove is installed on the side of the annular frame close to the rotating ring.

[0015] Furthermore, a support column is installed on the left side of the annular frame located on the left side, and the pushing frame slides with the support column, and a push rod is installed on the left side of the pushing frame. A triangular frame is connected between the support columns in the outer clamping assembly and the inner clamping assembly, and a sliding sleeve is slidably installed at the end of the support column, and a sliding spring is provided inside the sliding sleeve. The push rod is fixedly connected to the sliding sleeve, and the sliding sleeve is provided on the same movable plate, and the movable plate is installed on the welding box, and the welding box can actively move left and right; a working frame is provided between the left and right groups of fixed tables, and a baffle is installed on the inside of the working frame, and a positioning groove that cooperates with the positioning plate is provided on the baffle.

[0016] The present invention also provides a pressure vessel inner girth seam welding method, which is applicable to a pressure vessel inner girth seam welding device, and comprises the following steps:

[0017] Step 1: Place the pressure vessel shells to be welded on the corresponding fixing tables respectively, and adjust them so that the areas to be welded are aligned with each other, and then pre-fix the shells using the existing device set on the fixing table;

[0018] Step 2: The welding box drives the annular clamping unit and the welding unit to move synchronously toward the housing. The inner clamping assembly and the outer clamping assembly are located on the inner and outer sides of the housing, respectively, and the welding unit moves synchronously to the inside of the housing.

[0019] Step 3: When the welding unit is aligned with the weld seam, the outer clamping assembly and the inner clamping assembly can apply clamping forces in radial directions to the shell from both the inner and outer sides respectively.

[0020] Step 4: The welding gun in the welding unit can perform rotational welding along the circumferential trajectory of the inner ring weld of the shell to complete the welding of the inner ring weld.

[0021] The present invention has the following beneficial effects:

[0022] (1) The pressure vessel inner annular seam welding device is provided with a connection structure so that the welding unit can drive the annular clamping unit to move synchronously when entering the shell and aligning the weld, thereby realizing efficient coordination of clamping and welding operations and significantly improving the overall work efficiency of the equipment. The annular clamping unit applies clamping forces that approach each other along the radial direction from the inner and outer sides of the shell through the outer clamping component and the inner clamping component, thereby realizing bidirectional stable clamping of the shell end. By forming opposite clamping forces, this structure further improves the clamping rigidity and positioning accuracy, preventing the shell from being offset or tilted due to vibration or other external factors during the welding process. At the same time, the bidirectional clamping method helps to improve the fit between the end faces to be welded, enhance the quality of the weld butt, and thus improve the welding quality and efficiency.

[0023] (2) The internal annular seam welding device of the pressure vessel can ensure the accurate positioning and position locking of the annular clamping unit and the welding unit during the overall movement process by limiting the moving position of the external clamping assembly, thereby providing a stable and reliable position reference for subsequent clamping and welding operations. At the same time, the overall position of the annular clamping unit and the welding unit is accurately limited by external positioning, which effectively solves the visual blind spot problem caused by the long length of the shell and avoids the clamping or welding deviation caused by inconvenient observation or indirect positioning in the traditional positioning method, thereby ensuring the stability of the clamping process and the welding accuracy.

[0024] (3) The annular clamping unit of the pressure vessel internal annular seam welding device has good adaptability and can stably clamp shells of different diameters. By setting side rods and rollers, the overall stability of the clamping assembly can be increased, and the restraining ability of the clamping assembly on the shell can be improved, thereby further improving the clamping reliability and structural strength of the annular clamping unit. By setting spring telescopic columns and rotating columns, the overall stability of the guiding performance of the annular clamping unit during dynamic movement is improved, effectively avoiding the common defects of the robot arm in long-stroke movement or dynamic operation, such as shaking, inaccurate positioning and unstable clamping force.

