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CN-121976717-A - Fool-proof mechanism and cabin door structure

CN121976717ACN 121976717 ACN121976717 ACN 121976717ACN-121976717-A

Abstract

The invention belongs to the technical field of aircraft cabin doors, and discloses a foolproof mechanism, wherein a latch driving shaft in the foolproof mechanism can drive a latch hook to switch between a latch state and an unlatching state, a first support and a second support are arranged on a cabin door at intervals, a transmission system is rotationally connected with the first support and the second support, the latch driving shaft at least has an upper latching position and an unlatching position, the latch hook is in the latch state when in the upper latching position, the transmission system is in a first locking position, the rotation of the latch driving shaft is not limited, the latch hook is in the unlatching state when in the unlatching position, the transmission system can rotate to a second locking position, and the rotation of the latch driving shaft is limited when the transmission system is in the second locking position, so that the latch hook is always in the unlatching state. The fool-proof mechanism ensures that the lock hook can be locked at the opening position after the cabin door is opened, and the lock of the lock hook can be released after the cabin door reaches the closing position, so that the normal closing and locking of the cabin door are not hindered, and the interference problem caused by manual misoperation can be avoided.

Inventors

  • JIN FEI
  • SONG XUAN
  • ZHANG MIN
  • ZHANG DENGHUI
  • ZHANG CHI
  • FENG DONGXIANG

Assignees

  • 中国商用飞机有限责任公司
  • 上海飞机制造有限公司

Dates

Publication Date
20260505
Application Date
20260320

Claims (10)

  1. 1. Fool-proof mechanism for use in a latch hook (100) of a hatch structure, the latch hook (100) having a latched state and an unlatched state to lock and unlock the hatch, comprising: A latch drive shaft (10), a first support (20), a second support (30) and a transmission system (40), wherein the latch drive shaft (10) can drive the latch hook (100) to switch between the latch state and the unlatch state, the first support (20) and the second support (30) are arranged on the cabin door at intervals, and the transmission system (40) is rotatably connected to the first support (20) and the second support (30); The latch drive shaft (10) has at least a latched position and an unlatched position, and in the latched position the latch hook (100) is in the latched state, the transmission system (40) is in a first locked position, and rotation of the latch drive shaft (10) is not limited, in the unlatched position the latch hook (100) is in the unlatched state, the transmission system (40) is rotatable to a second locked position, and in the second locked position the transmission system (40) is in the second locked position, rotation of the latch drive shaft (10) is limited such that the latch hook (100) is always in the unlatched state.
  2. 2. Fool-proof mechanism according to claim 1, characterized in that the latch drive shaft (10) is provided with a locking block (11) protruding upwards, the transmission system (40) is provided with a locking flange (411) protruding upwards, the locking flange (411) protruding under the locking block (11) for locking the locking block (11) when the latch drive shaft (10) is in the unlatched position.
  3. 3. Fool-proof mechanism according to claim 2, characterized in that the transmission system (40) comprises a first rocker arm (41), the first rocker arm (41) is rotatably connected to the connecting shaft of the first support (20), a torsion spring (412) is sleeved outside the connecting shaft, the locking flange (411) is arranged at one end of the first rocker arm (41) close to the latch driving shaft (10), and when the latch driving shaft (10) is in the unlatching position, the locking flange (411) can extend into the lower part of the locking block (11) under the driving of the torsion spring (412).
  4. 4. A fool-proof mechanism according to claim 3, wherein the transmission system (40) is provided with a roller (451), the roller (451) is in rolling connection with a body support (500), the body support (500) is arranged on the body, when the latch hook (100) is in the unlatching state and the cabin door is gradually opened, the roller (451) can roll on the body support (500) until the latch door is separated from the body support (500), so that the locking flange (411) locks the locking block (11) under the driving of the torsion spring (412), and when the latch hook (100) is in the unlatching state and the cabin door is gradually closed, the roller (451) can approach the body support (500) until abutting the body support (500) and roll along the inclined plane of the body support (500) to drive the locking flange (411) to be far away from the locking block (11) to unlock the same.
  5. 5. Fool-proof mechanism according to claim 3, characterized in that the first support (20) is provided with a limit shaft (42), the limit shaft (42) being located on the side of the connecting shaft facing away from the locking flange (411), the first rocker arm (41) being in abutment with the limit shaft (42) when the transmission system (40) is in the second locking position.
  6. 6. A fool-proof mechanism according to claim 3, wherein the first rocker arm (41) is provided in a V-shaped structure, and the inflection point position of the first rocker arm (41) is rotatably connected to the connecting shaft.
  7. 7. Fool-proof mechanism according to claim 3, characterized in that the transmission system (40) further comprises a connecting rod (43), a second rocker arm (44) and a third rocker arm (45), wherein one end of the connecting rod (43) is rotatably connected to one end of the first rocker arm (41) facing away from the locking flange (411), the other end of the connecting rod (43) is rotatably connected to the second rocker arm (44), the second rocker arm (44) is rotatably connected to the third rocker arm (45), one end of the third rocker arm (45) facing away from the second rocker arm (44) is rotatably connected to a body support (500), and both the second rocker arm (44) and the third rocker arm (45) are rotatably connected to the second support (30).
  8. 8. Fool-proof mechanism according to claim 7, characterized in that the length of the connecting rod (43) is adjustable.
  9. 9. Fool-proof mechanism according to claim 7, characterized in that the length of the second rocker arm (44) is smaller than the length of the third rocker arm (45).
  10. 10. Hatch door structure, characterized in that it comprises a fool-proof mechanism according to any of claims 1-9, a hatch door, a lock hook (100), a hinge assembly, a fuselage and a lock block (200), said lock block (200) being fixed to said fuselage, said hatch door being rotatably connected to said fuselage, one end of said hinge assembly being fixed to said hatch door and the other end being rotatably connected to said lock hook (100), said fool-proof mechanism being fixed to said hatch door and being connected to said lock hook (100), said hinge assembly being adapted to cooperate with said latch drive shaft (10) in said fool-proof mechanism to drive said lock hook (100) to hook said lock block (200) to lock said hatch door or to disengage from said lock block (200) to open said hatch door, and said latch drive shaft (10) in said fool-proof mechanism cooperating with said transmission system (40) to ensure that said unlocked state of said lock hook (100) is locked after said lock hook (100) is disengaged from said lock block (200).

