A universal transmission and bidirectional limiting device for civil aircraft freight container units

Abstract

A universal transfer and bidirectional movement limiting device for cargo container units in civil aircraft is disclosed, relating to the field of cargo aircraft tools. The left and right pawls are locked and fixed by a locking mechanism, forming a stable X-shaped structure. When a container unit on one side contacts positioning block I, the left pawl is subjected to force, and due to the support of the right pawl, it will not rotate backward. When a container unit on the other side contacts positioning block II, the right pawl is subjected to force, and due to the support of the left pawl, it will not rotate forward, thus achieving bidirectional movement limiting of the container unit. This device is suitable for situations where two adjacent bidirectional movement limiting devices are close together in a layout integrating container units of different configurations, making it impossible to install ball bearing devices individually. It improves the compatibility and adaptability of the cargo system, ensuring smooth loading and unloading of container units and reliable movement limiting.

Description

Technical Field

[0001] This utility model relates to the field of cargo aircraft tools, specifically to a universal transmission and bidirectional movement limiting device for civil aircraft cargo container units. Background Technology

[0002] With the booming development of air freight and the widespread application of various container configurations by airlines, freight systems that can adapt to the loading needs of multiple container configurations are increasingly favored by airlines. As a key functional component of civil aircraft containerized freight systems, bidirectional movement restraints are typically embedded in pre-set interfaces of standard floor rails. Their core function is to apply reliable mechanical constraints to the container units during transport, limiting their displacement in the heading, reverse heading, and vertical direction. The installation and positioning of bidirectional movement restraints in freight systems must be determined based on the differences in container configuration and specific dimensional parameters.

[0003] Currently, commonly used container units mainly include four configurations: Type A, Type K, Type M, and Type B. To achieve compatible loading of different configuration container units by cargo aircraft, a combined layout scheme of two or more configurations is required (e.g., a combination of 11A+K and 10M+K). However, such a combined layout will cause specific technical problems: the spacing between two adjacent bidirectional movement limiting devices is too small, making it impossible to install the ball bearing transfer assembly independently. This problem mainly occurs in the universal transfer area of ​​the main cargo hold door and the universal transfer area of ​​the second-to-last loading position.

[0004] The core function of the universal transfer area at the main cargo hold door is to transfer cargo containers in both spanwise and heading directions. As for the universal transfer area at the penultimate loading position, due to the shrinking design of the aft fuselage section, the last loading position can only accommodate small cargo containers (such as the K type) or cargo containers (such as the A type and M type) rotated 90°. This special requirement makes it necessary for the penultimate loading position to have universal transfer function so that the container in the last loading position can be adjusted and smoothly enter the last loading area.

[0005] Therefore, it is necessary to consider the limitations of adjacent bidirectional movement limiting devices being too close together in the integrated layout of different configuration container units, making it impossible to install ball bearing transmission components separately. Structural design of air cargo movement limiting devices should be carried out to meet the loading requirements of universal transmission and bidirectional movement limiting, and further improve loading compatibility. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned technologies, this utility model provides a device to ensure the smooth loading and unloading of container units and to reliably limit their movement.

[0007] The technical solution adopted by this utility model to overcome its technical problem is: A universal transfer and bidirectional movement limiting device for civil aircraft cargo container units includes: The base has an internal cavity and is fixed to the floor rails in the aircraft cargo hold by a fixing mechanism. Four ball seats are respectively set at the four corners of the base, and a steel ball is rotatably installed in each ball seat; The left pawl has its tail end rotated and installed in the receiving cavity of the base via a rotating mechanism I, and its head end is provided with a positioning block I; The right pawl has its tail end rotated and installed in the receiving cavity of the base via a rotating mechanism II, and its head end is provided with a positioning block II. The left pawl has an opening slot, and the right pawl has a convex shape. In the initial state, the left and right pawls rotate to be inside the receiving cavity, and the head of the right pawl is inserted into the opening slot of the left pawl. The top of the steel ball is higher than the top of the base. When the left pawl rotates upward to an obtuse angle and the right pawl rotates upward to an acute angle, the left and right pawls are locked together in an X-shape by the locking mechanism, and the positioning block I is horizontally facing the right side and the positioning block II is horizontally facing the left side.

