Permanent magnet induction heating device and heating method thereof

Abstract

The invention relates to the technical field of metal rod heating, in particular to a permanent magnet induction heating device and a heating method.The heating device comprises a plurality of pairs of heating assemblies arranged in sequence, each heating assembly comprises a hollow motor, a magnetic cylinder and a permanent magnet ring, and the magnetic cylinder is arranged on the inner wall of the hollow motor in the circumferential direction and can rotate around the axis of the magnetic cylinder; a plurality of permanent magnet rings are sequentially arranged in the magnetic cylinder in the axial direction of the magnetic cylinder, and the magnetic induction intensity of the inner side of the magnetic cylinder is larger than that of the outer side of the magnetic cylinder through the permanent magnet rings. A specific structure and a specific heating mode are adopted, the metal rod can be uniformly heated, the temperature difference between the core and the surface is smaller than or equal to 15 DEG C, meanwhile, the uniform heating time can be saved, axial temperature distribution is uniform, and energy consumption is reduced; the permanent magnet blocks are arranged in a specific Halbach array and adopt a specific magnetizing direction, so that the magnetic induction intensity of the inner side of the permanent magnet ring can be improved, the heating power is improved, and the heating efficiency reaches up to 80% or above.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal rod heating, in particular to a permanent magnet induction heating device and a heating method thereof. BACKGROUND

[0002] Permanent magnet heating is a new and advanced heating method. As soon as permanent magnet heating appeared, it immediately attracted the attention and favor of the metal industry, and the permanent magnet induction heating device for metal rod heating emerged as the times required.

[0003] For the traditional permanent magnet induction heating device, it is not suitable for heating the continuously fed metal rod, which restricts the production rhythm. SUMMARY

[0004] The present application provides a permanent magnet induction heating device and a heating method thereof to solve the problem that the traditional permanent magnet induction heating device is not suitable for heating the continuously fed metal rod, which restricts the production rhythm.

[0005] In one aspect, the present application provides a permanent magnet induction heating device, comprising a plurality of pairs of heating assemblies arranged in sequence, each heating assembly comprising:

[0006] A hollow motor;

[0007] A magnetic cylinder, which is arranged circumferentially on the inner wall of the hollow motor and can rotate around its axis, and a plurality of permanent magnet rings are arranged in sequence in the magnetic cylinder along the axial direction of the magnetic cylinder, the permanent magnet ring makes the magnetic induction intensity of the inner side of the magnetic cylinder greater than that of the outer side of the magnetic cylinder.

[0008] In one possible design, each permanent magnet ring comprises a plurality of permanent magnet units distributed circumferentially, and each permanent magnet unit comprises a first magnetic block, a second magnetic block, a third magnetic block, a fourth magnetic block, a fifth magnetic block and a sixth magnetic block arranged in sequence along the clockwise direction;

[0009] The magnetization direction of the first magnetic block is directed to the outer side of the permanent magnet ring and deviated by a preset angle a along the radial direction of the permanent magnet ring clockwise, the magnetization direction of the second magnetic block is directed along the circumferential direction of the permanent magnet ring clockwise, the magnetization direction of the third magnetic block is directed to the inner side of the permanent magnet ring and deviated by a preset angle a along the radial direction of the permanent magnet ring counterclockwise, the magnetization direction of the fourth magnetic block is directed to the inner side of the permanent magnet ring and deviated by a preset angle a along the radial direction of the permanent magnet ring clockwise, the magnetization direction of the fifth magnetic block is directed along the circumferential direction of the permanent magnet ring counterclockwise, and the magnetization direction of the sixth magnetic block is directed to the outer side of the permanent magnet ring and deviated by a preset angle a along the radial direction of the permanent magnet ring counterclockwise.

[0010] In one possible design, the preset angle a is 0°-90°.

[0011] In one possible design, the preset angle a is 25°-45°.

[0012] In a possible design, the preset angle a is 30-40°.

[0013] In a possible design, each permanent magnet ring comprises 2-5 permanent magnet units arranged in sequence in the circumferential direction.

