Flange and pipe girth weld welding equipment and welding method for Christmas tree

Abstract

The present application relates to the technical fields of flange and pipeline welding, and discloses a welding equipment and method for girth welds between flanges of Christmas trees and pipelines, which comprises a carrier and a first support frame installed on the top of the carrier; a supporting block arranged above the first support frame and used for supporting a four-way pipe fitting; a driving rotating part arranged on the bottom and top of the first support frame and used for driving the supporting block to rotate. The present application can realize automatic alignment and hole centering after flange hoisting through the cooperation of the inserting rod, swing oil cylinder and symmetrically arranged first distance sensor in the flange position and hole position correction system, and can realize the support, lifting and axial pushing butt joint of the large and small flanges of the Christmas tree through the three hydraulic cylinders in the supporting and butt joint part and the double-specification limiting grooves opened on the bracket.

Description

Technical Field

[0001] This invention relates to the field of flange and pipeline welding technology, specifically to welding equipment and welding method for circumferential welds between treehouse flanges and pipelines. Background Technology

[0002] Currently, in oilfield surface engineering, the wellhead, as the core equipment for controlling oil well pressure and flow, often uses four-way fittings in its main structure. The four ports of this four-way fitting typically need to be connected to standard flanges of different specifications through a circumferential weld process to facilitate subsequent connection to external equipment such as oil pipelines, valves, and throttles.

[0003] Currently, the conventional process for welding such four-way pipe fittings and flanges mostly involves manual welding, supplemented by manual calibration and assembly. The operation process is as follows: first, the flange is placed on or against the end of the four-way pipe fitting. The operator uses visual inspection or simple tools such as rulers and squares to repeatedly tap, pry, or pad the flange to adjust the perpendicularity of the flange end face relative to the pipe axis and the alignment of the flange hole with the pipe in a specific direction until all parameters meet the requirements of the welding process specifications. Then, spot welding and full welding are performed. The entire welding process is highly dependent on the operator's experience and manual operation skills. On the one hand, manual adjustment and calibration are inefficient and cannot meet the production needs of batch processing. On the other hand, the accuracy and stability of manual positioning are poor, and problems such as perpendicularity deviation and alignment misalignment are prone to occur, which directly affect the welding quality of the subsequent circumferential weld, thereby increasing the risk of leakage after the wellhead is put into operation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides welding equipment and methods for circumferential welds between oil wellhead flanges and pipelines. The main purpose is to solve the problem that operators rely on visual inspection or simple tools such as rulers and squares to repeatedly tap, pry, or pry the flange to adjust the perpendicularity of the flange end face relative to the pipeline axis and the alignment of the flange hole with the pipeline in a specific direction until all parameters meet the welding process requirements before spot welding and full welding are performed. The entire welding process is highly dependent on the operator's experience and manual skill.

[0005] To achieve the above objectives, the present invention provides the following technical solution: Equipment for welding the circumferential weld between the wellhead flange and the pipeline, including: A carrier frame and a first support frame, the first support frame being mounted on top of the carrier frame; The support block is located above the first support frame and is used to support the four-way pipe fitting. The bottom and top of the first support frame are provided with a drive rotation component, which is used to drive the support block to rotate. The support and docking components, as well as the flange position and hole alignment system, are provided on the top of the first support frame to support and dock the flange. The flange position and hole alignment system is provided on the top of the carrier frame to correct the docking position of the flange and the four-way pipe fitting, while ensuring the alignment of the flange holes. The welding component, mounted on top of the carrier via a drive component, is used for electric welding and circumferential welding of flanges.

[0006] Furthermore, the support and docking components include: Two slide rails and a first slide bracket that slides together; the two slide rails are fixedly connected to the top of the first support frame; the first slide bracket is slidably connected to the top of the two slide rails via a slide table. The second hydraulic cylinder is fixedly connected to the side of the first support frame away from the first slide, and the telescopic end of the second hydraulic cylinder passes through the first support frame and is fixed to the first slide. The bracket is located on the top of the first carriage. The top of the bracket has a first limiting groove and a second limiting groove. The first limiting groove is located below the second limiting groove. The size of the first limiting groove is adapted to the small flange and is used to support the small flange. The size of the second limiting groove is adapted to the large flange and is used to support the large flange. The third hydraulic cylinder is fixedly connected to the bottom of the first slide, and the telescopic end of the third hydraulic cylinder passes through the first slide and is fixed to the bracket. The clearance groove is opened at the top of the frame and is used to clear the third hydraulic cylinder.

[0007] Based on the aforementioned solution, the flange position and bore alignment system includes: The second support frame is fixedly connected to the top of the first support frame, and the top of the second support frame is provided with a second slide. The rotating rod is rotatably connected to the side of the second slide near the bracket via a bearing. Two insert rods are fixedly connected to the side of the rotating rod away from the second slide. The diameters of the two insert rods are respectively adapted to the diameters of the large and small flange holes, and the ends of the insert rods are pointed and conical. The first fixed frame is fixedly connected to one side of the second slide. Two symmetrically arranged first distance sensors are fixedly connected to the side of the first fixed frame near the rotating rod, and the detection ends of the two first distance sensors face the rotating rod. The swing cylinder and the fourth hydraulic cylinder are fixedly connected to the top of the second slide and are used to drive the rotating rod to rotate along the axis. The fourth hydraulic cylinder is fixedly connected to one side of the second support frame and the telescopic end of the fourth hydraulic cylinder is fixed to the second slide. The docking position detection system is located on the side of the second carriage away from the rotating rod and is used to detect the flange position.

[0008] As a further embodiment of the present invention, the docking position detection system includes a second fixed frame fixedly connected to the side of the second carriage away from the rotating rod, and two symmetrically arranged second distance sensors fixedly connected to one side of the second fixed frame.

