CN214742725U - Double-shaft synchronous hinge - Google Patents

Abstract

A double-shaft synchronous hinge comprises a base unit comprising a base, two rotating shaft units arranged on the base at intervals, two movable frame units respectively pivoted on two sides of the base and two linkage units. 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. The linkage unit is used for enabling the rotating shaft to rotate synchronously. Each linkage unit comprises a linkage seat arranged on the base, a first gear piece rotatably arranged on the linkage seat and two second gear pieces respectively meshed with 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 the corresponding rotating block and a gear part which is connected with the first shaft part and meshed with the first gear piece, and the gear part is a bevel gear head.

Description

Double-shaft synchronous hinge

Technical Field

The utility model relates to a hinge especially relates to a synchronous formula hinge of biax.

Background

In recent years, a flexible screen is widely used for various folding devices, which can be divided into an inward folding structure and an outward folding structure, and when the flexible screen is used for 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/depart 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

An object of the utility model is to provide a can solve the synchronous formula hinge of biax of above-mentioned problem.

The utility model discloses a double-shaft synchronous hinge, which comprises a base unit, a hinge base and a hinge base, wherein the base unit comprises a base extending along the front and back directions; 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 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 linkage units are respectively arranged on the rotating shaft unit and used for enabling the rotating shaft to synchronously rotate, each linkage unit comprises a linkage seat arranged on the 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 the corresponding rotating block and a gear part connected with the first shaft part and meshed with the first gear piece, and the gear part is a bevel gear head; when the two rotating shafts of the rotating shaft unit located at the same side of the base rotate, the corresponding rotating blocks can drive the two corresponding second gear parts to rotate so as to drive the two second gear parts located at the other side of the base, the rotating blocks and the rotating shafts to rotate, so that the rotating shafts can rotate synchronously.

Synchronous formula hinge of biax, still contain two track support units that set up both ends around this base respectively, each track support unit includes the public joint spare of this fly leaf of the correspondence of one of them adjustable shelf unit of rigid coupling, the female fastener and a plurality of setting up the track connecting piece of joint each other between this public joint spare and this female fastener of the corresponding this fly leaf of another adjustable shelf unit wherein, each track connecting piece has the body and from the outside protrusion strip that extends of this body, the sunken accepting groove that forms the protrusion strip movably holding that supplies another track connecting piece of this body.

Synchronous formula hinge of biax, this body of each track connecting piece have the first surface, be opposite to the second surface of this first surface, connect the internal surface of this first surface and this second surface and be located this accepting groove and keep away from this internal surface and with the stop of this second surface flushing, this protrusion strip forms in this first surface, this accepting groove is sunken to be formed in this second surface and this internal surface, this protrusion strip has the fixture block, this fixture block can be stopped in order to prevent this protrusion strip from breaking away from this accepting groove by this stop.

Synchronous formula hinge of biax, each track connection spare still have the roof of connecting this body and connect this roof and with this body looks spaced planking, this planking is controlled ascending width of side from top to bottom and is gradually reduced from top to bottom along this from this about.

Synchronous formula hinge of biax, this public joint spare of each track support unit has the orientation the protruding strip of joint that track connecting piece extends, this joint protruding strip movably holding is in the accepting groove of this track connecting piece of neighbouring this public joint spare, this female joint spare of each track support unit has the joint accepting groove of the protruding strip movably holding that supplies the track connecting piece of neighbouring this female joint spare.

Synchronous formula hinge of biax, this joint protruding strip of this public joint spare reaches track connection's protruding strip all is circular-arcly, this joint accepting groove of this female joint spare reaches track connection's accepting groove corresponds respectively protruding strip and this joint protruding strip all are circular-arcly.

Double-shaft synchronous hinge, this base unit still include two and set up respectively in the spacing mounting at both ends around this base, one of them track connection spare of this track support unit that each spacing mounting rigid coupling corresponds has two and keeps away from the spacing post that this pivot unit extends, and this base plate of each adjustable shelf unit has two and supplies the rotation groove of this spacing post movably holding that corresponds, should rotate the groove and have first end and hold in the second of this first end on the contrary, work as track connection spare is when the primary importance, spacing post is located respectively rotate the first end in groove, work as track connection spare is when removing to the second place by this primary importance, the base plate makes for this base pivot spacing post is located respectively rotate the second end in groove.