[0014] In a possible design, the cross sections of the first magnetic block, the second magnetic block, the third magnetic block, the fourth magnetic block, the fifth magnetic block and the sixth magnetic block are all arranged as fan ring shapes, the radial thickness and the axial thickness of the first magnetic block, the second magnetic block, the third magnetic block, the fourth magnetic block, the fifth magnetic block and the sixth magnetic block are all arranged as a preset thickness, and the preset thickness is 35-45 mm.

[0015] In a possible design, the magnetic induction intensity on the inner side of the magnetic cylinder is arranged as 0.6-1.0 T.

[0016] In a possible design, the rotating speeds of the two heating assemblies are the same, the rotating directions thereof are opposite, and the rotating speeds are all arranged as a preset rotating speed, and the preset rotating speed is 500-1500 rpm.

[0017] In a possible design, the feeding mechanism and the discharging mechanism are further included, and the feeding mechanism and the discharging mechanism both comprise:

[0018] The clamping assembly comprises a first V-shaped block and a second V-shaped block arranged oppositely, a first driving member connected with the first V-shaped block, and rollers arranged on the first V-shaped block and the second V-shaped block respectively, the first driving member can make the first V-shaped block and the second V-shaped block approach each other to clamp the metal rod, and the central axis of the clamping assembly is consistent with the central axis of the heating assembly.

[0019] The moving assembly comprises a sliding frame arranged on the workbench, a second driving member arranged on the sliding frame, a gear rack arranged on the workbench and meshed with the gear of the output end of the second driving member, a guide rail arranged on the workbench, a sliding block arranged on the guide rail and arranged on the bottom of the sliding frame, a plurality of guide wheels arranged on the workbench, and a clamping block arranged on the inner side wall of the sliding frame, and the second driving member can drive the sliding frame to move the metal rod.

[0020] On the other hand, the application further provides a permanent magnet induction heating method, which adopts the permanent magnet induction heating device, and comprises the following steps:

[0021] Step one, sequentially conveying the metal rod to be heated to the heating assembly, so that the front end of the metal rod to be heated is close to the feeding end of the heating assembly;

[0022] Step two, starting the heating assembly, rotating the heating assembly along the central axis thereof at a preset rotating speed, and sequentially feeding the metal rod to be heated into the heating assembly by a preset length in a preset time unit;

[0023] Step three, the metal rod is heated by the heating assembly in sequence;

[0024] Step four, the heated metal rod is output from the heating assembly in sequence.

[0025] In one possible design, in step two, when the metal rod is an aluminum rod, the preset time t satisfies the following condition formula:

[0026]

[0027] In the formula, m is the mass of the aluminum rod, c is the specific heat capacity of the aluminum material, Δt is the difference between the target temperature and the normal temperature, k is a proportional constant, p is the number of permanent magnet units, n is the preset rotating speed, B is the magnetic induction intensity of the surface of the permanent magnet heating unit, S is the cross-sectional area of the aluminum rod acting on the magnetic field, and L is the effective length of the aluminum rod acting on the magnetic field.

[0028] The beneficial effects of the present application are as follows:

[0029] The permanent magnet induction heating device of the present application can improve the magnetic induction intensity on the inner side of the permanent magnet ring, improve the heating power, and the heating efficiency is as high as 80% or more by adopting the specific Halbach array arrangement of the permanent magnet units and magnetizing each magnetic block in the permanent magnet units in a specific direction. Meanwhile, a magnetic field with appropriate intensity and uniform distribution can be formed on the inner side of the magnetic cylinder, the metal rod can be uniformly heated, the axial temperature distribution is uniform, the core surface temperature difference is ≤15℃, and energy consumption is saved.

[0030] The permanent magnet induction heating device of the present application can realize continuous feeding, heating and discharging of the metal rod by setting the feeding mechanism and the discharging mechanism, so as to continuously heat the metal rod and improve the production efficiency. By setting the heating assemblies in pairs, the combined torque of the heating assemblies can be almost zero, effectively improving the running stability of the device.

