Gallery bridge for front side cabin door of airplane
Through the design of the bridge with lifting and telescopic structures, the problem of the difference in the size of the cabin doors of different models is solved, rapid adaptation and flexible transportation are achieved, and universality and position adjustment efficiency are improved.
Patent Information
- Application Number
- CN202422202223.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The existing bridges cannot adapt to the differences in the size of the doors of different aircraft models, resulting in insufficient flexibility and versatility when transporting components.
A bridge connecting the platform and the hatch platform is designed. Through the lifting and telescopic structure, combined with the telescopic drive motor, the lifting jack and the flexible connection, the adaptive adjustment of the different aircraft cabin doors is achieved.
It realizes rapid adjustment of the bridge to adapt to different models within 10 minutes, improves transportation flexibility and versatility, and facilitates location transfer and maintenance.
Smart Images
Figure CN223148707U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of aircraft maintenance and repair auxiliary equipment, and particularly relates to a boarding bridge for the front side cabin door of an aircraft. Background Art
[0002] During the internal maintenance and repair of an aircraft, it is necessary to transport the internal components of the aircraft (such as kitchens, toilets, seats, etc.) out from the positions of the No. 1 cabin door and the No. 2 cabin door on the front side. After the maintenance and repair are completed, these components need to be transported back. Usually, these components are transported on small trolleys. Since the cabin doors of the aircraft have a certain height, these operations need to be carried out on a boarding bridge. And because the overall dimensions of different models of aircraft, as well as the dimensions of the No. 1 cabin door and the No. 2 cabin door, are different, it is necessary to design a boarding bridge structure with strong versatility and high flexibility. Summary of the Utility Model
[0003] In order to solve the above technical problems, the utility model provides a boarding bridge for the front side cabin door of an aircraft, which mainly increases versatility through lifting and telescoping.
[0004] The utility model is realized as follows: a boarding bridge for the front side cabin door of an aircraft is provided, which includes a connecting platform and a cabin door platform. The connecting platform includes a connecting fixed platform and a first connecting telescoping platform and a second connecting telescoping platform arranged on the left and right sides of the connecting fixed platform. The cabin door platform includes a cabin door fixed platform and a first cabin door telescoping platform and a second cabin door telescoping platform arranged on the left and right sides of the cabin door fixed platform. One side of the first connecting telescoping platform far away from the connecting fixed platform is slidably connected to the transportation fixed platform in the front-back direction. One side of the second connecting telescoping platform far away from the connecting fixed platform is connected to the first cabin door telescoping platform. At the lower end of the connecting fixed platform near the second connecting telescoping platform side, a first lifting column structure is provided. At the lower ends of the left and right sides of the cabin door fixed platform, a second lifting column structure and a third lifting column structure are respectively provided.
[0005] Preferably, telescoping tracks are arranged in the front-back direction inside the main frames of the connecting fixed platform and the cabin door fixed platform. The first connecting telescoping platform, the second connecting telescoping platform, the first cabin door telescoping platform, and the second cabin door telescoping platform all include telescoping frames and a number of small lifting platforms arranged on the telescoping frames. The front and back sides of the telescoping frames of each telescoping platform are respectively connected to the corresponding telescoping tracks through compound guide wheels, and the telescoping frames are driven to slide along the telescoping tracks through a telescoping drive structure. Each small lifting platform includes a lifting drive structure and a small lifting platform plate arranged above the lifting drive structure.
[0006] Further preferably, the telescopic drive structure includes a telescopic drive motor, a telescopic gear, and a telescopic rack. The telescopic drive motor is arranged on the lower sides of the left and right ends of the connection and fixing platform and the hatch fixing platform. The telescopic gear is connected to the output end of the telescopic drive motor. The telescopic racks are respectively connected to the first connecting telescopic platform, the second connecting telescopic platform, the first hatch telescopic platform, and the second hatch telescopic platform. The telescopic gears at the corresponding positions are meshed with the telescopic racks;
[0007] The lifting drive structure includes a lifting drive motor, a lifting transmission structure, and four jacks. The lifting drive motor is connected to the four jacks through the lifting transmission structure. The small lifting platform plate is connected above the four jacks. A guide post is provided on the telescopic frame beside each of the four jacks. A guide angle steel is provided at the position corresponding to the guide post on the lower surface of the small lifting platform plate. The guide angle steel is slidably attached to an edge of the guide post.
