An efficient and precise induction heating device for local parts of the edges and corners of square steel pipes

Abstract

The present invention discloses a local high-efficiency and precise induction heating device for the edges and corners of square steel pipes, which includes induction heating units distributed at the four corners of the square steel pipe and load-bearing brackets distributed on both sides of the square steel pipe. The induction heating units are electrically connected to the IGBT induction heating power supply through transformers. The load-bearing brackets include a frame and an upper movable unit and a lower movable unit arranged in the frame. The induction heating units are fixedly connected to the upper movable unit and the lower movable unit respectively. The induction heating unit includes an inductor, a special-shaped magnetic conductor, and an extension plate. The cross-section of the special-shaped magnetic conductor is U-shaped, the inductor is nested in the recess of the special-shaped magnetic conductor, the inductor faces the square steel pipe, the extension plates are fixed on both sides of the special-shaped magnetic conductor, and a reflective layer is attached to the inner side of the extension plates. The local high-efficiency and precise induction heating device for the edges and corners of square steel pipes with the above structure can precisely heat the edges and corners of the square steel pipe, reduce energy consumption while improving the yield rate, and improve the product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of induction heating, and in particular to a local high-efficiency and precise induction heating device for the edges and corners of square steel pipes. Background Art

[0002] In the steel pipe production industry, the production of square steel pipes accounts for a large proportion. In the production of square steel pipes, what kind of heating method to use when processing round-corner square steel pipes into sharp-corner square steel pipes has been a problem that has plagued the industry for a long time. Previously, all manufacturers used overall heating to soften the steel pipes and then extruded them into shape. This has caused two problems. One is high energy consumption. Because only the edges and corners of the steel pipes need to be deformed, but due to the limitations of heating technology, only overall heating can be used, resulting in a great waste of electric energy. The other is that after overall heating, the four planes of the square steel pipes are deformed and uneven, and secondary shaping is required, which is laborious and time-consuming, and the yield rate decreases. Moreover, due to the variety of steel pipe models produced by manufacturers, there are also certain requirements for the flexibility of heating equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a local high-efficiency and precise induction heating device for the edges and corners of square steel pipes, which can accurately heat the edges and corners of square steel pipes, reduce energy consumption while improving the yield rate and product quality.

[0004] To achieve the above purpose, the present invention provides a local high-efficiency and precise induction heating device for the edges and corners of square steel pipes, including induction heating units distributed at the four corners of the square steel pipe and load-bearing brackets distributed on both sides of the square steel pipe. The induction heating units are electrically connected to the IGBT induction heating power supply through transformers. The load-bearing brackets include a frame and an upper movable unit and a lower movable unit arranged in the frame. The induction heating units are fixedly connected to the upper movable unit and the lower movable unit respectively. The induction heating units are placed at an inclination of 45° or 135°. The induction heating unit includes an inductor, a special-shaped magnetic conductor, and an extension plate. The cross-section of the special-shaped magnetic conductor is U-shaped. The inductor is nested in the recess of the special-shaped magnetic conductor. The inductor faces the square steel pipe. The extension plates are fixed on both sides of the special-shaped magnetic conductor, and a reflective layer is attached to the inner side of the extension plates.

[0005] Preferably, the frame includes a bottom side bar, side bar perpendicular to and fixedly connected to both ends of the bottom side, a middle connecting bar, and a top side bar arranged at the top of the side bar. The top side bar is perpendicularly and fixedly connected to the top of the side bar. Both ends of the middle connecting bar are perpendicularly and fixedly connected to the middle of the side bar. The length of the bottom side bar is greater than the length of the top side bar.

[0006] Preferably, the upper movable unit includes an upper movable rod and an upper adjusting screw rod. The upper movable rod is arranged between the middle connecting rod and the top edge rod. A fixed screw rod seat is arranged in the center above the upper movable rod. The bottom of the upper adjusting screw rod is threadedly connected to the fixed screw rod seat 52. The upper adjusting screw rod passes through the upper movable rod, and the top of the upper adjusting screw rod passes upward through the top edge rod. The top end of the upper adjusting screw rod is linked with a rotating motor, and the rotating motor is fixed on the top edge rod.

