CN212563055U - Follow-up type airplane maintenance lifting working ladder with self-locking device - Google Patents

Abstract

The utility model provides a take self-lock device's trailing type aircraft maintenance lift work ladder, it is including the fixed ladder structure that is located the bottom, the top of fixed ladder structure articulates there is quadrangle structure, the articulated top layer ladder structure that supports of quadrangle structure, the last follow-up cat ladder structure of installing of quadrangle structure, the follow-up cat ladder structure is linked together fixed ladder structure and top layer ladder structure, the head fixed mounting of fixed ladder structure has the interlock formula that is used for supporting the locking to whole work ladder and pulls detent mechanism, the interlock formula pulls the detent mechanism and installs the elevating system who is used for driving top layer ladder structure to go up and down between the top layer ladder structure. The ladder is structurally divided into a fixed ladder and a follow-up movable ladder, and the horizontal parallel follow-up of the movable ladder pedals and the working table top in the ladder lifting process is realized by utilizing the principle that opposite sides of a regular parallelogram mechanism are always kept parallel in the movement process.

Description

Follow-up type airplane maintenance lifting working ladder with self-locking device

Technical Field

The utility model relates to an aircraft maintenance equipment field, especially a take self-lock device's trailing type aircraft maintenance elevating work ladder.

Background

The aircraft maintenance in-process need be used to overhaul the cat ladder, in order to adapt to the maintenance demand at different high positions, through adopting the companion ladder.

The lifting working ladder is mainly used for bearing personnel to maintain the wings, the fuselage, the engine and other parts of the airplane, and the bearing personnel carries out the work of checking, lubricating, repairing, troubleshooting, debugging and the like when various kinds of aircrafts are prepared and regularly checked and maintained.

At present, various mechanical lifting working ladders commonly used have the following defects:

(1) at present, the ladder stand is a fixed ladder stand structure, is assisted to adopt a drawing type or a telescopic structure to adapt to different heights of a working table surface, needs to be drawn, adjusted and fixed after lifting at every time, and has multiple operation steps.

(2) The work ladder commonly used at present often adopts the locking of a plurality of manual spiral elevating system as the wheel and the outrigger of work ladder, and the during operation need rotate spiral bracing piece one by one through the manpower, complex operation, and work efficiency is low.

(3) Present work ladder commonly used is mostly whole welded type structure, and is bulky, the transportation of being not convenient for shifting.

(4) The lifting mechanism and the moving part are easy to be rusted and blocked.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a follow-up type aircraft maintenance lifting working ladder with a self-locking device, which structurally divides a ladder stand into a fixed ladder section and a follow-up movable ladder section, and realizes the horizontal parallel follow-up of a movable ladder pedal and a working table surface in the ladder lifting process by utilizing the principle that opposite sides of a positive parallelogram mechanism are always kept parallel in the movement process; the interlocking type traction stopping mechanism is adopted, a plurality of functions of traction, steering, stopping, supporting and the like of the wheels are integrated, the stopping support rod is interlocked with the traction rod through the connecting rod mechanism, and the traction rod can realize the retracting and extending interlocking actions of the stopping support rod through the connecting rod mechanism when being unfolded and stored, so that the operation flow is simplified, the unfolding and folding time of the working ladder is shortened, and the working efficiency is improved; a gear rack synchronous transmission lifting mechanism and a ratchet and pawl self-locking device are adopted, and safety protection of the ladder is enhanced by a safety pin.

In order to realize the technical characteristics, the purpose of the utility model is realized as follows: the utility model provides a take self-lock device's trailing type aircraft maintenance lift work ladder, it is including the fixed ladder structure that is located the bottom, the top of fixed ladder structure articulates there is quadrangle structure, the articulated top layer ladder structure that supports in quadrangle structure, the last follow-up cat ladder structure of installing of quadrangle structure, the follow-up cat ladder structure is linked together fixed ladder structure and top layer ladder structure, the head fixed mounting of fixed ladder structure has the interlock that is used for supporting the locking to whole work ladder and pulls detent, install the elevating system who is used for driving top layer ladder structure lift between interlock traction detent and the top layer ladder structure.

The fixed ladder structure comprises a fixed ladder frame, tail wheels are fixedly mounted at the bottom of the fixed ladder frame, a bottom ladder frame is mounted on the side face of the fixed ladder frame, a bottom step plate is mounted between the bottom ladder frame, and first handrails are fixed on the two sides of the bottom ladder frame.