[0008] Further preferably, a displacement track is provided on the transportation and fixing platform. Two displacement wheel structures are slidably connected to the displacement track. The displacement wheel structure includes a displacement wheel, a displacement frame, and a displacement motor. The displacement wheel is installed inside the displacement frame. The displacement wheel is matched in the displacement track. The displacement motor is installed outside the displacement frame to drive the displacement wheel to roll in the displacement track. At the top of the displacement frame, a U-shaped groove is provided. Two connecting pins are respectively provided on the front and rear sides of the first connecting telescopic platform. The two connecting pins are placed in the U-shaped grooves of the two displacement wheel structures. A protection pin passes through the connecting pins and is detachably connected to the U-shaped grooves at both ends;
[0009] A fourth lifting column structure is provided on the lower side of the first connecting telescopic platform close to the transportation and fixing platform. A hand-cranked lifting leg is provided at the lower end of the fourth lifting column structure.
[0010] Further preferably, the first lifting column structure, the second lifting column structure, and the third lifting column structure all include a support column, a lifting column, and a column lifting drive structure provided on the lifting column. The column lifting drive structure includes a column lifting motor, a column lifting lead screw, a load-bearing nut, and a safety nut. The support column is sleeved inside the lifting column. The column lifting motor is connected to the column lifting lead screw through a transmission structure. The column lifting lead screw is placed inside the lifting column. The load-bearing nut and the safety nut are arranged on the column lifting lead screw. Both the load-bearing nut and the safety nut are fixedly connected to the support column. The lower end of the load-bearing nut and the upper end of the safety nut are tooth-shaped structures that mesh with each other. And there is a certain gap between the tooth-shaped structure at the lower end of the load-bearing nut and the tooth-shaped structure at the upper end of the safety nut. An observation window is provided on the lifting column corresponding to the meshing position of the load-bearing nut and the safety nut.
[0011] Further preferably, two steering wheels and two universal wheels are provided below the support column of the first lifting column structure; one steering wheel and one universal wheel are provided below the support columns of the second lifting column structure and the third lifting column structure.
[0012] Further preferably, the second connecting telescopic platform and the first hatch telescopic platform are connected by a flexible connection structure. The flexible connection structure includes a convex mounting seat provided on the second connecting telescopic platform and a concave mounting seat provided on the first hatch telescopic platform. The convex mounting seat is inserted into the concave mounting seat. An articulated bearing is provided in the convex mounting seat. A quick-release pin passes through the articulated bearing of the convex mounting seat and the concave mounting seat. The hole through which the quick-release pin passes on the concave mounting seat is an elongated hole, and there is a certain gap between the convex mounting seat and the concave mounting seat.
[0013] Further preferably, fixed guardrails are provided on both the front and rear sides of the connection fixed platform and the hatch fixed platform. The left and right sides of each fixed guardrail on the connection fixed platform and the left and right sides of the fixed guardrail on the hatch fixed platform away from the aircraft are slidably connected to transverse telescopic guardrails. Each transverse telescopic guardrail is connected to the first connecting telescopic platform, the second connecting telescopic platform, the first hatch telescopic platform, and the second hatch telescopic platform at the corresponding positions. The extension and retraction of the first connecting telescopic platform, the second connecting telescopic platform, the first hatch telescopic platform, and the second hatch telescopic platform drive the extension and retraction of the respective transverse telescopic guardrails.
[0014] Further preferably, pull-out plates are provided on the sides of the hatch fixed platform, the first hatch telescopic platform, and the second hatch telescopic platform close to the aircraft.
[0015] Further preferably, a longitudinal telescopic guardrail is provided on the side close to the aircraft at the docking position of the second connecting telescopic platform and the first hatch telescopic platform.
