Concealed hinge capable of realizing rotation angle positioning

Abstract

The utility model provides a blind hinge capable of realizing rotation angle positioning, which comprises a rotating arm main body, and a door frame side fixing seat component and a door leaf side fixing seat component are respectively arranged at two ends of the rotating arm main body. The blind hinge capable of achieving rotation angle positioning has the advantages of being high in stability, convenient to adjust, capable of achieving 90-degree opening positioning and the like, and has extremely high stability through unique structural design in the design process; and meanwhile, by matching with adjustment of the door frame side fixing seat assembly and the door leaf side fixing seat assembly, the using process is very convenient and fast, more importantly, angle positioning can be achieved, and the effect which cannot be achieved in the prior art is achieved, so that the door frame side fixing seat assembly has great economic value and practical value.

Description

Technical Field

[0001] The utility model relates to the technical field of hinge design, in particular to a concealed hinge capable of realizing rotation angle positioning. Background Art

[0002] Hinge is a rotating mechanical device used to connect door frame and door leaf. It can be seen everywhere in our daily life and is an essential hardware for our daily life. Hinge can be composed of movable components or foldable materials. Hinges are mostly installed on cabinets. They are mainly divided into stainless steel hinges and iron hinges according to the material classification. Hinges are generally composed of an adjustment base and a rocker arm assembly. They rotate with the opening and closing of the door. Then, with the development of science and technology, the function of hinges is constantly improving, and the needs of society are also constantly increasing. Most of the hinges in the existing technology have no way to achieve positioning operations. Therefore, further improvement is needed. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a concealed hinge which has strong stability, is easy to adjust, can be opened to 90 degrees and can realize rotation angle positioning.

[0004] The technical solution adopted by the utility model to solve the above problems is:

[0005] The utility model provides a concealed hinge capable of realizing rotation angle positioning, comprising a rotating arm main body, wherein two ends of the rotating arm main body are respectively provided with a door frame side fixing seat component and a door leaf side fixing seat component.

[0006] Furthermore, one end of the rotating arm body is provided with a first rotating shaft hole and a fixed limiting groove.

[0007] The other end is provided with an opening and closing sequence plate mounting hole, an air-avoiding groove and a second rotating shaft hole.

[0008] A connecting rod A and a sliding column assembly are installed in the first rotating shaft hole and the fixed limiting groove respectively, and the connecting rod A and the sliding column assembly are connected to the door frame side fixing seat assembly.

[0009] A first connecting shaft is installed in the opening and closing sequence plate installation hole, a second connecting shaft is installed in the second rotating shaft hole, and the second connecting shaft is connected to the door leaf side fixing seat assembly.

[0010] Furthermore, opening and closing sequence plates are provided on both sides of the rotating arm body, and the opening and closing sequence plates are provided with positioning grooves, limiting groove structures A, installation holes, rivet installation positions and limiting groove structures B.

[0011] The positioning groove cooperates with the sliding column assembly.

[0012] The mounting hole matches the first connecting shaft.

[0013] A rivet is installed on the rivet installation position, and a wear-resistant part is installed on the rivet.

[0014] Furthermore, the door leaf side fixing seat assembly includes a door leaf fixing seat connected to the second connecting shaft,

[0015] The door leaf fixing seat is provided with a sliding guide piece and a door leaf adjusting structure.

[0016] The door leaf fixing seat and the sliding guide piece are connected to the door leaf adjustment structure through the sequential piece limit connecting piece A and the sequential piece limit connecting piece B.

[0017] The door leaf adjustment structure comprises a connecting guide rod disposed between the door leaf fixing seats and an upper and lower adjustment sleeve connected to the connecting guide rod via an adjustment screw.

[0018] The upper and lower adjustment sleeves are also provided with a machine screw installation position for installing the machine screw.

[0019] Left and right adjusting bolts are also installed inside the upper and lower adjusting sleeves, which abut against the machine screws to adjust the left and right directions.

[0020] Furthermore, the left and right adjusting bolts are provided with sealing grooves, and the sealing grooves are sleeved with sealing rings.

[0021] The ends of the left and right adjusting bolts are inclined plane structures, and the inclined plane of the inclined plane structure abuts against the machine screws.

[0022] Furthermore, the upper and lower adjustment sleeves and the connecting guide rod are respectively provided with a first adjustment screw installation position and a second adjustment screw installation position, and the adjustment screw passes through the first adjustment screw installation position and the second adjustment screw installation position in sequence and is fixed by a nut.

