Inner drum door of washing machine

Abstract

The utility model relates to a washing machine inner barrel door, and relates to the technical field of washing machines, the washing machine inner barrel door comprises an inner door and an outer door, the inner door and the outer door are opened and locked through a door lock, the door lock comprises a bolt, a fixing mechanism, a locking mechanism, a positioning mechanism, a limiting moving mechanism and a key, and the key is inserted in a key hole of the bolt. The bolt is connected with the outer side face of the outer door through a fixing mechanism, a limiting moving mechanism, a locking mechanism and a positioning mechanism are sequentially arranged in the length direction of the bolt, and the key hole is used in cooperation with the locking mechanism. The device has the effects that the door unlocking mode is simple, movement is accurate in the door unlocking process of the bolt, and mistaken touch door locking is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of washing machines, in particular to a washing machine inner drum door. BACKGROUND

[0002] Common washing machines are divided into side-opening doors and top-opening doors. In industrial washing, in order to facilitate the rapid automatic entry and exit of clothes, the side-opening door is generally used. With the improvement of the hygiene conditions of industrial washing machines, such as the washing of hospital environments, the isolation of contaminated areas and clean areas has high requirements. It is difficult to meet such washing environments by using the same door to both enter unwashed clothes and exit washed clothes. Therefore, the promotion of top-opening industrial washing machines has become popular, that is, the top of the industrial washing machine is used for feeding, and the side of the industrial washing machine is used for discharging.

[0003] The related technology discloses a top feeding washing machine opening and closing device in a Chinese patent with the publication number CN221778145U, which provides a door lock for the opening and closing door of the top feeding washing machine to meet the requirements in different processes of feeding and washing. The outer drum is provided with a first feeding port at the top, the inner drum is provided with a second feeding port at the top, and the inner drum is coaxially arranged in the outer drum. The top door is slidably connected to the outer drum in the horizontal direction, and the horizontal sliding of the top door opens or closes the first feeding port of the outer drum. The end cover is fixed to the end of the inner drum, and the locking groove is formed in the end cover. Two hinged doors are arranged at the position of the second feeding port of the inner drum, and the two hinged doors are hinged to the inner drum through the hinge elements arranged along the generatrix of the inner drum. The locking plate is arranged between the two hinged doors and fixed to the outer side wall of one of the hinged doors. The driving assembly is arranged on the locking plate, and the locking pins are connected to the two ends of the driving assembly along the length direction of the hinged door. The end of the locking pin is matched with the locking groove. The driving assembly is used to drive the end of the locking pin to slide into the locking groove. After the clothes enter the inner drum, the top door is slid to close the outer drum, the hinged doors are rotated along the hinge elements to close the inner drum, and the driving assembly drives the locking pin to slide until the end of the locking pin is inserted into the locking groove. The locking pin is connected between the hinged door and the end cover of the inner drum to quickly realize the stable locking of the hinged door.

[0004] According to the related technology in the above, the two ends of the locking pin are driven to slide in and out of the locking groove by the driving assembly, so as to realize the locking or opening of the two ends of the two hinged doors of the inner drum. However, the above-mentioned door lock has the problems that the stroke of the locking pin is not accurate, the locking pin is easy to deviate from the locking groove on the hinged door, the door cannot be locked, and the door is easy to be locked by mistake. Practical new type content

[0005] In order to solve the above technical problems, the present application provides a washing machine inner drum door.

[0006] The washing machine inner drum door provided by the application adopts the following technical scheme:

[0007] The washing machine inner drum door comprises an inner door and an outer door, the inner door and the outer door are opened and locked by a door lock, the door lock comprises a bolt, a fixing mechanism, a locking mechanism, a positioning mechanism, a limiting movement mechanism and a key, the key is inserted into a key hole of the bolt, the bolt is connected to the outer side surface of the outer door through the fixing mechanism, the limiting movement mechanism, the locking mechanism and the positioning mechanism are sequentially arranged in the length direction of the bolt, and the key hole is used in cooperation with the locking mechanism.

[0008] By adopting the above technical scheme, the bolt lock is adopted to quickly open and lock the door, the cooperation of the locking mechanism and the key can realize the normal movement process of the door locking, the positioning mechanism can position the movement process of the bolt, the extension and contraction of the bolt can be smoothly positioned and moved between the bolt holes, the pin holes, the inner door and the outer door, and the limiting movement mechanism is used to prevent the bolt from being accidentally touched in the state without locking the door. That is, the opening and locking door mode is simple, the movement of the bolt in the opening and locking door process is accurate, and the accidental touch of the door is prevented.

