CN203742331U

CN203742331U - Adjustable door hinge with modified adjusting structure

Info

Publication number: CN203742331U
Application number: CN201420150665.6U
Authority: CN
Inventors: 柳奕斌; 马宗献
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-03-31
Filing date: 2014-03-31
Publication date: 2014-07-30
Anticipated expiration: 2024-03-31

Abstract

The utility model relates to an adjustable door hinge with a modified adjusting structure. The adjustable door hinge comprises a pair of base portions and a hinge part opening and closing the pair of base portions. Each base is provided with a pair of positioning parts. One of the bases is provided with displacement adjusting devices capable of adjusting the pair of positioning parts to displace leftwards and rightwards as well as inwards and outwards. Each displacement adjusting device comprises a rack, a gear and a U-shaped part, wherein the racks, the gears and the U-shaped parts are arranged on the positioning parts. The tail end of each U-shaped part is provided with an adjusting threaded hole, screw bolts are arranged in the adjusting thread holes, the top ends of the screw bolts are provided with central holes through which operating tools can drive and rotate the screw bolts, and the screw bolts can be rotationally positioned on the bases. Top arms of the U-shaped openings of the U-shaped parts are provided with through holes. Each displacement adjusting device further comprises support arms arranged on the positioning parts. The support arms are provided with fastening threaded holes corresponding to the through holes and inserted into the U-shaped openings, and fastening screws are screwed into the fastening threaded holes after penetrating the through holes. Due to characteristics and advantages of the adjustable door hinge, the door hinge can be applied to adjustable concealed type door hinge products.

Description

Adjustable door hinge with improved adjusting structure

Technical Field

The present invention relates to a heavy door hinge capable of being buried in a door leaf or a door frame for use, and more particularly, to an adjustable door hinge having an improved adjusting structure, which can be opened and closed at multiple angles.

Background

The applicant filed a chinese patent with application number ZL201320629066.8 on 12/10/2013, which discloses a three-dimensional adjustable door hinge, comprising a pair of left and right accommodating seats capable of being embedded in a door leaf or a door frame, and a set of bow-shaped arm assemblies capable of forming a variable angle, wherein a pair of displacement-adjustable fixing members are respectively arranged in the left and right accommodating seats, and two ends of the bow-shaped arm assembly are respectively connected to the pair of fixing members in the left and right accommodating seats; one of the fixing pieces in the pair of fixing pieces in the left accommodating seat or the right accommodating seat comprises a straight arm sinking into the accommodating seat, and the straight arm is provided with a straight tooth; the accommodating seat is provided with a gear corresponding to the straight teeth, the gear is positioned on the side edge of the straight teeth and meshed with the straight teeth, and the fixing piece can be driven to move when the gear is rotated. The pair of fixed parts in the right accommodating seat further respectively comprises a support arm (42 c, 42 d) connected with the straight arm, and the support arms (42 c, 42 d) are provided with inner and outer adjusting devices; interior outer adjusting device includes a holding screw, sets up the set screw of holding screw side and with set screw threaded connection's screw thread external member, screw thread external member threaded connection in the right side holds on the seat, set screw passes behind the support arm threaded connection to on the screw thread external member, and holding screw threaded connection on the support arm and holding screw top pressure is in hold on the seat on the right side. In the door hinge disclosed in patent document ZL201320629066.8, the support arms (42 c, 42 d) can be adjusted in the X direction, i.e., the inward and outward direction, and also can be adjusted in the Y direction, i.e., the left and right direction. However, both adjustments are concentrated on the same arm 42c or arm 42d, which has the consequence that the Y-direction adjustment requires the entire arm 42c or arm 42d to be moved to the left or right, which in turn affects the determined positioning in the X-direction.

Disclosure of Invention

As an adjustable door hinge, referring to fig. 5, it is generally required to be adjustable in three directions of X-axis, Y-axis and Z-axis. In view of the deficiencies of the prior art, one of the problems solved by the present invention is to improve the structure of the arm and the positioning mechanism associated therewith disclosed in the prior art, so that the positioning position determined by the X axis is not affected when the Y axis is adjusted, and the positioning position determined by the Y axis is not affected when the X axis is adjusted.