[0025] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 Schematic diagram of part of the structure of the present invention Figure 1 (dissected and cut open);

[0028] Figure 3 Schematic diagram of part of the structure of the present invention Figure 2 (Section view);

[0029] Figure 4 This is a schematic structural diagram of the outer clamping assembly in Example 1 of the present invention;

[0030] Figure 5 This is a partial structural diagram of the connection structure in Example 1 of the present invention;

[0031] Figure 6 For the present invention Figure 4 Schematic diagram of the structure of the middle arc pressure plate and the arc splint;

[0032] Figure 7 For the present invention Figure 6 A magnified schematic diagram of area A in the middle;

[0033] Figure 8 Schematic diagram of part of the structure of the present invention Figure 3 (dissected and cut open);

[0034] Figure 9 Schematic diagram of the structure of the inner clamping assembly in the present invention;

[0035] Figure 10 It is a partial structural diagram of the welding unit and the inner clamping assembly in the present invention;

[0036] Figure 11 Schematic diagram of the structure of the arc-shaped pressure plate and the arc-shaped clamping plate in the inner clamping assembly of the present invention;

[0037] Figure 12 Schematic diagram of part of the structure of the present invention Figure 4 (dissected and cut open);

[0038] Figure 13 This is a partial structural diagram of the outer clamping assembly in the second embodiment of the present invention;

[0039] Figure 14 This is a partial structural diagram of the connection structure in Example 2 of the present invention.

[0040] In the figure, 1, fixed platform; 2, housing; 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, pushing frame; 332, positioning plate; 333, spring telescopic column; 334, rotating column; 335, rotating ring; 336, annular groove; 337, arc bar; 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

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Refer to the following Figure 1 - Figure 14 , describing the pressure vessel inner girth welding device and inner girth welding method provided by the embodiments of the present invention.

[0044] In one aspect, the present invention provides a device for welding an internal girth seam of a pressure vessel.

[0045] Example 1:

[0046] See also Figure 1-Figure 3The pressure vessel inner girth welding device includes a fixed platform 1, which is provided with two left and right groups. Before welding, the two pressure vessel shells 2 to be welded can be distributed and placed on the upper end support surfaces of the left and right fixed platforms 1, and adjusted to align the welds between the adjacent ends. The existing clamping device provided on the fixed platform 1 can clamp and fix the shell 2 from the outer circumference direction. This type of existing clamping device mainly includes components such as a clamping arm, a clamping block and a driving mechanism. The driving mechanism is generally a cylinder or a hydraulic cylinder, and its output end is connected to the clamping arm, so that the clamping block moves closer to the shell 2 and applies a clamping force, thereby achieving preliminary positioning and stable support of the shell 2, providing good assembly accuracy and operation basis for the subsequent welding of the inner girth weld between the shells 2.

[0047] In addition, an annular clamping unit 3 is also provided, which includes an outer clamping component 31 and an inner clamping component 32. During the clamping process, the outer clamping component 31 and the inner clamping component 32 can simultaneously apply a clamping force approaching each other along their radial direction from the inner and outer sides of the shell 2, thereby realizing bidirectional stable clamping of the end of the shell 2. This structure further improves the clamping rigidity and positioning accuracy by forming opposite clamping forces, preventing the shell 2 from shifting or tilting due to vibration or other external factors during the welding process. At the same time, the bidirectional clamping method helps to improve the fit between the end faces to be welded, enhance the quality of the weld butt, and thus improve the welding quality and efficiency.