[0031] The permanent magnet induction heating method of the present application can adapt to the heating needs of metal rods of different materials (such as aluminum, magnesium, titanium, etc.) and different specifications by controlling the preset rotating speed of the heating assembly, the number of permanent magnet units, the preset angle a, and the feeding time and feeding length of the metal rod, etc. It has wide applicability. Especially for aluminum rods, through a specific preset time calculation formula, the heating process can be accurately controlled to ensure that the aluminum rod is heated to the target temperature, meeting the requirements of aluminum rod extrusion molding process, etc. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 Structure diagram of the permanent magnet induction heating device provided by the embodiment of the present application;

[0034] Figure 2 Structure diagram of the heating assembly of the permanent magnet induction heating device provided by the embodiment of the present application;

[0035] Figure 3 Longitudinal sectional view of the heating assembly of the permanent magnet induction heating device provided by the embodiment of the present application;

[0036] Figure 4 Structure diagram of the permanent magnet ring of the permanent magnet induction heating device provided by the embodiment of the present application;

[0037] Figure 5 Result graph of the parameterization simulation in the magnetizing direction;

[0038] Figure 6 Heating power diagram;

[0039] Figure 7 Aluminum bar magnetic field distribution cloud Figure 1 ;

[0040] Figure 8 Aluminum bar magnetic field distribution cloud Figure 2 ;

[0041] Figure 9 Aluminum bar heating temperature distribution diagram;

[0042] Figure 10 Structure diagram of the clamping assembly of the permanent magnet induction heating device provided by the embodiment of the present application;

[0043] Figure 11 Structure diagram of the moving assembly of the permanent magnet induction heating device provided by the embodiment of the present application;

[0044] Figure 12 Heating method diagram;

[0045] Figure 13 Aluminum bar temperature distribution diagram.

[0046] Reference signs:

[0047] 1. Moving component; 11. Second drive component; 12. Rack; 13. Sliding frame; 14. Guide wheel; 15. Slider; 16. Guide rail; 17. Worktable; 2. Clamping component; 21. First V-block; 22. Second V-block; 23. Mounting frame; 24. First drive component; 3. Heating component; 31. Fan; 32. Magnetic flap fixing cylinder; 33. Front end cover; 34. Hollow motor; 35. Heat insulation cover; 36. Magnet fixing seat; 37. Rear end cover; 38. Connecting sleeve; 39. Permanent magnet ring; 391. First magnetic block; 392. Second magnetic block; 393. Third magnetic block; 394. Fourth magnetic block; 395. Fifth magnetic block; 396. Sixth magnetic block; 4. Metal rod. Detailed Implementation

[0048] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] The following is combined Figures 1-13 This describes the permanent magnet induction heating device provided in the embodiments of this application.

[0050] Reference Figure 1 and Figure 2 As shown, the permanent magnet induction heating device provided in this embodiment includes several pairs of heating components 3 arranged sequentially. The two heating components 3 in each pair rotate in opposite directions, rotate at the same speed, and have the same central axis, which makes the resultant torque of the several pairs of heating components 3 almost zero. In some embodiments, a fan 31 is provided between two heating components 3. The heating component 3 includes a hollow motor 34 fixed to the heating station and a magnetic cylinder fixed to the circumferential direction of the inner wall of the hollow motor 34. The magnetic cylinder can rotate together with the hollow motor 34 around the central axis of the hollow motor 34. The fan 31 can cool the heating component 3 by means of a connecting sleeve 38 provided on the magnetic cylinder.

[0051] Reference Figure 3The diagram shows a schematic of a heating assembly in an embodiment of this application. The magnetic cylinder includes a magnetic flap fixing cylinder 32 fixed to the circumferential inner wall of the hollow motor 34, a magnet fixing seat 36 fixed to the circumferential inner wall of the magnetic flap fixing cylinder 32, a plurality of permanent magnet rings 39 fixed to the circumferential inner wall of the magnet fixing seat 36 and arranged sequentially along the axial direction of the magnetic cylinder, a heat insulation cover 35 disposed on the circumferential inner wall of the plurality of permanent magnet rings 39, and a front end cover 33 and a rear end cover 37 respectively disposed at both ends of the magnet fixing seat 36. When the hollow motor 34 rotates, it can drive the plurality of permanent magnet rings 39 to rotate to generate a rotating magnetic field and heat the metal rod 4. At the same time, the magnetic cylinder is provided with a cooling channel connected to the fan 31 through a connecting sleeve 38. An air gap is left between the metal rod 4 and the magnetic cylinder. The fan 31 blows air to dissipate heat from the heating assembly 3 and to uniformly heat the metal rod 4.

