Refrigerator six-connecting-rod door hinge with opening and closing buffering function

Abstract

The invention relates to a refrigerator six-connecting-rod door hinge with an opening and closing buffering function, and belongs to the technical field of refrigerators. The six-connecting-rod door hinge comprises a first four-connecting-rod mechanism, a second four-connecting-rod mechanism, a first spring plunger cylindrical telescopic rod, a second elastic pin seat, a second spring plunger cylindrical telescopic rod, a positioning stud, a damping sliding block, a cylindrical positioning pin, a stud and the like. When the refrigerator is opened and closed, the second spring plunger cylindrical telescopic rod slides out of or slides in the groove of the damping sliding block, the damping sliding block can provide corresponding damping force for the refrigerator door when the refrigerator door is opened and closed, the aims that the refrigerator door is closed slowly and is difficult to open are achieved, and the opening and closing buffering function is achieved. When the refrigerator door reaches the maximum door opening angle of 120 degrees, the first connecting rod makes contact with the first spring plunger cylindrical telescopic rod, so that the refrigerator door rebounds to the position of 90 degrees, and door opening rebounding of the refrigerator door is achieved. And meanwhile, the door can be automatically closed within 30 degrees.

Description

Technical Field

[0001] This invention relates to a six-bar door hinge for a refrigerator with a buffer function for opening and closing, belonging to the field of refrigerator technology. Background Technology Refrigerator door hinges typically include pivot hinges and linkage hinges. Pivot hinges open and close the refrigerator door through the rotational engagement of the hinge pivot and the hinge hole. Grooves in the hinge pivot allow for control of the door's opening and closing trajectory, and the addition of a latch makes the door less likely to open easily. Linkage hinges open and close the refrigerator door through the movement of multiple links. The dead point position of the linkage mechanism determines the maximum opening angle of the refrigerator door. This type of refrigerator door hinge also includes an automatic door closing mechanism.

[0002] The utility model patent "Refrigerator Door Hinge Device and Refrigerator" (patent number CN219197029U) discloses a shaft-type hinge. This hinge structure uses upper and lower hinge shafts that engage with upper and lower door sleeves to allow the door to rotate around a fixed hinge shaft, thus opening the door. It also includes a height adjustment component to raise and lower the hinge shaft. However, this hinge structure can only rotate around a fixed hinge shaft, resulting in a limited opening angle for the refrigerator door and affecting the user experience.

[0003] The utility model patent "Multi-link Hinge, Refrigerator" (patent number CN219197032U) discloses a five-link hinge. The door connecting seat of this device has a sliding groove, and the linkage assembly includes three links. One link is rotatably connected to the cabinet mounting seat, and the other two links are interlocked at one end. One of the other two links is rotatably connected to the cabinet mounting seat, and the other is rotatably connected to the door connecting seat. The positioning concave surface and sliding surface on the protruding stop of this device cooperate to achieve a buffer for opening and closing the door. However, this device lacks a door-opening rebound function. When the hinge moves to its maximum opening angle, the links collide with each other, easily damaging the links and affecting the hinge's service life.

[0004] The utility model patent "An Embedded Refrigerator Buffer Hinge Without Suspension" (patent number CN208605069U) discloses a six-bar hinge. The device's elastic buffer element and transmission link form a rotary connection structure. When the hinge seat rotates between 0° and 30°, it provides closing assistance; when the hinge seat rotates between 30° and 60°, it provides opening assistance; and at angles between 60° and 115°, the hinge seat is in a free-moving state, with a maximum opening angle of 115° for the refrigerator door. The device includes a door closer for automatic closing buffering, but it cannot achieve both door locking and opening buffering functions, potentially affecting the normal use of the refrigerator door.

[0005] Therefore, there is an urgent need to design a refrigerator door hinge structure that can both have a buffer function for opening and closing and enable a wider opening angle. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a six-bar linkage door hinge for refrigerators with a buffering opening and closing function. The buffering function is achieved through the sliding contact between a second spring-loaded plunger cylindrical telescopic rod and a damping slider. When opening and closing the refrigerator door, the second spring-loaded plunger cylindrical telescopic rod slides out or in from the groove of the damping slider. The damping slider provides a damping force to the refrigerator door, resulting in a slow closing and a more difficult opening, thus providing a buffering function. When the refrigerator door reaches its maximum opening angle of 120°, the first linkage contacts the first spring-loaded plunger cylindrical telescopic rod, allowing the refrigerator door to spring back to a 90° position, achieving door opening rebound. The second spring-loaded plunger cylindrical telescopic rod then contacts the damping slider. When a critical state is reached, the second spring-loaded plunger cylindrical telescopic rod slides into the groove of the damping slider, achieving automatic closing within 30°.

