Self-closing hinge

Abstract

The invention discloses a self-closing hinge and belongs to the field of hinges, the self-closing hinge comprises a door support, a cabinet support, four connecting pieces and a self-closing assembly, a driving piece is rotatably mounted on the first connecting piece, a guiding piece is movably mounted on the first connecting piece, convex teeth of the guiding piece are located between an abutting face and a groove, and a guiding column of the first connecting piece is located in a guiding groove; two ends of the elastic piece are respectively connected with the second connecting piece and the guide piece, and when the hinge is in an open state, the guide column abuts against the end part of the guide groove to keep the elastic piece in a stretching state; when the hinge moves from the open state to the critical state, the driving piece abuts against the abutting face to drive the guiding piece to move relative to the fourth connecting piece till the driving piece abuts against the protruding teeth. When the hinge moves from a critical state to a closed state, the driving piece crosses the convex teeth to fall into the groove, the hinge is driven by the elastic force of the elastic piece to move to the closed state, the abutting face, the groove, the convex teeth and the guide groove are integrated on one part of the guide piece, the number of hinge parts is small, the overall structure is simple, and the size is small.

Description

Technical Field

[0001] The present invention relates to hinges, and in particular to self-closing hinges. Background Art

[0002] In order to ensure its thermal insulation performance, the door of a refrigerator is usually thicker, which requires the hinge connecting the door to the refrigerator cabinet to have a larger opening to avoid interference between the door and the refrigerator cabinet during opening / closing. In particular, as built-in integrated refrigerators become more popular, the door of the refrigerator needs to be assembled to the cabinet door panel, which makes the thickness of the entire door even thicker, and the hinge must have a larger opening. In addition, the existing hinges usually have a self-closing function, so that when the refrigerator door is closed to a certain angle, the door automatically closes with the refrigerator cabinet to prevent the door from being loosely closed.

[0003] Existing hinges with large opening and self-closing functions are mostly implemented using cam mechanisms, which leads to a complex hinge structure. At the same time, there is also a problem that a large external force needs to be applied when the hinge enters the critical point of the self-closing stage, and there will be a more obvious sense of force suspension at the critical point, resulting in a poor user experience. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, one of the objects of the present 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 purposes of the present invention is achieved by the following technical solution:

[0006] A self-closing hinge comprises a door support, a cabinet support, a first connecting member, a second connecting member, a third connecting member and a fourth connecting member, wherein two ends of the first connecting member are rotatably connected to the door support and the fourth connecting member respectively, two ends of the second connecting member are rotatably connected to the door support and the fourth connecting member respectively, two ends of the third connecting member are rotatably connected to the cabinet support and the second connecting member respectively, and the cabinet support is rotatably connected to the fourth connecting member. The self-closing hinge also comprises a self-closing component, which comprises a driving member, a guiding member and an elastic member. The driving member is rotatably mounted on the first connecting member, and the guiding member is movably mounted on the first connecting member. The first connecting member is provided with a guide column, and the guide member is provided with a supporting surface, a groove, a convex tooth and a guide groove. The convex tooth is located between the supporting surface and the groove, and the guide column is located in the guide groove. Two ends of the elastic member are respectively connected to the second connecting member and the guide.

[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 member in a stretched state;

[0008] When the self-closing hinge moves from the open state to the critical state, the driving member contacts the abutting surface to drive the guide member to move relative to the fourth connecting member until the driving member contacts the convex tooth;

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

[0010] Furthermore, the fourth connecting member 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 member, the eleventh hinge hole is located between the ninth hinge hole and the tenth hinge hole, the cabinet support is rotatably connected to the fourth connecting member through the ninth hinge hole, the second connecting member is rotatably connected to the fourth connecting member through the eleventh hinge hole, and the first connecting member is rotatably connected to the fourth connecting member through the tenth hinge hole.

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

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

[0013] Furthermore, the guide groove is curved and is located on a side of the guide member.

[0014] Furthermore, the first connecting member includes a first plate body, and the guide column extends from the first plate body and is perpendicular to the first plate body.

[0015] Furthermore, the guiding member includes two ribs, the two ribs are respectively located on both sides of the supporting surface, the convex teeth and the groove, and the driving member is located between the two ribs.

