CN112306149B

CN112306149B - Folding device for flexible screen and mobile terminal

Info

Publication number: CN112306149B
Application number: CN201910713014.0A
Authority: CN
Inventors: 谢卫; 周虎; 蒋琼艳; 汤海舰
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2023-07-14
Anticipated expiration: 2039-08-02
Also published as: CN112306149A

Abstract

The present disclosure relates to a folding device for a flexible screen and a mobile terminal, the folding device including a first carrier, a second carrier, and a slip connection mechanism connected between the first carrier and the second carrier. The first carrier and the second carrier are used for jointly carrying the flexible screen. The slip connection mechanism comprises a support protection mechanism and two multi-stage slip mechanisms. The two multi-stage sliding mechanisms are arranged on two sides of the supporting protection mechanism and are in one-to-one correspondence connection with the first bearing piece and the second bearing piece, and the multi-stage sliding mechanisms are in sliding connection with the supporting protection mechanism. In the folding or unfolding process, the first bearing piece and the second bearing piece rotate around the supporting protection mechanism through the corresponding multi-stage sliding mechanism respectively. And in the folding process, the two attaching areas of the flexible screen attach and the deformation area between the two attaching areas deforms. And the deformation zone can be accommodated in an accommodating space formed by the multistage sliding mechanism and the supporting and protecting mechanism, so that the flexible screen can be protected.

Description

Folding device for flexible screen and mobile terminal

Technical Field

The disclosure relates to the technical field of electronic equipment, in particular to a folding device for a flexible screen and a mobile terminal.

Background

With the development of electronic device technology, users have a higher demand for electronic devices having a large size and being easy to carry, and thus, electronic devices having a folding flexible screen have been attracting a great deal of attention. When assembled with a housing of an electronic device, the folding deformation area of the flexible screen is not usually fixedly connected with the housing in order to ensure that the flexible screen can be switched between a folded state and an unfolded state. When the folding flexible screen is folded, two possible movement states of outwards protruding folding and inwards concavely folding can occur in the folding deformation area.

For a folding flexible screen folded inwards (namely, two display surfaces of the flexible screen can be folded relatively and are contained between folding shells), due to the limitation of materials, the deformation area of the flexible screen can deform slightly to protrude out of the plane of the flexible screen when the flexible screen is folded, so that the flexible screen is easy to be extruded and even damaged by the shell of the electronic equipment.

Disclosure of Invention

The purpose of the present disclosure is to provide a folding device for a flexible screen, which can avoid the flexible screen from being damaged in the folding process.

In order to achieve the above-mentioned purpose, the present disclosure provides a folding device for a flexible screen, it includes a first carrier, a second carrier and a slip connection mechanism connected between the first carrier and the second carrier, the first carrier and the second carrier are used for jointly bearing the flexible screen, the slip connection mechanism includes a support protection mechanism and two multistage slip mechanisms, two multistage slip mechanisms are disposed at two sides of the support protection mechanism and are connected with the first carrier and the second carrier in a one-to-one correspondence manner, the multistage slip mechanisms are connected with the support protection mechanism in a slip manner, in the folding or unfolding process, the first carrier and the second carrier rotate around the support protection mechanism through the corresponding multistage slip mechanisms, and in the folding process, the first carrier and the second carrier are close to each other so that two attaching regions of the flexible screen and a deformation region located between the two attaching regions are deformed, and the deformation region can be accommodated in the support protection mechanism and the support protection mechanism to form a common accommodating space.

Optionally, a supporting surface is disposed on a side of the supporting protection mechanism facing the accommodating space, and in the unfolded state, the supporting surface is used for supporting the deformation area that is not deformed, and the first bearing member, the second bearing member and the supporting surface jointly form a bearing plane for supporting the flexible screen.

Optionally, the support protection mechanism includes a central rotating shaft, and the multi-stage sliding mechanism is connected with the central rotating shaft in a sliding manner so as to slide around the central rotating shaft;

the multistage slip mechanism is close to one side edge of the central rotating shaft and is provided with an arc notch, the arc notch extends along the direction of the central rotating shaft and is provided with an arc profile coaxially arranged with the central rotating shaft, and when in a folding state, two arc notches and a supporting surface between the two arc notches jointly enclose into a containing space.

Optionally, the center pivot includes the pivot portion, the transversal arch of pivot portion is so that the pivot portion includes plane and circumference, the plane is the holding surface, the circumference with the coaxial setting of arc breach, during the expansion state, the arc breach is located the below of holding surface, just the center pivot is located two between the arc breach, during the folding state, the arc breach is located the top of holding surface, and two the arc breach is relative and the interval sets up, and with the holding surface encloses jointly into accommodation space.

Optionally, the support protection mechanism includes a central rotating shaft, each multi-stage sliding mechanism includes a plurality of sliding pieces, the sliding pieces are sequentially connected in a sliding manner and all slide around the central rotating shaft, an angle of rotation of the sliding pieces around the central rotating shaft is a sliding angle, and a sum of a plurality of sliding angles in each multi-stage sliding mechanism is 90 °.

Optionally, each multi-stage sliding mechanism includes two sliding pieces and is respectively a first sliding piece and a second sliding piece, one side of the first sliding piece is connected with a corresponding bearing piece, the other side of the first sliding piece is connected with one side of the second sliding piece in a sliding way, the other side of the second sliding piece is connected with the central rotating shaft in a sliding way, and the first bearing piece and the second bearing piece rotate around the central rotating shaft to drive the first sliding piece to rotate around the central rotating shaft relative to the second sliding piece.

Optionally, the arc breach has been seted up to one side that first slip piece is close to the center pivot, the arc breach is followed the length direction of center pivot extends and runs through first slip piece, arc breach with the coaxial setting of center pivot, two multistage slip mechanism for center pivot symmetry sets up, in the state of expanding, the center pivot is located two between the arc breach, in the state of folding, the arc breach with be located two support surface between the arc breach encloses jointly into accommodation space.

Optionally, the second is rotated the piece and is provided with first arc guide way and offered the second arc guide way along center pivot length direction's both sides, the center pivot first arc guide way the coaxial setting of second arc guide way, first slider is close to one side that the second was rotated the piece is provided with first slider, first slider with first arc guide way slip cooperation, the center pivot is provided with the second slider, the second slider with second arc guide way slip cooperation.

Optionally, the sliding connection mechanism further includes a limiting structure, where the limiting structure is disposed between the first sliding piece and the second sliding piece, and/or the limiting structure is disposed between the second sliding piece and the central rotating shaft, and is used to limit a sliding angle of the sliding pieces, so that after one sliding piece slides in place, the adjacent sliding piece is driven to slide.

