Aluminum bar permanent magnet induction heating device for aluminum alloy profile extrusion

Abstract

The utility model relates to the technical field of heating equipment, in particular to an aluminum bar permanent magnet induction heating device for extruding aluminum alloy sections, which mainly solves the problem of poor heating uniformity of an aluminum bar heating device in the prior art, and comprises a rack, a power supply system, a control system, a conveying mechanism, a pushing mechanism and a heating mechanism, the conveying mechanism is arranged on the machine frame and used for conveying aluminum bars, the heating mechanism is arranged on the machine frame, a conveying channel allowing the conveying mechanism to penetrate through is formed in the heating mechanism, the heating mechanism comprises a shell and at least three permanent magnet assemblies, through holes are formed in the central axes of the permanent magnet assemblies, and the through holes are communicated with the shell. The permanent magnet assemblies are sequentially distributed in the longitudinal direction, the central axis of a through hole of each permanent magnet assembly coincides with the central axis of the conveying channel, each permanent magnet assembly comprises 6-8 permanent magnet units distributed in an annular array, and an electromagnet is embedded between every two adjacent permanent magnet units located on the same permanent magnet assembly.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, and in particular to a permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion. Background Technology

[0002] Aluminum rods are a type of aluminum product. Before extruding aluminum rods into aluminum profiles, they need to be heated. Usually, a heating furnace with resistance heating rods is used for this process. However, existing aluminum rod heating furnaces have complex structures, are inconvenient to operate, and have poor heating and heat preservation effects.

[0003] With technological advancements, electromagnetic induction heating technology, with its high heating rate, has been widely applied in the metal smelting field. Consequently, electromagnetic induction furnaces are gradually replacing resistance heating rod furnaces. Induction heating utilizes electromagnetic induction to generate current within the material being heated, relying on the energy of these eddy currents to achieve heating. The basic components of an induction heating system include an induction coil, an AC power supply, and the workpiece. Depending on the object being heated, the coil can be made into different shapes. The coil is connected to the power supply, which provides alternating current to the coil. The alternating current flowing through the coil generates an alternating magnetic field that passes through the workpiece, inducing eddy currents in the workpiece for heating.

[0004] However, current electromagnetic induction heating is mainly medium- and high-frequency AC induction heating, which uses the principle of electromagnetic induction to generate induced current in aluminum rods for heating. However, medium and high frequencies have obvious skin effect, resulting in low heat penetration depth. The induced eddy currents are mainly concentrated in the outer layer of the metal. For aluminum rods with larger diameters, the skin effect is more obvious, causing poor heating uniformity. Utility Model Content

[0005] Therefore, in view of the above problems, this utility model provides a permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion, which mainly solves the problem of poor heating uniformity of aluminum rod heating devices in the prior art.

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

[0007] A permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion includes a frame, a power supply system, a control system, a conveying mechanism, a pushing mechanism, and a heating mechanism. The conveying mechanism is mounted on the frame and is used for conveying the aluminum rods. The conveying direction of the conveying mechanism is defined as the longitudinal direction, and the width direction of the conveying mechanism is defined as the transverse direction.

[0008] The heating mechanism is mounted on a frame and has a conveying channel through which the conveying mechanism passes. The heating mechanism includes a housing and at least three permanent magnet assemblies. Each permanent magnet assembly has a through hole at its central axis. The permanent magnet assemblies are arranged sequentially along the longitudinal direction. The central axis of the through hole of each permanent magnet assembly coincides with the central axis of the conveying channel. Each permanent magnet assembly includes 6 to 8 permanent magnet units arranged in a ring array. An electromagnet is embedded between two adjacent permanent magnet units on the same permanent magnet assembly.

[0009] The power system includes a main power supply and multiple sub-power supplies. Each sub-power supply is electrically connected to a specific electromagnet. The pushing mechanism is mounted on the frame and is used to push aluminum bars into or out of the conveying channel. The power system, conveying mechanism, pushing mechanism, and heating mechanism are electrically connected to the control system.

[0010] Furthermore, each of the permanent magnet units includes multiple permanent magnets with an arc-shaped structure. The permanent magnets are arranged sequentially along the radial direction of the conveying channel, and the spacing between adjacent permanent magnets on the same permanent magnet unit gradually increases from the inner layer to the outer layer.

[0011] Furthermore, the permanent magnet is a neodymium iron boron magnet.

[0012] Furthermore, each of the electromagnets is connected to a first linear drive assembly for driving the electromagnet to move along the radial direction of the conveying channel, and each of the first linear drive assemblies is electrically connected to the control system.

[0013] Furthermore, the permanent magnet units on each of the permanent magnet components and located on a straight line parallel to the central axis of the conveying channel are connected by a connecting frame. A second linear drive component is connected to the connecting frame for synchronously driving the permanent magnet units located on a straight line parallel to the central axis of the conveying channel to move synchronously along the radial direction of the conveying channel. Each of the second linear drive components is electrically connected to the control system.

