Self-closing hinge

Abstract

The application discloses a self-closing hinge and belongs to the field of hinges. The hinge comprises a door support, a cabinet support, four connecting pieces and a self-closing assembly. A driving piece is rotatably installed on the first connecting piece, and a guide piece is movably installed on the first connecting piece. The protruding teeth of the guide piece are located between the bearing surface and the recess. The guide column of the first connecting piece is located in the guide groove. The two ends of the elastic piece are connected with the second connecting piece and the guide piece, respectively. When the hinge is in the open state, the guide column and the guide groove end abut to keep the elastic piece in the stretched state. When the hinge moves from the open state to the critical state, the driving piece and the bearing surface abut to drive the guide piece to move relative to the fourth connecting piece until the driving piece and the protruding teeth abut. When the hinge moves from the critical state to the closed state, the driving piece passes the protruding teeth and falls into the recess. The elastic force of the elastic piece drives the hinge to move to the closed state. The bearing surface, the recess, the protruding teeth and the guide groove are integrated on one part of the guide piece, so that the hinge has few parts, a simple overall structure and a small size.

Description

TECHNICAL FIELD

[0001] The present application relates to a hinge, in particular to a self-closing 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 interference between the door body and the refrigerator cabinet during opening / closing. Especially, with the current popularity of the built-in integrated refrigerator, the door body of the refrigerator also needs to be assembled to the cabinet door panel, which further thickens the entire door body, which inevitably requires the hinge to have a larger opening. In addition, the existing hinge usually has a self-closing function, which automatically closes the door body and the refrigerator cabinet after the door is closed to a certain angle, preventing the door body and the refrigerator cabinet from not being tightly closed.

[0003] The existing hinge with large opening and self-closing function is mostly realized by a cam mechanism, which leads to a complex hinge structure. At the same time, there is a large external force required at the critical point when the hinge enters the self-closing stage, and there is a clear force jerk at the critical point, which results in poor user experience. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the present application is to provide a self-closing hinge with a simple structure and a small external force required at the critical point when entering the self-closing stage.

[0005] One of the purposes of the present application is achieved by adopting the following technical solutions:

[0006] A self-closing 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 self-closing hinge further comprises a self-closing assembly, the self-closing assembly comprises a driving piece, a guide piece and an elastic piece, the driving piece is rotatably installed on the first connecting piece, the guide piece is movably installed on the first connecting piece, the first connecting piece is provided with a guide column, the guide piece is provided with an abutting surface, a groove, a protruding tooth and a guide groove, the protruding tooth is located between the abutting surface and the groove, the guide column is located in the guide groove, both ends of the elastic piece are connected with the second connecting piece and the guide piece,

[0007] When the self-closing hinge is in an open state, the guide column abuts against the end of the guide groove to keep the elastic piece in a stretched state;

[0008] When the self-closing hinge is moved from the open state to the critical state, the driving member drives the guide member to move relative to the fourth connecting piece until the driving member is in contact with the convex tooth.

[0009] When the self-closing hinge is moved from the critical state to the closed state, the driving member falls into the groove beyond the convex tooth, and the elastic force of the elastic member drives the self-closing hinge to move to the closed state.

[0010] Further, the fourth connecting piece is provided with a ninth hinge hole, a tenth hinge hole and an eleventh hinge hole, the ninth hinge hole and the tenth hinge hole are respectively located at two ends of the fourth connecting piece, and the eleventh hinge hole is located between the ninth hinge hole and the tenth hinge hole, the cabinet support is rotatably connected with the fourth connecting piece through the ninth hinge hole, the second connecting piece is rotatably connected with the fourth connecting piece through the eleventh hinge hole, and the first connecting piece is rotatably connected with the fourth connecting piece through the tenth hinge hole.

[0011] Further, the abutting surface is arc-shaped, and the abutting surface is located at the end of the first connecting piece and faces outward.

[0012] Further, the groove is located at the bottom of the guide member and faces the door support.

[0013] Further, the guide groove is curved, and the guide groove is located at the side of the guide member.

[0014] Further, the first connecting piece comprises a first plate body, and the guide column extends from the first plate body and is perpendicular to the first plate body.

[0015] Further, the guide member comprises two retaining edges, the two retaining edges are respectively located at two sides of the abutting surface, the convex tooth and the groove, and the driving member is located between the two retaining edges.

