Rotating arm type blind hinge

Abstract

The utility model discloses a rotating arm type blind hinge which comprises a rotating arm component, a door frame fixing seat, a shaft A, a door leaf hinge, a shaft B, a plane bearing A and a plane bearing B. The rotating arm component comprises a rotating arm assembly A, a rotating arm assembly B and a connecting screw; the rotating arm assembly A comprises a rotating arm A and a positioning device A, the rotating arm A comprises a fixing shaft hole A, a connecting part A and a connecting section A for connecting the fixing shaft hole A and the connecting part A, and the positioning device A is arranged on the connecting section A and is welded or riveted with the connecting section A or integrally designed with the connecting section A; the shaft B penetrates through an edge rolling shaft hole C of the door leaf hinge and a fixing shaft hole B of the rotating arm assembly B to be connected with the rotating arm component and is in running fit with the fixing shaft hole B; the shaft A penetrates through the fixing shaft hole D of the door frame fixing base and the fixing shaft hole A at the end A of the rotating arm assembly to be connected with the rotating arm component and rotationally matched with the fixing shaft hole A.

Description

Technical Field

[0001] The utility model relates to a rotary arm type concealed hinge, which belongs to hardware products. Background Art

[0002] Hinges are a crucial component of door products. Conventional swing arm hinges used in existing security doors feature concealed mounting with their pivots located within the door frame. The door leaf mounting base and swing arm are fixed and connected using multiple screws, making them difficult to disassemble and install. Furthermore, in recent years, the market demand for high-end security doors has led to an increasing adoption of concealed hinges. Concealed swing arm hinges are typically single-axis hinges with their pivots located within the door frame, commonly known as concealed swing arm hinges. Concealed swing arm hinges are welded to the door frame via a hinge box. Door leaf installation and commissioning are cumbersome, and the door leaf opening angle is limited, reaching a maximum of approximately 120 degrees. Therefore, developing a swing arm hinge that is easy to assemble, commission, and install, opens easily and flexibly, and can achieve an opening angle of 180 degrees is becoming increasingly important. Summary of the Invention

[0003] Based on the above-mentioned product defects and requirements, the technical problem to be solved by the present invention is to provide a rotary arm type concealed hinge structure that can enable the door leaf to open at an angle of up to 180 degrees.

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

[0005] A swing arm concealed hinge comprises a swing arm component, a door frame fixing seat, an axis A, a door leaf hinge, an axis B, a plane bearing A, and a plane bearing B. The swing arm component comprises a swing arm assembly A, a swing arm assembly B, and connecting screws; the swing arm assembly A comprises a swing arm A and a positioning device A. The swing arm A comprises a fixed shaft hole A, a connecting portion A, and a connecting section A connecting the fixed shaft hole A and the connecting portion A. The positioning device A is provided on the connecting section A and is welded, riveted, or integrally designed with the connecting section A.

[0006] The pivot arm assembly B includes a pivot arm B, a screw hole pressure plate, and a positioning device B. The pivot arm B includes a fixed shaft hole B, a connecting portion B, and a connecting section B connecting the fixed shaft hole B and the connecting portion B. The connecting section B is provided with at least two elongated positioning connection holes B. The screw hole pressure plate is provided with a clamping head that matches the elongated positioning connection holes B and is movably connected to the elongated positioning connection holes B to form a plug-in slot. The movable connection can quickly connect the connecting portion A of the pivot arm A with the connecting plug-in slot of the pivot arm B, making the installation and removal of the door leaf and door frame convenient. The connecting screw passes through the installation hole A on the connecting portion B and the threaded hole A on the screw hole pressure plate to connect and fix the pivot arm assembly A.

[0007] At least one outwardly projecting threaded hole B is provided on the outer side of the connecting and fixing axis hole B, perpendicular to and intersecting the centerline of the connecting and fixing axis hole B. The threaded hole B extends through the wall of the connecting and fixing axis hole B. A positioning device B is mounted on the outer side in conjunction with the threaded hole B. The positioning device B comprises an externally threaded device body, a compression spring, and a steel ball B. The positioning device B is designed to lock the door hinge and the pivot arm assembly from rotating about axis B when the door leaf is opened, while simultaneously driving the pivot arm assembly to rotate about axis A.

