CN113982396A

CN113982396A - Hinge structure

Info

Publication number: CN113982396A
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: 2022-01-28
Anticipated expiration: 2041-11-02
Also published as: CN113982396B

Abstract

The invention discloses a hinge structure, which comprises an intermediate connecting part (1), an end connecting sleeve (3) and an end core shaft (4), wherein the end connecting sleeve (3) is formed with an end shaft hole (2) in a through hole mode, and the end core shaft is sleeved in the end shaft hole formed in the end connecting sleeve. The middle connecting part and the end connecting sleeve are rotationally connected together by the same rotation axis. The end part core shaft is provided with a non-circular embedded structure between the end part core shaft and the middle connecting part, the end part core shaft is provided with a fixing hole (6) of a through hole, and one fixing structure penetrates through the fixing hole to fixedly connect the end part core shaft with the middle connecting part. Because the fixed structure is not in moving contact with the connecting sleeve of the hinge, the fixed structure can not be subjected to any friction action in the working process, and 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 sashes, in particular to a hinge mandrel.

Background

The hinge is an indispensable product between the fixed movable door window and the door window frame which are used as the opening and closing functions on the casement door window. The hinge is usually composed of two mutually rotatable leaves, and the mutually hinged parts are penetrated into a core shaft for fixing the mutual positions of the two leaves and ensuring the mutual rotary motion. The hinge mandrels on the market at present are basically integral, and are fixed by riveting or clamping at two ends, or by 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, the installation width can only be increased in order to avoid the raised part on the end face of the hinge, and the integral appearance and the product delicate feeling of the whole door and window product are obviously influenced. By adopting the screw and nut mode, the hidden trouble that the screw or the nut is loosened due to continuous mutual friction along with the continuous opening and closing action of the hinge can also exist in the long-term use process.

Chinese patent document CN214330551U discloses a hinge, including first hinge plate, second hinge plate and dabber, first hinge plate dabber axle installation side is equipped with the female cover of dabber, the female cover of dabber begins in first hinge plate lower part, second hinge plate dabber axle installation side is equipped with the public cover of dabber, the public cover of dabber begins in second hinge plate upper portion, the dabber lower extreme inserts in the female cover of dabber of first hinge plate, the upper end inserts in the public cover of dabber of second hinge plate, can rotate relatively between first hinge plate and the second hinge plate, second hinge plate and dabber can be dismantled deciliter with first hinge plate. This prior art provides a solution where the length of the mandrel does not protrude beyond the two end faces of the hinge. The description that the lower end of the mandrel is only required to be pulled out from the mandrel female sleeve of the first hinge plate to separate the second hinge plate from the first hinge plate when the door leaf and the door frame are required to be separated in the specification shows that the mandrel and the mandrel male sleeve are fixedly connected. Although the connection between the two is not further described in the prior art, the common connection is not known to be welding, riveting, clamping, etc. When the connection parts of the connection modes are still positioned at the hinge for opening and closing, on the transmission path of the force between the opening and closing thrust and the friction force between the mandrel female sleeve and the mandrel, after the hinge is used for a period of time, a certain interaction force is born between the mandrel and the mandrel male sleeve due to the continuous mutual friction between the lower end of the mandrel and the mandrel female sleeve, and the hidden danger of loosening between the mandrel and the mandrel male sleeve can be caused by the lasting action of the interaction force.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the problem that the mandrels in the prior art are loosened due to continuous mutual friction after being used for a period of time.

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

an intermediate connecting portion;

the end part connecting sleeve is formed with an end part shaft hole which is a through hole;

the end part mandrel is sleeved in the end part shaft hole formed on the end part connecting sleeve and rotationally connects the middle connecting part and the end part connecting sleeve together with the same rotation axis;

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

Furthermore, the non-circular embedding structure comprises an embedding groove which is formed on the end face, facing the end mandrel, of the middle connecting part and is concave inwards along the rotation axis, and an embedding plug which is arranged on one end, facing the middle connecting part, of the end mandrel and is matched with the non-circular section of the embedding groove in an inserting and embedding mode.