The top layer ladder structure comprises a top layer ladder base plate, a top layer platform is fixed at the top of the top layer ladder base plate, the top layer ladder base plate is connected with the top layer platform through a top layer step plate, a second handrail is arranged on the periphery of the top layer ladder base plate, and a third handrail is arranged on the periphery of the top layer platform.

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 bottom quadrilateral hinged seats, 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 top quadrilateral hinged seats; the first quadrilateral frame and the second quadrilateral frame are arranged in a parallel structure.

The follow-up ladder stand structure comprises pedal fixing frames fixed between first quadrilateral frames of the quadrilateral mechanisms, a follow-up pedal is hinged between the pedal fixing frames, the bottom of the follow-up pedal is hinged and connected with a follow-up pull rod through a follow-up connecting plate, and the top of the follow-up pull rod is fixed at the bottom end of a top ladder bottom plate of the top ladder structure through a pull rod hinge seat; the follow-up pull rod is parallel to the first quadrilateral frame of the quadrilateral mechanism.

The lifting mechanism comprises symmetrically arranged lifting sleeves, the lifting sleeves are fixedly connected through a reinforcing structure, a lifting rod is installed inside each lifting sleeve through sliding fit, a rectangular notch is machined in the middle of each lifting sleeve, a gear is installed at the position of the rectangular notch through a gear installation seat, the gear is installed on a transmission shaft, and the gear is in meshing transmission with a rack machined on the outer wall of the lifting rod and drives the whole lifting rod to lift; the two ends of the transmission shaft are provided with rocker arms, and the other ends of the rocker arms are provided with handles;

a bottom hinged seat is fixed at the bottom of the lifting sleeve; a top hinged seat is fixedly arranged at the top of the lifting rod; the bottom hinged seat is hinged with the top of the linkage type traction stop mechanism, and the top hinged seat is hinged with the bottom end of the top ladder bottom plate of the top ladder structure;

the reinforcing structure comprises a plurality of reinforcing cross rods connected between the lifting sleeves and inclined supporting rods arranged in an inclined mode.

The gear mounting seat on one side is provided with a ratchet and pawl self-locking device, the ratchet and pawl self-locking device comprises a ratchet wheel arranged on a transmission shaft, the ratchet wheel is matched with a pawl, the pawl is hinged on an 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;

the top of the L-shaped mounting plate is fixedly provided with a tension spring connecting plate, the tension spring connecting plate is connected with a tension spring, and the other end of the tension spring is hooked with a tension spring mounting seat fixed on the pawl;

the top processing of lifter has a plurality of round pin shaft holes, run through on the round pin shaft hole and install safe bolt.

The linkage type traction and stop mechanism comprises a framework, a plurality of rotating shaft seats are parallelly installed on one side of the top of the framework, a rotating shaft assembly is rotatably supported on each rotating shaft seat, the middle part of each rotating shaft assembly is fixedly connected with a middle rotating arm for driving the rotating shaft assembly to rotate, the middle rotating arm is connected with a connecting rod mechanism for driving the rotating shaft assembly to rotate, the connecting rod mechanism is connected with a steering arm hinged to the bottom of the framework in a matched mode, the other end of the steering arm is connected with a wheel assembly through a steering pull rod, the wheel assembly is installed on two sides of the framework, and connecting rod braking mechanisms for braking are installed at two ends of each rotating shaft assembly;

the middle rotating arm is fixedly connected with the middle part of the rotating shaft assembly through a rotating arm fixing seat;

the end of the middle rotating arm is inserted with a limit safety bolt for limiting the traction rod;

the steering arm is hinged to the bottom of the framework through a third pin shaft.

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 hinged to the bottom end of the connecting rod through an ear plate, and the top end of the connecting rod is hinged to the middle rotating arm through a pin shaft;

the wheel assembly comprises wheel shaft hinge seats fixed on two outer side walls of the framework, wheels are hinged on the wheel shaft hinge seats, and wheel shafts of the wheels are hinged with the steering pull rod through arc-shaped arms; the steering arm is hinged with the middle part of the steering pull rod through a second pin shaft.

