A hinge structure

Abstract

The present invention provides a hinge structure, which includes a first connecting body, a second connecting body and a joint device. The first connecting body is configured to be connected to a door frame; the second connecting body is configured to be connected to a door leaf; the joint device is connected between the first connecting body and the second connecting body; the joint device includes a first connecting arm and a second connecting arm, and the first connecting arm and the second connecting arm are connected between the first connecting body and the second connecting body; and a relief groove is provided on the second connecting arm, the first connecting arm is arranged in the relief groove, the relief groove is adapted to the first connecting arm, along a first direction from the first connecting body to the second connecting body, the cross-sectional dimensions of the relief groove and the first connecting arm gradually decrease in a direction perpendicular to the first direction, so as to distribute the limited material with scientific force distribution, thereby enabling the hinge structure to generate the maximum bearing capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of hinges, and particularly to a hinge structure. Background Art

[0002] Generally, hinges are provided on household items such as cabinets and doors and windows in the market to enable them to be conveniently opened and closed.

[0003] The existing hidden hinge includes a first connecting body adapted to be embedded in a receiving cavity formed in a side post of a door for connecting with the side post of the door, and a second connecting body adapted to be embedded in a receiving cavity formed in a fan blade of the door for connecting with a door leaf of the door, and an engaging device for connecting the first connecting body and the second connecting body to each other. The engaging device allows relative movement between the first connecting body and the second connecting body between the closed state and the open state, so that the door leaf of the door can be closed and opened. Among them, the engaging device includes a first arm and a second arm, a first connecting rod and a second connecting rod. One end of the first arm is hinged to the first connecting body, the other end of the first arm is hinged to one end of the first connecting rod, and the other end of the first connecting rod is hinged to the second connecting body. Similarly, one end of the second arm is hinged to the second connecting body, the other end of the second arm is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the first connecting body. The first arm and the second arm cross each other, and at an appropriate intersection point, the first arm is hinged to the second arm through an intermediate hinge shaft. Thus, the first arm and the second arm hinged by the intermediate hinge shaft cooperate with the first connecting rod and the second connecting body to form a four-bar linkage mechanism, and at the same time, the first arm and the second arm hinged by the intermediate hinge shaft cooperate with the second connecting rod and the first connecting body to form another four-bar linkage mechanism. The linkage of these two four-bar linkage mechanisms defines the movement trajectory between the first connecting body and the second connecting body, ensuring that the opening and closing between the two door frames move along a predetermined trajectory.

[0004] However, the shapes of the first arm and the second arm in the above-mentioned hidden hinge both extend from the corresponding connecting body to the corresponding connecting rod with substantially equal cross-sectional shapes. When applied to security doors, such as in the field of safes, etc., the hinge needs to bear the weight of the relatively heavy door leaf. During use, the first arm and the second arm in the hinge are prone to deformation due to the action of the door leaf weight, resulting in the door leaf sagging due to the hinge deformation, which affects the opening and closing of the door leaf. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that in the existing hidden hinge, when applied to security doors, such as in the field of safes, etc., the hinge needs to bear the weight of the relatively heavy door leaf. During use, the first arm and the second arm in the hinge are prone to deformation due to the action of the door leaf weight, resulting in the door leaf sagging due to the hinge deformation, which affects the opening and closing of the door leaf.

[0006] To this end, the present invention provides a hinge structure, including:

[0007] A first connecting arm, one end of which is hingedly connected to the side column of the frame body, and the other end of which is hingedly connected to the fan body;

[0008] A second connecting arm, one end of which is hingedly connected to the fan body, and the other end of which is hingedly connected to the side column of the frame body;

[0009] A first connecting rod, one end of which is hinged to the side column of the frame body, and the other end of the first connecting rod is hingedly connected to one end of the second connecting arm that is hinged to the side column of the frame body;

[0010] A second connecting rod, one end of which is hinged to the fan body, and the other end of the second connecting rod is hingedly connected to one end of the first connecting arm that is hinged to the fan body;

[0011] An intermediate hinge shaft that hinges the middle parts of the first connecting arm and the second connecting arm (2) together;

[0012] A receiving cavity, which is composed of grooves respectively formed on the side column of the frame body and the fan body. In the closed state, the first connecting arm, the second connecting arm, the first connecting rod, the second connecting rod, and the intermediate hinge shaft are received in the receiving cavity formed by the buckling of the grooves on the side column of the frame body and the fan body;

[0013] The dimension of the hinged end of the first connecting arm and the side column of the frame body and the dimension of the hinged end of the second connecting arm and the fan body along the axial direction of the hinge shaft are greater than the dimensions of their respective other ends.

