Self-locking rotating shaft structure

Abstract

The utility model relates to a self-locking rotating shaft structure between turning pages, in particular to a self-locking rotating shaft structure. The torsion assembly comprises a rotating shaft, a torsion assembly and a damping assembly, and the rotating shaft is fixedly connected with the first turnover hinge and is provided with a stopping convex edge and an elastic piece; the torsion assembly comprises a first wheel sleeve and a second wheel sleeve, and the self-locking function is achieved through cooperation of first buckling teeth and second buckling teeth. The damping assembly comprises a damping sleeve and a damping rotating piece, and the damping effect is generated through friction between the first damping face and the second damping face. When the first turnover page and the second turnover page are closed, the elastic piece is in a compressed state, and the top surfaces of the first buckling teeth and the second buckling teeth are attached; and when the first overturning hinge and the second overturning hinge are overturned to the optimal working angle, the elastic piece pushes the first wheel sleeve, so that the first buckling tooth is matched with the second concave surface, and the second buckling tooth is matched with the first concave surface. Automatic locking at the optimal working position is achieved, the stable damping effect is provided, and the use stability of the overturning hinge is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotating shaft mechanisms, in particular to a self-locking rotating shaft structure. BACKGROUND

[0002] In today's rapidly changing technology, mobile phones, computers, tablets, three-fold, multi-fold electronic devices have become an integral part of people's daily lives. These devices not only greatly enrich people's entertainment life, but also significantly improve work efficiency. In recent years, with the continuous growth of users' demand for portability and multi-functionality, foldable electronic devices have quickly become the focus of the market.

[0003] At present, the rotating shafts of existing foldable electronic devices are provided with damping structures. In the case of folding the device at a large angle, the metal parts inside the rotating shaft will continuously maintain a large friction and pressure between them, causing the rotating shaft parts to wear out and the rotating shaft to become more loose. When the folding device is at a normal working angle, the unfolding angle of the device will be unstable due to the loosening of the rotating shaft, and the user needs to adjust it repeatedly with both hands to adjust the folding device to the best working angle. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to overcome the above technical problems, and provide a self-locking rotating shaft structure.

[0005] A self-locking rotating shaft structure comprises:

[0006] A rotating shaft is fixedly connected to the first flip page, and the rotating shaft comprises a stop protrusion. An elastic member is sleeved on the outer circumferential surface of the rotating shaft.

[0007] A torsion assembly is sleeved on the rotating shaft. The torsion assembly comprises a first wheel sleeve and a second wheel sleeve. The first wheel sleeve abuts against the elastic member, and the first wheel sleeve can only slide along the rotating shaft. The second wheel sleeve can slide along the rotating shaft and rotate around the rotating shaft. The first wheel sleeve is provided with two first clamping teeth that are centrally symmetric with the rotating shaft as the center. A first concave surface is formed between the two first clamping teeth. The second wheel sleeve is provided with a second clamping tooth that cooperates with the first concave surface. A second concave surface that cooperates with the first clamping tooth is formed between the two second clamping teeth.

[0008] A damping assembly is sleeved on the rotating shaft, and comprises a damping sleeve and a damping rotating member. The damping sleeve is in abutment with the second wheel sleeve and is only slidable along the rotating shaft. A first damping surface is arranged on a side of the damping sleeve away from the second wheel sleeve. The damping rotating member is capable of cooperating with the second flipping page and driving the second flipping member to rotate synchronously around the rotating shaft. A second damping surface is arranged on an end of the damping rotating member away from the stopper protruding edge and capable of cooperating with the first damping surface. Friction between the first damping surface and the second damping surface can generate damping. When the first flipping page and the second flipping page are closed, the elastic member is in a compressed state, and the top surface of the first clamping tooth is in abutement with the top surface of the second clamping tooth. When the first flipping page and the second flipping page are flipped to an optimal working angle, the elastic member pushes the first wheel sleeve, the first clamping tooth cooperates with the second concave surface, and the second clamping tooth cooperates with the first concave surface.

