CN217269680U - Door opening structure and electric appliance - Google Patents

Abstract

The utility model provides a structure of opening door includes two sets of mechanisms of opening door, one set the mechanism of opening door be used for with the same one side of first door and second door is rotationally established in step on the box, another set the mechanism of opening door be used for with the opposite side of first door and second door is rotationally established in step on the box. Any set of door opening mechanism includes first connecting piece, second connecting piece and stay cord, and the one end of stay cord is fixed on the first connecting piece and the other end is fixed on the second connecting piece. The two sets of door opening mechanisms also respectively comprise a plurality of steering positioning pieces which are fixed on the box body and used for winding the pull rope. When the door is opened or closed, the first door or the second door rotates to force one set of the pull ropes of the door opening mechanism, namely the first pull rope, to be in a tensioning state and the other set of the pull ropes of the door opening mechanism, namely the second pull rope, to be in a loosening state. The utility model has the advantages of simple lightweight, stable transmission, convenient installation, reliability and short remodeling fast period.

Description

Door opening structure and electric appliance

Technical Field

The utility model belongs to the technical field of the life and specifically relates to a structure and electrical apparatus open door.

Background

At present, most of door opening structures and electrical appliances are designed to be single doors, and the door opening structures and the electrical appliances occupy more space in front after being opened, so that the door opening structures and the electrical appliances are inconvenient to use by families with small kitchen area and short space. The design of upper and lower double doors is also adopted, but the door opening mode of the double-door opening machine mostly adopts a link mechanism, the structure is complex, the installation is inconvenient, the manufacturing cost is high, after the size of the door opening structure and the size of an electric appliance are changed, the production process needs to be redesigned by a connecting rod, the period is long, and therefore the double-door opening machine is difficult to rapidly convert, in addition, the link mechanism can vibrate and impact when the door is opened, the weight of the door opening structure and the weight of the electric appliance are increased by a metal connecting rod, and the desk machine is very heavy.

Therefore, it is necessary to provide a new door opening structure and an electric appliance to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a structure and electrical apparatus open door, it is including connecting the mechanism of opening door between door plant and main part, the mechanism of opening door has simple lightweight, the transmission is steady, simple to operate is reliable and the quick short advantage of period of remodeling.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a door opening structure is used between a box body and a double door, wherein the double door comprises a first door and a second door which can be sequentially distributed on an opening of the box body; the method is characterized in that: the door opening structure comprises two sets of door opening mechanisms, one set of door opening mechanism is used for synchronously and rotatably arranging the same sides of the first door and the second door on the box body, and the other set of door opening mechanism is used for synchronously and rotatably arranging the other sides of the first door and the second door on the box body; any set of the door opening mechanism comprises a first connecting piece, the first connecting piece is rotatably arranged on the box body through a first rotating shaft, and one end of the first connecting piece is fixedly connected with the first door; the second connecting piece is rotatably arranged on the box body through a second rotating shaft, and one end of the second connecting piece is fixedly connected with the second door; one end of the pull rope is fixed on the first connecting piece, and the other end of the pull rope is fixed on the second connecting piece; the two sets of door opening mechanisms also respectively comprise a plurality of steering positioning pieces which are fixed on the box body and are used for winding the pull rope, and the number of the steering positioning pieces on one set of door opening mechanism is at least one odd number more than that of the steering positioning pieces on the other set of door opening mechanism; when the door is opened or closed, the first door or the second door rotates to force one set of the pull ropes of the door opening mechanism, namely the first pull rope, to be in a tensioning state and the other set of the pull ropes of the door opening mechanism, namely the second pull rope, to be in a loosening state.

As a further improved technical proposal of the utility model, the steering positioning piece is a fixed pulley.

As the utility model discloses further modified technical scheme, one set the fixed pulley on the mechanism of opening the door is two and another set the fixed pulley on the mechanism of opening the door is one.

As the utility model discloses further modified technical scheme, one set the relative both sides of line, another set between first pivot and second pivot of two fixed pulley settings in the mechanism of opening the door the line is kept away from that one side of two divisions of doors between first pivot and second pivot to a fixed pulley setting in the mechanism of opening the door, makes two the stay cord is in different tensioning condition or lax state.

