Roller power supply scanning type induction heating device

Abstract

The invention discloses a roller power source scanning type induction heating device, and belongs to the field of roller quenching devices, the roller power source scanning type induction heating device comprises at least two layers of inductors which are stacked up and down, each layer of inductor comprises an external frame, a cylindrical copper pipe bare ring which is formed by a copper pipe spiral and is provided with an upper opening and a lower opening is fixedly arranged in the external frame, and the copper pipe bare ring is subjected to insulation treatment; the copper pipe bare ring is connected with an electricity leading connector, a plurality of I-shaped groove-shaped magnet yokes are uniformly and densely distributed outside the copper pipe bare ring in the circumferential direction, the copper pipe bare ring is clamped in the middle of the groove-shaped magnet yokes, and a cooling water path and a temperature measuring hole are formed in the copper pipe bare ring; and a water-cooling magnetic isolation ring is arranged between every two layers of sensors. The problems of cooling and magnetism isolation can be fully considered, and high-quality quenching heating of the roller is achieved.

Description

Technical Field

[0001] The invention relates to the field of roller quenching devices, in particular to a roller power scanning induction heating device. Background Art

[0002] The basic principle of power induction heating is to put the workpiece into the inductor (coil). When an alternating current of a certain frequency is passed through the inductor, an alternating magnetic field is generated around it. The electromagnetic induction of the alternating magnetic field generates a closed induced current - eddy current - in the workpiece. The distribution of the induced current on the cross section of the workpiece is very uneven. The current density on the surface of the workpiece is very high and gradually decreases inward. The electrical energy of the high-density current on the surface of the workpiece is converted into thermal energy, which increases the temperature of the surface, that is, surface heating is achieved. Induction heating itself has the characteristics of high efficiency and low metal burning. IGBT is used as the main device, with low switching loss, fast on-off speed, and high operating frequency, making the entire heating system more efficient.

[0003] Because of the advantages of induction heating, when quenching the rollers, it is necessary to consider introducing power induction heating, and it is necessary to design and manufacture a special scanning induction device to scan and heat the rollers to a predetermined temperature for quenching, so as to meet the surface hardness requirements. This device that uses power induction to heat the rollers, in addition to its own induction coil, also needs to fully consider the cooling and magnetic isolation of the induction device during the roller quenching process. Ordinary dual-frequency induction coils are just bare coils, and their heating stability and hardening uniformity are relatively poor. In addition, due to different production product requirements and different heating processes, when different frequencies and different positions need to be heated successively, conventional dual-frequency induction coils cannot be produced. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a roller power scanning induction heating device, which fully considers the cooling and magnetic isolation problems and realizes high-quality quenching heating of the roller.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a rolling roller power scanning induction heating device, including at least two layers of inductors stacked up and down, each layer of inductors includes an external frame, and a cylindrical copper tube bare ring composed of copper tube spirals and opened up and down is fixedly arranged in the external frame, the copper tube bare ring is insulated, and an electric lead-in connector is connected to the copper tube bare ring. A plurality of I-shaped slot-type yokes are evenly and densely distributed on the outside of the copper tube bare ring along the circumferential direction, the copper tube bare ring is clamped in the middle of the slot-type yoke, and a cooling water channel and a temperature measuring hole are arranged in the copper tube bare ring; a water-cooled magnetic isolation ring is arranged between each layer of inductors.

[0006] A further improvement of the technical solution of the present invention is that the inner diameter and height of the bare cylindrical copper tube in each layer of the inductor are consistent.

[0007] A further improvement of the technical solution of the present invention is that a temperature measuring hole with a size of not less than 20*10mm is arranged in the middle and lower outer sides of the bare copper tube ring, and an electric lead joint is connected to the outer side of the bare copper tube ring, and the positions of the electric lead joint and the temperature measuring hole are relatively spaced 180° apart.

[0008] A further improvement of the technical solution of the present invention is that the insulation treatment of the bare copper tube is specifically that the overall outer surface of the copper tube is double-wrapped with mica tape and heat shrink tape, high-temperature pressed mica plates are filled between each turn of the bare copper tube, and the whole is dipped in paint and dried, and the inner lining of the cylindrical bare copper tube is provided with refractory cement.

[0009] A further improvement of the technical solution of the present invention is that the refractory cement has a single-side thickness of 20 mm, which can meet the heat insulation effect when the maximum temperature of the rolling roller is 1200 degrees.

[0010] A further improvement of the technical solution of the present invention is that the interior of the bare copper tube is segmented and blocked with two turns of copper coils as the minimum unit, and a cooling water path is set on every two turns of copper coils after blocking. The cooling water path is specifically as follows: the water inlet pipe is connected to the starting point of the first turn of the two turns of copper coils, and the return water pipe is connected to the end point of the second turn of copper coils. The return water pipe is provided with a temperature sensor and a flow switch.

