Off-axis degree detection tool

Abstract

The off-axis degree detection tool provided by the utility model comprises a measuring plate and a scale, and the first end of the measuring plate is movably connected with the head end of the scale through a connecting assembly; a C-shaped notch is formed in the outer side edge, away from the ruler, of the measuring plate; the outer side edge part between the first end of the measuring plate and the C-shaped notch is a detection surface, and the outer side edge part between the second end of the measuring plate and the C-shaped notch is a binding surface; the C-shaped notch is used for being aligned with the boss of the end, and the attaching face is used for being attached to the cylindrical part of the end. The connecting assembly adjusts the tightness of the scale and the measuring plate, so that the end part of the scale is attached to one to-be-detected plane in the plane part; the scale is used for measuring the size of a gap between the plane to be detected and the measuring plate so as to determine the off-axis degree. According to the off-axis degree detection tool, sensitive and tiny bending conditions can be detected, the detection result is quantified, and the dependence on the experience of a detector is reduced; a binding surface and a detection surface are designed for the appearance of the synchronizing shaft end, and the method is suitable for the complex appearance of the synchronizing shaft end.

Description

Technical Field

[0001] The utility model belongs to the field of detection technology, and in particular relates to an eccentricity detection tool. Background Art

[0002] The thrust reverse synchronizing shaft is a component of civil aircraft engines. Each engine has two synchronizing shafts with the same part number, one installed between the left and right reverse thrust actuators. After the aircraft lands and during reverse thrust, the thrust reverse synchronizing shaft assists the actuators, synchronizing the left and right reverse thrust sliding doors. This ensures consistent reverse thrust on both sides of the engine, preventing reverse thrust failures, engine stalls, and even runway excursions during reverse roll due to unsynchronized thrust door activation.

[0003] The engine reverse thrust synchronization shaft consists of a flexible shaft and an end head, and the flexible shaft is made of wound steel wire.

[0004] During passenger aircraft operation, the thrust reverser synchronizing shaft has been found to suffer damage such as broken flexible shaft wire, wear, and excessive clearance. This damage can lead to failures such as engine reverser locking, slow engine reverser deployment, ground engine stalls, and runway deviations. An engineering investigation determined that this damage is caused by deformation and bending of the synchronizing shaft end, resulting in misalignment between the end and the flexible shaft. This results in additional centrifugal force during reverse thrust actuation, excessive shaft curvature, and abrasion against the synchronizing tube.

[0005] According to engineering surveys, more than 70% of the bending of synchronous shaft ends is slight, with an offset of only about 1 mm. Figure 1 This is a schematic diagram of the bending of the synchronous shaft end provided by the present invention. Figure 1 As shown, under normal circumstances, the axis of the end of the synchronous shaft is a straight line, but after the synchronous shaft is damaged, that is, under abnormal circumstances, the axis of the synchronous shaft is a curved curve.

[0006] Currently, synchronous axis misalignment is primarily detected visually. However, visual inspection is difficult to identify deviations at the millimeter level, making it prone to missed or false detections. Furthermore, detection accuracy is highly dependent on factors such as the inspector's vision, experience, and lighting conditions. Furthermore, the results are highly subjective and lack numerical quantification.

[0007] In addition, since the end of the synchronous shaft includes concentric shapes of different diameters such as cylindrical surfaces, square planes, and bosses, the end shape is complex, and there is currently no effective auxiliary detection tool for the eccentricity of the synchronous shaft. Utility Model Content

[0008] The utility model provides an eccentricity detection tool, which can at least solve some problems existing in the prior art.

[0009] To achieve the above-mentioned objectives, the present application adopts the following technical solutions: a tool for detecting eccentricity of an end head of an engine thrust reverse synchronization shaft, wherein the end head of the engine thrust reverse synchronization shaft comprises a cylindrical portion and a planar portion, wherein the cylindrical portion is a cylinder, and the planar portion is a cuboid extending along the length direction; the bottom surface of the cylinder and the cuboid are connected by a plane consisting of a width and a height, the diameter of the bottom surface of the cylinder is greater than the width and height of the cuboid, and a boss is provided at the connection between the cylinder and the cuboid;

[0010] The detection tool comprises:

[0011] A measuring plate and a ruler, wherein the first end of the measuring plate is movably connected to the head end of the ruler via a connecting assembly; the ruler is provided with scales;

[0012] The measuring plate includes two side edges, wherein a C-shaped notch is provided on the outer side of the measuring plate away from the scale; the outer side edge portion between the first end of the measuring plate and the C-shaped notch is a detection surface, and the outer side edge portion between the second end of the measuring plate and the C-shaped notch is a fitting surface;

[0013] When detecting the eccentricity of the end head, the C-shaped notch is used to align with the boss of the end head, and the fitting surface is used to fit with the cylindrical portion of the end head; the connecting assembly is used to adjust the tightness of the scale and the measuring plate when the fitting surface fits with the cylindrical portion, so that the end of the scale fits with one of the planes to be tested in the plane portion;

[0014] The ruler is used to measure the gap size between the plane to be detected and the measuring plate, so as to determine the eccentricity of the plane to be detected according to the gap size.

[0015] Optionally, the connecting assembly is a screw and a nut, and the first end of the measuring plate and the head end of the ruler are respectively provided with holes matching the diameter of the screw;

[0016] The screw is connected to the nut through the hole, so that the first end of the measuring plate is movably connected to the head end of the scale. The tightness of the movably connected between the scale and the measuring plate can be adjusted by rotating the nut.

[0017] Optionally, the diameter of the screw head is larger than the outer diameter of the nut, and the diameter of the screw body is smaller than the outer diameter of the nut.

[0018] Optionally, the hole on the measuring plate is a first hole, the hole on the ruler is a second hole, and the screw rod passes through the first hole and the second hole in sequence and is connected to the nut.

[0019] Optionally, the first hole is circular and the second hole is elliptical; the major axis of the second hole is located in the length direction of the ruler and the minor axis is located in the width direction of the ruler; the diameter of the circle is the same as the minor axis length of the ellipse, the diameter of the circle is the same as the outer diameter of the nut, and the major axis length is greater than the diameter of the screw.

[0020] Optionally, when the gap size is equal to a preset first threshold, the eccentricity of the plane to be detected is 0; the first threshold is the difference between the base radius of the cylinder and half the length of the target side; the target side is the side of the cuboid perpendicular to the plane to be detected.

[0021] Optionally, when the gap size is greater than the first threshold, the end tip bends to the left of the end tip center axis, and when the gap size is less than the first threshold, the end tip bends to the right of the end tip center axis; the eccentricity of the plane to be detected is the difference between the gap size and the first threshold.

[0022] Optionally, the measuring plate and the scale are made of aluminum alloy.

[0023] The beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0024] The utility model provides an eccentricity detection tool comprising: a measuring plate and a ruler, wherein the first end of the measuring plate is movably connected to the head end of the ruler via a connecting assembly; a C-shaped notch is provided on the outer side of the measuring plate away from the ruler; the outer side portion between the first end of the measuring plate and the C-shaped notch serves as a detection surface, and the outer side portion between the second end of the measuring plate and the C-shaped notch serves as a fitting surface; the C-shaped notch is used to align with the boss of the end head, and the fitting surface is used to fit with the cylindrical portion of the end head; the connecting assembly adjusts the tightness of the ruler and the measuring plate so that the end of the ruler fits with a plane to be detected in the planar portion; the ruler is used to measure the gap size between the plane to be detected and the measuring plate to determine the eccentricity. The eccentricity detection tool can detect sensitive and subtle bending conditions, quantify the detection results, and reduce reliance on the tester's experience; the fitting surface and detection surface are designed based on the shape of the synchronous shaft end head, and are suitable for complex shapes of synchronous shaft end heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the bending of the end of the synchronous shaft provided by the present invention;

[0026] Figure 2 A mechanical structure diagram of the eccentricity detection tool provided by the utility model;

[0027] Figure 3 A cross-sectional view of the end of the reverse thrust synchronization shaft of the engine provided by the present invention;

[0028] Figure 4 This is a cross-sectional view of an eccentricity detection tool provided by the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] Figure 2 This is a mechanical structure diagram of the eccentricity detection tool provided by the utility model.

[0031] like Figure 2 As shown, the eccentricity detection tool includes:

[0032] A measuring plate 1 and a ruler 2, wherein a first end 3 of the measuring plate 1 is movably connected to a head end 5 of the ruler 2 via a connecting assembly 4; and a scale is provided on the ruler 2.