[0052] like Figure 4 The diagram shown is a structural schematic of a permanent magnet ring according to an embodiment of this application. A permanent magnet ring 39 includes three permanent magnet units, each unit comprising six permanent magnet blocks, with three permanent magnet blocks fixed together. Each permanent magnet unit includes a first magnetic block 391, a second magnetic block 392, a third magnetic block 393, a fourth magnetic block 394, a fifth magnetic block 395, and a sixth magnetic block 396 arranged sequentially in a clockwise direction. The magnetization direction of the first magnetic block 391 is towards the outside of the permanent magnet ring 39 and deflected clockwise by a predetermined angle α along the radial direction of the permanent magnet ring 39; the magnetization direction of the second magnetic block 392 is clockwise along the circumference of the permanent magnet ring 39; the magnetization direction of the third magnetic block 393 is towards the inside of the permanent magnet ring 39 and deflected counterclockwise by a predetermined angle α along the radial direction of the permanent magnet ring 39; the magnetization direction of the fourth magnetic block 394 is towards the inside of the permanent magnet ring 39 and deflected clockwise by a predetermined angle α along the radial direction of the permanent magnet ring 39; the magnetization direction of the fifth magnetic block 395 is counterclockwise along the circumference of the permanent magnet ring 39; and the magnetization direction of the sixth magnetic block 396 is towards the outside of the permanent magnet ring 39 and deflected counterclockwise by a predetermined angle α along the radial direction of the permanent magnet ring 39. By adopting the above magnetization directions, the magnetic field generated by the permanent magnet unit can cooperate in the circumferential and radial directions, forming a magnetic field distribution that is more conducive to the induction heating of the metal rod 4, further improving heating efficiency and uniformity.

[0053] The preset angle α ranges from 0° to 90°. In practical applications, to achieve better heating results, the preset angle α is preferably 25°-45°, and more preferably 30°-40°. Within this angle range, the distribution and intensity of the magnetic field can better meet the induction heating requirements of the metal rod 4, effectively improving heating efficiency and uniformity.

[0054] In some embodiments, each permanent magnet ring 39 includes 2-5 permanent magnet units arranged circumferentially. By reasonably selecting the number of permanent magnet units, it is possible to balance the structural complexity and manufacturing cost of the device while ensuring the magnetic field strength and uniformity.

[0055] In order to facilitate installation and ensure the stability of the magnetic field, the cross sections of the first magnetic block 391, the second magnetic block 392, the third magnetic block 393, the fourth magnetic block 394, the fifth magnetic block 395 and the sixth magnetic block 396 are all set as fan ring shapes. Meanwhile, the radial thickness and the axial thickness of the first magnetic block 391, the second magnetic block 392, the third magnetic block 393, the fourth magnetic block 394, the fifth magnetic block 395 and the sixth magnetic block 396 are all set as a preset thickness, and the preset thickness is 35mm-45mm. Within this thickness range, the magnetic blocks can have sufficient magnetic performance, and at the same time, it is convenient for processing and installation, and the overall structural strength of the permanent magnet ring 39 is ensured.

[0056] In order to ensure the heating effect, the magnetic induction intensity inside the magnetic cylinder is set to 0.6T-1.0T. Within this magnetic induction intensity range, a sufficient strength eddy current can be induced inside the metal rod 4 to achieve rapid and efficient heating, while avoiding excessive equipment loss due to excessively high magnetic induction intensity.

[0057] Meanwhile, the rotational speeds of the two heating assemblies 3 in pairs are the same and are all set as a preset rotational speed, and the preset rotational speed is 500rpm-1500rpm. By controlling the rotational speed of the heating assembly 3, the change frequency of the magnetic field can be adjusted to adapt to the heating needs of metal rods 4 of different materials and different specifications, and the stability and efficiency of the heating process are ensured.