[0011] The further improvement of the technical solution of the present invention is that the yoke material is made of epoxy board and mica board, the magnetic permeability is 1.5T, and the contact surface between the yoke and the outer wall of the bare copper tube ring maintains a consistent curvature.

[0012] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: by setting the inductor to be open at the top and bottom, it is more convenient to hoist and operate the large-sized rollers during quenching. By blocking the inside of the bare copper tube and dividing it into multiple cooling water channels, the inductor can be cooled more efficiently, and the cooling conditions of each water channel can be detected more carefully, ensuring the long-term stable operation of the induction heating device. By setting a number of magnetic yokes on the outside of the bare copper tube, the magnetic field can be well isolated in combination with the insulation treatment to ensure the heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a schematic front view of the roller power scanning induction heating device of the present invention;

[0015] Figure 2It is a top view schematic diagram of the roller power scanning induction heating device of the present invention.

[0016] Among them, 1. sensor, 2. external frame, 3. bare copper tube ring, 4. magnetic yoke, 5. cooling water channel, 6. temperature measuring hole, 7. water-cooled magnetic isolation ring. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with embodiments:

[0018] like Figure 1 Figure 2The figure shows a schematic diagram of the structure of a roller power scanning induction heating device, which is provided with at least two layers of inductors stacked up and down. In this embodiment, there are two layers, and the upper and lower layers can be heated successively. Each layer of inductors 1 includes an external frame 2. The main body of the external frame is cylindrical and is also provided with hanging ears. The frame is provided with through holes in the axial direction. The inductors of each layer are aligned by the through holes on the external frame and fixed by inserting bolts. The internal part of the external frame is fixed with a copper tube spiral composed of upper and lower open cylindrical copper tube bare rings 3. The inner diameter, rotation direction and height of the cylindrical copper tube bare ring 3 in each layer of inductors 1 are consistent, but the number of turns is not fixed. When the number of turns is different, the height is made the same by controlling the pitch. In this embodiment, the inner diameter of the bare copper tube in the upper sensor is 980mm, with a total of 8 turns and a pitch of 20.25mm. The inner diameter of the bare copper tube in the lower sensor is 980mm, with a total of 4 turns and a pitch of 32.5mm. By adjusting the pitch, the bare copper tubes of the upper and lower layers have different numbers of turns, but the height of the cylindrical bare copper tube is the same. The pitch error of the sensor is less than 1mm, and the radial error is ±2mm. The environmental noise is less than 80db at maximum load. The gap between the upper and lower sensors is not more than 150mm. The bare copper tubes 3 in the two layers of sensors 1 are insulated, specifically, the outer surface of the copper tube is double-layered with mica tape and heat shrink tape, and the copper tubes of each turn of the bare copper tube 3 are filled with high-temperature pressed mica plates and the whole is dipped in paint and dried. The insulation strength and temperature resistance level are high, and the combination with the copper tube coil is firm, and the insulation performance is good. The inner lining of the cylindrical copper tube bare ring 3 is made of refractory cement, with a single-side thickness of 20mm, which meets the heat insulation effect when the maximum temperature of the roller is 1200 degrees, and ensures that the refractory layer is not easy to fall off. The outside of the copper tube bare ring 3 is evenly and densely distributed with a number of groove-shaped yokes 4 along the circumferential direction, and the copper tube bare ring 3 is clamped in the middle of the groove-shaped yoke 4. Because the height and inner diameter of the copper tube bare ring 3 are consistent, the specifications of the yokes 4 used are also consistent, that is, the same yokes 4 are used to clamp 8 turns of copper rings and 4 turns of copper rings respectively. In this embodiment, 55-60 yokes 4 are evenly distributed along the circumferential direction on the outside of the copper tube bare ring 3 of each sensor, the yoke 4 is 50mm wide, the cross-section is 50*30mm, and the thickness of the silicon steel sheet is 0.3mm. The contact surface of the yoke yoke 4 and the outer wall of the copper tube bare ring 3 maintains a consistent curvature and is as dense as possible without leaving gaps, except for the necessary gaps left for the temperature measuring holes and the inlet and outlet. The yoke 4 is made of epoxy board and mica board, and the magnetic permeability is 1.5 T. A water-cooled magnetic isolation ring 7 is arranged between the upper and lower inductors.

