Self-closing hinge

Abstract

The present invention belongs to the field of hinges. Disclosed is a self-closing hinge, comprising a door support, a cabinet support, four connecting members and a self-closing assembly. A driving member is rotatably mounted on a first connecting member; a guide member is movably mounted on the first connecting member; a protruding tooth of the guide member is located between an abutting surface and a recess; a guide post of the first connecting member is located in a guide channel; two ends of an elastic member are respectively connected to a second connecting member and the guide member. When the hinge is in an open state, the guide post abuts against an end part of the guide channel to keep the elastic member in a stretched state. When the hinge moves from the open state to a critical state, the driving member abuts against the abutting surface to drive the guide member to move relative to a fourth connecting member until the driving member abuts against the protruding tooth. When the hinge moves from the critical state to a closed state, the driving member passes over the protruding tooth to fall into the recess, such that the elastic force of the elastic member drives the hinge to move to the closed state. Integrating the abutting surface, the recess, the protruding tooth and the guide channel into a single part. i.e. the guide member, allows the hinge to have fewer parts, a simpler overall structure and a small size.

Description

Self-closing hinge Technical Field

[0001] This invention relates to hinges, and more particularly to self-closing hinges. Background Technology

[0002] To ensure proper thermal insulation, refrigerator doors are typically quite thick. This necessitates a large hinge opening angle to prevent interference between the door and the refrigerator cabinet during opening and closing. This is especially true with the increasing popularity of built-in refrigerators, where the door is further integrated into the cabinet door panel, further increasing the overall door thickness and requiring even larger hinge opening angles. Furthermore, existing hinges often feature a self-closing function, automatically closing the door to the cabinet after it reaches a certain angle, preventing any gaps between the door and the cabinet.

[0003] Existing hinges with large opening angles and self-closing functions mostly use cam mechanisms, which results in complex hinge structures. In addition, the hinges require a large external force to enter the self-closing stage and there is a noticeable force jerking sensation at the critical point, resulting in a poor user experience. Summary of the Invention

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

[0005] One of the objectives of this invention is achieved through the following technical solution:

[0006] A self-closing hinge includes a door support, a cabinet support, a first connector, a second connector, a third connector, and a fourth connector. The two ends of the first connector are rotatably connected to the door support and the fourth connector, respectively. The two ends of the second connector are rotatably connected to the door support and the fourth connector, respectively. The two ends of the third connector are rotatably connected to the cabinet support and the second connector, respectively. The cabinet support is rotatably connected to the fourth connector. The self-closing hinge also includes a self-closing assembly, which includes a driving member, a guiding member, and an elastic member. The driving member is rotatably mounted on the first connector, and the guiding member is movably mounted on the first connector. The first connector has a guide post, and the guiding member has a bearing surface, a groove, a tooth, and a guide slot. The tooth is located between the bearing surface and the groove, and the guide post is located in the guide slot. The two ends of the elastic member are connected to the second connector and the guiding member, respectively.

[0007] When the self-closing hinge is in the open state, the guide post abuts against the end of the guide groove to keep the elastic element 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 on both 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] Furthermore, the groove is linear.

[0020] Furthermore, the second connector is rotatably connected to the fourth connector through the eleventh hinge hole, and the first connector is rotatably connected to the fourth connector through the tenth hinge hole. The slide is located between the tenth hinge hole and the eleventh hinge hole.

[0021] Furthermore, the elastic element is connected to the limiting shaft.

[0022] Furthermore, the self-closing hinge also includes a buffer assembly, which includes a housing and a damper. The housing is mounted on the fourth connector, and the damper is mounted on the housing and abuts against the third connector.

[0023] Furthermore, the housing is provided with a protrusion, and the fourth connector is provided with a snap-fit ​​hole, the protrusion snapping into the snap-fit ​​hole.

[0024] Furthermore, the second connector 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 connector is rotatably connected to the fourth connector through the sixth hinge hole, the second connector is rotatably connected to the door support through the seventh hinge hole, and the second connector is rotatably connected to the third connector through the eighth hinge hole.

[0025] Compared with existing technologies, the self-closing hinge of the present invention has the following advantages:

[0026] (1) By setting a bearing surface, groove, tooth and guide groove on a guide part, the self-closing function of the hinge is realized. The hinge has fewer parts, simple overall structure and small size.

[0027] (2) Using rollers as the driving component results in low hinge cost;

[0028] (3) The abutment surface and the guide groove are set on the same part, making the hinge transmission more precise;

[0029] (4) The smooth transition between the abutment surface, the protrusions and the grooves means that the external force required for the drive component to pass over the protrusions is small, resulting in less jerking when applying force and a better user experience.

