Airplane bottom cabin door structure

Abstract

The invention belongs to the technical field of airplane bottom cabin door structure design, and particularly relates to an airplane bottom cabin door structure which is characterized in that a door latch, a door latch retaining spring, a transmission connecting rod, a transmission rocker arm, a driving connecting rod, a driving rocker arm, a driving shaft and other mechanisms are arranged on a cabin door frame and a cabin door, and the cabin door can be reliably locked at a closed position; and the locking of the cabin door at the closing position is conveniently released, so that the cabin door is automatically opened outwards under the action of gravity.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft bottom hatch structure design, and specifically relates to an aircraft bottom hatch structure. Background Art

[0002] At present, the bottom hatch of an aircraft is usually fixed by a large number of self-locking bolts or quick-release locks. When it needs to be opened, each self-locking bolt or quick-release lock needs to be removed in turn, which is complicated, time-consuming and laborious. The following opening methods are usually used:

[0003] 1) Flip inward or slide inward and upward to open. When the door is opened, it is inside the cabin, so a large space inside the cabin needs to be reserved, and the maintainability is poor;

[0004] 2) The door is flipped outward and downward to open. After opening, the door is close to the ground and is easy to touch the ground, causing structural damage. In order to avoid shaking or accidental closing due to ground wind, a special locking mechanism is required, which has a complex structure and is heavy.

[0005] 3) The door is flipped outward and upward to open. When opened, the position of the door is protruding, which affects the access of personnel, has poor security, and requires a special locking mechanism, which has a complex structure and a large weight.

[0006] This application is proposed in view of the above-mentioned technical defects. Summary of the invention

[0007] The purpose of the present application is to provide an aircraft bottom door structure to overcome or alleviate at least one of the known technical deficiencies.

[0008] The technical solution of this application is:

[0009] An aircraft bottom hatch structure, comprising:

[0010] A door frame (1) having two pairs of door latch holes on both side edges;

[0011] A hatch (2) is arranged in the hatch frame (1); a drive shaft hole is provided on the side wall of the hatch (2), and two pairs of latch grooves are provided on the inner side; one end of the two pairs of latch grooves has a latch drive hole, and the other end has a latch support hole;

[0012] Two pairs of bolts (5) are arranged in the two pairs of bolt installation grooves, the head portions extend from the bolt support holes, the tail portions extend from the bolt drive holes, and the side walls have an annular protrusion;

[0013] Two pairs of bolt retaining springs (6) are sleeved on the outer circumferences of the two pairs of bolts (5), with both ends abutting against the annular protrusions and the ends of the bolt mounting grooves. Relying on elastic force, the heads of the two pairs of bolts (5) are kept inserted into the two pairs of bolt lock holes, thereby locking the cabin door (2) in a closed position;

[0014] Two pairs of transmission connecting rods (7), one end of which is hinged to the tail of the two pairs of door bolts (5);

[0015] Two transmission rockers (8), the middle parts of which are hinged to the inner side of the door (2), one end of each transmission rocker (8) is hinged to the other end of a transmission link (7) in a pair of transmission links (7), and the other end is hinged to the other end of a transmission link (7) in another pair of transmission links (7);

[0016] Two driving connecting rods (9), both ends of which are hinged to one end of two transmission rocking arms (8);

[0017] A driving rocker arm (10), both ends of which are hinged to the middle of the two driving connecting rods (9);

[0018] One end of the drive shaft (11) passes through the drive shaft hole from the outside of the cabin door (2) and is connected to the middle part of the drive rocker arm (10). Rotating the drive shaft (11) can drive the drive rocker arm (10) to rotate, and then drive the two pairs of door bolts (5) to overcome the elastic force of the door bolt retaining springs (6) through two driving connecting rods (9), the transmission rocker arm (8) and two pairs of transmission connecting rods (7), so as to pull the heads of the two pairs of door bolts (5) out of the door bolt lock holes, thereby releasing the lock of the cabin door (2) in the closed position, and the cabin door (2) opens outwards under the action of gravity.

