CN218670176U

CN218670176U - Folding synchronization structure and electronic equipment

Info

Publication number: CN218670176U
Application number: CN202222771042.8U
Authority: CN
Inventors: 骆赛
Original assignee: Wingtech Communication Co Ltd
Current assignee: Wingtech Communication Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2023-03-21
Anticipated expiration: 2032-10-20

Abstract

The utility model discloses a folding synchronous structure and an electronic device, which comprises a base, a synchronous circular tooth, a first bracket and a second bracket; the base is provided with a first sliding chute and a second sliding chute which are arranged in parallel at intervals; a first rack is arranged in the first sliding chute, and a second rack is arranged in the second sliding chute; the first bracket is provided with a first rotating shaft, the first rotating shaft is provided with a first semicircular gear, and the first semicircular gear is meshed with the first rack; the second bracket is provided with a second rotating shaft, the second rotating shaft is provided with a second semicircular gear, and the second semicircular gear is meshed with the second rack; the first rack and the second rack are meshed and connected through the synchronous circular teeth; when the first support rotates around the first rotating shaft, the first rack drives the synchronous circular teeth to rotate, and then the second rack drives the second support to rotate around the second rotating shaft in a synchronous and reverse mode. The utility model discloses a synchronous part mainly relates to rack, gear and half round gear, simple structure, and the equipment is simple and convenient, has reduced processing equipment cost.

Description

Folding synchronization structure and electronic equipment

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electronic equipment technical field especially relates to a folding synchronization structure and electronic equipment.

[ background of the invention ]

As a branch of mobile terminal technology development, because the screen is large and portable, the foldable screen is increasingly used. Wherein, the folding position of folding screen can adopt hinge structure usually, and in order to guarantee that the crease screen has a big fillet simultaneously, hinge structure all designs into the biax basically and is synchronous, and synchronous function's realization often can lead to the structure complicated, and the part is many and the equipment is difficult. For example, the synchronous rotation function is realized by using four circular gears to engage with each other, a special space needs to be designed, and this may increase the thickness of a mobile terminal such as a mobile phone. For example, the adoption of an internal spiral and double-shaft structure can lead to complex structure and difficult processing.

Therefore, it is desirable to provide a foldable synchronization structure and an electronic device to overcome the above-mentioned drawbacks.

[ Utility model ] content

The utility model aims at providing a folding synchronization structure and electronic equipment, the hinge synchronization structure who aims at solving present folding screen has that the structure is complicated, the part is many and the difficult problem of processing equipment, reduces and makes the degree of difficulty and processing equipment cost.

In order to achieve the above object, the utility model provides a folding synchronous structure, which comprises a base, a synchronous circular tooth, a first bracket and a second bracket; the base is provided with a first sliding chute and a second sliding chute which are arranged in parallel at intervals; a first sliding rack is arranged in the first sliding chute, and a second sliding rack is arranged in the second sliding chute; the first bracket is provided with a first rotating shaft, the end part of the first rotating shaft is vertically provided with a first semicircular gear, and the first semicircular gear is meshed with the first rack; the second bracket is provided with a second rotating shaft, the end part of the second rotating shaft is vertically provided with a second semicircular gear, and the second semicircular gear is meshed with the second rack; the first rack and the second rack are also meshed and connected through the synchronous circular teeth; when the first support rotates around the first rotating shaft, the first rack drives the synchronous round teeth to rotate, and then the second rack drives the second support to synchronously and reversely rotate around the second rotating shaft.

In a preferred embodiment, the first rack comprises a first tooth portion, a first tooth surface arranged on one side of the first tooth portion far away from the base, and a second tooth surface arranged on one side of the first tooth portion close to the second rack, and the first semicircular gear is meshed with the first tooth surface; the second rack comprises a second tooth part, a third tooth surface and a fourth tooth surface, the third tooth surface is arranged on one side, far away from the base, of the second tooth part, the fourth tooth surface is arranged on one side, close to the first rack, of the second tooth part, and the second semicircular gear is meshed with the third tooth surface; the opposite sides of the synchronizing scallops are respectively engaged with the second and fourth flanks.

