Opening / closing hinge

Abstract

The present utility model relates to the field of hinges, and provides an opening / closing hinge, comprising a door panel fixing base fixed to a door, a cabinet fixing base fixed to a cabinet, a crank arm, a front support, a rear support, a force arm, a self-locking spring assembly and a connecting rod. Compared with the prior art, the opening / closing hinge has the door panel fixing base installed on the door and the cabinet fixing base installed on the cabinet, and the door panel fixing base is separated from the cabinet fixing base by means of expansion of the crank arm, the front support, the rear support, the force arm, and the connecting rod, so that the door and the cabinet are separated to form a gap, and the door can be flexibly opened; the door opening angle ranges from -2 to 115 degrees, and items can be taken and placed conveniently; when in a folded and contracted state, the arms are received between the door panel fixing base and the cabinet fixing base, without affecting door closing; a roller in the self-locking spring assembly makes contact with a connecting rod cam and a placement groove, so that opening / closing of the whole door is labor-saving and easy, and the door can be automatically closed in a certain angle range.

Description

An opening and closing hinge Technical Field

[0001] The utility model relates to the field of hinges, in particular to an opening and closing hinge. Background Art

[0002] Existing refrigerators, freezers, and various types of storage cabinets mostly use a coaxial hinge method to connect the door and cabinet body. However, due to the thickness of the door body, this hinge method causes the door body to press against the cabinet body during opening, making it difficult to open flexibly and inconvenient to take items in and out. In addition, when closing the door body, it cannot automatically close at a small angle and the entire closing process requires manual pushing, which provides a poor user experience and poor sealing between the cabinet body and door of refrigerators, freezers, and various types of storage cabinets, especially reducing the overall performance of refrigerators and freezers. Technical Solutions

[0003] In response to the above problems, the present invention provides an opening and closing hinge, which is more labor-saving during the door closing process. Within a certain closing angle range, the door body can be automatically sucked together, which is convenient to use and brings a comfortable experience to users.

[0004] The technical solution adopted by this utility model is:

[0005] A hinge for opening and closing, comprising a door panel fixing seat fixed on the door body and a cabinet fixing seat fixed on the cabinet body, and also comprising a rocker arm, a front bracket, a rear bracket, a force arm, a self-locking spring assembly and a connecting rod, wherein the cabinet fixing seat is hinged to one end of the rocker arm through a first hinge shaft, the other end of the rocker arm is hinged to one end of the front bracket through a second hinge shaft, the other end of the front bracket is hinged to one end of the door panel fixing seat through a third hinge shaft, the other end of the door panel fixing seat is hinged to one end of the rear bracket through a fourth hinge shaft, the other end of the rear bracket is hinged to the rocker arm through a fifth hinge shaft, and the fifth hinge shaft is located between the first hinge shaft and the second hinge shaft; the cabinet fixing seat is also hinged to one end of the force arm through a sixth hinge shaft, and the other end of the force arm is hinged to the rear bracket through a seventh hinge shaft The seventh hinge shaft is hinged between the fourth hinge shaft and the fifth hinge shaft; the self-locking spring assembly is in the front bracket, and the other end of the self-locking spring assembly is hinged to the other end of the rocker arm through the second hinge shaft, and the eighth hinge shaft is between the second hinge shaft and the third hinge shaft; the connecting rod is in the door panel fixing seat, one end of the connecting rod is hinged in the rear bracket through the fourth hinge shaft, and the other end of the connecting rod is hinged in the front bracket through the third hinge shaft; the self-locking spring assembly includes a roller for rolling along the side wall of the connecting rod when opening and closing, and the roller is sleeved on the eighth hinge shaft, and an inclined groove cooperating with the eighth hinge shaft is provided on the side wall of the front bracket, and a cam cooperating with the roller is provided on the connecting rod, and one end of the connecting rod is provided with a placement groove on the front side of the cam for placing the roller when the door panel fixing seat is closed.

