Emergency evacuation structure for airport special vehicle

Abstract

The utility model relates to an emergency evacuation structure for an airport special vehicle, and relates to the technical field of airport special vehicles. The emergency evacuation structure comprises a mounting base, a hand brake assembly, a rotating shaft rotationally arranged on the mounting base, a driving piece used for driving the rotating shaft to rotate and a driven gear connected with a transmission shaft of the special vehicle. A driving gear is in circumferential limiting and axial sliding connection with the rotating shaft, a shifting fork is arranged at one end of the mounting base in a sliding mode, and one end of the shifting fork is connected with the driving gear and can drive the driving gear to be meshed with the driven gear; the hand brake assembly is connected with the shifting fork through a pull rope and used for driving the shifting fork to move, and an elastic reset piece used for driving the shifting fork to reset is further arranged on the installation base. The emergency evacuation function is achieved through mechanical transmission, the airport special vehicle emergency evacuation device has the advantages of being easy and convenient to operate, high in reliability and compact in structure, the evacuation efficiency and safety of airport special vehicles under the emergency condition are remarkably improved, cost is low, and installation is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of airport special vehicles, in particular to an emergency evacuation structure for an airport special vehicle. BACKGROUND

[0002] An airport special vehicle is a special vehicle designed to ensure special tasks such as ground operation of an aircraft, passenger service, cargo handling, and airport maintenance. Airport special vehicles include bulk cargo loaders, passenger boarding stairs, aircraft refueling vehicles, deicing vehicles, etc. They have the characteristics of high specialization and unique functions, and usually need to meet strict aviation safety standards.

[0003] For example, the International Civil Aviation Organization requires full evacuation within 90 seconds. When the aircraft is in emergency evacuation, the cabin door and the slide are the main escape routes. If the bulk cargo loader or the boarding ladder is not evacuated in time, it may block the opening of the cabin door or the unfolding of the slide, delaying the escape time. According to MH / T6030-2024 "Bulk Cargo Loader" and MH / T6029-2014 "Passenger Boarding Stairs", the bulk cargo loader and the passenger boarding stairs should be equipped with at least one set of auxiliary emergency device. When the equipment cannot move normally due to power interruption or hydraulic failure, etc. Emergency, the auxiliary emergency device can manually or automatically trigger the release mechanism to quickly remove the obstacle or provide an auxiliary escape route to ensure the safe evacuation of the personnel on the aircraft.

[0004] At present, there are many types of emergency evacuation structures on the market, covering the design of various mechanical structures. Most of them use hydraulic or mechanical quick release pins to disconnect the connection with the aircraft instantly through manual pull rods or electric control buttons, so that the bulk cargo loader, passenger boarding stairs and other equipment are separated from the aircraft cabin door area. Some also have a gravity self-release system that automatically releases under gravity when power is cut off. Most of the equipment also usually has an emergency reverse function that uses an independent emergency power source to achieve reverse evacuation when the main power fails. These technical means to some extent solve the demand for emergency evacuation, but the emergency evacuation structure in the prior art generally has the problems of complex structure and inconvenient operation, especially in emergency situations, the emergency response speed and reliability of the equipment are difficult to effectively guarantee. At the same time, due to the lack of effective power switching mechanism, some devices may interfere with the main power system when the vehicle is running normally, thereby affecting the overall operation performance. Therefore, how to design an emergency evacuation structure with simple structure, convenient operation and no interference has become a technical problem to be solved. CONTENT OF THE INVENTION

[0005] In order to provide an emergency evacuation structure that meets the requirements of civil aviation and is easy to install, the present application provides an emergency evacuation structure for an airport special vehicle.

[0006] The application provides an emergency evacuation structure for special vehicles in an airport, which adopts the following technical scheme:

[0007] The emergency evacuation structure for special vehicles in an airport comprises a mounting seat, a rotating shaft rotatably arranged on the mounting seat, a driving member for driving the rotating shaft to rotate, and a driven gear connected with a transmission shaft of the special vehicle.

[0008] A driving gear is circumferentially limited and axially slidably connected to the rotating shaft, and one end of the mounting seat is slidably provided with a shift fork, one end of the shift fork is connected with the driving gear and can pull the driving gear to move and engage with the driven gear.

