Header large pipe welding tool

Abstract

The invention discloses a header large pipe welding tool. The header large pipe welding tool comprises a positioner mechanism, a rotating mechanism and a translation mechanism which are matched with one another; a translation mechanism is mounted in the middle of the positioner mechanism through a rotating mechanism, and is used for driving the rotating mechanism and the translation mechanism to realize turnover displacement under the turnover driving of the positioner mechanism; the rotating mechanism is used for rotating and driving to drive the translation mechanism to rotate and displace on the displacer mechanism again; the translation mechanism is provided with a translation assembly and a limiting assembly, the limiting assembly is used for limiting a large pipe to be welded to the translation assembly, and the translation assembly is used for driving the large pipe to translate so as to complete welding operation of all welding points. The automatic welding device has the advantages of simple and compact structure, high intelligent and automatic degree and good welding effect.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and specifically to a welding fixture for header pipes. Background Technology

[0002] Currently, welding of boiler header pipes is mainly done manually, with robotic welding being rare. The main reason is: Firstly, because different large pipes have multiple tubular welded parts in different positions, and the welding needs to be circular along the pipe opening, and the shape of the pipe weld seam needs to be intersecting lines and the weld seam needs to be multi-layered and multi-passed, which makes it very difficult for traditional automated welding to meet the requirements, resulting in poor automation and poor welding effect.

[0003] Secondly, this type of pipe is used in high-temperature and high-pressure environments, requiring high weld quality. The weld surface must be free of defects such as cracks, porosity, slag inclusions, weld beads, undercut, and lack of fusion. Each product also undergoes ultrasonic testing to detect deep-seated defects within the weld; metallographic inspection is performed under a metallographic microscope to observe the weld's microstructure and determine if it meets requirements, and whether there are any abnormal structures such as overheating or undercooling. This places extremely high demands on the flexibility of the welding torch, making it very complex. Furthermore, if the welding torch is to remain stationary while the workpiece actively adapts to it, the requirements for the workpiece's various orientations and rotations are also very high, which is currently not feasible. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a simple and compact welding fixture for header pipes with a high degree of intelligence and automation and good welding effect.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A welding fixture for a header pipe includes a positioner mechanism, a rotating mechanism, and a translating mechanism that cooperate with each other. The translating mechanism is mounted on the middle of the positioner mechanism via the rotating mechanism, so as to drive the rotating mechanism and the translating mechanism together to achieve flipping and repositioning under the flipping drive of the positioner mechanism. The rotating mechanism is used to drive the translating mechanism to rotate and reposition again on the positioner mechanism. The translating mechanism is provided with a translating component and a limiting component. The limiting component is used to limit the pipe to be welded on the translating component. The translating component is used to drive the pipe to translate to complete the welding operation of each welding point.

[0006] As a further improvement to the above technical solution: The translation mechanism includes a platform mounted on a rotating mechanism; the translation component includes a translation frame, the bottom of which is slidably mounted on the platform via a first slide rail assembly, and the bottom of the translation frame is also provided with a rack along the translation direction. The platform is provided with a gear drive mechanism that meshes with the rack to drive the translation frame to translate on the platform.

[0007] The limiting assembly includes a fixed bearing seat and an adjustable bearing seat respectively located at both ends of the translation frame. Both the fixed bearing seat and the adjustable bearing seat are provided with clamping elements to limit and fix both ends of the large tube respectively. The adjustable bearing seat is slidably installed on the translation frame along the translation direction to accommodate large tubes of different lengths through sliding adjustment.

[0008] Both the fixed bearing seat and the adjustable bearing seat are provided with limiting blocks for supporting the end of the large pipe. The clamping component includes a pressure beam. Both ends of the pressure beam are detachably installed above the limiting blocks via vertical adjusting screws. A clamping screw passes through the middle of the pressure beam, and a limiting pressure plate is provided at the lower end of the clamping screw to clamp the end of the large pipe onto the limiting block.