[0048] See also Figure 3-Figure 7 and Figures 9-11The outer clamping assembly 31 and the inner clamping assembly 32 have the same structure. Both the outer clamping assembly 31 and the inner clamping assembly 32 include an arc-shaped pressure plate 311, which is evenly distributed along the circumference of the shell 2. The inner surface contour of the arc-shaped pressure plate 311 in the outer clamping assembly 31 and the outer surface contour of the arc-shaped pressure plate 311 in the inner clamping assembly 32 are respectively adapted to the outer wall and inner wall of the shell 2, so as to ensure that the shell 2 is subjected to a uniform clamping force. A wedge block 312 is installed on the side of the arc-shaped pressure plate 311 facing away from the shell 2. The inclined surfaces of the two wedge blocks 312 opposite to each other are opposite to each other. An inclined groove 313 is provided on the inclined surface of the 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 locking of the shell 2 after the locking is completed. When the left and right wedge blocks 316 move toward each other, their inclined surfaces approaching each other will slide relative to each other along the inclined groove 313 on the wedge block 1 312 through the slider 314, and compress the reset spring 315. In this process, the wedge block 1 312 is subjected to the force from the inclined surface of the wedge block 2 316, and the force is decomposed into two components in the directions perpendicular and parallel to its own inclined surface. As a result, the left and right wedge blocks 1 312 can move toward each other while simultaneously moving, and finally achieve stable clamping of the housing 2 through the arc-shaped pressure plate 311.

[0049] See also Figure 4-Figure 6 and Figure 11 In order to enable the annular clamping unit 3 to adapt to shells 2 of different diameters and achieve stable clamping, an arc clamping plate 317 is provided on the side of the arc pressure plate 311 close to the shell 2, and a rubber pad is provided on the side of the arc clamping plate 317 close to the shell 2. The rubber pad can enhance the friction between the arc clamping plate 317 and the outer wall of the shell 2 to prevent sliding or offset during the clamping process, thereby improving the clamping stability. At the same time, an adjustment column 318 is installed on the arc clamping plate 317, which is slidably connected to the arc pressure plate 311. The adjustment column An adjustment spring 319 is sleeved on 318 and is located between the arc pressure plate 311 and the arc clamping plate 317. When the arc pressure plate 311 moves toward the shell 2, the adjustment column 318 drives the arc clamping plate 317 to move forward synchronously, and after contacting the shell 2, the adjustment spring 319 is compressed along the adjustment column 318, so that the adjustment spring 319 applies continuous clamping pressure to the arc clamping plate 317. Under the action of the spring force, the arc clamping plate 317 can automatically fit the surface of the shell 2 with different diameters, realize adaptive clamping, and ensure the reliability of clamping.

[0050] See also Figure 5 、 Figure 6 and Figure 11The side rods 320 are hinged on both sides of the arc pressure plate 311 along its circumferential direction through the torsion spring shaft. Under the action of the torsion spring shaft, the side rods 320 always have a tendency to tilt toward the direction of the arc pressure plate 311. When the arc pressure plate 311 approaches the shell 2, the side rods 320 first contact the outer wall of the shell 2 and rotate outward around the torsion spring shaft under the pressure of the shell 2 surface, thereby realizing the function of automatically avoiding and fitting shells 2 of different diameters. A rotating wheel 321 is installed at the end of the side rod 320 through a rotating shaft. The rotating wheel 321 is in rolling contact with the surface of the shell 2. The rotating wheel 321 can be used to move the shell 2 in a direction of rotation and can prevent the shell 2 from axially shifting during the clamping or welding process. In addition, the matching structure of the side rod 320 and the rotating wheel 321 can also enhance the overall stability of the arc-shaped clamping plate 317 during the clamping process, improve the restraint ability of the clamping assembly on the shell 2, and further improve the clamping reliability and structural stability of the annular clamping unit 3.

[0051] See also Figure 4-Figure 6 、 Figure 10 and Figure 11 When the two-way screw 323 rotates, the moving blocks 322 on the left and right sides will move synchronously toward each other along the guide rod 325 under the threaded transmission action of the two-way screw 323, thereby driving the wedge block 316 connected thereto to move synchronously.

