CN113982396B

CN113982396B - Hinge structure

Info

Publication number: CN113982396B
Application number: CN202111287430.2A
Authority: CN
Inventors: 胡旭升
Original assignee: Zhejiang Wang Li'an Defense Products Co ltd
Current assignee: Zhejiang Wang Li'an Defense Products Co ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2023-06-02
Anticipated expiration: 2041-11-02
Also published as: CN113982396A

Abstract

The invention discloses a hinge hinging structure, which comprises a middle connecting part (1), wherein an end connecting sleeve (3) of an end shaft hole (2) is formed in a through hole mode, and an end mandrel (4) sleeved in the end shaft hole formed on the end connecting sleeve. The middle connecting part and the end connecting sleeve are rotationally connected together with the same rotation axis. The end core shaft and the middle connecting part are provided with non-circular embedded structures, the end core shaft is provided with a fixing hole (6) with a through hole, and one fixing structure penetrates through the fixing hole to fixedly connect the end core shaft with the middle connecting part. The fixing structure is not in moving contact with the connecting sleeve of the hinge, and the fixing structure is not subjected to any friction effect in the working process, so that the problem that the mandrel is loosened due to continuous mutual friction after being used for a period of time is effectively solved.

Description

Hinge structure

Technical Field

The invention relates to the field of door and window wings, in particular to a hinge mandrel.

Background

The hinge is an indispensable product between a fixed movable door and window and a door and window frame which are used as an opening and closing function on a flat-open door and window. The hinge is usually composed of two mutually rotatable leaves, the part of which is hinged to each other penetrating a spindle for fixing the mutual position of the two leaves and ensuring the mutual rotational movement. Currently, hinge spindles are basically manufactured by riveting or clamping two ends of a single piece, or by fixing two screws or nuts. Resulting in a length of the mandrel that tends to expose both end faces of the hinge. In the application occasion of the concealed hinge, in order to avoid the part on the end face of the hinge, which is higher than the end face of the hinge, the installation width can only be increased, and the whole appearance and the product delicacy of the whole door and window product are obviously influenced. The screw and nut mode is adopted, and the hidden danger that the screw or the nut is loosened due to continuous mutual friction along with the continuous opening and closing action of the hinge in the long-term use process also exists.

Chinese patent document CN214330551U discloses a hinge, including first hinge board, second hinge board and dabber, first hinge board dabber installation side is equipped with the female cover of dabber, and the female cover of dabber begins first hinge board lower part, and second hinge board dabber installation side is equipped with the public cover of dabber, and the public cover of dabber begins second hinge board upper portion, and the dabber lower extreme inserts in the female cover of dabber of first hinge board, and the upper end inserts in the public cover of dabber of second hinge board, can rotate relatively between first hinge board and the second hinge board, and second hinge board and dabber can dismantle the branch with first hinge board and close. The prior art provides a technical proposal that the length of the mandrel does not protrude out of the two end faces of the hinge. When the door leaf is required to be separated from the door frame in the specification, the lower end of the mandrel is only required to be pulled out of the mandrel female sleeve of the first hinge plate, so that the second hinge plate is separated from the first hinge plate, and the mandrel is fixedly connected with the mandrel male sleeve. Although the connection between the two is not further described in this prior art, it is known that the usual connection is not a welded, riveted, clamped connection or the like. When the connecting parts of the connecting modes are still in hinge opening, on the transmission path of force between opening and closing thrust and friction force between the mandrel female sleeve and the mandrel, after the connecting parts are used for a period of time, due to continuous mutual friction between the lower end of the mandrel and the mandrel female sleeve, certain interaction force can be born between the mandrel and the mandrel male sleeve, and the hidden danger of loosening between the mandrel and the mandrel male sleeve can be caused by the lasting action of the action force.

Disclosure of Invention

Therefore, the invention aims to solve the technical problem that the mandrel is loosened after being used for a period of time due to continuous mutual friction in the prior art.

In order to solve the above technical problems, a hinge structure of the present invention includes:

an intermediate connection portion;

the end connecting sleeve is provided with an end shaft hole in a forming mode, and the end shaft hole is a through hole;

the end mandrel is sleeved in the end shaft hole formed on the end connecting sleeve, and the middle connecting part and the end connecting sleeve are rotationally connected together by the same rotation axis;

the end core shaft is provided with a fixing hole with a through hole, and one fixing structure penetrates through the fixing hole to fixedly connect the end core shaft with the middle connecting part.

