Three-dimensional adjustable door and window hinge

By setting three-dimensional adjustment components on the fixing and mounting seats of the door and window hinges, the problems of window sash wear and poor sealing are solved, and a stable connection and improved sealing between the window sash and the window frame are achieved.

CN224565942UActive Publication Date: 2026-07-28RUIAN ZHONGLI DOOR & WINDOW HARDWARE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
RUIAN ZHONGLI DOOR & WINDOW HARDWARE CO LTD
Filing Date
2025-08-13
Publication Date
2026-07-28

AI Technical Summary

Technical Problem

The adjustment mechanism of existing door and window hinges is located on the support arm, which leads to wear on the window sash, poor connection stability, and insufficient sealing.

Method used

A three-dimensional adjustable door and window hinge is designed. By setting the first, second, and third adjustment components on the fixed seat and the mounting seat, the position of the connecting rod assembly and the adjusting component can be adjusted along the X, Y, and Z axes, respectively, to achieve three-dimensional adjustment of the window sash and enhance connection stability and sealing.

Benefits of technology

It improves the connection stability and sealing between the window sash and the window frame, ensures the smoothness and precision of the window sash's rotation opening and closing, is suitable for installation in smaller spaces, and enhances the applicability and sealing of the hinges.

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Abstract

This utility model discloses a three-dimensional adjustable door and window hinge, comprising a fixed base, a connecting rod assembly, and a mounting base. One end of the connecting rod assembly is linked to the fixed base, and the other end is linked to the mounting base. The hinge is characterized by: a first adjusting component on the fixed base, an adjusting seat on the mounting base, an adjusting element linked to the adjusting seat, and a second and third adjusting component on the adjusting seat. The first adjusting component can drive the connecting rod assembly to move along the X-axis of the fixed base; the second adjusting component can drive the adjusting element to move relative to the adjusting seat along the Y-axis of the mounting base; and the third adjusting component can drive the adjusting element to move along the Z-axis of the mounting base. The first adjusting component, mounted on the fixed base and linked to the connecting rod assembly, can directly adjust the distance between the mounting base and the window frame, thereby adjusting the sealing distance between the window sash and the window frame. This maintains the firmness of the connection between the mounting base, adjusting seat, adjusting element, and window sash, making the rotation and opening / closing of the window sash more stable.
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Description

Technical Field

[0001] This utility model relates to the field of door and window technology, specifically to a three-dimensional adjustable door and window hinge. Background Technology

[0002] Door and window hinges are an important component of the door and window installation structure. Doors and windows can only be movably connected to the door frame through door and window hinges.

[0003] Chinese utility model patent publication number "CN220285550U" discloses a hinge and a window, which includes a mounting base, a support arm, and a connecting rod assembly. The connecting rod assembly is hinged to the mounting base and the support arm respectively, so that the support arm can move relative to the mounting base along a preset trajectory. The mounting base is used to connect to the window frame, and the support arm is used to connect to the window sash. It also includes an adjustment mechanism connected to the support arm. The adjustment mechanism includes a movable block, a first adjustment member, a second adjustment member, and a third adjustment member. The first adjustment member, the second adjustment member, and the third adjustment member are used to adjust the movable block to move relative to the mounting base along the Z-axis, X-axis, and Y-axis directions respectively.

[0004] However, the adjustment mechanism is located on the support arm, as per the instruction manual. Figure 5 It can be seen that the adjustment mechanism actually adjusts the relative position of the movable block relative to the support arm. That is, the first adjustment component adjusts the sliding block to move along the Y-axis of the support arm, the second adjustment component adjusts the movable block to move along the X-axis of the support arm, and the third adjustment component adjusts the movable block to move along the Z-axis. The movable block is detachably connected to the window sash. During the movement of the window sash, the second adjustment component will wear down, the connection stability will decrease, the window sash will be prone to shaking, and the window sash will have poor sealing performance.

