Rotary shaft mechanism, foldable device and preparation method for rotary shaft mechanism

Abstract

The present application belongs to the field of structural forming. Provided is a rotary shaft mechanism (110), which aims to solve the problem of the relatively low relative position accuracy of swing arms and door plates of known rotary shaft mechanisms. The rotary shaft mechanism (110) comprises a base (111) and a swing arm and door plate member (115), wherein the swing arm and door plate member (115) is rotatably connected to the base (111); the swing arm and door plate member (115) comprises a first forming portion (11) and a second forming portion (12), which are integrally formed; the first forming portion (11) is provided with a plurality of connecting holes (K1), separation portions (16) being provided between adjacent connecting holes (K1); and the second forming portion (12) comprises a body portion (14) and a plurality of connecting portions (15) connected to the body portion (14), separation slots (C1) being provided between adjacent connecting portions (15), the plurality of connection portions (15) being respectively formed in the plurality of connecting holes (K1), and the separation slots (C1) matching the separation portions (16). A swing arm (113) and a door plate (112) of the rotary shaft mechanism (110) are reliably combined and have relatively high relative position accuracy. Further provided are a foldable device (100) and a preparation method for the rotary shaft mechanism (110).

Description

Rotating shaft mechanism, foldable device and manufacturing method of rotating shaft mechanism

[0001] Cross-references to related patents

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on November 13, 2023, with application number 202311519390.9 and application name “Hinge mechanism, foldable device and method for preparing a rotating shaft mechanism”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of structural forming, and in particular to a hinge mechanism, a foldable device, and a method for preparing the hinge mechanism. Background Art

[0004] The hinge mechanism is the primary structure that enables folding in foldable devices like foldable phones. It consists of a door panel and a swing arm. The door panel supports the foldable device's flexible screen, while the swing arm forms a revolving pair with other structures, enabling relative rotation.

[0005] In some known hinge mechanisms, the door panel and swing arm are separately machined and then connected through welding, bonding, or other methods. However, this method makes it difficult to maintain the relative position of the swing arm and door panel, which can cause the swing arm to become stuck in the rotational coordination with other components, affecting the user experience of the hinge mechanism.

[0006] Summary of the Invention

[0007] The present application provides a pivot mechanism, a foldable device and a method for preparing the pivot mechanism to solve the problem that it is difficult to ensure the relative position accuracy of the swing arm and the door panel in the swing arm door panel of the known pivot mechanism.

[0008] In the first aspect, an embodiment of the present application provides a pivot mechanism, comprising a base and a swing arm door panel, the swing arm door panel being rotatably connected to the base; the swing arm door panel comprising a first formed portion and a second formed portion formed as one piece; the first formed portion is provided with a plurality of connecting holes, and a partition portion is provided between adjacent connecting holes; the second formed portion comprises a main body portion and a plurality of connecting portions connected to the main body portion, and a partition groove is provided between adjacent connecting portions; the plurality of connecting portions are respectively formed in the plurality of connecting holes, and the partition grooves cooperate with the partition portions.

[0009] The first molded portion and the second molded portion of the swing arm door panel of the pivot mechanism in this embodiment are molded on both sides of the partition through the spaced connecting portion, and can be shrunk respectively with the partition as the reference, ensuring the accuracy of the relative position of the connecting portion and the door panel, which is conducive to ensuring the structural accuracy of the molded swing arm door panel, ensuring the precise fit between the swing arm door panel and the base or other components, and ensuring that the pivot mechanism rotates smoothly without jamming.

[0010] In one possible embodiment, the first shaped portion has a first surface on the side facing the second shaped portion. The first surface is provided with a boss, and the connection hole is located inside the outer contour of the boss. The second shaped portion has a second surface, which is provided with a groove. The connection portion is projected from the bottom surface of the groove. The boss and the groove mate, and the projections of the boss and the groove on a plane parallel to the first surface are non-circular.

[0011] In this embodiment, when the first and second molded parts are integrated, the non-circular boss and groove cooperate to further limit the displacement of the second molded part relative to the first molded part within a plane parallel to the first surface, as well as the rotation of both about an axis parallel to the first direction. Furthermore, the boss thickens the thickness of the first molded part where it connects to the second molded part, improving the structural strength and rigidity at that location and reducing the likelihood of deformation or damage to the first molded part at that location. Furthermore, the second molded part is provided with a groove to accommodate the boss, reducing the overall structural dimension occupied along the thickness direction, facilitating a compact design.

[0012] In a possible embodiment, a concave hole is provided on the bottom surface of the groove at a position corresponding to the dividing groove, and a convex column is provided on the boss at a position corresponding to the dividing portion, and the convex column cooperates with the concave hole.

[0013] In this embodiment, the cooperation between the recessed hole and the protrusion enables positioning and fastening of the first and second molded parts, further enhancing the secure bond between the first and second molded parts. Furthermore, when the second molded part is overmolded onto the first molded part, the shrinkage of the second molded part's material causes the material surrounding the recessed hole to shrink and wrap around the protrusion, further enhancing the secure bond between the second molded part and the first molded part.

[0014] In a possible embodiment, the projections of the boss and the groove in a plane parallel to the first surface are polygonal, and at least some of the corners of the polygon are rounded or chamfered.

[0015] In this embodiment, the polygonal bosses and grooves can achieve mutual limitation in the second and third directions and limit rotation around an axis parallel to the first direction. Rounded corners or chamfered transitions are set at the corners, which can reduce stress concentration at the corners and reduce the problem of deformation and cracking at the corners.

[0016] In one possible embodiment, the first molded portion has a first surface, and the connecting hole includes a first hole segment and a second hole segment. The first hole segment is recessed from the first surface, and the second hole segment is connected to the end of the first hole segment away from the first surface. The second hole segment has a larger cross-section than the first hole segment. The second molded portion has a second surface, and the connecting portion includes a first connecting segment and a second connecting segment. The first connecting segment is protruding from the second surface of the main body, and the second connecting segment is connected to the end of the first connecting segment away from the main body. The first connecting segment cooperates with the first hole segment, and the second connecting segment cooperates with the second hole segment.

[0017] In this embodiment, the main body and the T-shaped connecting portion are connected to form an I-shape. When the door panel and the swing arm are secondary molded, the molding material of the swing arm shrinks along the first direction to form a clamping force, which will make the part sandwiched between the main body and the second connecting section of the I-shaped second molding part reliably combined with the first molding part, ensuring the firmness of the combination between the two, and being able to reliably limit the displacement of the second molding part relative to the first molding part along the first direction, thereby improving the integrity and structural dimensional accuracy of the two.

