Damping hinge

Abstract

The utility model discloses a damping hinge, which belongs to the field of hinges, and is characterized in that two ends of a first connecting piece are respectively and rotatably connected with a door support and a fourth connecting piece, two ends of a second connecting piece are respectively and rotatably connected with the door support and the fourth connecting piece, and two ends of a third connecting piece are respectively and rotatably connected with a cabinet support and the second connecting piece; the damping hinge further comprises a buffering assembly, the buffering assembly comprises a fifth connecting piece and a damper, the damper comprises a shell and a push rod installed on the shell, the two ends of the fifth connecting piece are rotationally connected with the first connecting piece and the shell respectively, and the tail end of the push rod is rotationally connected with the fourth connecting piece. Through the design, the fifth connecting piece and the damper form a double-connecting-rod structure, so that the stress direction of the damping push rod is the same as the extension direction of the push rod, the acting force efficiency of the push rod is high, and the damping force of the damper needed by the hinge is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to hinge especially the damping hinge. BACKGROUND

[0002] Generally, in order to ensure the heat insulation performance of the refrigerator, the door body is thick, which requires the hinge connecting the door body and the refrigerator cabinet to have a large opening to avoid the interference between the door body and the refrigerator cabinet during opening / closing, especially with the current gradual popularization of the embedded integrated refrigerator, the door body of the refrigerator also needs to be assembled to the cabinet door plate, which further thickens the thickness of the entire door body, which inevitably requires the hinge to have a larger opening. In addition, the existing hinge usually has a buffering function to prevent hand clamping when the door is automatically closed by damping.

[0003] However, the force direction of the damping push rod is different from the extension direction of the push rod during use of the existing damping hinge, which results in a large damping force required by the hinge. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the utility model is to provide a damping hinge, in which the force direction of the damping push rod is the same as the extension direction of the push rod, and the damping force is small.

[0005] One of the purposes of the utility model is achieved by the following technical solutions:

[0006] A damping hinge, comprising a door support, a cabinet support, a first connecting piece, a second connecting piece, a third connecting piece, and a fourth connecting piece, both ends of the first connecting piece are rotatably connected with the door support and the fourth connecting piece, both ends of the second connecting piece are rotatably connected with the door support and the fourth connecting piece, both ends of the third connecting piece are rotatably connected with the cabinet support and the second connecting piece, the cabinet support is rotatably connected with the fourth connecting piece, the damping hinge further comprises a buffer assembly, the buffer assembly comprises a fifth connecting piece and a damper, the damper comprises a shell and a push rod installed on the shell, both ends of the fifth connecting piece are rotatably connected with the first connecting piece and the shell, and the end of the push rod is rotatably connected with the fourth connecting piece.

[0007] Further, the first connecting piece comprises a guide column, and during rotation of the damping hinge from the critical state to the closed state, the fifth connecting piece is in contact with the guide column.

[0008] Further, the first connecting piece comprises a first connecting wall and two first plates, the two first plates are parallel to each other, the first connecting wall connects the two first plates, the guide column is located on the first plate, and the buffer assembly is located between the two first plates.

[0009] Further, the fifth connecting piece comprises a fourth connecting wall and two fourth plate bodies, the two fourth plate bodies are parallel to each other, the fourth connecting wall connects the two fourth plate bodies, and the shell part is located between the two fourth plate bodies and is rotationally connected with the two fourth plate bodies.

[0010] Further, when the damping hinge is in the critical state and the closed state, the included angle between the fifth connecting piece and the damper is an acute angle.

[0011] Further, when the damping hinge is in the open state, the included angle between the fifth connecting piece and the damper is an obtuse angle.

[0012] Further, the fourth connecting piece is provided with an eleventh hinge hole, a twelfth hinge hole and a fourteenth hinge hole, the eleventh hinge hole and the twelfth hinge hole are respectively located at two ends of the fourth connecting piece, the fourteenth hinge hole is located between the eleventh hinge hole and the twelfth hinge hole, the cabinet support is rotationally connected with the fourth connecting piece through the eleventh hinge hole, the first connecting piece is rotationally connected with the fourth connecting piece through the twelfth hinge hole, and the second connecting piece is rotationally connected with the fourth connecting piece through the fourteenth hinge hole.