To this end, the invention proposes an adjustable door hinge with an improved adjustment structure, having,

the pair of base parts can be respectively arranged on a door frame and a door leaf, each base part comprises a base and an accommodating cavity arranged in the base, each accommodating cavity is internally provided with a pair of positioning parts consisting of a front positioning part and a rear positioning part, the front positioning part and the rear positioning part are arranged in front and back at intervals and are fixedly connected through a connecting arm, and the pair of positioning parts can slide in the accommodating cavity;

the hinge parts are positioned between the base body parts and used for forming multi-angle opening and closing between the base body parts, and end rotating shafts at two ends of the hinge parts are respectively connected between the front positioning part and the rear positioning part in the corresponding base body parts;

the device is characterized in that a first displacement adjusting device capable of adjusting the left-right displacement and the inner-outer displacement of the front positioning piece and a second displacement adjusting device capable of adjusting the left-right displacement and the inner-outer displacement of the rear positioning piece are arranged in one of the bases; wherein,

the first displacement adjusting device comprises a first rack arranged on the front positioning piece and a first gear which is rotatably arranged on the side edge of the first rack and can be meshed with the first rack, and the front positioning piece can be driven to move left and right when the first gear is rotated;

the first displacement adjusting device further comprises a first U-shaped part, a first adjusting threaded hole is formed in the tail end of the first U-shaped part, a first stud is arranged in the first adjusting threaded hole, a central hole capable of driving an operating tool to rotate is formed in the top end of the first stud, and the first stud can be rotationally positioned on the base; the first U-shaped part is provided with a U-shaped opening part, a first through hole is formed in the top end arm body of the U-shaped opening part, and the first through hole is in a long groove shape extending along the left-right direction;

the first displacement adjusting device further comprises a first support arm arranged on the front positioning piece, the first support arm is offset on one side of the front positioning piece, a first fastening threaded hole corresponding to the first through hole is formed in the first support arm, the first support arm is inserted into the U-shaped opening of the first U-shaped piece, and a first fastening screw penetrates through the first through hole and then is screwed in the first fastening threaded hole;

the second displacement adjusting device comprises a second rack arranged on the rear positioning piece and a second gear which is rotatably arranged on the side edge of the second rack and can be meshed with the second rack, and the rear positioning piece can be driven to move left and right when the second gear is rotated;

the second displacement adjusting device further comprises a second U-shaped part, a second adjusting threaded hole is formed in the tail end of the second U-shaped part, a second stud is arranged in the second adjusting threaded hole, a central hole capable of driving an operating tool to rotate is formed in the top end of the second stud, and the second stud can be rotationally positioned on the base; the second U-shaped part is provided with a U-shaped opening part, a second through hole is formed in the top end arm body of the U-shaped opening part, and the second through hole is in a long groove shape extending along the left-right direction;

the second displacement adjusting device further comprises a second support arm arranged on the rear positioning piece, the second support arm is biased to be arranged on one side of the rear positioning piece, a second tightening threaded hole corresponding to the second through hole is formed in the second support arm, the second support arm is inserted into the U-shaped opening of the second U-shaped piece, and a second tightening screw penetrates through the second through hole and then is screwed into the second tightening threaded hole.

In the above-described structure, the first displacement adjusting means and the second displacement adjusting means have substantially the same structure. When the front positioning element is adjusted in the X-axis or Y-axis direction, the rear positioning element generally needs to be correspondingly adjusted. Secondly, the directions of the left-right displacement and the inner-outer displacement defined by the invention can refer to the Y direction and the X direction shown in the figure 5 in the embodiment; the Z-axis direction shown in fig. 4 is the up-down direction.

