A kind of follow-up aircraft maintenance lifting work ladder with self-locking device

Abstract

The present invention provides a follow-up aircraft maintenance and lifting work ladder with a self-locking device, which includes a fixed ladder structure located at the bottom, a quadrilateral mechanism is hinged at the top of the fixed ladder structure, a top ladder structure is hingedly supported at the top of the quadrilateral structure, a follow-up climbing ladder structure is installed on the quadrilateral structure, the follow-up climbing ladder structure connects the fixed body structure and the top ladder structure, a linked traction stop mechanism for supporting and stopping the entire work ladder is fixedly installed at the head of the fixed ladder structure, and a lifting mechanism for driving the top ladder structure to rise and fall is installed between the linked traction stop mechanism and the top ladder structure. This work ladder structurally divides the climbing ladder into two sections: a fixed ladder and a follow-up movable ladder, and uses the principle that the opposite sides of the regular parallelogram mechanism are always kept parallel during the movement process to realize the horizontal parallel follow-up of the movable ladder pedal and the work surface during the ladder lifting process.

Description

Technical Field

[0001] The invention relates to the field of aircraft maintenance equipment, in particular to a follow-up aircraft maintenance lifting working ladder with a self-locking device. Background Art

[0002] During the aircraft maintenance process, a maintenance ladder is needed. In order to meet the maintenance needs of parts at different heights, an elevator is used.

[0003] The lifting work ladder is mainly used to carry personnel to maintain the wings, fuselage and engine of the aircraft. It is used to carry personnel to inspect, lubricate, repair, troubleshoot and debug during various maintenance preparations and scheduled inspections and repairs of the aircraft.

[0004] At present, various types of mechanical lifting work ladders commonly used still have the following shortcomings:

[0005] (1) Currently, most ladders are fixed structures, with auxiliary pull-out or telescopic structures to adapt to different heights of work surfaces. After each lifting, they need to be pulled out, adjusted and fixed, and there are many operating steps.

[0006] (2) Currently, commonly used work ladders often use multiple manual spiral lifting mechanisms to stop the wheels and provide stable support for the work ladder. During operation, the spiral support rods need to be rotated one by one by manpower, which is cumbersome to operate and has low work efficiency.

[0007] (3) Currently, most commonly used work ladders are integrally welded structures, which are large in size and not convenient for transfer and transportation.

[0008] (4) The lifting mechanism and moving parts are prone to rust and become stuck. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a follow-up aircraft maintenance and lifting work ladder with a self-locking device. The work ladder is structurally divided into two sections: a fixed ladder and a follow-up movable ladder. The principle that the opposite sides of a regular parallelogram mechanism always remain parallel during movement is used to realize the horizontal parallel follow-up of the movable ladder pedal and the work surface during the ladder lifting process; a linked traction and stopping mechanism is adopted to integrate multiple functions such as wheel traction, steering, stopping and support, and the stopping support rod is linked with the traction rod through a connecting rod mechanism. When the traction rod is unfolded and stored, the connecting rod mechanism can realize the linked action of retracting and extending the stopping support rod, thereby simplifying the operation process, shortening the deployment and withdrawal time of the work ladder, and improving work efficiency; a gear rack synchronous transmission lifting mechanism, a ratchet pawl self-locking device, and a safety pin are used to strengthen the safety protection of the ladder.

[0010] In order to realize the above-mentioned technical features, the purpose of the present invention is achieved as follows: a follow-up aircraft maintenance and lifting work ladder with a self-locking device, which includes a fixed ladder structure located at the bottom layer, the top of the fixed ladder structure is hinged with a quadrilateral mechanism, the top of the quadrilateral mechanism is hingedly supported with a top ladder structure, a follow-up climbing structure is installed on the quadrilateral mechanism, the follow-up climbing structure connects the fixed ladder structure and the top ladder structure, a linked traction stop mechanism for supporting and stopping the entire work ladder is fixedly installed at the head of the fixed ladder structure, and a lifting mechanism for driving the top ladder structure to rise and fall is installed between the linked traction stop mechanism and the top ladder structure.

