Magnetic attraction fixing device

Abstract

The utility model discloses a magnetic attraction fixing device which comprises a fixing part, a contact part and a magnetic attraction piece, and the contact part is used for abutting against an attracted object. The magnetic attraction part is arranged on one of the fixing part and the contact part and used for attracting an attracted object. Wherein the contact part is rotationally connected with the fixed part, when the adsorbed object bears torsion, the contact part and the adsorbed object can synchronously rotate relative to the fixed part, or the contact part is rotationally connected with the fixed part, the contact part is in rolling contact with the adsorbed object, and when the adsorbed object bears torsion, the contact part supports the contacted object to rotate in a rolling mode. And the contact part and the adsorbed object can rotate relative to the fixed part. According to the magnetic attraction fixing device, equipment can be prevented from being damaged when a user has the use requirement for contact type rotation, and the use experience feeling is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of magnetic products, and in particular to a magnetic fixing device. Background Technology

[0002] Currently, the main methods for fixing mobile phones, tablets and other devices on the market are clamping and magnetic attraction. Magnetic attraction devices use magnetic attraction to connect and fix the device (mobile phone, tablet, etc.) to the device.

[0003] Magnetic connections primarily restrict the direction in which the attracted device (phone, tablet, etc.) detaches, but they offer less restriction on contact-based relative movement, especially rotation.

[0004] However, users often have the need for contact-based movement or rotation, which causes relative movement and friction between the magnetic fixing device and the attached device (phone, tablet, etc.), resulting in damage to the user's device (phone, tablet, protective case, etc.). This makes the user experience of existing magnetic fixing devices poor, and users have concerns and complaints about damage to their personal valuables. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a magnetic fixing device that can prevent damage to the equipment when the user needs to rotate it by contact, thus improving the user experience.

[0006] A magnetic fixing device according to an embodiment of the present invention includes:

[0007] Fixed components;

[0008] Contact components are used to come into contact with the adsorbed material;

[0009] A magnetic attractor, disposed in one of the fixing component and the contact component, is used to attract an object;

[0010] The contact component is rotatably connected to the fixed component. When the adsorbed object is subjected to torque, the contact component and the adsorbed object can rotate synchronously relative to the fixed component. Alternatively, the contact component is rotatably connected to the fixed component, and the contact component is in rolling contact with the adsorbed object. When the adsorbed object is subjected to torque, the contact component rolls to support the rotation of the contacted object, and the contact component and the adsorbed object can rotate relative to the fixed component.

[0011] A magnetic fixing device according to an embodiment of the present utility model has at least the following beneficial effects:

[0012] This invention comprises a fixing component, a contact component, and a magnetic attractor. The contact component abuts against the object to be attracted. The magnetic attractor is located in one of the fixing and contact components and attracts the object. The contact component is rotatably connected to the fixing component. When the object is subjected to torque, the contact component and the object can rotate synchronously relative to the fixing component. Alternatively, the contact component is rotatably connected to the fixing component, and the contact component rolls in contact with the object. When the object is subjected to torque, the contact component rolls to support the rotation of the object, and both the contact component and the object can rotate relative to the fixing component. It can be understood that, in one scenario, the contact component is rotatably connected to the fixing component, and the contact component rolls in contact with the object. When the object is subjected to torque, the contact component rolls to support the rotation of the object, and both the contact component and the object can rotate relative to the fixing component. The adsorbed object can rotate relative to the fixed component, so the contact component supports the object by rolling, ensuring that the object and the contact component only have rolling contact. This effectively reduces the friction on the object, thus minimizing damage to the equipment when the user requires contact rotation, achieving the purpose of protecting the equipment. In another, even better scenario, the contact component is rotatably connected to the fixed component. When the adsorbed object is subjected to torque, the contact component and the adsorbed object can rotate synchronously relative to the fixed component, thus preventing relative displacement between the object and the contact component. This ensures that the contact component will not damage the adsorbed object when it is subjected to torque, guaranteeing the safety of the user's valuable equipment, reducing user safety concerns, and effectively improving the user experience.

[0013] According to some embodiments of the present invention, the magnetic suction element is disposed on the contact component.

[0014] The advantage of this invention is that by placing the magnetic attractor on the contact component, the distance between the magnetic attractor and the object being attracted is reduced, thereby enhancing the attraction effect of the magnetic attractor on the object being attracted.

[0015] According to some embodiments of the present invention, the magnetic attractant is disposed outside the contact component, and the magnetic attractant abuts against the object being attracted.