[0008] Furthermore, the aforementioned fixing mechanism is a bolt, which is used to lock and fix the base on the floor slide rail.

[0009] Furthermore, the aforementioned rotating mechanism I is a pin I mounted on the base. The axis of the pin I is horizontally arranged in the front-to-back direction, and the tail end of the left pawl is provided with a through hole I, in which the pin I is inserted.

[0010] Furthermore, the aforementioned rotating mechanism II is a pin II mounted on the base. The axis of the pin II is horizontally arranged in the front-to-back direction. The tail end of the right pawl is provided with a through hole II, and the pin II is inserted into the through hole II.

[0011] For ease of assembly, the head end of the aforementioned pin I is locked and fixed relative to the base by a cotter pin I.

[0012] For ease of assembly, the head end of pin II is locked and fixed relative to the base by cotter pin II.

[0013] Furthermore, the locking mechanism includes shoulder grooves respectively disposed on the left and right sides of the right pawl and limiting grooves II disposed on the upper end of each shoulder groove. Limiting grooves I are respectively disposed on the left and right ends of the opening groove of the left pawl, and limiting grooves III are respectively disposed on the left and right ends of the opening groove of the left pawl and above the limiting grooves I. When the left pawl rotates upward to an obtuse angle and the right pawl rotates upward to an acute angle, the upper left and right sides of the right pawl are placed in the corresponding limiting grooves III of the left pawl on the same side. The upper end surfaces between the limiting grooves II and the shoulder grooves on the left and right sides of the right pawl are placed in the corresponding limiting grooves I on the same side. The lower left and right sides of the left pawl are placed in the corresponding shoulder grooves on the same side, and the upper left and right sides of the left pawl are placed in the corresponding limiting grooves II on the same side.

[0014] To facilitate reset, a torsion spring I is also included, which is mounted on pin I. One arm of the torsion spring I is fixed to the base, and the other arm is fixed to the left pawl. A torsion spring II is also included, which is mounted on pin II. One arm of the torsion spring II is fixed to the base, and the other arm is fixed to the right pawl. When the torsion spring I and the torsion spring II are in their natural state, both the left and right pawls rotate to be located inside the receiving cavity.

[0015] The beneficial effects of this utility model are as follows: The left and right pawls are locked and fixed by a locking mechanism, forming a stable X-shaped structure. When one container unit contacts the positioning block I, the left pawl is subjected to force, and due to the support of the right pawl, it will not rotate backward. When the other container unit contacts the positioning block II, the right pawl is subjected to force, and due to the support of the left pawl, it will not rotate forward, thus achieving bidirectional movement restriction of the container unit. It is suitable for situations where the distance between two adjacent bidirectional movement restriction devices in the integrated layout of container units with different configurations is close, making it impossible to install ball bearing devices separately. This improves the compatibility and adaptability of the freight system, ensuring smooth loading and unloading of container units and reliable movement restriction. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the pawl of this utility model in the unlocked state; Figure 2 This is a three-dimensional structural diagram of the pawl of this utility model in the locked state; Figure 3 This is an installation diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the left pawl of this utility model; Figure 5 This is a three-dimensional structural diagram of the right pawl of this utility model; In the diagram, 1. Base; 2. Bolt; 3. Ball seat; 4. Steel ball; 5. Left pawl; 6. Pin I; 7. Cotter pin I; 8. Right pawl; 9. Pin II; 10. Cotter pin II; 11. Torsion spring I; 12. Torsion spring II; 13. Limiting groove I; 14. Receiving cavity; 15. Shoulder groove; 16. Floor slide rail; 17. Opening groove; 18. Limiting groove II; 19. Limiting groove III; 51. Positioning block I; 52. Through hole I; 81. Positioning block II; 82. Through hole II. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 The present invention will be further described below.