[0007] This invention provides a refrigerator six-bar door hinge with opening and closing buffer function, which is connected between the refrigerator and the refrigerator door. The refrigerator six-bar door hinge includes a first fixed base connected to the refrigerator and a second fixed base connected to the refrigerator door. The first fixed base is hinged to a first link and a fourth link. The first link is also hinged to a second link and a third link. The second link and the third link are both hinged to the second fixed base. The fourth link is also hinged to the third link. An opening and closing buffer assembly is provided between the third link and the fourth link. The opening and closing buffer assembly includes a second spring plunger cylindrical telescopic rod disposed on the third link through a second elastic pin seat and a damping slider disposed on the fourth link. The second spring plunger cylindrical telescopic rod abuts against the damping slider. A spring is provided inside the second spring plunger cylindrical telescopic rod. The damping slider has a continuous smooth curved surface. When the refrigerator door is open, the smooth curved surface of the damping slider contacts and engages with the second spring plunger cylindrical telescopic rod, compressing the rod. When the refrigerator door is closed, the second spring plunger cylindrical telescopic rod remains in its natural state and is tangent to the smooth curved surface of the damping slider. The damping slider is made of engineering plastic, making it wear-resistant and replaceable.

[0008] Furthermore, the cross-section of the damping slider is a closed shape composed of four sequentially connected straight line segments (WQ, QO1, O1M, MN) and two circular arcs (NP, PW). The central angles of the two circular arcs (NP, PW) are opposite in direction, and the two circular arcs (NP, PW) are connected to form a continuous smooth surface. The centers (O4, O3) of the two circular arcs (NP, PW) and the connection point (P) of the two circular arcs are all on the same straight line.

[0009] Furthermore, the positioning stud is connected to the second elastic pin seat through the side hole of the third connecting rod. The second elastic pin seat has two through holes, and the two through holes are respectively engaged with the second spring plunger cylindrical telescopic rod and the cylindrical positioning pin to achieve fixation. The fourth connecting rod is provided with a groove, and the damping slider is embedded in the groove of the fourth connecting rod. The fourth connecting rod and the damping slider are engaged through the cylindrical positioning pin.

[0010] Furthermore, the closed shape is formed by sequentially connecting and closing straight line segments WQ, QO1, O1M, MN, arc NP, and arc PW, wherein arc NP and arc PW are both minor arcs, the central angle of arc NP faces the inside of the damping slider, and the central angle of arc PW faces the outside of the damping slider.

[0011] Furthermore, line segments QO1 and O1M are perpendicular. With O1 as the origin, the directions of line segments QO1 and O1M are the X-axis and Y-axis of the coordinate system, respectively. The function expression for line segment MN is y = 40; the function expression for line segment WQ is y = 4.00x - 133.3; and the function expression for arc NP is (x - 23.3). 2 + (y - 54.2) 2 = 21.82; the functional expression for the arc PW is (x - 33.3). 2 + (y - 27.5) 2 = 7.22.

[0012] Furthermore, the refrigerator six-bar linkage door hinge includes a first four-bar linkage and a second four-bar linkage. The first four-bar linkage consists of a first fixed base, an upper part of a first link, an upper part of a third link, and a fourth link. The second four-bar linkage consists of a lower part of a first link, a second link, a second fixed base, and a third link.

[0013] Furthermore, when the refrigerator door is open, the arc PW of the damping slider contacts and engages with the second spring plunger cylindrical telescopic rod, and the arc PW compresses the second spring plunger cylindrical telescopic rod; when the refrigerator door is closed, the second spring plunger cylindrical telescopic rod remains in its natural state and is tangent to the arc NP of the damping slider.

[0014] Furthermore, the first fixed seat is provided with a first elastic pin seat, and the first elastic pin seat is fixed with a first spring plunger cylindrical telescopic rod. When the refrigerator door is closed, the second fixed seat contacts the first connecting rod to achieve door closing restriction, and the first spring plunger cylindrical telescopic rod is in a natural state and away from the first connecting rod. When the refrigerator door is open, the second fixed seat is away from the first connecting rod, and the first spring plunger cylindrical telescopic rod is in a natural state and away from the first connecting rod.

