Servo folding built-in boarding ladder

Abstract

The application discloses a kind of follow-up folding built-in boarding ladder, including outer tube, first inner tube, second inner tube, first pedal, second pedal, third pedal, first support rod and second support rod;Outer tube upper end is hinged with aircraft, lower end left side is hinged with first pedal, second inner tube can slide relative to first inner tube, first inner tube can slide relative to outer tube, second pedal is hinged with first inner tube lower end right side, third pedal is hinged with second inner tube lower end left side, first support rod one end is hinged with second support rod one end, first support rod other end is hinged with first inner tube lower end front side, second support rod other end is hinged with outer tube lower end front side;The application has the advantages that: folding and unfolding are convenient, the space occupied after folding is small, it is suitable for military aircraft use, quick boarding and disembarking can be realized, and the work of ground crew is reduced.

Description

Technical Field

[0001] This invention belongs to the field of aircraft structural design, specifically relating to a follow-up folding built-in boarding ladder. Background Technology

[0002] External boarding stairs are independent components, belonging to ground-based equipment, and require handling by ground crew, increasing their workload. Internal boarding stairs, on the other hand, are connected to the aircraft structure. Military aircraft use internal boarding stairs to provide convenient boarding and disembarking access for air and ground crew. Currently, the steps of telescopic pole-type internal boarding stairs, both domestically and internationally, are generally non-foldable or manually foldable. Non-foldable steps take up a lot of space when folded, while manually foldable steps reduce the ease of use. Summary of the Invention

[0003] In view of the above-mentioned prior art, the purpose of the present invention is to overcome the shortcomings of the prior art, adapt to the needs of reality, and thus provide a follow-up folding built-in boarding ladder based on a telescopic rod type random built-in boarding ladder.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a follow-up folding built-in boarding ladder, comprising an outer cylinder, a first inner cylinder, a second inner cylinder, a first step, a second step, a third step, a first support rod, and a second support rod; the upper end of the outer cylinder is hinged to the aircraft, and the lower left side is hinged to the first step; the outer cylinder is sleeved on the upper end of the first inner cylinder, the first inner cylinder is sleeved on the upper end of the second inner cylinder, and the second inner cylinder can slide relative to the first inner cylinder, and the first inner cylinder can slide relative to the outer cylinder; the second step is hinged to the lower right side of the first inner cylinder, the third step is hinged to the lower left side of the second inner cylinder, one end of the first support rod is hinged to one end of the second support rod, the other end of the first support rod is hinged to the lower front side of the first inner cylinder, and the other end of the second support rod is hinged to the lower front side of the outer cylinder; the second inner... When the inner tube retracts and slides within the first inner tube, it drives the third pedal to rotate upwards and thus come into contact with the lower left side of the outer tube. As the third pedal continues to move upwards, it comes into contact with the first pedal and pushes the first pedal to rotate upwards and come into contact with the upper left side of the outer tube. When the first inner tube retracts and slides within the outer tube, it drives the first support rod and the second pedal to rotate upwards, so that the second pedal comes into contact with the right side of the outer tube. When the first support rod rotates upwards, it pushes the second support rod to rotate upwards and come into contact with the front side of the outer tube together, thus completing the folding action of the boarding ladder. When the boarding ladder unfolds, the second inner tube slides out from the first inner tube, which drives the first inner tube to slide out from the outer tube. The first support rod and the second support rod unfold accordingly, and the first pedal, the second pedal, and the third pedal unfold under the action of gravity.

[0005] Furthermore, the overall shape of the first pedal, the second pedal, and the third pedal is a right-angled triangle.