[0009] The translation frame is also provided with two parallel limiting rails along the translation direction. The bottom sides of the adjusting support seat are provided with pulleys that can be slidably embedded in the limiting rails. The adjusting support seat also includes a top rod beam fixed to the translation frame. A top rod screw is passed through the top rod beam and is used to press against the adjusting support seat to limit the adjusting support seat that has slid into place.

[0010] The limiting assembly also includes multiple cylinder seats. Each cylinder seat has a pulley that can be slidably recessed into the limiting rail on both sides of its bottom to adjust the position of the cylinder seat according to the change of the welding point of the large pipe. Each cylinder seat has a cylinder on both sides of the large pipe placement position. Each of the driving ends of the two cylinders is provided with a limiting pressure block to press and limit the large pipe from both sides.

[0011] The platform is also equipped with a counterweight adjustment mechanism, which includes two bearing plates arranged parallel to each other on both sides of the translation frame. Each of the two bearing plates is equipped with a counterweight block that is slidably limited by a slide table. Each of the two bearing plates is equipped with a chain drive assembly on one side. The chain drive assembly is connected to the slide table to drive the counterweight block to slide on the platform to adjust the platform's center of gravity.

[0012] Each of the two support plates is also provided with a second slide rail assembly connected to the slide table on one side for guiding and limiting the slide table.

[0013] The positioner mechanism includes two opposing positioner rotary tables and a cradle fixture connected between the two positioner rotary tables. The positioner rotary tables are connected to a rotation drive mechanism to drive the cradle fixture to rotate. The rotation mechanism is located in the middle of the cradle fixture.

[0014] The rotating mechanism includes a rotating gear bearing disk and a rotating drive mechanism. The rotating gear bearing disk is rotatably disposed in the middle of the cradle fixture and fixedly connected to the bottom of the translation mechanism. The drive end of the rotating drive mechanism meshes with the rotating gear bearing disk to drive the rotating gear bearing disk to rotate.

[0015] Compared with the prior art, the advantages of the present invention are as follows: Firstly, the header pipe welding fixture of this invention uses a translation mechanism to limit and move the pipe to be welded. Then, through the cooperation of a positioner mechanism, a rotation mechanism, and the translation mechanism, the pipe can be rotated (with the positioner mechanism's axis as the rotation center), and adjusted in multiple directions, enabling welding operations at various welding points. In particular, the translation mechanism can move each component to the welding position, while the positioner and rotation mechanisms can continuously rotate and flip the component to achieve the optimal welding posture, thus facilitating excellent welding results for the header pipe. Compared to manual welding, this intelligent and automated welding fixture significantly reduces labor costs and ensures welding accuracy.

[0016] Secondly, the welding fixture for the header pipe of the present invention, by setting up a positioner mechanism, a rotating mechanism and a translation mechanism that cooperate with each other, can keep the welding torch stationary while the pipe actively adapts to the welding torch. This design facilitates the arrangement of the welding torch, does not require the flexibility of the welding torch, and directly omits the complex welding torch drive structure. On the other hand, the pipe rotates and flips around the stationary welding torch under the drive of the welding fixture, which facilitates continuous circular welding to ensure that the weld is circular along the pipe opening. This makes the shape of the pipe weld line intersecting, and multiple layers and multiple passes of weld can be welded through multiple flips and rotations. At the same time, it avoids the workpiece eccentricity, which greatly improves the reliability of welding and the quality of weld.

[0017] Thirdly, the welding fixture for the header pipe of the present invention uses a platform mounted on a rotating mechanism to slide and limit the translation frame on the platform via a first slide rail assembly. The translation frame is driven to move on the platform by a gear drive mechanism that meshes with a rack and pinion. This makes the translation mechanism flat and compact, greatly saving installation space. Furthermore, the gear and rack transmission structure has the advantages of high transmission accuracy and high rigidity, which is beneficial for bearing heavy workpieces and ensuring smooth transmission. The first slide rail assembly provides a limiting base for the translation frame, preventing the translation frame from falling off the platform during movement, thus greatly improving the safety and reliability of the fixture.

