RU183208U1 - Trolley for transporting fan flaps of a nacelle of an aircraft turbojet engine - Google Patents

Abstract

The utility model relates to airfield carts for transporting fan flaps of a nacelle of an aircraft turbojet engine. The technical result is the adaptation of the loading platform for fixing on it the fan nacelle assembly of an aircraft turbojet engine, ease of access during maintenance and improving the maneuverability of the truck by turning the front wheels at an angle of 120 degrees in both directions and braking the rear wheels with a parking brake. The frame 1 of the trolley (Fig. 1) is a welded frame structure on which stairs are installed side stairs 12, 13 with inclined racks 14, 15 and handrails 16, 17 (Fig. 2) having a working platform 18, designed for easy access to the upper nodes of the suspension of the flaps. On the inclined racks 14, 15, a rocker arm 19 is mounted for suspending the flaps of the fan of the engine nacelle of an aircraft turbojet engine. The frame 1 is supported by the front axle 2 and the rear wheels 4. The front axle 2 is rotated by an angle of more than 90 degrees with the carrier 3 due to the turntable 9. At the front and rear of the frame 1 there are guards 36, 37, outlining the dimensions of the base of the frame 1 of the trolley, protecting transported shutters from damage in case of a collision of the cart with an obstacle. 6 c.p. f-ly, 7 IL.

Description

The utility model relates to the field of aircraft maintenance, namely, to airfield trolleys for transporting fan flaps of an engine nacelle of an aircraft turbojet engine, in particular, PW1400G and PD-14 engines of the MS-21 family of aircraft.

During assembly, repair and maintenance of aircraft, airfield trailers and hand-operated carts are used to transport critical parts and assemblies to aircraft parking areas. The design of transport trolleys is usually created in the form of transported cargo. In addition, high requirements for maneuverability in the conditions of aerodrome space are imposed on airfield carts and exclude cargo damage.

Known trolley for transporting an aircraft contains a loading platform (frame), equipped with adjustable length support legs interacting with the load (RU 1805619, B64F 1/22, publ. 09.07.1995) [1].

Another device for transporting and mounting the cones of the aircraft (RU 1822096, IPC B64F 1/22, publ. 07.20.1996) [2] contains a frame mounted on wheels, on which there are front and rear lifting racks, on which are mounted, respectively, front smaller the diameter of the bearing lodgement and the rear larger diameter bearing lodgement, each of which contains conical roller bearings pivotally mounted on the axles in the cages.

An aerodrome transport trolley is also known, including a platform in the form of a frame, a four-wheeled chassis and a telescopic carrier with a parallelogram device for turning the front wheels within 55 °, characterized in that it is equipped with removable transverse beams, bolted to the frame by bolt joints, while in the beams along the entire length, marked holes are made for fastening with the help of pins of removable lodgements made with the possibility of laying cylindrical products on them (RU 12402 U1, IPC V65N 5/04, publ. 10.01.2000) [3]. The maneuverability of this trolley is provided by the changeover of wheel units.

On the market for similar products, a VM-2000 cargo trolley for transporting aircraft engines is presented (Gorodotsky Mechanical Plant, PAT (Prat GMZ), Ukraine, https://ua.all.biz/telezhka-gruzovaya-vm-2000-telezhka-dlya-g1604072 ) [4], which contains the front and rear axles, carrier, four wheels and four supports, on which are located two parallel channels with movable clamps for reliable installation of the load.

The closest constructive implementation to the claimed utility model is a trolley for transporting the NK-8 aircraft engine (T54.60.9960.200, Technical Maintenance Manual TU-154B, Book 9, Fig. 5.2, July 5, 1982 http: // aviadocs .com / RLE / Tu-154B / CD1 / RYETO / Tu-154B_RYETO_kn9.pdf) [5], adopted as a prototype.

The prototype device contains a cargo platform in the form of a welded frame of a tubular structure on four wheels. The front wheels are driven by a carrier through a control rod. The rear wheels can be swiveled with levers, which in the transport position are fixed with a pin.

The well-known trolley - the prototype is not intended for transporting a fan nacelle of an aircraft turbojet engine nacelle, the angle of rotation of the front wheels is limited by the kinematics of the structure, which impairs its maneuverability.

The objective of this utility model is to develop a maneuverable trolley for the gentle transportation of the engine nacelle fan assembly of an aircraft turbojet engine and convenient to maintain.

The technical result of this utility model is the adaptation of the loading platform for fixing the engine nacelle fan assembly of an aircraft turbojet engine, ease of access during maintenance, improving the maneuverability of the truck by turning the front wheels at an angle of 120 degrees in both directions and braking the rear wheels with a parking brake.

