CN117469262A

CN117469262A - Rotating shaft device, folding shell and electronic equipment

Info

Publication number: CN117469262A
Application number: CN202210847823.2A
Authority: CN
Inventors: 梁林生
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2024-01-30

Abstract

The invention provides a rotating shaft device which comprises a linkage assembly and a limiting assembly, wherein the linkage assembly comprises a first connecting shaft and a connecting rod piece, and the connecting rod piece is connected to the first connecting shaft; the limiting assembly comprises a pushing piece, a pushing piece and an elastic piece, wherein the pushing piece and the pushing piece are sleeved on the first connecting shaft, the pushing piece is detachably connected with the connecting rod piece, the pushing piece is positioned between the connecting rod piece and the pushing piece, and the elastic piece is used for providing elastic force for enabling the pushing piece and the pushing piece to mutually push against each other; when the connecting rod piece rotates around the first connecting shaft, the pushing piece rotates along with the connecting rod piece and rotates relative to the supporting piece, and friction torsion is arranged between the pushing piece and the supporting piece and used for positioning the connecting rod piece. The application also provides a folding shell provided with the rotating shaft device and electronic equipment.

Description

Rotating shaft device, folding shell and electronic equipment

Technical Field

The invention relates to the field of flexible screen support, in particular to a rotating shaft device for supporting a flexible screen, a folding shell provided with the rotating shaft device and electronic equipment provided with the folding shell.

Background

With the development of display devices, a flexible display screen capable of being bent has been developed, so as to design folding electronic devices such as folding mobile phones, folding displays and the like. The bending part of the flexible display screen is generally supported by a hinge mechanism. However, the elements of the existing hinge mechanism for controlling hovering of the foldable electronic device are easily worn away, which not only affects the user's experience of the hovering effect of the foldable electronic device, but also reduces the service life of the hinge mechanism.

Disclosure of Invention

The application provides a rotating shaft device, a folding shell provided with the rotating shaft device and electronic equipment provided with the folding shell.

The application provides a rotating shaft device, which comprises a linkage assembly and a limiting assembly, wherein the linkage assembly comprises a first connecting shaft and a connecting rod piece, and the connecting rod piece is connected to the first connecting shaft; the limiting assembly comprises a pushing piece, a pushing piece and an elastic piece, wherein the pushing piece and the pushing piece are sleeved on the first connecting shaft, the pushing piece is detachably connected with the connecting rod piece, the pushing piece is positioned between the connecting rod piece and the pushing piece, and the elastic piece is used for providing elastic force for enabling the pushing piece and the pushing piece to mutually push against each other; when the connecting rod piece rotates around the first connecting shaft, the pushing piece rotates along with the connecting rod piece and rotates relative to the supporting piece, and friction torsion is arranged between the pushing piece and the supporting piece and used for positioning the connecting rod piece.

The application also provides a folding shell, which comprises two frame bodies and a rotating shaft device, wherein the rotating shaft device is arranged between the two frame bodies.

The application also provides electronic equipment, it includes flexible screen, casing and pivot device, the casing includes two frameworks, the pivot device set up in two between the framework, flexible screen set up in the casing reaches the pivot device, flexible screen is followed pivot device bends or flattens.

The link member and the pushing member of the rotating shaft device are separate elements respectively, and the link member is connected with the pushing member after being made of different materials, so that the wear resistance of the pushing member is larger than that of the link member, the wear resistance of the pushing member is improved, and torsion attenuation of the rotating shaft device is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of an electronic device according to an embodiment of the present application;

FIG. 2 is an exploded perspective view of a folding housing and a flexible screen of the electronic device of FIG. 1;

FIG. 3 is a schematic perspective view of the spindle assembly of FIG. 2;

FIG. 4 is an exploded perspective view of the spindle assembly of FIG. 3;

FIG. 5 is an exploded perspective view of the support mechanism of FIG. 4 from another perspective;

FIG. 6 is a schematic perspective view of the folding mechanism of FIG. 4;

FIG. 7 is an exploded perspective view of the folding mechanism of FIG. 6;

FIG. 8 is an enlarged perspective view of the linkage assembly and spacing assembly of FIG. 7;

FIG. 9 is a schematic perspective view of the linkage assembly and spacing assembly of FIG. 8 from another perspective;

FIG. 10 is an exploded perspective view of the linkage assembly and spacing assembly of FIG. 9;

FIG. 11 is an exploded perspective view of the linkage assembly and stop assembly of FIG. 10 from another perspective;

FIG. 12 is an enlarged view of a part of the structure of one of the link members and the corresponding push member in FIG. 10;

FIG. 13 is an enlarged view of a part of the structure of one of the link members and the corresponding push member in FIG. 11;

FIG. 14 is a schematic end view of one of the pushing members shown in FIG. 10;

FIG. 15 is a partial side elevational view of the link member of FIG. 10;

FIG. 16 is a partial cross-sectional view of the linkage assembly and stop assembly of FIG. 8;

FIG. 17 is another partial cross-sectional view of the linkage assembly and stop assembly of FIG. 8;

FIG. 18 is yet another partial cross-sectional view of the linkage assembly and stop assembly of FIG. 8;

fig. 19 is a schematic perspective view of the electronic device of fig. 1 in a fully folded state;

FIG. 20 is a schematic perspective view of the linkage assembly and spacing assembly of FIG. 19;

fig. 21 is a schematic perspective view of another view of the linkage assembly and spacing assembly of fig. 20.

The main reference numerals illustrate: 100. an electronic device; 30. a flexible screen; 31. a bendable region; 33. a non-bending region; 20. folding the shell; 21. a frame; 50. a spindle device; 51. a folding assisting mechanism; 52. a support mechanism; 521. a middle support hinge; 5210. a first hinge body; 5211. a first back surface; 5212. a first connection region; 5218. a back cover; 523. a side support hinge; 5230. a second hinge body; 5231. a second back surface; 5232. a second connection region; 5233. a first connection portion; 5234. a rotating groove; 5236. a second connecting portion; 5237. an adjustment tank; 5237a, a first positioning segment; 5237b, a second locating section; 53. a rotating assembly; 56. a linkage assembly; 561. a first connecting shaft; 5610. a first middle shaft body; 5612. a first connection section; 562. a link member; 5620. a first sleeve; 5621. positioning the bulge; 5622. a first positioning surface; 5623. a drive gear; 5624. a first shaft hole; 5625. a connecting rod; 5626. a guide rail; 5627. a first limiting surface; 5628. an adjusting shaft; 5629. the second limiting surface; 564. a gear combination; 5642. a linkage gear; 5645. a second shaft hole; 565. a second connecting shaft; 5650. a second middle shaft body; 5652. a second connection section; 5654. a third connecting section; 566. a positioning seat; 5661. a first connection hole; 5663. a second connection hole; 5665. a positioning part; 57. a limit component; 572. a pushing member; 5720. a second sleeve; 5721. a positioning groove; 5722. a first cam; 5723. a second positioning surface; 5724. a first projection; 5725. a first concave portion; 573. a holding member; 5731. a connection part; 5732. a second cam; 5734. a second projection; 5735. a second concave portion; 5736. the first slide guiding hole; 5737. the second slide guiding hole; 574. a fool-proof mechanism; 5742. fool-proof bulges; 5744. fool-proof grooves; 575. an elastic member; 576. a positioning piece; 5762. a first positioning hole; 5764. a second positioning hole; 54. a base; 542. a first base; 544. a second seat body; 55. a rotating frame; 551. a rotating member; 5511. a rotating part; 5515. a connection part; 5516. a lug; 553. a connecting piece; 5530. a guide chute; 5532. a receiving groove; 5536. and rotating the rail.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.

Furthermore, the following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. Directional terms referred to in this application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are merely directions referring to the attached drawings, and thus, directional terms are used for better, more clear description and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "disposed on … …" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Referring to fig. 1 to 4, an electronic device 100 according to an embodiment of the invention includes a foldable housing 20, a hinge device 50, and a flexible screen 30 disposed on the foldable housing 20 and the hinge device 50. The folding housing 20 includes two frames 21, and two opposite sides of the rotating shaft device 50 are respectively connected to the two frames 21. In this embodiment, the flexible screen 30 is disposed on the front surfaces of the two frames 21 and the front surface of the rotating shaft device 50. The flexible screen 30 comprises a bendable region 31 corresponding to the spindle means 50, and two non-bendable regions 33 connected to opposite sides of the bendable region 31. The hinge device 50 is used to support the bendable region 31 of the flexible screen 30, and the flexible screen 30 can be bent or flattened along with the hinge device 50, and the bendable region 31 can be bent to form a U shape or a drop shape or other shapes. In this embodiment, the bendable region 31 can be bent into a drop shape. The rotating shaft device 50 comprises a folding assisting mechanism 51 and a supporting mechanism 52 connected with the folding assisting mechanism 51, the folding assisting mechanism 51 comprises a rotating assembly 53, a linkage assembly 56 and a limiting assembly 57, and the rotating assembly 53 comprises a base 54 and rotating frames 55 rotatably connected to two opposite sides of the base 54; the linkage assembly 56 includes two first connecting shafts 561 rotatably connected to the base 54, and two link members 562, wherein one link member 562 is connected to one first connecting shaft 561, the other link member 562 is connected to the other first connecting shaft 561, and the two link members 562 are slidably connected to the two rotating frames 55, respectively; the limiting component 57 includes a pushing member 572, a pushing member 573, and an elastic member 575, where the pushing member 572 and the pushing member 573 are sleeved on the first connecting shaft 561, the pushing member 572 is located between the connecting rod member 562 and the pushing member 573, the pushing member 572 is detachably connected to the connecting rod member 562, the wear resistance of the pushing member 572 is greater than that of the connecting rod member 562, and the elastic member 575 is used for providing an elastic force that makes the pushing member 573 and the pushing member 572 mutually push against each other. When the turret 55 rotates relative to the base 54, the link members 562 rotate about the corresponding first connection shafts 561, the pushing members 572 rotate with the link members 562 about the corresponding first connection shafts 561, and rotate relative to the pushing members 573, and friction torque is provided between the pushing members 572 and the pushing members 573 for positioning the link members 562, i.e., friction torque between the pushing members 572 and the pushing members 573 positions the link members 562 and the turret 55 relative to the base 54. The folding assisting mechanism 51 is disposed on the back of the supporting mechanism 52, the supporting mechanism 52 is folded or unfolded along with the folding assisting mechanism 51, and the friction torque force between the pushing member 572 and the supporting member 573 can enable the supporting mechanism 52 to be positioned during the folding or unfolding process, so as to enable the two frames 21 to be positioned to a specific angle relative to the base 54, thereby enabling the electronic device 100 to have a hovering effect.

