Hidden hinge

Abstract

The utility model discloses a hidden hinge which comprises a first hinge cup, a second hinge cup and a hinge arm set, containing cavities are formed in the first hinge cup and the second hinge cup respectively, the two ends of the hinge arm set are connected with the first hinge cup and the second hinge cup in a rotating mode respectively, and an assistance buffering mechanism is arranged between the second hinge cup and the hinge arm set. The power-assisted buffering mechanism comprises an outer shaft sleeve, an inner shaft sleeve, a transmission shaft, a spring and a damper, the outer shaft sleeve, the inner shaft sleeve and the transmission shaft are adopted as acting force linkage pieces, the overall structure of the hidden hinge is further simplified, the production cost is reduced, acting force is transmitted to the spring and the damper, and the service life of the hinge is prolonged. When the hinge is closed and opened, the spring provides door closing elastic assistance for the hinge, and the damper provides door closing buffering for the hinge. According to the hidden hinge structure, the production requirements of parts are low, the assembly structure is simpler, the production and assembly cost is lower than that of a traditional hidden hinge, and enterprise development is better facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware accessories, in particular to a concealed hinge. Background Art

[0002] Concealed door hinges are a type of hinge widely used in furniture, cabinets, and interior doors. Their characteristic is that after installation, the hinge portion is concealed within the door and door frame, thus not affecting the door's appearance. Traditional concealed door hinges primarily rely on mechanical structures to achieve door opening and closing. While this relatively simple structure can meet basic opening and closing requirements, it lacks a buffering function when the door closes. This makes the door susceptible to sudden impacts, shortening the service life of the door and door frame. Therefore, concealed door hinges with a buffering function have been developed.

[0003] For example, the Chinese patent publication document with application publication number CN209277731U proposes a concealed self-closing hinge structure with buffer, which includes a fixed base 1, a motor body 2 and a linkage assembly 3. The fixed base 1 is screwed to the door frame, and the motor body 2 includes a motor base 21, a cover plate 22 and a cam elastic pressing mechanism 23. The motor base 21 is provided with a horizontal slide groove 211 and a vertical slide groove 212; the cam elastic pressing mechanism 23 includes a horizontal slider 233, a longitudinal slider 234, a cam 231, a spring 232, a damper 235, a cam connecting shaft 236 and a damper connecting shaft 237. The horizontal slider 233 is installed in the horizontal slide groove 211 of the motor base 21, and the longitudinal slide groove 212 is provided on the motor base 21. The slider 234 is installed in the vertical slide groove 212 of the engine base 21, the cam 231 is hinged in the engine base 21 through the cam connecting shaft 236, the spring 232 is pressed between the upper and lower longitudinal sliders 234, and the two ends of the damper 235 are respectively hinged in the damping groove 2341 of the upper and lower longitudinal sliders 234 through the damper connecting shaft 237; the cover plate 22 is screwed to the engine base 21, and the engine body 2 is installed on the door panel. The linkage assembly 3 includes a linkage block 31, a linkage fork 32, a linkage rod 33, a rotating shaft 34, a fixed machine base connecting shaft 35, a transverse slider connecting shaft 36, a linkage fork connecting shaft 37, a engine base connecting shaft 38, a linkage rod connecting shaft 39 and a spacer washer 30. One end of the linkage block 31 is hinged to the fixed machine base 1 via a rotating shaft 34; one end of the linkage rod 33 is hinged to the fixed machine base 1 via a fixed machine base connecting shaft 35, and the other end of the linkage rod 33 is hinged to the transverse slider 233 via a transverse slider connecting shaft 36; one end of the linkage fork 32 is hinged to the other end of the linkage block 31 via a linkage fork connecting shaft 37, and the other end of the linkage fork 32 is hinged to the engine base 21 via an engine base connecting shaft 38, and the middle end of the linkage fork 32 is hinged to the middle end of the linkage rod 33 via a linkage rod connecting shaft 39. The above two hinged parts are separated by a spacer washer 30;

[0004] Another example is a Chinese patent application publication with application publication number CN118309334A, which proposes a concealed door hinge with an automatic buffering function. To prevent the self-priming mechanism from closing the door too quickly, a buffering mechanism is provided between the second adjustment seat 5 and the fourth hinge arm 34. This mechanism includes an inclined push block 7 and a hydraulic damping cylinder 8. When the door is closed, the distance between the fourth hinge arm 34 and the second adjustment seat 5 decreases, and the inclined push block 7 on the fourth hinge arm presses against the hydraulic damping cylinder 8 on the second adjustment seat 5, generating a buffering damping force to prevent the door from being impacted by rapid closing.

