CN217783389U

CN217783389U - Movable platform ladder

Info

Publication number: CN217783389U
Application number: CN202221530513.XU
Authority: CN
Inventors: 姜文革; 陈昭; 高立新; 张成松; 杜炜; 王军
Original assignee: Capital Airport Group Equipment Operation And Maintenance Management Co ltd
Current assignee: Capital Airport Group Equipment Operation And Maintenance Management Co ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-11-11
Anticipated expiration: 2032-06-16

Abstract

A movable platform ladder comprises guardrails, a working platform, a steel wire rope, a front frame, trundles, a bottom frame, a winding device and ladder frames, wherein the guardrails are positioned on two sides of the working platform; the front frame is positioned between the working platform and the bottom frame; the caster wheels are fixedly arranged on the bottom frame and the front frame; the hoisting device is fixed on the front frame and is connected with the guardrail through the steel wire rope; the ladder frame is connected between the working platform and the underframe. The utility model discloses a movable platform ladder adopts hoisting device and wire rope to promote and descend the guardrail, avoids the risk that the latent personnel that no protection state high altitude construction brought fall, greatly alleviates personnel's intensity of labour, effectively reduces the emergence of dangerous incident, promotes platform ladder's anti ability of turning on one's side under the circumstances such as turn, promotes the antitorque ability of self, promotes platform ladder's stability, and convenient operation reliability is high.

Description

Movable platform ladder

Technical Field

The utility model relates to an airport especially relates to a movable platform ladder for aircraft provides unpowered mechanical equipment field under machine of service.

Background

A movable platform ladder (hereinafter referred to as a platform ladder) for an airport is under-aircraft unpowered equipment which provides an up-down channel and an operation platform for ground service personnel to get on and off the aircraft for operation and maintenance. The platform ladder comprises a caster, a universal wheel, a ladder, a working platform, a guardrail, a handrail, a supporting leg, a towing rod and the like; can be pushed or dragged by the drive arrangement at the platform ladder aversion in-process by personnel, require reliably to lock the truckle after arriving the operating position or parking position, the guardrail erects to put in place or places the minimum, and the landing leg rises and ensures that the universal wheel leaves ground, ensures that the work ladder does not take place to shift and avoids taking place personnel's injury or equipment damage incident and take place. The guardrail is required to be placed at a height not higher than the working platform when the airport platform ladder is in a non-working state, and is erected to a normal height position to protect the safety of personnel when in a working state; after the platform ladder is erected in place, the trundles are required to be reliably braked or locked, and the universal wheels in charge of steering are required to be away from the ground, so that the platform ladder is prevented from unexpected displacement in an operating state or a non-working placing state, and an aircraft collision event or personnel injury is prevented; traction can be carried out by using a traction vehicle for improving efficiency during long-distance transition, and particularly, the traction speed needs to be limited on a turning road to prevent a platform ladder from overturning.

At present, the structure of the platform ladder for the airport has the following problems:

1. problem of guard rail: generally, the guardrail is fixed or turnover, the fixed guardrail is not in accordance with the field use requirement in certain occasions, the turnover guardrail can meet the requirement that the guardrail is placed at the height of a working platform under the non-working state, but the personnel needing to be dressed before the operation need to climb on the working platform at the high position to overturn the guardrail with larger weight to the working state for locking, the personnel are in the high-altitude operation in the turnover process and are in the non-protection state, and the guardrail has great potential safety hazard due to the fact that the labor intensity of the personnel is large due to the great weight.

2. The problem of caster braking is that: the platform ladder is not provided with a brake device or a locking device, even if the brake device is limited by the structural form, the brake is unreliable, and the purpose of reliable brake cannot be really realized, so that under the conditions of extreme windy weather and unexpected external force interference, the platform ladder is unexpectedly moved to cause personnel injury or damage of equipment and facilities such as an aircraft and the like, and great economic loss and adverse social influence are caused.

3. Extendable leg: the anti-tipping capability of the platform ladder with a certain height is an important safety index, and due to the structural limitation of the platform ladder, the anti-tipping capability is greatly weakened in a form of wide front and narrow back, and tipping accidents can occur under the extremely strong wind condition or under the action of external transverse force, so that personnel injury and equipment and facilities damage such as aircrafts are caused.