[0006] Preferably, the self-locking spring assembly includes an axial spring seat, a bushing spring seat cooperating with the axial spring seat, and a spring located between the axial spring seat and the bushing spring seat. The axial spring seat is hinged to the front bracket through an eighth hinge shaft, the bushing spring seat is hinged to the rocker arm through a second hinge shaft, an installation groove is provided on the axial spring seat, and the roller is installed in the installation groove through the eighth hinge shaft.

[0007] More preferably, the cabinet body fixing seat is provided with a lower containing groove for accommodating the rocker arm in the folded state, and one end of the rocker arm extends into the lower containing groove and is hinged to the side wall of the lower containing groove through the first hinge shaft; the door panel fixing seat is provided with an upper containing groove for accommodating the front bracket and the rear bracket in the folded state, the connecting rod is in the upper containing groove, and the other end of the front bracket extends into the upper containing groove and is hinged to the side wall of the upper containing groove through the third hinge shaft.

[0008] More preferably, the rocker arm is provided with a first groove for accommodating the front bracket, the rear bracket and the folded state force arm, one end of the front bracket extends into the first groove and is hinged to the side wall of the first groove through the second hinge shaft, and the other end of the rear bracket extends into the first groove and is hinged to the side wall of the first groove through the fifth hinge shaft; the front bracket is provided with a second groove for accommodating a self-locking spring assembly, and the strip groove is arranged on the side wall of the second groove.

[0009] More preferably, the rear bracket is provided with a connecting groove for accommodating the connecting rod in the folded state.

[0010] Preferably, a pin hole cooperating with the eighth pin is formed at one end of the connecting rod, and the cam is divided into a first arc segment and a second arc segment connected in sequence, and the first arc segment and the second arc segment have a smooth transition, the first arc segment is a circular arc surface centered on the pin hole, one side of the second arc segment is a convex surface connected to the first arc segment, and the other side of the second arc segment is a concave surface connected to the placement groove, and the second arc segment has a cam vertex, the cam vertex is farthest from the center of the pin hole, and the front end of the other side of the second arc segment is the shortest distance from the center of the pin hole.

[0011] More preferably, the connecting rod is provided with a clearance groove located at the rear side of the cam.

[0012] Preferably, a track groove cooperating with the eighth hinge shaft is provided on the side wall of the door body fixing seat.

[0013] Preferably, one end of the cabinet fixing seat is further connected to a baffle for preventing the rocker arm from rotating in the reverse direction.

[0014] More preferably, the opening angle range between the door panel fixing seat and the cabinet fixing seat is -2 to 115 degrees. Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the present invention are: the present invention provides an opening and closing hinge, in which the door panel fixing seat is installed on the door body, and the cabinet fixing seat is installed on the cabinet body, and the door panel fixing seat and the cabinet fixing seat are separated by the expansion of the rocker arm, the front bracket, the rear bracket, the force arm and the connecting rod, and the roller in the self-locking spring assembly contacts the positioning groove and the cam groove on the connecting rod, so that the door body and the cabinet body are separated with a gap, the door body is flexibly opened, and the door body opening angle range is -2~115 degrees, which is convenient for taking and placing items; in the folded and retracted state, each arm is stored between the door panel fixing seat and the cabinet fixing seat, and does not affect the closing of the door body; when closing the door, within a certain closing angle range, the door body can be automatically sucked in, giving the user a comfortable experience; and when opening the door, a certain resistance needs to be overcome to open the door body, and the sealing between the door body and the cabinet body is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of an opening and closing hinge provided by the present invention when opened 115 degrees;

[0017] FIG2 is a diagram showing the internal structure of an opening and closing hinge provided by the present invention when the hinge is opened 115 degrees.