Optionally, the quantity of limit structure is two and just is the setting respectively first spacer pin subassembly and the setting that is in between the first piece that slides with the second piece that slides is in the second piece that slides with second spacer pin subassembly between the center pivot, first slider face one side protrusion of first arc guide way is provided with first spacer pin subassembly, the bottom surface of first arc guide way is provided with first arc guide way, first spacer pin subassembly with first arc guide way slip cooperation, the second slider face one side protrusion of second arc guide way is provided with second spacer pin subassembly, the bottom surface of second arc guide way is provided with second arc guide way, second spacer pin subassembly with second arc guide way slip cooperation, the center pivot first arc guide way the coaxial setting of second arc guide way.

Optionally, the first spacer pin subassembly is including the first spacer pin that sets gradually, first elastic component and first plunger, first mounting hole that link up has been seted up to first slider, first mounting hole is the shoulder hole and follows the axial extension of center pivot, the shoulder hole is including aperture and the macropore that coaxial setting, the aperture for the macropore is close to first arc spacing groove, just first spacer pin be provided with shoulder hole complex stepped shaft, first spacer pin slidable inserts and locates first mounting hole is close to the opening of first arc spacing groove one side, first plunger inlays and locates the opening of first mounting hole opposite side, first elastic component compressively set up in the first mounting hole, and both ends butt respectively in first spacer pin with first plunger.

Optionally, the sliding connection mechanism further includes a limiting structure, where the limiting structure is disposed between the multi-stage sliding mechanism and the support protection mechanism, and abuts against the multi-stage sliding mechanism or the support protection mechanism, so as to generate a friction force when the multi-stage sliding mechanism slides around the support protection mechanism.

Optionally, the mounting hole has been seted up to support protection machanism or multistage slip mechanism, limit structure includes spacer pin and elastic component, the spacer pin slidable inserts and locates the mounting hole, the bottom of spacer pin is connected with the elastic component, the elastic component compressively set up in the mounting hole, so that the spacer pin support in multistage slip mechanism or support protection machanism.

Optionally, the support protection mechanism includes a central rotating shaft and two protection pieces, the multi-stage sliding mechanism is connected with the central rotating shaft in a sliding way, the central rotating shaft includes a rotating shaft portion and end plates fixedly connected at two ends of the rotating shaft portion, each protection piece and the corresponding bearing piece are symmetrically arranged at two sides of the rotating shaft portion about an axis of the rotating shaft portion, each protection piece includes a first protection cover and two connection plates, the first protection cover extends along the axial direction of the rotating shaft portion, the connection plates are convexly arranged at two ends of the first protection cover, the two connection plates are respectively connected on the corresponding end plates in a sliding way, so that the protection pieces can slide around the axis of the rotating shaft portion,

in the unfolded state, the sliding connection mechanism is covered by the first bearing piece and the second bearing piece, the protection pieces are closely adjacent and respectively positioned in the corresponding bearing pieces,

In the folding process, the two protection pieces are driven by the corresponding bearing pieces to slide and separate around the rotating shaft part so as to cover the sliding connection mechanism exposed due to the rotation of the bearing pieces.

Optionally, the center pivot still includes the second visor, the second visor is followed the length direction of pivot portion extends, the second visor with pivot portion interval sets up, and length direction's both ends pass through the end plate with pivot portion connects, first visor is located the second visor deviates from the one side of pivot portion, when folding state, the second visor is located two of separation between the first visor to can jointly form and be used for covering the protection body of exposed slip coupling mechanism.

Optionally, the inboard of every the connecting plate is provided with the guide block along the length direction protrusion of second visor, every two third arc guide slots have all been seted up to the end plate, two third arc guide slots for pivot portion symmetry set up and with pivot portion coaxial arrangement, the protection piece passes through the guide block with the third arc guide slot slip cooperation of corresponding side.

Optionally, the edge that center pivot was kept away from to first protective cover outwards protrudes and is provided with the traction strip, the traction strip is followed the length direction of first protective cover extends, first carrier with all offer on the second carrier and be used for holding slip coupling mechanism's holding tank, the bottom of holding tank upwards is protruding to be equipped with the impeller, the impeller is used for promoting the traction strip slip, when the expansion state, the impeller with the traction strip sets up along circumference interval, when the folding state, the impeller with traction strip butt.

Through above-mentioned technical scheme, folding device for flexible screen is in the in-process of converting from the expansion state to folding state, and first carrier and second carrier rotate around supporting protection mechanism, drive the multistage slide mechanism who links to each other with it and roll around supporting protection mechanism, have formed accommodation space through the transformation of the relative position between multistage slide mechanism and the supporting protection mechanism to can hold the slightly convex deformation zone of flexible screen, consequently can minimize the damage that probably causes the flexible screen deformation zone to the casing. Meanwhile, the attaching area of the flexible screen is clamped between the first bearing piece and the second bearing piece, and protection can be formed on the attaching area of the flexible screen.

In another aspect of the disclosure, a mobile terminal is provided, which includes a flexible screen and the folding device for a flexible screen, where the flexible screen is fixedly connected with the first carrier and the second carrier respectively.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

fig. 1 is a schematic cross-sectional view in a left-right direction of a mobile terminal in an unfolded state according to one embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional view in a left-right direction of a mobile terminal in a folded state according to an embodiment of the present disclosure;

FIG. 3 is a schematic perspective view of a multi-stage slide mechanism in an expanded state showing a central spindle according to one embodiment of the present disclosure;

FIG. 4 is a schematic perspective view of a multi-stage slide mechanism in a folded state showing a central spindle according to one embodiment of the present disclosure;

FIG. 5 is a schematic side view of a multi-stage slide mechanism in a folded state showing a central spindle according to one embodiment of the present disclosure;

FIG. 6 is an exploded schematic view of the structure of the central spindle and the second slider of one embodiment of the present disclosure;

FIG. 7 is an exploded schematic view of a center shaft and a first runner equipped with a second runner in accordance with an embodiment of the present disclosure;

FIG. 8 is a schematic perspective view of a central spindle according to one embodiment of the present disclosure;

FIG. 9 is a schematic perspective view of a second slider according to one embodiment of the present disclosure;

FIG. 10 is an exploded schematic view of a first slider and first pin assembly of one embodiment of the present disclosure;

FIG. 11 is a schematic perspective view of two protecting members of a folding device according to an embodiment of the present disclosure in a folded state, wherein a part of a center rotational shaft is shown;

FIG. 12 is a schematic perspective view of a protector according to one embodiment of the present disclosure;

FIG. 13a is a schematic side view of two protectors of a folding device of an embodiment of the present disclosure in a folded state, in which a portion of a central rotational axis is shown;

FIG. 13b is a schematic side view of two protectors of a folding device of an embodiment of the present disclosure in an unfolded state, in which a portion of a central rotational axis is shown;

FIG. 14 is a schematic perspective view of a multi-stage slide mechanism and support protection mechanism in a folded state according to one embodiment of the present disclosure;

Fig. 15 is a schematic perspective view of a mobile terminal in a folded state according to an embodiment of the present disclosure.

