A transverse seam welding device for nuclear power heat exchanger

Abstract

The present invention is a transverse seam welding device for a nuclear power heat exchanger, which relates to the technical field of nuclear power equipment production and processing, including a table, a turning frame installed between a first vertical table and a second vertical table, a first rotating shaft installed on the first vertical table, a reciprocating transmission mechanism connected to the outer end of the first rotating shaft, a lifting support mechanism installed in the turning frame, an oblique downward pressing mechanism installed on the front and rear sides of the turning frame, a horizontal pipe pushing mechanism installed on the left and right ends of the turning frame, a vertical pipe rotating mechanism installed on the gantry, a welding gun bracket provided on the outer side of the support beam on the side of the third vertical table, and a vertically arranged laser welding gun fixedly installed in the welding gun bracket. On the one hand, the present invention can effectively avoid interference from multiple heat sources, so as to eliminate the risk of uncontrolled deformation and microcracks, and improve the grain refinement of the weld. On the other hand, it can stabilize the fluctuation of the weld excess height within the standard range, reduce the coaxiality deviation, and thus improve the quality of the transverse seam welding operation.

Description

Technical Field

[0001] The invention relates to the technical field of production and processing of nuclear power equipment, and particularly discloses a transverse seam welding device for a nuclear power heat exchanger. Background Art

[0002] The heat transfer tubes in nuclear power heat exchangers are core heat exchange components and critical safety barriers. Their primary function is to efficiently transfer heat generated by the reactor core between the primary radioactive coolant and the secondary non-radioactive working fluid, converting feedwater into steam to drive power generation. Heat transfer tubes in nuclear power heat exchangers are typically U-shaped and straight tubes, with straight tube lengths typically ranging from 8 to 15 meters. The condenser section in some split heat transfer tubes can reach a total length of 16 to 30 meters. Because the heat transfer tube wall is the critical pressure-bearing boundary isolating radioactive materials, to prevent radioactive leakage accidents such as SGTRs, the heat transfer tubes must maintain their structural integrity over long periods of time under high temperatures, high pressure differentials, severe corrosion, and complex stresses. Therefore, in the production and processing of nuclear power equipment, welding processes are generally used instead of flange connections. Multiple standard-sized heat transfer tubes are welded together to produce heat transfer tubes of the required length for nuclear power heat exchangers.

[0003] The circular weld formed by butting two standard heat transfer pipes is called a transverse seam. Nuclear power equipment production workers typically need to secure the heat transfer pipes to a work platform and horizontally circle the welding torch along the vertical surface to perform the welding operation. Patent publication number CN110270738B discloses automatic transverse seam welding equipment for air ducts, including a welding frame. This prior art involves placing the pipes on a feed platform, securing them with a workpiece clamping device, and then performing transverse seam welding of the two pipes using a mobile welding torch mounted on a gantry beam.

[0004] The mobile welding gun in the above-mentioned prior art can only move horizontally, and the transverse seam between the two standard heat transfer pipes is annular, resulting in a welding blind area. Therefore, in order to ensure the integrity of the transverse seam welding, most technicians in this field adopt the following two operating methods to avoid the occurrence of welding blind areas. On the one hand, some technicians are equipped with multiple mobile welding guns to work simultaneously, and by arranging the mobile welding guns around the transverse seam, they can perform a complete welding operation on it; on the other hand, some technicians set up a partial shutdown stage during the welding operation of the mobile welding gun. During this stage, the mobile welding gun can be manually rotated to weld the welding blind area, thereby performing a complete welding operation on it. Both of the above-mentioned operating methods have obvious technical defects. First, when multiple mobile welding guns are performing welding operations at the same time, it is easy for the heat input to be superimposed, causing the molten pool to be disordered, thereby leading to uncontrolled deformation and residual stress concentration, which can easily induce cracks and seriously affect the welding quality. Second, the discreteness of the manually rotated pipe can easily cause the weld height to fluctuate by more than 1.2mm (the standard operating fluctuation range is 0.8mm), making the overall welding quality uncontrollable. It can be seen that both of the above-mentioned operation methods have the problem of low welding quality when welding the transverse seams of heat transfer tubes. If heat transfer tubes with substandard welding quality are actually used, it is easy to cause leakage of high-temperature and high-pressure coolant in the first circuit, contaminating the steam system in the second circuit. In serious cases, it will accelerate stress corrosion cracking, causing cross-contamination of the medium between the tubes, and directly cause radioactive leakage accidents, resulting in unpredictable risks. Summary of the Invention

[0005] Aiming at the problem of low welding quality during the current transverse seam welding operation on the heat transfer tubes of nuclear power heat exchangers, the present invention provides a transverse seam welding device for nuclear power heat exchangers.

[0006] To solve the above problems, the present invention provides the following technical solutions:

[0007] A transverse seam welding device for a nuclear power heat exchanger comprises a table plate, on which a first vertical table and a second vertical table are fixedly mounted, a turning frame is rotatably mounted between the first vertical table and the second vertical table, a first rotating shaft is rotatably mounted on the first vertical table, the outer end portion of the first rotating shaft is connected to a reciprocating transmission mechanism for driving the turning frame 90 degrees, a plurality of symmetrically arranged lifting support mechanisms are fixedly mounted in the turning frame, the lifting support mechanisms are used to stably support two nuclear power heat exchanger heat transfer tubes and to adjust the lifting and lowering thereof, a plurality of staggered oblique downward pressing mechanisms are mounted on both sides of the turning frame, the oblique downward pressing mechanisms are used to stably press the two nuclear power heat exchanger heat transfer tubes, and two symmetrically arranged lifting support mechanisms are fixedly mounted on both ends of the turning frame. A transverse tube pushing mechanism, two transverse tube pushing mechanisms are used to push two nuclear power heat exchanger heat transfer tubes and reduce the distance between them. A gantry is provided on the periphery of the two transverse tube pushing mechanisms. The gantry is arranged above the flip frame and slides with it. A vertical tube rotating mechanism is installed on the gantry. The vertical tube rotating mechanism is used to vertically rotate the nuclear power heat exchanger heat transfer tube 180°. A third vertical platform is fixedly installed on the table plate. The third vertical platform is arranged on the rear side of the flip frame. A support beam arranged above the flip frame is fixedly installed on the side of the third vertical platform. A vertically lifting welding gun bracket is provided on the outside of the support beam. A vertically arranged laser welding gun is fixedly installed in the welding gun bracket. The laser welding gun is used to perform welding operations on the transverse seams where the two nuclear power heat exchanger heat transfer tubes are in contact.