In a preferred embodiment, a first limit groove parallel to the first sliding groove is formed in the bottom wall of the first sliding groove, a first limit block is arranged on one side, away from the first tooth surface, of the first tooth part, and the first limit block is slidably arranged in the first limit groove; and a second limiting groove parallel to the second sliding groove is formed in the bottom wall of the second sliding groove, a second limiting block is arranged on one side, away from the third tooth surface, of the second tooth part, and the second limiting block is slidably arranged in the second limiting groove.

In a preferred embodiment, the first sliding chute and the second sliding chute are consistent in length and are arranged in a staggered mode.

In a preferred embodiment, when two ends of the first semicircular gear are respectively engaged with the first rack, the first rack correspondingly abuts against two ends of the first chute; when the two ends of the second semicircular gear are respectively engaged with the second rack, the second rack correspondingly and respectively abuts against the two ends of the second chute.

In a preferred embodiment, a limit plate is vertically arranged on one side of the base, which is far away from the first bracket, and the limit plate is provided with an arc-shaped guide groove; a guide block is arranged on one side, away from the first support, of the first semicircular gear, and the guide block extends into the guide groove; when the first rotating shaft rotates, the guide block is driven to slide in the guide groove.

In a preferred embodiment, the base is further provided with a circular fixing groove, and the fixing groove is located between the first sliding groove and the second sliding groove; the center of the bottom wall of the fixing groove is provided with a first connecting hole; fixing tables are arranged on two opposite sides of the fixing groove, a fixing block is erected between the two fixing tables, and a second connecting hole is formed in the middle of the fixing block; the synchronous circular teeth are provided with fixing shafts which are coaxially arranged, and two ends of each fixing shaft are connected in the first connecting holes and the second connecting holes respectively, so that the synchronous circular teeth can rotate in the fixing grooves.

In a preferred embodiment, a first arc-shaped block is arranged on one side of the first bracket close to the base, and a second arc-shaped block is arranged on one side of the second bracket close to the base; the base is provided with a first arc-shaped groove corresponding to the first arc-shaped block, and when the first rotating shaft rotates, the first arc-shaped block rotates in the first arc-shaped groove; and the base is provided with a second arc-shaped groove corresponding to the second arc-shaped block, and when the second rotating shaft rotates, the second arc-shaped block rotates in the second arc-shaped groove.

In a preferred embodiment, a first pressing block and a first spring are further arranged in the first arc-shaped groove; one end of the first spring abuts against one end, far away from the first sliding groove, of the first arc-shaped groove, and the other end of the first spring presses the first pressing block on the first arc-shaped block, so that the first arc-shaped block is pressed on one end, close to the first sliding groove, of the first arc-shaped groove; a second pressing block and a second spring are also arranged in the second arc-shaped groove; one end of the second spring abuts against one end, far away from the second sliding groove, of the second arc-shaped groove, and the other end of the second spring enables the second pressing block to be pressed on the second arc-shaped block, so that the second arc-shaped block is pressed on one end, close to the second sliding groove, of the second arc-shaped groove.

The utility model also provides an electronic equipment, include as above any one of embodiment the folding synchronization structure.

The utility model provides a folding synchronization structure and electronic equipment, through the interact of first rack and second rack and synchronous round tooth, thereby when first support rotates round first pivot, because the meshing effect of first semicircular gear and first rack, make first rack slide along first spout one side, then make first rack drive synchronous round tooth rotatory, and then make the second rack carry out the reverse slip along the direction of movement with first rack in the second spout, finally make the second rack drive the second support round the synchronous reverse rotation of second pivot, realized that first support and second support all rotate in opposite directions or the back of the body rotation in step for the symmetry axis between first pivot and the second pivot. Wherein, the synchronizing part of whole structure mainly relates to two racks, a gear and two semicircle gears, simple structure, and the equipment is simple and convenient, has reduced the processing equipment cost. Meanwhile, the synchronous round teeth, the first rack and the second rack are located in the same plane to work, so that the first support and the second support can work at a preset distance above the plane, the occupied space in the vertical direction is small, and the thickness of the mobile terminal can be effectively reduced.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a front view of the folding synchronization structure provided by the present invention;