[0016] Compared with the prior art, the advantages of the present utility model are as follows:
[0017] The present utility model provides a boarding bridge for the front side hatch of an aircraft. Through the arrangement of each telescopic platform, it can be telescoped horizontally, enabling the boarding bridge to adapt to the distance between the No. 1 hatch and the No. 2 hatch of different aircraft; through the arrangement of each lifting column structure, it can be lifted vertically, enabling the boarding bridge to adapt to the heights of the No. 1 hatch and the No. 2 hatch of different aircraft. At the same time, the boarding bridge provided by the present utility model can achieve quick disassembly from the connection fixed platform, and single-point flexible connection between the connection platform and the hatch platform, facilitating the transfer or maintenance of the boarding bridge position. Cooperating with the automation system, it can be adjusted from the adaptation position of one aircraft type to the adaptation position of another aircraft type within 10 minutes. Description of the Drawings
[0018] Figure 1 The overall structure diagram of the air bridge for the front side door of the aircraft provided by the present utility model;
[0019] Figure 2 It is the structure diagram of the connecting platform;
[0020] Figure 3 It is the structure diagram of the connecting platform from another angle;
[0021] Figure 4 It is the structure diagram of the second connecting telescopic platform;
[0022] Figure 5 It is the structure diagram of the first hatch telescopic platform;
[0023] Figure 6 It is the structure diagram of a small lifting platform on the first hatch telescopic platform from a bottom-up view;
[0024] Figure 7 It is the structure diagram of the connection position between the connecting platform and the transportation fixed platform;
[0025] Figure 8 It is for Figure 7 The enlarged view of position A in
[0026] Figure 9 It is the structure diagram of the hatch platform from a bottom-up view at the end far from the connecting platform;
[0027] Figure 10 It is the connection structure diagram of the column lifting screw rod, load-bearing nut and safety nut;
[0028] Figure 11 It is the schematic diagram of the flexible connection structure;
[0029] Figure 12 It is the schematic diagram of the flexible connection structure from another angle;
[0030] Figure 13 It is the internal view of the flexible connection structure;
[0031] Figure 14 It is the three-dimensional structure diagram of the longitudinal telescopic guardrail. Specific embodiments
[0032] To make the purpose, technical solutions and advantages of the utility model clearer, the following will describe the technical solutions in the utility model in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the utility model.
[0033] Refer to Figures 1-14, the present utility model provides a gangway for the front side door of an aircraft, which includes a connection platform and a door platform. The connection platform includes a connection fixed platform 1, a first connection telescopic platform 2 and a second connection telescopic platform 3 arranged on the left and right sides of the connection fixed platform 1. The door platform includes a door fixed platform 4, a first door telescopic platform 5 and a second door telescopic platform 6 arranged on the left and right sides of the door fixed platform 4. One side of the first connection telescopic platform 2 away from the connection fixed platform 1 is slidably connected to the transportation fixed platform in the front and back direction. One side of the second connection telescopic platform 3 away from the connection fixed platform 1 is connected to the first door telescopic platform 5. At the lower end of the connection fixed platform 1 near the second connection telescopic platform 3, a first lifting column structure 8 is provided. At the lower ends of the left and right sides of the door fixed platform 4, a second lifting column structure 9 and a third lifting column structure 10 are respectively provided.
[0034] Generally, the transportation fixed platform is a cement platform. When using the gangway provided by the present utility model to repair or maintain an aircraft, the first connection telescopic platform 2 is slidably connected to the cement platform in the front and back direction. According to the height of the target aircraft and the positions of the No. 1 door and the No. 2 door, the telescopic positions of the first connection telescopic platform 2, the second connection telescopic platform 3, the first door telescopic platform 5 and the second door telescopic platform 6 are controlled by the control system, and the heights of the first lifting column structure 8, the second lifting column structure 9 and the third lifting column structure 10 are controlled, so that the gangway adapts to the target aircraft in the horizontal and vertical directions. After adjustment, repair or component transportation can be carried out.
[0035] In order to facilitate the telescoping of each telescopic platform from the two fixed platforms and to facilitate the upper surfaces of each telescopic platform and the fixed platform to be flush, as an improvement of the technical solution, telescopic tracks 11 are provided before and after inside the main frames of the connection fixed platform 1 and the door fixed platform 4. The first connection telescopic platform 2, the second connection telescopic platform 3, the first door telescopic platform 5 and the second door telescopic platform 6 each include a telescopic frame 12 and a plurality of small lifting platforms 13 arranged on the telescopic frame 12. The front and back sides of the telescopic frame 12 of each telescopic platform are respectively connected to the corresponding telescopic track 11 through compound guide wheels 17, and the telescopic frame 12 is driven to slide along the telescopic track 11 by a telescopic drive structure. Each small lifting platform 13 includes a lifting drive structure and a small lifting platform board 14 arranged above the lifting drive structure.
