A straight guide pipe automatic argon arc welding device and method without positioning

Abstract

This invention discloses an automated argon arc welding device and method for straight conduit welding without tack welding. The device includes a pair of positioners, a welding machine, and a variable diameter positioning device. Each positioner includes a positioner base and a positioner head. A movable platform is mounted on the positioner base via guide rails. The two movable platforms are connected by connecting rods. The positioner head drives the movable platforms to perform translation and lifting. The variable diameter positioning device is mounted on the movable platform and includes an annular fixed seat and multiple racks distributed along its circumference. Each rack is driven radially by an independent micro-motor via gears, and a detachable fixing block is mounted on the rack. Through the independent drive of each micro-motor, the fixing block can adapt to workpieces of different shapes and complete positioning and fixing. The welding method includes three steps: workpiece loading and resetting, variable diameter positioning, and welding. This invention achieves fully automated positioning for straight conduit welding, reduces tack welding steps, and improves welding accuracy and efficiency.

Description

Technical Field

[0001] This invention relates to the field of aviation pipeline welding technology, specifically to an automatic argon arc welding device and method for straight conduit without tack welding. Background Technology

[0002] Currently, before welding, automatic welding robots require welding workers to perform tack welding. Then, the tack welded pipe fittings are loaded onto a three-jaw chuck and fixed. By rotating the three-jaw chuck, the welding torch is made to circle the weld seam to complete the welding process. However, the three-jaw chuck is prone to scratching the outer surface of pipe fittings, and the three-jaw chuck requires manual positioning. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic argon arc welding device and method for straight conduits that does not require tack welding, which saves workers from the tack welding process and avoids scratches on the outer surface of pipeline parts caused by the three-jaw chuck.

[0004] To achieve the above objectives, the present invention employs the following technical solution: An automatic argon arc welding device for straight conduit without tack welding includes a positioner, a welding machine, and a variable diameter positioning device; A pair of positioners are spaced apart, each positioner including a positioner base and a positioner head; guide rails are installed on both sides of the upper surface of the positioner base, and a movable platform with lifting function is installed on the guide rails. The positioner head is driven to the movable platform, and the positioner head drives the movable platform to execute translation and lifting mechanical commands along the guide rails; a connecting rod is provided between the two movable platforms installed on the pair of positioner bases to connect the two movable platforms on both sides into a whole; The welding machine is installed between two positioners and is used to perform argon arc welding on the workpiece to be welded. Each movable platform is equipped with one of the aforementioned variable diameter positioning devices for automatic positioning and fixing of the workpiece to be welded. The variable diameter positioning device includes an annular fixed seat, multiple racks, multiple gears, multiple rotating shafts, multiple micro motors, multiple connecting seats, and multiple fixing blocks. The annular fixed seat is fixed to the movable platform. Multiple radially arranged slots are distributed on the circumference of the annular fixed seat, and a rack is fitted in each slot, allowing the rack to move radially along the annular fixed seat. Connecting seats corresponding to the racks are distributed on the inner ring of the annular fixed seat, and a micro motor is installed on each connecting seat. The micro motor is driven by a corresponding gear through a rotating shaft, and each gear is driven by a rack. A detachable fixing block is installed on each rack, and the fixing block moves with the rack. A micro motor drives a rotating shaft to rotate, which in turn drives a gear to rotate. The gear then drives a rack to move radially, which in turn drives a fixed block to move. This causes each fixed block to fit tightly against the outer surface of the workpiece to be welded, thus completing the positioning and fixing of the workpiece.

[0005] Furthermore, the slot is used to circumferentially limit the rack, so that the rack can only move radially.

[0006] Furthermore, the portion of the fixing block that contacts the workpiece to be welded is designed to fit the surface of the workpiece.

[0007] Furthermore, the fixing block adopts a fan-shaped or triangular structure, and the part of the fixing block that contacts the workpiece to be welded is pointed, arc-shaped, or blunt round.

[0008] Furthermore, each rack is driven by an independent micro motor, and the driving stroke of different micro motors can be different; when there is a concave part on the outer surface of the workpiece to be welded, when the fixing block at other positions has already contacted the outer surface of the workpiece to be welded, the fixing block corresponding to the concave part is driven by its micro motor until it contacts the concave part; by controlling different micro motors, the fixing position of the workpiece to be welded can be adjusted within a certain range.

[0009] Furthermore, the welding machine is an automated welding robot.