[0052] See also Figure 4 、 Figure 5 、 Figure 8 、 Figure 9 and Figure 12, in order to drive the bidirectional screw 323 to rotate, a bevel gear 1 326 is installed after the left end of the bidirectional screw 323 rotates and passes through the annular frame 324, and a bevel gear 2 327 is meshed with the bevel gear 1 326, and a rotating gear 328 is installed on the bevel gear 2 327. The bevel gear 1 326, the bevel gear 2 327 and the rotating gear 328 are rotatably mounted on the same support frame 329, and the support frame 329 is fixedly connected to the annular frame 324. A rack 330 is meshed with one side of the rotating gear 328, and the rack 330 is mounted 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 stationary. At this time, the pushing frame 331 continues to move to the right ( Figure 2 From the perspective of the present invention, the rack 330 is driven to move right synchronously. Since the bevel gear 1 326, the bevel gear 2 327 and the rotating gear 328 are in a stationary state at this time, the rack 330 will drive the rotating gear 328 meshing with it to rotate around its axis, thereby converting the linear motion into rotational motion. The rotating gear 328 drives the bevel gear 2 327 fixed coaxially therewith to rotate synchronously. Because the bevel gear 2 327 and the bevel gear 1 326 are meshed with each other and the two are arranged with a perpendicular axis, the rotation of the bevel gear 2 327 will drive the bevel gear 1 326 to rotate around its axis through the meshing transmission. Finally, the bevel gear 1 326 can drive the bidirectional screw 323 connected thereto to rotate synchronously.

[0053] See also Figure 2-Figure 5 In order to ensure that the annular clamping unit 3 can accurately move to the position of the weld seam and enable the arc-shaped pressure plates 311 in the outer clamping assembly 31 and the inner clamping assembly 32 to apply opposite clamping forces to the shell 2 symmetrically with the weld seam as the center, a positioning plate 332 that rotates with the bidirectional screw 323 is installed on the guide rod 325. At the same time, a working frame 4 is set between the left and right sets of fixed platforms 1. A baffle 41 is installed on the inner side of the working frame 4. A positioning groove that cooperates with the positioning plate 332 is opened on the baffle 41. When the annular clamping unit 3 moves to the predetermined welding position along the guide path, the positioning plate 332 Then it enters and abuts against the positioning groove. Since the positioning groove limits the positioning plate 332, it cannot move forward any further, thereby ensuring that the annular clamping unit 3 stops at the correct position and remains stationary, achieving accurate positioning and position locking of the entire moving process, and 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 shell 2, the visual blind spot problem caused by the large length of the shell 2 is effectively solved, and the clamping deviation caused by inaccurate positioning is avoided, thereby ensuring the stability of the clamping process and the welding accuracy.

[0054] See also Figure 4-Figure 6 、 Figure 9 and Figure 10In order to further improve the structural stability of the annular clamping unit 3 during the axial movement along the shell 2, a spring telescopic column 333 is further installed on the annular frame 324. The spring telescopic column 333 is used to provide elastic support force to the annular frame 324, so that it can stably fit the outer wall or inner wall of the shell 2 for sliding and guiding movement. A rotating column 334 is rotatably installed on the telescopic end of the spring telescopic column 333. The rotating column 334 is in rolling contact with the surface of the shell 2, thereby significantly reducing the friction resistance between the spring telescopic column 333 and the shell 2, effectively improving the guiding performance and overall structural stability of the annular clamping unit 3 during dynamic movement.

[0055] See also Figure 9 and Figure 10 , is also provided with a welding unit, which is connected to the inner clamping assembly 32 and can operate independently without interfering with the normal clamping action of the inner clamping assembly 32. At the same time, the welding unit can move as a whole to the inside of the shell 2 with the annular clamping unit 3, and can synchronously align the inner ring weld. The welding unit includes a rotating ring 335 that is sleeved on the outside of the inner clamping assembly 32. Annular grooves 336 are provided on the left and right sides of the rotating ring 335. An arcuate bar 337 that is slidably connected to the annular groove 336 is installed on the side of the annular frame 324 close to the rotating ring 335. A sliding guide structure is formed between the arcuate bar 337 and the annular groove 336. The annular frame 324 provides stable support and guidance for the rotational movement of the rotating ring 335 with the help of the sliding cooperation between the arcuate bar 337 and the annular groove 336, thereby ensuring stability during the welding process.