FIG. 2 is a perspective view of the folding synchronization structure shown in FIG. 1;

FIG. 3 is an exploded perspective view of the folding synchronization structure shown in FIG. 1;

FIG. 4 is a perspective view of the folded synchronization structure of FIG. 1 with portions of the cover hidden;

FIG. 5 is a perspective view of the folded synchronizing structure shown in FIG. 4 from another angle;

fig. 6 is a perspective view of the base in the folded synchronizing structure shown in fig. 1.

Reference numbers in the figures: 100. a folding synchronization structure; 10. a first bracket; 11. a first rotating shaft; 12. a first arc-shaped block; 13. a first pressing block; 14. a first spring; 20. a second bracket; 21. a second rotating shaft; 22. a second arc-shaped block; 23. a second pressing block; 24. a second spring; 30. a base; 31. a first chute; 311. a first limit groove; 32. a second chute; 321. a second limit groove; 33. fixing grooves; 331. a first connection hole; 34. a limiting plate; 341. a guide groove; 35. a first arc-shaped slot; 36. a second arc-shaped slot; 40. synchronous circular teeth; 41. a fixed shaft; 42. a fixed table; 43. a fixed block; 431. a second connection hole; 51. a first rack; 511. a first tooth portion; 512. a first tooth surface; 513. a second tooth surface; 514. a first stopper; 52. a second rack; 521. a second tooth portion; 522. a third tooth surface; 523. a fourth tooth surface; 524. a second limiting block; 61. a first semicircular gear; 611. a guide block; 62. a second semi-circular gear.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantageous technical effects of the present invention more clearly understood, the present invention is further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration only and not by way of limitation.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

The embodiment of the present invention provides a folding synchronization structure 100, which is applied to mobile terminals such as a folding screen mobile phone to ensure the synchronization driving of the folding structure.

As shown in fig. 1 to 6, the folding synchronization structure 100 includes a first bracket 10, a second bracket 20, a base 30 and a synchronization round 40. The first support 10 and the second support 20 are respectively fixed on two folding components of the folding screen mobile phone, so that the first support and the second support can be unfolded to form a plane and can also be folded to be arranged in a joint mode; the base 30 is disposed in the folded portion of the folding screen handset.

The base 30 is provided with a first sliding slot 31 and a second sliding slot 32 which are arranged in parallel at an interval. The first chute 31 and the second chute 32 are both rectangular parallelepiped groove structures. Further, the first runner 31 and the second runner 32 are consistent in length and staggered, i.e. the edges of the two are not aligned so as to enclose a non-rectangular parallelogram structure.

A slidable first rack 51 is provided in the first chute 31. The first rack 51 is linear and can slide longitudinally in the first sliding slot 31. The first bracket 10 is provided with a first rotating shaft 11, and the first rotating shaft 11 is provided at a side of the first bracket 10 close to the second bracket 20, so that the first bracket 10 can rotate around the first rotating shaft 11. The first semicircular gear 61 is vertically disposed at the end of the first rotating shaft 11 near the first sliding chute 31. The first semicircular gear 61 is in a semicircular sheet shape, and the first rotating shaft 11 is perpendicularly connected to the center of the first semicircular gear 61 in the normal direction, so that the first semicircular gear 61 is engaged with the first rack 51. It can be understood that if the first rack 51 is a straight rack, the first semi-circular gear 61 is a straight semi-cylindrical gear; if the first rack 51 is a helical rack, the first semicircular gear 61 is a helical cylindrical gear.