[0014] Optionally, the dimensions of the first connecting arm and the second connecting arm along the axial direction of the hinge shaft are continuously transitioned between the two ends.

[0015] Optionally, it further includes;

[0016] A first connecting body, which is hinged to the first connecting arm, and the first connecting arm is installed on the side column of the frame body through the first connecting body;

[0017] A second connecting body, which is hinged to the second connecting arm, and the second connecting arm is installed on the fan body through the second connecting body.

[0018] Optionally, it further includes

[0019] A first connecting rod, one end of which is hinged to the side column of the frame body, and the other end of the first connecting rod is hingedly connected to one end of the second connecting arm that is hinged to the side column of the frame body;

[0020] A second connecting rod, one end of which is hinged to the fan body, and the other end of the second connecting rod is hingedly connected to one end of the first connecting arm that is hinged to the fan body;

[0021] An intermediate hinge shaft that hinges the middle parts of the first connecting arm and the second connecting arm together;

[0022] The intermediate hinge shaft hinges the first connecting arm and the second connecting arm to cooperate with the first connecting rod and the side column of the frame, and the second connecting rod and the fan body respectively to form two four-bar linkages to limit the movement locus of the fan body relative to the side column of the frame.

[0023] Optionally, the first connecting body has a first housing cavity, one end of the first connecting rod hinged to the first connecting body and one end of the first connecting arm hinged to the first connecting body are both arranged in the first housing cavity, and the first connecting rod is arranged at one end of the first connecting arm away from the second connecting body;

[0024] The second connecting body has a second housing cavity, one end of the second connecting rod hinged to the second connecting body and one end of the second connecting arm hinged to the second connecting body are arranged in the second housing cavity, and the second connecting rod is arranged at one end of the second connecting arm away from the first connecting body.

[0025] Optionally, one side of the first housing cavity close to the second housing cavity is open, and one end of the first connecting rod hinged to the first connecting body and one end of the second connecting rod hinged to the second connecting body are arranged close to this opening.

[0026] Optionally, the first connecting arm and the second connecting arm are bent along the extending direction.

[0027] Optionally, at the hinge where the first connecting arm and the second connecting arm are connected to the intermediate hinge shaft, the acting surfaces of the first connecting arm and the second connecting arm facing each other are perpendicular to the axis of the intermediate hinge shaft

[0028] and / or

[0029] At the hinge where the first connecting arm is connected to the first connecting body, the acting surfaces of the two facing each other are perpendicular to the hinge shaft connecting the two; at the hinge where the second connecting arm is connected to the second connecting body, the acting surfaces of the two facing each other are perpendicular to the hinge shaft connecting the two.

[0030] Optionally, the continuous transition between the acting surface of the first connecting arm at the connection with the first connecting body and the acting surface at the connection with the intermediate hinge shaft is a linear transition;

[0031] The continuous transition between the acting surface of the second connecting arm at the connection with the second connecting body and the acting surface at the connection with the intermediate hinge shaft is a linear transition to match the first connecting arm.

[0032] Optionally, the continuous transition between the acting surface of the first connecting arm at the connection with the intermediate hinge shaft and the acting surface at the connection with the second connecting rod is a linear transition;

[0033] The continuous transition between the working surface where the second connecting arm is connected to the intermediate hinge shaft and the working surface where the second connecting arm is connected to the first connecting rod is a linear transition to adapt to the first connecting arm.