Description of the reference numerals

10-a first carrier; 11-a receiving groove; 12-pushing blocks; 20-a second carrier; 30-supporting a protection mechanism; 31-a central spindle; 311-rotating shaft part; 3111-a support surface; 312-a second protective cover; 313-slip fit; 3131-a second slider; 314-end plates; 315-a second mounting hole; 3141-a third arcuate guide slot; 32-a protector; 321-a first protective cover; 3211-drawing bar; 322-connecting plates; 3221-a guide block; 40-a multi-stage slip mechanism; 41-a first runner; 411-arc notch; 412-a first slider; 413-a first mounting hole; 42-a second runner; 421-first arcuate guide slot; 4211-a first arc-shaped limit groove; 422-a second arcuate guide slot; 4221-a second arc-shaped limit groove; 50-accommodating space; 60-a first stop pin assembly; 61-a first limiting pin; 62-a first elastic member; 63-a first plunger; 70-a second stop pin assembly; 80-supporting plates; 200-a mobile terminal; 201-deformation zone; 202-attachment zone.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise stated, terms such as "upper and lower" are used to generally refer to the side on which the flexible screen is mounted being up and the side away from the mounting side of the flexible screen being down when the folding device for flexible screen is in the unfolded state, and specifically, reference may be made to the direction of the drawing plane as shown in fig. 1, and "inner and outer" refer to the inner and outer of the contour of the relevant parts. The "left and right" are perpendicular to both sides of the longitudinal direction of the central rotation shaft 31, and concretely, reference may be made to the direction of the drawing as shown in fig. 1, and the "front and rear" are along the longitudinal direction of the central rotation shaft 31, and concretely, reference may be made to the direction of the drawing as shown in fig. 3. The thickness refers to a height dimension perpendicular to the direction of the flexible screen when the folding device for the flexible screen is applied to the mobile terminal 200, and specifically, reference may be made to a height dimension in the up-down direction in the drawing plane as shown in fig. 1. "sliding" of components in this disclosure refers to relative rotation of two components while sliding relative to each other. The "coaxial arrangement" of the arc-shaped limit grooves, the arc-shaped guide grooves and the central rotation shaft 31 means that the axes of the arc-shaped contours of these grooves are coaxial with the axis of the central rotation shaft 31.

In the present disclosure, the flexible screen includes two conforming areas 202 and a deforming area 201 connected between the conforming areas 202, the two conforming areas 202 being secured to the first carrier 10 and the second carrier 20, respectively. When the folding device for a flexible screen is applied to the mobile terminal 200, as shown in fig. 1 and 2, hereinafter, in this disclosure, the attaching regions 202 of the flexible screen are attached to each other when the mobile terminal 200 is in a folded state, and are sandwiched between the first carrier 10 and the second carrier 20, and this is described as an example.

Furthermore, the terms "first," "second," "third," and the like, as used in embodiments of the present disclosure, are used for distinguishing one element from another and not for sequential or importance.

As shown in fig. 1-15, the present disclosure provides a folding device for a flexible screen, the folding device including a first carrier 10, a second carrier 20, and a slip connection mechanism connected between the first carrier 10 and the second carrier 20. The first carrier 10 and the second carrier 20 are used to jointly carry a flexible screen. The slip linkage includes a support protection mechanism 30 and two multi-stage slip mechanisms 40. The two multi-stage sliding mechanisms 40 are disposed at the left and right sides of the support protection mechanism 30 and are connected to the first bearing member 10 and the second bearing member 20 in a one-to-one correspondence manner, and the multi-stage sliding mechanisms 40 are connected to the support protection mechanism 30 in a sliding manner. During folding or unfolding, the first carrier 10 and the second carrier 20 are rotated about the support protection mechanism 30 by the corresponding multi-stage slide mechanism 40, respectively. And during folding the first carrier 10 and the second carrier 20 are brought close to each other such that the two conforming areas 202 of the flexible screen conform and the deformation area 201 between the two conforming areas 202 is deformed. The flexible screen is now located between the first carrier 10 and the second carrier 20. And the deformation zone 201 can be accommodated in the accommodation space 50 formed by the multi-stage slide mechanism 40 and the support protection mechanism 30 together.

Through the above technical solution, in the process of converting the folding device for the flexible screen from the unfolded state to the folded state, the first bearing member 10 and the second bearing member 20 rotate around the supporting protection mechanism 30, drive the multi-stage sliding mechanism connected with the first bearing member and the second bearing member to slide around the supporting protection mechanism 30, and form the accommodating space 50 through the transformation of the multi-stage sliding mechanism structure and the transformation of the relative position between the multi-stage sliding mechanism structure and the supporting protection mechanism 30, so that the slightly convex deformation zone 201 of the flexible screen can be accommodated, and therefore, the damage to the deformation zone 201 of the flexible screen can be reduced as much as possible. Meanwhile, the attaching region 202 of the flexible screen is sandwiched between the first bearing member 10 and the second bearing member 20, so that protection can be formed on the attaching region 202 of the flexible screen.

Further, as shown in fig. 1, a support surface 3111 is provided on a side of the support protection mechanism 30 facing the accommodating space 50. In the unfolded state, the support surface 3111 is for supporting the deformation zone 201 without deformation, and the first carrier 10, the second carrier 20 and the support surface 3111 together form a carrier plane for supporting the flexible screen. The support surface 3111 corresponds to the deformation zone 201 of the flexible screen. In the deployed state, the support surface 3111 is capable of supporting the deformation zone 201 in the undeformed state of the flexible screen. And the upper surface of the first carrier 10, the upper surface of the second carrier 20 and the support surface 3111 are substantially in the same plane. Thus, together form a load-bearing plane for supporting the flexible screen, which effectively supports and protects the flexible screen in the unfolded state.

Optionally, in one embodiment of the present disclosure, a support plate 80 for supporting the flexible screen is also fixedly provided between the flexible screen and the

carrier

10, 20. In the unfolded state, the contact surface between the support plate 80 and the flexible screen is completely horizontal, so that the flexible screen in the unfolded state can be well supported. Damage to the flexible screen from direct contact with the moving multi-stage slip mechanism 40 can also be avoided.

As shown in fig. 2 to 5, the support and protection mechanism 30 includes a central rotation shaft 31, and a multi-stage sliding mechanism 40 is slidably connected to the central rotation shaft 31 to slide around the central rotation shaft 31. The edge of one side of the multi-stage sliding mechanism 40, which is close to the central rotating shaft 31, is provided with an arc notch 411, and the arc notch 411 extends along the direction of the central rotating shaft 31 and has an arc profile coaxially arranged with the central rotating shaft 31. In the folded state, the two arc-shaped notches 411 and the support surface 3111 between the two arc-shaped notches 411 together define the accommodating space 50.

Because the arc-shaped notch 411 and the central rotating shaft 31 are coaxially arranged, when the folding mechanism is folded, the arc-shaped notch 411 slides to the upper side of the supporting surface 3111 around the central rotating shaft 31 along with the multi-stage sliding mechanism, the arc-shaped notch 411 on two sides and the supporting surface 3111 between the arc-shaped notches 411 jointly enclose an accommodating space 50 for accommodating the deformation area 201 of the flexible screen, and the accommodating space 50 is approximately cylindrical with an opening at the upper side, so that an accommodating space can be just provided for the deformation area 201 of the flexible screen.