Further, the non-circular jogged structure comprises a jogged groove formed on the end face of the middle connecting part facing the end core shaft and with a non-circular section which is concave along the rotation axis, and a jogged plug which is arranged on one end of the end core shaft facing the middle connecting part and is matched and inserted with the non-circular section of the jogged groove.

Further, the fixing structure comprises a connecting structure formed by the middle connecting part opposite to the fixing hole after the middle connecting part is embedded with the end core shaft, and a connecting piece which passes through the fixing hole and is connected with the connecting structure in a matching way.

Further, the connecting structure is a fixing screw hole formed on the middle connecting part, the connecting piece is a screw which penetrates through the fixing hole of the circular through hole and is in threaded fit with the fixing screw hole, and the nut of the screw is smaller than the minimum radial dimension of the end shaft hole.

Further, a bearing mechanism is provided between the intermediate connection and the end connection sleeve.

Further, the bearing mechanism has a pressure bearing.

Further, the middle connecting part is provided with a middle connecting sleeve formed with a middle shaft hole and a middle mandrel rotationally arranged in the middle shaft hole, and the diameter of the middle mandrel is larger than the minimum radial dimension of the fixing hole; the non-circular embedded structure on the middle connecting part is arranged on the middle mandrel.

Further, the end connecting sleeve and the end mandrel are provided with matched non-circular sections.

Further, a positioning mechanism at least provided with an open position and a closed position is arranged between the middle connecting sleeve and the middle mandrel.

Further, the positioning mechanism comprises an elastic clamping point arranged on the middle mandrel and a clamping groove arranged on the corresponding position of the inner wall of the middle shaft hole of the middle connecting sleeve and the elastic clamping point.

Further, the elastic snap point includes a mounting hole formed radially on the intermediate shaft, a marble disposed in the mounting hole, and an elastic member for applying a biasing force to the marble in the mounting hole in a direction toward an inner wall of the intermediate shaft hole.

Further, a bearing mechanism is arranged between the middle connecting sleeve and the end connecting sleeve.

Further, the bearing mechanism is provided with a pressure bearing which is arranged between the middle connecting sleeve and the end connecting sleeve and bears pressure; and a rotating bearing arranged between the inner wall of the middle shaft hole of the middle connecting sleeve and the middle mandrel.

Compared with the prior art, the technical scheme of the invention has the advantages that the end core shaft is provided with the fixing hole with the through hole, and the fixing structure penetrates through the fixing hole to fixedly connect the end core shaft with the middle connecting part, so that the end core shaft and the middle connecting part keep synchronous rotation through the non-circular jogged structure in the working process. And because the fixing structure is positioned in the fixing hole, and the connecting sleeve of the hinge is positioned at the outer circle side of the mandrel, the fixing structure and the connecting sleeve of the hinge are not in moving contact, and the fixing structure cannot be subjected to any friction effect in the working process, so that the problem that the mandrel is loosened due to continuous mutual friction after being used for a period of time is effectively solved.

The bearing mechanism is arranged between the middle connecting part and the end connecting sleeve, so that the influence of acting force of friction action between parts in the working process is further reduced, and the switching action can be easier.

The end mandrel will be restrained from rotating relative to the end connection sleeve, i.e. only the intermediate mandrel may rotate relative to the intermediate connection sleeve. And a positioning mechanism is arranged between the intermediate connecting sleeve and the intermediate mandrel, so that the rotating position of the fan body can be positioned through a hinge structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is an exploded perspective view of one embodiment of a hinge connection of the present invention;

FIG. 2 is a partial sectional view of the assembled embodiment of FIG. 1;

FIG. 3 is an exploded perspective view of another embodiment of the hinge connection of the present invention;

FIG. 4 is a partial sectional view of the assembled embodiment of FIG. 3;

FIG. 5 is an exploded perspective view of the embodiment of FIG. 3 with the addition of a positioning mechanism;

fig. 6 is an exploded perspective view of a positioning mechanism disposed on a combined mandrel.