[0018] In a possible embodiment, the edges of both end surfaces of the first hole segment in the depth direction are provided with rounded corners or chamfered transitions; and / or the edges of the second hole segment near one end of the first hole segment are provided with rounded corners or chamfered transitions.

[0019] In this embodiment, by making a rounded or chamfered transition at the edge lines of the first hole segment and the second hole segment, on the one hand, the contact and joining area between the connecting portion and the connecting hole can be increased, and on the other hand, the stress concentration at the corner can be reduced, thereby reducing the problem of shrinkage and cracking of the formed swing arm door panel at the joint.

[0020] In one possible embodiment, the depth direction of the connection hole is along the first direction, and the multiple connection holes are spaced apart along the second direction. A strip portion is connected between two side surfaces of the connection hole along the second direction, and the strip portion is located on the side of the connection hole along the first direction closer to the second shaped portion. The connection portion is provided with a strip hole, and the strip portion cooperates with the strip hole.

[0021] In this embodiment, the second molded portion, which is secondary molded onto the first molded portion, has its strip-shaped hole and its side hole surfaces surrounding the strip portion, thereby limiting the first molded portion in the first direction and the third direction (the third direction is perpendicular to the first and second directions). At the same time, the connection portion and the connection hole are limited along the end surface of the second direction, which can achieve the second molded portion and the first molded portion to be limited in the second direction. In addition, the strip portion along the second direction is provided in combination with the second molded portion to achieve positioning and guidance of the first and second molded portions in the second direction, ensuring directional consistency in the second direction after the two are combined.

[0022] In a possible implementation, the length direction of the door panel is the second direction, and the connecting hole is in the shape of a long strip extending along the second direction.

[0023] In this embodiment, by making the connecting hole an elongated strip along the second direction, the cooperation between the connecting hole and the connecting part can limit the rotation of the second molding part relative to the first molding part around an axis parallel to the first direction, thereby ensuring the consistency of the relative directions of the first molding part and the second molding part, and ensuring the dimensional accuracy and degree of integration of the first molding part of the second molding part.

[0024] In a possible embodiment, the first molded part includes a door panel, and the second molded part includes a swing arm.

[0025] In this embodiment, the swing arm door panel is divided into a door panel and a swing arm.

[0026] In one possible embodiment, the thickness direction of the door panel is a first direction, and the length direction of the door panel is a second direction. The door panel has a first surface perpendicular to the first direction and a boss protruding from the first surface. The door panel has two connecting holes spaced apart along a second direction, with a partition between the two connecting holes. The connecting holes are located inwardly of the outer contour of the boss and extend through the door panel along the thickness direction. A boss is provided on the boss at a position corresponding to the partition. The swing arm includes a main body and two connecting parts. The main body includes a rotating arm configured to rotatably engage with a base. The main body has a second surface, which includes a groove recessed inwardly from the second surface. The two connecting parts are respectively protruding from the bottom surface of the groove, and the two connecting parts are spaced apart along the second direction, with a partition between the two connecting parts. The bottom surface of the partition is provided with a recessed hole. The swing arm is integrally formed with the door panel through secondary molding, with the second surface superimposed on the first surface. The boss mates with the groove, the boss mates with the recessed hole, and the two connecting parts mate with the two connecting holes, respectively. The two connecting parts are sandwiched between the partition and the boss.

[0027] In this embodiment, the integrity and relative position accuracy of the door panel and the swing arm can be greatly improved by coordinating the bosses and grooves, the bosses and recessed holes, the two connecting parts and the two connecting holes, and the partition as the forming reference of the two connecting parts.

[0028] In one possible embodiment, the swing arm door panel member includes multiple sub-structural segments, each sub-structural segment includes a door panel segment and a swing arm, the door panel segment extends along the second direction, and the multiple door panel segments are connected along the second direction; the first forming portion includes a part of the multiple sub-structural segments, and the second forming portion includes another part of the multiple sub-structural segments.

[0029] In this embodiment, the swing arm door panel is divided into a plurality of sub-structural segments, which is suitable for forming a swing arm door panel with a longer length.

[0030] In one possible embodiment, there are three sub-structural segments, the sub-structural segment located in the middle is the first sub-structural segment, and the two sub-structural segments located on both sides are the second sub-structural segments; the first forming portion includes the first sub-structural segment, and the second forming portion includes the second sub-structural segment; the door panel segment of the first sub-structural segment is provided with a first overlapping segment at both ends along the second direction, and the thickness of the first overlapping segment is less than the thickness of the door panel; the first overlapping segment is provided with two connecting holes, the two connecting holes are spaced along the second direction, and there is a partition between the two connecting holes; the door panel segment of the second sub-structural segment is provided with a second overlapping segment near one end of the first sub-structural segment, and the second overlapping segment is provided with two connecting parts on the surface of one side facing the first overlapping segment, the two connecting parts are spaced along the second direction, and there is a partition groove between the two connecting parts; the second overlapping segment overlaps with the first overlapping segment along the thickness direction, and the two connecting parts are respectively matched with the two connecting holes, the partition is matched with the partition groove, and the two connecting parts are respectively clamped on both sides of the partition.

[0031] In this embodiment, the integrity and relative position accuracy of the multiple sub-structure segments can be greatly improved by cooperating between the two connecting portions and the two connecting holes and using the partition portion as a forming reference for the two connecting portions.

[0032] In a second aspect, embodiments of the present application provide a foldable device comprising a middle frame, a flexible screen, and the aforementioned hinge mechanism. The middle frame is rotatably connected to a swing arm door panel; the flexible screen covers the middle frame and the hinge mechanism and is supported by the swing arm door panel.

[0033] The foldable device in this embodiment adopts the aforementioned hinge mechanism, which has high structural strength, dimensional accuracy and high degree of integration.

[0034] In a third aspect, an embodiment of the present application provides a method for preparing a rotating shaft mechanism, which is used to prepare the aforementioned rotating shaft mechanism. The method for preparing the rotating shaft mechanism includes preparing a swing arm door panel. The preparation of the swing arm door panel includes:

[0035] preparing a first molded part;

[0036] A second molded portion is formed on the first molded portion through a secondary molding process, so that the second molded portion and the first molded portion are molded into an integrated swing arm door panel, and adjacent connecting portions of the molded second molded portion are clamped on both sides of the partition portion.

[0037] In the preparation method of the rotating shaft mechanism in this embodiment, the second molded part is molded on the first molded part, and the two are combined through multiple connecting holes and multiple connecting parts, which can achieve mutual limitation and high bonding strength. In addition, the cooperation of the strip-shaped connecting holes and the connecting parts can limit the second molded part from rotating relative to the first molded part around an axis parallel to the first direction, thereby ensuring the consistency of the relative directions of the first molded part and the second molded part, and ensuring the dimensional accuracy and degree of integration of the rotating shaft mechanism.

