Magnet packaging structure

Abstract

The utility model discloses a magnet packaging structure, it includes metal piece, first plastic piece, second plastic piece, magnet and third plastic piece, the metal piece is placed in the first plastic piece forming die cavity and carries out first forming, and the metal piece is combined with first plastic piece and is formed as first combined part, and first combined part has an open upward containing groove, and the magnet is contained in the containing groove, and the groove bottom of containing groove is the metal groove bottom defined by metal piece, and the second plastic piece is embedded in the containing groove of first combined part, and covers the containing groove mouth, and the second plastic piece is combined with first combined part and forms second combined part, and second combined part is placed in the forming die cavity of third plastic piece and carries out second forming, and second combined part is combined with third plastic piece and is formed as magnetic attraction component, and the metal groove bottom is exposed on the outer surface of magnetic attraction component. The utility model discloses through multilayer packaging, the packaging structure of step-by-step forming, effectively solved the problem that magnet high temperature demagnetization and magnetic attraction force weaken because of the increase of interval.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic components technology, specifically relating to a magnet encapsulation structure. Background Technology

[0002] Magnets possess magnetic attraction and are widely used in various magnetic components. The cooperation of two magnets enables two components to move closer, separate, or move synchronously. For ease of assembly, magnets are often directly injection molded into the plastic part to form the final magnetic component. However, direct contact between magnets and high-temperature molten colloid can cause high-temperature demagnetization. In addition, to ensure the structural strength of the plastic part, its molding thickness is relatively thick, which increases the distance between the two mating magnets, weakens the magnetic attraction between the two magnets, and affects the magnetic attraction effect of the magnetic component. Summary of the Invention

[0003] This invention provides a magnet encapsulation structure to address the aforementioned technical problems. The objective of this invention is achieved through the following technical solution:

[0004] A magnet encapsulation structure includes a metal part, a first plastic part, a second plastic part, a magnet, and a third plastic part. The metal part is initially formed in the cavity of a mold for the first plastic part. The metal part and the first plastic part are combined to form a first assembly for assembling the magnet. The first assembly has an upward-opening receiving groove in which the magnet is received. The bottom of the receiving groove is a metal bottom defined by the metal part, and the magnet is in close contact with the metal bottom, which has a thin-walled structure. The second plastic part is embedded in the receiving groove of the first assembly. The second plastic part and the first assembly are combined to form a second assembly, and the second plastic part seals the opening of the receiving groove, sealing the magnet inside the receiving groove. The second assembly is then formed in the cavity of a mold for the third plastic part. The second assembly and the third plastic part are combined to form the final magnetic attraction component, with the metal bottom exposed on the outer surface of the magnetic attraction component.

[0005] Preferably, the metal part includes a bottom wall and an annular surrounding wall, the first plastic part has a through hole, the bottom of the first plastic part has an annular groove for receiving the annular surrounding wall of the metal part, the annular groove is distributed around the through hole, the bottom wall of the metal part seals the bottom of the through hole, and the receiving groove is jointly defined by the bottom wall of the metal part and the hole wall of the through hole.

[0006] Preferably, the second assembly includes a main body and a magnetic suction part located below the main body, with the second plastic part distributed in the main body and the metal part distributed in the magnetic suction part.

[0007] Preferably, the third plastic part is a thin-walled shell structure, defining a downward-facing main body cavity, in which the main body of the second assembly is accommodated.

[0008] Preferably, the third plastic part has a first contact surface, the second assembly has a second contact surface, and the first contact surface of the third plastic part and the second contact surface of the second assembly are fused together to form the magnetic attraction component.

[0009] Preferably, the first contact surface is the inner wall of the main cavity, and the second contact surface is the top wall and side walls of the main body.

[0010] Preferably, the second contact surface includes the exposed wall of the second plastic part, and the exposed wall smoothly transitions with the outer wall of the first plastic part.

