Positioning-type furnace tube welding apparatus and method

Abstract

The application discloses a positioning type furnace pipe welding device and method, and relates to the technical field of furnace pipe welding.The device comprises a center positioning mechanism, and the center positioning mechanism is provided with a movable arc-shaped inner support plate and an unfolding plate on a center positioning shaft rod.The two pipes are respectively sleeved on the outer part of the two center positioning shaft rods of the same set of center positioning mechanisms, then the inner support electric cylinder drives the arc-shaped inner support plate to support the pipes from the inside through up-down cooperation, the center positioning is completed, then the unfolding electric cylinder drives the unfolding plate to unfold, the electric cylinder drives the two adjusting sliding seats to move until the pipe welding point contacts the pressure bearing plate and the second pressure bearing sensor changes, the gap adjustment is completed, the manual alignment is not needed in the process, and then the centering electric cylinder drives the centering sliding plate to move to the center of the end ring plate, the accurate center alignment of the two pipes is ensured, and the welding quality is improved.

Description

Technical Field

[0001] This invention relates to the field of furnace tube welding technology, and in particular to a positioning furnace tube welding device and method. Background Technology

[0002] With the rapid development of the intelligent manufacturing equipment industry, the manufacturing of metal cutting and welding equipment such as automatic and semi-automatic electric arc and plasma arc welding machines has been widely used in the manufacturing and on-site installation of furnace tubes in boilers, petrochemicals, nuclear industry and other fields. In recent years, in order to improve welding production efficiency and intelligence level, the industry has begun to develop intelligent welding systems based on digital control and has tried to apply them to furnace tube welding.

[0003] Existing furnace tube welding equipment relies heavily on external clamps or manual visual inspection for pipe alignment during pipe-to-pipe welding. This external positioning method makes it difficult to ensure the precise alignment of the axes of the two pipes. Especially when the pipes have ellipticity, uneven wall thickness, or fluctuations in outer diameter tolerance, external clamping can easily lead to defects such as misalignment and uneven welds. At the same time, the adjustment of the gap between the pipe ends often depends on operational experience. A gap that is too large or too small will directly affect the welding quality. In contrast, positioning from inside the pipe can directly use the inner wall of the pipe as a reference, which can more accurately ensure coaxiality and is not affected by outer diameter tolerance. Summary of the Invention

[0004] This invention discloses a positioning furnace tube welding device, which aims to solve the problems of existing furnace tube welding equipment that mostly use external clamps or manual visual inspection for alignment, making it difficult to ensure precise alignment of the pipe axis. When the pipe has ellipticity, uneven wall thickness, or fluctuations in outer diameter tolerance, it is easy to cause defects such as misalignment and uneven weld. Furthermore, the adjustment of the butt joint gap at the pipe end also relies heavily on experience, which directly affects the welding quality. In contrast, positioning from inside the pipe can directly use the inner wall as a reference, more accurately ensuring coaxiality, and is not affected by outer diameter tolerance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A positioning furnace tube welding device, comprising: Welding station; Two mounting slots are symmetrically opened on the top of the welding table, and guide rollers are connected to the inner walls on both sides of the two mounting slots at equal distances via bearings; Two centrally located sliding grooves are symmetrically located on the top of the welding table. The centrally located sliding grooves are parallel to the guide rollers, and two centrally located sliders are slidably connected inside each of the two centrally located sliding grooves. Two sets of central positioning mechanisms are set in the space above the mounting groove of the welding table. The central positioning mechanism includes two central positioning shafts, and the two central positioning shafts on the same set are staggered. A mounting bushing is fixedly connected to the top of the central slider, and a rotating shaft is connected to the mounting bushing via a bearing; An end ring plate is fixedly connected to one end of the rotating shaft facing the center positioning shaft. A centering groove is opened on one side of the end ring plate, and a centering slide plate is slidably connected in the centering groove. The center positioning shaft is fixedly connected to one side of the centering slide plate.

[0006] In a preferred embodiment, the central positioning mechanism further includes: Two adjusting slides are symmetrically opened on the central positioning shaft. Two adjusting slides are slidably connected in each of the two adjusting slides. The same integrated ring rod is fixedly connected to the same side of each pair of adjacent adjusting slides. A fixing ring is fixedly connected to the outer wall of the center positioning shaft near the centering slide plate. An adjusting electric cylinder is fixedly connected to the side of the fixing ring facing the adjacent adjusting slide, and the output end of the adjusting electric cylinder is fixedly connected to one side of the adjusting slide.

[0007] In a preferred embodiment, the central positioning mechanism further includes: Multiple mounting blocks are fixedly connected to the side of each adjusting slide away from the integrated ring rod, and an inner support electric cylinder is fixedly connected to the side of each mounting block away from the central positioning shaft. Multiple outer sleeves are fixedly connected to the output ends of adjacent inner support electric cylinders. Multiple telescopic connecting rods are fixedly connected to the inner wall of the outer sleeves. The ends of the multiple telescopic connecting rods are fixedly connected to the same inner pressure column. A pressure sensor is fixedly connected to the inner side wall of the outer sleeve at the center. The inner support plate is fixedly connected to the end of the inner pressure column; The intermediate connecting rod is fixedly connected to the opposite side of the two adjusting slides on the same horizontal plane.