[0016] Further, the self-closing hinge further comprises a first rotating shaft, the fourth connecting piece and the first connecting piece are rotatably connected through the first rotating shaft, the guide member is further provided with a rotating groove, the rotating groove is in contact with the first rotating shaft, and the guide member rotates around the first rotating shaft.

[0017] Further, the rotating groove is of an open structure, and the opening of the rotating groove faces the cabinet support.

[0018] Further, the self-closing assembly further comprises a limiting shaft, the limiting shaft is mounted on the guide member, the fourth connecting piece is provided with a sliding groove, and the end of the limiting shaft is located in the sliding groove.

[0019] Further, the chute is in a straight line type.

[0020] Further, the second connecting piece is rotatably connected with the fourth connecting piece through an eleventh hinging hole, and the first connecting piece is rotatably connected with the fourth connecting piece through a tenth hinging hole, and the chute is located between the tenth hinging hole and the eleventh hinging hole.

[0021] Further, the elastic piece is connected with the limiting shaft.

[0022] Further, the self-closing function hinging piece further comprises a buffer assembly, the buffer assembly comprises a shell and a damper, the shell is mounted on the fourth connecting piece, and the damper is mounted on the shell and abuts against the third connecting piece.

[0023] Further, the shell is provided with a protrusion, the fourth connecting piece is provided with a buckle hole, and the protrusion is buckled with the buckle hole.

[0024] Further, the second connecting piece is provided with a sixth hinging hole, a seventh hinging hole and an eighth hinging hole, the eighth hinging hole is located between the sixth hinging hole and the seventh hinging hole, the second connecting piece is rotatably connected with the fourth connecting piece through the sixth hinging hole, the second connecting piece is rotatably connected with the door support through the seventh hinging hole, and the second connecting piece is rotatably connected with the third connecting piece through the eighth hinging hole.

[0025] Compared with the prior art, the self-closing hinging piece has the following advantages:

[0026] (1) By arranging the abutting surface, the groove, the protruding tooth and the guide groove on one part of the guide piece, the self-closing function of the hinging piece is realized, the hinging piece parts are less, the overall structure is simple, and the volume is small;

[0027] (2) The roller is used as the driving piece, and the hinging piece cost is low;

[0028] (3) The abutting surface and the guide groove are arranged on the same part, and the hinging piece transmission is more accurate;

[0029] (4) The abutting surface, the protruding tooth and the groove are smoothly transitioned, the external force required for the driving piece to pass over the protruding tooth is small, so that the force is small, the use experience is good, and the experience is good;

[0030] (5) The buffer assembly reduces the speed of the self-closing hinging piece, and prevents the user from being pinched. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a perspective view of the self-closing hinging piece in a critical state.

[0032] Figure 2 It is a perspective view of the self-closing hinging piece in a critical state.Figure 1 An exploded view of a hinge with self-closing function in a critical state.

[0033] Figure 3 for Figure 1 A perspective view of the first connector of the hinge with self-closing function;

[0034] Figure 4 for Figure 1 A perspective view of the second hinge connector with self-closing function;

[0035] Figure 5 for Figure 1 A three-dimensional view of the fourth connector of the hinge with self-closing function;

[0036] Figure 6 for Figure 1 A three-dimensional view of a hinge guide with a self-closing function;

[0037] Figure 7 for Figure 6 Another perspective view of the guide component;

[0038] Figure 8 for Figure 1 A three-dimensional sectional view of a hinge with a self-closing function;

[0039] Figure 9 This is a perspective view of the self-closing hinge of the present invention in the closed state;

[0040] Figure 10 for Figure 9 A three-dimensional sectional view of the self-closing function;

[0041] Figure 11 This is a perspective view of the self-closing hinge of the present invention in the open state;

[0042] Figure 12 for Figure 11 A three-dimensional sectional view of the self-closing function.

