CN113335549A

CN113335549A - Lifting mechanism of passenger boarding ladder

Info

Publication number: CN113335549A
Application number: CN202110743466.0A
Authority: CN
Inventors: 文民青; 王鹏; 徐中亚
Original assignee: Hubei Hanggang Technology Co ltd
Current assignee: Hubei Hanggang Technology Co ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2021-09-03

Abstract

The invention provides a lifting mechanism of a passenger boarding ladder, belonging to the technical field of boarding ladders. The boarding ladder solves the technical problems of poor adjustability and reliability and the like. The passenger boarding ladder comprises a chassis and a support frame which is obliquely arranged upwards, wherein the lower end of the support frame is hinged on the chassis, the lifting mechanism comprises a telescopic rod, a first telescopic part and a second telescopic part, a first connecting seat is hinged on the chassis, a second connecting seat is hinged on the lower side of the upper end of the support frame, and the first telescopic part and the telescopic rod are positioned between the first connecting seat and the second connecting seat; the telescopic link includes dead lever and carriage release lever, and open one side of carriage release lever has the ratchet that the several set up along its length direction interval, is connected with the pawl that one end can imbed in the ratchet and the flexible piece two can drive the one end in the pawl embedding ratchet and swing around its other end to breaking away from this ratchet on the dead lever. The lifting mechanism is stable and reliable, low in cost and high in safety.

Description

Lifting mechanism of passenger boarding ladder

Technical Field

The invention belongs to the technical field of aviation mechanical equipment, relates to a passenger boarding ladder, and particularly relates to a lifting mechanism of the passenger boarding ladder.

Background

An airstair is a ladder which connects the ground and a cabin door of an airplane for passengers, crew members, ground service personnel, maintenance personnel and the like to get on and off the airplane. The passenger boarding ladder usually uses a lifting mechanism to adjust the height of the passenger boarding ladder, the common lifting structure at present only uses two oil cylinders to carry out micro-lifting and micro-lowering of the height, when the passenger boarding ladder is micro-lifted, oil is pumped into the two oil cylinders by a pump station, when the passenger boarding ladder is micro-lowered, the self-weight of the upper part of the passenger boarding ladder is used for returning hydraulic oil pressure in the oil cylinders to an oil tank, thus a problem is generated, when the lifting mechanism is micro-lifted or micro-lowered to a certain height needing to be fixed, a hydraulic lock is generally used at an oil inlet to lock the hydraulic oil by a control system so as to lead the hydraulic pipe connected with the hydraulic lock to burst, thus an explosion-proof valve is required to be added behind the hydraulic lock, and the result is that the function of simply enabling the oil cylinders to be fixed in the descending process is realized, two expensive, complex and potentially dangerous components must be used.

Chinese patent (publication number: CN 210734522U; publication date: 2020-06-12) discloses a civil aviation passenger boarding ladder, which comprises a bottom frame, a step ladder, a butt joint platform and a supporting section bar for supporting the step ladder and the butt joint platform; the supporting section bar is arranged on the bottom frame; the bottom layer of the step ladder is connected with the bottom frame, and the top layer of the step ladder is connected with the butt-joint platform; a plurality of trundles used for moving the airstairs are arranged on the bottom frame; the bottom frame is also provided with a plurality of foot supports for fixing the position of the airstairs; the bottom frame, the step ladder, the butt-joint platform and the supporting section bar are all made of aviation aluminum sections.

The civil aviation passenger boarding ladder disclosed in the above patent document does not disclose a lifting mechanism, and is poor in adjustability and versatility.

Disclosure of Invention

The invention provides a lifting mechanism of a passenger boarding ladder aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to improve the adjustability of the airstairs and avoid the danger that the hydraulic lock is out of work or leaked, and reduce the cost thereof.

