Automatic argon arc welding device and method for metal expansion joint production

Abstract

The invention discloses an automatic argon arc welding device and method for metal expansion joint production, and relates to the technical field of welding, the automatic argon arc welding device comprises a supporting seat used for supporting a metal expansion joint and a sliding assembly which is arranged on one side of the supporting seat and can move in the vertical direction, and a welding gun is arranged at the tail end of the sliding assembly; and the welding gun can swing to change the angle towards the metal expansion joint. The supporting base is arranged in a split mode and comprises a fixing part and an adjusting part, the rotating shaft is fixed to the inner side of the fixing part and extends into the adjusting part, supporting pieces are arranged on one side of the fixing part and one side of the adjusting part, and adjustable ejector blocks are arranged at the tail ends of the supporting pieces. The adjustable top block is arranged, in the welding process of the expansion joint, the expansion joint is stably supported, it is guaranteed that the expansion joint cannot deform in the welding process, due to the adjustable function of the top block, the expansion joint welding device can adapt to expansion joints of different specifications, and the problem that the top block needs to be replaced when the expansion joints of different specifications are welded is solved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to an automatic argon arc welding device and method for the production of metal expansion joints. Background Technology

[0002] The bellows of thin-walled metal expansion joints are typically made of 310S (06Cr25Ni20) stainless steel, with a wall thickness of approximately 1.5mm, and the intermediate sealing plate and end pipe thickness is approximately 6mm, without rigid support. This structure is highly susceptible to plastic deformation during welding due to uneven local heat input, and the high-temperature environment exacerbates internal stress, fatigue, and crack propagation. While argon arc welding is suitable for welding thin-walled bellows expansion joints due to its controllable penetration and small heat-affected zone, the uneven heat diffusion in the X, Y, and Z directions during welding causes significant plastic deformation, leading to loss of dimensional and roundness control.

[0003] CN119216725A discloses an automated argon arc welding device, including a locking assembly comprising a track, a rotating plate, a fixed block, a stop block, a locking block, and a latching block. The rotating plate is disposed on the top of the track, and the fixed block is fixed to the top of the track. The fixed block has a slot, and the locking block is located within the slot. The fixed block has a movable groove, and the locking block is located within the movable groove. The rotating plate has a positioning groove, and one side of the latching block is fixed to the inner wall of the positioning groove, thus engaging with the positioning groove. By using the locking assembly, the track can be fixed to the outside of the workpiece without the need for additional tools, thereby reducing operation steps and time, and improving work efficiency. Simultaneously, the use of pulleys reduces the friction of the track on the outside of the workpiece, facilitating fine-tuning of the track's position.

[0004] During the welding process of expansion joints, a fixing block is added to the outer wall and rigidly supported by a special clamp to resist plastic flow and deformation at high temperatures. Since the location of plastic deformation is uncertain, the welding position of the expansion joint needs to be fully fixed. This means that expansion joints of different specifications require corresponding fixing blocks for stable support.

[0005] Therefore, this application proposes an automatic argon arc welding device capable of providing stable support for thin-walled metal expansion joints within a certain size range. Summary of the Invention

[0006] One of the objectives of this invention is to provide an automatic argon arc welding device and method for the production of metal expansion joints, which can stably support thin-walled corrugated pipes within a certain size range and avoid plastic deformation of the thin-walled corrugated pipes during the welding process.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: an automatic argon arc welding device for the production of metal expansion joints, comprising a support base for supporting the metal expansion joint and a sliding component disposed on one side of the support base that can move vertically, a welding torch disposed at the end of the sliding component, and the welding torch being able to swing to change the angle toward the metal expansion joint.

[0008] In the above scheme, a roller is provided on the inner side of the support base. The roller contacts the outer wall of the metal expansion joint. When the metal expansion joint rotates, the roller also rotates with the metal expansion joint. A rotating shaft is provided inside the support base. The roller is sleeved on the outside of the rotating shaft and moves axially and circumferentially relative to the rotating shaft. A slip ring is provided inside the roller. Hydraulic oil is disposed between the slip ring and the rotating shaft to form lubrication between the slip ring and the rotating shaft.

[0009] In the above scheme, a support spring is set between the rollers. The two ends of the support spring extend to the inside of the two rollers to support the rollers. The support spring limits the shortest distance between the two rollers, and the support spring can detach from the rollers to allow the rollers to move freely. When the support spring is inserted into the inside of the rollers, the rollers move synchronously.