In this embodiment, the front surface refers to the same surface as the light emitting surface of the flexible screen 30, the back surface refers to the surface facing away from the light emitting surface of the flexible screen 30, and the specific angle refers to the range of 0-180 degrees between the front surfaces of the two frames 21. The electronic device 100 is, for example, but not limited to, a mobile phone, a tablet computer, a display, a liquid crystal panel, an OLED panel, a television, a smart watch, a VR head mounted display, a vehicle mounted display, and any other product or component having a display function. "connected" in the description of the embodiments of the present invention is intended to include both direct connection and indirect connection, such as where the a and B connections include direct connection of a and B or other connection through a third element C or more. The connection also comprises two cases of integrated connection and non-integrated connection, wherein the integrated connection means that A and B are integrally formed and connected, and the non-integrated connection means that A and B are non-integrally formed and connected.

In the prior art, a link member and a cam of a torsion module of the hinge adopt an integrally formed structure, and although the structure is simple and easy to process, the space for installing the hinge is further compressed along with the increasing demand of users for lightening and thinning a folding mobile phone, so that the diameter of the cam is smaller, and the diameter of the cam is reduced to cause small matching contact surface and large stress; therefore, under the same torque force, the abrasion of the cam is increased, the torque life is prolonged, the folding hand feeling of the folding mobile phone is affected, and the user experience is greatly reduced; the existing cam and connecting rod piece are generally made of conventional steel materials and are integrally formed, so that the cam is easy to wear; although the connecting rod piece and the cam can adopt materials with higher hardness and higher wear resistance to improve the wear resistance of the cam, the brittleness of the high-hardness materials can lead the connecting rod piece to be easier to break in a drop test, and the reliability is greatly reduced. In the invention, the connecting rod piece 562 and the pushing piece 572 are made of different materials and then are connected, the pushing piece 572 is made of wear-resistant materials, and the connecting rod piece 562 is made of steel with both strength and toughness, so that the wear resistance of the pushing piece 572 is larger than that of the connecting rod piece 562, and the toughness of the connecting rod piece 562 is larger than that of the pushing piece 572, thereby not only improving the wear resistance of the pushing piece 572, but also effectively improving the torsion attenuation of the rotating shaft device 50; and the connecting rod member 562 can be made to have both strength and toughness so as to avoid easier breakage during drop test, and the reliability is greatly improved.

The rotating shaft device 50 of the present invention comprises a supporting mechanism 52 and a folding assisting mechanism 51, wherein the folding assisting mechanism 51 comprises a link member 562, a pushing member 572 connected to the link member 562, a holding member 573 rotatably pushing the pushing member 572, and an elastic member 575; the elastic member 575 provides an elastic force to make the pushing member 572 and the holding member 573 mutually push against each other; when the link member 562 rotates relative to the base 54 along the axis of the first connecting shaft 561, the pushing member 572 rotates with the link member 562 relative to the pushing member 573, so that a friction torque force exists between the pushing member 572 and the pushing member 573, and the friction torque force can position the link member 562 and the rotating frame 55 relative to the base 54, thereby realizing the relative positioning of the two frames 21 to a specific angle. Specifically, during the folding housing 20 bending process, the two rotating frames 55 synchronously rotate relative to the base 54 and draw close to each other, so as to drive the two connecting rod members 562 to synchronously rotate relative to the base 54 and draw close to each other, meanwhile, the connecting rod members 562 slide relative to the corresponding rotating frames 55, at this time, friction torsion between the pushing member 572 and the holding member 573 hinders the connecting rod members 562 from rotating relative to the base 54, so that the rotating frames 55 and the connecting rod members 562 are positioned relative to the base 54, and the two frames 21 are positioned to a specific angle, that is, an included angle between the two frames 21 is 180 degrees to 0 degrees, so as to realize the hovering effect of the electronic device 100. In the unfolding process of the folding housing 20, the two rotating frames 55 synchronously rotate relative to the base 54 and are away from each other, so as to drive the two connecting rod pieces 562 to synchronously rotate relative to the base 54 and to be away from each other, meanwhile, the connecting rod pieces 562 slide relative to the corresponding rotating frames 55, at this time, friction torsion between the pushing piece 572 and the holding piece 573 hinders the connecting rod pieces 562 from rotating relative to the base 54, so that the connecting rod pieces 562 and the rotating frames 55 are positioned relative to the base 54, the two frames 21 are positioned to a specific angle, namely, an included angle between the two frames 21 is a specific angle between 0 degrees and 180 degrees, and a hovering effect of the electronic device 100 is achieved. Therefore, the hinge device 50 can realize multi-angle limitation during bending or flattening, so that the flexible screen 30 attached to the hinge device 50 can realize multi-angle limitation during bending or flattening along with the hinge device 50, and the hinge device is convenient to use and improves user experience. Secondly, in the folding or flattening process of the rotating shaft device 50, the friction torsion is provided between the pushing piece 572 and the pushing piece 573, so that the folding and positioning of the rotating shaft device 50 are firmer, and the electronic equipment 100 has better hovering effect; in addition, because the overall volume of the rotating shaft device 50 is smaller, the rotating shaft device 50 occupies the internal space of the folding housing 20, which is not only beneficial to the layout of other elements such as a main board or a battery in the electronic device 100, but also beneficial to the miniaturization development of the electronic device 100; also, the connection reliability between the components of the hinge device 50 is high, and the flexible screen 30 is prevented from being damaged by the displacement of the components of the electronic apparatus 100 when dropped.

As shown in fig. 2 to 4, in the present embodiment, the number of the folding assisting mechanisms 51 on the back surface of the supporting mechanism 52 is two, specifically, two folding assisting mechanisms 51 are respectively disposed on opposite ends of the back surface of the supporting mechanism 52. The support mechanism 52 includes a middle support hinge 521 and two side support hinges 523 disposed on opposite sides of the middle support hinge 521, wherein the two side support hinges 523 are movably connected to the two rotating frames 55 and the two link members 562, respectively, and the back surface of the flexible screen 30 is attached to the front surfaces of the middle support hinge 521 and the side support hinges 523. Wherein the rotating frame 55 on one side of the base 54 rotates relative to the base 54, and the side supporting hinge 523 on the other side opposite to the base 54 is driven by the linkage assembly 56 to synchronously rotate relative to the base 54, so as to realize the unfolding or bending of the supporting mechanism 52, thereby realizing the folding or unfolding of the rotating shaft device 50. During folding or unfolding of the spindle device 50, both the turret 55 and the link 562 are rotated relative to the base 54, and at the same time, the link 562 slides relative to the corresponding turret 55, and the friction torque between the pushing member 572 and the holding member 573 positions the side support hinge 523 relative to the middle support hinge 521 to relatively position the two frames 21 to a specific angle.

In some embodiments, a folding assisting mechanism 51 is disposed on the back of the supporting mechanism 52, and preferably, the folding assisting mechanism 51 is disposed in the middle of the supporting mechanism 52.

In some embodiments, the rotating shaft device 50 includes three or more folding mechanisms 51, and the three or more folding mechanisms 51 are respectively disposed on the back of the supporting mechanism 52.