[0013] Further, the fourth connecting piece is further provided with a thirteenth hinge hole, the thirteenth hinge hole is located between the twelfth hinge hole and the fourteenth hinge hole, and the push rod is rotationally connected with the fourth connecting piece through the thirteenth hinge hole.

[0014] Further, the second connecting piece comprises a driving part, the driving part is located at one end of the second connecting piece close to the fourth connecting piece, the damping hinge further comprises a self-closing assembly, one end of the self-closing assembly is rotationally installed on the fourth connecting piece, and the other end of the self-closing assembly is slidingly installed on the fourth connecting piece, when the damping hinge rotates from the open state to the critical state, the driving part abuts against the self-closing assembly to drive the self-closing assembly to rotate relative to the fourth connecting piece, and when the damping hinge rotates from the critical state to the closed state, the self-closing assembly moves along the fourth connecting piece under the action of elastic force to make the damping hinge self-close.

[0015] Further, the driving part comprises an abutting surface, a protrusion and a groove, the abutting surface is arc-shaped, the protrusion is located between the abutting surface and the groove, when the damping hinge rotates from the open state to the critical state, the self-closing assembly abuts against the abutting surface, when the damping hinge is in the critical state, the self-closing assembly abuts against the protrusion, and when the damping hinge rotates from the critical state to the closed state, the self-closing assembly passes over the protrusion and falls into the groove.

[0016] Further, the self-closing assembly comprises a main body, a trigger and an elastic piece, the main body is rotationally connected with the fourth connecting piece, the trigger is slidingly connected with the fourth connecting piece, the main body is inserted with the trigger, and the elastic piece is in abutment with the main body and the trigger respectively at two ends.

[0017] Further, the self-closing assembly further comprises a rolling piece and a first rotating shaft, the rolling piece is installed on the first rotating shaft, the first rotating shaft is slidingly installed on the fourth connecting piece, an end of the trigger away from the main body is provided with a mounting portion, and the trigger is clamped with the first rotating shaft under the elastic force of the elastic piece.

[0018] Compared with the prior art, the damping hinge buffer assembly comprises a fifth connecting piece and a damper, the damper comprises a shell and a push rod installed on the shell, two ends of the fifth connecting piece are rotationally connected with the first connecting piece and the shell respectively, and the push rod is rotationally connected with the fourth connecting piece at the tail end, through the above design, the fifth connecting piece and the damper form a double-link structure, so that the stress direction of the damping push rod is the same as the extension direction of the push rod, the acting force efficiency of the push rod is high, and the damping force of the damper required by the hinge is small. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective view of the damping hinge in a critical state of the utility model;

[0020] Figure 2 It is an exploded view of the damping hinge in a critical state of the utility model; Figure 1

[0021] Figure 3 It is a perspective view of the first connecting piece of the damping hinge of the utility model; Figure 1

[0022] It is a perspective view of the second connecting piece of the damping hinge of the utility model; Figure 4 Figure 1 It is a perspective view of the third connecting piece of the damping hinge of the utility model;

[0023] Figure 5 Figure 1 It is a perspective view of the fourth connecting piece of the damping hinge of the utility model;

[0024] Figure 6 It is a perspective view of the self-closing assembly of the self-closing function of the utility model; Figure 1

[0025] It is a perspective view of the buffer assembly of the self-closing function of the utility model; Figure 7 Figure 1 It is a perspective view of the self-closing assembly of the self-closing function of the utility model;

[0026] Figure 8 It is a perspective view of the buffer assembly of the self-closing function of the utility model; Figure 1

[0027] ​​​​​Figure 9 for Figure 1 A three-dimensional sectional view of a damping hinge;

[0028] Figure 10 for Figure 1 A three-dimensional view of the internal structure of a damping hinge;

[0029] Figure 11 This is a perspective view of the damping hinge of this utility model in a closed state;

[0030] Figure 12 for Figure 11 A three-dimensional sectional view of a damping hinge;

[0031] Figure 13 This is a perspective view of the damping hinge of this utility model in the open state;

[0032] Figure 14 for Figure 13 A three-dimensional sectional view of a damping hinge.