[0038] In one possible implementation,

[0039] The first forming part includes a door panel, and the second forming part includes a swing arm; the door panel is formed first, and then the swing arm is secondary formed on the door panel, or,

[0040] The swing arm door panel component includes multiple sub-structural segments, each sub-structural segment includes a door panel segment and a swing arm, the door panel segment extends along the second direction, and the multiple door panel segments are connected along the second direction; the first forming part includes a part of the multiple sub-structural segments, and the second forming part includes another part of the multiple sub-structural segments; the sub-structural segment of the first forming part is formed first, and then the sub-structural segment of the second forming part is formed on the sub-structural segment of the first forming part.

[0041] In this embodiment, the swing arm door panel can be divided and formed in two different ways.

[0042] In a possible embodiment, the molding material used for the second molding part is MIM metal, amorphous metal, plastic or Peek material, and the second molding part is integrally molded on the first molding part through MIM process, amorphous molding process or injection molding process.

[0043] In this embodiment, the first molded portion can be formed using various materials and various secondary molding processes.

[0044] In one possible embodiment, the molding material used for the first molding part is MIM metal, stamping metal, 3D printing metal or amorphous metal, and the first molding part is formed by MIM process, 3D printing molding process, punching and forging molding process, CNC machining process or amorphous molding process.

[0045] In this embodiment, the first molded portion can be made of various materials and various molding processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0047] FIG1 is a three-dimensional view of a foldable device when unfolded according to an embodiment of the present application;

[0048] FIG2 is a three-dimensional view of the foldable device of FIG1 when folded;

[0049] FIG3 is a cross-sectional view of the foldable device of FIG1 along line AA;

[0050] FIG4 is a cross-sectional view of the foldable device of FIG2 along line BB;

[0051] FIG5 is a structural diagram of a swing arm door panel according to an embodiment of the present application;

[0052] FIG6 is a structural diagram of a door panel according to an embodiment of the present application;

[0053] FIG7 is a structural diagram of a swing arm according to an embodiment of the present application;

[0054] FIG8 is an enlarged view of point C in FIG7 ;

[0055] FIG9 is a bottom view of FIG8;

[0056] FIG10 is a cross-sectional view of the junction of the door panel of FIG6 and the swing arm of FIG7;

[0057] FIG11 is a partial view of another embodiment of the door panel of the present application;

[0058] FIG12 is a cross-sectional view along line DD in FIG11;

[0059] FIG13 is a structural diagram of another embodiment of the swing arm of the present application;

[0060] FIG14 is a partial view of yet another embodiment of a door panel according to an embodiment of the present application;

[0061] FIG15 is a bottom view of FIG14;

[0062] FIG16 is a cross-sectional view of the junction of the swing arm of FIG13 and the door panel of FIG14 or FIG15;

[0063] FIG17 is a schematic diagram of another division form of the swing arm door panel according to an embodiment of the present application;

[0064] FIG18 is an expanded view of the connection between adjacent substructure segments in FIG17;

[0065] FIG19 is a cross-sectional view of the connection between adjacent substructure segments in FIG17 .

[0066] Description of the main component symbols: Foldable device 100 First middle frame 101 Second middle frame 102 Flexible screen 103 Rotating shaft mechanism 110 Base 111 Door panel 112 Swing arm 113 Swing arm door panel 115 First forming part 11 Second forming part 12 Rotating arm 13 Main body 14 Connecting part 15 Partitioning part 16 Boss 17 Boss 18 Fillet 19 Chamfer 20 Strip portion 21 Substructure segment 22 First substructure segment 22a Second substructure segment 22b Door panel segment 23 First overlapping segment 24a Second overlapping segment 24b First connecting segment 25 Second connecting segment 26 Connecting hole K1 First hole segment K2 Second hole segment K3 Concave hole K4 Strip hole K5 Partitioning groove C1 Concave groove C2 First direction Z Second direction X Third direction Y First surface P1 Second surface P2 DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0068] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an element centered thereon. When an element is considered to be "disposed on" another element, it may be directly disposed on the other element or there may also be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the relevant listed items.

[0070] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0071] Example

[0072] Foldable devices, such as some foldable mobile phones and tablet computers, are folded or unfolded through a hinge mechanism.

[0073] Figures 1 and 2 show a foldable device 100, which is specifically a foldable mobile phone. The foldable device 100 mainly includes two middle frames (named as the first middle frame 101 and the second middle frame 102 respectively), a flexible screen 103 and a hinge mechanism 110. The first middle frame 101 and the second middle frame 102 are respectively connected to the two sides of the hinge mechanism 110, and the flexible screen 103 covers the first middle frame 101, the hinge mechanism 110 and the second middle frame 102. Through the hinge mechanism 110, the first middle frame 101 and the second middle frame 102 of the foldable device 100 can be relatively unfolded or folded, while driving the flexible screen 103 to unfold or fold. Please refer to Figure 1 for the unfolded state of the foldable device 100, and please refer to Figure 2 for the folded state.

[0074] The foldable device 100 shown in Figures 1 and 2 is an outward-folding device, that is, the flexible screen 103 is located outside the first middle frame 101 and the second middle frame 102 after folding. In other embodiments, the foldable device 100 can also be an inward-folding device, that is, the flexible screen 103 is located between the first middle frame 101 and the second middle frame 102 after folding.

[0075] In other embodiments, the foldable device 100 may also be a device that can be folded twice or more, which is not limited here.

[0076] 3 and 4 , in this embodiment, the hinge mechanism 110 includes a base 111 and two swing arm door panels 115 . The two swing arm door panels 115 are respectively connected to both sides of the base 111 and are used to respectively connect the first middle frame 101 and the second middle frame 102 .

[0077] Referring to Figure 5 , the swing arm door panel 115 in this embodiment has an integrated door panel 112 and a swing arm 113 . The swing arm 113 is used to rotatably cooperate with the base 111 , and the door panel 112 is used to support the flexible screen 103 of the foldable device 100 .

[0078] In this embodiment, the swing arm door panel 115 rotates with the middle frame and the base 111 to form a rotating pair. Through these rotating pairs, when the flexible screen 103 is in the unfolded state (see Figure 3), the two door panels 112 coplanarly support the unfolded flexible screen 103; when the flexible screen 103 is in the folded state (see Figure 4), the two door panels 112 rotate a certain angle relative to the base 111, thereby reliably supporting the bent flexible screen 103, which is conducive to adapting to the support of the flexible screen 103 in different states.