[0008] The shaft B passes through the rolled shaft hole C of the door hinge and the fixed shaft hole B of the swing arm assembly B to connect the swing arm component and the fixed shaft hole B for rotation. The two ends of the shaft B and the outer sides of the two ends of the rolled shaft hole C of the door hinge are welded or riveted to fix the connection and cannot rotate relative to each other. The shaft B and the positioning device B are circumferentially provided with positioning limit holes A at positions corresponding to the positioning device B. The positioning device B can limit the rotation of the door hinge relative to the swing arm component through the positioning limit holes A. When the door hinge rotates, it can drive the swing arm component to rotate clockwise or counterclockwise around the shaft A. The plane bearing B is arranged on the inner side of the rolled shaft hole C of the door hinge and is installed against the outer side of the fixed shaft hole B of the swing arm assembly B.

[0009] The shaft A passes through the fixed shaft hole D of the door frame fixing seat and the fixed shaft hole A at the end of the swing arm assembly A to connect the swing arm component, and rotates with the fixed shaft hole A. The plane bearing A is arranged on the inner side of the fixed shaft hole A of the door frame fixing seat and is installed against the outer side of the fixed shaft hole A of the swing arm assembly A; the two ends of the shaft A and the outer sides of the two ends of the fixed shaft hole D of the door frame fixing seat are welded or riveted and fixed.

[0010] The door frame mount comprises at least symmetrically designed upper and lower mounting feet and a supporting surface. The mounting feet are provided with a plurality of countersunk screw holes or circular mounting holes for connection to the door frame, facilitating installation and connection to the door frame. The upper and lower supporting surfaces are provided with fixed axis holes D, and at least the lower supporting surface is provided with an outwardly concave guide stop groove and positioning hole A. The guide stop groove and positioning hole A are designed so that when the door leaf is normally opened within 110 degrees, the steel ball A of the positioning device A on the pivot arm assembly A guides and aligns with the positioning hole A, acting as a windproof door suction. Furthermore, when the door leaf is opened beyond 110 degrees, the bottom surface of the clearance slot A of the pivot arm A contacts the pivot arm assembly of the door frame to restrict rotation about axis A. This overcomes the locking force of the positioning device B, allowing the door leaf to continue rotating about axis B, increasing the door opening angle, even to 180 degrees. Conversely, when the door leaf is closed, the locking force of the positioning device B on the pivot arm assembly B overcomes the locking force between the positioning device A on the pivot arm assembly A and the door frame, allowing the steel ball A to disengage from the positioning hole A, and the door leaf closes and resets.

[0011] Furthermore: the positioning device A includes a tubular device body, a compression spring A and a steel ball A. Steel balls A are provided at both ends of the axial hole of the tubular device body, and at least a compression spring A is provided between the two ends of the steel balls A. The tubular device body is shrunken to fix the steel balls A; the connecting section A between the positioning device A and the rotating arm A is fixed by welding or riveting or is designed as an integral part of the rotating arm A.

[0012] Furthermore, the pivot arm A includes a fixed axis hole A, a connecting portion A, and a connecting section A connecting the fixed axis hole A and the connecting portion A. The connecting portion A is provided with a plurality of hook-shaped opening elongated connecting holes B or closed elongated connecting holes C, or a combination of closed elongated connecting holes C and hook-shaped opening elongated connecting holes B. The hook-shaped opening connecting holes B facilitate the insertion and installation of the door frame pivot arm A and the door leaf side pivot arm B through the insertion slots, and at the same time, the lateral matching size of the door leaf and door frame can be adjusted.

[0013] Furthermore: the hinge plate of the door hinge includes at least one group of waist-shaped or circular mounting holes and a circular positioning hole B, and the waist-shaped mounting holes can adjust the longitudinal matching size between the door leaf and the door frame.

[0014] Furthermore, the structures of the plane bearings A and B are preferably a plane bearing structure of a sleeve plus two plane washers or a plane bearing structure of two plane washers with a copper washer in between, or a plane bearing structure of steel balls.

