Main landing gear structure bearing test device

Abstract

The utility model discloses a main undercarriage structure bearing test device which comprises a test bench, a side beam, a front beam, a top beam and a rear beam, the front beam and the rear beam are arranged at the front end and the rear end of the test bench, the side beam is arranged on one side face of the test bench, the top beam is installed on the top between the front beam and the rear beam and arranged on the top of the test bench, and the front beam and the rear beam are arranged on the test bench. A column clamp is arranged on the test bench, a test piece is clamped on the column clamp, a false wheel clamp is installed on the test piece, a base of a loading actuator cylinder adopts a universal joint form, the end part of the loading actuator cylinder adopts a fisheye bearing form, stable loading of a load can be realized, and it is ensured that the load direction is not changed under the condition of small deformation. The top beam, the front beam and the rear beam are supported in a stud mode, the vertical height of the top beam can be conveniently adjusted, supporting is provided under the condition that the load direction changes, and the bearing capacity and stability of the structure are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of main landing gear structure bearing, and in particular relates to a main landing gear structure bearing test device. Background Art

[0002] The main landing gear is the main load-bearing component when the aircraft lands, and its performance is directly related to the use and safety of the aircraft. Therefore, in order to ensure the safety of the aircraft, it is necessary to study the structural bearing strength of the main landing gear.

[0003] When an aircraft is landing, the main landing gear will be subjected to its own gravity and its huge impact load; therefore, it is crucial to study the load-bearing capacity of the main force transmission structure of the landing gear during the aircraft catapult takeoff and landing process. This can expose the weak parts of the landing gear structure strength, provide a basis for improving the design, and test the quality of materials, forgings and production processes.

[0004] At present, there is no public experimental research report on the landing gear structure load test and its test method at home and abroad. Foreign countries have conducted research on this earlier and have gradually formed a complete system, but the public content is relatively small, and there is no relevant research in the published patents. Therefore, further experimental simulation research on this issue is needed. Utility Model Content

[0005] The utility model aims to provide a main landing gear structure load-bearing test device to solve the above-mentioned problem.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a main landing gear structure load-bearing test device, comprising a test bench, side beams, a front beam, a top beam and a rear beam, wherein the front beam and the rear beam are arranged at the front and rear ends of the test bench, the side beam is arranged on one side of the test bench, the top beam is installed at the top between the front beam and the rear beam and is arranged on the top of the test bench, the test bench is provided with a column clamp, the column clamp holds a test piece, a dummy wheel clamp is installed on the test piece, and the top beam, the rear beam and the side beam are all provided with an action cylinder acting on the dummy wheel clamp;

[0007] A dummy wheel clamp groove is processed on one side of the dummy wheel clamp, and the dummy wheel clamp adopts a double L-cross structure, which includes a first L-shaped component of the dummy wheel clamp and a second L-shaped component of the dummy wheel clamp. The first L-shaped component of the dummy wheel clamp is also provided with a lateral load interface, a first vertical load interface, and a first ground-turning interface. The second L-shaped component of the dummy wheel clamp is also provided with a first heading load interface, a second heading load interface, and a second vertical load interface.

[0008] Preferably, the test piece includes a pillar, a retractable actuator, a wheel axle, a resistance strut and a rotating sleeve, the pillar is clamped and fixed on the pillar clamp, the retractable actuator is hinged to the pillar and has a retractable actuator clamp installed on the other end and is fixed to the test bench through the retractable actuator clamp, the rotating sleeve is sleeved on the pillar and its axis is consistent with the pillar, the resistance strut is hinged to the rotating sleeve and has a resistance strut clamp installed on the other end and is fixed to the test bench through the resistance strut clamp.

[0009] Preferably, the dummy wheel fixture groove on the dummy wheel fixture is specifically matched with the machine wheel axle installed in the test piece to prevent the dummy wheel fixture from rotating around the axis of the machine wheel axle after being engaged with the machine wheel axle.