[0018] Fourth, the welding fixture for the header pipe of the present invention supports and limits the two ends of the large pipe by setting fixed bearing seats and adjustable bearing seats at both ends of the translation frame. By adjusting the position of the adjustable bearing seats on the translation frame, the translation frame can support large pipes of different lengths, which greatly improves the applicability of the fixture. Moreover, the sliding adjustment is simple and quick, which greatly improves the installation efficiency.

[0019] Fifth, the welding fixture for the large pipe of the present invention uses limiting blocks to support the end of the large pipe and a detachable pressure beam installed above the limiting blocks to facilitate the removal of the pressure beam when placing the large pipe. This allows the external hoisting mechanism to directly hoist the large pipe vertically onto the limiting blocks at both ends. Then, the pressure beam is installed via adjusting screws, and the limiting pressure plate at the lower end of the clamping screw presses the end of the large pipe onto the limiting blocks by rotating the clamping screw. This greatly ensures the installation strength of the large pipe, and the installation process is smooth and reliable. The large pipe will not interfere with the fixed support and the adjusting support to avoid damaging the large pipe.

[0020] Sixth, the welding fixture for the header pipe of the present invention uses two parallel limiting rails to limit the adjustment bearing seat, ensuring the reliable movement of the adjustment bearing seat on the translation frame. When the adjustment bearing seat moves into position, the top rod screw that passes through the top rod beam and faces the adjustment bearing seat will tighten the adjustment bearing seat in place to limit it, preventing the adjustment bearing seat from shifting position, further ensuring the locking and limiting of the pipe, and greatly improving the reliability and stability during welding.

[0021] Seventh, the welding fixture for the header pipe of the present invention further limits the circumferential movement of the pipe by setting multiple cylinder seats that can slide along the translation frame. The bottom of the cylinder seat can slide and be embedded in the pulley in the limiting rail. On the one hand, the cylinder seat limits the movement of the cylinder seat, and on the other hand, the cylinder seat and the limiting rail form rolling contact, so that the cylinder seat slides smoothly. When the cylinder seat is adjusted to the position, the cylinders at both ends are activated so that the limiting pressure block at the drive end presses the pipe tightly from both sides, preventing the pipe of a certain length from bending and deforming, further enhancing the limiting strength of the pipe, making the clamping force on the pipe uniform, and avoiding damage to the pipe.

[0022] Eighth, the header pipe welding fixture of the present invention is equipped with a counterweight adjustment mechanism that can be synchronously adjusted. When the translation frame extends outward toward the platform, the counterweight adjustment mechanism synchronously moves to the opposite side of the platform to offset and form a balance of the center of gravity. This effectively avoids the translation component from tipping over due to the imbalance of the center of gravity when the pipe and translation component extend, and greatly improves the safety and reliability of the fixture.

[0023] Ninth, the welding fixture for the large pipe of this invention uses two opposing positioner rotary tables to jointly bear and drive the entire load of the cradle fixture, the large pipe, the rotating mechanism, and the translation mechanism. Double-end support minimizes workpiece overhang and prevents bending deformation of the large pipe, providing a stable foundation for precision welding. The two positioner rotary tables rotate synchronously, causing the entire cradle fixture to continuously rotate 360° around a horizontal axis. This allows welds on the large pipe, originally on the top, side, or bottom surface, to be adjusted to the most ideal position through rotation. The rotating mechanism installed in the middle of the cradle fixture can drive the large pipe to rotate around its center of rotation. The rotation and flipping can be combined to create an infinite number of spatial postures, adjusting any complex spatial curve weld to the optimal welding angle, ensuring welding quality and efficiency.

[0024] The tenth is the welding fixture for the header pipe of the present invention. By setting a rotating gear bearing disc in the middle of the cradle fixture, the rotation drive mechanism can drive it to drive the translation mechanism and the pipe to rotate together. In coordination with the above-mentioned flipping motion, the weld seam on the pipe in any direction can be adjusted to the most ideal welding position, which greatly improves the welding quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of the welding fixture for the header pipe of the present invention.

[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of the positioner mechanism of the present invention.

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure principle of the translation mechanism of the present invention.