[0015] Further: the structural shape of the rotating arm A is a rotating arm a, including a fixed shaft hole A, a connecting part A and a connecting section A connecting the fixed shaft hole A and the connecting part A, and the connecting section A is composed of a rolled extension surface of the fixed shaft hole A, a bent outer corner A, a vertical surface A, an R-arc bent surface A, a bent edge A, a bent outer corner B, a short inclined surface A, a bent inner corner A, and an outward extending connecting part A to form a concave space groove A for making way.

[0016] Further: the structural shape of the rotating arm A is a rotating arm b, including a fixed shaft hole A, a connecting part A and a connecting section A connecting the fixed shaft hole A and the connecting part A, and the connecting section A is sequentially composed of the rolled extension surface of the fixed shaft hole A, the bent outer corner A, the vertical surface A, the bent outer corner C, the R arc forming surface, the bent inner corner B and the outward extending connecting part A to form a concave space groove A for making way.

[0017] The pivot arm component includes an integrally designed double-axis hole pivot arm c, which includes a fixed axis hole A, a fixed axis hole B and a connecting section C connecting the fixed axis hole A and the fixed axis hole B; its connecting section C is composed of the rolled extension surface of the fixed axis hole A, the bent outer corner A, the vertical surface A, the R-arc bent surface A, the bent edge A, the bent outer corner B, the short inclined surface A, the bent inner corner A, the bent edge B, the bent outer corner D vertical surface B, and the bent outer corner E connected to the fixed axis hole B to form a recessed concave space groove A and a recessed concave space groove B. The concave space groove can accommodate the door leaf cover edge sealing strip continuously, thereby improving the airtightness of the frame and leaf joint.

[0018] The pivot arm component includes an integrally designed double-axis hole pivot arm d, and the double-axis hole pivot arm d includes a fixed axis hole A, a fixed axis hole B and a connecting section D connecting the fixed axis hole A and the fixed axis hole B; its connecting section D is composed of the rolled extension surface of the fixed axis hole A, the bent outer angle A, the vertical surface A, the bent outer angle C, the R arc forming surface, the bent edge B, the bent inner angle B, the vertical surface B, and the bent outer angle E connected to the fixed axis hole B to form a recessed concave space groove A and a recessed concave space groove B. The concave space groove can continuously accommodate the door leaf cover edge sealing strip, thereby improving the airtightness of the frame and leaf joint.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, the concealed hinge of the present invention comprises a pivot arm assembly comprising a pivot arm assembly A and a pivot arm assembly B. The pivot arm assembly A is connected to the door frame, while the pivot arm assembly B is connected to the door leaf. The pivot arm assembly A is connected to the pivot arm assembly B via an outwardly extending connection portion A, allowing for quick installation of the door leaf and door frame, and allowing for adjustment of the distance between the fixing holes of the pivot arm assembly A and the pivot arm assembly B. This structural design is rational, simple, and easy to disassemble and install.

[0021] Secondly, if the hidden hinge of the present invention is designed as a double-axis hole arm c or double-axis hole arm d structure, its recessed concave space groove B can accommodate the door cover edge sealing strip continuously, thereby improving the airtight performance of the frame-leaf joint.

[0022] Thirdly, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional structural diagram illustrating the concealed hinge of the present invention.

[0024] Figure 2This is a three-dimensional diagram illustrating the exploded structure of the concealed hinge of the present invention.

[0025] Figure 3 This is a cross-sectional structural diagram of the rotating arm component of the concealed hinge of the present invention.

[0026] Figure 4 This is a diagram illustrating the structural features of the arm components.

[0027] Figure 5 This is a diagram illustrating the structural features of the arm assembly A.

[0028] Figure 6 This is a three-dimensional exploded diagram illustrating the structural features of the arm assembly B.

[0029] Figure 7 This is a diagram illustrating the structural features of positioning device A.

[0030] Figure 8 This is a diagram illustrating the axial structural features of the rotating arm assembly B and its installation relationship with the door leaf and door frame.

[0031] Figure 9 This is a diagram illustrating the structural features of arm A.

[0032] Figure 10 Figure 1 is an illustration of the structural features of the rotating arm A.

[0033] Figure 11 Figure 2 is an illustration of the forming structural features of the rotating arm A.

[0034] Figure 12 This is a diagram illustrating the structural features of the door frame fixing seat.

[0035] Figure 13 This is a diagram illustrating the structural features of a door hinge.