The double-shaft synchronous hinge of the present invention, each of the rotating shaft units further comprises two holding seats for allowing the rotating shaft to movably penetrate through, two rotating shaft elastic members with two ends respectively abutting against the holding seats, and two pairs of holding members respectively fixedly sleeved on the rotating shaft and fitted to the holding seats, each of the holding seats has two holding rings correspondingly fitted to the holding members, each of the holding rings has a plurality of first protrusions and first notches defined by the first protrusions, each of the holding members has a plurality of second protrusions and second notches defined by the second protrusions, the holding members can be switched between a first state and a second state along with the rotation of the rotating shaft, and in the first state, the second protrusions of the holding members are received in the first notches of the holding rings, the second notch of the clamping abutting piece correspondingly accommodates the first protrusion of the clamping abutting ring, and when the second state is realized, the second protrusion of the clamping abutting piece abuts against the first protrusion of the clamping abutting ring, so that the rotating shaft elastic piece is compressed.

Synchronous formula hinge of biax, each pivot including wear to locate the first section of wearing to establish of this turning block that corresponds fixedly, connect this first section of wearing to establish and block and support in the block dish section of this turning block and connect this block dish section and supply the seat is supported to the card pivot elastic component reaches the second that the piece cover was established is worn to establish the section.

Synchronous formula hinge of biax, the lateral margin of the turning block of each activity frame unit is sunken to form the locking groove, each activity frame unit still includes two and sets up respectively in this fly leaf and butt the blocked mechanical system of turning block, each blocked mechanical system have shell, movably set up in this shell and the locking of this shell of butt this turning block lateral margin and this locking elastic component of both ends difference butt respectively, work as when track connection spare is in the primary importance, this turning block lateral margin of this locking butt and this locking elastic component are compressed, work as when track connection spare removes to the second place, this locking is pushed away by the elastic force of this locking elastic component and is supported and get into this locking groove.

The beneficial effects of the utility model reside in that: by means of the linkage unit, when the two rotating shafts of the rotating shaft unit, which are positioned at the same side of the base, rotate, the corresponding rotating blocks can drive the two corresponding second gear parts to rotate so as to drive the two second gear parts, the rotating blocks and the rotating shafts, which are positioned at the other side of the base, to rotate, so that the rotating shafts can rotate synchronously. And the first gear piece and the second gear piece are meshed with each other in the direction of the bevel gear head to achieve the effect of linkage, compared with the existing mode that the spur gears are meshed with each other, the bevel gear head occupies a smaller volume, the required installation space can be saved, and the effect of linkage can be achieved.

Drawings

Fig. 1 is a perspective view of an embodiment of the dual-axis synchronous hinge of the present invention, the dual-axis synchronous hinge is 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 the embodiment in a fragmentary exploded perspective view;

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 with reference to the accompanying drawings and examples.

Referring to fig. 1 to 3, an embodiment of the dual-axis synchronous hinge 10 of the present invention is suitable for being disposed between two bodies (not shown) to commonly provide a flexible screen (not shown) for setting, thereby forming 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 a front-rear direction D1 to form an elongated plate, and two fixing members 12 respectively disposed at front and rear 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 and provided 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. A plurality of second protrusions 251 and second recesses 252 defined by the second protrusions 251 are formed on a surface of each abutting member 25 facing 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 base 31 disposed on the base 11, a first gear member 32 rotatably disposed on the linkage base 31 along a left-right direction D2 perpendicular to the front-back direction D1, two second gear members 33 respectively engaging with two ends of the first gear member 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 units 4 are 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 receiving the corresponding limiting posts 121, and the rotating slots 411 have a first end 411a and a second end 411b opposite to the first end 411 a. 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 532 a. 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 511 a. 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 double-shaft synchronous hinge 10 is correspondingly located in an outward-folded state, the protruding bar 532 of each track connecting member 53 is completely received in the receiving groove 531d of the other track connecting member 53, the engagement projection strips 511 of the male coupling member 51 are completely received in the corresponding receiving grooves 531d of the rail coupling member 53, wherein the protrusion bar 532 of one rail coupler 53 is completely received in the coupling receiving groove 521 of the female coupling member 52, so that the rail connecting members 53 are close to each other and the male engaging member 51 and the female engaging member 52 both extend in an up-down direction D3 perpendicular to the front-back direction D1 and the left-right direction D2, the movable plate 43 also extends in the up-down direction D3 and is adjacent to the rotating shaft 22, when the locking member 442 abuts against the side edge of the rotating block 42 and the locking elastic member 443 is compressed, the position-limiting posts 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 located in a flattened state, the protruding bar 532 of each rail connecting member 53 and the engaging protruding bar 511 of the male connecting member 51 are partially received in the receiving groove 531D of the other rail connecting member 53, one of the protruding bars 532 is partially received in the engaging receiving groove 521 of the female connecting member 52, and the latch 532a and the engaging latch 511a are engaged with the stop block 531e, wherein one of the latches 532a is engaged with the engaging stop block 522, so as to move the rail connecting members 53 away from each other, i.e. extend a distance from each other, and the male connecting member 51 and the female connecting member 52 both extend along 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 groove 411, and the locking member 442 is pushed by the elastic force of the locking elastic member 443 to enter the locking groove 421, providing a locking hand feeling, so that the dual-axis synchronous hinge 10 is easily kept in the flat state for a user to use and operate the flexible screen (not shown). 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 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.