[0009] Optionally, the locking mechanism comprises a plug-in cylinder, a through slot and a pull hole matched with the key hole are formed in the plug-in cylinder, the through slot and the pull hole are communicated, the opening size of the pull hole is greater than the opening width of the through slot, the opening size of the key hole is matched with the opening size of the pull hole, a ring groove is formed in one end of the key inserted into the key hole, and the key is limited to be pulled out in the through slot.

[0010] By adopting the above technical scheme, the key can be pulled out only in the state that the door is locked, that is, the key hole is aligned with the pull hole, and the key cannot be pulled out when the key hole is in the corresponding positions of the through slot and the ring groove.

[0011] Optionally, an extension slot is extended from one end of the through slot away from the pull hole, the length direction of the extension slot is perpendicular to the length direction of the through slot, the key slides in the through slot and the extension slot through the ring groove, and the key is limited to be pulled out in the extension slot.

[0012] By adopting the above technical scheme, the through slot and the extension slot are arranged to realize the positioning movement of the positioning mechanism.

[0013] Optionally, the fixing mechanism comprises a first fixed plate, a second fixed plate and a third fixed plate, the first fixed plate, the second fixed plate and the third fixed plate are arranged in parallel and at intervals on the outer side surface of the outer door, the limiting movement mechanism is installed between the first fixed plate and the second fixed plate, the locking mechanism and the positioning mechanism are arranged between the second fixed plate and the third fixed plate, and bolt holes are respectively formed in the first fixed plate, the second fixed plate and the third fixed plate, and the bolt respectively passes through the three bolt holes to lock one end of the inner door and the outer door.

[0014] By adopting the technical scheme, the main function of the fixing mechanism is to provide support and installation for the door lock, and the third fixing plate also provides a cooperative effect on the positioning movement of the positioning mechanism.

[0015] Optionally, the positioning mechanism comprises a positioning pin, a positioning spring and a positioning slot, the positioning slot is arranged on the plug cylinder, the positioning spring is sleeved on the plug pin, the positioning pin is fixedly connected with the plug pin through the positioning slot, one end of the positioning spring is limited by the positioning pin, and the other end of the positioning spring is limited by the fixing mechanism.

[0016] By adopting the technical scheme, the positioning pin is fixed on the plug pin and moves directionally in the positioning slot, the directional movement of the plug pin is realized, and finally the plug pin is accurately and quickly inserted into the overlapping lock holes on the inner door and the outer door.

[0017] Optionally, the positioning slot is an L-shaped slot.

[0018] By adopting the technical scheme, the positioning pin realizes the extension and retraction action of the plug pin on the vertical long side of the L-shaped slot, realizes the rotation of the plug pin on the horizontal short side of the L-shaped slot, and further limits the extension and retraction action of the plug pin.

[0019] Optionally, the limiting movement mechanism comprises a protrusion, a pressing block, an extension and retraction piece, an extension and retraction connecting piece, a limiting piece and a top plate, the limiting piece is fixedly connected with the fixing mechanism, the vertical bottom of the protrusion is fixedly connected with the inner door, a protrusion hole is arranged on the outer door, the protrusion passes through the protrusion hole to the outer side of the outer door, the extension and retraction connecting piece reciprocates up and down in a limiting cavity formed by the limiting piece and the fixing mechanism, the top of the extension and retraction connecting piece is connected with the extension and retraction piece, the bottom of the extension and retraction connecting piece is connected with the pressing block, the pressing block is used in cooperation with the protrusion, the top plate is arranged on the top of the extension and retraction piece, the top plate is fixedly connected with the fixing mechanism, an annular limiting slot is arranged on the plug pin, and the pressing block enters the annular limiting slot under the action of the extension and retraction piece.

[0020] By adopting the technical scheme, when the plug pin is in the unlocking state, the protrusion and the pressing block are separated and do not contact, the pressing block pushes the extension and retraction connecting piece to move downward in the limiting cavity under the reset action of the extension and retraction piece, and finally the pressing block enters the annular limiting slot, so that the locking in the unlocking state is realized and the false locking is prevented.