[0011] Compared with the prior art, this utility model has the following technical advantages: The multi-layer encapsulation and step-by-step molding encapsulation structure effectively solves the problems of magnet demagnetization at high temperatures and weakening of magnetic attraction due to increased spacing. The magnet is first assembled into a first assembly consisting of a metal part and a first plastic part, then sealed by a second plastic part to form a second assembly. This second assembly is then combined with a third shell to form the final magnetic attraction component. Throughout the molding process, the magnet does not directly contact the high-temperature molten adhesive, effectively protecting it and preventing high-temperature demagnetization. The metal part has higher structural strength than the plastic part and can adopt a thin-walled structure. The thin-walled metal groove bottom effectively reduces the spacing between the two mating magnets, reducing magnetic force attenuation. Multiple insert fusion molding forms a strong bond between multiple components, improving the overall structural strength of the magnetic attraction component. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the present invention;

[0014] Figure 3 This is a schematic diagram of the second assembly structure in this utility model;

[0015] Figure 4 This is a schematic diagram of the first assembly structure in this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the first plastic part in this utility model;

[0017] Figure 6 This is a schematic diagram of the third plastic part in this utility model;

[0018] The markings in the figure are: first plastic part 10; through hole 11; annular groove 12; second plastic part 20; third plastic part 30; main body cavity 31; metal part 40; magnet 50; main body 71; magnetic attraction part 72. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0020] See Figures 1-6 This embodiment discloses a magnet encapsulation structure, which includes a metal part 40, a first plastic part 10, a second plastic part 20, a magnet 50, and a third plastic part 30.

[0021] The metal part 40 is initially formed in the mold cavity of the first plastic part 10. The metal part 40 and the first plastic part 10 are combined to form a first assembly for assembling the magnet 50. The first assembly has an upward-opening receiving groove in which the magnet 50 is accommodated. The second plastic part 20 is embedded in the receiving groove of the first assembly. The second plastic part 20 and the first assembly are combined to form a second assembly, and the second plastic part 20 seals the opening of the receiving groove, sealing the magnet 50 inside. The second assembly is then formed in the mold cavity of the third plastic part 30 for a second forming. The second assembly and the third plastic part 30 are combined to form the final magnetic attraction component, with the bottom of the metal groove exposed on the outer surface of the magnetic attraction component. In this embodiment, the magnetic attraction component is a magnetic operating lever used on a cup lid. Through a unique multi-layer encapsulation and step-by-step forming structure, the two technical problems of high-temperature demagnetization of the magnet 50 and the weakening of magnetic attraction due to increased spacing are solved. The magnet 50 is not directly injected into the third plastic part 30. Instead, it is first placed in a protective shell composed of a metal part 40 and a first plastic part 10, and then sealed by a second plastic part 20. Finally, this sealed second assembly is placed into the mold for secondary bonding and molding. Throughout the molding process, the magnet 50 does not come into direct contact with the high-temperature molten adhesive, which effectively protects the magnet 50 and avoids high-temperature demagnetization.

[0022] The metal part 40 includes a bottom wall and an annular surrounding wall. The first plastic part 10 has a through hole 11. The bottom of the first plastic part 10 has an annular groove 12 for accommodating the annular surrounding wall of the metal part 40. The annular groove 12 is distributed around the through hole 11. The bottom wall of the metal part 40 seals the bottom of the through hole 11. The receiving groove is defined by the bottom wall of the metal part 40 and the hole wall of the through hole 11. The bottom of the receiving groove is a metal groove bottom defined by the metal part 40, and the magnet 50 is in close contact with the metal groove bottom. The metal groove bottom has a thin-walled structure. Magnet 50 is in close contact with the bottom of a metal groove composed of metal parts 40. The bottom of the metal groove is designed with a thin-walled structure. In the final product, the bottom of the metal groove is located on the outer surface of the magnetic attraction component. This design ensures that when the two magnetic attraction components are engaged, the magnets 50 of the other and the magnets of the other are separated by only a very thin metal wall. Compared to the traditional solution where a thicker plastic part separates them, this solution greatly shortens the effective magnetic circuit gap, thereby significantly improving the final magnetic attraction force. Furthermore, a magnetically conductive metal can be used to further enhance the magnetic attraction force.

