CN115355239A - Double-shaft synchronous hinge - Google Patents

Abstract

The utility model provides a synchronous formula hinge of biax, contains the base unit that includes the base, sets up in the pivot unit of this base, two interlock units, two respectively the pivot locate the adjustable shelf units of the both sides of base and two set up the track support units at the front and back both ends of base respectively with two intervals. Each rotating shaft unit comprises an accommodating seat arranged on the base and two rotating shafts rotatably arranged on the accommodating seat. Each movable frame unit comprises a base plate pivoted on the base unit, two rotating blocks fixedly sleeved on the corresponding two rotating shafts and two movable plates capable of moving relative to the rotating blocks. Each track support unit comprises a male joint part, a female joint part and a plurality of track connecting parts arranged between the male joint part and the female joint part. Each track connector has a body and a protruding strip extending outwardly from the body. The body is sunken to form an accommodating groove and a stop block positioned in the accommodating groove, the protruding strip is provided with a clamping block, and the clamping block can be stopped by the stop block to prevent the protruding strip from being separated from the accommodating groove.

Description

Double-shaft synchronous hinge

Technical Field

The invention relates to a hinge, in particular to a double-shaft synchronous hinge.

Background

In recent years, a flexible screen is widely used in various folding devices, which can be divided into an inward folding structure and an outward folding structure, and when the flexible screen is used in a folding device belonging to the outward folding structure, a conventional hinge has a base, two rotating shafts, two rotating blocks pivoting with respect to the base as the rotating shafts rotate, and a movable plate movable with respect to the rotating blocks to approach/separate from the base. However, during the rotation of the rotating shaft, the movable plate may be too far away from the base to be separated from the rotating block due to improper operation of the user, which may cause structural damage.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide a double-shaft synchronous hinge.

The biaxial synchronous hinge of the present invention comprises a base unit including a base extending in a front-rear direction; two rotating shaft units which are arranged on the base at intervals along the front-back direction, wherein each rotating shaft unit comprises an accommodating seat arranged on the base and two rotating shafts which are rotatably arranged on the accommodating seat; two linkage units respectively arranged on the rotating shaft unit for enabling the rotating shaft to synchronously rotate; two movable frame units which are respectively pivoted on two sides of the base along the left-right direction vertical to the front-back direction, each movable frame unit comprises a base plate pivoted on the base unit, two rotating blocks fixedly sleeved on the two corresponding rotating shafts and two movable plates capable of moving relative to the rotating blocks; the two rail bracket units are respectively arranged at the front end and the rear end of the base, each rail bracket unit comprises a male joint piece fixedly connected with the corresponding movable plate of one movable frame unit, a female joint piece fixedly connected with the corresponding movable plate of the other movable frame unit and a plurality of rail joint pieces arranged between the male joint piece and the female joint piece and mutually clamped, each rail joint piece is provided with a body and a convex strip extending outwards from the body, the body is sunken to form an accommodating groove for movably accommodating the convex strip of the other rail joint piece and a stop block positioned in the accommodating groove, the convex strip is provided with a clamping block, and the clamping block can be stopped by the stop block to prevent the convex strip from separating from the accommodating groove; the rail connecting pieces can rotate between a first position and a second position, the protruding strip of each rail connecting piece is completely accommodated in the accommodating groove of the other rail connecting piece in the first position, so that the rail connecting pieces are close to each other, the male connecting piece and the female connecting piece extend along the vertical direction perpendicular to the front-back direction and the left-right direction, the movable plate also extends in the vertical direction and is adjacent to the rotating shaft, and in the second position, the protruding strip of each rail connecting piece is partially accommodated in the accommodating groove of the other rail connecting piece, the clamping block is clamped on the stopping block, so that the rail connecting pieces are far away from each other, the male connecting piece and the female connecting piece extend along the left-right direction, and the corresponding movable plate is driven to move away from the rotating shaft relative to the rotating block.

The body of each track connecting piece is provided with a first surface, a second surface opposite to the first surface and an inner surface connecting the first surface and the second surface, the protruding strip is formed on the first surface, the accommodating groove is formed on the second surface and the inner surface, and the stop block is far away from the inner surface and is flush with the second surface.