[0028] Figure 4 This is a three-dimensional structural principle diagram of the counterweight adjustment mechanism of the present invention.

[0029] Figure 5 This is a schematic diagram of the three-dimensional structure of the translation component supporting the large tube of the present invention.

[0030] Figure 6 This is a side view schematic diagram of the structural principle of the translation component carrying the large tube of the present invention.

[0031] Figure 7 This is a schematic diagram of the three-dimensional structure of the fixed support base of the present invention.

[0032] Figure 8 This is a schematic diagram of the three-dimensional structure of the adjustable support base of the present invention.

[0033] Figure 9 This is a schematic diagram of the three-dimensional structure of the cylinder seat of the present invention.

[0034] The labels in the diagram represent: 1. Positioner mechanism; 11. Positioner rotary table; 12. Cradle fixture; 2. Rotation mechanism; 21. Rotary gear bearing disc; 22. Rotation drive mechanism; 3. Translation mechanism; 31. Translation assembly; 311. Translation frame; 312. First slide rail assembly; 313. Rack; 314. Limit rail; 32. Limit assembly; 321. Fixed bearing seat; 322. Adjustable bearing seat; 3221. Top rod beam; 3222. 323. Top rod screw; 3231. Clamping component; 3232. Pressure beam; 3233. Adjusting screw; 3233. Clamping screw; 3234. Limiting plate; 324. Limiting block; 325. Cylinder seat; 326. Cylinder; 327. Limiting block; 33. Counterweight adjustment mechanism; 331. Bearing plate; 332. Slide table; 333. Counterweight block; 334. Chain drive assembly; 335. Second slide rail assembly; 34. Platform; 35. Gear drive mechanism. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to 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 a limitation of this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] like Figures 1 to 9As shown, the welding fixture for the header pipe in this embodiment includes a positioner mechanism 1, a rotating mechanism 2, and a translation mechanism 3 that cooperate with each other. The translation mechanism 3 is installed in the middle of the positioner mechanism 1 through the rotating mechanism 2, so as to drive the rotating mechanism 2 and the translation mechanism 3 together to achieve flipping and repositioning under the flipping drive of the positioner mechanism 1. The rotating mechanism 2 is used to drive the translation mechanism 3 to rotate and reposition again on the positioner mechanism 1. The translation mechanism 3 is provided with a translation component 31 and a limiting component 32. The limiting component 32 is used to limit the pipe to be welded to the translation component 31. The translation component 31 is used to drive the pipe to translate to complete the welding operation of each welding point.

[0040] The specific implementation principle is as follows: When using, the large tube is like Figure 1 , 3 As shown in A of section 5, with the welding torch position fixed, the large pipe to be welded is first placed on the translation component 31, and then the limiting component 32 is driven to limit the large pipe on the translation component 31. When the large pipe is in the limiting position, the flipping drive of the positioner mechanism 1 drives the rotation mechanism 2, the translation mechanism 3, and the large pipe to flip and reposition together. The rotation drive of the rotation mechanism 2 drives the translation mechanism 3 and the large pipe to rotate and reposition again on the positioner mechanism 1, so that the tubular weldment to be welded moves to the welding torch position and rotates and flips around the welding torch to ensure that each welding point can be welded. After welding a single weldment, the translation component 31 drives the large pipe to translate so that the next tubular weldment to be welded moves to the welding torch position, and then the above flipping and rotation process is repeated to complete the welding.

[0041] Through the aforementioned scientific and specialized design, this header large pipe welding fixture has the following advantages: Firstly, a translation mechanism 3 is used to limit and move the large pipe to be welded. Then, with the cooperation of the positioner mechanism 1, the rotation mechanism 2, and the translation mechanism 3, the large pipe can be flipped (with the axis of the positioner mechanism 1 as the center of flipping), rotated in a plane, and translated in multiple directions to achieve welding operations at each welding point. In particular, the translation mechanism 3 can move each part to be welded to the welding position, while the positioner mechanism 1 and the rotation mechanism 2 can flip and rotate the part to be welded to achieve the optimal welding posture without interruption, thus facilitating the welding torch operation and forming an excellent welding effect for the header pipe. Compared with manual welding, this intelligent and automated welding fixture greatly saves labor costs and ensures welding accuracy.