[0008] In a preferred embodiment, the central positioning mechanism further includes: The mounting ring is fixedly connected to the outer wall of the center positioning shaft away from the centering slide plate. The top and bottom of the mounting ring are both provided with embedding grooves, and an unfolding electric cylinder is fixedly connected to each of the two embedding grooves. Two unfolding plates are fixedly connected to the output ends of corresponding unfolding electric cylinders. Each of the two unfolding plates has an operating groove on the side facing the central positioning shaft. A pressure sensor II is fixedly connected to each of the two operating grooves. Telescopic connecting rods II are distributed in a ring on the inner wall of the operating groove outside the pressure sensor II. The output ends of multiple telescopic connecting rods II located in the same operating groove are fixedly connected to the same pressure plate. The combined thickness of the two mounting rings is the same as the gap width between the two tubes. After the pressure plate contacts and is squeezed against the furnace tube, it is on the same surface as one side of the mounting ring.

[0009] In a preferred embodiment, a semi-sealed protection mechanism is provided outside the central positioning shaft, and the semi-sealed protection mechanism includes a sealing airbag. The sealing airbag is fixedly connected to the outer wall of the central positioning shaft away from the adjusting slide groove. The outer walls of the central positioning shaft at both ends of the sealing airbag are fixedly connected to external rings. Two hydraulic cylinders are fixedly connected to the side of the two external rings facing the sealing airbag. The output ends of the two hydraulic cylinders located on the same external ring are fixedly connected to the same compression ring.

[0010] In a preferred embodiment, the semi-sealed protection mechanism further includes: The mating end hole is located at the end of the central positioning shaft near the sealing airbag. The air guide hole is located on the outer wall of the center positioning shaft at the docking end hole; A trough is formed on the central positioning shaft, and a telescopic air supply pipe is fixedly connected inside the trough. The telescopic air supply pipe is connected to the docking end hole.

[0011] In a preferred embodiment, the semi-sealed protection mechanism further includes: A wire frame is fixedly connected to the top of the welding table near the telescopic gas supply pipe. A pipe sleeve is fixedly connected to the top of the wire frame, and the telescopic gas supply pipe passes through the pipe sleeve. Two connecting rods are fixedly connected to one side of the wire frame. The ends of the two connecting rods are fixedly connected to the same pump ring frame, and an air pump is fixedly connected inside the pump ring frame. One end of the telescopic air supply pipe is fixedly connected to the air supply end of the air pump.

[0012] In a preferred embodiment, the bottom of the welding station is fixedly connected to a base platform, and a mounting frame is fixedly connected to the bottom of the base platform near the bottom of the air pump. The top of the mounting frame has a fitting slot, in which an air tank is placed. An air inlet pipe is fixedly connected to the air pump, and one end of the air inlet pipe is connected to the exhaust end of the air tank. A fixing plate is fixedly connected to the side of the welding station near each centering slider. A centering electric cylinder is fixedly connected to the side of each fixing plate facing the adjacent centering slider. The output end of the centering electric cylinder is fixedly connected to the side of the adjacent mounting bushing. An external frame is fixedly connected to the side of the mounting bushing. A centering electric cylinder is fixedly connected to the side of the external frame facing the centering slide plate. The output end of the centering electric cylinder is fixedly connected to the side of the adjacent centering slide plate. A motor frame is fixedly connected to the side of the mounting bushing away from the center positioning shaft. A forward and reverse motor is fixedly connected to the motor frame. The output shaft of the forward and reverse motor is fixedly connected to the end of the rotating shaft through a coupling.

[0013] In a preferred embodiment, the same gantry frame is fixedly connected to both sides of the base platform, and a positioning groove is opened on the top of the gantry frame. A sliding seat is slidably connected in the positioning groove. An end plate is fixedly connected to the top of the gantry frame. A positioning electric cylinder is fixedly connected to the side of the end plate facing the sliding seat. The output end of the positioning electric cylinder is fixedly connected to one side of the sliding seat. A mounting plate is fixedly connected to the bottom of the sliding seat. A through hole is opened on the top of the mounting plate. A lifting sleeve is slidably connected in the through hole. Two lifting electric cylinders are fixedly connected to the top of the mounting plate outside the lifting sleeve. The output ends of the two lifting electric cylinders are fixedly connected to the outer wall of the lifting sleeve. A welding head is fixedly connected inside the lifting sleeve. A connecting ring is fixedly connected to the outer wall of the lifting sleeve below the mounting plate. Two symmetrically distributed reinforcing telescopic rods are fixedly connected to the top of the connecting ring. The top ends of the two reinforcing telescopic rods are fixedly connected to the bottom of the mounting plate.

[0014] A method for welding a positioning furnace tube, using a positioning furnace tube welding device as described above, includes the following steps: Step 1: When performing pipe-to-pipe welding, place the two pipes outside the two center positioning shafts of the same set of center positioning mechanisms. After the center positioning shafts are inside the furnace tube, the inner support electric cylinder drives the inner support plate to support the inside of the pipe. After center positioning is completed, the adjustment and unfolding electric cylinder drives the unfolding plate to unfold. The adjustment electric cylinder drives the two adjusting slides to move. When the welding point of the pipe contacts the pressure plate and the reading of the pressure sensor changes, the gap between the pipes is adjusted. After the gap between the pipes is adjusted, the unfolding electric cylinder drives the unfolding plate to reset. Step 2: After the two pipes are centered, the centering electric cylinder drives the centering slide plate to the center position of the end ring plate, so that the two pipes are centered and aligned. After the two pipes are connected, the centering electric cylinder drives the pipe to move to the bottom of the gantry. Step 3: Next, adjust the positioning electric cylinder to move the welding head to the middle position of the two pipe joints. Then, adjust the lifting electric cylinder to lower the lifting sleeve, moving the welding head to the designated position and starting the welding operation. During the welding process, start the forward and reverse motors to rotate the pipes. At the same time, start the air pump, which introduces the protective gas from the air tank into the central positioning shaft and discharges it into the interior of the two pipes near the welding point through the air guide hole. The protective gas protects the welding point. After the two pipes are welded, the centering electric cylinder moves the pipes back to their original position. After the pipes are back to their original position, the inner support plate on one of the central positioning shafts separates from the inner wall of the pipe. The adjusting electric cylinder on the other central positioning shaft moves the welded pipe onto that central positioning shaft. Then, the two central positioning shafts are staggered to complete the unloading of the welded pipe.

