Double-shaft rotating arm type blind hinge

Abstract

The utility model discloses a double-shaft rotating arm type blind hinge which comprises a door leaf hinge plate assembly, a door frame fixing seat, a double-shaft-hole rotating arm assembly, a shaft A, a shaft B, a plane supporting piece A and a plane supporting piece B. The door leaf hinge plate assembly is connected with the shaft hole A end of the double-shaft-hole rotating arm assembly through a shaft A, a shaft hole B of the door leaf hinge plate assembly is movably connected with the shaft A in a running fit mode, and the shaft A is fixedly connected with a double-shaft-hole rotating arm through a riveting pin or a fixing screw. The plane supporting piece A is arranged outside the shaft hole A of the double-shaft-hole rotating arm or the inner end of the plane supporting piece A abuts against the interior or the outer end of the shaft hole B of the door leaf hinge plate. The door frame fixing seat is in running fit connection with the shaft hole C end of the double-shaft-hole rotating arm through a shaft B; the plane supporting piece B is arranged at the outer end of the shaft hole C of the double-shaft-hole rotating arm and abuts against the inner side of the shaft hole D of the door frame fixing base. The door leaf hinge plate assembly comprises a door leaf hinge plate and a positioning device A; the double-shaft-hole rotating arm assembly at least comprises a double-shaft-hole rotating arm and a positioning device B.

Description

Technical Field

[0001] The utility model relates to a double-axis rotating arm type concealed hinge, which belongs to the category of hardware products. Background Art

[0002] Hinges are an important component of door products. Existing security doors use ordinary swing arm hinges, whose rotating shaft is located in the inner cavity of the door frame and is a single-axis structure swing arm concealed chain. However, the single-axis structure swing arm concealed chain has a small door opening angle, and the door opening angle can only reach about 120 degrees at most. For commercial housing corridor entrance doors and non-standard doors, concealed hinges with a door opening angle of 180 degrees are required. In addition, in recent years, the market demand for high-end security doors has led to an increasing use of concealed hinges. Therefore, it will become increasingly important to develop and design a swing arm concealed hinge that is easy to assemble, debug and install, ensures a continuous sealing strip on the door hinge edge, improves the sealing performance of the frame and leaf hinge edge, and enables the door opening angle to reach 180 degrees. Summary of the Invention

[0003] Based on the above product defects and requirements, the technical problem to be solved by the present invention is to provide a rotating arm concealed hinge structure that can make the door opening angle reach 180 degrees, can make the sealing strip of the door hinge edge continuous, and can improve the sealing performance of the frame and leaf hinge edge.

[0004] The following is the technical solution adopted by this utility model:

[0005] A double-axis swing arm concealed hinge comprises a door hinge assembly, a double-axis hole swing arm assembly for a door frame fixing seat, an axis A, an axis B, a flat support member A and a flat support member B. The door hinge assembly is connected to the axis hole A end of the double-axis hole swing arm assembly via axis A, the axis hole B of the door hinge assembly is rotatably connected to axis A, and axis A is fixedly connected to the double-axis hole swing arm by a rivet pin or a fixing screw; the flat support member A is arranged at the outer or inner end of the axis hole A of the double-axis hole swing arm and is mounted against the inner or outer end of the axis hole B of the door hinge assembly; the door frame fixing seat is rotatably connected to the axis hole C end of the double-axis hole swing arm via axis B; the flat support member B is arranged at the outer end of the axis hole C of the double-axis hole swing arm and is mounted against the inner side of the axis hole D of the door frame fixing seat; the double-axis hole swing arm assembly comprises at least a double-axis hole swing arm and positioning device B; the door hinge plate assembly includes a door hinge plate and a positioning device A; the positioning device A is arranged on the outer circle of the upper and lower axis holes B of the door hinge plate, and at least one side of the door hinge plate is provided with an outward boss and a threaded hole that are perpendicular to and intersect the center line of the axis hole B, and the threaded hole passes through the hole wall of the axis hole B, and the positioning device A is matched with the threaded hole and installed on the outside, and the positioning device A includes an external threaded device body, a compression spring A and a steel ball A; the shaft A is provided with at least one steel ball A positioning hole at the circumferential position corresponding to the positioning device A to limit the relative rotation of the door hinge plate and the shaft A or rotate into position.