[0018] A universal transfer and bidirectional movement limiting device for a cargo container unit of a civil aircraft includes: a base 1 with an internal receiving cavity 14, the base 1 being fixed to a floor rail 16 in the aircraft cargo hold by a fixing mechanism; four ball seats 3, respectively disposed at the four corners of the base 1, each ball seat 3 having a steel ball 4 rotatably mounted therein; a left pawl 5, the tail end of which is rotatably mounted in the receiving cavity 14 of the base 1 via a rotating mechanism I, and the head end of which is provided with a positioning block I 51; and a right pawl 8, the tail end of which is rotatably mounted in the receiving cavity 14 of the base 1 via a rotating mechanism II, and the head end of which is provided with a positioning block II. 81; The left pawl 5 is provided with an opening groove 17, and the right pawl 8 is a convex-shaped mechanism. In the initial state, the left pawl 5 and the right pawl 8 rotate to be located inside the receiving cavity 14, and the head end of the right pawl 8 is inserted into the opening groove 17 of the left pawl 5. The top of the steel ball 4 is higher than the upper end of the base 1. When the left pawl 5 rotates upward to an obtuse angle and the right pawl 8 rotates upward to an acute angle, the left pawl 5 and the right pawl 8 are locked to each other in an X-shape by the locking mechanism, and the positioning block I 51 is horizontally facing the right side and the positioning block II 81 is horizontally facing the left side. When it is necessary to fix the container unit, the base 1 is fixed to the area between adjacent container units. The lower end face of the container unit is located on each steel ball 4. The left pawl 5 is rotated upward to an obtuse angle and the right pawl 8 is rotated upward to an acute angle. At this time, the left pawl 5 and the right pawl 8 are locked and fixed by the locking mechanism. The left pawl 5 and the right pawl 8 form a stable X-shaped structure. After the container unit on one side contacts the positioning block I 51, the left pawl 5 is subjected to force. Due to the support of the right pawl 8, it will not rotate back. After the container unit on the other side contacts the positioning block II 81, the right pawl 8 is subjected to force. Due to the support of the left pawl 5, it will not rotate forward. This achieves bidirectional movement restriction of the container unit. When the movement restriction of the container unit is not required, the locking mechanism of the left pawl 5 and right pawl 8 is released, and the left pawl 5 and right pawl 8 rotate back into the receiving cavity 14 located on the base 1. At this time, the top of the steel ball 4 is at its highest point, so the container unit can smoothly slide relative to the base 1 through the rotation of the steel ball 4, realizing the universal transfer function of the container unit. This allows the container unit in the last loading position to adjust its position and smoothly enter the last loading area. It is suitable for situations where the distance between two adjacent bidirectional movement restriction devices in the integrated layout of container units with different configurations is close, and it is not possible to install the ball bearing device alone. This improves the compatibility and adaptability of the freight system and ensures smooth loading and unloading and reliable movement restriction of the container unit.

[0019] In one embodiment of the utility model, the fixing mechanism is a bolt 2, which locks and fixes the base 1 onto the floor slide rail 16 after it is placed on the floor slide rail 16. The bolt 2 makes it easy to fix the base 1 onto the floor slide rail 16 in the aircraft cargo hold, and the installation and disassembly are convenient.

[0020] In one embodiment of the utility model, the rotating mechanism I is a pin I 6 mounted on the base 1, with the axis of pin I 6 horizontally arranged in the front-to-back direction. The tail end of the left pawl 5 has a through hole I 52, into which pin I 6 is inserted. The rotating mechanism II is a pin II 9 mounted on the base 1, with the axis of pin II 9 horizontally arranged in the front-to-back direction. The tail end of the right pawl 8 has a through hole II 82, into which pin II 9 is inserted. The left pawl 5 can rotate around pin I 6 through the through hole I 52, and the right pawl 8 can rotate around pin II 9 through the through hole II 82. The structure is simple and the rotation is smooth.

[0021] In one embodiment of the utility model, the head end of pin I 6 is locked and fixed relative to base 1 by cotter pin I 7. The head end of pin II 9 is locked and fixed relative to base 1 by cotter pin II 10. Fixing pin I 6 with cotter pin I 7 achieves axial locking and fixation relative to base 1, and fixing pin II 9 with cotter pin II 10 achieves axial locking and fixation relative to base 1. This method is convenient to install and provides reliable fixation.