[0015] Based on the above solution, the beneficial effects of the present invention are as follows: 1. The positioning furnace tube welding equipment provided by this invention, in the tube-to-tube welding operation, puts two pipes into the two center positioning shafts of the same set of center positioning mechanisms respectively. Then, the inner support electric cylinder drives the arc-shaped inner support plate (upper and lower cooperation) to support the pipe from the inside and complete the center positioning. Next, the adjustment and unfolding electric cylinder drives the unfolding plate to unfold. The adjustment electric cylinder drives the two adjusting slides to move until the pipe welding point contacts the pressure plate and the reading of the pressure sensor changes, thus completing the gap adjustment. This process does not require manual alignment. Afterwards, the centering electric cylinder drives the centering slide plate to move to the center of the end ring plate to ensure that the two pipes are accurately aligned, thereby improving the technical effect of welding quality.

[0016] 2. The two central positioning mechanisms of the present invention are staggered, allowing the furnace tube to extend from one end of the central positioning mechanism, enabling the two furnace tubes to be installed in a staggered manner. The central positioning mechanism is used to position and fix the interior of the furnace tube, using the finely machined interior of the furnace tube as the positioning basis. The two symmetrically arranged inner support plates in the central positioning mechanism move, so that the two inner support plates move by the same distance. The central axis of the two central positioning mechanisms is determined, thereby determining the central axis of the furnace tube and making the positioning more accurate.

[0017] 3. After the furnace tubes of the present invention are positioned and fixed, the electric cylinder drives the two adjusting slides to move so that the two furnace tubes are close to each other, and then the ends of the furnace tubes come into contact with the pressure plate on the unfolding plate. After the position of the furnace tube ends is accurately determined by the sensor, the unfolding plate is retracted, and then the two staggered furnace tubes are moved so that the central axes of the two furnace tubes are aligned. During this process, the unfolding plate will not be clamped by the two furnace tubes, and the unfolding plate will not affect the interval between the two furnace tubes, thus ensuring the accurate determination of the interval between the two furnace tubes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a positioning furnace tube welding device proposed in this invention.

[0019] Figure 2 for Figure 1 A top view of the overall structure.

[0020] Figure 3 This is a schematic diagram of the combined structure of a gas storage tank, a central positioning mechanism, a semi-sealed protection mechanism, and a forward and reverse motor for a positioning furnace tube welding equipment proposed in this invention.

[0021] Figure 4 for Figure 3 The overall structure is flipped.

[0022] Figure 5 This is a schematic diagram of the combined structure of the center positioning mechanism and the semi-sealed protection mechanism of a positioning furnace tube welding equipment proposed in this invention.

[0023] Figure 6 This is an enlarged view of the combined structure of the inner support plate, adjusting slide, integrated ring rod, and intermediate connecting rod of a positioning furnace tube welding device proposed in this invention.

[0024] Figure 7 for Figure 6 Exploded view of the structure of the middle adjusting slide, inner support plate, outer sleeve and inner pressure column.

[0025] Figure 8 This is an exploded view of the pressure plate, unfolding plate, and mounting ring structure of a positioning furnace tube welding device proposed in this invention.

[0026] Figure 9 This is a schematic diagram of a semi-sealed protection mechanism and a central positioning shaft combination mechanism for a positioning furnace tube welding equipment proposed in this invention.

[0027] Figure 10 This is a schematic diagram of a semi-sealed protection mechanism for a positioning furnace tube welding equipment proposed in this invention.

[0028] Figure 11 This is a schematic diagram of the combined structure of the sliding seat, mounting plate, lifting sleeve and welding torch head of a positioning furnace tube welding equipment proposed in this invention.

[0029] In the diagram: 1. Welding table; 2. Centering slide; 3. Gantry frame; 4. Forward and reverse motor; 5. Sliding seat; 6. Positioning slide; 7. Positioning electric cylinder; 8. End plate; 9. Centering slider; 10. Centering electric cylinder; 11. Base platform; 12. Guide roller; 13. Mounting slot; 14. Mounting frame; 15. Air tank; 16. Fixing plate; 17. Centering positioning mechanism; 1701. Centering positioning shaft; 1702. Internal support. Plate; 1703, Fixing ring; 1704, Adjusting electric cylinder; 1705, Adjusting slide; 1706, Mounting ring; 1707, Mounting block; 1708, Intermediate connecting rod; 1709, Adjusting slide; 1710, Inner pressure column; 1711, Integrated ring rod; 1712, Inner support electric cylinder; 1713, Outer sleeve; 1714, Telescopic connecting rod one; 1715, Pressure sensor one; 1716, Telescopic connecting rod two; 1 717. Operating slot; 1718. Pressure sensor II; 1719. Deployment electric cylinder; 1720. Deployment plate; 1721. Pressure plate; 18. Semi-sealed protection mechanism; 1801. Sealing airbag; 1802. Docking end hole; 1803. Pump ring frame; 1804. Air pump; 1805. Air guide pipe; 1806. Pipe sleeve; 1807. Wire frame; 1808. Telescopic air supply pipe; 1809. Air guide hole; 1 810. Extrusion ring; 1811. External connecting ring; 1812. Hydraulic cylinder; 1813. Connecting rod; 19. Rotating shaft; 20. Motor frame; 21. Mounting bushing; 22. End ring plate; 23. Centering groove; 24. Centering slide plate; 25. Centering electric cylinder; 26. External frame; 27. Mounting plate; 28. Lifting sleeve; 29. ​​Connecting ring; 30. Welded head; 31. Reinforced telescopic rod; 32. Lifting electric cylinder. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] The positioning furnace tube welding equipment disclosed in this invention is mainly used for welding furnace tubes. Existing furnace tube welding equipment mostly uses external clamps or manual visual inspection for centering, which makes it difficult to ensure precise alignment of the pipe axis. When the pipe has ellipticity, uneven wall thickness, or fluctuations in outer diameter tolerance, it is easy to cause defects such as misalignment and uneven weld. Furthermore, the adjustment of the butt joint gap at the pipe end also relies heavily on experience, which directly affects the welding quality. In contrast, positioning from inside the pipe can directly use the inner wall as a reference, more accurately ensuring coaxiality, and is not affected by the outer diameter tolerance.