[0019] On the outer surface of the bare copper tube 3, a temperature measuring hole 6 with a size not less than 20*10mm is set at the upper, middle and lower positions. The temperature measuring holes at the upper / lower positions are set between the external frame and the first / last layer of copper tubes, and the temperature measuring hole at the middle position is set between the gaps of the staggered yokes. An electric lead connector is connected to the outer surface of the bare copper tube 3. The electric lead connector and the temperature measuring hole 6 are at opposite heights and 180° apart, leaving space for the installation of a thermometer.

[0020] A cooling water path 5 is set in the bare copper tube ring 3 in each sensor 1, specifically, the inside of the copper tube is segmented and blocked with two turns of copper rings as the minimum unit. Specifically, copper sheets can be selected to weld and seal the copper tube radially. A cooling water path 5 is set on every two turns of copper rings after blocking. The cooling water path is specifically as follows: a water inlet is opened at the starting point of the first turn of the two turns of copper rings, which is used to connect the water inlet pipe. Cold water is continuously input into the water inlet pipe for cooling the copper tube. A return water port is set at the end of the second turn of the copper ring, which is used to connect the return water pipe. The return water pipe is provided with a temperature sensor and a flow switch to monitor the return water temperature at all times, which is used to monitor the cooling condition in the copper ring. The return water volume is controlled by the flow switch to adjust the cooling condition. By measuring the outlet water temperature and outlet water flow of each path, the normal use of the sensing device is ensured. In this embodiment, 4 cooling water paths are connected to the upper sensor, and 2 cooling water paths are connected to the lower sensor, for a total of six cooling water paths. The present invention can use IGBT power supply to induction heat the roller. Because of sufficient insulation treatment, cooling treatment and heat insulation treatment, it is not only very stable in use performance, but also the heating stability and hardening uniformity of the produced roller are stronger than those of ordinary induction coils, which greatly guarantees the performance of the produced roller. By setting up a multi-layer inductor, different layers of inductors can be heated at different times according to the process requirements of the product to meet different production requirements.

[0021] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A roller power scanning induction heating device, characterized in that: The invention comprises at least two layers of sensors stacked up and down, each layer of sensors (1) comprises an external frame (2), a cylindrical copper tube bare ring (3) composed of copper tube spirals and opened up and down is fixedly arranged inside the external frame (2), the copper tube bare ring is insulated, an electric lead joint is connected to the copper tube bare ring, a plurality of I-shaped slot-shaped magnetic yokes (4) are evenly and densely distributed on the outside of the copper tube bare ring along the circumferential direction, the copper tube bare ring (3) is clamped in the middle of the slot-shaped magnetic yoke (4), and a cooling water channel (5) and a temperature measuring hole (6) are arranged in the copper tube bare ring (3); and a water-cooling magnetic isolation ring (7) is arranged between each layer of sensors (1).

2. A roller power scanning induction heating device according to claim 1, characterized in that: The inner diameter and height of the cylindrical copper tube bare ring (3) in each layer of the inductor (1) are consistent.

3. The roller power scanning induction heating device according to claim 1, characterized in that: A temperature measuring hole (6) with a size not less than 20*10 mm is arranged in the middle and lower of the outer side surface of the copper tube bare ring (3), and an electric lead joint is connected to the outer side surface of the copper tube bare ring (3), and the positions of the electric lead joint and the temperature measuring hole (6) are relatively spaced 180 degrees apart.

4. The roller power scanning induction heating device according to claim 1, characterized in that: The insulation treatment of the bare copper tube (3) is specifically as follows: the outer surface of the copper tube is double-wrapped with mica tape and heat shrink tape; high-temperature pressed mica plates are filled between each turn of the copper tube of the bare copper tube (3) and the whole is dipped in varnish and dried; and the inner lining of the cylindrical bare copper tube (3) is provided with refractory cement.

5. The roller power scanning induction heating device according to claim 4, characterized in that: Refractory cement, with a single-side thickness of 20 mm, can provide the heat insulation effect when the maximum roller temperature is 1200 degrees.

6. The roller power scanning induction heating device according to claim 1, characterized in that: The inside of the copper tube of the bare copper tube (3) is segmented and blocked with two turns of copper coils as the minimum unit, and a cooling water path is set on every two turns of copper coils after blocking. The cooling water path is specifically as follows: an inlet pipe is connected to the starting point of the first turn of the two turns of copper coils, and a return pipe is connected to the end point of the second turn of the copper coil. A temperature sensor and a flow switch are set on the return pipe.

7. The roller power scanning induction heating device according to claim 2, characterized in that: The yoke (4) is made of epoxy board and mica board, and has a magnetic permeability of 1.5T. The contact surface between the yoke (4) and the outer wall of the copper tube bare ring (3) maintains a consistent curvature.

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