Static pressure curve test device for undercarriage buffer strut

Abstract

The utility model discloses an undercarriage buffer strut static pressure curve test device, which comprises a base table, a static pressure table and a lifting mechanism, the static pressure table is arranged above the base table and can move up and down relative to the base table, the lifting mechanism is arranged on the base table, and the lifting mechanism is provided with a stroke detection device and a pressure detection device. The lifting mechanism is used for arranging the buffering supporting column and driving the buffering supporting column to move towards the static pressure table. The buffering supporting column is arranged on the lifting mechanism, the structure is simple, the buffering supporting column does not need to be fixed through a clamp, the buffering supporting column is convenient and fast to assemble and disassemble, and the lifting mechanism controls the buffering supporting column to stably ascend and descend. A pressure curve and related test data of the buffer strut can be obtained through the stroke detection device and the pressure detection device, and a static pressure curve graph of the buffer strut can be accurately drawn.

Description

Technical Field

[0001] The utility model belongs to the technical field of static pressure curve test equipment, and in particular relates to a static pressure curve test device for a landing gear buffer strut. Background Art

[0002] The landing gear is an important part of the aircraft. It is used to support the weight of the aircraft, bear the corresponding load, and can consume and absorb the impact energy of the aircraft during landing and taxiing. It has an extremely important mission during the take-off, taxiing and landing of the aircraft, and plays a very important role in ensuring the safety of the aircraft. The quality of its working performance and the level of its reliability directly affect the usability and safety of the aircraft. It absorbs the impact kinetic energy of the aircraft when landing and plays a shock-absorbing role when taxiing on the ground. Whether the landing gear can work reliably requires the static compression curve diagram of the buffer strut to be drawn for verification. Only after it meets the design requirements can it be delivered for installation. Therefore, the compliance of the drawn static pressure curve diagram (also known as the power diagram) is very important to ensure the safety of the aircraft.

[0003] The static pressure curve test of the landing gear buffer strut is a method for testing the performance of the buffer strut in a static state. It evaluates the performance of the buffer strut by simulating the stress conditions of the landing gear buffer strut during takeoff, landing and taxiing of the aircraft. The existing static pressure curve test of the landing gear buffer strut mainly includes a static pressure test system, a sensor, a data acquisition device and a test fixture. The buffer strut is first installed on the test fixture, and pressure is applied to the buffer strut through the static pressure test system, and the pressure curve and related data are recorded. The existing static pressure curve test of the landing gear buffer strut has a complex structure, is cumbersome to operate, and has low test efficiency. Utility Model Content

[0004] The utility model aims to provide a landing gear buffer strut static pressure curve test device, which is used to solve the above problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a landing gear buffer strut static pressure curve test device, including a base platform, a static pressure platform and a lifting mechanism, the static pressure platform is arranged above the base platform and can be raised and lowered relative to the base platform, the lifting mechanism is arranged on the base platform, the lifting mechanism is equipped with a stroke detection device and a pressure detection device, and the lifting mechanism is used to set the buffer strut and drive the buffer strut to move toward the static pressure platform.

[0006] As an optional implementation of the above technical solution, a lifting mechanism is provided between the static pressure platform and the base platform, and the lifting mechanism is used to drive the static pressure platform to move up and down relative to the base platform.

[0007] As an optional implementation of the above technical solution, the lifting mechanism includes a screw, a screw sleeve, a driving wheel, a transmission assembly and a driving assembly. The screw is installed on the base platform, the screw sleeve is threadedly connected to the screw, one end of the screw sleeve is rotatably connected to the static pressure platform, and the driving wheel is set at the other end of the screw sleeve, and the driving assembly is connected to the driving wheel through the transmission assembly.

[0008] As an optional implementation of the above technical solution, the lead angle of the trapezoidal external thread on the surface of the screw rod is smaller than the equivalent friction angle, and the lead angle of the trapezoidal internal thread on the inner wall of the screw rod sleeve is smaller than the equivalent friction angle.