[0032] This invention employs a scheme that supports the furnace tubes from the inside, combined with a staggered arrangement of the furnace tubes for centering and fixing. First, the position of the furnace tube end is determined to complete the determination of the gap between the two furnace tubes. Then, the central axes of the two furnace tubes are aligned before welding is performed.

[0033] In this invention, the furnace tube can also be referred to as a tube or pipe.

[0034] Reference Figures 1-11 A positioning furnace tube welding device, comprising: Welding station 1; Two mounting slots 13 are symmetrically opened on the top of the welding table 1. The inner walls on both sides of the two mounting slots 13 are connected to guide rollers 12 at equal distances via bearings. The guide rollers 12 are used to transport the furnace tube to the center positioning mechanism 17. During transport, the furnace tube is first hoisted or transported onto the guide rollers 12 and rolled along the axial direction of the guide rollers 12 so that the furnace tube is aligned with the center positioning mechanism 17.

[0035] Two centrally located grooves 2 are symmetrically located on the top of the welding table 1. The centrally located grooves 2 are parallel to the guide roller 12. Two centrally located sliders 9 are slidably connected inside each of the two centrally located grooves 2. The centrally located sliders 9 slide and move in the centrally located grooves 2, so that the central positioning mechanism 17 moves along the centrally located grooves 2, thereby causing the two central positioning mechanisms 17 to move closer to or further away from each other.

[0036] Two sets of center positioning mechanisms 17 are set in the space above the mounting groove 13 on the welding table 1. The center positioning mechanism 17 includes two center positioning shafts 1701, and the two center positioning shafts 1701 on the same set are staggered. When the furnace tube needs to be butt welded, the two center positioning shafts 1701 move closer to each other. The center positioning shaft 1701 can be regarded as the central axis of the center positioning mechanism, and it is also the central axis of the furnace tube after it is installed on the center positioning shaft 1701 and the positioning and fixing are completed. That is, the central axis of the furnace tube coincides with the central axis of the center positioning shaft 1701.

[0037] Mounting bushing 21 is fixedly connected to the top of the central slider 9. A rotating shaft 19 is connected to the mounting bushing 21 via a bearing. A motor frame 20 is fixedly connected to the side of the mounting bushing 21 away from the central positioning shaft 1701. A forward and reverse motor 4 is fixedly connected to the motor frame 20. The output shaft of the forward and reverse motor 4 is fixedly connected to the end of the rotating shaft 19 via a coupling.

[0038] The end ring plate 22 is fixedly connected to one end of the rotating shaft 19 facing the center positioning shaft 1701. A centering groove 23 is opened on one side of the end ring plate 22. A centering slide plate is slidably connected in the centering groove 23. The center positioning shaft 1701 is fixedly connected to one side of the centering slide plate 24. The centering slide plate 24 moves on the centering groove 23, causing the center positioning shaft 1701 to move.

[0039] Reference Figures 1-8 The central positioning mechanism 17 also includes: Two adjusting slides 1705 are symmetrically opened on the central positioning shaft 1701. Two adjusting slides 1705 are slidably connected to each of the two adjusting slides 1705. The same integrated ring rod 1711 is fixedly connected to the same side of each pair of adjacent adjusting slides 1709. The fixing ring 1703 is fixedly connected to the outer wall of the center positioning shaft 1701 near the centering slide plate 24. The side of the fixing ring 1703 facing the adjacent adjusting slide 1709 is fixedly connected to the adjusting electric cylinder 1704, and the output end of the adjusting electric cylinder 1704 is fixedly connected to one side of the adjusting slide 1709. The adjusting electric cylinder 1704 drives the entire furnace tube to move.

[0040] In specific application scenarios, when performing pipe-to-pipe welding operations, the two pipes are placed outside the two center positioning shafts 1701 of the same set of center positioning mechanisms 17. At this time, the two center positioning shafts 1701 are staggered and located inside the furnace tube. The inner support electric cylinder 1712 drives the inner support plate 1702 to support the inside of the pipe. The inner support plate 1702 has an arc-shaped fitting structure. The upper and lower inner support plates 1702 cooperate to achieve the center positioning of the pipe. After the center positioning is completed, the unfolding electric cylinder 1719 is adjusted to drive the unfolding plate 1720 to unfold. When the electric cylinder 1704 is turned on, it drives the two adjusting slides 1709 to move. When the welding point of the pipe contacts the pressure plate 1721, the reading of the pressure sensor 1718 changes. Based on this reading, it is determined whether the furnace tube is in place. The gap between the pipes is then adjusted. During the entire operation, no manual alignment is required. After the two pipes are centered, the unfolding plate 1720 is retracted. The centering electric cylinder 25 drives the centering slide plate 24 to move to the center position of the end ring plate 22. The two pipes are then centered and aligned, improving the center alignment accuracy and thus improving the pipe-to-pipe welding effect.