[0010] Preferably, the side beams, top beams and rear beams are respectively equipped with lateral actuating cylinders, vertical actuating cylinders and heading actuating cylinders, one end of which is fixed thereto via a universal joint, and the other end is hinged to the first heading load interface or the second heading load interface via a fisheye bearing; one end of the vertical actuating cylinder is fixed to the top beam via a universal joint, and the other end is hinged to the first vertical load interface or the second vertical load interface of the dummy wheel clamp via a fisheye bearing; one end of the lateral actuating cylinder is fixed to the side beam via a universal joint, and the other end is hinged to the lateral load interface of the dummy wheel clamp via a fisheye bearing.

[0011] The technical effects and advantages of the utility model are as follows: 1. The base of the loading actuator adopts a universal joint form, and the end adopts a fisheye bearing form, which can realize stable load loading and ensure that the load direction does not change under small deformation conditions;

[0012] 2. The use of studs between the top beam and the front and rear beams can facilitate the adjustment of the top beam height, and provide support when the load direction changes, thereby improving the bearing capacity and stability of the structure;

[0013] 3. The dummy wheel fixture adopts a double L-cross structure, which includes the first L-shaped part of the dummy wheel fixture and the second L-shaped part of the dummy wheel fixture. It can not only realize the independent loading of the loads in three directions of the two loading points, but also rotate the dummy wheel fixture 90° to meet the load application of the test ground-spinning working condition. The fixture of the present invention can realize the loading of the heading at the two loading points P and F of the test piece without replacing a new fixture, and can also realize the application of bending moment and vertical load during the test ground-spinning working condition.

[0014] 4. One side of the dummy wheel fixture has a groove, which can ensure that the fixture will not rotate around the axis of the wheel shaft during load loading after being engaged with the wheel shaft. In order to adapt to the angle of the pillar of the test piece, the pillar fixture of the present invention has a certain angle with the horizontal plane to ensure that its pillar is in a vertical state when the test piece is installed, which is consistent with the actual situation of the aircraft and is also conducive to the application of load. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axial view of the three-dimensional overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the test piece in the present invention;

[0017] Figure 3 It is a three-dimensional structural axial view of the dummy wheel fixture of the present invention;

[0018] Figure 4 This is the axis view of the loading state of the fake wheel fixture under normal working conditions;

[0019] Figure 5 This is the loading axis view of the dummy wheel fixture under ground-spinning conditions;

[0020] Figure 6 Mount the shaft view for the strut fixture.

[0021] In the figure: 1-test bench, 2-side beam, 3-front beam, 4-top beam, 5-rear beam, 6-test piece, 7-pillar clamp, 8-retractable actuator clamp, 9-resistance strut clamp, 10-dummy wheel clamp, 11-cruising cylinder, 12-vertical cylinder, 13-lateral cylinder, 14-first cruising load interface, 15-second cruising load interface, 16-lateral load interface, 17-first vertical load interface, 18-first ground rotation interface, 19-second vertical load interface, 20-wheel axle, 21-rotating sleeve, 22-pillar, 23-retractable actuator, 24-resistance strut, 25-first L-shaped component of dummy wheel clamp, 26-second L-shaped component of dummy wheel clamp, 27-dummy wheel clamp groove. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model provides a main landing gear structure load-bearing test device as shown in the figure, comprising a test bench 1, a side beam 2, a front beam 3, a top beam 4 and a rear beam 5, the front beam 3 and the rear beam 5 are arranged at the front and rear ends of the test bench 1, the side beam 2 is arranged on one side of the test bench 1, the top beam 4 is installed at the top between the front beam 3 and the rear beam 5 and is arranged on the top of the test bench 1, a column clamp 7 is arranged on the test bench 1, a test piece 6 is clamped on the column clamp 7, a dummy wheel clamp 10 is installed on the test piece 6, and an action cylinder acting on the dummy wheel clamp 10 is arranged on the top beam 4, the rear beam 5 and the side beam 2;

[0024] Specifically, a dummy wheel clamp groove 27 is processed on one side of the dummy wheel clamp 10, and the dummy wheel clamp 10 adopts a double L-cross structure, which includes a first L-shaped component 25 of the dummy wheel clamp and a second L-shaped component 26 of the dummy wheel clamp, and the two L-shaped components are connected by welding; the first L-shaped component 25 of the dummy wheel clamp is also provided with a lateral load interface 16, a first vertical load interface 17, and a first ground rotation interface 18; the second L-shaped component 26 of the dummy wheel clamp is also provided with a first heading load interface 14, a second heading load interface 15, and a second vertical load interface 19.

