Airplane cabin door jump adjusting device

Abstract

The utility model belongs to the technical field of aviation, and relates to an aircraft cabin door jump adjusting device. Comprising a lock hook joint (1), a base plate (2), a lock hook (3) and a bolt (4), when the aircraft cabin door is locked, the lock hook (3) hooks a shaft of the lock hook connector (1), the lock hook connector (1) is connected with the base plate (2) through the bolt (4), the contact faces of the base plate (2) and the lock hook connector (1) are of tooth-shaped structures matched with each other, each tooth-shaped structure comprises a middle tooth and an edge tooth, and the middle tooth is perpendicular to the edge tooth. The device is wide in application range, can be suitable for various cabin door structures such as a side-opening cabin door, a lower-opening cabin door and an upper-opening cabin door, can conveniently adjust and control the step difference between the cabin door skin and the fuselage skin, ensures that the appearance step difference meets the pneumatic outer edge tolerance requirement, and effectively ensures the aerodynamic appearance streamline of an airplane.

Description

Technical Field

[0001] The utility model belongs to the field of aviation technology and relates to an aircraft cabin door step adjustment device, which is used to adjust the step difference of the outer surface of the cabin door skin relative to the outer surface of the fuselage skin when the cabin door is installed on the fuselage, so as to ensure that the outer shape step difference meets the aerodynamic outer edge tolerance requirements. Background Art

[0002] Modern aircraft doors have different opening methods, depending on the usage scenario, including side-opening, top-opening, bottom-opening, and sliding. Locking methods include hook-type and latch-axis types when closed. When the aircraft door is closed, the door skin generally forms a seam with the fuselage skin on all sides, and the step difference must be strictly controlled. Due to the accumulation of errors during the aircraft door assembly process and the influence of factors such as uncontrollable deformation after the door is removed from the frame, there will always be slight differences in the state of the door from flight to flight. In addition, due to the high requirements for aircraft exterior streamline, the step difference between the door skin and the fuselage skin is also required to be high, generally ±1mm. Therefore, to ensure that the final skin step difference meets the requirements, an adjustable device is generally used to adjust the step difference with the fuselage skin to meet the requirements according to the actual state of the door before the final connection is made.

[0003] Traditional methods for adjusting hatch doors include either using a locking ring with a stock insert or fabricating a custom part. The locking ring with a stock insert requires multiple grinding cycles to ensure the required step difference is met, which is time-consuming and carries the risk of damaging other parts during the grinding process. Fabricating a custom part also increases wait times, costs, and production cycles. Utility Model Content

[0004] Purpose of the utility model

[0005] The utility model overcomes the shortcomings of the traditional cabin door step adjustment method that the operation is difficult and time-consuming, and provides an aircraft cabin door step adjustment device with simple structure, simple operation, light weight, high reliability and wide application range.

[0006] Technical Solution

[0007] In order to solve the above technical problems, the utility model is realized through the following technical solutions: a step-difference adjustment device for an aircraft cabin door is provided, comprising a locking hook joint (1), a pad (2), a locking hook (3), and a bolt (4); when the aircraft cabin door is locked, the locking hook (3) hooks the axis of the locking hook joint (1); the locking hook joint (1) is connected to the pad (2) through the bolt (4); the contact surface between the pad (2) and the locking hook joint (1) is a tooth-shaped structure that matches each other, and the tooth-shaped structure comprises middle teeth and edge teeth, and the middle teeth and edge teeth are perpendicular to each other.

[0008] Furthermore, the edge teeth include left edge teeth and right edge teeth, which are respectively distributed on both sides of the contact surface between the lock hook joint (1) and the backing plate (2). The edge teeth are used to adjust the hatch step difference.

[0009] Furthermore, the middle teeth are used for guiding and preventing heading displacement.

[0010] Furthermore, the distance between each adjacent tooth groove of the middle teeth and the edge teeth is 1 mm.

[0011] Furthermore, the backing plate (2) and the locking hook joint (1) are both made of titanium alloy material.

[0012] Furthermore, the connection between the locking hook joint (1) and the bolt (4) is formed into a long hole (1-2).

[0013] Furthermore, the number of the elongated holes (1-2) is four, evenly distributed around the locking hook joint (1), and the length of the elongated holes (1-2) is 6.5 mm.

[0014] The beneficial effects of this application are:

[0015] The device of the utility model has a wide range of applications and can be applied to various door structures such as side-opening doors, bottom-opening doors, and top-opening doors. The device of the utility model can conveniently adjust the step difference between the control door skin and the fuselage skin to ensure that the shape step difference meets the aerodynamic outer edge tolerance requirements, thereby effectively ensuring the streamlined aerodynamic shape of the aircraft.

[0016] The utility model has a small size, light weight and convenient position adjustment. It adopts the form of long strip holes and tooth-shaped pads. After the position of the lock hook joint is adjusted, there is no need to re-drill holes. It has strong versatility, interchangeability and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the toothed surface structure at the bottom of the lock hook connector (1) of the utility model;

[0019] Figure 3 This is a schematic diagram of the top view of the lock hook connector (1) of the utility model;

[0020] Figure 4 It is a structural diagram of the toothed pad (2) of the lock hook joint.