[0011] The fixed ladder structure comprises a fixed ladder frame, a tail wheel is fixedly mounted at the bottom of the fixed ladder frame, a bottom ladder frame is mounted on the side of the fixed ladder frame, a bottom step plate is mounted between the bottom ladder frames, and first handrails are fixed on both sides of the bottom ladder frame.

[0012] The top ladder structure includes a top ladder bottom plate, a top platform is fixed on the top of the top ladder bottom plate, the top ladder bottom plate and the top platform are connected via a top step plate, a second handrail is arranged on the periphery of the top ladder bottom plate, and a third handrail is arranged on the periphery of the top platform.

[0013] The quadrilateral mechanism includes a first quadrilateral frame and a second quadrilateral frame, the bottom ends of the first quadrilateral frame and the second quadrilateral frame are respectively hinged to the top end of the fixed ladder frame of the fixed ladder structure through a bottom quadrilateral hinge seat, and the top ends of the first quadrilateral frame and the second quadrilateral frame are respectively hinged to the bottom end of the top ladder bottom plate of the top ladder structure through a top quadrilateral hinge seat; the first quadrilateral frame and the second quadrilateral frame are arranged in a parallel structure.

[0014] The follower ladder structure includes a pedal fixing frame fixed between the first quadrilateral frames of the quadrilateral mechanism, a follower pedal is hinged between the pedal fixing frames, the bottom of the follower pedal is hingedly connected to the follower pull rod through a follower connecting plate, and the top of the follower pull rod is fixed to the bottom end of the top ladder bottom plate of the top ladder structure through a pull rod hinge seat; the follower pull rod remains parallel to the first quadrilateral frame of the quadrilateral mechanism.

[0015] The lifting mechanism comprises lifting sleeves arranged symmetrically, the lifting sleeves are fixedly connected by a reinforcing structure, a lifting rod is installed inside each lifting sleeve by sliding fit, a rectangular notch is processed in the middle of the lifting sleeve, a gear is installed at the position of the rectangular notch through a gear mounting seat, the gear is installed on the transmission shaft, the gear is meshed with a rack processed on the outer wall of the lifting rod, and drives the entire lifting rod to achieve lifting; rocker arms are installed at both ends of the transmission shaft, and a handle is installed at the other end of the rocker arm;

[0016] A bottom hinge seat is fixed at the bottom of the lifting sleeve; a top hinge seat is fixedly installed at the top of the lifting rod; the bottom hinge seat is hingedly connected to the top of the linked traction stop mechanism, and the top hinge seat is hingedly connected to the bottom end of the top ladder bottom plate of the top ladder structure;

[0017] The reinforcement structure comprises a plurality of reinforcement cross bars connected between the lifting sleeves and inclined bracing bars arranged obliquely.

[0018] A ratchet pawl self-locking device is installed on one side of the gear mounting seat, and the ratchet pawl self-locking device includes a ratchet mounted on the transmission shaft, the ratchet and the pawl cooperate, and the pawl is hinged on the L-shaped mounting plate through a pin shaft, and the L-shaped mounting plate is fixed on the outer side wall of the gear mounting seat;

[0019] A tension spring connecting plate is fixedly installed on the top of the L-shaped mounting plate, a tension spring is connected to the tension spring connecting plate, and the other end of the tension spring is hooked and connected to a tension spring mounting seat fixed on the pawl;

[0020] A plurality of pin holes are processed on the top of the lifting rod, and safety pins are installed through the pin holes.

[0021] The linked traction stop mechanism comprises a frame, a plurality of rotating shaft seats are installed in parallel on one side of the top of the frame, a rotating shaft assembly is rotatably supported on the rotating shaft seat, a middle part of the rotating shaft assembly is fixedly connected to a middle rotating arm for driving the rotating shaft assembly, the middle rotating arm is connected to a connecting rod mechanism for driving the rotating shaft assembly, the connecting rod mechanism is cooperatively connected to a steering arm hinged at the bottom of the frame, the other end of the steering arm is connected to a wheel assembly through a steering tie rod, the wheel assembly is installed on both sides of the frame, and connecting rod brake mechanisms for braking are installed at both ends of the rotating shaft assembly;

[0022] The middle rotating arm is fixedly connected to the middle part of the rotating shaft assembly through a rotating arm fixing seat;

[0023] The end of the middle rotating arm is provided with a limit safety latch for limiting the position of the traction rod;

[0024] The steering arm is hinged to the bottom of the frame through a third pin shaft.