[0009] Furthermore, the drive component includes a third support frame fixedly connected to the top of the first support frame, a first cylinder fixedly connected to one side of the third support frame, a second connecting frame fixedly connected to the telescopic end of the first cylinder, a second cylinder fixedly connected to the top of the second connecting frame, and the telescopic end of the second cylinder connected to the welding component.

[0010] Based on the aforementioned solution, the welded components include: The first connecting frame is fixed to the telescopic end of the second cylinder. A rotating frame is provided on one side of the first connecting frame. The rotating frame has a hollow frame structure. A first self-locking geared motor is fixedly connected inside the first connecting frame. The first self-locking geared motor is used to drive the rotating frame to rotate along the axis. Support plates are fixedly connected to the inner walls on both sides of the rotating frame. Multiple welding torches are divided into two symmetrical groups, with two torches in each group. The two torches are used to weld the inside and outside of the flange respectively. The two torches in the same group are connected to the rotating frame through a power unit.

[0011] As a further embodiment of the present invention, the power component includes: Two third carriages are provided, both of which are located on top of the support plate and are fixed to the welding torch. Two protrusions and two sliding grooves are provided for sliding. The two protrusions are fixedly connected to the top of the support plate, and the top of the two sliding grooves is provided with a third slide. A push plate is located inside the rotating frame, and a third cylinder is fixedly connected to one outer wall of the rotating frame. Two connecting rods, with their ends fixed to the third carriage and the push plate, respectively.

[0012] Furthermore, the drive rotating component includes a mounting bracket fixedly connected to the top of the first support frame, a turntable rotatably connected to the top of the mounting bracket, and the turntable being fixed to the support block. A second self-locking geared motor is fixedly connected to the top of the first support frame, and the output shaft of the second self-locking geared motor is fixed to the turntable. A locking component for fixing the turntable is provided on one side of the mounting bracket. The top of the support block is detachably connected to the pressure block by bolts. Both the top of the support block and the bottom of the pressure block are provided with grooves. The grooves of the support block and the pressure block are used to accommodate the four-way pipe fitting.

[0013] Based on the aforementioned scheme, the locking component includes multiple rotationally symmetrical insertion holes opened on the outside of the turntable, a first hydraulic cylinder is fixedly connected to one side of the mounting bracket, and the telescopic end of the first hydraulic cylinder passes through the mounting bracket and is inserted into the insertion hole.

[0014] Based on the above, the welding method for the circumferential weld between the tree flange and the pipeline is as follows: Step 1: Use a cutting machine to cut beveled surfaces at the four ends of the four-way pipe fitting, and at the same time cut beveled surfaces on one side of the inner wall of the flange inserted into the four-way pipe fitting. Step 2: Next, place the four-way fitting on the support block and support the four-way fitting with the support block; Step 3: Then use an external crane to lift the small flange and place it on one side of the flange position and hole alignment system. The flange position and hole alignment system will then perform hole alignment on the lifted flange. Step 4: Then, use the support and docking components to lift and untie the hoisting ropes. The support and docking components then move the flange axially to dock with the four-way fitting. Step 5: Start the drive unit to move the welding component to the joint between the flange and the four-way fitting. First, use the welding component to perform electric welding. Then, remove the support and docking components, and then perform continuous circumferential welding on the welding component to the joint. Step Six: After the flange welding is completed here, start the drive rotation component to rotate the four-way pipe fitting 180 degrees, so that the next end to be welded can be moved to the welding station. Repeat steps three to five to complete this welding. Then weld the large flange. At this time, start the drive rotation component to rotate the four-way pipe fitting 90 degrees, so that the next end to be welded can be moved to the welding station. Repeat steps three to five to complete this welding. Then, start the drive rotation component to rotate the four-way pipe fitting 180 degrees and repeat steps three to five to complete the welding of the last end. Step 7: After welding is completed, use lifting equipment to lift the welded workpiece off the equipment as a whole to complete the entire welding process.

[0015] Compared with the prior art, the present invention provides welding equipment and welding method for circumferential welds between the tree flange and the pipeline, which has the following beneficial effects: 1. This invention achieves automatic alignment and hole centering after flange hoisting by coordinating the insertion rod, swing cylinder, and symmetrically arranged first distance sensor in the flange position and hole alignment system. This solves the technical problems of poor alignment accuracy and low efficiency caused by repeated manual tapping and measurement of hole positions, and significantly improves the orientation consistency of flange docking.

[0016] 2. This invention achieves the support, lifting, and axial pushing docking of the large and small flanges of the oil well tree through three hydraulic cylinders in the support and docking components and dual-specification limiting grooves on the bracket, ensuring the verticality and centering of the flanges, realizing intelligent manufacturing, and with the distance sensor of the docking position detection system for precise positioning, it completely solves the technical problems of high labor intensity, large positioning deviation, and poor stability of manual lifting docking.

[0017] 3. This invention achieves rapid adaptation and adjustment of the radial position of the welding torch and automatic welding around the circumference by setting a circumferential welding structure consisting of a rotating frame, symmetrical double sets of welding torches and an inclined slide power component in the welding component. In addition, the power component can adjust multiple welding torches at the same time, enabling simultaneous welding of the inner and outer sides of the circumferential weld seam of flanges and four-way pipe fittings.

