Induction heating coil with good uniformity

Abstract

The utility model discloses an inductive heating ring with good uniformity, which comprises a heating ring main body and two electrode connecting rods electrically connected with the heating ring main body. The heating ring main body is composed of two circular ring bodies. The two circular ring bodies are coaxial and have the same diameter. The inner ring surface of the circular ring body is located on the same circumference to ensure that the distance between the inner ring surface of the heating ring main body and the surface of the workpiece is the same everywhere. The inductive heating ring effectively avoids the problems of local overheating or insufficient heating caused by the traditional concave-convex ring surface, makes the hardness distribution of the corrugated roller tooth part uniform, and significantly improves the wear resistance and service life of the corrugated roller. Meanwhile, uniform heating reduces heat treatment defects, improves the production qualification rate of the corrugated roller, and reduces the cost of rework. Moreover, it is not necessary to repeatedly adjust the heating parameters, which simplifies the operation process and improves the production efficiency of the heat treatment of the corrugated roller.

Description

Technical Field

[0001] This utility model relates to the field of induction heating coil technology, and in particular to an induction heating coil with good uniformity. Background Technology

[0002] Corrugated rolls are the core component in corrugated board production, and the precision of their surface tooth profile and the uniformity of their hardness directly determine the forming quality of the corrugated board. In the manufacturing of corrugated rolls, the surface heat treatment process requires induction heating to harden the teeth, and the rationality of the structure of the induction heating coil is crucial.

[0003] Existing induction heating coils used for heat treatment of corrugated rolls employ a concave-convex surface design. This structure cannot achieve a good fit with the tooth profile of the corrugated roll surface, resulting in inconsistent distances between the concave and convex parts of the heating coil and the tooth tips and roots of the corrugated roll: if the convex parts are too close to the tooth tips, the magnetic field coupling is too strong, causing localized overheating at the tooth tips; if the concave parts are too far from the tooth roots, the magnetic field strength is insufficient, leading to inadequate heating of the tooth roots. The irregularity of the concave-convex surface causes significant differences in the magnetic field distribution across different contact areas between the heating coil and the corrugated roll, making it impossible to form a uniform alternating magnetic field. This, in turn, leads to uneven eddy current distribution on the corrugated roll surface teeth, ultimately causing inconsistent tooth hardness, reducing the wear resistance and service life of the corrugated roll. Furthermore, the unstable heating quality increases the failure rate and rework costs of the corrugated roll heat treatment.

[0004] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an induction heating coil with good uniformity, which aims to solve the technical problem of uneven heating of corrugated rollers by the concave-convex induction heating coil in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A uniform induction heating coil includes a heating coil body and two electrode rods electrically connected thereto. The heating coil body is formed by two open-loop circular rings spaced apart. The two circular rings are electrically connected at their open loops and respectively electrically connected to the two electrode rods. The two circular rings are coaxially arranged and have the same diameter. The inner ring surfaces of the circular rings are located on the same circumference to ensure that the distance between the inner ring surface of the heating coil body and the workpiece surface is the same everywhere.

[0008] The aforementioned induction heating coil with good uniformity comprises two tubular rings that are electrically connected by a conductive metal plate, which seals the inner tube ends of the two rings.

[0009] The aforementioned induction heating coil with good uniformity has two electrode connecting rods that are both tubular structures, and the two electrode connecting rods are respectively connected to the ends of two circular bodies to serve as cooling water channels.

[0010] The uniform induction heating coil further includes two mounting brackets, which are fixedly connected to two electrode rods respectively. Each mounting bracket has a through hole, through which the inner tube of the electrode rod is connected to an external circulating water supply device.

[0011] The uniform induction heating coil further includes an insulating partition, which is disposed between two mounting brackets and extends to the opening of the two annular bodies.

[0012] The aforementioned induction heating coil with good uniformity has two outer rings connected to a circular tube, which is connected to the inner tube of the ring. The end of the circular tube is connected to a quick connector, which is used to connect to an external circulating water supply device.

[0013] The uniform induction heating coil further includes several insulating connectors, which are evenly distributed along the outer side of the heating coil body and are used to fix and connect the two rings.

