Automatic door closing mechanism and cooking appliance having the same

Abstract

The application provides an automatic door closing mechanism, which comprises a door body assembly (1), a fixed door hook (4) fixed on the door body assembly (1) and a door closing assembly (6). The fixed door hook (4) has a fixed door hook hook end (401). The door closing assembly (6) comprises an interlocking support seat (601) provided with an interlocking support self-locking arm guide rail (601f) with an interlocking support self-locking arm clamping portion (601g), an interlocking support upper cover (611) combined on the interlocking support seat (601), a movable machine box (612) capable of moving horizontally, and a tension spring (609) with one end fixed on the interlocking support seat (601) and the other end fixed on the movable machine box (612). In the open door state, the movable machine box (612) is stopped by the interlocking support self-locking arm clamping portion (601g); during the process of closing the door, the fixed door hook hook end (401) can be combined with the movable machine box (612), and the fixed door hook (4) moves to the door closing direction together with the movable machine box (612) under the action of the tension spring (609).

Description

TECHNICAL FIELD

[0001] The present application relates to the field of kitchen appliances, and in particular to an automatic door closing mechanism and a cooking appliance having the same. BACKGROUND

[0002] A door assembly is usually provided in a microwave oven, an oven or the like box-type cooking appliance, and is arranged on a box body of the box-type cooking appliance in an openable and closable manner. With the continuous improvement of people's living standards, people increasingly need cooking appliances with higher convenience.

[0003] The existing door assembly of a microwave oven or an oven is usually not provided with a buffer design, which often causes a lot of noise. In order to minimize the noise during use, a microwave oven with a door buffer mechanism is currently proposed. The implementation is to provide a movable slider with a return tension spring and make it run in a variable track extending in a downward angular direction, rely on the action of gravity and the tension of the spring, form a movable slider self-locking in the starting position / standby position when opening the door, and when closing the door, trigger the cam to contact and break the mechanical balance of the movable slider in the starting position. The force generated by the spring reset drives the slider to move and realizes self-suction closing. It can be seen that the microwave oven with a door buffer mechanism can reduce the noise during use, and further improve the convenience of use by realizing the effect of self-suction closing.

[0004] However, in the existing technology, the design of automatic door closing or slow door closing is mainly concentrated in the products of downward and upward opening doors. The buffer structure is usually designed at the position of the hinge and the handle end, which has sufficient space and is relatively easy to implement. However, in the microwave oven, oven and other cooking appliance products with a flat door, it is not convenient to add a buffer mechanism at the door hinge due to the small space and structure. Moreover, in the existing technology, the buffer door closing device usually uses a track with an angle, a cam mechanism and the like, which needs to rely on gravity to participate, so that the gravity and the spring tension applied to the slider form a force system balance, and finally the slider is self-locked on the inclined surface. However, the slow door closing structure needs a larger space to be placed, so its versatility is poor and the production cost is high.

[0005] Therefore, it is necessary to improve the existing automatic door closing mechanism to improve its versatility and reduce the production cost. SUMMARY

[0006] In view of this, the present application provides an automatic door closing mechanism, comprising:

[0007] a door assembly;

[0008] a fixed door hook, which is fixedly installed on the door assembly and has a fixed door hook hook end portion extending outward; and

[0009] A door closing assembly, comprising:

[0010] an interlocking support seat, an interlocking support self-locking arm guide rail extending in a horizontal direction is arranged on the interlocking support seat, and an interlocking support self-locking arm clamping portion is arranged at an outer side end of the interlocking support self-locking arm guide rail,

[0011] an interlocking support upper cover capable of being combined on the interlocking support seat,

[0012] a movable case arranged between the interlocking support seat and the interlocking support upper cover, the movable case being capable of moving relative to the interlocking support seat and the interlocking support upper cover in a horizontal direction;

[0013] a tension spring arranged between the interlocking support seat and the interlocking support upper cover, one end of the tension spring being fixedly installed on the interlocking support seat, and the other end being fixedly connected to the movable case;

[0014] wherein, in an open door state, the movable case is stopped by the interlocking support self-locking arm clamping portion; in a door closing process, the fixed door hook hook end portion can be combined with the movable case, and under the action of the tension spring, the fixed door hook moves together with the movable case in a door closing direction.

[0015] Preferably, the movable case comprises:

[0016] a locking rocker and a self-locking rocker rotatably installed in a housing of the movable case;

[0017] a driving arm capable of moving in an up-down direction, the driving arm being movably connected to one end of the locking rocker and one end of the self-locking rocker;

[0018] a self-locking arm capable of moving in the up-down direction, the self-locking arm being movably connected to the other end of the self-locking rocker;

[0019] a locking arm capable of moving in the up-down direction, the locking arm being movably connected to the other end of the locking rocker; and

[0020] a case compression spring, one end of the case compression spring being fixedly connected to a lower end surface of the driving arm, and the other end of the case compression spring being slidably abutted against an inner side wall surface of the movable case. One end of the driving arm, one end of the locking rocker, and one end of the self-locking rocker are movably connected through a first rotating shaft; the self-locking arm and the self-locking rocker are movably connected through a second rotating shaft; and the locking arm and the locking rocker are movably connected through a third rotating shaft.

