Airplane sliding door pressure relief test device

Abstract

The utility model discloses an aircraft sliding door pressure relief test device, which comprises a clamping mechanism and an actuator, the clamping mechanism comprises a vertically arranged rectangular frame, a sliding door is vertically arranged in the rectangular frame, and an upper frame and a lower frame of the rectangular frame are respectively fixed on the upper side and the lower side of a framework of the sliding door. The left frame and the right frame of the rectangular frame do not make contact with the left side and the right side of the framework of the sliding door, the transmission end of the actuator acts on the pressure relief opening cover on one side on the plane in the heading direction of the sliding door to form a loading point, and the actuator loads and applies force to test whether the pressure relief opening cover is separated from the pressure relief lock at the opening value and is normally opened relative to the framework. On the basis of analysis of structural forms and pressure relief loads of the pressure relief opening cover and the pressure relief lock of the aircraft sliding door, the open test device is provided, a confined space pressing test is not needed, the actuator directly acts on the pressure relief opening cover of the sliding door to load and apply force, the test device can be repeatedly used, the test implementation process is easy to operate, and the test efficiency is improved. Test results are accurate, and test cost can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of aircraft sliding door testing devices, and in particular to an aircraft sliding door depressurization testing device. Background Art

[0002] On an airplane, sliding doors can be used to separate different compartments, such as those shown in the attached document. Figure 1 , 2 As shown, a pressure relief vent cover and a pressure relief lock are installed on the sliding door. When a hole appears in the aircraft cabin and causes a sudden drop in pressure, the pressure between the cabins is uneven. The pressure between the cabins can be quickly balanced by opening the pressure relief vent cover.

[0003] Taking into account both the pressure relief load and the aircraft's structural safety, the sliding door pressure relief cover was designed with a specific opening value. Since the functionality of the pressure relief cover affects flight safety, the feasibility of the pressure relief cover and pressure relief lock installation techniques needs to be verified through testing to ensure the structural integrity of the aircraft and the safety of passengers and crew.

[0004] Traditional pressure relief cover testing devices require the construction of a sealed partition space. Pressure is applied within this space to create a pressure difference between the inside and outside of the sliding door. When the pressure difference reaches the opening value, the pressure relief cover on the sliding door disengages from the pressure relief lock, and the pressure relief cover opens normally relative to the sliding door frame. Although this testing device is effective, it is relatively complex to build. Utility Model Content

[0005] Purpose of this utility model: The purpose of this application is to provide an aircraft sliding door depressurization test device that is robust in structure, easy to assemble, saves manpower and time, and at the same time ensures the accuracy and reliability of the test results.

[0006] Technical solution: A pressure relief test device for an aircraft sliding door, comprising a clamping mechanism and an actuator. The clamping mechanism includes a vertically placed rectangular frame, within which the sliding door is vertically placed. The upper and lower borders of the rectangular frame are respectively fixed to the upper and lower sides of the sliding door frame. The left and right borders of the rectangular frame do not contact the left and right sides of the sliding door frame. The transmission end of the actuator acts on a pressure relief port cover on one side of the sliding door in the yaw direction to form a loading point. The actuator applies force to test whether the pressure relief port cover disengages from the pressure relief lock and opens normally relative to the frame at the opening value.

[0007] Working principle: The upper and lower ends of the sliding door are fixed by the clamping mechanism, while the left and right sides are unrestrained. The actuator applies force to the pressure relief cover on one side to simulate the pressure difference between the cabins during actual flight. Based on the stable support of the clamping mechanism and the precise loading of the actuator, the test verifies whether the pressure relief cover disengages from the pressure relief lock and opens normally relative to the frame at the opening value. The test device structure is simplified, the pressure loading method is improved, and the test results are accurate.

[0008] Furthermore: the upper frame and the lower frame are each composed of two flat plates. The upper and lower sides of the sliding door frame are respectively clamped between the two flat plates. The upper and lower ends of the left frame and the right frame are respectively fixed between the two flat plates by screws. The upper and lower frames of the rectangular frame provide stable and reliable fixation for the sliding door, preventing it from shaking or falling off, and facilitating the disassembly and replacement of the test piece. The left and right frames do not constrain the sliding door and do not affect the fact that the pressure relief port cover can be opened automatically during the test.