[0016] Furthermore, the self-closing hinge also includes a first rotating shaft, the fourth connecting member and the first connecting member are rotatably connected via the first rotating shaft, the guide member is also provided with a rotating groove, the rotating groove abuts against the first rotating shaft, and the guide member rotates around the first rotating shaft.

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

[0018] Furthermore, the self-closing component also includes a limiting shaft, which is installed on the guiding member, and the fourth connecting member is provided with a sliding groove, in which the end of the limiting shaft is located.

[0019] Furthermore, the slide groove is linear.

[0020] Furthermore, the second connecting member is rotatably connected to the fourth connecting member through an eleventh hinge hole, the first connecting member is rotatably connected to the fourth connecting member through a tenth hinge hole, and the slide groove is located between the tenth hinge hole and the eleventh hinge hole.

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

[0022] Furthermore, the hinge with the self-closing function also includes a buffer component, which includes a shell and a damper. The shell is installed on the fourth connecting member, and the damper is installed on the shell and the damper is in conflict with the third connecting member.

[0023] Furthermore, the shell is provided with a protrusion, and the fourth connecting member is provided with a snap hole, and the protrusion is snapped with the snap hole.

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

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

[0026] (1) By providing a supporting surface, a groove, a convex tooth and a guide groove on one part of the guide, the self-closing function of the hinge is realized, the hinge has fewer parts, the overall structure is simple and the volume is small;

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

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

[0029] (4) The abutting surface, the convex teeth and the grooves have a smooth transition, and the external force required for the driving member to pass over the convex teeth is small, so the sense of force frustration is small and the user experience is good;

[0030] (5) The buffer component reduces the speed of the hinge's self-closing to prevent the user from being pinched. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional diagram of the self-closing hinge of the present invention in a critical state;

[0032] Figure 2 for Figure 1 An exploded view of the hinge with self-closing function in a critical state;

[0033] Figure 3 for Figure 1 A three-dimensional view of a first connecting member of a hinge having a self-closing function;

[0034] Figure 4 for Figure 1 A three-dimensional view of the second connecting member of the hinge with a self-closing function;

[0035] Figure 5 for Figure 1 A three-dimensional view of a fourth connecting member of a hinge having a 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 member;

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

[0039] Fig. 9 It is a three-dimensional diagram of the self-closing hinge of the present invention in a closed state;

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

[0041] Fig.11 A three-dimensional diagram of the self-closing hinge of the present invention in an open state;

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

[0043] In the figure: 10, door support; 11, bottom 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 connecting piece; 31, first connecting wall; 32, first plate body; 320, fourth hinge hole; 321, fifth hinge hole; 322, first mounting hole; 33, guide column; 40, second connecting piece; 41, second connecting wall; 42, second plate body; 420, sixth hinge hole; 421, seventh hinge hole; 422, eighth hinge hole; 50, third connecting piece; Connecting member; 60, fourth connecting member; 61, third connecting wall; 610, snap hole; 62, third plate body; 620, ninth hinge hole; 621, tenth hinge hole; 623, eleventh hinge hole; 624, slide groove; 70, self-closing assembly; 71, driving member; 72, guiding member; 721, rotating groove; 722, abutting surface; 723, groove; 724, convex tooth; 725, guiding groove; 726, second mounting hole; 727, retaining edge; 73, first rotating shaft; 74, limiting shaft; 75, elastic member; 76, second rotating shaft; 80, buffer assembly; 81, shell; 810, twelfth hinge hole; 811, protrusion; 82, damper; 83, third rotating shaft. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. 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 those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] like Figure 1 as well as Figure 2 As shown, the self-closing hinge of the present invention includes 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 component 70 and a buffer component 80.

[0048] The door support 10 is used to fix the door body. In the present embodiment, the self-closing hinge is applied to the refrigerator, and the door support 10 is fixed to the refrigerator door. Specifically, the door support 10 includes 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, and the first fixing hole 110 is used to fix with the refrigerator door. Each first side plate 12 is provided with a first hinge hole 120 and a second hinge hole 121, the first hinge hole 120 is used to be rotatably connected with the second connecting member 40, and the second hinge hole 121 is used to be rotatably connected with the first connecting member 30.