[0021] Among them: (1) is the lock hook joint, (2) is the toothed pad, (3) is the lock hook, and (4) is the connecting bolt. DETAILED DESCRIPTION

[0022] The present invention is further described below with reference to the following embodiments. The following are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:

[0024] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: The present invention provides a hatch door step adjustment device and a method of use,

[0025] See attached Figures 1 to 4 As shown in the figure, (1) is a lock hook joint, (2) is a toothed pad, (3) is a lock hook, and (4) is a connecting bolt. The characteristics are:

[0026] The lock hook connector (1) comprises a bottom tooth-shaped groove (1-1) and a long strip-shaped connecting hole (1-2).

[0027] The toothed pad (2) includes a toothed groove (2-1), a lock hook (3) is fixed on the cabin door, and a bolt (4) connects and fixes the lock hook joint (1) with the toothed pad (2) and the fuselage structure.

[0028] Toothed grooves in two directions perpendicular to each other are provided on the contact surfaces of the lock hook joint (1) and the lock hook joint toothed pad (2), and the distance between each adjacent toothed groove is 1 mm. The toothed grooves of the lock hook joint and the toothed grooves on the lock hook toothed pad cooperate with each other. By adjusting the relative position of the toothed grooves of the lock hook joint (1) on the lock hook joint toothed pad (2), the contact position between the lock hook (3) and the lock hook joint (1) is adjusted. The lock hook (3) is fixedly connected to the cabin door. When the position of the lock hook (3) is adjusted, the step difference between the cabin door and the fuselage skin is adjusted.

[0029] Furthermore, the main features of the lock hook joint (1) include a bottom toothed groove (1-1) and four long strip holes (1-2); the toothed pad (2) and the lock hook joint (1) are provided with corresponding toothed grooves; toothed grooves in two directions perpendicular to each other are provided, and after the bolts are tightened, the two groups of toothed grooves "bite" each other, and after the lock hook (3) is hooked on the lock hook joint (1) and tension is applied, it can effectively ensure that the lock hook joint (1) and the toothed pad (2) are firmly connected and will not move relative to each other. By adjusting the different toothed groove contact positions of the lock hook joint and the lock hook joint toothed pad, the position of the lock hook joint in the skin direction is adjusted, and then the contact position of the lock hook joint (1) and the lock hook (3) is adjusted to achieve the purpose of adjusting the step difference between the cabin door and the fuselage skin. The position adjustment operation of the lock hook joint (1) is simple and fast.

[0030] Furthermore, the lock hook joint is set at the end of the door away from the hinge, and the distance between each notch of the toothed groove at the bottom of the lock hook joint is 1mm, that is, the step adjustment amount at the farthest end of the door away from the hinge is 1mm, which meets the ±1mm step difference technical requirements between the door and the fuselage skin, and the door is adjusted 1mm away from the hinge end. The closer to the door hinge end, the smaller the step difference is. There are 4 long holes (1-2) on the lock hook joint, the length of the long hole is 6.5mm, and the diameter of the connecting bolt is 4mm, which is a clearance fit. Even if the toothed pad (2) of the lock hook joint is connected to the fuselage structure with bolts (4), if adjustment is required later, it can be adjusted by simply loosening the bolts and nuts without making new bolt holes. After adjustment, the bolts and nuts can be tightened again, which is convenient and quick to adjust.

[0031] Furthermore, the materials of the locking hook joint (1) and the locking hook joint toothed pad (2) are both made of titanium alloy, which has high material strength. After being processed by a CNC machine tool, the parts have high precision, and the error after the toothed grooves are "bite" is small, which improves reliability and enhances interchangeability.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as the general understanding of those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with that in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such here. The specific embodiments described above further explain the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An aircraft door step adjustment device, characterized in that: The invention comprises a locking hook joint (1), a backing plate (2), a locking hook (3), and a bolt (4). When the aircraft cabin door is locked, the locking hook (3) hooks the shaft of the locking hook joint (1), and the locking hook joint (1) is connected to the backing plate (2) via the bolt (4). The contact surfaces of the backing plate (2) and the locking hook joint (1) are tooth-shaped structures that match each other. The tooth-shaped structure comprises middle teeth and edge teeth, and the middle teeth and edge teeth are perpendicular to each other.

2. The device according to claim 1, wherein The edge teeth include left edge teeth and right edge teeth, which are respectively distributed on both sides of the contact surface between the lock hook joint (1) and the pad (2); the edge teeth are used to adjust the hatch step difference.

3. The device according to claim 2, wherein The middle teeth are used for guiding and preventing course displacement.

4. The device according to claim 3, characterized in that The distance between each adjacent tooth groove of the middle teeth and edge teeth is 1mm.

5. The device according to claim 4, characterized in that The backing plate (2) and the locking hook joint (1) are both made of titanium alloy material.

6. The device according to claim 5, characterized in that The connection between the lock hook joint (1) and the bolt (4) is a profiled elongated hole (1-2).

7. The device according to claim 6, characterized in that Furthermore, the number of the elongated holes (1-2) is four, evenly distributed around the locking hook joint (1), and the length of the elongated holes (1-2) is 6.5 mm.

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