A magnetic stripe rack and rice cooker

Abstract

The application discloses a magnetic stripe frame and a rice cooker. The magnetic stripe frame comprises a frame body, a magnetic stripe and a positioning assembly. The magnetic stripe is arranged on the frame body and can slide along a preset direction of the frame body. The positioning assembly is assembled on the frame body and can cooperate with the magnetic stripe after sliding to limit the sliding of the magnetic stripe. The position of the magnetic stripe on the frame body is adjusted and positioned by the positioning assembly, so that the magnetic stripe can cover the electromagnetic coils on the wire coil at different positions. When the position of the wire coil or the distribution of the electromagnetic coil changes, the magnetic stripe only needs to slide along the preset direction of the frame body, the magnetic stripe is adjusted to a position capable of completely covering the new electromagnetic coil, and the sliding of the magnetic stripe is limited through the cooperation of the positioning assembly and the magnetic stripe. Therefore, the adaptation of the new wire coil can be realized, the need of redesigning the magnetic stripe frame and opening and manufacturing a new mold when the wire coil changes is avoided, the cost of mold purchase and manufacturing is greatly reduced, the step of redeveloping the magnetic stripe frame is saved, and the research and development cycle of the product is significantly shortened.

Description

Technical Field

[0001] This invention relates to the field of rice cooker technology, and in particular to a magnetic strip holder and a rice cooker. Background Technology

[0002] The heating system of an IH rice cooker includes a winding reel, an electromagnetic coil wound on the ribs of the reel, and a magnetic strip holder to support the magnetic strip. The magnetic strip is fixed to the side of the reel by the magnetic strip holder, which can concentrate the magnetic field of the electromagnetic coil during operation, reducing magnetic field loss and improving the overall thermal efficiency of the machine. In existing technology, the magnetic strip holder generally adopts a design that mimics the shape of the winding reel, that is, the size and outline of the magnetic strip holder perfectly match the winding reel it is adapted to; however, IH rice cookers need to be designed with various capacity specifications according to market demand, and different capacities correspond to different sizes of winding reels (the larger the capacity, the larger the coverage area of ​​the winding reel and electromagnetic coil is usually). When the size of the winding reel changes, the position of the magnetic strip on the original magnetic strip holder is fixed and cannot cover the electromagnetic coil on the new winding reel, such as... Figure 10 As shown, this rendered the original magnetic strip holder unusable. To adapt it to the new winding reel, the magnetic strip holder structure needed to be redesigned and a new mold needed to be made, which not only increased the mold cost but also extended the research and development cycle. Summary of the Invention

[0003] The embodiments of the present invention provide a magnetic strip holder and a rice cooker, which solves the technical problems of low versatility caused by the conformal design of the magnetic strip holder and the winding coil in the existing IH rice cooker, and the high product development cost caused by the need to open new molds when the size of the winding coil changes.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a magnetic strip holder, the magnetic strip holder including a frame, a magnetic strip, and a positioning component. The magnetic strip is disposed on the frame and can slide along a preset direction of the frame. The positioning component is assembled on the frame and can cooperate with the slidable magnetic strip to restrict the sliding of the magnetic strip. The position of the magnetic strip on the frame is adjusted and positioned by the positioning component, so that the magnetic strip can cover the electromagnetic coils on the winding reels at different positions.

[0005] In some embodiments, the positioning component includes a latch body and a fixed shaft. The fixed shaft passes through the latch body along a direction perpendicular to the extension of the latch body, and both ends of the fixed shaft extend out of the latch body. The side of the frame is provided with shaft holes adapted to the fixed shaft. Both ends of the fixed shaft are respectively inserted into the corresponding shaft holes so that the positioning component can rotate around the axis of the fixed shaft.

[0006] In some embodiments, the two ends of the latch body are respectively provided with a first slot and a second slot. When the positioning component is rotated to the first position, the tail of the magnetic strip is embedded in the first slot, and when the positioning component is rotated to the second position, the tail of the magnetic strip is embedded in the second slot.

[0007] In some embodiments, the latch body is provided with an anti-rotation post; when the magnetic strip is embedded in the first slot, the end face of the anti-rotation post abuts against the side of the magnetic strip to restrict the rotation of the positioning component; when the magnetic strip is embedded in the second slot, the bottom surface of the latch body fits against the side surface of the frame to restrict the rotation of the positioning component.

[0008] In some embodiments, the frame is provided with a sliding track for guiding the magnetic strip to slide in a preset direction, the magnetic strip is embedded in the sliding track, and the outer wall of the magnetic strip is in contact with the groove wall of the sliding track.

[0009] In some embodiments, the frame is provided with a magnetic strip clamping buckle. One end of the magnetic strip clamping buckle is fixedly connected to the top of the frame, and the other end extends in the direction of the magnetic strip, with the end face of the extended end abutting against the top surface of the magnetic strip, for pressing the magnetic strip into the sliding track of the frame.

[0010] In some embodiments, a silicone adhesive layer is provided around the mounting surface of the magnetic strip and the frame.

[0011] In some embodiments, the tail of the frame is provided with a limiting part, which is a protrusion structure protruding from the end of the sliding track; when the positioning component is removed from the frame, when the magnetic strip slides along the sliding track to the tail, the end of the magnetic strip abuts against the end face of the limiting part to limit the sliding stroke of the magnetic strip.

[0012] In some embodiments, the positioning component rotates 90° from the first position to the second position. When the electromagnetic coil is wound on the ribs near the outer ring of the winding disc, the positioning component rotates to the first position and the magnetic strip covers the electromagnetic coil. When the electromagnetic coil is wound on the ribs near the inner ring of the winding disc, the positioning component rotates to the second position and the magnetic strip covers the electromagnetic coil.

[0013] According to another aspect of this application, an embodiment of the present invention provides a rice cooker, including a rice cooker body, an inner pot, a winding coil, and the aforementioned magnetic strip holder; the inner pot is assembled inside the rice cooker body, the winding coil is fixed inside the base of the rice cooker body and located below the inner pot, an electromagnetic coil is wound on the winding coil, the frame of the magnetic strip holder is fixed on the base of the rice cooker body, and the magnetic strip of the magnetic strip holder is arranged corresponding to the electromagnetic coil to concentrate the magnetic field when the electromagnetic coil is working.