[0010] An automated argon arc welding method for straight conduits without tack welding includes the following steps: Step 1, workpiece loading and resetting: Reset the variable diameter positioning devices on both movable platforms, driving all fixed blocks to a position away from the center of the annular fixed seat; place the workpiece to be welded on one movable platform, allowing it to pass through the annular fixed seat of the variable diameter positioning device on that movable platform, and then, guided by the connecting rod, pass the workpiece to be welded through the annular fixed seat on the other movable platform; then, use the positioner head to drive the movable platform along the guide rail to adjust, executing translation and lifting mechanical commands to move the workpiece to the appropriate welding position; Step 2, Variable diameter positioning: The variable diameter positioning device automatically positions the workpiece to be welded; a micro motor drives the rotating shaft to rotate, the rotating shaft drives the gear to rotate, the gear drives the rack to move radially, and the rack drives the fixed blocks to move, so that each fixed block is in close contact with the outer surface of the workpiece to be welded, completing the initial clamping and fixing of the workpiece to be welded; then, by adjusting the different micro motors, the position and posture of the workpiece to be welded are finely adjusted. Step 3, Welding: After the workpiece to be welded is positioned and fixed, the welding machine performs argon arc welding on the workpiece; during the welding process, the fixed position and posture of the workpiece to be welded are adjusted to different degrees by means of the positioner head and the micro motor.

[0011] Furthermore, in step two, the method for fine-tuning the workpiece to be welded is as follows: a micro motor drives one side of the fixed block to move backward and the other side of the fixed block to push forward, so as to adjust the position of the workpiece to be welded within a small range; the variable diameter positioning devices on both sides are fixed in different positions to adjust the fixed posture of the workpiece to be welded.

[0012] Furthermore, for circular workpieces to be welded, after all the fixing blocks of the variable diameter positioning devices on both sides are reset, all the micro motors on both sides are driven synchronously at the same speed and stroke to achieve automatic centering and fixing of the workpieces to be welded.

[0013] Compared with the prior art, the present invention has the following technical features: 1. This invention features fully automated positioning throughout the entire process. It adopts a variable diameter positioning design, which can automatically achieve positioning with an accuracy of ±0.05mm, reducing the welding process of parts by 30%.

[0014] 2. Variable diameter positioning enables the self-centering function of the catheter, eliminating positioning errors caused by the bending moment generated by the catheter's own weight on the chuck.

[0015] 3. The pipe welding process has been restructured through the innovation of positioning-free technology, and has been applied on a large scale in high-end manufacturing fields such as aerospace fuel pipelines, promoting the industry's transformation and upgrading from experience-driven processes to data-driven intelligent manufacturing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the planar structure of the variable diameter positioning device of the present invention; Figure 3 This is a partial structural schematic diagram of the variable diameter positioning device of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Positioner, 2. Welding machine, 3. Positioner base, 4. Positioner head, 5. Guide rail, 6. Movable platform, 7. Connecting rod, 8. Variable diameter positioning device, 9. Annular fixed seat, 10. Rack, 11. Gear, 12. Rotating shaft, 13. Micro motor, 14. Connecting seat, 15. Fixing block, 16. Workpiece to be welded. Detailed Implementation

[0018] like Figures 1 to 3 As shown, this invention provides an automatic argon arc welding device for straight conduits that eliminates the need for tack welding. The device mainly comprises three parts: a positioner 1, a welding machine 2 (automatic welding robot), and a variable diameter positioning device 8. Through the variable diameter positioning design, it achieves automated positioning and clamping of the workpiece to be welded, eliminating the need for manual tack welding operations and enabling automatic argon arc welding of straight conduits.

[0019] 1. Positioner

[0020] The positioner 1 is used to carry the workpiece 16 to be welded and to adjust its position and attitude. The positioner 1 specifically includes a positioner base 3 and a positioner head 4. The positioner base 3 is the supporting foundation of the entire device, and a pair is provided. Guide rails 5 are installed on both sides of the upper surface of each positioner base 3. A movable platform 6 with lifting function is installed on the guide rail 5. The movable platform 6 can move along the guide rail 5. The positioner head 4 is connected to the movable platform 6 by transmission. The positioner head 4 drives the movable platform 6 to execute mechanical commands such as translation and lifting along the guide rail 5, thereby driving the workpiece 16 to be welded to adjust its position and attitude.