[0016] The advantage of this invention is that by setting the magnetic suction element outside the contact component or setting the contact component as a magnetic suction element, the magnetic suction element comes into contact with the object being attracted. It can be understood that the magnetic suction element is in direct contact with the object being attracted, eliminating the gap between the magnetic suction element and the object being attracted, thereby further enhancing the attraction effect of the magnetic suction element on the object being attracted.

[0017] According to some embodiments of the present invention, the magnetic attractant is disposed inside the contact component.

[0018] The advantage of this invention is that by placing the magnetic attractor inside the contact component, the contact component can cover the magnetic attractor, preventing the magnetic attractor from being exposed, and thus protecting the magnetic attractor from damage.

[0019] According to some embodiments of the present invention, the magnetic suction element is disposed on the fixing component.

[0020] The advantage is that by placing the magnetic suction component on the fixed component, the weight of the contact component is reduced, thereby making the rotation of the contact component and the fixed component smoother.

[0021] According to some embodiments of this utility model, the contacting component is rotatably connected to the fixing component, the contacting component has an abutting surface, the abutting surface abuts against the adsorbed object, when the adsorbed object tends to move, there is frictional resistance between the abutting surface and the adsorbed object, there is rotational damping force between the contacting component and the fixing component, and the rotational damping force between the contacting component and the fixing component is less than the maximum static friction force between the abutting surface and the adsorbed object.

[0022] The advantages of this invention are: by providing a contacting surface to the contacting component, which abuts against the adsorbed object, frictional resistance exists between the contacting surface and the adsorbed object when the adsorbed object tends to move. At the same time, a rotational damping force exists between the contacting component and the fixing component. The rotational damping force between the contacting component and the fixing component is less than the maximum static friction between the contacting surface and the adsorbed object. Thus, the frictional resistance between the contacting surface and the adsorbed object can prevent the adsorbed object from sliding against the contacting component, thereby achieving the effect of synchronous rotation between the adsorbed object and the contacting component.

[0023] According to some embodiments of the present invention, the contact component is configured as a rolling element, which rolls to support the adsorbed object; or, the contact component includes a body and a rolling element, which rolls to support the adsorbed object.

[0024] The advantages of this invention are that by setting the contact component as a rolling element, the contact component rolls to support the adsorbed object, or the contact component includes a body and a rolling element, the rolling element rolls to support the adsorbed object, so that when the adsorbed object is subjected to force, there is only rolling contact between the rolling element and the adsorbed object, thereby reducing the frictional force on the adsorbed object and reducing the damage to the adsorbed object by the contact component.

[0025] According to some embodiments of the present invention, the contact component is rotatably connected to the fixing component, and a limiting ring is provided on one of the fixing component and the contact component. The inner circular surface of the limiting ring cooperates with the other of the fixing component and the contact component to limit and prevent detachment.

[0026] The advantage of this invention is that by setting a limiting ring on one of the fixed component and the contact component, and the inner circular surface of the limiting ring cooperates with the other of the fixed component and the contact component to limit and prevent disengagement, the fixed component and the contact component can be limited to other relative positions except for relative rotation by the limiting ring, thereby making the relative movement between the fixed component and the contact component more stable.

[0027] According to some embodiments of the present invention, the contact component is rotatably connected to the fixing component, one of the fixing component and the contact component is provided with a limiting frustum, and the other of the fixing component and the contact component is provided with a circular groove. The outer circular surface of the limiting frustum cooperates with the inner wall of the circular groove and limits and prevents detachment.

[0028] The advantage of this invention is that by providing a limiting frustum on one of the fixed component and the contact component, and having a circular groove on the other of the fixed component and the contact component, the outer circular surface of the limiting frustum cooperates with the inner wall of the circular groove to limit and prevent disengagement. Thus, the relative positions between the fixed component and the contact component can be limited by the cooperation of the limiting frustum and the circular groove, except for relative rotation. In this way, the relative movement between the fixed component and the contact component is more stable.

[0029] According to some embodiments of the present invention, the contact component is rotatably connected to the fixing component, one of the fixing component and the contact component is provided with a limiting ring and a limiting frustum, and the other of the fixing component and the contact component is provided with an annular structure. The limiting ring and the limiting frustum respectively cooperate with the outer and inner circular surfaces of the annular structure to limit and prevent detachment.