As shown in fig. 4 and 5, the middle support hinge 521 includes a first hinge body 5210 having a strip shape and a back cover 5218 connected to a back surface of the first hinge body 5210, the first hinge body 5210 includes a front surface and a first back surface 5211 facing away from the front surface, and the first back surface 5211 of the first hinge body 5210 is provided with a first connection area 5212 for connecting to the front surface of the folding mechanism 51. In this embodiment, the opposite ends of the first back surface 5211 of the first hinge body 5210 are respectively provided with a first connecting area 5212, and the two folding-assisting mechanisms 51 are respectively connected to the two first connecting areas 5212. The back cover 5218 is a bar frame, two opposite ends of the inner surface of the cover 2518 are respectively provided with a connecting portion, and the bases 54 of the two folding-assisting mechanisms 51 are respectively connected to two connecting portions of the cover 2518. Each side support hinge 523 includes a strip-shaped second hinge body 5230 and a second connection region 5232 provided at a second rear surface 5231 of the second hinge body 5230. In this embodiment, the second back surface 5231 of the second hinge body 5230 is provided with two second connecting regions 5232, the two second connecting regions 5232 are respectively located at opposite ends of the second hinge body 5230, and the second connecting regions 5232 are used for connecting the corresponding rotating frame 55 and the connecting rod 562. Each of the second connection regions 5232 includes a pair of first connection portions 5233 and second connection portions 5236 spaced apart from each other, the first connection portions 5233 being disposed on a side away from the middle support hinge 521 and the second connection portions 5236 being disposed on a side closer to the middle support hinge 521. In this embodiment, each second connection portion 5236 is located between a corresponding pair of first connection portions 5233. Each pair of first connecting portions 5233 is provided with a pair of rotating grooves 5234 having a circular arc shape, and axes of the pair of rotating grooves 5234 are collinear. The second connecting portion 5236 is provided with an arc-shaped adjusting groove 5237, and the middle portion of the adjusting groove 5237 is bent to a side away from the second hinge body 5230. The adjusting groove 5237 includes a first positioning segment 5237a and a second positioning segment 5237b at opposite ends thereof, the first positioning segment 5237a being closer to the middle support hinge 521 than the second positioning segment 5237 b.

As shown in fig. 6 and 7, the rotating frame 55 includes a rotating member 551 and a connecting member 553 rotatably connected to the rotating member 551, wherein one end of the rotating member 551 away from the connecting member 553 is rotatably connected to the base 54, and the connecting member 553 is slidably connected to the connecting rod 562. During rotation of the turret 55 and link 562 on the same side of the base 54 relative to the base 54, the link 562 slides relative to the link 553. The rotating frame 55 is slidably connected with the connecting rod 562 through the matching of the sliding guide groove and the sliding guide rail, specifically, the end of the connecting rod 562 away from the base 54 is slidably connected with the end of the connecting piece 553 through the matching of the sliding guide groove and the sliding guide rail, and the sliding guide groove extends along the direction perpendicular to the rotation axis of the rotating piece 551 and the base 54. The guide chute is provided at one of the connection member 553 and the link member 562, and the guide chute is provided at the other one of the connection member 553 and the link member 562. In this embodiment, the connecting piece 553 is provided with a guide chute 553, and the connecting rod 562 is provided with a guide rail 5626 slidably penetrating the guide chute 5530.

The base 54 includes a first base 542 and a second base 544 connected to the first base 542, and an end of the rotating member 551 away from the connecting member 553 is clamped by the first base 542 and the second base 544. Specifically, the first seat 542 and the second seat 544 may be connected by, but not limited to, clamping, screwing, gluing, welding, or the like; in this embodiment, the first seat 542 and the second seat 544 are fixedly connected by a clamping column, the clamping column is disposed on one of the first seat 542 and the second seat 544, and the clamping hole is disposed on the other of the first seat 542 and the second seat 544. The first end of the rotating member 551 is rotatably connected to the base 54, and the second end of the rotating member 551 opposite thereto is rotatably connected to the connecting member 553. Specifically, the rotating member 551 includes a rotating portion 5511 and a connecting portion 5515 connected to the rotating portion 5511, the rotating portion 5511 is disposed at a first end of the rotating member 551, the connecting portion 5515 is disposed at a second end of the rotating member 551, the rotating portion 5511 is rotatably connected to the base 54, and the connecting portion 5515 is rotatably connected to the connecting member 553. Specifically, opposite ends of the side surface of the first seat 542 facing the second seat 544 are rotatably connected to the two rotating portions 5511 through circular arc grooves respectively, the axes of the circular arc grooves are collinear with the axes of rotation between the corresponding rotating member 551 and the base 54, the circular arc grooves are formed in one of the base 54 and the rotating portion 5511, and the circular arc rails are formed in the other of the base 54 and the rotating portion 5511.

In other embodiments, the rotating portion 5511 of the rotating member 551 may be connected to the base 54 through a rotation shaft, so that the rotating member 551 is rotationally connected to the base 54.

The end part of the connecting part 5515 far away from the rotating part 5511 is rotationally connected with the corresponding connecting piece 553 through the switching shaft 556; that is, the connection portion 5515 is rotatably coupled to a first end of the connection member 553, and the link member 562 is slidably coupled to a second end of the connection member 553. Specifically, the connecting portion 5515 has a lug 5516 disposed at an end far from the rotating portion 5511, and the first end of the connecting member 553 has a receiving groove 5532, where the lug 5516 is rotatably received in the receiving groove 5532; the lug 5516 is provided with a first shaft hole in a direction parallel to a rotational axis between the connection portion 5515 and the base 54, and the first end of the connection member 553 is provided with a second shaft hole in a direction parallel to a rotational axis between the connection portion 5515 and the base 54, the second shaft hole communicating with the receiving groove 5532. When the lug 5516 is accommodated in the accommodating groove 5532, the adapter shaft 556 is disposed through the first shaft hole and the second shaft hole, so that the rotating member 551 is rotationally connected with the connecting member 553 through the adapter shaft 556. The guide chute 5530 is disposed at the second end of the connection member 553, and the guide rail 5626 of the link member 562 slidably passes through the corresponding guide chute 5530.

The connection piece 553 is rotatably connected with the corresponding side support hinge 523 by the cooperation of a rotation groove provided in one of the side support hinge 523 and the connection piece 553 and a rotation rail provided in the other of the side support hinge 523 and the connection piece 553. In this embodiment, the opposite ends of the connection member 553 are respectively provided with a rotating rail 5536, each pair of first connection portions 5233 of the side support hinge 523 is provided with a pair of rotating grooves 5234, and the two rotating rails 5536 are respectively rotatably received in the pair of rotating grooves 5234, so that the side support hinge 523 is rotatably connected to the connection member 553.

In other embodiments, the opposite ends of the connection member 553 are respectively provided with a rotating groove, and each pair of first connection portions 5233 of the side support hinge 523 is provided with a pair of rotating rails rotatably received in the rotating grooves, respectively, such that the side support hinge 523 is rotatably connected to the connection member 553.

As shown in fig. 6 to 11, the linkage assembly 56 is located between the limiting assembly 57 and the turret 55, and the pushing member 572 and the link member 562 are detachably connected by the engagement of a positioning protrusion provided on one of the pushing member 572 and the link member 562 and a positioning groove provided on the other of the pushing member 572 and the link member 562. The link member 562 further includes a first sleeve 5620 sleeved on the first connection shaft 561 and a link 5625 connected to an outer circumferential wall of the first sleeve 5620, and the pushing member 572 is detachably connected to one end of the first sleeve 5620 and the pushing member 572 includes a second sleeve 5720 sleeved on the first connection shaft 561. The positioning protrusion is arranged on the end surface of the first sleeve 5620 facing the second sleeve 5720, and the positioning groove is arranged on the end surface of the second sleeve 5720 facing the first sleeve 5620; or the positioning protrusion is arranged on the end surface of the second sleeve 5720 facing the first sleeve 5620, and the positioning groove is arranged on the end surface of the first sleeve 5620 facing the second sleeve 5720. In the present embodiment, the first sleeve 5620 is provided with a plurality of positioning projections 5621 on an end surface facing the pushing member 572; the second sleeve 5720 is provided with a plurality of positioning grooves 5721 at an end surface facing the first sleeve 5620, and the plurality of positioning projections 5621 are engaged with the plurality of positioning grooves 5721 in a one-to-one correspondence, so that the pushing member 572 is detachably connected to the first sleeve 5620. The pushing member 572 may be made of, but not limited to, a wear resistant material such as a wear resistant ceramic, nichrome, tungsten carbide alloy, or alumina, and the link member 562 may be made of, but not limited to, a steel material that combines strength and toughness.

In some embodiments, the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with a plurality of positioning grooves, and the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with a plurality of positioning protrusions, and the positioning protrusions are respectively accommodated in the plurality of positioning grooves, so that the pushing member 572 is detachably connected to the link member 562.

In some embodiments, the first sleeve 5620 and the second sleeve 5720 may be coupled by, but not limited to, welding, clamping, or the like.

As shown in fig. 12 to 15, the plurality of positioning projections 5621 are arranged one turn in the circumferential direction of the first sleeve 5620, the plurality of positioning grooves 5721 are arranged one turn in the circumferential direction of the second sleeve 5720, and the plurality of positioning projections 5621 can be positioned in the plurality of positioning grooves 5721, respectively. Preferably, the plurality of positioning projections 5621 are uniformly spaced one turn in the circumferential direction of the first sleeve 5620, and the plurality of positioning recesses 5721 are uniformly spaced one turn in the circumferential direction of the second sleeve 5720. In this embodiment, the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with three positioning grooves 5721, and the three positioning grooves 5721 are uniformly arranged at intervals along the circumferential direction of the second sleeve 5720 for one circle, that is, the included angle a between two adjacent positioning grooves 5721 in the circumferential direction of the second sleeve 5720 is 120 degrees; the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with three positioning protrusions 5621, and the three positioning protrusions 5621 are uniformly arranged at intervals in one circle along the circumferential direction of the first sleeve 5620, that is, the included angle B between two adjacent positioning protrusions 5621 in the circumferential direction of the first sleeve 5620 is 120 degrees; the three positioning projections 5621 can be positioned in the three positioning grooves 5721, respectively.

