Medium-frequency induction heating furnace

Abstract

The medium-frequency induction heating furnace comprises a heating device, a control device and an adjusting device, the heating device comprises a control cabinet and a machine frame arranged on one side of the control cabinet, a furnace body is arranged on the machine frame, an induction coil is arranged in the furnace body, the induction coil is electrically connected with the control cabinet, and the adjusting device is electrically connected with the control cabinet. A material channel is arranged in the furnace body; the control device comprises a closed magnetic ring arranged in the material channel; the utility model has the beneficial effects that under the action of the adjusting device, the closed magnetic ring is adjusted to the opening of the furnace body, so that the closed magnetic ring is positioned at the end part of a product, and the closed magnetic ring plays a role in weakening a magnetic field, so that the magnetic force in the furnace body is more uniform, the product quality is improved, and the product quality is improved. Therefore, products in the furnace body are heated more uniformly, and the production quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of induction heating furnace production, in particular to a medium frequency induction heating furnace. Background Art

[0002] Induction heating furnace is a power supply device that converts 50HZ AC power into medium frequency (300HZ to 1000HZ), converts three-phase AC power into DC power after rectification, and then converts DC power into adjustable medium frequency current, which is supplied to the medium frequency alternating current flowing through the capacitor and induction coil, generates high-density magnetic lines in the induction coil, cuts the metal material in the induction coil, and generates large eddy current in the metal material. It has the characteristics of fast heating speed and less oxidation.

[0003] In the related art, a medium frequency induction heating furnace body is proposed, including a furnace lining, a material channel for the billet to pass through is opened in the middle of the furnace lining, an induction coil is arranged in the furnace lining and extends axially along the material channel and is spirally wound on the outside of the material channel; a plurality of temperature measuring holes are arranged at intervals along the axial direction of the furnace lining on the side wall of the furnace lining, wherein the temperature measuring holes are arranged radially along the furnace lining and penetrate the side wall of the furnace lining, and the temperature measuring holes are located at the interval between two adjacent turns of the induction coil.

[0004] With regard to the above-mentioned related technologies, the following defects exist: after the induction coil is energized, magnetic lines of force are generated in the induction coil. As is known to all, the density of magnetic lines of force at the ends of the induction coil is greater than that in the middle. After the metal material is placed in the furnace lining, this causes the end of the metal material close to the opening of the furnace lining to heat faster, while the part located in the furnace lining heats slower, resulting in uneven heating of the metal material as a whole, affecting production quality. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical deficiencies, to provide a medium frequency induction heating furnace, and to solve the technical problem of uneven magnetic force distribution in the furnace body in the prior art.

[0006] In order to achieve the above technical purpose, the technical solution of the utility model provides a medium frequency induction heating furnace, including a heating device, the heating device includes a control cabinet and a frame arranged on one side of the control cabinet, a furnace body is arranged on the frame, an induction coil is arranged in the furnace body, the induction coil is electrically connected to the control cabinet, and a material channel is arranged in the furnace body;

[0007] A control device, the control device comprising a closed magnetic loop disposed in the material channel; and

[0008] The adjusting device is arranged on the furnace body and is used to adjust the position of the closed magnetic ring.

[0009] In some embodiments, the adjusting device includes a lifting mechanism and a supporting mechanism disposed on the furnace body, the lifting mechanism is used to lift the closed magnetic ring, and the supporting mechanism is used to support the closed magnetic ring.

[0010] In some embodiments, the lifting mechanism includes a first leg arranged on both sides of a closed magnetic ring, the two first legs extend outside the furnace body, a second leg is arranged on the end of the first leg away from the closed magnetic ring, a third leg is arranged on the second leg, two hoses are arranged on the frame, the ends of the two hoses away from the frame are respectively mounted on the two third legs, and a fixing assembly for fixing the hoses is arranged on the third leg.

[0011] In some embodiments, the fixing assembly includes a clamp mounted on the hose, and the clamp is used to press the hose onto the third leg.

[0012] In some embodiments, the supporting mechanism includes two pads disposed at the ends of the furnace body, and the two second legs are respectively abutted against the two pads.

[0013] In some embodiments, an extending direction of the second leg is the same as an extending direction of the pad.