Because the end part rotating shafts at two ends of the hinge part are respectively connected between the front positioning part and the rear positioning part, the relative position between the bases of the adjustable door hinge can be adjusted when the relative positions of the front positioning part and the rear positioning part are adjusted, namely the relative position between the door leaf and the door frame can be adjusted, such as the distance, the relative parallelism or the goodness of fit between the door leaf and the door frame.

Taking the structure of the first displacement adjusting device as an example, the technical solution of the present invention has the beneficial technical effects compared with the prior art that, because the first displacement adjusting device includes a first U-shaped member, and the first arm is inserted into the U-shaped opening of the first U-shaped member, and the first arm and the first U-shaped member are tightened or released after passing through the first through hole by a first set screw, therefore, before the left-right displacement of the front positioning member in the Y direction needs to be adjusted, the first set screw can be loosened to make the space between the first U-shaped member and the first arm in a loose state; when the first gear is rotated to drive the front positioning piece to move left and right, the front positioning piece and the first supporting arm move left and right, the first supporting arm only moves left and right in a U-shaped space limited by the first U-shaped piece, but the first U-shaped piece is still limited by the first stud at the moment, namely, the first U-shaped piece cannot move left and right and cannot move inside and outside, and therefore, the determined position of the front positioning piece in the inside and outside direction (namely, the X direction) cannot be influenced when the front positioning piece moves left and right by driving the first gear. When the first stud is rotated in reverse, the front positioning piece can be driven to move in the inner direction and the outer direction (namely the X direction), so that the adjustment in the X direction is realized, and the position of the front positioning piece in the Y direction cannot be influenced in the adjustment process. Therefore, the technical scheme of the invention can avoid the influence on the determined position in the other direction when the position in one direction is adjusted.

The further technical scheme can also be that the tail end of the first stud is provided with a section of non-threaded column body, a circle of raised edge is arranged on the non-threaded column body, and the tail end of the first stud is also provided with a first central screw hole; the base is provided with a first concave cavity, the bottom wall of the first concave cavity is provided with a first concave cavity hole, and the aperture of the first concave cavity hole is smaller than the inner diameter of the bottom wall of the first concave cavity; the first connecting screw is screwed in the first central screw hole, and a gap is reserved between the head of the first connecting screw and the bottom wall of the first cavity. The gap enables the first stud to be rotatably positioned on the base.

Further, according to a further technical scheme, a first gasket is further arranged between the head of the first connecting screw and the bottom wall of the first cavity, and a gap is formed between the first gasket and the head of the first connecting screw or between the first gasket and the bottom wall of the first cavity. The first washer enables the first stud to be rotatably positioned relative to the base while maintaining a minimum amount of clearance.

The tail end of the second stud is provided with a section of non-threaded column body, a circle of raised edge is arranged on the non-threaded column body, and the tail end of the second stud is also provided with a second central screw hole; a second concave cavity is formed in the base, a second concave cavity hole is formed in the bottom wall of the second concave cavity, and the aperture of the second concave cavity hole is smaller than the inner diameter of the bottom wall of the second concave cavity; the screw rod part of the second connecting screw is screwed in the second central screw hole, and a gap is reserved between the head part of the second connecting screw and the bottom wall of the second cavity.

In a further technical solution, a second gasket is further disposed between the head of the second connecting screw and the bottom wall of the second cavity, and a gap is formed between the second gasket and the head of the second connecting screw or the bottom wall of the second cavity.

The further technical scheme can also be that the gear box further comprises a cover plate capable of covering the accommodating cavity, and a through hole matched with the upper shaft extending end of the first gear is formed in the cover plate.

The further technical scheme can also be that the upper shaft extending end of the first gear extends into the through hole; the base is provided with a shaft hole matched with the lower shaft extension end of the first gear, and the lower shaft extension end of the first gear is rotatably arranged in the shaft hole.

According to a further technical scheme, the cover plate is also provided with scale marks corresponding to the mark lines arranged on the pair of positioning pieces.

Due to the characteristics and the advantages, the invention can be applied to adjustable hidden door hinge products.