[0009] The emergency evacuation structure further comprises a hand brake assembly connected with the shift fork through a pull rope for driving the shift fork to move, and the mounting seat is further provided with an elastic reset member for driving the shift fork to reset.

[0010] By adopting the above technical scheme, the emergency evacuation structure can realize the quick reverse function of the special vehicle in the airport in an emergency. The structure is simple and convenient to install, and the overall design is compact, which is convenient for installation and maintenance on the special vehicle in the airport. The engagement process of the driving gear and the driven gear in the emergency evacuation structure is stable and reliable, the shift fork is controlled to move through the hand brake assembly, and the accuracy of power transmission is ensured. The design of the elastic reset member enables the driving gear to quickly reset after disengagement, avoiding interference with normal driving of the vehicle. The power system in the application is independent of the main driving system of the vehicle. Even if the vehicle cannot normally drive, the small power source can still drive the hydraulic motor to provide power, realize short distance reverse and complete emergency evacuation.

[0011] Optionally, the shift fork comprises a driving rod, a connecting rod perpendicularly connected to one end of the driving rod, and a first pull rod and a second pull rod fixedly connected to both ends of the connecting rod, respectively. The length direction of the first pull rod and the second pull rod is consistent with the length direction of the driving rod, and the first pull rod and the second pull rod are symmetrically distributed on both sides of the driving rod. The first pull rod and the second pull rod are connected to both sides of the driving gear, respectively. The pull rope of the hand brake assembly is connected to the end of the driving rod.

[0012] By adopting the technical scheme, the structure of the shift fork enables the driving gear to stably and accurately move axially. The vertical connection of the driving rod and the connecting rod and the symmetrical distribution of the first pull rod and the second pull rod ensure the balance of the force, avoiding the shift of the driving gear during the movement or the jamming. The first pull rod and the second pull rod are respectively connected to the two sides of the driving gear, realizing the bidirectional support and force application to the driving gear and improving the stability of the driving gear during the axial sliding. The pull rope of the hand brake assembly is connected to the end of the driving rod, simplifying the operation process. The engagement and disengagement of the driving gear and the driven gear can be conveniently controlled by the hand brake, improving the operation convenience of the emergency evacuation system.

[0013] Optionally, the mounting seat comprises a mounting bracket and a base, the base is fixed to one end of the mounting bracket; the driving rod is slidingly inserted into the base, one end of the driving rod extends out of the base for connecting with the pull rope of the hand brake assembly; strip-shaped holes are formed on both sides of the base, the two strip-shaped holes are symmetrically arranged and are arranged along the length direction of the driving rod, the two ends of the connecting rod extend out of the base through the corresponding strip-shaped holes, and the first pull rod and the second pull rod at the two ends of the connecting rod extend into the mounting bracket and are connected with the driving gear.

[0014] By adopting the technical scheme, the strip-shaped hole can guide and limit the movement of the first pull rod and the second pull rod at the two ends of the connecting rod, enabling the first pull rod and the second pull rod to stably drive the driving gear to move. The design realizes the accurate engagement and disengagement of the driving gear and the driven gear, ensures the reliable operation of the emergency evacuation system, simplifies the structure, and improves the operation convenience.

[0015] Optionally, a ring-shaped connecting groove is formed on the side surface of the driving gear, the ring-shaped connecting groove is recessed towards the center of the driving gear along the radial direction of the driving gear; a first connecting block is fixed to the end of the first pull rod, and a second connecting block is fixed to the end of the second pull rod; one end of the first connecting block and the second connecting block is embedded in the ring-shaped connecting groove.

[0016] By adopting the technical scheme, the connection between the driving gear and the first pull rod and the second pull rod is more stable and reliable. The design of the ring-shaped connecting groove enables the first connecting block and the second connecting block to be accurately embedded and positioned, effectively preventing the axial misalignment of the driving gear during the transmission, thereby improving the overall stability of the emergency evacuation structure. At the same time, the design simplifies the assembly process of the parts, reduces the production cost, and improves the practicality and maintainability of the emergency evacuation system. The arrangement of the ring-shaped connecting groove enhances the force transmission efficiency between the driving gear and the shift fork, ensuring the accurate execution of the gear engagement and disengagement action.