[0022] In one embodiment of the utility model, the locking mechanism includes shoulder grooves 15 respectively disposed on the left and right sides of the right pawl 8 and limiting grooves II 18 disposed on the upper end of each shoulder groove 15. Limiting grooves I 13 are respectively disposed on the left and right ends of the opening groove 17 of the left pawl 5. Limiting grooves III 19 are respectively disposed on the left and right ends of the opening groove 17 of the left pawl 5 and above the limiting grooves I 13. When the left pawl 5 rotates upward to an obtuse angle and the right pawl 8 rotates upward to an acute angle, the upper left and right sides of the right pawl 8 are placed in the corresponding limiting grooves III 19 of the left pawl 5 on the same side. The upper end surfaces of the limiting grooves II 18 on the left and right sides of the right pawl 8 and the shoulder grooves 15 are placed in the corresponding limiting grooves I 13 on the same side. The lower left and right sides of the left pawl 5 are placed in the corresponding shoulder grooves 15 on the same side. The upper left and right sides of the left pawl 5 are placed in the corresponding limiting grooves II 18 on the same side. When the left pawl 5 rotates upward to an obtuse angle and the right pawl 8 rotates upward to an acute angle, they form an X-shaped connection. At this time, when the container unit applies pressure to the right pawl 8, the right pawl 8 transmits the force to the limiting groove I 13. Since the upper left and right sides of the right pawl 8 are placed in the corresponding limiting groove I 13 of the left pawl 5 on the same side, the left pawl 5 has a tendency to continue rotating. However, since the left pawl 5 is in contact with the shoulder groove 15 of the right pawl 8, it cannot rotate. When the container unit applies pressure to the left pawl 5, the left pawl 5 tends to rotate back. The upper left and right sides of the right pawl 8 are placed in the corresponding limiting grooves Ⅲ 19 of the left pawl 5 on the same side. Therefore, it transmits the force to the right pawl 8, causing the right pawl 8 to tend to rotate back. However, after the right pawl 8 contacts the lower end of the left pawl 5 through the shoulder groove 15, the left pawl 5 is in an obtuse angle state. Therefore, the left pawl 5 and the right pawl 8 are locked together and cannot rotate. When unlocking is required, first rotate the right pawl 8 toward the receiving cavity 14, so that the shoulder groove 15 contacts the lower end face of the left pawl 5, but the upper end face of the right pawl 8 leaves the limiting groove I 13 and the upper end face of the right pawl 8 leaves the limiting groove III 19. At this time, rotate the left pawl 5 and the right pawl 8 at the same time, so that the right pawl 8 rotates away from the limiting groove I 13 and the limiting groove III 19 of the left pawl 5, and it completely enters the opening groove 17 of the left pawl 5. At this time, the left pawl 5 and the right pawl 8 are unlocked, and the left pawl 5 and the right pawl 8 can be rotated to be completely hidden in the receiving cavity 14 of the base 1.

[0023] In one embodiment of the utility model, a torsion spring I 11 is also included, which is mounted on pin I 6. One arm of the torsion spring I 11 is fixed to the base 1, and the other arm is fixed to the left pawl 5. A torsion spring II 12 is also included, which is mounted on pin II 10. One arm of the torsion spring II 12 is fixed to the base 1, and the other arm is fixed to the right pawl 8. When torsion springs I 11 and II 12 are in their natural state, both the left pawl 5 and the right pawl 8 rotate to be inside the receiving cavity 14. When the left pawl 5 rotates upward to an obtuse angle and the right pawl 8 rotates upward to an acute angle, both torsion springs I 11 and II 12 are in a compression and energy storage stage. When manually unlocked, torsion springs I 11 and II 12 release energy to drive the left pawl 5 and the right pawl 8 to rotate into the receiving cavity 14 of the base 1 for storage.

