Gap measuring tool for attack angle sensor

Abstract

The utility model discloses a gap measuring tool for an angle of attack sensor, which comprises a supporting base body, the supporting base body is composed of a bottom plate, two cylindrical supporting columns vertically fixed on the bottom plate and an upper mounting plate in rigid connection with the tops of the supporting columns, and the bottom surface of the bottom plate is provided with an anti-skid rubber pad; the rapid positioning module comprises a positioning plate detachably mounted on the upper mounting plate, a dynamic measurement mechanism, a dynamometer sliding plate horizontally connected to the upper mounting plate in a sliding manner, and a digital dynamometer mounted on the dynamometer sliding plate through a dynamometer thread lifting device; and the shaft system coupling assembly is a dynamometer clamping lock fixed at the tail end of the gap checking shaft through a locking screw, and a dial indicator measuring head on the dial indicator bracket is vertically propped against a radial measuring plane of the gap checking shaft. According to the utility model, through a synchronous triggering mechanism of the digital dynamometer and the dial indicator, real-time correlation measurement of axial force loading and radial displacement is realized, phase delay errors are eliminated, and the measurement precision reaches + / -0.002 mm; the device is simple in structure and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model relates to civil aviation flight control system technical field especially relates to a gap measurement frock for angle of attack sensor. BACKGROUND

[0002] Civil aviation aircraft A320 series angle of attack sensor needs to be tested and fixed when testing to prevent the test deviation caused by vibration during testing, and the wind vane shaft in the middle of the sensor needs to be installed with a certain gap, otherwise the card stagnation and friction phenomenon will appear, in order to keep a certain gap to install the wind vane shaft, the angle of attack sensor needs to be tested and fixed, and the gap measurement tool is installed at the same time to achieve the purpose of gap measurement. Therefore, a complete test frock needs to be designed. UTILITY MODEL CONTENT

[0003] The utility model discloses a kind of gap measurement frock for angle of attack sensor, and the quick and accurate measurement of angle of attack sensor gap is realized by optimizing positioning structure and dynamic measurement mechanism, simultaneously integrated force feedback function is ensured Assembly process stress controllable to solve the foregoing problems existing in prior art.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0005] A kind of gap measurement frock for angle of attack sensor, comprising:

[0006] Support base, it is made of bottom plate, two cylindrical struts vertically fixed on bottom plate and the upper mounting plate rigidly connected with the top of strut, and bottom plate bottom surface is equipped with antiskid rubber pad;

[0007] Quick positioning module, including the positioning plate detachably installed on the upper mounting plate, the positioning plate is equipped with the stepped positioning hole matched with the flange plate of angle of attack sensor;

[0008] Dynamic measurement mechanism, including the dynamometer slide plate horizontally slidably connected on the upper mounting plate, digital dynamometer installed on the dynamometer slide plate by dynamometer threaded lifting device, and the micrometer stand fixed in the middle of strut;

[0009] Shaft coupling assembly, containing gap check shaft of interference sleeve joint in the end of angle of attack sensor wind vane shaft, dynamometer lock fixed in the end of gap check shaft by locking screw, wherein dynamometer lock is equipped with the semispherical contact groove coaxially aligned with digital dynamometer probe, and micrometer head on micrometer stand is vertically abutted on the radial measurement plane of gap check shaft.

[0010] In some specific embodiments, a linear guide pair is provided between the force gauge slide plate and the upper mounting plate. The guide pair includes two T-shaped guide rails arranged parallel to each other on the surface of the upper mounting plate, and a slider assembly with ball bearings embedded in the rails. The slider displacement direction forms an adjustable angle of 0-15° with the axis of the clearance inspection shaft.

[0011] In some specific embodiments, the end of the thread lifting device of the force gauge is provided with a fine adjustment knob with scale markings. The knob is connected to the digital force gauge through an elastic preload mechanism, and the preload adjustment range is 0.5-2 N·m.

[0012] In some specific embodiments, in the support base, the base plate and the support column, and the support column and the upper mounting plate are rigidly connected by M8×120 hexagon socket screws, and the axis of the support column is perpendicular to the plane of the base plate by ≤0.05mm.

[0013] In some specific embodiments, the dial indicator bracket is a rotatable clamp, with a dial indicator fixing seat with magnetic attraction at one end, and the end away from the dial indicator fixing seat is connected to the support column, with a rotation angle adjustment range of ±90°.

[0014] In some specific embodiments, the support column has a weight-reducing cavity inside, which is filled with polyurethane damping material, and the outer surface of the support column is hard anodized to form a wear-resistant layer with a thickness of 30±5μm.