[0041] Specifically, by setting up two sets of central positioning mechanisms 17, pipe clamping and welding operations can be carried out alternately. When one set is at the welding station, the other set can be prepared at the loading and unloading station, thus improving efficiency.

[0042] It should be noted that when the pipe is centered by the inner support plate 1702, after the inner support plate 1702 contacts the inner wall of the pipe, the inner support electric cylinder 1712 continuously outputs, and the inner pressure column 1710 squeezes the pressure sensor 1715. When the pressure sensor 1715 reaches the specified reading, the centering is completed, ensuring stable clamping without damaging the pipe.

[0043] Reference Figure 6 and Figure 7 In a preferred embodiment, the central positioning mechanism 17 further includes: Multiple mounting blocks 1707 are fixedly connected to the side of each adjusting slide 1709 away from the integrated ring rod 1711, and an inner support electric cylinder 1712 is fixedly connected to the side of each mounting block 1707 away from the central positioning shaft rod 1701. Multiple outer sleeves 1713 are fixedly connected to the output end of adjacent inner support electric cylinders 1712. Multiple telescopic connecting rods 1714 are fixedly connected to the inner wall of the outer sleeve 1713. The ends of the multiple telescopic connecting rods 1714 are fixedly connected to the same inner pressure column 1710. A pressure sensor 1715 is fixedly connected to the inner side wall of the outer sleeve 1713 at the center. The inner support plate 1702 is fixedly connected to the end of the inner pressure column 1710; The intermediate connecting rod 1708 is fixedly connected to the opposite side of the two adjusting slides 1709 on the same horizontal plane. The intermediate connecting rod 1708 enables the two adjacent inner support plates 1702 to move together with the adjusting slides 1709, ensuring the stability of the furnace tube movement.

[0044] Reference Figure 5 and Figure 8 In a preferred embodiment, the central positioning mechanism 17 further includes: Mounting ring 1706 is fixedly connected to the outer wall of the center positioning shaft 1701 away from the centering slide plate 24. The top and bottom of mounting ring 1706 are both provided with embedding grooves, and each of the two embedding grooves is fixedly connected to an unfolding electric cylinder 1719. Two unfolding plates 1720 are fixedly connected to the output ends of corresponding unfolding electric cylinders 1719. Each of the two unfolding plates 1720 has an operating groove 1717 on the side facing the central positioning shaft 1701. Each of the two operating grooves 1717 has a pressure sensor 1718 fixedly connected to it. Telescopic connecting rods 1716 are distributed in a ring on the inner wall of the operating groove 1717 outside the pressure sensor 1718. The output ends of multiple telescopic connecting rods 1716 located in the same operating groove 1717 are fixedly connected to the same pressure plate 1721. The combined thickness of the two mounting rings 1706 is the same as the gap width between the two tubes. After the pressure plate 1721 contacts and is squeezed against the furnace tube, it is on the same surface as one side of the mounting ring 1706. This invention utilizes a retractable unfolding plate 1720. The furnace tube moves and comes into contact with the unfolding plate 1720, and the unfolding plate 1720 contacts the end face of the furnace tube, causing the unfolding plate 1720 to retract into the operating groove 1717. During this process, the pressure signal of the pressure sensor 1718 serves as a signal for aligning the unfolding plate 1720 with the mounting ring 1706, thereby positioning the end face of the furnace tube. When the furnace tube needs to be welded, the unfolding plate 1720 is retracted into the furnace tube via the unfolding electric cylinder 1719, exposing the end face of the furnace tube.

[0045] Reference Figure 1 , Figure 3 , Figure 5 and Figure 9 In a preferred embodiment, a semi-sealed protection mechanism 18 is provided outside the central positioning shaft 1701, and the semi-sealed protection mechanism 18 includes a sealing airbag 1801. The sealing airbag 1801 is fixedly connected to the outer wall of the central positioning shaft 1701 away from the adjusting slide groove 1705. The outer walls of the central positioning shaft 1701 at both ends of the sealing airbag 1801 are fixedly connected to outer rings 1811. Two hydraulic cylinders 1812 are fixedly connected to the side of the two outer rings 1811 facing the sealing airbag 1801. The output ends of the two hydraulic cylinders 1812 located on the same outer ring 1811 are fixedly connected to the same compression ring 1810.

[0046] Specifically, after the two pipes are joined, the hydraulic cylinder 1812 is adjusted to drive the extrusion ring 1810 to extrude the sealing airbag 1801, causing the sealing airbag 1801 to expand outwards and fit tightly against the inner wall of the pipe. This achieves a semi-sealed state, improving the stability of the pipe welding process. After the semi-sealing, during the circumferential welding operation of the two pipes, the air pump 1804 is started. The air pump 1804 introduces the protective gas inside the air tank 15 into the central positioning shaft 1701, and discharges it into the interior of the two pipes near the welding point through the air guide hole 1809. The welding point is protected by the protective gas. At the same time, under the shielding of the sealing airbag 1801, the protective gas only flows to the welding point, improving the utilization rate of the protective gas and reducing its loss.