[0034] The hinge structure provided by the present invention has the following advantages:

[0035] 1. The present invention provides a hinge structure, including a first connecting arm, a second connecting arm and a receiving cavity. One end of the first connecting arm is hingedly connected to the side column of the frame body, and the other end is hingedly connected to the fan body. One end of the second connecting arm is hingedly connected to the fan body, and the other end is hingedly connected to the side column of the frame body. The receiving cavity is composed of grooves respectively formed on the side column of the frame body and the fan body. In the closed state, the first connecting arm, the second connecting arm, the first connecting rod, the second connecting rod and the intermediate hinge shaft are received in the receiving cavity formed by the grooves on the side column of the frame body and the fan body being buckled together. The dimensions of the hinged ends of the first connecting arm and the side column of the frame body and the hinged ends of the second connecting arm and the fan body along the axial direction of the hinge shaft are greater than the dimensions of their respective other ends.

[0036] For the hinge structure of this structure, the first connecting arm is connected between the side column of the frame body and the fan body, and the second connecting arm is connected between the fan body and the side column of the frame body. In the closed state, the first connecting arm, the second connecting arm, the first connecting rod, the second connecting rod and the intermediate hinge shaft are received in the receiving cavity formed by the grooves on the side column of the frame body and the fan body being buckled together, thereby realizing the opening and closing of the fan body. By setting the dimensions of the hinged ends of the first connecting arm and the side column of the frame body and the hinged ends of the second connecting arm and the fan body along the axial direction of the hinge shaft to be greater than the dimensions of their respective other ends. Compared with the prior art in which the abutting surfaces of the first connecting arm and the second connecting arm are arranged parallel to each other, the present invention can increase the lifting force of the first connecting arm on the second connecting arm, and can reduce the deformation of the first connecting arm and the second connecting arm in the hinge due to the weight of the door leaf during use, resulting in the situation that the door leaf sags due to the deformation of the hinge and affects the opening and closing of the door leaf.

[0037] 2. The present invention provides a hinge structure, further including a first connecting rod, a second connecting rod and an intermediate hinge shaft. One end of the first connecting rod is hingedly connected to the side column of the frame body, the other end of the first connecting rod is hingedly connected to one end of the second connecting arm connected to the side column of the frame body, one end of the second connecting rod is hingedly connected to the fan body, the other end of the second connecting rod is hingedly connected to one end of the first connecting arm connected to the fan body, and the intermediate hinge shaft hinges the middle parts of the first connecting arm and the second connecting arm together. The intermediate hinge shaft hinges the first connecting arm and the second connecting arm to cooperate with the first connecting rod and the side column of the frame body, and the second connecting rod and the fan body to form two four-bar linkages to limit the movement trajectory of the fan body relative to the side column of the frame body.

[0038] The hinge structure of this structure is such that the first connecting rod is hinged between the side column of the frame and the second connecting arm, the second connecting rod is hinged between the fan body and the first connecting arm, and the middle hinge shaft hinges the middle parts of the first connecting arm and the second connecting arm together. Furthermore, the first connecting arm and the second connecting arm on one side of the middle hinge shaft cooperate with the first connecting rod and the first connecting body to form a four-bar linkage mechanism, while the first connecting arm and the second connecting arm on the other side of the middle hinge shaft cooperate with the second connecting rod and the second connecting body to form another four-bar linkage mechanism, so as to limit the movement trajectory between the first connecting body and ensure that the fan body and the door frame open and close along a predetermined trajectory.

[0039] 3. The present invention provides a hinge structure. At the hinge joint where the first connecting arm is connected to the middle hinge shaft, the acting surfaces of the first connecting arm and the second connecting arm that face each other are perpendicular to the axis of the middle hinge shaft. The continuous transition between the acting surface of the first connecting arm where it connects the first connecting body and the acting surface where it connects the middle hinge shaft is a linear transition; the continuous transition between the acting surface of the second connecting arm where it connects the second connecting body and the acting surface where it connects the middle hinge shaft is a linear transition to adapt to the first connecting arm.

