CN210318150U - Balanced control mechanism, folding display device and communication equipment - Google Patents

Abstract

A balance control mechanism comprises a pair of fixed seats, a pair of rotating seats, a first clamping seat, a second clamping seat and a transmission assembly, wherein each rotating seat comprises a seat body, an arc-shaped groove formed in the seat body and a tooth structure formed by extending from the lower side of the arc-shaped groove of the seat body in a lateral direction; the application also provides a folding display device and communication equipment.

Description

Balanced control mechanism, folding display device and communication equipment

Technical Field

The present application relates to the field of communications electronics, and more particularly, to a balance control mechanism, a foldable display device, and a communication apparatus.

Background

With the development of the folding screen technology, the folding screen mobile phone has become a hot spot technology. Although the folding screen can be bent, the 180-degree bending cannot be realized, and the bent part still needs to keep a certain R angle, otherwise the screen can be damaged. The existing folding mode is divided into inward folding and outward folding, namely the screen is positioned at the inner side or the outer side after being folded, for example, Mate X issued by Huawei is outward folding, but the outward folding has the problems that the screen is in an exposed state and is easily scratched by a hard object, and the folding screen is fragile.

In addition, the folding mechanisms for connecting two folding screens for folding at present are very complicated in structure, one small folding mechanism even reaches hundreds of components assembled together, and the small folding mechanism is controlled by the complicated mechanism, so that the instability of the mechanism is increased, and the mechanism is also one of the main reasons that the existing folding screen mobile phone cannot be put on the market in large batch.

SUMMERY OF THE UTILITY MODEL

In view of this, it is desirable to provide an equalization control mechanism, a foldable display device and a communication apparatus, wherein the equalization control mechanism has a simple structure and good stability.

In order to solve the above technical problem, the present application provides a balance control mechanism, which includes a pair of fixing bases located at the outermost side, a pair of rotating bases located at the inner sides of the pair of fixing bases, a first clamping base and a second clamping base located between the pair of rotating bases, and a transmission assembly clamped between the first clamping base and the second clamping base, wherein the rotating bases include a base body, an arc-shaped groove formed on the base body, and a tooth structure formed by extending from the lower side of the arc-shaped groove of the base body in the lateral direction, the transmission assembly includes two first shaft bodies with two ends limited on the first clamping base and the second clamping base, two first gears fixed on the first shaft bodies, a second shaft body passing through the first clamping base and the arc-shaped groove and with two ends limited on the fixing base and the second clamping base, and a second shaft body passing through the second clamping base and the arc-shaped groove and with two ends limited on the first clamping base and the fixing base respectively, Be fixed in on the second axle body respectively with second gear and third gear of first gear, tooth structure interlock, it is located respectively to rotate the seat the diagonal outside of first, second grip slipper, when rotating the seat and rotating, tooth structure drive the third gear, the third gear passes through the drive of second axle body the mutual interlock of first gear rotates, realizes two synchronous rotations that rotate the seat.

Preferably, the balance control mechanism further includes a clamp plate sleeved on the pair of first shaft bodies, and a spring sleeved on the first shaft bodies and clamped between the clamp plate and the first clamping seat or the second clamping seat, wherein the spring provides an elastic force to prevent the first gear and the second gear from being clamped by the first clamping seat and the second clamping seat.

Preferably, the fixing seat, the first clamping seat and the second clamping seat are fixed on a back cover, the back cover comprises a cover body, a back cover cavity arranged on the inner side of the cover body and a plurality of fixing pieces arranged on the top wall of the back cover cavity, and the tops of the fixing seat, the first clamping seat and the second clamping seat are fastened together with the fixing pieces.

Preferably, the upper surface of fixing base, first, second holder is ARC structure, the back of the body lid cavity form with ARC structure matching, sunken cooperation fixed part that forms in the middle of the top of fixing base, the sunken fixed slot that forms in top of first, second holder, the mounting is for certainly the protruding structure that the back of the body lid cavity protrusion formed, the mounting hold in cooperation fixed part with fasten in the fixed slot.