[0009] As an optional implementation of the above technical solution, the driving assembly includes an electric driving component and a manual driving component, and both the electric driving component and the manual driving component are connected to the driving wheel through a transmission assembly.

[0010] As an optional implementation of the above technical solution, the driving wheel includes a turbine, and the turbine sleeve is arranged on the outside of the screw sleeve.

[0011] As an optional implementation of the above technical solution, the transmission assembly includes a transmission shaft and a worm sleeve, the worm sleeve is arranged on the transmission shaft and meshes with the turbine, and the electric drive member and the manual drive member are both connected to the transmission shaft.

[0012] As an optional implementation of the above technical solution, the electric drive component includes a drive motor, and a pulley assembly is connected between the drive motor and the transmission shaft.

[0013] As an optional implementation of the above technical solution, the pulley assembly includes a driving wheel, a driven wheel and a transmission belt, the driving wheel is arranged on the output shaft of the driving motor, the driven wheel is arranged on the transmission shaft, and the transmission belt is arranged between the driving wheel and the driven wheel.

[0014] As an optional implementation of the above technical solution, the manual drive member includes a driving hand wheel, and the driving hand wheel is arranged at the end of the transmission shaft.

[0015] As an optional implementation of the above technical solution, the lifting mechanism includes a servo hydraulic cylinder, and the pressure detection device is arranged between the servo hydraulic cylinder and the base platform.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides a landing gear buffer strut static pressure curve test device, which has a simple structure, does not need a clamp to fix the buffer strut, and is convenient and quick to install and disassemble. In addition, a lifting mechanism controls the buffer strut to perform a smooth lifting action. The pressure curve and related test data of the buffer strut can be obtained through a stroke detection device and a pressure detection device, which is beneficial to accurately draw a static pressure curve diagram of the buffer strut. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a landing gear buffer strut static pressure curve test device in one embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a screw rod in one embodiment of the utility model;

[0020] Figure 3 It is a structural schematic diagram of a screw sleeve and a turbine in one embodiment of the utility model;

[0021] Figure 4 It is a usage state diagram of a landing gear buffer strut static pressure curve test device in one embodiment of the utility model.

[0022] In the figure: 1-base platform; 2-static pressure platform; 3-stroke detection device; 4-pressure detection device; 5-buffer support; 6-screw; 7-screw sleeve; 8-turbine; 9-transmission shaft; 10-worm sleeve; 11-drive motor; 12-driving wheel; 13-driven wheel; 14-transmission belt; 15-drive hand wheel; 16-servo hydraulic cylinder. DETAILED DESCRIPTION

[0023] like Figure 1-Figure 4 As shown, this embodiment provides a landing gear buffer pillar static pressure curve test device, including a base platform 1, a static pressure platform 2 and a lifting mechanism, wherein the buffer pillar 5 is arranged on the lifting mechanism, and the lifting mechanism can carry the buffer pillar 5 to move up and down. The static pressure platform 2 is arranged above the base platform 1 and can move up and down relative to the base platform 1, and the buffer pillar 5 is located between the static pressure platform 2 and the lifting mechanism. The lifting mechanism is arranged on the base platform 1, and the lifting mechanism is equipped with a stroke detection device 3 and a pressure detection device 4. The lifting mechanism is used to set the buffer pillar 5 and drive the buffer pillar 5 to move toward the static pressure platform 2. During the test, the buffer pillar 5 is placed on the lifting mechanism, and the static pressure platform 2 needs to adjust its position so that the bottom of the static pressure platform 2 contacts the top of the buffer pillar 5, and then the static pressure platform 2 is kept fixed, and the buffer pillar 5 is driven to move upward by the lifting mechanism, so that the buffer pillar 5 is compressed, and the stroke detection device 3 can detect the stroke of the lifting mechanism, that is, the compression amount of the buffer pillar 5, and the pressure detection device 4 can detect the pressure generated by the buffer pillar 5 on the lifting mechanism, and obtain the pressure curve of the buffer pillar 5 and related test data.