Furthermore, the fixing structure comprises a connecting structure formed by the middle connecting part facing the fixing hole after the middle connecting part is embedded with the end mandrel, and a connecting piece which penetrates through the fixing hole and is connected with the connecting structure in a matching manner.

Furthermore, the connecting structure is a fixing screw hole formed in the middle connecting part, the connecting piece is a screw which penetrates through the round 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 shaft hole at the end part.

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

Further, the bearing mechanism has a pressure bearing.

Furthermore, the middle connecting part is provided with a middle connecting sleeve with a middle shaft hole and a middle mandrel rotatably 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 embedding 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.

Furthermore, a positioning mechanism at least with an opening position and a closing position is arranged between the middle connecting sleeve and the middle mandrel.

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

Further, the elastic clamping point comprises a mounting hole formed on the middle core shaft in the radial direction, a marble arranged in the mounting hole, and an elastic piece which applies a biasing force to the marble towards the inner wall direction of the middle shaft hole in the mounting 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 the rotating bearing is 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 part mandrel is provided with the fixing hole with the through hole, and the fixing structure penetrates through the fixing hole to fixedly connect the end part mandrel and the middle connecting part, so that the end part mandrel and the middle connecting part keep synchronous rotation through the non-circular embedding structure in the working process. And because the fixed structure is positioned in the fixed hole and the connecting sleeve of the hinge is positioned on the excircle side of the mandrel, the fixed structure is not in moving contact with the connecting sleeve of the hinge, and the fixed structure cannot be subjected to any friction action in the working process, thereby effectively overcoming the problem that the mandrel is loosened due to continuous mutual friction after being used for a period of time.

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 opening and closing action is easier.

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

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below.

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

FIG. 2 is an assembled partial cross-sectional view of the 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 an assembled partial cross-sectional view of the embodiment of FIG. 3;

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

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

Description of reference numerals:

1-middle connecting part, 2-end shaft hole, 3-end connecting sleeve, 4-end mandrel, 5-embedded claw, 6-fixing hole, 7-fixing 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-sliding groove and 21-bulge.

Detailed Description

The technical scheme of the invention is clearly and completely described in the following with reference to the accompanying drawings.

Fig. 1 and 2 show an embodiment of a hinge structure of the present invention, which includes an intermediate connecting portion 1 fixed to a mounting blade on one side of a hinge, an end connecting sleeve 3 having an end shaft hole 2 formed in a through hole form and fixed to a mounting blade on the other side of the hinge, and an end mandrel 4 sleeved on the end connecting sleeve 3. In this embodiment, each of the mounting blades has one intermediate connection portion 1 and one end connection sleeve 3. The end mandrel 4 connects the intermediate connection part 1 and the end connection sleeve 3 together in a rotating manner with the same axis of rotation. And a non-circular embedded structure for limiting the rotation of the end part core shaft 4 and the middle connecting part 1 along the rotation axis of the hinge is arranged between the end part core shaft and the middle connecting part. 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 part core shaft 4 is formed with a fixing hole 6 of a through hole, and comprises a fixing screw hole 7 which is formed at the position of the fixing hole 6 and is used as a connecting structure after the middle connecting part 1 is embedded with the end part core shaft 4, and a screw 8 which is used as a connecting piece and penetrates through the fixing hole 6 and is matched and connected with the fixing screw hole 7. The screw 8 pass circular through-hole the fixed orifices 6 with the cooperation of fixed screw 7 spiro union will tip dabber 4 with intermediate junction portion 1 fixed connection, the nut of screw 8 is less than the minimum radial dimension in tip shaft hole 2, in this embodiment, the diameter of nut is less than the diameter in tip shaft hole 2.

During assembly, the intermediate connecting part 1 fixed on the blade on one side of the hinge and the end connecting sleeve 3 fixed on the blade on one side of the hinge are matched and placed together with the rotating axis of the hinge. The end part mandrel 4 penetrates through the end part shaft hole 2 on the end part connecting sleeve 3, and the end part mandrel 4 is correspondingly matched and connected with the embedded tooth claw 5 between the middle connecting part 1 in an embedded mode. And then, the screw 8 is threaded with the fixing screw hole 7 formed on the intermediate connecting part 1 through the fixing hole 6 on the end mandrel 4, so that the end mandrel 4 and the intermediate connecting part 1 are fixed.