[0023] Furthermore, a bearing is provided between the door leaf fixing seat and the second connecting shaft.

[0024] Furthermore, the door frame side fixing seat assembly includes door frame side fixing seats, and the door frame side fixing seats are connected by connecting rods.

[0025] A limit shift block is also installed on the door frame side fixing seat.

[0026] The limit shift block is provided with a spring installation position and a limit contact arc surface, and a spring is installed on the spring installation position.

[0027] The other end of the spring is provided with a limit force adjustment block.

[0028] The door frame side fixing seat is also provided with a limit shift block adjustment hole, the limit force adjustment block is installed in the limit shift block adjustment hole, and a force adjustment hole is also provided in communication with the limit shift block adjustment hole, a force adjustment screw is installed in the force adjustment hole, and a force adjustment screw hole is provided on the limit force adjustment block for installing the force adjustment screw.

[0029] The limit force adjustment block is also provided with a spring fixing column for inserting into the other end of the spring.

[0030] Furthermore, the connecting rod comprises a first connecting rod and a second connecting rod.

[0031] The door frame side fixing seat is provided with a limit block installation position, and a locking screw is installed in the limit block installation position. The locking screw passes through the limit block and is fixed by a nut.

[0032] The door frame side fixing seat is also provided with a sliding guide groove and a limiting fixing groove.

[0033] Furthermore, the door frame side fixing seat is also provided with a fixing hole, and the door frame side fixing screw is installed in the fixing hole.

[0034] The sliding column assembly includes a sliding column sleeve, and a first sliding column and a second sliding column are respectively installed at both ends of the sliding column sleeve. A sliding column thrust spring is installed in the sliding column sleeve, and the first sliding column and the second sliding column are respectively installed at both ends of the sliding column thrust spring, so that the sliding column thrust spring is in a compressed state.

[0035] The sliding guide piece is provided with a sliding guide arc groove, a limit fixing arc groove and a left and right adjustment avoidance arc groove, the sliding guide arc groove is connected to the limit fixing arc groove, the left and right adjustment avoidance arc groove and the sliding guide arc groove limit fixing arc groove are respectively arranged on both sides of the sliding guide piece,

[0036] A door leaf side mounting plate is also provided on one side of the door leaf side fixing seat assembly.

[0037] The beneficial effects of the utility model are:

[0038] The concealed hinge provided by the utility model can realize rotation angle positioning and has the advantages of strong stability, easy adjustment, and the ability to open to 90°. The unique structural design of the application makes the application extremely stable. At the same time, combined with the adjustment of the door frame side fixing seat assembly and the door leaf side fixing seat assembly, the use process is also very convenient. More importantly, the application can realize angle positioning, which is a function that cannot be achieved in the prior art. Therefore, the application has great economic value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a three-dimensional diagram of a concealed hinge capable of realizing rotation angle positioning of the utility model;

[0040] Figure 2 This is a partial structural diagram of a concealed hinge capable of realizing rotation angle positioning of the utility model;

[0041] Figure 3 This is another partial structural diagram of a concealed hinge capable of realizing rotation angle positioning of the utility model;

[0042] Figure 4 This is an exploded view of a concealed hinge capable of realizing rotation angle positioning of the utility model;

[0043] Figure 5 This is a partial exploded view of a concealed hinge capable of realizing rotation angle positioning of the utility model;

[0044] Figure 6 This is another partial exploded view of a concealed hinge capable of realizing rotation angle positioning according to the utility model;

[0045] Figure 7 This is a structural diagram of the opening and closing sequence piece of a concealed hinge that can realize rotation angle positioning in the utility model;

[0046] Figure 8 This is a main structural diagram of a rotating arm of a concealed hinge capable of realizing rotation angle positioning in the utility model;

[0047] Fig. 9 This is a structural diagram of a sliding guide piece of a concealed hinge capable of realizing rotation angle positioning in the utility model;

[0048] Fig.10 This is a structural diagram of a door frame side fixing seat of a concealed hinge capable of realizing rotation angle positioning in the utility model;

[0049] Fig.11 This is a structural diagram of a limit shifting block of a concealed hinge capable of realizing rotation angle positioning in the utility model;

[0050] Fig.12 This is an assembly diagram of a concealed hinge door frame side fixing seat assembly capable of realizing rotation angle positioning of the utility model;

