CN112031635A - Over-and-under type aircraft maintenance work ladder - Google Patents

Abstract

The invention discloses a lifting type airplane maintenance working ladder which comprises an underframe, a workbench, a vertical ladder, a hand-operated lifting mechanism, a manual locking ground foot mechanism and a railing, wherein moving wheels are arranged at the bottom of the underframe, the inclined ladder is arranged in front of the underframe, the workbench is arranged at the top of the underframe through the hand-operated lifting mechanism, the vertical ladder is arranged in front of the workbench, the top of the vertical ladder is fixedly connected with the workbench, the railing is arranged on two side edges of the workbench in a vertically adjustable mode through a railing guide seat, the railing guide seat is provided with a graphite copper sleeve sleeved on the railing, the manual locking ground foot mechanism comprises a handle, a connecting rod mechanism and a locking ground foot, locking ground feet are respectively arranged on two sides of the underframe, the handle is connected with the locking ground feet through the connecting rod mechanism, and the locking ground feet can be driven. The invention can adjust the working height according to the heights of different airplane models and different overhaul positions, has compact structure and can improve the working efficiency.

Description

A lift-type aircraft maintenance work ladder

technical field

The invention relates to a lift-type aircraft maintenance working ladder.

Background technique

When maintenance or inspection of the aircraft is carried out by the maintenance personnel, when encountering a place where the normal height of the person cannot be reached, they all need to use the assistance of the working ladder to complete the inspection and repair work.

However, because the height of the aircraft fuselage changes with the weight of the aircraft, the staff needs to replace the working ladders with different heights according to the working height, which leads to low work efficiency.

The shortcomings of the existing aircraft maintenance work ladders:

1. The existing maintenance work ladder has a bulky structure and cannot enter the narrow work space;

2. The height of the working platform is fixed, which cannot adapt to the height requirements of different repair parts on various models;

3. Ordinary pull-out movable railings are easy to cause the railing and the casing to be stuck due to the asynchronous rising speed on both sides of the railing;

4. The work efficiency of the hand-crank locking foot is too low, and the operation time required for locking or unlocking is long.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a lift-type aircraft maintenance working ladder, which can adjust the working height according to different aircraft models and the heights of different maintenance parts, has a compact structure, can improve working efficiency, and can avoid railings The stuck phenomenon occurs during the up and down adjustment, and the operation of locking the feet is simple and the operation efficiency is high.

To solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows:

A lift-type aircraft maintenance work ladder, which includes a bottom frame, the bottom of the bottom frame is provided with a moving wheel, and the front of the bottom frame is provided with an inclined ladder. The foot mechanism and railings are manually locked, the worktable is installed on the top of the bottom frame through the hand-operated lifting mechanism, the straight ladder is set in front of the worktable, the top of the straight ladder is fixedly connected with the worktable, and the lower part of the straight ladder extends to the inclined ladder It is located at the top of the inclined ladder, and is close to the top of the inclined ladder. The railings are installed on both sides of the workbench through the railing guide seat, which can be adjusted up and down. The railing guide seat is provided with graphite copper sleeves on the railing. It is carried out under the limitation of graphite copper sleeve. The hand-operated lifting mechanism drives the worktable together with the vertical ladder and railing. The manual locking foot mechanism includes a handle, a link mechanism and a locking foot. The locking foot can be lifted up and down, the handle is connected with the locking foot through a link mechanism, and the locking foot can be moved up and down by operating the handle.

Further, the hand-operated lifting mechanism includes a scissors mechanical mechanism, a chain, a first sprocket, a second sprocket and a hand wheel, the worktable is set on the scissors mechanical mechanism, and the first sprocket is set on the scissors mechanical mechanism. On the operating shaft of the hand wheel, the hand wheel is rotatably arranged on the side of the chassis, the second chain wheel is coaxially arranged at the end of the hand wheel, and the first chain wheel and the second chain wheel are connected by a chain.

