Flexible magnetic attraction locking structure

Abstract

The utility model discloses a flexible magnetic attraction position locking structure which comprises a main flexible magnetic attraction fixing band and an auxiliary flexible magnetic attraction fixing band, tooth-shaped structures are arranged on magnetic attraction faces of the main flexible magnetic attraction fixing band and the auxiliary flexible magnetic attraction fixing band, and the main flexible magnetic attraction fixing band and the auxiliary flexible magnetic attraction fixing band are stably fixed in a staggered buckling and magnetic attraction mode of tooth shapes of the magnetic attraction faces. Arc curved surface transition structures are arranged at the heads and the tails of the magnetic attraction faces of the main flexible magnetic attraction fixing band and the auxiliary flexible magnetic attraction fixing band, the situations that corners tilt up during magnetic attraction and the like are prevented, the magnetic attraction locking reliability is improved, meanwhile, stepless adjustment can be achieved between the main flexible magnetic attraction fixing band and the auxiliary flexible magnetic attraction fixing band, tangential magnetic attraction is reliable in the using process, and accidental separation is not prone to occurring. The structure aims at providing a connection mode which is firm and stable in position locking, and can be applied to the field of magnetic fixing bands, such as civil strapping bands, medical ribbons, magnetic watchbands and the like.

Description

Technical Field

[0001] This utility model relates to the field of flexible magnetic locking technology, specifically to a flexible magnetic locking structure. Background Technology

[0002] Traditional fastening straps typically use Velcro, elastic bands, or mechanical buckles, which are prone to loosening during movement. Over time, they may lose elasticity, develop poor adhesion, and have limited adjustability, affecting their effectiveness. Furthermore, they suffer from weak tangential magnetic attraction, making accidental separation easy. In contrast, magnetic fastening straps offer adjustable length and can be used as cable ties in civilian applications, as lumbar supports and orthopedic fixations in the medical field, and as watch straps and magnetic clasps in the consumer electronics industry. They offer advantages such as versatility, easy disassembly, and comfort, aiming to solve the problems of weak tangential magnetic attraction and unreliable magnetic attraction in traditional magnetic applications.

[0003] Samarium iron nitrogen (SFeNi) is an emerging rare earth material with higher magnetic properties than ferrites and comparable to neodymium iron boron (NdFeB). The average particle size of SFeNi magnetic powder is 1–5 μm, while that of NdFeB magnetic powder is 80–150 μm. This results in magnetic devices made from SFeNi magnetic powder having a more delicate feel and texture, as well as excellent oxidation and corrosion resistance. Therefore, the anisotropic SFeNi composite material in this invention has good applicability.

[0004] CN220966602U discloses a flexible magnetic watch strap. The disclosed preparation process only involves planar multipole magnetization of the watch strap, while the anisotropic samarium iron nitrogen material is not oriented, resulting in relatively low performance. In other words, the magnetism of the anisotropic samarium iron nitrogen magnetic powder cannot be fully utilized, reducing the magnetic attraction of the watch strap and failing to meet the requirements for high magnetic attraction.

[0005] CN216652577U discloses a magnetic waist support belt with a third connecting belt that is detachably connected via an extension belt. A first movable block and a second movable block are provided on a metal plate and connected to it by magnetism. This method uses a strong magnet to connect to the metal plate, but it does not have a flexible adjustment function and has low magnetic attraction freedom. Utility Model Content

[0006] This invention addresses the problems of poor fixing effect, difficulty in adjusting tightness, and weak tangential magnetic attraction of traditional fixing straps by providing a flexible magnetic locking structure made of anisotropic samarium iron nitrogen and its composite materials. This structure has good tangential magnetic attraction and high degree of freedom locking capability, aiming to solve the technical problems existing in the current fixing straps.

[0007] The structure of this utility model is achieved through the following solution:

[0008] A flexible magnetic locking structure includes a main flexible magnetic fixing band and a secondary flexible magnetic fixing band;

[0009] Both the main flexible magnetic fixing band and the secondary flexible magnetic fixing band are made of anisotropic samarium iron nitrogen composite material, which includes anisotropic samarium iron nitrogen magnetic components and flexible polymer resin binder components; the main flexible magnetic fixing band and the secondary flexible magnetic fixing band have magnetically attracted surfaces that attract each other.

[0010] The main and auxiliary flexible magnetic fixing bands are characterized by toothed magnetic surfaces and rounded edges at both ends. Through the interlocking of the toothed magnetic surfaces and magnetic attraction, they are securely fixed. The rounded edges at the ends of the magnetic surfaces prevent corners from lifting during magnetic attraction, improving the reliability of the magnetic locking. Furthermore, the main and auxiliary flexible magnetic fixing bands are infinitely adjustable, and the tangential magnetic attraction is reliable during use, reducing the likelihood of accidental separation.