[0009] Furthermore, the clamping mechanism also includes a base plate and diagonal braces. The lower frame is fixed to the base plate, and one diagonal brace is provided corresponding to the left frame and the right frame, respectively. The lower end of the diagonal brace is fixed to the base plate, and the upper end is fixed to the corresponding left frame or the right frame. The diagonal brace and the rectangular frame form a triangular support, which further enhances the stability and reliability of the clamping mechanism in fixing the sliding door. During the test, the applied force ensures that the sliding door does not shake.

[0010] Furthermore: the number of loading points is consistent with the number of pressure relief locks on one side of the pressure relief port cover, and the loading points correspond one-to-one with the pressure relief locks. When testing multiple loading points, the force can be evenly distributed on the sliding door to improve the accuracy of the test results. The loading points are located inside the pressure relief locks to further improve the accuracy of the test results.

[0011] Furthermore: a vertical square steel is provided on the transmission end of the actuator, and a horizontal fisheye rod is provided on the square steel. The number of fisheye rods is the same as the number of pressure relief locks. The front end of the fisheye rod acts on the pressure relief port cover to form the loading point. The combination structure of square steel and fisheye rods for multiple loading points can ensure that the test piece is loaded in a coordinated manner and that the loading force direction is always perpendicular to the test piece.

[0012] Furthermore, a push plate is provided at the front end of the fisheye rod, and the two are connected by a ball joint. The push plate acts on one side of the pressure relief port cover to form the loading point. When multiple loading points are loaded together, the ball joint connection allows the loading points to adapt to each other. The pressure relief lock corresponding to one loading point is opened. Due to the ball joint connection, the fisheye rod can rotate or swing relative to the push plate within a certain range at other loading points, so that the combination structure of square steel and fisheye rod has the required rigidity while also having a certain degree of flexibility.

[0013] Furthermore, the push plate forms a rectangle with one side surface of 110×45mm for the loading point, ensuring that the loading point and the pressure relief port cover have a certain contact area.

[0014] Furthermore, it also includes a test bench on which the actuator is horizontally mounted, and the test bench provides stable support for the entire test apparatus.

[0015] Beneficial effects: The advantages of this utility model are: based on the analysis of the structural form and pressure relief load of the pressure relief port cover and pressure relief lock of the aircraft sliding door, an open test device is provided, which does not require a closed space pressure test. The actuator directly acts on the pressure relief port cover of the sliding door to apply force. The test device can be reused, the test implementation process is easy to operate, and the test results are accurate, which helps to reduce test costs. Attached Figure Description

[0016] Figure 1 This is a sliding door, shown in the plane of the flight direction;

[0017] Figure 2 for Figure 1 The back;

[0018] Figure 3 This is a schematic diagram of the clamping mechanism in this utility model installed on a sliding door;

[0019] Figure 4 This is a schematic diagram of the structure for applying force to the sliding door in this utility model;

[0020] Figure 5 This is a schematic diagram of the loading point of the sliding door;

[0021] Figure 6 This is a schematic diagram showing the connection between the fisheye rod and the push plate, forming the loading point. DETAILED DESCRIPTION

[0022] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0023] An aircraft sliding door depressurization test device, as shown in the attached document. Figure 3 , 4 As shown, it includes a clamping mechanism 1, an actuator 2, and a platform 4.