[0051] Fig.13 The utility model discloses a door frame side fixing seat assembly structure of a concealed hinge capable of realizing rotation angle positioning;

[0052] Fig.14 This is a closed state diagram of a concealed hinge of the utility model that can realize rotation angle positioning;

[0053] Fig.15This is a state diagram of a concealed hinge opening 0-45° that can realize rotation angle positioning in the utility model;

[0054] Fig.16 This is a state diagram of the utility model that can realize the rotation angle positioning and is opened at 45-90°;

[0055] Fig.17 The utility model is a concealed hinge which can realize rotation angle positioning and is opened 180 degrees. DETAILED DESCRIPTION

[0056] The following is a detailed description of the implementation of the present invention in conjunction with the accompanying drawings, which are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention.

[0057] like Figure 1-6 As shown, this embodiment provides a concealed hinge capable of realizing rotation angle positioning, comprising a rotating arm body (1), wherein the two ends of the rotating arm body (1) are respectively provided with a door frame side fixing seat assembly (2) and a door leaf side fixing seat assembly (3).

[0058] In this embodiment, one end of the rotating arm body (1) is provided with a first rotating shaft hole (101) and a fixed limiting groove (102).

[0059] The other end is provided with an opening and closing sequence piece mounting hole (103), a clearance groove (104) and a second rotation shaft hole (105).

[0060] A connecting rod A (4) and a sliding column assembly (5) are respectively installed in the first rotating shaft hole (101) and the fixed limiting groove (102), and the connecting rod A (4) and the sliding column assembly (5) are connected to the door frame side fixing seat assembly (2).

[0061] A first connecting shaft (6) is installed in the opening and closing sequence plate installation hole (103), and a second connecting shaft (7) is installed in the second rotating shaft hole (105), and the second connecting shaft (7) is connected to the door leaf side fixing seat assembly (3).

[0062] like Figure 7 As shown, in this embodiment, both sides of the rotating arm body (1) are provided with opening and closing sequence pieces (8), and the opening and closing sequence pieces (8) are provided with positioning grooves (801), limiting groove structures A (802), installation holes (803), rivet installation positions (804) and limiting groove structures B (805).

[0063] The positioning groove (801) cooperates with the sliding column assembly (5).

[0064] The mounting hole (803) matches the first connecting shaft (6).

[0065] A rivet (806) is installed on the rivet installation position (804), and a wear-resistant part (807) is installed on the rivet.

[0066] In this embodiment, the door leaf side fixing seat assembly (3) comprises a door leaf fixing seat (9) connected to the second connecting shaft (7).

[0067] The door leaf fixing seat (9) is provided with a sliding guide plate (10) and a door leaf adjusting structure (11).

[0068] The door leaf fixing seat (9) and the sliding guide plate (10) are connected to the door leaf adjustment structure (11) via a sequential plate limiting connection piece A (12) and a sequential plate limiting connection piece B (13).

[0069] The door leaf adjustment structure (11) comprises a connecting guide rod (14) arranged between the door leaf fixing seats (9) and an upper and lower adjustment sleeve (16) connected to the connecting guide rod (14) via an adjustment screw (15).

[0070] The upper and lower adjustment sleeves (16) are also provided with a machine screw installation position (17) for installing a machine screw (18).

[0071] The upper and lower adjustment sleeve (16) is also internally provided with left and right adjustment posts (19) which abut against the machine screw (18) to adjust the upper and lower directions.

[0072] In this embodiment, a sealing groove (20) is provided on the upper and lower adjustment columns (19), and a sealing ring (21) is sleeved on the sealing groove (20).

[0073] The ends of the upper and lower adjustment columns (19) are inclined plane structures (191), and the inclined plane of the inclined plane structure (191) abuts against the machine screw (18).

[0074] In this embodiment, the upper and lower adjustment sleeves (16) and the connecting guide rod (14) are respectively provided with a first adjustment screw installation position (161) and a second adjustment screw installation position (141); the adjustment screw (15) passes through the first adjustment screw installation position (161) and the second adjustment screw installation position (141) in sequence and is fixed by a nut (22).

[0075] In this embodiment, a bearing (23) is provided between the door leaf fixing seat (9) and the second connecting shaft (7).

[0076] In this embodiment, the door frame side fixing seat assembly (2) comprises a door frame side fixing seat (201), and the door frame side fixing seats (201) are connected by a connecting rod (202).