In the biaxial synchronous hinge, each track connecting piece is also provided with a top plate connected with the body and an outer plate connected with the top plate and spaced from the body, and the width of the outer plate in the left-right direction is gradually reduced from top to bottom along the up-down direction.

The male joint member of each track support unit is provided with a joint protruding strip extending towards the track connecting member, the joint protruding strip is movably accommodated in the accommodating groove of the track connecting member adjacent to the male joint member, and the female joint member of each track support unit is provided with a joint accommodating groove for movably accommodating the protruding strip of the track connecting member adjacent to the female joint member.

In the double-shaft synchronous hinge of the present invention, the engaging protrusion of the male engaging member and the protrusion of the rail connecting member are both arc-shaped, and the engaging receiving groove of the female engaging member and the receiving groove of the rail connecting member are both arc-shaped corresponding to the protrusion and the engaging protrusion, respectively.

The base unit also comprises two limit fixing pieces which are respectively arranged at the front end and the rear end of the base, each limit fixing piece is fixedly connected with one of the track connecting pieces of the corresponding track support unit and is provided with two limit columns which extend away from the rotating shaft unit, the base plate of each movable frame unit is provided with a rotating groove which is used for movably accommodating the corresponding limit column, the rotating groove is provided with a first end and a second end opposite to the first end, when the track connecting pieces are at the first position, the limit columns are respectively positioned at the first end of the rotating groove, and when the track connecting pieces move from the first position to the second position, the base plate pivots relative to the base so that the limit columns are respectively positioned at the second end of the rotating groove.

The invention relates to a double-shaft synchronous hinge, wherein each linkage unit comprises a linkage seat arranged on a base, a first gear piece and two second gear pieces, the first gear piece extends along the left-right direction and is rotatably arranged on the linkage seat, the two second gear pieces are respectively meshed with the two ends of the first gear piece, the two ends of the first gear piece are respectively provided with a bevel gear head, each second gear piece is provided with a first shaft part for fixedly sleeving a corresponding rotating block and a gear part which is connected with the first shaft part and is meshed with the first gear piece, and the gear part is a bevel gear head.

The double-shaft synchronous hinge comprises a rotating shaft unit, a rotating shaft unit and two rotating shaft units, wherein the rotating shaft unit comprises two clamping and abutting seats, two rotating shaft elastic pieces and two pairs of clamping and abutting pieces, the two clamping and abutting pieces are spaced from each other and used for allowing the rotating shaft to movably penetrate through, the two ends of the rotating shaft elastic pieces are abutted against the clamping and abutting seats respectively, the two pairs of clamping and abutting pieces are fixedly sleeved on the rotating shaft respectively and are matched with the clamping and abutting seats, each clamping and abutting seat is provided with two clamping and abutting rings correspondingly matched with the clamping and abutting pieces, a plurality of first bulges and first notches which are defined by the first bulges are formed on the surface, facing the clamping and abutting pieces, of each clamping and abutting piece, a plurality of second bulges and second notches which are defined by the second bulges are formed on the surface, facing the clamping and abutting pieces, of each clamping and abutting piece, the first bulges and the first notches of the clamping and the second bulges of the clamping and the second clamping and abutting pieces can be changed between a first state and a second state along with the rotating shaft.

Each rotating shaft comprises a first penetrating section fixedly penetrating the corresponding rotating block, a stopping disc section connected with the first penetrating section and clamped against the rotating block, and a second penetrating section connected with the stopping disc section and sleeved with the clamping seat, the rotating shaft elastic piece and the clamping piece.

The double-shaft synchronous hinge comprises a movable frame unit, a movable plate unit and a locking mechanism, wherein the side edge of a rotating block of each movable frame unit is sunken to form a locking groove, each movable frame unit also comprises two locking mechanisms which are respectively arranged on the movable plate and are abutted against the rotating block, each locking mechanism comprises a shell, a locking member which is movably arranged on the shell and is abutted against the side edge of the rotating block, and a locking elastic member of which two ends are respectively abutted against the shell and the locking member, when a track connecting member is at a first position, the locking member is abutted against the side edge of the rotating block, the locking elastic member is compressed, and when the track connecting member moves to a second position, the locking member is pushed by the elastic force of the locking elastic member to enter the locking groove.

