A rotating shaft device and a flat protective shell

Abstract

This utility model discloses a hinge device, including: a fixed bracket, a rotating bracket, and a hinge assembly. The fixed bracket has a mounting hole; the rotating bracket is used to connect to a tablet computer; one end of the hinge assembly is fixedly connected to the rotating bracket, and the other end of the hinge assembly extends into the mounting hole of the fixed bracket. The rotating bracket can rotate relative to the fixed bracket under the action of the hinge assembly. The rotating bracket has a retracted state parallel to the fixed bracket and a used state set at an angle to the fixed bracket. When an external force is applied to the rotating bracket in the retracted state, the rotating bracket can automatically pop open under the drive of the hinge assembly and rotate around the axis of the hinge assembly, so that the rotating bracket and the fixed bracket are set at an angle. The rotating bracket can automatically pop open under the drive of the hinge assembly and rotate around the axis of the hinge assembly, simplifying the flip-top operation. With this design, the user can open the tablet with one hand, which is convenient for daily use.

Description

Technical Field

[0001] This utility model relates to the field of rotating shaft technology, and in particular to a rotating shaft device and a flat plate protective shell. Background Technology

[0002] With the widespread use of tablet computers, their accompanying protective cases often adopt a flip-top design to achieve screen protection and stand functions. Traditional flip-top designs require the use of a hinge structure, which allows the tablet to rotate smoothly when opened and provides support after rotation.

[0003] However, the existing hinge structure has a poor opening and closing experience, generally requiring two hands to open, and lacks a self-locking function. Users need to manually open and close it throughout the process, and it cannot have the convenient function of automatically turning and opening with a light flip. Therefore, there is an urgent need for a hinge device that combines reliable self-locking, one-button automatic opening, and compact durability. Utility Model Content

[0004] The main purpose of this utility model is to propose a rotating shaft device to solve the problem that the rotating shaft device of the flat protective shell is not convenient to open and close manually in related technologies.

[0005] To achieve the above objectives, this utility model proposes a rotating shaft device, which includes: Fixed bracket with mounting holes; Rotating stand; for connecting to a tablet. A rotating shaft assembly, one end of which is fixedly connected to the rotating bracket, and the other end of which extends into the mounting hole of the fixed bracket. The rotating bracket can rotate relative to the fixed bracket under the action of the rotating shaft assembly. The rotating bracket has a storage state parallel to the fixed bracket and a use state set at an angle to the fixed bracket. When an external force is applied to the rotating bracket in the storage state, the rotating bracket can automatically spring open under the drive of the rotating shaft assembly and rotate around the axis of the rotating shaft assembly, so that the rotating bracket and the fixed bracket are set at an angle.

[0006] In some embodiments, the pivot assembly includes: A shaft, one end of which is fixedly connected to the rotating bracket, and the other end of which extends into the mounting hole. The cross-section of the shaft perpendicular to its extension direction is non-circular. A fixed cam is fixedly installed in the mounting hole. The fixed cam is provided with a through hole, through which the shaft passes. A rib is provided on the end face of the fixed cam facing away from the rotating bracket. A torsion spring is sleeved on the shaft and located between the fixed bracket and the rotating bracket. One end of the torsion spring is fixedly connected to the circumference of the shaft, and the other end of the torsion spring is fixedly connected to the fixed cam. A positioning cam is provided in the mounting hole and located at the end of the fixed cam facing away from the torsion spring. The positioning cam is provided with a mating hole, which is sleeved on the shaft. The positioning cam can rotate with the shaft. The side of the positioning cam facing the rib is provided with a recess that mates with the rib. An elastic element is disposed on the side of the positioning cam facing away from the fixed cam, and the elastic element elastically supports the positioning cam; The rotating bracket can rotate relative to the fixed bracket under the action of the shaft. When the rotating bracket is in the retracted state, the protruding rib is engaged with the recessed position, and the torsion spring stores energy. When an external force is applied to the rotating bracket in the retracted state, the torsion spring releases torque, causing the rotating bracket to rotate and be in use. At this time, the protruding rib and the recessed position are misaligned.

[0007] In some embodiments, the fixed bracket is provided with two mounting holes, which are located at both ends of the fixed bracket. The rotating bracket is located between the two mounting holes. There are two rotating shaft assemblies, one end of which is fixedly connected to both ends of the rotating bracket, and the other end of which extends into the two mounting holes.

