A welding mechanism and operation method for metal fitting processing

Abstract

The present invention discloses a welding mechanism and an operation method for metal fitting processing, which relate to the technical field of welding processing. The welding mechanism includes a bottom bracket, a positioning and calibration component, a second clamping component, and an adjustment component. An adaptive slide rail is provided on one side of the bottom bracket, and two C-shaped welding mounting brackets are provided on the bottom bracket. One of the C-shaped welding mounting brackets is slidably arranged on the adaptive slide rail. A first clamping component is provided on the C-shaped welding mounting bracket. The two necked flanges are stably mounted respectively by the two C-shaped welding mounting brackets with the first clamping component. Then, through the positioning and calibration component, the several bolt docking holes of the two necked flanges are accurately aligned. Subsequently, the position of the combined pipe is adjusted by the second clamping component and the adjustment component. Then, with the assistance of the auxiliary reference plate and the laser transceiver, the accurate positioning of the combined pipe and the two necked flanges is realized, improving the welding operation efficiency and welding operation quality of the necked flange and the combined pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of welding processing, and specifically relates to a welding mechanism and an operation method for metal fitting processing. Background Art

[0002] Metal fittings refer to components made of metal materials and used in various equipment, machinery, structures, etc. They are widely used in many fields. In the field of high-pressure pipelines, a necked butt-welding flange type pipe joint is a common pipeline metal fitting;

[0003] At present, the existing necked butt-welding flange type pipe joints are mainly divided into two welding methods: manual welding and mechanical equipment welding during welding processing. The invention with the publication number CN103143814 A relates to a special equipment for circumferential welding of a steel pipe and a high-neck flange. It includes a platform, a console, and a welding device. After the steel pipe and the flange are placed on the fixed fixture, the welding head can be freely adjusted up and down, back and forth to find the center of the butt weld, and circumferential welding is performed. The inner and outer sides of the steel pipe can be welded in two times to form two circumferential welds inside and outside. When welding the inside of the steel pipe, the welding head extends into the steel pipe from the flange end, and the welding process is completely automated, with high welding production efficiency and stable welding quality. The above solution realizes the purpose of production efficiency through automatic control of welding. However, since the necked butt-welding flange type pipe joint is different from the butt-welding flange welding operation during welding, manual welding is time-consuming and laborious. Even when using mechanical automatic welding construction, it is often necessary to manually align and spot-weld the pipeline and the flange before welding, resulting in a certain misalignment deviation between the bolt connection holes or between the pipeline and the flange after welding of the necked butt-welding flange type pipe joint, affecting the cost quality and processing efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a welding mechanism and an operation method for metal fitting processing to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A welding mechanism and an operation method for metal fitting processing, including:

[0006] A bottom bracket, one side of the bottom bracket is provided with an adaptive slide rail, and two C-shaped welding mounting brackets are provided on the bottom bracket. One of the C-shaped welding mounting brackets is slidably arranged on the adaptive slide rail. A first clamping assembly is provided on the C-shaped welding mounting bracket. The first clamping assembly includes a bottom control wheel, a side supporting wheel, and a top clamping wheel, and a necked flange is clamped between the bottom control wheel, the side supporting wheel, and the top clamping wheel;

[0007] Positioning and calibration assembly, the positioning and calibration assembly is movably arranged on one side of the C-shaped welding mounting frame. The positioning and calibration assembly includes a side bracket, a storage and mounting box, and a protruding positioning rod. A number of bolt docking holes are opened on both of the necked flanges. Two protruding positioning rods are respectively inserted into one of the bolt docking holes of the two necked flanges, and laser transceivers are arranged on the opposite sides of the two protruding positioning rods.

[0008] Second clamping assembly, the second clamping assembly is arranged between the two C-shaped welding mounting frames on the bottom bracket through an adjustment assembly. The second clamping assembly includes a U-shaped movable frame and two clamping frames. The adjustment assembly includes a lifting control frame and a second telescopic cylinder, and a reference plate is arranged opposite to the protruding positioning rod at the center of the U-shaped movable frame.