[0024] The utility model arranges the buffer pillar 5 on the lifting mechanism, which has a simple structure and does not require a clamp to fix the buffer pillar 5. The installation and disassembly of the buffer pillar 5 are convenient and quick, and the lifting mechanism controls the buffer pillar 5 to perform a smooth lifting action. The pressure curve and related test data of the buffer pillar 5 can be obtained through the stroke detection device 3 and the pressure detection device 4, which is conducive to accurately drawing the static pressure curve diagram of the buffer pillar 5.

[0025] like Figure 1 As shown, in this embodiment, the lifting mechanism includes a servo hydraulic cylinder 16, and the pressure detection device 4 is arranged between the servo hydraulic cylinder 16 and the base platform 1. A buffer support 5 is arranged on the top of the servo hydraulic cylinder 16, and the buffer support 5 is controlled by the servo hydraulic cylinder 16 to lift and lower, and the control is stable and the control accuracy is high. The stroke detection device 3 can use a displacement sensor to obtain the piston rod stroke of the buffer support 5. The pressure detection device 4 uses a pressure sensor, which is arranged between the servo hydraulic cylinder 16 and the base platform 1, and can obtain the pressure on the buffer support 5.

[0026] Among them, a lifting mechanism is provided between the static pressure platform 2 and the base platform 1, and the lifting mechanism is used to drive the static pressure platform 2 to move up and down relative to the base platform 1, so that the bottom of the static pressure platform 2 contacts the top of the buffer support 5, which is convenient for the static pressure curve test.

[0027] In one embodiment, the lifting mechanism includes a screw 6, a screw sleeve 7, a driving wheel, a transmission assembly and a driving assembly. The screw 6 is installed on the base platform 1. The screw sleeve 7 is threadedly connected to the screw 6. One end of the screw sleeve 7 is rotatably connected to the static pressure platform 2. The other end of the screw sleeve 7 is provided with the driving wheel, and the driving assembly is connected to the driving wheel through the transmission assembly. Two screws 6 are provided on the base platform 1, and two screw sleeves 7 are correspondingly provided on the static pressure platform 2. The screw sleeve 7 is rotatably connected to the static pressure platform 2 through a bearing. The screw sleeve 7 can rotate relative to the static pressure platform 2, and the screw sleeve 7 can lift and lower the static pressure platform 2. The driving wheel is fixedly provided on the screw sleeve 7, and the driving assembly drives the driving wheel to rotate through the transmission assembly. The driving wheel and the screw sleeve 7 rotate together to realize the lifting and lowering of the static pressure platform 2.

[0028] Preferably, the lead angle of the trapezoidal external thread on the surface of the screw rod 6 is smaller than the equivalent friction angle, and the lead angle of the trapezoidal internal thread on the inner wall of the screw rod sleeve 7 is smaller than the equivalent friction angle. Figure 1 and Figure 2 As shown, two screw rods 6 are fixed on the base, and a trapezoidal external thread is provided on the upper part of the screw rod 6. The thread lead angle of the trapezoidal external thread is smaller than the equivalent friction angle. A trapezoidal internal thread matching the thread of the screw rod 6 is provided inside the screw rod sleeve 7. The thread lead angle of the trapezoidal internal thread is smaller than the equivalent friction angle, so that the transmission of the screw rod 6 and the screw rod sleeve 7 has a self-locking function.

[0029] Specifically, the driving assembly includes an electric driving member and a manual driving member, and the electric driving member and the manual driving member are both connected to the driving wheel through the transmission assembly. The static pressure platform 2 can be quickly raised and lowered by the electric driving member, and can also be manually fine-tuned and raised by the manual driving member. The utility model uses the electric driving member to roughly adjust the position of the static pressure platform 2, and then uses the manual driving member to fine-tune the position of the static pressure platform 2, which is conducive to improving the accuracy of the static pressure curve test of the buffer pillar 5.