[0025] The connecting rod mechanism comprises a traction rod hinged to the tail of the steering arm through a first pin shaft, the bottom end of the traction rod is hingedly connected to the bottom end of the connecting rod through an ear plate, and the top end of the connecting rod is hingedly connected to the middle rotating arm through a pin shaft;

[0026] The wheel assembly includes an axle hinge seat fixed on the two outer side walls of the frame, a wheel is hinged on the axle hinge seat, the axle of the wheel is hingedly connected to the steering rod through an arc arm; the steering arm is hingedly connected to the middle part of the steering rod through a second pin shaft.

[0027] The connecting rod brake mechanism includes an external rotating arm fixed at the two ends of the rotating shaft assembly, and the other end of the external rotating arm is hingedly connected to the top of the stop support rod through a double-headed hinge plate. The stop support rod is installed inside the column through sliding fit, and the column is arranged on both sides of the frame.

[0028] The present invention has the following beneficial effects:

[0029] 1. Structurally, the ladder is divided into two sections: a fixed ladder structure and a top ladder structure. The principle that the opposite sides of a quadrilateral mechanism always remain parallel during movement is used to achieve horizontal parallel following of the follow-up ladder structure and the top ladder structure during the ladder lifting process.

[0030] 2. The linked traction and stopping mechanism is adopted to integrate the traction, steering, stopping and support functions of the wheels. The stopping support rod is linked with the traction rod through a connecting rod mechanism. When the traction rod is unfolded and stored, the stopping support rod can be retracted and extended through the connecting rod mechanism, which simplifies the operation process, shortens the deployment and withdrawal time of the working ladder, and improves work efficiency.

[0031] 3. This lifting mechanism can be used for the lifting and lowering of the lifting aircraft maintenance ladder, replacing the traditional pull-out lifting method, improving the convenience of the lifting operation and improving the efficiency of the lifting operation.

[0032] 4. The gear rack transmission mechanism can be used to drive the lifting rod to move up and down inside the lifting sleeve, thereby driving the platform supported on the top of the lifting rod to move up and down, so as to achieve the purpose of adjusting the maintenance height.

[0033] 5. The ratchet pawl self-locking device can be used for self-locking, thereby ensuring that the lifting rod is locked after the height is raised to the required level.

[0034] 6. Install one-way thrust ball bearings at the wheel turning point to reduce rotational resistance, and set oiling nozzles to lubricate the rotating parts to improve the flexibility of the mechanism movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] Figure 1 This is a three-dimensional diagram from the first perspective of the present invention.

[0037] Figure 2 This is a three-dimensional diagram from a second viewing angle of the present invention.

[0038] Figure 3 It is a three-dimensional diagram from the third viewing angle of the present invention.

[0039] Figure 4 This is a three-dimensional diagram of the lifting mechanism of the present invention from the first perspective.

[0040] Figure 5 This is a three-dimensional diagram of the lifting mechanism of the present invention from a second viewing angle.

[0041] Figure 6 This is a three-dimensional diagram of the lifting mechanism of the present invention from the third viewing angle.

[0042] Figure 7 It is the front view of the lifting mechanism of the present invention.

[0043] Figure 8 For the present invention Figure 7 Medium AA view.

[0044] Fig. 9 This is a three-dimensional diagram from the first perspective of the linked traction stop mechanism of the present invention.

[0045] Fig.10 This is a three-dimensional diagram from a second viewing angle of the linked traction stop mechanism of the present invention.

[0046] Fig.11 This is a three-dimensional diagram from the third perspective of the linked traction stop mechanism of the present invention.

[0047] Fig.12 This is a state diagram of the linked traction stop mechanism of the present invention when it is in traction.