[0021] Preferably, the shell of the movable cabinet is composed of a cabinet lower shell and a cabinet upper shell which can be combined with each other; the top wall surface of the cabinet upper shell is provided with a positioning hole aligned with the driving arm, the driving arm can move upward through the positioning hole aligned with the driving arm; the bottom wall surface of the cabinet lower shell is provided with a positioning hole aligned with the self-locking arm, the self-locking arm can move downward through the positioning hole aligned with the self-locking arm; the top wall surface of the cabinet upper shell is provided with a positioning hole aligned with the locking arm, the locking arm can move upward through the positioning hole aligned with the locking arm.

[0022] Preferably, the hook end of the fixed door hook comprises: a first fixed door hook driving surface arranged at an inclined angle; a second fixed door hook driving surface arranged at the bottom edge side of the hook end of the fixed door hook; a third fixed door hook driving surface arranged at the inner edge side of the hook end of the fixed door hook; and a fourth fixed door hook driving surface arranged at the outer edge side of the hook end of the fixed door hook. The first fixed door hook driving surface is arranged between the second fixed door hook driving surface and the fourth fixed door hook driving surface.

[0023] Preferably, the door closing assembly further comprises a damper, and the movable cabinet further comprises a damper clamping portion; the damper clamping portion can be in contact with the movable end of the damper with the movement of the movable cabinet.

[0024] Preferably, the automatic door closing mechanism further comprises a movable door hook and a door hook tension spring, the movable door hook is slidably installed in the fixed door hook, one end of the door hook tension spring is connected with the movable door hook, and the other end of the door hook tension spring is connected with the door body assembly.

[0025] Preferably, the movable door hook comprises an outwardly extending hook end, the hook end is formed as a bent hook portion and has a first movable door hook inclined surface at the outer edge side and a second movable door hook inclined surface at the inner side; the interlocking support seat is further provided with a first interlocking support movable door hook slope extending in an inclined upward direction and a second interlocking support movable door hook slope extending in an inclined downward direction connected with the first interlocking support movable door hook slope; in the door closing process, the first movable door hook inclined surface is in contact with the first interlocking support movable door hook slope, or the second movable door hook inclined surface is in contact with the second interlocking support movable door hook slope.

[0026] Preferably, the door closing assembly further comprises, between the interlocking support seat and the interlocking support upper cover:

[0027] a driving rack, the driving rack can move in the horizontal direction, and the fourth fixed door hook driving surface of the hook end of the fixed door hook can contact the driving rack in the door closing process;

[0028] a gear, the driving rack is in meshing transmission with the gear;

[0029] A driven rack, which is capable of moving in horizontal direction, the gear is engaged with the driven rack to drive;

[0030] A rack spring, one end of which is fixed on the interlocking support seat, and the other end of which is fixedly connected with the driven rack.

[0031] Preferably, the door closing assembly further comprises a first micro switch, a second micro switch and a third micro switch; when the door body assembly is in the fully closed position, the first micro switch is triggered by the first movable door hook inclined surface, and the second micro switch and the third micro switch are triggered by the driven rack.

[0032] The application further provides a cooking appliance with the automatic door closing mechanism.

[0033] The automatic door closing mechanism and the cooking appliance with the same according to the application can realize the automatic door closing effect of the door body assembly only by giving a small initial kinetic energy to the door body assembly, and can realize slow door closing, greatly reduce the noise when closing, realize compact structure and stable operation, and have high universality, easy processing and low production cost. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings are used to further understand the technical scheme of the application, and constitute a part of the specification, and are used together with the embodiments of the application to explain the technical scheme of the application, but do not constitute a limitation to the technical scheme of the application.

[0035] Figure 1 Fig. 1 is a schematic diagram showing the overall structure of the automatic door closing mechanism of the application and related components of the box-type cooking appliance;

[0036] Figure 2 Fig. 2 is a schematic diagram showing the exploded structure of the automatic door closing mechanism of the application;

[0037] Figure 3a 、 Figure 3b Fig. 3 is a schematic diagram showing the front and back structures of the door closing assembly in the automatic door closing mechanism of the application;

[0038] Figure 4 Fig. 4 is a schematic diagram showing the structure of the door body assembly and the door closing assembly in the open state in the automatic door closing mechanism of the application;

[0039] Figure 5 Fig. 5 is a schematic diagram showing the structure of the movable door hook, the fixed door hook and the door closing assembly in the automatic door closing mechanism of the application;

[0040] Figure 6Another structural schematic diagram of the movable door hook, the fixed door hook and the door closing assembly in the automatic door closing mechanism of the present invention;

[0041] Figure 7 It is another structural schematic diagram of the movable door hook, the fixed door hook and the door closing assembly in the automatic door closing mechanism of the present invention;

[0042] Figure 8 It is a structural schematic diagram of the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention starting to move toward the door closing assembly;

[0043] Figure 9 Compared with the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention Figure 8 A schematic diagram of the structure moving further towards the door closing assembly;

[0044] Figure 10 Compared with the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention Figure 9 A schematic diagram of the structure moving further towards the door closing assembly;

[0045] Figure 11 Compared with the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention Figure 10 A schematic diagram of the structure moving further towards the door closing assembly;

[0046] Figure 12 Compared with the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention Figure 11 A schematic diagram of the structure moving further towards the door closing assembly;

[0047] Figure 13 Compared with the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention Figure 12 A schematic diagram of the structure moving further towards the door closing assembly;

[0048] Figure 14 It is a structural schematic diagram of the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention moving in a direction away from the door closing assembly;

[0049] Figure 15 Compared with the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention Figure 14 A schematic diagram of the structure moving further away from the door closing assembly;

[0050] Figure 16 Compared with the movable door hook and the fixed door hook in the automatic door closing mechanism of the present invention Figure 15 Schematic diagram of the structure moving further away from the door closing assembly.

