Counterweight device for undercarriage test

Abstract

The utility model relates to the field of undercarriage testing, in particular to a counterweight device for undercarriage testing, which comprises an undercarriage, a support frame, an air cylinder, a connecting block, a controller, a fixing component and the like, the air cylinder is mounted on the support frame, a piston rod of the air cylinder faces downwards and is connected with the connecting block, the controller is mounted on the support frame and is electrically connected with the air cylinder, and the fixing component is electrically connected with the air cylinder. The top of the undercarriage makes contact with the connecting block, and a fixing assembly is arranged at the bottom of the connecting block and used for fixing the undercarriage to the bottom of the connecting block. Through cooperation of the connecting block and the supporting plate, the undercarriage is firmly fixed to the bottom of the air cylinder, the piston rod of the air cylinder stably moves downwards, a load test is carried out, loading and unloading are not needed, the test time is saved, direct reading can be achieved through the controller, data can be conveniently and timely obtained, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of landing gear testing, in particular to a weight device for landing gear testing. Background Art

[0002] As a key supporting component during the takeoff and landing of an aircraft, the performance of the landing gear is directly related to the safety and stability of the aircraft. During the design, manufacturing, and maintenance of an aircraft, strict load testing of the landing gear is an essential part. By simulating the stress conditions under different working conditions, the strength, durability, and reliability of the landing gear can be evaluated to ensure that it can still maintain good working conditions under extreme conditions.

[0003] The patent with the publication number CN216846861U proposed a main landing gear heavy load testing device. This device innovatively uses a traveling crane system and a sliding square frame filled with sandbags. By controlling the free up and down vertical movement of the sliding square frame within the test frame, a gravity load simulation test of the main landing gear is achieved. This design not only reduces the complexity of manual operation but also improves the test efficiency through mechanized means. It is a technical solution with reasonable design and helpful for reducing the test difficulty.

[0004] However, the loading and unloading process of sandbags still takes a certain amount of time and requires professional operation, which affects the continuity and efficiency of the test. Secondly, the entire test device is relatively large in size and occupies a lot of space, increasing the deployment difficulty and cost for a test environment with limited space. Moreover, as a load medium, the risk of sandbag damage cannot be ignored. Once the sandbag ruptures, it will not only affect the accuracy of the test but also bring the trouble of cleaning work. In addition, the existing device lacks a direct reading function for the load during the test process and requires additional instruments for monitoring, increasing the test steps and complexity and being unfavorable for quickly and accurately obtaining test results. Summary of the Utility Model

[0005] In order to overcome the disadvantages of low loading and unloading efficiency and inconvenient reading, the utility model provides a weight device for landing gear testing.

[0006] A weight device for landing gear testing includes a landing gear, a support frame, a cylinder, a connecting block, a controller, and a fixing component. A cylinder is installed on the support frame. The piston rod of the cylinder faces downward and is connected to a connecting block. A controller is installed on the support frame, and the controller is electrically connected to the cylinder. The top of the landing gear contacts the connecting block, and a fixing component is arranged at the bottom of the connecting block for fixing the landing gear to the bottom of the connecting block.

[0007] More preferably, the fixing component includes a support plate, a vertical bearing, a fixing block, a fixing screw and a slider. The support plate is slidably connected to the connecting block through the sliders connected to both sides. Vertical bearings are connected to the left and right sides of the connecting block, fixing blocks are connected to the left and right sides of the support plate, the top of the fixing screw is rotatably connected to the vertical bearing, and the middle is threadedly connected to the fixing block.

[0008] More preferably, it further includes an auxiliary roller. The front end of the support frame is connected with an auxiliary roller for supporting and aligning when fixing the landing gear.

[0009] More preferably, it further includes a foam pad. Foam pads are connected to the top inside of the connecting block and the top of the support plate.

[0010] More preferably, it further includes a warning light. The warning light is connected to the support frame.

[0011] More preferably, it further includes a scale. The scale is arranged on the side of the connecting block.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] Through the cooperation of the connecting block and the support plate, the landing gear is firmly fixed at the bottom of the cylinder. The piston rod of the cylinder moves smoothly downward for load testing. There is no need to load and unload materials, saving testing time. The controller can directly read the data, facilitating timely data acquisition and improving the detection efficiency. 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 three-dimensional structure diagram of the cylinder and the connecting block of the utility model.

