A crane slide rail connecting structure of a flat plate air-tight door

Abstract

The application belongs to the field of aviation structure strength design, and particularly relates to a crane sliding rail connecting structure of a flat air-tight door. Through rigid body motion relations between 9 groups of crane rail supports, air-tight doors and crane rails, the crane rail and the crane rail support not bearing the fuselage air-tight load are designed. The crane rail support is divided into three sections for design, the first section variable profile I-shaped crane rail 10 adopts a design form of one fixed crane rail support + one movable crane rail support, the second section equal profile I-shaped crane rail 11 adopts a design form of one fixed crane rail support + four movable crane rail supports, and the third section equal profile I-shaped crane rail 12 adopts a design form of one fixed crane rail support + one movable crane rail support. Through the connecting design relations among the crane rail, the crane rail support and the flat air-tight door, the application realizes decoupling of the flat air-tight door and the crane rail under the air-tight load, makes the load transmission clearer, and avoids the use risk of the air-tight additional load on the crane rail support.

Description

Technical Field

[0001] This application belongs to the field of aerospace structural strength design, and specifically relates to a crane slide rail connection structure for a flat airtight door. Background Technology

[0002] Crane rails are an important load-bearing structure in the cargo handling system of transport aircraft, primarily bearing the vertical loads from ground cargo loading. Flat airtight doors are structures that separate airtight and non-airtight areas in transport aircraft, mainly bearing the airtight loads during flight. The connection design between crane rails and flat airtight doors is complex. Integrated design of crane rails and airtight doors, or the use of fixed rail supports to connect crane rails and airtight doors, can easily lead to the rails and supports bearing the combined loads of ground cargo loads and airtight loads.

[0003] Currently, domestic aircraft often use a connection method with fixed supports, while foreign aircraft use a combination of fixed and movable supports. However, due to the complexity of their connection system, the increase in structural weight, and technological blockade, it is necessary to design a crane rail and airtight door connection method that can decouple the loading load and airtight load of the cargo aircraft's overhead rail.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a crane slide rail connection structure for a flat airtight door to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A crane slide rail connection structure for a flat airtight door includes:

[0008] The first section of variable profile I-beam suspension rail is equipped with a first fixed suspension rail support and a first single and double lug movable suspension rail support in sequence.

[0009] The second section of the I-beam-shaped hanging rail has a second single and double lug movable hanging rail support, a third single and double lug movable hanging rail support, a second fixed hanging rail support, a fourth single and double lug movable hanging rail support, and a fifth single and double lug movable hanging rail support installed on it in sequence.

[0010] The third section of the equal-section I-beam hanging rail is equipped with a sixth single and double lug movable hanging rail support and a third fixed hanging rail support in sequence.

[0011] The first fixed hanging rail support, the second fixed hanging rail support, and the third fixed hanging rail support are all connected to the flat airtight door and the hanging rail by bolts.

[0012] The first, second, third, fourth, fifth, and sixth movable hanging rail supports with single and double lugs all include a double lug support and a single lug support connected by pins. The double lug support is connected to the flat airtight door by bolts, and the single lug support is connected to the hanging rail by bolts.

[0013] In at least one embodiment of this application, the length ratio of the first variable profile I-beam hanging rail, the second constant profile I-beam hanging rail, and the third constant profile I-beam hanging rail is 1:3:1, and there is a 2mm gap between adjacent hanging rails.

[0014] In at least one embodiment of this application,

[0015] The first fixed suspension rail support adopts a combination structure of an I-shaped cross section and a rectangular base;

[0016] The second fixed rail support and the third fixed rail support adopt a combination structure of cross-shaped section and rectangular base.

[0017] In at least one embodiment of this application, the double-ear and single-ear supports of the first single-double-ear movable rail support, the second single-double-ear movable rail support, the third single-double-ear movable rail support, the fourth single-double-ear movable rail support, the fifth single-double-ear movable rail support, and the sixth single-double-ear movable rail support are provided with support reinforcement.

[0018] In at least one embodiment of this application, the ear holes of the double-ear and single-ear supports of the first single-double-ear movable rail support, the second single-double-ear movable rail support, the third single-double-ear movable rail support, the fourth single-double-ear movable rail support, the fifth single-double-ear movable rail support, and the sixth single-double-ear movable rail support are round holes, elliptical holes, or oblong holes.

[0019] In at least one embodiment of this application,

[0020] The ear holes of the double-eared supports of the first single-double-eared movable hanging rail support, the second single-double-eared movable hanging rail support, the fifth single-double-eared movable hanging rail support, and the sixth single-double-eared movable hanging rail support are oblong holes, while the ear holes of the single-eared supports are round holes.