[0017] Optionally, the first connecting block and the second connecting block are provided with a stepped groove at the opposite end, one side of the stepped groove extends into the annular connecting groove, and the other side of the stepped groove abuts against the annular connecting groove.

[0018] By adopting the above technical scheme, the stepped groove provided at the end of the first connecting block and the second connecting block can be more stably embedded into the annular connecting groove of the driving gear, so as to realize limiting and positioning and enhance the stability of the connection. The one side of the stepped groove extends into the annular connecting groove, which effectively prevents the first connecting block and the second connecting block from being radially displaced during the rotation of the driving gear, so as to ensure that the force transmission is more accurate. The other side of the stepped groove abuts against the annular connecting groove, which further limits the axial movement of the first connecting block and the second connecting block, improves the reliability of the overall structure, and thus ensures the smooth operation of the emergency evacuation system during operation.

[0019] Optionally, the elastic reset member is a spring, the spring is sleeved on the driving rod, one end of the spring abuts against the side of the connecting rod, and the other end of the spring abuts against the bottom cover of the base.

[0020] By adopting the above technical scheme, the spring can provide a stable reset force for the fork. When the hand brake is released, the elastic force of the spring pushes the connecting rod and the driving rod to reset, so as to drive the first pull rod and the second pull rod to reset, and finally make the driving gear and the driven gear disengage. This design ensures that the emergency evacuation system quickly returns to the initial state when it is not needed to work, avoids interference with the normal driving of the vehicle, and improves the reliability and operation convenience of the system.

[0021] Optionally, at least two sides of the shaft are symmetrically provided with key grooves, a flat key is installed in the key groove, the length direction of the flat key is consistent with the axial direction of the shaft, the driving gear is sleeved on the shaft and connected with the shaft through the flat key, and the driving gear can reciprocatingly slide along the length direction of the flat key.

[0022] By adopting the above technical scheme, the setting of the flat key enables the driving gear to realize circumferential limiting and axial sliding on the shaft, so as to ensure that the driving gear does not relatively rotate during sliding and can effectively transmit torque. This design not only has a simple structure and is convenient to install, but also can ensure that the engagement and disengagement of the driving gear and the driven gear are more stable and reliable. In addition, the symmetrically provided key grooves further improve the balance of the driving gear during sliding, reduce unnecessary wear, and prolong the service life of the emergency evacuation structure.

[0023] Optionally, the driving member is a hydraulic motor, the driving member is fixed to the other end of the mounting bracket by a fastening bolt, an output shaft of the hydraulic motor is coaxially arranged with the rotating shaft and the two ends are fixedly connected, and the two ends of the rotating shaft are rotatably connected to the mounting bracket by bearings.

[0024] By adopting the above technical scheme, the hydraulic motor as the driving member can provide stable and powerful power output, ensuring that the emergency evacuation structure has sufficient torque to drive the driving gear and the driven gear to engage when rotating at low speed, thereby realizing the emergency evacuation function of the vehicle. The hydraulic motor is coaxially arranged with the rotating shaft and fixed to the mounting bracket by a fastening bolt, making the overall structure more compact and facilitating installation and maintenance. The two ends of the rotating shaft are rotatably connected to the mounting bracket by bearings, effectively reducing friction resistance, improving transmission efficiency and prolonging the service life of the components.

[0025] In summary, the emergency evacuation structure in the present application has at least the following advantages over the prior art:

[0026] 1. In the present application, the emergency evacuation structure moves the shift fork by the hand brake assembly to realize the engagement and disengagement of the driving gear and the driven gear, which is simple and convenient to operate, can quickly respond to emergencies and improve the efficiency of emergency evacuation.

[0027] 2. In the present application, the driving gear and the rotating shaft are connected in the circumferential direction by a key and in the axial direction by a sliding connection, which ensures smooth sliding and accurate engagement of the driving gear at low speed, effectively protects the gear teeth and improves the reliability of gear engagement. The design of double keys not only guides the driving gear, but also balances and stabilizes the transmission of torque while the driving gear slides.