In some embodiments, the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with at least one positioning protrusion 5621, the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with at least one positioning groove 5721, and the positioning protrusion 5621 is positionable in the positioning groove 5721; or the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with at least one positioning groove, and the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with at least one positioning protrusion, which can be positioned in the positioning groove.

In some embodiments, the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with two positioning protrusions 5621, the two positioning protrusions 5621 are symmetrical about the axis of the first sleeve 5620, that is, the included angle B of the two positioning protrusions 5621 in the circumferential direction of the second sleeve 5720 is 180 degrees, the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with two positioning grooves 5721, the two positioning grooves 5721 are symmetrical about the axis of the second sleeve 5720, that is, the included angle a of the two positioning grooves 5721 in the circumferential direction of the second sleeve 5720 is 180 degrees, and the two positioning protrusions 5621 are positioned in the two positioning grooves 5721 respectively; or the end face of the first sleeve 5620 facing the second sleeve 5720 is provided with two positioning grooves, the two positioning grooves are symmetrical about the axial lead of the first sleeve 5620, namely, the included angle of the two positioning grooves in the circumferential direction of the first sleeve 5620 is 180 degrees, the end face of the second sleeve 5720 facing the first sleeve 5620 is provided with two positioning protrusions, the two positioning protrusions are symmetrical about the axial lead of the second sleeve 5720, the included angle of the two positioning protrusions in the circumferential direction of the second sleeve 5720 is 180 degrees, and the two positioning protrusions are respectively positioned in the two positioning grooves.

In some embodiments, the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with more than three positioning protrusions 5621, i.e. the number of positioning protrusions 5621 is N, where N is greater than 3, and the more than three positioning protrusions 5621 are uniformly arranged at intervals along the circumferential direction of the first sleeve 5620, and the included angle B between each two adjacent positioning protrusions 5621 in the circumferential direction of the first sleeve 5620 is equal to 360 degrees divided by N, i.e. b=360/N; the end face of the second sleeve 5720 facing the first sleeve 5620 is provided with more than three positioning grooves 5721, namely, the number of the positioning grooves 5721 is N, wherein N is greater than 3, the more than three positioning grooves 5721 are uniformly arranged at intervals along the circumferential direction of the second sleeve 5720, and an included angle a between every two adjacent positioning grooves 5721 in the circumferential direction of the second sleeve 5720 is equal to 360 degrees divided by N, namely, a=360/N; each positioning projection 5621 can be positioned in a corresponding positioning groove 5721.

In some embodiments, the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with more than three positioning grooves, i.e. the number of positioning grooves is N, where N is greater than 3, and the more than three positioning grooves are uniformly spaced apart by one along the circumferential direction of the first sleeve 5620, and an included angle between each two adjacent positioning grooves in the circumferential direction of the first sleeve 5620 is equal to 360 degrees divided by N; the end face of the second sleeve 5720 facing the first sleeve 5620 is provided with more than three positioning protrusions, namely, the number of the positioning protrusions is N, wherein N is greater than 3, the more than three positioning protrusions are uniformly arranged at intervals along the circumferential direction of the second sleeve 5720, and the included angle between every two adjacent positioning protrusions in the circumferential direction of the second sleeve 5720 is equal to 360 degrees divided by N; each positioning projection 5621 can be positioned in a corresponding positioning groove 5721.

The positioning projection 5621 may be, but is not limited to, a rectangular block, a sector block, or the like, and the positioning groove 5721 may be, but is not limited to, a rectangular groove, a sector groove, or the like, corresponding to the positioning projection 5621. In this embodiment, the positioning protrusion 5621 is a sector, the arc length of the positioning protrusion 5621 near the outer peripheral surface of the first sleeve 5620 is greater than the arc length of the positioning protrusion 5621 near the inner peripheral surface of the first sleeve 5620, and the positioning protrusion 5621 includes two opposite first positioning surfaces 5622; the positioning groove 5721 is a fan-shaped groove, the positioning groove 5721 is communicated with the inner cavity of the second sleeve 5720 along the radial direction of the second sleeve 5720, the width of an opening at the intersection of the positioning groove 5721 and the outer peripheral surface of the second sleeve 5720 is larger than the width of an opening at the intersection of the positioning groove 5721 and the inner peripheral surface of the second sleeve 5720, and the positioning groove 5721 comprises two opposite second positioning surfaces 5723; when the positioning protrusion 5621 is accommodated in the positioning groove 5721, the two first positioning surfaces 5622 respectively abut against the two second positioning surfaces 5723. The positioning protrusion 5621 and the positioning groove 5721 are both fan-shaped, and the positioning protrusion 5621 and the positioning groove 5721 are matched stably, so that the connection between the pushing member 572 and the link member 562 is firm, and the pushing member 572 can be prevented from being separated from the link member 562.

In some embodiments, the positioning protrusion at the end of the first sleeve 5620 is a segment, the arc length of the positioning protrusion near the outer peripheral surface of the first sleeve 5620 is smaller than the arc length of the positioning protrusion 5621 near the inner peripheral surface of the first sleeve 5620, and the positioning protrusion includes two opposite first positioning surfaces; the positioning groove at the end part of the second sleeve 5720 is a fan-shaped groove, the positioning groove is communicated with the inner cavity of the second sleeve 5720 along the radial direction of the second sleeve 5720, the width of an opening at the intersection of the positioning groove 5721 and the outer peripheral surface of the second sleeve 5720 is smaller than the width of an opening at the intersection of the positioning groove 5721 and the inner peripheral surface of the second sleeve 5720, and the positioning groove comprises two opposite second positioning surfaces; when the positioning protrusion is positioned in the positioning groove, the two first positioning surfaces respectively abut against the two second positioning surfaces.

As shown in fig. 10-13, the second sleeve 5720 further includes a first cam 5722 sleeved on the first connecting shaft 561, where the first cam 5722 is disposed at an end of the second sleeve 5720 facing away from the positioning groove 5721; the abutting member 573 includes a second cam 5732 sleeved on the first connecting shaft 561, the first cam 5722 and the second cam 5732 are abutted against each other in a rotating manner, the first sleeve 5620 and the second sleeve 5720 are coaxial, and friction torque between the first cam 5722 and the second cam 5732 can enable the connecting rod member 562 to be positioned relative to the limiting component 57. The outer diameter of the first sleeve 5620 may be the same as or different from the outer diameter of the second sleeve 5720, in this embodiment, the outer diameter of the first sleeve 5620 is equal to the outer diameter of the second sleeve 5720. When the first cam 5722 rotates relative to the second cam 5732, the first cam 5722 rotationally pushes the second cam 5732 to slide along the axial direction of the first connection shaft 561 away from or close to the first cam 5722, the elastic member 575 is pressed, and the friction torque between the pushing member 572 and the abutting member 573 can position the link member 562 relative to the turret 55; specifically, frictional torque between first cam 5722 and second cam 5732 can limit link 562 to a particular angle relative to abutment 573. In this embodiment, the first sleeve 5620 of each link 562 is connected with a pushing member 572, two first cams 5722 are respectively sleeved on two first connecting shafts 561, the elastic member 575 pushes the pushing member 573, and the second cam 5732 pushes the first cams 5722, so that the connection between the pushing member 572 and the link 562 is firmer. The first cam 5722 is provided with a first protruding portion 5724 and a first recessed portion 5725 along a circumferential direction thereof, specifically, the first cam 5722 includes a concave-convex surface disposed at one end of the second sleeve 5720, the concave-convex surface includes the first protruding portion 5724 and the first recessed portion 5725, and the first protruding portion 5724 and the first recessed portion 5725 are sequentially arranged at intervals along the circumferential direction of the first cam 5722. The number of the first protruding portions 5724 and the number of the first recessed portions 5725 may be set as required, for example, the first cam 5722 may include one first protruding portion 5724 and one first recessed portion 5725, two first protruding portions 5724 and two first recessed portions 5725, three first protruding portions 5724 and three first recessed portions 5725, or four first protruding portions 5724 and four first recessed portions 5725.

The number of the first recesses 5725 may be the same as or different from the number of the positioning recesses 5721, the plurality of positioning recesses 5721 are arranged along the circumferential direction of the second sleeve 5720, the plurality of first recesses 5725 are arranged along the circumferential direction of the second sleeve 5720, and the plurality of positioning recesses 5721 are aligned with the plurality of first recesses 5725, respectively, in the axial direction of the second sleeve 5720. Preferably, the plurality of positioning grooves 5721 at one end of the second sleeve 5720 are arranged in a circle along the circumferential direction of the second sleeve 5720, the plurality of first concave portions 5725 at the opposite end of the second sleeve 5720 are arranged in a circle along the circumferential direction of the second sleeve 5720, and the plurality of positioning grooves 5721 are aligned with the plurality of first concave portions 5725 in the axial direction of the second sleeve 5720, that is, the plurality of positioning grooves 5721 are aligned with the plurality of first concave portions 5725 in the axial direction of the second sleeve 5720. In this embodiment, one end of the second sleeve 5720 is provided with three positioning grooves 5721, the three positioning grooves 5721 are uniformly spaced and arranged in a circle along the circumferential direction of the second sleeve 5720, the opposite end of the second sleeve 5720 is provided with three first concave portions 5725, the three first concave portions 5725 are uniformly spaced and arranged along the circumferential direction of the second sleeve 5720, and the three positioning grooves 5721 and the three first concave portions 5725 are aligned in the axial direction of the second sleeve 5720 respectively, that is, the three positioning grooves 5721 and the three first concave portions 5725 are opposite to each other in the axial direction of the second sleeve 5720.

