Light airplane nose wheel fatigue testing machine

Abstract

The utility model relates to the field of mechanical engineering and material testing, in particular to a light airplane nose wheel fatigue testing machine which comprises a main frame, a nose wheel assembly, a fixing plate, an air cylinder, a mounting plate, a sliding groove, a nose wheel frame, a controller, a supporting assembly and the like. The mounting plate is used for mounting the nose wheel assembly, a sliding groove is formed in the main frame, the mounting plate is slidably connected into the sliding groove, the lower end of the nose wheel assembly is connected with a nose wheel frame, the nose wheel frame is used for mounting nose wheels, a controller is mounted on the main frame and electrically connected with the air cylinder, and a supporting assembly is arranged at the lower end of the main frame and used for supporting the nose wheel assembly through the nose wheel frame. Through cooperation of the air cylinder and the sliding groove, automatic lifting and fatigue testing of the nose wheel assembly are achieved, the nose wheel assembly is supported through the supporting block, and through cooperation of the movable installation frame, installation of the nose wheel assembly is turned over.

Description

Technical Field

[0001] The utility model relates to the fields of mechanical engineering and material testing, in particular to a light aircraft nose wheel fatigue testing machine. Background Art

[0002] With the continuous advancement of aviation technology and the gradual opening up of low-altitude airspace, light aircraft are becoming an ideal choice for private flights, aerial photography, agricultural spraying, and short-distance transportation, and their market demand is growing. As a crucial component of the landing gear system, the nose wheel of a light aircraft directly bears the impact loads during takeoff and landing. Its performance stability and durability are crucial to flight safety. The nose wheel must not only have sufficient load-bearing capacity but also maintain excellent wear and fatigue resistance during frequent takeoffs and landings. Therefore, rigorous fatigue testing of light aircraft nose wheels is particularly important.

[0003] Currently, there are a variety of testing equipment for light aircraft nose wheels on the market, designed to simulate the complex operating conditions experienced by nose wheels during actual flight in order to evaluate their fatigue life. Among them, a test fixture for nose wheels of light sport aircraft, with publication number CN213632631U, includes a nose wheel test frame, a nose wheel mounting frame disposed within the test frame, pulley blocks compatible with the nose wheel test frame symmetrically disposed at both ends of the nose wheel mounting frame, a front nose wheel mounted at the lower end of the nose wheel mounting frame, a gear bar disposed at the front end of the nose wheel mounting frame, and a drive device disposed at the front end of the drive device, which has a partial gear meshing with the gear bar.

[0004] The test fixture's relatively complex frame structure makes pre-test installation of the aircraft nose wheel cumbersome and time-consuming. The complex mechanical structure also introduces additional friction and wear, affecting test accuracy and repeatability. This inconvenience is particularly pronounced in applications requiring frequent test object changes or large-scale testing, reducing test efficiency. Utility Model Content

[0005] In order to overcome the disadvantage that the nose wheel assembly is inconvenient to install, the utility model provides a light aircraft nose wheel fatigue testing machine.

[0006] A light aircraft nose wheel fatigue tester includes a main frame, a nose wheel assembly, a fixing plate, a cylinder, a mounting plate, a slide, a nose wheel frame, a controller and a support assembly. The main frame is connected to the fixing plate, the fixing plate is mounted with a cylinder, the piston rod of the cylinder is connected to the mounting plate, the mounting plate is used to mount the nose wheel assembly, the nose wheel assembly includes a hydraulic telescopic rod, a nose wheel frame, a nose wheel and corresponding connecting components, and the main frame is provided with a slide, the mounting plate is slidably connected in the slide, the lower end of the nose wheel assembly is connected to the nose wheel frame, the nose wheel frame is used to mount the nose wheel, the main frame is mounted with a controller, the controller is electrically connected to the cylinder, and the lower end of the main frame is provided with a support assembly for supporting the nose wheel assembly through the nose wheel frame.