[0008] Preferably, the inner sides of the first and second upright platforms are both provided with a rotating disc that cooperates with each other, and a support seat is fixedly installed on the inner disk surface of the turntable, and the support seat is fastened to the bottom of the flip frame; a support platform is provided on the side of the first upright platform, and the reciprocating transmission mechanism includes a vertical plate that is fastened to the support platform, the vertical plate is rotatably matched with the first rotating shaft, and the second rotating shaft and the third rotating shaft are rotatably installed in the vertical plate; the outer peripheries of the second rotating shaft and the third rotating shaft are respectively fastened with a first gear disc and a second gear disc, and the first gear disc and the second gear disc are meshed for transmission, The first rotating shaft is provided with a first transmission disc on the periphery thereof, and a second transmission disc and a third transmission disc are fixedly mounted on the outer sides of the first gear disc and the second gear disc respectively, and the first transmission disc cooperates with the second transmission disc and the third transmission disc in transmission; a first servo motor and a shaft seat are fixedly mounted on the support platform, a connecting shaft is rotatably mounted on the shaft seat, and the connecting shaft is connected to the second rotating shaft, a first disc is fastenedly mounted on the periphery of the output shaft of the first servo motor, and a second disc is fastenedly mounted on the periphery of the connecting shaft, and a belt strip for transmission is commonly mounted between the first disc and the second disc.

[0009] Preferably, the upper, lower and right sides of the first transmission plate are respectively provided with a first arc-shaped groove, a second arc-shaped groove and a third arc-shaped groove with the same curvature, and the second transmission plate and the third transmission plate are both provided with a transmission part, and the transmission part is provided with a first arc-shaped convex surface, a second arc-shaped convex surface and an arc-shaped concave surface, the first arc-shaped convex surface and the second arc-shaped convex surface have the same curvature size as the first arc-shaped groove, the curvature size of the arc-shaped concave surface is larger than that of the first arc-shaped groove, and the first arc-shaped convex surface and the second arc-shaped convex surface are both in contact and sliding with the inner groove surfaces of the first arc-shaped groove, the second arc-shaped groove and the third arc-shaped groove.

[0010] Preferably, a first strip groove is provided between the first arc groove and the third arc groove, and a second strip groove is provided between the second arc groove and the third arc groove. The angle between the first strip groove and the second strip groove is °. The second transmission disk and the third transmission disk are both provided with protrusions, and round rods are fixedly installed on the two protrusions. The outer peripheral wall of the round rod can slide with the inner groove wall of the first strip groove and the second strip groove.

[0011] Preferably, the lifting support mechanism includes a first mounting plate fastened to the flip frame, a first guide rod cylinder arranged vertically is fixedly mounted on the first mounting plate, a mounting seat is fixedly provided on the end of the piston rod of the first guide rod cylinder, a stabilizing seat is fixedly provided on the mounting seat, a fourth arc-shaped groove is provided on the stabilizing seat, a plurality of balls are rotatably mounted in the fourth arc-shaped groove, and the outer wall of the ball is in sliding contact with the outer peripheral wall of the heat transfer tube of the nuclear power heat exchanger.

[0012] Preferably, the oblique downward pressing mechanism includes a first base fastened to the flip frame, a first base is fixedly mounted on the side of the first base, a first pen-shaped cylinder is hingedly mounted on the first base, a push plate is hingedly mounted on the end of the piston rod of the first pen-shaped cylinder, a second base and a third base are fixedly mounted on the top of the first base, one end of the bottom of the push plate is hinged to the second base, and the other end of the bottom of the push plate is in contact with the third base, a second guide rod cylinder is fixedly mounted on the side of the push plate, a first rubber block is fixedly mounted on the end of the piston rod of the second guide rod cylinder, and the first rubber block can be in contact with the outer peripheral wall of the heat transfer tube of the nuclear power heat exchanger.

[0013] Preferably, the horizontal tube pushing mechanism includes a fourth base fastened to the flip frame, a second pen-shaped cylinder arranged vertically is hingedly mounted on the fourth base, a fifth base is fixedly mounted on the flip frame, a receiving plate is hingedly mounted on the fifth base, the piston rod end of the second pen-shaped cylinder is hingedly mounted with a first receiving block, the first receiving block is fastened to the receiving plate, a second base is fixedly mounted on the receiving plate, a first push rod is fixedly mounted on the inner side of the second base, a third pen-shaped cylinder arranged horizontally is hingedly mounted on the top of the second base, a second receiving block is hingedly mounted on the end of the third pen-shaped cylinder, a second push rod is fixedly mounted on the inner side of the second receiving block, and both the first and second push rods can contact the outer end of the heat transfer tube of the nuclear power heat exchanger.

[0014] Preferably, a sixth base and a guide rail are fixedly installed on the flip frame, a horizontally arranged fourth pen-shaped cylinder is fixedly installed on the sixth base, a matching slider is installed on the guide rail, the slider is fastened to the bottom end of the gantry, and the piston rod end of the fourth pen-shaped cylinder is fastened to the side of the gantry.

[0015] Preferably, the vertical pipe rotation mechanism includes an electric rail fixedly mounted on the inner side of the top end of the gantry, a second servo motor for driving the electric rail is fixedly mounted on the outer side of the top end of the gantry, a first adjustment seat and a second adjustment seat are slidably mounted on the electric rail, a fifth pen-shaped cylinder and a sixth pen-shaped cylinder arranged vertically are fixedly mounted on the first adjustment seat and the second adjustment seat respectively, the piston rod stroke directions of the fifth pen-shaped cylinder and the sixth pen-shaped cylinder are set in opposite directions, the piston rod ends of the fifth pen-shaped cylinder and the sixth pen-shaped cylinder are fixedly mounted with a third receiving block and a fourth receiving block respectively, the inner sides of the third receiving block and the fourth receiving block are fixedly mounted with a second rubber block and a third rubber block respectively, the second rubber block and the third rubber block can both contact the outer peripheral wall of the heat transfer tube of the nuclear power heat exchanger.