[0033] The measuring plate 1 and the scale 2 are movably connected. When the tightness of the connecting component 4 is tightened, the measuring plate 1 and the scale 2 cannot rotate around the end points. When the tightness of the connecting component 4 is loosened, the measuring plate 1 and the scale 2 can rotate around the end points, so that the angle between the measuring plate 1 and the scale 2 changes.

[0034] The measuring plate 1 includes two sides: an inner side close to the scale 2 and an outer side away from the scale 2. A C-shaped notch 7 is provided on the outer side of the measuring plate 1. The two sides of the C-shaped notch 7 are the measuring plate's detection surface 8 and fitting surface 9, respectively.

[0035] Specifically, the outer edge between the first end 3 of the measuring plate 1 and the C-shaped notch 7 is the detection surface 8, and the outer edge between the second end of the measuring plate 1 and the C-shaped notch 7 is the fitting surface 9. The detection surface 8 and the fitting surface 9 are the main working surfaces during measurement.

[0036] The inspection tool is made of 2024-T3 aluminum alloy and is machined according to the drawings without any special surface treatment. Aluminum alloy has a low density, light weight, and excellent ductility, making the inspection tool lighter and easier to manufacture.

[0037] Figure 3 This is a cross-sectional view of the engine reverse thrust synchronization shaft end provided by the utility model.

[0038] like Figure 3 As shown, the engine reverse thrust synchronization shaft end includes: a cylindrical portion 10 and a flat portion 11.

[0039] Among them, the cylindrical part 10 is a cylinder, and the planar part 11 is a cuboid extending along the length direction; the bottom surface of the cylinder and the cuboid are connected by a plane composed of width and height, the diameter of the cylinder is larger than the width and height of the cuboid, and a boss 12 is provided at the connection between the cylinder and the cuboid.

[0040] Specifically, Figure 2 The eccentricity detection tool in Figure 3 The engine reverse thrust synchronous shaft end is tested for eccentricity.

[0041] When detecting the eccentricity of the end head, the C-shaped notch is used to align with the boss of the end head, and the fitting surface is used to fit with the cylindrical portion of the end head; the connecting assembly is used to adjust the tightness of the ruler and the measuring plate when the fitting surface fits with the cylindrical portion, so that the end of the ruler fits with one of the planes to be detected in the plane portion.

[0042] The ruler is used to measure the gap size between the surface to be inspected and the measuring plate, so as to determine the eccentricity of the surface to be inspected based on the gap size. The gap size can be read on the ruler.

[0043] Because the base diameter of the cylinder is larger than the width and height of the cuboid, when the measuring plate's mating surface is aligned with the cylindrical portion, the gap between the measuring plate's detection surface and the planar portion normally reaches the first threshold. The first threshold is the difference between the cylinder's base radius and half the length of the target side, where the target side is the side of the cuboid perpendicular to the plane to be inspected.

[0044] The eccentricity of the plane to be inspected is the difference between the gap size and a first threshold. When the gap size is equal to the first threshold, the eccentricity of the plane to be inspected is 0, indicating that the tip is not bent. When the gap size is greater than or less than the first threshold, it indicates that the tip is bent.

[0045] At the same time, when the gap size is greater than the first threshold, it indicates that the end tip is bent to the left of the end tip center axis, and when the gap size is less than the first threshold, it indicates that the end tip is bent to the right of the end tip center axis.

[0046] Exemplarily, the first threshold is 2. When the gap size is 2, the gap size is equal to the first threshold, and the end tip is not bent; when the gap size is 3, the gap size is greater than the first threshold, indicating that the end tip is bent to the left of the central axis.

[0047] The planar portion of the end is a rectangular parallelepiped, including four faces. Each face can be used as a plane to be detected for gap size detection. Each plane to be detected is detected at least once, and the average value of multiple detections for each plane to be detected is taken as the final gap size measurement result of the detection plane.

[0048] Then, save the inspection photo of the plane to be inspected with the largest end bending as the final inspection result to provide a reference for subsequent maintenance work.