[0021] The ear holes of the double-eared movable rail support in the third single-double-eared and the fourth single-double-eared movable rail support are elliptical holes, while the ear holes of the single-eared support are round holes.

[0022] In at least one embodiment of this application, the lugs of the double-ear movable rail support of the first single-double-ear movable rail support, the second single-double-ear movable rail support, the third single-double-ear movable rail support, the fourth single-double-ear movable rail support, the fifth single-double-ear movable rail support, and the sixth single-double-ear movable rail support have a gap of at least 1 mm between the lugs of the double-ear support and the lugs of the single-ear support.

[0023] In at least one embodiment of this application,

[0024] The cross-sectional area of ​​the first fixed hanging rail support, the second fixed hanging rail support, and the third fixed hanging rail support gradually increases from the hanging rail towards the flat airtight door.

[0025] The cross-sectional area of ​​the double-ear support of the first single-double-ear movable hanging rail support, the second single-double-ear movable hanging rail support, the third single-double-ear movable hanging rail support, the fourth single-double-ear movable hanging rail support, the fifth single-double-ear movable hanging rail support, and the sixth single-double-ear movable hanging rail support is larger than the cross-sectional area of ​​the single-ear support.

[0026] In at least one embodiment of this application, the bolt holes on each suspension rail support are located near the R zone.

[0027] The invention has at least the following beneficial technical effects:

[0028] The crane rail connection structure of the flat airtight door of this application achieves decoupling of the load borne by the flat airtight door and the crane rail under airtight load through the connection design relationship between the crane rail, the crane rail support and the flat airtight door, making the load transfer clearer and avoiding the use risks of additional airtight load to the crane rail support. Attached Figure Description

[0029] Figure 1 This is an overall schematic diagram of the crane slide rail connection structure of a flat airtight door according to one embodiment of this application;

[0030] Figure 2 This is a schematic diagram of a first fixed suspension rail support according to one embodiment of this application;

[0031] Figure 3 This is a schematic diagram of a first single-double-ear movable suspension rail support according to one embodiment of this application;

[0032] Figure 4 This is a schematic diagram of a second single / double ear-fitting movable suspension rail support according to one embodiment of this application;

[0033] Figure 5 This is a schematic diagram of a third single / double ear movable suspension rail support according to one embodiment of this application;

[0034] Figure 6This is a schematic diagram of a second fixed suspension rail support according to one embodiment of this application;

[0035] Figure 7 This is a schematic diagram of a third fixed suspension rail support according to one embodiment of this application;

[0036] Figure 8 This is a schematic diagram of the assembly of a single and double ear movable suspension rail support according to one embodiment of this application;

[0037] Figure 9 yes Figure 8 BB view;

[0038] Figure 10 This is a schematic cross-sectional design of a first fixed suspension rail support according to one embodiment of this application;

[0039] Figure 11 This is a schematic cross-sectional design of the second fixed suspension rail support according to one embodiment of this application.

[0040] in:

[0041] 1-First fixed suspension rail support; 2-First movable suspension rail support with single and double lugs; 3-Second movable suspension rail support with single and double lugs; 4-Third movable suspension rail support with single and double lugs; 5-Second fixed suspension rail support; 6-Fourth movable suspension rail support with single and double lugs; 7-Fifth movable suspension rail support with single and double lugs; 8-Sixth movable suspension rail support with single and double lugs; 9-Third fixed suspension rail support; 10-First section variable cross-section I-beam suspension rail; 11-Second section constant cross-section I-beam suspension rail; 12-Third section constant cross-section I-beam suspension rail. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0044] The following is in conjunction with the appendix Figures 1 to 11 This application will be described in further detail.

[0045] This application provides a crane rail connection structure for a flat airtight door, including three sections of rails and supports installed on the rails.

[0046] Specifically, such as Figure 1 As shown, the first section of the variable-section I-beam suspension rail 10 is sequentially equipped with a first fixed suspension rail support 1 and a first single-double-ear movable suspension rail support 2; the second section of the equal-section I-beam suspension rail 11 is sequentially equipped with a second single-double-ear movable suspension rail support 3, a third single-double-ear movable suspension rail support 4, a second fixed suspension rail support 5, a fourth single-double-ear movable suspension rail support 6, and a fifth single-double-ear movable suspension rail support 7; the third section of the equal-section I-beam suspension rail 12 is sequentially equipped with a sixth single-double-ear movable suspension rail support 8 and a third fixed suspension rail support 9. Among them, the first fixed hanging rail support 1, the second fixed hanging rail support 5 and the third fixed hanging rail support 9 are all connected to the flat airtight door and the hanging rail by bolts; the first single and double ear movable hanging rail support 2, the second single and double ear movable hanging rail support 3, the third single and double ear movable hanging rail support 4, the fourth single and double ear movable hanging rail support 6, the fifth single and double ear movable hanging rail support 7 and the sixth single and double ear movable hanging rail support 8 all include double ear supports and single ear supports connected by pins. The double ear supports are connected to the flat airtight door by bolts, and the single ear supports are connected to the hanging rail by bolts.

