A wedge-shaped induction heating head

Abstract

The present invention discloses a wedge-shaped induction heating head, which includes a first heating knife, a second heating knife and a connecting portion; the first heating knife and the second heating knife are parallel to each other, the connecting portion is arranged on one side of the first heating knife and the second heating knife, and is used to connect and conduct the two, one end of the first heating knife away from the connecting portion is open to one output end of an external alternating power supply, and the other end of the second heating knife is open to the other output end of the external alternating power supply; the first heating knife and the second heating knife are close to each other, and a gap is left between the two to accommodate induction heating of an external workpiece. Compared with the prior art, the technical solution provided by the present application can effectively narrow the spatial distribution of the alternating magnetic field during the induction heating process, adapt to the thermal processing requirements of welding small-volume components on the surface of the profile, and adapt to scenes such as welding of small-volume components on circuit boards or other profiles with larger formats.

Description

Technical Field

[0001] The invention belongs to the technical field of induction heating, and in particular relates to an induction heating head. Background Art

[0002] When induction heating technology is applied to specific metal heat treatment processing scenarios, an induction heating head needs to be set up corresponding to the specific processing scenarios. The induction heating head is often used as a magnetic field generator. When an alternating current with a certain frequency is input into it, the induction heating head can convert the alternating current into an alternating magnetic field with a corresponding alternating frequency, and perform induction heating on the metal workpiece entering the magnetic field.

[0003] To ensure the induction heating effect, the induction heating head should be coiled by a metal wire with a certain enclosed area. The induction heating head provided in the prior art is often in the shape of a single-turn ring or a multi-turn spring. For example, a high-frequency electromagnetic induction focusing welding device is provided in the Chinese patent application document with application number "202110320429.9", in which the hollow induction coil is in the shape of a single-turn ring; and the 620kW coal mining machine rotor cage bar and end ring medium-frequency welding induction coil structure disclosed in the Chinese patent application document with application number "201420712705.1", the induction coil involved is in the shape of a spiral coiled with 3 turns.

[0004] The above-mentioned induction heads in the form of single-circle rings and multi-circle springs are widely used in the field of induction heating technology, and can be applied to most induction heating occasions to meet the needs of induction heating processing of ordinary metal workpieces. However, in the actual processing and production process, there are often scenarios where circuit boards, display screens or other profiles with large formats are welded to small-volume components. Taking LED display screens as an example, in the manufacturing process of Mini LED display screens or Micro LED display screens, it is necessary to weld a single extremely small LED light source to a substrate. Since the display screen itself has a larger format than a single LED light source, thousands of LED light sources are arranged on it according to display requirements. In such a scenario, the single LED light source as the target component is small in size, and the pins that need to be welded are even smaller in size. For Mini LED display screens or Micro LED display screens composed of multiple single LED light sources neatly arranged, they will also face technical difficulties such as many soldering points, precise position requirements for individual soldering points, a large number of overall required soldering points, and a wide distribution range of different soldering points.

[0005] The above problems are common in actual production. When induction heating technology is applied to the above processing scenarios, for the induction head in the form of a single-turn ring or a multi-turn spring, after the alternating current is passed through it, the magnetic field generated by it is often evenly distributed in the space around the induction heating head itself, and often appears in the form of an oblate spherical, spherical or ellipsoidal shape with the induction heating head as the center. Such a magnetic field distribution cannot meet the above-mentioned scenario requirements for welding small-volume components on circuit boards, display screens or other large-format profiles.

[0006] To sum up, how to improve the induction heating head in the prior art so that it can be suitable for the thermal processing requirements of welding small-volume components on the surface of profiles and overcome the practical difficulties of small single welds, large number of welds and wide distribution range between different welds in similar scenarios is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0007] In order to solve the above problems, the purpose of the present invention is to provide a wedge-shaped induction heating head, which narrows the alternating magnetic field with its own structural characteristics and concentrates the alternating magnetic field within a narrower range, so as to facilitate adaptation to the welding scenarios of small-volume components.

[0008] Another object of the present invention is to provide a wedge-shaped induction heating head with a simple structure, stable operation and good heating effect.