[0019] Optionally, the above-mentioned aircraft bottom door structure further includes:

[0020] Two balancing rods (3), one end of which is hinged on the edges of both sides of the door (2), and the other end of which is hinged on the edges of both sides of the door frame (1);

[0021] Two suspension rocker arms (4), one end of which is hinged to the inner side of the door (2), and the other end of which is bent downward and hinged to the edge of one end of the door frame (1);

[0022] When the cabin door (2) is opened outward, it is constrained by the two balancing rods (3) and the suspension rocker arms (4) and moves in a translational manner in the direction of one end of the cabin door frame (1) where the two suspension rocker arms (4) are hinged.

[0023] Optionally, in the above-mentioned aircraft bottom door structure, the door (2) has a handle groove on its outer side; the handle groove is connected to the drive shaft hole;

[0024] The aircraft bottom door structure further comprises:

[0025] The handle (12) is stuck in the handle slot and is flush with the outer side of the door (2). One end of the handle (12) is hinged to the end of the drive shaft (11) facing away from the drive rocker arm (10) and can be lifted out of the handle slot.

[0026] Optionally, in the above-mentioned aircraft bottom door structure, a lock is provided in the handle slot;

[0027] The handle (12) is provided with a locking groove;

[0028] The aircraft bottom door structure further comprises:

[0029] The lock body (13) comprises a lock seat and a lock hook, wherein the lock seat is arranged in the lock groove; and the lock hook is hinged on the handle (12);

[0030] The lock body retaining spring (14) is connected between the handle (12) and the lock hook, and relies on elastic force to make the head of the lock hook hook on the lock mouth, thereby locking the handle (12) in the handle groove;

[0031] The lock seat is pressed from the outside to make the lock body (13) rotate to overcome the elastic force of the lock body retaining spring (14), thereby making the head of the lock hook escape from the lock opening, releasing the lock of the handle (12) in the handle groove, and then the handle (12) can be lifted out of the handle groove;

[0032] The handle (12) is pressed in the direction of the handle groove, and the outer side of the head of the lock hook contacts the outer side of the lock mouth, thereby squeezing the lock hook, so that the lock body (13) overcomes the elastic force of the lock body retaining spring (14) and rotates. The head of the lock hook slides along the outer side of the lock mouth, bypasses the lock mouth, and is hooked into the lock mouth under the elastic force of the lock body retaining spring (14), thereby locking the handle (12) in the handle groove.

[0033] Optionally, in the above-mentioned aircraft bottom door structure, the lock seat is flush with the outer side of the handle (12).

[0034] Optionally, in the above-mentioned aircraft bottom door structure, the lock hook is hinged to the handle (12) via a pin.

[0035] Optionally, in the above-mentioned aircraft bottom door structure, the lock body retaining spring (14) is a torsion spring, which is sleeved on a pin hinged to the handle (12) and the lock hook.

[0036] Optionally, in the above-mentioned aircraft bottom door structure, the lock body keeps the two ends of the spring (14) against the handle (12) and the lock hook.

[0037] Optionally, in the above-mentioned aircraft bottom door structure, the lock body retaining spring (14) is composed of two torsion springs, and the two torsion springs are distributed on both sides of the lock hook.

[0038] Optionally, in the above-mentioned aircraft bottom door structure, one end of two torsion springs in the lock body retaining spring (14) rests against the lock hook and is connected to each other, and the other end is hooked in a positioning hole provided on the handle (12).

[0039] Optionally, the above-mentioned aircraft bottom door structure further includes:

[0040] The handle holding spring (15) is connected between the handle (12) and the protruding part, and can lift the handle (12) out of the handle groove by elastic force when the lock of the handle (12) in the handle groove is released.

[0041] Optionally, in the above-mentioned aircraft bottom door structure,

[0042] The handle (12) is hinged on the driving shaft (11) through a pin.

[0043] Optionally, in the above-mentioned aircraft bottom door structure, the handle retaining spring (15) is a torsion spring, which is sleeved on the pin of the hinged drive shaft (11) and the handle (12).

[0044] Optionally, in the above-mentioned aircraft bottom door structure, both ends of the handle retaining spring (15) are pressed against the drive shaft (11) and the handle (12).

[0045] Optionally, in the above-mentioned aircraft bottom door structure, the handle holding spring (15) is composed of two torsion springs, and the two torsion springs are distributed on both sides of the drive shaft (11).

[0046] Optionally, in the above-mentioned aircraft bottom door structure, two torsion springs in the handle retaining spring (15) are connected to each other at one end resting against the protruding portion, and the other end is hooked in a positioning hole provided on the handle (12).