[0036] Figure 14 This is a diagram illustrating the structural features of the double-axis hole rotating arm C.

[0037] Figure 15 This is a diagram illustrating the structural features of the double-axis hole arm D.

[0038] Figure 16 This is a diagram illustrating the installation relationship between the concealed hinge and the door leaf and door frame of the utility model. DETAILED DESCRIPTION

[0039] Refer to the attached Figures 1-16 , the utility model is further described with reference to the embodiments:

[0040] A pivoting arm concealed hinge comprises a pivoting arm component 1, a door frame fixing seat 2, an axis A3, a door leaf hinge 4, an axis B5, a plane bearing A6, and a plane bearing B7. The pivoting arm component 1 comprises a pivoting arm assembly A1-1, a pivoting arm assembly B1-2, and a connecting screw 1-3. The pivoting arm assembly A1-1 comprises a pivoting arm A1-1-1 and a positioning device A1-1-2. The pivoting arm A1-1-1 comprises a fixed axis hole A1-1-1-1, a connecting portion A1-1-1-2, and a connecting section A1-1-1-3 connecting the fixed axis hole A1-1-1-1 and the connecting portion A1-1-1-2. The positioning device A1-1-2 is provided on the connecting section A1-1-1-3 and is welded, riveted, or integrally designed with the connecting section A1-1-1-3.

[0041] The arm assembly B1-2 includes a arm B1-2-1, a screw hole pressure plate 1-2-2, and a positioning device B1-2-3. The arm B1-2-1 includes a fixed shaft hole B1-2-1-5, a connecting portion B1-2-1-1, and a connecting section B1-2-1-2 connecting the fixed shaft hole B1-2-1-5 and the connecting portion B1-2-1-1. The connecting section B1-2-1-2 is provided with a plurality of elongated positioning connection holes A1-2-1-8. The screw hole pressure plate 1-2-2 is provided with a plurality of elongated positioning connection holes A1-2-1-8. The clamping head 1-2-2-2 matching the positioning connection hole A1-2-1-8 is movably connected with the elongated positioning connection hole A1-2-1-8 to form a plug-in slot 1-2-4; the connecting part A1-1-1-2 of the rotating arm A1-1-1 of the rotating arm assembly A1-1 is connected to the plug-in slot 1-2-4, and the connecting screw 1-3 passes through the mounting hole A1-2-1-4 on the connecting part B1-2-1-1 and is connected to the threaded hole A1-2-2-1 on the screw hole pressure plate 1-2-2 to fix the rotating arm assembly A1-1. At least one outward boss 1-2-1-7 and a threaded hole B1-2-1-3 are provided on the outer side 1-2-1-6 of the connecting and fixing shaft hole B1-2-1-5, which are perpendicular to and intersect the center line of the connecting and fixing shaft hole B1-2-1-5. The threaded hole B1-2-1-3 passes through the hole wall of the connecting and fixing shaft hole B1-2-1-5, and the positioning device B1-2-3 is installed on the outer side in cooperation with the threaded hole B1-2-1-3.

[0042] The positioning device B1-2-3 includes an external threaded device body 1-2-3-1, a compression spring 1-2-3-2 and a steel ball B1-2-3-3; the shaft B5 passes through the rolled shaft hole C4-1 of the door hinge 4 and the fixed shaft hole B1-2-1-5 of the swing arm assembly B1-2, and connects the swing arm component 1 and the fixed shaft hole B1-2-1-5 for rotational cooperation. The two ends of the shaft B5 and the outer sides of the rolled shaft hole C4-1 of the door hinge 4 are welded or riveted to be fixedly connected. The shaft B5 and the positioning device B1-2-3 are circumferentially provided with positioning limit holes A5-1 at the corresponding positions. The positioning device B1-2-3 limits the rotation of the door hinge 4 relative to the swing arm component 1, and the horizontal The surface bearing B7 is arranged on the inner side of the rolled axis hole C4-1 of the door hinge 4 and is installed against the outer side of the fixed axis hole B1-2-1-5 of the rotating arm assembly B1-2; the shaft A3 passes through the fixed axis hole D2-2-1 of the door frame fixing seat 2 and the fixed axis hole A1-1-1-1 at the end of the rotating arm assembly A1-1 to connect the rotating arm component 1 and the fixed axis hole A1-1-1-1 for rotational cooperation, and the plane bearing A6 is arranged on the inner side of the fixed axis hole A1-1-1-1 of the door frame fixing seat 2 and is installed against the outer side of the fixed axis hole A1-1-1-1 of the rotating arm assembly A1-1; the two ends of the shaft A3 and the outer sides of the two ends of the fixed axis hole D2-2-1 of the door frame fixing seat 2 are welded or riveted and fixed.