[0043] In the figure: 10, door support; 11, bottom plate; 110, first fixed hole; 12, first side plate; 120, first hinged hole; 121, second hinged hole; 20, cabinet support; 21, top plate; 210, second fixed hole; 22, second side plate; 220, third hinged hole; 221, end hinged hole; 30, first connecting piece; 31, first connecting wall; 32, first plate body; 320, fourth hinged hole; 321, fifth hinged hole; 322, first mounting hole; 33, guide column; 40, second connecting piece; 41, second connecting wall; 42, second plate body; 420, sixth hinged hole; 421, seventh hinged hole; 422, eighth hinged hole; 50, third connecting piece; 60, fourth connecting piece; 61, third connecting wall; 610, buckle hole; 62, third plate body; 620, ninth hinged hole; 621, tenth hinged hole; 623, eleventh hinged hole; 624, sliding groove; 70, self-closing assembly; 71, driving piece; 72, guide piece; 721, rotating groove; 722, abutting surface; 723, groove; 724, protruding tooth; 725, guide groove; 726, second mounting hole; 727, blocking edge; 73, first rotating shaft; 74, limiting shaft; 75, elastic piece; 76, second rotating shaft; 80, buffer assembly; 81, shell; 810, twelfth hinged hole; 811, protrusion; 82, damper; 83, third rotating shaft. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0045] It should be noted that when an assembly is referred to as being "fixed" to another assembly, it can be directly on the other assembly or can be fixed thereto by an intermediate assembly. When an assembly is referred to as being "connected" to another assembly, it can be directly connected to the other assembly or can be connected thereto by an intermediate assembly. When an assembly is referred to as being "disposed" on another assembly, it can be directly disposed on the other assembly or can be disposed thereon by an intermediate assembly. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0046] 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 this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "including", "comprising", "having" and the like are specifically intended to be construed in an inclusive sense and not to the exclusion of any other items.

[0047] As shown in Figure 1 and Figure 2 The self-closing hinge comprises a door support 10, a cabinet support 20, a first connecting member 30, a second connecting member 40, a third connecting member 50, a fourth connecting member 60, a self-closing assembly 70 and a buffer assembly 80.

[0048] The door support 10 is used for fixing the door body. In the embodiment, the self-closing hinge is applied to a refrigerator, and the door support 10 is fixed to the 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 member 40 and a second hinge hole 121 for rotationally connecting with the first connecting member 30.

[0049] The cabinet support 20 is used for fixing the cabinet body. In the embodiment, the self-closing hinge is applied to a 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 member 30, the second connecting member 40, the third connecting member 50, the fourth connecting member 60, the self-closing assembly 70 and the buffer assembly 80 when the hinge is closed. Specifically, the cabinet support 20 comprises 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 connects 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, which are located at the same end of the second side plate 22. The cabinet support 20 is rotationally connected with the fourth connecting member 60 through the third hinge hole 220, and the cabinet support 20 is rotationally connected with the third connecting member 50 through the end hinge hole 221.

[0050] Please continue to refer to Figure 3The first connecting piece 30 is designed in double-plate type, and has a U-shaped cross section. The first connecting piece 30 can accommodate other components in the interior thereof, thereby reducing the size of the hinge and protecting the other components. The first connecting piece 30 comprises a first connecting wall 31, two first plate bodies 32 and two guide columns 33. The two first plate bodies 32 extend from two sides of the first connecting wall 31, and 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 an accommodation space for accommodating the driving member 71 and the guide member 72. Each guide column 33 is arranged on an inner wall of a first plate body 32, and is perpendicular to the first plate body 32. The guide column 33 is used to keep the hinge in an open state, and prevent the hinge from being closed due to the restoring force of the elastic member 75 when the hinge is in the open state.

[0051] Each first plate body 32 is provided with a fourth hinge hole 320, a fifth hinge hole 321 and a first mounting hole 322. The fourth hinge hole 320 and the fifth hinge hole 321 are respectively located at two end portions of the first plate body 32. The first mounting hole 322 is located between the fourth hinge hole 320 and the fifth hinge hole 321. The first connecting piece 30 is rotationally connected to the fourth connecting piece 60 through the fourth hinge hole 320, and is rotationally connected to the door support 10 through the fifth hinge hole 321. The first mounting hole 322 is used to mount the driving member 71.

[0052] Please continue to refer to Figure 4 The second connecting piece 40 is designed in double-plate type, and has a U-shaped cross section. The second connecting piece 40 can accommodate other components in the interior thereof, thereby reducing the size of the hinge and protecting the other components. Specifically, the second connecting piece 40 comprises a second connecting wall 41 and two second plate bodies 42. 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 form an accommodation space therebetween. The accommodation space is used to accommodate other components.

[0053] 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 rotationally connected to the fourth connecting piece 60 through the sixth hinge hole 420, is rotationally connected to the door support 10 through the seventh hinge hole 421, and is rotationally connected to an end portion of the third connecting piece 50 through the eighth hinge hole 422.