[0011] The tooth profile is one or more of the following: involute tooth profile, circular arc tooth profile, sawtooth tooth profile, and rectangular tooth profile.

[0012] The tooth profile and pitch can be set according to actual needs. Under normal circumstances, the tooth profile and pitch are greater than 1mm.

[0013] The tooth shape can be continuously and evenly distributed on the magnetic surface or distributed in multiple segments at intervals on the magnetic surface.

[0014] The anisotropic samarium iron nitrogen magnetic array is one or more of the following: anisotropic samarium iron nitrogen, anisotropic samarium iron nitrogen hybridized with ferrite, and anisotropic samarium iron nitrogen hybridized with neodymium iron boron.

[0015] The flexible polymer resin adhesive component is one or more of rubber, TPE, TPU, and CPE.

[0016] The teeth are spaced apart along the long side of the main and auxiliary flexible magnetic fixing bands and are parallel to the short side.

[0017] The main flexible magnetic fixing band and the secondary flexible magnetic fixing band are manufactured by injection molding, extrusion molding or calendering.

[0018] The main flexible magnetic absorbing fixing strip and the secondary flexible magnetic absorbing fixing strip are oriented using electromagnetic fields or permanent magnetic fields during the forming process.

[0019] The main flexible magnetic fixing strip and the secondary flexible magnetic fixing strip are oriented in the thickness direction or in a single-sided multi-pole orientation.

[0020] After orientation, the main flexible magnetic fixing strip and the secondary flexible magnetic fixing strip are magnetized on one side, and the magnetizing magnetic field is greater than 1.5T.

[0021] The number of magnetized poles on one side is greater than or equal to 1.

[0022] The surfaces of the main and auxiliary flexible magnetic fixing strips are coated with PU, pyrene, epoxy, etc., so that their surfaces have PU, pyrene, epoxy, etc.

[0023] The flexible magnetic locking structure can be used in the field of magnetic fastening straps, such as civilian cable ties, medical cable ties, and magnetic watch straps.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) Flexible polymer resin is selected as the adhesive, and the magnetic fixing band can achieve large-arc bending and has good wearing comfort.

[0026] (2) The flexible magnetic locking structure combines tooth shape and arc surface. On the basis of providing large magnetic force, it can effectively realize the locking function, making the magnetic attraction more reliable and less prone to accidental separation.

[0027] (3) The magnetic fixing strap is magnetic in its entirety, which can be used for magnetic requirements of different lengths and has a high degree of adjustment freedom. Attached Figure Description

[0028] Figure 1 The diagram shows the structure and magnetic pole distribution of the main and auxiliary flexible magnetic attraction fixing strips in Examples 1, 2, 1, and 2.

[0029] Figure 2 for Figure 1 A magnified view of a portion of the view.

[0030] Figure 3 The magnetic locking method of the main and auxiliary flexible magnetic fixing belts in Example 1, Example 2, Comparative Example 1, and Comparative Example 2.

[0031] Figure 4 This is another form of main and auxiliary flexible magnetic attraction fixing belt structure for Examples 1, 2, Comparative Examples 1 and 2.

[0032] Figure 5 for Figure 4 A magnified view of a portion of the image.

[0033] Figure 6 This is another magnetic locking method for the main and auxiliary flexible magnetic fixing straps in Examples 1, 2, 1, and 2.

[0034] Figure 7 The diagram shows the structure and magnetic pole distribution of the main and auxiliary flexible magnetic attraction fixing strips in Comparative Examples 3 and 4.

[0035] Figure 8 The magnetic locking method of the main and auxiliary flexible magnetic fixing belts in Comparative Examples 3 and 4. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model. Modifications or equivalent substitutions made by those skilled in the art based on their understanding of the technical solutions of this utility model, without departing from the spirit and scope of the technical solutions of this utility model, should all be covered within the protection scope of this utility model.

[0037] All raw materials used in the following specific embodiments were purchased commercially. The average particle size of the ferrite magnetic powder was 1–3 μm; the average particle size of the samarium iron nitride magnetic powder was 1–5 μm; and the average particle size of the neodymium iron boron magnetic powder was 80–100 μm. In the embodiments, the flexible magnetic fixing strip has a long side of 150 mm, a short side of 20 mm, and a thickness of 1.5 mm.