[0018] 4. This invention achieves automatic switching of different welding ports of the four-way pipe fitting in a single clamping operation by combining the drive rotating component and the locking component. The hydraulic cylinder extension end in the locking component is inserted into the positioning hole on the turntable to ensure rigid locking after rotation into place. This solves the problem of cumbersome process caused by repeated disassembly and assembly of pipe fittings in traditional processing and effectively shortens the overall processing cycle. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the welding equipment for the circumferential weld between the tree flange and the pipeline proposed in this invention; Figure 2 This is a schematic diagram of the four-way pipe fitting placement structure of the circumferential weld seam welding equipment for the oil well tree flange and pipeline proposed in this invention; Figure 3 The present invention provides a welding device for the circumferential weld between the tree flange and the pipeline. Figure 1 A partially enlarged structural diagram; Figure 4 This is a schematic diagram of the bracket structure of the circumferential weld seam welding equipment for the tree flange and pipeline proposed in this invention; Figure 5 This is a schematic diagram of the first limiting groove limiting small flange structure of the circumferential weld seam welding equipment for the oil well tree flange and pipeline proposed in this invention; Figure 6 This is a schematic diagram of the second limiting groove limiting flange structure of the circumferential weld seam welding equipment for the oil well tree flange and pipeline proposed in this invention; Figure 7 This is a schematic diagram of the flange position and hole alignment system and the docking position detection system of the circumferential weld equipment for the oil well flange and pipeline proposed in this invention. Figure 8 This is a schematic diagram of the exploded structure of the drive rotating component and the pressure block of the circumferential weld seam welding equipment for the oil well flange and pipeline proposed in this invention; Figure 9 This is a schematic diagram of the second distance sensor detecting the small flange structure of the circumferential weld seam welding equipment for the tree flange and pipeline proposed in this invention; Figure 10 This is a schematic diagram of the second distance sensor detecting the large flange structure of the circumferential weld seam welding equipment for the tree flange and pipeline proposed in this invention; Figure 11This is a schematic diagram of the locking component structure of the circumferential weld seam welding equipment for the tree flange and pipeline proposed in this invention; Figure 12 This is a schematic diagram of the welding components and drive components of the circumferential weld seam welding equipment for the tree flange and pipeline proposed in this invention. Figure 13 This is a schematic diagram of the welding components and bracket structure of the circumferential weld seam welding equipment for the tree flange and pipeline proposed in this invention; Figure 14 This is a schematic diagram of the welding component small flange structure of the circumferential weld seam welding equipment for the oil well tree flange and pipeline proposed in this invention; Figure 15 This is a schematic diagram of the welding component of the circumferential welded flange of the oil well tree flange and pipeline welding equipment proposed in this invention; Figure 16 This is a flowchart of the flange position and hole alignment system for the circumferential weld seam welding equipment for the wellhead flange and pipeline proposed in this invention; Figure 17 The present invention provides a welding device for the circumferential weld between the tree flange and the pipeline. Figure 1 Flowchart of the docking position detection system.

[0020] In the diagram: 1. Welding component; 2. Locking component; 3. Drive rotation component; 4. Support and docking component; 5. Flange position and hole alignment system; 6. Docking position detection system; 7. Drive component; 8. Carrier; 9. First support frame; 10. Support block; 11. Pressure block; 12. Groove; 101. Rotating frame; 102. Support plate; 103. Welding torch; 104. Power unit; 105. First self-locking geared motor; 106. First connecting frame; 1041. Third carriage; 1042. Slide groove; 1043. Protrusion; 1044. Connecting rod; 1045. Push plate; 1046. Third cylinder; 201. First hydraulic cylinder; 202. Insertion hole; 301. Second self-locking geared motor; 302. Mounting bracket; 303. Turntable; 401. Second hydraulic cylinder; 402. Slide rail; 403. First slide; 404. Third hydraulic cylinder; 405. Bracket; 406. Alternating groove; 407. First limiting groove; 408. Second limiting groove; 501. Swing cylinder; 502. Second slide; 503. Second support frame; 504. Fourth hydraulic cylinder; 505. Rotating rod; 506. Insert rod; 508. First distance sensor; 509. First fixing frame; 601. Second mounting bracket; 602. Second distance sensor; 701. Third support frame; 702. First cylinder; 703. Second connecting frame; 704. Second cylinder. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] Please see Figures 1-17 As shown, the welding equipment for the circumferential weld between the wellhead flange and the pipeline includes a carrier 8, a first support frame 9, a support block 10, a support and docking component 4, a flange position and hole alignment system 5, and a welding component 1, etc. In the prior art, operators rely on visual inspection or simple tools such as rulers and squares to repeatedly tap, pry, or pad the flange to adjust its position and angle. This process is not only time-consuming but also requires a high level of technical skill from the operators. The present invention addresses the above problems through the following structure. Specifically: The first support frame 9 is fixed to the top of the carrier frame 8 by bolts. The support block 10 is set above the first support frame 9. The support block 10 is used to support the four-way pipe fitting. The top of the support block 10 is detachably connected to the pressure block 11 by bolts. The top of the support block 10 and the bottom of the pressure block 11 are both provided with grooves 12. The grooves 12 of the support block 10 and the pressure block 11 are used to accommodate the four-way pipe fitting. After the four-way pipe fitting is placed into the groove 12 of the support block 10, the pressure block 11 is covered and locked with bolts, so that the four-way pipe fitting can be stably clamped and fixed, and the pipe fitting can be prevented from shifting during the welding process.