[0010] In the above scheme, a rubber ring is set at the position where the roller and the support spring cooperate. The rubber ring is concave on the side, and the groove width of the rubber ring is smaller than the wire diameter of the support spring. After the support spring is inserted into the rubber ring, the rubber ring compresses the support spring.

[0011] In the above scheme, the sliding assembly includes a vertically placed drive slide and an extension arm whose height changes under the drive of the drive slide. The welding torch is installed at the end of the extension arm. The extension arm is a split type, including a fixed arm connected to the drive slide, a telescopic arm installed on the outside of the fixed arm, and a telescopic rod that changes the telescopic length of the telescopic arm. Under the drive of the telescopic rod, the telescopic arm changes its telescopic length.

[0012] In the above scheme, when the telescopic arm is in the middle of its telescopic length and the welding torch is perpendicular to the ground, the vertical projection point of the welding torch falls on the axis of the expansion joint.

[0013] In the above design, the section of the welding torch located inside the telescopic arm is a spherical sleeve. Both the upper and lower sides of the spherical sleeve are equipped with locking plates that can slide inside the telescopic arm. A magnetic element is installed between the locking plate and the telescopic arm. With the magnetic element in place, the locking plate slides and pushes the spherical sleeve to change the tilt angle of the welding torch. The welding torch is connected to a gas supply system to supply argon gas.

[0014] In the above scheme, the magnetic component is a combination of an electromagnet and a magnetic block. The magnetic block is fixed to the outside of the card plate, and the electromagnet is set in relation to the magnetic block. The electromagnet and the magnetic block work together to change the position of the card plate. A through hole is opened in the middle of the card plate, and the wall of the through hole is arc-shaped. When the electromagnet changes the position of the card plate through the magnetic block, the wall of the through hole fits against the spherical sleeve to change the tilt state of the welding gun.

[0015] In the above scheme, a guide rail is configured at the bottom of the support base, and a feeding mechanism is set at the bottom of the support base. The feeding mechanism drives the support base to move, changing the welding position corresponding to the welding gun, and the sliding component is fixed to the ground.

[0016] In the above scheme, the support base is a split type, including a fixing part and an adjusting part. The rotating shaft is fixed inside the fixing part and extends into the adjusting part. Support members are provided on one side of both the fixing part and the adjusting part. An adjustable top block is provided at the end of the support member. During the expansion joint welding process, the top block contacts the expansion joint welding position and supports the bellows.

[0017] In the above scheme, a hydraulic rod is installed inside the fixing part, and the telescopic end of the hydraulic rod is connected to the adjusting part. The telescopic movement of the hydraulic rod changes the position of the fixing part and the adjusting part, so as to achieve different length adjustments to adapt to the welding of expansion joints of different specifications.

[0018] In the above scheme, the support includes a rod that is inserted into the fixing part and the adjusting part. The rod can slide vertically. A chuck is provided on a section of the rod away from the fixing part and the adjusting part. When the top block supports the expansion joint, the chuck is coaxial with the expansion joint.

[0019] In the above scheme, a guide rod is provided on the inner side of the chuck to support the top block to move toward the expansion joint. The guide rods are evenly distributed on the inner side of the chuck and can swing relative to the chuck.

[0020] In the above scheme, the end of the guide rod facing the chuck is connected to the chuck by a pin, so that the guide rod can swing relative to the chuck. A motor is set on one side of the chuck, the motor is fixed to one end of the chuck and extends into the chuck. The output end of the motor can rotate relative to the chuck. The output end of the motor is equipped with a drive wheel, which is used to change the swing state of the guide rod.

[0021] In the above scheme, a buckle is set at one end of the guide rod extending into the chuck. The buckle connects the guide rod and the drive wheel. Magnetic plates are arranged inside both the chuck and the buckle. When the magnetic plates are magnetically attracted, the axis of the guide rod and the axis of the chuck intersect. A friction block is arranged inside the buckle. An electromagnetic ring is arranged at one end of the friction block extending into the buckle. The electromagnetic ring pushes the friction block to extend and retract. After the electromagnetic ring pushes the friction block to move outward, it contacts the drive wheel. The rotation of the drive wheel causes the buckle to swing, thereby controlling the swing of the guide rod. When the electromagnetic ring controls the friction block to retract, the friction block disengages from the drive wheel and resets under the force of the magnetic plate.