[0015] During the closing process, there is a damping force between the second spring plunger cylindrical telescopic rod and the damping slider, which enables a buffering function; after the second spring plunger cylindrical telescopic rod and the damping slider reach the critical state, the refrigerator door can continue to close automatically within 30° under the action of inertia.

[0016] When the maximum opening angle of 120° is reached during the opening process, the second fixed seat contacts the first connecting rod to achieve the opening restriction, and the first spring plunger cylindrical telescopic rod gradually returns to its original state from the compressed state, causing the first connecting rod to move inward.

[0017] The beneficial effects of this invention are: (1) The opening and closing buffer function is achieved through the sliding contact between the curved surface of the damping slider and the cylindrical telescopic rod of the second spring plunger. When the refrigerator door is fully closed, the cylindrical telescopic rod of the second spring plunger slides out from the groove of the damping slider when the refrigerator door is opened. The damping slider provides a damping force to the opening of the refrigerator door, making it difficult to pull the refrigerator door open, thus achieving the opening buffer function. When the refrigerator door needs to be closed, the cylindrical telescopic rod of the second spring plunger slides into the groove of the damping slider from the raised curved surface. The raised curved surface of the damping slider provides a corresponding closing damping force to the opening of the refrigerator door, thus achieving the closing buffer function. After the refrigerator door is closed, the cylindrical telescopic rod of the second spring plunger returns to its original shape and is tangent to the groove of the damping slider, thus ensuring that the door is tightly closed.

[0018] (2) The refrigerator door is opened and rebounded by the cylindrical telescopic rod device of the first spring plunger. When the refrigerator door reaches the maximum opening angle, the first connecting rod contacts and interacts with the cylindrical telescopic rod of the first spring plunger, applying a rebound force to the refrigerator door. The refrigerator door can rebound from 120° to 90°, thus realizing the opening and rebound of the refrigerator door.

[0019] (3) A linkage-type refrigerator door hinge device is adopted, which completes the opening and closing functions of the refrigerator door through the movement between six linkages, giving the refrigerator door a larger opening angle. The six linkage consists of two fixed rods and four movable rods. The three movable rods and the first fixed rod form a double rocker mechanism. When the double rocker mechanism reaches the dead point, the opening angle of the refrigerator door reaches its maximum, with a maximum opening angle of 120°. When the refrigerator door is closed, the second spring plunger cylindrical telescopic rod contacts the damping slider. When the critical state is reached, the second spring plunger cylindrical telescopic rod slides into the groove of the damping slider, realizing automatic closing within 30°. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the six-link door hinge structure of the refrigerator of the present invention; Figure 3 This is a schematic diagram of the operation of the damping slider and the second spring plunger cylindrical telescopic rod of the present invention; Figure 4 This is a schematic diagram showing the shape of the damping slider of the present invention in a coordinate system; Figure 5 This is a schematic diagram of the assembly of the six-bar linkage door hinge components of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention in its fully closed state; Figure 7 This is a schematic diagram of the structure in the working state of the present invention; Figure 8 This is a schematic diagram of the structure of the present invention at the maximum opening angle.

[0021] Figure 9 This is a schematic diagram of the structure of the present invention with a door opening angle of 90°.

[0022] In the diagram: 1. Refrigerator six-link door hinge; 11. First fixed seat; 111. First elastic pin seat; 112. First spring plunger cylindrical telescopic rod; 12. Second fixed seat; 13. First connecting rod; 14. Second connecting rod; 15. Third connecting rod; 151. Second elastic pin seat; 152. Second spring plunger cylindrical telescopic rod; 153. Positioning stud; 16. Fourth connecting rod; 161. Damping slider; 17. Cylindrical positioning pin; 18. Stud; 2. Refrigerator; 3. Refrigerator door. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] In this invention, the terms "first" and "second" are used only to distinguish similar components / parts in different positions or with different characteristics, and have no other limiting meaning; "upper" refers to the direction in which each component is away from the ground, and "lower" refers to the direction in which each component is away from the ground.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] like Figures 1-8 As shown, the present invention provides a refrigerator six-bar door hinge with opening and closing buffer function, which is connected between the refrigerator 2 and the refrigerator door 3. The refrigerator six-bar door hinge 1 includes a first fixed seat 11 connected to the refrigerator 2 and a second fixed seat 12 connected to the refrigerator door 3. The first fixed seat 11 is hinged to a first connecting rod 13 and a fourth connecting rod 16 through a cylindrical positioning pin 17. The first connecting rod 13 is also hinged to a second connecting rod 14 and a third connecting rod 15 through a cylindrical positioning pin 17. The second connecting rod 14 and the third connecting rod 15 are both hinged to the second fixed seat 12 through a cylindrical positioning pin 17. The fourth connecting rod 16 is also hinged to the third connecting rod 15 through a cylindrical positioning pin 17. An opening and closing buffer assembly is provided between the third link 15 and the fourth link 16. The opening and closing buffer assembly includes a second spring plunger cylindrical telescopic rod 152 disposed on the third link 15 via a second elastic pin seat 151 and a damping slider 161 disposed on the fourth link 16. The second spring plunger cylindrical telescopic rod 152 abuts against the damping slider 161. A spring is provided inside the second spring plunger cylindrical telescopic rod 152. The damping slider 161 has a continuous smooth curved surface.