Reference numerals illustrate:

1-middle connecting part, 2-end shaft hole, 3-end connecting sleeve, 4-end mandrel, 5-jogged tooth claw, 6-fixed hole, 7-fixed screw hole, 8-screw, 9-pressure bearing, 10-middle shaft hole, 11-middle connecting sleeve, 12-middle mandrel, 13-caulking groove, 14-plug, 15-rotating bearing, 16-clamping groove, 17-mounting hole, 18-marble, 19-spiral spring, 20-chute and 21-bulge.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Fig. 1 and 2 show an embodiment of the hinge structure of the present invention, which includes an intermediate connection part 1 fixed to one side mounting blade of the hinge, an end connection sleeve 3 fixed to the other side mounting blade of the hinge and having an end shaft hole 2 formed in the form of a through hole, and an end mandrel 4 sleeved on the end connection sleeve 3. In this embodiment, each of the mounting blades has one of the intermediate connection portions 1 and the end connection sleeve 3. The end mandrel 4 connects the intermediate connection 1 and the end connection sleeve 3 together in a rotationally fixed manner with the same axis of rotation. A non-circular jogged structure for limiting the rotation of the end mandrel 4 and the middle connecting part 1 along the rotation axis of the hinge is arranged between the two parts. In this embodiment, the non-circular engaging structure includes engaging claws 5 formed on opposite end surfaces of the intermediate connecting portion 1 and the end core shaft 4 and protruding toward each other along the rotation axis. The end core shaft 4 is provided with a fixing hole 6 with a through hole, and the fixing hole is used as a fixing structure penetrating through the fixing hole 6, and comprises a fixing screw hole 7 which is used as a connecting structure and is formed at the position, opposite to the fixing hole 6, of the intermediate connecting part 1 after the intermediate connecting part 1 is embedded with the end core shaft 4, and a screw 8 which is used as a connecting piece and penetrates through the fixing hole 6 and is connected with the fixing screw hole 7 in a matching way. The screw 8 passes through the fixing hole 6 of the circular through hole and is in threaded fit with the fixing screw hole 7 to fixedly connect the end mandrel 4 with the intermediate connecting portion 1, and the nut of the screw 8 is smaller than the minimum radial dimension of the end shaft hole 2, in this embodiment, the diameter of the nut is smaller than the diameter of the end shaft hole 2.

During assembly, the intermediate connecting part 1 fixed on the one-side mounting blade of the hinge and the end connecting sleeve 3 fixed on the one-side mounting blade of the hinge are matched and placed together in alignment with the rotation axis of the hinge. The end core shaft 4 passes through the end shaft hole 2 on the end connecting sleeve 3, and the end core shaft 4 and the jogged tooth claw 5 between the middle connecting part 1 are correspondingly jogged and connected. And then the screw 8 is screwed with the fixing screw hole 7 formed on the middle connecting part 1 through the fixing hole 6 on the end core shaft 4, so that the end core shaft 4 and the middle connecting part 1 are fixed.

In use of the embodiment, friction generated by the opening and closing action of the hinge and around the circumferential direction of the rotation shaft exists between the inner wall of the end shaft hole 2 of the end connecting sleeve 3 and the outer wall of the end mandrel 4. The engaged teeth 5 protruding toward each other along the rotation axis between the end core shaft 4 and the intermediate connection part 1 limit the rotation of the end core shaft 4 relative to the intermediate connection part 1, so that the friction force generated by the hinge opening and closing action is limited to the friction force between the end core shaft 3 and the end core shaft 4, and the screw 8 passing through the fixing hole 6 on the end core shaft 4 is positioned inside the end core shaft 4, and the diameter of the nut is smaller than the diameter of the end shaft hole 2 of the end core shaft 3, so that the rotation of the end core shaft 3 relative to the intermediate connection part 1 does not have any influence on the screwing fixation of the screw 8 in the fixing screw hole 7 on the intermediate connection part 1. In this way, in the use process, the screw 8 always makes the jogged tooth claw 5 between the end mandrel 4 and the middle connecting part 1 mutually press fit, and the jogged tooth claw 5 prevents the friction force of the end connecting sleeve 3 on the end mandrel 4 from driving the end mandrel 4 to rotate relative to the middle connecting part 1. The problem of the end spindles 4 coming loose from each other relative to the intermediate connection 1 due to the opening and closing action of the hinge is avoided.

In the above embodiment, in order to reduce the frictional resistance of the switching sectors, a pressure bearing 9 as a bearing mechanism may be provided between the intermediate connection portion 1 and the end connection sleeve 3.