[0036] When it is necessary to extend the telescopic platform from the fixed platform, the telescopic drive structure works, driving the telescopic frame 12 to slide outwards along the telescopic track 11, extending out of the main frame of the fixed platform. Then the lifting drive structure works, driving the small lifting platform board 14 to rise until the upper surface of the small lifting platform board 14 is flush with the upper surface of the fixed platform.
[0037] As a specific implementation of the telescopic drive structure and the lifting drive structure, the telescopic drive structure includes a telescopic drive motor 20, a telescopic gear, and a telescopic rack 22. The telescopic drive motor 20 is arranged on the lower sides of the left and right ends of the connection and fixing platform 1 and the hatch fixing platform 4. A telescopic gear is connected to the output end of the telescopic drive motor 20, and the telescopic racks 22 are respectively connected to the first connection and telescopic platform 2, the second connection and telescopic platform 3, the first hatch telescopic platform 5, and the second hatch telescopic platform 6. The telescopic gears at the corresponding positions mesh with the telescopic racks 22;
[0038] During the working process, the telescopic drive motor 20 operates to drive the telescopic gear to rotate. The telescopic gear drives the telescopic rack 22 to translate, and the telescopic rack 22 drives each telescopic platform to translate for telescoping;
[0039] The lifting drive structure includes a lifting drive motor 15, a lifting transmission structure, and four jacks 16. The lifting drive motor 15 is connected to the four jacks 16 through the lifting transmission structure. The small lifting platform plate 14 is connected above the four jacks 16. A guiding column 18 is provided on the telescopic frame 12 beside each of the four jacks 16. A guiding angle steel 19 is provided at the position corresponding to the guiding column 18 on the lower surface of the small lifting platform plate 14. The guiding angle steel 19 is slidably attached to an edge of the guiding column 18.
[0040] During the working process, the lifting drive motor 15 operates to control the four jacks 16 to rise through the lifting transmission structure, and is guided by the guiding column 18 and the guiding angle steel 19 until the upper surface of the small lifting platform plate 14 is flush with the upper surface of the fixed platform.
[0041] As a specific connection method between the transportation and fixing platform and the first connection and telescopic platform 2, and for the convenience of realizing quick disassembly between the two, as an improvement of the technical solution, a shifting track 23 is provided on the transportation and fixing platform. Two shifting wheel structures 24 are slidably connected to the shifting track 23. The shifting wheel structure 24 includes a shifting wheel 25, a shifting frame 26, and a shifting motor 27. The shifting wheel 25 is installed inside the shifting frame 26. The shifting wheel 25 is matched in the shifting track 23. The shifting motor 27 is installed outside the shifting frame 26 to drive the shifting wheel 25 to roll in the shifting track 23. At the top of the shifting frame 26, a U-shaped groove 28 is provided. Two connection pins 29 are respectively provided on the front and rear sides of the first connection and telescopic platform 2. The two connection pins 29 are placed in the U-shaped grooves 28 of the two shifting wheel structures 24. A protection pin 30 passes through the connection pins 29 and is detachably connected to the U-shaped grooves 28 at both ends;
[0042] A fourth lifting column structure 31 is provided on the lower side of the first connection and telescopic platform 2 close to the transportation and fixing platform. A hand-cranked lifting leg 32 is provided at the lower end of the fourth lifting column structure 31.
[0043] When the corridor bridge needs to be closer to the aircraft, on the side of the first connected telescopic platform 2, the shift motor 27 works to drive the shift wheel 25 to roll on the shift track 23, driving the shift frame 26 to move on the shift track 23, thereby driving the first connected telescopic platform 2 to approach the aircraft. When the corridor bridge needs to be moved as a whole, the protection pin 30 is pulled out, and the height of the hand-cranked lifting leg 32 is raised through manual operation. During the raising process, the first connected telescopic platform 2 is lifted up, so that the two connecting pins 29 are disengaged from the U-shaped groove 28, and the corridor bridge can be moved.