[0021] A connecting rod 7 is provided between the two movable platforms 6 installed on the pair of displacement bases 3. The connecting rod 7 connects the two movable platforms 6 on both sides into a whole, ensuring the synchronicity and stability of the movement of the two movable platforms 6.

[0022] II. Welding machine 2.

[0023] Welding machine 2 (automatic welding robot) is installed between two positioners 1 and is used to perform argon arc welding on the workpiece 16 to be welded.

[0024] III. Variable diameter positioning device 8.

[0025] The variable diameter positioning device 8 is the core component of this invention. It is installed on each movable platform 6 and is used for automatic positioning and fixing of the workpiece 16 to be welded. The variable diameter positioning device 8 includes an annular fixed seat 9, a rack 10, a gear 11, a rotating shaft 12, a micro motor 13, a connecting seat 14, and a fixing block 15.

[0026] The annular fixed base 9 is fixed on the movable platform 6, serving as the mounting base for the entire variable diameter positioning device 8. Multiple radially arranged slots are distributed around the circumference of the annular fixed base 9, each slot housing a rack 10, allowing the rack 10 to move radially along the annular fixed base 9. The slots can be T-slots or dovetail slots, serving to limit the circumferential movement of the rack 10. Each rack 10 is equipped with a detachable fixing block 15. The specific structure of the fixing block 15 can be selected based on the workpiece 16 to be fixed; for example... Figure 2 In the embodiments, each fixing block 15 adopts a fan-shaped structure; a triangular structure or the like can also be adopted; the contact part of the fixing block 15 with the workpiece 16 to be welded can be designed to be adapted to the surface of the workpiece 16 to be welded, such as a pointed, arc-shaped or blunt round shape; in order to avoid damage to the surface of the workpiece 16 to be welded, the contact part can be a rubber structure.

[0027] Connecting seats 14, corresponding to the positions of rack 10, are distributed on the inner ring of the annular fixed seat 9 to provide support and positioning for the rotating shaft 12; micro motors 13 are mounted on the connecting seats 14; each micro motor 13 is connected to a gear 11 via the rotating shaft 12, and each gear 11 is connected to a rack 10 via the rotating shaft 12.

[0028] The positioning and fixing process of the variable diameter positioning device 8 is as follows: The micro motor 13 drives the rotating shaft 12 to rotate, the rotating shaft 12 drives the gear 11 to rotate, the gear 11 drives the rack 10 meshing with it to move horizontally, the rack 10 moves horizontally, thereby driving the fixing block 15 fixedly connected to the rack 10 to move, so that each fixing block 15 is radially gathered towards the center and closely attached to the outer surface of the workpiece 16 to be welded, thus completing the positioning and fixing of the workpiece 16 to be welded; each rack 10 is driven by an independent micro motor 13. The advantage of this design is that different motors can have different drive strokes. Thus, for some workpieces 16 with non-circular shapes, the independent micro motors can drive different strokes. The machine 13 can drive the fixing blocks 15 of different parts to fit against the surface of the workpiece 16 to be welded, thus playing an effective positioning and fixing role. For example, when there is a concave part on the outer surface of the workpiece 16 to be welded, when the fixing blocks 15 in other positions have already contacted the surface of the workpiece 16 to be welded, the fixing block 15 corresponding to the concave part can be driven by its micro motor 13 until it contacts the concave part, thereby achieving the purpose of tightly contacting and fixing the workpiece 16 to be welded with different shapes. In addition, by using an independent micro motor 13, the fixing position of the workpiece 16 to be welded can be adjusted within a certain range by controlling different micro motors 13, which can better adapt to the welding process.

[0029] Through the above-mentioned variable diameter positioning design, this device can automatically adapt to straight conduit type or other shaped workpieces of different diameters, realize automatic positioning and self-centering functions, and achieve a positioning accuracy of ±0.05mm, eliminating the positioning error caused by the bending moment generated by the self-weight of the conduit.

[0030] Part Two: Automatic TIG Welding Method for Straight Conduit Without Tack Welding

[0031] Based on the above welding apparatus, the present invention also provides an automatic argon arc welding method for straight conduits without tack welding, specifically including the following steps: Step 1: Loading and adjusting the workpiece.