Referring to fig. 3 and 4, another embodiment of a hinge structure according to the present invention is provided, in which the intermediate connection part 1 is formed of an intermediate connection sleeve 11 formed with an intermediate shaft hole 10 and an intermediate mandrel 12 rotatably provided in the intermediate shaft hole 10. The end connecting sleeve 3 still has an end shaft hole 2 formed in the form of a through hole, and the end mandrel 4 is sleeved in the end shaft hole 2 formed on the end connecting sleeve 3. In this embodiment, the middle connecting sleeve 11 is one and is fixedly connected to one side blade of the hinge. The two end connecting sleeves 3 are respectively positioned at two ends of the middle connecting sleeve 11 and fixedly connected to the other side blade of the hinge. The intermediate connecting sleeve 11 rotates around the same rotation axis relative to the intermediate mandrel 12 and the end connecting sleeve 3 relative to the end mandrel 4, that is, the intermediate connecting part 1 and the end connecting sleeve 3 are rotationally connected together with the same rotation axis. A non-circular fitting structure for limiting rotation of the end mandrel 4 and the middle mandrel 12 along the rotation axis of the hinge is arranged between the connecting ends of the two, and in this embodiment, the non-circular fitting structure includes a caulking groove 13 formed on an end face of the middle mandrel 12 facing the end mandrel 4 and having a non-circular cross section recessed along the rotation axis, and a fitting plug 14 disposed on an end of the end mandrel 4 facing the middle mandrel 12 and inserted in cooperation with the non-circular cross section of the caulking groove 13. The end core shaft 4 is provided with a fixing hole 6 with a through hole, after the middle core shaft 12 is embedded with the end core shaft 4, a fixing screw hole 7 is formed at the position, opposite to the fixing hole 6, of the middle core shaft 12, and a screw 8 penetrates through the fixing hole 6 with a round through hole to be in screw joint fit with the fixing screw hole 7 so as to fixedly connect the end core shaft 4 with the middle core shaft 12. In this embodiment, the diameter of the intermediate mandrel 12 is larger than the inner diameter of the end shaft hole 2. The non-circular fitting structure on the intermediate connection portion 1 is provided on the intermediate mandrel 12. The cap of the screw 8 is smaller than the smallest radial dimension of the end shaft bore 2, in this embodiment smaller than the inner diameter of the end shaft bore 2.

Also, in order to reduce the friction resistance of the switching sector, it is also possible to provide the bearing means between the intermediate connection 1 and the end connection sleeve 3, which bearing means in this embodiment have a pressure bearing 9 which is arranged between the intermediate connection sleeve 11 and the end connection sleeve 3 and which bears the pressure; and a rotary bearing 15 disposed between the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11 and the intermediate mandrel 12.

In this embodiment, the intermediate mandrel 12 is placed into the intermediate shaft hole 10 of the intermediate connecting sleeve 11 during assembly. Then, the rotary bearings 15 are placed at both ends of the intermediate shaft hole 10, and the two pressure bearings 9 are placed at both ends of the intermediate connecting sleeve 11. The end connection sleeve 3 is then placed together in cooperation with the intermediate connection sleeve 11 in alignment with the axis of rotation of the hinge. And the end mandrel 4 passes through the end shaft hole 2 on the end connecting sleeve 3, and the embedded plug 14 on the end mandrel is correspondingly matched and embedded with the embedded groove 13 on the middle mandrel 12. And then the screw 8 is screwed with a fixing screw hole 7 formed on the middle connecting part 1 through the fixing hole 6 on the end mandrel 4, so as to fix the end mandrel 4 and the middle mandrel 12 together. Since the diameter of the intermediate mandrel 12 is larger than the inner diameter of the end shaft hole 2, after the end mandrel 4 and the intermediate mandrel 12 are fixed together, the combined mandrel cannot axially move, so that the intermediate mandrel 12 and the end mandrel 4 are held in the intermediate connecting sleeve 11 and the end connecting sleeve 3.