As shown in fig. 1 to 8, the center rotary shaft 31 includes a rotary shaft portion 311, and the rotary shaft portion 311 has an arcuate cross section such that the rotary shaft portion 311 includes a flat surface and a circumferential surface. The plane is the supporting surface 3111, and the circumferential surface is disposed coaxially with the arc-shaped notch 411. In the unfolded state, the arc-shaped notch 411 is located below the supporting surface 3111, and the central rotating shaft 31 is located between the two arc-shaped notches 411. When in a folded state, the arc-shaped notches 411 are located above the supporting surface 3111, and the two arc-shaped notches 411 are opposite and spaced apart, and together with the supporting surface 3111, define the accommodating space 50.

By providing the arcuate shaft portion 311, not only a rotation center can be provided for the multi-stage sliding mechanism, but also space occupation is reduced, which is conducive to forming the accommodating space 50 together with the arcuate slot. During the unfolding process, the arc-shaped notch 411 rotates around the rotation shaft part 311, and the rotation shaft part 311 of the central rotation shaft 31 is positioned between the arc-shaped notches 411 at two sides, so that the movement of the arc-shaped notch 411 is not interfered. During folding, the arc-shaped notches 411 rotate around the shaft portion 311, and rotate from the lower side of the support surface 3111 to the upper side of the support surface 3111, and the arc-shaped notches 411 on both sides and the support surface 3111 located between the arc-shaped notches 411 jointly enclose the accommodating space 50 for accommodating the deformation zone 201 of the flexible screen.

As shown in fig. 3 and 4, the support and protection mechanism 30 includes a central rotation shaft 31, each multi-stage sliding mechanism 40 includes a plurality of sliding members which are sequentially connected in sliding manner and each of which slides around the central rotation shaft 31, the angle by which the sliding member rotates around the central rotation shaft 31 is a sliding angle, and the sum of the plurality of sliding angles in each multi-stage sliding mechanism 40 is 90 °.

The

carriers

10, 20 need to be rotated 90 ° when rotating, and the components on the multi-stage slide mechanism 40 connected thereto also need to be rotated 90 ° with respect to the central rotation shaft 31. If only one sliding piece is arranged on each side of the central rotating shaft 31, the corresponding bearing

pieces

10 and 20 are driven to rotate 90 degrees by rotating the sliding pieces by 90 degrees, and the sliding pieces on both sides of the central rotating shaft 31 need to rotate 90 degrees around the central rotating shaft 31, so that more movable space is needed for each sliding piece. In addition, in order to avoid mutual interference of sliding and rotating parts at two sides, a limiting mechanism needs to be added to control the rotating stroke. Meanwhile, in the unfolded state, all mechanisms need to be disposed below the flexible screen, so that the moving space of the mechanisms is limited, and in order to rotate the sliding member by 90 °, the thickness of the whole folding device for the flexible screen must be increased, which cannot meet the requirement of light and thin application in the mobile terminal 200.

By providing a plurality of sliders, when the

carriers

10, 20 rotate, the plurality of sliders are driven to sequentially slide around the central rotating shaft 31, and the rotation of the

carriers

10, 20 is completed together by the superposition of the rotations of the sliders. So set up, every slip piece required pivoted angle is less, and required space is also less, is convenient for miniaturized multistage slip mechanism 40 to can reduce the holistic thickness of folding device for flexible screen, when being applied to mobile terminal 200, can make mobile terminal 200 frivolous more. In addition, a limiting structure can be conveniently arranged between the sliding pieces to limit the sliding angle of the sliding pieces under the condition of not increasing the thickness, so that the movement track of the multi-stage sliding mechanism 40 is controllable.

The number is not limited in the present disclosure, and may be flexibly set according to design requirements. In one embodiment of the present disclosure, each multi-stage slip mechanism 40 includes two slips, a first slip 41 and a second slip 42, respectively. One side of the first sliding piece 41 is connected with the corresponding bearing

pieces

10 and 20, the other side of the first sliding piece 41 is connected with one side of the second sliding piece 42 in a sliding way, the other side of the second sliding piece 42 is connected with the central rotating shaft 31 in a sliding way, and the first bearing piece 10 and the second bearing piece 20 rotate around the central rotating shaft 31 to drive the first sliding piece 41 to slide around the central rotating shaft 31 relative to the second sliding piece 42. The sum of the slip angles of the first slip 41 and the second slip 42 is 90 °.

In the folding process, when the carrying

members

10 and 20 rotate around the central rotating shaft 31, the first sliding member 41 is driven to slide around the central rotating shaft 31 by a first sliding angle relative to the second sliding member 42, after the first sliding member 41 slides around the central rotating shaft 31 by the first sliding angle, the second sliding member 42 is driven to slide around the central rotating shaft 31 by a second sliding angle, and the sum of the first sliding angle and the second sliding angle is 90 degrees, so that the carrying

members

10 and 20 can rotate around the central rotating shaft 31 by 90 degrees. By providing a two-stage slip, on the one hand, the space required for the rotation of the slip can be made smaller, facilitating miniaturization of the multi-stage slip mechanism 40. On the other hand, the structural complexity of the sliding parts with excessive layers is avoided, and the processing difficulty is also obviously increased by the too small sliding parts.

It will be appreciated that in other embodiments of the present disclosure, other numbers of sliders may be provided, such as fig. 3 or 4, which in turn are slid by the

carriers

10, 20.

Specific numbers of the first slip angle and the second slip angle are not limited in the present disclosure, and may be flexibly set according to design requirements. In one embodiment of the present disclosure, the first slip angle and the second slip angle are both 45 °. This effectively reduces the space required for rotation of each runner, minimizing the volume of the multi-stage runner mechanism 40, without increasing the difficulty of machining by undersizing one runner. And meanwhile, a limiting structure is convenient to set between the sliding parts to limit the sliding angle of the sliding parts.

As shown in fig. 2, 4, 5 and 7, an arc-shaped notch 411 is formed on one side of the first sliding member 41 near the central rotating shaft 31, the arc-shaped notch 411 extends along the length direction of the central rotating shaft 31 and penetrates through the first sliding member 41, the arc-shaped notch 411 and the central rotating shaft 31 are coaxially arranged, and the two multi-stage sliding mechanisms 40 are symmetrically arranged relative to the central rotating shaft 31. In the unfolded state, the central rotating shaft 31 is positioned between the two arc-shaped notches 411. In the folded state, the arc-shaped notch 411 and the support surface 3111 between the two arc-shaped notches 411 together enclose the accommodating space 50.