[0014] In some embodiments, the two spacers are located at the bottom of the furnace body.

[0015] In some embodiments, support rods are provided on both sides of the end of the furnace body, and the two cushion blocks are slidably connected to the two support rods respectively. The support rods are provided with locking components for locking the cushion blocks.

[0016] In some embodiments, the locking assembly includes two nuts disposed on the support rod, and the two nuts are respectively pressed against two ends of the spacer.

[0017] In some embodiments, a gasket is provided on the support rod between the gasket and the nut.

[0018] Compared with the prior art, the beneficial effects of the utility model include: under the action of the adjusting device, the closed magnetic ring is adjusted to the opening of the furnace body, so that the closed magnetic ring is located at the end of the product, and the closed magnetic ring weakens the magnetic field, thereby making the magnetic force in the furnace body more uniform, so that the products in the furnace body are heated more evenly, thereby improving the production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the heating furnace provided by the utility model;

[0020] Figure 2 It is a schematic diagram of the overall structure of the furnace body provided by the utility model;

[0021] Figure 3It is a schematic diagram of the overall structure of the support mechanism provided by the utility model.

[0022] Description of reference numerals:

[0023] 1-heating device, 11-control cabinet, 12-frame, 13-furnace body, 14-material channel, 2-control device, 21-closed magnetic ring, 3-adjusting device, 31-lifting mechanism, 311-first support leg, 312-second support leg, 313-third support leg, 314-hose, 315-fixing assembly, 316-hoop, 32-support mechanism, 321-pad, 322-support rod, 323-locking assembly, 324-nut, 325-gasket. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] The utility model provides a medium frequency induction heating furnace, the structure of which is as follows Figure 1 - Figure 3 As shown, it includes a heating device 1, a control device 2 and an adjusting device 3.

[0026] The heating device 1 includes a control cabinet 11 and a frame 12 fixedly connected to one side of the control cabinet 11, a furnace body 13 is installed on the frame 12, an induction coil is installed inside the furnace body 13, the induction coil is electrically connected to the control cabinet 11, and a material channel 14 is coaxially opened in the furnace body 13.

[0027] The control device 2 includes a closed magnetic ring 21 disposed in the material channel 14. The closed magnetic ring 21 is made of steel. Steel is an excellent material for blocking magnetic fields because it contains a large amount of iron, which can greatly reduce the penetration of magnetic fields.

[0028] The adjusting device 3 is disposed on the furnace body 13 , and the adjusting device 3 is used to adjust the position of the closed magnetic ring 21 .

[0029] When in use, the heating uniformity of the furnace body 13 is tested, a test piece is placed in the furnace body 13, the induction coil is energized through the control cabinet 11, the test piece is heated, and the position of the closed magnetic ring 21 is adjusted using the adjustment device 3 so that the closed magnetic ring 21 is located at the outer end of the test piece. After the heating is completed, the temperature of the outer end and the inner side of the test piece is measured to determine the temperature difference between the outer end and the inner side of the test piece. When the temperature difference between the outer end and the inner side of the test piece is controlled within 20°C, it is qualified. When the temperature difference between the outer end and the inner side of the test piece exceeds 20°C, continue to adjust the position of the closed magnetic ring 21 until the temperature difference meets the requirement and start normal production.

[0030] In the utility model, under the action of the adjusting device 3, the closed magnetic ring 21 is adjusted to the opening of the furnace body 13, so that the closed magnetic ring 21 is located at the end of the product. The closed magnetic ring 21 plays a role in weakening the magnetic field, thereby making the magnetic force in the furnace body 13 more uniform, so that the product in the furnace body 13 is heated more evenly, thereby improving the production quality.

[0031] To adjust the position of the closed magnetic ring 21, please refer to Figure 1 In a preferred embodiment, the adjusting device 3 includes a lifting mechanism 31 and a supporting mechanism 32 arranged on the furnace body 13. The lifting mechanism 31 is located above the closed magnetic ring 21, and the lifting mechanism 31 is used to lift the closed magnetic ring 21. The supporting mechanism 32 is located below the closed magnetic ring 21, and the supporting mechanism 32 is used to support the closed magnetic ring 21.