[0048] In the figure: a fixed ladder structure 1, a follow-up ladder structure 2, a top ladder structure 3, a quadrilateral mechanism 4, a lifting mechanism 5, and a linked traction stop mechanism 6;

[0049] Fixed ladder frame 101, tail wheel 102, bottom ladder frame 103, bottom step plate 104, first handrail 105;

[0050] Top ladder bottom plate 301, top step plate 302, top platform 303, third handrail 304, second handrail 305;

[0051] A first quadrilateral frame 401, a bottom quadrilateral hinge seat 402, a second quadrilateral frame 403, and a top quadrilateral hinge seat 404;

[0052] Bottom hinge seat 501, reinforcing cross bar 502, diagonal support rod 503, lifting sleeve 504, handle 505, rocker arm 506, gear 507, rectangular notch 508, gear mounting seat 509, transmission shaft 510, safety latch 511, pin hole 512, lifting rod 513, top hinge seat 514, tension spring connecting plate 515, L-shaped mounting plate 516, pawl 517, pin 518, ratchet 519, tension spring 520, tension spring mounting seat 521, rack 522;

[0053] Towing rod 601, middle rotating arm 602, limit safety pin 603, rotating shaft assembly 604, rotating shaft seat 605, external rotating arm 606, double-headed hinge plate 607, column 608, arc arm 609, axle hinge seat 610, wheel 611, stop support rod 612, connecting rod 613, first pin shaft 614, ear plate 615, third pin shaft 616, steering arm 617, second pin shaft 618, steering tie rod 619, frame 620, rotating arm fixing seat 621. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0055] See also Figure 1-12 A self-locking device-assisted aircraft maintenance and lifting work ladder comprises a fixed ladder structure 1 at the bottom, a quadrilateral mechanism 4 is hinged on the top of the fixed ladder structure 1, a top ladder structure 3 is hinged on the top of the quadrilateral mechanism 4, a assisted climbing ladder structure 2 is installed on the quadrilateral mechanism 4, the assisted climbing ladder structure 2 connects the fixed ladder structure 1 and the top ladder structure 3, a linkage traction stop mechanism 6 for supporting and stopping the entire work ladder is fixedly installed on the head of the fixed ladder structure 1, and a lifting mechanism 5 for driving the top ladder structure 3 to rise and fall is installed between the linkage traction stop mechanism 6 and the top ladder structure 3. By adopting the above structure

[0056] Further, the fixed ladder structure 1 includes a fixed ladder frame 101, a tail wheel 102 is fixedly installed at the bottom of the fixed ladder frame 101, a bottom ladder frame 103 is installed on the side of the fixed ladder frame 101, a bottom step plate 104 is installed between the bottom ladder frames 103, and first handrails 105 are fixed on both sides of the bottom ladder frames 103. The fixed ladder structure 1 can support the entire ladder.

[0057] Furthermore, the top ladder structure 3 includes a top ladder bottom plate 301, a top platform 303 is fixed on the top of the top ladder bottom plate 301, the top ladder bottom plate 301 and the top platform 303 are connected via a top step plate 302, a second handrail 305 is arranged on the periphery of the top ladder bottom plate 301, and a third handrail 304 is arranged on the periphery of the top platform 303. The top ladder structure 3 can be raised and lowered to adjust the height of the ladder.

[0058] Furthermore, the quadrilateral mechanism 4 includes a first quadrilateral frame 401 and a second quadrilateral frame 403, the bottom ends of the first quadrilateral frame 401 and the second quadrilateral frame 403 are respectively hinged to the top end of the fixed ladder frame 101 of the fixed ladder structure 1 through a bottom quadrilateral hinge seat 402, and the top ends of the first quadrilateral frame 401 and the second quadrilateral frame 403 are respectively hinged to the bottom end of the top ladder bottom plate 301 of the top ladder structure 3 through a top quadrilateral hinge seat 404; the first quadrilateral frame 401 and the second quadrilateral frame 403 are arranged in a parallel structure. The above-mentioned quadrilateral mechanism 4 can realize the horizontal parallel follow-up of the movable ladder pedal and the work surface during the ladder lifting process by the principle that the opposite sides are always kept parallel during the movement.