4. A traction device: some platform ladders with higher height and larger self weight are not designed with traction devices, and particularly in the process of transferring at a longer distance, the labor intensity is high, the consumed time is long, and the requirement of quick response cannot be met; some platform ladders are designed with single-rod central traction at universal wheel sides, and need to pass through at a lower speed at a road section with a smaller turning radius so as to prevent the platform ladder with a higher center of gravity from tipping accidents, and the single-rod central traction design does not have the function of righting the platform ladder in the turning process.

Disclosure of Invention

In order to solve the defects of the prior art, the utility model aims to provide a movable platform ladder, which comprises a guardrail, a working platform, a steel wire rope, a front frame, a caster wheel, a bottom frame, a winding device and a ladder frame,

the guardrails are positioned on two sides of the working platform;

the front frame is positioned between the working platform and the bottom frame;

the caster wheels are fixedly arranged on the bottom frame and the front frame;

the winding device is fixed on the front frame and is connected with the guardrail through the steel wire rope;

the ladder frame is connected between the working platform and the underframe.

Furthermore, the winding device is driven manually or electrically.

Furthermore, the guardrail moves up and down along the guide device on the working platform under the driving of the hoisting device and the steel wire rope.

The guardrail lifting device further comprises a locking device and an unlocking device, wherein the locking device is arranged on the working platform and used for locking the guardrail at a set position, and the unlocking device is used for unlocking the guardrail at the set position so as to lift or lower the guardrail.

Further, the locking pin is positioned on a brake disc of the caster.

Further, the brake disc and the caster wheel are integrally or separately installed.

Further, the device also comprises a support leg and a spring pin positioned on the support leg.

Further, the multifunctional trolley further comprises a towing rod arranged on the underframe, and the towing rod is of a double-rod sliding torsion-resistant structure.

The utility model discloses a movable platform ladder compares with prior art, has following beneficial effect:

1. the guardrail is lifted and lowered on the ground through the hoisting device and the steel wire rope, the weight of the guardrail is no longer a factor influencing the labor intensity of operators due to the existence of the speed ratio of the hoisting device, the guardrail can be lifted and lowered easily, and the damage caused by the fact that the overturning guardrail can not be stopped timely due to inertia and possibly collides aircrafts, equipment or personnel can be avoided; because the guardrail is operated to lift on the ground, the risk of falling of potential personnel caused by high-altitude operation is avoided, more attention is paid to avoiding scraping and colliding aircraft equipment and personnel injury, and unsafe events are effectively reduced.

2. The locking device of platform ladder truckle can be with the reliable locking of truckle, under the unintended unblock condition, the truckle can not produce unexpected rotation and aversion, especially under extreme strong wind weather, helps promoting the stability of platform ladder, and the reliability is far above brake class device. When the platform ladder needs to be moved, the caster locking pin can be reliably positioned at the unlocking position to be conveniently moved, and the operation is convenient and the reliability is high.

3. The landing leg can greatly improve the anti-overturning stabilizing moment of the platform ladder under the unfolding condition, particularly under the condition of extreme windy weather, the wind speed change is large and unpredictable, the possibility of overturning of the platform ladder is greatly improved by unfolding the landing leg, the safety of aircrafts, facility equipment and personnel is effectively protected, and the occurrence of unsafe events is effectively reduced.

4. The traction device is designed as a double-rod sliding anti-torsion drag rod, so that the anti-rollover capacity of the platform ladder is improved under the conditions of turning and the like, the anti-torsion capacity of the traction device is improved, and the traction device is beneficial to optimizing the steering torque distributed to the two universal wheels.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, and together with the description, explain the invention and are not intended to limit the invention. In the drawings:

fig. 1 is a schematic perspective view of a movable platform ladder according to the present invention;

fig. 2 is a schematic view of a caster structure of the movable platform ladder according to the present invention;

fig. 3 is a schematic view of a working platform locking device of the movable platform ladder according to the present invention;

fig. 4 is a schematic view of a support leg structure of the movable platform ladder according to the present invention;