[0030] The advantages of this invention are that by providing a limiting ring and a limiting frustum on one of the fixed component and the contact component, and setting the other of the fixed component and the contact component as an annular structure, the limiting ring and the limiting frustum respectively cooperate with the outer and inner circular surfaces of the annular structure to limit and prevent disengagement. Thus, the relative positions between the fixed component and the contact component can be limited by the cooperation of the limiting ring and the limiting frustum with the annular structure, except for relative rotation, thereby making the relative movement between the fixed component and the contact component more stable.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a magnetic fixing device according to an embodiment of the present utility model;

[0034] Figure 2 for Figure 1 The exploded view of the part is shown;

[0035] Figure 3 for Figure 1 The top view shown;

[0036] Figure 4 for Figure 3 The AA section view shown;

[0037] Figure 5 for Figure 4 The enlarged view at point B is shown.

[0038] Reference numerals: 100-fixed component, 110-contact component, 120-magnetic component, 130-limiting ring, 140-limiting frustum, 150-circular groove. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0040] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" and "second" are mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The following is in conjunction with the appendix Figure 1-5 This invention describes a magnetic fixing device according to an embodiment of the present invention.

[0044] This utility model aims to provide an embodiment of a magnetic fixing device.

[0045] Reference Figure 1 , Figure 2 and Figure 3 In this embodiment, a magnetic fixing device mainly includes a fixing component 100, a contact component 110, and a magnetic component 120.

[0046] Contact member 110 is used to abut against the adsorbed object.

[0047] The magnetic attractor 120 is disposed in one of the fixing member 100 and the contact member 110, and the magnetic attractor 120 is used to attract the object to be attracted.

[0048] Specifically, the magnetic attractor 120 can be an object that can generate magnetic force, such as a neodymium iron boron magnet or a ferrite magnet.

[0049] It should be explained that the magnetic attractor 120 is disposed on one of the fixing member 100 and the contact member 110. The magnetic attractor 120 can be disposed on one of the fixing member 100 and the contact member 110, that is, disposed on the outside of one of the fixing member 100 and the contact member 110. Alternatively, the magnetic attractor 120 can be disposed inside one of the fixing member 100 and the contact member 110. Or, one of the fixing member 100 and the contact member 110 can be set as the magnetic attractor 120.

[0050] In some specific embodiments, the magnetic attractor 120 is disposed on the contact member 110, thereby reducing the distance between the magnetic attractor 120 and the adsorbed object, and thus enhancing the adsorption effect of the magnetic attractor 120 on the adsorbed object.

[0051] Furthermore, the magnetic attractor 120 is disposed outside the contact member 110 or the contact member 110 is configured as the magnetic attractor 120, and the magnetic attractor 120 abuts against the attracted object.

[0052] It is understandable that the magnetic element 120 is in direct contact with the adsorbed object, eliminating the gap between the magnetic element 120 and the adsorbed object, thereby further enhancing the adsorption effect of the magnetic element 120 on the adsorbed object.

[0053] In other embodiments, the magnetic 120 is disposed inside the contact member 110, thereby allowing the contact member 110 to cover the magnetic 120, preventing the magnetic 120 from being exposed, and thus helping to protect the magnetic 120 from damage.

[0054] In some specific embodiments, the magnetic suction member 120 is disposed on the fixing member 100, thereby reducing the weight of the contact member 110 and making the rotation of the contact member 110 and the fixing member 100 smoother.

[0055] In some specific embodiments, the contact member 110 is rotatably connected to the fixed member 100. When the adsorbed object is subjected to torque, the contact member 110 and the adsorbed object can rotate synchronously relative to the fixed member 100. Alternatively, the contact member 110 is rotatably connected to the fixed member 100, and the contact member 110 is in rolling contact with the adsorbed object. When the adsorbed object is subjected to torque, the contact member 110 rolls to support the rotation of the contacted object, and the contact member 110 and the adsorbed object can rotate relative to the fixed member 100.

[0056] Understandably, in one scenario, the contact member 110 is rotatably connected to the fixing member 100, and the contact member 110 makes rolling contact with the adsorbed object. When the adsorbed object is subjected to torque, the contact member 110 rolls to support the rotation of the adsorbed object, and both the contact member 110 and the adsorbed object can rotate relative to the fixing member 100. Thus, by rolling to support the adsorbed object, the contact member 110 ensures that the adsorbed object and the contact member 110 only make rolling contact, effectively reducing the frictional force on the adsorbed object. Consequently, the magnetic fixing device can be used by the user with contact-based rotation. To minimize damage to equipment and protect it, in an even better scenario, the contact component 110 is rotatably connected to the fixed component 100. When the adsorbed object is subjected to torque, the contact component 110 and the adsorbed object can rotate synchronously relative to the fixed component 100. This prevents relative displacement between the adsorbed object and the contact component 110, thus ensuring that the contact component 110 will not damage the adsorbed object when it is subjected to torque. This ensures the safety of the user's valuable equipment, reduces the user's safety concerns, and effectively improves the user experience.

