Flange plate welding auxiliary device

Abstract

The invention relates to the technical field of auxiliary welding, and discloses a flange plate welding auxiliary device which is characterized in that a rotating plate is driven by a torsional spring to expand outwards and is matched with a limiting rod to form an inverted-splayed inlet, and four riding wheels II are automatically folded to complete centering when a flange plate is put in due to self weight; in the process, extra power and complex control are not needed, coaxial positioning of the flange plate and the pipe body can be rapidly achieved, it is guaranteed that spot welding and annular welding precision is not affected by manual centering errors, and the consistency and the qualification rate of batch production are remarkably improved. The problems that due to the fact that manual centering, spot welding and transferring are needed in a conventional flat welding process, procedures are dispersed, the coaxiality fluctuates, the batch takt is slow, and the welding efficiency and precision of the flange and the pipe body are difficult to consider at the same time are solved.

Description

Technical Field

[0001] This invention relates to the field of auxiliary welding technology, specifically to an auxiliary device for flange welding. Background Technology

[0002] Circumferential welding of flanges and pipes typically employs two methods: "flat welding" or "sleeve welding." In sleeve welding, the inner diameter of the flange is first fitted onto the outer wall of the pipe, and then welding is performed at the end; therefore, the inner diameter of the flange must be larger than the outer diameter of the pipe. Flat welding requires that the inner diameter of the flange and the outer diameter of the pipe be basically the same, and welding is performed directly after the butt joint.

[0003] In current flat-face welding processes, it is common practice to manually align the flange and pipe body, and tack weld at least two points to create temporary fixation, before transferring it to a positioner or roller frame to complete the circumferential weld. This approach has the following drawbacks: The process is fragmented – the four steps of “centering – spot welding – transfer – circumferential welding” are sequential, resulting in long auxiliary times; Precision fluctuations – manual alignment relies on experience, resulting in large discrepancies in coaxiality, which can easily lead to weld misalignment later on. Efficiency bottleneck – during mass production, repeated clamping and spot welding are required, making it difficult to compress the cycle time.

[0004] Although centering fixtures have been developed to clamp the flange directly to the pipe body and complete the welding, each completed piece requires a "clamp-weld-release-unload" cycle. The high frequency of clamping action and the relatively long auxiliary time make it difficult to meet the demands of continuous, high-speed production. Therefore, there is still room for improvement in the precision and efficiency of the flange-to-pipe flat welding process. Summary of the Invention

[0005] The purpose of this invention is to provide a flange welding auxiliary device that solves the problems of process dispersion, coaxiality fluctuation and slow batch cycle caused by the need for manual centering, spot welding and transfer in conventional flat welding processes, making it difficult to achieve both efficiency and accuracy in flange and pipe welding.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a flange welding auxiliary device, comprising: The operating table has a pair of rotating shafts rotatably mounted on its upper side. The surface of the rotating shafts is equipped with a support roller for lifting the pipe body. The operating table is also equipped with a welding torch for welding the pipe body and the flange. A positioning mechanism is mounted on one side of the operating table. The positioning mechanism coaxially positions the flange at one end of the pipe body. The positioning mechanism includes a support rod, and a centering component is supported at the upper end of the support rod. Side brackets are rotatably mounted on both sides of the centering component. Under normal conditions, the upper end of the side brackets rotates outward, and the two side brackets have an inverted octagonal structure. A pair of rollers are provided on the side of the side brackets near the pipe body. The two rollers are respectively located at both ends of the side brackets. The flange is placed in the middle above the two side brackets. The flange first contacts the second support rollers below the two side brackets and pushes the side brackets to rotate around the axis until the second support rollers above the two side brackets also contact the arc surface of the flange. At this time, the flange and the pipe body are coaxial.

[0007] As a further description of the above technical solution: the side bracket includes a central shaft mounted on one side of the centering component, a rotating plate is rotatably mounted on one side of the central shaft, and the second support roller is rotatably disposed on the side of the rotating plate.

[0008] As a further description of the above technical solution: a torsion spring is provided between the rotating plate and the central shaft. The torsion spring elastically drives the upper end of the rotating plate to rotate outward. A limit rod is also fixedly mounted on the outer surface of the central shaft. The limit rod is used to limit the angle of rotation of the upper end of the rotating plate outward.

[0009] As a further description of the above technical solution: a retaining ring is fixedly sleeved on the side of the second support roller near the rotating plate.

[0010] As a further description of the above technical solution: a positioning block is provided on the upper side of the support rod, and the positioning block is locked to the support rod by a bolt with a side thread connection, and a bearing is also fixedly assembled on one side of the bolt.