[0043] The door frame fixing seat 2 is provided with upper and lower mounting foot plates 2-1 and a supporting surface 2-2 of symmetrical design. The mounting foot plate 2-1 is provided with a plurality of countersunk screw holes or circular mounting fixing holes 2-1-1 connected to the door frame. The upper and lower supporting surfaces 2-2 are provided with a fixed shaft hole D2-2-1, and at least the lower end is provided with an outwardly concave guide limit groove 2-2-2 and a positioning hole A2-2-3.

[0044] Preferably: the positioning device A1-1-2 includes a tubular device body 1-1-2-1, a compression spring A1-1-2-2 and a steel ball A1-1-2-3. Steel balls A1-1-2-3 are provided at both ends of the axial hole of the tubular device body 1-1-2-1. At least a compression spring A1-1-2-2 is provided between the two ends of the steel balls A1-1-2-3. The steel balls A1-1-2-3 are fixed by shrinking at both ends of the tubular device body 1-1-2-1. The connecting section A1-1-1-3 of the positioning device A1-1-2 and the rotating arm A1-1-1 is fixed by welding or riveting or is integrally designed with the rotating arm A1-1-1.

[0045] Preferably: the rotating arm A1-1-1 includes a fixed shaft hole A1-1-1-1, a connecting part A1-1-1-2 and a connecting section A1-1-1-3 connecting the fixed shaft hole A1-1-1-1 and the connecting part A1-1-1-2, and the connecting part A1-1-1-2 is provided with at least a plurality of hook-shaped open connecting holes B1-1-1-4 and at least one closed connecting hole C1-1-1-5 or a group of open long connecting holes B1-1-1-4 or a group of closed long connecting holes C1-1-1-5.

[0046] Preferably, the hinge plate of the door hinge 4 includes at least one group of waist-shaped or circular mounting holes 4-2 and one circular positioning hole B4-3.

[0047] Preferably, the structures of the plane bearing A6 and the plane bearing B7 are preferably a plane bearing structure of a sleeve plus two plane washers or a plane bearing structure of two plane washers with a copper washer in between, or a plane bearing structure with steel balls or a plane washer.

[0048] Preferably: the structural shape of the rotating arm A1-1-1 is a rotating arm a, including a fixed shaft hole A1-1-1-1, a connecting part A1-1-1-2 and a connecting section A1-1-1-3 connecting the fixed shaft hole A1-1-1-1 and the connecting part A1-1-1-2; its connecting section A1-1-1-3 is composed of the rolled extension surface 8 of the fixed shaft hole A1-1-1-1, the bent outer corner A9, the vertical surface A10, the R-arc-shaped bending surface A11, the bent edge A12, the bent outer corner B13, the short inclined surface A14, the bent inner corner A15, and the outward-extending connecting part A1-1-1-2 to form a concave space groove 17.

[0049] Preferably: the structural shape of the rotating arm A1-1-1 is a rotating arm b, including a fixed shaft hole A1-1-1-1, a connecting part A1-1-1-2 and a connecting section A1-1-1-3 connecting the fixed shaft hole A1-1-1-1 and the connecting part A1-1-1-2; its connecting section A1-1-1-3 is composed of the rolled extension surface 8 of the fixed shaft hole A1-1-1-1, the bent outer corner A9, the vertical surface A10, the bent outer corner C18, the R-arc forming surface 19, the bent inner corner B20 and the outward extending connecting part A1-1-1-2 to form a recessed concave space groove 17.