[0022] In the above scheme, the top block includes a mounting base for connecting the telescopic end of the guide rod and a clamping block disposed inside the mounting base and capable of swinging relative to the mounting base. The side of the clamping block that contacts the expansion joint is arc-shaped. A support component is disposed inside the mounting base to support the clamping block. The support component supports the clamping block at different angles.

[0023] In the above scheme, a pressure sensor is installed between the clamping block and the support assembly to measure the pressure change between the clamping block and the support assembly. When the clamping block supports the expansion joint, the deformation state of the bellows is determined based on the pressure change measured by the pressure sensor.

[0024] In the above scheme, the support component is an electromagnetic component. The swing state of the clamp is controlled by the magnetic force change generated by the electromagnetic component, so that the clamp and the mounting base cooperate to form support for the bellows.

[0025] In another design, the support component is a miniature support rod, which supports the clamping block to move outward, thereby changing the swing state of the clamping block and enabling the clamping block to cooperate with the mounting base to support the bellows.

[0026] A method for welding metal expansion joints, used in the aforementioned automatic argon arc welding apparatus, includes the following steps:

[0027] Check the welding procedure specification and process card, and confirm the welding material type, gas and welding parameters;

[0028] Check the bellows, end pipe bevel dimensions, and fit clearance;

[0029] Degreasing and rust removal → Polishing coarse pores and micro-cracks until the base metal is shiny;

[0030] Mark lines on the end faces of the end pipe and the bellows, as well as the flange of the connecting pipe, to ensure concentricity in the axial and helical directions;

[0031] Set the current, voltage, and welding speed to maintain a stable heat input;

[0032] The expansion joint is placed on the roller for support, and the top block is located inside the bellows to support the bellows;

[0033] The ring-shaped segmented symmetrical welding is used, and the top block obtains the deformation pressure of the bellows, and the support force is adjusted based on the deformation pressure.

[0034] Through the above technical solution, the present invention has the following beneficial effects:

[0035] 1. An adjustable top block is provided to stably support the expansion joint during the welding process, ensuring that the expansion joint will not deform during welding. Due to the adjustable function of the top block, it can be adapted to various expansion joints of different specifications, avoiding the problem of having to replace the top block when welding expansion joints of different specifications.

[0036] 2. The welding torch, whose angle can be freely adjusted, allows for adjustment based on the weld position during expansion joint welding to accommodate welds at different tilt angles. Furthermore, the welding distance can be fine-tuned by adjusting the welding torch, thereby ensuring the welding quality of the expansion joint.

[0037] 3. By determining the supporting force of the clamping block on the bellows, the supporting state of the expansion tube can be determined. During the welding process, the deformation of the expansion tube causes the supporting force of the clamping block on the bellows to change. By determining the change in supporting force, it can be determined whether the expansion tube will deform after welding, thus further ensuring the stability of the expansion tube after welding.

[0038] 4. By setting multiple guide rods, the position of the bellows can change with the position of the bellows when supporting it, avoiding the problem of the bellows still deforming during the cooling process after welding, and further ensuring the stability of the expansion joint after welding. The multiple guide rods can drive different top blocks to form stable support for the bellows.

[0039] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0040] Figure 1 This is a perspective view of the present invention;

[0041] Figure 2 This is a schematic diagram of the support base mounting structure of the present invention;

[0042] Figure 3 This is a schematic diagram of the sliding component of the present invention;

[0043] Figure 4 This is a schematic diagram of the extension arm of the present invention;

[0044] Figure 5 This is a schematic diagram of the internal structure of the telescopic arm of the present invention;

[0045] Figure 6 This is a schematic diagram of the magnetic component of the present invention;

[0046] Figure 7 This is a schematic diagram of the support base of the present invention;

[0047] Figure 8 This is a schematic diagram of the roller of the present invention;

[0048] Figure 9 This is a schematic diagram of the chuck of the present invention;

[0049] Figure 10 This is a side view of the chuck of the present invention;

[0050] Figure 11 This is a disassembled diagram of the chuck of the present invention;

[0051] Figure 12 This is a cross-sectional plan view of the chuck of the present invention;

[0052] Figure 13 This is a schematic diagram of the guide rod of the present invention;

[0053] Figure 14 This is a schematic diagram of the drive wheel of the present invention;

[0054] Figure 15 This is a top block cross-sectional view of the present invention.

[0055] In the diagram: 1. Support base; 2. Sliding assembly; 3. Welding torch; 4. Support component.

