A damaged aircraft fast towing system trailer loading and unloading linkage bridge plate mechanism

Abstract

The application relates to the field of aviation technology and discloses a trailer loading and unloading linkage bridge plate mechanism of a damaged aircraft fast dragging system, which comprises a vehicle body, liftable driving wheels arranged at the front end and the rear end of the vehicle body, load bearing wheel lifting structures symmetrically arranged at the left side and the right side of the vehicle body, first hydraulic cylinders, second hydraulic cylinders, first load bearing wheels, second load bearing wheels, first rotating supports and second rotating supports, the first rotating supports and the second rotating supports each comprising first hinged positions, second hinged positions and third hinged positions which are in a triangular distribution, two first hinged positions being rotationally connected with the vehicle body, and two second hinged positions being rotationally connected with the first load bearing wheels and the second load bearing wheels respectively. The trailer loading and unloading linkage bridge plate mechanism of the damaged aircraft fast dragging system provided by the application solves the problems that four wheels are used as driving wheels and load bearing wheels in the prior art, the reliability is low, and the transfer efficiency on the landing gear is low.

Description

Technical Field

[0001] This invention relates to the field of aviation technology, and more specifically to a trailer loading and unloading linkage bridge mechanism for a rapid towing system for damaged aircraft. Background Technology

[0002] When an aircraft experiences an anomaly during takeoff or landing, resulting in landing gear damage and disrupting normal airport operations, specialized moving equipment is required for emergency relocation and rescue. Several existing patented technologies for tow trucks used for landing gear malfunction relocation have technical flaws, being neither stable, fast enough, nor safe enough. Therefore, there is a need to design a new type of emergency towing device that can be both fast and safe for loading and unloading. Summary of the Invention

[0003] The purpose of this invention is to provide a trailer loading and unloading linkage bridge mechanism for a rapid towing system for damaged aircraft, in order to solve at least one of the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A trailer loading and unloading linkage bridge mechanism for a rapid towing system for damaged aircraft includes a vehicle body. The front and rear ends of the vehicle body are respectively provided with liftable drive wheels. The left and right sides of the vehicle body are symmetrically provided with load-bearing wheel lifting structures. Each load-bearing wheel lifting structure includes a first hydraulic cylinder, a second hydraulic cylinder, a first load-bearing wheel, a second load-bearing wheel, a first rotating bracket, and a second rotating bracket. Both the first and second rotating brackets include a first hinge position, a second hinge position, and a third hinge position arranged in a triangular pattern. The two first hinge positions are rotatably connected to the vehicle body, and the two second hinge positions are rotatably connected to the first and second load-bearing wheels, respectively. The first hydraulic cylinder is located between the first hinge position of the first rotating bracket and the third hinge position of the second rotating bracket, and the second hydraulic cylinder is located between the third hinge position of the first rotating bracket and the first hinge position of the second rotating bracket.

[0006] The rear end of the vehicle body is rotatably connected to a liftable bridge plate, which includes a bridge plate, a rotating shaft, and a pressure-applying part. The bridge plate is rotatably connected to the rear end of the vehicle body via the rotating shaft. The pressure-applying part is located near the rotating shaft and extends outward. During the clockwise rotation of the second rotating bracket, it abuts against the pressure-applying part and continuously applies pressure, thereby driving the bridge plate to swing away from the ground with the rotating shaft as the rotation center. During the counterclockwise rotation of the second rotating bracket, it gradually disengages from the pressure-applying part, causing the bridge plate to swing towards the ground with the rotating shaft as the rotation center under its own weight.