[0047] Reference Figure 9 and Figure 10 In a preferred embodiment, the semi-sealed protection mechanism 18 further includes: The mating end hole 1802 is opened at one end of the center positioning shaft 1701 near the sealing airbag 1801; The air guide hole 1809 is opened on the outer wall of the center positioning shaft 1701 at the docking end hole 1802; The cable trough is located on the central positioning shaft 1701. A telescopic air supply pipe 1808 is fixedly connected inside the cable trough, and the telescopic air supply pipe 1808 is connected to the docking end hole 1802.

[0048] Reference Figure 9 and Figure 10 In a preferred embodiment, the semi-sealed protection mechanism 18 further includes: The wire frame 1807 is fixedly connected to the top of the welding table 1 near the telescopic gas supply pipe 1808. The top of the wire frame 1807 is fixedly connected to the sleeve 1806, and the telescopic gas supply pipe 1808 passes through the sleeve 1806. Two connecting rods 1813 are fixedly connected to one side of the wire frame 1807. The ends of the two connecting rods 1813 are fixedly connected to the same pump ring frame 1803, and an air pump 1804 is fixedly connected inside the pump ring frame 1803. One end of the telescopic air supply pipe 1808 is fixedly connected to the air supply end of the air pump 1804.

[0049] Reference Figures 1-4 In a preferred embodiment, a base platform 11 is fixedly connected to the bottom of the welding table 1, and a mounting bracket 14 is fixedly connected to the base platform 11 near the bottom of the air pump 1804. The top of the mounting bracket 14 has a fitting slot, in which an air tank 15 is placed. An air inlet pipe 1805 is fixedly connected to the air inlet of the air pump 1804, and one end of the air inlet pipe 1805 is connected to the exhaust end of the air tank 15. A fixing plate 16 is fixedly connected to the side of the welding table 1 near each centering slider 9, and a centering plate 16 is fixedly connected to the side of each fixing plate 16 facing the adjacent centering slider 9. The output end of the electric cylinder 10 is fixedly connected to one side of the adjacent mounting sleeve 21. An external frame 26 is fixedly connected to one side of the mounting sleeve 21. A centering electric cylinder 25 is fixedly connected to the side of the external frame 26 facing the centering slide plate 24. The output end of the centering electric cylinder 25 is fixedly connected to one side of the adjacent centering slide plate 24. A motor frame 20 is fixedly connected to the side of the mounting sleeve 21 away from the center positioning shaft 1701. A forward and reverse motor 4 is fixedly connected to the motor frame 20. The output shaft of the forward and reverse motor 4 is fixedly connected to the end of the rotating shaft 19 through a coupling.

[0050] Reference Figure 1 , Figure 2 and Figure 11 In a preferred embodiment, the same gantry frame 3 is fixedly connected to both sides of the base platform 11, and the top of the gantry frame 3 has a positioning groove 6. A sliding seat 5 is slidably connected in the positioning groove 6. An end plate 8 is fixedly connected to the top of the gantry frame 3. A positioning electric cylinder 7 is fixedly connected to the side of the end plate 8 facing the sliding seat 5. The output end of the positioning electric cylinder 7 is fixedly connected to one side of the sliding seat 5. An mounting plate 27 is fixedly connected to the bottom of the sliding seat 5. A through hole is opened at the top of the mounting plate 27. A lifting sleeve 28 is slidably connected in the through hole. Two lifting electric cylinders 32 are fixedly connected to the top of the mounting plate 27 outside the lifting sleeve 28. The output ends of the two lifting electric cylinders 32 are fixedly connected to the outer side wall of the lifting sleeve 28. A welding head 30 is fixedly connected inside the lifting sleeve 28. A connecting ring 29 is fixedly connected to the outer side wall of the lifting sleeve 28 below the mounting plate 27. Two symmetrically distributed reinforcing telescopic rods 31 are fixedly connected to the top of the connecting ring 29. The top ends of the two reinforcing telescopic rods 31 are fixedly connected to the bottom of the mounting plate 27.

[0051] A method for welding a positioning furnace tube, using a positioning furnace tube welding device as described above, includes the following steps: Step 1: When performing pipe-to-pipe welding, place the two pipes outside the two center positioning shafts 1701 of the same set of center positioning mechanisms 17. After the center positioning shafts 1701 are located inside the furnace tube, the inner support electric cylinder 1712 drives the inner support plate 1702 to support the inside of the pipe. After center positioning is completed, the adjustment and unfolding electric cylinder 1719 drives the unfolding plate 1720 to unfold. The adjustment electric cylinder 1704 drives the two adjustment slides 1709 to move. When the welding point of the pipe contacts the pressure plate 1721 and the reading of the pressure sensor 1718 changes, the gap between the pipes is adjusted. After the gap between the pipes is adjusted, the unfolding electric cylinder 1719 drives the unfolding plate 1720 to reset. Step 2: After the two pipes are centered, the centering electric cylinder 25 drives the centering slide plate 24 to move to the center position of the end ring plate 22, so that the two pipes are centered and aligned. After the two pipes are connected, the centering electric cylinder 10 drives the pipe to move to the bottom of the gantry 3. Step 3: Next, adjust the positioning electric cylinder 7 to move the welding head 30 to the middle position of the two pipe joints. Then, adjust the lifting electric cylinder 32 to lower the lifting sleeve 28, moving the welding head 30 to the designated position and starting the welding operation. During the welding process, start the forward and reverse motor 4, which rotates the pipe. At the same time, start the air pump 1804, which introduces the protective gas inside the air tank 15 into the center positioning shaft 1701 and discharges it into the interior of the two pipes near the welding point through the air guide hole 1809. The protective gas protects the welding point. After the two pipes are welded, the centering electric cylinder 25 drives the pipe to reset. After the pipe is reset, the inner support plate 1702 on one of the center positioning shafts 1701 separates from the inner wall of the pipe. The adjusting electric cylinder 1704 on the other center positioning shaft 1701 moves the welded pipe onto the center positioning shaft 1701. Then, the two center positioning shafts 1701 are staggered to complete the unloading of the welded pipe.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A positioning furnace tube welding device, characterized in that, include: Welding station (1); Two mounting slots (13) are symmetrically opened on the top of the welding table (1), and guide rollers (12) are connected to the inner walls of the two mounting slots (13) at equal distances via bearings. Two central sliding grooves (2) are symmetrically opened on the top of the welding table (1). The central sliding grooves (2) are parallel to the guide roller (12), and two central sliding blocks (9) are slidably connected inside the two central sliding grooves (2). Two sets of central positioning mechanisms (17) are set in the space above the mounting groove (13) of the welding table (1). The central positioning mechanism (17) includes two central positioning shafts (1701), and the two central positioning shafts (1701) on the same set are staggered. Mounting bushing (21) is fixedly connected to the top of the central slider (9), and a rotating shaft (19) is connected to the mounting bushing (21) via a bearing. An end ring plate (22) is fixedly connected to one end of the rotating shaft (19) facing the center positioning shaft (1701). A centering groove (23) is opened on one side of the end ring plate (22). A centering slide plate (24) is slidably connected in the centering groove (23). The center positioning shaft (1701) is fixedly connected to one side of the centering slide plate (24).