[0006] The dual-axis hole pivot arm assembly comprises at least a dual-axis hole pivot arm and a positioning device B. The dual-axis hole pivot arm comprises an axis hole A, an axis hole C, and a connecting section between axis holes A and C, with positioning device B disposed in the connecting section. The dual-axis hole pivot arm is sequentially composed of axis hole A, an extended edge A of axis hole A, a bent outer corner A, an arcuate surface A or a multi-folded surface A, a connecting edge, a bent inner corner A, an R-shaped arcuate or polygonal surface, a bent outer corner B, a vertical edge A, a bent outer corner C, an extended edge B of axis hole C, and axis hole C, and includes formed spatial notches A and B. Spatial notches A and B are designed to accommodate the door leaf cover edge sealing strip, eliminating the need to interrupt the sealing strip, thereby improving the airtightness of the frame and leaf joint.

[0007] The positioning device B at least includes a tubular device body, a compression spring B, a positioning head or a steel ball B. The tubular device body is welded or riveted to the double-axis hole rotating arm or is integrally designed with the double-axis hole rotating arm as a precision casting structure.

[0008] The upper and lower supporting surfaces of the door frame fixing seat are provided with at least an axis hole D, a positioning head guide groove of the positioning device B, and a positioning hole A, and at least the lower supporting surface is provided with an outwardly concave positioning head guide groove and positioning hole A. The positioning head guide groove is designed so that when the door leaf is normally opened within an angle of about 110 degrees, the door leaf first rotates around the axis B and opens to the extreme position of about 110 degrees. The steel ball B of the positioning device B on the double-axis hole rotating arm assembly guides and positions with the positioning hole A to act as a windproof door suction; or the door leaf first rotates around the axis A and opens to a certain extreme angle. The axis A is locked in place and drives the double-axis hole rotating arm assembly to continue rotating around the axis B to increase the hinge opening angle.

[0009] When the door leaf is opened at an angle greater than 110 or 120 degrees, the bottom surface of the double-axis hole rotating arm space groove B presses against the door frame, and the double-axis hole rotating arm assembly is restricted from rotating around axis B. The door leaf overcomes the locking force of the positioning device A, and the door leaf continues to rotate around axis A to increase the door leaf opening angle, even opening to 180 degrees. Conversely, when the door leaf is closed, the door leaf first rotates around axis A until the steel ball A of the positioning device A (12) enters the positioning hole on axis A to lock the double-axis hole rotating arm assembly. The locking force of the positioning device A on the double-axis hole rotating arm assembly overcomes the locking force of the positioning device B on the double-axis hole rotating arm assembly and the locking hole A on the door frame fixing seat, and the steel ball B disengages from the locking hole A, and the door leaf closes and resets.

[0010] In addition, by designing a spatial groove A on the double-axis hole rotating arm, the door leaf sealing strip will not be squeezed and deformed when the door leaf is normally opened within the range of 110 or 120 degrees. Therefore, the door leaf sealing strip does not need to be interrupted at the hinge position, making the door product have better airtightness, thereby being more heat-insulating, energy-saving and environmentally friendly.

[0011] Furthermore: the door hinge plate includes at least an axis hole B and a mounting base, and the mounting base is provided with at least a plurality of elongated or circular mounting holes A.

[0012] Furthermore: the plane support A and the plane support B include a plane bearing structure of a sleeve plus a plane gasket or a copper gasket sandwiched between two plane gaskets, or a steel ball plane bearing or a simple plane washer.

[0013] Furthermore: the door frame fixing seat is a box-type structure formed on three sides or an ear-type structure with a symmetrical support leg design; regardless of the box-type structure or the ear-type structure, its upper and lower supporting surfaces are provided with at least an axis hole D, a positioning hole B of the positioning device B, a positioning hole C and a positioning hole A; the door frame fixing seat of the ear-type structure has at least a plurality of circular or elongated mounting holes B on its mounting legs.

[0014] Further: the double-axis hole pivot arm assembly includes at least a double-axis hole pivot arm and a positioning device B; the double-axis hole pivot arm structural shape can be a double-axis hole pivot arm a; the double-axis hole pivot arm a is composed of the axis hole A, the extended edge A of the axis hole A, the bent outer corner A, the arc surface A or the multi-fold surface A, the connecting edge, the bent inner corner A, the short inclined surface a, the bent outer corner Ba, the straight edge a, the bent outer corner Da, the vertical edge A, the bent outer corner C, the extended edge B of the axis hole C, and the axis hole C, including the forming space groove A and the space groove B.