[0007] In this technical solution, the front and rear ends of the vehicle body are equipped with liftable drive wheels, and the left and right sides of the vehicle body are symmetrically equipped with lifting structures for load-bearing wheels. The combination of the liftable drive wheels and the lifting structures for load-bearing wheels allows for switching between the use of drive wheels and load-bearing wheels as needed. The drive wheels are easier to control and more flexible during operation, enabling the vehicle body to move more accurately to a suitable position for loading the landing gear. Simultaneously, when the landing gear is loaded onto the vehicle body, due to its weight, lowering the load-bearing wheels and raising the drive wheels allows the load-bearing wheels to act as follow-up wheels under the action of an external trailer, achieving reliable and efficient transfer of the landing gear. When the load-bearing wheels are in the lowered state, the drive wheels are not in contact with the ground, thus the drive wheels do not need to bear the weight of the landing gear, ensuring their service life. When the load-bearing wheels are in the raised state, the drive wheels are in the lowered state and in contact with the ground. Because the drive wheels are smaller than the load-bearing wheels and have a self-drive system, their steering and movement are more flexible, enabling more efficient movement of the vehicle body to a suitable position for loading the landing gear. Specifically, when the landing gear has been installed on the vehicle body and needs to be transferred, the first hydraulic cylinder and the second hydraulic cylinder simultaneously drive the first rotating bracket and the second rotating bracket to rotate around the first hinge position as the fulcrum. Specifically, the first rotating bracket rotates counterclockwise and the second rotating bracket rotates clockwise, which realizes the lowering of the first and second load-bearing wheels until the first and second load-bearing wheels lift the vehicle body to a suitable height position. Then, the vehicle body is pulled by an external trailer to realize the transfer of the landing gear. The load-bearing wheels have the functions of bearing weight and following movement, which can work with the external trailer to reliably and efficiently realize the transfer of the landing gear.

[0008] Because the rear end of the vehicle body is rotatably connected to a liftable bridge plate, the second rotating support can achieve a linkage effect with the bridge plate during rotation through the setting of the rotating shaft and the pressure application part. That is, when the landing gear needs to be loaded, the first hydraulic cylinder drives the second rotating support to swing counterclockwise, and the bridge plate falls to contact the ground under its own weight, thus facilitating the movement of the landing gear onto the vehicle body. After the landing gear is on the vehicle body, the first and second hydraulic cylinders simultaneously drive the first and second rotating supports to swing counterclockwise and clockwise respectively, so that the first and second load-bearing wheels are in a lowered state. During this process, the second rotating support continuously applies pressure to the pressure application part, thereby driving the bridge plate to swing away from the ground around the rotating shaft, achieving an upward effect on the bridge plate, and detaching the bridge plate from the ground to facilitate the subsequent movement of the vehicle body. Through the above-mentioned linkage structure design of the load-bearing wheels and the bridge plate, the loading and transfer of the landing gear can be realized more conveniently and quickly.

[0009] Furthermore, to provide a more convenient first and second rotating bracket for installing the first hydraulic cylinder, the second hydraulic cylinder, the first bearing wheel, and the second bearing wheel, both the first and second rotating brackets include an outer bracket and an inner bracket. A first connecting rod is provided at the first hinge position, a second connecting rod is provided at the second hinge position, and a third connecting rod is provided at the third hinge position. The inner end of the first connecting rod is rotatably connected to the vehicle body. The first bearing wheel and the second bearing wheel are respectively rotatably connected to their respective second connecting rods. One end of the first hydraulic cylinder is rotatably connected to the first connecting rod of the first rotating bracket, and the other end of the first hydraulic cylinder is rotatably connected to the third connecting rod of the second rotating bracket. One end of the second hydraulic cylinder is rotatably connected to the first connecting rod of the second rotating bracket, and the other end of the second hydraulic cylinder is rotatably connected to the third connecting rod of the first rotating bracket.

[0010] Furthermore, in order to achieve a smoother transfer of the landing gear, the vehicle body includes two symmetrically arranged side beams, and the lifting structure of the load-bearing wheel is arranged on the side beams.

[0011] Furthermore, to improve safety during landing gear transfer, the rear end of the side beam is provided with an inclined surface. To reduce ground friction and facilitate easier movement of the landing gear onto the vehicle body, a concealed compartment is provided on the inclined surface, and the compartment contains friction-reducing material.

[0012] Furthermore, the bridge plate is equipped with anti-slip teeth and a rotating roller. The rotating roller is located at the upper end of the bridge plate, and its two ends are rotatably engaged with the vehicle body. The rotating roller can roll at the upper end of the bridge plate to reduce friction, making it easier to pull the landing gear onto the vehicle body.