[0079] Referring again to Figure 5 , in this embodiment, the swing arm door panel 115 includes a door panel 112 and multiple swing arms 113 (three in the figure). The door panel 112 is an elongated, plate-like structure extending along the second direction X, with its thickness along the first direction Z. The door panel 112 is used to support the flexible screen 103. Multiple swing arms 113 are formed on the door panel 112 at intervals along the second direction X, forming a revolving pair with other components.

[0080] The swing arm 113 in FIG5 is a double-rotation swing arm, which is formed integrally from two swing arm parts. One side of the double-rotation swing arm is used for rotationally connecting to the base 111 , and the other side is used for rotationally connecting to the first middle frame 101 / the second middle frame 102 , thereby forming two rotation pairs.

[0081] The swing arm door panel 115 shown in FIG5 is used as a single structural component for the hinge mechanism 110, which can reduce the number of assembled parts of the hinge mechanism 110 and reduce the impact of assembly errors between the door panel 112 and the swing arm 113 on the rotation accuracy of the hinge mechanism 110. Furthermore, through integrated molding, the thickness of the hinge mechanism 110 caused by the additional connection between the door panel 112 and the swing arm 113 can be reduced, which facilitates the thinning design of the hinge mechanism 110 and the overall thickness of the foldable device 100.

[0082] In some known technologies, the swing arm and door panel of the pivot mechanism are formed separately and then connected. That is, the door panel and swing arm are first formed separately, and then the door panel and the swing arm are connected together by welding or gluing. This method of connecting the swing arm and door panel separately after forming requires high precision of the individual parts, especially the dimensions of the connection points of the individual parts need to be precisely adapted, which results in high manufacturing costs. In addition, the connection method of welding or gluing makes it difficult to ensure the relative position accuracy between the individual parts, making it difficult to ensure the accuracy of the rotational pairs on both sides of the swing arm and door panel combination structure. The assembled pivot mechanism is prone to jamming, affecting the yield of the pivot mechanism.

[0083] The swing arm door panel 115 shown in FIG5 can be constructed as an integral structural member from two or more molded parts. For example, the swing arm door panel 115 includes two molded parts, namely, a first molded part 11 and a second molded part 12. The division of the first molded part 11 and the second molded part 12 of the swing arm door panel 115 can be determined as needed.

[0084] For example, Figures 6 to 10 show a first division method of the swing arm door panel 115; Figures 17 to 19 show another division method of the swing arm door panel 115, which will be introduced below respectively.

[0085] 6 and 7 , in this embodiment, the first molded portion 11 of the swing arm door panel 115 is the door panel 112 in FIG. 7 , and the second molded portion 12 is the swing arm 113 in FIG. 6 .

[0086] When manufacturing the swing arm door panel 115, the door panel 112 can be formed first, and then three swing arms 113 can be formed on the door panel 112 through secondary molding, thereby forming an integrated swing arm door panel 115; or the three swing arms 113 can be formed first, and then the door panel 112 can be formed on the three swing arms 113 through secondary molding, thereby forming an integrated swing arm door panel 115.

[0087] In other embodiments, the number of the swing arms 113 may also be set to other numbers as needed, which is not limited here.

[0088] In other embodiments, the swing arm 113 may also include only one side of the swing arm portion, so that it only forms one rotation pair. The swing arm 113 may also be replaced by other structures attached to the door panel 112.

[0089] In order to ensure the reliable combination of the door panel 112 and the swing arm 113, in this embodiment, parts for cooperating with each other are respectively provided on the door panel 112 and the swing arm 113.

[0090] 8 and 9 , the door panel 112 is a long strip-shaped plate-like structure. The side surface of the door panel 112 facing the swing arm 113 along the thickness direction (i.e., the first direction Z) is the first surface P1, and the boss 17 is protruding from the first surface P1. The shape of the outer contour of the boss 17 in the plane parallel to the first surface P1 is non-circular, for example, a polygon. The door panel 112 is provided with two connecting holes K1 in the part inside the outer contour of the boss 17, and the two connecting holes K1 pass through the door panel 112 along the first direction Z respectively. The two connecting holes K1 are spaced apart along the length direction of the door panel 112 (i.e., the second direction X), so that a partition 16 is defined between the two connecting holes K1. Optionally, adjacent connecting holes K1 are staggered along the width direction of the door panel 112 (i.e., the third direction Y).

[0091] The boss 17 is provided with a boss 18 at a position corresponding to the partition 16. Optionally, the maximum dimension of the boss 18 is set within 1.0 mm. The boss 18 can be a cylindrical, prism or special-shaped columnar structure.

[0092] In this embodiment, the connecting hole K1 includes a first hole segment K2 and a second hole segment K3. The first hole segment K2 is recessed from the first surface P1, and the second hole segment K3 is connected to the end of the first hole segment K2 away from the first surface P1. The cross-section of the second hole segment K3 is larger than that of the first hole segment K2, so that the connecting hole K1 is T-shaped. The shapes of the first hole segment K2 and the second hole segment K3 can be the same or different. For example, as shown in Figures 8 and 9, the first hole segment K2 is an oval shape, and the second hole segment K3 is a combination of a rectangle and a single semicircle.

[0093] Correspondingly, the swing arm 113 shown in Figure 6 includes a main body 14 and two connecting portions 15. The main body 14 includes two rotating arms 13, which are respectively rotatably engaged with the base 111 and the middle frame. The main body 14 has a second surface P2 and a groove C2 recessed from the second surface P2. The two connecting portions 15 are respectively projected from the bottom surface of the groove C2. The two connecting portions 15 are spaced apart along the second direction X, defining a partition groove C1 between the two connecting portions 15. The bottom surface of the partition groove C1 is provided with an inwardly concave hole K4.

[0094] The connecting portion 15 is T-shaped (see FIG10 ), and the connecting portion 15 and the main body 14 form an I-shaped structure. The connecting portion 15 includes a first connecting segment 25 and a second connecting segment 26. The first connecting segment 25 is connected to the main body 14, and the second connecting segment 26 is connected to the end of the first connecting segment 25 away from the main body 14.

[0095] FIG. 10 shows a state where the swing arm 113 of FIG. 6 is integrally formed with the door panel 112 of FIG. 7 to FIG. 9 .

[0096] Referring to Figure 10 , the swing arm 113 is integrally formed with the door panel 112 through secondary molding. The second surface P2 overlaps the first surface P1, the boss 17 fits into the groove C2, the boss 18 fits into the recessed hole K4, and the two connecting portions 15 fit into the two connecting holes K1, respectively. The two connecting portions 15 are sandwiched between the partition 16 and the boss 18. Specifically, the first connecting segment 25 of the connecting portion 15 fits into the first hole segment K2 of the connecting hole K1, and the second connecting segment 26 of the connecting portion 15 fits into the second hole segment K3 of the connecting hole K1.