[0038] Example 1: Anisotropic Samarium Iron Nitrogen Tripolar Structure in TPE Matrix (Injection Molding Orientation)

[0039] Appendix Figure 1 , 2 As shown in Figure 3, the main and auxiliary flexible magnetic fixing strips use TPE as a binder and anisotropic samarium iron nitrogen as magnetic powder. The mixture of 90 wt% anisotropic samarium iron nitrogen magnetic powder and 10 wt% TPE is extruded and granulated, then injection molded (the magnetic surface has a serrated edge, and the beginning and end of the magnetic surface have rounded curves, such as...). Figure 2 As shown, the arc surface specifically refers to the arc-shaped edges at the beginning and end, which gradually thins from the normal thickness towards the edge. It is injection molded and formed. During the molding process, a single-sided 3-pole orientation is performed in the mold, and the magnetic poles of the main and auxiliary flexible magnetic attraction fixing strips are oppositely distributed. After injection molding, a single-sided 3-pole magnetizing fixture (magnetizing magnetic field 3T) is used to magnetize the main and auxiliary flexible magnetic attraction fixing strips to form a set of flexible magnetic attraction locking structures.

[0040] Example 2: Anisotropic samarium iron nitrogen + anisotropic neodymium iron boron tripolar structure in TPE matrix (injection molding orientation)

[0041] Appendix Figure 1 , 2 As shown in Figure 3, the main and auxiliary flexible magnetic attraction fixing strips use TPE as a binder and anisotropic samarium iron nitrogen and anisotropic neodymium iron boron composite materials as magnetic powders. After being mixed and extruded and granulated, the mixture is injection molded through an injection molding die (with toothed and arc-shaped surfaces, the same as in Example 1). During the molding process, the main and auxiliary flexible magnetic attraction fixing strips are oriented in a single-sided 3-pole orientation within the die, and the magnetic poles of the main and auxiliary flexible magnetic attraction fixing strips are oppositely distributed. After injection molding, the main and auxiliary flexible magnetic attraction fixing strips are magnetized using a single-sided 3-pole magnetizing jig (magnetizing magnetic field 3T) to form a set of flexible magnetic locking structures.

[0042] Comparative Example 1: TPE matrix anisotropic ferrite tripolar structure (injection molding orientation)

[0043] Appendix Figure 4-6 As shown, the main and auxiliary flexible magnetic fixing strips use TPE as a binder and anisotropic ferrite as magnetic powder. The mixture of 90wt% anisotropic ferrite magnetic powder and 10wt% TPE is extruded and granulated, and then injection molded through an injection molding die (with toothed and arc-shaped surfaces, the same as in Example 1). During the molding process, single-sided 3-pole orientation is performed in the mold, and the magnetic pole distribution of the main and auxiliary flexible magnetic fixing strips is opposite. After injection molding, the main and auxiliary flexible magnetic fixing strips are magnetized using a single-sided 3-pole magnetizing jig (magnetizing magnetic field 3T) to form a set of flexible magnetic locking structures.

[0044] Comparative Example 2: Anisotropic Samarium Iron Nitrogen Tripolar Structure in TPE Matrix (Non-Oriented Injection Molding)

[0045] Appendix Figure 4-6 As shown, the main and auxiliary flexible magnetic fixing strips use TPE as a binder and anisotropic samarium iron nitrogen as magnetic powder. After being mixed and extruded and granulated with 90wt% anisotropic samarium iron nitrogen magnetic powder and 10wt% TPE, they are injection molded through an injection molding mold (with toothed and arc-shaped surfaces, the same as in Example 1). There is no orientation magnetic field during the molding process. After injection molding, the main and auxiliary flexible magnetic fixing strips are magnetized using a single-sided 3-pole magnetizing fixture (magnetizing magnetic field 3T) to form a set of flexible magnetic locking structures.

[0046] Comparative Example 3: Anisotropic Samarium Iron Nitrogen Tripolar Structure in CPE Matrix (Extrusion Orientation)

[0047] Appendix Figure 7 , 8 As shown, the main and auxiliary flexible magnetic fixing strips use CPE as a binder and anisotropic samarium iron nitrogen as magnetic powder. The mixture of 90wt% anisotropic samarium iron nitrogen magnetic powder and 10wt% CPE is intensively mixed and then extruded through an extrusion die. During the forming process, single-sided 3-pole orientation is performed within the die, and the magnetic poles of the main and auxiliary flexible magnetic fixing strips are opposite. After extrusion, the main and auxiliary flexible magnetic fixing strips are magnetized using a single-sided 3-pole magnetizing fixture (magnetizing magnetic field 3T) to form a set of flexible magnetic locking structures.