[0005] The above two buffer structures with hidden hinges both have a disadvantage, that is, the structures are complex, which makes installation difficult; therefore, further improvement is needed. Utility Model Content

[0006] The purpose of the present invention is to provide a concealed hinge, which solves the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A concealed hinge comprises a first hinge cup, a second hinge cup and a hinge arm group, wherein the first hinge cup and the second hinge cup are both provided with a receiving cavity, and the two ends of the hinge arm group are rotatably connected to the first hinge cup and the second hinge cup respectively to realize the opening and closing of the hinge, and the hinge arm group is accommodated in the receiving cavity when the hinge is closed, wherein a power-assisting buffer mechanism is provided between the second hinge cup and the hinge arm group, and the power-assisting buffer mechanism comprises an outer shaft sleeve, an inner shaft sleeve, a transmission shaft, a spring and a damper, and the outer shaft sleeve is rotatably connected to the hinge arm group so that the power-assisting buffer mechanism is rotated between the hinge arm group and the hinge arm group. The inner sleeve is arranged in the outer sleeve, and both ends are connected to the second hinge cup. A rotating sleeve is rotatably arranged on the inner sleeve, and the rotating sleeve is connected to the outer sleeve so that the inner sleeve and the outer sleeve can rotate relative to each other. The transmission shaft is axially movable in the inner sleeve, and the spring and the damper are respectively arranged at both ends of the transmission shaft, and the two ends of the transmission shaft are respectively in contact with the spring and the damper. When the rotating sleeve rotates, the transmission shaft is driven to move axially, so that the spring provides it with elastic assistance for closing the door and the damper provides it with buffering for closing the door when the hinge is closed.

[0009] Preferably, the hinge arm group includes a first hinge arm, a second hinge arm and a third hinge arm, one end of the hinge arm is rotatably connected to the first hinge cup, and the other end is rotatably connected to one end of the second hinge arm, the other end of the second hinge arm is rotatably connected to the second hinge cup, one end of the third hinge arm is rotatably connected to the first hinge cup, and the other end is rotatably connected to the second hinge cup, and the middle part of the third hinge arm is rotatably connected to the middle part of the second hinge arm.

[0010] Preferably, an adjustment seat is provided on the second hinge cup, and two ends of the inner sleeve are rotatably connected to two ends of the adjustment seat.

[0011] Preferably, the inner sleeve includes an inner upper sleeve and an inner lower sleeve, the inner upper sleeve is connected to the inner lower sleeve, a first rotating groove is provided in an annular shape on the inner upper sleeve, and a second rotating groove is provided in an annular shape on the inner lower sleeve, the first rotating groove and the second rotating groove form a rotating cavity, and the rotating sleeve cooperates with the rotating cavity.

[0012] Preferably, a spiral groove is radially penetrated on the first rotating groove, and a sliding pin is radially penetrated on the transmission shaft. The sliding pin is movably matched with the spiral groove, and the end of the sliding pin is connected to the rotating sleeve, so that when the rotating sleeve rotates, the transmission shaft is driven to move linearly through the sliding pin.

[0013] Preferably, a linear long groove is provided on the wall surface of the rotating sleeve along the axial direction, and the end of the sliding pin is adapted to the linear long groove so that the sliding pin moves along the linear long groove.

[0014] Preferably, sliding bearings are provided at both ends of the rotating sleeve, and two sliding bearings are respectively sleeved on the first rotating groove and the second rotating groove.

[0015] Preferably, it also includes an elastic force adjustment mechanism and a damping adjustment mechanism, the spring is arranged in the inner lower sleeve, the elastic force adjustment mechanism drives the spring to move linearly in the inner lower sleeve, the damper is arranged in the inner lower sleeve, and the damping adjustment mechanism drives the damper to move linearly in the inner upper sleeve.

[0016] Preferably, the elastic force adjustment mechanism includes a first adjustment member, which is threaded into the inner lower sleeve and has an end portion in contact with the spring.

[0017] Preferably, the damping adjustment mechanism includes a second adjusting member, a third adjusting member and an adjusting bolt. The second adjusting member is movably arranged in the second hinge cup along the depth direction. The second adjusting member and the third adjusting member are provided with corresponding inclined surfaces. The adjusting bolt is rotatably arranged on the second hinge cup, and the adjusting bolt is threadedly connected to the second adjusting member so that the second adjusting member is driven to move along the height direction when the adjusting bolt rotates.