Drawings

Fig. 1 is a schematic perspective view of an adjustable door hinge to which an improved adjusting structure according to an embodiment of the present invention is applied;

FIG. 2 is a front view of the adjustable door hinge of the improved adjustment mechanism of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 2; wherein the relative adjustment structure associated with the pair of positioning members (4, 4a) and the mechanism of the adjustment members thereof shown in fig. 3 are the same. And in order to clearly show the structure of these adjustment members themselves, fig. 3 specifically removes the adjustment members associated with the front positioning member 4 from the base 12. The combination of these removal elements can be referred to the relevant combination of the rear positioning element 4 a. Correspondingly, the specific structure of the adjusting mechanism of the rear positioning member 4a can refer to the adjusting component of the front positioning member 4.

FIG. 5 is a perspective view of the adjustment mechanism of FIG. 1 shown separately removed from the base (11, 12);

FIG. 6 is a schematic perspective view of FIG. 5 in another orientation;

fig. 7 is a schematic perspective view of fig. 5 with parts removed.

Detailed Description

The adjustable door hinge with improved adjusting structure applying the technical scheme of the invention is further explained with the accompanying drawings.

As an adjustable door hinge, referring to fig. 4, it is generally required to be adjustable in three directions of X-axis, Y-axis and Z-axis. The invention and the embodiment mainly disclose how to realize the improved structure of the door hinge 1 in the X-axis and Y-axis directions, so that the determined positioning position of the X-axis direction cannot be influenced when the Y-axis direction is adjusted, and the determined positioning position of the Y-axis direction cannot be influenced when the X-axis direction is adjusted.

As shown in fig. 1, 2 and 3, the adjustable door hinge 1 having an improved adjusting structure has a pair of base portions including a left base portion and a right base portion which can be provided to a door frame and a door leaf, respectively, by screws through connection holes (111, 111a, 121 a) provided thereon.

The left base body comprises a left base 11 and an accommodating cavity 110 arranged in the left base 11, a pair of positioning parts consisting of a front positioning part 112 and a rear positioning part 112a are arranged in the accommodating cavity 110, the front positioning part 112 and the rear positioning part 112a are arranged in front and behind with a certain distance and fixedly connected through a connecting arm 81, and the pair of positioning parts (112, 112a) can slide up and down in the accommodating cavity 110; the front positioning member 112 of the left base 11 is provided with a front adjusting device 113, and the rear positioning member 112a is provided with a rear adjusting device 114, which are mainly used for adjusting the door hinge 1 in the up-down direction (i.e. the Z direction), and the structure of the adjustment is not the focus of the present invention, and therefore, the further description is not provided.

As shown in fig. 1 to 7, the right base portion includes a right base 12 and an accommodating cavity 120 disposed in the right base 12, a pair of positioning members consisting of a front positioning member 4 and a rear positioning member 4a is also disposed in the accommodating cavity 120, the front positioning member 4 and the rear positioning member 4a are arranged in a front-rear direction with a gap and fixedly connected by a connecting arm 82, and the pair of positioning members (4, 4a) can slide left and right, inside and outside in the accommodating cavity 120, so as to adjust the left and right, inside and outside of the door hinge 1.

A set of hinge elements 2 is arranged between the left base 11 and the right base 12, and the set of hinge elements 2 is used for forming multi-angle opening and closing between the pair of base parts. Wherein, a set of the hinge parts 2 comprises a first arc arm 21 and a second arc arm 22, the middle parts of the first arc arm 21 and the second arc arm 22 are hinged together through a middle shaft 23, the left end rotating shaft 25 of the first arc arm 21 is slidingly arranged between the front positioning piece 112 and the rear positioning piece 112a in the left base 11, and the right end rotating shaft 26 is rotatably positioned between the front positioning piece 4 and the rear positioning piece 4a in the right base 12; the left end rotating shaft 24 of the second arcuate arm 22 is rotatably positioned between the front positioning member 112 and the rear positioning member 112a in the left base 11, and the right end rotating shaft 27 is slidably disposed between the front positioning member 4 and the rear positioning member 4a in the right base 12. The structure of the set of articulations 2 can also take many other solutions according to the information disclosed in the prior art.