[0009] To achieve the above object, the technical solution of the present invention is as follows:

[0010] A wedge-shaped induction heating head, which includes a first heating knife, a second heating knife and a connecting portion; the first heating knife and the second heating knife are parallel to each other, the connecting portion is arranged on one side of the first heating knife and the second heating knife, and is used to connect and conduct the two, one end of the first heating knife away from the connecting portion is open to one output end of an external alternating current power supply, and the other end of the second heating knife is open to the other output end of the external alternating current power supply; the first heating knife and the second heating knife are close to each other, and a gap is left between the two to allow induction heating of an external workpiece.

[0011] In the induction heating head, the first heating blade and the second heating blade are connected and turned on through a connecting part, and then one end of the first heating blade is connected to the current output by an external alternating current power supply, and the current will flow along the path of the first heating blade, the connecting part, the second heating blade to the external alternating current power supply. Since the first heating blade and the second heating blade are in parallel, for the induction heating head, at any time during its operation, the currents flowing in the first heating blade and the second heating blade are equal in magnitude and opposite in direction. Since there is a proximity effect in the transmission process of the alternating current, the two currents flowing in opposite directions interact with each other, and the current will tend to flow along the shortest path. In the induction heating head, the current in the first heating blade will tend to flow along the side close to the second heating blade, and the current in the second heating blade will also tend to flow along the side close to the first heating blade. The current flows on one side of the hot knife. From the overall point of view, it is not difficult to find that when alternating current is applied to the induction heating head, the alternating current will tend to flow to the area near the gap retained between the first heating knife and the second heating knife. The higher the frequency of the alternating current, the more obvious this phenomenon is. In this way, the alternating magnetic field converted from the alternating current will also be concentrated near the gap, that is, the alternating magnetic field generated at the induction heating head is restricted by the two heating knives close to each other, and is artificially narrowed around the gap. The technicians can design a reasonable gap shape and gap width according to the shape and size of the area for single heat treatment according to specific needs, and obtain a narrow spatial magnetic field corresponding to the gap, which is suitable for small components during specific processing and can perform more precise induction heating welding processing on small components.

[0012] Furthermore, the first heating knife includes a first main edge and a first auxiliary edge, which together form the blade of the first heating knife; the second heating knife includes a second main edge and a second auxiliary edge, which together form the blade of the second heating knife; the blade of the first heating knife is close to the blade of the second heating knife, and a gap is left between the two blades to allow for induction heating of an external workpiece.

[0013] Furthermore, the angle between the first main cutting edge and the first auxiliary cutting edge is an acute angle; the angle between the second main cutting edge and the second auxiliary cutting edge is also an acute angle.

[0014] The blade formed by the first main edge and the first auxiliary edge presents an acute angle, and the blade of the first heating knife will be thin and flat. The same is true for the blade of the second heating knife. When the blades of the first heating knife and the second heating knife are close to each other, the alternating current is affected by the proximity effect and gradually converges on the blades of the two heating knives, and further generates a corresponding alternating magnetic field in the space near the blades. The alternating magnetic field will be obviously concentrated near the gap between the two blades. The higher the frequency of the alternating current and the sharper the two blades, the more obvious this phenomenon is, and the more the alternating magnetic field is concentrated. The range of the alternating magnetic field is taken as the effective processing area. Such an induction heating head design will be able to effectively narrow the effective processing area, help improve the accuracy of single induction heating processing, and adapt to the welding processing of small-volume components.

[0015] In specific applications, technicians can design different gap shapes to adapt to specific processing requirements. For example, shorter first heating knife and second heating knife can be designed to keep the gap width between the first heating knife and the second heating knife relatively wide, which can be used to weld larger chips based on induction heating technology. Longer first heating knife and second heating knife can also be designed to keep the gap width between the first heating knife and the second heating knife relatively narrow, which can be used to adapt to the processing scenario of array welding of massive single LED light sources on the surface of Mini LED display or Micro LED display.

[0016] Furthermore, the first heating knife also includes a first back edge, which together with the first main edge form the back of the first heating knife; the second heating knife also includes a second back edge, which together with the second main edge form the back of the second heating knife; the angle between the first back edge and the first main edge is a right angle or an obtuse angle; the angle between the second back edge and the second main edge is also a right angle or an obtuse angle.