[0049] In a possible embodiment, the connecting component 4 is a screw 13 and a nut 14, and the first end 3 of the measuring plate 1 and the head end 5 of the scale 2 are respectively provided with holes matching the diameter of the screw 13;

[0050] The screw 13 is connected to the nut 14 through the hole, so that the first end 3 of the measuring plate 1 is movably connected to the head end 5 of the scale 2. The tightness of the movably connected scale 2 and the measuring plate 1 can be adjusted by rotating the nut 14.

[0051] Figure 4 This is a cross-sectional view of an eccentricity detection tool provided by the utility model.

[0052] like Figure 4 As shown, the screw rod 13 is connected to the nut 14 through a hole, so that the first end of the measuring plate 1 is movably connected to the head end of the scale 2.

[0053] In a possible implementation, the hole on the measuring plate 1 is a first hole, the hole on the scale 2 is a second hole, and the screw 13 passes through the first hole and the second hole in sequence and is connected to the nut 14 .

[0054] like Figure 4 As shown, screw 13 sequentially passes through the first hole in measuring plate 1 and the second hole in ruler 2, and is connected to nut 14. This allows the tip of ruler 2 to be displayed on the top of measuring plate 1, making the scale of ruler 2 intuitively visible. During measurement, the scale scale is intuitively displayed above the measuring ruler, making it convenient for the user to read the scale on ruler 2.

[0055] In one possible embodiment, the first hole is circular and the second hole is elliptical; the major axis of the second hole is located in the length direction of the ruler and the minor axis is located in the width direction of the ruler; the diameter of the circle is the same as the minor axis length of the ellipse, the diameter of the circle is the same as the outer diameter of the nut, and the major axis length is greater than the diameter of the screw.

[0056] Specifically, to facilitate the movement of the end of scale 2 to align with the surface to be inspected when rotating nut 13 to adjust the tightness of the connection between scale 2 and measuring plate 1, the hole in scale 2 for screw 13 is designed to be elliptical. To better secure screw 13 in the hole, the hole in measuring plate 1 is designed to be circular, with a diameter equal to the minor axis of the ellipse. The diameter of the circle is also the same length as the outer diameter of nut 14.

[0057] Since the scale 2 is located horizontally and the measuring plate 1 is located vertically during measurement, the second hole is designed to be an ellipse with the major axis distributed in the width direction of the measuring plate 1 and the minor axis distributed in the length direction of the measuring plate 1 .

[0058] like Figure 2 As shown, it can be found that the hole on the ruler 2 is elliptical, and the hole on the measuring plate 1 is blocked and not shown.

[0059] In a possible implementation manner, the diameter of the head end of the screw 13 is larger than the outer diameter of the nut 14 , and the diameter of the body of the screw 13 is smaller than the outer diameter of the nut 14 .

[0060] The head end diameter of the screw 13 is larger than the outer diameter of the nut 14, which makes it easier to screw the nut 14 into the screw 13. The rod diameter of the screw 13 is smaller than the outer diameter of the nut 14, which makes it possible for the rod of the screw 13 to be embedded in the nut 14, thereby realizing a movable connection between the measuring plate 1 and the scale 2.

[0061] In summary, the utility model provides a tool for detecting eccentricity, which is used for detecting eccentricity of the end head of the reverse thrust synchronous shaft of the engine. The tool comprises: a measuring plate and a ruler, wherein the first end of the measuring plate is movably connected to the head end of the ruler through a connecting assembly; the ruler is provided with a scale; the measuring plate comprises two side edges, wherein the outer edge of the measuring plate away from the ruler is provided with a C-shaped notch; the outer edge portion between the first end of the measuring plate and the C-shaped notch is a detection surface, and the outer edge portion between the second end of the measuring plate and the C-shaped notch is a detection surface. The outer edge portion is a fitting surface; when detecting the eccentricity of the end head, the C-shaped notch is used to align with the boss of the end head, and the fitting surface is used to fit with the cylindrical portion of the end head; the connecting assembly is used to adjust the tightness of the ruler and the measuring plate when the fitting surface fits with the cylindrical portion, so that the end of the ruler fits with one of the planes to be detected in the plane portion; the ruler is used to measure the gap size between the plane to be detected and the measuring plate, so as to determine the eccentricity of the plane to be detected based on the gap size.