The connecting rod braking mechanism comprises external rotating arms fixed at two ends of the rotating shaft assembly, the other ends of the external rotating arms are hinged to the top of the stopping supporting rod through the double-end hinged plate, the stopping supporting rod is installed inside the stand column through sliding fit, and the stand column is arranged on two sides of the framework.

The utility model discloses there is following beneficial effect:

1. structurally, the ladder stand is divided into a fixed ladder structure and a top ladder structure, and the horizontal parallel follow-up of the follow-up ladder stand structure and the top ladder structure in the ladder lifting process is realized by utilizing the principle that opposite sides of a quadrilateral mechanism are always kept parallel in the movement process.

2. The interlocking type traction stopping mechanism is adopted, a plurality of functions of traction, steering, stopping, supporting and the like of the wheels are integrated together, the stopping support rod is interlocked with the traction rod through the connecting rod mechanism, and the traction rod can achieve retraction and extension interlocking actions of the stopping support rod through the connecting rod mechanism when being unfolded and stored, so that the operation flow is simplified, the unfolding and folding time of the working ladder is shortened, and the working efficiency is improved.

3. The lifting mechanism can be used for lifting actions of the lifting type aircraft maintenance ladder, replaces the traditional pull type lifting mode, improves the convenience of lifting operation, and improves the lifting operation efficiency.

4. Through adopting rack and pinion drive mechanism can be used for driving the lifter to carry out elevating movement in the lifting sleeve inside, and then drives the platform that supports at the lifter top and goes up and down, reaches the purpose of adjusting maintenance height.

5. The ratchet wheel and pawl self-locking device can be used for self-locking, and further ensures that the lifting rod is locked after the height is raised in place.

6. The wheel turns to the department and installs one-way thrust ball bearing and reduces the turning resistance, sets up the oiling mouth and lubricates the oiling of turning part and improves the flexibility of mechanism's motion.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a first perspective three-dimensional view of the present invention.

Fig. 2 is a second perspective three-dimensional view of the present invention.

Fig. 3 is a third perspective three-dimensional view of the present invention.

Fig. 4 is a three-dimensional view of a first viewing angle of the lifting mechanism of the present invention.

Fig. 5 is a second perspective three-dimensional view of the lifting mechanism of the present invention.

Fig. 6 is a three-dimensional view of a third viewing angle of the lifting mechanism of the present invention.

Fig. 7 is a front view of the lifting mechanism of the present invention.

Fig. 8 is a view from a-a in fig. 7 according to the present invention.

Fig. 9 is a first perspective three-dimensional view of the interlocking type traction stop mechanism of the present invention.

Fig. 10 is a second perspective three-dimensional view of the interlocking type traction stop mechanism of the present invention.

Fig. 11 is a third perspective three-dimensional view of the interlocking type traction stop mechanism of the present invention.

Fig. 12 is a state diagram of the interlocking type traction stop mechanism of the present invention in traction.

In the figure: the ladder comprises 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 linkage type traction stop mechanism 6;

a fixed ladder frame 101, tail wheels 102, a bottom-layer ladder climbing frame 103, a bottom-layer step plate 104 and a first handrail 105;

a top ladder bottom plate 301, a top step plate 302, a top platform 303, a third handrail 304 and a second handrail 305;

a first quadrilateral frame 401, a bottom quadrilateral hinged seat 402, a second quadrilateral frame 403 and a top quadrilateral hinged seat 404;

the device comprises a bottom hinged seat 501, a reinforcing cross bar 502, a diagonal brace 503, a lifting sleeve 504, a handle 505, a rocker arm 506, a gear 507, a rectangular notch 508, a gear mounting seat 509, a transmission shaft 510, a safety bolt 511, a bolt shaft hole 512, a lifting rod 513, a top hinged seat 514, a tension spring connecting plate 515, an L-shaped mounting plate 515, a pawl 517, a pin shaft 518, a ratchet 519, a tension spring 520, a tension spring mounting seat 521 and a rack 522;

the traction rod 601, the middle rotating arm 602, the limit safety bolt 603, the rotating shaft assembly 604, the rotating shaft seat 605, the outer rotating arm 606, the double-ended hinge plate 607, the upright column 608, the arc-shaped arm 609, the wheel shaft hinge seat 610, the wheel 611, the stop support rod 612, the connecting rod 613, the first pin 614, the lug plate 615, the third pin 616, the steering arm 617, the second pin 618, the steering pull rod 619, the framework 620 and the rotating arm fixing seat 621.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

