A foldable mechanism

Abstract

This application relates to a foldable mechanism, which includes a rotating component, a damping module, and a detection device. The damping module is connected to the rotating component and provides damping force to the foldable mechanism. The detection device is electrically connected to the rotating component and detects the number of times the foldable mechanism is opened and closed. The magnitude of the damping force provided by the damping module varies with the magnitude of the applied current, and the current applied to the damping module varies with the number of times the foldable mechanism is opened and closed. This reduces the possibility that the damping effect will decrease due to wear of the damping module after repeated opening and closing of the foldable mechanism.

Description

Technical Field

[0001] This application relates to the field of electronic device technology, and more particularly to a foldable mechanism. Background Technology

[0002] Currently, foldable screens are widely used in various electronic devices, enabling these devices to open and close. To improve the tactile experience when opening and closing foldable screens, the damping mechanism in foldable electronic devices is a cooperating cam structure that provides damping force during the opening and closing process. However, the cooperating cam structure in the damping mechanism suffers significant wear and tear after long-term use. Summary of the Invention

[0003] This application provides a foldable mechanism to solve the problem that the damping effect of the damping structure in foldable electronic devices is easily reduced due to wear.

[0004] This application provides a foldable mechanism, which includes:

[0005] Rotating component;

[0006] A damping module, wherein the damping module is connected to the rotating assembly;

[0007] The detection device is electrically connected to the rotating assembly;

[0008] The detection device is used to detect the number of times the foldable mechanism is opened and closed. The current flowing into the damping module can vary with the number of times the foldable mechanism is opened and closed, and the damping force provided by the damping module can vary with the current flowing into the damping module.

[0009] The damping module provides damping force to the foldable mechanism. The magnitude of the damping force is controlled by the current supplied to the damping module, allowing the foldable mechanism to start and stop at any position. The detection device detects the number of times the foldable mechanism is opened and closed. Based on the number of opening and closing operations, the current supplied to the damping module can be adjusted so that the foldable mechanism receives approximately the same damping force after multiple opening and closing operations. This helps reduce the possibility of wear on the damping module due to repeated opening and closing operations, thus minimizing the damping effect.

[0010] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the foldable mechanism provided in the embodiments of this application;

[0012] Figure 2This is a schematic diagram of the structure of a first embodiment of the foldable mechanism provided in this application;

[0013] Figure 3 A top view of Embodiment 1 of the foldable mechanism provided in this application;

[0014] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0015] Figure 5 for Figure 3 A magnified view of the area at position I in the middle;

[0016] Figure 6 for Figure 3 A magnified view of a portion of position II;

[0017] Figure 7 This is a schematic diagram of the structure of the mid-frame support provided in an embodiment of this application;

[0018] Figure 8 This is a schematic diagram of the structure of the first rotating component in Embodiment 1 of this application;

[0019] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the foldable mechanism provided in this application.

[0020] Figure label:

[0021] 1-Rotating assembly;

[0022] 11-First rotating component

[0023] 111-Limiting groove;

[0024] 112 - Connecting part;

[0025] 112a - Second limit block;

[0026] 12-Second rotating component;

[0027] 13-Second Cam;

[0028] 131 - Second protrusion;

[0029] 2-Damping module;

[0030] 21-Magnetorheological fluid damper;

[0031] 22-First magnetic component;

[0032] 23-Second magnetic component;

[0033] 24-First Cam;

[0034] 241 - First protrusion;

[0035] 25 - Elastic element;

[0036] 3-Mid-frame bracket;

[0037] 31-Installation Department;

[0038] 311 - First limit block;

[0039] 312 - Mounting slot;

[0040] 32-Positioning Post;

[0041] 4-Middle frame;

[0042] 41-Positioning groove.

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0044] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0045] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0046] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0047] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0048] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0049] like Figures 1 to 9 As shown in the figure, this application provides a foldable mechanism, including a rotating component 1, a damping module 2, and a detection device. The damping module 2 is connected to the rotating component 1 and is used to provide damping force to the rotating component 1. The detection device is electrically connected to the rotating component 1 and is used to detect the number of times the foldable mechanism is opened and closed. The magnitude of the current supplied to the damping module 2 can vary with the number of times the foldable mechanism is opened and closed, and the damping force provided by the damping module 2 can vary with the magnitude of the current supplied to the damping module 2.