[0018] Compared with the existing technology, this technical solution provides a hidden hinge: by adopting an outer sleeve, an inner sleeve, and a transmission shaft as force linkage parts, the overall structure of the hidden hinge is further simplified, the production cost is reduced, and the force is transmitted to the spring and the damper. When the hinge is closed, the spring provides it with elastic assistance for closing the door and the damper provides it with closing buffer. The hidden hinge structure of the utility model not only has low requirements for the production of parts, but also has a simpler assembly structure. The production and assembly costs are lower than those of traditional hidden hinges, which is more conducive to enterprise development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a schematic diagram of the three-dimensional viewing angle structure of the utility model.

[0021] Figure 2 It is a schematic diagram of the splitting in the present utility model.

[0022] Figure 3 It is a structural diagram of the hinge arm group in the utility model.

[0023] Figure 4 It is an exploded schematic diagram of the hinge arm assembly in the utility model.

[0024] Figure 5 It is an exploded schematic diagram of the power-assisting buffer mechanism in the utility model.

[0025] Figure 6 It is a schematic diagram of the installation of the damping adjustment mechanism in the utility model.

[0026] As shown in the figure: the first hinge cup 10, the second hinge cup 20, the hinge arm group 30, the first hinge arm 301, the second hinge arm 302, the third hinge arm 303, the power-assisting buffer mechanism 40, the outer sleeve 41, the inner sleeve 42, the inner upper sleeve 42a, the inner lower sleeve 42b, the first rotating groove 421, the second rotating groove 422, the spiral groove 423, the transmission shaft 43, the spring 44, the damper 45, the rotating sleeve 46, the straight long groove 461, the sliding pin 47, the sliding bearing 48, the adjustment seat 50, the first adjusting member 60, the second adjusting member 70, the third adjusting member 80, and the adjusting bolt 90. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary persons in this field without making creative work are within the scope of protection of the present invention. The preferred embodiments of the present invention will be described in more detail below with reference to the drawings. Although the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described here. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] The terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the utility model. As used in this utility model and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0029] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0030] In the description of the present invention, it should be understood that the terms "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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 therefore cannot be understood as a limitation on the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various components in the present invention, this information should not be limited to these terms. These terms are only used to distinguish components of the same type from each other. For example, without departing from the scope of the present invention, the first component may also be referred to as the second component, and similarly, the second component may also be referred to as the first component. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] The technical solutions of the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0034] refer to Figures 1 to 6 A concealed hinge includes a first hinge cup 10, a second hinge cup 20 and a hinge arm assembly 30. The first hinge cup 10 and the second hinge cup 20 are each provided with an accommodating cavity. The two ends of the hinge arm assembly 30 are rotatably connected to the first hinge cup 10 and the second hinge cup 20 respectively to realize the opening and closing of the hinge. When the hinge is closed, the hinge arm assembly 30 is accommodated in the accommodating cavity.

[0035] A power-assist buffer mechanism 40 is provided between the second hinge cup 20 and the hinge arm group 30. The power-assist buffer mechanism 40 includes an outer sleeve 41, an inner sleeve 42, a transmission shaft 43, a spring 44 and a damper 45. The outer sleeve 41 is rotatably connected to the hinge arm group 30 so that the power-assist buffer mechanism 40 interacts with the hinge arm. The inner sleeve 42 is provided in the outer sleeve 41 and connected to the second hinge cup 20 at both ends. A rotating sleeve 46 is rotatably provided on the inner sleeve 42. The rotating sleeve 46 is connected to the outer sleeve 41 so that the inner sleeve 42 and the outer sleeve 41 rotate relative to each other. The transmission shaft 43 is axially movable in the inner sleeve 42. The spring 44 and the damper 45 are respectively provided at both ends of the transmission shaft 43. The two ends are respectively in contact with the spring 44 and the damper 45. When the rotating sleeve 46 rotates, it drives the transmission shaft 43 to move axially, so that the spring 44 provides it with elastic closing assistance and the damper 45 provides it with door closing buffer when the hinge is closed or opened; the outer sleeve 41, the inner sleeve 42, and the transmission shaft 43 act as force linkage parts, further simplifying the overall structure of the hidden hinge and reducing production costs, and the force is transmitted to the spring 44 and the damper 45, so that the spring 44 provides it with elastic closing assistance and the damper 45 provides it with door closing buffer when the hinge is closed or opened; the hidden hinge structure of the utility model not only has low requirements for component production, but also has a simpler assembly structure, and the production and assembly costs are lower than those of traditional hidden hinges, which is more conducive to enterprise development.

