A multifunctional composite guide rail device for an aircraft cargo system

Abstract

The present invention discloses a multi-functional composite guide rail device for an aircraft cargo system, which includes a frame, a lateral limiting block, a first auxiliary guide rail, a limiting device, a second auxiliary guide rail, and a third auxiliary guide rail; the frame is installed on the inner floor of the aircraft cargo hold, and except for the position near the cabin door, the frame is arranged symmetrically about the aircraft central axis on the left and right, providing multiple loading positions for the container; ball bearings are distributed on the part of the inner floor of the cabin except for the frame, for the movement of the container. The present invention can meet the actual needs of the current cargo system to load and unload multiple containers using the same set of guide rails.

Description

Technical Field

[0001] The present invention relates to the field of air cargo systems, and specifically to a multifunctional composite guide rail device for an aircraft cargo system, which is applicable to the restraint of different specifications of containers in the aircraft cargo hold. Background Art

[0002] The guide rail is a main component of the cargo system of a transport aircraft, which is arranged in the cargo hold of the aircraft and can realize the rapid loading and unloading of the containers arranged in the hold on the ground and the reliable restraint during air transportation.

[0003] Currently, the commonly used container types in aircraft cargo systems are type M, type B, type A, and type K, and the sizes of these containers are different. In the prior art, there is only a restraint device for restraining a single type of container, and there is no relevant method or product for loading and unloading multiple containers using the same set of guide rails. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional composite guide rail device for an aircraft cargo system, aiming to meet the actual needs of the current cargo system for loading and unloading multiple containers using the same set of guide rails.

[0005] To achieve the above task, the present invention adopts the following technical solutions:

[0006] A multifunctional composite guide rail device for an aircraft cargo system includes a frame, lateral restraint blocks, a first auxiliary guide rail, a restraint device, a second auxiliary guide rail, and a third auxiliary guide rail; the frame is installed on the floor of the aircraft cargo hold, and except for the position near the cabin door, the frame is arranged symmetrically about the aircraft central axis on the left and right, providing multiple loading positions for the container; the part of the cabin floor other than the frame is distributed with balls for the movement of the container;

[0007] The first auxiliary guide rail, the second auxiliary guide rail, and the third auxiliary guide rail are symmetrically arranged on each pair of frames, and are installed in a movable manner, and are installed on the frame through a rotating shaft and a torsion spring, and can maintain an upright state or rotate to a state flush with the frame; lateral restraint blocks are arranged at the ends of each pair of frames close to the aircraft side wall, and the lateral restraint blocks on each pair of frames are jointly used for loading type B containers; the first auxiliary guide rail, the second auxiliary guide rail, and the third auxiliary guide rail are arranged in sequence on each frame in the direction away from the lateral restraint blocks, wherein a pair of first auxiliary guide rails on each pair of frames are used for loading type M containers, a pair of second auxiliary guide rails on each pair of frames are used for loading type A containers, and a pair of third auxiliary guide rails on each pair of frames are used for loading type K containers;

[0008] When various types of containers are loaded, the first auxiliary guide rail, the second auxiliary guide rail, and the third auxiliary guide rail realize the guiding functions for various types of containers; when the container moves, the auxiliary guide rail in front of the moving direction of the container automatically presses the auxiliary guide rail to be flush with the frame through its own gravity from its side inclined surface, so that the container can pass smoothly; while the auxiliary guide rails on both sides of the container remain upright, and the limiting surfaces on the inner sides thereof are used to provide guiding and limiting during the movement of the container.

[0009] All auxiliary guide rails can realize their manual lifting and lowering functions through the limiting device.

[0010] Further, the lateral limiting block is of a T-shaped structure or a [type structure not specified in the original, should be filled in accurately], and the inner side surface of the lateral limiting block is the limiting surface; the lateral limiting block is used for the Y-direction guiding, X-direction constraint, and Z-direction constraint of the B-type container.

