A welding fixture for flange processing

Abstract

This invention provides a welding fixture for flange processing, relating to the field of processing fixture technology. It includes a fixture base, a flange, and a bend. The fixture base has two sets of positioning components inside, each with a second positioning frame. Each second positioning frame has an upper positioning rod fixedly mounted on its top. The flange is mounted on the two upper positioning rods. A lifting frame is installed at the center of the fixture base to mount the flange on the two upper positioning rods. Then, two positioning chambers are activated to fix the flange and bend inside. Subsequently, two clamping plates on the sides of the two side clamping arms clamp and fix the bend. This triple positioning and fixing provides stable positioning for the flange and bend, reducing manual intervention during subsequent welding. Furthermore, the drive base can rotate the fixture base, allowing for full-circle welding of the flange and bend, improving welding efficiency.

Description

Technical Field

[0001] This invention belongs to the field of machining fixture technology, and more specifically, relates to a welding fixture for flange machining. Background Technology

[0002] In the field of welding pipe connection components, traditional welding methods have many problems, which seriously affect welding quality, efficiency and versatility, and urgently need to be improved.

[0003] Currently, the welding of flanges and bends largely relies on manual positioning and fixing. Manual operation is not only labor-intensive but also difficult to guarantee positioning accuracy. Due to the lack of precise positioning devices, flanges and bends are prone to misalignment during welding, leading to uneven welds and welding defects such as porosity and cracks. This significantly reduces the strength and reliability of the welded joint, affecting the overall sealing and service life of the pipeline system. The risks posed by this traditional welding method are particularly pronounced for pipeline systems in industries with extremely high sealing requirements, such as chemical and gas pipelines.

[0004] Conventional clamping and fixing methods often apply external pressure, making it difficult to accurately align the flange bolt holes. During the fixing process, positional deviations can easily occur, causing the welded flange to become misaligned or non-coaxial with the pipe, resulting in an inability to achieve a tight seal and increasing the risk of leakage. Furthermore, this fixing method is not effective for different types of flanges. For flanges with varying bolt hole positions, numbers, and sizes, operators must rely on experience to make adjustments, which is complex, time-consuming, and severely impacts production efficiency.

[0005] Traditional welding equipment lacks multi-axis positioning capabilities, allowing it to position welded components only in a single or limited dimension. It cannot accurately calibrate the relative positions of flanges and bends across multiple dimensions, failing to meet the high-precision welding demands of modern industry. Furthermore, traditional equipment struggles to achieve precise alignment when dealing with bends of varying shapes, resulting in inconsistent weld quality.

[0006] Furthermore, traditional welding processes lack effective methods for centering the welded components. This makes it impossible to guarantee the concentricity and perpendicularity of the flange and bend, further affecting weld quality and sealing performance. Moreover, during welding, components are prone to gaps due to vibration, which is difficult to monitor and adjust manually in real time, resulting in poor weld outcomes.

[0007] In summary, existing flange and bend welding technologies have significant shortcomings in terms of positioning accuracy, fixing methods, multi-axis positioning capabilities, center positioning, and welding stability, and cannot meet the demands of modern industry for efficient, high-precision, and high-quality welding. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a welding fixture for flange processing.

[0009] A welding fixture for flange processing includes a fixture base, a flange, and a bend. The fixture base has two sets of positioning components inside to position the flange. Each set of positioning components contains a second positioning frame. Each second positioning frame has an upper positioning rod fixedly mounted on its top. The flange is mounted outside the two upper positioning rods. A lifting frame is installed at the center of the fixture base. Two positioning chambers are located above the lifting frame. Each positioning chamber contains a strip-shaped tooth for fixing the bend. Two arc-shaped supports are fixedly mounted on the side walls of each fixture base. Side clamping arms are rotatably mounted on the side walls of the two arc-shaped supports. Clamping plates are provided on the opposite faces of the two side clamping arms. The bend is fixed between the two clamping plates.

