A concealed hinge, a door having the hinge, and a method for installing the door

Abstract

The present invention discloses a concealed hinge, belonging to the technical field of interior decoration, which includes a first hinge piece, a second hinge piece and a hinge seat. The first hinge piece and the second hinge piece are rotationally connected through the same core shaft. The first hinge piece is detachably connected to the hinge seat. The hinge seat includes a detachable base and an outer cover. After the base and the outer cover are connected, there is an activity space for the first hinge piece to be inserted laterally. There is an activity plate in the activity space, and the activity plate is restricted between the base and the outer cover. The first hinge piece is installed on the activity plate through a cover plate and a first bolt. The present invention can adjust the position of the activity plate by using an adjusting bolt to adjust the flatness of the door body and the door frame, and the rotating part can adjust the upper and lower door gaps between the door body and the door frame to be the same, so as to ensure the installation effect of the door body, and there will be no abrupt appearance during the installation of the door, avoiding reducing the aesthetic appearance.

Description

Technical Field

[0001] The present invention discloses a concealed hinge, a door having the hinge, and an installation method of the door, belonging to the technical field of interior decoration. Background Art

[0002] A hinge, also known as a hinge joint, is a mechanical device used to connect two solids and allow relative rotation between the two. A hinge can be composed of movable components or made of foldable materials. Hinges are mainly installed on doors and windows and are the main components of door products. There are exposed hinges and concealed hinges, etc. For an exposed hinge, since the rotating shaft is placed outside the door leaf and the door frame, it is easy to be damaged and the door can be pried open from the hinge side of the door leaf, and it also affects the overall aesthetic appearance of the door. Therefore, for a secure entry anti-prying door, anti-prying and aesthetics are particularly important. In addition, existing concealed hinges are all hidden inside the door frame, and the structure of the rotating arm is long and loose with poor rigidity, which affects the bearing capacity.

[0003] To solve the above problems, our company has developed a concealed hinge with the publication number CN211144121U. Its specific structure includes a first hinge leaf and a second hinge leaf that are hinge-connected to the same core shaft through a bushing. The bushing is in a circular ring shape. The first hinge leaf is an integrally formed Z-shaped structure. The bushing of the second hinge leaf is installed at both ends of the bushing of the first hinge leaf. An opening is provided on the second hinge leaf. When the included angle between the first hinge leaf and the second hinge leaf is 0 degree, one surface of the first hinge leaf is placed inside the opening. It also includes a hinge seat, and the other surface of the first hinge leaf is installed on the hinge seat. A washer is sleeved between the first hinge leaf and the second hinge leaf. A bearing is provided between the bushing of the second hinge leaf and the core shaft, and sealing caps are installed at both ends of the core shaft.

[0004] At the beginning of the design of the above patent, theoretically, the connection part between the first hinge leaf and the second hinge leaf can be semi-concealed or even fully concealed, and the rotation amplitude of the door body is also increased. During the actual installation process, although the door body and the door frame can be connected through the hinge, due to installation errors of the hinge seat, and the relative position of the second hinge leaf cannot be adjusted after being fixed. If the door body is closed, the outermost planes of the door body and the door frame are not flat, showing inward depression or outward protrusion. Therefore, the hinge needs to be disassembled and adjusted repeatedly. Moreover, when installing, the gap between the bottom of the door body and the bottom edge of the door frame or the ground is small, while there is a large gap at the top. Thus, it looks very abrupt in the overall appearance, and the hinge seat is completely exposed outside the door frame during installation and can also be seen at the opening and closing part between it and the door frame after the door body is opened, which will also affect the overall appearance and reduce the quality of the door. And if it is completely concealed, it will bring great difficulties to the design of the hinge structure and its installation with the door. Summary of the Invention

[0005] The object of the present invention is to solve the problem that the existing hinge structure design has defects, resulting in installation errors between the door body and the door frame and reducing the appearance quality of the door, and to provide a concealed hinge, a door with the hinge, and an installation method of the door.