[0014] In some embodiments, the frame of the magnetic strip holder is provided with a fixing ear on its edge, and a fixing hole is provided on the fixing ear; external fasteners pass through the fixing hole to fix the frame to the base.

[0015] In some embodiments, the winding reel includes a first winding reel, a second winding reel, and a third winding reel, which are selected for use. The first winding reel, the second winding reel, and the third winding reel are respectively adapted to the first inner liner, the second inner liner, and the third inner liner, and the capacity of the first inner liner, the second inner liner, and the third inner liner increases sequentially. The magnetic strip can be rotated to a first position by the positioning component to cover the electromagnetic coil on the second winding reel. The magnetic strip can be rotated to a second position by the positioning component to cover the electromagnetic coil on the first winding reel. When the positioning component is removed, the magnetic strip can slide to cover the electromagnetic coil on the third winding reel.

[0016] Compared with the prior art, the magnetic strip holder of the present invention has at least the following beneficial effects: The magnetic strip holder provided by the present invention includes a frame, a magnetic strip, and a positioning component. The magnetic strip is disposed on the frame and can slide along a preset direction of the frame. The positioning component is assembled on the frame and can cooperate with the slidable magnetic strip to limit the sliding of the magnetic strip. The position of the magnetic strip on the frame is adjusted and positioned by the positioning component so that the magnetic strip can cover the electromagnetic coils on the winding spools at different positions.

[0017] This invention solves the technical problems in the prior art through the rational design of the frame, magnetic strip, and positioning components. Firstly, unlike traditional magnetic strip frames that conform to the shape of a specific winding reel, the frame is designed as a universal support structure adaptable to various winding reels. This structure breaks the limitation of the traditional magnetic strip frame's "fixed magnetic strip position," providing a sliding base for the magnetic strip, allowing it to be flexibly adjusted according to the position of the electromagnetic coil on different winding reels. More specifically, when the position of the winding reel or the distribution of the electromagnetic coil changes, it is not necessary to replace the entire frame as in traditional solutions. The magnetic strip holder allows for easy adaptation to new winding reels simply by sliding the magnetic strip along the preset direction of the holder until it completely covers the new electromagnetic coil. The positioning component then restricts the sliding of the magnetic strip. Throughout the process, the holder and positioning component do not need to be replaced; different winding reels can be adapted simply by adjusting the position of the magnetic strip. This completely avoids the need to redesign the magnetic strip holder and create new molds when the winding reel changes. This significantly reduces the cost of mold procurement and manufacturing, eliminates the need to redevelop the magnetic strip holder, and significantly shortens the product development cycle.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a magnetic stripe holder provided in an embodiment of the present invention; Figure 2 A front view of a magnetic strip holder provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a positioning component in a magnetic stripe holder according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a positioning component in a magnetic stripe holder after rotating 90°, according to an embodiment of the present invention. Figure 5 A cross-sectional view of a rice cooker provided in an embodiment of the present invention, wherein the winding reel is a first winding reel; Figure 6 A cross-sectional view of a rice cooker provided in an embodiment of the present invention, wherein the winding reel is a second winding reel; Figure 7 A cross-sectional view of a rice cooker provided in an embodiment of the present invention, wherein the winding reel is a third winding reel; Figure 8 This is a partial exploded view of a rice cooker provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a rice cooker provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of a conventional rice cooker where the magnetic strip cannot simultaneously match the first and second winding coils. Figure label explanation: 1. Frame; 11. Shaft hole; 12. Magnetic strip clamping buckle; 13. Fixing ear; 14. Fixing hole; 2. Magnetic strip; 3. Positioning component; 31. Lock body; 32. Fixing shaft; 33. First slot; 34. Second slot; 35. Anti-rotation post; 4. Winding reel; 41. First winding reel; 42. Second winding reel; 43. Third winding reel; 5. Electromagnetic coil. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0022] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example 1 This embodiment provides a magnetic strip holder, such as Figures 1-4 As shown, the magnetic strip holder includes a frame 1, a magnetic strip 2, and a positioning component 3. The magnetic strip 2 is disposed on the frame 1 and can slide along a preset direction of the frame 1. The positioning component 3 is assembled on the frame 1 and can cooperate with the slid magnetic strip 2 to restrict the sliding of the magnetic strip 2. The position of the magnetic strip 2 on the frame 1 is adjusted and positioned by the positioning component 3 so that the magnetic strip 2 can cover the electromagnetic coils 5 on the winding reels 4 at different positions.

[0026] The frame 1 is the basic supporting component of the magnetic strip holder, usually fixed on the base of the rice cooker body and located next to the winding coil 4. This position ensures that the magnetic strip 2 can accurately align with the electromagnetic coil 5 on the winding coil 4 after subsequent adjustments. Its core function is to provide a stable sliding support surface for the magnetic strip 2, and at the same time, to provide a detachable assembly base for the positioning component 3, allowing the positioning component 3 to be stably mounted on the frame 1 to perform its fixing function. The magnetic strip 2 is directly set on the sliding support surface of the frame 1 and can slide freely along the preset direction of the frame 1. The main function of the magnetic strip 2 is to concentrate the magnetic field generated when the electromagnetic coil 5 is working, reducing the loss of the magnetic field due to outward diffusion. To improve the overall thermal efficiency of the rice cooker, more specifically, the position of the magnetic strip 2 must perfectly correspond to the electromagnetic coil 5 on the winding coil 4 in order to fully exert the magnetic focusing effect. The positioning component 3 is detachably mounted on the frame 1, and its mounting position needs to be close to the tail of the magnetic strip 2 to facilitate cooperation with the slid magnetic strip 2. Its function is to limit the magnetic strip 2 from sliding after it is adjusted to the target position by contacting it, so as to ensure that the magnetic strip 2 can be stably kept in the position covering the electromagnetic coil 5. This will heat the inner pot of the rice cooker. The position of the electromagnetic coil 5 of different winding coils 4 will be different, which is the core reason why the magnetic strip 2 needs to be able to slide and adjust.