Preferably, the fixed seat and the bottom middle positions of the first and second clamping seats are respectively provided with a avoiding portion, a first avoiding portion and a second avoiding portion, the matching fixed portion and the fixed groove are provided with a fixed hole and a screw hole which penetrate through the avoiding portion and the first and second avoiding portions in the vertical direction, and the fixed seat and the first and second clamping seats penetrate through the fixed hole and the screw hole from the avoiding portion and the first and second avoiding portions through bolts and are fastened on the fixed member of the back cover.

Preferably, the bottom surfaces of the two rotating seats are respectively fixed on a first folding plate and a second folding plate, the first folding plate faces the lateral edge of the second folding plate and is provided with a first protruding portion and a first notch, and the second folding plate faces the lateral edge of the first folding plate and is provided with a second notch for accommodating the first protruding portion and a second protruding portion accommodating the first notch.

Preferably, the two rotating seats are at least partially fixed on the first and second protruding portions, respectively, and an arc-shaped top surface matched with the back cover cavity of the back cover is formed at the top of the seat body of the rotating seat.

Preferably, the sliding track of the rotating shaft in the arc-shaped groove of the rotating seat is consistent with the folding track of the first folding plate and the folding track of the second folding plate.

Preferably, the first clamping seat and the second clamping seat are respectively provided with a limiting hole at the corresponding position for limiting two end parts of the first shaft body; through holes for the second shaft to pass through or limit are respectively formed in the positions, corresponding to the second shaft, of the first clamping seat and the second clamping seat; the position of the fixed seat corresponding to the through hole is provided with a shaft hole; the horizontal position of the axis of the first gear is higher than that of the second gear, and the radius of the first gear is larger than that of the second gear.

Preferably, the first clamping seat is recessed towards the top of one side of the first gear to form a damping groove, and a damping piece clamped on the pair of first shaft bodies is installed in the damping groove.

Preferably, the end face of the second clamping seat facing the first clamping seat is recessed at a position corresponding to the limiting hole of the first shaft body to form a clamping groove, a clamping block matched with the clamping groove is sleeved on the first shaft body, and the clamping block can be clamped in the clamping groove or moved out of the clamping groove in different states.

Preferably, the spring is clamped between the clamping plate and the clamping block.

In order to solve the technical problem, the application further provides a foldable display device, which comprises the connecting mechanism.

In order to solve the technical problem, the application further provides a communication device comprising the folding display device.

The balance control mechanism comprises a first shaft body, a second shaft body, a pair of first gears and a pair of second gears, wherein the first gears and the second gears are meshed to rotate, and when the first folding plate or the second folding plate is folded, the first folding plate and the second folding plate are folded at the same angle by transmission of the first gears and the second gears, so that the balance control of the first folding plate and the second folding plate is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1 is a perspective view of a communication device of the present application;

FIG. 2 is a perspective view of a foldable display device according to the present application;

FIG. 3 is an exploded perspective view of the foldable display device of the present application;

FIG. 4 is a drawing showing the back cover, the connection mechanism and the balance control mechanism of the foldable display device according to the present invention;

FIG. 5 is a perspective view of a back cover of the foldable display device of the present application;

FIG. 6 is a drawing showing the back cover, the connection mechanism and the balance control mechanism of the foldable display device according to the present invention;

FIG. 7 is a perspective view of the coupling mechanism of the present application in an expanded state;

FIG. 8 is an exploded perspective view of the attachment mechanism of the present application;

FIG. 9 is a perspective view of the rotating base of the coupling mechanism of the present application;

FIG. 10 is a perspective view of the coupling mechanism of the present application showing the base and the gears between the bases;

FIG. 11 is a perspective view of the coupling mechanism of the present application in a folded condition;

FIG. 12 is a perspective view of the equalizing control mechanism of the present application in an expanded state;

FIG. 13 is an exploded perspective view of the equalization control mechanism of the present application;

FIG. 14 is a perspective view of a drive member of the equalizing control mechanism of the present application;

FIG. 15 is a perspective view of a first clamping seat of the equalizing control mechanism of the present application;

FIG. 16 is a perspective view of a second chuck of the equalizing control mechanism of the present application;

FIG. 17 is a gear snap-fit condition diagram of the balance control mechanism of the present application;

FIG. 18 is a perspective view of a damping member of the equalizing control mechanism of the present application;

fig. 19 is a perspective view of the equalization control mechanism of the present application in a folded state.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 to 6, the communication device of the present application includes a first folding plate 11, a second folding plate 12, a connecting mechanism 40 and a balance control mechanism 60 connected to opposite side edges of the first folding plate 11, 12, a back cover 20 fixing the connecting mechanism 40 and the balance control mechanism 60, a first housing 31 and a second housing 32 fixed to outer sides of the first folding plate 11, 12, and a folding screen (not shown) attached to inner side surfaces of the first folding plate 11, 12 away from the back cover 20.