[0042] Secondly, by setting up a positioner mechanism 1, a rotating mechanism 2, and a translation mechanism 3 that cooperate with each other, the welding torch can remain stationary while the large pipe actively adapts to the welding torch. This design facilitates the arrangement of the welding torch, does not require high flexibility of the welding torch, and directly eliminates the need for a complex welding torch drive structure. On the other hand, the large pipe rotates and flips around the stationary welding torch under the drive of the welding fixture, which facilitates continuous circular welding. This ensures that the weld seam is circular along the pipe opening, making the shape of the pipe weld seam intersecting. Multiple flips and rotations can be used to weld multiple layers and multiple passes of weld seam, while avoiding workpiece eccentricity, which greatly improves the reliability of welding and the quality of weld seam.

[0043] like Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, the translation mechanism 3 includes a platform 34 mounted on the rotation mechanism 2; the translation component 31 includes a translation frame 311, the bottom of which is slidably mounted on the platform 34 by the first slide rail assembly 312, and the bottom of the translation frame 311 is also provided with a rack 313 along the translation direction. The platform 34 is provided with a gear drive mechanism 35 that meshes with the rack 313 to drive the translation frame 311 to translate on the platform 34. By setting a platform 34 installed on the rotating mechanism 2, the translation frame 311 is slidably and limitedly installed on the platform 34 via the first slide rail assembly 312. The translation frame 311 is driven to translate on the platform 34 by a gear drive mechanism 35 that meshes with the rack 313. This makes the translation mechanism 3 flat and compact, greatly saving installation space. The gear and rack transmission structure has the advantages of high transmission accuracy and high rigidity, which is conducive to bearing heavy workpieces and ensuring smooth transmission. The first slide rail assembly 312 provides a limiting base for the translation frame 311, preventing the translation frame 311 from falling off the platform 34 during the movement process, which greatly improves the safety and reliability of the tooling.

[0044] like Figure 3 , Figure 5 , Figure 6 In this embodiment, the limiting component 32 includes a fixed bearing seat 321 and an adjusting bearing seat 322 respectively disposed at both ends of the translation frame 311. Both the fixed bearing seat 321 and the adjusting bearing seat 322 are provided with clamping members 323 to limit and fix both ends of the large pipe. The adjusting bearing seat 322 is slidably mounted on the translation frame 311 along the translation direction to accommodate large pipes of different lengths through sliding adjustment. By using the fixed bearing seat 321 and the adjusting bearing seat 322 respectively disposed at both ends of the translation frame 311 to support and limit the ends of the large pipe, and by adjusting the position of the adjusting bearing seat 322 on the translation frame 311, the translation frame 311 can support large pipes of different lengths, greatly improving the applicability of the tooling. Furthermore, the sliding adjustment is simple and quick, significantly improving installation efficiency.

[0045] like Figure 7 and Figure 8 As shown in this embodiment, both the fixed support 321 and the adjustable support 322 are provided with limiting blocks 324 for supporting the end of the large pipe. The clamping member 323 includes a pressure beam 3231. Both ends of the pressure beam 3231 are detachably installed above the limiting block 324 through vertical adjusting screws 3232. A clamping screw 3233 passes through the middle of the pressure beam 3231, and a limiting pressure plate 3234 is provided at the lower end of the clamping screw 3233 for pressing the end of the large pipe onto the limiting block 324. By setting a limiting block 324 to support the end of the large pipe, and setting a detachable pressure beam 3231 installed above the limiting block 324, the pressure beam 3231 can be removed when placing the large pipe. This allows the external hoisting mechanism to directly hoist the large pipe vertically onto the limiting blocks 324 at both ends. Then, the pressure beam 3231 is installed via the adjusting screw 3232. By rotating the clamping screw 3233, the limiting pressure plate 3234 at the lower end of the clamping screw 3233 presses the end of the large pipe onto the limiting block 324. This greatly ensures the installation strength of the large pipe, and the installation process is smooth and reliable. The large pipe will not interfere with the fixed support 321 and the adjusting support 322, thus preventing damage to the large pipe.