[0027] In the specific operation, firstly, the winding reel 4 needs to be fixed in the designated position inside the rice cooker base. Then, the electromagnetic coil 5 is wound onto the ribs of the winding reel 4 according to the preset method. Next, the frame 1 is fixed to the base next to the winding reel 4, ensuring that the sliding direction of the magnetic strip 2 on the frame 1 can cover the possible position of the electromagnetic coil 5 on the winding reel 4. In the initial state, the magnetic strip 2 is placed on the frame 1. At this time, the magnetic strip 2 needs to be manually slid along the preset direction of the frame 1. During the sliding process, the correspondence between the magnetic strip 2 and the electromagnetic coil 5 is constantly observed until the coverage area of ​​the magnetic strip 2 completely includes the electromagnetic coil 5. If the positioning component 3 has not yet been assembled on the frame 1, the positioning component 3 needs to be installed on the frame 1 near the tail of the magnetic strip 2, so that the positioning component 3 and the magnetic strip 2 fit tightly together, thereby limiting the magnetic... Strip 2 continues to slide; when the rice cooker starts working, the electromagnetic coil 5 is energized and generates a magnetic field. Magnetic strip 2 immediately converges these magnetic fields, reducing magnetic field loss. The frame 1 continuously provides stable support for magnetic strip 2, preventing it from shifting due to vibration. The positioning component 3 always maintains its restraint on magnetic strip 2, ensuring it does not detach from its position covering the electromagnetic coil 5. The winding reel 4 stably supports the electromagnetic coil 5, ensuring it can continuously generate a stable magnetic field. Furthermore, when it is necessary to replace the winding reel 4 in a different position, there is no need to disassemble the positioning component 3. Simply slide magnetic strip 2 slightly to allow it to re-cover the electromagnetic coil 5 on the new winding reel 4. The positioning component 3 will then form a new fit with magnetic strip 2. The entire process requires no replacement of any parts to achieve adaptation to the new winding reel 4. Of course, other sizes of winding reels 4 can also be adapted by disassembling the positioning component 3.

[0028] This embodiment solves the technical problems in the background art through the rational design of the frame 1, magnetic strip 2, and positioning component 3. First, the frame 1 no longer conforms to the shape of a specific winding reel 4 like a traditional magnetic strip frame, but is designed as a universal support structure that can adapt to various winding reels 4. This structure breaks the limitation of the traditional magnetic strip frame's "fixed magnetic strip position" and provides a sliding base for the magnetic strip 2, allowing the magnetic strip 2 to be flexibly adjusted according to the position of the electromagnetic coil 5 on different winding reels 4. More specifically, when the position of the winding reel 4 or the distribution of the electromagnetic coil 5 changes, it is not necessary to replace the entire winding reel as in the traditional solution. The magnetic strip holder only requires sliding the magnetic strip 2 along the preset direction of the holder 1 to adjust the magnetic strip 2 to a position that can completely cover the new electromagnetic coil 5. Then, the positioning component 3 cooperates with the magnetic strip 2 to restrict the sliding of the magnetic strip 2, thus achieving the adaptation of the new winding coil 4. Throughout the process, the holder 1 and the positioning component 3 do not need to be replaced. Different winding coils 4 can be adapted simply by adjusting the position of the magnetic strip 2. This completely avoids the need to redesign the magnetic strip holder and make new molds when the winding coil 4 changes. This not only greatly reduces the cost of mold procurement and manufacturing, but also saves the step of redeveloping the magnetic strip holder, significantly shortening the product development cycle.

[0029] In a specific embodiment, such as Figure 3 and Figure 4 As shown, the positioning component 3 includes a locking body 31 and a fixing shaft 32. The fixing shaft 32 is inserted through the locking body 31 along a direction perpendicular to the extension of the locking body 31, and both ends of the fixing shaft 32 extend out of the locking body 31. The side of the frame 1 is provided with shaft holes 11 that are adapted to the fixing shaft 32. Both ends of the fixing shaft 32 are respectively inserted into the corresponding shaft holes 11 so that the positioning component 3 can rotate as a whole around the axis of the fixing shaft 32.

[0030] The locking body 31 is the core component of the positioning assembly 3. When the fixed shaft 32 is positioned perpendicular to the locking body to match the sliding position of the magnetic strip 2, the locking body 31 can be pushed by hand. Because the fixed shaft 32 is fixed in the shaft hole 11 and provides a rotation axis for the locking body 31, the locking body 31 will rotate smoothly around the axis of the fixed shaft 32. The entire positioning assembly 3 will rotate together with the rotation of the locking body 31 until it rotates to a position that can cooperate with the magnetic strip 2. The effect of this cooperative operation is very significant. On the one hand, the fitting connection between the fixed shaft 32 and the shaft hole 11 ensures the stability of the positioning component 3 during rotation. It prevents the locking body 31 from rotating and shifting due to the shaking of the fixed shaft 32 within the shaft hole 11, thus ensuring that the locking body 31 can accurately rotate to the target position and subsequently precisely cooperate with the magnetic strip 2. On the other hand, this cooperative method makes the rotation of the positioning component 3 smoother and prevents jamming. It facilitates operators to quickly adjust the position of the positioning component 3. At the same time, in the non-adjustment state, the tight connection between the fixed shaft 32 and the shaft hole 11 prevents the positioning component 3 from rotating on its own, ensuring that the limiting effect of the positioning component 3 on the magnetic strip 2 remains stable and that the magnetic strip 2 will not shift due to accidental rotation, further ensuring the coverage effect of the magnetic strip 2 on the electromagnetic coil 5.

[0031] In a specific embodiment, such as Figure 3 and Figure 4 As shown, the two ends of the latch body 31 are respectively provided with a first slot 33 and a second slot 34. When the positioning component 3 is rotated to the first position, the tail of the magnetic strip 2 is embedded in the first slot 33. When the positioning component 3 is rotated to the second position, the tail of the magnetic strip 2 is embedded in the second slot 34.