[0011] As a further description of the above technical solution: the centering component includes a bidirectional threaded column assembled inside the bearing, the thread structures at both ends of the bidirectional threaded column are opposite, and displacement platforms are threaded to both the upper and lower ends of the bidirectional threaded column. A limiting sleeve is fixedly provided on one side of the displacement platform, the limiting sleeve is movably sleeved on the surface of the support rod, and hinge rods are rotatably connected to both sides of the displacement platform. One end of the hinge rod is hinged to the central shaft through a hinge sleeve seat. The hinge rods on the same side of the two displacement stages are hinged to a central axis.

[0012] As a further description of the above technical solution: a knob is fixedly connected to the upper end of the bidirectional threaded column.

[0013] As a further description of the above technical solution: two nuts are also provided on the bidirectional threaded column, and the two nuts correspond to the two displacement stages.

[0014] As a further description of the above technical solution: an extension frame is fixedly installed on one side of the operating table, the extension frame is located directly below the two rotating shafts, and the support rod is fixedly assembled on the upper side of the extension frame through the mounting seat at the lower end.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The rotating plate is driven to open outward by a torsion spring, forming an inverted octagonal inlet with the help of a limit rod. When the flange is placed in, its own weight automatically retracts the four support rollers to complete the centering. The retaining ring restricts the end face of the flange to keep it vertical. This process can quickly achieve coaxial positioning of the flange and the pipe body without additional power or complex control, ensuring that the accuracy of spot welding and circumferential welding is not affected by human centering errors, and significantly improving the consistency and pass rate of mass production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the invention, including the flange and pipe body. Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram showing the positioning mechanism of the present invention clamping the flange. Figure 4 This is a schematic diagram of the positioning mechanism of the present invention used for clamping one side; Figure 5 This is a schematic diagram of the positioning mechanism of the present invention on the side away from the clamping side; Figure 6 This is a schematic diagram of the side bracket structure of the present invention; Figure 7 This is a schematic diagram of the centering component and strut structure of the present invention.

[0017] In the diagram: 10. Operating table; 11. Rotating shaft; 12. Support roller one; 13. Welding torch; 14. Extension frame; 15. Motor; 20. Positioning mechanism; 21. Side bracket; 211. Rotating plate; 212. Central shaft; 213. Torsion spring; 214. Limit rod; 22. Support roller two; 221. Retaining ring; 23. Centering assembly; 231. Bidirectional threaded column; 232. Displacement table; 233. Hinge rod; 234. Hinge sleeve seat; 235. Nut; 236. Knob; 237. Limit sleeve; 24. Support rod; 241. Positioning block; 242. Bolt; 243. Bearing; 244. Mounting base. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0020] Combination Figures 1-7 A flange welding auxiliary device, comprising: The operating table 10 has a pair of rotating shafts 11 rotatably mounted on its upper side. The distance between the two rotating shafts 11 is fixed. The rotating shafts 11 are preferably rotatably mounted on the upper side of the operating table 10 via bearing assemblies. One end of one of the rotating shafts 11 is connected to a motor 15, and the output end of the motor 15 is coaxially connected to the rotating shaft 11. The surface of the rotating shaft 11 is equipped with rollers 12 for supporting the pipe body. Typically, at least two rollers 12 are provided on the surface of a single rotating shaft 11. The operating table 10 is also equipped with a welding torch 13 for welding the pipe body and the flange. In welding the pipe body and the flange, the pipe body is placed between the two rotating shafts 11 and supported by the rollers 12. Then, the motor 15 is controlled to drive the corresponding rotating shaft 11 to rotate, and the synchronously rotating rollers 12 can drive the pipe body to rotate. In the welding of the pipe body and the flange, the output part of the welding torch 13 is located at the joint of the pipe body and the flange. As the pipe body rotates, the welding torch 13 can weld the circumferential seam between the pipe body and the flange. Positioning mechanism 20 is mounted on one side of operating table 10. Positioning mechanism 20 is responsible for coaxially positioning the flange at one end of the pipe body. Specifically, the positioning mechanism 20 includes a support rod 24, with a centering component 23 supported at the upper end of the support rod 24. During the welding process of the pipe body and the flange, the centering component 23 is located at a fixed position on the surface of the support rod 24. Side brackets 21 are rotatably mounted on both sides of the centering component 23. Under normal conditions, the upper end of the side brackets 21 rotates outward, and the two side brackets 21 have an inverted octagonal structure. A pair of rollers 22 are provided on the side of the side bracket 21 near the pipe body, and the two rollers 22 are respectively located at both ends of the side bracket 21. The operation method for loading the flange onto the positioning mechanism 20 is as follows: The flange is placed between the two side brackets 21 above them. The flange first contacts the rollers 22 below the two side brackets 21. As the flange continues to move downward, it will push the side brackets 21 to rotate around the axis until the rollers 22 above the two side brackets 21 also contact the flange's arc surface. At this time, relying on the flange's own weight, the flange is clamped between the four rollers 22. Furthermore, by presetting the position of the centering component 23, the flange clamped by the four rollers 22 is coaxial with the pipe body. Next, the pipe body is placed on the first support roller 12, and one end of the pipe body is controlled to fit against the side of the flange. The welding gun 13 is then used to spot weld at the joint between the flange and the pipe body to establish a preliminary fixed connection between the flange and the pipe body. Then, the motor 15 is controlled to drive the pipe body to rotate, and the second support roller 22 will rotate passively. After observing that the flange rotates synchronously with the pipe body, the welding gun 13 is then used to continuously weld the circumferential joint between the flange and the pipe body. If, after spot welding, the flange does not rotate with the pipe body when the pipe body is rotated, it indicates that the spot welding was unsuccessful and the flange and pipe body have not established a preliminary fixed connection. In this case, motor 15 should be stopped and spot welded again, and then the above procedure should be followed. The flange is clamped by the side bracket 21 and the rotating support roller 22. The flange can be clamped and fixed without complicated control procedures. After the flange is welded to the pipe body, the pipe body can be lifted directly upwards and the flange can automatically detach from the upper side of the positioning mechanism 20 with an inverted octagonal structure. This greatly simplifies the efficiency of flange positioning and fixing.