[0024] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A universal transfer and bidirectional movement limiting device for civil aircraft cargo container units, characterized in that, include: The base (1) has a cavity (14) inside it and is fixed to the floor rail (16) in the cargo hold of the aircraft by a fixing mechanism; Four ball seats (3) are respectively set at the four corners of the base (1), and a steel ball (4) is rotatably installed in each ball seat (3). The left pawl (5) has its tail end rotated and installed in the receiving cavity (14) of the base (1) through the rotating mechanism I, and its head end is provided with a positioning block I (51). The right pawl (8) has its tail end rotated and installed in the receiving cavity (14) of the base (1) through the rotating mechanism II, and its head end is provided with a positioning block II (81). The left pawl (5) is provided with an opening groove (17), and the right pawl (8) is a convex-shaped mechanism. In the initial state, the left pawl (5) and the right pawl (8) rotate to be located inside the receiving cavity (14), and the head end of the right pawl (8) is inserted into the opening groove (17) of the left pawl (5). The top of the steel ball (4) is higher than the upper end of the base (1). When the left pawl (5) rotates upward to an obtuse angle and the right pawl (8) rotates upward to an acute angle, the left pawl (5) and the right pawl (8) are locked together in an X-shape by the locking mechanism, and the positioning block I (51) is horizontally facing the right side and the positioning block II (81) is horizontally facing the left side.

2. The universal transmission and bidirectional movement limiting device for civil aircraft cargo container units according to claim 1, characterized in that: The fixing mechanism is a bolt (2), which is used to lock and fix the base (1) on the floor slide rail (16).

3. The universal transmission and bidirectional movement limiting device for civil aircraft cargo container units according to claim 1, characterized in that: The rotating mechanism I is a pin I (6) mounted on the base (1). The axis of the pin I (6) is set horizontally in the front-back direction. The tail end of the left pawl (5) is provided with a through hole I (52), and the pin I (6) is inserted into the through hole I (52).

4. The universal transmission and bidirectional movement limiting device for civil aircraft cargo container units according to claim 3, characterized in that: The rotating mechanism II is a pin II (9) mounted on the base (1). The axis of the pin II (9) is set horizontally in the front-back direction. The tail end of the right pawl (8) is provided with a through hole II (82). The pin II (9) is inserted into the through hole II (82).

5. The universal transmission and bidirectional movement limiting device for civil aircraft cargo container units according to claim 3, characterized in that: The head end of the pin I (6) is locked and fixed relative to the base (1) by the cotter pin I (7).

6. The universal transmission and bidirectional movement limiting device for civil aircraft cargo container units according to claim 4, characterized in that: The head end of pin II (9) is locked and fixed relative to the base (1) by cotter pin II (10).

7. The universal transmission and bidirectional movement limiting device for civil aircraft cargo container units according to claim 1, characterized in that: The locking mechanism includes shoulder grooves (15) respectively located on the left and right sides of the right pawl (8) and limiting grooves II (18) located on the upper end of each shoulder groove (15). Limiting grooves I (13) are respectively provided at the left and right ends of the opening groove (17) of the left pawl (5). Limiting grooves III (19) are respectively provided at the left and right ends of the opening groove (17) of the left pawl (5) and above the limiting grooves I (13). When the left pawl (5) rotates upward to an obtuse angle and the right pawl (8) moves towards... When the upper part is rotated to an acute angle, the upper left and right sides of the right pawl (8) are placed in the corresponding limiting groove Ⅲ (19) of the left pawl (5) on the same side. The upper end surface between the limiting groove Ⅱ (18) and the shoulder groove (15) on the left and right sides of the right pawl (8) is placed in the corresponding limiting groove Ⅰ (13) on the same side. The lower left and right sides of the left pawl (5) are placed in the corresponding shoulder groove (15) on the same side. The upper left and right sides of the left pawl (5) are placed in the corresponding limiting groove Ⅱ (18) on the same side.

8. The universal transmission and bidirectional movement limiting device for civil aircraft cargo container units according to claim 1, characterized in that: It also includes a torsion spring I (11) on the set and pin I (6), one arm of the torsion spring I (11) is fixed on the base (1), and the other arm is fixed on the left pawl (5). It also includes a torsion spring II (12) on the set and pin II (10), one arm of the torsion spring II (12) is fixed on the base (1), and the other arm is fixed on the right pawl (8). When the torsion spring I (11) and the torsion spring II (12) are in their natural state, the left pawl (5) and the right pawl (8) rotate to be located inside the receiving cavity (14).

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