As shown in fig. 12-15, a fool-proof mechanism 574 is disposed between the pushing member 572 and the connecting rod member 562, the fool-proof mechanism 574 includes a fool-proof protrusion 5742 and a fool-proof groove 5744, the fool-proof protrusion 5742 is disposed on one of the pushing member 572 and the connecting rod member 562, the fool-proof groove 5744 is disposed on the other one of the pushing member 572 and the connecting rod member 562, and the fool-proof protrusion 5742 is cooperatively positioned with the fool-proof groove 5744 to prevent erroneous installation of the pushing member 572 and the connecting rod member 562. In this embodiment, the link member 562 is provided with a fool-proof protrusion 5742, and the pushing member 572 is provided with a fool-proof recess 5744, and when the positioning protrusion 5621 is positioned in the positioning recess 5721, the fool-proof protrusion 5742 is accommodated in the fool-proof recess 5744. Specifically, the end surface of the first sleeve 5620 facing the second sleeve 5720 is provided with a fool-proof protrusion 5742, the fool-proof protrusion 5742 is located between two adjacent positioning protrusions 5621, the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with a fool-proof groove 5744, and the fool-proof groove 5744 is located between two adjacent positioning grooves 5721. In this embodiment, a fool-proof protrusion 5742 is disposed between two adjacent positioning protrusions 5621 on the end surface of the first sleeve 5620 facing the second sleeve 5720, and a fool-proof groove 5744 is disposed between two adjacent positioning grooves 5721 on the end surface of the second sleeve 5720 facing the first sleeve 5620, and when the positioning protrusions 5621 are positioned in the positioning grooves 5721, the fool-proof protrusion 5742 is accommodated in the corresponding fool-proof groove 5744. The middle part of the pushing member 572 is provided with a third axial hole 5726 along the axial direction thereof.

In some embodiments, a fool-proof protrusion 5742 is disposed between each two adjacent positioning protrusions 5621 on the end surface of the first sleeve 5620 facing the second sleeve 5720, a fool-proof groove 5744 is disposed between each two adjacent positioning grooves 5721 on the end surface of the second sleeve 5720 facing the first sleeve 5620, and each fool-proof protrusion 5742 is accommodated in the corresponding fool-proof groove 5744 when the positioning protrusions 5621 are positioned in the positioning grooves 5721.

In some embodiments, link 562 is provided with a fool-proof recess 5744 and pusher 572 is provided with a fool-proof protrusion 5742, wherein fool-proof protrusion 5742 is received in fool-proof recess 5744 when positioning protrusion 5621 is positioned in positioning recess 5721. Specifically, the positioning protrusion 5621 of the first sleeve 5620 is provided with a fool-proof groove 5744, the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with a fool-proof protrusion 5742, and the fool-proof protrusion 5742 is located in the positioning groove 5721; when the positioning projection 5621 is mated with the positioning groove 5721, the fool-proof projection 5742 is positioned in the fool-proof groove 5744. Preferably, each positioning protrusion 5621 of the first sleeve 5620 is provided with a fool-proof groove 5744 facing an end surface of the second sleeve 5720, the second sleeve 5720 is provided with a fool-proof protrusion 5742 in at least one positioning groove 5721 facing the end surface of the first sleeve 5620, and the fool-proof protrusions 5742 are positioned in the corresponding fool-proof grooves 5744 when the positioning protrusions 5621 are mated with the positioning grooves 5721.

In some embodiments, each positioning protrusion 5621 of the first sleeve 5620 is provided with a fool-proof groove 5744 facing an end surface of the second sleeve 5720, the end surface of the second sleeve 5720 facing the first sleeve 5620 is provided with a fool-proof protrusion 5742 in each positioning groove 5721, and each fool-proof protrusion 5742 is positioned in a corresponding fool-proof groove 5744 when the positioning protrusion 5621 is mated with the positioning groove 5721.

As shown in fig. 8-11, linkage assembly 56 further includes a gear assembly 564 disposed between two link members 562, gear assembly 564 including intermeshing linkage gears 5642, each link member 562 being provided with a drive gear 5623 that meshes with a corresponding linkage gear 5642. The driving gear 5623 is disposed on the outer peripheral wall of the first sleeve 5620, specifically, the driving gear 5623 is disposed on a side of the first sleeve 5620 facing away from the connecting rod 5625, and an axis of the driving gear 5623 is collinear with an axis of the first sleeve 5620. In this embodiment, the teeth of the driving gear 5623 are arranged in the circumferential direction of the first sleeve 5620 at a rotation angle of between 90 degrees and 180 degrees, that is, the driving gear 5623 is disposed on the outer circumferential wall of one quarter to one half of the first sleeve 5620. Preferably, the outer diameter of the pitch circle of the drive gear 5623 is greater than the outer diameter of the first cam 5722. The positioning boss 5621 is provided at an end of the first sleeve 5620 remote from the driving gear 5623. The first sleeve 5620 is provided with a first shaft hole 5624 along an axial direction thereof, and the first coupling shaft 561 can rotate the first sleeve 5620 around the first coupling shaft 561 after being inserted into the first shaft hole 5624 of the first sleeve 5620. Guide rails 5626 are respectively protruded on two opposite sides of the connecting rod 5625, and the guide rails 5626 extend along the length direction of the connecting rod 5625.

As shown in fig. 5 and 10-11, the link member 562 is movably coupled to the corresponding side support hinge 523 by a coupling of an adjustment groove with an adjustment shaft having an axis parallel to an axis direction of the first coupling shaft 561; the adjustment groove is provided to one of the side support hinge 523 and the link 562, and the adjustment shaft is provided to the other of the side support hinge 523 and the link 562. In this embodiment, the side support hinge 523 is provided with an adjustment groove 5237, and an end of the link 5625 remote from the first sleeve 5620 is provided with an adjustment shaft 5628, and the adjustment shaft 5628 is rotatably and slidably inserted into the adjustment groove 5237.

The linkage assembly 56 further includes second connecting shafts 565 spaced apart in parallel, each of the linkage gears 5642 is sleeved on the corresponding second connecting shaft 565, the second connecting shaft 565 is located between the two first connecting shafts 561, and an axis of the second connecting shaft 565 is parallel to an axis of the first connecting shaft 561. Specifically, the middle portion of the linkage gear 5642 is provided with a second shaft hole 5645 along the axial direction thereof, and each second connection shaft 565 is disposed in the corresponding second shaft hole 5645, and the linkage gear 5642 can rotate around the corresponding second connection shaft 565. In this embodiment, the linkage assembly 56 includes two linkage gears 5642 and two second connecting shafts 565, and the two linkage gears 5642 are engaged with each other and then sleeved on the two second connecting shafts 565, and the driving gears 5623 of the two link members 562 are engaged with the two linkage gears 5642. Preferably, the outer diameter of the pitch circle of the linkage gear 5642 is smaller than the diameter of the pitch circle of the driving gear 5623, and the number of teeth of the linkage gear 5642 surrounding one circle is smaller than the number of teeth of the driving gear 5623 surrounding one circle. Under the certain width and height space of the first connecting shafts 561, the outer diameter of the reference circle of the driving gear 5623 is increased through the two linkage gears 5642 arranged between the two first connecting shafts 561, so that the outer diameter of the first cam 5722 can be increased, larger friction torsion can be provided between the first cam 5722 and the second cam 5732, fatigue abrasion of the first cam 5722 can be reduced, and the service life of the first cam 5722 is prolonged.

As shown in fig. 10 and 11, the supporting member 573 includes a connecting portion 5731 and two second cams 5732, the two second cams 5732 are respectively disposed at two opposite ends of the connecting portion 5731, and the two second cams 5732 are respectively slidably sleeved on the two first connecting shafts 561. Specifically, the second cam 5732 includes a circular sleeve and a concave-convex surface disposed at one end of the sleeve, where the concave-convex surface includes a second protruding portion 5734 and a second recessed portion 5735, and the second protruding portion 5734 and the second recessed portion 5735 are sequentially arranged at intervals along the circumferential direction of the sleeve. The number of second protruding portions 5734 and the number of second recessed portions 5735 on the second cam 5732 are identical to the number of first recessed portions 5725 and the number of first protruding portions 5724 on the first cam 5722, so that the first protruding portions 5724 are engaged with the second recessed portions 5735, and the second protruding portions 5734 are engaged with the first recessed portions 5725. The supporting member 573 is provided with a first guiding and sliding hole 5736 and a second guiding and sliding hole 5737 which are parallel at intervals, the middle part of each second cam 5732 is provided with the first guiding and sliding hole 5736 along the axial direction of the second cam 5732, the connecting part 5731 is provided with two second guiding and sliding holes 5737 which are spaced, and the axial line of the second guiding and sliding holes 5737 is parallel to the axial line of the second cam 5732. The two first connecting shafts 561 are respectively inserted into the two first sliding guide holes 5736 of the supporting member 573, and the two second connecting shafts 565 are respectively inserted into the two second sliding guide holes 5737 of the supporting member 573.