[0005] Therefore, it is necessary to improve upon the aforementioned shortcomings. Utility Model Content

[0006] The purpose of this invention is to provide a three-dimensional adjustable door and window hinge that provides a stable connection between the window sash and the window frame while maintaining the stability and sealing of the window sash installation, in order to solve the above-mentioned problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a three-dimensional adjustable door and window hinge, including a fixed base, a connecting rod assembly, and a mounting base. One end of the connecting rod assembly is linked to the fixed base, and the other end is linked to the mounting base. The fixed base is equipped with a first adjustment component, which drives the connecting rod assembly to move along the X-axis of the fixed base. The mounting base is equipped with an adjustment seat, which is linked to an adjustment component. The adjustment seat is equipped with a second adjustment component for moving the adjustment component along the Y-axis of the mounting base and a third adjustment component for moving the adjustment component along the Z-axis of the mounting base.

[0008] By adopting the above technical solution: the first adjustment component can drive the linkage component to move along the X-axis direction of the fixed seat, thereby adjusting the position of the mounting seat relative to the fixed seat, realizing the first-dimensional adjustment of the window sash installed on the mounting seat; the second adjustment component can drive the adjustment component to move relative to the adjustment seat along the Y-axis direction of the mounting seat, thereby adjusting the position of the window sash relative to the mounting seat, realizing the second-dimensional adjustment of the window sash; the third adjustment component moves along the Z-axis direction of the mounting seat, thereby changing the height of the adjustment seat relative to the fixed seat, thereby adjusting the installation height of the window sash, realizing the third-dimensional adjustment of the window sash. Furthermore, the first adjustment component is set on the fixed seat and linked with the linkage component, which can directly adjust the distance between the mounting seat and the window frame, thereby adjusting the sealing distance between the window sash and the window frame, maintaining the firmness of the connection between the mounting seat, adjustment seat, adjustment component and window sash, making the rotation and opening and closing of the window sash more stable.

[0009] The aforementioned three-dimensional adjustable door and window hinge can be further configured as follows: the first adjustment component includes an adjustment plate and an adjustment eccentric bolt. The adjustment plate is located on the side of the fixed seat opposite to the connecting rod assembly. The fixed seat has several sets of first sliding grooves along the X-axis and a second sliding groove along the Y-axis. The connecting rod assembly slides with the first sliding groove and is linked with the adjustment plate. The adjustment eccentric bolt slides with the second sliding groove and is hinged to the adjustment plate. The rotation of the adjustment eccentric bolt drives the adjustment plate to move axially along the second sliding groove, causing the connecting rod assembly to move axially along the first sliding groove.

[0010] By adopting the above technical solution: when the eccentric bolt is rotated for adjustment, its eccentric structure drives the adjustment plate to move along the Y-axis direction of the fixed seat (i.e., the axial direction of the second slide groove). Since the adjustment plate is linked with the connecting rod assembly, the adjustment plate synchronously drives the connecting rod assembly to slide synchronously along the X-axis direction of the fixed seat (i.e., the axial direction of the first slide groove), thereby adjusting the X-axis position of the mounting seat and the window sash on it. During adjustment, only a single adjustment eccentric bolt needs to be operated, which is simple and quick. At the same time, the adjustment plate and the slide groove structure evenly transmit the adjustment to the connecting rod assembly, ensuring the rigidity and stability of the first adjustment assembly during the adjustment process, effectively maintaining the accuracy of the sealing distance adjustment between the window sash and the window frame, as well as the smoothness of the opening and closing action of the window sash.

[0011] The aforementioned three-dimensional adjustable door and window hinge can be further configured such that: the fixed base is provided with an adjustment groove, the adjustment plate is provided with an adjustment protrusion, and the adjustment protrusion passes through the adjustment groove and slides in cooperation with the adjustment groove.

[0012] By adopting the above technical solution, the adjusting convex plate and the adjusting groove slide together. When the adjusting plate moves the connecting rod assembly, the adjusting convex plate moves synchronously in the adjusting groove to guide and limit the adjusting plate, preventing the adjusting plate from swaying and shaking during movement, and improving the stability of the adjusting plate relative to the fixed seat.