[0018] FIG3 is a cross-sectional view of an opening and closing hinge provided by the present invention when opened 115 degrees;

[0019] FIG4 is a schematic diagram of an opening and closing hinge provided by the present invention when opened 60 degrees;

[0020] FIG5 is a cross-sectional view of an opening and closing hinge provided by the present invention when opened 60 degrees;

[0021] FIG6 is a diagram showing the internal structure of an opening and closing hinge provided by the present invention when the hinge is opened 30 degrees;

[0022] FIG7 is a cross-sectional view of an opening and closing hinge provided by the present invention when opened 30 degrees;

[0023] FIG8 is a diagram showing the internal structure of an opening and closing hinge provided by the present invention when the hinge is opened 25 degrees;

[0024] FIG9 is a cross-sectional view of an opening and closing hinge provided by the present invention when opened 25 degrees;

[0025] FIG10 is a diagram showing the internal structure of an opening and closing hinge provided by the present invention when the hinge is opened 15 degrees;

[0026] FIG11 is a cross-sectional view of an opening and closing hinge provided by the present invention when opened 15 degrees;

[0027] FIG12 is a schematic diagram of an opening and closing hinge provided by the present invention at a closing position of -2 degrees;

[0028] FIG13 is a diagram showing the internal structure of an opening and closing hinge provided by the present invention at a closed position of -2 degrees;

[0029] FIG14 is a cross-sectional view of an opening and closing hinge provided by the present invention at a closed angle of -2 degrees;

[0030] FIG15 is an exploded view of an opening and closing hinge provided by the present invention;

[0031] FIG16 is a schematic diagram of a connecting rod in an opening and closing hinge provided by the present invention;

[0032] FIG17 is an exploded view of a self-locking spring assembly in an opening and closing hinge provided by the present invention;

[0033] FIG18 is a schematic diagram of an opening and closing hinge provided by the present invention installed between a door body and a cabinet body. Best Mode for Carrying Out the Invention

[0034] The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0035] Figures 1 to 18 are preferred embodiments of an opening and closing hinge provided by the present invention. As shown in Figures 1 to 15, the hinge includes a door panel fixing seat 10 fixed on the door body 100, a cabinet fixing seat 20 fixed on the cabinet body 200, a rocker arm 30, a front bracket 40, a rear bracket 50, a lever arm 60, a self-locking spring assembly 70 and a connecting rod 80. The cabinet fixing seat 20 is hinged to one end of the rocker arm 30 through a first hinge shaft 101, the other end of the rocker arm is hinged to one end of the front bracket 40 through a second hinge shaft 102, the other end of the front bracket 40 is hinged to one end of the door panel fixing seat 10 through a third hinge shaft 103, the other end of the door panel fixing seat 10 is hinged to one end of the rear bracket 50 through a fourth hinge shaft 104, the other end of the rear bracket 50 is hinged to the rocker arm 30 through a fifth hinge shaft 105, and the fifth hinge shaft 106 is hinged to the rocker arm 30. The hinge shaft 105 is located between the first hinge shaft 101 and the second hinge shaft 102; the cabinet fixing seat 20 is also hinged to one end of the lever arm 60 through the sixth hinge shaft 106, and the other end of the lever arm 60 is hinged to the rear bracket 50 through the seventh hinge shaft 107, and the seventh hinge shaft 107 is located between the fourth hinge shaft 104 and the fifth hinge shaft 105; the self-locking spring assembly 70 is located in the front bracket 40, and the other end of the self-locking spring assembly 70 is hinged to the other end of the rocker arm 30 through the second hinge shaft 102, and the eighth hinge shaft 108 is located between the second hinge shaft 102 and the third hinge shaft 103; the connecting rod 80 is located in the door panel fixing seat 10, and one end of the connecting rod 80 is hinged to the rear bracket 50 through the fourth hinge shaft 104, and the other end of the connecting rod 80 is hinged to the rear bracket 50 through the third hinge shaft The shaft 103 is hinged in the front bracket 40; the self-locking spring assembly 70 includes a roller 704 for rolling along the side wall of the connecting rod when opening and closing, and the roller 704 is sleeved on the eighth hinge shaft 108. The side wall of the front bracket 40 is provided with an inclined groove 42 that cooperates with the eighth hinge shaft. A cam 81 that cooperates with the roller 704 is formed at one end of the connecting rod 80, and a placement groove 82 is formed on the front side of the cam for placing the roller 704 when the door panel fixing seat 10 is closed. The opening and closing angle between the door panel fixing seat 10 and the cabinet fixing seat 20 is -2~115 degrees. The door panel fixing seat 10 is separated from the cabinet fixing seat 20 by the expansion of the rocker arm 30, the front bracket 40, the rear bracket 50 and the force arm 60, so that the door body and the cabinet body are separated with a gap. The door body opens flexibly, keeping the door body connected to the door panel fixing seat 10 in an open state, and the door body opening angle range is -2~115 degrees, which is convenient for taking and placing items; and when folding and retracting, each arm is stored between the door panel fixing seat 10 and the cabinet fixing seat 20, without affecting the closing of the door body, keeping the door body connected to the door panel fixing seat 10 in a closed state; and, during the opening and closing process of the door body, the roller 704 in the self-locking spring assembly 70 rolls along the cam 81 on the connecting rod 80. When the door body is at 0 degrees, the roller 704 is at the front end of the cam 81, and when the door body is at 115 degrees, the roller 704 moves to the end of the cam 81. The entire door body opening and closing process is labor-saving and easy, the door body is tightly closed, and the angle is stable when open.The connecting rod is also provided with an avoidance groove 83 at the rear side of the cam and a placement groove 82 at the front side of the cam, which avoids interference with the movement of the roller 704 when the roller 704 moves to the front end and the end of the cam.