[0013] Furthermore, to facilitate towing of the device by an external trailer, the front end of the vehicle body is a crossbeam, and a towing hook structure is provided directly in front of the crossbeam.

[0014] Furthermore, in order to provide a passage for the landing gear to move onto the vehicle body while ensuring the structural stability of the vehicle body, the vehicle body is a U-shaped body with a detachable crossbeam at the rear end.

[0015] Furthermore, to facilitate the pulling of the landing gear, the front end of the vehicle body has a winch for pulling the landing gear.

[0016] Furthermore, in order to facilitate the transfer of the landing gear to a suitable position and then push it toward the rear of the vehicle body via a hydraulic push rod so that the landing gear can be smoothly transferred from the vehicle body to the ground, the vehicle body is provided with a hydraulic push rod that pushes toward the rear of the vehicle body, and the end of the hydraulic push rod is provided with a front push claw that abuts against the landing gear tire.

[0017] Furthermore, in order to provide a specific liftable drive wheel, the drive wheel includes a wheel frame, a drive wheel body, and a telescopic drive rod. The drive wheel body is mounted on the wheel frame, and a connecting plate is provided on the wheel frame. The front end of the connecting plate located at the front end of the vehicle body is hinged to the front end of the vehicle body, and the rear end of the connecting plate located at the rear end of the vehicle body is hinged to the rear end of the vehicle body. The telescopic drive rod is disposed between the vehicle body and the corresponding connecting plate for driving the connecting plate to rotate, thereby realizing the lifting and lowering of the drive wheel body.

[0018] The beneficial effects of this invention are as follows: In this technical solution, since the front and rear ends of the vehicle body are respectively equipped with liftable drive wheels, and the left and right sides of the vehicle body are symmetrically equipped with load-bearing wheel lifting structures, the liftable drive wheels and load-bearing wheel lifting structures are combined, allowing for switching between the use of drive wheels and load-bearing wheels according to usage needs. The drive wheels are easier to control and more flexible during operation, enabling the vehicle body to move more accurately to a suitable position for loading the landing gear. Simultaneously, when the landing gear is loaded onto the vehicle body, due to its weight, lowering the load-bearing wheels and raising the drive wheels allows the load-bearing wheels to act as follow-up wheels under the action of an external trailer, achieving reliable and efficient transfer of the landing gear. When the load-bearing wheels are in the lowered state, the drive wheels are not in contact with the ground, thus the drive wheels do not need to bear the weight of the landing gear, ensuring the service life of the drive wheels. When the load-bearing wheels are in the raised state, the drive wheels are in the lowered state and in contact with the ground. Since the drive wheels are smaller than the load-bearing wheels and have a self-drive system, their steering and movement are more flexible, enabling more efficient movement of the vehicle body to a position suitable for loading the landing gear. Specifically, when the landing gear has been installed on the vehicle body and needs to be transferred, the first hydraulic cylinder and the second hydraulic cylinder simultaneously drive the first rotating bracket and the second rotating bracket to rotate around the first hinge position as the fulcrum. Specifically, the first rotating bracket rotates counterclockwise and the second rotating bracket rotates clockwise, which realizes the lowering of the first and second load-bearing wheels until the first and second load-bearing wheels lift the vehicle body to a suitable height position. Then, the vehicle body is pulled by an external trailer to realize the transfer of the landing gear. The load-bearing wheels have the functions of bearing weight and following movement, which can work with the external trailer to reliably and efficiently realize the transfer of the landing gear.

[0019] Because the rear end of the vehicle body is rotatably connected to a liftable bridge plate, the second rotating support can achieve a linkage effect with the bridge plate during rotation through the setting of the rotating shaft and the pressure application part. That is, when the landing gear needs to be loaded, the first hydraulic cylinder drives the second rotating support to swing counterclockwise, and the bridge plate falls to contact the ground under its own weight, thus facilitating the movement of the landing gear onto the vehicle body. After the landing gear is on the vehicle body, the first and second hydraulic cylinders simultaneously drive the first and second rotating supports to swing counterclockwise and clockwise respectively, so that the first and second load-bearing wheels are in a lowered state. During this process, the second rotating support continuously applies pressure to the pressure application part, thereby driving the bridge plate to swing away from the ground around the rotating shaft, achieving an upward effect on the bridge plate, and detaching the bridge plate from the ground to facilitate the subsequent movement of the vehicle body. Through the above-mentioned linkage structure design of the load-bearing wheels and the bridge plate, the loading and transfer of the landing gear can be realized more conveniently and quickly. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram from a first perspective of the present invention;