[0049] The cabinet support 20 is used to be fixed to the cabinet body. In the present 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 accommodating 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 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 connects the two second side plates 22. A 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, and the second fixing hole 210 is used to be fixed to 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 member 60 via the third hinge hole 220 , and the cabinet support 20 is rotatably connected to the third connecting member 50 via the end hinge hole 221 .

[0050] Please continue reading Figure 3The first connecting member 30 is a double-plate design with a U-shaped cross section. While increasing the structural strength, the interior of the first connecting member 30 can accommodate other components, reduce the volume of the hinge and protect other components. The first connecting member 30 includes a first connecting wall 31, two first plates 32 and two guide columns 33. The two first plates 32 extend from both sides of the first connecting wall 31, and the two first plates 32 are parallel to each other and perpendicular to the first connecting wall 31. The two first plates 32 and the first connecting wall 31 form a receiving space, which is used to accommodate the driving member 71 and the guiding member 72. Each guide column 33 is arranged on the inner wall of a first plate 32, and the guide column 33 is perpendicular to the first plate 32. The guide column 33 is used to keep the hinge in an open state to prevent the hinge from closing due to the restoring force of the elastic member 75 when it is in an 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 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 member 30 is rotatably connected to the fourth connecting member 60 through the fourth hinge hole 320, and the first connecting member 30 is rotatably 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 reading Figure 4 The second connecting member 40 is a double-plate design with a U-shaped cross section. While increasing the structural strength, the interior of the second connecting member 40 can accommodate other components, reduce the volume of the hinge and protect other components. Specifically, the second connecting member 40 includes a second connecting wall 41 and two second plates 42. The second connecting wall 41 is located between the two second plates 42 and connects the two second plates 42. The two second plates 42 are parallel to each other, and a receiving space is formed between the two second plates 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 member 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 member 50 through the eighth hinge hole 422.

[0054] Please continue reading Figure 2The third connecting member 50 is of a linear design, a first end of the third connecting member 50 is rotatably connected to the cabinet support 20 , and a second end of the third connecting member 50 is rotatably connected to the second connecting member 40 .

[0055] Please continue reading Figure 5 The fourth connecting member 60 is a double-plate design. While increasing the structural strength, the interior of the fourth connecting member 60 can accommodate other components, reduce the volume of the damping hinge and protect other components. The fourth connecting member 60 includes a third connecting wall 61 and two third plates 62. The third connecting wall 61 connects the two third plates 62. The two third plates 62 are parallel to each other, and a receiving space is formed between the two third plates 62.

[0056] The third connecting wall 61 defines a buckle hole 610 , which buckles with the protrusion 811 of the housing 81 to mount the housing 81 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 slide 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 slide groove 624 is located between the tenth hinge hole 621 and the eleventh hinge hole 623. The fourth connecting member 60 is rotatably connected to the cabinet support 20 through the ninth hinge hole 620, and the fourth connecting member 60 is rotatably connected to the first connecting member 30 through the tenth hinge hole 621. The fourth connecting member 60 is rotatably connected to the second connecting member 40 through the eleventh hinge hole 623. The slide groove 624 is linear, and the slide groove 624 is used to install the limit shaft 74, and by limiting the limit position of the limit shaft 74, the limit angle of rotation of the guide member 72 around the rotating shaft is limited.

[0058] Please continue reading Figure 2 The self-closing component 70 includes a driving member 71 , a guiding member 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 to drive the guide member 72 to rotate, and the driving member 71 is rotatably mounted on the first mounting hole 322 of the first connecting member 30. Specifically, the driving member 71 adopts a driving roller to reduce the hinge cost, and the external force required for closing is small.

[0060] Please continue reading Figure 6 as well as Figure 7The guide member 72 is provided with a rotation groove 721, abutting surface 722, a groove 723, a convex tooth 724, a guide groove 725, a second mounting hole 726 and a rib 727. The rotation groove 721 is located above the guide member 72, the abutting surface 722 is located at the front end of the guide member 72, the convex tooth 724 and the groove 723 are located below the guide member 72, the guide groove 725 is provided at the side of the guide member 72, the second mounting hole 726 is located at the end of the guide member 72, and the number of ribs 727 is two, and the two ribs 727 extend from the edge of the guide groove 725 to the edge of the convex tooth 724 and to the edge of the groove 723. The driving member 71 is located between the two ribs 727 to prevent the driving member 71 and the guide member 72 from being misaligned and unable to collide.