[0025] The flange position and hole alignment system 5 is located on the top of the carrier 8 to ensure the flange hole alignment. The flange position and hole alignment system 5 includes a second support frame 503, a rotating rod 505, a first fixed frame 509, a swing cylinder 501, and a fourth hydraulic cylinder 504. The second support frame 503 is bolted to the top of the first support frame 9. A second slide 502 is located on the top of the second support frame 503. A rotating rod 505 is rotatably connected to the side of the second slide 502 near the bracket 405 via bearings. Two insertion rods 506 are welded to the side of the rotating rod 505 away from the second slide 502. The diameters of the two insertion rods 506 are respectively adapted to the diameters of the large and small flange holes, and the ends of the insertion rods 506 are tapered. A fourth hydraulic cylinder 504 is bolted to one side of the second support frame 503, and the telescopic end of the fourth hydraulic cylinder 504 is fixed to the second slide 502. After the flange is lifted using a crane and moved to one side of the rotating rod 505 (e.g., ...), the flange will be lifted and moved to the side of the rotating rod 505. Figure 2 (As shown), then the fourth hydraulic cylinder 504 is activated, which drives the second slide 502 to move and insert the corresponding insertion rod 506 into the corresponding hole of the flange (as shown). Figure 3 As shown), the small-diameter insert rod 506 is inserted into the hole of the small flange, and the large-diameter insert rod 506 is inserted into the hole of the large flange. Then, the swing cylinder 501 is activated. The swing cylinder 501 is fixed to the top of the second slide 502 by bolts and is used to drive the rotating rod 505 to rotate along the axis. The swing cylinder 501 is concentric with the flange. The output end of the swing cylinder 501 drives the second slide 502 to swing and adjust, thereby driving the flange to rotate as a whole and correcting the flange. It should be noted that the swing cylinder 501 is existing technology. The swing cylinder 501 converts the pressure energy of hydraulic oil into mechanical energy, and drives the output shaft to swing back and forth within a certain angle through the internal helical rack or blade structure. Those skilled in the art can set it according to actual needs, which will not be elaborated here. like Figure 7 and Figure 16As shown, during the calibration process, the first fixing frame 509 is welded to one side of the second slide 502. Two symmetrically arranged first distance sensors 508 are fixed to the side of the first fixing frame 509 near the rotating rod 505 by bolts. When the rotating rod 505 is vertical, the distance between the two first distance sensors 508 and the rotating rod 505 is equal, and the detection ends of the two first distance sensors 508 are facing the rotating rod 505. The two first distance sensors 508 continuously detect the distance between themselves and the rotating rod 505. When the two distances are equal, it can be determined that the flange hole position is calibrated in place, that is, one of the holes is adjusted to the position of the vertical flange center, the swing cylinder 501 stops, and the automatic hole position calibration is completed without the need for repeated adjustments by the operator. The remaining flanges are calibrated in the same way to ensure that the holes of all flanges to be welded are in the same preset direction, which is convenient for subsequent docking with external pipes, valves and other components. The support and docking component 4 is set on the top of the first support frame 9 and is used to support and dock the flange, which solves the problems of high difficulty and low precision of manual lifting and docking. The support and docking component 4 includes two slide rails 402, a first slide 403, a second hydraulic cylinder 401, a bracket 405, a third hydraulic cylinder 404 and a clearance groove 406. Specifically as follows: The bracket 405 is disposed on the top of the first slide 403. The top of the bracket 405 has a first limiting groove 407 and a second limiting groove 408. The first limiting groove 407 is located below the second limiting groove 408. The size of the first limiting groove 407 is adapted to the small flange and is used to support the small flange (e.g., Figure 5 As shown), the dimensions of the second limiting groove 408 are adapted to the large flange to support the large flange (such as...). Figure 6 As shown), the third hydraulic cylinder 404 is fixed to the bottom of the first slide 403 by bolts, and the telescopic end of the third hydraulic cylinder 404 passes through the first slide 403 and is fixed to the bracket 405. Start the third hydraulic cylinder 404, which will drive the bracket 405 to move upward to the bottom of the flange, and support the flange to be welded in the corresponding first limiting groove 407 or second limiting groove 408 of the bracket 405. At this time, the center of the flange and the center of the end of the four-way pipe are kept coaxial. Then the hoisting rope of the crane is released. Specifically, two slide rails 402 are bolted to the top of the first support frame 9. The first slide 403 is slidably connected to the top of the two slide rails 402 via a slide table. The second hydraulic cylinder 401 is bolted to the side of the first support frame 9 away from the first slide 403. The telescopic end of the second hydraulic cylinder 401 passes through the first support frame 9 and is fixed to the first slide 403. The second hydraulic cylinder 401 drives the first slide 403 to move along the slide rails 402 toward the four-way pipe fitting. Then, the second hydraulic cylinder 401 is activated, which pushes the flange supported on the bracket 405 to move toward the end of the four-way pipe fitting until the flange is inserted into the outside of the end of the four-way pipe fitting, thereby completing the automatic docking of the flange and the four-way pipe fitting. The bracket 405 ensures the stability of the flange position during the docking process, eliminating the need for continuous manual lifting and adjustment, greatly reducing the labor intensity of the operators, and also ensuring the verticality and centering of the flange, reducing the probability of positioning deviation. During the movement of the first carriage 403, the clearance groove 406 is opened on the top of the carrier 8. The clearance groove 406 is used to clear the third hydraulic cylinder 404, ensuring that the third hydraulic cylinder 404 can move normally with the first carriage 403 and will not interfere with the structure of the carrier 8.

[0026] During the flange docking operation, the flange is prone to displacement deviation and it is difficult to accurately reach the docking position. To address this, a docking position detection system 6 is added to detect whether the docking position meets the requirements in real time. The docking position detection system 6 is located on the side of the second carriage 502 away from the rotating rod 505. Specifically, such as Figure 9 , Figure 10 and Figure 17 As shown, the docking position detection system 6 includes a second fixed frame 601 fixed to the side of the second slide 502 away from the rotating rod 505 by bolts. Two symmetrically arranged second distance sensors 602 are fixed to one side of the second fixed frame 601 by bolts. The detection ends of the two second distance sensors 602 are respectively aligned with one side of the small flange and the large flange. It should be noted that the first distance sensor 508 and the second distance sensor 602 are both existing technologies. The first distance sensor 508 and the second distance sensor 602 can be of model LGJG80. Those skilled in the art can set them according to actual needs, which will not be elaborated here. During docking, the second distance sensor 602 detects the distance between itself and the corresponding flange end face in real time. When the distance detected by the second distance sensor 602 reaches the preset value, it can be determined that the flange has moved to the preset docking position. At this time, the action of the second hydraulic cylinder 401 stops, and the docking is completed. There is no need for manual repeated verification of the position, which further improves the positioning accuracy and assembly efficiency. If the preset value is not reached, the second hydraulic cylinder 401 continues to push the first slide 403 to move until the detection distance meets the preset requirements. The entire process of position detection and adjustment is completed automatically.