[0047] This application has at least the following beneficial technical effects:

[0048] Provided is an aircraft bottom door structure, wherein a door latch, a door latch retaining spring, a transmission connecting rod, a transmission rocker arm, a driving connecting rod, a driving rocker arm, a driving shaft and other mechanisms are arranged on a door frame and a door, so that the door can be reliably locked in a closed position, and the door can be conveniently unlocked in the closed position by rotating a driving shaft, so that the door can be automatically opened outwards under the action of gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of an angle of a door of a bottom door structure of an aircraft provided by an embodiment of the present application when the door is opened outward;

[0050] Figure 2 is a schematic diagram of another angle when the door of the aircraft bottom door structure provided by an embodiment of the present application is opened outward;

[0051] Figure 3 is a schematic diagram of a bottom door structure of an aircraft provided by an embodiment of the present application that locks the door in a closed position;

[0052] Figure 4 is a schematic diagram of the appearance of the aircraft bottom door structure when the door is closed provided by an embodiment of the present application;

[0053] Figure 5 It is a schematic diagram of the aircraft bottom door structure provided by an embodiment of the present application unlocking the door from being locked in a closed position;

[0054] Figure 6 It is a schematic diagram of pressing the lock seat from the outside provided by an embodiment of the present application, so that the lock body overcomes the elastic force of the lock body retaining spring and rotates, so that the head of the lock hook escapes from the lock port, thereby releasing the lock of the handle in the handle groove;

[0055] Figure 7 It is a schematic diagram of a handle automatically being lifted out of the handle slot by the elastic force of a handle holding spring provided in an embodiment of the present application when the handle is unlocked in the handle slot;

[0056] Figure 8 It is a schematic diagram of the assembly of the structure of the bottom door structure of the aircraft provided in an embodiment of the present application;

[0057] Fig. 9 It is a schematic diagram of the assembly of another part of the structure of the aircraft bottom door provided by an embodiment of the present application;

[0058] Fig.10 is a schematic diagram of the structure of a hatch provided in an embodiment of the present application;

[0059] in:

[0060] 1-door frame; 2-door; 3-balance bar; 4-suspension rocker arm; 5-latch; 6-latch holding spring; 7-transmission connecting rod; 8-transmission rocker arm; 9-driving connecting rod; 10-driving rocker arm; 11-driving shaft; 12-handle; 13-lock body; 14-lock body holding spring; 15-handle holding spring.

[0061] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0062] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0063] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0064] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0065] An aircraft bottom hatch structure, comprising:

[0066] The hatch door frame 1 has two pairs of door latch holes on the edges of both sides;

[0067] The hatch 2 is arranged in the hatch frame 1 and is opened outwards without occupying the space in the cabin; the side wall of the hatch 2 is provided with a drive shaft hole, and the inner side is provided with two pairs of latch grooves; one end of the two pairs of latch grooves is provided with a latch drive hole, and the other end is provided with a latch support hole, wherein the two pairs of latch drive holes face the middle of the hatch 2, and the two pairs of latch support holes are distributed on the edges of both sides of the hatch 2;

[0068] Two balancing rods 3, one end of which is hinged to the edges of the door 2 on both sides, and the other end of which is hinged to the edges of the door frame 1 on both sides;

[0069] Two suspension rockers 4 are hinged at one end to the inner side of the door 2, and the other end is bent downward and hinged to the edge of one end of the door frame 1. When the door 2 is opened outward, it is constrained by the two balance bars 3 and the suspension rockers 4 and moves in a translational direction toward the direction of one end of the two suspension rockers 4 hinged to the door frame 1, and remains nearly parallel to the door frame 1. Figure 1-Figure 2 As shown, it is far from the ground, not easy to touch the ground, and is less affected by the ground wind. It does not need to set a special locking mechanism. It has a simple structure, light weight, easy maintenance, and good security.