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

[0062] The abutting surface 722 is arc-shaped, and the driving member 71 abuts against the abutting surface 722 to drive the guide member 72 to rotate around the first rotating shaft 73. A convex tooth 724 is formed at the end of the abutting surface 722, and the convex tooth 724 abuts against the driving member 71 to put the hinge in a critical state. The groove 723 is located on the other side of the convex tooth 724. When the driving member 71 passes over the convex tooth 724 and falls into the groove 723, the hinge is converted from the critical state to the closed state and begins to close itself. The guide groove 725 is curved, and 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 force of the elastic member 75 to restore the deformation cannot pull the guide member 72, so that 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 to mount the limiting shaft 74 . The end of the limiting shaft 74 is located in the slide groove 624 . By limiting the limit position of the movement of the limiting shaft 74 , the limit angle of rotation of the guide member 72 around the rotating shaft is limited.

[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 to the fourth connecting member 60. Specifically, the elastic member 75 is a spring.

[0064] Please continue reading Figure 2The buffer assembly 80 includes a shell 81, a damper 82 and a third rotating shaft 83. The shell 81 is provided with a twelfth hinge hole 810 and a protrusion 811. The protrusion 811 is snapped with the snap hole 610 so that the shell 81 is installed 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 to the cabinet support 20 and the shell 81 can rotate around the third rotating shaft 83. The shell 81 is installed between the two first plates 32 of the first connecting member 30. The damper 82 is installed on the shell 81, and the damper 82 contacts the third connecting member 50, so that when the hinge closes, the speed is reduced to prevent the user from being pinched.

[0065] When using the damping hinge, the door support 10 is fixedly connected to the door body, and the cabinet support 20 is fixedly connected to the cabinet body. Figure 11-12 As shown, the angle between the door support 10 and the cabinet support 20 is an obtuse angle, which meets the requirement of a large hinge opening. At this time, the guide column 33 is located at the end of the guide groove 725 and contacts the end of the guide groove 725, so that the force of the elastic member 75 to restore the deformation cannot pull the guide member 72, so that the hinge remains in an 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 convex tooth 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 contacts the abutting surface 722, and the driving guide member 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. When the door body is closed to the critical state, as shown in FIG. Figure 1 as well as Figure 8 As shown, at this time, the driving member 71 contacts the convex tooth 724. When the door body is further closed, the driving member 71 passes over the convex tooth 724 and falls into the groove 723. At this time, the restoring force of the elastic member 75 pulls the guide member 72 to move, so that the hinge moves to the closed state until the hinge is closed. Fig. 9 as well as Fig.10 shown.

[0067] During the closing process of the hinge, the damper 82 of the buffer assembly 80 abuts against the third connecting member 50, so that the speed of the hinge closing itself is reduced to prevent the user from being pinched.

[0068] The hinge of the present application realizes the self-closing function of the hinge by setting a supporting surface 722, a groove 723, a convex tooth 724 and a guide groove 725 on a part of the guide member 72. The hinge has few parts, a simple overall structure and a small size. The roller is used as the driving member 71, and the hinge cost is low. The supporting surface 722 and the guide groove 725 are set on the same part, and the hinge transmission is more accurate. The supporting surface 722, the convex tooth 724 and the groove 723 have a smooth transition, and the external force required for the driving member 71 to pass over the convex tooth 724 is small, so the force application is small and the user experience is good. The buffer component 80 reduces the speed of the hinge self-closing to prevent the user from being pinched. The four connecting parts of the hinge enable the hinge to have a larger opening when it is opened, which is suitable for different usage scenarios. 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 fixing seat 10 and the door fixing seat 20, so that the hinge is small in size and does not occupy space. The first connecting member 30, the second connecting member 40 and the fourth connecting member 60 are all double-plate structures. When the hinge is closing or opening, the first connecting member 30, the second connecting member 40, the third connecting member 50 and the fourth connecting member 60 are in different positions and form different gaps. At this time, the double-plate structure of the connecting member protects other components.