[0033] In the diagram: 10. Door support; 11. Base plate; 110. First fixing hole; 12. First side plate; 120. First hinge hole; 121. Second hinge hole; 20. Cabinet support; 21. Top plate; 210. Second fixing hole; 22. Second side plate; 220. Third hinge hole; 221. End hinge hole; 30. First connector; 31. First connecting wall; 32. First plate; 320. Fourth hinge hole; 3 21. Fifth hinge hole; 322. Mounting hole; 33. Guide post; 40. Second connector; 41. Second connecting wall; 42. Second plate; 420. Sixth hinge hole; 421. Seventh hinge hole; 422. Eighth hinge hole; 43. Drive unit; 430. Contact surface; 431. Protrusion; 432. Groove; 50. Third connector; 510. Ninth hinge hole; 511. Tenth hinge hole; 60. Fourth Connector; 61. Third connecting wall; 62. Third plate; 620. Eleventh hinge hole; 621. Twelfth hinge hole; 622. Thirteenth hinge hole; 623. Fourteenth hinge hole; 624. Slide groove; 70. Self-closing assembly; 71. Main body; 72. Trigger; 720. Mounting part; 721. Mounting space; 73. Elastic element; 74. Rolling element; 75. First rotating shaft; 76. Second rotating shaft; 8 0. Buffer assembly; 81. Fifth connector; 810. Fourth connecting wall; 811. Fourth plate; 8110. First rotating hole; 8111. Second rotating hole; 82. Damper; 820. Housing; 821. Push rod; 8210. Third rotating hole; 91. First pivot shaft; 92. Second pivot shaft; 93. Third pivot shaft; 94. Fourth pivot shaft; 95. Fifth pivot shaft; 96. Sixth pivot shaft. Detailed Implementation

[0034] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0035] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or can be fixed thereto via another intermediate component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or can be connected thereto via another intermediate component. When a component is referred to as being "disposed" on another component, it can be directly disposed on the other component or can be disposed thereon via another intermediate component. The terms "vertical", "horizontal", "left", "right", and the like used herein are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments of the present application, and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0037] As shown in Figure 1 and Figure 2 The damping hinge comprises a door support 10, a cabinet support 20, a first connecting piece 30, a second connecting piece 40, a third connecting piece 50, a fourth connecting piece 60, a self-closing assembly 70, a buffer assembly 80, and a pivot shaft.

[0038] The door support 10 is used for fixing a door body. In the present embodiment, the damping hinge is applied to a refrigerator, and the door support 10 is fixed to a refrigerator door. Specifically, the door support 10 comprises a bottom plate 11 and two first side plates 12. The two first side plates 12 are parallel to each other, and the bottom plate 11 connects the two first side plates 12. The bottom plate 11 is provided with a first fixing hole 110 for fixing with the refrigerator door. Each first side plate 12 is provided with a first hinge hole 120 for rotationally connecting with the second connecting piece 40 and a second hinge hole 121 for rotationally connecting with the first connecting piece 30.

[0039] The cabinet support 20 is used to be fixed with the cabinet body. In the embodiment, the damping hinge is applied to the refrigerator, and the cabinet support 20 is fixed to the refrigerator cabinet. The cabinet support 20 is provided with a receiving groove for receiving the first connecting piece 30, the second connecting piece 40, the third connecting piece 50, the fourth connecting piece 60, the self-closing assembly 70 and the buffer assembly 80 when the hinge is closed. Specifically, the cabinet support 20 includes a top plate 21 and two second side plates 22, the two second side plates 22 are parallel to each other, and the top plate 21 is connected to the two second side plates 22. The receiving groove is formed between the two second side plates 22 and the top plate 21. The top plate 21 is provided with a second fixing hole 210 for fixing with the cabinet body. The second side plate 22 is provided with a third hinge hole 220 and an end hinge hole 221, and the third hinge hole 220 and the end hinge hole 221 are located at the same end of the second side plate 22. The cabinet support 20 is rotatably connected to the fourth connecting piece 60 through the third hinge hole 220, and the cabinet support 20 is rotatably connected to the third connecting piece 50 through the end hinge hole 221.