[0097] In the swing arm door panel 115, the connecting portion 15 fits into the connecting hole K1, so that the swing arm 113 and the door panel 112 are integrated into one body and form a mutual limit, ensuring a reliable connection between the door panel 112 and the swing arm 113. The I-shaped structure formed by the main body 14 and the T-shaped connecting portion 15 is used to match the door panel 112. When the swing arm 113 is secondary molded on the door panel 112, the molding material of the swing arm 113 shrinks along the first direction Z to form a clamping force, which will reliably connect the portion sandwiched between the second surface P2 of the swing arm 113 and the second connecting section 26 to the door panel 112, ensuring the firmness of the connection between the two, and reliably limiting the displacement of the swing arm 113 relative to the door panel 112 along the first direction Z, thereby improving the integrity and structural dimensional accuracy of the two.

[0098] For the embodiment in which the connecting hole K1 is in the shape of an elongated strip extending along the length direction of the door panel 112 (i.e., the second direction X), the cooperation between the connecting hole K1 and the connecting portion 15 can limit the rotation of the swing arm 113 relative to the door panel 112 around an axis parallel to the first direction Z, thereby ensuring the consistency of the relative directions of the door panel 112 and the swing arm 113, and ensuring the dimensional accuracy and degree of integration of the swing arm door panel 115.

[0099] By using two spaced connection holes K1 to fit the two connection parts 15 of the swing arm 113, the connection reliability between the swing arm 113 and the door panel 112 can be further improved. At the same time, the partition 16 between the connection holes K1 fits in the partition groove C1, which can further enhance the limiting effect of the door panel 112 on the swing arm 113 along the second direction X. In addition, the partition 16 located in the middle can limit the displacement of the swing arm 113 to the left or right relative to the door panel 112 along the second direction X, and the limiting effect is better. At the same time, the connection parts 15 on both sides are formed on both sides of the partition 16. During the molding process, they can be shrunk based on the partition 16, ensuring the relative position of the connection parts 15 and the door panel 112 is accurate, which is conducive to ensuring the structural accuracy of the molded swing arm door panel 115, ensuring the precise fit between the swing arm door panel 115 and the base 111 or its frame, and ensuring that the rotating shaft mechanism 110 rotates smoothly and is not easily stuck.

[0100] The coordinated positioning of the polygonal boss 17 and the groove C2 further limits the displacement of the swing arm 113 relative to the door panel 112 in the second direction X or the third direction Y, as well as the rotation of both about an axis parallel to the first direction Z. Furthermore, the provision of the boss 17 increases the thickness of the door panel 112 where it connects to the swing arm 113, improving the structural strength and rigidity of this area and reducing the likelihood of deformation or damage to the door panel 112. Furthermore, the provision of the groove C2 in the swing arm 113 to accommodate the boss 17 reduces the overall structural dimension along the thickness direction, facilitating a compact design.

[0101] The cooperation between the recessed hole K4 and the protruding column 18 enables positioning and fastening of the door panel 112 and the swing arm 113 in the second direction X and the third direction Y, further enhancing the secure connection between the door panel 112 and the swing arm 113. Furthermore, when the swing arm 113 is overmolded onto the door panel 112, the material of the swing arm 113 shrinks, causing the material surrounding the recessed hole K4 to shrink, wrapping around the protruding column 18 in the second direction X and the third direction Y, further enhancing the secure connection between the swing arm 113 and the door panel 112.

[0102] The staggered arrangement of adjacent connection holes K1 along the third direction Y increases the overall fit between the swing arm 113 and the door panel 112 in the third direction Y. Furthermore, the non-collinear staggered arrangement reduces the degree of rotation of the two connection portions 15 about their centers when collinear, thereby improving the relative positional reliability of the swing arm 113 and the door panel 112.

[0103] From the above description, it can be seen that the swing arm door panel 115 shown in Figures 7 to 10, in addition to the mutual connection between the door panel 112 and the swing arm 113 through the material bonding force of the contact interface between the two, can also ensure the relative position accuracy of the two and make the two hold each other tightly through the mutual limiting structure and rotation limiting structure between the door panel 112 and the swing arm 113 in the first direction Z, the second direction X, and the third direction Y.

[0104] In addition, for the implementation method of first forming the door panel 112 and then secondary molding the swing arm 113 on the door panel 112, the partition 16 and the boss 18 on the first-formed door panel 112 can be used as the molding reference of the swing arm 113, so that when the swing arm 113 is secondary molded, the two connecting parts 15 of the swing arm 113 are contracted toward each other with the partition 16 as the reference, thereby ensuring the relative position accuracy between the swing arm 113 and the door panel 112 after molding.

[0105] Manufacturing the swing arm door panel 115 by secondary molding can also reduce the design requirements for dimensional accuracy at the joint surface between the door panel 112 and the swing arm 113.

[0106] Figures 11 and 12 show another embodiment of a door panel 112. The door panel 112 in Figures 11 and 12 differs from the door panel 112 in Figures 8-9 mainly in the following two aspects:

[0107] First, in the door panel 112 of Figures 11 and 12 , the corners of the polygonal boss 17 are rounded or chamfered 20. The rounded or chamfered corners 19 and 20 increase the contact and engagement area between the boss 17 and the groove C2, while also reducing stress concentration at the corners, thereby minimizing the risk of shrinkage and cracking at the joints of the formed swing arm door panel 115.

[0108] Secondly, in the door panel 112 of Figures 11 and 12 , the edges of the first hole segment K2 at both end surfaces along the first direction Z are provided with fillets 19 or chamfers 20 for transition. The edges of the second hole segment K3 near one end of the first hole segment K2 along the first direction Z are provided with fillets 19 or chamfers for transition. The fillets 19 or chamfers 20 increase the contact and engagement area between the connecting portion 15 and the connecting hole K1 while also reducing stress concentration at the corners, thereby alleviating the risk of shrinkage and cracking at the joints of the formed swing arm door panel 115.

[0109] The door panel 112 and the swing arm 113 shown in FIG. 13 to FIG. 16 adopt a combination structure different from that adopted by the door panel 112 and the swing arm 113 in FIG. 7 to FIG. 10 .