[0028] In some embodiments, the positioning stud 153 is connected to the second elastic pin seat 151 through the side hole of the third connecting rod 15. The second elastic pin seat 151 has two through holes, and the two through holes are respectively engaged with the second spring plunger cylindrical telescopic rod 152 and the cylindrical positioning pin 17 to achieve fixation. The fourth connecting rod 16 has a groove, and the damping slider 161 is embedded in the groove of the fourth connecting rod 16. The fourth connecting rod 16 and the damping slider 161 are engaged by the cylindrical positioning pin 17.

[0029] In some embodiments, such as Figure 4 As shown, the cross-section of the damping slider 161 is a closed shape formed by the sequential connection of straight line segments WQ, QO1, O1M, MN, arc NP, and arc PW. Arc NP and arc PW are both minor arcs. The central angle of arc NP faces the inside of the damping slider 161, and the central angle of arc PW faces the outside of the damping slider 161. Arcs NP and PW are connected to form a continuous smooth surface. The center O4 of arc NP, the center O3 of arc PW, and the connection point P of the two arcs are all on the same straight line.

[0030] Furthermore, line segments QO1 and O1M are perpendicular. With O1 as the origin, the directions of line segments QO1 and O1M are the X-axis and Y-axis of the coordinate system, respectively. The function expression for line segment MN is y = 40; the function expression for line segment WQ is y = 4.00x - 133.3; and the function expression for arc NP is (x - 23.3). 2 + (y - 54.2) 2 = 21.82; the functional expression for the arc PW is (x - 33.3). 2 + (y - 27.5) 2 = 7.22.

[0031] In some embodiments, the refrigerator six-bar door hinge 1 includes a first four-bar linkage and a second four-bar linkage. The first four-bar linkage is composed of a first fixed base 11, the upper part of the first link 13, the upper part of the third link 15, and the fourth link 16. The second four-bar linkage is composed of the lower part of the first link 13, the second link 14, the second fixed base 12, and the third link 15.

[0032] like Figure 5 As shown, the first fixing base 11 has A , B It has two locating pin holes and four threaded holes on the side. The second fixing base 12 has... E , G There are two locating pin holes and two threaded holes on the side. The first connecting rod 13 has... A , D , F Two locating pin holes. The second connecting rod 14 has... F , G Two locating pin holes. The third connecting rod 15 has... D , C , E There are three locating pin holes and one locating screw hole on the side wall. The fourth connecting rod 16 has... C , B Two locating pin holes.

[0033] To obtain the trajectory formula of the first four-bar linkage, projecting the vector equations onto a rectangular coordinate system yields the basic trajectory equations:

[0034]

[0035] in, l AB For the frame length, l CD The length of the link. l BC , l DA This refers to the length of the connecting rod. for DA The initial angle of the rod, for BC The initial angle of the rod, for DA The angle of motion of the rod, for BC The angle of motion of the rod, for CD The angle between the rod and the direction parallel to the refrigerator.

[0036]

[0037] in, , , , , , .

[0038] After confirming the motion trajectory of the first four-bar linkage, the second four-bar linkage can be calculated using the same method. By projecting the vector equations onto a Cartesian coordinate system, the motion trajectory still conforms to the following formula:

[0039] in, for DE The initial angle of the rod, for GF The initial angle of the rod, for DE The angle of motion of the rod, for GF The angle of motion of the rod, To and DF The angle between the parallel rods , , , , , . l DF For the frame length, l EG The length of the link. l DE , l GF Let be the length of the connecting rod. The motion trajectory of the hinge can be determined using the formula above.