[0009] By adopting the above scheme, when the first flipping page and the second flipping page are unfolded from the closed state, the top surface of the first clamping tooth is in friction with the top surface of the second clamping tooth. At this time, the first flipping page and the second flipping page only bear the resistance between the first damping surface and the second damping surface and the friction between the first clamping tooth and the second clamping tooth in the flipping process. When the first flipping page and the second flipping page are flipped to the optimal working angle, the elastic member pushes the first clamping tooth to cooperate with the second concave surface, and the second clamping tooth cooperates with the first concave surface. The first clamping tooth and the second clamping tooth play a self-locking role, so that the first flipping page and the second flipping page cannot be easily flipped continuously. At this time, the angle of the first flipping page and the second flipping page is limited.

[0010] In one of the embodiments, a first mounting block is arranged on the outer circumferential surface of the second wheel sleeve, and a second mounting block is arranged on the outer circumferential surface of the damping rotating member. The first mounting block and the second mounting block are capable of cooperating with the second flipping page.

[0011] By adopting the above scheme, the first mounting block and the second mounting block simultaneously play a limiting role, so that the second flipping page can stably drive the damping rotating member and the second wheel sleeve to rotate synchronously.

[0012] In one of the embodiments, a sliding block is arranged on one end of the first mounting block close to the second wheel sleeve, and the second mounting block is provided with a sliding groove capable of cooperating with the sliding block.

[0013] By adopting the above scheme, the cooperation between the sliding groove and the sliding block further limits the positions of the second wheel sleeve and the damping rotating member, so as to ensure that the damping rotating member and the second wheel sleeve can rotate synchronously.

[0014] In one of the embodiments, the stopper protruding edge is provided with a stopper gap, and the second mounting block is slidable along the stopper gap.

[0015] By adopting the above scheme, the stop gap and the second mounting block further limit the turning angles of the first and second turning pages, preventing the turning angles between the turning pages from being too large, which causes the device to bend and damage.

[0016] In one of the embodiments, the first catch tooth comprises a first steep slope and a first gentle slope, and the second catch tooth comprises a second steep slope and a second gentle slope, when the first and second turning pages are turned to the optimal working angle, the first steep slope cooperates with the second steep slope, and the first gentle slope cooperates with the second gentle slope, the first gentle slope faces the opening direction of the first and second turning pages, and the first steep slope faces the closing direction of the first and second turning pages.

[0017] By adopting the above scheme, during the turning of the first and second turning pages, the first and second gentle slopes slide relative to each other, the elastic member applies an elastic pushing force to the first slope, the first slope presses the second slope, thereby generating a torsional force in the same direction as the opening direction of the turning pages, and the user can open the first and second turning pages with smaller force, when the opening angle of the first and second turning pages is greater than the optimal working angle, the first and second steep slopes abut, and the first and second steep slopes generate a torsional force in the opposite direction of the opening direction of the turning pages, thereby causing the first and second turning pages to automatically return to the optimal working angle after being turned to a larger angle.

[0018] In one of the embodiments, the damping sleeve comprises two first protrusions that are centrally symmetric with the rotation shaft axis as the center, the damping rotating member comprises a second protrusion that is centrally symmetric with the rotation shaft axis as the center, the top of the first protrusion is a first damping surface, the top of the second protrusion is a second damping surface, and the first and second damping surfaces can generate damping through friction, the first and second damping surfaces abut before the first and second steep slopes abut when the first and second turning pages are opened from the closed state.

[0019] By adopting the above scheme, the first and second damping surfaces generate damping through friction before the first and second turning pages are turned to the optimal working angle, so that the first and second turning pages can hover at any angle.

[0020] In one of the embodiments, the first protrusion comprises a third steep slope surface, the second protrusion comprises a fourth steep slope surface, the third steep slope surface faces the unfolding direction of the first and second flip pages, when the first and second flip pages are about to unfold to the optimal working angle, the third steep slope surface slides against the fourth steep slope surface, when the third steep slope surface completely abuts against the fourth steep slope surface, the first and second flip pages reach the optimal working angle.