[0036] As shown in Figure 17, the self-locking spring assembly 70 includes an axial spring seat 701, a bushing spring seat 702 that cooperates with the axial spring seat 701, and a spring 703 located between the axial spring seat 701 and the bushing spring seat 702. The axial spring seat 701 is hinged to the front bracket 40 through the eighth hinge shaft 108, and the bushing spring seat 702 is hinged to the rocker arm 30 through the second hinge shaft 102. An installation groove 7011 is provided on the axial spring seat 701, and the roller 704 is installed in the installation groove 7011 through the eighth hinge shaft 108. The two ends of the eighth pin shaft 108 cooperate with the inclined groove 42 on the side wall of the front bracket 40.

[0037] A pin hole 801 is formed at one end of the connecting rod 80 for cooperating with the eighth pin shaft 108. The cam 81 is divided into a first arc segment 8101 and a second arc segment 8102 connected in sequence. There is a smooth transition between the first arc segment 8101 and the second arc segment 8102. The first arc segment 8101 is a circular arc surface centered on the pin hole 801. One side of the second arc segment 8102 is a convex surface connected to the first arc segment 8101, and the other side of the second arc segment 8102 is a concave surface connected to the placement groove 82. The second arc segment 8102 has a cam vertex, which is farthest from the center of the pin hole 801, and the front end of the other side of the second arc segment 8102 is the shortest distance from the center of the pin hole 801. When the door panel fixing seat 10 is opened 115 degrees, the roller 704 moves to the end of the first arc segment 8101, and the angle formed by the plane formed by the center line of the roller 704 and the center line of the pin shaft hole 801 and the plane of the door panel is 38 degrees; when the door panel fixing seat 10 is opened 30 degrees, the roller 704 moves to the connection position on one side of the first arc segment 8101 and the second arc segment 8102, and the angle formed by the plane formed by the center line of the roller 704 and the center line of the pin shaft hole 801 and the plane of the door panel is 110 degrees; when the door panel fixing seat 10 is opened 25 degrees, the roller 704 moves to the end of the first arc segment 8101, and the angle formed by the plane formed by the center line of the roller 704 and the center line of the pin shaft hole 801 and the plane of the door panel is 38 degrees; when the door panel fixing seat 10 is opened 30 degrees, the roller 704 moves to the connection position on one side of the first arc segment 8101 and the second arc segment 8102, and the angle formed by the plane formed by the center line of the roller 704 and the center line of the pin shaft hole 801 and the plane of the door panel is 110 degrees. The wheel 704 moves to the highest point (cam vertex) in the second arc segment 8102, which is farthest from the center of the pin shaft hole 801. The angle formed by the plane formed by the center line of the roller 704 and the center line of the pin shaft hole 801 and the plane of the door panel is 116 degrees; when the door panel fixing seat 10 is closed to -2 degrees, the roller 704 rolls along the concave surface on the other side of the second arc segment 8102 and the side wall of the placement groove 82 to the bottom of the placement groove 82. The angle formed by the plane formed by the center line of the roller 704 and the center line of the pin shaft hole 801 and the plane of the door panel is 154 degrees.