Similarly, a second rack 52 is slidably disposed in the second chute 32. The second rack 52 is linear and longitudinally slidable within the second runner 32. The second bracket 20 is provided with a second rotating shaft 21, and the second rotating shaft 21 is provided at a side of the second bracket 20 close to the first bracket 10, so that the second bracket 20 can rotate around the second rotating shaft 21. A second semicircular gear 62 is vertically arranged at the end part of the second rotating shaft 21 close to one side of the second chute 32. The second semi-circular gear 62 is in a semi-circular shape, and the second rotating shaft 21 is perpendicularly connected to the center of the second semi-circular gear 62 in the normal direction, so that the second semi-circular gear 62 is engaged with the second rack 52. It can be understood that if the first rack 51 is a straight rack, the second rack 52 is also a straight rack, and the second semi-circular gear 62 is correspondingly a straight semi-cylindrical gear; if the first rack 51 is a helical rack, the second rack 52 is also a helical rack, and the second semi-circular gear 62 is a helical cylindrical gear, so as to ensure that the driving modes of the first rack 51 and the second rack 52 are consistent and synchronous.

The common plane of the first rack 51 and the second rack 52 is parallel to the common plane of the first rotating shaft 11 and the second rotating shaft 21 and both located on the same side of the base 30, so as to ensure that the first bracket 10 and the second bracket 20 move towards or away from each other relative to the symmetry axis between the first rotating shaft 11 and the second rotating shaft 21.

Specifically, as shown in fig. 4-5, the first rack 51 and the second rack 52 are also meshed and connected through the synchronizing circular teeth 40. The synchronizing circular gear 40 is a cylindrical gear, and parameters such as tooth height and tooth thickness are consistent with those of the first rack 51 and the second rack 52. The synchronizing ring 40 is mounted with a fixing shaft 41 coaxially disposed, i.e., the synchronizing ring 40 is rotatable around a central axis of the fixing shaft 41. Wherein, the base 30 is further provided with a circular fixing groove 33, and the size of the fixing groove 33 is slightly larger than the synchronous round tooth 40. The fixing groove 33 is located between the first sliding groove 31 and the second sliding groove 32 and located on the same plane. The opposite sides of the fixing groove 33 are provided with fixing platforms 42, and the two fixing platforms 42 are located between the first sliding groove 31 and the second sliding groove 32. A fixing block 43 having a bar shape is installed between the two fixing stages 42. The center of the bottom wall of the fixing groove 33 is opened with a first connecting hole 331, and the middle of the fixing block 43 is opened with a second connecting hole 431. Both ends of the fixing shaft 41 are coupled to the first coupling hole 331 and the second coupling hole 431, respectively, so that the sync round 40 can rotate in the fixing groove 33 to fix the sync round 40.

When the first frame 10 rotates around the first rotating shaft 11, the first rack 51 rotates the synchronizing circular teeth 40, and the second rack 52 rotates the second frame 20 synchronously and reversely around the second rotating shaft 21. For example, when the first support 10 is folded to rotate around the first rotating shaft 11, the first rotating shaft 11 rotates clockwise, and drives the first semicircular gear 61 to rotate clockwise, so that the first rack 51 slides in a direction away from the second support 20, and then the second rack 52 slides in a direction close to the second support 20 through the driving of the synchronizing circular teeth 40, and then drives the second semicircular gear 62 and the second rotating shaft 21 to rotate counterclockwise, and finally the second support 20 rotates around the second rotating shaft 21 to complete the folding operation. That is, the embodiment can realize the synchronous motion between the first support 10 and the second support 20 by the interaction of the two racks, the two semicircular gears and the circular teeth, and has the advantages of less occupied structure, wide part sources, simple and convenient assembly and reduced processing and assembly cost. In addition, the synchronizing circular teeth 40 work in the same plane with the first rack 51 and the second rack 52, and the first support 10 and the second support 20 work in a distance parameter above the plane, so that the occupied space in the vertical direction is small.