[0007] Preferably, the lower movable unit includes a lower fixed rod, a lower movable rod, and a lower adjusting screw rod. The two ends of the lower fixed rod are respectively fixedly connected to the side rods. The lower movable rod is arranged between the middle connecting rod and the lower fixed rod. The lower adjusting screw rod passes through the lower fixed rod and the lower movable rod, and the lower adjusting screw rod is threadedly connected to the lower movable rod. An adjusting turntable is arranged at the bottom of the lower adjusting screw rod. Limiting shims are respectively arranged on the inner sides of the side rods, and the limiting shims are located between the lower fixed rod and the lower movable rod.

[0008] Preferably, fixed sleeves are respectively arranged on both sides below the upper movable rod and on both sides above the lower movable rod. An inner support tube is arranged in the fixed sleeve. The inner support tube is fixedly connected to the outer side of the extension plate through an inclined connecting plate. The upper movable unit is located above the induction heating unit, and the lower movable unit is located below the induction heating unit.

[0009] Preferably, I-shaped frames are arranged at both ends of the upper movable rod and the lower movable rod. Axial connecting pieces are vertically arranged at both ends above and below the I-shaped frame, and a roller is arranged between the axial connecting pieces. The roller is in contact with the inner side of the side rod.

[0010] Therefore, the present invention adopts a local high-efficiency and precise induction heating device for the corners of square steel pipes with the above structure. The induction heating units distributed at the corners of the square steel pipes precisely heat the local area of the square steel pipes. The height position of the induction heating units is adjusted through the bearing brackets, so as to locally heat square steel pipes of different models. Compared with the overall heating of square steel pipes, the energy consumption is reduced, energy is saved, and the problems of deformation and unevenness after the overall heating of the steel pipes are avoided, and the yield is improved.

[0011] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of an embodiment of a local high-efficiency and precise induction heating device for the corners of square steel pipes according to the present invention;

[0013] Figure 2Schematic side view of an embodiment of the present invention.

[0014] Reference numerals

[0015] 1. Induction heating unit; 11. Special-shaped magnetic conductor; 12. Inductor; 13. Extension plate; 14. Reflection layer; 15. Diagonal connecting plate; 16. Inner support tube; 17. Fixed sleeve; 2. Carrying bracket; 21. Bottom edge rod; 22. Limit stop; 23. Lower movable rod; 24. Middle connecting rod; 25. Lower fixed rod; 26. Upper movable rod; 27. Top edge rod; 28. Side edge rod; 3. Square steel pipe; 4. I-beam frame; 41. Shaft connecting plate; 42. Roller; 5. Rotating motor; 51. Upper adjusting screw rod; 52. Fixed screw rod seat; 53. Lower adjusting screw rod; 54. Adjusting turntable. Detailed implementation manners

[0016] The technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0017] Embodiment

[0018] As shown in the figure, a high-efficiency and precise induction heating device for the corners of a square steel pipe includes induction heating units 1 distributed at the four corners of the square steel pipe 3 and carrying brackets 2 symmetrically distributed on both sides of the square steel pipe 3.

[0019] The induction heating unit 1 is electrically connected to the IGBT induction heating power supply through a transformer. The induction heating units 1 are respectively placed at an inclination of 45° or 135°. The induction heating unit 1 includes an inductor 12, a special-shaped magnetic conductor 11, and an extension plate 13. The cross-section of the special-shaped magnetic conductor 11 is U-shaped, which reduces the distributed inductance, improves the induction heating ability, and facilitates the realization of directional local heating. The inductor 12 is nested in the recess of the special-shaped magnetic conductor 11. The inductor 12 faces the square steel pipe 3. The inductor 12 is wound with oxygen-free copper tube. The extension plates 13 are fixed on both sides of the special-shaped magnetic conductor 11. The reflection layer 14 is attached to the inner side of the extension plates 13 for reflecting heat and improving the energy utilization rate.

[0020] The square steel pipe 3 with rounded corners is conveyed by a conveying mechanism between the four induction heating units 1 of the square steel pipe 3. After the IGBT induction heating power supply is started, the corner part of the steel pipe is heated to form a bright band. After reaching the hot rolling temperature, the steel pipe enters the hot rolling mechanism, and the corner changes from a rounded corner to a 90° right angle.