[0038] When the maximum angle is 115 degrees, the roller 704 is at the end of the first arc segment 8101 in the cam 81. When the closing angle changes from 115 degrees to 30 degrees, the roller 704 rolls tangentially with the arc surface of the first arc segment 8101 in the cam 81, and does not squeeze the spring 703. When the closing angle changes from 30 degrees to 25 degrees, the roller 704 contacts the convex surface of the second arc segment 8102 in the cam 81. As the angle gradually decreases, the roller 704 rolls with the shaft. The spring seat 701 begins to squeeze the spring 703, storing energy until the roller 704 climbs to the top of the cam 81; when the door closing angle changes from 25 degrees to 0 degrees, the roller 704 passes the top of the cam, and the roller 704 rolls along the concave surface of the second arc segment 8102 and the side wall of the placement groove 82, and begins to go downhill. The spring 703 releases energy to achieve automatic door closing. In this way, when the door body is closed to the range of -2 degrees to 25 degrees, the door body automatically closes after the user releases his hand, achieving automatic door closing.

[0039] The cabinet fixing seat 20 is provided with a lower receiving groove 21 for accommodating the rocker arm 30 in the folded state, and one end of the rocker arm 30 extends into the lower receiving groove 21 and is hinged to the side wall of the lower receiving groove 21 through the first hinge shaft 101; the door panel fixing seat 10 is provided with an upper receiving groove 11 for accommodating the front bracket 40 and the rear bracket 50 in the folded state, and the other end of the front bracket 40 extends into the upper receiving groove 11 and is hinged to the side wall of the upper receiving groove 11 through the third hinge shaft 103, and the connecting rod 80 is completely in the upper receiving groove 11, and the two ends of the connecting rod 80 and the two ends of the door panel fixing seat 10 are respectively hinged by the third hinge shaft 103 and the fourth hinge shaft 104, so the connecting rod 80 moves synchronously with the door panel fixing seat 10; when hinged, the rocker arm One end of the front bracket 40 extends into the lower receiving groove 21, and the other end of the front bracket 40 and one end of the rear bracket 50 extend into the upper receiving groove 11. When folding, the rocker arm 30 rotates around the first hinge shaft 101 toward the lower receiving groove 21, and the rocker arm 30 is completely accommodated in the lower receiving groove 21 of the cabinet fixing base 20; the front bracket 40 rotates around the second hinge shaft 102 toward the direction of the self-locking spring assembly 70, and the rear bracket 50 rotates around the fifth hinge shaft 105 toward the direction of the force arm 60, simultaneously driving the connecting rod 80 connected to the front bracket 40 and the rear bracket 50 to rotate toward the direction of the cabinet fixing base 20. The connecting rod 80, the other end of the front bracket 40, and one end of the rear bracket 50 are all accommodated in the upper receiving groove 11. One end of the cabinet fixing base 20 is also connected to a baffle 22 for preventing the rocker arm from rotating in the opposite direction, thereby preventing the rocker arm 30 from rotating in the opposite direction. The side wall of the door body fixing seat 10 is provided with a track groove 12 that cooperates with the eighth hinge shaft 108 . When the roller 704 contacts the placement groove 82 and the cam 81 on the connecting rod 80 , it drives the eighth hinge shaft 108 to move along the track groove 12 .

[0040] The rocker arm 30 is provided with a first receiving groove 31 for accommodating the front bracket 40, the rear bracket 50 and the folded state lever 60, one end of the front bracket 40 extends into the first receiving groove 31 and is hinged to the side wall of the first receiving groove 31 through the second hinge shaft 102, and the other end of the rear bracket 50 extends into the first receiving groove 31 and is hinged to the side wall of the first receiving groove 11 through the fifth hinge shaft 105; the front bracket 40 is provided with a second receiving groove 41 for accommodating the self-locking spring assembly 70, and the inclined groove 42 is provided on the side wall of the second receiving groove 41. When folding, the front bracket 40 rotates around the second hinge shaft 102 toward the direction close to the lever 70 under the action of the door panel fixing seat 10, the rear bracket 50 rotates around the fifth hinge shaft 105 toward the direction close to the lever 60, and the lever 60 rotates around the sixth hinge shaft 106 toward the direction close to the rocker arm 30; when folding is completed, the other end of the rear bracket 50 is stored in the first receiving groove 31, and the other end of the lever 60 is also stored in the first receiving groove 31. The inclined groove 42 cooperates with the eighth hinge shaft 108 to play the role of compressing the spring 703 .