[0050] Preferably: the rotating arm component 1 includes an integrally designed double-axis hole rotating arm c, and the double-axis hole rotating arm c includes a fixed axis hole A1-1-1-1 and a connecting section C16 connecting the fixed axis hole A1-1-1-1 and the fixed axis hole B1-2-1-5; its connecting section C16 is composed of the rolled extension surface 8 of the fixed axis hole A1-1-1-1, the bent outer corner A9, the vertical surface A10, the R-arc bent surface A11, the bent edge A12, the bent outer corner B13, the short inclined surface A14, the bent inner corner A15, the bent edge B21, the bent outer corner D22, the vertical surface B25, and the bent outer corner E26 connected to the fixed axis hole B1-2-1-5 to form a recessed concave space groove A23 and a recessed concave space groove B24.

[0051] Preferably: the rotating arm component 1 includes an integrally designed double-axis hole rotating arm d, and the double-axis hole rotating arm d includes a fixed axis hole A1-1-1-1, a fixed axis hole B1-2-1-5 and a connecting section D16a connecting the fixed axis hole A1-1-1-1 and the fixed axis hole B1-2-1-5, and the connecting section D16a is composed of the rolled extension surface 8 of the fixed axis hole A1-1-1-1, the bent outer corner A9, the vertical surface A10, the bent outer corner C18, the R arc forming surface 19, the bent inner corner B20, the bent edge B21, the bent outer corner D22, the vertical surface B25, and the bent outer corner E26 connected to the fixed axis hole B1-2-1-5 to form a recessed concave space groove A23 and a recessed concave space groove B24.

[0052] Finally, it should be noted that the above examples are merely preferred embodiments of the present invention. Obviously, the present invention is not limited to the above examples and many variations are possible. All variations of structure, principle, and shape (particularly the shape and structure of the rotating arm) that can be directly derived or imagined by a person 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 swing arm type concealed hinge, comprising a swing arm component (1), a door frame fixing seat (2), a shaft A (3), a door leaf hinge (4), a shaft B (5), a plane bearing A (6) and a plane bearing B (7), wherein: The rotating arm component (1) comprises a rotating arm assembly A (1-1), a rotating arm assembly B (1-2) and a connecting screw (1-3); the rotating arm assembly A (1-1) comprises a rotating arm A (1-1-1), a positioning device A (1-1-2), the rotating arm A (1-1-1) comprises a fixed shaft hole A (1-1-1-1), a connecting portion A (1-1-1-2) and a connecting section A (1-1-1-3) connecting the fixed shaft hole A (1-1-1-1) and the connecting portion A (1-1-1-2), the positioning device A (1-1-2) is provided on the connecting section A (1-1-1-3) and is connected to the connecting section A (1-1 -1-3) welding or riveting or overall design; the arm assembly B (1-2) includes an arm B (1-2-1), a screw hole pressure plate (1-2-2), and a positioning device B (1-2-3); the arm B (1-2-1) includes a fixed shaft hole B (1-2-1-5), a connecting portion B (1-2-1-1), and a connecting section B (1-2-1-2) connecting the fixed shaft hole B (1-2-1-5) and the connecting portion B (1-2-1-1); the connecting section B (1-2-1-2) is provided with a plurality of elongated positioning connection holes A (1-2-1-8); the screw hole pressure plate (1-2 ...9); the elongated positioning connection holes A (1-2-1-10) are provided with a plurality of elongated positioning connection holes A (1-2-1-111); the elongated positioning connection holes A (1-2-1-112) are provided with a plurality of elongated positioning connection holes A (1-2-1-112); the elongated positioning connection holes A (1-2-1-10) are provided with a plurality of elongated positioning connection holes A (1-2-1-111); the elongated positioning connection holes A (1-2-1-10) are provided with a plurality of elongated positioning connection holes A (1-2-1-8); the elongated positioning connection holes A (1-2-1-9) are provided with a plurality of elongated positioning connection holes A (1-2-1-9); the elongated positioning connection holes A (1-2-1-10) are provided with a plurality of elongated positioning connection holes A (1-2-1-10); the elongated positioning connection holes A (1-2-1-10) are provided with a The chuck (1-2-2-2) matched with the positioning connection hole A (1-2-1-8) is movably connected with the elongated positioning connection hole A (1-2-1-8) to form a plug-in slot (1-2-4); the connecting portion A (1-1-1-2) of the rotating arm assembly A (1-1-1) is connected to the plug-in slot (1-2-4), and the connecting screw (1-3) passes through the mounting hole A (1-2-1-4) on the connecting portion B (1-2-1-1) and is connected to the threaded hole A (1-2-2-1) on the screw hole pressure plate (1-2-2) to fix the rotating arm assembly A (1-1); the connecting fixing shaft hole B (1 -2-1-5) is provided on the outer side (1-2-1-6) of the fixing shaft hole B (1-2-1-5) with at least one outward boss (1-2-1-7) and a threaded hole B (1-2-1-3) perpendicular to and intersecting the center line of the fixing shaft hole B (1-2-1-5), the threaded hole B (1-2-1-3) passing through the hole wall of the fixing shaft hole B (1-2-1-5), the positioning device B (1-2-3) being matched with the threaded hole B (1-2-1-3) and mounted on the outer side, the positioning device B (1-2-3) comprising an external threaded device body (1-2-3-1), a compression spring (1-2-3-2) and a steel ball B (1-2-3-3);The shaft B (5) passes through the rolled shaft hole C (4-1) of the door hinge (4) and the fixed shaft hole B (1-2-1-5) of the arm assembly B (1-2) to connect the arm assembly (1) and the fixed shaft hole B (1-2-1-5) for rotational cooperation. The two ends of the shaft B (5) and the outer sides of the rolled shaft hole C (4-1) of the door hinge (4) are welded or riveted to be fixedly connected. The shaft B (5) is provided with a positioning limit hole A (5-1) in the circumferential direction at the corresponding position of the positioning device B (1-2-3). The positioning device B (1-2-3) limits the door hinge (4) from rotating relative to the arm assembly (1). The plane bearing B (7) is provided on the inner side of the rolled shaft hole C (4-1) of the door hinge (4) and is connected to the fixed shaft hole B (1-2-1-5). The outer side of the fixed shaft hole B (1-2-1-5) of the rotating arm assembly B (1-2) is mounted against each other; the shaft A (3) passes through the fixed shaft hole D (2-2-1) of the door frame fixing seat (2) and the fixed shaft hole A (1-1-1-1) at the end of the rotating arm assembly A (1-1) to connect the rotating arm component (1) and rotate with the fixed shaft hole A (1-1-1-1); the plane bearing A (6) is provided on the inner side of the fixed shaft hole A (1-1-1-1) of the door frame fixing seat (2) and is mounted against the outer side of the fixed shaft hole A (1-1-1-1) of the rotating arm assembly A (1-1); the two ends of the shaft A (3) and the outer sides of the two ends of the fixed shaft hole D (2-2-1) of the door frame fixing seat (2) are welded or riveted and fixed.

