Dedicated test fixture for aircraft float valves

Abstract

This utility model discloses a special testing fixture for aircraft float valves, belonging to the field of aviation equipment technology. The float fixing plate and base plate are connected by support rods to form a frame structure. The float valve is mounted on the float fixing plate, which is equipped with a viewing window and a level. A steel ruler is fixed to the side of the float fixing plate, and feet are installed at the four corners of the base plate. In use, the special testing fixture is placed in the existing oil tank in the factory, utilizing the existing hydraulic and electrical systems. The feet are adjusted until the float fixing plate is level, and the oil level is observed through the steel ruler. This utility model enables functional testing of the float valve after maintenance, ensuring the quality of aircraft float valve maintenance and guaranteeing the continuity of the aircraft's hydraulic system oil circuits.

Description

Technical Field

[0001] This utility model belongs to the field of aviation equipment technology and relates to a special test fixture for aircraft float valves. Background Technology

[0002] The float valve controls the opening and closing of the hydraulic circuit in an aircraft. According to the maintenance process requirements for a certain type of aircraft, a functional test of the float valve is required after maintenance. The float valve is installed in the test oil tank, and kerosene with a pressure not exceeding 59 kPa is introduced into the guide port. The float gradually rises until the signal device sends a signal, the yellow indicator light illuminates, and the float valve quickly closes. When the pressure rises to 0.44 MPa, the distance from the oil level to the upper surface of the float valve is checked to be (45 ± 5) mm. As the oil level continues to rise until the signal device sends a signal, the red indicator light illuminates, and the distance from the oil level to the upper surface of the float valve is checked to be 15 mm. + 0 5 mm. However, the float valve is an irregularly shaped part and can only be fixed by the upper end face. Existing test methods can provide kerosene and oil tank with a clean pressure not exceeding 59 kPa. The kerosene pressure is adjustable and readable. At the same time, it can provide a circuit system to ensure the signal is on and off. However, it cannot accurately measure the distance from the oil surface to the upper surface of the float valve, nor can it check the distance from the oil surface to the upper surface of the float valve. Utility Model Content

[0003] In view of this, the present invention provides a special test fixture for aircraft float valves, which is used to perform functional tests on float valves after maintenance, thereby ensuring the quality of aircraft float valve maintenance and ensuring the continuity of the aircraft hydraulic system oil circuit.

[0004] The present invention adopts the following technical solution:

[0005] A special test fixture for aircraft float valves includes a float fixing plate 1, a support rod 2, a steel ruler 3, a base 4, a base plate 5, a viewing window 6, a level 7, and a gasket 8.

[0006] The float fixing plate 1 is provided with support rod fixing holes at the four corners, and a viewing window and float fixing hole in the middle. The viewing window is used to observe the oil circuit connection and disconnection. The float fixing hole is used to install the float valve to be tested through the float's own nut. A spirit level 7 is provided on the upper surface of the float fixing plate 1. The spirit level 7 is used to observe whether the float fixing plate 1 is level with the bottom of the oil tank.

[0007] The viewing window 6 is made of plexiglass and is fixedly installed at the viewing window of the float fixing plate 1 by screws.

[0008] The base plate 5 is provided with support rod threaded holes and base threaded holes at its four corners. The base plate 5 and the float fixing plate 1 are fixedly connected by four identical support rods 2 to form the support frame of the entire special test fixture.

[0009] The support rod 2 has threads at both ends. Its upper end passes through the support rod fixing hole of the float fixing plate 1 and is fastened by a hexagonal nut. Its lower end is threaded and fixed in the support rod thread hole of the base plate 5.

[0010] The foot 4 is threaded into the foot threaded hole at the bottom of the base plate 5. By turning the foot 4 and observing the level 7, the float fixing plate 1 and the base plate 5 are made parallel to the bottom surface of the oil tank.

[0011] The top of the steel ruler 3 is fixed to the side of the float fixing plate 1 and is used to measure the distance from the oil level to the upper plane of the float valve.

[0012] The gasket 8 is annular and is disposed between the float valve to be tested and the float fixing plate 1.

[0013] Furthermore, all components of the aforementioned special test fixture, except for the viewing window 6, are made of hard aluminum.

[0014] The beneficial effects of this utility model are:

[0015] This invention enables the smooth conduct of aircraft float valve function tests through mechanical operation, achieves accurate measurement of oil level changes, and ensures the stability of the test, thereby guaranteeing the maintenance quality of aircraft float valves.

[0016] (1) The float fixing plate is made of hard aluminum material. In order to meet the fixing needs of other parts, it is equipped with float fixing holes, viewing windows and support rod fixing holes.

[0017] (2) In order to better observe the oil circuit, a hole is made above the fixed plate and a viewing window is made of plexiglass. The viewing window is fastened to the fixed plate with screws.