[0050] Foldable mechanisms can be applied to foldable electronic devices with flexible screens. The flexible screen is mounted on the foldable mechanism, which can control the flexible screen to unfold or fold. When the flexible screen is folded, the elasticity of the flexible screen itself will generate a rebound force on the folding mechanism.

[0051] The damping module 2 is connected to the rotating component 1, providing damping force during the opening and closing process of the foldable mechanism to counteract the rebound force of the flexible screen, allowing the foldable mechanism to hover freely. The current flowing through the damping module 2 is adjusted according to the number of openings and closings of the foldable mechanism, thereby controlling the magnitude of the damping force provided by the damping module 2. This ensures that the foldable mechanism experiences approximately the same damping force after multiple openings and closings, reducing the impact of repeated openings and closings on the damping effect of the damping module 2 on the foldable mechanism.

[0052] In one possible embodiment, the detection device can not only detect the number of folds of the foldable mechanism, but also detect the real-time temperature of the flexible screen and the timing parameters of a single bend / close. The electronic device equipped with the foldable mechanism has a built-in algorithm that can control the current supplied to the damping module 2 through the above-mentioned measurement parameters, thereby changing the damping force provided by the damping module 2 to offset the difference in bending force caused by the flexible screen under different temperatures / static creep, so that the bending feel of the electronic device equipped with the foldable mechanism remains consistent under different conditions.

[0053] like Figure 1 As shown, in one possible embodiment, the foldable mechanism further includes a middle frame 4, which is mounted on a middle frame support 3. The middle frame support 3 has multiple positioning posts 32, and the side of the middle frame 4 facing the middle frame support 3 has positioning grooves 41 corresponding to the positioning posts 32. The cooperation between the positioning posts 32 and the positioning grooves 41 restricts the relative position between the middle frame 4 and the middle frame support 3, reducing the possibility of movement of the middle frame 4 relative to the middle frame support 3. The flexible screen is connected to the middle frame 4, and the folding area of ​​the flexible screen overlaps with the rotating component 1, while the non-folding area overlaps with the middle frame 4, causing the middle frame 4 to drive the flexible screen to fold or unfold.

[0054] like Figure 2 , Figure 3and Figure 4 As shown, in one possible embodiment, the foldable mechanism further includes a mid-frame support 3, and the rotating assembly 1 includes a first rotating member 11, one end of which extends into the mid-frame support 3. When the foldable mechanism is folded or unfolded, the first rotating member 11 slides relative to the mid-frame support 3. The damping module 2 includes a first magnetic member 22 and a second magnetic member 23. The first magnetic member 22 is mounted on the mid-frame support 3, and the second magnetic member 23 is mounted on the side of the first rotating member 11 near the first magnetic member 22. Along the thickness direction Z of the foldable mechanism, the first magnetic member 22 and the second magnetic member 23 overlap and have opposite polarities.

[0055] After one end of the first rotating member 11 extends into the middle frame support 3, along the thickness direction Z of the foldable mechanism, the first rotating member 11 will contact the middle frame support 3, enabling the middle frame support 3 and the first rotating member 11 to rotate synchronously. Along the width direction X of the foldable mechanism, the rotation axes of the first rotating member 11 and the middle frame support 3 are located on two parallel straight lines. When the foldable mechanism is opened and closed, the end of the first rotating member 11 extending into the middle frame support 3 will slide relative to the middle frame support 3.

[0056] The first magnetic element 22 mounted on the middle frame bracket 3 and the second magnetic element 23 mounted on the first rotating element 11 overlap and have opposite polarities. This creates a repulsive force between the first rotating element 11 and the side of the middle frame bracket 3 where the first magnetic element 22 is mounted. This increases the friction between the first rotating element 11 and the surface of the mounting bracket opposite to the side where the first magnetic element 22 is mounted. The friction between the first rotating element 11 and the mounting bracket provides damping force for the opening and closing process of the foldable mechanism. The damping force generated at the end of the first rotating element 11 extending into the middle frame bracket 3 increases the lever arm of the damping force, thereby improving the effect of the damping module 2 and reducing wear on the first rotating element 11 and / or the mounting bracket. The large contact area between the first rotating element 11 and the middle frame bracket 3 reduces the possibility of wear.

[0057] like Figure 4 and Figure 8 As shown, in one possible embodiment, the first rotating member 11 is provided with a limiting groove 111, and the second magnetic member 23 is located in the limiting groove 111.