[0009] Preferably, an embedding groove is opened at the lower end of the C-shaped welding mounting frame. The bottom control wheel is rotatably arranged in the embedding groove. The side supporting wheel is adjustably arranged on one side of the C-shaped welding mounting frame. A lifting clamping frame is horizontally arranged at the upper end of the C-shaped welding mounting frame. The top clamping wheel is rotatably arranged on one side of the lifting clamping frame. V-shaped positioning grooves are arranged on the bottom control wheel, the side supporting wheel and the top clamping wheel. Three sides of the necked flange are respectively inserted into the three V-shaped grooves, and the necked flange is located directly above the bottom control wheel.

[0010] Preferably, a groove is opened on one side of the C-shaped welding mounting frame. Adjusting key grooves are symmetrically opened on both sides in the groove. The side supporting wheel is placed in the groove. The center of the side supporting wheel is inserted with an adjusting screw through a bearing rotating rod. Both sides of the adjusting screw respectively pass through the two adjusting screws movably and are fixed by nuts.

[0011] Preferably, a first adaptation groove is opened at the upper end of the side bracket. The storage and mounting box is horizontally arranged in the first adaptation groove. A number of first guide rods are vertically and symmetrically arranged at the lower end of the storage and mounting box. The number of first guide rods are respectively movably arranged on the side bracket. A first telescopic cylinder is vertically arranged at the center of the lower end in the first adaptation groove, and the upper end of the first telescopic cylinder is connected to the lower end of the storage and mounting box.

[0012] Preferably, a square spring groove is opened in the storage and mounting box. One side of the protruding positioning rod is horizontally and movably inserted into the square spring groove and is provided with a constraint plate. A reset spring is sleeved on the side of the protruding positioning rod where the constraint plate is located in the square spring groove. The side of the protruding positioning rod away from the storage and mounting box is inserted into the bolt docking hole. The side of the protruding positioning rod inserted into the bolt docking hole is of a conical structure. A pushing screw is inserted through the thread on the side of the storage and mounting box away from the protruding positioning rod, and one side of the pushing screw abuts against the constraint plate.

[0013] Preferably, the lifting control frame is vertically arranged at the upper end of the bottom bracket. Vertical guide grooves are respectively formed at the upper ends of both sides of the lifting control frame. Both sides of the U-shaped movable frame horizontally penetrate through the two vertical guide grooves respectively. Second guide rods are vertically arranged at both lower ends of the U-shaped movable frame. The two second guide rods are vertically and movably inserted into the lifting control frame respectively. A pushing seat is arranged at the center of the U-shaped movable frame. A second telescopic cylinder is vertically arranged at the lower end inside the lifting control frame, and the upper end of the second telescopic cylinder is connected to the lower end of the pushing seat.

[0014] Preferably, horizontal sliding grooves are respectively formed at both upper ends of the U-shaped movable frame. Two horizontal sliding rods are horizontally arranged in each of the horizontal sliding grooves. Sliders are arranged at the lower ends of the clamping frames. The two sliders are respectively inserted into the two horizontal sliding grooves and movably sleeved on the two horizontal sliding rods. Third telescopic cylinders are arranged on one side of the U-shaped movable frame close to the clamping frames, and one side of each third telescopic cylinder is connected to one side of the corresponding clamping frame.

[0015] Preferably, two clamping rollers are horizontally and symmetrically arranged on the opposite sides of the two clamping frames through connecting ears. A combined pipe is horizontally clamped between the four clamping rollers of the two clamping frames. Both sides of the two combined pipes are respectively in contact with one side of the two necked flanges.

[0016] Preferably, a second adaptation groove is horizontally penetrated and formed at the upper end of the pushing seat of the U-shaped movable frame. A damping sliding groove is vertically formed at the center inside the second adaptation groove. A reference plate is vertically and movably inserted into the damping sliding groove. A fourth telescopic cylinder is vertically arranged at the center of the lower end inside the second adaptation groove, and the upper end of the fourth telescopic cylinder is connected to the lower end of the reference plate. A reference hole is formed at the center of the reference plate. When the laser transceiver corresponds to the reference hole, the virtual axis of the combined pipe is coaxial with the virtual axis of the necked flange.

