CN217918477U

CN217918477U - Ratchet pawl type locking mechanism for central column double-support rod of passenger boarding ladder

Info

Publication number: CN217918477U
Application number: CN202222178780.1U
Authority: CN
Inventors: 镡永宝; 何彪; 陈保林
Original assignee: Chongqing Dahang Industry Co ltd
Current assignee: Chongqing Dahang Industry Co ltd
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2022-11-29
Anticipated expiration: 2032-08-18

Abstract

The utility model discloses a ratchet pawl type locking mechanism with double support rods and ratchet pawls for a center post of a passenger boarding ladder, which comprises two racks respectively forming a telescopic rod in two support rods, wherein the racks are engaged with gears; the two gears are coaxially fixed on the locking shaft, the locking shaft is also fixedly connected with a ratchet wheel, and the ratchet wheel is engaged with a pawl; the pawl is in a multi-tooth structure with at least two teeth; the diameter of the ratchet wheel is larger than or equal to the diameter of the gear. The beneficial effects of the utility model are that, in the airstairs for having two bracing pieces, the telescopic link of two bracing pieces is by the synchronous lift of same lift cylinder drive, and two telescopic links all can be in the optional position locking, consequently, can not cause two bracing pieces height nonconformities. And the locking distance is reduced to 1/4 of the locking mechanism of the existing pawl cylinder through reasonable parameter design.

Description

Ratchet pawl type locking mechanism for double-support-rod ratchet of center column of passenger boarding ladder

Technical Field

The utility model relates to a passenger's airstair, especially one kind is used for passenger's airstair center pillar dual bracing piece ratchet pawl formula locking mechanism.

Background

The passenger stairway is mainly used in the situation that no boarding bridge is available as airport facility, and is generally in a telescopic structure and is arranged on a vehicle chassis to form a boarding vehicle. In order to ensure the passing performance and the running safety of the vehicle in an airport, the tail end of a fixed ladder of the airstair is hinged on the floor of the vehicle, and the front end of the fixed ladder is connected with a bottom plate through an oil cylinder type center pillar supporting rod. During running, the oil cylinder retracts, and the front end of the oil cylinder is lowered to the limit position. When passengers get on or off, the oil cylinder extends out to lift the front end and then is butted with the door of the airplane, and the center pillar support rod substantially forms a pitching adjusting mechanism of the airstairs. In order to ensure the rigidity of the airstairs in any pitching state, a locking mechanism is usually required to lock the center pillar support rod. The existing locking mechanism comprises a ratchet arranged on an expansion link, a pawl which penetrates through a pipe column of a support rod and is meshed with the ratchet, and the pawl is arranged on an oil cylinder to form a pawl cylinder so as to be locked through the pawl cylinder. However, the existing center pillar usually comprises two support rods, the two support rods are locked by two pawl cylinders respectively, and because the space between adjacent pawl teeth on the same ratchet bar is based on the modulus, if a small height difference exists between the two ratchet bars, the locking height between the two ratchet bars is easy to cause the staggered tooth phenomenon of a space between the two ratchet bars, so that the heights of the two sides of the front platform of the ladder body are inconsistent, and potential safety hazards exist. For this reason, improvements are required.

Disclosure of Invention

The utility model aims at providing a locking mechanism based on ratchet jar locking to the center pillar double bracing piece of current passenger airstair, be difficult to reach the not enough of high uniformity, provide a locking mechanism for passenger airstair center pillar double bracing piece ratchet pawl formula, with fix on same root locking epaxial through two ratchet axles, and implement the locking by a ratchet pawl, utilize the characteristics that the rack can stop optional position in gear and the rack toothing, make the locking altitude variation only depend on the ratchet pawl parameter, thereby realize the synchronous locking of telescopic link in the two spinal branch vaulting poles, the wrong tooth phenomenon that current pawl jar locking mechanism appears easily has been eliminated, make ladder body front platform both sides highly uniform, ensure safe in utilization.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

A ratchet pawl type locking mechanism for a double-support-rod ratchet wheel of a center column of a passenger boarding ladder comprises two racks respectively forming a telescopic rod in two support rods, wherein the racks are meshed with gears; the two gears are coaxially fixed on the locking shaft, the locking shaft is also fixedly connected with a ratchet wheel, and the ratchet wheel is engaged with a pawl; the pawl is of a multi-tooth structure with at least two teeth; the diameter of the ratchet wheel is larger than or equal to the diameter of the gear.