[0006] The present invention realizes the above object through the following technical solutions. A concealed hinge includes a first hinge piece, a second hinge piece, and a hinge seat. The first hinge piece and the second hinge piece are rotationally connected through the same core shaft. The first hinge piece is detachably connected to the hinge seat. The hinge seat includes a detachably connected base and an outer cover. After the base and the outer cover are connected, there is an activity space for the first hinge piece to be inserted laterally. An activity plate is provided in the activity space. The activity plate is restricted between the base and the outer cover. The first hinge piece is installed on the activity plate through a cover plate and a first bolt. The outer cover is provided with a first adjusting device for adjusting the movement of the activity plate along the direction perpendicular to the insertion direction of the first hinge piece into the activity space. The first adjusting device includes an adjusting bolt threadedly connected to the activity plate and exposed on the surface of the outer cover. The cover plate is provided with a rotating member for adjusting the installation height of the first hinge piece. The rotating member has at least two different installation heights with the first hinge piece.

[0007] By adopting the above technical solutions, the activity plate is restricted in the activity space and threadedly connected to the first bolt. When the adjusting bolt is rotated, the first hinge piece is driven by the activity plate to move along the adjusting bolt, thereby adjusting the relative position between the door body and the door frame and keeping the two in a basically flat state, without an outwardly protruding or inwardly sunken appearance effect. And the rotating member is used to support the first hinge piece, and it has different installation positions with the first hinge piece, thereby controlling the height of the first hinge piece, adjusting the gap size between the door body and the door frame, ensuring the installation effect of the door body, and not having a large appearance abruptness when the door is installed, avoiding reducing the appearance aesthetic feeling.

[0008] Preferably, the rotating member has an eccentric outer contour in contact with the first hinge piece. When the contact position between the eccentric outer contour and the first hinge piece changes, the relative installation position between the first hinge piece and the hinge seat can be adjusted. An installation hole is provided on the first hinge piece. The rotating member passes through the cover plate, the installation hole, and the activity plate and is connected to the base through a second bolt.

[0009] By adopting the above technical solutions, as the rotating member rotates, the contact position between the eccentric outer contour and the first hinge piece changes, and since the eccentric distance of the eccentric outer contour is also different, the installation height of the first hinge piece shows a changing trend, so as to ensure that the upper and lower door gaps are basically the same.

[0010] Preferably, the eccentric outer contour has at least three support surfaces with a gradually changing distance from the center of the rotating member, and a transition fillet is provided between adjacent support surfaces.

[0011] By adopting the above technical solution, the supporting surface can increase the force-bearing area between the rotating member and the first hinge piece, ensure the relative stability of their installation, and extend their service life.

[0012] Preferably, a T-shaped through groove facilitating the lateral separation of the first hinge piece from the first bolt is provided on the first hinge piece, and a spring is provided on the side of the first bolt close to the cover plate.

[0013] By adopting the above technical solution, the T-shaped through groove is provided to facilitate the assembly of the first hinge piece after the pre-installation of the first bolt, and the spring can keep the cover plate and the movable plate apply a pre-tightening force to the first hinge piece, thus facilitating the subsequent adjustment of the rotating member.

[0014] Preferably, a convex column for positioning and adjusting the installation position of the adjusting bolt is provided on the base, and one end of the convex column is embedded in the interior of the adjusting bolt.

[0015] By adopting the above technical solution, the convex column is provided to ensure that the adjusting bolt will not swing during rotation, avoiding damage to the threads on the movable plate.

[0016] Preferably, a positioning flange and a groove for mutual fitting and installation are provided on the outer cover and the base, and the two are connected by fasteners.

[0017] By adopting the above technical solution, the outer cover and the base can be conveniently disassembled, the damaged parts can be replaced, and the assembly is convenient and simple.

[0018] Preferably, an installation plane is provided on the base, and assembly holes are provided on the installation plane.

[0019] By adopting the above technical solution, by using the installation plane and the assembly holes, the positioning installation of the hinge seat can be quickly realized.

[0020] A door includes a door body, a concealed hinge and a door frame. The door frame is a hollow prism structure with one side against the wall open. The concealed hinge is embedded and installed in the door frame, and the second hinge piece extends out of the door frame and is fixedly installed with the door body. The door frame has through holes corresponding to the positions of the first bolt, the rotating member and the adjusting bolt.

[0021] By adopting the above technical solution, by using the through holes on the door frame, the concealed hinge can be integrally assembled in the door frame, thus achieving the effect of semi-concealment or even full concealment, and the hinge can also be directly disassembled and adjusted without being directly exposed on the outside and the surface of the door frame, greatly improving the overall appearance effect of the door.