[0015] Further: the double-axis hole pivot arm assembly includes at least a double-axis hole pivot arm and a positioning device B; the double-axis hole pivot arm structural shape can be a double-axis hole pivot arm b; the double-axis hole pivot arm b is composed of the axis hole Ab, the extended edge C of the axis hole A, the bent outer angle Ab, the vertical edge Bb, the connecting edge b of the bent outer angle Eb, the bent inner angle A, the R arc or polygonal surface, the bent outer angle B, the vertical edge A, the bent outer angle C, the extended edge B of the axis hole C, and the axis hole C, including the forming space groove A and the space groove B.

[0016] Further: the double-axis hole rotating arm assembly includes at least a double-axis hole rotating arm and a positioning device B; the structural shape of the double-axis hole rotating arm can be a double-axis hole rotating arm c; the double-axis hole rotating arm c is composed of the axis hole A, the extended edge C of the axis hole A, the bent outer angle Ab, the vertical edge B3b, the connecting edge b of the bent outer angle Eb, the bent inner angle A, the short inclined surface a, the bent outer angle D, the straight edge a, the bent outer angle D a, the vertical edge A, the bent outer angle C, the extended edge B of the axis hole C, and the axis hole C, including the forming space groove A and the space groove B.

[0017] Further: the double-axis hole pivot arm assembly includes at least a double-axis hole pivot arm and a positioning device B; the double-axis hole pivot arm structural shape can be a double-axis hole pivot arm d; the double-axis hole pivot arm d is composed of the axis hole A, the extended edge d of the axis hole A, the bent outer angle F, the arc surface B or the multi-fold surface B, the bent inner angle B, the R arc surface B or the multi-fold surface C, the R forming angle d, and the extended edge E of the axis hole C, including the forming space groove A and the space groove B.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] First, if the concealed hinge of the utility model is designed as a double-axis hole rotating arm or a double-axis hole rotating arm structure, the recessed space groove A will prevent the door leaf sealing strip from being squeezed and deformed when the door leaf is normally opened within the range of 110 or 120 degrees. Therefore, the door leaf sealing strip does not need to be interrupted at the hinge position, so that the door product has better airtightness, thereby being more heat-insulating, energy-saving and environmentally friendly.

[0020] Secondly, the concealed hinge of the present invention has a dual-axis structure of axis A and axis B. The door leaf is first opened to the normal opening angle through axis A or axis B, and then the opening angle is increased through axis B or axis A. Therefore, the door leaf is always opened by a single axis. The hinge has the advantages of strong bearing capacity, no abnormal noise generated by simultaneous rotation of multiple axes, long service life, and large opening angle.

[0021] Thirdly, the door leaf and door frame are easy to install. The door leaf is quickly connected with the axis B of the hinge and the axis hole D of the door frame fixing seat and is locked by a cotter pin. It is convenient, fast and easy to load and unload. The ear-type structure door frame fixing seat can also be easily maintained and disassembled in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional diagram illustrating the exploded structure of the present invention.

[0024] Figure 3 This is a cross-sectional view and structural illustration of the positioning device A of the present invention.

[0025] Figure 4 This is a diagram illustrating the structural features of the door hinge plate.

[0026] Figure 5 This is a diagram illustrating the structural decomposition of positioning device B.

[0027] Figure 6 This is a diagram illustrating the structural features of the double-axis hole arm assembly.

[0028] Figure 7 This is a diagram illustrating the technical features of the cross-sectional structure of a double-axis hole rotating arm.

[0029] Figure 8 This is a diagram illustrating the technical features of the cross-sectional structure of the double-axis hole rotating arm a.

[0030] Figure 9 This is a diagram illustrating the technical features of the cross-sectional structure of the double-axis hole rotating arm b.

[0031] Figure 10 This is a diagram illustrating the technical features of the cross-sectional structure of the double-axis hole rotating arm C.

[0032] Figure 11 This is a diagram illustrating the technical features of the cross-sectional structure of the double-axis hole rotating arm d.

[0033] Figure 12 Figure 1 is an illustration of the structural features of the door frame fixing seat.

[0034] Figure 13 Figure 2 is an illustration of the structural features of the door frame fixing seat.