[0058] After parameterized simulation of the magnetization direction of the permanent magnet blocks (as shown in Figure 5 , when the radial magnetization direction is deflected by a certain angle, the magnetic induction intensity can be enhanced, and thus the heating power of the aluminum rod is improved. Specifically, the magnetization direction of the first magnetic block 391 is to point to the outside of the permanent magnet ring 39 and to deflect 35° clockwise along the radial direction of the permanent magnet ring 39, the magnetization direction of the second magnetic block 392 is to point clockwise along the circumferential direction of the permanent magnet ring 39, the magnetization direction of the third magnetic block 393 is to point to the inside of the permanent magnet ring 39 and to deflect 35° counterclockwise along the radial direction of the permanent magnet ring 39, the magnetization direction of the fourth magnetic block 394 is to point to the inside of the permanent magnet ring 39 and to deflect 35° clockwise along the radial direction of the permanent magnet ring 39, the magnetization direction of the fifth magnetic block 395 is to point counterclockwise along the circumferential direction of the permanent magnet ring 39, and the magnetization direction of the sixth magnetic block 396 is to point to the outside of the permanent magnet ring 39 and to deflect 35° counterclockwise along the radial direction of the permanent magnet ring 39, at this time the heating power can reach the maximum value (as shown in Figure 6 , and due to the skin effect, the magnetic induction intensity is the strongest on the surface of the aluminum rod (as shown in Figure 7 , Figure 8 , the surface temperature of the aluminum rod is higher during heating, and the temperature of the two ends of the aluminum rod is low and the temperature in the middle is high (as shown in Figure 9 .

[0059] In order to realize the continuous feeding and discharging of the metal rod 4 and ensure the continuity of the heating process, the device further comprises a feeding mechanism capable of continuous feeding and a discharging mechanism capable of continuous discharging. As shown in Figure 1 the aluminum rod can enter the heating assembly 3 through the feeding assembly, be inductively heated by the heating assembly 3, and then be moved out of the heating assembly 3 through the discharging assembly.

[0060] Referring to Figure 1 in some embodiments, the feeding mechanism and the discharging mechanism each comprise a clamping assembly 2 and a moving assembly 1. The clamping assembly 2 is used to clamp the metal rod 4, and the moving assembly 1 is used to move the metal rod 4.

[0061] Specifically, referring to Figure 10 the clamping assembly 2 comprises a mounting frame 23 provided on the heating platform, first and second V-shaped blocks 21 and 22 oppositely provided on the inner side walls of the mounting frame 23, a first driving member 24 provided on the mounting frame 23, and rollers respectively provided on the first and second V-shaped blocks 21 and 22. The first driving member 24 is connected with the first V-shaped block 21 and can drive the first V-shaped block 21 to approach or move away from the second V-shaped block 22, so as to clamp and fix the metal rod 4 when the first V-shaped block 21 and the second V-shaped block 22 approach each other. The rollers provided on the first and second V-shaped blocks 21 and 22 can reduce the friction between the metal rod 4 and the clamping assembly 2 during feeding and discharging, avoid damage to the surface of the metal rod 4, and facilitate the movement of the metal rod 4.

[0062] In order to ensure that the metal rod 4 can accurately enter the heating assembly 3 for heating, the central axis of the clamping assembly 2 is consistent with the central axis of the heating assembly 3.

[0063] Specifically, referring to Figure 11 the moving assembly 1 comprises a sliding frame 13 provided on the workbench 17, a second driving member 11 provided on the sliding frame 13, a gear rack 12 provided on the workbench 17 and meshing with the gear of the output end of the second driving member 11, a guide rail 16 provided on the workbench 17, a sliding block 15 provided on the guide rail 16 and at the bottom of the sliding frame 13, a plurality of guide wheels 14 provided on the workbench 17, and a clamping block provided on the inner side wall of the sliding frame 13.

[0064] When it is necessary to move the metal rod 4, the second drive component 11 is activated, and the gear at its output end meshes with the rack 12 for transmission. The slider 15 cooperates with the guide rail 16, driving the sliding frame 13 to move along the guide rail 16. The clamping block located on the inner wall of the sliding frame 13 can cooperate with the clamping assembly 2 to achieve stable clamping and movement of the metal rod 4, ensuring that the metal rod 4 can enter or leave the heating assembly 3 at a preset speed and length. During the movement of the metal rod 4, the guide wheel 14 can guide and support the metal rod 4, further ensuring the smoothness of the movement of the metal rod 4.