[0040] For the hinge structure of this structure, by setting the acting surfaces of the first connecting arm and the second connecting arm that face each other perpendicular to the axis of the middle hinge shaft, and the continuous transition between the acting surface of the first connecting arm where it connects the first connecting body and the acting surface where it connects the middle hinge shaft is a linear transition, and the continuous transition between the acting surface of the second connecting arm where it connects the second connecting body and the acting surface where it connects the middle hinge shaft is a linear transition, so that when the first connecting arm and the second connecting arm intersect with each other, they can move more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a top view of the hinge structure provided in the embodiment of the present invention;

[0043] Figure 2 It is a schematic internal structure diagram of the hinge structure provided in the embodiment of the present invention;

[0044] Figure 3Schematic diagram of the second connecting body of the hinge structure provided in the embodiment of the present invention in the open state;

[0045] Figure 4 Another schematic diagram of the second connecting body of the hinge structure provided in the embodiment of the present invention in the open state;

[0046] Explanation of reference numerals:

[0047] 1 - First connecting arm;

[0048] 2 - Second connecting arm;

[0049] 3 - First connecting rod;

[0050] 4 - Second connecting rod;

[0051] 5 - First connecting body;

[0052] 6 - Second connecting body;

[0053] 7 - Intermediate hinge shaft. Detailed implementation manners

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] Embodiment

[0057] This embodiment provides a hinge structure, as Figures 1 to 4As shown, it includes a first connecting arm 1, a second connecting arm 2, a first connecting rod 3, a second connecting rod 4, a first connecting body 5, a second connecting body 6 and an intermediate hinge shaft 7. The first connecting body 5 is used to be embedded in the accommodating cavity formed in the side column of the door for connecting with the side column of the door, and the second connecting body 6 is used to be embedded in the accommodating cavity formed in the door leaf of the door for connecting with the door leaf of the door.

[0058] As Figure 1 and Figure 2 shown, one end of the first connecting rod 3 is hinged to the first connecting body 5, the other end of the first connecting rod 3 is hinged to one end of the second connecting arm 2, and the other end of the second connecting arm 2 is hinged to the second connecting body 6. One end of the second connecting rod 4 is hinged to the second connecting body 6, the other end of the second connecting rod 4 is hinged to one end of the first connecting arm 1, and the other end of the first connecting arm 1 is hinged to the first connecting body 5.

[0059] See Figure 1 and Figure 2 , the middle parts of the first connecting arm 1 and the second connecting arm 2 are hinged by the intermediate hinge shaft 7. Further, the first connecting arm 1 and the second connecting arm 2 on one side of the intermediate hinge shaft 7 cooperate with the first connecting rod 3 and the first connecting body 5 to form a four-bar linkage, while the first connecting arm 1 and the second connecting arm 2 on the other side of the intermediate hinge shaft 7 cooperate with the second connecting rod 4 and the second connecting body 6 to form another four-bar linkage, so as to limit the movement trajectory between the first connecting body 5 and the second connecting body 6 and ensure that the fan body and the door frame open and close along a predetermined trajectory.

[0060] Wherein, both between the first connecting arm 1 and the second connecting rod 4 and between the second connecting arm 2 and the first connecting rod 3 are hinged by hinge shafts, so that the first connecting arm 1 and the second connecting rod 4, and the second connecting arm 2 and the first connecting rod 3 can rotate relative to each other.

[0061] Further, as Figure 1 shown in the embodiment, the first connecting arm 1 is one and is arranged in the middle, and the second connecting arm 2 is two, which are respectively arranged on both sides of the first connecting arm 1 along the axial direction of the intermediate hinge shaft 7. The dimension of the end of the first connecting arm 1 close to the side column of the frame body and hinged to the first connecting body 5 along the axial direction of the intermediate hinge shaft 7 is larger than the dimension of the end hinged to the second connecting rod 4. The dimension of the end of the second connecting arm 2 close to the fan body and hinged to the second connecting body 6 along the axial direction of the intermediate hinge shaft 7 is larger than the dimension of the end hinged to the first connecting rod 3. And the dimensions of the first connecting arm 1 and the second connecting arm 2 along the axial direction of the intermediate hinge shaft 7 transition continuously between the two ends.