[0014] The uniform induction heating coil has at least two mounting plates symmetrically arranged on the outer side of the heating coil body. Each mounting plate has a connecting groove for accommodating connecting screws.

[0015] Beneficial effects:

[0016] This invention provides an induction heating coil with good uniformity, comprising a heating coil body and two electrode rods electrically connected to it. The heating coil body consists of two coaxial rings with the same diameter. The inner ring surfaces of the rings are located on the same circumference to ensure that the distance between the inner ring surface of the heating coil body and the workpiece surface is the same everywhere. During surface heat treatment of the corrugated roller, the induction heating coil is suspended outside the corrugated roller, and the two electrode rods are respectively connected to the positive and negative terminals of the power supply, so that the heating coil body is energized. After energization, the two coaxial rings with the same diameter form a closed current loop. Because the inner ring surfaces are flush and the distance to the corrugated roller surface is consistent everywhere, the current is evenly distributed on the two rings, thereby generating a uniform alternating magnetic field. When the corrugated roller is placed in this uniform magnetic field, eddy currents of uniform density are induced at the tooth tips, tooth roots, and tooth surfaces. The Joule heating effect of the eddy currents achieves overall heating of the corrugated roller surface. This induction heating coil effectively avoids the problems of localized overheating or underheating caused by traditional concave-convex ring surfaces, resulting in uniform hardness distribution on the corrugated roll teeth and significantly improving its wear resistance and service life. At the same time, uniform heating reduces heat treatment defects, improves the production qualification rate of corrugated rolls, and reduces rework costs. Furthermore, it eliminates the need for repeated adjustments to heating parameters, simplifying the operation process and improving the production efficiency of corrugated roll heat treatment. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of the induction heating coil provided by this utility model;

[0018] Figure 2 A top view of the induction heating coil provided by this utility model;

[0019] Figure 3 Provided by this utility model Figure 2 A schematic diagram of the cross-sectional structure of AA in the middle section;

[0020] Figure 4 Provided by this utility model Figure 2 A schematic diagram of the cross-sectional structure of BB.

[0021] Figure label:

[0022] 1—Heating coil body; 2—Electrode connecting rod; 3—Mounting bracket

[0023] 4—Insulating partition; 5—Insulating connector; 6—Mounting plate

[0024] 11—Ring 12—Conductive metal plate 13—Circular tube

[0025] 14—Quick connector; 31—Through hole; 61—Connecting groove. Detailed Implementation

[0026] This utility model provides an induction heating coil with good uniformity. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0028] Please see Figures 1 to 4 As shown, this utility model provides an induction heating coil with good uniformity, including a heating coil body 1 and two electrode connecting rods 2 electrically connected thereto. The heating coil body 1 is formed by two open-loop circular rings 11 spaced apart. The two circular rings 11 are electrically connected at their open loops and respectively electrically connected to the two electrode connecting rods 2. The two circular rings 11 are coaxially arranged and have the same diameter. The inner ring surfaces of the circular rings 11 are located on the same circumference to ensure that the distance between the inner ring surface of the heating coil body 1 and the workpiece surface is the same everywhere.

[0029] During surface heat treatment of the corrugated roll, the induction heating coil is suspended outside the roll, and the two electrode rods 2 are connected to the positive and negative terminals of the power supply, energizing the heating coil body 1. After energization, two coaxial rings 11 with the same diameter form a closed current loop. Because the inner ring surfaces are flush and the distance to the corrugated roll surface is consistent throughout, the current is evenly distributed on the two rings 11, generating a uniform alternating magnetic field. When the corrugated roll is placed in this uniform magnetic field, eddy currents of uniform density are induced at the tooth tips, roots, and surfaces. The Joule heating effect of these eddy currents achieves overall heating of the corrugated roll surface. This induction heating coil effectively avoids the problems of localized overheating or underheating caused by traditional concave-convex ring surfaces, resulting in a uniform hardness distribution on the corrugated roll teeth, significantly improving its wear resistance and service life. Simultaneously, uniform heating reduces heat treatment defects, increases the production qualification rate of corrugated rolls, and reduces rework costs. Furthermore, it eliminates the need for repeated adjustments to heating parameters, simplifying the operation process and improving the production efficiency of corrugated roll heat treatment.