The ratchet and pawl type locking mechanism adopting the technical scheme is used for locking the pitching state adjustment of the airstairs. Wherein, the airstair center pillar is two bracing piece structures, and every bracing piece comprises tubular column and telescopic link, and the telescopic link is the rack structure. The telescopic rod is driven by the lifting driving component to synchronously lift and drive the gear to rotate based on the meshing of the gear and the rack. The ratchet pawl type locking structure can prevent the ratchet, the locking shaft and the gear from rotating through the pawl based on the one-way principle, so that a locking state is formed, the telescopic rod is prevented from accidentally slipping, and the boarding ladder can be prevented from being accidentally pitched. In an unlocking or locking state, the telescopic rod can move upwards based on the one-way principle of the ratchet wheel and the pawl, and the pawl forms locking on the ratchet wheel when the telescopic rod moves to the next locking height and stops. Because two ratchet wheels of the mechanism are coaxially fixed on the same locking shaft and locked by a ratchet wheel pawl, the characteristic that a rack can stay at any position in the meshing of a gear and a rack is utilized, so that the locking height change only depends on the ratchet wheel pawl parameters, the synchronous locking of the telescopic rods in two support rods is realized, the staggered tooth phenomenon easily occurring in the conventional pawl cylinder locking mechanism is eliminated, the heights of two sides of a front platform of a ladder body are consistent, and the use safety is ensured. In addition, the pawl is of a multi-tooth structure with at least two teeth, and can form a multi-tooth simultaneous meshing structure with the ratchet wheel, so that the locking force is dispersed on a plurality of teeth, the modulus of the ratchet wheel can be reduced, the number of teeth of the ratchet wheel can be increased under the same locking load condition, and the distance between adjacent locking positions can be effectively reduced; meanwhile, the diameter of the ratchet wheel is larger than or equal to the diameter of the gear, the number of the teeth of the ratchet wheel can be correspondingly increased, the phase angle corresponding to each ratchet wheel is reduced, when each ratchet wheel rotates one tooth, the rotation angle of the locking gear is correspondingly reduced, and the distance between the adjacent locking positions is further reduced. Wherein, the diameters of the ratchet wheel and the gear wheel are both referred to as reference circle diameter or nominal diameter.

Preferably, the diameter of the ratchet wheel is 1.5 to 2.5 times of the diameter of the gear. Further ensuring a small locking pitch.

Further preferably, the diameter of the ratchet wheel is 1.8 times of the diameter of the gear; the pawl is of a three-tooth structure. The problem of large space requirement caused by overlarge ratchet wheel is avoided, and the integral layout is facilitated. And through reasonable parameter design, compared with the locking mode of the existing pawl cylinder, the locking distance can be reduced to 1/4 of the original locking distance.

Preferably, a first tension spring for keeping the locking is connected to the pawl. To ensure one-way automatic locking.

Further preferably, an electrically controlled unlocking drive member is connected to the pawl. So as to realize unlocking through electric control, and the telescopic rod can be smoothly retracted. The electric control unlocking driving component comprises an oil cylinder based on an electric control oil path and an electric cylinder or an electric push rod based on electric drive, wherein the electric push rod is also called a linear driver, and is a novel linear actuating mechanism mainly composed of a motor push rod, a control device and other mechanisms, and the electric cylinder or the electric push rod can be considered as an extension of the rotating motor in the aspect of structure. The electric cylinder is a modularized product which integrates a servo motor and a lead screw, converts the rotary motion of the servo motor into linear motion, simultaneously converts the best advantages of the servo motor, namely accurate rotating speed control, accurate revolution control and accurate torque control into accurate speed control, accurate position control and accurate thrust control, and realizes a brand new revolutionary product of a high-precision linear motion series. The electric push rod is relatively low in cost.

Still further preferably, a second tension spring is arranged between the electrically controlled unlocking driving member and the pawl. The unlocking driving member and the pawl form soft connection, and the phenomenon that the hard connection is blocked to cause overload damage of the electronic control unlocking driving member is avoided.

The beneficial effects of the utility model are that, in the airstairs for having two bracing pieces, the telescopic link of two bracing pieces is by the synchronous lift of same lift cylinder drive, and two telescopic links all can be in the optional position locking, have eliminated the easy wrong tooth phenomenon that appears of current pawl jar locking mechanism, make ladder body front platform both sides highly uniform, ensure safe in utilization. And the locking distance is reduced to 1/4 of that of the existing pawl cylinder locking mechanism through reasonable parameter design.