The invention has the beneficial effects that: when the track connecting piece of the track support unit can rotate between the first position and the second position, the clamping block of the protruding strip can be blocked by the blocking block to prevent the protruding strip from separating from the accommodating groove, and once the protruding strip cannot separate from the accommodating groove, the male connecting piece and the female connecting piece are fixedly connected with the movable plate, the movable plate can be synchronously prevented from continuously leaving away from the rotating shaft and possibly separating from the rotating block.

Drawings

FIG. 1 is a perspective view of one embodiment of the dual-axis synchronous hinge of the present invention in a flattened state;

FIG. 2 is a perspective view of the embodiment, the two-axis synchronous hinge being in a folded-out state;

FIG. 3 is a fragmentary exploded perspective view of the embodiment;

FIG. 4 is another perspective of a fragmentary exploded perspective view of the embodiment;

FIG. 5 is a fragmentary top plan view of the embodiment;

fig. 6 is a partial perspective view of the rail housing unit of this embodiment, with two rail connectors omitted;

FIG. 7 is a partial top view of the track support unit of this embodiment with two track links omitted;

FIG. 8 is a partial rear view of the track support unit of this embodiment with two track links omitted;

FIG. 9 is a cross-sectional view taken along section line IX-IX of FIG. 5, illustrating the track attachment in a second position;

FIG. 10 is a cross-sectional view taken along section line X-X of FIG. 5, illustrating the track connector in the second position;

FIG. 11 is a cross-sectional view similar to FIG. 9, illustrating the track connector in a first position; and

fig. 12 is a cross-sectional view similar to fig. 10, illustrating the track connector in the first position.

Detailed Description

The present invention will be described in detail below with reference to the drawings and examples.

Referring to fig. 1 to 3, an embodiment of a dual-axis synchronous hinge 10 according to the present invention is suitable for being disposed between two bodies (not shown) to be commonly disposed on a flexible screen (not shown) to form an external foldable electronic device (not shown). It should be noted that, in the present embodiment, the flexible screen is fixedly disposed on the two bodies and located on the upward surface in fig. 1, and the dual-axis synchronous hinge 10 only provides the flexible screen support and is not fixedly disposed, but not limited thereto. The dual-axis synchronous hinge 10 includes a base unit 1, two rotating shaft units 2, two linking units 3, two movable frame units 4, and two rail support units 5.

The base unit 1 includes a base 11 extending along the front-back direction D1 to form a slender plate, and two limiting fixing members 12 respectively disposed at the front and back ends of the base 11. Each of the limiting fixing members 12 has two limiting posts 121 extending away from the rotating shaft unit 2 and a fixing convex post 122 protruding upward, and the functions of the two posts are described later.

Referring to fig. 1, fig. 3 and fig. 4, the rotating shaft units 2 are disposed on the base 11 at intervals along the front-back direction D1, each rotating shaft unit 2 includes a receiving seat 21 disposed on the base 11, two rotating shafts 22 rotatably disposed on the receiving seat 21, two abutting seats 23 spaced from each other for the rotating shafts 22 to movably penetrate, two rotating shaft elastic members 24 having two ends abutting against the abutting seats 23, two pairs of abutting members 25 respectively fixedly sleeved on the rotating shafts 22 and fitting the abutting seats 23, and two stopping pads 26 respectively fixedly sleeved on the ends of the rotating shafts 22 and abutting against one pair of the abutting members 25. Each of the rotating shafts 22 includes a first penetrating section 221 fixedly penetrating through the corresponding movable frame unit 4, a stopping disc section 222 connected to the first penetrating section 221 and clamped against the movable frame unit 4, and a second penetrating section 223 connected to the stopping disc section 222 for the clamping seat 23, the rotating shaft elastic member 24, and the clamping member 25 to be sleeved thereon. Each abutting seat 23 has two abutting rings 231 correspondingly matching with the abutting member 25, and a plurality of first protrusions 232 and first recesses 233 defined by the first protrusions 232 are formed on the surface of each abutting ring 231 facing the abutting member 25. Each of the abutting members 25 has a plurality of second protrusions 251 and second recesses 252 defined by the second protrusions 251 on the surface of the abutting ring 231. The abutting member 25 can be changed between a first state and a second state along with the rotation of the rotating shaft 22, in the first state, the second protrusion 251 of the abutting member 25 is received in the first notch 233 of the abutting ring 231, the second notch 252 of the abutting member 25 is correspondingly received in the first protrusion 232 of the abutting ring 231, and in the second state, the second protrusion 251 of the abutting member 25 abuts against the first protrusion 232 of the abutting ring 231 to compress the rotating shaft elastic member 24, thereby providing a torsion force for the rotation of the rotating shaft unit 2 and the movable frame unit 4 relative to the base unit 1, but the manner of generating the torsion force is not limited to this form. The stop washer 26 is used to prevent the rotation shaft 22 from shifting in the axial direction thereof.