[0021] Figure 2 This is a structural schematic diagram from a second perspective of the present invention;

[0022] Figure 3 This is a structural schematic diagram of the invention from a third perspective;

[0023] Figure 4 This is a structural schematic diagram from a fourth perspective of the present invention;

[0024] Figure 5 This is a partially enlarged view of the linkage structure between the load-bearing wheel and the bridge plate in this invention;

[0025] Figure 6 This is a schematic diagram of the structure of the bridge plate with anti-slip teeth in this invention.

[0026] In the diagram: 1. First hydraulic cylinder; 2. Second hydraulic cylinder; 3. First bearing wheel; 4. Second bearing wheel; 5. First rotating bracket; 6. Second rotating bracket; 7. First hinge position; 8. Second hinge position; 9. Third hinge position; 10. Outer bracket; 11. Inner bracket; 12. Landing gear; 14. Third connecting rod; 15. Inclined surface; 16. Hidden compartment; 17. Crossbeam; 18. Traction hook structure; 19. Winch; 20. Hydraulic push rod; 21. Front push claw; 22. Drive wheel; 22. Wheel frame; 22.1. Drive wheel body; 22.2. Telescopic drive rod; 22.3. Connecting plate; 22.4. Side beam; 23. Bridge plate; 24. Rotating shaft; 25. Pressure application part; 26. Wheel axle; 27. First connecting rod; 28. Anti-slip teeth; 29. ​​Rotating roller; 30. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0028] Example 1:

[0029] like Figures 1-6 As shown, this embodiment provides a trailer loading and unloading linkage bridge mechanism for a rapid towing system for damaged aircraft. It includes a vehicle body with liftable drive wheels 22 at both the front and rear ends. Symmetrical lifting structures for load-bearing wheels are located on the left and right sides of the vehicle body. Each lifting structure includes a first hydraulic cylinder 1, a second hydraulic cylinder 2, a first load-bearing wheel 3, a second load-bearing wheel 4, a first rotating bracket 5, and a second rotating bracket 6. Both the first and second rotating brackets include a first hinge position 7, a second hinge position 8, and a third hinge position 9 arranged in a triangular pattern. The two first hinge positions 7 are rotatably connected to the vehicle body, and the two second hinge positions 8 are rotatably connected to the first load-bearing wheel 3 and the second load-bearing wheel 4, respectively. The first hydraulic cylinder 1 is positioned between the first hinge position 7 of the first rotating bracket 5 and the third hinge position 9 of the second rotating bracket 6, and the second hydraulic cylinder 2 is positioned between the third hinge position 9 of the first rotating bracket 5 and the first hinge position 7 of the second rotating bracket 6. Specifically, the first hydraulic cylinder 1 and the second hydraulic cylinder 2 are arranged in an alternating manner between the first rotating bracket 5 and the second rotating bracket 6.

[0030] A liftable bridge plate is rotatably connected to the rear end of the vehicle body. The liftable bridge plate includes a bridge plate 24, a rotating shaft 25, and a pressure-applying part 26. The bridge plate 24 is rotatably connected to the rear end of the vehicle body via the rotating shaft 25. The pressure-applying part 26 is located near the rotating shaft 25 and extends outward. During clockwise rotation, the second rotating bracket 6 abuts against the pressure-applying part 26 and continuously applies pressure, thereby driving the bridge plate 24 to swing away from the ground around the rotating shaft 25. During counterclockwise rotation, the second rotating bracket 6 gradually disengages from the pressure-applying part 26, causing the bridge plate 24 to swing towards the ground around the rotating shaft 25 under its own weight. Specifically, to improve the smoothness of the bridge plate linkage, an axle 27 is provided on the pressure-applying part 26.