[0022] An installation method of a door includes the following steps:

[0023] S1: Assemble the concealed hinge except for the first hinge plate and the second hinge plate. Adjust the gap between the movable plate and the base to the maximum or minimum. Use a spirit level to vertically fix two sets of concealed hinges on the inner side of the door frame from the open side of the door frame. The base is closely attached to the inner wall of the door frame. At the same time, adjust the first bolt, the rotating part, and the adjusting bolt to be within the orthographic projection range of different position through holes;

[0024] S2: Install the open side of the door frame against the wall. Then use screws to fixedly connect the second hinge plate to the door body. Insert the first hinge plate through the door frame and into the space between the movable plate and the cover plate, and then pre-tighten it with the first bolt. Then close the door body. Measure the concave or convex distance L1 of the outer plane of the top of the door body relative to the door frame. The convex distance is positive, and the concave distance is negative. Then adjust the concealed hinge near the upper end of the door body. Calculate the number of turns of simultaneously turning the two adjusting bolts according to L1 and the pitch of the adjusting bolt, so that the movable plate drives the first hinge plate to move, and control the value of L1 to be between -1 - 1 mm;

[0025] S3: Measure the concave or convex distance L2 of the outer plane of the bottom of the door body relative to the door frame. Adjust the concealed hinge near the lower end of the door body. Calculate the number of turns of simultaneously turning the two adjusting bolts according to L2 and the pitch of the adjusting bolt, so that the movable plate drives the first hinge plate to move, and control the value of L2 to be between -1 - 1 mm;

[0026] S4: Measure the sizes of L1 and L2 again. Adjust the concealed hinge at the corresponding position according to the larger absolute value of L1 or L2. Repeat this process until the maximum difference between the two is less than 0.5 mm; [[ID=ll]]

[0027] S5: Measure the size of the gap L3 between the top of the door body and the door frame, and measure the size of the gap L4 between the bottom of the door body and the ground. Calculate S = (L4 + L3) / 2. Find the integer millimeter gasket close to the value of S according to rounding. First, lift the door body to the highest position. Then rotate all the rotating parts so that the position with the minimum eccentricity of the rotating part contacts the first hinge plate. Then place the gasket at the bottom of the door frame. Then rotate all the rotating parts until it is about to lift the door body upward. Then tighten all the first bolts and remove the gasket to complete the installation.

[0028] By adopting the above technical solution, first assemble the hinge seat in the door frame, and then realize the connection and installation of the door body and the door frame. And adjust the flatness of the door body and the door frame first, and then adjust the size of the upper and lower door gaps. In this way, it can avoid affecting the door gap size when adjusting the flatness, reduce the repeated adjustment work, and the installation and adjustment of the door body are simple, without complex alignment work, and can also ensure the overall installation effect.

[0029] Preferably, the L1 measurement method is based on the door frame. The thickening piece is closely attached to the door frame or the top of the door body so that the two are basically flush. L1 is equal to the thickness of the thickening piece. The L2 measurement method is to draw lines on the door frame and the bottom of the door body respectively, and measure the average distance between the two lines. The L3 and L4 measurement methods are to insert the largest integer millimeter gasket between the door body and the door frame and between the door body and the ground.

[0030] By adopting the above technical solutions, such measurement can simplify the operation process, eliminate the need for special instruments, reduce the measurement difficulty, and enhance the practicality of the measurement.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. By providing adjustment bolts and rotating parts, the flatness of the outermost sides of the door body and the door frame and the size of the door gap above and below the door body can be adjusted respectively, thus ensuring the aesthetic appearance of the door during installation, avoiding visual abruptness, and also enabling the hinge to be semi-hidden or even fully hidden, which has high practical value compared with the initial design.

[0033] 2. The rotating part has an eccentric outer contour. As the contact position with the first hinge piece changes, the height of the door body is adjusted, and the two are kept stable through the supporting surface. In this way, the service life of the parts can also be extended, and the adjustment is convenient.