Drawings

Fig. 1 is a schematic perspective view of the structure of the present invention.

Fig. 2 is a schematic front view of another view angle of the present invention.

Fig. 3 is a schematic side view of the structure of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the scope of the embodiments described herein.

Referring to fig. 1, 2 and 3, a center pillar of a passenger boarding ladder comprises a center pillar outrigger 9 driven to lift by a pitch adjusting cylinder 12, wherein center pillar support rods are arranged at two ends of the center pillar outrigger 9, each center pillar support rod comprises a pipe column 10 and a lifting telescopic rod positioned in the pipe column 10, and the telescopic rod is connected with the center pillar outrigger 9; the pipe columns 10 are fixedly connected together by a connecting frame 11. The locking mechanism comprises two racks 1 which respectively form telescopic rods in two support rods, and the racks 1 are engaged with a gear 2; the two gears 2 are coaxially fixed on the locking shaft 3, the locking shaft 3 is also fixedly connected with a ratchet wheel 4, and the ratchet wheel 4 is meshed with a pawl 5; the pawl 5 is of a multi-tooth structure with at least two teeth; the diameter of the ratchet wheel 4 is larger than or equal to that of the gear 2.

Wherein, the diameter D of the ratchet wheel 4 is 1.8 times of the diameter D of the gear 2; the pawl 5 is in a three-tooth structure. A first tension spring 6 for keeping locking is connected with the pawl 5. The pawl 5 is connected with an electric control unlocking driving component 7 formed by an electric push rod. A second tension spring 8 is arranged between the electric control unlocking driving component 7 and the pawl 5. The electric control unlocking driving component 7 is arranged through a mounting bracket fixed on the connecting frame 11; one end of a first tension spring 6 is connected with the pawl 5, and the other end is connected with a connecting frame 11

In this embodiment, the locking shaft 3 is rotatably provided on bearing blocks 13 at both ends, and the bearing blocks 13 are detachably and fixedly connected to the pipe column 10 by screws through connecting lugs.

In this embodiment, the pawl 5 is rotatably disposed on a pawl seat 15 through a pawl shaft 14, the pawl seat 15 is fixedly connected to one of the columns 10, and a limit stop 16 is further disposed on the pawl seat 15, wherein the limit stop 16 is used for limiting a limit angle of deflection of the pawl 5 in an unlocking state so as to prevent the unlocking position from excessively affecting automatic locking.

In this embodiment, the electrically controlled unlocking driving member 7 may be constituted by an oil cylinder based on an electrically controlled oil path, or may be constituted by an electric cylinder based on electric driving.

In the present embodiment, the diameter D of the ratchet 4 may be 1.8 times or more other than 1.5 to 2.5 times the diameter D of the gear 2.

In the present embodiment, the number of teeth of the pawl 3 may be two, four, or five.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A ratchet pawl type locking mechanism for a double-support-rod ratchet wheel of a center column of a passenger boarding ladder is characterized by comprising two racks (1) which respectively form telescopic rods in two support rods, wherein the racks (1) are engaged with gears (2); the two gears (2) are coaxially fixed on the locking shaft (3), the locking shaft (3) is also fixedly connected with a ratchet wheel (4), and the ratchet wheel (4) is engaged with a pawl (5); the pawl (5) is of a multi-tooth structure with at least two teeth; the diameter of the ratchet wheel (4) is larger than or equal to that of the gear (2).

2. The double support rod ratchet pawl type locking mechanism for a center pillar of a passenger boarding ladder according to claim 1, characterized in that the diameter of the ratchet (4) is 1.5-2.5 times the diameter of the gear (2).

3. The mechanism of claim 2, wherein the diameter of the ratchet wheel (4) is 1.8 times the diameter of the gear (2); the pawl (5) is of a three-tooth structure.

4. The mechanism of any one of claims 1 to 3, wherein a first tension spring (6) for keeping locking is connected to the pawl (5).

5. The locking mechanism of the ratchet pawl type for the double support rods in the passenger escalator as claimed in claim 4, characterized in that an electrically controlled unlocking drive member (7) is connected to the pawl (5).

6. The locking mechanism of the ratchet pawl type for the double support rods in the passenger boarding ladder according to claim 5, characterized in that the unlocking driving member (7) is constituted by an electric push rod.

7. The mechanism of claim 5, characterized in that a second tension spring (8) is provided between the electrically controlled unlocking driving means (7) and the pawl (5).