[0058] The limiting groove 111 can be located on the surface of the first rotating member 11 facing the first magnetic member 22, and the second limiting groove 111 overlaps with the first magnetic member 22 along the thickness direction Z of the foldable mechanism.

[0059] During the opening and closing of the foldable mechanism, the end of the first rotating member 11 that extends into the middle frame support 3 will slide relative to the middle frame support 3. The limiting groove 111 can restrict the relative position between the second magnetic member 23 and the first rotating member 11, so that the second magnetic member 23 can move with the first rotating member 11 relative to the middle frame support 3, reducing the possibility of displacement of the second magnetic member 23 relative to the first rotating member 11, which is beneficial to improving the stability of the foldable mechanism.

[0060] like Figure 4 As shown, in one possible embodiment, the second magnetic element 23 moves within the coverage area of ​​the first magnetic element 22 along the thickness direction Z of the foldable structure.

[0061] During the opening and closing process of the foldable mechanism, the second magnetic element 23 will move relative to the first magnetic element 22 along with the first rotating element 11. The surface areas of the first magnetic element 22 and the second magnetic element 23 are significantly different, so that the second magnetic element 23 is always within the coverage area of ​​the first magnetic element 22 during the movement relative to the first magnetic element 22.

[0062] During the opening and closing of the foldable mechanism, the first magnetic element 22 and the second magnetic element 23 can always overlap each other, so that there is always a mutual repulsive force between the first magnetic element 22 and the second magnetic element 23, which can provide damping force during the opening and closing of the foldable mechanism, and the foldable mechanism can start and stop at any angle.

[0063] like Figure 2 , Figure 3 and Figure 4 As shown, in one possible embodiment, at least one of the first magnetic element 22 and the second magnetic element 23 is an electromagnet.

[0064] In one possible embodiment, the first magnetic element 22 can be an electromagnet, and the second magnetic element 23 can be a permanent magnet. By changing the magnitude of the current flowing through the first magnetic element 22, the magnetic force of the first magnetic element 22 can be changed, thereby changing the magnitude of the interaction force between the first magnetic element 22 and the second magnetic element 23.

[0065] During the opening and closing of the foldable mechanism, the relative positions between the first magnetic component 22 and the second magnetic component 23 change, causing a change in the interaction force between them. By adjusting the current flowing through the electromagnet, the interaction force between the first magnetic component 22 and the second magnetic component 23 can be adjusted, reducing the impact of their relative movement on the friction between the first rotating component 11 and the middle frame support 3. This improves the stability of the foldable mechanism during opening and closing. After multiple opening and closing operations or in different usage scenarios, adjusting the current flowing through the electromagnet based on data detected by the detection device can further reduce the influence of external conditions on the foldable mechanism.

[0066] like Figure 4 , Figure 7 and Figure 8 As shown, in one possible embodiment, the middle frame bracket 3 includes a mounting portion 31, the first rotating member 11 includes a connecting portion 112, at least a portion of the connecting portion 112 extends into the mounting portion 31 along the thickness direction Z of the foldable mechanism, the connecting portion 112 contacts the inner wall of the mounting portion 31, and the first magnetic member 22 and the second magnetic member 23 are both located on the side away from the connecting portion 112 and the mounting portion 31.

[0067] The mounting part 31 may include two mounting slots 312 arranged opposite to each other. Along the length direction Y of the foldable mechanism, the two sides of the connecting part 112 are respectively located in the two mounting slots 312 and in contact with the inner wall of the mounting slots 312. The two mounting slots 312 can restrict the relative position of the first rotating member 11 and the middle frame support 3 along the length direction Y and thickness direction Z of the foldable mechanism, so that the middle frame support 3 and the first rotating member 11 can rotate synchronously.

[0068] Along the thickness direction Z of the foldable mechanism, the limiting groove 111 can be provided on the upper surface of the connecting part 112, the second limiting member is located in the limiting groove 111, and the first magnetic member 22 can be fixed in the middle frame bracket 3 on the side corresponding to the second magnetic member 23, so that the friction generated between the side of the connecting part 112 without the second magnetic member 23 and the inner wall of the mounting groove 312 provides damping force for the folding mechanism.

[0069] like Figure 7 and Figure 8 As shown, in one possible embodiment, the mounting part 31 includes a first limiting block 311, and the connecting part 112 includes a second limiting block 112a. When the foldable mechanism is in the unfolded state, the first limiting block 311 and the second limiting block 112a abut against each other.