To sum up, the utility model discloses two-axis synchronous formula hinge 10 borrow by track support unit 5 track connecting piece 53 can be when rotating between this first position and this second position, protruding strip 532's fixture block 532a can by stopper 531e stops in order to prevent protruding strip 532 certainly the accepting groove 531d breaks away from, and because public engaging member 51 reaches female engaging member 52 rigid coupling fly leaf 43, protruding strip 532 can not certainly accepting groove 531d breaks away from and can prevent in step fly leaf 43 continuously keeps away from pivot 22 and probably with the turning block 42 separation, so can reach the purpose of the utility model.

However, the above description is only an example of the present invention, and the scope of the present invention should not be limited thereto, and all the simple equivalent changes and modifications made according to the claims and the contents of the specification should be included in the scope of the present invention.

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 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 linkage units respectively arranged on the rotating shaft unit for enabling the rotating shaft to synchronously rotate, wherein each linkage unit comprises a linkage seat arranged on the base, a first gear piece extending along the left-right direction and rotatably arranged on the linkage seat, and two second gear pieces respectively meshed with two ends of the first gear piece, 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 the corresponding rotating block and a gear part connected with the first shaft part and meshed with the first gear piece, and the gear part is a bevel gear head;

when the two rotating shafts of the rotating shaft unit located at the same side of the base rotate, the corresponding rotating blocks can drive the two corresponding second gear parts to rotate so as to drive the two second gear parts located at the other side of the base, the rotating blocks and the rotating shafts to rotate, so that the rotating shafts can rotate synchronously.

2. The double-shaft synchronous hinge according to claim 1, wherein: the double-shaft synchronous hinge further comprises two rail support units which are respectively arranged at the front end and the rear end of the base, each rail support unit comprises a male joint piece fixedly connected with the corresponding movable plate of one of the movable frame units, a female joint piece fixedly connected with the corresponding movable plate of the other of the movable frame units and a plurality of rail connecting pieces which are arranged between the male joint piece and the female joint piece and are mutually clamped, each rail connecting piece is provided with a body and a protruding strip which extends outwards from the body, and the body is sunken to form an accommodating groove for movably accommodating the protruding strip of the other rail connecting piece.

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

4. The double-shaft synchronous hinge according to claim 3, 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.

5. The double-shaft synchronous hinge according to claim 3, 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.

6. The double-shaft synchronous hinge according to claim 5, 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.

7. The double-shaft synchronous hinge according to claim 2, 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 from the first positions to the second 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.

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 of each clamping and abutting piece facing the clamping and abutting pieces, a plurality of second bulges and second notches which are defined by the second bulges are formed on the surface of each clamping and abutting piece facing the clamping and abutting pieces, the clamping and abutting pieces can be changed between a first state and a second state along with the rotation of the rotating shaft, when in the first state, the second bulges of the clamping and abutting pieces are accommodated in the first notches of the clamping and abutting pieces, and the second notches of the clamping and abutting pieces are correspondingly accommodated in the first bulges of the clamping and abutting pieces, in the second state, the second protrusion of the clamping and abutting piece abuts against the first protrusion of the clamping and abutting ring, so that the rotating shaft elastic piece is compressed.

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 2, 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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