[0034] 3. The door installation method is simple, without the need for complex alignment work, and the overall installation effect can also be guaranteed. [[ID=ID=17]]BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a three-dimensional structure diagram of a hidden hinge of the present invention;

[0036] Figure 2 is a partial cross-sectional view of a hidden hinge of the present invention;

[0037] Figure 3 is a structural schematic diagram of a hinge seat in the present invention;

[0038] Figure 4 is a structural schematic diagram of a base in the present invention;

[0039] Figure 5 is an assembly structural schematic diagram of a first hinge piece and a second hinge piece in the present invention;

[0040] Figure 6 is a structural schematic diagram of a rotating part in the present invention;

[0041] Figure 7 is an installation structural schematic diagram of a door body, a hidden hinge and a door frame in the present invention Figure 1 ;

[0042] Figure 8 Schematic installation structure of the door body, concealed hinge and door frame in the present invention Figure 2 ;

[0043] Figure 9 is Figure 8 a partial enlarged view of part A in

[0044] Figure 10 is Figure 8 a partial enlarged view of part B in

[0045] Reference numerals: 1, mandrel; 2, second hinge piece; 3, adjusting bolt; 4, installation plane; 5, outer cover; 6, first bolt; 7, cover plate; 8, rotating member; 9, positioning flange; 10, assembly hole; 11, spring; 12, first hinge piece; 13, movable plate; 14, second bolt; 15, base; 16, convex column; 17, groove; 18, eccentric outer contour; 19, movable space; 20, T-shaped through groove; 21, installation hole; 22, door frame; 23, door body; 24, thickening piece; 25, gasket; 26, through hole. Specific embodiments

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0047] As Figures 1-7 shown, a concealed hinge includes a first hinge piece 12, a second hinge piece 2 and a hinge seat. The first hinge piece 12 and the second hinge piece 2 are connected into a whole through a mandrel 1 and can rotate freely with the mandrel 1 as a reference. The hinge seat is mainly composed of a base 15 and an outer cover 5. A groove 17 is provided on the base 15, and a positioning flange 9 is provided on the outer cover 5. When the two are assembled, the positioning flange 9 is embedded into the groove 17 and the sides are connected by fasteners, so that the assembly and disassembly of the two can be facilitated. Moreover, an activity space 19 is formed after the base 15 and the outer cover 5 are assembled. The first hinge piece 12 can be inserted into the activity space 19 from the side of the hinge seat. To facilitate the installation of the hinge seat, an installation plane 4 and an assembly hole 10 are provided on the base 15. The installation plane 4 can be closely attached to the inner wall of the door frame 22, and then fastened with bolts.

[0048] Secondly, a movable plate 13 is arranged in the activity space 19. The side surface of the movable plate 13 is restricted by the base 15 and the outer cover 5, and there is a movable gap in its thickness direction. An adjusting bolt 3 is arranged on the outer cover 5. One end of the adjusting bolt 3 is exposed on the surface of the outer cover 5, and the other end penetrates through the outer cover 5 and is threadedly connected to the movable plate 13. After the adjusting bolt 3 is adjusted by turning the knob, the movable plate 13 can move along the length direction of the adjusting bolt 3. The first hinge piece 12 is detachably installed on the movable plate 13. When the movable plate 13 moves, it can drive the first hinge piece 12 to approach the outer cover 5 or the base 15. The second hinge piece 2 is connected to the door body 23. The first hinge piece 12 and the second hinge piece 2 are regarded as a whole. When the installation position of the first hinge piece 12 changes, the position of the second hinge piece 2 also changes accordingly. Since the moving direction of the movable plate 13 is consistent with the thickness direction of the door body 23 and the door frame 22, the flatness of the outermost side surfaces of the door body 23 and the door frame 22 can be appropriately adjusted, so as to ensure that the door body 23 will not be sunken or protruded relative to the door frame 22. And in order to ensure the stability of the adjusting bolt 3 during assembly and rotation, a convex column 16 is added to the base 15. During installation, one end of the convex column 16 is embedded in the interior of the adjusting bolt 3, preventing the adjusting bolt 3 from swinging and causing thread damage when relative movement occurs with the movable plate 13, thereby prolonging the service life of the parts.