[0017] An operation method for a welding mechanism used in metal fitting processing includes the following steps:

[0018] Step 1: Adjust the position of the side supporting wheel in the adjustment key groove according to the diameter of the necked flange, so that the necked flange is directly above the bottom control wheel. Then the top clamping wheel descends to perform anti-disengagement positioning on the necked flange.

[0019] Step 2: At this time, according to the length of the virtual axis of the necked flange from the virtual axis of the bolt docking hole, the first telescopic cylinder controls the storage and installation box to rise, so that the laser transceiver is on one side of the lowermost bolt docking hole. At this time, the threaded rotation of the pushing screw controls the extended positioning rod to insert into the bolt docking hole of the necked flange. During this period, if the bolt docking hole is not directly above the bottom control wheel, the bottom control wheel can be rotated to rotate the necked flange so that the bolt docking hole corresponds to the laser transceiver.

[0020] Step 3: When two laser transceivers are respectively inserted into the bolt docking holes of two necked flanges, several bolt docking holes of the two necked flanges are correspondingly arranged. Then, two third telescopic cylinders extend towards the clamping frame position, and the two clamping frames horizontally clamp the combined pipe through the clamping rollers. At this time, regardless of the diameter of the combined pipe, the virtual axis of the combined pipe clamped by the four clamping rollers is at a fixed position. At this time, if the length value of the virtual axis of the combined pipe from the reference hole is equal to the length of the distance between the virtual axis of the necked flange and the virtual axis of the bolt docking hole, and the reference hole corresponds to the laser transceiver, then the virtual axis of the combined pipe is coaxial with the virtual axis of the necked flange. When the necked flange is controlled by the C-shaped welding mounting frame on one side to move towards the necked flange on the other side, both sides of the combined pipe respectively abut against the two necked flanges, facilitating the next welding operation;

[0021] Step 4: The height adjustment of the combined pipe is controlled by the second telescopic cylinder. When the distance between the virtual axis of the necked flange and the virtual axis of the bolt docking hole changes, the fourth telescopic cylinder can control the reference plate to move up and down to adjust, so that the distance between the reference hole and the virtual axis of the combined pipe changes correspondingly. Therefore, when the light of the laser transceiver passes through the reference hole and is received by another laser transceiver, the welding positions of the combined pipe and the two necked flanges are determined, and then stable welding is carried out.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] Two C-shaped welding mounting frames with the first clamping components are used to stably install the two necked flanges respectively. Then, through the positioning and calibration component, several bolt docking holes of the two necked flanges are accurately aligned. Subsequently, the position of the combined pipe is adjusted by the second clamping component and the adjusting component. Then, with the assistance of the reference plate and the laser transceiver, the precise positioning of the combined pipe and the two necked flanges is realized, improving the welding operation efficiency and welding operation quality of the necked flange and the combined pipe. Description of the Drawings

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 For the present invention Figure 1 Schematic diagram of part A;

[0026] Figure 3 It is a partial side-cut structural schematic diagram of the present invention;

[0027] Figure 4 For the present invention Figure 3 Schematic diagram of part B;

[0028] Figure 5 It is a sectional view of the installation of the second clamping component of the present invention;

[0029] Figure 6 For the present invention Figure 5 Schematic diagram of part C;

[0030] Figure 7 For the present invention Figure 6 Schematic diagram of part D;

[0031] Figure 8 Schematic diagram of the structure of the first clamping assembly of the present invention;

[0032] Figure 9 For the present invention Figure 8 Schematic diagram of part E;

[0033] Figure 10 Schematic diagram of the structure of the second clamping assembly of the present invention;

[0034] Figure 11 For the present invention Figure 10 Schematic diagram of part F.

[0035] In the figure: bottom bracket 1, adaptive slide rail 2, C-shaped welding mounting bracket 3, bottom control wheel 4, side supporting wheel 5, top clamping wheel 6, adjustment keyway 7, adjustment screw 8, lifting clamping frame 9, necked flange 10, bolt docking hole 11, side bracket 12, storage mounting box 13, first guide rod 14, square spring groove 15, extending positioning rod 16, return spring 17, pushing screw 18, laser transceiver 19, lifting control frame 20, U-shaped movable frame 21, vertical guide groove 22, second guide rod 23, horizontal chute 24, horizontal slide rod 25, clamping frame 26, clamping roller 27, combined pipe 28, damping chute 30, reference plate 31, reference hole 32, first telescopic cylinder 33, second telescopic cylinder 34, third telescopic cylinder 35, fourth telescopic cylinder 36. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to the attached Figure 1-11 , and the following technical solutions are provided in this application.