A plurality of first notches 111 and 114 and a plurality of first protrusions 112 and 113 are formed on the first folding plate 11 at the opposite side corresponding to the connection mechanism 40 and the balance control mechanism 60; the second folding plate 12 is provided with a plurality of second notches 122 and 123 and second protrusions 121 and 124 on the opposite side of the connecting mechanism 40 and the balance controlling mechanism 60. The first protrusions 112, 113 are respectively and correspondingly accommodated in the second notches 122, 123, and the second protrusions 121, 124 are respectively and correspondingly accommodated in the first notches 122, 123.

The back cover 20 comprises a cover body 21, wrapping walls 22 arranged at two longitudinal ends of the cover body 21, a back cover cavity 23 arranged on the inner side of the cover body 21, and a plurality of fixing pieces 24 and 25 arranged on the top wall of the back cover cavity 23. The back cover cavity 23 is an arc-shaped cavity, and the outer surface of the cover body 21 is also an arc-shaped outer surface. The fixing pieces 24 and 25 are fixing protrusions formed by protruding from the middle of the top wall (or the bottom wall) of the arc-shaped cavity 23 towards the back cover cavity 23, and fastening holes 26 are formed in the fixing protrusions.

The first and second housings 31 and 32 are fixed on the first and second folding plates 11 and 12, respectively, and electronic components are installed in the first and second housings 31 and 32 and electrically connected with the folding screen, so as to form the communication equipment, such as a mobile phone.

When the first and second folding plates 11, 12 are in the unfolded state, the opposite sides of the first and second housings 31, 32 approach each other until they contact each other, and at this time, the back cover 20 is hidden inside the first and second housings 31, 32, so that a better appearance is achieved without discomfort of the protruding surface of the back cover. When the first and second folding plates 11, 12 are folded, the opposite sides of the first and second housings 31, 32 are separated from each other until they are parallel after a certain distance is left, at this time, the back cover 20 is exposed outside the first and second housings 31, 32, and the edges of the opposite sides of the first and second housings 31, 32 are respectively attached to the edge of the cover body 21 of the back cover 20.

The communication equipment of this application passes through first, second shell 31, 32 cover when the expansion state back of the body lid 20 makes back of the body lid 20 is in hidden state, realizes the planarization at the communication equipment back, and the outward appearance is better, and is suitable for the flat desktop of arranging in, prevents crooked.

As shown in fig. 6 to 11, the connecting mechanism 40 of the present application includes at least three fixing seats 41, two rotating seats 42 and a pair of transmission gears 43.

The fixing base 41 includes two outer fixing bases 411 located at the outer side and a middle fixing base 412 located between the two outer fixing bases 411. The rotating seat 42 and the transmission gear 43 are divided into two pairs, and the two pairs are respectively clamped between an outer fixed seat 411 and the middle fixed seat 412 and are arranged in a staggered manner in the transverse direction.

Each fixing seat 41 includes an arc-shaped base 417 engaged with the back cover cavity 23 of the back cover 20, a bottom 418 located at the bottom side of the arc-shaped base 417 and having a planar structure, a matching fixing portion 416 opened at the arc-shaped top of the arc-shaped base 417, a space-avoiding portion 414 located in the middle of the bottom 418 and partially removed, and a fixing hole 413 passing through the matching fixing portion 416. The fixing portion 416 is a recessed structure and receives the protruding fixing member 24 on the top surface of the back cover cavity 23 of the back cover 20 therein, and is fastened in the fastening hole 26 of the back cover 20 by a fixing bolt passing through the fixing hole 413 from the avoiding portion 414, thereby fixing the fixing base 41 to the back cover 20. Shaft holes 415 are formed in two sides of an arc-shaped base 417 of the fixing seat 41, only one shaft hole 415 can be formed in the outer fixing seat 411, and the shaft holes 415 of the two outer fixing seats 411 are located in different two sides and are staggered with each other.