[0070] The first limiting block 311 protrudes from the mounting part 31, the second limiting block 112a protrudes from the connecting part 112, and the second limiting block 112a is located on the side of the first limiting block 311 close to the rotation axis of the first rotating member 11. When the foldable mechanism is in the unfolded state, the first limiting block 311 and the second limiting block 112a abut against each other.

[0071] The rotation axes of the mid-frame bracket 3 and the first rotating member 11 are located on two parallel straight lines. When the foldable mechanism is opened and closed, the connecting part 112 will move relative to the mounting part 31. Since the second limiting block 112a is located on the side of the first limiting block 311 close to the rotation axis of the first rotating member 11, during the folding process of the foldable mechanism, the first limiting block 311 and the second limiting block 112a move away from each other. During the unfolding process of the foldable mechanism, the first limiting block 311 and the second limiting block 112a move closer to each other. After the foldable mechanism is fully unfolded, the first limiting block 311 and the second limiting block 112a abut against each other, restricting the relative position of the mounting part 31 and the connecting part 112, reducing the possibility of the foldable mechanism continuing to deform along the unfolding direction, and helping to reduce the possibility of damage to the flexible screen or other structures in electronic devices.

[0072] like Figure 2 As shown, in one possible embodiment, the foldable mechanism further includes a second rotating member 12, with the middle frame bracket 3 mounted on the second rotating member 12, and the rotation axis of the first rotating member 11 and the rotation axis of the second rotating member 12 being parallel to each other.

[0073] Along the length Y of the foldable mechanism, the first rotating member 11 and the second rotating member 12 are arranged in sequence. The middle frame support 3 is rotatably connected to the second rotating member 12, so that the middle frame support 3 and the second rotating member 12 can rotate synchronously. The end of the second rotating member 12 away from the middle frame support 3 is provided with the rotation axis of the second rotating member 12. The rotation axis of the second rotating member 12 is parallel to the rotation axis of the first rotating member 11. Along the width X of the foldable mechanism, the rotation axis of the second rotating member 12 is located on the side of the rotation axis of the first rotating member 11 away from the middle frame support 3.

[0074] The second limiting block 112a in the connector is located on the side of the first limiting block 311 in the middle frame bracket 3 near the rotation axis of the first rotating member 11. It can restrict the middle frame bracket 3 from moving towards the rotation axis of the first rotating member 11, but cannot restrict the middle frame bracket 3 from moving away from the rotation axis of the first rotating member 11. The rotatable connection between the second rotating member 12 and the middle frame bracket 3 can restrict the position of the middle frame bracket 3 along the width direction X of the foldable mechanism, reducing the possibility of the middle frame bracket 3 detaching from the first rotating member 11, which is beneficial to improving the reliability of the foldable mechanism.

[0075] In one possible embodiment, the rotation shaft of the first rotating member 11 and the rotation shaft of the second rotating member 12 are connected by meshing gears. During the opening and closing of the foldable mechanism, the meshing gears cause the rotation shafts of the first rotating member 11 and the second rotating member 12 to rotate synchronously, which helps to improve the stability of the foldable mechanism during the opening and closing process.

[0076] like Figure 1 and Figure 2 As shown, in one possible embodiment, the foldable mechanism includes at least two rotating components 1, a mid-frame support 3, and a mid-frame 4. The two rotating components 1 are symmetrically arranged along the width direction X of the foldable mechanism, with the axis of symmetry being the centerline of the width direction X. Simultaneously, the two rotating components 1 are respectively connected to the corresponding mid-frame support 3 and mid-frame 4, allowing the flexible screen mounted on the mid-frame 4 to include two non-folding areas, with the folding area located between the two non-folding areas. This increases the area of ​​the flexible screen and improves the display effect of the electronic device.

[0077] like Figure 9 As shown, in one possible embodiment, the damping module 2 includes a magnetorheological fluid damper 21, and the rotating component 1 is located inside the magnetorheological fluid damper 21. During the process of the foldable mechanism switching between the folded state and the unfolded state once, the current flowing through the magnetorheological fluid damper 21 remains unchanged.

[0078] The magnetorheological fluid damper 21 is filled with magnetorheological fluid. The flow rate of the magnetorheological fluid can be controlled by controlling the magnitude of the current flowing into the magnetorheological fluid damper 21. The rotating component 1 is located inside the magnetorheological fluid damper 21, and the side of the rotating component 1 closest to the rotating shaft can contact the magnetorheological fluid.