[0015] In some specific embodiments, the force gauge lock is equipped with a replaceable contact head, which includes two configurations: a tungsten carbide hemispherical head and a ceramic flat head, and is connected to the gap inspection shaft via a magnetic quick-release interface.

[0016] The beneficial effects of this utility model are as follows: This utility model discloses a gap measurement fixture for an angle-of-attack sensor, including a support base consisting of a base plate, two cylindrical supports vertically fixed on the base plate, and an upper mounting plate rigidly connected to the top of the supports. The bottom surface of the base plate is provided with an anti-slip rubber pad. A quick positioning module includes a positioning plate detachably mounted on the upper mounting plate, which has stepped positioning holes that match the flange of the angle-of-attack sensor. A dynamic measurement mechanism includes a force gauge slide plate horizontally slidably connected to the upper mounting plate, a digital force gauge mounted on the force gauge slide plate via a force gauge thread lifting device, and a dial indicator bracket fixed in the middle of the supports. A shaft coupling assembly includes a gap inspection shaft interference-fitted to the end of the angle-of-attack sensor's wind vane shaft, and a force gauge lock fixed to the end of the gap inspection shaft by a locking screw. The force gauge lock has a hemispherical contact groove coaxially aligned with the digital force gauge probe, and the dial indicator probe on the dial indicator bracket is perpendicularly abutted against the radial measurement plane of the gap inspection shaft. This invention utilizes a synchronous triggering mechanism between a digital force gauge and a dial indicator to achieve real-time correlation measurement of axial force loading and radial displacement, eliminating phase delay errors and achieving a measurement accuracy of ±0.002mm. A detachable positioning plate is designed to support rapid switching between different sensor models. The design of the clearance inspection shaft, employing a 1:10 taper interference fit, automatically compensates for axial eccentricity caused by machining errors in the weathervane shaft, reducing manual adjustment time. This invention features a simple structure, convenient operation, and is conducive to production and widespread adoption. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a gap measurement fixture for an angle-of-attack sensor according to the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the clearance inspection shaft of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the force gauge slide plate of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the force gauge locking mechanism of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the thread lifting device for the force gauge of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the base plate of this utility model;

[0023] Figure 7 This is a schematic diagram of the positioning plate of this utility model;

[0024] Figure 8 This is a schematic diagram of the structure of the dial indicator bracket of this utility model;

[0025] Figure 9 This is a schematic diagram of the structure of the mounting plate of this utility model;

[0026] Figure 10 This is a schematic diagram of the upper support structure of this utility model;

[0027] In the attached diagram: 1. Angle of attack sensor; 2. Positioning plate; 3. Upper mounting plate; 4. Clearance inspection shaft; 5. Force gauge lock; 6. Dial gauge bracket; 7. Support column; 8. Dial gauge mounting base; 9. Force gauge threaded lifting device; 10. Digital force gauge; 11. Force gauge slide plate; 12. Dial gauge; 13. Base plate; 14. M8×120 socket head cap screw; 15. Slide rod; 16. Slide groove. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0029] Reference Figures 1 to 10 The fixture shown is for measuring the gap of an angle-of-attack sensor, comprising:

[0030] The supporting base consists of a base plate 13, two cylindrical support columns 7 vertically fixed on the base plate, and an upper mounting plate 3 rigidly connected to the top of the support columns. The bottom surface of the base plate 13 is provided with an anti-slip rubber pad.

[0031] The quick positioning module includes a positioning plate 2 that can be detachably mounted on the upper mounting plate 3. The positioning plate 2 has stepped positioning holes that match the flange of the angle of attack sensor 1.

[0032] The dynamic measuring mechanism includes a force gauge slide plate 11 that is horizontally slidably connected to the upper mounting plate 3, a digital force gauge 10 that is mounted on the force gauge slide plate 11 via a force gauge thread lifting device 9, and a dial indicator bracket 6 that is fixed in the middle of the support column 7.

[0033] The shaft coupling assembly includes a clearance check shaft 4 that is interference-fitted to the end of the angle of attack sensor wind vane shaft, and a force gauge lock 5 that is fixed to the end of the clearance check shaft 4 by a locking screw. The force gauge lock 5 is provided with a hemispherical contact groove that is coaxially aligned with the probe of the digital force gauge 10. The dial gauge 12 probe on the dial gauge bracket 6 is perpendicularly abutted against the radial measuring plane of the clearance check shaft 4.