[0011] Further, the first auxiliary guide rail includes a guiding block and a mounting frame; the frame is of a concave structure, a rotating shaft is arranged inside the frame, a torsion spring is arranged on the rotating shaft, the guiding block is assembled on the frame through the mounting frame and the torsion spring, and remains upright under the action of the torsion spring; a notch is opened on one side of the rotating shaft on the frame for accommodating the guiding block when the first auxiliary guide rail is retracted; a limiting surface is arranged on the mounting frame for cooperating with the pin; when the first auxiliary guide rail is pressed and retracted into the notch, the pin is extended so that the pin contacts the limiting surface to limit the position of the first auxiliary guide rail; after the pin is retracted, the first auxiliary guide rail becomes upright under the action of the torsion spring, and at this time, the limiting surface contacts the limiting boss inside the frame and cannot continue to rotate and remains in a vertical state.

[0012] Further, the guiding block includes a main body and guide cones symmetrically located at both ends of the main body. The end of the guide cone is a tip. From the tip to the middle of the main body, both the upper edge and the lower edge of the guide cone are arc-shaped structures, and the arc-shaped structure of its upper edge is the inclined side surface; the width of the guiding block is greater than the width of the frame, so that when the container moves in the Y direction, it can smoothly contact the upper edge of the guide cone, thereby pressing the auxiliary guide rail into the notch and making it in a retracted state.

[0013] Further, the inner side surface of the main body on the guiding block constitutes a limiting surface for the container, and a limiting piece is arranged above the limiting surface for limiting the container in the Z direction.

[0014] Further, the first auxiliary guide rail is used for the Y-direction guiding, X-direction constraint, and Z-direction constraint of the M-type container.

[0015] Furthermore, the limiting device includes a handle, a pin, and a fixed block. The fixed block is installed on the side of the frame, and a through hole penetrating the fixed block and the frame is provided on the fixed block for assembling the pin. The pin is connected to the handle; the handle is in threaded fit with the through hole; by pulling and rotating the handle, the pin can be driven backward to keep the pin retracted inside the fixed block.

[0016] Furthermore, all auxiliary guide rails can achieve their manual lifting and lowering functions through the limiting device. When using the manual method, after pressing the auxiliary guide rail into the notch, rotate the handle to make the pin extend and catch the mounting bracket of the auxiliary guide rail to lock the auxiliary guide rail below the transmission plane; when the pin is in the extended position: the container at the cabin door can move along the Y direction; after the loading and unloading are completed, pull out and rotate the handle to retract the pin into the frame, and the auxiliary guide rail rises to the vertical state.

[0017] Furthermore, the second auxiliary guide rail is used for the Y-direction guiding and X-direction constraint of the A-type container and the Z-direction constraint of the A-type container.

[0018] Furthermore, the third auxiliary guide rail is used for the Y-direction guiding and X-direction constraint of the K-type container and the Z-direction constraint of the K-type container.

[0019] Compared with the prior art, the present invention has the following technical features:

[0020] 1. This device can realize the loading and unloading of different specification combination containers in the same cargo hold, broaden the task capacity range of the cargo hold system, realize parallel operation, and can greatly improve the efficiency.

[0021] 2. This device does not require manual removal of the limiting surfaces except at the cabin door position, reduces labor costs, improves unloading efficiency, and can be used for various transport aircraft. Description of the Drawings

[0022] Figure 1 It is a composition diagram of the multifunctional composite guide rail device;

[0023] Figure 2 It is a loading schematic diagram of the multifunctional composite guide rail device;

[0024] Figure 3 It is a limiting schematic diagram of the limiting device;

[0025] Figure 4 It is a locking schematic diagram of the limiting device;

[0026] Figure 5 It is an unlocking schematic diagram of the limiting device;

[0027] Figure 6 It is a loading method diagram of the B-type container (during loading);

[0028] Figure 7It is a loading method diagram of Type B container (loading in place);

[0029] Figure 8 It is a schematic diagram of the restraining surface of the Type B container (loading in place);

[0030] Figure 9 It is a loading method diagram of Type M container (loading);

[0031] Figure 10 It is a loading method diagram of Type M container (loading in place);

[0032] Figure 11 It is a schematic diagram of the restraining surface of the Type M container (loading in place);

[0033] Figure 12 It is a loading method diagram of Type A container (loading);

[0034] Figure 13 It is a loading method diagram of Type A container (loading in place);