The specified technical result is achieved by the fact that the trolley for transporting a fan nacelle of an aircraft turbojet engine nacelle contains a loading platform in the form of a welded tubular frame mounted on four wheels, a carrier connected by a link to the front wheel control unit.

According to a utility model, the front wheel steering assembly includes a front axle on which the trolley frame is supported, a turntable is mounted on it, which is a hinge assembly consisting of an upper cage that is attached to the trolley frame and a lower cage attached to the front axle, the carrier of the trolley is connected with the front axle with a horizontal axis, the link is connected to a beam on which the brake pads of the parking brake are fixed on both sides to brake the front wheels when the carrier is mounted in a vertical position Using the lock, there are barriers in the front and rear of the frame, two side stairs with inclined racks and handrails having a working platform are installed on the frame. On the inclined racks there is a rocker made in the form of two beams with transverse jumpers, for suspension and fixing of the fan flaps, upper and lower arms equipped with fingers are welded to each beam.

In a preferred embodiment of the trolley:

- the upper and lower sleeves of the turntable have an annular groove filled with balls;

- the range of angles of rotation of the front axle is 120 degrees in both directions;

- the frame has soft linings for supporting the lower part of the fan flaps;

- the trolley comes with four belts equipped with hooks at the ends;

- the frame is equipped with rigging loops;

- channels for a forklift are fixed under the frame.

The presence of a steered bridge made with a turntable, the angle of rotation of which in each direction is limited only by the design of the front axle, and the presence of a parking brake ensures the maneuverability of the trolley in an airfield environment. Stairs assembled with the working platform form a rigid pyramidal structure, which provides both the strength and rigidity of the entire structure for fixing and fixing the fan flaps, as well as access to their suspension points. Additional reliability for fixing the fan flaps is provided by four straps with hooks at the ends. For transporting the trolley together with the load, for example, in the cabin, there are rigging loops on the frame.

Airdrome carts adapted for transporting engine fan nacelle bundles of an aircraft turbojet having the above operational properties are not known from the prior art.

The design of the utility model is illustrated by the figures of the drawings.

FIG. 1 - general view.

FIG. 2 - stairs.

FIG. 3 - rocker.

FIG. 4 - front axle.

FIG. 5 - turntable, front view.

FIG. 6 - suspension of the fan flaps of the engine nacelle of the PW1400G engine of the MC-21 family of aircraft on the beam.

The notation in FIG. 1, 2, 3, 4, 5:

1 - frame

2 - front axle

3 - drove

4 - wheel

5 - a block of a lay brake

6 - a beam of a lay brake

7 - draft of a lay brake

8 - carrier lock

9 - turntable

10 - top clip

11 - bottom clip

12, 13 - side stairs

14, 15 - stair racks

16, 17 - stairs handrails

18 - work platform

19 - rocker

20, 21 - beams

22, 23 - jumpers

24, 25, 26, 27, 28, 29 - upper brackets

30, 31, 32, 33 - lower brackets

34, 35 - guide channels

36 - front guard

37 - rear railing

38, 39, 40, 41 - belts

42 - rigging loops

43, 44 - soft supports.

The frame 1 of the trolley (Fig. 1) is a welded frame structure on which stairs are installed side stairs 12, 13 with inclined racks 14, 15 and handrails 16, 17 (Fig. 2) having a working platform 18, designed for easy access to the upper nodes of the suspension of the flaps. On the inclined racks 14, 15, a rocker arm 19 is mounted for suspending the flaps of the fan of the engine nacelle of an aircraft turbojet engine.

Frame 1 is supported by the front axle 2 and the rear wheels 4. The front axle 2 is rotated by an angle of more than 90 degrees with the carrier 3 due to the turntable 9. There are guards 36, 37 in the front and rear of the frame 1, which outline the dimensions of the base of the frame 1 of the trolley protecting the transported shutters from damage in case of a possible collision of the trolley with an obstacle.

To hold the trolley during parking, the parking brake 5 is used, which is activated when the carrier 3 is raised to a vertical position with its fixation using the lock 8.