[0028] 3. In the present application, the design of the elastic return member allows the shift fork to automatically reset after the hand brake is released, ensuring that the driving gear and the driven gear are timely separated to avoid interference with normal vehicle driving, while maintaining the independence of the emergency evacuation system and the driving power system.

[0029] 4. In the present application, the optimized design of the shift fork allows the force of the hand brake assembly and the reset elastic member to be evenly distributed to the two symmetrical sides of the rotating shaft, making the overall structure more balanced and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of the emergency evacuation structure in the present application.

[0031] Figure 2 is a schematic diagram of the local half-section structure of the emergency evacuation structure in the present application.

[0032] Figure 3 is a schematic diagram of the three-dimensional structure of the shift fork in the present application.

[0033] Figure 4 This is a schematic diagram of the emergency evacuation structure when the driving gear and driven gear disengage.

[0034] Figure 5 This is a schematic diagram of the structure of the emergency evacuation structure in this application when the driving gear and the driven gear are meshing.

[0035] In the picture:

[0036] 10. Mounting base; 11. Mounting bracket; 12. Base; 121. Strip hole;

[0037] 20. Shaft; 21. Keyway;

[0038] 30. Driving components; 31. Hydraulic motor;

[0039] 40. Driven gear;

[0040] 50. Drive gear; 51. Annular connecting groove;

[0041] 60. Shift fork; 61. Drive rod; 62. Connecting rod; 63. First pull rod; 64. Second pull rod; 65. First connecting block; 66. Second connecting block; 67. Step groove;

[0042] 70. Handbrake assembly; 71. Handle; 72. Pull cord;

[0043] 80. Flexible reset component;

[0044] 90. Flat key;

[0045] 100. Tighten the bolts;

[0046] 110. Bearings. Detailed Implementation

[0047] The following will be combined with the appendix Figure 1 -Appendix Figure 5 The technical solutions in the embodiments of this utility model are clearly and completely described herein. The described embodiments are only possible technical implementations of this utility model and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of this utility model without creative effort, and these embodiments are also within the protection scope of this utility model.

[0048] The connection between the airport special vehicle such as bulk cargo loader, passenger boarding ladder and the aircraft door is either just abutting connection or must be provided with emergency disengaging mechanism, for example, provided with breakable bolt which is automatically broken under emergency tension to make the airport special vehicle disengage from the aircraft. The airport special vehicle also needs to be provided with emergency evacuation structure to ensure that it can completely disengage from the aircraft, and usually requires that after the emergency evacuation structure is released instantaneously through emergency button or manual operation, the disengagement is completed within 10-30 seconds, and the core target is to meet the safety criterion of "90 seconds full evacuation" of civil aviation and reduce the risk of secondary accidents.

[0049] Referring to Figure 1 , Figure 2 and Figure 3 , the emergency evacuation structure provided by the embodiment of the application comprises a hand brake assembly 70, a mounting seat 10, a rotating shaft 20 rotatably arranged on the mounting seat 10, a driving member 30 for driving the rotating shaft 20 to rotate, and a driven gear 40 connected with a transmission shaft of the special vehicle; a driving gear 50 is circumferentially limited and axially slidably connected on the rotating shaft 20, one end of the mounting seat 10 is slidably provided with a shift fork 60, one end of the shift fork 60 is connected with the driving gear 50 and can pull the driving gear 50 to move to engage with the driven gear 40; the emergency evacuation structure further comprises the hand brake assembly 70, the hand brake assembly 70 is connected with the shift fork 60 through a pull rope 72 for driving the shift fork 60 to move, and the mounting seat 10 is further provided with an elastic reset member 80 for driving the shift fork 60 to reset.