[0007] Optionally, the support assembly includes a force frame, a support block, a guide block, an operating rod and a locking rod. The lower end of the main frame is slidably connected to the force frame, the front end of the force frame is connected to the support block, the support block contacts the top inner side of the nose wheel frame, the rear end of the force frame is connected to the guide block, the guide block is slidably connected to the operating rod, and two locking rods are connected to the operating rod. Multiple limiting holes are opened on the left and right sides of the main frame, and the two locking rods are respectively slidably connected to the limiting holes on one side of the main frame.

[0008] Optionally, a warning light is also included, and a warning light is installed on the top of the main frame.

[0009] Optionally, an identification card is further included. An identification card is set on the front side of the main frame, and the identification on the identification card corresponds to the position of the limit hole one by one.

[0010] Optionally, a handle is further included, and one end of the operating rod flush with the locking rod is connected to the handle for pushing and pulling the operating rod.

[0011] Optionally, fixed feet are also included, and a plurality of fixed feet are connected to the bottom of the main frame for supporting the main frame.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] Through the cooperation of the cylinder and the slide, the automatic lifting and fatigue testing of the nose wheel assembly is realized, which improves the test efficiency and accuracy. When installing the nose wheel assembly, it is supported by the support block and the movable mounting frame is used to install the nose wheel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of the fixing plate and the mounting plate of the utility model.

[0016] Figure 3 It is a schematic diagram of the three-dimensional structure of the locking rod and the operating rod of the utility model.

[0017] Explanation of the reference numerals: 1: main frame, 101: nose wheel assembly, 2: fixing plate, 3: cylinder, 4: mounting plate, 5: slide groove, 6: force frame, 7: support block, 701: nose wheel frame, 8: controller, 9: limiting hole, 10: guide block, 11: operating lever, 12: locking lever, 13: warning light, 14: identification card, 15: handle, 16: fixed foot. DETAILED DESCRIPTION

[0018] The following description is merely a preferred embodiment of the present invention and does not limit the scope of protection of the present invention.

[0019] Example: A light aircraft nose wheel fatigue tester, such as Figure 1-Figure 3 As shown, it includes a main frame 1, a nose wheel assembly 101, a fixed plate 2, a cylinder 3, a mounting plate 4, a slide 5, a nose wheel frame 701, a controller 8 and a support assembly. The main frame 1 is connected to the fixed plate 2, the fixed plate 2 is installed with the cylinder 3, the piston rod of the cylinder 3 is connected with the mounting plate 4, the mounting plate 4 is used to install the nose wheel assembly 101, the nose wheel assembly 101 includes a hydraulic telescopic rod, a nose wheel frame 701, a nose wheel and corresponding connecting parts, and the main frame 1 is provided with a slide 5, the mounting plate 4 is slidably connected in the slide 5, the lower end of the nose wheel assembly 101 is connected to the nose wheel frame 701, the nose wheel frame 701 is used to install the nose wheel, the main frame 1 is installed with the controller 8, the controller 8 is electrically connected to the cylinder 3, and the lower end of the main frame 1 is provided with a support assembly for supporting the nose wheel assembly 101 through the nose wheel frame 701.

[0020] like Figure 2 and Figure 3 As shown, the support assembly includes a force frame 6, a support block 7, a guide block 10, an operating rod 11 and a locking rod 12. The lower end of the main frame 1 is slidably connected to the force frame 6, the front end of the force frame 6 is connected to the support block 7, the support block 7 is in contact with the inner top of the nose wheel frame 701, the rear end of the force frame 6 is connected to the guide block 10, the guide block 10 is slidably connected to the operating rod 11, and the operating rod 11 is connected to two locking rods 12. A plurality of limiting holes 9 are opened on the left and right sides of the main frame 1, and the two locking rods 12 are respectively slidably connected to the limiting holes 9 on one side of the main frame 1.