As the utility model discloses further improved technical scheme, this one set the first stay cord of mechanism of opening the door supports and leans on these two one of them fixed pulley also is first fixed pulley for two distal end sides of opening the door and support and lean on the other fixed pulley in these two fixed pulleys also the second fixed pulley for two near-end sides of opening the door, this another set the second stay cord of mechanism of opening the door supports and leans on this one the fixed pulley also is the third fixed pulley for two distal end sides of opening the door.

As a further improved technical solution of the present invention, any set of the door opening mechanism includes at least one energy storage spring, and two ends of the energy storage spring are respectively disposed on the box body and the first connecting piece or the second connecting piece; when the door is opened, the energy storage spring is driven by the rotation of the first connecting piece or the second connecting piece to be stretched to store energy; when the door is closed, the energy storage spring releases energy to force the first door and the second door to tend to close on the opening of the box body.

As a further improved technical proposal of the utility model, the energy storage device also comprises a first convex column and a second convex column which are respectively arranged on the outer side wall of the first connecting piece where the energy storage spring is arranged and the box body; two ends of the energy storage spring are respectively fixed on the first convex column and the second convex column.

As the utility model discloses further modified technical scheme, first connecting piece includes arc portion, arc portion supplies energy storage spring's one end installation.

As a further improved technical solution of the present invention, the first door is located above the second door; any set the mechanism of opening door still is including establishing locating part on the box lateral wall, the locating part is located on the rotation route of second connecting piece, so that when supplying first door opening door rotates, the lateral wall of second connecting piece is blockked on the locating part.

As a further improved technical proposal of the utility model, the electric appliance comprises the door opening structure; a case having an opening; the first door and the second door are rotatably arranged on the opening through the door opening structure so as to switch between closing the opening and opening the opening; in a closed state, the first gate and the second gate are distributed in sequence; in an open state, the first door is stacked on the second door.

Compared with the prior art, the utility model discloses door opening structure and electrical apparatus have realized opening simultaneously and closing simultaneously that the two open doors, and door opening structure's door opening mechanism is connected the transmission between first connecting piece and second connecting piece by the stay cord, and two sets of door opening mechanism still include a plurality of respectively fix on the box for the steering locating piece that the stay cord was twined, one set of steering locating piece on the door opening mechanism is than another set of steering locating piece on the door opening mechanism's quantity odd number of one at least more; when the door is opened or closed, the first door or the second door rotates to force one set of the pull ropes of the door opening mechanism, namely the first pull rope, to be in a tensioning state and the other set of the pull ropes of the door opening mechanism, namely the second pull rope, to be in a loosening state.

Drawings

Fig. 1 is a left side schematic structural view of the closing state of the electric appliance of the present invention;

fig. 2 is a right side schematic view of the electrical appliance in a door closing state according to the present invention;

FIG. 3 is a schematic view of the left side structure of the electric appliance according to the present invention in the open state;

FIG. 4 is a right side schematic view of the electrical apparatus of the present invention in the open state;

fig. 5 to 8 are schematic diagrams of cartesian coordinate systems established by using the left first pulley and the right pulley as the origin respectively when the left and right door opening mechanisms of the present invention are in a closed state and a door opened state;

fig. 9 is a position relationship diagram of a distance d1 from a connection point of the right pulling rope and the right upper hinge plate to the right upper rotating shaft, a distance d2 from a connection point of the right pulling rope and the right lower hinge plate to the right lower rotating shaft, a rotation angle w1 of the right upper hinge plate and a rotation angle w2 of the right lower hinge plate when the upper door panel and the lower door panel of the present invention are opened simultaneously;

fig. 10 is a position relationship diagram of the distance d1 from the connection point of the right pulling rope and the upper right flap to the upper right rotating shaft, the distance d2 from the connection point of the right pulling rope and the lower right flap to the lower right rotating shaft, the rotating angle w1 of the upper right flap and the rotating angle w2 of the lower right flap when the upper and lower door panels of the present invention are closed simultaneously.