[0016] Preferably, a vertically arranged screw slide is fixedly installed on the outer side of the support beam, a third servo motor for driving the screw end of the screw slide is fixedly installed on the top of the screw slide, an assembly plate is fixedly installed on the sliding end of the outer side of the screw slide, the assembly plate is fastened to the welding gun bracket, a cross bar fastened to the assembly plate is provided on the side of the welding gun bracket, and a position-adjustable industrial 3D camera is installed on the cross bar.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention employs a 90° reciprocating tilting frame for coordinated operation with the laser welding gun. The tilting frame, with precise coordination between the first, second, and third transmission discs, automatically rotates 90° four times, ensuring that the laser welding gun only needs to move in one direction to cover a quarter of the arc segment of the annular transverse seam. This step-by-step welding process effectively avoids interference from multiple heat sources. By incorporating an industrial 3D camera to monitor the molten pool state in real time, the laser power can be dynamically adjusted to control heat input fluctuations within a standard range. This solves the problem of heat input superposition caused by the simultaneous operation of multiple welding guns, eliminates the risk of uncontrolled deformation and microcracking, and improves weld grain refinement, thereby ensuring the quality of transverse seam welding of heat transfer tubes in nuclear power heat exchangers.

[0019] 2. The present invention utilizes a reciprocating drive mechanism with a round rod and strip groove structure to precisely rotate the heat transfer tube of a nuclear power heat exchanger 90°. Furthermore, the invention utilizes a vertical tube rotation mechanism to cause the fifth and sixth pen-shaped cylinders to push the second and third rubber blocks in opposite directions, respectively, causing the heat transfer tube of the nuclear power heat exchanger to flip 180°. The coordinated operation of these two mechanisms enables full-range blind-spot welding of transverse seams, stabilizes weld height fluctuations within standard ranges, reduces coaxiality deviations, and further improves transverse seam welding quality.

[0020] 3. The present invention can be used to match nuclear power heat exchanger heat transfer tubes of different diameters by providing a lifting support mechanism. With the help of a horizontal tube pushing mechanism, the gap between two nuclear power heat exchanger heat transfer tubes can be connected, and a uniform pressing force is provided by an oblique downward pressing mechanism, thereby improving the stability of the nuclear power heat exchanger heat transfer tubes during welding operations. At the same time, the present invention reduces the interference of manual operations by providing a control component that cooperates with a servo motor and a cylinder, which not only eliminates the risk of personnel radiation exposure, but also greatly improves the production and processing efficiency of nuclear power equipment, providing core technical support for nuclear power safety and cost reduction, and therefore has very broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation structure of the turning frame of the present invention;

[0024] Figure 3 This is a schematic diagram of the heat transfer tube arrangement structure of a nuclear power heat exchanger according to the present invention;

[0025] Figure 4 This is a schematic diagram of the mounting structure of the turntable and the support base of the present invention;

[0026] Figure 5 This is a schematic diagram of the installation structure of the first transmission plate, the second transmission plate, and the third transmission plate of the present invention;

[0027] Figure 6 This is a schematic diagram of the transmission structure of the first disc and the second disc of the present invention;

[0028] Figure 7 This is a schematic diagram of the installation structure of the first and second gear discs of the present invention;

[0029] Figure 8 This is a schematic structural diagram of the first transmission plate of the present invention;

[0030] Figure 9 It is a schematic structural diagram of the transmission part of the present invention;

[0031] Figure 10 This is a schematic diagram of the specific structure of the lifting support mechanism of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of the stabilizing seat of the present invention;

[0033] Figure 12 This is a schematic diagram of the specific structure of the oblique downward pressing mechanism of the present invention;

[0034] Figure 13 This is a schematic diagram of the specific structure of the transverse pipe pushing mechanism of the present invention;

[0035] Figure 14 This is a schematic diagram of the guide rail and slider assembly structure of the present invention;

[0036] Figure 15 This is a schematic diagram of the specific structure of the vertical pipe rotating mechanism of the present invention;

[0037] Figure 16 This is a schematic diagram of the laser welding gun installation structure of the present invention;

[0038] In the figure: 1. table, 2. first upright table, 3. second upright table, 4. flip frame, 5. first rotating shaft, 6. reciprocating transmission mechanism, 601. upright plate, 602. second rotating shaft, 603. third rotating shaft, 604. first gear plate, 605. second gear plate, 606. first transmission plate, 607. second transmission plate, 608. third transmission plate, 609. first servo motor, 610. shaft seat, 611. connecting shaft, 612. first circular plate, 613. second circular plate, 614. belt strip, 615. first arc groove, 616. second arc groove, 617. first Three arc-shaped grooves, 618. Transmission part, 619. First arc-shaped convex surface, 620. Second arc-shaped convex surface, 621. Arc-shaped concave surface, 622. First strip groove, 623. Second strip groove, 624. Protrusion, 625. Round rod, 7. Lifting support mechanism, 701. First mounting plate, 702. First guide rod cylinder, 703. Mounting seat, 704. Stable seat, 705. Fourth arc-shaped groove, 706. Ball, 8. Nuclear power heat exchanger heat transfer tube, 9. Oblique downward pressing mechanism, 901. First base, 902. First base, 903. First pen-shaped cylinder, 904. Push Plate, 905. Second base, 906. Third base, 907. Second guide rod cylinder, 908. First rubber block, 10. Horizontal tube push mechanism, 10. Fourth base, 1002. Second pen-shaped cylinder, 1003. Fifth base, 1004. Adapter plate, 1005. First receiving block, 1006. Second base, 1007. First push rod, 1008. Third pen-shaped cylinder, 1009. Second receiving block, 1010. Second push rod, 11. Gantry, 12. Vertical tube rotation mechanism, 1201. Electric rail, 1202. Second servo motor, 1203. First adjustment seat , 1204. Second adjustment seat, 1205. Fifth pen-shaped cylinder, 1206. Sixth pen-shaped cylinder, 1207. Third receiving block, 1208. Fourth receiving block, 1209. Second rubber block, 1210. Third rubber block, 13. Third stand, 14. Support beam, 15. Welding gun bracket, 16. Laser welding gun, 17. Turntable, 18. Support seat, 19. Support table, 20. Sixth base, 21. Guide rail, 22. Fourth pen-shaped cylinder, 23. Slider, 24. Screw slide, 25. Third servo motor, 26. Assembly plate, 27. Cross bar, 28. Industrial 3D camera. DETAILED DESCRIPTION

[0039] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below 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 work are within the scope of protection of the present invention.

[0040] This specific embodiment provides a transverse seam welding device for nuclear power heat exchangers, such as Figures 1-16 As shown; it includes a table top 1, which is the bottom structure of the entire device. The table top 1 can be used to support other structures of the device, thereby integrating other structures of the device on the table top 1; and the table top 1 limits the processing area for transverse seam welding operations, thereby avoiding safety risks caused by tool placement or accidental entry of personnel.