2. The rotary arm concealed hinge according to claim 1, characterized in that: The door frame fixing seat (2) comprises at least symmetrically designed upper and lower mounting foot plates (2-1) and a supporting surface (2-2); the mounting foot plates (2-1) are provided with a plurality of countersunk screw holes or circular mounting fixing holes (2-1-1) connected to the door frame; the upper and lower supporting surfaces (2-2) are provided with a fixing shaft hole D (2-2-1), and at least a lower end is provided with an outwardly concave guide limit groove (2-2-2) and a positioning hole A (2-2-3).

3. A rotary arm concealed hinge according to claim 1 or 2, characterized in that: The positioning device A (1-1-2) comprises a tubular device body (1-1-2-1), a compression spring A (1-1-2-2) and a steel ball A (1-1-2-3); steel balls A (1-1-2-3) are provided at both ends of the axial hole of the tubular device body (1-1-2-1); at least a compression spring A (1-1-2-2) is provided between the two ends of the steel balls A (1-1-2-3); the tubular device body (1-1-2-1) is shrunken to fix the steel balls A (1-1-2-3); a connecting section A (1-1-1-3) between the positioning device A (1-1-2) and the rotating arm A (1-1-1) is fixed by welding or riveting or is designed as an integral whole with the rotating arm A (1-1-1).