[0030] like Figure 3 As shown, in one embodiment, the driving wheel includes a turbine 8, and the turbine 8 is sleeved on the outside of the screw sleeve 7. The bottom of the screw sleeve 7 is connected to the static pressure table 2 through a bearing, and the turbine 8 is arranged on the top of the screw sleeve 7. The turbine 8 is driven to rotate by the action of the transmission assembly and the driving assembly, so that the screw sleeve 7 and the turbine 8 rotate together.

[0031] Specifically, the transmission assembly includes a transmission shaft 9 and a worm sleeve 10, the worm sleeve 10 is arranged on the transmission shaft 9 and meshes with the turbine 8, the electric drive and the manual drive are both connected to the transmission shaft 9, and the electric drive and the manual drive can drive the transmission shaft 9 to rotate, the worm sleeve 10 on the transmission shaft 9 meshes with the turbine 8, thereby driving the screw sleeve 7 to rotate.

[0032] Wherein, the electric drive member includes a driving motor 11, and a pulley assembly is connected between the driving motor 11 and the transmission shaft 9. The pulley assembly includes a driving wheel 12, a driven wheel 13 and a transmission belt 14, wherein the driving wheel 12 is arranged on the output shaft of the driving motor 11, the driven wheel 13 is arranged on the transmission shaft 9, and the transmission belt 14 is arranged between the driving wheel 12 and the driven wheel 13. The manual drive member includes a driving handwheel 15, and the driving handwheel 15 is arranged at the end of the transmission shaft 9. The driving handwheel 15 can manually drive the transmission shaft 9 to rotate, and the driving motor 11 drives the transmission shaft 9 to rotate through the pulley assembly. The transmission combination of the turbine 8 and the worm sleeve 10 and the transmission combination of the screw 6 and the screw sleeve 7 have a large transmission ratio, and the driving motor 11 does not need other deceleration mechanisms. The lifting and lowering of the static pressure platform 2 in the utility model has electric adjustment and manual adjustment functions. The electric adjustment can roughly adjust the position of the static pressure platform 2, and the manual adjustment can fine-tune the position of the static pressure platform 2, so that the static pressure curve test of the buffer pillar 5 is more accurate.

[0033] When the landing gear buffer strut static pressure curve test device of the utility model is used, the equipment is first assembled, the static pressure platform 2 is quickly raised to a high position by the driving motor 11, and the buffer strut 5 is placed on the servo hydraulic cylinder 16; the static pressure platform 2 is quickly lowered to a position close to the buffer strut 5 by the driving motor 11, and the driving hand wheel 15 is turned to fine-tune the position of the buffer strut 5 and the static pressure platform 2 until the static pressure platform 2 and the buffer strut 5 are in contact. When the driving motor 11 and the driving hand wheel 15 both stop rotating, the static pressure platform 2 is securely fixed on the screw 6 by the self-locking of the turbine 8 and the worm sleeve 10 and the self-locking of the screw 6 and the screw sleeve 7, and the servo hydraulic cylinder 16 applies a steady pressure to the buffer strut 5 according to the set program, so that the buffer strut 5 moves upward, and at the same time, the pressure sensor and the displacement sensor transmit the measured data to the background computer for processing.

[0034] According to the requirements of the buffer support 5 test procedure, it is necessary to draw the stroke curve of the piston rod relative to the outer cylinder of the buffer support 5 under different static pressures. The buffer support 5 is installed on the static pressure curve test equipment. As the piston rod stroke increases, the pressure in the buffer support 5 cavity increases, and the static pressure of the buffer support 5 increases. The stiffness of the equipment, the convenience of installing the buffer support 5, and the stability of the piston rod stroke are the biggest constraints of the static pressure curve test.