[0051] Figure 17 It is a structural schematic diagram of the movable door hook, fixed door hook and door closing assembly in the automatic door closing mechanism of the present invention in the door opening state.

[0052] BRIEF DESCRIPTION OF DRAWINGS

[0053] 1 - door body assembly 101 - upper door shaft

[0054] 102 - upper door shaft support 103 - door body frame

[0055] 103a - door body frame tension spring hook 104 - lower door shaft support

[0056] 105 - lower door shaft 2 - movable door hook

[0057] 201 - first movable door hook guide rail 202 - movable door hook hook end

[0058] 203 - second movable door hook guide rail 204 - movable door hook hook end

[0059] 204a - first movable door hook ramp 204b - second movable door hook ramp

[0060] 3 - door hook tension spring 4 - fixed door hook

[0061] 401 - fixed door hook hook end 401a - first fixed door hook drive face

[0062] 401b - second fixed door hook drive face 401c - third fixed door hook drive face

[0063] 401d - fourth fixed door hook drive face 402 - fixed door hook screw post

[0064] 5 - front plate 6 - door closing assembly

[0065] 601 - interlock support seat 601a - first interlock support seat rail

[0066] 601b - second interlock support seat rail 601c - third interlock support seat rail

[0067] 601d - first interlock support movable door hook ramp 601e - second interlock support movable door hook ramp

[0068] 601f - interlock support self-locking arm guide rail 601g - interlock support self-locking arm detent

[0069] 602 - first micro switch 602a - first micro switch contact

[0070] 603 - rack tension spring 604 - driven rack

[0071] 604a - driven rack ramp 604b - first driven rack guide

[0072] 604c - driven rack installation indication arrow 604d - driven rack end face

[0073] 604e - second driven rack guide 605 - gear

[0074] 606 - second micro switch 606a - second micro switch contact

[0075] 607 - third micro switch 607a - third micro switch contact

[0076] 608 - drive rack 608a - second drive rack guide

[0077] 608b - first drive rack guide 608c - drive rack installation indication arrow

[0078] 608d - drive rack end face 609 - tension spring

[0079] 610 - damper 611 - interlock support upper cover

[0080] 611a - first interlock support upper cover rail 611b - second interlock support upper cover rail

[0081] 611c - third interlock support upper cover rail 612 - movable case

[0082] 612a - first rotating shaft 612b - second rotating shaft

[0083] 612c - self-locking arm 612d - self-locking rocker

[0084] 612e - case compression spring 612f - case lower shell

[0085] 612g - third rotating shaft 612h - locking rocker

[0086] 612i - locking arm 612j - drive arm

[0087] 612k - case upper shell 612m - first case guide

[0088] 612n - second case guide 612p - damper detent

[0089] 612r - movable case buckle 612s - movable case fixing screw DETAILED DESCRIPTION

[0090] Various exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses. The present application can be implemented in numerous ways, including not only the embodiments described herein but also other ways. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. It should be noted that the relative arrangement of components and steps set forth in these embodiments should be interpreted as merely exemplary, and not as a limitation unless otherwise specifically stated.

[0091] Figure 1 The overall structure of the relevant components of the automatic door closing mechanism of the present application is shown in the schematic diagram of the cooking appliance, such as a microwave oven, oven, etc. The automatic door closing mechanism of the present application includes: a door body assembly 1, a movable door hook 2, a door hook tension spring 3, a fixed door hook 4, and a door closing assembly 6.

[0092] The door body assembly 1 is pivotally mounted on the box body of the cooking appliance, and the door closing assembly 6 is fixedly mounted in the box body of the cooking appliance. The door closing assembly 6 can be fixedly connected with the front plate 5 as a component of the cooking appliance box body, or can be fixedly mounted on the bottom plate of the box body.

[0093] As shown in Figure 1 , the door body assembly 1 can be horizontally pivoted relative to the cooking appliance. Moreover, the fixed door hook 4 is fixedly mounted on the door body assembly 1, and the movable door hook 2 is slidably mounted in the fixed door hook 4. One end of the door hook tension spring 3 is connected with the movable door hook 2, and the other end of the door hook tension spring 3 is connected with the door body assembly 1.

[0094] Further as shown in 2, the door body assembly 1 includes: a door body frame 103, an upper door shaft support 102 located at the upper end of the door body frame 103, an upper door shaft 101 fixedly mounted in the upper door shaft support 102, a lower door shaft support 104 located at the lower end of the door body frame 103, and a lower door shaft 105 fixedly mounted in the lower door shaft support 104. The upper door shaft 101 and the lower door shaft 105 are aligned in the vertical direction, and by mounting the upper door shaft 101 and the lower door shaft 105 into the pivot shaft mounting hole of the cooking appliance, the pivoting movement of the door body assembly 1 around the axis of the upper door shaft 101 and the lower door shaft 105 can be achieved. Moreover, a tension spring hook 103a is provided in the door body frame 103, whereby the other end of the door hook tension spring 3 can be connected with the door body assembly 1 by being hooked on the tension spring hook 103a.

