Main landing gear breaking and separating pin coordinated loading test device

Abstract

The invention belongs to the technical field of airplane structure strength tests, and particularly relates to a main landing gear breaking and separating pin coordinated loading test device. The device comprises an upper loading platform assembly (1) which is supported on a lower supporting platform assembly (7) through a circular column supporting rod (2); the breaking and separating pin switching tool (4) comprises a vertical loading single-lug tool (401) and a double-lug supporting tool (403), a single-lug piece of the vertical loading single-lug tool (401) is connected with a double-lug piece of the double-lug supporting tool (403) through a breaking and separating pin (402), and the double-lug supporting tool (403) is fixed to the lower supporting platform assembly (7); the vertical loading assembly (3) is fixed below the upper loading platform assembly (1), and the bottom of the vertical loading assembly (3) is connected with a vertical loading single-lug tool (401); the horizontal loading assembly (5) is connected to the two ends of the double-lug supporting tool (403) in the axial direction of the breaking pin (402). According to the invention, the loading precision is improved, and the test result is more reliable.

Description

Technical Field

[0001] This application belongs to the technical field of aircraft structural strength tests, and particularly relates to a coordinated loading test device for the main landing gear disconnect pin. Background Art

[0002] For the emergency disconnect safety pin at the rear intersection of the civil aircraft main landing gear, in terms of its connection form, it is subjected to both axial bi-directional coordinated loading of the disconnect pin and the shear load of the landing gear. During the structural design process, it is necessary to ensure the integrity of the disconnect pin before the design load, and at the same time, it is required to break and fail within the designed disconnect range. To assess the disconnect load of the emergency disconnect safety pin at the rear intersection of the main landing gear under radial load and the static strength load under axial and radial bi-directional loads, disconnect tests and static strength tests need to be carried out. During the tests, it is necessary to simulate the force and boundary conditions of the disconnect pin body in the landing gear structure. How to more realistically simulate the force and boundary conditions of the emergency disconnect safety pin at the rear intersection of the main landing gear in the airframe has become a key factor in such tests.

[0003] When designing the test piece, the emergency disconnect safety pin at the rear intersection of the civil aircraft main landing gear is selected as a typical unit of the joint. During the test, horizontal bi-directional coordinated loading and vertical tensile / compressive loads need to be applied, and the support is simulated according to the boundary conditions in the airframe structure. So far, no relatively mature loading device has been found. Summary of the Invention

[0004] To solve the above problems, this application provides a coordinated loading test device for the main landing gear disconnect pin, which is used for the support and loading of the static and fatigue tests of the emergency disconnect pin at the rear intersection of the main landing gear.

[0005] The coordinated loading test device for the main landing gear disconnect pin provided by this application mainly includes:

[0006] An upper loading platform assembly, which is supported on a lower support platform assembly through a circular column support rod;

[0007] A disconnect pin transfer tooling, which includes a vertical loading single-ear tooling and a double-ear support tooling. The single-ear piece of the vertical loading single-ear tooling is connected to the double-ear pieces of the double-ear support tooling through a disconnect pin, and the double-ear support tooling is fixed on the lower support platform assembly;

[0008] A vertical loading assembly, which is fixed below the upper loading platform assembly and is connected to the vertical loading single-ear tooling at the bottom;

[0009] A horizontal loading assembly, which is connected to both ends of the double-ear support tooling along the axial direction of the disconnect pin.

[0010] Preferably, the upper loading platform assembly includes an upper loading platform, connecting bolts, and round column fixed bases. The round column fixed bases are located at the four corners of the upper loading platform and are connected to the round column support rods through the connecting bolts.

[0011] Preferably, through holes penetrating the platform board surface are provided on the upper loading platform for connection with the vertical loading single ear of the vertical loading assembly.

[0012] Preferably, the vertical loading assembly includes a vertical loading single ear, a vertical loading actuator, and an actuator extension sleeve. The vertical loading single ear is connected to the bottom double ears of the vertical loading actuator through a pin shaft. The output end of the vertical loading actuator is connected to the actuator extension sleeve, and the other end of the actuator extension sleeve is used for connection with the vertical loading single ear tooling of the disconnection pin transfer tooling.