The beam 19 is a welded frame structure that contains beams 20, 21 with transverse jumpers 22, 23. Upper brackets 24, 25, 26, 27, 28, 29 are welded to the beams 20, 21 for fixing the fan flaps of one type of aircraft engine, and lower brackets 30, 31, 32, 33 are welded from below to fix the flaps of another aircraft engine. (Fig. 3). Fingers are inserted into the holes of the brackets, on which the left and right wings of the nacelle fan are suspended. Thus, the rocker arm 19 has two groups of brackets with locking fingers, one of which, the upper one, is used to fix the PW1400G engine leaves, (Fig. 6), and the other, right and lower, has the PD-14 engine leaves. In this case, the lower edge of the flaps rests on the platforms on the frame 1 of the trolley, the surface of which is protected by soft rubber overlays, which protects the fan flaps from damage when touched. The flaps are suspended on the trolley by belts 38, 39, 40, 41. The frame 1 is supported by the front axle 2 and the rear wheels 4. The front axle 2 is rotated by the carrier 3 due to the turntable 9. The rotary assembly ensures the maneuverability of the carriage due to the turntable 9 , (Fig. 4, 5), which is a hinge assembly consisting of an upper clip 10 and a lower clip 11 having an annular groove filled with balls. The upper holder 10 of the turntable 9 is fixed to the frame 1 of the trolley, and the lower one to the front axle 2, which allows you to rotate the front axle relative to the frame by 120 degrees in both directions, giving the direction of movement of the trolley. When the carrier 3 was installed in a vertical position, the rod 7 connected to it by an axis pulls the beam 8, on which two blocks 5 are mounted, each of which is located opposite the corresponding front wheel of the front axle. In this case, the block 5 presses on the tire of the wheel, thereby ensuring a stop of the rotation of the wheel and keeping the trolley from rolling. The carrier 3 is fixed in an upright position using the lock 8.

The cart can be used as a universal means for transporting fan flaps of the nacelle of other types of aircraft engines, for which the beam can be made with the geometry of the brackets for a specific type of engine.

Side stairs 12, 13 assembled with a working platform 18 form a rigid pyramidal structure, while providing strength and rigidity of the entire structure for securing and fixing the fan flaps, and also provide access to their suspension points.

Under the frame on the side of the trolley there are guide channels designed to insert the forks of the forklift truck into them to raise the trolley when loading onto a vehicle, for example, in the cabin of an airplane.

Design documentation was developed, a prototype of the inventive trolley was made.

The main technical data and characteristics of the cart are shown in the table:

Information sources:

1. RU 1805619, B64F 1/22, publ. 07/09/1995.

2. RU 1822096, IPC B64F 1/22, publ. 07/20/1996.

3. RU 12402 U1, IPC V65H 5/04, publ. 01/10/2000.

4. Cargo truck VM-2000 for transporting aircraft engines. Gorodotsky Mechanical Plant, PAT (Prat GMZ), Ukraine, https://ua.all.biz/telezhka-gruzovaya-vm-2000-telezhka-dlya-g1604072.

5. The cart for transportation of the NK-8 aircraft engine. T54.60.9960.200, Technical Maintenance Manual TU-154B, Book 9, Fig. 5.2 July 5, 1982 http://aviadocs.com/RLE/Tu-154B/CD1/RYETO/Tu-154B_RYETO_kn9.pdf. - prototype.

Claims (7)

1. A cart for transporting fan flaps of a nacelle of an aircraft turbojet engine, comprising a cargo platform in the form of a welded tubular frame mounted on four wheels, a carrier connected by a link to the front wheel control unit, characterized in that the front wheel control unit includes a front axle, which rests on the frame of the trolley, a rotary circle is mounted on it, which is a hinge assembly consisting of an upper cage that is attached to the frame of the trolley and the lower pits attached to the front axle, the carrier is connected to the front axle by a horizontal axis, the link is connected to a beam on which the brake pads of the parking brake are fixed on both sides to brake the front wheels when the carrier is mounted in a vertical position with a latch in the front and rear of the frame there are fences, two side stairs with inclined racks and handrails having a working platform are installed on the frame, a rocker arm made in the form of two beams with transverse jumpers is installed on inclined racks s, for the suspension and fixing of the flaps to both fan beams are welded from above the upper brackets and lower brackets welded bottom, all the brackets are provided with locking fingers. 2. The trolley according to claim 1, characterized in that the upper and lower sleeves of the turntable have an annular groove filled with balls. 3. The truck under item 1, characterized in that the range of angles of rotation of the front axle is 120 degrees in both directions. 4. The trolley according to claim 1, characterized in that the frame has soft pads for supporting the lower part of the fan flaps. 5. The trolley according to claim 1, characterized in that the trolley comes with four belts equipped with hooks at the ends. 6. The trolley according to claim 1, characterized in that the frame is provided with rigging loops. 7. The trolley according to claim 1, characterized in that under the frame there are fixed guide channels for the forklift.

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