[0050] Specifically, the driving member 30 in the application is a hydraulic motor 31, which is provided with a small power source arranged on the airport special vehicle to provide energy source and provide low-speed power for short-distance backward movement of the airport special vehicle; the hand brake assembly 70 comprises a handle 71 hingedly arranged on the airport special vehicle and a pull rope 72 connected with one end of the handle 71, and the handle 71 can drive the pull rope 72 to move through lever structure and principle when it swings. The driven gear 40 is connected with the transmission shaft of the special vehicle, and the hand brake assembly 70 is used to control the engagement and disengagement of the driving gear 50 and the driven gear 40, that is, the connection and disconnection of power, so that the emergency evacuation system of the vehicle is realized. When the main power source of the airport special vehicle fails in an emergency, the handle 71 in the hand brake assembly 70 is pulled, which drives the shift fork 60 to move through the pull rope 72, and then drives the driving gear 50 and the driven gear 40 to engage, so that the hydraulic motor 31 transmits torque to the transmission shaft of the special vehicle through the low-speed rotating rotating shaft 20, thereby driving the special vehicle to move backward by a distance and disengage from the aircraft, realizing emergency evacuation.

[0051] Referring to Figure 2 and Figure 3As shown, the shift fork 60 comprises a driving rod 61, a connecting rod 62 vertically connected to one end of the driving rod 61, and a first pull rod 63 and a second pull rod 64 respectively fixed to two ends of the connecting rod 62, the length directions of the first pull rod 63 and the second pull rod 64 are consistent with the length direction of the driving rod 61, and the first pull rod 63 and the second pull rod 64 are symmetrically distributed on both sides of the driving rod 61; the first pull rod 63 and the second pull rod 64 are respectively connected to both sides of the driving gear 50; the pull rope 72 of the hand brake assembly 70 is connected to the end of the driving rod 61.

[0052] Further, referring to Figure 1 and Figure 2 As shown, the mounting seat 10 comprises a mounting bracket 11 and a base 12, the base 12 is fixed to one end of the mounting bracket 11; the driving member 30 is fixed to the other end of the mounting bracket 11 through a fastening bolt 100, the output shaft of the hydraulic motor 31 is coaxially arranged with the rotating shaft 20 and the two ends are fixedly connected, both ends of the rotating shaft 20 are rotatably connected with the mounting bracket 11 through bearings 110. The driving rod 61 is slidingly inserted into the base 12, one end of the driving rod 61 extends out of the base 12 for connecting with the pull rope 72 of the hand brake assembly 70; both sides of the base 12 are provided with strip-shaped holes 121, the two strip-shaped holes 121 are symmetrically arranged and are arranged along the length direction of the driving rod 61, both ends of the connecting rod 62 extend out of the base 12 through the corresponding strip-shaped holes 121, the first pull rod 63 and the second pull rod 64 located at both ends of the connecting rod 62 extend into the mounting bracket 11 and are connected with the driving gear 50; the strip-shaped holes 121 can play a guiding and limiting role, so that the first pull rod 63 and the second pull rod 64 at both ends of the connecting rod 62 can smoothly drive the driving gear 50 to move.

[0053] Referring to Figure 3As shown, the side surface of the driving gear 50 is provided with an annular connecting groove 51 recessed along the radial direction of the driving gear 50 to the center of the driving gear 50; the end of the first pull rod 63 is fixedly provided with a first connecting block 65, and the end of the second pull rod 64 is fixedly provided with a second connecting block 66; one end of the first connecting block 65 and the second connecting block 66 is embedded in the annular connecting groove 51. Further, the opposite end of the first connecting block 65 and the second connecting block 66 is provided with a stepped groove 67, one side groove wall of the stepped groove 67 extends into the annular connecting groove 51, and the other side groove wall of the stepped groove 67 abuts against the annular connecting groove 51 of the driving gear 50. In this way, the connection between the driving gear 50 and the first pull rod 63 and the second pull rod 64 is more stable and reliable. The design of the annular connecting groove 51 enables the first connecting block 65 and the second connecting block 66 to be accurately embedded and positioned, effectively preventing the driving gear 50 from being axially misaligned during transmission, thereby improving the overall stability of the emergency evacuation structure. At the same time, this design simplifies the assembly process of the parts, reduces the production cost, and improves the practicality and maintainability of the emergency evacuation system, thereby ensuring the smooth operation of the emergency evacuation system during operation.