[0059] Further, the follow-up ladder structure 2 includes a pedal fixing frame 202 fixed between the first quadrilateral frames 401 of the quadrilateral mechanism 4, a follow-up pedal 201 is hinged between the pedal fixing frames 202, the bottom of the follow-up pedal 201 is hingedly connected to the follow-up rod 203 through a follow-up connecting plate 205, and the top of the follow-up rod 203 is fixed to the bottom end of the top ladder bottom plate 301 of the top ladder structure 3 through a rod hinge seat 204; the follow-up rod 203 is kept parallel to the first quadrilateral frame 401 of the quadrilateral mechanism 4. The follow-up ladder structure 2 ensures that the follow-up pedal 201 can always maintain a horizontal state during the lifting process of the top ladder structure 3.

[0060] Furthermore, the lifting mechanism 5 includes symmetrically arranged lifting sleeves 504, which are fixedly connected by a reinforcing structure, and a lifting rod 513 is installed inside each lifting sleeve 504 through sliding fit. A rectangular notch 508 is processed in the middle part of the lifting sleeve 504, and a gear 507 is installed at the position of the rectangular notch 508 through a gear mounting seat 509. The gear 507 is installed on the transmission shaft 510, and the gear 507 is meshed with a rack 522 processed on the outer wall of the lifting rod 513 for transmission, and drives the entire lifting rod 513 to achieve lifting; rocker arms 506 are installed at both ends of the transmission shaft 510, and a handle 505 is installed at the other end of the rocker arm 506; this lifting mechanism can be used for the lifting and lowering action of a lifting aircraft maintenance ladder, replacing the traditional pull-out lifting method, improving the convenience of the lifting operation, and improving the efficiency of the lifting operation.

[0061] Furthermore, a bottom hinged seat 501 is fixed to the bottom of the lifting sleeve 504; a top hinged seat 514 is fixed to the top of the lifting rod 513; the bottom hinged seat 501 is hingedly connected to the top of the linked traction stop mechanism 6, and the top hinged seat 514 is hingedly connected to the bottom end of the top ladder bottom plate 301 of the top ladder structure 3; the reinforcement structure includes a plurality of reinforcement cross bars 502 connected between the lifting sleeves 504 and obliquely arranged diagonal support bars 503.

[0062] Furthermore, a ratchet pawl self-locking device is installed on one side of the gear mounting seat 509, and the ratchet pawl self-locking device includes a ratchet 519 installed on the transmission shaft 510, the ratchet 519 cooperates with a pawl 517, and the pawl 517 is hinged on the L-shaped mounting plate 516 through a pin 518, and the L-shaped mounting plate 516 is fixed on the outer wall of the gear mounting seat 509; the ratchet pawl self-locking device is mainly used to lock the transmission shaft 510, thereby ensuring that after the height is raised to the right position, the height of the lifting rod 13 can be locked to prevent it from automatically falling, thereby ensuring safety.

[0063] Furthermore, a tension spring connecting plate 515 is fixedly installed on the top of the L-shaped mounting plate 516, and a tension spring 520 is connected to the tension spring connecting plate 515. The other end of the tension spring 520 is hooked and connected to a tension spring mounting seat 521 fixed on the pawl 517; a plurality of pin shaft holes 512 are processed on the top of the lifting rod 513, and a safety pin 511 is installed through the pin shaft hole 512.