[0032] The locking body 31, as the core supporting structure of the positioning component 3, has a first slot 33 and a second slot 34 at its two ends relative to the fixed shaft 32. The opening shape of these two slots matches the shape of the tail of the magnetic strip 2, and the size of the opening is also adapted to avoid lateral wobbling after the tail of the magnetic strip 2 is inserted due to an excessively large opening, or difficulty in inserting the tail of the magnetic strip 2 due to an excessively small opening. Since the fixed shaft 32 passes through the locking body 31 and provides the rotation axis for the positioning component 3, the first slot 33 and the second slot 34 are located exactly on both sides of the fixed shaft 32, and the distance between the two slots can meet the position requirements of the magnetic strip 2 to adapt to the electromagnetic coils 5 on different winding discs 4, ensuring that when the positioning component 3 rotates, the two slots can be aligned with different mating positions of the tail of the magnetic strip 2. When it is necessary for the magnetic strip 2 to cover the electromagnetic coil 5 on the first type of winding reel 4, the positioning component 3 is rotated around the fixed axis 32 to the first position. At this time, the first slot 33 will move to the front of the tail of the magnetic strip 2 as the locking body 31 rotates. The tail of the magnetic strip 2 can be naturally embedded in the first slot 33. The tight fit between the inner wall of the slot and the outer wall of the tail of the magnetic strip 2 restricts the sliding of the magnetic strip 2 along the preset direction of the frame 1. When it is necessary to switch to cover the electromagnetic coil 5 on another type of winding reel 4, there is no need to disassemble the positioning component 3. Just continue to rotate the positioning component 3 around the fixed axis 32 to the second position. At this time, the second slot 34 will replace the first slot 33 and move to the corresponding position of the tail of the magnetic strip 2. The tail of the magnetic strip 2 is then embedded in the second slot 34. Similarly, the position of the magnetic strip 2 is fixed by the cooperation between the slot and the tail of the magnetic strip. This embodiment can accurately lock the position of the magnetic strip 2 on the frame 1, ensuring that the magnetic strip 2 can always completely cover the electromagnetic coil 5 on the corresponding winding coil 4, avoiding the decrease in magnetic concentration effect due to the sliding and offset of the magnetic strip 2, thereby ensuring the thermal efficiency of the rice cooker as a whole; moreover, the two slots can be switched and matched with the magnetic strip 2 simply by rotating the positioning component 3, which is simple to operate and does not require replacing the entire magnetic strip frame. This allows one magnetic strip frame to be adapted to at least two different winding coils 4, completely changing the situation where the traditional magnetic strip frame can only be adapted to a single winding coil and new molds are required when the winding coil is changed, effectively reducing the mold cost of product development.

[0033] In a specific embodiment, such as Figure 3 and Figure 4 As shown, the locking body 31 is provided with an anti-rotation post 35; when the magnetic strip 2 is embedded in the first slot 33, the end face of the anti-rotation post 35 abuts against the side of the magnetic strip 2 to restrict the rotation of the positioning component 3; when the magnetic strip 2 is embedded in the second slot 34, the bottom surface of the locking body 31 fits against the side surface of the frame 1 to restrict the rotation of the positioning component 3.

[0034] The anti-rotation post 35 is provided on the locking body 31. The height and extension direction of the anti-rotation post 35 are designed to ensure that when the magnetic strip 2 is inserted into the first slot 33, the end face of the anti-rotation post 35 can make contact with the side of the magnetic strip 2. More specifically, the end face of the anti-rotation post 35 is kept flat so that a sufficient contact area can be formed when it contacts the side of the magnetic strip 2, and the contact will not be unstable due to the contact area being too small. When the magnetic strip 2 is inserted into the first slot 33, the end face of the anti-rotation post 35 will press tightly against the side of the magnetic strip 2, forming a physical barrier. At this time, if the positioning component 3 wants to rotate around the fixed axis 32, the anti-rotation post 35 will be blocked by the magnetic strip 2 and cannot continue to rotate, thus firmly restricting the rotation of the positioning component 3. When the magnetic strip 2 is inserted into the second slot 34, the bottom surface of the latch body 31 will be tightly attached to the side surface of the frame 1. Here, the bottom surface of the latch body 31 is also designed as a flat structure, and the side surface of the frame 1 is also smooth and flat. There will be no obvious gap when the two are attached. This tight attachment will generate sufficient resistance. At the same time, after the bottom surface of the latch body 31 contacts the side surface of the frame 1, if the positioning component 3 wants to rotate, it will be blocked by the frame 1 and cannot rotate smoothly, thus restricting the rotation of the positioning component 3.

[0035] When the magnetic strip 2 is embedded in the first slot 33, the precise contact of the anti-rotation post 35 ensures that the positioning component 3 will not experience slight shaking or accidental rotation. Even if the rice cooker vibrates during operation, the magnetic strip 2 remains stably locked in the first slot 33, always maintaining coverage of the corresponding electromagnetic coil 5, ensuring that the magnetizing effect is not compromised. When the magnetic strip 2 is embedded in the second slot 34, the tight fit between the bottom surface of the locking body 31 and the side surface of the frame 1 eliminates the need for additional fixing parts. The anti-rotation effect is achieved solely through the cooperation between the locking body 31 and the frame 1, simplifying the structure and ensuring reliability. This design also prevents the positioning component 3 from rotating under vibration, keeping the magnetic strip 2 stable in the second slot 34 and continuously covering the corresponding electromagnetic coil 5. This design also allows the positioning component 3 to function stably in both operating states, ensuring that the magnetic strip 2 will not shift due to the rotation of the positioning component 3, regardless of which slot it is embedded in. This allows the magnetic strip holder to stably adapt to different winding reels 4 without requiring readjustment or replacement of parts due to anti-rotation failure.

[0036] In a specific embodiment, the frame 1 is provided with a sliding track for guiding the magnetic strip 2 to slide along a preset direction. The magnetic strip 2 is embedded in the sliding track, and the outer wall of the magnetic strip 2 is in contact with the groove wall of the sliding track.