[0048] Comparative Example 4: Isotropic NdFeB 3-pole structure in rubber matrix (calendering orientation)

[0049] Appendix Figure 7 , 8As shown, the main and auxiliary flexible magnetic fixing strips use rubber as a binder and anisotropic samarium iron nitrogen as magnetic powder. The mixture of 93wt% isotropic neodymium iron boron magnetic powder and 7wt% rubber is rolled and calendered to achieve the desired thickness. The strips are then cut to the specified dimensions and vulcanized. After molding, the main and auxiliary flexible magnetic fixing strips are magnetized using a single-sided 3-pole magnetizing fixture (magnetizing voltage 3T) to create a set of flexible magnetic locking structures.

[0050] The surface magnetic strength, tangential magnetic attraction force (effective attraction length 50mm), and bending edge warping of the flexible magnetic locking structures prepared in Examples 1-2 and Comparative Examples 1-4 were measured. The test results are shown in Table 1.

[0051] Table 1. Performance test results of the examples and comparative examples.

[0052]

[0053]

[0054] Comparing Examples 1, 2 and Comparative Example 1, the flexible magnetic locking structures of Examples 1 and 2, which use anisotropic samarium iron nitrogen composite materials, exhibit significantly better surface magnetism and magnetic attraction, and can be applied to some occasions with high requirements for magnetic locking.

[0055] In Comparative Example 2, since the magnetic locking structure was not oriented and was directly magnetized, the anisotropic samarium iron nitrogen magnetic powder was not arranged in a specific direction, resulting in low surface magnetism and magnetic attraction force. It can be applied to some occasions where the requirements for magnetic locking are relatively low.

[0056] Comparative Example 3 used an extrusion molding process and Comparative Example 4 used a calendering molding process to prepare a flexible magnetic locking structure. Neither of them designed toothed or curved surface structures. As a result, they would warp under magnetic bending conditions, and their magnetic attraction was not as strong as in Examples 1 and 2. They were also prone to slippage when pulled tangentially, which made the magnetic locking unreliable.

[0057] Therefore, the flexible magnetic locking structure made of anisotropic samarium iron nitrogen composite material of this invention has good performance and has many advantages in the application of flexible magnetic locking.

Claims

1. A flexible magnetic locking structure, characterized in that: Includes a main flexible magnetic absorbing fixing band and a secondary flexible magnetic absorbing fixing band; The main flexible magnetic attraction fixing strip and the secondary flexible magnetic attraction fixing strip have the same structure and are both made of anisotropic samarium iron nitrogen composite material, which includes anisotropic samarium iron nitrogen magnetic components and flexible polymer resin binder components. The magnetic surfaces of both the main flexible magnetic fixing band and the auxiliary flexible magnetic fixing band have interlocking teeth, and the magnetic surfaces have arc-shaped surfaces at both ends.

2. The flexible magnetic locking structure according to claim 1, characterized in that: The tooth profile is one or more of the following: involute tooth profile, circular arc tooth profile, sawtooth tooth profile, and rectangular tooth profile.

3. The flexible magnetic locking structure according to claim 1, characterized in that: The anisotropic samarium iron nitrogen magnetic composition is one or more of the following: anisotropic samarium iron nitrogen, anisotropic samarium iron nitrogen hybridized with ferrite, and anisotropic samarium iron nitrogen hybridized with neodymium iron boron.

4. The flexible magnetic locking structure according to claim 1, characterized in that: The flexible polymer resin adhesive component is one or more of rubber, TPE, TPU, and CPE.

5. The flexible magnetic locking structure according to claim 1, characterized in that: The toothed shape is distributed at intervals along the long side of the main flexible magnetic attraction fixing band and the secondary flexible magnetic attraction fixing band, and is parallel to the short side.

6. The flexible magnetic locking structure according to claim 1, characterized in that: The main flexible magnetic fixing band and the secondary flexible magnetic fixing band are manufactured by injection molding, extrusion molding or calendering.

7. The flexible magnetic locking structure according to claim 6, characterized in that: The main flexible magnetic absorbing fixing strip and the secondary flexible magnetic absorbing fixing strip are oriented using electromagnetic fields or permanent magnetic fields during the forming process.

8. The flexible magnetic locking structure according to claim 1, characterized in that: The main flexible magnetic fixing strip and the secondary flexible magnetic fixing strip are oriented in the thickness direction or in a single-sided multi-pole orientation.

9. The flexible magnetic locking structure according to claim 8, characterized in that: After orientation, the main flexible magnetic fixing strip and the secondary flexible magnetic fixing strip are magnetized on one side, and the magnetizing magnetic field is greater than 1.5T.

10. The flexible magnetic locking structure according to claim 9, characterized in that: The number of magnetized poles on one side is greater than or equal to 1.

11. The flexible magnetic locking structure according to claim 1, characterized in that: The surfaces of the main flexible magnetic fixing band and the secondary flexible magnetic fixing band also include PU, pyrene, and epoxy coatings.

Images