[0044] As a specific arrangement of each lifting column structure, the first lifting column structure 8, the second lifting column structure 9 and the third lifting column structure 10 all include a support column 33, a lifting column 34 and a column lifting drive structure arranged on the lifting column 34, the column lifting drive structure includes a column lifting motor 35, a column lifting screw rod 36, a bearing nut 37 and a safety nut 38, the support column 33 is sleeved inside the lifting column 34, and the column lifting motor 35 is connected to the column lifting screw rod through a transmission structure 36, the column lifting screw rod 36 is placed in the lifting column 34, and a bearing nut 37 and a safety nut 38 are arranged on the column lifting screw rod 36. The bearing nut 37 and the safety nut 38 are fixedly connected to the support column 33. The lower end of the bearing nut 37 and the upper end of the safety nut 38 are toothed structures meshing with each other, and there is a certain gap between the toothed structure at the lower end of the bearing nut 37 and the toothed structure at the upper end of the safety nut 38. An observation window is provided on the lifting column 34 corresponding to the meshing position of the bearing nut 37 and the safety nut 38.
[0045] During the lifting process, the column lifting motor 35 works and drives the two column lifting screw rods 36 to rotate through the transmission structure. During the rotation of the column lifting screw rod 36, since the load-bearing nut 37 and the safety nut 38 do not rotate, the column lifting screw rod 36 drives the lifting column 34 to rise and fall. When the load-bearing nut 37 is worn, the gap between the load-bearing nut 37 and the safety nut 38 will decrease. When the load-bearing nut 37 is excessively worn, the safety nut 38 will support the load-bearing nut 37 to prevent it from falling. The change in the gap size can be observed through the observation window.
[0046] In order to facilitate the movement of the connecting platform and the hatch platform, as an improvement of the technical solution, two steering wheels 41 and two universal wheels 42 are provided below the support column 33 of the first lifting column structure 8; a steering wheel 41 and a universal wheel 42 are provided below the support column 33 of the second lifting column structure 9 and the third lifting column structure 10. The moving direction of the platform is limited by the steering wheel 41.
[0047] In order to facilitate the movement process and prevent the connection platform and the hatch platform from having significant interference and hindering the completion of the movement, as an improvement to the technical solution, the second connecting telescopic platform 3 and the first hatch telescopic platform 5 are connected by a flexible connection structure 7. The flexible connection structure 7 includes a convex mounting seat 21 provided on the second connecting telescopic platform 3 and a concave mounting seat 45 provided on the first hatch telescopic platform 5. The convex mounting seat 21 is inserted into the concave mounting seat 45. A spherical plain bearing 47 is provided in the convex mounting seat 21. A quick-release pin 46 passes through the spherical plain bearing 47 of the convex mounting seat 21 and the concave mounting seat 45. The hole on the concave mounting seat 45 through which the quick-release pin 46 passes is an oblong hole, and there is a certain gap between the convex mounting seat 21 and the concave mounting seat 45.
[0048] Since there is an angle between the connection platform and the hatch platform, when the connection platform and the hatch platform move or lift, there will be changes in angle and displacement between them. In order to avoid jamming at the connection point, the flexible connection structure 7 is specially designed. The flexible connection structure 7 is equipped with a spherical plain bearing 47 and can rotate at any angle (the rotation angle is not more than 5 degrees). Through the design of the oblong hole and the gap between the convex mounting seat 21 and the concave mounting seat 45, the quick-release pin 46 has appropriate gaps in both the horizontal and vertical directions, enabling slight crosstalk in the horizontal and vertical directions. In addition, when the platform lifts, the control system will control the platform to move forward and backward simultaneously. Combining multiple measures ensures the smooth movement and lifting of the platform.
[0049] In order to protect the construction personnel and to cooperate with each telescopic platform, as an improvement to the technical solution, fixed guardrails 39 are provided on both the front and rear sides of the connection fixed platform 1 and the hatch fixed platform 4. The left and right sides of each fixed guardrail 39 on the connection fixed platform 1 and the left and right sides of the fixed guardrail 39 on the hatch fixed platform 4 away from the aircraft are slidably connected to a transverse telescopic guardrail 40. Each transverse telescopic guardrail 40 is connected to the first connecting telescopic platform 2, the second connecting telescopic platform 3, the first hatch telescopic platform 5, and the second hatch telescopic platform 6 at the corresponding positions. The extension and retraction of the first connecting telescopic platform 2, the second connecting telescopic platform 3, the first hatch telescopic platform 5, and the second hatch telescopic platform 6 drive the extension and retraction of each transverse telescopic guardrail 40.