[0041] A first stand 2 and a second stand 3 are fixedly mounted on the platform 1. The first stand 2 and the second stand 3 are symmetrically arranged at the left and right ends of the platform 1. A shaft collar seat is provided on the top of each of the first and second stands 2 and 3. A turntable 17 is provided on the inner side of each of the two shaft collar seats. The outer ends of the two turntables 17 are respectively rotatably engaged with their corresponding shaft collar seats. A support seat 18 is fixedly mounted on the disk surface of the inner ends of the two turntables 17. A turning frame 4 is installed between the two support seats 18. The bottom of the turning frame 4 is tightly connected to the two support seats 18, so that the turning frame 4 is arranged between the first stand 2 and the second stand 3, so that the turning frame 4 can be turned between the first stand 2 and the second stand 3.

[0042] A first rotating shaft 5 is rotatably mounted within the collar seat on the first stand 2. The end of the first rotating shaft 5 near the second stand 3 is securely connected to a turntable 17, thereby driving the turntable 17 to rotate. The outer end of the first rotating shaft 5 near the second stand 3 is in transmission connection with a reciprocating transmission mechanism 6. A support platform 19 is provided on the side of the first stand 2 away from the second stand 3, and the reciprocating transmission mechanism 6 is arranged on the support platform 19. The reciprocating transmission mechanism 6 includes a vertical plate 601, the bottom of which is securely connected to the support platform 19. The end of the first rotating shaft 5 is in rotational engagement with the vertical plate 601. The second rotating shaft 602 and the third rotating shaft 603 are rotatably installed in the upright plate 601; the peripheries of the second rotating shaft 602 and the third rotating shaft 603 are respectively fastened with a first gear disc 604 and a second gear disc 605, and the first gear disc 604 and the second gear disc 605 are both arranged on the side of the upright plate 601 close to the second stand 3, and the first servo motor 609 and the shaft seat 610 are fixedly installed on the support platform 19, and the shaft seats 610 are provided with two and are arranged symmetrically, and a connecting shaft 611 is rotatably installed between the two shaft seats 610, and the connecting shaft 61 One end extends out of the shaft seat 610 and is connected to the second rotating shaft 602 via a coupling. A first disc 612 is securely mounted on the periphery of the output shaft of the first servo motor 609, and a second disc 613 is securely mounted on the periphery of the connecting shaft 611. The diameter of the first disc 612 is smaller than that of the second disc 613. A transmission belt 614 is mounted between the first and second discs 612, 613. This allows the first servo motor 609, driven by the connecting shaft 611, to rotate the second rotating shaft 602, driving the first gear disc 604. The first gear disc 604 meshes with the second gear disc 605 for transmission. A first transmission disc 606 is mounted on the periphery of the first rotating shaft 5. A second transmission disc 607 and a third transmission disc 608 are fixed to the outer sides of the first and second gear discs 604, 605, respectively, via locking bolts.

[0043] Figure 7 It is the initial state before the whole device is put into operation. Figure 7 Take as an example and combine Figure 8 、 Figure 9As can be seen, the first transmission disc 606 is provided with a first arcuate groove 615, a second arcuate groove 616, and a third arcuate groove 617 on the upper, lower, and right sides, respectively. The inner curvature of the first arcuate groove 615, the second arcuate groove 616, and the third arcuate groove 617 are all the same. The second transmission disc 607 and the third transmission disc 608 are both provided with a transmission portion 618, which is arranged outside the main structure of the second transmission disc 607 and the third transmission disc 608 and is an integral structure therewith. Taking the second transmission disc 607 as an example, the transmission portion 618 is provided with a first arcuate convex surface 619, a second arcuate convex surface 620, and an arcuate concave surface 621. The first arcuate convex surface 619 and the second arcuate convex surface 620 are both arranged at the end close to the outer peripheral wall of the second transmission disc 607, and the arcuate concave surface 621 is arranged on the inner side of the first arcuate convex surface 619 and the second arcuate convex surface 620; the first arcuate convex surface 619 and the second arcuate convex surface 620 are both arranged at the inner side of the first arcuate convex surface 619 and the second arcuate convex surface 620. The first arc-shaped grooves 615 have the same arc size, and the arc size of the arc-shaped concave surface 621 is larger than the first arc-shaped groove 615. The first arc-shaped convex surface 619 and the second arc-shaped convex surface 620 both contact and slide with the inner groove surfaces of the first arc-shaped groove 615, the second arc-shaped groove 616, and the third arc-shaped groove 617; because the arc size of the arc-shaped concave surface 621 is larger than the first arc-shaped groove 615, the first transmission plate 606 avoids contact with the transmission part 618.

[0044] A first strip groove 622 is provided between the first arc-shaped groove 615 and the third arc-shaped groove 617, and a second strip groove 623 is provided between the second arc-shaped groove 616 and the third arc-shaped groove 617. One end of each of the first strip groove 622 and the second strip groove 623 is close to the first rotation axis 5, and the other end of each of the first strip groove 622 and the second strip groove 623 is open, so that the angle between the first strip groove 622 and the second strip groove 623 is 90°. The second transmission disk 607 and the third transmission disk 608 are both provided with protrusions 624. Taking the second transmission disk 607 as an example, the protrusions 624 are arranged outside the notch of the arc-shaped concave surface 621. Round rods 625 are fixedly mounted on both protrusions 624, and the outer peripheral wall of the round rods 625 can slide with the inner groove wall of the first strip groove 622 and the second strip groove 623. When the first transmission plate 606 rotates, the two round rods 625 can enter the first strip groove 622 and the second strip groove 623 respectively, so that the first transmission plate 606 is turned 90 degrees clockwise and then turned 90 degrees counterclockwise, so that the first rotating shaft 5 drives the turning frame 4 to rotate back and forth 90 degrees.

[0045] like Figure 2 、 Figure 3 、 Figure 10 、 Figure 11As shown, multiple symmetrically arranged lifting support mechanisms 7 are fixedly installed within the flip frame 4. The lifting support mechanisms 7 include a first mounting plate 701, the center of which is arranged inside the flip frame 4. Both sides of the first mounting plate 701 are arranged at the bottom of the flip frame 4 and are fastened thereto. The first mounting plates 701 are arranged at equal intervals. A vertically arranged first guide rod cylinder 702 is fixedly installed on the outer side of the center of each first mounting plate 701. The piston rod end of the first guide rod cylinder 702 is arranged vertically upward. The end of the piston rod of the first guide rod cylinder 702 is fixedly provided with a mounting seat 703. The mounting seat 703 is fixedly provided with a stabilizing seat 704. The stabilizing seat 704 has a fourth arcuate groove 705 formed therein. The fourth arcuate groove 705 has multiple spherical grooves formed therein. Multiple balls 706 are rotatably mounted in each spherical groove. The outer wall of the ball 706 slides with the inner wall of the spherical groove. Each stabilizing seat 704 stably supports two nuclear power heat exchanger heat transfer tubes 8. The two nuclear power heat exchanger heat transfer tubes 8 are symmetrically arranged above the flip frame 4, and the outer wall of the ball 706 is in sliding contact with the outer peripheral wall of the nuclear power heat exchanger heat transfer tube 8.