[0014] Furthermore, the permanent magnet assembly includes eight permanent magnet units arranged in a ring array, which are arranged in a clockwise direction as a first permanent magnet unit, a second permanent magnet unit, a third permanent magnet unit, a fourth permanent magnet unit, a fifth permanent magnet unit, a sixth permanent magnet unit, a seventh permanent magnet unit, and an eighth permanent magnet unit. The first permanent magnet unit is magnetized radially outward, the second permanent magnet unit is magnetized tangentially clockwise, the third permanent magnet unit is magnetized tangentially clockwise, the fourth permanent magnet unit is magnetized tangentially clockwise, the fifth permanent magnet unit is magnetized radially inward, the sixth permanent magnet unit is magnetized tangentially counterclockwise, the seventh permanent magnet unit is magnetized tangentially counterclockwise, and the eighth permanent magnet unit is magnetized tangentially counterclockwise.

[0015] Furthermore, the conveying mechanism includes a first roller conveyor assembly, a second roller conveyor assembly, and a support assembly. The first roller conveyor assembly and the second roller conveyor assembly are distributed at both ends of the heating mechanism in the longitudinal direction, and the support assembly is distributed in the conveying channel and along the longitudinal direction of the conveying channel.

[0016] Furthermore, the support assembly includes two support rails, each with a strip-shaped groove containing a ball bearing. The strip-shaped groove is covered by an upper pressure plate, which has through slots spaced apart for the upper protrusions of the ball bearings.

[0017] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion combines the gradient magnetic field formed by the alternating polarity arrangement of permanent magnets in the permanent magnet assembly with the high-frequency alternating magnetic field generated by the alternating current to generate high-density eddy currents on the surface of the aluminum rod, thereby achieving efficient, uniform, and rapid heating. That is, multiple sets of permanent magnet units are arranged around the aluminum rod, and a controllable rotating magnetic field is formed by adjusting the polarity distribution of the permanent magnets and the frequency of the alternating current. Attached Figure Description

[0018] Figure 1 This is a top view of an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of the heating mechanism in an embodiment of this utility model;

[0020] Figure 3 This is a right-side view of the permanent magnet assembly in an embodiment of this utility model.

[0021] Figure 4 This is a schematic diagram of the magnetization direction structure of the permanent magnet unit in an embodiment of this utility model;

[0022] Figure 5 This is a cross-sectional view of the support component in an embodiment of this utility model;

[0023] Figure 6 This is a schematic diagram of the electrical connection structure between the power supply system and the electromagnet in an embodiment of this utility model;

[0024] Figure 7 This is a circuit module diagram of an embodiment of the present utility model. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] The embodiment of this utility model is as follows:

[0027] refer to Figures 1 to 7As shown, a method for permanent magnet induction heating of aluminum rods for aluminum alloy profile extrusion includes the following steps:

[0028] a. The aluminum rod is placed on the conveying mechanism 3 for conveying, and then pushed into the conveying channel 51 of the heating mechanism 5 by the pushing mechanism 4, so that the aluminum rod is placed in the composite magnetic field generated by the permanent magnet component 53. The magnetic field strength of the composite magnetic field is 0.5 to 2T, preferably 1.8T.

[0029] b. A gradient magnetic field is formed by the alternating polarity arrangement of the permanent magnets 6 in the permanent magnet assembly 53. Simultaneously, the electromagnet 55 generates a high-frequency alternating magnetic field through alternating current. Eddy currents are excited on the surface of the aluminum rod using the magnetic field coupling effect, achieving conductive heating from the outside in. The frequency of the alternating current is adjustable from 1 to 20 kHz, and the power density is controlled to be 50-200 W / cm². 2 Furthermore, the electromagnet 55 is independently controlled by the sub-power supply 12 of the power supply system 1, and local magnetic field compensation is achieved through independent current control, with a compensation range of ±0.3T.

[0030] c. The temperature of the aluminum rod is detected by the infrared temperature sensor 10 and fed back to the control system 2. The distance between the permanent magnet unit 100 and the aluminum rod is dynamically adjusted. The adjustment distance between the permanent magnet unit 100 and the aluminum rod is 0.5-5mm. The diameter of the aluminum rod is defined as D, and the distance between the permanent magnet unit and the aluminum rod is defined as d, where d = 0.02D + 0.5mm. This ensures that the magnetic field penetration depth matches the diameter of the aluminum rod. When the temperature difference ΔT > 5℃, the spacing of the permanent magnet unit 100 in the low-temperature region is increased to reduce the local heating rate. When the overall heating rate is insufficient, the alternating current frequency is increased to 15-20kHz to reduce the skin depth and increase the surface eddy current density.