[0056] 11 Roller, 12 Shaft, 13 Slip ring, 14 Support spring, 15 Rubber ring;

[0057] 21 Drive slide, 22 Extending arm, 221 Fixed arm, 222 Telescopic arm, 223 Telescopic rod;

[0058] 23 Spherical sleeve, 24 Clamping plate, 25 Magnetic component, 26 Electromagnet, 27 Magnetic block, 28 Perforation;

[0059] 111 Guide rail, 112 Control assembly, 113 Fixing part, 114 Adjusting part, 115 Hydraulic rod;

[0060] 41 Insert rod, 42 Chuck, 43 Guide rod, 44 Motor, 45 Drive wheel, 46 Buckle, 47 Magnetic plate, 48 Electromagnetic ring, 49 Friction block;

[0061] 410 Top block, 411 Mounting base, 412 Clamping block, 413 Support assembly, 414 Pressure sensor. Detailed Implementation

[0062] The following describes several embodiments of the present invention with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. And features of different embodiments may be interchanged if feasible.

[0063] Unless otherwise defined, all terms used herein (including technical and scientific terms) have their ordinary meanings, which are understandable to those skilled in the art. Furthermore, the definitions of the foregoing terms in commonly used dictionaries should be interpreted in the context of this specification as having the meaning consistent with the relevant field of this invention. Unless specifically defined, these terms will not be construed as having idealized or overly formal meanings.

[0064] The following explains the relationships and terms used in this application:

[0065] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism. It allows for situations where the parallelism is not absolute due to factors such as assembly tolerance, design tolerance, and structural flatness. It also allows for errors within a small angular range, such as within 10 degrees of assembly error. These can all be considered as parallel relationships.

[0066] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0067] Ground: The ground as defined in this application is not limited to a specific material or region, but simply refers to a platform on which this application is supported, and allows for stacking, tilting, and variations in flatness. For example, cement floors, tile floors, work platforms, etc., can all be interpreted as ground.

[0068] The above explanation does not fully encompass the relationship definition given in this application, but only represents a part of it.

[0069] First Embodiment

[0070] See Figure 1-8 As shown, the first embodiment of the present invention provides an automatic argon arc welding device for the production of metal expansion joints, including a support base 1 for supporting the metal expansion joint and a sliding component 2 disposed on one side of the support base 1 and capable of vertical movement. The welding torch 3 is disposed at the end of the sliding component 2, and the welding torch 3 can swing to change the angle toward the metal expansion joint.

[0071] A roller 11 is provided on the inner side of the support base 1. The roller 11 contacts the outer wall of the metal expansion joint. When the metal expansion joint rotates, the roller 11 also rotates with the metal expansion joint. A rotating shaft 12 is provided inside the support base 1. The roller 11 is sleeved on the outer side of the rotating shaft 12 and moves axially and circumferentially relative to the rotating shaft 12. A slip ring 13 is provided inside the roller 11. Hydraulic oil is disposed between the slip ring 13 and the rotating shaft 12 to form lubrication between the slip ring 13 and the rotating shaft 12.

[0072] A support spring 14 is provided between the rollers 11. The two ends of the support spring 14 extend to the inner side of the two rollers 11 to support the rollers 11. The support spring 14 limits the shortest distance between the two rollers 11. The support spring 14 can be detached from the rollers 11 to allow the rollers 11 to move freely. When the support spring 14 is inserted into the rollers 11, the rollers 11 move synchronously.

[0073] By setting a sliding roller 11, the position can be changed according to different expansion joint specifications during use. By limiting the shortest distance of the roller 11 by the support spring 14, collisions can be avoided during the sliding process. Since the expansion joint is a whole, the rollers 11 installed on the outside of the same rotating shaft 12 rotate in the same direction and at the same speed, thereby avoiding friction between the rollers 11 and the support spring 14.

[0074] To further ensure the service life of the roller 11 after it is connected to the support spring 14, and to ensure the stability of the support spring 14 when it is inserted into the roller 11, a rubber ring 15 is provided at the position where the roller 11 and the support spring 14 cooperate. The rubber ring 15 is recessed on the side, and the groove width of the rubber ring 15 is smaller than the wire diameter of the support spring 14. After the support spring 14 is inserted into the rubber ring 15, the rubber ring 15 compresses the support spring 14.