[0046] like Figure 3 , Figure 5 and Figure 8 As shown, in this embodiment, the translation frame 311 is also provided with two parallel limiting rails 314 along the translation direction. The bottom sides of the adjusting support 322 are provided with pulleys that can be slidably embedded in the limiting rails 314. The adjusting support 322 also includes a top rod beam 3221 fixed on the translation frame 311. A top rod screw 3222 is passed through the top rod beam 3221 and is used to press against the adjusting support 322 to limit the adjusting support 322 that has slid into place. By setting two parallel limiting rails 314 to limit the adjustment bearing seat 322, the reliable movement of the adjustment bearing seat 322 on the translation frame 311 is ensured. When the adjustment bearing seat 322 moves into place, the top rod screw 3222, which is set towards the adjustment bearing seat 322 and passes through the top rod beam 3221, will press the adjustment bearing seat 322 into place to limit it, preventing the position of the adjustment bearing seat 322 from shifting, further ensuring the locking and limiting of the large pipe, and greatly improving the reliability and stability during welding.

[0047] like Figure 3 , Figure 5 , Figure 9As shown, in this embodiment, the limiting component 32 also includes multiple cylinder seats 325. The bottom sides of the cylinder seat 325 are provided with pulleys that can be slidably embedded in the limiting rail 314 to adjust the position of the cylinder seat 325 according to the change of the welding point of the large pipe. A cylinder 326 is provided on both sides of the cylinder seat 325 at the placement position of the large pipe. The driving end of the two cylinders 326 is provided with a limiting pressure block 327 to press and limit the large pipe from both sides. By setting multiple cylinder seats 325 that can slide along the translation frame 311, the circumferential direction of the large tube is further limited. The bottom of the cylinder seat 325 can slide and be embedded in the limiting rail 314. On the one hand, the cylinder seat 325 is limited, and on the other hand, the cylinder seat 325 and the limiting rail 314 form rolling contact, so that the cylinder seat 325 slides smoothly. When the cylinder seat 325 is adjusted to the right position, the cylinders 326 at both ends are activated so that the limiting pressure block 327 at the drive end presses the large tube from both sides to limit it, so as to prevent the large tube of a certain length from bending and deforming, further enhancing the limiting strength of the large tube, making the clamping force on the large tube uniform, and avoiding damage to the large tube.

[0048] like Figure 1 , Figure 3 , Figure 4 , Figure 6 As shown, in this embodiment, the platform 34 is also provided with a counterweight adjustment mechanism 33. The counterweight adjustment mechanism 33 includes two bearing plates 331 arranged parallel to both sides of the translation frame 311. Each of the two bearing plates 331 is slidably limited by a slide table 332 to install a counterweight block 333. Each side of the two bearing plates 331 is provided with a chain drive assembly 334. The chain drive assembly 334 and the slide table 332 are connected to drive the counterweight block 333 to slide on the platform 34 to adjust the load center of gravity of the platform 34. Specifically, the chain drive assembly 334 includes a drive motor, a drive spindle, a drive wheel, and a driven shaft. The drive wheel and the driven shaft are respectively located at both ends of the platform 34. A chain is wound around the drive wheel and the driven wheel. The drive motor is connected to the drive wheel through the drive spindle and drives the drive wheel to rotate. The chain is connected to the slide table 332 through a connector to drive the counterweight block 333 to move along the chain under the drive of the drive motor.