[0038] Embodiment 1: A welding mechanism and operation method for metal fitting processing, including a bottom bracket 1. One side of the bottom bracket 1 is provided with an adaptive slide rail 2. There are two C-shaped welding mounting brackets 3 on the bottom bracket 1. One of the C-shaped welding mounting brackets 3 is slidably arranged on the adaptive slide rail 2. The C-shaped welding mounting bracket 3 is provided with a first clamping assembly. The first clamping assembly includes a bottom control wheel 4, a side supporting wheel 5 and a top clamping wheel 6. A necked flange 10 is clamped between the bottom control wheel 4, the side supporting wheel 5 and the top clamping wheel 6. An embedding groove is opened at the lower end of the C-shaped welding mounting bracket 3. The bottom control wheel 4 is rotatably arranged in the embedding groove. The side supporting wheel 5 is adjustably arranged on one side of the C-shaped welding mounting bracket 3. A lifting clamping bracket 9 is horizontally arranged at the upper end of the C-shaped welding mounting bracket 3. The top clamping wheel 6 is rotatably arranged on one side of the lifting clamping bracket 9. The bottom control wheel 4, the side supporting wheel 5 and the top clamping wheel 6 are all provided with V-shaped positioning grooves. Three sides of the necked flange 10 are respectively inserted into three V-shaped grooves. And the necked flange 10 is located directly above the bottom control wheel 4. The bottom control wheel 4 can be driven and controlled by a motor. When the bottom control wheel 4 rotates, the necked flange 10 can be controlled to rotate.

[0039] A groove is opened on one side of the C-shaped welding mounting bracket 3. Adjustment key grooves 7 are symmetrically opened on both sides in the groove. The side supporting wheel 5 is placed in the groove. The center of the side supporting wheel 5 is rotatably inserted with an adjustment screw 8 through a bearing rotating rod. Both sides of the adjustment screw 8 respectively pass through two adjustment screws 8 movably and are fixed by nuts. Through the adjustment of the adjustment key groove 7 and the adjustment screw 8, the position of the side supporting wheel 5 can be adjusted. Furthermore, according to the diameter of the necked flange 10, the necked flange 10 is made to be directly above the bottom control wheel 4. When the bottom control wheel 4, the side supporting wheel 5 and the top clamping wheel 6 respectively abut against the necked flange 10, the necked flange 10 maintains a stable vertical posture. The top clamping wheel 6 and the bottom control wheel 4 can be appropriately misaligned to keep the necked flange 10 stable.

[0040] A positioning and calibration component is provided to correspondingly adjust the bolt docking holes 11 of two necked flanges 10. The positioning and calibration component is movably arranged on one side of the C-shaped welding mounting frame 3. The positioning and calibration component includes a side bracket 12, a receiving and mounting box 13, and a protruding positioning rod 16. A plurality of bolt docking holes 11 are provided on both of the two necked flanges 10. The two protruding positioning rods 16 are respectively inserted into one of the bolt docking holes 11 of the two necked flanges 10. And on the opposite sides of the two protruding positioning rods 16, laser transceivers 19 are provided. A first adaptation groove is provided at the upper end of the side bracket 12. The receiving and mounting box 13 is horizontally arranged in the first adaptation groove. A plurality of first guide rods 14 are vertically and symmetrically arranged at the lower end of the receiving and mounting box 13. The plurality of first guide rods 14 are respectively movably arranged on the side bracket 12. A first telescopic cylinder 33 is vertically arranged at the center of the lower end in the first adaptation groove. And the upper end of the first telescopic cylinder 33 is connected to the lower end of the receiving and mounting box 13. The first telescopic cylinder 33 can adjust the up and down heights of the receiving and mounting box 13 and the protruding positioning rod 16;