[0054] Please continue to refer to Figure 2The third connecting member 50 is linearly designed, the first end of the third connecting member 50 is rotationally connected with the cabinet support 20, and the second end of the third connecting member 50 is rotationally connected with the second connecting member 40.

[0055] Please continue to refer to Figure 5 The fourth connecting member 60 is designed in a double-plate type, which can increase the structural strength, and the internal part of the fourth connecting member 60 can accommodate other components, thereby reducing the volume of the damping hinge and protecting other components. The fourth connecting member 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.

[0056] The third connecting wall 61 is provided with a buckle hole 610, the buckle hole 610 is buckled with the protrusion 811 of the shell 81, and the shell 81 is installed on the fourth connecting member 60.

[0057] Each third plate body 62 is provided with a ninth hinge hole 620, a tenth hinge hole 621, an eleventh hinge hole 623, and a sliding groove 624. The ninth hinge hole 620 and the tenth hinge hole 621 are respectively located at the two ends of the third plate body 62. The eleventh hinge hole 623 is located between the ninth hinge hole 620 and the tenth hinge hole 621. The sliding groove 624 is located between the tenth hinge hole 621 and the eleventh hinge hole 623. The fourth connecting member 60 is rotationally connected with the cabinet support 20 through the ninth hinge hole 620, the fourth connecting member 60 is rotationally connected with the first connecting member 30 through the tenth hinge hole 621, and the fourth connecting member 60 is rotationally connected with the second connecting member 40 through the eleventh hinge hole 623. The sliding groove 624 is linearly designed, and the sliding groove 624 is used for installing the limiting shaft 74, thereby limiting the limit position of the limiting shaft 74, and limiting the limit angle of the guide 72 rotating around the rotating shaft.

[0058] Please continue to refer to Figure 2 The self-closing assembly 70 includes a driving member 71, a guide 72, a first rotating shaft 73, a limiting shaft 74, an elastic member 75, and a second rotating shaft 76.

[0059] The driving member 71 is used for driving the guide 72 to rotate, and the driving member 71 is rotationally installed in the first mounting hole 322 of the first connecting member 30. Specifically, the driving member 71 adopts a driving roller, which can reduce the cost of the hinge and the external force required for closing.

[0060] Please continue to refer to Figure 6 and Figure 7The guide 72 is provided with a rotating groove 721, an abutting surface 722, a recess 723, a protruding tooth 724, a guide groove 725, a second mounting hole 726, and a stop edge 727. The rotating groove 721 is located at the top of the guide 72, the abutting surface 722 is located at the front end of the guide 72, the protruding tooth 724 and the recess 723 are located at the bottom of the guide 72, the guide groove 725 is arranged at the side of the guide 72, the second mounting hole 726 is located at the end of the guide 72, and the two stop edges 727 extend from the edge of the guide groove 725 to the edge of the protruding tooth 724 and to the edge of the recess 723. The driving member 71 is located between the two stop edges 727, preventing the driving member 71 from being misaligned with the guide 72, which would prevent the abutting.

[0061] Specifically, the rotating groove 721 is in the shape of a circular arc, the rotating groove 721 abuts against the first rotating shaft 73, the guide 72 rotates around the first rotating shaft 73, and the first rotating shaft 73 rotationally connects the fourth connecting member 60 and the first connecting member 30. The first rotating shaft 73 is located at the end of the fourth connecting member 60 away from the buffer assembly 80 and at the top end of the first connecting member 30.

[0062] The abutting surface 722 is arc-shaped, the driving member 71 abuts against the abutting surface 722 to drive the guide 72 to rotate around the first rotating shaft 73. The abutting surface 722 forms a protruding tooth 724 at the end, the protruding tooth 724 abuts against the driving member 71 to make the hinge in a critical state. The recess 723 is located on the other side of the protruding tooth 724, when the driving member 71 passes the protruding tooth 724 and falls into the recess 723, the hinge changes from the critical state to the closed state and starts to close automatically. The guide groove 725 is in the shape of a curve, the guide column 33 is located in the guide groove 725 and moves along the guide groove 725. When the hinge is in the open state, the guide column 33 moves to the end of the guide groove 725 and abuts against the end of the guide groove 725, so that the restoring deformation force of the elastic member 75 cannot pull the guide 72, and the hinge remains in the open state, preventing the elastic member 75 from automatically closing the hinge. The second mounting hole 726 is used to mount the limiting shaft 74, the end of the limiting shaft 74 is located in the sliding groove 624, and the limiting shaft 74 is limited in the limit position, thereby limiting the limit angle of the guide 72 rotating around the rotating shaft.

