Induction heating coil for machining small-bending-radius bent pipe

Abstract

The utility model relates to an induction heating coil for processing a small-bending-radius elbow, which comprises a connecting plate and a main ring, the main ring is fixedly connected with the connecting plate, the main ring is in a circular ring shape, the axis of the main ring is parallel to the front-back direction, the main ring is fixedly connected with a first auxiliary ring and a second auxiliary ring, and the first auxiliary ring and the second auxiliary ring are fixedly connected. The first auxiliary ring and the second auxiliary ring are located on the front side and the rear side of the main ring respectively, the first auxiliary ring, the second auxiliary ring and the main ring are coaxially arranged, the first auxiliary ring and the second auxiliary ring are both in a semicircular ring shape, and the first auxiliary ring and the second auxiliary ring are both located on the right side of the axis of the main ring. The bending device is suitable for workpieces with different wall thicknesses by adjusting the number of the second auxiliary rings, the application range is expanded, the first auxiliary rings and the second auxiliary rings are arranged on the front side and the rear side of the main ring, the center of an inner arc red belt of the workpiece coincides with the center of a forming area, workpiece forming is facilitated, and the workpiece bending effect is improved.

Description

Technical Field

[0001] The utility model relates to an induction heating coil used for processing small bending radius pipes, belonging to the technical field of induction coils. Background Art

[0002] With the development of economy and technology, the requirements for pipeline design are getting higher and higher, resulting in higher requirements for pipe fittings for pipeline turning. Compared with elbows, pipe bends have the advantages of controllable size, reduced number of welds, and convenient later in-service inspection. Among them, R / D ≥ 3 is a large bending radius bend (R / D is the bending radius ratio), and R / D < 3 is a small bending radius bend. When the pipe is bent, the pipe is heated by medium-frequency induction of the induction coil.

[0003] The Chinese utility model patent with the publication number CN204350344U discloses a heating induction coil, which includes a main coil and an auxiliary coil. The upper end of the main coil is connected to the medium frequency quenching transformer through a copper bar. The front inner coil of the main coil is provided with a plurality of cooling medium injection holes arranged evenly, and the front outer coil of the main coil is provided with a plurality of cooling medium inlets arranged evenly. The auxiliary coil is semi-elliptical in shape, and the two ends of the auxiliary coil are respectively connected to the upper and lower ends of the main coil to the right. The auxiliary coil is located outside the left half of the main coil, and the left half of the main coil is provided with a self-cooling water pipe of the left half of the main coil on the left periphery, and a red band control water or air cooling pipe is provided on the rear periphery of the left half of the main coil. The utility model heating induction coil has the advantages of proper red band distribution during medium frequency pipe bending, which will not cause bulging of the steel pipe and make the small radius pipe bending smoothly. However, the prior art can only be applied to pipe bending within a specific wall thickness range, and in the bending process, there is a deviation between the forming force center of the workpiece and the center position of the inner arc red band, which is not conducive to pipe bending and affects the bending effect.

[0004] Therefore, there is a need for an induction heating coil for small bending radius pipe bending processing to expand the scope of application and improve the bending effect. Summary of the invention

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies of the prior art, an induction heating coil for processing small bending radius pipes is provided to expand the scope of application and improve the bending effect.

[0006] The technical solution adopted by the utility model to solve the above-mentioned problem is: an induction heating coil for small bending radius pipe bending processing, comprising a connecting plate and a main ring, the main ring is fixedly connected to the connecting plate, the main ring is annular, the axis of the main ring is parallel to the front and rear directions, the main ring is fixedly connected with a first sub-ring and a second sub-ring, the first sub-ring and the second sub-ring are respectively located on the front and rear sides of the main ring, the first sub-ring and the second sub-ring are coaxially arranged with the main ring, the first sub-ring and the second sub-ring are both semi-circular, and the first sub-ring and the second sub-ring are both located on the right side of the main ring axis.

[0007] Preferably, a first cooling pipe is fixedly arranged on the connecting plate.

[0008] Preferably, a second cooling pipe is provided on the connecting plate, a cold source outlet connecting end is provided on the second secondary ring, and the second cooling pipe is connected to the second secondary ring.

[0009] Preferably, a first cold source connection end is provided on the outer side wall of the main ring, and a first cooling hole is provided on the front side of the main ring, and the first cooling hole is located on the left side of the axis of the main ring.

[0010] Preferably, a plurality of the first cooling holes are provided, and the plurality of first cooling holes are evenly distributed circumferentially with the axis of the main ring as the center.

[0011] Preferably, the diameter of the first cooling hole is 1.6 mm to 1.8 mm.

[0012] Preferably, a second cold source connection end is provided on the outer side wall of the first sub-ring, and a second cooling hole is provided on the front side of the first sub-ring.