The purpose of the invention can be realized by the following technical scheme:

a lifting mechanism of a passenger boarding ladder comprises a chassis and a support frame which is arranged obliquely upwards, wherein the lower end of the support frame is hinged to the chassis; the telescopic link includes dead lever and carriage release lever, the one end of dead lever is fixed on the connecting seat one and other end middle part opens there is the confession the mounting hole that the carriage release lever wore to establish, the one end of carriage release lever is worn out the mounting hole just articulates on the connecting seat two, extensible member one can drive connecting seat two drives the carriage release lever is in the length direction of fixed lever removes, open one side of carriage release lever has the several to follow the ratchet that its length direction interval set up, be connected with on the dead lever one end can imbed pawl in the ratchet just extensible member two can drive the pawl imbeds the one end in the ratchet swings to breaking away from this ratchet around its other end.

The working principle is as follows: the escalator is arranged on the supporting frame in the technical scheme, and the supporting frame can be driven to swing around a hinge point between the supporting frame and the chassis through the lifting mechanism, so that the height between the upper end of the escalator and the ground is adjusted. Particularly, the length of the telescopic rod can be changed by controlling the telescopic piece so as to drive the support frame to swing, the technical scheme is that a ratchet and pawl structure is arranged in the telescopic rod, and when the support frame needs to be fixed at a certain position, the ratchet and the pawl are matched, clamped and supported, so that the pawl supports a sawtooth surface of the ratchet no matter the lifting mechanism is micro-lifted or micro-lowered to a certain height, the telescopic piece cannot move up and down once, the mechanical fixing mode is adopted, the mechanism is simple and reliable in action, two complex parts of a hydraulic lock and an explosion-proof valve are omitted, the oil leakage of an oil cylinder cannot occur, and the explosion-proof valve cannot be used; the danger that the hydraulic lock may be out of work or leaked is avoided, the cost is lower, and the safety is higher.

In the lifting mechanism of the passenger boarding ladder, the number of the first telescopic parts and the number of the telescopic rods are two, the number of the first telescopic parts and the number of the two telescopic rods are respectively arranged between the first connecting seat and the second connecting seat at intervals side by side, a connecting plate is fixedly arranged between the two fixing rods, a mounting seat is fixedly arranged at the position, corresponding to the two fixing rods, on the connecting plate, an open slot for embedding one end of the pawl is formed in the mounting seat, a rotating shaft is arranged between the two mounting seats, the two ends of the rotating shaft are fixedly connected with one end, located in the open slot, of the pawl respectively, a fixing ring is sleeved on the rotating shaft, a shell of the second telescopic parts is fixed on the connecting plate, and the output end of the shell of the second telescopic parts is hinged to one side of the fixing ring.

In the lifting mechanism of the passenger boarding ladder, the guide plate along the length direction of the telescopic rod is fixedly arranged on the second connecting seat, two limiting seats which are arranged at intervals are fixedly arranged on one side of the connecting plate, limiting grooves for embedding one side of the guide plate are formed in the opposite side faces of the two limiting seats, and an extending part which inclines outwards is arranged at one end, far away from the second connecting seat, of the guide plate.

In the lifting mechanism of the passenger boarding ladder, the first telescopic piece is a cylinder, a hydraulic cylinder or an electric push rod; the second telescopic part is an electromagnet, an air cylinder, a hydraulic cylinder or an electric push rod.

Preferably, the first telescopic part is a hydraulic oil cylinder, and the second telescopic part is an electromagnet. And an output shaft of the second telescopic piece is sleeved with a return spring.

When the lifting mechanism is lifted up through the hydraulic oil cylinder, the pawl always props against the sawtooth surface of the ratchet under the action of the return spring at the top of the electromagnet, so that the lifting mechanism is fixed at a certain height, when the lifting mechanism is slightly lowered, the electromagnet is electrified to act, the output shaft of the electromagnet pushes the rotating shaft to rotate, the pawl is rotated to be separated from the sawtooth surface of the ratchet, so that the lifting mechanism is slightly lowered, when the lifting mechanism descends to a certain height, the electromagnet is powered off, the pawl can be rotationally pulled back to be propped against the sawtooth surface of the ratchet under the action of the return spring, thus the lifting oil cylinder is fixed at a certain height, the pawl-ratchet mechanism has simple and reliable action and high stability, and under the fixed action of connecting plate, can form a stable rectangle stable structure, make hydraulic cylinder and telescopic link stable can not rock.