[0057] Reference Figure 4 and Figure 5 In some specific embodiments, the contact member 110 is rotatably connected to the fixed member 100. The contact member 110 has an abutment surface that abuts against the adsorbed object. When the adsorbed object tends to move, there is frictional resistance between the abutment surface and the adsorbed object. There is rotational damping force between the contact member 110 and the fixed member 100. The rotational damping force between the contact member 110 and the fixed member 100 is less than the maximum static friction between the abutment surface and the adsorbed object. Thus, the frictional resistance between the abutment surface and the adsorbed object can prevent the adsorbed object from sliding against the contact member 110, thereby achieving the effect of synchronous rotation between the adsorbed object and the contact member 110.

[0058] In some specific embodiments, the contact member 110 is rotatably connected to the fixed member 100. A limit ring 130 is provided on one of the fixed member 100 and the contact member 110. The inner circular surface of the limit ring 130 cooperates with the other of the fixed member 100 and the contact member 110 to limit and prevent disengagement. Thus, the fixed member 100 and the contact member 110 can be limited to other relative positions except for relative rotation by the limit ring 130, thereby making the relative movement between the fixed member 100 and the contact member 110 more stable.

[0059] Furthermore, the limiting ring 130 is provided on the fixed component 100, which helps to reduce the weight of the contact component 110 and makes the rotation of the contact component 110 easier.

[0060] In some specific embodiments, the inner circular surface of the limiting ring 130 has an inwardly protruding first protrusion. The inner circular surface of the limiting ring 130 can restrict the radial relative movement of the contact member 110 and the fixing member 100 along the rotation axis, and the first protrusion can restrict the axial relative movement of the contact member 110 and the fixing member 100 along the rotation axis.

[0061] Furthermore, the outer wall of one of the contact member 110 and the fixing member 100 that cooperates with the limiting ring 130 is provided with a second protrusion. The first protrusion and the second protrusion engage to restrict the axial relative movement of the contact member 110 and the fixing member 100 along the rotation axis.

[0062] In some specific embodiments, the contact member 110 is rotatably connected to the fixed member 100. One of the fixed member 100 and the contact member 110 is provided with a limiting frustum 140, and the other of the fixed member 100 and the contact member 110 is provided with a circular groove 150. The outer circular surface of the limiting frustum 140 cooperates with the inner wall of the circular groove 150 to limit and prevent disengagement. Thus, the fixed member 100 and the contact member 110 can be limited to other relative positions except for relative rotation by the cooperation of the limiting frustum 140 and the circular groove 150, thereby making the relative movement between the fixed member 100 and the contact member 110 smoother.

[0063] Furthermore, the limiting frustum 140 is disposed on the fixed component 100, and the contact component 110 has a circular groove 150, which helps to reduce the weight of the contact component 110 and makes the rotation of the contact component 110 easier.

[0064] In some specific embodiments, the outer circular surface of the limiting frustum 140 has an outwardly protruding third protrusion. The outer circular surface of the limiting frustum 140 can restrict the radial relative movement of the contact member 110 and the fixing member 100 along the rotation axis, and the third protrusion can restrict the axial relative movement of the contact member 110 and the fixing member 100 along the rotation axis.

[0065] Furthermore, the inner wall of the circular groove 150 is also provided with an inwardly protruding fourth protrusion, which engages with the third protrusion to restrict the relative axial movement of the contact member 110 and the fixing member 100 along the rotation axis.

[0066] In some specific embodiments, the contact member 110 is rotatably connected to the fixed member 100. One of the fixed member 100 and the contact member 110 is provided with a limiting ring 130 and a limiting frustum 140, and the other of the fixed member 100 and the contact member 110 is provided with an annular structure. The limiting ring 130 and the limiting frustum 140 respectively cooperate with the outer and inner circular surfaces of the annular structure to limit and prevent disengagement. Thus, the fixed member 100 and the contact member 110 can be limited to other relative positions except for relative rotation by the cooperation of the limiting ring 130 and the limiting frustum 140 with the annular structure, thereby making the relative movement between the fixed member 100 and the contact member 110 smoother.