[0006] Furthermore, the outer cylinder is provided with a first lug, a second lug, a third lug, and a first push rod. The first lug is located at the top of the outer cylinder, the second and third lugs are located on the left and front sides of the lower end of the outer cylinder, respectively, and the first push rod is located on the right side of the bottom of the outer cylinder. The first inner cylinder is provided with a fourth lug, a fifth lug, and a second push rod. The fourth lug is located on the right side of the lower end of the first inner cylinder, and there are two fifth lugs, which are located opposite each other on the front side of the lower end of the first inner cylinder. The second push rod is located on the left side of the bottom of the first inner cylinder. A sixth lug is located on the upper left side of the lower end of the second inner cylinder. The first pedal is provided with a first pedal mounting hole and a ferrule. The first pedal mounting hole is located at the right angle of the first pedal, and the ferrule is located on the long right-angle side of the first pedal with both ends pointing outwards. Extending further, the second pedal is provided with a second pedal mounting hole and a first folding connecting rod. The second pedal mounting hole is located at a right angle to the second pedal. One end of the first folding connecting rod is fixed to the long right-angle side of the second pedal, and the other end is located on the outside of the second pedal. The third pedal is provided with a third pedal mounting hole, a second folding connecting rod, a guide strip, and a groove. The third pedal mounting hole is located at a right angle to the third pedal. One end of the second folding connecting rod is fixed to the lower end of the long right-angle side of the third pedal, and the other end is located on the outside of the third pedal. The guide strip and the groove are both located on the upper end of the long right-angle side of the third pedal. The first support rod has a first support rod mounting hole and a second support rod mounting hole at both ends, and the second support rod has a third support rod mounting hole and a fourth support rod mounting hole at both ends.

[0007] Furthermore, the top of the outer cylinder is hinged to the aircraft via a first lug, and the lower left side of the outer cylinder is hinged to the first pedal mounting hole on the first pedal via a second lug, with the long right-angled side of the first pedal facing upwards. The lower front side of the outer cylinder is hinged to the fourth support rod mounting hole on the other end of the second support rod via a third lug. The lower right side of the first inner cylinder is hinged to the second pedal mounting hole on the second pedal via a fourth lug, with the long right-angled side of the second pedal facing upwards, and the other end of the first folding connecting rod facing the first top rod. The lower front side of the first inner cylinder is hinged to the second support rod mounting hole on the other end of the first support rod via two fifth lugs. The second inner cylinder is hinged to the third pedal mounting hole on the third pedal via a sixth lug, with the long right-angled side of the third pedal facing upwards, and the other end of the second folding connecting rod facing the second top rod. One end of the first support rod is connected to the third support rod mounting hole on one end of the second support rod via a first support rod mounting hole. The first and second struts are hinged together, with their hinged ends serving as support points. The struts are supported on the outer surface of the aircraft. When the second push rod contacts the other end of the second folding link, the push rod can rotate the second folding link around the mounting hole of the third pedal, thus causing the third pedal to rotate upwards. When the first inner cylinder retracts and slides, the first strut can fold upwards with the movement of the first inner cylinder, pushing the second strut upwards. When the first push rod contacts the other end of the first folding link, the push rod can rotate the first folding link around the mounting hole of the second pedal, thus causing the second pedal to rotate upwards. When the third pedal is fully folded and continues to move upwards, the groove on the third pedal can engage with the front and rear ends of the first pedal. When the guide edge strip on the third pedal contacts the flying edge strip on the first pedal, the guide edge strip can push up the flying edge strip on the first pedal, thus causing the first pedal to rotate around the mounting hole of the first pedal.

[0008] Furthermore, the groove has a width greater than the width of the first pedal and less than the outer width of the edge strip.

[0009] Furthermore, both the first and second struts have semi-circular ends and a rectangular structure in the middle.

[0010] Furthermore, the distance between the first and second support rod mounting holes at both ends of the first support rod is greater than the distance between the third and fourth support rod mounting holes at both ends of the second support rod, and the difference in the distance between the two holes is consistent with the distance between the third and fifth lugs when the boarding ladder is in the retracted state.

[0011] Furthermore, the first, second, and third pedals are all installed on both sides of the outer cylinder. The first and third pedals are located on the left side of the outer cylinder, with the first pedal located above the third pedal and the second pedal located on the right side of the outer cylinder.

[0012] The beneficial effects of the invention are: it is easy to fold and unfold, takes up little space when folded, is suitable for use in military aircraft, enables rapid boarding and disembarking, and reduces the workload of ground crew. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is an exploded view of the present invention;

[0015] Figure 3 This is a schematic diagram of the initial folding principle of the present invention;

[0016] Figure 4 This is a schematic diagram illustrating the principle of how the third pedal of the present invention pushes the first pedal to fold.

[0017] Figure 5 This is a schematic diagram of the unfolded form of the present invention.