[0021] By using the above scheme, when the third steep slope surface cooperates with the fourth steep slope surface, a torsional force in the same direction as the unfolding direction of the flip pages is generated under the pushing force of the elastic member, under the action of the torsional force, the first and second flip pages are automatically moved to the optimal working position, and the self-locking effect of the first and second flip pages is enhanced.

[0022] In one of the embodiments, the first protrusion further comprises a third gentle slope surface, the second protrusion further comprises a fourth gentle slope surface, the third gentle slope surface faces the closing direction of the first and second flip pages, when the first and second flip pages are closed, the top edge of the third gentle slope surface abuts against the top edge of the fourth gentle slope surface.

[0023] By using the above scheme, when the first and second flip pages are closed, the third gentle slope surface and the fourth gentle slope surface provide a torsional force in the closing direction of the flip pages, so that the first and second flip pages can be stably closed, and at the same time, since the inclination angles of the third gentle slope surface and the fourth gentle slope surface are small, the unfolding of the flip pages is not affected.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. When the first and second flip pages are unfolded from the closed state, the top surface of the first catch tooth rubs against the top surface of the second catch tooth, at this time, the first and second flip pages only bear the resistance between the first and second damping surfaces and the friction between the first and second catch teeth in the process of flipping, when the first and second flip pages are flipped to the optimal working angle, the elastic member pushes the first catch tooth to cooperate with the second concave surface, and the second catch tooth cooperates with the first concave surface, the first and second catch teeth play a self-locking role, so that the first and second flip pages cannot easily continue to flip, at this time, the angle of the first and second flip pages is limited.

[0026] 2. In the process of the first flip page and the second flip page turning, the first ramp surface and the second ramp surface slide relative to each other, the elastic member applies an elastic pushing force to the first ramp surface, the first ramp surface presses the second ramp surface, thereby generating a torsional force in the same direction as the turning direction of the flip page, the user can open the first flip page and the second flip page with a smaller force, when the opening angle of the first flip page and the second flip page is greater than the optimal working angle, the first steep surface and the second steep surface abut, the first steep surface and the second steep surface generate a torsional force in the opposite direction of the turning direction of the flip page, thereby making the first flip page and the second flip page turn to a larger angle and then automatically return to the optimal working angle.

[0027] 3. When the third steep surface and the fourth steep surface cooperate, a torsional force in the same direction as the turning direction of the flip page will be generated under the pushing force of the elastic member, under the action of the torsional force, the first flip page and the second flip page will automatically move to the optimal working position, enhancing the self-locking effect of the first flip page and the second flip page, when the first flip page and the second flip page are closed, the third ramp surface and the fourth ramp surface will provide a torsional force in the closing direction of the flip page, so that the first flip page and the second flip page can be stably closed, at the same time, since the inclination angle of the third ramp surface and the fourth ramp surface is small, it does not affect the opening of the flip page. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic view of the combination of the first flip page and the second flip page.

[0029] Figure 2 is a schematic view of the combination of the first flip page and the second flip page.

[0030] Figure 3 is a structural schematic view of a self-locking rotating shaft structure provided by the present application.

[0031] Figure 4 is an exploded view of a self-locking rotating shaft structure provided by the present application.

[0032] Figure 5 is a structural schematic view of the first wheel sleeve.

[0033] Figure 6 is a structural schematic view of the second wheel sleeve.

[0034] Figure 7 is a structural schematic view of the damping sleeve.

[0035] Figure 8 is a structural schematic view of the damping rotating member.

[0036] Explanation of reference signs: 1, rotating shaft; 11, stop protrusion; 111, stop notch; 12, elastic member; 2, torsion assembly; 21, first wheel sleeve; 211, first buckle tooth; 2111, first steep slope surface; 2112, first gentle slope surface; 212, first concave surface; 22, second wheel sleeve; 221, second buckle tooth; 2211, second steep slope surface; 2212, second gentle slope surface; 222, second concave surface; 223, first mounting block; 2231, sliding groove; 3, damping assembly; 31, damping sleeve; 311, first protrusion; 3111, first damping surface; 3112, third steep slope surface; 3113, third gentle slope surface; 32, damping rotating member; 321, second protrusion; 3211, second damping surface; 3212, fourth steep slope surface; 3213, fourth gentle slope surface; 322, second mounting block; 3221, sliding block; 4, first flip page; 5, second flip page. DETAILED DESCRIPTION

[0037] Therefore, it is necessary to provide a self-locking rotating shaft structure which is automatically stabilized at an optimal working angle.