When the folding device for the flexible screen is in a folded state, the two opposite first sliding rotating pieces 41 and the central rotating shaft 31 which are arranged at intervals form a space for accommodating the flexible screen together, and the rectangular space on the upper side is used for accommodating the attaching area 202 of the flexible screen. At the same time, the arc-shaped groove formed in the first slider 41 and the support surface 3111 together enclose the receiving space 50 for receiving the deformation region 201 of the flexible screen. Thus, the flexible screen in the folded state can be effectively protected.

As shown in fig. 3 and fig. 6-10, the second sliding member 42 is provided with a first arc-shaped guide groove 421 and a second arc-shaped guide groove 422 along two sides of the length direction of the central rotating shaft 31, the first arc-shaped guide groove 421 and the second arc-shaped guide groove 422 are coaxially arranged, one side, close to the second sliding member 42, of the first sliding member 41 is provided with a first sliding block 412, the first sliding block 412 is in sliding fit with the first arc-shaped guide groove 421, the central rotating shaft 31 is provided with a second sliding block 3131, and the second sliding block 3131 is in sliding fit with the second arc-shaped guide groove 422.

Through the slip cooperation between slider and the arc guide slot for the motion of slip piece is smoother. By providing the second slider 3131 on the center rotation shaft 31, the strength of the center rotation shaft 31 can be increased compared to providing the arc-shaped guide groove on the center rotation shaft 31. The first arc-shaped guide groove 421 and the second arc-shaped guide groove 422 are arranged on the second sliding piece 42, so that on one hand, sliding of the first sliding piece 41 relative to the second sliding piece 42 and sliding of the second sliding piece 42 relative to the central rotating shaft 31 can be guided respectively, and on the other hand, weight of the second sliding piece 42 can be reduced, and the first sliding piece 41 can conveniently drive the second sliding piece 42 to slide. Moreover, the central rotating shaft 31, the first arc-shaped guide groove 421 and the second arc-shaped guide groove 422 are coaxially arranged, so that the second sliding piece 42 can slide along the central rotating shaft 31, the first sliding piece 41 can slide along the second sliding piece 42, the requirement on movement space is reduced, the structure is compact, the occupied space is small, and the requirement on light and thin mobile terminal 200 is met.

In the present disclosure, the slip connection mechanism further includes a limiting structure disposed between adjacent slip pieces and/or between the slip pieces and the central rotating shaft 31 for limiting a slip angle of the slip pieces so that one slip piece is slid in place and then drives the slip piece adjacent thereto to slip.

It should be noted that, in the present disclosure, sliding in place means that the sliding member rotates around the central rotation shaft 31 by a predetermined sliding angle. As described above, in one of the embodiments, the rotation angles of the first slider and the second slider are each 45 °. The first sliding piece slides 45 degrees and then drives the second sliding piece to rotate 45 degrees. The sliding angle of the sliding piece can be conveniently controlled by arranging the limiting structure, and movement interference caused by excessive sliding or folding movement errors caused by excessive sliding can be avoided.

In the present disclosure, the number of limit structures may be consistent with the number of sliders, and the specific number of limit structures is not limited. And the specific structure of the limiting structure is not limited, and the limiting structure can be designed into any structure and shape according to the limiting requirement of the sliding piece. In one embodiment, as shown in fig. 6-10, the spacing structure is generally pin-like. Specifically, the number of the limiting structures is two and is the first limiting pin assembly 60 and the second limiting pin assembly 70, respectively. The first slider 412 is provided with a first limiting pin assembly 60 facing one side of the first arc-shaped guide groove 421 in a protruding manner, and a first arc-shaped limiting groove 4211 is provided at the bottom surface of the first arc-shaped guide groove 421. The first limiting pin assembly 60 is in sliding fit with the first arc-shaped limiting groove 4211, and a second limiting pin assembly 70 is arranged on one side of the second sliding block 3131, which faces the second arc-shaped guiding groove 422, in a protruding mode. The bottom surface of the second arc-shaped guide groove 422 is provided with a second arc-shaped limiting groove 4221, and the second limiting pin assembly 70 is in sliding fit with the second arc-shaped limiting groove 4221. The central rotating shaft 31, the first arc-shaped limiting groove 4211 and the second arc-shaped limiting groove 4221 are coaxially arranged.

The limiting pin assembly is matched with the arc limiting groove to limit the maximum sliding angle of the sliding piece. The bottom of the arc-shaped guide groove is provided with the arc-shaped limit groove, so that the coaxiality of the arc-shaped guide groove and the arc-shaped limit groove is guaranteed during processing, and the processing difficulty is reduced. Moreover, through such position setting, the spacer pin subassembly inserts in the arc spacing groove from the arc guide way, can not occupy extra guide way outer space for whole compact structure, the size is little.

It will be appreciated that in other embodiments of the present disclosure, the positions of the locating pin assembly and the arcuate locating slot may be interchanged, such as providing the first arcuate locating slot 4211 on the first slider 412 and the first locating pin assembly 60 on the second slider. Alternatively, in other embodiments, the maximum slip angle of the slider is limited by providing stops on the arcuate guide slots.

As shown in fig. 7 and 10, the first stopper pin assembly 60 includes a first stopper pin 61, a first elastic member 62, and a first plunger 63 sequentially disposed, and the first slider 412 is provided with a first mounting hole 413 therethrough, and the first mounting hole 413 is a stepped hole and extends in the axial direction of the central rotating shaft 31. The stepped bore (not shown) includes a small bore and a large bore coaxially disposed, the small bore being adjacent the first arcuate limit groove 4211 relative to the large bore. And the first limiting pin 61 is provided with a stepped shaft matched with the stepped hole, the first limiting pin 61 is slidably inserted into the opening of the first mounting hole 413 close to one side of the first arc limiting groove 4211, the first plunger 63 is embedded into the opening of the other side of the first mounting hole 413, the first elastic piece 62 is compressively arranged in the first mounting hole 413, and two ends of the first elastic piece are respectively abutted against the first limiting pin 61 and the first plunger 63.

By providing the stepped hole and the first plunger 63, the displacement of the first stopper pin 61 in the axial direction can be restricted, and the first stopper pin 61 is prevented from coming off the first mounting hole 413. And can make things convenient for the installation of first spacer pin assembly 60, but also can adjust the elastic force of first elastic component 62 through adjusting the distance between first plunger 63 and the first spacer pin 61 to apply the suitable clamping force of size to second slip piece 42, can obtain the frictional force of suitable size when folding or rotating to make the user can obtain the best friction feel when using, improve user's use experience.

In one embodiment of the present disclosure, as shown in fig. 6-8, the second stop pin assembly 70 and the first stop pin assembly 60 are similar in structure, and the second slider 3131 is provided with a second mounting hole 315 similar to the first mounting hole 413, the second stop pin assembly 70 is inserted into the second mounting hole 315 on the second slider 3131, and the stop pin in the second stop pin assembly 70 abuts against the bottom of the second arc-shaped stop slot 4221 on the second slider 42. When the second sliding member 42 slides, the second limiting pin slides along the second arc-shaped limiting groove 4221.