[0013] Preferably, a plurality of the second cooling holes are provided, and the plurality of second cooling holes are evenly distributed circumferentially around the axis of the first secondary ring.

[0014] Preferably, the second cooling holes have a diameter of 1.6 mm to 1.8 mm.

[0015] Preferably, the main ring, the first sub-ring and the second sub-ring are all copper square tubes.

[0016] Compared with the prior art, the advantages of the utility model are: by adjusting the number of second sub-rings, it is suitable for workpieces with different wall thicknesses, thereby expanding the scope of application; moreover, the first sub-ring and the second sub-ring are arranged on the front and rear sides of the main ring so that the center of the inner arc red band of the workpiece coincides with the center of the forming area, thereby facilitating the forming of the workpiece and improving the bending effect of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of an induction heating coil for processing small bending radius pipes according to the utility model;

[0018] Figure 2 This is a cross-sectional view of an induction heating coil for processing small bending radius pipes according to the utility model;

[0019] Figure 3 The main view of the main circle;

[0020] Figure 4 is a cross-sectional view of the main circle;

[0021] Figure 5 for Figure 4 A magnified view of part A;

[0022] Figure 6 This is the main view of the first sub-circle;

[0023] Figure 7 is a cross-sectional view of the first secondary ring;

[0024] Figure 8 for Figure 7 A magnified view of part B;

[0025] Fig. 9 This is the main view of the second sub-circle.

[0026] in:

[0027] Connecting plate 1, main ring 2, first cooling pipe 3, cold source outlet connection end 4, first sub-ring 5, second sub-ring 6, second cooling pipe 7, first cold source connection end 8, first cooling hole 9, second cold source connection end 10, second cooling hole 11. DETAILED DESCRIPTION

[0028] like Figure 1-9 As shown, in this embodiment, an induction heating coil for small bending radius pipe bending processing includes a connecting plate 1 and a main ring 2, the main ring 2 is fixedly connected to the connecting plate 1, a first cooling tube 3 is fixedly arranged on the connecting plate 1, the main ring 2 is annular, the axis of the main ring 2 is parallel to the front and rear direction, a first sub-ring 5 and a second sub-ring 6 are fixedly connected to the main ring 2, the first sub-ring 5 and the second sub-ring 6 are respectively located at the front and rear sides of the main ring 2, the first sub-ring 5 and the second sub-ring 6 are coaxially arranged with the main ring 2, the first sub-ring 5 and the second sub-ring 6 are both semi-circular, and the first sub-ring 5 and the second sub-ring 6 are both located on the right side of the axis of the main ring 2;

[0029] The connecting plate 1 is provided with a second cooling pipe 7, the second secondary ring 6 is provided with a cold source outlet connection end 4, and the second cooling pipe 7 is connected to the second secondary ring 6;

[0030] A first cold source connection end 8 is provided on the outer wall of the main ring 2, and a plurality of first cooling holes 9 are provided on the front side of the main ring 2. The plurality of first cooling holes 9 are located on the left side of the axis of the main ring 2, and the plurality of first cooling holes 9 are evenly distributed circumferentially with the axis of the main ring 2 as the center;

[0031] A second cold source connection end 10 is provided on the outer wall of the first sub-ring 5, and a plurality of second cooling holes 11 are provided on the front side of the first sub-ring 5. The plurality of second cooling holes 11 are evenly distributed circumferentially with the axis of the first sub-ring 5 as the center.

[0032] The apertures of the first cooling hole 9 and the second cooling hole 11 are both 1.6 mm to 1.8 mm;

[0033] Working principle: the workpiece passes through the second sub-ring 6, the main ring 2 and the first sub-ring 5 coaxially from front to back in sequence. The second sub-ring 6, the main ring 2 and the first sub-ring 5 are all provided with heating devices. Heat is generated by the heating devices and acts on the workpiece. At the same time, the cold source is transported from one of the second cooling pipes 7 to the second sub-ring 6 and then discharged from the cold source outlet connection end 4. The cold source absorbs the heat on the second sub-ring 6 to achieve cooling of the second sub-ring 6. Of course, the cold source can also be transported from the cold source outlet connection end 4 to the second sub-ring 6 and then discharged from the second cooling pipe 7. The cold source is also input from one end of the first cooling pipe 3 and then discharged from the other end of the first cooling pipe 3. The heat on the connecting plate 1 is transferred to the first The cooling tube 3 is then absorbed by the cold source, so as to realize the cooling of the connecting plate 1. The cold source is also transported from the first cooling connection end to the main ring 2 and then discharged from the first cooling hole 9, so as to realize the cooling of the main ring 2. The cold source is discharged from the first cooling hole 9 and then acts on the workpiece, so as to realize the cooling of the workpiece. The cold source is also transported from the second cooling connection end to the first sub-ring 5 and then discharged from the second cooling hole 11, so as to realize the cooling of the first sub-ring 5. The cold source discharged from the second cooling hole 11 acts on the workpiece, so as to realize the cooling of the workpiece. In fact, when the cold source is discharged from the second cooling hole 11 and the cold source is discharged from the first cooling hole 9 and acts on the workpiece, an annular cooling area is formed on the outer peripheral wall of the workpiece, so as to improve the cooling effect.