Further, the railing is provided with vertical poles, the railing guide seat also includes sleeves vertically fixed on both sides of the workbench, and graphite copper sleeves are respectively provided at both ends of the middle hole of the sleeve, and the vertical poles Correspondingly through the sleeve, the vertical rod is in contact with the graphite copper sleeve, but there is a gap between it and the hole wall of the middle hole.

Further, the aircraft maintenance work ladder also includes a locking pin, the sleeve is provided with a locking hole, the vertical rod is provided with a plurality of adjustment holes, the adjustment holes are arranged vertically, and the locking pin passes through the locking hole and one of the adjustment holes.

Further, the front parts of the two sides of the chassis are respectively provided with a locking foot, the link mechanism includes a connecting shaft and two sets of connecting rod groups respectively arranged on the locking feet on both sides, and the connecting shaft is laterally rotatable and arranged at the bottom. At the bottom of the frame, the two ends of the connecting shaft are located above the locking feet on both sides respectively, the handle is connected with one end of the connecting shaft, and the connecting rod group connects the locking feet and the connecting shaft; the rotation of the connecting shaft is operated by the handle to connect The rotation of the shaft will drive the lifting and lowering of the locking foot through the connecting shaft.

Further, the connecting rod group includes a swing rod and a connecting rod, the upper end of the swing rod is fixedly connected to the end of the connecting shaft, and swings with the rotation of the connecting shaft, the upper end of the connecting rod is hinged with the lower end of the swing rod, and the lower end of the connecting rod is connected to the The upper ends of the locking feet are hinged.

Further, the aircraft maintenance work ladder also includes a drawbar for connecting with an external trailer, and the drawbar is stowable and provided on the side of the bottom frame.

Further, protective chains are respectively provided on the front and rear sides of the workbench, and both ends of the protective chains are respectively connected with the upper parts of the railings on both sides.

Further, guardrails are respectively provided on both sides of the inclined ladder.

Further, the top of the bottom frame is provided with a vertical limit column, and the worktable will abut against the upper end of the limit column when it descends to a low point.

Compared with the prior art, the present invention has the following beneficial effects:

The aircraft maintenance work ladder of the invention is directly equipped with a hand-operated lifting mechanism and a workbench on the top of the bottom frame, and the structure is compact, so that the aircraft maintenance work ladder can enter the narrow interior space of the aircraft, and it is convenient for the staff to approach the maintenance site.

The worktable installed by the hand-operated lifting mechanism has a lifting function, and the height can be adjusted according to the actual work requirements. And the hand-operated lifting mechanism is a manual operation mechanism, which eliminates the labor cost of post-maintenance compared with the hydraulic lifting mechanism.

The overall design of the aircraft maintenance work ladder of the invention is simple and light, and the staff can realize the work of pushing the work ladder, changing the height, etc. by one person, which greatly improves the work efficiency.

The invention restricts the up and down sliding adjustment of the railing through the graphite copper sleeve, which can reduce the frictional force of the railing during the up and down sliding adjustment, which can make the railing easier to adjust and avoid the blocking phenomenon when the railing is adjusted up and down.

The present invention directly connects the handle and the locking foot through the link mechanism, and operating the handle can directly drive the locking foot to rise and fall, thereby realizing the quick locking and unlocking of the position of the chassis, with simple operation and high operation efficiency.

Due to the advantages of light structure, flexible use, adjustable height, etc., the present invention can be applied to the maintenance and inspection work of aircrafts of multiple types and different parts.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the present invention;

Fig. 2 is the sectional schematic diagram of the sleeve of the present invention;

FIG. 3 is a schematic view of the assembly of the connecting rod group and the locking foot of the present invention.

The meaning of the reference symbols in the figure:

1- Bottom frame; 2- Workbench; 3- Scissor fork mechanism; 4- Hand wheel; 5- Chain; 6- Railing; 7- Protection chain; 8- Limit column; 9- Straight ladder; 10- Inclined ladder ; 11- mobile wheel; 12- universal wheel; 14- drawbar; 15- railing guide seat; 16- sleeve; 17- graphite copper sleeve; 18- sleeve cover; 19- guardrail; 20- handle; 21- Connecting shaft; 22-bearing seat; 23-swing rod; 24-connecting rod; 25-sliding sleeve; 26-locking foot; 27-first sprocket; 28-second sprocket; 29-operating shaft; 30- Pole; 31-adjustment hole; 32-lock hole.