[0035] Figure 14 It is a schematic diagram of the restraining surface of the Type A container (loading in place);

[0036] Figure 15 It is a loading method diagram of Type K container (loading in place);

[0037] Figure 16 It is a schematic diagram of the restraining surface of the Type K container (loading in place);

[0038] Figure 17 It is a schematic diagram of the assembly direction of different types of containers;

[0039] Figure 18 It is a schematic diagram of the layout of this device in the cabin. Specific implementation mode

[0040] Referring to the attached drawings, the present invention provides a multifunctional composite guide rail device for an aircraft cargo system, including a frame 1, a lateral restraining block 2, a first auxiliary guide rail 3, a restraining device 4, a second auxiliary guide rail 5, and a third auxiliary guide rail 6; as Figure 1 shown; the frame 1 is installed on the inner floor of the aircraft cargo hold. Except for the position near the cabin door, the frame 1 is arranged symmetrically about the aircraft central axis on the left and right, providing multiple loading positions for the container, as Figure 2 shown, enabling the loading and unloading of Type B, Type M, Type A, and Type K containers respectively from the cabin door; the frame 1 is not arranged at the position near the cabin door; the part of the floor except for the frame 1 is distributed with balls for the movement of the container; through the coordinated action of the above components, the rapid loading and reliable restraint of the container in the cabin are achieved.

[0041] The first auxiliary guide rail 3, the second auxiliary guide rail 5, and the third auxiliary guide rail 6 are symmetrically arranged on each pair of frames 1. They are installed in a movable manner and are mounted on the frame 1 through a rotating shaft and a torsion spring, and can maintain an upright state or rotate to a state flush with the frame 1. At the end of each pair of frames 1 close to the side wall of the aircraft, there are lateral limit blocks 2. The lateral limit blocks 2 on each pair of frames 1 are jointly used to load type B containers. The first auxiliary guide rail 3, the second auxiliary guide rail 5, and the third auxiliary guide rail 6 are arranged in sequence on each frame 1 in a direction away from the lateral limit block 2. Among them, a pair of first auxiliary guide rails 3 on each pair of frames 1 are used to load type M containers, a pair of second auxiliary guide rails 5 on each pair of frames 1 are used to load type A containers, and a pair of third auxiliary guide rails 6 on each pair of frames 1 are used to load type K containers;

[0042] When loading various types of containers, the protruding parts at both ends of the first auxiliary guide rail 3, the second auxiliary guide rail 5, and the third auxiliary guide rail 6 realize the guiding function for various types of containers. When the container moves, the auxiliary guide rails (the first auxiliary guide rail 3, the second auxiliary guide rail 5, and the third auxiliary guide rail 6) in front of the moving direction of the container automatically press the auxiliary guides against the frame 1 flush with their own gravity from the side inclined plane 11, ensuring that the container can pass smoothly; while the auxiliary guide rails on both sides of the container remain upright, and the limiting surfaces 10 on their inner sides provide guiding and limiting during the movement of the container;

[0043] All auxiliary guide rails can realize their functions of manual raising and lowering (upright state or state flush with the frame 1) through the limiting device 4. That is, in a manual manner, for the auxiliary guide rails that are not needed during the loading process, after pressing the auxiliary guide rail flush with the frame 1, pull out and rotate the handle 7 so that the pin 8 on the limiting device 4 protrudes, making the pin 8 lock the rotating shaft of the auxiliary guide rail and prevent it from rotating, thus realizing the locking of the auxiliary guide rail below the transmission plane, as Figure 3 、 Figure 4 shown. After the loading and unloading are completed, pull out and rotate the handle 7 to retract the pin 8 into the interior of the frame 1, and the auxiliary guide rail rises above the transmission plane under the action of the torsion spring, as Figure 5 shown.

[0044] a) Frame 1

[0045] The frame 1 can be installed on the aircraft floor. Its main functions are: supporting and fixing the lateral limit block 2, the first auxiliary guide rail 3, the second auxiliary guide rail 5, the third auxiliary guide rail 6, etc.; transferring the load to the floor.