[0027] Specifically, the welding component 1 is mounted on the top of the carrier 8 via the driving component 7, and is used for electric welding and circumferential welding of the flange. The driving component 7 includes a third support frame 701 fixed to the top of the first support frame 9 by bolts. A first cylinder 702 is fixed to one side of the third support frame 701 by bolts. The first cylinder 702 can drive the welding component 1 to move horizontally to adjust the position of the welding component 1 for welding flanges of different sizes. The telescopic end of the first cylinder 702 is fixed to a second connecting frame 703 by bolts. The top of the second connecting frame 703 is fixed to a second cylinder 704 by bolts. The telescopic end of the second cylinder 704 is connected to the welding component 1. The second cylinder 704 can drive the welding component 1 to move vertically. When the welding component 1 is at the top, it can leave operating space for flange docking and avoid structural interference to the flange docking process.

[0028] After the docking is completed, the second cylinder 704 drives the welding component 1 to move down, so that the welding component 1 is aligned with the position to be welded on the circumferential weld. Then, the welding component 1 is started to perform spot welding to initially position and fix the flange and the four-way pipe fitting. Then, the third hydraulic cylinder 404 is started, and the third hydraulic cylinder 404 drives the bracket 405 to move down, so that the bracket 405 is removed from the bottom of the flange to avoid structural interference to the subsequent rotation welding process.

[0029] To achieve rapid full-circumference welding of the circumferential weld, the welding component 1 includes a first connecting frame 106 and multiple welding torches 103. The first connecting frame 106 is fixed to the telescopic end of the second cylinder 704. A rotating frame 101 is provided on one side of the first connecting frame 106. The rotating frame 101 has a hollow frame structure. A first self-locking geared motor 105 is fixed inside the first connecting frame 106 by bolts. The first self-locking geared motor 105 is used to drive the rotating frame 101 to rotate along the axis. Activating the first self-locking geared motor 105 drives the rotating frame 101 to rotate circumferentially around the flange axis. Support plates 102 are welded to both inner walls. Multiple welding guns 103 are divided into two symmetrical groups, each group consisting of two welding guns 103. The two welding guns 103 are used to weld the inner and outer sides of the flange respectively. The two welding guns 103 in the same group are connected to the rotating frame 101 through the power component 104. The rotating frame 101 rotates 180 degrees, and the two groups of welding guns 103 can complete the welding operation of the entire circumferential weld in sequence by relying on the intelligent welding system. Compared with the single welding method of a single welding gun 103 welding once, it can effectively reduce welding deformation, improve welding quality, and also significantly shorten the welding operation time and improve welding processing efficiency. It should be noted that the welding torch 103 is existing technology. The welding torch 103 can use plasma arc welding to perform welding operations on oil well flanges and pipelines made of carbon steel or stainless steel. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0030] However, due to the difference in specifications between the large and small flanges of the wellhead, the placement of multiple welding torches 103 needs to be adjusted during welding operations to adapt to the welding conditions of the circumferential welds of the large and small flanges. Therefore, a power unit 104 is provided to solve the above problems. Specifically, the power component 104 includes two third slides 1041, two protrusions 1043, two slide grooves 1042, a push plate 1045, and two connecting rods 1044. The two third slides 1041 are both located on the top of the support plate 102 and are fixed to the welding torch 103. The two protrusions 1043 are both welded to the top of the support plate 102. The top of the three slides 1041 is provided on both slide grooves 1042 and the slide grooves 1042 are inclined. When the third slides 1041 are moved, the protrusions 1043 can slide along the inclined surface of the slide grooves 1042, thereby driving the welding torch 103 to move radially as a whole, so as to adjust the welding position of the welding torch 103. A push plate 1045 is disposed on the inner side of the rotating frame 101. A third cylinder 1046 is bolted to one outer wall of the rotating frame 101. The two ends of the connecting rod 1044 are respectively fixed to the third slide 1041 and the push plate 1045. When the two third cylinders 1046 are activated, they push or pull the push plate 1045 to move in a direction parallel to the flange axis. The push plate 1045 pushes or pulls the two third slides 1041 to move synchronously through the connecting rod 1044, so that the protrusion 1043 slides along the inclined groove 1042, thereby driving the two welding torches 103 to move radially inward or outward synchronously, thus adapting to flanges of different sizes (such as...). Figures 13-15 (as shown) It should be noted that when welding the small flange, after the electric welding is completed, the bracket 405 needs to move downwards. During the movement, the third cylinder 1046 needs to be activated first to move multiple welding torches 103 radially outwards, so that the welding torches 103 can avoid the movement path of the bracket 405 as a whole, thus preventing structural collision between the bracket 405 and the welding torches 103 when the bracket 405 is reset downwards. The first cylinder 702, the second cylinder 704, and the third cylinder 1046 in this application are all power actuators that convert the pressure energy of compressed air into mechanical energy. They can be connected to external air pipes and solenoid valves and drive the piston to perform linear reciprocating motion by controlling the gas inlet and outlet. They can be used in conjunction with magnetic switches, proximity switches, or photoelectric switches to achieve precise control of the extension and retraction displacement of the piston rods of the first cylinder 702, the second cylinder 704, and the third cylinder 1046. Those skilled in the art can set them according to actual needs, which will not be elaborated here.