[0031] In this technical solution, the front and rear ends of the vehicle body are respectively equipped with liftable drive wheels 22, and the left and right sides of the vehicle body are symmetrically equipped with load-bearing wheel lifting structures. The liftable drive wheels 22 and the load-bearing wheel lifting structures are combined, and the use of drive wheels 22 and load-bearing wheels can be switched according to the needs of use. The drive wheels 22 are easy to control and more flexible during the driving process, so that the vehicle body can be moved more accurately to a suitable position for loading the landing gear 12. At the same time, when the landing gear 12 is loaded onto the vehicle body, since the landing gear 12 is relatively heavy, the load-bearing wheels are lowered and the drive wheels 22 are raised. Under the action of the external trailer, the load-bearing wheels act as follow-up wheels, realizing reliable and efficient transfer of the landing gear 12. When the load-bearing wheel is in the lowered state, the drive wheel 22 is not in contact with the ground, so the drive wheel 22 does not need to bear the weight of the landing gear 12, which can ensure the service life of the drive wheel 22. When the load-bearing wheel is in the raised state, the drive wheel 22 is in the lowered state and in contact with the ground. Since the drive wheel 22 is smaller than the load-bearing wheel and has a self-drive system, its steering and movement are more flexible, and it can move the vehicle body to a position that is convenient for loading the landing gear 12 more efficiently. Specifically, when the landing gear 12 has been loaded onto the vehicle body and needs to be transferred, the first hydraulic cylinder 1 and the second hydraulic cylinder 2 simultaneously drive the first rotating support 5 and the second rotating support 6 to rotate around the first hinge position. Specifically, the first rotating support 5 rotates counterclockwise and the second rotating support 6 rotates clockwise, thereby lowering the first bearing wheel 3 and the second bearing wheel 4 until the first bearing wheel 3 and the second bearing wheel 4 raise the vehicle body to a suitable height. Then, the vehicle body is pulled by an external trailer to transfer the landing gear 12. The bearing wheels have the functions of bearing weight and following movement, and can work with the external trailer to reliably and efficiently transfer the landing gear 12.

[0032] Because the rear end of the vehicle body is rotatably connected to a liftable bridge plate 24, the second rotating support 6 can achieve a linkage effect with the bridge plate 24 during rotation through the setting of the rotating shaft 25 and the pressure part 26. That is, when the landing gear 12 needs to be loaded, the first hydraulic cylinder 1 drives the second rotating support 6 to swing counterclockwise, and the second rotating support 6 disengages from the pressure part 26. Then, the bridge plate 24 falls to contact the ground under its own weight, which facilitates the movement of the landing gear 12 onto the vehicle body. After the landing gear 12 is moved onto the vehicle body, the first hydraulic cylinder 1 and the second hydraulic cylinder 2 simultaneously drive the first rotating support 5 and the second rotating support 6 to swing counterclockwise and clockwise respectively, so that the first bearing wheel 3 and the second bearing wheel 4 are in a lowering state. During this process, the second rotating support 6 will continuously apply pressure to the pressure part 26, thereby driving the bridge plate 24 to swing away from the ground with the rotating shaft 25 as the rotation center, realizing the upward tilting effect of the bridge plate 24, and the bridge plate 24 disengages from the ground to facilitate the subsequent movement of the vehicle body. The linkage structure design of the bearing wheel and bridge plate 24 makes it easier and faster to load and transfer the landing gear 12.

[0033] The first load-bearing wheel 3 and the second load-bearing wheel 4 mentioned above can be increased or decreased according to load-bearing requirements.

[0034] Example 2:

[0035] This embodiment is an optimization based on the above embodiment 1.