[0063] One end of the elastic member 75 is fixed to the second rotating shaft 76, and the other end is fixed to the limiting shaft 74. The second rotating shaft 76 is located in the sixth hinge hole 420 and the eleventh hinge hole 623, so that the second connecting member 40 and the fourth connecting member 60 are rotationally connected. Specifically, the elastic member 75 is a spring.

[0064] Please continue to refer to Figure 2The buffer assembly 80 comprises a housing 81, a damper 82 and a third pivot 83. The housing 81 is provided with a twelfth hinge hole 810 and a protrusion 811. The protrusion 811 is buckled with the buckle hole 610, so that the housing 81 is installed on the fourth connecting piece 60. The third pivot 83 is located in the twelfth hinge hole 810, the third hinge hole 220 and the ninth hinge hole 620, so that the fourth connecting piece 60 is rotatably connected with the cabinet support 20, and the housing 81 can rotate around the third pivot 83. The housing 81 is installed between the two first plate bodies 32 of the first connecting piece 30. The damper 82 is installed on the housing 81. The damper 82 is in contact with the third connecting piece 50, so that the speed of the hinge is reduced when the hinge is self-closed, preventing the user from being pinched.

[0065] When the damper 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 a fully open state, as shown in FIG. 8, the included angle between the door support 10 and the cabinet support 20 is obtuse, meeting the requirement of large opening degree of the hinge. At this time, the guide column 33 is located at the end of the guide groove 725 and is in contact with the end of the guide groove 725, so that the restoring deformation force of the elastic member 75 cannot pull the guide member 72, and the hinge remains in the open state, preventing the elastic member 75 from automatically closing the hinge. At this time, the driving member 71 is located at the end of the abutting surface 722 away from the protruding tooth 724. Figures 11-12

[0066] When the door needs to be closed, an external force is applied to the door body, the door body starts to close, and the hinge changes from the open state to the critical state. The driving member 71 is in contact with the abutting surface 722, and drives the guide member 72 to rotate around the first pivot 73. The guide column 33 is located in the guide groove 725 and moves along the guide groove 725. When the door body is closed to the critical state, as shown in FIG. 9, at this time, the driving member 71 is in contact with the protruding tooth 724. When the door body is further closed, the driving member 71 passes through the protruding tooth 724 and falls into the groove 723. At this time, the restoring deformation force of the elastic member 75 pulls the guide member 72 to move, so that the hinge moves to the closed state, and the door body is completely closed, as shown in FIG. 10. Figure 1 Figure 8 Figure 9 Figure 10

[0067] During the closing process of the hinge, the damper 82 of the buffer assembly 80 is in contact with the third connecting piece 50, so that the speed of the hinge is reduced when the hinge is self-closed, preventing the user from being pinched.

[0068] ​​​​​The hinge of the present application realizes the self-closing function of the hinge by setting the abutting surface 722, the groove 723, the convex tooth 724 and the guide groove 725 on one part of the guide 72, the hinge parts are less, the overall structure is simple, and the volume is small; the roller is used as the driving part 71, the hinge cost is low; the abutting surface 722 and the guide groove 725 are set on the same part, the hinge transmission is more accurate; the abutting surface 722, the convex tooth 724 and the groove 723 are smoothly transitioned, the driving part 71 needs smaller external force to pass the convex tooth 724, so that the force is small, the use experience is good; the buffer assembly 80 reduces the speed of the self-closing of the hinge, and prevents the user from being pinched. The four connecting parts of the hinge can have a larger opening degree when the hinge is opened, and are suitable for different use scenes; when closed, 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, so that the hinge is small in size and does not occupy space. The first connecting part 30, the second connecting part 40 and the fourth connecting part 60 are all double-plate structures, and 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 during the closing or opening process of the hinge, at this time, the double-plate structure of the connecting part protects other parts.

