A steel pipe high frequency induction welding device

Abstract

The application belongs to the technical field of welding device, and discloses a steel pipe high-frequency induction welding device, which comprises a base, a rolling unit, a clamping unit and a welding unit arranged in sequence on the base, wherein the clamping unit comprises a clamping seat, a clamping mechanism and a partition plate, the clamping seat is fixed on the base, the clamping mechanism comprises two clamping rollers, the two clamping rollers are rotatably arranged on the clamping seat, and the partition plate is fixedly arranged on the clamping seat; a notch is arranged on the partition plate, two rows of central rollers are fixedly arranged in the notch, tapered correction rollers are rotatably arranged on the two sides of the partition plate, the tips of the correction rollers are directed towards the partition plate, the correction roller comprises a rotating shaft and a wear-resistant sleeve, one end of the rotating shaft is formed with a tapered guide portion and an annular abutting portion, the abutting portion is located between the guide portion and the partition plate, the other end of the rotating shaft is fixedly sleeved with the wear-resistant sleeve, an outer spiral groove is formed in the outer wall of the wear-resistant sleeve, and a spiral polishing portion is formed in the outer wall of the wear-resistant sleeve; and the application can correct the gap before welding.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of welding devices, and particularly relates to a high-frequency induction welding device for steel pipes. BACKGROUND

[0002] In the process of steel pipe production, first, a strip-shaped steel belt is flattened and conveyed through upper and lower parallel rollers, then the belt is rolled on both sides and the upper and lower sides to gradually form a cylindrical steel pipe, then the gap of the steel pipe is heated and melted through induction welding, then the gap is extruded together to form a welding rib through extrusion, so that the gap is eliminated, the steel pipe forms a closed whole, finally, the welding rib is scraped off by a scraper, thereby completing the preliminary production of the steel pipe; when welding the gap of the steel pipe, the two sides of the gap need to be aligned, but generally, the steel pipe is extruded from both sides through rolling, so that the gap is closed, which makes the alignment of the gap not very accurate, thereby reducing the quality of the welded steel pipe and increasing subsequent processing steps. SUMMARY

[0003] In view of the above problems, the high-frequency induction welding device for steel pipes is provided to overcome the defects of the prior art and effectively solve the problem that the gap is closed by extruding the steel pipe from both sides, which makes the alignment of the gap not very accurate, thereby reducing the quality of the welded steel pipe.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: a high-frequency induction welding device for steel pipes, comprising a base, a rolling unit, a clamping unit and a welding unit are sequentially arranged on the base, the clamping unit comprises a clamping seat, a clamping mechanism and a partition plate, the clamping seat is fixed on the base, the clamping mechanism comprises two clamping rollers, both clamping rollers are rotatably arranged on the clamping seat, the partition plate is fixedly arranged on the clamping seat, a notch is arranged on the partition plate, two rows of center rollers are fixedly arranged in the notch, tapered correction rollers are rotatably arranged on both sides of the partition plate, the tips of the correction rollers face the partition plate, the correction roller comprises a rotating shaft and a wear-resistant sleeve, the rotating shaft is rotatably arranged on the partition plate, a tapered guide portion and an annular abutting portion are formed at one end of the rotating shaft, the abutting portion is located between the guide portion and the partition plate, the wear-resistant sleeve is fixedly sleeved at the other end of the rotating shaft, an outer spiral groove is formed on the outer wall of the wear-resistant sleeve, and a spiral grinding portion is formed on the outer wall of the wear-resistant sleeve.

[0005] Preferably, an inner spiral groove is formed in the wear-resistant sleeve, the inner spiral groove is located on the inner side of the grinding portion, and a liquid is injected into the inner spiral groove; the wear-resistant sleeve is made of wear-resistant rubber material.

[0006] Preferably, conveying mechanisms and outer grinding mechanisms are arranged on both sides of the partition plate.

[0007] Preferably, the conveying mechanism includes multiple straightening rollers, all of which are rotatably disposed on both sides of the partition.

[0008] Preferably, the external grinding mechanism includes two straightening rollers, a large gear, a small gear, and a transmission belt. The two straightening rollers are rotatably mounted on the partition plate, and the large gear and small gear are respectively fixed on the two straightening rollers. The large gear and small gear are connected by transmission belt.

[0009] Preferably, the partition plate is provided with an internal grinding mechanism, which includes an elastic bladder and two grinding blocks. The elastic bladder is fixed in the groove, and the two grinding blocks are respectively fixed on both sides of the elastic bladder.