Detailed Description

Referring to fig. 1 to 10, a door opening structure is used between a cabinet 1 and a double door 2, wherein the double door 2 includes a first door 20 and a second door 21 that may be sequentially disposed on an opening of the cabinet 1. The structure of opening the door includes two sets of mechanisms of opening the door 31, 32, and one of them set (first set) mechanism of opening the door 31 be used for with the same one side (left side) of first door 20 and second door 21 is rotationally established in step on the box 1, another set (second set) mechanism of opening the door 32 be used for with the opposite side (right side) of first door 20 and second door 21 is rotationally established in step on the box 1. The two sets of door opening mechanisms 31 and 32 cooperate to open or close the double door 2 relative to the box body 1 simultaneously.

Any one set (the first set and the second set) of door opening mechanisms respectively comprises a first connecting piece, a second connecting piece and a pull rope. A first connecting piece 314 in the first set of door opening mechanism 31 (left door opening mechanism) is rotatably arranged on the box body 1 through a first rotating shaft 315, and one end of the first connecting piece 314 is fixedly connected with the first door 20; the second connecting piece 316 is rotatably arranged on the box body 1 through a second rotating shaft 317, and one end of the second connecting piece 316 is fixedly connected with the second door 21; one end of the pull cord 312 is fixed to the first connector 314 and the other end is fixed to the second connector 316. Correspondingly, a first connecting piece 324 in the second set of door opening mechanism 32 (right door opening mechanism) is rotatably arranged on the box body 1 through a first rotating shaft 325, and one end of the first connecting piece 324 is fixedly connected with the first door 20; a second connecting member 326 is rotatably disposed on the box 1 through a second rotating shaft 327, and one end of the second connecting member 326 is fixedly connected to the second door 21; one end of the pull cord 322 is secured to the first connector 324 and the other end is secured to the second connector 326.

The two sets of door opening mechanisms also respectively comprise a plurality of steering positioning pieces which are fixed on the box body 1 and used for winding the pull rope. The number of the steering positioning members on the first set of door opening mechanism 31 is at least one more than that of the steering positioning members on the second set of door opening mechanism 32, so that when the door is opened or closed, the first door 20 or the second door 21 rotates to force the pull rope of the first set of door opening mechanism 31, i.e. the first pull rope 312, to be in a tensioned state and the pull rope of the second set of door opening mechanism 32, i.e. the second pull rope 322, to be in a relaxed state. The stay cords on the left side and the right side are in different states, so that the acting force generated by the stay cord on one side can be ensured to be generated in the opening and closing processes, and the mutual interference can be avoided.

In an embodiment of the present invention, the steering positioning member is a fixed pulley. Specifically, there are two fixed pulleys 318 on the first set of door opening mechanisms 31 and one fixed pulley 328 on the second set of door opening mechanisms 32. Because the two fixed pulleys 318 (including the first fixed pulley 319 and the second fixed pulley 320) of the first set of door opening mechanism 31 are disposed on opposite sides of a connecting line between the first rotating shaft 315 and the second rotating shaft 317, and one fixed pulley 328 (defined as the third fixed pulley 328) of the second set of door opening mechanism 32 is disposed on a side of the connecting line between the first rotating shaft 325 and the second rotating shaft 327 away from the double door 2, the two pulling ropes 312 and 322 are in different tensioning states or slack states, that is, the second pulling rope 322 is in a slack state when the first pulling rope 312 is in the tensioning state, and the first pulling rope 312 is in a slack state when the second pulling rope 322 is in the tensioning state. In another embodiment, the steering positioning member may be a convex hull formed on the housing 1.

The first pulling rope 312 of the first set of door opening mechanism 31 abuts against the distal side of one of the two fixed pulleys 318, i.e., the first fixed pulley 319, with respect to the double door 2, and the first pulling rope 312 abuts against the proximal side of the other of the two fixed pulleys 318, i.e., the second fixed pulley 320, with respect to the double door 2. The second rope 322 of the second set of door opening mechanisms 32 abuts against the distal side of the one fixed pulley, that is, the third fixed pulley 328, with respect to the double door 2. Therefore, the utility model can ensure that the first pull rope 312 on one side (for example, the left side) is tensioned to generate a pulling force effect and the second pull rope 322 on the other side (the right side) does not generate a force effect because of the looseness in the door opening process; in contrast, during the door closing process, the second rope 322 on the other side (right side) is pulled to generate a pulling force, and the first rope 312 on the one side (left side) does not generate a force because of the slack. In summary, only one of the pull cords (the first pull cord 312 or the second pull cord 322) has a tension rebound effect during opening or closing of the door, and the pull cord in a relaxed state does not provide the tension rebound effect.