[0041] Square spring grooves 15 are provided in the receiving and mounting box 13. One side of the protruding positioning rod 16 is horizontally and movably inserted into the square spring groove 15 and is provided with a restraint plate. A return spring 17 is sleeved on the side of the protruding positioning rod 16 where the restraint plate is located in the square spring groove 15. The side of the protruding positioning rod 16 away from the receiving and mounting box 13 is inserted into the bolt docking hole 11. The side of the protruding positioning rod 16 inserted into the bolt docking hole 11 is of a conical structure. A push screw 18 is inserted through the side of the receiving and mounting box 13 away from the protruding positioning rod 16 by means of threads. And one side of the push screw 18 abuts against the restraint plate. The push screw 18 can also be an electric telescopic rod to realize the automatic adjustment of the protruding positioning rod 16 inserted into the bolt docking hole 11. The laser transceiver 19 is located at the center of the protruding positioning rod 16.

[0042] A second clamping component is provided to clamp and laterally rotate and support the combined pipe 28. The second clamping component is arranged between the two C-shaped welding mounting frames 3 on the bottom bracket 1 through an adjusting component. The second clamping component includes a U-shaped movable frame 21 and two clamping frames 26. The adjusting component includes a lifting control frame 20 and a second telescopic cylinder 34. And a reference plate 31 is provided at the center of the U-shaped movable frame 21 opposite to the protruding positioning rod 16. The lifting control frame 20 is vertically arranged at the upper end of the bottom bracket 1. Vertical guide grooves 22 are provided at the upper ends of both sides of the lifting control frame 20. The two sides of the U-shaped movable frame 21 respectively horizontally penetrate through the two vertical guide grooves 22. Second guide rods 23 are vertically arranged at both sides of the lower end of the U-shaped movable frame 21. The two second guide rods 23 are respectively vertically and movably inserted into the lifting control frame 20. A push seat is provided at the center of the U-shaped movable frame 21. A second telescopic cylinder 34 is vertically arranged at the lower end in the lifting control frame 20. And the upper end of the second telescopic cylinder 34 is connected to the lower end of the push seat. The second telescopic cylinder 34 can adjust the up and down height of the U-shaped movable frame 21.

[0043] On both sides of the upper end of the U-shaped movable frame 21, horizontal sliding grooves 24 are provided. Inside each horizontal sliding groove 24, two horizontal sliding rods 25 are horizontally arranged. At the lower ends of the clamping frames 26, sliders are provided. The two sliders are respectively inserted into the two horizontal sliding grooves 24 and movably sleeved on the two horizontal sliding rods 25. On one side of the U-shaped movable frame 21 close to the clamping frame 26, a third telescopic cylinder 35 is provided, and one side of the third telescopic cylinder 35 is connected to one side of the clamping frame 26. On the opposite sides of the two clamping frames 26, two clamping rollers 27 are horizontally and symmetrically arranged through connecting ears. Between the four clamping rollers 27 of the two clamping frames 26, a combined pipe 28 is horizontally clamped. On both sides of the two combined pipes 28, they are respectively in contact with one side of the two necked flanges 10. During welding, a double-gun welding method can be adopted for synchronous welding. After fully welding a certain length between the combined pipe 28 and the necked flange 10, as the bottom control wheel 4 controls the rotation of the necked flange 10, the rotation control of the combined pipe 28 between the four clamping rollers 27 can be driven to achieve rapid welding. For the inside of the welding joint between the necked flange 10 and the combined pipe 28, a welding torch can be inserted through the side of the necked flange 10 for internal reinforcement welding to improve the connection quality between the combined pipe 28 and the necked flange 10.

[0044] Embodiment 2: On the basis of Embodiment 1, a second adaptation groove is horizontally penetrated and opened at the upper end of the pushing seat of the U-shaped movable frame 21. Inside the second adaptation groove, a damping sliding groove 30 is vertically opened at the center. The reference plate 31 is vertically and movably inserted into the damping sliding groove 30. At the center of the lower end inside the second adaptation groove, a fourth telescopic cylinder 36 is vertically provided. The upper end of the fourth telescopic cylinder 36 is connected to the lower end of the reference plate 31. A reference hole 32 is opened at the center of the reference plate 31. And when the laser transceiver 19 corresponds to the reference hole 32, the virtual axis of the combined pipe 28 is coaxial with the virtual axis of the necked flange 10. The two necked flanges 10 are pre-positioned correspondingly. At this time, the combined pipe 28 is located between the two necked flanges 10 and is accurately positioned.