[0070] Two pairs of bolts 5 are arranged in two pairs of bolt mounting grooves, the head parts extend from the bolt support holes, the tail parts extend from the bolt drive holes, and the side walls have annular protrusions;

[0071] Two pairs of bolt retaining springs 6 are sleeved on the outer periphery of the two pairs of bolts 5, with both ends abutting against the annular protrusion and the end of the bolt mounting groove. Relying on the elastic force, the heads of the two pairs of bolts 5 are kept inserted into the two pairs of bolt lock holes. Figure 3 As shown, lock the hatch 2 in the closed position, as shown in FIG. Figure 4 As shown;

[0072] Two pairs of transmission connecting rods 7, one end of which is hinged to the tail of the two pairs of door latches 5;

[0073] Two transmission rockers 8, the middle part of which is hinged to the inner side of the door 2, one end of each transmission rocker 8 is hinged to the other end of a transmission link 7 in a pair of transmission links 7, and the other end is hinged to the other end of a transmission link 7 in another pair of transmission links 7;

[0074] Two driving connecting rods 9, both ends of which are hinged to one end of two transmission rocking arms 8;

[0075] A driving rocker arm 10, both ends of which are hinged to the middle of the two driving connecting rods 9;

[0076] One end of the driving shaft 11 passes through the driving shaft hole from the outside of the cabin door 2 and is connected to the middle of the driving rocker arm 10. Thus, rotating the driving shaft 11 can drive the driving rocker arm 10 to rotate, thereby driving the two driving connecting rods 9 to swing, driving the two transmission rockers 8 to rotate, causing the two pairs of transmission connecting rods 7 to swing, driving the two pairs of door bolts 5 to overcome the elastic force of the door bolt holding springs 6 to move, and pulling the heads of the two pairs of door bolts 5 out of the door bolt lock holes, as shown in FIG. Figure 5 As shown, the lock of the cabin door 2 in the closed position is released, and the cabin door 2 opens outwards under the action of gravity, and the operation is convenient. After the cabin door 2 is opened outwards, the driving shaft 11 can be loosened, and the two pairs of latches 5 are automatically reset under the elastic force of the latch retaining springs 6. When the cabin door 2 needs to be closed, the driving shaft 11 can be rotated again to drive the two pairs of latches 5 to overcome the elastic force of the latch retaining springs 6 and move, and then the cabin door 2 is pushed to close, and the driving shaft 11 is loosened, so that the two pairs of latches 5 are automatically reset under the elastic force of the latch retaining springs 6, and inserted into the two pairs of latch lock holes, and the cabin door 2 is locked in the closed position.

[0077] In some optional implementations, in the aircraft bottom door structure disclosed in the above embodiment, a handle groove is provided on the outer side of the door 2; the handle groove is connected to the drive shaft hole;

[0078] The aircraft bottom door structure further comprises:

[0079] The handle 12 is stuck in the handle groove and is flush with the outer side of the hatch 2. One end is hinged to the end of the drive shaft 11 facing away from the drive rocker arm 10. When the drive shaft 11 needs to be rotated, the handle 12 can be lifted out of the handle groove and the drive shaft 11 can be driven to rotate by the handle 12.

[0080] In some optional implementations, in the aircraft bottom door structure disclosed in the above embodiment, a lock is provided in the handle slot;

[0081] The handle 12 has a locking groove;

[0082] The aircraft bottom door structure further comprises:

[0083] The lock body 13 has a lock seat and a lock hook, wherein the lock seat is arranged in the lock groove and is flush with the outer side of the handle 12; the lock hook is hinged on the handle 12;

[0084] The lock body retaining spring 14 is connected between the handle 12 and the lock hook, and relies on the elastic force to make the head of the lock hook hook on the lock mouth, locking the handle 12 in the handle groove;

[0085] When the handle 12 needs to be lifted out of the handle slot, the lock seat can be pressed from the outside to make the lock body 13 rotate against the elastic force of the lock body retaining spring 14, thereby making the head of the lock hook escape from the lock port, thereby releasing the lock of the handle 12 in the handle slot. Figure 6 As shown, the handle 12 can be lifted out of the handle slot. After the handle 12 is lifted out of the handle slot, the lock seat can be released, and the lock body 13 is automatically reset under the elastic force of the lock body holding spring 14;

[0086] When the handle 12 needs to be stuck into the handle groove, the handle 12 can be pressed toward the handle groove so that the outer side of the head of the lock hook contacts the outer side of the lock mouth, thereby squeezing the lock hook so that the lock body 13 overcomes the elastic force of the lock body retaining spring 14 and rotates. The head of the lock hook slides along the outer side of the lock mouth, bypasses the lock mouth, and automatically resets under the elastic force of the lock body retaining spring 14, hooks into the lock mouth, and locks the handle 12 in the handle groove.