[0032] When in use, the lifting mechanism 31 is used to lift the closed magnetic ring 21 , and the supporting mechanism 32 is used to support the closed magnetic ring 21 . Under the joint action of the lifting mechanism 31 and the supporting mechanism 32 , the closed magnetic ring 21 is fixed in the furnace body 13 .

[0033] To pull the closed magnetic ring 21, please refer to Figure 2 In a preferred embodiment, the lifting mechanism 31 includes a first leg 311 fixedly connected to both sides of the closed magnetic ring 21, the first leg 311 is in a horizontal state, the first leg 311 extends along the axial direction of the furnace body 13, and the two first legs 311 extend outside the furnace body 13.

[0034] A second leg 312 is fixedly connected to one end of the first leg 311 away from the closed magnetic ring 21. The second leg 312 is in a horizontal state and extends radially along the furnace body 13. A third leg 313 is fixedly connected to the second leg 312 and is in a vertical state.

[0035] Two hoses 314 are fixedly connected to the frame 12 above the furnace body 13. The two hoses 314 are in a vertical state. One end of the two hoses 314 away from the frame 12 is respectively mounted on two third legs 313. The third legs 313 are provided with a fixing assembly 315 for fixing the hoses 314.

[0036] When in use, under the action of the fixing assembly 315, the hose 314 is pressed against the third leg 313, thereby lifting and pulling the closed magnetic ring 21. The hose 314 has good flexibility and can adjust the position of the closed magnetic ring 21.

[0037] To fix the third leg 313 and the hose 314 together, please refer to Figure 2In a preferred embodiment, the fixing assembly 315 includes a clamp 316 sleeved on the hose 314 , and the clamp 316 is used to press the hose 314 onto the third leg 313 .

[0038] When in use, the hose 314 is sleeved on the third leg 313, and then the clamp 316 is used to clamp the hose 314. The operation is convenient and the fixation is stable. The clamp 316 can be purchased directly, which reduces the production cost and improves the production efficiency.

[0039] To support the closed magnetic ring 21, please refer to Figure 3 In a preferred embodiment, the supporting mechanism 32 includes two pads 321 disposed at the ends of the furnace body 13 , the two pads 321 are both made of wood, and the two second legs 312 are respectively abutted against the two pads 321 .

[0040] When in use, the two pads 321 are respectively in contact with the bottom of the two second legs 312, thereby supporting the closed magnetic ring 21. The wooden pads 321 are soft in texture, which reduces the wear of the second legs 312 and increases the service life of the second legs 312. The wooden pads 321 have a large friction force, which reduces the possibility of sliding and deflection of the closed magnetic ring 21, and fixes it more firmly, thereby making the magnetic force distribution in the furnace body 13 more uniform and improving the production quality.

[0041] In order to increase the contact area between the second leg 312 and the pad 321, please refer to Figure 3 In a preferred embodiment, the extension direction of the second leg 312 is the same as the extension direction of the pad 321.

[0042] When in use, the contact area between the second leg 312 and the pad 321 is increased, the stability is further improved, the possibility of sliding and deflection of the closed magnetic ring 21 is reduced, and the production quality is improved.

[0043] To increase the service life of the pad 321, please refer to Figure 3 In a preferred embodiment, the two pads 321 are both located at the bottom of the furnace body 13 .

[0044] During use, when the product in the furnace body 13 is heated, the hot air generated in the furnace body 13 flows upward. When the pad 321 is located at the bottom of the furnace body 13, the temperature around the pad 321 is low, which reduces the possibility of damage to the pad 321 and increases the service life of the pad 321.

[0045] To adjust the position of the pad 321, refer to Figure 3In a preferred embodiment, support rods 322 are fixedly connected to both sides of the end of the furnace body 13, and the support rods 322 extend along the axial direction of the furnace body 13. The two pads 321 are respectively slidably connected to the two support rods 322, and the support rods 322 are provided with locking components 323 for locking the pads 321.

[0046] When in use, push the pad 321 to slide along the support rod 322. After adjusting the pad 321 to a predetermined position, adjust the position of the closed magnetic ring 21, thereby increasing the adjustment range of the position of the closed magnetic ring 21 and making the adjustment range of the closed magnetic ring 21 compatible with the length of the induction coil, thereby improving the production quality.

