Eddy current type annealing furnace device for enameled wire and annealing method thereof

Abstract

The enameled wire eddy current type annealing furnace device comprises a main support and an annealing box arranged on the main support, the interior of the annealing box is sequentially divided into a heating cavity, a heat preservation cavity and a cooling cavity through a plurality of partition plates from the feeding end to the discharging end, a plurality of sets of material passing holes are formed in the partition plates, and the two sides of the heating cavity and the two sides of the heat preservation cavity are sealed through the partition plates; the feeding end of the cooling cavity is closed through a partition plate, the discharging end of the cooling cavity is open, the feeding end of the main support is provided with a tensioning feeding structure, the discharging end of the main support is provided with a first guide wheel set, a heating cavity and a heat preservation cavity section of the annealing box are each provided with a protective gas filling structure, an eddy current heating structure is arranged in the heating cavity, and an air cooling structure is arranged at the bottom of the cooling cavity. Comprising. By adopting the structure, the heat conversion efficiency is high, the heating speed is high, and the production efficiency is remarkably improved; the oxidation risk and environmental pollution are reduced, the heat efficiency is high, the heating time is short, and the energy consumption is low; the method is suitable for large-scale continuous operation and reduces manual intervention.

Description

Technical Field

[0001] The invention belongs to the technical field of enameled wire production and processing equipment, and in particular relates to an enameled wire eddy current annealing furnace device and an annealing method thereof. Background Art

[0002] The existing enameled wire production process has to go through multiple processing steps, and the annealing process is a key link in determining the quality of the enameled wire. When the enameled wire passes through the annealing furnace tube, it is easy for the traditional annealing furnace tube to have uneven temperature. Whether it is when heating to the annealing temperature or when keeping a constant temperature during the insulation stage to allow the crystal lattice inside the metal to fully rearrange and eliminate internal stress, it will be affected by the uneven temperature, causing quality problems in the baking process of the enameled wire product. At the same time, when passing through the annealing furnace, it is not only easy to damage the surface paint, but also easy to cause damage to the wire during subsequent processing and winding. Therefore, it is urgent to design an enameled wire eddy current annealing furnace device with optimized structure and reliable performance to solve the above technical problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an enameled wire eddy current annealing furnace device and an annealing method thereof.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an enameled wire eddy current annealing furnace device, comprising a main support and an annealing box arranged thereon, the interior of the annealing box is separated into a heating chamber, an insulation chamber and a cooling chamber in sequence from the feed end to the discharge end by multiple partitions, and multiple groups of feeding holes are provided on the partitions. Both sides of the heating chamber and the insulation chamber are closed by partitions, the feed end of the cooling chamber is closed by partitions, and the discharge end of the cooling chamber is open. The feed end of the main support is provided with a tensioning feeding structure, and the discharge end of the main support is provided with a first guide wheel group. The heating chamber and the insulation chamber sections of the annealing box are provided with a protective gas filling structure, the heating chamber is provided with an eddy current heating structure, and the bottom of the cooling chamber is provided with an air cooling structure. In a preferred solution, the protective gas filling structure includes an inert gas generating device, and the inert gas generating device is connected to the heating chamber and the heat preservation chamber of the annealing box through a circulation pipeline.

[0005] In a preferred solution, temperature sensors are symmetrically provided at the positions of the heat preservation chambers on the annealing box.

[0006] In the preferred embodiment, the tensioning feeding structure includes a second guide wheel group symmetrically arranged on the main bracket, an electric push rod is symmetrically arranged in the middle position between the symmetrically arranged second guide wheel groups, a lifting frame is provided at the output end of the electric push rod, and a tensioning wheel group is provided at the bottom of the lifting frame.

[0007] In a preferred solution, a mounting plate is provided on the partition at the feed end of the annealing box, and a plurality of positioning coils cooperating with the feed holes are provided on the mounting plate.

[0008] In a preferred solution, the eddy current heating structure includes a control seat arranged on the inner wall of the heating chamber in the annealing box, and an eddy current induction coil is provided on the control seat.

[0009] In a preferred embodiment, the heat preservation chamber is provided with a plurality of groups of heating elements symmetrically arranged on the inner wall of the heat preservation chamber.

[0010] In a preferred embodiment, the air cooling structure includes multiple groups of mounting frames arranged at the bottom of the cooling chamber in the annealing box, a fan structure is provided in the mounting frame, a first filter screen is provided at the bottom of the mounting frame, and a second filter screen is provided at the bottom of the cooling chamber to cooperate with the top of the air cooling structure.

[0011] In a preferred solution, a guide ramp is provided on the top of the cooling chamber in the annealing box.