[0036] To provide a more convenient first rotating bracket 5 and second rotating bracket 6 for installing the first hydraulic cylinder 1, the second hydraulic cylinder 2, the first bearing wheel 3, and the second bearing wheel 4, both the first rotating bracket 5 and the second rotating bracket 6 include an outer bracket 10 and an inner bracket 11. A first connecting rod 28 is provided at the first hinge position 7, a second connecting rod is provided at the second hinge position 8, and a third connecting rod 14 is provided at the third hinge position 9. The inner end of the first connecting rod 28 is rotatably connected to the vehicle body. The first bearing wheel 3 and the second bearing wheel 4 are respectively rotatably connected to the corresponding second connecting rods. One end of the first hydraulic cylinder 1 is rotatably connected to the first connecting rod 28 of the first rotating bracket 5, and the other end of the first hydraulic cylinder 1 is rotatably connected to the third connecting rod 14 of the second rotating bracket 6. One end of the second hydraulic cylinder 2 is rotatably connected to the first connecting rod 28 of the second rotating bracket 6, and the other end of the second hydraulic cylinder 2 is rotatably connected to the third connecting rod 14 of the first rotating bracket 5.

[0037] Example 3:

[0038] This embodiment is an optimization based on the above embodiment 1.

[0039] To achieve a smoother transfer of the landing gear 12, the vehicle body includes two symmetrically arranged side beams 23, and the load-bearing wheel lifting structure is installed on the side beams 23.

[0040] Example 4:

[0041] This embodiment is an optimization based on the above embodiment 3.

[0042] To improve safety during the transfer of the landing gear 12, the rear end of the side beam is provided with an inclined surface 15. To reduce ground friction and make it easier to move the landing gear 12 onto the vehicle body, a hidden compartment 16 is provided on the inclined surface 15, and the hidden compartment 16 is filled with friction-reducing material.

[0043] Example 5:

[0044] This embodiment is an optimization based on the above embodiment 1.

[0045] like Figure 6As shown, the bridge plate 24 is provided with anti-slip teeth 29 and a rotating roller 30. The rotating roller 30 is located at the upper end of the bridge plate 24 and its two ends are in rotational engagement with the vehicle body. The rotating roller 30 can roll at the upper end of the bridge plate 24 to reduce friction, making it easier to pull the landing gear 12 onto the vehicle body.

[0046] Example 6:

[0047] This embodiment is an optimization based on the above embodiment 1.

[0048] To facilitate towing of this device by an external trailer, the front of the vehicle body is a crossbeam 17, and a towing attachment structure 18 is provided directly in front of the crossbeam 17.

[0049] Example 7:

[0050] This embodiment is an optimization based on the above embodiment 1.

[0051] To provide a passage for the landing gear 12 to move onto the vehicle body while ensuring the structural stability of the vehicle body, the vehicle body is U-shaped, with a detachable crossbeam (not shown in the figure) at the rear end of the U-shaped vehicle body.

[0052] Example 8:

[0053] This embodiment is an optimization based on the above embodiment 1.

[0054] To facilitate the pulling of the landing gear 12, the front end of the vehicle body has a winch 19 for pulling the landing gear 12.

[0055] Example 9:

[0056] This embodiment is an optimization based on the above embodiment 1.

[0057] In order to facilitate the transfer of the landing gear 12 to a suitable position and then push it toward the rear of the vehicle body by a hydraulic push rod 20 so that the landing gear 12 can be smoothly transferred from the vehicle body to the ground, the vehicle body is provided with a hydraulic push rod 20 that pushes toward the rear of the vehicle body. The end of the hydraulic push rod 20 is provided with a front push claw 21 that abuts against the tire of the landing gear 12.

[0058] Example 10:

[0059] This embodiment is an optimization based on the above embodiment 1.

[0060] To provide a specific liftable drive wheel 22, the drive wheel 22 includes a wheel frame 22.1, a drive wheel body 22.2, and a telescopic drive rod 22.3. The telescopic drive rod 22.3 can be a hydraulic telescopic rod or an electric push rod, etc. The drive wheel body 22.2 is mounted on the wheel frame 22.1, and the wheel frame 22.1 is provided with a connecting plate 22.4. The front end of the connecting plate 22.4 located at the front end of the vehicle body is hinged to the front end of the vehicle body, and the rear end of the connecting plate 22.4 located at the rear end of the vehicle body is hinged to the rear end of the vehicle body. The telescopic drive rod 22.3 is disposed between the vehicle body and the corresponding connecting plate 22.4 to drive the connecting plate 22.4 to rotate, thereby realizing the lifting and lowering of the drive wheel body 22.2.