[0013] Preferably, the double ear support tooling is fixed on the lower support platform assembly through a transfer tooling fixed base. The transfer tooling fixed base includes a support single ear base and a fixed support single ear bottom beam. The support single ear base has an ear piece and a bottom plate. The ear piece is used for bolt connection with the double ear support tooling. The base is connected to the fixed support single ear bottom beam through a connecting bolt, and the fixed support single ear bottom beam is used for connection on the lower support platform of the lower support platform assembly.

[0014] Preferably, the horizontal loading assembly includes a horizontal actuator support angle box and a horizontal actuator. The horizontal actuator support angle box is fixed on the lower support platform through bolts. The horizontal actuator is fixed on the horizontal actuator support angle box through a horizontal actuator support single ear, and the output end of the horizontal actuator is connected to the double ear support tooling through bolts.

[0015] Preferably, oval long holes are provided on the lower support platform for adjusting the position of the horizontal actuator support angle box. The horizontal actuator support angle box fixes the horizontal loading anti-slip angle box through bolts. After the horizontal actuator support angle box is adjusted in place, the horizontal loading anti-slip angle box is fastened on the lower support platform through bolts.

[0016] Preferably, an actuator conversion sleeve, a sleeve connection double ear, a loading direction conversion flat plate, and a loading direction double ear are sequentially connected to the output end of the horizontal loading assembly.

[0017] This application realizes the coordinated loading and support of radial tension compression and axial bidirectional tension of the disconnection pin, improves the loading accuracy, and the test results are more reliable. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a preferred embodiment of the coordinated loading test device for the disconnection pin of the main landing gear of this application.

[0019] Figure 2Schematic diagram of the structure of the upper loading platform component

[0020] Figure 3 Structural diagram of the vertical loading component

[0021] Figure 4 Structural diagram of the disconnect pin adapter tool

[0022] Figure 5 Structural diagram of the horizontal loading component

[0023] Figure 6 Structural diagram of the fixed base of the adapter tool

[0024] Figure 7 Structural diagram of the lower support platform component Detailed implementation mode

[0025] To make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation modes of this application will be described in more detail below in conjunction with the accompanying drawings in the implementation modes of this application. In the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The described implementation modes are part of the implementation modes of this application, rather than all of the implementation modes. The implementation modes described below by referring to the accompanying drawings are exemplary and are intended to explain this application, and should not be construed as a limitation of this application. Based on the implementation modes in this application, all other implementation modes obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. The implementation modes of this application will be described in detail below in conjunction with the accompanying drawings.

[0026] This application provides a main landing gear disconnect pin coordinated loading test device, as Figures 1 - 7 shown, mainly including:

[0027] The upper loading platform component 1 is supported on the lower support platform component 7 by the circular column support rod 2;

[0028] The disconnect pin adapter tool 4 includes a vertical loading single-ear tool 401 and a double-ear support tool 403. The single-ear piece of the vertical loading single-ear tool 401 is connected to the double-ear pieces of the double-ear support tool 403 by the disconnect pin 402, and the double-ear support tool 403 is fixed on the lower support platform component 7;

[0029] The vertical loading component 3 is fixed below the upper loading platform component 1, and the bottom is connected to the vertical loading single-ear tool 401;

[0030] The horizontal loading component 5 is connected to both ends of the double-ear support tool 403 along the axial direction of the disconnect pin 402.

[0031] In this application, the axial load of the break-off pin is first transferred to the double-ear support tooling 403 by the break-off pin transfer tooling 4, and the radial load is transferred to the vertical loading single-ear tooling 401. During the test, the vertical loading single-ear tooling 401 is connected to the vertical loading assembly 3, and a radial tensile / compressive load is applied to the break-off pin 402. At the same time, a two-way tensile coordinated load is applied to the double-ear support tooling 403 through the horizontal loading assembly 5, realizing the radial tensile / compressive loading and axial two-way tensile coordinated loading of the break-off pin.