[0016] Figure 3 It is a three-dimensional structure diagram of the fastening screw and the support plate of the utility model.

[0017] The labels of each component in the drawings are as follows: 1, landing gear; 2, support frame; 3, cylinder; 4, connecting block; 5, support plate; 6, controller; 7, vertical bearing; 8, fixing block; 9, fixing screw; 10, slider; 11, scale; 12, foam pad; 13, warning light; 14, auxiliary roller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Those of ordinary skill in the art will recognize that terms such as "above", "below", "upward", "downward", etc. are used to describe the drawings and do not represent a limitation on the scope of the present utility model defined by the appended claims. Any numerical labels such as "first" or "second" are merely illustrative and are not intended to limit the scope of the present utility model in any way.

[0019] Embodiment: A counterweight device for landing gear testing, as Figures 1 - 3 shown, includes a landing gear 1, a support frame 2, a cylinder 3, a connecting block 4, a controller 6 and a fixing assembly. The cylinder 3 is installed on the support frame 2, its piston rod faces downward and is connected to the connecting block 4. A controller 6 is installed on the support frame 2, and the controller 6 is electrically connected to the cylinder 3. The top of the landing gear 1 contacts the connecting block 4, and a fixing assembly is provided at the bottom of the connecting block 4 for fixing the landing gear 1 to the bottom of the connecting block 4. The fixing assembly and the connecting block 4 clamp the landing gear 1. The staff transports the landing gear 1 to be tested near the support frame 2, keeps the top of the landing gear 1 in a horizontal state, inserts it into the connecting block 4, and then fixes the landing gear 1 through the fixing assembly to ensure that the landing gear 1 is stably installed. After confirming that the landing gear 1 is safely fixed, the cylinder 3 is started through the controller 6. The piston rod of the cylinder 3 moves downward to apply a preset load to the landing gear 1, simulating the force condition of the landing gear 1 in actual use. Observe and record the deformation, displacement or other performance indicators of the landing gear 1 under the action of the load, and at the same time check for any abnormal sounds or leaks. According to the test requirements, the load magnitude or duration of the cylinder 3 can be adjusted to conduct multiple rounds of tests. After the test is completed, the movement of the cylinder 3 is stopped through the controller 6, and the load is slowly released to release the landing gear 1 from the fixing assembly, remove the landing gear 1 from the connecting block 4, and turn off the power supply of the controller 6.

[0020] As Figure 2 and Figure 3As shown in the figure, the fixing component includes a pallet 5, a vertical bearing 7, a fixing block 8, fixing screws 9 and a slider 10. The pallet 5 is slidably connected to the connecting block 4 through the sliders 10 connected to both sides. Vertical bearings 7 are connected to the left and right sides of the connecting block 4, and fixing blocks 8 are connected to the left and right sides of the pallet 5. The top of the fixing screw 9 is rotatably connected to the vertical bearing 7, and the middle part is threadedly connected to the fixing block 8. When the landing gear 1 is inserted between the connecting block 4 and the pallet 5, rotate the fixing screw 9. By threaded connection, the fixing block 8 is extruded, thereby pushing the pallet 5 to move upward. The pallet 5 slides at the bottom of the connecting block 4 through the sliders 10. The fixing screws 9 on both sides are rotated alternately until the landing gear 1 is firmly clamped between the pallet 5 and the connecting block 4.

[0021] As Figure 1 shown in the figure, it further includes an auxiliary roller 14. The auxiliary roller 14 is snap-connected to the front end of the support frame 2 and is used to support the landing gear 1 when fixing it. When fixing the landing gear 1, the auxiliary roller 14 is snap-connected to the support frame 2. When the landing gear 1 moves and is inserted between the connecting block 4 and the pallet 5, it can support the top of the landing gear 1, facilitating the top to maintain a horizontal state. When testing, remove the auxiliary roller 14 from the support frame 2 to release the support for the landing gear 1 without affecting the load test of the landing gear 1.