Referring to fig. 1-12, a follow-up type airplane maintenance lifting working ladder with a self-locking device comprises a fixed ladder structure 1 positioned at the bottom layer, wherein the top of the fixed ladder structure 1 is hinged with a quadrilateral mechanism 4, the top of the quadrilateral mechanism 4 is hinged with a top layer ladder structure 3, a follow-up ladder structure 2 is installed on the quadrilateral mechanism 4, the fixed ladder structure 1 is communicated with the top layer ladder structure 3 through the follow-up ladder structure 2, a linkage type traction stop mechanism 6 for supporting and stopping the whole working ladder is fixedly installed at the head of the fixed ladder structure 1, and a lifting mechanism 5 for driving the top layer ladder structure 3 to lift is installed between the linkage type traction stop mechanism 6 and the top layer ladder structure 3. By adopting the above structure

Further, fixed ladder structure 1 includes fixed ladder frame 101, the bottom fixed mounting of fixed ladder frame 101 has tailwheel 102, has bottom ladder frame 103 at the side-mounting of fixed ladder frame 101, install bottom step board 104 between bottom ladder frame 103, the both sides of bottom ladder frame 103 are fixed with first handrail 105. The whole ladder stand can be supported by the fixed ladder structure 1.

Further, the top-level ladder structure 3 includes a top-level ladder base plate 301, a top-level platform 303 is fixed on the top of the top-level ladder base plate 301, the top-level ladder base plate 301 and the top-level platform 303 are connected through a top-level step plate 302, a second handrail 305 is arranged on the periphery of the top-level ladder base plate 301, and a third handrail 304 is arranged on the periphery of the top-level platform 303. Can realize going up and down through top ladder structure 3, and then adjust the height of cat ladder.

Further, 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 base 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 base plate 301 of the top ladder structure 3 through a top quadrilateral hinge base 404; the first quadrangular frame 401 and the second quadrangular frame 403 are arranged in a parallel structure. The movable ladder pedal and the working table top can be horizontally and parallelly moved along with the lifting of the ladder by the aid of the principle that opposite sides of the quadrilateral mechanism 4 can be always kept parallel in the movement process.

Further, the follow-up ladder stand structure 2 comprises pedal fixing frames 202 fixed between first quadrilateral frames 401 of the quadrilateral mechanisms 4, follow-up pedals 201 are hinged between the pedal fixing frames 202, the bottoms of the follow-up pedals 201 are hinged and connected with follow-up pull rods 203 through follow-up connecting plates 205, and the tops of the follow-up pull rods 203 are fixed at the bottom ends of top-layer ladder bottom plates 301 of the top-layer ladder structure 3 through pull rod hinge seats 204; the follower link 203 is kept parallel to the first quadrangular frame 401 of the quadrangular mechanism 4. The follow-up ladder structure 2 ensures that the top ladder structure 3 can be kept in a horizontal state all the time in the lifting process.

Further, the lifting mechanism 5 comprises symmetrically arranged lifting sleeves 504, the lifting sleeves 504 are fixedly connected through a reinforcing structure, a lifting rod 513 is installed inside each lifting sleeve 504 through sliding fit, a rectangular notch 508 is processed in the middle of each lifting sleeve 504, a gear 507 is installed at the position of the rectangular notch 508 through a gear installation seat 509, the gear 507 is installed on a transmission shaft 510, the gear 507 is in meshing transmission with a rack 522 processed on the outer wall of the lifting rod 513, and the whole lifting rod 513 is driven to lift; a rocker arm 506 is mounted at two ends of the transmission shaft 510, and a handle 505 is mounted at the other end of the rocker arm 506; the lifting mechanism can be used for lifting actions of the lifting type aircraft maintenance ladder, replaces the traditional pull type lifting mode, improves the convenience of lifting operation, and improves the lifting operation efficiency.

Further, a bottom hinge seat 501 is fixed at the bottom of the lifting sleeve 504; a top hinged seat 514 is fixedly arranged at the top of the lifting rod 513; the bottom hinged seat 501 is hinged with the top of the linked traction stop mechanism 6, and the top hinged seat 514 is hinged with the bottom end of the top ladder bottom plate 301 of the top ladder structure 3; the reinforcing structure comprises a plurality of reinforcing crossbars 502 and obliquely arranged diagonal braces 503 connected between lifting sleeves 504.