In the lifting mechanism of the passenger boarding ladder, the telescopic rod and the telescopic piece are arranged in an inclined way in the same direction; an obtuse triangle structure is formed among the telescopic rod, the supporting frame and the chassis. The obtuse triangle structure has high stability, and improves the safety and the bearing capacity of the passenger boarding ladder when in use.

Compared with the prior art, the invention has the following advantages:

1. the invention can adjust the height of the airstairs by utilizing the first telescopic piece, thereby leading the airstairs to be adapted to more machine types, expanding the application range of the airstairs and improving the universality of the airstairs.

2. The telescopic rod, the chassis and the support frame form an obtuse triangle structure, so that the stability and the bearing capacity of the passenger boarding ladder are improved.

3. The lifting mechanism of the invention ascends or descends to a certain height, and is fixed only by a pawl and ratchet mechanical structure with simple structure, thus saving a hydraulic lock and an explosion-proof valve, and having simple structure, low cost and safe and reliable use.

Drawings

Fig. 1 is a schematic perspective view of a passenger boarding ladder.

Fig. 2 is a first structural schematic diagram of the lifting mechanism.

Fig. 3 is a second schematic structural view of the lifting mechanism.

Fig. 4 is a partially enlarged schematic view of a portion a in fig. 3.

In the figure, 1, a chassis; 2. an escalator; 3. a support frame; 41. a telescopic rod; 41a, a fixing rod; 41a1, mounting holes; 41b, a moving rod; 41b1, ratchet; 42. a first telescopic part; 43. a second telescopic part; 44. a first connecting seat; 45. a second connecting seat; 46. a pawl; 47. a connecting plate; 48. a mounting seat; 48a, an open slot; 49. a rotating shaft; 49a, a fixing ring; 5. a guide plate; 5a, an extension part; 6. a limiting seat; 6a and a limiting groove.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2 and 3, the passenger boarding ladder in this embodiment includes a chassis 1, an escalator 2 and a support frame 3 disposed obliquely upward, the lower end of the support frame 3 is hinged on the chassis, the lifting mechanism includes a telescopic rod 41, a first telescopic member 42 and a second telescopic member 43, the chassis 1 is hinged with a first connecting seat 44, the lower side of the upper end of the support frame 3 is hinged with a second connecting seat 45, and the first telescopic member 42 and the telescopic rod 41 are located between the first connecting seat 44 and the second connecting seat 45; the telescopic rod 41 comprises a fixed rod 41a and a movable rod 41b, one end of the fixed rod 41a is fixed on a first connecting seat 44, a mounting hole 41a1 for the movable rod 41b to penetrate through is formed in the middle of the other end of the fixed rod 41a, one end of the movable rod 41b penetrates through the mounting hole 41a1 and is hinged to a second connecting seat 45, a first telescopic piece 42 can drive the second connecting seat 45 to drive the movable rod 41b to move in the length direction of the fixed rod 41a, a plurality of ratchets 41b1 arranged at intervals in the length direction are formed in one side of the movable rod 41b, a pawl 46 with one end capable of being embedded into the ratchets 41b1 is connected to the fixed rod 41a, and one end of the second telescopic piece 3543 capable of driving the pawl 46 to be embedded into the ratchets 41b1 and swing around the other end to be separated from the ratchets 41b 1.