2. The positioning furnace tube welding equipment according to claim 1, characterized in that, The central positioning mechanism (17) also includes: Two adjusting slides (1705) are symmetrically opened on the central positioning shaft (1701). Two adjusting slides (1709) are slidably connected in each of the two adjusting slides (1705). The same integrated ring rod (1711) is fixedly connected to the same side of each pair of adjacent adjusting slides (1709). A fixing ring (1703) is fixedly connected to the outer wall of the center positioning shaft (1701) near the centering slide plate (24). An adjusting electric cylinder (1704) is fixedly connected to the side of the fixing ring (1703) facing the adjacent adjusting slide (1709), and the output end of the adjusting electric cylinder (1704) is fixedly connected to one side of the adjusting slide (1709).

3. The positioning furnace tube welding equipment according to claim 2, characterized in that, The central positioning mechanism (17) also includes: Multiple mounting blocks (1707) are fixedly connected to the side of each adjusting slide (1709) away from the integrated ring rod (1711), and an inner support electric cylinder (1712) is fixedly connected to the side of each mounting block (1707) away from the central positioning shaft rod (1701). Multiple outer sleeves (1713) are fixedly connected to the output end of adjacent inner support electric cylinders (1712). Multiple telescopic connecting rods (1714) are fixedly connected to the inner wall of the outer sleeves (1713). The ends of the multiple telescopic connecting rods (1714) are fixedly connected to the same inner pressure column (1710). A pressure sensor (1715) is fixedly connected to the inner side wall of the outer sleeve (1713) at the center. The inner support plate (1702) is fixedly connected to the end of the inner pressure column (1710); The intermediate connecting rod (1708) is fixedly connected to the opposite side of two adjusting slides (1709) on the same horizontal plane.

4. The positioning furnace tube welding equipment according to claim 3, characterized in that, The central positioning mechanism (17) also includes: The mounting ring (1706) is fixedly connected to the outer wall of the center positioning shaft (1701) away from the centering slide plate (24). The top and bottom of the mounting ring (1706) are both provided with embedding grooves, and each of the two embedding grooves is fixedly connected with an unfolding electric cylinder (1719). Two unfolding plates (1720) are fixedly connected to the output ends of corresponding unfolding electric cylinders (1719). Each of the two unfolding plates (1720) has an operating groove (1717) on the side facing the central positioning shaft (1701). Each of the two operating grooves (1717) is fixedly connected to a pressure sensor (1718). The inner wall of the operating groove (1717) outside the pressure sensor (1718) is circumferentially distributed with telescopic connecting rods (1716). The output ends of multiple telescopic connecting rods (1716) located in the same operating groove (1717) are fixedly connected to the same pressure plate (1721). The thickness of the two mounting rings (1706) is the same as the gap width between the two tubes. After the pressure plate (1721) contacts and is squeezed with the furnace tube, it is on the same surface as one side of the mounting ring (1706).

5. The positioning furnace tube welding equipment according to claim 4, characterized in that, The central positioning shaft (1701) is provided with a semi-sealed protection mechanism (18), and the semi-sealed protection mechanism (18) includes a sealing airbag (1801). The sealing airbag (1801) is fixedly connected to the outer wall of the central positioning shaft (1701) away from the adjusting slide (1705). The outer walls of the central positioning shaft (1701) at both ends of the sealing airbag (1801) are fixedly connected with outer rings (1811). Two hydraulic cylinders (1812) are fixedly connected to the side of the two outer rings (1811) facing the sealing airbag (1801). The output ends of the two hydraulic cylinders (1812) located on the same outer ring (1811) are fixedly connected to the same extrusion ring (1810).

6. The positioning furnace tube welding equipment according to claim 5, characterized in that, The semi-sealed protection mechanism (18) also includes: The mating end hole (1802) is opened at the end of the center positioning shaft (1701) near the sealing airbag (1801); The air guide hole (1809) is opened on the outer wall of the center positioning shaft (1701) at the docking end hole (1802); A cable trough is provided on the central positioning shaft (1701). A telescopic air supply pipe (1808) is fixedly connected inside the cable trough. The telescopic air supply pipe (1808) is connected to the docking end hole (1802).