In the present embodiment, when the two ends of the first semicircular gear 61 are respectively engaged with the first rack 51, the first rack 51 is correspondingly abutted against the two ends of the first chute 31. That is, when the first rack 51 moves longitudinally to the left and right maximum strokes in the first chute 31, the first rack 51 is engaged with the outermost teeth on both sides of the first semicircular gear 61, so that the first semicircular gear 61 is prevented from rotating and the engaged state with the first rack 51 is released. When the two ends of the second semi-circular gear 62 are respectively engaged with the second rack 52, the second rack 52 correspondingly abuts against the two ends of the second chute 32. That is, when the second rack 52 moves longitudinally to the left and right maximum strokes in the second chute 32, the second rack 52 is engaged with the most edge teeth on both sides of the second semi-circular gear 62, so that the second semi-circular gear 62 is prevented from rotating and the engagement with the second rack 52 is released.

In one embodiment, as shown in fig. 4-5, the first rack 51 includes a first tooth 511, a first tooth surface 512 disposed on a side of the first tooth 511 away from the base 30, and a second tooth surface 513 disposed on a side of the first tooth 511 close to the second rack 52. Specifically, the first tooth 511 has a rectangular bar shape, and the first tooth surface 512 and the second tooth surface 513 are respectively located on one side of the first tooth 511. Similarly, the second rack 52 includes a second tooth 521, a third tooth surface 522 disposed on a side of the second tooth 521 away from the base 30, and a fourth tooth surface 523 disposed on a side of the second tooth 521 close to the first rack 51. Specifically, the second tooth 521 is in a shape of a strip-shaped rectangular parallelepiped, and the third tooth surface 522 and the fourth tooth surface 523 are respectively located on one side surface of the second tooth 521.

The first semicircular gear 61 is meshed with the first tooth surface 512, the second semicircular gear 62 is meshed with the third tooth surface 522, and two opposite sides of the synchronous circular tooth 40 are respectively meshed with the second tooth surface 513 and the fourth tooth surface 523, so that the first semicircular gear 61 and the first rack 51 can be driven mutually, the second semicircular gear 62 and the second rack 52 can be driven mutually, and the first rack 51 and the second rack 52 can be moved reversely through the synchronous circular tooth 40.

Further, as shown in fig. 6, a first limiting groove 311 parallel to the first sliding groove 31 is formed in the bottom wall of the first sliding groove 31, a first limiting block 514 is disposed on a side of the first tooth 511 away from the first tooth surface 512, and the first limiting block 514 is slidably disposed in the first limiting groove 311, so as to limit the movement of the first rack 51 in the first sliding groove 31. A second limiting groove 321 parallel to the second sliding groove 32 is formed in the bottom wall of the second sliding groove 32, a second limiting block 524 is arranged on one side, away from the third tooth surface 522, of the second tooth 521, and the second limiting block 524 is slidably arranged in the second limiting groove 321, so that the movement of the second rack 52 in the second sliding groove 32 can be limited.

In one embodiment, as shown in fig. 3, 4 and 6, a limit plate 34 is vertically disposed on a side of the base 30 away from the first bracket 10, and the limit plate 34 is provided with a guide groove 341 having a circular arc shape. A guide block 611 is arranged on one side, away from the first bracket 10, of the first semicircular gear 61, and the guide block 611 extends into the guide groove 341; when the first rotating shaft 11 rotates, the guide block 611 is driven to slide in the guide groove 341. It can be understood that, when the first semicircular gear 61 rotates synchronously with the first rotating shaft 11, the motion track of the guide block 611 disposed on the first semicircular gear 61 is arc-shaped, and the cross-sectional extending direction of the guide groove 341 is consistent with the motion track, so that the guide block 611 can move in the guide groove 341, thereby limiting the rotation of the first semicircular gear 61.

In one embodiment, as shown in fig. 3, 5 and 6, a first arc-shaped block 12 is disposed on one side of the first bracket 10 close to the base 30, and a second arc-shaped block 22 is disposed on one side of the second bracket 20 close to the base 30. The base 30 is provided with a first arc-shaped groove 35 corresponding to the first arc-shaped block 12, and when the first rotating shaft 11 rotates, the first arc-shaped block 12 rotates in the first arc-shaped groove 35. The base 30 is provided with a second arc-shaped groove 36 corresponding to the second arc-shaped block 22, and when the second rotating shaft 21 rotates, the second arc-shaped block 22 rotates in the second arc-shaped groove 36. That is, when the first support 10 and the second support 20 perform folding or stretching actions, the rotation directions of the first rotating shaft 11 and the second rotating shaft 21 are corrected by the limiting action of the first arc-shaped block 12 and the second arc-shaped block 22, so as to ensure that the first rotating shaft 11 and the second rotating shaft 21 can be parallel at equal intervals during rotation.