In order to realize the adjustment of X, Y in two directions, a first displacement adjusting device capable of adjusting the left-right displacement and the inner-outer displacement of the front positioning piece 4 and a second displacement adjusting device capable of adjusting the left-right displacement and the inner-outer displacement of the rear positioning piece 4a are arranged in the right base 12. The structures of the first displacement adjustment device and the second displacement adjustment device are described in detail below.

As shown in fig. 1 to 7, the first displacement adjusting device includes a first rack 84 disposed on an outer side surface of the front positioning element 4, and a first gear 83 rotatably disposed on a side of the first rack 84 and capable of meshing with the first rack 84, and when the first gear 83 is rotated, the front positioning element 4 can be driven to move left and right. The first displacement adjusting device further comprises a first U-shaped part 6, a first adjusting threaded hole 65 is formed in the tail end of the first U-shaped part 6, a first stud 5 is arranged in the first adjusting threaded hole 65, a center hole 55 capable of driving an operating tool to rotate is formed in the top end of the first stud 5, and the center hole 55 can be in a shape of an inner hexagon and the like; the first stud 5 is rotatably positioned on the base 12; the first U-shaped member 6 has a U-shaped opening 63, the U-shaped opening 63 is formed by combining a bottom end arm 61 and a top end arm 62, wherein a first through hole 64 is formed in the top end arm 62 of the U-shaped opening 63, and the first through hole 64 is in the shape of a long groove extending in the left-right direction.

Secondly, in order to rotatably position the first stud 5 on the base 12, the adopted structure is as shown in fig. 4, the first stud 5 comprises a section of stud 51 and a section of non-threaded cylinder 52, a circle of convex edge 54 is arranged on the non-threaded cylinder 52, and a first central screw hole 53 is further arranged at the tail end of the first stud 5; a first concave cavity 122 is arranged on the base 12, a first concave cavity hole 123 is arranged on the bottom wall of the first concave cavity 122, the aperture of the first concave cavity hole 123 is smaller than the inner diameter of the bottom wall of the first concave cavity 122 so as to be step-shaped, and the aperture of the first concave cavity hole 123 is smaller than the outer diameter of the convex edge 54; the screw rod part of the first connecting screw 31 passes through the first gasket 32 and then is screwed in the first central screw hole 53; the protruding edge 54 provided on the non-threaded cylinder 52 of the first stud 5 is sunk into the ring of concave holes 66 provided on the end face of the first adjustment threaded hole 65, and the non-threaded cylinder 52 is inserted into the first concave hole 123, so that the first concave hole 123 can form a radial positioning for the non-threaded cylinder 52, and the bottom wall of the first concave hole 123 can also form an axial positioning for the non-threaded cylinder 52 by means of the protruding edge 54. The whole first stud 5 and the first U-shaped part 6 are connected through screw threads and then abut against the inner side of the base body 12. After the first connection screw 31 is installed, the outer side of the head of the first connection screw 31 is not higher than the outer side of the base 12, and a gap is formed between the inner side of the head of the first connection screw 31 and the bottom wall of the first pad 32 or the first cavity 122. In this way, the first stud 5 can be rotationally positioned on the base 12.

The first displacement adjusting device further comprises a first support arm 41 arranged on the front positioning part 4, the first support arm 41 and the front positioning part 4 are integrally formed into a whole, and the first support arm 41 is offset on the right side of the front positioning part 4. The first supporting arm 41 is provided with a first fastening threaded hole 42 corresponding to the first through hole 64, the first supporting arm 41 is inserted into the U-shaped opening 63 of the first U-shaped member 6, and the first fastening screw 7 is screwed into the first fastening threaded hole 42 after passing through the first through hole 64.