[0010] Preferably, an upper positioning rod is fixedly installed on the top of each second positioning frame, and a first threaded sleeve and a second threaded sleeve are threadedly installed on the surface of each upper positioning rod. The two sides of the flange are fixed between the first threaded sleeve and the second threaded sleeve. The positioning component includes a first drive motor, a first positioning frame, and a second drive motor. The first drive motor is fixed inside the fixture chassis, and the threaded rod at the end of the first drive motor passes through the first positioning frame. A first support rod is slidably installed inside the first positioning frame above the first drive motor, and the end of the first support rod is fixedly connected to the fixture chassis. The second drive motor is fixed inside the first positioning frame, and a second support rod is fixedly installed on the side wall of the first positioning frame below the second drive motor. The threaded rod at the end of the first positioning frame passes through the second positioning frame, and the second positioning frame is slidably installed on the second support rod.

[0011] Preferably, a fixed frame is fixedly installed at the bottom of the clamp chassis. Two third drive motors are fixedly installed inside the fixed frame. The threaded rods at the ends of the two third drive motors both extend through the lifting frame. An electric motor is fixedly installed inside the lifting frame. An internal gear is installed at the center of the two positioning chambers. Two opposing-oriented strip teeth are installed inside each positioning chamber. An airbag is fixedly installed at the end of each of the two strip teeth, and both airbags face outward from the positioning chamber. The output shaft of each electric motor is fixedly connected to the internal gear in the two upper positioning chambers. A connecting pipe is fixedly installed between the two lifting frames. The lower positioning chamber is fixedly connected to the lifting frame.

[0012] Preferably, a first bridge-shaped frame is fixedly installed below the two side clamping arms, and a second bridge-shaped frame is fixedly installed on the side walls of the two rotating shaft frames. The first and second bridge-shaped frames are parallel to each other. Springs are fixedly installed between the two ends of the first and second bridge-shaped frames. A fifth drive motor is fixedly installed below the first bridge-shaped frame, and a threaded rod below the fifth drive motor passes through the second bridge-shaped frame. Rubber plates are fixedly installed on the side walls of the two clamping plates, and conical pads are fixedly installed on the side walls of the two rubber plates. The two conical pads are in contact with the side wall of the bent pipe. A fourth drive motor and two sliding rods are fixedly installed on the side walls of the two clamping plates near the side clamping arms. The threaded rod of the output shaft of the fourth drive motor passes through the side clamping arm, and each sliding rod is slidably connected to the side clamping arm.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, during use, two sets of positioning components are activated, driving two second positioning frames to the bottom of the flange. The movement of the two second positioning frames moves the upper positioning rods to the bottom of the bolts on both sides of the flange. After successful positioning, the flange is installed on the two upper positioning rods. Then, the two positioning chambers are activated to fix the flange and the inside of the bend. Subsequently, the two clamping plates on the sides of the two side clamping arms clamp and fix the bend. By adopting triple positioning and fixing, the flange and bend can be stably positioned. During subsequent welding, manual intervention is reduced, and the drive base can drive the fixture base to rotate, allowing for full-circle welding of the flange and bend, thus improving the efficiency of flange and bend welding.

[0015] In this invention, when positioning the flange, a first drive motor and a second drive motor are activated. The first drive motor operates by driving a first positioning frame to slide horizontally on a first support rod via a threaded rod. The second drive motor starts by driving a second positioning frame to slide horizontally on a second support rod via a threaded rod. At this time, the second positioning frame can move in multiple positions on the X and Z axes, thereby achieving precise positioning based on the position of the flange bolt holes. This allows for the application of different types of flanges and improves positioning accuracy. Multi-axis positioning can accurately calibrate the relative position of the flange and the bend from multiple dimensions. Precise positioning reduces positional deviations during welding, resulting in uniform and well-formed welds, effectively reducing the probability of defects such as porosity and cracks. The fixed flange does not wobble during welding, reducing thermal deformation, avoiding stress concentration, enhancing the strength and reliability of the weld joint, and extending the service life of the equipment. It is especially suitable for pipeline systems with high sealing requirements.