[0040] Please continue to refer to Figure 3 The first connecting piece 30 is designed in a double-plate type, and the cross section is U-shaped, which can increase the structural strength, and the interior of the first connecting piece 30 can receive other components, thereby reducing the size of the hinge and protecting other components. The first connecting piece 30 includes a first connecting wall 31, two first plate bodies 32 and two guide columns 33. The two first plate bodies 32 extend from the two sides of the first connecting wall 31, and the two first plate bodies 32 are parallel to each other and perpendicular to the first connecting wall 31. The two first plate bodies 32 and the first connecting wall 31 form a receiving space for receiving the buffer assembly 80. Each guide column 33 is arranged on the inner wall of a first plate body 32, and the guide column 33 is perpendicular to the first plate body 32. The guide column 33 is used to guide the rotation position of the fifth connecting piece 81, so that the push rod 821 is stressed in the extension and retraction direction, thereby improving the use efficiency of the damper 82.

[0041] Each first plate body 32 is provided with a fourth hinge hole 320, a fifth hinge hole 321 and a mounting hole 322, and the fourth hinge hole 320 and the fifth hinge hole 321 are respectively located at the two end portions of the first plate body 32. The mounting hole 322 is located between the fourth hinge hole 320 and the fifth hinge hole 321. The first connecting piece 30 is rotatably connected to the door support 10 through the fourth hinge hole 320, and the first connecting piece 30 is rotatably connected to the fourth connecting piece 60 through the fifth hinge hole 321. The mounting hole 322 is used to mount the fifth connecting piece 81, so that the fifth connecting piece 81 is rotatably connected to the first plate body 32.

[0042] Please continue to refer to Figure 4, the second connecting piece 40 is double-plate type design, the section is U-shaped, while increasing the structural strength, the inside of the second connecting piece 40 can accommodate other components, reduce the size of the hinge and protect other components. Specifically, the second connecting piece 40 includes a second connecting wall 41, two second plate bodies 42 and a driving part 43. The second connecting wall 41 is located between the two second plate bodies 42 and connects the two second plate bodies 42. The two second plate bodies 42 are parallel to each other, and a receiving space is formed between the two second plate bodies 42. The receiving space is used to accommodate other components. The driving part 43 is located at the end of the second connecting wall 41 and protrudes from the two second plate bodies 42, and the driving part 43 is used to drive the self-closing assembly 70 to rotate. Specifically, the driving part 43 includes an abutting surface 430, a protrusion 431 and a groove 432, the abutting surface 430 is arc-shaped, which is a cam structure, the protrusion 431 is located between the abutting surface 430 and the groove 432. When the damping hinge rotates from the open state to the critical state, the self-closing assembly 70 abuts against the abutting surface 430, when the damping hinge is in the critical state, the self-closing assembly 70 abuts against the protrusion 431, and when the damping hinge rotates from the critical state to the closed state, the self-closing assembly 70 passes over the protrusion 431 and falls into the groove 432.

[0043] The second plate body 42 is provided with a sixth hinge hole 420, a seventh hinge hole 421 and an eighth hinge hole 422. The sixth hinge hole 420 and the seventh hinge hole 421 are respectively located at opposite ends of the second plate body 42, and the eighth hinge hole 422 is located between the sixth hinge hole 420 and the seventh hinge hole 421. The second plate body 42 is rotatably connected with the door support 10 through the sixth hinge hole 420, the second plate body 42 is rotatably connected with the fourth connecting piece 60 through the seventh hinge hole 421, and the second plate body 42 is rotatably connected with the end of the third connecting piece 50 through the eighth hinge hole 422.

[0044] Please continue to refer to Figure 5 The third connecting piece 50 is linear type design, the third connecting piece 50 is provided with a ninth hinge hole 510 and a tenth hinge hole 511, the ninth hinge hole 510 and the tenth hinge hole 511 are respectively located at two sides of the third connecting piece 50, the third connecting piece 50 is rotatably connected with the cabinet support 20 through the ninth hinge hole 510, and the third connecting piece 50 is rotatably connected with the second connecting piece 40 through the tenth hinge hole 511.

[0045] Please continue to refer to Figure 6 The fourth connecting piece 60 is double-plate type design, while increasing the structural strength, the inside of the fourth connecting piece 60 can accommodate other components, reduce the size of the damping hinge and protect other components. The fourth connecting piece 60 includes a third connecting wall 61 and two third plate bodies 62, and the third connecting wall 61 connects the two third plate bodies 62. The two third plate bodies 62 are parallel to each other, and a receiving space is formed between the two third plate bodies 62.