[0031] Furthermore, after the flange welding at one end is completed, it is necessary to adjust the other port and weld the flange again. Therefore, a drive rotation component 3 is also provided. The drive rotation component 3 is located on the top of the first support frame 9. The drive rotation component 3 is used to drive the support block 10 to rotate, thereby adjusting different ports to be welded to the welding station. Specifically, the driving rotating component 3 includes a mounting bracket 302 fixed to the top of the first support frame 9 by bolts. The top of the mounting bracket 302 is rotatably connected to a turntable 303, and the turntable 303 is fixed to the support block 10. The top of the first support frame 9 is fixed to a second self-locking reduction motor 301 by bolts. The output shaft of the second self-locking reduction motor 301 is fixed to the turntable 303. Starting the second self-locking reduction motor 301 can drive the turntable 303 to rotate as a whole, thereby driving the support block 10 and the fixed four-way pipe fitting to rotate. The unwelded other end of the four-way pipe fitting is rotated to the welding station, and the flange of the other end can be directly connected and welded without disassembling and fixing the four-way pipe fitting again, which greatly simplifies the processing procedure and shortens the overall processing cycle. It should be noted that both the first self-locking geared motor 105 and the second self-locking geared motor 301 are existing technologies. A self-locking geared motor is a speed reduction transmission device that integrates a self-locking function. Its core feature is that it achieves "reverse self-locking" through a mechanical structure (such as a worm gear) - that is, the output shaft (load end) can only be driven to rotate by the input shaft (motor end), and the load reaction force of the output shaft cannot make the input shaft rotate in the opposite direction. At the same time, both the first self-locking geared motor 105 and the second self-locking geared motor 301 are equipped with encoders, and the number of rotations and rotation angle of the motor output shaft are controllable and highly accurate. Those skilled in the art can set them according to actual needs, which will not be elaborated here.

[0032] Further reference Figure 11 As shown, the turntable 303 will shake during the welding process, so a locking component 2 is also provided. The locking component 2 is located on one side of the mounting bracket 302. The locking component 2 includes multiple rotationally symmetrical insertion holes 202 opened on the outside of the turntable 303. The multiple insertion holes 202 are four insertion holes 202, and the four insertion holes 202 correspond one-to-one with the four ports of the four-way pipe fitting. The first hydraulic cylinder 201 is fixed to one side of the mounting bracket 302 by bolts, and the telescopic end of the first hydraulic cylinder 201 passes through the mounting bracket 302 and is inserted into the socket 202. When the four-way pipe is rotated into place, the first hydraulic cylinder 201 is activated and the telescopic end is inserted into the corresponding socket 202, which can complete the locking and fixing of the turntable 303, prevent the support block 10 and the four-way pipe from rotating or shaking during the welding process, and ensure the stability of the welding process. It should be noted that the first hydraulic cylinder 201, the second hydraulic cylinder 401, the third hydraulic cylinder 404, and the fourth hydraulic cylinder 504 in this application are all actuators in the hydraulic system. They achieve the telescopic function by cooperating with the hydraulic system, and achieve precise control of the extension and retraction displacement of the piston rods of the first hydraulic cylinder 201, the second hydraulic cylinder 401, the third hydraulic cylinder 404, and the fourth hydraulic cylinder 504 by cooperating with magnetic switches, proximity switches, or photoelectric switches. Those skilled in the art can set these according to actual needs, which will not be elaborated here.

[0033] Based on the above, the welding method for the circumferential weld between the tree flange and the pipeline is as follows: Step 1: Use a cutting machine to cut beveled surfaces at the four ends of the four-way pipe fitting, and at the same time cut beveled surfaces on one side of the inner wall of the flange inserted into the four-way pipe fitting. Step 2: Then place the four-way fitting on the support block 10 and support the four-way fitting with the support block 10; Step 3: Then use an external crane to lift the small flange and place it on one side of the flange position and hole position alignment system 5. The flange position and hole position alignment system 5 will then perform hole position alignment on the lifted flange. Step 4: Then, use the support and docking component 4 to lift and untie the hoisting ropes. The support and docking component 4 then moves the flange axially to dock with the four-way pipe fitting. Step 5: Start the drive unit 7 to move the welding unit 1 to the joint between the flange and the four-way pipe fitting. First, use the welding unit 1 to perform electric welding. Then, the support and docking unit 4 are removed, and then the welding unit 1 performs continuous circumferential welding on the joint. Step Six: After the flange welding is completed here, start the drive rotation component 3 to rotate the four-way pipe fitting 180 degrees, so that the next end to be welded can be moved to the welding station. Repeat steps three to five to complete this welding. Then weld the large flange. At this time, start the drive rotation component 3 to rotate the four-way pipe fitting 90 degrees, so that the next end to be welded can be moved to the welding station. Repeat steps three to five to complete this welding. Then, start the drive rotation component 3 to rotate the four-way pipe fitting 180 degrees and repeat steps three to five to complete the welding of the last end. Step 7: After welding is completed, use lifting equipment to lift the welded workpiece off the equipment as a whole to complete the entire welding process.