fig. 5 is a schematic diagram of the structure of the traction device of the movable platform ladder according to the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Fig. 1 is a schematic perspective view of a movable platform ladder according to the present invention, and fig. 2 is a schematic caster structure of the movable platform ladder according to the present invention; fig. 3 is a schematic view of a working platform locking device of the movable platform ladder according to the present invention; fig. 4 is a schematic view of a support leg structure of the movable platform ladder according to the present invention; fig. 5 is a schematic structural view of a traction device of a movable platform ladder according to the utility model. As shown in fig. 1-5, the movable platform ladder of the present invention comprises a guardrail 1, a working platform 2, a wire rope 3, a front frame 4, a caster 5, a bottom frame 6, a winding device 7, a ladder frame 8, a locking pin 9, a brake disc 10, an unlocking device 11, a locking device 12, a spring pin 13, a leg 14, a positioning pin 15, and a towing bar 16, wherein,

the utility model discloses a movable platform ladder is by the front stall 4, chassis 6, work platform 2 and ladder frame 8 and relevant member link to each other and constitute, hoisting device 7 can be manual formula or electrodynamic type, hoisting device 7 drives 1 along the guider on the work platform 2 of the drive guardrail of wire rope 3 and upwards raises or the lowering movement, locking device 12 on the work platform 2 makes it can not have the removal by oneself with the locking of guardrail 1 in the settlement position, when needing to remove, step on unlocking device 11 on the work platform 2, make guardrail 1 can raise or lower.

After the platform ladder is erected in place, a pin shaft of a locking pin 9 is inserted into a locking position on a brake disc 10 arranged on the caster 5, the pin shaft limits the brake disc to rotate, the brake disc is always clamped at the locking position of the brake disc under the action of a spring in the locking pin 9, and the caster 5 is in a reliable locking state; when the platform ladder needs to be moved, the pin shaft of the locking pin 9 is pulled out to be separated from the locking position on the brake disc 10, and then the platform ladder can be freely moved.

During the erection and parking of the working ladder, the spring pin 13 is lifted while the support legs 14 are drawn outwards, the spring pin 13 is released, and the pin shaft of the spring pin is automatically locked in the position under the action of the spring when the extension position is reached, so that the support legs 14 can be reliably limited in the position; when the supporting legs 14 need to be retracted, the spring pins 13 are lifted to release the limit, the supporting legs 14 are pushed inwards, the spring pins 13 are loosened, pin shafts of the spring pins are automatically locked at the retracted positions under the action of springs when the retracted positions are reached, and the supporting legs 14 can be reliably locked;

when the traction device is required to pull and transition, the positioning pin 15 is lifted to release positioning, the tow bar 16 with double-bar sliding anti-torsion design is pulled backwards to a pulling position, the positioning pin 15 is put down to reliably lock the tow bar 16 at the pulling position, otherwise, the tow bar can be locked at a non-pulling position, and the tow bar 16 can rotate along the rotating pin to adapt to the position of a traction hook of the traction device.

Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A movable platform ladder comprises a guardrail, a working platform, a steel wire rope, a front frame, trundles, a bottom frame, a hoisting device and a ladder frame, and is characterized in that,

the guardrails are positioned on two sides of the working platform;

the caster wheels are fixedly arranged on the bottom frame and the front frame;

the hoisting device is fixed on the front frame and is connected with the guardrail through the steel wire rope;

the ladder frame is connected between the working platform and the underframe.

2. The mobile platform ladder of claim 1, wherein the winching means is manually or electrically driven.

3. The mobile platform ladder of claim 1, wherein the balustrade is moved up and down along a guide on the work platform by the hoist and the wire rope.

4. The moveable platform ladder of claim 1, further comprising a locking device and an unlocking device disposed on the work platform, the locking device locking the fence in a set position, the unlocking device unlocking the fence in a set position such that the fence is raised or lowered.

5. The mobile platform ladder of claim 1, further comprising a locking pin on a brake disc of the caster.

6. The mobile platform ladder of claim 5, wherein the brake disc and the caster wheel are integrally or separately mounted.

7. The moveable platform ladder of claim 1, further comprising a leg and a spring pin on the leg.

8. The mobile platform ladder of claim 1, further comprising a tow bar disposed on the undercarriage, the tow bar being a double bar sliding anti-torque structure.