[0079] As the fluidity of the magnetorheological fluid decreases, the resistance of the magnetorheological fluid to the rotation of the rotating component 1 increases, thereby increasing the damping force provided by the magnetorheological fluid damper 21 to the foldable mechanism. The electronic device equipped with the foldable mechanism can control the magnitude of the current flowing through the magnetorheological fluid damper 21 based on data detected by the detection device, enabling the foldable mechanism to start and stop at any angle. Simultaneously, it ensures that the damping force experienced by the folding mechanism is similar during multiple folds, reducing wear on the foldable mechanism or the impact of external environmental factors on the opening and closing process. During a single fold, the current flowing through the magnetorheological fluid damper 21 remains constant, and the damping force provided by the magnetorheological fluid damper 21 is greater than or equal to the rebound force of the flexible screen on the folding mechanism, allowing the foldable mechanism to start and stop at any angle and simplifying the procedure for controlling the current flowing through the magnetorheological fluid damper 21.

[0080] like Figure 5 and Figure 8As shown, in one possible embodiment, the damping module 2 further includes a first cam 24, which is coaxially arranged with the rotating component 1. A second cam 13 is provided on the side of the rotating component 1 facing the first cam 24. When the foldable mechanism is in an unfolded or folded state, the first cam 24 and the second cam 13 mesh with each other.

[0081] The first cam 24 has a first protrusion 241 spaced apart on the side facing the second cam 13, and the second cam 13 has a second protrusion 131 spaced apart on the side facing the first cam 24. When the foldable mechanism is in the unfolded or folded state, the first protrusion 241 and the adjacent second protrusion 131 are positioned between each other. The first cam 24 is coaxially arranged with the first rotating member 11, and the second cam 13 rotates relative to the first cam 24 during the opening and closing of the foldable mechanism.

[0082] When the second cam 13 rotates relative to the first cam 24, friction is generated between the sidewall of the first protrusion 241 and the sidewall of the second protrusion 131, providing damping force for the foldable mechanism. During the rotation of the second cam 13 relative to the first cam 24, the contact area between the first protrusion 241 and the second protrusion 131 gradually decreases, resulting in a greater damping force on the foldable mechanism when it begins to unfold or fold than during the opening and closing process. This improves the bending feel of the foldable mechanism and enhances the user experience.

[0083] like Figure 3 and Figure 5 As shown, in one possible embodiment, the damping module 2 includes an elastic element 25 located on the side of the first cam 24 away from the rotating assembly 1.

[0084] The first cam 24 can be sleeved on the rotation shaft of the first rotating member 11 and can move along the length direction Y of the rotation shaft. When the second cam 13 rotates relative to the first cam 24, the sidewalls of the first protrusion 241 and the second protrusion 131 slide relative to each other, so that the first protrusion 241 moves from the gap between the adjacent second protrusions 131 to the top of the second protrusion 131. The second cam 13 continues to rotate relative to the first cam 24, so that the first protrusion 241 moves from the top of the second protrusion 131 to the bottom of the first protrusion 241.

[0085] When the first protrusion 241 moves from the gap between the adjacent second protrusion 131 to the top of the second protrusion 131, the second rotating member 12 drives the first cam 24 to move away from the first rotating member 11. The first cam 24 compresses the elastic member 25, and the elastic force of the elastic member 25 drives the first cam 24 to move closer to the first rotating member 11, so that the first protrusion 241 moves from the top of the second protrusion 131 to the bottom of the first protrusion 241. At the same time, the elastic member 25 can also increase the friction between the first cam 24 and the second cam 13, thereby increasing the damping force on the folding mechanism.

[0086] In one possible embodiment, no current is passed through the damping module 2 when the foldable mechanism is in a folded or unfolded state.

[0087] The damping module 2 controls the magnitude of the damping force provided to the foldable mechanism by the magnitude of the current. When no current is applied to the damping module 2, the damping force provided to the foldable mechanism by the damping module 2 will be at its minimum value.

[0088] The foldable mechanism includes a first cam 24 and a second cam 13 that cooperate with each other. When the foldable mechanism is in the folded or unfolded state, the first cam 24 and the second cam 13 mesh with each other, providing damping force to maintain the foldable mechanism in its current state. Therefore, when the foldable mechanism is in the folded or unfolded state, no current needs to be supplied to the damping module 2, reducing the energy consumption of the foldable mechanism and improving the battery life of the electronic device. During the opening and closing process of the foldable mechanism, the damping force provided by the first cam 24 and the second cam 13 gradually decreases. Supplying current to the damping module 2 can increase the damping force on the foldable mechanism, enabling the foldable mechanism to start and stop at any position.