[0046] b) Lateral limit block 2

[0047] The lateral restraint block 2 can be installed at the position on the frame 1 closest to the corresponding position of the aircraft side wall. The lateral restraint block 2 is of a T-shaped structure or a 7-shaped structure, and the inner side surface of the lateral restraint block 2 is the restraint surface 9; its main functions are: for the Y-direction guidance and ±X-direction restraint of the type B container; for the +Z-direction restraint of the type B container. In this solution, the X direction is the length direction of the frame 1, the Y direction is the width direction of the frame 1, that is, the central axis direction of the aircraft, and the Z direction is the height direction of the frame 1; the positive and negative of the direction are defined according to actual needs.

[0048] c) The first auxiliary guide rail 3

[0049] The first auxiliary guide rail 3 is installed on the frame 1. When loading and unloading the type B container, the type B container automatically presses the first auxiliary guide rail 3 below the transmission plane along its inclined side surface 11 by its own gravity, ensuring that the type B container can pass smoothly.

[0050] As Figure 3 shown, the first auxiliary guide rail 3 includes a guiding block 31 and a mounting bracket 32; the frame 1 is of a concave structure, a rotating shaft is arranged inside the frame 1, and a torsion spring 33 is arranged on the rotating shaft. The guiding block is assembled on the frame 1 through the mounting bracket 32 and the torsion spring 33 and remains upright under the action of the torsion spring 33; a notch 101 is opened on one side of the frame 1 where the rotating shaft is located for accommodating the guiding block 31 when the first auxiliary guide rail 3 is retracted. A limiting surface 34 is arranged on the mounting bracket 32 for cooperating with the pin 8; when the first auxiliary guide rail 3 is pressed and retracted into the notch 101, the pin 8 is extended so that the pin 8 contacts the limiting surface 34 to limit the position of the first auxiliary guide rail 3; after the pin 8 is retracted, under the action of the torsion spring 33, the first auxiliary guide rail 3 becomes upright, and at this time the limiting surface 34 contacts the limiting boss inside the frame 1 and cannot continue to rotate and remains in a vertical state.

[0051] The said guiding block 31 includes a main body 311 and guide cones 312 symmetrically located at both ends of the main body. The end of the guide cone 312 is a tip. From the tip towards the middle of the main body, both the upper edge and the lower edge of the guide cone 312 are arc-shaped structures, and the arc-shaped structure of its upper edge is the inclined side surface 11; the width of the guiding block 31 is greater than the width of the frame 1, so that when the container moves in the Y direction, it can smoothly contact the upper edge of the guide cone 312, thereby pressing the auxiliary guide rail into the notch 101 and making it in a retracted state. The inner side surface of the main body 311 on the guiding block 31 constitutes a restraint surface 10 for the container, and a restraint piece 13 is arranged above the restraint surface 10 for performing Z-direction restraint on the container; that is, the restraint pieces 13 on the auxiliary guide rails that remain upright on both sides of the container can clamp the edge of the container, while the restraint surface 10 plays a role of guiding and limiting.

[0052] The structures of the second auxiliary guide rail 5 and the third auxiliary guide rail 6 are the same as those of the first auxiliary guide rail 3 and will not be elaborated here.

[0053] The main functions of the first auxiliary guide rail 3 are as follows:

[0054] It is used for Y-direction guiding and ±X-direction constraint of the M-type container; it is used for +Z-direction constraint of the M-type container.

[0055] d) Stop device 4

[0056] The stop device includes a handle 7, a pin 8 and a fixing block 12. Among them, the fixing block 12 is installed on the side of the frame 1. A through hole penetrating the fixing block and the frame 1 is provided on the fixing block 12 for assembling the pin 8, and the pin 8 is connected to the handle 7; the handle 7 and the through hole can be, for example, in a threaded fit; by pulling and rotating the handle 7, the pin 8 is driven backward, and the state where the pin 8 retracts into the interior of the fixing block 12 can be maintained.

[0057] All auxiliary guide rails can realize their manual lifting and lowering functions through the stop device 4. That is, when using the manual method, after pressing the auxiliary guide rail into the notch 101, rotate the handle 7 to make the pin 8 extend, and lock the auxiliary guide rail below the transfer plane by catching the mounting bracket 32 of the auxiliary guide rail; when the pin 8 is in the extended position:

[0058] The container at the hatch door can move along the ±Y direction; after loading and unloading, pull out and rotate the handle 7 to make the pin 8 retract into the frame, and the auxiliary guide rail rises above the transfer plane.