[0056] In addition, the welding gun 338 is arranged on the outside of the rotating ring 335 and is used to perform welding operations on the inner ring weld between the shells 2. An inner gear ring 339 is installed on the inner side of the rotating ring 335, and a drive gear 340 is engaged on the inner gear ring 339. The drive gear 340 is connected to the output shaft of the drive motor 341, and the drive motor 341 is installed on the corresponding annular frame 324. When the welding unit moves to the preset welding position with the annular clamping unit 3, the welding gun 338 is precisely aligned with the position of the inner ring weld to be welded. At this time, the drive motor 341 is started to drive the drive gear 340 to rotate. The drive gear 340 is driven by the engagement with the inner gear ring 339 to make the rotating ring 335 rotate synchronously, thereby driving the welding gun 338 installed on the outside to perform circumferential rotation around the axis of the shell 2. The welding gun 338 can perform continuous rotation welding along the circumferential trajectory of the inner ring weld, thereby achieving uniform and stable welding of the weld area.

[0057] See also Figure 1-Figure 5 、 Figure 8 、 Figure 9 and Figure 12 In order to enable the welding unit to drive the annular clamping unit 3 to move synchronously when entering the shell 2 and aligning the weld, a support column 342 is installed on the left side of the annular frame 324 ( Figure 2 From the perspective of the embodiment of the present invention, a triangular frame 343 is connected between the support column 342 in the outer clamping component 31 and the inner clamping component 32. The triangular frame 343 can ensure that the support column 342 in the outer clamping component 31 and the support column 342 in the inner clamping component 32 remain synchronized during movement, thereby realizing the coordinated movement of the outer clamping component 31 and the inner clamping component 32 along the axial direction of the shell 2, improving the consistency and stability of the clamping and welding actions, and at the same time, the pushing frame 331 slides with the support column 342, and a push rod 344 is installed on the left side of the pushing frame 331, and a sliding sleeve 345 is slidably installed at the end of the support column 342, and a sliding spring 346 is arranged inside the sliding sleeve 345. It should be noted that the sliding spring 346 has a large elastic coefficient to provide sufficient thrust.

[0058] When the cam 330 is in the unlock state, the locking cam 331 is unlocked and the locking cam 332 is unlocked, and the cam 332 is unlocked.

[0059] In addition, the sliding sleeve 345 is installed on the same movable plate 347, the movable plate 347 is installed on the welding box 5, the welding box 5 is set on the existing sliding device, and can drive the movable plate 347 and the components thereon to move left and right along the axial direction of the shell 2. The movable plate 347 drives the annular clamping unit 3 and the welding unit as a whole to move synchronously through the connection between the sliding sleeve 345 and the support column 342.

[0060] Example 2:

[0061] See also Figure 13 and Figure 14The 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, and the inclined surfaces of the wedge blocks three 348 on the left and right sides are oriented in 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 achieve relative movement through inclined surface sliding cooperation, and a mounting bracket 350 is connected between the wedge blocks four 349. When the mounting bracket 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 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 pressure plates 311 on the left and right sides. It should be noted that the figure only shows part of the outer clamping component 31 and the connection structure located in the outer clamping component 31. The inner clamping component 32 and the connection structure in the outer clamping component 31 are completely consistent in terms of structural composition, assembly method and movement principle.