Set up staircase 2 on support frame 3, can drive support frame 3 through this lifting mechanism around its and the chassis between the pin joint swing to adjust the height between 2 upper ends of staircase to ground. Particularly, the length of the telescopic rod 41 can be changed by operating the first telescopic part 42 so as to drive the support frame 3 to swing, the structure of the ratchet 41b1 and the pawl 46 is arranged in the telescopic rod 41, when the support frame 3 needs to be fixed at a certain position, the ratchet 41b1 and the pawl 46 are matched, clamped and supported, so that the pawl 46 supports the sawtooth surface of the ratchet 41b1 no matter the lifting mechanism is micro-lifted or micro-lowered to a certain height, so that the first telescopic part 42 cannot move up and down, the mechanical fixing is adopted, the mechanism is simple and reliable in action, two complex parts of a hydraulic lock and an explosion-proof valve are omitted, the oil leakage condition of an oil cylinder cannot occur, and the explosion-proof valve cannot be used; the danger that the hydraulic lock may be out of work or leaked is avoided, the cost is lower, and the safety is higher.

Further, as shown in fig. 2 and 3, the number of the first telescopic parts 42 and the number of the telescopic rods 41 are two, the first telescopic parts 42 and the two telescopic rods 41 are arranged between the first connecting seat 44 and the second connecting seat 45 at intervals side by side, a connecting plate 47 is fixedly arranged between the two fixing rods 41a, a mounting seat 48 is fixedly arranged on the connecting plate 47 at a position corresponding to the two fixing rods 41a, an open slot 48a for embedding one end of a pawl 46 is formed in the mounting seat 48, a rotating shaft 49 is arranged between the two mounting seats 48, two ends of the rotating shaft 49 are fixedly connected with one end of the two pawls 46 located in the open slot 48a, a fixing ring 49a is sleeved on the rotating shaft 49, a shell of the second telescopic part 43 is fixed on the connecting plate 47, and an output end of the shell is hinged to one side of the fixing ring 49 a.

Referring to fig. 4, the second connecting seat 45 is fixedly provided with a guide plate 5 along the length direction of the telescopic rod 41, one side of the connecting plate 47 is fixedly provided with two limiting seats 6 arranged at opposite intervals, the opposite side surfaces of the two limiting seats 6 are respectively provided with a limiting groove 6a for embedding one side of the guide plate 5, and one end of the guide plate 5, which is far away from the second connecting seat 45, is provided with an extending portion 5a inclined outwards.

In this embodiment, the first telescopic part 42 is a cylinder, a hydraulic cylinder or an electric push rod; the second telescopic part 43 is an electromagnet, an air cylinder, a hydraulic cylinder or an electric push rod. Preferably, the first telescoping piece 42 is a hydraulic cylinder and the second telescoping piece 43 is an electromagnet. And a return spring is sleeved on an output shaft of the second telescopic piece 42. When the lifting mechanism is used for lifting by the hydraulic oil cylinder, the pawl 46 can always prop the pawl 46 against the sawtooth surface of the ratchet 41b1 under the action of the return spring at the top of the electromagnet, so that the lifting mechanism is fixed at a certain height, when the lifting mechanism descends slightly, the electromagnet is electrified to act, the output shaft of the electromagnet pushes the rotating shaft 49 to rotate, the pawl 46 is rotated to be separated from the sawtooth surface of the ratchet 41b1, and then the lifting mechanism descends slightly, when the lifting mechanism is lowered to a certain height, the electromagnet is de-energized, the pawl 46 will rotate under the action of the return spring to pull the pawl 46 back to abut against the sawtooth surface of the ratchet teeth 41b1, thus the lifting oil cylinder is fixed at a certain height, the pawl-ratchet mechanism has simple and reliable action and high stability, and under the fixed action of connecting plate 47, can form a stable rectangle stable structure, make hydraulic cylinder and telescopic link 41 stable can not rock.