Further, a ratchet-pawl self-locking device is mounted on one side gear mounting seat 509 and comprises a ratchet 519 mounted on the transmission shaft 510, the ratchet 519 is matched with a pawl 517, the pawl 517 is hinged to 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; the ratchet wheel and pawl self-locking device is mainly used for locking the transmission shaft 10, so that the height of the lifting rod 13 can be locked after the lifting rod is lifted in place, and the problem that the lifting rod automatically falls down is solved. Thereby ensuring the safety.

Further, a tension spring connecting plate 515 is fixedly installed at the top of the L-shaped installation 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 installation seat 521 fixed to a pawl 517; a plurality of pin shaft holes 512 are processed at the top of the lifting rod 513, and safety pins 511 are installed on the pin shaft holes 512 in a penetrating mode.

Further, the linkage type traction stop mechanism 6 comprises a framework 620, a plurality of rotating shaft seats 605 are installed on one side of the top of the framework 620 in parallel, a rotating shaft assembly 604 is rotatably supported on each rotating shaft seat 605, the middle part of each rotating shaft assembly 604 is fixedly connected with a middle rotating arm 602 for driving the rotating shaft assembly to rotate, each middle rotating arm 602 is connected with a link mechanism for driving the rotating shaft assembly to rotate, each link mechanism is connected with a steering arm 617 hinged to the bottom of the framework 620 in a matched manner, the other end of each steering arm 617 is connected with a wheel assembly through a steering pull rod 619, the wheel assemblies are installed on two sides of the framework 620, and connecting rod brake mechanisms for braking are installed at two ends of each rotating shaft assembly 604; the middle rotating arm 602 is fixedly connected with the middle part of the rotating shaft component 604 through a rotating arm fixing seat 621; the end of the middle rotating arm 602 is inserted with a limit safety bolt 603 for limiting the traction rod 601; the steering arm 617 is hinged to the bottom of the frame 620 via a third pin 616. By adopting the traction and stop mechanism with the structure, a plurality of functions of traction, steering, stopping, supporting and the like of the wheels are integrated together to form a single module which can be integrally disassembled and assembled with the ladder.

Further, the link mechanism comprises a traction rod 601 hinged to the tail of the steering arm 617 through a first pin 614, the bottom end of the traction rod 601 is hinged to the bottom end of a connecting rod 613 through an ear plate 615, and the top end of the connecting rod 613 is hinged to the middle rotating arm 602 through a pin; the link mechanism can be used to drive the rotation of the rotation shaft assembly 604 by the rotation action of the traction rod 601, thereby transmitting torque.

Further, the wheel assembly comprises an axle hinge seat 610 fixed on two outer side walls of the framework 620, wheels 611 are hinged on the axle hinge seat 610, and axles of the wheels 611 are hinged with the steering pull rod 619 through arc-shaped arms 609; the steering arm 617 is pivotally connected to the middle of the steering linkage 619 via a second pin 618. The wheel assembly can support the whole device and can be matched with a tractor to realize the moving and walking of the whole device. When the steering is needed, the steering pull rod 619 is driven through the steering arm 617, and then the arc-shaped arm 609 is driven to rotate around the wheel axle hinge seat 610 through the steering pull rod 619, and then the wheel 611 is driven to realize the steering.

Further, the connecting rod brake mechanism comprises an outer rotating arm 606 fixed at two ends of the rotating shaft assembly 604, the other end of the outer rotating arm 606 is hinged with the top of a stop supporting rod 612 through a double-end hinge plate 607, the stop supporting rod 612 is installed inside a vertical column 608 through sliding fit, and the vertical column 608 is arranged at two sides of the framework 620. The connecting rod brake mechanism can be used for driving the stopping support rod 12 to extend or retract, so that stopping support or normal walking is realized.

The utility model discloses a working process and principle do:

1. the follow-up of the top ladder structure 3 and the follow-up ladder structure 2 is realized by utilizing the principle that opposite sides of the quadrilateral mechanism 4 are always kept parallel in the motion process, and the pedals of the top ladder structure 3 and the follow-up ladder structure 2 can be kept parallel to the ground all the time, so that the safety in the ladder climbing process is ensured.