[0010] Preferably, the internal grinding mechanism is provided in multiple ways, and the partition has an inner cavity and multiple channels. The inner cavity is connected to the elastic bladder through the corresponding channels. A telescopic spring and a piston plate are movably arranged in the inner cavity. The telescopic spring is located above the piston plate, and the space in the inner cavity below the piston plate is filled with liquid.

[0011] Preferably, the roller pressing unit includes multiple side roller pressing components and multiple upper and lower roller pressing components. The side roller pressing components include a side support and two side rotating rollers. The side support is fixed on the base, and the two side rotating rollers are rotatably mounted on the side support. The upper and lower roller pressing components include a horizontal support and two horizontal rollers. The horizontal support is fixed on the base, and the two horizontal rollers are rotatably mounted horizontally on the horizontal support.

[0012] Preferably, the welding unit includes a high-frequency sensor, a magnetic rod, an auxiliary frame, two auxiliary rollers, and two pressure rollers. The high-frequency sensor is fixedly installed on the outside of the tube to be welded, the magnetic rod is fixedly installed on the inside of the tube to be welded, the auxiliary frame is fixed on the base, the two auxiliary rollers are rotatably installed on both sides of the auxiliary frame, and the two pressure rollers are rotatably installed on the inside of the auxiliary frame.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. During operation, the straightening rollers and clamping rollers work together to gradually close the gaps in the pipe body and align them together during the clamping and conveying process, thereby achieving the straightening of the gaps before welding and improving the subsequent welding quality.

[0015] 2. During operation, the external and internal grinding mechanisms can be used to grind the outer wall of the pipe during the pipe conveying process, and the internal grinding mechanism can grind the gaps, thereby removing foreign objects inside and outside the gaps and improving the subsequent welding quality. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram:

[0018] Figure 1 This is one of the structural schematic diagrams of a high-frequency induction welding device for steel pipes according to the present invention;

[0019] Figure 2 This is a second schematic diagram of the structure of a high-frequency induction welding device for steel pipes according to the present invention;

[0020] Figure 3 This is one of the schematic diagrams of the mating structure of the clamping unit and welding unit of the present invention;

[0021] Figure 4 This is a second schematic diagram of the mating structure of the clamping unit and welding unit of the present invention;

[0022] Figure 5 This is one of the schematic diagrams of the partition structure of the present invention;

[0023] Figure 6 This is a second schematic diagram of the partition structure of the present invention;

[0024] Figure 7 For the present invention Figure 5 Schematic diagram of the mid-section structure;

[0025] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle;

[0026] Figure 9 This is a schematic diagram of the straightening roller structure of the present invention;

[0027] Figure 10 This is a schematic diagram of the internal grinding mechanism of the present invention.

[0028] In the diagram: 1. Base; 2. Clamping seat; 3. Partition plate; 4. Clamping roller; 5. Groove; 6. Center roller; 7. Straightening roller; 8. Rotating shaft; 9. Wear-resistant sleeve; 10. Guide part; 11. Abutting part; 12. Outer spiral groove; 13. Grinding part; 14. Inner spiral groove; 15. Large gear; 16. Small gear; 17. Transmission belt; 18. Elastic bladder; 19. Grinding block; 20. Inner cavity; 21. Channel; 22. Telescopic spring; 23. Piston plate; 24. Side support; 25. Side rotating roller; 26. Horizontal support; 27. Horizontal roller; 28. High-frequency sensor; 29. ​​Magnetic rod; 30. Auxiliary frame; 31. Auxiliary roller; 32. Pressure roller; 33. Tube body. Detailed Implementation

[0029] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] In the steel pipe production process, a long strip of steel is first flattened and conveyed from above and below by parallel rollers. Then, the strip is rolled from both sides and from both above and below, gradually forming a cylindrical steel pipe. Next, induction welding is used to heat and melt the gap after the steel pipe is joined together. Then, extrusion is used to press the two sides of the gap together to form a weld bead, thus eliminating the gap and forming a closed whole steel pipe. Finally, a scraper is used to remove the weld bead, completing the initial production of the steel pipe. When welding the gap of the steel pipe, it is necessary to align the two sides of the gap. However, the steel pipe is usually pressed from both sides by rollers to close the gap. This makes the alignment of the gap less precise, which leads to a decrease in the quality of the welded steel pipe and increases the number of subsequent processing steps.