[0016] In this invention, each upper positioning rod has a first threaded sleeve and a second threaded sleeve threadedly installed on its surface. The two sides of the flange are fixed between the first threaded sleeve and the second threaded sleeve. In use, the second threaded sleeve on the upper positioning rod is first rotated off, and the first threaded sleeve is threadedly connected to the upper positioning rod. The height of the lower first threaded sleeve is adjusted according to the thickness and height of the flange and the bend. The flange is then installed on the two upper positioning rods. Subsequently, the second threaded sleeve is rotated back onto the upper positioning rod. The first threaded sleeve and the second threaded sleeve clamp and fix the flange from above and below. By using the bolt holes of the flange for positioning and fixing, a high degree of concentricity between the two can be ensured. This can effectively avoid problems such as misalignment and misalignment between the flange and the pipe after welding, improve welding quality, ensure tight sealing surface, and reduce the risk of leakage. Conventional clamping and fixing mostly apply external pressure, which makes it difficult to accurately align the bolt hole positions and is prone to positional deviation, affecting subsequent assembly and sealing performance.

[0017] In this invention, after the flange position is fixed, the lower opening of the bend is aligned with the upper opening of the flange. Then, the fourth drive motors on the back of the two clamping plates are activated. The two fourth drive motors drive the two clamping plates to clamp the side wall of the bend through threaded rods. The two clamping plates drive the rubber plate and the conical pad to clamp and fix the side wall of the bend. The two clamping plates are independently configured and can be used for bends of different shapes, thereby further improving the alignment accuracy between the flange and the bend. After the clamping plates fix the bend, the bend can be stably connected to the flange.

[0018] In this invention, after the flange and bend are joined, two third drive motors within the fixing frame are activated. These motors, via threaded rods, drive the lifting frame upwards. This upward movement of the lifting frame causes two positioning chambers to move upwards. The upper positioning chamber moves to the bottom of the bend, extending beyond its opening, while the lower positioning chamber moves to near the upper opening of the flange. At this point, the motors are activated, and their output shafts drive two internal gears to rotate. This rotation of the internal gears moves two opposing strip teeth on either side, which in turn move two airbags. The four airbags then fit against the inner walls of the bend and flange, respectively. At this point, the flange and bend are successfully centered, and the airbags possess a certain degree of resilience, which can reduce the impact of the flange's position. The error between the flange and the inner wall of the bend can be accurately calibrated by center positioning to ensure the concentricity and perpendicularity of the flange and the bend. This allows the flange sealing surface to fit tightly against the bend, effectively preventing media leakage. It is especially suitable for pipeline systems with high sealing requirements (such as chemical and gas pipelines), avoiding sealing failure or operational malfunctions caused by positional deviations. The positioning mechanism can quickly and accurately fix the flange and bend, reducing the time spent on repeated manual adjustments. Especially in mass production, standardized positioning operations can significantly improve overall efficiency. In addition, automated or semi-automated positioning mechanisms reduce the labor intensity of workers, eliminating the need for them to spend a lot of energy on manual centering.

[0019] In this invention, after the flange and the bend are positioned and connected, the fifth drive motor is started. The threaded rod of the fifth drive motor cooperates with the second bridge frame, and the first bridge frame moves downward. The first bridge frame moves downward (here, the first bridge frame is subject to the elastic force of two springs and can only be finely adjusted downward), which drives the two side clamping arms to move downward. This ensures that the lower opening of the bend is always closed with the upper opening of the flange, avoiding gaps during welding and reducing gaps caused by vibration during welding. The first and second bridge frames cooperate to perform downward fine-tuning, which can further cooperate with the two positioning chambers to achieve better positioning and docking. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the fixture chassis structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the first positioning frame structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the flange structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the second positioning frame structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the lifting frame structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal gear structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the clamping plate structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the rotating shaft frame structure of the present invention;

[0028] Figure 9 This is a schematic diagram of the side clamping arm structure of the present invention.