[0022] As Figure 3 shown in the figure, it further includes a foam pad 12. The foam pad 12 is connected to the inner top of the connecting block 4, and the foam pad 12 is connected to the top of the pallet 5. The landing gear 1 is slowly placed on the foam pad 12 of the pallet 5. After tightening the fixing screw 9, its top also contacts the foam pad 12 on the connecting block 4, eliminating the stress concentration or eccentric loading phenomenon that may occur due to uneven component manufacturing caused by processing technology problems. The foam pad 12 can effectively relieve the problems brought by this unevenness, making the contact more uniform, and can also protect the surface of the landing gear 1 from scratches or indentations and other damages.

[0023] As Figure 1 shown in the figure, it further includes a warning light 13. The warning light 13 is connected to the support frame 2.

[0024] As Figure 3 shown in the figure, it further includes a scale 11. The scale 11 is provided on the side of the connecting block 4.

[0025] When testing, the warning light 13 is turned on accordingly to remind people passing by to pay attention to safety. The scale 11 is used as a reference when tightening the fixing screws 9. After tightening the fixing screws 9 on both sides, whether due to other problems, such as the inclination of the landing gear 1, etc., resulting in different heights on both sides of the pallet 5. The staff should check whether the heights on both sides of the pallet 5 are the same to ensure that the landing gear 1 is firmly clamped and not inclined.

[0026] During the landing gear 1 test, the staff first ensure that the landing gear 1 is horizontally placed on the foam pad 12 of the pallet 5 near the support frame 2 and contacts the foam pad 12 on the connecting block 4 to evenly disperse the pressure and protect the surface of the landing gear 1. Subsequently, the landing gear 1 is firmly clamped between the pallet 5 and the connecting block 4 by rotating the fixing screw 9, and the auxiliary roller 14 is used to assist in maintaining the top level (removed during the test). Before the test starts, the staff will remove the auxiliary roller 14 to ensure that it does not affect the load test of the landing gear 1. During the test, the controller 6 activates the cylinder 3 to apply a preset load to the landing gear 1 to simulate the actual use force condition, and observe and record the performance indicators and abnormalities. After the test is completed, the load is released and the landing gear 1 is removed. Throughout the process, the warning light 13 is turned on to ensure safety, and the scale 11 is used as a reference for tightening the fixing screw 9 to help detect potential problems, such as the inclination of the landing gear 1, etc.

[0027] Although the present disclosure has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above embodiments, but should be determined not only by the appended claims but also by the equivalents of the appended claims.

Claims

1. A counterweight device for landing gear testing, characterized in that It includes a landing gear (1), a support frame (2), a cylinder (3), a connecting block (4), a controller (6) and a fixing component. The support frame (2) is equipped with a cylinder (3). The piston rod of the cylinder (3) faces downward and is connected to a connecting block (4). The support frame (2) is equipped with a controller (6), and the controller (6) is electrically connected to the cylinder (3). The top of the landing gear (1) contacts the connecting block (4), and a fixing component is provided at the bottom of the connecting block (4) for fixing the landing gear (1) to the bottom of the connecting block (4).

2. The counterweight device for landing gear testing according to claim 1, characterized in that, The fixing component includes a support plate (5), a vertical bearing (7), a fixing block (8), a fixing screw (9) and a slider (10). The support plate (5) is slidably connected to the inside of the connecting block (4) through the sliders (10) connected to both sides. Vertical bearings (7) are connected to the left and right sides of the connecting block (4). Fixing blocks (8) are connected to the left and right sides of the support plate (5). The top of the fixing screw (9) is rotatably connected to the vertical bearing (7), and the middle is threadedly connected to the fixing block (8).

3. The counterweight device for landing gear testing according to claim 2, characterized in that, It further includes an auxiliary roller (14). The front end of the support frame (2) is connected to an auxiliary roller (14) for supporting and aligning when fixing the landing gear (1).

4. A counterweight device for landing gear testing according to claim 3, characterized in that, It further includes a foam pad (12). A foam pad (12) is connected to the inner top of the connecting block (4), and a foam pad (12) is connected to the top of the support plate (5).

5. The counterweight device for landing gear testing according to claim 4, characterized in that, It further includes a warning light (13). A warning light (13) is connected to the support frame (2).

6. A counterweight device for landing gear testing according to claim 5, characterized in that, It further includes a scale (11). A scale (11) is provided on the side of the connecting block (4).

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