Referring to fig. 3 to 5, the linkage units 3 are respectively disposed on the rotating shaft units 2 for synchronously rotating the rotating shafts 22. Each linkage unit 3 includes a linkage seat 31 disposed on the base 11, a first gear 32 rotatably disposed on the linkage seat 31 along a left-right direction D2 perpendicular to the front-back direction D1, two second gear 33 engaging with two ends of the first gear 32, and a positioning pad 34. The two ends of the first gear member 32 are bevel gears, and each second gear member 33 has a first shaft portion 331, a gear portion 332 connected to the first shaft portion 331 and engaged with the first gear member 32, and a second shaft portion 333 connected to the gear portion 332 and extending away from the first shaft portion 331. The gear portion 332 is a bevel gear head. The positioning pad 34 is fixedly sleeved on the second shaft portion 333 and abuts against the linking seat 31 to prevent the second gear member 33 from shifting in the axial direction. When one of the second gear members 33 rotates, the gear portion 332 of the second gear member 33 drives the first gear member 32 to rotate, and further drives the gear portion 332 of the other second gear member 33 to rotate, thereby achieving the linking effect. The interlocking unit 3 achieves the interlocking effect by the first gear member 32 and the second gear member 33 being engaged with each other in the direction of the bevel gear head, and compared with the conventional manner in which spur gears are engaged with each other, the volume occupied by the bevel gear head is smaller, the required installation space can be saved, and the interlocking effect can be achieved as well.

Referring to fig. 3 to 5, the movable frame unit 4 is respectively pivoted to two sides of the base 11 along the left-right direction D2. Each movable frame unit 4 includes a base plate 41 pivoted to the base unit 1 and fixedly connected to the machine body (not shown), two rotating blocks 42 fixedly sleeved on the first penetrating sections 221 of the two corresponding rotating shafts 22 and the first shaft portions 331 of the two corresponding second gear members 33, two movable plates 43 capable of moving relative to the rotating blocks 42 and fixedly connected to the machine body (not shown), and two locking mechanisms 44 respectively disposed on the movable plates 43 and abutting against the rotating blocks 42. Each substrate 41 has two rotating slots 411 for movably accommodating the corresponding position-limiting posts 121, and the rotating slots 411 have a first end 411a and a second end 411b opposite to the first end 411a. The rotating block 42 is fixed and sleeved on the rotating shaft 22 and the second gear 33 at the same time, so that when one of the rotating shafts 22 rotates, the other rotating shaft 22 can be synchronously driven to rotate through the linkage unit 3. The side edge of each rotating block 42 is recessed to form a locking groove 421. Each locking mechanism 44 has a housing 441, a locking member 442 movably disposed on the housing 441 and abutting against a side edge of the rotating block 42, and a locking elastic member 443 having two ends abutting against the housing 441 and the locking member 442, respectively.