As shown in fig. 10 and 11, the first connecting shaft 561 includes a first middle shaft body 5610 and first connecting sections 5612 located at opposite ends of the first middle shaft body 5610, the outer diameter of the first middle shaft body 5610 is larger than the outer diameter of the first connecting section 5612, the outer diameter of the first connecting section 5612 is not larger than the diameter of the first sliding guiding hole 5736 of the abutting piece 573, the diameter of the first shaft hole 5624 of the first sleeve 5620 and the inner diameter of the second sleeve 5720, and the outer diameter of the first middle shaft body 5610 is larger than the diameter of the first sliding guiding hole 5736. The second connecting shaft 565 includes a second middle shaft body 5650, second connecting sections 5652 positioned at opposite ends of the second middle shaft body 5650, and third connecting sections 5654 positioned at opposite ends of the second connecting shaft 565, the outer diameter of the second middle shaft body 5650, the outer diameter of the second connecting sections 5652, and the outer diameter of the third connecting sections 5654 gradually decreasing; the outer diameter of the second connecting section 5652 is not greater than the diameter of the second sliding guiding hole 5737 of the abutting member 573, the outer diameter of the third connecting section 5654 is not greater than the diameter of the second shaft hole 5645 of the linkage gear 5642, the outer diameter of the second middle shaft body 5650 is greater than the diameter of the second sliding guiding hole 5737, and the outer diameter of the second connecting section 5652 is greater than the diameter of the second shaft hole 5645.

The linkage assembly 56 further includes a positioning seat 566, the same ends of the first connecting shaft 561 and the second connecting shaft 565 are respectively connected to the positioning seat 566, and one end of the positioning seat 566 facing away from the first connecting shaft 561 is connected to the base 54. Specifically, the side surface of the positioning seat 566 facing the link member 562 is provided with two first connection holes 5661 and two second connection holes 5663, the two first connection holes 5661 being located at opposite ends of the side surface, and the two second connection holes 5663 being located between the two first connection holes 5661. The two first connection shafts 561 are inserted into the two first connection holes 5661, respectively, and the two second connection shafts 565 are inserted into the two second connection holes 5663, respectively. One side of the positioning seat 566 facing the link member 562 is provided with a positioning portion 5665, the link member 562 includes a first limiting surface 5627 and a second limiting surface 5629, and when the two link members 562 are in a folded state relative to the base 54, the positioning portion 5665 abuts against the first limiting surface 5627; when the two link members 562 are in the flattened state with respect to the base 54, the positioning portion 5665 abuts against the second limiting surface 5629. Specifically, one end of the first sleeve 5620 facing away from the positioning protrusion 5621 is provided with a notch around the first shaft hole 5624, the first limiting surface 5627 and the second limiting surface 5629 are two opposite end surfaces of the notch, and the first limiting surface 5627 is farther away from the guide rail 5626 than the second limiting surface 5629; the opposite ends of the side surface of the positioning seat 566 facing the link member 562 are respectively provided with a positioning portion 5665, and each positioning portion 5665 is a positioning block.

As shown in fig. 10 and 11, the limiting assembly 57 further includes a positioning member 576, one ends of the first connecting shaft 561 and the second connecting shaft 565 away from the positioning seat 566 are respectively connected to the positioning member 576, the elastic member 575 is sleeved on the first connecting shaft 561, and the elastic member 575 is clamped by the positioning member 576 and the supporting member 573. Specifically, the side surface of the positioning member 576 facing the positioning seat 566 is provided with a first positioning hole 5762 and a second positioning hole 5764, and the ends of the first connecting shaft 561 and the second connecting shaft 565 away from the positioning seat 566 are respectively positioned in the first positioning hole 5762 and the second positioning hole 5764. Specifically, the opposite ends of the side surface of the positioning member 576 facing the positioning seat 566 are respectively provided with a first positioning hole 5762 and two second positioning holes 5764 located between the two first positioning holes 5762.

In this embodiment, the elastic member 575 includes a spring sleeved on each first connecting shaft 561. In other embodiments, the second connecting shaft 565 is also sleeved with an elastic member, and opposite ends of the elastic member respectively abut against the positioning member 576 and the abutting member 573.

Referring to fig. 8-18, when assembling the linkage assembly 56 and the limiting assembly 57, one end of the two first connecting shafts 561 is inserted into the two first sliding guide holes 5736 of the supporting member 573 from the side facing away from the second cam 5732, and one end of the two second connecting shafts 565 is inserted into the two second sliding guide holes 5737 of the supporting member 573 from the side facing away from the second cam 5732, so that the supporting member 573 is slidably sleeved on the first connecting section 5612 of the two first connecting shafts 561 and the second connecting section 5652 of the two second connecting shafts 565; the positioning projections 5621 of the two link members 562 are respectively inserted into the corresponding positioning grooves 5721 of the two pushing members 572, and the fool-proof projections 5742 are positioned in the corresponding fool-proof grooves 5744; the gear combination 564 is disposed between the two link members 562, and the two linked gears 5642 respectively engage the two driving gears 5623; the ends of the two first connecting shafts 561 are sleeved with the third shaft holes 5726 provided with the abutting pieces 573 and inserted into the two abutting pieces 572 respectively and the first shaft holes 5624 of the two connecting rods 562, meanwhile, the ends of the two second connecting shafts 565 are sleeved with the abutting pieces 573 and inserted into the second shaft holes 5645 of the two linkage gears 5642 respectively, so that the first cams 5722 of the two abutting pieces 572 are meshed with the two second cams 5732 of the abutting pieces 573 respectively in a mutually rotatable way, and the two linkage gears 5642 are sleeved on the third connecting sections 5654 of the two second connecting shafts 565; the positioning seat 566 is connected to the ends of the first connecting shaft 561 and the second connecting shaft 565 sleeved with the supporting member 573, specifically, the first connecting sections 5612 of the two first connecting shafts 561 and the third connecting sections 5654 of the two second connecting shafts 565 are respectively inserted into the two first connecting holes 5661 and the two second connecting holes 5663 of the positioning seat 566, and the two positioning portions 5665 of the positioning seat 566 are respectively accommodated in the notches of the two connecting rod members 562; the two elastic members 575 are respectively sleeved on the first middle shaft bodies 5610 of the two first connecting shafts 561; the positioning member 576 is positioned at one end of the two first connecting shafts 561 and the second connecting shaft 565 away from the positioning seat 566, and the elastic member 575 is clamped by the positioning member 576 and the abutting member 573. At this time, the elastic member 575 is in a pressed state, that is, the elastic member 575 has a pre-elastic force, the elastic member 575 elastically pushes the pushing member 573, the pushing member 573 pushes the two pushing members 572, so that the connection between the pushing members 572 and the connecting rod member 562 is firmer, the pushing members 572 are prevented from being separated from the connecting rod member 562, and the pushing members 572 and the connecting rod member 562 do not need to be additionally welded and fixed, so that the assembly is simple and convenient; if the elastic member 575 has a pre-elastic force F0, each first cam 5722 can be rotatably abutted against the corresponding second cam 5732, i.e. the first protruding portion 5724 is accommodated in the second recessed portion 5735, the second protruding portion 5734 is accommodated in the first recessed portion 5725, and the axial force F of the first cam 5722 and the second cam on each first connecting shaft 561 is equal to the pre-elastic force F0 of the elastic member 575, i.e. f=f0.

When the linkage assembly 56 is folded from the fully flattened state, one of the link members 562 is folded toward the other link member 562 relative to the abutting member 573, and the one link member 562 rotates about the corresponding first connecting shaft 561 to drive the corresponding abutting member 572 and the driving gear 5623 to rotate about the corresponding first connecting shaft 561; the rotating driving gear 5623 drives the other driving gear 5623 to rotate through the gear combination 564, and the rotation of the other driving gear 5623 drives the corresponding first sleeve 5620, the pushing piece 572 and the connecting rod 5625 to rotate around the corresponding first connecting shaft 561, so that the two connecting rod pieces 562 of the linkage assembly 56 synchronously draw together; at the same time, the pushing member 572 rotates relative to the pushing member 573 to rotationally push the first cam 5722 against the second cam 5732, so that the pushing member 573 slides along the axial direction of the first connection shaft 561 to press the elastic member 575, and the elastic member 575 is elastically clamped between the positioning member 576 and the pushing member 573.

In the above process, the axial force of the first cam 5722 and the second cam 5732 on each first connection shaft 561 is equal to the elastic force of the elastic member 575; the frictional torque between the first cam 5722 and the second cam 5732 enables the two link members 562 to be limited to a specific angle between 180 degrees and 0 degrees. When the included angle between the two link members 562 is 180 degrees, the linkage assembly 56 is in a completely flattened state, and the two positioning portions 5665 respectively abut against the second limiting surfaces 5629 of the two link members 562; when the included angle between the two link members 562 is 0 degrees, the linkage assembly 56 is in a completely bent state, and the two positioning portions 5665 respectively abut against the first limiting surfaces 5627 of the two link members 562. The friction torque between the first cam 5722 and the second cam 5732 on each first connection shaft 561 corresponds to the torque M1, and then the total friction torque m=m1 on each first connection shaft 561.