[0035] The utility model adopts two large-section screw rods 6 as the columns of the equipment frame, which form a gantry frame structure after connecting the static pressure platform 2. The rigidity of the whole device is high. The static pressure platform 2 can be quickly lifted and lowered by electric means, or manually fine-tuned. The installation and operation of the buffer support 5 are convenient and reliable. The servo hydraulic cylinder 16 can smoothly control the lifting and lowering of the buffer support 5 with high control accuracy, so that the static pressure curve of the buffer support 5 can be accurately drawn.

[0036] In the description of the present utility model, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. In the absence of mutual contradictions, those skilled in the art may combine the features of different embodiments. The scope of protection of the present utility model is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present utility model, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the scope of protection of the present utility model.

Claims

1. A landing gear buffer strut static pressure curve test device, characterized in that: The invention comprises a base platform (1), a static pressure platform (2) and a lifting mechanism, wherein the static pressure platform (2) is arranged above the base platform (1) and can be lifted and lowered relative to the base platform (1), and the lifting mechanism is arranged on the base platform (1). The lifting mechanism is equipped with a stroke detection device (3) and a pressure detection device (4), and the lifting mechanism is used to set a buffer support (5) and drive the buffer support (5) to move toward the static pressure platform (2).

2. The landing gear buffer strut static pressure curve test device according to claim 1, characterized in that: A lifting mechanism is provided between the static pressure platform (2) and the base platform (1), and the lifting mechanism is used to drive the static pressure platform (2) to move up and down relative to the base platform (1).

3. The landing gear buffer strut static pressure curve test device according to claim 2, characterized in that: The lifting mechanism comprises a screw rod (6), a screw rod sleeve (7), a driving wheel, a transmission assembly and a driving assembly. The screw rod (6) is mounted on a base platform (1). The screw rod sleeve (7) is threadedly connected to the screw rod (6). One end of the screw rod sleeve (7) is rotatably connected to the static pressure platform (2). The driving wheel is arranged at the other end of the screw rod sleeve (7). The driving assembly is connected to the driving wheel through the transmission assembly.

4. The landing gear buffer strut static pressure curve test device according to claim 3, characterized in that: The lead angle of the trapezoidal external thread on the surface of the screw rod (6) is smaller than the equivalent friction angle, and the lead angle of the trapezoidal internal thread on the inner wall of the screw rod sleeve (7) is smaller than the equivalent friction angle.

5. The landing gear buffer strut static pressure curve test device according to claim 3, characterized in that: The driving assembly includes an electric driving member and a manual driving member, and both the electric driving member and the manual driving member are connected to the driving wheel through a transmission assembly.

6. The landing gear buffer strut static pressure curve test device according to claim 5, characterized in that: The driving wheel comprises a turbine (8), and the turbine (8) is sleeved on the outside of the screw sleeve (7).

7. The landing gear buffer strut static pressure curve test device according to claim 6, characterized in that: The transmission assembly comprises a transmission shaft (9) and a worm sleeve (10); the worm sleeve (10) is arranged on the transmission shaft (9) and meshes with the turbine (8); and the electric drive component and the manual drive component are both connected to the transmission shaft (9).

8. The landing gear buffer strut static pressure curve test device according to claim 7, characterized in that: The electric drive component comprises a driving motor (11), a pulley assembly is connected between the driving motor (11) and a transmission shaft (9); the pulley assembly comprises a driving wheel (12), a driven wheel (13) and a transmission belt (14), the driving wheel (12) is arranged on the output shaft of the driving motor (11), the driven wheel (13) is arranged on the transmission shaft (9), and the transmission belt (14) is arranged between the driving wheel (12) and the driven wheel (13).

9. The landing gear buffer strut static pressure curve test device according to claim 7, characterized in that: The manual drive member comprises a driving hand wheel (15), and the driving hand wheel (15) is arranged at the end of the transmission shaft (9).

10. The landing gear buffer strut static pressure curve test device according to claim 1, characterized in that: The lifting mechanism comprises a servo hydraulic cylinder (16), and the pressure detection device (4) is arranged between the servo hydraulic cylinder (16) and the base platform (1).

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