[0037] The sliding track on the frame 1 is a strip-shaped groove structure extending along a preset direction. This preset direction is designed based on the distribution of electromagnetic coils 5 at different positions on the winding reel 4, ensuring that as the magnetic strip 2 slides along the track, it can gradually approach and eventually cover the corresponding electromagnetic coil 5 on the winding reel 4. After the magnetic strip 2 is embedded in the sliding track, its outer wall will fit tightly against the groove wall of the sliding track, with no obvious gaps at the fit. This fit allows the magnetic strip 2 to always move along the extension direction of the track during the sliding process, without deviating from the preset path, avoiding the situation where the magnetic strip 2 tilts to one side and cannot be aligned with the electromagnetic coil 5 when sliding. Furthermore, the effects of this feature are quite significant. On the one hand, the guiding effect of the sliding track makes the sliding process of the magnetic strip 2 smoother. Operators do not need to frequently adjust the lateral position of the magnetic strip 2. They only need to push the magnetic strip 2 along the track direction, which greatly simplifies the operation of adjusting the position of the magnetic strip 2. On the other hand, the close fit between the magnetic strip 2 and the groove wall ensures that after the magnetic strip 2 slides to the target position, it will not deviate from the track due to slight vibration. This lays the foundation for the precise cooperation between the subsequent positioning component 3 and the magnetic strip 2, allowing the magnetic strip 2 to stably cover the electromagnetic coil 5 on the corresponding winding disc 4 and give full play to the magnetic focusing effect.

[0038] In a specific embodiment, such as Figure 1 As shown, the frame 1 is provided with a magnetic strip clamping buckle 12. One end of the magnetic strip clamping buckle 12 is fixedly connected to the top of the frame 1, and the other end extends in the direction of the magnetic strip 2, and the end face of the extended end abuts against the top surface of the magnetic strip 2, which is used to press the magnetic strip 2 into the sliding track of the frame 1.

[0039] The magnetic strip clamping buckle 12 installed on the frame 1 is positioned directly above the sliding rail on the frame 1, ensuring precise application to the magnetic strip 2 embedded in the sliding rail. One end of the magnetic strip clamping buckle 12 is fixedly connected to the top of the frame 1, for example, by integral molding with the frame 1 or by a reliable structure, and will not detach from the frame 1 during use. The other end extends towards the magnetic strip 2. More specifically, when the magnetic strip 2 is embedded in the sliding rail, the end face of the extended end of the magnetic strip clamping buckle 12 will abut tightly against the top surface of the magnetic strip 2, generating a moderate clamping force to press the magnetic strip 2 into the sliding rail. This embodiment effectively prevents the magnetic strip 2 from moving up and down within the sliding track, avoiding deviation of the magnetic strip 2 from its corresponding position with the electromagnetic coil 5 due to vertical offset. This ensures that the magnetic strip 2 always completely covers the electromagnetic coil 5, fully utilizing its magnetic focusing effect and thus guaranteeing the rice cooker's thermal efficiency. Furthermore, adjusting the position of the magnetic strip 2 does not require disassembling the magnetic strip clamping buckle 12; simply pushing the magnetic strip 2 completes the position adjustment, making the operation simple and convenient without additional disassembly or reassembly steps, saving adjustment time. Moreover, when the rice cooker vibrates during operation, the clamping force of the magnetic strip clamping buckle 12 firmly fixes the magnetic strip 2 within the sliding track, preventing it from loosening or rising due to vibration. It always maintains a close fit with the sliding track groove wall, continuously and stably covering the electromagnetic coil 5, preventing the magnetic focusing effect from being affected by the magnetic strip 2's vibration offset. At the same time, this structure does not rely on complex fixing parts, simplifying the overall design of the magnetic strip frame and reducing the difficulty of production and assembly.

[0040] In a specific embodiment, a silicone adhesive layer is provided around the assembly surface of the magnetic strip 2 and the frame 1.

[0041] The mounting surface where the magnetic strip 2 contacts the frame 1 is not entirely covered with silicone adhesive. Instead, silicone adhesive is applied specifically to the perimeter of the mounting surface. This perimeter specifically refers to the edge where the bottom of the magnetic strip 2 contacts the bottom of the sliding track groove on the frame 1. The amount and thickness of the silicone adhesive are carefully controlled during application to ensure that the cured adhesive layer does not protrude excessively, thus preventing the magnetic strip 2 from obstructing its adjustment along the preset direction within the sliding track. Simultaneously, insufficient application will not result in inadequate subsequent fixation. More specifically, when the magnetic strip 2 slides along the sliding track to the target position covering the electromagnetic coil 5 on the corresponding winding disc 4, the silicone adhesive applied around the mounting surface gradually cures. The cured silicone adhesive layer bonds the bottom perimeter of the magnetic strip 2 to the bottom of the sliding track groove on the frame 1, forming a stable fit.

[0042] The silicone adhesive layer works in conjunction with the magnetic strip clamping buckle 12 on the frame 1 to fix the magnetic strip 2. The magnetic strip clamping buckle 12 presses the magnetic strip 2 firmly into the sliding track from the top, while the silicone adhesive layer provides adhesive force from the bottom and all sides. This double fixation prevents the magnetic strip 2 from easily moving up and down or shifting left and right. In particular, it prevents the end of the magnetic strip 2 from sliding out when the rice cooker vibrates during operation, ensuring that the magnetic strip 2 always completely covers the electromagnetic coil 5 and continues to exert its magnetic focusing effect to ensure the rice cooker's thermal efficiency. Since the silicone adhesive layer is only set around the assembly surface and does not cover the entire assembly surface at the bottom of the magnetic strip 2, it does not make the magnetic strip 2 stick to the frame 1 and unable to slide, unlike a full coating. When it is necessary to change different winding coils 4 later, the magnetic strip 2 can still be pushed smoothly to adjust its position without disassembling the magnetic strip 2 or replacing the frame 1. This avoids the problem of traditional magnetic strip frames needing to be redesigned and molded due to insecure fixation, further improving the versatility of the magnetic strip frame and reducing product development costs.

[0043] In a specific embodiment, the tail of the frame 1 is provided with a limiting part, which is a protruding structure protruding from the end of the sliding track; when the positioning component 3 is removed from the frame 1, when the magnetic strip 2 slides along the sliding track to the tail, the end of the magnetic strip 2 abuts against the end face of the limiting part to limit the sliding stroke of the magnetic strip 2.

[0044] The limiting part at the tail of the frame 1 is a protruding structure directly protruding from the end of the sliding track. The protrusion of the limiting part is integrally formed with the frame 1 and the sliding track, without the need for additional installation or splicing of other parts. It has strong structural stability and will not break or fall off during use. Moreover, the end face of the limiting part facing the magnetic strip 2 is polished relatively flat, which can form sufficient contact with the end of the magnetic strip 2 and avoid damage to the end of the magnetic strip 2 due to insufficient contact area. When it is necessary to adapt to a winding reel larger than the existing winding reel 4, the positioning component 3 is first removed from the frame 1. At this time, the magnetic strip 2 is no longer restricted by the positioning component 3 and can slide freely along the sliding track towards the tail of the frame 1. As the magnetic strip 2 continues to move towards the tail, its end will gradually approach the end face of the limiting part until the two are completely abutted. At this time, the magnetic strip 2 can no longer slide towards the tail, and the sliding stroke is precisely limited within the sliding track.