[0047] This application discloses a crane rail connection structure for a flat airtight door. The aircraft cargo crane rail is connected to the flat airtight door via crane rail supports, which are then connected to the reinforcing longitudinal beams of the airtight door through distributed connections. During the design process, the rigid body motion relationship between the nine sets of crane rail supports, the airtight door, and the crane rail was analyzed to design a crane rail and crane rail supports that do not bear the airtight load of the fuselage. The crane rail supports are designed in three sections: the first section, a variable-section I-beam crane rail 10, uses one fixed crane rail support and one movable crane rail support; the second section, a constant-section I-beam crane rail 11, uses one fixed crane rail support and four movable crane rail supports; and the third section, a constant-section I-beam crane rail 12, uses one fixed crane rail support and one movable crane rail support. The designs of the three fixed crane rail supports are different.

[0048] In a preferred embodiment of this application, the length ratio of the first variable-section I-beam hanging rail 10, the second constant-section I-beam hanging rail 11, and the third constant-section I-beam hanging rail 12 is 1:3:1, and there is a 2mm gap between adjacent hanging rails.

[0049] In a preferred embodiment of this application, the first fixed rail support 1 adopts an I-shaped cross section and a rectangular base combination structure; the second fixed rail support 5 and the third fixed rail support 9 adopt a cross-shaped cross section and a rectangular base combination structure.

[0050] In a preferred embodiment of this application, the first single / double-ear movable rail support 2, the second single / double-ear movable rail support 3, the third single / double-ear movable rail support 4, the fourth single / double-ear movable rail support 6, the fifth single / double-ear movable rail support 7, and the sixth single / double-ear movable rail support 8 all have supporting ribs arranged on both sides of their bases for both the double-ear and single-ear supports. The ear holes of the double-ear and single-ear supports can be round, elliptical, or oblong. In this embodiment, preferably, the ear holes of the double-ear supports of the first single / double-ear movable rail support 2, the second single / double-ear movable rail support 3, the fifth single / double-ear movable rail support 7, and the sixth single / double-ear movable rail support 8 are oblong holes, and the ear holes of the single-ear supports are round holes; the ear holes of the double-ear supports of the third single / double-ear movable rail support 4 and the fourth single / double-ear movable rail support 6 are elliptical holes, and the ear holes of the single-ear supports are round holes. Advantageously, in this embodiment, there is at least a 1mm gap between the ear plates of the double-ear supports and the ear plates of the single-ear supports of each single / double-ear movable rail support.

[0051] In a preferred embodiment of this application, the cross-sectional area of ​​the first fixed hanging rail support 1, the second fixed hanging rail support 5, and the third fixed hanging rail support 9 gradually increases from the hanging rail towards the flat airtight door; the cross-sectional area of ​​the double-ear support of the first single-double-ear movable hanging rail support 2, the second single-double-ear movable hanging rail support 3, the third single-double-ear movable hanging rail support 4, the fourth single-double-ear movable hanging rail support 6, the fifth single-double-ear movable hanging rail support 7, and the sixth single-double-ear movable hanging rail support 8 is larger than the cross-sectional area of ​​the single-ear support.

[0052] In the preferred embodiment of this application, the bolt holes connecting the base of each hanging rail support to the longitudinal beam of the airtight door and the hanging rail are as close as possible to the R area while ensuring manufacturability.

[0053] The crane rail connection structure of the flat airtight door disclosed in this application employs multiple sets of tie bolts to connect the crane rail and the flat airtight door through movable and fixed rail supports. First, the crane rails are arranged in a length ratio of 1:3:1. Each section of the crane rail is connected to the airtight door using a combination of fixed rail supports and movable rail supports with single and double lugs. The cross-section of the fixed and movable rail supports gradually increases from the rail to the airtight door. The single lug of the movable support connects to the crane rail, while the double lug connects to the airtight door. The single lug is inserted into the double lug using a pin, ensuring a gap of at least 1mm between the single and double lugs. The connection holes for the single and double lugs use a combination of round, elliptical, and oblong holes to ensure that the spacing between every two rail supports is approximately the same. The rail supports are then connected to the airtight door and the crane rails using tie bolts.