In other usage modes, the two link members 562 can be rotated together in opposite directions, and each link member 562 rotates around the corresponding first connecting shaft 561 to drive the corresponding driving gear 5623 and the pushing member 572 to rotate around the first connecting shaft 561; the two driving gears 5623 together drive the two linkage gears 5642 of the gear assembly 564 to rotate, so that the two link members 562 of the linkage assembly 56 synchronously draw together; at the same time, each pushing member 572 rotates relative to the pushing member 573, so that the first cam 5722 of the pushing member 572 rotationally pushes the second cam, the pushing member 573 slides away from the link member 562 along the axial direction of the first connecting shaft 561 to press the elastic member 575, and the elastic member 575 elastically pushes against between the positioning member 576 and the pushing member 573.

When the linkage assembly 56 is unfolded from the fully folded state, one of the link members 562 is unfolded away from the other link member 562 relative to the abutting member 573, and the one link member 562 rotates around the corresponding first connecting shaft 561 to drive the corresponding driving gear 5623 and the abutting member 572 to rotate around the corresponding first connecting shaft 561, the rotating driving gear 5623 drives the other driving gear 5623 to rotate through the gear assembly 564, and the rotation of the other driving gear 5623 drives the corresponding first sleeve 5620, the abutting member 572 and the connecting rod 5625 to rotate around the corresponding first connecting shaft 561, so that the two link members 562 of the linkage assembly 56 are synchronously separated from each other; simultaneously, the pushing member 572 rotates relative to the pushing member 573, so that the first cam 5722 of the pushing member 572 rotationally pushes the second cam 5732, and the pushing member 573 slides along the axial direction of the first connecting shaft 561 to press the elastic member 575, so that the elastic member 575 is elastically clamped between the positioning member 576 and the pushing member 573.

In the above process, the axial force of the first cam 5722 and the second cam 5732 on each first connection shaft 561 is equal to the elastic force of the elastic member 575; the frictional torque between the first cam 5722 and the second cam 5732 enables the two link members 562 to be limited to a specific angle between 0 degrees and 180 degrees.

In other usage modes, the two link members 562 can be rotated together in a direction away from each other, and each link member 562 rotates around the corresponding first connecting shaft 561 to drive the corresponding driving gear 5623 and the pushing member 572 to rotate around the first connecting shaft 561; the two driving gears 5623 together drive the two linkage gears 5642 of the gear assembly 564 to rotate, so that the two link members 562 of the linkage assembly 56 are far away from each other to be flattened; simultaneously, the pushing member 572 rotates relative to the pushing member 573, so that the first cam 5722 of the pushing member 572 rotationally pushes the second cam 5732, and the pushing member 573 slides along the axial direction of the first connecting shaft 561 to press the elastic member 575, so that the elastic member 575 is elastically clamped between the positioning member 576 and the pushing member 573.

As shown in fig. 6 and 7, when the folding assisting mechanism 51 is assembled, the linkage assembly 56 and the limiting assembly 57 are combined and then placed between the two connecting pieces 553, the guide rails 5626 of the two connecting pieces 562 are respectively slidably inserted into the guide grooves 553 of the two connecting pieces 553, and the positioning seat 566 is fixedly connected to the base 54. As shown in fig. 3-6, when assembling the folding-assisting mechanism 51 to the supporting mechanism 52, two side supporting hinges 523 are placed on opposite sides of the base 54, two rotating rails 5536 of each connecting piece 553 are respectively rotatably accommodated in a pair of rotating grooves 5234 of the corresponding side supporting hinge 523, and an adjusting shaft 5628 of the connecting piece 562 is inserted into the corresponding adjusting groove 5237; the first hinge body 5210 is placed on the base 54 such that the first hinge body 5210 is positioned between the two side support hinges 523 and such that the two first connection regions 5212 are respectively connected to the two folding-assisting mechanisms 51. The back cover 5218 is then attached to the back of the base 54. The rotational axis between the rotational piece 551 and the base 54 is parallel to the axis of the first connection shaft 561, and the rotational axis between the rotational piece 551 and the connection piece 553 is parallel to the axis of the first connection shaft 561. When the two side support hinges 523 are in the completely flattened state, the adjusting shafts 5628 are positioned at the second positioning sections 5237b of the corresponding adjusting slots 5237, and the positioning portions 5665 abut against the second limiting surfaces, so that the rotating shaft device 50 maintains the completely flattened state, and the front surfaces of the two side support hinges 523 and the front surface of the middle support hinge 521 are coplanar, so as to prevent the side support hinge 523 from being bent back relative to the middle support hinge 521. When the two side support hinges 523 are in a completely bent state, the adjusting shafts 5628 are positioned at the first positioning sections 5237a of the corresponding adjusting slots 5237, and the positioning portions 5665 abut against the first limiting surfaces, so that the rotating shaft device 50 maintains the completely bent state, the front surfaces of the two side support hinges 523 and the front surface of the middle support hinge 521 enclose a water drop shape, and the side support hinge 523 is prevented from being further bent relative to the middle support hinge 521.

As shown in fig. 1 to 3, the installed shaft device 50 is placed between two frames 21, and the connection parts 553 on opposite sides of the shaft device 50 are fixedly connected to the two frames 21, respectively. At this time, the front faces of the two frames 21, the front faces of the middle support hinge 521, and the front faces of the two side support hinges 523 are coplanar. The back of the flexible screen 30 is connected to the front of the two frames 21 and the front of the rotating shaft device 50, the bendable region 31 faces the rotating shaft device 50, and the two non-bendable regions 33 respectively face the front of the two frames 21. When the flexible screen 30 is in the flattened state, the elastic member 575 provides a pre-elastic force to push the supporting member 573, so that the first cam 5722 and the second cam 5732 are mutually jointed to define that the supporting mechanism 52 is kept in the flattened state. Because the front of the middle support hinge 521 is a complete surface, the middle support hinge 521 has no step, so that the flexible screen 30 cannot be impacted by the step when being flattened, the flexible screen 30 cannot have the adverse problems of color spots, bright spots and the like, the reliability of the flexible screen 30 is ensured, meanwhile, the touch handfeel of the flexible screen 30 is also improved, and the user experience is improved.

Referring to fig. 1-4 and fig. 19-21, when the electronic device 100 is folded, a folding force is applied to at least one of the two frames 21 of the electronic device 100, so that the rotating frames 55 connected to the two frames 21 rotate in directions approaching each other, the folding of the rotating shaft device 50 is achieved through the two folding-assisting mechanisms, and the bendable region 31 of the flexible screen 30 is folded along with the supporting mechanism 52. Specifically, if a bending force is applied to one of the frames 21, the one of the frames 21 drives the corresponding rotating frame 55 to rotate toward the side close to the flexible screen 30 relative to the base 54; to drive the corresponding link member 562 to rotate around the first connection shaft 561 towards the side close to the flexible screen 30 relative to the base 54, meanwhile, the guide rail 5626 of the link member 562 slides in the guide chute of the corresponding link member 553, the first sleeve 5620, the driving gear 5623 and the pushing member 572 of the link member 562 rotate around the corresponding first connection shaft 561, the rotating driving gear 5623 drives the other driving gear 5623 to rotate through the gear combination 564, and the rotation of the other driving gear 5623 drives the corresponding first sleeve 5620, pushing member 572 and link 5625 to rotate, and the guide rail 5626 of the other link member 562 slides in the guide chute 5530 of the corresponding link member 553, so that the two link members 562 of the link assembly 56 synchronously draw close to each other; at the same time, the pushing member 572 rotates relative to the pushing member 573, so that the first cam 5722 of the pushing member 572 rotationally pushes the second cam 5732, and the pushing member 573 slides along the axial direction of the first connecting shaft 561 to press the elastic member 575, and the elastic member 575 elastically pushes the positioning member 576. In the process of bending the linkage assembly 56, the adjusting shaft 5628 rotates from the second positioning section 5237b in the corresponding adjusting groove 5237 and slides to the first positioning section 5237a, the two link members 562 rotate around the corresponding first connecting shafts 561 respectively to be mutually close so as to mutually close the two side supporting hinges 523, the rotating shaft device 50 is in a bending state, the bendable region 31 of the flexible screen 30 is bent along with the rotating shaft device 50 until the front surfaces of the two non-bending regions 33 of the flexible screen 30 are mutually attached, and the bendable region 31 is bent into a water drop shape, so that seamless folding of the electronic device 100 is realized.

During bending of the electronic device 100, frictional torque between the first cam 5722 and the second cam 5732 can limit the rebound of the flexible screen 30, so that the side support hinge 523 is positioned at a specific angle with respect to the middle support hinge 521, and can limit the two frames 21 to a specific angle between 180 degrees and 0 degrees. When the two frames 21 are bent and limited at 0 degrees, the bendable region 31 of the flexible screen 30 is bent to form a droplet shape, so as to reduce the duty ratio of the bent bendable region 31, and thus the overall thickness of the electronic device 100 can be reduced.

In other bending modes of the electronic device 100, bending forces can be applied to the two frames 21 at the same time, and the two frames 21 respectively drive the two side supporting hinges 523 to rotate relative to the side close to the flexible screen 30, and bending of the electronic device 100 can be achieved through the rotating shaft device 50.