[0045] The limiting part can firmly block the magnetic strip 2, preventing it from sliding out of the sliding track due to excessive sliding after the positioning component 3 is removed. This avoids the magnetic strip 2 falling or being damaged, or being unable to align with the electromagnetic coil 5 on the new winding spool due to sliding out of the track, ensuring that the magnetic strip 2 is always stably within the sliding track. The limiting part, through end face contact, allows the magnetic strip 2 to stop at the same fixed position each time it slides to the end, eliminating the need for operators to repeatedly adjust the position of the magnetic strip 2 to confirm alignment with the electromagnetic coil 5, thus simplifying the operation of adjusting the position of the magnetic strip 2. Furthermore, with the travel limitation of the limiting part, the magnetic strip holder can allow the magnetic strip 2 to slide to a more rearward position after the positioning component 3 is removed, thereby covering the electromagnetic coil 5 on a larger winding spool. Unlike traditional magnetic strip holders, there is no need to redesign the frame 1 and create a new mold as the winding spool size increases, which significantly improves the versatility of the magnetic strip holder and effectively reduces product development costs.

[0046] In a specific embodiment, the positioning component 3 rotates 90° from the first position to the second position. Figure 3 and Figure 4 As shown, when the electromagnetic coil 5 is wound on the ribs near the outer ring of the winding disc 4, the positioning component 3 rotates to the first position and the magnetic strip 2 can cover the electromagnetic coil 5; when the electromagnetic coil 5 is wound on the ribs near the inner ring of the winding disc 4, the positioning component 3 rotates to the second position and the magnetic strip 2 can cover the electromagnetic coil 5.

[0047] The positioning component 3 rotates from the first position to the second position around the axis of the fixed shaft 32, and the angle of this rotation is precisely controlled at 90°. This angle is designed based on the position of the electromagnetic coil 5 that the magnetic strip 2 needs to cover and the distribution distance of the slots on the latch body 31. This ensures that after rotation, the corresponding slot on the latch body 31 is exactly aligned with the tail of the magnetic strip 2, and there will be no situation where the slot is offset, causing the magnetic strip 2 to fail to be inserted smoothly.

[0048] More specifically, when the electromagnetic coil 5 is wound on the outer ribs of the winding reel 4, this winding method is typically used for winding reels 4 adapted to large-capacity rice cookers. This is because large-capacity rice cookers require a larger heating range, and the electromagnetic coil 5 can only cover a sufficient heating area if it is wound on the outermost ribs. At this point, the positioning component 3 is rotated to the first position. As the positioning component 3 rotates, the tail of the magnetic strip 2 will naturally embed into the slot on the locking body 31 corresponding to the first position. The overall position of the magnetic strip 2 will also be adjusted to perfectly correspond with the electromagnetic coil 5 on the outer ribs, preventing the electromagnetic coil 5 from having any... Any section exposed ensures no magnetic field is missed during magnetization. When the electromagnetic coil 5 is wound around the inner rib of the winding spool 4, this winding method is suitable for the winding spool 4 of a small-capacity rice cooker. The heating range of the small-capacity rice cooker is small, and the electromagnetic coil 5 can meet the heating requirements by being wound around the inner rib. At this time, it is only necessary to rotate the positioning component 3 90° from the first position around the axis of the fixed shaft 32 to the second position. The magnetic strip 2 will adjust its position synchronously with the rotation of the positioning component 3, and the tail is embedded into the slot on the locking body 31 corresponding to the second position. Finally, the magnetic strip 2 can accurately cover the electromagnetic coil 5 on the inner rib.

[0049] The fixed 90° rotation angle makes the position switching operation of the positioning component 3 very simple. Operators do not need to repeatedly try to check whether the magnetic strip 2 is aligned with the electromagnetic coil 5. A simple 90° rotation can quickly complete the adaptation of the two winding reels 4, saving adjustment time. Furthermore, by rotating the positioning component 3, the same magnetic strip frame can be adapted to two electromagnetic coils 5 with different rib positions. Unlike traditional magnetic strip frames, which require redesigning the frame 1 and making new molds because the position of the electromagnetic coil 5 on the winding reel 4 changes, this significantly reduces the mold cost of product development and significantly improves the versatility of the magnetic strip frame. Moreover, the magnetic strip 2 can completely cover the electromagnetic coils 5 in different positions, ensuring that the magnetic field generated by the electromagnetic coil 5 when working can be fully concentrated by the magnetic strip 2, regardless of whether the rice cooker is large or small capacity. This reduces the loss of the magnetic field due to outward diffusion and ensures that the thermal efficiency of the rice cooker will not decrease due to the replacement of the winding reel 4, maintaining a stable heating effect at all times.

[0050] Example 2 This embodiment provides a rice cooker, such as Figures 5-9 As shown, the rice cooker includes a main body, an inner pot, a winding reel 4, and the aforementioned magnetic strip holder. The inner pot is assembled inside the main body of the rice cooker. The winding reel 4 is fixed inside the base of the main body of the rice cooker and located below the inner pot. An electromagnetic coil 5 is wound on the winding reel 4. The frame 1 of the magnetic strip holder is fixed on the base of the main body of the rice cooker, and the magnetic strip 2 of the magnetic strip holder is arranged corresponding to the electromagnetic coil 5 to concentrate the magnetic field when the electromagnetic coil 5 is working.