[0046] like Figure 2 、 Figure 3 、 Figure 12 As shown, a plurality of staggered oblique downward pressing mechanisms 9 are installed on the front and rear sides of the flip frame 4. The oblique downward pressing mechanism 9 includes a first base 901, the bottom of which is a right-angle structure, and the bottom end of each first base 901 is fastened to the side and top of the flip frame 4; a first base 902 is fixedly installed on the side of the first base 901, and a first pen-shaped cylinder 903 is hingedly installed on the first base 902. Figure 12For the initial position of the oblique downward pressing mechanism 9, the first pen-shaped cylinder 903 is arranged vertically, the piston rod end of the first pen-shaped cylinder 903 is vertically facing upward, and the piston rod end of the first pen-shaped cylinder 903 is hingedly installed with a push plate 904 through a pin shaft, and the push plate 904 is an H-shaped structure. A second base 905 and a third base 906 are fixedly installed on the top of the first base 901. The second base 905 is arranged on the side close to the first pen-shaped cylinder 903. One end of the bottom of the push plate 904 is hinged to the second base 905 through a pin shaft, and the other end of the bottom of the push plate 904 is in contact with the third base 906; a second guide rod cylinder 907 is fixedly installed on the side of the push plate 904. The second guide rod cylinder 907 is arranged horizontally with its piston rod end facing the nuclear power heat exchanger heat transfer pipe 8. The piston rod end of the second guide rod cylinder 907 is fixedly installed with a first rubber block 908, and the first rubber block 908 can be in contact with the outer peripheral wall of the nuclear power heat exchanger heat transfer pipe 8. By setting up the first pen-shaped cylinder 903, the push plate 904 can be pushed to gradually tilt downward and approach the nuclear power heat exchanger heat transfer tube 8, and under the action of the second guide rod cylinder 907, the first rubber block 908 is pressed against the outer wall of the nuclear power heat exchanger heat transfer tube 8, thereby stably pressing the two nuclear power heat exchanger heat transfer tubes 8 inside the fourth arc-shaped groove 705 of the stabilizing seat 704.

[0047] like Figure 2 、 Figure 3 、 Figure 13As shown, two symmetrically arranged transverse tube pushing mechanisms 10 are fixedly installed on the left and right ends of the flip frame 4, respectively, and the two transverse tube pushing mechanisms 10 are respectively close to the first stand 2 and the second stand 3. The transverse tube pushing mechanism 10 includes a fourth base 1001, which is fastened to the bottom of the flip frame 4. A second pen-shaped cylinder 1002 arranged vertically is hingedly mounted on the fourth base 1001. This vertical arrangement is the initial state of the second pen-shaped cylinder 1002. A fifth base 1003 is fixedly mounted on the flip frame 4. The fifth base 1003 is arranged above the fourth base 1001. A receiving plate 1004 is hingedly mounted on the fifth base 1003. A first receiving block 1005 is hingedly mounted on the end of the piston rod of the second pen-shaped cylinder 1002. The first receiving block 1005 is fastened to the side of the receiving plate 1004. A second base 1006 is fixedly installed on the receiving plate 1004, a first push rod 1007 is fixedly installed on the inner side of the second base 1006, a third pen-shaped cylinder 1008 is hingedly installed on the top of the second base 1006, and the horizontal arrangement is the initial state of the third pen-shaped cylinder 1008, a second receiving block 1009 is hingedly installed on the end of the third pen-shaped cylinder 1008, a second push rod 1010 is fixedly installed on the inner side of the second receiving block 1009, and the inner plate surfaces of the first push rod 1007 and the second push rod 1010 can both contact the outer end of the heat transfer tube 8 of the nuclear power heat exchanger. Driven by the second pen-shaped cylinder 1002 and the third pen-shaped cylinder 1008, the first push rod 1007 and the second push rod 1010 can push the nuclear power heat exchanger heat transfer tube 8 laterally, thereby gradually reducing the distance between the two nuclear power heat exchanger heat transfer tubes 8 until the inner ends of the two nuclear power heat exchanger heat transfer tubes 8 are completely in contact.

[0048] like Figure 2 、 Figure 3 、 Figure 14 As shown, a sixth base 20 and a guide rail 21 are fixedly mounted on the turning frame 4. One sixth base 20 and guide rail 21 form a set. In this specific embodiment, four sets are provided on the turning frame 4, and are arranged at the four corners of the top of the turning frame 4. Each sixth base 20 is fixedly mounted with a horizontally arranged fourth pen-shaped cylinder 22, with the piston rod end faces facing the inside of the turning frame 4. The guide rail 21 is mounted with a matching slider 23. The turning frame 4 is provided with two gantries 11, which are respectively arranged at the left and right ends of the turning frame 4. The two sliders 23 on the same side are fastened to the bottom ends of the gantries 11. The piston rod ends of the fourth pen-shaped cylinders 22 are fastened to the sides of the gantries 11, so that the fourth pen-shaped cylinders 22 can drive the gantries 11 to slide along the guide rails 21, thereby facilitating adjustment of the arrangement of the gantries 11.