[0032] In this application, the actual force on the break-off pin is decomposed into the radial load of the vertical loading single-ear tooling 401 and the axial load of the double-ear support tooling 403 by the break-off pin transfer tooling 4, and a two-way loading platform is designed for loading, improving the loading accuracy.

[0033] In some alternative embodiments, as Figure 2 shown, the upper loading platform assembly 1 includes an upper loading platform 101, connecting bolts 102, and circular column fixed bases 3. The circular column fixed bases 3 are located at the four corners of the upper loading platform 101 and are connected to the circular column support rods 2 through the connecting bolts 102.

[0034] In this embodiment, the upper loading platform assembly 1 is an integrally welded structure. The upper loading platform 101 is connected to the circular column fixed bases 701 of the lower support platform assembly 7 through four circular column support rods 2, as Figure 7 shown, and then connected to the lower support platform 702 to form the vertical loading main body.

[0035] In some alternative embodiments, through holes penetrating the platform board surface are provided on the upper loading platform 101 to connect with the vertical loading single-ear 301 of the vertical loading assembly 3. In this embodiment, through holes are designed and the sufficient stiffness of the upper loading platform 101 during the loading process is ensured.

[0036] In some alternative embodiments, as Figure 3 shown, the vertical loading assembly 3 includes a vertical loading single-ear 301, a vertical loading actuator 303, and an actuator extension sleeve 304. The vertical loading single-ear 301 is connected to the bottom double-ears of the vertical loading actuator 303 through a pin shaft 302. The output end of the vertical loading actuator 303 is connected to the actuator extension sleeve 304, and the other end of the actuator extension sleeve 304 is used to connect with the vertical loading single-ear tooling 401 of the break-off pin transfer tooling 4.

[0037] In this embodiment, the actuator extension sleeve 304 and the vertical loading actuator 303 are first installed, and then the whole is installed on the vertical loading single-ear 301, and finally fixed on the upper loading platform 101 through 8 bolts.

[0038] In some alternative embodiments, the binaural support tooling 403 is fixed to the lower support platform assembly 7 through an adapter tooling fixed base 6, as Figure 6 shown. The adapter tooling fixed base 6 includes a single-ear support base 601 and a fixed single-ear support bottom beam 603. The single-ear support base 601 has lugs and a bottom plate. The lugs are used for bolt connection with the binaural support tooling 403. The base is connected to the fixed single-ear support bottom beam 603 through a connection bolt 602. The fixed single-ear support bottom beam 603 is used to connect to the lower support platform 702 of the lower support platform assembly 7.

[0039] In some alternative embodiments, as Figure 5 shown, the horizontal loading assembly 5 includes a horizontal actuator support angle box 501 and a horizontal actuator 503. The horizontal actuator support angle box 501 is fixed to the lower support platform 702 by bolts. The horizontal actuator 503 is fixed to the horizontal actuator support angle box 501 through a horizontal actuator support single ear 502. The output end of the horizontal actuator 503 is connected to the binaural support tooling 403 by bolts.

[0040] In some alternative embodiments, as Figure 7 shown, elliptical long slots are provided on the lower support platform 702 for adjusting the position of the horizontal actuator support angle box 501. The horizontal actuator support angle box 501 fixes a horizontal loading anti-slip angle box 508 by bolts. After the horizontal actuator support angle box 501 is adjusted in place, the horizontal loading anti-slip angle box 508 is fastened to the lower support platform 702 by bolts.

[0041] In this embodiment, the lower support platform 702 is configured with elliptical long slots to adjust and ensure the center of pressure of the test piece. When installing the entire device, first connect the upper loading platform assembly 1 and the lower support platform assembly 7 through the circular column support rod 2. Subsequently, install the vertical loading assembly 3 on the upper loading platform 1. Determine the dimensions on the lower support platform assembly 7, install the horizontal loading assembly 5 and the adapter tooling fixed base 6 on the lower support platform assembly 7. Finally, determine the position of the center of pressure of the disconnection pin, install the disconnection pin adapter tooling 4 on the adapter tooling fixed base 6, and connect the disconnection pin adapter tooling 4 and the vertical loading assembly 3 by bolts, and install the horizontal loading assembly 5. Thus, the installation is completed.