[0017] With the above-mentioned arrangement, the entire cross-section of the first heating knife and the second heating knife will be constructed into a shape with a wide and thick back and a thin and flat blade. On the one hand, such an arrangement is convenient for enhancing the influence of the proximity effect on the transmission of alternating current, prompting the alternating current to converge at the blades of the two heating knives, and obtaining a more concentrated and stronger alternating magnetic field near the gap. On the other hand, it also fully considers the current-carrying characteristics of the first heating knife and the second heating knife themselves, and with the structural characteristics of gradually becoming wider and thicker from the blade to the back of the knife, the ability of the two heating knives to withstand high-frequency and large currents is improved, their service life is extended, and the induction heating head is guaranteed to work stably for a long time.

[0018] From the cross-section, it is not difficult to find that the two heating knives are in a shape with the backs of the two heating knives far apart and the blades close to each other in space. A wider space will be left between the backs of the two heating knives. On the one hand, such a shape is conducive to the smooth progress of the induction heating process. On the other hand, it can leave an empty groove between the two heating knives to facilitate heat dissipation. It is also convenient for technicians to fill the empty groove with insulating materials if necessary to prevent mutual discharge between the two.

[0019] In the technical solution provided in the present application, the induction heating head also includes a support seat, which is arranged on the back side of the first heating knife and the second heating knife, and the support seat is integrally connected to the first heating knife, the connecting part and the second heating knife respectively.

[0020] The support seat is used to connect the entire induction heating head with an external mechanism. The support seat is set at the back of the first heating knife and the second heating knife. When observed from the cross section, the back of the knife presenting an obtuse angle will be connected to the support seat, and the blades of the first heating knife and the second heating knife will extend outward away from the support seat. After the induction heating head is connected to the external driving device through the support seat, the first heating knife and the second heating knife will extend outward. At this time, the profiles and components to be processed are placed under the blades. The blades of the first heating knife and the second heating knife will be closer to the profiles, and the magnetic field generated near the blades can better cover the processing position, thereby achieving a more ideal induction heating welding effect.

[0021] Furthermore, the support base includes a support base body and a water cooling pipe, and the water cooling pipe is arranged inside the support base body. When an alternating current is applied to the induction heating head, due to the proximity effect of the alternating current described above, the current will be concentrated near the blades of the first heating knife and the second heating knife. At this time, although the backs of the first heating knife and the second heating knife are also conductors, there is little or no current flowing inside them. Therefore, in a high-frequency and high-current environment, the backs of the first heating knife and the second heating knife do not undertake the task of conducting electricity, but only act as a heat conduction medium with its good thermal conductivity. After the heat generated by the blade during operation is conducted, it is gradually transferred to the water cooling pipe in the support base, and the heat is dissipated through the cooling water flowing in the water cooling pipe, providing timely, efficient and continuous heat dissipation measures for the entire induction heating head, ensuring that the induction heating head works stably for a long time without burning.

[0022] The advantages of the present invention are as follows: compared with the prior art, the technical solution provided by the present application can effectively narrow the spatial distribution of the alternating magnetic field during induction heating, adapt to the thermal processing requirements of welding small-volume components on the surface of profiles, and adapt to scenarios such as welding of small-volume components on circuit boards or other profiles with larger formats. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the wedge-shaped induction heating head provided in a specific implementation manner from a first viewing angle.

[0024] Figure 2 It is a schematic diagram of the overall structure of the wedge-shaped induction heating head provided in the specific implementation manner from a second viewing angle.

[0025] Figure 3It is a first partial cross-sectional view of a wedge-shaped induction heating head provided in a specific embodiment.

[0026] Figure 4 It is a second partial cross-sectional view of the wedge-shaped induction heating head provided in the specific embodiment. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] To achieve the above object, the technical solution of the present invention is as follows:

[0029] See also Figure 1-4 .

[0030] In this specific embodiment, a wedge-shaped induction heating head is provided, which includes a first heating blade 1 and a second heating blade 2, and the first heating blade 1 and the second heating blade 2 are electrically connected;

[0031] Among them, the first heating knife 1 includes a first main edge 11, a first auxiliary edge 12 and a first back edge (not shown in the figure), the first main edge 11 and the first auxiliary edge 12 together form the blade part 1x of the first heating knife 1, the first main edge 11, the first auxiliary edge 12 and the first back edge together form the blade back part 1y of the first heating knife 1; the first main edge 11, the first auxiliary edge 12 and the first back edge together form a triangle, and the overall structure of the first heating knife 1 is a wedge-shaped.