[0012] The present invention can achieve the following beneficial effects: (1) The principle of electromagnetic induction is used to generate eddy currents inside the enameled wire to generate heat by itself, without the need for external heat transfer medium. The heat conversion efficiency is high, the heating speed is fast, and the production efficiency is significantly improved. (2) The high-frequency magnetic field can accurately act on the enameled wire conductor, concentrating the energy inside the metal and reducing heat loss; (3) By adjusting the power, frequency and other parameters of the high-frequency power supply, the annealing temperature can be quickly and accurately controlled with a small error range, usually within ±5°C, to meet the annealing requirements of enameled wires of different materials and specifications; (4) The enameled wire does not need to be in direct contact with the heating element, thus avoiding mechanical wear or contamination. It is especially suitable for annealing fine-diameter enameled wire to ensure the integrity of the surface insulation layer. It can be linked with enameled wire drawing, painting and other processes to form an automated production line, which is suitable for large-scale continuous operations and reduces manual intervention. (5) Compared with traditional flame or resistance furnace annealing, eddy current heating does not emit combustion exhaust gas, and the protective gas can be recycled, reducing the risk of oxidation and environmental pollution. It has high thermal efficiency, short heating time and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and examples: Fig. 1 It is a schematic diagram of the overall structure of the device of the present invention; Fig. 2 It is a schematic diagram of the overall structure of the device of the present invention; Fig. 3 Schematic diagram of the internal annealing structure of the present invention; Fig. 4 This is a schematic diagram of the tension feeding structure of the present invention; Fig. 5 This is a schematic diagram of the high temperature section structure of the present invention; Fig. 6 It is a schematic structural diagram of the cooling section of the present invention.

[0014] In the figure: main bracket 1, annealing box 2, temperature sensor 3, tensioning feeding structure 4, first guide wheel group 5, inert gas generating device 6, circulation pipeline 7, second guide wheel group 8, electric push rod 9, lifting frame 10, tensioning wheel group 11, partition 12, feeding hole 13, mounting plate 14, positioning coil 15, control seat 16, eddy current induction coil 17, heating element 18, mounting frame 19, fan structure 20, first filter screen cover 21, second filter screen cover 22, guide ramp 23. DETAILED DESCRIPTION

[0015] Example 1: like Figs. 1-6 In the embodiment, the enameled wire eddy current annealing furnace device includes a main support 1 and an annealing box 2 arranged thereon. The interior of the annealing box 1 is separated into a heating chamber, an insulation chamber and a cooling chamber in sequence from the feed end to the discharge end by multiple partitions 12. The partitions 12 are provided with multiple groups of feeding holes 13. Both sides of the heating chamber and the insulation chamber are closed by partitions 12. The feed end of the cooling chamber is closed by partitions 12, and the discharge end of the cooling chamber is open. The feed end of the main support 1 is provided with a tensioning feeding structure 4, and the discharge end of the main support 1 is provided with a first guide wheel group 5. The heating chamber and the insulation chamber sections of the annealing box 2 are provided with a protective gas filling structure, the heating chamber is provided with an eddy current heating structure, and the bottom of the cooling chamber is provided with an air cooling structure. In a preferred solution, the protective gas filling structure includes an inert gas generating device 6 , which is connected to the heating chamber and the heat preservation chamber of the annealing box 2 through a circulation pipeline 7 .

[0016] In a preferred solution, temperature sensors 3 are symmetrically provided at the positions of the heat preservation chambers on the annealing box 2 .

[0017] In the preferred embodiment, the tensioning feeding structure 4 includes a second guide wheel group 8 symmetrically arranged on the main bracket 1, an electric push rod 9 is symmetrically arranged in the middle position between the symmetrically arranged second guide wheel groups 8, a lifting frame 10 is provided at the output end of the electric push rod 9, and a tensioning wheel group 11 is provided at the bottom of the lifting frame 10.

[0018] In a preferred solution, a mounting plate 14 is provided on the partition 12 at the feed end of the annealing box 2 , and a plurality of positioning coils 15 cooperating with the feed holes 13 are provided on the mounting plate 14 .

[0019] In a preferred solution, the eddy current heating structure includes a control seat 16 arranged on the inner wall of the heating chamber in the annealing box 1 , and an eddy current induction coil 17 is provided on the control seat 16 .

[0020] In a preferred embodiment, the heat preservation chamber is provided with a plurality of groups of heating elements 18 symmetrically arranged on the inner wall of the heat preservation chamber.

[0021] In a preferred embodiment, the air-cooling structure includes multiple mounting frames 19 arranged at the bottom of the cooling chamber in the annealing box 1, a fan structure 20 is provided in the mounting frame 19, a first filter screen cover 21 is provided at the bottom of the mounting frame 19, and a second filter screen cover 22 is provided at the bottom of the cooling chamber to cooperate with the top of the air-cooling structure.