[0040] Furthermore, when the refrigerator door 3 is in the open state, the arc PW of the damping slider 161 contacts and engages with the second spring plunger cylindrical telescopic rod 152, and the arc PW compresses the second spring plunger cylindrical telescopic rod 152; when the refrigerator door 3 is in the closed state, the second spring plunger cylindrical telescopic rod 152 remains in its natural state and is tangent to the arc NP of the damping slider 161.

[0041] Specifically, during the closing process of the refrigerator door, the outer edge of the second spring plunger cylindrical telescopic rod 152 gradually slides from the straight segment WQ to the straight segment PW. Since the entire damping slider 161 rotates around the center O2, the distance between the straight segment PW and the center O2 is greater than the distance between the straight segment WQ and the center O2. Therefore, when the second spring plunger cylindrical telescopic rod 152 slides to the straight segment PW, the spring plunger is subjected to increasing pressure, thereby realizing the door closing buffer function.

[0042] After the refrigerator door is completely closed, the outer edge of the second spring plunger cylindrical telescopic rod 152 slides from the straight segment PW into the arc segment NP. Since the distance from the straight segment NP to O2 is less than the distance from the straight segment PW to O2, the pressure on the spring plunger of the second spring plunger cylindrical telescopic rod 152 continuously decreases. As the outer edge of the spring plunger continuously approaches point N, when the refrigerator door is completely closed, the spring plunger springs back to its natural position and is no longer under pressure.

[0043] During the door opening process, the outer edge of the second spring plunger cylindrical telescopic rod 152 slides from the arc segment NP to the arc segment PW. During this process, the spring plunger is subjected to a pressure that increases with the opening angle, preventing the refrigerator door from being easily opened. When the refrigerator door is opened to approximately 30°, the second spring plunger cylindrical telescopic rod 152 slides from the arc segment PW to the straight segment WQ, and the pressure on the spring plunger rapidly decreases. At this point, the door is no longer subject to damping force and can be opened normally.

[0044] Furthermore, the first fixed seat 11 and the first elastic pin seat 111 are fixed by studs 18. The first elastic pin seat 111 is fixed with a first spring plunger cylindrical telescopic rod 112. When the refrigerator door 3 is closed, the second fixed seat 12 contacts the first connecting rod 13 to achieve door closing restriction, and the first spring plunger cylindrical telescopic rod 112 is in a natural state and away from the first connecting rod 13. When the refrigerator door 3 is open, the second fixed seat 12 is away from the first connecting rod 13, and the first spring plunger cylindrical telescopic rod 112 is in a natural state and away from the first connecting rod 13.

[0045] During the closing process, there is a damping force between the second spring plunger cylindrical telescopic rod 152 and the damping slider 161, which enables a buffering function; after the second spring plunger cylindrical telescopic rod 152 and the damping slider 152 reach the critical state, the refrigerator door 3 can continue to close automatically within 30° under the inertia of the first connecting rod 13.

[0046] When the maximum opening angle of 120° is reached during the opening process, the second fixed seat 12 contacts the first connecting rod 13 to achieve the opening restriction, and the first spring plunger cylindrical telescopic rod 112 gradually returns to its original state from the compressed state, causing the first connecting rod 13 to move inward.

[0047] Example 1 This invention proposes an application method for a six-bar door hinge for a refrigerator with an opening and closing buffer function, which includes the following steps: Step 1: When the six-bar door hinge 1 is in the closed state, the second fixed seat 12 is in contact with the first connecting rod 13, thus restricting the door closure; the second spring plunger cylindrical telescopic rod 152 is in its original state and tangent to the damping slider 161. The first spring plunger cylindrical telescopic rod 112 is in its original state, away from the first connecting rod 13.

[0048] Step 2: Rotating the refrigerator door 3 will cause the second fixed seat 12 to rotate, moving the second fixed seat 12 away from the first connecting rod 13; the second spring plunger cylindrical telescopic rod 152 will collide with the damping slider 161; the second spring plunger cylindrical telescopic rod 152 will slowly change from its original state to a compressed state, and when it reaches the critical state, the second spring plunger cylindrical telescopic rod 152 will slide out from the damping slider 161, and the second spring plunger cylindrical telescopic rod 152 will slowly change from the compressed state to its original state, thus realizing the door opening buffer function.