As shown in fig. 1, in the present embodiment, the telescopic rod 41 and the first telescopic member 42 are obliquely arranged in the same direction; an obtuse triangle structure is formed among the telescopic rod 41, the supporting frame 3 and the chassis 1. The obtuse triangle structure has high stability, and improves the safety and the bearing capacity of the passenger boarding ladder when in use.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A lifting mechanism of a passenger boarding ladder comprises a chassis (1) and a support frame (3) which is obliquely arranged upwards, wherein the lower end of the support frame (3) is hinged to the chassis (1), and is characterized in that the lifting mechanism comprises a telescopic rod (41), a first telescopic piece (42) and a second telescopic piece (43), a first connecting seat (44) is hinged to the chassis (1), a second connecting seat (45) is hinged to the lower side of the upper end of the support frame (3), and the first telescopic piece (42) and the telescopic rod (41) are located between the first connecting seat (44) and the second connecting seat (45); the telescopic rod (41) comprises a fixed rod (41a) and a movable rod (41b), one end of the fixed rod (41a) is fixed on the first connecting seat (44), the middle part of the other end of the fixed rod (41a) is provided with a mounting hole (41a1) for the movable rod (41b) to penetrate through, one end of the moving rod (41b) penetrates through the mounting hole (41a1) and is hinged on the connecting seat II (45), the first telescopic part (42) can drive the second connecting seat (45) to drive the movable rod (41b) to move in the length direction of the fixed rod (41a), one side of the moving rod (41b) is provided with a plurality of ratchets (41b1) arranged at intervals along the length direction, the fixed rod (41a) is connected with a pawl (46) with one end capable of being embedded into the ratchet (41b1), and the second telescopic piece (43) can drive one end, embedded into the ratchet (41b1), of the pawl (46) to swing around the other end of the pawl to be separated from the ratchet (41b 1).

2. The lifting mechanism of a passenger boarding ladder according to claim 1, wherein the number of the first telescopic member (42) and the number of the telescopic rods (41) are two, the two first telescopic members (42) and the two telescopic rods (41) are arranged between the first connecting seat (44) and the second connecting seat (45) side by side at intervals, a connecting plate (47) is fixedly arranged between the two fixing rods (41a), a mounting seat (48) is fixedly arranged on the connecting plate (47) at a position corresponding to the two fixing rods (41a), an open slot (48a) for embedding one end of the pawl (46) is formed in the mounting seat (48), a rotating shaft (49) is arranged between the two mounting seats (48), and two ends of the rotating shaft (49) are fixedly connected with one ends of the two pawls (46) positioned in the open slot (48a) respectively, the cover is equipped with solid fixed ring (49a) on pivot (49), the casing of extensible member two (43) is fixed on connecting plate (47) and the output with one side of solid fixed ring (49a) is articulated mutually.

3. The lifting mechanism of a passenger boarding ladder according to claim 2, characterized in that a guide plate (5) along the length direction of the telescopic rod (41) is fixedly arranged on the second connecting seat (45), two limiting seats (6) arranged oppositely at intervals are fixedly arranged on one side of the connecting plate (47), limiting grooves (6a) for embedding one side of the guide plate (5) are respectively formed on the opposite side surfaces of the two limiting seats (6), and one end of the guide plate (5) far away from the second connecting seat (45) is provided with an extending part (5a) which inclines outwards.

4. Lifting mechanism for a passenger escalator as claimed in claim 1, 2 or 3, characterized in that the first telescopic part (42) is a pneumatic cylinder, a hydraulic cylinder or an electric push rod; the second telescopic part (43) is an electromagnet, an air cylinder, a hydraulic cylinder or an electric push rod; and an output shaft of the second telescopic part (43) is provided with a return spring.

5. Lifting mechanism for a passenger ramp according to claim 1, 2 or 3, characterised in that the telescopic rod (41) and the first telescopic part (42) are arranged obliquely in the same direction; an obtuse triangle structure is formed among the telescopic rod (41), the supporting frame (3) and the chassis (1).