[0034] In some specific embodiments, a linear guide pair is provided between the force gauge slide plate 11 and the upper mounting plate 3. The guide pair includes two T-shaped guide rails arranged parallel to each other on the surface of the upper mounting plate 3, and a slider assembly with ball bearings embedded in the rails. The slider displacement direction forms an adjustable angle of 0-15° with the axis of the clearance inspection shaft 4.

[0035] In some specific embodiments, the end of the thread lifting device 9 of the force gauge is provided with a fine adjustment knob with scale markings. The knob is connected to the digital force gauge 10 through an elastic pre-tightening mechanism, and the pre-tightening force adjustment range is 0.5-2 N·m.

[0036] In some specific embodiments, in the support base, the base plate 13 and the support column 7, and the support column 7 and the upper mounting plate 3 are rigidly connected by M8×120 hexagon socket screws 14, and the axis of the support column 7 is perpendicular to the plane of the base plate 13 by ≤0.05mm.

[0037] In some specific embodiments, the dial indicator bracket 6 is a rotatable clamp, with a dial indicator fixing seat 8 with magnetic attraction at one end, and the end away from the dial indicator fixing seat is connected to the support column 7, with a rotation angle adjustment range of ±90°.

[0038] In some specific embodiments, the support column 7 has a weight-reducing cavity inside, which is filled with polyurethane damping material, and the outer surface of the support column is hard anodized to form a wear-resistant layer with a thickness of 30±5μm.

[0039] In some specific embodiments, the force gauge lock 5 is equipped with a replaceable contact head, which includes two configurations: a tungsten carbide hemispherical head and a ceramic flat head. It is connected to the gap inspection shaft 4 through a magnetic quick-release interface.

[0040] In this embodiment, the positioning plate 2 is used to position the angle of attack sensor 1; the upper mounting plate 3 is used to fix the angle of attack sensor in conjunction with the positioning plate; the gap inspection shaft 4 is used to extend the wind vane shaft on the angle of attack sensor; the force gauge lock 5 is used to fix the force gauge pointer; the dial indicator bracket 6 is used to fix the position of the dial indicator; the support column 7 supports the entire fixture; the M8*120 hexagon socket screw 14 is used to move the force gauge thread lifting device; the force gauge thread lifting device is used to fix the digital force gauge 10; the digital force gauge 10 is used to measure the applied external force; the force gauge slide plate 11 is used to fix the force gauge lifting device and prevent it from changing direction; the dial indicator 12 is used to measure the gap movement range under the influence of external force; and the base plate 13 is used to stabilize the center of gravity and support the entire fixture.

[0041] Connection methods and assembly relationships of main components:

[0042] Connect the upper mounting plate 3, support column 7, and base plate 13 using M8×12 hex socket screws 14; fix the force gauge slide plate 11 by passing M3×10 flathead screws through the upper mounting plate 3; slide the slide rod 15 on the outside of the force gauge threaded lifting device 9 into the slide groove 16 of the force gauge slide plate 11, and then fix the force gauge threaded lifting device 9 by passing M8×120 screws through the upper mounting plate; install the angle of attack sensor on the upper mounting plate 3 through the positioning plate 2; install the gap inspection shaft 4 on the wind vane shaft of the angle of attack sensor 1; install the force gauge in the force gauge threaded lifting device 9; insert the force gauge pointer into the force gauge lock and fix the force gauge lock to the gap inspection shaft 4 with M3×10 flathead screws; install the M3×10 flathead screws and dial indicator lock on the support column 7; fix the dial indicator 12 with M3×10 flathead screws to ensure that the dial indicator is on the gap inspection shaft 4 and has moved a certain distance, thus completing the entire tooling assembly.

[0043] Functional analysis:

[0044] 1. An M8×120 screw, a force gauge slide plate, a force gauge thread lifting device, a force gauge slide plate, a force gauge, and a force gauge locking device constitute a set of devices for applying external force. When the operator rotates the M8×120 screw, the force gauge thread lifting device will move up and down on the force gauge slide plate, thereby driving the force gauge to move up and down. Since the other end of the force gauge locking device is fixed on the clearance inspection shaft, an external force is applied to that position, causing the clearance inspection shaft to drive the wind vane shaft to make a very small up and down displacement.

[0045] 2. A dial indicator and a dial indicator lock together form a gap measuring device. The dial indicator rests on the gap inspection shaft. Due to the external force mentioned above, the gap inspection shaft drives the wind vane shaft to make a very small up and down displacement, which causes the dial indicator to have a specific numerical change, thereby determining whether the gap value is within the required range.