Detailed ways

The present invention will be further described below in conjunction with the embodiments.

As shown in FIG. 1 , a lift-type aircraft maintenance work ladder includes a base frame 1 , a workbench 2 , a straight ladder 9 , a hand-operated lift mechanism, a manual locking foot mechanism and a railing 6 .

The bottom of the bottom frame 1 is provided with a moving wheel 11, of which the front end is a universal wheel 12, the front of the bottom frame 1 is provided with an inclined ladder 10, and the two sides of the inclined ladder 10 are respectively provided with guardrails 19, and the guardrails 19 can also be used as as a handrail.

The worktable 2 is installed on the top of the base frame 1 through a hand-operated lifting mechanism. The hand-operated lifting mechanism of this embodiment includes a scissors mechanical mechanism 3, a chain 5, a first sprocket 27, a second sprocket 28 and a hand wheel 4. The worktable 2 is set on the top of the scissors mechanical mechanism 3, and the first The sprocket 27 is arranged on the operating shaft 29 of the scissor mechanism 3, the hand wheel 4 is rotatably arranged on the side of the chassis 1 through the bearing, the hand wheel 4 and the first sprocket 27 are located on the same side, and the hand wheel 4 is located The middle of the bottom frame 1 is convenient for workers to operate. The second sprocket 28 is coaxially connected to the hand wheel 4. The second sprocket 28 is driven to rotate by the hand wheel 4. The first sprocket 27 and the second sprocket 28 correspond up and down. The first sprocket 27 and the second sprocket 28 are connected by the chain 5 . By turning the hand wheel 4, the operation shaft 29 of the scissors mechanical mechanism 3 can be driven to rotate, so that the scissors mechanical mechanism 3 can be moved up and down, and finally the worktable 2 can be moved up and down to adjust.

The straight ladder 9 is arranged in front of the workbench 2 , the top of the straight ladder 9 is fixedly connected with the workbench 2 , and the lower part of the straight ladder 9 extends to the top of the inclined ladder 10 and is close to the top of the inclined ladder 10 . When in use, the staff first climbs up from the inclined ladder 10 to the straight ladder 9, and then climbs up to the workbench 2 along the straight ladder 9.

The railings 6 are installed on both sides of the workbench 2 so as to be adjustable up and down through the railing guide seat 15. The railing guide seat 15 is provided with a graphite copper sleeve 17 sleeved on the railing, and the up and down sliding of the railing 6 is adjusted to be on the graphite copper sleeve 17. carried out under restrictions. Specifically, the front and rear sides of the railing 6 are respectively provided with vertical poles 30, and the railing guide base 15 also includes sleeves 16 vertically fixed on both sides of the workbench, and each vertical pole is provided with a sleeve. 16, as shown in FIG. 2, countersinks are respectively provided at both ends of the middle hole of the sleeve 16, graphite copper sleeves 17 are embedded in the countersunk holes, and sleeves 16 are respectively fixed with screws at both ends of the sleeve 16. The cylinder cover 18 and the sleeve cover 18 are annularly mounted, and the sleeve cover 18 presses the graphite copper sleeve 17 into the counterbore. The vertical rod 30 is correspondingly passed through the sleeve 16, and the vertical rod 30 is in contact with the graphite copper sleeve 17, but there is a gap between the vertical rod 30 and the hole wall of the middle hole, and the graphite copper sleeve 17 reduces the friction when the vertical rod 30 slides up and down to adjust. force. In order to lock the railing 6, the aircraft maintenance work ladder is also provided with a locking pin corresponding to each sleeve. Arrangement, the locking pin is inserted into the locking hole 32 and one of the adjustment holes 31 to lock the railing 6, and the locking pin is inserted into the adjustment holes 31 of different heights to lock the railing 6 at different heights. When in use, the hand-operated lifting mechanism drives the worktable together with the straight ladder and the railing.