[0008] In some embodiments, the fixed cam has a first insertion hole on one end face of the torsion spring, the shaft has an annular step extending circumferentially on one side of the torsion spring, the annular step has a second insertion hole, one end of the torsion spring is inserted into the first insertion hole, and the other end of the torsion spring is inserted into the second insertion hole.

[0009] In some embodiments, the positioning cam has a positioning boss on its end face facing the fixed cam, the fixed cam has an arc-shaped limiting groove, and the positioning boss is located in the arc-shaped limiting groove.

[0010] In some embodiments, the rotating shaft assembly further includes a limiting cam, the limiting cam being provided with an adapter hole that is sleeved on the shaft body, the positioning cam being rotatable with the shaft body, the limiting cam being located between the fixed cam and the torsion spring bracket, and the fixed cam having a limiting boss on the side facing the limiting cam.

[0011] In some embodiments, the shaft assembly further includes a fastening nut that is threaded to one end of the shaft that extends into the mounting hole, and the fastening nut is located on the side of the elastic element opposite to the positioning cam.

[0012] In some embodiments, the elastic element is a plurality of spring pieces, each of which is sleeved on the shaft body, and the tightening of the fastening nut can adjust the elastic support force of each spring piece on the positioning cam.

[0013] This utility model also provides a flat plate protective shell, which includes an upper shell, a lower shell, and a rotating shaft device as described above. The upper shell is detachably mounted on the rotating bracket, and the lower shell is fixedly connected to the fixed bracket.

[0014] In some embodiments, the upper housing includes a leather sleeve and a support plate, the support plate being detachably connected to the rotating bracket, and the leather sleeve being rotatably connected to the support plate.

[0015] The beneficial effects of this utility model's technical solution are as follows: The rotating shaft device of this utility model enables the rotating bracket to rotate relative to the fixed bracket and has both a storage state and a use state. At the same time, when an external force is applied to the rotating bracket in the storage state, the rotating bracket can automatically spring open under the drive of the rotating shaft assembly and rotate around the axis of the rotating shaft assembly, so that the rotating bracket and the fixed bracket are set at an angle. This simplifies the flip-cover operation, and the user can open the tablet with one hand, which is convenient for daily use. Attached Figure Description

[0016] Figure 1 This is an exploded view of the rotating shaft device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the rotating shaft device according to an embodiment of the present utility model; Figure 3 for Figure 1 Schematic diagram of the central axis assembly; Figure 4 for Figure 1 Exploded view of the central shaft assembly; Figure 5 for Figure 1 Exploded view of the central axis assembly from another perspective; Figure 6 for Figure 3 A schematic diagram of the structure of the fixed cam; Figure 7 for Figure 3 A structural schematic diagram of a fixed cam from another perspective; Figure 8 for Figure 3A schematic diagram of the center positioning cam; Figure 9 This is a schematic diagram of the structure of the flat panel protective shell according to an embodiment of the present utility model; Figure 10 for Figure 9 A schematic diagram of the upper and middle shell structure.

[0017] Explanation of icon numbers: 1000, Rotating shaft assembly; 100, Fixed bracket; 110, Mounting hole; 200, Rotating bracket; 300, Rotating shaft assembly; 310, Shaft body; 311, Annular step; 312, Second insertion hole; 320, Fixed cam; 321, Through hole; 322, Raised rib; 323, First insertion hole; 324, Arc-shaped limiting groove; 325, Limiting boss; 330, Torsion spring; 340, Positioning cam; 341, Mating hole; 342, Recess; 343, Positioning boss; 350, Elastic element; 360, Limiting cam; 361, Adaptor hole; 370, Fastening nut; 2000, Flat protective shell; 400, Upper shell; 410, Leather sleeve; 420, Support plate; 430, Hinge; 500, Lower shell; 3000, Flat plate. Detailed Implementation

[0018] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model. In addition, the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0019] To address the technical deficiencies in related technologies, this utility model provides a rotating shaft device 1000. Please refer to [link / reference needed]. Figures 1 to 8 The hinge device 1000 includes: a fixed bracket 100, a rotating bracket 200, and a hinge assembly 300, wherein the fixed bracket 100 has a mounting hole 110; the fixed bracket 100 is used to connect with the lower housing 500 of the tablet protective case 2000, the lower housing 500 can be a separate housing used to protect the screen of the tablet 3000 after the tablet 3000 is closed, or it can be a lower housing 500 with a keyboard that is wirelessly connected to the tablet 3000; the rotating bracket 200 is used to connect with the upper housing 400 of the tablet protective case 2000, the upper housing 400 being connected to the tablet 3000.