[0038] The damping rotating shaft structure provided by the present application is used for the flipping of the first flip page 4 and the second flip page 5. Please refer to Figures 1-3 , Figure 3 The self-locking rotating shaft structure provided by the present application is shown in a structural schematic diagram, which comprises a rotating shaft 1, a torsion assembly 2 and a damping assembly 3.

[0039] Please refer to Figure 4 , Figure 4 The self-locking rotating shaft structure provided by the present application is shown in an exploded view. The rotating shaft 1 is fixedly connected with the first flip page 4, and the first flip page 4 can drive the rotating shaft 1 to rotate synchronously. The rotating shaft 1 is provided with a stop protrusion 11. The outer circumferential surface of the rotating shaft 1 is sleeved with an elastic member 12, which can be a spring. The rotating shaft 1 can be made of stainless steel or aluminum alloy, which has high strength and corrosion resistance.

[0040] Please refer to Figures 5-6 , Figure 5As a structural schematic diagram of the first wheel sleeve, the torsion assembly 2 comprises a first wheel sleeve 21 and a second wheel sleeve 22, which can be made of plastic or light alloy material to reduce the overall weight while maintaining good mechanical strength. The first wheel sleeve 21 and the second wheel sleeve 22 are both sleeved on the rotating shaft 1, wherein the first wheel sleeve 21 can only slide along the rotating shaft 1, and the second wheel sleeve 22 can both slide along the rotating shaft 1 and rotate around the rotating shaft 1. The first wheel sleeve 21 is provided with two first clamping teeth 211 that are centrally symmetric with the rotating shaft 1 as the center, and a first concave surface 212 is formed between the two first clamping teeth 211. The second wheel sleeve 22 is provided with second clamping teeth 221 that cooperate with the first concave surface 212, and a second concave surface 222 that can cooperate with the first clamping teeth 211 is formed between the two second clamping teeth 221.

[0041] The shapes of the first clamping teeth 211 and the second clamping teeth 221 can be designed as trapezoidal or other geometric shapes according to actual needs to better achieve the self-locking function. The first clamping teeth 211 include a first steep slope surface 2111 and a first gentle slope surface 2112, and the second clamping teeth 221 include a second steep slope surface 2211 and a second gentle slope surface 2212. When the first flip page 4 and the second flip page 5 are flipped to the optimal working angle, the first steep slope surface 2111 cooperates with the second steep slope surface 2211, and the first gentle slope surface 2112 cooperates with the second gentle slope surface 2212. The first gentle slope surface 2112 faces the unfolding direction of the first flip page 4 and the second flip page 5, and the first steep slope surface 2111 faces the closing direction of the first flip page 4 and the second flip page 5.

[0042] During the flipping of the first flip page 4 and the second flip page 5, the first gentle slope surface 2112 and the second gentle slope surface 2212 abut against each other, and the elastic member 12 transmits the elastic force to the first wheel sleeve 21, so that a torsional force in the same direction as the flipping direction of the first flip page 4 and the second flip page 5 is generated between the first gentle slope surface 2112 and the second gentle slope surface 2212. When the first flip page 4 and the second flip page 5 are unfolded, the first wheel sleeve 21 and the second wheel sleeve 22 rotate relative to the first flip page 4 and the second flip page 5, thereby transmitting the torsional force to the first flip page 4 and the second flip page 5, so that the user can more easily unfold the first flip page 4 and the second flip page 5. When the flipping angle of the first flip page 4 and the second flip page 5 exceeds the optimal working angle, the first steep slope surface 2111 cooperates with the second steep slope surface 2211, thereby generating a torsional force in the same direction as the closing direction of the first flip page 4 and the second flip page 5, so that the first flip page 4 and the second flip page 5 are automatically restored to the optimal working angle after being flipped to a larger angle.