[0064] Furthermore, the linked traction stop mechanism 6 includes a skeleton 620, a plurality of rotating shaft seats 605 are installed in parallel on one side of the top of the skeleton 620, a rotating shaft assembly 604 is rotatably supported on the rotating shaft seat 605, the middle part of the rotating shaft assembly 604 is fixedly connected to a middle rotating arm 602 for driving the rotation thereof, the middle rotating arm 602 is connected to a connecting rod mechanism for driving the rotation thereof, the connecting rod mechanism is cooperatively connected to a steering arm 617 hinged at the bottom of the skeleton 620, and the steering arm 617 is The other end is connected to the wheel assembly through a steering rod 619, and the wheel assembly is installed on both sides of the frame 620. The two ends of the rotating shaft assembly 604 are installed with a connecting rod brake mechanism for braking; the middle rotating arm 602 is fixedly connected to the middle part of the rotating shaft assembly 604 through a rotating arm fixing seat 621; the end of the middle rotating arm 602 is inserted with a limit safety pin 603 for limiting the traction rod 601; the steering arm 617 is hinged to the bottom of the frame 620 through a third pin 616. By adopting the traction stop mechanism of the above structure, the traction, steering, stop and support functions of the wheel are integrated together to form a separate module, which can be disassembled and installed with the ladder as a whole.

[0065] Furthermore, the connecting rod mechanism includes a traction rod 601 hinged at the tail end of the steering arm 617 through a first pin 614, the bottom end of the traction rod 601 is hingedly connected to the bottom end of the connecting rod 613 through an ear plate 615, and the top end of the connecting rod 613 is hingedly connected to the middle rotating arm 602 through a pin; the connecting rod mechanism can be used to drive the rotation of the rotating shaft assembly 604 through the rotation of the traction rod 601, thereby transmitting torque.

[0066] Furthermore, the wheel assembly includes a wheel axle hinge seat 610 fixed on the two outer side walls of the frame 620, and a wheel 611 is hinged on the wheel axle hinge seat 610, and the wheel axle of the wheel 611 is hingedly connected to the steering tie rod 619 through the arc arm 609; the steering arm 617 is hingedly connected to the middle part of the steering tie rod 619 through the second pin 618. The above-mentioned wheel assembly can support the entire device and can cooperate with the tractor to realize the movement of the entire device. When steering is required, the steering tie rod 619 is driven by the steering arm 617, and then the arc arm 609 is driven by the steering tie rod 619 to rotate around the wheel axle hinge seat 610, thereby driving the wheel 611 to achieve steering.

[0067] Furthermore, the connecting rod brake mechanism includes an external rotating arm 606 fixed at two ends of the rotating shaft assembly 604, the other end of the external rotating arm 606 is hingedly connected to the top of the stop support rod 612 through a double-headed hinge plate 607, and the stop support rod 612 is installed inside the column 608 through sliding fit, and the column 608 is arranged on both sides of the frame 620. The above-mentioned connecting rod brake mechanism can be used to drive the stop support rod 612 to extend or retract, thereby achieving stop support or normal walking.

[0068] The working process and principle of the present invention are:

[0069] 1. The principle that the opposite sides of the quadrilateral mechanism 4 are always kept parallel during the movement is used to realize the follow-up of the top ladder structure 3 and the follow-up ladder structure 2, and the pedals of the top ladder structure 3 and the follow-up ladder structure 2 can be kept parallel to the ground at all times, thereby ensuring the safety during the ladder climbing process.

[0070] 2. By forming a regular parallelogram mechanism with four hinge points of the fixed ladder assembly, the movable ladder assembly, the connecting frame assembly, the parallel hinged frame and the upper working table, the movable ladder and the upper working platform can follow the movement during the lifting process. When the ladder is lifted or lowered, the angle between the movable ladder, the parallel hinged frame and the ground will change, but the upper table can always remain parallel to the ground.

[0071] 3. A plurality of regular parallelogram mechanisms are formed between the hinge points among the pedals, the linkage rods and the upper working platform of the movable ladder assembly, so that the pedals in the movable ladder assembly can follow the movement during the lifting process of the ladder and the upper plane of the pedals can always be kept parallel to the ground.

[0072] 4. The upper surface of the step and the upper work surface of the movable ladder are the passage and working area for people to go up and down the ladder, and must be kept parallel to the ground.

[0073] 5. When the working ladder is in the working state and the parking state, the traction rod 601 is pulled to rotate upward for folding and storage. At this time, the stop support rod 612 extends downward to support the ground through the connecting rod brake mechanism, so that the wheel 611 is about 5 to 10 mm off the ground, which plays the role of stopping support and improves the stability of the working ladder. At this time, the limit safety pin 603 should be inserted to limit the downward rotation of the traction rod to play a role of safety protection.