[0018] The components are: 1. Outer cylinder, 2. First inner cylinder, 3. Second inner cylinder, 4. First pedal, 5. Second pedal, 6. Third pedal, 7. First support rod, 8. Second support rod, 11. First lug, 12. Second lug, 13. Third lug, 14. First top rod, 21. Fourth lug, 22. Fifth lug, 23. Second top rod, 31. Sixth lug, 41. First pedal mounting hole, 42. Flying edge strip, 51. Second pedal mounting hole, 52. First folding connecting rod, 61. Third pedal mounting hole, 62. Second folding connecting rod, 63. Guide edge strip, 64. Groove, 71. First support rod mounting hole, 72. Second support rod mounting hole, 78. Support point, 81. Third support rod mounting hole, 82. Fourth support rod mounting hole. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, the terms “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "connection," "provided with," "sleeve-in / connected," "clamp-in," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0023] like Figures 1 to 5 As shown, the present invention provides a follow-up folding built-in boarding ladder, including an outer cylinder 1, a first inner cylinder 2, a second inner cylinder 3, a first step 4, a second step 5, a third step 6, a first support rod 7, and a second support rod 8; the upper end of the outer cylinder 1 is hinged to the aircraft, and the lower left side is hinged to the first step 4. The outer cylinder 1 is sleeved on the upper end of the first inner cylinder 2, and the first inner cylinder 2 is sleeved on the upper end of the second inner cylinder 3, and the second inner cylinder 3 can slide relative to the first inner cylinder 2, and the first inner cylinder 2 can slide relative to the outer cylinder 1. The second step 5 is hinged to the lower right side of the first inner cylinder, and the third step 6 is hinged to the lower left side of the second inner cylinder 3. One end of the first support rod 7 is hinged to one end of the second support rod 8, and the other end of the first support rod 7 is hinged to the lower front side of the first inner cylinder 2. The other end of the second support rod 8 is hinged to the lower front side of the outer cylinder 1. The second inner cylinder 3 is... When the inner cylinder 2 retracts and slides, it can drive the third pedal 6 to rotate upward and thus come into contact with the lower left side of the outer cylinder 1. When the third pedal 6 continues to move upward, it can contact the first pedal 4 and push the first pedal 4 to rotate upward and come into contact with the upper left side of the outer cylinder 1. When the first inner cylinder 2 retracts and slides within the outer cylinder 1, it can drive the first support rod 7 and the second pedal 5 to rotate upward, so that the second pedal 5 comes into contact with the right side of the outer cylinder. When the first support rod 7 rotates upward, it can push the second support rod 8 to rotate upward and come into contact with the front side of the outer cylinder 1 together, thus completing the folding action of the boarding ladder. When the boarding ladder unfolds, the second inner cylinder 3 slides out from the first inner cylinder 2, driving the first inner cylinder 2 to slide out from the outer cylinder 1. The first support rod 7 and the second support rod 8 unfold accordingly. The first pedal 4, the second pedal 5 and the third pedal 6 unfold under the action of gravity.

[0024] Preferably, the overall shape of the first pedal 4, the second pedal 5, and the third pedal 6 is a right-angled triangle.

[0025] Preferably, the outer cylinder 1 is provided with a first lug 11, a second lug 12, a third lug 13, and a first push rod 14. The first lug 11 is located at the top of the outer cylinder 1, the second lug 12 and the third lug 13 are respectively located on the lower left side and the lower front side of the outer cylinder 1, and the first push rod 14 is located on the bottom right side of the outer cylinder 1. The first inner cylinder 2 is provided with a fourth lug 21, a fifth lug 22, and a second push rod 23. The fourth lug 21 is located on the lower right side of the first inner cylinder 2, and there are two fifth lugs 22. 22 are oppositely positioned on the lower front side of the first inner cylinder 2. The second push rod 23 is located on the bottom left side of the first inner cylinder 2. A sixth lug 31 is provided on the upper left side of the lower end of the second inner cylinder 3. The first pedal 4 is provided with a first pedal mounting hole 41 and a fly edge strip 42. The first pedal mounting hole 41 is located at the right angle of the first pedal 4. The fly edge strip 42 is located on the long right angle side of the first pedal 4 and extends outward at both ends. The second pedal 5 is provided with a second pedal mounting hole 51 and a first folding connecting rod 52. The second pedal mounting hole 51... 1. A first folding link 52 is located at a right angle to the second pedal 5. One end of the first folding link 52 is fixed to the long right-angle side of the second pedal 5, that is, one end of the first folding link 52 is fixed near the mounting hole 51 of the second pedal, and the other end is located on the outside of the second pedal 5. The third pedal 6 is provided with a third pedal mounting hole 61, a second folding link 62, a guide strip 63, and a groove 64. The third pedal mounting hole 61 is located at a right angle to the third pedal 6, and one end of the second folding link 62 is fixed to the long right-angle side of the third pedal 6. At the lower end, one end of the second folding link 62 is fixed near the mounting hole 61 of the third pedal, and the other end is located on the outside of the third pedal 6. The guide edge 63 and the groove 64 are both located on the upper end of the long right-angle side of the third pedal 6, that is, the guide edge 63 and the groove 64 are both located away from the mounting hole 61 of the third pedal. The first support rod 7 has a first support rod mounting hole 71 and a second support rod mounting hole 72 at both ends, and the second support rod 8 has a third support rod mounting hole 81 and a fourth support rod mounting hole 82 at both ends.