Any set of the door opening mechanism comprises at least one energy storage spring 310/329, two ends of the energy storage spring 310 are respectively arranged on the box body 1 and the first connecting piece 314/324, or two ends of the energy storage spring 329 are respectively arranged on the box body 1 and the second connecting piece 316/326. When the door is opened, the energy storage spring 310/329 is driven by the rotation of the first connecting piece 314/324 or the second connecting piece 316/326 to be stretched to store energy; when the door is closed, the energy storage spring 310/329 releases energy to force the first door 20 and the second door 21 to tend to close on the opening of the box body 1. The energy storage spring provides a driving force for the tension rebound of the first pull cord 312 or the second pull cord 322.

The utility model discloses still include first projection 12 and second projection 13, first projection 12 is established on the lateral wall of first connecting piece 314/324, second projection 13 is established on the box 1, energy storage spring 310/329's both ends are fixed respectively first projection 12 with on the second projection 13. In particular, the first connectors 314/324 each include an arc (not numbered) for mounting one end of the energy storage spring 310/329, the arc is formed substantially on an outer circle centered on the first rotation axis 315/325 so that the first post 12 on the arc can rotate relative to the first rotation axis 315/325 away from the second post 13, and the energy storage spring 310/329 is extended to have elastic force; the elastic force of the energy storage spring 310/329 is released and the arc rotates in the opposite direction so that the first boss 12 on the arc can be relatively close to the second boss 13.

In a specific embodiment, the first door 20 is located above the second door 21; any set the mechanism of opening door still including establishing locating part 14 on the box 1 lateral wall, the locating part is located the rotation route of second connecting piece 316/326, so that when first door 20 opened the door and rotated, the lateral wall of second connecting piece 316/326 was blockked on the locating part.

The utility model discloses still relate to an electrical apparatus, include as above structure, box 1, first door 20 and the second door 21 of opening the door. The case 1 has an opening. The first door 20 and the second door 21 are rotatably provided on the opening by the door opening structure to switch between closing the opening and opening the opening. In the closed state, the first door 20 and the second door 21 are distributed in sequence; in the opened state, the first door 20 is stacked on the second door 21.

In the present invention, the first connecting member 314 and the first rotating shaft 315 on the upper side and the left side may be collectively referred to as an upper door left hinge 313, the second connecting member 316 and the second rotating shaft 317 on the lower side and the left side may be collectively referred to as a lower door left hinge 311, the first connecting member 324 and the first rotating shaft 325 on the upper side and the right side may be collectively referred to as an upper door right hinge 323, and the second connecting member 326 and the second rotating shaft 327 on the lower side and the right side may be collectively referred to as a lower door right hinge 321. The door opening mechanism on which side (left side or right side) ensures the opening or closing of the door is determined by pulling the upper first door 20 or the lower second door 21, and both the door opening and closing modes of pulling the first door 20 or the second door 21 are available in the scheme. When the second door 21 is pulled to open or close the door, the right second rope 322 is activated when the door is opened, and the left first rope 312 is activated when the door is closed. In contrast, when the first door 20 is pulled to open or close the door, the first pull cord 312 on the left side is operated to open the door, and the second pull cord 322 on the right side is operated to close the door.

The following description will be made in detail by taking an example of the door opening and closing operation by pulling the lower second door 21:

when the door is opened, the lower second door 21 is pulled at first, the second door 21 rotates to drive the lower door right hinge 321 to rotate, the lower door right hinge 321 drives the right second pull rope 322, the second pull rope 322 accordingly drives the upper door right hinge 323 to rotate, the upper door right hinge 323 drives the first door 20 to rotate, the upper first door 20 is also driven to a desired position, the upper door and the lower door are synchronously folded and opened in the door opening process, and the effect after the door is opened is shown in fig. 3 and 4; when the door is closed, the lower second door 21 is pulled first, the second door 21 rotates to drive the lower left door hinge 311 to rotate, the lower left door hinge 311 drives the left first pull rope 312, the first pull rope 312 drives the upper left door hinge 313 to rotate, the upper left door hinge 313 drives the first door 20 to rotate, the upper first door 20 is also driven to a desired position, the upper and lower doors are synchronously closed in the door opening process, and the effect after the doors are closed is shown in fig. 1 and 2.