[0074] 6. When the working ladder is in the traction state, pull the traction rod 601 to rotate downward to unfold it. At this time, the stop support rod 612 is retracted upward through the connecting rod brake mechanism. At this time, the wheel 611 is on the ground and in contact with the ground. It can be pulled and towed by the traction rod. During the traction process, the traction rod is swung left and right, and the steering of the wheel is achieved through the linkage of the steering rod.

[0075] 7. When lifting operation is required, the rocker arm 506 is manually rotated to drive the transmission shaft 510 to rotate, and the transmission shaft 510 drives the gear 507. The gear 507 is meshed with the rack 522 on the side wall of the lifting rod 513 to drive it along the lifting sleeve 504 to achieve lifting action, thereby adjusting the height of the top maintenance platform. After the height is adjusted to the right position, the ratchet pawl self-locking device is mainly used to lock the transmission shaft 510.

Claims

1. A follow-up aircraft maintenance and lifting work ladder with a self-locking device, characterized in that: It comprises a fixed ladder structure (1) located at the bottom layer, the top of the fixed ladder structure (1) is hingedly connected to a quadrilateral mechanism (4), the top of the quadrilateral mechanism (4) is hingedly supported to a top ladder structure (3), a follow-up ladder structure (2) is installed on the quadrilateral mechanism (4), the follow-up ladder structure (2) connects the fixed ladder structure (1) and the top ladder structure (3), a linked traction stop mechanism (6) for supporting and stopping the entire working ladder is fixedly installed at the head of the fixed ladder structure (1), and a lifting mechanism (5) for driving the top ladder structure (3) to rise and fall is installed between the linked traction stop mechanism (6) and the top ladder structure (3); The fixed ladder structure (1) comprises a fixed ladder frame (101), a tail wheel (102) is fixedly mounted on the bottom of the fixed ladder frame (101), a bottom ladder frame (103) is mounted on the side of the fixed ladder frame (101), a bottom step plate (104) is mounted between the bottom ladder frames (103), and first handrails (105) are fixed on both sides of the bottom ladder frames (103); The top ladder structure (3) comprises a top ladder bottom plate (301), a top platform (303) is fixed on the top of the top ladder bottom plate (301), the top ladder bottom plate (301) and the top platform (303) are connected via a top step plate (302), a second handrail (305) is arranged on the periphery of the top ladder bottom plate (301), and a third handrail (304) is arranged on the periphery of the top platform (303); The quadrilateral mechanism (4) comprises a first quadrilateral frame (401) and a second quadrilateral frame (403); the bottom ends of the first quadrilateral frame (401) and the second quadrilateral frame (403) are respectively hinged to the top end of the fixed ladder frame (101) of the fixed ladder structure (1) through a bottom quadrilateral hinge seat (402); the top ends of the first quadrilateral frame (401) and the second quadrilateral frame (403) are respectively hinged to the bottom end of the top ladder bottom plate (301) of the top ladder structure (3) through a top quadrilateral hinge seat (404); the first quadrilateral frame (401) and the second quadrilateral frame (403) are arranged in a parallel structure; The follower ladder structure (2) comprises a pedal fixing frame (202) fixed between the first quadrilateral frames (401) of the quadrilateral mechanism (4); a follower pedal (201) is hingedly connected between the pedal fixing frames (202); the bottom of the follower pedal (201) is hingedly connected to a follower pull rod (203) via a follower connecting plate (205); the top of the follower pull rod (203) is fixed to the bottom end of the top ladder bottom plate (301) of the top ladder structure (3) via a pull rod hinge seat (204); the follower pull rod (203) is kept parallel to the first quadrilateral frame (401) of the quadrilateral mechanism (4); The lifting mechanism (5) comprises lifting sleeves (504) arranged symmetrically, wherein the lifting sleeves (504) are fixedly connected to each other via a reinforcement structure, and a lifting rod (513) is installed inside each lifting sleeve (504) via a sliding fit, and a rectangular notch (508) is processed in the middle of the lifting sleeve (504), and a gear (507) is