In the context of the present disclosure, the elastic member may be a compression spring, or may be a conventional spring, a spring plate, a hollow rubber tube, or other elastic mechanism.

As shown in fig. 6-10, the slip connection mechanism further includes a limiting structure. The limiting structure is disposed between the multi-stage sliding mechanism 40 and the support protection mechanism 30, and abuts against the multi-stage sliding mechanism 40 or the support protection mechanism 30, so as to generate a friction force when the multi-stage sliding mechanism 40 slides around the support protection mechanism 30. The above-mentioned limit structure not only can limit the maximum sliding angle of the sliding member, but also can make the limit pin prop against the multistage sliding mechanism 40 or support the protection mechanism 30 through the elastic force of the elastic member, thereby produce friction force when the relative motion takes place between multistage sliding mechanism 40 and support protection mechanism 30, make the user obtain more obvious damping sense or friction feel in the process of rotating or folding, make the user obtain good use experience.

In another embodiment of the present disclosure, the support protection mechanism 30 or the multi-stage slip mechanism 40 is provided with a mounting hole, and the limiting structure includes a limiting pin and an elastic member. The limiting pin is slidably inserted into the mounting hole, the bottom of the limiting pin is connected with an elastic piece, and the elastic piece is compressively arranged in the mounting hole, so that the limiting pin is propped against the multistage sliding mechanism 40 or the support protection mechanism 30. The limiting pin can be abutted against the multistage sliding mechanism 40 or the supporting protection mechanism 30 through the elastic force of the elastic piece, so that friction force is generated when the multistage sliding mechanism 40 and the supporting protection mechanism 30 perform relative movement, a user can obtain obvious damping sense or friction hand feeling in the rotating or folding process, and the user can obtain good use experience.

As shown in fig. 11-15, and with reference to fig. 1 and 2. The support and protection mechanism 30 includes a central rotating shaft 31 and two protection members 32. The multi-stage sliding mechanism 40 is slidably connected to the central rotating shaft 31, and the central rotating shaft 31 includes a rotating shaft portion 311 and end plates 314 fixedly connected to both ends of the rotating shaft portion 311. Each of the protection members 32 and the corresponding carrier member are disposed symmetrically on both sides of the rotation shaft portion 311 with respect to the axis of the rotation shaft portion 311. Each protector 32 includes a first protection cover 321 and two connection plates 322. The first protective cover 321 extends along the axial direction of the rotating shaft portion 311. The connecting plates 322 are disposed at two ends of the first protecting cover 321 in a protruding manner, and the two connecting plates 322 are respectively slidably connected to the corresponding end plates 314, so as to enable the protecting member 32 to slide around the axis of the shaft portion 311. In the unfolded state, the sliding connection mechanism is covered by the first bearing piece 10 and the second bearing piece 20, and the protecting pieces 32 are closely adjacent to and respectively positioned inside the corresponding bearing

pieces

10 and 20;

during folding, the two protection members 32 are slid and separated about the shaft portions 311 by the corresponding

carriers

10, 20 to cover the slide connection exposed by the rotation of the

carriers

10, 20.

In the folded state, if the shielding structure is not provided, the

carriers

10 and 20 are close to each other when rotating, and part of the structure of the sliding connection mechanism can lose shielding of the

carriers

10 and 20 and be exposed, so that the overall aesthetic property of the folding device is affected.

Through the above technical scheme, in the folding process, under the drive of the bearing

parts

10, 20, the two protecting parts 32 are separated, the two first protecting covers 321 are unfolded to cover the gap between the central rotating shaft 31 and the bearing

parts

10, 20, so that the sliding connection mechanism is prevented from being exposed, and the dustproof effect can be achieved. In addition, in the unfolded state, the protecting member 32 is stored in the bearing

members

10 and 20, so that no extra space is occupied, and meanwhile, the whole structure is more attractive through covering the sliding connection mechanism by the bearing

members

10 and 20.

Specifically, as shown in fig. 8, a slip engagement portion 313 is fixedly provided on the rotation shaft portion 311, and a second slider 3131 is provided on an end portion of the slip engagement portion 313, the second slider 3131 being for engagement with the second slider 42.

As shown in fig. 6, 8 and 11-15, the central rotating shaft 31 further includes a second protection cover 312, the second protection cover 312 extends along the length direction of the rotating shaft 311, the second protection cover 312 is spaced from the rotating shaft 311, two ends of the length direction are connected with the rotating shaft 311 through end plates 314, the first protection cover 321 is located at one side of the second protection cover 312 facing away from the rotating shaft 311, and in the folded state, the second protection cover 312 is located between the two separated first protection covers 321, so as to jointly form a protection body for covering the exposed sliding connection mechanism.

Through setting up the protection body and can cover the slip coupling mechanism that probably exposes because

carrier

10, 20 rotate comprehensively, simultaneously, also can be completely with flexible screen with folding device inside and external isolation, can prevent effectively that the dust from getting into, prevent that the dust from causing the influence to the electronic component in flexible screen or the mobile terminal 200, also make the whole more pleasing to the eye of structure simultaneously.

As shown in fig. 11 to 15, a guide block 3221 is convexly provided on the inner side of each connecting plate 322 along the length direction of the second protection cover 312, two third arc-shaped guide grooves 3141 are provided on each end plate 314, the two third arc-shaped guide grooves 3141 are symmetrically provided with respect to the rotating shaft portion 311 and coaxially provided with the rotating shaft portion 311, and the protection member 32 is slidably engaged with the third arc-shaped guide groove 3141 on the corresponding side through the guide block 3221.

The sliding movement of the slider is smoother by the sliding fit between the guide block 3221 and the arcuate guide channel. The third arc-shaped guide groove 3141 is coaxially arranged with the rotating shaft portion 311, so that the protecting piece 32 can slide close to the rotating shaft portion 311 when moving, the requirement for movement space is reduced, the structure is compact, the occupied space is small, and the requirement for light and thin application to the mobile terminal 200 is met.

As shown in fig. 11-15, referring to fig. 1 and 2, a traction bar 3211 is provided on the edge of the first protection cover 321 away from the central rotating shaft 31, the traction bar 3211 extends along the length direction of the first protection cover 321, a containing groove 11 for containing a sliding connection mechanism is formed in each of the first bearing member 10 and the second bearing member 20, a pushing block 12 is provided on the bottom of the containing groove 11 in an upward protruding manner, the pushing block 12 is used for pushing the traction bar 3211 to slide, in the unfolded state, the pushing block 12 and the traction bar 3211 are arranged at intervals along the circumferential direction, and in the folded state, the pushing block 12 is abutted to the traction bar 3211.

When switching from the fully unfolded state to the folded state, the protection member 32 will not move along with the

carriers

10, 20 at the beginning, until the traction bar 3211 contacts the pushing block 12 on the

carriers

10, 20, and the protection member 32 slides and unfolds relative to the central rotating shaft 31 under the action of the pushing force of the pushing block 12. And the traction bar 3211 extends along the axial direction, so that synchronous movement of the guide blocks 3221 at two sides along the length direction can be ensured, and the phenomenon that one end is excessively slipped to cause clamping is avoided.