Referring to fig. 3, 6 to 8, the rail bracket units 5 are respectively disposed at the front and rear ends of the base 11, each rail bracket unit 5 includes a male coupling member 51 fixedly connected to the corresponding movable plate 43 of one of the movable frame units 4, a female coupling member 52 fixedly connected to the corresponding movable plate 43 of the other movable frame unit 4, and three rail coupling members 53 disposed between the male coupling member 51 and the female coupling member 52 and engaged with each other. Each track connector 53 has a body 531, a protrusion 532 extending outwardly from the body 531, a top plate 533 connected to the body 531, and an outer plate 534 connected to the top plate 533 and spaced apart from the body 531. The body 531 has a first surface 531a, a second surface 531b opposite to the first surface 531a, an inner surface 531c connecting the first surface 531a and the second surface 531b, a receiving groove 531d recessed from the second surface 531b and the inner surface 531c, and a stop 531e located in the receiving groove 531d away from the inner surface 531c and flush with the second surface 531 b. The protrusion bar 532 is formed on the first surface 531a and has a latch 532a. The top plate 533 is formed with a through hole 533a capable of engaging with the corresponding fixing boss 122 of the position-limiting fixing member 12, and in the embodiment, the fixing boss 122 passes through the through hole 533a of the middle rail connecting member 53, but not limited thereto. The width of the outer panel 534 in the left-right direction D2 decreases from top to bottom along a vertical direction D3 perpendicular to the front-back direction D1 and the left-right direction D2. The male coupling member 51 has an engaging protrusion strip 511 extending toward the track coupling member 53, and the engaging protrusion strip 511 is movably received in the receiving groove 531d of the track coupling member 53 adjacent to the male coupling member 51 and has an engaging protrusion block 511a. The female coupling member 52 has a coupling receiving groove 521 for movably receiving the protrusion 532 of the rail coupler 53 adjacent to the female coupling member 52 and a coupling stopper 522 located in the coupling receiving groove 521. The number of the rail connecting members 53 is not limited to three in the present embodiment, and the size of the rail connecting members can be adjusted according to the number as long as the number is plural and odd.

Referring to fig. 1 and 2, each track link 53 is rotatable between a first position and a second position. Referring to fig. 11 and 12, in the first position, the dual-axis synchronous hinge 10 is correspondingly located in an outward-folded state, the protrusion 532 of each track link 53 is completely received in the receiving slot 531D of the other track link 53, the engaging protrusion 511 of the male engaging element 51 is completely received in the receiving slot 531D of the corresponding track link 53, the protrusion 532 of one track link 53 is completely received in the engaging receiving slot 521 of the female engaging element 52, so that the track links 53 are closed together, the male engaging element 51 and the female engaging element 52 both extend along a vertical direction D3 perpendicular to the front-back direction D1 and the left-right direction D2, the movable plate 43 also extends in the vertical direction D3 and is adjacent to the rotating shaft 22, at this time, the locking element 442 abuts against the side edge of the rotating block 42 and the locking elastic element is compressed, and the position-limiting columns 121 are respectively located at the first ends 411a of the rotating slots 411. Referring to fig. 9 and 10, in the second position, the dual-axis synchronous hinge 10 is in a flattened state, the protrusion strip 532 of each rail connector 53 and the engaging protrusion strip 511 of the male connector 51 are partially received in the receiving slot 531D of the other rail connector 53, one protrusion strip 532 is partially received in the engaging receiving slot 521 of the female connector 52, and the latch 532a and the engaging latch 511a are engaged with the stopper 531e, wherein a latch 532a is engaged with the engaging stopper 522, so that the rail connectors 53 are away from each other, i.e., extend out a distance from each other, and the male connector 51 and the female connector 52 both extend in the left-right direction D2 and respectively drive the corresponding movable plate 43 to move relative to the rotating block 42 away from the rotating shaft 22, at this time, the base plate 41 pivots relative to the base 11 so that the position-limiting posts 121 are respectively located at the second end 411b of the rotating slot 411, and the movable plate 43 is pushed into the locking slot by the elastic force of the locking elastic element 443, so as to provide a hand feeling of locking the dual-axis synchronous hinge 421, which is easy for the user to operate the screen 10 (not shown in the flattened state). It should be noted that, in the present embodiment, the engaging protrusion strip 511 of the male engaging element 51 and the protrusion strip 532 of the track connecting element 53 are both arc-shaped, and the engaging receiving groove 521 of the female engaging element 52 and the receiving groove 531d of the track connecting element 53 are both arc-shaped corresponding to the protrusion strip 532 and the engaging protrusion strip 511, respectively, but the present invention is not limited thereto. Such a design allows for space savings while increasing the distance the track links 53 are pulled apart from each other when in the second position.