[0045] An operation method for a welding mechanism used in metal fitting processing includes the following steps:

[0046] Step 1: Adjust the position of the side supporting wheel 5 in the adjustment key groove 7 according to the diameter of the necked flange 10 so that the necked flange 10 is directly above the bottom control wheel 4. Then the top clamping wheel 6 descends to perform anti-disengagement positioning on the necked flange 10.

[0047] Step 2: At this time, according to the length of the virtual axis of the necked flange 10 from the virtual axis of the bolt docking hole 11, the first telescopic cylinder 33 controls the storage installation box 13 to rise, so that the laser transceiver 19 is on one side of the lowermost bolt docking hole 11. At this time, the threaded rotation is used to push the screw rod 18 to control the extended positioning rod 16 to insert into the bolt docking hole 11 of the necked flange 10. During this period, if the bolt docking hole 11 is not directly above the bottom control wheel 4, the bottom control wheel 4 can be rotated to rotate the necked flange 10 so that the bolt docking hole 11 corresponds to the laser transceiver 19;

[0048] Step 3: When the two laser transceivers 19 are respectively inserted into the bolt docking holes 11 of the two necked flanges 10, the several bolt docking holes 11 of the two necked flanges 10 are correspondingly arranged. Then, the two third telescopic cylinders 35 extend towards the clamping frame 26, and the two clamping frames 26 horizontally clamp the combined pipe 28 through the clamping rollers 27. At this time, regardless of the diameter of the combined pipe 28, the virtual axis of the combined pipe 28 clamped by the four clamping rollers 27 is at a fixed position. At this time, if the length value of the virtual axis of the combined pipe 28 from the reference hole 32 is equal to the length of the virtual axis of the necked flange 10 from the virtual axis of the bolt docking hole 11, and the reference hole 32 corresponds to the laser transceiver 19, then the virtual axis of the combined pipe 28 is coaxial with the virtual axis of the necked flange 10. When the C-shaped welding installation frame 3 on one side controls the necked flange 10 to move towards the necked flange 10 on the other side, both sides of the combined pipe 28 respectively abut against the two necked flanges 10, which is convenient for the next welding operation;

[0049] Step 4: The height adjustment of the combined pipe 28 is controlled by the second telescopic cylinder 34. When the distance between the virtual axis of the necked flange 10 and the virtual axis of the bolt docking hole 11 changes, the fourth telescopic cylinder 36 can control the reference plate 31 to move up and down to adjust, so that the distance between the reference hole 32 and the virtual axis of the combined pipe 28 changes correspondingly. Therefore, when the light of the laser transceiver 19 passes through the reference hole 32 and is received by another laser transceiver 19, the welding positions of the combined pipe 28 and the two necked flanges 10 are determined, and then stable welding is carried out.