[0025] Specifically, the test piece 6 includes a pillar 22, a retractable actuator 23, a wheel axle 20, a resistance strut 24 and a rotating sleeve 21. The pillar 22 is clamped and fixed on the pillar clamp 7. The retractable actuator 23 is hinged to the pillar 22 and a retractable actuator clamp 8 is installed on the other end and the test bench 1 is fixed thereto by the retractable actuator clamp 8. The rotating sleeve 21 is sleeved on the pillar 22 and its axis is consistent with the pillar 22. The resistance strut 24 is hinged to the rotating sleeve 21 and a resistance strut clamp 9 is installed on the other end and the test bench 1 is fixed thereto by the resistance strut clamp 9.

[0026] Specifically, the dummy wheel fixture groove 27 on the dummy wheel fixture 10 cooperates with the wheel shaft 20 installed in the test piece 6 to prevent the dummy wheel fixture 10 from rotating around the axis of the wheel shaft 20 after the dummy wheel fixture 10 is engaged with the wheel shaft 20 .

[0027] Specifically, a lateral actuating cylinder 13, a vertical actuating cylinder 12 and a heading actuating cylinder 11 are respectively installed on the side beam 2, the top beam 4 and the rear beam 5. One end of 11 is fixed to 5 through a universal joint, and the other end is hinged to the first heading load interface 14 or the second heading load interface 15 of 10 through a fisheye bearing; one end of the vertical actuating cylinder 12 is fixed to the top beam 4 through a universal joint, and the other end is hinged to the first vertical load interface 17 or the second vertical load interface 19 of the dummy wheel fixture 10 through a fisheye bearing; one end of the lateral actuating cylinder 13 is fixed to the side beam 2 through a universal joint, and the other end is hinged to the lateral load interface 16 of the dummy wheel fixture 10 through a fisheye bearing.

[0028] Working principle: Install the test bench according to the loading condition of the main landing gear, fix the main landing gear on the test bench through the retracting and extending actuator clamp 8, the resistance support rod clamp 9 and the support clamp 7, so that the axis of the wheel shaft 20 is consistent with the loading axis of the lateral actuator cylinder 13; put the dummy wheel clamp 10 on the wheel shaft 20 according to the angle required by the working condition, adjust the position of the dummy wheel clamp 10, so that the dummy wheel clamp groove 27 on one side of the dummy wheel clamp 10 is engaged with the wheel shaft 20, so that the dummy wheel clamp 10 will not rotate around the axis of the wheel shaft 20; respectively adjust the actuator cylinders in three directions (vertical, heading, lateral) It is fixed by the base and bolts, and the direction of the axis of the actuator is ensured to be consistent with the three load directions to be loaded on the wheel axle 20; the displacement meter is fixed according to the test requirements, the measuring direction and measuring position of each displacement meter are checked and recorded, and a preliminary judgment is made as to whether the displacement of the measuring position will exceed the measuring range; the load is applied according to the corresponding working condition and the load application requirements of the task book, including heading load, vertical load and lateral load; after each structural loading test condition is completed, a photo is taken to record the state of the test piece. If there is no crack or damage on the test piece, the next working condition test is carried out until all working condition tests are completed.