[0043] Please refer to Figures 7-8 , Figure 7The damping sleeve structure diagram, the damping assembly 3 includes damping sleeve 31 and damping rotating piece 32, damping sleeve 31 and damping rotating piece 32 are all set in the rotating shaft 1, damping sleeve 31 can adopt high polymer material, has good wear resistance and low friction coefficient.Damping rotating piece 32 can adopt metal or composite material, ensure its stability and reliability in long-term use.Damping sleeve 31 side away from the second wheel sleeve 22 is equipped with the first damping surface 3111, the outer circumferential surface of damping rotating piece 32 is equipped with the second installation block 322, the outer circumferential surface of second wheel sleeve 22 is equipped with the first installation block 223, the cross-sectional shape of first installation block 223 and second installation block 322 is same, and both can be matched with second flip page 5, first installation block 223 and second installation block 322 play the role of limiting simultaneously, make second flip page 5 can drive damping rotating piece 32 and second wheel sleeve 22 synchronous rotation stably, the one end of second installation block 322 near second wheel sleeve 22 is equipped with sliding block 3221, first installation block 223 is equipped with the sliding groove 2231 matched with sliding block 3221, sliding block 3221 can slide along sliding groove 2231, the cooperation of sliding groove 2231 and sliding block 3221 further limits the position of second wheel sleeve 22 and damping rotating piece 32, ensure that damping rotating piece 32 and second wheel sleeve can synchronous rotation.The one end of damping rotating piece 32 away from stopper convex edge 11 is equipped with the second damping surface 3211 matched with second damping surface 3211.

[0044] In the application, the stopper edge is equipped with stopper gap 111, second installation block 322 extends to the direction where stopper edge is, thereby cooperating with stopper gap 111, stopper block can slide along stopper gap 111, the maximum angle that stopper block can draw is the maximum angle that first flip page 4 and second flip page 5 can unfold, when the turning angle of first flip page 4 and second flip page 5 is too large, stopper gap 111 blocks stopper block, prevent the unfolding angle of first flip page 4 and second flip page 5 from being too large, cause the damage of equipment.

[0045] Damping sleeve 31 includes two first convex 311 that are central symmetry with rotating shaft 1 axis as center, damping rotating piece 32 includes second convex 321 that are central symmetry with rotating shaft 1 axis as center.The top of first convex 311 is first damping surface 3111, the top of second convex 321 is second damping surface 3211, the friction between first damping surface 3111 and second damping surface 3211 can produce damping.When first flip page 4 and second flip page 5 unfold from closed state, before first steep slope surface 2111 and second steep slope surface 2211 are pasted, first damping surface 3111 and second damping surface 3211 slide relative, produce damping, make first flip surface and second flip surface can realize arbitrary angle's hover.

[0046] In addition, the first protrusion 311 further comprises a third steep slope surface 3112 and a third gentle slope surface 3113, and the second protrusion 321 comprises a fourth steep slope surface 3212 and a fourth gentle slope surface 3213, the third steep slope surface 3112 faces the unfolding direction of the first flip page 4 and the second flip page 5. When the first flip page 4 and the second flip page 5 are about to unfold to the optimal working angle, the third steep slope surface 3112 and the fourth steep slope surface 3212 slide relative to each other, and when the third steep slope surface 3112 and the fourth steep slope surface 3212 are completely attached to each other, the first flip page 4 and the second flip page 5 reach the optimal working angle. The third gentle slope surface 3113 faces the closing direction of the first flip page 4 and the second flip page 5, and when the first flip page 4 and the second flip page 5 are closed, the top edge of the third gentle slope surface 3113 and the top edge of the fourth gentle slope surface 3213 abut each other.

[0047] The working principle of the present application is that when the first flip page 4 and the second flip page 5 are in the closed state, the top surface of the first catch tooth 211 and the second catch tooth 221 are attached, the edges of the third gentle slope surface 3113 and the fourth gentle slope surface 3213 abut each other, and since the third gentle slope surface 3113 faces the closing direction of the first flip page 4 and the second flip page 5, the elastic member 12 transmits the elastic force to the damping sleeve 31, and a torsional force is generated between the third gentle slope surface 3113 and the fourth gentle slope surface 3213, so that the first flip page 4 and the second flip page 5 can be stably closed.