[0061] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A trailer loading and unloading linkage bridge mechanism for a rapid towing system for damaged aircraft, characterized in that: The vehicle includes a body, with liftable drive wheels at its front and rear ends. A load-bearing wheel lifting structure is symmetrically arranged on the left and right sides of the body. The load-bearing wheel lifting structure includes a first hydraulic cylinder, a second hydraulic cylinder, a first load-bearing wheel, a second load-bearing wheel, a first rotating bracket, and a second rotating bracket. Both the first and second rotating brackets include a first hinge position, a second hinge position, and a third hinge position arranged in a triangular pattern. The two first hinge positions are rotatably connected to the vehicle body, and the two second hinge positions are rotatably connected to the first and second load-bearing wheels, respectively. The first hydraulic cylinder is positioned between the first hinge position of the first rotating bracket and the third hinge position of the second rotating bracket, and the second hydraulic cylinder is positioned between the third hinge position of the first rotating bracket and the first hinge position of the second rotating bracket. The rear end of the vehicle body is rotatably connected to a liftable bridge plate, which includes a bridge plate, a rotating shaft, and a pressure-applying part. The bridge plate is rotatably connected to the rear end of the vehicle body via the rotating shaft. The pressure-applying part is located near the rotating shaft and extends outward. During the clockwise rotation of the second rotating bracket, it abuts against the pressure-applying part and continuously applies pressure, thereby driving the bridge plate to swing away from the ground with the rotating shaft as the rotation center. During the counterclockwise rotation of the second rotating bracket, it gradually disengages from the pressure-applying part, causing the bridge plate to swing towards the ground with the rotating shaft as the rotation center under its own weight. Both the first and second rotating brackets include an outer bracket and an inner bracket. A first connecting rod is provided at the first hinge position, a second connecting rod is provided at the second hinge position, and a third connecting rod is provided at the third hinge position. The inner end of the first connecting rod is rotatably connected to the vehicle body. The first and second load-bearing wheels are respectively rotatably connected to their corresponding second connecting rods. One end of the first hydraulic cylinder is rotatably connected to the first connecting rod of the first rotating bracket, and the other end of the first hydraulic cylinder is rotatably connected to the third connecting rod of the second rotating bracket. One end of the second hydraulic cylinder is rotatably connected to the first connecting rod of the second rotating bracket, and the other end of the second hydraulic cylinder is rotatably connected to the third connecting rod of the first rotating bracket.

2. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 1, characterized in that: The vehicle body includes two symmetrically arranged side beams, and the load-bearing wheel lifting structure is installed on the side beams.

3. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 2, characterized in that: The rear end of the side beam is provided with an inclined surface, and a hidden compartment is provided on the inclined surface. The hidden compartment is provided with friction-reducing material.

4. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 1, characterized in that: The bridge plate is equipped with anti-slip teeth and rotating rods. The rotating rods are located at the upper end of the bridge plate and their two ends are in rotational cooperation with the vehicle body.

5. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 1, characterized in that: The front end of the vehicle body is a crossbeam, and a traction hook-up structure is provided directly in front of the crossbeam.

6. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 1, characterized in that: The vehicle body is U-shaped, and the rear end of the U-shaped vehicle body has a detachable crossbeam.

7. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 1, characterized in that: The front end of the vehicle body has a winch for pulling the landing gear.

8. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 1, characterized in that: The vehicle body is equipped with a hydraulic push rod that pushes towards the rear of the vehicle body, and the end of the hydraulic push rod is equipped with a front push claw that abuts against the landing gear tire.

9. The trailer loading and unloading linkage bridge mechanism of the rapid towing system for damaged aircraft according to claim 1, characterized in that: The drive wheel includes a wheel frame, a drive wheel body, and a telescopic drive rod. The drive wheel body is mounted on the wheel frame, and a connecting plate is provided on the wheel frame. The front end of the connecting plate located at the front end of the vehicle body is hinged to the front end of the vehicle body, and the rear end of the connecting plate located at the rear end of the vehicle body is hinged to the rear end of the vehicle body. The telescopic drive rod is located between the vehicle body and the corresponding connecting plate to drive the connecting plate to rotate, thereby realizing the lifting and lowering of the drive wheel body.

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