Referring to fig. 9, the rotating base 42 includes a base 421, an arc top surface 422 disposed on the top surface of the base 421, a bottom surface 425 disposed at the bottom of the base 421, an arc groove 423 disposed in the base 421, and a tooth structure 424 formed by extending transversely from the middle of the lower portion of the arc groove 423 of the base 421. The curved slot 423 is concentric with the curved top surface 422. The arc-shaped top surface 422 is matched with a part of the arc-shaped cavity of the back cover cavity 23 of the back cover 20, so that the rotating seat 42 can rotate around the arc-shaped back cover cavity 23. The arc-shaped top surface 422 of the rotating seat 42 and the arc-shaped back cover cavity 23 rotate to conform to the optimal folding track of the folding screen.

The transmission gear 43 includes a rotating shaft 431 and a gear 432 fixed to the rotating shaft 431. The first end of the rotating shaft 431 is limited in a shaft hole 415 of the middle fixing seat 412, and the second end of the rotating shaft 431 passes through the arc-shaped groove 423 of the rotating seat 42 and then is limited in a shaft hole 415 of the outer fixing seat 411. The first ends of the rotating shafts 431 of the two transmission gears 43 are respectively limited in the shaft holes 415 at the two lateral sides of the middle fixing seat 411. At the same time, the gear 432 engages with the tooth structure 424 of the rotary seat 42.

In practice, the two rotating bases 42 are fixed to the first and second folding plates 11, 12 respectively, that is, the bottom surface 425 of the one rotating base 42 is fixed to the first folding plate 11 and the bottom surface 425 of the one rotating base 42 is at least partially fixed to the first protrusion 112 on the first folding plate 11; the bottom surface 425 of the other rotating base 42 is fixed to the second folding plate 12 and the bottom surface 425 of the rotating base 42 is at least partially fixed to the second protrusion 121 of the second folding plate 12. When the first folding plate 11 and the second folding plate 12 are in the connected and unfolded state, the rotating seat 42 on the first protruding portion 112 of the first folding plate 11 is located on the second notch 122 of the second folding plate 12; the rotating seat 42 on the second protrusion 121 of the second folding plate 12 is located on the first notch 111 of the first folding plate 11.

When the connecting mechanism 40 of the present application is actuated, the first and second folding plates 11 and 12 respectively drive the two rotating bases 42 located thereon to rotate around the arc-shaped surface of the back cover cavity 23 of the back cover 20, at this time, the tooth structure 424 on the rotating base 42 drives the gear 432 of the transmission gear 43 to rotate, so that the rotating shaft 431 rotates around the arc-shaped groove 423 of the rotating base 42 until the tooth structure 424 of the rotating base 42 rotates from the initial position to the end position (mainly shown in fig. 11). The arc track of the arc groove 423 of the rotating seat 42 is matched with the folding track of the folding screen, so that the folding path of the folding screen is ensured to accord with the optimal path, and the folding screen is prevented from being damaged.

The utility model provides a coupling mechanism 40 rotates seat 42 and a drive gear 43 through misplacing centre gripping one respectively between three fixing base 41, and locates rotate the gear 432 rotation of the last tooth structure 424 interlock drive gear 43 of seat 42 to be spacing through drive gear 43's pivot in realize in the arc wall 423 of rotating seat 42 right the restriction of rotating seat 42 position, the arc wall 423 of rotating seat 42 winds the pivot 431 rotates and realizes the expansion and the closure of first, second folded sheet 11, 12.

As shown in fig. 12 to 19, the balance control mechanism 60 of the present application includes a pair of fixed seats 41 respectively located at the outermost sides, a pair of rotating seats 42 respectively located at the inner sides of the pair of fixed seats 41, first and second clamping seats 63, 64 located between the pair of rotating seats 42, and a transmission assembly 67 clamped between the first and second clamping seats 63, 64.