[0048] When the first flip page 4 and the second flip page 5 are unfolded from the closed state, since the inclination angle of the third gentle slope surface and the fourth gentle slope surface 3213 is small, it does not affect the unfolding of the flip page, and under the action of the inertia of the device itself, the first flip page 4 and the second flip page 5 are unfolded by a distance, the top surface of the first catch tooth 211 passes the top surface of the second catch tooth 221, and then the first gentle slope surface 2112 and the second gentle slope surface 2212 rub against each other, the elastic member 12 transmits the elastic force to the first gentle slope surface 2112, and a torsional force in the same direction as the unfolding direction between the first flip page 4 and the second flip page 5 is generated between the first gentle slope surface 2112 and the second gentle slope surface 2212, so that the external force required for the first flip page 4 and the second flip page 5 to continue to unfold is smaller, and at this time, the first damping surface 3111 and the second damping surface 3211 rub against each other to generate damping, and in this process, the first flip page 4 and the second flip page 5 can realize free hovering.

[0049] When the opening angle of the first flip page 4 and the second flip page 5 is about to reach the optimal working angle, the third steep slope surface 3112 and the fourth steep slope surface 3212 are attached, and since the inclination angle of the steep slope surface is larger, the first flip page 4 and the second flip page 5 will be subjected to a larger torsional force in the unfolding direction, the third steep slope surface 3112 and the fourth steep slope surface 3212 slide relative to each other, so that the first flip page 4 and the second flip page 5 are automatically flipped to the optimal working angle, and the self-locking effect when the first flip page 4 and the second flip page 5 are in the optimal working angle is enhanced.

[0050] When the first flip page 4 and the second flip page 5 are at the optimal working angle, the first steep slope surface 2111 and the second steep slope surface 2211 abut, so that the first flip page 4 and the second flip page 5 cannot easily continue to flip, at this time, the first buckle tooth 211 cooperates with the second concave surface 222, and the second buckle tooth 221 cooperates with the first concave surface 212, to realize self-locking of the first flip page 4 and the second flip page 5, when the flip angle of the first flip page 4 and the second flip page 5 is greater than the optimal working angle, a relatively large torsional force opposite to the unfolding direction between the flip pages is generated between the first steep slope surface 2111 and the second steep slope surface 2211, so that the first flip page 4 and the second flip page 5 automatically return to the optimal working angle, to realize the self-locking effect of the first flip page 4 and the second flip page 5.

[0051] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: equivalent changes made on the basis of the structure, shape, principle of the present application should be encompassed within the protection scope of the present application.

Claims

1. A self-locking hinge structure for flipping a first flip page (4) and a second flip page (5), characterized in that, include: A rotating shaft (1) is fixedly connected to the first flip page (4). The rotating shaft (1) includes a stop flange (11), and an elastic element (12) is sleeved on the outer peripheral surface of the rotating shaft (1). A torsion assembly (2) is sleeved on the rotating shaft (1). The torsion assembly (2) includes a first wheel sleeve (21) and a second wheel sleeve (22). The first wheel sleeve (21) abuts against the elastic element (12). The first wheel sleeve (21) can only slide along the rotating shaft (1). The second wheel sleeve (22) can slide along the rotating shaft (1) and rotate around the rotating shaft (1). The end of the first wheel sleeve (21) away from the elastic element (12) is provided with two first buckles (211) that are centrally symmetrical about the axis of the rotating shaft (1). A first concave surface (212) is formed between the two first buckles (211). The second wheel sleeve (22) is provided with second buckles (221) that cooperate with the first concave surface (212). A second concave surface (222) that can cooperate with the first buckles (211) is formed between the two second buckles (221). A damping assembly (3) is sleeved on the rotating shaft (1). The damping assembly (3) includes a damping sleeve (31) and a damping rotating member (32). The damping sleeve (31) abuts against the second wheel sleeve (22) and can only slide along the rotating shaft (1). The damping sleeve (31) has a first damping surface (3111) on the side away from the second wheel sleeve (22). The damping rotating member (32) can cooperate with the second flipping page (5) and can drive the second flipping member to rotate synchronously around the rotating shaft (1). The damping rotating member (32) has a second damping surface (3111) at the end away from the stop protrusion (11). The friction between the first damping surface (3111) and the second damping surface (3211) can generate damping. When the first flipping page (4) and the second flipping page (5) are closed, the elastic element (12) is in a compressed state. The top surfaces of the first snap tooth (211) and the second snap tooth (221) are in contact. When the first flipping page (4) and the second flipping page (5) are flipped to the optimal working angle, the elastic element (12) pushes the first wheel sleeve (21). The first snap tooth (211) cooperates with the second concave surface (222), and the second snap tooth (221) cooperates with the first concave surface (212).