[0032] The second heating knife 2 includes a second main edge 21, a second auxiliary edge 22 and a second back edge (not shown). The second main edge 21 and the second auxiliary edge 22 together form the blade portion 2x of the second heating knife 2. The second main edge 21, the second auxiliary edge 22 and the second back edge together form the back portion 2y of the second heating knife 2. The second main edge 21, the second auxiliary edge 22 and the second back edge together form a triangle, and the overall structure of the second heating knife 2 is a wedge-shaped structure.

[0033] The first heating knife 1 and the second heating knife 2 are parallel to each other, the blade 1x of the first heating knife 1 is close to the blade 2x of the second heating knife 2, and a gap A of 3mm-8mm is left between the two for induction heating processing.

[0034] Furthermore, in the present specific embodiment, the first heating knife 1 and the second heating knife 2 are both wedge-shaped, and the cross-section of the first heating knife 1 and the cross-section of the second heating knife 2 are both similar triangles.

[0035] Furthermore, in the present specific embodiment, the cross-section of the second heating knife 2 is a triangle with an acute angle of 15°-30° at the blade 2x and an obtuse angle of 120°-150° at the blade back 2y.

[0036] Furthermore, in the present specific embodiment, the induction heating head also includes a connecting portion 3, which is arranged between the first heating knife 1 and the second heating knife 2, and the connecting portion 3 is integrally connected to the first heating knife 1 and the second heating knife 2 respectively and maintains electrical conductivity; one end of the first heating knife 1 away from the connecting portion 3 and one end of the second heating knife 2 away from the connecting portion 3 are open to an external alternating current power supply.

[0037] Furthermore, in this specific embodiment, the induction heating head also includes a support seat 4, which is arranged on one side of the blade back (1y / 2y) of the first heating knife 1 and the second heating knife 2, and the support seat 4 is integrally connected to the first heating knife 1, the second heating knife 1 and the connecting part 3 respectively.

[0038] Furthermore, in this specific embodiment, the support seat 4 includes a support seat body 41 and a water cooling pipe 42 , and the water cooling pipe 42 is opened inside the support seat body 41 .

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wedge-shaped induction heating head, characterized in that: The induction heating head comprises a first heating blade, a second heating blade and a connecting portion; The first heating knife and the second heating knife are parallel to each other, the connecting portion is arranged on one side of the first heating knife and the second heating knife, and is used to connect and conduct the two, one end of the first heating knife away from the connecting portion is openly connected to one output end of the external alternating power supply, and the other end of the second heating knife is openly connected to the other output end of the external alternating power supply; the first heating knife and the second heating knife are close to each other, and a gap is reserved between the two to allow induction heating of an external workpiece; The first heating knife comprises a first main edge and a first auxiliary edge, and the first main edge and the first auxiliary edge together form a blade of the first heating knife; The second heating knife comprises a second main edge and a second auxiliary edge, and the second main edge and the second auxiliary edge together form a blade of the second heating knife; The blade of the first heating knife is close to the blade of the second heating knife, and a gap is left between the two blades to allow induction heating of an external workpiece; The angle between the first main edge and the first auxiliary edge is an acute angle; the angle between the second main edge and the second auxiliary edge is also an acute angle.

2. The wedge-shaped induction heating head according to claim 1, characterized in that: The first heating knife further comprises a first back edge, and the first back edge and the first main edge together form the back of the first heating knife; the second heating knife further comprises a second back edge, and the second back edge and the second main edge together form the back of the second heating knife; The angle between the first back edge and the first main edge is a right angle or an obtuse angle; the angle between the second back edge and the second main edge is also a right angle or an obtuse angle.

3. The wedge-shaped induction heating head according to claim 2, characterized in that: The induction heating head also includes a support base, which is arranged on one side of the back of the first heating knife and the second heating knife, and the support base is respectively connected to the first heating knife, the connecting part and the second heating knife in an integrally formed manner.

4. The wedge-shaped induction heating head according to claim 3, characterized in that: The support seat includes a support seat body and a water cooling pipe, and the water cooling pipe is arranged in the support seat body.

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