[0087] In some optional implementations, in the aircraft bottom door structure disclosed in the above embodiments, the lock hook is hinged on the handle 12 through a pin shaft, and the lock body retaining spring 14 is a torsion spring, which is sleeved on the pin shaft, and its two ends rest on the handle 12 and the lock hook. The lock body retaining spring 14 can be designed to be composed of two torsion springs, which are distributed on both sides of the lock hook, and the two torsion springs are connected to each other at one end that rests on the lock hook, and the other end is hooked in the positioning hole opened on the handle 12.

[0088] In some optional implementations, in the aircraft bottom door structure disclosed in the above embodiment, the outer wall of the drive shaft 11 has a protruding portion;

[0089] The aircraft bottom door structure further comprises:

[0090] The handle holding spring 15 is connected between the handle 12 and the protruding part, and can press the lock seat from the outside to make the lock body 13 rotate against the elastic force of the lock body holding spring 14, so that the head of the lock hook escapes from the lock port. When the handle 12 is unlocked in the handle groove, the handle 12 is automatically lifted out of the handle groove by the elastic force. Figure 7 As shown, when the handle 12 needs to be inserted into the handle slot, the elastic force of the handle holding spring 15 is overcome and the handle 12 is pressed toward the handle slot.

[0091] In some optional implementations, in the aircraft bottom door structure disclosed in the above embodiment, the handle 12 is hinged on the drive shaft 11 through a pin shaft, and the handle retaining spring 15 is a torsion spring, which is sleeved on the pin shaft, and its two ends abut against the drive shaft 11 and the handle 12. The handle retaining spring 15 can be designed to be composed of two torsion springs, which are distributed on both sides of the drive shaft 11, and the two torsion springs are connected to each other at one end abutting against the protruding part, and the other end is hooked in the positioning hole opened on the handle 12.

[0092] In the aircraft bottom door structure disclosed in the above embodiment, the assembly relationship between the door structure and its partial structures is as follows: Figure 8-Figure 10 shown.

[0093] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. In the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0094] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. An aircraft bottom door structure, characterized in that: include: A door frame (1) having two pairs of door latch holes on both side edges; A hatch (2) is arranged in the hatch frame (1); a drive shaft hole is provided on the side wall of the hatch (2), and two pairs of latch grooves are provided on the inner side; one end of the two pairs of latch grooves has a latch drive hole, and the other end has a latch support hole; Two pairs of bolts (5) are arranged in the two pairs of bolt installation grooves, the head portions extend from the bolt support holes, the tail portions extend from the bolt drive holes, and the side walls have an annular protrusion; Two pairs of bolt retaining springs (6) are sleeved on the outer circumferences of the two pairs of bolts (5), with both ends abutting against the annular protrusions and the ends of the bolt mounting grooves. Relying on elastic force, the heads of the two pairs of bolts (5) are kept inserted into the two pairs of bolt lock holes, thereby locking the cabin door (2) in a closed position; Two pairs of transmission connecting rods (7), one end of which is hinged to the tail of the two pairs of door bolts (5); Two transmission rockers (8), the middle parts of which are hinged to the inner side of the door (2), one end of each transmission rocker (8) is hinged to the other end of a transmission link (7) in a pair of transmission links (7), and the other end is hinged to the other end of a transmission link (7) in another pair of transmission links (7); Two driving connecting rods (9), both ends of which are hinged to one end of two transmission rocking arms (8); A driving rocker arm (10), both ends of which are hinged to the middle of the two driving connecting rods (9); One end of the drive shaft (11) passes through the drive shaft hole from the outside of the cabin door (2) and is connected to the middle part of the drive rocker arm (10). Rotating the drive shaft (11) can drive the drive rocker arm (10) to rotate, and then drive the two pairs of door bolts (5) to overcome the elastic force of the door bolt retaining springs (6) through two driving connecting rods (9), the transmission rocker arm (8) and two pairs of transmission connecting rods (7), so as to pull the heads of the two pairs of door bolts (5) out of the door bolt lock holes, thereby releasing the lock of the cabin door (2) in the closed position, and the cabin door (2) opens outwards under the action of gravity.