When it is necessary to flatten the electronic apparatus 100, one of the frames 21 is pulled outward, so that the two rotating frames 55 connected to the two frames 21 are rotated in directions away from each other. Specifically, an outward pulling force is applied to one of the frames 21 of the electronic device 100, where the one of the frames 21 drives the corresponding rotating frame 55 to rotate relative to the base 54 to a side far away from the flexible screen 30, so that the guide rail 5626 of the link member 562 slides in the guide rail 553 of the corresponding link member 553, the first sleeve 5620, the driving gear 5623 and the pushing member 572 of the link member 562 rotate around the corresponding first connecting shaft 561, the rotating driving gear 5623 drives the other driving gear 5623 to rotate through the gear combination 564, and the rotation of the other driving gear 5623 drives the corresponding first sleeve 5620, the pushing member 572 and the link 5625 to rotate around the corresponding first connecting shaft 561, and the guide rail 5626 of the other link member 562 slides in the guide rail 553 of the corresponding link member 553, so that the two link members 562 of the link assembly 56 are far away from each other; at the same time, the pushing member 572 rotates relative to the pushing member 573, so that the first cam 5722 of the pushing member 572 rotationally pushes the second cam 5732, the pushing member 573 slides along the axial direction of the first connecting shaft 561, and the elastic member 575 elastically pushes against between the positioning member 576 and the pushing member 573. During the bending process of the linkage assembly 56, the adjusting shaft 5628 rotates in the corresponding adjusting groove 5237 from the first positioning segment 5237a to the second positioning segment 5237b, and the two link members 562 rotate around the corresponding first connecting shafts 561 to be away from each other, so as to separate the two side support hinges 523 from each other, so that the rotating shaft device 50 is unfolded, and the bendable region 31 of the flexible screen 30 is unfolded along with the rotating shaft device 50 until the flexible screen 30 is flattened.

During flattening of the electronic device 100, frictional torque between the first cam 5722 and the second cam 5732 can limit the rebound of the flexible screen 30 to position the side support hinge 523 at a specific angle relative to the middle support hinge 521, enabling the two frames 21 to be limited to a specific angle between 0 degrees and 180 degrees.

In other bending modes of the electronic device 100, an outward pulling force can be applied to the two frames 21 at the same time, and the two frames 21 respectively drive the rotating frames 55 at two opposite sides of the base 54 to rotate away from each other, so as to drive the link members 562 at two opposite sides of the base 54 to rotate away from each other, so that the two side supporting hinges 523 rotate towards a side far from the flexible screen 30, and the electronic device 100 is unfolded through the rotating shaft device 50.

The rotating shaft device 50 of the electronic equipment 100 realizes synchronous bending or unfolding through the folding-assisting mechanism 51, and the elastic piece 575 can provide larger axial force, so that larger friction torsion exists between the first cam 5722 and the second cam 5732; therefore, the bending of the electronic equipment 100 can be stably limited at a specific angle between 0 and 180 degrees, and the hovering function of the whole machine is realized; second, link member 562 and pusher member 572 may be formed of different materials, enabling the wear resistance of pusher member 572 to be greater than that of link member 562, thereby avoiding the first cam 5722 of pusher member 572 from being easily worn; the link member 562 has a toughness greater than that of the pusher member 572, allowing the link member 562 to be both strong and tough to avoid easier breakage during drop testing, and greatly improving reliability. In addition, because the overall volume of the rotating shaft device 50 is smaller, the rotating shaft device 50 occupies the internal space of the folding housing 20, which is not only beneficial to the layout of other elements such as a main board or a battery in the electronic device 100 and the miniaturization development, but also has high connection reliability between the components of the rotating shaft device 50, and avoids the damage to the flexible screen 30 caused by the displacement of the elements when the electronic device 100 falls.

The foregoing is a description of embodiments of the present invention, and it should be noted that, for those skilled in the art, modifications and variations can be made without departing from the principles of the embodiments of the present invention, and such modifications and variations are also considered to be within the scope of the present invention.

Claims

1. A spindle assembly, the spindle assembly comprising:

the linkage assembly comprises a first connecting shaft and a connecting rod piece, and the connecting rod piece is connected to the first connecting shaft; and

the limiting assembly comprises a pushing piece, a pushing piece and an elastic piece, wherein the pushing piece and the pushing piece are sleeved on the first connecting shaft, the pushing piece is detachably connected with the connecting rod piece, the pushing piece is positioned between the connecting rod piece and the pushing piece, and the elastic piece is used for providing elastic force for enabling the pushing piece and the pushing piece to mutually push against each other;

when the connecting rod piece rotates around the first connecting shaft, the pushing piece rotates along with the connecting rod piece and rotates relative to the supporting piece, and friction torsion is arranged between the pushing piece and the supporting piece and used for positioning the connecting rod piece.

2. The apparatus according to claim 1, wherein the linkage assembly comprises two first connecting shafts and two connecting rods, one of the connecting rods is rotatably connected to one of the first connecting shafts, and the other connecting rod is rotatably connected to the other of the first connecting shafts.

3. The rotating shaft device according to claim 1, wherein the resistance to wear of the pushing member is greater than the resistance to wear of the link member; the pushing piece is made of wear-resistant ceramics, nichrome, tungsten carbide alloy or aluminum oxide.

4. The rotary shaft device according to claim 1, wherein the pushing member and the link member are detachably connected by engagement of a positioning projection provided on one of the pushing member and the link member and a positioning groove provided on the other of the pushing member and the link member.

5. The rotating shaft device according to claim 4, wherein the link member includes a first sleeve sleeved on the first connecting shaft, and the first sleeve is provided with a plurality of positioning protrusions on an end surface facing the pushing member; the pushing piece comprises a second sleeve sleeved on the first connecting shaft, a plurality of positioning grooves are formed in the end face, facing the first sleeve, of the second sleeve, and the positioning protrusions are meshed with the positioning grooves in a one-to-one correspondence mode.

6. The rotary shaft device according to claim 5, wherein the second sleeve further comprises a first cam sleeved on the first connecting shaft, and the first cam is arranged at one end of the second sleeve, which is away from the positioning groove; the supporting piece comprises a second cam sleeved on the first connecting shaft, the first cam and the second cam are supported in a mutually rotating mode, and friction torsion between the first cam and the second cam can enable the connecting rod piece to be positioned relative to the limiting assembly.

7. The rotating shaft device according to claim 6, wherein the first cam is provided with a plurality of first protruding portions and a plurality of first recessed portions along a circumferential direction thereof, the second cam is provided with a plurality of second protruding portions and a plurality of second recessed portions along a circumferential direction thereof, wherein the first protruding portions are engageable with the second recessed portions, the second protruding portions are engageable with the first recessed portions, and the plurality of positioning grooves and the plurality of first recessed portions are aligned respectively in an axial direction of the two sleeves.

8. The rotary shaft device according to claim 7, wherein three of the positioning grooves are arranged at regular intervals in the circumferential direction of the second sleeve, three of the first recessed portions are arranged at regular intervals in the circumferential direction of the second sleeve, and the three positioning grooves are aligned with the three first recessed portions, respectively, in the axial direction of the second sleeve.

9. The spindle apparatus of claim 4 wherein the positioning projection includes two opposing first positioning surfaces and the positioning recess includes two opposing second positioning surfaces; when the positioning protrusion is accommodated in the positioning groove, the two first positioning surfaces respectively abut against the two second positioning surfaces.

10. A spindle apparatus according to claim 4 or 9, wherein the positioning projection is a sector, the positioning recess is a sector groove, and the sector is positioned in the sector groove.

11. The rotating shaft device according to claim 5, wherein a fool-proof mechanism is arranged between the pushing member and the connecting rod member, the fool-proof mechanism comprises a fool-proof protrusion and a fool-proof groove, the fool-proof protrusion is arranged on one of the pushing member and the connecting rod member, the fool-proof groove is arranged on the other one of the pushing member and the connecting rod member, and the fool-proof protrusion is matched and positioned with the fool-proof groove.

12. The rotating shaft device according to claim 11, wherein the end surface of the first sleeve facing the second sleeve is provided with the fool-proof protrusion, the fool-proof protrusion is located between two adjacent positioning protrusions, the end surface of the second sleeve facing the first sleeve is provided with a fool-proof groove, and the fool-proof groove is located between two adjacent positioning grooves; or the fool-proof groove is formed in the positioning protrusion of the first sleeve, the second sleeve faces towards the end face of the first sleeve, the fool-proof protrusion is located in the positioning groove, and when the positioning protrusion is matched with the positioning groove, the fool-proof protrusion is located in the fool-proof groove.

13. The apparatus according to claim 2, wherein the linkage assembly further comprises a positioning seat and a positioning member, the first connecting shaft is connected between the positioning seat and the positioning member, and the elastic member is sleeved on the first connecting shaft and is clamped by the positioning member and the abutting member.

14. A folding housing comprising two frames and a spindle device according to any one of claims 1-13, said spindle device being arranged between two of said frames.

15. An electronic device, comprising a flexible screen, a housing and a rotating shaft device according to any one of claims 1-13, wherein the housing comprises two frames, the rotating shaft device is arranged between the two frames, the flexible screen is arranged between the housing and the rotating shaft device, and the flexible screen can be bent or flattened along with the rotating shaft device.