[0075] In a further embodiment of the first embodiment, the sliding assembly 2 includes a vertically placed drive slide 21 and an extension arm 22 whose height changes under the drive of the drive slide 21. The welding torch 3 is installed at the end of the extension arm 22. The extension arm 22 is a split type, including a fixed arm 221 connected to the drive slide 21, a telescopic arm 222 installed on the outside of the fixed arm 221, and a telescopic rod 223 that changes the telescopic length of the telescopic arm 222. Under the drive of the telescopic rod 223, the telescopic arm 222 changes its telescopic length.

[0076] When the telescopic arm 222 is in the middle of its telescopic length and the welding torch 3 is perpendicular to the ground, the vertical projection point of the welding torch 3 falls on the axis of the expansion joint.

[0077] Furthermore, the section of the welding torch 3 located inside the telescopic arm 222 is a spherical sleeve 23. Both the upper and lower sides of the spherical sleeve 23 are equipped with locking plates 24, which can slide inside the telescopic arm 222. A magnetic element 25 is disposed between the locking plate 24 and the telescopic arm 222. With the magnetic element 25 in place, the locking plate 24 slides and pushes the spherical sleeve 23 to change the tilt angle of the welding torch 3. The welding torch 3 is connected to a gas supply system to supply argon gas.

[0078] The magnetic component 25 is a combination of an electromagnet 26 and a magnetic block 27. The magnetic block 27 is fixed to the outside of the card plate 24, and the electromagnet 26 is set in relation to the magnetic block 27. The electromagnet 26 and the magnetic block 27 work together to change the position of the card plate 24. A through hole 28 is opened in the middle of the card plate 24. The wall of the through hole 28 is arc-shaped. When the electromagnet 26 changes the position of the card plate 24 through the magnetic block 27, the wall of the through hole 28 fits against the spherical sleeve 23 to change the tilt state of the welding gun 3.

[0079] Second Embodiment

[0080] See Figure 9-15As shown, the second embodiment of this application provides an automatic argon arc welding device for the production of metal expansion joints, including a support base 1 for supporting the metal expansion joint and a sliding component 2 disposed on one side of the support base 1 and capable of vertical movement. A welding torch 3 is disposed at the end of the sliding component 2, and the welding torch 3 can swing to change its angle toward the metal expansion joint. A roller 11 is disposed on the inner side of the support base 1, and the roller 11 contacts the outer wall of the metal expansion joint. Since its structure is the same as that of the first embodiment, the resulting technical effects will not be described in detail here.

[0081] In a further embodiment of the second embodiment, a guide rail 111 is provided at the bottom of the support base 1, and a feeding mechanism is provided at the bottom of the support base 1. The feeding mechanism drives the support base 1 to move, changing the welding position corresponding to the welding torch 3, and the sliding component 2 is fixed to the ground.

[0082] The guide rail 111 is set on the ground to limit the movement direction of the support 1. That is, when the feed mechanism drives the support 1 to move, the support 1 only moves along the direction set by the guide rail 111. The front end of the support 1 is provided with a control component 112, which is used to set the welding parameters of the argon arc welding device and the movement parameters of the support 1.

[0083] In a further embodiment of the second embodiment, the support base 1 is a split type, including a fixing part 113 and an adjusting part 114. The rotating shaft 12 is fixed inside the fixing part 113 and extends into the adjusting part 114. Support members 4 are arranged on one side of both the fixing part 113 and the adjusting part 114. An adjustable top block 410 is arranged at the end of the support member 4. During the expansion joint welding process, the top block 410 contacts the expansion joint welding position and supports the bellows.

[0084] The fixing part 113 is equipped with a hydraulic rod 115. The telescopic end of the hydraulic rod 115 is connected to the adjusting part 114. The telescopic movement of the hydraulic rod 115 changes the position of the fixing part 113 and the adjusting part 114, so as to realize the adjustment of different lengths to adapt to the welding of expansion joints of different specifications.

[0085] The support member 4 includes a rod 41 that is inserted into the fixing part 113 and the adjusting part 114. The rod 41 can slide vertically. A chuck 42 is provided on a section of the rod 41 that is away from the fixing part 113 and the adjusting part 114. When the top block 410 supports the expansion joint, the chuck 42 is coaxial with the expansion joint.

[0086] In addition, a guide rod 43 is provided on the inner side of the chuck 42 to support the top block 410 to move toward the expansion joint. The guide rod 43 is evenly distributed on the inner side of the chuck 42 and can swing relative to the chuck 42.

[0087] The guide rod 43 drives the top block 410 to extend and retract, enabling the top block 410 to stably contact the inner wall of the bellows. Due to the extension and retraction of the guide rod 43, it can be adjusted to accommodate expansion joints of different specifications, thereby ensuring stable support for expansion joints of different specifications.