[0077] A limit shift block (203) is also installed on the door frame side fixing seat (201).

[0078] like Fig.11 As shown, the limit shift block (203) is provided with a spring installation position (2031) and a limit contact arc surface (2032), and a spring (2033) is installed on the spring installation position (2031).

[0079] The other end of the spring (2033) is provided with a limit force adjustment block (204).

[0080] like Fig.10 As shown, the door frame side fixing seat (201) is also provided with a limit shift block adjustment hole (2011), the limit force adjustment block (204) is installed in the limit shift block adjustment hole (2011), and a force adjustment hole (2012) is also provided in communication with the limit shift block adjustment hole (2011), a force adjustment screw (2013) is installed in the force adjustment hole (2012), and the limit force adjustment block (204) is provided with a force adjustment screw hole (2014) for installing the force adjustment screw (2013).

[0081] like Figure 12-14 As shown, the limit force adjustment block (204) is also provided with a spring fixing column (2041) for inserting into the other end of the spring (2033).

[0082] In this embodiment, the connecting rod (202) includes a first connecting rod (2021) and a second connecting rod (2022).

[0083] The door frame side fixing seat (201) is provided with a limit block installation position (205), a locking screw (2051) is installed in the limit block installation position (205), and the locking screw (2051) passes through the limit block (203) and is fixed by a nut (22).

[0084] The door frame side fixing seat (201) is also provided with a sliding guide groove (206) and a limiting fixing groove (207).

[0085] In this embodiment, the door frame side fixing seat (201) is further provided with a fixing hole (208), and a door frame side fixing screw (209) is installed in the fixing hole (208).

[0086] The sliding column assembly (5) comprises a sliding column sleeve (501), and a first sliding column (502) and a second sliding column (503) are respectively installed at both ends of the sliding column sleeve (501). A sliding column thrust spring (504) is installed in the sliding column sleeve (501), and the first sliding column (502) and the second sliding column (503) are respectively installed at both ends of the sliding column thrust spring (504), so that the sliding column thrust spring (504) is in a compressed state.

[0087] like Fig. 9 As shown, the sliding guide piece (10) is provided with a sliding guide arc groove (100), a position-limiting fixed arc groove (200) and a left-right adjustable air-avoiding arc groove (300); the sliding guide arc groove (100) is connected to the position-limiting fixed arc groove (200); the left-right adjustable air-avoiding arc groove (300) and the sliding guide arc groove (100) and the position-limiting fixed arc groove (200) are respectively arranged on both sides of the sliding guide piece (10);

[0088] A door leaf side mounting plate (400) is also provided on one side of the door leaf side fixing seat assembly (3).

[0089] The working process of this application is as follows:

[0090] Opening process:

[0091] The closed state is Fig.14 As shown, during the opening process, 0° to 45° Fig.15 As shown, during the opening process, when the angle is from 45° to 90°, Fig.16 As shown, the opening process from 90° to 180° is as follows Fig.17 As shown,

[0092] During the opening process, when the angle is from 0° to 45°, the sliding column assembly (5) is contained in the fixed limiting groove (102) and the positioning groove (801), and rotates in the sliding guide groove (206). Since the limiting groove structure B (805) and the limiting groove structure A (802) in the opening and closing sequence piece are engaged with the sequence piece limiting connection piece A (12) and the sequence piece limiting connection piece B (13), and the opening and closing sequence piece sliding wear-resistant part (807) is contained in the limiting fixed arc groove (200), they become one. At this time, only the connecting rod A (4) in the rotating shaft hole of the first rotating shaft hole (101) rotates.

[0093] During the opening process, the sliding column assembly (5) is located in the fixed limiting groove (102) and the positioning groove (801) at an angle of 45° to 90°. During the opening process, the sliding column assembly (5) continues to slide in the sliding guide groove (206) and enters the limiting fixed groove (207) after pressing the limiting shift block (203). At this time, the positioning groove (801) is separated from the sliding column assembly (5), and the limiting groove structure A (802) and the limiting groove structure B (805) are separated from the sequential piece limiting connection member A (12) and the sequential piece limiting connection member B (13). The opening and closing sequential piece sliding wear-resistant member (807) is separated from the limiting fixed arc groove (200). At the same time, the sliding column assembly (5) is fixed in the limiting fixed groove (207) due to the pressure of the limiting shift block (203). At this time, only the second rotating shaft hole (105) rotates.

[0094] That is, the 90° positioning function can be enabled at this time.