[0051] The rice cooker body is the basic supporting structure of the entire device. All internal functional components are assembled around the rice cooker body. The inner pot, as the core component for holding rice and other ingredients, is stably and detachably assembled into the rice cooker body, making it convenient for users to take out and put in ingredients and clean them. The winding reel 4, as the key component that carries the electromagnetic coil 5, is fixed inside the base of the rice cooker body, and its installation position is exactly below the inner pot. This position design is not arbitrary, but to allow the magnetic field generated by the electromagnetic coil 5 when energized to act more directly and concentratedly on the inner pot, reducing the dispersion of the magnetic field in the transmission path. The electromagnetic coil 5 is tightly wound on the winding reel 4. When the rice cooker is powered on, the electromagnetic coil 5 will generate a magnetic field for heating through the current, which is the core component for the rice cooker to achieve the heating function. The frame 1 of the magnetic strip holder is fixed to the base of the rice cooker body in a suitable way, and the fixed position of the frame 1 corresponds precisely to the side of the winding reel 4, ensuring that the magnetic strip 2 on the frame 1 can be aligned with the electromagnetic coil 5 on the winding reel 4, and the subsequent magnetization effect will not be affected by the position deviation.

[0052] When the rice cooker starts working, the electromagnetic coil 5, once energized, diffuses a magnetic field in all directions. At this time, the magnetic strip 2 comes into play, concentrating this diffused magnetic field around the inner pot, preventing energy waste caused by the outward diffusion of the magnetic field. This helps improve the overall heating efficiency of the rice cooker, allowing the food in the inner pot to be heated to a thorough cooking temperature more quickly, while also reducing energy consumption. Furthermore, combined with the adjustable position of the magnetic strip 2 on the magnetic strip holder, when the rice cooker needs to adapt to inner pots of different capacities, it is only necessary to replace the winding reel 4 of the corresponding size (the larger the capacity, the larger the coverage area of ​​the winding reel 4 and the electromagnetic coil 5 is usually), and then adjust the position of the magnetic strip 2 on the magnetic strip holder to accurately align it with the electromagnetic coil 5 on the new winding reel 4. Unlike traditional rice cookers, there is no need to redesign the magnetic strip holder and create new molds due to changes in the size of the winding reel 4. This not only reduces the mold cost in the rice cooker production process but also shortens the research and development cycle for rice cookers of different capacities.

[0053] In a specific embodiment, such as Figure 9 As shown, the frame 1 of the magnetic strip holder is provided with a fixing ear 13 on its edge, and a fixing hole 14 is provided on the fixing ear 13; external fasteners pass through the fixing hole 14 to fix the frame 1 to the base.

[0054] The magnetic strip holder has at least two fixing ears 13 on its edge, which are distributed around the circumference of the holder 1, such as symmetrically arranged on both sides of the holder 1. This distribution allows the holder 1 to be fixed to the base with more balanced force, and prevents the holder 1 from tilting due to the offset of the fixing point. More specifically, the fixing ears 13 and the holder 1 are integrally formed, without additional splicing or welding, resulting in higher overall strength. During use, the fixing ears 13 will not break or fall off the holder 1. Each fixing ear 13 has a fixing hole 14. The diameter of the fixing hole 14 is precisely designed to match the diameter of the external fastener. This ensures that the fastener will not wobble when passing through the hole due to the hole being too large, nor will it be unable to pass through the hole due to the hole being too small, thus ensuring that the fastener can be firmly locked in the fixing hole 14. When it is necessary to fix the frame 1 to the base of the rice cooker body, first place the frame 1 in the designated position on the base, align the fixing hole 14 on the fixing ear 13 with the reserved installation position on the base, and then pass the external fastener through the fixing hole 14 and connect it to the base. As the fastener is tightened, the frame 1 will be firmly fixed on the base without displacement or loosening.

[0055] With the cooperation of the fixing ear 13 and the fixing hole 14, the frame 1 can be stably fixed on the base. Even if the rice cooker vibrates during operation, the frame 1 will not shift due to the vibration. This ensures that the magnetic strip 2 on the frame 1 can always accurately correspond to the electromagnetic coil 5 on the winding disc 4, and the magnetic strip 2 will not deviate from the electromagnetic coil 5 due to the shaking of the frame 1, thus affecting the magnetization effect.

[0056] In a specific embodiment, the winding reel 4 includes a first winding reel 41, a second winding reel 42, and a third winding reel 43, which are selected for use. The first winding reel 41, the second winding reel 42, and the third winding reel 43 are respectively adapted to the first inner liner, the second inner liner, and the third inner liner, with the capacities of the first inner liner, the second inner liner, and the third inner liner increasing sequentially. The magnetic strip 2 can be rotated to a first position by the positioning component 3 to cover the electromagnetic coil on the second winding reel 42. The magnetic strip 2 can be rotated to a second position by the positioning component 3 to cover the electromagnetic coil on the first winding reel 41. By removing the positioning component 3, the magnetic strip 2 can slide to cover the electromagnetic coil on the third winding reel 43.

[0057] The winding reel 4 includes a first winding reel 41, a second winding reel 42, and a third winding reel 43. These three reels are not installed in the rice cooker simultaneously, but are selected for use according to the required capacity of the inner pot. In other words, only one winding reel will be installed in the rice cooker, and multiple winding reels will not exist at the same time. These three winding reels are respectively adapted to the first inner pot, the second inner pot, and the third inner pot, and the capacity of the first inner pot, the second inner pot, and the third inner pot increases sequentially. Correspondingly, the size of the first winding reel 41, the second winding reel 42, and the third winding reel 43 also gradually increases with the increase of the inner pot capacity. The winding range of the electromagnetic coil on the winding reel also expands accordingly. The first winding reel 41 is the smallest, and its electromagnetic coil winding range is closest to the center of the winding reel. The second winding reel 42 is of medium size, and its electromagnetic coil winding range extends outward to the outer part of the center of the winding reel. The third winding reel 43 is the largest, and its electromagnetic coil winding range covers the outermost area of ​​the winding reel.

[0058] When the rice cooker is equipped with the first inner pot (small capacity), such as Figure 5 As shown, the first winding reel 41 will be installed accordingly. At this time, simply rotate the positioning component 3 to the second position. The positioning component 3 will drive the magnetic strip 2 to adjust to the position corresponding to the electromagnetic coil on the first winding reel 41, so that the magnetic strip 2 completely covers the electromagnetic coil. When the rice cooker is equipped with the second inner pot (medium capacity), as shown... Figure 6 As shown, corresponding to the installation of the second winding disc 42, rotating the positioning component 3 from the second position to the first position causes the magnetic strip 2 to move synchronously with the rotation of the positioning component 3, precisely covering the electromagnetic coil on the second winding disc 42; when the rice cooker is equipped with the third inner pot (large capacity), as... Figure 7 As shown, the third winding disc 43 is installed accordingly. Since the third winding disc 43 is larger and the electromagnetic coil covers a wider area, the positioning component 3 needs to be removed from the frame 1 to release the restriction on the magnetic strip 2. The magnetic strip 2 is then allowed to slide freely along the sliding track on the frame 1 until the position of the magnetic strip 2 can completely cover the electromagnetic coil on the third winding disc 43. During the sliding process, the magnetic strip 2 will not leave the sliding track and will always maintain a stable adjustment state.