[0024] The clamping mechanism 1 is used to fix the sliding door 5 of the test specimen. The clamping mechanism 1 includes a vertically placed rectangular frame 11, a base plate 12, and diagonal bracing rods 13. Specifically, the rectangular frame 11 is composed of an upper frame 111, a lower frame 112, a left frame 113, and a right frame 114. The upper frame 111 and the lower frame 112 are each composed of two flat plates 115. The base plate 12 is laid horizontally on the ground. The rectangular frame 11 is first fixed to the base plate 12 by one of the flat plates 115 of the lower frame 112. The outer frame of the sliding door 5, which serves as the supporting structure, is clamped between the two flat plates 115 of the upper frame 111 by the upper side of the frame and between the two flat plates 115 of the lower frame 112 by the lower side of the frame. The upper ends of the left frame 113 and the right frame 114 are fixed between the two flat plates 115 of the upper frame 111 by screws, and the lower ends are fixed between the two flat plates 115 of the lower frame 112 by screws. Within the rectangular frame 11, both are in the same vertical plane. The left frame 113 and the right frame 114 do not contact the left and right sides of the frame of the sliding door 5, so as not to affect the pressure relief cover from opening automatically during the test. The front of the sliding door 5 is the directional plane, which is used as the loading force side during the test. On the directional plane side, a diagonal brace 13 is installed at the left frame 113 and the right frame 114 respectively. The lower end of the diagonal brace 13 is fixed to the base plate 12, and the upper end is fixedly connected to the upper end of the corresponding left frame 113 and right frame 114 respectively. The base plate 12, the diagonal brace 13, and the rectangular frame 11 form a triangular support, which further enhances the stability and reliability of the clamping mechanism 1 in fixing the sliding door 5. Under the loading force during the test, it can be ensured that the sliding door 5 does not shake or fall off. The triangular support and the loading force are on the same side and do not conflict with the direction of the force. The clamping mechanism is convenient for disassembling and replacing the test piece.

[0025] The left and right pressure relief covers on the sliding door 5 are connected to the fixed shaft in the middle and rotate relative to each other. The pressure relief covers open relative to the left and right sides of the frame of the sliding door 5. The left pressure relief cover is locked to the left side of the frame through a pressure relief lock, and the right pressure relief cover is locked to the right side of the frame through a pressure relief lock.

[0026] As attached Figure 4 As shown, the platform 4 is fixed to the ground with anchor bolts and tightened with nuts. When disassembly is required, simply unscrew the nuts to remove the platform 4 from the ground, offering high flexibility. The actuator 2 is mounted on the platform 4, which provides stable support for the actuator 2. At the transmission end of the actuator 2, a vertical square steel bar 21 is installed, and several horizontal fisheye rods 22 are fixed to the square steel bar 21. The number of fisheye rods 22 is the same as the number of pressure relief locks on one side of the pressure relief port cover. Each fisheye rod corresponds to one pressure relief lock, as shown in the attached diagram. Figure 5 As shown, the front end of the fisheye rod 22 is located inside the pressure relief lock and contacts the pressure relief port cover to form a loading point 3. The attached figure shows four loading points.

[0027] During multiple loading points 3 tests, the load can be evenly distributed on the sliding door 5, improving the accuracy of the test results. The multiple loading points are achieved using a combination structure of square steel 21 and fisheye rod 22, which ensures coordinated loading of the test piece sliding door 5, while ensuring that the direction of the loading force is always perpendicular to the sliding door 5 to form a horizontal load.

[0028] As attached Figure 6 As shown, in order to more effectively distribute the load force evenly, a push plate 23 is arranged at the front end of the fisheye rod 22. The push plate 23 directly contacts the pressure relief port cover and forms a certain contact surface. The contact surface is a rectangle of 110×45mm. The fisheye rod 22 and the push plate 23 are connected by a ball joint. When multiple loading points 3 are loaded together, the ball joint connection allows each loading point 3 to adapt to each other. The pressure relief lock corresponding to one loading point 3 is opened. Due to the ball joint connection, the fisheye rod 22 can rotate or swing relative to the push plate 23 within a certain range at other loading points 3. This allows the combined structure of square steel 21 and fisheye rod 22 to have the required rigidity while also having a certain degree of flexibility.