[0022] In a preferred solution, a guide ramp 23 is provided on the top of the cooling chamber in the annealing box 1 .

[0023] Example 2: like Figs. 1-6 In the process, preparation is performed in advance: the stretched enameled wire is mounted on the pay-off device, the electric push rod 9 is started, and the height of the lifting frame 10 is adjusted to drive the tensioning wheel group 11 to move up and down, thereby adjusting the tension of the enameled wire and ensuring that the enameled wire is evenly and stably fed into the annealing box 2 through the second guide wheel group 8 for processing; Enameled wire positioning and transmission: The enameled wire is precisely positioned by the positioning coil 15 and passes through the heating chamber, insulation chamber and cooling chamber in sequence from the feeding end along the path of the feeding hole 13; Heating Process: When the enameled wire enters the heating chamber, the eddy current induction coil 17 generates a high-frequency alternating magnetic field, creating eddy currents within the wire, causing it to heat up rapidly. The appropriate annealing temperature is set based on the wire's material: for copper wire, the temperature is set between 400-700°C; for aluminum wire, the temperature is set between approximately 300-400°C. Simultaneously, the inert gas generator 6 feeds inert gas into the heating chamber via the circulation line 7, isolating the wire from oxygen and preventing oxidation. Insulation process: The heated enameled wire enters the insulation chamber, where the temperature sensor 3 monitors the temperature in the chamber in real time and feeds the data back to the control system. When the temperature is lower than the set value, the control system activates the heating element 18 for heating; when the temperature is higher than the set value, the heating element 18 stops working, thereby maintaining a constant temperature in the insulation chamber. The appropriate insulation time is set based on factors such as the diameter and material of the enameled wire to fully rearrange the metal's internal lattice and eliminate internal stress. Cooling Process: After the insulation is complete, the enameled wire enters the cooling chamber. The fan mechanism 20 activates, drawing air through the first filter screen 21. Air then passes through the mounting frame 19 and is blown toward the enameled wire, cooling it. The cooled air is then discharged through the second filter screen 22. The guide ramp 23 evenly distributes the airflow, ensuring controlled cooling of the wire and solidifying the metal structure, completing the annealing process. The cooled wire is then discharged through the first guide wheel assembly 5 and enters the subsequent production process.

[0024] Example 3: like Figs. 1-6 In the present invention, the annealing method is specifically as follows: Step 1: Pre-prepare, install the stretched enameled wire on the wire pay-off equipment, adjust the tension by tensioning the feeding structure 4, and ensure that the enameled wire is evenly and stably fed into the annealing box 2 for processing; Step 2: The enameled wire is positioned by the positioning coil 15 and passes through the heating chamber, the heat preservation chamber and the cooling chamber in sequence from the feed hole 13 at the feed end; Step 3: In the heating chamber, the enameled wire passes through the eddy current induction coil 17. The high-frequency alternating magnetic field generates eddy currents in the enameled wire, causing it to heat up rapidly. The annealing temperature varies depending on the material and specifications of the enameled wire. Copper conductors are usually heated to 400-700°C, and aluminum conductors are about 300-400°C. At the same time, the heating chamber is filled with inert gas input by the inert gas generator 6 to isolate the oxidizing effects of oxygen; Step 4: After heating, the enameled wire enters the insulation chamber. Under the combined action of the temperature sensor 3 and the heating element 18, a constant temperature is maintained, allowing the metal's internal lattice to fully rearrange and eliminate internal stress. The insulation time needs to be adjusted according to factors such as the diameter and material of the enameled wire. Step 5: After the insulation is completed, the enameled wire enters the cooling chamber and is controlled and cooled by the air cooling structure to fix the metal structure and complete the annealing process.

[0025] The beneficial effects of the present invention are as follows: the principle of electromagnetic induction is used to generate eddy currents inside the enameled wire to generate self-heating, without the need for an external heat transfer medium, with high heat conversion efficiency, fast heating speed, and significantly improved production efficiency; the high-frequency magnetic field can accurately act on the enameled wire conductor, and the energy is concentrated inside the metal, reducing heat loss; by adjusting the power, frequency and other parameters of the high-frequency power supply, the annealing temperature can be quickly and accurately controlled, with a small error range, usually within ±5°C, to meet the annealing needs of enameled wires of different materials and specifications; the enameled wire does not need to be in direct contact with the heating element, avoiding mechanical wear or pollution, and is particularly suitable for annealing fine-diameter enameled wires to ensure that the surface insulation layer is intact. It can be linked with enameled wire drawing, painting and other processes to form an automated production line, which is suitable for large-scale continuous operations and reduces manual intervention; compared with traditional flame or resistance furnace annealing, eddy current heating has no combustion exhaust emissions, and the protective gas can be recycled, reducing the risk of oxidation and environmental pollution, and has high thermal efficiency, short heating time and low energy consumption.