Wherein, the manual locking foot mechanism includes a handle 20, a link mechanism and a locking foot 26. In this embodiment, the front parts of both sides of the chassis 1 are respectively provided with a locking foot 26, and the locking feet 26 on both sides are symmetrical Specifically, vertical sliding sleeves 25 are respectively provided at the fronts of both sides of the chassis 1, and the locking feet 26 are provided with uprights, and the uprights are passed through the sliding sleeves 25, so that the locking feet 26 can be lifted up and down. set up. The handle 20 is connected with the locking foot 26 through a link mechanism, and the locking foot 26 can be moved up and down by operating the handle 20 .

The connecting rod mechanism includes a connecting shaft 21 and two sets of connecting rod sets respectively provided with the locking feet on both sides. The connecting shaft 21 is laterally rotatable and arranged at the bottom of the chassis 1, and the two ends of the connecting shaft 21 are respectively located on the two sides. above the locking feet 26 on the side. Specifically, bearing seats 22 are respectively fixed on the front parts of both sides of the chassis 1 by bolts, and both ends of the connecting shaft 21 are respectively rotatably supported on the bearing seats 22 . The handle 20 is connected with the right end of the connecting shaft 21. The handle 20 in this embodiment is an upwardly extending operating rod. The lower end of the operating rod is connected with the right end of the connecting shaft 21, and the connecting shaft can be rotated through the operating rod.

The connecting rod group connects the locking foot 26 and the connecting shaft 21. As shown in FIG. 1 and FIG. 3 , the connecting rod group in this embodiment includes a swing rod 23 and a connecting rod 24, and the upper end of the swing rod 23 is fixedly connected to the connecting shaft 21. The ends swing with the rotation of the connecting shaft 21 . Therefore, when the connecting shaft 21 is rotated by the handle 20, the locking feet 26 can be moved up and down. When the locking feet 26 are lowered to the low point, the lower surfaces of the locking feet 26 are supported on the ground, and the front part of the base frame 1 is supported by the ground. Hold up, the two universal wheels 12 at the front are at a certain distance from the ground, so as to lock the position of the chassis 1. At this time, the connecting rod group is basically in a vertical state and will not rotate under the pressure of the locking feet 26. .

In order to facilitate the movement of the aircraft maintenance work ladder, a drawbar 14 is provided on the side of the chassis 1. The drawbar 14 is used to connect with an external trailer. When moving, the aircraft maintenance ladder can be dragged by the external trailer, and the drawbar 14 can be rotated It is evenly attached to the side surface of the chassis 1 so as to accommodate the drawbar 14 .

In order to ensure safety, protective chains 7 are respectively provided on the front and rear sides of the workbench 2 , and the two ends of the protective chains 7 are respectively connected with the upper parts of the railings 6 on both sides.

In this embodiment, four vertical limit columns 8 are arranged on the top of the base frame 1, and the four limit columns 8 are distributed at four corners. Thus, the range of motion of the workbench 2 is limited.

When the staff needs to carry out maintenance or inspection on the aircraft, the aircraft maintenance ladder can be moved to the position for repair or inspection through the trailer, and then the handle 20 is turned so that the locking feet 26 are supported on the ground, and the universal wheel 12 at the front end is supported on the ground. After leaving the ground and fixing the position of the aircraft maintenance work ladder, turn the handwheel 4 according to the height of the maintenance or inspection position, and adjust the worktable 2 to an appropriate height. After that, the staff can climb up to the straight ladder through the inclined ladder 10 9. Climb up to the workbench 2 along the straight ladder 9, and perform maintenance or inspection work on the workbench 2. After completing the maintenance or inspection work, turn the handle 20 to lift the locking foot 26, and then the aircraft maintenance work ladder can be moved.