In use, the friction force around the rotation axis generated by the opening and closing action of the hinge 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. Since the engaging claws 5 protruding toward each other along the rotation axis on the opposite end surfaces between the end mandrel 4 and the intermediate connecting part 1 are used for limiting the rotation of the end mandrel 4 relative to the intermediate connecting part 1 around the rotation axis, the friction force generated by the hinge opening and closing action is limited between the end connecting sleeve 3 and the end mandrel 4, and the screw 8 passing through the fixing hole 6 on the end mandrel 4 is located in the end mandrel 4, and the diameter of the nut is smaller than that 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 connecting part 1 does not have any influence on the screwed connection and fixation of the screw 8 in the fixing screw hole 7 on the intermediate connecting part 1. In the using process, the screw 8 always enables the embedded tooth claw 5 between the end part core shaft 4 and the middle connecting part 1 to be in compression fit with each other, and the embedded tooth claw 5 prevents the friction force of the end part connecting sleeve 3 on the end part core shaft 4 from driving the end part core shaft 4 to rotate relative to the middle connecting part 1. This avoids the problem of the opening and closing action of the hinge causing the end mandrels 4 to loosen relative to the intermediate connection 1.

In the above embodiment, in order to reduce the frictional resistance of the switch fan body, a pressure bearing 9 as a bearing mechanism may be further 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 of the present invention is shown, wherein the intermediate connecting portion 1 is composed of an intermediate connecting sleeve 11 formed with an intermediate shaft hole 10 and an intermediate spindle 12 rotatably disposed in the intermediate shaft hole 10. The end connecting sleeve 3 still has an end shaft hole 2 formed in a through hole form, and the end mandrel 4 is sleeved in the end shaft hole 2 formed in 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 number of the end connecting sleeves 3 is two, and the two end connecting sleeves are respectively positioned at two ends of the middle connecting sleeve 11 and fixedly connected to the other side blade of the hinge. The middle connecting sleeve 11 rotates around the same rotation axis relative to the middle mandrel 12 and the end connecting sleeve 3 relative to the end mandrel 4, that is, the middle connecting part 1 and the end connecting sleeve 3 are rotationally connected together with the same rotation axis. A non-circular embedding structure for limiting the rotation of the end mandrel 4 and the middle mandrel 12 along the rotation axis of the hinge is arranged between the connection ends of the end mandrel 4 and the middle mandrel 12, and in this embodiment, the non-circular embedding structure comprises an embedding groove 13 which is formed on the end surface of the middle mandrel 12 facing the end mandrel 4 and is concave inwards along the rotation axis, and an embedding plug 14 which is arranged on one end of the end mandrel 4 facing the middle mandrel 12 and is matched with the non-circular section of the embedding groove 13 for embedding. The end part core shaft 4 is formed with a fixing hole 6 of a through hole, after the middle core shaft 12 is embedded with the end part 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 of the circular through hole to be in threaded fit with the fixing screw hole 7 to fixedly connect the end part 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 connecting portion 1 is provided on the intermediate mandrel 12. The head 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.

Similarly, in order to reduce the frictional resistance of the switching fan body, the bearing mechanism may be disposed between the intermediate connecting portion 1 and the end connecting sleeve 3, and in this embodiment, the bearing mechanism has a pressure bearing 9 disposed between the intermediate connecting sleeve 11 and the end connecting sleeve 3 and bearing pressure; and a rotating bearing 15 arranged between the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11 and the middle mandrel 12.