[0050] In order to further adjust the distance between the air bridge and the aircraft, as an improvement to the technical solution, pull-out plates 43 are provided on the sides of the hatch fixed platform 4, the first hatch telescopic platform 5, and the second hatch telescopic platform 6 close to the aircraft.
[0051] In order to provide comprehensive protection for construction workers and increase the safety of the corridor bridge, as an improvement, a longitudinal telescopic guardrail 44 is provided on the side close to the aircraft where the second connecting telescopic platform 3 and the first cabin door telescopic platform 5 are connected. The longitudinal telescopic guardrail 44 is a hand-cranked drive structure.
Claims
1. An air bridge for the front side door of an aircraft, characterized in that, It includes a connection platform and a hatch platform. The connection platform includes a connection fixed platform (1), a first connection telescopic platform (2) and a second connection telescopic platform (3) arranged on the left and right sides of the connection fixed platform (1). The hatch platform includes a hatch fixed platform (4), a first hatch telescopic platform (5) and a second hatch telescopic platform (6) arranged on the left and right sides of the hatch fixed platform (4). One side of the first connection telescopic platform (2) far from the connection fixed platform (1) is slidably connected to the transportation fixed platform in the front-back direction. One side of the second connection telescopic platform (3) far from the connection fixed platform (1) is connected to the first hatch telescopic platform (5). At the lower end of one side of the connection fixed platform (1) close to the second connection telescopic platform (3), a first lifting column structure (8) is provided. At the lower ends of the left and right sides of the hatch fixed platform (4), a second lifting column structure (9) and a third lifting column structure (10) are respectively provided.
2. The jet bridge for the front side door of an aircraft according to claim 1, characterized in that, Inside the main frames of the connection fixed platform (1) and the hatch fixed platform (4), telescopic tracks (11) are provided in the front-back direction. The first connection telescopic platform (2), the second connection telescopic platform (3), the first hatch telescopic platform (5) and the second hatch telescopic platform (6) all include telescopic frames (12) and a number of small lifting platforms (13) arranged on the telescopic frames (12). The front and back sides of the telescopic frames (12) of each telescopic platform are respectively connected to the corresponding telescopic tracks (11) through compound guide wheels (17). The telescopic frames (12) are driven to slide along the telescopic tracks (11) by a telescopic drive structure. Each small lifting platform (13) includes a lifting drive structure and a small lifting platform plate (14) arranged above the lifting drive structure.
3. The jet bridge for the front side door of the aircraft according to claim 2, characterized in that, The telescopic drive structure includes a telescopic drive motor (20), a telescopic gear and a telescopic rack (22). The telescopic drive motor (20) is arranged on the lower sides of the left and right ends of the connection fixed platform (1) and the hatch fixed platform (4). A telescopic gear is connected to the output end of the telescopic drive motor (20). The telescopic racks (22) are respectively connected to the first connection telescopic platform (2), the second connection telescopic platform (3), the first hatch telescopic platform (5) and the second hatch telescopic platform (6). The telescopic gears at the corresponding positions are meshed with the telescopic racks (22). The lifting drive structure includes a lifting drive motor (15), a lifting transmission structure and four jacks (16). The lifting drive motor (15) is connected to the four jacks (16) through the lifting transmission structure. The small lifting platform plate (14) is connected above the four jacks (16). A guide post (18) is provided on the telescopic frame (12) beside each of the four jacks (16). A guide angle steel (19) is provided at a position corresponding to the guide post (18) on the lower surface of the small lifting platform plate (14). The guide angle steel (19) slides and fits on an edge of the guide post (18).