[0029] During the test, without affecting the test results or reducing the test cycle, the right-side pressure relief port cover of the sliding door in the directional plane can be tested first. Force is applied to the pressure relief port cover by the actuator 2. During this process, the pressure is simultaneously distributed to their respective loading points 3 through the four fisheye rods 22. The four fisheye rods 22 simultaneously apply pressure to their respective loading points 3. When the pressure value exceeds the pressure relief lock opening value, if the pressure relief lock automatically unlocks and the pressure relief port cover opens free from the pressure relief lock, then the sliding door can meet the expected usage requirements. Conversely, if the pressure relief lock cannot unlock normally, or the pressure relief port cover fails to open free from the pressure relief lock, it means that the pressure relief lock or pressure relief port cover has a defect and cannot meet the expected usage requirements. If the right-side pressure relief port cover cannot complete the entire test, the left-side pressure relief port cover is selected for testing.

[0030] The aircraft sliding door pressure relief test device of this application, based on the analysis of the structural form and pressure relief load of the aircraft sliding door pressure relief port cover and pressure relief lock, provides an open test device that does not require a closed space pressure test. The actuator directly applies force to the pressure relief port cover of the sliding door, simulating the rapid release of cabin pressure, thereby verifying whether the pressure relief lock and pressure relief port cover meet the expected usage requirements. The test device is reusable, the test implementation process is easy to operate, the pressure loading method is improved, the test results are accurate, and it helps to reduce test costs.

Claims

1. A pressure relief test device for an aircraft sliding door, characterized in that: The device includes a clamping mechanism (1) and an actuator (2). The clamping mechanism (1) includes a vertically placed rectangular frame (11). The sliding door is vertically placed inside the rectangular frame (11). The upper frame (111) and lower frame (112) of the rectangular frame (11) fix the upper side and lower side of the frame of the sliding door, respectively. The left frame (113) and right frame (114) of the rectangular frame (11) do not contact the left side and right side of the frame of the sliding door. The transmission end of the actuator (2) acts on the pressure relief port cover on one side in the plane of the sliding door's yaw direction to form a loading point (3). The actuator (2) applies force to test whether the pressure relief port cover is disengaged from the pressure relief lock and opens normally relative to the frame at the opening value.

2. The aircraft sliding door depressurization test device according to claim 1, characterized in that: The upper frame (111) and the lower frame (112) are each composed of two flat plates (115). The upper and lower sides of the sliding door frame are respectively clamped between the two flat plates (115). The upper and lower ends of the left frame (113) and the right frame (114) are respectively fixed between the two flat plates (115) by screws.

3. The aircraft sliding door depressurization test device according to claim 1, characterized in that: The clamping mechanism (1) further includes a base plate (12) and a diagonal brace (13). The lower frame (112) is fixed on the base plate (12). One diagonal brace (13) is provided for each of the left frame (113) and the right frame (114). The lower end of the diagonal brace (13) is fixed to the base plate (12), and the upper end is fixed to the corresponding left frame (113) or right frame (114).

4. The aircraft sliding door depressurization test device according to claim 1, characterized in that: The number of loading points (3) is consistent with the number of pressure relief locks on one side of the pressure relief port cover. The loading points (3) correspond one-to-one with the pressure relief locks. The loading points (3) are located inside the pressure relief locks.

5. The aircraft sliding door depressurization test device according to claim 4, characterized in that: The actuator (2) has a vertical square steel (21) on its transmission end, and a horizontal fisheye rod (22) on the square steel (21). The number of fisheye rods (22) is the same as the number of pressure relief locks. The front end of the fisheye rod (22) acts on the pressure relief port cover to form the loading point (3).

6. The aircraft sliding door depressurization test device according to claim 5, characterized in that: The front end of the fisheye rod (22) is provided with a push plate (23), which is connected by a ball joint. The push plate (23) acts on one side of the pressure relief port cover to form the loading point (3).

7. The aircraft sliding door depressurization test device according to claim 6, characterized in that: The push plate (23) forms a rectangle with one side surface of the loading point (3) being 110×45mm.

8. The aircraft sliding door depressurization test device according to claim 1, characterized in that: It also includes a stand (4), on which the actuator (2) is horizontally mounted.

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