In use of this embodiment, the end connection sleeve 3 may be rotated about the end mandrel 4 and the intermediate connection sleeve 11 may be rotated about the intermediate mandrel 12. Friction force generated by the opening and closing operation of the hinge in the circumferential direction around the rotation axis may exist between the inner wall of the end shaft hole 2 of the end connecting sleeve 3 and the outer wall of the end mandrel 4, or may exist between the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11 and the outer wall of the intermediate mandrel 12. Since the fitting plug 14 of the end mandrel 4 is fitted into the fitting groove 13 on the opposite end face of the intermediate mandrel 12, the rotation of the end mandrel 4 relative to the intermediate mandrel 12 about the rotation axis is restricted, and therefore, the friction force generated by the hinge opening and closing operation is limited only between the end connecting sleeve 3 and the end mandrel 4 and between the intermediate connecting sleeve 11 and the intermediate mandrel 12, and the screw 8 passing through the fixing hole 6 on the end mandrel 4 is located inside the end mandrel 4 and has a smaller diameter than the diameter of the end shaft hole 2 of the end connecting sleeve 3, so that the rotation of the end connecting sleeve 3 relative to the intermediate mandrel 12 does not have any influence on the screw fixation of the screw 8 in the fixing screw hole 7 on the intermediate mandrel 12. In this way, during use, the screw 8 always makes the engaging tooth claw 5 between the end mandrel 4 and the intermediate mandrel 12 press-fit with each other, and the engaging tooth claw 5 prevents the friction force of the end connecting sleeve 3 on the end mandrel 4 from driving the end mandrel 4 to rotate relative to the intermediate mandrel 12. The problem of the opening and closing action of the hinge causing the end spindles 4 to come loose from each other relative to the intermediate spindle 12 is thereby avoided.

Referring to fig. 5, an alternative embodiment to the embodiment shown in fig. 3, 4 is provided. Wherein the end connecting sleeve 3 and the end mandrel 4 are replaced by a matched non-circular section. And a positioning mechanism at least comprising an open position and a closed position is arranged between the intermediate connecting sleeve 11 and the intermediate mandrel 12. In this embodiment, the positioning mechanism includes an elastic clamping point disposed on the central spindle 12, and a clamping groove 16 disposed on a position of the inner wall of the central shaft hole 10 of the central connecting sleeve 11 corresponding to the elastic clamping point. Referring to fig. 6, the elastic snap point includes a mounting hole 17 formed radially on the intermediate mandrel 12, two beads 18 provided in both ends of the mounting hole 17, respectively, and a coil spring 19 as an elastic member for applying a biasing force to the two beads 18 in the mounting hole 17 toward the inner wall direction of the intermediate shaft hole 10. The clamping groove 16 is disposed on the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11, and may be two positions of closing and opening corresponding to two mounting blades of the hinge, or one or several semi-open positions may be set between the two positions. In this embodiment, a limiting mechanism formed by a chute 20 formed on the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11 and a protrusion 21 provided on the outer wall of the intermediate shaft 12 is further provided between the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11 and the outer wall of the intermediate shaft 12, and the limiting mechanism limits the rotation of the hinge between the closed position and the open position.

In this embodiment, during assembly, the coil spring 19 is placed in the mounting hole 17 before the assembly step of the embodiment shown in fig. 3 and 4, and then two marbles 18 are placed from both ends of the mounting hole 17. The intermediate mandrel 12 thus assembled is then placed into the intermediate shaft bore 10 of the intermediate connecting sleeve 11. The other assembly steps are the same as those of the embodiment shown in fig. 3 and 4.

In use, since the end connecting sleeve 3 and the end mandrel 4 have matched non-circular cross sections, the end connecting sleeve 3 and the end mandrel 4 can not rotate any more, and only the middle connecting sleeve 11 can rotate around the middle mandrel 12. In this way, at any positioning position of the hinge, the marble 18 on the intermediate mandrel 12 is clamped into the clamping groove 16 formed on the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11 under the action of the biasing force of the spiral spring 19, so that slight external force such as wind force cannot easily drive the intermediate mandrel 12 to rotate in the intermediate connecting sleeve 11. When the two mounting blades of the hinge are required to rotate relatively, the acting force acting on the fan body drives the intermediate mandrel 12 to generate a relative rotation trend in the intermediate connecting sleeve 11, and the trend makes the groove edge part of the clamping groove 16 formed on the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11 apply force to the marble 18 to enable the marble to retract into the mounting hole 17 against the biasing force of the coil spring 19, so that the locking of the intermediate mandrel 12 relative to the intermediate connecting sleeve 11 is released. The intermediate mandrel 12 is further rotated relative to the intermediate connecting sleeve 11 until the marble 18 encounters the catching groove 16 at another position, and is ejected and caught in the catching groove 16 by the biasing force of the coil spring 19. When the intermediate mandrel 12 rotates to an open position relative to the intermediate connecting sleeve 11, the protrusions 21 on the outer wall of the intermediate mandrel 12 encounter the sliding grooves 20 on the inner wall of the intermediate shaft hole 10 of the intermediate connecting sleeve 11, thereby limiting the over-rotation of the intermediate mandrel 12 relative to the intermediate connecting sleeve 11.