[0013] The aforementioned three-dimensional adjustable door and window hinge can be further configured as follows: the second adjustment component includes a first adjustment bolt and an adjustment support plate. The adjustment support plate is disposed on the adjustment component. The adjustment seat has a first adjustment groove. The adjustment support plate is slidably engaged with the first adjustment groove. A second adjustment groove is disposed at the bottom of the first adjustment groove. The adjustment support plate has an adjustment protrusion. The adjustment protrusion passes through the second adjustment groove and is slidably engaged with the second adjustment groove. The first adjustment bolt is threadedly connected to the adjustment protrusion. A third adjustment groove is disposed on the side wall of the adjustment seat, which is connected to the first adjustment groove. A limiting slide groove is disposed on the side wall of the third adjustment groove, which engages with the first adjustment bolt. The head of the first adjustment bolt is slidably engaged with the limiting slide groove, and the bolt end abuts against the side wall of the second adjustment groove opposite to the third adjustment groove.

[0014] By adopting the above technical solution: rotating the first adjusting bolt can drive the adjusting protrusion to move along the axial direction of the first adjusting bolt in the second adjusting groove, and drive the adjusting support plate to slide in the first adjusting groove, thereby realizing the position adjustment of the adjusting component along the Y-axis of the mounting base. Furthermore, the head of the second adjusting bolt is located in the third adjusting groove, and its edge slides in cooperation with the limiting slide groove, which can limit the axial movement of the second adjusting bolt, prevent the second adjusting bolt from moving axially, improve the stability of the second adjusting assembly, and at the same time, allow for fine adjustment of the distance between the adjusting component and the adjusting base, thereby increasing the versatility of the position adjustment of the adjusting component.

[0015] The aforementioned three-dimensional adjustable door and window hinge can be further configured as follows: the third adjustment component includes an adjustment column and a second adjustment bolt, the adjustment seat has an adjustment hole through it, the adjustment column passes through the adjustment hole, the second adjustment bolt passes through the adjustment hole and is threadedly connected to the adjustment hole, one end of the adjustment column is fixedly connected to the connecting rod assembly, and the other end abuts against the second adjustment bolt, and the rotation of the second adjustment bolt causes the adjustment seat to move along the Z-axis direction of the mounting seat.

[0016] By adopting the above technical solution: one end of the adjusting column is linked to the connecting rod assembly, and the other end is inserted into the adjusting hole. The end of the second adjusting bolt in the adjusting hole can abut against the end of the adjusting column. Rotating the second adjusting bolt can drive the adjusting seat to move along the axial direction of the second adjusting bolt, raising the mounting seat and realizing the position adjustment of the window sash along the Z-axis direction of the mounting seat.

[0017] The aforementioned three-dimensional adjustable door and window hinge can be further configured as follows: the linkage assembly includes a first linkage, a second linkage, a third linkage, and a fourth linkage. One end of the first linkage is hinged to a fixed seat, and the other end is hinged to the end of the third linkage. One end of the third linkage relative to the first linkage is hinged to a mounting seat. One end of the second linkage is hinged to a mounting seat, and the other end is hinged to the end of the fourth linkage. One end of the fourth linkage relative to the second linkage is hinged to a fixed seat. The middle part of the first linkage is hinged to the middle part of the second linkage. The first linkage, the fourth linkage, and the first adjustment assembly are linked together.

[0018] By adopting the above technical solution: when the window sash opens and closes, it drives the second link and the third link to move synchronously. When the second link moves, it drives the fourth link to rotate circumferentially around its hinge point with the fixed seat. When the third link moves, it drives the first link to rotate circumferentially around its hinge point with the fixed seat. This realizes the movement of the mounting seat relative to the fixed seat. There is no need to open a sliding groove on the fixed seat or mounting seat. This can reduce the length of the hinge, making it suitable for smaller spaces and improving the applicability of the hinge.

[0019] The aforementioned three-dimensional adjustable door and window hinge can be further configured such that: the second link has a first receiving groove, and the third link can be placed in the first receiving groove when it overlaps with the first link.

[0020] By adopting the above technical solution: when the linkage assembly is closed, the mounting base is located above the fixed base, the first link and the second link overlap vertically, and the third link and the first link also overlap vertically. By opening a first receiving groove on the side of the second link near the third link, and the size of the first receiving groove is adapted to the third link, the third link can be placed in the first receiving groove when it overlaps with the first link, thereby reducing the width of the hinge and improving the adaptability of the hinge.