[0067] Furthermore, the limiting ring 130 and the limiting frustum 140 are disposed on the fixed component 100, and the contact component 110 is configured as a ring structure, which helps to reduce the weight of the contact component 110 and makes the rotation of the contact component 110 more effortless.

[0068] In other embodiments, the contact member 110 is configured as a rolling element that rolls to support the adsorbed object. Alternatively, the contact member 110 may include a body and a rolling element that rolls to support the adsorbed object. Thus, when the adsorbed object is subjected to force, there is only rolling contact between the rolling element and the adsorbed object, thereby reducing the frictional force on the adsorbed object and reducing the damage to the adsorbed object caused by the contact member 110.

[0069] Specifically, the rolling element can be a ball or a roller.

[0070] In some specific embodiments, the fixing component 100 can be configured as a ring structure, which is beneficial for the lightweight design of the fixing component 100.

[0071] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The terms "first," "second," "third," "fourth," etc. (if applicable) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein.

[0073] It should also be noted that, in the description of this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0074] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may also include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or apparatus.

[0075] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A magnetic fixing device, characterized in that, include: Fixed component (100); Contact component (110) is used to abut against the adsorbed object; A magnetic attractor (120) is disposed in one of the fixing component (100) and the contact component (110) for attracting the adsorbed object; The contact component (110) is rotatably connected to the fixing component (100). When the adsorbed object is subjected to torque, the contact component (110) and the adsorbed object can rotate synchronously relative to the fixing component (100), or... The contact component (110) is rotatably connected to the fixing component (100). The contact component (110) makes rolling contact with the adsorbed object. When the adsorbed object is subjected to torque, the contact component (110) rolls to support the rotation of the adsorbed object. The contact component (110) and the adsorbed object can rotate relative to the fixing component (100).

2. The magnetic fixing device according to claim 1, characterized in that, The magnetic attractor (120) is disposed on the contact member (110).

3. The magnetic fixing device according to claim 2, characterized in that, The magnetic attractor (120) is disposed outside the contact member (110) or the contact member (110) is configured as the magnetic attractor (120), and the magnetic attractor (120) abuts against the attracted object.

4. A magnetic fixing device according to claim 2, characterized in that, The magnetic attractor (120) is disposed inside the contact member (110).

5. A magnetic fixing device according to claim 1, characterized in that, The magnetic suction element (120) is disposed on the fixing component (100).

6. The magnetic fixing device according to claim 1, characterized in that, The contact component (110) is rotatably connected to the fixing component (100). The contact component (110) has an abutting surface that abuts against the adsorbed object. When the adsorbed object tends to move, there is frictional resistance between the abutting surface and the adsorbed object. There is rotational damping force between the contact component (110) and the fixing component (100). The rotational damping force between the contact component (110) and the fixing component (100) is less than the maximum static friction force between the abutting surface and the adsorbed object.

7. The magnetic fixing device according to claim 1, characterized in that The contact member (110) is configured as a rolling element, which rolls to support the adsorbed object; or, the contact member (110) includes a body and a rolling element, which rolls to support the adsorbed object.

8. The magnetic fixing device according to claim 1, characterized in that The contact component (110) is rotatably connected to the fixing component (100). A limiting ring (130) is provided on one of the fixing component (100) and the contact component (110). The inner circular surface of the limiting ring (130) cooperates with the other of the fixing component (100) and the contact component (110) to limit and prevent detachment.

9. The magnetic fixing device according to claim 1, characterized in that, The contact component (110) is rotatably connected to the fixing component (100). One of the fixing component (100) and the contact component (110) is provided with a limiting frustum (140), and the other of the fixing component (100) and the contact component (110) has a circular groove (150). The outer circular surface of the limiting frustum (140) cooperates with the inner wall of the circular groove (150) to limit and prevent detachment.

10. The magnetic fixing device according to claim 1, characterized in that The contact component (110) is rotatably connected to the fixing component (100). One of the fixing component (100) and the contact component (110) is provided with a limiting ring (130) and a limiting frustum (140). The other of the fixing component (100) and the contact component (110) is configured as an annular structure. The limiting ring (130) and the limiting frustum (140) respectively cooperate with the outer and inner circular surfaces of the annular structure to limit and prevent detachment.

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