The above-mentioned embodiments of the present invention are not intended to limit the scope of protection of the present invention, and the embodiments of the present invention are not limited thereto. According to the above-mentioned contents of the present invention, according to common technical knowledge and conventional means in the field, without departing from the present invention Under the premise of the above basic technical idea, other various modifications, replacements or changes made to the above structure of the present invention should all fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a over-and-under type aircraft maintenance work ladder, its includes the chassis, the bottom of chassis is equipped with removes the wheel, the preceding inclined ladder that is equipped with of chassis, its characterized in that: the hand-operated lifting mechanism is used for driving the workbench to lift together with the vertical ladder and the railing to lift, the hand-operated locking mechanism comprises a handle, a connecting rod mechanism and a locking foot margin, the locking anchor feet are respectively arranged on two sides of the base frame, the locking anchor feet can ascend and descend vertically, the handle is connected with the locking anchor feet through the connecting rod mechanism, and the handle can be operated to drive the locking anchor feet to ascend and descend.

2. The elevating aircraft service ladder of claim 1, wherein: hand formula elevating system is including cutting fork mechanical mechanism, chain, first sprocket, second sprocket and hand wheel, the workstation is established cut fork mechanical mechanism's the higher authority, first sprocket is established cut fork mechanical mechanism's operating axis is last, the hand wheel is rotatable to be established the side of chassis, the second sprocket is coaxial to be established the tip of hand wheel, first sprocket and second sprocket pass through the chain and connect.

3. The elevating aircraft service ladder of claim 1, wherein: the railing is equipped with the pole setting of vertical direction, the railing guide holder still includes vertical the fixing the sleeve on workstation both sides limit the both ends of telescopic centre bore are equipped with respectively graphite copper sheathing, the pole setting correspond wear in the sleeve, the pole setting with graphite copper sheathing contact, nevertheless with be equipped with the clearance between the pore wall of centre bore.

4. The elevating aircraft service ladder of claim 3, wherein: the aircraft maintenance working ladder further comprises a locking pin, a locking hole is formed in the sleeve, a plurality of adjusting holes are formed in the vertical rod and are vertically arranged, and the locking pin penetrates through the locking hole and one of the adjusting holes.

5. The elevating aircraft service ladder of claim 1, wherein: the front parts of two sides of the underframe are respectively provided with one locking ground foot, the connecting rod mechanism comprises a connecting shaft and two groups of connecting rods which are respectively arranged corresponding to the locking ground feet on the two sides, the connecting shaft is transversely and rotatably arranged at the bottom of the underframe, two end parts of the connecting shaft are respectively positioned above the locking ground feet on the two sides, the handle is connected with one end of the connecting shaft, and the groups of connecting rods are connected with the locking ground feet and the connecting shaft; the connecting shaft is operated by the handle to rotate, and the rotation of the connecting shaft drives the locking ground feet to lift through the connecting shaft.

6. The elevating aircraft service ladder of claim 5, wherein: the connecting rod set comprises a swing rod and a connecting rod, the upper end of the swing rod is fixedly connected to the end portion of the connecting shaft and swings along with the rotation of the connecting shaft, the upper end of the connecting rod is hinged to the lower end of the swing rod, and the lower end of the connecting rod is hinged to the upper end of the locking anchor.

7. The elevating aircraft service ladder of claim 1, wherein: the aircraft maintenance working ladder further comprises a draw bar used for being connected with an external trailer, and the draw bar can be arranged on the side edge of the underframe in a containing mode.

8. The elevating aircraft service ladder of claim 1, wherein: and the front side and the rear side of the workbench are respectively provided with a protective chain, and the two ends of each protective chain are respectively connected with the upper parts of the handrails at the two sides.

9. The elevating aircraft service ladder of claim 1, wherein: and two side edges of the inclined ladder are respectively provided with a guardrail.

10. The elevating aircraft service ladder of claim 1, wherein: the top of chassis is equipped with vertical spacing stand, the workstation will support when dropping to the low point and lean on in the upper end of spacing stand.

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