[0088] The guide rod 43 is connected to the chuck 42 via a pin at one end, allowing the guide rod 43 to swing relative to the chuck 42. A motor 44 is installed on one side of the chuck 42, fixed to one end of the chuck 42 and extending into the chuck 42. The output end of the motor 44 can rotate relative to the chuck 42. A drive wheel 45 is installed at the output end of the motor 44, which is used to change the swing state of the guide rod 43.

[0089] The guide rod 43 extends into the chuck 42, where a buckle 46 is provided. The buckle 46 connects the guide rod 43 and the drive wheel 45. Both the chuck 42 and the buckle 46 are equipped with magnetic plates 47. When the magnetic plates 47 are magnetically attracted, the axis of the guide rod 43 intersects with the axis of the chuck 42. A friction block 49 is provided inside the buckle 46. An electromagnetic ring 48 is provided at the end of the friction block 49 that extends into the buckle 46. The electromagnetic ring 48 pushes the friction block 49 to extend and retract. After the electromagnetic ring 48 pushes the friction block 49 to move outward, it contacts the drive wheel 45. The drive wheel 45 rotates, causing the buckle 46 to swing, thereby controlling the swing of the guide rod 43. When the electromagnetic ring 48 controls the friction block 49 to retract, the friction block 49 disengages from the drive wheel 45 and resets under the force of the magnetic plates 47.

[0090] The guide rod 43 is connected to the drive wheel 45 by the buckle 46, and the connection state between the buckle 46 and the drive wheel 45 is controlled by the cooperation of the electromagnetic ring 48, the magnetic plate 47 and the friction block 49. When the friction block 49 is connected to the drive wheel 45, the rotation of the drive wheel 45 can drive the guide rod 43 corresponding to the friction block 49 to move. When the friction block 49 is disengaged from the drive wheel 45, the guide rod 43 is reset.

[0091] In a further embodiment of the second embodiment, the top block 410 includes a mounting base 411 connecting the telescopic end of the guide rod 43 and a clamping block 412 disposed inside the mounting base 411 and capable of swinging relative to the mounting base 411. The side of the clamping block 412 that contacts the expansion joint is arc-shaped. A support component 413 is disposed inside the mounting base 411 to support the clamping block 412. The support component 413 supports the clamping block 412 at different angles.

[0092] As the expansion joint specifications change, its curvature also changes. Using a fixed top block 410 to support the expansion joint will reduce the support range between the top block 410 and the expansion joint, affecting the support effect of the top block 410. However, by using an adjustable clamp 412, the state of the clamp 412 can be adjusted according to the curvature of the expansion joint during use, ensuring the support effect for the expansion joint.

[0093] A pressure sensor 414 is provided between the clamping block 412 and the support assembly 413 to measure the pressure change between the clamping block 412 and the support assembly 413. When the clamping block 412 supports the expansion joint, the deformation state of the bellows is determined based on the pressure change measured by the pressure sensor 414.

[0094] The plastic deformation that occurs during the welding of the bellows will affect the supporting force that stabilizes the bellows. The pressure sensor 414 determines the pressure change of the clamp 412 and obtains the pressure status, thereby determining the change of the bellows. After the welding is completed, the pressure feedback of the bellows to the pressure sensor 414 determines whether the top block 410 needs to follow the movement of the bellows to support the bellows.

[0095] In one embodiment of the second embodiment, the support component 413 is an electromagnetic component. The swing state of the clamp 412 is controlled by the change of magnetic force generated by the electromagnetic component, so that the clamp 412 cooperates with the mounting base 411 to form support for the bellows.

[0096] In another embodiment of the second embodiment, the support component 413 is a miniature support rod. The miniature support rod supports the clamping block 412 to move outward, thereby changing the swing state of the clamping block 412, so that the clamping block 412 cooperates with the mounting base 411 to form support for the bellows.

[0097] The support component 413 can stably adjust the clamping block 412. After setting the support force for the bellows, the support component 413 adjusts the clamping block 412 according to the required support force, so that the clamping block 412 can stably support the bellows and ensure the stability of the bellows.

[0098] When the bellows deforms, the pressure detected by the pressure sensor 414 changes, and the support force is further adjusted by the support component 413. Alternatively, after welding is completed, the top block 410 can be moved with the bellows by the swing of the guide rod 43, which further ensures strong support for the bellows during the cooling process.