[0095] As shown in Figure 2 , the door body assembly 1 is pivotally mounted on the box body of the cooking appliance, and the door closing assembly 6 is fixedly mounted in the box body of the cooking appliance. The door closing assembly 6 can be fixedly connected with the front plate 5 as a component of the cooking appliance box body, or can be fixedly mounted on the bottom plate of the box body. Figure 5As shown, the movable door hook 2 comprises a first movable door hook rail 201, a movable door hook hook 202, a second movable door hook rail 203, and a movable door hook hook end portion 204 extending outward. The first movable door hook rail 201 can be slidably installed in the door body assembly 1. One end of the door hook tension spring 3 can be hooked with the movable door hook hook 202, so as to connect the door hook tension spring 3 with the movable door hook 2. The second movable door hook rail 203 can be slidably installed in the fixed door hook 4. The movable door hook hook end portion 204 is formed as a bent hook portion, and has a first movable door hook inclined surface 204a on the outer edge side and a second movable door hook inclined surface 204b on the inner side.

[0096] Referring to Figure 2 , Figure 5 and Figure 7 , the fixed door hook 4 comprises a fixed door hook hook end portion 401 extending outward. The fixed door hook hook end portion 401 comprises a first fixed door hook driving surface 401a arranged at an inclined angle, a second fixed door hook driving surface 401b arranged at the bottom edge side of the fixed door hook hook end portion 401, a third fixed door hook driving surface 401c arranged at the inner edge side of the fixed door hook hook end portion 401, and a fourth fixed door hook driving surface 401d arranged at the outer edge side of the fixed door hook hook end portion 401. The first fixed door hook driving surface 401a is arranged between the second fixed door hook driving surface 401b and the fourth fixed door hook driving surface 401d. The fixed door hook 4 is further provided with a fixed door hook screw column 402. The fixed door hook 4 can be fixed to the door body assembly 1 through the fixed door hook screw column 402.

[0097] As shown in Figures 2 to 7 , the door closing assembly 6 comprises an interlocking support seat 601, an interlocking support upper cover 611 capable of being combined on the interlocking support seat 601, and a first micro switch 602, a rack tension spring 603, a driven rack 604, a gear 605, a second micro switch 606, a third micro switch 607, a driving rack 608, a tension spring 609, a damper 610, and a movable case 612 arranged between the interlocking support seat 601 and the interlocking support upper cover 611.

[0098] The interlocking support seat 601 is provided with a first interlocking support seat rail 601a, a second interlocking support seat rail 601b, and a third interlocking support seat rail 601c. The first interlocking support seat rail 601a, the second interlocking support seat rail 601b, and the third interlocking support seat rail 601c are all arranged to extend in the horizontal direction.

[0099] And, the interlocking support seat 601 is further provided with a first interlocking support movable door hook ramp 601d and a second interlocking support movable door hook ramp 601e connected with the first interlocking support movable door hook ramp 601d. The first interlocking support movable door hook ramp 601d is arranged to extend in an upwardly inclined direction, and the second interlocking support movable door hook ramp 601e is arranged to extend in a downwardly inclined direction.

[0100] The interlocking support seat 601 is further provided with an interlocking support self-locking arm guide rail 601f extending in a horizontal direction, and has an interlocking support self-locking arm clamping portion 601g at an outer side end of the interlocking support self-locking arm guide rail 601f.

[0101] The interlocking support upper cover 611 is provided with a first interlocking support upper cover rail 611a, a second interlocking support upper cover rail 611b and a third interlocking support upper cover rail 611c. The first interlocking support upper cover rail 611a, the second interlocking support upper cover rail 611b and the third interlocking support upper cover rail 611c are all arranged to extend in a horizontal direction, and are respectively aligned with the first interlocking support seat rail 601a, the second interlocking support seat rail 601b and the third interlocking support seat rail 601c.

[0102] The first micro switch 602 has a first micro switch contact 602a. When the first micro switch contact 602a is pressed, the first control circuit in the cooking appliance can be turned on, so that the control unit of the cooking appliance can receive a signal that the first control circuit is turned on.

[0103] One end of the rack pull spring 603 is fixed on the interlocking support seat 601, and the other end of the rack pull spring 603 is fixedly connected with the driven rack 604.

[0104] The driven rack 604 is slidably mounted on the interlocking support seat 601, and can slide relative to the interlocking support seat 601 in a horizontal direction. The gear 605 is rotatably mounted on the interlocking support seat 601, and is in meshing transmission with the driven rack 604. The drive rack 608 is slidably mounted on the interlocking support seat 601, and can also slide relative to the interlocking support seat 601 in a horizontal direction, and is in meshing transmission with the gear 605. Thus, when the drive rack 608 slides relative to the interlocking support seat 601 in a horizontal direction, the gear 605 is rotated, and in turn the driven rack 604 can be driven by the gear 605 to slide relative to the interlocking support seat 601 in a horizontal direction. At this time, the drive rack 608 and the driven rack 604 move in opposite directions.