In summary, in the dual-shaft synchronous hinge 10 of the present invention, when the rail connecting member 53 of the rail bracket unit 5 is rotatable between the first position and the second position, the latch 532a of the protruding bar 532 can be stopped by the stopper 531e to prevent the protruding bar 532 from being separated from the receiving groove 531d, and since the male engaging member 51 and the female engaging member 52 are fixedly connected to the movable plate 43, once the protruding bar 532 is not separated from the receiving groove 531d, the movable plate 43 can be synchronously prevented from continuously moving away from the rotating shaft 22 and possibly being separated from the rotating block 42, so that the object of the present invention can be achieved.

It should be understood that the above description is only exemplary of the present invention, and that the scope of the present invention should not be limited thereby, and that the invention is intended to cover all modifications and equivalents of the claims and their equivalents.

Claims (10)

1. A dual-axis synchronous hinge, comprising:

a base unit including a base extending in a front-rear direction;

two rotating shaft units which are arranged on the base at intervals along the front-back direction, wherein each rotating shaft unit comprises an accommodating seat arranged on the base and two rotating shafts which are rotatably arranged on the accommodating seat;

two linkage units respectively arranged on the rotating shaft unit for enabling the rotating shaft to synchronously rotate;

two movable frame units which are respectively pivoted on two sides of the base along the left-right direction vertical to the front-back direction, each movable frame unit comprises a base plate pivoted on the base unit, two rotating blocks fixedly sleeved on the two corresponding rotating shafts and two movable plates capable of moving relative to the rotating blocks; and

two rail bracket units respectively arranged at the front end and the rear end of the base, each rail bracket unit comprises a male joint piece fixedly connected with the corresponding movable plate of one movable frame unit, a female joint piece fixedly connected with the corresponding movable plate of the other movable frame unit, and a plurality of rail joint pieces arranged between the male joint piece and the female joint piece and mutually clamped, each rail joint piece is provided with a body and a convex strip extending outwards from the body, the body is sunken to form an accommodating groove for movably accommodating the convex strip of the other rail joint piece and a stop block positioned in the accommodating groove, the convex strip is provided with a clamping block, and the clamping block can be stopped by the stop block to prevent the convex strip from separating from the accommodating groove;

the rail connecting pieces can rotate between a first position and a second position, the protruding strip of each rail connecting piece is completely accommodated in the accommodating groove of the other rail connecting piece in the first position, so that the rail connecting pieces are close to each other, the male connecting piece and the female connecting piece extend along the vertical direction perpendicular to the front-back direction and the left-right direction, the movable plate also extends in the vertical direction and is adjacent to the rotating shaft, and in the second position, the protruding strip of each rail connecting piece is partially accommodated in the accommodating groove of the other rail connecting piece, the clamping block is clamped on the stopping block, so that the rail connecting pieces are far away from each other, the male connecting piece and the female connecting piece extend along the left-right direction, and the corresponding movable plate is driven to move away from the rotating shaft relative to the rotating block.

2. The double-shaft synchronous hinge according to claim 1, wherein: the body of each track connecting piece is provided with a first surface, a second surface opposite to the first surface and an inner surface connecting the first surface and the second surface, the protruding strip is formed on the first surface, the accommodating groove is formed on the second surface and the inner surface, and the stop block is far away from the inner surface and is flush with the second surface.

3. The double-shaft synchronous hinge according to claim 2, wherein: each track connecting piece is also provided with a top plate connected with the body and an outer plate connected with the top plate and spaced from the body, and the width of the outer plate in the left-right direction is gradually reduced from top to bottom along the up-down direction.