According to the above-described structure, the right and left and the inner and outer adjustment method is as follows,

before the left and right displacement of the front positioning piece 4 needs to be adjusted, the first set screw 7 is firstly loosened to enable the space between the first U-shaped piece 6 and the first supporting arm 41 to be in a loose state, then the first gear drive 83 is rotated to enable the front positioning piece 4 to move left and right, the first set screw 7 can slide in the first through hole 64 in the shape of a long groove along the left and right direction, and the first set screw 7 is tightened after the adjustment is finished. At this time, the first U-shaped part 6 is still limited by the first stud 5 and does not move, so that the positioning in the inner and outer directions is not influenced.

When the internal and external displacement of the front positioning part 4 needs to be adjusted, the first stud 5 is directly rotated to enable the first U-shaped part 6 to move inside and outside, and at the moment, the first U-shaped part 6 drives the first support arm 41 to move in the internal and external directions so as to enable the front positioning part 4 to move in the internal and external directions. Since the rack structure is provided on the front positioning member 4, the first gear drive 83 does not hinder the movement of the front positioning member 4 in the inward and outward directions.

Therefore, when the front positioning member 4 is moved left and right by driving the first gear 83, the determined position of the front positioning member 4 in the inward and outward direction (i.e., X direction) is not affected. When the first stud 5 is rotated in the opposite direction, the front positioning piece 4 can be driven to move in the inner and outer directions (namely the X direction), so that the adjustment in the X direction is realized, and the position of the front positioning piece 4 in the Y direction cannot be influenced in the adjustment process. Therefore, the technical scheme of the invention can avoid the influence on the determined position in the other direction when the position in one direction is adjusted.

In the adjustment of the first displacement adjustment device, the second displacement adjustment device is preferably also adapted. The second displacement adjustment means is of substantially the same construction as the first displacement adjustment means. For this reason, the structure of the second displacement adjustment means will be described only briefly with respect to the structures already indicated in the drawings.

As shown in fig. 1 to 7, the second displacement adjusting device includes a second rack 84a disposed on an outer side surface of the rear positioning element 4a, and a second gear 83a rotatably disposed on a side of the second rack 84a and capable of meshing with the second rack 84a, and when the second gear 83a is rotated, the rear positioning element 4a can be driven to move left and right. The second displacement adjusting device also comprises a second U-shaped part 6a, and a second stud 5a is arranged in the second U-shaped part 6 a; the second stud 5a is rotatably positioned on the base 12; the second U-shaped member 6a has a U-shaped opening portion, a second through hole 64a is provided in the tip end arm body 62a of the U-shaped opening portion, and the second through hole 64a has a long groove shape extending in the left-right direction.

Next, in order to rotatably position the second stud 5a on the base 12, as shown in fig. 4, a structure is adopted, in which a second cavity 122a is provided on the base 12, and the structure further includes a second connection screw 31a and a second washer 32a, and a screw rod portion of the second connection screw 31a is screwed in the non-threaded cylinder 52a of the second stud 5a after passing through the second washer 32 a. The whole second stud 5a is screwed with the second U-shaped part 6a and then abuts against the inner side of the base body 12. After the second connection screw 31a is installed, the outer side of the head of the second connection screw 31a is not higher than the outer side of the base 12, and a gap is further formed between the inner side of the head of the second connection screw 31a and the bottom wall of the second gasket 32a or the second cavity 122 a. In this way, the second stud 5a can be rotationally positioned on the base 12.

The second displacement adjusting device further comprises a second support arm 41a arranged on the rear positioning element 4a, the second support arm 41a and the rear positioning element 4a are integrally formed, and the second support arm 41a is offset on the right side of the rear positioning element 4 a. The second support arm 41a is provided with a second fastening threaded hole 42a corresponding to the second through hole 64a, the second support arm 41 is inserted into the U-shaped opening of the second U-shaped element 6, and the second fastening screw 7a is screwed into the second fastening threaded hole after passing through the second through hole 64 a.