[0062] In the prior art, the abutting surfaces of the first connecting arm 1 and the second connecting arm 2 are arranged parallel to each other. In this embodiment, by setting the dimension of the end of the first connecting arm 1 near the side column of the frame body hinged to the first connecting body 5 along the axial direction of the middle hinge shaft 7 to be greater than the dimension of the end of the first connecting arm 1 hinged to the second connecting rod 4. The dimension of the end of the second connecting arm 2 near the fan body hinged to the second connecting body 6 along the axial direction of the middle hinge shaft 7 is greater than the dimension of the end of the second connecting arm 2 adhesively connected to the first connecting rod 3, and the dimensions of the first connecting arm 1 and the second connecting arm 2 along the axial direction of the middle hinge shaft 7 are continuously transitioned between the two ends.

[0063] As Figure 1 shown, in the present invention, the abutting part of the first connecting arm 1 and the second connecting arm 2 on the side close to the second connecting body 6 is changed from parallel to inclined plane support. When the hinge second connecting body 6 is subjected to the downward gravity of the door leaf, the gravity at b and c will transfer to the directions of a and d, so that the gravity remains unchanged and the force arm is increased, thereby increasing the relevant torque of the supporting force, enabling the hinge arm to exert greater lifting force and downward pulling force, and then distributing the limited materials with scientific force distribution, so that the hinge structure can generate greater bearing capacity.

[0064] As Figure 1 shown, at the hinge where the first connecting arm 1 and the second connecting arm 2 are connected to the middle hinge shaft 7, the opposite acting surfaces of the first connecting arm 1 and the second connecting arm 2 are perpendicular to the axis of the middle hinge shaft 7, that is, the opposite acting surfaces of the first connecting arm 1 and the second connecting arm 2 are parallel to each other, so that when the first connecting arm 1 and the second connecting arm 2 rotate relative to the middle hinge shaft 7, it is avoided that the opposite acting surfaces of the first connecting arm 1 and the second connecting arm 2 collide with each other, affecting the movement of the first connecting arm 1 and the second connecting arm 2.

[0065] Furthermore, the continuous transition between the acting surface of the first connecting arm 1 at the connection with the first connecting body 5 and the acting surface of the first connecting arm 1 at the connection with the middle hinge shaft 7 is a linear transition, that is, the acting surface of the first connecting arm 1 at the connection with the first connecting body 5 to the acting surface of the first connecting arm 1 at the connection with the middle hinge shaft 7 is a neat plane. And the continuous transition between the acting surface of the second connecting arm 2 at the connection with the second connecting body 6 and the acting surface of the second connecting arm 2 at the connection with the middle hinge shaft 7 is a linear transition to adapt to the first connecting arm 1, so that the first connecting arm 1 and the second connecting arm 2 can rotate more smoothly relative to the middle hinge shaft 7.

[0066] Similarly, the continuous transition between the acting surface of the first connecting arm 1 at the connection with the middle hinge shaft 7 and the acting surface of the first connecting arm 1 at the connection with the second connecting rod 4 is a linear transition, and the continuous transition between the acting surface of the second connecting arm 2 at the connection with the middle hinge shaft 7 and the acting surface of the second connecting arm 2 at the connection with the first connecting rod 3 is a linear transition to adapt to the first connecting arm 1.

[0067] And as Figure 2As shown, along the direction from the first connecting body 5 to the second connecting body 6, the cross-sections of the first connecting arm 1 and the second connecting arm 2 are arc-shaped.

[0068] As Figures 2 to 4 shown, the first connecting body 5 has a first housing cavity. One end of the first connecting rod 3 hinged to the first connecting body 5 and one end of the first connecting arm 1 hinged to the first connecting body 5 are both arranged in the first housing cavity, and the first connecting rod 3 is arranged at the end of the first connecting arm 1 far from the second connecting body 6. The second connecting body 6 has a second housing cavity. One end of the second connecting rod 4 hinged to the second connecting body 6 and one end of the second connecting arm 2 hinged to the second connecting body 6 are both arranged in the second housing cavity, and the second connecting rod 4 is arranged at the end of the second connecting arm 2 far from the first connecting body 5. One side of the first housing cavity and the second housing cavity close to each other is open, so as to reduce the overall volume of the hinge structure.