[0041] The rear bracket 50 is provided with a connecting groove 51 for accommodating the folded connecting rod 80. The folded front bracket 40 is positioned on the rear bracket 50. The folded connecting rod 80 is positioned in a nearly horizontal position within the connecting groove 51. One end of the connecting rod 80 is hingedly connected to the rear bracket 50 via a fourth pin 104, and the other end of the connecting rod 80 is hingedly connected to the front bracket 40 via a third pin 103. The rear bracket 50 includes two side panels, with the connecting groove 51 formed therebetween. The same side of the two side panels are connected by a first connecting rod and a second connecting rod. A rear opening is formed between the two connecting rods, allowing the other end of the force supply arm 60 to extend into the rear bracket 50 and be hingedly connected via a seventh hinge 107.

[0042] One side of the door panel fixing seat 10 is provided with a first mounting plate 13 for mounting on the door body, and is mounted on the door body through the first mounting plate 13; one side of the cabinet fixing seat 20 is provided with a second mounting plate 23 for mounting on one side of the cabinet body, and is mounted on the cabinet body through the second mounting plate 23.

[0043] Figures 1 to 3 are schematic diagrams of the hinge when the door is open 115 degrees; Figures 4 and 5 are schematic diagrams of the hinge when the door is open 60 degrees; and Figures 6 and 7 are schematic diagrams of the hinge when the door is open 30 degrees. As shown in Figure 2, the end of the inclined slot 42 closest to the rocker arm 30 is designated as end A, and the other end of the inclined slot 42 closest to the connecting rod 80 is designated as end B. When the door body is opened from -2 degrees to 115 degrees, the specific movement process of the opening and closing hinge is as follows: the other end of the door panel fixing seat 10 rotates around the fourth hinge shaft 104, and the front bracket 40 and the rear bracket 50 drive the rocker arm 30 and the force arm 70 to rotate away from the cabinet fixing seat 20; 1) As shown in Figures 12 to 14, when the door panel fixing seat 10 is at -2 degrees, the roller 704 is in contact with the bottom of the placement groove 82, and the eighth pin 108 is at the B end of the inclined groove 42; 2) As shown in Figures 8 to 14, when the door panel fixing seat 10 moves from -2 degrees to 25 degrees, the roller The wheel 704 climbs along the side wall of the groove 82 and the second arc segment 8102, and rolls from the concave surface on the other side of the groove 82 and the second arc segment 8102 to the cam vertex of the cam 81. During the climbing process, the roller 704 starts to squeeze the spring 703 with the shaft spring seat 701 to store energy. Therefore, during the door opening process, it is necessary to overcome the resistance of the roller rising, and a certain amount of force is required to open the door body; 3) As shown in Figures 8 and 9, when the door panel fixing seat 10 is at 25 degrees, the roller 704 climbs to the second arc segment 81 on the cam 81. 02 is the highest point (cam vertex), the squeeze of the shaft spring seat 701 on the spring 703 reaches the maximum, and the eighth pin 108 moves to the A end of the inclined groove 42. The force applied in this process reaches the maximum; 4) As shown in Figures 6 to 9, when the door panel fixing seat moves from 25 degrees to 30 degrees, the roller 704 rolls over the cam vertex to the convex surface of the second arc segment of the cam, and the spring 703 releases part of the energy; 5) As shown in Figures 6 to 7, when the door panel fixing seat 10 is at 30 degrees, the roller 704 moves to the convex surface of the second arc segment on the cam. shaped surface and the intersection of the arc surface on the first arc segment. At this time, the spring 703 is still in an extruded state after releasing part of the energy; 6) As shown in Figures 1 to 5, when the door panel fixing seat moves from 30 degrees to 115 degrees, the roller 704 is tangent to the arc surface on the cam and has no effect on the movement of the spring, but at this time the spring 703 is still in an extruded state until the roller 704 moves to the end of the first arc segment 8101 on the cam, and the eighth pin 108 moves to the A end of the inclined slot 42, as shown in Figures 1 to 3, and the door panel fixing seat is opened to 115 degrees.