[0049] Because the large pipe has a certain length and weight, and welding points at different locations need to be moved to the center for welding, if the translation frame 311 extends too far beyond the platform 34, it will inevitably affect the balance of the entire equipment, causing a safety accident. Therefore, a counterweight adjustment mechanism 33 is installed for synchronous translation adjustment. Figure 3 As shown, when the translation frame 311 extends and translates to the left side of the platform 34, the counterweight adjustment mechanism 33 simultaneously translates to the right side of the platform 34, offsetting each other to achieve a balance. Figure 1As shown, when the translation frame 311 extends and moves to the right side of the platform 34, the counterweight adjustment mechanism 33 also moves synchronously to the left side of the platform 34, offsetting each other and forming a balance. This effectively prevents the translation assembly 31 from tipping over due to imbalance of the center of gravity when the large pipe and the translation assembly 31 extend, greatly improving the safety and reliability of the tooling.

[0050] like Figure 4 , Figure 6 As shown, in this embodiment, each of the two support plates 331 is further provided with a second slide rail assembly 335 connected to the slide table 332 on one side for guiding and limiting the slide table 332. By setting the second slide rail assembly 335 to further guide and limit the slide table 332, the slide table 332 carrying a certain weight of counterweight 333 can move smoothly, avoiding the slide table 332 from deviating, and improving the stability and reliability of the counterweight 333 sliding on the platform 34.

[0051] like Figure 1 , Figure 2 As shown, in this embodiment, the positioner mechanism 1 includes two opposing positioner rotary tables 11 and a cradle fixture 12 connected between the two rotary tables 11. The rotary tables 11 are connected to a rotation drive mechanism (not shown in the figure) to drive the cradle fixture 12 to rotate. The rotation mechanism 2 is located in the middle of the cradle fixture 12. By setting the two opposing positioner rotary tables 11 to jointly bear and drive the cradle fixture 12 and its main pipe, rotation mechanism 2, translation mechanism 3, and other loads, the double-end support can minimize workpiece overhang and avoid bending deformation of the main pipe, providing a stable foundation for precision welding. The two positioner rotary tables 11 rotate synchronously, driving the entire cradle fixture 12 to rotate 360 ​​degrees continuously around the horizontal axis. This allows the welds on the main pipe that were originally on the top, side, and bottom surfaces to be adjusted to the most ideal position through rotation. The rotation mechanism 2, installed in the middle of the cradle fixture 12, can drive the main pipe to rotate around the rotation center. The flipping and rotating can be combined to create an infinite number of spatial postures, which can adjust any complex spatial curve weld to the optimal welding angle, thus ensuring welding quality and efficiency.

[0052] like Figure 1 and Figure 2As shown, in this embodiment, the rotating mechanism 2 includes a rotating gear bearing disk 21 and a rotating drive mechanism 22. The rotating gear bearing disk 21 is rotatably disposed in the middle of the cradle fixture 12 and fixedly connected to the bottom of the translation mechanism 3. The drive end of the rotating drive mechanism 22 meshes with the rotating gear bearing disk 21 to drive the rotating gear bearing disk 21 to rotate. By setting the rotating gear bearing disk 21 in the middle of the cradle fixture 12, the rotating drive mechanism 22 can drive it to rotate together with the translation mechanism 3 and the large pipe. In conjunction with the aforementioned flipping motion, the weld seam on the large pipe in any direction can be adjusted to the most ideal welding position, greatly improving the welding quality.

[0053] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A welding fixture for header pipes, characterized in that: It includes a positioner mechanism (1), a rotating mechanism (2), and a translation mechanism (3) that cooperate with each other; the middle part of the positioner mechanism (1) is equipped with a translation mechanism (3) through the rotating mechanism (2) to drive the rotating mechanism (2) and the translation mechanism (3) to achieve flipping and repositioning under the flipping drive of the positioner mechanism (1); the rotating mechanism (2) is used to drive the translation mechanism (3) to rotate and reposition again on the positioner mechanism (1); the translation mechanism (3) is provided with a translation component (31) and a limiting component (32), the limiting component (32) is used to limit the large pipe to be welded on the translation component (31), and the translation component (31) is used to drive the large pipe to translate to complete the welding operation of each welding point.