[0029] In the figure, the correspondence between the component names and the attached drawing numbers is as follows: 1. Fixture base; 11. Drive base; 12. First drive motor; 13. First support rod; 14. First positioning frame; 15. Second drive motor; 16. Second support rod; 17. Second positioning frame; 18. Upper positioning rod; 19. First threaded sleeve; 2. Flange; 21. Bend; 22. Fixing frame; 23. Third drive motor; 24. Lifting frame; 25. Electric motor; 26. Positioning chamber; 27. Internal gear; 28. Airbag; 29. ​​Strip tooth; 3. Second threaded sleeve; 31. Spring; 32. Rotary shaft frame; 33. Arc-shaped bracket; 34. Side clamping arm; 35. Clamping plate; 36. Rubber plate; 37. Conical pad; 38. Fourth drive motor; 39. Slide rod; 4. First bridge frame; 41. Second bridge frame; 42. Fifth drive motor; 43. Connecting pipe. Detailed Implementation

[0030] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0031] Please see Figures 1-9This invention provides a welding fixture for flange processing, comprising a fixture base 1, a flange 2, and a bend 21. The fixture base 1 has two sets of positioning components inside to position the flange 2. A drive base 11 is located below the fixture base 1, and a motor inside the drive base 11 drives the fixture base 1 to rotate as a whole. Each set of positioning components contains a second positioning frame 17, and an upper positioning rod 18 is fixedly installed on the top of each second positioning frame 17. The flange 2 is mounted outside the two upper positioning rods 18. A lifting frame 24 is installed at the center of the fixture base 1, and two positioning chambers 26 are located above the lifting frame 24. Each positioning chamber 26 contains strip teeth 29 for fixing the bend 21. Two arc-shaped supports 33 are fixedly installed on the side walls of each fixture base 1, and side clamping arms 34 are rotatably installed on the side walls of the two arc-shaped supports 33. The two side clamping arms 34 are positioned relative to each other. Each side is equipped with a clamping plate 35. The bent pipe 21 is fixed between two clamping plates 35. In use, two sets of positioning components are activated. The two sets of positioning components drive two second positioning frames 17 to the bottom of the flange 2. The movement of the two second positioning frames 17 drives the upper positioning rods 18 to the bottom of the bolts on both sides of the flange 2. After successful positioning, the flange 2 is installed on the two upper positioning rods 18. Then, the two positioning chambers 26 are activated to fix the flange 2 and the inside of the bent pipe 21. Then, the two clamping plates 35 on the sides of the two side clamping arms 34 clamp and fix the bent pipe 21. By adopting triple positioning and fixing, the flange 2 and the bent pipe 21 can be positioned stably. In subsequent welding, manual intervention is reduced. The drive base 11 can drive the fixture base 1 to rotate, which can perform full-circle welding on the flange 2 and the bent pipe 21, improving the welding efficiency of the flange 2 and the bent pipe 21.