[0046] Each third plate body 62 is provided with an eleventh hinge hole 620, a twelfth hinge hole 621, a thirteenth hinge hole 622, a fourteenth hinge hole 623 and a sliding groove 624. The eleventh hinge hole 620 and the twelfth hinge hole 621 are respectively located at two ends of the third plate body 62. The thirteenth hinge hole 622 is located between the eleventh hinge hole 620 and the twelfth hinge hole 621, the fourteenth hinge hole 623 is located between the thirteenth hinge hole 622 and the eleventh hinge hole 620, and the sliding groove 624 is located between the fourteenth hinge hole 623 and the eleventh hinge hole 620. The fourth connecting piece 60 is rotationally connected with the cabinet support 20 through the eleventh hinge hole 620, and the fourth connecting piece 60 is rotationally connected with the first connecting piece 30 through the twelfth hinge hole 621. The fourth connecting piece 60 is rotationally connected with the push rod 821 of the buffer assembly 80 through the thirteenth hinge hole 622. The fourth connecting piece 60 is rotationally connected with the second connecting piece 40 through the fourteenth hinge hole 623. The fourth connecting piece 60 is slidingly connected with the first rotating shaft 75 of the self-closing assembly 70 through the sliding groove 624. The sliding groove 624 is linear, the sliding groove 624 is used for mounting the first rotating shaft 75, and the limit position of the first rotating shaft 75 is limited, so that the limit angle of rotation of the trigger 72 around the first rotating shaft 75 is limited.

[0047] Please continue to refer to Figure 7 The self-closing assembly 70 comprises a main body 71, a trigger 72, an elastic piece 73, a rolling piece 74, a first rotating shaft 75 and a second rotating shaft 76. The main body 71 is rotationally connected with the eleventh hinge hole 620 through the second rotating shaft 76, so that the end of the main body 71 is rotationally mounted on the fourth connecting piece 60. The main body 71 is coaxially arranged with the trigger 72, and the main body 71 is partially inserted into the trigger 72. Since the trigger 72 always abuts against the driving portion 43, the main body 71 and the trigger 72 will not be separated. The elastic piece 73 is sleeved on the trigger 72, and the two ends of the elastic piece 73 abut against the main body 71 and the trigger 72 respectively, so as to provide the abutting force of the trigger 72 against the driving portion 43.

[0048] The end of the trigger 72 away from the main body 71 is provided with a mounting portion 720, the number of the mounting portion 720 is two, the two mounting portions 720 are parallel and spaced apart, an installation space 721 is formed between the two mounting portions 720, and the rolling piece 74 is located in the installation space 721. Each mounting portion 720 is provided with a mounting groove, the mounting groove is U-shaped, the first rotating shaft 75 is mounted in the two mounting grooves, and the rolling piece 74 is mounted on the first rotating shaft 75.

[0049] Please continue to refer to Figure 8The buffer assembly 80 comprises a fifth connecting member 81 and a damper 82. The fifth connecting member 81 is mounted on the first connecting member 30. The damper 82 is rotatably connected to the fifth connecting member 81 at one end and rotatably connected to the fourth connecting member 60 at the other end. The buffer assembly 80 forms a double connecting rod structure so as to adjust the position and angle of the push rod 821 and make the force received by the push rod 821 the same as the extension direction of the push rod 821.

[0050] Specifically, the fifth connecting member 81 comprises a fourth connecting wall 810 and two fourth plate bodies 811. The two fourth plate bodies 811 are parallel to each other. The fourth connecting wall 810 connects the two fourth plate bodies 811 and is perpendicular to the fourth plate bodies 811. The fourth connecting wall 810 and the two fourth plate bodies 811 form a receiving groove for mounting the damper 82 and enabling the damper 82 to rotate. Each fourth plate body 811 is provided with a first rotation hole 8110 and a second rotation hole 8111. The fourth plate body 811 is rotatably connected to the mounting hole 322 of the first connecting member 30 through the first rotation hole 8110. The fourth plate body 811 is rotatably connected to the housing 820 of the damper 82 through the second rotation hole 8111.

[0051] The damper 82 comprises a housing 820 and a push rod 821. The push rod 821 is mounted on the housing 820 and can extend and retract along the axis direction relative to the housing 820. The push rod 821 is provided with a third rotation hole 8210 at the end away from the housing 820. The push rod 821 is rotatably connected to the thirteenth hinge hole 622 of the fourth connecting member 60 through the third rotation hole 8210.