[0020] Additionally, one end of the pivot assembly 300 is fixedly connected to the rotating bracket 200, and the other end of the pivot assembly 300 extends into the mounting hole 110 of the fixed bracket 100. The rotating bracket 200 can rotate relative to the fixed bracket 100 under the action of the pivot assembly 300. The rotating bracket 200 has a retracted state parallel to the fixed bracket 100 and a used state at an angle to the fixed bracket 100. When an external force is applied to the rotating bracket 200 in the retracted state, the rotating bracket 200 can automatically spring open under the drive of the pivot assembly 300 and rotate around the axis of the pivot assembly 300, so that the rotating bracket 200 and the fixed bracket 100 are at an angle. This design simplifies the flip-top operation, allowing the user to open the tablet 3000 with one hand, making it convenient for daily use.

[0021] Furthermore, the rotating shaft assembly 300 includes: a shaft body 310, a fixed cam 320, a torsion spring 330, a positioning cam 340, and an elastic element 350. One end of the shaft body 310 is fixedly connected to the rotating bracket 200. The fixed connection between the shaft body 310 and the rotating bracket 200 can be by bonding, heat fusion, or other fixed connection methods, which are not specifically limited here. The other end of the shaft body 310 extends into the mounting hole 110. The cross-section of the shaft body 310 perpendicular to its extension direction is non-circular. The non-circular shape allows the shaft body 310 to rotate, causing other parts that are mounted on the shaft body 310 and fitted with it to rotate together. At this time, the non-circular cross-section of the shaft body 310 can be a "D" shape, a square shape, or other non-circular shapes, which are not limited here.

[0022] In addition, the fixed cam 320 is fixedly installed in the mounting hole 110. The fixed cam 320 is provided with a through hole 321. The shaft 310 is provided through the through hole 321 and can rotate relative to the fixed cam 320. The end face of the fixed cam 320 facing away from the rotating bracket 200 is provided with a rib 322. One rib 322 can be provided. In this embodiment, two ribs 322 are provided. The two ribs 322 are spaced apart along the circumference of the fixed cam 320.

[0023] A torsion spring 330 is sleeved on the shaft 310 and located between the fixed bracket 100 and the rotating bracket 200. One end of the torsion spring 330 is fixedly connected to the circumference of the shaft 310, and the other end of the torsion spring 330 is fixedly connected to the fixed cam 320. The torsion spring 330 is used to provide rotational force. When the user needs to open the flat plate 3000 and close the flat plate 3000, the rotating bracket 200 rotates from the use state to the storage state, and the torsion spring 330 stores energy. When the user needs to open the flat plate 3000 and the rotating bracket 200 rotates from the storage state to the use state, the torsion spring 330 stores and releases torque, causing the rotating bracket 200 to automatically rotate and open to a certain angle.

[0024] Furthermore, the positioning cam 340 is disposed within the mounting hole 110 and located at the end of the fixing cam 320 facing away from the torsion spring 330. The positioning cam 340 is provided with a mating hole 341, which is sleeved on the shaft 310. That is, the mating hole 341 is adapted to the outer contour shape of the shaft 310, so that the positioning cam 340 can rotate with the shaft 310. The side of the positioning cam 340 facing the rib 322 is provided with a recess 342 that mates with the rib 322. The elastic element 350 is disposed on the positioning cam. On the side facing away from the fixed cam 320, the elastic element 350 elastically supports the positioning cam 340; wherein, the rotating bracket 200 can rotate relative to the fixed bracket 100 under the action of the shaft 310, and has a storage state parallel to the fixed bracket 100 and a use state set at an angle to the fixed bracket 100. When the rotating bracket 200 is in the storage state, the protruding rib 322 is located in the recess 342 and fitted. When the rotating bracket 200 is in the use state, the protruding rib 322 and the recess 342 are misaligned.