[0018] (3) The feet are connected to the base plate by threads. Place the level ruler on the float fixing plate and adjust the feet threads to ensure that each plate is level with the bottom of the oil tank. Attached Figure Description

[0019] Figure 1 The following are renderings of the effect of this utility model, wherein (a) is the front view, (b) is the side view, and (c) is the top view;

[0020] Figure 2 This is a schematic diagram of the float fixing plate of this utility model, wherein (a) is the front view and (b) is the side view;

[0021] Figure 3 This is a schematic diagram of the base plate of this utility model, wherein (a) is the front view and (b) is the side view;

[0022] Figure 4 This is a schematic diagram of the support rod of this utility model;

[0023] Figure 5 This is a schematic diagram of the base of this utility model.

[0024] Among them, 1-float fixing plate; 2-support rod; 3-steel ruler; 4-base foot; 5-base plate; 6-viewing window; 7-level ruler; 8-shield. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below.

[0026] A special test fixture for aircraft float valves, such as Figure 1 It includes a float fixing plate 1, a support rod 2, a steel ruler 3, a base 4, a base plate 5, a viewing window 6, a spirit level 7, and a shim 8.

[0027] like Figure 2 The float fixing plate 1 is provided with support rod fixing holes at the four corners, and a viewing window and float fixing hole in the middle. The viewing window is used to observe the oil circuit connection and disconnection. The float fixing hole is used to install the float valve to be tested through the float's own nut. A level 7 is provided on the upper surface of the float fixing plate 1. The level 7 is used to observe whether the float fixing plate 1 is level with the bottom surface of the oil tank.

[0028] The viewing window 6 is made of plexiglass and is fixedly installed at the viewing window of the float fixing plate 1 by screws.

[0029] like Figure 3 The base plate 5 is provided with support rod threaded holes and base threaded holes at its four corners. The base plate 5 and the float fixing plate 1 are fixedly connected by four identical support rods 2 to form the support frame of the entire special test fixture.

[0030] like Figure 4 The support rod 2 has threads at both ends, with the upper thread longer than the lower thread. The upper end passes through the support rod fixing hole of the float fixing plate 1 and is then fastened by a hexagonal nut, while the lower thread is fixed in the support rod thread hole of the base plate 5.

[0031] like Figure 5 The foot 4 is threaded into the foot threaded hole at the bottom of the base plate 5. The surface of the foot 4 is knurled. By turning the foot 4 and observing the level 7, the float fixing plate 1 and the base plate 5 are made parallel to the bottom surface of the oil tank.

[0032] The top of the steel ruler 3 is fixed to the side of the float fixing plate 1 and is used to measure the distance from the oil level to the upper plane of the float valve.

[0033] The gasket 8 is ring-shaped and is placed between the float valve to be tested and the float fixing plate 1. When in use, the float valve passes through from below the float fixing plate 1, and then the gasket 8 is inserted from above.

[0034] Except for the viewing window 6, all other parts of the special test fixture are made of hard aluminum.

[0035] The process is as follows: Place the special test fixture in the existing oil tank in the factory, and use the existing hydraulic system and circuit system in the oil tank; after passing the float valve to be tested through the float fixing hole on the float fixing plate 1 from bottom to top, put the gasket 8 in from top, and complete the fixing installation by the float's own nut; turn the base 4 and observe the level 7 to adjust the float fixing plate 1 to be level; start the functional test, observe the oil circuit through the viewing window 6, and measure the oil level height through the steel ruler 3.

[0036] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A special test fixture for aircraft float valves, characterized in that, Includes float fixing plate (1), support rod (2), steel ruler (3), base plate (5), and viewing window (6); The float fixing plate (1) is provided with support rod fixing holes at the four corners, and a viewing window and float fixing hole in the middle. The viewing window is used to observe the oil circuit connection and the float fixing hole is used to install the float valve to be tested. The viewing window (6) is fixedly installed at the viewing window of the float fixing plate (1); The base plate (5) is provided with support rod threaded holes at the four corners. The base plate (5) and the float fixing plate (1) are fixedly connected by four identical support rods (2) to form the support frame of the entire special test fixture. The upper end of the support rod (2) is fixed to the float fixing plate (1), and the lower end is fixed to the bottom plate (5); The top of the steel ruler (3) is fixed to the side of the float fixing plate (1) for measuring the oil level.

2. The special test fixture for aircraft float valves according to claim 1, characterized in that, The viewing window (6) is made of plexiglass.

3. The special test fixture for aircraft float valves according to claim 1, characterized in that, The float fixing plate (1) is provided with a level (7) on its upper surface, and the bottom plate (5) is connected to four feet (4) by threads at the bottom corners. By turning the feet (4) and observing the level (7), the float fixing plate (1) can be adjusted to be level.

4. The special test fixture for aircraft float valves according to claim 1, characterized in that, An annular gasket (8) is provided between the float fixing plate (1) and the float valve to be tested.

5. A special test fixture for aircraft float valves according to any one of claims 1 to 4, characterized in that, Except for the viewing window (6), all other components are made of hard aluminum.

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