[0052] Please continue to refer to Figure 2 The pivot shafts comprise a first pivot shaft 91, a second pivot shaft 92, a third pivot shaft 93, a fourth pivot shaft 94, a fifth pivot shaft 95, and a sixth pivot shaft 96.

[0053] The first pivot shaft 91 is mounted on the second hinge hole 121 and the fourth hinge hole 320 to rotatably connect the door support 10 and the first connecting member 30. The second pivot shaft 92 is mounted on the fifth hinge hole 321 and the twelfth hinge hole 621 to rotatably connect the first connecting member 30 and the fourth connecting member 60. The third pivot shaft 93 is mounted on the sixth hinge hole 420 and the first hinge hole 120 to rotatably connect the door support 10 and the second connecting member 40. The fourth pivot shaft 943 is mounted on the seventh hinge hole 421 and the fourteenth hinge hole 623 to rotatably connect the second connecting member 40 and the fourth connecting member 60. The fifth pivot shaft 95 is mounted on the end hinge hole 221 and the ninth hinge hole 510 to rotatably connect the cabinet support 20 and the third connecting member 50. The sixth pivot shaft 96 is mounted on the eighth hinge hole 422 and the tenth hinge hole 511 to rotatably connect the second connecting member 40 and the third connecting member 50.

[0054] When the damping hinge is used, the door support 10 is fixedly connected with the door body, and the cabinet support 20 is fixedly connected with the cabinet body. When the hinge is in the fully open state, as shown in FIG. 8, the included angle between the door support 10 and the cabinet support 20 is obtuse, which meets the requirement of large opening angle of the hinge. At this time, the rolling part 74 is in abutment with the abutment surface 430, the elastic part 73 is in the compressed state, and the included angle between the fifth connecting part 81 and the damper 82 is obtuse. Figures 11-12

[0055] When the door needs to be closed, an external force is applied to the door body, the door body starts to close, the hinge changes from the open state to the critical state, the abutment surface 430 of the second connecting part 40 abuts against the rolling part 74, so that the self-closing assembly 70 rotates around the second rotating shaft 76, and when the door body is closed to the critical state, as shown in FIG. 9, at this time the protrusion 431 abuts against the rolling part 74, at this time the guide column 33 abuts against the fifth connecting part 81, when the door body is further closed, the rolling part 74 falls into the groove 432, and the elastic force of the elastic part 73 makes the hinge move to the closed state, until the hinge is closed, as shown in FIG. 10. Figure 1 Figure 8 Figure 9 Figure 10

[0056] In the closing process of the hinge, the damper 82 of the buffer assembly 80 abuts against the third connecting part 50, the fifth connecting part 81 and the damper 82 form a double-link structure, so that the force direction of the push rod 821 is the same as the extension direction of the push rod 821, the force efficiency of the push rod 821 is high, and the damping force required by the damper 82 used by the hinge is small. The buffer assembly 80 reduces the speed of the hinge when it is self-closed, so as to prevent the user from being pinched. The four connecting parts of the hinge can have a larger opening angle when the hinge is opened, so as to be suitable for different use scenes; the first connecting part 30, the second connecting part 40, the third connecting part 50 and the fourth connecting part 60 are accommodated between the cabinet fixed seat 10 and the door fixed seat 20 when the hinge is closed, so that the hinge has a small volume and does not occupy space. The first connecting part 30, the second connecting part 40, the fourth connecting part 60 and the fifth connecting part 81 are all double-plate structures, the first connecting part 30, the second connecting part 40, the third connecting part 50 and the fourth connecting part 60 are in different positions and form different gaps in the closing or opening process of the hinge, at this time, the double-plate structure of the connecting part protects other parts.