[0050] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding mechanism and operation method for metal fitting processing, characterized in that, Comprising: A bottom bracket (1), one side of the bottom bracket (1) is provided with an adaptive slide rail (2), two C-shaped welding mounting brackets (3) are provided on the bottom bracket (1), and one of the C-shaped welding mounting brackets (3) is slidably arranged on the adaptive slide rail (2). A first clamping assembly is provided on the C-shaped welding mounting bracket (3), and the first clamping assembly includes a bottom control wheel (4), a side supporting wheel (5) and a top clamping wheel (6), and a necked flange (10) is clamped between the bottom control wheel (4), the side supporting wheel (5) and the top clamping wheel (6); A positioning and calibration assembly, the positioning and calibration assembly is movably arranged on one side of the C-shaped welding mounting bracket (3), and the positioning and calibration assembly includes a side bracket (12), a storage mounting box (13) and a protruding positioning rod (16). A plurality of bolt docking holes (11) are opened on both of the two necked flanges (10), and the two protruding positioning rods (16) are respectively inserted into one of the bolt docking holes (11) of the two necked flanges (10), and laser transceivers (19) are arranged on the opposite sides of the two protruding positioning rods (16); A second clamping assembly, the second clamping assembly is arranged between the two C-shaped welding mounting brackets (3) on the bottom bracket (1) through an adjusting assembly. The second clamping assembly includes a U-shaped movable frame (21) and two clamping brackets (26), and the adjusting assembly includes a lifting control frame (20) and a second telescopic cylinder (34), and a reference plate (31) is arranged opposite to the protruding positioning rod (16) at the center of the U-shaped movable frame (21); The lifting control frame (20) is vertically arranged at the upper end of the bottom bracket (1). Vertical guide grooves (22) are opened at the upper ends of both sides of the lifting control frame (20). Both sides of the U-shaped movable frame (21) horizontally penetrate through the two vertical guide grooves (22). Second guide rods (23) are vertically arranged at both lower sides of the U-shaped movable frame (21), and the two second guide rods (23) are respectively vertically and movably inserted into the lifting control frame (20). A pushing seat is arranged at the center of the U-shaped movable frame (21). A second telescopic cylinder (34) is vertically arranged at the lower end inside the lifting control frame (20), and the upper end of the second telescopic cylinder (34) is connected to the lower end of the pushing seat; A second adaptation groove is horizontally opened at the upper end of the pushing seat of the U-shaped movable frame (21). A damping chute (30) is vertically opened at the center inside the second adaptation groove. The reference plate (31) is vertically and movably inserted into the damping chute (30). A fourth telescopic cylinder (36) is vertically arranged at the center of the lower end inside the second adaptation groove, and the upper end of the fourth telescopic cylinder (36) is connected to the lower end of the reference plate (31). A reference hole (32) is opened at the center of the reference plate (31), and when the laser transceiver (19) corresponds to the reference hole (32), the virtual axis of the combined pipe (28) is coaxial with the virtual axis of the necked flange (10).

2. A welding mechanism and operation method for metal fitting processing according to claim 1, characterized in that: The lower end of the C-shaped welding mounting bracket (3) is provided with an embedding groove, the bottom control wheel (4) is rotatably arranged in the embedding groove, the side supporting wheel (5) is adjustably arranged on one side of the C-shaped welding mounting bracket (3), the upper end of the C-shaped welding mounting bracket (3) is horizontally provided with a lifting clamping bracket (9), the top clamping wheel (6) is rotatably arranged on one side of the lifting clamping bracket (9), the bottom control wheel (4), the side supporting wheel (5) and the top clamping wheel (6) are all provided with V-shaped positioning grooves, three sides of the necked flange (10) are respectively inserted into the three V-shaped grooves, and the necked flange (10) is located directly above the bottom control wheel (4).

3. A welding mechanism and operation method for metal fitting processing according to claim 2, characterized in that: One side of the C-shaped welding mounting bracket (3) is provided with a groove, and adjustment key grooves (7) are symmetrically arranged on both sides in the groove. The side supporting wheel (5) is placed in the groove. The center of the side supporting wheel (5) is rotatably inserted with an adjustment screw rod (8) through a bearing rod. Both sides of the adjustment screw rod (8) respectively pass through the two adjustment screw rods (8) movably and are fixed by nuts.

4. A welding mechanism and operation method for metal fitting processing according to claim 3, characterized in that: The upper end of the side bracket (12) is provided with a first adaptation groove, the storage mounting box (13) is horizontally arranged in the first adaptation groove, a plurality of first guide rods (14) are vertically and symmetrically arranged at the lower end of the storage mounting box (13), and the plurality of first guide rods (14) are respectively movably arranged on the side bracket (12). The center of the lower end in the first adaptation groove is vertically provided with a first telescopic cylinder (33), and the upper end of the first telescopic cylinder (33) is connected to the lower end of the storage mounting box (13).

5. A welding mechanism and operation method for metal fitting processing according to claim 4, characterized in that: A square spring groove (15) is arranged in the storage mounting box (13). One side of the extended positioning rod (16) is horizontally and movably inserted into the square spring groove (15) and is provided with a restraint plate. A return spring (17) is sleeved on one side of the restraint plate where the extended positioning rod (16) is located in the square spring groove (15). The side of the extended positioning rod (16) far from the storage mounting box (13) is inserted into the bolt docking hole (11). The side of the extended positioning rod (16) inserted into the bolt docking hole (11) is of a conical structure. The side of the storage mounting box (13) far from the extended positioning rod (16) is threadedly inserted with a pushing screw rod (18), and one side of the pushing screw rod (18) abuts against the restraint plate.

