Drop test bench

Abstract

The utility model provides a drop test bench. The drop test bed comprises a base plate, a stand column and a force measuring platform which are arranged on the base plate, a hanging basket bottom plate which ascends and descends along the stand column, a rail frame which is installed on the base plate, and a first environment chamber and a second environment chamber which are arranged on the rail frame in a sliding mode, and a clamp is arranged at the lower end of the hanging basket bottom plate. The force measuring platform is located beside the stand column, the first environment chamber and the second environment chamber slide close to each other or away from each other, and when the first environment chamber and the second environment chamber slide close to each other, the first environment chamber and the second environment chamber are in butt joint at the force measuring platform to form a closed box body. According to the utility model, the first environmental chamber and the second environmental chamber which are split are adopted, after the two environmental chambers are closed, a closed structure is formed outside the undercarriage, and different ladder temperature environments of-55 DEG C to 135 DEG C can be realized in the closed structure, so that the buffer characteristic of the undercarriage under extreme environmental conditions can be verified.

Description

Technical Field

[0001] This utility model relates to the field of landing gear testing technology, and in particular to a drop test bench. Background Technology

[0002] Before leaving the factory, aircraft landing gear undergoes drop testing. Existing drop testing benches include a base plate, a column and a force-measuring platform mounted on the base plate, a basket base plate sliding on the column, a basket connected to the basket base plate, and a lifting cylinder for driving the basket's lifting and lowering. A clamp for holding the landing gear is located at the lower end of the basket base plate. The base plate can be a plate placed on the ground or directly on the ground of the testing station. The force-measuring platform is located beside the column and below the landing gear. After the lifting cylinder raises the landing gear to a certain height, unlocking the lifting cylinder allows the landing gear to fall freely onto the force-measuring platform for the drop test. Current aircraft landing gear drop tests are typically conducted in a laboratory at room temperature. During the test, dynamic parameters such as load, displacement, pressure, and acceleration are measured to calculate and analyze whether the landing gear's strength, stiffness, and cushioning characteristics meet design requirements.

[0003] With technological advancements, the design and development of civil aircraft landing gear now requires drop tests to simulate extreme weather conditions that may be encountered during actual use, such as high and low temperatures. Drop tests are conducted on the landing gear under specific temperature conditions to verify whether the landing gear meets design requirements regarding overload, tire travel, and the strong cushioning performance of the landing gear structure under various extreme environments.

[0004] However, existing drop test benches cannot perform the above functions. Utility Model Content

[0005] The purpose of this invention is to provide a drop test bench that can simulate the high and low temperature test environment of landing gear, so as to verify whether the performance of landing gear under extreme climatic conditions meets the design requirements.

[0006] The technical solution of this utility model is: a drop test bench, including a base plate, a column and a force measuring platform disposed on the base plate, a basket bottom plate that moves up and down along the column, a track frame installed on the base plate, and a first environmental chamber and a second environmental chamber that are slidably disposed on the track frame. A clamp is provided at the lower end of the basket bottom plate. The force measuring platform is located beside the column. The first environmental chamber and the second environmental chamber slide close to each other or away from each other. When they slide close to each other, the first environmental chamber and the second environmental chamber dock at the force measuring platform to form a closed box.

[0007] In the above scheme, a split first and second environmental compartment is adopted. After the two environmental compartments are closed, a sealed structure is formed on the outside of the landing gear. The sealed structure can achieve different temperature levels from -55℃ to 135℃, so as to verify the buffering characteristics of the landing gear under extreme environmental conditions. Furthermore, the split first and second environmental compartments have the advantages of convenient loading and unloading of the landing gear and the ability to accommodate the enclosure and sealing of different landing gear models, thus improving versatility.

[0008] Preferably, both the first and second environmental cabins include a cabin body and a hatch that can be detachably installed on the top of the cabin body via a latch, wherein the cross-section of the hatch is an irregular shape adapted to the shape of the landing gear.

[0009] Preferably, a sealing gasket is provided on the upper surface of the cabin or the lower surface of the cabin cover.

[0010] Preferably, the top of the first environmental chamber is provided with a C-shaped first hole, and the top of the second environmental chamber is provided with a C-shaped second hole. When the first environmental chamber and the second environmental chamber are docked, the first hole and the second hole are docked to form a rectangular hole.