[0021] Optionally, an arc-shaped slot is arranged on the protrusion, a semicircular slot is arranged on the pressing block, the arc-shaped slot and the semicircular slot are opposite to each other in opening to form a pin hole of the plug pin, and the hole area of the pin hole is greater than the cross-sectional area of the plug pin.

[0022] By adopting the technical scheme, the extension and retraction of the plug pin need to be performed between the protrusion and the pressing block, so the arc-shaped slot and the semicircular slot are arranged to meet the extension and retraction action of the plug pin, and the hole area of the pin hole is greater than the cross-sectional area of the plug pin to ensure the barrier-free extension and retraction of the plug pin.

[0023] Optionally, a pressing hole for pressing the telescopic part is formed on the top plate, the telescopic part includes a telescopic spring, an upper connecting column and a lower connecting column, one end of the lower connecting column is fixedly connected with the telescopic connecting part, the other end of the lower connecting column is connected with one end of the telescopic spring, the other end of the telescopic spring is connected with one end of the upper connecting column, and the other end of the upper connecting column is limited in the pressing hole.

[0024] By adopting the technical scheme, the top plate is used for limiting the telescopic part, the telescopic deformation of the telescopic part is applied to one end close to the pressing block, and the pressing block is lifted and moved downward, and the pressing hole is used for intuitively observing the position of the telescopic part.

[0025] To sum up, the application has at least one beneficial technical effect:

[0026] 1. The bolt lock is adopted to quickly open and lock the door, the cooperation of the locking mechanism and the key can realize the normal moving process of the door locking, the positioning mechanism can position the moving process of the bolt, the extension and retraction of the bolt can be smoothly positioned and moved between the bolt holes, the pin holes, the inner door and the outer door, and the limiting moving mechanism is used for preventing the bolt from being accidentally touched in the state without locking the door. That is, the opening and locking of the door is simple, the moving process of the bolt is accurate, and the accidental touch of the door is prevented.

[0027] 2. The key can be pulled out only in the state that the door is locked, that is, the key hole is aligned with the pull hole, and the key cannot be pulled out when the key hole is in the corresponding position of the through slot and the annular slot.

[0028] 3. The positioning pin is fixed on the bolt and directionally moves in the positioning slot, the directional movement of the bolt is realized, and finally the moving direction of the bolt is accurate and the bolt is quickly inserted into the overlapping lock hole of the inner door and the outer door. The positioning pin realizes the extension and retraction of the bolt on the vertical long side of the “L” type slot, realizes the rotation of the bolt on the horizontal short side of the “L” type slot, and further limits the extension and retraction of the bolt.

[0029] 4. When the bolt is in the unlocking state, the convex block is separated from the pressing block and does not contact, the pressing block is pushed downward in the limiting cavity under the resetting action of the telescopic part, and finally the pressing block enters the annular limiting slot, the locking in the unlocking state is realized, and the accidental locking is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic view of the overall structure of one end of a washing machine inner drum door.

[0031] Figure 2 It is a schematic view of the structure of the cooperation of the bolt and the limiting moving mechanism in the locked door state.

[0032] Figure 3 It is a schematic view of the structure of the cooperation of the bolt and the limiting moving mechanism in the unlocked door state.

[0033] Figure 4 is the overall structure diagram of the plug-in cylinder.

[0034] Reference signs: 1, outer door; 2, bolt; 3, key; 4, plug-in cylinder; 5, through slot; 6, second fixed plate; 7, third fixed plate; 8, positioning pin; 9, positioning spring; 10, positioning groove; 11, protrusion; 12, pressing block; 13, telescopic part; 14, telescopic connecting part; 15, limiting part; 16, top plate; 17, annular limiting groove; 18, keyhole; 19, pull hole; 20, extension groove. DETAILED DESCRIPTION

[0035] The application will be further described in detail below with reference to all the drawings.

[0036] The application discloses a washing machine inner drum door.