[0030] (5) The buffer component reduces the speed at which the hinge closes itself, preventing injury to the user. Attached Figure Description

[0031] Figure 1 is a perspective view of the self-closing hinge of the present invention in a critical state;

[0032] Figure 2 is an exploded view of the hinge with self-closing function in Figure 1 in a critical state.

[0033] Figure 3 is a perspective view of the first connector of the self-closing hinge in Figure 1;

[0034] Figure 4 is a perspective view of the second hinge connector with self-closing function shown in Figure 1;

[0035] Figure 5 is a perspective view of the fourth connector of the self-closing hinge in Figure 1;

[0036] Figure 6 is a perspective view of the hinge guide with self-closing function in Figure 1;

[0037] Figure 7 is another perspective view of the guide component in Figure 6;

[0038] Figure 8 is a three-dimensional sectional view of the hinge with self-closing function shown in Figure 1.

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

[0040] Figure 10 is a three-dimensional sectional view of the self-closing function in Figure 9;

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

[0042] Figure 12 is a three-dimensional sectional view of the self-closing function in Figure 11.

[0043] 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; 321. Fifth hinge hole; 322. First 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; 50. Third connecting... 60. Fourth connecting piece; 61. Third connecting wall; 610. Snap-fit ​​hole; 62. Third plate; 620. Ninth hinge hole; 621. Tenth hinge hole; 623. Eleventh hinge hole; 624. Slide groove; 70. Self-closing assembly; 71. Driving component; 72. Guide component; 721. Rotating groove; 722. Supporting surface; 723. Groove; 724. Protruding tooth; 725. Guide groove; 726. Second mounting hole; 727. Edge retainer; 73. First rotating shaft; 74. Limiting shaft; 75. Elastic component; 76. Second rotating shaft; 80. Buffer assembly; 81. Housing; 810. Twelfth hinge hole; 811. Protrusion; 82. Damper; 83. Third rotating shaft. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely 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. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0045] 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 on the other component or can be disposed thereon via another intermediate component. 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. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] As shown in FIG. 1 and FIG. 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 a door body. In the present embodiment, the self-closing 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 to 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 to be fixed with the cabinet body. In the embodiment, the self-closing 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 rotationally connected with the fourth connecting piece 60 through the third hinge hole 220, and the cabinet support 20 is rotationally connected with the third connecting piece 50 through the end hinge hole 221.

[0050] Please continue to refer to FIG. 3, the first connecting piece 30 is designed as a double-plate type and has a U-shaped cross section, which can not only increase the structural strength, but also can accommodate other components in the interior of the first connecting piece 30, 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 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 driving member 71 and the guide member 72. Each guide column 33 is arranged on the 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, and the fourth hinge hole 320 and the fifth hinge hole 321 are respectively located at the two ends 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 with the fourth connecting piece 60 through the fourth hinge hole 320, and the first connecting piece 30 is rotationally connected with 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 a double-plate design, the cross-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 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 a receiving space is formed between the two second plate bodies 42. The receiving 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 rotatably connected to the fourth connecting piece 60 through the sixth hinge hole 420, the second plate body 42 is rotatably connected to the door support 10 through the seventh hinge hole 421, and the second plate body 42 is rotatably connected to the end of the third connecting piece 50 through the eighth hinge hole 422.

[0054] Please continue to refer to Figure 2, the third connecting piece 50 is a straight line type design, the first end of the third connecting piece 50 is rotatably connected to the cabinet support 20, and the second end of the third connecting piece 50 is rotatably connected to the second connecting piece 40.

[0055] Please continue to refer to Figure 5, the fourth connecting piece 60 is a double-plate 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.

[0056] The third connecting wall 61 is provided with a buckle hole 610, and the buckle hole 610 is buckled with the protrusion 811 of the shell 81 to enable the shell 81 to be mounted on the fourth connecting piece 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 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 piece 60 is rotatably connected with the cabinet support 20 through the ninth hinge hole 620, and the fourth connecting piece 60 is rotatably connected with the first connecting piece 30 through the tenth hinge hole 621. The fourth connecting piece 60 is rotatably connected with the second connecting piece 40 through the eleventh hinge hole 623. The sliding groove 624 is in a straight line type, and the sliding groove 624 is used for mounting a limiting shaft 74, and by limiting the limit position of the limiting shaft 74, the limit angle of rotation of the guide 72 around the rotating shaft is limited.

[0058] Please continue to refer to FIG. 2, the closed assembly 70 includes a driving piece 71, a guide 72, a first rotating shaft 73, a limiting shaft 74, an elastic piece 75 and a second rotating shaft 76.

[0059] The driving piece 71 is used for driving the guide 72 to rotate, and the driving piece 71 is rotatably installed in the first mounting hole 322 of the first connecting piece 30. Specifically, the driving piece 71 adopts a driving roller, which reduces the cost of the hinge and requires less external force when closing.