[0095] During the opening process from 90° to 180°, only the second rotating shaft hole (105) rotates, at which time the opening and closing sequence plate sliding wear-resistant part (807) escapes from the limiting fixed arc groove (200) and slides along the sliding guide arc groove (100).

[0096] Closing process:

[0097] like Fig.17 As shown, during the closing process, the second rotating shaft hole (105) rotates from 180° to 90°. At this time, the sliding wear-resistant part (807) of the opening and closing sequence piece (rubber sleeve in this application) moves along the sliding guide arc groove (100) until it slides into the limiting fixed arc groove (200). At this time, the upper limit groove structure A (802) and the limit groove structure B (805) of the opening and closing sequence piece (8) contact the limit connecting rod. At this time, the positioning groove (801) begins to contact the sliding column assembly (5).

[0098] like Fig.16 As shown, during the closing process from 90° to 45°, only the first rotating shaft hole (101) rotates. At this time, the sliding wear-resistant part (807) of the opening and closing sequence piece enters the limiting fixed arc groove (200), and the upper limit groove structure A (802) and the limiting groove structure B (805) of the opening and closing sequence piece (8) cooperate with the limiting connecting rod. At this time, the second rotating shaft hole (105) stops rotating. At this time, the positioning groove (801) further presses the sliding column assembly (5) and the limiting block (203) and the limiting block spring (2033) and then disengages from the limiting fixed groove (207). At the same time, the positioning groove (801) is engaged with the fixed limiting groove (102), and the sliding column assembly (5) further enters the sliding guide groove (206).

[0099] During this movement, the second rotating shaft hole (105) no longer rotates.

[0100] like Fig.15 As shown, during the closing process from 45° to 0°, only the rotation axis hole 201 rotates at 1.

[0101] At this time, the 8 sliding column completely enters the fixed limiting groove (102) and the positioning groove (801), and at the same time, the limiting groove structure A (802) and the limiting groove structure B (805) are fitted with the limiting connecting rod, and the opening and closing sequence piece sliding wear-resistant part (807) is fitted with the limiting fixed arc groove (200).

[0102] Continuously closed to 0° Fig.16 shown.

[0103] The concealed hinge provided by the utility model can realize rotation angle positioning and has the advantages of strong stability, easy adjustment, and the ability to open to 90°. The unique structural design of the application makes the application extremely stable. At the same time, combined with the adjustment of the door frame side fixing seat assembly and the door leaf side fixing seat assembly, the use process is also very convenient. More importantly, the application can realize angle positioning, which is a function that cannot be achieved in the prior art. Therefore, the application has great economic value and practical value.

[0104] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A concealed hinge capable of realizing rotation angle positioning, characterized in that: The invention comprises a rotating arm body (1), wherein two ends of the rotating arm body (1) are respectively provided with a door frame side fixing seat assembly (2) and a door leaf side fixing seat assembly (3). One end of the rotating arm body (1) is provided with a first rotating shaft hole (101) and a fixed limiting groove (102). The other end is provided with an opening and closing sequence piece mounting hole (103), a clearance groove (104) and a second rotation shaft hole (105). A connecting rod A (4) and a sliding column assembly (5) are respectively installed in the first rotating shaft hole (101) and the fixed limiting groove (102), and the connecting rod A (4) and the sliding column assembly (5) are connected to the door frame side fixing seat assembly (2). A first connecting shaft (6) is installed in the opening and closing sequence plate installation hole (103), a second connecting shaft (7) is installed in the second rotating shaft hole (105), and the second connecting shaft (7) is connected to the door leaf side fixing seat assembly (3). The two sides of the rotating arm body (1) are provided with opening and closing sequence plates (8), and the opening and closing sequence plates (8) are provided with positioning grooves (801), limiting groove structures A (802), installation holes (803), rivet installation positions (804) and limiting groove structures B (805). The positioning groove (801) cooperates with the sliding column assembly (5). The mounting hole (803) matches the first connecting shaft (6). A rivet (806) is installed on the rivet installation position (804), and a wear-resistant part (807) is installed on the rivet.