[0049] like Figure 15 As shown, a vertical tube rotating mechanism 12 is mounted on the gantry 11. The vertical tube rotating mechanism 12 includes an electric rail 1201 fixedly mounted on the inner side of the top of the gantry 11. The electric rail 1201 is arranged horizontally and perpendicular to the turning frame 4. A second servo motor 1202 for driving the electric rail 1201 is fixedly mounted on the outer side of the top of the gantry 11. The second servo motor 1202 is used to provide driving force to the electric rail 1201. The first adjustment seat 1203 and the second adjustment seat 1204 are slidably mounted on the electric rail 1201, and the first adjustment seat 1203 and the second adjustment seat 1204 can be adjusted in distance under the action of the electric rail 1201; the first adjustment seat 1203 and the second adjustment seat 1204 are respectively fixedly mounted with a vertically arranged fifth pen-shaped cylinder 1205 and a sixth pen-shaped cylinder 1206, and the piston rod ends of the fifth pen-shaped cylinder 1205 and the sixth pen-shaped cylinder 1206 are both vertically downwardly arranged; the stroke directions of the piston rods of the fifth pen-shaped cylinder 1205 and the sixth pen-shaped cylinder 1206 are set in opposite directions, for example: the fifth pen-shaped cylinder 1205 drives its piston rod to move vertically downward, and the sixth pen-shaped cylinder 1206 is 206 will drive its piston rod to move vertically upward; the piston rod ends of the fifth pen-shaped cylinder 1205 and the sixth pen-shaped cylinder 1206 are respectively fixedly installed with the third receiving block 1207 and the fourth receiving block 1208, and the inner sides of the third receiving block 1207 and the fourth receiving block 1208 are respectively fixedly installed with the second rubber block 1209 and the third rubber block 1210, and the second rubber block 1209 and the third rubber block 1210 can both contact the outer peripheral wall of the nuclear power heat exchanger heat transfer tube 8, and under the action of the fifth pen-shaped cylinder 1205 and the sixth pen-shaped cylinder 1206 set in the opposite direction of the piston rod stroke, the nuclear power heat exchanger heat transfer tube 8 is vertically rotated 180°, thereby turning over the two nuclear power heat exchanger heat transfer tubes 8.

[0050] like Figure 1 、 Figure 16As shown, a third stand 13 is fixedly mounted on the table 1, and the third stand 13 is arranged at the rear side of the flip frame 4. Four support beams 14 are fixedly mounted on the side of the third stand 13 close to the flip frame 4. The four support beams 14 are grouped in pairs and are all arranged above the flip frame 4. A vertically arranged lead screw slide 24 is fixedly mounted on the outside of the support beam 14, and a third servo motor 25 for driving the lead screw end of the lead screw slide 24 is fixedly mounted on the top of the lead screw slide 24. The output shaft of the third servo motor 25 is connected to the lead screw transmission in the lead screw slide 24 through a coupling, thereby causing it to rotate; a sliding end connected to its lead screw transmission is provided on the outside of the lead screw slide 24, and the sliding end can be adjusted in vertical height under the drive of the three servo motors 25; an assembly plate 26 is fixedly mounted on the above-mentioned sliding end, and the assembly plate 26 is fixedly mounted on the assembly plate 26 A welding gun bracket 15 is fastened to it, and a cross bar 27 fastened to the assembly plate 26 is provided on the side of the welding gun bracket 15. The cross bar 27 is arranged horizontally, and an industrial 3D camera 28 with adjustable position is installed on the cross bar 27; a vertically arranged laser welding gun 16 is fixedly installed in the welding gun bracket 15, and the welding head of the laser welding gun 16 is facing the heat transfer tube 8 of the nuclear power heat exchanger. The industrial 3D camera 28 is facing the welding head of the laser welding gun 16, and its real-time image is fed back to the central control terminal when the welding head of the laser welding gun 16 is performing welding operations.

[0051] The working principle of the present invention is:

[0052] During the production and processing of nuclear power equipment, the processing personnel can drive a forklift to place two nuclear power heat exchanger heat transfer tubes 8 from the front side of the table 1 into the turning frame 4, and the nuclear power heat exchanger heat transfer tubes 8 can be stably supported by the stabilizing seat 704.

[0053] First, the height of the two nuclear power heat exchanger heat transfer tubes 8 is adjusted by the lifting support mechanism 7. Specifically, the height of the stabilizing seat 704 is precisely adjusted by the first guide rod cylinder 702 to ensure that the height of the two nuclear power heat exchanger heat transfer tubes 8 meets the processing requirements.

[0054] Next, two transverse tube-pushing mechanisms 10 push the two nuclear power heat exchanger heat transfer tubes 8, respectively, reducing the distance between them until the inner ends of the two nuclear power heat exchanger heat transfer tubes 8 are completely in contact. Specifically, the second pen-shaped cylinder 1002 pushes the receiving plate 1004 to rotate inward on the fifth base 1003; simultaneously, the third pen-shaped cylinder 1008 pushes the second receiving block 1009 to rotate. At this point, the first push rod 1007 and the second push rod 1010 both apply a transverse force to the nuclear power heat exchanger heat transfer tube 8 on that side. Because multiple balls 706 are rotatably mounted within the fourth arcuate groove 705, the two nuclear power heat exchanger heat transfer tubes 8 are gradually brought closer together, and the edges of their inner contacting tube surfaces form the transverse seam to be welded.

[0055] Furthermore, the oblique downward pressing mechanism 9 secures the two nuclear power heat exchanger heat transfer tubes 8 to the turning frame 4. Specifically, driven by the first pen-shaped cylinder 903, the push plate 904 gradually tilts downward and approaches the nuclear power heat exchanger heat transfer tubes 8. Simultaneously, driven by the second guide rod cylinder 907, the first rubber block 908 is pressed against the outer wall of the nuclear power heat exchanger heat transfer tubes 8, thereby stably pressing the two nuclear power heat exchanger heat transfer tubes 8 into the fourth arc-shaped groove 705 of the stabilizing seat 704.

[0056] By controlling the third servo motor 25, the height of the assembly plate 26 is adjusted, causing the welding head of the laser welding gun 16 to gradually descend vertically until it contacts the transverse seam between the two nuclear power heat exchanger heat transfer tubes 8. By controlling the first servo motor 609 to rotate forward, the first gear disc 604 engages with the second gear disc 605, causing the second transmission disc 607 to rotate counterclockwise while the third transmission disc 608 rotates clockwise. The second arcuate convex surface 620 of the transmission portion 618 provided on the second transmission disc 607 slides with the third arcuate groove 617, causing the round rod 625 on the second transmission disc 607 to enter the first strip groove 622, thereby driving the first transmission disc 606 to rotate 90° clockwise. Subsequently, the round rod 625 on the third transmission disc 608 enters the second strip groove 623, thereby driving the first transmission disc 606 to rotate 90° counterclockwise. This process can be repeated. At the same time, the reciprocating drive mechanism 6 drives the turning frame 4 to rotate 90 degrees, allowing the laser welding gun 16 to weld a quarter of the transverse seam multiple times. After the welding standard for this quarter of the transverse seam is met, the first servo motor 609 is rotated in the reverse direction to weld the other quarter of the transverse seam on the upper half of the two nuclear power heat exchanger heat transfer tubes 8.