[0069] Specifically, when the fan body and the door frame are in the closed state, as Figure 2 shown, the part of the first connecting rod 3 and the first connecting arm 1 close to the first connecting rod 3 are both received in the first housing cavity, and the part of the second connecting rod 4 and the second connecting arm 2 close to the second connecting rod 4 are both received in the second housing cavity to reduce the overall volume of the hinge structure. At this time, the inclined surfaces of the first connecting arm 1 are separated from the inclined surfaces of the second connecting arms 2 on both sides of it.

[0070] As Figure 3 shown, when the fan body and the door frame are in the 90-degree open state, when the fan body and the door frame are in the state shown in Figure 2 shown and are converted to the state shown in Figure 3 shown, the first connecting arm 1 rotates around the hinge point with the first connecting body 5 and gradually extends out of the first housing cavity, and the second connecting arm 2 simultaneously rotates around the hinge point with the second connecting body 6 and gradually extends out of the second housing cavity. The first connecting rod 3 and the second connecting rod 4 also rotate around their respective hinge points accordingly. At this time, there is partial overlapping contact between the inclined surface of the first connecting arm 1 and the inclined surfaces of the second connecting arms 2 on both sides of it.

[0071] As Figure 4 shown, when the fan body and the door frame are in the 180-degree open state, when the fan body and the door frame are in the state shown in Figure 3 shown and are converted to the state shown in Figure 4 shown, the first connecting arm 1 continues to rotate around the hinge point with the first connecting body 5 until it completely extends out of the first housing cavity, and the second connecting arm 2 simultaneously continues to rotate around the hinge point with the second connecting body 6 until it completely extends out of the second housing cavity. The first connecting rod 3 and the second connecting rod 4 also rotate around their respective hinge points accordingly. At this time, the inclined surface of the first connecting arm 1 completely overlaps and contacts the inclined surfaces of the second connecting arms 2 on both sides of it.

[0072] In the above process from the state shown in Figure 2 shown to the state shown in Figure 4During the locking state process, since the acting surfaces of the first connecting arm 1 and the second connecting arm 2 facing each other are perpendicular to the axis of the middle hinge shaft 7, that is, the acting surfaces of the first connecting arm 1 and the second connecting arm 2 facing each other are parallel to each other, and the continuous transition between the acting surface of the first connecting arm 1 at the connection with the first connecting body 5 and the acting surface at its connection with the middle hinge shaft 7 is a linear transition, and the continuous transition between the acting surface of the second connecting arm 2 at the connection with the second connecting body 6 and the acting surface at its connection with the middle hinge shaft 7 is a linear transition. Furthermore, when the first connecting arm 1 and the second connecting arm 2 rotate relative to the middle hinge shaft 7, kinematic interference between the acting surfaces of the first connecting arm 1 and the second connecting arm 2 facing each other is avoided.

[0073] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A hinge structure, comprising: A first connecting arm (1), one end of which is hingedly connected to the side column of the frame body, and the other end is hingedly connected to the fan body; A second connecting arm (2), one end of which is hingedly connected to the fan body, and the other end is hingedly connected to the side column of the frame body; A first connecting rod (3), one end of which is hinged to the side column of the frame body, and the other end of the first connecting rod (3) is hingedly connected to one end of the second connecting arm (2) that is hingedly connected to the side column of the frame body; A second connecting rod (4), one end of which is hinged to the fan body, and the other end of the second connecting rod (4) is hingedly connected to one end of the first connecting arm (1) that is hingedly connected to the fan body; An intermediate hinge shaft (7), which hinges the middle parts of the first connecting arm (1) and the second connecting arm (2) together; A receiving cavity, which is composed of grooves respectively formed on the side column of the frame body and the fan body. In the closed state, the first connecting arm (1), the second connecting arm (2), the first connecting rod (3), the second connecting rod (4) and the intermediate hinge shaft (7) are received in the receiving cavity formed by the buckling of the grooves on the side column of the frame body and the fan body; It is characterized in that The dimension of the hinged end of the first connecting arm (1) with the side column of the frame body and the dimension of the hinged end of the second connecting arm (2) with the fan body along the axial direction of the intermediate hinge shaft (7) are larger than the dimensions of their respective other ends.