[0046] How to use:

[0047] First, place the test fixture horizontally on the test platform, install the angle of attack sensor, and mount the clearance check shaft onto the anemometer shaft. This completes the angle of attack sensor assembly.

[0048] Test method:

[0049] When the M8×120 screw is rotated, the gap inspection shaft causes the weather vane shaft to move up and down very slightly. The change in the dial indicator value is then read to determine whether the gap value is within the required range.

[0050] Material selection:

[0051] The main material used is 6061 aluminum alloy. The selected material has good processing performance, high toughness, and can make objects move smoothly when used to make force gauge lifting devices and force gauge slides. It also has good corrosion resistance and is easier to preserve for a long time during use.

[0052] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0053] This invention utilizes a synchronous triggering mechanism between a digital force gauge and a dial indicator to achieve real-time correlation measurement of axial force loading and radial displacement, eliminating phase delay errors and achieving a measurement accuracy of ±0.002mm. A detachable positioning plate is designed to support rapid switching between different sensor models. The design of the clearance inspection shaft, employing a 1:10 taper interference fit, automatically compensates for axial eccentricity caused by machining errors in the weathervane shaft, reducing manual adjustment time. This invention features a simple structure, convenient operation, and is conducive to production and widespread adoption.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A gap measuring fixture for an angle-of-attack sensor, characterized in that, include: The supporting base consists of a base plate (13), two cylindrical support columns (7) vertically fixed on the base plate, and an upper mounting plate (3) rigidly connected to the top of the support columns. The bottom surface of the base plate (13) is provided with an anti-slip rubber pad. The quick positioning module includes a positioning plate (2) that can be detachably mounted on the upper mounting plate (3), the positioning plate (2) having stepped positioning holes that match the flange of the angle of attack sensor (1); The dynamic measuring mechanism includes a force gauge slide plate (11) that is horizontally slidably connected to the upper mounting plate (3), a digital force gauge (10) that is mounted on the force gauge slide plate (11) via a force gauge thread lifting device (9), and a dial indicator bracket (6) fixed in the middle of the support column (7). The shaft coupling assembly includes a clearance check shaft (4) that is interference-fitted to the end of the angle of attack sensor wind vane shaft, and a force gauge lock (5) that is fixed to the end of the clearance check shaft (4) by a locking screw. The force gauge lock (5) is provided with a hemispherical contact groove that is coaxially aligned with the probe of the digital force gauge (10). The dial gauge (12) probe on the dial gauge bracket (6) is perpendicularly abutted against the radial measuring plane of the clearance check shaft (4).

2. The gap measuring fixture according to claim 1, characterized in that, A linear guide pair is provided between the force gauge slide plate (11) and the upper mounting plate (3). The guide pair includes two T-shaped guide rails arranged parallel to each other on the surface of the upper mounting plate (3), and a slider assembly with ball bearings embedded in the rails. The slider displacement direction forms an adjustable angle of 0-15° with the axis of the clearance inspection shaft (4).

3. The gap measuring fixture according to claim 2, characterized in that, The end of the thread lifting device (9) of the force gauge is provided with a fine adjustment knob with scale markings. The knob is connected to the digital force gauge (10) through an elastic pre-tightening mechanism. The pre-tightening force adjustment range is 0.5-2 N·m.

4. The gap measuring fixture according to claim 1, characterized in that, In the supporting base, the base plate (13) and the support column (7) are rigidly connected by M8×120 hexagon socket screws (14), and the support column (7) and the upper mounting plate (3) are rigidly connected by M8×120 hexagon socket screws (14), and the axis of the support column (7) is perpendicular to the plane of the base plate (13) by ≤0.05mm.

5. The gap measuring fixture according to claim 1, characterized in that, The dial indicator bracket (6) is a rotatable clamp, with a dial indicator fixing seat (8) with magnetic attraction function at one end, and the end away from the dial indicator fixing seat is connected to the support column (7), with a rotation angle adjustment range of ±90°.

6. The gap measuring fixture according to any one of claims 1-5, characterized in that, The support column (7) has a weight-reducing cavity inside, which is filled with polyurethane damping material. The outer surface of the support column is hard anodized to form a wear-resistant layer with a thickness of 30±5μm.

7. The gap measuring fixture according to any one of claims 1-5, characterized in that, The force gauge lock (5) is equipped with a replaceable contact head, which includes two configurations: a tungsten steel hemispherical head and a ceramic flat head. It is connected to the gap inspection shaft (4) through a magnetic quick-release interface.

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