[0032] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4The positioning component includes a first drive motor 12, a first positioning frame 14, and a second drive motor 15. The first drive motor 12 is fixed inside the fixture base 1, and the threaded rod at the end of the first drive motor 12 extends through the first positioning frame 14. A first support rod 13 is slidably installed inside the first positioning frame 14 above the first drive motor 12, and the end of the first support rod 13 is fixedly connected to the fixture base 1. The second drive motor 15 is fixed inside the first positioning frame 14. A second support rod 16 is fixedly installed on the side wall of the first positioning frame 14 below the second drive motor 15, and the threaded rod at the end of the first positioning frame 14 extends through the second positioning frame 17. Positioning bracket 17 is slidably mounted on the second support rod 16. When positioning the flange 2, the first drive motor 12 and the second drive motor 15 are activated. The first drive motor 12 drives the first positioning bracket 14 to slide horizontally on the first support rod 13 via a threaded rod. The second drive motor 15 drives the second positioning bracket 17 to slide horizontally on the second support rod 16 via a threaded rod. At this time, the second positioning bracket 17 can move in multiple positions along the X and Z axes, thus enabling precise positioning based on the position of the bolt holes of the flange 2. This allows for the application of different types of flanges 2, improving positioning accuracy. Multi-axis positioning can precisely calibrate the relative position of the flange 2 and the bend 21 from multiple dimensions. Precise positioning reduces positional deviations during welding, resulting in uniform and well-formed welds. This effectively reduces the probability of defects such as porosity and cracks. The fixed flange 2 does not wobble during welding, reducing thermal deformation, avoiding stress concentration, enhancing the strength and reliability of the welded joint, and extending equipment lifespan. It is particularly suitable for piping systems with high sealing requirements. Each upper positioning rod 18 has a first threaded sleeve 19 and a second threaded sleeve 3 threadedly installed on its surface. The two sides of the flange 2 are fixed between the first threaded sleeve 19 and the second threaded sleeve 3. During use, the second threaded sleeve 3 on the upper positioning rod 18 is first rotated off, and the first threaded sleeve 19 is threadedly connected to the upper positioning rod 18. Adjust the height of the first threaded sleeve 19 according to the thickness and height of the flange 2 and the elbow 21, and install the flange on the two upper positioning rods 18. Then rotate the second threaded sleeve 3 back onto the upper positioning rods 18. The first threaded sleeve 19 and the second threaded sleeve 3 clamp and fix the flange 2 from the top and bottom. By using the bolt holes of the flange 2 for positioning and fixing, the concentricity of the two can be ensured. This can effectively avoid problems such as misalignment and misalignment between the flange and the pipeline after welding, improve the welding quality, ensure tight sealing surface, and reduce the risk of leakage. Conventional clamping and fixing mostly apply external pressure, which makes it difficult to accurately align the bolt hole positions and is prone to positional deviation, affecting subsequent assembly and sealing performance.

[0033] In this embodiment, as Figure 1 , Figure 7 and Figure 8Rubber plates 36 are fixedly installed on the side walls of both clamping plates 35. Conical pads 37 are fixedly installed on the side walls of both rubber plates 36, and the two conical pads 37 are in contact with the side wall of the bend 21. A fourth drive motor 38 and two sliding rods 39 are fixedly installed on the side walls of the two clamping plates 35 near the side clamping arm 34. The threaded rod of the output shaft of the fourth drive motor 38 passes through the side clamping arm 34. Each sliding rod 39 is slidably connected to the side clamping arm 34. After the flange 2 is fixed in position, the lower opening of the bend 21 is connected to the upper opening of the flange 2. After docking, the fourth drive motors 38 on the back of the two clamping plates 35 are activated. The two fourth drive motors 38 drive the two clamping plates 35 to clamp the side wall of the bend 21 through the threaded rod. The two clamping plates 35 drive the rubber plate 36 and the conical pad 37 to clamp and fix the side wall of the bend 21. The two clamping plates 35 are independently configured and can be used for bends 21 of different shapes, thereby further improving the docking accuracy of the flange 2 and the bend 21. After the clamping plates 35 fix the bend 21, the bend 21 can be stably connected to the flange 2.