[0105] In the driven rack 604, a driven rack slope 604a is arranged at an inclined angle; a driven rack end face 604d is formed at one end side of the driven rack 604. The driven rack 604 is further provided with a first driven rack guide 604b and a second driven rack guide 604e. The first driven rack guide 604b and the second driven rack guide 604e can be shaft rod type guide members extending from the two side faces of the driven rack 604, capable of cooperating with the first interlocking support upper cover track 611a and the first interlocking support seat track 601a, thereby guiding the driven rack 604 to move in the horizontal direction. Preferably, the driven rack 604 is further provided with a driven rack installation indication arrow 604c for indicating the installation position.

[0106] The drive rack 608 comprises a first drive rack guide 608b and a second drive rack guide 608a. The first drive rack guide 608b and the second drive rack guide 608a can be shaft rod type guide members extending from the two side faces of the drive rack 608, capable of cooperating with the second interlocking support upper cover track 611b and the second interlocking support seat track 601b, thereby guiding the drive rack 608 to move in the horizontal direction. The drive rack 608 is further provided with a drive rack end face 608d at one end side. Preferably, the drive rack 608 further comprises a drive rack installation indication arrow 608c for indicating the installation position.

[0107] Preferably, the gear 605 is provided with an indication arrow for indicating the installation position.

[0108] The second micro switch 606 has a second micro switch contact 606a. When the second micro switch contact 606a is pressed, the second control circuit in the cooking appliance can be turned on, so that the control unit of the cooking appliance can receive the signal of the second control circuit being turned on.

[0109] The third micro switch 607 has a third micro switch contact 607a. When the third micro switch contact 607a is pressed, the third control circuit in the cooking appliance can be turned on, so that the control unit of the cooking appliance can receive the signal of the third control circuit being turned on.

[0110] One end of the tension spring 609 is fixedly installed on the interlocking support seat 601, and the other end is fixedly connected to the movable cabinet 612.

[0111] The movable case 612 comprises a lower case 612f and an upper case 612k which can be combined to form a case body. Inside the movable case 612, the first rotating shaft 612a, the second rotating shaft 612b, the self-locking arm 612c, the self-locking rocker 612d, the case compression spring 612e, the third rotating shaft 612g, the locking rocker 612h, the locking arm 612i and the driving arm 612j are installed inside the lower case 612f and the upper case 612k. The structure of each component inside the lower case 612f and the upper case 612k and the connection relationship between them will be described in detail below.

[0112] The locking rocker 612h and the self-locking rocker 612d have convex shafts on both sides of the middle part of each, and the locking rocker 612h and the self-locking rocker 612d can be rotatably installed in the movable case 612 through the convex shafts, i.e., rotatably installed on the combined lower case 612f and upper case 612k.

[0113] As shown in Figure 2 The locking rocker 612h is located in the left part of the movable case 612, and the self-locking rocker 612d is located in the right part of the movable case 612. The end of the locking rocker 612h close to the inside, the end of the self-locking rocker 612d close to the inside and the end of the driving arm 612j are all provided with shaft holes, and the first rotating shaft 612a passes through the shaft holes in sequence to make the locking rocker 612h, the self-locking rocker 612d and the driving arm 612j movably connected. And on the inner side wall surface of the movable case 612, at least on the inner side wall surface of the upper case 612k, a first slot rail is provided for guiding the driving arm 612j and the first rotating shaft 612a to move up and down. A positioning hole aligned with the driving arm 612j is provided in the top wall surface of the upper case 612k. The driving arm 612j can move upwards through the positioning hole aligned with the driving arm 612j.

[0114] The lower end surface of the driving arm 612j is fixedly connected with one end of the case compression spring 612e. The other end of the case compression spring 612e abuts against the inner side wall surface of the lower case 612f. The inner side wall surface of the lower case 612f is a horizontal wall surface, which allows the other end of the case compression spring 612e to slide thereon.

[0115] The end of the self-locking arm 612c and the end of the self-locking rocker 612d close to the outside are both provided with shaft holes, and the second rotating shaft 612b passes through the shaft holes in sequence to make the self-locking arm 612c and the self-locking rocker 612d movably connected. And on the inner side wall surface of the movable case 612, at least on the inner side wall surface of the lower case 612f, a second slot rail is provided for guiding the self-locking arm 612c to move up and down. A positioning hole aligned with the self-locking arm 612c is provided in the bottom wall surface of the lower case 612f. The self-locking arm 612c can move downwards through the positioning hole aligned with the self-locking arm 612c.

[0116] One end of the locking arm 612i and one end of the locking rocker 612h are provided with shaft holes, and the third rotating shaft 612g passes through the two shaft holes in sequence to make the locking arm 612i and the locking rocker 612h movably connected. And on the inner side wall surface of the movable case 612, at least on the inner side wall surface of the upper case shell 612k, a third groove rail is arranged for guiding the locking arm 612i to move up and down. The top wall surface of the upper case shell 612k is provided with a positioning hole aligned with the locking arm 612i. The locking arm 612i can move upwards through the positioning hole aligned with the locking arm 612i.

[0117] The movable case 612 further comprises a first case guide 612m, a second case guide 612n, a damper clamping part 612p and a movable case fixing screw 612s. The first case guide 612m and the second case guide 612n are arranged on the outer side surfaces of the two side walls of the movable case 612, and can cooperate with the third interlocking support base track 601c and the third interlocking support upper cover track 611c, so as to guide the movable case 612 to move horizontally relative to the interlocking support base 601 and the interlocking support upper cover 611.