Further, a first pressing block 13 and a first spring 14 are further arranged in the first arc-shaped groove 35. One end butt of first spring 14 is kept away from the one end of first spout 31 in first arc wall 35, thereby the other end of first spring 14 makes first arc piece 12 pressfitting be close to the one end of first spout 31 in first arc wall 35 with first briquetting 13 pressfitting on first arc piece 12 to spacing first support 10, thereby avoid first support 10 to take place longitudinal movement and lead to first semicircle gear 61 to break away from first rack 51. The second arc-shaped groove 36 is also internally provided with a second pressing block 23 and a second spring 24. One end of the second spring 24 abuts against one end, far away from the second sliding groove 32, of the second arc-shaped groove 36, and the other end of the second spring 24 presses the second pressing block 23 on the second arc-shaped block 22, so that the second arc-shaped block 22 is pressed at one end, close to the second sliding groove 32, of the second arc-shaped groove 36, and therefore the second support 20 is limited, and the second support 20 is prevented from longitudinally moving, so that the second semicircular gear 62 is separated from the second rack 52. It should be noted that the first pressing block 13 and the second pressing block 23 may be integrally designed, so that the pressing actions of the first pressing block 13 and the second pressing block 23 are synchronized.

The present invention also provides an electronic device, comprising the folding synchronization structure 100 according to any of the above embodiments.

To sum up, the utility model provides a folding synchronization structure 100 and electronic equipment, through the interact of first rack 51 and second rack 52 with synchronous circular tooth 40, thereby when first support 10 rotates round first pivot 11, because the meshing effect of first semicircle gear 61 and first rack 51, make first rack 51 slide along first spout 31 one side, then make first rack 51 drive synchronous circular tooth 40 rotatory, and then make second rack 52 carry out the reverse slip along the direction of movement with first rack 51 in second spout 32, finally make second rack 52 drive second support 20 round the synchronous antiport of second pivot 21, realized that first support 10 and second support 20 all carry out synchronous rotation in opposite directions or rotation back of the body mutually for the symmetry axis between first pivot 11 and the second pivot 21. Wherein, the synchronizing part of whole structure mainly relates to two racks, a gear and two semicircle gears, simple structure, and the equipment is simple and convenient, has reduced the processing equipment cost. Meanwhile, the synchronizing circular teeth 40, the first rack 51 and the second rack 52 work in the same plane, so that the first support 10 and the second support 20 can work at a preset distance above the plane, and therefore, the occupied space in the vertical direction is small, and the thickness of the mobile terminal can be effectively reduced.

The invention is not limited solely to that described in the specification and the embodiments, and additional advantages and modifications will readily occur to those skilled in the art, and it is not intended to be limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims

1. A folding synchronous structure is characterized by comprising a base, a synchronous circular tooth, a first support and a second support; the base is provided with a first sliding chute and a second sliding chute which are arranged in parallel at intervals; a first sliding rack is arranged in the first sliding chute, and a second sliding rack is arranged in the second sliding chute; the first bracket is provided with a first rotating shaft, the end part of the first rotating shaft is vertically provided with a first semicircular gear, and the first semicircular gear is meshed with the first rack; the second bracket is provided with a second rotating shaft, the end part of the second rotating shaft is vertically provided with a second semicircular gear, and the second semicircular gear is meshed with the second rack; the first rack and the second rack are also meshed and connected through the synchronous circular teeth; when the first support rotates around the first rotating shaft, the first rack drives the synchronous circular teeth to rotate, and then the second rack drives the second support to synchronously and reversely rotate around the second rotating shaft.