4. The double-shaft synchronous hinge according to claim 2, wherein: the male joint member of each track support unit is provided with a joint protruding strip extending towards the track connecting member, the joint protruding strip is movably accommodated in the accommodating groove of the track connecting member adjacent to the male joint member, and the female joint member of each track support unit is provided with a joint accommodating groove for movably accommodating the protruding strip of the track connecting member adjacent to the female joint member.

5. The double-shaft synchronous hinge according to claim 4, wherein: the joint protruding strip of the male joint piece and the protruding strip of the track connecting piece are both arc-shaped, and the joint accommodating groove of the female joint piece and the accommodating groove of the track connecting piece respectively correspond to the protruding strip and the joint protruding strip which are both arc-shaped.

6. The double-shaft synchronous hinge according to claim 1, wherein: the base unit further comprises two limiting fixing pieces which are arranged at the front end and the rear end of the base respectively, each limiting fixing piece is fixedly connected with one of the corresponding track connecting pieces of the track support unit and is provided with two limiting columns which are far away from the extension of the rotating shaft unit, the base plate of each movable frame unit is provided with two rotating grooves for movably accommodating the corresponding limiting columns, each rotating groove is provided with a first end and a second end opposite to the first end, when the track connecting pieces are at the first positions, the limiting columns are located at the first ends of the rotating grooves respectively, and when the track connecting pieces move to the second positions from the first positions, the base plate pivots relative to the base so that the limiting columns are located at the second ends of the rotating grooves respectively.

7. The double-shaft synchronous hinge according to claim 1, wherein: each linkage unit comprises a linkage seat arranged on the base, a first gear piece which is rotatably arranged on the linkage seat along the left-right direction in an extending mode, and two second gear pieces which are respectively meshed with two ends of the first gear piece, bevel gear heads are respectively arranged at two ends of the first gear piece, each second gear piece is provided with a first shaft portion and a gear portion, the first shaft portion is fixedly sleeved with the corresponding rotating block, the gear portion is connected with the first shaft portion and meshed with the first gear piece, and the gear portion is a bevel gear head.

8. The double-shaft synchronous hinge according to claim 1, wherein: each rotating shaft unit further comprises two clamping and abutting seats which are spaced from each other and allow the rotating shaft to movably penetrate, two rotating shaft elastic pieces of which two ends are abutted against the clamping and abutting seats respectively, and two pairs of clamping and abutting pieces which are fixedly sleeved on the rotating shaft respectively and are matched with the clamping and abutting seats respectively, each clamping and abutting seat is provided with two clamping and abutting rings which are correspondingly matched with the clamping and abutting pieces, a plurality of first bulges and first notches which are defined by the first bulges are formed on the surface, facing the clamping and abutting pieces, of each clamping and abutting piece, a plurality of second bulges and second notches which are defined by the second bulges are formed on the surface, facing the clamping and abutting pieces, of each clamping and abutting piece, can change between a first state and a second state along with the rotation of the rotating shaft, when the first state is adopted, the second bulges of the clamping and abutting pieces are accommodated in the first notches of the clamping and abutting pieces, and the second bulges of the clamping and abutting pieces are correspondingly accommodated in the first bulges of the clamping and abutting pieces, and the rotating shaft is compressed when the second state is adopted.

9. The double-shaft synchronous hinge according to claim 8, wherein: each rotating shaft comprises a first penetrating section fixedly penetrating through the corresponding rotating block, a blocking disc section connected with the first penetrating section and clamped against the rotating block, and a second penetrating section connected with the blocking disc section and sleeved with the clamping seat, the rotating shaft elastic piece and the clamping piece.

10. The double-shaft synchronous hinge according to claim 1, wherein: the lateral margin of the rotating block of each movable frame unit is sunken to form a locking groove, each movable frame unit also comprises two locking mechanisms which are respectively arranged on the movable plate and are abutted against the rotating block, each locking mechanism is provided with a shell, a locking member which is movably arranged on the shell and is abutted against the lateral margin of the rotating block and a locking elastic member of which two ends are respectively abutted against the shell and the locking member, when the track connecting member is at the first position, the locking member is abutted against the lateral margin of the rotating block and the locking elastic member is compressed, and when the track connecting member moves to the second position, the locking member is pushed by the elastic force of the locking elastic member to enter the locking groove.

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