A device and method for detecting the length of a straight section of an aircraft duct

Abstract

The present invention relates to the technical field of aircraft duct detection, and specifically to a straight segment length measuring tool and detection method for aircraft ducts. The detection tool comprises a plurality of identical measuring pieces and rivets for tightening the measuring pieces; the measuring pieces have a certain thickness; the measuring pieces have no less than 2 semicircular grooves of fixed diameter; the measuring pieces are magnetic through a magnetization process. The present invention enables measurement personnel to measure the straight segment length of the duct between the root of the duct bushing and the duct bend by overlapping and accumulating a plurality of measuring pieces and rotating 360 degrees to check whether they are completely fitted. The straight segment length is equal to the thickness of a plurality of measuring pieces. The measuring tool is low-cost and easy to carry, and the measuring method is simple and easy to repeat. At the same time, the present invention has the function of measuring the size of the gap between two bonding surfaces.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft duct detection, in particular to a straight line segment length measuring tool and a detection method for aircraft ducts. Background Art

[0002] Aircraft ducts need to ensure a certain straight section length in order to reduce the hydraulic shock of the tube body and reduce the wear of the tube body and the bushing. At present, the detection of the straight section length of the duct is mainly qualitatively detected by manual visual inspection. This method cannot be quantitatively analyzed due to the lack of specific detection tools and has certain quality risks. Chinese patent CN109141176A provides a detection device and detection method for the straight section length of aircraft ducts. This method uses a detection tool to insert the bell mouth of the duct before the duct is assembled to obtain a quantitative length of the straight section of the duct. After the duct is assembled, two clamping blocks with a length of m are used to obtain a qualitative judgment of whether the straight section of the duct is greater than m. This method can obtain a quantitative length of the straight section of the duct before the duct is assembled. After assembly, because the bell mouth has been closed because the duct is in a connected state, the detection tool cannot be inserted again. At this time, only the qualitative length of the straight section of the duct can be obtained, and the quantitative length of the straight section of the duct after assembly cannot be obtained. At the same time, the present invention has the function of measuring the gap size between two joint surfaces like a feeler gauge, while other similar inventions do not have this function. Summary of the invention

[0003] In order to solve the above problem, the present invention provides a device and method for detecting the length of a straight section of an aircraft duct.

[0004] A tool for detecting the length of a straight line segment comprises a plurality of identical measuring pieces and rivets for fastening the measuring pieces; the measuring pieces have a uniform specific thickness; the measuring pieces have no less than two semicircular grooves of fixed diameters; and the measuring pieces have magnetism through a magnetization process.

[0005] Furthermore, the measuring piece has three semicircular grooves with fixed diameters, and the three semicircular grooves are located on different sides of the measuring piece.

[0006] A detection method for a multifunctional straight section length detection device for an aircraft duct, the steps are as follows:

[0007] S1 placement: According to the diameter of the catheter to be measured, place the semicircular grooves of corresponding diameters on multiple measuring pieces at the root of the catheter bushing. The measuring pieces automatically fit together because they are magnetic after being magnetized.

[0008] S2 Rotation: Rotate the multiple measurement pieces in step S1 360° around the bushing root of the catheter.

[0009] S3 inspection: Check whether the measuring piece can completely fit the catheter during 360° rotation.

[0010] S4 adjustment: when the result of step S3 is complete fit, proceed to the next step S5; when the result of step S3 is incomplete fit, add or subtract a measuring piece, and then return to step S2 until the result is complete fit.

[0011] S5 calculation: If the result of step S3 is complete fit, the thickness of multiple measuring pieces is calculated. As a result, n measuring pieces are used, and the thickness of each measuring piece is x mm. Then the thickness of the n measuring pieces is nx mm, that is, the straight section length of the catheter is nx mm.

[0012] When the selected measuring piece is three semicircular grooves, the calculation is performed as follows:

[0013] 5.1 Set the measurement model of measurement piece 2 as:

[0014] X={(a,b,c)}

[0015] a, b, and c are three semicircle measuring points from near to far from the circular hole measuring point;

[0016] 5.2 Taking the detection of a catheter at measuring point a as an example, the single-point single-chip measurement model is:

[0017] X a ={(a)}=k a f s h

[0018] Among them, X a is a single-point single-piece thickness measurement model, k a The single-piece thickness coefficient is set to 0.95-1.05 to take into account the manufacturing error, f s To measure the friction coefficient of the catheter, h is the thickness of the single sheet;

[0019] 5.3 According to the single-point single-piece measurement model, the final measurement thickness model of this single point is:

[0020]

[0021] Among them, H a is the single-point final measurement thickness model of point a, and n is the actual number of measured slices;

[0022] 5.4 Similarly, the final measured thickness model for measurement points b and c is as follows:

[0023]

[0024]

[0025] The beneficial effects of the present invention are:

[0026] The present invention enables measurement personnel to measure the length of the straight section of the catheter between the root of the catheter bushing and the catheter bend by overlapping and accumulating multiple measuring pieces and rotating 360 degrees to check whether they are completely fitted. The length of the straight section is equal to the thickness of multiple measuring pieces. The measuring tool is low-cost and easy to carry. The measuring method is simple and easy to repeat. At the same time, the present invention has the function of measuring the size of the gap between two bonding surfaces. According to statistics, the cumulative economic losses caused by failures due to insufficient straight sections of the catheter in recent years have reached 150,000. The use of the present invention can effectively reduce the economic losses caused by failures due to insufficient straight sections of the catheter, thereby achieving higher economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the measuring piece of the present invention.