It should be specifically noted that, in order to implement synchronous upper and lower door rotation angles, the distance d1 between the second rope 322 fixed at the lower door right hinge 321 and the lower door right hinge 321 rotation axis and the distance d2 between the second rope 322 fixed at the upper door right hinge 323 and the lower door right hinge 321 rotation axis and the entire lower door right hinge 321 rotation angle w1 and the upper door right hinge 323 rotation angle w2 need to satisfy the relation d1 w1 w2 w2, in this specific embodiment, d1 w2 is selected, so w1 w2, specifically refer to fig. 9 and fig. 10.

It should be specifically noted that, as shown in fig. 5 to 8, to realize stable transmission of the pull rope, it is necessary to ensure that the arrangement of the fixed pulley on the right side satisfies a certain condition, specifically, a cartesian coordinate system with the fixed pulley 328 on the right side as an origin, and the second pull rope 322 on the right side is located in a first quadrant defined by "X + Y" and a third quadrant defined by "X '+ Y'; the fixed pulley 318 on the left side is also disposed to satisfy a certain relationship, a cartesian coordinate system is established with the center of the first fixed pulley 319 close to the left hinge 313 on the upper door as an origin, the first rope 312 on the left side is always in the first quadrant defined by "X + Y" and the fourth quadrant defined by "X + Y'" during the closing process, and the second fixed pulley 320 is to ensure that the small section of rope at the connection with the left hinge 311 on the lower door is in the vertical state when the upper and lower doors are fully opened (refer to fig. 7 in particular).

The utility model discloses structure 3 and electrical apparatus 100 that opens door is equipped with two sets of mechanisms of opening door 31, 32, first set of mechanism of opening door 31 is used for rotationally establishing on the left side wall of box 1 with the same one side synchronization of two opening doors 2, second set of mechanism of opening door 32 is used for rotationally establishing on the right side wall of box 1 with the opposite side synchronization of two opening doors 2, each set of mechanism of opening door 31/32 all includes first connecting piece 314/324, second connecting piece 316/326 and connect at first connecting piece 314/324, stay cord 312/322 between the second connecting piece 316/326. The first connecting piece 314/324 is rotatably arranged on the box body 1 through a first rotating shaft 315/325, and one end of the first connecting piece 314/324 is fixedly connected with the first door 21; the second connector 316/326 is rotatably installed on the cabinet 1 by a second rotating shaft 317/327, and one end of the second connector 316/326 is fixedly connected to the second door 22. The two sets of door opening mechanisms further respectively comprise a plurality of steering positioning pieces which are fixed on the box body 1 and used for the pull rope 312/322 to wind, and the number of the steering positioning pieces on the first set of door opening mechanism 31 is at least one more odd number than that of the steering positioning pieces on the second set of door opening mechanism 32. When the door is opened or closed, the first door 20 or the second door 21 rotates to force the first pulling rope 312 of the first set of door opening mechanisms 31 to be in a tensioned state and the second pulling rope 322 of the second set of door opening mechanisms 32 to be in a relaxed state. The utility model discloses opening and closing simultaneously when opening structure 3 and electrical apparatus 100 realized two opening door 2, opening structure 3's mechanism 31/32 of opening door is connected between first connecting piece 314/324 and second connecting piece 316/326 and the transmission by stay cord 312/322, has simple lightweight, the transmission is steady, simple to operate is reliable and the quick short advantage of period of remodeling.

The above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and the understanding of the present specification should be based on the technical people in the related art, for example, the descriptions of the directions such as "front", "back", "left", "right", "up", "down", etc., although the present specification has described the present invention in detail with reference to the above embodiments, the ordinary skilled in the art should understand that the technical people in the related art can still modify or substitute the present invention, and all the technical solutions and modifications thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims (10)

1. A door opening structure is used between a box body (1) and a double door (2), wherein the double door (2) comprises a first door (20) and a second door (21) which can be sequentially distributed on an opening of the box body (1); the method is characterized in that: the door opening structure comprises