[0044] During the door closing process, when the door panel moves from 115 degrees to 30 degrees, the roller 704 is tangent to the arc surface on the first arc segment 8101 of the cam, and no squeezing is produced on the spring 703; and in the process of moving from 30 degrees to 25 degrees, the roller 704 climbs along the convex surface of the second arc segment 8102 on the cam and begins to squeeze the spring 703; when it is at 25 degrees, the roller 704 is at the cam apex on the cam 81, and the squeezing of the spring 703 reaches its maximum; after the roller 704 passes the cam apex, it goes downhill along the concave surface of the second arc segment 8102 and the side wall of the placement groove 82, and the A end of the eighth pin moves to the B end. At this time, the spring releases energy and automatically rotates the door panel fixing seat 10 toward the cabinet fixing seat 20 to achieve automatic door closing.

[0045] It is worth noting that the maximum opening angle is 115° and the minimum closing angle is -2°; when the door is closed to 25 degrees, the roller 704 passes the apex of the cam and moves downhill along the roller 704. The spring releases energy to automatically close the door. The force that drives the roller 704 to pass the apex of the cam is recorded as the closing force and the locking force. Conversely, when opening the door, the roller needs to climb along the cam, which requires energy. The force that drives the roller 704 to climb to the apex of the cam is the door opening force.

[0046] In summary, the technical solution of the present utility model can fully and effectively achieve the above-mentioned purpose of the utility model, and the structure and functional principles of the present utility model have been fully verified in the embodiments and can achieve the expected efficacy and purpose. Without departing from the principle and essence of the present utility model, various changes or modifications can be made to the embodiments of the utility model. Therefore, the present utility model includes all replacement contents within the scope of the patent application, and any equivalent changes made within the scope of the patent application of the present utility model are within the scope of the patent application of this case.

Claims

1. An opening and closing hinge, comprising a door panel fixing seat (10) fixed on a door body and a cabinet fixing seat (20) fixed on a cabinet body, characterized in that: The cabinet body fixing seat (20) is hinged to one end of the rocker arm (30) via a first hinge shaft (101), the other end of the rocker arm is hinged to one end of the front bracket (40) via a second hinge shaft (102), the other end of the front bracket (40) is hinged to one end of the door panel fixing seat (10) via a third hinge shaft (103), and the other end of the door panel fixing seat (10) is hinged to one end of the door panel fixing seat (10) via a third hinge shaft (103). The fourth hinge shaft (104) is hinged to one end of the rear bracket (50), and the other end of the rear bracket (50) is hinged to the rocker arm (30) via a fifth hinge shaft (105), and the fifth hinge shaft (105) is located between the first hinge shaft (101) and the second hinge shaft (102); the cabinet fixing seat (20) is also hinged to one end of the lever arm (60) via a sixth hinge shaft (106), and the other end of the lever arm (60) is hinged to the rear bracket (50) via a seventh hinge shaft (107), and the seventh hinge shaft (107) is located between the fourth hinge shaft (104) and the fifth hinge shaft (105); the self-locking spring assembly (70) is located in the front bracket (40), the other end of the self-locking spring assembly (70) is hinged to the other end of the rocker arm (30) through the second hinge shaft (102), and the eighth hinge shaft (108) is located between the second hinge shaft (102) and the third hinge shaft (103); the connecting rod (80) is located in the door panel fixing seat (10), one end of the connecting rod (80) is hinged to the rear bracket (50) through the fourth hinge shaft (104), and the other end of the connecting rod (80) is hinged to the rear bracket (50) through the fourth hinge shaft (104). The self-locking spring assembly (70) is hinged in the front bracket (40) via a third hinge shaft (103); the self-locking spring assembly (70) comprises a roller (704) for rolling along the side wall of the connecting rod when opening and closing; the roller (704) is sleeved on the eighth hinge shaft; the side wall of the front bracket is provided with an inclined groove (42) cooperating with the eighth hinge shaft; the connecting rod (80) is provided with a cam (81) cooperating with the roller (704); one end of the connecting rod (80) is provided with a placement groove (82) located in front of the cam (81) for placing the roller when the door panel fixing seat is closed.