[0021] Combination Figures 4-6 Furthermore, the side bracket 21 includes a central shaft 212 mounted on one side of the centering assembly 23, a rotating plate 211 rotatably mounted on one side of the central shaft 212, and a second support roller 22 rotatably disposed on the side of the rotating plate 211. A torsion spring 213 is provided between the rotating plate 211 and the central shaft 212. The torsion spring 213 elastically drives the upper end of the rotating plate 211 to rotate outward. A limit rod 214 is also fixedly mounted on the outer surface of the central shaft 212. The limit rod 214 is used to limit the angle of the upper end of the rotating plate 211 to rotate outward. Under normal conditions, the rotating plate 211 is driven to rotate by the torsion spring 213, causing the two rotating plates 211 to form an inverted octagonal structure under the limiting action of the corresponding limiting rod 214. During the process of placing the flange between the four support rollers 22, the tilt angle of the two side brackets 21 in the inverted octagonal structure gradually decreases until it can clamp the flange. When it is necessary to remove the flange from the inside of the four support rollers 22, simply lift the flange directly upwards. The side brackets 21, which are no longer under the weight of the flange, will return to their original tilt, and the upper side of the two side brackets 21 will return to the initial inverted octagonal structure. The flange can also be removed directly from the top. Combination Figure 6 A retaining ring 221 is fixedly fitted on the side of the roller 22 near the rotating plate 211. When the flange is placed inside the four rollers 22, the flange can be straightened to a vertical position by pushing the side of the flange to fit against the corresponding retaining ring 221. Combination Figures 4-7 A positioning block 241 is provided on the upper side of the support rod 24. The positioning block 241 is locked on the support rod 24 by a bolt 242 connected by a side thread. When the bolt 242 is loosened, the positioning block 241 can move up and down on the surface of the support rod 24, which makes it easy to lock the support rod 24 at a preset height. A bearing 243 is also fixedly assembled on one side of the bolt 242. Centering assembly 23 includes a bidirectional threaded post 231 mounted inside bearing 243. The thread structures at both ends of the bidirectional threaded post 231 are opposite. Both the upper and lower ends of the bidirectional threaded post 231 are threadedly connected to displacement platforms 232. A limiting sleeve 237 is fixedly provided on one side of the displacement platform 232. The limiting sleeve 237 is movably sleeved on the surface of the support rod 24. When the bidirectional threaded post 231 is rotated, the upper and lower displacement platforms 232 can be controlled to move closer or further apart. Both sides of the displacement platform 232 are rotatably connected to hinge rods 233. One end of the hinge rod 233 is connected to the center through a hinge sleeve seat 234. The shaft 212 is hinged, and the hinge rods 233 on the same side of the two displacement platforms 232 are hinged to a central shaft 212. When the bidirectional threaded column 231 is rotated to control the upper and lower displacement platforms 232 to move closer or further away from each other, the two central shafts 212 mounted on the side of the displacement platform 232 will also move closer or further away, thereby adjusting the distance between the two rotating plates 211. When dealing with flanges of different outer diameters, by adjusting the two central shafts 212 to a suitable distance, the side bracket 21 and the second support roller 22 can quickly clamp and position the flange. Furthermore, a knob 236 is fixedly connected to the upper end of the bidirectional threaded post 231, which facilitates the rotation of the bidirectional threaded post 231. Combination Figure 5 Two nuts 235 are also provided on the bidirectional threaded column 231. The two nuts 235 correspond to the two displacement stages 232. When the bidirectional threaded column 231 is rotated and the displacement stage 232 is adjusted to a suitable height, the nuts 235 can be used to lock the position of the displacement stage 232 on the bidirectional threaded column 231. Combination Figures 1-2 An extension frame 14 is fixedly installed on one side of the operating table 10. The extension frame 14 is located directly below the two rotating shafts 11. The support rod 24 is fixedly mounted on the upper side of the extension frame 14 through the mounting seat 244 at the lower end. This causes the positioning mechanism 20 to be mounted on one side of the operating table 10, so that the flange clamped by the positioning mechanism 20 at the preset position and the pipe on the operating table 10 can be accurately connected.