[0035] Figure 14 Refer to the diagram for instructions on assembling the hinges with the door leaf in the closed position.

[0036] Figure 15 Refer to the diagram for instructions on assembling the hinges with the door leaf open 110 or 120 degrees.

[0037] Figure 16 Refer to the diagram for the maximum opening angle of the door leaf when assembling the hinge. DETAILED DESCRIPTION

[0038] Refer to the attached Figures 1-16 , the utility model is further described with reference to the embodiments:

[0039] A double-axis swing arm type concealed hinge, which includes a door hinge assembly 1, a door frame fixing seat 2, a double-axis hole swing arm assembly 3, an axis A4, an axis B5, a plane support A6 and a plane support B7; the double-axis hole swing arm assembly 3 at least includes a double-axis hole swing arm 31 and a positioning device B32; the door hinge assembly 1 is connected to the axis hole A311 end of the double-axis hole swing arm assembly 3 through the axis A4, and the axis hole B111 of the door hinge assembly 1 rotates with the axis A4. The two-axis hole pivot arm 31 is connected movably, and the axis A4 is fixedly connected to the axis hole A311 of the double-axis hole pivot arm 31 by a rivet pin or a fixing screw 13; the plane support member A6 is arranged at the outer or inner end of the axis hole A311 of the double-axis hole pivot arm 31 and is installed against the inner or outer end of the axis hole B111 of the door hinge plate 11; the double-axis hole pivot arm assembly 3 at least includes the double-axis hole pivot arm 31 and the positioning device B32; the door frame fixing seat 2 is connected to the axis hole C3112 of the double-axis hole pivot arm 31 through the axis B5 The ends are rotatably connected; the planar support B7 is arranged at the outer end of the axis hole C3112 of the double-axis hole rotating arm 31 and is installed against the inner side of the axis hole D21 of the door frame fixing seat 2; the door hinge plate assembly 1, which includes a door hinge plate 11 and a positioning device A12; the positioning device A12 is arranged on the outer circle of the upper and lower axis holes B111 of the door hinge plate 11, and the door hinge plate 11 is provided with an outward boss 112 and a threaded hole 113 perpendicular to and intersecting the center line of the axis hole B111 on at least one side, and the threaded hole 113 passes through the hole wall of the axis hole B111, and the positioning device A12 is matched with the threaded hole 113 and installed on the outside, and the positioning device A12 includes an external threaded device body 121, a compression spring A122 and a steel ball A123; the shaft A4 is provided with at least one steel ball A123 positioning hole 41 at the circumferential position corresponding to the positioning device A12 to limit the door hinge plate 11 and the shaft A4 from rotating relative to each other or rotating into position.

[0040] The double-axis hole rotating arm assembly 3 at least includes a double-axis hole rotating arm 31 and a positioning device B32; the double-axis hole rotating arm 31 includes an axis hole A311, an axis hole C3112 and a connecting section 3115 between the axis hole A311 and the axis hole C3112, and the positioning device B32 is provided on the connecting section 3115; the double-axis hole rotating arm 31 is sequentially composed of the axis hole A311, the extended edge A312 of the axis hole A311, the bent outer corner A313, the arc surface A or the multi-fold surface A314, the connecting edge 315, a bent inner angle A316, an R-shaped arc or polygonal surface 317, a bent outer angle B318, a vertical edge A319, a bent outer angle C3110, an extended edge B3111 of the shaft hole C3112, and the shaft hole C3112, including a formed space groove A3113 and a space groove B3114; the space groove A3113 and the space groove B3114 are designed to accommodate the door leaf cover edge sealing strip, and the sealing strip does not need to be interrupted, thereby improving the airtightness of the frame and leaf joint.

[0041] The positioning device B32 at least includes a tubular device body 321, a compression spring B322, and a positioning head or steel ball B323. The tubular device body 321 is welded or riveted to the double-axis hole rotating arm 31 or is designed as an integral whole with the double-axis hole rotating arm 31.