2. The self-locking rotating shaft structure according to claim 1, characterized in that: The outer circumferential surface of the second wheel sleeve (22) is provided with a first mounting block (223), and the outer circumferential surface of the damping rotating member (32) is provided with a second mounting block (322). Both the first mounting block (223) and the second mounting block (322) can cooperate with the second flip page (5).

3. The self-locking rotating shaft structure according to claim 2, characterized in that: The second mounting block (322) has a slider (3221) at one end near the second wheel sleeve (22), and the first mounting block (223) has a sliding groove (2231) that cooperates with the slider (3221).

4. The self-locking rotating shaft structure according to claim 3, characterized in that: The stop edge is provided with a stop notch (111), and the second mounting block (322) can slide along the stop notch (111).

5. The self-locking rotating shaft structure according to claim 1, characterized in that: The first snap tooth (211) includes a first steep slope surface (2111) and a first gentle slope surface (2112), and the second snap tooth (221) includes a second steep slope surface (2211) and a second gentle slope surface (2212). When the first flip page (4) and the second flip page (5) are flipped to the optimal working angle, the first steep slope surface (2111) and the second steep slope surface (2211) cooperate, and the first gentle slope surface (2112) and the second gentle slope surface (2212) cooperate. The first gentle slope surface (2112) faces the unfolding direction of the first flip page (4) and the second flip page (5), and the first steep slope surface (2111) faces the closing direction of the first flip page (4) and the second flip page (5).

6. The self-locking rotating shaft structure according to claim 5, characterized in that: The damping sleeve (31) includes two first protrusions (311) that are symmetrical about the axis of the rotating shaft (1). The damping rotating member (32) includes a second protrusion (321) that is symmetrical about the axis of the rotating shaft (1). The top of the first protrusion (311) is a first damping surface (3111), and the top of the second protrusion (321) is a second damping surface (3211). The friction between the first damping surface (3111) and the second damping surface (3211) can generate damping. When the first flip page (4) and the second flip page (5) are unfolded from the closed state, the first damping surface (3111) and the second damping surface (3211) are in contact before the first steep slope surface (2111) and the second steep slope surface (2211) are in contact.

7. The self-locking rotating shaft structure according to claim 6, characterized in that: The first protrusion (311) includes a third steep slope (3112), and the second protrusion (321) includes a fourth steep slope (3212). The third steep slope (3112) faces the unfolding direction of the first flip page (4) and the second flip page (5). When the first flip page (4) and the second flip page (5) are about to unfold to the optimal working angle, the third steep slope (3112) and the fourth steep slope (3212) slide relative to each other. When the third steep slope (3112) and the fourth steep slope (3212) are completely in contact, the first flip page (4) and the second flip page (5) reach the optimal working angle.

8. The self-locking rotating shaft structure according to claim 7, characterized in that: The first protrusion (311) further includes a third gentle slope (3113), and the second protrusion (321) further includes a fourth gentle slope (3213). The third gentle slope (3113) faces the closing direction of the first flip page (4) and the second flip page (5). When the first flip page (4) and the second flip page (5) are closed, the top edge of the third gentle slope (3113) abuts against the top edge of the fourth gentle slope (3213).

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