[0031] The aforementioned heating method combines the gradient magnetic field formed by the alternating polarity arrangement of permanent magnets 6 in the permanent magnet assembly 53 with the high-frequency alternating magnetic field generated by the alternating current, thereby generating high-density eddy currents on the surface of the aluminum rod. This achieves efficient, uniform, and rapid heating. Specifically, multiple sets of permanent magnet units 100 are arranged circumferentially on the aluminum rod. By adjusting the polarity distribution of the permanent magnets 6 and the frequency of the alternating current, a controllable rotating magnetic field is formed. Combined with a temperature feedback system, the magnetic field parameters are dynamically optimized to ensure the consistency of the axial and radial temperatures of the aluminum rod. Compared with traditional resistance / gas heating, this heating method reduces energy consumption by more than 30%, increases the heating rate by 2 to 3 times, and produces no pollution emissions, making it suitable for high-precision extrusion forming processes.

[0032] A permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion includes a frame, a power supply system 1, a control system 2, a conveying mechanism 3, a pushing mechanism 4, and a heating mechanism 5. The conveying mechanism 3 is mounted on the frame and is used for conveying aluminum rods. The direction of the conveying mechanism 3 is defined as the longitudinal direction, and the direction of the conveying mechanism 3 is defined as the transverse direction.

[0033] The heating mechanism 5 is mounted on a frame and has a conveying channel 51 through which the conveying mechanism 3 passes. The heating mechanism 5 includes a housing 52 and three permanent magnet assemblies 53. Each permanent magnet assembly 53 has a through hole 54 at its central axis. The permanent magnet assemblies 53 are arranged sequentially along the longitudinal direction. The central axis of the through hole 54 of each permanent magnet assembly 53 coincides with the central axis of the conveying channel 51. Each permanent magnet assembly 53 includes 6 to 8 permanent magnet units 100 arranged in a ring array, preferably 8. An electromagnet 55 is embedded between two adjacent permanent magnet units 100 on the same permanent magnet assembly 53.

[0034] The power system 1 includes a main power supply 11 and multiple sub-power supplies 12. Each sub-power supply 2 is electrically connected to a specific electromagnet 55. The pushing mechanism 4 is mounted on the frame and is used to push aluminum bars into or out of the conveying channel 51. The power system 1, the conveying mechanism 3, the pushing mechanism 4, and the heating mechanism 5 are electrically connected to the control system 2.

[0035] Furthermore, each of the permanent magnet units 100 includes a plurality of permanent magnets 6 with an arc-shaped structure. Each of the permanent magnets 6 is arranged sequentially along the radial direction of the conveying channel 51. The spacing between adjacent permanent magnets 6 on the same permanent magnet unit 100 gradually increases from the inner layer to the outer layer. The permanent magnets 6 are neodymium iron boron magnets.

[0036] Meanwhile, each of the electromagnets 55 is connected to a first linear drive assembly 7, which is used to drive the electromagnet 5 to move in the radial direction of the conveying channel 51. Each of the first linear drive assemblies 7 is electrically connected to the control system 2, thereby adjusting the distance between the electromagnet 55 and the aluminum rod to achieve local magnetic field compensation.

[0037] Furthermore, the permanent magnet units 100 on each of the permanent magnet components 53 and located on a straight line parallel to the central axis of the conveying channel 51 are connected by a connecting frame 8. A second linear drive component 9 is connected to the connecting frame 8 to synchronously drive the permanent magnet units 100 located on a straight line parallel to the central axis of the conveying channel 51 to move synchronously in the radial direction of the conveying channel 51. Each of the second linear drive components 9 is electrically connected to the control system 2 to dynamically adjust the distance between the permanent magnet unit 100 and the aluminum rod, ensuring that the magnetic field penetration depth matches the diameter of the aluminum rod, thereby reducing the local heating rate.

[0038] In this embodiment, the permanent magnet assembly 53 includes eight permanent magnet units 100 arranged in a ring array, which are arranged in a clockwise direction as follows: first permanent magnet unit 101, second permanent magnet unit 102, third permanent magnet unit 103, fourth permanent magnet unit 104, fifth permanent magnet unit 105, sixth permanent magnet unit 106, seventh permanent magnet unit 107, and eighth permanent magnet unit 108. The first permanent magnet unit 101 is magnetized radially outward, the second permanent magnet unit 102 is magnetized tangentially clockwise, the third permanent magnet unit 103 is magnetized tangentially clockwise, the fourth permanent magnet unit 104 is magnetized tangentially clockwise, the fifth permanent magnet unit 105 is magnetized radially inward, the sixth permanent magnet unit 106 is magnetized tangentially counterclockwise, the seventh permanent magnet unit 107 is magnetized tangentially counterclockwise, and the eighth permanent magnet unit 108 is magnetized tangentially counterclockwise. The alternating arrangement of the permanent magnet units 100 of the permanent magnet assembly 53 forms a gradient magnetic field.