[0057] Finally, by controlling the oblique downward pressing mechanism 9 and the horizontal tube pushing mechanism 10, the stable clamping of the two nuclear power heat exchanger heat transfer tubes 8 is released, and the two nuclear power heat exchanger heat transfer tubes 8 are vertically rotated 180° through the vertical tube rotating mechanism 12, so that the lower half of the two nuclear power heat exchanger heat transfer tubes 8 face the laser welding gun 16. Specifically: by controlling the fifth pen-shaped cylinder 1205 and the sixth pen-shaped cylinder 1206, the second rubber block 1209 is arranged on the lower half side of the nuclear power heat exchanger heat transfer tube 8, and the third rubber block 1210 is arranged on the upper half side of the nuclear power heat exchanger heat transfer tube 8, and by controlling the second servo motor 1202, the distance between the second rubber block 1209 and the third rubber block 1210 is adjusted so that they are close to the outer wall of the nuclear power heat exchanger heat transfer tube 8; by making the second rubber block 1209 and the third rubber block 1210 move vertically upward and vertically downward at the same time, the nuclear power heat exchanger heat transfer tube 8 is vertically rotated 180°, so that the lower half sides of the two nuclear power heat exchanger heat transfer tubes 8 face the laser welding gun 16, and the laser welding gun 16 is used to weld the remaining half of the transverse seam.

[0058] Compared with the prior art, the present invention offers the following advantages: First, by providing a reversing frame capable of 90° reciprocating rotation, the present invention replaces the multi-torch layout used in the prior art. Through the coordinated operation of the first servo motor 609 and the fifth and sixth pen-shaped cylinders 1205 and 1206, the nuclear power heat exchanger heat transfer tube 8 can be precisely rotated four times at different angles, completely avoiding the molten pool disturbance caused by superimposed heat input, thereby ensuring that the transverse seam welding quality meets production standards. Second, the lifting support mechanism 7, the oblique downward pressure mechanism 9, and the transverse tube pushing mechanism 10 achieve "zero gap" (less than 0.05mm) butt joints between two nuclear power heat exchanger heat transfer tubes 8, while simultaneously applying uniform pressure to eliminate manual positioning errors. Furthermore, the reciprocating drive mechanism 6 and the vertical tube rotating mechanism 12 effectively eliminate blind spots in the annular transverse seam, further improving positioning accuracy. This not only enhances welding quality but also significantly reduces welding time. In summary, the present invention eliminates residual stress concentration and the causes of SGTR accidents from the root, achieving safe production and safe application; therefore, the invention has very broad application prospects.

[0059] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transverse seam welding device for a nuclear power heat exchanger, comprising a platen (1), characterized in that: A first stand (2) and a second stand (3) are fixedly mounted on the table plate (1); a turning frame (4) is rotatably mounted between the first stand (2) and the second stand (3); a first rotating shaft (5) is rotatably mounted on the first stand (2); the outer end of the first rotating shaft (5) is connected to a reciprocating transmission mechanism (6); the reciprocating transmission mechanism (6) is used to rotate the turning frame (4) by 90°; a plurality of symmetrically arranged lifting support mechanisms (7) are fixedly mounted inside the turning frame (4); the lifting support mechanisms (7) are used to stably support two nuclear power heat exchanger heat transfer tubes (8) and to adjust the lifting and lowering thereof; a plurality of staggered oblique downward pressing mechanisms (9) are mounted on both sides of the turning frame (4); the oblique downward pressing mechanisms (9) are used to stably press the two nuclear power heat exchanger heat transfer tubes (8); two symmetrically arranged transverse tube pushing mechanisms (10) are fixedly mounted at both ends of the turning frame (4); the two transverse tube pushing mechanisms (10) Used to push two nuclear power heat exchanger heat transfer tubes (8) and reduce the distance between them, the periphery of the two horizontal tube pushing mechanisms (10) are both provided with a gantry (11), the gantry (11) is arranged above the flip frame (4) and slidably cooperates with it, the gantry (11) is installed with a vertical tube rotating mechanism (12), the vertical tube rotating mechanism (12) is used to vertically rotate the nuclear power heat exchanger heat transfer tube (8) by 180 degrees, and the platform (1) is fixedly installed with a third stand (13) The third stand (13) is arranged at the rear side of the flip frame (4), and a support beam (14) arranged above the flip frame (4) is fixedly installed on the side of the third stand (13). A vertically lifting welding gun bracket (15) is provided on the outer side of the support beam (14). A vertically arranged laser welding gun (16) is fixedly installed in the welding gun bracket (15). The laser welding gun (16) is used to perform welding operations on the transverse seams where two nuclear power heat exchanger heat transfer tubes (8) are in contact.

2. A transverse seam welding device for a nuclear power heat exchanger according to claim 1, characterized in that: The inner sides of the first stand (2) and the second stand (3) are both provided with a rotating disc (17) that is rotatably matched, and a support seat (18) is fixedly installed on the inner disc surface of the turntable (17), and the support seat (18) is fastened to the bottom of the flip frame (4); a support platform (19) is provided on the side of the first stand (2), and the reciprocating transmission mechanism (6) includes a vertical plate (601) that is fastened to the support platform (19), and the vertical plate (601) is rotatably matched with the first rotating shaft (5), and a second rotating shaft (602) and a third rotating shaft (603) are rotatably installed in the vertical plate (601); the outer peripheries of the second rotating shaft (602) and the third rotating shaft (603) are fastened with a first gear disc (604) and a second gear disc (605), respectively, and the first gear disc (604) and the second gear disc (605) are meshed for transmission, and the first rotating shaft (5) The first transmission disc (606) is mounted on the periphery of the first toothed disc (604) and the second toothed disc (605), respectively, with a second transmission disc (607) and a third transmission disc (608) fixedly mounted on the outer sides thereof; the first transmission disc (606) is in transmission cooperation with the second transmission disc (607) and the third transmission disc (608); a first servo motor (609) and an axle seat (610) are fixedly mounted on the support platform (19); a connecting shaft (611) is rotatably mounted on the axle seat (610); the connecting shaft (611) is connected to the second rotating shaft (602); a first disc (612) is fastened around the output shaft of the first servo motor (609); a second disc (613) is fastened around the connecting shaft (611); a belt strip (614) for transmission is mounted between the first disc (612) and the second disc (613).