[0036] Specifically, the hinge arm group 30 includes a first hinge arm 301, a second hinge arm 302 and a third hinge arm 303, one end of the hinge arm is rotatably connected to the first hinge cup 10, and the other end is rotatably connected to one end of the second hinge arm 302, the other end of the second hinge arm 302 is rotatably connected to the second hinge cup 20, one end of the third hinge arm 303 is rotatably connected to the first hinge cup 10, and the other end is rotatably connected to the second hinge cup 20, and the middle part of the third hinge arm 303 is rotatably connected to the middle part of the second hinge arm 302.

[0037] Specifically, an adjustment seat 50 is provided on the second hinge cup 20 , and two ends of the inner sleeve 42 are rotatably connected to two ends of the adjustment seat 50 .

[0038] Specifically, the inner sleeve 42 includes an inner upper sleeve 42a and an inner lower sleeve 42b, the inner upper sleeve 42a is connected to the inner lower sleeve 42b, a first rotation groove 421 is provided in an annular shape on the inner upper sleeve 42a, and a second rotation groove 422 is provided in an annular shape on the inner lower sleeve 42b, the first rotation groove 421 and the second rotation groove 422 form a rotation cavity, and the rotating sleeve 46 cooperates with the rotation cavity.

[0039] Specifically, a spiral groove 423 is radially penetrated on the first rotating groove 421, and a sliding pin 47 is radially penetrated on the transmission shaft 43. The sliding pin 47 is movably matched with the spiral groove 423, and the end of the sliding pin 47 is connected to the rotating sleeve 46, so that when the rotating sleeve 46 rotates, the transmission shaft 43 is driven to move linearly through the sliding pin 47.

[0040] Specifically, a linear long groove 461 is provided on the wall surface of the rotating sleeve 46 along the axial direction, and the end of the sliding pin 47 is adapted to the linear long groove 461 so that the sliding pin 47 moves along the linear long groove 461 .

[0041] Specifically, sliding bearings 48 are provided at both ends of the rotating sleeve 46 , and the two sliding bearings 48 are respectively sleeved on the first rotating groove 421 and the second rotating groove 422 .

[0042] Specifically, it also includes an elastic force adjustment mechanism and a damping adjustment mechanism. The spring 44 is arranged in the inner lower sleeve 42b, and the elastic force adjustment mechanism drives the spring 44 to move linearly in the inner lower sleeve 42b. The damper 45 is arranged in the inner lower sleeve 42b, and the damping adjustment mechanism drives the damper 45 to move linearly in the inner upper sleeve 42a.

[0043] Specifically, the elastic force adjustment mechanism includes a first adjustment member 60, which is screwed into the inner lower sleeve 42b and has its end in contact with the spring 44; this structure is a common technology in this field, so it will not be analyzed in detail.

[0044] To be precise, the damping adjustment mechanism includes a second adjusting member 70, a third adjusting member 80 and an adjusting bolt 90. The second adjusting member 70 is movably arranged in the second hinge cup 20 along the depth direction. The second adjusting member 70 and the third adjusting member 80 are both provided with corresponding inclined surfaces. The adjusting bolt 90 is rotatably arranged on the second hinge cup 20, and the adjusting bolt 90 is threadedly connected to the second adjusting member 70 so that when the adjusting bolt 90 rotates, the second adjusting member 70 is driven to move along the height direction. This structure is a common technology in this field, so it will not be analyzed in detail.

[0045] The scheme of the present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphases. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for the present invention. In addition, it can be understood that the steps in the method of the embodiment of the present invention can be adjusted in sequence, merged and deleted according to actual needs, and the structures in the device of the embodiment of the present invention can be merged, divided and deleted according to actual needs.

[0046] While various embodiments of the present invention have been described above, the above descriptions are illustrative and non-exhaustive, and are not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A concealed hinge, comprising a first hinge cup (10), a second hinge cup (20) and a hinge arm assembly (30), wherein the first hinge cup (10) and the second hinge cup (20) are both provided with a receiving cavity, and the two ends of the hinge arm assembly (30) are respectively rotatably connected to the first hinge cup (10) and the second hinge cup (20) to realize the opening and closing of the hinge, and the hinge arm assembly (30) is accommodated in the receiving cavity when the hinge is in a closed state, characterized in that: A power-assistance buffer mechanism (40) is provided between the second hinge cup (20) and the hinge arm assembly (30), and the power-assistance buffer mechanism (40) comprises an outer sleeve (41), an inner sleeve (42), a transmission shaft (43), a spring (44) and a damper (45). The outer sleeve (41) is rotatably connected to the hinge arm assembly (30) so that the power-assistance buffer mechanism (40) interacts with the hinge arm. The inner sleeve (42) is provided in the outer sleeve (41) and is connected to the second hinge cup (20) at both ends. A rotating sleeve (46) is rotatably provided on the inner sleeve (42). The rotating sleeve (46) is connected to the outer sleeve (41) so that the inner sleeve (42) and the outer sleeve (41) rotate relative to each other. The transmission shaft (43) is axially movable in the inner sleeve (42). The spring (44) and the damper (45) are respectively arranged at both ends of the transmission shaft (43), and the two ends of the transmission shaft (43) are respectively in contact with the spring (44) and the damper (45). When the rotating sleeve (46) rotates, the transmission shaft (43) is driven to move axially, so that when the hinge is closed, the spring (44) provides it with elastic assistance for closing the door and the damper (45) provides it with buffering for closing the door.