[0034] The cooling source can be water or air;

[0035] The workpiece bending position is located at the main circle 2, that is, the center of the forming area of ​​the workpiece is located at the main circle 2, and the workpiece is heated simultaneously by the first sub-circle 5 and the second sub-circle 6 on both sides of the main circle 2, so that the center of the inner arc red band of the workpiece is also located at the main circle 2, that is, the center of the inner arc red band of the workpiece coincides with the center of the forming area, which facilitates the forming of the workpiece and improves the bending effect of the workpiece;

[0036] When bending workpieces with different wall thicknesses, a second secondary ring 6 can be added to the front side wall of the original second secondary ring 6. The number of the added second secondary rings 6 is determined according to the wall thickness of the workpiece. The added second secondary rings 6 are fixedly connected from front to back by lead welding, and there is no need to make a new induction ring.

[0037] The main coil 2, the first sub-coil 5 and the second sub-coil 6 are all copper square tubes, which can reduce the difficulty of production and increase the strength compared with the traditional induction coil made of copper plates.

[0038] In summary, the induction heating coil for small bending radius pipe bending processing is suitable for workpieces with different wall thicknesses by adjusting the number of second sub-circles 6, thereby expanding the scope of application. Moreover, the first sub-circle 5 and the second sub-circle 6 are arranged on the front and rear sides of the main circle 2 so that the center of the inner arc red band of the workpiece coincides with the center of the forming area, which facilitates the forming of the workpiece and improves the bending effect of the workpiece.

[0039] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An induction heating coil for small bending radius pipe bending, comprising a connecting plate (1) and a main ring (2), wherein the main ring (2) is fixedly connected to the connecting plate (1), the main ring (2) is annular, and the axis of the main ring (2) is parallel to the front-rear direction, characterized in that: The main circle (2) is fixedly connected with a first sub-circle (5) and a second sub-circle (6); the first sub-circle (5) and the second sub-circle (6) are respectively located at the front and rear sides of the main circle (2); the first sub-circle (5) and the second sub-circle (6) are coaxially arranged with the main circle (2); the first sub-circle (5) and the second sub-circle (6) are both semicircular; and the first sub-circle (5) and the second sub-circle (6) are both located on the right side of the axis of the main circle (2).

2. The induction heating coil for small bending radius pipe bending according to claim 1, characterized in that: A first cooling pipe (3) is fixedly arranged on the connecting plate (1).

3. The induction heating coil for small bending radius pipe bending according to claim 1, characterized in that: The connecting plate (1) is provided with a second cooling pipe (7), the second secondary loop (6) is provided with a cold source outlet connection end (4), and the second cooling pipe (7) is connected to the second secondary loop (6).

4. The induction heating coil for small bending radius pipe bending according to claim 1, characterized in that: A first cold source connection end (8) is provided on the outer side wall of the main ring (2), and a first cooling hole (9) is provided on the front side of the main ring (2), wherein the first cooling hole (9) is located on the left side of the axis of the main ring (2).

5. The induction heating coil for small bending radius pipe bending according to claim 4, characterized in that: A plurality of the first cooling holes (9) are provided, and the plurality of first cooling holes (9) are evenly distributed in the circumferential direction with the axis of the main ring (2) as the center.

6. The induction heating coil for small bending radius pipe bending according to claim 4, characterized in that: The diameter of the first cooling hole (9) is 1.6 mm to 1.8 mm.

7. The induction heating coil for small bending radius pipe bending according to claim 1, characterized in that: A second cold source connection end (10) is provided on the outer side wall of the first secondary ring (5), and a second cooling hole (11) is provided on the front side of the first secondary ring (5).

8. The induction heating coil for small bending radius pipe bending according to claim 7, characterized in that: A plurality of the second cooling holes (11) are provided, and the plurality of second cooling holes (11) are evenly distributed in the circumferential direction with the axis of the first secondary ring (5) as the center.

9. The induction heating coil for small bending radius pipe bending according to claim 7, characterized in that: The second cooling holes (11) have a diameter of 1.6 mm to 1.8 mm.

10. The induction heating coil for small bending radius pipe bending according to claim 1, characterized in that: The main ring (2), the first auxiliary ring (5) and the second auxiliary ring (6) are all copper square tubes.

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