[0026] Preferably, the top of the outer cylinder 1 is hinged to the aircraft via a first lug 11, the lower left side of the outer cylinder 1 is hinged to the first pedal mounting hole 41 on the first pedal 4 via a second lug 12, and the long right-angled side of the first pedal 4 is facing upwards, the lower front side of the outer cylinder 1 is hinged to the fourth support rod mounting hole 82 on the other end of the second support rod 8 via a third lug 13, and the lower right side of the first inner cylinder 2 is hinged to the second pedal mounting hole 51 on the second pedal 5 via a fourth lug 21, and the long right-angled side of the second pedal 5 is facing upwards, and the first fold... The other end of the folding connecting rod 52 is positioned towards the first top rod 14. The lower front side of the first inner cylinder 2 is hinged to the second support rod mounting hole 72 on the other end of the first support rod 7 via two fifth lugs 22. The second inner cylinder 3 is hinged to the third pedal mounting hole 61 on the third pedal 6 via a sixth lug 31, and the long right-angle side of the third pedal 6 is positioned upwards. The other end of the second folding connecting rod 62 is positioned towards the second top rod 23. One end of the first support rod 7 is connected to the third support rod mounting hole on one end of the second support rod 8 via the first support rod mounting hole 71. 81 is hinged. The hinged ends of the first support rod 7 and the second support rod 8 are support points 78, and are supported on the outer surface of the aircraft through support points 78. When the second top rod 23 contacts the other end of the second folding link 62, the second top rod 23 can drive the second folding link 62 to rotate around the third pedal mounting hole 61, thereby driving the third pedal 6 to rotate upward. When the first inner cylinder 2 is retracted and slid, the first support rod 7 can fold upward with the movement of the first inner cylinder 2, and push the second support rod 8 to fold upward. When the first top rod 14 contacts the other end of the first folding link 52, the first top rod 14 can drive the first folding link 52 to rotate around the second pedal mounting hole 51, thereby driving the second pedal 5 to rotate upward. When the third pedal 6 is fully folded and continues to move upward, the groove 64 on the third pedal 6 can be engaged with the front and rear ends of the first pedal 4. When the guide edge strip 63 on the third pedal 6 contacts the flying edge strip 42 on the first pedal 4, the guide edge strip 63 can push up the flying edge strip 42 on the first pedal 4, thereby driving the first pedal 4 to rotate around the first pedal mounting hole 41.

[0027] Preferably, the groove 64 has a groove width greater than the width of the first pedal 4 and less than the outer contour width of the fly edge strip 42.

[0028] Preferably, both the first support rod 7 and the second support rod 8 have semi-circular ends and a rectangular structure in the middle.

[0029] Preferably, the distance between the first support rod mounting holes 71 and the second support rod mounting holes 72 at both ends of the first support rod 7 is greater than the distance between the third support rod mounting holes 81 and the fourth support rod mounting holes 82 at both ends of the second support rod 8, and the difference in the distance between the two holes is coordinated with the distance between the third ear piece 13 and the fifth ear piece 22 when the follow-up folding built-in boarding ladder is in the retracted state.