Of course, in the embodiment shown in fig. 5, a limiting mechanism between the intermediate connecting sleeve 11 and the intermediate mandrel 12 may not be provided.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.

Claims

1. A hinge structure comprising:

an intermediate connection part (1);

an end connecting sleeve (3) is provided with an end shaft hole (2), and the end shaft hole (2) is a through hole;

an end mandrel (4) sleeved in the end shaft hole (2) formed on the end connecting sleeve (3) and used for rotationally connecting the middle connecting part (1) and the end connecting sleeve (3) together with the same rotation axis;

it is characterized in that

A non-circular embedded structure is arranged between the end core shaft (4) and the middle connecting part (1), a fixing hole (6) with a through hole is formed in the end core shaft (4), and one fixing structure penetrates through the fixing hole (6) to fixedly connect the end core shaft (4) with the middle connecting part (1).

2. The hinge joint structure according to claim 1, wherein: the non-circular embedded structure comprises an embedded groove (13) which is formed on the end face, facing the end core shaft (4), of the middle connecting part (1) and is concave along the rotation axis and an embedded plug (14) which is arranged on one end, facing the middle connecting part (1), of the end core shaft (4) and is matched and embedded with the non-circular section of the embedded groove (13).

3. The hinge joint structure according to claim 1 or 2, characterized in that: the fixing structure comprises a connecting structure formed by the middle connecting part (1) opposite to the fixing hole (6) after the middle connecting part (1) is embedded with the end mandrel (4), and a connecting piece which passes through the fixing hole (6) and is connected with the connecting structure in a matching way.

4. A hinge joint according to claim 3, wherein: the connecting structure is a fixing screw hole (7) formed in the middle connecting part (1), the connecting piece is a screw (8) which penetrates through the fixing hole (6) of the round through hole and is in threaded connection with the fixing screw hole (7), and a nut of the screw (8) is smaller than the minimum radial dimension of the end shaft hole (2).

5. The hinge joint structure according to claim 1, wherein: a bearing mechanism is arranged between the middle connecting part (1) and the end connecting sleeve (3).

6. The hinge assembly of claim 5, wherein: the bearing mechanism has a pressure bearing (9).

7. The hinge joint structure according to claim 1, wherein: the middle connecting part (1) is provided with a middle connecting sleeve (11) with a middle shaft hole (10) and a middle mandrel (12) rotatably arranged in the middle shaft hole (10), and the outer diameter of the middle mandrel (12) is larger than the minimum radial dimension of the end shaft hole (2); the non-circular embedded structure on the middle connecting part (1) is arranged on the middle mandrel (12).

8. The hinge assembly of claim 7, wherein: the end connecting sleeve (3) and the end mandrel (4) are provided with matched non-circular sections.

9. The hinge assembly of claim 8, wherein: and a positioning mechanism at least provided with an open position and a closed position is arranged between the intermediate connecting sleeve (11) and the intermediate mandrel (12).

10. The hinge assembly of claim 9, wherein: the positioning mechanism comprises an elastic clamping point arranged on the middle mandrel (12) and a clamping groove (16) arranged at a position corresponding to the elastic clamping point on the inner wall of the middle shaft hole (10) of the middle connecting sleeve (11).

11. The hinge assembly of claim 10, wherein: the elastic clamping point comprises a mounting hole (17) formed on the middle mandrel (12) in a radial mode, a marble (18) arranged in the mounting hole (17), and an elastic piece which is used for applying a biasing force to the marble (18) in the mounting hole (17) in the direction of the inner wall of the middle mandrel hole (10).

12. A hinge construction according to any one of claims 7-11, wherein: a bearing mechanism is arranged between the intermediate connecting sleeve (11) and the end connecting sleeve (3).

13. The hinge assembly of claim 12, wherein: the bearing mechanism is provided with a pressure bearing (9) which is arranged between the middle connecting sleeve (11) and the end connecting sleeve (3) and bears pressure; and a rotating bearing (15) arranged between the inner wall of the intermediate shaft hole (10) of the intermediate connecting sleeve (11) and the intermediate mandrel (12).