The door opening mechanism (31) is used for synchronously and rotatably arranging the same side of the first door (20) and the second door (21) on the box body (1), and the door opening mechanism (32) is used for synchronously and rotatably arranging the other side of the first door (20) and the other side of the second door (21) on the box body (1);

any set of the door opening mechanisms (31/32) comprises

The first connecting piece (314/324) is rotatably arranged on the box body (1) through a first rotating shaft (315/325), and one end of the first connecting piece is fixedly connected with the first door (20);

a second connector (316/326) rotatably disposed on the cabinet (1) via a second shaft (317/327), one end of which is fixedly connected to the second door (21);

a pull cord (312/322) having one end fixed to the first connector (314/324) and the other end fixed to the second connector (316/326);

the door opening mechanism is characterized in that the two sets of door opening mechanisms (31/32) also respectively comprise a plurality of steering positioning pieces which are fixed on the box body (1) and are used for the rope (312/322) to wind, and the number of the steering positioning pieces on one set of door opening mechanism (31) is at least one odd number more than that of the steering positioning pieces on the other set of door opening mechanism (32);

when the door is opened or closed, the first door (20) or the second door (21) rotates, so that the pull ropes of one set of the door opening mechanism (31), namely the first pull rope (312), are forced to be in a tensioning state, and the pull ropes of the other set of the door opening mechanism (32), namely the second pull rope (322), are forced to be in a loosening state.

2. The door opening structure of claim 1, wherein: the steering positioning piece is a fixed pulley.

3. The door opening structure according to claim 2, wherein: the number of the fixed pulleys (318) on one set of the door opening mechanism (31) is two, and the number of the fixed pulleys (328) on the other set of the door opening mechanism (32) is one.

4. The door opening structure according to claim 3, wherein: one set two fixed pulley (318) on the mechanism of opening the door (31) set up the relative both sides of line between first pivot (315) and second pivot (317), another set fixed pulley (328) on the mechanism of opening the door (32) set up between first pivot (325) and second pivot (327) that the line was kept away from and is opened door (2) that one side, make two stay cord (312, 322) are in different tensioning state or lax state.

5. The door opening structure according to claim 4, wherein: this one set the first stay cord (312) of mechanism of opening door (31) supports and leans on these two one of them fixed pulley (319) is also first fixed pulley (319) for the distal end side of opening door (2) and support and lean on the other fixed pulley in these two fixed pulleys (318) is also the near-end side of second fixed pulley (320) for opening door (2), this another set the second stay cord (322) of mechanism of opening door (32) supports and leans on this one the fixed pulley is also the distal end side of third fixed pulley (328) for opening door (2).

6. The door opening structure according to any one of claims 1 to 5, wherein: any set of the door opening mechanism comprises at least one energy storage spring (310/329), and two ends of the energy storage spring (310/329) are respectively arranged on the box body (1) and the first connecting piece (314/324) or the second connecting piece (316/326);

when the door is opened, the energy storage spring (310/329) is driven by the rotation of the first connecting piece (314/324) or the second connecting piece (316/326) to be stretched to store energy; when the door is closed, the energy storage spring (310/329) releases energy to force the first door (20) and the second door (21) to tend to close on the opening of the box body (1).

7. The door opening structure according to claim 6, wherein: the energy storage device is characterized by further comprising a first convex column (12) and a second convex column (13), wherein the first convex column and the second convex column are respectively arranged on the outer side wall of a first connecting piece (314/324) where the energy storage spring (310/329) is located and the box body (1);

two ends of the energy storage spring (310/329) are respectively fixed on the first convex column (12) and the second convex column (13).

8. The door opening structure of claim 6, wherein: the first connector (314/324) includes an arcuate portion for mounting one end of the energy storage spring (310/329).

9. The door opening structure according to any one of claims 1 to 5, wherein: the first door (20) is located above the second door (21);

any set of mechanism of opening door still including establishing locating part (14) on box (1) lateral wall, the locating part is located the rotation route of second connecting piece (316/326) for when first door (20) open the door and rotate, the lateral wall of second connecting piece (316/326) is stopped on the locating part.

10. An electrical appliance, characterized by: comprises that

A case (1) having an opening;

the door opening structure of any one of claims 1 to 9;

a first door (20) and a second door (21) rotatably provided on the opening by the door opening structure to switch between closing the opening and opening the opening;

in the closed state, the first door (20) and the second door (21) are distributed in sequence; in the open state, the first door (20) is stacked on the second door (21).

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