In the present embodiment, the middle core shaft 12 is inserted into the middle shaft hole 10 of the middle connecting sleeve 11 during assembly. Then, the rotating bearings 15 are placed at two ends of the middle shaft hole 10, and the two pressure bearings 9 are placed at two ends of the middle connecting sleeve 11. The end connection sleeves 3 are then placed together in co-operation with the centre connection sleeve 11 in line with the axis of rotation of the hinge. And then the end part mandrel 4 passes through the end part shaft hole 2 on the end part connecting sleeve 3, and the embedded plug 14 on the end part mandrel is correspondingly matched and embedded and connected with the embedded groove 13 on the middle mandrel 12. And then the screw 8 is threaded through the fixing hole 6 on the end mandrel 4 and a fixing screw hole 7 formed on the intermediate connecting part 1, so that the end mandrel 4 and the intermediate mandrel 12 are fixed together. Since the diameter of the middle mandrel 12 is larger than the inner diameter of the end shaft hole 2, after the end mandrel 4 and the middle mandrel 12 are fixed together, the combined mandrels cannot axially move, so that the middle mandrel 12 and the end mandrel 4 are held in the middle connecting sleeve 11 and the end connecting sleeve 3.

In use, the end connector housings 3 are rotatable about the end mandrels 4 and the intermediate connector housings 11 are also rotatable about the intermediate mandrels 12. The friction force around the rotation axis circumference generated by the opening and closing action of the hinge 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, and also exists between the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11 and the outer wall of the middle mandrel 12. Since the fitting plugs 14 of the end mandrels 4 are fitted and inserted into the insertion grooves 13 on the opposite end faces of the intermediate mandrel 12, the end mandrel 4 is restricted from rotating about the axis of rotation relative to the intermediate mandrel 12, therefore, the friction force generated by the opening and closing action of the hinge is limited to the screw 8 which passes through the fixing hole 6 on the end mandrel 4 between the end connecting sleeve 3 and the end mandrel 4 and between the middle connecting sleeve 11 and the middle mandrel 12, because the end part core shaft 4 is arranged in the inner part and the diameter of the nut is smaller than that of the end part shaft hole 2 of the end part connecting sleeve 3, the rotation of the end connection sleeve 3 relative to the intermediate mandrel 12 therefore has no effect on the screw-fastening of the screw 8 in the fastening screw hole 7 in the intermediate mandrel 12. In the using process, the screw 8 always enables the embedded tooth claw 5 between the end part core shaft 4 and the middle core shaft 12 to be in compression fit with each other, and the embedded tooth claw 5 prevents the friction force of the end part connecting sleeve 3 on the end part core shaft 4 from driving the end part core shaft 4 to rotate relative to the middle core shaft 12. This avoids the problem of the opening and closing action of the hinge causing the end mandrels 4 to loosen relative to the intermediate mandrel 12.

Referring to fig. 5, an alternative embodiment based on the embodiment shown in fig. 3 and 4. Wherein, the end connecting sleeve 3 and the end mandrel 4 are replaced by non-circular cross sections matched with each other. And at least a positioning mechanism of an open position and a closed position is arranged between the middle connecting sleeve 11 and the middle mandrel 12. In this embodiment, the positioning mechanism includes an elastic clamping point disposed on the middle core shaft 12 and a clamping groove 16 disposed on the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11 and corresponding to the elastic clamping point. Referring to fig. 6, the elastic click includes a mounting hole 17 formed radially on the intermediate spindle 12, two balls 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 balls 18 in the mounting hole 17 in a direction toward an inner wall of the intermediate spindle hole 10. The locking groove 16 is arranged on the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11, and can be at two positions of closing and opening corresponding to two mounting blades of the hinge, or at one or more semi-opening positions between the two positions. In this embodiment, a limiting mechanism, which is composed of a sliding groove 20 formed on the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11 and a protrusion 21 arranged on the outer wall of the middle mandrel 12, is further arranged between the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11 and the outer wall of the middle mandrel 12, and the limiting mechanism limits the rotation of the hinge between the closed position and the open position.