[0032] First, reset the variable diameter positioning devices 8 on both movable platforms 6, that is, drive all the fixed blocks 15 to a position away from the center of the annular fixed seat 9, leaving space for the workpiece 16 to be welded to pass through; then place the workpiece 16 to be welded on one side of the movable platform 6, first let the workpiece 16 to be welded pass through the annular fixed seat 9 of the variable diameter positioning device 8 on the movable platform 16, and then, under the guidance of the connecting rod 7, let the workpiece 16 to be welded pass through the annular fixed seat 9 on the other side of the movable platform 6; then use the positioner head 4 to drive the movable platform 6 to adjust along the guide rail 5, execute mechanical commands such as translation and lifting, so that the workpiece 16 to be welded is moved to a suitable welding position.

[0033] Step 2, variable diameter positioning.

[0034] The variable diameter positioning device 8 automatically positions the workpiece 16 to be welded. Specifically, a micro motor 13 drives a rotating shaft 12 to rotate, which in turn drives a gear 11 to rotate. The gear 11 then drives a rack 10 to move horizontally, which in turn moves the fixing blocks 15 that are fixedly connected to the rack 10. This ensures that each fixing block 15 is in close contact with the outer surface of the workpiece 16 to be welded, thus completing the initial clamping and fixing of the workpiece 16. Subsequently, the position and orientation of the workpiece 16 to be welded are finely adjusted by adjusting the different micro motors 13. For example, the micro motor 13 can drive one fixing block 15 to move backward while the other fixing block 15 is pushed forward to adjust the position of the workpiece 16 within a small range. The fixed positions of the variable diameter positioning devices 8 on both sides of the workpiece 16 to be welded can be different, thereby adjusting its fixed orientation.

[0035] For a circular workpiece 16 to be welded, after all the fixing blocks 15 of the variable diameter positioning devices 8 on both sides are reset, all the micro motors 13 on both sides are driven synchronously at the same speed and stroke, so that the workpiece 16 to be welded can be automatically centered (i.e., the axis of the workpiece 16 to be welded is coaxial with the annular fixing seat 9 after fixing).

[0036] Step 3, welding.

[0037] After the workpiece 16 to be welded is positioned and fixed, the welding machine 2 performs argon arc welding on the workpiece 16 to be welded. During the welding process, the fixed position and posture of the workpiece 16 to be welded can be adjusted to different degrees by means of the positioner head 4 and the micro motor 13, which effectively improves the welding accuracy and efficiency.

[0038] By combining the aforementioned device and method, this invention achieves fully automated positioning for straight conduit welding. Employing a variable diameter positioning design, it automatically achieves positioning with an accuracy of ±0.05mm, reducing the number of tack welding steps and decreasing the overall welding process by 30%. The variable diameter positioning enables self-centering of the conduit, eliminating positioning errors caused by the bending moment generated by the conduit's own weight on the chuck. This innovative positioning-free technology restructures the conduit welding process and has already achieved large-scale application in high-end manufacturing fields such as aerospace fuel pipelines, driving the industry's transformation and upgrading from experience-driven processes to data-driven intelligent manufacturing.

[0039] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An automatic argon arc welding device for straight conduits without tack welding, characterized in that, It includes a positioner (1), a welding machine (2), and a variable diameter positioning device (8); A pair of positioners (1) are spaced apart. Each positioner (1) includes a positioner base (3) and a positioner head (4). Guide rails (5) are installed on both sides of the upper surface of the positioner base (3). A movable platform (6) with lifting function is installed on the guide rails (5). The positioner head (4) is connected to the movable platform (6) by transmission. The positioner head (4) drives the movable platform (6) to perform translation and lifting mechanical commands along the guide rails (5). A connecting rod (7) is provided between the two movable platforms (6) installed on the pair of positioner bases (3) to connect the two movable platforms (6) on both sides into a whole. The welding machine (2) is installed between two positioners (1) and is used to perform argon arc welding on the workpiece (16) to be welded. Each movable platform (6) is equipped with a variable diameter positioning device (8) for automatically positioning and fixing the workpiece (16) to be welded; the variable diameter positioning device (8) includes an annular fixed seat (9), multiple racks (10), multiple gears (11), multiple rotating shafts (12), multiple micro motors (13), multiple connecting seats (14), and multiple fixing blocks (15); the annular fixed seat (9) is fixed on the movable platform (6), and multiple radially arranged slots are distributed on the circumference of the annular fixed seat (9), each slot is equipped with a Each rack (10) is radially movable along the annular fixed seat (9); the inner ring of the annular fixed seat (9) has connecting seats (14) corresponding to each rack (10), and each connecting seat (14) is equipped with a micro motor (13); the micro motor (13) is connected to the corresponding gear (11) through a rotating shaft (12), and each gear (11) is connected to a rack (10); each rack (10) is equipped with a detachable fixing block (15), and the fixing block (15) moves together with the rack (10); The micro motor (13) drives the rotating shaft (12) to rotate, the rotating shaft (12) drives the gear (11) to rotate, the gear (11) drives the rack (10) to move radially, and the rack (10) drives the fixed block (15) to move, so that each fixed block (15) is in close contact with the outer surface of the workpiece (16) to be welded, thus completing the positioning and fixing of the workpiece (16) to be welded.