[0042] The upper and lower supporting surfaces of the door frame fixing seat 2 are provided with at least an axis hole D21, a positioning head guide groove 22 of the positioning device B32, and a positioning hole A23, and at least an outwardly concave positioning head guide groove 22 and a positioning hole A23 are provided on the lower supporting surface. The positioning head guide groove 22 is designed so that when the door leaf is normally opened within 110 or 120 degrees, the door leaf first rotates around the axis B5 and opens to the extreme position of 110 or 120 degrees. The steel ball B of the positioning device B32 on the double-axis hole rotating arm assembly 3 guides and positions with the positioning hole A23 to act as a windproof door suction; or the door leaf first rotates around the axis A12 and opens to the extreme position of 110 or 120 degrees. The axis A12 is locked in place and drives the double-axis hole rotating arm assembly 3 to continue rotating around the axis B5 to increase the hinge opening angle.

[0043] When the door opens to an angle greater than 110 or 120 degrees, the bottom surface of the spatial slot B3114 of the dual-axis hole pivot arm 31 presses against the door frame, restricting the dual-axis hole pivot arm assembly 3 from rotating about axis B5. The door overcomes the locking force of the positioning device A12, allowing the door to continue rotating about axis A12, increasing the door opening angle, even to 180 degrees. Conversely, when closing, the door first rotates about axis A until the steel ball A123 of the positioning device A12 enters the positioning hole 41 on axis A4 and locks the dual-axis hole pivot arm assembly 3. The locking force of the positioning device A12 on the dual-axis hole pivot arm assembly 3 overcomes the locking force of the positioning device B32 on the dual-axis hole pivot arm assembly 3 and the locking hole A23 on the door frame fixing seat, causing the steel ball B323 to disengage the locking hole A23, and the door closes and resets.

[0044] Preferably, the door hinge plate 11 includes at least an axis hole B111 and a mounting foot plate 114 , and the mounting foot plate 114 is provided with at least one group of elongated or circular mounting holes A115 .

[0045] Preferably, the planar support member A6 and the planar support member B7 include a planar bearing structure of a sleeve plus a planar gasket or two planar gaskets with a copper gasket sandwiched between them, or a steel ball planar bearing or a simple planar gasket.

[0046] Preferably: the door frame fixing seat 2 is a box-type structure formed on three sides or an ear-type structure with a symmetrical support leg design; regardless of the box-type structure or the ear-type structure, its upper and lower supporting surfaces are provided with at least an axis hole D21, a positioning hole B24 of the positioning device B32 positioning head, a positioning hole C25 and a positioning hole A23; the door frame fixing seat 2 with the ear-type structure has at least a plurality of circular or elongated mounting holes B26 on its mounting legs.

[0047] Preferably: the double-axis hole arm assembly includes at least a double-axis hole arm 31 and a positioning device B32; the structural shape of the double-axis hole arm 31 can be a double-axis hole arm a31a; the double-axis hole arm a31a is composed of the axis hole A311, the extended edge A312 of the axis hole A311, the bent outer corner A313, the arc surface A or the multi-fold surface A314, the connecting edge 315, the bent inner corner A316, the short inclined surface 314a, the bent outer corner B315a, the straight edge 317a, the R bent outer corner D318a, the vertical edge A319, the bent outer corner C3110, the extended edge B3111 of the axis hole C3112, and the axis hole C3112, including the formed space groove A3113 and the space groove B3114.

[0048] Preferably: the double-axis hole rotating arm assembly includes at least a double-axis hole rotating arm 31 and a positioning device B32; the structural shape of the double-axis hole rotating arm 31 can be a double-axis hole rotating arm b31b; the double-axis hole rotating arm b31b is composed of the axis hole A311, the extended edge C311b of the axis hole A311, the bent outer corner A312b, the vertical edge B313b, the bent outer corner E314b connecting edge 315b, the bent inner corner A316, the R arc or polygonal surface 317, the bent outer corner B318, the vertical edge A319, the bent outer corner C3110, the extended edge B3111 of the axis hole C3112, and the axis hole C3112, including the formed space groove A3113 and the space groove B3114.

[0049] Preferably: the double-axis hole rotating arm assembly includes at least a double-axis hole rotating arm 31 and a positioning device B32; the structural shape of the double-axis hole rotating arm 31 can be a double-axis hole rotating arm c31c; the double-axis hole rotating arm c31c is composed of the axis hole A311, the extended edge C311b of the axis hole A311, the bent outer corner A312b, the vertical edge B313b, the connecting edge 315b of the bent outer corner E314b, the bent inner corner A316, the short inclined surface 314a, the bent outer corner B315a, the straight edge 317a, the R bent outer corner D318a, the vertical edge A319, the bent outer corner C3110, the extended edge B3111 of the axis hole C3112, and the axis hole C3112, including the formed space groove A3113 and the space groove B3114.