[0059] e) Second auxiliary guide rail 5

[0060] The second auxiliary guide rail 5 is installed on the frame 1. When loading and unloading the B-type and M-type containers, the B-type and M-type containers automatically press the second auxiliary guide rail 5 below the transfer plane along its side inclined plane by their own gravity, ensuring that the B-type and M-type containers can pass smoothly.

[0061] The main functions of the second auxiliary guide rail 5 are as follows:

[0062] It is used for Y-direction guiding and ±X-direction constraint of the A-type container; it is used for +Z-direction constraint of the A-type container.

[0063] f) Third auxiliary guide rail 6

[0064] The third auxiliary guide rail 6 is installed on the frame 1. When loading and unloading the B-type, M-type and A-type containers, the B-type, M-type and A-type containers automatically press the third auxiliary guide rail 6 below the transfer plane along its side inclined plane by their own gravity, ensuring that the B-type, M-type and A-type containers can pass smoothly.

[0065] The main functions of the third auxiliary guide rail 6 are as follows:

[0066] It is used for Y-direction guiding and ±X-direction constraint of the K-type container; it is used for +Z-direction constraint of the K-type container.

[0067] 4.2 Container Loading and Unloading Method

[0068] 4.2.1 Method for Loading Containerized Goods into Type B Containers

[0069] a) Before entering the cabin, the loading personnel manually (without tools) lock the limiting devices at the first auxiliary guide rail 3, the second auxiliary guide rail 5, and the third auxiliary guide rail 6 in the multi-functional composite guide rail device at the cabin door (in the lowered state), that is, after manually adjusting the auxiliary guide rails to the lowered state, pull out the handle 7 and turn it to make the pin 8 extend out of the frame. At this time, the container can move along the ±X direction, as Figure 6 shown;

[0070] b) After the Type B container passes through the cabin area and until it contacts the limiting surface 9 on the side limiting block 2, as Figure 8 shown, push it along the X direction to reach the predetermined loading position. During this process, the auxiliary guide rails outside the cabin area are automatically pressed below the transmission plane by the Type B container along the side inclined surface 11 by its own gravity, as Figure 7 shown.

[0071] c) Complete the loading operation at this loading position.

[0072] 4.2.2 Method for Loading Containerized Goods into Type M Containers

[0073] a) Before entering the cabin, the loading personnel manually (without tools) lock the limiting devices at the second auxiliary guide rail 5 and the third auxiliary guide rail 6 in the multi-functional composite guide rail device at the cabin door (in the lowered state), that is, after manually adjusting the auxiliary guide rails to the lowered state, pull out the handle 7 and turn it to make the pin 8 extend out of the frame. At this time, it can move along the ±X direction, as Figure 9 shown;

[0074] d) After the Type M container passes through the cabin area and until it contacts the limiting surface 10 of the first auxiliary guide rail 3, as Figure 11 shown, push it along the X direction to reach the predetermined loading position. During this process, the auxiliary guide rails outside the cabin area are automatically pressed below the transmission plane by the Type M container along the side inclined surface 11 by its own gravity, as Figure 10 shown.

[0075] e) Complete the loading operation at this loading position.

[0076] 4.2.3 Method for Loading Containerized Goods into Type A Containers

[0077] a) Before entering the cabin, the loading personnel manually (without tools) lock the limiting device at the second auxiliary guide rail 5 in the multi-functional composite guide rail device at the cabin door (in the lowered state), that is, after manually adjusting the auxiliary guide rail to the lowered state, pull out the handle 7 and turn it to make the pin 8 extend out of the frame. At this time, it can move along the ±X direction, as Figure 12 shown;

[0078] b) After the A-type container passes through the hatch area and until it contacts the limiting surface 10 of the second auxiliary guide rail 5, as Figure 14 shown, it is pushed along the X direction to reach the predetermined loading position. During this process, for the auxiliary guide rails outside the hatch area, the A-type container automatically presses them below the transmission plane along the side inclined surface 11 by its own gravity, as Figure 13 shown.