[0037] Reference Figure 1 A washing machine inner drum door comprises an inner door and an outer door 1, the inner door and the outer door 1 are opened and locked by a door lock, the door lock comprises a bolt 2, a fixing mechanism, a locking mechanism, a positioning mechanism, a limiting moving mechanism and a key 3, the key 3 is inserted into a keyhole 18 of the bolt 2, the bolt 2 is connected to the outer side of the outer door 1 through the fixing mechanism, the limiting moving mechanism, the locking mechanism and the positioning mechanism are sequentially arranged in the length direction of the bolt 2, and the keyhole 18 is used in cooperation with the locking mechanism. The inner door and the outer door 1 of the application are a part of an inner drum, the inner drum is a drum of a washing machine, the washing machine involved in the application is an industrial washing machine, material is discharged at one end of the drum, and material is fed at the top or one side of the washing machine, that is, the inner drum door in the application is a feeding door of the washing machine, and the inner door and the outer door 1 are respectively hinged to adjacent parts of the inner drum. The door lock described in the application is arranged on the outer side of the drum, and one end of the length of the drum or both ends of the length of the drum can be provided with one. The outer door 1 in the drawing only shows part of the structure at one end, the inner door overlaps the outer door, and the drawing does not show.

[0038] The locking mechanism comprises a plug-in cylinder 4, a through slot 5 and a pull hole 19 cooperating with the keyhole 18 are arranged on the plug-in cylinder 4, the through slot 5 and the pull hole 19 are communicated, the opening size of the pull hole 19 is larger than the opening width of the through slot 5, the opening size of the keyhole 18 matches the opening size of the pull hole 19, that is, the opening of the pull hole 19 is larger than the end size of the insertion end of the key 3 in the keyhole 18, the opening width of the through slot 5 is smaller than the end size of the insertion end of the key 3 in the keyhole 18, so that the insertion end of the key 3 is limited to be pulled out by the through slot 5 and can be pulled out at the position of the pull hole 19. The key 3 is provided with an annular groove at one end of the insertion end of the keyhole 18, and the key 3 is limited to be pulled out in the through slot 5. One end of the key 3 is inserted into the keyhole 18, and the end of the insertion end matches the size and shape of the keyhole 18, the keyhole 18 shown in the application is a cylinder, that is, the end of the insertion end of the key 3 is also a cylinder, and the key 3 inserted into the keyhole 18 can be basically fixed. When the key 3 is pulled out, it can only be pulled out when the key 3 slides to the position of the pull hole 19. The annular groove is arranged, so that the insertion end of the key 3 is divided into a large cylinder and a small cylinder, the end of the insertion end is a large cylinder, which is the part inserted into the keyhole 18, and the small cylinder is vertically above the large cylinder and cooperates with the opening of the through slot 5 and the extension slot 20.

[0039] The through slot 5 extends an extension slot 20 at one end away from the pull hole 19, the length direction of the extension slot 20 is perpendicular to the length direction of the through slot 5, the key 3 slides in the through slot 5 and the extension slot 20 through the annular groove, and the key 3 is limited to be pulled out in the extension slot 20. The opening width of the extension slot 20 can be consistent with or inconsistent with the opening width of the through slot 5, but the opening width of the extension slot 20 must be smaller than the end size of the insertion end of the key 3 in the keyhole 18, so as to limit the key 3 to be pulled out. The sliding channel formed by the combination of the through slot 5 and the extension slot 20 is consistent with the shape of the positioning groove 10.

[0040] Optionally, the fixing mechanism comprises a first fixing plate, a second fixing plate 6 and a third fixing plate 7, the first fixing plate, the second fixing plate 6 and the third fixing plate 7 are arranged in parallel and spaced apart on the outer side of the outer door 1, a limiting movement mechanism is arranged between the first fixing plate and the second fixing plate 6, the locking mechanism and the positioning mechanism are arranged between the second fixing plate 6 and the third fixing plate 7, and the first fixing plate, the second fixing plate 6 and the third fixing plate 7 are respectively provided with a bolt 2 hole, and the bolt 2 respectively passes through the three bolt 2 holes to lock one end of the inner door and the outer door 1. The first fixing plate provides a limiting bolt 2 path direction for the bolt 2 inserted into the lock hole of the inner door and the outer door 1, also provides a support for the top plate 16, and provides a relatively closed installation space for the limiting movement mechanism to avoid foreign matters from entering.

[0041] The positioning mechanism comprises a positioning pin 8, a positioning spring 9 and a positioning slot 10, the positioning slot 10 is arranged on the latch cylinder 4, the positioning spring 9 is sleeved on the latch bolt 2, the positioning pin 8 is fixedly connected with the latch bolt 2 through the positioning slot 10, one end of the positioning spring 9 is limited by the positioning pin 8, and the other end of the positioning spring 9 is limited by the fixing mechanism. The positioning slot 10 is an L-shaped slot.