[0021] Before testing the nose wheel assembly 101, the nose wheel needs to be removed, and then the nose wheel frame 701 is lifted onto the support block 7. The cylinder 3 is turned on by the controller 8 to push the mounting plate 4 downward, and the mounting plate 4 slides in the slide groove 5 until the bottom of the mounting plate 4 contacts the top of the nose wheel assembly 101. If the cylinder 3 still does not contact the nose wheel assembly 101 after it is fully lowered, the force frame 6 can be properly lifted to enable the nose wheel assembly 101 to better contact the mounting plate 4, and then the nose wheel assembly 101 and the mounting plate 4 are connected together by screws. According to the specific situation of the hydraulic telescopic rod in the nose wheel assembly 101, the height of the force frame 6 is adjusted. When the force frame 6 moves, it is necessary to push The operating rod 11 causes the locking rod 12 to leave the limiting hole 9, thereby releasing the restriction on the sliding of the force frame 6. The operating rod 11 slides along the guide block 10. A groove is provided in the guide block 10 to limit the operating rod 11 to slide left and right but not rotate. In this way, after adjusting the force frame 6, the operating rod 11 is pulled so that the locking rod 12 can be directly inserted into the limiting hole 9. There is no need to rotate to adjust the position of the locking rod 12. During the test, the cylinder 3 pushes the mounting plate 4 up and down, thereby continuously compressing the hydraulic telescopic rod to check the working condition of the hydraulic telescopic rod. After completing the test, the nose wheel assembly 101 is removed from the mounting plate 4, and the nose wheel frame 701 leaves the support block 7 and the nose wheel is installed.

[0022] like Figure 1 As shown, a warning light 13 is also included. The warning light 13 is installed on the top of the main frame 1. During the test, the controller 8 starts the warning light 13 to remind people passing by.

[0023] like Figure 1 As shown, an identification card 14 is also included. An identification card 14 is set on the front side of the main frame 1. The identification on the identification card 14 corresponds to the position of the limit hole 9. When adjusting the force frame 6, refer to the identification card 14, so that each time the adjustment is made, it is ensured that the operating rod 11 and the locking rod 12 can be aligned with the limit hole 9, reducing the number of fine-tuning times and saving time.

[0024] like Figure 1 As shown, a handle 15 is also included. The end of the operating rod 11 that is flush with the locking rod 12 is connected to the handle 15 for pushing and pulling the operating rod 11. The other end of the operating rod 11 is connected to the handle 15. When pulling out the operating rod 11, due to the pressure of the force frame 6, it is easier to pull out the locking rod 12 by applying force at both ends.

[0025] like Figure 1 As shown, it also includes fixed feet 16. A plurality of fixed feet 16 are connected to the bottom of the main frame 1 to support the main frame 1. The fixed feet 16 can reduce the impact of uneven ground on the testing process and prevent the situation where the main frame 1 may be unstable due to ground protrusions.

[0026] During the use of the light aircraft nose wheel fatigue tester, first, the nose wheel to be tested needs to be removed from the nose wheel assembly 101, and the nose wheel frame 701 is placed on the support block 7 of the support assembly. Then, the cylinder 3 is started by the controller 8, and the piston rod of the cylinder 3 pushes the mounting plate 4 to slide down smoothly along the slide groove 5 on the main frame 1 until the bottom of the mounting plate 4 contacts the top of the nose wheel assembly 101. If direct contact is not possible due to the stroke of the cylinder 3 or the height of the nose wheel assembly 101, it can be adapted by adjusting the height of the force frame 6 in the support assembly. This process requires pushing the operating rod 11 to disengage the locking rod 12 from the limiting hole 9 of the main frame 1, thereby allowing the force frame 6 to freely Slide, after the position adjustment of the force frame 6 is completed, pull the operating rod 11, and reinsert the locking rod 12 into the corresponding limit hole 9 to ensure that the force frame 6 is stable. Then, use screws to fix the nose wheel assembly 101 to the mounting plate 4. During the test, the controller 8 controls the reciprocating motion of the cylinder 3 to drive the mounting plate 4 and the nose wheel assembly 101 to move up and down, thereby simulating the compression and release of the nose wheel assembly 101 during takeoff and landing of the aircraft. Continuously observe and record the working status and fatigue of the hydraulic telescopic rod. After the test, close the cylinder 3, remove the connection between the nose wheel assembly 101 and the mounting plate 4, and remove the nose wheel frame 701 from the support block 7 to complete the reinstallation of the nose wheel.