[0079] c) Complete the loading operation at this loading position.

[0080] 4.2.4 Method for Loading Containerized Goods with K-Type Containers

[0081] a) Check the third auxiliary guide rail 6 at the hatch position. If it is in the lowered state, pull out the handle 7 and turn it to retract the pin 8 inside the frame, so that the third auxiliary guide rail 6 is in the raised state.

[0082] b) Install the K-type container until it contacts the limiting surface 10 of the third auxiliary guide rail 6, as Figure 16 shown, and push it along the X direction to reach the predetermined loading position, as Figure 15 shown.

[0083] c) Complete the loading operation at this loading position.

[0084] 4.2.5 Method for Loading Containerized Goods with Combined Loading of Various Containers

[0085] a) Before entering the hatch, the loading personnel manually (without tools) lock the limiting devices at the first auxiliary guide rail 3, the second auxiliary guide rail 5, and the third auxiliary guide rail 6 in the multi-functional composite guide rail device at the hatch, that is, manually adjust the auxiliary guide rails to the lowered state and then pull out the handle 7 and turn it to make the pin 8 extend in its (lowered) state. At this time, all containers can move along the ±X direction;

[0086] b) After the container passes through the hatch area and until it contacts the corresponding limiting surface 9 (limiting surface 10) of the loading position, it is pushed along the X direction to reach the predetermined loading position. During this process, for the auxiliary guide rails outside the hatch area, they are automatically pressed below the transmission plane along the side inclined surface 11 by their own gravity, as Figure 17 shown.

[0087] c) If a K-type container is installed in the hatch area, pull out the handle 7 and turn it to retract the pin 8 inside the frame, so that the third auxiliary guide rail 6 is in the raised state.

[0088] d) Complete the loading operation.

[0089] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A multifunctional composite guide rail device for an aircraft cargo system, characterized in that, It includes a frame (1), lateral limit blocks (2), a first auxiliary guide rail (3), a limit device (4), a second auxiliary guide rail (5), and a third auxiliary guide rail (6); the frame (1) is installed on the inner floor of the aircraft cargo hold. Except for the position near the cabin door, the frame (1) is arranged symmetrically about the aircraft central axis on the left and right, providing multiple loading positions for the container; the part of the cabin floor other than the frame (1) is distributed with balls for the movement of the container. The first auxiliary guide rail (3), the second auxiliary guide rail (5), and the third auxiliary guide rail (6) are symmetrically arranged on each pair of frames (1) and are installed in a movable manner. They are installed on the frame (1) through a rotating shaft and a torsion spring and can maintain an upright state or rotate to a state flush with the frame (1); lateral limit blocks (2) are arranged at the ends of each pair of frames (1) close to the aircraft side wall. The lateral limit blocks (2) on each pair of frames (1) are jointly used to load type B containers; the first auxiliary guide rail (3), the second auxiliary guide rail (5), and the third auxiliary guide rail (6) are arranged in sequence on each frame (1) in the direction away from the lateral limit block (2). Among them, a pair of first auxiliary guide rails (3) on each pair of frames (1) are used to load type M containers, a pair of second auxiliary guide rails (5) on each pair of frames (1) are used to load type A containers, and a pair of third auxiliary guide rails (6) on each pair of frames (1) are used to load type K containers. When loading various types of containers, the first auxiliary guide rail (3), the second auxiliary guide rail (5), and the third auxiliary guide rail (6) realize the guiding functions of various types of containers; when the container moves, the auxiliary guide rail in front of the moving direction of the container automatically presses the auxiliary guide rail to be flush with the frame (1) from its side inclined surface (11) by its own gravity, so that the container can pass smoothly; while the auxiliary guide rails on both sides of the container remain in an upright state, and the limiting surfaces (10) on their inner sides provide guiding and limiting during the movement of the container. All auxiliary guide rails can realize their manual raising and lowering functions through the limit device (4).

2. The multifunctional composite guide rail device for an aircraft cargo system according to claim 1, wherein, The lateral limit block (2) is of a T-shaped structure or a (7)-shaped structure, and the inner side surface of the lateral limit block (2) is a limiting surface (9); the lateral limit block (2) is used for the Y-direction guiding, X-direction constraint, and Z-direction constraint of the type B container.