[0065] This application also provides a permanent magnet induction heating method, which uses the permanent magnet induction heating device described in the above embodiments and includes the following steps:

[0066] The metal rods 4 to be heated are sequentially fed to the heating assembly 3 so that the front end of the metal rods 4 is close to the feed end of the heating assembly 3. In this step, the metal rods 4 are clamped and fixed by the clamping assembly 2 of the feeding mechanism to ensure that the position of the metal rods 4 is accurate, thus preparing for subsequent feeding and heating.

[0067] Start the heating assembly 3, which causes the hollow motor 34 in the heating assembly 3 to drive the permanent magnet ring 39 in the magnetic cylinder to rotate. At the same time, the moving component 1 of the feeding mechanism drives the metal rod 4 to be heated to be fed into the heating assembly 3 in a preset time unit for a preset length.

[0068] By controlling the feeding speed and length of the metal rod 4, it is possible to ensure that the metal rod 4 is fully heated in the heating assembly 3, avoiding localized underheating or overheating. For metal rods 4 made of different materials, relevant parameters need to be adjusted according to their characteristics. When the metal rod 4 is an aluminum rod, the preset time t satisfies the following condition:

[0069]

[0070] In the formula: m is the mass of the aluminum rod; c is the specific heat capacity of the aluminum material; Δt is the difference between the target temperature and the room temperature; k is the proportionality constant; p is the number of permanent magnet units; n is the preset rotation speed; B is the magnetic induction intensity of the surface of the permanent magnet heating unit; S is the cross-sectional area of ​​the aluminum rod interacting with the magnetic field; L is the effective length of the aluminum rod under the influence of the magnetic field.

[0071] This conditional formula allows for the precise calculation of the preset time during the heating process of the aluminum rod, thereby ensuring that the aluminum rod can be accurately heated to the target temperature to meet the requirements of subsequent processing.

[0072] During the rotation of the heating component 3, the magnetic field generated by the permanent magnet ring 39 inside it moves relative to the metal rod 4, inducing eddy currents inside the metal rod 4. When the eddy currents flow inside the metal rod 4, Joule heating is generated due to the resistance of the metal rod 4 itself, thereby heating the metal rod 4.

[0073] The heated metal rods 4 are sequentially output from the heating assembly 3 by the discharging mechanism. The structure and working principle of the discharging mechanism are similar to those of the feeding mechanism. The heated metal rods 4 are clamped and fixed by the clamping assembly 2, and then the moving assembly 1 drives the metal rods 4 away from the heating assembly 3, providing them with the heated metal rods 4 for subsequent processing. Simultaneously, the feeding mechanism can continue to feed the next metal rod 4 to be heated, achieving continuous heating of the metal rods 4 and improving production efficiency.

[0074] Reference Figure 12 As shown, in one embodiment of this application, the entire aluminum rod is heated in four stages, with each stage lasting 25 seconds. The magnetic induction intensity inside the magnetic cylinder of the heating assembly is 0.67T, the rotation speed of the heating assembly is 1000 rpm, the feed length of the aluminum rod in each stage is 300 mm, and the diameter of the aluminum rod is 178 mm. After heating, the final temperature distribution of the aluminum rod is uniform and above 420°C (e.g., ...). Figure 13 (As shown).

[0075] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A permanent magnet induction heating device, characterized in that, It includes several pairs of heating components arranged sequentially, each heating component comprising: Hollow motor; A magnetic cylinder is disposed on the inner wall of the hollow motor and can rotate around its own axis. Multiple permanent magnet rings are arranged sequentially along the axial direction of the magnetic cylinder inside the magnetic cylinder. The permanent magnet rings make the magnetic induction intensity inside the magnetic cylinder greater than the magnetic induction intensity outside the magnetic cylinder.