[0062] Compared with the prior art of visually detecting the eccentricity of the end head, the eccentricity detection tool of the present invention has the following advantages: 1) It can detect sensitive and tiny bending situations, solving the problem that it is difficult to identify the millimeter bending of the synchronous shaft end head during visual inspection; 2) The gap size can be directly read out to calculate the eccentricity and quantify the inspection results, which is more intuitive and accurate; 3) The fitting surface and detection surface are specially designed for the shape of the synchronous shaft end head, so that the detection tool is suitable for the complex shape of the synchronous shaft end head including the cylindrical part and the flat part; 4) Each plane of the synchronous shaft end head can be inspected separately, and the bending direction can be comprehensively judged according to the inspection results of each plane; 5) The detection tool quantifies the detection results, thereby reducing the dependence on the experience of the detector; 6) The detection results measured with a ruler are intuitively visible, which is convenient for audio and video archiving, and more accurately records the inspection conditions and the eccentricity of the synchronous shaft.

[0063] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the concept of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the appended claims.

Claims

1. A tool for detecting eccentricity of an end of an engine thrust reverser synchronization shaft, the end of the engine thrust reverser synchronization shaft comprising a cylindrical portion and a planar portion, wherein the cylindrical portion is a cylinder and the planar portion is a cuboid extending in the longitudinal direction; the bottom surface of the cylinder and the cuboid are connected by a plane consisting of the width and height, the bottom surface diameter of the cylinder being larger than the width and height of the cuboid, and a boss being provided at the connection between the cylinder and the cuboid; It is characterized by: The detection tool comprises: A measuring plate and a ruler, wherein the first end of the measuring plate is movably connected to the head end of the ruler via a connecting assembly; the ruler is provided with scales; The measuring plate includes two side edges, wherein a C-shaped notch is provided on the outer side of the measuring plate away from the scale; the outer side edge portion between the first end of the measuring plate and the C-shaped notch is a detection surface, and the outer side edge portion between the second end of the measuring plate and the C-shaped notch is a fitting surface; When detecting the eccentricity of the end head, the C-shaped notch is used to align with the boss of the end head, and the fitting surface is used to fit with the cylindrical portion of the end head; the connecting assembly is used to adjust the tightness of the scale and the measuring plate when the fitting surface fits with the cylindrical portion, so that the end of the scale fits with one of the planes to be tested in the plane portion; The ruler is used to measure the gap size between the plane to be detected and the measuring plate, so as to determine the eccentricity of the plane to be detected according to the gap size.

2. The detection tool according to claim 1, characterized in that: The connecting assembly is a screw and a nut, and the first end of the measuring plate and the head end of the ruler are respectively provided with holes matching the diameter of the screw; The screw is connected to the nut through the hole, so that the first end of the measuring plate is movably connected to the head end of the scale. The tightness of the movably connected between the scale and the measuring plate can be adjusted by rotating the nut.

3. The detection tool according to claim 2, characterized in that The diameter of the screw head end is larger than the outer diameter of the nut, and the diameter of the screw body is smaller than the outer diameter of the nut.

4. The detection tool according to claim 2, characterized in that: The hole on the measuring plate is a first hole, the hole on the ruler is a second hole, and the screw rod passes through the first hole and the second hole in sequence and is connected to the nut.

5. The detection tool according to claim 4, characterized in that: The first hole is circular and the second hole is elliptical; the major axis of the second hole is located in the length direction of the ruler and the minor axis is located in the width direction of the ruler; the diameter of the circle is the same as the minor axis length of the ellipse, the diameter of the circle is the same as the outer diameter of the nut, and the major axis length is greater than the diameter of the screw.

6. The detection tool according to claim 1, characterized in that: When the gap size is equal to a preset first threshold, the eccentricity of the plane to be detected is 0; the first threshold is the difference between the base radius of the cylinder and half the length of the target side; the target side is the side of the cuboid that is perpendicular to the plane to be detected.

7. The detection tool according to claim 6, characterized in that: When the gap size is greater than the first threshold, the end tip bends to the left of the end tip's central axis; when the gap size is less than the first threshold, the end tip bends to the right of the end tip's central axis; the eccentricity of the plane to be detected is the difference between the gap size and the first threshold.

8. The detection tool according to claim 1, characterized in that: The measuring plate and the scale are made of aluminum alloy.

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