[0011] Preferably, a silicone block is provided in the rectangular hole.

[0012] Preferably, the second environmental chamber is equipped with a hook that can swing up and down, and the first environmental chamber is provided with a locking pin. After the first and second environmental chambers are docked, the hook is engaged with the locking pin.

[0013] Preferably, the second environmental chamber is provided with a cylinder and a guide pin. The extension rod of the cylinder is connected to the hook, and the hook is provided with a guide groove that matches the guide pin. The cylinder extends and retracts to drive the hook to engage or disengage from the locking pin.

[0014] Preferably, the lower ends of both the first and second environmental chambers are provided with casters adapted to the track frame and motors for driving the casters.

[0015] Preferably, a mechanical room is provided on the side of the second environmental chamber away from the first environmental chamber.

[0016] Preferably, an observation window is provided on the side wall of the first environmental chamber.

[0017] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0018] 1. The drop test bench adopts a split first and second environmental chamber. After the two environmental chambers are closed, a sealed structure is formed on the outside of the landing gear. The sealed structure can achieve different temperature levels from -55℃ to 135℃, so as to verify the buffering characteristics of the landing gear under extreme environmental conditions.

[0019] 2. The drop test bench adopts a split first and second environmental chamber. On the one hand, the opening and closing method facilitates the clamping and disassembly of the landing gear. On the other hand, it can adapt to the enclosure and sealing of different models of landing gear, and has higher versatility.

[0020] Third, after the first and second environmental chambers are docked, hooks and locking pins are used to limit their position and achieve safe locking to prevent them from separating during the test.

[0021] IV. The environmental compartment adopts a separate structure of the compartment body and the canopy, and the canopy can be replaced with a suitable one according to the shape of a certain type of landing gear, thereby further improving versatility. Attached Figure Description

[0022] Figure 1 A partial cross-sectional schematic diagram of the drop test bench provided by this utility model, with the first environmental chamber and the second environmental chamber in a closed state;

[0023] Figure 2 for Figure 1 A structural schematic diagram of the first environmental chamber, the second environmental chamber, and the track frame;

[0024] Figure 3 A schematic diagram of the structure of the drop test bench provided by this utility model, with the first and second environmental chambers in an open state;

[0025] Figure 4 for Figure 3 A structural diagram of the first environmental chamber, the second environmental chamber, and the track frame.

[0026] In the attached diagram: 1. Base plate; 101. T-shaped slide; 2. Column; 3. Base plate of the basket; 4. Fixture; 5. Machinery room; 6. Motor; 7. Moving wheel; 8. Force measuring platform; 9. Track frame; 10. First environmental chamber; 11. Second environmental chamber; 12. Cylinder; 13. Guide pin; 14. Hook; 141. Guide groove; 15. Locking pin; 102. Cabin body; 103. Cabin cover; 104. Sealing gasket; 105. Fastener; 106. First hole; 107. Second hole; 111. Observation window; 100. Landing gear. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0028] like Figure 1As shown, the drop test bench provided in this embodiment includes a base plate 1, a column 2, a hanging basket base plate 3, a clamp 4, a force measuring platform 8, a track frame 9, a first environmental chamber 10, a second environmental chamber 11, a cylinder 12, a guide pin 13, a hook, a locking pin 15, a moving wheel 7, a motor 6, and a mechanical chamber 5.

[0029] The substrate 1 is placed on the ground of the test station, and a plurality of T-shaped grooves 101 are arranged in its width direction. The T-shaped grooves 101 extend through both ends of the substrate 1 in the length direction.

[0030] The column 2 is fixed to the base plate 1, and the column 2 is located beside the T-shaped slide groove 101 in the width direction. Two columns 2 are arranged at intervals in the length direction of the base plate 1. The two columns 2 are adapted to the bottom plate 3 of the basket via slide rails.

[0031] The lower end of the basket base plate 3 is provided with clamps 4. There are multiple clamps 4, which respectively clamp the support rods, actuators, and other parts on the landing gear 100. Different clamps 4 can be replaced to adapt to the clamping of different models of landing gear 100.