[0021] The aforementioned three-dimensional adjustable door and window hinge can be further configured such that: the mounting base extends outward from the side near the fixed base with a limiting plate, and the third link has a second receiving groove, the limiting plate can be placed in the second receiving groove and abut against the side wall of the third link.

[0022] By adopting the above technical solution: when the mounting base and the fixed base overlap, the limiting plate is located in the second receiving groove and can abut against the side wall of the third connecting rod, which can limit the mounting base and prevent the window sash from moving excessively. At the same time, it can limit the connecting rod assembly and prevent the window sash from shaking and rebounding due to strong winds, thereby improving the sealing and stability of the hinge.

[0023] The beneficial effects of this utility model are as follows: The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a three-dimensional adjustable door and window hinge according to the present invention; Figure 2 This is a schematic diagram of the structure of the fixing base of this utility model; Figure 3 This is a schematic diagram of the disassembled structure of the fixing base of this utility model; Figure 4 This is a schematic diagram of the linkage assembly of this utility model; Figure 5 This is a schematic diagram of the mounting base of this utility model; Figure 6 This is a schematic diagram showing the disassembled structure of the mounting base of this utility model; Label annotations: Fixed seat 1, First slide groove 11, Second slide groove 12, Adjustment groove 13; Linkage assembly 2, first link 21, second link 22, first receiving groove 221, third link 23, fourth link 24, second receiving groove 241; Mounting base 3, adjusting base 31, first adjusting groove 311, second adjusting groove 312, third adjusting groove 313, limiting slide groove 314, adjusting hole 315, adjusting component 32, limiting plate 33; First adjusting component 4, adjusting plate 41, adjusting eccentric bolt 42, adjusting convex plate 43; Second adjusting component 5, first adjusting bolt 51, adjusting support plate 52, adjusting protrusion 53; Third adjusting component 6, adjusting column 61, second adjusting bolt 62; Fixed seat X-axis -X', Fixed seat Y-axis -Y', Fixed seat Z-axis -Z', Mounting seat X-axis -X", Mounting seat Y-axis -Y", Mounting seat Z-axis -Z". Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figures 1 to 6 The three-dimensional adjustable door and window hinge shown includes a fixed base 1, a connecting rod assembly 2, and a mounting base 3. One end of the connecting rod assembly 2 is linked to the fixed base 1, and the other end is linked to the mounting base 3. The fixed base 1 is provided with a first adjustment component 4, which drives the connecting rod assembly 2 to move along the X' direction. The mounting base 3 is provided with an adjustment seat 31, which is linked to an adjustment component 32. The adjustment seat 31 is provided with a second adjustment component 5 for the adjustment component 32 to move along the Y” direction and a third adjustment component 6 for the adjustment component 32 to move along the Z” direction.

[0027] The fixed base 1 has two sets of first sliding grooves 11 along the X' direction and one set of second sliding grooves 12 along the Y' direction. The fixed base 1 has two sets of fixing plates on the side opposite to the connecting rod assembly 2. The fixed base 1 has an adjustment groove 13.

[0028] The linkage assembly 2 includes a first link 21, a second link 22, a third link 23, and a fourth link 24. The middle part of the first link 21 is hinged to the middle part of the second link 22. One end of the first link 21 is slidably engaged with the first slide groove 11, and the other end is hinged to the third link 23. The end of the third link 23 relative to the first link 21 is hinged to the mounting base 3. One end of the second link 22 is hinged to the mounting base 3, and the other end is hinged to the fourth link 24. The end of the fourth link 24 relative to the second link 22 is slidably engaged with the first slide groove 11.

[0029] The second link 22 has a first receiving groove 221, and the third link 23 can be placed in the first receiving groove 221 when it overlaps with the first link 21.

[0030] Mounting base 3 extends outward from the side near fixed base 1 with a limiting plate 33. The third link 23 has a second receiving groove 241. The limiting plate 33 can be placed in the second receiving groove 241 and abut against the side wall of the third link 23.