[0031] Depend on Figures 1-10 This invention relates to a high-frequency induction welding device for steel pipes, comprising a base 1, on which a roller pressing unit, a clamping unit, and a welding unit are sequentially arranged. The clamping unit includes a clamping seat 2, a clamping mechanism, and a partition plate 3. The clamping seat 2 is fixed to the base 1. The clamping mechanism includes two clamping rollers 4, both of which are rotatably mounted on the clamping seat 2. The partition plate 3 is fixed to the clamping seat 2 and has a groove 5. Two rows of central rollers 6 are fixedly arranged in the groove 5. Both sides of the partition 3 are provided with conical straightening rollers 7, with the tips of the straightening rollers 7 facing the partition 3. The straightening rollers 7 include a rotating shaft 8 and a wear-resistant sleeve 9. The rotating shaft 8 is rotatably mounted on the partition 3. One end of the rotating shaft 8 forms a conical guide part 10 and an annular pressing part 11. The pressing part 11 is located between the guide part 10 and the partition 3. The other end of the rotating shaft 8 is fixedly fitted with a wear-resistant sleeve 9. The outer wall of the wear-resistant sleeve 9 forms an outer spiral groove 12 and a spiral grinding part 13.

[0032] In this design, during use, the roll forming unit conveys and rolls the tube 33 to be formed, gradually shaping the belt into a cylindrical tube 33. At this point, a gap to be welded is formed at the center of the top of the tube 33. When the tube 33 passes through the clamping unit, it is clamped and corrected to align the two sides of the gap, thereby improving the subsequent welding quality. Then, the corrected gap is subjected to high-frequency induction welding by the welding unit. Finally, the weld beads generated by the welding are removed by the scraper device, completing the steel pipe production process. Some roll forming units are equipped with drive motors to provide power. The spiral directions of the outer spiral grooves 12 on the straightening rollers 7 on both sides of the partition 3 are the same or opposite, so that the straightening rollers 7 on both sides can jointly convey the tube 33.

[0033] The working process of the clamping unit is as follows:

[0034] During installation, the partition 3 is located in the gap of the tube body 33. When the tube body 33 passes through the two clamping rollers 4, the rolling and squeezing action of the two clamping rollers 4 causes the two sides of the tube body 33 to tend to close towards the gap, so that the two sides of the gap of the tube body 33 abut against the center rollers 6 on both sides of the partition 3, achieving initial adjustment of the gap. The center rollers 6 on both sides of the partition 3 can be staggered to reduce the space occupied during installation. At the same time, as the tube body 33 moves, the tube body 33 is subjected to friction. The force drives the straightening roller 7 to rotate. Since the straightening roller 7 is conical in shape and is equipped with the outer spiral groove 12, when the straightening roller 7 abuts against the tube body 33 from above, the pressure generated by the straightening roller 7 on the tube body 33 will cause the gap of the tube body 33 to have a closed inclination. This causes the side of the gap to be located below the pressing part 11 after passing through the guide part 10. The pressing part 11 presses against the gap of the tube body 33 from above, so that the two sides of the gap are at the same height, thus completing the straightening operation of the gap.

[0035] It should be noted that when the edge of the gap in the tube 33 is blocked by the central roller 6, the straightening roller 7 will move slightly relative to the tube 33 in its own axial direction, thereby polishing the outer wall of the tube 33 to a certain extent through the grinding part 13 on the straightening roller 7; a straightening roller 7 can also be set below the tube 33, and there is also pressure between the lower straightening roller 7 and the inner wall of the tube 33. In this way, the upper and lower straightening rollers 7 work together to achieve the straightening operation of the tube 33.

[0036] Considering that the area on the tube 33 that contacts the straightening roller 7 is arc-shaped, in order to make the pressure between the straightening roller 7 and the wear-resistant sleeve 9 evenly distributed, an inner spiral groove 14 is formed in the wear-resistant sleeve 9. The inner spiral groove 14 is located inside the grinding part 13 and is filled with liquid. The wear-resistant sleeve 9 is made of wear-resistant rubber.

[0037] With this design, when the wear-resistant sleeve 9 abuts against the tube body 33, under the action of the liquid in the inner spiral groove 14, since the pressure in the liquid is equal, the pressure in the area with excessive pressure can be transferred to the area with insufficient pressure through the liquid, thereby improving the pressure uniformity between the two and making the tube body 33 relatively uniform in force.

[0038] Considering that the gap in the tube 33 is formed by the two sides of the belt, and that foreign objects may be attached to the two sides of the belt during transportation, which would affect the quality of welding if not treated, a conveying mechanism and an external grinding mechanism are provided on both sides of the partition plate 3, with the conveying mechanism and the external grinding mechanism set at intervals.

