WO2025015499A1 - Opening/closing hinge - Google Patents

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

The utility model relates to the field of hinges, in particular to an opening and closing hinge.

Background Art

The hinges between the doors and cabinets of existing refrigerators, freezers, and various storage cabinets are mostly coaxially hinged. However, due to the certain thickness of the door, the door will be pressed between the cabinets during opening, and the door cannot be opened flexibly, making it inconvenient to take and put items. In addition, during the closing process, the door cannot be automatically sucked in at a small angle, and the entire closing process needs to be pushed manually, which brings a poor user experience, resulting in poor sealing between the cabinets and doors of refrigerators, freezers, and various storage cabinets, especially the overall performance of refrigerators and freezers is reduced.

Technical Solutions

In view of the above problems, the utility model provides an opening and closing hinge, which is more labor-saving during the door closing process. Within a certain door closing angle range, the door body can be automatically sucked together, which is convenient to use and brings a comfortable experience to users.

The technical solution adopted by the utility model is:

A kind of opening and closing hinge, including a door panel fixing seat fixed on the door body and a cabinet fixing seat fixed on the cabinet body, and also including 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 Hinge, the seventh hinge shaft is between the fourth hinge shaft and the fifth hinge shaft; the self-locking spring assembly is in the front bracket, 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, the roller is sleeved on the eighth hinge shaft, the side wall of the front bracket is provided with an inclined groove cooperating with the eighth hinge shaft, the connecting rod is provided with a cam cooperating with the roller, 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.

Preferably, the self-locking spring assembly includes an axle spring seat, a bushing spring seat cooperating with the axle spring seat, and a spring between the axle spring seat and the bushing spring seat. The axle 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 axle spring seat, and the roller is installed in the installation groove through the eighth hinge shaft.

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

More preferably, the rocker arm is provided with a first groove for accommodating the front bracket, the rear bracket and the force arm in the folded state, 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.

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

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 there is a smooth transition between the first arc segment and the second arc segment. 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 mounting groove. 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.

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

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

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

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

Beneficial Effects

Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model 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 deployment 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 can be opened flexibly, and the door body opening angle range is -2~115 degrees, which is convenient for taking and putting 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; when opening the door, it is necessary to overcome a certain resistance to open the door body, and the sealing between the door body and the cabinet body is better.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 2 is a diagram showing the internal structure of an opening and closing hinge provided by the present invention when the opening is 115 degrees.

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

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

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

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

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

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

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

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

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

FIG12 is a schematic diagram of a hinge provided by the present invention at a closed position of -2 degrees;

FIG13 is an internal structure diagram of an opening and closing hinge provided by the present invention at a closed state of -2 degrees;

FIG14 is a cross-sectional view of a closed -2 degree opening and closing hinge provided by the present invention;

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

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

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

FIG. 18 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

The preferred implementation modes provided by the utility model are described in detail according to the accompanying drawings.

Figures 1 to 18 are preferred embodiments of an opening and closing hinge provided by the utility model. As shown in Figures 1 to 15, the hinge includes a door panel fixing seat 10 fixed on a door body 100, a cabinet fixing seat 20 fixed on a cabinet 200, a rocker arm 30, a front bracket 40, a rear bracket 50, a force 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 one end of the door panel fixing seat 10. 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 for placing the roller 704 when the door panel fixing seat 10 is closed is formed on the front side of the cam. 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 are separated with a gap. The door body is opened flexibly, and the door body connected to the door panel fixing seat 10 is kept in an open state. The door body opening angle range is -2 to 115 degrees, which is convenient for taking and placing items; when folding and retracting, each arm body is stored between the door panel fixing seat 10 and the cabinet fixing seat 20, which does not affect the closing of the door body, and keeps the door body connected to the door panel fixing seat 10 in a closed state; and in the process of opening and closing 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. 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, and the door body is tightly closed when it is opened, and the angle is stable when it is opened. The connecting rod is also provided with a space-avoiding groove 83 at the rear side of the cam and a placement groove 82 at the front side of the cam. When the roller 704 moves to the front end and end of the cam, it avoids interference with the movement of the roller 704.

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. The axial spring seat 701 is provided with a mounting groove 7011, and the roller 704 is installed in the mounting 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.

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 82. The second arc segment 8102 has a cam vertex, the cam vertex 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 of the first arc segment 8101 and the second arc segment 8102 on one side, 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 connection position of the first arc segment 8101 and the second arc segment 8102 on one side, 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 receiving groove 82 to the bottom of the receiving 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.

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 door 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 door 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 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.

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 and the door panel fixing seat 10 move synchronously; 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 seat 20; the front bracket 40 rotates around the second hinge shaft 102 toward the direction close to the self-locking spring assembly 70, and the rear bracket 50 rotates around the fifth hinge shaft 105 toward the direction close to the force arm 60, and at the same time drives the connecting rod 80 connected to the front bracket 40 and the rear bracket 50 to rotate toward the direction close to the cabinet fixing seat 20, and 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 seat 20 is also connected to a baffle 22 for preventing the rocker arm from rotating in the opposite direction, so as to prevent 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 matches the eighth hinge shaft 108 . When the roller 704 contacts the placement groove 82 and the cam 81 on the connecting rod 80 , the eighth hinge shaft 108 is driven to move along the track groove 12 .