[0049] Step 3: Continue rotating the refrigerator door 3, which will further rotate the second fixed seat 12. When the door opening angle is 90°, the first spring plunger cylindrical telescopic rod 112 is in its original state and just in contact with the first connecting rod 13. When the door opening angle exceeds 90°, the first spring plunger cylindrical telescopic rod 112 slowly becomes compressed. When the door opening angle is 120°, the second fixed seat 12 contacts the first connecting rod 13 again, achieving door opening restriction; if the force applied to the refrigerator door 3 is stopped, the first spring plunger cylindrical telescopic rod 112 will return to its original state, and the door opening angle of the refrigerator door 3 will return to 90°, thus achieving door opening rebound.

[0050] Step 4: Closing the refrigerator door 3 will cause the second fixed base 12 to rotate. As the opening angle decreases, the second spring plunger cylindrical telescopic rod 152 contacts the damping slider 161 again, and the second spring plunger cylindrical telescopic rod 152 slowly changes from its original state to a compressed state, realizing the function of door closing buffer. When the critical state is reached, the second spring plunger cylindrical telescopic rod 152 slides into the damping slider 161, thereby realizing automatic door closing when the opening angle is 30°, and the second spring plunger cylindrical telescopic rod 152 slowly changes from the compressed state to its original state.

[0051] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention.

[0052] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A refrigerator six-bar door hinge with opening and closing buffer function, connected between a refrigerator (2) and a refrigerator door (3), the refrigerator six-bar door hinge (1) includes a first fixed seat (11) connecting the refrigerator (2) and a second fixed seat (12) connecting the refrigerator door (3), the first fixed seat (11) is hinged to a first connecting rod (13) and a fourth connecting rod (16), the first connecting rod (13) is also hinged to a second connecting rod (14) and a third connecting rod (15), the second connecting rod (14) and the third connecting rod (15) are both hinged to the second fixed seat (12), and the fourth connecting rod (16) is also hinged to the third connecting rod (15); characterized in that, An opening and closing buffer assembly is provided between the third link (15) and the fourth link (16). The opening and closing buffer assembly includes a second spring plunger cylindrical telescopic rod (152) set on the third link (15) through a second elastic pin seat (151) and a damping slider (161) set on the fourth link (16). The second spring plunger cylindrical telescopic rod (152) abuts against the damping slider (161). A spring is provided inside the second spring plunger cylindrical telescopic rod (152). The damping slider (161) has a continuous smooth curved surface. When the refrigerator door (3) is in the open state, the smooth curved surface of the damping slider (161) contacts and cooperates with the second spring plunger cylindrical telescopic rod (152) and compresses the second spring plunger cylindrical telescopic rod (152). When the refrigerator door (3) is in the closed state, the second spring plunger cylindrical telescopic rod (152) maintains its natural state and is tangent to the smooth curved surface of the damping slider (161).

2. The refrigerator six-link door hinge according to claim 1, characterized in that, The cross-section of the damping slider (161) is a closed shape composed of four sequentially connected straight line segments (WQ, QO1, O1M, MN) and two circular arcs (NP, PW). The central angles of the two circular arcs (NP, PW) are opposite and the two circular arcs (NP, PW) are connected to form a continuous smooth surface. The centers (O4, O3) of the two circular arcs (NP, PW) and the connection point (P) of the two circular arcs are all on the same straight line.

3. The refrigerator six-link door hinge according to claim 2, characterized in that, The positioning stud (153) is connected to the second elastic pin seat (151) through the side hole of the third connecting rod (15). The second elastic pin seat (151) has two through holes, and the two through holes are respectively engaged with the second spring plunger cylindrical telescopic rod (152) and the cylindrical positioning pin (17) to achieve fixation. The fourth connecting rod (16) is provided with a groove, and the damping slider (161) is embedded in the groove of the fourth connecting rod (16). The fourth connecting rod (16) and the damping slider (161) are engaged through the cylindrical positioning pin (17).

4. The refrigerator six-link door hinge according to claim 3, characterized in that, The closed shape is formed by sequentially connecting and closing straight line segments WQ, QO1, O1M, MN, arc NP, and arc PW. Arc NP and arc PW are both minor arcs. The central angle of arc NP faces the inside of the damping slider (161), and the central angle of arc PW faces the outside of the damping slider (161).