2. The concealed hinge according to claim 1, characterized in that: The hinge arm group (30) comprises a first hinge arm (301), a second hinge arm (302) and a third hinge arm (303); one end of the hinge arm is rotatably connected to the first hinge cup (10), and the other end is rotatably connected to one end of the second hinge arm (302); the other end of the second hinge arm (302) is rotatably connected to the second hinge cup (20); one end of the third hinge arm (303) is rotatably connected to the first hinge cup (10), and the other end is rotatably connected to the second hinge cup (20); the middle part of the third hinge arm (303) is rotatably connected to the middle part of the second hinge arm (302).

3. The concealed hinge according to claim 1, characterized in that: An adjustment seat (50) is provided on the second hinge cup (20), and two ends of the inner shaft sleeve (42) are rotatably connected to two ends of the adjustment seat (50).

4. The concealed hinge according to claim 3, characterized in that: The inner shaft sleeve (42) comprises an inner upper shaft sleeve (42a) and an inner lower shaft sleeve (42b), wherein the inner upper shaft sleeve (42a) is connected to the inner lower shaft sleeve (42b), a first rotating groove (421) is provided in an annular shape on the inner upper shaft sleeve (42a), and a second rotating groove (422) is provided in an annular shape on the inner lower shaft sleeve (42b), wherein the first rotating groove (421) and the second rotating groove (422) form a rotating cavity, and the rotating sleeve (46) cooperates with the rotating cavity.

5. The concealed hinge according to claim 4, characterized in that: A spiral groove (423) is radially passed through the first rotating groove (421), and a sliding pin (47) is radially passed through the transmission shaft (43). The sliding pin (47) is movably matched with the spiral groove (423), and the end of the sliding pin (47) is connected to the rotating sleeve (46), so that when the rotating sleeve (46) rotates, the transmission shaft (43) is driven to move linearly through the sliding pin (47).

6. The concealed hinge according to claim 5, characterized in that: A linear long groove (461) is provided on the wall surface of the rotating sleeve (46) along the axial direction, and the end of the sliding pin (47) is adapted to the linear long groove (461) so that the sliding pin (47) moves along the linear long groove (461).

7. The concealed hinge according to claim 4, characterized in that: Both ends of the rotating sleeve (46) are provided with sliding bearings (48), and the two sliding bearings (48) are respectively sleeved on the first rotating groove (421) and the second rotating groove (422).

8. The concealed hinge according to claim 4, characterized in that: The invention also includes an elastic force adjustment mechanism and a damping adjustment mechanism, wherein the spring (44) is arranged in the inner lower shaft sleeve (42b), and the elastic force adjustment mechanism drives the spring (44) to move linearly in the inner lower shaft sleeve (42b); the damper (45) is arranged in the inner lower shaft sleeve (42b), and the damping adjustment mechanism drives the damper (45) to move linearly in the inner upper shaft sleeve (42a).

9. The concealed hinge according to claim 8, characterized in that: The elastic force adjustment mechanism comprises a first adjustment member (60), wherein the first adjustment member (60) is screwed into the inner lower sleeve (42b), and the end portion thereof abuts against the spring (44).

10. The concealed hinge according to claim 8, characterized in that: The damping adjustment mechanism comprises a second adjustment member (70), a third adjustment member (80) and an adjustment bolt (90); the second adjustment member (70) is movably arranged in the second hinge cup (20) along the depth direction; the second adjustment member (70) and the third adjustment member (80) are both provided with corresponding inclined surfaces; the adjustment bolt (90) is rotatably arranged on the second hinge cup (20), and the adjustment bolt (90) is threadedly connected to the second adjustment member (70) so that when the adjustment bolt (90) rotates, the second adjustment member (70) is driven to move along the height direction.

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