4. A rotary arm concealed hinge according to claim 1 or 2, characterized in that: The rotating arm A (1-1-1) comprises a fixed shaft hole A (1-1-1-1), a connecting portion A (1-1-1-2) and a connecting section A (1-1-1-3) connecting the fixed shaft hole A (1-1-1-1) and the connecting portion A (1-1-1-2), wherein the connecting portion A (1-1-1-2) is provided with at least a plurality of hook-shaped open connecting holes B (1-1-1-4) and at least one closed connecting hole C (1-1-1-5) or a group of open elongated connecting holes B (1-1-1-4) or a group of closed elongated connecting holes C (1-1-1-5).

5. The rotary arm concealed hinge according to claim 1 or 2, characterized in that: The hinge plate of the door hinge (4) comprises at least a group of waist-shaped or circular mounting holes (4-2) and a circular positioning hole B (4-3).

6. A rotating arm concealed hinge according to claim 1 or 2, characterized in that: The plane bearing A (6) and the plane bearing B (7) are a plane bearing structure with a shaft sleeve and two plane washers or a plane bearing structure with a copper washer sandwiched between two plane washers or a plane bearing structure with steel balls.

7. A rotary arm concealed hinge according to any one of claims 1 and 2, characterized in that: The structure of the rotating arm A (1-1-1) is a rotating arm a, comprising a fixed shaft hole A (1-1-1-1), a connecting portion A (1-1-1-2) and a connecting section A (1-1-1-3) connecting the fixed shaft hole A (1-1-1-1) and the connecting portion A (1-1-1-2); the connecting section A (1-1-1-3) is sequentially composed of a rolled extension surface (8) of the fixed shaft hole A (1-1-1-1), a bent outer corner A (9), a vertical surface A (10), an R-shaped arc-shaped bending surface A (11), a bending edge A (12), a bent outer corner B (13), a short inclined surface A (14), a bent inner corner A (15), and a concave space groove (17) formed by the connecting portion A (1-1-1-2) extending outward.

8. The pivot-arm concealed hinge according to any one of claims 1 and 2, wherein: The structure of the rotating arm A (1-1-1) is a rotating arm b, comprising a fixed shaft hole A (1-1-1-1), a connecting portion A (1-1-1-2), and a connecting section B (1-2-1-2) connecting the fixed shaft hole A (1-1-1-1) and the connecting portion A (1-1-1-2); The connecting section A (1-1-1-3) is composed of a rolled extension surface (8) of the fixed shaft hole A (1-1-1-1), a bent outer corner A (9), a vertical surface A (10), a bent outer corner C (18), an R-shaped arc-shaped surface (19), a bent inner corner B (20) and a connecting portion A (1-1-1-2) extending outward to form a recessed space groove (17).

9. The rotary arm concealed hinge according to claim 1 or 2, characterized in that: The arm member (1) includes an integrally designed double-axis hole arm c, wherein the double-axis hole arm c includes a fixed axis hole A (1-1-1-1) and a connecting section C (16) connecting the fixed axis hole A (1-1-1-1) and the fixed axis hole B (1-2-1-5); the connecting section C (16) is sequentially composed of a rolled extension surface (8) of the fixed axis hole A (1-1-1-1), a bent outer corner A (9), a vertical surface A (1 0), R-shaped arc-shaped bending surface A (11), bending edge A (12), bending outer corner B (13), short inclined surface A (14), bending inner corner A (15), bending edge B (21), bending outer corner D (22), vertical surface B (25), bending outer corner E (26) are connected to the fixed shaft hole B (1-2-1-5) to form the recessed space groove A (23) and the recessed space groove B (24).

10. The rotary arm concealed hinge according to claim 1 or 2, characterized in that: The arm member (1) includes an integrally designed double-axis hole arm d, wherein the double-axis hole arm d includes a fixed axis hole A (1-1-1-1), a fixed axis hole B (1-2-1-5), and a connecting section D (16a) connecting the fixed axis hole A (1-1-1-1) and the fixed axis hole B (1-2-1-5). The connecting section D (16a) is sequentially composed of a rolled extension surface (8) of the fixed axis hole A (1-1-1-1), a bent outer corner A (9), a vertical surface A (10), a bent outer corner C (18), an R-arc forming surface (19). , the bent inner corner B (20), the bent edge B (21), the bent outer corner D (22), the vertical surface B (25), the bent outer corner E (26) are connected to the fixed shaft hole B (1-2-1-5) to form the recessed concave space groove A (23) and the recessed concave space groove B (24).

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