2. The opening and closing hinge according to claim 1, characterized in that: The self-locking spring assembly (70) comprises an axle spring seat (701), a bushing spring seat (702) matched with the axle spring seat (701), and a spring (703) located between the axle spring seat (701) and the bushing spring seat (702); the axle spring seat (701) is hinged to the front bracket (40) via an eighth hinge shaft (108); the bushing spring seat (702) is hinged to the rocker arm (30) via a second hinge shaft (102); a mounting groove (7011) is provided on the axle spring seat (701); and the roller (704) is mounted in the mounting groove (7011) via the eighth hinge shaft (108).

3. The opening and closing hinge according to claim 1, characterized in that: The cabinet fixing seat (20) is provided with a lower receiving groove (21) for accommodating a rocker arm in a folded state, and one end of the rocker arm (30) extends into the lower receiving groove (21) and is hinged to a side wall of the lower receiving groove (21) via a first hinge shaft (101); the door panel fixing seat (10) is provided with an upper receiving groove (11) for accommodating a front bracket (40) and a rear bracket (50) in a folded state, and the connecting rod is located in the upper receiving groove, and the other end of the front bracket (40) extends into the upper receiving groove (11) and is hinged to a side wall of the upper receiving groove (11) via a third hinge shaft (103).

4. The opening and closing hinge according to claim 1, characterized in that: The rocker arm (30) is provided with a first receiving groove (31) for receiving a front bracket (40), a rear bracket (50) and a folded state force arm (60); one end of the front bracket (40) extends into the first receiving groove (31) and is hinged to a side wall of the first receiving groove (31) via a second hinge shaft (102); the other end of the rear bracket (50) extends into the first receiving groove and is hinged to a side wall of the first receiving groove (31) via a fifth hinge shaft (105); the front bracket (40) is provided with a second receiving groove (41) for receiving a self-locking spring assembly (70); and an inclined groove (42) is provided on the side wall of the second receiving groove (41).

5. The opening and closing hinge according to claim 1, characterized in that: The rear support (50) is provided with a connecting groove (51) for accommodating the connecting rod (80) in the folded state.

6. The opening and closing hinge according to claim 1, characterized in that: A pin hole (801) cooperating with the eighth pin 108 is formed at one end of the connecting rod (80), and the cam (81) is divided into a first arc segment (8101) and a second arc segment (8102) connected in sequence, and there is a smooth transition between the first arc segment (8101) and the second arc segment (8102), the first arc segment (8101) is a circular arc surface centered on the pin hole 801, one side of the second arc segment (8102) is a convex surface connected to the first arc segment (8101), and the other side of the second arc segment (8102) is a concave surface connected to the mounting groove, and the second arc segment (8102) has a cam vertex, the cam vertex is farthest from the center of the pin hole (801), and the distance between the front end of the other side of the second arc segment (8102) and the center of the pin hole (801) is the shortest.

7. The opening and closing hinge according to claim 1, characterized in that: The connecting rod (80) is provided with a clearance groove (83) located at the rear side of the cam (81).

8. The opening and closing hinge according to claim 1, characterized in that: A track groove (12) cooperating with the eighth hinge shaft (108) is provided on the side wall of the door body fixing seat.

9. The opening and closing hinge according to claim 1, characterized in that: One end of the cabinet fixing seat (20) is also connected to a baffle 22 for preventing the rocker arm (30) from rotating in the reverse direction.

10. The opening and closing hinge according to claim 1, characterized in that: The opening angle range between the door panel fixing seat (10) and the cabinet fixing seat (20) is -2 to 115 degrees.

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