[0032] The force measuring platform 8 is installed on the T-shaped slide groove 101 by T-bolts, so that the force measuring platform 8 is located below the tires of the landing gear 100.

[0033] like Figure 2 As shown, the track frame 9 is a rectangular frame with multiple supports (unnumbered) at its lower end. These supports are mounted on the T-shaped groove 101 using T-bolts. The force-measuring platform 8 passes through the track frame 9, with its force-measuring surface extending above the track frame 9. Figure 4 As shown, the track frame 9 can be constructed by splicing multiple small rectangular frames. Limit switches are installed on the track frame 9 to determine the opening and closing positions of the first and second environmental chambers, ensuring the reliability and safety of the executed actions and equipment. The track frame 9 is detachable from the base plate 1 and can be disassembled, moved, or removed after the test is completed.

[0034] The two sides extending along the length of the track frame 9 are used to accommodate the moving wheels 7. The moving wheels 7 are provided at the bottom of both the first environmental chamber 10 and the second environmental chamber 11, and the moving wheels 7 are driven by the motor 6.

[0035] like Figure 4As shown, both the first environmental cabin 10 and the second environmental cabin 11 include a cabin body 102 and a canopy 103 detachably mounted on the top of the cabin body 102 via a latch 105. The cross-section of the canopy 103 is an irregular shape adapted to the shape of the landing gear 100. By making the cabin body 102 into a standard structure, different models of landing gear 100 can be adapted by replacing different canopies 103, thus improving versatility. A sealing gasket 104 is provided between the cabin body 102 and the canopy 103, and the sealing gasket 104 is provided on the upper surface of the cabin body 102 or the lower surface of the canopy 103.

[0036] An observation window 111 is provided on the side wall of the first environmental chamber 10. The motor 6 drives the first environmental chamber 10 and the second environmental chamber 11 to slide closer together to form a closed state (e.g., ...). Figure 1 , Figure 2 (as shown) or they slide away from each other to form an open state (such as...) Figure 3 , Figure 4 (As shown). When they slide close to each other, the first environmental chamber 10 and the second environmental chamber 11 dock at the force measuring platform 8 to form a closed box, and the contact surfaces of the two environmental chambers are sealed by extrusion with silicone strips. The silicone strips can be set on the interface of any one of the environmental chambers or on the interface of both environmental chambers.

[0037] The top of the first environmental chamber 10 is provided with a C-shaped first hole 106, and the top of the second environmental chamber 11 is provided with a C-shaped second hole 107. When the first environmental chamber 10 and the second environmental chamber 11 are docked, the first hole 106 and the second hole 107 are docked to form a rectangular hole. Figure 1 As shown, the rectangular hole passes through the connection between the upper end of the landing gear 100 and the clamp. After installation, the rectangular hole is sealed with a solid silicone block that has been irregularly shaped and then ground and adjusted on-site to achieve a compressed and sealed state for the housing.

[0038] The drop test bench is equipped with a temperature control system (such as a heating module and a cooling module, which are purchased externally). The closed chamber forms an internal working environment of -55℃ to +135℃ through the heating module or the cooling module, and can provide a stable temperature environment. It can be removed from the drop test area during drop data testing.

[0039] A locking pin 15 is provided on the side wall of the first environmental chamber 10. A cylinder 12 and a guide pin 14 are provided on the side wall of the second environmental chamber 11. The cylinder 12 extends and retracts horizontally, and a hook 14 is hinged to its extension rod. The hook 14 is provided with a guide groove 141. The guide pin 14 is located on the trajectory of the hook 14 swinging up and down, and the guide groove 141 is adapted to the guide pin 14. When the cylinder 12 extends and retracts, it drives the hook 14 to swing up and down to engage or disengage from the locking pin 15. After the hook 14 is engaged with the locking pin 15, the locking pin 15 can be pulled back by retracting the extension rod of the cylinder 12, so that the first environmental chamber 10 and the second environmental chamber 11 are tightly connected and the chambers are effectively closed.

[0040] The split structure of the first environmental chamber 10 and the second environmental chamber 11 can adapt to high and low temperature environment drop tests of landing gear with different structures, and confirm the climate adaptability of the landing gear under different temperature conditions by changing the simulated environmental conditions to test the relevant parameters of the drop test of the landing gear under different temperature conditions.