[0060] Please continue to refer to FIG. 6 and FIG. 7, the 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 blocking edge 727. The rotating groove 721 is located at the upper part 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 lower part 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 number of the blocking edges 727 is two. The two blocking 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, and the driving piece 71 is located between the two blocking edges 727, preventing the driving piece 71 and the guide 72 from being dislocated to cause failure to abut.

[0061] Specifically, the rotating groove 721 is in a circular arc shape, 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 rotatably connects the fourth connecting piece 60 and the first connecting piece 30. The first rotating shaft 73 is located at the end of the fourth connecting piece 60 away from the buffer assembly 80 and at the top end of the first connecting piece 30.

[0062] The abutting surface 722 is arc-shaped, the driving member 71 abuts against the abutting surface 722 to drive the guide member 72 to rotate around the first rotating shaft 73. The abutting surface 722 has a protrusion 724 at the end thereof, the protrusion 724 abuts against the driving member 71 to make the hinge in a critical state. A groove 723 is located on the other side of the protrusion 724, when the driving member 71 passes the protrusion 724 and falls into the groove 723, the hinge is switched from the critical state to a closed state, and the self-closing is started. The guide groove 725 is curved, the guide column 33 is located in the guide groove 725 and moves along the guide groove 725, when the hinge is in an 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 member 72, the hinge remains in the open state, and the elastic member 75 is prevented from automatically closing the hinge. The second mounting hole 726 is used for mounting 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 to move to the limit position, so that the guide member 72 is limited to rotate around the rotating shaft to the limit angle.

[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 is rotatably connected with the fourth connecting member 60. Specifically, the elastic member 75 is a spring.

[0064] Please continue to refer to FIG. 2, the buffer assembly 80 includes a housing 81, a damper 82 and a third rotating shaft 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 to enable the housing 81 to be mounted on the fourth connecting member 60. The third rotating shaft 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 member 60 is rotatably connected with the cabinet support 20 and the housing 81 can rotate around the third rotating shaft 83. The housing 81 is mounted between the two first plate bodies 32 of the first connecting member 30. The damper 82 is mounted on the housing 81, and the damper 82 abuts against the third connecting member 50, so that when the hinge is self-closed, the speed is reduced, and the user is prevented from being pinched.

[0065] 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 a fully open state, as shown in FIGS. 11-12, the included angle between the door support 10 and the cabinet support 20 is obtuse, which meets 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 abuts against the end of the guide groove 725, so that the restoring deformation force of the elastic member 75 cannot pull the guide member 72, the hinge remains in the open state, and the elastic member 75 is prevented 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 protrusion 724.

[0066] 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 driving member 71 is in contact with the abutting surface 722, and the driving guide 72 rotates around the first rotating shaft 73. The guide column 33 is located in the guide groove 725 and moves along the guide groove 725, and when the door body is closed to the critical state, as shown in FIG. 1 and FIG. 8, at this time, the driving member 71 is in contact with the convex tooth 724, and when the door body is further closed, the driving member 71 passes the convex tooth 724 and falls into the recess 723, at this time, the restoring deformation force of the elastic member 75 pulls the guide 72 to move, so that the hinge moves to the closed state, and the hinge is closed, as shown in FIG. 9 and FIG. 10.

[0067] During the closing 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 closed, and the user is prevented from being pinched.

[0068] The hinge of the present application realizes the self-closing function of the hinge by arranging the abutting surface 722, the recess 723, the convex tooth 724 and the guide groove 725 on one part of the guide 72, the hinge has few parts, simple overall structure and small size; the roller is used as the driving member 71, the cost of the hinge is low; the abutting surface 722 and the guide groove 725 are arranged on the same part, the transmission of the hinge is more accurate; the abutting surface 722, the convex tooth 724 and the recess 723 are smoothly transitioned, the external force required for the driving member 71 to pass the convex tooth 724 is small, so that the force is small and the user 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 pieces of the hinge enable the hinge to have a larger opening degree when the hinge is opened, and are suitable for different use scenarios; the first connecting piece 30, the second connecting piece 40, the third connecting piece 50 and the fourth connecting piece 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 small size and does not occupy space. The first connecting piece 30, the second connecting piece 40 and the fourth connecting piece 60 are all double-plate structures, and the first connecting piece 30, the second connecting piece 40, the third connecting piece 50 and the fourth connecting piece 60 are in different positions and form different gaps during the closing or opening of the hinge, at this time, the double-plate structure of the connecting piece 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 a limitation on the scope of the patent. It should be noted that for ordinary skilled persons 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 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 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 hinge of the self-closing function 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 contact 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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