[0118] The damper clamping part 612p is arranged at the lower end of the lower case shell 612f. With the movement of the movable case 612, the damper clamping part 612p can be in contact with the movable end of the damper 610.

[0119] The upper case shell 612k and the lower case shell 612f are connected by the movable case buckle 612r and the movable case fixing screw 612s, and can package complex mechanisms in a smaller movable case 612. The size of the movable case of the present application is preferably 32*12*16mm, which is small and compact in structure.

[0120] The action principle of the automatic door closing mechanism of the present application will be described in detail below.

[0121] As shown in Figure 8 After the door closing action starts, the fixed door hook 4 and the movable door hook 2 move in the direction of the arrow Figure 2The upper door shaft 101 and the lower door shaft 105 shown are the central axis for rotating the door. In the initial state, the rack tension spring 603 is in a stretched state. The driven rack installation indication arrow 604c, the driving rack installation indication arrow 608c and the indication arrow of the gear 605 are aligned. The movable chassis 612 is in a standby state, wherein the self-locking arm 612c is stuck in the interlocking support self-locking arm blocking portion 601g due to the action of the chassis compression spring 612e. That is, the movable chassis 612 is stopped by the interlocking support self-locking arm blocking portion 601g, and the door body assembly 1 is in an open state. At this time, the tension spring 609 is in a stretched state, maintaining a pulling force to the right. After the fixed door hook 4 enters the door closing assembly 6, the second fixed door hook drive surface 401b passes above the locking arm 612i, i.e. enters the movable chassis trigger position. As a result, the first fixed door hook driving surface 401 a contacts the driving arm 612 j , and the driving arm 612 j will be pressed into the movable chassis 612 .

[0122] like Figure 9 As shown, the fixed door hook 4 continues to move rightward, with the first fixed door hook driving surface 401a contacting the driving arm 612j, gradually pressing the driving arm 612j into the movable housing (seeing progress). As a result, the fixed door hook's hook end 401 engages the movable housing 612. Driven by the tension spring 609, the fixed door hook 4 moves rightward along with the movable housing 612. As the driving arm 612j is pressed into the movable housing 612, the locking arm 612i simultaneously extends out of the movable housing 612, assuming the principle of leverage. Simultaneously, the self-locking arm 612c retracts into the movable housing 612, releasing the self-locking state.

[0123] like Figure 10 As shown, the fixed door hook 4 continues to move to the right, and the movable chassis 612 will disengage from the interlocking support self-locking arm positioning portion 601g. Due to the blocking effect of the interlocking support self-locking arm guide rail 601f, the self-locking arm 612c cannot extend out of the movable chassis 612, thereby ensuring that the drive arm 612j remains retracted in the movable chassis 612 and the locking arm 612i remains extended. At this time, the movable chassis 612 is only subjected to a rightward pulling force provided by the tension spring 609. That is, at this time, the user does not need to apply a thrust to the door body assembly 1. Through the pulling force of the tension spring 609, the door body assembly 1 can automatically move in the closing direction, that is, to the right. Influenced by the movement of the internal mechanism of the movable chassis 612, the locking arm 612i extends and contacts the third fixed door hook drive surface 401c. At the same time, the damper locking portion 612p on the movable chassis 612 contacts the end of the damper 610. In the subsequent door closing process, the damper 610 will continue to provide a reverse force to control the reset speed of the tension spring 609.

[0124] like Figure 11As shown, the fixed door hook 4 continues to move to the right, the first movable door hook slope 204a begins to contact the first interlocking support movable door hook slope 601d. The door body assembly 1 continues to move to the right, the movable door hook 2 moves up and down along the first movable door hook guide rail 201 and the second movable door hook guide rail 203 while moving to the right, when the movable door hook 2 moves up and down, the door hook tension spring 3 is stretched and will always provide a downward pulling force to make the first movable door hook slope 204a of the movable door hook 2 tightly fit on the first interlocking support movable door hook slope 601d.

[0125] As shown, Figure 12 the fixed door hook 4 continues to move to the right and starts to trigger the gear transmission system. That is, in the process of continuing to close the door, the fourth fixed door hook driving surface 401d will contact the driving rack end surface 608d and in the following process, through the meshing of the driving rack 608 and the gear 605 and the meshing of the gear 605 and the driven rack 604, the driven rack 604 moves to the left. At the same time, the rack tension spring 603 is stretched and will provide a force completely opposite to the running direction of the driven rack 604. The driving rack 608 will move to the right along the second interlocking support upper cover rail 611b and the second interlocking support seat rail 601b, and the driven rack 604 will move to the left along the first interlocking support upper cover rail 611a and the first interlocking support seat rail 601a.