[0034] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6A fixed frame 22 is fixedly installed at the bottom of the fixture chassis 1. Two third drive motors 23 are fixedly installed inside the fixed frame 22. The threaded rods at the ends of the two third drive motors 23 both extend through the lifting frame 24. An electric motor 25 is fixedly installed inside the lifting frame 24. An internal gear 27 is installed at the center of each of the two positioning chambers 26. Two opposing-oriented strip teeth 29 are installed inside each positioning chamber 26. An airbag 28 is fixedly installed at the end of each of the two strip teeth 29, and both airbags 28 face outward from the positioning chamber 26. The output shaft of each electric motor 25 is connected to the two above. The internal gear 27 inside the positioning chamber 26 is fixedly connected, and a connecting pipe 43 is fixedly installed between the two lifting frames 24. The lower positioning chamber 26 is fixedly connected to the lifting frame 24. After the flange 2 and the bend 21 are connected, the two third drive motors 23 inside the fixed frame 22 are started. The two third drive motors 23 drive the lifting frame 24 upward through the threaded rod. The upward movement of the lifting frame 24 drives the two positioning chambers 26 upward. The upper positioning chamber 26 moves up to the bottom of the bend 21 and exceeds the opening of the bend 21. The lower positioning chamber 26 moves up to near the upper opening of the flange 2. At this point, the motor 25 is started. The output shaft of the motor 25 drives two internal gears 27 to rotate. The rotation of the two internal gears 27 drives two strip teeth 29 on both sides to move in opposite directions. The movement of the two strip teeth 29 drives two airbags 28 to move. The four airbags 28 respectively fit against the inner wall of the bend 21 and the flange 2. At this time, the flange 2 and the bend 21 are successfully centered. The airbags 28 have a certain degree of toughness, which can reduce the error of the inner wall of the flange 2 and the bend 21. By performing center positioning, the relative position of the flange 2 and the bend 21 can be accurately calibrated, ensuring their concentricity and the flange 2 The perpendicularity of the flange 2 to the bend 21 ensures a tight fit between the flange 2 sealing surface and the bend 21, effectively preventing media leakage. This is especially suitable for pipeline systems with high sealing requirements (such as chemical and gas pipelines), avoiding sealing failure or operational malfunctions caused by positional deviations. The positioning mechanism can quickly and accurately fix the flange 2 and the bend 21, reducing the time spent on repeated manual adjustments and alignment. Especially in mass production, standardized positioning operations can significantly improve overall efficiency. In addition, automated or semi-automated positioning mechanisms reduce the labor intensity of workers, eliminating the need for them to spend a lot of effort on manual alignment.

[0035] In this embodiment, as Figure 1 , Figure 7 , Figure 8 and Figure 9A first bridge-shaped frame 4 is fixedly installed below the two side clamping arms 34, and a second bridge-shaped frame 41 is fixedly installed on the side walls of the two rotating shaft frames 32. The first bridge-shaped frame 4 and the second bridge-shaped frame 41 are parallel vertically. A spring 31 is fixedly installed between both ends of the first bridge-shaped frame 4 and the second bridge-shaped frame 41. A fifth drive motor 42 is fixedly installed below the first bridge-shaped frame 4, and the threaded rod below the fifth drive motor 42 passes through the second bridge-shaped frame 41. After the flange 2 and the bend 21 are positioned and connected, the fifth drive motor 42 is started. The threaded rod of 42 cooperates with the second bridge frame 41. The first bridge frame 4 moves downward. The first bridge frame 4 moves downward (the first bridge frame 4 here is subject to the elastic force of two springs 31 and can only be finely adjusted downward), which drives the two side clamping arms 34 to move downward. This ensures that the lower opening of the bend 21 is always closed with the upper opening of the flange 2, avoiding gaps during welding and reducing gaps caused by vibration during welding. The first bridge frame 4 and the second bridge frame 41 cooperate to perform downward fine adjustment, which can further cooperate with the two positioning chambers 26 to achieve better positioning and docking.

[0036] Among them, the first drive motor 12, the second drive motor 15, the third drive motor 23, the fourth drive motor 38 and the fifth drive motor 42 are all composed of motors and threaded rods, and the threaded rods are fixed on the output shaft of the motors.