[0042] The limiting movement mechanism comprises a protrusion 11, a pressing block 12, a telescopic part 13, a telescopic connecting part 14, a limiting part 15 and a top plate 16, the limiting part 15 is fixedly connected with the fixing mechanism, the vertical bottom of the protrusion 11 is fixedly connected with the inner door, the protrusion 11 hole is arranged on the outer door 1, the protrusion 11 enters the outer side of the outer door 1 through the protrusion 11 hole, the telescopic connecting part 14 reciprocates up and down in the limiting cavity formed by the limiting part 15 and the fixing mechanism, the top of the telescopic connecting part 14 is connected with the telescopic part 13, the bottom of the telescopic connecting part 14 is connected with the pressing block 12, the pressing block 12 is used in cooperation with the protrusion 11, the top plate 16 is arranged on the top of the telescopic part 13, the top plate 16 is fixedly connected with the fixing mechanism, the annular limiting slot 17 is arranged on the latch bolt 2, and the pressing block 12 enters the annular limiting slot 17 under the action of the telescopic part 13.

[0043] An arc-shaped slot is arranged on the protrusion 11, a semicircular slot is arranged on the pressing block 12, and the arc-shaped slot and the semicircular slot are opposite to each other to form the pin hole of the latch bolt 2.

[0044] A pressing hole for pressing the telescopic part 13 is arranged on the top plate 16, the telescopic part 13 comprises a telescopic spring, an upper connecting column and a lower connecting column, one end of the lower connecting column is fixedly connected with the telescopic connecting part 14, the other end of the lower connecting column is connected with one end of the telescopic spring, the other end of the telescopic spring is connected with one end of the upper connecting column, and the other end of the upper connecting column is limited in the pressing hole.

[0045] The key 3 of the application is also matched with a proximity switch, the proximity switch is arranged on the outer drum of the washing machine, the key 3 is pulled out and then is inserted into the position of the proximity switch, after the proximity switch senses the existence of the key 3, a signal is sent to the control system of the washing machine, and the washing machine can be started; otherwise, the washing machine cannot be started.

[0046] The principle of the embodiment of the application is that the key 3 is inserted into the hole 19, and then further inserted into the key hole 18 of the bolt 2, and the key 3 is pushed to slide in the through slot 5 into the extension slot 20, and the bolt 2 is driven to unlock, at the same time, the positioning pin 8 moves with the bolt 2, slides from one end to the other end of the positioning slot 10, and the positioning spring 9 is compressed, when the key 3 reaches the end of the extension slot 20, the positioning pin 8 synchronously reaches the end of the positioning slot 10, and the unlocking movement of the bolt 2 stops, and the inner door and the outer door 1 can be opened by being turned outwards. At the same time, the position of the annular limiting slot 17 of the bolt 2 corresponds to the position of the pressing block 12, the pressing block 12 is pushed down by the extension part 13, drives the extension connecting part 14 to move down, and the pressing block 12 is clamped in the annular limiting slot 17, so that the bolt 2 is clamped and limited to prevent being touched by mistake. When the inner door and the outer door 1 are closed, the protrusion 11 on the outer door 1 passes through the hole of the protrusion 11 on the inner door, and as the inner door and the outer door 1 are closed, the protrusion 11 pushes the pressing block 12 to move upwards, the pressing block 12 gradually separates from the annular limiting slot 17, drives the extension connecting part 14 to move upwards in the limiting cavity, and the bolt 2 returns to the slidable state, the key 3 is pulled to slide in the extension slot 20 towards the hole 19, and the positioning pin 8 moves with the bolt 2 and slides in the positioning slot 10. When the key 3 slides to the position of the hole 19, the bolt 2 slides to the lock hole on the inner door and the outer door 1. At this time, the key 3 can be pulled out, and is inserted into the proximity switch on the outer cylinder of the washing machine, the proximity switch sends a signal, and the washing machine can be normally started.