2. According to claim 1, a concealed hinge capable of realizing rotation angle positioning is characterized in that: The door leaf side fixing seat assembly (3) comprises a door leaf fixing seat (9) connected to the second connecting shaft (7), The door leaf fixing seat (9) is provided with a sliding guide plate (10) and a door leaf adjusting structure (11). The door leaf fixing seat (9) and the sliding guide plate (10) are connected to the door leaf adjustment structure (11) via a sequential plate limiting connection piece A (12) and a sequential plate limiting connection piece B (13). The door leaf adjustment structure (11) comprises a connecting guide rod (14) arranged between the door leaf fixing seats (9) and an upper and lower adjustment sleeve (16) connected to the connecting guide rod (14) via an adjustment screw (15). The upper and lower adjustment sleeves (16) are also provided with a machine screw installation position (17) for installing a machine screw (18). An up-and-down adjustment column (19) is also installed inside the up-and-down adjustment sleeve (16) to abut against the machine screw (18) for adjustment in the up-and-down direction.

3. According to claim 2, the concealed hinge capable of realizing rotation angle positioning is characterized in that: The upper and lower adjustment columns (19) are provided with sealing grooves (20), and the sealing grooves (20) are sleeved with sealing rings (21). The ends of the upper and lower adjustment columns (19) are inclined plane structures (191), and the inclined plane of the inclined plane structure (191) abuts against the machine screw (18).

4. The concealed hinge capable of realizing rotation angle positioning according to claim 2, characterized in that: The upper and lower adjustment sleeves (16) and the connecting guide rod (14) are respectively provided with a first adjustment screw installation position (161) and a second adjustment screw installation position (141); the adjustment screw (15) passes through the first adjustment screw installation position (161) and the second adjustment screw installation position (141) in sequence and is fixed by a nut (22).

5. The concealed hinge capable of realizing rotation angle positioning according to claim 2, characterized in that: A bearing (23) is provided between the door leaf fixing seat (9) and the second connecting shaft (7).

6. The concealed hinge capable of realizing rotation angle positioning according to claim 1, characterized in that: The door frame side fixing seat assembly (2) comprises a door frame side fixing seat (201), wherein the door frame side fixing seats (201) are connected via a connecting rod (202). A limit shift block (203) is also installed on the door frame side fixing seat (201). The limit shift block (203) is provided with a spring installation position (2031) and a limit contact arc surface (2032), and a spring (2033) is installed on the spring installation position (2031). The other end of the spring (2033) is provided with a limit force adjustment block (204). The door frame side fixing seat (201) is also provided with a limit shift block adjustment hole (2011), the limit force adjustment block (204) is installed in the limit shift block adjustment hole (2011), a force adjustment hole (2012) is also provided in communication with the limit shift block adjustment hole (2011), a force adjustment screw (2013) is installed in the force adjustment hole (2012), and the limit force adjustment block (204) is provided with a force adjustment screw hole (2014) for installing the force adjustment screw (2013). The limit force adjustment block (204) is also provided with a spring fixing column (2041) for being inserted into the other end of the spring (2033).

7. The concealed hinge capable of realizing rotation angle positioning according to claim 6, characterized in that: The connecting rod (202) comprises a first connecting rod (2021) and a second connecting rod (2022), The door frame side fixing seat (201) is provided with a limit block installation position (205), a locking screw (2051) is installed in the limit block installation position (205), and the locking screw (2051) passes through the limit block (203) and is fixed by a nut (22). The door frame side fixing seat (201) is also provided with a sliding guide groove (206) and a limiting fixing groove (207).

8. The concealed hinge capable of realizing rotation angle positioning according to claim 2, characterized in that: The door frame side fixing seat (201) is also provided with a fixing hole (208), and a door frame side fixing screw (209) is installed in the fixing hole (208). The sliding column assembly (5) comprises a sliding column sleeve (501), a first sliding column (502) and a second sliding column (503) are respectively installed at both ends of the sliding column sleeve (501), a sliding column thrust spring (504) is installed in the sliding column sleeve (501), the first sliding column (502) and the second sliding column (503) are respectively installed at both ends of the sliding column thrust spring (504), so that the sliding column thrust spring (504) is in a compressed state. The sliding guide plate (10) is provided with a sliding guide arc groove (100), a limiting fixed arc groove (200) and a left-right adjustable air-avoiding arc groove (300); the sliding guide arc groove (100) is connected to the limiting fixed arc groove (200); the left-right adjustable air-avoiding arc groove (300) and the sliding guide arc groove (100) and the limiting fixed arc groove (200) are respectively arranged on both sides of the sliding guide plate (10); and a door leaf side mounting plate (400) is also provided on one side of the door leaf side fixing seat assembly (3).

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