7. The positioning furnace tube welding equipment according to claim 6, characterized in that, The semi-sealed protection mechanism (18) also includes: A wire frame (1807) is fixedly connected to the top of the welding table (1) near the telescopic gas supply pipe (1808). A pipe sleeve (1806) is fixedly connected to the top of the wire frame (1807), and the telescopic gas supply pipe (1808) passes through the pipe sleeve (1806). Two connecting rods (1813) are fixedly connected to one side of the wire frame (1807). The ends of the two connecting rods (1813) are fixedly connected to the same pump ring frame (1803), and an air pump (1804) is fixedly connected inside the pump ring frame (1803). One end of the telescopic air supply pipe (1808) is fixedly connected to the air supply end of the air pump (1804).

8. The positioning furnace tube welding equipment according to claim 7, characterized in that, The bottom of the welding table (1) is fixedly connected to a base platform (11), and a mounting bracket (14) is fixedly connected to the bottom of the base platform (11) near the bottom of the air pump (1804). The top of the mounting bracket (14) has a fitting slot, in which an air tank (15) is placed. An air guide pipe (1805) is fixedly connected to the air inlet end of the air pump (1804). One end of the air guide pipe (1805) is connected to the exhaust end of the air tank (15). A fixing plate (16) is fixedly connected to the side of the welding table (1) near each centering slider (9). A centering electric cylinder (10) is fixedly connected to the side of each fixing plate (16) facing the adjacent centering slider (9). The output end of the centering electric cylinder (10) is fixedly connected to one side of the adjacent mounting bushing (21). An external frame (26) is fixedly connected to one side of the mounting bushing (21). A centering electric cylinder (25) is fixedly connected to the side of the external frame (26) facing the centering slide plate (24). The output end of the centering electric cylinder (25) is fixedly connected to one side of the adjacent centering slide plate (24). A motor frame (20) is fixedly connected to the side of the mounting bushing (21) away from the center positioning shaft (1701). A forward and reverse motor (4) is fixedly connected to the motor frame (20). The output shaft of the forward and reverse motor (4) is fixedly connected to the end of the rotating shaft (19) through a coupling.

9. A positioning furnace tube welding device according to claim 8, characterized in that, The base (11) is fixedly connected to the same gantry frame (3) on both sides, and the top of the gantry frame (3) has a positioning groove (6), in which a sliding seat (5) is slidably connected. The top of the gantry frame (3) is fixedly connected to an end plate (8), and the side of the end plate (8) facing the sliding seat (5) is fixedly connected to a positioning electric cylinder (7). The output end of the positioning electric cylinder (7) is fixedly connected to one side of the sliding seat (5). The bottom of the sliding seat (5) is fixedly connected to a mounting plate (27), and the top of the mounting plate (27) has a through hole, in which a lifting sleeve (28) is slidably connected. The mounting plate (27) is located on the top of the lifting sleeve (28) and is fixedly connected to two lifting electric cylinders (32). The output ends of the two lifting electric cylinders (32) are fixedly connected to the outer side wall of the lifting sleeve (28). The lifting sleeve (28) is fixedly connected to a welding head (30). The outer side wall of the lifting sleeve (28) located below the mounting plate (27) is fixedly connected to a connecting ring (29). The top of the connecting ring (29) is fixedly connected to two symmetrically distributed reinforcing telescopic rods (31). The top ends of the two reinforcing telescopic rods (31) are fixedly connected to the bottom of the mounting plate (27).

10. A method for welding a positioning furnace tube, using the positioning furnace tube welding equipment as described in claim 9, characterized in that, Includes the following steps: Step 1: When performing pipe-to-pipe welding, place the two pipes outside the two center positioning shafts (1701) of the same set of center positioning mechanisms (17). After the center positioning shafts (1701) are inside the pipe, the inner support electric cylinder (1712) drives the inner support plate (1702) to support the inside of the pipe. After the center positioning is completed, the adjustment and unfolding electric cylinder (1719) drives the unfolding plate (1720) to unfold. The adjustment electric cylinder (1704) drives the two adjustment slides (1709) to move. When the welding point of the pipe contacts the pressure plate (1721) and the reading of the pressure sensor (1718) changes, the gap between the pipes is adjusted. After the gap between the pipes is adjusted, the unfolding electric cylinder (1719) drives the unfolding plate (1720) to reset. Step 2: After the two pipes are centered, the centering electric cylinder (25) drives the centering slide plate (24) to move to the center position of the end ring plate (22), so that the two pipes are centered and aligned. After the two pipes are connected, the centering electric cylinder (10) drives the pipes to move to the bottom of the gantry (3). Step 3: Next, adjust the positioning electric cylinder (7) to move the welding head (30) to the middle position of the two pipe connection points, and then adjust the lifting electric cylinder (32) to move the lifting sleeve (28) down to move the welding head (30) to the designated position and start the welding operation. During the welding process, start the forward and reverse motor (4), which drives the pipe to rotate. At the same time, start the air pump (1804), which introduces the protective gas inside the air tank (15) into the center positioning shaft (1701) and through the air guide hole (1804). 09) The gas is discharged into the interior of the two pipes near the welding point. The welding point is protected by the protective gas. After the two pipes are welded, the centering electric cylinder (25) drives the pipe to reset. After the pipe is reset, the inner support plate (1702) on one of the central positioning shafts (1701) separates from the inner wall of the pipe. The adjusting electric cylinder (1704) on the other central positioning shaft (1701) drives the welded pipe to move to the central positioning shaft (1701). Then the two central positioning shafts (1701) are staggered to complete the unloading of the welded pipe.

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