3. A transverse seam welding device for a nuclear power heat exchanger according to claim 2, characterized in that: The first transmission disc (606) is provided with a first arc-shaped groove (615), a second arc-shaped groove (616), and a third arc-shaped groove (617) having the same arc, respectively, on the upper, lower, and right sides. The second transmission disc (607) and the third transmission disc (608) are both provided with a transmission part (618). The transmission part (618) is provided with a first arc-shaped convex surface (619), a second arc-shaped convex surface (620), and an arc-shaped concave surface (621). The first arc-shaped convex surface (619) and the second arc-shaped convex surface (620) have the same arc size as the first arc-shaped groove (615). The arc size of the arc-shaped concave surface (621) is larger than that of the first arc-shaped groove (615). The first arc-shaped convex surface (619) and the second arc-shaped convex surface (620) are both in contact and sliding with the inner groove surfaces of the first arc-shaped groove (615), the second arc-shaped groove (616), and the third arc-shaped groove (617).

4. A transverse seam welding device for a nuclear power heat exchanger according to claim 3, characterized in that: A first strip groove (622) is provided between the first arc groove (615) and the third arc groove (617), and a second strip groove (623) is provided between the second arc groove (616) and the third arc groove (617). The angle between the first strip groove (622) and the second strip groove (623) is 90°. The second transmission disk (607) and the third transmission disk (608) are both provided with protrusions (624). Round rods (625) are fixedly mounted on the two protrusions (624). The outer peripheral wall of the round rod (625) can be slidably matched with the inner groove wall of the first strip groove (622) and the second strip groove (623).

5. The transverse seam welding device for a nuclear power heat exchanger according to claim 1, characterized in that: The lifting support mechanism (7) includes a first mounting plate (701) fastened to the turning frame (4), a first vertically arranged guide rod cylinder (702) is fixedly mounted on the first mounting plate (701), a mounting seat (703) is fixedly provided at the end of the piston rod of the first guide rod cylinder (702), a stabilizing seat (704) is fixedly provided on the mounting seat (703), a fourth arc-shaped groove (705) is provided on the stabilizing seat (704), a plurality of balls (706) are rotatably mounted in the fourth arc-shaped groove (705), and the outer wall of the balls (706) is in sliding contact with the outer peripheral wall of the heat transfer tube (8) of the nuclear power heat exchanger.

6. The transverse seam welding device for a nuclear power heat exchanger according to claim 1, characterized in that: The oblique downward pressing mechanism (9) includes a first base (901) that is fastened to the flip frame (4), a first base (902) is fixedly installed on the side of the first base (901), a first pen-shaped cylinder (903) is hingedly installed on the first base (902), a push plate (904) is hingedly installed on the end of the piston rod of the first pen-shaped cylinder (903), a second base (905) and a third base (906) are fixedly installed on the top of the first base (901), one end of the bottom of the push plate (904) is hinged to the second base (905), and the other end of the bottom of the push plate (904) is in contact with the third base (906), a second guide rod cylinder (907) is fixedly installed on the side of the push plate (904), a first rubber block (908) is fixedly installed on the end of the piston rod of the second guide rod cylinder (907), and the first rubber block (908) can be in contact with the outer peripheral wall of the heat transfer tube (8) of the nuclear power heat exchanger.

7. The transverse seam welding device for a nuclear power heat exchanger according to claim 1, characterized in that: The transverse tube pushing mechanism (10) comprises a fourth base (1001) which is fastened to the turning frame (4); a second pen-shaped cylinder (1002) arranged vertically is hingedly mounted on the fourth base (1001); a fifth base (1003) is fixedly mounted on the turning frame (4); a receiving plate (1004) is hingedly mounted on the fifth base (1003); a first receiving block (1005) is hingedly mounted on the end of the piston rod of the second pen-shaped cylinder (1002); the first receiving block (1005) is fastened to the receiving plate (1004); the receiving plate (1004) is hingedly mounted on the end of the piston rod of the second pen-shaped cylinder (1002); 04), a second base (1006) is fixedly mounted on the inner side of the second base (1006), a first push rod (1007) is fixedly mounted on the inner side of the second base (1006), a third pen-shaped cylinder (1008) arranged horizontally is hingedly mounted on the top of the second base (1006), a second receiving block (1009) is hingedly mounted on the end of the third pen-shaped cylinder (1008), a second push rod (1010) is fixedly mounted on the inner side of the second receiving block (1009), and both the first push rod (1007) and the second push rod (1010) can contact the outer end of the heat transfer tube (8) of the nuclear power heat exchanger.

8. The transverse seam welding device for a nuclear power heat exchanger according to claim 1, characterized in that: A sixth base (20) and a guide rail (21) are fixedly mounted on the turning frame (4); a fourth pen-shaped cylinder (22) arranged horizontally is fixedly mounted on the sixth base (20); a matching slider (23) is mounted on the guide rail (21); the slider (23) is fastened to the bottom end of the gantry (11); and the piston rod end of the fourth pen-shaped cylinder (22) is fastened to the side of the gantry (11).

9. The transverse seam welding device for a nuclear power heat exchanger according to claim 1, characterized in that: The vertical pipe rotating mechanism (12) comprises an electric rail (1201) fixedly mounted on the inner side of the top of the gantry (11); a second servo motor (1202) for driving the electric rail (1201) is fixedly mounted on the outer side of the top of the gantry (11); a first adjustment seat (1203) and a second adjustment seat (1204) are slidably mounted on the electric rail (1201); a fifth pen-shaped cylinder (1205) and a sixth pen-shaped cylinder (1206) arranged vertically are fixedly mounted on the first adjustment seat (1203) and the second adjustment seat (1204), respectively; the fifth pen-shaped cylinder ( 1205) and the sixth pen-shaped cylinder (1206) have piston rod travel directions set in opposite directions, and the piston rod ends of the fifth pen-shaped cylinder (1205) and the sixth pen-shaped cylinder (1206) are respectively fixedly installed with a third receiving block (1207) and a fourth receiving block (1208), and the inner sides of the third receiving block (1207) and the fourth receiving block (1208) are respectively fixedly installed with a second rubber block (1209) and a third rubber block (1210), and the second rubber block (1209) and the third rubber block (1210) can both contact the outer peripheral wall of the heat transfer tube (8) of the nuclear power heat exchanger.

10. The transverse seam welding device for a nuclear power heat exchanger according to claim 1, characterized in that: A vertically arranged lead screw slide (24) is fixedly mounted on the outer side of the support beam (14), a third servo motor (25) for driving the lead screw end of the lead screw slide (24) is fixedly mounted on the top of the lead screw slide (24), an assembly plate (26) is fixedly mounted on the sliding end of the outer side of the lead screw slide (24), the assembly plate (26) is fastened to the welding gun bracket (15), a cross bar (27) fastened to the assembly plate (26) is provided on the side of the welding gun bracket (15), and an industrial 3D camera (28) with adjustable position is mounted on the cross bar (27).

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