[0049] Meanwhile, the first hinge piece 12 is assembled with the movable plate 13 through the first bolt 6 and the cover plate 7. Specifically, the first hinge piece 12 is located between the cover plate 7 and the movable plate 13, and the first bolt 6 is exposed outside the cover plate 7 and is tightened. Moreover, the outer cover 5 does not cover the cover plate 7, and the adjusting bolt 3 and the first bolt 6 can be directly seen from the outside of the hinge seat. At the same time, a T-shaped through groove 20 is arranged on the first hinge piece 12, so that it is convenient to directly disassemble the first hinge piece 12. Only by loosening the first bolt 6, the first hinge piece 12 can be pulled out to the side of the hinge seat, thus completing the disassembly and assembly of the door body 23.

[0050] In addition, in order to adjust the size of the upper and lower door gaps after the door body 23 is installed, a rotating member 8 is provided on the cover plate 7. The rotating member 8 includes an eccentric outer contour 18 that contacts the first hinge piece 12, so that when adjusting it with the first hinge piece 12, with the change of different contact positions, it has at least two different installation heights. The eccentric outer contour 18 includes at least three supporting surfaces, and the distances from the supporting surfaces at different positions to the center of the rotating member 8 show a gradual change trend. The first hinge piece 12 has a mounting hole 21. The eccentric outer contour 18 of the rotating member 8 penetrates through the cover plate 7, the mounting hole 21 and the movable plate 13, and a second bolt 14 threadedly connected to the rotating member 8 is provided on the base 15. For the convenience of adjusting the rotating member 8, the second bolt 14 is also threadedly connected to the base 15. Thus, when the rotating member 8 is rotated, the contact of one of the supporting surfaces with the first hinge piece 12 is changed to the contact of another supporting surface with the first hinge piece 12, thereby changing the relative position of the first hinge piece 12 between the cover plate 7 and the movable plate 13. Thereby, the upper and lower door gaps can be adjusted to avoid excessive deviation that affects the overall appearance effect of the door. In order to ensure the smooth movement of the first hinge piece 12, a spring 11 is provided on the outer side of the first bolt 6. The spring 11 can apply a pre-tightening force to the cover plate 7, so that the cover plate 7, the first hinge piece 12 and the movable plate 13 are in a relatively static state, rather than being fixed and unable to be adjusted. Moreover, the supporting surface increases the contact area with the first hinge piece 12, which is surface contact rather than line contact, thus ensuring the stability of the installation force and further extending the service life of the parts. At the same time, an arc transition is provided between the two supporting surfaces, which can facilitate the rotation of the rotating member 8 and reduce the wear between the two.

[0051] As Figure 7 , Figure 8 shown, a door mainly includes a concealed hinge, a door body 23 and a door frame 22. The door frame 22 is a hollow prism structure. The side close to the wall is open for facilitating the installation of the hinge seat. The side close to the door body 23 is a semi-closed structure, only leaving through holes 26 corresponding to the adjusting bolt 3, the first bolt 6 and the rotating member 8. After installation, the hinge seat is completely shielded by the door frame 22 and is basically invisible from the surface of the door frame 22. The second hinge piece 2 extends from the side of the door frame 22 to the outside for connecting the door body 23. Moreover, the overall structure of the first hinge piece 12 and the second hinge piece 2 can achieve semi-concealment or even full concealment after the door body 23 is closed, which has been disclosed in previous patents and will not be elaborated here. At the same time, after the door body 23 is opened, the hinge seat will not affect the appearance of the door frame 22, and it has strong practicability.

[0052] As Figures 7-10 shown, the installation method of this door mainly includes the following steps:

[0053] S1: Assemble the concealed hinge except for the first hinge plate 12 and the second hinge plate 2. Adjust the gap between the movable plate 13 and the base 15 to the maximum or minimum. Use a spirit level to vertically fix the two sets of concealed hinges on the inner side of the door frame 22 from the open side of the door frame 22. The base 15 is close to the inner wall of the door frame 22. At the same time, adjust the first bolt 6, the rotating member 8, and the adjusting bolt 3 to be within the orthographic projection range of different position through holes 26;