2. Through will fixing ladder subassembly, the escalator subassembly, the connecting frame piece subassembly, 4 pin joints of parallel articulated frame and upper portion table surface form a positive parallelogram mechanism, realize the follow-up of escalator and upper portion work platform at the lift in-process, when the ladder goes up and down, the escalator, contained angle between parallel articulated frame and the ground can change, but goes up the mesa and can remain parallel with ground throughout.

3. A plurality of positive parallelogram mechanisms are formed among the hinged points of the pedals, the linkage pull rod and the upper working platform of the movable ladder component, so that the pedals in the movable ladder component can follow up in the lifting process of the ladder and can always keep the upper plane of the pedals parallel to the ground.

4. The upper plane of the pedal and the upper working table surface of the movable ladder are passages and working areas for personnel to get on and off the ladder, and the upper plane and the upper working table surface of the movable ladder must be parallel to the ground.

5. When the working ladder is in a working state and a parking state, the traction rod 601 is pulled to rotate upwards for folding and storage, the stop support rod 612 extends downwards through the connecting rod braking mechanism to support the ground, the wheels 611 are about 5-10 mm away from the ground, the stop support effect is achieved, the stability of the working ladder is improved, the limit safety bolt 603 is inserted at the moment, the traction rod is limited to rotate downwards, and the safety protection effect is achieved.

6. When the working ladder is in a traction state, the traction rod 601 is pulled to rotate downwards to be unfolded, the stop support rod 612 retracts upwards through the connecting rod brake mechanism, the wheel 611 lands on the ground to be in contact with the ground, the traction rod can be used for pulling and traction, and the steering of the wheel is realized through the left-right swinging of the traction rod in the traction process and the linkage of the steering pull rod.

7. When lifting operation is needed, the transmission shaft 510 is driven to rotate through the rocker 506 by manually rotating the rocker 506, the gear 507 is driven by the transmission shaft 510, and is meshed with the rack 522 on the side wall of the lifting rod 513 through the gear 507 so as to drive the lifting rod to realize lifting action along the lifting sleeve 504, so that the height of the top maintenance platform is adjusted, and after the height of the top maintenance platform is adjusted in place, the transmission shaft 510 is mainly locked through the ratchet and pawl self-locking device.

Claims (10)

1. The utility model provides a take self-lock device's trailing type aircraft maintenance lift work ladder which characterized in that: it is including being located the fixed ladder structure (1) of bottom, the top of fixed ladder structure (1) articulates there is quadrangle mechanism (4), the articulated support in top layer ladder structure (3) of quadrangle mechanism (4), install follow-up cat ladder structure (2) on quadrangle mechanism (4), follow-up cat ladder structure (2) are linked together fixed ladder structure (1) and top layer ladder structure (3), the head fixed mounting of fixed ladder structure (1) has interlock traction locking mechanism (6) that is used for supporting the locking to whole work ladder, install elevating system (5) that are used for driving top layer ladder structure (3) to go up and down between interlock traction locking mechanism (6) and top layer ladder structure (3).

2. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 1, characterized in that: fixed ladder structure (1) is including fixed ladder frame (101), the bottom fixed mounting of fixed ladder frame (101) has tailwheel (102), has bottom ladder frame (103) at the side-mounting of fixed ladder frame (101), install bottom step board (104) between bottom ladder frame (103), the both sides of bottom ladder frame (103) are fixed with first handrail (105).

3. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 1, characterized in that: top layer ladder structure (3) are including top layer ladder bottom plate (301), the top of top layer ladder bottom plate (301) is fixed with top layer platform (303), link to each other through top layer step board (302) between top layer ladder bottom plate (301) and top layer platform (303), the periphery of top layer ladder bottom plate (301) is provided with second handrail (305), the periphery of top layer platform (303) is provided with third handrail (304).

4. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 1, characterized in that: 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), 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 configuration.

5. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 1, characterized in that: the follow-up ladder stand structure (2) comprises pedal fixing frames (202) fixed between first quadrilateral frames (401) of the quadrilateral mechanism (4), follow-up pedals (201) are hinged between the pedal fixing frames (202), the bottoms of the follow-up pedals (201) are hinged and connected with follow-up pull rods (203) through follow-up connecting plates (205), and the tops of the follow-up pull rods (203) are fixed at the bottom ends of top-layer ladder bottom plates (301) of the top-layer ladder structure (3) through pull rod hinge seats (204); the follow-up pull rod (203) is parallel to a first quadrilateral frame (401) of the quadrilateral mechanism (4).

6. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 1, characterized in that: the lifting mechanism (5) comprises symmetrically arranged lifting sleeves (504), the lifting sleeves (504) are fixedly connected through a reinforcing structure, a lifting rod (513) is installed inside each lifting sleeve (504) through sliding fit, a rectangular notch (508) is machined in the middle of each lifting sleeve (504), a gear (507) is installed at the position of each rectangular notch (508) through a gear installation seat (509), the gear (507) is installed on a transmission shaft (510), and the gear (507) is in meshing transmission with a rack (522) machined on the outer wall of each lifting rod (513) and drives the whole lifting rod (513) to lift; two ends of the transmission shaft (510) are provided with rocker arms (506), and the other ends of the rocker arms (506) are provided with handles (505);

a bottom hinged seat (501) is fixed at the bottom of the lifting sleeve (504); a top hinged seat (514) is fixedly arranged at the top of the lifting rod (513); the bottom hinged seat (501) is hinged with the top of the linkage type traction stopping mechanism (6), and the top hinged seat (514) is hinged with the bottom end of the top ladder bottom plate (301) of the top ladder structure (3);

the reinforcing structure comprises a plurality of reinforcing cross bars (502) connected between lifting sleeves (504) and obliquely arranged diagonal braces (503).

7. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 6, characterized in that: a ratchet wheel and pawl self-locking device is mounted on one side gear mounting seat (509) and comprises a ratchet wheel (519) mounted on a transmission shaft (510), the ratchet wheel (519) is matched with a pawl (517), the pawl (517) is hinged to an L-shaped mounting plate (516) through a pin shaft (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 installed at the top of the L-shaped installing plate (516), a tension spring (520) is connected onto the tension spring connecting plate (515), and the other end of the tension spring (520) is connected with a tension spring installing seat (521) fixed on a pawl (517) in a hooking mode;

a plurality of pin shaft holes (512) are processed at the top of the lifting rod (513), and safety pins (511) penetrate through the pin shaft holes (512).

8. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 1, characterized in that: the linkage type traction stop mechanism (6) comprises a framework (620), a plurality of rotating shaft seats (605) are arranged on one side of the top of the framework (620) in parallel, a rotating shaft assembly (604) is rotatably supported on each rotating shaft seat (605), the middle part of each rotating shaft assembly (604) is fixedly connected with a middle rotating arm (602) for driving the rotating shaft assembly to rotate, each middle rotating arm (602) is connected with a connecting rod mechanism for driving the rotating shaft assembly to rotate, each connecting rod mechanism is connected with a steering arm (617) hinged to the bottom of the framework (620) in a matched mode, the other end of each steering arm (617) is connected with a wheel assembly through a steering pull rod (619), the wheel assemblies are arranged on two sides of the framework (620), and connecting rod braking mechanisms for braking are arranged at two ends of each rotating shaft assembly (604);

the middle rotating arm (602) is fixedly connected with the middle part of the rotating shaft component (604) through a rotating arm fixing seat (621);

the end head of the middle rotating arm (602) is inserted with a limit safety bolt (603) for limiting the traction rod (601);

the steering arm (617) is hinged to the bottom of the framework (620) through a third pin shaft (616).

9. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 8, characterized in that: the connecting rod mechanism comprises a traction rod (601) hinged to the tail of a steering arm (617) through a first pin shaft (614), the bottom end of the traction rod (601) is hinged to the bottom end of a connecting rod (613) through an ear plate (615), and the top end of the connecting rod (613) is hinged to a middle rotating arm (602) through a pin shaft;

the wheel assembly comprises wheel axle hinge seats (610) fixed on two outer side walls of a framework (620), wheels (611) are hinged to the wheel axle hinge seats (610), and wheel axles of the wheels (611) are hinged to a steering pull rod (619) through arc-shaped arms (609); the steering arm (617) is hinged with the middle part of the steering pull rod (619) through a second pin shaft (618).

10. The follow-up type aircraft maintenance lifting working ladder with the self-locking device according to claim 8, characterized in that: the connecting rod braking 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 hinged with the top of a stop supporting rod (612) through a double-head hinge plate (607), the stop supporting rod (612) is installed inside a vertical column (608) in a sliding fit mode, and the vertical column (608) is arranged on two sides of the framework (620).

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