[0039] Specifically, the conveying mechanism includes multiple straightening rollers 7, which are rotatably mounted on both sides of the partition 3. This design facilitates the roller pressing and conveying of the tube 33 by the multiple straightening rollers 7, so that the gaps in the tube 33 gradually close.

[0040] It should be noted that the dimensions of the multiple straightening rollers 7 in the axial direction gradually decrease, which causes the closure of the gap in the tube 33 to change gradually.

[0041] Specifically, the external grinding mechanism includes two straightening rollers 7, a large gear 15, a small gear 16, and a transmission belt 17. Both straightening rollers 7 are rotatably mounted on the partition plate 3. The large gear 15 and the small gear 16 are respectively fixed on the two straightening rollers 7. The large gear 15 and the small gear 16 are connected by the transmission belt 17.

[0042] With this design, during use, the tube body 33 drives one of the straightening rollers 7 to rotate through friction. The large gear 15 on the straightening roller 7 drives the small gear 16 on the other straightening roller 7 to rotate through the transmission belt 17, causing the other straightening roller 7 to slide relative to the tube body 33. The grinding part 13 on the other straightening roller 7 grinds the outside of the gap in the tube body 33.

[0043] It should be noted that the contact pressure between the straightening roller 7 with the large gear 15 and the tube body 33 is greater than the contact pressure between the straightening roller 7 with the small gear 16 and the tube body 33, which ensures the stable progress of grinding.

[0044] To further improve the polishing effect at the gaps, an internal polishing mechanism is provided on the partition 3. The internal polishing mechanism includes an elastic bladder 18 and two polishing blocks 19. The elastic bladder 18 is fixed inside the groove 5, and the two polishing blocks 19 are respectively fixed on both sides of the elastic bladder 18. With this design, the polishing blocks 19 can be made to abut against the gaps of the tube body 33 for polishing under the action of the elastic bladder 18.

[0045] Furthermore, the internal grinding mechanism is provided in multiple ways. The partition plate 3 has an inner cavity 20 and multiple channels 21. The inner cavity 20 is connected to the elastic bladder 18 through the corresponding channel 21. The inner cavity 20 is equipped with a telescopic spring 22 and a piston plate 23. The telescopic spring 22 is located above the piston plate 23, and the space in the inner cavity 20 below the piston plate 23 is filled with liquid.

[0046] With this design, under the action of the telescopic spring 22, the piston plate 23 transmits pressure to the interior of the elastic bladder 18 through the liquid, so that the grinding block 19 always abuts against the gap with a certain force, ensuring the grinding effect; and a liquid injection port with a sealing plug can be opened on the outside of the inner cavity 20 to facilitate the injection of liquid into the inner cavity 20.

[0047] Specifically, the roller pressing unit includes multiple side roller pressing components and multiple upper and lower roller pressing components. The side roller pressing components include a side support 24 and two side rotating rollers 25. The side support 24 is fixed on the base 1, and the two side rotating rollers 25 are rotatably mounted on the side support 24. The upper and lower roller pressing components include a horizontal support 26 and two horizontal rollers 27. The horizontal support 26 is fixed on the base 1, and the two horizontal rollers 27 are rotatably mounted horizontally on the horizontal support 26.

[0048] With this design, multiple side-rotating rollers 25 continuously roll the tube body 33 from both sides, and multiple horizontal rollers 27 roll the tube body 33 from above and below, so that the tube body 33 gradually forms a cylindrical steel pipe.

[0049] Specifically, the welding unit includes a high-frequency sensor 28, a magnetic rod 29, an auxiliary frame 30, two auxiliary rollers 31, and two pressure rollers 32. The high-frequency sensor 28 is fixedly installed on the outside of the tube body 33 to be welded, the magnetic rod 29 is fixedly installed on the inside of the tube body 33 to be welded, the auxiliary frame 30 is fixed on the base 1, the two auxiliary rollers 31 are rotatably installed on both sides of the auxiliary frame 30, and the two pressure rollers 32 are rotatably installed on the inside of the auxiliary frame 30.

[0050] With this design, the high-frequency inductor 28, which is a ring fitted around the outside of the tube 33, heats the gap of the tube 33 through AC skin effect, i.e., high-frequency induction heating. The magnetic rod 29 allows the heating to be concentrated at the gap, thereby melting both sides of the gap of the tube 33. Then, the pressure of the auxiliary roller 31 and the pressure roller 32 causes the two sides of the gap to come together, thus completing the high-frequency induction welding process.