6. A welding mechanism and operating method for metal fitting processing according to claim 5, characterized in that: Horizontal sliding grooves (24) are arranged on both sides of the upper end of the U-shaped movable frame (21). Two horizontal sliding rods (25) are horizontally arranged in each of the horizontal sliding grooves (24). Sliders are arranged at the lower ends of the clamping brackets (26). The two sliders are respectively inserted into the two horizontal sliding grooves (24) and are movably sleeved on the two horizontal sliding rods (25). A third telescopic cylinder (35) is arranged on one side of the U-shaped movable frame (21) close to the clamping bracket (26), and one side of the third telescopic cylinder (35) is connected to one side of the clamping bracket (26).

7. A welding mechanism and operation method for metal fitting processing according to claim 6, characterized in that: On the opposite sides of the two clamping brackets (26), two clamping rollers (27) are horizontally and symmetrically arranged through connecting ears. A combined pipe (28) is horizontally clamped between the four clamping rollers (27) of the two clamping brackets (26). Both sides of the two combined pipes (28) are respectively in contact with one side of the two necked flanges (10).

8. An operating method for the welding mechanism used in the processing of the metal fitting described in claim 7, characterized in that, Including the following steps: Step 1: Adjust the position of the side supporting wheel (5) in the adjustment keyway (7) according to the diameter of the necked flange (10) so that the necked flange (10) is directly above the bottom control wheel (4). Then, lower the top clamping wheel (6) to position the necked flange (10) to prevent it from detaching. Step 2: At this time, according to the virtual axis distance of the necked flange (10) from the virtual axis of the bolt docking hole (11), the first telescopic cylinder (33) controls the storage and installation box (13) to rise, so that the laser transceiver (19) is on one side of the lowermost bolt docking hole (11). At this time, the threaded rotation is used to push the screw rod (18) to control the extended positioning rod (16) to insert into the bolt docking hole (11) of the necked flange (10). During this period, if the bolt docking hole (11) is not directly above the bottom control wheel (4), the bottom control wheel (4) can be rotated to control the rotation of the necked flange (10) so that the bolt docking hole (11) corresponds to the laser transceiver (19). Step 3: When the two laser transceivers (19) are respectively inserted into the bolt docking holes (11) of the two necked flanges (10), the several bolt docking holes (11) of the two necked flanges (10) are correspondingly arranged. Then, the two third telescopic cylinders (35) extend towards the clamping frame (26) position, and the two clamping frames (26) horizontally clamp the combined pipe (28) through the clamping rollers (27). At this time, regardless of the diameter of the combined pipe (28), the virtual axis of the combined pipe (28) clamped by the four clamping rollers (27) is at a fixed position. At this time, if the length value of the virtual axis distance of the combined pipe (28) from the reference hole (32) is equal to the virtual axis distance length between the necked flange (10) and the virtual axis of the bolt docking hole (11), and the reference hole (32) corresponds to the laser transceiver (19), then the virtual axis of the combined pipe (28) is coaxial with the virtual axis of the necked flange (10). When the C-shaped welding installation frame (3) on one side controls the necked flange (10) to move towards the necked flange (10) on the other side, both sides of the combined pipe (28) respectively abut against the two necked flanges (10), facilitating the next welding operation. Step 4: The height adjustment of the combined pipe (28) is controlled by the second telescopic cylinder (34). When the distance between the virtual axis of the necked flange (10) and the virtual axis of the bolt docking hole (11) changes, the fourth telescopic cylinder (36) can control the reference plate (31) to move up and down to adjust, so that the distance between the reference hole (32) and the virtual axis of the combined pipe (28) changes correspondingly. Therefore, when the light of the laser transceiver (19) passes through the reference hole (32) and is received by another laser transceiver (19), the welding positions of the combined pipe (28) and the two necked flanges (10) are determined, and then stable welding is carried out.

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