[0025] With this configuration, when the user closes the tablet 3000, the rotating bracket 200 rotates, causing the shaft 310 to rotate. The shaft 310 rotates, causing the positioning cam 340 to rotate relative to the fixed cam 320, and also causing the torsion spring 330 to store energy. At this time, the rotating bracket 200 rotates to the retracted state, the tablet 3000 is closed, and the positioning cam 340, supported by the elastic element 350, has its protrusion rib 322 engaged with its recess 342, so that the rotating bracket 200 is in a relatively locked state. When the user needs to open the tablet 3000, the force applied to the tablet 3000 causes the tablet 3000 to rotate, causing the rotating bracket 200 to... When opened, the protruding rib 322 and the recess 342 are offset relative to each other, and the torsion spring 330 releases its stored energy, causing the rotating bracket 200 to automatically spring open and rotate at a certain angle. At this time, the plate 3000 automatically unfolds with the rotating bracket 200. Because the recess 342 of the positioning cam 340 is misaligned with the protruding rib 322 of the fixing cam 320, the amount of compression on the elastic element 350 is increased, which increases the support force of the elastic element 350 on the positioning cam 340. This makes the rotating shaft assembly 300 have a damping effect, and the plate 3000 can be adjusted in angle after automatic unfolding, making it convenient for users to adjust the suitable tilt angle of the plate 3000.

[0026] Through the above technical solution, the rotating shaft device 1000 of this utility model achieves precise engagement through the protrusion 322 on the fixed cam 320 and the recess 342 on the positioning cam 340. When the flat plate 3000 is closed (i.e., the rotating bracket 200 is in the storage state), it can achieve mechanical locking to prevent accidental opening. When the user applies the initial rotational force, the torsion spring 330 on the rotating shaft assembly 300 releases its stored energy, causing the shaft 310 to rotate, thereby causing the rotating bracket 200 to automatically spring open to the use angle (i.e., the rotating bracket 200 is in the use state), simplifying the flip-top operation. The user can open the flat plate 3000 with one hand, which is convenient for daily use. In the use state, the protrusion 322 and the recess 342 are misaligned, and the elastic element 350 presses the positioning cam 340, so that the rotating shaft device 1000 has a certain damping. The user can adjust the flat plate 3000 to any angle after it automatically springs open, making it convenient for the user to find a suitable use angle.

[0027] In this embodiment, the fixed bracket 100 has two mounting holes 110 located at both ends of the fixed bracket 100. The rotating bracket 200 is located between the two mounting holes 110. Two rotating shaft assemblies 300 are provided, with one end of each assembly fixedly connected to both ends of the rotating bracket 200, and the other end extending into the two mounting holes 110. Thus, the symmetrical distribution of the dual rotating shaft assemblies 300 allows both sides of the rotating bracket 200 to rotate synchronously, improving the balance and load-bearing capacity of the rotating bracket 200 and preventing the plate 3000 from tilting. Furthermore, both ends of the rotating bracket 200 are supported by the rotating shafts, reducing stress concentration on one side, optimizing structural strength, and extending service life.

[0028] To facilitate the installation of the torsion spring 330, in this embodiment, the fixed cam 320 has a first insertion hole 323 on one end face facing the torsion spring 330, and the shaft 310 has an annular step 311 extending circumferentially on one side facing the torsion spring 330. The annular step 311 has a second insertion hole 312. One end of the torsion spring 330 is inserted into the first insertion hole 323, and the other end of the torsion spring 330 is inserted into the second insertion hole 312. This design ensures reliable installation of the torsion spring 330, and the insertion fit design of the first insertion hole 323 and the second insertion hole 312 ensures that both ends of the torsion spring 330 are firmly fixed, preventing it from falling off or shifting.