[0126] As shown, Figure 13As shown, the fixed door hook 4 continues to move rightward until the door assembly 1 is fully closed. The first movable door hook inclined surface 204a moves beyond the right end of the first interlocking support movable door hook ramp 601d, and the second movable door hook inclined surface 204b contacts the second interlocking support movable door hook ramp 601e. Under the continued downward force of the door hook tension spring 3, the movable door hook 2 is locked in its current position, maintaining contact between the second movable door hook inclined surface 204b and the second interlocking support movable door hook ramp 601e. Furthermore, the first movable door hook inclined surface 204a begins to press against the first microswitch contact 602a, thereby energizing the first control circuit in the cooking appliance, and the cooking appliance control unit receives the signal indicating the first control circuit is energized. At this point, the driven rack end surface 604d presses against the second microswitch contact 606a, energizing the second control circuit in the cooking appliance, and the cooking appliance control unit receives the signal indicating the second control circuit is energized. Furthermore, the driven rack ramp 604a contacts the third microswitch contact 607a, thereby energizing the third control circuit in the cooking appliance. The cooking appliance's control unit receives the signal that the third control circuit is energized. The damper 610 reaches its stop position, but still has a safety margin. The movable chassis 612 moves along the third interlocking support rail 601c and the third interlocking support cover rail 611c to its final position. At this point, the door hook tension spring 3 is stretched, providing a constant downward pull. On this basis, the tension spring 609 simultaneously acts to keep the door assembly 1 closed.

[0127] like Figure 14 As shown, when the door assembly 1 begins to open, that is, when the user begins to pull the door assembly 1 to the left, the fixed door hook 4 begins to move to the left. At this point, because the movable housing 612 has not yet moved to the interlocking support self-locking arm retaining portion 601g, the self-locking arm 612c is restricted by the interlocking support self-locking arm guide 601f and cannot extend from the movable housing 612. This results in the driving arm 612j being unable to extend from the movable housing 612 and the locking arm 612i remaining extended from the movable housing 612, causing the tension spring 609 to be stretched. The user overcomes the tension spring 609 and pulls the door assembly, causing the damper 610 to return to its initial state through its self-reset function. Specifically, the pressure on the damper retaining portion 612p is removed and the end of the damper 610 pops out. The force acting on the end face 608d of the driving rack disappears, and the driven rack 604 is reset by the rack tension spring 603, returning to its initial state. Under the influence of the continuous downward force of the door hook tension spring 3, the movable door hook 2 retracts to the initial position relative to the fixed door hook 4. In addition, the first micro switch 602, the second micro switch 606, and the third micro switch 607 are simultaneously powered off to ensure the safety of opening the door.

[0128] like Figure 15As shown, the fixed door hook 4 continues to move leftward, and the movable chassis 612 reaches the interlocking support self-locking arm engaging portion 601g. The self-locking arm 612c is no longer restricted by the interlocking support self-locking arm guide rail 601f and can thus extend normally into the movable chassis 612. As a result, the chassis compression spring 612e causes the driving arm 612j to extend out of the movable chassis 612, while the locking arm 612i simultaneously retracts into the movable chassis 612. At this point, the movable chassis 612 is locked in the interlocking support self-locking arm engaging portion 601g.

[0129] like Figure 16 As shown, the fixed door hook 4 continues to move to the left, and the second fixed door hook driving surface 401b passes over the locking arm 612i and slides out of the door closing assembly.

[0130] like Figure 17 As shown, the fixed door hook 4 continues to move to the left and completely leaves the door closing assembly 6. The current position is the door opening state and the initial state, and can wait for the next door closing and opening operation cycle.

[0131] It is worth clarifying that the cooking utensils mentioned in the technical solution of the present invention should include, but not be limited to, microwave ovens, ovens, microwave-air fryer combination ovens, steam ovens, microwave-air-fryer-steam and other combination ovens, and are especially suitable for cooking utensils with left and right doors, that is, horizontally opening doors.

[0132] In summary, according to the automatic door closing mechanism of the present invention, only a very small initial kinetic energy needs to be given to the door body assembly 1 to achieve the effect of automatic door closing of the door body assembly; at the same time, it can achieve slow door closing, greatly reducing the noise when closing the door; and achieve a compact structure and stable operation; and the automatic door closing mechanism of the present invention has extremely high versatility, and its structure is easy to process, thereby reducing production costs.

[0133] Thus far, some specific embodiments of the present invention have been described in detail by way of examples. However, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An automatic door closing mechanism, characterized in that: include: Door assembly (1); A fixed door hook (4), the fixed door hook (4) being fixedly mounted on the door body assembly (1) and having a fixed door hook end (401) extending outward; as well as The door closing assembly (6) comprises: - an interlocking support seat (601), on which an interlocking support self-locking arm guide rail (601f) extending in the horizontal direction is provided, and an interlocking support self-locking arm locking portion (601g) is provided at the outer end of the interlocking support self-locking arm guide rail (601f), - an interlocking support upper cover (611), which can be combined with the interlocking support seat (601), - a movable chassis (612), which is arranged between the interlocking support seat (601) and the interlocking support upper cover (611), and the movable chassis (612) is movable in a horizontal direction relative to the interlocking support seat (601) and the interlocking support upper cover (611); - a tension spring (609), which is arranged between the interlocking support seat (601) and the interlocking support upper cover (611), one end of the tension spring (609) is fixedly mounted on the interlocking support seat (601), and the other end is fixedly connected to the movable chassis (612); In the door opening state, the movable chassis (612) is stopped by the interlocking support self-locking arm blocking portion (601g); in the door closing process, the fixed door hook end (401) can be combined with the movable chassis (612), and under the action of the tension spring (609), the fixed door hook (4) moves together with the movable chassis (612) in the door closing direction. The movable chassis (612) includes: A locking rocker (612h) and a self-locking rocker (612d) rotatably mounted in the housing of the movable chassis (612); a driving arm (612j) capable of moving in an up-down direction, wherein the driving arm (612j) is movably connected to one end of the locking rocker (612h) and one end of the self-locking rocker (612d); a self-locking arm (612c) capable of moving in an up-down direction, the self-locking arm (612c) being movably connected to the other end of the self-locking rocker (612d); a locking arm (612i) capable of moving in an up-down direction, wherein the locking arm (612i) is movably connected to the other end of the locking rocker (612h); and a chassis compression spring (612e), one end of which is fixedly connected to the lower end surface of the driving arm (612j), and the other end of which is slidably abutted against the inner wall surface of the movable chassis (612). The driving arm (612j) is movably connected to one end of the locking rocker (612h) and one end of the self-locking rocker (612d) via a first rotating shaft (612a); the self-locking arm (612c) is movably connected to the self-locking rocker (612d) via a second rotating shaft (612b); and the locking arm (612i) is movably connected to the locking rocker (612h) via a third rotating shaft (612g).