[0047] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so that: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A washing machine inner drum door, comprising an inner door and an outer door (1), wherein the inner door and the outer door (1) are opened and locked by a door lock, characterized in that: The door lock includes a bolt (2), a fixing mechanism, a locking mechanism, a positioning mechanism, a limiting movement mechanism, and a key (3). The key (3) is inserted into the key (3) hole of the bolt (2). The bolt (2) is connected to the outer side of the outer door (1) through the fixing mechanism. The limiting movement mechanism, the locking mechanism, and the positioning mechanism are arranged sequentially along the length of the bolt (2). The key (3) hole is used in conjunction with the locking mechanism.

2. The washing machine inner drum door according to claim 1, characterized in that: The locking mechanism includes a mortise lock cylinder (4), on which a through groove (5) and a pull hole (19) for use with the key (3) hole are provided. The through groove (5) and the pull hole (19) are connected. The opening size of the pull hole (19) is larger than the opening width of the through groove (5). The opening size of the key (3) hole matches the opening size of the pull hole (19). The key (3) has an annular groove on one end inserted into the key (3) hole. The key (3) is limited and pulled out in the through groove (5).

3. A washing machine inner drum door according to claim 2, characterized in that: The through groove (5) extends into an extension groove (20) at the end away from the pull hole (19). The length direction of the extension groove (20) is perpendicular to the length direction of the through groove (5). The key (3) slides in the through groove (5) and the extension groove (20) through the annular groove. The key (3) is pulled out within the extension groove (20).

4. A washing machine inner drum door according to claim 2, characterized in that: The positioning mechanism includes a positioning pin (8), a positioning spring (9), and a positioning groove (10). The positioning groove (10) is opened on the locking cylinder (4). The positioning spring (9) is sleeved on the pin (2). The positioning pin (8) passes through the positioning groove (10) and is fixedly connected to the pin (2). One end of the positioning spring (9) is limited by the positioning pin (8), and the other end of the positioning spring (9) is limited by the fixing mechanism.

5. A washing machine inner drum door according to claim 4, characterized in that: The positioning groove (10) is an "L" shaped groove.

6. A washing machine inner drum door according to claim 1, characterized in that: The limiting movement mechanism includes a protrusion (11), a pressure block (12), a telescopic member (13), a telescopic connector (14), a limiting member (15), and a top plate (16). The limiting member (15) is fixedly connected to the fixing mechanism. The vertical bottom of the protrusion (11) is fixedly connected to the inner door. A hole for the protrusion (11) is provided on the outer door (1). The protrusion (11) passes through the hole and enters the outer side of the outer door (1). The telescopic connector (14) is located between the limiting member (15) and the fixing mechanism. The telescopic connector (14) moves up and down in the limiting cavity formed by the telescopic connector (13) at the top and the pressure block (12) at the bottom. The pressure block (12) works in conjunction with the protrusion (11). A top plate (16) is provided on the top of the telescopic connector (13). The top plate (16) is fixedly connected to the fixing mechanism. An annular limiting groove (17) is provided on the pin (2). The pressure block (12) enters the annular limiting groove (17) under the action of the telescopic connector (13).

7. A washing machine inner drum door according to claim 6, characterized in that: An arc-shaped groove is provided on the protrusion (11), and a semi-circular groove is provided on the pressure block (12). The openings of the arc-shaped groove and the semi-circular groove are opposite to each other to form the pin hole of the pin (2).

8. A washing machine inner drum door according to claim 6, characterized in that: A pressing hole for pressing the telescopic component (13) is provided on the top plate (16). The telescopic component (13) includes a telescopic spring, an upper connecting post and a lower connecting post. One end of the lower connecting post is fixedly connected to the telescopic connecting component (14), and the other end of the lower connecting post is connected to one end of the telescopic spring. The other end of the telescopic spring is connected to one end of the upper connecting post, and the other end of the upper connecting post is limited in the pressing hole.

9. A washing machine inner drum door according to claim 1, characterized in that: The fixing mechanism includes a first fixing plate, a second fixing plate (6) and a third fixing plate (7). The first fixing plate, the second fixing plate (6) and the third fixing plate (7) are arranged in parallel at intervals on the outer side of the outer door (1). A limiting movement mechanism is installed between the first fixing plate and the second fixing plate (6). A locking mechanism and a positioning mechanism are set between the second fixing plate (6) and the third fixing plate (7). A pin (2) hole is opened on the first fixing plate, the second fixing plate (6) and the third fixing plate (7). The pin (2) passes through the three pin (2) holes to lock one end of the inner door and the outer door (1).

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