[0042] In some alternative embodiments, the output end of the horizontal loading assembly 5 is sequentially connected with an actuator conversion sleeve 504, a sleeve connection binaural 505, a loading direction conversion flat plate 506, and a loading direction binaural 507.

[0043] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.

Claims

1. A main landing gear disconnect pin coordinated loading test device, characterized in that: include: An upper loading platform assembly (1) is supported on a lower supporting platform assembly (7) via a round column support rod (2); The disconnect pin transfer tool (4) comprises a vertical loading single-ear tool (401) and a double-ear support tool (403), wherein the single-ear piece of the vertical loading single-ear tool (401) and the double-ear piece of the double-ear support tool (403) are connected via a disconnect pin (402), and the double-ear support tool (403) is fixed on the lower support platform component (7); A vertical loading component (3) is fixed below the upper loading platform component (1), and the bottom is connected to a vertical loading single-ear tooling (401); The horizontal loading assembly (5) is connected to both ends of the double-ear supporting tooling (403) along the axial direction of the disconnecting pin (402).

2. The main landing gear disconnect pin coordinated loading test device according to claim 1, characterized in that: The upper loading platform assembly (1) comprises an upper loading platform (101), connecting bolts (102) and a circular column fixing base (3); the circular column fixing base (3) is located at the four corners of the upper loading platform (101) and is connected to the circular column support rod (2) via the connecting bolts (102).

3. The main landing gear disconnect pin coordinated loading test device according to claim 2, characterized in that: The upper loading platform (101) is provided with a through hole penetrating the platform surface so as to be connected to the vertical loading single ear (301) of the vertical loading assembly (3).

4. The main landing gear disconnect pin coordinated loading test device according to claim 1, characterized in that: The vertical loading assembly (3) comprises a vertical loading single ear (301), a vertical loading actuator (303) and an actuator extension sleeve (304); the vertical loading single ear (301) is connected to the bottom double ears of the vertical loading actuator (303) via a pin shaft (302); the output end of the vertical loading actuator (303) is connected to the actuator extension sleeve (304); and the other end of the actuator extension sleeve (304) is used to be connected to the vertical loading single ear tooling (401) of the disconnect pin adapter tooling (4).

5. The main landing gear disconnect pin coordinated loading test device according to claim 1, characterized in that: The double-ear support tooling (403) is fixed on the lower support platform assembly (7) via a transfer tooling fixed base (6); the transfer tooling fixed base (6) comprises a supporting single-ear base (601) and a fixed supporting single-ear bottom beam (603); the supporting single-ear base (601) comprises an ear piece and a bottom plate; the ear piece is used for bolting with the double-ear support tooling (403); the base is connected to the fixed supporting single-ear bottom beam (603) via a connecting bolt (602); the fixed supporting single-ear bottom beam (603) is used for connecting to the lower support platform (702) of the lower support platform assembly (7).

6. The main landing gear disconnect pin coordinated loading test device according to claim 1, characterized in that: The horizontal loading assembly (5) comprises a horizontal actuator support corner box (501) and a horizontal actuator (503); the horizontal actuator support corner box (501) is fixed to the lower support platform (702) by bolts; the horizontal actuator (503) is fixed to the horizontal actuator support corner box (501) by a horizontal actuator support single ear (502); and the output end of the horizontal actuator (503) is connected to a double-ear support tooling (403) by bolts.

7. The main landing gear disconnect pin coordinated loading test device according to claim 6, characterized in that: The lower supporting platform (702) is provided with an elliptical long hole for adjusting the position of the horizontal actuator supporting corner box (501). The horizontal actuator supporting corner box (501) is fixed to the horizontal loading anti-skid corner box (508) by bolts. After the horizontal actuator supporting corner box (501) is adjusted into place, the horizontal loading anti-skid corner box (508) is fastened to the lower supporting platform (702) by bolts.

8. The main landing gear disconnect pin coordinated loading test device according to claim 6, characterized in that: The output end of the horizontal loading component (5) is sequentially connected to an actuator conversion sleeve (504), sleeve connecting ears (505), a loading direction conversion plate (506), and loading direction ears (507).

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