[0030] Preferably, the first pedal 4, the second pedal 5, and the third pedal 6 are all located on both sides of the outer cylinder 1 during installation. The first pedal 4 and the third pedal 6 are located on the left side of the outer cylinder 1, with the first pedal 4 located above the third pedal 6 and the second pedal 5 located on the right side of the outer cylinder 1.

[0031] The working principle of this invention is as follows: the folding process of the boarding ladder is as follows: Figure 3 As shown, the second inner cylinder 3 of the boarding ladder slides and contracts within the first inner cylinder 2. When it slides to a certain position, the second top rod 23 contacts the second folding connecting rod 62, and continues to slide. The second top rod 23 drives the second folding connecting rod 62 to rotate around the third step mounting hole 61. When the second inner cylinder 3 is fully contracted, the third step 6 is folded. The first inner cylinder 2 slides and contracts within the outer cylinder 1. The first support rod 7 pushes the second support rod 8 to fold upwards. When it slides to a certain position, the first top rod 14 contacts the first folding connecting rod 52, and continues to slide. The first top rod 14 drives the first folding connecting rod 52 to rotate around the second step mounting hole 51. When the first inner cylinder 2 is fully contracted, the first support rod 7, the second support rod 8, and the second step 5 are folded. Figure 4 As shown, when the boarding ladder retracts to a certain position, the guide edge 63 on the third step 6 contacts the flying edge 42 on the first step 4, and the groove 64 on the third step 6 engages with the front and rear ends of the first step 4. When the third step 6 continues to slide, the guide edge 63 can push up the flying edge 42 on the first step 4, thereby driving the first step 4 to rotate around the first step mounting hole 41, and the boarding ladder completes retraction, and the first step 4 completes folding.

[0032] In the unfolding process of the boarding ladder of the present invention, the second inner cylinder 3 slides out from the first inner cylinder 2, which in turn drives the first inner cylinder 2 to slide out from the outer cylinder 1. The first support rod 7 and the second support rod 8 unfold accordingly, and the first step 4, the second step 5 and the third step 6 unfold under the action of gravity.

[0033] Use of the boarding ladder of this invention: After the boarding ladder is unfolded, the support point 78 is supported on the outer surface of the aircraft, such as... Figure 5 As shown.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0035] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A follow-up folding built-in boarding ladder, characterized in that: The system includes an outer cylinder, a first inner cylinder, a second inner cylinder, a first pedal, a second pedal, a third pedal, a first support rod, and a second support rod. The upper end of the outer cylinder is hinged to the aircraft, and the lower left side is hinged to the first pedal. The outer cylinder is fitted onto the upper end of the first inner cylinder, and the first inner cylinder is fitted onto the upper end of the second inner cylinder. The second inner cylinder can slide relative to the first inner cylinder, and the first inner cylinder can slide relative to the outer cylinder. The second pedal is hinged to the lower right side of the first inner cylinder, and the third pedal is hinged to the lower left side of the second inner cylinder. One end of the first support rod is hinged to one end of the second support rod, and the other end of the first support rod is hinged to the lower front side of the first inner cylinder. The other end of the second support rod is hinged to the lower front side of the outer cylinder. When the second inner cylinder slides and contracts within the first inner cylinder, it can cause the third pedal to rotate upwards and thus come into contact with the lower left side of the outer cylinder. When the third pedal continues to move upwards, it can contact the first pedal and push the first pedal to rotate upwards and thus come into contact with the upper left side of the outer cylinder. When the first inner cylinder slides and contracts within the outer cylinder, it can cause the first pedal to rotate upwards and thus come into contact with the upper left side of the outer cylinder. The first support rod and the second step rotate upwards, causing the second step to rest against the right side of the outer cylinder. When the first support rod rotates upwards, it pushes the second support rod upwards, causing them to rest against the front of the outer cylinder, thus completing the folding action of the boarding ladder. When the boarding ladder unfolds, the second inner cylinder slides out from the first inner cylinder, causing the first inner cylinder to slide out from the outer cylinder. The first and second support rods unfold accordingly, and the first, second, and third steps unfold under gravity. The distance between the first and second support rod mounting holes at both ends of the first support rod is greater than the distance between the third and fourth support rod mounting holes at both ends of the second support rod. The difference in distance between these holes is coordinated with the distance between the third and fifth lugs when the boarding ladder is in its retracted state. When installed, the first, second, and third steps are all located on both sides of the outer cylinder. The first and third steps are located on the left side of the outer cylinder, with the first step above the third step, and the second step on the right side of the outer cylinder.