[0099] Third Embodiment

[0100] The third embodiment of this application provides a method for welding metal expansion joints, used in the automatic argon arc welding apparatus proposed in the above embodiments, including the following steps:

[0101] Check the welding procedure specification and process card, and confirm the welding material type, gas and welding parameters;

[0102] Check the bellows, end pipe bevel dimensions, and fit clearance;

[0103] Degreasing and rust removal → Polishing coarse pores and micro-cracks until the base metal is shiny;

[0104] Mark lines on the end faces of the end pipe and the bellows, as well as the flange of the connecting pipe, to ensure concentricity in the axial and helical directions;

[0105] Set the current, voltage, and welding speed to maintain a stable heat input;

[0106] The expansion joint is placed on the roller 11 for support, and the top block 410 is located inside the bellows to support the bellows;

[0107] The annular segmented symmetrical welding is used, and the top block 410 obtains the deformation pressure of the bellows, and the support force is adjusted based on the deformation pressure.

[0108] In summary, the technical solutions disclosed in the above embodiments of the present invention have at least the following advantages:

[0109] An adjustable top block is provided to stably support the expansion joint during welding, ensuring that the expansion joint does not deform during welding. Furthermore, due to the adjustable function of the top block, it can be adapted to various expansion joints of different specifications, avoiding the need to replace the top block when welding expansion joints of different specifications.

[0110] The welding torch, whose angle can be freely adjusted, allows for adjustments based on the weld position during expansion joint welding to accommodate welds at different tilt angles. Furthermore, the welding distance can be fine-tuned by adjusting the welding torch, thereby ensuring the welding quality of the expansion joint.

[0111] By determining the supporting force of the clamping block on the bellows, the support state of the expansion tube can be determined. During the welding process, the deformation of the expansion tube causes the supporting force of the clamping block on the bellows to change. By determining the change in the supporting force, it can be determined whether the expansion tube will deform after welding, thus further ensuring the stability of the expansion tube after welding.

[0112] By setting multiple guide rods, the position of the bellows can change with the position of the bellows when supporting it, avoiding the problem of the bellows still deforming during the cooling process after welding, and further ensuring the stability of the expansion joint after welding. The multiple guide rods can drive different top blocks to form stable support for the bellows.

[0113] Although the present invention has been disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. An automatic argon arc welding device for metal expansion joint production, comprising a support seat (1) for supporting the metal expansion joint and a sliding assembly (2) arranged on one side of the support seat (1) and capable of vertical movement, a welding torch (3) arranged at the end of the sliding assembly (2) and capable of swinging to change the angle towards the metal expansion joint, characterized in that, the support seat (1) is arranged in a split type, comprising a fixed part (113) and an adjusting part (114), a rotating shaft (12) is fixed to the inner side of the fixed part (113) and extends into the adjusting part (114), the fixed part (113) and the adjusting part (114) are provided with support pieces (4) on one side, the end of the support piece (4) is provided with an adjustable top block (410), during the welding process of the expansion joint, the top block (410) contacts the welding position of the expansion joint and supports the corrugated pipe.

2. The automatic argon arc welding device for producing a metal expansion joint according to claim 1, characterized in that, The inside of the fixed part (113) is provided with a hydraulic rod (115), the telescopic end of the hydraulic rod (115) is connected to the adjusting part (114), and the telescopic change of the hydraulic rod (115) changes the position of the fixed part (113) and the adjusting part (114).

3. The automatic argon arc welding device for producing a metal expansion joint according to claim 2, characterized in that, The support piece (4) comprises an insertion rod (41) inserted into the inside of the fixed part (113) and the adjusting part (114), the insertion rod (41) can slide vertically, a chuck (42) is arranged on the section of the insertion rod (41) away from the fixed part (113) and the adjusting part (114), and the chuck (42) is coaxial with the expansion joint when the top block (410) supports the expansion joint; The inside of the chuck (42) is provided with a guide rod (43) for supporting the movement of the top block (410) towards the expansion joint, the guide rods (43) are uniformly arranged on the inside of the chuck (42), and the guide rods (43) can swing relative to the chuck (42).

4. The automatic argon arc welding device for producing a metal expansion joint according to claim 3, characterized in that, The end of the guide rod (43) towards the chuck (42) is connected with the chuck (42) through a pin shaft, so that the guide rod (43) can swing relative to the chuck (42), a motor (44) is arranged on one side of the chuck (42), the motor (44) is fixed to one end of the chuck (42) and extends into the inside of the chuck (42), the output end of the motor (44) can rotate relative to the chuck (42), a drive wheel (45) is arranged on the output end of the motor (44), and the drive wheel (45) is used to change the swinging state of the guide rod (43).