2. The folding synchronization structure of claim 1, wherein the first rack comprises a first tooth portion, a first tooth surface disposed on a side of the first tooth portion away from the base, and a second tooth surface disposed on a side of the first tooth portion adjacent to the second rack, and the first semicircular gear is engaged with the first tooth surface; the second rack comprises a second tooth part, a third tooth surface and a fourth tooth surface, the third tooth surface is arranged on one side, far away from the base, of the second tooth part, the fourth tooth surface is arranged on one side, close to the first rack, of the second tooth part, and the second semicircular gear is meshed with the third tooth surface; the opposite sides of the synchronizing scallops are respectively engaged with the second and fourth flanks.

3. The folding synchronization structure of claim 2, wherein a first limiting groove parallel to the first sliding groove is formed in a bottom wall of the first sliding groove, a first limiting block is disposed on a side of the first tooth portion away from the first tooth surface, and the first limiting block is slidably disposed in the first limiting groove; and a second limiting groove parallel to the second sliding groove is formed in the bottom wall of the second sliding groove, a second limiting block is arranged on one side, away from the third tooth surface, of the second tooth part, and the second limiting block is slidably arranged in the second limiting groove.

4. The folding synchronization structure of claim 1, wherein the first and second chutes are identical in length and are staggered.

5. The folding synchronization structure of claim 4, wherein when two ends of the first semicircular gear are respectively engaged with the first rack, the first rack is correspondingly abutted against two ends of the first chute; when the two ends of the second semicircular gear are respectively engaged with the second rack, the second rack correspondingly and respectively abuts against the two ends of the second chute.

6. The folding synchronization structure of claim 1, wherein a limiting plate is vertically disposed on a side of the base away from the first bracket, and the limiting plate is provided with an arc-shaped guide groove; a guide block is arranged on one side, away from the first support, of the first semicircular gear, and the guide block extends into the guide groove; when the first rotating shaft rotates, the guide block is driven to slide in the guide groove.

7. The folding synchronization structure of claim 1, wherein the base further defines a circular fixing groove, and the fixing groove is located between the first sliding groove and the second sliding groove; the center of the bottom wall of the fixing groove is provided with a first connecting hole; fixing tables are arranged on two opposite sides of the fixing groove, a fixing block is erected between the two fixing tables, and a second connecting hole is formed in the middle of the fixing block; the synchronous circular teeth are provided with fixing shafts which are coaxially arranged, and two ends of each fixing shaft are connected in the first connecting holes and the second connecting holes respectively, so that the synchronous circular teeth can rotate in the fixing grooves.

8. The folding synchronizing structure of claim 1, wherein a first arc-shaped block is arranged on one side of the first bracket close to the base, and a second arc-shaped block is arranged on one side of the second bracket close to the base; the base is provided with a first arc-shaped groove corresponding to the first arc-shaped block, and when the first rotating shaft rotates, the first arc-shaped block rotates in the first arc-shaped groove; and the base is provided with a second arc-shaped groove corresponding to the second arc-shaped block, and when the second rotating shaft rotates, the second arc-shaped block rotates in the second arc-shaped groove.

9. The folding synchronizing structure of claim 8, wherein a first pressing block and a first spring are further arranged in the first arc-shaped groove; one end of the first spring abuts against one end, far away from the first sliding groove, of the first arc-shaped groove, and the other end of the first spring presses the first pressing block on the first arc-shaped block, so that the first arc-shaped block is pressed on one end, close to the first sliding groove, of the first arc-shaped groove; a second pressing block and a second spring are also arranged in the second arc-shaped groove; one end of the second spring abuts against one end, far away from the second sliding groove, of the second arc-shaped groove, and the other end of the second spring enables the second pressing block to be pressed on the second arc-shaped block, so that the second arc-shaped block is pressed on one end, close to the second sliding groove, of the second arc-shaped groove.

10. An electronic device, characterized in that it comprises a folding synchronization structure according to any one of claims 1 to 9.