5. The refrigerator six-link door hinge according to claim 4, characterized in that, The refrigerator six-bar linkage (1) includes a first four-bar linkage and a second four-bar linkage. The first four-bar linkage is composed of a first fixed base (11), the upper part of the first link (13), the upper part of the third link (15), and the fourth link (16). The second four-bar linkage is composed of the lower part of the first link (13), the second link (14), the second fixed base (12), and the third link (15).

6. The refrigerator six-link door hinge according to claim 5, characterized in that, When the refrigerator door (3) is in the open state, the arc PW of the damping slider (161) contacts and engages with the second spring plunger cylindrical telescopic rod (152), and the arc PW compresses the second spring plunger cylindrical telescopic rod (152); when the refrigerator door (3) is in the closed state, the second spring plunger cylindrical telescopic rod (152) remains in its natural state and is tangent to the arc NP of the damping slider (161).

7. The refrigerator six-link door hinge according to claim 6, characterized in that, The first fixed seat (11) is provided with a first elastic pin seat (111), and the first elastic pin seat (111) is fixed with a first spring plunger cylindrical telescopic rod (112). When the refrigerator door (3) is closed, the second fixed seat (12) contacts the first connecting rod (13) to achieve door closing restriction, and the first spring plunger cylindrical telescopic rod (112) is in a natural state and away from the first connecting rod (13). When the refrigerator door (3) is open, the second fixed seat (12) is away from the first connecting rod (13), and the first spring plunger cylindrical telescopic rod (112) is in a natural state and away from the first connecting rod (13).

8. The refrigerator six-link door hinge according to claim 7, characterized in that, During the closing process, there is a damping force between the second spring plunger cylindrical telescopic rod (152) and the damping slider (161), which enables the buffering function; after the second spring plunger cylindrical telescopic rod (152) and the damping slider (152) reach the critical state, the refrigerator door (3) can continue to automatically close within 30° under the inertia of the first connecting rod (13).

9. The refrigerator six-link door hinge according to claim 7, characterized in that, When the maximum opening angle of 120° is reached during the opening process, the second fixed seat (12) comes into contact with the first connecting rod (13) to achieve the opening restriction. The first spring plunger cylindrical telescopic rod (112) gradually returns to its original state from the compressed state, causing the first connecting rod (13) to move inward.

10. The application method of the refrigerator six-bar door hinge according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: When the six-bar door hinge (1) is in the closed state, the second fixed seat (12) contacts the first connecting rod (13) to achieve door closing restriction; the second spring plunger cylindrical telescopic rod (152) is in its original state and tangent to the damping slider (161); the first spring plunger cylindrical telescopic rod (112) is in its original state and away from the first connecting rod (13). Step 2: Rotate the refrigerator door (3), thereby driving the second fixed seat (12) to rotate, and the second fixed seat (12) moves away from the first connecting rod (13); the second spring plunger cylindrical telescopic rod (152) collides with the damping slider (161); the second spring plunger cylindrical telescopic rod (152) slowly changes from its original state to a compressed state, and when it reaches the critical state, the second spring plunger cylindrical telescopic rod (152) slides out from the damping slider (161), and the second spring plunger cylindrical telescopic rod (152) slowly changes from the compressed state to its original state, realizing the function of door opening buffer; Step 3: Continue rotating the refrigerator door (3), which will continue to rotate the second fixed seat (12). When the door opening angle is 90°, the first spring plunger cylindrical telescopic rod (112) is in its original state and just in contact with the first connecting rod (13). When the door opening angle exceeds 90°, the first spring plunger cylindrical telescopic rod (112) slowly becomes compressed. When the door opening angle is 120°, the second fixed seat (12) contacts the first connecting rod (13) again, realizing the door opening restriction; if the force applied to the refrigerator door (3) is stopped, the first spring plunger cylindrical telescopic rod (112) will return to its original state, and the door opening angle of the refrigerator door (3) will return to 90°, thereby realizing the door opening rebound; Step 4: Closing the refrigerator door (3) will cause the second fixed seat (12) to rotate; as the opening angle decreases, the second spring plunger cylindrical telescopic rod (152) will collide with the damping slider (161) again; the second spring plunger cylindrical telescopic rod (152) will slowly change from its original state to a compressed state, realizing the function of door closing buffer; when the critical state is reached, the second spring plunger cylindrical telescopic rod (152) will slide into the damping slider (161), thereby realizing automatic door closing when the opening angle is 30°, and the second spring plunger cylindrical telescopic rod (152) will slowly change from a compressed state to its original state.

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