[0054] Referring to Figure 3 , Figure 4 and Figure 5 , the elastic return member 80 is a spring, which is sleeved on the driving rod 61, one end of the spring abuts against the side surface of the connecting rod 62, and the other end of the spring abuts against the bottom cover of the base 12; the spring can provide a stable return force for the fork 60. When the hand brake is released, the elastic force of the spring pushes the connecting rod 62 and the driving rod 61 to reset, thereby driving the first pull rod 63 and the second pull rod 64 to reset, and finally making the driving gear 50 disengage with the driven gear 40. This design ensures that the emergency evacuation system quickly returns to the initial state when it is not needed, avoids interference with the normal driving of the vehicle, and improves the reliability and operation convenience of the system.

[0055] Referring to Figure 3As shown, at least two sides of the rotating shaft 20 in the application are symmetrically provided with key grooves 21, and a flat key 90 is installed in the key groove 21. The length direction of the flat key 90 is consistent with the axial direction of the rotating shaft 20. The driving gear 50 is sleeved on the rotating shaft 20 and connected with the rotating shaft 20 through the flat key 90. The driving gear 50 can reciprocate along the length direction of the flat key 90. The flat key 90 can limit the circumferential direction of the driving gear 50 on the rotating shaft 20 and slide in the axial direction, so as to ensure that the driving gear 50 does not rotate relatively during the sliding process, and the torque can be effectively transmitted. The design not only has a simple structure and is convenient to install, but also can ensure that the meshing and disengaging actions of the driving gear 50 and the driven gear 40 are more stable and reliable. In addition, the symmetrically provided key grooves 21 further improve the balance of the driving gear 50 during the sliding process, reduce unnecessary wear, and prolong the service life of the emergency evacuation structure.

[0056] The implementation principle of the embodiment is that the hydraulic motor 31 as the driving piece 30 can provide stable and powerful power output, so as to ensure that the emergency evacuation structure has enough torque to drive the driving gear 50 and the driven gear 40 to mesh when rotating at a low speed, so as to realize the emergency evacuation function of the vehicle. The hydraulic motor 31 is coaxially arranged with the rotating shaft 20 and fixed on the mounting bracket 11 through the fastening bolt 100, so that the overall structure is more compact, and the installation and maintenance are more convenient. The two ends of the rotating shaft 20 are rotationally connected with the mounting bracket 11 through the bearing 110, so as to effectively reduce the friction resistance, improve the transmission efficiency, and prolong the service life of the components.

[0057] The emergency evacuation structure in the application can realize the rapid backward function of the airport special vehicle in an emergency. The structure is simple and convenient to install, the overall design is compact, and the installation and maintenance on the airport special vehicle are convenient. The meshing process of the driving gear 50 and the driven gear 40 in the emergency evacuation structure in the application is stable and reliable. The movement of the fork 60 is controlled through the hand brake assembly 70, so as to ensure the accuracy of power transmission. The design of the elastic reset member 80 enables the driving gear 50 to quickly reset after disengaging, so as to avoid interference with the normal driving of the vehicle. The power system in the application is independent of the main driving system of the vehicle. Even if the vehicle cannot normally drive, the hydraulic motor 31 can still be driven by a small power source to provide power, so as to realize short-distance backward movement to complete the emergency evacuation.

[0058] The structure of the fork 60 enables the driving gear 50 to move axially stably and accurately. The vertical connection of the driving rod 61 and the connecting rod 62 and the symmetrical distribution of the first pull rod 63 and the second pull rod 64 ensure the balance of the force, avoiding the deviation or jamming of the driving gear 50 during the movement. The first pull rod 63 and the second pull rod 64 are connected to the two sides of the driving gear 50 respectively, realizing the bidirectional support and force application to the driving gear 50 and improving the stability of the driving gear 50 during the axial sliding. The pull rope 72 of the hand brake assembly 70 is connected to the end of the driving rod 61, simplifying the operation process and enabling the engagement and disengagement of the driving gear 50 and the driven gear 40 to be conveniently controlled through the hand brake, thereby improving the operation convenience of the emergency evacuation system.