[0050] Preferably: the double-axis hole pivot arm assembly includes at least a double-axis hole pivot arm 31 and a positioning device B32; the structural shape of the double-axis hole pivot arm 31 can be a double-axis hole pivot arm d31d; the double-axis hole pivot arm d31d is composed of the axis hole A311, the extended edge D312d of the axis hole A311, the bent outer angle F313d, the arc surface B or the multi-fold surface B314d, the bent inner angle B315d, the R arc surface B or the multi-fold surface C316d, the R forming angle 317d, and the extended edge E318d of the axis hole C3112, including the forming space groove A3113 and the space groove B3114.

[0051] Finally, it should be noted that the above examples are merely preferred embodiments of the present invention. Clearly, the present invention is not limited to these examples and is subject to numerous variations. All variations of structure, principle, and shape (particularly the shape and structure of the dual-axis hole rotating arm) that can be directly derived or imagined by those skilled in the art from the disclosure of the present invention are considered to be within the scope of protection of the present invention.

Claims

1. A double-axis swing arm type concealed hinge, comprising a door leaf hinge plate assembly (1), a door frame fixing seat (2), a double-axis hole swing arm assembly (3), an axis A (4), an axis B (5), a plane support member A (6) and a plane support member B (7), wherein: The door hinge assembly (1) is connected to the end of the axis hole A (311) of the double-axis hole rotating arm assembly (3) through the axis A (4), the axis hole B (111) of the door hinge assembly (1) is rotatably connected to the axis A (4), and the axis A (4) is fixedly connected to the axis hole A (311) of the double-axis hole rotating arm (31) by a rivet pin or a fixing screw (13); the plane support member A (6) is provided outside or inside the axis hole A (311) of the double-axis hole rotating arm (31) The end is mounted against the inner or outer end of the axis hole B (111) of the door hinge plate (11); the door frame fixing seat (2) is rotatably connected to the axis hole C (3112) end of the double-axis hole rotating arm (31) through the axis B (5); the plane support member B (7) is provided at the outer end of the axis hole C (3112) of the double-axis hole rotating arm (31) and is mounted against the inner side of the axis hole D (21) of the door frame fixing seat (2); the double-axis hole rotating arm assembly (3) at least includes the double-axis hole rotating arm (31) and a positioning device B (32); the door hinge assembly (1) comprises a door hinge (11) and a positioning device A (12); the positioning device A (12) is arranged on the outer circle of the upper and lower shaft holes B (111) of the door hinge (11); at least one side of the door hinge (11) is provided with an outward boss (112) and a threaded hole (113) perpendicular to and intersecting the center line of the shaft hole B (111); the threaded hole (113) passes through the hole wall of the shaft hole B (111); the positioning device A (12) is matched with the threaded hole (113) and is installed on the outside; the positioning device A (12) comprises an external threaded device body (121), a compression spring A (122) and a steel ball A (123); the shaft A (4) is provided with at least one steel ball A (123) positioning hole (41) at a circumferential position corresponding to the positioning device A (12) to limit the door hinge (11) and the shaft A (4) from rotating relative to each other or rotating to a fixed position.

2. The double-axis rotating arm concealed hinge according to claim 1, characterized in that: The double-axis hole rotating arm (31) comprises an axis hole A (311), an axis hole C (3112) and a connecting section (3115) between the axis hole A (311) and the axis hole C (3112), and the positioning device B (32) is provided on the connecting section (3115); the double-axis hole rotating arm (31) is sequentially composed of the axis hole A (311), the extended edge A (312) of the axis hole A (311), the bent outer corner A (313), the arc surface A or the multi-folded surface A (314), the connecting edge (315), the bent inner corner A (316), the R arc or polygonal surface (317), the bent outer corner B (318), a vertical side A (319), a bent outer corner C (3110), an extended side B (3111) of the shaft hole C (3112), and the shaft hole C (3112), including a formed space groove A (3113) and a space groove B (3114); the positioning device B (32) at least includes a tubular device body (321), a compression spring B (322), a positioning head or a steel ball B (323), and the tubular device body (321) is welded or riveted to the connecting section (3115) of the double-axis hole rotating arm (31) or is designed as an integral whole with the connecting section (3115).