[0034] Working principle of the invention: After hoisting the four-way pipe fitting above the support block 10 and fixing it, first weld the small flange, then lift the small flange and move it to one side of the rotating rod 505. Then start the fourth hydraulic cylinder 504. The fourth hydraulic cylinder 504 pushes the second slide 502 to move, which drives the insertion rod 506 to insert into the corresponding hole of the small flange to complete the positioning. Subsequently, the swing cylinder 501 starts to drive the rotating rod 505 and the flange to rotate synchronously. The two first distance sensors 508 detect the distance with the rotating rod 505 in real time. After the detected distance is consistent, the swing cylinder 501 stops moving. Then, the third hydraulic cylinder 404 drives the bracket 405 to lift, inserting the small flange into the first limiting groove 407 to complete the support. Subsequently, the fourth hydraulic cylinder 504 retracts to make the insertion rod 506 exit the flange hole. After the hoisting rope is released, the second hydraulic cylinder 401 pushes the first slide 403 to move along the slide rail 402 towards the four-way pipe fitting, pushing the small flange to the end of the four-way pipe fitting to complete the docking. During this process, the second distance sensor 602 detects the position of the flange end face in real time. After reaching the preset position, the second hydraulic cylinder 401 stops its action, completing the docking positioning. Then the drive component 7 moves, the first cylinder 702 adjusts the horizontal position of the welding component 1, and the second cylinder 704 drives the welding component 1 to move down, so that the welding gun 103 is aligned with the circumferential weld joint. The welding component 1 first completes spot welding to initially fix the small flange and the four-way pipe fitting. Then, the third hydraulic cylinder 404 drives the bracket 405 to reset downwards, allowing the bracket 405 to detach from the bottom of the flange; then, the power unit 104 adjusts the position of the welding torch 103 according to the size of the small flange, the third cylinder 1046 pushes the push plate 1045 to move, the push plate 1045 drives the third slide 1041 to slide through the connecting rod 1044, the protrusion 1043 slides along the inclined slide groove 1042, and drives the inner and outer welding torches 103 to move synchronously to the preset welding position. Subsequently, multiple welding torches 103 and the first self-locking geared motor 105 are started. The first self-locking geared motor 105 drives the rotating frame 101 to rotate at a constant speed around the flange axis. The two sets of symmetrically arranged welding torches 103 perform welding operations on the circumferential weld in sequence. The rotating frame 101 can complete the welding of the entire circumferential weld by rotating 180 degrees. The two welding torches 103 on the inner and outer sides work at the same time. Then the welding torch 103 stops working, and then the first self-locking geared motor 105 drives the rotating frame 101 to reset. After that, the driving component 7 drives the welding component 1 to move upward and reset as a whole, leaving room for operation. After the first flange welding is completed, the telescopic end of the first hydraulic cylinder 201 is pulled out from the insertion hole 202. The second self-locking geared motor 301 starts and drives the turntable 303 to rotate 180 degrees, rotating the port of the small flange to be welded at the other end of the four-way pipe fitting to the welding station. The above flange positioning, docking, and welding operations are repeated to complete the welding of the second small flange. Afterwards, the first hydraulic cylinder 201 is unlocked again, and the second self-locking geared motor 301 drives the turntable 303 to rotate 90 degrees, rotating the port of the large flange to be welded to the welding station. The above positioning, docking, and welding process is repeated. The power component 104 will readjust the radial position of the welding gun 103 according to the size of the large flange to adapt to the welding requirements of the large flange circumferential weld. After the first large flange welding is completed, the second self-locking geared motor 301 drives the turntable 303 to rotate 180 degrees again, rotating the port of the last large flange to be welded to the welding station. The operation is repeated to complete the welding of the last large flange.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A welding device for the circumferential weld between the wellhead flange and the pipeline, characterized in that, include: The carrier (8) and the first support frame (9) are mounted on top of the carrier (8); Support block (10) is set above the first support frame (9). Support block (10) is used to support the four-way pipe fitting. The bottom and top of the first support frame (9) are provided with a drive rotation component (3). Drive rotation component (3) is used to drive the support block (10) to rotate. Support and docking components (4) and flange position and hole alignment system (5). The support and docking components (4) are located on the top of the first support frame (9) to support and dock the flange. The flange position and hole alignment system (5) is located on the top of the carrier frame (8) to correct the docking position of the flange and the four-way pipe fitting, while ensuring the flange hole alignment. Welding component (1), which is mounted on top of the carrier (8) via drive component (7), is used for electric welding and circumferential welding of flanges.

2. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 1, characterized in that, Support and docking components (4) include: Two slide rails (402) are connected to a first slide (403) for sliding. The two slide rails (402) are fixedly connected to the top of the first support frame (9), and the first slide (403) is slidably connected to the top of the two slide rails (402) through a slide table. The second hydraulic cylinder (401) is fixedly connected to the side of the first support frame (9) away from the first slide (403), and the telescopic end of the second hydraulic cylinder (401) passes through the first support frame (9) and is fixed to the first slide (403); The bracket (405) is located on the top of the first slide (403). The top of the bracket (405) is provided with a first limiting groove (407) and a second limiting groove (408). The first limiting groove (407) is located below the second limiting groove (408). The size of the first limiting groove (407) is adapted to the small flange and is used to support the small flange. The size of the second limiting groove (408) is adapted to the large flange and is used to support the large flange. The third hydraulic cylinder (404) and the avoidance groove (406) are fixedly connected to the bottom of the first slide (403), and the telescopic end of the third hydraulic cylinder (404) passes through the first slide (403) and is fixed to the bracket (405). The avoidance groove (406) is opened on the top of the carrier (8) and is used to avoid the third hydraulic cylinder (404).

3. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 2, characterized in that, The flange position and bore alignment system (5) includes: The second support frame (503) is fixedly connected to the top of the first support frame (9), and the top of the second support frame (503) is provided with a second slide (502). Rotating rod (505) is rotatably connected to the side of the second slide (502) near the bracket (405) via bearing. Two insert rods (506) are fixedly connected to the side of the rotating rod (505) away from the second slide (502). The diameters of the two insert rods (506) are respectively adapted to the diameters of the large and small flange holes, and the ends of the insert rods (506) are pointed and conical. The first fixed frame (509) is fixedly connected to one side of the second slide (502). Two symmetrically arranged first distance sensors (508) are fixedly connected to the side of the first fixed frame (509) near the rotating rod (505), and the detection ends of the two first distance sensors (508) are facing the rotating rod (505). The swing cylinder (501) and the fourth hydraulic cylinder (504) are fixedly connected to the top of the second slide (502) and are used to drive the rotating rod (505) to rotate along the axis. The fourth hydraulic cylinder (504) is fixedly connected to one side of the second support frame (503) and the telescopic end of the fourth hydraulic cylinder (504) is fixed to the second slide (502). The docking position detection system (6) is located on the side of the second carriage (502) away from the rotating rod (505) and is used to detect the flange position.

4. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 3, characterized in that, The docking position detection system (6) includes a second fixed frame (601) fixedly connected to the side of the second carriage (502) away from the rotating rod (505), and two symmetrically arranged second distance sensors (602) are fixedly connected to one side of the second fixed frame (601).

5. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 1, characterized in that, The drive component (7) includes a third support frame (701) fixedly connected to the top of the first support frame (9), a first cylinder (702) fixedly connected to one side of the third support frame (701), a second connecting frame (703) fixedly connected to the telescopic end of the first cylinder (702), a second cylinder (704) fixedly connected to the top of the second connecting frame (703), and the telescopic end of the second cylinder (704) connected to the welding component (1).

6. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 1, characterized in that, Welded component (1) includes: The first connecting frame (106) is fixed to the telescopic end of the second cylinder (704). A rotating frame (101) is provided on one side of the first connecting frame (106). The rotating frame (101) has a hollow frame structure. A first self-locking geared motor (105) is fixedly connected inside the first connecting frame (106). The first self-locking geared motor (105) is used to drive the rotating frame (101) to rotate along the axis. Support plates (102) are fixedly connected to the inner walls on both sides of the rotating frame (101). Multiple welding torches (103) are divided into two symmetrical groups, each group consisting of two welding torches (103). The two welding torches (103) are used to weld the inner and outer sides of the flange respectively. The two welding torches (103) in the same group are connected to the rotating frame (101) through a power component (104).

7. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 6, characterized in that, The power unit (104) includes: Two third carriages (1041) are provided on the top of the support plate (102), and the third carriages (1041) are fixed to the welding torch (103); Two protrusions (1043) and two sliding grooves (1042) that cooperate to slide. The two protrusions (1043) are fixedly connected to the top of the support plate (102), and the top of the two sliding grooves (1042) is provided with a third slide (1041). Push plate (1045) is located inside the rotating frame (101), and a third cylinder (1046) is fixedly connected to one outer wall of the rotating frame (101). Two connecting rods (1044) are fixed at both ends to the third carriage (1041) and the push plate (1045), respectively.

8. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 1, characterized in that, The drive rotation component (3) includes a mounting bracket (302) fixedly connected to the top of the first support frame (9). A turntable (303) is rotatably connected to the top of the mounting bracket (302), and the turntable (303) is fixed to the support block (10). A second self-locking geared motor (301) is fixedly connected to the top of the first support frame (9). The output shaft of the second self-locking geared motor (301) is fixed to the turntable (303). A locking component (2) for fixing the turntable (303) is provided on one side of the mounting bracket (302). The top of the support block (10) is detachably connected to the pressure block (11) by bolts. The top of the support block (10) and the bottom of the pressure block (11) are both provided with grooves (12). The grooves (12) of the support block (10) and the pressure block (11) are used to accommodate the four-way pipe fitting.

9. The welding equipment for the circumferential weld between the tree flange and the pipeline according to claim 8, characterized in that, The locking component (2) includes multiple rotationally symmetrical insertion holes (202) opened on the outside of the turntable (303). A first hydraulic cylinder (201) is fixedly connected to one side of the mounting bracket (302), and the telescopic end of the first hydraulic cylinder (201) passes through the mounting bracket (302) and is inserted into the insertion hole (202).

10. A method for welding the circumferential weld between a treehouse flange and a pipeline, applicable to the circumferential weld equipment for welding the treehouse flange and pipeline as described in claim 1, characterized in that, Includes the following steps: Step 1: Use a cutting machine to cut beveled surfaces at the four ends of the four-way pipe fitting, and at the same time cut beveled surfaces on one side of the inner wall of the flange inserted into the four-way pipe fitting. Step 2: Then place the four-way fitting on the support block (10) and support the four-way fitting with the support block (10); Step 3: Then use an external crane to lift the small flange and place it on one side of the flange position and hole position correction system (5). The flange position and hole position correction system (5) corrects the hole position of the lifted flange. Step 4: Then, use the support and docking component (4) to lift and untie the hoisting ropes of the crane. The support and docking component (4) then moves the flange axially to dock with the four-way fitting. Step 5: Start the drive unit (7) to move the welding unit (1) to the joint between the flange and the four-way fitting. First, use the welding unit (1) to perform electric welding. Then, the support and docking unit (4) are removed, and then the welding unit (1) performs continuous circumferential welding on the joint. Step 6: After the flange welding is completed here, start the drive rotation component (3) to drive the four-way pipe fitting to rotate 180 degrees, so that the next end to be welded can be moved to the welding station. Repeat steps 3 to 5 to complete this welding. Then weld the large flange. At this time, start the drive rotation component (3) to drive the four-way pipe fitting to rotate 90 degrees, so that the next end to be welded can be moved to the welding station. Repeat steps 3 to 5 to complete this welding. Then, start the drive rotation component (3) to drive the four-way pipe fitting to rotate 180 degrees and repeat steps 3 to 5 to complete the welding of the last end. Step 7: After welding is completed, use lifting equipment to lift the welded workpiece off the equipment as a whole to complete the entire welding process.

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