[0059] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, wherein the same parts are denoted by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An emergency evacuation structure for use on special vehicles at airports, characterized in that, The emergency evacuation structure includes a mounting base (10), a rotating shaft (20) rotatably mounted on the mounting base (10), a driving component (30) for driving the rotating shaft (20) to rotate, and a driven gear (40) connected to the transmission shaft of a special vehicle. The rotating shaft (20) is circumferentially limited and axially slidably connected to a drive gear (50). One end of the mounting base (10) is slidably provided with a fork (60). One end of the fork (60) is connected to the drive gear (50) and can pull the drive gear (50) to move and then mesh with the driven gear (40). The emergency evacuation structure also includes a handbrake assembly (70), which is connected to the shift fork (60) via a pull rope (72) to drive the shift fork (60) to move. The mounting base (10) is also provided with an elastic reset member (80) for driving the shift fork (60) to reset.

2. The emergency evacuation structure for airport special vehicles according to claim 1, characterized in that, The shift fork (60) includes a drive rod (61), a connecting rod (62) vertically connected to one end of the drive rod (61), and a first pull rod (63) and a second pull rod (64) respectively fixed to both ends of the connecting rod (62). The length directions of the first pull rod (63) and the second pull rod (64) are consistent with the length direction of the drive rod (61), and the first pull rod (63) and the second pull rod (64) are symmetrically distributed on both sides of the drive rod (61). The first pull rod (63) and the second pull rod (64) are respectively connected to both sides of the drive gear (50). The pull rope (72) of the handbrake assembly (70) is connected to the end of the drive rod (61).

3. The emergency evacuation structure for airport special vehicles according to claim 2, characterized in that, The mounting base (10) includes a mounting bracket (11) and a base (12). The base (12) is fixed to one end of the mounting bracket (11). The drive rod (61) is slidably inserted into the base (12). One end of the drive rod (61) extends out of the base (12) to connect with the pull rope (72) of the handbrake assembly (70). The base (12) has strip holes (121) on both sides. The two strip holes (121) are symmetrically arranged and are both arranged along the length direction of the drive rod (61). The two ends of the connecting rod (62) pass through the corresponding strip holes (121) and extend out of the base (12). The first pull rod (63) and the second pull rod (64) located at both ends of the connecting rod (62) extend into the mounting bracket (11) and connect with the drive gear (50).

4. The emergency evacuation structure for airport special vehicles according to claim 3, characterized in that, An annular connecting groove (51) is provided on the side of the drive gear (50), and the annular connecting groove (51) is recessed towards the center of the drive gear (50) along the radial direction of the drive gear (50); a first connecting block (65) is fixedly provided at the end of the first pull rod (63), and a second connecting block (66) is fixedly provided at the end of the second pull rod (64); one end of the first connecting block (65) and the second connecting block (66) is embedded in the annular connecting groove (51).

5. The emergency evacuation structure for airport special vehicles according to claim 4, characterized in that, The first connecting block (65) and the second connecting block (66) are provided with stepped grooves (67) at their opposite ends. One side of the stepped groove (67) extends into the annular connecting groove (51), and the other side of the stepped groove (67) abuts against the opening of the annular connecting groove (51) of the drive gear (50).

6. The emergency evacuation structure for airport special vehicles according to claim 3, 4, or 5, characterized in that, The elastic reset element (80) is a spring, which is sleeved on the drive rod (61). One end of the spring abuts against the side of the connecting rod (62), and the other end of the spring abuts against the bottom cover of the base (12).

7. The emergency evacuation structure for airport special vehicles according to any one of claims 1 to 5, characterized in that, The rotating shaft (20) has keyways (21) symmetrically formed on at least two sides. A flat key (90) is installed in the keyway (21). The length direction of the flat key (90) is consistent with the axial direction of the rotating shaft (20). The drive gear (50) is sleeved on the rotating shaft (20) and connected to the rotating shaft (20) through the flat key (90). The drive gear (50) can slide back and forth along the length direction of the flat key (90).

8. The emergency evacuation structure for airport special vehicles according to claim 3, 4, or 5, characterized in that, The driving component (30) is a hydraulic motor (31). The driving component (30) is fixedly connected to the other end of the mounting bracket (11) by fastening bolts (100). The output shaft of the hydraulic motor (31) is coaxially arranged with the rotating shaft (20) and the ends of the two are fixedly connected. Both ends of the rotating shaft (20) are rotatably connected to the mounting bracket (11) through bearings (110).

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