[0069] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A self-closing hinge, comprising a door support, a cabinet support, a first connecting member, a second connecting member, a third connecting member and a fourth connecting member, wherein two ends of the first connecting member are rotatably connected to the door support and the fourth connecting member, respectively, two ends of the second connecting member are rotatably connected to the door support and the fourth connecting member, two ends of the third connecting member are rotatably connected to the cabinet support and the second connecting member, respectively, and the cabinet support is rotatably connected to the fourth connecting member, characterized in that: The self-closing hinge further comprises a self-closing component, which comprises a driving member, a guiding member and an elastic member, wherein the driving member is rotatably mounted on the first connecting member, the guiding member is movably mounted on the first connecting member, the first connecting member is provided with a guide column, the guiding member is provided with a supporting surface, a groove, a convex tooth and a guiding groove, the convex tooth is located between the supporting surface and the groove, the guiding column is located in the guiding groove, and both ends of the elastic member are respectively connected to the second connecting member and the guiding member, 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 member in a stretched state; When the self-closing hinge moves from the open state to the critical state, the driving member contacts the abutting surface to drive the guide member to move relative to the fourth connecting member until the driving member contacts the convex tooth; When the self-closing hinge moves from the critical state to the closed state, the driving member passes over the convex tooth and falls into the groove, and the elastic force of the elastic member drives the self-closing hinge to move to the closed state.

2. The self-closing hinge according to claim 1, characterized in that: The fourth connecting member 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 member, the eleventh hinge hole is located between the ninth hinge hole and the tenth hinge hole, the cabinet support is rotatably connected to the fourth connecting member through the ninth hinge hole, the second connecting member is rotatably connected to the fourth connecting member through the eleventh hinge hole, and the first connecting member is rotatably connected to the fourth connecting member through the tenth hinge hole.

3. The self-closing hinge according to claim 1, characterized in that: The abutting surface is arc-shaped and is located at the end of the first connecting member and faces outward.

4. The self-closing hinge according to claim 1, characterized in that: The groove is located at the bottom of the guide member, and the groove faces the door support.

5. The self-closing hinge according to claim 4, characterized in that: The guide groove is in a curved shape and is located on a side of the guide member.

6. The self-closing hinge according to claim 5, characterized in that: The first connecting member includes a first plate body, and the guide column extends from the first plate body and is perpendicular to the first plate body.

7. The self-closing hinge according to claim 1, characterized in that: The guiding member comprises two ribs, the two ribs are respectively located on both sides of the abutting surface, the convex teeth and the groove, and the driving member is located between the two ribs.

8. The self-closing hinge according to claim 1, characterized in that: The self-closing hinge also includes a first rotating shaft, the fourth connecting member is rotatably connected to the first connecting member via the first rotating shaft, the guide member is also provided with a rotating groove, the rotating groove abuts against the first rotating shaft, and the guide member rotates around the first rotating shaft.

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

10. The self-closing hinge according to claim 1, characterized in that: The self-closing component also includes a limiting shaft, which is installed on the guiding member. The fourth connecting member is provided with a sliding groove, and the end of the limiting shaft is located in the sliding groove.

11. The self-closing hinge according to claim 10, characterized in that: The slide groove is in a straight line shape.

12. The self-closing hinge according to claim 10, characterized in that: The second connecting member is rotatably connected to the fourth connecting member via an eleventh hinge hole, the first connecting member is rotatably connected to the fourth connecting member via a tenth hinge hole, and the slide groove is located between the tenth hinge hole and the eleventh hinge hole.

13. The self-closing hinge according to claim 10, characterized in that: The elastic member is connected to the limiting shaft.

14. The self-closing hinge according to claim 1, characterized in that: The hinge with the self-closing function further comprises a buffer assembly, which comprises a shell and a damper. The shell is mounted on the fourth connecting member, and the damper is mounted on the shell and abuts against the third connecting member.

15. The self-closing hinge according to claim 14, characterized in that: The shell is provided with a protrusion, and the fourth connecting member is provided with a buckle hole, and the protrusion is buckled with the buckle hole.

16. The self-closing hinge according to claim 1, characterized in that: The second connecting member 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 member is rotatably connected to the fourth connecting member through the sixth hinge hole, the second connecting member is rotatably connected to the door support through the seventh hinge hole, and the second connecting member is rotatably connected to the third connecting member through the eighth hinge hole.

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