4. The jet bridge for the front side door of an aircraft according to claim 1, characterized in that, A shifting track (23) is provided on the transportation fixed platform. Two shifting wheel structures (24) are slidably connected to the shifting track (23). The shifting wheel structure (24) includes a shifting wheel (25), a shifting frame (26) and a shifting motor (27). The shifting wheel (25) is installed inside the shifting frame (26). The shifting wheel (25) is matched inside the shifting track (23). The shifting motor (27) is installed outside the shifting frame (26) to drive the shifting wheel (25) to roll inside the shifting track (23). At the top of the shifting frame (26), a U-shaped groove (28) is provided. On the front and rear sides of the first connecting telescopic platform (2), two connecting pins (29) are respectively provided. The two connecting pins (29) are placed in the U-shaped grooves (28) of the two shifting wheel structures (24). A protection pin (30) passes through the connecting pin (29) and is detachably connected to the U-shaped groove (28) at both ends; A fourth lifting column structure (31) is provided on the lower side of the first connecting telescopic platform (2) close to the transportation fixed platform. A hand-cranked lifting leg (32) is provided at the lower end of the fourth lifting column structure (31).
5. The jet bridge for the front side door of an aircraft according to claim 1, characterized in that, The first lifting column structure (8), the second lifting column structure (9) and the third lifting column structure (10) all include a support column (33), a lifting column (34) and a column lifting drive structure provided on the lifting column (34). The column lifting drive structure includes a column lifting motor (35), a column lifting lead screw (36), a load-bearing nut (37) and a safety nut (38). The support column (33) is sleeved inside the lifting column (34). The column lifting motor (35) is connected to the column lifting lead screw (36) through a transmission structure. The column lifting lead screw (36) is placed inside the lifting column (34). A load-bearing nut (37) and a safety nut (38) are arranged on the column lifting lead screw (36). Both the load-bearing nut (37) and the safety nut (38) are fixedly connected to the support column (33). The lower end of the load-bearing nut (37) and the upper end of the safety nut (38) are tooth-shaped structures that mesh with each other, and there is a certain gap between the tooth-shaped structure at the lower end of the load-bearing nut (37) and the tooth-shaped structure at the upper end of the safety nut (38). An observation window is provided on the lifting column (34) corresponding to the meshing position of the load-bearing nut (37) and the safety nut (38).
6. The jet bridge for the front side door of an aircraft according to claim 5, characterized in that, Below the support column (33) of the first lifting column structure (8), two steering wheels (41) and two universal wheels (42) are provided; below the support columns (33) of the second lifting column structure (9) and the third lifting column structure (10), one steering wheel (41) and one universal wheel (42) are provided.
7. The jet bridge for the front side door of an aircraft according to claim 1, characterized in that, The second connecting telescopic platform (3) is connected to the first hatch telescopic platform (5) through a flexible connection structure (7). The flexible connection structure (7) includes a convex mounting base (21) provided on the second connecting telescopic platform (3) and a concave mounting base (45) provided on the first hatch telescopic platform (5). The convex mounting base (21) is inserted into the concave mounting base (45). A spherical plain bearing (47) is provided in the convex mounting base (21). A quick-release pin (46) passes through the spherical plain bearing (47) of the convex mounting base (21) and the concave mounting base (45). The hole through which the quick-release pin (46) passes on the concave mounting base (45) is an oblong hole, and there is a certain gap between the convex mounting base (21) and the concave mounting base (45).
8. The jet bridge for the front side door of an aircraft according to claim 1, characterized in that Fixed guardrails (39) are provided on both the front and rear sides of the connection fixed platform (1) and the hatch fixed platform (4). Horizontal telescopic guardrails (40) are slidably connected to the left and right sides of each fixed guardrail (39) on the connection fixed platform (1) and the left and right sides of the fixed guardrail (39) on the hatch fixed platform (4) away from the aircraft. Each horizontal telescopic guardrail (40) is connected to the first connecting telescopic platform (2), the second connecting telescopic platform (3), the first hatch telescopic platform (5), and the second hatch telescopic platform (6) at the corresponding positions. The extension and retraction of the first connecting telescopic platform (2), the second connecting telescopic platform (3), the first hatch telescopic platform (5), and the second hatch telescopic platform (6) drive the extension and retraction of the respective horizontal telescopic guardrails (40).
9. The jet bridge according to claim 1 for the front side door of the aircraft, characterized in that, Pull-out plates (43) are provided on the sides of the hatch fixed platform (4), the first hatch telescopic platform (5), and the second hatch telescopic platform (6) close to the aircraft.
10. The jet bridge for the front side door of an aircraft according to claim 9, wherein, A longitudinal telescopic guardrail (44) is provided on the side close to the aircraft at the docking position of the second connecting telescopic platform (3) and the first hatch telescopic platform (5).