2. The permanent magnet induction heating device according to claim 1, characterized in that, Each of the permanent magnet rings includes a plurality of permanent magnet units distributed circumferentially, and each of the permanent magnet units includes a first magnetic block, a second magnetic block, a third magnetic block, a fourth magnetic block, a fifth magnetic block and a sixth magnetic block arranged in a clockwise order; The magnetization direction of the first magnetic block is pointing towards the outside of the permanent magnet ring and deflected clockwise by a preset angle α along the radial direction of the permanent magnet ring. The magnetization direction of the second magnetic block is pointing clockwise along the circumference of the permanent magnet ring. The magnetization direction of the third magnetic block is pointing towards the inside of the permanent magnet ring and deflected counterclockwise by a preset angle α along the radial direction of the permanent magnet ring. The magnetization direction of the fourth magnetic block is pointing towards the inside of the permanent magnet ring and deflected clockwise by a preset angle α along the radial direction of the permanent magnet ring. The magnetization direction of the fifth magnetic block is pointing counterclockwise along the circumference of the permanent magnet ring. The magnetization direction of the sixth magnetic block is pointing towards the outside of the permanent magnet ring and deflected counterclockwise by a preset angle α along the radial direction of the permanent magnet ring.

3. The permanent magnet induction heating device according to claim 2, characterized in that, The preset angle α is 0°-90°.

4. The permanent magnet induction heating device according to claim 3, characterized in that, The preset angle α is 25°-45°.

5. The permanent magnet induction heating device according to claim 4, characterized in that, The preset angle α is 30°-40°.

6. The permanent magnet induction heating device according to claim 2, characterized in that, Each of the permanent magnet rings includes 2-5 permanent magnet units arranged circumferentially.

7. The permanent magnet induction heating device according to claim 6, characterized in that, The cross-sections of the first, second, third, fourth, fifth, and sixth magnetic blocks are all configured as fan-shaped rings. The radial and axial thicknesses of the first, second, third, fourth, fifth, and sixth magnetic blocks are all set to a preset thickness of 35mm-45mm.

8. The permanent magnet induction heating device according to claim 1, characterized in that, The magnetic induction intensity inside the magnetic cylinder is set to 0.6T-1.0T.

9. The permanent magnet induction heating device according to any one of claims 1 to 8, characterized in that, The two heating components in a pair have the same rotation speed, opposite rotation directions, and are both set to a preset rotation speed of 500 rpm to 1500 rpm.

10. The permanent magnet induction heating device according to claim 1, characterized in that, It also includes a continuously feeding mechanism and a continuously discharging mechanism, wherein both the feeding mechanism and the discharging mechanism include: The clamping assembly includes a first V-block and a second V-block disposed opposite to each other, a first driving member connected to the first V-block, and rollers respectively disposed on the first V-block and the second V-block. The first driving member enables the first V-block and the second V-block to move closer to each other to clamp the metal rod. The central axis of the clamping assembly is consistent with the central axis of the heating assembly. The moving component includes a sliding frame mounted on a worktable, a second driving member mounted on the sliding frame, a rack mounted on the worktable and meshing with a gear at the output end of the second driving member, a guide rail mounted on the worktable, a slider mounted on the guide rail and located at the bottom of the sliding frame, a plurality of guide wheels mounted on the worktable, and a clamping block mounted on the inner sidewall of the sliding frame. The second driving member enables the sliding frame to move a metal rod.

11. A permanent magnet induction heating method, employing the permanent magnet induction heating device described in any one of claims 1-10, characterized in that, Includes the following steps: Step 1: The metal rods to be heated are sequentially fed to the heating assembly so that the front end of the metal rods is close to the feed end of the heating assembly; Step 2: Start the heating component and rotate it along its central axis at a preset speed. At the same time, the metal rods to be heated are fed into the heating component in preset time units of preset length. Step 3: The heating components heat the metal rods sequentially; Step four: The heated metal rods are output sequentially from the heating assembly.

12. The permanent magnet induction heating method according to claim 11, characterized in that, In step two, when the metal rod is an aluminum rod, the preset time t satisfies the following condition: In the formula: m is the mass of the aluminum rod; c is the specific heat capacity of the aluminum material; Δt is the difference between the target temperature and the room temperature; k is the proportionality constant; p is the number of permanent magnet units; n is the preset rotation speed; B is the magnetic induction intensity of the surface of the permanent magnet heating unit; S is the cross-sectional area of ​​the aluminum rod interacting with the magnetic field; L is the effective length of the aluminum rod under the influence of the magnetic field.

Images