[0089] This application provides a foldable mechanism, which includes a rotating component 1, a damping module 2, and a detection device. The damping module 2 is connected to the rotating component 1 and provides damping force to the foldable mechanism. The detection device is electrically connected to the rotating component 1 and detects the number of times the foldable mechanism is opened and closed. The magnitude of the damping force provided by the damping module 2 varies with the magnitude of the applied current, and the current applied to the damping module 2 varies with the number of times the foldable mechanism is opened and closed. This reduces the possibility that the damping effect will decrease due to wear and tear on the damping module 2 after repeated opening and closing of the foldable mechanism.

[0090] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A foldable mechanism, characterized in that, The foldable mechanism includes: Rotating component (1); Damping module (2), the damping module (2) is connected to the rotating assembly (1); A detection device, which is electrically connected to the rotating assembly (1); The detection device is used to detect the number of times the foldable mechanism is opened and closed. The current supplied to the damping module (2) can vary with the number of times the foldable mechanism is opened and closed. The damping force provided by the damping module (2) can vary with the current supplied to the damping module (2). The foldable mechanism further includes a middle frame support (3), and the rotating component (1) includes a first rotating member (11), one end of which extends into the middle frame support (3). When the foldable mechanism is folded or unfolded, the first rotating member (11) slides relative to the middle frame support (3). The damping module (2) includes a first magnetic element (22) and a second magnetic element (23). The first magnetic element (22) is mounted on the middle frame bracket (3), and the second magnetic element (23) is mounted on the side of the first rotating member (11) near the first magnetic element (22). Along the thickness direction of the foldable mechanism, the first magnetic element (22) and the second magnetic element (23) overlap and have opposite polarities.

2. The foldable mechanism according to claim 1, characterized in that, The damping module (2) includes a magnetorheological fluid damper (21), and the rotating component (1) is located inside the magnetorheological fluid damper (21). During the process of the foldable mechanism switching between the folded state and the unfolded state, the current flowing through the magnetorheological fluid damper (21) remains unchanged.

3. The foldable mechanism according to claim 1, characterized in that, At least one of the first magnetic element (22) and the second magnetic element (23) is an electromagnet.

4. The foldable mechanism according to claim 1, characterized in that, The first rotating component (11) is provided with a limiting groove (111), and the second magnetic component (23) is located in the limiting groove (111).

5. The foldable mechanism according to claim 1, characterized in that, Along the thickness direction of the foldable mechanism, the second magnetic element (23) moves within the coverage area of ​​the first magnetic element (22).

6. The foldable mechanism according to claim 1, characterized in that, The middle frame bracket (3) includes a mounting part (31), the first rotating member (11) includes a connecting part (112), at least a portion of the connecting part (112) extends into the mounting part (31), the connecting part (112) contacts the inner wall of the mounting part (31) along the thickness direction of the foldable mechanism, and the first magnetic member (22) and the second magnetic member (23) are both located on the side away from the contact between the connecting part (112) and the mounting part (31).

7. The foldable mechanism according to claim 6, characterized in that, The mounting part (31) includes a first limiting block (311), and the connecting part (112) includes a second limiting block (112a). When the foldable mechanism is in the unfolded state, the first limiting block (311) and the second limiting block (112a) abut against each other.

8. The foldable mechanism according to claim 1, characterized in that, The foldable mechanism also includes a second rotating component (12), and the middle frame bracket (3) is mounted on the second rotating component (12). The rotation axis of the first rotating component (11) and the rotation axis of the second rotating component (12) are parallel to each other.

9. The foldable mechanism according to any one of claims 1 to 8, characterized in that, The damping module (2) further includes a first cam (24), which is coaxially arranged with the rotating component (1). The rotating component (1) has a second cam (13) on the side facing the first cam (24). When the foldable mechanism is in an unfolded or folded state, the first cam (24) and the second cam (13) mesh with each other.

10. The foldable mechanism according to claim 9, characterized in that, The damping module (2) includes an elastic element (25) located on the side of the first cam (24) away from the rotating assembly (1).

11. The foldable mechanism according to any one of claims 1 to 8, characterized in that, When the foldable mechanism is in a folded or unfolded state, no current is passed through the damping module (2).

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