[0030] In this embodiment, both annular bodies 11 and two electrode connecting rods 2 are made of copper tubing. The inner diameter of the annular body 11 is larger than the outer diameter of the corrugated roller to be processed, and the opening angle of the annular body 11 does not exceed 10°. The opening points of the two annular bodies 11 are electrically connected by welding brass plates, and the two electrode connecting rods 2 are also fixed to both ends of the annular body 11 by welding. The connection method between the electrode connecting rods 2 and the power supply is existing technology and will not be described in detail here.

[0031] Please see Figures 1 to 3 As shown, both annular bodies 11 are tubular structures, electrically connected by a conductive metal plate 12, which also seals the inner tube ends of the two annular bodies 11. In this embodiment, the cross-section of the annular body 11 is a square tube, and the conductive metal plate 12 is a brass plate. Two annular bodies 11 are welded to both ends of the brass plate along its length, with the ends of the two annular bodies 11 connected to it located on opposite sides of the brass plate.

[0032] Please see Figure 4 As shown, both electrode connecting rods 2 are tubular structures, and are respectively connected to the ends of two annular bodies 11 to serve as cooling water channels. In this embodiment, the cross-section of the electrode connecting rods 2 is also a square tube, and the ends of the electrode connecting rods 2 and the annular bodies 11 are fixed by welding and are interconnected.

[0033] Please see Figures 1 to 2 As shown, it also includes two mounting brackets 3, which are fixedly connected to two electrode connecting rods 2 respectively. Each mounting bracket 3 has a through hole 31, through which the inner tube of the electrode connecting rod 2 is connected to the external circulating water supply equipment. In this embodiment, the mounting bracket 3 has an "L"-shaped structure. Its upper end is fixedly connected to the outer side of the electrode connecting rod 2 by welding, and its lower end has a through hole 31. The end of the electrode connecting rod 2 is welded to the periphery of the through hole 31. By installing the lower end of the mounting bracket 3 onto the mounting fixture on the outside of the circulating water supply equipment, the heating coil body 1 can be installed onto the outer wall of the circulating water supply equipment, saving on the layout of the cooling water circulation pipeline.

[0034] Please see Figures 1 to 2 As shown, it also includes an insulating partition 4, which is disposed between the two mounting brackets 3 and extends to the opening of the two annular bodies 11. In this embodiment, the insulating partition 4 is clamped between the two mounting brackets 3 and fixed by insulating screws to prevent short circuit faults from occurring between the two electrode connecting rods 2 through contact between the two mounting brackets 3.

[0035] Please see Figures 1 to 2As shown, each of the two annular bodies 11 has a circular pipe 13 connected to its outer side. The circular pipe 13 is connected to the inner pipe of the annular body 11, and the end of the circular pipe 13 is connected to a quick connector 14, which is used to connect to an external circulating water supply device. In this embodiment, since the connection between the two annular bodies 11 is blocked by the conductive metal plate 12, the cooling water cannot circulate between the two annular bodies 11. Therefore, a circular pipe 13 is set on the outer side of each annular body 11 to form a cooling water flow loop of "circulating water supply device - electrode connecting rod 2 - annular body 11 - circular pipe 13 - circulating water supply device" to cool the annular body 11 and prevent it from overheating and melting during heating. The heating coil body 1 adopts a dual water circulation design: one path enters water through the electrode connecting rod 2, flows through the inner pipe of the annular body, and returns water through the quick connector 14 of the circular pipe 13; the other path is symmetrically arranged to ensure uniform heat dissipation between the two annular bodies. The circular tube 13 is made of copper and is fixed to the outside of the circular ring 11 by welding. For ease of pipe installation, the circular tube 13 is positioned close to the electrode connecting rod 2 but does not contact it to avoid short circuits. The quick connector 14 can be a standard threaded quick connector 14 for easy and quick connection to the circulating water supply equipment.