[0110] Referring to Figures 14 and 15 , the door panel 112 defines two connection holes K1 spaced apart along the second direction X. These connection holes K1 are straight holes, for example, holes with rectangular cross-sections whose lengths extend along the second direction X. A partition 16 is defined between the two connection holes K1. A strip 21 extends between the two side faces of the connection holes K1 along the second direction X. The strip 21 is an elongated structure extending along the second direction X and is located on the side closest to the swing arm 113 along the first direction Z.

[0111] Correspondingly, referring to FIG13 , the swing arm 113 includes a main body 14 and two connecting portions 15 . The two connecting portions 15 are spaced apart from each other along the second direction X and are integrally formed with the main body 14 . A separation slot C1 is defined between the two connecting portions 15 . The connecting portions 15 are rectangular block-shaped structures and have a strip-shaped hole K5 extending along the second direction X.

[0112] Referring to Figure 16 , the strip hole K5 fits the strip portion 21, the connecting portion 15 engages the connecting hole K1, and the partition groove C1 engages the partition portion 16. The swing arm 113, which is overmolded into the door panel 112, has its strip hole K5 on each side surface surrounding the strip portion 21, thereby limiting its position on the door panel 112 in the first direction Z and the third direction Y. Simultaneously, the end surfaces of the connecting portion 15 and the connecting hole K1 along the second direction X limit the swing arm 113 and the door panel 112 in the second direction X. Furthermore, the strip portion 21, which is arranged along the second direction X, is combined with the swing arm 113 to achieve positioning and guidance of the door panel 112 and the swing arm 113 in the second direction X, ensuring directional consistency along the second direction X after the two are combined. Optionally, the cross-section of the strip portion 21 in a plane perpendicular to the second direction X is square, which can limit the swing arm 113 from rotating relative to the door panel 112 around a rotation axis parallel to the second direction X, thereby ensuring the integrity and firmness of the door panel 112 and the swing arm 113.

[0113] At the same time, in the embodiment shown in Figures 13 to 16, the door panel 112 can also be provided with a boss 18 to cooperate with the recessed hole K4 of the swing arm 113. For details, please refer to the corresponding descriptions of Figures 7 to 10, which will not be repeated here.

[0114] 17 to 19 show a second division form of the swing arm door panel 115 of FIG. 5 .

[0115] Referring to FIG. 17 , the swing arm door panel 115 includes a plurality of sub-segments 22 (e.g., three sub-segments 22 shown in FIG. 17 ). The sub-segments 22 include a door panel segment 23 and a swing arm 113 integrally provided on the door panel segment 23. The door panel segment 23 and the swing arm 113 can be integrally formed using the same material, such as by casting, 3D printing, etc., or can be secondary molded using the same or different materials. The plurality of door panel segments 23 are combined along the second direction X to form the swing arm door panel 115 shown in FIG. 5 . One of the adjacent sub-segments 22 serves as the first molded portion 11, and the other serves as the second molded portion 12.

[0116] For example, in Figure 17, the middle sub-segment 22 is the first sub-segment 22a, and the sub-segments 22 on both sides are the second sub-segments 22b. The first sub-segment 22a is formed first as the first molded portion 11, and the second sub-segment 22b is formed on the first sub-segment 22a through a secondary molding process as the second molded portion 12.

[0117] The connection between the door panel segment 23 of the first sub-segment 22 a and the door panel segment 23 of the second sub-segment 22 b is shown in FIG. 18 and FIG. 19 .

[0118] 18 and 19 , a first overlapping section 24a is provided at the end of the door panel section 23 of the first substructure section 22a along the second direction X. The thickness of the first overlapping section 24a is less than the thickness of the door panel section 23. The first overlapping section 24a is provided with two connecting holes K1, and the two connecting holes K1 are spaced apart along the second direction X, and a partition 16 is defined between the two connecting holes K1.

[0119] A second overlapping section 24b is provided at one end of the door panel section 23 of the second sub-structure section 22b close to the first sub-structure section 22a. Two connecting portions 15 are protruding from a surface of the second overlapping section 24b facing the first overlapping section 24a. The two connecting portions 15 are spaced apart along the second direction X and define a separation groove C1 therebetween.

[0120] The second overlapping section 24 b overlaps with the first overlapping section 24 a along the thickness direction, and the two connecting portions 15 are respectively matched with the two connecting holes K1 , the partitioning portion 16 is matched with the partitioning groove C1 , and the two connecting portions 15 are respectively clamped on both sides of the partitioning portion 16 .

[0121] Optionally, the total thickness (dimension along the first direction Z) of the two first overlapping sections 24a and the second overlapping section 24b after overlapping is equal to the thickness of the door panel section 23. In this way, the thickness of the door panel 112 of the formed swing arm door panel 115 remains consistent in the length direction.

[0122] The shapes of the connection hole K1 and the connection portion 15 in this embodiment can refer to the embodiments shown in Figures 7 to 10. That is, the connection hole K1 in this embodiment can be configured as a T-shaped hole, and correspondingly, the connection portion 15 is T-shaped to fit the connection hole K1, and the connection portion 15 and the second overlapping section 24b are connected to form an I-shaped structure.

[0123] The connecting portion 15 and the second overlapping section 24b are connected to form an I-shape. Combined with the T-shaped connecting hole K1, the first and second overlapping sections 24a, 24b can reliably limit each other in the first direction Z, the second direction X, and the third direction Y, ensuring that the swing arm door panel 115 formed by the combination of the two has a high degree of integrity and structural precision. When the second overlapping section 24b and the connecting portion 15 are formed into the first sub-segment 22a through a secondary molding process, they can also hold the other sub-segment 22 tightly through material shrinkage, further improving the reliability of the connection between the two.

[0124] In other embodiments, the connecting hole K1 may also be a tapered hole, and correspondingly, the connecting portion 15 may be an inverted cone. The cooperation between the tapered hole and the inverted cone facilitates the first overlapping section 24a and the second overlapping section 24b to be tightly embraced with each other.

[0125] In this embodiment, the swing arm door panel 115 is formed by integrally forming the first molding part 11 and the second molding part 12. In addition to being used for the aforementioned swing arm door panel 115, it can also be used for the door panel, shaft cover, support plate or other structures of the foldable device 100, and can also be used for structural parts of other products, which is not limited here.

[0126] This embodiment also provides a method for preparing a rotating shaft mechanism, which is used to prepare the aforementioned rotating shaft mechanism 110 .

[0127] With reference to the above figures, the method for preparing the rotating shaft mechanism 110 in this embodiment includes:

[0128] preparing a first molded portion 11;

[0129] The second molded portion 12 is secondary molded on the first molded portion 11 so that the second molded portion 12 and the first molded portion 11 are molded into an integrated swing arm door panel 115 , and the adjacent connecting portions 15 of the molded second molded portion 12 are clamped on both sides of the partition portion 16 .