In one embodiment of the present disclosure, the support and protection mechanism 30 is configured to be symmetrical about the axis of the central rotating shaft 31, so that the multi-stage sliding mechanisms 40 on the left and right sides can be engaged. Also, in order to enable the flexible screen to be folded or unfolded simultaneously in the front-rear direction, in one embodiment of the present disclosure, each of the multi-stage sliding mechanisms 40 located at both sides of the center rotational shaft 31 includes two sets of first sliding pieces 41 and second sliding pieces 42 that are engaged with each other, the two sets of sliding pieces being disposed at intervals in the front-rear direction of the center rotational shaft 31, respectively. And as shown in fig. 3, 4 and 6, two second sliders 42 located on the same side are connected as one and the same piece. This helps to maintain the synchronous movement of the second slider on the front and rear sides, thereby ensuring the synchronous movement of the entire folding device on the front and rear sides.

As shown in fig. 1, 2 and 15, there is also provided a mobile terminal 200 in the present disclosure, the mobile terminal 200 including a flexible screen fixedly connected to the first carrier 10 and the second carrier 20, respectively, and a folding device for the flexible screen as described above.

When the mobile terminal 200 is unfolded or folded, the first bearing member 10 and the second bearing member 20 surround and drive the multi-stage sliding mechanism 40 to slide, specifically, the bearing

members

10 and 20 drive the first sliding member 41 to slide relative to the second sliding member 42, so that the second sliding member 42 slides relative to the central rotating shaft 31, and through the transformation of the relative positions between the multi-stage sliding mechanism and the supporting protection mechanism 30 and the unfolding of the first sliding member 41 and the second sliding member 42, an accommodating space 50 is formed, so that the convex deformation region 201 of the flexible screen can be accommodated, and the damage to the deformation region 201 of the flexible screen is reduced as much as possible. Moreover, when folding, the two protection pieces 32 are separated under the driving of the carrying

pieces

10 and 20, the two first protection covers 321 are unfolded, and the two first protection covers 321 and the second protection cover 312 positioned between the two first protection covers 321 can jointly form a protection body for covering the exposed sliding and rotating connection mechanism, so that dust can be effectively prevented from entering, and the whole structure is more attractive.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. The utility model provides a folding device for flexible screen, characterized by includes first carrier (10), second carrier (20) and connects in between first carrier (10) and second carrier (20) slip coupling mechanism, first carrier (10) and second carrier (20) are used for jointly bearing flexible screen, slip coupling mechanism includes support protection mechanism (30) and two multistage slip mechanisms (40), two multistage slip mechanisms (40) set up in support protection mechanism's (30) both sides and with first carrier (10) and second carrier (20) one-to-one connection, multistage slip mechanisms (40) with support protection mechanism (30) slip coupling, in folding or expansion process, first carrier (10) and second carrier (20) are respectively through corresponding multistage slip mechanisms (40) around support protection mechanism (30) rotation to in folding process, first carrier (10) and second carrier (10) are close to each other with flexible district (202) are laminated with two flexible deformation district (202) between the laminating each other, and the deformation zone (201) can be accommodated in an accommodating space (50) formed by the multistage sliding mechanism (40) and the support protection mechanism (30);

A supporting surface (3111) is arranged on one side of the supporting protection mechanism (30) facing the accommodating space (50), the supporting surface (3111) is used for supporting the deformation zone (201) which is not deformed when in an unfolded state, and the first bearing piece (10), the second bearing piece (20) and the supporting surface (3111) form a bearing plane for supporting the flexible screen together;

the support protection mechanism (30) comprises a central rotating shaft (31), and the multi-stage sliding mechanism (40) is in sliding connection with the central rotating shaft (31) so as to slide around the central rotating shaft (31);

the multistage slip mechanism (40) is close to one side edge of the central rotating shaft (31) and is provided with an arc notch (411), the arc notch (411) extends along the direction of the central rotating shaft (31) and is provided with an arc profile coaxially arranged with the central rotating shaft (31), and when in a folding state, two arc notches (411) and a supporting surface (3111) between the two arc notches (411) jointly enclose into the accommodating space (50).

2. The folding device for a flexible screen according to claim 1, wherein the central rotating shaft (31) comprises a rotating shaft portion (311), the cross section of the rotating shaft portion (311) is arched so that the rotating shaft portion (311) comprises a plane and a circumferential surface, the plane is the supporting surface (3111), the circumferential surface is coaxially arranged with the arc-shaped notch (411), the arc-shaped notch (411) is located below the supporting surface (3111) in the unfolded state, the central rotating shaft (31) is located between the two arc-shaped notches (411), the arc-shaped notch (411) is located above the supporting surface (3111) in the folded state, and the two arc-shaped notches (411) are opposite and spaced apart and form the accommodating space (50) together with the supporting surface (3111).

3. A folding device for flexible screens according to claim 1, characterized in that the support protection mechanism (30) comprises a central rotation shaft (31), each of the multi-stage sliding mechanisms (40) comprises a plurality of sliding members which are sequentially connected in sliding manner and all slide around the central rotation shaft (31), the sliding members rotate around the central rotation shaft (31) by a sliding angle, and the sum of the sliding angles corresponding to the sliding members in each of the multi-stage sliding mechanisms (40) is 90 °.

4. A folding device for flexible screens according to claim 3, characterized in that each multi-stage slider mechanism (40) comprises two sliders, a first slider (41) and a second slider (42), respectively, one side of the first slider (41) is connected with the corresponding carrier (10, 20), the other side of the first slider (41) is connected with one side of the second slider (42) in a sliding way, the other side of the second slider (42) is connected with the central rotating shaft (31) in a sliding way, and the first carrier (10) and the second carrier (20) rotate around the central rotating shaft (31) to drive the first slider (41) to rotate around the central rotating shaft (31) relative to the second slider (42).

5. The folding device for a flexible screen according to claim 4, wherein an arc gap (411) is formed on one side of the first sliding member (41) near the central rotating shaft (31), the arc gap (411) extends along the length direction of the central rotating shaft (31) and penetrates through the first sliding member (41), the arc gap (411) and the central rotating shaft (31) are coaxially arranged, the two multi-stage sliding mechanisms (40) are symmetrically arranged relative to the central rotating shaft (31), in the unfolded state, the central rotating shaft (31) is located between the two arc gaps (411), and in the folded state, the arc gap (411) and a supporting surface (3111) located between the two arc gaps (411) jointly enclose the accommodating space (50).