2. The automatic argon arc welding device for non-positioning welded straight conduits according to claim 1, characterized in that, The slot is used to circumferentially limit the rack (10), so that the rack (10) can only move radially.

3. The automatic argon arc welding device for non-positioning welded straight conduits according to claim 1, characterized in that, The contact portion of the fixing block (15) with the workpiece (16) to be welded is designed to be adapted to the surface of the workpiece (16).

4. The automatic argon arc welding device for non-positioning welded straight conduits according to claim 3, characterized in that, The fixing block (15) adopts a fan-shaped structure or a triangular structure, and the part of the fixing block (15) that contacts the workpiece (16) to be welded is pointed, arc-shaped or blunt round.

5. The automatic argon arc welding device for non-positioning welded straight conduits according to claim 1, characterized in that, Each rack (10) is driven by an independent micro motor (13), and the driving stroke of different micro motors (13) can be different. When there is a concave part on the outer surface of the workpiece (16) to be welded, when the fixing block (15) at other positions has already contacted the outer surface of the workpiece (16), the fixing block (15) corresponding to the concave part is driven by its micro motor (13) until it contacts the concave part. By controlling different micro motors (13), the fixed position of the workpiece (16) to be welded can be adjusted within a certain range.

6. The automatic argon arc welding device for non-positioning welded straight conduits according to claim 1, characterized in that, The welding machine (2) is an automatic welding robot.

7. An automatic argon arc welding method for straight conduits without tack welding, characterized in that, Using the welding apparatus as described in any one of claims 1 to 6, the steps include: Step 1, workpiece loading and resetting: Reset the variable diameter positioning device (8) on both movable platforms (6) and drive all fixed blocks (15) to a position away from the center of the annular fixed seat (9); place the workpiece (16) to be welded on one side of the movable platform (6) so that the workpiece (16) to be welded passes through the annular fixed seat (9) of the variable diameter positioning device (8) on the movable platform (6), and then, under the guidance of the connecting rod (7), pass the workpiece (16) to be welded through the annular fixed seat (9) on the other side of the movable platform (6); then use the positioner head (4) to drive the movable platform (6) to adjust along the guide rail (5), execute the translation and lifting mechanical commands, and move the workpiece (16) to the appropriate welding position; Step 2, Variable diameter positioning: The variable diameter positioning device (8) automatically positions the workpiece (16) to be welded; the micro motor (13) drives the rotating shaft (12) to rotate, the rotating shaft (12) drives the gear (11) to rotate, the gear (11) drives the rack (10) to move radially, and the rack (10) drives the fixed block (15) to move, so that each fixed block (15) is in close contact with the outer surface of the workpiece (16) to be welded, thus completing the initial clamping and fixing of the workpiece (16); then, by adjusting the different micro motors (13), the position and posture of the workpiece (16) to be welded are finely adjusted. Step 3, Welding: After the workpiece (16) is positioned and fixed, the welding machine (2) performs argon arc welding on the workpiece (16). During the welding process, the fixed position and posture of the workpiece (16) are adjusted to different degrees by the cooperation of the positioner head (4) and the micro motor (13).

8. The automatic argon arc welding method for straight conduits without tack welding according to claim 7, characterized in that, In step two, the method for fine-tuning the workpiece (16) to be welded is as follows: a micro motor (13) drives the fixed block (15) on one side to move backward and the fixed block (15) on the other side to push forward, so as to adjust the position of the workpiece (16) to be welded within a small range; the variable diameter positioning devices (8) on both sides are fixed in different positions on the workpiece (16) to be welded, thereby adjusting its fixed posture.

9. The automatic argon arc welding method for straight conduits without tack welding according to claim 7, characterized in that, For a circular workpiece (16) to be welded, after all the fixing blocks (15) of the variable diameter positioning devices (8) on both sides are reset, all the micro motors (13) on both sides are driven at the same speed and stroke to realize the automatic centering and fixing of the workpiece (16) to be welded.

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