[0062] When the annular clamping unit 3 is moved to the appropriate position, the positioning plate 332 can cooperate with the positioning groove on the baffle 41 to achieve the same positioning effect as mentioned above, thereby completing the precise positioning of the position of the annular clamping unit 3. The mounting frame 350 is installed on the pushing frame 331, and the left and right opposite wedge blocks 312 are slidably installed on the same guide groove plate 352 through a sliding column, so that the wedge block 312 can move smoothly along the axial direction of the shell 2 under the guidance of the guide groove plate 352. The guide groove plate 352 supports and guides the movement trajectory of the wedge block 312 through the sliding column, ensuring its stable and reliable movement. Annular frames 324 are provided on the left and right 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 to cooperate with the movement of the wedge block 312.

[0063] When the locking cam 330 is unlocked, the locking cam 330 is unlocked and the winch 330 is unlocked, and the winch 330 is unlocked, so that the winch 330 can be unlocked.

[0064] On the other hand, the present invention also provides a pressure vessel inner girth welding method, which is applicable to a pressure vessel inner girth welding device, combined with Figure 1-Figure 3 and Figure 10 , including the following steps:

[0065] Step 1: Place the pressure vessel shells 2 to be welded on the corresponding fixing platforms 1 respectively, and adjust them so that the areas to be welded are aligned with each other, and then pre-fix the shells 2 using the existing clamping device provided on the fixing platform 1;

[0066] Step 2: The welding box 5 drives the annular clamping unit 3 and the welding unit to move synchronously toward the housing 2. The inner clamping assembly 32 and the outer clamping assembly 31 are located on the inner and outer sides of the housing 2, respectively, and the welding unit moves synchronously to the inside of the housing 2.

[0067] Step 3: When the welding unit is aligned with the weld seam, the outer clamping assembly 31 and the inner clamping assembly 32 can apply clamping forces in radial directions to the housing 2 from both the inner and outer sides.

[0068] Step 4: The welding gun 338 in the welding unit can perform rotational welding along the circumferential trajectory of the inner annular weld of the shell 2 to complete the welding of the inner annular weld.

Claims

1. Pressure vessel inner girth welding device, characterized in that: include: A fixing platform (1), wherein the fixing platform (1) is provided with two left and right groups for preliminarily fixing the pressure vessel shell (2); An annular clamping unit (3), the annular clamping unit (3) comprising an outer clamping component (31) and an inner clamping component (32), the outer clamping component (31) and the inner clamping component (32) being capable of applying opposite clamping forces along the radial direction of the housing (2) from both the inner and outer sides thereof; The outer clamping assembly (31) and the inner clamping assembly (32) both include an arc-shaped pressure plate (311), the arc-shaped pressure plates (311) are evenly distributed along the circumference of the shell (2), a wedge block 1 (312) is installed on the side of the arc-shaped pressure plate (311) away from the shell (2), a wedge block 2 (316) is slidably connected to the inclined surface of the wedge block 1 (312), and a connecting structure is provided between the left and right opposite wedge blocks 2 (316), and the connecting structure is used to control the left and right opposite wedge blocks 2 (316) to move synchronously toward each other; A welding unit, the welding unit being connected to the inner clamping assembly (32), and capable of driving the annular clamping unit (3) to move synchronously when the welding unit enters the interior of the shell (2) and aligns with the weld seam; A positioning plate (332), the positioning plate (332) being used to align and position the weld position of the shell (2); The connection structure includes a moving block (322) installed on a side of the wedge-shaped block 2 (316) away from the wedge-shaped block 1 (312), the two moving blocks (322) opposite to each other 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) is installed between the left and right annular frames (324) and is located outside the bidirectional screw (323) and is slidably connected to the moving block (322); The left end of the bidirectional screw (323) rotates through the annular frame (324) and is then installed with a bevel gear 1 (326), the bevel gear 1 (326) is meshed with a bevel gear 2 (327), the bevel gear 2 (327) is installed with a rotating gear (328), one side of the rotating gear (328) is meshed with a rack (330), and the rack (330) is installed on the pushing frame (331); The positioning plate (332) is mounted on the guide rod (325) and is rotationally engaged with the bidirectional screw (323); The welding unit includes a rotating ring (335) sleeved on the outside of the inner clamping assembly (32), a welding gun (338) is arranged on the outside of the rotating ring (335), an inner gear ring (339) is installed on the inside of the rotating ring (335), a driving gear (340) is meshed on the inner gear ring (339), and the driving gear (340) is connected to the output shaft of the driving motor (341), and the driving motor (341) is installed on the corresponding annular frame (324); 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 grooves (336) is installed on one side of the annular frame (324) close to the rotating ring (335); A support column (342) is installed on the left side of the annular frame (324) located on the left side, the push frame (331) and the support column (342) are slidably matched, a push rod (344) is installed on the left side of the push frame (331), a triangular frame (343) is connected between the support column (342) in 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 provided inside the sliding sleeve (345), the push rod (344) and the sliding sleeve (345) are fixedly connected, the sliding sleeve (345) is provided on the same movable plate (347), the movable plate (347) is installed on the welding box (5), and the welding box (5) can actively move left and right; A working frame (4) is provided between the two groups of fixed platforms (1) on the left and right sides. A baffle (41) is installed on the inner side of the working frame (4). A positioning groove is provided on the baffle (41) to match the positioning plate (332).