[0029] In the figure: 1 rivet; 2 measuring piece. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be further described below in conjunction with specific embodiments and drawings.

[0031] Embodiment 1:

[0032] A detection method for a multifunctional straight section length detection device for an aircraft duct, characterized in that the steps are as follows:

[0033] S1 placement: according to the diameter of the catheter to be measured, a plurality of semicircular grooves of corresponding diameters on the measuring pieces 2 are placed at the root of the catheter bushing. The measuring pieces 2 are automatically attached to each other because they are magnetic after being magnetized.

[0034] S2 Rotation: Rotate the plurality of measurement pieces 2 in step S1 360° around the bushing root of the catheter.

[0035] S3 inspection: Check whether the measuring piece 2 can completely fit the catheter during the 360° rotation.

[0036] S4 adjustment: when the result of step S3 is complete fit, proceed to the next step S5; when the result of step S3 is incomplete fit, add or subtract a measuring piece 2, and then return to step S2 until the result is complete fit.

[0037] S5 calculation: If the result of step S3 is complete fit, the thickness of multiple measuring pieces is calculated. The result is that n measuring pieces 2 are used, and the thickness of each measuring piece 2 is x mm. Then the thickness of n measuring pieces 2 is nx mm, that is, the straight section length of the catheter is nx mm.

[0038] When the selected measuring piece 2 is three semicircular grooves, the calculation is specifically performed in the following manner:

[0039] 5.1 Set the measurement model of measurement piece 2 as:

[0040] X={(a,b,c)}

[0041] a, b, and c are three semicircle measuring points from near to far from the circular hole measuring point;

[0042] 5.2 Taking the detection of a catheter at measuring point a as an example, the single-point single-chip measurement model is:

[0043] X a ={(a)}=k a f s h

[0044] Among them, X a is a single-point single-piece thickness measurement model, k a The single-piece thickness coefficient is set to 0.95-1.05 to take into account the manufacturing error, f s To measure the friction coefficient of the catheter, h is the thickness of the single sheet;

[0045] 5.3 According to the single-point single-piece measurement model, the final measurement thickness model of this single point is:

[0046]

[0047] Among them, H a is the single-point final measurement thickness model of point a, and n is the actual number of measured slices;

[0048] 5.4 Similarly, the final measured thickness model for measurement points b and c is as follows:

[0049]

[0050]

[0051] Embodiment 2:

[0052] A tool for detecting the length of a straight line segment, comprising a plurality of identical measuring pieces 2 and a rivet 1 for fastening the measuring pieces 2; the measuring pieces 2 have a certain thickness; the measuring pieces 2 are magnetic through a magnetization process. The measuring pieces 2 have three semicircular grooves of fixed diameter, and the three semicircular grooves are located on different sides of the measuring piece 2.

Claims

1. A detection method for a multifunctional straight section length detection device for an aircraft duct, characterized in that: Here are the steps: S1 placement: according to the diameter of the catheter to be measured, a plurality of semicircular grooves of corresponding diameters on the measuring pieces (2) are placed at the root of the catheter bushing, and the measuring pieces (2) are automatically attached to each other because they have magnetic properties after being magnetized; S2: rotating: rotating the plurality of measuring pieces (2) in step S1 by 360° around the base of the sleeve of the catheter; S3: checking: checking whether the measuring pieces (2) are completely fitted to the catheter during the 360° rotation; S4 adjustment: when the result of step S3 is complete fit, proceed to the next step S5; when the result of step S3 is incomplete fit, add or subtract a measuring piece (2), and then return to step S2 until the result is complete fit; S5 calculation: If the result of step S3 is complete fit, the thickness of multiple measuring pieces is calculated. For the measuring piece (2) with three semicircular grooves, the calculation is performed in the following manner: 5.1 Set the measurement model of the measurement piece (2) as: X={(a,b,c)} a, b, and c are three semicircle measuring points from near to far from the circular hole measuring point; 5.2 Taking the detection of a catheter at measuring point a as an example, the single-point single-chip measurement model is: X a ={(a)}=k a f s h Among them, X a is a single-point single-piece thickness measurement model, k a f is the single-piece thickness factor set to take into account manufacturing errors, s To measure the friction coefficient of the catheter, h is the thickness of the single sheet; 5.3 According to the single-point single-piece measurement model, the final measurement thickness model of this single point is: Among them, H a is the single-point final measurement thickness model of point a, and n is the actual number of measured slices; 5.4 Similarly, the final measurement thickness model for measurement points b and c is as follows:

2. The detection method of the multifunctional straight section length detection device for aircraft duct according to claim 1, characterized in that: In the step 5.2, the single sheet thickness coefficient is 0.95 to 1.

05.

3. The detection method of the multifunctional straight section length detection device for aircraft duct according to claim 1, characterized in that: The straight segment length detection tool comprises a plurality of identical measuring pieces (2) and rivets (1) for fastening the measuring pieces (2); the measuring pieces (2) have a uniform specific thickness; the measuring pieces (2) have three semicircular grooves of fixed diameter, and the three semicircular grooves are located on different sides of the measuring piece (2); and the measuring piece (2) has magnetism through a magnetization process.

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