[0029] In this embodiment, the positioning cam 340 has a positioning boss 343 on its end face facing the fixed cam 320, and the fixed cam 320 has an arc-shaped limiting groove 324, with the positioning boss 343 located within the arc-shaped limiting groove 324. Furthermore, in this embodiment, the rotatable angle of the positioning boss 343 within the arc-shaped limiting groove 324 is 0° to 80°. This allows the positioning boss 343 to slide within the arc-shaped limiting groove 324, limiting the rotation range of the shaft 310 and preventing excessive rotation from damaging internal components. In this embodiment, the rotating shaft assembly 300 further includes a limiting cam 360, which has an adapter hole 361 that fits onto the shaft body 310. A positioning cam 340 can rotate with the shaft body 310. The limiting cam 360 is located on the support between the fixed cam 320 and the torsion spring 330. A limiting boss 325 is provided on the side of the fixed cam 320 facing the limiting cam 360. The limiting boss 325 cooperates with the limiting cam 360 to form a mechanical block during excessive rotation, protecting the torsion spring 330 from overstretching. Furthermore, a secondary limiting mechanism is added in addition to the main limiting mechanism of the positioning boss 343 and the arc-shaped limiting groove 324, providing redundant safety design and improving reliability.

[0030] It is worth noting that in this embodiment, the shaft assembly 300 also includes a fastening nut 370, which is threadedly connected to one end of the shaft 310 that extends into the mounting hole 110. The fastening nut 370 is located on the side of the elastic member 350 facing away from the positioning cam 340. Thus, by tightening the fastening nut 370 to compress the elastic member 350, the clamping force between the positioning cam 340 and the fixed cam 320 can be dynamically adjusted, optimizing self-locking stability and rotational damping. In addition, the internal components can be quickly replaced after the fastening nut 370 is disassembled, reducing maintenance costs.

[0031] In addition, the elastic element 350 consists of multiple spring pieces, each sleeved on the shaft 310. Tightening the fastening nut 370 adjusts the elastic support force of each spring piece on the positioning cam 340. The use of multiple layers of spring pieces provides progressive elastic force, avoiding single-point stress fatigue.

[0032] Please see Figures 9 to 10This utility model also provides a tablet protective shell 2000, which includes an upper shell 400, a lower shell 500, and a rotating shaft device 1000 as described above. The upper shell 400 is detachably mounted on the rotating bracket 200, and the lower shell 500 is fixedly connected to the fixed bracket 100. The tablet protective shell 2000 offers a seamless user experience: the rotating shaft device 1000 is integrated into the shell, enabling a seamless "self-locking when closed, and pop-open with a gentle push" operation. The upper shell 400 and the rotating bracket 200 are separable, allowing users to easily remove the tablet 3000 mounted on the upper shell 400 for individual use. It should be noted that there are many ways to detachably connect the upper shell 400 and the rotating bracket 200. For example, the upper shell 400 can be connected to the rotating bracket 200 by a snap-fit ​​method, by a plug-in method, or by other detachable connection methods. No specific limitations are made here.

[0033] Furthermore, in this embodiment, the upper housing 400 includes a leather sleeve 410 and a support plate 420. The support plate 420 is detachably connected to the rotating bracket 200, and the leather sleeve 410 is rotatably connected to the support plate 420. For example, in this embodiment, the leather sleeve 410 and the support plate 420 are rotatably connected by a hinge 430. With this configuration, after the upper housing 400 is removed separately, the tablet 3000 can be supported by the leather sleeve 410 or the support plate 420, making it convenient for the user to use the tablet 3000 independently.

[0034] It should be noted that the specific structure of the rotating shaft device 1000 refers to the above embodiments. Since the flat protective shell 2000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0035] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A rotating shaft device, characterized in that, The rotating shaft device includes: A fixed bracket (100) has mounting holes (110); Rotating stand (200); for connecting to a tablet computer; A rotating shaft assembly (300) is provided, one end of which is fixedly connected to the rotating bracket (200), and the other end of which extends into the mounting hole (110) of the fixed bracket (100). The rotating bracket (200) can rotate relative to the fixed bracket (100) under the action of the rotating shaft assembly (300). The rotating bracket (200) has a storage state parallel to the fixed bracket (100) and a use state set at an angle to the fixed bracket (100). When an external force is applied to the rotating bracket (200) in the storage state, the rotating bracket (200) can automatically spring open under the drive of the rotating shaft assembly (300) and rotate around the axis of the rotating shaft assembly (300) so that the rotating bracket (200) and the fixed bracket (100) are set at an angle.