[0021] The bearing bracket 2 includes a frame and an upper movable unit and a lower movable unit arranged in the frame. The induction heating unit 1 is fixedly connected to the upper movable unit and the lower movable unit respectively. The frame includes a bottom side rod 21, side rods 28 fixedly connected perpendicularly to both ends of the bottom side, a middle connecting rod 24, and a top side rod 27 arranged at the top of the side rod 28. The top side rod 27 is fixedly connected perpendicularly to the top of the side rod 28. Both ends of the middle connecting rod 24 are fixedly connected perpendicularly to the middle of the side rod 28 to maintain the structural stability of the frame. The length of the bottom side rod 21 is greater than that of the top side rod 27, and it contacts the ground to prevent the frame from tipping over. The components of the frame are fixed by welding.

[0022] The upper movable unit includes an upper movable rod 26 and an upper adjusting screw rod 51. The upper movable rod 26 is arranged between the middle connecting rod 24 and the top side rod 27. A fixed screw rod seat 52 is arranged in the center above the upper movable rod 26. The bottom of the upper adjusting screw rod 51 is threadedly connected to the fixed screw rod seat 52. The top of the upper adjusting screw rod 51 passes upward through the top side rod 27, and the top end of the upper adjusting screw rod 51 is linked to a rotating motor 5. The rotating motor 5 is fixed to the top side rod 27 by screws. When the rotating motor 5 is started, the upper adjusting screw rod 51 rotates, driving the fixed screw rod seat 52 and the upper movable rod 26 to move up and down.

[0023] The lower movable unit includes a lower fixed rod 25, a lower movable rod 23, and a lower adjusting screw rod 53. Both ends of the lower fixed rod 25 are fixedly connected to the side rod 28 by welding. The lower movable rod 23 is arranged between the middle connecting rod 24 and the lower fixed rod 25. The lower adjusting screw rod 53 passes through the lower fixed rod 25 and the lower movable rod 23. The lower adjusting screw rod 53 is threadedly connected to the lower movable rod 23. An adjusting turntable 54 is arranged at the bottom of the lower adjusting screw rod 53. When the adjusting turntable 54 is rotated, the lower adjusting screw rod 53 rotates, driving the lower movable rod 23 to move up and down. The position of the lower movable unit is relatively low, and the height of the lower movable rod 23 can be adjusted manually. The lower adjusting screw rod 53 can also be driven by a belt motor to achieve electric control. I-beams 4 are arranged at both ends of the upper movable rod 26 and the lower movable rod 23. Shaft connecting plates 41 are vertically arranged at both ends above and below the I-beams 4. A roller 42 is arranged between the shaft connecting plates 41. The roller 42 keeps in contact with the inner side of the side rod 28, thereby restricting the displacement direction of the upper movable rod 26 and the lower movable rod 23, reducing the friction with the side rod 28, and making the adjustment process more convenient. Limit stop pieces 22 are respectively arranged on the inner side of the side rod 28. The limit stop pieces 22 are fixedly connected to the side rod 28 by welding. The limit stop pieces 22 are located between the lower fixed rod 25 and the lower movable rod 23. The limit stop pieces 22 are used to limit the extreme downward movement distance of the lower movable rod 23.

[0024] On both sides below the upper movable rod 26 and on both sides above the lower movable rod 23, fixed sleeves 17 are respectively arranged. The fixed sleeves 17 are fixedly welded to the upper movable rod 26 or the lower movable rod 23. An inner support pipe 16 is arranged inside the fixed sleeve 17. The inner support pipe 16 is detachably connected to the fixed sleeve 17 by screws, and the insertion depth of the inner support pipe 16 is changed through a plurality of screw holes, so as to adjust the distance between the induction heating unit 1 and the square steel pipe. The inner support pipe 16 is fixedly connected to the outer side of the extension plate 13 through an inclined connecting plate 15. The inclined connecting plate 15 is fixedly connected to the extension plate 13 and the built-in layer pipe by screws. The upper movable unit is located above the induction heating unit 1, and the lower movable unit is located below the induction heating unit 1. When the upper movable rod 26 and the lower movable rod 23 are driven to move, the connected induction heating unit 1 also moves up and down, realizing the adjustment of the heating distance, so as to adapt to square steel pipes 3 of different sizes and specifications.