[0031] The first adjustment assembly 4 includes an adjustment plate 41 and an adjustment eccentric bolt 42. The adjustment plate 41 is located on the side of the fixed seat 1 opposite to the connecting rod assembly 2. The adjustment eccentric bolt 42 passes through the second slide groove 12 and slides in cooperation with the second slide groove 12. The adjustment eccentric bolt 42 is hinged to the adjustment plate 41. The first connecting rod 21 and the fourth connecting rod 24 pass through the first slide groove 11 and are hinged to the adjustment plate 41. The rotation of the adjustment eccentric bolt 42 can drive the adjustment plate 41 to move along the Y' direction (i.e., the axial direction of the second slide groove 12). The adjustment plate 41 simultaneously drives the first connecting rod 21 and the fourth connecting rod 24 to slide synchronously along the X' direction (i.e., the axial direction of the first slide groove 11), thereby adjusting the position of the connecting rod assembly 2 relative to the fixed seat 1. The adjustment plate 41 is provided with an adjustment protrusion 43, which slides in cooperation with the adjustment groove 13.

[0032] The second adjusting assembly 5 includes a first adjusting bolt 51 and an adjusting support plate 52. The adjusting support plate 52 is mounted on the adjusting component 32. The adjusting seat 31 has a first adjusting groove 311, and the adjusting support plate 52 is slidably engaged with the first adjusting groove 311. A second adjusting groove 312 is formed at the bottom of the first adjusting groove 311. The adjusting support plate 52 has an adjusting protrusion 53, which passes through the second adjusting groove 312 and is slidably engaged with it. The first adjusting bolt 51 is threadedly connected to the adjusting protrusion 53. The side wall of the joint seat 31 is connected to the first adjustment groove 311 and has a third adjustment groove 313. The side wall of the third adjustment groove 313 has a limiting slide groove 314 that engages with the first adjustment bolt 51. The head of the first adjustment bolt 51 slides in the limiting slide groove 314, and the end of the bolt abuts against the side wall of the second adjustment groove 312 opposite to the third adjustment groove 313. Rotating the first adjustment bolt 51 can drive the adjustment support plate 52 to slide in the first adjustment groove 311, thereby realizing the position adjustment of the adjustment component 32 along the Y” direction.

[0033] The third adjustment component 6 includes an adjustment column 61 and a second adjustment bolt 62. The adjustment seat 31 has an adjustment hole 315. The adjustment column 61 passes through the adjustment hole 315. The second adjustment bolt 62 passes through the adjustment hole 315 and is threadedly connected to the adjustment hole 315. One end of the adjustment column 61 is fixedly connected to the connecting rod assembly 2, and the other end abuts against the second adjustment bolt 62. The rotation of the second adjustment bolt 62 causes the adjustment seat 31 to move in the Z” direction.

[0034] The working principle of this embodiment is as follows: When the hinge is installed, the fixed seat 1 is connected to the window frame. Rotating the eccentric bolt 42 drives the adjusting plate 41 to move along the second slide groove 12 axially (Y' direction). While the adjusting plate 41 moves, it drives the first connecting rod 21 and the fourth connecting rod 24 to move along the first slide groove 11 axially (X' direction), thus adjusting the position of the mounting seat 3 relative to the fixed seat 1.

[0035] The adjusting support plate 52 of the adjusting member 32 is located in the first adjusting groove 311 of the adjusting seat 31, the adjusting protrusion 53 is located in the second adjusting groove 312, the head of the first adjusting bolt 51 is located in the third adjusting groove 313 and its edge is slidably engaged with the limiting slide groove 314. When the first adjusting bolt 51 is rotated, the adjusting protrusion 53 moves along the axial direction (Y” direction) of the first adjusting bolt 51, thereby adjusting the horizontal position of the adjusting member 32 relative to the adjusting seat 31.

[0036] Then rotate the second adjusting bolt 62 inside the adjusting hole 315. The second adjusting bolt 62 drives the adjusting seat 31 to move along the axial direction (Z” direction) of the adjusting hole 315, adjusting the height of the mounting seat 3 relative to the fixed seat 1.

[0037] After adjustment, fix the fixing seat 1 to the window frame and the mounting seat 3 to the window sash, thus completing the connection between the window sash and the window frame.