2. The follow-up folding built-in boarding ladder according to claim 1, characterized in that: The first, second, and third pedals are all shaped like right-angled triangles.

3. The follow-up folding built-in boarding ladder according to claim 2, characterized in that: The outer cylinder is provided with a first lug, a second lug, a third lug, and a first push rod. The first lug is located at the top of the outer cylinder, the second and third lugs are located on the left and front sides of the lower end of the outer cylinder, respectively, and the first push rod is located on the right side of the bottom of the outer cylinder. The first inner cylinder is provided with a fourth lug, a fifth lug, and a second push rod. The fourth lug is located on the right side of the lower end of the first inner cylinder, and there are two fifth lugs, which are located opposite each other on the front side of the lower end of the first inner cylinder. The second push rod is located on the left side of the bottom of the first inner cylinder. A sixth lug is located on the upper left side of the lower end of the second inner cylinder. The first pedal is provided with a first pedal mounting hole and a ferrule. The first pedal mounting hole is located at the right angle of the first pedal, and the ferrule is located on the long right-angle side of the first pedal and extends outward at both ends. The second pedal has a second pedal mounting hole and a first folding connecting rod. The second pedal mounting hole is located at a right angle to the second pedal. One end of the first folding connecting rod is fixed to the long right-angle side of the second pedal, and the other end is located on the outside of the second pedal. The third pedal has a third pedal mounting hole, a second folding connecting rod, a guide strip, and a groove. The third pedal mounting hole is located at a right angle to the third pedal. One end of the second folding connecting rod is fixed to the lower end of the long right-angle side of the third pedal, and the other end is located on the outside of the third pedal. The guide strip and the groove are both located on the upper end of the long right-angle side of the third pedal. The first support rod has a first support rod mounting hole and a second support rod mounting hole at both ends, and the second support rod has a third support rod mounting hole and a fourth support rod mounting hole at both ends.

4. The follow-up folding built-in boarding ladder according to claim 3, characterized in that: The top of the outer cylinder is hinged to the aircraft via a first lug. The lower left side of the outer cylinder is hinged to the first pedal mounting hole on the first pedal via a second lug, with the long right-angled side of the first pedal facing upwards. The lower front side of the outer cylinder is hinged to the fourth support rod mounting hole on the other end of the second support rod via a third lug. The lower right side of the first inner cylinder is hinged to the second pedal mounting hole on the second pedal via a fourth lug, with the long right-angled side of the second pedal facing upwards, and the other end of the first folding link facing the first top rod. The lower front side of the first inner cylinder is hinged to the second support rod mounting hole on the other end of the first support rod via two fifth lugs. The second inner cylinder is hinged to the third pedal mounting hole on the third pedal via a sixth lug, with the long right-angled side of the third pedal facing upwards, and the other end of the second folding link facing the second top rod. One end of the first support rod is connected to the third support rod mounting hole on one end of the second support rod via the first support rod mounting hole. The first and second struts are hinged, with their hinged ends serving as support points, which support the aircraft's outer surface. When the second push rod contacts the other end of the second folding link, the second push rod can drive the second folding link to rotate around the third pedal mounting hole, thereby causing the third pedal to rotate upwards. When the first inner cylinder retracts and slides, the first strut can fold upwards with the movement of the first inner cylinder, pushing the second strut to fold upwards. When the first push rod contacts the other end of the first folding link, the first push rod can drive the first folding link to rotate around the second pedal mounting hole, thereby causing the second pedal to rotate upwards. When the third pedal is fully folded and continues to move upwards, the groove on the third pedal can engage with the front and rear ends of the first pedal. When the guide edge strip on the third pedal contacts the flying edge strip on the first pedal, the guide edge strip can push up the flying edge strip on the first pedal, thereby causing the first pedal to rotate around the first pedal mounting hole.

5. The follow-up folding built-in boarding ladder according to any one of claims 3 or 4, characterized in that: The groove has a width greater than the width of the first pedal and less than the outer width of the edge strip.

6. The follow-up folding built-in boarding ladder according to claim 1, characterized in that: Both the first and second struts have semi-circular ends and a rectangular structure in the middle.

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