[0023] The second assembly includes a main body 71 and a magnetic attraction part 72 located below the main body 71. The second plastic part 20 is distributed in the main body 71, and the metal part 40 is distributed in the magnetic attraction part 72. The third plastic part 30 is a thin-walled shell structure, defining a downward-opening main body cavity 31, within which the main body 71 of the second assembly is housed. The third plastic part 30 has a first contact surface, and the second assembly has a second contact surface. The first contact surface of the third plastic part 30 and the second contact surface of the second assembly are fused to form the magnetic attraction component. The fusion of the first contact surface of the third plastic part 30 and the second contact surface of the second assembly achieves complete sealing of the magnet 50, preventing moisture, dust, etc., from entering, improving the environmental adaptability and service life of the magnetic attraction component, and ensuring the structural strength of the magnetic attraction component.

[0024] The first contact surface is the inner wall of the main cavity 31, and the second contact surface is the top wall and side walls of the main body. The second contact surface includes the exposed wall of the second plastic part 20, and the exposed wall smoothly transitions with the outer wall of the first plastic part 10. This configuration makes the overall structure of the magnetic component more compact and aesthetically pleasing, and facilitates mold manufacturing and demolding of the component.

[0025] It should be understood that in the claims and description of this utility model, all instances of "comprising..." should be understood as having an open-ended meaning, that is, equivalent to "at least comprising...", and should not be understood as having a closed-ended meaning, that is, its meaning should not be understood as "only comprising...". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0026] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnet encapsulation structure, characterized in that, The assembly includes a metal part, a first plastic part, a second plastic part, a magnet, and a third plastic part. The metal part is initially formed in the cavity of the first plastic part molding mold. The metal part and the first plastic part are combined to form a first assembly for assembling the magnet. The first assembly has an upward-opening receiving groove, in which the magnet is received. The bottom of the receiving groove is a metal bottom defined by the metal part, and the magnet is in close contact with the metal bottom, which has a thin-walled structure. The second plastic part is embedded in the receiving groove. The second plastic part and the first assembly are combined to form a second assembly, and the second plastic part seals the opening of the receiving groove, sealing the magnet inside. The second assembly is then formed in the cavity of the third plastic part molding mold. The second assembly and the third plastic part are combined to form the final magnetic attraction component, with the metal bottom exposed on the outer surface of the magnetic attraction component.

2. The magnet encapsulation structure according to claim 1, characterized in that, The metal part includes a bottom wall and an annular surrounding wall. The first plastic part has a through hole. The bottom of the first plastic part has an annular groove for receiving the annular surrounding wall of the metal part. The annular groove is distributed around the through hole. The bottom wall of the metal part seals the bottom of the through hole. The receiving groove is defined by the bottom wall of the metal part and the hole wall of the through hole.

3. A magnet encapsulation structure according to claim 1 or 2, characterized in that, The second assembly includes a main body and a magnetic suction part located below the main body. The second plastic part is distributed in the main body, and the metal part is distributed in the magnetic suction part.

4. The magnet encapsulation structure according to claim 3, characterized in that, The third plastic part is a thin-walled shell structure, which defines a downward-facing main body cavity, and the main body of the second assembly is housed within the main body cavity.

5. A magnet encapsulation structure according to claim 4, characterized in that, The third plastic part has a first contact surface, the second assembly has a second contact surface, and the first contact surface of the third plastic part and the second contact surface of the second assembly are fused together to form the magnetic attraction component.

6. A magnet encapsulation structure according to claim 5, characterized in that, The first contact surface is the inner wall of the main cavity, and the second contact surface is the top wall and side walls of the main body.

7. A magnet encapsulation structure according to claim 6, characterized in that, The second contact surface includes the exposed wall of the second plastic part, and the exposed wall smoothly transitions to the outer wall of the first plastic part.

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