[0025] The bottom rod 21 of the bearing bracket 2 can be installed on the track to realize the adjustment of the distance between the two bearing brackets 2.

[0026] Therefore, the present invention adopts a local high-efficiency and precise induction heating device for the edges and corners of a square steel pipe with the above structure. The induction heating unit 1 distributed at the edges and corners of the square steel pipe 3 precisely heats the local part of the square steel pipe 3. By adjusting the height position of the induction heating unit 1 through the bearing bracket 2, local heating is carried out for square steel pipes 3 of different models. Compared with the overall heating of the square steel pipe 3, the energy consumption is reduced, energy is saved, and the problems of deformation and unevenness of the steel pipe after overall heating are avoided, and the yield is improved.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A local high-efficiency and precise induction heating device for the edges and corners of square steel pipes, characterized in that: it includes induction heating units distributed at the four corners of the square steel pipe and load-bearing brackets distributed on both sides of the square steel pipe. The induction heating units are electrically connected to the IGBT induction heating power supply through transformers. The load-bearing brackets include a frame and an upper movable unit and a lower movable unit arranged in the frame. The induction heating units are fixedly connected to the upper movable unit and the lower movable unit respectively. The induction heating units are placed at an inclination of 45° or 135°. The induction heating unit includes an inductor, a special-shaped magnetic conductor, and an extension plate. The cross-section of the special-shaped magnetic conductor is U-shaped. The inductor is nested in the recess of the special-shaped magnetic conductor. The inductor faces the square steel pipe. The inductor is wound with oxygen-free copper tubes. The extension plates are fixed on both sides of the special-shaped magnetic conductor, and a reflective layer is attached to the inner side of the extension plates; the frame includes a bottom side rod, side rods perpendicularly and fixedly connected to both ends of the bottom side, a middle connecting rod, and a top side rod arranged at the top of the side rods. The top side rod is perpendicularly and fixedly connected to the top of the side rod. Both ends of the middle connecting rod are perpendicularly and fixedly connected to the middle of the side rods. The length of the bottom side rod is greater than the length of the top side rod; the upper movable unit includes an upper movable rod and an upper adjusting screw rod. The upper movable rod is arranged between the middle connecting rod and the top side rod. A fixed screw rod seat is arranged in the center above the upper movable rod. The bottom of the upper adjusting screw rod is threadedly connected to the fixed screw rod seat. The upper adjusting screw rod passes through the upper movable rod. The top of the upper adjusting screw rod passes upward through the top side rod. The top end of the upper adjusting screw rod is linked with a rotating motor, and the rotating motor is fixed on the top side rod; the lower movable unit includes a lower fixed rod, a lower movable rod, and a lower adjusting screw rod. Both ends of the lower fixed rod are fixedly connected to the side rods respectively. The lower movable rod is arranged between the middle connecting rod and the lower fixed rod. The lower adjusting screw rod passes through the lower fixed rod and the lower movable rod. The lower adjusting screw rod is threadedly connected to the lower movable rod. An adjusting turntable is arranged at the bottom of the lower adjusting screw rod. Limiting stop pieces are respectively arranged on the inner sides of the side rods, and the limiting stop pieces are located between the lower fixed rod and the lower movable rod; fixed sleeves are respectively arranged on both sides below the upper movable rod and both sides above the lower movable rod. Inner support tubes are arranged in the fixed sleeves. The inner support tubes are fixedly connected to the outer sides of the extension plates through inclined connecting plates. The upper movable unit is located above the induction heating unit, and the lower movable unit is located below the induction heating unit.

2. The local high-efficiency and precise induction heating device for the edges and corners of square steel pipes according to claim 1, characterized in that: both ends of the upper movable rod and the lower movable rod are provided with I-shaped frames. Axial connecting pieces are perpendicularly arranged at both ends above and below the I-shaped frames. A roller is arranged between the axial connecting pieces, and the roller is in contact with the inner side of the side rod.

Images