3. The multifunctional composite guide rail device for an aircraft cargo system according to claim 1, wherein The first auxiliary guide rail (3) includes a guiding block (31) and a mounting bracket (32); the frame (1) is of a concave structure, a rotating shaft is arranged inside the frame (1), and a torsion spring (33) is arranged on the rotating shaft. The guiding block is assembled on the frame (1) through the mounting bracket (32) and the torsion spring (33), and maintains an upright state under the action of the torsion spring (33); a notch (101) is formed on one side of the rotating shaft on the frame (1) for accommodating the guiding block (31) when the first auxiliary guide rail (3) is retracted; a limiting surface (34) is arranged on the mounting bracket (32) for cooperating with the pin (8); when the first auxiliary guide rail (3) is pressed and retracted into the notch (101), the pin (8) is extended so that the pin (8) contacts the limiting surface (34) to limit the position of the first auxiliary guide rail (3); after the pin (8) is retracted, the first auxiliary guide rail (3) becomes upright under the action of the torsion spring (33). At this time, the limiting surface (34) contacts the limiting boss inside the frame (1) and cannot continue to rotate but remains in a vertical state.

4. The multifunctional composite guide rail device for an aircraft cargo system according to claim 3, characterized in that, The described guiding block (31) includes a main body (311) and guiding cones (312) symmetrically located at both ends of the main body. The end of the guiding cone (312) is a tip. From the tip towards the middle of the main body, both the upper edge and the lower edge of the guiding cone (312) are arc-shaped structures, and the arc-shaped structure of its upper edge is the side inclined surface (11); the width of the guiding block (31) is greater than the width of the frame (1), so that when the container moves in the Y direction, it can smoothly contact the upper edge of the guiding cone (312), thereby pressing the auxiliary guide rail into the notch (101) to make it in a retracted state.

5. The multi-functional composite guide rail device for an aircraft cargo system according to claim 4, wherein, The inner side surface of the main body (311) on the guiding block (31) constitutes a limiting surface (10) for the container, and a limiting piece (13) is arranged above the limiting surface (10) for performing Z-direction limiting on the container.

6. The multi-functional composite guide rail device for an aircraft cargo system according to claim 1, characterized in that, The first auxiliary guide rail (3) is used for Y-direction guiding, X-direction constraint, and Z-direction constraint of the M-type container.

7. The multifunctional composite guide rail device for an aircraft cargo system according to claim 1, characterized in that, The described limiting device includes a handle (7), a pin (8), and a fixing block (12). Among them, the fixing block (12) is installed on the side surface of the frame (1), and a through hole penetrating the fixing block and the frame (1) is formed on the fixing block (12) for assembling the pin (8). The pin (8) is connected to the handle (7); the handle (7) is in a threaded fit with the through hole; by pulling and rotating the handle (7), the pin (8) can be driven backward to keep the pin (8) retracted inside the fixing block (12).

8. The multifunctional composite guide rail device for an aircraft cargo system according to claim 1, characterized in that All auxiliary guide rails can realize their manual lifting and lowering functions through the limiting device (4). When using the manual method, after pressing the auxiliary guide rail into the notch (101), rotate the handle (7) to make the pin (8) extend, and clamp the mounting bracket (32) of the auxiliary guide rail to lock the auxiliary guide rail below the transmission plane; when the pin (8) is in the extended position: the container at the cabin door can move in the Y direction; after loading and unloading, pull out and rotate the handle (7) to retract the pin (8) into the frame, and the auxiliary guide rail rises to an upright state.

9. The multifunctional composite guide rail device for an aircraft cargo system according to claim 1, characterized in that The second auxiliary guide rail (5) is used for Y-direction guiding, X-direction constraint, and Z-direction constraint of the A-type container.

10. The multifunctional composite guide rail device for an aircraft cargo system according to claim 1, characterized in that, The third auxiliary guide rail (6) is used for guiding the K-type container in the Y direction and restricting it in the X direction, and for restricting the K-type container in the Z direction.

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