A further technical solution may also be that, as shown in fig. 1, fig. 2 and fig. 3, the gear box further includes a cover plate 124 capable of covering the accommodating cavity 120, and a through hole 125 adapted to the upper shaft extension end of the first gear 83 is provided on the cover plate 124. The upper shaft extension end of the first gear 83 extends into the through hole 125; a shaft hole adapted to the lower shaft extension end of the first gear 83 is provided in the base 12, and the lower shaft extension end of the first gear 83 is rotatably disposed in the shaft hole, so that the first gear 83 can be rotatably disposed in the base 12. Correspondingly, a through hole 125a adapted to the upper shaft extension end of the second gear 83a is further provided on the cover plate 124. The upper shaft-extending end of the second gear 83a extends into the through hole 125 a; a shaft hole adapted to the lower shaft extension end of the second gear 83a is provided in the base 12, and the lower shaft extension end of the second gear 83a is rotatably provided in the shaft hole, so that the second gear 83a can be rotatably provided in the base 12.

Further, according to a further technical solution, the cover plate 124 is further provided with scale marks 126 corresponding to the mark lines provided on the pair of positioning members. Thus, when the first gear 83 or the second gear 83a is adjusted, the adjustment amount is displayed correspondingly.

Claims

1. An adjustable door hinge having an improved adjustment structure, comprising:

the second displacement adjusting device further comprises a second U-shaped part, a second adjusting threaded hole is formed in the tail end of the second U-shaped part, a second stud is arranged in the second adjusting threaded hole, a central hole capable of enabling an operating tool to drive to rotate is formed in the top end of the second stud, and the second stud can be rotationally positioned on the base; the second U-shaped part is provided with a U-shaped opening part, a second through hole is formed in the top end arm body of the U-shaped opening part, and the second through hole is in a long groove shape extending along the left-right direction;

2. The adjustable door hinge according to claim 1, wherein the tail end of the first stud has a section of non-threaded post provided with a raised edge, and the tail end of the first stud is further provided with a first central screw hole; the base is provided with a first concave cavity, the bottom wall of the first concave cavity is provided with a first concave cavity hole, and the aperture of the first concave cavity hole is smaller than the inner diameter of the bottom wall of the first concave cavity; the first connecting screw is screwed in the first central screw hole, and a gap is reserved between the head of the first connecting screw and the bottom wall of the first cavity.

3. The adjustable door hinge according to claim 2, wherein a first shim is further disposed between the head of the first connection screw and the first cavity bottom wall, and a gap is provided between the first shim and the head of the first connection screw or the first cavity bottom wall.

4. The adjustable door hinge according to claim 1, wherein the tail end of the second stud has a section of non-threaded post provided with a raised edge, and a second central screw hole; a second concave cavity is formed in the base, a second concave cavity hole is formed in the bottom wall of the second concave cavity, and the aperture of the second concave cavity hole is smaller than the inner diameter of the bottom wall of the second concave cavity; the screw rod part of the second connecting screw penetrates through the second cavity hole and is screwed in the second central screw hole, and a gap is reserved between the head part of the second connecting screw and the bottom wall of the second cavity.

5. The adjustable door hinge according to claim 4, wherein a second shim is further disposed between the head of the second connecting screw and the second cavity bottom wall, and a gap is provided between the second shim and the head of the second connecting screw or the second cavity bottom wall.

6. An adjustable door hinge according to any one of claims 1 to 5, further comprising a cover plate capable of covering the receiving cavity, wherein the cover plate is provided with a through hole adapted to the upper shaft extension end of the first gear.

7. An adjustable door hinge according to claim 6, wherein the upper shaft-extending end of the first gear extends into the through-hole; the base is provided with a shaft hole matched with the lower shaft extension end of the first gear, and the lower shaft extension end of the first gear is rotatably arranged in the shaft hole.

8. The adjustable door hinge according to claim 6, wherein the cover plate is further provided with graduation marks corresponding to the marking lines provided on the pair of positioning members.