[0059] In this embodiment, by rotating or disassembling the positioning component 3 and adjusting the position of the magnetic strip 2, one magnetic strip holder can adapt to at least three different sizes of winding reels. Unlike traditional solutions, this eliminates the need to redesign the magnetic strip holder structure and create new molds due to changes in the size of the winding reel, significantly reducing mold costs in product development. It also eliminates the need to redevelop the magnetic strip holder, shortening the development cycle for rice cookers of different capacities. On the other hand, regardless of which winding reel it adapts to, the magnetic strip 2 can accurately cover the electromagnetic coil on it through corresponding adjustments. This ensures that the magnetic strip 2 can effectively concentrate the magnetic field generated by the electromagnetic coil when the rice cooker is working, reducing magnetic field loss and ensuring that the thermal efficiency of rice cookers of different capacities remains stable. The magnetic concentration effect will not decrease due to the replacement of the winding reel. In addition, this adaptation method is simple to operate, requiring no complicated parts replacement or assembly steps. Only the state of the positioning component 3 and the position of the magnetic strip 2 need to be adjusted, which facilitates assembly during the production process and specification switching during subsequent maintenance.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A magnetic strip holder, characterized in that, The magnetic strip holder includes a frame, a magnetic strip, and a positioning component. The magnetic strip is disposed on the frame and can slide along a preset direction of the frame. The positioning component is assembled on the frame and can cooperate with the slid magnetic strip to limit the sliding of the magnetic strip. The position of the magnetic strip on the frame is adjusted and positioned by the positioning component so that the magnetic strip can cover the electromagnetic coils on the winding reels at different positions; The positioning component includes a latch body and a fixed shaft. The fixed shaft extends through the latch body along a direction perpendicular to its extension, with both ends of the fixed shaft extending out of the latch body. The side of the frame has shaft holes adapted to the fixed shaft. Both ends of the fixed shaft are inserted into the corresponding shaft holes, allowing the positioning component to rotate as a whole around the axis of the fixed shaft. The two ends of the latch body are respectively provided with a first slot and a second slot. When the positioning component rotates to the first position, the tail of the magnetic strip is embedded in the first slot. When the positioning component rotates to the second position, the tail of the magnetic strip is embedded in the second slot.

2. The magnetic strip holder according to claim 1, characterized in that, The latch body is provided with an anti-rotation post; when the magnetic strip is embedded in the first slot, the end face of the anti-rotation post abuts against the side of the magnetic strip to restrict the rotation of the positioning component; when the magnetic strip is embedded in the second slot, the bottom surface of the latch body fits against the side surface of the frame to restrict the rotation of the positioning component.

3. The magnetic strip holder according to claim 2, characterized in that, The frame is provided with a sliding track for guiding the magnetic strip to slide in a preset direction. The magnetic strip is embedded in the sliding track, and the outer wall of the magnetic strip is in contact with the groove wall of the sliding track.

4. The magnetic strip holder according to claim 3, characterized in that, The frame is equipped with a magnetic strip clamping buckle. One end of the magnetic strip clamping buckle is fixedly connected to the top of the frame, and the other end extends in the direction of the magnetic strip, with the end face of the extended end abutting against the top surface of the magnetic strip, for pressing the magnetic strip into the sliding track of the frame.

5. The magnetic strip holder according to claim 4, characterized in that, The magnetic strip is fitted with a silicone adhesive layer around the mounting surface of the frame.

6. The magnetic strip holder according to claim 3, characterized in that, The frame is provided with a limiting part at the tail end, which is a protruding structure protruding from the end of the sliding track. When the positioning component is removed from the frame, the magnetic strip slides along the sliding track to the tail end, and the end of the magnetic strip abuts against the end face of the limiting part to limit the sliding stroke of the magnetic strip.

7. The magnetic strip holder according to claim 1, characterized in that, The positioning component rotates 90° from the first position to the second position. When the electromagnetic coil is wound on the ribs near the outer ring of the winding disc, the positioning component rotates to the first position and the magnetic strip covers the electromagnetic coil. When the electromagnetic coil is wound on the ribs near the inner ring of the winding disc, the positioning component rotates to the second position and the magnetic strip covers the electromagnetic coil.

8. A rice cooker, characterized in that, The rice cooker includes a main body, an inner pot, a winding reel, and a magnetic strip holder as described in any one of claims 1-6. The inner pot is assembled inside the main body of the rice cooker. The winding reel is fixed inside the base of the main body of the rice cooker and located below the inner pot. An electromagnetic coil is wound on the winding reel. The frame of the magnetic strip holder is fixed on the base of the main body of the rice cooker, and the magnetic strips of the magnetic strip holder are arranged corresponding to the electromagnetic coil to concentrate the magnetic field when the electromagnetic coil is working.

9. The rice cooker according to claim 8, characterized in that, The frame of the magnetic strip holder is provided with fixing ears on its edge, and fixing holes are provided on the fixing ears; external fasteners pass through the fixing holes to fix the frame to the base.

10. The rice cooker according to claim 9, characterized in that, The winding reel includes a first winding reel, a second winding reel, and a third winding reel, which can be used selectively. The first winding reel, the second winding reel, and the third winding reel are respectively adapted to the first inner liner, the second inner liner, and the third inner liner, with the capacities of the first inner liner, the second inner liner, and the third inner liner increasing sequentially. The magnetic strip can be rotated to a first position by the positioning component to cover the electromagnetic coil on the second winding reel. The magnetic strip can be rotated to a second position by the positioning component to cover the electromagnetic coil on the first winding reel. Disassembling the positioning component allows the magnetic strip to slide and cover the electromagnetic coil on the third winding disc.

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