2. The pressure vessel inner girth welding device according to claim 1, characterized in that: The connection structure includes a wedge block three (348) mounted on a wedge block two (316), a wedge block four (349) slidably mounted on the wedge block three (348), a mounting frame (350) connected between the wedge blocks four (349), the mounting frame (350) being mounted on the push frame (331), the wedge blocks one (312) on the left and right sides being slidably mounted on the same guide slot plate (352) via a slide column, an annular frame (324) being provided on both the left and right sides of the push frame (331), and an elastic telescopic rod (351) fixedly connected to the annular frame (324) being mounted on the end of the guide slot plate (352); The positioning plate (332) is installed between the left and right annular frames (324).

3. The pressure vessel inner girth welding device according to claim 1 or 2, characterized in that: An arc-shaped clamping plate (317) is provided on one side of the arc-shaped pressure plate (311) close to the housing (2). An adjustment column (318) slidably connected to the arc-shaped pressure plate (311) is mounted on the arc-shaped clamping plate (317). An adjustment spring (319) is sleeved on the adjustment column (318) and is located between the arc-shaped pressure plate (311) and the arc-shaped clamping plate (317).

4. The pressure vessel inner girth welding device according to claim 3, characterized in that: The arc-shaped pressure plate (311) is hingedly connected to side rods (320) on both sides along its circumferential direction via torsion spring shafts, and a rotating wheel (321) is rotatably mounted on the end of the side rod (320) via a rotating shaft.

5. The pressure vessel inner girth welding device according to claim 1 or 2, characterized in that: A spring telescopic column (333) is mounted on the annular frame (324), and a rotating column (334) is rotatably mounted on the telescopic end of the spring telescopic column (333).

6. A pressure vessel inner girth seam welding method, applicable to the pressure vessel inner girth seam welding device according to claim 1, characterized in that: The following steps are involved: Step 1: placing the pressure vessel shells (2) to be welded on the corresponding fixing tables (1) respectively, and adjusting them so that the areas to be welded are aligned with each other, and then pre-fixing the shells (2) by the fixing tables (1); Step 2: The annular clamping unit (3) and the welding unit are driven by the welding box (5) to move synchronously toward the direction of the shell (2), 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 is synchronously moved to the inside of the shell (2); Step 3: During the process of aligning the welding unit with the weld seam, the outer clamping assembly (31) and the inner clamping assembly (32) can apply clamping forces in radial directions to the shell (2) from both the inner and outer sides thereof; Step 4: The welding gun (338) in the welding unit can perform rotational welding along the circumferential trajectory of the inner annular weld of the shell (2) to complete the welding of the inner annular weld.

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