2. The aircraft bottom door structure according to claim 1, characterized in that: Also includes: Two balancing rods (3), one end of which is hinged on the edges of both sides of the door (2), and the other end of which is hinged on the edges of both sides of the door frame (1); Two suspension rocker arms (4), one end of which is hinged to the inner side of the door (2), and the other end of which is bent downward and hinged to the edge of one end of the door frame (1); When the cabin door (2) is opened outward, it is constrained by the two balancing rods (3) and the suspension rocker arms (4) and moves in a translational manner in the direction of one end of the cabin door frame (1) where the two suspension rocker arms (4) are hinged.

3. The aircraft bottom door structure according to claim 1, characterized in that: The hatch (2) has a handle groove on its outer side; the handle groove is connected to the drive shaft hole; The aircraft bottom door structure further comprises: The handle (12) is stuck in the handle slot and is flush with the outer side of the door (2). One end of the handle (12) is hinged to the end of the drive shaft (11) facing away from the drive rocker arm (10) and can be lifted out of the handle slot.

4. The aircraft bottom door structure according to claim 1, characterized in that: A lock is provided in the handle groove; The handle (12) is provided with a locking groove; The aircraft bottom door structure further comprises: The lock body (13) comprises a lock seat and a lock hook, wherein the lock seat is arranged in the lock groove; and the lock hook is hinged on the handle (12); The lock body retaining spring (14) is connected between the handle (12) and the lock hook, and relies on elastic force to make the head of the lock hook hook on the lock mouth, thereby locking the handle (12) in the handle groove; The lock seat is pressed from the outside to make the lock body (13) rotate to overcome the elastic force of the lock body retaining spring (14), thereby making the head of the lock hook escape from the lock opening, releasing the lock of the handle (12) in the handle groove, and then the handle (12) can be lifted out of the handle groove; The handle (12) is pressed in the direction of the handle groove, and the outer side of the head of the lock hook contacts the outer side of the lock mouth, thereby squeezing the lock hook, so that the lock body (13) overcomes the elastic force of the lock body retaining spring (14) and rotates. The head of the lock hook slides along the outer side of the lock mouth, bypasses the lock mouth, and is hooked into the lock mouth under the elastic force of the lock body retaining spring (14), thereby locking the handle (12) in the handle groove.

5. The aircraft bottom door structure according to claim 4, characterized in that: The lock seat is flush with the outer side of the handle (12).

6. The aircraft bottom door structure according to claim 5, characterized in that: The lock hook is hinged on the handle (12) through a pin.

7. The aircraft bottom door structure according to claim 6, characterized in that: The lock body holding spring (14) is a torsion spring, which is sleeved on a pin hinged to the handle (12) and the lock hook.

8. The aircraft bottom door structure according to claim 6, characterized in that: The two ends of the lock body holding spring (14) are pressed against the handle (12) and the lock hook.

9. The aircraft bottom door structure according to claim 8, characterized in that: The lock body holding spring (14) is composed of two torsion springs, which are distributed on both sides of the lock hook.

10. The aircraft bottom door structure according to claim 9, characterized in that: One end of two torsion springs in the lock body holding spring (14) abutting against the lock hook is connected to each other, and the other end is hooked in a positioning hole provided on the handle (12).

11. The aircraft bottom door structure according to claim 10, characterized in that: Also includes: The handle holding spring (15) is connected between the handle (12) and the protruding part, and can lift the handle (12) out of the handle groove by elastic force when the lock of the handle (12) in the handle groove is released.

12. The aircraft bottom door structure according to claim 11, characterized in that: The handle (12) is hinged on the driving shaft (11) through a pin.

13. The aircraft bottom door structure according to claim 12, characterized in that: The handle holding spring (15) is a torsion spring, which is sleeved on the pin of the hinged drive shaft (11) and the handle (12).

14. The aircraft bottom door structure according to claim 13, characterized in that: The two ends of the handle holding spring (15) are pressed against the driving shaft (11) and the handle (12).

15. The aircraft bottom door structure according to claim 14, characterized in that: The handle holding spring (15) is composed of two torsion springs, and the two torsion springs are distributed on both sides of the driving shaft (11).

16. The aircraft bottom door structure according to claim 15, characterized in that: Two torsion springs in the handle holding spring (15) are connected to each other at one end which abuts against the protruding part, and the other end is hooked in a positioning hole provided on the handle (12).

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