Referring to fig. 15, the structures of the fixed seat 41, the rotating seat 42 and the fixed seat and the rotating seat of the connecting mechanism 40 are completely the same, and the operation principles are also completely the same, which are not described herein again. The first clamping base 63 includes a first clamping base 631, a first arc-shaped top surface 632 formed on the top of the first clamping base 631, a pair of through holes 636 longitudinally penetrating the first clamping base 631, and a limiting hole 635 located between the pair of through holes 636 and having a horizontal position higher than the through hole 636. The first clamping seat body 631 is recessed from the first arc-shaped top surface 632 at a side close to the second clamping seat 64 to form a damping groove 634, and the damping groove 634 includes a pair of grooves 6341 corresponding to the limiting hole 635 and a protruding portion 6342 protruding between the pair of grooves 6341. The first clamping seat body 631 is separated from the second clamping seat 64 by a fixing groove 633 formed by downwardly sinking from the first arc top surface 632, and the fixing groove 633 penetrates the first clamping seat body 631 in the vertical direction to form a screw hole 6331. The middle of the bottom of the first clamping seat 631 is provided with a first avoiding portion 637.

Referring to fig. 16, the second clamping seat 64 includes a second clamping seat body 641, a second arc-shaped top surface 642 formed above the second clamping seat body 641, a through hole 646 longitudinally penetrating the second clamping seat body 641 and corresponding to the first through hole 636, and a limiting hole 645 corresponding to the limiting hole 635. The second clamping seat 641 penetrates the second clamping seat 641 to form a pair of clamping grooves 644 at an outer edge of a side of the second clamping seat 641 close to the first clamping seat 63, and the pair of clamping grooves 644 respectively correspond to the positions of the limiting holes 645. A fixing groove 643 formed by recessing the second holder body 641 from the second arc-shaped top surface 642 at a side of the second holder body 641 away from the first holder 63, wherein the fixing groove 643 forms a screw hole (not numbered) penetrating the second holder body 641 in the vertical direction. A second avoiding portion 647 is disposed in the middle of the bottom of the second clamping seat body 641.

The transmission assembly 67 includes a pair of first shafts 671 clamped between the limiting holes of the first clamping seat 63 and the limiting holes 645 of the second clamping seat 64, a first gear 672 fixed on the first shafts 671, a pair of second shafts 673, a second gear 675 fixed on the second shafts 673 and engaged with the first gear 672, and a third gear 674 fixed on the second shafts 673 and engaged with the tooth structure 424 of the rotating seat 42. A first end of a second shaft body 673 is limited in the first through hole 636 of the first clamping seat 63, and a second end of the second shaft body 673 passes through the through hole 646 of the second clamping seat 64 and the arc-shaped groove 423 of the rotating seat 42 and then is limited in the shaft hole 415 of the fixed seat 41. The second gear 675 and the third gear 674 are respectively located at two ends of the second clamping seat 64. The first end of the second shaft body 673 is limited in the through hole 646 of the second clamping seat 64, and the second end of the second shaft body 673 passes through the first through hole 636 of the first clamping seat 63 and the arc-shaped groove 423 of the rotating seat 42 and then is limited in the shaft hole 415 of the fixed seat 41. The second gear 675 and the third gear 674 are respectively located at two ends of the second clamping seat 64.

The balance control mechanism 60 further includes a clamp plate 65 sleeved outside the first shaft body 671 and the second shaft body 673, a plurality of damping elements 69 clamped outside the pair of first shaft bodies 671 and accommodated in the damping grooves 634 of the clamping seats 63, a concave-convex wheel 68 fixed outside the pair of first shaft bodies 671 and matched with the clamping grooves 644 of the second clamping seats 64, and a spring 66 sleeved outside the first shaft body 67 and having two ends abutting against the clamp plate 65 and the concave-convex wheel 68.

Referring to fig. 18, the damping member 69 includes a connection part 691 and first and second clamping holes 692, 693 formed at both ends of the connection part 691. The outer ends of the first and second clamping holes 692, 693 are provided with an open end 694, the connecting portion 691 is located on the protruding portion 6342 of the damping slot 634, and the first and second clamping holes 692, 693 respectively clamp one first shaft 671 and are located in the groove 6341. The first and second clamping holes 692, 693 have inner diameters smaller than outer diameters of the first shaft body 671 at corresponding positions to apply a resistance to the first shaft body 671.