[0041] The second environmental chamber 11 has a mechanical room 5 located on the side away from the first environmental chamber 10.

[0042] The drop test rig includes two operating modes: a simulated environment mode and a drop test mode. In the simulated environment mode, the rig receives temperature simulation requirements from the drop test rig. The landing gear is in a preset position and locked. The first environmental chamber 10 and the second environmental chamber 11 perform the combined aircraft's temperature rise and fall actions. Temperature sensors can be installed in the environmental chambers. During the temperature rise and fall process, the sensing signals from these sensors are sent to the controller, which then sends corresponding commands.

[0043] When the ambient temperature reaches the preset value, cooling or heating stops. The controller unlocks cylinder 12 and hook 14, and controls motor 6 to move, causing the first environmental chamber 10 and the second environmental chamber 11 to slide away from each other to achieve an open state (e.g., Figure 3 When the controller receives the first environmental chamber 10 and the second environmental chamber 11 and they are in the open sliding position, it issues a command to execute the drop test, so that the landing gear 100 falls freely and impacts the force measuring platform 8.

[0044] This invention employs a first environmental chamber 10 and a second environmental chamber 11 that open and close in a split manner. When closed, they enclose the landing gear to simulate high and low temperature drop tests. During the test, the lifting cylinder of the drop test bench confines the basket to a set height and locks it. After the first environmental chamber 10 and the second environmental chamber 11 are closed, the through-hole temperature control system heats or cools the air to simulate different ambient temperatures. The compressor unit in the temperature control system is controlled to maintain a temperature arbitrarily set between -55℃ and +135℃ for 2 hours, allowing the internal temperature of the landing gear to reach a stable state at the test set temperature. Then, the environmental chambers are opened, and the drop test is conducted.

[0045] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A drop test bench, comprising a base plate, a column and a force measuring platform disposed on the base plate, and a suspended basket base plate that moves up and down along the column, wherein a clamp is provided at the lower end of the suspended basket base plate, and the force measuring platform is located beside the column, characterized in that, It also includes a track frame mounted on the base plate and a first environmental chamber and a second environmental chamber slidably disposed on the track frame. The first environmental chamber and the second environmental chamber slide close to each other or far away from each other. When they slide close to each other, the first environmental chamber and the second environmental chamber dock at the force measuring platform to form a closed box.

2. The drop test bench according to claim 1, characterized in that, Both the first and second environmental cabins include a cabin body and a hatch that can be detachably installed on the top of the cabin body via a latch. The hatch has an irregular cross-section adapted to the shape of the landing gear.

3. The drop test bench according to claim 2, characterized in that, A sealing gasket is provided on the upper surface of the cabin or the lower surface of the hatch.

4. The drop test bench according to claim 1, characterized in that, The top of the first environmental chamber is provided with a C-shaped first hole, and the top of the second environmental chamber is provided with a C-shaped second hole. When the first environmental chamber and the second environmental chamber are docked, the first hole and the second hole are docked to form a rectangular hole.

5. The drop test bench according to claim 4, characterized in that, A silicone block is provided in the rectangular hole.

6. The drop test bench according to claim 1, characterized in that, The second environmental chamber is equipped with a hook that can swing up and down, and the first environmental chamber is equipped with a locking pin. After the first and second environmental chambers are docked, the hook is engaged with the locking pin.

7. The drop test bench according to claim 6, characterized in that, The second environmental chamber is equipped with a cylinder and a guide pin. The extension rod of the cylinder is connected to the hook, and the hook is provided with a guide groove that matches the guide pin. The cylinder extends and retracts to drive the hook to engage or disengage from the locking pin.

8. The drop test bench according to claim 1, characterized in that, The lower ends of both the first and second environmental chambers are equipped with casters adapted to the track frame and motors for driving the casters.

9. The drop test bench according to claim 1, characterized in that, The mechanical room is located on the side of the second environmental chamber away from the first environmental chamber.

10. The drop test bench according to claim 1, characterized in that, The first environmental chamber has observation windows on its side walls.

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