In the assembly of this embodiment, before the assembly steps of the embodiment shown in fig. 3 and 4, the coil spring 19 is first inserted into the mounting hole 17, and then the two marbles 18 are inserted from the two ends of the mounting hole 17. The intermediate mandrel 12 thus assembled is then inserted 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, the end connection sleeve 3 and the end mandrel 4 are not rotatable, and only the intermediate connection sleeve 11 can rotate around the intermediate mandrel 12, because the end connection sleeve 3 and the end mandrel 4 have a non-circular cross section. Therefore, at any positioning position of the hinge, because the marble 18 on the middle mandrel 12 is clamped into the clamping groove 16 formed on the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11 under the action of the bias force of the coil spring 19, the middle mandrel 12 cannot be easily driven to rotate in the middle connecting sleeve 11 by slight external stress such as wind power. When two installation blades of the hinge are required to rotate relatively, acting force acting on the fan body drives the middle core shaft 12 to generate a relative rotation trend in the middle connecting sleeve 11, and the trend causes the groove edge part of the clamping groove 16 formed on the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11 to apply force to the marble 18 so that the marble retreats into the installation hole 17 against the biasing force of the spiral spring 19, thereby unlocking the middle core shaft 12 relative to the middle connecting sleeve 11. The intermediate mandrel 12 is further rotated relative to the intermediate connecting sleeve 11 until the balls 18 meet the locking groove 16 at another position and are ejected by the biasing force of the coil spring 19 and locked into the locking groove 16. When the middle mandrel 12 rotates to an open position relative to the middle connecting sleeve 11, the protrusion 21 on the outer wall of the middle mandrel 12 meets the sliding groove 20 on the inner wall of the middle shaft hole 10 of the middle connecting sleeve 11, thereby limiting the over-rotation of the middle mandrel 12 relative to the middle 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 should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.

Claims

1. A hinge structure comprising:

an intermediate connection part (1);

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

the end part core shaft (4) is sleeved in the end part shaft hole (2) formed on the end part connecting sleeve (3) and rotationally connects the middle connecting part (1) and the end part connecting sleeve (3) together by the same rotation axis;

it is characterized in that

The end part core shaft (4) and the middle connecting part (1) are provided with a non-circular embedded structure, the end part core shaft (4) is provided with a fixing hole (6) of a through hole, and one fixing structure penetrates through the fixing hole (6) to fixedly connect the end part core shaft (4) and the middle connecting part (1).

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

3. The hinge structure according to claim 1 or 2, wherein: the fixing structure comprises a connecting structure and a connecting piece, wherein the connecting structure is formed by the middle connecting part (1) facing the fixing hole (6) after the middle connecting part (1) is embedded with the end core shaft (4), and the connecting piece penetrates through the fixing hole (6) and is connected with the connecting structure in a matched mode.

4. The hinge structure according to claim 3, wherein: the connecting structure is formed by fixing screw holes (7) in the middle connecting portion (1), the connecting piece penetrates through the circular through hole, the fixing holes (6) are in threaded connection with the screws (8) of the fixing screw holes (7), and the nuts of the screws (8) are smaller than the minimum radial dimension of the end portion shaft holes (2).

5. The hinge structure according to any one of claims 1 to 4, wherein: and a bearing mechanism is arranged between the middle connecting part (1) and the end connecting sleeve (3).

6. The hinge structure according to claim 5, wherein: the bearing mechanism has a pressure bearing (9).

7. The hinge structure according to any one of claims 1 to 4, wherein: the middle connecting part (1) is provided with a middle connecting sleeve (11) formed with a middle shaft hole (10) and a middle mandrel (12) rotationally 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 embedding structure on the middle connecting part (1) is arranged on the middle mandrel (12).

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

9. The hinge structure according to claim 8, wherein: and a positioning mechanism at least with an open position and a closed position is arranged between the middle connecting sleeve (11) and the middle mandrel (12).

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

11. The hinge structure according to claim 10, wherein: the elastic clamping point comprises a mounting hole (17) formed on the middle mandrel (12) in the radial direction, a marble (18) arranged in the mounting hole (17), and an elastic piece which applies a biasing force to the marble (18) towards the inner wall direction of the middle shaft hole (10) in the mounting hole (17).

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

13. The hinge structure according to 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 the rotating bearing (15) is arranged between the inner wall of the middle shaft hole (10) of the middle connecting sleeve (11) and the middle mandrel (12).