[0036] Please see Figures 1 to 2 As shown, the device also includes several insulating connectors 5, which are evenly distributed along the outer side of the heating coil body 1 and are used to fix and connect the two annular bodies 11. To enhance the connection stability between the two annular bodies 11, the number of insulating connectors 5 is no less than three. In this embodiment, a total of five insulating connectors 5 are provided. One of them is located on one side of the opening of the annular body 11, symmetrical about the center point, forming a straight line through the center point and the opening of the annular body 11. The other four insulating connectors 5 are respectively arranged symmetrically on both sides about the straight line, with a certain distance between them. The insulating connectors 5 are polytetrafluoroethylene nuts with two screw holes. According to the distribution of the insulating connectors 5, matching bolts are welded to the outer sides of the two annular bodies 11. The connection and fixation of the two annular bodies 11 by the insulating connectors 5 are achieved through the cooperation of the bolts and screw holes.

[0037] Please see Figures 1 to 2 As shown, at least two mounting plates 6 are symmetrically arranged on the outer side of the heating coil body 1. Each mounting plate 6 has a connecting groove 61 for accommodating connecting screws. In this embodiment, there are four mounting plates 6, which are symmetrically welded to the outer side of the heating coil body 1 in pairs. The mounting plates 6 are placed on the clamping fixture of the external equipment and then locked in place by screws into the connecting grooves 61, ensuring that the heating coil body 1 can be stably clamped during operation, thus improving processing stability and safety.

[0038] In summary, this invention effectively avoids the problems of localized overheating or insufficient heating caused by traditional concave-convex ring surfaces, resulting in uniform hardness distribution in the corrugated roll teeth and significantly improving its wear resistance and service life. At the same time, uniform heating reduces heat treatment defects, improves the production qualification rate of corrugated rolls, and reduces rework costs. Furthermore, it eliminates the need for repeated adjustments to heating parameters, simplifies the operation process, and improves the production efficiency of corrugated roll heat treatment.

[0039] It is understood that those skilled in the art can make equivalent substitutions or modifications based on the technical solution and inventive concept of this utility model, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. An induction heating coil with good uniformity, comprising a heating coil body (1) and two electrode connecting rods (2) electrically connected thereto, characterized in that, The heating coil body (1) is formed by two open-ringed circular bodies (11) arranged at intervals. The two circular bodies (11) are electrically connected at their open rings and respectively electrically connected to two electrode connecting rods (2). The two circular bodies (11) are coaxially arranged and have the same diameter. The inner ring surfaces of the circular bodies (11) are located on the same circumference to ensure that the distance between the inner ring surface of the heating coil body (1) and the workpiece surface is the same everywhere.

2. The induction heating coil with good uniformity according to claim 1, characterized in that, Both rings (11) are tubular structures. The two rings (11) are electrically connected by a conductive metal plate (12), and the inner tube ends of the two rings (11) are sealed by the conductive metal plate (12).

3. The induction heating coil with good uniformity according to claim 2, characterized in that, Both electrode rods (2) are tubular structures, and the two electrode rods (2) are connected to the ends of the two rings (11) respectively to serve as cooling water channels.

4. The inductively heated coil of good uniformity according to claim 3, characterized in that, It also includes two mounting brackets (3), which are fixedly connected to two electrode rods (2) respectively. Each of the two mounting brackets (3) has a through hole (31), and the inner tube of the electrode rod (2) is connected to the external circulating water supply equipment through the through hole (31).

5. The induction heating coil with good uniformity according to claim 4, characterized in that, It also includes an insulating partition (4), which is disposed between the two mounting brackets (3) and extends to the opening of the two annular bodies (11).

6. The induction heating coil with good uniformity according to claim 2, characterized in that, Both annular bodies (11) are connected to a circular pipe (13) on their outer sides. The circular pipe (13) is connected to the inner pipe of the annular body (11). The end of the circular pipe (13) is connected to a quick connector (14). The quick connector (14) is used to connect to an external circulating water supply device.

7. The induction heating coil with good uniformity according to claim 1, characterized in that, It also includes several insulating connectors (5), which are evenly distributed along the outer side of the heating coil body (1) and are used to fix the two ring bodies (11).

8. The inductively heated coil of good uniformity according to claim 1, wherein, At least two mounting plates (6) are symmetrically arranged on the outer side of the heating coil body (1), and each of the at least two mounting plates (6) is provided with a connecting groove (61) for accommodating connecting screws.

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