Description

Fool-proof mechanism and cabin door structure Technical Field The invention relates to the technical field of aircraft cabin doors, in particular to a fool-proof mechanism and a cabin door structure. Background The civil aircraft cargo hold door is a passage for aircraft cargo to enter and exit, and is in a common form of an outward opening hinge and a latch hook type cargo hold door, wherein the cargo hold door mainly comprises a hinge, a main structure wall plate and a latch hook. As shown in fig. 6, in particular, the structure of the fuselage door frame mainly associated with the door mainly has an upper hinge and a lower latch assembly, and the cargo door is connected to the fuselage door frame by means of the upper hinge and the lower latch hook. When the cabin door is opened, the lock hook on the cabin door rotates to be separated from the latch component on the machine body to unlock, then the cabin door rotates outwards around the center of the hinge to be opened, the lock hook in the opened state does not interfere with the machine body latch component, when the cabin door is closed, the cabin door rotates to the closed position around the center of the hinge, and then the lock hook on the cabin door rotates to lock the latch component on the machine body. Referring to fig. 6 to fig. 9, in the prior art, the lock hook 100 is driven by a lock chain to hook and connect the lock block 200 or disengage from the lock block 200 to drive the skin 300 to move along the movement track 101, so as to realize the closing of the cabin door, and conversely, realize the opening of the cabin door. The door opening and closing is a cycle, namely a movement sequence formed by the outward rotation of the lock hook opening and the door, the inward rotation of the loading and unloading and the door closing to the proper position and the lock hook closing. However, if an artificial misoperation or other reasons occur in the closing process, the movement sequence is that the latch hook closes-the cabin door rotates inwards, the latch assembly of the latch hook and the machine body can interfere in movement, and structural damage is caused. As shown in fig. 10-12, after the latch hook 100 is separated from the latch block 200, the latch hook 100 is often switched from the unlatched state to the latched state by manual operation, so that interference between the latch hook 100 and the latch block 200 occurs when the door is closed, and the closing of the door is affected. Therefore, how to design a mechanism for preventing misoperation at the interface of the cabin door and the machine body door frame, so that the lock hook can be locked at the opening position after the cabin door is opened, and the lock of the lock hook can be released after the cabin door reaches the closing position, so that the normal closing and locking movement of the cabin door are not hindered, and the problem of interference caused by the misoperation is solved by the personnel in the field. Disclosure of Invention The invention aims to provide a fool-proof mechanism and a cabin door structure, which enable a lock hook to be locked at an open position after a cabin door is opened, and release the lock of the lock hook after the cabin door reaches a closed position, so that the normal closing and locking movement of the cabin door are not hindered, and the interference problem caused by misoperation is avoided. To achieve the purpose, the invention adopts the following technical scheme: A fool-proof mechanism for use in a latch hook of a hatch structure, the latch hook having a latched state and an unlatched state for locking and unlocking the hatch, comprising: The latch driving shaft can drive the latch hook to switch between the latch state and the unlatch state, the first support and the second support are arranged on the cabin door at intervals, and the transmission system is rotationally connected with the first support and the second support; the latch drive shaft has at least a latched position and an unlatched position, and in the latched position, the latch hook is in the latched state, the transmission system is in the first locking position, and rotation of the latch drive shaft is not limited, and in the unlatched position, the latch hook is in the unlatched state, the transmission system can rotate to the second locking position, and in the second locking position, rotation of the latch drive shaft is limited, such that the latch hook is always in the unlatched state. Optionally, a locking block is provided on the latch drive shaft, and a locking flange is provided on the transmission system, and the locking flange extends below the locking block to lock the locking block when the latch drive shaft is in the unlatched position. Optionally, the transmission system includes a first rocker arm, the first rocker arm is rotatably connected to a connecting shaft of the first support, a torsion spring is sleeved on the outer side of the co