5. The automatic argon arc welding device for producing a metal expansion joint according to claim 4, characterized in that, The guide rod (43) extends to the end inside the chuck (42) and is provided with a buckle (46), the buckle (46) connects the guide rod (43) and the driving wheel (45), the chuck (42) and the inside of the buckle (46) are provided with magnetic plates (47), under the magnetic attraction of the magnetic plates (47), the axis of the guide rod (43) and the axis of the chuck (42) intersect, the inside of the buckle (46) is provided with a friction block (49), the end of the friction block (49) extending to the inside of the buckle (46) is provided with an electromagnetic ring (48), the electromagnetic ring (48) drives the friction block (49) to stretch and shrink, after the friction block (49) is driven by the electromagnetic ring (48) to move outward and contacts the driving wheel (45), the driving wheel (45) rotates to drive the buckle (46) to swing and control the guide rod (43) to swing, when the electromagnetic ring (48) controls the friction block (49) to shrink, the friction block (49) is separated from the contact with the driving wheel (45), and is reset under the action of the magnetic plate (47).

6. The automatic argon arc welding device for producing a metal expansion joint according to claim 5, characterized by, The top block (410) includes a mounting seat (411) connected to the telescopic end of the guide rod (43) and a clamping block (412) provided inside the mounting seat (411) and capable of swinging relative to the mounting seat (411), one side of the clamping block (412) contacting the expansion joint is arc-shaped, and the inside of the mounting seat (411) is provided with a supporting assembly (413) supporting the clamping block (412) at different angles.

7. The automatic argon arc welding device for producing a metal expansion joint according to claim 1, characterized by, The inside of the supporting seat (1) is provided with a roller (11) contacting the outer wall of the metal expansion joint, when the metal expansion joint rotates, the roller (11) also rotates with the metal expansion joint, the inside of the supporting seat (1) is provided with a rotating shaft (12), the roller (11) is sleeved outside the rotating shaft (12) and moves axially and circumferentially relative to the rotating shaft (12), the inside of the roller (11) is provided with a slip ring (13), and hydraulic oil is arranged between the slip ring (13) and the rotating shaft (12) to form lubrication between the slip ring (13) and the rotating shaft (12).

8. The automatic argon arc welding device for producing a metal expansion joint according to claim 6, characterized by, The sliding assembly (2) includes a driving sliding table (21) vertically placed and an extension arm (22) changing height under the driving of the driving sliding table (21), and the welding gun (3) is installed at the end of the extension arm (22), the extension arm (22) is provided in a split mode and includes a fixed arm (221) connected to the driving sliding table (21), a telescopic arm (222) installed outside the fixed arm (221), and a telescopic rod (223) changing the telescopic length of the telescopic arm (222), under the driving of the telescopic rod (223), the telescopic length of the telescopic arm (222) is changed.

9. The automatic argon arc welding device for producing a metal expansion joint according to claim 8, characterized by, A section of the welding gun (3) inside the telescopic arm (222) is a spherical sleeve (23), both sides of the spherical sleeve (23) are provided with clamping plates (24), the clamping plates (24) can slide inside the telescopic arm (222), and magnetic members (25) are arranged between the clamping plates (24) and the telescopic arm (222). Under the arrangement of the magnetic members (25), the clamping plates (24) slide and push the spherical sleeve (23) to change the inclination angle of the welding gun (3), the welding gun (3) is connected with a gas supply system to realize the supply of argon.

10. A method of welding a metal expansion joint for use in an automatic argon arc welding device as claimed in any one of claims 1-9, characterized in that, The method comprises the following steps: Check the welding procedure specification and process card, confirm the welding material model, gas and welding parameters; Check the bellows, end pipe groove size, fit clearance; Remove oil and rust, polish the rough hole and micro crack to the base metal brightness; Mark the end pipe and bellows end face and connecting pipe flange to ensure axial and rotational concentricity; Set the current, voltage and welding speed to keep stable heat input; Place the expansion joint on the roller (11) for support, and the top block (410) is located in the bellows to support the bellows; Symmetrical welding of ring segments, the top block (410) obtains the deformation pressure of the bellows, and the support force is adjusted based on the deformation pressure.

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