As shown in fig. 13, the concave-convex wheel 68 includes an annular main body 681 and a pair of locking blocks 682 extending from the annular main body 681 toward the locking groove 644, and the locking blocks 682 are accommodated in the locking groove 644 and can move out of the locking groove 644 to abut against a side wall surface of the second clamping seat 64 during rotation. The spring 66 provides an elastic force to the concave-convex cam 68.

The fixing seat 41, the first clamping seat 63, and the second clamping seat 64 of the balance control mechanism 60 of the present application are all fixed on the fixing member 25 of the back cover 20. The first and second escape portions 637, 647 under the fixed base 41 and the first and second clamping bases 63, 64 are fastened to the fixed members 24, 25 through the fixed holes 413 and the screw holes 6331 by bolts. The fixing members 24 and 25 are respectively accommodated in the fixing groove 633 and 643 of the cooperating fixing portion 416 of the fixing base 41 and the top of the first and second clamping bases 63 and 64. The bottom surface 425 of the rotating seat 42 is fixed on the first folding plate 11 and the second folding plate 12 respectively, one of the rotating seats 42 is fixed on the first protruding portion 113 of the first folding plate 11, the other rotating seat 42 is fixed on the second protruding portion 124 of the second folding plate 12, meanwhile, the first protruding portion 113 is contained in the second notch 123 of the second folding plate 12 when the balance control mechanism is unfolded, and the second protruding portion 124 is contained in the first notch 114 of the first folding plate 11.

The operation principle of the balance control mechanism 60 of the present application is as follows:

when the first and second folding plates 11, 12 rotate, the two rotating seats 42 are respectively driven to rotate, and the tooth structure 424 of the rotating seat 42 drives the third gear 674 at one end of the second shaft body 673 to rotate, so as to drive the second gear 675 at the other end of the second shaft body 673 to rotate, and when the second gear 675 rotates, the first gear 672 on the first shaft body 671 is driven to rotate. The damping member 69 clamped on the first shaft body 673 applies resistance to the first shaft body 673, so that the first and second folding plates 11, 12 can stay at any folding position during the rotation process. The concave-convex wheel 68 is clamped into the clamping groove 644 and retreats from the clamping groove 644 under the elastic force of the spring 66, so that folding hand feeling is realized, namely, when the clamping block 682 of the concave-convex wheel 68 is clamped into the clamping groove 644, obvious hand feeling is generated to prompt the folding completion state.

With particular reference to fig. 17, the radius of the second gear 675 is less than the radius of the first gear 672. The bottom of the clamping plate 65 is also provided with a space 651 for avoiding position, and the first gear 672 and the second gear 675 are arranged along the edge of the space 651 for avoiding position. The provision of four meshing gears allows the radii of the gears to be reduced and the same drive distance to be achieved, i.e. the thickness of the balance control mechanism 60 to be reduced.

The balance control mechanism 60 of the present application, by providing a pair of first shafts 671 and a pair of second shafts 673 and engaging and rotating a pair of first gears 672 with a pair of second gears 675 on the first shafts, folds the first and second folding plates 11, 12 by the same angle when the first or second folding plates 11, 12 are folded, necessarily by the transmission of the first and second gears 672, 675. Meanwhile, through the arrangement of the damping piece 69 and the concave-convex wheel 68, the better experience of the user on the folding angle positioning and the folding hand feeling is enhanced.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (14)

1. A balance control mechanism is characterized by comprising a pair of fixed seats respectively positioned at the outermost sides, a pair of rotating seats respectively positioned at the inner sides of the pair of fixed seats, a first clamping seat and a second clamping seat positioned between the pair of rotating seats, and a transmission assembly clamped between the first clamping seat and the second clamping seat, wherein the rotating seats comprise seat bodies, arc-shaped grooves formed in the seat bodies, and tooth structures formed by extending from the lower sides of the arc-shaped grooves of the seat bodies in a lateral direction, the transmission assembly comprises two first shaft bodies, two first gears, a second shaft body, a third shaft body and a third shaft body, the two first shaft bodies are fixed on the first shaft bodies, the second shaft bodies penetrate through the first clamping seats and the arc-shaped grooves, the two ends of the second shaft bodies penetrate through the second clamping seats and the arc-shaped grooves, and are respectively limited on the first clamping seats and the fixed seats, the two ends of the second shaft bodies are respectively, Be fixed in on the second axle body respectively with second gear and third gear of first gear, tooth structure interlock, it is located respectively to rotate the seat the diagonal outside of first, second grip slipper, when rotating the seat and rotating, tooth structure drive the third gear, the third gear passes through the drive of second axle body the mutual interlock of first gear rotates, realizes two synchronous rotations that rotate the seat.