[0130] Optionally, the first molding portion 11 is formed by a MIM (Metal Injection Molding) process, a 3D printing molding process, a punching molding process, a CNC (Computer Numerical Control) processing process, or an amorphous molding process; the molding material used for the first molding portion 11 is a MIM metal, a stamping metal, a 3D printing metal, or an amorphous metal;

[0131] Optionally, the second molding part 12 is integrally formed on the first molding part 11 by MIM process, amorphous molding process or injection molding process; the molding material used for the second molding part 12 is MIM metal, amorphous metal, plastic or Peek (polyetheretherketone) material.

[0132] The swing arm door panel 115 can be made by multiple molding methods. According to the division of each molding part and the molding order, a variety of preparation methods can be selected, which will be exemplarily introduced below.

[0133] The first preparation method:

[0134] The swing arm door panel 115 is divided into a door panel 112 and a plurality of swing arms 113. The door panel 112 of the swing arm door panel 115 is formed as the first molded part 11 through a single molding process; the swing arms 113 are formed as the second molded part 12 on the door panel 112 through a secondary molding process, thereby forming an integrated swing arm door panel 115.

[0135] In a single-shot molding process, the door panel 112 can be made of materials such as stainless steel and titanium alloy, and can be formed using methods such as MIM molding, 3D printing, precision casting, CNC machining after punching and forging, and amorphous molding. The structure of the door panel 112 used to connect with the swing arm 113 (such as the aforementioned connection hole K1) can be directly formed on the door panel 112 during the single-shot molding process, or can be processed on the door panel 112 through a post-processing process (such as CNC machining) after the single-shot molding process.

[0136] In the secondary molding, the swing arm 113 can be formed on the door panel 112 by secondary MIM molding, secondary vacuum die casting, secondary injection molding, etc. The material of the secondary molding can be the same as or different from the material of the primary molding.

[0137] Combined with the cooperation of the aforementioned I-shaped swing arm 113 and the door panel 112 with the T-shaped connecting hole K1, as well as the structural design of the double connecting part 15, the boss 17, the boss 18, etc., after the swing arm 113 is formed on the door panel 112, a double-hole positioning column staggered structure is formed between the swing arm 113 and the door panel 112, which can realize the mutual positioning and connection in the first direction Z, the second direction X and the third direction Y, and can also realize the function of preventing relative rotation energy. The two connecting parts 15 of the formed swing arm 113 are respectively contracted based on the partition 16, so that a swing arm door panel 115 with high reliability and precision can be obtained.

[0138] The second preparation method:

[0139] Compared with the first preparation method, the molding order of the door panel 112 and the swing arm 113 is changed, and multiple swing arms 113 are molded once as the first molding part 11; then the door panel 112 as the second molding part 12 is obtained by secondary molding on the multiple swing arms 113, thereby obtaining an integrated swing arm door panel 115.

[0140] The third preparation method:

[0141] Compared to the first preparation method, the division method of the swing arm door panel 115 is changed, and the swing arm door panel 115 is divided into multiple sub-structural segments 22 along the length direction (i.e., the second direction X). First, one or more sub-structural segments 22 (defined as first sub-structural segments 22a) are molded at a time. Then, based on the molded sub-structural segments 22, the remaining sub-structural segments 22 (defined as second sub-structural segments 22b) are secondary molded. For example, using the method shown in Figure 17, the swing arm door panel 115 is divided into three sub-structural segments 22. During the primary molding process, the middle sub-structural segment 22 (i.e., the first sub-structural segment 22a) is molded first. Then, the left sub-structural segment 22 (i.e., the second sub-structural segment 22b) and the right sub-structural segment 22 (i.e., the second sub-structural segment 22b) are secondary molded on the middle sub-structural segment 22, thereby obtaining a unified swing arm door panel 115. The terms "left," "middle," and "right" here refer to the state shown in Figure 17.

[0142] The adjacent first sub-structure segment 22a and the second sub-structure segment 22b are connected through the two connecting holes K1 of the first overlapping segment 24a and the two connecting portions 15 of the second overlapping segment 24b, thereby achieving reliable connection. A clear dividing line may exist at the connection position.

[0143] The one-step molding may adopt the MIM process, and the length (dimension along the second direction X) of the obtained first substructure segment 22a may be limited to less than 70.0 mm.

[0144] The preparation method is applicable to a swing arm door panel 115 having a length greater than 60.0 mm.

[0145] When the thickness of the swing arm door panel 115 is small and cannot be layered into the first overlapping section 24a and the second overlapping section 24b in terms of thickness, the long end faces of the first sub-structure section 22a and the second sub-structure section 22b can be directly combined, and then the combination strength can be strengthened by additional welding or the like.

[0146] In other embodiments, the swing arm door panel 115 may be manufactured using other methods, such as single-shot molding of materials such as stainless steel, titanium alloy, or zirconium-based amorphous alloy, resulting in the swing arm door panel 115 having no distinct boundaries or interfaces. Single-shot molding methods may include MIM molding, amorphous molding, 3D printing, precision casting, and the like.

[0147] Based on the above description, the pivot mechanism 110 in the embodiment of the present application has a high bonding strength between the first molded part 11 and the second molded part 12, and the adjacent connecting part 15 of the second molded part 12 is secondary molded by using the partition part 16 of the first molded part 11 as a reference, which can ensure a higher relative position accuracy between the swing arm 113 and the door panel 112, which is conducive to the smooth rotation coordination of the pivot mechanism 110 and other structures without getting stuck.

[0148] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A rotating shaft mechanism, characterized in that: It comprises a base and a swing arm door panel, wherein the swing arm door panel is rotatably connected to the base; The swing arm door panel comprises a first molded portion and a second molded portion that are integrally molded; The first forming portion is provided with a plurality of connecting holes, and a partition portion is provided between adjacent connecting holes; The second molding part includes a main body and a plurality of connecting parts connected to the main body, and a partition groove is provided between adjacent connecting parts; the plurality of connecting parts are respectively molded in the plurality of connecting holes, and the partition groove cooperates with the partition part.

2. The rotating shaft mechanism according to claim 1, characterized in that: A surface of the first forming portion facing the second forming portion is a first surface, a boss is provided on the first surface, and the connecting hole is located inside the outer contour of the boss; The second molding portion has a second surface, the second surface is provided with a groove, and the connecting portion is convexly arranged on the bottom surface of the groove; The boss matches the groove, and projections of the boss and the groove in a plane parallel to the first surface are non-circular.

3. The rotating shaft mechanism according to claim 2, characterized in that: A concave hole is provided on the bottom surface of the groove corresponding to the position of the dividing groove; The boss is provided at a position corresponding to the partition portion, and the boss matches the concave hole.