6. The folding device for a flexible screen according to claim 4, wherein a first arc-shaped guide groove (421) and a second arc-shaped guide groove (422) are arranged on two sides of the second sliding part (42) along the length direction of the central rotating shaft (31), the first arc-shaped guide groove (421) and the second arc-shaped guide groove (422) are coaxially arranged, a first sliding block (412) is arranged on one side, close to the second sliding part (42), of the first sliding part (41), the first sliding block (412) is in sliding fit with the first arc-shaped guide groove (421), a second sliding block (3131) is arranged on the central rotating shaft (31), and the second sliding block (3131) is in sliding fit with the second arc-shaped guide groove (422).

7. A folding device for flexible screens according to claim 6, characterized in that the slip connection mechanism further comprises a limit structure arranged between the first slip member (41) and the second slip member (42) and/or between the second slip member (42) and the central rotation shaft (31) for limiting the slip angle of the slip members (41, 42) so that one slip member is slid in place and then drives the slip member adjacent thereto.

8. The folding device for a flexible screen according to claim 7, wherein the number of the limiting structures is two and is a first limiting pin assembly (60) arranged between the first sliding member (41) and the second sliding member (42) and a second limiting pin assembly (70) arranged between the second sliding member (42) and the central rotating shaft (31), one side of the first sliding block (412) facing the first arc-shaped guiding groove (421) is provided with the first limiting pin assembly (60) in a protruding mode, the bottom surface of the first arc-shaped guiding groove (421) is provided with a first arc-shaped limiting groove (4211), the first limiting pin assembly (60) is in sliding fit with the first arc-shaped limiting groove (4211), one side of the second sliding block (3131) facing the second arc-shaped guiding groove (422) is provided with the second limiting pin assembly (70), the bottom surface of the second arc-shaped guiding groove (422) is provided with a second limiting groove (4221), and the second arc-shaped guiding groove (4231) is provided with a second limiting pin assembly (4211) in a sliding mode, and the second arc-shaped guiding groove (4231) is provided with a coaxial limiting groove (4211).

9. The folding device for a flexible screen according to claim 8, wherein the first limiting pin assembly (60) comprises a first limiting pin (61), a first elastic member (62) and a first plunger (63) which are sequentially arranged, the first slider (412) is provided with a through first mounting hole (413), the first mounting hole (413) is a stepped hole and extends along the axial direction of the central rotating shaft (31), the stepped hole comprises a small hole and a large hole which are coaxially arranged, the small hole is close to the first arc-shaped limiting groove (4211) relative to the large hole, the first limiting pin (61) is provided with a stepped shaft matched with the stepped hole, the first limiting pin (61) is slidably inserted into an opening on one side of the first mounting hole (413) close to the first arc-shaped limiting groove (4211), the first plunger (63) is embedded into an opening on the other side of the first mounting hole (413), and the first elastic member (62) is compressively arranged in the first mounting hole (413) and is in contact with the first limiting pin (63) and the first plunger (61).

10. A folding device for flexible screens according to claim 1, characterized in that the sliding connection mechanism further comprises a limit structure, which is arranged between the multi-stage sliding mechanism (40) and the support protection mechanism (30) and is abutted against the multi-stage sliding mechanism (40) or the support protection mechanism (30) so as to generate friction force when the multi-stage sliding mechanism (40) slides around the support protection mechanism (30).

11. The folding device for a flexible screen according to claim 10, wherein the support protection mechanism (30) or the multi-stage sliding mechanism (40) is provided with a mounting hole, the limiting structure comprises a limiting pin and an elastic member, the limiting pin is slidably inserted into the mounting hole, the elastic member is connected to the bottom of the limiting pin, and the elastic member is compressively disposed in the mounting hole, so that the limiting pin abuts against the multi-stage sliding mechanism (40) or the support protection mechanism (30).

12. Folding device for flexible screens according to any of claims 1-11, characterized in that the supporting protection mechanism (30) comprises a central rotating shaft (31) and two protection pieces (32), the multi-stage sliding mechanism (40) is slidingly connected with the central rotating shaft (31), the central rotating shaft (31) comprises a rotating shaft portion (311) and end plates (314) fixedly connected with the two ends of the rotating shaft portion (311), each protection piece (32) and the corresponding bearing piece (10, 20) are symmetrically arranged on two sides of the rotating shaft portion (311) about the axis of the rotating shaft portion (311), each protection piece (32) comprises a first protection cover (321) and two connecting plates (322), the first protection cover (321) extends along the axial direction of the rotating shaft portion (311), the connecting plates (322) are convexly arranged at the two ends of the first protection cover (321), the two connecting plates (322) are respectively and slidably connected with the corresponding end plates (314) so as to enable the protection pieces (32) to be slidingly connected with the corresponding connecting plates (314) about the axis of the rotating shaft portion (311),

In the unfolded state, the sliding connection mechanism is covered by the first bearing piece (10) and the second bearing piece (20), the protecting pieces (32) are closely adjacent to and respectively positioned inside the corresponding bearing pieces (10, 20),

during the folding process, the two protection pieces (32) are driven by the corresponding bearing pieces (10, 20) to slide around the rotating shaft part (311) and separate, so as to cover the sliding connection mechanism exposed by the rotation of the bearing pieces (10, 20).

13. The folding device for a flexible screen according to claim 12, wherein the central rotating shaft (31) further comprises a second protective cover (312), the second protective cover (312) extends along the length direction of the rotating shaft portion (311), the second protective cover (312) is arranged at intervals with the rotating shaft portion (311), two ends in the length direction are connected with the rotating shaft portion (311) through the end plate (314), the first protective cover (321) is located at one side of the second protective cover (312) away from the rotating shaft portion (311), and in the folded state, the second protective cover (312) is located between the two separated first protective covers (321) so as to jointly form a protective body for covering the exposed sliding connection mechanism.

14. The folding device for flexible screens according to claim 12, characterized in that a guide block (3221) is provided on the inner side of each connecting plate (322) along the length direction of the second protective cover (312) in a protruding manner, two third arc-shaped guide grooves (3141) are provided on each end plate (314), the two third arc-shaped guide grooves (3141) are symmetrically provided with respect to the rotating shaft portion (311) and coaxially provided with the rotating shaft portion (311), and the protective member (32) is slidably engaged with the third arc-shaped guide grooves (3141) on the corresponding side through the guide block (3221).

15. The folding device for the flexible screen according to claim 12, wherein the edge of the first protective cover (321) away from the central rotating shaft (31) protrudes outwards to be provided with a traction bar (3211), the traction bar (3211) extends along the length direction of the first protective cover (321), the first bearing piece (10) and the second bearing piece (20) are both provided with a containing groove (11) for containing the sliding connection mechanism, the bottom of the containing groove (11) protrudes upwards to be provided with a pushing block (12), the pushing block (12) is used for pushing the traction bar (3211) to slide, in the unfolded state, the pushing block (12) and the traction bar (3211) are arranged at intervals along the circumferential direction, and in the folded state, the pushing block (12) is abutted to the traction bar (3211).

16. A mobile terminal comprising a flexible screen and a folding device for a flexible screen according to any of claims 1-15, said flexible screen being fixedly connected to said first carrier (10) and said second carrier (20), respectively.