[0054] S2: Install the open side of the door frame 22 against the wall. Then use screws to fixedly connect the second hinge plate 2 to the door body 23. Pass the first hinge plate 12 through the door frame 22 and insert it between the movable plate 13 and the cover plate 7, and then pre-tighten it with the first bolt 6. Then close the door body 23 and measure the concave or convex distance L1 of the outer plane of the top of the door body 23 relative to the door frame 22. The convex distance is a positive value, and the concave distance is a negative value. When specifically measuring, take the door frame 22 as the reference. If the upper end of the door body 23 is concave relative to the door frame 22, add a thickening piece 24 to the surface of the door body 23 to make the door frame 22 and the door body 23 basically flat, and then L1 can be measured. Then adjust the concealed hinge near the upper end of the door body 23. Calculate the number of turns of the two adjusting bolts 3 rotated simultaneously according to L1 and the pitch of the adjusting bolt 3, so that the movable plate 13 drives the first hinge plate 12 to move, and control the value of L1 to be between -1 and 1 mm;

[0055] S3: Measure the concave or convex distance L2 of the outer plane of the bottom of the door body 23 relative to the door frame 22. L2 is measured by the same method as L1. Adjust the concealed hinge near the lower end of the door body 23. Calculate the number of turns of the two adjusting bolts 3 rotated simultaneously according to L2 and the pitch of the adjusting bolt 3, so that the movable plate 13 drives the first hinge plate 12 to move, and control the value of L2 to be between -1 and 1 mm;

[0056] S4: Measure the magnitudes of L1 and L2 again. Adjust the concealed hinge at the corresponding position according to the larger absolute value of L1 or L2. Repeat this process until the maximum difference between the two is less than 0.5 mm;

[0057] S5: Measure the size of the gap L3 between the top of the door body 23 and the door frame 22, and measure the size of the gap L4 between the bottom of the door body 23 and the ground. The specific measurement method of L3 and L4 is to insert the largest integer millimeter gasket 25 between the door body 23 and the door frame 22, and between the door body 23 and the ground. Calculate S = (L4 + L3) / 2. Find the integer millimeter gasket 25 close to the value of S according to rounding. First, lift the door body 23 to the highest position, then rotate all the rotating members 8 so that the minimum eccentricity position of the eccentric outer contour 18 contacts the first hinge plate 12. Then place the gasket 25 at the bottom of the door frame 22, and then rotate all the rotating members 8 until the door body 23 needs to be lifted upward. Then tighten all the first bolts 6 and remove the gasket 25 to complete the installation.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0059] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity purposes. Those skilled in the art should regard the specification as a whole, and the technical solutions in the various embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A concealed hinge, characterized in that, Comprising a first hinge piece (12), a second hinge piece (2) and a hinge base, the first hinge piece (12) and the second hinge piece (2) are rotationally connected by the same mandrel (1), the first hinge piece (12) is detachably connected to the hinge base, the hinge base comprises a detachable connected base (15) and an outer cover (5), after the base (15) and the outer cover (5) are connected, there is formed an activity space (19) for the first hinge piece (12) to be inserted laterally, an activity plate (13) is arranged in the activity space (19), the activity plate (13) is restricted between the base (15) and the outer cover (5), the first hinge piece (12) is installed on the activity plate (13) through a cover plate (7) and a first bolt (6), a first adjusting device for adjusting the movement of the activity plate (13) along the direction perpendicular to the insertion of the first hinge piece (12) into the activity space (19) is arranged on the outer cover (5), the first adjusting device comprises an adjusting bolt (3) threadedly connected to the activity plate (13) and exposed on the surface of the outer cover (5), a rotating member (8) for adjusting the installation height of the first hinge piece (12) is arranged on the cover plate (7), the rotating member (8) and the first hinge piece (12) have at least two different installation heights; the rotating member (8) has an eccentric outer contour (18) in contact with the first hinge piece (12), when the contact position between the eccentric outer contour (18) and the first hinge piece (12) changes, the relative installation position between the first hinge piece (12) and the hinge base can be adjusted, an installation hole (21) is arranged on the first hinge piece (12), the rotating member (8) passes through the cover plate (7), the installation hole (21) and the activity plate (13) and is connected to the base (15) through a second bolt (14); the eccentric outer contour (18) has at least three supporting surfaces with gradually changing distances from the center of the rotating member (8), and transition fillets are arranged between adjacent supporting surfaces; a T-shaped through groove (20) facilitating the lateral separation of the first hinge piece (12) from the first bolt (6) is arranged on the first hinge piece (12), and a spring (11) is arranged on the side of the first bolt (6) close to the cover plate (7); a convex column (16) for positioning the installation position of the adjusting bolt (3) is arranged on the base (15), and one end of the convex column (16) is embedded in the interior of the adjusting bolt (3).