[0037] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A welding fixture for flange processing, comprising a fixture base (1), a flange (2), and a bend (21), characterized in that: The fixture chassis (1) is provided with two sets of positioning components for positioning the flange (2). Each set of positioning components is provided with a second positioning frame (17). Each second positioning frame (17) is fixedly mounted with an upper positioning rod (18) on its top. The flange (2) is mounted outside the two upper positioning rods (18). A lifting frame (24) is installed at the center of the fixture chassis (1). Two positioning chambers (26) are provided above the lifting frame (24). Each positioning chamber (26) is provided with a strip tooth (29) for fixing the bent pipe (21). Two arc-shaped brackets (33) are fixedly mounted on the side wall of each fixture chassis (1). Side clamping arms (34) are rotatably mounted on the side wall of each of the two arc-shaped brackets (33). Clamping plates (35) are provided on the opposite surfaces of the two side clamping arms (34). The bent pipe (21) is fixed between the two clamping plates (35). The fixture chassis (1) A fixed frame (22) is fixedly installed at the bottom of the lifting frame (24). Two third drive motors (23) are fixedly installed inside the fixed frame (22). The threaded rods at the ends of the two third drive motors (23) pass through the lifting frame (24). An electric motor (25) is fixedly installed inside the lifting frame (24). An internal gear (27) is installed at the center of the two positioning chambers (26). Two oppositely oriented strip teeth (29) are installed inside each positioning chamber (26). An airbag (28) is fixedly installed at the end of the two strip teeth (29). The two airbags (28) face outward from the positioning chamber (26). The output shaft of each electric motor (25) is fixedly connected to the internal gear (27) in the two upper positioning chambers (26). A connecting pipe (43) is fixedly installed between the two lifting frames (24). The lower positioning chamber (26) is fixedly connected to the lifting frame (24).

2. The welding fixture for flange processing as described in claim 1, characterized in that, Each of the second positioning frames (17) is fixedly mounted with an upper positioning rod (18) on its top. Each upper positioning rod (18) is threaded with a first threaded sleeve (19) and a second threaded sleeve (3). The two sides of the flange (2) are fixed between the first threaded sleeve (19) and the second threaded sleeve (3).

3. The welding fixture for flange processing as described in claim 1, characterized in that, The positioning component includes a first drive motor (12), a first positioning frame (14), and a second drive motor (15). The first drive motor (12) is fixed inside the fixture chassis (1), and the threaded rod at the end of the first drive motor (12) passes through the first positioning frame (14). A first support rod (13) is slidably installed inside the first positioning frame (14) located above the first drive motor (12), and the end of the first support rod (13) is fixedly connected to the fixture chassis (1).

4. The welding fixture for flange processing as described in claim 3, characterized in that, The second drive motor (15) is fixed inside the first positioning frame (14). The second support rod (16) is fixedly installed on the side wall of the first positioning frame (14) located below the second drive motor (15). The threaded rod at the end of the first positioning frame (14) passes through the second positioning frame (17). The second positioning frame (17) is slidably installed on the second support rod (16).

5. The welding fixture for flange processing as described in claim 1, characterized in that, The same first bridge frame (4) is fixedly installed below the two side clamping arms (34), and the same second bridge frame (41) is fixedly installed on the side wall of the two rotating shaft frames (32). A spring (31) is fixedly installed between the two ends of the first bridge frame (4) and the second bridge frame (41). A fifth drive motor (42) is fixedly installed below the first bridge frame (4), and the threaded rod below the fifth drive motor (42) passes through the second bridge frame (41).

6. The welding fixture for flange processing as described in claim 5, characterized in that, Rubber plates (36) are fixedly installed on the side walls of both clamping plates (35), and conical pads (37) are fixedly installed on the side walls of both rubber plates (36), and the two conical pads (37) are in contact with the side wall of the bend (21).

7. The welding fixture for flange processing as described in claim 6, characterized in that, The sidewalls of the two clamping plates (35) near the side clamping arm (34) are fixedly equipped with a fourth drive motor (38) and two slide rods (39). The threaded rod of the output shaft of the fourth drive motor (38) passes through the side clamping arm (34), and each slide rod (39) is slidably connected to the side clamping arm (34).

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