installed at the position of the rectangular notch (508) via a gear mounting seat (509), and the gear (507) is installed on a transmission shaft (510), and the gear (507) meshes with a rack (522) processed on the outer wall of the lifting rod (513) for transmission, and drives the entire lifting rod (513) to achieve lifting; rocker arms (506) are installed at both ends of the transmission shaft (510), and a handle (505) is installed at the other end of the rocker arm (506); A bottom hinge seat (501) is fixed to the bottom of the lifting sleeve (504); a top hinge seat (514) is fixed to the top of the lifting rod (513); the bottom hinge seat (501) is hingedly connected to the top of the linked traction stop mechanism (6); and the top hinge seat (514) is hingedly connected to the bottom end of the top ladder bottom plate (301) of the top ladder structure (3); The reinforcement structure comprises a plurality of reinforcement cross bars (502) connected between the lifting sleeves (504) and inclined bracing bars (503); A ratchet pawl self-locking device is installed on one side of the gear mounting seat (509), the ratchet pawl self-locking device comprises a ratchet (519) installed on the transmission shaft (510), the ratchet (519) cooperates with a pawl (517), the pawl (517) is hinged on an L-shaped mounting plate (516) through a pin (518), and the L-shaped mounting plate (516) is fixed on the outer side wall of the gear mounting seat (509); A tension spring connecting plate (515) is fixedly mounted on the top of the L-shaped mounting plate (516), a tension spring (520) is connected to the tension spring connecting plate (515), and the other end of the tension spring (520) is hooked and connected to a tension spring mounting seat (521) fixed on the pawl (517); A plurality of pin holes (512) are machined on the top of the lifting rod (513), and a safety pin (511) is installed through the pin hole (512); The linked traction stop mechanism (6) comprises a frame (620), a plurality of rotating shaft seats (605) are installed in parallel on one side of the top of the frame (620), a rotating shaft assembly (604) is rotatably supported on the rotating shaft seat (605), a middle portion of the rotating shaft assembly (604) is fixedly connected to a middle rotating arm (602) for driving the rotating shaft assembly (604), the middle rotating arm (602) is connected to a connecting rod mechanism for driving the rotating shaft assembly (604), the connecting rod mechanism is cooperatively connected to a steering arm (617) hinged at the bottom of the frame (620), the other end of the steering arm (617) is connected to a wheel assembly via a steering tie rod (619), the wheel assembly is installed on both sides of the frame (620), and connecting rod brake mechanisms for braking are installed at both ends of the rotating shaft assembly (604); The middle rotating arm (602) is fixedly connected to the middle part of the rotating shaft assembly (604) via a rotating arm fixing seat (621); A position limiting safety latch (603) for limiting the position of the traction rod (601) is inserted at the end of the middle rotating arm (602); The steering arm (617) is hinged to the bottom of the frame (620) via a third pin shaft (616); The connecting rod mechanism comprises a traction rod (601) hingedly connected to the tail of a steering arm (617) via a first pin shaft (614); the bottom end of the traction rod (601) is hingedly connected to the bottom end of a connecting rod (613) via an ear plate (615); the top end of the connecting rod (613) is hingedly connected to a middle rotating arm (602) via a pin shaft; The wheel assembly comprises a wheel axle hinge seat (610) fixed on two outer side walls of the frame (620); a wheel (611) is hingedly connected to the wheel axle hinge seat (610); the wheel axle of the wheel (611) is hingedly connected to a steering rod (619) via an arc-shaped arm (609); the steering arm (617) is hingedly connected to a middle portion of the steering rod (619) via a second pin shaft (618); The connecting rod brake mechanism comprises an external rotating arm (606) fixed at two ends of the rotating shaft assembly (604), the other end of the external rotating arm (606) is hingedly connected to the top of the stop support rod (612) through a double-headed hinge plate (607), and the stop support rod (612) is installed inside the column (608) through sliding fit, and the column (608) is arranged on both sides of the frame (620).

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