[0029] The base of the actuator that realizes three directions (vertical, heading, and lateral) is a universal joint, and the end is a fisheye bearing, which can realize stable load loading and ensure that the load direction does not change under small deformation conditions; Figure 1 The support between the top beam 4 and the front beams 3 and 5 and the rear beams is in the form of studs, which can easily adjust the top beam height up and down, and provide support when the load direction changes, thereby improving the bearing capacity and stability of the structure;

[0030] like Figure 3 The dummy wheel fixture 10 shown adopts a double L vertical cross structure, and the two L-shaped parts are connected by welding. It can not only realize independent loading of loads in three directions of two loading points, but also rotate the dummy wheel fixture 10 90° to meet the load application of the test ground-spinning working condition; a dummy wheel fixture groove 27 is provided on one side of the dummy wheel fixture 10, which can ensure that the dummy wheel fixture 10 will not rotate around the axis of the wheel shaft 20 during the load loading process after being engaged with the machine wheel shaft 20.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A main landing gear structure load-bearing test device, comprising a test bench (1), a side beam (2), a front beam (3), a top beam (4) and a rear beam (5), characterized in that: The front beam (3) and the rear beam (5) are arranged at the front and rear ends of the test bench (1); the side beam (2) is arranged on a side of the test bench (1); the top beam (4) is installed at the top between the front beam (3) and the rear beam (5) and is arranged on the top of the test bench (1); a column clamp (7) is arranged on the test bench (1); a test piece (6) is clamped on the column clamp (7); a dummy wheel clamp (10) is installed on the test piece (6); and an action cylinder for acting on the dummy wheel clamp (10) is arranged on the top beam (4), the rear beam (5) and the side beam (2); A dummy wheel clamp groove (27) is machined on one side of the dummy wheel clamp. The dummy wheel clamp (10) adopts a double L-cross structure, which comprises a first L-shaped component (25) of the dummy wheel clamp and a second L-shaped component (26) of the dummy wheel clamp. The two L-shaped components are connected by welding. The first L-shaped component (25) of the dummy wheel clamp is also provided with a lateral load interface (16), a first vertical load interface (17), and a first ground rotation interface (18). The second L-shaped component (26) of the dummy wheel clamp is also provided with a first heading load interface (14), a second heading load interface (15), and a second vertical load interface (19).

2. A main landing gear structure load-bearing test device according to claim 1, characterized in that: The test piece (6) comprises a pillar (22), a retractable actuator cylinder (23), a wheel shaft (20), a resistance support rod (24) and a rotating sleeve (21); the pillar (22) is clamped and fixed on the pillar clamp (7) by a pillar clamp (7); the retractable actuator cylinder (23) is hinged to the pillar (22) and has a retractable actuator cylinder clamp (8) installed on the other end and is fixed to the test bench (1) through the retractable actuator cylinder clamp (8); the rotating sleeve (21) is sleeved on the pillar (22) and has its axis aligned with the pillar (22); the resistance support rod (24) is hinged to the rotating sleeve (21) and has a resistance support rod clamp (9) installed on the other end and is fixed to the test bench (1) through the resistance support rod clamp (9).

3. A main landing gear structure load-bearing test device according to claim 2, characterized in that: The dummy wheel fixture groove (27) on the dummy wheel fixture (10) is specifically mounted on the machine wheel shaft (20) in the test piece (6) to cooperate with the machine wheel shaft (20) to prevent the dummy wheel fixture (10) from rotating around the axis of the machine wheel shaft (20) after the dummy wheel fixture (10) is engaged with the machine wheel shaft (20).

4. A main landing gear structure load-bearing test device according to claim 1, characterized in that: The side beam (2), top beam (4) and rear beam (5) are respectively equipped with a lateral actuating cylinder (13), a vertical actuating cylinder (12) and a heading actuating cylinder (11); one end of the (11) is fixed to the rear beam (5) via a universal joint, and the other end is hinged to a first heading load interface (14) or a second heading load interface (15) of (10) via a fisheye bearing; one end of the vertical actuating cylinder (12) is fixed to the top beam (4) via a universal joint, and the other end is hinged to a first vertical load interface (17) or a second vertical load interface (19) of a dummy wheel fixture (10) via a fisheye bearing; one end of the lateral actuating cylinder (13) is fixed to the side beam (2) via a universal joint, and the other end is hinged to a lateral load interface (16) of the dummy wheel fixture (10) via a fisheye bearing.

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