[0057] The above embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of deformations and improvements can be made, which are equivalent modifications and evolutions of the above embodiments according to the essential technology of the present application, and these all belong to the protection scope of the present application.​​​​​

Claims

1. A damping hinge comprising a door support, a cabinet support, a first connecting piece, a second connecting piece, a third connecting piece and a fourth connecting piece, two ends of the first connecting piece are rotatably connected with the door support and the fourth connecting piece respectively, two ends of the second connecting piece are rotatably connected with the door support and the fourth connecting piece respectively, two ends of the third connecting piece are rotatably connected with the cabinet support and the second connecting piece respectively, and the cabinet support is rotatably connected with the fourth connecting piece, characterized in that: The damping hinge further comprises a buffer assembly, the buffer assembly comprises a fifth connecting piece and a damper, the damper comprises a housing and a push rod installed on the housing, two ends of the fifth connecting piece are rotationally connected with the first connecting piece and the housing respectively, and the push rod is rotationally connected with the fourth connecting piece at the tail end.

2. The damper hinge according to claim 1, wherein: The first connecting piece comprises a guide column, and the fifth connecting piece is in contact with the guide column during rotation of the damping hinge from the critical state to the closed state.

3. The damper hinge according to claim 2, wherein: The first connecting piece comprises a first connecting wall and two first plates, the two first plates are parallel to each other, the first connecting wall connects the two first plates, and the guide column is located between the two first plates.

4. The damper hinge of claim 1, wherein: The fifth connecting piece comprises a fourth connecting wall and two fourth plates, the two fourth plates are parallel to each other, the fourth connecting wall connects the two fourth plates, and the housing is located between the two fourth plates and is rotationally connected with the two fourth plates.

5. The damper hinge of claim 1, wherein: The fifth connecting piece and the damper form an acute angle when the damping hinge is in the critical state and the closed state.

6. The damper hinge of claim 5, wherein: The fifth connecting piece and the damper form an obtuse angle when the damping hinge is in the open state.

7. The damper hinge of claim 1, wherein: The fourth connecting piece is provided with an eleventh hinge hole, a twelfth hinge hole and a fourteenth hinge hole, the eleventh hinge hole and the twelfth hinge hole are located at two ends of the fourth connecting piece respectively, the fourteenth hinge hole is located between the eleventh hinge hole and the twelfth hinge hole, the cabinet support is rotationally connected with the fourth connecting piece through the eleventh hinge hole, the first connecting piece is rotationally connected with the fourth connecting piece through the twelfth hinge hole, and the second connecting piece is rotationally connected with the fourth connecting piece through the fourteenth hinge hole.

8. The damper hinge of claim 7, wherein: The fourth connecting piece is further provided with a thirteenth hinge hole, the thirteenth hinge hole is located between the twelfth hinge hole and the fourteenth hinge hole, and the push rod is rotationally connected with the fourth connecting piece through the thirteenth hinge hole.

9. The damper hinge of claim 7, wherein: The second connecting piece comprises a driving part, the driving part is located at one end of the second connecting piece close to the fourth connecting piece, the damping hinge further comprises a self-closing assembly, one end of the self-closing assembly is rotationally installed on the fourth connecting piece, the other end of the self-closing assembly is slidingly installed on the fourth connecting piece, the driving part drives the self-closing assembly to rotate relative to the fourth connecting piece when the damping hinge rotates from the open state to the critical state, and the self-closing assembly moves along the fourth connecting piece under the action of elastic force when the damping hinge rotates from the critical state to the closed state, so that the damping hinge is self-closed.

10. The damper hinge of claim 9, wherein: The driving part comprises a contact surface, a convex and a groove, the contact surface is arc-shaped, the convex is between the contact surface and the groove, when the damping hinge rotates from the open state to the critical state, the self-closing assembly contacts with the contact surface, when the damping hinge is in the critical state, the self-closing assembly contacts with the convex, when the damping hinge rotates from the critical state to the closed state, the self-closing assembly falls into the groove through the convex.

11. The damper hinge of claim 10, wherein: The self-closing assembly comprises a main body, a trigger and an elastic piece, the main body is rotationally connected with the fourth connecting piece, the trigger is slidingly connected with the fourth connecting piece, the main body is inserted with the trigger, and the elastic piece is in contact with the main body and the trigger at both ends.

12. The damper hinge of claim 11, wherein: The self-closing assembly further comprises a rolling piece and a first rotating shaft, the rolling piece is installed on the first rotating shaft, the first rotating shaft is slidingly installed on the fourth connecting piece, an end of the trigger away from the main body is provided with a mounting portion, and the trigger is clamped with the first rotating shaft under the elastic force of the elastic piece.

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