3. The double-axis rotating arm concealed hinge according to claim 1, characterized in that: The upper and lower supporting surfaces of the door frame fixing seat (2) are provided with at least an axis hole D (21), a positioning head guide groove (22) of a positioning device B (32), and a positioning hole A (23).

4. A double-axis rotating arm concealed hinge according to claim 1 or 2, characterized in that: The door hinge plate (11) comprises at least an axis hole B (111) and a mounting foot plate (114), wherein the mounting foot plate (114) is provided with at least a plurality of elongated or circular mounting holes A (115).

5. A double-axis rotating arm concealed hinge according to claim 1 or 2, characterized in that: The plane support member A (6) and the plane support member B (7) include a plane bearing structure of a sleeve plus a plane washer or a plane bearing structure of two plane washers with a copper washer sandwiched between them, or a steel ball plane bearing or a simple plane washer.

6. A double-axis rotating arm concealed hinge according to any one of claims 1, 2, and 3, characterized in that: The door frame fixing seat (2) is a box-type structure formed on three sides or an ear-type structure with symmetrical support legs; regardless of the box-type structure or the ear-type structure, at least an axis hole D (21), a positioning hole B (24) of a positioning device B (32) for the positioning head, a positioning hole C (25) and a positioning hole A (23) are provided on the upper and lower supporting surfaces; the door frame fixing seat (2) of the ear-type structure has at least a plurality of circular or elongated mounting holes B (26) on its mounting legs.

7. A double-axis rotating arm concealed hinge according to any one of claims 1, 2, and 3, characterized in that: The double-axis hole rotating arm (31) can be in the form of a double-axis hole rotating arm a (31a), which is composed of an axis hole A (311), an extension side A (312) of the axis hole A (311), a bent outer corner A (313), an arc surface A or a multi-fold surface A (314), a connecting side (315), a bent inner corner A (316), a short inclined surface (314a), a bent outer corner D (315a), a straight side (317a), an R-bent outer corner D (318a), a vertical side A (319), a bent outer corner C (3110), an extension side B (3111) of the axis hole C (3112), and the axis hole C (3112), and includes a formed space notch A (3113) and a space notch B (3114).

8. A double-axis rotating arm concealed hinge according to any one of claims 1, 2, and 3, characterized in that: The double-axis hole rotating arm (31) can be in the form of a double-axis hole rotating arm b (31b), which is composed of an axis hole A (311), an extension edge C (311b) of the axis hole A (311), a bent outer corner Ab (312b), a vertical edge B (313b), a connecting edge b (315b) of the bent outer corner E (314b), a bent inner corner A (316), an R-shaped arc or polygonal surface (317), a bent outer corner B (318), a vertical edge A (319), a bent outer corner C (3110), an extension edge B (3111) of the axis hole C (3112), and the axis hole C (3112), and includes a formed space notch A (3113) and a space notch B (3114).

9. A double-axis rotating arm concealed hinge according to any one of claims 1, 2, and 3, characterized in that: The double-axis hole rotating arm (31) can be in the form of a double-axis hole rotating arm c (31c), which is composed of an axis hole A (311), an extension edge C (311b) of the axis hole A (311), a bent outer corner Ab (312b), a vertical edge B (313b), a connecting edge b (315b) of the bent outer corner E (314b), a bent inner corner A (316), a short inclined surface (314a), a bent outer corner D (315a), a straight edge (317a), an R bent outer corner D (318a), a vertical edge A (319), a bent outer corner C (3110), an extension edge B (3111) of the axis hole C (3112), and the axis hole C (3112), and includes a formed space notch A (3113) and a space notch B (3114).

10. A double-axis rotating arm concealed hinge according to any one of claims 1, 2, and 3, characterized in that: The double-axis hole rotating arm (31) can be in the form of a double-axis hole rotating arm d (31d), which is composed of an axis hole A (311), an extended edge D (312d) of the axis hole A (311), a bent outer angle F (313d), an arc surface B or a multi-fold surface B (314d), a bent inner angle B (315d), an R-arc surface B or a multi-fold surface C (316d), an R-forming angle (317d), and an extended edge E (318d) of the axis hole C (3112), and includes a formed space notch A (3113) and a space notch B (3114).

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