2. The hinge structure according to claim 1, It is characterized in that The dimensions of the first connecting arm (1) and the second connecting arm (2) along the axial direction of the intermediate hinge shaft (7) are continuously transitioned between the two ends.

3. The hinge structure according to claim 2, It is characterized in that It further includes; A first connecting body (5), which is hinged to the first connecting arm (1), and the first connecting arm (1) is installed on the side column of the frame body through the first connecting body (5); A second connecting body (6), which is hinged to the second connecting arm (2), and the second connecting arm (2) is installed on the fan body through the second connecting body (6).

4. The hinge structure according to claim 3, It is characterized in that The intermediate hinge shaft (7) hinges the first connecting arm (1) and the second connecting arm (2) respectively, and cooperates with the first connecting rod (3) and the side column of the frame body, and the second connecting rod (4) and the fan body to form two four-bar linkages to limit the movement trajectory of the fan body relative to the side column of the frame body.

5. The hinge structure according to claim 4, It is characterized in that The first connecting body (5) of the hinge structure has a first shell cavity. One end of the first connecting rod (3) hinged to the first connecting body (5) and one end of the first connecting arm (1) hinged to the first connecting body (5) are both arranged in the first shell cavity, and the first connecting rod (3) is arranged at one end of the first connecting arm (1) far from the second connecting body (6); The second connecting body (6) of the hinge structure has a second shell cavity. One end of the second connecting rod (4) hinged to the second connecting body (6) and one end of the second connecting arm (2) hinged to the second connecting body (6) are arranged in the second shell cavity, and the second connecting rod (4) is arranged at one end of the second connecting arm (2) far from the first connecting body (5).

6. The hinge structure according to claim 5, It is characterized in that one side of the first housing cavity close to the second housing cavity is open, and one end of the first connecting rod (3) hinged to the first connecting body (5) and one end of the second connecting rod (4) hinged to the second connecting body (6) are close to this opening.

7. The hinge structure according to any one of claims 4-6, It is characterized in that the first connecting arm (1) and the second connecting arm (2) are curved along the extending direction.

8. The hinge structure according to claim 3, It is characterized in that at the hinge where the first connecting arm (1) is connected to the middle hinge shaft (7), the acting surfaces of the first connecting arm (1) and the second connecting arm (2) opposite to each other are perpendicular to the axis of the middle hinge shaft (7) and / or at the hinge where the first connecting arm (1) is connected to the first connecting body (5), the acting surfaces of the two opposite to each other are perpendicular to the hinge shaft connecting the two; at the hinge where the second connecting arm (2) is connected to the second connecting body (6), the acting surfaces of the two opposite to each other are perpendicular to the hinge shaft connecting the two.

9. The hinge structure according to claim 8, It is characterized in that the continuous transition between the acting surface where the first connecting arm (1) is connected to the first connecting body (5) and the acting surface where it is connected to the middle hinge shaft (7) is a linear transition; the continuous transition between the acting surface where the second connecting arm (2) is connected to the second connecting body (6) and the acting surface where it is connected to the middle hinge shaft (7) is a linear transition to adapt to the first connecting arm (1).

10. The hinge structure according to claim 9, It is characterized in that the continuous transition between the acting surface where the first connecting arm (1) is connected to the middle hinge shaft (7) and the acting surface where the first connecting arm (1) is connected to the second connecting rod (4) is a linear transition; the continuous transition between the acting surface where the second connecting arm (2) is connected to the middle hinge shaft (7) and the acting surface where the second connecting arm (2) is connected to the first connecting rod (3) is a linear transition to adapt to the first connecting arm (1).

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