Claims

1. An enameled wire eddy current annealing furnace device, comprising a main support (1) and an annealing box (2) arranged thereon, characterized in that: The interior of the annealing box (1) is separated into a heating chamber, a heat preservation chamber and a cooling chamber in sequence from the feed end to the discharge end by a plurality of partitions (12), a plurality of groups of feed holes (13) are provided on the partitions (12), both sides of the heating chamber and the heat preservation chamber are closed by the partitions (12), the feed end of the cooling chamber is closed by the partitions (12), and the discharge end of the cooling chamber is open, the feed end of the main bracket (1) is provided with a tensioning feed structure (4), the discharge end of the main bracket (1) is provided with a first guide wheel group (5), the heating chamber and the heat preservation chamber section of the annealing box (2) are provided with a protective gas filling structure, an eddy current heating structure is provided in the heating chamber, and an air cooling structure is provided at the bottom of the cooling chamber.

2. The enameled wire eddy current annealing furnace device according to claim 1, characterized in that: The protective gas filling structure comprises an inert gas generating device (6), and the inert gas generating device (6) is connected to the heating chamber and the heat preservation chamber of the annealing box (2) through a circulation pipeline (7).

3. The enameled wire eddy current annealing furnace device according to claim 1, characterized in that: Temperature sensors (3) are symmetrically provided at the positions of the heat preservation chambers on the annealing box (2).

4. The enameled wire eddy current annealing furnace device according to claim 1, characterized in that: The tensioning feeding structure (4) comprises a second guide wheel group (8) symmetrically arranged on the main bracket (1), an electric push rod (9) symmetrically arranged at the middle position between the symmetrically arranged second guide wheel groups (8), a lifting frame (10) is provided at the output end of the electric push rod (9), and a tensioning wheel group (11) is provided at the bottom of the lifting frame (10).

5. The enameled wire eddy current annealing furnace device according to claim 1, characterized in that: A mounting plate (14) is provided on the partition (12) at the feed end of the annealing box (2), and a plurality of positioning coils (15) cooperating with the feed holes (13) are provided on the mounting plate (14).

6. The eddy current annealing furnace device for enameled wire according to claim 1, characterized in that: The eddy current heating structure comprises a control seat (16) arranged on the inner wall of the heating chamber in the annealing box (1), and an eddy current induction coil (17) is provided on the control seat (16).

7. The enameled wire eddy current annealing furnace device according to claim 1, characterized in that: The heat preservation cavity is provided with a plurality of groups of heating elements (18) symmetrically arranged on the inner wall of the heat preservation cavity.

8. The enameled wire eddy current annealing furnace device according to claim 1, characterized in that: The air cooling structure comprises a plurality of mounting frames (19) arranged at the bottom of a cooling chamber in an annealing box (1), a fan structure (20) being arranged in the mounting frame (19), a first filter screen (21) being arranged at the bottom of the mounting frame (19), and a second filter screen (22) being arranged at the bottom of the cooling chamber and cooperating with the top of the air cooling structure.

9. The enameled wire eddy current annealing furnace device according to claim 1, characterized in that: A guide ramp (23) is provided on the top of the cooling cavity in the annealing box (1).

10. The annealing method of the enameled wire eddy current annealing furnace device according to any one of claims 1 to 9, characterized in that The following steps are involved: Step 1: Pre-prepare, install the stretched enameled wire on the wire pay-off device, adjust the tension by tensioning the feed structure (4), and ensure that the enameled wire is evenly and stably fed into the annealing box (2) for processing; Step 2: The enameled wire is positioned by the positioning coil (15) and passes through the heating chamber, the heat preservation chamber and the cooling chamber in sequence from the feeding hole (13) at the feeding end; Step 3: In the heating chamber, the enameled wire passes through the eddy current induction coil (17). The high-frequency alternating magnetic field generates eddy currents in the enameled wire, causing it to heat up rapidly. The annealing temperature varies depending on the material and specifications of the enameled wire. Copper conductors are usually heated to 400-700°C, and aluminum conductors are about 300-400°C. At the same time, the heating chamber is filled with inert gas input by the inert gas generator (6) to isolate the oxidizing effect of oxygen. Step 4: After heating, the enameled wire enters the insulation chamber. Under the combined action of the temperature sensor (3) and the heating element (18), a constant temperature is maintained to allow the metal's internal lattice to fully rearrange and eliminate internal stress. The insulation time needs to be adjusted according to factors such as the diameter and material of the enameled wire. Step 5: After the insulation is completed, the enameled wire enters the cooling chamber and is controlled and cooled by the air cooling structure to fix the metal structure and complete the annealing process.

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