2. The rotating shaft device according to claim 1, characterized in that, The rotating shaft assembly (300) includes: A shaft (310) is fixedly connected at one end to the rotating bracket (200), and the other end of the shaft (310) extends into the mounting hole (110). The cross section of the shaft (310) perpendicular to its extension direction is non-circular. A fixed cam (320) is fixedly installed in the mounting hole (110). The fixed cam (320) is provided with a through hole (321). The shaft (310) is provided through the through hole (321). A rib (322) is provided on the end face of the fixed cam (320) facing away from the rotating bracket (200). A torsion spring (330) is sleeved on the shaft (310) and located between the fixed bracket (100) and the rotating bracket (200). One end of the torsion spring (330) is fixedly connected to the circumference of the shaft (310), and the other end of the torsion spring (330) is fixedly connected to the fixed cam (320). A positioning cam (340) is provided in the mounting hole (110) and located at the end of the fixing cam (320) facing away from the torsion spring (330). The positioning cam (340) is provided with a mating hole (341), which is sleeved on the shaft (310). The positioning cam (340) can rotate with the shaft (310). The side of the positioning cam (340) facing the rib (322) is provided with a recess (342) that mates with the rib (322). An elastic element (350) is disposed on the side of the positioning cam (340) facing away from the fixed cam (320), and the elastic element (350) elastically supports the positioning cam (340); The rotating bracket (200) can rotate relative to the fixed bracket (100) under the action of the shaft (310). When the rotating bracket (200) is in the retracted state, the protruding rib (322) is engaged with the recess (342), and the torsion spring (330) stores energy. When an external force is applied to the rotating bracket (200) in the retracted state, the torsion spring (330) releases torque, causing the rotating bracket (200) to rotate and be in use. At this time, the protruding rib (322) and the recess (342) are misaligned.

3. The rotating shaft device according to claim 2, characterized in that, The fixed bracket (100) is provided with two mounting holes (110), which are located at both ends of the fixed bracket (100). The rotating bracket (200) is located between the two mounting holes (110). There are two rotating shaft assemblies (300). One end of each rotating shaft assembly (300) is fixedly connected to both ends of the rotating bracket (200), and the other end of each rotating shaft assembly (300) extends into the two mounting holes (110).

4. The rotating shaft device according to claim 2, characterized in that, The fixed cam (320) has a first insertion hole (323) on one end face facing the torsion spring (330), and the shaft (310) has an annular step (311) extending circumferentially on one side facing the torsion spring (330). The annular step (311) has a second insertion hole (312). One end of the torsion spring (330) is inserted into the first insertion hole (323), and the other end of the torsion spring (330) is inserted into the second insertion hole (312).

5. The rotating shaft device according to claim 2, characterized in that, The positioning cam (340) has a positioning boss (343) on its end face facing the fixed cam (320), and the fixed cam (320) has an arc-shaped limiting groove (324), with the positioning boss (343) located in the arc-shaped limiting groove (324).

6. The rotating shaft device according to claim 2, characterized in that, The rotating shaft assembly (300) also includes a limiting cam (360), which is provided with an adapter hole (361). The adapter hole (361) is sleeved on the shaft body (310). The positioning cam (340) can rotate with the shaft body (310). The limiting cam (360) is located between the fixed cam (320) and the torsion spring (330) support. The fixed cam (320) is provided with a limiting boss (325) on the side facing the limiting cam (360).

7. The rotating shaft device according to claim 2, characterized in that, The pivot assembly (300) also includes a fastening nut (370) which is threaded to one end of the shaft (310) that extends into the mounting hole (110) and is located on the side of the elastic element (350) facing away from the positioning cam (340).

8. The rotating shaft device according to claim 7, characterized in that, The elastic element (350) consists of multiple spring pieces, each of which is sleeved on the shaft (310). Tightening the fastening nut (370) can adjust the elastic support force of each spring piece on the positioning cam (340).

9. A protective case for a flat panel, characterized in that, The flat protective shell includes an upper shell (400), a lower shell (500), and a rotating shaft device as described in any one of claims 1 to 8. The upper shell (400) is detachably mounted on the rotating bracket (200), and the lower shell (500) is fixedly connected to the fixed bracket (100).

10. The flat panel protective shell according to claim 9, characterized in that, The upper housing (400) includes a leather sleeve (410) and a support plate (420). The support plate (420) is detachably connected to the rotating bracket (200), and the leather sleeve (410) is rotatably connected to the support plate (420).

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