[0069] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are equivalent modifications and evolution 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 self-closing 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 self-closing hinge further comprises a self-closing assembly, the self-closing assembly comprises a driving piece, a guiding piece and an elastic piece, the driving piece is rotatably installed on the first connecting piece, the guiding piece is movably installed on the first connecting piece, the first connecting piece is provided with a guide post, the guiding piece is provided with an abutting surface, a groove, a protruding tooth and a guiding groove, the protruding tooth is located between the abutting surface and the groove, the guide post is located in the guiding groove, the elastic piece is connected with the second connecting piece and the guiding piece at two ends respectively, When the self-closing hinge is in an open state, the guide post abuts against the end of the guiding groove to keep the elastic piece in a stretched state; When the self-closing hinge moves from the open state to a critical state, the driving piece abuts against the abutting surface to drive the guiding piece to move relative to the fourth connecting piece until the driving piece abuts against the protruding tooth; When the self-closing hinge moves from the critical state to a closed state, the driving piece falls into the groove by passing the protruding tooth, and the elastic force of the elastic piece drives the self-closing hinge to move to the closed state.

2. The self-closing hinge of claim 1, wherein: The fourth connecting piece is provided with a ninth hinge hole, a tenth hinge hole and an eleventh hinge hole, the ninth hinge hole and the tenth hinge hole are located at two ends of the fourth connecting piece respectively, the eleventh hinge hole is located between the ninth hinge hole and the tenth hinge hole, the cabinet support is rotatably connected with the fourth connecting piece through the ninth hinge hole, the second connecting piece is rotatably connected with the fourth connecting piece through the eleventh hinge hole, and the first connecting piece is rotatably connected with the fourth connecting piece through the tenth hinge hole.

3. The self-closing hinge of claim 1, wherein: The abutting surface is arc-shaped, and the abutting surface is located at the end of the first connecting piece and faces outward.

4. The self-closing hinge of claim 1, wherein: The groove is located at the bottom of the guiding piece and faces the door support.

5. The self-closing hinge of claim 4, wherein: The guiding groove is curved, and the guiding groove is located at the side of the guiding piece.

6. The self-closing hinge of claim 5, wherein: The first connecting piece comprises a first plate body, and the guide post extends from the first plate body and is perpendicular to the first plate body.

7. The self-closing hinge of claim 1, wherein: The guiding piece comprises two retaining edges, the two retaining edges are located on both sides of the abutting surface, the protruding tooth and the groove respectively, and the driving piece is located between the two retaining edges.

8. The self-closing hinge of claim 1, wherein: The self-closing hinge further comprises a first rotating shaft, the fourth connecting piece and the first connecting piece are rotatably connected through the first rotating shaft, the guiding piece is further provided with a rotating groove, the rotating groove abuts against the first rotating shaft, and the guiding piece rotates around the first rotating shaft.

9. The self-closing hinge of claim 8, wherein: The rotating groove is of an open structure, and the opening of the rotating groove faces the cabinet support.

10. The self-closing hinge of claim 1, wherein: The self-closing assembly further comprises a limiting shaft, the limiting shaft is installed on the guiding piece, the fourth connecting piece is provided with a sliding groove, and the end of the limiting shaft is located in the sliding groove.

11. The self-closing hinge of claim 10, wherein: The sliding groove is linear.

12. The self-closing hinge of claim 10, wherein: The second connecting piece is rotatably connected with the fourth connecting piece through the eleventh hinge hole, the first connecting piece is rotatably connected with the fourth connecting piece through the tenth hinge hole, and the sliding groove is located between the tenth hinge hole and the eleventh hinge hole.

13. The self-closing hinge of claim 10, wherein: The elastic piece is connected with the limiting shaft.

14. The self-closing hinge of claim 1, wherein: The self-closing hinge further comprises a buffer assembly, the buffer assembly comprises a housing and a damper, the housing is mounted on the fourth connecting piece, the damper is mounted on the housing and the damper is in abutment with the third connecting piece.

15. The self-closing hinge of claim 14, wherein: The housing is provided with a protrusion, the fourth connecting piece is provided with a buckle hole, and the protrusion is buckled with the buckle hole.

16. The self-closing hinge of claim 1, wherein: The second connecting piece is provided with a sixth hinge hole, a seventh hinge hole and an eighth hinge hole, the eighth hinge hole is located between the sixth hinge hole and the seventh hinge hole, the second connecting piece is rotatably connected with the fourth connecting piece through the sixth hinge hole, the second connecting piece is rotatably connected with the door support through the seventh hinge hole, and the second connecting piece is rotatably connected with the third connecting piece through the eighth hinge hole.

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