[0047] To fix the spacer 321, please refer to Figure 3 In a preferred embodiment, the locking assembly 323 includes two nuts 324 disposed on the support rod 322 , and the two nuts 324 are respectively pressed against two ends of the cushion block 321 .

[0048] When in use, after the cushion block 321 is slid along the support rod 322 to a predetermined position, the two nuts 324 are screwed toward the cushion block 321 until the two nuts 324 are respectively pressed against the two ends of the cushion block 321. The operation is convenient and the fixation is stable.

[0049] To improve the stability of the pad 321, please refer to Figure 3 In a preferred embodiment, a gasket 325 is provided on the support rod 322 between the cushion block 321 and the nut 324 .

[0050] When in use, the contact area between the nut 324 and the spacer block 321 is increased, further improving stability.

[0051] In order to better understand the present invention, the following Figure 1 - Figure 3 The working principle of the technical solution of a medium frequency induction heating furnace of the utility model is described in detail: when in use, the heating uniformity of the furnace body 13 is tested, the test piece is placed in the furnace body 13, a short-circuit current is passed through the induction coil through the control cabinet 11, the test piece is heated, and a short-circuit current is passed through the closed magnetic ring 21. The power of the short-circuit current needs to be determined according to the number of turns of the induction coil. The position of the closed magnetic ring 21 is adjusted by the adjustment device 3 so that the closed magnetic ring 21 is located at the outer end of the test piece. After the heating is completed, the temperature of the outer end and the inner side of the test piece is measured to determine the temperature difference between the outer end and the inner side of the test piece. When the temperature difference between the outer end and the inner side of the test piece is controlled within 20°C, it is qualified. When the temperature difference between the outer end and the inner side of the test piece exceeds 20°C, the position of the closed magnetic ring 21 continues to be adjusted until the temperature difference meets the requirement and normal production begins.

[0052] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A medium frequency induction heating furnace, characterized in that: include: A heating device, the heating device comprising a control cabinet and a frame arranged on one side of the control cabinet, a furnace body is arranged on the frame, an induction coil is arranged in the furnace body, the induction coil is electrically connected to the control cabinet, and a material channel is arranged in the furnace body; A control device, the control device comprising a closed magnetic loop disposed in the material channel; and The adjusting device is arranged on the furnace body and is used to adjust the position of the closed magnetic ring.

2. A medium frequency induction heating furnace according to claim 1, characterized in that: The adjusting device comprises a lifting mechanism and a supporting mechanism which are arranged on the furnace body. The lifting mechanism is used to lift the closed magnetic ring, and the supporting mechanism is used to support the closed magnetic ring.

3. A medium frequency induction heating furnace according to claim 2, characterized in that: The lifting mechanism includes a first leg arranged on both sides of the closed magnetic ring, the two first legs extend outside the furnace body, the first leg is provided with a second leg at one end away from the closed magnetic ring, the second leg is provided with a third leg, the frame is provided with two hoses, the ends of the two hoses away from the frame are respectively mounted on the two third legs, and the third legs are provided with a fixing assembly for fixing the hoses.

4. A medium frequency induction heating furnace according to claim 3, characterized in that: The fixing assembly comprises a clamp sleeved on the hose, and the clamp is used to press the hose tightly onto the third leg.

5. The medium frequency induction heating furnace according to claim 3, characterized in that: The supporting mechanism comprises two pads arranged at the ends of the furnace body, and the two second legs are respectively abutted against the two pads.

6. A medium frequency induction heating furnace according to claim 5, characterized in that: The extending direction of the second supporting leg is the same as the extending direction of the pad.

7. The medium frequency induction heating furnace according to claim 5, characterized in that: The two pads are both located at the bottom of the furnace body.

8. The medium frequency induction heating furnace according to claim 5, characterized in that: Support rods are arranged on both sides of the furnace body end, and the two cushion blocks are respectively slidably connected to the two support rods, and locking components for locking the cushion blocks are arranged on the support rods.

9. The medium frequency induction heating furnace according to claim 8, characterized in that: The locking assembly comprises two nuts arranged on the support rod, and the two nuts are respectively pressed against two ends of the cushion block.

10. The medium frequency induction heating furnace according to claim 9, characterized in that: A gasket is arranged on the support rod between the cushion block and the nut.

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