2. The automatic door closing mechanism according to claim 1, characterized in that: The shell of the movable chassis (612) is composed of a chassis lower shell (612f) and a chassis upper shell (612k) that can be combined with each other; a positioning hole aligned with the driving arm (612j) is provided in the top wall surface of the chassis upper shell (612k), and the driving arm (612j) can move upward through the positioning hole aligned with the driving arm (612j); a positioning hole aligned with the self-locking arm (612c) is provided in the bottom wall surface of the chassis lower shell (612f), and the self-locking arm (612c) can move downward through the positioning hole aligned with the self-locking arm (612c); a positioning hole aligned with the locking arm (612i) is provided in the top wall surface of the chassis upper shell (612k), and the locking arm (612i) can move upward through the positioning hole aligned with the locking arm (612i).

3. The automatic door closing mechanism according to claim 2, characterized in that: The fixed door hook end (401) comprises: A first fixed door hook driving surface (401a), wherein the first fixed door hook driving surface (401a) is arranged at an inclined angle; a second fixed door hook driving surface (401b), the second fixed door hook driving surface (401b) being arranged on the bottom edge side of the fixed door hook end (401); a third fixed door hook driving surface (401c), the third fixed door hook driving surface (401c) being arranged on the inner edge side of the fixed door hook hook end (401); a fourth fixed door hook driving surface (401d), the fourth fixed door hook driving surface (401d) being arranged on the outer edge side of the fixed door hook end (401), Wherein, the first fixed door hook driving surface (401a) is arranged between the second fixed door hook driving surface (401b) and the fourth fixed door hook driving surface (401d).

4. The automatic door closing mechanism according to claim 3, characterized in that: The door closing assembly (6) further includes a damper (610), and the movable chassis (612) further includes a damper locking portion (612p); as the movable chassis (612) moves, the damper locking portion (612p) can contact the movable end of the damper (610).

5. The automatic door closing mechanism according to claim 4, characterized in that: The automatic door closing mechanism further comprises a movable door hook (2) and a door hook tension spring (3), wherein the movable door hook (2) is slidably mounted in the fixed door hook (4); one end of the door hook tension spring (3) is connected to the movable door hook (2), and the other end of the door hook tension spring (3) is connected to the door body assembly (1).

6. The automatic door closing mechanism according to claim 5, characterized in that: The movable door hook (2) comprises an outwardly extending movable door hook hook end (204), the movable door hook hook end (204) being formed into a bent hook portion and having a first movable door hook inclined surface (204a) on the outer edge side and a second movable door hook inclined surface (204b) on the inner side; the interlocking support seat (601) is further provided with a first interlocking support movable door hook ramp (601d) extending in an oblique upward direction and a second interlocking support movable door hook ramp (601e) extending in an oblique downward direction continuous with the first interlocking support movable door hook ramp (601d); during the door closing process, the first movable door hook inclined surface (204a) contacts the first interlocking support movable door hook ramp (601d), or the second movable door hook inclined surface (204b) contacts the second interlocking support movable door hook ramp (601e).

7. The automatic door closing mechanism according to claim 6, characterized in that: The door closing assembly (6) further comprises between the interlocking support seat (601) and the interlocking support upper cover (611): a driving rack (608), wherein the driving rack (608) is movable in a horizontal direction, and during the door closing process, the fourth fixed door hook driving surface (401d) of the fixed door hook end (401) is capable of contacting the driving rack (608); A gear (605), wherein the driving rack (608) is meshed with the gear (605) for transmission; A driven rack (604), wherein the driven rack (604) is capable of moving in a horizontal direction, and the gear (605) is meshed with the driven rack (604) for transmission; A rack tension spring (603), one end of which is fixed on the interlocking support seat (601), and the other end of which is fixedly connected to the driven rack (604).

8. The automatic door closing mechanism according to claim 7, characterized in that: The door closing assembly (6) further comprises: a first micro switch (602), a second micro switch (606) and a third micro switch (607); when the door body assembly (1) is in a fully closed position, the first micro switch (602) is triggered by the first movable door hook inclined surface (204a), and the second micro switch (606) and the third micro switch (607) are triggered by the driven rack (604).

9. A cooking utensil, characterized in that: The invention comprises the automatic door closing mechanism according to any one of claims 1 to 8.

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