[0039] Furthermore, the conveying mechanism 3 includes a first roller conveyor assembly 31, a second roller conveyor assembly 32, and a support assembly 33. The first roller conveyor assembly 31 and the second roller conveyor assembly 32 are distributed at both ends of the longitudinal direction of the heating mechanism 5. The support assembly 33 is distributed within the conveying channel 51 and along the longitudinal direction of the conveying channel 51. The support assembly 33 includes two support rails 331. The support rails 331 are provided with strip-shaped grooves 332. The strip-shaped grooves 332 are provided with balls 333. The strip-shaped grooves 332 are covered with an upper pressure plate 334. The upper pressure plate 334 is provided with through grooves 335 at intervals for the upper protrusions of the balls 333, thereby improving the stability of the aluminum rod conveying.

[0040] 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0042] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion, characterized in that: It includes a frame, a power system, a control system, a conveying mechanism, a pushing mechanism, and a heating mechanism. The conveying mechanism is mounted on the frame and is used for conveying aluminum bars. The direction of the conveying mechanism is defined as the longitudinal direction, and the direction of the conveying mechanism is defined as the transverse direction. The heating mechanism is mounted on a frame and has a conveying channel through which the conveying mechanism passes. The heating mechanism includes a housing and at least three permanent magnet assemblies. Each permanent magnet assembly has a through hole at its central axis. The permanent magnet assemblies are arranged sequentially along the longitudinal direction. The central axis of the through hole of each permanent magnet assembly coincides with the central axis of the conveying channel. Each permanent magnet assembly includes 6 to 8 permanent magnet units arranged in a ring array. An electromagnet is embedded between two adjacent permanent magnet units on the same permanent magnet assembly. The power system includes a main power supply and multiple sub-power supplies. Each sub-power supply is electrically connected to a specific electromagnet. The pushing mechanism is mounted on the frame and is used to push aluminum bars into or out of the conveying channel. The power system, conveying mechanism, pushing mechanism, and heating mechanism are electrically connected to the control system.

2. The permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion according to claim 1, characterized in that: Each of the permanent magnet units includes multiple permanent magnets with an arc-shaped structure. The permanent magnets are arranged sequentially along the radial direction of the conveying channel, and the spacing between adjacent permanent magnets on the same permanent magnet unit gradually increases from the inner layer to the outer layer.

3. The permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion according to claim 2, characterized in that: The permanent magnet is a neodymium iron boron magnet.

4. The permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion according to claim 1, characterized in that: Each of the electromagnets is connected to a first linear drive assembly for driving the electromagnet to move along the radial direction of the conveying channel. Each of the first linear drive assemblies is electrically connected to the control system.

5. The permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion according to claim 1, characterized in that: The permanent magnet units on each of the permanent magnet assemblies and located on a straight line parallel to the central axis of the conveying channel are connected by a connecting frame. A second linear drive assembly is connected to the connecting frame for synchronously driving the permanent magnet units located on a straight line parallel to the central axis of the conveying channel to move synchronously in the radial direction of the conveying channel. Each of the second linear drive assemblies is electrically connected to the control system.

6. The permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion according to claim 5, characterized in that: The permanent magnet assembly includes eight permanent magnet units arranged in a ring array, which are arranged in a clockwise direction as follows: first permanent magnet unit, second permanent magnet unit, third permanent magnet unit, fourth permanent magnet unit, fifth permanent magnet unit, sixth permanent magnet unit, seventh permanent magnet unit, and eighth permanent magnet unit. The first permanent magnet unit is magnetized radially outward, the second permanent magnet unit is magnetized tangentially clockwise, the third permanent magnet unit is magnetized tangentially clockwise, the fourth permanent magnet unit is magnetized tangentially clockwise, the fifth permanent magnet unit is magnetized radially inward, the sixth permanent magnet unit is magnetized tangentially counterclockwise, the seventh permanent magnet unit is magnetized tangentially counterclockwise, and the eighth permanent magnet unit is magnetized tangentially counterclockwise.

7. The permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion according to claim 1, characterized in that: The conveying mechanism includes a first roller conveyor assembly, a second roller conveyor assembly, and a support assembly. The first roller conveyor assembly and the second roller conveyor assembly are distributed at both ends of the longitudinal direction of the heating mechanism, and the support assembly is distributed within the conveying channel and along the longitudinal direction of the conveying channel.

8. The permanent magnet induction heating device for aluminum rods used in aluminum alloy profile extrusion according to claim 7, characterized in that: The support assembly includes two support rails, each with a strip-shaped groove containing a ball bearing. The groove is covered by an upper pressure plate, which has through slots spaced apart to allow the ball bearing to protrude upwards.

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