2. The concealed hinge according to claim 1, characterized in that, Positioning flanges (9) and grooves (17) which are mutually fitted and installed are arranged on the outer cover (5) and the base (15), and the two are connected through fasteners.

3. A concealed hinge according to claim 1, characterized in that, An installation plane (4) is arranged on the base (15), and assembly holes (10) are arranged on the installation plane (4).

4. A door, characterized in that, Comprising a door body (23), a door frame (22) and the concealed hinge according to any one of claims 1-3, the door frame (22) is a hollow prism structure with one side against the wall being open, the concealed hinge is embedded and installed in the door frame (22), and the second hinge piece (2) extends out of the door frame (22) and is fixedly installed with the door body (23), and through holes (26) corresponding to the positions of the first bolt (6), the rotating member (8) and the adjusting bolt (3) are arranged on the door frame (22).

5. A method for installing a door, characterized in that, Including the door as described in claim 4, the installation steps are as follows: S1: Assemble the concealed hinge except for the first hinge plate (12) and the second hinge plate (2). Adjust the gap between the movable plate (13) and the base (15) to the maximum or minimum. Use a spirit level to vertically fix two sets of concealed hinges on the inner side of the door frame (22) from the open side of the door frame (22). The base (15) is close to the inner wall of the door frame (22). At the same time, adjust the first bolt (6), the rotating member (8), and the adjusting bolt (3) to be within the orthographic projection range of different position through holes (26); S2: Install the open side of the door frame (22) against the wall. Then use screws to fixedly connect the second hinge plate (2) to the door body (23). Insert the first hinge plate (12) through the door frame (22) and into the space between the movable plate (13) and the cover plate (7), and then pre-tighten with the first bolt (6). Then close the door body (23), measure the recessed or protruding distance L1 of the top outer plane of the door body (23) relative to the door frame (22), where the protruding distance is positive and the recessed distance is negative. Then adjust the concealed hinge near the upper end of the door body (23). Calculate the number of turns of simultaneously turning the two adjusting bolts (3) according to L1 and the pitch of the adjusting bolt (3), so that the movable plate (13) drives the first hinge plate (12) to move, and control the value of L1 to be between -1 and 1 mm; S3: Measure the recessed or protruding distance L2 of the bottom outer plane of the door body (23) relative to the door frame (22). Adjust the concealed hinge near the lower end of the door body (23). Calculate the number of turns of simultaneously turning the two adjusting bolts (3) according to L2 and the pitch of the adjusting bolt (3), so that the movable plate (13) drives the first hinge plate (12) to move, and control the value of L2 to be between -1 and 1 mm; S4: Measure the sizes of L1 and L2 again. Adjust the concealed hinge at the corresponding position according to the larger absolute value of L1 or L2. Repeat this process until the maximum difference between the two is less than 0.5 mm; S5: Measure the size of the gap L3 between the top of the door body (23) and the door frame (22), and measure the size of the gap L4 between the bottom of the door body (23) and the ground. Calculate S = (L4 + L3) / 2. Find the integer millimeter shim (25) close to the value of S according to rounding. First, lift the door body (23) to the highest position. Then rotate all the rotating members (8) so that the position with the minimum eccentricity of the rotating member (8) contacts the first hinge plate (12). Then place the shim (25) at the bottom of the door frame (22). Then rotate all the rotating members (8) until it is about to lift the door body (23). Then tighten all the first bolts (6) and remove the shim (25) to complete the installation.

6. The installation method of the door according to claim 5, characterized in that, The L1 measurement method is based on the door frame (22). The thickening piece (24) is closely attached to the door frame (22) or the top of the door body (23) so that the two are basically flush. L1 is equal to the thickness of the thickening piece (24). The L2 measurement method is to draw lines respectively at the bottoms of the door frame (22) and the door body (23), and measure the average distance between the two lines. The L3 and L4 measurement methods are to insert the maximum integer millimeter gasket (25) between the door body (23) and the door frame (22), and between the door body (23) and the ground.

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