[0051] It should be noted that water needs to be injected at multiple locations in the tube 33 during the process, on the one hand to rinse the inside of the tube 33, and on the other hand to cool it down; the magnetic rod 29 can be fixed on the partition 3, and the high-frequency sensor 28 can also be fixed at the required location, such as on the auxiliary frame 30 or the side bracket 24, through the connecting frame.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-frequency induction welding device for steel pipes, comprising a base (1), on which a roller pressing unit, a clamping unit, and a welding unit are sequentially arranged, the clamping unit comprising a clamping seat (2), a clamping mechanism, and a partition (3), the clamping seat (2) being fixed on the base (1), the clamping mechanism comprising two clamping rollers (4), both clamping rollers (4) being rotatably mounted on the clamping seat (2), and the partition (3) being fixed on the clamping seat (2), characterized in that, The partition (3) is provided with a groove (5), and two rows of central rollers (6) are fixedly provided in the groove (5). Conical straightening rollers (7) are rotatably provided on both sides of the partition (3). The tip of the straightening roller (7) faces the partition (3). The straightening roller (7) includes a rotating shaft (8) and a wear-resistant sleeve (9). The rotating shaft (8) is rotatably provided on the partition (3). One end of the rotating shaft (8) forms a conical guide part (10) and an annular pressing part (11). The pressing part (11) is located between the guide part (10) and the partition (3). The other end of the rotating shaft (8) is fixedly fitted with a wear-resistant sleeve (9). The outer wall of the wear-resistant sleeve (9) forms an outer spiral groove (12). The outer wall of the wear-resistant sleeve (9) forms a spiral grinding part (13). The partition (3) is provided with an internal grinding mechanism, which includes an elastic bladder (18) and two grinding blocks (19). The elastic bladder (18) is fixed inside the slot (5), and the two grinding blocks (19) are fixed on both sides of the elastic bladder (18). The internal grinding mechanism is provided with multiple internal cavities. The partition (3) has an internal cavity (20) and multiple channels (21). The internal cavity (20) is connected to the elastic bladder (18) through the corresponding channel (21). The internal cavity (20) is equipped with a telescopic spring (22) and a piston plate (23). The telescopic spring (22) is located above the piston plate (23), and the space in the internal cavity (20) below the piston plate (23) is filled with liquid.

2. The high-frequency induction welding device for steel pipes according to claim 1, characterized in that, The wear-resistant sleeve (9) has an inner spiral groove (14) inside, which is located inside the grinding part (13) and is filled with liquid; the wear-resistant sleeve (9) is made of wear-resistant rubber.

3. The high-frequency induction welding device for steel pipes according to claim 1, characterized in that, Both sides of the partition (3) are provided with a conveying mechanism and an external grinding mechanism, which are spaced apart.

4. The high-frequency induction welding device for steel pipes according to claim 3, characterized in that, The conveying mechanism includes multiple straightening rollers (7), which are rotatably disposed on both sides of the partition (3).

5. The high-frequency induction welding device for steel pipes according to claim 3, characterized in that, The external grinding mechanism includes two straightening rollers (7), a large gear (15), a small gear (16), and a transmission belt (17). The two straightening rollers (7) are rotatably mounted on the partition plate (3). The large gear (15) and the small gear (16) are respectively fixed on the two straightening rollers (7). The large gear (15) and the small gear (16) are connected by transmission belt (17).

6. The high-frequency induction welding device for steel pipes according to claim 1, characterized in that, The roller pressing unit includes multiple side roller pressing components and multiple upper and lower roller pressing components. The side roller pressing components include a side support (24) and two side rotating rollers (25). The side support (24) is fixed on the base (1), and the two side rotating rollers (25) are rotatably mounted on the side support (24). The upper and lower roller pressing components include a horizontal support (26) and two horizontal rollers (27). The horizontal support (26) is fixed on the base (1), and the two horizontal rollers (27) are rotatably mounted horizontally on the horizontal support (26).

7. The high-frequency induction welding device for steel pipes according to claim 1, characterized in that, The welding unit includes a high-frequency sensor (28), a magnetic rod (29), an auxiliary frame (30), two auxiliary rollers (31) and two pressure rollers (32). The high-frequency sensor (28) is fixedly installed on the outside of the tube body (33) to be welded, the magnetic rod (29) is fixedly installed on the inside of the tube body (33) to be welded, the auxiliary frame (30) is fixed on the base (1), the two auxiliary rollers (31) are rotatably installed on both sides of the auxiliary frame (30), and the two pressure rollers (32) are rotatably installed on the inside of the auxiliary frame (30).

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