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 arm 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. 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. The inclined groove 42 is arranged 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 arm 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 arm 60, and the lever arm 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 received in the first receiving groove 31, and the other end of the lever arm 60 is also received 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 .

The rear bracket 50 is provided with a connection groove 51 for accommodating the folded state connecting rod 80. The folded state front bracket 40 is on the rear bracket 50. The folded state connecting rod 80 is in a nearly horizontal state in the connection groove 51. One end of the connecting rod 80 is hinged to the rear bracket 50 through the fourth pin 104, and the other end of the connecting rod 80 is hinged to the front bracket 40 through the third pin 103. The rear bracket 50 includes two side panels, and the connection groove 51 is formed between the two side panels. The same side of the two side panels is connected by a first connecting rod and a second connecting rod. A rear opening is formed between the two connecting rods for the other end of the power supply arm 60 to extend into the rear bracket 50 and be hinged through the seventh hinge shaft 107.

One side of the door panel fixing base 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 base 20 is provided with a second mounting plate 23 for mounting on one side of the cabinet, and is mounted on the cabinet through the second mounting plate 23.

Figures 1 to 3 are schematic diagrams of the opening and closing hinge when the door is opened 115 degrees; Figures 4 to 5 are schematic diagrams of the opening and closing hinge when the door is opened 60 degrees; Figures 6 to 7 are schematic diagrams of the opening and closing hinge when the door is opened 30 degrees. As shown in Figure 2, the end of the inclined slot 42 close to the rocker arm 30 is marked as end A, and the other end of the inclined slot 42 close to the connecting rod 80 is marked 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 fits 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, it is necessary to overcome the resistance of the roller rising during the door opening process, and a certain force is required to open the door body; 3) As shown in Figures 8 to 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, the highest point (cam vertex) in the shaft spring seat 701, the extrusion of the spring 703 by the shaft spring seat 701 reaches the maximum, and the eighth pin shaft 108 moves to the A end of the inclined groove 42, and 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 crosses the cam vertex and rolls to the convex surface of the second arc segment of the cam, and the spring 703 releases part of its 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 shaft 108 moves to the A end of the inclined groove 42, as shown in Figures 1 to 3, and the door panel fixing seat is opened to 115 degrees.

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; during the movement 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 the 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.

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 over the top of the cam and goes downhill along the roller 704. The spring releases energy to achieve automatic door closing. The force that drives the roller 704 over the top of the cam is recorded as the door closing force and the door 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 top of the cam is the door opening force.

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

Claims (10)

A hinge for opening and closing, 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 it also comprises a rocker arm (30), a front bracket (40), a rear bracket (50), a force arm (60), a self-locking spring assembly (70) and a connecting rod (80), wherein the cabinet 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), and the other end of the front bracket (40) is hinged to one end of the front bracket (40) via a third hinge shaft (103). The shaft (103) is hinged to one end of the door panel fixing seat (10); 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); 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) through a sixth hinge shaft (106); the other end of the lever arm (60) is hinged to the rear bracket (50) through a seventh hinge shaft (107). The bracket (50) is hinged, 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). The other end of the connecting rod (80) 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), and 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. The opening and closing hinge according to claim 1 is characterized in that: the self-locking spring assembly (70) includes an axial spring seat (701), a bushing spring seat (702) matched 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 an eighth hinge shaft (108), the bushing spring seat (702) is hinged to the rocker arm (30) through a second hinge shaft (102), a mounting groove (7011) is provided on the axial spring seat (701), and the roller (704) is installed in the mounting groove (7011) through the eighth hinge shaft (108). The opening and closing hinge according to claim 1 is 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, 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 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, the connecting rod is 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 the side wall of the upper receiving groove (11) through a third hinge shaft (103). The opening and closing hinge according to claim 1 is characterized in that: 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 force arm (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); the other end of the rear bracket (50) extends into the first receiving groove and is hinged to the side wall of the first receiving groove (31) 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 arranged on the side wall of the second receiving groove (41). The opening and closing hinge according to claim 1 is characterized in that: the rear bracket (50) is provided with a connecting groove (51) for accommodating the connecting rod (80) in the folded state. The opening and closing hinge according to claim 1 is 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. The opening and closing hinge according to claim 1 is characterized in that: the connecting rod (80) is provided with a clearance groove (83) located at the rear side of the cam (81). The opening and closing hinge according to claim 1 is 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. The opening and closing hinge according to claim 1 is 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. The opening and closing hinge according to claim 1 is characterized in that the opening angle between the door panel fixing seat (10) and the cabinet fixing seat (20) ranges from -2 to 115 degrees.