[0038] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A three-dimensional adjustable door and window hinge, comprising a fixed base, a connecting rod assembly, and a mounting base, wherein one end of the connecting rod assembly is linked to the fixed base and the other end is linked to the mounting base, characterized in that: The fixed base is provided with a first adjustment component, which drives the connecting rod assembly to move along the X-axis of the fixed base. The mounting base is provided with an adjustment seat, which is linked to an adjustment component. The adjustment seat is provided with a second adjustment component for the adjustment component to move along the Y-axis of the mounting base and a third adjustment component for the adjustment component to move along the Z-axis of the mounting base.

2. The three-dimensional adjustable door and window hinge according to claim 1, characterized in that: The first adjustment assembly includes an adjustment plate and an adjustment eccentric bolt. The adjustment plate is located on the side of the fixed seat opposite to the connecting rod assembly. The fixed seat has several sets of first sliding grooves along the X-axis and a second sliding groove along the Y-axis. The connecting rod assembly slides in conjunction with the first sliding groove and is linked with the adjustment plate. The adjustment eccentric bolt slides in conjunction with the second sliding groove and is hinged to the adjustment plate. The rotation of the adjustment eccentric bolt causes the adjustment plate to move axially along the second sliding groove, which in turn causes the connecting rod assembly to move axially along the first sliding groove.

3. A three-dimensional adjustable door and window hinge according to claim 2, characterized in that: The fixed base is provided with an adjustment groove, and the adjustment plate is provided with an adjustment protrusion. The adjustment protrusion passes through the adjustment groove and slides in cooperation with the adjustment groove.

4. A three-dimensional adjustable door and window hinge according to claim 3, characterized in that: The second adjusting assembly includes a first adjusting bolt and an adjusting support plate. The adjusting support plate is disposed on the adjusting component. The adjusting seat has a first adjusting groove. The adjusting support plate is slidably engaged with the first adjusting groove. A second adjusting groove is formed at the bottom of the first adjusting groove. The adjusting support plate has an adjusting protrusion. The adjusting protrusion passes through the second adjusting groove and is slidably engaged with the second adjusting groove. The first adjusting bolt is threadedly connected to the adjusting protrusion. A third adjusting groove is formed on the side wall of the adjusting seat, which is connected to the first adjusting groove. A limiting slide groove is formed on the side wall of the third adjusting groove, which engages with the first adjusting bolt. The head of the first adjusting bolt is slidably engaged with the limiting slide groove, and the bolt end abuts against the side wall of the second adjusting groove opposite to the third adjusting groove.

5. A three-dimensional adjustable door and window hinge according to claim 4, characterized in that: The third adjustment component includes an adjustment column and a second adjustment bolt. The adjustment seat has an adjustment hole through it. The adjustment column passes through the adjustment hole. The second adjustment bolt passes through the adjustment hole and is threadedly connected to the adjustment hole. One end of the adjustment column is fixedly connected to the connecting rod assembly, and the other end abuts against the second adjustment bolt. The rotation of the second adjustment bolt causes the adjustment seat to move along the Z-axis of the mounting seat.

6. A three-dimensional adjustable door and window hinge according to any one of claims 1 to 5, characterized in that: The linkage assembly includes a first linkage, a second linkage, a third linkage, and a fourth linkage. One end of the first linkage is hinged to a fixed base, and the other end is hinged to the end of the third linkage. One end of the third linkage relative to the first linkage is hinged to a mounting base. One end of the second linkage is hinged to a mounting base, and the other end is hinged to the end of the fourth linkage. One end of the fourth linkage relative to the second linkage is hinged to a fixed base. The middle portions of the first linkage and the second linkage are hinged together. The first linkage, the fourth linkage, and the first adjustment assembly are linked together.

7. A three-dimensional adjustable door and window hinge according to claim 6, characterized in that: The second connecting rod has a first receiving groove, and the third connecting rod can be placed in the first receiving groove when it overlaps with the first connecting rod.

8. A three-dimensional adjustable door and window hinge according to claim 7, characterized in that: The mounting base extends outward from the side near the fixed base with a limiting plate. The third connecting rod has a second receiving groove, and the limiting plate can be placed in the second receiving groove and abut against the side wall of the third connecting rod.