[0027] In addition, the device is also equipped with a warning light 13, which automatically starts during the test and effectively reminds people around to pay attention to safety. The identification card 14 intuitively displays the position of the limit hole 9, which is convenient for quickly and accurately adjusting the height of the force frame 6 and improving operational efficiency. The design of the handle 15 allows the operating rod 11 to be easily pulled out when it is under pressure from the force frame 6, facilitating the unlocking and locking of the locking rod 12. The fixed foot 16 enhances the stability of the entire testing machine, reduces interference caused by uneven ground, and ensures the accuracy of the test results. Please check the logical errors and sentence incoherence in the above text. Please point out the logical errors and incoherent sentences.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A light aircraft nose wheel fatigue tester, characterized in that: The invention comprises a main frame (1), a nose wheel assembly (101), a fixing plate (2), a cylinder (3), a mounting plate (4), a slide (5), a nose wheel frame (701), a controller (8) and a support assembly, wherein the main frame (1) is connected with a fixing plate (2), a cylinder (3) is mounted on the fixing plate (2), a piston rod of the cylinder (3) is connected with a mounting plate (4), and the mounting plate (4) is used for mounting the nose wheel assembly (101), and the nose wheel assembly (101) comprises a hydraulic telescopic rod, a nose wheel frame ( 701), a nose wheel and corresponding connecting parts, and a slide groove (5) is opened on the main frame (1), the mounting plate (4) is slidably connected in the slide groove (5), the lower end of the nose wheel assembly (101) is connected to the nose wheel frame (701), the nose wheel frame (701) is used to install the nose wheel, a controller (8) is installed on the main frame (1), the controller (8) is electrically connected to the cylinder (3), and a support assembly is provided at the lower end of the main frame (1) for supporting the nose wheel assembly (101) through the nose wheel frame (701).

2. A light aircraft nose wheel fatigue tester according to claim 1, characterized in that: The support assembly comprises a force-bearing frame (6), a support block (7), a guide block (10), an operating rod (11) and a locking rod (12); the lower end of the main frame (1) is slidably connected to the force-bearing frame (6); the front end of the force-bearing frame (6) is connected to the support block (7); the support block (7) contacts the inner top of the nose wheel frame (701); the rear end of the force-bearing frame (6) is connected to the guide block (10); the guide block (10) is slidably connected to the operating rod (11); the operating rod (11) is connected to two locking rods (12); a plurality of limiting holes (9) are opened on the left and right sides of the main frame (1); and the two locking rods (12) are respectively slidably connected to the limiting holes (9) on one side of the main frame (1).

3. A light aircraft nose wheel fatigue tester according to claim 2, characterized in that: The utility model also comprises a warning light (13), and the warning light (13) is installed on the top of the main frame (1).

4. A light aircraft nose wheel fatigue tester according to claim 3, characterized in that: It also includes an identification card (14). The identification card (14) is provided on the front side of the main frame (1), and the identification on the identification card (14) corresponds to the position of the limiting hole (9) one by one.

5. A light aircraft nose wheel fatigue tester according to claim 4, characterized in that: The utility model further comprises a handle (15), and an end of the operating rod (11) flush with the locking rod (12) is connected with the handle (15) for pushing and pulling the operating rod (11).

6. A light aircraft nose wheel fatigue tester according to claim 5, characterized in that: It also includes fixed feet (16), and a plurality of fixed feet (16) are connected to the bottom of the main frame (1) for supporting the main frame (1).

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