[0022] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flange welding auxiliary device, characterized in that, include: The operating table (10) has a pair of rotating shafts (11) rotatably mounted on its upper side. The rotating shafts (11) are equipped with a support roller (12) for lifting the pipe body. The operating table (10) is also equipped with a welding torch (13) for welding the pipe body and the flange. The positioning mechanism (20) is mounted on one side of the operating table (10). The positioning mechanism (20) positions the flange coaxially at one end of the pipe body. The positioning mechanism (20) includes a support rod (24). The upper end of the support rod (24) is supported by a centering component (23). Both sides of the centering component (23) are rotatably mounted with side brackets (21). Under normal conditions, the upper end of the side brackets (21) rotates outward. The two side brackets (21) have an inverted octagonal structure. The side brackets (21) are provided with a pair of rollers (22) on the side near the pipe body. The two rollers (22) are respectively set at both ends of the side brackets (21). The flange is placed between the two side brackets (21). The flange first contacts the second support roller (22) below the two side brackets (21) and pushes the side brackets (21) to rotate around the axis until the second support roller (22) above the two side brackets (21) also contacts the arc surface of the flange. At this time, the flange and the pipe body are coaxial.

2. The flange welding auxiliary device according to claim 1, characterized in that: The side bracket (21) includes a central shaft (212) mounted on one side of the centering assembly (23), a rotating plate (211) is rotatably mounted on one side of the central shaft (212), and the second support roller (22) is rotatably disposed on the side of the rotating plate (211).

3. The flange welding auxiliary device according to claim 2, characterized in that: A torsion spring (213) is provided between the rotating plate (211) and the central shaft (212). The torsion spring (213) elastically drives the upper end of the rotating plate (211) to rotate outward. A limit rod (214) is also fixedly mounted on the outer surface of the central shaft (212). The limit rod (214) is used to limit the angle of rotation of the upper end of the rotating plate (211) outward.

4. The flange welding auxiliary device according to claim 1, characterized in that: The second support roller (22) is fixedly fitted with a retaining ring (221) on the side near the rotating plate (211).

5. The flange welding auxiliary device according to claim 1, characterized in that: A positioning block (241) is provided on the upper side of the support rod (24). The positioning block (241) is locked on the support rod (24) by a bolt (242) with a side thread connection. A bearing (243) is also fixedly assembled on one side of the bolt (242).

6. The flange welding auxiliary device according to claim 5, characterized in that: The centering assembly (23) includes a bidirectional threaded column (231) assembled inside the bearing (243). The thread structures at both ends of the bidirectional threaded column (231) are opposite. The upper and lower ends of the bidirectional threaded column (231) are threadedly connected to displacement platforms (232). A limiting sleeve (237) is fixedly provided on one side of the displacement platform (232). The limiting sleeve (237) is movably sleeved on the surface of the support rod (24). Both sides of the displacement platform (232) are rotatably connected to hinge rods (233). One end of the hinge rod (233) is hinged to the central shaft (212) through a hinge sleeve seat (234). The hinge rods (233) on the same side of the two displacement stages (232) are hinged to a central shaft (212).

7. The flange welding auxiliary device according to claim 6, characterized in that: A knob (236) is fixedly connected to the upper end of the bidirectional threaded column (231).

8. The flange welding auxiliary device according to claim 6, characterized in that: The bidirectional threaded column (231) is also provided with two nuts (235), which correspond to two displacement stages (232).

9. The flange welding auxiliary device according to claim 1, characterized in that: An extension frame (14) is fixedly installed on one side of the operating table (10). The extension frame (14) is located directly below the two rotating shafts (11). The support rod (24) is fixedly mounted on the upper side of the extension frame (14) through the mounting seat (244) at the lower end.

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