2. The welding fixture for the header pipe according to claim 1, characterized in that: The translation mechanism (3) includes a platform (34) mounted on the rotation mechanism (2); the translation component (31) includes a translation frame (311), the bottom of which is slidably limited and mounted on the platform (34) by a first slide rail assembly (312), and the bottom of the translation frame (311) is also provided with a rack (313) along the translation direction. The platform (34) is provided with a gear drive mechanism (35) that meshes with the rack (313) to drive the translation frame (311) to translate on the platform (34).

3. The welding fixture for the header pipe according to claim 2, characterized in that: The limiting component (32) includes a fixed bearing seat (321) and an adjusting bearing seat (322) respectively located at both ends of the translation frame (311). Both the fixed bearing seat (321) and the adjusting bearing seat (322) are provided with clamping parts (323) for limiting and fixing the two ends of the large tube respectively. The adjusting bearing seat (322) is slidably installed on the translation frame (311) along the translation direction for adjusting to accommodate large tubes of different lengths by sliding.

4. The welding fixture for the header pipe according to claim 3, characterized in that: Both the fixed support seat (321) and the adjustable support seat (322) are provided with limiting blocks (324) for supporting the end of the large pipe. The clamping member (323) includes a pressure beam (3231). Both ends of the pressure beam (3231) are detachably installed above the limiting block (324) through vertical adjusting screws (3232). A clamping screw (3233) is provided in the middle of the pressure beam (3231), and a limiting pressure plate (3234) is provided at the lower end of the clamping screw (3233) for pressing the end of the large pipe onto the limiting block (324).

5. The welding fixture for the header pipe according to claim 3, characterized in that: The translation frame (311) is also provided with two parallel limiting rails (314) along the translation direction. The bottom sides of the adjustment bearing seat (322) are provided with pulleys that can be slidably embedded in the limiting rails (314). The adjustment bearing seat (322) also includes a top rod beam (3221) fixed on the translation frame (311). A top rod screw (3222) is passed through the top rod beam (3221) and is used to press against the adjustment bearing seat (322) to limit the adjustment bearing seat (322) after it has slid into place.

6. The welding fixture for the header pipe according to claim 5, characterized in that: The limiting component (32) also includes multiple cylinder seats (325). The bottom sides of the cylinder seats (325) are provided with pulleys that can be slidably embedded in the limiting rail (314) to adjust the position of the cylinder seats (325) according to the changes in the welding points of the large pipe. A cylinder (326) is provided on both sides of the large pipe placement position on the cylinder seats (325). The driving ends of the two cylinders (326) are provided with limiting pressure blocks (327) to press and limit the large pipe from both sides.

7. The welding fixture for the header pipe according to claim 5, characterized in that: The platform (34) is also provided with a counterweight adjustment mechanism (33), which includes two bearing plates (331) arranged in parallel on both sides of the translation frame (311). Each of the two bearing plates (331) is equipped with a counterweight block (333) which is slidably limited by a slide table (332). Each of the two bearing plates (331) is provided with a chain drive assembly (334) on one side. The chain drive assembly (334) and the slide table (332) are connected to drive the counterweight block (333) to slide on the platform (34) to adjust the center of gravity of the platform (34).

8. The welding fixture for the header pipe according to claim 7, characterized in that: Each of the two support plates (331) is also provided with a second slide rail assembly (335) connected to the slide table (332) on one side for guiding and limiting the slide table (332).

9. The welding fixture for the header pipe according to claim 1, characterized in that: The positioner mechanism (1) includes two positioner rotary tables (11) arranged opposite to each other and a cradle fixture (12) connected between the two positioner rotary tables (11). The positioner rotary tables (11) are connected to a rotation drive mechanism to drive the cradle fixture (12) to rotate. The rotation mechanism (2) is located in the middle of the cradle fixture (12).

10. The welding fixture for the header pipe according to claim 9, characterized in that: The rotating mechanism (2) includes a rotating gear bearing disk (21) and a rotating drive mechanism (22). The rotating gear bearing disk (21) is rotatably disposed in the middle of the cradle fixture (12) and fixedly connected to the bottom of the translation mechanism (3). The drive end of the rotating drive mechanism (22) meshes with the rotating gear bearing disk (21) to drive the rotating gear bearing disk (21) to rotate.

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