[0054] The crane rail connection structure for the flat airtight door of this application realizes the distribution of aircraft loads across the fuselage structure, satisfies the deformation coordination relationship between each rail support, and decouples the crane load and airtight load borne by the rails and rail supports. This application is applicable to the connection of various types of rails, rail supports and aircraft structures, and can achieve the connection unaffected by the deformation of the connection structure. It has the characteristics of simple form, convenient implementation and clear load transfer.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A crane slide rail connection structure for a flat airtight door, characterized in that, include: The first section of variable profile I-beam hanging rail (10) is provided with a first fixed hanging rail support (1) and a first single and double lug movable hanging rail support (2) installed in sequence on the first section of variable profile I-beam hanging rail (10). The second section of the equal-section I-beam hanging rail (11) is provided with the second single and double ear movable hanging rail support (3), the third single and double ear movable hanging rail support (4), the second fixed hanging rail support (5), the fourth single and double ear movable hanging rail support (6), and the fifth single and double ear movable hanging rail support (7) installed in sequence. The third section of the equal-section I-beam hanging rail (12) is equipped with a sixth single and double lug movable hanging rail support (8) and a third fixed hanging rail support (9) in sequence. The first fixed hanging rail support (1), the second fixed hanging rail support (5) and the third fixed hanging rail support (9) are all connected to the flat airtight door and the hanging rail by bolts; The first single-double ear movable hanging rail support (2), the second single-double ear movable hanging rail support (3), the third single-double ear movable hanging rail support (4), the fourth single-double ear movable hanging rail support (6), the fifth single-double ear movable hanging rail support (7), and the sixth single-double ear movable hanging rail support (8) all include a double ear support and a single ear support connected by pins. The double ear support is connected to the flat airtight door by bolts, and the single ear support is connected to the hanging rail by bolts.

2. The crane slide rail connection structure for the flat airtight door according to claim 1, characterized in that, The length ratio of the first variable profile I-beam hanging rail (10), the second equal profile I-beam hanging rail (11), and the third equal profile I-beam hanging rail (12) is 1:3:1, and there is a 2mm gap between adjacent hanging rails.

3. The crane slide rail connection structure for the flat airtight door according to claim 1, characterized in that, The first fixed suspension rail support (1) adopts a combination structure of I-shaped section and rectangular base; The second fixed rail support (5) and the third fixed rail support (9) adopt a combination structure of cross-shaped section and rectangular base.

4. The crane slide rail connection structure for the flat airtight door according to claim 1, characterized in that, The double-ear and single-ear supports of the first single-double-ear movable rail support (2), the second single-double-ear movable rail support (3), the third single-double-ear movable rail support (4), the fourth single-double-ear movable rail support (6), the fifth single-double-ear movable rail support (7), and the sixth single-double-ear movable rail support (8) are provided with support reinforcement.

5. The crane slide rail connection structure for the flat airtight door according to claim 4, characterized in that, The ear holes of the double-ear and single-ear supports of the first single-double-ear movable rail support (2), the second single-double-ear movable rail support (3), the third single-double-ear movable rail support (4), the fourth single-double-ear movable rail support (6), the fifth single-double-ear movable rail support (7), and the sixth single-double-ear movable rail support (8) are round holes, elliptical holes, or oblong holes.

6. The crane slide rail connection structure for the flat airtight door according to claim 5, characterized in that, The ear holes of the double-ear supports of the first single-double-ear movable rail support (2), the second single-double-ear movable rail support (3), the fifth single-double-ear movable rail support (7) and the sixth single-double-ear movable rail support (8) are oblong holes, and the ear holes of the single-ear supports are round holes. The ear holes of the double-ear support of the third single-double-ear movable rail support (4) and the fourth single-double-ear movable rail support (6) are elliptical holes, while the ear holes of the single-ear support are round holes.

7. The crane slide rail connection structure for the flat airtight door according to claim 1, characterized in that, The lugs of the double-ear movable rail support (2), the second single-ear movable rail support (3), the third single-ear movable rail support (4), the fourth single-ear movable rail support (6), the fifth single-ear movable rail support (7), and the sixth single-ear movable rail support (8) have a gap of at least 1 mm between the lugs of the double-ear support and the lugs of the single-ear support.

8. The crane slide rail connection structure for the flat airtight door according to claim 1, characterized in that, The cross-sectional area of ​​the first fixed hanging rail support (1), the second fixed hanging rail support (5) and the third fixed hanging rail support (9) gradually increases from the hanging rail towards the flat airtight door. The cross-sectional area of ​​the double-ear support of the first single-double-ear movable rail support (2), the second single-double-ear movable rail support (3), the third single-double-ear movable rail support (4), the fourth single-double-ear movable rail support (6), the fifth single-double-ear movable rail support (7), and the sixth single-double-ear movable rail support (8) is larger than the cross-sectional area of ​​the single-ear support.

9. The crane slide rail connection structure for the flat airtight door according to claim 1, characterized in that, The bolt holes on each suspension rail support are located near the R zone.

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