2. The balance control mechanism according to claim 1, further comprising a clamp plate disposed on the pair of first shafts, and a spring disposed on the first shafts and clamped between the clamp plate and the first or second clamping seat, wherein the spring provides a resilient force to prevent the first and second clamping seats from clamping the first and second gears.

3. The balance control mechanism according to claim 2, wherein the fixed seat and the first and second clamping seats are fixed on a back cover, the back cover comprises a cover body, a back cover cavity opened inside the cover body, and a plurality of fixing members arranged on a top wall of the back cover cavity, and the fixed seat, the tops of the first and second clamping seats and the fixing members are fastened together.

4. The balance control mechanism according to claim 3, wherein the upper surfaces of the fixing base, the first clamping base and the second clamping base are cambered structures, the back cover cavity forms a cambered structure matched with the cambered structures, the middle recess at the top of the fixing base forms a concave matching fixing part, the top recesses of the first clamping base and the second clamping base form a fixing groove, the fixing member is a protruding structure protruding from the back cover cavity, and the fixing member is accommodated in the matching fixing part and fastened in the fixing groove.

5. The balance control mechanism according to claim 4, wherein the fixing base and the first and second clamping bases are respectively provided with a avoiding portion and first and second avoiding portions at a bottom intermediate position, the fitting fixing portion and the fixing groove are provided with a fixing hole and a screw hole which penetrate through the avoiding portion and the first and second avoiding portions in a vertical direction, and the fixing base and the first and second clamping bases pass through the fixing hole and the screw hole from the avoiding portion and the first and second avoiding portions through a bolt and are fastened to the fixing member of the back cover.

6. The balance control mechanism according to claim 3, wherein the bottom surfaces of the two rotating bases are fixed to a first folding plate and a second folding plate, respectively, the first folding plate is provided with a first protrusion and a first notch toward the side edge of the second folding plate, and the second folding plate is provided with a second notch receiving the first protrusion and a second protrusion received in the first notch toward the side edge of the first folding plate.

7. The balance control mechanism of claim 6, wherein the two rotating bases are at least partially fixed on the first and second protrusions, respectively, and the top of the base body of the rotating base forms an arc-shaped top surface engaged with the cavity of the back cover.

8. The balance control mechanism of claim 7 wherein the sliding path of the shaft within the arcuate slot of the rotatable base is substantially the same as the folding path of the first and second folding plates.

9. The balance control mechanism according to claim 1, wherein the first and second clamping seats are respectively provided with a limiting hole for limiting two ends of the first shaft at corresponding positions; through holes for the second shaft to pass through or limit are respectively formed in the positions, corresponding to the second shaft, of the first clamping seat and the second clamping seat; the position of the fixed seat corresponding to the through hole is provided with a shaft hole; the horizontal position of the axis of the first gear is higher than that of the second gear, and the radius of the first gear is larger than that of the second gear.

10. The balance control mechanism of claim 9 wherein said first retainer is recessed toward a top of a side of said first gear to form a damping groove, said damping groove having a damping member mounted therein for clamping to said pair of first shaft members.

11. The balance control mechanism according to claim 9, wherein an end surface of the second holder facing the first holder is recessed to form a notch at a position corresponding to the limiting hole of the first shaft, and a clamping block engaged with the notch is sleeved on the first shaft, and the clamping block can be clamped in or removed from the notch under different states.

12. The balance control mechanism of claim 11 wherein said spring is captured between said clamp plate and said cartridge.

13. A folding display device comprising the balance control mechanism of claims 1-12.

14. A communication apparatus comprising the foldable display device according to claim 13.

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