4. The rotating shaft mechanism according to claim 2, characterized in that: The projections of the boss and the groove in a plane parallel to the first surface are polygonal, and at least some of the corners of the polygon are rounded or chamfered.

5. The rotating shaft mechanism according to claim 1, characterized in that: The first forming portion has a first surface, the connecting hole includes a first hole segment and a second hole segment, the first hole segment is recessed from the first surface, the second hole segment is connected to an end of the first hole segment away from the first surface, and the cross-section of the second hole segment is larger than that of the first hole segment; The second molding portion has a second surface, the connecting portion includes a first connecting segment and a second connecting segment, the first connecting segment is convexly arranged on the second surface of the main body, and the second connecting segment is connected to an end of the first connecting segment away from the main body; The first connecting section matches with the first hole section, and the second connecting section matches with the second hole section.

6. The rotating shaft mechanism according to claim 5, characterized in that: The edge lines at both end surfaces of the first hole segment in the depth direction are provided with rounded corners or chamfered transitions; and / or, the edge line of the second hole segment close to one end of the first hole segment is provided with rounded corners or chamfered transitions.

7. The rotating shaft mechanism according to claim 1, characterized in that: The depth direction of the connection hole is along the first direction, and the plurality of connection holes are spaced apart and distributed along the second direction; A strip portion is connected between two side surfaces of the connection hole along the second direction, and the strip portion is located on a side of the connection hole close to the second forming portion along the first direction; The connecting portion is provided with a strip-shaped hole, and the strip-shaped portion matches the strip-shaped hole.

8. The rotating shaft mechanism according to claim 1, characterized in that: The length direction of the door panel is the second direction, and the connecting hole is in the shape of a long strip extending along the second direction.

9. The rotating shaft mechanism according to any one of claims 1 to 8, characterized in that: The first molded part includes a door panel, and the second molded part includes a swing arm.

10. The rotating shaft mechanism according to claim 9, characterized in that: The thickness direction of the door panel is the first direction, and the length direction of the door panel is the second direction; The door panel has a first surface, the first surface is perpendicular to the first direction, and a boss is convexly provided on the first surface; the door panel is provided with two connection holes spaced apart along the second direction, and the partition is provided between the two connection holes; the connection hole is located inside the outer contour of the boss and passes through the door panel along the thickness direction; a convex column is provided at a position of the boss corresponding to the partition; The swing arm comprises a main body and two connecting parts, the main body comprises a rotating arm, and the rotating arm is used to rotate and cooperate with the base; the main body has a second surface, and the main body has a groove concave from the second surface, the two connecting parts are respectively convexly arranged on the bottom surface of the groove, and the two connecting parts are spaced along the second direction, and a separation groove is provided between the two connecting parts; the bottom surface of the separation groove is provided with a concave hole; The swing arm is integrally formed on the door panel by secondary molding, and the second surface overlaps the first surface, the boss cooperates with the groove, the convex column cooperates with the concave hole, the two connecting parts cooperate with the two connecting holes respectively, and the two connecting parts are clamped on both sides of the partition and the convex column.

11. The rotating shaft mechanism according to any one of claims 1 to 8, characterized in that: The swing arm door panel member comprises a plurality of sub-structure segments, each of the sub-structure segments comprises a door panel segment and a swing arm, the door panel segment extends along a second direction, and the plurality of door panel segments are connected along the second direction; The first shaped portion includes a portion of the substructure segments among the plurality of substructure segments, and the second shaped portion includes another portion of the substructure segments among the plurality of substructure segments.

12. The rotating shaft mechanism according to claim 11, characterized in that: There are three substructure segments, the substructure segment in the middle is the first substructure segment, and the two substructure segments on both sides are the second substructure segments; the first molded portion includes the first substructure segment, and the second molded portion includes the second substructure segment; The door panel section of the first substructure section is provided with first overlapping sections at both ends along the second direction, and the thickness of the first overlapping section is less than the thickness of the door panel; the first overlapping section is provided with two connecting holes, the two connecting holes are spaced apart along the second direction, and a partition is provided between the two connecting holes; A second overlapping section is provided at one end of the door panel section of the second sub-structure section close to the first sub-structure section, and two connecting parts are protruding from a surface of the second overlapping section facing the first overlapping section, the two connecting parts are spaced apart along the second direction, and a separation groove is provided between the two connecting parts; The second overlapping section overlaps with the first overlapping section along the thickness direction, and the two connecting parts respectively match with the two connecting holes, the partition part matches with the partition groove, and the two connecting parts are respectively clamped on both sides of the partition part.

13. A foldable device, characterized in that: include: The rotating shaft mechanism according to any one of claims 1 to 12; A middle frame, rotatably connected to the swing arm door panel; The flexible screen covers the middle frame and the rotating shaft mechanism, and is supported by the swing arm door panel.

14. A method for preparing a rotating shaft mechanism, characterized in that: Used to prepare the rotating shaft mechanism according to any one of claims 1 to 12, wherein the method for preparing the rotating shaft mechanism comprises preparing the swing arm door panel, and the preparation of the swing arm door panel comprises: preparing the first molded part; The second molded portion is formed on the first molded portion through a secondary molding process, so that the second molded portion and the first molded portion are molded into an integrated swing arm door panel, and the adjacent connecting portions of the molded second molded portion are clamped on both sides of the partition portion.

15. The method for preparing the rotating shaft mechanism according to claim 14, characterized in that: The first molding part includes a door panel, and the second molding part includes a swing arm; the door panel is first molded, and then the swing arm is secondary molded on the door panel, or, The swing arm door panel component includes multiple sub-structural segments, each of which includes a door panel segment and a swing arm, the door panel segment extends along a second direction, and multiple door panel segments are connected along the second direction; the first molding part includes a part of the multiple sub-structural segments, and the second molding part includes another part of the multiple sub-structural segments; the sub-structural segments of the first molding part are molded first, and then the sub-structural segments of the second molding part are molded on the sub-structural segments of the first molding part.

16. The method for preparing the rotating shaft mechanism according to claim 14, characterized in that: The molding material used for the second molding part is MIM metal, amorphous metal, plastic or Peek material, and the second molding part is secondary molded on the first molding part through MIM process, amorphous molding process or injection molding process.

17. The method for preparing the rotating shaft mechanism according to claim 14, characterized in that: The molding material used for the first molding part is MIM metal, stamping metal, 3D printing metal or amorphous metal, and the first molding part is formed by MIM process, 3D printing molding process, punching and forging molding process, CNC machining process or amorphous molding process.

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